localalloc.c 33.2 KB
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/* -*- 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"
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#include "blockcheck.h"
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#include "dlmglue.h"
#include "inode.h"
#include "journal.h"
#include "localalloc.h"
#include "suballoc.h"
#include "super.h"
#include "sysfile.h"
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#include "ocfs2_trace.h"
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#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,
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					     u32 *numbits,
					     struct ocfs2_alloc_reservation *resv);
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static void ocfs2_clear_local_alloc(struct ocfs2_dinode *alloc);

static int ocfs2_sync_local_to_main(struct ocfs2_super *osb,
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				    handle_t *handle,
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				    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,
72
					handle_t *handle,
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					struct ocfs2_alloc_context *ac);

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

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/*
 * 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;
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	unsigned int la_max_mb;
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	unsigned int megs_per_slot;
	struct super_block *sb = osb->sb;

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

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	/* 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;

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	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;
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	unsigned int la_default_mb = ocfs2_la_default_mb(osb);
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	unsigned int la_max_mb;

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

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	trace_ocfs2_la_set_sizes(requested_mb, la_max_mb, la_default_mb);
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	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);
}

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);
}

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

	spin_lock(&osb->osb_lock);
	la_bits = osb->local_alloc_bits;
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266
	if (!ocfs2_la_state_enabled(osb))
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		goto bail;
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	/* 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))
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		goto bail;
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	ret = 1;
bail:
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	trace_ocfs2_alloc_should_use_local(
	     (unsigned long long)bits, osb->local_alloc_state, la_bits, ret);
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	spin_unlock(&osb->osb_lock);
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	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;

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

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

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	/* 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;
	}

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	status = ocfs2_read_inode_block_full(inode, &alloc_bh,
					     OCFS2_BH_IGNORE_CACHE);
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	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))) {
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		mlog(ML_ERROR, "Invalid local alloc inode, %llu\n",
		     (unsigned long long)OCFS2_I(inode)->ip_blkno);
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		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)
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		brelse(alloc_bh);
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	if (inode)
		iput(inode);

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	trace_ocfs2_load_local_alloc(osb->local_alloc_bits);
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	if (status)
		mlog_errno(status);
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	return status;
}

/*
 * 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;
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	handle_t *handle;
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	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;

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

392
	if (osb->local_alloc_state == OCFS2_LA_UNUSED)
393
		goto out;
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	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);
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		goto out;
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	}

	osb->local_alloc_state = OCFS2_LA_DISABLED;

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	ocfs2_resmap_uninit(&osb->osb_la_resmap);

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	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);
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		goto out;
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	}

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	mutex_lock(&main_bm_inode->i_mutex);

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

	/* WINDOW_MOVE_CREDITS is a bit heavy... */
427
	handle = ocfs2_start_trans(osb, OCFS2_WINDOW_MOVE_CREDITS);
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	if (IS_ERR(handle)) {
		mlog_errno(PTR_ERR(handle));
		handle = NULL;
431
		goto out_unlock;
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	}

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

437
	alloc_copy = kmalloc(bh->b_size, GFP_NOFS);
438 439
	if (!alloc_copy) {
		status = -ENOMEM;
440
		goto out_commit;
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	}
	memcpy(alloc_copy, alloc, bh->b_size);

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

	ocfs2_clear_local_alloc(alloc);
452
	ocfs2_journal_dirty(handle, bh);
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	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);

463
out_commit:
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	ocfs2_commit_trans(osb, handle);
465

466
out_unlock:
467
	brelse(main_bm_bh);
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	ocfs2_inode_unlock(main_bm_inode, 1);
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out_mutex:
	mutex_unlock(&main_bm_inode->i_mutex);
	iput(main_bm_inode);

out:
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	if (local_alloc_inode)
		iput(local_alloc_inode);

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	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;

498
	trace_ocfs2_begin_local_alloc_recovery(slot_num);
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	*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;
	}

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	mutex_lock(&inode->i_mutex);
512

