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/* -*- mode: c; c-basic-offset: 8; -*-
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* vim: noexpandtab sw=8 ts=8 sts=0:
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* Node local data allocation
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* Copyright (C) 2002, 2004 Oracle. All rights reserved.
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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* You should have received a copy of the GNU General Public
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* License along with this program; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 021110-1307, USA.
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#include <linux/types.h>
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#include <linux/slab.h>
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#include <linux/highmem.h>
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#include <linux/bitops.h>
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#include <cluster/masklog.h>
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#include "blockcheck.h"
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#include "localalloc.h"
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#include "ocfs2_trace.h"
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#include "buffer_head_io.h"
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#define OCFS2_LOCAL_ALLOC(dinode) (&((dinode)->id2.i_lab))
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static u32 ocfs2_local_alloc_count_bits(struct ocfs2_dinode *alloc);
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static int ocfs2_local_alloc_find_clear_bits(struct ocfs2_super *osb,
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struct ocfs2_dinode *alloc,
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struct ocfs2_alloc_reservation *resv);
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static void ocfs2_clear_local_alloc(struct ocfs2_dinode *alloc);
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static int ocfs2_sync_local_to_main(struct ocfs2_super *osb,
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struct ocfs2_dinode *alloc,
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struct inode *main_bm_inode,
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struct buffer_head *main_bm_bh);
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static int ocfs2_local_alloc_reserve_for_window(struct ocfs2_super *osb,
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struct ocfs2_alloc_context **ac,
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struct inode **bitmap_inode,
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struct buffer_head **bitmap_bh);
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static int ocfs2_local_alloc_new_window(struct ocfs2_super *osb,
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struct ocfs2_alloc_context *ac);
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static int ocfs2_local_alloc_slide_window(struct ocfs2_super *osb,
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struct inode *local_alloc_inode);
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* ocfs2_la_default_mb() - determine a default size, in megabytes of
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* Generally, we'd like to pick as large a local alloc as
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* possible. Performance on large workloads tends to scale
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* proportionally to la size. In addition to that, the reservations
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* code functions more efficiently as it can reserve more windows for
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* Some things work against us when trying to choose a large local alloc:
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* - We need to ensure our sizing is picked to leave enough space in
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* group descriptors for other allocations (such as block groups,
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* etc). Picking default sizes which are a multiple of 4 could help
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* - block groups are allocated in 2mb and 4mb chunks.
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* - Likewise, we don't want to starve other nodes of bits on small
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* file systems. This can easily be taken care of by limiting our
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* default to a reasonable size (256M) on larger cluster sizes.
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* - Some file systems can't support very large sizes - 4k and 8k in
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* particular are limited to less than 128 and 256 megabytes respectively.
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* The following reference table shows group descriptor and local
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* alloc maximums at various cluster sizes (4k blocksize)
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* csize: 4K group: 126M la: 121M
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* csize: 8K group: 252M la: 243M
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* csize: 16K group: 504M la: 486M
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* csize: 32K group: 1008M la: 972M
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* csize: 64K group: 2016M la: 1944M
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* csize: 128K group: 4032M la: 3888M
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* csize: 256K group: 8064M la: 7776M
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* csize: 512K group: 16128M la: 15552M
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* csize: 1024K group: 32256M la: 31104M
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#define OCFS2_LA_MAX_DEFAULT_MB 256
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#define OCFS2_LA_OLD_DEFAULT 8
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unsigned int ocfs2_la_default_mb(struct ocfs2_super *osb)
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unsigned int la_max_mb;
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unsigned int megs_per_slot;
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struct super_block *sb = osb->sb;
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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
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* descriptors - 512 byte blocksize at cluster sizes lower
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* than 16K and also 1k blocksize with 4k cluster size.
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if ((sb->s_blocksize == 512 && osb->s_clustersize <= 8192)
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|| (sb->s_blocksize == 1024 && osb->s_clustersize == 4096))
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return OCFS2_LA_OLD_DEFAULT;
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* Leave enough room for some block groups and make the final
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* value we work from a multiple of 4.
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* Keep window sizes down to a reasonable default
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if (la_mb > OCFS2_LA_MAX_DEFAULT_MB) {
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* Some clustersize / blocksize combinations will have
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* given us a larger than OCFS2_LA_MAX_DEFAULT_MB
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* default size, but get poor distribution when
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* limited to exactly 256 megabytes.
