Release 4.10 fs/btrfs/transaction.c

/*
 * 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/fs.h>
#include <linux/slab.h>
#include <linux/sched.h>
#include <linux/writeback.h>
#include <linux/pagemap.h>
#include <linux/blkdev.h>
#include <linux/uuid.h>
#include "ctree.h"
#include "disk-io.h"
#include "transaction.h"
#include "locking.h"
#include "tree-log.h"
#include "inode-map.h"
#include "volumes.h"
#include "dev-replace.h"
#include "qgroup.h"


#define BTRFS_ROOT_TRANS_TAG 0


static const unsigned int btrfs_blocked_trans_types[TRANS_STATE_MAX] = {
	[TRANS_STATE_RUNNING]		= 0U,
	[TRANS_STATE_BLOCKED]		= (__TRANS_USERSPACE |
					   __TRANS_START),
	[TRANS_STATE_COMMIT_START]	= (__TRANS_USERSPACE |
					   __TRANS_START |
					   __TRANS_ATTACH),
	[TRANS_STATE_COMMIT_DOING]	= (__TRANS_USERSPACE |
					   __TRANS_START |
					   __TRANS_ATTACH |
					   __TRANS_JOIN),
	[TRANS_STATE_UNBLOCKED]		= (__TRANS_USERSPACE |
					   __TRANS_START |
					   __TRANS_ATTACH |
					   __TRANS_JOIN |
					   __TRANS_JOIN_NOLOCK),
	[TRANS_STATE_COMPLETED]		= (__TRANS_USERSPACE |
					   __TRANS_START |
					   __TRANS_ATTACH |
					   __TRANS_JOIN |
					   __TRANS_JOIN_NOLOCK),
};



void btrfs_put_transaction(struct btrfs_transaction *transaction)
{
	WARN_ON(atomic_read(&transaction->use_count) == 0);
	if (atomic_dec_and_test(&transaction->use_count)) {
		BUG_ON(!list_empty(&transaction->list));
		WARN_ON(!RB_EMPTY_ROOT(&transaction->delayed_refs.href_root));
		if (transaction->delayed_refs.pending_csums)
			btrfs_err(transaction->fs_info,
				  "pending csums is %llu",
				  transaction->delayed_refs.pending_csums);
		while (!list_empty(&transaction->pending_chunks)) {
			struct extent_map *em;

			em = list_first_entry(&transaction->pending_chunks,
					      struct extent_map, list);
			list_del_init(&em->list);
			free_extent_map(em);
		}
		/*
                 * If any block groups are found in ->deleted_bgs then it's
                 * because the transaction was aborted and a commit did not
                 * happen (things failed before writing the new superblock
                 * and calling btrfs_finish_extent_commit()), so we can not
                 * discard the physical locations of the block groups.
                 */
		while (!list_empty(&transaction->deleted_bgs)) {
			struct btrfs_block_group_cache *cache;

			cache = list_first_entry(&transaction->deleted_bgs,
						 struct btrfs_block_group_cache,
						 bg_list);
			list_del_init(&cache->bg_list);
			btrfs_put_block_group_trimming(cache);
			btrfs_put_block_group(cache);
		}
		kmem_cache_free(btrfs_transaction_cachep, transaction);
	}
}

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filipe david borba manana
52
27.51%
1
7.69%
chris mason
chris mason
33
17.46%
4
30.77%
arne jansen
arne jansen
8
4.23%
1
7.69%
liu bo
liu bo
6
3.17%
1
7.69%
jeff mahoney
jeff mahoney
6
3.17%
1
7.69%
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189
100.00%
13
100.00%



static void clear_btree_io_tree(struct extent_io_tree *tree)
{
	spin_lock(&tree->lock);
	/*
         * Do a single barrier for the waitqueue_active check here, the state
         * of the waitqueue should not change once clear_btree_io_tree is
         * called.
         */
	smp_mb();
	while (!RB_EMPTY_ROOT(&tree->state)) {
		struct rb_node *node;
		struct extent_state *state;

		node = rb_first(&tree->state);
		state = rb_entry(node, struct extent_state, rb_node);
		rb_erase(&state->rb_node, &tree->state);
		RB_CLEAR_NODE(&state->rb_node);
		/*
                 * btree io trees aren't supposed to have tasks waiting for
                 * changes in the flags of extent states ever.
                 */
		ASSERT(!waitqueue_active(&state->wq));
		free_extent_state(state);

		cond_resched_lock(&tree->lock);
	}
	spin_unlock(&tree->lock);
}

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filipe david borba manana
118
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david sterba
5
4.07%
2
66.67%
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3
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static noinline void switch_commit_roots(struct btrfs_transaction *trans,
					 struct btrfs_fs_info *fs_info)
{
	struct btrfs_root *root, *tmp;

	down_write(&fs_info->commit_root_sem);
	list_for_each_entry_safe(root, tmp, &trans->switch_commits,
				 dirty_list) {
		list_del_init(&root->dirty_list);
		free_extent_buffer(root->commit_root);
		root->commit_root = btrfs_root_node(root);
		if (is_fstree(root->objectid))
			btrfs_unpin_free_ino(root);
		clear_btree_io_tree(&root->dirty_log_pages);
	}

	/* We can free old roots now. */
	spin_lock(&trans->dropped_roots_lock);
	while (!list_empty(&trans->dropped_roots)) {
		root = list_first_entry(&trans->dropped_roots,
					struct btrfs_root, root_list);
		list_del_init(&root->root_list);
		spin_unlock(&trans->dropped_roots_lock);
		btrfs_drop_and_free_fs_root(fs_info, root);
		spin_lock(&trans->dropped_roots_lock);
	}
	spin_unlock(&trans->dropped_roots_lock);
	up_write(&fs_info->commit_root_sem);
}

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8
4.57%
1
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static inline void extwriter_counter_inc(struct btrfs_transaction *trans,
					 unsigned int type)
{
	if (type & TRANS_EXTWRITERS)
		atomic_inc(&trans->num_extwriters);
}

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static inline void extwriter_counter_dec(struct btrfs_transaction *trans,
					 unsigned int type)
{
	if (type & TRANS_EXTWRITERS)
		atomic_dec(&trans->num_extwriters);
}

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static inline void extwriter_counter_init(struct btrfs_transaction *trans,
					  unsigned int type)
{
	atomic_set(&trans->num_extwriters, ((type & TRANS_EXTWRITERS) ? 1 : 0));
}

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static inline int extwriter_counter_read(struct btrfs_transaction *trans)
{
	return atomic_read(&trans->num_extwriters);
}

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/*
 * either allocate a new transaction or hop into the existing one
 */


static noinline int join_transaction(struct btrfs_fs_info *fs_info,
				     unsigned int type)
{
	struct btrfs_transaction *cur_trans;

	spin_lock(&fs_info->trans_lock);
loop:
	/* The file system has been taken offline. No new transactions. */
	if (test_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state)) {
		spin_unlock(&fs_info->trans_lock);
		return -EROFS;
	}

	cur_trans = fs_info->running_transaction;
	if (cur_trans) {
		if (cur_trans->aborted) {
			spin_unlock(&fs_info->trans_lock);
			return cur_trans->aborted;
		}
		if (btrfs_blocked_trans_types[cur_trans->state] & type) {
			spin_unlock(&fs_info->trans_lock);
			return -EBUSY;
		}
		atomic_inc(&cur_trans->use_count);
		atomic_inc(&cur_trans->num_writers);
		extwriter_counter_inc(cur_trans, type);
		spin_unlock(&fs_info->trans_lock);
		return 0;
	}
	spin_unlock(&fs_info->trans_lock);

	/*
         * If we are ATTACH, we just want to catch the current transaction,
         * and commit it. If there is no transaction, just return ENOENT.
         */
	if (type == TRANS_ATTACH)
		return -ENOENT;

	/*
         * JOIN_NOLOCK only happens during the transaction commit, so
         * it is impossible that ->running_transaction is NULL
         */
	BUG_ON(type == TRANS_JOIN_NOLOCK);

	cur_trans = kmem_cache_alloc(btrfs_transaction_cachep, GFP_NOFS);
	if (!cur_trans)
		return -ENOMEM;

	spin_lock(&fs_info->trans_lock);
	if (fs_info->running_transaction) {
		/*
                 * someone started a transaction after we unlocked.  Make sure
                 * to redo the checks above
                 */
		kmem_cache_free(btrfs_transaction_cachep, cur_trans);
		goto loop;
	} else if (test_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state)) {
		spin_unlock(&fs_info->trans_lock);
		kmem_cache_free(btrfs_transaction_cachep, cur_trans);
		return -EROFS;
	}

	cur_trans->fs_info = fs_info;
	atomic_set(&cur_trans->num_writers, 1);
	extwriter_counter_init(cur_trans, type);
	init_waitqueue_head(&cur_trans->writer_wait);
	init_waitqueue_head(&cur_trans->commit_wait);
	init_waitqueue_head(&cur_trans->pending_wait);
	cur_trans->state = TRANS_STATE_RUNNING;
	/*
         * One for this trans handle, one so it will live on until we
         * commit the transaction.
         */
	atomic_set(&cur_trans->use_count, 2);
	atomic_set(&cur_trans->pending_ordered, 0);
	cur_trans->flags = 0;
	cur_trans->start_time = get_seconds();

	memset(&cur_trans->delayed_refs, 0, sizeof(cur_trans->delayed_refs));

	cur_trans->delayed_refs.href_root = RB_ROOT;
	cur_trans->delayed_refs.dirty_extent_root = RB_ROOT;
	atomic_set(&cur_trans->delayed_refs.num_entries, 0);

	/*
         * although the tree mod log is per file system and not per transaction,
         * the log must never go across transaction boundaries.
         */
	smp_mb();
	if (!list_empty(&fs_info->tree_mod_seq_list))
		WARN(1, KERN_ERR "BTRFS: tree_mod_seq_list not empty when creating a fresh transaction\n");
	if (!RB_EMPTY_ROOT(&fs_info->tree_mod_log))
		WARN(1, KERN_ERR "BTRFS: tree_mod_log rb tree not empty when creating a fresh transaction\n");
	atomic64_set(&fs_info->tree_mod_seq, 0);

	spin_lock_init(&cur_trans->delayed_refs.lock);

	INIT_LIST_HEAD(&cur_trans->pending_snapshots);
	INIT_LIST_HEAD(&cur_trans->pending_chunks);
	INIT_LIST_HEAD(&cur_trans->switch_commits);
	INIT_LIST_HEAD(&cur_trans->dirty_bgs);
	INIT_LIST_HEAD(&cur_trans->io_bgs);
	INIT_LIST_HEAD(&cur_trans->dropped_roots);
	mutex_init(&cur_trans->cache_write_mutex);
	cur_trans->num_dirty_bgs = 0;
	spin_lock_init(&cur_trans->dirty_bgs_lock);
	INIT_LIST_HEAD(&cur_trans->deleted_bgs);
	spin_lock_init(&cur_trans->dropped_roots_lock);
	list_add_tail(&cur_trans->list, &fs_info->trans_list);
	extent_io_tree_init(&cur_trans->dirty_pages,
			     fs_info->btree_inode->i_mapping);
	fs_info->generation++;
	cur_trans->transid = fs_info->generation;
	fs_info->running_transaction = cur_trans;
	cur_trans->aborted = 0;
	spin_unlock(&fs_info->trans_lock);

	return 0;
}

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miao xie
75
12.52%
5
10.20%
jeff mahoney
jeff mahoney
61
10.18%
5
10.20%
jan schmidt
jan schmidt
44
7.35%
2
4.08%
alexandru moise
alexandru moise
16
2.67%
1
2.04%
david sterba
david sterba
10
1.67%
1
2.04%
tsutomu itoh
tsutomu itoh
7
1.17%
1
2.04%
qu wenruo
qu wenruo
6
1.00%
1
2.04%
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julia lawall
6
1.00%
1
2.04%
zhao lei
zhao lei
4
0.67%
1
2.04%
liu bo
liu bo
3
0.50%
1
2.04%
josef whiter
josef whiter
2
0.33%
1
2.04%
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599
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49
100.00%

/*
 * this does all the record keeping required to make sure that a reference
 * counted root is properly recorded in a given transaction.  This is required
 * to make sure the old root from before we joined the transaction is deleted
 * when the transaction commits
 */


static int record_root_in_trans(struct btrfs_trans_handle *trans,
			       struct btrfs_root *root,
			       int force)
{
	struct btrfs_fs_info *fs_info = root->fs_info;

	if ((test_bit(BTRFS_ROOT_REF_COWS, &root->state) &&
	    root->last_trans < trans->transid) || force) {
		WARN_ON(root == fs_info->extent_root);
		WARN_ON(root->commit_root != root->node);

