linux/fs/ocfs2/localalloc.c
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   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/* -*- mode: c; c-basic-offset: 8; -*-
   3 * vim: noexpandtab sw=8 ts=8 sts=0:
   4 *
   5 * localalloc.c
   6 *
   7 * Node local data allocation
   8 *
   9 * Copyright (C) 2002, 2004 Oracle.  All rights reserved.
  10 */
  11
  12#include <linux/fs.h>
  13#include <linux/types.h>
  14#include <linux/slab.h>
  15#include <linux/highmem.h>
  16#include <linux/bitops.h>
  17
  18#include <cluster/masklog.h>
  19
  20#include "ocfs2.h"
  21
  22#include "alloc.h"
  23#include "blockcheck.h"
  24#include "dlmglue.h"
  25#include "inode.h"
  26#include "journal.h"
  27#include "localalloc.h"
  28#include "suballoc.h"
  29#include "super.h"
  30#include "sysfile.h"
  31#include "ocfs2_trace.h"
  32
  33#include "buffer_head_io.h"
  34
  35#define OCFS2_LOCAL_ALLOC(dinode)       (&((dinode)->id2.i_lab))
  36
  37static u32 ocfs2_local_alloc_count_bits(struct ocfs2_dinode *alloc);
  38
  39static int ocfs2_local_alloc_find_clear_bits(struct ocfs2_super *osb,
  40                                             struct ocfs2_dinode *alloc,
  41                                             u32 *numbits,
  42                                             struct ocfs2_alloc_reservation *resv);
  43
  44static void ocfs2_clear_local_alloc(struct ocfs2_dinode *alloc);
  45
  46static int ocfs2_sync_local_to_main(struct ocfs2_super *osb,
  47                                    handle_t *handle,
  48                                    struct ocfs2_dinode *alloc,
  49                                    struct inode *main_bm_inode,
  50                                    struct buffer_head *main_bm_bh);
  51
  52static int ocfs2_local_alloc_reserve_for_window(struct ocfs2_super *osb,
  53                                                struct ocfs2_alloc_context **ac,
  54                                                struct inode **bitmap_inode,
  55                                                struct buffer_head **bitmap_bh);
  56
  57static int ocfs2_local_alloc_new_window(struct ocfs2_super *osb,
  58                                        handle_t *handle,
  59                                        struct ocfs2_alloc_context *ac);
  60
  61static int ocfs2_local_alloc_slide_window(struct ocfs2_super *osb,
  62                                          struct inode *local_alloc_inode);
  63
  64/*
  65 * ocfs2_la_default_mb() - determine a default size, in megabytes of
  66 * the local alloc.
  67 *
  68 * Generally, we'd like to pick as large a local alloc as
  69 * possible. Performance on large workloads tends to scale
  70 * proportionally to la size. In addition to that, the reservations
  71 * code functions more efficiently as it can reserve more windows for
  72 * write.
  73 *
  74 * Some things work against us when trying to choose a large local alloc:
  75 *
  76 * - We need to ensure our sizing is picked to leave enough space in
  77 *   group descriptors for other allocations (such as block groups,
  78 *   etc). Picking default sizes which are a multiple of 4 could help
  79 *   - block groups are allocated in 2mb and 4mb chunks.
  80 *
  81 * - Likewise, we don't want to starve other nodes of bits on small
  82 *   file systems. This can easily be taken care of by limiting our
  83 *   default to a reasonable size (256M) on larger cluster sizes.
  84 *
  85 * - Some file systems can't support very large sizes - 4k and 8k in
  86 *   particular are limited to less than 128 and 256 megabytes respectively.
  87 *
  88 * The following reference table shows group descriptor and local
  89 * alloc maximums at various cluster sizes (4k blocksize)
  90 *
  91 * csize: 4K    group: 126M     la: 121M
  92 * csize: 8K    group: 252M     la: 243M
  93 * csize: 16K   group: 504M     la: 486M
  94 * csize: 32K   group: 1008M    la: 972M
  95 * csize: 64K   group: 2016M    la: 1944M
  96 * csize: 128K  group: 4032M    la: 3888M
  97 * csize: 256K  group: 8064M    la: 7776M
  98 * csize: 512K  group: 16128M   la: 15552M
  99 * csize: 1024K group: 32256M   la: 31104M
 100 */
 101#define OCFS2_LA_MAX_DEFAULT_MB 256
 102#define OCFS2_LA_OLD_DEFAULT    8
 103unsigned int ocfs2_la_default_mb(struct ocfs2_super *osb)
 104{
 105        unsigned int la_mb;
 106        unsigned int gd_mb;
 107        unsigned int la_max_mb;
 108        unsigned int megs_per_slot;
 109        struct super_block *sb = osb->sb;
 110
 111        gd_mb = ocfs2_clusters_to_megabytes(osb->sb,
 112                8 * ocfs2_group_bitmap_size(sb, 0, osb->s_feature_incompat));
 113
 114        /*
 115         * This takes care of files systems with very small group
 116         * descriptors - 512 byte blocksize at cluster sizes lower
 117         * than 16K and also 1k blocksize with 4k cluster size.
 118         */
 119        if ((sb->s_blocksize == 512 && osb->s_clustersize <= 8192)
 120            || (sb->s_blocksize == 1024 && osb->s_clustersize == 4096))
 121                return OCFS2_LA_OLD_DEFAULT;
 122
 123        /*
 124         * Leave enough room for some block groups and make the final
 125         * value we work from a multiple of 4.
 126         */
 127        gd_mb -= 16;
 128        gd_mb &= 0xFFFFFFFB;
 129
 130        la_mb = gd_mb;
 131
 132        /*
 133         * Keep window sizes down to a reasonable default
 134         */
 135        if (la_mb > OCFS2_LA_MAX_DEFAULT_MB) {
 136                /*
 137                 * Some clustersize / blocksize combinations will have
 138                 * given us a larger than OCFS2_LA_MAX_DEFAULT_MB
 139                 * default size, but get poor distribution when
 140                 * limited to exactly 256 megabytes.
 141                 *
 142                 * As an example, 16K clustersize at 4K blocksize
 143                 * gives us a cluster group size of 504M. Paring the
 144                 * local alloc size down to 256 however, would give us
 145                 * only one window and around 200MB left in the
 146                 * cluster group. Instead, find the first size below
 147                 * 256 which would give us an even distribution.
 148                 *
 149                 * Larger cluster group sizes actually work out pretty
 150                 * well when pared to 256, so we don't have to do this
 151                 * for any group that fits more than two
 152                 * OCFS2_LA_MAX_DEFAULT_MB windows.
