cregit-Linux how code gets into the kernel

Release 4.10 fs/ocfs2/localalloc.c

Directory: fs/ocfs2
/* -*- mode: c; c-basic-offset: 8; -*-
 * vim: noexpandtab sw=8 ts=8 sts=0:
 *
 * localalloc.c
 *
 * Node local data allocation
 *
 * Copyright (C) 2002, 2004 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 as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * 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/types.h>
#include <linux/slab.h>
#include <linux/highmem.h>
#include <linux/bitops.h>

#include <cluster/masklog.h>

#include "ocfs2.h"

#include "alloc.h"
#include "blockcheck.h"
#include "dlmglue.h"
#include "inode.h"
#include "journal.h"
#include "localalloc.h"
#include "suballoc.h"
#include "super.h"
#include "sysfile.h"
#include "ocfs2_trace.h"

#include "buffer_head_io.h"


#define OCFS2_LOCAL_ALLOC(dinode)	(&((dinode)->id2.i_lab))

static u32 ocfs2_local_alloc_count_bits(struct ocfs2_dinode *alloc);

static int ocfs2_local_alloc_find_clear_bits(struct ocfs2_super *osb,
					     struct ocfs2_dinode *alloc,
					     u32 *numbits,
					     struct ocfs2_alloc_reservation *resv);

static void ocfs2_clear_local_alloc(struct ocfs2_dinode *alloc);

static int ocfs2_sync_local_to_main(struct ocfs2_super *osb,
				    handle_t *handle,
				    struct ocfs2_dinode *alloc,
				    struct inode *main_bm_inode,
				    struct buffer_head *main_bm_bh);

static int ocfs2_local_alloc_reserve_for_window(struct ocfs2_super *osb,
						struct ocfs2_alloc_context **ac,
						struct inode **bitmap_inode,
						struct buffer_head **bitmap_bh);

static int ocfs2_local_alloc_new_window(struct ocfs2_super *osb,
					handle_t *handle,
					struct ocfs2_alloc_context *ac);

static int ocfs2_local_alloc_slide_window(struct ocfs2_super *osb,
					  struct inode *local_alloc_inode);

/*
 * ocfs2_la_default_mb() - determine a default size, in megabytes of
 * the local alloc.
 *
 * Generally, we'd like to pick as large a local alloc as
 * possible. Performance on large workloads tends to scale
 * proportionally to la size. In addition to that, the reservations
 * code functions more efficiently as it can reserve more windows for
 * write.
 *
 * Some things work against us when trying to choose a large local alloc:
 *
 * - We need to ensure our sizing is picked to leave enough space in
 *   group descriptors for other allocations (such as block groups,
 *   etc). Picking default sizes which are a multiple of 4 could help
 *   - block groups are allocated in 2mb and 4mb chunks.
 *
 * - Likewise, we don't want to starve other nodes of bits on small
 *   file systems. This can easily be taken care of by limiting our
 *   default to a reasonable size (256M) on larger cluster sizes.
 *
 * - Some file systems can't support very large sizes - 4k and 8k in
 *   particular are limited to less than 128 and 256 megabytes respectively.
 *
 * The following reference table shows group descriptor and local
 * alloc maximums at various cluster sizes (4k blocksize)
 *
 * csize: 4K    group: 126M     la: 121M
 * csize: 8K    group: 252M     la: 243M
 * csize: 16K   group: 504M     la: 486M
 * csize: 32K   group: 1008M    la: 972M
 * csize: 64K   group: 2016M    la: 1944M
 * csize: 128K  group: 4032M    la: 3888M
 * csize: 256K  group: 8064M    la: 7776M
 * csize: 512K  group: 16128M   la: 15552M
 * csize: 1024K group: 32256M   la: 31104M
 */

#define	OCFS2_LA_MAX_DEFAULT_MB	256

#define	OCFS2_LA_OLD_DEFAULT	8



unsigned int ocfs2_la_default_mb(struct ocfs2_super *osb)
{
	unsigned int la_mb;
	unsigned int gd_mb;
	unsigned int la_max_mb;
	unsigned int megs_per_slot;
	struct super_block *sb = osb->sb;

	gd_mb = ocfs2_clusters_to_megabytes(osb->sb,
		8 * ocfs2_group_bitmap_size(sb, 0, osb->s_feature_incompat));