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	status = ocfs2_read_inode_block_full(inode, &alloc_bh,
					     OCFS2_BH_IGNORE_CACHE);
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	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);

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	ocfs2_compute_meta_ecc(osb->sb, alloc_bh->b_data, &alloc->i_check);
531
	status = ocfs2_write_block(osb, alloc_bh, INODE_CACHE(inode));
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	if (status < 0)
		mlog_errno(status);

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

541
	brelse(alloc_bh);
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	if (inode) {
544
		mutex_unlock(&inode->i_mutex);
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		iput(inode);
	}

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

/*
 * 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;
563
	handle_t *handle;
564
	struct buffer_head *main_bm_bh = NULL;
565
	struct inode *main_bm_inode;
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	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);
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		goto out;
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	}

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	mutex_lock(&main_bm_inode->i_mutex);

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

584
	handle = ocfs2_start_trans(osb, OCFS2_WINDOW_MOVE_CREDITS);
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	if (IS_ERR(handle)) {
		status = PTR_ERR(handle);
		handle = NULL;
		mlog_errno(status);
589
		goto out_unlock;
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	}

	/* we want the bitmap change to be recorded on disk asap */
593
	handle->h_sync = 1;
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	status = ocfs2_sync_local_to_main(osb, handle, alloc,
					  main_bm_inode, main_bm_bh);
	if (status < 0)
		mlog_errno(status);

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	ocfs2_commit_trans(osb, handle);
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out_unlock:
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	ocfs2_inode_unlock(main_bm_inode, 1);
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out_mutex:
	mutex_unlock(&main_bm_inode->i_mutex);
607

608
	brelse(main_bm_bh);
609

610
	iput(main_bm_inode);
611

612
out:
613
	if (!status)
614
		ocfs2_init_steal_slots(osb);
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	if (status)
		mlog_errno(status);
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	return status;
}

/*
621
 * make sure we've got at least bits_wanted contiguous bits in the
622
 * local alloc. You lose them when you drop i_mutex.
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 *
 * 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;
	}
647 648 649

	mutex_lock(&local_alloc_inode->i_mutex);

650 651 652 653 654 655 656 657
	/*
	 * 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);
658 659 660
		status = -ENOSPC;
		goto bail;
	}
661
	spin_unlock(&osb->osb_lock);
662 663 664

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

665
#ifdef CONFIG_OCFS2_DEBUG_FS
666 667
	if (le32_to_cpu(alloc->id1.bitmap1.i_used) !=
	    ocfs2_local_alloc_count_bits(alloc)) {
668
		ocfs2_error(osb->sb, "local alloc inode %llu says it has "
669
			    "%u free bits, but a count shows %u",
670
			    (unsigned long long)le64_to_cpu(alloc->i_blkno),
671 672 673 674 675
			    le32_to_cpu(alloc->id1.bitmap1.i_used),
			    ocfs2_local_alloc_count_bits(alloc));
		status = -EIO;
		goto bail;
	}
676
#endif
677 678 679 680 681 682 683 684 685 686 687 688

	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;
		}
689 690 691 692 693 694 695 696 697 698 699 700 701 702 703

		/*
		 * 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;
704 705
	}

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Mark Fasheh 已提交
706
	ac->ac_inode = local_alloc_inode;
707 708
	/* We should never use localalloc from another slot */
	ac->ac_alloc_slot = osb->slot_num;
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709
	ac->ac_which = OCFS2_AC_USE_LOCAL;
710 711 712 713
	get_bh(osb->local_alloc_bh);
	ac->ac_bh = osb->local_alloc_bh;
	status = 0;
bail:
714 715
	if (status < 0 && local_alloc_inode) {
		mutex_unlock(&local_alloc_inode->i_mutex);
M
Mark Fasheh 已提交
716
		iput(local_alloc_inode);
717
	}
718

719 720 721
	trace_ocfs2_reserve_local_alloc_bits(
		(unsigned long long)ac->ac_max_block,
		bits_wanted, osb->slot_num, status);
722