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* As an example, 16K clustersize at 4K blocksize
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* gives us a cluster group size of 504M. Paring the
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* local alloc size down to 256 however, would give us
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* only one window and around 200MB left in the
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* cluster group. Instead, find the first size below
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* 256 which would give us an even distribution.
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* Larger cluster group sizes actually work out pretty
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* well when pared to 256, so we don't have to do this
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* for any group that fits more than two
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* OCFS2_LA_MAX_DEFAULT_MB windows.
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if (gd_mb > (2 * OCFS2_LA_MAX_DEFAULT_MB))
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unsigned int gd_mult = gd_mb;
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while (gd_mult > 256)
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gd_mult = gd_mult >> 1;
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megs_per_slot = osb->osb_clusters_at_boot / osb->max_slots;
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megs_per_slot = ocfs2_clusters_to_megabytes(osb->sb, megs_per_slot);
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/* Too many nodes, too few disk clusters. */
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if (megs_per_slot < la_mb)
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la_mb = megs_per_slot;
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/* We can't store more bits than we can in a block. */
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la_max_mb = ocfs2_clusters_to_megabytes(osb->sb,
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ocfs2_local_alloc_size(sb) * 8);
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if (la_mb > la_max_mb)
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void ocfs2_la_set_sizes(struct ocfs2_super *osb, int requested_mb)
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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;
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la_max_mb = ocfs2_clusters_to_megabytes(sb,
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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) {
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/* No user request - use defaults */
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osb->local_alloc_default_bits =
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ocfs2_megabytes_to_clusters(sb, la_default_mb);
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} else if (requested_mb > la_max_mb) {
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/* Request is too big, we give the maximum available */
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osb->local_alloc_default_bits =
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ocfs2_megabytes_to_clusters(sb, la_max_mb);
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osb->local_alloc_default_bits =
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ocfs2_megabytes_to_clusters(sb, requested_mb);
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osb->local_alloc_bits = osb->local_alloc_default_bits;
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static inline int ocfs2_la_state_enabled(struct ocfs2_super *osb)
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return (osb->local_alloc_state == OCFS2_LA_THROTTLED ||
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osb->local_alloc_state == OCFS2_LA_ENABLED);
228
void ocfs2_local_alloc_seen_free_bits(struct ocfs2_super *osb,
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unsigned int num_clusters)
231
spin_lock(&osb->osb_lock);
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if (osb->local_alloc_state == OCFS2_LA_DISABLED ||
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osb->local_alloc_state == OCFS2_LA_THROTTLED)
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if (num_clusters >= osb->local_alloc_default_bits) {
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cancel_delayed_work(&osb->la_enable_wq);
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osb->local_alloc_state = OCFS2_LA_ENABLED;
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spin_unlock(&osb->osb_lock);
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void ocfs2_la_enable_worker(struct work_struct *work)
