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 #include <cluster/masklog.h>
  31
  32 #include "ocfs2.h"
  33
  34 #include "alloc.h"
  35 #include "dlmglue.h"
  36 #include "inode.h"
  37 #include "journal.h"
  38 #include "super.h"
  39 #include "sysfile.h"
  40 #include "uptodate.h"
  41 #include "ocfs2_trace.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                                        u16 old_bg_clusters,
  60                                        int set)
  61 {
  62         int i;
  63         u16 backups = 0;
  64         u32 cluster, lgd_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                 /* check if already done backup super */
  78                 lgd_cluster = ocfs2_blocks_to_clusters(inode->i_sb, lgd_blkno);
  79                 lgd_cluster += old_bg_clusters;
  80                 if (lgd_cluster >= cluster)
  81                         continue;
  82
  83                 if (set)
  84                         ocfs2_set_bit(cluster % cl_cpg,
  85                                       (unsigned long *)gd->bg_bitmap);
  86                 else
  87                         ocfs2_clear_bit(cluster % cl_cpg,
  88                                         (unsigned long *)gd->bg_bitmap);
  89                 backups++;
  90         }
  91
  92         return backups;
  93 }
  94
  95 static int ocfs2_update_last_group_and_inode(handle_t *handle,
  96                                              struct inode *bm_inode,
  97                                              struct buffer_head *bm_bh,
  98                                              struct buffer_head *group_bh,
  99                                              u32 first_new_cluster,
 100                                              int new_clusters)
 101 {
 102         int ret = 0;
 103         struct ocfs2_super *osb = OCFS2_SB(bm_inode->i_sb);
 104         struct ocfs2_dinode *fe = (struct ocfs2_dinode *) bm_bh->b_data;
 105         struct ocfs2_chain_list *cl = &fe->id2.i_chain;
 106         struct ocfs2_chain_rec *cr;
 107         struct ocfs2_group_desc *group;
 108         u16 chain, num_bits, backups = 0;
 109         u16 cl_bpc = le16_to_cpu(cl->cl_bpc);
 110         u16 cl_cpg = le16_to_cpu(cl->cl_cpg);
 111         u16 old_bg_clusters;
 112
 113         trace_ocfs2_update_last_group_and_inode(new_clusters,
 114                                                 first_new_cluster);
 115
 116         ret = ocfs2_journal_access_gd(handle, INODE_CACHE(bm_inode),
 117                                       group_bh, OCFS2_JOURNAL_ACCESS_WRITE);
 118         if (ret < 0) {
 119                 mlog_errno(ret);
 120                 goto out;
 121         }
 122
 123         group = (struct ocfs2_group_desc *)group_bh->b_data;
 124
 125         old_bg_clusters = le16_to_cpu(group->bg_bits) / cl_bpc;
 126         /* update the group first. */
 127         num_bits = new_clusters * cl_bpc;
 128         le16_add_cpu(&group->bg_bits, num_bits);
 129         le16_add_cpu(&group->bg_free_bits_count, num_bits);
 130
 131         /*
 132          * check whether there are some new backup superblocks exist in
 133          * this group and update the group bitmap accordingly.
 134          */
 135         if (OCFS2_HAS_COMPAT_FEATURE(osb->sb,
 136                                      OCFS2_FEATURE_COMPAT_BACKUP_SB)) {
 137                 backups = ocfs2_calc_new_backup_super(bm_inode,
 138                                                      group,
 139                                                      new_clusters,
 140                                                      first_new_cluster,
 141                                                      cl_cpg, old_bg_clusters, 1);
 142                 le16_add_cpu(&group->bg_free_bits_count, -1 * backups);
 143         }
 144
 145         ocfs2_journal_dirty(handle, group_bh);
 146
 147         /* update the inode accordingly. */
 148         ret = ocfs2_journal_access_di(handle, INODE_CACHE(bm_inode), bm_bh,
 149                                       OCFS2_JOURNAL_ACCESS_WRITE);
 150         if (ret < 0) {
 151                 mlog_errno(ret);
 152                 goto out_rollback;
 153         }
 154
 155         chain = le16_to_cpu(group->bg_chain);
 156         cr = (&cl->cl_recs[chain]);
 157         le32_add_cpu(&cr->c_total, num_bits);
 158         le32_add_cpu(&cr->c_free, num_bits);
 159         le32_add_cpu(&fe->id1.bitmap1.i_total, num_bits);
 160         le32_add_cpu(&fe->i_clusters, new_clusters);
 161
 162         if (backups) {
