Release 4.10 fs/btrfs/extent-tree.c

Directory: fs/btrfs
/*
 * Copyright (C) 2007 Oracle.  All rights reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public
 * License v2 as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public
 * License along with this program; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 021110-1307, USA.
 */
#include <linux/sched.h>
#include <linux/pagemap.h>
#include <linux/writeback.h>
#include <linux/blkdev.h>
#include <linux/sort.h>
#include <linux/rcupdate.h>
#include <linux/kthread.h>
#include <linux/slab.h>
#include <linux/ratelimit.h>
#include <linux/percpu_counter.h>
#include "hash.h"
#include "tree-log.h"
#include "disk-io.h"
#include "print-tree.h"
#include "volumes.h"
#include "raid56.h"
#include "locking.h"
#include "free-space-cache.h"
#include "free-space-tree.h"
#include "math.h"
#include "sysfs.h"
#include "qgroup.h"


#undef SCRAMBLE_DELAYED_REFS

/*
 * control flags for do_chunk_alloc's force field
 * CHUNK_ALLOC_NO_FORCE means to only allocate a chunk
 * if we really need one.
 *
 * CHUNK_ALLOC_LIMITED means to only try and allocate one
 * if we have very few chunks already allocated.  This is
 * used as part of the clustering code to help make sure
 * we have a good pool of storage to cluster in, without
 * filling the FS with empty chunks
 *
 * CHUNK_ALLOC_FORCE means it must try to allocate one
 *
 */
enum {
	
CHUNK_ALLOC_NO_FORCE = 0,
	
CHUNK_ALLOC_LIMITED = 1,
	
CHUNK_ALLOC_FORCE = 2,
};

static int update_block_group(struct btrfs_trans_handle *trans,
			      struct btrfs_fs_info *fs_info, u64 bytenr,
			      u64 num_bytes, int alloc);
static int __btrfs_free_extent(struct btrfs_trans_handle *trans,
			       struct btrfs_fs_info *fs_info,
				struct btrfs_delayed_ref_node *node, u64 parent,
				u64 root_objectid, u64 owner_objectid,
				u64 owner_offset, int refs_to_drop,
				struct btrfs_delayed_extent_op *extra_op);
static void __run_delayed_extent_op(struct btrfs_delayed_extent_op *extent_op,
				    struct extent_buffer *leaf,
				    struct btrfs_extent_item *ei);
static int alloc_reserved_file_extent(struct btrfs_trans_handle *trans,
				      struct btrfs_fs_info *fs_info,
				      u64 parent, u64 root_objectid,
				      u64 flags, u64 owner, u64 offset,
				      struct btrfs_key *ins, int ref_mod);
static int alloc_reserved_tree_block(struct btrfs_trans_handle *trans,
				     struct btrfs_fs_info *fs_info,
				     u64 parent, u64 root_objectid,
				     u64 flags, struct btrfs_disk_key *key,
				     int level, struct btrfs_key *ins);
static int do_chunk_alloc(struct btrfs_trans_handle *trans,
			  struct btrfs_fs_info *fs_info, u64 flags,
			  int force);
static int find_next_key(struct btrfs_path *path, int level,
			 struct btrfs_key *key);
static void dump_space_info(struct btrfs_fs_info *fs_info,
			    struct btrfs_space_info *info, u64 bytes,
			    int dump_block_groups);
static int btrfs_add_reserved_bytes(struct btrfs_block_group_cache *cache,
				    u64 ram_bytes, u64 num_bytes, int delalloc);
static int btrfs_free_reserved_bytes(struct btrfs_block_group_cache *cache,
				     u64 num_bytes, int delalloc);
static int block_rsv_use_bytes(struct btrfs_block_rsv *block_rsv,
			       u64 num_bytes);
static int __reserve_metadata_bytes(struct btrfs_root *root,
				    struct btrfs_space_info *space_info,
				    u64 orig_bytes,
				    enum btrfs_reserve_flush_enum flush);
static void space_info_add_new_bytes(struct btrfs_fs_info *fs_info,
				     struct btrfs_space_info *space_info,
				     u64 num_bytes);
static void space_info_add_old_bytes(struct btrfs_fs_info *fs_info,
				     struct btrfs_space_info *space_info,
				     u64 num_bytes);


static noinline int

block_group_cache_done(struct btrfs_block_group_cache *cache)
{
	smp_mb();
	return cache->cached == BTRFS_CACHE_FINISHED ||
		cache->cached == BTRFS_CACHE_ERROR;
}

Contributors
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josef bacik josef bacik 28 100.00% 2 100.00%
Total 28 100.00% 2 100.00%



static int block_group_bits(struct btrfs_block_group_cache *cache, u64 bits)
{
	return (cache->flags & bits) == bits;
}

Contributors
Person Tokens Prop Commits CommitProp
josef bacik josef bacik 20 80.00% 1 33.33%
chris mason chris mason 5 20.00% 2 66.67%
Total 25 100.00% 3 100.00%



void btrfs_get_block_group(struct btrfs_block_group_cache *cache)
{
	atomic_inc(&cache->count);
}

Contributors
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josef bacik josef bacik 18 100.00% 1 100.00%
Total 18 100.00% 1 100.00%



void btrfs_put_block_group(struct btrfs_block_group_cache *cache)
{
	if (atomic_dec_and_test(&cache->count)) {
		WARN_ON(cache->pinned > 0);
		WARN_ON(cache->reserved > 0);
		kfree(cache->free_space_ctl);
		kfree(cache);
	}
}

Contributors
Person Tokens Prop Commits CommitProp
josef bacik josef bacik 25 48.08% 1 33.33%
zheng yan zheng yan 20 38.46% 1 33.33%
li zefan li zefan 7 13.46% 1 33.33%
Total 52 100.00% 3 100.00%

/*
 * this adds the block group to the fs_info rb tree for the block group
 * cache
 */


static int btrfs_add_block_group_cache(struct btrfs_fs_info *info,
				struct btrfs_block_group_cache *block_group)
{
	struct rb_node **p;
	struct rb_node *parent = NULL;
	struct btrfs_block_group_cache *cache;

	spin_lock(&info->block_group_cache_lock);
	p = &info->block_group_cache_tree.rb_node;

	while (*p) {
		parent = *p;
		cache = rb_entry(parent, struct btrfs_block_group_cache,
				 cache_node);
		if (block_group->key.objectid < cache->key.objectid) {
			p = &(*p)->rb_left;
		} else if (block_group->key.objectid > cache->key.objectid) {
			p = &(*p)->rb_right;
		} else {
			spin_unlock(&info->block_group_cache_lock);
			return -EEXIST;
		}
	}

	rb_link_node(&block_group->cache_node, parent, p);
	rb_insert_color(&block_group->cache_node,
			&info->block_group_cache_tree);

	if (info->first_logical_byte > block_group->key.objectid)
		info->first_logical_byte = block_group->key.objectid;

	spin_unlock(&info->block_group_cache_lock);

	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
josef bacik josef bacik 112 55.72% 1 10.00%
chris mason chris mason 54 26.87% 5 50.00%
liu bo liu bo 22 10.95% 1 10.00%
yan zheng yan zheng 12 5.97% 2 20.00%
christoph hellwig christoph hellwig 1 0.50% 1 10.00%
Total 201 100.00% 10 100.00%

/*
 * This will return the block group at or after bytenr if contains is 0, else
 * it will return the block group that contains the bytenr
 */

static struct btrfs_block_group_cache *

block_group_cache_tree_search(struct btrfs_fs_info *info, u64 bytenr,
			      int contains)
{
	struct btrfs_block_group_cache *cache, *ret = NULL;
	struct rb_node *n;
	u64 end, start;

	spin_lock(&info->block_group_cache_lock);
	n = info->block_group_cache_tree.rb_node;

	while (n) {
		cache = rb_entry(n, struct btrfs_block_group_cache,
				 cache_node);
		end = cache->key.objectid + cache->key.offset - 1;
		start = cache->key.objectid;

		if (bytenr < start) {
			if (!contains && (!ret || start < ret->key.objectid))
				ret = cache;
			n = n->rb_left;
		} else if (bytenr > start) {
			if (contains && bytenr <= end) {
				ret = cache;
				break;
			}
			n = n->rb_right;
		} else {
			ret = cache;
			break;
		}
	}
	if (ret) {
		btrfs_get_block_group(ret);
		if (bytenr == 0 && info->first_logical_byte > ret->key.objectid)
			info->first_logical_byte = ret->key.objectid;
	}
	spin_unlock(&info->block_group_cache_lock);

	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
josef bacik josef bacik 128 58.45% 3 27.27%
chris mason chris mason 52 23.74% 5 45.45%
liu bo liu bo 28 12.79% 1 9.09%
zheng yan zheng yan 8 3.65% 1 9.09%
yan zheng yan zheng 3 1.37% 1 9.09%
Total 219 100.00% 11 100.00%



static int add_excluded_extent(struct btrfs_fs_info *fs_info,
			       u64 start, u64 num_bytes)
{
	u64 end = start + num_bytes - 1;
	set_extent_bits(&fs_info->freed_extents[0],
			start, end, EXTENT_UPTODATE);
	set_extent_bits(&fs_info->freed_extents[1],
			start, end, EXTENT_UPTODATE);
	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
zheng yan zheng yan 34 53.97% 1 20.00%
chris mason chris mason 15 23.81% 1 20.00%
josef bacik josef bacik 12 19.05% 2 40.00%
jeff mahoney jeff mahoney 2 3.17% 1 20.00%
Total 63 100.00% 5 100.00%



static void free_excluded_extents(struct btrfs_fs_info *fs_info,
				  struct btrfs_block_group_cache *cache)
{
	u64 start, end;

	start = cache->key.objectid;
	end = start + cache->key.offset - 1;

	clear_extent_bits(&fs_info->freed_extents[0],
			  start, end, EXTENT_UPTODATE);
	clear_extent_bits(&fs_info->freed_extents[1],
			  start, end, EXTENT_UPTODATE);
}

Contributors
Person Tokens Prop Commits CommitProp
zheng yan zheng yan 67 89.33% 1 20.00%
josef bacik josef bacik 5 6.67% 2 40.00%
jeff mahoney jeff mahoney 2 2.67% 1 20.00%
chris mason chris mason 1 1.33% 1 20.00%
Total 75 100.00% 5 100.00%



static int exclude_super_stripes(struct btrfs_fs_info *fs_info,
				 struct btrfs_block_group_cache *cache)
{
	u64 bytenr;
	u64 *logical;
	int stripe_len;
	int i, nr, ret;

	if (cache->key.objectid < BTRFS_SUPER_INFO_OFFSET) {
		stripe_len = BTRFS_SUPER_INFO_OFFSET - cache->key.objectid;
		cache->bytes_super += stripe_len;
		ret = add_excluded_extent(fs_info, cache->key.objectid,
					  stripe_len);
		if (ret)
			return ret;
	}

	for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) {
		bytenr = btrfs_sb_offset(i);
		ret = btrfs_rmap_block(fs_info, cache->key.objectid,
				       bytenr, 0, &logical, &nr, &stripe_len);
		if (ret)
			return ret;

		while (nr--) {
			u64 start, len;

			if (logical[nr] > cache->key.objectid +
			    cache->key.offset)
				continue;

			if (logical[nr] + stripe_len <= cache->key.objectid)
				continue;

			start = logical[nr];
			if (start < cache->key.objectid) {
				start = cache->key.objectid;
				len = (logical[nr] + stripe_len) - start;
			} else {
				len = min_t(u64, stripe_len,
					    cache->key.objectid +
					    cache->key.offset - start);
			}

			cache->bytes_super += len;
			ret = add_excluded_extent(fs_info, start, len);
			if (ret) {
				kfree(logical);
				return ret;
			}
		}

		kfree(logical);
	}
	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
zheng yan zheng yan 148 50.86% 3 37.50%
josef bacik josef bacik 139 47.77% 4 50.00%
jeff mahoney jeff mahoney 4 1.37% 1 12.50%
Total 291 100.00% 8 100.00%


static struct btrfs_caching_control *

get_caching_control(struct btrfs_block_group_cache *cache)
{
	struct btrfs_caching_control *ctl;

	spin_lock(&cache->lock);
	if (!cache->caching_ctl) {
		spin_unlock(&cache->lock);
		return NULL;
	}

	ctl = cache->caching_ctl;
	atomic_inc(&ctl->count);
	spin_unlock(&cache->lock);
	return ctl;
}

Contributors
Person Tokens Prop Commits CommitProp
zheng yan zheng yan 55 77.46% 1 50.00%
josef bacik josef bacik 16 22.54% 1 50.00%
Total 71 100.00% 2 100.00%



static void put_caching_control(struct btrfs_caching_control *ctl)
{
	if (atomic_dec_and_test(&ctl->count))
		kfree(ctl);
}

Contributors
Person Tokens Prop Commits CommitProp
zheng yan zheng yan 26 100.00% 1 100.00%
Total 26 100.00% 1 100.00%

#ifdef CONFIG_BTRFS_DEBUG


static void fragment_free_space(struct btrfs_block_group_cache *block_group)
{
	struct btrfs_fs_info *fs_info = block_group->fs_info;
	u64 start = block_group->key.objectid;
	u64 len = block_group->key.offset;
	u64 chunk = block_group->flags & BTRFS_BLOCK_GROUP_METADATA ?
		fs_info->nodesize : fs_info->sectorsize;
	u64 step = chunk << 1;

	while (len > chunk) {
		btrfs_remove_free_space(block_group, start, chunk);
		start += step;
		if (len < step)
			len = 0;
		else
			len -= step;
	}
}
Contributors
Person Tokens Prop Commits CommitProp
josef bacik josef bacik 85 86.73% 1 25.00%
jeff mahoney jeff mahoney 13 13.27% 3 75.00%
Total 98 100.00% 4 100.00%

#endif

/*
 * this is only called by cache_block_group, since we could have freed extents
 * we need to check the pinned_extents for any extents that can't be used yet
 * since their free space will be released as soon as the transaction commits.
 */


u64 add_new_free_space(struct btrfs_block_group_cache *block_group,
		       struct btrfs_fs_info *info, u64 start, u64 end)
{
	u64 extent_start, extent_end, size, total_added = 0;
	int ret;

	while (start < end) {
		ret = find_first_extent_bit(info->pinned_extents, start,
					    &extent_start, &extent_end,
					    EXTENT_DIRTY | EXTENT_UPTODATE,
					    NULL);
		if (ret)
			break;

		if (extent_start <= start) {
			start = extent_end + 1;
		} else if (extent_start > start && extent_start < end) {
			size = extent_start - start;
			total_added += size;
			ret = btrfs_add_free_space(block_group, start,
						   size);
			BUG_ON(ret); /* -ENOMEM or logic error */
			start = extent_end + 1;
		} else {
			break;
		}
	}

	if (start < end) {
		size = end - start;
		total_added += size;
		ret = btrfs_add_free_space(block_group, start, size);
		BUG_ON(ret); /* -ENOMEM or logic error */
	}

	return total_added;
}

Contributors
Person Tokens Prop Commits CommitProp
josef bacik josef bacik 161 93.06% 3 37.50%
chris mason chris mason 8 4.62% 2 25.00%
jeff mahoney jeff mahoney 2 1.16% 1 12.50%
zheng yan zheng yan 2 1.16% 2 25.00%
Total 173 100.00% 8 100.00%



static int load_extent_tree_free(struct btrfs_caching_control *caching_ctl)
{
	struct btrfs_block_group_cache *block_group = caching_ctl->block_group;
	struct btrfs_fs_info *fs_info = block_group->fs_info;
	struct btrfs_root *extent_root = fs_info->extent_root;
	struct btrfs_path *path;
	struct extent_buffer *leaf;
	struct btrfs_key key;
	u64 total_found = 0;
	u64 last = 0;
	u32 nritems;
	int ret;
	bool wakeup = true;

	path = btrfs_alloc_path();
	if (!path)
		return -ENOMEM;

	last = max_t(u64, block_group->key.objectid, BTRFS_SUPER_INFO_OFFSET);

#ifdef CONFIG_BTRFS_DEBUG
	/*
         * If we're fragmenting we don't want to make anybody think we can
         * allocate from this block group until we've had a chance to fragment
         * the free space.
         */
	if (btrfs_should_fragment_free_space(block_group))
		wakeup = false;
#endif
	/*
         * We don't want to deadlock with somebody trying to allocate a new
         * extent for the extent root while also trying to search the extent
         * root to add free space.  So we skip locking and search the commit
         * root, since its read-only
         */
	path->skip_locking = 1;
	path->search_commit_root = 1;
	path->reada = READA_FORWARD;

	key.objectid = last;
	key.offset = 0;
	key.type = BTRFS_EXTENT_ITEM_KEY;

next:
	ret = btrfs_search_slot(NULL, extent_root, &key, path, 0, 0);
	if (ret < 0)
		goto out;

	leaf = path->nodes[0];
	nritems = btrfs_header_nritems(leaf);

	while (1) {
		if (btrfs_fs_closing(fs_info) > 1) {
			last = (u64)-1;
			break;
		}

		if (path->slots[0] < nritems) {
			btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
		} else {
			ret = find_next_key(path, 0, &key);
			if (ret)
				break;

			if (need_resched() ||
			    rwsem_is_contended(&fs_info->commit_root_sem)) {
				if (wakeup)
					caching_ctl->progress = last;
				btrfs_release_path(path);
				up_read(&fs_info->commit_root_sem);
				mutex_unlock(&caching_ctl->mutex);
				cond_resched();
				mutex_lock(&caching_ctl->mutex);
				down_read(&fs_info->commit_root_sem);
				goto next;
			}

			ret = btrfs_next_leaf(extent_root, path);
			if (ret < 0)
				goto out;
			if (ret)
				break;
			leaf = path->nodes[0];
			nritems = btrfs_header_nritems(leaf);
			continue;
		}

		if (key.objectid < last) {
			key.objectid = last;
			key.offset = 0;
			key.type = BTRFS_EXTENT_ITEM_KEY;

			if (wakeup)
				caching_ctl->progress = last;
			btrfs_release_path(path);
			goto next;
		}

		if (key.objectid < block_group->key.objectid) {
			path->slots[0]++;
			continue;
		}

		if (key.objectid >= block_group->key.objectid +
		    block_group->key.offset)
			break;

		if (key.type == BTRFS_EXTENT_ITEM_KEY ||
		    key.type == BTRFS_METADATA_ITEM_KEY) {
			total_found += add_new_free_space(block_group,
							  fs_info, last,
							  key.objectid);
			if (key.type == BTRFS_METADATA_ITEM_KEY)
				last = key.objectid +
					fs_info->nodesize;
			else
				last = key.objectid + key.offset;

			if (total_found > CACHING_CTL_WAKE_UP) {
				total_found = 0;
				if (wakeup)
					wake_up(&caching_ctl->wait);
			}
		}
		path->slots[0]++;
	}
	ret = 0;

	total_found += add_new_free_space(block_group, fs_info, last,
					  block_group->key.objectid +
					  block_group->key.offset);
	caching_ctl->progress = (u64)-1;

out:
	btrfs_free_path(path);
	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
josef bacik josef bacik 350 57.38% 9 40.91%
zheng yan zheng yan 134 21.97% 4 18.18%
liu bo liu bo 44 7.21% 1 4.55%
omar sandoval omar sandoval 36 5.90% 1 4.55%
chris mason chris mason 29 4.75% 3 13.64%
jeff mahoney jeff mahoney 12 1.97% 1 4.55%
david sterba david sterba 5 0.82% 3 13.64%
Total 610 100.00% 22 100.00%



static noinline void caching_thread(struct btrfs_work *work)
{
	struct btrfs_block_group_cache *block_group;
	struct btrfs_fs_info *fs_info;
	struct btrfs_caching_control *caching_ctl;
	struct btrfs_root *extent_root;
	int ret;

	caching_ctl = container_of(work, struct btrfs_caching_control, work);
	block_group = caching_ctl->block_group;
	fs_info = block_group->fs_info;
	extent_root = fs_info->extent_root;

	mutex_lock(&caching_ctl->mutex);
	down_read(&fs_info->commit_root_sem);

	if (btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE))
		ret = load_free_space_tree(caching_ctl);
	else
		ret = load_extent_tree_free(caching_ctl);

	spin_lock(&block_group->lock);
	block_group->caching_ctl = NULL;
	block_group->cached = ret ? BTRFS_CACHE_ERROR : BTRFS_CACHE_FINISHED;
	spin_unlock(&block_group->lock);

#ifdef CONFIG_BTRFS_DEBUG
	if (btrfs_should_fragment_free_space(block_group)) {
		u64 bytes_used;

		spin_lock(&block_group->space_info->lock);
		spin_lock(&block_group->lock);
		bytes_used = block_group->key.offset -
			btrfs_block_group_used(&block_group->item);
		block_group->space_info->bytes_used += bytes_used >> 1;
		spin_unlock(&block_group->lock);
		spin_unlock(&block_group->space_info->lock);
		fragment_free_space(block_group);
	}
#endif

	caching_ctl->progress = (u64)-1;

	up_read(&fs_info->commit_root_sem);
	free_excluded_extents(fs_info, block_group);
	mutex_unlock(&caching_ctl->mutex);

	wake_up(&caching_ctl->wait);

	put_caching_control(caching_ctl);
	btrfs_put_block_group(block_group);
}

Contributors
Person Tokens Prop Commits CommitProp
josef bacik josef bacik 151 55.51% 7 58.33%
omar sandoval omar sandoval 73 26.84% 2 16.67%
zheng yan zheng yan 37 13.60% 2 16.67%
chris mason chris mason 11 4.04% 1 8.33%
Total 272 100.00% 12 100.00%



static int cache_block_group(struct btrfs_block_group_cache *cache,
			     int load_cache_only)
{
	DEFINE_WAIT(wait);
	struct btrfs_fs_info *fs_info = cache->fs_info;
	struct btrfs_caching_control *caching_ctl;
	int ret = 0;

	caching_ctl = kzalloc(sizeof(*caching_ctl), GFP_NOFS);
	if (!caching_ctl)
		return -ENOMEM;

	INIT_LIST_HEAD(&caching_ctl->list);
	mutex_init(&caching_ctl->mutex);
	init_waitqueue_head(&caching_ctl->wait);
	caching_ctl->block_group = cache;
	caching_ctl->progress = cache->key.objectid;
	atomic_set(&caching_ctl->count, 1);
	btrfs_init_work(&caching_ctl->work, btrfs_cache_helper,
			caching_thread, NULL, NULL);

	spin_lock(&cache->lock);
	/*
         * This should be a rare occasion, but this could happen I think in the
         * case where one thread starts to load the space cache info, and then
         * some other thread starts a transaction commit which tries to do an
         * allocation while the other thread is still loading the space cache
         * info.  The previous loop should have kept us from choosing this block
         * group, but if we've moved to the state where we will wait on caching
         * block groups we need to first check if we're doing a fast load here,
         * so we can wait for it to finish, otherwise we could end up allocating
         * from a block group who's cache gets evicted for one reason or
         * another.
         */
	while (cache->cached == BTRFS_CACHE_FAST) {
		struct btrfs_caching_control *ctl;

		ctl = cache->caching_ctl;
		atomic_inc(&ctl->count);
		prepare_to_wait(&ctl->wait, &wait, TASK_UNINTERRUPTIBLE);
		spin_unlock(&cache->lock);

		schedule();

		finish_wait(&ctl->wait, &wait);
		put_caching_control(ctl);
		spin_lock(&cache->lock);
	}

	if (cache->cached != BTRFS_CACHE_NO) {
		spin_unlock(&cache->lock);
		kfree(caching_ctl);
		return 0;
	}
	WARN_ON(cache->caching_ctl);
	cache->caching_ctl = caching_ctl;
	cache->cached = BTRFS_CACHE_FAST;
	spin_unlock(&cache->lock);

	if (fs_info->mount_opt & BTRFS_MOUNT_SPACE_CACHE) {
		mutex_lock(&caching_ctl->mutex);
		ret = load_free_space_cache(fs_info, cache);

		spin_lock(&cache->lock);
		if (ret == 1) {
			cache->caching_ctl = NULL;
			cache->cached = BTRFS_CACHE_FINISHED;
			cache->last_byte_to_unpin = (u64)-1;
			caching_ctl->progress = (u64)-1;
		} else {
			if (load_cache_only) {
				cache->caching_ctl = NULL;
				cache->cached = BTRFS_CACHE_NO;
			} else {
				cache->cached = BTRFS_CACHE_STARTED;
				cache->has_caching_ctl = 1;
			}
		}
		spin_unlock(&cache->lock);
#ifdef CONFIG_BTRFS_DEBUG
		if (ret == 1 &&
		    btrfs_should_fragment_free_space(cache)) {
			u64 bytes_used;

			spin_lock(&cache->space_info->lock);
			spin_lock(&cache->lock);
			bytes_used = cache->key.offset -
				btrfs_block_group_used(&cache->item);
			cache->space_info->bytes_used += bytes_used >> 1;
			spin_unlock(&cache->lock);
			spin_unlock(&cache->space_info->lock);
			fragment_free_space(cache);
		}
#endif
		mutex_unlock(&caching_ctl->mutex);

		wake_up(&caching_ctl->wait);
		if (ret == 1) {
			put_caching_control(caching_ctl);
			free_excluded_extents(fs_info, cache);
			return 0;
		}
	} else {
		/*
                 * We're either using the free space tree or no caching at all.
                 * Set cached to the appropriate value and wakeup any waiters.
                 */
		spin_lock(&cache->lock);
		if (load_cache_only) {
			cache->caching_ctl = NULL;
			cache->cached = BTRFS_CACHE_NO;
		} else {
			cache->cached = BTRFS_CACHE_STARTED;
			cache->has_caching_ctl = 1;
		}
		spin_unlock(&cache->lock);
		wake_up(&caching_ctl->wait);
	}

	if (load_cache_only) {
		put_caching_control(caching_ctl);
		return 0;
	}

	down_write(&fs_info->commit_root_sem);
	atomic_inc(&caching_ctl->count);
	list_add_tail(&caching_ctl->list, &fs_info->caching_block_groups);
	up_write(&fs_info->commit_root_sem);

	btrfs_get_block_group(cache);

	btrfs_queue_work(fs_info->caching_workers, &caching_ctl->work);

	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
josef bacik josef bacik 545 84.76% 13 65.00%
zheng yan zheng yan 63 9.80% 1 5.00%
filipe david borba manana filipe david borba manana 12 1.87% 1 5.00%
qu wenruo qu wenruo 10 1.56% 1 5.00%
jeff mahoney jeff mahoney 7 1.09% 1 5.00%
chris mason chris mason 3 0.47% 1 5.00%
liu bo liu bo 2 0.31% 1 5.00%
omar sandoval omar sandoval 1 0.16% 1 5.00%
Total 643 100.00% 20 100.00%

/*
 * return the block group that starts at or after bytenr
 */

static struct btrfs_block_group_cache *

btrfs_lookup_first_block_group(struct btrfs_fs_info *info, u64 bytenr)
{
	return block_group_cache_tree_search(info, bytenr, 0);
}

Contributors
Person Tokens Prop Commits CommitProp
josef bacik josef bacik 22 84.62% 1 25.00%
chris mason chris mason 2 7.69% 1 25.00%
masahiro yamada masahiro yamada 1 3.85% 1 25.00%
christoph hellwig christoph hellwig 1 3.85% 1 25.00%
Total 26 100.00% 4 100.00%

/*
 * return the block group that contains the given bytenr
 */


struct btrfs_block_group_cache *btrfs_lookup_block_group(
						 struct btrfs_fs_info *info,
						 u64 bytenr)
{
	return block_group_cache_tree_search(info, bytenr, 1);
}

Contributors
Person Tokens Prop Commits CommitProp
josef bacik josef bacik 18 72.00% 1 25.00%
chris mason chris mason 6 24.00% 2 50.00%
masahiro yamada masahiro yamada 1 4.00% 1 25.00%
Total 25 100.00% 4 100.00%



static struct btrfs_space_info *__find_space_info(struct btrfs_fs_info *info,
						  u64 flags)
{
	struct list_head *head = &info->space_info;
	struct btrfs_space_info *found;

	flags &= BTRFS_BLOCK_GROUP_TYPE_MASK;

	rcu_read_lock();
	list_for_each_entry_rcu(found, head, list) {
		if (found->flags & flags) {
			rcu_read_unlock();
			return found;
		}
	}
	rcu_read_unlock();
	return NULL;
}

Contributors
Person Tokens Prop Commits CommitProp
chris mason chris mason 36 51.43% 8 57.14%
josef bacik josef bacik 27 38.57% 3 21.43%
qinghuang feng qinghuang feng 3 4.29% 1 7.14%
zheng yan zheng yan 3 4.29% 1 7.14%
ilya dryomov ilya dryomov 1 1.43% 1 7.14%
Total 70 100.00% 14 100.00%

/*
 * after adding space to the filesystem, we need to clear the full flags
 * on all the space infos.
 */


void btrfs_clear_space_info_full(struct btrfs_fs_info *info)
{
	struct list_head *head = &info->space_info;
	struct btrfs_space_info *found;

	rcu_read_lock();
	list_for_each_entry_rcu(found, head, list)
		found->full = 0;
	rcu_read_unlock();
}

Contributors
Person Tokens Prop Commits CommitProp
chris mason chris mason 45 100.00% 1 100.00%
Total 45 100.00% 1 100.00%

/* simple helper to search for an existing data extent at a given offset */


int btrfs_lookup_data_extent(struct btrfs_fs_info *fs_info, u64 start, u64 len)
{
	int ret;
	struct btrfs_key key;
	struct btrfs_path *path;

	path = btrfs_alloc_path();
	if (!path)
		return -ENOMEM;

	key.objectid = start;
	key.offset = len;
	key.type = BTRFS_EXTENT_ITEM_KEY;
	ret = btrfs_search_slot(NULL, fs_info->extent_root, &key, path, 0, 0);
	btrfs_free_path(path);
	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
chris mason chris mason 58 65.91% 1 16.67%
zheng yan zheng yan 17 19.32% 1 16.67%
mark fasheh mark fasheh 7 7.95% 1 16.67%
josef bacik josef bacik 3 3.41% 1 16.67%
jeff mahoney jeff mahoney 2 2.27% 1 16.67%
filipe david borba manana filipe david borba manana 1 1.14% 1 16.67%
Total 88 100.00% 6 100.00%

/*
 * helper function to lookup reference count and flags of a tree block.
 *
 * the head node for delayed ref is used to store the sum of all the
 * reference count modifications queued up in the rbtree. the head
 * node may also store the extent flags to set. This way you can check
 * to see what the reference count and extent flags would be if all of
 * the delayed refs are not processed.
 */


int btrfs_lookup_extent_info(struct btrfs_trans_handle *trans,
			     struct btrfs_fs_info *fs_info, u64 bytenr,
			     u64 offset, int metadata, u64 *refs, u64 *flags)
{
	struct btrfs_delayed_ref_head *head;
	struct btrfs_delayed_ref_root *delayed_refs;
	struct btrfs_path *path;
	struct btrfs_extent_item *ei;
	struct extent_buffer *leaf;
	struct btrfs_key key;
	u32 item_size;
	u64 num_refs;
	u64 extent_flags;
	int ret;

	/*
         * If we don't have skinny metadata, don't bother doing anything
         * different
         */
	if (metadata && !btrfs_fs_incompat(fs_info, SKINNY_METADATA)) {
		offset = fs_info->nodesize;
		metadata = 0;
	}

	path = btrfs_alloc_path();
	if (!path)
		return -ENOMEM;

	if (!trans) {
		path->skip_locking = 1;
		path->search_commit_root = 1;
	}

search_again:
	key.objectid = bytenr;
	key.offset = offset;
	if (metadata)
		key.type = BTRFS_METADATA_ITEM_KEY;
	else
		key.type = BTRFS_EXTENT_ITEM_KEY;

	ret = btrfs_search_slot(trans, fs_info->extent_root, &key, path, 0, 0);
	if (ret < 0)
		goto out_free;

	if (ret > 0 && metadata && key.type == BTRFS_METADATA_ITEM_KEY) {
		if (path->slots[0]) {
			path->slots[0]--;
			btrfs_item_key_to_cpu(path->nodes[0], &key,
					      path->slots[0]);
			if (key.objectid == bytenr &&
			    key.type == BTRFS_EXTENT_ITEM_KEY &&
			    key.offset == fs_info->nodesize)
				ret = 0;
		}
	}

	if (ret == 0) {
		leaf = path->nodes[0];
		item_size = btrfs_item_size_nr(leaf, path->slots[0]);
		if (item_size >= sizeof(*ei)) {
			ei = btrfs_item_ptr(leaf, path->slots[0],
					    struct btrfs_extent_item);
			num_refs = btrfs_extent_refs(leaf, ei);
			extent_flags = btrfs_extent_flags(leaf, ei);
		} else {
#ifdef BTRFS_COMPAT_EXTENT_TREE_V0
			struct btrfs_extent_item_v0 *ei0;
			BUG_ON(item_size != sizeof(*ei0));
			ei0 = btrfs_item_ptr(leaf, path->slots[0],
					     struct btrfs_extent_item_v0);
			num_refs = btrfs_extent_refs_v0(leaf, ei0);
			/* FIXME: this isn't correct for data */
			extent_flags = BTRFS_BLOCK_FLAG_FULL_BACKREF;
#else
			BUG();
#endif
		}
		BUG_ON(num_refs == 0);
	} else {
		num_refs = 0;
		extent_flags = 0;
		ret = 0;
	}

	if (!trans)
		goto out;

	delayed_refs = &trans->transaction->delayed_refs;
	spin_lock(&delayed_refs->lock);
	head = btrfs_find_delayed_ref_head(trans, bytenr);
	if (head) {
		if (!mutex_trylock(&head->mutex)) {
			atomic_inc(&head->node.refs);
			spin_unlock(&delayed_refs->lock);

			btrfs_release_path(path);

			/*
                         * Mutex was contended, block until it's released and try
                         * again
                         */
			mutex_lock(&head->mutex);
			mutex_unlock(&head->mutex);
			btrfs_put_delayed_ref(&head->node);
			goto search_again;
		}
		spin_lock(&head->lock);
		if (head->extent_op && head->extent_op->update_flags)
			extent_flags |= head->extent_op->flags_to_set;
		else
			BUG_ON(num_refs == 0);

		num_refs += head->node.ref_mod;
		spin_unlock(&head->lock);
		mutex_unlock(&head->mutex);
	}
	spin_unlock(&delayed_refs->lock);
out:
	WARN_ON(num_refs == 0);
	if (refs)
		*refs = num_refs;
	if (flags)
		*flags = extent_flags;
out_free:
	btrfs_free_path(path);
	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
zheng yan zheng yan 368 57.41% 4 23.53%
chris mason chris mason 95 14.82% 4 23.53%
filipe david borba manana filipe david borba manana 86 13.42% 2 11.76%
josef bacik josef bacik 83 12.95% 3 17.65%
jeff mahoney jeff mahoney 6 0.94% 2 11.76%
david sterba david sterba 3 0.47% 2 11.76%
Total 641 100.00% 17 100.00%

/*
 * Back reference rules.  Back refs have three main goals:
 *
 * 1) differentiate between all holders of references to an extent so that
 *    when a reference is dropped we can make sure it was a valid reference
 *    before freeing the extent.
 *
 * 2) Provide enough information to quickly find the holders of an extent
 *    if we notice a given block is corrupted or bad.
 *
 * 3) Make it easy to migrate blocks for FS shrinking or storage pool
 *    maintenance.  This is actually the same as #2, but with a slightly
 *    different use case.
 *
 * There are two kinds of back refs. The implicit back refs is optimized
 * for pointers in non-shared tree blocks. For a given pointer in a block,
 * back refs of this kind provide information about the block's owner tree
 * and the pointer's key. These information allow us to find the block by
 * b-tree searching. The full back refs is for pointers in tree blocks not
 * referenced by their owner trees. The location of tree block is recorded
 * in the back refs. Actually the full back refs is generic, and can be
 * used in all cases the implicit back refs is used. The major shortcoming
 * of the full back refs is its overhead. Every time a tree block gets
 * COWed, we have to update back refs entry for all pointers in it.
 *
 * For a newly allocated tree block, we use implicit back refs for
 * pointers in it. This means most tree related operations only involve
 * implicit back refs. For a tree block created in old transaction, the
 * only way to drop a reference to it is COW it. So we can detect the
 * event that tree block loses its owner tree's reference and do the
 * back refs conversion.
 *
 * When a tree block is COWed through a tree, there are four cases:
 *
 * The reference count of the block is one and the tree is the block's
 * owner tree. Nothing to do in this case.
 *
 * The reference count of the block is one and the tree is not the
 * block's owner tree. In this case, full back refs is used for pointers
 * in the block. Remove these full back refs, add implicit back refs for
 * every pointers in the new block.
 *
 * The reference count of the block is greater than one and the tree is
 * the block's owner tree. In this case, implicit back refs is used for
 * pointers in the block. Add full back refs for every pointers in the
 * block, increase lower level extents' reference counts. The original
 * implicit back refs are entailed to the new block.
 *
 * The reference count of the block is greater than one and the tree is
 * not the block's owner tree. Add implicit back refs for every pointer in
 * the new block, increase lower level extents' reference count.
 *
 * Back Reference Key composing:
 *
 * The key objectid corresponds to the first byte in the extent,
 * The key type is used to differentiate between types of back refs.
 * There are different meanings of the key offset for different types
 * of back refs.
 *
 * File extents can be referenced by:
 *
 * - multiple snapshots, subvolumes, or different generations in one subvol
 * - different files inside a single subvolume
 * - different offsets inside a file (bookend extents in file.c)
 *
 * The extent ref structure for the implicit back refs has fields for:
 *
 * - Objectid of the subvolume root
 * - objectid of the file holding the reference
 * - original offset in the file
 * - how many bookend extents
 *
 * The key offset for the implicit back refs is hash of the first
 * three fields.
 *
 * The extent ref structure for the full back refs has field for:
 *
 * - number of pointers in the tree leaf
 *
 * The key offset for the implicit back refs is the first byte of
 * the tree leaf
 *
 * When a file extent is allocated, The implicit back refs is used.
 * the fields are filled in:
 *
 *     (root_key.objectid, inode objectid, offset in file, 1)
 *
 * When a file extent is removed file truncation, we find the
 * corresponding implicit back refs and check the following fields:
 *
 *     (btrfs_header_owner(leaf), inode objectid, offset in file)
 *
 * Btree extents can be referenced by:
 *
 * - Different subvolumes
 *
 * Both the implicit back refs and the full back refs for tree blocks
 * only consist of key. The key offset for the implicit back refs is
 * objectid of block's owner tree. The key offset for the full back refs
 * is the first byte of parent block.
 *
 * When implicit back refs is used, information about the lowest key and
 * level of the tree block are required. These information are stored in
 * tree block info structure.
 */

#ifdef BTRFS_COMPAT_EXTENT_TREE_V0


static int convert_extent_item_v0(struct btrfs_trans_handle *trans,
				  struct btrfs_root *root,
				  struct btrfs_path *path,
				  u64 owner, u32 extra_size)
{
	struct btrfs_extent_item *item;
	struct btrfs_extent_item_v0 *ei0;
	struct btrfs_extent_ref_v0 *ref0;
	struct btrfs_tree_block_info *bi;
	struct extent_buffer *leaf;
	struct btrfs_key key;
	struct btrfs_key found_key;
	u32 new_size = sizeof(*item);
	u64 refs;
	int ret;

	leaf = path->nodes[0];
	BUG_ON(btrfs_item_size_nr(leaf, path->slots[0]) != sizeof(*ei0));

	btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
	ei0 = btrfs_item_ptr(leaf, path->slots[0],
			     struct btrfs_extent_item_v0);
	refs = btrfs_extent_refs_v0(leaf, ei0);

	if (owner == (u64)-1) {
		while (1) {
			if (path->slots[0] >= btrfs_header_nritems(leaf)) {
				ret = btrfs_next_leaf(root, path);
				if (ret < 0)
					return ret;
				BUG_ON(ret > 0); /* Corruption */
				leaf = path->nodes[0];
			}
			btrfs_item_key_to_cpu(leaf, &found_key,
					      path->slots[0]);
			BUG_ON(key.objectid != found_key.objectid);
			if (found_key.type != BTRFS_EXTENT_REF_V0_KEY) {
				path->slots[0]++;
				continue;
			}
			ref0 = btrfs_item_ptr(leaf, path->slots[0],
					      struct btrfs_extent_ref_v0);
			owner = btrfs_ref_objectid_v0(leaf, ref0);
			break;
		}
	}
	btrfs_release_path(path);

	if (owner < BTRFS_FIRST_FREE_OBJECTID)
		new_size += sizeof(*bi);

	new_size -= sizeof(*ei0);
	ret = btrfs_search_slot(trans, root, &key, path,
				new_size + extra_size, 1);
	if (ret < 0)
		return ret;
	BUG_ON(ret); /* Corruption */

	btrfs_extend_item(root->fs_info, path, new_size);

	leaf = path->nodes[0];
	item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item);
	btrfs_set_extent_refs(leaf, item, refs);
	/* FIXME: get real generation */
	btrfs_set_extent_generation(leaf, item, 0);
	if (owner < BTRFS_FIRST_FREE_OBJECTID) {
		btrfs_set_extent_flags(leaf, item,
				       BTRFS_EXTENT_FLAG_TREE_BLOCK |
				       BTRFS_BLOCK_FLAG_FULL_BACKREF);
		bi = (struct btrfs_tree_block_info *)(item + 1);
		/* FIXME: get first key of the block */
		memzero_extent_buffer(leaf, (unsigned long)bi, sizeof(*bi));
		btrfs_set_tree_block_level(leaf, bi, (int)owner);
	} else {
		btrfs_set_extent_flags(leaf, item, BTRFS_EXTENT_FLAG_DATA);
	}
	btrfs_mark_buffer_dirty(leaf);
	return 0;
}
Contributors
Person Tokens Prop Commits CommitProp
zheng yan zheng yan 352 72.28% 3 27.27%
josef bacik josef bacik 65 13.35% 1 9.09%
chris mason chris mason 59 12.11% 3 27.27%
liu hui liu hui 6 1.23% 1 9.09%
jeff mahoney jeff mahoney 4 0.82% 2 18.18%
david sterba david sterba 1 0.21% 1 9.09%
Total 487 100.00% 11 100.00%

#endif



static u64 hash_extent_data_ref(u64 root_objectid, u64 owner, u64 offset)
{
	u32 high_crc = ~(u32)0;
	u32 low_crc = ~(u32)0;
	__le64 lenum;

	lenum = cpu_to_le64(root_objectid);
	high_crc = btrfs_crc32c(high_crc, &lenum, sizeof(lenum));
	lenum = cpu_to_le64(owner);
	low_crc = btrfs_crc32c(low_crc, &lenum, sizeof(lenum));
	lenum = cpu_to_le64(offset);
	low_crc = btrfs_crc32c(low_crc, &lenum, sizeof(lenum));

	return ((u64)high_crc << 31) ^ (u64)low_crc;
}

Contributors
Person Tokens Prop Commits CommitProp
zheng yan zheng yan 99 84.62% 2 33.33%
chris mason chris mason 14 11.97% 2 33.33%
filipe david borba manana filipe david borba manana 3 2.56% 1 16.67%
josef bacik josef bacik 1 0.85% 1 16.67%
Total 117 100.00% 6 100.00%



static u64 hash_extent_data_ref_item(struct extent_buffer *leaf,
				     struct btrfs_extent_data_ref *ref)
{
	return hash_extent_data_ref(btrfs_extent_data_ref_root(leaf, ref),
				    btrfs_extent_data_ref_objectid(leaf, ref),
				    btrfs_extent_data_ref_offset(leaf, ref));
}

Contributors
Person Tokens Prop Commits CommitProp
zheng yan zheng yan 35 85.37% 2 66.67%
chris mason chris mason 6 14.63% 1 33.33%
Total 41 100.00% 3 100.00%



static int match_extent_data_ref(struct extent_buffer *leaf,
				 struct btrfs_extent_data_ref *ref,
				 u64 root_objectid, u64 owner, u64 offset)
{
	if (btrfs_extent_data_ref_root(leaf, ref) != root_objectid ||
	    btrfs_extent_data_ref_objectid(leaf, ref) != owner ||
	    btrfs_extent_data_ref_offset(leaf, ref) != offset)
		return 0;
	return 1;
}

Contributors
Person Tokens Prop Commits CommitProp
zheng yan zheng yan 54 90.00% 2 50.00%
josef bacik josef bacik 3 5.00% 1 25.00%
chris mason chris mason 3 5.00% 1 25.00%
Total 60 100.00% 4 100.00%



static noinline int lookup_extent_data_ref(struct btrfs_trans_handle *trans,
					   struct btrfs_root *root,
					   struct btrfs_path *path,
					   u64 bytenr, u64 parent,
					   u64 root_objectid,
					   u64 owner, u64 offset)
{
	struct btrfs_key key;
	struct btrfs_extent_data_ref *ref;
	struct extent_buffer *leaf;
	u32 nritems;
	int ret;
	int recow;
	int err = -ENOENT;

	key.objectid = bytenr;
	if (parent) {
		key.type = BTRFS_SHARED_DATA_REF_KEY;
		key.offset = parent;
	} else {
		key.type = BTRFS_EXTENT_DATA_REF_KEY;
		key.offset = hash_extent_data_ref(root_objectid,
						  owner, offset);
	}
again:
	recow = 0;
	ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
	if (ret < 0) {
		err = ret;
		goto fail;
	}

	if (parent) {
		if (!ret)
			return 0;
#ifdef BTRFS_COMPAT_EXTENT_TREE_V0
		key.type = BTRFS_EXTENT_REF_V0_KEY;
		btrfs_release_path(path);
		ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
		if (ret < 0) {
			err = ret;
			goto fail;
		}
		if (!ret)
			return 0;
#endif
		goto fail;
	}

	leaf = path->nodes[0];
	nritems = btrfs_header_nritems(leaf);
	while (1) {
		if (path->slots[0] >= nritems) {
			ret = btrfs_next_leaf(root, path);
			if (ret < 0)
				err = ret;
			if (ret)
				goto fail;

			leaf = path->nodes[0];
			nritems = btrfs_header_nritems(leaf);
			recow = 1;
		}

		btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
		if (key.objectid != bytenr ||
		    key.type != BTRFS_EXTENT_DATA_REF_KEY)
			goto fail;

		ref = btrfs_item_ptr(leaf, path->slots[0],
				     struct btrfs_extent_data_ref);

		if (match_extent_data_ref(leaf, ref, root_objectid,
					  owner, offset)) {
			if (recow) {
				btrfs_release_path(path);
				goto again;
			}
			err = 0;
			break;
		}
		path->slots[0]++;
	}
fail:
	return err;
}

Contributors
Person Tokens Prop Commits CommitProp
zheng yan zheng yan 309 76.11% 2 50.00%
chris mason chris mason 50 12.32% 1 25.00%
josef bacik josef bacik 47 11.58% 1 25.00%
Total 406 100.00% 4 100.00%



static noinline int insert_extent_data_ref(struct btrfs_trans_handle *trans,
					   struct btrfs_root *root,
					   struct btrfs_path *path,
					   u64 bytenr, u64 parent,
					   u64 root_objectid, u64 owner,
					   u64 offset, int refs_to_add)
{
	struct btrfs_key key;
	struct extent_buffer *leaf;
	u32 size;
	u32 num_refs;
	int ret;

	key.objectid = bytenr;
	if (parent) {
		key.type = BTRFS_SHARED_DATA_REF_KEY;
		key.offset = parent;
		size = sizeof(struct btrfs_shared_data_ref);
	} else {
		key.type = BTRFS_EXTENT_DATA_REF_KEY;
		key.offset = hash_extent_data_ref(root_objectid,
						  owner, offset);
		size = sizeof(struct btrfs_extent_data_ref);
	}

	ret = btrfs_insert_empty_item(trans, root, path, &key, size);
	if (ret && ret != -EEXIST)
		goto fail;

	leaf = path->nodes[0];
	if (parent) {
		struct btrfs_shared_data_ref *ref;
		ref = btrfs_item_ptr(leaf, path->slots[0],
				     struct btrfs_shared_data_ref);
		if (ret == 0) {
			btrfs_set_shared_data_ref_count(leaf, ref, refs_to_add);
		} else {
			num_refs = btrfs_shared_data_ref_count(leaf, ref);
			num_refs += refs_to_add;
			btrfs_set_shared_data_ref_count(leaf, ref, num_refs);
		}
	} else {
		struct btrfs_extent_data_ref *ref;
		while (ret == -EEXIST) {
			ref = btrfs_item_ptr(leaf, path->slots[0],
					     struct btrfs_extent_data_ref);
			if (match_extent_data_ref(leaf, ref, root_objectid,
						  owner, offset))
				break;
			btrfs_release_path(path);
			key.offset++;
			ret = btrfs_insert_empty_item(trans, root, path, &key,
						      size);
			if (ret && ret != -EEXIST)
				goto fail;

			leaf = path->nodes[0];
		}
		ref = btrfs_item_ptr(leaf, path->slots[0],
				     struct btrfs_extent_data_ref);
		if (ret == 0) {
			btrfs_set_extent_data_ref_root(leaf, ref,
						       root_objectid);
			btrfs_set_extent_data_ref_objectid(leaf, ref, owner);
			btrfs_set_extent_data_ref_offset(leaf, ref, offset);
			btrfs_set_extent_data_ref_count(leaf, ref, refs_to_add);
		} else {
			num_refs = btrfs_extent_data_ref_count(leaf, ref);
			num_refs += refs_to_add;
			btrfs_set_extent_data_ref_count(leaf, ref, num_refs);
		}
	}
	btrfs_mark_buffer_dirty(leaf);
	ret = 0;
fail:
	btrfs_release_path(path);
	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
zheng yan zheng yan 253 58.97% 1 14.29%
chris mason chris mason 116 27.04% 4 57.14%
josef bacik josef bacik 43 10.02% 1 14.29%
liu hui liu hui 17 3.96% 1 14.29%
Total 429 100.00% 7 100.00%



static noinline int remove_extent_data_ref(struct btrfs_trans_handle *trans,
					   struct btrfs_root *root,
					   struct btrfs_path *path,
					   int refs_to_drop, int *last_ref)
{
	struct btrfs_key key;
	struct btrfs_extent_data_ref *ref1 = NULL;
	struct btrfs_shared_data_ref *ref2 = NULL;
	struct extent_buffer *leaf;
	u32 num_refs = 0;
	int ret = 0;

	leaf = path->nodes[0];
	btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);

	if (key.type == BTRFS_EXTENT_DATA_REF_KEY) {
		ref1 = btrfs_item_ptr(leaf, path->slots[0],
				      struct btrfs_extent_data_ref);
		num_refs = btrfs_extent_data_ref_count(leaf, ref1);
	} else if (key.type == BTRFS_SHARED_DATA_REF_KEY) {
		ref2 = btrfs_item_ptr(leaf, path->slots[0],
				      struct btrfs_shared_data_ref);
		num_refs = btrfs_shared_data_ref_count(leaf, ref2);
#ifdef BTRFS_COMPAT_EXTENT_TREE_V0
	} else if (key.type == BTRFS_EXTENT_REF_V0_KEY) {
		struct btrfs_extent_ref_v0 *ref0;
		ref0 = btrfs_item_ptr(leaf, path->slots[0],
				      struct btrfs_extent_ref_v0);
		num_refs = btrfs_ref_count_v0(leaf, ref0);
#endif
	} else {
		BUG();
	}

	BUG_ON(num_refs < refs_to_drop);
	num_refs -= refs_to_drop;

	if (num_refs == 0) {
		ret = btrfs_del_item(trans, root, path);
		*last_ref = 1;
	} else {
		if (key.type == BTRFS_EXTENT_DATA_REF_KEY)
			btrfs_set_extent_data_ref_count(leaf, ref1, num_refs);
		else if (key.type == BTRFS_SHARED_DATA_REF_KEY)
			btrfs_set_shared_data_ref_count(leaf, ref2, num_refs);
#ifdef BTRFS_COMPAT_EXTENT_TREE_V0
		else {
			struct btrfs_extent_ref_v0 *ref0;
			ref0 = btrfs_item_ptr(leaf, path->slots[0],
					struct btrfs_extent_ref_v0);
			btrfs_set_ref_count_v0(leaf, ref0, num_refs);
		}
#endif
		btrfs_mark_buffer_dirty(leaf);
	}
	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
zheng yan zheng yan 218 65.66% 1 25.00%
chris mason chris mason 60 18.07% 1 25.00%
josef bacik josef bacik 54 16.27% 2 50.00%
Total 332 100.00% 4 100.00%



static noinline u32 extent_data_ref_count(struct btrfs_path *path,
					  struct btrfs_extent_inline_ref *iref)
{
	struct btrfs_key key;
	struct extent_buffer *leaf;
	struct btrfs_extent_data_ref *ref1;
	struct btrfs_shared_data_ref *ref2;
	u32 num_refs = 0;

	leaf = path->nodes[0];
	btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
	if (iref) {
		if (btrfs_extent_inline_ref_type(leaf, iref) ==
		    BTRFS_EXTENT_DATA_REF_KEY) {
			ref1 = (struct btrfs_extent_data_ref *)(&iref->offset);
			num_refs = btrfs_extent_data_ref_count(leaf, ref1);
		} else {
			ref2 = (struct btrfs_shared_data_ref *)(iref + 1);
			num_refs = btrfs_shared_data_ref_count(leaf, ref2);
		}
	} else if (key.type == BTRFS_EXTENT_DATA_REF_KEY) {
		ref1 = btrfs_item_ptr(leaf, path->slots[0],
				      struct btrfs_extent_data_ref);
		num_refs = btrfs_extent_data_ref_count(leaf, ref1);
	} else if (key.type == BTRFS_SHARED_DATA_REF_KEY) {
		ref2 = btrfs_item_ptr(leaf, path->slots[0],
				      struct btrfs_shared_data_ref);
		num_refs = btrfs_shared_data_ref_count(leaf, ref2);
#ifdef BTRFS_COMPAT_EXTENT_TREE_V0
	} else if (key.type == BTRFS_EXTENT_REF_V0_KEY) {
		struct btrfs_extent_ref_v0 *ref0;
		ref0 = btrfs_item_ptr(leaf, path->slots[0],
				      struct btrfs_extent_ref_v0);
		num_refs = btrfs_ref_count_v0(leaf, ref0);
#endif
	} else {
		WARN_ON(1);
	}
	return num_refs;
}

