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        if (alloc_copy)
 480                kfree(alloc_copy);
 481}
 482
 483/*
 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
 489 */
 490int ocfs2_begin_local_alloc_recovery(struct ocfs2_super *osb,
 491                                     int slot_num,
 492                                     struct ocfs2_dinode **alloc_copy)
 493{
 494        int status = 0;
 495        struct buffer_head *alloc_bh = NULL;
 496        struct inode *inode = NULL;
 497        struct ocfs2_dinode *alloc;
 498
 499        trace_ocfs2_begin_local_alloc_recovery(slot_num);
 500
 501        *alloc_copy = NULL;
 502
 503        inode = ocfs2_get_system_file_inode(osb,
 504                                            LOCAL_ALLOC_SYSTEM_INODE,
 505                                            slot_num);
 506        if (!inode) {
 507                status = -EINVAL;
 508                mlog_errno(status);
 509                goto bail;
 510        }
 511
 512        mutex_lock(&inode->i_mutex);
 513
 514        status = ocfs2_read_inode_block_full(inode, &alloc_bh,
 515                                             OCFS2_BH_IGNORE_CACHE);
 516        if (status < 0) {
 517                mlog_errno(status);
 518                goto bail;
 519        }
 520
 521        *alloc_copy = kmalloc(alloc_bh->b_size, GFP_KERNEL);
 522        if (!(*alloc_copy)) {
 523                status = -ENOMEM;
 524                goto bail;
 525        }
 526        memcpy((*alloc_copy), alloc_bh->b_data, alloc_bh->b_size);
 527
 528        alloc = (struct ocfs2_dinode *) alloc_bh->b_data;
 529        ocfs2_clear_local_alloc(alloc);
 530
 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));
 533        if (status < 0)
 534                mlog_errno(status);
 535
 536bail:
 537        if ((status < 0) && (*alloc_copy)) {
 538                kfree(*alloc_copy);
 539                *alloc_copy = NULL;
 540        }
 541
 542        brelse(alloc_bh);
 543
 544        if (inode) {
 545                mutex_unlock(&inode->i_mutex);
 546                iput(inode);
 547        }
 548
 549        if (status)
 550                mlog_errno(status);
 551        return status;
 552}
 553
 554/*
 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
 558 * main bitmap.
 559 */
 560int ocfs2_complete_local_alloc_recovery(struct ocfs2_super *osb,
 561                                        struct ocfs2_dinode *alloc)
 562{
 563        int status;
 564        handle_t *handle;
 565        struct buffer_head *main_bm_bh = NULL;
 566        struct inode *main_bm_inode;
 567
 568        main_bm_inode = ocfs2_get_system_file_inode(osb,
 569                                                    GLOBAL_BITMAP_SYSTEM_INODE,
 570                                                    OCFS2_INVALID_SLOT);
 571        if (!main_bm_inode) {
 572                status = -EINVAL;
 573                mlog_errno(status);
 574                goto out;
 575        }
 576
 577        mutex_lock(&main_bm_inode->i_mutex);
 578
 579        status = ocfs2_inode_lock(main_bm_inode, &main_bm_bh, 1);
 580        if (status < 0) {
 581                mlog_errno(status);
 582                goto out_mutex;
 583        }
 584
 585        handle = ocfs2_start_trans(osb, OCFS2_WINDOW_MOVE_CREDITS);
 586        if (IS_ERR(handle)) {
 587                status = PTR_ERR(handle);
 588                handle = NULL;
 589                mlog_errno(status);
 590                goto out_unlock;
 591        }
 592
 593        /* we want the bitmap change to be recorded on disk asap */
 594        handle->h_sync = 1;
 595
 596        status = ocfs2_sync_local_to_main(osb, handle, alloc,
 597                                          main_bm_inode, main_bm_bh);
 598        if (status < 0)
 599                mlog_errno(status);
 600
 601        ocfs2_commit_trans(osb, handle);
 602
 603out_unlock:
 604        ocfs2_inode_unlock(main_bm_inode, 1);
 605
 606out_mutex:
 607        mutex_unlock(&main_bm_inode->i_mutex);
 608
 609        brelse(main_bm_bh);
 610
 611        iput(main_bm_inode);
 612
 613out:
 614        if (!status)
 615                ocfs2_init_steal_slots(osb);
 616        if (status)
 617                mlog_errno(status);
 618        return status;
 619}
 620
 621/*
 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.
