git.oblomov.eu Git - linux-2.6/blob - fs/ocfs2/resize.c

   1 /* -*- mode: c; c-basic-offset: 8; -*-
   2  * vim: noexpandtab sw=8 ts=8 sts=0:
   3  *
   4  * resize.c
   5  *
   6  * volume resize.
   7  * Inspired by ext3/resize.c.
   8  *
   9  * Copyright (C) 2007 Oracle.  All rights reserved.
  10  *
  11  * This program is free software; you can redistribute it and/or
  12  * modify it under the terms of the GNU General Public
  13  * License as published by the Free Software Foundation; either
  14  * version 2 of the License, or (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  19  * General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public
  22  * License along with this program; if not, write to the
  23  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  24  * Boston, MA 021110-1307, USA.
  25  */
  26
  27 #include <linux/fs.h>
  28 #include <linux/types.h>
  29
  30 #define MLOG_MASK_PREFIX ML_DISK_ALLOC
  31 #include <cluster/masklog.h>
  32
  33 #include "ocfs2.h"
  34
  35 #include "alloc.h"
  36 #include "dlmglue.h"
  37 #include "inode.h"
  38 #include "journal.h"
  39 #include "super.h"
  40 #include "sysfile.h"
  41 #include "uptodate.h"
  42
  43 #include "buffer_head_io.h"
  44 #include "suballoc.h"
  45 #include "resize.h"
  46
  47 /*
  48  * Check whether there are new backup superblocks exist
  49  * in the last group. If there are some, mark them or clear
  50  * them in the bitmap.
  51  *
  52  * Return how many backups we find in the last group.
  53  */
  54 static u16 ocfs2_calc_new_backup_super(struct inode *inode,
  55                                        struct ocfs2_group_desc *gd,
  56                                        int new_clusters,
  57                                        u32 first_new_cluster,
  58                                        u16 cl_cpg,
  59                                        int set)
  60 {
  61         int i;
  62         u16 backups = 0;
  63         u32 cluster;
  64         u64 blkno, gd_blkno, lgd_blkno = le64_to_cpu(gd->bg_blkno);
  65
  66         for (i = 0; i < OCFS2_MAX_BACKUP_SUPERBLOCKS; i++) {
  67                 blkno = ocfs2_backup_super_blkno(inode->i_sb, i);
  68                 cluster = ocfs2_blocks_to_clusters(inode->i_sb, blkno);
  69
  70                 gd_blkno = ocfs2_which_cluster_group(inode, cluster);
  71                 if (gd_blkno < lgd_blkno)
  72                         continue;
  73                 else if (gd_blkno > lgd_blkno)
  74                         break;
  75
  76                 if (set)
  77                         ocfs2_set_bit(cluster % cl_cpg,
  78                                       (unsigned long *)gd->bg_bitmap);
  79                 else
  80                         ocfs2_clear_bit(cluster % cl_cpg,
  81                                         (unsigned long *)gd->bg_bitmap);
  82                 backups++;
  83         }
  84
  85         mlog_exit_void();
  86         return backups;
  87 }
  88
  89 static int ocfs2_update_last_group_and_inode(handle_t *handle,
  90                                              struct inode *bm_inode,
  91                                              struct buffer_head *bm_bh,
  92                                              struct buffer_head *group_bh,
  93                                              u32 first_new_cluster,
  94                                              int new_clusters)
  95 {
  96         int ret = 0;
  97         struct ocfs2_super *osb = OCFS2_SB(bm_inode->i_sb);
  98         struct ocfs2_dinode *fe = (struct ocfs2_dinode *) bm_bh->b_data;
  99         struct ocfs2_chain_list *cl = &fe->id2.i_chain;
 100         struct ocfs2_chain_rec *cr;
 101         struct ocfs2_group_desc *group;
 102         u16 chain, num_bits, backups = 0;
 103         u16 cl_bpc = le16_to_cpu(cl->cl_bpc);
 104         u16 cl_cpg = le16_to_cpu(cl->cl_cpg);
 105
 106         mlog_entry("(new_clusters=%d, first_new_cluster = %u)\n",
 107                    new_clusters, first_new_cluster);
 108
 109         ret = ocfs2_journal_access_gd(handle, bm_inode, group_bh,
 110                                       OCFS2_JOURNAL_ACCESS_WRITE);
 111         if (ret < 0) {
 112                 mlog_errno(ret);
 113                 goto out;
 114         }
 115
 116         group = (struct ocfs2_group_desc *)group_bh->b_data;
 117
 118         /* update the group first. */
 119         num_bits = new_clusters * cl_bpc;
 120         le16_add_cpu(&group->bg_bits, num_bits);
 121         le16_add_cpu(&group->bg_free_bits_count, num_bits);
 122
 123         /*
 124          * check whether there are some new backup superblocks exist in
 125          * this group and update the group bitmap accordingly.