 153                 */
 154                if (gd_mb > (2 * OCFS2_LA_MAX_DEFAULT_MB))
 155                        la_mb = 256;
 156                else {
 157                        unsigned int gd_mult = gd_mb;
 158
 159                        while (gd_mult > 256)
 160                                gd_mult = gd_mult >> 1;
 161
 162                        la_mb = gd_mult;
 163                }
 164        }
 165
 166        megs_per_slot = osb->osb_clusters_at_boot / osb->max_slots;
 167        megs_per_slot = ocfs2_clusters_to_megabytes(osb->sb, megs_per_slot);
 168        /* Too many nodes, too few disk clusters. */
 169        if (megs_per_slot < la_mb)
 170                la_mb = megs_per_slot;
 171
 172        /* We can't store more bits than we can in a block. */
 173        la_max_mb = ocfs2_clusters_to_megabytes(osb->sb,
 174                                                ocfs2_local_alloc_size(sb) * 8);
 175        if (la_mb > la_max_mb)
 176                la_mb = la_max_mb;
 177
 178        return la_mb;
 179}
 180
 181void ocfs2_la_set_sizes(struct ocfs2_super *osb, int requested_mb)
 182{
 183        struct super_block *sb = osb->sb;
 184        unsigned int la_default_mb = ocfs2_la_default_mb(osb);
 185        unsigned int la_max_mb;
 186
 187        la_max_mb = ocfs2_clusters_to_megabytes(sb,
 188                                                ocfs2_local_alloc_size(sb) * 8);
 189
 190        trace_ocfs2_la_set_sizes(requested_mb, la_max_mb, la_default_mb);
 191
 192        if (requested_mb == -1) {
 193                /* No user request - use defaults */
 194                osb->local_alloc_default_bits =
 195                        ocfs2_megabytes_to_clusters(sb, la_default_mb);
 196        } else if (requested_mb > la_max_mb) {
 197                /* Request is too big, we give the maximum available */
 198                osb->local_alloc_default_bits =
 199                        ocfs2_megabytes_to_clusters(sb, la_max_mb);
 200        } else {
 201                osb->local_alloc_default_bits =
 202                        ocfs2_megabytes_to_clusters(sb, requested_mb);
 203        }
 204
 205        osb->local_alloc_bits = osb->local_alloc_default_bits;
 206}
 207
 208static inline int ocfs2_la_state_enabled(struct ocfs2_super *osb)
 209{
 210        return (osb->local_alloc_state == OCFS2_LA_THROTTLED ||
 211                osb->local_alloc_state == OCFS2_LA_ENABLED);
 212}
 213
 214void ocfs2_local_alloc_seen_free_bits(struct ocfs2_super *osb,
 215                                      unsigned int num_clusters)
 216{
 217        spin_lock(&osb->osb_lock);
 218        if (osb->local_alloc_state == OCFS2_LA_DISABLED ||
 219            osb->local_alloc_state == OCFS2_LA_THROTTLED)
 220                if (num_clusters >= osb->local_alloc_default_bits) {
 221                        cancel_delayed_work(&osb->la_enable_wq);
 222                        osb->local_alloc_state = OCFS2_LA_ENABLED;
 223                }
 224        spin_unlock(&osb->osb_lock);
 225}
 226
 227void ocfs2_la_enable_worker(struct work_struct *work)
 228{
 229        struct ocfs2_super *osb =
 230                container_of(work, struct ocfs2_super,
 231                             la_enable_wq.work);
 232        spin_lock(&osb->osb_lock);
 233        osb->local_alloc_state = OCFS2_LA_ENABLED;
 234        spin_unlock(&osb->osb_lock);
 235}
 236
 237/*
 238 * Tell us whether a given allocation should use the local alloc
 239 * file. Otherwise, it has to go to the main bitmap.
 240 *
 241 * This function does semi-dirty reads of local alloc size and state!
 242 * This is ok however, as the values are re-checked once under mutex.
 243 */
 244int ocfs2_alloc_should_use_local(struct ocfs2_super *osb, u64 bits)
 245{
 246        int ret = 0;
 247        int la_bits;
 248
 249        spin_lock(&osb->osb_lock);
 250        la_bits = osb->local_alloc_bits;
 251
 252        if (!ocfs2_la_state_enabled(osb))
 253                goto bail;
 254
 255        /* la_bits should be at least twice the size (in clusters) of
 256         * a new block group. We want to be sure block group
 257         * allocations go through the local alloc, so allow an
 258         * allocation to take up to half the bitmap. */
 259        if (bits > (la_bits / 2))
 260                goto bail;
 261
 262        ret = 1;
 263bail:
 264        trace_ocfs2_alloc_should_use_local(
 265             (unsigned long long)bits, osb->local_alloc_state, la_bits, ret);
 266        spin_unlock(&osb->osb_lock);
 267        return ret;
 268}
 269
 270int ocfs2_load_local_alloc(struct ocfs2_super *osb)
 271{
 272        int status = 0;
 273        struct ocfs2_dinode *alloc = NULL;
 274        struct buffer_head *alloc_bh = NULL;
 275        u32 num_used;
 276        struct inode *inode = NULL;
 277        struct ocfs2_local_alloc *la;
 278
 279        if (osb->local_alloc_bits == 0)
 280                goto bail;
 281
 282        if (osb->local_alloc_bits >= osb->bitmap_cpg) {
 283                mlog(ML_NOTICE, "Requested local alloc window %d is larger "
 284                     "than max possible %u. Using defaults.\n",
 285                     osb->local_alloc_bits, (osb->bitmap_cpg - 1));
 286                osb->local_alloc_bits =
 287                        ocfs2_megabytes_to_clusters(osb->sb,
 288                                                    ocfs2_la_default_mb(osb));
 289        }
 290
 291        /* read the alloc off disk */
 292        inode = ocfs2_get_system_file_inode(osb, LOCAL_ALLOC_SYSTEM_INODE,
 293                                            osb->slot_num);
 294        if (!inode) {
 295                status = -EINVAL;
 296                mlog_errno(status);
 297                goto bail;
 298        }
 299
 300        status = ocfs2_read_inode_block_full(inode, &alloc_bh,
 301                                             OCFS2_BH_IGNORE_CACHE);