Contributors
Person Tokens Prop Commits CommitProp
zheng yan zheng yan 188 71.21% 1 20.00%
chris mason chris mason 44 16.67% 2 40.00%
josef bacik josef bacik 32 12.12% 2 40.00%
Total 264 100.00% 5 100.00%



static noinline int lookup_tree_block_ref(struct btrfs_trans_handle *trans,
					  struct btrfs_root *root,
					  struct btrfs_path *path,
					  u64 bytenr, u64 parent,
					  u64 root_objectid)
{
	struct btrfs_key key;
	int ret;

	key.objectid = bytenr;
	if (parent) {
		key.type = BTRFS_SHARED_BLOCK_REF_KEY;
		key.offset = parent;
	} else {
		key.type = BTRFS_TREE_BLOCK_REF_KEY;
		key.offset = root_objectid;
	}

	ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
	if (ret > 0)
		ret = -ENOENT;
#ifdef BTRFS_COMPAT_EXTENT_TREE_V0
	if (ret == -ENOENT && parent) {
		btrfs_release_path(path);
		key.type = BTRFS_EXTENT_REF_V0_KEY;
		ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
		if (ret > 0)
			ret = -ENOENT;
	}
#endif
	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
zheng yan zheng yan 102 61.08% 2 28.57%
chris mason chris mason 63 37.72% 4 57.14%
josef bacik josef bacik 2 1.20% 1 14.29%
Total 167 100.00% 7 100.00%



static noinline int insert_tree_block_ref(struct btrfs_trans_handle *trans,
					  struct btrfs_root *root,
					  struct btrfs_path *path,
					  u64 bytenr, u64 parent,
					  u64 root_objectid)
{
	struct btrfs_key key;
	int ret;

	key.objectid = bytenr;
	if (parent) {
		key.type = BTRFS_SHARED_BLOCK_REF_KEY;
		key.offset = parent;
	} else {
		key.type = BTRFS_TREE_BLOCK_REF_KEY;
		key.offset = root_objectid;
	}

	ret = btrfs_insert_empty_item(trans, root, path, &key, 0);
	btrfs_release_path(path);
	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
zheng yan zheng yan 53 52.48% 2 40.00%
chris mason chris mason 47 46.53% 2 40.00%
josef bacik josef bacik 1 0.99% 1 20.00%
Total 101 100.00% 5 100.00%



static inline int extent_ref_type(u64 parent, u64 owner)
{
	int type;
	if (owner < BTRFS_FIRST_FREE_OBJECTID) {
		if (parent > 0)
			type = BTRFS_SHARED_BLOCK_REF_KEY;
		else
			type = BTRFS_TREE_BLOCK_REF_KEY;
	} else {
		if (parent > 0)
			type = BTRFS_SHARED_DATA_REF_KEY;
		else
			type = BTRFS_EXTENT_DATA_REF_KEY;
	}
	return type;
}

Contributors
Person Tokens Prop Commits CommitProp
zheng yan zheng yan 47 78.33% 2 28.57%
chris mason chris mason 13 21.67% 5 71.43%
Total 60 100.00% 7 100.00%



static int find_next_key(struct btrfs_path *path, int level,
			 struct btrfs_key *key)

{
	for (; level < BTRFS_MAX_LEVEL; level++) {
		if (!path->nodes[level])
			break;
		if (path->slots[level] + 1 >=
		    btrfs_header_nritems(path->nodes[level]))
			continue;
		if (level == 0)
			btrfs_item_key_to_cpu(path->nodes[level], key,
					      path->slots[level] + 1);
		else
			btrfs_node_key_to_cpu(path->nodes[level], key,
					      path->slots[level] + 1);
		return 0;
	}
	return 1;
}

Contributors
Person Tokens Prop Commits CommitProp
zheng yan zheng yan 77 64.71% 3 37.50%
chris mason chris mason 42 35.29% 5 62.50%
Total 119 100.00% 8 100.00%

/*
 * look for inline back ref. if back ref is found, *ref_ret is set
 * to the address of inline back ref, and 0 is returned.
 *
 * if back ref isn't found, *ref_ret is set to the address where it
 * should be inserted, and -ENOENT is returned.
 *
 * if insert is true and there are too many inline back refs, the path
 * points to the extent item, and -EAGAIN is returned.
 *
 * NOTE: inline back refs are ordered in the same way that back ref
 *       items in the tree are ordered.
 */

static noinline_for_stack

int lookup_inline_extent_backref(struct btrfs_trans_handle *trans,
				 struct btrfs_root *root,
				 struct btrfs_path *path,
				 struct btrfs_extent_inline_ref **ref_ret,
				 u64 bytenr, u64 num_bytes,
				 u64 parent, u64 root_objectid,
				 u64 owner, u64 offset, int insert)
{
	struct btrfs_fs_info *fs_info = root->fs_info;
	struct btrfs_key key;
	struct extent_buffer *leaf;
	struct btrfs_extent_item *ei;
	struct btrfs_extent_inline_ref *iref;
	u64 flags;
	u64 item_size;
	unsigned long ptr;
	unsigned long end;
	int extra_size;
	int type;
	int want;
	int ret;
	int err = 0;
	bool skinny_metadata = btrfs_fs_incompat(fs_info, SKINNY_METADATA);

	key.objectid = bytenr;
	key.type = BTRFS_EXTENT_ITEM_KEY;
	key.offset = num_bytes;

	want = extent_ref_type(parent, owner);
	if (insert) {
		extra_size = btrfs_extent_inline_ref_size(want);
		path->keep_locks = 1;
	} else
		extra_size = -1;

	/*
         * Owner is our parent level, so we can just add one to get the level
         * for the block we are interested in.
         */
	if (skinny_metadata && owner < BTRFS_FIRST_FREE_OBJECTID) {
		key.type = BTRFS_METADATA_ITEM_KEY;
		key.offset = owner;
	}

again:
	ret = btrfs_search_slot(trans, root, &key, path, extra_size, 1);
	if (ret < 0) {
		err = ret;
		goto out;
	}

	/*
         * We may be a newly converted file system which still has the old fat
         * extent entries for metadata, so try and see if we have one of those.
         */
	if (ret > 0 && skinny_metadata) {
		skinny_metadata = false;
		if (path->slots[0]) {
			path->slots[0]--;
			btrfs_item_key_to_cpu(path->nodes[0], &key,
					      path->slots[0]);
			if (key.objectid == bytenr &&
			    key.type == BTRFS_EXTENT_ITEM_KEY &&
			    key.offset == num_bytes)
				ret = 0;
		}
		if (ret) {
			key.objectid = bytenr;
			key.type = BTRFS_EXTENT_ITEM_KEY;
			key.offset = num_bytes;
			btrfs_release_path(path);
			goto again;
		}
	}

	if (ret && !insert) {
		err = -ENOENT;
		goto out;
	} else if (WARN_ON(ret)) {
		err = -EIO;
		goto out;
	}

	leaf = path->nodes[0];
	item_size = btrfs_item_size_nr(leaf, path->slots[0]);
#ifdef BTRFS_COMPAT_EXTENT_TREE_V0
	if (item_size < sizeof(*ei)) {
		if (!insert) {
			err = -ENOENT;
			goto out;
		}
		ret = convert_extent_item_v0(trans, root, path, owner,
					     extra_size);
		if (ret < 0) {
			err = ret;
			goto out;
		}
		leaf = path->nodes[0];
		item_size = btrfs_item_size_nr(leaf, path->slots[0]);
	}
#endif
	BUG_ON(item_size < sizeof(*ei));

	ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item);
	flags = btrfs_extent_flags(leaf, ei);

	ptr = (unsigned long)(ei + 1);
	end = (unsigned long)ei + item_size;

	if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK && !skinny_metadata) {
		ptr += sizeof(struct btrfs_tree_block_info);
		BUG_ON(ptr > end);
	}

	err = -ENOENT;
	while (1) {
		if (ptr >= end) {
			WARN_ON(ptr > end);
			break;
		}
		iref = (struct btrfs_extent_inline_ref *)ptr;
		type = btrfs_extent_inline_ref_type(leaf, iref);
		if (want < type)
			break;
		if (want > type) {
			ptr += btrfs_extent_inline_ref_size(type);
			continue;
		}

		if (type == BTRFS_EXTENT_DATA_REF_KEY) {
			struct btrfs_extent_data_ref *dref;
			dref = (struct btrfs_extent_data_ref *)(&iref->offset);
			if (match_extent_data_ref(leaf, dref, root_objectid,
						  owner, offset)) {
				err = 0;
				break;
			}
			if (hash_extent_data_ref_item(leaf, dref) <
			    hash_extent_data_ref(root_objectid, owner, offset))
				break;
		} else {
			u64 ref_offset;
			ref_offset = btrfs_extent_inline_ref_offset(leaf, iref);
			if (parent > 0) {
				if (parent == ref_offset) {
					err = 0;
					break;
				}
				if (ref_offset < parent)
					break;
			} else {
				if (root_objectid == ref_offset) {
					err = 0;
					break;
				}
				if (ref_offset < root_objectid)
					break;
			}
		}
		ptr += btrfs_extent_inline_ref_size(type);
	}
	if (err == -ENOENT && insert) {
		if (item_size + extra_size >=
		    BTRFS_MAX_EXTENT_ITEM_SIZE(root)) {
			err = -EAGAIN;
			goto out;
		}
		/*
                 * To add new inline back ref, we have to make sure
                 * there is no corresponding back ref item.
                 * For simplicity, we just do not add new inline back
                 * ref if there is any kind of item for this block
                 */
		if (find_next_key(path, 0, &key) == 0 &&
		    key.objectid == bytenr &&
		    key.type < BTRFS_BLOCK_GROUP_ITEM_KEY) {
			err = -EAGAIN;
			goto out;
		}
	}
	*ref_ret = (struct btrfs_extent_inline_ref *)ptr;
out:
	if (insert) {
		path->keep_locks = 0;
		btrfs_unlock_up_safe(path, 1);
	}
	return err;
}

Contributors
Person Tokens Prop Commits CommitProp
zheng yan zheng yan 585 66.63% 5 31.25%
josef bacik josef bacik 161 18.34% 2 12.50%
chris mason chris mason 97 11.05% 5 31.25%
jeff mahoney jeff mahoney 26 2.96% 2 12.50%
filipe david borba manana filipe david borba manana 6 0.68% 1 6.25%
dulshani gunawardhana dulshani gunawardhana 3 0.34% 1 6.25%
Total 878 100.00% 16 100.00%

/*
 * helper to add new inline back ref
 */

static noinline_for_stack

void setup_inline_extent_backref(struct btrfs_root *root,
				 struct btrfs_path *path,
				 struct btrfs_extent_inline_ref *iref,
				 u64 parent, u64 root_objectid,
				 u64 owner, u64 offset, int refs_to_add,
				 struct btrfs_delayed_extent_op *extent_op)
{
	struct extent_buffer *leaf;
	struct btrfs_extent_item *ei;
	unsigned long ptr;
	unsigned long end;
	unsigned long item_offset;
	u64 refs;
	int size;
	int type;

	leaf = path->nodes[0];
	ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item);
	item_offset = (unsigned long)iref - (unsigned long)ei;

	type = extent_ref_type(parent, owner);
	size = btrfs_extent_inline_ref_size(type);

	btrfs_extend_item(root->fs_info, path, size);

	ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item);
	refs = btrfs_extent_refs(leaf, ei);
	refs += refs_to_add;
	btrfs_set_extent_refs(leaf, ei, refs);
	if (extent_op)
		__run_delayed_extent_op(extent_op, leaf, ei);

	ptr = (unsigned long)ei + item_offset;
	end = (unsigned long)ei + btrfs_item_size_nr(leaf, path->slots[0]);
	if (ptr < end - size)
		memmove_extent_buffer(leaf, ptr + size, ptr,
				      end - size - ptr);

	iref = (struct btrfs_extent_inline_ref *)ptr;
	btrfs_set_extent_inline_ref_type(leaf, iref, type);
	if (type == BTRFS_EXTENT_DATA_REF_KEY) {
		struct btrfs_extent_data_ref *dref;
		dref = (struct btrfs_extent_data_ref *)(&iref->offset);
		btrfs_set_extent_data_ref_root(leaf, dref, root_objectid);
		btrfs_set_extent_data_ref_objectid(leaf, dref, owner);
		btrfs_set_extent_data_ref_offset(leaf, dref, offset);
		btrfs_set_extent_data_ref_count(leaf, dref, refs_to_add);
	} else if (type == BTRFS_SHARED_DATA_REF_KEY) {
		struct btrfs_shared_data_ref *sref;
		sref = (struct btrfs_shared_data_ref *)(iref + 1);
		btrfs_set_shared_data_ref_count(leaf, sref, refs_to_add);
		btrfs_set_extent_inline_ref_offset(leaf, iref, parent);
	} else if (type == BTRFS_SHARED_BLOCK_REF_KEY) {
		btrfs_set_extent_inline_ref_offset(leaf, iref, parent);
	} else {
		btrfs_set_extent_inline_ref_offset(leaf, iref, root_objectid);
	}
	btrfs_mark_buffer_dirty(leaf);
}

Contributors
Person Tokens Prop Commits CommitProp
zheng yan zheng yan 332 81.37% 3 42.86%
chris mason chris mason 70 17.16% 1 14.29%
josef bacik josef bacik 3 0.74% 1 14.29%
jeff mahoney jeff mahoney 3 0.74% 2 28.57%
Total 408 100.00% 7 100.00%



static int lookup_extent_backref(struct btrfs_trans_handle *trans,
				 struct btrfs_root *root,
				 struct btrfs_path *path,
				 struct btrfs_extent_inline_ref **ref_ret,
				 u64 bytenr, u64 num_bytes, u64 parent,
				 u64 root_objectid, u64 owner, u64 offset)
{
	int ret;

	ret = lookup_inline_extent_backref(trans, root, path, ref_ret,
					   bytenr, num_bytes, parent,
					   root_objectid, owner, offset, 0);
	if (ret != -ENOENT)
		return ret;

	btrfs_release_path(path);
	*ref_ret = NULL;

	if (owner < BTRFS_FIRST_FREE_OBJECTID) {
		ret = lookup_tree_block_ref(trans, root, path, bytenr, parent,
					    root_objectid);
	} else {
		ret = lookup_extent_data_ref(trans, root, path, bytenr, parent,
					     root_objectid, owner, offset);
	}
	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
zheng yan zheng yan 114 77.55% 3 60.00%
chris mason chris mason 33 22.45% 2 40.00%
Total 147 100.00% 5 100.00%

/*
 * helper to update/remove inline back ref
 */

static noinline_for_stack

void update_inline_extent_backref(struct btrfs_root *root,
				  struct btrfs_path *path,
				  struct btrfs_extent_inline_ref *iref,
				  int refs_to_mod,
				  struct btrfs_delayed_extent_op *extent_op,
				  int *last_ref)
{
	struct extent_buffer *leaf;
	struct btrfs_extent_item *ei;
	struct btrfs_extent_data_ref *dref = NULL;
	struct btrfs_shared_data_ref *sref = NULL;
	unsigned long ptr;
	unsigned long end;
	u32 item_size;
	int size;
	int type;
	u64 refs;

	leaf = path->nodes[0];
	ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item);
	refs = btrfs_extent_refs(leaf, ei);
	WARN_ON(refs_to_mod < 0 && refs + refs_to_mod <= 0);
	refs += refs_to_mod;
	btrfs_set_extent_refs(leaf, ei, refs);
	if (extent_op)
		__run_delayed_extent_op(extent_op, leaf, ei);

	type = btrfs_extent_inline_ref_type(leaf, iref);

	if (type == BTRFS_EXTENT_DATA_REF_KEY) {
		dref = (struct btrfs_extent_data_ref *)(&iref->offset);
		refs = btrfs_extent_data_ref_count(leaf, dref);
	} else if (type == BTRFS_SHARED_DATA_REF_KEY) {
		sref = (struct btrfs_shared_data_ref *)(iref + 1);
		refs = btrfs_shared_data_ref_count(leaf, sref);
	} else {
		refs = 1;
		BUG_ON(refs_to_mod != -1);
	}

	BUG_ON(refs_to_mod < 0 && refs < -refs_to_mod);
	refs += refs_to_mod;

	if (refs > 0) {
		if (type == BTRFS_EXTENT_DATA_REF_KEY)
			btrfs_set_extent_data_ref_count(leaf, dref, refs);
		else
			btrfs_set_shared_data_ref_count(leaf, sref, refs);
	} else {
		*last_ref = 1;
		size =  btrfs_extent_inline_ref_size(type);
		item_size = btrfs_item_size_nr(leaf, path->slots[0]);
		ptr = (unsigned long)iref;
		end = (unsigned long)ei + item_size;
		if (ptr + size < end)
			memmove_extent_buffer(leaf, ptr, ptr + size,
					      end - ptr - size);
		item_size -= size;
		btrfs_truncate_item(root->fs_info, path, item_size, 1);
	}
	btrfs_mark_buffer_dirty(leaf);
}

Contributors
Person Tokens Prop Commits CommitProp
zheng yan zheng yan 323 84.78% 5 41.67%
chris mason chris mason 46 12.07% 4 33.33%
josef bacik josef bacik 9 2.36% 1 8.33%
jeff mahoney jeff mahoney 3 0.79% 2 16.67%
Total 381 100.00% 12 100.00%


static noinline_for_stack

int insert_inline_extent_backref(struct btrfs_trans_handle *trans,
				 struct btrfs_root *root,
				 struct btrfs_path *path,
				 u64 bytenr, u64 num_bytes, u64 parent,
				 u64 root_objectid, u64 owner,
				 u64 offset, int refs_to_add,
				 struct btrfs_delayed_extent_op *extent_op)
{
	struct btrfs_extent_inline_ref *iref;
	int ret;

	ret = lookup_inline_extent_backref(trans, root, path, &iref,
					   bytenr, num_bytes, parent,
					   root_objectid, owner, offset, 1);
	if (ret == 0) {
		BUG_ON(owner < BTRFS_FIRST_FREE_OBJECTID);
		update_inline_extent_backref(root, path, iref,
					     refs_to_add, extent_op, NULL);
	} else if (ret == -ENOENT) {
		setup_inline_extent_backref(root, path, iref, parent,
					    root_objectid, owner, offset,
					    refs_to_add, extent_op);
		ret = 0;
	}
	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
zheng yan zheng yan 81 53.29% 1 20.00%
chris mason chris mason 65 42.76% 2 40.00%
jeff mahoney jeff mahoney 4 2.63% 1 20.00%
josef bacik josef bacik 2 1.32% 1 20.00%
Total 152 100.00% 5 100.00%



static int insert_extent_backref(struct btrfs_trans_handle *trans,
				 struct btrfs_root *root,
				 struct btrfs_path *path,
				 u64 bytenr, u64 parent, u64 root_objectid,
				 u64 owner, u64 offset, int refs_to_add)
{
	int ret;
	if (owner < BTRFS_FIRST_FREE_OBJECTID) {
		BUG_ON(refs_to_add != 1);
		ret = insert_tree_block_ref(trans, root, path, bytenr,
					    parent, root_objectid);
	} else {
		ret = insert_extent_data_ref(trans, root, path, bytenr,
					     parent, root_objectid,
					     owner, offset, refs_to_add);
	}
	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
zheng yan zheng yan 62 60.19% 2 22.22%
chris mason chris mason 41 39.81% 7 77.78%
Total 103 100.00% 9 100.00%



static int remove_extent_backref(struct btrfs_trans_handle *trans,
				 struct btrfs_root *root,
				 struct btrfs_path *path,
				 struct btrfs_extent_inline_ref *iref,
				 int refs_to_drop, int is_data, int *last_ref)
{
	int ret = 0;

	BUG_ON(!is_data && refs_to_drop != 1);
	if (iref) {
		update_inline_extent_backref(root, path, iref,
					     -refs_to_drop, NULL, last_ref);
	} else if (is_data) {
		ret = remove_extent_data_ref(trans, root, path, refs_to_drop,
					     last_ref);
	} else {
		*last_ref = 1;
		ret = btrfs_del_item(trans, root, path);
	}
	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
zheng yan zheng yan 75 64.10% 1 16.67%
chris mason chris mason 27 23.08% 3 50.00%
josef bacik josef bacik 13 11.11% 1 16.67%
jeff mahoney jeff mahoney 2 1.71% 1 16.67%
Total 117 100.00% 6 100.00%


#define in_range(b, first, len)        ((b) >= (first) && (b) < (first) + (len))


static int btrfs_issue_discard(struct block_device *bdev, u64 start, u64 len,
			       u64 *discarded_bytes)
{
	int j, ret = 0;
	u64 bytes_left, end;
	u64 aligned_start = ALIGN(start, 1 << 9);

	if (WARN_ON(start != aligned_start)) {
		len -= aligned_start - start;
		len = round_down(len, 1 << 9);
		start = aligned_start;
	}

	*discarded_bytes = 0;

	if (!len)
		return 0;

	end = start + len;
	bytes_left = len;

	/* Skip any superblocks on this device. */
	for (j = 0; j < BTRFS_SUPER_MIRROR_MAX; j++) {
		u64 sb_start = btrfs_sb_offset(j);
		u64 sb_end = sb_start + BTRFS_SUPER_INFO_SIZE;
		u64 size = sb_start - start;

		if (!in_range(sb_start, start, bytes_left) &&
		    !in_range(sb_end, start, bytes_left) &&
		    !in_range(start, sb_start, BTRFS_SUPER_INFO_SIZE))
			continue;

		/*
                 * Superblock spans beginning of range.  Adjust start and
                 * try again.
                 */
		if (sb_start <= start) {
			start += sb_end - start;
			if (start > end) {
				bytes_left = 0;
				break;
			}
			bytes_left = end - start;
			continue;
		}

		if (size) {
			ret = blkdev_issue_discard(bdev, start >> 9, size >> 9,
						   GFP_NOFS, 0);
			if (!ret)
				*discarded_bytes += size;
			else if (ret != -EOPNOTSUPP)
				return ret;
		}

		start = sb_end;
		if (start > end) {
			bytes_left = 0;
			break;
		}
		bytes_left = end - start;
	}

	if (bytes_left) {
		ret = blkdev_issue_discard(bdev, start >> 9, bytes_left >> 9,
					   GFP_NOFS, 0);
		if (!ret)
			*discarded_bytes += bytes_left;
	}
	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
jeff mahoney jeff mahoney 279 89.14% 3 33.33%
zheng yan zheng yan 20 6.39% 1 11.11%
chris mason chris mason 8 2.56% 1 11.11%
li dongyang li dongyang 3 0.96% 1 11.11%
christoph hellwig christoph hellwig 2 0.64% 2 22.22%
miao xie miao xie 1 0.32% 1 11.11%
Total 313 100.00% 9 100.00%



int btrfs_discard_extent(struct btrfs_fs_info *fs_info, u64 bytenr,
			 u64 num_bytes, u64 *actual_bytes)
{
	int ret;
	u64 discarded_bytes = 0;
	struct btrfs_bio *bbio = NULL;


	/*
         * Avoid races with device replace and make sure our bbio has devices
         * associated to its stripes that don't go away while we are discarding.
         */
	btrfs_bio_counter_inc_blocked(fs_info);
	/* Tell the block device(s) that the sectors can be discarded */
	ret = btrfs_map_block(fs_info, BTRFS_MAP_DISCARD, bytenr, &num_bytes,
			      &bbio, 0);
	/* Error condition is -ENOMEM */
	if (!ret) {
		struct btrfs_bio_stripe *stripe = bbio->stripes;
		int i;


		for (i = 0; i < bbio->num_stripes; i++, stripe++) {
			u64 bytes;
			if (!stripe->dev->can_discard)
				continue;

			ret = btrfs_issue_discard(stripe->dev->bdev,
						  stripe->physical,
						  stripe->length,
						  &bytes);
			if (!ret)
				discarded_bytes += bytes;
			else if (ret != -EOPNOTSUPP)
				break; /* Logic errors or -ENOMEM, or -EIO but I don't know how that could happen JDM */

			/*
                         * Just in case we get back EOPNOTSUPP for some reason,
                         * just ignore the return value so we don't screw up
                         * people calling discard_extent.
                         */
			ret = 0;
		}
		btrfs_put_bbio(bbio);
	}
	btrfs_bio_counter_dec(fs_info);

	if (actual_bytes)
		*actual_bytes = discarded_bytes;


	if (ret == -EOPNOTSUPP)
		ret = 0;
	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
zheng yan zheng yan 73 37.82% 1 7.69%
li dongyang li dongyang 38 19.69% 1 7.69%
chris mason chris mason 26 13.47% 2 15.38%
josef bacik josef bacik 15 7.77% 1 7.69%
filipe david borba manana filipe david borba manana 11 5.70% 1 7.69%
jeff mahoney jeff mahoney 11 5.70% 3 23.08%
david woodhouse david woodhouse 11 5.70% 1 7.69%
jan schmidt jan schmidt 6 3.11% 1 7.69%
christoph hellwig christoph hellwig 1 0.52% 1 7.69%
zhao lei zhao lei 1 0.52% 1 7.69%
Total 193 100.00% 13 100.00%

/* Can return -ENOMEM */


int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
			 struct btrfs_fs_info *fs_info,
			 u64 bytenr, u64 num_bytes, u64 parent,
			 u64 root_objectid, u64 owner, u64 offset)
{
	int ret;

	BUG_ON(owner < BTRFS_FIRST_FREE_OBJECTID &&
	       root_objectid == BTRFS_TREE_LOG_OBJECTID);

	if (owner < BTRFS_FIRST_FREE_OBJECTID) {
		ret = btrfs_add_delayed_tree_ref(fs_info, trans, bytenr,
					num_bytes,
					parent, root_objectid, (int)owner,
					BTRFS_ADD_DELAYED_REF, NULL);
	} else {
		ret = btrfs_add_delayed_data_ref(fs_info, trans, bytenr,
					num_bytes, parent, root_objectid,
					owner, offset, 0,
					BTRFS_ADD_DELAYED_REF, NULL);
	}
	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
zheng yan zheng yan 95 83.33% 2 22.22%
chris mason chris mason 11 9.65% 4 44.44%
arne jansen arne jansen 4 3.51% 1 11.11%
qu wenruo qu wenruo 2 1.75% 1 11.11%
jeff mahoney jeff mahoney 2 1.75% 1 11.11%
Total 114 100.00% 9 100.00%



static int __btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
				  struct btrfs_fs_info *fs_info,
				  struct btrfs_delayed_ref_node *node,
				  u64 parent, u64 root_objectid,
				  u64 owner, u64 offset, int refs_to_add,
				  struct btrfs_delayed_extent_op *extent_op)
{
	struct btrfs_path *path;
	struct extent_buffer *leaf;
	struct btrfs_extent_item *item;
	struct btrfs_key key;
	u64 bytenr = node->bytenr;
	u64 num_bytes = node->num_bytes;
	u64 refs;
	int ret;

	path = btrfs_alloc_path();
	if (!path)
		return -ENOMEM;

	path->reada = READA_FORWARD;
	path->leave_spinning = 1;
	/* this will setup the path even if it fails to insert the back ref */
	ret = insert_inline_extent_backref(trans, fs_info->extent_root, path,
					   bytenr, num_bytes, parent,
					   root_objectid, owner, offset,
					   refs_to_add, extent_op);
	if ((ret < 0 && ret != -EAGAIN) || !ret)
		goto out;

	/*
         * Ok we had -EAGAIN which means we didn't have space to insert and
         * inline extent ref, so just update the reference count and add a
         * normal backref.
         */
	leaf = path->nodes[0];
	btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
	item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item);
	refs = btrfs_extent_refs(leaf, item);
	btrfs_set_extent_refs(leaf, item, refs + refs_to_add);
	if (extent_op)
		__run_delayed_extent_op(extent_op, leaf, item);

	btrfs_mark_buffer_dirty(leaf);
	btrfs_release_path(path);

	path->reada = READA_FORWARD;
	path->leave_spinning = 1;
	/* now insert the actual backref */
	ret = insert_extent_backref(trans, fs_info->extent_root,
				    path, bytenr, parent, root_objectid,
				    owner, offset, refs_to_add);
	if (ret)
		btrfs_abort_transaction(trans, ret);
out:
	btrfs_free_path(path);
	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
zheng yan zheng yan 206 68.90% 4 22.22%
josef bacik josef bacik 41 13.71% 2 11.11%
chris mason chris mason 22 7.36% 7 38.89%
qu wenruo qu wenruo 18 6.02% 1 5.56%
jeff mahoney jeff mahoney 9 3.01% 2 11.11%
david sterba david sterba 2 0.67% 1 5.56%
liu bo liu bo 1 0.33% 1 5.56%
Total 299 100.00% 18 100.00%



static int run_delayed_data_ref(struct btrfs_trans_handle *trans,
				struct btrfs_fs_info *fs_info,
				struct btrfs_delayed_ref_node *node,
				struct btrfs_delayed_extent_op *extent_op,
				int insert_reserved)
{
	int ret = 0;
	struct btrfs_delayed_data_ref *ref;
	struct btrfs_key ins;
	u64 parent = 0;
	u64 ref_root = 0;
	u64 flags = 0;

	ins.objectid = node->bytenr;
	ins.offset = node->num_bytes;
	ins.type = BTRFS_EXTENT_ITEM_KEY;

	ref = btrfs_delayed_node_to_data_ref(node);
	trace_run_delayed_data_ref(fs_info, node, ref, node->action);

	if (node->type == BTRFS_SHARED_DATA_REF_KEY)
		parent = ref->parent;
	ref_root = ref->root;

	if (node->action == BTRFS_ADD_DELAYED_REF && insert_reserved) {
		if (extent_op)
			flags |= extent_op->flags_to_set;
		ret = alloc_reserved_file_extent(trans, fs_info,
						 parent, ref_root, flags,
						 ref->objectid, ref->offset,
						 &ins, node->ref_mod);
	} else if (node->action == BTRFS_ADD_DELAYED_REF) {
		ret = __btrfs_inc_extent_ref(trans, fs_info, node, parent,
					     ref_root, ref->objectid,
					     ref->offset, node->ref_mod,
					     extent_op);
	} else if (node->action == BTRFS_DROP_DELAYED_REF) {
		ret = __btrfs_free_extent(trans, fs_info, node, parent,
					  ref_root, ref->objectid,
					  ref->offset, node->ref_mod,
					  extent_op);
	} else {
		BUG();
	}
	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
zheng yan zheng yan 199 76.25% 3 27.27%
chris mason chris mason 44 16.86% 5 45.45%
liu bo liu bo 11 4.21% 1 9.09%
jeff mahoney jeff mahoney 7 2.68% 2 18.18%
Total 261 100.00% 11 100.00%



static void __run_delayed_extent_op(struct btrfs_delayed_extent_op *extent_op,
				    struct extent_buffer *leaf,
				    struct btrfs_extent_item *ei)
{
	u64 flags = btrfs_extent_flags(leaf, ei);
	if (extent_op->update_flags) {
		flags |= extent_op->flags_to_set;
		btrfs_set_extent_flags(leaf, ei, flags);
	}

	if (extent_op->update_key) {
		struct btrfs_tree_block_info *bi;
		BUG_ON(!(flags & BTRFS_EXTENT_FLAG_TREE_BLOCK));
		bi = (struct btrfs_tree_block_info *)(ei + 1);
		btrfs_set_tree_block_key(leaf, bi, &extent_op->key);
	}
}

Contributors
Person Tokens Prop Commits CommitProp
zheng yan zheng yan 79 77.45% 1 33.33%
chris mason chris mason 16 15.69% 1 33.33%
yan zheng yan zheng 7 6.86% 1 33.33%
Total 102 100.00% 3 100.00%



static int run_delayed_extent_op(struct btrfs_trans_handle *trans,
				 struct btrfs_fs_info *fs_info,
				 struct btrfs_delayed_ref_node *node,
				 struct btrfs_delayed_extent_op *extent_op)
{
	struct btrfs_key key;
	struct btrfs_path *path;
	struct btrfs_extent_item *ei;
	struct extent_buffer *leaf;
	u32 item_size;
	int ret;
	int err = 0;
	int metadata = !extent_op->is_data;

	if (trans->aborted)
		return 0;

	if (metadata && !btrfs_fs_incompat(fs_info, SKINNY_METADATA))
		metadata = 0;

	path = btrfs_alloc_path();
	if (!path)
		return -ENOMEM;

	key.objectid = node->bytenr;

	if (metadata) {
		key.type = BTRFS_METADATA_ITEM_KEY;
		key.offset = extent_op->level;
	} else {
		key.type = BTRFS_EXTENT_ITEM_KEY;
		key.offset = node->num_bytes;
	}

again:
	path->reada = READA_FORWARD;
	path->leave_spinning = 1;
	ret = btrfs_search_slot(trans, fs_info->extent_root, &key, path, 0, 1);
	if (ret < 0) {
		err = ret;
		goto out;
	}
	if (ret > 0) {
		if (metadata) {
			if (path->slots[0] > 0) {
				path->slots[0]--;
				btrfs_item_key_to_cpu(path->nodes[0], &key,
						      path->slots[0]);
				if (key.objectid == node->bytenr &&
				    key.type == BTRFS_EXTENT_ITEM_KEY &&
				    key.offset == node->num_bytes)
					ret = 0;
			}
			if (ret > 0) {
				btrfs_release_path(path);
				metadata = 0;

				key.objectid = node->bytenr;
				key.offset = node->num_bytes;
				key.type = BTRFS_EXTENT_ITEM_KEY;
				goto again;
			}
		} else {
			err = -EIO;
			goto out;
		}
	}

	leaf = path->nodes[0];
	item_size = btrfs_item_size_nr(leaf, path->slots[0]);
#ifdef BTRFS_COMPAT_EXTENT_TREE_V0
	if (item_size < sizeof(*ei)) {
		ret = convert_extent_item_v0(trans, fs_info->extent_root,
					     path, (u64)-1, 0);
		if (ret < 0) {
			err = ret;
			goto out;
		}
		leaf = path->nodes[0];
		item_size = btrfs_item_size_nr(leaf, path->slots[0]);
	}
#endif
	BUG_ON(item_size < sizeof(*ei));
	ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item);
	__run_delayed_extent_op(extent_op, leaf, ei);

	btrfs_mark_buffer_dirty(leaf);
out:
	btrfs_free_path(path);
	return err;
}

Contributors
Person Tokens Prop Commits CommitProp
zheng yan zheng yan 218 45.04% 2 14.29%
josef bacik josef bacik 93 19.21% 4 28.57%
filipe david borba manana filipe david borba manana 88 18.18% 1 7.14%
chris mason chris mason 59 12.19% 3 21.43%
yan zheng yan zheng 14 2.89% 1 7.14%
jeff mahoney jeff mahoney 11 2.27% 2 14.29%
david sterba david sterba 1 0.21% 1 7.14%
Total 484 100.00% 14 100.00%



static int run_delayed_tree_ref(struct btrfs_trans_handle *trans,
				struct btrfs_fs_info *fs_info,
				struct btrfs_delayed_ref_node *node,
				struct btrfs_delayed_extent_op *extent_op,
				int insert_reserved)
{
	int ret = 0;
	struct btrfs_delayed_tree_ref *ref;
	struct btrfs_key ins;
	u64 parent = 0;
	u64 ref_root = 0;
	bool skinny_metadata = btrfs_fs_incompat(fs_info, SKINNY_METADATA);

	ref = btrfs_delayed_node_to_tree_ref(node);
	trace_run_delayed_tree_ref(fs_info, node, ref, node->action);

	if (node->type == BTRFS_SHARED_BLOCK_REF_KEY)
		parent = ref->parent;
	ref_root = ref->root;

	ins.objectid = node->bytenr;
	if (skinny_metadata) {
		ins.offset = ref->level;
		ins.type = BTRFS_METADATA_ITEM_KEY;
	} else {
		ins.offset = node->num_bytes;
		ins.type = BTRFS_EXTENT_ITEM_KEY;
	}

	if (node->ref_mod != 1) {
		btrfs_err(fs_info,
	"btree block(%llu) has %d references rather than 1: action %d ref_root %llu parent %llu",
			  node->bytenr, node->ref_mod, node->action, ref_root,
			  parent);
		return -EIO;
	}
	if (node->action == BTRFS_ADD_DELAYED_REF && insert_reserved) {
		BUG_ON(!extent_op || !extent_op->update_flags);
		ret = alloc_reserved_tree_block(trans, fs_info,
						parent, ref_root,
						extent_op->flags_to_set,
						&extent_op->key,
						ref->level, &ins);
	} else if (node->action == BTRFS_ADD_DELAYED_REF) {
		ret = __btrfs_inc_extent_ref(trans, fs_info, node,
					     parent, ref_root,
					     ref->level, 0, 1,
					     extent_op);
	} else if (node->action == BTRFS_DROP_DELAYED_REF) {
		ret = __btrfs_free_extent(trans, fs_info, node,
					  parent, ref_root,
					  ref->level, 0, 1, extent_op);
	} else {
		BUG();
	}
	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
zheng yan zheng yan 157 49.37% 2 22.22%
josef bacik josef bacik 61 19.18% 2 22.22%
chris mason chris mason 52 16.35% 1 11.11%
liu bo liu bo 41 12.89% 2 22.22%
jeff mahoney jeff mahoney 7 2.20% 2 22.22%
Total 318 100.00% 9 100.00%

/* helper function to actually process a single delayed ref entry */


static int run_one_delayed_ref(struct btrfs_trans_handle *trans,
			       struct btrfs_fs_info *fs_info,
			       struct btrfs_delayed_ref_node *node,
			       struct btrfs_delayed_extent_op *extent_op,
			       int insert_reserved)
{
	int ret = 0;

	if (trans->aborted) {
		if (insert_reserved)
			btrfs_pin_extent(fs_info, node->bytenr,
					 node->num_bytes, 1);
		return 0;
	}

	if (btrfs_delayed_ref_is_head(node)) {
		struct btrfs_delayed_ref_head *head;
		/*
                 * we've hit the end of the chain and we were supposed
                 * to insert this extent into the tree.  But, it got
                 * deleted before we ever needed to insert it, so all
                 * we have to do is clean up the accounting
                 */
		BUG_ON(extent_op);
		head = btrfs_delayed_node_to_head(node);
		trace_run_delayed_ref_head(fs_info, node, head, node->action);

		if (insert_reserved) {
			btrfs_pin_extent(fs_info, node->bytenr,
					 node->num_bytes, 1);
			if (head->is_data) {
				ret = btrfs_del_csums(trans, fs_info,
						      node->bytenr,
						      node->num_bytes);
			}
		}

		/* Also free its reserved qgroup space */
		btrfs_qgroup_free_delayed_ref(fs_info, head->qgroup_ref_root,
					      head->qgroup_reserved);
		return ret;
	}

	if (node->type == BTRFS_TREE_BLOCK_REF_KEY ||
	    node->type == BTRFS_SHARED_BLOCK_REF_KEY)
		ret = run_delayed_tree_ref(trans, fs_info, node, extent_op,
					   insert_reserved);
	else if (node->type == BTRFS_EXTENT_DATA_REF_KEY ||
		 node->type == BTRFS_SHARED_DATA_REF_KEY)
		ret = run_delayed_data_ref(trans, fs_info, node, extent_op,
					   insert_reserved);
	else
		BUG();
	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
zheng yan zheng yan 125 53.65% 3 17.65%
chris mason chris mason 40 17.17% 6 35.29%
jeff mahoney jeff mahoney 21 9.01% 4 23.53%
josef bacik josef bacik 20 8.58% 1 5.88%
qu wenruo qu wenruo 14 6.01% 1 5.88%
liu bo liu bo 11 4.72% 1 5.88%
liu hui liu hui 2 0.86% 1 5.88%
Total 233 100.00% 17 100.00%


static inline struct btrfs_delayed_ref_node *

select_delayed_ref(struct btrfs_delayed_ref_head *head)
{
	struct btrfs_delayed_ref_node *ref;

	if (list_empty(&head->ref_list))
		return NULL;

	/*
         * Select a delayed ref of type BTRFS_ADD_DELAYED_REF first.
         * This is to prevent a ref count from going down to zero, which deletes
         * the extent item from the extent tree, when there still are references
         * to add, which would fail because they would not find the extent item.
         */
	if (!list_empty(&head->ref_add_list))
		return list_first_entry(&head->ref_add_list,
				struct btrfs_delayed_ref_node, add_list);

	ref = list_first_entry(&head->ref_list, struct btrfs_delayed_ref_node,
			       list);
	ASSERT(list_empty(&ref->add_list));
	return ref;
}

Contributors
Person Tokens Prop Commits CommitProp
wang xiaoguang wang xiaoguang 37 42.53% 1 20.00%
qu wenruo qu wenruo 21 24.14% 1 20.00%
filipe david borba manana filipe david borba manana 12 13.79% 1 20.00%
zheng yan zheng yan 9 10.34% 1 20.00%
josef bacik josef bacik 8 9.20% 1 20.00%
Total 87 100.00% 5 100.00%

/*
 * Returns 0 on success or if called with an already aborted transaction.
 * Returns -ENOMEM or -EIO on failure and will abort the transaction.
 */


static noinline int __btrfs_run_delayed_refs(struct btrfs_trans_handle *trans,
					     struct btrfs_fs_info *fs_info,
					     unsigned long nr)
{
	struct btrfs_delayed_ref_root *delayed_refs;
	struct btrfs_delayed_ref_node *ref;
	struct btrfs_delayed_ref_head *locked_ref = NULL;
	struct btrfs_delayed_extent_op *extent_op;
	ktime_t start = ktime_get();
	int ret;
	unsigned long count = 0;
	unsigned long actual_count = 0;
	int must_insert_reserved = 0;

	delayed_refs = &trans->transaction->delayed_refs;
	while (1) {
		if (!locked_ref) {
			if (count >= nr)
				break;

			spin_lock(&delayed_refs->lock);
			locked_ref = btrfs_select_ref_head(trans);
			if (!locked_ref) {
				spin_unlock(&delayed_refs->lock);
				break;
			}

			/* grab the lock that says we are going to process
                         * all the refs for this head */
			ret = btrfs_delayed_ref_lock(trans, locked_ref);
			spin_unlock(&delayed_refs->lock);
			/*
                         * we may have dropped the spin lock to get the head
                         * mutex lock, and that might have given someone else
                         * time to free the head.  If that's true, it has been
                         * removed from our list and we can move on.
                         */
			if (ret == -EAGAIN) {
				locked_ref = NULL;
				count++;
				continue;
			}
		}

		/*
                 * We need to try and merge add/drops of the same ref since we
                 * can run into issues with relocate dropping the implicit ref
                 * and then it being added back again before the drop can
                 * finish.  If we merged anything we need to re-loop so we can
                 * get a good ref.
                 * Or we can get node references of the same type that weren't
                 * merged when created due to bumps in the tree mod seq, and
                 * we need to merge them to prevent adding an inline extent
                 * backref before dropping it (triggering a BUG_ON at
                 * insert_inline_extent_backref()).
                 */
		spin_lock(&locked_ref->lock);
		btrfs_merge_delayed_refs(trans, fs_info, delayed_refs,
					 locked_ref);

		/*
                 * locked_ref is the head node, so we have to go one
                 * node back for any delayed ref updates
                 */
		ref = select_delayed_ref(locked_ref);

		if (ref && ref->seq &&
		    btrfs_check_delayed_seq(fs_info, delayed_refs, ref->seq)) {
			spin_unlock(&locked_ref->lock);
			spin_lock(&delayed_refs->lock);
			locked_ref->processing = 0;
			delayed_refs->num_heads_ready++;
			spin_unlock(&delayed_refs->lock);
			btrfs_delayed_ref_unlock(locked_ref);
			locked_ref = NULL;
			cond_resched();
			count++;
			continue;
		}

		/*
                 * record the must insert reserved flag before we
                 * drop the spin lock.
                 */
		must_insert_reserved = locked_ref->must_insert_reserved;
		locked_ref->must_insert_reserved = 0;

		extent_op = locked_ref->extent_op;
		locked_ref->extent_op = NULL;

		if (!ref) {


			/* All delayed refs have been processed, Go ahead
                         * and send the head node to run_one_delayed_ref,
                         * so that any accounting fixes can happen
                         */
			ref = &locked_ref->node;

			if (extent_op && must_insert_reserved) {
				btrfs_free_delayed_extent_op(extent_op);
				extent_op = NULL;
			}

			if (extent_op) {
				spin_unlock(&locked_ref->lock);
				ret = run_delayed_extent_op(trans, fs_info,
							    ref, extent_op);
				btrfs_free_delayed_extent_op(extent_op);

				if (ret) {
					/*
                                         * Need to reset must_insert_reserved if
                                         * there was an error so the abort stuff
                                         * can cleanup the reserved space
                                         * properly.
                                         */
					if (must_insert_reserved)
						locked_ref->must_insert_reserved = 1;
					spin_lock(&delayed_refs->lock);
					locked_ref->processing = 0;
					delayed_refs->num_heads_ready++;
					spin_unlock(&delayed_refs->lock);
					btrfs_debug(fs_info,
						    "run_delayed_extent_op returned %d",
						    ret);
					btrfs_delayed_ref_unlock(locked_ref);
					return ret;
				}
				continue;
			}

			/*
                         * Need to drop our head ref lock and re-acquire the
                         * delayed ref lock and then re-check to make sure
                         * nobody got added.
                         */
			spin_unlock(&locked_ref->lock);
			spin_lock(&delayed_refs->lock);
			spin_lock(&locked_ref->lock);
			if (!list_empty(&locked_ref->ref_list) ||
			    locked_ref->extent_op) {
				spin_unlock(&locked_ref->lock);
				spin_unlock(&delayed_refs->lock);
				continue;
			}
			ref->in_tree = 0;
			delayed_refs->num_heads--;
			rb_erase(&locked_ref->href_node,
				 &delayed_refs->href_root);
			spin_unlock(&delayed_refs->lock);
		} else {
			actual_count++;
			ref->in_tree = 0;
			list_del(&ref->list);
			if (!list_empty(&ref->add_list))
				list_del(&ref->add_list);
		}
		atomic_dec(&delayed_refs->num_entries);

		if (!btrfs_delayed_ref_is_head(ref)) {
			/*
                         * when we play the delayed ref, also correct the
                         * ref_mod on head
                         */
			switch (ref->action) {
			case BTRFS_ADD_DELAYED_REF:
			case BTRFS_ADD_DELAYED_EXTENT:
				locked_ref->node.ref_mod -= ref->ref_mod;
				break;
			case BTRFS_DROP_DELAYED_REF:
				locked_ref->node.ref_mod += ref->ref_mod;
				break;
			default:
				WARN_ON(1);
			}
		}
		spin_unlock(&locked_ref->lock);

		ret = run_one_delayed_ref(trans, fs_info, ref, extent_op,
					  must_insert_reserved);

		btrfs_free_delayed_extent_op(extent_op);
		if (ret) {
			spin_lock(&delayed_refs->lock);
			locked_ref->processing = 0;
			delayed_refs->num_heads_ready++;
			spin_unlock(&delayed_refs->lock);
			btrfs_delayed_ref_unlock(locked_ref);
			btrfs_put_delayed_ref(ref);
			btrfs_debug(fs_info, "run_one_delayed_ref returned %d",
				    ret);
			return ret;
		}

		/*
                 * If this node is a head, that means all the refs in this head
                 * have been dealt with, and we will pick the next head to deal
                 * with, so we must unlock the head and drop it from the cluster
                 * list before we release it.
                 */
		if (btrfs_delayed_ref_is_head(ref)) {
			if (locked_ref->is_data &&
			    locked_ref->total_ref_mod < 0) {
				spin_lock(&delayed_refs->lock);
				delayed_refs->pending_csums -= ref->num_bytes;
				spin_unlock(&delayed_refs->lock);
			}
			btrfs_delayed_ref_unlock(locked_ref);
			locked_ref = NULL;
		}
		btrfs_put_delayed_ref(ref);
		count++;
		cond_resched();
	}

	/*
         * We don't want to include ref heads since we can have empty ref heads
         * and those will drastically skew our runtime down since we just do
         * accounting, no actual extent tree updates.
         */
	if (actual_count > 0) {
		u64 runtime = ktime_to_ns(ktime_sub(ktime_get(), start));
		u64 avg;

		/*
                 * We weigh the current average higher than our current runtime
                 * to avoid large swings in the average.
                 */
		spin_lock(&delayed_refs->lock);
		avg = fs_info->avg_delayed_ref_runtime * 3 + runtime;
		fs_info->avg_delayed_ref_runtime = avg >> 2;	/* div by 4 */
		spin_unlock(&delayed_refs->lock);
	}
	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
josef bacik josef bacik 352 42.62% 10 27.78%
zheng yan zheng yan 150 18.16% 3 8.33%
arne jansen arne jansen 96 11.62% 2 5.56%
jeff mahoney jeff mahoney 56 6.78% 4 11.11%
wang xiaoguang wang xiaoguang 40 4.84% 2 5.56%
miao xie miao xie 39 4.72% 2 5.56%
chris mason chris mason 38 4.60% 5 13.89%
liu bo liu bo 23 2.78% 2 5.56%
filipe david borba manana filipe david borba manana 12 1.45% 1 2.78%
simon kirby simon kirby 8 0.97% 1 2.78%
qu wenruo qu wenruo 6 0.73% 1 2.78%
david sterba david sterba 3 0.36% 1 2.78%
jan schmidt jan schmidt 2 0.24% 1 2.78%
nicholas d steeves nicholas d steeves 1 0.12% 1 2.78%
Total 826 100.00% 36 100.00%

#ifdef SCRAMBLE_DELAYED_REFS
/*
 * Normally delayed refs get processed in ascending bytenr order. This
 * correlates in most cases to the order added. To expose dependencies on this
 * order, we start to process the tree in the middle instead of the beginning
 */


static u64 find_middle(struct rb_root *root)
{
	struct rb_node *n = root->rb_node;
	struct btrfs_delayed_ref_node *entry;
	int alt = 1;
	u64 middle;
	u64 first = 0, last = 0;

	n = rb_first(root);
	if (n) {
		entry = rb_entry(n, struct btrfs_delayed_ref_node, rb_node);
		first = entry->bytenr;
	}
	n = rb_last(root);
	if (n) {
		entry = rb_entry(n, struct btrfs_delayed_ref_node, rb_node);
		last = entry->bytenr;
	}
	n = root->rb_node;

	while (n) {
		entry = rb_entry(n, struct btrfs_delayed_ref_node, rb_node);
		WARN_ON(!entry->in_tree);

		middle = entry->bytenr;

		if (alt)
			n = n->rb_left;
		else
			n = n->rb_right;

		alt = 1 - alt;
	}
	return middle;
}
Contributors
Person Tokens Prop Commits CommitProp
arne jansen arne jansen 134 79.76% 2 66.67%
josef bacik josef bacik 34 20.24% 1 33.33%
Total 168 100.00% 3 100.00%

#endif



static inline u64 heads_to_leaves(struct btrfs_fs_info *fs_info, u64 heads)
{
	u64 num_bytes;

	num_bytes = heads * (sizeof(struct btrfs_extent_item) +
			     sizeof(struct btrfs_extent_inline_ref));
	if (!btrfs_fs_incompat(fs_info, SKINNY_METADATA))
		num_bytes += heads * sizeof(struct btrfs_tree_block_info);

	/*
         * We don't ever fill up leaves all the way so multiply by 2 just to be
         * closer to what we're really going to want to use.
         */
	return div_u64(num_bytes, BTRFS_LEAF_DATA_SIZE(fs_info));
}

Contributors
Person Tokens Prop Commits CommitProp
josef bacik josef bacik 63 92.65% 1 20.00%
jeff mahoney jeff mahoney 3 4.41% 2 40.00%
david sterba david sterba 1 1.47% 1 20.00%
nicholas d steeves nicholas d steeves 1 1.47% 1 20.00%
Total 68 100.00% 5 100.00%

/*
 * Takes the number of bytes to be csumm'ed and figures out how many leaves it
 * would require to store the csums for that many bytes.
 */


u64 btrfs_csum_bytes_to_leaves(struct btrfs_fs_info *fs_info, u64 csum_bytes)
{
	u64 csum_size;
	u64 num_csums_per_leaf;
	u64 num_csums;

	csum_size = BTRFS_MAX_ITEM_SIZE(fs_info);
	num_csums_per_leaf = div64_u64(csum_size,
			(u64)btrfs_super_csum_size(fs_info->super_copy));
	num_csums = div64_u64(csum_bytes, fs_info->sectorsize);
	num_csums += num_csums_per_leaf - 1;
	num_csums = div64_u64(num_csums, num_csums_per_leaf);
	return num_csums;
}

Contributors
Person Tokens Prop Commits CommitProp
josef bacik josef bacik 68 90.67% 1 20.00%
jeff mahoney jeff mahoney 6 8.00% 3 60.00%
chris mason chris mason 1 1.33% 1 20.00%
Total 75 100.00% 5 100.00%



int btrfs_check_space_for_delayed_refs(struct btrfs_trans_handle *trans,
				       struct btrfs_fs_info *fs_info)
{
	struct btrfs_block_rsv *global_rsv;
	u64 num_heads = trans->transaction->delayed_refs.num_heads_ready;
	u64 csum_bytes = trans->transaction->delayed_refs.pending_csums;
	u64 num_dirty_bgs = trans->transaction->num_dirty_bgs;
	u64 num_bytes, num_dirty_bgs_bytes;
	int ret = 0;

	num_bytes = btrfs_calc_trans_metadata_size(fs_info, 1);
	num_heads = heads_to_leaves(fs_info, num_heads);
	if (num_heads > 1)
		num_bytes += (num_heads - 1) * fs_info->nodesize;
	num_bytes <<= 1;
	num_bytes += btrfs_csum_bytes_to_leaves(fs_info, csum_bytes) *
							fs_info->nodesize;
	num_dirty_bgs_bytes = btrfs_calc_trans_metadata_size(fs_info,
							     num_dirty_bgs);
	global_rsv = &fs_info->global_block_rsv;

	/*
         * If we can't allocate any more chunks lets make sure we have _lots_ of
         * wiggle room since running delayed refs can create more delayed refs.
         */
	if (global_rsv->space_info->full) {
		num_dirty_bgs_bytes <<= 1;
		num_bytes <<= 1;
	}

	spin_lock(&global_rsv->lock);
	if (global_rsv->reserved <= num_bytes + num_dirty_bgs_bytes)
		ret = 1;
	spin_unlock(&global_rsv->lock);
	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
josef bacik josef bacik 166 91.21% 4 40.00%
jeff mahoney jeff mahoney 14 7.69% 4 40.00%
chris mason chris mason 1 0.55% 1 10.00%
david sterba david sterba 1 0.55% 1 10.00%
Total 182 100.00% 10 100.00%



int btrfs_should_throttle_delayed_refs(struct btrfs_trans_handle *trans,
				       struct btrfs_fs_info *fs_info)
{
	u64 num_entries =
		atomic_read(&trans->transaction->delayed_refs.num_entries);
	u64 avg_runtime;
	u64 val;

	smp_mb();
	avg_runtime = fs_info->avg_delayed_ref_runtime;
	val = num_entries * avg_runtime;
	if (val >= NSEC_PER_SEC)
		return 1;
	if (val >= NSEC_PER_SEC / 2)
		return 2;

	return btrfs_check_space_for_delayed_refs(trans, fs_info);
}

Contributors
Person Tokens Prop Commits CommitProp
josef bacik josef bacik 55 69.62% 1 25.00%
chris mason chris mason 20 25.32% 1 25.00%
jeff mahoney jeff mahoney 3 3.80% 1 25.00%
wang xiaoguang wang xiaoguang 1 1.27% 1 25.00%
Total 79 100.00% 4 100.00%


struct async_delayed_refs {
	
struct btrfs_root *root;
	
u64 transid;
	
int count;
	
int error;
	
int sync;
	
struct completion wait;
	
struct btrfs_work work;
};


static inline struct async_delayed_refs *

to_async_delayed_refs(struct btrfs_work *work)
{
	return container_of(work, struct async_delayed_refs, work);
}