		/*
                 * see below for IN_TRANS_SETUP usage rules
                 * we have the reloc mutex held now, so there
                 * is only one writer in this function
                 */
		set_bit(BTRFS_ROOT_IN_TRANS_SETUP, &root->state);

		/* make sure readers find IN_TRANS_SETUP before
                 * they find our root->last_trans update
                 */
		smp_wmb();

		spin_lock(&fs_info->fs_roots_radix_lock);
		if (root->last_trans == trans->transid && !force) {
			spin_unlock(&fs_info->fs_roots_radix_lock);
			return 0;
		}
		radix_tree_tag_set(&fs_info->fs_roots_radix,
				   (unsigned long)root->root_key.objectid,
				   BTRFS_ROOT_TRANS_TAG);
		spin_unlock(&fs_info->fs_roots_radix_lock);
		root->last_trans = trans->transid;

		/* this is pretty tricky.  We don't want to
                 * take the relocation lock in btrfs_record_root_in_trans
                 * unless we're really doing the first setup for this root in
                 * this transaction.
                 *
                 * Normally we'd use root->last_trans as a flag to decide
                 * if we want to take the expensive mutex.
                 *
                 * But, we have to set root->last_trans before we
                 * init the relocation root, otherwise, we trip over warnings
                 * in ctree.c.  The solution used here is to flag ourselves
                 * with root IN_TRANS_SETUP.  When this is 1, we're still
                 * fixing up the reloc trees and everyone must wait.
                 *
                 * When this is zero, they can trust root->last_trans and fly
                 * through btrfs_record_root_in_trans without having to take the
                 * lock.  smp_wmb() makes sure that all the writes above are
                 * done before we pop in the zero below
                 */
		btrfs_init_reloc_root(trans, root);
		smp_mb__before_atomic();
		clear_bit(BTRFS_ROOT_IN_TRANS_SETUP, &root->state);
	}
	return 0;
}


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4
26.67%
josef bacik
josef bacik
34
18.58%
1
6.67%
miao xie
miao xie
24
13.11%
1
6.67%
qu wenruo
qu wenruo
10
5.46%
1
6.67%
jeff mahoney
jeff mahoney
9
4.92%
1
6.67%
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183
100.00%
15
100.00%



void btrfs_add_dropped_root(struct btrfs_trans_handle *trans,
			    struct btrfs_root *root)
{
	struct btrfs_fs_info *fs_info = root->fs_info;
	struct btrfs_transaction *cur_trans = trans->transaction;

	/* Add ourselves to the transaction dropped list */
	spin_lock(&cur_trans->dropped_roots_lock);
	list_add_tail(&root->root_list, &cur_trans->dropped_roots);
	spin_unlock(&cur_trans->dropped_roots_lock);

	/* Make sure we don't try to update the root at commit time */
	spin_lock(&fs_info->fs_roots_radix_lock);
	radix_tree_tag_clear(&fs_info->fs_roots_radix,
			     (unsigned long)root->root_key.objectid,
			     BTRFS_ROOT_TRANS_TAG);
	spin_unlock(&fs_info->fs_roots_radix_lock);
}

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1
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100
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int btrfs_record_root_in_trans(struct btrfs_trans_handle *trans,
			       struct btrfs_root *root)
{
	struct btrfs_fs_info *fs_info = root->fs_info;

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

	/*
         * see record_root_in_trans for comments about IN_TRANS_SETUP usage
         * and barriers
         */
	smp_rmb();
	if (root->last_trans == trans->transid &&
	    !test_bit(BTRFS_ROOT_IN_TRANS_SETUP, &root->state))
		return 0;

	mutex_lock(&fs_info->reloc_mutex);
	record_root_in_trans(trans, root, 0);
	mutex_unlock(&fs_info->reloc_mutex);

	return 0;
}

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15.62%
1
25.00%
jeff mahoney
jeff mahoney
9
9.38%
1
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qu wenruo
qu wenruo
2
2.08%
1
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static inline int is_transaction_blocked(struct btrfs_transaction *trans)
{
	return (trans->state >= TRANS_STATE_BLOCKED &&
		trans->state < TRANS_STATE_UNBLOCKED &&
		!trans->aborted);
}

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/* wait for commit against the current transaction to become unblocked
 * when this is done, it is safe to start a new transaction, but the current
 * transaction might not be fully on disk.
 */


static void wait_current_trans(struct btrfs_fs_info *fs_info)
{
	struct btrfs_transaction *cur_trans;

	spin_lock(&fs_info->trans_lock);
	cur_trans = fs_info->running_transaction;
	if (cur_trans && is_transaction_blocked(cur_trans)) {
		atomic_inc(&cur_trans->use_count);
		spin_unlock(&fs_info->trans_lock);

		wait_event(fs_info->transaction_wait,
			   cur_trans->state >= TRANS_STATE_UNBLOCKED ||
			   cur_trans->aborted);
		btrfs_put_transaction(cur_trans);
	} else {
		spin_unlock(&fs_info->trans_lock);
	}
}

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4
36.36%
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miao xie
6
6.67%
1
9.09%
jeff mahoney
jeff mahoney
6
6.67%
2
18.18%
li zefan
li zefan
1
1.11%
1
9.09%
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90
100.00%
11
100.00%



static int may_wait_transaction(struct btrfs_fs_info *fs_info, int type)
{
	if (test_bit(BTRFS_FS_LOG_RECOVERING, &fs_info->flags))
		return 0;

	if (type == TRANS_USERSPACE)
		return 1;

	if (type == TRANS_START &&
	    !atomic_read(&fs_info->open_ioctl_trans))
		return 1;

	return 0;
}

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44.07%
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jeff mahoney
2
3.39%
1
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static inline bool need_reserve_reloc_root(struct btrfs_root *root)
{
	struct btrfs_fs_info *fs_info = root->fs_info;

	if (!fs_info->reloc_ctl ||
	    !test_bit(BTRFS_ROOT_REF_COWS, &root->state) ||
	    root->root_key.objectid == BTRFS_TREE_RELOC_OBJECTID ||
	    root->reloc_root)
		return false;

	return true;
}

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33.33%
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100.00%


static struct btrfs_trans_handle *

start_transaction(struct btrfs_root *root, unsigned int num_items,
		  unsigned int type, enum btrfs_reserve_flush_enum flush)
{
	struct btrfs_fs_info *fs_info = root->fs_info;

	struct btrfs_trans_handle *h;
	struct btrfs_transaction *cur_trans;
	u64 num_bytes = 0;
	u64 qgroup_reserved = 0;
	bool reloc_reserved = false;
	int ret;

	/* Send isn't supposed to start transactions. */
	ASSERT(current->journal_info != BTRFS_SEND_TRANS_STUB);

	if (test_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state))
		return ERR_PTR(-EROFS);

	if (current->journal_info) {
		WARN_ON(type & TRANS_EXTWRITERS);
		h = current->journal_info;
		h->use_count++;
		WARN_ON(h->use_count > 2);
		h->orig_rsv = h->block_rsv;
		h->block_rsv = NULL;
		goto got_it;
	}

	/*
         * Do the reservation before we join the transaction so we can do all
         * the appropriate flushing if need be.
         */
	if (num_items > 0 && root != fs_info->chunk_root) {
		qgroup_reserved = num_items * fs_info->nodesize;
		ret = btrfs_qgroup_reserve_meta(root, qgroup_reserved);
		if (ret)
			return ERR_PTR(ret);

		num_bytes = btrfs_calc_trans_metadata_size(fs_info, num_items);
		/*
                 * Do the reservation for the relocation root creation
                 */
		if (need_reserve_reloc_root(root)) {
			num_bytes += fs_info->nodesize;
			reloc_reserved = true;
		}

		ret = btrfs_block_rsv_add(root, &fs_info->trans_block_rsv,
					  num_bytes, flush);
		if (ret)
			goto reserve_fail;
	}
again:
	h = kmem_cache_zalloc(btrfs_trans_handle_cachep, GFP_NOFS);
	if (!h) {
		ret = -ENOMEM;
		goto alloc_fail;
	}

	/*
         * If we are JOIN_NOLOCK we're already committing a transaction and
         * waiting on this guy, so we don't need to do the sb_start_intwrite
         * because we're already holding a ref.  We need this because we could
         * have raced in and did an fsync() on a file which can kick a commit
         * and then we deadlock with somebody doing a freeze.
         *
         * If we are ATTACH, it means we just want to catch the current
         * transaction and commit it, so we needn't do sb_start_intwrite(). 
         */
	if (type & __TRANS_FREEZABLE)
		sb_start_intwrite(fs_info->sb);

	if (may_wait_transaction(fs_info, type))
		wait_current_trans(fs_info);

	do {
		ret = join_transaction(fs_info, type);
		if (ret == -EBUSY) {
			wait_current_trans(fs_info);
			if (unlikely(type == TRANS_ATTACH))
				ret = -ENOENT;
		}
	} while (ret == -EBUSY);

	if (ret < 0)
		goto join_fail;

	cur_trans = fs_info->running_transaction;

	h->transid = cur_trans->transid;
	h->transaction = cur_trans;
	h->root = root;
	h->use_count = 1;
	h->fs_info = root->fs_info;

	h->type = type;
	h->can_flush_pending_bgs = true;
	INIT_LIST_HEAD(&h->qgroup_ref_list);
	INIT_LIST_HEAD(&h->new_bgs);

	smp_mb();
	if (cur_trans->state >= TRANS_STATE_BLOCKED &&
	    may_wait_transaction(fs_info, type)) {
		current->journal_info = h;
		btrfs_commit_transaction(h);
		goto again;
	}

	if (num_bytes) {
		trace_btrfs_space_reservation(fs_info, "transaction",
					      h->transid, num_bytes, 1);
		h->block_rsv = &fs_info->trans_block_rsv;
		h->bytes_reserved = num_bytes;
		h->reloc_reserved = reloc_reserved;
	}

got_it:
	btrfs_record_root_in_trans(h, root);

	if (!current->journal_info && type != TRANS_USERSPACE)
		current->journal_info = h;
	return h;

join_fail:
	if (type & __TRANS_FREEZABLE)
		sb_end_intwrite(fs_info->sb);
	kmem_cache_free(btrfs_trans_handle_cachep, h);
alloc_fail:
	if (num_bytes)
		btrfs_block_rsv_release(fs_info, &fs_info->trans_block_rsv,
					num_bytes);
reserve_fail:
	btrfs_qgroup_free_meta(root, qgroup_reserved);
	return ERR_PTR(ret);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
josef bacik
josef bacik
171
29.69%
12
23.53%
miao xie
miao xie
149
25.87%
11
21.57%
zheng yan
zheng yan
78
13.54%
2
3.92%
chris mason
chris mason
55
9.55%
7
13.73%
arne jansen
arne jansen
42
7.29%
3
5.88%
jeff mahoney
jeff mahoney
28
4.86%
5
9.80%
filipe david borba manana
filipe david borba manana
20
3.47%
3
5.88%
liu bo
liu bo
15
2.60%
2
3.92%
jan kara
jan kara
7
1.22%
1
1.96%
tsutomu itoh
tsutomu itoh
5
0.87%
1
1.96%
alexandru moise
alexandru moise
3
0.52%
2
3.92%
qu wenruo
qu wenruo
2
0.35%
1
1.96%
david sterba
david sterba
1
0.17%
1
1.96%
Total
576
100.00%
51
100.00%



struct btrfs_trans_handle *btrfs_start_transaction(struct btrfs_root *root,
						   unsigned int num_items)
{
	return start_transaction(root, num_items, TRANS_START,
				 BTRFS_RESERVE_FLUSH_ALL);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
chris mason
chris mason
19
67.86%
1
16.67%
miao xie
miao xie
5
17.86%
2
33.33%
zheng yan
zheng yan
2
7.14%
1
16.67%
josef bacik
josef bacik
1
3.57%
1
16.67%
alexandru moise
alexandru moise
1
3.57%
1
16.67%
Total
28
100.00%
6
100.00%



struct btrfs_trans_handle *btrfs_start_transaction_fallback_global_rsv(
					struct btrfs_root *root,
					unsigned int num_items,
					int min_factor)
{
	struct btrfs_fs_info *fs_info = root->fs_info;
	struct btrfs_trans_handle *trans;
	u64 num_bytes;
	int ret;

	trans = btrfs_start_transaction(root, num_items);
	if (!IS_ERR(trans) || PTR_ERR(trans) != -ENOSPC)
		return trans;