 302        if (status < 0) {
 303                mlog_errno(status);
 304                goto bail;
 305        }
 306
 307        alloc = (struct ocfs2_dinode *) alloc_bh->b_data;
 308        la = OCFS2_LOCAL_ALLOC(alloc);
 309
 310        if (!(le32_to_cpu(alloc->i_flags) &
 311            (OCFS2_LOCAL_ALLOC_FL|OCFS2_BITMAP_FL))) {
 312                mlog(ML_ERROR, "Invalid local alloc inode, %llu\n",
 313                     (unsigned long long)OCFS2_I(inode)->ip_blkno);
 314                status = -EINVAL;
 315                goto bail;
 316        }
 317
 318        if ((la->la_size == 0) ||
 319            (le16_to_cpu(la->la_size) > ocfs2_local_alloc_size(inode->i_sb))) {
 320                mlog(ML_ERROR, "Local alloc size is invalid (la_size = %u)\n",
 321                     le16_to_cpu(la->la_size));
 322                status = -EINVAL;
 323                goto bail;
 324        }
 325
 326        /* do a little verification. */
 327        num_used = ocfs2_local_alloc_count_bits(alloc);
 328
 329        /* hopefully the local alloc has always been recovered before
 330         * we load it. */
 331        if (num_used
 332            || alloc->id1.bitmap1.i_used
 333            || alloc->id1.bitmap1.i_total
 334            || la->la_bm_off) {
 335                mlog(ML_ERROR, "inconsistent detected, clean journal with"
 336                     " unrecovered local alloc, please run fsck.ocfs2!\n"
 337                     "found = %u, set = %u, taken = %u, off = %u\n",
 338                     num_used, le32_to_cpu(alloc->id1.bitmap1.i_used),
 339                     le32_to_cpu(alloc->id1.bitmap1.i_total),
 340                     OCFS2_LOCAL_ALLOC(alloc)->la_bm_off);
 341
 342                status = -EINVAL;
 343                goto bail;
 344        }
 345
 346        osb->local_alloc_bh = alloc_bh;
 347        osb->local_alloc_state = OCFS2_LA_ENABLED;
 348
 349bail:
 350        if (status < 0)
 351                brelse(alloc_bh);
 352        iput(inode);
 353
 354        trace_ocfs2_load_local_alloc(osb->local_alloc_bits);
 355
 356        if (status)
 357                mlog_errno(status);
 358        return status;
 359}
 360
 361/*
 362 * return any unused bits to the bitmap and write out a clean
 363 * local_alloc.
 364 *
 365 * local_alloc_bh is optional. If not passed, we will simply use the
 366 * one off osb. If you do pass it however, be warned that it *will* be
 367 * returned brelse'd and NULL'd out.*/
 368void ocfs2_shutdown_local_alloc(struct ocfs2_super *osb)
 369{
 370        int status;
 371        handle_t *handle;
 372        struct inode *local_alloc_inode = NULL;
 373        struct buffer_head *bh = NULL;
 374        struct buffer_head *main_bm_bh = NULL;
 375        struct inode *main_bm_inode = NULL;
 376        struct ocfs2_dinode *alloc_copy = NULL;
 377        struct ocfs2_dinode *alloc = NULL;
 378
 379        cancel_delayed_work(&osb->la_enable_wq);
 380        flush_workqueue(osb->ocfs2_wq);
 381
 382        if (osb->local_alloc_state == OCFS2_LA_UNUSED)
 383                goto out;
 384
 385        local_alloc_inode =
 386                ocfs2_get_system_file_inode(osb,
 387                                            LOCAL_ALLOC_SYSTEM_INODE,
 388                                            osb->slot_num);
 389        if (!local_alloc_inode) {
 390                status = -ENOENT;
 391                mlog_errno(status);
 392                goto out;
 393        }
 394
 395        osb->local_alloc_state = OCFS2_LA_DISABLED;
 396
 397        ocfs2_resmap_uninit(&osb->osb_la_resmap);
 398
 399        main_bm_inode = ocfs2_get_system_file_inode(osb,
 400                                                    GLOBAL_BITMAP_SYSTEM_INODE,
 401                                                    OCFS2_INVALID_SLOT);
 402        if (!main_bm_inode) {
 403                status = -EINVAL;
 404                mlog_errno(status);
 405                goto out;
 406        }
 407
 408        inode_lock(main_bm_inode);
 409
 410        status = ocfs2_inode_lock(main_bm_inode, &main_bm_bh, 1);
 411        if (status < 0) {
 412                mlog_errno(status);
 413                goto out_mutex;
 414        }
 415
 416        /* WINDOW_MOVE_CREDITS is a bit heavy... */
 417        handle = ocfs2_start_trans(osb, OCFS2_WINDOW_MOVE_CREDITS);
 418        if (IS_ERR(handle)) {
 419                mlog_errno(PTR_ERR(handle));
 420                handle = NULL;
 421                goto out_unlock;
 422        }
 423
 424        bh = osb->local_alloc_bh;
 425        alloc = (struct ocfs2_dinode *) bh->b_data;
 426
 427        alloc_copy = kmalloc(bh->b_size, GFP_NOFS);
 428        if (!alloc_copy) {
 429                status = -ENOMEM;
 430                goto out_commit;
 431        }
 432        memcpy(alloc_copy, alloc, bh->b_size);
 433
 434        status = ocfs2_journal_access_di(handle, INODE_CACHE(local_alloc_inode),
 435                                         bh, OCFS2_JOURNAL_ACCESS_WRITE);
 436        if (status < 0) {
 437                mlog_errno(status);
 438                goto out_commit;
 439        }
 440
 441        ocfs2_clear_local_alloc(alloc);
 442        ocfs2_journal_dirty(handle, bh);
 443
 444        brelse(bh);
 445        osb->local_alloc_bh = NULL;
 446        osb->local_alloc_state = OCFS2_LA_UNUSED;
 447
 448        status = ocfs2_sync_local_to_main(osb, handle, alloc_copy,
 449                                          main_bm_inode, main_bm_bh);
 450        if (status < 0)
 451                mlog_errno(status);
 452
 453out_commit:
 454        ocfs2_commit_trans(osb, handle);
 455
 456out_unlock:
 457        brelse(main_bm_bh);
 458
 459        ocfs2_inode_unlock(main_bm_inode, 1);
 460
 461out_mutex:
 462        inode_unlock(main_bm_inode);
 463        iput(main_bm_inode);
 464
 465out:
 466        iput(local_alloc_inode);
 467
 468        kfree(alloc_copy);
 469}