	/*
         * This takes care of files systems with very small group
         * descriptors - 512 byte blocksize at cluster sizes lower
         * than 16K and also 1k blocksize with 4k cluster size.
         */
	if ((sb->s_blocksize == 512 && osb->s_clustersize <= 8192)
	    || (sb->s_blocksize == 1024 && osb->s_clustersize == 4096))
		return OCFS2_LA_OLD_DEFAULT;

	/*
         * Leave enough room for some block groups and make the final
         * value we work from a multiple of 4.
         */
	gd_mb -= 16;
	gd_mb &= 0xFFFFFFFB;

	la_mb = gd_mb;

	/*
         * Keep window sizes down to a reasonable default
         */
	if (la_mb > OCFS2_LA_MAX_DEFAULT_MB) {
		/*
                 * Some clustersize / blocksize combinations will have
                 * given us a larger than OCFS2_LA_MAX_DEFAULT_MB
                 * default size, but get poor distribution when
                 * limited to exactly 256 megabytes.
                 *
                 * As an example, 16K clustersize at 4K blocksize
                 * gives us a cluster group size of 504M. Paring the
                 * local alloc size down to 256 however, would give us
                 * only one window and around 200MB left in the
                 * cluster group. Instead, find the first size below
                 * 256 which would give us an even distribution.
                 *
                 * Larger cluster group sizes actually work out pretty
                 * well when pared to 256, so we don't have to do this
                 * for any group that fits more than two
                 * OCFS2_LA_MAX_DEFAULT_MB windows.
                 */
		if (gd_mb > (2 * OCFS2_LA_MAX_DEFAULT_MB))
			la_mb = 256;
		else {
			unsigned int gd_mult = gd_mb;

			while (gd_mult > 256)
				gd_mult = gd_mult >> 1;

			la_mb = gd_mult;
		}
	}

	megs_per_slot = osb->osb_clusters_at_boot / osb->max_slots;
	megs_per_slot = ocfs2_clusters_to_megabytes(osb->sb, megs_per_slot);
	/* Too many nodes, too few disk clusters. */
	if (megs_per_slot < la_mb)
		la_mb = megs_per_slot;

	/* We can't store more bits than we can in a block. */
	la_max_mb = ocfs2_clusters_to_megabytes(osb->sb,
						ocfs2_local_alloc_size(sb) * 8);
	if (la_mb > la_max_mb)
		la_mb = la_max_mb;

	return la_mb;
}


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void ocfs2_la_set_sizes(struct ocfs2_super *osb, int requested_mb)
{
	struct super_block *sb = osb->sb;
	unsigned int la_default_mb = ocfs2_la_default_mb(osb);
	unsigned int la_max_mb;

	la_max_mb = ocfs2_clusters_to_megabytes(sb,
						ocfs2_local_alloc_size(sb) * 8);

	trace_ocfs2_la_set_sizes(requested_mb, la_max_mb, la_default_mb);

	if (requested_mb == -1) {
		/* No user request - use defaults */
		osb->local_alloc_default_bits =
			ocfs2_megabytes_to_clusters(sb, la_default_mb);
	} else if (requested_mb > la_max_mb) {
		/* Request is too big, we give the maximum available */
		osb->local_alloc_default_bits =
			ocfs2_megabytes_to_clusters(sb, la_max_mb);
	} else {
		osb->local_alloc_default_bits =
			ocfs2_megabytes_to_clusters(sb, requested_mb);
	}

	osb->local_alloc_bits = osb->local_alloc_default_bits;
}


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static inline int ocfs2_la_state_enabled(struct ocfs2_super *osb)
{
	return (osb->local_alloc_state == OCFS2_LA_THROTTLED ||
		osb->local_alloc_state == OCFS2_LA_ENABLED);
}


