linux/fs/ocfs2/localalloc.c
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   1/* -*- mode: c; c-basic-offset: 8; -*-
   2 * vim: noexpandtab sw=8 ts=8 sts=0:
   3 *
   4 * localalloc.c
   5 *
   6 * Node local data allocation
   7 *
   8 * Copyright (C) 2002, 2004 Oracle.  All rights reserved.
   9 *
  10 * This program is free software; you can redistribute it and/or
  11 * modify it under the terms of the GNU General Public
  12 * License as published by the Free Software Foundation; either
  13 * version 2 of the License, or (at your option) any later version.
  14 *
  15 * This program is distributed in the hope that it will be useful,
  16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18 * General Public License for more details.
  19 *
  20 * You should have received a copy of the GNU General Public
  21 * License along with this program; if not, write to the
  22 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  23 * Boston, MA 021110-1307, USA.
  24 */
  25
  26#include <linux/fs.h>
  27#include <linux/types.h>
  28#include <linux/slab.h>
  29#include <linux/highmem.h>
  30#include <linux/bitops.h>
  31
  32#include <cluster/masklog.h>
  33
  34#include "ocfs2.h"
  35
  36#include "alloc.h"
  37#include "blockcheck.h"
  38#include "dlmglue.h"
  39#include "inode.h"
  40#include "journal.h"
  41#include "localalloc.h"
  42#include "suballoc.h"
  43#include "super.h"
  44#include "sysfile.h"
  45#include "ocfs2_trace.h"
  46
  47#include "buffer_head_io.h"
  48
  49#define OCFS2_LOCAL_ALLOC(dinode)       (&((dinode)->id2.i_lab))
  50
  51static u32 ocfs2_local_alloc_count_bits(struct ocfs2_dinode *alloc);
  52
  53static int ocfs2_local_alloc_find_clear_bits(struct ocfs2_super *osb,
  54                                             struct ocfs2_dinode *alloc,
  55                                             u32 *numbits,
  56                                             struct ocfs2_alloc_reservation *resv);
  57
  58static void ocfs2_clear_local_alloc(struct ocfs2_dinode *alloc);
  59
  60static int ocfs2_sync_local_to_main(struct ocfs2_super *osb,
  61                                    handle_t *handle,
  62                                    struct ocfs2_dinode *alloc,
  63                                    struct inode *main_bm_inode,
  64                                    struct buffer_head *main_bm_bh);
  65
  66static int ocfs2_local_alloc_reserve_for_window(struct ocfs2_super *osb,
  67                                                struct ocfs2_alloc_context **ac,
  68                                                struct inode **bitmap_inode,
  69                                                struct buffer_head **bitmap_bh);
  70
  71static int ocfs2_local_alloc_new_window(struct ocfs2_super *osb,
  72                                        handle_t *handle,
  73                                        struct ocfs2_alloc_context *ac);
  74
  75static int ocfs2_local_alloc_slide_window(struct ocfs2_super *osb,
  76                                          struct inode *local_alloc_inode);
  77
  78/*
  79 * ocfs2_la_default_mb() - determine a default size, in megabytes of
  80 * the local alloc.
  81 *
  82 * Generally, we'd like to pick as large a local alloc as
  83 * possible. Performance on large workloads tends to scale
  84 * proportionally to la size. In addition to that, the reservations
  85 * code functions more efficiently as it can reserve more windows for
  86 * write.
  87 *
  88 * Some things work against us when trying to choose a large local alloc:
  89 *
  90 * - We need to ensure our sizing is picked to leave enough space in
  91 *   group descriptors for other allocations (such as block groups,
  92 *   etc). Picking default sizes which are a multiple of 4 could help
  93 *   - block groups are allocated in 2mb and 4mb chunks.
  94 *
  95 * - Likewise, we don't want to starve other nodes of bits on small
  96 *   file systems. This can easily be taken care of by limiting our
  97 *   default to a reasonable size (256M) on larger cluster sizes.
  98 *
  99 * - Some file systems can't support very large sizes - 4k and 8k in
 100 *   particular are limited to less than 128 and 256 megabytes respectively.
 101 *
 102 * The following reference table shows group descriptor and local
 103 * alloc maximums at various cluster sizes (4k blocksize)
 104 *
 105 * csize: 4K    group: 126M     la: 121M
 106 * csize: 8K    group: 252M     la: 243M
 107 * csize: 16K   group: 504M     la: 486M
 108 * csize: 32K   group: 1008M    la: 972M
 109 * csize: 64K   group: 2016M    la: 1944M
 110 * csize: 128K  group: 4032M    la: 3888M
 111 * csize: 256K  group: 8064M    la: 7776M
 112 * csize: 512K  group: 16128M   la: 15552M
 113 * csize: 1024K group: 32256M   la: 31104M
 114 */
 115#define OCFS2_LA_MAX_DEFAULT_MB 256
 116#define OCFS2_LA_OLD_DEFAULT    8
 117unsigned int ocfs2_la_default_mb(struct ocfs2_super *osb)
 118{
 119        unsigned int la_mb;
 120        unsigned int gd_mb;
 121        unsigned int la_max_mb;
 122        unsigned int megs_per_slot;
 123        struct super_block *sb = osb->sb;
 124
 125        gd_mb = ocfs2_clusters_to_megabytes(osb->sb,
 126                8 * ocfs2_group_bitmap_size(sb, 0, osb->s_feature_incompat));
 127
 128        /*
 129         * This takes care of files systems with very small group
 130         * descriptors - 512 byte blocksize at cluster sizes lower
 131         * than 16K and also 1k blocksize with 4k cluster size.
 132         */
 133        if ((sb->s_blocksize == 512 && osb->s_clustersize <= 8192)
 134            || (sb->s_blocksize == 1024 && osb->s_clustersize == 4096))
 135                return OCFS2_LA_OLD_DEFAULT;
 136
 137        /*
 138         * Leave enough room for some block groups and make the final
 139         * value we work from a multiple of 4.