	trans = btrfs_start_transaction(root, 0);
	if (IS_ERR(trans))
		return trans;

	num_bytes = btrfs_calc_trans_metadata_size(fs_info, num_items);
	ret = btrfs_cond_migrate_bytes(fs_info, &fs_info->trans_block_rsv,
				       num_bytes, min_factor);
	if (ret) {
		btrfs_end_transaction(trans);
		return ERR_PTR(ret);
	}

	trans->block_rsv = &fs_info->trans_block_rsv;
	trans->bytes_reserved = num_bytes;
	trace_btrfs_space_reservation(fs_info, "transaction",
				      trans->transid, num_bytes, 1);

	return trans;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
filipe david borba manana
filipe david borba manana
136
84.47%
1
25.00%
josef bacik
josef bacik
15
9.32%
1
25.00%
jeff mahoney
jeff mahoney
10
6.21%
2
50.00%
Total
161
100.00%
4
100.00%



struct btrfs_trans_handle *btrfs_start_transaction_lflush(
					struct btrfs_root *root,
					unsigned int num_items)
{
	return start_transaction(root, num_items, TRANS_START,
				 BTRFS_RESERVE_FLUSH_LIMIT);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
miao xie
miao xie
24
85.71%
2
50.00%
chris mason
chris mason
3
10.71%
1
25.00%
alexandru moise
alexandru moise
1
3.57%
1
25.00%
Total
28
100.00%
4
100.00%



struct btrfs_trans_handle *btrfs_join_transaction(struct btrfs_root *root)
{
	return start_transaction(root, 0, TRANS_JOIN,
				 BTRFS_RESERVE_NO_FLUSH);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
chris mason
chris mason
17
70.83%
1
16.67%
sage weil
sage weil
3
12.50%
1
16.67%
miao xie
miao xie
1
4.17%
1
16.67%
zheng yan
zheng yan
1
4.17%
1
16.67%
alexandru moise
alexandru moise
1
4.17%
1
16.67%
josef bacik
josef bacik
1
4.17%
1
16.67%
Total
24
100.00%
6
100.00%



struct btrfs_trans_handle *btrfs_join_transaction_nolock(struct btrfs_root *root)
{
	return start_transaction(root, 0, TRANS_JOIN_NOLOCK,
				 BTRFS_RESERVE_NO_FLUSH);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
josef bacik
josef bacik
22
91.67%
1
33.33%
miao xie
miao xie
1
4.17%
1
33.33%
alexandru moise
alexandru moise
1
4.17%
1
33.33%
Total
24
100.00%
3
100.00%



struct btrfs_trans_handle *btrfs_start_ioctl_transaction(struct btrfs_root *root)
{
	return start_transaction(root, 0, TRANS_USERSPACE,
				 BTRFS_RESERVE_NO_FLUSH);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
sage weil
sage weil
15
62.50%
1
14.29%
josef bacik
josef bacik
3
12.50%
2
28.57%
chris mason
chris mason
3
12.50%
1
14.29%
alexandru moise
alexandru moise
1
4.17%
1
14.29%
zheng yan
zheng yan
1
4.17%
1
14.29%
miao xie
miao xie
1
4.17%
1
14.29%
Total
24
100.00%
7
100.00%

/*
 * btrfs_attach_transaction() - catch the running transaction
 *
 * It is used when we want to commit the current the transaction, but
 * don't want to start a new one.
 *
 * Note: If this function return -ENOENT, it just means there is no
 * running transaction. But it is possible that the inactive transaction
 * is still in the memory, not fully on disk. If you hope there is no
 * inactive transaction in the fs when -ENOENT is returned, you should
 * invoke
 *     btrfs_attach_transaction_barrier()
 */


struct btrfs_trans_handle *btrfs_attach_transaction(struct btrfs_root *root)
{
	return start_transaction(root, 0, TRANS_ATTACH,
				 BTRFS_RESERVE_NO_FLUSH);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
josef bacik
josef bacik
21
87.50%
1
33.33%
miao xie
miao xie
2
8.33%
1
33.33%
alexandru moise
alexandru moise
1
4.17%
1
33.33%
Total
24
100.00%
3
100.00%

/*
 * btrfs_attach_transaction_barrier() - catch the running transaction
 *
 * It is similar to the above function, the differentia is this one
 * will wait for all the inactive transactions until they fully
 * complete.
 */

struct btrfs_trans_handle *

btrfs_attach_transaction_barrier(struct btrfs_root *root)
{
	struct btrfs_trans_handle *trans;

	trans = start_transaction(root, 0, TRANS_ATTACH,
				  BTRFS_RESERVE_NO_FLUSH);
	if (IS_ERR(trans) && PTR_ERR(trans) == -ENOENT)
		btrfs_wait_for_commit(root->fs_info, 0);

	return trans;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
miao xie
miao xie
54
94.74%
1
33.33%
jeff mahoney
jeff mahoney
2
3.51%
1
33.33%
alexandru moise
alexandru moise
1
1.75%
1
33.33%
Total
57
100.00%
3
100.00%

/* wait for a transaction commit to be fully complete */


static noinline void wait_for_commit(struct btrfs_transaction *commit)
{
	wait_event(commit->commit_wait, commit->state == TRANS_STATE_COMPLETED);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
chris mason
chris mason
20
80.00%
1
25.00%
miao xie
miao xie
3
12.00%
1
25.00%
li zefan
li zefan
2
8.00%
2
50.00%
Total
25
100.00%
4
100.00%



int btrfs_wait_for_commit(struct btrfs_fs_info *fs_info, u64 transid)
{
	struct btrfs_transaction *cur_trans = NULL, *t;
	int ret = 0;

	if (transid) {
		if (transid <= fs_info->last_trans_committed)
			goto out;

		/* find specified transaction */
		spin_lock(&fs_info->trans_lock);
		list_for_each_entry(t, &fs_info->trans_list, list) {
			if (t->transid == transid) {
				cur_trans = t;
				atomic_inc(&cur_trans->use_count);
				ret = 0;
				break;
			}
			if (t->transid > transid) {
				ret = 0;
				break;
			}
		}
		spin_unlock(&fs_info->trans_lock);

		/*
                 * The specified transaction doesn't exist, or we
                 * raced with btrfs_commit_transaction
                 */
		if (!cur_trans) {
			if (transid > fs_info->last_trans_committed)
				ret = -EINVAL;
			goto out;
		}
	} else {
		/* find newest transaction that is committing | committed */
		spin_lock(&fs_info->trans_lock);
		list_for_each_entry_reverse(t, &fs_info->trans_list,
					    list) {
			if (t->state >= TRANS_STATE_COMMIT_START) {
				if (t->state == TRANS_STATE_COMPLETED)
					break;
				cur_trans = t;
				atomic_inc(&cur_trans->use_count);
				break;
			}
		}
		spin_unlock(&fs_info->trans_lock);
		if (!cur_trans)
			goto out;  /* nothing committing|committed */
	}

	wait_for_commit(cur_trans);
	btrfs_put_transaction(cur_trans);
out:
	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
sage weil
sage weil
146
65.18%
2
20.00%
josef bacik
josef bacik
56
25.00%
4
40.00%
miao xie
miao xie
18
8.04%
2
20.00%
jeff mahoney
jeff mahoney
4
1.79%
2
20.00%
Total
224
100.00%
10
100.00%



void btrfs_throttle(struct btrfs_fs_info *fs_info)
{
	if (!atomic_read(&fs_info->open_ioctl_trans))
		wait_current_trans(fs_info);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
chris mason
chris mason
8
30.77%
2
28.57%
sage weil
sage weil
7
26.92%
1
14.29%
jeff mahoney
jeff mahoney
6
23.08%
2
28.57%
josef bacik
josef bacik
4
15.38%
1
14.29%
zheng yan
zheng yan
1
3.85%
1
14.29%
Total
26
100.00%
7
100.00%



static int should_end_transaction(struct btrfs_trans_handle *trans)
{
	struct btrfs_fs_info *fs_info = trans->fs_info;

	if (fs_info->global_block_rsv.space_info->full &&
	    btrfs_check_space_for_delayed_refs(trans, fs_info))
		return 1;

	return !!btrfs_block_rsv_check(&fs_info->global_block_rsv, 5);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
josef bacik
josef bacik
21
39.62%
2
40.00%
zheng yan
zheng yan
21
39.62%
1
20.00%
jeff mahoney
jeff mahoney
11
20.75%
2
40.00%
Total
53
100.00%
5
100.00%



int btrfs_should_end_transaction(struct btrfs_trans_handle *trans)
{
	struct btrfs_transaction *cur_trans = trans->transaction;
	struct btrfs_fs_info *fs_info = trans->fs_info;
	int updates;
	int err;

	smp_mb();
	if (cur_trans->state >= TRANS_STATE_BLOCKED ||
	    cur_trans->delayed_refs.flushing)
		return 1;

	updates = trans->delayed_ref_updates;
	trans->delayed_ref_updates = 0;
	if (updates) {
		err = btrfs_run_delayed_refs(trans, fs_info, updates * 2);
		if (err) /* Error code will also eval true */
			return err;
	}

	return should_end_transaction(trans);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
zheng yan
zheng yan
63
63.64%
1
14.29%
jeff mahoney
jeff mahoney
28
28.28%
3
42.86%
miao xie
miao xie
3
3.03%
1
14.29%
josef bacik
josef bacik
3
3.03%
1
14.29%
chris mason
chris mason
2
2.02%
1
14.29%
Total
99
100.00%
7
100.00%



static int __btrfs_end_transaction(struct btrfs_trans_handle *trans,
				   int throttle)
{
	struct btrfs_fs_info *info = trans->fs_info;
	struct btrfs_transaction *cur_trans = trans->transaction;
	u64 transid = trans->transid;
	unsigned long cur = trans->delayed_ref_updates;
	int lock = (trans->type != TRANS_JOIN_NOLOCK);
	int err = 0;
	int must_run_delayed_refs = 0;

	if (trans->use_count > 1) {
		trans->use_count--;
		trans->block_rsv = trans->orig_rsv;
		return 0;
	}

	btrfs_trans_release_metadata(trans, info);
	trans->block_rsv = NULL;

	if (!list_empty(&trans->new_bgs))
		btrfs_create_pending_block_groups(trans, info);

	trans->delayed_ref_updates = 0;
	if (!trans->sync) {
		must_run_delayed_refs =
			btrfs_should_throttle_delayed_refs(trans, info);
		cur = max_t(unsigned long, cur, 32);

		/*
                 * don't make the caller wait if they are from a NOLOCK
                 * or ATTACH transaction, it will deadlock with commit
                 */
		if (must_run_delayed_refs == 1 &&
		    (trans->type & (__TRANS_JOIN_NOLOCK | __TRANS_ATTACH)))
			must_run_delayed_refs = 2;
	}

	btrfs_trans_release_metadata(trans, info);
	trans->block_rsv = NULL;

	if (!list_empty(&trans->new_bgs))
		btrfs_create_pending_block_groups(trans, info);

	btrfs_trans_release_chunk_metadata(trans);

	if (lock && !atomic_read(&info->open_ioctl_trans) &&
	    should_end_transaction(trans) &&
	    ACCESS_ONCE(cur_trans->state) == TRANS_STATE_RUNNING) {
		spin_lock(&info->trans_lock);
		if (cur_trans->state == TRANS_STATE_RUNNING)
			cur_trans->state = TRANS_STATE_BLOCKED;
		spin_unlock(&info->trans_lock);
	}

	if (lock && ACCESS_ONCE(cur_trans->state) == TRANS_STATE_BLOCKED) {
		if (throttle)
			return btrfs_commit_transaction(trans);
		else
			wake_up_process(info->transaction_kthread);
	}

	if (trans->type & __TRANS_FREEZABLE)
		sb_end_intwrite(info->sb);

	WARN_ON(cur_trans != info->running_transaction);
	WARN_ON(atomic_read(&cur_trans->num_writers) < 1);
	atomic_dec(&cur_trans->num_writers);
	extwriter_counter_dec(cur_trans, trans->type);