Contributors
Person Tokens Prop Commits CommitProp
jeff mahoney jeff mahoney 25 100.00% 1 100.00%
Total 25 100.00% 1 100.00%



static void delayed_ref_async_start(struct btrfs_work *work)
{
	struct async_delayed_refs *async = to_async_delayed_refs(work);
	struct btrfs_trans_handle *trans;
	struct btrfs_fs_info *fs_info = async->root->fs_info;
	int ret;

	/* if the commit is already started, we don't need to wait here */
	if (btrfs_transaction_blocked(fs_info))
		goto done;

	trans = btrfs_join_transaction(async->root);
	if (IS_ERR(trans)) {
		async->error = PTR_ERR(trans);
		goto done;
	}

	/*
         * trans->sync means that when we call end_transaction, we won't
         * wait on delayed refs
         */
	trans->sync = true;

	/* Don't bother flushing if we got into a different transaction */
	if (trans->transid > async->transid)
		goto end;

	ret = btrfs_run_delayed_refs(trans, fs_info, async->count);
	if (ret)
		async->error = ret;
end:
	ret = btrfs_end_transaction(trans);
	if (ret && !async->error)
		async->error = ret;
done:
	if (async->sync)
		complete(&async->wait);
	else
		kfree(async);
}

Contributors
Person Tokens Prop Commits CommitProp
chris mason chris mason 142 83.04% 2 50.00%
jeff mahoney jeff mahoney 17 9.94% 1 25.00%
josef bacik josef bacik 12 7.02% 1 25.00%
Total 171 100.00% 4 100.00%



int btrfs_async_run_delayed_refs(struct btrfs_fs_info *fs_info,
				 unsigned long count, u64 transid, int wait)
{
	struct async_delayed_refs *async;
	int ret;

	async = kmalloc(sizeof(*async), GFP_NOFS);
	if (!async)
		return -ENOMEM;

	async->root = fs_info->tree_root;
	async->count = count;
	async->error = 0;
	async->transid = transid;
	if (wait)
		async->sync = 1;
	else
		async->sync = 0;
	init_completion(&async->wait);

	btrfs_init_work(&async->work, btrfs_extent_refs_helper,
			delayed_ref_async_start, NULL, NULL);

	btrfs_queue_work(fs_info->extent_workers, &async->work);

	if (wait) {
		wait_for_completion(&async->wait);
		ret = async->error;
		kfree(async);
		return ret;
	}
	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
chris mason chris mason 147 91.88% 1 25.00%
josef bacik josef bacik 9 5.62% 1 25.00%
liu bo liu bo 2 1.25% 1 25.00%
jeff mahoney jeff mahoney 2 1.25% 1 25.00%
Total 160 100.00% 4 100.00%

/*
 * this starts processing the delayed reference count updates and
 * extent insertions we have queued up so far.  count can be
 * 0, which means to process everything in the tree at the start
 * of the run (but not newly added entries), or it can be some target
 * number you'd like to process.
 *
 * Returns 0 on success or if called with an aborted transaction
 * Returns <0 on error and aborts the transaction
 */


int btrfs_run_delayed_refs(struct btrfs_trans_handle *trans,
			   struct btrfs_fs_info *fs_info, unsigned long count)
{
	struct rb_node *node;
	struct btrfs_delayed_ref_root *delayed_refs;
	struct btrfs_delayed_ref_head *head;
	int ret;
	int run_all = count == (unsigned long)-1;
	bool can_flush_pending_bgs = trans->can_flush_pending_bgs;

	/* We'll clean this up in btrfs_cleanup_transaction */
	if (trans->aborted)
		return 0;

	if (test_bit(BTRFS_FS_CREATING_FREE_SPACE_TREE, &fs_info->flags))
		return 0;

	delayed_refs = &trans->transaction->delayed_refs;
	if (count == 0)
		count = atomic_read(&delayed_refs->num_entries) * 2;

again:
#ifdef SCRAMBLE_DELAYED_REFS
	delayed_refs->run_delayed_start = find_middle(&delayed_refs->root);
#endif
	trans->can_flush_pending_bgs = false;
	ret = __btrfs_run_delayed_refs(trans, fs_info, count);
	if (ret < 0) {
		btrfs_abort_transaction(trans, ret);
		return ret;
	}

	if (run_all) {
		if (!list_empty(&trans->new_bgs))
			btrfs_create_pending_block_groups(trans, fs_info);

		spin_lock(&delayed_refs->lock);
		node = rb_first(&delayed_refs->href_root);
		if (!node) {
			spin_unlock(&delayed_refs->lock);
			goto out;
		}

		while (node) {
			head = rb_entry(node, struct btrfs_delayed_ref_head,
					href_node);
			if (btrfs_delayed_ref_is_head(&head->node)) {
				struct btrfs_delayed_ref_node *ref;

				ref = &head->node;
				atomic_inc(&ref->refs);

				spin_unlock(&delayed_refs->lock);
				/*
                                 * Mutex was contended, block until it's
                                 * released and try again
                                 */
				mutex_lock(&head->mutex);
				mutex_unlock(&head->mutex);

				btrfs_put_delayed_ref(ref);
				cond_resched();
				goto again;
			} else {
				WARN_ON(1);
			}
			node = rb_next(node);
		}
		spin_unlock(&delayed_refs->lock);
		cond_resched();
		goto again;
	}
out:
	assert_qgroups_uptodate(trans);
	trans->can_flush_pending_bgs = can_flush_pending_bgs;
	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
zheng yan zheng yan 106 30.03% 3 16.67%
josef bacik josef bacik 103 29.18% 6 33.33%
chris mason chris mason 85 24.08% 3 16.67%
liu bo liu bo 20 5.67% 1 5.56%
filipe david borba manana filipe david borba manana 19 5.38% 1 5.56%
jeff mahoney jeff mahoney 14 3.97% 2 11.11%
jan schmidt jan schmidt 5 1.42% 1 5.56%
david sterba david sterba 1 0.28% 1 5.56%
Total 353 100.00% 18 100.00%



int btrfs_set_disk_extent_flags(struct btrfs_trans_handle *trans,
				struct btrfs_fs_info *fs_info,
				u64 bytenr, u64 num_bytes, u64 flags,
				int level, int is_data)
{
	struct btrfs_delayed_extent_op *extent_op;
	int ret;

	extent_op = btrfs_alloc_delayed_extent_op();
	if (!extent_op)
		return -ENOMEM;

	extent_op->flags_to_set = flags;
	extent_op->update_flags = true;
	extent_op->update_key = false;
	extent_op->is_data = is_data ? true : false;
	extent_op->level = level;

	ret = btrfs_add_delayed_extent_op(fs_info, trans, bytenr,
					  num_bytes, extent_op);
	if (ret)
		btrfs_free_delayed_extent_op(extent_op);
	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
zheng yan zheng yan 66 58.41% 2 15.38%
chris mason chris mason 25 22.12% 5 38.46%
josef bacik josef bacik 11 9.73% 2 15.38%
david sterba david sterba 4 3.54% 1 7.69%
miao xie miao xie 3 2.65% 1 7.69%
arne jansen arne jansen 2 1.77% 1 7.69%
jeff mahoney jeff mahoney 2 1.77% 1 7.69%
Total 113 100.00% 13 100.00%



static noinline int check_delayed_ref(struct btrfs_trans_handle *trans,
				      struct btrfs_root *root,
				      struct btrfs_path *path,
				      u64 objectid, u64 offset, u64 bytenr)
{
	struct btrfs_delayed_ref_head *head;
	struct btrfs_delayed_ref_node *ref;
	struct btrfs_delayed_data_ref *data_ref;
	struct btrfs_delayed_ref_root *delayed_refs;
	int ret = 0;

	delayed_refs = &trans->transaction->delayed_refs;
	spin_lock(&delayed_refs->lock);
	head = btrfs_find_delayed_ref_head(trans, bytenr);
	if (!head) {
		spin_unlock(&delayed_refs->lock);
		return 0;
	}

	if (!mutex_trylock(&head->mutex)) {
		atomic_inc(&head->node.refs);
		spin_unlock(&delayed_refs->lock);

		btrfs_release_path(path);

		/*
                 * Mutex was contended, block until it's released and let
                 * caller try again
                 */
		mutex_lock(&head->mutex);
		mutex_unlock(&head->mutex);
		btrfs_put_delayed_ref(&head->node);
		return -EAGAIN;
	}
	spin_unlock(&delayed_refs->lock);

	spin_lock(&head->lock);
	list_for_each_entry(ref, &head->ref_list, list) {
		/* If it's a shared ref we know a cross reference exists */
		if (ref->type != BTRFS_EXTENT_DATA_REF_KEY) {
			ret = 1;
			break;
		}

		data_ref = btrfs_delayed_node_to_data_ref(ref);

		/*
                 * If our ref doesn't match the one we're currently looking at
                 * then we have a cross reference.
                 */
		if (data_ref->root != root->root_key.objectid ||
		    data_ref->objectid != objectid ||
		    data_ref->offset != offset) {
			ret = 1;
			break;
		}
	}
	spin_unlock(&head->lock);
	mutex_unlock(&head->mutex);
	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
zheng yan zheng yan 144 54.34% 2 22.22%
chris mason chris mason 66 24.91% 4 44.44%
josef bacik josef bacik 49 18.49% 1 11.11%
qu wenruo qu wenruo 5 1.89% 1 11.11%
david sterba david sterba 1 0.38% 1 11.11%
Total 265 100.00% 9 100.00%



static noinline int check_committed_ref(struct btrfs_trans_handle *trans,
					struct btrfs_root *root,
					struct btrfs_path *path,
					u64 objectid, u64 offset, u64 bytenr)
{
	struct btrfs_fs_info *fs_info = root->fs_info;
	struct btrfs_root *extent_root = fs_info->extent_root;
	struct extent_buffer *leaf;
	struct btrfs_extent_data_ref *ref;
	struct btrfs_extent_inline_ref *iref;
	struct btrfs_extent_item *ei;
	struct btrfs_key key;
	u32 item_size;
	int ret;

	key.objectid = bytenr;
	key.offset = (u64)-1;
	key.type = BTRFS_EXTENT_ITEM_KEY;

	ret = btrfs_search_slot(NULL, extent_root, &key, path, 0, 0);
	if (ret < 0)
		goto out;
	BUG_ON(ret == 0); /* Corruption */

	ret = -ENOENT;
	if (path->slots[0] == 0)
		goto out;

	path->slots[0]--;
	leaf = path->nodes[0];
	btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);

	if (key.objectid != bytenr || key.type != BTRFS_EXTENT_ITEM_KEY)
		goto out;

	ret = 1;
	item_size = btrfs_item_size_nr(leaf, path->slots[0]);
#ifdef BTRFS_COMPAT_EXTENT_TREE_V0
	if (item_size < sizeof(*ei)) {
		WARN_ON(item_size != sizeof(struct btrfs_extent_item_v0));
		goto out;
	}
#endif
	ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item);

	if (item_size != sizeof(*ei) +
	    btrfs_extent_inline_ref_size(BTRFS_EXTENT_DATA_REF_KEY))
		goto out;

	if (btrfs_extent_generation(leaf, ei) <=
	    btrfs_root_last_snapshot(&root->root_item))
		goto out;

	iref = (struct btrfs_extent_inline_ref *)(ei + 1);
	if (btrfs_extent_inline_ref_type(leaf, iref) !=
	    BTRFS_EXTENT_DATA_REF_KEY)
		goto out;

	ref = (struct btrfs_extent_data_ref *)(&iref->offset);
	if (btrfs_extent_refs(leaf, ei) !=
	    btrfs_extent_data_ref_count(leaf, ref) ||
	    btrfs_extent_data_ref_root(leaf, ref) !=
	    root->root_key.objectid ||
	    btrfs_extent_data_ref_objectid(leaf, ref) != objectid ||
	    btrfs_extent_data_ref_offset(leaf, ref) != offset)
		goto out;

	ret = 0;
out:
	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
zheng yan zheng yan 332 81.37% 2 15.38%
chris mason chris mason 57 13.97% 8 61.54%
jeff mahoney jeff mahoney 10 2.45% 2 15.38%
josef bacik josef bacik 9 2.21% 1 7.69%
Total 408 100.00% 13 100.00%



int btrfs_cross_ref_exist(struct btrfs_trans_handle *trans,
			  struct btrfs_root *root,
			  u64 objectid, u64 offset, u64 bytenr)
{
	struct btrfs_path *path;
	int ret;
	int ret2;

	path = btrfs_alloc_path();
	if (!path)
		return -ENOENT;

	do {
		ret = check_committed_ref(trans, root, path, objectid,
					  offset, bytenr);
		if (ret && ret != -ENOENT)
			goto out;

		ret2 = check_delayed_ref(trans, root, path, objectid,
					 offset, bytenr);
	} while (ret2 == -EAGAIN);

	if (ret2 && ret2 != -ENOENT) {
		ret = ret2;
		goto out;
	}

	if (ret != -ENOENT || ret2 != -ENOENT)
		ret = 0;
out:
	btrfs_free_path(path);
	if (root->root_key.objectid == BTRFS_DATA_RELOC_TREE_OBJECTID)
		WARN_ON(ret > 0);
	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
zheng yan zheng yan 119 71.26% 3 33.33%
chris mason chris mason 48 28.74% 6 66.67%
Total 167 100.00% 9 100.00%



static int __btrfs_mod_ref(struct btrfs_trans_handle *trans,
			   struct btrfs_root *root,
			   struct extent_buffer *buf,
			   int full_backref, int inc)
{
	struct btrfs_fs_info *fs_info = root->fs_info;
	u64 bytenr;
	u64 num_bytes;
	u64 parent;
	u64 ref_root;
	u32 nritems;
	struct btrfs_key key;
	struct btrfs_file_extent_item *fi;
	int i;
	int level;
	int ret = 0;
	int (*process_func)(struct btrfs_trans_handle *,
			    struct btrfs_fs_info *,
			    u64, u64, u64, u64, u64, u64);


	if (btrfs_is_testing(fs_info))
		return 0;

	ref_root = btrfs_header_owner(buf);
	nritems = btrfs_header_nritems(buf);
	level = btrfs_header_level(buf);

	if (!test_bit(BTRFS_ROOT_REF_COWS, &root->state) && level == 0)
		return 0;

	if (inc)
		process_func = btrfs_inc_extent_ref;
	else
		process_func = btrfs_free_extent;

	if (full_backref)
		parent = buf->start;
	else
		parent = 0;

	for (i = 0; i < nritems; i++) {
		if (level == 0) {
			btrfs_item_key_to_cpu(buf, &key, i);
			if (key.type != BTRFS_EXTENT_DATA_KEY)
				continue;
			fi = btrfs_item_ptr(buf, i,
					    struct btrfs_file_extent_item);
			if (btrfs_file_extent_type(buf, fi) ==
			    BTRFS_FILE_EXTENT_INLINE)
				continue;
			bytenr = btrfs_file_extent_disk_bytenr(buf, fi);
			if (bytenr == 0)
				continue;

			num_bytes = btrfs_file_extent_disk_num_bytes(buf, fi);
			key.offset -= btrfs_file_extent_offset(buf, fi);
			ret = process_func(trans, fs_info, bytenr, num_bytes,
					   parent, ref_root, key.objectid,
					   key.offset);
			if (ret)
				goto fail;
		} else {
			bytenr = btrfs_node_blockptr(buf, i);
			num_bytes = fs_info->nodesize;
			ret = process_func(trans, fs_info, bytenr, num_bytes,
					   parent, ref_root, level - 1, 0);
			if (ret)
				goto fail;
		}
	}
	return 0;
fail:
	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
zheng yan zheng yan 256 69.75% 2 9.09%
chris mason chris mason 70 19.07% 10 45.45%
jeff mahoney jeff mahoney 16 4.36% 4 18.18%
josef bacik josef bacik 15 4.09% 3 13.64%
miao xie miao xie 7 1.91% 1 4.55%
david sterba david sterba 3 0.82% 2 9.09%
Total 367 100.00% 22 100.00%



int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
		  struct extent_buffer *buf, int full_backref)
{
	return __btrfs_mod_ref(trans, root, buf, full_backref, 1);
}

Contributors
Person Tokens Prop Commits CommitProp
zheng yan zheng yan 23 62.16% 1 14.29%
chris mason chris mason 13 35.14% 5 71.43%
josef bacik josef bacik 1 2.70% 1 14.29%
Total 37 100.00% 7 100.00%



int btrfs_dec_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
		  struct extent_buffer *buf, int full_backref)
{
	return __btrfs_mod_ref(trans, root, buf, full_backref, 0);
}

Contributors
Person Tokens Prop Commits CommitProp
zheng yan zheng yan 32 86.49% 1 50.00%
chris mason chris mason 5 13.51% 1 50.00%
Total 37 100.00% 2 100.00%



static int write_one_cache_group(struct btrfs_trans_handle *trans,
				 struct btrfs_fs_info *fs_info,
				 struct btrfs_path *path,
				 struct btrfs_block_group_cache *cache)
{
	int ret;
	struct btrfs_root *extent_root = fs_info->extent_root;
	unsigned long bi;
	struct extent_buffer *leaf;

	ret = btrfs_search_slot(trans, extent_root, &cache->key, path, 0, 1);
	if (ret) {
		if (ret > 0)
			ret = -ENOENT;
		goto fail;
	}

	leaf = path->nodes[0];
	bi = btrfs_item_ptr_offset(leaf, path->slots[0]);
	write_extent_buffer(leaf, &cache->item, bi, sizeof(cache->item));
	btrfs_mark_buffer_dirty(leaf);
fail:
	btrfs_release_path(path);
	return ret;

}

Contributors
Person Tokens Prop Commits CommitProp
zheng yan zheng yan 89 61.81% 2 14.29%
josef bacik josef bacik 24 16.67% 3 21.43%
chris mason chris mason 21 14.58% 5 35.71%
jeff mahoney jeff mahoney 8 5.56% 3 21.43%
filipe david borba manana filipe david borba manana 2 1.39% 1 7.14%
Total 144 100.00% 14 100.00%


static struct btrfs_block_group_cache *

next_block_group(struct btrfs_fs_info *fs_info,
		 struct btrfs_block_group_cache *cache)
{
	struct rb_node *node;

	spin_lock(&fs_info->block_group_cache_lock);

	/* If our block group was removed, we need a full search. */
	if (RB_EMPTY_NODE(&cache->cache_node)) {
		const u64 next_bytenr = cache->key.objectid + cache->key.offset;

		spin_unlock(&fs_info->block_group_cache_lock);
		btrfs_put_block_group(cache);
		cache = btrfs_lookup_first_block_group(fs_info, next_bytenr); return cache;
	}
	node = rb_next(&cache->cache_node);
	btrfs_put_block_group(cache);
	if (node) {
		cache = rb_entry(node, struct btrfs_block_group_cache,
				 cache_node);
		btrfs_get_block_group(cache);
	} else
		cache = NULL;
	spin_unlock(&fs_info->block_group_cache_lock);
	return cache;
}

Contributors
Person Tokens Prop Commits CommitProp
zheng yan zheng yan 82 58.99% 1 25.00%
filipe david borba manana filipe david borba manana 54 38.85% 1 25.00%
jeff mahoney jeff mahoney 2 1.44% 1 25.00%
josef bacik josef bacik 1 0.72% 1 25.00%
Total 139 100.00% 4 100.00%



static int cache_save_setup(struct btrfs_block_group_cache *block_group,
			    struct btrfs_trans_handle *trans,
			    struct btrfs_path *path)
{
	struct btrfs_fs_info *fs_info = block_group->fs_info;
	struct btrfs_root *root = fs_info->tree_root;
	struct inode *inode = NULL;
	u64 alloc_hint = 0;
	int dcs = BTRFS_DC_ERROR;
	u64 num_pages = 0;
	int retries = 0;
	int ret = 0;

	/*
         * If this block group is smaller than 100 megs don't bother caching the
         * block group.
         */
	if (block_group->key.offset < (100 * SZ_1M)) {
		spin_lock(&block_group->lock);
		block_group->disk_cache_state = BTRFS_DC_WRITTEN;
		spin_unlock(&block_group->lock);
		return 0;
	}

	if (trans->aborted)
		return 0;
again:
	inode = lookup_free_space_inode(root, block_group, path);
	if (IS_ERR(inode) && PTR_ERR(inode) != -ENOENT) {
		ret = PTR_ERR(inode);
		btrfs_release_path(path);
		goto out;
	}

	if (IS_ERR(inode)) {
		BUG_ON(retries);
		retries++;

		if (block_group->ro)
			goto out_free;

		ret = create_free_space_inode(root, trans, block_group, path);
		if (ret)
			goto out_free;
		goto again;
	}

	/* We've already setup this transaction, go ahead and exit */
	if (block_group->cache_generation == trans->transid &&
	    i_size_read(inode)) {
		dcs = BTRFS_DC_SETUP;
		goto out_put;
	}

	/*
         * We want to set the generation to 0, that way if anything goes wrong
         * from here on out we know not to trust this cache when we load up next
         * time.
         */
	BTRFS_I(inode)->generation = 0;
	ret = btrfs_update_inode(trans, root, inode);
	if (ret) {
		/*
                 * So theoretically we could recover from this, simply set the
                 * super cache generation to 0 so we know to invalidate the
                 * cache, but then we'd have to keep track of the block groups
                 * that fail this way so we know we _have_ to reset this cache
                 * before the next commit or risk reading stale cache.  So to
                 * limit our exposure to horrible edge cases lets just abort the
                 * transaction, this only happens in really bad situations
                 * anyway.
                 */
		btrfs_abort_transaction(trans, ret);
		goto out_put;
	}
	WARN_ON(ret);

	if (i_size_read(inode) > 0) {
		ret = btrfs_check_trunc_cache_free_space(fs_info,
					&fs_info->global_block_rsv);
		if (ret)
			goto out_put;

		ret = btrfs_truncate_free_space_cache(root, trans, NULL, inode);
		if (ret)
			goto out_put;
	}

	spin_lock(&block_group->lock);
	if (block_group->cached != BTRFS_CACHE_FINISHED ||
	    !btrfs_test_opt(fs_info, SPACE_CACHE)) {
		/*
                 * don't bother trying to write stuff out _if_
                 * a) we're not cached,
                 * b) we're with nospace_cache mount option.
                 */
		dcs = BTRFS_DC_WRITTEN;
		spin_unlock(&block_group->lock);
		goto out_put;
	}
	spin_unlock(&block_group->lock);

	/*
         * We hit an ENOSPC when setting up the cache in this transaction, just
         * skip doing the setup, we've already cleared the cache so we're safe.
         */
	if (test_bit(BTRFS_TRANS_CACHE_ENOSPC, &trans->transaction->flags)) {
		ret = -ENOSPC;
		goto out_put;
	}

	/*
         * Try to preallocate enough space based on how big the block group is.
         * Keep in mind this has to include any pinned space which could end up
         * taking up quite a bit since it's not folded into the other space
         * cache.
         */
	num_pages = div_u64(block_group->key.offset, SZ_256M);
	if (!num_pages)
		num_pages = 1;

	num_pages *= 16;
	num_pages *= PAGE_SIZE;

	ret = btrfs_check_data_free_space(inode, 0, num_pages);
	if (ret)
		goto out_put;

	ret = btrfs_prealloc_file_range_trans(inode, trans, 0, 0, num_pages,
					      num_pages, num_pages,
					      &alloc_hint);
	/*
         * Our cache requires contiguous chunks so that we don't modify a bunch
         * of metadata or split extents when writing the cache out, which means
         * we can enospc if we are heavily fragmented in addition to just normal
         * out of space conditions.  So if we hit this just skip setting up any
         * other block groups for this transaction, maybe we'll unpin enough
         * space the next time around.
         */
	if (!ret)
		dcs = BTRFS_DC_SETUP;
	else if (ret == -ENOSPC)
		set_bit(BTRFS_TRANS_CACHE_ENOSPC, &trans->transaction->flags);

out_put:
	iput(inode);
out_free:
	btrfs_release_path(path);
out:
	spin_lock(&block_group->lock);
	if (!ret && dcs == BTRFS_DC_SETUP)
		block_group->cache_generation = trans->transid;
	block_group->disk_cache_state = dcs;
	spin_unlock(&block_group->lock);

	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
josef bacik josef bacik 498 87.68% 7 31.82%
zheng yan zheng yan 19 3.35% 1 4.55%
miao xie miao xie 18 3.17% 1 4.55%
jeff mahoney jeff mahoney 11 1.94% 3 13.64%
liu bo liu bo 8 1.41% 1 4.55%
chris mason chris mason 5 0.88% 3 13.64%
david sterba david sterba 2 0.35% 1 4.55%
dongsheng yang dongsheng yang 2 0.35% 1 4.55%
qu wenruo qu wenruo 2 0.35% 2 9.09%
byongho lee byongho lee 2 0.35% 1 4.55%
kirill a. shutemov kirill a. shutemov 1 0.18% 1 4.55%
Total 568 100.00% 22 100.00%



int btrfs_setup_space_cache(struct btrfs_trans_handle *trans,
			    struct btrfs_fs_info *fs_info)
{
	struct btrfs_block_group_cache *cache, *tmp;
	struct btrfs_transaction *cur_trans = trans->transaction;
	struct btrfs_path *path;

	if (list_empty(&cur_trans->dirty_bgs) ||
	    !btrfs_test_opt(fs_info, SPACE_CACHE))
		return 0;

	path = btrfs_alloc_path();
	if (!path)
		return -ENOMEM;

	/* Could add new block groups, use _safe just in case */
	list_for_each_entry_safe(cache, tmp, &cur_trans->dirty_bgs,
				 dirty_list) {
		if (cache->disk_cache_state == BTRFS_DC_CLEAR)
			cache_save_setup(cache, trans, path);
	}

	btrfs_free_path(path);
	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
chris mason chris mason 56 50.91% 1 20.00%
josef bacik josef bacik 47 42.73% 1 20.00%
jeff mahoney jeff mahoney 7 6.36% 3 60.00%
Total 110 100.00% 5 100.00%

/*
 * transaction commit does final block group cache writeback during a
 * critical section where nothing is allowed to change the FS.  This is
 * required in order for the cache to actually match the block group,
 * but can introduce a lot of latency into the commit.
 *
 * So, btrfs_start_dirty_block_groups is here to kick off block group
 * cache IO.  There's a chance we'll have to redo some of it if the
 * block group changes again during the commit, but it greatly reduces
 * the commit latency by getting rid of the easy block groups while
 * we're still allowing others to join the commit.
 */


int btrfs_start_dirty_block_groups(struct btrfs_trans_handle *trans,
				   struct btrfs_fs_info *fs_info)
{
	struct btrfs_block_group_cache *cache;
	struct btrfs_transaction *cur_trans = trans->transaction;
	int ret = 0;
	int should_put;
	struct btrfs_path *path = NULL;
	LIST_HEAD(dirty);
	struct list_head *io = &cur_trans->io_bgs;
	int num_started = 0;
	int loops = 0;

	spin_lock(&cur_trans->dirty_bgs_lock);
	if (list_empty(&cur_trans->dirty_bgs)) {
		spin_unlock(&cur_trans->dirty_bgs_lock);
		return 0;
	}
	list_splice_init(&cur_trans->dirty_bgs, &dirty);
	spin_unlock(&cur_trans->dirty_bgs_lock);

again:
	/*
         * make sure all the block groups on our dirty list actually
         * exist
         */
	btrfs_create_pending_block_groups(trans, fs_info);

	if (!path) {
		path = btrfs_alloc_path();
		if (!path)
			return -ENOMEM;
	}

	/*
         * cache_write_mutex is here only to save us from balance or automatic
         * removal of empty block groups deleting this block group while we are
         * writing out the cache
         */
	mutex_lock(&trans->transaction->cache_write_mutex);
	while (!list_empty(&dirty)) {
		cache = list_first_entry(&dirty,
					 struct btrfs_block_group_cache,
					 dirty_list);
		/*
                 * this can happen if something re-dirties a block
                 * group that is already under IO.  Just wait for it to
                 * finish and then do it all again
                 */
		if (!list_empty(&cache->io_list)) {
			list_del_init(&cache->io_list);
			btrfs_wait_cache_io(trans, cache, path);
			btrfs_put_block_group(cache);
		}


		/*
                 * btrfs_wait_cache_io uses the cache->dirty_list to decide
                 * if it should update the cache_state.  Don't delete
                 * until after we wait.
                 *
                 * Since we're not running in the commit critical section
                 * we need the dirty_bgs_lock to protect from update_block_group
                 */
		spin_lock(&cur_trans->dirty_bgs_lock);
		list_del_init(&cache->dirty_list);
		spin_unlock(&cur_trans->dirty_bgs_lock);

		should_put = 1;

		cache_save_setup(cache, trans, path);

		if (cache->disk_cache_state == BTRFS_DC_SETUP) {
			cache->io_ctl.inode = NULL;
			ret = btrfs_write_out_cache(fs_info, trans,
						    cache, path);
			if (ret == 0 && cache->io_ctl.inode) {
				num_started++;
				should_put = 0;

				/*
                                 * the cache_write_mutex is protecting
                                 * the io_list
                                 */
				list_add_tail(&cache->io_list, io);
			} else {
				/*
                                 * if we failed to write the cache, the
                                 * generation will be bad and life goes on
                                 */
				ret = 0;
			}
		}
		if (!ret) {
			ret = write_one_cache_group(trans, fs_info,
						    path, cache);
			/*
                         * Our block group might still be attached to the list
                         * of new block groups in the transaction handle of some
                         * other task (struct btrfs_trans_handle->new_bgs). This
                         * means its block group item isn't yet in the extent
                         * tree. If this happens ignore the error, as we will
                         * try again later in the critical section of the
                         * transaction commit.
                         */
			if (ret == -ENOENT) {
				ret = 0;
				spin_lock(&cur_trans->dirty_bgs_lock);
				if (list_empty(&cache->dirty_list)) {
					list_add_tail(&cache->dirty_list,
						      &cur_trans->dirty_bgs);
					btrfs_get_block_group(cache);
				}
				spin_unlock(&cur_trans->dirty_bgs_lock);
			} else if (ret) {
				btrfs_abort_transaction(trans, ret);
			}
		}

		/* if its not on the io list, we need to put the block group */
		if (should_put)
			btrfs_put_block_group(cache);

		if (ret)
			break;

		/*
                 * Avoid blocking other tasks for too long. It might even save
                 * us from writing caches for block groups that are going to be
                 * removed.
                 */
		mutex_unlock(&trans->transaction->cache_write_mutex);
		mutex_lock(&trans->transaction->cache_write_mutex);
	}
	mutex_unlock(&trans->transaction->cache_write_mutex);

	/*
         * go through delayed refs for all the stuff we've just kicked off
         * and then loop back (just once)
         */
	ret = btrfs_run_delayed_refs(trans, fs_info, 0);
	if (!ret && loops == 0) {
		loops++;
		spin_lock(&cur_trans->dirty_bgs_lock);
		list_splice_init(&cur_trans->dirty_bgs, &dirty);
		/*
                 * dirty_bgs_lock protects us from concurrent block group
                 * deletes too (not just cache_write_mutex).
                 */
		if (!list_empty(&dirty)) {
			spin_unlock(&cur_trans->dirty_bgs_lock);
			goto again;
		}
		spin_unlock(&cur_trans->dirty_bgs_lock);
	} else if (ret < 0) {
		btrfs_cleanup_dirty_bgs(cur_trans, fs_info);
	}

	btrfs_free_path(path);
	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
chris mason chris mason 369 64.74% 1 12.50%
filipe david borba manana filipe david borba manana 150 26.32% 2 25.00%
josef bacik josef bacik 25 4.39% 1 12.50%
liu bo liu bo 15 2.63% 1 12.50%
jeff mahoney jeff mahoney 11 1.93% 3 37.50%
Total 570 100.00% 8 100.00%



int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans,
				   struct btrfs_fs_info *fs_info)
{
	struct btrfs_block_group_cache *cache;
	struct btrfs_transaction *cur_trans = trans->transaction;
	int ret = 0;
	int should_put;
	struct btrfs_path *path;
	struct list_head *io = &cur_trans->io_bgs;
	int num_started = 0;

	path = btrfs_alloc_path();
	if (!path)
		return -ENOMEM;

	/*
         * Even though we are in the critical section of the transaction commit,
         * we can still have concurrent tasks adding elements to this
         * transaction's list of dirty block groups. These tasks correspond to
         * endio free space workers started when writeback finishes for a
         * space cache, which run inode.c:btrfs_finish_ordered_io(), and can
         * allocate new block groups as a result of COWing nodes of the root
         * tree when updating the free space inode. The writeback for the space
         * caches is triggered by an earlier call to
         * btrfs_start_dirty_block_groups() and iterations of the following
         * loop.
         * Also we want to do the cache_save_setup first and then run the
         * delayed refs to make sure we have the best chance at doing this all
         * in one shot.
         */
	spin_lock(&cur_trans->dirty_bgs_lock);
	while (!list_empty(&cur_trans->dirty_bgs)) {
		cache = list_first_entry(&cur_trans->dirty_bgs,
					 struct btrfs_block_group_cache,
					 dirty_list);

		/*
                 * this can happen if cache_save_setup re-dirties a block
                 * group that is already under IO.  Just wait for it to
                 * finish and then do it all again
                 */
		if (!list_empty(&cache->io_list)) {
			spin_unlock(&cur_trans->dirty_bgs_lock);
			list_del_init(&cache->io_list);
			btrfs_wait_cache_io(trans, cache, path);
			btrfs_put_block_group(cache);
			spin_lock(&cur_trans->dirty_bgs_lock);
		}

		/*
                 * don't remove from the dirty list until after we've waited
                 * on any pending IO
                 */
		list_del_init(&cache->dirty_list);
		spin_unlock(&cur_trans->dirty_bgs_lock);
		should_put = 1;

		cache_save_setup(cache, trans, path);

		if (!ret)
			ret = btrfs_run_delayed_refs(trans, fs_info,
						     (unsigned long) -1);

		if (!ret && cache->disk_cache_state == BTRFS_DC_SETUP) {
			cache->io_ctl.inode = NULL;
			ret = btrfs_write_out_cache(fs_info, trans,
						    cache, path);
			if (ret == 0 && cache->io_ctl.inode) {
				num_started++;
				should_put = 0;
				list_add_tail(&cache->io_list, io);
			} else {
				/*
                                 * if we failed to write the cache, the
                                 * generation will be bad and life goes on
                                 */
				ret = 0;
			}
		}
		if (!ret) {
			ret = write_one_cache_group(trans, fs_info,
						    path, cache);
			/*
                         * One of the free space endio workers might have
                         * created a new block group while updating a free space
                         * cache's inode (at inode.c:btrfs_finish_ordered_io())
                         * and hasn't released its transaction handle yet, in
                         * which case the new block group is still attached to
                         * its transaction handle and its creation has not
                         * finished yet (no block group item in the extent tree
                         * yet, etc). If this is the case, wait for all free
                         * space endio workers to finish and retry. This is a
                         * a very rare case so no need for a more efficient and
                         * complex approach.
                         */
			if (ret == -ENOENT) {
				wait_event(cur_trans->writer_wait,
				   atomic_read(&cur_trans->num_writers) == 1);
				ret = write_one_cache_group(trans, fs_info,
							    path, cache);
			}
			if (ret)
				btrfs_abort_transaction(trans, ret);
		}

		/* if its not on the io list, we need to put the block group */
		if (should_put)
			btrfs_put_block_group(cache);
		spin_lock(&cur_trans->dirty_bgs_lock);
	}
	spin_unlock(&cur_trans->dirty_bgs_lock);

	while (!list_empty(io)) {
		cache = list_first_entry(io, struct btrfs_block_group_cache,
					 io_list);
		list_del_init(&cache->io_list);
		btrfs_wait_cache_io(trans, cache, path);
		btrfs_put_block_group(cache);
	}

	btrfs_free_path(path);
	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
chris mason chris mason 167 38.57% 5 26.32%
josef bacik josef bacik 106 24.48% 5 26.32%
filipe david borba manana filipe david borba manana 101 23.33% 3 15.79%
zheng yan zheng yan 46 10.62% 2 10.53%
jeff mahoney jeff mahoney 13 3.00% 4 21.05%
Total 433 100.00% 19 100.00%



int btrfs_extent_readonly(struct btrfs_fs_info *fs_info, u64 bytenr)
{
	struct btrfs_block_group_cache *block_group;
	int readonly = 0;

	block_group = btrfs_lookup_block_group(fs_info, bytenr);
	if (!block_group || block_group->ro)
		readonly = 1;
	if (block_group)
		btrfs_put_block_group(block_group);
	return readonly;
}

Contributors
Person Tokens Prop Commits CommitProp
zheng yan zheng yan 47 82.46% 1 20.00%
chris mason chris mason 5 8.77% 2 40.00%
josef bacik josef bacik 3 5.26% 1 20.00%
jeff mahoney jeff mahoney 2 3.51% 1 20.00%
Total 57 100.00% 5 100.00%



bool btrfs_inc_nocow_writers(struct btrfs_fs_info *fs_info, u64 bytenr)
{
	struct btrfs_block_group_cache *bg;
	bool ret = true;

	bg = btrfs_lookup_block_group(fs_info, bytenr);
	if (!bg)
		return false;

	spin_lock(&bg->lock);
	if (bg->ro)
		ret = false;
	else
		atomic_inc(&bg->nocow_writers);
	spin_unlock(&bg->lock);

	/* no put on block group, done by btrfs_dec_nocow_writers */
	if (!ret)
		btrfs_put_block_group(bg);

	return ret;

}

Contributors
Person Tokens Prop Commits CommitProp
filipe david borba manana filipe david borba manana 89 100.00% 1 100.00%
Total 89 100.00% 1 100.00%



void btrfs_dec_nocow_writers(struct btrfs_fs_info *fs_info, u64 bytenr)
{
	struct btrfs_block_group_cache *bg;

	bg = btrfs_lookup_block_group(fs_info, bytenr);
	ASSERT(bg);
	if (atomic_dec_and_test(&bg->nocow_writers))
		wake_up_atomic_t(&bg->nocow_writers);
	/*
         * Once for our lookup and once for the lookup done by a previous call
         * to btrfs_inc_nocow_writers()
         */
	btrfs_put_block_group(bg);
	btrfs_put_block_group(bg);
}

Contributors
Person Tokens Prop Commits CommitProp
filipe david borba manana filipe david borba manana 61 100.00% 1 100.00%
Total 61 100.00% 1 100.00%



static int btrfs_wait_nocow_writers_atomic_t(atomic_t *a)
{
	schedule();
	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
filipe david borba manana filipe david borba manana 16 100.00% 1 100.00%
Total 16 100.00% 1 100.00%



void btrfs_wait_nocow_writers(struct btrfs_block_group_cache *bg)
{
	wait_on_atomic_t(&bg->nocow_writers,
			 btrfs_wait_nocow_writers_atomic_t,
			 TASK_UNINTERRUPTIBLE);
}

Contributors
Person Tokens Prop Commits CommitProp
filipe david borba manana filipe david borba manana 22 100.00% 1 100.00%
Total 22 100.00% 1 100.00%



static const char *alloc_name(u64 flags)
{
	switch (flags) {
	case BTRFS_BLOCK_GROUP_METADATA|BTRFS_BLOCK_GROUP_DATA:
		return "mixed";
	case BTRFS_BLOCK_GROUP_METADATA:
		return "metadata";
	case BTRFS_BLOCK_GROUP_DATA:
		return "data";
	case BTRFS_BLOCK_GROUP_SYSTEM:
		return "system";
	default:
		WARN_ON(1);
		return "invalid-combination";
	};
}

Contributors
Person Tokens Prop Commits CommitProp
jeff mahoney jeff mahoney 53 100.00% 1 100.00%
Total 53 100.00% 1 100.00%



static int update_space_info(struct btrfs_fs_info *info, u64 flags,
			     u64 total_bytes, u64 bytes_used,
			     u64 bytes_readonly,
			     struct btrfs_space_info **space_info)
{
	struct btrfs_space_info *found;
	int i;
	int factor;
	int ret;

	if (flags & (BTRFS_BLOCK_GROUP_DUP | BTRFS_BLOCK_GROUP_RAID1 |
		     BTRFS_BLOCK_GROUP_RAID10))
		factor = 2;
	else
		factor = 1;

	found = __find_space_info(info, flags);
	if (found) {
		spin_lock(&found->lock);
		found->total_bytes += total_bytes;
		found->disk_total += total_bytes * factor;
		found->bytes_used += bytes_used;
		found->disk_used += bytes_used * factor;
		found->bytes_readonly += bytes_readonly;
		if (total_bytes > 0)
			found->full = 0;
		space_info_add_new_bytes(info, found, total_bytes -
					 bytes_used - bytes_readonly);
		spin_unlock(&found->lock);
		*space_info = found;
		return 0;
	}
	found = kzalloc(sizeof(*found), GFP_NOFS);
	if (!found)
		return -ENOMEM;

	ret = percpu_counter_init(&found->total_bytes_pinned, 0, GFP_KERNEL);
	if (ret) {
		kfree(found);
		return ret;
	}

	for (i = 0; i < BTRFS_NR_RAID_TYPES; i++)
		INIT_LIST_HEAD(&found->block_groups[i]);
	init_rwsem(&found->groups_sem);
	spin_lock_init(&found->lock);
	found->flags = flags & BTRFS_BLOCK_GROUP_TYPE_MASK;
	found->total_bytes = total_bytes;
	found->disk_total = total_bytes * factor;
	found->bytes_used = bytes_used;
	found->disk_used = bytes_used * factor;
	found->bytes_pinned = 0;
	found->bytes_reserved = 0;
	found->bytes_readonly = bytes_readonly;
	found->bytes_may_use = 0;
	found->full = 0;
	found->max_extent_size = 0;
	found->force_alloc = CHUNK_ALLOC_NO_FORCE;
	found->chunk_alloc = 0;
	found->flush = 0;
	init_waitqueue_head(&found->wait);
	INIT_LIST_HEAD(&found->ro_bgs);
	INIT_LIST_HEAD(&found->tickets);
	INIT_LIST_HEAD(&found->priority_tickets);

	ret = kobject_init_and_add(&found->kobj, &space_info_ktype,
				    info->space_info_kobj, "%s",
				    alloc_name(found->flags));
	if (ret) {
		kfree(found);
		return ret;
	}

	*space_info = found;
	list_add_rcu(&found->list, &info->space_info);
	if (flags & BTRFS_BLOCK_GROUP_DATA)
		info->data_sinfo = found;

	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
zheng yan zheng yan 207 46.31% 3 11.11%
josef bacik josef bacik 131 29.31% 12 44.44%
chris mason chris mason 47 10.51% 7 25.93%
jeff mahoney jeff mahoney 41 9.17% 1 3.70%
li zefan li zefan 12 2.68% 1 3.70%
filipe david borba manana filipe david borba manana 6 1.34% 1 3.70%
tejun heo tejun heo 2 0.45% 1 3.70%
ilya dryomov ilya dryomov 1 0.22% 1 3.70%
Total 447 100.00% 27 100.00%



static void set_avail_alloc_bits(struct btrfs_fs_info *fs_info, u64 flags)
{
	u64 extra_flags = chunk_to_extended(flags) &
				BTRFS_EXTENDED_PROFILE_MASK;

	write_seqlock(&fs_info->profiles_lock);
	if (flags & BTRFS_BLOCK_GROUP_DATA)
		fs_info->avail_data_alloc_bits |= extra_flags;
	if (flags & BTRFS_BLOCK_GROUP_METADATA)
		fs_info->avail_metadata_alloc_bits |= extra_flags;
	if (flags & BTRFS_BLOCK_GROUP_SYSTEM)
		fs_info->avail_system_alloc_bits |= extra_flags;
	write_sequnlock(&fs_info->profiles_lock);
}

Contributors
Person Tokens Prop Commits CommitProp
zheng yan zheng yan 47 61.84% 2 28.57%
miao xie miao xie 16 21.05% 1 14.29%
chris mason chris mason 8 10.53% 2 28.57%
ilya dryomov ilya dryomov 4 5.26% 1 14.29%
josef bacik josef bacik 1 1.32% 1 14.29%
Total 76 100.00% 7 100.00%

/*
 * returns target flags in extended format or 0 if restripe for this
 * chunk_type is not in progress
 *
 * should be called with either volume_mutex or balance_lock held
 */


static u64 get_restripe_target(struct btrfs_fs_info *fs_info, u64 flags)
{
	struct btrfs_balance_control *bctl = fs_info->balance_ctl;
	u64 target = 0;

	if (!bctl)
		return 0;

	if (flags & BTRFS_BLOCK_GROUP_DATA &&
	    bctl->data.flags & BTRFS_BALANCE_ARGS_CONVERT) {
		target = BTRFS_BLOCK_GROUP_DATA | bctl->data.target;
	} else if (flags & BTRFS_BLOCK_GROUP_SYSTEM &&
		   bctl->sys.flags & BTRFS_BALANCE_ARGS_CONVERT) {
		target = BTRFS_BLOCK_GROUP_SYSTEM | bctl->sys.target;
	} else if (flags & BTRFS_BLOCK_GROUP_METADATA &&
		   bctl->meta.flags & BTRFS_BALANCE_ARGS_CONVERT) {
		target = BTRFS_BLOCK_GROUP_METADATA | bctl->meta.target;
	}

	return target;
}

Contributors
Person Tokens Prop Commits CommitProp
ilya dryomov ilya dryomov 106 89.08% 2 66.67%
zheng yan zheng yan 13 10.92% 1 33.33%
Total 119 100.00% 3 100.00%

/*
 * @flags: available profiles in extended format (see ctree.h)
 *
 * Returns reduced profile in chunk format.  If profile changing is in
 * progress (either running or paused) picks the target profile (if it's
 * already available), otherwise falls back to plain reducing.
 */


static u64 btrfs_reduce_alloc_profile(struct btrfs_fs_info *fs_info, u64 flags)
{
	u64 num_devices = fs_info->fs_devices->rw_devices;
	u64 target;
	u64 raid_type;
	u64 allowed = 0;

	/*
         * see if restripe for this chunk_type is in progress, if so
         * try to reduce to the target profile
         */
	spin_lock(&fs_info->balance_lock);
	target = get_restripe_target(fs_info, flags);
	if (target) {
		/* pick target profile only if it's already available */
		if ((flags & target) & BTRFS_EXTENDED_PROFILE_MASK) {
			spin_unlock(&fs_info->balance_lock);
			return extended_to_chunk(target);
		}
	}
	spin_unlock(&fs_info->balance_lock);

	/* First, mask out the RAID levels which aren't possible */
	for (raid_type = 0; raid_type < BTRFS_NR_RAID_TYPES; raid_type++) {
		if (num_devices >= btrfs_raid_array[raid_type].devs_min)
			allowed |= btrfs_raid_group[raid_type];
	}
	allowed &= flags;

	if (allowed & BTRFS_BLOCK_GROUP_RAID6)
		allowed = BTRFS_BLOCK_GROUP_RAID6;
	else if (allowed & BTRFS_BLOCK_GROUP_RAID5)
		allowed = BTRFS_BLOCK_GROUP_RAID5;
	else if (allowed & BTRFS_BLOCK_GROUP_RAID10)
		allowed = BTRFS_BLOCK_GROUP_RAID10;
	else if (allowed & BTRFS_BLOCK_GROUP_RAID1)
		allowed = BTRFS_BLOCK_GROUP_RAID1;
	else if (allowed & BTRFS_BLOCK_GROUP_RAID0)
		allowed = BTRFS_BLOCK_GROUP_RAID0;

	flags &= ~BTRFS_BLOCK_GROUP_PROFILE_MASK;

	return extended_to_chunk(flags | allowed);
}

Contributors
Person Tokens Prop Commits CommitProp
ilya dryomov ilya dryomov 80 40.40% 3 25.00%
zhao lei zhao lei 51 25.76% 1 8.33%
david woodhouse david woodhouse 36 18.18% 1 8.33%
zheng yan zheng yan 17 8.59% 2 16.67%
chris mason chris mason 7 3.54% 2 16.67%
jeff mahoney jeff mahoney 6 3.03% 2 16.67%
eric sandeen eric sandeen 1 0.51% 1 8.33%
Total 198 100.00% 12 100.00%



static u64 get_alloc_profile(struct btrfs_fs_info *fs_info, u64 orig_flags)
{
	unsigned seq;
	u64 flags;

	do {
		flags = orig_flags;
		seq = read_seqbegin(&fs_info->profiles_lock);

		if (flags & BTRFS_BLOCK_GROUP_DATA)
			flags |= fs_info->avail_data_alloc_bits;
		else if (flags & BTRFS_BLOCK_GROUP_SYSTEM)
			flags |= fs_info->avail_system_alloc_bits;
		else if (flags & BTRFS_BLOCK_GROUP_METADATA)
			flags |= fs_info->avail_metadata_alloc_bits;
	} while (read_seqretry(&fs_info->profiles_lock, seq));

	return btrfs_reduce_alloc_profile(fs_info, flags);
}

Contributors
Person Tokens Prop Commits CommitProp
zheng yan zheng yan 38 39.58% 4 40.00%
miao xie miao xie 29 30.21% 1 10.00%
chris mason chris mason 11 11.46% 1 10.00%
filipe david borba manana filipe david borba manana 8 8.33% 1 10.00%
josef bacik josef bacik 7 7.29% 2 20.00%
jeff mahoney jeff mahoney 3 3.12% 1 10.00%
Total 96 100.00% 10 100.00%



u64 btrfs_get_alloc_profile(struct btrfs_root *root, int data)
{
	struct btrfs_fs_info *fs_info = root->fs_info;
	u64 flags;
	u64 ret;

	if (data)
		flags = BTRFS_BLOCK_GROUP_DATA;
	else if (root == fs_info->chunk_root)
		flags = BTRFS_BLOCK_GROUP_SYSTEM;
	else
		flags = BTRFS_BLOCK_GROUP_METADATA;

	ret = get_alloc_profile(fs_info, flags);
	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
zheng yan zheng yan 38 57.58% 2 25.00%
jeff mahoney jeff mahoney 10 15.15% 2 25.00%
david woodhouse david woodhouse 8 12.12% 1 12.50%
chris mason chris mason 6 9.09% 2 25.00%
josef bacik josef bacik 4 6.06% 1 12.50%
Total 66 100.00% 8 100.00%



int btrfs_alloc_data_chunk_ondemand(struct inode *inode, u64 bytes)
{
	struct btrfs_space_info *data_sinfo;
	struct btrfs_root *root = BTRFS_I(inode)->root;
	struct btrfs_fs_info *fs_info = root->fs_info;
	u64 used;
	int ret = 0;
	int need_commit = 2;
	int have_pinned_space;

	/* make sure bytes are sectorsize aligned */
	bytes = ALIGN(bytes, fs_info->sectorsize);

	if (btrfs_is_free_space_inode(inode)) {
		need_commit = 0;
		ASSERT(current->journal_info);
	}

	data_sinfo = fs_info->data_sinfo;
	if (!data_sinfo)
		goto alloc;

again:
	/* make sure we have enough space to handle the data first */
	spin_lock(&data_sinfo->lock);
	used = data_sinfo->bytes_used + data_sinfo->bytes_reserved +
		data_sinfo->bytes_pinned + data_sinfo->bytes_readonly +
		data_sinfo->bytes_may_use;

	if (used + bytes > data_sinfo->total_bytes) {
		struct btrfs_trans_handle *trans;

		/*
                 * if we don't have enough free bytes in this space then we need
                 * to alloc a new chunk.
                 */
		if (!data_sinfo->full) {
			u64 alloc_target;

			data_sinfo->force_alloc = CHUNK_ALLOC_FORCE;
			spin_unlock(&data_sinfo->lock);
alloc:
			alloc_target = btrfs_get_alloc_profile(root, 1);
			/*
                         * It is ugly that we don't call nolock join
                         * transaction for the free space inode case here.
                         * But it is safe because we only do the data space
                         * reservation for the free space cache in the
                         * transaction context, the common join transaction
                         * just increase the counter of the current transaction
                         * handler, doesn't try to acquire the trans_lock of
                         * the fs.
                         */
			trans = btrfs_join_transaction(root);
			if (IS_ERR(trans))
				return PTR_ERR(trans);

			ret = do_chunk_alloc(trans, fs_info, alloc_target,
					     CHUNK_ALLOC_NO_FORCE);
			btrfs_end_transaction(trans);
			if (ret < 0) {
				if (ret != -ENOSPC)
					return ret;
				else {
					have_pinned_space = 1;
					goto commit_trans;
				}
			}

			if (!data_sinfo)
				data_sinfo = fs_info->data_sinfo;

			goto again;
		}

		/*
                 * If we don't have enough pinned space to deal with this
                 * allocation, and no removed chunk in current transaction,
                 * don't bother committing the transaction.
                 */
		have_pinned_space = percpu_counter_compare(
			&data_sinfo->total_bytes_pinned,
			used + bytes - data_sinfo->total_bytes);
		spin_unlock(&data_sinfo->lock);

		/* commit the current transaction and try again */
commit_trans:
		if (need_commit &&
		    !atomic_read(&fs_info->open_ioctl_trans)) {
			need_commit--;

			if (need_commit > 0) {
				btrfs_start_delalloc_roots(fs_info, 0, -1);
				btrfs_wait_ordered_roots(fs_info, -1, 0,
							 (u64)-1);
			}

			trans = btrfs_join_transaction(root);
			if (IS_ERR(trans))
				return PTR_ERR(trans);
			if (have_pinned_space >= 0 ||
			    test_bit(BTRFS_TRANS_HAVE_FREE_BGS,
				     &trans->transaction->flags) ||
			    need_commit > 0) {
				ret = btrfs_commit_transaction(trans);
				if (ret)
					return ret;
				/*
                                 * The cleaner kthread might still be doing iput
                                 * operations. Wait for it to finish so that
                                 * more space is released.
                                 */
				mutex_lock(&fs_info->cleaner_delayed_iput_mutex);
				mutex_unlock(&fs_info->cleaner_delayed_iput_mutex);
				goto again;
			} else {
				btrfs_end_transaction(trans);
			}
		}

		trace_btrfs_space_reservation(fs_info,
					      "space_info:enospc",
					      data_sinfo->flags, bytes, 1);
		return -ENOSPC;
	}
	data_sinfo->bytes_may_use += bytes;
	trace_btrfs_space_reservation(fs_info, "space_info",
				      data_sinfo->flags, bytes, 1);
	spin_unlock(&data_sinfo->lock);