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struct ocfs2_super *osb =
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container_of(work, struct ocfs2_super,
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spin_lock(&osb->osb_lock);
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osb->local_alloc_state = OCFS2_LA_ENABLED;
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spin_unlock(&osb->osb_lock);
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* Tell us whether a given allocation should use the local alloc
253
* 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!
256
* This is ok however, as the values are re-checked once under mutex.
258
int ocfs2_alloc_should_use_local(struct ocfs2_super *osb, u64 bits)
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spin_lock(&osb->osb_lock);
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la_bits = osb->local_alloc_bits;
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if (!ocfs2_la_state_enabled(osb))
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/* la_bits should be at least twice the size (in clusters) of
270
* a new block group. We want to be sure block group
271
* allocations go through the local alloc, so allow an
272
* allocation to take up to half the bitmap. */
273
if (bits > (la_bits / 2))
278
trace_ocfs2_alloc_should_use_local(
279
(unsigned long long)bits, osb->local_alloc_state, la_bits, ret);
280
spin_unlock(&osb->osb_lock);
284
int ocfs2_load_local_alloc(struct ocfs2_super *osb)
287
struct ocfs2_dinode *alloc = NULL;
288
struct buffer_head *alloc_bh = NULL;
290
struct inode *inode = NULL;
291
struct ocfs2_local_alloc *la;
293
if (osb->local_alloc_bits == 0)
296
if (osb->local_alloc_bits >= osb->bitmap_cpg) {
297
mlog(ML_NOTICE, "Requested local alloc window %d is larger "
298
"than max possible %u. Using defaults.\n",
299
osb->local_alloc_bits, (osb->bitmap_cpg - 1));
300
osb->local_alloc_bits =
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ocfs2_megabytes_to_clusters(osb->sb,
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ocfs2_la_default_mb(osb));
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/* read the alloc off disk */
306
inode = ocfs2_get_system_file_inode(osb, LOCAL_ALLOC_SYSTEM_INODE,
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status = ocfs2_read_inode_block_full(inode, &alloc_bh,
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OCFS2_BH_IGNORE_CACHE);
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alloc = (struct ocfs2_dinode *) alloc_bh->b_data;
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la = OCFS2_LOCAL_ALLOC(alloc);
324
if (!(le32_to_cpu(alloc->i_flags) &
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(OCFS2_LOCAL_ALLOC_FL|OCFS2_BITMAP_FL))) {
326
mlog(ML_ERROR, "Invalid local alloc inode, %llu\n",
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(unsigned long long)OCFS2_I(inode)->ip_blkno);
332
if ((la->la_size == 0) ||
333
(le16_to_cpu(la->la_size) > ocfs2_local_alloc_size(inode->i_sb))) {
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mlog(ML_ERROR, "Local alloc size is invalid (la_size = %u)\n",
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le16_to_cpu(la->la_size));
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/* do a little verification. */
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num_used = ocfs2_local_alloc_count_bits(alloc);
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/* hopefully the local alloc has always been recovered before
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|| alloc->id1.bitmap1.i_used
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|| alloc->id1.bitmap1.i_total
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mlog(ML_ERROR, "Local alloc hasn't been recovered!\n"
350
"found = %u, set = %u, taken = %u, off = %u\n",
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num_used, le32_to_cpu(alloc->id1.bitmap1.i_used),
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le32_to_cpu(alloc->id1.bitmap1.i_total),
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OCFS2_LOCAL_ALLOC(alloc)->la_bm_off);
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osb->local_alloc_bh = alloc_bh;
356
osb->local_alloc_state = OCFS2_LA_ENABLED;
364
trace_ocfs2_load_local_alloc(osb->local_alloc_bits);
372
* return any unused bits to the bitmap and write out a clean
375
* local_alloc_bh is optional. If not passed, we will simply use the
376
* one off osb. If you do pass it however, be warned that it *will* be
377
* returned brelse'd and NULL'd out.*/
378
void ocfs2_shutdown_local_alloc(struct ocfs2_super *osb)
382
struct inode *local_alloc_inode = NULL;
383
struct buffer_head *bh = NULL;
384
struct buffer_head *main_bm_bh = NULL;
385
struct inode *main_bm_inode = NULL;