	/*
         * Make sure counter is updated before we wake up waiters.
         */
	smp_mb();
	if (waitqueue_active(&cur_trans->writer_wait))
		wake_up(&cur_trans->writer_wait);
	btrfs_put_transaction(cur_trans);

	if (current->journal_info == trans)
		current->journal_info = NULL;

	if (throttle)
		btrfs_run_delayed_iputs(info);

	if (trans->aborted ||
	    test_bit(BTRFS_FS_STATE_ERROR, &info->fs_state)) {
		wake_up_process(info->transaction_kthread);
		err = -EIO;
	}
	assert_qgroups_uptodate(trans);

	kmem_cache_free(btrfs_trans_handle_cachep, trans);
	if (must_run_delayed_refs) {
		btrfs_async_run_delayed_refs(info, cur, transid,
					     must_run_delayed_refs == 1);
	}
	return err;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
josef bacik
josef bacik
168
35.07%
18
41.86%
chris mason
chris mason
131
27.35%
8
18.60%
miao xie
miao xie
71
14.82%
5
11.63%
zheng yan
zheng yan
48
10.02%
2
4.65%
jeff mahoney
jeff mahoney
28
5.85%
4
9.30%
dave jones
dave jones
17
3.55%
1
2.33%
jan schmidt
jan schmidt
5
1.04%
1
2.33%
filipe david borba manana
filipe david borba manana
5
1.04%
1
2.33%
sage weil
sage weil
3
0.63%
1
2.33%
arne jansen
arne jansen
2
0.42%
1
2.33%
david sterba
david sterba
1
0.21%
1
2.33%
Total
479
100.00%
43
100.00%



int btrfs_end_transaction(struct btrfs_trans_handle *trans)
{
	return __btrfs_end_transaction(trans, 0);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
chris mason
chris mason
17
94.44%
1
50.00%
wang shilong
wang shilong
1
5.56%
1
50.00%
Total
18
100.00%
2
100.00%



int btrfs_end_transaction_throttle(struct btrfs_trans_handle *trans)
{
	return __btrfs_end_transaction(trans, 1);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
chris mason
chris mason
15
83.33%
1
33.33%
miao xie
miao xie
2
11.11%
1
33.33%
wang shilong
wang shilong
1
5.56%
1
33.33%
Total
18
100.00%
3
100.00%

/*
 * when btree blocks are allocated, they have some corresponding bits set for
 * them in one of two extent_io trees.  This is used to make sure all of
 * those extents are sent to disk but does not wait on them
 */


int btrfs_write_marked_extents(struct btrfs_fs_info *fs_info,
			       struct extent_io_tree *dirty_pages, int mark)
{
	int err = 0;
	int werr = 0;
	struct address_space *mapping = fs_info->btree_inode->i_mapping;
	struct extent_state *cached_state = NULL;
	u64 start = 0;
	u64 end;

	while (!find_first_extent_bit(dirty_pages, start, &start, &end,
				      mark, &cached_state)) {
		bool wait_writeback = false;

		err = convert_extent_bit(dirty_pages, start, end,
					 EXTENT_NEED_WAIT,
					 mark, &cached_state);
		/*
                 * convert_extent_bit can return -ENOMEM, which is most of the
                 * time a temporary error. So when it happens, ignore the error
                 * and wait for writeback of this range to finish - because we
                 * failed to set the bit EXTENT_NEED_WAIT for the range, a call
                 * to __btrfs_wait_marked_extents() would not know that
                 * writeback for this range started and therefore wouldn't
                 * wait for it to finish - we don't want to commit a
                 * superblock that points to btree nodes/leafs for which
                 * writeback hasn't finished yet (and without errors).
                 * We cleanup any entries left in the io tree when committing
                 * the transaction (through clear_btree_io_tree()).
                 */
		if (err == -ENOMEM) {
			err = 0;
			wait_writeback = true;
		}
		if (!err)
			err = filemap_fdatawrite_range(mapping, start, end);
		if (err)
			werr = err;
		else if (wait_writeback)
			werr = filemap_fdatawait_range(mapping, start, end);
		free_extent_state(cached_state);
		cached_state = NULL;
		cond_resched();
		start = end + 1;
	}
	return werr;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
chris mason
chris mason
75
41.90%
10
55.56%
filipe david borba manana
filipe david borba manana
52
29.05%
2
11.11%
josef bacik
josef bacik
40
22.35%
2
11.11%
jeff mahoney
jeff mahoney
8
4.47%
3
16.67%
zheng yan
zheng yan
4
2.23%
1
5.56%
Total
179
100.00%
18
100.00%

/*
 * when btree blocks are allocated, they have some corresponding bits set for
 * them in one of two extent_io trees.  This is used to make sure all of
 * those extents are on disk for transaction or log commit.  We wait
 * on all the pages and clear them from the dirty pages state tree
 */


static int __btrfs_wait_marked_extents(struct btrfs_fs_info *fs_info,
				       struct extent_io_tree *dirty_pages)
{
	int err = 0;
	int werr = 0;
	struct address_space *mapping = fs_info->btree_inode->i_mapping;
	struct extent_state *cached_state = NULL;
	u64 start = 0;
	u64 end;

	while (!find_first_extent_bit(dirty_pages, start, &start, &end,
				      EXTENT_NEED_WAIT, &cached_state)) {
		/*
                 * Ignore -ENOMEM errors returned by clear_extent_bit().
                 * When committing the transaction, we'll remove any entries
                 * left in the io tree. For a log commit, we don't remove them
                 * after committing the log because the tree can be accessed
                 * concurrently - we do it only at transaction commit time when
                 * it's safe to do it (through clear_btree_io_tree()).
                 */
		err = clear_extent_bit(dirty_pages, start, end,
				       EXTENT_NEED_WAIT,
				       0, 0, &cached_state, GFP_NOFS);
		if (err == -ENOMEM)
			err = 0;
		if (!err)
			err = filemap_fdatawait_range(mapping, start, end);
		if (err)
			werr = err;
		free_extent_state(cached_state);
		cached_state = NULL;
		cond_resched();
		start = end + 1;
	}
	if (err)
		werr = err;
	return werr;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
chris mason
chris mason
84
51.85%
3
30.00%
josef bacik
josef bacik
35
21.60%
2
20.00%
filipe david borba manana
filipe david borba manana
28
17.28%
2
20.00%
jeff mahoney
jeff mahoney
13
8.02%
2
20.00%
zheng yan
zheng yan
2
1.23%
1
10.00%
Total
162
100.00%
10
100.00%



int btrfs_wait_extents(struct btrfs_fs_info *fs_info,
		       struct extent_io_tree *dirty_pages)
{
	bool errors = false;
	int err;

	err = __btrfs_wait_marked_extents(fs_info, dirty_pages);
	if (test_and_clear_bit(BTRFS_FS_BTREE_ERR, &fs_info->flags))
		errors = true;

	if (errors && !err)
		err = -EIO;
	return err;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
jeff mahoney
jeff mahoney
61
96.83%
1
50.00%
filipe david borba manana
filipe david borba manana
2
3.17%
1
50.00%
Total
63
100.00%
2
100.00%



int btrfs_wait_tree_log_extents(struct btrfs_root *log_root, int mark)
{
	struct btrfs_fs_info *fs_info = log_root->fs_info;
	struct extent_io_tree *dirty_pages = &log_root->dirty_log_pages;
	bool errors = false;
	int err;

	ASSERT(log_root->root_key.objectid == BTRFS_TREE_LOG_OBJECTID);

	err = __btrfs_wait_marked_extents(fs_info, dirty_pages);
	if ((mark & EXTENT_DIRTY) &&
	    test_and_clear_bit(BTRFS_FS_LOG1_ERR, &fs_info->flags))
		errors = true;

	if ((mark & EXTENT_NEW) &&
	    test_and_clear_bit(BTRFS_FS_LOG2_ERR, &fs_info->flags))
		errors = true;

	if (errors && !err)
		err = -EIO;
	return err;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
jeff mahoney
jeff mahoney
56
47.06%
1
20.00%
filipe david borba manana
filipe david borba manana
54
45.38%
1
20.00%
josef bacik
josef bacik
6
5.04%
1
20.00%
chris mason
chris mason
3
2.52%
2
40.00%
Total
119
100.00%
5
100.00%

/*
 * when btree blocks are allocated, they have some corresponding bits set for
 * them in one of two extent_io trees.  This is used to make sure all of
 * those extents are on disk for transaction or log commit
 */


static int btrfs_write_and_wait_marked_extents(struct btrfs_fs_info *fs_info,
				struct extent_io_tree *dirty_pages, int mark)
{
	int ret;
	int ret2;
	struct blk_plug plug;

	blk_start_plug(&plug);
	ret = btrfs_write_marked_extents(fs_info, dirty_pages, mark);
	blk_finish_plug(&plug);
	ret2 = btrfs_wait_extents(fs_info, dirty_pages);

	if (ret)
		return ret;
	if (ret2)
		return ret2;
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
chris mason
chris mason
51
65.38%
2
28.57%
miao xie
miao xie
16
20.51%
1
14.29%
jeff mahoney
jeff mahoney
5
6.41%
2
28.57%
zheng yan
zheng yan
5
6.41%
1
14.29%
sergei trofimovich
sergei trofimovich
1
1.28%
1
14.29%
Total
78
100.00%
7
100.00%



static int btrfs_write_and_wait_transaction(struct btrfs_trans_handle *trans,
					    struct btrfs_fs_info *fs_info)
{
	int ret;

	ret = btrfs_write_and_wait_marked_extents(fs_info,
					   &trans->transaction->dirty_pages,
					   EXTENT_DIRTY);
	clear_btree_io_tree(&trans->transaction->dirty_pages);

	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
chris mason
chris mason
26
54.17%
1
25.00%
filipe david borba manana
filipe david borba manana
17
35.42%
1
25.00%
jeff mahoney
jeff mahoney
3
6.25%
1
25.00%
zheng yan
zheng yan
2
4.17%
1
25.00%
Total
48
100.00%
4
100.00%

/*
 * this is used to update the root pointer in the tree of tree roots.
 *
 * But, in the case of the extent allocation tree, updating the root
 * pointer may allocate blocks which may change the root of the extent
 * allocation tree.
 *
 * So, this loops and repeats and makes sure the cowonly root didn't
 * change while the root pointer was being updated in the metadata.
 */


static int update_cowonly_root(struct btrfs_trans_handle *trans,
			       struct btrfs_root *root)
{
	int ret;
	u64 old_root_bytenr;
	u64 old_root_used;
	struct btrfs_fs_info *fs_info = root->fs_info;
	struct btrfs_root *tree_root = fs_info->tree_root;

	old_root_used = btrfs_root_used(&root->root_item);

	while (1) {
		old_root_bytenr = btrfs_root_bytenr(&root->root_item);
		if (old_root_bytenr == root->node->start &&
		    old_root_used == btrfs_root_used(&root->root_item))
			break;

		btrfs_set_root_node(&root->root_item, root->node);
		ret = btrfs_update_root(trans, tree_root,
					&root->root_key,
					&root->root_item);
		if (ret)
			return ret;

		old_root_used = btrfs_root_used(&root->root_item);
	}

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
chris mason
chris mason
90
63.83%
4
40.00%
zheng yan
zheng yan
35
24.82%
3
30.00%
jeff mahoney
jeff mahoney
15
10.64%
2
20.00%
josef bacik
josef bacik
1
0.71%
1
10.00%
Total
141
100.00%
10
100.00%

/*
 * update all the cowonly tree roots on disk
 *
 * The error handling in this function may not be obvious. Any of the
 * failures will cause the file system to go offline. We still need
 * to clean up the delayed refs.
 */


static noinline int commit_cowonly_roots(struct btrfs_trans_handle *trans,
					 struct btrfs_fs_info *fs_info)
{
	struct list_head *dirty_bgs = &trans->transaction->dirty_bgs;
	struct list_head *io_bgs = &trans->transaction->io_bgs;
	struct list_head *next;
	struct extent_buffer *eb;
	int ret;

	eb = btrfs_lock_root_node(fs_info->tree_root);
	ret = btrfs_cow_block(trans, fs_info->tree_root, eb, NULL,
			      0, &eb);
	btrfs_tree_unlock(eb);
	free_extent_buffer(eb);

	if (ret)
		return ret;

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

	ret = btrfs_run_dev_stats(trans, fs_info);
	if (ret)
		return ret;
	ret = btrfs_run_dev_replace(trans, fs_info);
	if (ret)
		return ret;
	ret = btrfs_run_qgroups(trans, fs_info);
	if (ret)
		return ret;

	ret = btrfs_setup_space_cache(trans, fs_info);
	if (ret)
		return ret;