	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
zheng yan zheng yan 196 40.08% 4 12.12%
josef bacik josef bacik 97 19.84% 8 24.24%
zhao lei zhao lei 90 18.40% 6 18.18%
chris mason chris mason 28 5.73% 3 9.09%
miao xie miao xie 24 4.91% 2 6.06%
jeff mahoney jeff mahoney 17 3.48% 2 6.06%
li zefan li zefan 16 3.27% 2 6.06%
filipe david borba manana filipe david borba manana 13 2.66% 2 6.06%
qu wenruo qu wenruo 5 1.02% 2 6.06%
liu bo liu bo 2 0.41% 1 3.03%
dongsheng yang dongsheng yang 1 0.20% 1 3.03%
Total 489 100.00% 33 100.00%

/*
 * New check_data_free_space() with ability for precious data reservation
 * Will replace old btrfs_check_data_free_space(), but for patch split,
 * add a new function first and then replace it.
 */


int btrfs_check_data_free_space(struct inode *inode, u64 start, u64 len)
{
	struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
	int ret;

	/* align the range */
	len = round_up(start + len, fs_info->sectorsize) -
	      round_down(start, fs_info->sectorsize);
	start = round_down(start, fs_info->sectorsize);

	ret = btrfs_alloc_data_chunk_ondemand(inode, len);
	if (ret < 0)
		return ret;

	/* Use new btrfs_qgroup_reserve_data to reserve precious data space. */
	ret = btrfs_qgroup_reserve_data(inode, start, len);
	if (ret)
		btrfs_free_reserved_data_space_noquota(inode, start, len);
	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
qu wenruo qu wenruo 86 77.48% 1 25.00%
josef bacik josef bacik 14 12.61% 1 25.00%
jeff mahoney jeff mahoney 11 9.91% 2 50.00%
Total 111 100.00% 4 100.00%

/*
 * Called if we need to clear a data reservation for this inode
 * Normally in a error case.
 *
 * This one will *NOT* use accurate qgroup reserved space API, just for case
 * which we can't sleep and is sure it won't affect qgroup reserved space.
 * Like clear_bit_hook().
 */


void btrfs_free_reserved_data_space_noquota(struct inode *inode, u64 start,
					    u64 len)
{
	struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
	struct btrfs_space_info *data_sinfo;

	/* Make sure the range is aligned to sectorsize */
	len = round_up(start + len, fs_info->sectorsize) -
	      round_down(start, fs_info->sectorsize);
	start = round_down(start, fs_info->sectorsize);

	data_sinfo = fs_info->data_sinfo;
	spin_lock(&data_sinfo->lock);
	if (WARN_ON(data_sinfo->bytes_may_use < len))
		data_sinfo->bytes_may_use = 0;
	else
		data_sinfo->bytes_may_use -= len;
	trace_btrfs_space_reservation(fs_info, "space_info",
				      data_sinfo->flags, len, 0);
	spin_unlock(&data_sinfo->lock);
}

Contributors
Person Tokens Prop Commits CommitProp
qu wenruo qu wenruo 109 85.16% 2 28.57%
jeff mahoney jeff mahoney 11 8.59% 2 28.57%
josef bacik josef bacik 4 3.12% 1 14.29%
zheng yan zheng yan 2 1.56% 1 14.29%
chris mason chris mason 2 1.56% 1 14.29%
Total 128 100.00% 7 100.00%

/*
 * Called if we need to clear a data reservation for this inode
 * Normally in a error case.
 *
 * This one will handle the per-inode data rsv map for accurate reserved
 * space framework.
 */


void btrfs_free_reserved_data_space(struct inode *inode, u64 start, u64 len)
{
	struct btrfs_root *root = BTRFS_I(inode)->root;

	/* Make sure the range is aligned to sectorsize */
	len = round_up(start + len, root->fs_info->sectorsize) -
	      round_down(start, root->fs_info->sectorsize);
	start = round_down(start, root->fs_info->sectorsize);

	btrfs_free_reserved_data_space_noquota(inode, start, len);
	btrfs_qgroup_free_data(inode, start, len);
}

Contributors
Person Tokens Prop Commits CommitProp
jeff mahoney jeff mahoney 52 60.47% 2 50.00%
qu wenruo qu wenruo 34 39.53% 2 50.00%
Total 86 100.00% 4 100.00%



static void force_metadata_allocation(struct btrfs_fs_info *info)
{
	struct list_head *head = &info->space_info;
	struct btrfs_space_info *found;

	rcu_read_lock();
	list_for_each_entry_rcu(found, head, list) {
		if (found->flags & BTRFS_BLOCK_GROUP_METADATA)
			found->force_alloc = CHUNK_ALLOC_FORCE;
	}
	rcu_read_unlock();
}

Contributors
Person Tokens Prop Commits CommitProp
zheng yan zheng yan 29 51.79% 2 40.00%
josef bacik josef bacik 25 44.64% 1 20.00%
chris mason chris mason 2 3.57% 2 40.00%
Total 56 100.00% 5 100.00%



static inline u64 calc_global_rsv_need_space(struct btrfs_block_rsv *global)
{
	return (global->size << 1);
}

Contributors
Person Tokens Prop Commits CommitProp
miao xie miao xie 21 100.00% 1 100.00%
Total 21 100.00% 1 100.00%



static int should_alloc_chunk(struct btrfs_fs_info *fs_info,
			      struct btrfs_space_info *sinfo, int force)
{
	struct btrfs_block_rsv *global_rsv = &fs_info->global_block_rsv;
	u64 num_bytes = sinfo->total_bytes - sinfo->bytes_readonly;
	u64 num_allocated = sinfo->bytes_used + sinfo->bytes_reserved;
	u64 thresh;

	if (force == CHUNK_ALLOC_FORCE)
		return 1;

	/*
         * We need to take into account the global rsv because for all intents
         * and purposes it's used space.  Don't worry about locking the
         * global_rsv, it doesn't change except when the transaction commits.
         */
	if (sinfo->flags & BTRFS_BLOCK_GROUP_METADATA)
		num_allocated += calc_global_rsv_need_space(global_rsv);

	/*
         * in limited mode, we want to have some free space up to
         * about 1% of the FS size.
         */
	if (force == CHUNK_ALLOC_LIMITED) {
		thresh = btrfs_super_total_bytes(fs_info->super_copy);
		thresh = max_t(u64, SZ_64M, div_factor_fine(thresh, 1));

		if (num_bytes - num_allocated < thresh)
			return 1;
	}

	if (num_allocated + SZ_2M < div_factor(num_bytes, 8))
		return 0;
	return 1;
}

Contributors
Person Tokens Prop Commits CommitProp
chris mason chris mason 68 47.55% 3 27.27%
josef bacik josef bacik 47 32.87% 4 36.36%
zheng yan zheng yan 21 14.69% 1 9.09%
miao xie miao xie 3 2.10% 1 9.09%
byongho lee byongho lee 2 1.40% 1 9.09%
jeff mahoney jeff mahoney 2 1.40% 1 9.09%
Total 143 100.00% 11 100.00%



static u64 get_profile_num_devs(struct btrfs_fs_info *fs_info, u64 type)
{
	u64 num_dev;

	if (type & (BTRFS_BLOCK_GROUP_RAID10 |
		    BTRFS_BLOCK_GROUP_RAID0 |
		    BTRFS_BLOCK_GROUP_RAID5 |
		    BTRFS_BLOCK_GROUP_RAID6))
		num_dev = fs_info->fs_devices->rw_devices;
	else if (type & BTRFS_BLOCK_GROUP_RAID1)
		num_dev = 2;
	else
		num_dev = 1;	/* DUP or single */

	return num_dev;
}

Contributors
Person Tokens Prop Commits CommitProp
liu bo liu bo 49 83.05% 1 25.00%
david woodhouse david woodhouse 7 11.86% 1 25.00%
jeff mahoney jeff mahoney 2 3.39% 1 25.00%
filipe david borba manana filipe david borba manana 1 1.69% 1 25.00%
Total 59 100.00% 4 100.00%

/*
 * If @is_allocation is true, reserve space in the system space info necessary
 * for allocating a chunk, otherwise if it's false, reserve space necessary for
 * removing a chunk.
 */


void check_system_chunk(struct btrfs_trans_handle *trans,
			struct btrfs_fs_info *fs_info, u64 type)
{
	struct btrfs_space_info *info;
	u64 left;
	u64 thresh;
	int ret = 0;
	u64 num_devs;

	/*
         * Needed because we can end up allocating a system chunk and for an
         * atomic and race free space reservation in the chunk block reserve.
         */
	ASSERT(mutex_is_locked(&fs_info->chunk_mutex));

	info = __find_space_info(fs_info, BTRFS_BLOCK_GROUP_SYSTEM);
	spin_lock(&info->lock);
	left = info->total_bytes - info->bytes_used - info->bytes_pinned -
		info->bytes_reserved - info->bytes_readonly -
		info->bytes_may_use;
	spin_unlock(&info->lock);

	num_devs = get_profile_num_devs(fs_info, type);

	/* num_devs device items to update and 1 chunk item to add or remove */
	thresh = btrfs_calc_trunc_metadata_size(fs_info, num_devs) +
		btrfs_calc_trans_metadata_size(fs_info, 1);

	if (left < thresh && btrfs_test_opt(fs_info, ENOSPC_DEBUG)) {
		btrfs_info(fs_info, "left=%llu, need=%llu, flags=%llu",
			   left, thresh, type);
		dump_space_info(fs_info, info, 0, 0);
	}

	if (left < thresh) {
		u64 flags;

		flags = btrfs_get_alloc_profile(fs_info->chunk_root, 0);
		/*
                 * Ignore failure to create system chunk. We might end up not
                 * needing it, as we might not need to COW all nodes/leafs from
                 * the paths we visit in the chunk tree (they were already COWed
                 * or created in the current transaction for example).
                 */
		ret = btrfs_alloc_chunk(trans, fs_info, flags);
	}

	if (!ret) {
		ret = btrfs_block_rsv_add(fs_info->chunk_root,
					  &fs_info->chunk_block_rsv,
					  thresh, BTRFS_RESERVE_NO_FLUSH);
		if (!ret)
			trans->chunk_bytes_reserved += thresh;
	}
}

Contributors
Person Tokens Prop Commits CommitProp
liu bo liu bo 142 60.43% 1 11.11%
filipe david borba manana filipe david borba manana 80 34.04% 3 33.33%
jeff mahoney jeff mahoney 9 3.83% 4 44.44%
simon kirby simon kirby 4 1.70% 1 11.11%
Total 235 100.00% 9 100.00%

/*
 * If force is CHUNK_ALLOC_FORCE:
 *    - return 1 if it successfully allocates a chunk,
 *    - return errors including -ENOSPC otherwise.
 * If force is NOT CHUNK_ALLOC_FORCE:
 *    - return 0 if it doesn't need to allocate a new chunk,
 *    - return 1 if it successfully allocates a chunk,
 *    - return errors including -ENOSPC otherwise.
 */


static int do_chunk_alloc(struct btrfs_trans_handle *trans,
			  struct btrfs_fs_info *fs_info, u64 flags, int force)
{
	struct btrfs_space_info *space_info;
	int wait_for_alloc = 0;
	int ret = 0;

	/* Don't re-enter if we're already allocating a chunk */
	if (trans->allocating_chunk)
		return -ENOSPC;

	space_info = __find_space_info(fs_info, flags);
	if (!space_info) {
		ret = update_space_info(fs_info, flags, 0, 0, 0, &space_info);
		BUG_ON(ret); /* -ENOMEM */
	}
	BUG_ON(!space_info); /* Logic error */

again:
	spin_lock(&space_info->lock);
	if (force < space_info->force_alloc)
		force = space_info->force_alloc;
	if (space_info->full) {
		if (should_alloc_chunk(fs_info, space_info, force))
			ret = -ENOSPC;
		else
			ret = 0;
		spin_unlock(&space_info->lock);
		return ret;
	}

	if (!should_alloc_chunk(fs_info, space_info, force)) {
		spin_unlock(&space_info->lock);
		return 0;
	} else if (space_info->chunk_alloc) {
		wait_for_alloc = 1;
	} else {
		space_info->chunk_alloc = 1;
	}

	spin_unlock(&space_info->lock);

	mutex_lock(&fs_info->chunk_mutex);

	/*
         * The chunk_mutex is held throughout the entirety of a chunk
         * allocation, so once we've acquired the chunk_mutex we know that the
         * other guy is done and we need to recheck and see if we should
         * allocate.
         */
	if (wait_for_alloc) {
		mutex_unlock(&fs_info->chunk_mutex);
		wait_for_alloc = 0;
		goto again;
	}

	trans->allocating_chunk = true;

	/*
         * If we have mixed data/metadata chunks we want to make sure we keep
         * allocating mixed chunks instead of individual chunks.
         */
	if (btrfs_mixed_space_info(space_info))
		flags |= (BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA);

	/*
         * if we're doing a data chunk, go ahead and make sure that
         * we keep a reasonable number of metadata chunks allocated in the
         * FS as well.
         */
	if (flags & BTRFS_BLOCK_GROUP_DATA && fs_info->metadata_ratio) {
		fs_info->data_chunk_allocations++;
		if (!(fs_info->data_chunk_allocations %
		      fs_info->metadata_ratio))
			force_metadata_allocation(fs_info);
	}

	/*
         * Check if we have enough space in SYSTEM chunk because we may need
         * to update devices.
         */
	check_system_chunk(trans, fs_info, flags);

	ret = btrfs_alloc_chunk(trans, fs_info, flags);
	trans->allocating_chunk = false;

	spin_lock(&space_info->lock);
	if (ret < 0 && ret != -ENOSPC)
		goto out;
	if (ret)
		space_info->full = 1;
	else
		ret = 1;

	space_info->force_alloc = CHUNK_ALLOC_NO_FORCE;
out:
	space_info->chunk_alloc = 0;
	spin_unlock(&space_info->lock);
	mutex_unlock(&fs_info->chunk_mutex);
	/*
         * When we allocate a new chunk we reserve space in the chunk block
         * reserve to make sure we can COW nodes/leafs in the chunk tree or
         * add new nodes/leafs to it if we end up needing to do it when
         * inserting the chunk item and updating device items as part of the
         * second phase of chunk allocation, performed by
         * btrfs_finish_chunk_alloc(). So make sure we don't accumulate a
         * large number of new block groups to create in our transaction
         * handle's new_bgs list to avoid exhausting the chunk block reserve
         * in extreme cases - like having a single transaction create many new
         * block groups when starting to write out the free space caches of all
         * the block groups that were made dirty during the lifetime of the
         * transaction.
         */
	if (trans->can_flush_pending_bgs &&
	    trans->chunk_bytes_reserved >= (u64)SZ_2M) {
		btrfs_create_pending_block_groups(trans, fs_info);
		btrfs_trans_release_chunk_metadata(trans);
	}
	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
josef bacik josef bacik 178 41.49% 7 26.92%
zheng yan zheng yan 141 32.87% 4 15.38%
filipe david borba manana filipe david borba manana 48 11.19% 3 11.54%
chris mason chris mason 16 3.73% 5 19.23%
mark fasheh mark fasheh 14 3.26% 1 3.85%
alexandre oliva alexandre oliva 10 2.33% 1 3.85%
jeff mahoney jeff mahoney 9 2.10% 2 7.69%
liu bo liu bo 9 2.10% 1 3.85%
byongho lee byongho lee 2 0.47% 1 3.85%
miao xie miao xie 2 0.47% 1 3.85%
Total 429 100.00% 26 100.00%



static int can_overcommit(struct btrfs_root *root,
			  struct btrfs_space_info *space_info, u64 bytes,
			  enum btrfs_reserve_flush_enum flush)
{
	struct btrfs_fs_info *fs_info = root->fs_info;
	struct btrfs_block_rsv *global_rsv = &fs_info->global_block_rsv;
	u64 profile;
	u64 space_size;
	u64 avail;
	u64 used;

	/* Don't overcommit when in mixed mode. */
	if (space_info->flags & BTRFS_BLOCK_GROUP_DATA)
		return 0;

	profile = btrfs_get_alloc_profile(root, 0);
	used = space_info->bytes_used + space_info->bytes_reserved +
		space_info->bytes_pinned + space_info->bytes_readonly;

	/*
         * We only want to allow over committing if we have lots of actual space
         * free, but if we don't have enough space to handle the global reserve
         * space then we could end up having a real enospc problem when trying
         * to allocate a chunk or some other such important allocation.
         */
	spin_lock(&global_rsv->lock);
	space_size = calc_global_rsv_need_space(global_rsv);
	spin_unlock(&global_rsv->lock);
	if (used + space_size >= space_info->total_bytes)
		return 0;

	used += space_info->bytes_may_use;

	spin_lock(&fs_info->free_chunk_lock);
	avail = fs_info->free_chunk_space;
	spin_unlock(&fs_info->free_chunk_lock);

	/*
         * If we have dup, raid1 or raid10 then only half of the free
         * space is actually useable.  For raid56, the space info used
         * doesn't include the parity drive, so we don't have to
         * change the math
         */
	if (profile & (BTRFS_BLOCK_GROUP_DUP |
		       BTRFS_BLOCK_GROUP_RAID1 |
		       BTRFS_BLOCK_GROUP_RAID10))
		avail >>= 1;

	/*
         * If we aren't flushing all things, let us overcommit up to
         * 1/2th of the space. If we can flush, don't let us overcommit
         * too much, let it overcommit up to 1/8 of the space.
         */
	if (flush == BTRFS_RESERVE_FLUSH_ALL)
		avail >>= 3;
	else
		avail >>= 1;

	if (used + bytes < space_info->total_bytes + avail)
		return 1;
	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
josef bacik josef bacik 182 87.08% 4 44.44%
jeff mahoney jeff mahoney 14 6.70% 1 11.11%
miao xie miao xie 12 5.74% 3 33.33%
david woodhouse david woodhouse 1 0.48% 1 11.11%
Total 209 100.00% 9 100.00%



static void btrfs_writeback_inodes_sb_nr(struct btrfs_fs_info *fs_info,
					 unsigned long nr_pages, int nr_items)
{
	struct super_block *sb = fs_info->sb;

	if (down_read_trylock(&sb->s_umount)) {
		writeback_inodes_sb_nr(sb, nr_pages, WB_REASON_FS_FREE_SPACE);
		up_read(&sb->s_umount);
	} else {
		/*
                 * We needn't worry the filesystem going from r/w to r/o though
                 * we don't acquire ->s_umount mutex, because the filesystem
                 * should guarantee the delalloc inodes list be empty after
                 * the filesystem is readonly(all dirty pages are written to
                 * the disk).
                 */
		btrfs_start_delalloc_roots(fs_info, 0, nr_items);
		if (!current->journal_info)
			btrfs_wait_ordered_roots(fs_info, nr_items, 0, (u64)-1);
	}
}

Contributors
Person Tokens Prop Commits CommitProp
miao xie miao xie 46 50.55% 6 50.00%
josef bacik josef bacik 29 31.87% 2 16.67%
filipe david borba manana filipe david borba manana 8 8.79% 1 8.33%
jeff mahoney jeff mahoney 7 7.69% 2 16.67%
eric sandeen eric sandeen 1 1.10% 1 8.33%
Total 91 100.00% 12 100.00%



static inline int calc_reclaim_items_nr(struct btrfs_fs_info *fs_info,
					u64 to_reclaim)
{
	u64 bytes;
	int nr;

	bytes = btrfs_calc_trans_metadata_size(fs_info, 1);
	nr = (int)div64_u64(to_reclaim, bytes);
	if (!nr)
		nr = 1;
	return nr;
}

Contributors
Person Tokens Prop Commits CommitProp
miao xie miao xie 51 94.44% 1 33.33%
jeff mahoney jeff mahoney 3 5.56% 2 66.67%
Total 54 100.00% 3 100.00%


#define EXTENT_SIZE_PER_ITEM	SZ_256K

/*
 * shrink metadata reservation for delalloc
 */


static void shrink_delalloc(struct btrfs_root *root, u64 to_reclaim, u64 orig,
			    bool wait_ordered)
{
	struct btrfs_fs_info *fs_info = root->fs_info;
	struct btrfs_block_rsv *block_rsv;
	struct btrfs_space_info *space_info;
	struct btrfs_trans_handle *trans;
	u64 delalloc_bytes;
	u64 max_reclaim;
	long time_left;
	unsigned long nr_pages;
	int loops;
	int items;
	enum btrfs_reserve_flush_enum flush;

	/* Calc the number of the pages we need flush for space reservation */
	items = calc_reclaim_items_nr(fs_info, to_reclaim);
	to_reclaim = (u64)items * EXTENT_SIZE_PER_ITEM;

	trans = (struct btrfs_trans_handle *)current->journal_info;
	block_rsv = &fs_info->delalloc_block_rsv;
	space_info = block_rsv->space_info;

	delalloc_bytes = percpu_counter_sum_positive(
						&fs_info->delalloc_bytes);
	if (delalloc_bytes == 0) {
		if (trans)
			return;
		if (wait_ordered)
			btrfs_wait_ordered_roots(fs_info, items, 0, (u64)-1);
		return;
	}

	loops = 0;
	while (delalloc_bytes && loops < 3) {
		max_reclaim = min(delalloc_bytes, to_reclaim);
		nr_pages = max_reclaim >> PAGE_SHIFT;
		btrfs_writeback_inodes_sb_nr(fs_info, nr_pages, items);
		/*
                 * We need to wait for the async pages to actually start before
                 * we do anything.
                 */
		max_reclaim = atomic_read(&fs_info->async_delalloc_pages);
		if (!max_reclaim)
			goto skip_async;

		if (max_reclaim <= nr_pages)
			max_reclaim = 0;
		else
			max_reclaim -= nr_pages;

		wait_event(fs_info->async_submit_wait,
			   atomic_read(&fs_info->async_delalloc_pages) <=
			   (int)max_reclaim);
skip_async:
		if (!trans)
			flush = BTRFS_RESERVE_FLUSH_ALL;
		else
			flush = BTRFS_RESERVE_NO_FLUSH;
		spin_lock(&space_info->lock);
		if (can_overcommit(root, space_info, orig, flush)) {
			spin_unlock(&space_info->lock);
			break;
		}
		if (list_empty(&space_info->tickets) &&
		    list_empty(&space_info->priority_tickets)) {
			spin_unlock(&space_info->lock);
			break;
		}
		spin_unlock(&space_info->lock);

		loops++;
		if (wait_ordered && !trans) {
			btrfs_wait_ordered_roots(fs_info, items, 0, (u64)-1);
		} else {
			time_left = schedule_timeout_killable(1);
			if (time_left)
				break;
		}
		delalloc_bytes = percpu_counter_sum_positive(
						&fs_info->delalloc_bytes);
	}
}

Contributors
Person Tokens Prop Commits CommitProp
josef bacik josef bacik 216 56.54% 11 35.48%
miao xie miao xie 104 27.23% 10 32.26%
zheng yan zheng yan 19 4.97% 2 6.45%
filipe david borba manana filipe david borba manana 16 4.19% 1 3.23%
chris mason chris mason 12 3.14% 3 9.68%
jeff mahoney jeff mahoney 11 2.88% 2 6.45%
adam borowski adam borowski 3 0.79% 1 3.23%
kirill a. shutemov kirill a. shutemov 1 0.26% 1 3.23%
Total 382 100.00% 31 100.00%

/**
 * maybe_commit_transaction - possibly commit the transaction if its ok to
 * @root - the root we're allocating for
 * @bytes - the number of bytes we want to reserve
 * @force - force the commit
 *
 * This will check to make sure that committing the transaction will actually
 * get us somewhere and then commit the transaction if it does.  Otherwise it
 * will return -ENOSPC.
 */


static int may_commit_transaction(struct btrfs_root *root,
				  struct btrfs_space_info *space_info,
				  u64 bytes, int force)
{
	struct btrfs_fs_info *fs_info = root->fs_info;
	struct btrfs_block_rsv *delayed_rsv = &fs_info->delayed_block_rsv;
	struct btrfs_trans_handle *trans;

	trans = (struct btrfs_trans_handle *)current->journal_info;
	if (trans)
		return -EAGAIN;

	if (force)
		goto commit;

	/* See if there is enough pinned space to make this reservation */
	if (percpu_counter_compare(&space_info->total_bytes_pinned,
				   bytes) >= 0)
		goto commit;

	/*
         * See if there is some space in the delayed insertion reservation for
         * this reservation.
         */
	if (space_info != delayed_rsv->space_info)
		return -ENOSPC;

	spin_lock(&delayed_rsv->lock);
	if (percpu_counter_compare(&space_info->total_bytes_pinned,
				   bytes - delayed_rsv->size) >= 0) {
		spin_unlock(&delayed_rsv->lock);
		return -ENOSPC;
	}
	spin_unlock(&delayed_rsv->lock);

commit:
	trans = btrfs_join_transaction(root);
	if (IS_ERR(trans))
		return -ENOSPC;

	return btrfs_commit_transaction(trans);
}

Contributors
Person Tokens Prop Commits CommitProp
josef bacik josef bacik 165 93.22% 4 57.14%
jeff mahoney jeff mahoney 9 5.08% 1 14.29%
liu bo liu bo 2 1.13% 1 14.29%
zheng yan zheng yan 1 0.56% 1 14.29%
Total 177 100.00% 7 100.00%


struct reserve_ticket {
	
u64 bytes;
	
int error;
	
struct list_head list;
	
wait_queue_head_t wait;
};



static int flush_space(struct btrfs_root *root,
		       struct btrfs_space_info *space_info, u64 num_bytes,
		       u64 orig_bytes, int state)
{
	struct btrfs_fs_info *fs_info = root->fs_info;
	struct btrfs_trans_handle *trans;
	int nr;
	int ret = 0;

	switch (state) {
	case FLUSH_DELAYED_ITEMS_NR:
	case FLUSH_DELAYED_ITEMS:
		if (state == FLUSH_DELAYED_ITEMS_NR)
			nr = calc_reclaim_items_nr(fs_info, num_bytes) * 2;
		else
			nr = -1;

		trans = btrfs_join_transaction(root);
		if (IS_ERR(trans)) {
			ret = PTR_ERR(trans);
			break;
		}
		ret = btrfs_run_delayed_items_nr(trans, fs_info, nr);
		btrfs_end_transaction(trans);
		break;
	case FLUSH_DELALLOC:
	case FLUSH_DELALLOC_WAIT:
		shrink_delalloc(root, num_bytes * 2, orig_bytes,
				state == FLUSH_DELALLOC_WAIT);
		break;
	case ALLOC_CHUNK:
		trans = btrfs_join_transaction(root);
		if (IS_ERR(trans)) {
			ret = PTR_ERR(trans);
			break;
		}
		ret = do_chunk_alloc(trans, fs_info,
				     btrfs_get_alloc_profile(root, 0),
				     CHUNK_ALLOC_NO_FORCE);
		btrfs_end_transaction(trans);
		if (ret > 0 || ret == -ENOSPC)
			ret = 0;
		break;
	case COMMIT_TRANS:
		ret = may_commit_transaction(root, space_info, orig_bytes, 0);
		break;
	default:
		ret = -ENOSPC;
		break;
	}

	trace_btrfs_flush_space(fs_info, space_info->flags, num_bytes,
				orig_bytes, state, ret);
	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
josef bacik josef bacik 235 92.16% 5 50.00%
jeff mahoney jeff mahoney 11 4.31% 2 20.00%
miao xie miao xie 5 1.96% 2 20.00%
alex lyakas alex lyakas 4 1.57% 1 10.00%
Total 255 100.00% 10 100.00%


static inline u64

btrfs_calc_reclaim_metadata_size(struct btrfs_root *root,
				 struct btrfs_space_info *space_info)
{
	struct reserve_ticket *ticket;
	u64 used;
	u64 expected;
	u64 to_reclaim = 0;

	list_for_each_entry(ticket, &space_info->tickets, list)
		to_reclaim += ticket->bytes;
	list_for_each_entry(ticket, &space_info->priority_tickets, list)
		to_reclaim += ticket->bytes;
	if (to_reclaim)
		return to_reclaim;

	to_reclaim = min_t(u64, num_online_cpus() * SZ_1M, SZ_16M);
	if (can_overcommit(root, space_info, to_reclaim,
			   BTRFS_RESERVE_FLUSH_ALL))
		return 0;

	used = space_info->bytes_used + space_info->bytes_reserved +
	       space_info->bytes_pinned + space_info->bytes_readonly +
	       space_info->bytes_may_use;
	if (can_overcommit(root, space_info, SZ_1M, BTRFS_RESERVE_FLUSH_ALL))
		expected = div_factor_fine(space_info->total_bytes, 95);
	else
		expected = div_factor_fine(space_info->total_bytes, 90);

	if (used > expected)
		to_reclaim = used - expected;
	else
		to_reclaim = 0;
	to_reclaim = min(to_reclaim, space_info->bytes_may_use +
				     space_info->bytes_reserved);
	return to_reclaim;
}

Contributors
Person Tokens Prop Commits CommitProp
miao xie miao xie 119 62.30% 1 25.00%
josef bacik josef bacik 41 21.47% 1 25.00%
wang xiaoguang wang xiaoguang 30 15.71% 1 25.00%
byongho lee byongho lee 1 0.52% 1 25.00%
Total 191 100.00% 4 100.00%



static inline int need_do_async_reclaim(struct btrfs_space_info *space_info,
					struct btrfs_root *root, u64 used)
{
	struct btrfs_fs_info *fs_info = root->fs_info;
	u64 thresh = div_factor_fine(space_info->total_bytes, 98);

	/* If we're just plain full then async reclaim just slows us down. */
	if ((space_info->bytes_used + space_info->bytes_reserved) >= thresh)
		return 0;

	if (!btrfs_calc_reclaim_metadata_size(root, space_info))
		return 0;

	return (used >= thresh && !btrfs_fs_closing(fs_info) &&
		!test_bit(BTRFS_FS_STATE_REMOUNTING, &fs_info->fs_state));
}

Contributors
Person Tokens Prop Commits CommitProp
miao xie miao xie 45 46.88% 1 16.67%
josef bacik josef bacik 42 43.75% 4 66.67%
jeff mahoney jeff mahoney 9 9.38% 1 16.67%
Total 96 100.00% 6 100.00%



static void wake_all_tickets(struct list_head *head)
{
	struct reserve_ticket *ticket;

	while (!list_empty(head)) {
		ticket = list_first_entry(head, struct reserve_ticket, list);
		list_del_init(&ticket->list);
		ticket->error = -ENOSPC;
		wake_up(&ticket->wait);
	}
}

Contributors
Person Tokens Prop Commits CommitProp
josef bacik josef bacik 32 52.46% 1 33.33%
miao xie miao xie 27 44.26% 1 33.33%
liu bo liu bo 2 3.28% 1 33.33%
Total 61 100.00% 3 100.00%

/*
 * This is for normal flushers, we can wait all goddamned day if we want to.  We
 * will loop and continuously try to flush as long as we are making progress.
 * We count progress as clearing off tickets each time we have to loop.
 */


static void btrfs_async_reclaim_metadata_space(struct work_struct *work)
{
	struct btrfs_fs_info *fs_info;
	struct btrfs_space_info *space_info;
	u64 to_reclaim;
	int flush_state;
	int commit_cycles = 0;
	u64 last_tickets_id;

	fs_info = container_of(work, struct btrfs_fs_info, async_reclaim_work);
	space_info = __find_space_info(fs_info, BTRFS_BLOCK_GROUP_METADATA);

	spin_lock(&space_info->lock);
	to_reclaim = btrfs_calc_reclaim_metadata_size(fs_info->fs_root,
						      space_info);
	if (!to_reclaim) {
		space_info->flush = 0;
		spin_unlock(&space_info->lock);
		return;
	}
	last_tickets_id = space_info->tickets_id;
	spin_unlock(&space_info->lock);

	flush_state = FLUSH_DELAYED_ITEMS_NR;
	do {
		struct reserve_ticket *ticket;
		int ret;

		ret = flush_space(fs_info->fs_root, space_info, to_reclaim,
			    to_reclaim, flush_state);
		spin_lock(&space_info->lock);
		if (list_empty(&space_info->tickets)) {
			space_info->flush = 0;
			spin_unlock(&space_info->lock);
			return;
		}
		to_reclaim = btrfs_calc_reclaim_metadata_size(fs_info->fs_root,
							      space_info);
		ticket = list_first_entry(&space_info->tickets,
					  struct reserve_ticket, list);
		if (last_tickets_id == space_info->tickets_id) {
			flush_state++;
		} else {
			last_tickets_id = space_info->tickets_id;
			flush_state = FLUSH_DELAYED_ITEMS_NR;
			if (commit_cycles)
				commit_cycles--;
		}

		if (flush_state > COMMIT_TRANS) {
			commit_cycles++;
			if (commit_cycles > 2) {
				wake_all_tickets(&space_info->tickets);
				space_info->flush = 0;
			} else {
				flush_state = FLUSH_DELAYED_ITEMS_NR;
			}
		}
		spin_unlock(&space_info->lock);
	} while (flush_state <= COMMIT_TRANS);
}

Contributors
Person Tokens Prop Commits CommitProp
josef bacik josef bacik 168 57.53% 1 25.00%
miao xie miao xie 110 37.67% 1 25.00%
wang xiaoguang wang xiaoguang 13 4.45% 1 25.00%
liu bo liu bo 1 0.34% 1 25.00%
Total 292 100.00% 4 100.00%



void btrfs_init_async_reclaim_work(struct work_struct *work)
{
	INIT_WORK(work, btrfs_async_reclaim_metadata_space);
}

Contributors
Person Tokens Prop Commits CommitProp
miao xie miao xie 17 100.00% 1 100.00%
Total 17 100.00% 1 100.00%



static void priority_reclaim_metadata_space(struct btrfs_fs_info *fs_info,
					    struct btrfs_space_info *space_info,
					    struct reserve_ticket *ticket)
{
	u64 to_reclaim;
	int flush_state = FLUSH_DELAYED_ITEMS_NR;

	spin_lock(&space_info->lock);
	to_reclaim = btrfs_calc_reclaim_metadata_size(fs_info->fs_root,
						      space_info);
	if (!to_reclaim) {
		spin_unlock(&space_info->lock);
		return;
	}
	spin_unlock(&space_info->lock);

	do {
		flush_space(fs_info->fs_root, space_info, to_reclaim,
			    to_reclaim, flush_state);
		flush_state++;
		spin_lock(&space_info->lock);
		if (ticket->bytes == 0) {
			spin_unlock(&space_info->lock);
			return;
		}
		spin_unlock(&space_info->lock);

		/*
                 * Priority flushers can't wait on delalloc without
                 * deadlocking.
                 */
		if (flush_state == FLUSH_DELALLOC ||
		    flush_state == FLUSH_DELALLOC_WAIT)
			flush_state = ALLOC_CHUNK;
	} while (flush_state < COMMIT_TRANS);
}

Contributors
Person Tokens Prop Commits CommitProp
josef bacik josef bacik 144 96.00% 5 62.50%
zheng yan zheng yan 6 4.00% 3 37.50%
Total 150 100.00% 8 100.00%



static int wait_reserve_ticket(struct btrfs_fs_info *fs_info,
			       struct btrfs_space_info *space_info,
			       struct reserve_ticket *ticket, u64 orig_bytes)

{
	DEFINE_WAIT(wait);
	int ret = 0;

	spin_lock(&space_info->lock);
	while (ticket->bytes > 0 && ticket->error == 0) {
		ret = prepare_to_wait_event(&ticket->wait, &wait, TASK_KILLABLE);
		if (ret) {
			ret = -EINTR;
			break;
		}
		spin_unlock(&space_info->lock);

		schedule();

		finish_wait(&ticket->wait, &wait);
		spin_lock(&space_info->lock);
	}
	if (!ret)
		ret = ticket->error;
	if (!list_empty(&ticket->list))
		list_del_init(&ticket->list);
	if (ticket->bytes && ticket->bytes < orig_bytes) {
		u64 num_bytes = orig_bytes - ticket->bytes;
		space_info->bytes_may_use -= num_bytes;
		trace_btrfs_space_reservation(fs_info, "space_info",
					      space_info->flags, num_bytes, 0);
	}
	spin_unlock(&space_info->lock);

	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
josef bacik josef bacik 195 97.50% 4 66.67%
zheng yan zheng yan 5 2.50% 2 33.33%
Total 200 100.00% 6 100.00%

/**
 * reserve_metadata_bytes - try to reserve bytes from the block_rsv's space
 * @root - the root we're allocating for
 * @space_info - the space info we want to allocate from
 * @orig_bytes - the number of bytes we want
 * @flush - whether or not we can flush to make our reservation
 *
 * This will reserve orig_bytes number of bytes from the space info associated
 * with the block_rsv.  If there is not enough space it will make an attempt to
 * flush out space to make room.  It will do this by flushing delalloc if
 * possible or committing the transaction.  If flush is 0 then no attempts to
 * regain reservations will be made and this will fail if there is not enough
 * space already.
 */


static int __reserve_metadata_bytes(struct btrfs_root *root,
				    struct btrfs_space_info *space_info,
				    u64 orig_bytes,
				    enum btrfs_reserve_flush_enum flush)
{
	struct btrfs_fs_info *fs_info = root->fs_info;
	struct reserve_ticket ticket;
	u64 used;
	int ret = 0;

	ASSERT(orig_bytes);
	ASSERT(!current->journal_info || flush != BTRFS_RESERVE_FLUSH_ALL);

	spin_lock(&space_info->lock);
	ret = -ENOSPC;
	used = space_info->bytes_used + space_info->bytes_reserved +
		space_info->bytes_pinned + space_info->bytes_readonly +
		space_info->bytes_may_use;

	/*
         * If we have enough space then hooray, make our reservation and carry
         * on.  If not see if we can overcommit, and if we can, hooray carry on.
         * If not things get more complicated.
         */
	if (used + orig_bytes <= space_info->total_bytes) {
		space_info->bytes_may_use += orig_bytes;
		trace_btrfs_space_reservation(fs_info, "space_info",
					      space_info->flags, orig_bytes, 1);
		ret = 0;
	} else if (can_overcommit(root, space_info, orig_bytes, flush)) {
		space_info->bytes_may_use += orig_bytes;
		trace_btrfs_space_reservation(fs_info, "space_info",
					      space_info->flags, orig_bytes, 1);
		ret = 0;
	}

	/*
         * If we couldn't make a reservation then setup our reservation ticket
         * and kick the async worker if it's not already running.
         *
         * If we are a priority flusher then we just need to add our ticket to
         * the list and we will do our own flushing further down.
         */
	if (ret && flush != BTRFS_RESERVE_NO_FLUSH) {
		ticket.bytes = orig_bytes;
		ticket.error = 0;
		init_waitqueue_head(&ticket.wait);
		if (flush == BTRFS_RESERVE_FLUSH_ALL) {
			list_add_tail(&ticket.list, &space_info->tickets);
			if (!space_info->flush) {
				space_info->flush = 1;
				trace_btrfs_trigger_flush(fs_info,
							  space_info->flags,
							  orig_bytes, flush,
							  "enospc");
				queue_work(system_unbound_wq,
					   &root->fs_info->async_reclaim_work);
			}
		} else {
			list_add_tail(&ticket.list,
				      &space_info->priority_tickets);
		}
	} else if (!ret && space_info->flags & BTRFS_BLOCK_GROUP_METADATA) {
		used += orig_bytes;
		/*
                 * We will do the space reservation dance during log replay,
                 * which means we won't have fs_info->fs_root set, so don't do
                 * the async reclaim as we will panic.
                 */
		if (!test_bit(BTRFS_FS_LOG_RECOVERING, &fs_info->flags) &&
		    need_do_async_reclaim(space_info, root, used) &&
		    !work_busy(&fs_info->async_reclaim_work)) {
			trace_btrfs_trigger_flush(fs_info, space_info->flags,
						  orig_bytes, flush, "preempt");
			queue_work(system_unbound_wq,
				   &fs_info->async_reclaim_work);
		}
	}
	spin_unlock(&space_info->lock);
	if (!ret || flush == BTRFS_RESERVE_NO_FLUSH)
		return ret;

	if (flush == BTRFS_RESERVE_FLUSH_ALL)
		return wait_reserve_ticket(fs_info, space_info, &ticket,
					   orig_bytes);

	ret = 0;
	priority_reclaim_metadata_space(fs_info, space_info, &ticket);
	spin_lock(&space_info->lock);
	if (ticket.bytes) {
		if (ticket.bytes < orig_bytes) {
			u64 num_bytes = orig_bytes - ticket.bytes;
			space_info->bytes_may_use -= num_bytes;
			trace_btrfs_space_reservation(fs_info, "space_info",
						      space_info->flags,
						      num_bytes, 0);

		}
		list_del_init(&ticket.list);
		ret = -ENOSPC;
	}
	spin_unlock(&space_info->lock);
	ASSERT(list_empty(&ticket.list));
	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
josef bacik josef bacik 425 83.99% 16 72.73%
miao xie miao xie 53 10.47% 2 9.09%
zheng yan zheng yan 15 2.96% 2 9.09%
jeff mahoney jeff mahoney 9 1.78% 1 4.55%
liu bo liu bo 4 0.79% 1 4.55%
Total 506 100.00% 22 100.00%

/**
 * reserve_metadata_bytes - try to reserve bytes from the block_rsv's space
 * @root - the root we're allocating for
 * @block_rsv - the block_rsv we're allocating for
 * @orig_bytes - the number of bytes we want
 * @flush - whether or not we can flush to make our reservation
 *
 * This will reserve orgi_bytes number of bytes from the space info associated
 * with the block_rsv.  If there is not enough space it will make an attempt to
 * flush out space to make room.  It will do this by flushing delalloc if
 * possible or committing the transaction.  If flush is 0 then no attempts to
 * regain reservations will be made and this will fail if there is not enough
 * space already.
 */


static int reserve_metadata_bytes(struct btrfs_root *root,
				  struct btrfs_block_rsv *block_rsv,
				  u64 orig_bytes,
				  enum btrfs_reserve_flush_enum flush)
{
	struct btrfs_fs_info *fs_info = root->fs_info;
	struct btrfs_block_rsv *global_rsv = &fs_info->global_block_rsv;
	int ret;

	ret = __reserve_metadata_bytes(root, block_rsv->space_info, orig_bytes,
				       flush);
	if (ret == -ENOSPC &&
	    unlikely(root->orphan_cleanup_state == ORPHAN_CLEANUP_STARTED)) {
		if (block_rsv != global_rsv &&
		    !block_rsv_use_bytes(global_rsv, orig_bytes))
			ret = 0;
	}
	if (ret == -ENOSPC)
		trace_btrfs_space_reservation(fs_info, "space_info:enospc",
					      block_rsv->space_info->flags,
					      orig_bytes, 1);
	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
josef bacik josef bacik 80 65.04% 3 37.50%
jeff mahoney jeff mahoney 39 31.71% 2 25.00%
zheng yan zheng yan 3 2.44% 2 25.00%
miao xie miao xie 1 0.81% 1 12.50%
Total 123 100.00% 8 100.00%



static struct btrfs_block_rsv *get_block_rsv(
					const struct btrfs_trans_handle *trans,
					const struct btrfs_root *root)
{
	struct btrfs_fs_info *fs_info = root->fs_info;
	struct btrfs_block_rsv *block_rsv = NULL;

	if (test_bit(BTRFS_ROOT_REF_COWS, &root->state) ||
	    (root == fs_info->csum_root && trans->adding_csums) ||
	    (root == fs_info->uuid_root))
		block_rsv = trans->block_rsv;

	if (!block_rsv)
		block_rsv = root->block_rsv;

	if (!block_rsv)
		block_rsv = &fs_info->empty_block_rsv;

	return block_rsv;
}

Contributors
Person Tokens Prop Commits CommitProp
zheng yan zheng yan 41 41.00% 3 23.08%
josef bacik josef bacik 16 16.00% 3 23.08%
stefan behrens stefan behrens 14 14.00% 1 7.69%
jeff mahoney jeff mahoney 11 11.00% 2 15.38%
miao xie miao xie 7 7.00% 1 7.69%
alexandru moise alexandru moise 6 6.00% 1 7.69%
chris mason chris mason 5 5.00% 2 15.38%
Total 100 100.00% 13 100.00%



static int block_rsv_use_bytes(struct btrfs_block_rsv *block_rsv,
			       u64 num_bytes)
{
	int ret = -ENOSPC;
	spin_lock(&block_rsv->lock);
	if (block_rsv->reserved >= num_bytes) {
		block_rsv->reserved -= num_bytes;
		if (block_rsv->reserved < block_rsv->size)
			block_rsv->full = 0;
		ret = 0;
	}
	spin_unlock(&block_rsv->lock);
	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
zheng yan zheng yan 53 70.67% 3 60.00%
josef bacik josef bacik 20 26.67% 1 20.00%
chris mason chris mason 2 2.67% 1 20.00%
Total 75 100.00% 5 100.00%



static void block_rsv_add_bytes(struct btrfs_block_rsv *block_rsv,
				u64 num_bytes, int update_size)
{
	spin_lock(&block_rsv->lock);
	block_rsv->reserved += num_bytes;
	if (update_size)
		block_rsv->size += num_bytes;
	else if (block_rsv->reserved >= block_rsv->size)
		block_rsv->full = 1;
	spin_unlock(&block_rsv->lock);
}

Contributors
Person Tokens Prop Commits CommitProp
zheng yan zheng yan 55 83.33% 3 60.00%
chris mason chris mason 8 12.12% 1 20.00%
josef bacik josef bacik 3 4.55% 1 20.00%
Total 66 100.00% 5 100.00%



int btrfs_cond_migrate_bytes(struct btrfs_fs_info *fs_info,
			     struct btrfs_block_rsv *dest, u64 num_bytes,
			     int min_factor)
{
	struct btrfs_block_rsv *global_rsv = &fs_info->global_block_rsv;
	u64 min_bytes;

	if (global_rsv->space_info != dest->space_info)
		return -ENOSPC;

	spin_lock(&global_rsv->lock);
	min_bytes = div_factor(global_rsv->size, min_factor);
	if (global_rsv->reserved < min_bytes + num_bytes) {
		spin_unlock(&global_rsv->lock);
		return -ENOSPC;
	}
	global_rsv->reserved -= num_bytes;
	if (global_rsv->reserved < global_rsv->size)
		global_rsv->full = 0;
	spin_unlock(&global_rsv->lock);

	block_rsv_add_bytes(dest, num_bytes, 1);
	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
josef bacik josef bacik 133 100.00% 1 100.00%
Total 133 100.00% 1 100.00%

/*
 * This is for space we already have accounted in space_info->bytes_may_use, so
 * basically when we're returning space from block_rsv's.
 */


static void space_info_add_old_bytes(struct btrfs_fs_info *fs_info,
				     struct btrfs_space_info *space_info,
				     u64 num_bytes)
{
	struct reserve_ticket *ticket;
	struct list_head *head;
	u64 used;
	enum btrfs_reserve_flush_enum flush = BTRFS_RESERVE_NO_FLUSH;
	bool check_overcommit = false;

	spin_lock(&space_info->lock);
	head = &space_info->priority_tickets;

	/*
         * If we are over our limit then we need to check and see if we can
         * overcommit, and if we can't then we just need to free up our space
         * and not satisfy any requests.
         */
	used = space_info->bytes_used + space_info->bytes_reserved +
		space_info->bytes_pinned + space_info->bytes_readonly +
		space_info->bytes_may_use;
	if (used - num_bytes >= space_info->total_bytes)
		check_overcommit = true;
again:
	while (!list_empty(head) && num_bytes) {
		ticket = list_first_entry(head, struct reserve_ticket,
					  list);
		/*
                 * We use 0 bytes because this space is already reserved, so
                 * adding the ticket space would be a double count.
                 */
		if (check_overcommit &&
		    !can_overcommit(fs_info->extent_root, space_info, 0,
				    flush))
			break;
		if (num_bytes >= ticket->bytes) {
			list_del_init(&ticket->list);
			num_bytes -= ticket->bytes;
			ticket->bytes = 0;
			space_info->tickets_id++;
			wake_up(&ticket->wait);
		} else {
			ticket->bytes -= num_bytes;
			num_bytes = 0;
		}
	}

	if (num_bytes && head == &space_info->priority_tickets) {
		head = &space_info->tickets;
		flush = BTRFS_RESERVE_FLUSH_ALL;
		goto again;
	}
	space_info->bytes_may_use -= num_bytes;
	trace_btrfs_space_reservation(fs_info, "space_info",
				      space_info->flags, num_bytes, 0);
	spin_unlock(&space_info->lock);
}

Contributors
Person Tokens Prop Commits CommitProp
josef bacik josef bacik 210 83.00% 2 28.57%
zheng yan zheng yan 30 11.86% 3 42.86%
chris mason chris mason 8 3.16% 1 14.29%
wang xiaoguang wang xiaoguang 5 1.98% 1 14.29%
Total 253 100.00% 7 100.00%

/*
 * This is for newly allocated space that isn't accounted in
 * space_info->bytes_may_use yet.  So if we allocate a chunk or unpin an extent
 * we use this helper.
 */


static void space_info_add_new_bytes(struct btrfs_fs_info *fs_info,
				     struct btrfs_space_info *space_info,
				     u64 num_bytes)
{
	struct reserve_ticket *ticket;
	struct list_head *head = &space_info->priority_tickets;

again:
	while (!list_empty(head) && num_bytes) {
		ticket = list_first_entry(head, struct reserve_ticket,
					  list);
		if (num_bytes >= ticket->bytes) {
			trace_btrfs_space_reservation(fs_info, "space_info",
						      space_info->flags,
						      ticket->bytes, 1);
			list_del_init(&ticket->list);
			num_bytes -= ticket->bytes;
			space_info->bytes_may_use += ticket->bytes;
			ticket->bytes = 0;
			space_info->tickets_id++;
			wake_up(&ticket->wait);
		} else {
			trace_btrfs_space_reservation(fs_info, "space_info",
						      space_info->flags,
						      num_bytes, 1);
			space_info->bytes_may_use += num_bytes;
			ticket->bytes -= num_bytes;
			num_bytes = 0;
		}
	}

	if (num_bytes && head == &space_info->priority_tickets) {
		head = &space_info->tickets;
		goto again;
	}
}

Contributors
Person Tokens Prop Commits CommitProp
josef bacik josef bacik 180 97.30% 2 66.67%
wang xiaoguang wang xiaoguang 5 2.70% 1 33.33%
Total 185 100.00% 3 100.00%



static void block_rsv_release_bytes(struct btrfs_fs_info *fs_info,
				    struct btrfs_block_rsv *block_rsv,
				    struct btrfs_block_rsv *dest, u64 num_bytes)
{
	struct btrfs_space_info *space_info = block_rsv->space_info;

	spin_lock(&block_rsv->lock);
	if (num_bytes == (u64)-1)
		num_bytes = block_rsv->size;
	block_rsv->size -= num_bytes;
	if (block_rsv->reserved >= block_rsv->size) {
		num_bytes = block_rsv->reserved - block_rsv->size;
		block_rsv->reserved = block_rsv->size;
		block_rsv->full = 1;
	} else {
		num_bytes = 0;
	}
	spin_unlock(&block_rsv->lock);

	if (num_bytes > 0) {
		if (dest) {
			spin_lock(&dest->lock);
			if (!dest->full) {
				u64 bytes_to_add;

				bytes_to_add = dest->size - dest->reserved;
				bytes_to_add = min(num_bytes, bytes_to_add);
				dest->reserved += bytes_to_add;
				if (dest->reserved >= dest->size)
					dest->full = 1;
				num_bytes -= bytes_to_add;
			}
			spin_unlock(&dest->lock);
		}
		if (num_bytes)
			space_info_add_old_bytes(fs_info, space_info,
						 num_bytes);
	}
}

Contributors
Person Tokens Prop Commits CommitProp
zheng yan zheng yan 102 47.66% 4 30.77%
josef bacik josef bacik 97 45.33% 5 38.46%
chris mason chris mason 14 6.54% 3 23.08%
david sterba david sterba 1 0.47% 1 7.69%
Total 214 100.00% 13 100.00%



int btrfs_block_rsv_migrate(struct btrfs_block_rsv *src,
			    struct btrfs_block_rsv *dst, u64 num_bytes,
			    int update_size)
{
	int ret;

	ret = block_rsv_use_bytes(src, num_bytes);
	if (ret)
		return ret;

	block_rsv_add_bytes(dst, num_bytes, update_size);
	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
zheng yan zheng yan 39 75.00% 4 57.14%
chris mason chris mason 8 15.38% 2 28.57%
josef bacik josef bacik 5 9.62% 1 14.29%
Total 52 100.00% 7 100.00%



void btrfs_init_block_rsv(struct btrfs_block_rsv *rsv, unsigned short type)
{
	memset(rsv, 0, sizeof(*rsv));
	spin_lock_init(&rsv->lock);
	rsv->type = type;
}

Contributors
Person Tokens Prop Commits CommitProp
zheng yan zheng yan 25 60.98% 4 57.14%
miao xie miao xie 10 24.39% 1 14.29%
chris mason chris mason 6 14.63% 2 28.57%
Total 41 100.00% 7 100.00%



struct btrfs_block_rsv *btrfs_alloc_block_rsv(struct btrfs_fs_info *fs_info,
					      unsigned short type)
{
	struct btrfs_block_rsv *block_rsv;

	block_rsv = kmalloc(sizeof(*block_rsv), GFP_NOFS);
	if (!block_rsv)
		return NULL;

	btrfs_init_block_rsv(block_rsv, type);
	block_rsv->space_info = __find_space_info(fs_info,
						  BTRFS_BLOCK_GROUP_METADATA);
	return block_rsv;
}

Contributors
Person Tokens Prop Commits CommitProp
zheng yan zheng yan 47 74.60% 4 50.00%
chris mason chris mason 8 12.70% 2 25.00%
miao xie miao xie 6 9.52% 1 12.50%
jeff mahoney jeff mahoney 2 3.17% 1 12.50%
Total 63 100.00% 8 100.00%



void btrfs_free_block_rsv(struct btrfs_fs_info *fs_info,
			  struct btrfs_block_rsv *rsv)
{
	if (!rsv)
		return;
	btrfs_block_rsv_release(fs_info, rsv, (u64)-1);
	kfree(rsv);
}