386
struct ocfs2_dinode *alloc_copy = NULL;
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struct ocfs2_dinode *alloc = NULL;
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cancel_delayed_work(&osb->la_enable_wq);
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flush_workqueue(ocfs2_wq);
392
if (osb->local_alloc_state == OCFS2_LA_UNUSED)
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ocfs2_get_system_file_inode(osb,
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LOCAL_ALLOC_SYSTEM_INODE,
399
if (!local_alloc_inode) {
405
osb->local_alloc_state = OCFS2_LA_DISABLED;
407
ocfs2_resmap_uninit(&osb->osb_la_resmap);
409
main_bm_inode = ocfs2_get_system_file_inode(osb,
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GLOBAL_BITMAP_SYSTEM_INODE,
412
if (!main_bm_inode) {
418
mutex_lock(&main_bm_inode->i_mutex);
420
status = ocfs2_inode_lock(main_bm_inode, &main_bm_bh, 1);
426
/* WINDOW_MOVE_CREDITS is a bit heavy... */
427
handle = ocfs2_start_trans(osb, OCFS2_WINDOW_MOVE_CREDITS);
428
if (IS_ERR(handle)) {
429
mlog_errno(PTR_ERR(handle));
434
bh = osb->local_alloc_bh;
435
alloc = (struct ocfs2_dinode *) bh->b_data;
437
alloc_copy = kmalloc(bh->b_size, GFP_NOFS);
442
memcpy(alloc_copy, alloc, bh->b_size);
444
status = ocfs2_journal_access_di(handle, INODE_CACHE(local_alloc_inode),
445
bh, OCFS2_JOURNAL_ACCESS_WRITE);
451
ocfs2_clear_local_alloc(alloc);
452
ocfs2_journal_dirty(handle, bh);
455
osb->local_alloc_bh = NULL;
456
osb->local_alloc_state = OCFS2_LA_UNUSED;
458
status = ocfs2_sync_local_to_main(osb, handle, alloc_copy,
459
main_bm_inode, main_bm_bh);
464
ocfs2_commit_trans(osb, handle);
469
ocfs2_inode_unlock(main_bm_inode, 1);
472
mutex_unlock(&main_bm_inode->i_mutex);
476
if (local_alloc_inode)
477
iput(local_alloc_inode);
484
* We want to free the bitmap bits outside of any recovery context as
485
* we'll need a cluster lock to do so, but we must clear the local
486
* alloc before giving up the recovered nodes journal. To solve this,
487
* we kmalloc a copy of the local alloc before it's change for the
488
* caller to process with ocfs2_complete_local_alloc_recovery
490
int ocfs2_begin_local_alloc_recovery(struct ocfs2_super *osb,
492
struct ocfs2_dinode **alloc_copy)
495
struct buffer_head *alloc_bh = NULL;
496
struct inode *inode = NULL;
497
struct ocfs2_dinode *alloc;
499
trace_ocfs2_begin_local_alloc_recovery(slot_num);
503
inode = ocfs2_get_system_file_inode(osb,
504
LOCAL_ALLOC_SYSTEM_INODE,
512
mutex_lock(&inode->i_mutex);
514
status = ocfs2_read_inode_block_full(inode, &alloc_bh,
515
OCFS2_BH_IGNORE_CACHE);
521
*alloc_copy = kmalloc(alloc_bh->b_size, GFP_KERNEL);
522
if (!(*alloc_copy)) {
526
memcpy((*alloc_copy), alloc_bh->b_data, alloc_bh->b_size);
528
alloc = (struct ocfs2_dinode *) alloc_bh->b_data;
529
ocfs2_clear_local_alloc(alloc);
531
ocfs2_compute_meta_ecc(osb->sb, alloc_bh->b_data, &alloc->i_check);
532
status = ocfs2_write_block(osb, alloc_bh, INODE_CACHE(inode));
537
if ((status < 0) && (*alloc_copy)) {
545
mutex_unlock(&inode->i_mutex);
555
* Step 2: By now, we've completed the journal recovery, we've stamped
556
* a clean local alloc on disk and dropped the node out of the
557
* recovery map. Dlm locks will no longer stall, so lets clear out the
560
int ocfs2_complete_local_alloc_recovery(struct ocfs2_super *osb,
561
struct ocfs2_dinode *alloc)
565
struct buffer_head *main_bm_bh = NULL;
566
struct inode *main_bm_inode;
568
main_bm_inode = ocfs2_get_system_file_inode(osb,
569
GLOBAL_BITMAP_SYSTEM_INODE,
571
if (!main_bm_inode) {
577
mutex_lock(&main_bm_inode->i_mutex);
579
status = ocfs2_inode_lock(main_bm_inode, &main_bm_bh, 1);
585
handle = ocfs2_start_trans(osb, OCFS2_WINDOW_MOVE_CREDITS);
586
if (IS_ERR(handle)) {
587
status = PTR_ERR(handle);
593
/* we want the bitmap change to be recorded on disk asap */
596
status = ocfs2_sync_local_to_main(osb, handle, alloc,
597
main_bm_inode, main_bm_bh);
601
ocfs2_commit_trans(osb, handle);
604
ocfs2_inode_unlock(main_bm_inode, 1);
607
mutex_unlock(&main_bm_inode->i_mutex);
615
ocfs2_init_steal_slots(osb);
622
* make sure we've got at least bits_wanted contiguous bits in the
623
* local alloc. You lose them when you drop i_mutex.
625
* We will add ourselves to the transaction passed in, but may start
626
* our own in order to shift windows.
628
int ocfs2_reserve_local_alloc_bits(struct ocfs2_super *osb,
630
struct ocfs2_alloc_context *ac)
633
struct ocfs2_dinode *alloc;
634
struct inode *local_alloc_inode;
635
unsigned int free_bits;
640
ocfs2_get_system_file_inode(osb,
641
LOCAL_ALLOC_SYSTEM_INODE,
643
if (!local_alloc_inode) {
649
mutex_lock(&local_alloc_inode->i_mutex);
652
* We must double check state and allocator bits because
653
* another process may have changed them while holding i_mutex.
