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 #include "ocfs2_trace.h"
  43
  44 #include "buffer_head_io.h"
  45 #include "suballoc.h"
  46 #include "resize.h"
  47
  48 /*
  49  * Check whether there are new backup superblocks exist
  50  * in the last group. If there are some, mark them or clear
  51  * them in the bitmap.
  52  *
  53  * Return how many backups we find in the last group.
  54  */
  55 static u16 ocfs2_calc_new_backup_super(struct inode *inode,
  56                                        struct ocfs2_group_desc *gd,
  57                                        int new_clusters,
  58                                        u32 first_new_cluster,
  59                                        u16 cl_cpg,
  60                                        int set)
  61 {
  62         int i;
  63         u16 backups = 0;
  64         u32 cluster;
  65         u64 blkno, gd_blkno, lgd_blkno = le64_to_cpu(gd->bg_blkno);
  66
  67         for (i = 0; i < OCFS2_MAX_BACKUP_SUPERBLOCKS; i++) {
  68                 blkno = ocfs2_backup_super_blkno(inode->i_sb, i);
  69                 cluster = ocfs2_blocks_to_clusters(inode->i_sb, blkno);
  70
  71                 gd_blkno = ocfs2_which_cluster_group(inode, cluster);
  72                 if (gd_blkno < lgd_blkno)
  73                         continue;
  74                 else if (gd_blkno > lgd_blkno)
  75                         break;
  76
  77                 if (set)
  78                         ocfs2_set_bit(cluster % cl_cpg,
  79                                       (unsigned long *)gd->bg_bitmap);
  80                 else
  81                         ocfs2_clear_bit(cluster % cl_cpg,
  82                                         (unsigned long *)gd->bg_bitmap);
  83                 backups++;
  84         }
  85
  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         trace_ocfs2_update_last_group_and_inode(new_clusters,
 107                                                 first_new_cluster);
 108
 109         ret = ocfs2_journal_access_gd(handle, INODE_CACHE(bm_inode),
 110                                       group_bh, 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         ocfs2_journal_dirty(handle, group_bh);
 138
 139         /* update the inode accordingly. */
 140         ret = ocfs2_journal_access_di(handle, INODE_CACHE(bm_inode), bm_bh,
 141                                       OCFS2_JOURNAL_ACCESS_WRITE);
 142         if (ret < 0) {
 143                 mlog_errno(ret);
 144                 goto out_rollback;
 145         }
 146
 147         chain = le16_to_cpu(group->bg_chain);
 148         cr = (&cl->cl_recs[chain]);
 149         le32_add_cpu(&cr->c_total, num_bits);
 150         le32_add_cpu(&cr->c_free, num_bits);
 151         le32_add_cpu(&fe->id1.bitmap1.i_total, num_bits);
 152         le32_add_cpu(&fe->i_clusters, new_clusters);
 153
 154         if (backups) {
 155                 le32_add_cpu(&cr->c_free, -1 * backups);
 156                 le32_add_cpu(&fe->id1.bitmap1.i_used, backups);
 157         }
 158
 159         spin_lock(&OCFS2_I(bm_inode)->ip_lock);
 160         OCFS2_I(bm_inode)->ip_clusters = le32_to_cpu(fe->i_clusters);
 161         le64_add_cpu(&fe->i_size, new_clusters << osb->s_clustersize_bits);
 162         spin_unlock(&OCFS2_I(bm_inode)->ip_lock);
 163         i_size_write(bm_inode, le64_to_cpu(fe->i_size));
 164
 165         ocfs2_journal_dirty(handle, bm_bh);
 166
 167 out_rollback:
 168         if (ret < 0) {
 169                 ocfs2_calc_new_backup_super(bm_inode,
 170                                             group,
 171                                             new_clusters,
 172                                             first_new_cluster,
 173                                             cl_cpg, 0);
 174                 le16_add_cpu(&group->bg_free_bits_count, backups);
 175                 le16_add_cpu(&group->bg_bits, -1 * num_bits);
 176                 le16_add_cpu(&group->bg_free_bits_count, -1 * num_bits);
 177         }
 178 out:
 179         if (ret)
 180                 mlog_errno(ret);
 181         return ret;
 182 }
 183
 184 static int update_backups(struct inode * inode, u32 clusters, char *data)
 185 {
 186         int i, ret = 0;
 187         u32 cluster;
 188         u64 blkno;
 189         struct buffer_head *backup = NULL;