 140         */
 141        gd_mb -= 16;
 142        gd_mb &= 0xFFFFFFFB;
 143
 144        la_mb = gd_mb;
 145
 146        /*
 147         * Keep window sizes down to a reasonable default
 148         */
 149        if (la_mb > OCFS2_LA_MAX_DEFAULT_MB) {
 150                /*
 151                 * Some clustersize / blocksize combinations will have
 152                 * given us a larger than OCFS2_LA_MAX_DEFAULT_MB
 153                 * default size, but get poor distribution when
 154                 * limited to exactly 256 megabytes.
 155                 *
 156                 * As an example, 16K clustersize at 4K blocksize
 157                 * gives us a cluster group size of 504M. Paring the
 158                 * local alloc size down to 256 however, would give us
 159                 * only one window and around 200MB left in the
 160                 * cluster group. Instead, find the first size below
 161                 * 256 which would give us an even distribution.
 162                 *
 163                 * Larger cluster group sizes actually work out pretty
 164                 * well when pared to 256, so we don't have to do this
 165                 * for any group that fits more than two
 166                 * OCFS2_LA_MAX_DEFAULT_MB windows.
 167                 */
 168                if (gd_mb > (2 * OCFS2_LA_MAX_DEFAULT_MB))
 169                        la_mb = 256;
 170                else {
 171                        unsigned int gd_mult = gd_mb;
 172
 173                        while (gd_mult > 256)
 174                                gd_mult = gd_mult >> 1;
 175
 176                        la_mb = gd_mult;
 177                }
 178        }
 179
 180        megs_per_slot = osb->osb_clusters_at_boot / osb->max_slots;
 181        megs_per_slot = ocfs2_clusters_to_megabytes(osb->sb, megs_per_slot);
 182        /* Too many nodes, too few disk clusters. */
 183        if (megs_per_slot < la_mb)
 184                la_mb = megs_per_slot;
 185
 186        /* We can't store more bits than we can in a block. */
 187        la_max_mb = ocfs2_clusters_to_megabytes(osb->sb,
 188                                                ocfs2_local_alloc_size(sb) * 8);
 189        if (la_mb > la_max_mb)
 190                la_mb = la_max_mb;
 191
 192        return la_mb;
 193}
 194
 195void ocfs2_la_set_sizes(struct ocfs2_super *osb, int requested_mb)
 196{
 197        struct super_block *sb = osb->sb;
 198        unsigned int la_default_mb = ocfs2_la_default_mb(osb);
 199        unsigned int la_max_mb;
 200
 201        la_max_mb = ocfs2_clusters_to_megabytes(sb,
 202                                                ocfs2_local_alloc_size(sb) * 8);
 203
 204        trace_ocfs2_la_set_sizes(requested_mb, la_max_mb, la_default_mb);
 205
 206        if (requested_mb == -1) {
 207                /* No user request - use defaults */
 208                osb->local_alloc_default_bits =
 209                        ocfs2_megabytes_to_clusters(sb, la_default_mb);
 210        } else if (requested_mb > la_max_mb) {
 211                /* Request is too big, we give the maximum available */
 212                osb->local_alloc_default_bits =
 213                        ocfs2_megabytes_to_clusters(sb, la_max_mb);
 214        } else {
 215                osb->local_alloc_default_bits =
 216                        ocfs2_megabytes_to_clusters(sb, requested_mb);
 217        }
 218
 219        osb->local_alloc_bits = osb->local_alloc_default_bits;
 220}
 221
 222static inline int ocfs2_la_state_enabled(struct ocfs2_super *osb)
 223{
 224        return (osb->local_alloc_state == OCFS2_LA_THROTTLED ||
 225                osb->local_alloc_state == OCFS2_LA_ENABLED);
 226}
 227
 228void ocfs2_local_alloc_seen_free_bits(struct ocfs2_super *osb,
 229                                      unsigned int num_clusters)
 230{
 231        spin_lock(&osb->osb_lock);
 232        if (osb->local_alloc_state == OCFS2_LA_DISABLED ||
 233            osb->local_alloc_state == OCFS2_LA_THROTTLED)
 234                if (num_clusters >= osb->local_alloc_default_bits) {
 235                        cancel_delayed_work(&osb->la_enable_wq);
 236                        osb->local_alloc_state = OCFS2_LA_ENABLED;
 237                }
 238        spin_unlock(&osb->osb_lock);
 239}
 240
 241void ocfs2_la_enable_worker(struct work_struct *work)
 242{
 243        struct ocfs2_super *osb =
 244                container_of(work, struct ocfs2_super,
 245                             la_enable_wq.work);
 246        spin_lock(&osb->osb_lock);
 247        osb->local_alloc_state = OCFS2_LA_ENABLED;
 248        spin_unlock(&osb->osb_lock);
 249}
 250
 251/*
 252 * Tell us whether a given allocation should use the local alloc
 253 * file. Otherwise, it has to go to the main bitmap.
 254 *
 255 * 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.