 163                 le32_add_cpu(&cr->c_free, -1 * backups);
 164                 le32_add_cpu(&fe->id1.bitmap1.i_used, backups);
 165         }
 166
 167         spin_lock(&OCFS2_I(bm_inode)->ip_lock);
 168         OCFS2_I(bm_inode)->ip_clusters = le32_to_cpu(fe->i_clusters);
 169         le64_add_cpu(&fe->i_size, new_clusters << osb->s_clustersize_bits);
 170         spin_unlock(&OCFS2_I(bm_inode)->ip_lock);
 171         i_size_write(bm_inode, le64_to_cpu(fe->i_size));
 172
 173         ocfs2_journal_dirty(handle, bm_bh);
 174
 175 out_rollback:
 176         if (ret < 0) {
 177                 ocfs2_calc_new_backup_super(bm_inode,
 178                                             group,
 179                                             new_clusters,
 180                                             first_new_cluster,
 181                                             cl_cpg, old_bg_clusters, 0);
 182                 le16_add_cpu(&group->bg_free_bits_count, backups);
 183                 le16_add_cpu(&group->bg_bits, -1 * num_bits);
 184                 le16_add_cpu(&group->bg_free_bits_count, -1 * num_bits);
 185         }
 186 out:
 187         if (ret)
 188                 mlog_errno(ret);
 189         return ret;
 190 }
 191
 192 static int update_backups(struct inode * inode, u32 clusters, char *data)
 193 {
 194         int i, ret = 0;
 195         u32 cluster;
 196         u64 blkno;
 197         struct buffer_head *backup = NULL;
 198         struct ocfs2_dinode *backup_di = NULL;
 199         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 200
 201         /* calculate the real backups we need to update. */
 202         for (i = 0; i < OCFS2_MAX_BACKUP_SUPERBLOCKS; i++) {
 203                 blkno = ocfs2_backup_super_blkno(inode->i_sb, i);
 204                 cluster = ocfs2_blocks_to_clusters(inode->i_sb, blkno);
 205                 if (cluster > clusters)
 206                         break;
 207
 208                 ret = ocfs2_read_blocks_sync(osb, blkno, 1, &backup);
 209                 if (ret < 0) {
 210                         mlog_errno(ret);
 211                         break;
 212                 }
 213
 214                 memcpy(backup->b_data, data, inode->i_sb->s_blocksize);
 215
 216                 backup_di = (struct ocfs2_dinode *)backup->b_data;
 217                 backup_di->i_blkno = cpu_to_le64(blkno);
 218
 219                 ret = ocfs2_write_super_or_backup(osb, backup);
 220                 brelse(backup);
 221                 backup = NULL;
 222                 if (ret < 0) {
 223                         mlog_errno(ret);
 224                         break;
 225                 }
 226         }
 227
 228         return ret;
 229 }
 230
 231 static void ocfs2_update_super_and_backups(struct inode *inode,
 232                                            int new_clusters)
 233 {
 234         int ret;
 235         u32 clusters = 0;
 236         struct buffer_head *super_bh = NULL;
 237         struct ocfs2_dinode *super_di = NULL;
 238         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 239
 240         /*
 241          * update the superblock last.
 242          * It doesn't matter if the write failed.
 243          */
 244         ret = ocfs2_read_blocks_sync(osb, OCFS2_SUPER_BLOCK_BLKNO, 1,
 245                                      &super_bh);
 246         if (ret < 0) {
 247                 mlog_errno(ret);
 248                 goto out;
 249         }
 250
 251         super_di = (struct ocfs2_dinode *)super_bh->b_data;
 252         le32_add_cpu(&super_di->i_clusters, new_clusters);
 253         clusters = le32_to_cpu(super_di->i_clusters);
 254
 255         ret = ocfs2_write_super_or_backup(osb, super_bh);
 256         if (ret < 0) {
 257                 mlog_errno(ret);
 258                 goto out;
 259         }
 260
 261         if (OCFS2_HAS_COMPAT_FEATURE(osb->sb, OCFS2_FEATURE_COMPAT_BACKUP_SB))
 262                 ret = update_backups(inode, clusters, super_bh->b_data);
 263
 264 out:
 265         brelse(super_bh);
 266         if (ret)
 267                 printk(KERN_WARNING "ocfs2: Failed to update super blocks on %s"
 268                         " during fs resize. This condition is not fatal,"
 269                         " but fsck.ocfs2 should be run to fix it\n",
 270                         osb->dev_str);
 271         return;
 272 }
 273
 274 /*
 275  * Extend the filesystem to the new number of clusters specified.  This entry
 276  * point is only used to extend the current filesystem to the end of the last
 277  * existing group.