 190         struct ocfs2_dinode *backup_di = NULL;
 191         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 192
 193         /* calculate the real backups we need to update. */
 194         for (i = 0; i < OCFS2_MAX_BACKUP_SUPERBLOCKS; i++) {
 195                 blkno = ocfs2_backup_super_blkno(inode->i_sb, i);
 196                 cluster = ocfs2_blocks_to_clusters(inode->i_sb, blkno);
 197                 if (cluster > clusters)
 198                         break;
 199
 200                 ret = ocfs2_read_blocks_sync(osb, blkno, 1, &backup);
 201                 if (ret < 0) {
 202                         mlog_errno(ret);
 203                         break;
 204                 }
 205
 206                 memcpy(backup->b_data, data, inode->i_sb->s_blocksize);
 207
 208                 backup_di = (struct ocfs2_dinode *)backup->b_data;
 209                 backup_di->i_blkno = cpu_to_le64(blkno);
 210
 211                 ret = ocfs2_write_super_or_backup(osb, backup);
 212                 brelse(backup);
 213                 backup = NULL;
 214                 if (ret < 0) {
 215                         mlog_errno(ret);
 216                         break;
 217                 }
 218         }
 219
 220         return ret;
 221 }
 222
 223 static void ocfs2_update_super_and_backups(struct inode *inode,
 224                                            int new_clusters)
 225 {
 226         int ret;
 227         u32 clusters = 0;
 228         struct buffer_head *super_bh = NULL;
 229         struct ocfs2_dinode *super_di = NULL;
 230         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 231
 232         /*
 233          * update the superblock last.
 234          * It doesn't matter if the write failed.
 235          */
 236         ret = ocfs2_read_blocks_sync(osb, OCFS2_SUPER_BLOCK_BLKNO, 1,
 237                                      &super_bh);
 238         if (ret < 0) {
 239                 mlog_errno(ret);
 240                 goto out;
 241         }
 242
 243         super_di = (struct ocfs2_dinode *)super_bh->b_data;
 244         le32_add_cpu(&super_di->i_clusters, new_clusters);
 245         clusters = le32_to_cpu(super_di->i_clusters);
 246
 247         ret = ocfs2_write_super_or_backup(osb, super_bh);
 248         if (ret < 0) {
 249                 mlog_errno(ret);
 250                 goto out;
 251         }
 252
 253         if (OCFS2_HAS_COMPAT_FEATURE(osb->sb, OCFS2_FEATURE_COMPAT_BACKUP_SB))
 254                 ret = update_backups(inode, clusters, super_bh->b_data);
 255
 256 out:
 257         brelse(super_bh);
 258         if (ret)
 259                 printk(KERN_WARNING "ocfs2: Failed to update super blocks on %s"
 260                         " during fs resize. This condition is not fatal,"
 261                         " but fsck.ocfs2 should be run to fix it\n",
 262                         osb->dev_str);
 263         return;
 264 }
 265
 266 /*
 267  * Extend the filesystem to the new number of clusters specified.  This entry
 268  * point is only used to extend the current filesystem to the end of the last
 269  * existing group.
 270  */
 271 int ocfs2_group_extend(struct inode * inode, int new_clusters)
 272 {
 273         int ret;
 274         handle_t *handle;
 275         struct buffer_head *main_bm_bh = NULL;
 276         struct buffer_head *group_bh = NULL;
 277         struct inode *main_bm_inode = NULL;
 278         struct ocfs2_dinode *fe = NULL;
 279         struct ocfs2_group_desc *group = NULL;
 280         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 281         u16 cl_bpc;
 282         u32 first_new_cluster;
 283         u64 lgd_blkno;
 284
 285         if (ocfs2_is_hard_readonly(osb) || ocfs2_is_soft_readonly(osb))
 286                 return -EROFS;
 287
 288         if (new_clusters < 0)
 289                 return -EINVAL;
 290         else if (new_clusters == 0)
 291                 return 0;
 292
 293         main_bm_inode = ocfs2_get_system_file_inode(osb,
 294                                                     GLOBAL_BITMAP_SYSTEM_INODE,
 295                                                     OCFS2_INVALID_SLOT);
 296         if (!main_bm_inode) {
 297                 ret = -EINVAL;
 298                 mlog_errno(ret);
 299                 goto out;
 300         }