 624 *
 625 * We will add ourselves to the transaction passed in, but may start
 626 * our own in order to shift windows.
 627 */
 628int ocfs2_reserve_local_alloc_bits(struct ocfs2_super *osb,
 629                                   u32 bits_wanted,
 630                                   struct ocfs2_alloc_context *ac)
 631{
 632        int status;
 633        struct ocfs2_dinode *alloc;
 634        struct inode *local_alloc_inode;
 635        unsigned int free_bits;
 636
 637        BUG_ON(!ac);
 638
 639        local_alloc_inode =
 640                ocfs2_get_system_file_inode(osb,
 641                                            LOCAL_ALLOC_SYSTEM_INODE,
 642                                            osb->slot_num);
 643        if (!local_alloc_inode) {
 644                status = -ENOENT;
 645                mlog_errno(status);
 646                goto bail;
 647        }
 648
 649        mutex_lock(&local_alloc_inode->i_mutex);
 650
 651        /*
 652         * We must double check state and allocator bits because
 653         * another process may have changed them while holding i_mutex.
 654         */
 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);
 659                status = -ENOSPC;
 660                goto bail;
 661        }
 662        spin_unlock(&osb->osb_lock);
 663
 664        alloc = (struct ocfs2_dinode *) osb->local_alloc_bh->b_data;
 665
 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));
 674                status = -EIO;
 675                goto bail;
 676        }
 677#endif
 678
 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. */
 683                status =
 684                        ocfs2_local_alloc_slide_window(osb, local_alloc_inode);
 685                if (status < 0) {
 686                        if (status != -ENOSPC)
 687                                mlog_errno(status);
 688                        goto bail;
 689                }
 690
 691                /*
 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.
 696                 */
 697                status = -ENOSPC;
 698                if (!ocfs2_la_state_enabled(osb))
 699                        goto bail;
 700
 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)
 704                        goto bail;
 705        }
 706
 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;
 713        status = 0;
 714bail:
 715        if (status < 0 && local_alloc_inode) {
 716                mutex_unlock(&local_alloc_inode->i_mutex);
 717                iput(local_alloc_inode);
 718        }
 719
 720        trace_ocfs2_reserve_local_alloc_bits(
 721                (unsigned long long)ac->ac_max_block,
 722                bits_wanted, osb->slot_num, status);
 723
 724        if (status)
 725                mlog_errno(status);
 726        return status;
 727}
 728
 729int ocfs2_claim_local_alloc_bits(struct ocfs2_super *osb,
 730                                 handle_t *handle,
 731                                 struct ocfs2_alloc_context *ac,
 732                                 u32 bits_wanted,
 733                                 u32 *bit_off,
 734                                 u32 *num_bits)
 735{
 736        int status, start;
 737        struct inode *local_alloc_inode;
 738        void *bitmap;
 739        struct ocfs2_dinode *alloc;
 740        struct ocfs2_local_alloc *la;
 741
 742        BUG_ON(ac->ac_which != OCFS2_AC_USE_LOCAL);
 743
 744        local_alloc_inode = ac->ac_inode;
 745        alloc = (struct ocfs2_dinode *) osb->local_alloc_bh->b_data;
 746        la = OCFS2_LOCAL_ALLOC(alloc);
 747
 748        start = ocfs2_local_alloc_find_clear_bits(osb, alloc, &bits_wanted,
 749                                                  ac->ac_resv);
 750        if (start == -1) {
 751                /* TODO: Shouldn't we just BUG here? */
 752                status = -ENOSPC;
 753                mlog_errno(status);
 754                goto bail;
 755        }
 756
 757        bitmap = la->la_bitmap;
 758        *bit_off = le32_to_cpu(la->la_bm_off) + start;
 759        *num_bits = bits_wanted;
 760
 761        status = ocfs2_journal_access_di(handle,
 762                                         INODE_CACHE(local_alloc_inode),
 763                                         osb->local_alloc_bh,
 764                                         OCFS2_JOURNAL_ACCESS_WRITE);
 765        if (status < 0) {
 766                mlog_errno(status);
 767                goto bail;
 768        }
 769
 770        ocfs2_resmap_claimed_bits(&osb->osb_la_resmap, ac->ac_resv, start,