 470
 471/*
 472 * We want to free the bitmap bits outside of any recovery context as
 473 * we'll need a cluster lock to do so, but we must clear the local
 474 * alloc before giving up the recovered nodes journal. To solve this,
 475 * we kmalloc a copy of the local alloc before it's change for the
 476 * caller to process with ocfs2_complete_local_alloc_recovery
 477 */
 478int ocfs2_begin_local_alloc_recovery(struct ocfs2_super *osb,
 479                                     int slot_num,
 480                                     struct ocfs2_dinode **alloc_copy)
 481{
 482        int status = 0;
 483        struct buffer_head *alloc_bh = NULL;
 484        struct inode *inode = NULL;
 485        struct ocfs2_dinode *alloc;
 486
 487        trace_ocfs2_begin_local_alloc_recovery(slot_num);
 488
 489        *alloc_copy = NULL;
 490
 491        inode = ocfs2_get_system_file_inode(osb,
 492                                            LOCAL_ALLOC_SYSTEM_INODE,
 493                                            slot_num);
 494        if (!inode) {
 495                status = -EINVAL;
 496                mlog_errno(status);
 497                goto bail;
 498        }
 499
 500        inode_lock(inode);
 501
 502        status = ocfs2_read_inode_block_full(inode, &alloc_bh,
 503                                             OCFS2_BH_IGNORE_CACHE);
 504        if (status < 0) {
 505                mlog_errno(status);
 506                goto bail;
 507        }
 508
 509        *alloc_copy = kmalloc(alloc_bh->b_size, GFP_KERNEL);
 510        if (!(*alloc_copy)) {
 511                status = -ENOMEM;
 512                goto bail;
 513        }
 514        memcpy((*alloc_copy), alloc_bh->b_data, alloc_bh->b_size);
 515
 516        alloc = (struct ocfs2_dinode *) alloc_bh->b_data;
 517        ocfs2_clear_local_alloc(alloc);
 518
 519        ocfs2_compute_meta_ecc(osb->sb, alloc_bh->b_data, &alloc->i_check);
 520        status = ocfs2_write_block(osb, alloc_bh, INODE_CACHE(inode));
 521        if (status < 0)
 522                mlog_errno(status);
 523
 524bail:
 525        if (status < 0) {
 526                kfree(*alloc_copy);
 527                *alloc_copy = NULL;
 528        }
 529
 530        brelse(alloc_bh);
 531
 532        if (inode) {
 533                inode_unlock(inode);
 534                iput(inode);
 535        }
 536
 537        if (status)
 538                mlog_errno(status);
 539        return status;
 540}
 541
 542/*
 543 * Step 2: By now, we've completed the journal recovery, we've stamped
 544 * a clean local alloc on disk and dropped the node out of the
 545 * recovery map. Dlm locks will no longer stall, so lets clear out the
 546 * main bitmap.
 547 */
 548int ocfs2_complete_local_alloc_recovery(struct ocfs2_super *osb,
 549                                        struct ocfs2_dinode *alloc)
 550{
 551        int status;
 552        handle_t *handle;
 553        struct buffer_head *main_bm_bh = NULL;
 554        struct inode *main_bm_inode;
 555
 556        main_bm_inode = ocfs2_get_system_file_inode(osb,
 557                                                    GLOBAL_BITMAP_SYSTEM_INODE,
 558                                                    OCFS2_INVALID_SLOT);
 559        if (!main_bm_inode) {
 560                status = -EINVAL;
 561                mlog_errno(status);
 562                goto out;
 563        }
 564
 565        inode_lock(main_bm_inode);
 566
 567        status = ocfs2_inode_lock(main_bm_inode, &main_bm_bh, 1);
 568        if (status < 0) {
 569                mlog_errno(status);
 570                goto out_mutex;
 571        }
 572
 573        handle = ocfs2_start_trans(osb, OCFS2_WINDOW_MOVE_CREDITS);
 574        if (IS_ERR(handle)) {
 575                status = PTR_ERR(handle);
 576                handle = NULL;
 577                mlog_errno(status);
 578                goto out_unlock;
 579        }
 580
 581        /* we want the bitmap change to be recorded on disk asap */
 582        handle->h_sync = 1;
 583
 584        status = ocfs2_sync_local_to_main(osb, handle, alloc,
 585                                          main_bm_inode, main_bm_bh);
 586        if (status < 0)
 587                mlog_errno(status);
 588
 589        ocfs2_commit_trans(osb, handle);
 590
 591out_unlock:
 592        ocfs2_inode_unlock(main_bm_inode, 1);
 593
 594out_mutex:
 595        inode_unlock(main_bm_inode);
 596
 597        brelse(main_bm_bh);
 598
 599        iput(main_bm_inode);
 600
 601out:
 602        if (!status)
 603                ocfs2_init_steal_slots(osb);
 604        if (status)
 605                mlog_errno(status);
 606        return status;
 607}
 608
 609/*
 610 * make sure we've got at least bits_wanted contiguous bits in the
 611 * local alloc. You lose them when you drop i_mutex.
 612 *
 613 * We will add ourselves to the transaction passed in, but may start
 614 * our own in order to shift windows.
 615 */
 616int ocfs2_reserve_local_alloc_bits(struct ocfs2_super *osb,
 617                                   u32 bits_wanted,
 618                                   struct ocfs2_alloc_context *ac)
 619{
 620        int status;
 621        struct ocfs2_dinode *alloc;
 622        struct inode *local_alloc_inode;
 623        unsigned int free_bits;
 624
 625        BUG_ON(!ac);
 626
 627        local_alloc_inode =
 628                ocfs2_get_system_file_inode(osb,
 629                                            LOCAL_ALLOC_SYSTEM_INODE,
 630                                            osb->slot_num);
 631        if (!local_alloc_inode) {
 632                status = -ENOENT;
 633                mlog_errno(status);
 634                goto bail;
 635        }
 636
 637        inode_lock(local_alloc_inode);
 638
 639        /*
 640         * We must double check state and allocator bits because
 641         * another process may have changed them while holding i_mutex.