	/* run_qgroups might have added some more refs */
	ret = btrfs_run_delayed_refs(trans, fs_info, (unsigned long)-1);
	if (ret)
		return ret;
again:
	while (!list_empty(&fs_info->dirty_cowonly_roots)) {
		struct btrfs_root *root;
		next = fs_info->dirty_cowonly_roots.next;
		list_del_init(next);
		root = list_entry(next, struct btrfs_root, dirty_list);
		clear_bit(BTRFS_ROOT_DIRTY, &root->state);

		if (root != fs_info->extent_root)
			list_add_tail(&root->dirty_list,
				      &trans->transaction->switch_commits);
		ret = update_cowonly_root(trans, root);
		if (ret)
			return ret;
		ret = btrfs_run_delayed_refs(trans, fs_info, (unsigned long)-1);
		if (ret)
			return ret;
	}

	while (!list_empty(dirty_bgs) || !list_empty(io_bgs)) {
		ret = btrfs_write_dirty_block_groups(trans, fs_info);
		if (ret)
			return ret;
		ret = btrfs_run_delayed_refs(trans, fs_info, (unsigned long)-1);
		if (ret)
			return ret;
	}

	if (!list_empty(&fs_info->dirty_cowonly_roots))
		goto again;

	list_add_tail(&fs_info->extent_root->dirty_list,
		      &trans->transaction->switch_commits);
	btrfs_after_dev_replace_commit(fs_info);

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
josef bacik
josef bacik
177
41.94%
5
26.32%
chris mason
chris mason
102
24.17%
6
31.58%
zheng yan
zheng yan
54
12.80%
3
15.79%
jeff mahoney
jeff mahoney
37
8.77%
2
10.53%
jan schmidt
jan schmidt
27
6.40%
1
5.26%
stefan behrens
stefan behrens
25
5.92%
2
10.53%
Total
422
100.00%
19
100.00%

/*
 * dead roots are old snapshots that need to be deleted.  This allocates
 * a dirty root struct and adds it into the list of dead roots that need to
 * be deleted
 */


void btrfs_add_dead_root(struct btrfs_root *root)
{
	struct btrfs_fs_info *fs_info = root->fs_info;

	spin_lock(&fs_info->trans_lock);
	if (list_empty(&root->root_list))
		list_add_tail(&root->root_list, &fs_info->dead_roots);
	spin_unlock(&fs_info->trans_lock);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
zheng yan
zheng yan
18
31.03%
2
28.57%
chris mason
chris mason
15
25.86%
1
14.29%
josef bacik
josef bacik
15
25.86%
2
28.57%
jeff mahoney
jeff mahoney
9
15.52%
1
14.29%
david sterba
david sterba
1
1.72%
1
14.29%
Total
58
100.00%
7
100.00%

/*
 * update all the cowonly tree roots on disk
 */


static noinline int commit_fs_roots(struct btrfs_trans_handle *trans,
				    struct btrfs_fs_info *fs_info)
{
	struct btrfs_root *gang[8];
	int i;
	int ret;
	int err = 0;

	spin_lock(&fs_info->fs_roots_radix_lock);
	while (1) {
		ret = radix_tree_gang_lookup_tag(&fs_info->fs_roots_radix,
						 (void **)gang, 0,
						 ARRAY_SIZE(gang),
						 BTRFS_ROOT_TRANS_TAG);
		if (ret == 0)
			break;
		for (i = 0; i < ret; i++) {
			struct btrfs_root *root = gang[i];
			radix_tree_tag_clear(&fs_info->fs_roots_radix,
					(unsigned long)root->root_key.objectid,
					BTRFS_ROOT_TRANS_TAG);
			spin_unlock(&fs_info->fs_roots_radix_lock);

			btrfs_free_log(trans, root);
			btrfs_update_reloc_root(trans, root);
			btrfs_orphan_commit_root(trans, root);

			btrfs_save_ino_cache(root, trans);

			/* see comments in should_cow_block() */
			clear_bit(BTRFS_ROOT_FORCE_COW, &root->state);
			smp_mb__after_atomic();

			if (root->commit_root != root->node) {
				list_add_tail(&root->dirty_list,
					&trans->transaction->switch_commits);
				btrfs_set_root_node(&root->root_item,
						    root->node);
			}

			err = btrfs_update_root(trans, fs_info->tree_root,
						&root->root_key,
						&root->root_item);
			spin_lock(&fs_info->fs_roots_radix_lock);
			if (err)
				break;
			btrfs_qgroup_free_meta_all(root);
		}
	}
	spin_unlock(&fs_info->fs_roots_radix_lock);
	return err;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
chris mason
chris mason
119
44.57%
9
36.00%
josef bacik
josef bacik
60
22.47%
3
12.00%
zheng yan
zheng yan
48
17.98%
7
28.00%
li zefan
li zefan
15
5.62%
2
8.00%
miao xie
miao xie
7
2.62%
1
4.00%
jeff mahoney
jeff mahoney
7
2.62%
1
4.00%
liu bo
liu bo
6
2.25%
1
4.00%
qu wenruo
qu wenruo
5
1.87%
1
4.00%
Total
267
100.00%
25
100.00%

/*
 * defrag a given btree.
 * Every leaf in the btree is read and defragged.
 */


int btrfs_defrag_root(struct btrfs_root *root)
{
	struct btrfs_fs_info *info = root->fs_info;
	struct btrfs_trans_handle *trans;
	int ret;

	if (test_and_set_bit(BTRFS_ROOT_DEFRAG_RUNNING, &root->state))
		return 0;

	while (1) {
		trans = btrfs_start_transaction(root, 0);
		if (IS_ERR(trans))
			return PTR_ERR(trans);

		ret = btrfs_defrag_leaves(trans, root);

		btrfs_end_transaction(trans);
		btrfs_btree_balance_dirty(info);
		cond_resched();

		if (btrfs_fs_closing(info) || ret != -EAGAIN)
			break;

		if (btrfs_defrag_cancelled(info)) {
			btrfs_debug(info, "defrag_root cancelled");
			ret = -EAGAIN;
			break;
		}
	}
	clear_bit(BTRFS_ROOT_DEFRAG_RUNNING, &root->state);
	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
zheng yan
zheng yan
72
51.43%
4
23.53%
chris mason
chris mason
30
21.43%
8
47.06%
david sterba
david sterba
20
14.29%
2
11.76%
miao xie
miao xie
11
7.86%
1
5.88%
jeff mahoney
jeff mahoney
6
4.29%
1
5.88%
josef bacik
josef bacik
1
0.71%
1
5.88%
Total
140
100.00%
17
100.00%

/*
 * Do all special snapshot related qgroup dirty hack.
 *
 * Will do all needed qgroup inherit and dirty hack like switch commit
 * roots inside one transaction and write all btree into disk, to make
 * qgroup works.
 */


static int qgroup_account_snapshot(struct btrfs_trans_handle *trans,
				   struct btrfs_root *src,
				   struct btrfs_root *parent,
				   struct btrfs_qgroup_inherit *inherit,
				   u64 dst_objectid)
{
	struct btrfs_fs_info *fs_info = src->fs_info;
	int ret;

	/*
         * Save some performance in the case that qgroups are not
         * enabled. If this check races with the ioctl, rescan will
         * kick in anyway.
         */
	mutex_lock(&fs_info->qgroup_ioctl_lock);
	if (!test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags)) {
		mutex_unlock(&fs_info->qgroup_ioctl_lock);
		return 0;
	}
	mutex_unlock(&fs_info->qgroup_ioctl_lock);

	/*
         * We are going to commit transaction, see btrfs_commit_transaction()
         * comment for reason locking tree_log_mutex
         */
	mutex_lock(&fs_info->tree_log_mutex);

	ret = commit_fs_roots(trans, fs_info);
	if (ret)
		goto out;
	ret = btrfs_qgroup_prepare_account_extents(trans, fs_info);
	if (ret < 0)
		goto out;
	ret = btrfs_qgroup_account_extents(trans, fs_info);
	if (ret < 0)
		goto out;

	/* Now qgroup are all updated, we can inherit it to new qgroups */
	ret = btrfs_qgroup_inherit(trans, fs_info,
				   src->root_key.objectid, dst_objectid,
				   inherit);
	if (ret < 0)
		goto out;

	/*
         * Now we do a simplified commit transaction, which will:
         * 1) commit all subvolume and extent tree
         *    To ensure all subvolume and extent tree have a valid
         *    commit_root to accounting later insert_dir_item()
         * 2) write all btree blocks onto disk
         *    This is to make sure later btree modification will be cowed
         *    Or commit_root can be populated and cause wrong qgroup numbers
         * In this simplified commit, we don't really care about other trees
         * like chunk and root tree, as they won't affect qgroup.
         * And we don't write super to avoid half committed status.
         */
	ret = commit_cowonly_roots(trans, fs_info);
	if (ret)
		goto out;
	switch_commit_roots(trans->transaction, fs_info);
	ret = btrfs_write_and_wait_transaction(trans, fs_info);
	if (ret)
		btrfs_handle_fs_error(fs_info, ret,
			"Error while writing out transaction for qgroup");

out:
	mutex_unlock(&fs_info->tree_log_mutex);

	/*
         * Force parent root to be updated, as we recorded it before so its
         * last_trans == cur_transid.
         * Or it won't be committed again onto disk after later
         * insert_dir_item()
         */
	if (!ret)
		record_root_in_trans(trans, parent, 1);
	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
qu wenruo
qu wenruo
239
95.60%
1
16.67%
josef bacik
josef bacik
7
2.80%
1
16.67%
jeff mahoney
jeff mahoney
3
1.20%
3
50.00%
david sterba
david sterba
1
0.40%
1
16.67%
Total
250
100.00%
6
100.00%

/*
 * new snapshots need to be created at a very specific time in the
 * transaction commit.  This does the actual creation.
 *
 * Note:
 * If the error which may affect the commitment of the current transaction
 * happens, we should return the error number. If the error which just affect
 * the creation of the pending snapshots, just return 0.
 */


static noinline int create_pending_snapshot(struct btrfs_trans_handle *trans,
				   struct btrfs_fs_info *fs_info,
				   struct btrfs_pending_snapshot *pending)
{
	struct btrfs_key key;
	struct btrfs_root_item *new_root_item;
	struct btrfs_root *tree_root = fs_info->tree_root;
	struct btrfs_root *root = pending->root;
	struct btrfs_root *parent_root;
	struct btrfs_block_rsv *rsv;
	struct inode *parent_inode;
	struct btrfs_path *path;
	struct btrfs_dir_item *dir_item;
	struct dentry *dentry;
	struct extent_buffer *tmp;
	struct extent_buffer *old;
	struct timespec cur_time;
	int ret = 0;
	u64 to_reserve = 0;
	u64 index = 0;
	u64 objectid;
	u64 root_flags;
	uuid_le new_uuid;

	ASSERT(pending->path);
	path = pending->path;

	ASSERT(pending->root_item);
	new_root_item = pending->root_item;

	pending->error = btrfs_find_free_objectid(tree_root, &objectid);
	if (pending->error)
		goto no_free_objectid;

	/*
         * Make qgroup to skip current new snapshot's qgroupid, as it is
         * accounted by later btrfs_qgroup_inherit().
         */
	btrfs_set_skip_qgroup(trans, objectid);

	btrfs_reloc_pre_snapshot(pending, &to_reserve);

	if (to_reserve > 0) {
		pending->error = btrfs_block_rsv_add(root,
						     &pending->block_rsv,
						     to_reserve,
						     BTRFS_RESERVE_NO_FLUSH);
		if (pending->error)
			goto clear_skip_qgroup;
	}

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

	rsv = trans->block_rsv;
	trans->block_rsv = &pending->block_rsv;
	trans->bytes_reserved = trans->block_rsv->reserved;
	trace_btrfs_space_reservation(fs_info, "transaction",
				      trans->transid,
				      trans->bytes_reserved, 1);
	dentry = pending->dentry;
	parent_inode = pending->dir;
	parent_root = BTRFS_I(parent_inode)->root;
	record_root_in_trans(trans, parent_root, 0);

	cur_time = current_time(parent_inode);

	/*
         * insert the directory item
         */
	ret = btrfs_set_inode_index(parent_inode, &index);
	BUG_ON(ret); /* -ENOMEM */

	/* check if there is a file/dir which has the same name. */
	dir_item = btrfs_lookup_dir_item(NULL, parent_root, path,
					 btrfs_ino(parent_inode),
					 dentry->d_name.name,
					 dentry->d_name.len, 0);
	if (dir_item != NULL && !IS_ERR(dir_item)) {
		pending->error = -EEXIST;
		goto dir_item_existed;
	} else if (IS_ERR(dir_item)) {
		ret = PTR_ERR(dir_item);
		btrfs_abort_transaction(trans, ret);
		goto fail;
	}
	btrfs_release_path(path);