T
Tao Ma 已提交
723 724
	if (status)
		mlog_errno(status);
725 726 727 728
	return status;
}

int ocfs2_claim_local_alloc_bits(struct ocfs2_super *osb,
729
				 handle_t *handle,
730
				 struct ocfs2_alloc_context *ac,
731
				 u32 bits_wanted,
732 733 734 735 736 737 738 739 740 741 742 743 744 745 746
				 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);

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Mark Fasheh 已提交
747 748
	start = ocfs2_local_alloc_find_clear_bits(osb, alloc, &bits_wanted,
						  ac->ac_resv);
749 750 751 752 753 754 755 756 757 758 759
	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;

760 761
	status = ocfs2_journal_access_di(handle,
					 INODE_CACHE(local_alloc_inode),
762 763
					 osb->local_alloc_bh,
					 OCFS2_JOURNAL_ACCESS_WRITE);
764 765 766 767 768
	if (status < 0) {
		mlog_errno(status);
		goto bail;
	}

M
Mark Fasheh 已提交
769 770 771
	ocfs2_resmap_claimed_bits(&osb->osb_la_resmap, ac->ac_resv, start,
				  bits_wanted);

772 773 774
	while(bits_wanted--)
		ocfs2_set_bit(start++, bitmap);

775
	le32_add_cpu(&alloc->id1.bitmap1.i_used, *num_bits);
776
	ocfs2_journal_dirty(handle, osb->local_alloc_bh);
777 778

bail:
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779 780
	if (status)
		mlog_errno(status);
781 782 783 784 785
	return status;
}

static u32 ocfs2_local_alloc_count_bits(struct ocfs2_dinode *alloc)
{
A
Akinobu Mita 已提交
786
	u32 count;
787 788
	struct ocfs2_local_alloc *la = OCFS2_LOCAL_ALLOC(alloc);

A
Akinobu Mita 已提交
789
	count = memweight(la->la_bitmap, le16_to_cpu(la->la_size));
790

791
	trace_ocfs2_local_alloc_count_bits(count);
792 793 794 795
	return count;
}

static int ocfs2_local_alloc_find_clear_bits(struct ocfs2_super *osb,
M
Mark Fasheh 已提交
796 797 798
				     struct ocfs2_dinode *alloc,
				     u32 *numbits,
				     struct ocfs2_alloc_reservation *resv)
799 800
{
	int numfound, bitoff, left, startoff, lastzero;
M
Mark Fasheh 已提交
801 802
	int local_resv = 0;
	struct ocfs2_alloc_reservation r;
803
	void *bitmap = NULL;
M
Mark Fasheh 已提交
804
	struct ocfs2_reservation_map *resmap = &osb->osb_la_resmap;
805 806 807 808 809 810

	if (!alloc->id1.bitmap1.i_total) {
		bitoff = -1;
		goto bail;
	}

M
Mark Fasheh 已提交
811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834
	if (!resv) {
		local_resv = 1;
		ocfs2_resv_init_once(&r);
		ocfs2_resv_set_type(&r, OCFS2_RESV_FLAG_TMP);
		resv = &r;
	}

	numfound = *numbits;
	if (ocfs2_resmap_resv_bits(resmap, resv, &bitoff, &numfound) == 0) {
		if (numfound < *numbits)
			*numbits = numfound;
		goto bail;
	}

	/*
	 * Code error. While reservations are enabled, local
	 * allocation should _always_ go through them.
	 */
	BUG_ON(osb->osb_resv_level != 0);

	/*
	 * Reservations are disabled. Handle this the old way.
	 */

835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859
	bitmap = OCFS2_LOCAL_ALLOC(alloc)->la_bitmap;

	numfound = bitoff = startoff = 0;
	lastzero = -1;
	left = le32_to_cpu(alloc->id1.bitmap1.i_total);
	while ((bitoff = ocfs2_find_next_zero_bit(bitmap, left, startoff)) != -1) {
		if (bitoff == left) {
			/* mlog(0, "bitoff (%d) == left", bitoff); */
			break;
		}
		/* mlog(0, "Found a zero: bitoff = %d, startoff = %d, "
		   "numfound = %d\n", bitoff, startoff, numfound);*/