 642         */
 643        spin_lock(&osb->osb_lock);
 644        if (!ocfs2_la_state_enabled(osb) ||
 645            (bits_wanted > osb->local_alloc_bits)) {
 646                spin_unlock(&osb->osb_lock);
 647                status = -ENOSPC;
 648                goto bail;
 649        }
 650        spin_unlock(&osb->osb_lock);
 651
 652        alloc = (struct ocfs2_dinode *) osb->local_alloc_bh->b_data;
 653
 654#ifdef CONFIG_OCFS2_DEBUG_FS
 655        if (le32_to_cpu(alloc->id1.bitmap1.i_used) !=
 656            ocfs2_local_alloc_count_bits(alloc)) {
 657                status = ocfs2_error(osb->sb, "local alloc inode %llu says it has %u used bits, but a count shows %u\n",
 658                                (unsigned long long)le64_to_cpu(alloc->i_blkno),
 659                                le32_to_cpu(alloc->id1.bitmap1.i_used),
 660                                ocfs2_local_alloc_count_bits(alloc));
 661                goto bail;
 662        }
 663#endif
 664
 665        free_bits = le32_to_cpu(alloc->id1.bitmap1.i_total) -
 666                le32_to_cpu(alloc->id1.bitmap1.i_used);
 667        if (bits_wanted > free_bits) {
 668                /* uhoh, window change time. */
 669                status =
 670                        ocfs2_local_alloc_slide_window(osb, local_alloc_inode);
 671                if (status < 0) {
 672                        if (status != -ENOSPC)
 673                                mlog_errno(status);
 674                        goto bail;
 675                }
 676
 677                /*
 678                 * Under certain conditions, the window slide code
 679                 * might have reduced the number of bits available or
 680                 * disabled the the local alloc entirely. Re-check
 681                 * here and return -ENOSPC if necessary.
 682                 */
 683                status = -ENOSPC;
 684                if (!ocfs2_la_state_enabled(osb))
 685                        goto bail;
 686
 687                free_bits = le32_to_cpu(alloc->id1.bitmap1.i_total) -
 688                        le32_to_cpu(alloc->id1.bitmap1.i_used);
 689                if (bits_wanted > free_bits)
 690                        goto bail;
 691        }
 692
 693        ac->ac_inode = local_alloc_inode;
 694        /* We should never use localalloc from another slot */
 695        ac->ac_alloc_slot = osb->slot_num;
 696        ac->ac_which = OCFS2_AC_USE_LOCAL;
 697        get_bh(osb->local_alloc_bh);
 698        ac->ac_bh = osb->local_alloc_bh;
 699        status = 0;
 700bail:
 701        if (status < 0 && local_alloc_inode) {
 702                inode_unlock(local_alloc_inode);
 703                iput(local_alloc_inode);
 704        }
 705
 706        trace_ocfs2_reserve_local_alloc_bits(
 707                (unsigned long long)ac->ac_max_block,
 708                bits_wanted, osb->slot_num, status);
 709
 710        if (status)
 711                mlog_errno(status);
 712        return status;
 713}
 714
 715int ocfs2_claim_local_alloc_bits(struct ocfs2_super *osb,
 716                                 handle_t *handle,
 717                                 struct ocfs2_alloc_context *ac,
 718                                 u32 bits_wanted,
 719                                 u32 *bit_off,
 720                                 u32 *num_bits)
 721{
 722        int status, start;
 723        struct inode *local_alloc_inode;
 724        void *bitmap;
 725        struct ocfs2_dinode *alloc;
 726        struct ocfs2_local_alloc *la;
 727
 728        BUG_ON(ac->ac_which != OCFS2_AC_USE_LOCAL);
 729
 730        local_alloc_inode = ac->ac_inode;
 731        alloc = (struct ocfs2_dinode *) osb->local_alloc_bh->b_data;
 732        la = OCFS2_LOCAL_ALLOC(alloc);
 733
 734        start = ocfs2_local_alloc_find_clear_bits(osb, alloc, &bits_wanted,
 735                                                  ac->ac_resv);
 736        if (start == -1) {
 737                /* TODO: Shouldn't we just BUG here? */
 738                status = -ENOSPC;
 739                mlog_errno(status);
 740                goto bail;
 741        }
 742
 743        bitmap = la->la_bitmap;
 744        *bit_off = le32_to_cpu(la->la_bm_off) + start;
 745        *num_bits = bits_wanted;
 746
 747        status = ocfs2_journal_access_di(handle,
 748                                         INODE_CACHE(local_alloc_inode),
 749                                         osb->local_alloc_bh,
 750                                         OCFS2_JOURNAL_ACCESS_WRITE);
 751        if (status < 0) {
 752                mlog_errno(status);
 753                goto bail;
 754        }
 755
 756        ocfs2_resmap_claimed_bits(&osb->osb_la_resmap, ac->ac_resv, start,
 757                                  bits_wanted);
 758
 759        while(bits_wanted--)
 760                ocfs2_set_bit(start++, bitmap);
 761
 762        le32_add_cpu(&alloc->id1.bitmap1.i_used, *num_bits);
 763        ocfs2_journal_dirty(handle, osb->local_alloc_bh);
 764
 765bail:
 766        if (status)
 767                mlog_errno(status);
 768        return status;
 769}
 770
 771int ocfs2_free_local_alloc_bits(struct ocfs2_super *osb,
 772                                handle_t *handle,
 773                                struct ocfs2_alloc_context *ac,
 774                                u32 bit_off,
 775                                u32 num_bits)
 776{
 777        int status, start;
 778        u32 clear_bits;
 779        struct inode *local_alloc_inode;
 780        void *bitmap;
 781        struct ocfs2_dinode *alloc;
 782        struct ocfs2_local_alloc *la;
 783
 784        BUG_ON(ac->ac_which != OCFS2_AC_USE_LOCAL);
 785
 786        local_alloc_inode = ac->ac_inode;
 787        alloc = (struct ocfs2_dinode *) osb->local_alloc_bh->b_data;
 788        la = OCFS2_LOCAL_ALLOC(alloc);
 789
 790        bitmap = la->la_bitmap;
 791        start = bit_off - le32_to_cpu(la->la_bm_off);
 792        clear_bits = num_bits;
 793
 794        status = ocfs2_journal_access_di(handle,
 795                        INODE_CACHE(local_alloc_inode),
 796                        osb->local_alloc_bh,
 797                        OCFS2_JOURNAL_ACCESS_WRITE);
 798        if (status < 0) {
 799                mlog_errno(status);
 800                goto bail;
 801        }
 802
 803        while (clear_bits--)
 804                ocfs2_clear_bit(start++, bitmap);
 805
 806        le32_add_cpu(&alloc->id1.bitmap1.i_used, -num_bits);
 807        ocfs2_journal_dirty(handle, osb->local_alloc_bh);
 808
 809bail:
 810        return status;
 811}
 812
 813static u32 ocfs2_local_alloc_count_bits(struct ocfs2_dinode *alloc)
 814{
 815        u32 count;
 816        struct ocfs2_local_alloc *la = OCFS2_LOCAL_ALLOC(alloc);
 817
 818        count = memweight(la->la_bitmap, le16_to_cpu(la->la_size));
 819
 820        trace_ocfs2_local_alloc_count_bits(count);
 821        return count;
 822}
 823
 824static int ocfs2_local_alloc_find_clear_bits(struct ocfs2_super *osb,
 825                                     struct ocfs2_dinode *alloc,
 826                                     u32 *numbits,
 827                                     struct ocfs2_alloc_reservation *resv)
 828{
 829        int numfound = 0, bitoff, left, startoff;
 830        int local_resv = 0;
 831        struct ocfs2_alloc_reservation r;
 832        void *bitmap = NULL;
 833        struct ocfs2_reservation_map *resmap = &osb->osb_la_resmap;
 834
 835        if (!alloc->id1.bitmap1.i_total) {
 836                bitoff = -1;
 837                goto bail;
 838        }
 839
 840        if (!resv) {
 841                local_resv = 1;
 842                ocfs2_resv_init_once(&r);
 843                ocfs2_resv_set_type(&r, OCFS2_RESV_FLAG_TMP);
 844                resv = &r;
 845        }
 846
 847        numfound = *numbits;
 848        if (ocfs2_resmap_resv_bits(resmap, resv, &bitoff, &numfound) == 0) {
 849                if (numfound < *numbits)
 850                        *numbits = numfound;
 851                goto bail;
 852        }
 853
 854        /*
 855         * Code error. While reservations are enabled, local
 856         * allocation should _always_ go through them.