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void ocfs2_local_alloc_seen_free_bits(struct ocfs2_super *osb,
				      unsigned int num_clusters)
{
	spin_lock(&osb->osb_lock);
	if (osb->local_alloc_state == OCFS2_LA_DISABLED ||
	    osb->local_alloc_state == OCFS2_LA_THROTTLED)
		if (num_clusters >= osb->local_alloc_default_bits) {
			cancel_delayed_work(&osb->la_enable_wq);
			osb->local_alloc_state = OCFS2_LA_ENABLED;
		}
	spin_unlock(&osb->osb_lock);
}


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void ocfs2_la_enable_worker(struct work_struct *work)
{
	struct ocfs2_super *osb =
		container_of(work, struct ocfs2_super,
			     la_enable_wq.work);
	spin_lock(&osb->osb_lock);
	osb->local_alloc_state = OCFS2_LA_ENABLED;
	spin_unlock(&osb->osb_lock);
}


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/*
 * Tell us whether a given allocation should use the local alloc
 * file. Otherwise, it has to go to the main bitmap.
 *
 * This function does semi-dirty reads of local alloc size and state!
 * This is ok however, as the values are re-checked once under mutex.
 */



int ocfs2_alloc_should_use_local(struct ocfs2_super *osb, u64 bits)
{
	int ret = 0;
	int la_bits;

	spin_lock(&osb->osb_lock);
	la_bits = osb->local_alloc_bits;

	if (!ocfs2_la_state_enabled(osb))
		goto bail;

	/* la_bits should be at least twice the size (in clusters) of
         * a new block group. We want to be sure block group
         * allocations go through the local alloc, so allow an
         * allocation to take up to half the bitmap. */
	if (bits > (la_bits / 2))
		goto bail;

	ret = 1;
bail:
	trace_ocfs2_alloc_should_use_local(
	     (unsigned long long)bits, osb->local_alloc_state, la_bits, ret);
	spin_unlock(&osb->osb_lock);
	return ret;
}


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int ocfs2_load_local_alloc(struct ocfs2_super *osb)
{
	int status = 0;
	struct ocfs2_dinode *alloc = NULL;
	struct buffer_head *alloc_bh = NULL;
	u32 num_used;
	struct inode *inode = NULL;
	struct ocfs2_local_alloc *la;

	if (osb->local_alloc_bits == 0)
		goto bail;

	if (osb->local_alloc_bits >= osb->bitmap_cpg) {
		mlog(ML_NOTICE, "Requested local alloc window %d is larger "
		     "than max possible %u. Using defaults.\n",
		     osb->local_alloc_bits, (osb->bitmap_cpg - 1));
		osb->local_alloc_bits =
			ocfs2_megabytes_to_clusters(osb->sb,
						    ocfs2_la_default_mb(osb));
	}

	/* read the alloc off disk */
	inode = ocfs2_get_system_file_inode(osb, LOCAL_ALLOC_SYSTEM_INODE,
					    osb->slot_num);
	if (!inode) {
		status = -EINVAL;
		mlog_errno(status);
		goto bail;
	}

	status = ocfs2_read_inode_block_full(inode, &alloc_bh,
					     OCFS2_BH_IGNORE_CACHE);
	if (status < 0) {
		mlog_errno(status);
		goto bail;
	}

	alloc = (struct ocfs2_dinode *) alloc_bh->b_data;
	la = OCFS2_LOCAL_ALLOC(alloc);

	if (!(le32_to_cpu(alloc->i_flags) &
	    (OCFS2_LOCAL_ALLOC_FL|OCFS2_BITMAP_FL))) {
		mlog(ML_ERROR, "Invalid local alloc inode, %llu\n",
		     (unsigned long long)OCFS2_I(inode)->ip_blkno);
		status = -EINVAL;
		goto bail;
	}

	if ((la->la_size == 0) ||
	    (le16_to_cpu(la->la_size) > ocfs2_local_alloc_size(inode->i_sb))) {
		mlog(ML_ERROR, "Local alloc size is invalid (la_size = %u)\n",
		     le16_to_cpu(la->la_size));
		status = -EINVAL;
		goto bail;
	}