 771                                  bits_wanted);
 772
 773        while(bits_wanted--)
 774                ocfs2_set_bit(start++, bitmap);
 775
 776        le32_add_cpu(&alloc->id1.bitmap1.i_used, *num_bits);
 777        ocfs2_journal_dirty(handle, osb->local_alloc_bh);
 778
 779bail:
 780        if (status)
 781                mlog_errno(status);
 782        return status;
 783}
 784
 785static u32 ocfs2_local_alloc_count_bits(struct ocfs2_dinode *alloc)
 786{
 787        u32 count;
 788        struct ocfs2_local_alloc *la = OCFS2_LOCAL_ALLOC(alloc);
 789
 790        count = memweight(la->la_bitmap, le16_to_cpu(la->la_size));
 791
 792        trace_ocfs2_local_alloc_count_bits(count);
 793        return count;
 794}
 795
 796static int ocfs2_local_alloc_find_clear_bits(struct ocfs2_super *osb,
 797                                     struct ocfs2_dinode *alloc,
 798                                     u32 *numbits,
 799                                     struct ocfs2_alloc_reservation *resv)
 800{
 801        int numfound, bitoff, left, startoff, lastzero;
 802        int local_resv = 0;
 803        struct ocfs2_alloc_reservation r;
 804        void *bitmap = NULL;
 805        struct ocfs2_reservation_map *resmap = &osb->osb_la_resmap;
 806
 807        if (!alloc->id1.bitmap1.i_total) {
 808                bitoff = -1;
 809                goto bail;
 810        }
 811
 812        if (!resv) {
 813                local_resv = 1;
 814                ocfs2_resv_init_once(&r);
 815                ocfs2_resv_set_type(&r, OCFS2_RESV_FLAG_TMP);
 816                resv = &r;
 817        }
 818
 819        numfound = *numbits;
 820        if (ocfs2_resmap_resv_bits(resmap, resv, &bitoff, &numfound) == 0) {
 821                if (numfound < *numbits)
 822                        *numbits = numfound;
 823                goto bail;
 824        }
 825
 826        /*
 827         * Code error. While reservations are enabled, local
 828         * allocation should _always_ go through them.
 829         */
 830        BUG_ON(osb->osb_resv_level != 0);
 831
 832        /*
 833         * Reservations are disabled. Handle this the old way.
 834         */
 835
 836        bitmap = OCFS2_LOCAL_ALLOC(alloc)->la_bitmap;
 837
 838        numfound = bitoff = startoff = 0;
 839        lastzero = -1;
 840        left = le32_to_cpu(alloc->id1.bitmap1.i_total);
 841        while ((bitoff = ocfs2_find_next_zero_bit(bitmap, left, startoff)) != -1) {
 842                if (bitoff == left) {
 843                        /* mlog(0, "bitoff (%d) == left", bitoff); */
 844                        break;
 845                }
 846                /* mlog(0, "Found a zero: bitoff = %d, startoff = %d, "
 847                   "numfound = %d\n", bitoff, startoff, numfound);*/
 848
 849                /* Ok, we found a zero bit... is it contig. or do we
 850                 * start over?*/
 851                if (bitoff == startoff) {
 852                        /* we found a zero */
 853                        numfound++;
 854                        startoff++;
 855                } else {
 856                        /* got a zero after some ones */
 857                        numfound = 1;
 858                        startoff = bitoff+1;
 859                }
 860                /* we got everything we needed */
 861                if (numfound == *numbits) {
 862                        /* mlog(0, "Found it all!\n"); */
 863                        break;
 864                }
 865        }
 866
 867        trace_ocfs2_local_alloc_find_clear_bits_search_bitmap(bitoff, numfound);
 868
 869        if (numfound == *numbits)
 870                bitoff = startoff - numfound;
 871        else
 872                bitoff = -1;
 873
 874bail:
 875        if (local_resv)
 876                ocfs2_resv_discard(resmap, resv);
 877
 878        trace_ocfs2_local_alloc_find_clear_bits(*numbits,
 879                le32_to_cpu(alloc->id1.bitmap1.i_total),
 880                bitoff, numfound);
 881
 882        return bitoff;
 883}
 884
 885static void ocfs2_clear_local_alloc(struct ocfs2_dinode *alloc)
 886{
 887        struct ocfs2_local_alloc *la = OCFS2_LOCAL_ALLOC(alloc);
 888        int i;
 889
 890        alloc->id1.bitmap1.i_total = 0;
 891        alloc->id1.bitmap1.i_used = 0;
 892        la->la_bm_off = 0;
 893        for(i = 0; i < le16_to_cpu(la->la_size); i++)
 894                la->la_bitmap[i] = 0;
 895}
 896
 897#if 0