 301
 302         mutex_lock(&main_bm_inode->i_mutex);
 303
 304         ret = ocfs2_inode_lock(main_bm_inode, &main_bm_bh, 1);
 305         if (ret < 0) {
 306                 mlog_errno(ret);
 307                 goto out_mutex;
 308         }
 309
 310         fe = (struct ocfs2_dinode *)main_bm_bh->b_data;
 311
 312         /* main_bm_bh is validated by inode read inside ocfs2_inode_lock(),
 313          * so any corruption is a code bug. */
 314         BUG_ON(!OCFS2_IS_VALID_DINODE(fe));
 315
 316         if (le16_to_cpu(fe->id2.i_chain.cl_cpg) !=
 317                 ocfs2_group_bitmap_size(osb->sb, 0,
 318                                         osb->s_feature_incompat) * 8) {
 319                 mlog(ML_ERROR, "The disk is too old and small. "
 320                      "Force to do offline resize.");
 321                 ret = -EINVAL;
 322                 goto out_unlock;
 323         }
 324
 325         first_new_cluster = le32_to_cpu(fe->i_clusters);
 326         lgd_blkno = ocfs2_which_cluster_group(main_bm_inode,
 327                                               first_new_cluster - 1);
 328
 329         ret = ocfs2_read_group_descriptor(main_bm_inode, fe, lgd_blkno,
 330                                           &group_bh);
 331         if (ret < 0) {
 332                 mlog_errno(ret);
 333                 goto out_unlock;
 334         }
 335         group = (struct ocfs2_group_desc *)group_bh->b_data;
 336
 337         cl_bpc = le16_to_cpu(fe->id2.i_chain.cl_bpc);
 338         if (le16_to_cpu(group->bg_bits) / cl_bpc + new_clusters >
 339                 le16_to_cpu(fe->id2.i_chain.cl_cpg)) {
 340                 ret = -EINVAL;
 341                 goto out_unlock;
 342         }
 343
 344
 345         trace_ocfs2_group_extend(
 346              (unsigned long long)le64_to_cpu(group->bg_blkno), new_clusters);
 347
 348         handle = ocfs2_start_trans(osb, OCFS2_GROUP_EXTEND_CREDITS);
 349         if (IS_ERR(handle)) {
 350                 mlog_errno(PTR_ERR(handle));
 351                 ret = -EINVAL;
 352                 goto out_unlock;
 353         }
 354
 355         /* update the last group descriptor and inode. */
 356         ret = ocfs2_update_last_group_and_inode(handle, main_bm_inode,
 357                                                 main_bm_bh, group_bh,
 358                                                 first_new_cluster,
 359                                                 new_clusters);
 360         if (ret) {
 361                 mlog_errno(ret);
 362                 goto out_commit;
 363         }
 364
 365         ocfs2_update_super_and_backups(main_bm_inode, new_clusters);
 366
 367 out_commit:
 368         ocfs2_commit_trans(osb, handle);
 369 out_unlock:
 370         brelse(group_bh);
 371         brelse(main_bm_bh);
 372
 373         ocfs2_inode_unlock(main_bm_inode, 1);
 374
 375 out_mutex:
 376         mutex_unlock(&main_bm_inode->i_mutex);
 377         iput(main_bm_inode);
 378
 379 out:
 380         return ret;
 381 }
 382
 383 static int ocfs2_check_new_group(struct inode *inode,
 384                                  struct ocfs2_dinode *di,
 385                                  struct ocfs2_new_group_input *input,
 386                                  struct buffer_head *group_bh)
 387 {
 388         int ret;
 389         struct ocfs2_group_desc *gd =
 390                 (struct ocfs2_group_desc *)group_bh->b_data;
 391         u16 cl_bpc = le16_to_cpu(di->id2.i_chain.cl_bpc);
 392
 393         ret = ocfs2_check_group_descriptor(inode->i_sb, di, group_bh);
 394         if (ret)
 395                 goto out;
 396
 397         ret = -EINVAL;
 398         if (le16_to_cpu(gd->bg_chain) != input->chain)
 399                 mlog(ML_ERROR, "Group descriptor # %llu has bad chain %u "
 400                      "while input has %u set.\n",
 401                      (unsigned long long)le64_to_cpu(gd->bg_blkno),
 402                      le16_to_cpu(gd->bg_chain), input->chain);
 403         else if (le16_to_cpu(gd->bg_bits) != input->clusters * cl_bpc)
 404                 mlog(ML_ERROR, "Group descriptor # %llu has bit count %u but "
 405                      "input has %u clusters set\n",
 406                      (unsigned long long)le64_to_cpu(gd->bg_blkno),
 407                      le16_to_cpu(gd->bg_bits), input->clusters);