	/* do a little verification. */
	num_used = ocfs2_local_alloc_count_bits(alloc);

	/* hopefully the local alloc has always been recovered before
         * we load it. */
	if (num_used
	    || alloc->id1.bitmap1.i_used
	    || alloc->id1.bitmap1.i_total
	    || la->la_bm_off)
		mlog(ML_ERROR, "Local alloc hasn't been recovered!\n"
		     "found = %u, set = %u, taken = %u, off = %u\n",
		     num_used, le32_to_cpu(alloc->id1.bitmap1.i_used),
		     le32_to_cpu(alloc->id1.bitmap1.i_total),
		     OCFS2_LOCAL_ALLOC(alloc)->la_bm_off);

	osb->local_alloc_bh = alloc_bh;
	osb->local_alloc_state = OCFS2_LA_ENABLED;

bail:
	if (status < 0)
		brelse(alloc_bh);
	iput(inode);

	trace_ocfs2_load_local_alloc(osb->local_alloc_bits);

	if (status)
		mlog_errno(status);
	return status;
}


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/*
 * return any unused bits to the bitmap and write out a clean
 * local_alloc.
 *
 * local_alloc_bh is optional. If not passed, we will simply use the
 * one off osb. If you do pass it however, be warned that it *will* be
 * returned brelse'd and NULL'd out.*/



void ocfs2_shutdown_local_alloc(struct ocfs2_super *osb)
{
	int status;
	handle_t *handle;
	struct inode *local_alloc_inode = NULL;
	struct buffer_head *bh = NULL;
	struct buffer_head *main_bm_bh = NULL;
	struct inode *main_bm_inode = NULL;
	struct ocfs2_dinode *alloc_copy = NULL;
	struct ocfs2_dinode *alloc = NULL;

	cancel_delayed_work(&osb->la_enable_wq);
	flush_workqueue(osb->ocfs2_wq);

	if (osb->local_alloc_state == OCFS2_LA_UNUSED)
		goto out;

	local_alloc_inode =
		ocfs2_get_system_file_inode(osb,
					    LOCAL_ALLOC_SYSTEM_INODE,
					    osb->slot_num);
	if (!local_alloc_inode) {
		status = -ENOENT;
		mlog_errno(status);
		goto out;
	}

	osb->local_alloc_state = OCFS2_LA_DISABLED;

	ocfs2_resmap_uninit(&osb->osb_la_resmap);

	main_bm_inode = ocfs2_get_system_file_inode(osb,
						    GLOBAL_BITMAP_SYSTEM_INODE,
						    OCFS2_INVALID_SLOT);
	if (!main_bm_inode) {
		status = -EINVAL;
		mlog_errno(status);
		goto out;
	}

	inode_lock(main_bm_inode);

	status = ocfs2_inode_lock(main_bm_inode, &main_bm_bh, 1);
	if (status < 0) {
		mlog_errno(status);
		goto out_mutex;
	}

	/* WINDOW_MOVE_CREDITS is a bit heavy... */
	handle = ocfs2_start_trans(osb, OCFS2_WINDOW_MOVE_CREDITS);
	if (IS_ERR(handle)) {
		mlog_errno(PTR_ERR(handle));
		handle = NULL;
		goto out_unlock;
	}

	bh = osb->local_alloc_bh;
	alloc = (struct ocfs2_dinode *) bh->b_data;

	alloc_copy = kmalloc(bh->b_size, GFP_NOFS);
	if (!alloc_copy) {
		status = -ENOMEM;
		goto out_commit;
	}
	memcpy(alloc_copy, alloc, bh->b_size);

	status = ocfs2_journal_access_di(handle, INODE_CACHE(local_alloc_inode),
					 bh, OCFS2_JOURNAL_ACCESS_WRITE);
	if (status < 0) {
		mlog_errno(status);
		goto out_commit;
	}

	ocfs2_clear_local_alloc(alloc);
	ocfs2_journal_dirty(handle, bh);