 257 */
 258int ocfs2_alloc_should_use_local(struct ocfs2_super *osb, u64 bits)
 259{
 260        int ret = 0;
 261        int la_bits;
 262
 263        spin_lock(&osb->osb_lock);
 264        la_bits = osb->local_alloc_bits;
 265
 266        if (!ocfs2_la_state_enabled(osb))
 267                goto bail;
 268
 269        /* 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))
 274                goto bail;
 275
 276        ret = 1;
 277bail:
 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);
 281        return ret;
 282}
 283
 284int ocfs2_load_local_alloc(struct ocfs2_super *osb)
 285{
 286        int status = 0;
 287        struct ocfs2_dinode *alloc = NULL;
 288        struct buffer_head *alloc_bh = NULL;
 289        u32 num_used;
 290        struct inode *inode = NULL;
 291        struct ocfs2_local_alloc *la;
 292
 293        if (osb->local_alloc_bits == 0)
 294                goto bail;
 295
 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 =
 301                        ocfs2_megabytes_to_clusters(osb->sb,
 302                                                    ocfs2_la_default_mb(osb));
 303        }
 304
 305        /* read the alloc off disk */
 306        inode = ocfs2_get_system_file_inode(osb, LOCAL_ALLOC_SYSTEM_INODE,
 307                                            osb->slot_num);
 308        if (!inode) {
 309                status = -EINVAL;
 310                mlog_errno(status);
 311                goto bail;
 312        }
 313
 314        status = ocfs2_read_inode_block_full(inode, &alloc_bh,
 315                                             OCFS2_BH_IGNORE_CACHE);
 316        if (status < 0) {
 317                mlog_errno(status);
 318                goto bail;
 319        }
 320
 321        alloc = (struct ocfs2_dinode *) alloc_bh->b_data;
 322        la = OCFS2_LOCAL_ALLOC(alloc);
 323
 324        if (!(le32_to_cpu(alloc->i_flags) &
 325            (OCFS2_LOCAL_ALLOC_FL|OCFS2_BITMAP_FL))) {
 326                mlog(ML_ERROR, "Invalid local alloc inode, %llu\n",
 327                     (unsigned long long)OCFS2_I(inode)->ip_blkno);
 328                status = -EINVAL;
 329                goto bail;
 330        }
 331
 332        if ((la->la_size == 0) ||
 333            (le16_to_cpu(la->la_size) > ocfs2_local_alloc_size(inode->i_sb))) {
 334                mlog(ML_ERROR, "Local alloc size is invalid (la_size = %u)\n",
 335                     le16_to_cpu(la->la_size));
 336                status = -EINVAL;
 337                goto bail;
 338        }
 339
 340        /* do a little verification. */
 341        num_used = ocfs2_local_alloc_count_bits(alloc);
 342
 343        /* hopefully the local alloc has always been recovered before
 344         * we load it. */
 345        if (num_used
 346            || alloc->id1.bitmap1.i_used
 347            || alloc->id1.bitmap1.i_total
 348            || la->la_bm_off)
 349                mlog(ML_ERROR, "Local alloc hasn't been recovered!\n"
 350                     "found = %u, set = %u, taken = %u, off = %u\n",
 351                     num_used, le32_to_cpu(alloc->id1.bitmap1.i_used),
 352                     le32_to_cpu(alloc->id1.bitmap1.i_total),
 353                     OCFS2_LOCAL_ALLOC(alloc)->la_bm_off);
 354
 355        osb->local_alloc_bh = alloc_bh;
 356        osb->local_alloc_state = OCFS2_LA_ENABLED;
 357
 358bail:
 359        if (status < 0)
 360                brelse(alloc_bh);
 361        if (inode)
 362                iput(inode);
 363
 364        trace_ocfs2_load_local_alloc(osb->local_alloc_bits);
 365
 366        if (status)
 367                mlog_errno(status);
 368        return status;
 369}
 370
 371/*
 372 * return any unused bits to the bitmap and write out a clean
 373 * local_alloc.
 374 *
 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.*/
 378void ocfs2_shutdown_local_alloc(struct ocfs2_super *osb)
 379{
 380        int status;
 381        handle_t *handle;
 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;
 387        struct ocfs2_dinode *alloc = NULL;
 388
 389        cancel_delayed_work(&osb->la_enable_wq);
 390        flush_workqueue(ocfs2_wq);
 391
 392        if (osb->local_alloc_state == OCFS2_LA_UNUSED)
 393                goto out;
 394
 395        local_alloc_inode =
 396                ocfs2_get_system_file_inode(osb,
 397                                            LOCAL_ALLOC_SYSTEM_INODE,
 398                                            osb->slot_num);
 399        if (!local_alloc_inode) {
 400                status = -ENOENT;
 401                mlog_errno(status);
 402                goto out;
 403        }
 404
 405        osb->local_alloc_state = OCFS2_LA_DISABLED;
 406
 407        ocfs2_resmap_uninit(&osb->osb_la_resmap);
 408
 409        main_bm_inode = ocfs2_get_system_file_inode(osb,
 410                                                    GLOBAL_BITMAP_SYSTEM_INODE,
 411                                                    OCFS2_INVALID_SLOT);
 412        if (!main_bm_inode) {
 413                status = -EINVAL;
 414                mlog_errno(status);
 415                goto out;
 416        }
 417
 418        mutex_lock(&main_bm_inode->i_mutex);
 419
 420        status = ocfs2_inode_lock(main_bm_inode, &main_bm_bh, 1);
 421        if (status < 0) {
 422                mlog_errno(status);
 423                goto out_mutex;
 424        }
 425
 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));
 430                handle = NULL;
 431                goto out_unlock;
 432        }
 433
 434        bh = osb->local_alloc_bh;
 435        alloc = (struct ocfs2_dinode *) bh->b_data;
 436
 437        alloc_copy = kmalloc(bh->b_size, GFP_NOFS);
 438        if (!alloc_copy) {
 439                status = -ENOMEM;
 440                goto out_commit;
 441        }
 442        memcpy(alloc_copy, alloc, bh->b_size);
 443
 444        status = ocfs2_journal_access_di(handle, INODE_CACHE(local_alloc_inode),
 445                                         bh, OCFS2_JOURNAL_ACCESS_WRITE);
 446        if (status < 0) {
 447                mlog_errno(status);
 448                goto out_commit;
 449        }
 450
 451        ocfs2_clear_local_alloc(alloc);
 452        ocfs2_journal_dirty(handle, bh);
 453
 454        brelse(bh);
 455        osb->local_alloc_bh = NULL;
 456        osb->local_alloc_state = OCFS2_LA_UNUSED;
 457
 458        status = ocfs2_sync_local_to_main(osb, handle, alloc_copy,