 408         else if (le16_to_cpu(gd->bg_free_bits_count) != input->frees * cl_bpc)
 409                 mlog(ML_ERROR, "Group descriptor # %llu has free bit count %u "
 410                      "but it should have %u set\n",
 411                      (unsigned long long)le64_to_cpu(gd->bg_blkno),
 412                      le16_to_cpu(gd->bg_bits),
 413                      input->frees * cl_bpc);
 414         else
 415                 ret = 0;
 416
 417 out:
 418         return ret;
 419 }
 420
 421 static int ocfs2_verify_group_and_input(struct inode *inode,
 422                                         struct ocfs2_dinode *di,
 423                                         struct ocfs2_new_group_input *input,
 424                                         struct buffer_head *group_bh)
 425 {
 426         u16 cl_count = le16_to_cpu(di->id2.i_chain.cl_count);
 427         u16 cl_cpg = le16_to_cpu(di->id2.i_chain.cl_cpg);
 428         u16 next_free = le16_to_cpu(di->id2.i_chain.cl_next_free_rec);
 429         u32 cluster = ocfs2_blocks_to_clusters(inode->i_sb, input->group);
 430         u32 total_clusters = le32_to_cpu(di->i_clusters);
 431         int ret = -EINVAL;
 432
 433         if (cluster < total_clusters)
 434                 mlog(ML_ERROR, "add a group which is in the current volume.\n");
 435         else if (input->chain >= cl_count)
 436                 mlog(ML_ERROR, "input chain exceeds the limit.\n");
 437         else if (next_free != cl_count && next_free != input->chain)
 438                 mlog(ML_ERROR,
 439                      "the add group should be in chain %u\n", next_free);
 440         else if (total_clusters + input->clusters < total_clusters)
 441                 mlog(ML_ERROR, "add group's clusters overflow.\n");
 442         else if (input->clusters > cl_cpg)
 443                 mlog(ML_ERROR, "the cluster exceeds the maximum of a group\n");
 444         else if (input->frees > input->clusters)
 445                 mlog(ML_ERROR, "the free cluster exceeds the total clusters\n");
 446         else if (total_clusters % cl_cpg != 0)
 447                 mlog(ML_ERROR,
 448                      "the last group isn't full. Use group extend first.\n");
 449         else if (input->group != ocfs2_which_cluster_group(inode, cluster))
 450                 mlog(ML_ERROR, "group blkno is invalid\n");
 451         else if ((ret = ocfs2_check_new_group(inode, di, input, group_bh)))
 452                 mlog(ML_ERROR, "group descriptor check failed.\n");
 453         else
 454                 ret = 0;
 455
 456         return ret;
 457 }
 458
 459 /* Add a new group descriptor to global_bitmap. */
 460 int ocfs2_group_add(struct inode *inode, struct ocfs2_new_group_input *input)
 461 {
 462         int ret;
 463         handle_t *handle;
 464         struct buffer_head *main_bm_bh = NULL;
 465         struct inode *main_bm_inode = NULL;
 466         struct ocfs2_dinode *fe = NULL;
 467         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 468         struct buffer_head *group_bh = NULL;
 469         struct ocfs2_group_desc *group = NULL;
 470         struct ocfs2_chain_list *cl;
 471         struct ocfs2_chain_rec *cr;
 472         u16 cl_bpc;
 473
 474         if (ocfs2_is_hard_readonly(osb) || ocfs2_is_soft_readonly(osb))
 475                 return -EROFS;
 476
 477         main_bm_inode = ocfs2_get_system_file_inode(osb,
 478                                                     GLOBAL_BITMAP_SYSTEM_INODE,
 479                                                     OCFS2_INVALID_SLOT);
 480         if (!main_bm_inode) {
 481                 ret = -EINVAL;
 482                 mlog_errno(ret);
 483                 goto out;
 484         }
 485
 486         mutex_lock(&main_bm_inode->i_mutex);
 487
 488         ret = ocfs2_inode_lock(main_bm_inode, &main_bm_bh, 1);
 489         if (ret < 0) {
 490                 mlog_errno(ret);
 491                 goto out_mutex;
 492         }
 493
 494         fe = (struct ocfs2_dinode *)main_bm_bh->b_data;
 495
 496         if (le16_to_cpu(fe->id2.i_chain.cl_cpg) !=
 497                 ocfs2_group_bitmap_size(osb->sb, 0,
 498                                         osb->s_feature_incompat) * 8) {
 499                 mlog(ML_ERROR, "The disk is too old and small."