 857         */
 858        BUG_ON(osb->osb_resv_level != 0);
 859
 860        /*
 861         * Reservations are disabled. Handle this the old way.
 862         */
 863
 864        bitmap = OCFS2_LOCAL_ALLOC(alloc)->la_bitmap;
 865
 866        numfound = bitoff = startoff = 0;
 867        left = le32_to_cpu(alloc->id1.bitmap1.i_total);
 868        while ((bitoff = ocfs2_find_next_zero_bit(bitmap, left, startoff)) != -1) {
 869                if (bitoff == left) {
 870                        /* mlog(0, "bitoff (%d) == left", bitoff); */
 871                        break;
 872                }
 873                /* mlog(0, "Found a zero: bitoff = %d, startoff = %d, "
 874                   "numfound = %d\n", bitoff, startoff, numfound);*/
 875
 876                /* Ok, we found a zero bit... is it contig. or do we
 877                 * start over?*/
 878                if (bitoff == startoff) {
 879                        /* we found a zero */
 880                        numfound++;
 881                        startoff++;
 882                } else {
 883                        /* got a zero after some ones */
 884                        numfound = 1;
 885                        startoff = bitoff+1;
 886                }
 887                /* we got everything we needed */
 888                if (numfound == *numbits) {
 889                        /* mlog(0, "Found it all!\n"); */
 890                        break;
 891                }
 892        }
 893
 894        trace_ocfs2_local_alloc_find_clear_bits_search_bitmap(bitoff, numfound);
 895
 896        if (numfound == *numbits)
 897                bitoff = startoff - numfound;
 898        else
 899                bitoff = -1;
 900
 901bail:
 902        if (local_resv)
 903                ocfs2_resv_discard(resmap, resv);
 904
 905        trace_ocfs2_local_alloc_find_clear_bits(*numbits,
 906                le32_to_cpu(alloc->id1.bitmap1.i_total),
 907                bitoff, numfound);
 908
 909        return bitoff;
 910}
 911
 912static void ocfs2_clear_local_alloc(struct ocfs2_dinode *alloc)
 913{
 914        struct ocfs2_local_alloc *la = OCFS2_LOCAL_ALLOC(alloc);
 915        int i;
 916
 917        alloc->id1.bitmap1.i_total = 0;
 918        alloc->id1.bitmap1.i_used = 0;
 919        la->la_bm_off = 0;
 920        for(i = 0; i < le16_to_cpu(la->la_size); i++)
 921                la->la_bitmap[i] = 0;
 922}
 923
 924#if 0
 925/* turn this on and uncomment below to aid debugging window shifts. */
 926static void ocfs2_verify_zero_bits(unsigned long *bitmap,
 927                                   unsigned int start,
 928                                   unsigned int count)
 929{
 930        unsigned int tmp = count;
 931        while(tmp--) {
 932                if (ocfs2_test_bit(start + tmp, bitmap)) {
 933                        printk("ocfs2_verify_zero_bits: start = %u, count = "
 934                               "%u\n", start, count);
 935                        printk("ocfs2_verify_zero_bits: bit %u is set!",
 936                               start + tmp);
 937                        BUG();
 938                }
 939        }
 940}
 941#endif
 942
 943/*
 944 * sync the local alloc to main bitmap.
 945 *
 946 * assumes you've already locked the main bitmap -- the bitmap inode
 947 * passed is used for caching.
 948 */
 949static int ocfs2_sync_local_to_main(struct ocfs2_super *osb,
 950                                    handle_t *handle,
 951                                    struct ocfs2_dinode *alloc,
 952                                    struct inode *main_bm_inode,
 953                                    struct buffer_head *main_bm_bh)
 954{
 955        int status = 0;
 956        int bit_off, left, count, start;
 957        u64 la_start_blk;
 958        u64 blkno;
 959        void *bitmap;
 960        struct ocfs2_local_alloc *la = OCFS2_LOCAL_ALLOC(alloc);
 961
 962        trace_ocfs2_sync_local_to_main(
 963             le32_to_cpu(alloc->id1.bitmap1.i_total),
 964             le32_to_cpu(alloc->id1.bitmap1.i_used));
 965
 966        if (!alloc->id1.bitmap1.i_total) {
 967                goto bail;
 968        }
 969
 970        if (le32_to_cpu(alloc->id1.bitmap1.i_used) ==
 971            le32_to_cpu(alloc->id1.bitmap1.i_total)) {
 972                goto bail;
 973        }
 974
 975        la_start_blk = ocfs2_clusters_to_blocks(osb->sb,
 976                                                le32_to_cpu(la->la_bm_off));
 977        bitmap = la->la_bitmap;
 978        start = count = bit_off = 0;
 979        left = le32_to_cpu(alloc->id1.bitmap1.i_total);
 980
 981        while ((bit_off = ocfs2_find_next_zero_bit(bitmap, left, start))
 982               != -1) {
 983                if ((bit_off < left) && (bit_off == start)) {
 984                        count++;
 985                        start++;
 986                        continue;
 987                }
 988                if (count) {
 989                        blkno = la_start_blk +
 990                                ocfs2_clusters_to_blocks(osb->sb,
 991                                                         start - count);
 992
 993                        trace_ocfs2_sync_local_to_main_free(
 994                             count, start - count,
 995                             (unsigned long long)la_start_blk,
 996                             (unsigned long long)blkno);
 997
 998                        status = ocfs2_release_clusters(handle,
 999                                                        main_bm_inode,
1000                                                        main_bm_bh, blkno,
1001                                                        count);
1002                        if (status < 0) {
1003                                mlog_errno(status);
1004                                goto bail;
1005                        }
1006                }
1007                if (bit_off >= left)
1008                        break;
1009                count = 1;
1010                start = bit_off + 1;
1011        }
1012
1013bail:
1014        if (status)
1015                mlog_errno(status);
1016        return status;
1017}
1018
1019enum ocfs2_la_event {
1020        OCFS2_LA_EVENT_SLIDE,           /* Normal window slide. */
1021        OCFS2_LA_EVENT_FRAGMENTED,      /* The global bitmap has
1022                                         * enough bits theoretically
1023                                         * free, but a contiguous
1024                                         * allocation could not be
1025                                         * found. */
1026        OCFS2_LA_EVENT_ENOSPC,          /* Global bitmap doesn't have
1027                                         * enough bits free to satisfy
1028                                         * our request. */
1029};
1030#define OCFS2_LA_ENABLE_INTERVAL (30 * HZ)
1031/*
1032 * Given an event, calculate the size of our next local alloc window.