	/*
         * pull in the delayed directory update
         * and the delayed inode item
         * otherwise we corrupt the FS during
         * snapshot
         */
	ret = btrfs_run_delayed_items(trans, fs_info);
	if (ret) {	/* Transaction aborted */
		btrfs_abort_transaction(trans, ret);
		goto fail;
	}

	record_root_in_trans(trans, root, 0);
	btrfs_set_root_last_snapshot(&root->root_item, trans->transid);
	memcpy(new_root_item, &root->root_item, sizeof(*new_root_item));
	btrfs_check_and_init_root_item(new_root_item);

	root_flags = btrfs_root_flags(new_root_item);
	if (pending->readonly)
		root_flags |= BTRFS_ROOT_SUBVOL_RDONLY;
	else
		root_flags &= ~BTRFS_ROOT_SUBVOL_RDONLY;
	btrfs_set_root_flags(new_root_item, root_flags);

	btrfs_set_root_generation_v2(new_root_item,
			trans->transid);
	uuid_le_gen(&new_uuid);
	memcpy(new_root_item->uuid, new_uuid.b, BTRFS_UUID_SIZE);
	memcpy(new_root_item->parent_uuid, root->root_item.uuid,
			BTRFS_UUID_SIZE);
	if (!(root_flags & BTRFS_ROOT_SUBVOL_RDONLY)) {
		memset(new_root_item->received_uuid, 0,
		       sizeof(new_root_item->received_uuid));
		memset(&new_root_item->stime, 0, sizeof(new_root_item->stime));
		memset(&new_root_item->rtime, 0, sizeof(new_root_item->rtime));
		btrfs_set_root_stransid(new_root_item, 0);
		btrfs_set_root_rtransid(new_root_item, 0);
	}
	btrfs_set_stack_timespec_sec(&new_root_item->otime, cur_time.tv_sec);
	btrfs_set_stack_timespec_nsec(&new_root_item->otime, cur_time.tv_nsec);
	btrfs_set_root_otransid(new_root_item, trans->transid);

	old = btrfs_lock_root_node(root);
	ret = btrfs_cow_block(trans, root, old, NULL, 0, &old);
	if (ret) {
		btrfs_tree_unlock(old);
		free_extent_buffer(old);
		btrfs_abort_transaction(trans, ret);
		goto fail;
	}

	btrfs_set_lock_blocking(old);

	ret = btrfs_copy_root(trans, root, old, &tmp, objectid);
	/* clean up in any case */
	btrfs_tree_unlock(old);
	free_extent_buffer(old);
	if (ret) {
		btrfs_abort_transaction(trans, ret);
		goto fail;
	}
	/* see comments in should_cow_block() */
	set_bit(BTRFS_ROOT_FORCE_COW, &root->state);
	smp_wmb();

	btrfs_set_root_node(new_root_item, tmp);
	/* record when the snapshot was created in key.offset */
	key.offset = trans->transid;
	ret = btrfs_insert_root(trans, tree_root, &key, new_root_item);
	btrfs_tree_unlock(tmp);
	free_extent_buffer(tmp);
	if (ret) {
		btrfs_abort_transaction(trans, ret);
		goto fail;
	}

	/*
         * insert root back/forward references
         */
	ret = btrfs_add_root_ref(trans, fs_info, objectid,
				 parent_root->root_key.objectid,
				 btrfs_ino(parent_inode), index,
				 dentry->d_name.name, dentry->d_name.len);
	if (ret) {
		btrfs_abort_transaction(trans, ret);
		goto fail;
	}

	key.offset = (u64)-1;
	pending->snap = btrfs_read_fs_root_no_name(fs_info, &key);
	if (IS_ERR(pending->snap)) {
		ret = PTR_ERR(pending->snap);
		btrfs_abort_transaction(trans, ret);
		goto fail;
	}

	ret = btrfs_reloc_post_snapshot(trans, pending);
	if (ret) {
		btrfs_abort_transaction(trans, ret);
		goto fail;
	}

	ret = btrfs_run_delayed_refs(trans, fs_info, (unsigned long)-1);
	if (ret) {
		btrfs_abort_transaction(trans, ret);
		goto fail;
	}

	/*
         * Do special qgroup accounting for snapshot, as we do some qgroup
         * snapshot hack to do fast snapshot.
         * To co-operate with that hack, we do hack again.
         * Or snapshot will be greatly slowed down by a subtree qgroup rescan
         */
	ret = qgroup_account_snapshot(trans, root, parent_root,
				      pending->inherit, objectid);
	if (ret < 0)
		goto fail;

	ret = btrfs_insert_dir_item(trans, parent_root,
				    dentry->d_name.name, dentry->d_name.len,
				    parent_inode, &key,
				    BTRFS_FT_DIR, index);
	/* We have check then name at the beginning, so it is impossible. */
	BUG_ON(ret == -EEXIST || ret == -EOVERFLOW);
	if (ret) {
		btrfs_abort_transaction(trans, ret);
		goto fail;
	}

	btrfs_i_size_write(parent_inode, parent_inode->i_size +
					 dentry->d_name.len * 2);
	parent_inode->i_mtime = parent_inode->i_ctime =
		current_time(parent_inode);
	ret = btrfs_update_inode_fallback(trans, parent_root, parent_inode);
	if (ret) {
		btrfs_abort_transaction(trans, ret);
		goto fail;
	}
	ret = btrfs_uuid_tree_add(trans, fs_info, new_uuid.b,
				  BTRFS_UUID_KEY_SUBVOL, objectid);
	if (ret) {
		btrfs_abort_transaction(trans, ret);
		goto fail;
	}
	if (!btrfs_is_empty_uuid(new_root_item->received_uuid)) {
		ret = btrfs_uuid_tree_add(trans, fs_info,
					  new_root_item->received_uuid,
					  BTRFS_UUID_KEY_RECEIVED_SUBVOL,
					  objectid);
		if (ret && ret != -EEXIST) {
			btrfs_abort_transaction(trans, ret);
			goto fail;
		}
	}

	ret = btrfs_run_delayed_refs(trans, fs_info, (unsigned long)-1);
	if (ret) {
		btrfs_abort_transaction(trans, ret);
		goto fail;
	}

fail:
	pending->error = ret;
dir_item_existed:
	trans->block_rsv = rsv;
	trans->bytes_reserved = 0;
clear_skip_qgroup:
	btrfs_clear_skip_qgroup(trans);
no_free_objectid:
	kfree(new_root_item);
	pending->root_item = NULL;
	btrfs_free_path(path);
	pending->path = NULL;

	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
miao xie
miao xie
306
23.25%
8
16.00%
chris mason
chris mason
279
21.20%
11
22.00%
zheng yan
zheng yan
174
13.22%
7
14.00%
stefan behrens
stefan behrens
132
10.03%
2
4.00%
alexander block
alexander block
106
8.05%
1
2.00%
qu wenruo
qu wenruo
86
6.53%
3
6.00%
jeff mahoney
jeff mahoney
80
6.08%
4
8.00%
li zefan
li zefan
41
3.12%
3
6.00%
liu bo
liu bo
31
2.36%
3
6.00%
david sterba
david sterba
25
1.90%
2
4.00%
sage weil
sage weil
24
1.82%
1
2.00%
josef bacik
josef bacik
21
1.60%
3
6.00%
deepa dinamani
deepa dinamani
11
0.84%
2
4.00%
Total
1316
100.00%
50
100.00%

/*
 * create all the snapshots we've scheduled for creation
 */


static noinline int create_pending_snapshots(struct btrfs_trans_handle *trans,
					     struct btrfs_fs_info *fs_info)
{
	struct btrfs_pending_snapshot *pending, *next;
	struct list_head *head = &trans->transaction->pending_snapshots;
	int ret = 0;

	list_for_each_entry_safe(pending, next, head, list) {
		list_del(&pending->list);
		ret = create_pending_snapshot(trans, fs_info, pending);
		if (ret)
			break;
	}
	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
chris mason
chris mason
44
54.32%
2
33.33%
miao xie
miao xie
29
35.80%
1
16.67%
sven wegener
sven wegener
5
6.17%
1
16.67%
qinghuang feng
qinghuang feng
2
2.47%
1
16.67%
josef bacik
josef bacik
1
1.23%
1
16.67%
Total
81
100.00%
6
100.00%



static void update_super_roots(struct btrfs_fs_info *fs_info)
{
	struct btrfs_root_item *root_item;
	struct btrfs_super_block *super;

	super = fs_info->super_copy;

	root_item = &fs_info->chunk_root->root_item;
	super->chunk_root = root_item->bytenr;
	super->chunk_root_generation = root_item->generation;
	super->chunk_root_level = root_item->level;

	root_item = &fs_info->tree_root->root_item;
	super->root = root_item->bytenr;
	super->generation = root_item->generation;
	super->root_level = root_item->level;
	if (btrfs_test_opt(fs_info, SPACE_CACHE))
		super->cache_generation = root_item->generation;
	if (test_bit(BTRFS_FS_UPDATE_UUID_TREE_GEN, &fs_info->flags))
		super->uuid_tree_generation = root_item->generation;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
zheng yan
zheng yan
81
62.31%
1
11.11%
josef bacik
josef bacik
23
17.69%
2
22.22%
stefan behrens
stefan behrens
13
10.00%
2
22.22%
jeff mahoney
jeff mahoney
7
5.38%
3
33.33%
chris mason
chris mason
6
4.62%
1
11.11%
Total
130
100.00%
9
100.00%



int btrfs_transaction_in_commit(struct btrfs_fs_info *info)
{
	struct btrfs_transaction *trans;
	int ret = 0;

	spin_lock(&info->trans_lock);
	trans = info->running_transaction;
	if (trans)
		ret = (trans->state >= TRANS_STATE_COMMIT_START);
	spin_unlock(&info->trans_lock);
	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
chris mason
chris mason
40
67.80%
1
33.33%
miao xie
miao xie
17
28.81%
1
33.33%
josef bacik
josef bacik
2
3.39%
1
33.33%
Total
59
100.00%
3
100.00%



int btrfs_transaction_blocked(struct btrfs_fs_info *info)
{
	struct btrfs_transaction *trans;
	int ret = 0;

	spin_lock(&info->trans_lock);
	trans = info->running_transaction;
	if (trans)
		ret = is_transaction_blocked(trans);
	spin_unlock(&info->trans_lock);
	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
zheng yan
zheng yan
39
69.64%
1
33.33%
miao xie
miao xie
15
26.79%
1
33.33%
josef bacik
josef bacik
2
3.57%
1
33.33%
Total
56
100.00%
3
100.00%

/*
 * wait for the current transaction commit to start and block subsequent
 * transaction joins
 */


static void wait_current_trans_commit_start(struct btrfs_fs_info *fs_info,
					    struct btrfs_transaction *trans)
{
	wait_event(fs_info->transaction_blocked_wait,
		   trans->state >= TRANS_STATE_COMMIT_START || trans->aborted);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
sage weil
sage weil
23
69.70%
1
20.00%
josef bacik
josef bacik
4
12.12%
1
20.00%
miao xie
miao xie
3
9.09%
1
20.00%
jeff mahoney
jeff mahoney
2
6.06%
1
20.00%
li zefan
li zefan
1
3.03%
1
20.00%
Total
33
100.00%
5
100.00%

/*
 * wait for the current transaction to start and then become unblocked.
 * caller holds ref.
 */


static void wait_current_trans_commit_start_and_unblock(
					struct btrfs_fs_info *fs_info,
					struct btrfs_transaction *trans)
{
	wait_event(fs_info->transaction_wait,
		   trans->state >= TRANS_STATE_UNBLOCKED || trans->aborted);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
sage weil
sage weil
23
69.70%
1
20.00%
josef bacik
josef bacik
4
12.12%
1
20.00%
miao xie
miao xie
3
9.09%
1
20.00%
jeff mahoney
jeff mahoney
2
6.06%
1
20.00%
li zefan
li zefan
1
3.03%
1
20.00%
Total
33
100.00%
5
100.00%

/*
 * commit transactions asynchronously. once btrfs_commit_transaction_async
 * returns, any subsequent transaction will not be allowed to join.
 */

struct btrfs_async_commit {
	
struct btrfs_trans_handle *newtrans;
	
struct work_struct work;
};



static void do_async_commit(struct work_struct *work)
{
	struct btrfs_async_commit *ac =
		container_of(work, struct btrfs_async_commit, work);