Contributors
Person Tokens Prop Commits CommitProp
zheng yan zheng yan 25 64.10% 3 42.86%
josef bacik josef bacik 6 15.38% 1 14.29%
chris mason chris mason 5 12.82% 2 28.57%
jeff mahoney jeff mahoney 3 7.69% 1 14.29%
Total 39 100.00% 7 100.00%



void __btrfs_free_block_rsv(struct btrfs_block_rsv *rsv)
{
	kfree(rsv);
}

Contributors
Person Tokens Prop Commits CommitProp
chris mason chris mason 11 73.33% 1 25.00%
zheng yan zheng yan 4 26.67% 3 75.00%
Total 15 100.00% 4 100.00%



int btrfs_block_rsv_add(struct btrfs_root *root,
			struct btrfs_block_rsv *block_rsv, u64 num_bytes,
			enum btrfs_reserve_flush_enum flush)
{
	int ret;

	if (num_bytes == 0)
		return 0;

	ret = reserve_metadata_bytes(root, block_rsv, num_bytes, flush);
	if (!ret) {
		block_rsv_add_bytes(block_rsv, num_bytes, 1);
		return 0;
	}

	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
zheng yan zheng yan 45 65.22% 3 21.43%
chris mason chris mason 14 20.29% 7 50.00%
miao xie miao xie 6 8.70% 2 14.29%
josef bacik josef bacik 4 5.80% 2 14.29%
Total 69 100.00% 14 100.00%



int btrfs_block_rsv_check(struct btrfs_block_rsv *block_rsv, int min_factor)
{
	u64 num_bytes = 0;
	int ret = -ENOSPC;

	if (!block_rsv)
		return 0;

	spin_lock(&block_rsv->lock);
	num_bytes = div_factor(block_rsv->size, min_factor);
	if (block_rsv->reserved >= num_bytes)
		ret = 0;
	spin_unlock(&block_rsv->lock);

	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
zheng yan zheng yan 42 56.76% 4 44.44%
josef bacik josef bacik 29 39.19% 3 33.33%
chris mason chris mason 3 4.05% 2 22.22%
Total 74 100.00% 9 100.00%



int btrfs_block_rsv_refill(struct btrfs_root *root,
			   struct btrfs_block_rsv *block_rsv, u64 min_reserved,
			   enum btrfs_reserve_flush_enum flush)
{
	u64 num_bytes = 0;
	int ret = -ENOSPC;

	if (!block_rsv)
		return 0;

	spin_lock(&block_rsv->lock);
	num_bytes = min_reserved;
	if (block_rsv->reserved >= num_bytes)
		ret = 0;
	else
		num_bytes -= block_rsv->reserved;
	spin_unlock(&block_rsv->lock);

	if (!ret)
		return 0;

	ret = reserve_metadata_bytes(root, block_rsv, num_bytes, flush);
	if (!ret) {
		block_rsv_add_bytes(block_rsv, num_bytes, 0);
		return 0;
	}

	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
zheng yan zheng yan 58 47.15% 5 35.71%
josef bacik josef bacik 55 44.72% 5 35.71%
miao xie miao xie 6 4.88% 2 14.29%
chris mason chris mason 4 3.25% 2 14.29%
Total 123 100.00% 14 100.00%



void btrfs_block_rsv_release(struct btrfs_fs_info *fs_info,
			     struct btrfs_block_rsv *block_rsv,
			     u64 num_bytes)
{
	struct btrfs_block_rsv *global_rsv = &fs_info->global_block_rsv;

	if (global_rsv == block_rsv ||
	    block_rsv->space_info != global_rsv->space_info)
		global_rsv = NULL;
	block_rsv_release_bytes(fs_info, block_rsv, global_rsv, num_bytes);
}

Contributors
Person Tokens Prop Commits CommitProp
zheng yan zheng yan 49 85.96% 6 66.67%
chris mason chris mason 4 7.02% 1 11.11%
jeff mahoney jeff mahoney 2 3.51% 1 11.11%
josef bacik josef bacik 2 3.51% 1 11.11%
Total 57 100.00% 9 100.00%



static void update_global_block_rsv(struct btrfs_fs_info *fs_info)
{
	struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv;
	struct btrfs_space_info *sinfo = block_rsv->space_info;
	u64 num_bytes;

	/*
         * The global block rsv is based on the size of the extent tree, the
         * checksum tree and the root tree.  If the fs is empty we want to set
         * it to a minimal amount for safety.
         */
	num_bytes = btrfs_root_used(&fs_info->extent_root->root_item) +
		btrfs_root_used(&fs_info->csum_root->root_item) +
		btrfs_root_used(&fs_info->tree_root->root_item);
	num_bytes = max_t(u64, num_bytes, SZ_16M);

	spin_lock(&sinfo->lock);
	spin_lock(&block_rsv->lock);

	block_rsv->size = min_t(u64, num_bytes, SZ_512M);

	if (block_rsv->reserved < block_rsv->size) {
		num_bytes = sinfo->bytes_used + sinfo->bytes_pinned +
			sinfo->bytes_reserved + sinfo->bytes_readonly +
			sinfo->bytes_may_use;
		if (sinfo->total_bytes > num_bytes) {
			num_bytes = sinfo->total_bytes - num_bytes;
			num_bytes = min(num_bytes,
					block_rsv->size - block_rsv->reserved);
			block_rsv->reserved += num_bytes;
			sinfo->bytes_may_use += num_bytes;
			trace_btrfs_space_reservation(fs_info, "space_info",
						      sinfo->flags, num_bytes,
						      1);
		}
	} else if (block_rsv->reserved > block_rsv->size) {
		num_bytes = block_rsv->reserved - block_rsv->size;
		sinfo->bytes_may_use -= num_bytes;
		trace_btrfs_space_reservation(fs_info, "space_info",
				      sinfo->flags, num_bytes, 0);
		block_rsv->reserved = block_rsv->size;
	}

	if (block_rsv->reserved == block_rsv->size)
		block_rsv->full = 1;
	else
		block_rsv->full = 0;

	spin_unlock(&block_rsv->lock);
	spin_unlock(&sinfo->lock);
}

Contributors
Person Tokens Prop Commits CommitProp
josef bacik josef bacik 135 46.39% 11 57.89%
zheng yan zheng yan 133 45.70% 3 15.79%
chris mason chris mason 14 4.81% 2 10.53%
stefan behrens stefan behrens 4 1.37% 1 5.26%
liu bo liu bo 4 1.37% 1 5.26%
byongho lee byongho lee 1 0.34% 1 5.26%
Total 291 100.00% 19 100.00%



static void init_global_block_rsv(struct btrfs_fs_info *fs_info)
{
	struct btrfs_space_info *space_info;

	space_info = __find_space_info(fs_info, BTRFS_BLOCK_GROUP_SYSTEM);
	fs_info->chunk_block_rsv.space_info = space_info;

	space_info = __find_space_info(fs_info, BTRFS_BLOCK_GROUP_METADATA);
	fs_info->global_block_rsv.space_info = space_info;
	fs_info->delalloc_block_rsv.space_info = space_info;
	fs_info->trans_block_rsv.space_info = space_info;
	fs_info->empty_block_rsv.space_info = space_info;
	fs_info->delayed_block_rsv.space_info = space_info;

	fs_info->extent_root->block_rsv = &fs_info->global_block_rsv;
	fs_info->csum_root->block_rsv = &fs_info->global_block_rsv;
	fs_info->dev_root->block_rsv = &fs_info->global_block_rsv;
	fs_info->tree_root->block_rsv = &fs_info->global_block_rsv;
	if (fs_info->quota_root)
		fs_info->quota_root->block_rsv = &fs_info->global_block_rsv;
	fs_info->chunk_root->block_rsv = &fs_info->chunk_block_rsv;

	update_global_block_rsv(fs_info);
}

Contributors
Person Tokens Prop Commits CommitProp
zheng yan zheng yan 127 79.87% 7 41.18%
stefan behrens stefan behrens 17 10.69% 1 5.88%
josef bacik josef bacik 12 7.55% 6 35.29%
chris mason chris mason 3 1.89% 3 17.65%
Total 159 100.00% 17 100.00%



static void release_global_block_rsv(struct btrfs_fs_info *fs_info)
{
	block_rsv_release_bytes(fs_info, &fs_info->global_block_rsv, NULL,
				(u64)-1);
	WARN_ON(fs_info->delalloc_block_rsv.size > 0);
	WARN_ON(fs_info->delalloc_block_rsv.reserved > 0);
	WARN_ON(fs_info->trans_block_rsv.size > 0);
	WARN_ON(fs_info->trans_block_rsv.reserved > 0);
	WARN_ON(fs_info->chunk_block_rsv.size > 0);
	WARN_ON(fs_info->chunk_block_rsv.reserved > 0);
	WARN_ON(fs_info->delayed_block_rsv.size > 0);
	WARN_ON(fs_info->delayed_block_rsv.reserved > 0);
}

Contributors
Person Tokens Prop Commits CommitProp
zheng yan zheng yan 84 71.79% 2 20.00%
josef bacik josef bacik 28 23.93% 4 40.00%
chris mason chris mason 5 4.27% 4 40.00%
Total 117 100.00% 10 100.00%



void btrfs_trans_release_metadata(struct btrfs_trans_handle *trans,
				  struct btrfs_fs_info *fs_info)
{
	if (!trans->block_rsv)
		return;

	if (!trans->bytes_reserved)
		return;

	trace_btrfs_space_reservation(fs_info, "transaction",
				      trans->transid, trans->bytes_reserved, 0);
	btrfs_block_rsv_release(fs_info, trans->block_rsv,
				trans->bytes_reserved);
	trans->bytes_reserved = 0;
}

Contributors
Person Tokens Prop Commits CommitProp
zheng yan zheng yan 32 47.76% 5 41.67%
josef bacik josef bacik 26 38.81% 3 25.00%
jeff mahoney jeff mahoney 6 8.96% 2 16.67%
liu bo liu bo 2 2.99% 1 8.33%
chris mason chris mason 1 1.49% 1 8.33%
Total 67 100.00% 12 100.00%

/*
 * To be called after all the new block groups attached to the transaction
 * handle have been created (btrfs_create_pending_block_groups()).
 */


void btrfs_trans_release_chunk_metadata(struct btrfs_trans_handle *trans)
{
	struct btrfs_fs_info *fs_info = trans->fs_info;

	if (!trans->chunk_bytes_reserved)
		return;

	WARN_ON_ONCE(!list_empty(&trans->new_bgs));

	block_rsv_release_bytes(fs_info, &fs_info->chunk_block_rsv, NULL,
				trans->chunk_bytes_reserved);
	trans->chunk_bytes_reserved = 0;
}

Contributors
Person Tokens Prop Commits CommitProp
filipe david borba manana filipe david borba manana 61 100.00% 1 100.00%
Total 61 100.00% 1 100.00%

/* Can only return 0 or -ENOSPC */


int btrfs_orphan_reserve_metadata(struct btrfs_trans_handle *trans,
				  struct inode *inode)
{
	struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
	struct btrfs_root *root = BTRFS_I(inode)->root;
	/*
         * We always use trans->block_rsv here as we will have reserved space
         * for our orphan when starting the transaction, using get_block_rsv()
         * here will sometimes make us choose the wrong block rsv as we could be
         * doing a reloc inode for a non refcounted root.
         */
	struct btrfs_block_rsv *src_rsv = trans->block_rsv;
	struct btrfs_block_rsv *dst_rsv = root->orphan_block_rsv;

	/*
         * We need to hold space in order to delete our orphan item once we've
         * added it, so this takes the reservation so we can release it later
         * when we are truly done with the orphan item.
         */
	u64 num_bytes = btrfs_calc_trans_metadata_size(fs_info, 1);

	trace_btrfs_space_reservation(fs_info, "orphan",
				      btrfs_ino(inode), num_bytes, 1);
	return btrfs_block_rsv_migrate(src_rsv, dst_rsv, num_bytes, 1);
}

Contributors
Person Tokens Prop Commits CommitProp
zheng yan zheng yan 56 57.73% 2 20.00%
josef bacik josef bacik 27 27.84% 5 50.00%
jeff mahoney jeff mahoney 13 13.40% 2 20.00%
miao xie miao xie 1 1.03% 1 10.00%
Total 97 100.00% 10 100.00%



void btrfs_orphan_release_metadata(struct inode *inode)
{
	struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
	struct btrfs_root *root = BTRFS_I(inode)->root;
	u64 num_bytes = btrfs_calc_trans_metadata_size(fs_info, 1);

	trace_btrfs_space_reservation(fs_info, "orphan",
				      btrfs_ino(inode), num_bytes, 0);
	btrfs_block_rsv_release(fs_info, root->orphan_block_rsv, num_bytes);
}

Contributors
Person Tokens Prop Commits CommitProp
zheng yan zheng yan 34 47.89% 3 30.00%
josef bacik josef bacik 22 30.99% 3 30.00%
jeff mahoney jeff mahoney 14 19.72% 3 30.00%
miao xie miao xie 1 1.41% 1 10.00%
Total 71 100.00% 10 100.00%

/*
 * btrfs_subvolume_reserve_metadata() - reserve space for subvolume operation
 * root: the root of the parent directory
 * rsv: block reservation
 * items: the number of items that we need do reservation
 * qgroup_reserved: used to return the reserved size in qgroup
 *
 * This function is used to reserve the space for snapshot/subvolume
 * creation and deletion. Those operations are different with the
 * common file/directory operations, they change two fs/file trees
 * and root tree, the number of items that the qgroup reserves is
 * different with the free space reservation. So we can not use
 * the space reservation mechanism in start_transaction().
 */


int btrfs_subvolume_reserve_metadata(struct btrfs_root *root,
				     struct btrfs_block_rsv *rsv,
				     int items,
				     u64 *qgroup_reserved,
				     bool use_global_rsv)
{
	u64 num_bytes;
	int ret;
	struct btrfs_fs_info *fs_info = root->fs_info;
	struct btrfs_block_rsv *global_rsv = &fs_info->global_block_rsv;

	if (test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags)) {
		/* One for parent inode, two for dir entries */
		num_bytes = 3 * fs_info->nodesize;
		ret = btrfs_qgroup_reserve_meta(root, num_bytes);
		if (ret)
			return ret;
	} else {
		num_bytes = 0;
	}

	*qgroup_reserved = num_bytes;

	num_bytes = btrfs_calc_trans_metadata_size(fs_info, items);
	rsv->space_info = __find_space_info(fs_info,
					    BTRFS_BLOCK_GROUP_METADATA);
	ret = btrfs_block_rsv_add(root, rsv, num_bytes,
				  BTRFS_RESERVE_FLUSH_ALL);

	if (ret == -ENOSPC && use_global_rsv)
		ret = btrfs_block_rsv_migrate(global_rsv, rsv, num_bytes, 1);

	if (ret && *qgroup_reserved)
		btrfs_qgroup_free_meta(root, *qgroup_reserved);

	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
miao xie miao xie 88 50.57% 2 11.76%
jeff mahoney jeff mahoney 45 25.86% 4 23.53%
zheng yan zheng yan 24 13.79% 5 29.41%
josef bacik josef bacik 13 7.47% 4 23.53%
qu wenruo qu wenruo 3 1.72% 1 5.88%
david sterba david sterba 1 0.57% 1 5.88%
Total 174 100.00% 17 100.00%



void btrfs_subvolume_release_metadata(struct btrfs_fs_info *fs_info,
				      struct btrfs_block_rsv *rsv,
				      u64 qgroup_reserved)
{
	btrfs_block_rsv_release(fs_info, rsv, (u64)-1);
}

Contributors
Person Tokens Prop Commits CommitProp
miao xie miao xie 28 90.32% 1 50.00%
jeff mahoney jeff mahoney 3 9.68% 1 50.00%
Total 31 100.00% 2 100.00%

/**
 * drop_outstanding_extent - drop an outstanding extent
 * @inode: the inode we're dropping the extent for
 * @num_bytes: the number of bytes we're releasing.
 *
 * This is called when we are freeing up an outstanding extent, either called
 * after an error or after an extent is written.  This will return the number of
 * reserved extents that need to be freed.  This must be called with
 * BTRFS_I(inode)->lock held.
 */


static unsigned drop_outstanding_extent(struct inode *inode, u64 num_bytes)
{
	unsigned drop_inode_space = 0;
	unsigned dropped_extents = 0;
	unsigned num_extents = 0;

	num_extents = (unsigned)div64_u64(num_bytes +
					  BTRFS_MAX_EXTENT_SIZE - 1,
					  BTRFS_MAX_EXTENT_SIZE);
	ASSERT(num_extents);
	ASSERT(BTRFS_I(inode)->outstanding_extents >= num_extents);
	BTRFS_I(inode)->outstanding_extents -= num_extents;

	if (BTRFS_I(inode)->outstanding_extents == 0 &&
	    test_and_clear_bit(BTRFS_INODE_DELALLOC_META_RESERVED,
			       &BTRFS_I(inode)->runtime_flags))
		drop_inode_space = 1;

	/*
         * If we have more or the same amount of outstanding extents than we have
         * reserved then we need to leave the reserved extents count alone.
         */
	if (BTRFS_I(inode)->outstanding_extents >=
	    BTRFS_I(inode)->reserved_extents)
		return drop_inode_space;

	dropped_extents = BTRFS_I(inode)->reserved_extents -
		BTRFS_I(inode)->outstanding_extents;
	BTRFS_I(inode)->reserved_extents -= dropped_extents;
	return dropped_extents + drop_inode_space;
}

Contributors
Person Tokens Prop Commits CommitProp
josef bacik josef bacik 148 99.33% 5 83.33%
nicholas d steeves nicholas d steeves 1 0.67% 1 16.67%
Total 149 100.00% 6 100.00%

/**
 * calc_csum_metadata_size - return the amount of metadata space that must be
 *      reserved/freed for the given bytes.
 * @inode: the inode we're manipulating
 * @num_bytes: the number of bytes in question
 * @reserve: 1 if we are reserving space, 0 if we are freeing space
 *
 * This adjusts the number of csum_bytes in the inode and then returns the
 * correct amount of metadata that must either be reserved or freed.  We
 * calculate how many checksums we can fit into one leaf and then divide the
 * number of bytes that will need to be checksumed by this value to figure out
 * how many checksums will be required.  If we are adding bytes then the number
 * may go up and we will return the number of additional bytes that must be
 * reserved.  If it is going down we will return the number of bytes that must
 * be freed.
 *
 * This must be called with BTRFS_I(inode)->lock held.
 */


static u64 calc_csum_metadata_size(struct inode *inode, u64 num_bytes,
				   int reserve)
{
	struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
	u64 old_csums, num_csums;

	if (BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM &&
	    BTRFS_I(inode)->csum_bytes == 0)
		return 0;

	old_csums = btrfs_csum_bytes_to_leaves(fs_info,
					       BTRFS_I(inode)->csum_bytes);
	if (reserve)
		BTRFS_I(inode)->csum_bytes += num_bytes;
	else
		BTRFS_I(inode)->csum_bytes -= num_bytes;
	num_csums = btrfs_csum_bytes_to_leaves(fs_info,
					       BTRFS_I(inode)->csum_bytes);

	/* No change, no need to reserve more */
	if (old_csums == num_csums)
		return 0;

	if (reserve)
		return btrfs_calc_trans_metadata_size(fs_info,
						      num_csums - old_csums);

	return btrfs_calc_trans_metadata_size(fs_info, old_csums - num_csums);
}

Contributors
Person Tokens Prop Commits CommitProp
josef bacik josef bacik 108 76.06% 2 16.67%
jeff mahoney jeff mahoney 15 10.56% 3 25.00%
zheng yan zheng yan 13 9.15% 4 33.33%
chris mason chris mason 6 4.23% 3 25.00%
Total 142 100.00% 12 100.00%



int btrfs_delalloc_reserve_metadata(struct inode *inode, u64 num_bytes)
{
	struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
	struct btrfs_root *root = BTRFS_I(inode)->root;
	struct btrfs_block_rsv *block_rsv = &fs_info->delalloc_block_rsv;
	u64 to_reserve = 0;
	u64 csum_bytes;
	unsigned nr_extents = 0;
	enum btrfs_reserve_flush_enum flush = BTRFS_RESERVE_FLUSH_ALL;
	int ret = 0;
	bool delalloc_lock = true;
	u64 to_free = 0;
	unsigned dropped;
	bool release_extra = false;

	/* If we are a free space inode we need to not flush since we will be in
         * the middle of a transaction commit.  We also don't need the delalloc
         * mutex since we won't race with anybody.  We need this mostly to make
         * lockdep shut its filthy mouth.
         *
         * If we have a transaction open (can happen if we call truncate_block
         * from truncate), then we need FLUSH_LIMIT so we don't deadlock.
         */
	if (btrfs_is_free_space_inode(inode)) {
		flush = BTRFS_RESERVE_NO_FLUSH;
		delalloc_lock = false;
	} else if (current->journal_info) {
		flush = BTRFS_RESERVE_FLUSH_LIMIT;
	}

	if (flush != BTRFS_RESERVE_NO_FLUSH &&
	    btrfs_transaction_in_commit(fs_info))
		schedule_timeout(1);

	if (delalloc_lock)
		mutex_lock(&BTRFS_I(inode)->delalloc_mutex);

	num_bytes = ALIGN(num_bytes, fs_info->sectorsize);

	spin_lock(&BTRFS_I(inode)->lock);
	nr_extents = (unsigned)div64_u64(num_bytes +
					 BTRFS_MAX_EXTENT_SIZE - 1,
					 BTRFS_MAX_EXTENT_SIZE);
	BTRFS_I(inode)->outstanding_extents += nr_extents;

	nr_extents = 0;
	if (BTRFS_I(inode)->outstanding_extents >
	    BTRFS_I(inode)->reserved_extents)
		nr_extents += BTRFS_I(inode)->outstanding_extents -
			BTRFS_I(inode)->reserved_extents;

	/* We always want to reserve a slot for updating the inode. */
	to_reserve = btrfs_calc_trans_metadata_size(fs_info, nr_extents + 1);
	to_reserve += calc_csum_metadata_size(inode, num_bytes, 1);
	csum_bytes = BTRFS_I(inode)->csum_bytes;
	spin_unlock(&BTRFS_I(inode)->lock);

	if (test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags)) {
		ret = btrfs_qgroup_reserve_meta(root,
				nr_extents * fs_info->nodesize);
		if (ret)
			goto out_fail;
	}

	ret = btrfs_block_rsv_add(root, block_rsv, to_reserve, flush);
	if (unlikely(ret)) {
		btrfs_qgroup_free_meta(root,
				       nr_extents * fs_info->nodesize);
		goto out_fail;
	}

	spin_lock(&BTRFS_I(inode)->lock);
	if (test_and_set_bit(BTRFS_INODE_DELALLOC_META_RESERVED,
			     &BTRFS_I(inode)->runtime_flags)) {
		to_reserve -= btrfs_calc_trans_metadata_size(fs_info, 1);
		release_extra = true;
	}
	BTRFS_I(inode)->reserved_extents += nr_extents;
	spin_unlock(&BTRFS_I(inode)->lock);

	if (delalloc_lock)
		mutex_unlock(&BTRFS_I(inode)->delalloc_mutex);

	if (to_reserve)
		trace_btrfs_space_reservation(fs_info, "delalloc",
					      btrfs_ino(inode), to_reserve, 1);
	if (release_extra)
		btrfs_block_rsv_release(fs_info, block_rsv,
				btrfs_calc_trans_metadata_size(fs_info, 1));
	return 0;

out_fail:
	spin_lock(&BTRFS_I(inode)->lock);
	dropped = drop_outstanding_extent(inode, num_bytes);
	/*
         * If the inodes csum_bytes is the same as the original
         * csum_bytes then we know we haven't raced with any free()ers
         * so we can just reduce our inodes csum bytes and carry on.
         */
	if (BTRFS_I(inode)->csum_bytes == csum_bytes) {
		calc_csum_metadata_size(inode, num_bytes, 0);
	} else {
		u64 orig_csum_bytes = BTRFS_I(inode)->csum_bytes;
		u64 bytes;

		/*
                 * This is tricky, but first we need to figure out how much we
                 * freed from any free-ers that occurred during this
                 * reservation, so we reset ->csum_bytes to the csum_bytes
                 * before we dropped our lock, and then call the free for the
                 * number of bytes that were freed while we were trying our
                 * reservation.
                 */
		bytes = csum_bytes - BTRFS_I(inode)->csum_bytes;
		BTRFS_I(inode)->csum_bytes = csum_bytes;
		to_free = calc_csum_metadata_size(inode, bytes, 0);


		/*
                 * Now we need to see how much we would have freed had we not
                 * been making this reservation and our ->csum_bytes were not
                 * artificially inflated.
                 */
		BTRFS_I(inode)->csum_bytes = csum_bytes - num_bytes;
		bytes = csum_bytes - orig_csum_bytes;
		bytes = calc_csum_metadata_size(inode, bytes, 0);

		/*
                 * Now reset ->csum_bytes to what it should be.  If bytes is
                 * more than to_free then we would have freed more space had we
                 * not had an artificially high ->csum_bytes, so we need to free
                 * the remainder.  If bytes is the same or less then we don't
                 * need to do anything, the other free-ers did the correct
                 * thing.
                 */
		BTRFS_I(inode)->csum_bytes = orig_csum_bytes - num_bytes;
		if (bytes > to_free)
			to_free = bytes - to_free;
		else
			to_free = 0;
	}
	spin_unlock(&BTRFS_I(inode)->lock);
	if (dropped)
		to_free += btrfs_calc_trans_metadata_size(fs_info, dropped);

	if (to_free) {
		btrfs_block_rsv_release(fs_info, block_rsv, to_free);
		trace_btrfs_space_reservation(fs_info, "delalloc",
					      btrfs_ino(inode), to_free, 0);
	}
	if (delalloc_lock)
		mutex_unlock(&BTRFS_I(inode)->delalloc_mutex);
	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
josef bacik josef bacik 406 59.01% 18 41.86%
wang shilong wang shilong 115 16.72% 2 4.65%
zheng yan zheng yan 85 12.35% 5 11.63%
chris mason chris mason 24 3.49% 6 13.95%
jeff mahoney jeff mahoney 24 3.49% 4 9.30%
arne jansen arne jansen 17 2.47% 1 2.33%
miao xie miao xie 9 1.31% 3 6.98%
qu wenruo qu wenruo 2 0.29% 1 2.33%
nicholas d steeves nicholas d steeves 2 0.29% 1 2.33%
jan schmidt jan schmidt 2 0.29% 1 2.33%
david sterba david sterba 2 0.29% 1 2.33%
Total 688 100.00% 43 100.00%

/**
 * btrfs_delalloc_release_metadata - release a metadata reservation for an inode
 * @inode: the inode to release the reservation for
 * @num_bytes: the number of bytes we're releasing
 *
 * This will release the metadata reservation for an inode.  This can be called
 * once we complete IO for a given set of bytes to release their metadata
 * reservations.
 */


void btrfs_delalloc_release_metadata(struct inode *inode, u64 num_bytes)
{
	struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
	u64 to_free = 0;
	unsigned dropped;

	num_bytes = ALIGN(num_bytes, fs_info->sectorsize);
	spin_lock(&BTRFS_I(inode)->lock);
	dropped = drop_outstanding_extent(inode, num_bytes);

	if (num_bytes)
		to_free = calc_csum_metadata_size(inode, num_bytes, 0);
	spin_unlock(&BTRFS_I(inode)->lock);
	if (dropped > 0)
		to_free += btrfs_calc_trans_metadata_size(fs_info, dropped);

	if (btrfs_is_testing(fs_info))
		return;

	trace_btrfs_space_reservation(fs_info, "delalloc",
				      btrfs_ino(inode), to_free, 0);

	btrfs_block_rsv_release(fs_info, &fs_info->delalloc_block_rsv, to_free);
}

Contributors
Person Tokens Prop Commits CommitProp
josef bacik josef bacik 58 41.13% 6 30.00%
zheng yan zheng yan 53 37.59% 6 30.00%
jeff mahoney jeff mahoney 17 12.06% 5 25.00%
chris mason chris mason 8 5.67% 1 5.00%
miao xie miao xie 5 3.55% 2 10.00%
Total 141 100.00% 20 100.00%

/**
 * btrfs_delalloc_reserve_space - reserve data and metadata space for
 * delalloc
 * @inode: inode we're writing to
 * @start: start range we are writing to
 * @len: how long the range we are writing to
 *
 * This will do the following things
 *
 * o reserve space in data space info for num bytes
 *   and reserve precious corresponding qgroup space
 *   (Done in check_data_free_space)
 *
 * o reserve space for metadata space, based on the number of outstanding
 *   extents and how much csums will be needed
 *   also reserve metadata space in a per root over-reserve method.
 * o add to the inodes->delalloc_bytes
 * o add it to the fs_info's delalloc inodes list.
 *   (Above 3 all done in delalloc_reserve_metadata)
 *
 * Return 0 for success
 * Return <0 for error(-ENOSPC or -EQUOT)
 */


int btrfs_delalloc_reserve_space(struct inode *inode, u64 start, u64 len)
{
	int ret;

	ret = btrfs_check_data_free_space(inode, start, len);
	if (ret < 0)
		return ret;
	ret = btrfs_delalloc_reserve_metadata(inode, len);
	if (ret < 0)
		btrfs_free_reserved_data_space(inode, start, len);
	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
qu wenruo qu wenruo 66 100.00% 2 100.00%
Total 66 100.00% 2 100.00%

/**
 * btrfs_delalloc_release_space - release data and metadata space for delalloc
 * @inode: inode we're releasing space for
 * @start: start position of the space already reserved
 * @len: the len of the space already reserved
 *
 * This must be matched with a call to btrfs_delalloc_reserve_space.  This is
 * called in the case that we don't need the metadata AND data reservations
 * anymore.  So if there is an error or we insert an inline extent.
 *
 * This function will release the metadata space that was not used and will
 * decrement ->delalloc_bytes and remove it from the fs_info delalloc_inodes
 * list if there are no delalloc bytes left.
 * Also it will handle the qgroup reserved space.
 */


void btrfs_delalloc_release_space(struct inode *inode, u64 start, u64 len)
{
	btrfs_delalloc_release_metadata(inode, len);
	btrfs_free_reserved_data_space(inode, start, len);
}

Contributors
Person Tokens Prop Commits CommitProp
qu wenruo qu wenruo 32 100.00% 2 100.00%
Total 32 100.00% 2 100.00%



static int update_block_group(struct btrfs_trans_handle *trans,
			      struct btrfs_fs_info *info, u64 bytenr,
			      u64 num_bytes, int alloc)
{
	struct btrfs_block_group_cache *cache = NULL;
	u64 total = num_bytes;
	u64 old_val;
	u64 byte_in_group;
	int factor;

	/* block accounting for super block */
	spin_lock(&info->delalloc_root_lock);
	old_val = btrfs_super_bytes_used(info->super_copy);
	if (alloc)
		old_val += num_bytes;
	else
		old_val -= num_bytes;
	btrfs_set_super_bytes_used(info->super_copy, old_val);
	spin_unlock(&info->delalloc_root_lock);

	while (total) {
		cache = btrfs_lookup_block_group(info, bytenr);
		if (!cache)
			return -ENOENT;
		if (cache->flags & (BTRFS_BLOCK_GROUP_DUP |
				    BTRFS_BLOCK_GROUP_RAID1 |
				    BTRFS_BLOCK_GROUP_RAID10))
			factor = 2;
		else
			factor = 1;
		/*
                 * If this block group has free space cache written out, we
                 * need to make sure to load it if we are removing space.  This
                 * is because we need the unpinning stage to actually add the
                 * space back to the block group, otherwise we will leak space.
                 */
		if (!alloc && cache->cached == BTRFS_CACHE_NO)
			cache_block_group(cache, 1);

		byte_in_group = bytenr - cache->key.objectid;
		WARN_ON(byte_in_group > cache->key.offset);

		spin_lock(&cache->space_info->lock);
		spin_lock(&cache->lock);

		if (btrfs_test_opt(info, SPACE_CACHE) &&
		    cache->disk_cache_state < BTRFS_DC_CLEAR)
			cache->disk_cache_state = BTRFS_DC_CLEAR;

		old_val = btrfs_block_group_used(&cache->item);
		num_bytes = min(total, cache->key.offset - byte_in_group);
		if (alloc) {
			old_val += num_bytes;
			btrfs_set_block_group_used(&cache->item, old_val);
			cache->reserved -= num_bytes;
			cache->space_info->bytes_reserved -= num_bytes;
			cache->space_info->bytes_used += num_bytes;
			cache->space_info->disk_used += num_bytes * factor;
			spin_unlock(&cache->lock);
			spin_unlock(&cache->space_info->lock);
		} else {
			old_val -= num_bytes;
			btrfs_set_block_group_used(&cache->item, old_val);
			cache->pinned += num_bytes;
			cache->space_info->bytes_pinned += num_bytes;
			cache->space_info->bytes_used -= num_bytes;
			cache->space_info->disk_used -= num_bytes * factor;
			spin_unlock(&cache->lock);
			spin_unlock(&cache->space_info->lock);

			trace_btrfs_space_reservation(info, "pinned",
						      cache->space_info->flags,
						      num_bytes, 1);
			set_extent_dirty(info->pinned_extents,
					 bytenr, bytenr + num_bytes - 1,
					 GFP_NOFS | __GFP_NOFAIL);
		}

		spin_lock(&trans->transaction->dirty_bgs_lock);
		if (list_empty(&cache->dirty_list)) {
			list_add_tail(&cache->dirty_list,
				      &trans->transaction->dirty_bgs);
				trans->transaction->num_dirty_bgs++;
			btrfs_get_block_group(cache);
		}
		spin_unlock(&trans->transaction->dirty_bgs_lock);

		/*
                 * No longer have used bytes in this block group, queue it for
                 * deletion. We do this after adding the block group to the
                 * dirty list to avoid races between cleaner kthread and space
                 * cache writeout.
                 */
		if (!alloc && old_val == 0) {
			spin_lock(&info->unused_bgs_lock);
			if (list_empty(&cache->bg_list)) {
				btrfs_get_block_group(cache);
				list_add_tail(&cache->bg_list,
					      &info->unused_bgs);
			}
			spin_unlock(&info->unused_bgs_lock);
		}

		btrfs_put_block_group(cache);
		total -= num_bytes;
		bytenr += num_bytes;
	}
	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
zheng yan zheng yan 315 57.17% 3 13.04%
chris mason chris mason 82 14.88% 8 34.78%
filipe david borba manana filipe david borba manana 78 14.16% 2 8.70%
josef bacik josef bacik 69 12.52% 6 26.09%
jeff mahoney jeff mahoney 5 0.91% 3 13.04%
miao xie miao xie 2 0.36% 1 4.35%
Total 551 100.00% 23 100.00%



static u64 first_logical_byte(struct btrfs_fs_info *fs_info, u64 search_start)
{
	struct btrfs_block_group_cache *cache;
	u64 bytenr;

	spin_lock(&fs_info->block_group_cache_lock);
	bytenr = fs_info->first_logical_byte;
	spin_unlock(&fs_info->block_group_cache_lock);

	if (bytenr < (u64)-1)
		return bytenr;

	cache = btrfs_lookup_first_block_group(fs_info, search_start);
	if (!cache)
		return 0;

	bytenr = cache->key.objectid;
	btrfs_put_block_group(cache);

	return bytenr;
}

Contributors
Person Tokens Prop Commits CommitProp
zheng yan zheng yan 43 47.78% 3 30.00%
liu bo liu bo 35 38.89% 1 10.00%
chris mason chris mason 10 11.11% 5 50.00%
jeff mahoney jeff mahoney 2 2.22% 1 10.00%
Total 90 100.00% 10 100.00%



static int pin_down_extent(struct btrfs_fs_info *fs_info,
			   struct btrfs_block_group_cache *cache,
			   u64 bytenr, u64 num_bytes, int reserved)
{
	spin_lock(&cache->space_info->lock);
	spin_lock(&cache->lock);
	cache->pinned += num_bytes;
	cache->space_info->bytes_pinned += num_bytes;
	if (reserved) {
		cache->reserved -= num_bytes;
		cache->space_info->bytes_reserved -= num_bytes;
	}
	spin_unlock(&cache->lock);
	spin_unlock(&cache->space_info->lock);

	trace_btrfs_space_reservation(fs_info, "pinned",
				      cache->space_info->flags, num_bytes, 1);
	set_extent_dirty(fs_info->pinned_extents, bytenr,
			 bytenr + num_bytes - 1, GFP_NOFS | __GFP_NOFAIL);
	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
zheng yan zheng yan 103 76.87% 3 30.00%
josef bacik josef bacik 21 15.67% 4 40.00%
chris mason chris mason 8 5.97% 2 20.00%
jeff mahoney jeff mahoney 2 1.49% 1 10.00%
Total 134 100.00% 10 100.00%

/*
 * this function must be called within transaction
 */


int btrfs_pin_extent(struct btrfs_fs_info *fs_info,
		     u64 bytenr, u64 num_bytes, int reserved)
{
	struct btrfs_block_group_cache *cache;

	cache = btrfs_lookup_block_group(fs_info, bytenr);
	BUG_ON(!cache); /* Logic error */

	pin_down_extent(fs_info, cache, bytenr, num_bytes, reserved);

	btrfs_put_block_group(cache);
	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
zheng yan zheng yan 45 73.77% 2 40.00%
chris mason chris mason 12 19.67% 1 20.00%
jeff mahoney jeff mahoney 4 6.56% 2 40.00%
Total 61 100.00% 5 100.00%

/*
 * this function must be called within transaction
 */


int btrfs_pin_extent_for_log_replay(struct btrfs_fs_info *fs_info,
				    u64 bytenr, u64 num_bytes)
{
	struct btrfs_block_group_cache *cache;
	int ret;

	cache = btrfs_lookup_block_group(fs_info, bytenr);
	if (!cache)
		return -EINVAL;

	/*
         * pull in the free space cache (if any) so that our pin
         * removes the free space from the cache.  We have load_only set
         * to one because the slow code to read in the free extents does check
         * the pinned extents.
         */
	cache_block_group(cache, 1);

	pin_down_extent(fs_info, cache, bytenr, num_bytes, 0);

	/* remove us from the free space cache (if we're there at all) */
	ret = btrfs_remove_free_space(cache, bytenr, num_bytes);
	btrfs_put_block_group(cache);
	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
chris mason chris mason 67 80.72% 1 33.33%
josef bacik josef bacik 13 15.66% 1 33.33%
jeff mahoney jeff mahoney 3 3.61% 1 33.33%
Total 83 100.00% 3 100.00%



static int __exclude_logged_extent(struct btrfs_fs_info *fs_info,
				   u64 start, u64 num_bytes)
{
	int ret;
	struct btrfs_block_group_cache *block_group;
	struct btrfs_caching_control *caching_ctl;

	block_group = btrfs_lookup_block_group(fs_info, start);
	if (!block_group)
		return -EINVAL;

	cache_block_group(block_group, 0);
	caching_ctl = get_caching_control(block_group);

	if (!caching_ctl) {
		/* Logic error */
		BUG_ON(!block_group_cache_done(block_group));
		ret = btrfs_remove_free_space(block_group, start, num_bytes);
	} else {
		mutex_lock(&caching_ctl->mutex);

		if (start >= caching_ctl->progress) {
			ret = add_excluded_extent(fs_info, start, num_bytes);
		} else if (start + num_bytes <= caching_ctl->progress) {
			ret = btrfs_remove_free_space(block_group,
						      start, num_bytes);
		} else {
			num_bytes = caching_ctl->progress - start;
			ret = btrfs_remove_free_space(block_group,
						      start, num_bytes);
			if (ret)
				goto out_lock;

			num_bytes = (start + num_bytes) -
				caching_ctl->progress;
			start = caching_ctl->progress;
			ret = add_excluded_extent(fs_info, start, num_bytes);
		}
out_lock:
		mutex_unlock(&caching_ctl->mutex);
		put_caching_control(caching_ctl);
	}
	btrfs_put_block_group(block_group);
	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
josef bacik josef bacik 223 98.24% 1 50.00%
jeff mahoney jeff mahoney 4 1.76% 1 50.00%
Total 227 100.00% 2 100.00%



int btrfs_exclude_logged_extents(struct btrfs_fs_info *fs_info,
				 struct extent_buffer *eb)
{
	struct btrfs_file_extent_item *item;
	struct btrfs_key key;
	int found_type;
	int i;

	if (!btrfs_fs_incompat(fs_info, MIXED_GROUPS))
		return 0;

	for (i = 0; i < btrfs_header_nritems(eb); i++) {
		btrfs_item_key_to_cpu(eb, &key, i);
		if (key.type != BTRFS_EXTENT_DATA_KEY)
			continue;
		item = btrfs_item_ptr(eb, i, struct btrfs_file_extent_item);
		found_type = btrfs_file_extent_type(eb, item);
		if (found_type == BTRFS_FILE_EXTENT_INLINE)
			continue;
		if (btrfs_file_extent_disk_bytenr(eb, item) == 0)
			continue;
		key.objectid = btrfs_file_extent_disk_bytenr(eb, item);
		key.offset = btrfs_file_extent_disk_num_bytes(eb, item);
		__exclude_logged_extent(fs_info, key.objectid, key.offset);
	}

	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
josef bacik josef bacik 155 98.10% 1 50.00%
jeff mahoney jeff mahoney 3 1.90% 1 50.00%
Total 158 100.00% 2 100.00%


static void

btrfs_inc_block_group_reservations(struct btrfs_block_group_cache *bg)
{
	atomic_inc(&bg->reservations);
}

Contributors
Person Tokens Prop Commits CommitProp
filipe david borba manana filipe david borba manana 19 100.00% 1 100.00%
Total 19 100.00% 1 100.00%



void btrfs_dec_block_group_reservations(struct btrfs_fs_info *fs_info,
					const u64 start)
{
	struct btrfs_block_group_cache *bg;

	bg = btrfs_lookup_block_group(fs_info, start);
	ASSERT(bg);
	if (atomic_dec_and_test(&bg->reservations))
		wake_up_atomic_t(&bg->reservations);
	btrfs_put_block_group(bg);
}

Contributors
Person Tokens Prop Commits CommitProp
filipe david borba manana filipe david borba manana 56 100.00% 1 100.00%
Total 56 100.00% 1 100.00%



static int btrfs_wait_bg_reservations_atomic_t(atomic_t *a)
{
	schedule();
	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
filipe david borba manana filipe david borba manana 16 100.00% 1 100.00%
Total 16 100.00% 1 100.00%



void btrfs_wait_block_group_reservations(struct btrfs_block_group_cache *bg)
{
	struct btrfs_space_info *space_info = bg->space_info;

	ASSERT(bg->ro);

	if (!(bg->flags & BTRFS_BLOCK_GROUP_DATA))
		return;

	/*
         * Our block group is read only but before we set it to read only,
         * some task might have had allocated an extent from it already, but it
         * has not yet created a respective ordered extent (and added it to a
         * root's list of ordered extents).
         * Therefore wait for any task currently allocating extents, since the
         * block group's reservations counter is incremented while a read lock
         * on the groups' semaphore is held and decremented after releasing
         * the read access on that semaphore and creating the ordered extent.
         */
	down_write(&space_info->groups_sem);
	up_write(&space_info->groups_sem);

	wait_on_atomic_t(&bg->reservations,
			 btrfs_wait_bg_reservations_atomic_t,
			 TASK_UNINTERRUPTIBLE);
}

Contributors
Person Tokens Prop Commits CommitProp
filipe david borba manana filipe david borba manana 67 100.00% 1 100.00%
Total 67 100.00% 1 100.00%

/**
 * btrfs_add_reserved_bytes - update the block_group and space info counters
 * @cache:      The cache we are manipulating
 * @ram_bytes:  The number of bytes of file content, and will be same to
 *              @num_bytes except for the compress path.
 * @num_bytes:  The number of bytes in question
 * @delalloc:   The blocks are allocated for the delalloc write
 *
 * This is called by the allocator when it reserves space. If this is a
 * reservation and the block group has become read only we cannot make the
 * reservation and return -EAGAIN, otherwise this function always succeeds.
 */


static int btrfs_add_reserved_bytes(struct btrfs_block_group_cache *cache,
				    u64 ram_bytes, u64 num_bytes, int delalloc)
{
	struct btrfs_space_info *space_info = cache->space_info;
	int ret = 0;

	spin_lock(&space_info->lock);
	spin_lock(&cache->lock);
	if (cache->ro) {
		ret = -EAGAIN;
	} else {
		cache->reserved += num_bytes;
		space_info->bytes_reserved += num_bytes;

		trace_btrfs_space_reservation(cache->fs_info,
				"space_info", space_info->flags,
				ram_bytes, 0);
		space_info->bytes_may_use -= ram_bytes;
		if (delalloc)
			cache->delalloc_bytes += num_bytes;
	}
	spin_unlock(&cache->lock);
	spin_unlock(&space_info->lock);
	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
zheng yan zheng yan 56 43.08% 2 18.18%
wang xiaoguang wang xiaoguang 25 19.23% 2 18.18%
josef bacik josef bacik 25 19.23% 2 18.18%
miao xie miao xie 13 10.00% 1 9.09%
chris mason chris mason 9 6.92% 3 27.27%
liu bo liu bo 2 1.54% 1 9.09%
Total 130 100.00% 11 100.00%

/**
 * btrfs_free_reserved_bytes - update the block_group and space info counters
 * @cache:      The cache we are manipulating
 * @num_bytes:  The number of bytes in question
 * @delalloc:   The blocks are allocated for the delalloc write
 *
 * This is called by somebody who is freeing space that was never actually used
 * on disk.  For example if you reserve some space for a new leaf in transaction
 * A and before transaction A commits you free that leaf, you call this with
 * reserve set to 0 in order to clear the reservation.
 */



static int btrfs_free_reserved_bytes(struct btrfs_block_group_cache *cache,
				     u64 num_bytes, int delalloc)
{
	struct btrfs_space_info *space_info = cache->space_info;
	int ret = 0;

	spin_lock(&space_info->lock);
	spin_lock(&cache->lock);
	if (cache->ro)
		space_info->bytes_readonly += num_bytes;
	cache->reserved -= num_bytes;
	space_info->bytes_reserved -= num_bytes;

	if (delalloc)
		cache->delalloc_bytes -= num_bytes;
	spin_unlock(&cache->lock);
	spin_unlock(&space_info->lock);
	return ret;
}
Contributors
Person Tokens Prop Commits CommitProp
wang xiaoguang wang xiaoguang 45 45.00% 1 20.00%
zheng yan zheng yan 40 40.00% 2 40.00%
miao xie miao xie 10 10.00% 1 20.00%
chris mason chris mason 5 5.00% 1 20.00%
Total 100 100.00% 5 100.00%



void btrfs_prepare_extent_commit(struct btrfs_trans_handle *trans,
				struct btrfs_fs_info *fs_info)
{
	struct btrfs_caching_control *next;
	struct btrfs_caching_control *caching_ctl;
	struct btrfs_block_group_cache *cache;

	down_write(&fs_info->commit_root_sem);

	list_for_each_entry_safe(caching_ctl, next,
				 &fs_info->caching_block_groups, list) {
		cache = caching_ctl->block_group;
		if (block_group_cache_done(cache)) {
			cache->last_byte_to_unpin = (u64)-1;
			list_del_init(&caching_ctl->list);
			put_caching_control(caching_ctl);
		} else {
			cache->last_byte_to_unpin = caching_ctl->progress;
		}
	}

	if (fs_info->pinned_extents == &fs_info->freed_extents[0])
		fs_info->pinned_extents = &fs_info->freed_extents[1];
	else
		fs_info->pinned_extents = &fs_info->freed_extents[0];

	up_write(&fs_info->commit_root_sem);

	update_global_block_rsv(fs_info);
}

Contributors
Person Tokens Prop Commits CommitProp
zheng yan zheng yan 103 68.21% 4 33.33%
chris mason chris mason 43 28.48% 5 41.67%
jeff mahoney jeff mahoney 3 1.99% 2 16.67%
josef bacik josef bacik 2 1.32% 1 8.33%
Total 151 100.00% 12 100.00%

/*
 * Returns the free cluster for the given space info and sets empty_cluster to
 * what it should be based on the mount options.
 */

static struct btrfs_free_cluster *

fetch_cluster_info(struct btrfs_fs_info *fs_info,
		   struct btrfs_space_info *space_info, u64 *empty_cluster)
{
	struct btrfs_free_cluster *ret = NULL;
	bool ssd = btrfs_test_opt(fs_info, SSD);

	*empty_cluster = 0;
	if (btrfs_mixed_space_info(space_info))
		return ret;

	if (ssd)
		*empty_cluster = SZ_2M;
	if (space_info->flags & BTRFS_BLOCK_GROUP_METADATA) {
		ret = &fs_info->meta_alloc_cluster;
		if (!ssd)
			*empty_cluster = SZ_64K;
	} else if ((space_info->flags & BTRFS_BLOCK_GROUP_DATA) && ssd) {
		ret = &fs_info->data_alloc_cluster;
	}

	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
josef bacik josef bacik 110 95.65% 1 25.00%
jeff mahoney jeff mahoney 3 2.61% 2 50.00%
byongho lee byongho lee 2 1.74% 1 25.00%
Total 115 100.00% 4 100.00%



static int unpin_extent_range(struct btrfs_fs_info *fs_info,
			      u64 start, u64 end,
			      const bool return_free_space)
{
	struct btrfs_block_group_cache *cache = NULL;
	struct btrfs_space_info *space_info;
	struct btrfs_block_rsv *global_rsv = &fs_info->global_block_rsv;
	struct btrfs_free_cluster *cluster = NULL;
	u64 len;
	u64 total_unpinned = 0;
	u64 empty_cluster = 0;
	bool readonly;

	while (start <= end) {
		readonly = false;
		if (!cache ||
		    start >= cache->key.objectid + cache->key.offset) {
			if (cache)
				btrfs_put_block_group(cache);
			total_unpinned = 0;
			cache = btrfs_lookup_block_group(fs_info, start);
			BUG_ON(!cache); /* Logic error */

			cluster = fetch_cluster_info(fs_info,
						     cache->space_info,
						     &empty_cluster);
			empty_cluster <<= 1;
		}

		len = cache->key.objectid + cache->key.offset - start;
		len = min(len, end + 1 - start);

		if (start < cache->last_byte_to_unpin) {
			len = min(len, cache->last_byte_to_unpin - start);
			if (return_free_space)
				btrfs_add_free_space(cache, start, len);
		}

		start += len;
		total_unpinned += len;
		space_info = cache->space_info;

		/*
                 * If this space cluster has been marked as fragmented and we've
                 * unpinned enough in this block group to potentially allow a
                 * cluster to be created inside of it go ahead and clear the
                 * fragmented check.
                 */
		if (cluster && cluster->fragmented &&
		    total_unpinned > empty_cluster) {
			spin_lock(&cluster->lock);
			cluster->fragmented = 0;
			spin_unlock(&cluster->lock);
		}

		spin_lock(&space_info->lock);
		spin_lock(&cache->lock);
		cache->pinned -= len;
		space_info->bytes_pinned -= len;

		trace_btrfs_space_reservation(fs_info, "pinned",
					      space_info->flags, len, 0);
		space_info->max_extent_size = 0;
		percpu_counter_add(&space_info->total_bytes_pinned, -len);
		if (cache->ro) {
			space_info->bytes_readonly += len;
			readonly = true;
		}
		spin_unlock(&cache->lock);
		if (!readonly && return_free_space &&
		    global_rsv->space_info == space_info) {
			u64 to_add = len;
			WARN_ON(!return_free_space);
			spin_lock(&global_rsv->lock);
			if (!global_rsv->full) {
				to_add = min(len, global_rsv->size -
					     global_rsv->reserved);
				global_rsv->reserved += to_add;
				space_info->bytes_may_use += to_add;
				if (global_rsv->reserved >= global_rsv->size)
					global_rsv->full = 1;
				trace_btrfs_space_reservation(fs_info,
							      "space_info",
							      space_info->flags,
							      to_add, 1);
				len -= to_add;
			}
			spin_unlock(&global_rsv->lock);
			/* Add to any tickets we may have */
			if (len)
				space_info_add_new_bytes(fs_info, space_info,
							 len);
		}
		spin_unlock(&space_info->lock);
	}

	if (cache)
		btrfs_put_block_group(cache);
	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
josef bacik josef bacik 260 52.53% 5 35.71%
zheng yan zheng yan 187 37.78% 3 21.43%
chris mason chris mason 25 5.05% 2 14.29%
liu bo liu bo 11 2.22% 1 7.14%
filipe david borba manana filipe david borba manana 8 1.62% 1 7.14%
jeff mahoney jeff mahoney 4 0.81% 2 14.29%
Total 495 100.00% 14 100.00%



int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans,
			       struct btrfs_fs_info *fs_info)
{
	struct btrfs_block_group_cache *block_group, *tmp;
	struct list_head *deleted_bgs;
	struct extent_io_tree *unpin;
	u64 start;
	u64 end;
	int ret;

	if (fs_info->pinned_extents == &fs_info->freed_extents[0])
		unpin = &fs_info->freed_extents[1];
	else
		unpin = &fs_info->freed_extents[0];

	while (!trans->aborted) {
		mutex_lock(&fs_info->unused_bg_unpin_mutex);
		ret = find_first_extent_bit(unpin, 0, &start, &end,
					    EXTENT_DIRTY, NULL);
		if (ret) {
			mutex_unlock(&fs_info->unused_bg_unpin_mutex);
			break;
		}

		if (btrfs_test_opt(fs_info, DISCARD))
			ret = btrfs_discard_extent(fs_info, start,
						   end + 1 - start, NULL);

		clear_extent_dirty(unpin, start, end);
		unpin_extent_range(fs_info, start, end, true);
		mutex_unlock(&fs_info->unused_bg_unpin_mutex);
		cond_resched();
	}

	/*
         * Transaction is finished.  We don't need the lock anymore.  We
         * do need to clean up the block groups in case of a transaction
         * abort.
         */
	deleted_bgs = &trans->transaction->deleted_bgs;
	list_for_each_entry_safe(block_group, tmp, deleted_bgs, bg_list) {
		u64 trimmed = 0;

		ret = -EROFS;
		if (!trans->aborted)
			ret = btrfs_discard_extent(fs_info,
						   block_group->key.objectid,
						   block_group->key.offset,
						   &trimmed);

		list_del_init(&block_group->bg_list);
		btrfs_put_block_group_trimming(block_group);
		btrfs_put_block_group(block_group);

		if (ret) {
			const char *errstr = btrfs_decode_error(ret);
			btrfs_warn(fs_info,
				   "Discard failed while removing blockgroup: errno=%d %s\n",
				   ret, errstr);
		}
	}

	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
jeff mahoney jeff mahoney 128 43.54% 3 33.33%
zheng yan zheng yan 126 42.86% 2 22.22%
filipe david borba manana filipe david borba manana 28 9.52% 2 22.22%
li dongyang li dongyang 10 3.40% 1 11.11%
josef bacik josef bacik 2 0.68% 1 11.11%
Total 294 100.00% 9 100.00%



static void add_pinned_bytes(struct btrfs_fs_info *fs_info, u64 num_bytes,
			     u64 owner, u64 root_objectid)
{
	struct btrfs_space_info *space_info;
	u64 flags;

	if (owner < BTRFS_FIRST_FREE_OBJECTID) {
		if (root_objectid == BTRFS_CHUNK_TREE_OBJECTID)
			flags = BTRFS_BLOCK_GROUP_SYSTEM;
		else
			flags = BTRFS_BLOCK_GROUP_METADATA;
	} else {
		flags = BTRFS_BLOCK_GROUP_DATA;
	}

	space_info = __find_space_info(fs_info, flags);
	BUG_ON(!space_info); /* Logic bug */
	percpu_counter_add(&space_info->total_bytes_pinned, num_bytes);
}