 898/* turn this on and uncomment below to aid debugging window shifts. */
 899static void ocfs2_verify_zero_bits(unsigned long *bitmap,
 900                                   unsigned int start,
 901                                   unsigned int count)
 902{
 903        unsigned int tmp = count;
 904        while(tmp--) {
 905                if (ocfs2_test_bit(start + tmp, bitmap)) {
 906                        printk("ocfs2_verify_zero_bits: start = %u, count = "
 907                               "%u\n", start, count);
 908                        printk("ocfs2_verify_zero_bits: bit %u is set!",
 909                               start + tmp);
 910                        BUG();
 911                }
 912        }
 913}
 914#endif
 915
 916/*
 917 * sync the local alloc to main bitmap.
 918 *
 919 * assumes you've already locked the main bitmap -- the bitmap inode
 920 * passed is used for caching.
 921 */
 922static int ocfs2_sync_local_to_main(struct ocfs2_super *osb,
 923                                    handle_t *handle,
 924                                    struct ocfs2_dinode *alloc,
 925                                    struct inode *main_bm_inode,
 926                                    struct buffer_head *main_bm_bh)
 927{
 928        int status = 0;
 929        int bit_off, left, count, start;
 930        u64 la_start_blk;
 931        u64 blkno;
 932        void *bitmap;
 933        struct ocfs2_local_alloc *la = OCFS2_LOCAL_ALLOC(alloc);
 934
 935        trace_ocfs2_sync_local_to_main(
 936             le32_to_cpu(alloc->id1.bitmap1.i_total),
 937             le32_to_cpu(alloc->id1.bitmap1.i_used));
 938
 939        if (!alloc->id1.bitmap1.i_total) {
 940                goto bail;
 941        }
 942
 943        if (le32_to_cpu(alloc->id1.bitmap1.i_used) ==
 944            le32_to_cpu(alloc->id1.bitmap1.i_total)) {
 945                goto bail;
 946        }
 947
 948        la_start_blk = ocfs2_clusters_to_blocks(osb->sb,
 949                                                le32_to_cpu(la->la_bm_off));
 950        bitmap = la->la_bitmap;
 951        start = count = bit_off = 0;
 952        left = le32_to_cpu(alloc->id1.bitmap1.i_total);
 953
 954        while ((bit_off = ocfs2_find_next_zero_bit(bitmap, left, start))
 955               != -1) {
 956                if ((bit_off < left) && (bit_off == start)) {
 957                        count++;
 958                        start++;
 959                        continue;
 960                }
 961                if (count) {
 962                        blkno = la_start_blk +
 963                                ocfs2_clusters_to_blocks(osb->sb,
 964                                                         start - count);
 965
 966                        trace_ocfs2_sync_local_to_main_free(
 967                             count, start - count,
 968                             (unsigned long long)la_start_blk,
 969                             (unsigned long long)blkno);
 970
 971                        status = ocfs2_release_clusters(handle,
 972                                                        main_bm_inode,
 973                                                        main_bm_bh, blkno,
 974                                                        count);
 975                        if (status < 0) {
 976                                mlog_errno(status);
 977                                goto bail;
 978                        }
 979                }
 980                if (bit_off >= left)
 981                        break;
 982                count = 1;
 983                start = bit_off + 1;
 984        }
 985
 986bail:
 987        if (status)
 988                mlog_errno(status);
 989        return status;
 990}
 991
 992enum ocfs2_la_event {
 993        OCFS2_LA_EVENT_SLIDE,           /* Normal window slide. */
 994        OCFS2_LA_EVENT_FRAGMENTED,      /* The global bitmap has
 995                                         * enough bits theoretically
 996                                         * free, but a contiguous
 997                                         * allocation could not be
 998                                         * found. */
 999        OCFS2_LA_EVENT_ENOSPC,          /* Global bitmap doesn't have
1000                                         * enough bits free to satisfy
1001                                         * our request. */
1002};
1003#define OCFS2_LA_ENABLE_INTERVAL (30 * HZ)
1004/*
1005 * Given an event, calculate the size of our next local alloc window.