		/* Ok, we found a zero bit... is it contig. or do we
		 * start over?*/
		if (bitoff == startoff) {
			/* we found a zero */
			numfound++;
			startoff++;
		} else {
			/* got a zero after some ones */
			numfound = 1;
			startoff = bitoff+1;
		}
		/* we got everything we needed */
M
Mark Fasheh 已提交
860
		if (numfound == *numbits) {
861 862 863 864 865
			/* mlog(0, "Found it all!\n"); */
			break;
		}
	}

866
	trace_ocfs2_local_alloc_find_clear_bits_search_bitmap(bitoff, numfound);
867

868
	if (numfound == *numbits)
869
		bitoff = startoff - numfound;
870
	else
871 872 873
		bitoff = -1;

bail:
M
Mark Fasheh 已提交
874 875 876
	if (local_resv)
		ocfs2_resv_discard(resmap, resv);

877 878 879 880
	trace_ocfs2_local_alloc_find_clear_bits(*numbits,
		le32_to_cpu(alloc->id1.bitmap1.i_total),
		bitoff, numfound);

881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921
	return bitoff;
}

static void ocfs2_clear_local_alloc(struct ocfs2_dinode *alloc)
{
	struct ocfs2_local_alloc *la = OCFS2_LOCAL_ALLOC(alloc);
	int i;

	alloc->id1.bitmap1.i_total = 0;
	alloc->id1.bitmap1.i_used = 0;
	la->la_bm_off = 0;
	for(i = 0; i < le16_to_cpu(la->la_size); i++)
		la->la_bitmap[i] = 0;
}

#if 0
/* turn this on and uncomment below to aid debugging window shifts. */
static void ocfs2_verify_zero_bits(unsigned long *bitmap,
				   unsigned int start,
				   unsigned int count)
{
	unsigned int tmp = count;
	while(tmp--) {
		if (ocfs2_test_bit(start + tmp, bitmap)) {
			printk("ocfs2_verify_zero_bits: start = %u, count = "
			       "%u\n", start, count);
			printk("ocfs2_verify_zero_bits: bit %u is set!",
			       start + tmp);
			BUG();
		}
	}
}
#endif

/*
 * sync the local alloc to main bitmap.
 *
 * assumes you've already locked the main bitmap -- the bitmap inode
 * passed is used for caching.
 */
static int ocfs2_sync_local_to_main(struct ocfs2_super *osb,
922
				    handle_t *handle,
923 924 925 926 927 928 929 930 931 932 933
				    struct ocfs2_dinode *alloc,
				    struct inode *main_bm_inode,
				    struct buffer_head *main_bm_bh)
{
	int status = 0;
	int bit_off, left, count, start;
	u64 la_start_blk;
	u64 blkno;
	void *bitmap;
	struct ocfs2_local_alloc *la = OCFS2_LOCAL_ALLOC(alloc);

934
	trace_ocfs2_sync_local_to_main(
T
Tao Ma 已提交
935 936
	     le32_to_cpu(alloc->id1.bitmap1.i_total),
	     le32_to_cpu(alloc->id1.bitmap1.i_used));
937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964

	if (!alloc->id1.bitmap1.i_total) {
		goto bail;
	}

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

	la_start_blk = ocfs2_clusters_to_blocks(osb->sb,
						le32_to_cpu(la->la_bm_off));
	bitmap = la->la_bitmap;
	start = count = bit_off = 0;
	left = le32_to_cpu(alloc->id1.bitmap1.i_total);

	while ((bit_off = ocfs2_find_next_zero_bit(bitmap, left, start))
	       != -1) {
		if ((bit_off < left) && (bit_off == start)) {
			count++;
			start++;
			continue;
		}
		if (count) {
			blkno = la_start_blk +
				ocfs2_clusters_to_blocks(osb->sb,
							 start - count);