 126          */
 127         if (OCFS2_HAS_COMPAT_FEATURE(osb->sb,
 128                                      OCFS2_FEATURE_COMPAT_BACKUP_SB)) {
 129                 backups = ocfs2_calc_new_backup_super(bm_inode,
 130                                                      group,
 131                                                      new_clusters,
 132                                                      first_new_cluster,
 133                                                      cl_cpg, 1);
 134                 le16_add_cpu(&group->bg_free_bits_count, -1 * backups);
 135         }
 136
 137         ret = ocfs2_journal_dirty(handle, group_bh);
 138         if (ret < 0) {
 139                 mlog_errno(ret);
 140                 goto out_rollback;
 141         }
 142
 143         /* update the inode accordingly. */
 144         ret = ocfs2_journal_access_di(handle, bm_inode, bm_bh,
 145                                       OCFS2_JOURNAL_ACCESS_WRITE);
 146         if (ret < 0) {
 147                 mlog_errno(ret);
 148                 goto out_rollback;
 149         }
 150
 151         chain = le16_to_cpu(group->bg_chain);
 152         cr = (&cl->cl_recs[chain]);
 153         le32_add_cpu(&cr->c_total, num_bits);
 154         le32_add_cpu(&cr->c_free, num_bits);
 155         le32_add_cpu(&fe->id1.bitmap1.i_total, num_bits);
 156         le32_add_cpu(&fe->i_clusters, new_clusters);
 157
 158         if (backups) {
 159                 le32_add_cpu(&cr->c_free, -1 * backups);
 160                 le32_add_cpu(&fe->id1.bitmap1.i_used, backups);
 161         }
 162
 163         spin_lock(&OCFS2_I(bm_inode)->ip_lock);
 164         OCFS2_I(bm_inode)->ip_clusters = le32_to_cpu(fe->i_clusters);
 165         le64_add_cpu(&fe->i_size, new_clusters << osb->s_clustersize_bits);
 166         spin_unlock(&OCFS2_I(bm_inode)->ip_lock);
 167         i_size_write(bm_inode, le64_to_cpu(fe->i_size));
 168
 169         ocfs2_journal_dirty(handle, bm_bh);
 170
 171 out_rollback:
 172         if (ret < 0) {
 173                 ocfs2_calc_new_backup_super(bm_inode,
 174                                             group,
 175                                             new_clusters,
 176                                             first_new_cluster,
 177                                             cl_cpg, 0);
 178                 le16_add_cpu(&group->bg_free_bits_count, backups);
 179                 le16_add_cpu(&group->bg_bits, -1 * num_bits);
 180                 le16_add_cpu(&group->bg_free_bits_count, -1 * num_bits);
 181         }
 182 out:
 183         mlog_exit(ret);
 184         return ret;
 185 }
 186
 187 static int update_backups(struct inode * inode, u32 clusters, char *data)
 188 {
 189         int i, ret = 0;
 190         u32 cluster;
 191         u64 blkno;
 192         struct buffer_head *backup = NULL;
 193         struct ocfs2_dinode *backup_di = NULL;
 194         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 195
 196         /* calculate the real backups we need to update. */
 197         for (i = 0; i < OCFS2_MAX_BACKUP_SUPERBLOCKS; i++) {
 198                 blkno = ocfs2_backup_super_blkno(inode->i_sb, i);
 199                 cluster = ocfs2_blocks_to_clusters(inode->i_sb, blkno);
 200                 if (cluster > clusters)
 201                         break;
 202
 203                 ret = ocfs2_read_blocks_sync(osb, blkno, 1, &backup);
 204                 if (ret < 0) {
 205                         mlog_errno(ret);
 206                         break;
 207                 }
 208
 209                 memcpy(backup->b_data, data, inode->i_sb->s_blocksize);
 210
 211                 backup_di = (struct ocfs2_dinode *)backup->b_data;
 212                 backup_di->i_blkno = cpu_to_le64(blkno);
 213
 214                 ret = ocfs2_write_super_or_backup(osb, backup);
 215                 brelse(backup);
 216                 backup = NULL;
 217                 if (ret < 0) {
 218                         mlog_errno(ret);
 219                         break;
 220                 }
 221         }
 222
 223         return ret;
 224 }
 225
 226 static void ocfs2_update_super_and_backups(struct inode *inode,
 227                                            int new_clusters)
 228 {
 229         int ret;
 230         u32 clusters = 0;
 231         struct buffer_head *super_bh = NULL;
 232         struct ocfs2_dinode *super_di = NULL;
 233         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 234
 235         /*
 236          * update the superblock last.