1006 *
1007 * This should always be called under i_mutex of the local alloc inode
1008 * so that local alloc disabling doesn't race with processes trying to
1009 * use the allocator.
1010 *
1011 * Returns the state which the local alloc was left in. This value can
1012 * be ignored by some paths.
1013 */
1014static int ocfs2_recalc_la_window(struct ocfs2_super *osb,
1015                                  enum ocfs2_la_event event)
1016{
1017        unsigned int bits;
1018        int state;
1019
1020        spin_lock(&osb->osb_lock);
1021        if (osb->local_alloc_state == OCFS2_LA_DISABLED) {
1022                WARN_ON_ONCE(osb->local_alloc_state == OCFS2_LA_DISABLED);
1023                goto out_unlock;
1024        }
1025
1026        /*
1027         * ENOSPC and fragmentation are treated similarly for now.
1028         */
1029        if (event == OCFS2_LA_EVENT_ENOSPC ||
1030            event == OCFS2_LA_EVENT_FRAGMENTED) {
1031                /*
1032                 * We ran out of contiguous space in the primary
1033                 * bitmap. Drastically reduce the number of bits used
1034                 * by local alloc until we have to disable it.
1035                 */
1036                bits = osb->local_alloc_bits >> 1;
1037                if (bits > ocfs2_megabytes_to_clusters(osb->sb, 1)) {
1038                        /*
1039                         * By setting state to THROTTLED, we'll keep
1040                         * the number of local alloc bits used down
1041                         * until an event occurs which would give us
1042                         * reason to assume the bitmap situation might
1043                         * have changed.
1044                         */
1045                        osb->local_alloc_state = OCFS2_LA_THROTTLED;
1046                        osb->local_alloc_bits = bits;
1047                } else {
1048                        osb->local_alloc_state = OCFS2_LA_DISABLED;
1049                }
1050                queue_delayed_work(ocfs2_wq, &osb->la_enable_wq,
1051                                   OCFS2_LA_ENABLE_INTERVAL);
1052                goto out_unlock;
1053        }
1054
1055        /*
1056         * Don't increase the size of the local alloc window until we
1057         * know we might be able to fulfill the request. Otherwise, we
1058         * risk bouncing around the global bitmap during periods of
1059         * low space.
1060         */
1061        if (osb->local_alloc_state != OCFS2_LA_THROTTLED)
1062                osb->local_alloc_bits = osb->local_alloc_default_bits;
1063
1064out_unlock:
1065        state = osb->local_alloc_state;
1066        spin_unlock(&osb->osb_lock);
1067
1068        return state;
1069}
1070
1071static int ocfs2_local_alloc_reserve_for_window(struct ocfs2_super *osb,
1072                                                struct ocfs2_alloc_context **ac,
1073                                                struct inode **bitmap_inode,
1074                                                struct buffer_head **bitmap_bh)
1075{
1076        int status;
1077
1078        *ac = kzalloc(sizeof(struct ocfs2_alloc_context), GFP_KERNEL);
1079        if (!(*ac)) {
1080                status = -ENOMEM;
1081                mlog_errno(status);
1082                goto bail;
1083        }
1084
1085retry_enospc:
1086        (*ac)->ac_bits_wanted = osb->local_alloc_default_bits;
1087        status = ocfs2_reserve_cluster_bitmap_bits(osb, *ac);
1088        if (status == -ENOSPC) {
1089                if (ocfs2_recalc_la_window(osb, OCFS2_LA_EVENT_ENOSPC) ==
1090                    OCFS2_LA_DISABLED)
1091                        goto bail;
1092
1093                ocfs2_free_ac_resource(*ac);
1094                memset(*ac, 0, sizeof(struct ocfs2_alloc_context));
1095                goto retry_enospc;
1096        }
1097        if (status < 0) {
1098                mlog_errno(status);
1099                goto bail;
1100        }
1101
1102        *bitmap_inode = (*ac)->ac_inode;
1103        igrab(*bitmap_inode);
1104        *bitmap_bh = (*ac)->ac_bh;
1105        get_bh(*bitmap_bh);
1106        status = 0;
1107bail:
1108        if ((status < 0) && *ac) {
1109                ocfs2_free_alloc_context(*ac);
1110                *ac = NULL;
1111        }
1112
1113        if (status)
1114                mlog_errno(status);
1115        return status;
1116}
1117
1118/*
1119 * pass it the bitmap lock in lock_bh if you have it.