 459                                          main_bm_inode, main_bm_bh);
 460        if (status < 0)
 461                mlog_errno(status);
 462
 463out_commit:
 464        ocfs2_commit_trans(osb, handle);
 465
 466out_unlock:
 467        brelse(main_bm_bh);
 468
 469        ocfs2_inode_unlock(main_bm_inode, 1);
 470
 471out_mutex:
 472        mutex_unlock(&main_bm_inode->i_mutex);
 473        iput(main_bm_inode);
 474
 475out:
 476        if (local_alloc_inode)
 477                iput(local_alloc_inode);
 478
 479        kfree(alloc_copy);
 480}
 481
 482/*
 483 * We want to free the bitmap bits outside of any recovery context as
 484 * we'll need a cluster lock to do so, but we must clear the local
 485 * alloc before giving up the recovered nodes journal. To solve this,
 486 * we kmalloc a copy of the local alloc before it's change for the
 487 * caller to process with ocfs2_complete_local_alloc_recovery
 488 */
 489int ocfs2_begin_local_alloc_recovery(struct ocfs2_super *osb,
 490                                     int slot_num,
 491                                     struct ocfs2_dinode **alloc_copy)
 492{
 493        int status = 0;
 494        struct buffer_head *alloc_bh = NULL;
 495        struct inode *inode = NULL;
 496        struct ocfs2_dinode *alloc;
 497
 498        trace_ocfs2_begin_local_alloc_recovery(slot_num);
 499
 500        *alloc_copy = NULL;
 501
 502        inode = ocfs2_get_system_file_inode(osb,
 503                                            LOCAL_ALLOC_SYSTEM_INODE,
 504                                            slot_num);
 505        if (!inode) {
 506                status = -EINVAL;
 507                mlog_errno(status);
 508                goto bail;
 509        }
 510
 511        mutex_lock(&inode->i_mutex);
 512
 513        status = ocfs2_read_inode_block_full(inode, &alloc_bh,
 514                                             OCFS2_BH_IGNORE_CACHE);
 515        if (status < 0) {
 516                mlog_errno(status);
 517                goto bail;
 518        }
 519
 520        *alloc_copy = kmalloc(alloc_bh->b_size, GFP_KERNEL);
 521        if (!(*alloc_copy)) {
 522                status = -ENOMEM;
 523                goto bail;
 524        }
 525        memcpy((*alloc_copy), alloc_bh->b_data, alloc_bh->b_size);
 526
 527        alloc = (struct ocfs2_dinode *) alloc_bh->b_data;
 528        ocfs2_clear_local_alloc(alloc);
 529
 530        ocfs2_compute_meta_ecc(osb->sb, alloc_bh->b_data, &alloc->i_check);
 531        status = ocfs2_write_block(osb, alloc_bh, INODE_CACHE(inode));
 532        if (status < 0)
 533                mlog_errno(status);
 534
 535bail:
 536        if (status < 0) {
 537                kfree(*alloc_copy);
 538                *alloc_copy = NULL;
 539        }
 540
 541        brelse(alloc_bh);
 542
 543        if (inode) {
 544                mutex_unlock(&inode->i_mutex);
 545                iput(inode);
 546        }
 547
 548        if (status)
 549                mlog_errno(status);
 550        return status;
 551}
 552
 553/*
 554 * Step 2: By now, we've completed the journal recovery, we've stamped
 555 * a clean local alloc on disk and dropped the node out of the
 556 * recovery map. Dlm locks will no longer stall, so lets clear out the
 557 * main bitmap.
 558 */
 559int ocfs2_complete_local_alloc_recovery(struct ocfs2_super *osb,
 560                                        struct ocfs2_dinode *alloc)
 561{
 562        int status;
 563        handle_t *handle;
 564        struct buffer_head *main_bm_bh = NULL;
 565        struct inode *main_bm_inode;
 566
 567        main_bm_inode = ocfs2_get_system_file_inode(osb,
 568                                                    GLOBAL_BITMAP_SYSTEM_INODE,
 569                                                    OCFS2_INVALID_SLOT);
 570        if (!main_bm_inode) {
 571                status = -EINVAL;
 572                mlog_errno(status);
 573                goto out;
 574        }
 575
 576        mutex_lock(&main_bm_inode->i_mutex);
 577
 578        status = ocfs2_inode_lock(main_bm_inode, &main_bm_bh, 1);
 579        if (status < 0) {
 580                mlog_errno(status);
 581                goto out_mutex;
 582        }
 583
 584        handle = ocfs2_start_trans(osb, OCFS2_WINDOW_MOVE_CREDITS);
 585        if (IS_ERR(handle)) {
 586                status = PTR_ERR(handle);
 587                handle = NULL;
 588                mlog_errno(status);
 589                goto out_unlock;
 590        }
 591
 592        /* we want the bitmap change to be recorded on disk asap */
 593        handle->h_sync = 1;
 594
 595        status = ocfs2_sync_local_to_main(osb, handle, alloc,
 596                                          main_bm_inode, main_bm_bh);
 597        if (status < 0)
 598                mlog_errno(status);
 599
 600        ocfs2_commit_trans(osb, handle);
 601
 602out_unlock:
 603        ocfs2_inode_unlock(main_bm_inode, 1);
 604
 605out_mutex:
 606        mutex_unlock(&main_bm_inode->i_mutex);
 607
 608        brelse(main_bm_bh);
 609
 610        iput(main_bm_inode);
 611
 612out:
 613        if (!status)
 614                ocfs2_init_steal_slots(osb);
 615        if (status)
 616                mlog_errno(status);
 617        return status;
 618}
 619
 620/*
 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.
 623 *
 624 * We will add ourselves to the transaction passed in, but may start
 625 * our own in order to shift windows.
 626 */
 627int ocfs2_reserve_local_alloc_bits(struct ocfs2_super *osb,
 628                                   u32 bits_wanted,
 629                                   struct ocfs2_alloc_context *ac)
 630{
 631        int status;
 632        struct ocfs2_dinode *alloc;
 633        struct inode *local_alloc_inode;
 634        unsigned int free_bits;
 635
 636        BUG_ON(!ac);
 637
 638        local_alloc_inode =
 639                ocfs2_get_system_file_inode(osb,
 640                                            LOCAL_ALLOC_SYSTEM_INODE,
 641                                            osb->slot_num);
 642        if (!local_alloc_inode) {
 643                status = -ENOENT;
 644                mlog_errno(status);
 645                goto bail;
 646        }
 647
 648        mutex_lock(&local_alloc_inode->i_mutex);
 649
 650        /*
 651         * We must double check state and allocator bits because
 652         * another process may have changed them while holding i_mutex.