 237          * It doesn't matter if the write failed.
 238          */
 239         ret = ocfs2_read_blocks_sync(osb, OCFS2_SUPER_BLOCK_BLKNO, 1,
 240                                      &super_bh);
 241         if (ret < 0) {
 242                 mlog_errno(ret);
 243                 goto out;
 244         }
 245
 246         super_di = (struct ocfs2_dinode *)super_bh->b_data;
 247         le32_add_cpu(&super_di->i_clusters, new_clusters);
 248         clusters = le32_to_cpu(super_di->i_clusters);
 249
 250         ret = ocfs2_write_super_or_backup(osb, super_bh);
 251         if (ret < 0) {
 252                 mlog_errno(ret);
 253                 goto out;
 254         }
 255
 256         if (OCFS2_HAS_COMPAT_FEATURE(osb->sb, OCFS2_FEATURE_COMPAT_BACKUP_SB))
 257                 ret = update_backups(inode, clusters, super_bh->b_data);
 258
 259 out:
 260         brelse(super_bh);
 261         if (ret)
 262                 printk(KERN_WARNING "ocfs2: Failed to update super blocks on %s"
 263                         " during fs resize. This condition is not fatal,"
 264                         " but fsck.ocfs2 should be run to fix it\n",
 265                         osb->dev_str);
 266         return;
 267 }
 268
 269 /*
 270  * Extend the filesystem to the new number of clusters specified.  This entry
 271  * point is only used to extend the current filesystem to the end of the last
 272  * existing group.
 273  */
 274 int ocfs2_group_extend(struct inode * inode, int new_clusters)
 275 {
 276         int ret;
 277         handle_t *handle;
 278         struct buffer_head *main_bm_bh = NULL;
 279         struct buffer_head *group_bh = NULL;
 280         struct inode *main_bm_inode = NULL;
 281         struct ocfs2_dinode *fe = NULL;
 282         struct ocfs2_group_desc *group = NULL;
 283         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 284         u16 cl_bpc;
 285         u32 first_new_cluster;
 286         u64 lgd_blkno;
 287
 288         mlog_entry_void();
 289
 290         if (ocfs2_is_hard_readonly(osb) || ocfs2_is_soft_readonly(osb))
 291                 return -EROFS;
 292
 293         if (new_clusters < 0)
 294                 return -EINVAL;
 295         else if (new_clusters == 0)
 296                 return 0;
 297
 298         main_bm_inode = ocfs2_get_system_file_inode(osb,
 299                                                     GLOBAL_BITMAP_SYSTEM_INODE,
 300                                                     OCFS2_INVALID_SLOT);
 301         if (!main_bm_inode) {
 302                 ret = -EINVAL;
 303                 mlog_errno(ret);
 304                 goto out;
 305         }
 306
 307         mutex_lock(&main_bm_inode->i_mutex);
 308
 309         ret = ocfs2_inode_lock(main_bm_inode, &main_bm_bh, 1);
 310         if (ret < 0) {
 311                 mlog_errno(ret);
 312                 goto out_mutex;
 313         }
 314
 315         fe = (struct ocfs2_dinode *)main_bm_bh->b_data;
 316
 317         /* main_bm_bh is validated by inode read inside ocfs2_inode_lock(),
 318          * so any corruption is a code bug. */
 319         BUG_ON(!OCFS2_IS_VALID_DINODE(fe));
 320
 321         if (le16_to_cpu(fe->id2.i_chain.cl_cpg) !=
 322                                  ocfs2_group_bitmap_size(osb->sb) * 8) {
 323                 mlog(ML_ERROR, "The disk is too old and small. "
 324                      "Force to do offline resize.");
 325                 ret = -EINVAL;
 326                 goto out_unlock;
 327         }
 328
 329         first_new_cluster = le32_to_cpu(fe->i_clusters);
 330         lgd_blkno = ocfs2_which_cluster_group(main_bm_inode,
 331                                               first_new_cluster - 1);
 332
 333         ret = ocfs2_read_group_descriptor(main_bm_inode, fe, lgd_blkno,