655
spin_lock(&osb->osb_lock);
656
if (!ocfs2_la_state_enabled(osb) ||
657
(bits_wanted > osb->local_alloc_bits)) {
658
spin_unlock(&osb->osb_lock);
662
spin_unlock(&osb->osb_lock);
664
alloc = (struct ocfs2_dinode *) osb->local_alloc_bh->b_data;
666
#ifdef CONFIG_OCFS2_DEBUG_FS
667
if (le32_to_cpu(alloc->id1.bitmap1.i_used) !=
668
ocfs2_local_alloc_count_bits(alloc)) {
669
ocfs2_error(osb->sb, "local alloc inode %llu says it has "
670
"%u free bits, but a count shows %u",
671
(unsigned long long)le64_to_cpu(alloc->i_blkno),
672
le32_to_cpu(alloc->id1.bitmap1.i_used),
673
ocfs2_local_alloc_count_bits(alloc));
679
free_bits = le32_to_cpu(alloc->id1.bitmap1.i_total) -
680
le32_to_cpu(alloc->id1.bitmap1.i_used);
681
if (bits_wanted > free_bits) {
682
/* uhoh, window change time. */
684
ocfs2_local_alloc_slide_window(osb, local_alloc_inode);
686
if (status != -ENOSPC)
692
* Under certain conditions, the window slide code
693
* might have reduced the number of bits available or
694
* disabled the the local alloc entirely. Re-check
695
* here and return -ENOSPC if necessary.
698
if (!ocfs2_la_state_enabled(osb))
701
free_bits = le32_to_cpu(alloc->id1.bitmap1.i_total) -
702
le32_to_cpu(alloc->id1.bitmap1.i_used);
703
if (bits_wanted > free_bits)
707
ac->ac_inode = local_alloc_inode;
708
/* We should never use localalloc from another slot */
709
ac->ac_alloc_slot = osb->slot_num;
710
ac->ac_which = OCFS2_AC_USE_LOCAL;
711
get_bh(osb->local_alloc_bh);
712
ac->ac_bh = osb->local_alloc_bh;
715
if (status < 0 && local_alloc_inode) {
716
mutex_unlock(&local_alloc_inode->i_mutex);
717
iput(local_alloc_inode);
720
trace_ocfs2_reserve_local_alloc_bits(
721
(unsigned long long)ac->ac_max_block,
722
bits_wanted, osb->slot_num, status);
729
int ocfs2_claim_local_alloc_bits(struct ocfs2_super *osb,
731
struct ocfs2_alloc_context *ac,
737
struct inode *local_alloc_inode;
739
struct ocfs2_dinode *alloc;
740
struct ocfs2_local_alloc *la;
742
BUG_ON(ac->ac_which != OCFS2_AC_USE_LOCAL);
744
local_alloc_inode = ac->ac_inode;
745
alloc = (struct ocfs2_dinode *) osb->local_alloc_bh->b_data;
746
la = OCFS2_LOCAL_ALLOC(alloc);
748
start = ocfs2_local_alloc_find_clear_bits(osb, alloc, &bits_wanted,
751
/* TODO: Shouldn't we just BUG here? */
757
bitmap = la->la_bitmap;
758
*bit_off = le32_to_cpu(la->la_bm_off) + start;
759
*num_bits = bits_wanted;
761
status = ocfs2_journal_access_di(handle,
762
INODE_CACHE(local_alloc_inode),
764
OCFS2_JOURNAL_ACCESS_WRITE);
770
ocfs2_resmap_claimed_bits(&osb->osb_la_resmap, ac->ac_resv, start,
774
ocfs2_set_bit(start++, bitmap);
776
le32_add_cpu(&alloc->id1.bitmap1.i_used, *num_bits);
777
ocfs2_journal_dirty(handle, osb->local_alloc_bh);
785
static u32 ocfs2_local_alloc_count_bits(struct ocfs2_dinode *alloc)
790
struct ocfs2_local_alloc *la = OCFS2_LOCAL_ALLOC(alloc);
792
buffer = la->la_bitmap;
793
for (i = 0; i < le16_to_cpu(la->la_size); i++)
794
count += hweight8(buffer[i]);
796
trace_ocfs2_local_alloc_count_bits(count);
800
static int ocfs2_local_alloc_find_clear_bits(struct ocfs2_super *osb,
801
struct ocfs2_dinode *alloc,
803
struct ocfs2_alloc_reservation *resv)
805
int numfound, bitoff, left, startoff, lastzero;
807
struct ocfs2_alloc_reservation r;
809
struct ocfs2_reservation_map *resmap = &osb->osb_la_resmap;
811
if (!alloc->id1.bitmap1.i_total) {
818
ocfs2_resv_init_once(&r);
819
ocfs2_resv_set_type(&r, OCFS2_RESV_FLAG_TMP);
824
if (ocfs2_resmap_resv_bits(resmap, resv, &bitoff, &numfound) == 0) {
825
if (numfound < *numbits)
831
* Code error. While reservations are enabled, local
832
* allocation should _always_ go through them.