 653         */
 654        spin_lock(&osb->osb_lock);
 655        if (!ocfs2_la_state_enabled(osb) ||
 656            (bits_wanted > osb->local_alloc_bits)) {
 657                spin_unlock(&osb->osb_lock);
 658                status = -ENOSPC;
 659                goto bail;
 660        }
 661        spin_unlock(&osb->osb_lock);
 662
 663        alloc = (struct ocfs2_dinode *) osb->local_alloc_bh->b_data;
 664
 665#ifdef CONFIG_OCFS2_DEBUG_FS
 666        if (le32_to_cpu(alloc->id1.bitmap1.i_used) !=
 667            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                            le32_to_cpu(alloc->id1.bitmap1.i_used),
 672                            ocfs2_local_alloc_count_bits(alloc));
 673                status = -EIO;
 674                goto bail;
 675        }
 676#endif
 677
 678        free_bits = le32_to_cpu(alloc->id1.bitmap1.i_total) -
 679                le32_to_cpu(alloc->id1.bitmap1.i_used);
 680        if (bits_wanted > free_bits) {
 681                /* uhoh, window change time. */
 682                status =
 683                        ocfs2_local_alloc_slide_window(osb, local_alloc_inode);
 684                if (status < 0) {
 685                        if (status != -ENOSPC)
 686                                mlog_errno(status);
 687                        goto bail;
 688                }
 689
 690                /*
 691                 * Under certain conditions, the window slide code
 692                 * might have reduced the number of bits available or
 693                 * disabled the the local alloc entirely. Re-check
 694                 * here and return -ENOSPC if necessary.
 695                 */
 696                status = -ENOSPC;
 697                if (!ocfs2_la_state_enabled(osb))
 698                        goto bail;
 699
 700                free_bits = le32_to_cpu(alloc->id1.bitmap1.i_total) -
 701                        le32_to_cpu(alloc->id1.bitmap1.i_used);
 702                if (bits_wanted > free_bits)
 703                        goto bail;
 704        }
 705
 706        ac->ac_inode = local_alloc_inode;
 707        /* We should never use localalloc from another slot */
 708        ac->ac_alloc_slot = osb->slot_num;
 709        ac->ac_which = OCFS2_AC_USE_LOCAL;
 710        get_bh(osb->local_alloc_bh);
 711        ac->ac_bh = osb->local_alloc_bh;
 712        status = 0;
 713bail:
 714        if (status < 0 && local_alloc_inode) {
 715                mutex_unlock(&local_alloc_inode->i_mutex);
 716                iput(local_alloc_inode);
 717        }
 718
 719        trace_ocfs2_reserve_local_alloc_bits(
 720                (unsigned long long)ac->ac_max_block,
 721                bits_wanted, osb->slot_num, status);
 722
 723        if (status)
 724                mlog_errno(status);
 725        return status;
 726}
 727
 728int ocfs2_claim_local_alloc_bits(struct ocfs2_super *osb,
 729                                 handle_t *handle,
 730                                 struct ocfs2_alloc_context *ac,
 731                                 u32 bits_wanted,
 732                                 u32 *bit_off,
 733                                 u32 *num_bits)
 734{
 735        int status, start;
 736        struct inode *local_alloc_inode;
 737        void *bitmap;
 738        struct ocfs2_dinode *alloc;
 739        struct ocfs2_local_alloc *la;
 740
 741        BUG_ON(ac->ac_which != OCFS2_AC_USE_LOCAL);
 742
 743        local_alloc_inode = ac->ac_inode;
 744        alloc = (struct ocfs2_dinode *) osb->local_alloc_bh->b_data;
 745        la = OCFS2_LOCAL_ALLOC(alloc);
 746
 747        start = ocfs2_local_alloc_find_clear_bits(osb, alloc, &bits_wanted,
 748                                                  ac->ac_resv);
 749        if (start == -1) {
 750                /* TODO: Shouldn't we just BUG here? */
 751                status = -ENOSPC;
 752                mlog_errno(status);
 753                goto bail;
 754        }
 755
 756        bitmap = la->la_bitmap;
 757        *bit_off = le32_to_cpu(la->la_bm_off) + start;
 758        *num_bits = bits_wanted;
 759
 760        status = ocfs2_journal_access_di(handle,
 761                                         INODE_CACHE(local_alloc_inode),
 762                                         osb->local_alloc_bh,
 763                                         OCFS2_JOURNAL_ACCESS_WRITE);
 764        if (status < 0) {
 765                mlog_errno(status);
 766                goto bail;
 767        }
 768
 769        ocfs2_resmap_claimed_bits(&osb->osb_la_resmap, ac->ac_resv, start,
 770                                  bits_wanted);
 771
 772        while(bits_wanted--)
 773                ocfs2_set_bit(start++, bitmap);
 774
 775        le32_add_cpu(&alloc->id1.bitmap1.i_used, *num_bits);
 776        ocfs2_journal_dirty(handle, osb->local_alloc_bh);
 777
 778bail:
 779        if (status)
 780                mlog_errno(status);
 781        return status;
 782}
 783
 784static u32 ocfs2_local_alloc_count_bits(struct ocfs2_dinode *alloc)
 785{
 786        u32 count;
 787        struct ocfs2_local_alloc *la = OCFS2_LOCAL_ALLOC(alloc);
 788
 789        count = memweight(la->la_bitmap, le16_to_cpu(la->la_size));
 790
 791        trace_ocfs2_local_alloc_count_bits(count);
 792        return count;
 793}
 794
 795static int ocfs2_local_alloc_find_clear_bits(struct ocfs2_super *osb,
 796                                     struct ocfs2_dinode *alloc,
 797                                     u32 *numbits,
 798                                     struct ocfs2_alloc_reservation *resv)
 799{
 800        int numfound, bitoff, left, startoff, lastzero;
 801        int local_resv = 0;
 802        struct ocfs2_alloc_reservation r;
 803        void *bitmap = NULL;
 804        struct ocfs2_reservation_map *resmap = &osb->osb_la_resmap;
 805
 806        if (!alloc->id1.bitmap1.i_total) {
 807                bitoff = -1;
 808                goto bail;
 809        }
 810
 811        if (!resv) {
 812                local_resv = 1;
 813                ocfs2_resv_init_once(&r);
 814                ocfs2_resv_set_type(&r, OCFS2_RESV_FLAG_TMP);
 815                resv = &r;
 816        }
 817
 818        numfound = *numbits;
 819        if (ocfs2_resmap_resv_bits(resmap, resv, &bitoff, &numfound) == 0) {
 820                if (numfound < *numbits)
 821                        *numbits = numfound;
 822                goto bail;
 823        }
 824
 825        /*
 826         * Code error. While reservations are enabled, local
 827         * allocation should _always_ go through them.