 500                      " Force to do offline resize.");
 501                 ret = -EINVAL;
 502                 goto out_unlock;
 503         }
 504
 505         ret = ocfs2_read_blocks_sync(osb, input->group, 1, &group_bh);
 506         if (ret < 0) {
 507                 mlog(ML_ERROR, "Can't read the group descriptor # %llu "
 508                      "from the device.", (unsigned long long)input->group);
 509                 goto out_unlock;
 510         }
 511
 512         ocfs2_set_new_buffer_uptodate(INODE_CACHE(inode), group_bh);
 513
 514         ret = ocfs2_verify_group_and_input(main_bm_inode, fe, input, group_bh);
 515         if (ret) {
 516                 mlog_errno(ret);
 517                 goto out_unlock;
 518         }
 519
 520         trace_ocfs2_group_add((unsigned long long)input->group,
 521                                input->chain, input->clusters, input->frees);
 522
 523         handle = ocfs2_start_trans(osb, OCFS2_GROUP_ADD_CREDITS);
 524         if (IS_ERR(handle)) {
 525                 mlog_errno(PTR_ERR(handle));
 526                 ret = -EINVAL;
 527                 goto out_unlock;
 528         }
 529
 530         cl_bpc = le16_to_cpu(fe->id2.i_chain.cl_bpc);
 531         cl = &fe->id2.i_chain;
 532         cr = &cl->cl_recs[input->chain];
 533
 534         ret = ocfs2_journal_access_gd(handle, INODE_CACHE(main_bm_inode),
 535                                       group_bh, OCFS2_JOURNAL_ACCESS_WRITE);
 536         if (ret < 0) {
 537                 mlog_errno(ret);
 538                 goto out_commit;
 539         }
 540
 541         group = (struct ocfs2_group_desc *)group_bh->b_data;
 542         group->bg_next_group = cr->c_blkno;
 543         ocfs2_journal_dirty(handle, group_bh);
 544
 545         ret = ocfs2_journal_access_di(handle, INODE_CACHE(main_bm_inode),
 546                                       main_bm_bh, OCFS2_JOURNAL_ACCESS_WRITE);
 547         if (ret < 0) {
 548                 mlog_errno(ret);
 549                 goto out_commit;
 550         }
 551
 552         if (input->chain == le16_to_cpu(cl->cl_next_free_rec)) {
 553                 le16_add_cpu(&cl->cl_next_free_rec, 1);
 554                 memset(cr, 0, sizeof(struct ocfs2_chain_rec));
 555         }
 556
 557         cr->c_blkno = cpu_to_le64(input->group);
 558         le32_add_cpu(&cr->c_total, input->clusters * cl_bpc);
 559         le32_add_cpu(&cr->c_free, input->frees * cl_bpc);
 560
 561         le32_add_cpu(&fe->id1.bitmap1.i_total, input->clusters *cl_bpc);
 562         le32_add_cpu(&fe->id1.bitmap1.i_used,
 563                      (input->clusters - input->frees) * cl_bpc);
 564         le32_add_cpu(&fe->i_clusters, input->clusters);
 565
 566         ocfs2_journal_dirty(handle, main_bm_bh);
 567
 568         spin_lock(&OCFS2_I(main_bm_inode)->ip_lock);
 569         OCFS2_I(main_bm_inode)->ip_clusters = le32_to_cpu(fe->i_clusters);
 570         le64_add_cpu(&fe->i_size, input->clusters << osb->s_clustersize_bits);
 571         spin_unlock(&OCFS2_I(main_bm_inode)->ip_lock);
 572         i_size_write(main_bm_inode, le64_to_cpu(fe->i_size));
 573
 574         ocfs2_update_super_and_backups(main_bm_inode, input->clusters);
 575
 576 out_commit:
 577         ocfs2_commit_trans(osb, handle);
 578 out_unlock:
 579         brelse(group_bh);
 580         brelse(main_bm_bh);
 581
 582         ocfs2_inode_unlock(main_bm_inode, 1);
 583
 584 out_mutex:
 585         mutex_unlock(&main_bm_inode->i_mutex);
 586         iput(main_bm_inode);
 587
 588 out:
 589         return ret;
 590 }