834
BUG_ON(osb->osb_resv_level != 0);
837
* Reservations are disabled. Handle this the old way.
840
bitmap = OCFS2_LOCAL_ALLOC(alloc)->la_bitmap;
842
numfound = bitoff = startoff = 0;
844
left = le32_to_cpu(alloc->id1.bitmap1.i_total);
845
while ((bitoff = ocfs2_find_next_zero_bit(bitmap, left, startoff)) != -1) {
846
if (bitoff == left) {
847
/* mlog(0, "bitoff (%d) == left", bitoff); */
850
/* mlog(0, "Found a zero: bitoff = %d, startoff = %d, "
851
"numfound = %d\n", bitoff, startoff, numfound);*/
853
/* Ok, we found a zero bit... is it contig. or do we
855
if (bitoff == startoff) {
856
/* we found a zero */
860
/* got a zero after some ones */
864
/* we got everything we needed */
865
if (numfound == *numbits) {
866
/* mlog(0, "Found it all!\n"); */
871
trace_ocfs2_local_alloc_find_clear_bits_search_bitmap(bitoff, numfound);
873
if (numfound == *numbits)
874
bitoff = startoff - numfound;
880
ocfs2_resv_discard(resmap, resv);
882
trace_ocfs2_local_alloc_find_clear_bits(*numbits,
883
le32_to_cpu(alloc->id1.bitmap1.i_total),
889
static void ocfs2_clear_local_alloc(struct ocfs2_dinode *alloc)
891
struct ocfs2_local_alloc *la = OCFS2_LOCAL_ALLOC(alloc);
894
alloc->id1.bitmap1.i_total = 0;
895
alloc->id1.bitmap1.i_used = 0;
897
for(i = 0; i < le16_to_cpu(la->la_size); i++)
898
la->la_bitmap[i] = 0;
902
/* turn this on and uncomment below to aid debugging window shifts. */
903
static void ocfs2_verify_zero_bits(unsigned long *bitmap,
907
unsigned int tmp = count;
909
if (ocfs2_test_bit(start + tmp, bitmap)) {
910
printk("ocfs2_verify_zero_bits: start = %u, count = "
911
"%u\n", start, count);
912
printk("ocfs2_verify_zero_bits: bit %u is set!",
921
* sync the local alloc to main bitmap.
923
* assumes you've already locked the main bitmap -- the bitmap inode
924
* passed is used for caching.
926
static int ocfs2_sync_local_to_main(struct ocfs2_super *osb,
928
struct ocfs2_dinode *alloc,
929
struct inode *main_bm_inode,
930
struct buffer_head *main_bm_bh)
933
int bit_off, left, count, start;
937
struct ocfs2_local_alloc *la = OCFS2_LOCAL_ALLOC(alloc);
939
trace_ocfs2_sync_local_to_main(
940
le32_to_cpu(alloc->id1.bitmap1.i_total),
941
le32_to_cpu(alloc->id1.bitmap1.i_used));
943
if (!alloc->id1.bitmap1.i_total) {
947
if (le32_to_cpu(alloc->id1.bitmap1.i_used) ==
948
le32_to_cpu(alloc->id1.bitmap1.i_total)) {
952
la_start_blk = ocfs2_clusters_to_blocks(osb->sb,
953
le32_to_cpu(la->la_bm_off));
954
bitmap = la->la_bitmap;
955
start = count = bit_off = 0;
956
left = le32_to_cpu(alloc->id1.bitmap1.i_total);
958
while ((bit_off = ocfs2_find_next_zero_bit(bitmap, left, start))
960
if ((bit_off < left) && (bit_off == start)) {
966
blkno = la_start_blk +
967
ocfs2_clusters_to_blocks(osb->sb,
970
trace_ocfs2_sync_local_to_main_free(
971
count, start - count,
972
(unsigned long long)la_start_blk,
973
(unsigned long long)blkno);
975
status = ocfs2_release_clusters(handle,
996
enum ocfs2_la_event {
997
OCFS2_LA_EVENT_SLIDE, /* Normal window slide. */
998
OCFS2_LA_EVENT_FRAGMENTED, /* The global bitmap has
999
* enough bits theoretically
1000
* free, but a contiguous
1001
* allocation could not be
1003
OCFS2_LA_EVENT_ENOSPC, /* Global bitmap doesn't have
1004
* enough bits free to satisfy
1007
#define OCFS2_LA_ENABLE_INTERVAL (30 * HZ)
1009
* Given an event, calculate the size of our next local alloc window.