 278  */
 279 int ocfs2_group_extend(struct inode * inode, int new_clusters)
 280 {
 281         int ret;
 282         handle_t *handle;
 283         struct buffer_head *main_bm_bh = NULL;
 284         struct buffer_head *group_bh = NULL;
 285         struct inode *main_bm_inode = NULL;
 286         struct ocfs2_dinode *fe = NULL;
 287         struct ocfs2_group_desc *group = NULL;
 288         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 289         u16 cl_bpc;
 290         u32 first_new_cluster;
 291         u64 lgd_blkno;
 292
 293         if (ocfs2_is_hard_readonly(osb) || ocfs2_is_soft_readonly(osb))
 294                 return -EROFS;
 295
 296         if (new_clusters < 0)
 297                 return -EINVAL;
 298         else if (new_clusters == 0)
 299                 return 0;
 300
 301         main_bm_inode = ocfs2_get_system_file_inode(osb,
 302                                                     GLOBAL_BITMAP_SYSTEM_INODE,
 303                                                     OCFS2_INVALID_SLOT);
 304         if (!main_bm_inode) {
 305                 ret = -EINVAL;
 306                 mlog_errno(ret);
 307                 goto out;
 308         }
 309
 310         mutex_lock(&main_bm_inode->i_mutex);
 311
 312         ret = ocfs2_inode_lock(main_bm_inode, &main_bm_bh, 1);
 313         if (ret < 0) {
 314                 mlog_errno(ret);
 315                 goto out_mutex;
 316         }
 317
 318         fe = (struct ocfs2_dinode *)main_bm_bh->b_data;
 319
 320         /* main_bm_bh is validated by inode read inside ocfs2_inode_lock(),
 321          * so any corruption is a code bug. */
 322         BUG_ON(!OCFS2_IS_VALID_DINODE(fe));
 323
 324         if (le16_to_cpu(fe->id2.i_chain.cl_cpg) !=
 325                 ocfs2_group_bitmap_size(osb->sb, 0,
 326                                         osb->s_feature_incompat) * 8) {
 327                 mlog(ML_ERROR, "The disk is too old and small. "
 328                      "Force to do offline resize.");
 329                 ret = -EINVAL;
 330                 goto out_unlock;
 331         }
 332
 333         first_new_cluster = le32_to_cpu(fe->i_clusters);
 334         lgd_blkno = ocfs2_which_cluster_group(main_bm_inode,
 335                                               first_new_cluster - 1);
 336
 337         ret = ocfs2_read_group_descriptor(main_bm_inode, fe, lgd_blkno,
 338                                           &group_bh);
 339         if (ret < 0) {
 340                 mlog_errno(ret);
 341                 goto out_unlock;
 342         }
 343         group = (struct ocfs2_group_desc *)group_bh->b_data;
 344
 345         cl_bpc = le16_to_cpu(fe->id2.i_chain.cl_bpc);
 346         if (le16_to_cpu(group->bg_bits) / cl_bpc + new_clusters >
 347                 le16_to_cpu(fe->id2.i_chain.cl_cpg)) {
 348                 ret = -EINVAL;
 349                 goto out_unlock;
 350         }
 351
 352
 353         trace_ocfs2_group_extend(
 354              (unsigned long long)le64_to_cpu(group->bg_blkno), new_clusters);
 355
 356         handle = ocfs2_start_trans(osb, OCFS2_GROUP_EXTEND_CREDITS);
 357         if (IS_ERR(handle)) {
 358                 mlog_errno(PTR_ERR(handle));
 359                 ret = -EINVAL;
 360                 goto out_unlock;
 361         }
 362
 363         /* update the last group descriptor and inode. */
 364         ret = ocfs2_update_last_group_and_inode(handle, main_bm_inode,
 365                                                 main_bm_bh, group_bh,
 366                                                 first_new_cluster,
 367                                                 new_clusters);
 368         if (ret) {
 369                 mlog_errno(ret);
 370                 goto out_commit;
 371         }
 372
 373         ocfs2_update_super_and_backups(main_bm_inode, new_clusters);
 374
 375 out_commit:
 376         ocfs2_commit_trans(osb, handle);
 377 out_unlock:
 378         brelse(group_bh);
 379         brelse(main_bm_bh);
 380
 381         ocfs2_inode_unlock(main_bm_inode, 1);
 382
 383 out_mutex:
 384         mutex_unlock(&main_bm_inode->i_mutex);
 385         iput(main_bm_inode);
 386
 387 out:
 388         return ret;
 389 }
 390
 391 static int ocfs2_check_new_group(struct inode *inode,
 392                                  struct ocfs2_dinode *di,
 393                                  struct ocfs2_new_group_input *input,
 394                                  struct buffer_head *group_bh)
 395 {
 396         int ret;
 397         struct ocfs2_group_desc *gd =