	brelse(bh);
	osb->local_alloc_bh = NULL;
	osb->local_alloc_state = OCFS2_LA_UNUSED;

	status = ocfs2_sync_local_to_main(osb, handle, alloc_copy,
					  main_bm_inode, main_bm_bh);
	if (status < 0)
		mlog_errno(status);

out_commit:
	ocfs2_commit_trans(osb, handle);

out_unlock:
	brelse(main_bm_bh);

	ocfs2_inode_unlock(main_bm_inode, 1);

out_mutex:
	inode_unlock(main_bm_inode);
	iput(main_bm_inode);

out:
	iput(local_alloc_inode);

	kfree(alloc_copy);
}


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/*
 * We want to free the bitmap bits outside of any recovery context as
 * we'll need a cluster lock to do so, but we must clear the local
 * alloc before giving up the recovered nodes journal. To solve this,
 * we kmalloc a copy of the local alloc before it's change for the
 * caller to process with ocfs2_complete_local_alloc_recovery
 */



int ocfs2_begin_local_alloc_recovery(struct ocfs2_super *osb,
				     int slot_num,
				     struct ocfs2_dinode **alloc_copy)
{
	int status = 0;
	struct buffer_head *alloc_bh = NULL;
	struct inode *inode = NULL;
	struct ocfs2_dinode *alloc;

	trace_ocfs2_begin_local_alloc_recovery(slot_num);

	*alloc_copy = NULL;

	inode = ocfs2_get_system_file_inode(osb,
					    LOCAL_ALLOC_SYSTEM_INODE,
					    slot_num);
	if (!inode) {
		status = -EINVAL;
		mlog_errno(status);
		goto bail;
	}

	inode_lock(inode);

	status = ocfs2_read_inode_block_full(inode, &alloc_bh,
					     OCFS2_BH_IGNORE_CACHE);
	if (status < 0) {
		mlog_errno(status);
		goto bail;
	}

	*alloc_copy = kmalloc(alloc_bh->b_size, GFP_KERNEL);
	if (!(*alloc_copy)) {
		status = -ENOMEM;
		goto bail;
	}
	memcpy((*alloc_copy), alloc_bh->b_data, alloc_bh->b_size);

	alloc = (struct ocfs2_dinode *) alloc_bh->b_data;
	ocfs2_clear_local_alloc(alloc);

	ocfs2_compute_meta_ecc(osb->sb, alloc_bh->b_data, &alloc->i_check);
	status = ocfs2_write_block(osb, alloc_bh, INODE_CACHE(inode));
	if (status < 0)
		mlog_errno(status);

bail:
	if (status < 0) {
		kfree(*alloc_copy);
		*alloc_copy = NULL;
	}

	brelse(alloc_bh);

	if (inode) {
		inode_unlock(inode);
		iput(inode);
	}

	if (status)
		mlog_errno(status);
	return status;
}


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Total274100.00%9100.00%



/*
 * Step 2: By now, we've completed the journal recovery, we've stamped
 * a clean local alloc on disk and dropped the node out of the
 * recovery map. Dlm locks will no longer stall, so lets clear out the
 * main bitmap.
 */



int ocfs2_complete_local_alloc_recovery(struct ocfs2_super *osb,
					struct ocfs2_dinode *alloc)
{
	int status;
	handle_t *handle;
	struct buffer_head *main_bm_bh = NULL;
	struct inode *main_bm_inode;

	main_bm_inode = ocfs2_get_system_file_inode(osb,
						    GLOBAL_BITMAP_SYSTEM_INODE,
						    OCFS2_INVALID_SLOT);
	if (!main_bm_inode) {
		status = -EINVAL;
		mlog_errno(status);
		goto out;
	}

	inode_lock(main_bm_inode);

	status = ocfs2_inode_lock(main_bm_inode, &main_bm_bh, 1);
	if (status < 0) {
		mlog_errno(status);
		goto out_mutex;
	}

	handle = ocfs2_start_trans(osb, OCFS2_WINDOW_MOVE_CREDITS);
	if (IS_ERR(handle)) {
		status = PTR_ERR(handle);
		handle = NULL;
		mlog_errno(status);
		goto out_unlock;
	}