1011
* This should always be called under i_mutex of the local alloc inode
1012
* so that local alloc disabling doesn't race with processes trying to
1013
* use the allocator.
1015
* Returns the state which the local alloc was left in. This value can
1016
* be ignored by some paths.
1018
static int ocfs2_recalc_la_window(struct ocfs2_super *osb,
1019
enum ocfs2_la_event event)
1024
spin_lock(&osb->osb_lock);
1025
if (osb->local_alloc_state == OCFS2_LA_DISABLED) {
1026
WARN_ON_ONCE(osb->local_alloc_state == OCFS2_LA_DISABLED);
1031
* ENOSPC and fragmentation are treated similarly for now.
1033
if (event == OCFS2_LA_EVENT_ENOSPC ||
1034
event == OCFS2_LA_EVENT_FRAGMENTED) {
1036
* We ran out of contiguous space in the primary
1037
* bitmap. Drastically reduce the number of bits used
1038
* by local alloc until we have to disable it.
1040
bits = osb->local_alloc_bits >> 1;
1041
if (bits > ocfs2_megabytes_to_clusters(osb->sb, 1)) {
1043
* By setting state to THROTTLED, we'll keep
1044
* the number of local alloc bits used down
1045
* until an event occurs which would give us
1046
* reason to assume the bitmap situation might
1049
osb->local_alloc_state = OCFS2_LA_THROTTLED;
1050
osb->local_alloc_bits = bits;
1052
osb->local_alloc_state = OCFS2_LA_DISABLED;
1054
queue_delayed_work(ocfs2_wq, &osb->la_enable_wq,
1055
OCFS2_LA_ENABLE_INTERVAL);
1060
* Don't increase the size of the local alloc window until we
1061
* know we might be able to fulfill the request. Otherwise, we
1062
* risk bouncing around the global bitmap during periods of
1065
if (osb->local_alloc_state != OCFS2_LA_THROTTLED)
1066
osb->local_alloc_bits = osb->local_alloc_default_bits;
1069
state = osb->local_alloc_state;
1070
spin_unlock(&osb->osb_lock);
1075
static int ocfs2_local_alloc_reserve_for_window(struct ocfs2_super *osb,
1076
struct ocfs2_alloc_context **ac,
1077
struct inode **bitmap_inode,
1078
struct buffer_head **bitmap_bh)
1082
*ac = kzalloc(sizeof(struct ocfs2_alloc_context), GFP_KERNEL);
1090
(*ac)->ac_bits_wanted = osb->local_alloc_default_bits;
1091
status = ocfs2_reserve_cluster_bitmap_bits(osb, *ac);
1092
if (status == -ENOSPC) {
1093
if (ocfs2_recalc_la_window(osb, OCFS2_LA_EVENT_ENOSPC) ==
1097
ocfs2_free_ac_resource(*ac);
1098
memset(*ac, 0, sizeof(struct ocfs2_alloc_context));
1106
*bitmap_inode = (*ac)->ac_inode;
1107
igrab(*bitmap_inode);
1108
*bitmap_bh = (*ac)->ac_bh;
1112
if ((status < 0) && *ac) {
1113
ocfs2_free_alloc_context(*ac);
1123
* pass it the bitmap lock in lock_bh if you have it.
1125
static int ocfs2_local_alloc_new_window(struct ocfs2_super *osb,
1127
struct ocfs2_alloc_context *ac)
1130
u32 cluster_off, cluster_count;
1131
struct ocfs2_dinode *alloc = NULL;
1132
struct ocfs2_local_alloc *la;
1134
alloc = (struct ocfs2_dinode *) osb->local_alloc_bh->b_data;
1135
la = OCFS2_LOCAL_ALLOC(alloc);
1137
trace_ocfs2_local_alloc_new_window(
1138
le32_to_cpu(alloc->id1.bitmap1.i_total),
1139
osb->local_alloc_bits);
1141
/* Instruct the allocation code to try the most recently used
1142
* cluster group. We'll re-record the group used this pass
1144
ac->ac_last_group = osb->la_last_gd;
1146
/* we used the generic suballoc reserve function, but we set
1147
* everything up nicely, so there's no reason why we can't use
1148
* the more specific cluster api to claim bits. */
1149
status = ocfs2_claim_clusters(handle, ac, osb->local_alloc_bits,
1150
&cluster_off, &cluster_count);
1151
if (status == -ENOSPC) {
1154
* Note: We could also try syncing the journal here to
1155
* allow use of any free bits which the current
1156
* transaction can't give us access to. --Mark
1158
if (ocfs2_recalc_la_window(osb, OCFS2_LA_EVENT_FRAGMENTED) ==
1162
ac->ac_bits_wanted = osb->local_alloc_default_bits;
1163
status = ocfs2_claim_clusters(handle, ac,
1164
osb->local_alloc_bits,
1167
if (status == -ENOSPC)
1170
* We only shrunk the *minimum* number of in our
1171
* request - it's entirely possible that the allocator
1172
* might give us more than we asked for.