1120 */
1121static int ocfs2_local_alloc_new_window(struct ocfs2_super *osb,
1122                                        handle_t *handle,
1123                                        struct ocfs2_alloc_context *ac)
1124{
1125        int status = 0;
1126        u32 cluster_off, cluster_count;
1127        struct ocfs2_dinode *alloc = NULL;
1128        struct ocfs2_local_alloc *la;
1129
1130        alloc = (struct ocfs2_dinode *) osb->local_alloc_bh->b_data;
1131        la = OCFS2_LOCAL_ALLOC(alloc);
1132
1133        trace_ocfs2_local_alloc_new_window(
1134                le32_to_cpu(alloc->id1.bitmap1.i_total),
1135                osb->local_alloc_bits);
1136
1137        /* Instruct the allocation code to try the most recently used
1138         * cluster group. We'll re-record the group used this pass
1139         * below. */
1140        ac->ac_last_group = osb->la_last_gd;
1141
1142        /* we used the generic suballoc reserve function, but we set
1143         * everything up nicely, so there's no reason why we can't use
1144         * the more specific cluster api to claim bits. */
1145        status = ocfs2_claim_clusters(handle, ac, osb->local_alloc_bits,
1146                                      &cluster_off, &cluster_count);
1147        if (status == -ENOSPC) {
1148retry_enospc:
1149                /*
1150                 * Note: We could also try syncing the journal here to
1151                 * allow use of any free bits which the current
1152                 * transaction can't give us access to. --Mark
1153                 */
1154                if (ocfs2_recalc_la_window(osb, OCFS2_LA_EVENT_FRAGMENTED) ==
1155                    OCFS2_LA_DISABLED)
1156                        goto bail;
1157
1158                ac->ac_bits_wanted = osb->local_alloc_default_bits;
1159                status = ocfs2_claim_clusters(handle, ac,
1160                                              osb->local_alloc_bits,
1161                                              &cluster_off,
1162                                              &cluster_count);
1163                if (status == -ENOSPC)
1164                        goto retry_enospc;
1165                /*
1166                 * We only shrunk the *minimum* number of in our
1167                 * request - it's entirely possible that the allocator
1168                 * might give us more than we asked for.