Contributors
Person Tokens Prop Commits CommitProp
josef bacik josef bacik 84 100.00% 1 100.00%
Total 84 100.00% 1 100.00%



static int __btrfs_free_extent(struct btrfs_trans_handle *trans,
				struct btrfs_fs_info *info,
				struct btrfs_delayed_ref_node *node, u64 parent,
				u64 root_objectid, u64 owner_objectid,
				u64 owner_offset, int refs_to_drop,
				struct btrfs_delayed_extent_op *extent_op)
{
	struct btrfs_key key;
	struct btrfs_path *path;
	struct btrfs_root *extent_root = info->extent_root;
	struct extent_buffer *leaf;
	struct btrfs_extent_item *ei;
	struct btrfs_extent_inline_ref *iref;
	int ret;
	int is_data;
	int extent_slot = 0;
	int found_extent = 0;
	int num_to_del = 1;
	u32 item_size;
	u64 refs;
	u64 bytenr = node->bytenr;
	u64 num_bytes = node->num_bytes;
	int last_ref = 0;
	bool skinny_metadata = btrfs_fs_incompat(info, SKINNY_METADATA);

	path = btrfs_alloc_path();
	if (!path)
		return -ENOMEM;

	path->reada = READA_FORWARD;
	path->leave_spinning = 1;

	is_data = owner_objectid >= BTRFS_FIRST_FREE_OBJECTID;
	BUG_ON(!is_data && refs_to_drop != 1);

	if (is_data)
		skinny_metadata = 0;

	ret = lookup_extent_backref(trans, extent_root, path, &iref,
				    bytenr, num_bytes, parent,
				    root_objectid, owner_objectid,
				    owner_offset);
	if (ret == 0) {
		extent_slot = path->slots[0];
		while (extent_slot >= 0) {
			btrfs_item_key_to_cpu(path->nodes[0], &key,
					      extent_slot);
			if (key.objectid != bytenr)
				break;
			if (key.type == BTRFS_EXTENT_ITEM_KEY &&
			    key.offset == num_bytes) {
				found_extent = 1;
				break;
			}
			if (key.type == BTRFS_METADATA_ITEM_KEY &&
			    key.offset == owner_objectid) {
				found_extent = 1;
				break;
			}
			if (path->slots[0] - extent_slot > 5)
				break;
			extent_slot--;
		}
#ifdef BTRFS_COMPAT_EXTENT_TREE_V0
		item_size = btrfs_item_size_nr(path->nodes[0], extent_slot);
		if (found_extent && item_size < sizeof(*ei))
			found_extent = 0;
#endif
		if (!found_extent) {
			BUG_ON(iref);
			ret = remove_extent_backref(trans, extent_root, path,
						    NULL, refs_to_drop,
						    is_data, &last_ref);
			if (ret) {
				btrfs_abort_transaction(trans, ret);
				goto out;
			}
			btrfs_release_path(path);
			path->leave_spinning = 1;

			key.objectid = bytenr;
			key.type = BTRFS_EXTENT_ITEM_KEY;
			key.offset = num_bytes;

			if (!is_data && skinny_metadata) {
				key.type = BTRFS_METADATA_ITEM_KEY;
				key.offset = owner_objectid;
			}

			ret = btrfs_search_slot(trans, extent_root,
						&key, path, -1, 1);
			if (ret > 0 && skinny_metadata && path->slots[0]) {
				/*
                                 * Couldn't find our skinny metadata item,
                                 * see if we have ye olde extent item.
                                 */
				path->slots[0]--;
				btrfs_item_key_to_cpu(path->nodes[0], &key,
						      path->slots[0]);
				if (key.objectid == bytenr &&
				    key.type == BTRFS_EXTENT_ITEM_KEY &&
				    key.offset == num_bytes)
					ret = 0;
			}

			if (ret > 0 && skinny_metadata) {
				skinny_metadata = false;
				key.objectid = bytenr;
				key.type = BTRFS_EXTENT_ITEM_KEY;
				key.offset = num_bytes;
				btrfs_release_path(path);
				ret = btrfs_search_slot(trans, extent_root,
							&key, path, -1, 1);
			}

			if (ret) {
				btrfs_err(info,
					  "umm, got %d back from search, was looking for %llu",
					  ret, bytenr);
				if (ret > 0)
					btrfs_print_leaf(info, path->nodes[0]);
			}
			if (ret < 0) {
				btrfs_abort_transaction(trans, ret);
				goto out;
			}
			extent_slot = path->slots[0];
		}
	} else if (WARN_ON(ret == -ENOENT)) {
		btrfs_print_leaf(info, path->nodes[0]);
		btrfs_err(info,
			"unable to find ref byte nr %llu parent %llu root %llu  owner %llu offset %llu",
			bytenr, parent, root_objectid, owner_objectid,
			owner_offset);
		btrfs_abort_transaction(trans, ret);
		goto out;
	} else {
		btrfs_abort_transaction(trans, ret);
		goto out;
	}

	leaf = path->nodes[0];
	item_size = btrfs_item_size_nr(leaf, extent_slot);
#ifdef BTRFS_COMPAT_EXTENT_TREE_V0
	if (item_size < sizeof(*ei)) {
		BUG_ON(found_extent || extent_slot != path->slots[0]);
		ret = convert_extent_item_v0(trans, extent_root, path,
					     owner_objectid, 0);
		if (ret < 0) {
			btrfs_abort_transaction(trans, ret);
			goto out;
		}

		btrfs_release_path(path);
		path->leave_spinning = 1;

		key.objectid = bytenr;
		key.type = BTRFS_EXTENT_ITEM_KEY;
		key.offset = num_bytes;

		ret = btrfs_search_slot(trans, extent_root, &key, path,
					-1, 1);
		if (ret) {
			btrfs_err(info,
				  "umm, got %d back from search, was looking for %llu",
				ret, bytenr);
			btrfs_print_leaf(info, path->nodes[0]);
		}
		if (ret < 0) {
			btrfs_abort_transaction(trans, ret);
			goto out;
		}

		extent_slot = path->slots[0];
		leaf = path->nodes[0];
		item_size = btrfs_item_size_nr(leaf, extent_slot);
	}
#endif
	BUG_ON(item_size < sizeof(*ei));
	ei = btrfs_item_ptr(leaf, extent_slot,
			    struct btrfs_extent_item);
	if (owner_objectid < BTRFS_FIRST_FREE_OBJECTID &&
	    key.type == BTRFS_EXTENT_ITEM_KEY) {
		struct btrfs_tree_block_info *bi;
		BUG_ON(item_size < sizeof(*ei) + sizeof(*bi));
		bi = (struct btrfs_tree_block_info *)(ei + 1);
		WARN_ON(owner_objectid != btrfs_tree_block_level(leaf, bi));
	}

	refs = btrfs_extent_refs(leaf, ei);
	if (refs < refs_to_drop) {
		btrfs_err(info,
			  "trying to drop %d refs but we only have %Lu for bytenr %Lu",
			  refs_to_drop, refs, bytenr);
		ret = -EINVAL;
		btrfs_abort_transaction(trans, ret);
		goto out;
	}
	refs -= refs_to_drop;

	if (refs > 0) {
		if (extent_op)
			__run_delayed_extent_op(extent_op, leaf, ei);
		/*
                 * In the case of inline back ref, reference count will
                 * be updated by remove_extent_backref
                 */
		if (iref) {
			BUG_ON(!found_extent);
		} else {
			btrfs_set_extent_refs(leaf, ei, refs);
			btrfs_mark_buffer_dirty(leaf);
		}
		if (found_extent) {
			ret = remove_extent_backref(trans, extent_root, path,
						    iref, refs_to_drop,
						    is_data, &last_ref);
			if (ret) {
				btrfs_abort_transaction(trans, ret);
				goto out;
			}
		}
		add_pinned_bytes(info, -num_bytes, owner_objectid,
				 root_objectid);
	} else {
		if (found_extent) {
			BUG_ON(is_data && refs_to_drop !=
			       extent_data_ref_count(path, iref));
			if (iref) {
				BUG_ON(path->slots[0] != extent_slot);
			} else {
				BUG_ON(path->slots[0] != extent_slot + 1);
				path->slots[0] = extent_slot;
				num_to_del = 2;
			}
		}

		last_ref = 1;
		ret = btrfs_del_items(trans, extent_root, path, path->slots[0],
				      num_to_del);
		if (ret) {
			btrfs_abort_transaction(trans, ret);
			goto out;
		}
		btrfs_release_path(path);

		if (is_data) {
			ret = btrfs_del_csums(trans, info, bytenr, num_bytes);
			if (ret) {
				btrfs_abort_transaction(trans, ret);
				goto out;
			}
		}

		ret = add_to_free_space_tree(trans, info, bytenr, num_bytes);
		if (ret) {
			btrfs_abort_transaction(trans, ret);
			goto out;
		}

		ret = update_block_group(trans, info, bytenr, num_bytes, 0);
		if (ret) {
			btrfs_abort_transaction(trans, ret);
			goto out;
		}
	}
	btrfs_release_path(path);

out:
	btrfs_free_path(path);
	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
zheng yan zheng yan 788 56.81% 4 11.43%
josef bacik josef bacik 295 21.27% 10 28.57%
david sterba david sterba 89 6.42% 2 5.71%
chris mason chris mason 78 5.62% 9 25.71%
jeff mahoney jeff mahoney 70 5.05% 5 14.29%
omar sandoval omar sandoval 28 2.02% 1 2.86%
qu wenruo qu wenruo 18 1.30% 1 2.86%
simon kirby simon kirby 12 0.87% 1 2.86%
filipe david borba manana filipe david borba manana 6 0.43% 1 2.86%
dulshani gunawardhana dulshani gunawardhana 3 0.22% 1 2.86%
Total 1387 100.00% 35 100.00%

/*
 * when we free an block, it is possible (and likely) that we free the last
 * delayed ref for that extent as well.  This searches the delayed ref tree for
 * a given extent, and if there are no other delayed refs to be processed, it
 * removes it from the tree.
 */


static noinline int check_ref_cleanup(struct btrfs_trans_handle *trans,
				      u64 bytenr)
{
	struct btrfs_delayed_ref_head *head;
	struct btrfs_delayed_ref_root *delayed_refs;
	int ret = 0;

	delayed_refs = &trans->transaction->delayed_refs;
	spin_lock(&delayed_refs->lock);
	head = btrfs_find_delayed_ref_head(trans, bytenr);
	if (!head)
		goto out_delayed_unlock;

	spin_lock(&head->lock);
	if (!list_empty(&head->ref_list))
		goto out;

	if (head->extent_op) {
		if (!head->must_insert_reserved)
			goto out;
		btrfs_free_delayed_extent_op(head->extent_op);
		head->extent_op = NULL;
	}

	/*
         * waiting for the lock here would deadlock.  If someone else has it
         * locked they are already in the process of dropping it anyway
         */
	if (!mutex_trylock(&head->mutex))
		goto out;

	/*
         * at this point we have a head with no other entries.  Go
         * ahead and process it.
         */
	head->node.in_tree = 0;
	rb_erase(&head->href_node, &delayed_refs->href_root);

	atomic_dec(&delayed_refs->num_entries);

	/*
         * we don't take a ref on the node because we're removing it from the
         * tree, so we just steal the ref the tree was holding.
         */
	delayed_refs->num_heads--;
	if (head->processing == 0)
		delayed_refs->num_heads_ready--;
	head->processing = 0;
	spin_unlock(&head->lock);
	spin_unlock(&delayed_refs->lock);

	BUG_ON(head->extent_op);
	if (head->must_insert_reserved)
		ret = 1;

	mutex_unlock(&head->mutex);
	btrfs_put_delayed_ref(&head->node);
	return ret;
out:
	spin_unlock(&head->lock);

out_delayed_unlock:
	spin_unlock(&delayed_refs->lock);
	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
zheng yan zheng yan 201 76.72% 3 25.00%
josef bacik josef bacik 32 12.21% 3 25.00%
chris mason chris mason 17 6.49% 3 25.00%
liu bo liu bo 8 3.05% 1 8.33%
qu wenruo qu wenruo 3 1.15% 1 8.33%
miao xie miao xie 1 0.38% 1 8.33%
Total 262 100.00% 12 100.00%



void btrfs_free_tree_block(struct btrfs_trans_handle *trans,
			   struct btrfs_root *root,
			   struct extent_buffer *buf,
			   u64 parent, int last_ref)
{
	struct btrfs_fs_info *fs_info = root->fs_info;
	int pin = 1;
	int ret;

	if (root->root_key.objectid != BTRFS_TREE_LOG_OBJECTID) {
		ret = btrfs_add_delayed_tree_ref(fs_info, trans,
						 buf->start, buf->len,
						 parent,
						 root->root_key.objectid,
						 btrfs_header_level(buf),
						 BTRFS_DROP_DELAYED_REF, NULL);
		BUG_ON(ret); /* -ENOMEM */
	}

	if (!last_ref)
		return;

	if (btrfs_header_generation(buf) == trans->transid) {
		struct btrfs_block_group_cache *cache;

		if (root->root_key.objectid != BTRFS_TREE_LOG_OBJECTID) {
			ret = check_ref_cleanup(trans, buf->start);
			if (!ret)
				goto out;
		}

		cache = btrfs_lookup_block_group(fs_info, buf->start);

		if (btrfs_header_flag(buf, BTRFS_HEADER_FLAG_WRITTEN)) {
			pin_down_extent(fs_info, cache, buf->start,
					buf->len, 1);
			btrfs_put_block_group(cache);
			goto out;
		}

		WARN_ON(test_bit(EXTENT_BUFFER_DIRTY, &buf->bflags));

		btrfs_add_free_space(cache, buf->start, buf->len);
		btrfs_free_reserved_bytes(cache, buf->len, 0);
		btrfs_put_block_group(cache);
		trace_btrfs_reserved_extent_free(fs_info, buf->start, buf->len);
		pin = 0;
	}
out:
	if (pin)
		add_pinned_bytes(fs_info, buf->len, btrfs_header_level(buf),
				 root->root_key.objectid);

	/*
         * Deleting the buffer, clear the corrupt flag since it doesn't matter
         * anymore.
         */
	clear_bit(EXTENT_BUFFER_CORRUPT, &buf->bflags);
}

Contributors
Person Tokens Prop Commits CommitProp
zheng yan zheng yan 154 52.56% 3 13.64%
josef bacik josef bacik 58 19.80% 4 18.18%
chris mason chris mason 39 13.31% 7 31.82%
filipe david borba manana filipe david borba manana 26 8.87% 1 4.55%
jeff mahoney jeff mahoney 12 4.10% 4 18.18%
arne jansen arne jansen 2 0.68% 1 4.55%
wang xiaoguang wang xiaoguang 1 0.34% 1 4.55%
miao xie miao xie 1 0.34% 1 4.55%
Total 293 100.00% 22 100.00%

/* Can return -ENOMEM */


int btrfs_free_extent(struct btrfs_trans_handle *trans,
		      struct btrfs_fs_info *fs_info,
		      u64 bytenr, u64 num_bytes, u64 parent, u64 root_objectid,
		      u64 owner, u64 offset)
{
	int ret;

	if (btrfs_is_testing(fs_info))
		return 0;

	add_pinned_bytes(fs_info, num_bytes, owner, root_objectid);

	/*
         * tree log blocks never actually go into the extent allocation
         * tree, just update pinning info and exit early.
         */
	if (root_objectid == BTRFS_TREE_LOG_OBJECTID) {
		WARN_ON(owner >= BTRFS_FIRST_FREE_OBJECTID);
		/* unlocks the pinned mutex */
		btrfs_pin_extent(fs_info, bytenr, num_bytes, 1);
		ret = 0;
	} else if (owner < BTRFS_FIRST_FREE_OBJECTID) {
		ret = btrfs_add_delayed_tree_ref(fs_info, trans, bytenr,
					num_bytes,
					parent, root_objectid, (int)owner,
					BTRFS_DROP_DELAYED_REF, NULL);
	} else {
		ret = btrfs_add_delayed_data_ref(fs_info, trans, bytenr,
						num_bytes,
						parent, root_objectid, owner,
						offset, 0,
						BTRFS_DROP_DELAYED_REF, NULL);
	}
	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
zheng yan zheng yan 103 65.61% 5 38.46%
chris mason chris mason 24 15.29% 2 15.38%
josef bacik josef bacik 19 12.10% 2 15.38%
jeff mahoney jeff mahoney 5 3.18% 2 15.38%
arne jansen arne jansen 4 2.55% 1 7.69%
qu wenruo qu wenruo 2 1.27% 1 7.69%
Total 157 100.00% 13 100.00%

/*
 * when we wait for progress in the block group caching, its because
 * our allocation attempt failed at least once.  So, we must sleep
 * and let some progress happen before we try again.
 *
 * This function will sleep at least once waiting for new free space to
 * show up, and then it will check the block group free space numbers
 * for our min num_bytes.  Another option is to have it go ahead
 * and look in the rbtree for a free extent of a given size, but this
 * is a good start.
 *
 * Callers of this must check if cache->cached == BTRFS_CACHE_ERROR before using
 * any of the information in this block group.
 */

static noinline void

wait_block_group_cache_progress(struct btrfs_block_group_cache *cache,
				u64 num_bytes)
{
	struct btrfs_caching_control *caching_ctl;

	caching_ctl = get_caching_control(cache);
	if (!caching_ctl)
		return;

	wait_event(caching_ctl->wait, block_group_cache_done(cache) ||
		   (cache->free_space_ctl->free_space >= num_bytes));

	put_caching_control(caching_ctl);
}

Contributors
Person Tokens Prop Commits CommitProp
josef bacik josef bacik 41 68.33% 2 50.00%
zheng yan zheng yan 17 28.33% 1 25.00%
li zefan li zefan 2 3.33% 1 25.00%
Total 60 100.00% 4 100.00%


static noinline int

wait_block_group_cache_done(struct btrfs_block_group_cache *cache)
{
	struct btrfs_caching_control *caching_ctl;
	int ret = 0;

	caching_ctl = get_caching_control(cache);
	if (!caching_ctl)
		return (cache->cached == BTRFS_CACHE_ERROR) ? -EIO : 0;

	wait_event(caching_ctl->wait, block_group_cache_done(cache));
	if (cache->cached == BTRFS_CACHE_ERROR)
		ret = -EIO;
	put_caching_control(caching_ctl);
	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
josef bacik josef bacik 55 67.90% 2 66.67%
zheng yan zheng yan 26 32.10% 1 33.33%
Total 81 100.00% 3 100.00%



int __get_raid_index(u64 flags)
{
	if (flags & BTRFS_BLOCK_GROUP_RAID10)
		return BTRFS_RAID_RAID10;
	else if (flags & BTRFS_BLOCK_GROUP_RAID1)
		return BTRFS_RAID_RAID1;
	else if (flags & BTRFS_BLOCK_GROUP_DUP)
		return BTRFS_RAID_DUP;
	else if (flags & BTRFS_BLOCK_GROUP_RAID0)
		return BTRFS_RAID_RAID0;
	else if (flags & BTRFS_BLOCK_GROUP_RAID5)
		return BTRFS_RAID_RAID5;
	else if (flags & BTRFS_BLOCK_GROUP_RAID6)
		return BTRFS_RAID_RAID6;

	return BTRFS_RAID_SINGLE; /* BTRFS_BLOCK_GROUP_SINGLE */
}

Contributors
Person Tokens Prop Commits CommitProp
zheng yan zheng yan 36 50.70% 1 16.67%
david woodhouse david woodhouse 14 19.72% 1 16.67%
miao xie miao xie 12 16.90% 1 16.67%
chris mason chris mason 6 8.45% 1 16.67%
ilya dryomov ilya dryomov 2 2.82% 1 16.67%
liu bo liu bo 1 1.41% 1 16.67%
Total 71 100.00% 6 100.00%



int get_block_group_index(struct btrfs_block_group_cache *cache)
{
	return __get_raid_index(cache->flags);
}

Contributors
Person Tokens Prop Commits CommitProp
ilya dryomov ilya dryomov 17 94.44% 1 50.00%
liu bo liu bo 1 5.56% 1 50.00%
Total 18 100.00% 2 100.00%


static const char *btrfs_raid_type_names[BTRFS_NR_RAID_TYPES] = {
	[BTRFS_RAID_RAID10]	= "raid10",
	[BTRFS_RAID_RAID1]	= "raid1",
	[BTRFS_RAID_DUP]	= "dup",
	[BTRFS_RAID_RAID0]	= "raid0",
	[BTRFS_RAID_SINGLE]	= "single",
	[BTRFS_RAID_RAID5]	= "raid5",
	[BTRFS_RAID_RAID6]	= "raid6",
};



static const char *get_raid_name(enum btrfs_raid_types type)
{
	if (type >= BTRFS_NR_RAID_TYPES)
		return NULL;

	return btrfs_raid_type_names[type];
}

Contributors
Person Tokens Prop Commits CommitProp
jeff mahoney jeff mahoney 27 100.00% 2 100.00%
Total 27 100.00% 2 100.00%


enum btrfs_loop_type {
	
LOOP_CACHING_NOWAIT = 0,
	
LOOP_CACHING_WAIT = 1,
	
LOOP_ALLOC_CHUNK = 2,
	
LOOP_NO_EMPTY_SIZE = 3,
};


static inline void

btrfs_lock_block_group(struct btrfs_block_group_cache *cache,
		       int delalloc)
{
	if (delalloc)
		down_read(&cache->data_rwsem);
}

Contributors
Person Tokens Prop Commits CommitProp
miao xie miao xie 27 100.00% 1 100.00%
Total 27 100.00% 1 100.00%


static inline void

btrfs_grab_block_group(struct btrfs_block_group_cache *cache,
		       int delalloc)
{
	btrfs_get_block_group(cache);
	if (delalloc)
		down_read(&cache->data_rwsem);
}

Contributors
Person Tokens Prop Commits CommitProp
miao xie miao xie 32 100.00% 1 100.00%
Total 32 100.00% 1 100.00%


static struct btrfs_block_group_cache *

btrfs_lock_cluster(struct btrfs_block_group_cache *block_group,
		   struct btrfs_free_cluster *cluster,
		   int delalloc)
{
	struct btrfs_block_group_cache *used_bg = NULL;

	spin_lock(&cluster->refill_lock);
	while (1) {
		used_bg = cluster->block_group;
		if (!used_bg)
			return NULL;

		if (used_bg == block_group)
			return used_bg;

		btrfs_get_block_group(used_bg);

		if (!delalloc)
			return used_bg;

		if (down_read_trylock(&used_bg->data_rwsem))
			return used_bg;

		spin_unlock(&cluster->refill_lock);

		/* We should only have one-level nested. */
		down_read_nested(&used_bg->data_rwsem, SINGLE_DEPTH_NESTING);

		spin_lock(&cluster->refill_lock);
		if (used_bg == cluster->block_group)
			return used_bg;

		up_read(&used_bg->data_rwsem);
		btrfs_put_block_group(used_bg);
	}
}

Contributors
Person Tokens Prop Commits CommitProp
miao xie miao xie 102 71.83% 1 25.00%
geert uytterhoeven geert uytterhoeven 34 23.94% 1 25.00%
liu bo liu bo 4 2.82% 1 25.00%
sudip mukherjee sudip mukherjee 2 1.41% 1 25.00%
Total 142 100.00% 4 100.00%


static inline void

btrfs_release_block_group(struct btrfs_block_group_cache *cache,
			 int delalloc)
{
	if (delalloc)
		up_read(&cache->data_rwsem);
	btrfs_put_block_group(cache);
}

Contributors
Person Tokens Prop Commits CommitProp
miao xie miao xie 32 100.00% 1 100.00%
Total 32 100.00% 1 100.00%

/*
 * walks the btree of allocated extents and find a hole of a given size.
 * The key ins is changed to record the hole:
 * ins->objectid == start position
 * ins->flags = BTRFS_EXTENT_ITEM_KEY
 * ins->offset == the size of the hole.
 * Any available blocks before search_start are skipped.
 *
 * If there is no suitable free space, we will record the max size of
 * the free space extent currently.
 */


static noinline int find_free_extent(struct btrfs_root *orig_root,
				u64 ram_bytes, u64 num_bytes, u64 empty_size,
				u64 hint_byte, struct btrfs_key *ins,
				u64 flags, int delalloc)
{
	struct btrfs_fs_info *fs_info = orig_root->fs_info;
	int ret = 0;
	struct btrfs_root *root = fs_info->extent_root;
	struct btrfs_free_cluster *last_ptr = NULL;
	struct btrfs_block_group_cache *block_group = NULL;
	u64 search_start = 0;
	u64 max_extent_size = 0;
	u64 empty_cluster = 0;
	struct btrfs_space_info *space_info;
	int loop = 0;
	int index = __get_raid_index(flags);
	bool failed_cluster_refill = false;
	bool failed_alloc = false;
	bool use_cluster = true;
	bool have_caching_bg = false;
	bool orig_have_caching_bg = false;
	bool full_search = false;

	WARN_ON(num_bytes < fs_info->sectorsize);
	ins->type = BTRFS_EXTENT_ITEM_KEY;
	ins->objectid = 0;
	ins->offset = 0;

	trace_find_free_extent(fs_info, num_bytes, empty_size, flags);

	space_info = __find_space_info(fs_info, flags);
	if (!space_info) {
		btrfs_err(fs_info, "No space info for %llu", flags);
		return -ENOSPC;
	}

	/*
         * If our free space is heavily fragmented we may not be able to make
         * big contiguous allocations, so instead of doing the expensive search
         * for free space, simply return ENOSPC with our max_extent_size so we
         * can go ahead and search for a more manageable chunk.
         *
         * If our max_extent_size is large enough for our allocation simply
         * disable clustering since we will likely not be able to find enough
         * space to create a cluster and induce latency trying.
         */
	if (unlikely(space_info->max_extent_size)) {
		spin_lock(&space_info->lock);
		if (space_info->max_extent_size &&
		    num_bytes > space_info->max_extent_size) {
			ins->offset = space_info->max_extent_size;
			spin_unlock(&space_info->lock);
			return -ENOSPC;
		} else if (space_info->max_extent_size) {
			use_cluster = false;
		}
		spin_unlock(&space_info->lock);
	}

	last_ptr = fetch_cluster_info(fs_info, space_info, &empty_cluster);
	if (last_ptr) {
		spin_lock(&last_ptr->lock);
		if (last_ptr->block_group)
			hint_byte = last_ptr->window_start;
		if (last_ptr->fragmented) {
			/*
                         * We still set window_start so we can keep track of the
                         * last place we found an allocation to try and save
                         * some time.
                         */
			hint_byte = last_ptr->window_start;
			use_cluster = false;
		}
		spin_unlock(&last_ptr->lock);
	}

	search_start = max(search_start, first_logical_byte(fs_info, 0));
	search_start = max(search_start, hint_byte);
	if (search_start == hint_byte) {
		block_group = btrfs_lookup_block_group(fs_info, search_start);
		/*
                 * we don't want to use the block group if it doesn't match our
                 * allocation bits, or if its not cached.
                 *
                 * However if we are re-searching with an ideal block group
                 * picked out then we don't care that the block group is cached.
                 */
		if (block_group && block_group_bits(block_group, flags) &&
		    block_group->cached != BTRFS_CACHE_NO) {
			down_read(&space_info->groups_sem);
			if (list_empty(&block_group->list) ||
			    block_group->ro) {
				/*
                                 * someone is removing this block group,
                                 * we can't jump into the have_block_group
                                 * target because our list pointers are not
                                 * valid
                                 */
				btrfs_put_block_group(block_group);
				up_read(&space_info->groups_sem);
			} else {
				index = get_block_group_index(block_group);
				btrfs_lock_block_group(block_group, delalloc);
				goto have_block_group;
			}
		} else if (block_group) {
			btrfs_put_block_group(block_group);
		}
	}
search:
	have_caching_bg = false;
	if (index == 0 || index == __get_raid_index(flags))
		full_search = true;
	down_read(&space_info->groups_sem);
	list_for_each_entry(block_group, &space_info->block_groups[index],
			    list) {
		u64 offset;
		int cached;

		btrfs_grab_block_group(block_group, delalloc);
		search_start = block_group->key.objectid;

		/*
                 * this can happen if we end up cycling through all the
                 * raid types, but we want to make sure we only allocate
                 * for the proper type.
                 */
		if (!block_group_bits(block_group, flags)) {
		    u64 extra = BTRFS_BLOCK_GROUP_DUP |
				BTRFS_BLOCK_GROUP_RAID1 |
				BTRFS_BLOCK_GROUP_RAID5 |
				BTRFS_BLOCK_GROUP_RAID6 |
				BTRFS_BLOCK_GROUP_RAID10;

			/*
                         * if they asked for extra copies and this block group
                         * doesn't provide them, bail.  This does allow us to
                         * fill raid0 from raid1.
                         */
			if ((flags & extra) && !(block_group->flags & extra))
				goto loop;
		}

have_block_group:
		cached = block_group_cache_done(block_group);
		if (unlikely(!cached)) {
			have_caching_bg = true;
			ret = cache_block_group(block_group, 0);
			BUG_ON(ret < 0);
			ret = 0;
		}

		if (unlikely(block_group->cached == BTRFS_CACHE_ERROR))
			goto loop;
		if (unlikely(block_group->ro))
			goto loop;

		/*
                 * Ok we want to try and use the cluster allocator, so
                 * lets look there
                 */
		if (last_ptr && use_cluster) {
			struct btrfs_block_group_cache *used_block_group;
			unsigned long aligned_cluster;
			/*
                         * the refill lock keeps out other
                         * people trying to start a new cluster
                         */
			used_block_group = btrfs_lock_cluster(block_group,
							      last_ptr,
							      delalloc);
			if (!used_block_group)
				goto refill_cluster;

			if (used_block_group != block_group &&
			    (used_block_group->ro ||
			     !block_group_bits(used_block_group, flags)))
				goto release_cluster;

			offset = btrfs_alloc_from_cluster(used_block_group,
						last_ptr,
						num_bytes,
						used_block_group->key.objectid,
						&max_extent_size);
			if (offset) {
				/* we have a block, we're done */
				spin_unlock(&last_ptr->refill_lock);
				trace_btrfs_reserve_extent_cluster(fs_info,
						used_block_group,
						search_start, num_bytes);
				if (used_block_group != block_group) {
					btrfs_release_block_group(block_group,
								  delalloc);
					block_group = used_block_group;
				}
				goto checks;
			}

			WARN_ON(last_ptr->block_group != used_block_group);
release_cluster:
			/* If we are on LOOP_NO_EMPTY_SIZE, we can't
                         * set up a new clusters, so lets just skip it
                         * and let the allocator find whatever block
                         * it can find.  If we reach this point, we
                         * will have tried the cluster allocator
                         * plenty of times and not have found
                         * anything, so we are likely way too
                         * fragmented for the clustering stuff to find
                         * anything.
                         *
                         * However, if the cluster is taken from the
                         * current block group, release the cluster
                         * first, so that we stand a better chance of
                         * succeeding in the unclustered
                         * allocation.  */
			if (loop >= LOOP_NO_EMPTY_SIZE &&
			    used_block_group != block_group) {
				spin_unlock(&last_ptr->refill_lock);
				btrfs_release_block_group(used_block_group,
							  delalloc);
				goto unclustered_alloc;
			}

			/*
                         * this cluster didn't work out, free it and
                         * start over
                         */
			btrfs_return_cluster_to_free_space(NULL, last_ptr);

			if (used_block_group != block_group)
				btrfs_release_block_group(used_block_group,
							  delalloc);
refill_cluster:
			if (loop >= LOOP_NO_EMPTY_SIZE) {
				spin_unlock(&last_ptr->refill_lock);
				goto unclustered_alloc;
			}

			aligned_cluster = max_t(unsigned long,
						empty_cluster + empty_size,
					      block_group->full_stripe_len);

			/* allocate a cluster in this block group */
			ret = btrfs_find_space_cluster(fs_info, block_group,
						       last_ptr, search_start,
						       num_bytes,
						       aligned_cluster);
			if (ret == 0) {
				/*
                                 * now pull our allocation out of this
                                 * cluster
                                 */
				offset = btrfs_alloc_from_cluster(block_group,
							last_ptr,
							num_bytes,
							search_start,
							&max_extent_size);
				if (offset) {
					/* we found one, proceed */
					spin_unlock(&last_ptr->refill_lock);
					trace_btrfs_reserve_extent_cluster(fs_info,
						block_group, search_start,
						num_bytes);
					goto checks;
				}
			} else if (!cached && loop > LOOP_CACHING_NOWAIT
				   && !failed_cluster_refill) {
				spin_unlock(&last_ptr->refill_lock);

				failed_cluster_refill = true;
				wait_block_group_cache_progress(block_group,
				       num_bytes + empty_cluster + empty_size);
				goto have_block_group;
			}

			/*
                         * at this point we either didn't find a cluster
                         * or we weren't able to allocate a block from our
                         * cluster.  Free the cluster we've been trying
                         * to use, and go to the next block group
                         */
			btrfs_return_cluster_to_free_space(NULL, last_ptr);
			spin_unlock(&last_ptr->refill_lock);
			goto loop;
		}

unclustered_alloc:
		/*
                 * We are doing an unclustered alloc, set the fragmented flag so
                 * we don't bother trying to setup a cluster again until we get
                 * more space.
                 */
		if (unlikely(last_ptr)) {
			spin_lock(&last_ptr->lock);
			last_ptr->fragmented = 1;
			spin_unlock(&last_ptr->lock);
		}
		spin_lock(&block_group->free_space_ctl->tree_lock);
		if (cached &&
		    block_group->free_space_ctl->free_space <
		    num_bytes + empty_cluster + empty_size) {
			if (block_group->free_space_ctl->free_space >
			    max_extent_size)
				max_extent_size =
					block_group->free_space_ctl->free_space;
			spin_unlock(&block_group->free_space_ctl->tree_lock);
			goto loop;
		}
		spin_unlock(&block_group->free_space_ctl->tree_lock);

		offset = btrfs_find_space_for_alloc(block_group, search_start,
						    num_bytes, empty_size,
						    &max_extent_size);
		/*
                 * If we didn't find a chunk, and we haven't failed on this
                 * block group before, and this block group is in the middle of
                 * caching and we are ok with waiting, then go ahead and wait
                 * for progress to be made, and set failed_alloc to true.
                 *
                 * If failed_alloc is true then we've already waited on this
                 * block group once and should move on to the next block group.
                 */
		if (!offset && !failed_alloc && !cached &&
		    loop > LOOP_CACHING_NOWAIT) {
			wait_block_group_cache_progress(block_group,
						num_bytes + empty_size);
			failed_alloc = true;
			goto have_block_group;
		} else if (!offset) {
			goto loop;
		}
checks:
		search_start = ALIGN(offset, fs_info->stripesize);

		/* move on to the next group */
		if (search_start + num_bytes >
		    block_group->key.objectid + block_group->key.offset) {
			btrfs_add_free_space(block_group, offset, num_bytes);
			goto loop;
		}

		if (offset < search_start)
			btrfs_add_free_space(block_group, offset,
					     search_start - offset);
		BUG_ON(offset > search_start);

		ret = btrfs_add_reserved_bytes(block_group, ram_bytes,
				num_bytes, delalloc);
		if (ret == -EAGAIN) {
			btrfs_add_free_space(block_group, offset, num_bytes);
			goto loop;
		}
		btrfs_inc_block_group_reservations(block_group);

		/* we are all good, lets return */
		ins->objectid = search_start;
		ins->offset = num_bytes;

		trace_btrfs_reserve_extent(fs_info, block_group,
					   search_start, num_bytes);
		btrfs_release_block_group(block_group, delalloc);
		break;
loop:
		failed_cluster_refill = false;
		failed_alloc = false;
		BUG_ON(index != get_block_group_index(block_group));
		btrfs_release_block_group(block_group, delalloc);
	}
	up_read(&space_info->groups_sem);

	if ((loop == LOOP_CACHING_NOWAIT) && have_caching_bg
		&& !orig_have_caching_bg)
		orig_have_caching_bg = true;

	if (!ins->objectid && loop >= LOOP_CACHING_WAIT && have_caching_bg)
		goto search;

	if (!ins->objectid && ++index < BTRFS_NR_RAID_TYPES)
		goto search;

	/*
         * LOOP_CACHING_NOWAIT, search partially cached block groups, kicking
         *                      caching kthreads as we move along
         * LOOP_CACHING_WAIT, search everything, and wait if our bg is caching
         * LOOP_ALLOC_CHUNK, force a chunk allocation and try again
         * LOOP_NO_EMPTY_SIZE, set empty_size and empty_cluster to 0 and try
         *                      again
         */
	if (!ins->objectid && loop < LOOP_NO_EMPTY_SIZE) {
		index = 0;
		if (loop == LOOP_CACHING_NOWAIT) {
			/*
                         * We want to skip the LOOP_CACHING_WAIT step if we
                         * don't have any uncached bgs and we've already done a
                         * full search through.
                         */
			if (orig_have_caching_bg || !full_search)
				loop = LOOP_CACHING_WAIT;
			else
				loop = LOOP_ALLOC_CHUNK;
		} else {
			loop++;
		}

		if (loop == LOOP_ALLOC_CHUNK) {
			struct btrfs_trans_handle *trans;
			int exist = 0;

			trans = current->journal_info;
			if (trans)
				exist = 1;
			else
				trans = btrfs_join_transaction(root);

			if (IS_ERR(trans)) {
				ret = PTR_ERR(trans);
				goto out;
			}

			ret = do_chunk_alloc(trans, fs_info, flags,
					     CHUNK_ALLOC_FORCE);

			/*
                         * If we can't allocate a new chunk we've already looped
                         * through at least once, move on to the NO_EMPTY_SIZE
                         * case.
                         */
			if (ret == -ENOSPC)
				loop = LOOP_NO_EMPTY_SIZE;

			/*
                         * Do not bail out on ENOSPC since we
                         * can do more things.
                         */
			if (ret < 0 && ret != -ENOSPC)
				btrfs_abort_transaction(trans, ret);
			else
				ret = 0;
			if (!exist)
				btrfs_end_transaction(trans);
			if (ret)
				goto out;
		}

		if (loop == LOOP_NO_EMPTY_SIZE) {
			/*
                         * Don't loop again if we already have no empty_size and
                         * no empty_cluster.
                         */
			if (empty_size == 0 &&
			    empty_cluster == 0) {
				ret = -ENOSPC;
				goto out;
			}
			empty_size = 0;
			empty_cluster = 0;
		}

		goto search;
	} else if (!ins->objectid) {
		ret = -ENOSPC;
	} else if (ins->objectid) {
		if (!use_cluster && last_ptr) {
			spin_lock(&last_ptr->lock);
			last_ptr->window_start = ins->objectid;
			spin_unlock(&last_ptr->lock);
		}
		ret = 0;
	}
out:
	if (ret == -ENOSPC) {
		spin_lock(&space_info->lock);
		space_info->max_extent_size = max_extent_size;
		spin_unlock(&space_info->lock);
		ins->offset = max_extent_size;
	}
	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
zheng yan zheng yan 677 39.57% 7 11.86%
josef bacik josef bacik 555 32.44% 20 33.90%
miao xie miao xie 161 9.41% 5 8.47%
alexandre oliva alexandre oliva 107 6.25% 4 6.78%
chris mason chris mason 76 4.44% 4 6.78%
jeff mahoney jeff mahoney 42 2.45% 5 8.47%
wang shilong wang shilong 25 1.46% 1 1.69%
chandan rajendra chandan rajendra 23 1.34% 1 1.69%
david sterba david sterba 15 0.88% 3 5.08%
liu bo liu bo 8 0.47% 2 3.39%
wang xiaoguang wang xiaoguang 6 0.35% 2 3.39%
david woodhouse david woodhouse 5 0.29% 1 1.69%
filipe david borba manana filipe david borba manana 5 0.29% 1 1.69%
simon kirby simon kirby 4 0.23% 1 1.69%
ilya dryomov ilya dryomov 1 0.06% 1 1.69%
nicholas d steeves nicholas d steeves 1 0.06% 1 1.69%
Total 1711 100.00% 59 100.00%



static void dump_space_info(struct btrfs_fs_info *fs_info,
			    struct btrfs_space_info *info, u64 bytes,
			    int dump_block_groups)
{
	struct btrfs_block_group_cache *cache;
	int index = 0;

	spin_lock(&info->lock);
	btrfs_info(fs_info, "space_info %llu has %llu free, is %sfull",
		   info->flags,
		   info->total_bytes - info->bytes_used - info->bytes_pinned -
		   info->bytes_reserved - info->bytes_readonly -
		   info->bytes_may_use, (info->full) ? "" : "not ");
	btrfs_info(fs_info,
		"space_info total=%llu, used=%llu, pinned=%llu, reserved=%llu, may_use=%llu, readonly=%llu",
		info->total_bytes, info->bytes_used, info->bytes_pinned,
		info->bytes_reserved, info->bytes_may_use,
		info->bytes_readonly);
	spin_unlock(&info->lock);

	if (!dump_block_groups)
		return;

	down_read(&info->groups_sem);
again:
	list_for_each_entry(cache, &info->block_groups[index], list) {
		spin_lock(&cache->lock);
		btrfs_info(fs_info,
			"block group %llu has %llu bytes, %llu used %llu pinned %llu reserved %s",
			cache->key.objectid, cache->key.offset,
			btrfs_block_group_used(&cache->item), cache->pinned,
			cache->reserved, cache->ro ? "[readonly]" : "");
		btrfs_dump_free_space(cache, bytes);
		spin_unlock(&cache->lock);
	}
	if (++index < BTRFS_NR_RAID_TYPES)
		goto again;
	up_read(&info->groups_sem);
}

Contributors
Person Tokens Prop Commits CommitProp
zheng yan zheng yan 187 79.91% 7 58.33%
josef bacik josef bacik 18 7.69% 2 16.67%
jeff mahoney jeff mahoney 17 7.26% 1 8.33%
liu bo liu bo 8 3.42% 1 8.33%
wang xiaoguang wang xiaoguang 4 1.71% 1 8.33%
Total 234 100.00% 12 100.00%



int btrfs_reserve_extent(struct btrfs_root *root, u64 ram_bytes,
			 u64 num_bytes, u64 min_alloc_size,
			 u64 empty_size, u64 hint_byte,
			 struct btrfs_key *ins, int is_data, int delalloc)
{
	struct btrfs_fs_info *fs_info = root->fs_info;
	bool final_tried = num_bytes == min_alloc_size;
	u64 flags;
	int ret;

	flags = btrfs_get_alloc_profile(root, is_data);
again:
	WARN_ON(num_bytes < fs_info->sectorsize);
	ret = find_free_extent(root, ram_bytes, num_bytes, empty_size,
			       hint_byte, ins, flags, delalloc);
	if (!ret && !is_data) {
		btrfs_dec_block_group_reservations(fs_info, ins->objectid);
	} else if (ret == -ENOSPC) {
		if (!final_tried && ins->offset) {
			num_bytes = min(num_bytes >> 1, ins->offset);
			num_bytes = round_down(num_bytes,
					       fs_info->sectorsize);
			num_bytes = max(num_bytes, min_alloc_size);
			ram_bytes = num_bytes;
			if (num_bytes == min_alloc_size)
				final_tried = true;
			goto again;
		} else if (btrfs_test_opt(fs_info, ENOSPC_DEBUG)) {
			struct btrfs_space_info *sinfo;

			sinfo = __find_space_info(fs_info, flags);
			btrfs_err(fs_info,
				  "allocation failed flags %llu, wanted %llu",
				  flags, num_bytes);
			if (sinfo)
				dump_space_info(fs_info, sinfo, num_bytes, 1);
		}
	}

	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
zheng yan zheng yan 110 45.08% 5 21.74%
miao xie miao xie 36 14.75% 3 13.04%
jeff mahoney jeff mahoney 22 9.02% 5 21.74%
filipe david borba manana filipe david borba manana 20 8.20% 1 4.35%
chris mason chris mason 17 6.97% 3 13.04%
josef bacik josef bacik 12 4.92% 2 8.70%
david sterba david sterba 10 4.10% 1 4.35%
wang xiaoguang wang xiaoguang 9 3.69% 1 4.35%
zach brown zach brown 4 1.64% 1 4.35%
simon kirby simon kirby 4 1.64% 1 4.35%
Total 244 100.00% 23 100.00%



static int __btrfs_free_reserved_extent(struct btrfs_fs_info *fs_info,
					u64 start, u64 len,
					int pin, int delalloc)
{
	struct btrfs_block_group_cache *cache;
	int ret = 0;

	cache = btrfs_lookup_block_group(fs_info, start);
	if (!cache) {
		btrfs_err(fs_info, "Unable to find block group for %llu",
			  start);
		return -ENOSPC;
	}

	if (pin)
		pin_down_extent(fs_info, cache, start, len, 1);
	else {
		if (btrfs_test_opt(fs_info, DISCARD))
			ret = btrfs_discard_extent(fs_info, start, len, NULL);
		btrfs_add_free_space(cache, start, len);
		btrfs_free_reserved_bytes(cache, len, delalloc);
		trace_btrfs_reserved_extent_free(fs_info, start, len);
	}

	btrfs_put_block_group(cache);
	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
zheng yan zheng yan 69 49.64% 4 25.00%
chris mason chris mason 21 15.11% 2 12.50%
filipe david borba manana filipe david borba manana 16 11.51% 1 6.25%
liu bo liu bo 8 5.76% 1 6.25%
josef bacik josef bacik 6 4.32% 1 6.25%
jeff mahoney jeff mahoney 6 4.32% 3 18.75%
miao xie miao xie 4 2.88% 1 6.25%
simon kirby simon kirby 4 2.88% 1 6.25%
li dongyang li dongyang 4 2.88% 1 6.25%
wang xiaoguang wang xiaoguang 1 0.72% 1 6.25%
Total 139 100.00% 16 100.00%



int btrfs_free_reserved_extent(struct btrfs_fs_info *fs_info,
			       u64 start, u64 len, int delalloc)
{
	return __btrfs_free_reserved_extent(fs_info, start, len, 0, delalloc);
}

Contributors
Person Tokens Prop Commits CommitProp
chris mason chris mason 25 75.76% 1 33.33%
miao xie miao xie 5 15.15% 1 33.33%
jeff mahoney jeff mahoney 3 9.09% 1 33.33%
Total 33 100.00% 3 100.00%



int btrfs_free_and_pin_reserved_extent(struct btrfs_fs_info *fs_info,
				       u64 start, u64 len)
{
	return __btrfs_free_reserved_extent(fs_info, start, len, 1, 0);
}

Contributors
Person Tokens Prop Commits CommitProp
chris mason chris mason 25 83.33% 1 33.33%
jeff mahoney jeff mahoney 3 10.00% 1 33.33%
miao xie miao xie 2 6.67% 1 33.33%
Total 30 100.00% 3 100.00%



static int alloc_reserved_file_extent(struct btrfs_trans_handle *trans,
				      struct btrfs_fs_info *fs_info,
				      u64 parent, u64 root_objectid,
				      u64 flags, u64 owner, u64 offset,
				      struct btrfs_key *ins, int ref_mod)
{
	int ret;
	struct btrfs_extent_item *extent_item;
	struct btrfs_extent_inline_ref *iref;
	struct btrfs_path *path;
	struct extent_buffer *leaf;
	int type;
	u32 size;

	if (parent > 0)
		type = BTRFS_SHARED_DATA_REF_KEY;
	else
		type = BTRFS_EXTENT_DATA_REF_KEY;

	size = sizeof(*extent_item) + btrfs_extent_inline_ref_size(type);

	path = btrfs_alloc_path();
	if (!path)
		return -ENOMEM;

	path->leave_spinning = 1;
	ret = btrfs_insert_empty_item(trans, fs_info->extent_root, path,
				      ins, size);
	if (ret) {
		btrfs_free_path(path);
		return ret;
	}

	leaf = path->nodes[0];
	extent_item = btrfs_item_ptr(leaf, path->slots[0],
				     struct btrfs_extent_item);
	btrfs_set_extent_refs(leaf, extent_item, ref_mod);
	btrfs_set_extent_generation(leaf, extent_item, trans->transid);
	btrfs_set_extent_flags(leaf, extent_item,
			       flags | BTRFS_EXTENT_FLAG_DATA);

	iref = (struct btrfs_extent_inline_ref *)(extent_item + 1);
	btrfs_set_extent_inline_ref_type(leaf, iref, type);
	if (parent > 0) {
		struct btrfs_shared_data_ref *ref;
		ref = (struct btrfs_shared_data_ref *)(iref + 1);
		btrfs_set_extent_inline_ref_offset(leaf, iref, parent);
		btrfs_set_shared_data_ref_count(leaf, ref, ref_mod);
	} else {
		struct btrfs_extent_data_ref *ref;
		ref = (struct btrfs_extent_data_ref *)(&iref->offset);
		btrfs_set_extent_data_ref_root(leaf, ref, root_objectid);
		btrfs_set_extent_data_ref_objectid(leaf, ref, owner);
		btrfs_set_extent_data_ref_offset(leaf, ref, offset);
		btrfs_set_extent_data_ref_count(leaf, ref, ref_mod);
	}

	btrfs_mark_buffer_dirty(path->nodes[0]);
	btrfs_free_path(path);

	ret = remove_from_free_space_tree(trans, fs_info, ins->objectid,
					  ins->offset);
	if (ret)
		return ret;

	ret = update_block_group(trans, fs_info, ins->objectid, ins->offset, 1);
	if (ret) { /* -ENOENT, logic error */
		btrfs_err(fs_info, "update block group failed for %llu %llu",
			ins->objectid, ins->offset);
		BUG();
	}
	trace_btrfs_reserved_extent_alloc(fs_info, ins->objectid, ins->offset);
	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
zheng yan zheng yan 345 80.80% 4 23.53%
omar sandoval omar sandoval 24 5.62% 1 5.88%
chris mason chris mason 17 3.98% 4 23.53%
jeff mahoney jeff mahoney 16 3.75% 4 23.53%
josef bacik josef bacik 14 3.28% 2 11.76%
tsutomu itoh tsutomu itoh 7 1.64% 1 5.88%
simon kirby simon kirby 4 0.94% 1 5.88%
Total 427 100.00% 17 100.00%



static int alloc_reserved_tree_block(struct btrfs_trans_handle *trans,
				     struct btrfs_fs_info *fs_info,
				     u64 parent, u64 root_objectid,
				     u64 flags, struct btrfs_disk_key *key,
				     int level, struct btrfs_key *ins)
{
	int ret;
	struct btrfs_extent_item *extent_item;
	struct btrfs_tree_block_info *block_info;
	struct btrfs_extent_inline_ref *iref;
	struct btrfs_path *path;
	struct extent_buffer *leaf;
	u32 size = sizeof(*extent_item) + sizeof(*iref);
	u64 num_bytes = ins->offset;
	bool skinny_metadata = btrfs_fs_incompat(fs_info, SKINNY_METADATA);

	if (!skinny_metadata)
		size += sizeof(*block_info);

	path = btrfs_alloc_path();
	if (!path) {
		btrfs_free_and_pin_reserved_extent(fs_info, ins->objectid,
						   fs_info->nodesize);
		return -ENOMEM;
	}

	path->leave_spinning = 1;
	ret = btrfs_insert_empty_item(trans, fs_info->extent_root, path,
				      ins, size);
	if (ret) {
		btrfs_free_path(path);
		btrfs_free_and_pin_reserved_extent(fs_info, ins->objectid,
						   fs_info->nodesize);
		return ret;
	}

	leaf = path->nodes[0];
	extent_item = btrfs_item_ptr(leaf, path->slots[0],
				     struct btrfs_extent_item);
	btrfs_set_extent_refs(leaf, extent_item, 1);
	btrfs_set_extent_generation(leaf, extent_item, trans->transid);
	btrfs_set_extent_flags(leaf, extent_item,
			       flags | BTRFS_EXTENT_FLAG_TREE_BLOCK);

	if (skinny_metadata) {
		iref = (struct btrfs_extent_inline_ref *)(extent_item + 1);
		num_bytes = fs_info->nodesize;
	} else {
		block_info = (struct btrfs_tree_block_info *)(extent_item + 1);
		btrfs_set_tree_block_key(leaf, block_info, key);
		btrfs_set_tree_block_level(leaf, block_info, level);
		iref = (struct btrfs_extent_inline_ref *)(block_info + 1);
	}

	if (parent > 0) {
		BUG_ON(!(flags & BTRFS_BLOCK_FLAG_FULL_BACKREF));
		btrfs_set_extent_inline_ref_type(leaf, iref,
						 BTRFS_SHARED_BLOCK_REF_KEY);
		btrfs_set_extent_inline_ref_offset(leaf, iref, parent);
	} else {
		btrfs_set_extent_inline_ref_type(leaf, iref,
						 BTRFS_TREE_BLOCK_REF_KEY);
		btrfs_set_extent_inline_ref_offset(leaf, iref, root_objectid);
	}

	btrfs_mark_buffer_dirty(leaf);
	btrfs_free_path(path);

	ret = remove_from_free_space_tree(trans, fs_info, ins->objectid,
					  num_bytes);
	if (ret)
		return ret;

	ret = update_block_group(trans, fs_info, ins->objectid,
				 fs_info->nodesize, 1);
	if (ret) { /* -ENOENT, logic error */
		btrfs_err(fs_info, "update block group failed for %llu %llu",
			ins->objectid, ins->offset);
		BUG();
	}

	trace_btrfs_reserved_extent_alloc(fs_info, ins->objectid,
					  fs_info->nodesize);
	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
zheng yan zheng yan 296 63.25% 5 20.83%
josef bacik josef bacik 86 18.38% 6 25.00%
jeff mahoney jeff mahoney 25 5.34% 5 20.83%
chris mason chris mason 23 4.91% 4 16.67%
omar sandoval omar sandoval 22 4.70% 1 4.17%
mark fasheh mark fasheh 7 1.50% 1 4.17%
david sterba david sterba 5 1.07% 1 4.17%
simon kirby simon kirby 4 0.85% 1 4.17%
Total 468 100.00% 24 100.00%



int btrfs_alloc_reserved_file_extent(struct btrfs_trans_handle *trans,
				     u64 root_objectid, u64 owner,
				     u64 offset, u64 ram_bytes,
				     struct btrfs_key *ins)
{
	struct btrfs_fs_info *fs_info = trans->fs_info;
	int ret;