1175
spin_lock(&osb->osb_lock);
1176
osb->local_alloc_bits = cluster_count;
1177
spin_unlock(&osb->osb_lock);
1181
if (status != -ENOSPC)
1186
osb->la_last_gd = ac->ac_last_group;
1188
la->la_bm_off = cpu_to_le32(cluster_off);
1189
alloc->id1.bitmap1.i_total = cpu_to_le32(cluster_count);
1190
/* just in case... In the future when we find space ourselves,
1191
* we don't have to get all contiguous -- but we'll have to
1192
* set all previously used bits in bitmap and update
1193
* la_bits_set before setting the bits in the main bitmap. */
1194
alloc->id1.bitmap1.i_used = 0;
1195
memset(OCFS2_LOCAL_ALLOC(alloc)->la_bitmap, 0,
1196
le16_to_cpu(la->la_size));
1198
ocfs2_resmap_restart(&osb->osb_la_resmap, cluster_count,
1199
OCFS2_LOCAL_ALLOC(alloc)->la_bitmap);
1201
trace_ocfs2_local_alloc_new_window_result(
1202
OCFS2_LOCAL_ALLOC(alloc)->la_bm_off,
1203
le32_to_cpu(alloc->id1.bitmap1.i_total));
1211
/* Note that we do *NOT* lock the local alloc inode here as
1212
* it's been locked already for us. */
1213
static int ocfs2_local_alloc_slide_window(struct ocfs2_super *osb,
1214
struct inode *local_alloc_inode)
1217
struct buffer_head *main_bm_bh = NULL;
1218
struct inode *main_bm_inode = NULL;
1219
handle_t *handle = NULL;
1220
struct ocfs2_dinode *alloc;
1221
struct ocfs2_dinode *alloc_copy = NULL;
1222
struct ocfs2_alloc_context *ac = NULL;
1224
ocfs2_recalc_la_window(osb, OCFS2_LA_EVENT_SLIDE);
1226
/* This will lock the main bitmap for us. */
1227
status = ocfs2_local_alloc_reserve_for_window(osb,
1232
if (status != -ENOSPC)
1237
handle = ocfs2_start_trans(osb, OCFS2_WINDOW_MOVE_CREDITS);
1238
if (IS_ERR(handle)) {
1239
status = PTR_ERR(handle);
1245
alloc = (struct ocfs2_dinode *) osb->local_alloc_bh->b_data;
1247
/* We want to clear the local alloc before doing anything
1248
* else, so that if we error later during this operation,
1249
* local alloc shutdown won't try to double free main bitmap
1250
* bits. Make a copy so the sync function knows which bits to
1252
alloc_copy = kmalloc(osb->local_alloc_bh->b_size, GFP_NOFS);
1258
memcpy(alloc_copy, alloc, osb->local_alloc_bh->b_size);
1260
status = ocfs2_journal_access_di(handle,
1261
INODE_CACHE(local_alloc_inode),
1262
osb->local_alloc_bh,
1263
OCFS2_JOURNAL_ACCESS_WRITE);
1269
ocfs2_clear_local_alloc(alloc);
1270
ocfs2_journal_dirty(handle, osb->local_alloc_bh);
1272
status = ocfs2_sync_local_to_main(osb, handle, alloc_copy,
1273
main_bm_inode, main_bm_bh);
1279
status = ocfs2_local_alloc_new_window(osb, handle, ac);
1281
if (status != -ENOSPC)
1286
atomic_inc(&osb->alloc_stats.moves);
1290
ocfs2_commit_trans(osb, handle);
1295
iput(main_bm_inode);
1301
ocfs2_free_alloc_context(ac);