965
			trace_ocfs2_sync_local_to_main_free(
966 967 968
			     count, start - count,
			     (unsigned long long)la_start_blk,
			     (unsigned long long)blkno);
969

970 971 972 973
			status = ocfs2_release_clusters(handle,
							main_bm_inode,
							main_bm_bh, blkno,
							count);
974 975 976 977 978 979 980 981 982 983 984 985
			if (status < 0) {
				mlog_errno(status);
				goto bail;
			}
		}
		if (bit_off >= left)
			break;
		count = 1;
		start = bit_off + 1;
	}

bail:
T
Tao Ma 已提交
986 987
	if (status)
		mlog_errno(status);
988 989 990
	return status;
}

991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069
enum ocfs2_la_event {
	OCFS2_LA_EVENT_SLIDE,		/* Normal window slide. */
	OCFS2_LA_EVENT_FRAGMENTED,	/* The global bitmap has
					 * enough bits theoretically
					 * free, but a contiguous
					 * allocation could not be
					 * found. */
	OCFS2_LA_EVENT_ENOSPC,		/* Global bitmap doesn't have
					 * enough bits free to satisfy
					 * our request. */
};
#define OCFS2_LA_ENABLE_INTERVAL (30 * HZ)
/*
 * Given an event, calculate the size of our next local alloc window.
 *
 * This should always be called under i_mutex of the local alloc inode
 * so that local alloc disabling doesn't race with processes trying to
 * use the allocator.
 *
 * Returns the state which the local alloc was left in. This value can
 * be ignored by some paths.
 */
static int ocfs2_recalc_la_window(struct ocfs2_super *osb,
				  enum ocfs2_la_event event)
{
	unsigned int bits;
	int state;

	spin_lock(&osb->osb_lock);
	if (osb->local_alloc_state == OCFS2_LA_DISABLED) {
		WARN_ON_ONCE(osb->local_alloc_state == OCFS2_LA_DISABLED);
		goto out_unlock;
	}

	/*
	 * ENOSPC and fragmentation are treated similarly for now.
	 */
	if (event == OCFS2_LA_EVENT_ENOSPC ||
	    event == OCFS2_LA_EVENT_FRAGMENTED) {
		/*
		 * We ran out of contiguous space in the primary
		 * bitmap. Drastically reduce the number of bits used
		 * by local alloc until we have to disable it.
		 */
		bits = osb->local_alloc_bits >> 1;
		if (bits > ocfs2_megabytes_to_clusters(osb->sb, 1)) {
			/*
			 * By setting state to THROTTLED, we'll keep
			 * the number of local alloc bits used down
			 * until an event occurs which would give us
			 * reason to assume the bitmap situation might
			 * have changed.
			 */
			osb->local_alloc_state = OCFS2_LA_THROTTLED;
			osb->local_alloc_bits = bits;
		} else {
			osb->local_alloc_state = OCFS2_LA_DISABLED;
		}
		queue_delayed_work(ocfs2_wq, &osb->la_enable_wq,
				   OCFS2_LA_ENABLE_INTERVAL);
		goto out_unlock;
	}

	/*
	 * Don't increase the size of the local alloc window until we
	 * know we might be able to fulfill the request. Otherwise, we
	 * risk bouncing around the global bitmap during periods of
	 * low space.
	 */
	if (osb->local_alloc_state != OCFS2_LA_THROTTLED)
		osb->local_alloc_bits = osb->local_alloc_default_bits;

out_unlock:
	state = osb->local_alloc_state;
	spin_unlock(&osb->osb_lock);

	return state;
}

1070 1071 1072 1073 1074 1075 1076
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)
{
	int status;

1077
	*ac = kzalloc(sizeof(struct ocfs2_alloc_context), GFP_KERNEL);
1078 1079 1080 1081 1082 1083
	if (!(*ac)) {
		status = -ENOMEM;
		mlog_errno(status);
		goto bail;
	}