	BUG_ON(root_objectid == BTRFS_TREE_LOG_OBJECTID);

	ret = btrfs_add_delayed_data_ref(fs_info, trans, ins->objectid,
					 ins->offset, 0,
					 root_objectid, owner, offset,
					 ram_bytes, BTRFS_ADD_DELAYED_EXTENT,
					 NULL);
	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
zheng yan zheng yan 61 76.25% 3 33.33%
jeff mahoney jeff mahoney 9 11.25% 2 22.22%
qu wenruo qu wenruo 5 6.25% 1 11.11%
chris mason chris mason 3 3.75% 2 22.22%
arne jansen arne jansen 2 2.50% 1 11.11%
Total 80 100.00% 9 100.00%

/*
 * this is used by the tree logging recovery code.  It records that
 * an extent has been allocated and makes sure to clear the free
 * space cache bits as well
 */


int btrfs_alloc_logged_file_extent(struct btrfs_trans_handle *trans,
				   struct btrfs_fs_info *fs_info,
				   u64 root_objectid, u64 owner, u64 offset,
				   struct btrfs_key *ins)
{
	int ret;
	struct btrfs_block_group_cache *block_group;
	struct btrfs_space_info *space_info;

	/*
         * Mixed block groups will exclude before processing the log so we only
         * need to do the exclude dance if this fs isn't mixed.
         */
	if (!btrfs_fs_incompat(fs_info, MIXED_GROUPS)) {
		ret = __exclude_logged_extent(fs_info, ins->objectid,
					      ins->offset);
		if (ret)
			return ret;
	}

	block_group = btrfs_lookup_block_group(fs_info, ins->objectid);
	if (!block_group)
		return -EINVAL;

	space_info = block_group->space_info;
	spin_lock(&space_info->lock);
	spin_lock(&block_group->lock);
	space_info->bytes_reserved += ins->offset;
	block_group->reserved += ins->offset;
	spin_unlock(&block_group->lock);
	spin_unlock(&space_info->lock);

	ret = alloc_reserved_file_extent(trans, fs_info, 0, root_objectid,
					 0, owner, offset, ins, 1);
	btrfs_put_block_group(block_group);
	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
zheng yan zheng yan 93 51.10% 5 41.67%
wang xiaoguang wang xiaoguang 48 26.37% 2 16.67%
josef bacik josef bacik 36 19.78% 3 25.00%
jeff mahoney jeff mahoney 4 2.20% 1 8.33%
nicholas d steeves nicholas d steeves 1 0.55% 1 8.33%
Total 182 100.00% 12 100.00%


static struct extent_buffer *

btrfs_init_new_buffer(struct btrfs_trans_handle *trans, struct btrfs_root *root,
		      u64 bytenr, int level)
{
	struct btrfs_fs_info *fs_info = root->fs_info;
	struct extent_buffer *buf;

	buf = btrfs_find_create_tree_block(fs_info, bytenr);
	if (IS_ERR(buf))
		return buf;

	btrfs_set_header_generation(buf, trans->transid);
	btrfs_set_buffer_lockdep_class(root->root_key.objectid, buf, level);
	btrfs_tree_lock(buf);
	clean_tree_block(trans, fs_info, buf);
	clear_bit(EXTENT_BUFFER_STALE, &buf->bflags);

	btrfs_set_lock_blocking(buf);
	set_extent_buffer_uptodate(buf);

	if (root->root_key.objectid == BTRFS_TREE_LOG_OBJECTID) {
		buf->log_index = root->log_transid % 2;
		/*
                 * we allow two log transactions at a time, use different
                 * EXENT bit to differentiate dirty pages.
                 */
		if (buf->log_index == 0)
			set_extent_dirty(&root->dirty_log_pages, buf->start,
					buf->start + buf->len - 1, GFP_NOFS);
		else
			set_extent_new(&root->dirty_log_pages, buf->start,
					buf->start + buf->len - 1);
	} else {
		buf->log_index = -1;
		set_extent_dirty(&trans->transaction->dirty_pages, buf->start,
			 buf->start + buf->len - 1, GFP_NOFS);
	}
	trans->dirty = true;
	/* this returns a buffer locked for blocking */
	return buf;
}

Contributors
Person Tokens Prop Commits CommitProp
zheng yan zheng yan 171 72.15% 4 22.22%
filipe david borba manana filipe david borba manana 18 7.59% 1 5.56%
chris mason chris mason 15 6.33% 4 22.22%
josef bacik josef bacik 13 5.49% 2 11.11%
jeff mahoney jeff mahoney 13 5.49% 3 16.67%
liu bo liu bo 4 1.69% 1 5.56%
eric sandeen eric sandeen 1 0.42% 1 5.56%
daniel dressler daniel dressler 1 0.42% 1 5.56%
david sterba david sterba 1 0.42% 1 5.56%
Total 237 100.00% 18 100.00%


static struct btrfs_block_rsv *

use_block_rsv(struct btrfs_trans_handle *trans,
	      struct btrfs_root *root, u32 blocksize)
{
	struct btrfs_fs_info *fs_info = root->fs_info;
	struct btrfs_block_rsv *block_rsv;
	struct btrfs_block_rsv *global_rsv = &fs_info->global_block_rsv;
	int ret;
	bool global_updated = false;

	block_rsv = get_block_rsv(trans, root);

	if (unlikely(block_rsv->size == 0))
		goto try_reserve;
again:
	ret = block_rsv_use_bytes(block_rsv, blocksize);
	if (!ret)
		return block_rsv;

	if (block_rsv->failfast)
		return ERR_PTR(ret);

	if (block_rsv->type == BTRFS_BLOCK_RSV_GLOBAL && !global_updated) {
		global_updated = true;
		update_global_block_rsv(fs_info);
		goto again;
	}

	if (btrfs_test_opt(fs_info, ENOSPC_DEBUG)) {
		static DEFINE_RATELIMIT_STATE(_rs,
				DEFAULT_RATELIMIT_INTERVAL * 10,
				/*DEFAULT_RATELIMIT_BURST*/ 1);
		if (__ratelimit(&_rs))
			WARN(1, KERN_DEBUG
				"BTRFS: block rsv returned %d\n", ret);
	}
try_reserve:
	ret = reserve_metadata_bytes(root, block_rsv, blocksize,
				     BTRFS_RESERVE_NO_FLUSH);
	if (!ret)
		return block_rsv;
	/*
         * If we couldn't reserve metadata bytes try and use some from
         * the global reserve if its space type is the same as the global
         * reservation.
         */
	if (block_rsv->type != BTRFS_BLOCK_RSV_GLOBAL &&
	    block_rsv->space_info == global_rsv->space_info) {
		ret = block_rsv_use_bytes(global_rsv, blocksize);
		if (!ret)
			return global_rsv;
	}
	return ERR_PTR(ret);
}

Contributors
Person Tokens Prop Commits CommitProp
josef bacik josef bacik 73 30.54% 1 7.69%
miao xie miao xie 58 24.27% 4 30.77%
zheng yan zheng yan 57 23.85% 2 15.38%
david sterba david sterba 37 15.48% 2 15.38%
jeff mahoney jeff mahoney 10 4.18% 2 15.38%
julia lawall julia lawall 3 1.26% 1 7.69%
frank holton frank holton 1 0.42% 1 7.69%
Total 239 100.00% 13 100.00%



static void unuse_block_rsv(struct btrfs_fs_info *fs_info,
			    struct btrfs_block_rsv *block_rsv, u32 blocksize)
{
	block_rsv_add_bytes(block_rsv, blocksize, 0);
	block_rsv_release_bytes(fs_info, block_rsv, NULL, 0);
}

Contributors
Person Tokens Prop Commits CommitProp
zheng yan zheng yan 27 69.23% 3 60.00%
josef bacik josef bacik 7 17.95% 1 20.00%
yan zheng yan zheng 5 12.82% 1 20.00%
Total 39 100.00% 5 100.00%

/*
 * finds a free extent and does all the dirty work required for allocation
 * returns the tree buffer or an ERR_PTR on error.
 */


struct extent_buffer *btrfs_alloc_tree_block(struct btrfs_trans_handle *trans,
					struct btrfs_root *root,
					u64 parent, u64 root_objectid,
					struct btrfs_disk_key *key, int level,
					u64 hint, u64 empty_size)
{
	struct btrfs_fs_info *fs_info = root->fs_info;
	struct btrfs_key ins;
	struct btrfs_block_rsv *block_rsv;
	struct extent_buffer *buf;
	struct btrfs_delayed_extent_op *extent_op;
	u64 flags = 0;
	int ret;
	u32 blocksize = fs_info->nodesize;
	bool skinny_metadata = btrfs_fs_incompat(fs_info, SKINNY_METADATA);

#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
	if (btrfs_is_testing(fs_info)) {
		buf = btrfs_init_new_buffer(trans, root, root->alloc_bytenr,
					    level);
		if (!IS_ERR(buf))
			root->alloc_bytenr += blocksize;
		return buf;
	}
#endif

	block_rsv = use_block_rsv(trans, root, blocksize);
	if (IS_ERR(block_rsv))
		return ERR_CAST(block_rsv);

	ret = btrfs_reserve_extent(root, blocksize, blocksize, blocksize,
				   empty_size, hint, &ins, 0, 0);
	if (ret)
		goto out_unuse;

	buf = btrfs_init_new_buffer(trans, root, ins.objectid, level);
	if (IS_ERR(buf)) {
		ret = PTR_ERR(buf);
		goto out_free_reserved;
	}

	if (root_objectid == BTRFS_TREE_RELOC_OBJECTID) {
		if (parent == 0)
			parent = ins.objectid;
		flags |= BTRFS_BLOCK_FLAG_FULL_BACKREF;
	} else
		BUG_ON(parent > 0);

	if (root_objectid != BTRFS_TREE_LOG_OBJECTID) {
		extent_op = btrfs_alloc_delayed_extent_op();
		if (!extent_op) {
			ret = -ENOMEM;
			goto out_free_buf;
		}
		if (key)
			memcpy(&extent_op->key, key, sizeof(extent_op->key));
		else
			memset(&extent_op->key, 0, sizeof(extent_op->key));
		extent_op->flags_to_set = flags;
		extent_op->update_key = skinny_metadata ? false : true;
		extent_op->update_flags = true;
		extent_op->is_data = false;
		extent_op->level = level;

		ret = btrfs_add_delayed_tree_ref(fs_info, trans,
						 ins.objectid, ins.offset,
						 parent, root_objectid, level,
						 BTRFS_ADD_DELAYED_EXTENT,
						 extent_op);
		if (ret)
			goto out_free_delayed;
	}
	return buf;

out_free_delayed:
	btrfs_free_delayed_extent_op(extent_op);
out_free_buf:
	free_extent_buffer(buf);
out_free_reserved:
	btrfs_free_reserved_extent(fs_info, ins.objectid, ins.offset, 0);
out_unuse:
	unuse_block_rsv(fs_info, block_rsv, blocksize);
	return ERR_PTR(ret);
}

Contributors
Person Tokens Prop Commits CommitProp
zheng yan zheng yan 249 56.21% 3 15.00%
omar sandoval omar sandoval 86 19.41% 1 5.00%
josef bacik josef bacik 59 13.32% 3 15.00%
david sterba david sterba 18 4.06% 3 15.00%
jeff mahoney jeff mahoney 14 3.16% 4 20.00%
chris mason chris mason 9 2.03% 2 10.00%
miao xie miao xie 4 0.90% 2 10.00%
wang xiaoguang wang xiaoguang 2 0.45% 1 5.00%
arne jansen arne jansen 2 0.45% 1 5.00%
Total 443 100.00% 20 100.00%


struct walk_control {
	
u64 refs[BTRFS_MAX_LEVEL];
	
u64 flags[BTRFS_MAX_LEVEL];
	
struct btrfs_key update_progress;
	
int stage;
	
int level;
	
int shared_level;
	
int update_ref;
	
int keep_locks;
	
int reada_slot;
	
int reada_count;
	
int for_reloc;
};


#define DROP_REFERENCE	1

#define UPDATE_BACKREF	2



static noinline void reada_walk_down(struct btrfs_trans_handle *trans,
				     struct btrfs_root *root,
				     struct walk_control *wc,
				     struct btrfs_path *path)
{
	struct btrfs_fs_info *fs_info = root->fs_info;
	u64 bytenr;
	u64 generation;
	u64 refs;
	u64 flags;
	u32 nritems;
	struct btrfs_key key;
	struct extent_buffer *eb;
	int ret;
	int slot;
	int nread = 0;

	if (path->slots[wc->level] < wc->reada_slot) {
		wc->reada_count = wc->reada_count * 2 / 3;
		wc->reada_count = max(wc->reada_count, 2);
	} else {
		wc->reada_count = wc->reada_count * 3 / 2;
		wc->reada_count = min_t(int, wc->reada_count,
					BTRFS_NODEPTRS_PER_BLOCK(fs_info));
	}

	eb = path->nodes[wc->level];
	nritems = btrfs_header_nritems(eb);

	for (slot = path->slots[wc->level]; slot < nritems; slot++) {
		if (nread >= wc->reada_count)
			break;

		cond_resched();
		bytenr = btrfs_node_blockptr(eb, slot);
		generation = btrfs_node_ptr_generation(eb, slot);

		if (slot == path->slots[wc->level])
			goto reada;

		if (wc->stage == UPDATE_BACKREF &&
		    generation <= root->root_key.offset)
			continue;

		/* We don't lock the tree block, it's OK to be racy here */
		ret = btrfs_lookup_extent_info(trans, fs_info, bytenr,
					       wc->level - 1, 1, &refs,
					       &flags);
		/* We don't care about errors in readahead. */
		if (ret < 0)
			continue;
		BUG_ON(refs == 0);

		if (wc->stage == DROP_REFERENCE) {
			if (refs == 1)
				goto reada;

			if (wc->level == 1 &&
			    (flags & BTRFS_BLOCK_FLAG_FULL_BACKREF))
				continue;
			if (!wc->update_ref ||
			    generation <= root->root_key.offset)
				continue;
			btrfs_node_key_to_cpu(eb, &key, slot);
			ret = btrfs_comp_cpu_keys(&key,
						  &wc->update_progress);
			if (ret < 0)
				continue;
		} else {
			if (wc->level == 1 &&
			    (flags & BTRFS_BLOCK_FLAG_FULL_BACKREF))
				continue;
		}
reada:
		readahead_tree_block(fs_info, bytenr);
		nread++;
	}
	wc->reada_slot = slot;
}

Contributors
Person Tokens Prop Commits CommitProp
zheng yan zheng yan 379 93.35% 7 53.85%
jeff mahoney jeff mahoney 19 4.68% 4 30.77%
josef bacik josef bacik 7 1.72% 1 7.69%
chris mason chris mason 1 0.25% 1 7.69%
Total 406 100.00% 13 100.00%

/*
 * helper to process tree block while walking down the tree.
 *
 * when wc->stage == UPDATE_BACKREF, this function updates
 * back refs for pointers in the block.
 *
 * NOTE: return value 1 means we should stop walking down.
 */


static noinline int walk_down_proc(struct btrfs_trans_handle *trans,
				   struct btrfs_root *root,
				   struct btrfs_path *path,
				   struct walk_control *wc, int lookup_info)
{
	struct btrfs_fs_info *fs_info = root->fs_info;
	int level = wc->level;
	struct extent_buffer *eb = path->nodes[level];
	u64 flag = BTRFS_BLOCK_FLAG_FULL_BACKREF;
	int ret;

	if (wc->stage == UPDATE_BACKREF &&
	    btrfs_header_owner(eb) != root->root_key.objectid)
		return 1;

	/*
         * when reference count of tree block is 1, it won't increase
         * again. once full backref flag is set, we never clear it.
         */
	if (lookup_info &&
	    ((wc->stage == DROP_REFERENCE && wc->refs[level] != 1) ||
	     (wc->stage == UPDATE_BACKREF && !(wc->flags[level] & flag)))) {
		BUG_ON(!path->locks[level]);
		ret = btrfs_lookup_extent_info(trans, fs_info,
					       eb->start, level, 1,
					       &wc->refs[level],
					       &wc->flags[level]);
		BUG_ON(ret == -ENOMEM);
		if (ret)
			return ret;
		BUG_ON(wc->refs[level] == 0);
	}

	if (wc->stage == DROP_REFERENCE) {
		if (wc->refs[level] > 1)
			return 1;

		if (path->locks[level] && !wc->keep_locks) {
			btrfs_tree_unlock_rw(eb, path->locks[level]);
			path->locks[level] = 0;
		}
		return 0;
	}

	/* wc->stage == UPDATE_BACKREF */
	if (!(wc->flags[level] & flag)) {
		BUG_ON(!path->locks[level]);
		ret = btrfs_inc_ref(trans, root, eb, 1);
		BUG_ON(ret); /* -ENOMEM */
		ret = btrfs_dec_ref(trans, root, eb, 0);
		BUG_ON(ret); /* -ENOMEM */
		ret = btrfs_set_disk_extent_flags(trans, fs_info, eb->start,
						  eb->len, flag,
						  btrfs_header_level(eb), 0);
		BUG_ON(ret); /* -ENOMEM */
		wc->flags[level] |= flag;
	}

	/*
         * the block is shared by multiple trees, so it's not good to
         * keep the tree lock
         */
	if (path->locks[level] && level > 0) {
		btrfs_tree_unlock_rw(eb, path->locks[level]);
		path->locks[level] = 0;
	}
	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
zheng yan zheng yan 367 88.22% 4 40.00%
jeff mahoney jeff mahoney 24 5.77% 2 20.00%
chris mason chris mason 16 3.85% 1 10.00%
josef bacik josef bacik 6 1.44% 2 20.00%
arne jansen arne jansen 3 0.72% 1 10.00%
Total 416 100.00% 10 100.00%

/*
 * helper to process tree block pointer.
 *
 * when wc->stage == DROP_REFERENCE, this function checks
 * reference count of the block pointed to. if the block
 * is shared and we need update back refs for the subtree
 * rooted at the block, this function changes wc->stage to
 * UPDATE_BACKREF. if the block is shared and there is no
 * need to update back, this function drops the reference
 * to the block.
 *
 * NOTE: return value 1 means we should stop walking down.
 */


static noinline int do_walk_down(struct btrfs_trans_handle *trans,
				 struct btrfs_root *root,
				 struct btrfs_path *path,
				 struct walk_control *wc, int *lookup_info)
{
	struct btrfs_fs_info *fs_info = root->fs_info;
	u64 bytenr;
	u64 generation;
	u64 parent;
	u32 blocksize;
	struct btrfs_key key;
	struct extent_buffer *next;
	int level = wc->level;
	int reada = 0;
	int ret = 0;
	bool need_account = false;

	generation = btrfs_node_ptr_generation(path->nodes[level],
					       path->slots[level]);
	/*
         * if the lower level block was created before the snapshot
         * was created, we know there is no need to update back refs
         * for the subtree
         */
	if (wc->stage == UPDATE_BACKREF &&
	    generation <= root->root_key.offset) {
		*lookup_info = 1;
		return 1;
	}

	bytenr = btrfs_node_blockptr(path->nodes[level], path->slots[level]);
	blocksize = fs_info->nodesize;

	next = find_extent_buffer(fs_info, bytenr);
	if (!next) {
		next = btrfs_find_create_tree_block(fs_info, bytenr);
		if (IS_ERR(next))
			return PTR_ERR(next);

		btrfs_set_buffer_lockdep_class(root->root_key.objectid, next,
					       level - 1);
		reada = 1;
	}
	btrfs_tree_lock(next);
	btrfs_set_lock_blocking(next);

	ret = btrfs_lookup_extent_info(trans, fs_info, bytenr, level - 1, 1,
				       &wc->refs[level - 1],
				       &wc->flags[level - 1]);
	if (ret < 0)
		goto out_unlock;

	if (unlikely(wc->refs[level - 1] == 0)) {
		btrfs_err(fs_info, "Missing references.");
		ret = -EIO;
		goto out_unlock;
	}
	*lookup_info = 0;

	if (wc->stage == DROP_REFERENCE) {
		if (wc->refs[level - 1] > 1) {
			need_account = true;
			if (level == 1 &&
			    (wc->flags[0] & BTRFS_BLOCK_FLAG_FULL_BACKREF))
				goto skip;

			if (!wc->update_ref ||
			    generation <= root->root_key.offset)
				goto skip;

			btrfs_node_key_to_cpu(path->nodes[level], &key,
					      path->slots[level]);
			ret = btrfs_comp_cpu_keys(&key, &wc->update_progress);
			if (ret < 0)
				goto skip;

			wc->stage = UPDATE_BACKREF;
			wc->shared_level = level - 1;
		}
	} else {
		if (level == 1 &&
		    (wc->flags[0] & BTRFS_BLOCK_FLAG_FULL_BACKREF))
			goto skip;
	}

	if (!btrfs_buffer_uptodate(next, generation, 0)) {
		btrfs_tree_unlock(next);
		free_extent_buffer(next);
		next = NULL;
		*lookup_info = 1;
	}

	if (!next) {
		if (reada && level == 1)
			reada_walk_down(trans, root, wc, path);
		next = read_tree_block(fs_info, bytenr, generation);
		if (IS_ERR(next)) {
			return PTR_ERR(next);
		} else if (!extent_buffer_uptodate(next)) {
			free_extent_buffer(next);
			return -EIO;
		}
		btrfs_tree_lock(next);
		btrfs_set_lock_blocking(next);
	}

	level--;
	ASSERT(level == btrfs_header_level(next));
	if (level != btrfs_header_level(next)) {
		btrfs_err(root->fs_info, "mismatched level");
		ret = -EIO;
		goto out_unlock;
	}
	path->nodes[level] = next;
	path->slots[level] = 0;
	path->locks[level] = BTRFS_WRITE_LOCK_BLOCKING;
	wc->level = level;
	if (wc->level == 1)
		wc->reada_slot = 0;
	return 0;
skip:
	wc->refs[level - 1] = 0;
	wc->flags[level - 1] = 0;
	if (wc->stage == DROP_REFERENCE) {
		if (wc->flags[level] & BTRFS_BLOCK_FLAG_FULL_BACKREF) {
			parent = path->nodes[level]->start;
		} else {
			ASSERT(root->root_key.objectid ==
			       btrfs_header_owner(path->nodes[level]));
			if (root->root_key.objectid !=
			    btrfs_header_owner(path->nodes[level])) {
				btrfs_err(root->fs_info,
						"mismatched block owner");
				ret = -EIO;
				goto out_unlock;
			}
			parent = 0;
		}

		if (need_account) {
			ret = btrfs_qgroup_trace_subtree(trans, root, next,
							 generation, level - 1);
			if (ret) {
				btrfs_err_rl(fs_info,
					     "Error %d accounting shared subtree. Quota is out of sync, rescan required.",
					     ret);
			}
		}
		ret = btrfs_free_extent(trans, fs_info, bytenr, blocksize,
					parent, root->root_key.objectid,
					level - 1, 0);
		if (ret)
			goto out_unlock;
	}

	*lookup_info = 1;
	ret = 1;

out_unlock:
	btrfs_tree_unlock(next);
	free_extent_buffer(next);

	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
zheng yan zheng yan 619 70.82% 8 25.00%
josef bacik josef bacik 127 14.53% 4 12.50%
mark fasheh mark fasheh 43 4.92% 1 3.12%
liu bo liu bo 22 2.52% 2 6.25%
jeff mahoney jeff mahoney 21 2.40% 5 15.62%
simon kirby simon kirby 13 1.49% 1 3.12%
chris mason chris mason 9 1.03% 4 12.50%
tsutomu itoh tsutomu itoh 8 0.92% 1 3.12%
miao xie miao xie 6 0.69% 1 3.12%
david sterba david sterba 4 0.46% 3 9.38%
qu wenruo qu wenruo 1 0.11% 1 3.12%
daniel dressler daniel dressler 1 0.11% 1 3.12%
Total 874 100.00% 32 100.00%

/*
 * helper to process tree block while walking up the tree.
 *
 * when wc->stage == DROP_REFERENCE, this function drops
 * reference count on the block.
 *
 * when wc->stage == UPDATE_BACKREF, this function changes
 * wc->stage back to DROP_REFERENCE if we changed wc->stage
 * to UPDATE_BACKREF previously while processing the block.
 *
 * NOTE: return value 1 means we should stop walking up.
 */


static noinline int walk_up_proc(struct btrfs_trans_handle *trans,
				 struct btrfs_root *root,
				 struct btrfs_path *path,
				 struct walk_control *wc)
{
	struct btrfs_fs_info *fs_info = root->fs_info;
	int ret;
	int level = wc->level;
	struct extent_buffer *eb = path->nodes[level];
	u64 parent = 0;

	if (wc->stage == UPDATE_BACKREF) {
		BUG_ON(wc->shared_level < level);
		if (level < wc->shared_level)
			goto out;

		ret = find_next_key(path, level + 1, &wc->update_progress);
		if (ret > 0)
			wc->update_ref = 0;

		wc->stage = DROP_REFERENCE;
		wc->shared_level = -1;
		path->slots[level] = 0;

		/*
                 * check reference count again if the block isn't locked.
                 * we should start walking down the tree again if reference
                 * count is one.
                 */
		if (!path->locks[level]) {
			BUG_ON(level == 0);
			btrfs_tree_lock(eb);
			btrfs_set_lock_blocking(eb);
			path->locks[level] = BTRFS_WRITE_LOCK_BLOCKING;

			ret = btrfs_lookup_extent_info(trans, fs_info,
						       eb->start, level, 1,
						       &wc->refs[level],
						       &wc->flags[level]);
			if (ret < 0) {
				btrfs_tree_unlock_rw(eb, path->locks[level]);
				path->locks[level] = 0;
				return ret;
			}
			BUG_ON(wc->refs[level] == 0);
			if (wc->refs[level] == 1) {
				btrfs_tree_unlock_rw(eb, path->locks[level]);
				path->locks[level] = 0;
				return 1;
			}
		}
	}

	/* wc->stage == DROP_REFERENCE */
	BUG_ON(wc->refs[level] > 1 && !path->locks[level]);

	if (wc->refs[level] == 1) {
		if (level == 0) {
			if (wc->flags[level] & BTRFS_BLOCK_FLAG_FULL_BACKREF)
				ret = btrfs_dec_ref(trans, root, eb, 1);
			else
				ret = btrfs_dec_ref(trans, root, eb, 0);
			BUG_ON(ret); /* -ENOMEM */
			ret = btrfs_qgroup_trace_leaf_items(trans, fs_info, eb);
			if (ret) {
				btrfs_err_rl(fs_info,
					     "error %d accounting leaf items. Quota is out of sync, rescan required.",
					     ret);
			}
		}
		/* make block locked assertion in clean_tree_block happy */
		if (!path->locks[level] &&
		    btrfs_header_generation(eb) == trans->transid) {
			btrfs_tree_lock(eb);
			btrfs_set_lock_blocking(eb);
			path->locks[level] = BTRFS_WRITE_LOCK_BLOCKING;
		}
		clean_tree_block(trans, fs_info, eb);
	}

	if (eb == root->node) {
		if (wc->flags[level] & BTRFS_BLOCK_FLAG_FULL_BACKREF)
			parent = eb->start;
		else
			BUG_ON(root->root_key.objectid !=
			       btrfs_header_owner(eb));
	} else {
		if (wc->flags[level + 1] & BTRFS_BLOCK_FLAG_FULL_BACKREF)
			parent = path->nodes[level + 1]->start;
		else
			BUG_ON(root->root_key.objectid !=
			       btrfs_header_owner(path->nodes[level + 1]));
	}

	btrfs_free_tree_block(trans, root, eb, parent, wc->refs[level] == 1);
out:
	wc->refs[level] = 0;
	wc->flags[level] = 0;
	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
zheng yan zheng yan 496 83.50% 4 21.05%
jeff mahoney jeff mahoney 33 5.56% 4 21.05%
mark fasheh mark fasheh 21 3.54% 1 5.26%
chris mason chris mason 19 3.20% 5 26.32%
liu bo liu bo 18 3.03% 1 5.26%
josef bacik josef bacik 3 0.51% 1 5.26%
david sterba david sterba 2 0.34% 1 5.26%
qu wenruo qu wenruo 1 0.17% 1 5.26%
daniel dressler daniel dressler 1 0.17% 1 5.26%
Total 594 100.00% 19 100.00%



static noinline int walk_down_tree(struct btrfs_trans_handle *trans,
				   struct btrfs_root *root,
				   struct btrfs_path *path,
				   struct walk_control *wc)
{
	int level = wc->level;
	int lookup_info = 1;
	int ret;

	while (level >= 0) {
		ret = walk_down_proc(trans, root, path, wc, lookup_info);
		if (ret > 0)
			break;

		if (level == 0)
			break;

		if (path->slots[level] >=
		    btrfs_header_nritems(path->nodes[level]))
			break;

		ret = do_walk_down(trans, root, path, wc, &lookup_info);
		if (ret > 0) {
			path->slots[level]++;
			continue;
		} else if (ret < 0)
			return ret;
		level = wc->level;
	}
	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
zheng yan zheng yan 139 92.05% 6 75.00%
miao xie miao xie 10 6.62% 1 12.50%
chris mason chris mason 2 1.32% 1 12.50%
Total 151 100.00% 8 100.00%



static noinline int walk_up_tree(struct btrfs_trans_handle *trans,
				 struct btrfs_root *root,
				 struct btrfs_path *path,
				 struct walk_control *wc, int max_level)
{
	int level = wc->level;
	int ret;

	path->slots[level] = btrfs_header_nritems(path->nodes[level]);
	while (level < max_level && path->nodes[level]) {
		wc->level = level;
		if (path->slots[level] + 1 <
		    btrfs_header_nritems(path->nodes[level])) {
			path->slots[level]++;
			return 0;
		} else {
			ret = walk_up_proc(trans, root, path, wc);
			if (ret > 0)
				return 0;

			if (path->locks[level]) {
				btrfs_tree_unlock_rw(path->nodes[level],
						     path->locks[level]);
				path->locks[level] = 0;
			}
			free_extent_buffer(path->nodes[level]);
			path->nodes[level] = NULL;
			level++;
		}
	}
	return 1;
}

Contributors
Person Tokens Prop Commits CommitProp
zheng yan zheng yan 183 91.96% 3 37.50%
chris mason chris mason 16 8.04% 5 62.50%
Total 199 100.00% 8 100.00%

/*
 * drop a subvolume tree.
 *
 * this function traverses the tree freeing any blocks that only
 * referenced by the tree.
 *
 * when a shared tree block is found. this function decreases its
 * reference count by one. if update_ref is true, this function
 * also make sure backrefs for the shared block and all lower level
 * blocks are properly updated.
 *
 * If called with for_reloc == 0, may exit early with -EAGAIN
 */


int btrfs_drop_snapshot(struct btrfs_root *root,
			 struct btrfs_block_rsv *block_rsv, int update_ref,
			 int for_reloc)
{
	struct btrfs_fs_info *fs_info = root->fs_info;
	struct btrfs_path *path;
	struct btrfs_trans_handle *trans;
	struct btrfs_root *tree_root = fs_info->tree_root;
	struct btrfs_root_item *root_item = &root->root_item;
	struct walk_control *wc;
	struct btrfs_key key;
	int err = 0;
	int ret;
	int level;
	bool root_dropped = false;

	btrfs_debug(fs_info, "Drop subvolume %llu", root->objectid);

	path = btrfs_alloc_path();
	if (!path) {
		err = -ENOMEM;
		goto out;
	}

	wc = kzalloc(sizeof(*wc), GFP_NOFS);
	if (!wc) {
		btrfs_free_path(path);
		err = -ENOMEM;
		goto out;
	}

	trans = btrfs_start_transaction(tree_root, 0);
	if (IS_ERR(trans)) {
		err = PTR_ERR(trans);
		goto out_free;
	}

	if (block_rsv)
		trans->block_rsv = block_rsv;

	if (btrfs_disk_key_objectid(&root_item->drop_progress) == 0) {
		level = btrfs_header_level(root->node);
		path->nodes[level] = btrfs_lock_root_node(root);
		btrfs_set_lock_blocking(path->nodes[level]);
		path->slots[level] = 0;
		path->locks[level] = BTRFS_WRITE_LOCK_BLOCKING;
		memset(&wc->update_progress, 0,
		       sizeof(wc->update_progress));
	} else {
		btrfs_disk_key_to_cpu(&key, &root_item->drop_progress);
		memcpy(&wc->update_progress, &key,
		       sizeof(wc->update_progress));

		level = root_item->drop_level;
		BUG_ON(level == 0);
		path->lowest_level = level;
		ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
		path->lowest_level = 0;
		if (ret < 0) {
			err = ret;
			goto out_end_trans;
		}
		WARN_ON(ret > 0);

		/*
                 * unlock our path, this is safe because only this
                 * function is allowed to delete this snapshot
                 */
		btrfs_unlock_up_safe(path, 0);

		level = btrfs_header_level(root->node);
		while (1) {
			btrfs_tree_lock(path->nodes[level]);
			btrfs_set_lock_blocking(path->nodes[level]);
			path->locks[level] = BTRFS_WRITE_LOCK_BLOCKING;

			ret = btrfs_lookup_extent_info(trans, fs_info,
						path->nodes[level]->start,
						level, 1, &wc->refs[level],
						&wc->flags[level]);
			if (ret < 0) {
				err = ret;
				goto out_end_trans;
			}
			BUG_ON(wc->refs[level] == 0);

			if (level == root_item->drop_level)
				break;

			btrfs_tree_unlock(path->nodes[level]);
			path->locks[level] = 0;
			WARN_ON(wc->refs[level] != 1);
			level--;
		}
	}

	wc->level = level;
	wc->shared_level = -1;
	wc->stage = DROP_REFERENCE;
	wc->update_ref = update_ref;
	wc->keep_locks = 0;
	wc->for_reloc = for_reloc;
	wc->reada_count = BTRFS_NODEPTRS_PER_BLOCK(fs_info);

	while (1) {

		ret = walk_down_tree(trans, root, path, wc);
		if (ret < 0) {
			err = ret;
			break;
		}

		ret = walk_up_tree(trans, root, path, wc, BTRFS_MAX_LEVEL);
		if (ret < 0) {
			err = ret;
			break;
		}

		if (ret > 0) {
			BUG_ON(wc->stage != DROP_REFERENCE);
			break;
		}

		if (wc->stage == DROP_REFERENCE) {
			level = wc->level;
			btrfs_node_key(path->nodes[level],
				       &root_item->drop_progress,
				       path->slots[level]);
			root_item->drop_level = level;
		}

		BUG_ON(wc->level == 0);
		if (btrfs_should_end_transaction(trans) ||
		    (!for_reloc && btrfs_need_cleaner_sleep(fs_info))) {
			ret = btrfs_update_root(trans, tree_root,
						&root->root_key,
						root_item);
			if (ret) {
				btrfs_abort_transaction(trans, ret);
				err = ret;
				goto out_end_trans;
			}

			btrfs_end_transaction_throttle(trans);
			if (!for_reloc && btrfs_need_cleaner_sleep(fs_info)) {
				btrfs_debug(fs_info,
					    "drop snapshot early exit");
				err = -EAGAIN;
				goto out_free;
			}

			trans = btrfs_start_transaction(tree_root, 0);
			if (IS_ERR(trans)) {
				err = PTR_ERR(trans);
				goto out_free;
			}
			if (block_rsv)
				trans->block_rsv = block_rsv;
		}
	}
	btrfs_release_path(path);
	if (err)
		goto out_end_trans;

	ret = btrfs_del_root(trans, tree_root, &root->root_key);
	if (ret) {
		btrfs_abort_transaction(trans, ret);
		goto out_end_trans;
	}

	if (root->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID) {
		ret = btrfs_find_root(tree_root, &root->root_key, path,
				      NULL, NULL);
		if (ret < 0) {
			btrfs_abort_transaction(trans, ret);
			err = ret;
			goto out_end_trans;
		} else if (ret > 0) {
			/* if we fail to delete the orphan item this time
                         * around, it'll get picked up the next time.
                         *
                         * The most common failure here is just -ENOENT.
                         */
			btrfs_del_orphan_item(trans, tree_root,
					      root->root_key.objectid);
		}
	}

	if (test_bit(BTRFS_ROOT_IN_RADIX, &root->state)) {
		btrfs_add_dropped_root(trans, root);
	} else {
		free_extent_buffer(root->node);
		free_extent_buffer(root->commit_root);
		btrfs_put_fs_root(root);
	}
	root_dropped = true;
out_end_trans:
	btrfs_end_transaction_throttle(trans);
out_free:
	kfree(wc);
	btrfs_free_path(path);
out:
	/*
         * So if we need to stop dropping the snapshot for whatever reason we
         * need to make sure to add it back to the dead root list so that we
         * keep trying to do the work later.  This also cleans up roots if we
         * don't have it in the radix (like when we recover after a power fail
         * or unmount) so we don't leak memory.
         */
	if (!for_reloc && root_dropped == false)
		btrfs_add_dead_root(root);
	if (err && err != -EAGAIN)
		btrfs_handle_fs_error(fs_info, err, NULL);
	return err;
}

Contributors
Person Tokens Prop Commits CommitProp
zheng yan zheng yan 735 70.27% 8 20.00%
jeff mahoney jeff mahoney 116 11.09% 5 12.50%
josef bacik josef bacik 78 7.46% 7 17.50%
tsutomu itoh tsutomu itoh 37 3.54% 2 5.00%
mark fasheh mark fasheh 26 2.49% 2 5.00%
chris mason chris mason 25 2.39% 9 22.50%
miao xie miao xie 12 1.15% 3 7.50%
arne jansen arne jansen 9 0.86% 1 2.50%
wang shilong wang shilong 5 0.48% 1 2.50%
anand jain anand jain 3 0.29% 2 5.00%
Total 1046 100.00% 40 100.00%

/*
 * drop subtree rooted at tree block 'node'.
 *
 * NOTE: this function will unlock and release tree block 'node'
 * only used by relocation code
 */


int btrfs_drop_subtree(struct btrfs_trans_handle *trans,
			struct btrfs_root *root,
			struct extent_buffer *node,
			struct extent_buffer *parent)
{
	struct btrfs_fs_info *fs_info = root->fs_info;
	struct btrfs_path *path;
	struct walk_control *wc;
	int level;
	int parent_level;
	int ret = 0;
	int wret;

	BUG_ON(root->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID);

	path = btrfs_alloc_path();
	if (!path)
		return -ENOMEM;

	wc = kzalloc(sizeof(*wc), GFP_NOFS);
	if (!wc) {
		btrfs_free_path(path);
		return -ENOMEM;
	}

	btrfs_assert_tree_locked(parent);
	parent_level = btrfs_header_level(parent);
	extent_buffer_get(parent);
	path->nodes[parent_level] = parent;
	path->slots[parent_level] = btrfs_header_nritems(parent);

	btrfs_assert_tree_locked(node);
	level = btrfs_header_level(node);
	path->nodes[level] = node;
	path->slots[level] = 0;
	path->locks[level] = BTRFS_WRITE_LOCK_BLOCKING;

	wc->refs[parent_level] = 1;
	wc->flags[parent_level] = BTRFS_BLOCK_FLAG_FULL_BACKREF;
	wc->level = level;
	wc->shared_level = -1;
	wc->stage = DROP_REFERENCE;
	wc->update_ref = 0;
	wc->keep_locks = 1;
	wc->for_reloc = 1;
	wc->reada_count = BTRFS_NODEPTRS_PER_BLOCK(fs_info);

	while (1) {
		wret = walk_down_tree(trans, root, path, wc);
		if (wret < 0) {
			ret = wret;
			break;
		}

		wret = walk_up_tree(trans, root, path, wc, parent_level);
		if (wret < 0)
			ret = wret;
		if (wret != 0)
			break;
	}

	kfree(wc);
	btrfs_free_path(path);
	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
zheng yan zheng yan 266 80.61% 5 29.41%
chris mason chris mason 29 8.79% 8 47.06%
tsutomu itoh tsutomu itoh 19 5.76% 1 5.88%
jeff mahoney jeff mahoney 10 3.03% 2 11.76%
arne jansen arne jansen 6 1.82% 1 5.88%
Total 330 100.00% 17 100.00%



static u64 update_block_group_flags(struct btrfs_fs_info *fs_info, u64 flags)
{
	u64 num_devices;
	u64 stripped;

	/*
         * if restripe for this chunk_type is on pick target profile and
         * return, otherwise do the usual balance
         */
	stripped = get_restripe_target(fs_info, flags);
	if (stripped)
		return extended_to_chunk(stripped);

	num_devices = fs_info->fs_devices->rw_devices;

	stripped = BTRFS_BLOCK_GROUP_RAID0 |
		BTRFS_BLOCK_GROUP_RAID5 | BTRFS_BLOCK_GROUP_RAID6 |
		BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_RAID10;

	if (num_devices == 1) {
		stripped |= BTRFS_BLOCK_GROUP_DUP;
		stripped = flags & ~stripped;

		/* turn raid0 into single device chunks */
		if (flags & BTRFS_BLOCK_GROUP_RAID0)
			return stripped;

		/* turn mirroring into duplication */
		if (flags & (BTRFS_BLOCK_GROUP_RAID1 |
			     BTRFS_BLOCK_GROUP_RAID10))
			return stripped | BTRFS_BLOCK_GROUP_DUP;
	} else {
		/* they already had raid on here, just return */
		if (flags & stripped)
			return flags;

		stripped |= BTRFS_BLOCK_GROUP_DUP;
		stripped = flags & ~stripped;

		/* switch duplicated blocks with raid1 */
		if (flags & BTRFS_BLOCK_GROUP_DUP)
			return stripped | BTRFS_BLOCK_GROUP_RAID1;

		/* this is drive concat, leave it alone */
	}

	return flags;
}

Contributors
Person Tokens Prop Commits CommitProp
zheng yan zheng yan 103 71.03% 3 23.08%
ilya dryomov ilya dryomov 29 20.00% 4 30.77%
chris mason chris mason 7 4.83% 4 30.77%
david woodhouse david woodhouse 4 2.76% 1 7.69%
jeff mahoney jeff mahoney 2 1.38% 1 7.69%
Total 145 100.00% 13 100.00%



static int inc_block_group_ro(struct btrfs_block_group_cache *cache, int force)
{
	struct btrfs_space_info *sinfo = cache->space_info;
	u64 num_bytes;
	u64 min_allocable_bytes;
	int ret = -ENOSPC;

	/*
         * We need some metadata space and system metadata space for
         * allocating chunks in some corner cases until we force to set
         * it to be readonly.
         */
	if ((sinfo->flags &
	     (BTRFS_BLOCK_GROUP_SYSTEM | BTRFS_BLOCK_GROUP_METADATA)) &&
	    !force)
		min_allocable_bytes = SZ_1M;
	else
		min_allocable_bytes = 0;

	spin_lock(&sinfo->lock);
	spin_lock(&cache->lock);

	if (cache->ro) {
		cache->ro++;
		ret = 0;
		goto out;
	}

	num_bytes = cache->key.offset - cache->reserved - cache->pinned -
		    cache->bytes_super - btrfs_block_group_used(&cache->item);

	if (sinfo->bytes_used + sinfo->bytes_reserved + sinfo->bytes_pinned +
	    sinfo->bytes_may_use + sinfo->bytes_readonly + num_bytes +
	    min_allocable_bytes <= sinfo->total_bytes) {
		sinfo->bytes_readonly += num_bytes;
		cache->ro++;
		list_add_tail(&cache->ro_list, &sinfo->ro_bgs);
		ret = 0;
	}
out:
	spin_unlock(&cache->lock);
	spin_unlock(&sinfo->lock);
	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
zheng yan zheng yan 126 60.87% 4 33.33%
miao xie miao xie 34 16.43% 1 8.33%
wubo wubo 17 8.21% 1 8.33%
josef bacik josef bacik 16 7.73% 2 16.67%
zhao lei zhao lei 7 3.38% 1 8.33%
chris mason chris mason 6 2.90% 2 16.67%
byongho lee byongho lee 1 0.48% 1 8.33%
Total 207 100.00% 12 100.00%



int btrfs_inc_block_group_ro(struct btrfs_root *root,
			     struct btrfs_block_group_cache *cache)

{
	struct btrfs_fs_info *fs_info = root->fs_info;
	struct btrfs_trans_handle *trans;
	u64 alloc_flags;
	int ret;

again:
	trans = btrfs_join_transaction(root);
	if (IS_ERR(trans))
		return PTR_ERR(trans);

	/*
         * we're not allowed to set block groups readonly after the dirty
         * block groups cache has started writing.  If it already started,
         * back off and let this transaction commit
         */
	mutex_lock(&fs_info->ro_block_group_mutex);
	if (test_bit(BTRFS_TRANS_DIRTY_BG_RUN, &trans->transaction->flags)) {
		u64 transid = trans->transid;

		mutex_unlock(&fs_info->ro_block_group_mutex);
		btrfs_end_transaction(trans);

		ret = btrfs_wait_for_commit(fs_info, transid);
		if (ret)
			return ret;
		goto again;
	}

	/*
         * if we are changing raid levels, try to allocate a corresponding
         * block group with the new raid level.
         */
	alloc_flags = update_block_group_flags(fs_info, cache->flags);
	if (alloc_flags != cache->flags) {
		ret = do_chunk_alloc(trans, fs_info, alloc_flags,
				     CHUNK_ALLOC_FORCE);
		/*
                 * ENOSPC is allowed here, we may have enough space
                 * already allocated at the new raid level to
                 * carry on
                 */
		if (ret == -ENOSPC)
			ret = 0;
		if (ret < 0)
			goto out;
	}

	ret = inc_block_group_ro(cache, 0);
	if (!ret)
		goto out;
	alloc_flags = get_alloc_profile(fs_info, cache->space_info->flags);
	ret = do_chunk_alloc(trans, fs_info, alloc_flags,
			     CHUNK_ALLOC_FORCE);
	if (ret < 0)
		goto out;
	ret = inc_block_group_ro(cache, 0);
out:
	if (cache->flags & BTRFS_BLOCK_GROUP_SYSTEM) {
		alloc_flags = update_block_group_flags(fs_info, cache->flags);
		mutex_lock(&fs_info->chunk_mutex);
		check_system_chunk(trans, fs_info, alloc_flags);
		mutex_unlock(&fs_info->chunk_mutex);
	}
	mutex_unlock(&fs_info->ro_block_group_mutex);

	btrfs_end_transaction(trans);
	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
chris mason chris mason 129 42.72% 6 30.00%
zheng yan zheng yan 91 30.13% 4 20.00%
shaohua li shaohua li 28 9.27% 1 5.00%
jeff mahoney jeff mahoney 24 7.95% 4 20.00%
david sterba david sterba 8 2.65% 1 5.00%
filipe david borba manana filipe david borba manana 8 2.65% 1 5.00%
josef bacik josef bacik 7 2.32% 1 5.00%
miao xie miao xie 4 1.32% 1 5.00%
zhao lei zhao lei 3 0.99% 1 5.00%
Total 302 100.00% 20 100.00%



int btrfs_force_chunk_alloc(struct btrfs_trans_handle *trans,
			    struct btrfs_fs_info *fs_info, u64 type)
{
	u64 alloc_flags = get_alloc_profile(fs_info, type);

	return do_chunk_alloc(trans, fs_info, alloc_flags, CHUNK_ALLOC_FORCE);
}

Contributors
Person Tokens Prop Commits CommitProp
chris mason chris mason 36 90.00% 2 66.67%
jeff mahoney jeff mahoney 4 10.00% 1 33.33%
Total 40 100.00% 3 100.00%

/*
 * helper to account the unused space of all the readonly block group in the
 * space_info. takes mirrors into account.
 */


u64 btrfs_account_ro_block_groups_free_space(struct btrfs_space_info *sinfo)
{
	struct btrfs_block_group_cache *block_group;
	u64 free_bytes = 0;
	int factor;

	/* It's df, we don't care if it's racy */
	if (list_empty(&sinfo->ro_bgs))
		return 0;

	spin_lock(&sinfo->lock);
	list_for_each_entry(block_group, &sinfo->ro_bgs, ro_list) {
		spin_lock(&block_group->lock);

		if (!block_group->ro) {
			spin_unlock(&block_group->lock);
			continue;
		}

		if (block_group->flags & (BTRFS_BLOCK_GROUP_RAID1 |
					  BTRFS_BLOCK_GROUP_RAID10 |
					  BTRFS_BLOCK_GROUP_DUP))
			factor = 2;
		else
			factor = 1;

		free_bytes += (block_group->key.offset -
			       btrfs_block_group_used(&block_group->item)) *
			       factor;

		spin_unlock(&block_group->lock);
	}
	spin_unlock(&sinfo->lock);

	return free_bytes;
}

Contributors
Person Tokens Prop Commits CommitProp
miao xie miao xie 116 81.12% 1 33.33%
josef bacik josef bacik 26 18.18% 1 33.33%
nicholas d steeves nicholas d steeves 1 0.70% 1 33.33%
Total 143 100.00% 3 100.00%



void btrfs_dec_block_group_ro(struct btrfs_block_group_cache *cache)
{
	struct btrfs_space_info *sinfo = cache->space_info;
	u64 num_bytes;

	BUG_ON(!cache->ro);

	spin_lock(&sinfo->lock);
	spin_lock(&cache->lock);
	if (!--cache->ro) {
		num_bytes = cache->key.offset - cache->reserved -
			    cache->pinned - cache->bytes_super -
			    btrfs_block_group_used(&cache->item);
		sinfo->bytes_readonly -= num_bytes;
		list_del_init(&cache->ro_list);
	}
	spin_unlock(&cache->lock);
	spin_unlock(&sinfo->lock);
}

Contributors
Person Tokens Prop Commits CommitProp
zheng yan zheng yan 90 78.95% 4 44.44%
zhao lei zhao lei 11 9.65% 1 11.11%
josef bacik josef bacik 8 7.02% 1 11.11%
chris mason chris mason 4 3.51% 2 22.22%
jeff mahoney jeff mahoney 1 0.88% 1 11.11%
Total 114 100.00% 9 100.00%

/*
 * checks to see if its even possible to relocate this block group.
 *
 * @return - -1 if it's not a good idea to relocate this block group, 0 if its
 * ok to go ahead and try.
 */


int btrfs_can_relocate(struct btrfs_fs_info *fs_info, u64 bytenr)
{
	struct btrfs_root *root = fs_info->extent_root;
	struct btrfs_block_group_cache *block_group;
	struct btrfs_space_info *space_info;
	struct btrfs_fs_devices *fs_devices = fs_info->fs_devices;
	struct btrfs_device *device;
	struct btrfs_trans_handle *trans;
	u64 min_free;
	u64 dev_min = 1;
	u64 dev_nr = 0;
	u64 target;
	int debug;
	int index;
	int full = 0;
	int ret = 0;

	debug = btrfs_test_opt(fs_info, ENOSPC_DEBUG);

	block_group = btrfs_lookup_block_group(fs_info, bytenr);

	/* odd, couldn't find the block group, leave it alone */
	if (!block_group) {
		if (debug)
			btrfs_warn(fs_info,
				   "can't find block group for bytenr %llu",
				   bytenr);
		return -1;
	}

	min_free = btrfs_block_group_used(&block_group->item);

	/* no bytes used, we're good */
	if (!min_free)
		goto out;

	space_info = block_group->space_info;
	spin_lock(&space_info->lock);

	full = space_info->full;

	/*
         * if this is the last block group we have in this space, we can't
         * relocate it unless we're able to allocate a new chunk below.
         *
         * Otherwise, we need to make sure we have room in the space to handle
         * all of the extents from this block group.  If we can, we're good
         */
	if ((space_info->total_bytes != block_group->key.offset) &&
	    (space_info->bytes_used + space_info->bytes_reserved +
	     space_info->bytes_pinned + space_info->bytes_readonly +
	     min_free < space_info->total_bytes)) {
		spin_unlock(&space_info->lock);
		goto out;
	}
	spin_unlock(&space_info->lock);

	/*
         * ok we don't have enough space, but maybe we have free space on our
         * devices to allocate new chunks for relocation, so loop through our
         * alloc devices and guess if we have enough space.  if this block
         * group is going to be restriped, run checks against the target
         * profile instead of the current one.
         */
	ret = -1;

	/*
         * index:
         *      0: raid10
         *      1: raid1
         *      2: dup
         *      3: raid0
         *      4: single
         */
	target = get_restripe_target(fs_info, block_group->flags);
	if (target) {
		index = __get_raid_index(extended_to_chunk(target));
	} else {
		/*
                 * this is just a balance, so if we were marked as full
                 * we know there is no space for a new chunk
                 */
		if (full) {
			if (debug)
				btrfs_warn(fs_info,
					   "no space to alloc new chunk for block group %llu",
					   block_group->key.objectid);
			goto out;
		}

		index = get_block_group_index(block_group);
	}

	if (index == BTRFS_RAID_RAID10) {
		dev_min = 4;
		/* Divide by 2 */
		min_free >>= 1;
	} else if (index == BTRFS_RAID_RAID1) {
		dev_min = 2;
	} else if (index == BTRFS_RAID_DUP) {
		/* Multiply by 2 */
		min_free <<= 1;
	} else if (index == BTRFS_RAID_RAID0) {
		dev_min = fs_devices->rw_devices;
		min_free = div64_u64(min_free, dev_min);
	}

	/* We need to do this so that we can look at pending chunks */
	trans = btrfs_join_transaction(root);
	if (IS_ERR(trans)) {
		ret = PTR_ERR(trans);
		goto out;
	}

	mutex_lock(&fs_info->chunk_mutex);
	list_for_each_entry(device, &fs_devices->alloc_list, dev_alloc_list) {
		u64 dev_offset;