	/*
         * We've got freeze protection passed with the transaction.
         * Tell lockdep about it.
         */
	if (ac->newtrans->type & __TRANS_FREEZABLE)
		__sb_writers_acquired(ac->newtrans->fs_info->sb, SB_FREEZE_FS);

	current->journal_info = ac->newtrans;

	btrfs_commit_transaction(ac->newtrans);
	kfree(ac);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
sage weil
sage weil
57
81.43%
3
42.86%
miao xie
miao xie
8
11.43%
1
14.29%
liu bo
liu bo
2
2.86%
1
14.29%
oleg nesterov
oleg nesterov
2
2.86%
1
14.29%
jeff mahoney
jeff mahoney
1
1.43%
1
14.29%
Total
70
100.00%
7
100.00%



int btrfs_commit_transaction_async(struct btrfs_trans_handle *trans,
				   int wait_for_unblock)
{
	struct btrfs_fs_info *fs_info = trans->fs_info;
	struct btrfs_async_commit *ac;
	struct btrfs_transaction *cur_trans;

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

	INIT_WORK(&ac->work, do_async_commit);
	ac->newtrans = btrfs_join_transaction(trans->root);
	if (IS_ERR(ac->newtrans)) {
		int err = PTR_ERR(ac->newtrans);
		kfree(ac);
		return err;
	}

	/* take transaction reference */
	cur_trans = trans->transaction;
	atomic_inc(&cur_trans->use_count);

	btrfs_end_transaction(trans);

	/*
         * Tell lockdep we've released the freeze rwsem, since the
         * async commit thread will be the one to unlock it.
         */
	if (ac->newtrans->type & __TRANS_FREEZABLE)
		__sb_writers_release(fs_info->sb, SB_FREEZE_FS);

	schedule_work(&ac->work);

	/* wait for transaction to start and unblock */
	if (wait_for_unblock)
		wait_current_trans_commit_start_and_unblock(fs_info, cur_trans);
	else
		wait_current_trans_commit_start(fs_info, cur_trans);

	if (current->journal_info == trans)
		current->journal_info = NULL;

	btrfs_put_transaction(cur_trans);
	return 0;
}


Contributors
Person
Tokens
Prop
Commits
CommitProp
sage weil
sage weil
126
64.95%
3
21.43%
tsutomu itoh
tsutomu itoh
36
18.56%
2
14.29%
jeff mahoney
jeff mahoney
13
6.70%
3
21.43%
miao xie
miao xie
7
3.61%
2
14.29%
josef bacik
josef bacik
5
2.58%
2
14.29%
liu bo
liu bo
5
2.58%
1
7.14%
oleg nesterov
oleg nesterov
2
1.03%
1
7.14%
Total
194
100.00%
14
100.00%



static void cleanup_transaction(struct btrfs_trans_handle *trans,
				struct btrfs_root *root, int err)
{
	struct btrfs_fs_info *fs_info = root->fs_info;
	struct btrfs_transaction *cur_trans = trans->transaction;
	DEFINE_WAIT(wait);

	WARN_ON(trans->use_count > 1);

	btrfs_abort_transaction(trans, err);

	spin_lock(&fs_info->trans_lock);

	/*
         * If the transaction is removed from the list, it means this
         * transaction has been committed successfully, so it is impossible
         * to call the cleanup function.
         */
	BUG_ON(list_empty(&cur_trans->list));

	list_del_init(&cur_trans->list);
	if (cur_trans == fs_info->running_transaction) {
		cur_trans->state = TRANS_STATE_COMMIT_DOING;
		spin_unlock(&fs_info->trans_lock);
		wait_event(cur_trans->writer_wait,
			   atomic_read(&cur_trans->num_writers) == 1);

		spin_lock(&fs_info->trans_lock);
	}
	spin_unlock(&fs_info->trans_lock);

	btrfs_cleanup_one_transaction(trans->transaction, fs_info);

	spin_lock(&fs_info->trans_lock);
	if (cur_trans == fs_info->running_transaction)
		fs_info->running_transaction = NULL;
	spin_unlock(&fs_info->trans_lock);

	if (trans->type & __TRANS_FREEZABLE)
		sb_end_intwrite(fs_info->sb);
	btrfs_put_transaction(cur_trans);
	btrfs_put_transaction(cur_trans);

	trace_btrfs_transaction_commit(root);

	if (current->journal_info == trans)
		current->journal_info = NULL;
	btrfs_scrub_cancel(fs_info);

	kmem_cache_free(btrfs_trans_handle_cachep, trans);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
jeff mahoney
jeff mahoney
93
39.08%
3
21.43%
liu bo
liu bo
45
18.91%
2
14.29%
josef bacik
josef bacik
42
17.65%
4
28.57%
miao xie
miao xie
36
15.13%
2
14.29%
chris mason
chris mason
17
7.14%
2
14.29%
wang shilong
wang shilong
5
2.10%
1
7.14%
Total
238
100.00%
14
100.00%



static inline int btrfs_start_delalloc_flush(struct btrfs_fs_info *fs_info)
{
	if (btrfs_test_opt(fs_info, FLUSHONCOMMIT))
		return btrfs_start_delalloc_roots(fs_info, 1, -1);
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
miao xie
miao xie
35
100.00%
3
100.00%
Total
35
100.00%
3
100.00%



static inline void btrfs_wait_delalloc_flush(struct btrfs_fs_info *fs_info)
{
	if (btrfs_test_opt(fs_info, FLUSHONCOMMIT))
		btrfs_wait_ordered_roots(fs_info, -1, 0, (u64)-1);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
miao xie
miao xie
29
78.38%
2
66.67%
filipe david borba manana
filipe david borba manana
8
21.62%
1
33.33%
Total
37
100.00%
3
100.00%


static inline void

btrfs_wait_pending_ordered(struct btrfs_transaction *cur_trans)
{
	wait_event(cur_trans->pending_wait,
		   atomic_read(&cur_trans->pending_ordered) == 0);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
josef bacik
josef bacik
29
100.00%
2
100.00%
Total
29
100.00%
2
100.00%



int btrfs_commit_transaction(struct btrfs_trans_handle *trans)
{
	struct btrfs_fs_info *fs_info = trans->fs_info;
	struct btrfs_transaction *cur_trans = trans->transaction;
	struct btrfs_transaction *prev_trans = NULL;
	int ret;

	/* Stop the commit early if ->aborted is set */
	if (unlikely(ACCESS_ONCE(cur_trans->aborted))) {
		ret = cur_trans->aborted;
		btrfs_end_transaction(trans);
		return ret;
	}

	/* make a pass through all the delayed refs we have so far
         * any runnings procs may add more while we are here
         */
	ret = btrfs_run_delayed_refs(trans, fs_info, 0);
	if (ret) {
		btrfs_end_transaction(trans);
		return ret;
	}

	btrfs_trans_release_metadata(trans, fs_info);
	trans->block_rsv = NULL;

	cur_trans = trans->transaction;

	/*
         * set the flushing flag so procs in this transaction have to
         * start sending their work down.
         */
	cur_trans->delayed_refs.flushing = 1;
	smp_wmb();

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

	ret = btrfs_run_delayed_refs(trans, fs_info, 0);
	if (ret) {
		btrfs_end_transaction(trans);
		return ret;
	}

	if (!test_bit(BTRFS_TRANS_DIRTY_BG_RUN, &cur_trans->flags)) {
		int run_it = 0;

		/* this mutex is also taken before trying to set
                 * block groups readonly.  We need to make sure
                 * that nobody has set a block group readonly
                 * after a extents from that block group have been
                 * allocated for cache files.  btrfs_set_block_group_ro
                 * will wait for the transaction to commit if it
                 * finds BTRFS_TRANS_DIRTY_BG_RUN set.
                 *
                 * The BTRFS_TRANS_DIRTY_BG_RUN flag is also used to make sure
                 * only one process starts all the block group IO.  It wouldn't
                 * hurt to have more than one go through, but there's no
                 * real advantage to it either.
                 */
		mutex_lock(&fs_info->ro_block_group_mutex);
		if (!test_and_set_bit(BTRFS_TRANS_DIRTY_BG_RUN,
				      &cur_trans->flags))
			run_it = 1;
		mutex_unlock(&fs_info->ro_block_group_mutex);

		if (run_it)
			ret = btrfs_start_dirty_block_groups(trans, fs_info);
	}
	if (ret) {
		btrfs_end_transaction(trans);
		return ret;
	}

	spin_lock(&fs_info->trans_lock);
	if (cur_trans->state >= TRANS_STATE_COMMIT_START) {
		spin_unlock(&fs_info->trans_lock);
		atomic_inc(&cur_trans->use_count);
		ret = btrfs_end_transaction(trans);

		wait_for_commit(cur_trans);

		if (unlikely(cur_trans->aborted))
			ret = cur_trans->aborted;

		btrfs_put_transaction(cur_trans);

		return ret;
	}

	cur_trans->state = TRANS_STATE_COMMIT_START;
	wake_up(&fs_info->transaction_blocked_wait);

	if (cur_trans->list.prev != &fs_info->trans_list) {
		prev_trans = list_entry(cur_trans->list.prev,
					struct btrfs_transaction, list);
		if (prev_trans->state != TRANS_STATE_COMPLETED) {
			atomic_inc(&prev_trans->use_count);
			spin_unlock(&fs_info->trans_lock);

			wait_for_commit(prev_trans);
			ret = prev_trans->aborted;

			btrfs_put_transaction(prev_trans);
			if (ret)
				goto cleanup_transaction;
		} else {
			spin_unlock(&fs_info->trans_lock);
		}
	} else {
		spin_unlock(&fs_info->trans_lock);
	}

	extwriter_counter_dec(cur_trans, trans->type);

	ret = btrfs_start_delalloc_flush(fs_info);
	if (ret)
		goto cleanup_transaction;

	ret = btrfs_run_delayed_items(trans, fs_info);
	if (ret)
		goto cleanup_transaction;

	wait_event(cur_trans->writer_wait,
		   extwriter_counter_read(cur_trans) == 0);

	/* some pending stuffs might be added after the previous flush. */
	ret = btrfs_run_delayed_items(trans, fs_info);
	if (ret)
		goto cleanup_transaction;

	btrfs_wait_delalloc_flush(fs_info);

	btrfs_wait_pending_ordered(cur_trans);

	btrfs_scrub_pause(fs_info);
	/*
         * Ok now we need to make sure to block out any other joins while we
         * commit the transaction.  We could have started a join before setting
         * COMMIT_DOING so make sure to wait for num_writers to == 1 again.
         */
	spin_lock(&fs_info->trans_lock);
	cur_trans->state = TRANS_STATE_COMMIT_DOING;
	spin_unlock(&fs_info->trans_lock);
	wait_event(cur_trans->writer_wait,
		   atomic_read(&cur_trans->num_writers) == 1);

	/* ->aborted might be set after the previous check, so check it */
	if (unlikely(ACCESS_ONCE(cur_trans->aborted))) {
		ret = cur_trans->aborted;
		goto scrub_continue;
	}
	/*
         * the reloc mutex makes sure that we stop
         * the balancing code from coming in and moving
         * extents around in the middle of the commit
         */
	mutex_lock(&fs_info->reloc_mutex);

	/*
         * We needn't worry about the delayed items because we will
         * deal with them in create_pending_snapshot(), which is the
         * core function of the snapshot creation.
         */
	ret = create_pending_snapshots(trans, fs_info);
	if (ret) {
		mutex_unlock(&fs_info->reloc_mutex);
		goto scrub_continue;
	}

	/*
         * We insert the dir indexes of the snapshots and update the inode
         * of the snapshots' parents after the snapshot creation, so there
         * are some delayed items which are not dealt with. Now deal with
         * them.
         *
         * We needn't worry that this operation will corrupt the snapshots,
         * because all the tree which are snapshoted will be forced to COW
         * the nodes and leaves.
         */
	ret = btrfs_run_delayed_items(trans, fs_info);
	if (ret) {
		mutex_unlock(&fs_info->reloc_mutex);
		goto scrub_continue;
	}

	ret = btrfs_run_delayed_refs(trans, fs_info, (unsigned long)-1);
	if (ret) {
		mutex_unlock(&fs_info->reloc_mutex);
		goto scrub_continue;
	}

	/* Reocrd old roots for later qgroup accounting */
	ret = btrfs_qgroup_prepare_account_extents(trans, fs_info);
	if (ret) {
		mutex_unlock(&fs_info->reloc_mutex);
		goto scrub_continue;
	}

	/*
         * make sure none of the code above managed to slip in a
         * delayed item
         */
	btrfs_assert_delayed_root_empty(fs_info);

	WARN_ON(cur_trans != trans->transaction);