	/* we want the bitmap change to be recorded on disk asap */
	handle->h_sync = 1;

	status = ocfs2_sync_local_to_main(osb, handle, alloc,
					  main_bm_inode, main_bm_bh);
	if (status < 0)
		mlog_errno(status);

	ocfs2_commit_trans(osb, handle);

out_unlock:
	ocfs2_inode_unlock(main_bm_inode, 1);

out_mutex:
	inode_unlock(main_bm_inode);

	brelse(main_bm_bh);

	iput(main_bm_inode);

out:
	if (!status)
		ocfs2_init_steal_slots(osb);
	if (status)
		mlog_errno(status);
	return status;
}


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/*
 * make sure we've got at least bits_wanted contiguous bits in the
 * local alloc. You lose them when you drop i_mutex.
 *
 * We will add ourselves to the transaction passed in, but may start
 * our own in order to shift windows.
 */



int ocfs2_reserve_local_alloc_bits(struct ocfs2_super *osb,
				   u32 bits_wanted,
				   struct ocfs2_alloc_context *ac)
{
	int status;
	struct ocfs2_dinode *alloc;
	struct inode *local_alloc_inode;
	unsigned int free_bits;

	BUG_ON(!ac);

	local_alloc_inode =
		ocfs2_get_system_file_inode(osb,
					    LOCAL_ALLOC_SYSTEM_INODE,
					    osb->slot_num);
	if (!local_alloc_inode) {
		status = -ENOENT;
		mlog_errno(status);
		goto bail;
	}

	inode_lock(local_alloc_inode);

	/*
         * We must double check state and allocator bits because
         * another process may have changed them while holding i_mutex.
         */
	spin_lock(&osb->osb_lock);
	if (!ocfs2_la_state_enabled(osb) ||
	    (bits_wanted > osb->local_alloc_bits)) {
		spin_unlock(&osb->osb_lock);
		status = -ENOSPC;
		goto bail;
	}
	spin_unlock(&osb->osb_lock);

	alloc = (struct ocfs2_dinode *) osb->local_alloc_bh->b_data;

#ifdef CONFIG_OCFS2_DEBUG_FS
	if (le32_to_cpu(alloc->id1.bitmap1.i_used) !=
	    ocfs2_local_alloc_count_bits(alloc)) {
		ocfs2_error(osb->sb, "local alloc inode %llu says it has %u used bits, but a count shows %u\n",
			    (unsigned long long)le64_to_cpu(alloc->i_blkno),
			    le32_to_cpu(alloc->id1.bitmap1.i_used),
			    ocfs2_local_alloc_count_bits(alloc));
		status = -EIO;
		goto bail;
	}
#endif

	free_bits = le32_to_cpu(alloc->id1.bitmap1.i_total) -
		le32_to_cpu(alloc->id1.bitmap1.i_used);
	if (bits_wanted > free_bits) {
		/* uhoh, window change time. */
		status =
			ocfs2_local_alloc_slide_window(osb, local_alloc_inode);
		if (status < 0) {
			if (status != -ENOSPC)
				mlog_errno(status);
			goto bail;
		}

		/*
                 * Under certain conditions, the window slide code
                 * might have reduced the number of bits available or
                 * disabled the the local alloc entirely. Re-check
                 * here and return -ENOSPC if necessary.
                 */
		status = -ENOSPC;
		if (!ocfs2_la_state_enabled(osb))
			goto bail;

		free_bits = le32_to_cpu(alloc->id1.bitmap1.i_total) -
			le32_to_cpu(alloc->id1.bitmap1.i_used);
		if (bits_wanted > free_bits)
			goto bail;
	}