1084
retry_enospc:
1085
	(*ac)->ac_bits_wanted = osb->local_alloc_default_bits;
1086
	status = ocfs2_reserve_cluster_bitmap_bits(osb, *ac);
1087 1088 1089 1090 1091 1092 1093 1094 1095
	if (status == -ENOSPC) {
		if (ocfs2_recalc_la_window(osb, OCFS2_LA_EVENT_ENOSPC) ==
		    OCFS2_LA_DISABLED)
			goto bail;

		ocfs2_free_ac_resource(*ac);
		memset(*ac, 0, sizeof(struct ocfs2_alloc_context));
		goto retry_enospc;
	}
1096
	if (status < 0) {
1097
		mlog_errno(status);
1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111
		goto bail;
	}

	*bitmap_inode = (*ac)->ac_inode;
	igrab(*bitmap_inode);
	*bitmap_bh = (*ac)->ac_bh;
	get_bh(*bitmap_bh);
	status = 0;
bail:
	if ((status < 0) && *ac) {
		ocfs2_free_alloc_context(*ac);
		*ac = NULL;
	}

T
Tao Ma 已提交
1112 1113
	if (status)
		mlog_errno(status);
1114 1115 1116 1117 1118 1119 1120
	return status;
}

/*
 * pass it the bitmap lock in lock_bh if you have it.
 */
static int ocfs2_local_alloc_new_window(struct ocfs2_super *osb,
1121
					handle_t *handle,
1122 1123 1124 1125 1126 1127 1128 1129 1130 1131
					struct ocfs2_alloc_context *ac)
{
	int status = 0;
	u32 cluster_off, cluster_count;
	struct ocfs2_dinode *alloc = NULL;
	struct ocfs2_local_alloc *la;

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

1132 1133 1134
	trace_ocfs2_local_alloc_new_window(
		le32_to_cpu(alloc->id1.bitmap1.i_total),
		osb->local_alloc_bits);
M
Mark Fasheh 已提交
1135 1136 1137 1138 1139 1140

	/* Instruct the allocation code to try the most recently used
	 * cluster group. We'll re-record the group used this pass
	 * below. */
	ac->ac_last_group = osb->la_last_gd;

1141 1142 1143
	/* we used the generic suballoc reserve function, but we set
	 * everything up nicely, so there's no reason why we can't use
	 * the more specific cluster api to claim bits. */
1144
	status = ocfs2_claim_clusters(handle, ac, osb->local_alloc_bits,
1145
				      &cluster_off, &cluster_count);
1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156
	if (status == -ENOSPC) {
retry_enospc:
		/*
		 * Note: We could also try syncing the journal here to
		 * allow use of any free bits which the current
		 * transaction can't give us access to. --Mark
		 */
		if (ocfs2_recalc_la_window(osb, OCFS2_LA_EVENT_FRAGMENTED) ==
		    OCFS2_LA_DISABLED)
			goto bail;

1157
		ac->ac_bits_wanted = osb->local_alloc_default_bits;
1158
		status = ocfs2_claim_clusters(handle, ac,
1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174
					      osb->local_alloc_bits,
					      &cluster_off,
					      &cluster_count);
		if (status == -ENOSPC)
			goto retry_enospc;
		/*
		 * We only shrunk the *minimum* number of in our
		 * request - it's entirely possible that the allocator
		 * might give us more than we asked for.
		 */
		if (status == 0) {
			spin_lock(&osb->osb_lock);
			osb->local_alloc_bits = cluster_count;
			spin_unlock(&osb->osb_lock);
		}
	}
1175 1176 1177 1178 1179 1180
	if (status < 0) {
		if (status != -ENOSPC)
			mlog_errno(status);
		goto bail;
	}

M
Mark Fasheh 已提交
1181 1182
	osb->la_last_gd = ac->ac_last_group;

1183 1184 1185 1186 1187 1188 1189 1190 1191 1192
	la->la_bm_off = cpu_to_le32(cluster_off);
	alloc->id1.bitmap1.i_total = cpu_to_le32(cluster_count);
	/* just in case... In the future when we find space ourselves,
	 * we don't have to get all contiguous -- but we'll have to
	 * set all previously used bits in bitmap and update
	 * la_bits_set before setting the bits in the main bitmap. */
	alloc->id1.bitmap1.i_used = 0;
	memset(OCFS2_LOCAL_ALLOC(alloc)->la_bitmap, 0,
	       le16_to_cpu(la->la_size));