1033 *
1034 * This should always be called under i_mutex of the local alloc inode
1035 * so that local alloc disabling doesn't race with processes trying to
1036 * use the allocator.
1037 *
1038 * Returns the state which the local alloc was left in. This value can
1039 * be ignored by some paths.
1040 */
1041static int ocfs2_recalc_la_window(struct ocfs2_super *osb,
1042                                  enum ocfs2_la_event event)
1043{
1044        unsigned int bits;
1045        int state;
1046
1047        spin_lock(&osb->osb_lock);
1048        if (osb->local_alloc_state == OCFS2_LA_DISABLED) {
1049                WARN_ON_ONCE(osb->local_alloc_state == OCFS2_LA_DISABLED);
1050                goto out_unlock;
1051        }
1052
1053        /*
1054         * ENOSPC and fragmentation are treated similarly for now.
1055         */
1056        if (event == OCFS2_LA_EVENT_ENOSPC ||
1057            event == OCFS2_LA_EVENT_FRAGMENTED) {
1058                /*
1059                 * We ran out of contiguous space in the primary
1060                 * bitmap. Drastically reduce the number of bits used
1061                 * by local alloc until we have to disable it.
1062                 */
1063                bits = osb->local_alloc_bits >> 1;
1064                if (bits > ocfs2_megabytes_to_clusters(osb->sb, 1)) {
1065                        /*
1066                         * By setting state to THROTTLED, we'll keep
1067                         * the number of local alloc bits used down
1068                         * until an event occurs which would give us
1069                         * reason to assume the bitmap situation might
1070                         * have changed.
1071                         */
1072                        osb->local_alloc_state = OCFS2_LA_THROTTLED;
1073                        osb->local_alloc_bits = bits;
1074                } else {
1075                        osb->local_alloc_state = OCFS2_LA_DISABLED;
1076                }
1077                queue_delayed_work(osb->ocfs2_wq, &osb->la_enable_wq,
1078                                   OCFS2_LA_ENABLE_INTERVAL);
1079                goto out_unlock;
1080        }
1081
1082        /*
1083         * Don't increase the size of the local alloc window until we
1084         * know we might be able to fulfill the request. Otherwise, we
1085         * risk bouncing around the global bitmap during periods of
1086         * low space.
1087         */
1088        if (osb->local_alloc_state != OCFS2_LA_THROTTLED)
1089                osb->local_alloc_bits = osb->local_alloc_default_bits;
1090
1091out_unlock:
1092        state = osb->local_alloc_state;
1093        spin_unlock(&osb->osb_lock);
1094
1095        return state;
1096}
1097
1098static int ocfs2_local_alloc_reserve_for_window(struct ocfs2_super *osb,
1099                                                struct ocfs2_alloc_context **ac,
1100                                                struct inode **bitmap_inode,
1101                                                struct buffer_head **bitmap_bh)
1102{
1103        int status;
1104
1105        *ac = kzalloc(sizeof(struct ocfs2_alloc_context), GFP_KERNEL);
1106        if (!(*ac)) {
1107                status = -ENOMEM;
1108                mlog_errno(status);
1109                goto bail;
1110        }
1111
1112retry_enospc:
1113        (*ac)->ac_bits_wanted = osb->local_alloc_bits;
1114        status = ocfs2_reserve_cluster_bitmap_bits(osb, *ac);
1115        if (status == -ENOSPC) {
1116                if (ocfs2_recalc_la_window(osb, OCFS2_LA_EVENT_ENOSPC) ==
1117                    OCFS2_LA_DISABLED)
1118                        goto bail;
1119
1120                ocfs2_free_ac_resource(*ac);
1121                memset(*ac, 0, sizeof(struct ocfs2_alloc_context));
1122                goto retry_enospc;
1123        }
1124        if (status < 0) {
1125                mlog_errno(status);
1126                goto bail;
1127        }
1128
1129        *bitmap_inode = (*ac)->ac_inode;
1130        igrab(*bitmap_inode);
1131        *bitmap_bh = (*ac)->ac_bh;
1132        get_bh(*bitmap_bh);
1133        status = 0;
1134bail:
1135        if ((status < 0) && *ac) {
1136                ocfs2_free_alloc_context(*ac);
1137                *ac = NULL;
1138        }
1139
1140        if (status)
1141                mlog_errno(status);
1142        return status;
1143}
1144
1145/*
1146 * pass it the bitmap lock in lock_bh if you have it.