	/* btrfs_commit_tree_roots is responsible for getting the
         * various roots consistent with each other.  Every pointer
         * in the tree of tree roots has to point to the most up to date
         * root for every subvolume and other tree.  So, we have to keep
         * the tree logging code from jumping in and changing any
         * of the trees.
         *
         * At this point in the commit, there can't be any tree-log
         * writers, but a little lower down we drop the trans mutex
         * and let new people in.  By holding the tree_log_mutex
         * from now until after the super is written, we avoid races
         * with the tree-log code.
         */
	mutex_lock(&fs_info->tree_log_mutex);

	ret = commit_fs_roots(trans, fs_info);
	if (ret) {
		mutex_unlock(&fs_info->tree_log_mutex);
		mutex_unlock(&fs_info->reloc_mutex);
		goto scrub_continue;
	}

	/*
         * Since the transaction is done, we can apply the pending changes
         * before the next transaction.
         */
	btrfs_apply_pending_changes(fs_info);

	/* commit_fs_roots gets rid of all the tree log roots, it is now
         * safe to free the root of tree log roots
         */
	btrfs_free_log_root_tree(trans, fs_info);

	/*
         * Since fs roots are all committed, we can get a quite accurate
         * new_roots. So let's do quota accounting.
         */
	ret = btrfs_qgroup_account_extents(trans, fs_info);
	if (ret < 0) {
		mutex_unlock(&fs_info->tree_log_mutex);
		mutex_unlock(&fs_info->reloc_mutex);
		goto scrub_continue;
	}

	ret = commit_cowonly_roots(trans, fs_info);
	if (ret) {
		mutex_unlock(&fs_info->tree_log_mutex);
		mutex_unlock(&fs_info->reloc_mutex);
		goto scrub_continue;
	}

	/*
         * The tasks which save the space cache and inode cache may also
         * update ->aborted, check it.
         */
	if (unlikely(ACCESS_ONCE(cur_trans->aborted))) {
		ret = cur_trans->aborted;
		mutex_unlock(&fs_info->tree_log_mutex);
		mutex_unlock(&fs_info->reloc_mutex);
		goto scrub_continue;
	}

	btrfs_prepare_extent_commit(trans, fs_info);

	cur_trans = fs_info->running_transaction;

	btrfs_set_root_node(&fs_info->tree_root->root_item,
			    fs_info->tree_root->node);
	list_add_tail(&fs_info->tree_root->dirty_list,
		      &cur_trans->switch_commits);

	btrfs_set_root_node(&fs_info->chunk_root->root_item,
			    fs_info->chunk_root->node);
	list_add_tail(&fs_info->chunk_root->dirty_list,
		      &cur_trans->switch_commits);

	switch_commit_roots(cur_trans, fs_info);

	assert_qgroups_uptodate(trans);
	ASSERT(list_empty(&cur_trans->dirty_bgs));
	ASSERT(list_empty(&cur_trans->io_bgs));
	update_super_roots(fs_info);

	btrfs_set_super_log_root(fs_info->super_copy, 0);
	btrfs_set_super_log_root_level(fs_info->super_copy, 0);
	memcpy(fs_info->super_for_commit, fs_info->super_copy,
	       sizeof(*fs_info->super_copy));

	btrfs_update_commit_device_size(fs_info);
	btrfs_update_commit_device_bytes_used(fs_info, cur_trans);

	clear_bit(BTRFS_FS_LOG1_ERR, &fs_info->flags);
	clear_bit(BTRFS_FS_LOG2_ERR, &fs_info->flags);

	btrfs_trans_release_chunk_metadata(trans);

	spin_lock(&fs_info->trans_lock);
	cur_trans->state = TRANS_STATE_UNBLOCKED;
	fs_info->running_transaction = NULL;
	spin_unlock(&fs_info->trans_lock);
	mutex_unlock(&fs_info->reloc_mutex);

	wake_up(&fs_info->transaction_wait);

	ret = btrfs_write_and_wait_transaction(trans, fs_info);
	if (ret) {
		btrfs_handle_fs_error(fs_info, ret,
				      "Error while writing out transaction");
		mutex_unlock(&fs_info->tree_log_mutex);
		goto scrub_continue;
	}

	ret = write_ctree_super(trans, fs_info, 0);
	if (ret) {
		mutex_unlock(&fs_info->tree_log_mutex);
		goto scrub_continue;
	}

	/*
         * the super is written, we can safely allow the tree-loggers
         * to go about their business
         */
	mutex_unlock(&fs_info->tree_log_mutex);

	btrfs_finish_extent_commit(trans, fs_info);

	if (test_bit(BTRFS_TRANS_HAVE_FREE_BGS, &cur_trans->flags))
		btrfs_clear_space_info_full(fs_info);

	fs_info->last_trans_committed = cur_trans->transid;
	/*
         * We needn't acquire the lock here because there is no other task
         * which can change it.
         */
	cur_trans->state = TRANS_STATE_COMPLETED;
	wake_up(&cur_trans->commit_wait);

	spin_lock(&fs_info->trans_lock);
	list_del_init(&cur_trans->list);
	spin_unlock(&fs_info->trans_lock);

	btrfs_put_transaction(cur_trans);
	btrfs_put_transaction(cur_trans);

	if (trans->type & __TRANS_FREEZABLE)
		sb_end_intwrite(fs_info->sb);

	trace_btrfs_transaction_commit(trans->root);

	btrfs_scrub_continue(fs_info);

	if (current->journal_info == trans)
		current->journal_info = NULL;

	kmem_cache_free(btrfs_trans_handle_cachep, trans);

	/*
         * If fs has been frozen, we can not handle delayed iputs, otherwise
         * it'll result in deadlock about SB_FREEZE_FS.
         */
	if (current != fs_info->transaction_kthread &&
	    current != fs_info->cleaner_kthread && !fs_info->fs_frozen)
		btrfs_run_delayed_iputs(fs_info);

	return ret;

scrub_continue:
	btrfs_scrub_continue(fs_info);
cleanup_transaction:
	btrfs_trans_release_metadata(trans, fs_info);
	btrfs_trans_release_chunk_metadata(trans);
	trans->block_rsv = NULL;
	btrfs_warn(fs_info, "Skipping commit of aborted transaction.");
	if (current->journal_info == trans)
		current->journal_info = NULL;
	cleanup_transaction(trans, trans->root, ret);

	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
chris mason
chris mason
457
32.39%
24
26.67%
josef bacik
josef bacik
265
18.78%
15
16.67%
jeff mahoney
jeff mahoney
212
15.02%
7
7.78%
miao xie
miao xie
198
14.03%
14
15.56%
qu wenruo
qu wenruo
68
4.82%
2
2.22%
zheng yan
zheng yan
52
3.69%
6
6.67%
filipe david borba manana
filipe david borba manana
36
2.55%
3
3.33%
david sterba
david sterba
20
1.42%
5
5.56%
wang shilong
wang shilong
19
1.35%
2
2.22%
liu bo
liu bo
18
1.28%
2
2.22%
josef whiter
josef whiter
17
1.20%
1
1.11%
zhao lei
zhao lei
16
1.13%
2
2.22%
sage weil
sage weil
8
0.57%
1
1.11%
jan kara
jan kara
7
0.50%
1
1.11%
wang xiaoguang
wang xiaoguang
6
0.43%
1
1.11%
jan schmidt
jan schmidt
5
0.35%
1
1.11%
arne jansen
arne jansen
4
0.28%
1
1.11%
simon kirby
simon kirby
2
0.14%
1
1.11%
anand jain
anand jain
1
0.07%
1
1.11%
Total
1411
100.00%
90
100.00%

/*
 * return < 0 if error
 * 0 if there are no more dead_roots at the time of call
 * 1 there are more to be processed, call me again
 *
 * The return value indicates there are certainly more snapshots to delete, but
 * if there comes a new one during processing, it may return 0. We don't mind,
 * because btrfs_commit_super will poke cleaner thread and it will process it a
 * few seconds later.
 */


int btrfs_clean_one_deleted_snapshot(struct btrfs_root *root)
{
	int ret;
	struct btrfs_fs_info *fs_info = root->fs_info;

	spin_lock(&fs_info->trans_lock);
	if (list_empty(&fs_info->dead_roots)) {
		spin_unlock(&fs_info->trans_lock);
		return 0;
	}
	root = list_first_entry(&fs_info->dead_roots,
			struct btrfs_root, root_list);
	list_del_init(&root->root_list);
	spin_unlock(&fs_info->trans_lock);

	btrfs_debug(fs_info, "cleaner removing %llu", root->objectid);

	btrfs_kill_all_delayed_nodes(root);

	if (btrfs_header_backref_rev(root->node) <
			BTRFS_MIXED_BACKREF_REV)
		ret = btrfs_drop_snapshot(root, NULL, 0, 0);
	else
		ret = btrfs_drop_snapshot(root, NULL, 1, 0);

	return (ret < 0) ? 0 : 1;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
zheng yan
zheng yan
51
34.23%
4
30.77%
david sterba
david sterba
34
22.82%
1
7.69%
chris mason
chris mason
33
22.15%
1
7.69%
jeff mahoney
jeff mahoney
11
7.38%
2
15.38%
josef bacik
josef bacik
11
7.38%
3
23.08%
miao xie
miao xie
5
3.36%
1
7.69%
arne jansen
arne jansen
4
2.68%
1
7.69%
Total
149
100.00%
13
100.00%



void btrfs_apply_pending_changes(struct btrfs_fs_info *fs_info)
{
	unsigned long prev;
	unsigned long bit;

	prev = xchg(&fs_info->pending_changes, 0);
	if (!prev)
		return;

	bit = 1 << BTRFS_PENDING_SET_INODE_MAP_CACHE;
	if (prev & bit)
		btrfs_set_opt(fs_info->mount_opt, INODE_MAP_CACHE);
	prev &= ~bit;

	bit = 1 << BTRFS_PENDING_CLEAR_INODE_MAP_CACHE;
	if (prev & bit)
		btrfs_clear_opt(fs_info->mount_opt, INODE_MAP_CACHE);
	prev &= ~bit;

	bit = 1 << BTRFS_PENDING_COMMIT;
	if (prev & bit)
		btrfs_debug(fs_info, "pending commit done");
	prev &= ~bit;

	if (prev)
		btrfs_warn(fs_info,
			"unknown pending changes left 0x%lx, ignoring", prev);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
david sterba
david sterba
124
99.20%
3
75.00%
qu wenruo
qu wenruo
1
0.80%
1
25.00%
Total
125
100.00%
4
100.00%

Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
chris mason
chris mason
2186
22.30%
71
22.47%
josef bacik
josef bacik
1875
19.12%
59
18.67%
miao xie
miao xie
1458
14.87%
37
11.71%
zheng yan
zheng yan
927
9.46%
24
7.59%
jeff mahoney
jeff mahoney
873
8.90%
17
5.38%
filipe david borba manana
filipe david borba manana
536
5.47%
11
3.48%
sage weil
sage weil
451
4.60%
9
2.85%
qu wenruo
qu wenruo
420
4.28%
8
2.53%
david sterba
david sterba
244
2.49%
17
5.38%
stefan behrens
stefan behrens
176
1.80%
6
1.90%
liu bo
liu bo
131
1.34%
11
3.48%
alexander block
alexander block
109
1.11%
1
0.32%
jan schmidt
jan schmidt
81
0.83%
4
1.27%
li zefan
li zefan
64
0.65%
7
2.22%
arne jansen
arne jansen
60
0.61%
6
1.90%
tsutomu itoh
tsutomu itoh
48
0.49%
2
0.63%
alexandru moise
alexandru moise
26
0.27%
4
1.27%
wang shilong
wang shilong
26
0.27%
4
1.27%
zhao lei
zhao lei
20
0.20%
2
0.63%
josef whiter
josef whiter
19
0.19%
1
0.32%
dave jones
dave jones
17
0.17%
1
0.32%
jan kara
jan kara
14
0.14%
1
0.32%
deepa dinamani
deepa dinamani
11
0.11%
2
0.63%
wang xiaoguang
wang xiaoguang
6
0.06%
1
0.32%
julia lawall
julia lawall
6
0.06%
1
0.32%
sven wegener
sven wegener
5
0.05%
1
0.32%
oleg nesterov
oleg nesterov
4
0.04%
1
0.32%
tejun heo
tejun heo
3
0.03%
1
0.32%
qinghuang feng
qinghuang feng
2
0.02%
1
0.32%
simon kirby
simon kirby
2
0.02%
1
0.32%
eric sandeen
eric sandeen
1
0.01%
1
0.32%
wang sheng-hui
wang sheng-hui
1
0.01%
1
0.32%
sergei trofimovich
sergei trofimovich
1
0.01%
1
0.32%
anand jain
anand jain
1
0.01%
1
0.32%
Total
9804
100.00%
316
100.00%
Directory: fs/btrfs

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