M
Mark Fasheh 已提交
1193 1194 1195
	ocfs2_resmap_restart(&osb->osb_la_resmap, cluster_count,
			     OCFS2_LOCAL_ALLOC(alloc)->la_bitmap);

1196 1197 1198
	trace_ocfs2_local_alloc_new_window_result(
		OCFS2_LOCAL_ALLOC(alloc)->la_bm_off,
		le32_to_cpu(alloc->id1.bitmap1.i_total));
1199 1200

bail:
T
Tao Ma 已提交
1201 1202
	if (status)
		mlog_errno(status);
1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213
	return status;
}

/* Note that we do *NOT* lock the local alloc inode here as
 * it's been locked already for us. */
static int ocfs2_local_alloc_slide_window(struct ocfs2_super *osb,
					  struct inode *local_alloc_inode)
{
	int status = 0;
	struct buffer_head *main_bm_bh = NULL;
	struct inode *main_bm_inode = NULL;
1214
	handle_t *handle = NULL;
1215 1216 1217 1218
	struct ocfs2_dinode *alloc;
	struct ocfs2_dinode *alloc_copy = NULL;
	struct ocfs2_alloc_context *ac = NULL;

1219 1220
	ocfs2_recalc_la_window(osb, OCFS2_LA_EVENT_SLIDE);

1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231
	/* This will lock the main bitmap for us. */
	status = ocfs2_local_alloc_reserve_for_window(osb,
						      &ac,
						      &main_bm_inode,
						      &main_bm_bh);
	if (status < 0) {
		if (status != -ENOSPC)
			mlog_errno(status);
		goto bail;
	}

1232
	handle = ocfs2_start_trans(osb, OCFS2_WINDOW_MOVE_CREDITS);
1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246
	if (IS_ERR(handle)) {
		status = PTR_ERR(handle);
		handle = NULL;
		mlog_errno(status);
		goto bail;
	}

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

	/* We want to clear the local alloc before doing anything
	 * else, so that if we error later during this operation,
	 * local alloc shutdown won't try to double free main bitmap
	 * bits. Make a copy so the sync function knows which bits to
	 * free. */
1247
	alloc_copy = kmalloc(osb->local_alloc_bh->b_size, GFP_NOFS);
1248 1249 1250 1251 1252 1253 1254
	if (!alloc_copy) {
		status = -ENOMEM;
		mlog_errno(status);
		goto bail;
	}
	memcpy(alloc_copy, alloc, osb->local_alloc_bh->b_size);

1255 1256
	status = ocfs2_journal_access_di(handle,
					 INODE_CACHE(local_alloc_inode),
1257 1258
					 osb->local_alloc_bh,
					 OCFS2_JOURNAL_ACCESS_WRITE);
1259 1260 1261 1262 1263 1264
	if (status < 0) {
		mlog_errno(status);
		goto bail;
	}

	ocfs2_clear_local_alloc(alloc);
1265
	ocfs2_journal_dirty(handle, osb->local_alloc_bh);
1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284

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

	status = ocfs2_local_alloc_new_window(osb, handle, ac);
	if (status < 0) {
		if (status != -ENOSPC)
			mlog_errno(status);
		goto bail;
	}

	atomic_inc(&osb->alloc_stats.moves);

bail:
	if (handle)
1285
		ocfs2_commit_trans(osb, handle);
1286

1287
	brelse(main_bm_bh);
1288 1289 1290 1291

	if (main_bm_inode)
		iput(main_bm_inode);

1292
	kfree(alloc_copy);
1293 1294 1295 1296

	if (ac)
		ocfs2_free_alloc_context(ac);

T
Tao Ma 已提交
1297 1298
	if (status)
		mlog_errno(status);
1299 1300 1301
	return status;
}