1169                 */
1170                if (status == 0) {
1171                        spin_lock(&osb->osb_lock);
1172                        osb->local_alloc_bits = cluster_count;
1173                        spin_unlock(&osb->osb_lock);
1174                }
1175        }
1176        if (status < 0) {
1177                if (status != -ENOSPC)
1178                        mlog_errno(status);
1179                goto bail;
1180        }
1181
1182        osb->la_last_gd = ac->ac_last_group;
1183
1184        la->la_bm_off = cpu_to_le32(cluster_off);
1185        alloc->id1.bitmap1.i_total = cpu_to_le32(cluster_count);
1186        /* just in case... In the future when we find space ourselves,
1187         * we don't have to get all contiguous -- but we'll have to
1188         * set all previously used bits in bitmap and update
1189         * la_bits_set before setting the bits in the main bitmap. */
1190        alloc->id1.bitmap1.i_used = 0;
1191        memset(OCFS2_LOCAL_ALLOC(alloc)->la_bitmap, 0,
1192               le16_to_cpu(la->la_size));
1193
1194        ocfs2_resmap_restart(&osb->osb_la_resmap, cluster_count,
1195                             OCFS2_LOCAL_ALLOC(alloc)->la_bitmap);
1196
1197        trace_ocfs2_local_alloc_new_window_result(
1198                OCFS2_LOCAL_ALLOC(alloc)->la_bm_off,
1199                le32_to_cpu(alloc->id1.bitmap1.i_total));
1200
1201bail:
1202        if (status)
1203                mlog_errno(status);
1204        return status;
1205}
1206
1207/* Note that we do *NOT* lock the local alloc inode here as
1208 * it's been locked already for us. */
1209static int ocfs2_local_alloc_slide_window(struct ocfs2_super *osb,
1210                                          struct inode *local_alloc_inode)
1211{
1212        int status = 0;
1213        struct buffer_head *main_bm_bh = NULL;
1214        struct inode *main_bm_inode = NULL;
1215        handle_t *handle = NULL;
1216        struct ocfs2_dinode *alloc;
1217        struct ocfs2_dinode *alloc_copy = NULL;
1218        struct ocfs2_alloc_context *ac = NULL;
1219
1220        ocfs2_recalc_la_window(osb, OCFS2_LA_EVENT_SLIDE);
1221
1222        /* This will lock the main bitmap for us. */
1223        status = ocfs2_local_alloc_reserve_for_window(osb,
1224                                                      &ac,
1225                                                      &main_bm_inode,
1226                                                      &main_bm_bh);
1227        if (status < 0) {
1228                if (status != -ENOSPC)
1229                        mlog_errno(status);
1230                goto bail;
1231        }
1232
1233        handle = ocfs2_start_trans(osb, OCFS2_WINDOW_MOVE_CREDITS);
1234        if (IS_ERR(handle)) {
1235                status = PTR_ERR(handle);
1236                handle = NULL;
1237                mlog_errno(status);
1238                goto bail;
1239        }
1240
1241        alloc = (struct ocfs2_dinode *) osb->local_alloc_bh->b_data;
1242
1243        /* We want to clear the local alloc before doing anything
1244         * else, so that if we error later during this operation,
1245         * local alloc shutdown won't try to double free main bitmap
1246         * bits. Make a copy so the sync function knows which bits to
1247         * free. */
1248        alloc_copy = kmalloc(osb->local_alloc_bh->b_size, GFP_NOFS);
1249        if (!alloc_copy) {
1250                status = -ENOMEM;
1251                mlog_errno(status);
1252                goto bail;
1253        }
1254        memcpy(alloc_copy, alloc, osb->local_alloc_bh->b_size);
1255
1256        status = ocfs2_journal_access_di(handle,
1257                                         INODE_CACHE(local_alloc_inode),
1258                                         osb->local_alloc_bh,
1259                                         OCFS2_JOURNAL_ACCESS_WRITE);
1260        if (status < 0) {
1261                mlog_errno(status);
1262                goto bail;
1263        }
1264
1265        ocfs2_clear_local_alloc(alloc);
1266        ocfs2_journal_dirty(handle, osb->local_alloc_bh);
1267
1268        status = ocfs2_sync_local_to_main(osb, handle, alloc_copy,
1269                                          main_bm_inode, main_bm_bh);
1270        if (status < 0) {
1271                mlog_errno(status);
1272                goto bail;
1273        }
1274
1275        status = ocfs2_local_alloc_new_window(osb, handle, ac);
1276        if (status < 0) {
1277                if (status != -ENOSPC)
1278                        mlog_errno(status);
1279                goto bail;
1280        }
1281
1282        atomic_inc(&osb->alloc_stats.moves);
1283
1284bail:
1285        if (handle)
1286                ocfs2_commit_trans(osb, handle);
1287
1288        brelse(main_bm_bh);
1289
1290        if (main_bm_inode)
1291                iput(main_bm_inode);
1292
1293        if (alloc_copy)
1294                kfree(alloc_copy);
1295
1296        if (ac)
1297                ocfs2_free_alloc_context(ac);
1298
1299        if (status)
1300                mlog_errno(status);
1301        return status;
1302}
1303
1304
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