 334                                           &group_bh);
 335         if (ret < 0) {
 336                 mlog_errno(ret);
 337                 goto out_unlock;
 338         }
 339         group = (struct ocfs2_group_desc *)group_bh->b_data;
 340
 341         cl_bpc = le16_to_cpu(fe->id2.i_chain.cl_bpc);
 342         if (le16_to_cpu(group->bg_bits) / cl_bpc + new_clusters >
 343                 le16_to_cpu(fe->id2.i_chain.cl_cpg)) {
 344                 ret = -EINVAL;
 345                 goto out_unlock;
 346         }
 347
 348         mlog(0, "extend the last group at %llu, new clusters = %d\n",
 349              (unsigned long long)le64_to_cpu(group->bg_blkno), new_clusters);
 350
 351         handle = ocfs2_start_trans(osb, OCFS2_GROUP_EXTEND_CREDITS);
 352         if (IS_ERR(handle)) {
 353                 mlog_errno(PTR_ERR(handle));
 354                 ret = -EINVAL;
 355                 goto out_unlock;
 356         }
 357
 358         /* update the last group descriptor and inode. */
 359         ret = ocfs2_update_last_group_and_inode(handle, main_bm_inode,
 360                                                 main_bm_bh, group_bh,
 361                                                 first_new_cluster,
 362                                                 new_clusters);
 363         if (ret) {
 364                 mlog_errno(ret);
 365                 goto out_commit;
 366         }
 367
 368         ocfs2_update_super_and_backups(main_bm_inode, new_clusters);
 369
 370 out_commit:
 371         ocfs2_commit_trans(osb, handle);
 372 out_unlock:
 373         brelse(group_bh);
 374         brelse(main_bm_bh);
 375
 376         ocfs2_inode_unlock(main_bm_inode, 1);
 377
 378 out_mutex:
 379         mutex_unlock(&main_bm_inode->i_mutex);
 380         iput(main_bm_inode);
 381
 382 out:
 383         mlog_exit_void();
 384         return ret;
 385 }
 386
 387 static int ocfs2_check_new_group(struct inode *inode,
 388                                  struct ocfs2_dinode *di,
 389                                  struct ocfs2_new_group_input *input,
 390                                  struct buffer_head *group_bh)
 391 {
 392         int ret;
 393         struct ocfs2_group_desc *gd =
 394                 (struct ocfs2_group_desc *)group_bh->b_data;
 395         u16 cl_bpc = le16_to_cpu(di->id2.i_chain.cl_bpc);
 396
 397         ret = ocfs2_check_group_descriptor(inode->i_sb, di, group_bh);
 398         if (ret)
 399                 goto out;
 400
 401         ret = -EINVAL;
 402         if (le16_to_cpu(gd->bg_chain) != input->chain)
 403                 mlog(ML_ERROR, "Group descriptor # %llu has bad chain %u "
 404                      "while input has %u set.\n",
 405                      (unsigned long long)le64_to_cpu(gd->bg_blkno),
 406                      le16_to_cpu(gd->bg_chain), input->chain);
 407         else if (le16_to_cpu(gd->bg_bits) != input->clusters * cl_bpc)
 408                 mlog(ML_ERROR, "Group descriptor # %llu has bit count %u but "
 409                      "input has %u clusters set\n",
 410                      (unsigned long long)le64_to_cpu(gd->bg_blkno),
 411                      le16_to_cpu(gd->bg_bits), input->clusters);
 412         else if (le16_to_cpu(gd->bg_free_bits_count) != input->frees * cl_bpc)
 413                 mlog(ML_ERROR, "Group descriptor # %llu has free bit count %u "
 414                      "but it should have %u set\n",
 415                      (unsigned long long)le64_to_cpu(gd->bg_blkno),
 416                      le16_to_cpu(gd->bg_bits),
 417                      input->frees * cl_bpc);
 418         else
 419                 ret = 0;
 420
 421 out:
 422         return ret;
 423 }
 424