 828         */
 829        BUG_ON(osb->osb_resv_level != 0);
 830
 831        /*
 832         * Reservations are disabled. Handle this the old way.
 833         */
 834
 835        bitmap = OCFS2_LOCAL_ALLOC(alloc)->la_bitmap;
 836
 837        numfound = bitoff = startoff = 0;
 838        lastzero = -1;
 839        left = le32_to_cpu(alloc->id1.bitmap1.i_total);
 840        while ((bitoff = ocfs2_find_next_zero_bit(bitmap, left, startoff)) != -1) {
 841                if (bitoff == left) {
 842                        /* mlog(0, "bitoff (%d) == left", bitoff); */
 843                        break;
 844                }
 845                /* mlog(0, "Found a zero: bitoff = %d, startoff = %d, "
 846                   "numfound = %d\n", bitoff, startoff, numfound);*/
 847
 848                /* Ok, we found a zero bit... is it contig. or do we
 849                 * start over?*/
 850                if (bitoff == startoff) {
 851                        /* we found a zero */
 852                        numfound++;
 853                        startoff++;
 854                } else {
 855                        /* got a zero after some ones */
 856                        numfound = 1;
 857                        startoff = bitoff+1;
 858                }
 859                /* we got everything we needed */
 860                if (numfound == *numbits) {
 861                        /* mlog(0, "Found it all!\n"); */
 862                        break;
 863                }
 864        }
 865
 866        trace_ocfs2_local_alloc_find_clear_bits_search_bitmap(bitoff, numfound);
 867
 868        if (numfound == *numbits)
 869                bitoff = startoff - numfound;
 870        else
 871                bitoff = -1;
 872
 873bail:
 874        if (local_resv)
 875                ocfs2_resv_discard(resmap, resv);
 876
 877        trace_ocfs2_local_alloc_find_clear_bits(*numbits,
 878                le32_to_cpu(alloc->id1.bitmap1.i_total),
 879                bitoff, numfound);
 880
 881        return bitoff;
 882}
 883
 884static void ocfs2_clear_local_alloc(struct ocfs2_dinode *alloc)
 885{
 886        struct ocfs2_local_alloc *la = OCFS2_LOCAL_ALLOC(alloc);
 887        int i;
 888
 889        alloc->id1.bitmap1.i_total = 0;
 890        alloc->id1.bitmap1.i_used = 0;
 891        la->la_bm_off = 0;
 892        for(i = 0; i < le16_to_cpu(la->la_size); i++)
 893                la->la_bitmap[i] = 0;
 894}
 895
 896#if 0
 897/* turn this on and uncomment below to aid debugging window shifts. */
 898static void ocfs2_verify_zero_bits(unsigned long *bitmap,
 899                                   unsigned int start,
 900                                   unsigned int count)
 901{
 902        unsigned int tmp = count;
 903        while(tmp--) {
 904                if (ocfs2_test_bit(start + tmp, bitmap)) {
 905                        printk("ocfs2_verify_zero_bits: start = %u, count = "
 906                               "%u\n", start, count);
 907                        printk("ocfs2_verify_zero_bits: bit %u is set!",
 908                               start + tmp);
 909                        BUG();
 910                }
 911        }
 912}
 913#endif
 914
 915/*
 916 * sync the local alloc to main bitmap.
 917 *
 918 * assumes you've already locked the main bitmap -- the bitmap inode
 919 * passed is used for caching.
 920 */
 921static int ocfs2_sync_local_to_main(struct ocfs2_super *osb,
 922                                    handle_t *handle,
 923                                    struct ocfs2_dinode *alloc,
 924                                    struct inode *main_bm_inode,
 925                                    struct buffer_head *main_bm_bh)
 926{
 927        int status = 0;
 928        int bit_off, left, count, start;
 929        u64 la_start_blk;
 930        u64 blkno;
 931        void *bitmap;
 932        struct ocfs2_local_alloc *la = OCFS2_LOCAL_ALLOC(alloc);
 933
 934        trace_ocfs2_sync_local_to_main(
 935             le32_to_cpu(alloc->id1.bitmap1.i_total),
 936             le32_to_cpu(alloc->id1.bitmap1.i_used));
 937
 938        if (!alloc->id1.bitmap1.i_total) {
 939                goto bail;
 940        }
 941
 942        if (le32_to_cpu(alloc->id1.bitmap1.i_used) ==
 943            le32_to_cpu(alloc->id1.bitmap1.i_total)) {
 944                goto bail;
 945        }
 946
 947        la_start_blk = ocfs2_clusters_to_blocks(osb->sb,
 948                                                le32_to_cpu(la->la_bm_off));
 949        bitmap = la->la_bitmap;
 950        start = count = bit_off = 0;
 951        left = le32_to_cpu(alloc->id1.bitmap1.i_total);
 952
 953        while ((bit_off = ocfs2_find_next_zero_bit(bitmap, left, start))
 954               != -1) {
 955                if ((bit_off < left) && (bit_off == start)) {
 956                        count++;
 957                        start++;
 958                        continue;
 959                }
 960                if (count) {
 961                        blkno = la_start_blk +
 962                                ocfs2_clusters_to_blocks(osb->sb,
 963                                                         start - count);
 964
 965                        trace_ocfs2_sync_local_to_main_free(
 966                             count, start - count,
 967                             (unsigned long long)la_start_blk,
 968                             (unsigned long long)blkno);
 969
 970                        status = ocfs2_release_clusters(handle,
 971                                                        main_bm_inode,
 972                                                        main_bm_bh, blkno,
 973                                                        count);
 974                        if (status < 0) {
 975                                mlog_errno(status);
 976                                goto bail;
 977                        }
 978                }
 979                if (bit_off >= left)
 980                        break;
 981                count = 1;
 982                start = bit_off + 1;
 983        }
 984
 985bail:
 986        if (status)
 987                mlog_errno(status);
 988        return status;
 989}
 990
 991enum ocfs2_la_event {
 992        OCFS2_LA_EVENT_SLIDE,           /* Normal window slide. */
 993        OCFS2_LA_EVENT_FRAGMENTED,      /* The global bitmap has
 994                                         * enough bits theoretically
 995                                         * free, but a contiguous
 996                                         * allocation could not be
 997                                         * found. */
 998        OCFS2_LA_EVENT_ENOSPC,          /* Global bitmap doesn't have
 999                                         * enough bits free to satisfy
1000                                         * our request. */
1001};
1002#define OCFS2_LA_ENABLE_INTERVAL (30 * HZ)
1003/*
1004 * Given an event, calculate the size of our next local alloc window.