1147 */
1148static int ocfs2_local_alloc_new_window(struct ocfs2_super *osb,
1149                                        handle_t *handle,
1150                                        struct ocfs2_alloc_context *ac)
1151{
1152        int status = 0;
1153        u32 cluster_off, cluster_count;
1154        struct ocfs2_dinode *alloc = NULL;
1155        struct ocfs2_local_alloc *la;
1156
1157        alloc = (struct ocfs2_dinode *) osb->local_alloc_bh->b_data;
1158        la = OCFS2_LOCAL_ALLOC(alloc);
1159
1160        trace_ocfs2_local_alloc_new_window(
1161                le32_to_cpu(alloc->id1.bitmap1.i_total),
1162                osb->local_alloc_bits);
1163
1164        /* Instruct the allocation code to try the most recently used
1165         * cluster group. We'll re-record the group used this pass
1166         * below. */
1167        ac->ac_last_group = osb->la_last_gd;
1168
1169        /* we used the generic suballoc reserve function, but we set
1170         * everything up nicely, so there's no reason why we can't use
1171         * the more specific cluster api to claim bits. */
1172        status = ocfs2_claim_clusters(handle, ac, osb->local_alloc_bits,
1173                                      &cluster_off, &cluster_count);
1174        if (status == -ENOSPC) {
1175retry_enospc:
1176                /*
1177                 * Note: We could also try syncing the journal here to
1178                 * allow use of any free bits which the current
1179                 * transaction can't give us access to. --Mark
1180                 */
1181                if (ocfs2_recalc_la_window(osb, OCFS2_LA_EVENT_FRAGMENTED) ==
1182                    OCFS2_LA_DISABLED)
1183                        goto bail;
1184
1185                ac->ac_bits_wanted = osb->local_alloc_bits;
1186                status = ocfs2_claim_clusters(handle, ac,
1187                                              osb->local_alloc_bits,
1188                                              &cluster_off,
1189                                              &cluster_count);
1190                if (status == -ENOSPC)
1191                        goto retry_enospc;
1192                /*
1193                 * We only shrunk the *minimum* number of in our
1194                 * request - it's entirely possible that the allocator
1195                 * might give us more than we asked for.
1196                 */
1197                if (status == 0) {
1198                        spin_lock(&osb->osb_lock);
1199                        osb->local_alloc_bits = cluster_count;
1200                        spin_unlock(&osb->osb_lock);
1201                }
1202        }
1203        if (status < 0) {
1204                if (status != -ENOSPC)
1205                        mlog_errno(status);
1206                goto bail;
1207        }
1208
1209        osb->la_last_gd = ac->ac_last_group;
1210
1211        la->la_bm_off = cpu_to_le32(cluster_off);
1212        alloc->id1.bitmap1.i_total = cpu_to_le32(cluster_count);
1213        /* just in case... In the future when we find space ourselves,
1214         * we don't have to get all contiguous -- but we'll have to
1215         * set all previously used bits in bitmap and update
1216         * la_bits_set before setting the bits in the main bitmap. */
1217        alloc->id1.bitmap1.i_used = 0;
1218        memset(OCFS2_LOCAL_ALLOC(alloc)->la_bitmap, 0,
1219               le16_to_cpu(la->la_size));
1220
1221        ocfs2_resmap_restart(&osb->osb_la_resmap, cluster_count,
1222                             OCFS2_LOCAL_ALLOC(alloc)->la_bitmap);
1223
1224        trace_ocfs2_local_alloc_new_window_result(
1225                OCFS2_LOCAL_ALLOC(alloc)->la_bm_off,
1226                le32_to_cpu(alloc->id1.bitmap1.i_total));
1227
1228bail:
1229        if (status)
1230                mlog_errno(status);
1231        return status;
1232}
1233
1234/* Note that we do *NOT* lock the local alloc inode here as
1235 * it's been locked already for us. */
1236static int ocfs2_local_alloc_slide_window(struct ocfs2_super *osb,
1237                                          struct inode *local_alloc_inode)
1238{
1239        int status = 0;
1240        struct buffer_head *main_bm_bh = NULL;
1241        struct inode *main_bm_inode = NULL;
1242        handle_t *handle = NULL;
1243        struct ocfs2_dinode *alloc;
1244        struct ocfs2_dinode *alloc_copy = NULL;
1245        struct ocfs2_alloc_context *ac = NULL;
1246
1247        ocfs2_recalc_la_window(osb, OCFS2_LA_EVENT_SLIDE);
1248
1249        /* This will lock the main bitmap for us. */
1250        status = ocfs2_local_alloc_reserve_for_window(osb,
1251                                                      &ac,
1252                                                      &main_bm_inode,
1253                                                      &main_bm_bh);
1254        if (status < 0) {
1255                if (status != -ENOSPC)
1256                        mlog_errno(status);
1257                goto bail;
1258        }
1259
1260        handle = ocfs2_start_trans(osb, OCFS2_WINDOW_MOVE_CREDITS);
1261        if (IS_ERR(handle)) {
1262                status = PTR_ERR(handle);
1263                handle = NULL;
1264                mlog_errno(status);
1265                goto bail;
1266        }
1267
1268        alloc = (struct ocfs2_dinode *) osb->local_alloc_bh->b_data;
1269
1270        /* We want to clear the local alloc before doing anything
1271         * else, so that if we error later during this operation,
1272         * local alloc shutdown won't try to double free main bitmap
1273         * bits. Make a copy so the sync function knows which bits to
1274         * free. */
1275        alloc_copy = kmalloc(osb->local_alloc_bh->b_size, GFP_NOFS);
1276        if (!alloc_copy) {
1277                status = -ENOMEM;
1278                mlog_errno(status);
1279                goto bail;
1280        }
1281        memcpy(alloc_copy, alloc, osb->local_alloc_bh->b_size);
1282
1283        status = ocfs2_journal_access_di(handle,
1284                                         INODE_CACHE(local_alloc_inode),
1285                                         osb->local_alloc_bh,
1286                                         OCFS2_JOURNAL_ACCESS_WRITE);
1287        if (status < 0) {
1288                mlog_errno(status);
1289                goto bail;
1290        }
1291
1292        ocfs2_clear_local_alloc(alloc);
1293        ocfs2_journal_dirty(handle, osb->local_alloc_bh);
1294
1295        status = ocfs2_sync_local_to_main(osb, handle, alloc_copy,
1296                                          main_bm_inode, main_bm_bh);
1297        if (status < 0) {
1298                mlog_errno(status);
1299                goto bail;
1300        }
1301
1302        status = ocfs2_local_alloc_new_window(osb, handle, ac);
1303        if (status < 0) {
1304                if (status != -ENOSPC)
1305                        mlog_errno(status);
1306                goto bail;
1307        }
1308
1309        atomic_inc(&osb->alloc_stats.moves);
1310
1311bail:
1312        if (handle)
1313                ocfs2_commit_trans(osb, handle);
1314
1315        brelse(main_bm_bh);
1316
1317        iput(main_bm_inode);
1318        kfree(alloc_copy);
1319
1320        if (ac)
1321                ocfs2_free_alloc_context(ac);
1322
1323        if (status)
1324                mlog_errno(status);
1325        return status;
1326}
1327
1328