 425 static int ocfs2_verify_group_and_input(struct inode *inode,
 426                                         struct ocfs2_dinode *di,
 427                                         struct ocfs2_new_group_input *input,
 428                                         struct buffer_head *group_bh)
 429 {
 430         u16 cl_count = le16_to_cpu(di->id2.i_chain.cl_count);
 431         u16 cl_cpg = le16_to_cpu(di->id2.i_chain.cl_cpg);
 432         u16 next_free = le16_to_cpu(di->id2.i_chain.cl_next_free_rec);
 433         u32 cluster = ocfs2_blocks_to_clusters(inode->i_sb, input->group);
 434         u32 total_clusters = le32_to_cpu(di->i_clusters);
 435         int ret = -EINVAL;
 436
 437         if (cluster < total_clusters)
 438                 mlog(ML_ERROR, "add a group which is in the current volume.\n");
 439         else if (input->chain >= cl_count)
 440                 mlog(ML_ERROR, "input chain exceeds the limit.\n");
 441         else if (next_free != cl_count && next_free != input->chain)
 442                 mlog(ML_ERROR,
 443                      "the add group should be in chain %u\n", next_free);
 444         else if (total_clusters + input->clusters < total_clusters)
 445                 mlog(ML_ERROR, "add group's clusters overflow.\n");
 446         else if (input->clusters > cl_cpg)
 447                 mlog(ML_ERROR, "the cluster exceeds the maximum of a group\n");
 448         else if (input->frees > input->clusters)
 449                 mlog(ML_ERROR, "the free cluster exceeds the total clusters\n");
 450         else if (total_clusters % cl_cpg != 0)
 451                 mlog(ML_ERROR,
 452                      "the last group isn't full. Use group extend first.\n");
 453         else if (input->group != ocfs2_which_cluster_group(inode, cluster))
 454                 mlog(ML_ERROR, "group blkno is invalid\n");
 455         else if ((ret = ocfs2_check_new_group(inode, di, input, group_bh)))
 456                 mlog(ML_ERROR, "group descriptor check failed.\n");
 457         else
 458                 ret = 0;
 459
 460         return ret;
 461 }
 462
 463 /* Add a new group descriptor to global_bitmap. */
 464 int ocfs2_group_add(struct inode *inode, struct ocfs2_new_group_input *input)
 465 {
 466         int ret;
 467         handle_t *handle;
 468         struct buffer_head *main_bm_bh = NULL;
 469         struct inode *main_bm_inode = NULL;
 470         struct ocfs2_dinode *fe = NULL;
 471         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 472         struct buffer_head *group_bh = NULL;
 473         struct ocfs2_group_desc *group = NULL;
 474         struct ocfs2_chain_list *cl;
 475         struct ocfs2_chain_rec *cr;
 476         u16 cl_bpc;
 477
 478         mlog_entry_void();
 479
 480         if (ocfs2_is_hard_readonly(osb) || ocfs2_is_soft_readonly(osb))
 481                 return -EROFS;
 482
 483         main_bm_inode = ocfs2_get_system_file_inode(osb,
 484                                                     GLOBAL_BITMAP_SYSTEM_INODE,
 485                                                     OCFS2_INVALID_SLOT);
 486         if (!main_bm_inode) {
 487                 ret = -EINVAL;
 488                 mlog_errno(ret);
 489                 goto out;
 490         }
 491
 492         mutex_lock(&main_bm_inode->i_mutex);
 493
 494         ret = ocfs2_inode_lock(main_bm_inode, &main_bm_bh, 1);
 495         if (ret < 0) {
 496                 mlog_errno(ret);
 497                 goto out_mutex;
 498         }
 499
 500         fe = (struct ocfs2_dinode *)main_bm_bh->b_data;
 501
 502         if (le16_to_cpu(fe->id2.i_chain.cl_cpg) !=
 503                                  ocfs2_group_bitmap_size(osb->sb) * 8) {
 504                 mlog(ML_ERROR, "The disk is too old and small."