1005 *
1006 * This should always be called under i_mutex of the local alloc inode
1007 * so that local alloc disabling doesn't race with processes trying to
1008 * use the allocator.
1009 *
1010 * Returns the state which the local alloc was left in. This value can
1011 * be ignored by some paths.
1012 */
1013static int ocfs2_recalc_la_window(struct ocfs2_super *osb,
1014                                  enum ocfs2_la_event event)
1015{
1016        unsigned int bits;
1017        int state;
1018
1019        spin_lock(&osb->osb_lock);
1020        if (osb->local_alloc_state == OCFS2_LA_DISABLED) {
1021                WARN_ON_ONCE(osb->local_alloc_state == OCFS2_LA_DISABLED);
1022                goto out_unlock;
1023        }
1024
1025        /*
1026         * ENOSPC and fragmentation are treated similarly for now.
1027         */
1028        if (event == OCFS2_LA_EVENT_ENOSPC ||
1029            event == OCFS2_LA_EVENT_FRAGMENTED) {
1030                /*
1031                 * We ran out of contiguous space in the primary
1032                 * bitmap. Drastically reduce the number of bits used
1033                 * by local alloc until we have to disable it.
1034                 */
1035                bits = osb->local_alloc_bits >> 1;
1036                if (bits > ocfs2_megabytes_to_clusters(osb->sb, 1)) {
1037                        /*
1038                         * By setting state to THROTTLED, we'll keep
1039                         * the number of local alloc bits used down
1040                         * until an event occurs which would give us
1041                         * reason to assume the bitmap situation might
1042                         * have changed.
1043                         */
1044                        osb->local_alloc_state = OCFS2_LA_THROTTLED;
1045                        osb->local_alloc_bits = bits;
1046                } else {
1047                        osb->local_alloc_state = OCFS2_LA_DISABLED;
1048                }
1049                queue_delayed_work(ocfs2_wq, &osb->la_enable_wq,
1050                                   OCFS2_LA_ENABLE_INTERVAL);
1051                goto out_unlock;
1052        }
1053
1054        /*
1055         * Don't increase the size of the local alloc window until we
1056         * know we might be able to fulfill the request. Otherwise, we
1057         * risk bouncing around the global bitmap during periods of
1058         * low space.
1059         */
1060        if (osb->local_alloc_state != OCFS2_LA_THROTTLED)
1061                osb->local_alloc_bits = osb->local_alloc_default_bits;
1062
1063out_unlock:
1064        state = osb->local_alloc_state;
1065        spin_unlock(&osb->osb_lock);
1066
1067        return state;
1068}
1069
1070static int ocfs2_local_alloc_reserve_for_window(struct ocfs2_super *osb,
1071                                                struct ocfs2_alloc_context **ac,
1072                                                struct inode **bitmap_inode,
1073                                                struct buffer_head **bitmap_bh)
1074{
1075        int status;
1076
1077        *ac = kzalloc(sizeof(struct ocfs2_alloc_context), GFP_KERNEL);
1078        if (!(*ac)) {
1079                status = -ENOMEM;
1080                mlog_errno(status);
1081                goto bail;
1082        }
1083
1084retry_enospc:
1085        (*ac)->ac_bits_wanted = osb->local_alloc_default_bits;
1086        status = ocfs2_reserve_cluster_bitmap_bits(osb, *ac);
1087        if (status == -ENOSPC) {
1088                if (ocfs2_recalc_la_window(osb, OCFS2_LA_EVENT_ENOSPC) ==
1089                    OCFS2_LA_DISABLED)
1090                        goto bail;
1091
1092                ocfs2_free_ac_resource(*ac);
1093                memset(*ac, 0, sizeof(struct ocfs2_alloc_context));
1094                goto retry_enospc;
1095        }
1096        if (status < 0) {
1097                mlog_errno(status);
1098                goto bail;
1099        }
1100
1101        *bitmap_inode = (*ac)->ac_inode;
1102        igrab(*bitmap_inode);
1103        *bitmap_bh = (*ac)->ac_bh;
1104        get_bh(*bitmap_bh);
1105        status = 0;
1106bail:
1107        if ((status < 0) && *ac) {
1108                ocfs2_free_alloc_context(*ac);
1109                *ac = NULL;
1110        }
1111
1112        if (status)
1113                mlog_errno(status);
1114        return status;
1115}
1116
1117/*
1118 * pass it the bitmap lock in lock_bh if you have it.