		/*
                 * check to make sure we can actually find a chunk with enough
                 * space to fit our block group in.
                 */
		if (device->total_bytes > device->bytes_used + min_free &&
		    !device->is_tgtdev_for_dev_replace) {
			ret = find_free_dev_extent(trans, device, min_free,
						   &dev_offset, NULL);
			if (!ret)
				dev_nr++;

			if (dev_nr >= dev_min)
				break;

			ret = -1;
		}
	}
	if (debug && ret == -1)
		btrfs_warn(fs_info,
			   "no space to allocate a new chunk for block group %llu",
			   block_group->key.objectid);
	mutex_unlock(&fs_info->chunk_mutex);
	btrfs_end_transaction(trans);
out:
	btrfs_put_block_group(block_group);
	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
josef bacik josef bacik 280 54.58% 3 16.67%
liu bo liu bo 88 17.15% 2 11.11%
qu wenruo qu wenruo 67 13.06% 1 5.56%
ilya dryomov ilya dryomov 35 6.82% 1 5.56%
jeff mahoney jeff mahoney 12 2.34% 2 11.11%
chris mason chris mason 10 1.95% 2 11.11%
zheng yan zheng yan 8 1.56% 3 16.67%
stefan behrens stefan behrens 5 0.97% 1 5.56%
miao xie miao xie 5 0.97% 2 11.11%
david sterba david sterba 3 0.58% 1 5.56%
Total 513 100.00% 18 100.00%



static int find_first_block_group(struct btrfs_fs_info *fs_info,
				  struct btrfs_path *path,
				  struct btrfs_key *key)
{
	struct btrfs_root *root = fs_info->extent_root;
	int ret = 0;
	struct btrfs_key found_key;
	struct extent_buffer *leaf;
	int slot;

	ret = btrfs_search_slot(NULL, root, key, path, 0, 0);
	if (ret < 0)
		goto out;

	while (1) {
		slot = path->slots[0];
		leaf = path->nodes[0];
		if (slot >= btrfs_header_nritems(leaf)) {
			ret = btrfs_next_leaf(root, path);
			if (ret == 0)
				continue;
			if (ret < 0)
				goto out;
			break;
		}
		btrfs_item_key_to_cpu(leaf, &found_key, slot);

		if (found_key.objectid >= key->objectid &&
		    found_key.type == BTRFS_BLOCK_GROUP_ITEM_KEY) {
			struct extent_map_tree *em_tree;
			struct extent_map *em;

			em_tree = &root->fs_info->mapping_tree.map_tree;
			read_lock(&em_tree->lock);
			em = lookup_extent_mapping(em_tree, found_key.objectid,
						   found_key.offset);
			read_unlock(&em_tree->lock);
			if (!em) {
				btrfs_err(fs_info,
			"logical %llu len %llu found bg but no related chunk",
					  found_key.objectid, found_key.offset);
				ret = -ENOENT;
			} else {
				ret = 0;
			}
			free_extent_map(em);
			goto out;
		}
		path->slots[0]++;
	}
out:
	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
chris mason chris mason 151 56.13% 3 37.50%
liu bo liu bo 82 30.48% 1 12.50%
zheng yan zheng yan 19 7.06% 1 12.50%
jeff mahoney jeff mahoney 11 4.09% 1 12.50%
josef bacik josef bacik 5 1.86% 1 12.50%
christoph hellwig christoph hellwig 1 0.37% 1 12.50%
Total 269 100.00% 8 100.00%



void btrfs_put_block_group_cache(struct btrfs_fs_info *info)
{
	struct btrfs_block_group_cache *block_group;
	u64 last = 0;

	while (1) {
		struct inode *inode;

		block_group = btrfs_lookup_first_block_group(info, last);
		while (block_group) {
			spin_lock(&block_group->lock);
			if (block_group->iref)
				break;
			spin_unlock(&block_group->lock);
			block_group = next_block_group(info, block_group);
		}
		if (!block_group) {
			if (last == 0)
				break;
			last = 0;
			continue;
		}

		inode = block_group->inode;
		block_group->iref = 0;
		block_group->inode = NULL;
		spin_unlock(&block_group->lock);
		ASSERT(block_group->io_ctl.inode == NULL);
		iput(inode);
		last = block_group->key.objectid + block_group->key.offset;
		btrfs_put_block_group(block_group);
	}
}

Contributors
Person Tokens Prop Commits CommitProp
josef bacik josef bacik 147 93.04% 1 50.00%
liu bo liu bo 11 6.96% 1 50.00%
Total 158 100.00% 2 100.00%



int btrfs_free_block_groups(struct btrfs_fs_info *info)
{
	struct btrfs_block_group_cache *block_group;
	struct btrfs_space_info *space_info;
	struct btrfs_caching_control *caching_ctl;
	struct rb_node *n;

	down_write(&info->commit_root_sem);
	while (!list_empty(&info->caching_block_groups)) {
		caching_ctl = list_entry(info->caching_block_groups.next,
					 struct btrfs_caching_control, list);
		list_del(&caching_ctl->list);
		put_caching_control(caching_ctl);
	}
	up_write(&info->commit_root_sem);

	spin_lock(&info->unused_bgs_lock);
	while (!list_empty(&info->unused_bgs)) {
		block_group = list_first_entry(&info->unused_bgs,
					       struct btrfs_block_group_cache,
					       bg_list);
		list_del_init(&block_group->bg_list);
		btrfs_put_block_group(block_group);
	}
	spin_unlock(&info->unused_bgs_lock);

	spin_lock(&info->block_group_cache_lock);
	while ((n = rb_last(&info->block_group_cache_tree)) != NULL) {
		block_group = rb_entry(n, struct btrfs_block_group_cache,
				       cache_node);
		rb_erase(&block_group->cache_node,
			 &info->block_group_cache_tree);
		RB_CLEAR_NODE(&block_group->cache_node);
		spin_unlock(&info->block_group_cache_lock);

		down_write(&block_group->space_info->groups_sem);
		list_del(&block_group->list);
		up_write(&block_group->space_info->groups_sem);

		if (block_group->cached == BTRFS_CACHE_STARTED)
			wait_block_group_cache_done(block_group);

		/*
                 * We haven't cached this block group, which means we could
                 * possibly have excluded extents on this block group.
                 */
		if (block_group->cached == BTRFS_CACHE_NO ||
		    block_group->cached == BTRFS_CACHE_ERROR)
			free_excluded_extents(info, block_group);

		btrfs_remove_free_space_cache(block_group);
		ASSERT(list_empty(&block_group->dirty_list));
		ASSERT(list_empty(&block_group->io_list));
		ASSERT(list_empty(&block_group->bg_list));
		ASSERT(atomic_read(&block_group->count) == 1);
		btrfs_put_block_group(block_group);

		spin_lock(&info->block_group_cache_lock);
	}
	spin_unlock(&info->block_group_cache_lock);

	/* now that all the block groups are freed, go through and
         * free all the space_info structs.  This is only called during
         * the final stages of unmount, and so we know nobody is
         * using them.  We call synchronize_rcu() once before we start,
         * just to be on the safe side.
         */
	synchronize_rcu();

	release_global_block_rsv(info);

	while (!list_empty(&info->space_info)) {
		int i;

		space_info = list_entry(info->space_info.next,
					struct btrfs_space_info,
					list);

		/*
                 * Do not hide this behind enospc_debug, this is actually
                 * important and indicates a real bug if this happens.
                 */
		if (WARN_ON(space_info->bytes_pinned > 0 ||
			    space_info->bytes_reserved > 0 ||
			    space_info->bytes_may_use > 0))
			dump_space_info(info, space_info, 0, 0);
		list_del(&space_info->list);
		for (i = 0; i < BTRFS_NR_RAID_TYPES; i++) {
			struct kobject *kobj;
			kobj = space_info->block_group_kobjs[i];
			space_info->block_group_kobjs[i] = NULL;
			if (kobj) {
				kobject_del(kobj);
				kobject_put(kobj);
			}
		}
		kobject_del(&space_info->kobj);
		kobject_put(&space_info->kobj);
	}
	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
zheng yan zheng yan 208 41.27% 5 20.00%
josef bacik josef bacik 116 23.02% 10 40.00%
jeff mahoney jeff mahoney 67 13.29% 3 12.00%
chris mason chris mason 54 10.71% 3 12.00%
liu bo liu bo 46 9.13% 1 4.00%
filipe david borba manana filipe david borba manana 8 1.59% 1 4.00%
dulshani gunawardhana dulshani gunawardhana 3 0.60% 1 4.00%
david sterba david sterba 2 0.40% 1 4.00%
Total 504 100.00% 25 100.00%



static void __link_block_group(struct btrfs_space_info *space_info,
			       struct btrfs_block_group_cache *cache)
{
	int index = get_block_group_index(cache);
	bool first = false;

	down_write(&space_info->groups_sem);
	if (list_empty(&space_info->block_groups[index]))
		first = true;
	list_add_tail(&cache->list, &space_info->block_groups[index]);
	up_write(&space_info->groups_sem);

	if (first) {
		struct raid_kobject *rkobj;
		int ret;

		rkobj = kzalloc(sizeof(*rkobj), GFP_NOFS);
		if (!rkobj)
			goto out_err;
		rkobj->raid_type = index;
		kobject_init(&rkobj->kobj, &btrfs_raid_ktype);
		ret = kobject_add(&rkobj->kobj, &space_info->kobj,
				  "%s", get_raid_name(index));
		if (ret) {
			kobject_put(&rkobj->kobj);
			goto out_err;
		}
		space_info->block_group_kobjs[index] = &rkobj->kobj;
	}

	return;
out_err:
	btrfs_warn(cache->fs_info,
		   "failed to add kobject for block cache, ignoring");
}

Contributors
Person Tokens Prop Commits CommitProp
jeff mahoney jeff mahoney 160 82.90% 5 71.43%
zheng yan zheng yan 32 16.58% 1 14.29%
miao xie miao xie 1 0.52% 1 14.29%
Total 193 100.00% 7 100.00%


static struct btrfs_block_group_cache *

btrfs_create_block_group_cache(struct btrfs_fs_info *fs_info,
			       u64 start, u64 size)
{
	struct btrfs_block_group_cache *cache;

	cache = kzalloc(sizeof(*cache), GFP_NOFS);
	if (!cache)
		return NULL;

	cache->free_space_ctl = kzalloc(sizeof(*cache->free_space_ctl),
					GFP_NOFS);
	if (!cache->free_space_ctl) {
		kfree(cache);
		return NULL;
	}

	cache->key.objectid = start;
	cache->key.offset = size;
	cache->key.type = BTRFS_BLOCK_GROUP_ITEM_KEY;

	cache->sectorsize = fs_info->sectorsize;
	cache->fs_info = fs_info;
	cache->full_stripe_len = btrfs_full_stripe_len(fs_info,
						       &fs_info->mapping_tree,
						       start);
	set_free_space_tree_thresholds(cache);

	atomic_set(&cache->count, 1);
	spin_lock_init(&cache->lock);
	init_rwsem(&cache->data_rwsem);
	INIT_LIST_HEAD(&cache->list);
	INIT_LIST_HEAD(&cache->cluster_list);
	INIT_LIST_HEAD(&cache->bg_list);
	INIT_LIST_HEAD(&cache->ro_list);
	INIT_LIST_HEAD(&cache->dirty_list);
	INIT_LIST_HEAD(&cache->io_list);
	btrfs_init_free_space_ctl(cache);
	atomic_set(&cache->trimming, 0);
	mutex_init(&cache->free_space_lock);

	return cache;
}

Contributors
Person Tokens Prop Commits CommitProp
miao xie miao xie 185 77.73% 2 18.18%
josef bacik josef bacik 17 7.14% 3 27.27%
omar sandoval omar sandoval 13 5.46% 2 18.18%
filipe david borba manana filipe david borba manana 10 4.20% 1 9.09%
chris mason chris mason 8 3.36% 1 9.09%
jeff mahoney jeff mahoney 5 2.10% 2 18.18%
Total 238 100.00% 11 100.00%



int btrfs_read_block_groups(struct btrfs_fs_info *info)
{
	struct btrfs_path *path;
	int ret;
	struct btrfs_block_group_cache *cache;
	struct btrfs_space_info *space_info;
	struct btrfs_key key;
	struct btrfs_key found_key;
	struct extent_buffer *leaf;
	int need_clear = 0;
	u64 cache_gen;
	u64 feature;
	int mixed;

	feature = btrfs_super_incompat_flags(info->super_copy);
	mixed = !!(feature & BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS);

	key.objectid = 0;
	key.offset = 0;
	key.type = BTRFS_BLOCK_GROUP_ITEM_KEY;
	path = btrfs_alloc_path();
	if (!path)
		return -ENOMEM;
	path->reada = READA_FORWARD;

	cache_gen = btrfs_super_cache_generation(info->super_copy);
	if (btrfs_test_opt(info, SPACE_CACHE) &&
	    btrfs_super_generation(info->super_copy) != cache_gen)
		need_clear = 1;
	if (btrfs_test_opt(info, CLEAR_CACHE))
		need_clear = 1;

	while (1) {
		ret = find_first_block_group(info, path, &key);
		if (ret > 0)
			break;
		if (ret != 0)
			goto error;

		leaf = path->nodes[0];
		btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);

		cache = btrfs_create_block_group_cache(info, found_key.objectid,
						       found_key.offset);
		if (!cache) {
			ret = -ENOMEM;
			goto error;
		}

		if (need_clear) {
			/*
                         * When we mount with old space cache, we need to
                         * set BTRFS_DC_CLEAR and set dirty flag.
                         *
                         * a) Setting 'BTRFS_DC_CLEAR' makes sure that we
                         *    truncate the old free space cache inode and
                         *    setup a new one.
                         * b) Setting 'dirty flag' makes sure that we flush
                         *    the new space cache info onto disk.
                         */
			if (btrfs_test_opt(info, SPACE_CACHE))
				cache->disk_cache_state = BTRFS_DC_CLEAR;
		}

		read_extent_buffer(leaf, &cache->item,
				   btrfs_item_ptr_offset(leaf, path->slots[0]),
				   sizeof(cache->item));
		cache->flags = btrfs_block_group_flags(&cache->item);
		if (!mixed &&
		    ((cache->flags & BTRFS_BLOCK_GROUP_METADATA) &&
		    (cache->flags & BTRFS_BLOCK_GROUP_DATA))) {
			btrfs_err(info,
"bg %llu is a mixed block group but filesystem hasn't enabled mixed block groups",
				  cache->key.objectid);
			ret = -EINVAL;
			goto error;
		}

		key.objectid = found_key.objectid + found_key.offset;
		btrfs_release_path(path);

		/*
                 * We need to exclude the super stripes now so that the space
                 * info has super bytes accounted for, otherwise we'll think
                 * we have more space than we actually do.
                 */
		ret = exclude_super_stripes(info, cache);
		if (ret) {
			/*
                         * We may have excluded something, so call this just in
                         * case.
                         */
			free_excluded_extents(info, cache);
			btrfs_put_block_group(cache);
			goto error;
		}

		/*
                 * check for two cases, either we are full, and therefore
                 * don't need to bother with the caching work since we won't
                 * find any space, or we are empty, and we can just add all
                 * the space in and be done with it.  This saves us _alot_ of
                 * time, particularly in the full case.
                 */
		if (found_key.offset == btrfs_block_group_used(&cache->item)) {
			cache->last_byte_to_unpin = (u64)-1;
			cache->cached = BTRFS_CACHE_FINISHED;
			free_excluded_extents(info, cache);
		} else if (btrfs_block_group_used(&cache->item) == 0) {
			cache->last_byte_to_unpin = (u64)-1;
			cache->cached = BTRFS_CACHE_FINISHED;
			add_new_free_space(cache, info,
					   found_key.objectid,
					   found_key.objectid +
					   found_key.offset);
			free_excluded_extents(info, cache);
		}

		ret = btrfs_add_block_group_cache(info, cache);
		if (ret) {
			btrfs_remove_free_space_cache(cache);
			btrfs_put_block_group(cache);
			goto error;
		}

		trace_btrfs_add_block_group(info, cache, 0);
		ret = update_space_info(info, cache->flags, found_key.offset,
					btrfs_block_group_used(&cache->item),
					cache->bytes_super, &space_info);
		if (ret) {
			btrfs_remove_free_space_cache(cache);
			spin_lock(&info->block_group_cache_lock);
			rb_erase(&cache->cache_node,
				 &info->block_group_cache_tree);
			RB_CLEAR_NODE(&cache->cache_node);
			spin_unlock(&info->block_group_cache_lock);
			btrfs_put_block_group(cache);
			goto error;
		}

		cache->space_info = space_info;

		__link_block_group(space_info, cache);

		set_avail_alloc_bits(info, cache->flags);
		if (btrfs_chunk_readonly(info, cache->key.objectid)) {
			inc_block_group_ro(cache, 1);
		} else if (btrfs_block_group_used(&cache->item) == 0) {
			spin_lock(&info->unused_bgs_lock);
			/* Should always be true but just in case. */
			if (list_empty(&cache->bg_list)) {
				btrfs_get_block_group(cache);
				list_add_tail(&cache->bg_list,
					      &info->unused_bgs);
			}
			spin_unlock(&info->unused_bgs_lock);
		}
	}

	list_for_each_entry_rcu(space_info, &info->space_info, list) {
		if (!(get_alloc_profile(info, space_info->flags) &
		      (BTRFS_BLOCK_GROUP_RAID10 |
		       BTRFS_BLOCK_GROUP_RAID1 |
		       BTRFS_BLOCK_GROUP_RAID5 |
		       BTRFS_BLOCK_GROUP_RAID6 |
		       BTRFS_BLOCK_GROUP_DUP)))
			continue;
		/*
                 * avoid allocating from un-mirrored block group if there are
                 * mirrored block groups.
                 */
		list_for_each_entry(cache,
				&space_info->block_groups[BTRFS_RAID_RAID0],
				list)
			inc_block_group_ro(cache, 1);
		list_for_each_entry(cache,
				&space_info->block_groups[BTRFS_RAID_SINGLE],
				list)
			inc_block_group_ro(cache, 1);
	}

	init_global_block_rsv(info);
	ret = 0;
error:
	btrfs_free_path(path);
	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
josef bacik josef bacik 308 37.79% 14 29.79%
chris mason chris mason 241 29.57% 13 27.66%
zheng yan zheng yan 102 12.52% 5 10.64%
liu bo liu bo 86 10.55% 2 4.26%
miao xie miao xie 35 4.29% 2 4.26%
jeff mahoney jeff mahoney 20 2.45% 4 8.51%
filipe david borba manana filipe david borba manana 8 0.98% 1 2.13%
david sterba david sterba 4 0.49% 2 4.26%
david woodhouse david woodhouse 4 0.49% 1 2.13%
zhao lei zhao lei 3 0.37% 1 2.13%
li zefan li zefan 2 0.25% 1 2.13%
chandan rajendra chandan rajendra 2 0.25% 1 2.13%
Total 815 100.00% 47 100.00%



void btrfs_create_pending_block_groups(struct btrfs_trans_handle *trans,
				       struct btrfs_fs_info *fs_info)
{
	struct btrfs_block_group_cache *block_group, *tmp;
	struct btrfs_root *extent_root = fs_info->extent_root;
	struct btrfs_block_group_item item;
	struct btrfs_key key;
	int ret = 0;
	bool can_flush_pending_bgs = trans->can_flush_pending_bgs;

	trans->can_flush_pending_bgs = false;
	list_for_each_entry_safe(block_group, tmp, &trans->new_bgs, bg_list) {
		if (ret)
			goto next;

		spin_lock(&block_group->lock);
		memcpy(&item, &block_group->item, sizeof(item));
		memcpy(&key, &block_group->key, sizeof(key));
		spin_unlock(&block_group->lock);

		ret = btrfs_insert_item(trans, extent_root, &key, &item,
					sizeof(item));
		if (ret)
			btrfs_abort_transaction(trans, ret);
		ret = btrfs_finish_chunk_alloc(trans, fs_info, key.objectid,
					       key.offset);
		if (ret)
			btrfs_abort_transaction(trans, ret);
		add_block_group_free_space(trans, fs_info, block_group);
		/* already aborted the transaction if it failed. */
next:
		list_del_init(&block_group->bg_list);
	}
	trans->can_flush_pending_bgs = can_flush_pending_bgs;
}

Contributors
Person Tokens Prop Commits CommitProp
josef bacik josef bacik 161 76.67% 3 33.33%
filipe david borba manana filipe david borba manana 32 15.24% 2 22.22%
omar sandoval omar sandoval 10 4.76% 1 11.11%
jeff mahoney jeff mahoney 7 3.33% 3 33.33%
Total 210 100.00% 9 100.00%



int btrfs_make_block_group(struct btrfs_trans_handle *trans,
			   struct btrfs_fs_info *fs_info, u64 bytes_used,
			   u64 type, u64 chunk_objectid, u64 chunk_offset,
			   u64 size)
{
	struct btrfs_block_group_cache *cache;
	int ret;

	btrfs_set_log_full_commit(fs_info, trans);

	cache = btrfs_create_block_group_cache(fs_info, chunk_offset, size);
	if (!cache)
		return -ENOMEM;

	btrfs_set_block_group_used(&cache->item, bytes_used);
	btrfs_set_block_group_chunk_objectid(&cache->item, chunk_objectid);
	btrfs_set_block_group_flags(&cache->item, type);

	cache->flags = type;
	cache->last_byte_to_unpin = (u64)-1;
	cache->cached = BTRFS_CACHE_FINISHED;
	cache->needs_free_space = 1;
	ret = exclude_super_stripes(fs_info, cache);
	if (ret) {
		/*
                 * We may have excluded something, so call this just in
                 * case.
                 */
		free_excluded_extents(fs_info, cache);
		btrfs_put_block_group(cache);
		return ret;
	}

	add_new_free_space(cache, fs_info, chunk_offset, chunk_offset + size);

	free_excluded_extents(fs_info, cache);

#ifdef CONFIG_BTRFS_DEBUG
	if (btrfs_should_fragment_free_space(cache)) {
		u64 new_bytes_used = size - bytes_used;

		bytes_used += new_bytes_used >> 1;
		fragment_free_space(cache);
	}
#endif
	/*
         * Call to ensure the corresponding space_info object is created and
         * assigned to our block group, but don't update its counters just yet.
         * We want our bg to be added to the rbtree with its ->space_info set.
         */
	ret = update_space_info(fs_info, cache->flags, 0, 0, 0,
				&cache->space_info);
	if (ret) {
		btrfs_remove_free_space_cache(cache);
		btrfs_put_block_group(cache);
		return ret;
	}

	ret = btrfs_add_block_group_cache(fs_info, cache);
	if (ret) {
		btrfs_remove_free_space_cache(cache);
		btrfs_put_block_group(cache);
		return ret;
	}

	/*
         * Now that our block group has its ->space_info set and is inserted in
         * the rbtree, update the space info's counters.
         */
	trace_btrfs_add_block_group(fs_info, cache, 1);
	ret = update_space_info(fs_info, cache->flags, size, bytes_used,
				cache->bytes_super, &cache->space_info);
	if (ret) {
		btrfs_remove_free_space_cache(cache);
		spin_lock(&fs_info->block_group_cache_lock);
		rb_erase(&cache->cache_node,
			 &fs_info->block_group_cache_tree);
		RB_CLEAR_NODE(&cache->cache_node);
		spin_unlock(&fs_info->block_group_cache_lock);
		btrfs_put_block_group(cache);
		return ret;
	}
	update_global_block_rsv(fs_info);

	__link_block_group(cache->space_info, cache);

	list_add_tail(&cache->bg_list, &trans->new_bgs);

	set_avail_alloc_bits(fs_info, type);
	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
josef bacik josef bacik 173 42.93% 10 38.46%
chris mason chris mason 116 28.78% 4 15.38%
filipe david borba manana filipe david borba manana 49 12.16% 2 7.69%
zheng yan zheng yan 18 4.47% 2 7.69%
li zefan li zefan 17 4.22% 2 7.69%
miao xie miao xie 14 3.47% 2 7.69%
jeff mahoney jeff mahoney 10 2.48% 3 11.54%
omar sandoval omar sandoval 6 1.49% 1 3.85%
Total 403 100.00% 26 100.00%



static void clear_avail_alloc_bits(struct btrfs_fs_info *fs_info, u64 flags)
{
	u64 extra_flags = chunk_to_extended(flags) &
				BTRFS_EXTENDED_PROFILE_MASK;

	write_seqlock(&fs_info->profiles_lock);
	if (flags & BTRFS_BLOCK_GROUP_DATA)
		fs_info->avail_data_alloc_bits &= ~extra_flags;
	if (flags & BTRFS_BLOCK_GROUP_METADATA)
		fs_info->avail_metadata_alloc_bits &= ~extra_flags;
	if (flags & BTRFS_BLOCK_GROUP_SYSTEM)
		fs_info->avail_system_alloc_bits &= ~extra_flags;
	write_sequnlock(&fs_info->profiles_lock);
}

Contributors
Person Tokens Prop Commits CommitProp
ilya dryomov ilya dryomov 63 79.75% 2 66.67%
miao xie miao xie 16 20.25% 1 33.33%
Total 79 100.00% 3 100.00%



int btrfs_remove_block_group(struct btrfs_trans_handle *trans,
			     struct btrfs_fs_info *fs_info, u64 group_start,
			     struct extent_map *em)
{
	struct btrfs_root *root = fs_info->extent_root;
	struct btrfs_path *path;
	struct btrfs_block_group_cache *block_group;
	struct btrfs_free_cluster *cluster;
	struct btrfs_root *tree_root = fs_info->tree_root;
	struct btrfs_key key;
	struct inode *inode;
	struct kobject *kobj = NULL;
	int ret;
	int index;
	int factor;
	struct btrfs_caching_control *caching_ctl = NULL;
	bool remove_em;

	block_group = btrfs_lookup_block_group(fs_info, group_start);
	BUG_ON(!block_group);
	BUG_ON(!block_group->ro);

	/*
         * Free the reserved super bytes from this block group before
         * remove it.
         */
	free_excluded_extents(fs_info, block_group);

	memcpy(&key, &block_group->key, sizeof(key));
	index = get_block_group_index(block_group);
	if (block_group->flags & (BTRFS_BLOCK_GROUP_DUP |
				  BTRFS_BLOCK_GROUP_RAID1 |
				  BTRFS_BLOCK_GROUP_RAID10))
		factor = 2;
	else
		factor = 1;

	/* make sure this block group isn't part of an allocation cluster */
	cluster = &fs_info->data_alloc_cluster;
	spin_lock(&cluster->refill_lock);
	btrfs_return_cluster_to_free_space(block_group, cluster);
	spin_unlock(&cluster->refill_lock);

	/*
         * make sure this block group isn't part of a metadata
         * allocation cluster
         */
	cluster = &fs_info->meta_alloc_cluster;
	spin_lock(&cluster->refill_lock);
	btrfs_return_cluster_to_free_space(block_group, cluster);
	spin_unlock(&cluster->refill_lock);

	path = btrfs_alloc_path();
	if (!path) {
		ret = -ENOMEM;
		goto out;
	}

	/*
         * get the inode first so any iput calls done for the io_list
         * aren't the final iput (no unlinks allowed now)
         */
	inode = lookup_free_space_inode(tree_root, block_group, path);

	mutex_lock(&trans->transaction->cache_write_mutex);
	/*
         * make sure our free spache cache IO is done before remove the
         * free space inode
         */
	spin_lock(&trans->transaction->dirty_bgs_lock);
	if (!list_empty(&block_group->io_list)) {
		list_del_init(&block_group->io_list);

		WARN_ON(!IS_ERR(inode) && inode != block_group->io_ctl.inode);

		spin_unlock(&trans->transaction->dirty_bgs_lock);
		btrfs_wait_cache_io(trans, block_group, path);
		btrfs_put_block_group(block_group);
		spin_lock(&trans->transaction->dirty_bgs_lock);
	}

	if (!list_empty(&block_group->dirty_list)) {
		list_del_init(&block_group->dirty_list);
		btrfs_put_block_group(block_group);
	}
	spin_unlock(&trans->transaction->dirty_bgs_lock);
	mutex_unlock(&trans->transaction->cache_write_mutex);

	if (!IS_ERR(inode)) {
		ret = btrfs_orphan_add(trans, inode);
		if (ret) {
			btrfs_add_delayed_iput(inode);
			goto out;
		}
		clear_nlink(inode);
		/* One for the block groups ref */
		spin_lock(&block_group->lock);
		if (block_group->iref) {
			block_group->iref = 0;
			block_group->inode = NULL;
			spin_unlock(&block_group->lock);
			iput(inode);
		} else {
			spin_unlock(&block_group->lock);
		}
		/* One for our lookup ref */
		btrfs_add_delayed_iput(inode);
	}

	key.objectid = BTRFS_FREE_SPACE_OBJECTID;
	key.offset = block_group->key.objectid;
	key.type = 0;

	ret = btrfs_search_slot(trans, tree_root, &key, path, -1, 1);
	if (ret < 0)
		goto out;
	if (ret > 0)
		btrfs_release_path(path);
	if (ret == 0) {
		ret = btrfs_del_item(trans, tree_root, path);
		if (ret)
			goto out;
		btrfs_release_path(path);
	}

	spin_lock(&fs_info->block_group_cache_lock);
	rb_erase(&block_group->cache_node,
		 &fs_info->block_group_cache_tree);
	RB_CLEAR_NODE(&block_group->cache_node);

	if (fs_info->first_logical_byte == block_group->key.objectid)
		fs_info->first_logical_byte = (u64)-1;
	spin_unlock(&fs_info->block_group_cache_lock);

	down_write(&block_group->space_info->groups_sem);
	/*
         * we must use list_del_init so people can check to see if they
         * are still on the list after taking the semaphore
         */
	list_del_init(&block_group->list);
	if (list_empty(&block_group->space_info->block_groups[index])) {
		kobj = block_group->space_info->block_group_kobjs[index];
		block_group->space_info->block_group_kobjs[index] = NULL;
		clear_avail_alloc_bits(fs_info, block_group->flags);
	}
	up_write(&block_group->space_info->groups_sem);
	if (kobj) {
		kobject_del(kobj);
		kobject_put(kobj);
	}

	if (block_group->has_caching_ctl)
		caching_ctl = get_caching_control(block_group);
	if (block_group->cached == BTRFS_CACHE_STARTED)
		wait_block_group_cache_done(block_group);
	if (block_group->has_caching_ctl) {
		down_write(&fs_info->commit_root_sem);
		if (!caching_ctl) {
			struct btrfs_caching_control *ctl;

			list_for_each_entry(ctl,
				    &fs_info->caching_block_groups, list)
				if (ctl->block_group == block_group) {
					caching_ctl = ctl;
					atomic_inc(&caching_ctl->count);
					break;
				}
		}
		if (caching_ctl)
			list_del_init(&caching_ctl->list);
		up_write(&fs_info->commit_root_sem);
		if (caching_ctl) {
			/* Once for the caching bgs list and once for us. */
			put_caching_control(caching_ctl);
			put_caching_control(caching_ctl);
		}
	}

	spin_lock(&trans->transaction->dirty_bgs_lock);
	if (!list_empty(&block_group->dirty_list)) {
		WARN_ON(1);
	}
	if (!list_empty(&block_group->io_list)) {
		WARN_ON(1);
	}
	spin_unlock(&trans->transaction->dirty_bgs_lock);
	btrfs_remove_free_space_cache(block_group);

	spin_lock(&block_group->space_info->lock);
	list_del_init(&block_group->ro_list);

	if (btrfs_test_opt(fs_info, ENOSPC_DEBUG)) {
		WARN_ON(block_group->space_info->total_bytes
			< block_group->key.offset);
		WARN_ON(block_group->space_info->bytes_readonly
			< block_group->key.offset);
		WARN_ON(block_group->space_info->disk_total
			< block_group->key.offset * factor);
	}
	block_group->space_info->total_bytes -= block_group->key.offset;
	block_group->space_info->bytes_readonly -= block_group->key.offset;
	block_group->space_info->disk_total -= block_group->key.offset * factor;

	spin_unlock(&block_group->space_info->lock);

	memcpy(&key, &block_group->key, sizeof(key));

	mutex_lock(&fs_info->chunk_mutex);
	if (!list_empty(&em->list)) {
		/* We're in the transaction->pending_chunks list. */
		free_extent_map(em);
	}
	spin_lock(&block_group->lock);
	block_group->removed = 1;
	/*
         * At this point trimming can't start on this block group, because we
         * removed the block group from the tree fs_info->block_group_cache_tree
         * so no one can't find it anymore and even if someone already got this
         * block group before we removed it from the rbtree, they have already
         * incremented block_group->trimming - if they didn't, they won't find
         * any free space entries because we already removed them all when we
         * called btrfs_remove_free_space_cache().
         *
         * And we must not remove the extent map from the fs_info->mapping_tree
         * to prevent the same logical address range and physical device space
         * ranges from being reused for a new block group. This is because our
         * fs trim operation (btrfs_trim_fs() / btrfs_ioctl_fitrim()) is
         * completely transactionless, so while it is trimming a range the
         * currently running transaction might finish and a new one start,
         * allowing for new block groups to be created that can reuse the same
         * physical device locations unless we take this special care.
         *
         * There may also be an implicit trim operation if the file system
         * is mounted with -odiscard. The same protections must remain
         * in place until the extents have been discarded completely when
         * the transaction commit has completed.
         */
	remove_em = (atomic_read(&block_group->trimming) == 0);
	/*
         * Make sure a trimmer task always sees the em in the pinned_chunks list
         * if it sees block_group->removed == 1 (needs to lock block_group->lock
         * before checking block_group->removed).
         */
	if (!remove_em) {
		/*
                 * Our em might be in trans->transaction->pending_chunks which
                 * is protected by fs_info->chunk_mutex ([lock|unlock]_chunks),
                 * and so is the fs_info->pinned_chunks list.
                 *
                 * So at this point we must be holding the chunk_mutex to avoid
                 * any races with chunk allocation (more specifically at
                 * volumes.c:contains_pending_extent()), to ensure it always
                 * sees the em, either in the pending_chunks list or in the
                 * pinned_chunks list.
                 */
		list_move_tail(&em->list, &fs_info->pinned_chunks);
	}
	spin_unlock(&block_group->lock);

	if (remove_em) {
		struct extent_map_tree *em_tree;

		em_tree = &fs_info->mapping_tree.map_tree;
		write_lock(&em_tree->lock);
		/*
                 * The em might be in the pending_chunks list, so make sure the
                 * chunk mutex is locked, since remove_extent_mapping() will
                 * delete us from that list.
                 */
		remove_extent_mapping(em_tree, em);
		write_unlock(&em_tree->lock);
		/* once for the tree */
		free_extent_map(em);
	}

	mutex_unlock(&fs_info->chunk_mutex);

	ret = remove_block_group_free_space(trans, fs_info, block_group);
	if (ret)
		goto out;

	btrfs_put_block_group(block_group);
	btrfs_put_block_group(block_group);

	ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
	if (ret > 0)
		ret = -EIO;
	if (ret < 0)
		goto out;

	ret = btrfs_del_item(trans, root, path);
out:
	btrfs_free_path(path);
	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
josef bacik josef bacik 315 24.29% 6 15.79%
filipe david borba manana filipe david borba manana 272 20.97% 6 15.79%
zheng yan zheng yan 245 18.89% 5 13.16%
chris mason chris mason 226 17.42% 3 7.89%
jeff mahoney jeff mahoney 75 5.78% 9 23.68%
zhao lei zhao lei 57 4.39% 1 2.63%
ilya dryomov ilya dryomov 35 2.70% 2 5.26%
liu bo liu bo 29 2.24% 2 5.26%
omar sandoval omar sandoval 18 1.39% 1 2.63%
mark fasheh mark fasheh 12 0.93% 1 2.63%
david sterba david sterba 8 0.62% 1 2.63%
tsutomu itoh tsutomu itoh 5 0.39% 1 2.63%
Total 1297 100.00% 38 100.00%


struct btrfs_trans_handle *

btrfs_start_trans_remove_block_group(struct btrfs_fs_info *fs_info,
				     const u64 chunk_offset)
{
	struct extent_map_tree *em_tree = &fs_info->mapping_tree.map_tree;
	struct extent_map *em;
	struct map_lookup *map;
	unsigned int num_items;

	read_lock(&em_tree->lock);
	em = lookup_extent_mapping(em_tree, chunk_offset, 1);
	read_unlock(&em_tree->lock);
	ASSERT(em && em->start == chunk_offset);

	/*
         * We need to reserve 3 + N units from the metadata space info in order
         * to remove a block group (done at btrfs_remove_chunk() and at
         * btrfs_remove_block_group()), which are used for:
         *
         * 1 unit for adding the free space inode's orphan (located in the tree
         * of tree roots).
         * 1 unit for deleting the block group item (located in the extent
         * tree).
         * 1 unit for deleting the free space item (located in tree of tree
         * roots).
         * N units for deleting N device extent items corresponding to each
         * stripe (located in the device tree).
         *
         * In order to remove a block group we also need to reserve units in the
         * system space info in order to update the chunk tree (update one or
         * more device items and remove one chunk item), but this is done at
         * btrfs_remove_chunk() through a call to check_system_chunk().
         */
	map = em->map_lookup;
	num_items = 3 + map->num_stripes;
	free_extent_map(em);

	return btrfs_start_transaction_fallback_global_rsv(fs_info->extent_root,
							   num_items, 1);
}

Contributors
Person Tokens Prop Commits CommitProp
filipe david borba manana filipe david borba manana 111 99.11% 2 66.67%
jeff mahoney jeff mahoney 1 0.89% 1 33.33%
Total 112 100.00% 3 100.00%

/*
 * Process the unused_bgs list and remove any that don't have any allocated
 * space inside of them.
 */


void btrfs_delete_unused_bgs(struct btrfs_fs_info *fs_info)
{
	struct btrfs_block_group_cache *block_group;
	struct btrfs_space_info *space_info;
	struct btrfs_trans_handle *trans;
	int ret = 0;

	if (!test_bit(BTRFS_FS_OPEN, &fs_info->flags))
		return;

	spin_lock(&fs_info->unused_bgs_lock);
	while (!list_empty(&fs_info->unused_bgs)) {
		u64 start, end;
		int trimming;

		block_group = list_first_entry(&fs_info->unused_bgs,
					       struct btrfs_block_group_cache,
					       bg_list);
		list_del_init(&block_group->bg_list);

		space_info = block_group->space_info;

		if (ret || btrfs_mixed_space_info(space_info)) {
			btrfs_put_block_group(block_group);
			continue;
		}
		spin_unlock(&fs_info->unused_bgs_lock);

		mutex_lock(&fs_info->delete_unused_bgs_mutex);

		/* Don't want to race with allocators so take the groups_sem */
		down_write(&space_info->groups_sem);
		spin_lock(&block_group->lock);
		if (block_group->reserved ||
		    btrfs_block_group_used(&block_group->item) ||
		    block_group->ro ||
		    list_is_singular(&block_group->list)) {
			/*
                         * We want to bail if we made new allocations or have
                         * outstanding allocations in this block group.  We do
                         * the ro check in case balance is currently acting on
                         * this block group.
                         */
			spin_unlock(&block_group->lock);
			up_write(&space_info->groups_sem);
			goto next;
		}
		spin_unlock(&block_group->lock);

		/* We don't want to force the issue, only flip if it's ok. */
		ret = inc_block_group_ro(block_group, 0);
		up_write(&space_info->groups_sem);
		if (ret < 0) {
			ret = 0;
			goto next;
		}

		/*
                 * Want to do this before we do anything else so we can recover
                 * properly if we fail to join the transaction.
                 */
		trans = btrfs_start_trans_remove_block_group(fs_info,
						     block_group->key.objectid);
		if (IS_ERR(trans)) {
			btrfs_dec_block_group_ro(block_group);
			ret = PTR_ERR(trans);
			goto next;
		}

		/*
                 * We could have pending pinned extents for this block group,
                 * just delete them, we don't care about them anymore.
                 */
		start = block_group->key.objectid;
		end = start + block_group->key.offset - 1;
		/*
                 * Hold the unused_bg_unpin_mutex lock to avoid racing with
                 * btrfs_finish_extent_commit(). If we are at transaction N,
                 * another task might be running finish_extent_commit() for the
                 * previous transaction N - 1, and have seen a range belonging
                 * to the block group in freed_extents[] before we were able to
                 * clear the whole block group range from freed_extents[]. This
                 * means that task can lookup for the block group after we
                 * unpinned it from freed_extents[] and removed it, leading to
                 * a BUG_ON() at btrfs_unpin_extent_range().
                 */
		mutex_lock(&fs_info->unused_bg_unpin_mutex);
		ret = clear_extent_bits(&fs_info->freed_extents[0], start, end,
				  EXTENT_DIRTY);
		if (ret) {
			mutex_unlock(&fs_info->unused_bg_unpin_mutex);
			btrfs_dec_block_group_ro(block_group);
			goto end_trans;
		}
		ret = clear_extent_bits(&fs_info->freed_extents[1], start, end,
				  EXTENT_DIRTY);
		if (ret) {
			mutex_unlock(&fs_info->unused_bg_unpin_mutex);
			btrfs_dec_block_group_ro(block_group);
			goto end_trans;
		}
		mutex_unlock(&fs_info->unused_bg_unpin_mutex);

		/* Reset pinned so btrfs_put_block_group doesn't complain */
		spin_lock(&space_info->lock);
		spin_lock(&block_group->lock);

		space_info->bytes_pinned -= block_group->pinned;
		space_info->bytes_readonly += block_group->pinned;
		percpu_counter_add(&space_info->total_bytes_pinned,
				   -block_group->pinned);
		block_group->pinned = 0;

		spin_unlock(&block_group->lock);
		spin_unlock(&space_info->lock);

		/* DISCARD can flip during remount */
		trimming = btrfs_test_opt(fs_info, DISCARD);

		/* Implicit trim during transaction commit. */
		if (trimming)
			btrfs_get_block_group_trimming(block_group);

		/*
                 * Btrfs_remove_chunk will abort the transaction if things go
                 * horribly wrong.
                 */
		ret = btrfs_remove_chunk(trans, fs_info,
					 block_group->key.objectid);

		if (ret) {
			if (trimming)
				btrfs_put_block_group_trimming(block_group);
			goto end_trans;
		}

		/*
                 * If we're not mounted with -odiscard, we can just forget
                 * about this block group. Otherwise we'll need to wait
                 * until transaction commit to do the actual discard.
                 */
		if (trimming) {
			spin_lock(&fs_info->unused_bgs_lock);
			/*
                         * A concurrent scrub might have added us to the list
                         * fs_info->unused_bgs, so use a list_move operation
                         * to add the block group to the deleted_bgs list.
                         */
			list_move(&block_group->bg_list,
				  &trans->transaction->deleted_bgs);
			spin_unlock(&fs_info->unused_bgs_lock);
			btrfs_get_block_group(block_group);
		}
end_trans:
		btrfs_end_transaction(trans);
next:
		mutex_unlock(&fs_info->delete_unused_bgs_mutex);
		btrfs_put_block_group(block_group);
		spin_lock(&fs_info->unused_bgs_lock);
	}
	spin_unlock(&fs_info->unused_bgs_lock);
}

Contributors
Person Tokens Prop Commits CommitProp
josef bacik josef bacik 349 57.88% 2 14.29%
filipe david borba manana filipe david borba manana 94 15.59% 6 42.86%
jeff mahoney jeff mahoney 81 13.43% 3 21.43%
zhao lei zhao lei 79 13.10% 3 21.43%
Total 603 100.00% 14 100.00%



int btrfs_init_space_info(struct btrfs_fs_info *fs_info)
{
	struct btrfs_space_info *space_info;
	struct btrfs_super_block *disk_super;
	u64 features;
	u64 flags;
	int mixed = 0;
	int ret;

	disk_super = fs_info->super_copy;
	if (!btrfs_super_root(disk_super))
		return -EINVAL;

	features = btrfs_super_incompat_flags(disk_super);
	if (features & BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS)
		mixed = 1;

	flags = BTRFS_BLOCK_GROUP_SYSTEM;
	ret = update_space_info(fs_info, flags, 0, 0, 0, &space_info);
	if (ret)
		goto out;

	if (mixed) {
		flags = BTRFS_BLOCK_GROUP_METADATA | BTRFS_BLOCK_GROUP_DATA;
		ret = update_space_info(fs_info, flags, 0, 0, 0, &space_info);
	} else {
		flags = BTRFS_BLOCK_GROUP_METADATA;
		ret = update_space_info(fs_info, flags, 0, 0, 0, &space_info);
		if (ret)
			goto out;

		flags = BTRFS_BLOCK_GROUP_DATA;
		ret = update_space_info(fs_info, flags, 0, 0, 0, &space_info);
	}
out:
	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
liu bo liu bo 177 94.65% 2 50.00%
josef bacik josef bacik 8 4.28% 1 25.00%
dan carpenter dan carpenter 2 1.07% 1 25.00%
Total 187 100.00% 4 100.00%



int btrfs_error_unpin_extent_range(struct btrfs_fs_info *fs_info,
				   u64 start, u64 end)
{
	return unpin_extent_range(fs_info, start, end, false);
}

Contributors
Person Tokens Prop Commits CommitProp
liu bo liu bo 23 82.14% 1 33.33%
jeff mahoney jeff mahoney 3 10.71% 1 33.33%
filipe david borba manana filipe david borba manana 2 7.14% 1 33.33%
Total 28 100.00% 3 100.00%

/*
 * It used to be that old block groups would be left around forever.
 * Iterating over them would be enough to trim unused space.  Since we
 * now automatically remove them, we also need to iterate over unallocated
 * space.
 *
 * We don't want a transaction for this since the discard may take a
 * substantial amount of time.  We don't require that a transaction be
 * running, but we do need to take a running transaction into account
 * to ensure that we're not discarding chunks that were released in
 * the current transaction.
 *
 * Holding the chunks lock will prevent other threads from allocating
 * or releasing chunks, but it won't prevent a running transaction
 * from committing and releasing the memory that the pending chunks
 * list head uses.  For that, we need to take a reference to the
 * transaction.
 */


static int btrfs_trim_free_extents(struct btrfs_device *device,
				   u64 minlen, u64 *trimmed)
{
	u64 start = 0, len = 0;
	int ret;

	*trimmed = 0;

	/* Not writeable = nothing to do. */
	if (!device->writeable)
		return 0;

	/* No free space = nothing to do. */
	if (device->total_bytes <= device->bytes_used)
		return 0;

	ret = 0;

	while (1) {
		struct btrfs_fs_info *fs_info = device->fs_info;
		struct btrfs_transaction *trans;
		u64 bytes;

		ret = mutex_lock_interruptible(&fs_info->chunk_mutex);
		if (ret)
			return ret;

		down_read(&fs_info->commit_root_sem);

		spin_lock(&fs_info->trans_lock);
		trans = fs_info->running_transaction;
		if (trans)
			atomic_inc(&trans->use_count);
		spin_unlock(&fs_info->trans_lock);

		ret = find_free_dev_extent_start(trans, device, minlen, start,
						 &start, &len);
		if (trans)
			btrfs_put_transaction(trans);

		if (ret) {
			up_read(&fs_info->commit_root_sem);
			mutex_unlock(&fs_info->chunk_mutex);
			if (ret == -ENOSPC)
				ret = 0;
			break;
		}

		ret = btrfs_issue_discard(device->bdev, start, len, &bytes);
		up_read(&fs_info->commit_root_sem);
		mutex_unlock(&fs_info->chunk_mutex);

		if (ret)
			break;

		start += len;
		*trimmed += bytes;

		if (fatal_signal_pending(current)) {
			ret = -ERESTARTSYS;
			break;
		}

		cond_resched();
	}

	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
jeff mahoney jeff mahoney 275 100.00% 1 100.00%
Total 275 100.00% 1 100.00%



int btrfs_trim_fs(struct btrfs_fs_info *fs_info, struct fstrim_range *range)
{
	struct btrfs_block_group_cache *cache = NULL;
	struct btrfs_device *device;
	struct list_head *devices;
	u64 group_trimmed;
	u64 start;
	u64 end;
	u64 trimmed = 0;
	u64 total_bytes = btrfs_super_total_bytes(fs_info->super_copy);
	int ret = 0;

	/*
         * try to trim all FS space, our block group may start from non-zero.
         */
	if (range->len == total_bytes)
		cache = btrfs_lookup_first_block_group(fs_info, range->start);
	else
		cache = btrfs_lookup_block_group(fs_info, range->start);

	while (cache) {
		if (cache->key.objectid >= (range->start + range->len)) {
			btrfs_put_block_group(cache);
			break;
		}

		start = max(range->start, cache->key.objectid);
		end = min(range->start + range->len,
				cache->key.objectid + cache->key.offset);

		if (end - start >= range->minlen) {
			if (!block_group_cache_done(cache)) {
				ret = cache_block_group(cache, 0);
				if (ret) {
					btrfs_put_block_group(cache);
					break;
				}
				ret = wait_block_group_cache_done(cache);
				if (ret) {
					btrfs_put_block_group(cache);
					break;
				}
			}
			ret = btrfs_trim_block_group(cache,
						     &group_trimmed,
						     start,
						     end,
						     range->minlen);

			trimmed += group_trimmed;
			if (ret) {
				btrfs_put_block_group(cache);
				break;
			}
		}

		cache = next_block_group(fs_info, cache);
	}

	mutex_lock(&fs_info->fs_devices->device_list_mutex);
	devices = &fs_info->fs_devices->alloc_list;
	list_for_each_entry(device, devices, dev_alloc_list) {
		ret = btrfs_trim_free_extents(device, range->minlen,
					      &group_trimmed);
		if (ret)
			break;

		trimmed += group_trimmed;
	}
	mutex_unlock(&fs_info->fs_devices->device_list_mutex);

	range->len = trimmed;
	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
li dongyang li dongyang 214 62.76% 1 20.00%
jeff mahoney jeff mahoney 74 21.70% 2 40.00%
liu bo liu bo 31 9.09% 1 20.00%
josef bacik josef bacik 22 6.45% 1 20.00%
Total 341 100.00% 5 100.00%

/*
 * btrfs_{start,end}_write_no_snapshoting() are similar to
 * mnt_{want,drop}_write(), they are used to prevent some tasks from writing
 * data into the page cache through nocow before the subvolume is snapshoted,
 * but flush the data into disk after the snapshot creation, or to prevent
 * operations while snapshoting is ongoing and that cause the snapshot to be
 * inconsistent (writes followed by expanding truncates for example).
 */


void btrfs_end_write_no_snapshoting(struct btrfs_root *root)
{
	percpu_counter_dec(&root->subv_writers->counter);
	/*
         * Make sure counter is updated before we wake up waiters.
         */
	smp_mb();
	if (waitqueue_active(&root->subv_writers->wait))
		wake_up(&root->subv_writers->wait);
}

Contributors
Person Tokens Prop Commits CommitProp
miao xie miao xie 44 95.65% 1 33.33%
david sterba david sterba 1 2.17% 1 33.33%
filipe david borba manana filipe david borba manana 1 2.17% 1 33.33%
Total 46 100.00% 3 100.00%



int btrfs_start_write_no_snapshoting(struct btrfs_root *root)
{
	if (atomic_read(&root->will_be_snapshoted))
		return 0;

	percpu_counter_inc(&root->subv_writers->counter);
	/*
         * Make sure counter is updated before we check for snapshot creation.
         */
	smp_mb();
	if (atomic_read(&root->will_be_snapshoted)) {
		btrfs_end_write_no_snapshoting(root);
		return 0;
	}
	return 1;
}

Contributors
Person Tokens Prop Commits CommitProp
miao xie miao xie 58 96.67% 1 50.00%
filipe david borba manana filipe david borba manana 2 3.33% 1 50.00%
Total 60 100.00% 2 100.00%



static int wait_snapshoting_atomic_t(atomic_t *a)
{
	schedule();
	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
zhao lei zhao lei 16 100.00% 1 100.00%
Total 16 100.00% 1 100.00%



void btrfs_wait_for_snapshot_creation(struct btrfs_root *root)
{
	while (true) {
		int ret;

		ret = btrfs_start_write_no_snapshoting(root);
		if (ret)
			break;
		wait_on_atomic_t(&root->will_be_snapshoted,
				 wait_snapshoting_atomic_t,
				 TASK_UNINTERRUPTIBLE);
	}
}
Contributors
Person Tokens Prop Commits CommitProp
zhao lei zhao lei 43 100.00% 1 100.00%
Total 43 100.00% 1 100.00%

Overall Contributors
Person Tokens Prop Commits CommitProp
zheng yan zheng yan 18150 37.76% 47 6.71%
josef bacik josef bacik 13221 27.51% 191 27.29%
chris mason chris mason 5195 10.81% 133 19.00%
jeff mahoney jeff mahoney 2756 5.73% 36 5.14%
miao xie miao xie 1977 4.11% 53 7.57%
filipe david borba manana filipe david borba manana 1950 4.06% 48 6.86%
liu bo liu bo 1152 2.40% 35 5.00%
qu wenruo qu wenruo 519 1.08% 14 2.00%
ilya dryomov ilya dryomov 376 0.78% 11 1.57%
zhao lei zhao lei 362 0.75% 14 2.00%
omar sandoval omar sandoval 320 0.67% 4 0.57%
arne jansen arne jansen 292 0.61% 6 0.86%
wang xiaoguang wang xiaoguang 286 0.60% 10 1.43%
li dongyang li dongyang 269 0.56% 2 0.29%
david sterba david sterba 243 0.51% 23 3.29%
wang shilong wang shilong 145 0.30% 4 0.57%
mark fasheh mark fasheh 130 0.27% 4 0.57%
alexandre oliva alexandre oliva 117 0.24% 5 0.71%
david woodhouse david woodhouse 96 0.20% 2 0.29%
tsutomu itoh tsutomu itoh 76 0.16% 5 0.71%
simon kirby simon kirby 57 0.12% 1 0.14%
li zefan li zefan 56 0.12% 4 0.57%
yan zheng yan zheng 41 0.09% 4 0.57%
stefan behrens stefan behrens 40 0.08% 4 0.57%
geert uytterhoeven geert uytterhoeven 34 0.07% 1 0.14%
shaohua li shaohua li 28 0.06% 1 0.14%
liu hui liu hui 25 0.05% 1 0.14%
chandan rajendra chandan rajendra 25 0.05% 2 0.29%
wubo wubo 17 0.04% 1 0.14%
jan schmidt jan schmidt 15 0.03% 4 0.57%
nicholas d steeves nicholas d steeves 13 0.03% 1 0.14%
byongho lee byongho lee 12 0.02% 1 0.14%
dulshani gunawardhana dulshani gunawardhana 9 0.02% 1 0.14%
christoph hellwig christoph hellwig 6 0.01% 4 0.57%
alexandru moise alexandru moise 6 0.01% 1 0.14%
zach brown zach brown 5 0.01% 2 0.29%
tejun heo tejun heo 5 0.01% 2 0.29%
alex lyakas alex lyakas 4 0.01% 1 0.14%
julia lawall julia lawall 3 0.01% 1 0.14%
adam borowski adam borowski 3 0.01% 1 0.14%
eric sandeen eric sandeen 3 0.01% 1 0.14%
daniel dressler daniel dressler 3 0.01% 1 0.14%
qinghuang feng qinghuang feng 3 0.01% 1 0.14%
dongsheng yang dongsheng yang 3 0.01% 2 0.29%
anand jain anand jain 3 0.01% 2 0.29%
masahiro yamada masahiro yamada 2 0.00% 1 0.14%
sudip mukherjee sudip mukherjee 2 0.00% 1 0.14%
dan carpenter dan carpenter 2 0.00% 1 0.14%
kirill a. shutemov kirill a. shutemov 2 0.00% 1 0.14%
miguel filipe miguel filipe 2 0.00% 1 0.14%
frank holton frank holton 1 0.00% 1 0.14%
goldwyn rodrigues goldwyn rodrigues 1 0.00% 1 0.14%
sankar p sankar p 1 0.00% 1 0.14%
Total 48064 100.00% 700 100.00%
Directory: fs/btrfs

Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
	Person	Tokens	Prop	Commits	CommitProp
josef bacik	josef bacik	28	100.00%	2	100.00%
	Total	28	100.00%	2	100.00%
cregit-Linux how code gets into the kernel

Release 4.10 fs/btrfs/extent-tree.c

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