 505                      " Force to do offline resize.");
 506                 ret = -EINVAL;
 507                 goto out_unlock;
 508         }
 509
 510         ret = ocfs2_read_blocks_sync(osb, input->group, 1, &group_bh);
 511         if (ret < 0) {
 512                 mlog(ML_ERROR, "Can't read the group descriptor # %llu "
 513                      "from the device.", (unsigned long long)input->group);
 514                 goto out_unlock;
 515         }
 516
 517         ocfs2_set_new_buffer_uptodate(inode, group_bh);
 518
 519         ret = ocfs2_verify_group_and_input(main_bm_inode, fe, input, group_bh);
 520         if (ret) {
 521                 mlog_errno(ret);
 522                 goto out_unlock;
 523         }
 524
 525         mlog(0, "Add a new group  %llu in chain = %u, length = %u\n",
 526              (unsigned long long)input->group, input->chain, input->clusters);
 527
 528         handle = ocfs2_start_trans(osb, OCFS2_GROUP_ADD_CREDITS);
 529         if (IS_ERR(handle)) {
 530                 mlog_errno(PTR_ERR(handle));
 531                 ret = -EINVAL;
 532                 goto out_unlock;
 533         }
 534
 535         cl_bpc = le16_to_cpu(fe->id2.i_chain.cl_bpc);
 536         cl = &fe->id2.i_chain;
 537         cr = &cl->cl_recs[input->chain];
 538
 539         ret = ocfs2_journal_access_gd(handle, main_bm_inode, group_bh,
 540                                       OCFS2_JOURNAL_ACCESS_WRITE);
 541         if (ret < 0) {
 542                 mlog_errno(ret);
 543                 goto out_commit;
 544         }
 545
 546         group = (struct ocfs2_group_desc *)group_bh->b_data;
 547         group->bg_next_group = cr->c_blkno;
 548
 549         ret = ocfs2_journal_dirty(handle, group_bh);
 550         if (ret < 0) {
 551                 mlog_errno(ret);
 552                 goto out_commit;
 553         }
 554
 555         ret = ocfs2_journal_access_di(handle, main_bm_inode, main_bm_bh,
 556                                       OCFS2_JOURNAL_ACCESS_WRITE);
 557         if (ret < 0) {
 558                 mlog_errno(ret);
 559                 goto out_commit;
 560         }
 561
 562         if (input->chain == le16_to_cpu(cl->cl_next_free_rec)) {
 563                 le16_add_cpu(&cl->cl_next_free_rec, 1);
 564                 memset(cr, 0, sizeof(struct ocfs2_chain_rec));
 565         }
 566
 567         cr->c_blkno = cpu_to_le64(input->group);
 568         le32_add_cpu(&cr->c_total, input->clusters * cl_bpc);
 569         le32_add_cpu(&cr->c_free, input->frees * cl_bpc);
 570
 571         le32_add_cpu(&fe->id1.bitmap1.i_total, input->clusters *cl_bpc);
 572         le32_add_cpu(&fe->id1.bitmap1.i_used,
 573                      (input->clusters - input->frees) * cl_bpc);
 574         le32_add_cpu(&fe->i_clusters, input->clusters);
 575
 576         ocfs2_journal_dirty(handle, main_bm_bh);
 577
 578         spin_lock(&OCFS2_I(main_bm_inode)->ip_lock);
 579         OCFS2_I(main_bm_inode)->ip_clusters = le32_to_cpu(fe->i_clusters);
 580         le64_add_cpu(&fe->i_size, input->clusters << osb->s_clustersize_bits);
 581         spin_unlock(&OCFS2_I(main_bm_inode)->ip_lock);
 582         i_size_write(main_bm_inode, le64_to_cpu(fe->i_size));
 583
 584         ocfs2_update_super_and_backups(main_bm_inode, input->clusters);
 585
 586 out_commit:
 587         ocfs2_commit_trans(osb, handle);
 588 out_unlock:
 589         brelse(group_bh);
 590         brelse(main_bm_bh);
 591
 592         ocfs2_inode_unlock(main_bm_inode, 1);
 593
 594 out_mutex:
 595         mutex_unlock(&main_bm_inode->i_mutex);
 596         iput(main_bm_inode);
 597
 598 out:
 599         mlog_exit_void();
 600         return ret;
 601 }