1119 */
1120static int ocfs2_local_alloc_new_window(struct ocfs2_super *osb,
1121                                        handle_t *handle,
1122                                        struct ocfs2_alloc_context *ac)
1123{
1124        int status = 0;
1125        u32 cluster_off, cluster_count;
1126        struct ocfs2_dinode *alloc = NULL;
1127        struct ocfs2_local_alloc *la;
1128
1129        alloc = (struct ocfs2_dinode *) osb->local_alloc_bh->b_data;
1130        la = OCFS2_LOCAL_ALLOC(alloc);
1131
1132        trace_ocfs2_local_alloc_new_window(
1133                le32_to_cpu(alloc->id1.bitmap1.i_total),
1134                osb->local_alloc_bits);
1135
1136        /* Instruct the allocation code to try the most recently used
1137         * cluster group. We'll re-record the group used this pass
1138         * below. */
1139        ac->ac_last_group = osb->la_last_gd;
1140
1141        /* we used the generic suballoc reserve function, but we set
1142         * everything up nicely, so there's no reason why we can't use
1143         * 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        if (status == -ENOSPC) {
1147retry_enospc:
1148                /*
1149                 * Note: We could also try syncing the journal here to
1150                 * allow use of any free bits which the current
1151                 * transaction can't give us access to. --Mark
1152                 */
1153                if (ocfs2_recalc_la_window(osb, OCFS2_LA_EVENT_FRAGMENTED) ==
1154                    OCFS2_LA_DISABLED)
1155                        goto bail;
1156
1157                ac->ac_bits_wanted = osb->local_alloc_default_bits;
1158                status = ocfs2_claim_clusters(handle, ac,
1159                                              osb->local_alloc_bits,
1160                                              &cluster_off,
1161                                              &cluster_count);
1162                if (status == -ENOSPC)
1163                        goto retry_enospc;
1164                /*
1165                 * We only shrunk the *minimum* number of in our
1166                 * request - it's entirely possible that the allocator
1167                 * might give us more than we asked for.
1168                 */
1169                if (status == 0) {
1170                        spin_lock(&osb->osb_lock);
1171                        osb->local_alloc_bits = cluster_count;
1172                        spin_unlock(&osb->osb_lock);
1173                }
1174        }
1175        if (status < 0) {
1176                if (status != -ENOSPC)
1177                        mlog_errno(status);
1178                goto bail;
1179        }
1180
1181        osb->la_last_gd = ac->ac_last_group;
1182
1183        la->la_bm_off = cpu_to_le32(cluster_off);
1184        alloc->id1.bitmap1.i_total = cpu_to_le32(cluster_count);
1185        /* just in case... In the future when we find space ourselves,
1186         * we don't have to get all contiguous -- but we'll have to
1187         * set all previously used bits in bitmap and update
1188         * la_bits_set before setting the bits in the main bitmap. */
1189        alloc->id1.bitmap1.i_used = 0;
1190        memset(OCFS2_LOCAL_ALLOC(alloc)->la_bitmap, 0,
1191               le16_to_cpu(la->la_size));
1192
1193        ocfs2_resmap_restart(&osb->osb_la_resmap, cluster_count,
1194                             OCFS2_LOCAL_ALLOC(alloc)->la_bitmap);
1195
1196        trace_ocfs2_local_alloc_new_window_result(
1197                OCFS2_LOCAL_ALLOC(alloc)->la_bm_off,
1198                le32_to_cpu(alloc->id1.bitmap1.i_total));
1199
1200bail:
1201        if (status)
1202                mlog_errno(status);
1203        return status;
1204}
1205
1206/* Note that we do *NOT* lock the local alloc inode here as
1207 * it's been locked already for us. */
1208static int ocfs2_local_alloc_slide_window(struct ocfs2_super *osb,
1209                                          struct inode *local_alloc_inode)
1210{
1211        int status = 0;
1212        struct buffer_head *main_bm_bh = NULL;
1213        struct inode *main_bm_inode = NULL;
1214        handle_t *handle = NULL;
1215        struct ocfs2_dinode *alloc;
1216        struct ocfs2_dinode *alloc_copy = NULL;
1217        struct ocfs2_alloc_context *ac = NULL;
1218
1219        ocfs2_recalc_la_window(osb, OCFS2_LA_EVENT_SLIDE);
1220
1221        /* This will lock the main bitmap for us. */
1222        status = ocfs2_local_alloc_reserve_for_window(osb,
1223                                                      &ac,
1224                                                      &main_bm_inode,
1225                                                      &main_bm_bh);
1226        if (status < 0) {
1227                if (status != -ENOSPC)
1228                        mlog_errno(status);
1229                goto bail;
1230        }
1231
1232        handle = ocfs2_start_trans(osb, OCFS2_WINDOW_MOVE_CREDITS);
1233        if (IS_ERR(handle)) {
1234                status = PTR_ERR(handle);
1235                handle = NULL;
1236                mlog_errno(status);
1237                goto bail;
1238        }
1239
1240        alloc = (struct ocfs2_dinode *) osb->local_alloc_bh->b_data;
1241
1242        /* We want to clear the local alloc before doing anything
1243         * else, so that if we error later during this operation,
1244         * local alloc shutdown won't try to double free main bitmap
1245         * bits. Make a copy so the sync function knows which bits to
1246         * free. */
1247        alloc_copy = kmalloc(osb->local_alloc_bh->b_size, GFP_NOFS);
1248        if (!alloc_copy) {
1249                status = -ENOMEM;
1250                mlog_errno(status);
1251                goto bail;
1252        }
1253        memcpy(alloc_copy, alloc, osb->local_alloc_bh->b_size);
1254
1255        status = ocfs2_journal_access_di(handle,
1256                                         INODE_CACHE(local_alloc_inode),
1257                                         osb->local_alloc_bh,
1258                                         OCFS2_JOURNAL_ACCESS_WRITE);
1259        if (status < 0) {
1260                mlog_errno(status);
1261                goto bail;
1262        }
1263
1264        ocfs2_clear_local_alloc(alloc);
1265        ocfs2_journal_dirty(handle, osb->local_alloc_bh);
1266
1267        status = ocfs2_sync_local_to_main(osb, handle, alloc_copy,
1268                                          main_bm_inode, main_bm_bh);
1269        if (status < 0) {
1270                mlog_errno(status);
1271                goto bail;
1272        }
1273
1274        status = ocfs2_local_alloc_new_window(osb, handle, ac);
1275        if (status < 0) {
1276                if (status != -ENOSPC)
1277                        mlog_errno(status);
1278                goto bail;
1279        }
1280
1281        atomic_inc(&osb->alloc_stats.moves);
1282
1283bail:
1284        if (handle)
1285                ocfs2_commit_trans(osb, handle);
1286
1287        brelse(main_bm_bh);
1288
1289        if (main_bm_inode)
1290                iput(main_bm_inode);
1291
1292        kfree(alloc_copy);
1293
1294        if (ac)
1295                ocfs2_free_alloc_context(ac);
1296
1297        if (status)
1298                mlog_errno(status);
1299        return status;
1300}
1301
1302
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