	ac->ac_inode = local_alloc_inode;
	/* We should never use localalloc from another slot */
	ac->ac_alloc_slot = osb->slot_num;
	ac->ac_which = OCFS2_AC_USE_LOCAL;
	get_bh(osb->local_alloc_bh);
	ac->ac_bh = osb->local_alloc_bh;
	status = 0;
bail:
	if (status < 0 && local_alloc_inode) {
		inode_unlock(local_alloc_inode);
		iput(local_alloc_inode);
	}

	trace_ocfs2_reserve_local_alloc_bits(
		(unsigned long long)ac->ac_max_block,
		bits_wanted, osb->slot_num, status);

	if (status)
		mlog_errno(status);
	return status;
}


Contributors
PersonTokensPropCommitsCommitProp
mark fashehmark fasheh37488.63%535.71%


tao matao ma235.45%321.43%


sunil mushransunil mushran174.03%214.29%


jan karajan kara40.95%17.14%


al viroal viro20.47%17.14%


joe perchesjoe perches10.24%17.14%


joel beckerjoel becker10.24%17.14%


Total422100.00%14100.00%






int ocfs2_claim_local_alloc_bits(struct ocfs2_super *osb,
				 handle_t *handle,
				 struct ocfs2_alloc_context *ac,
				 u32 bits_wanted,
				 u32 *bit_off,
				 u32 *num_bits)
{
	int status, start;
	struct inode *local_alloc_inode;
	void *bitmap;
	struct ocfs2_dinode *alloc;
	struct ocfs2_local_alloc *la;

	BUG_ON(ac->ac_which != OCFS2_AC_USE_LOCAL);

	local_alloc_inode = ac->ac_inode;
	alloc = (struct ocfs2_dinode *) osb->local_alloc_bh->b_data;
	la = OCFS2_LOCAL_ALLOC(alloc);

	start = ocfs2_local_alloc_find_clear_bits(osb, alloc, &bits_wanted,
						  ac->ac_resv);
	if (start == -1) {
		/* TODO: Shouldn't we just BUG here? */
		status = -ENOSPC;
		mlog_errno(status);
		goto bail;
	}

	bitmap = la->la_bitmap;
	*bit_off = le32_to_cpu(la->la_bm_off) + start;
	*num_bits = bits_wanted;

	status = ocfs2_journal_access_di(handle,
					 INODE_CACHE(local_alloc_inode),
					 osb->local_alloc_bh,
					 OCFS2_JOURNAL_ACCESS_WRITE);
	if (status < 0) {
		mlog_errno(status);
		goto bail;
	}

	ocfs2_resmap_claimed_bits(&osb->osb_la_resmap, ac->ac_resv, start,
				  bits_wanted);

	while(bits_wanted--)
		ocfs2_set_bit(start++, bitmap);

	le32_add_cpu(&alloc->id1.bitmap1.i_used, *num_bits);
	ocfs2_journal_dirty(handle, osb->local_alloc_bh);

bail:
	if (status)
		mlog_errno(status);
	return status;
}


Contributors
PersonTokensPropCommitsCommitProp
mark fashehmark fasheh23994.84%450.00%


tao matao ma51.98%112.50%


joel beckerjoel becker41.59%225.00%


marcin slusarzmarcin slusarz41.59%112.50%


Total252100.00%8100.00%






int ocfs2_free_local_alloc_bits(struct ocfs2_super *osb,
				handle_t *handle,
				struct ocfs2_alloc_context *ac,
				u32 bit_off,
				u32 num_bits)
{
	int status, start;
	u32 clear_bits;
	struct inode *local_alloc_inode;
	void *bitmap;
	struct ocfs2_dinode *alloc;
	struct ocfs2_local_alloc *la;

	BUG_ON(ac->ac_which != OCFS2_AC_USE_LOCAL);

	local_alloc_inode = ac->ac_inode;
	alloc = (struct ocfs2_dinode *) osb->local_alloc_bh->b_data;
	la = OCFS2_LOCAL_ALLOC(alloc);

	bitmap = la->la_bitmap;
	start = bit_off - le32_to_cpu(la->la_bm_off);
	clear_bits = num_bits;

	status = ocfs2_journal_access_di(handle,
			INODE_CACHE(local_alloc_inode