 398                 (struct ocfs2_group_desc *)group_bh->b_data;
 399         u16 cl_bpc = le16_to_cpu(di->id2.i_chain.cl_bpc);
 400
 401         ret = ocfs2_check_group_descriptor(inode->i_sb, di, group_bh);
 402         if (ret)
 403                 goto out;
 404
 405         ret = -EINVAL;
 406         if (le16_to_cpu(gd->bg_chain) != input->chain)
 407                 mlog(ML_ERROR, "Group descriptor # %llu has bad chain %u "
 408                      "while input has %u set.\n",
 409                      (unsigned long long)le64_to_cpu(gd->bg_blkno),
 410                      le16_to_cpu(gd->bg_chain), input->chain);
 411         else if (le16_to_cpu(gd->bg_bits) != input->clusters * cl_bpc)
 412                 mlog(ML_ERROR, "Group descriptor # %llu has bit count %u but "
 413                      "input has %u clusters set\n",
 414                      (unsigned long long)le64_to_cpu(gd->bg_blkno),
 415                      le16_to_cpu(gd->bg_bits), input->clusters);
 416         else if (le16_to_cpu(gd->bg_free_bits_count) != input->frees * cl_bpc)
 417                 mlog(ML_ERROR, "Group descriptor # %llu has free bit count %u "
 418                      "but it should have %u set\n",
 419                      (unsigned long long)le64_to_cpu(gd->bg_blkno),
 420                      le16_to_cpu(gd->bg_bits),
 421                      input->frees * cl_bpc);
 422         else
 423                 ret = 0;
 424
 425 out:
 426         return ret;
 427 }
 428
 429 static int ocfs2_verify_group_and_input(struct inode *inode,
 430                                         struct ocfs2_dinode *di,
 431                                         struct ocfs2_new_group_input *input,
 432                                         struct buffer_head *group_bh)
 433 {
 434         u16 cl_count = le16_to_cpu(di->id2.i_chain.cl_count);
 435         u16 cl_cpg = le16_to_cpu(di->id2.i_chain.cl_cpg);
 436         u16 next_free = le16_to_cpu(di->id2.i_chain.cl_next_free_rec);
 437         u32 cluster = ocfs2_blocks_to_clusters(inode->i_sb, input->group);
 438         u32 total_clusters = le32_to_cpu(di->i_clusters);
 439         int ret = -EINVAL;
 440
 441         if (cluster < total_clusters)
 442                 mlog(ML_ERROR, "add a group which is in the current volume.\n");
 443         else if (input->chain >= cl_count)
 444                 mlog(ML_ERROR, "input chain exceeds the limit.\n");
 445         else if (next_free != cl_count && next_free != input->chain)
 446                 mlog(ML_ERROR,
 447                      "the add group should be in chain %u\n", next_free);
 448         else if (total_clusters + input->clusters < total_clusters)
 449                 mlog(ML_ERROR, "add group's clusters overflow.\n");
 450         else if (input->clusters > cl_cpg)
 451                 mlog(ML_ERROR, "the cluster exceeds the maximum of a group\n");
 452         else if (input->frees > input->clusters)
 453                 mlog(ML_ERROR, "the free cluster exceeds the total clusters\n");
 454         else if (total_clusters % cl_cpg != 0)
 455                 mlog(ML_ERROR,
 456                      "the last group isn't full. Use group extend first.\n");
 457         else if (input->group != ocfs2_which_cluster_group(inode, cluster))
 458                 mlog(ML_ERROR, "group blkno is invalid\n");
 459         else if ((ret = ocfs2_check_new_group(inode, di, input, group_bh)))
 460                 mlog(ML_ERROR, "group descriptor check failed.\n");
 461         else
 462                 ret = 0;
 463
 464         return ret;
 465 }
 466
 467 /* Add a new group descriptor to global_bitmap. */
 468 int ocfs2_group_add(struct inode *inode, struct ocfs2_new_group_input *input)
 469 {
 470         int ret;
 471         handle_t *handle;
 472         struct buffer_head *main_bm_bh = NULL;
 473         struct inode *main_bm_inode = NULL;
 474         struct ocfs2_dinode *fe = NULL;
 475         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 476         struct buffer_head *group_bh = NULL;
 477         struct ocfs2_group_desc *group = NULL;
 478         struct ocfs2_chain_list *cl;
 479         struct ocfs2_chain_rec *cr;
 480         u16 cl_bpc;
 481
 482         if (ocfs2_is_hard_readonly(osb) || ocfs2_is_soft_readonly(osb))
 483                 return -EROFS;
 484
 485         main_bm_inode = ocfs2_get_system_file_inode(osb,
 486                                                     GLOBAL_BITMAP_SYSTEM_INODE,
 487                                                     OCFS2_INVALID_SLOT);
 488         if (!main_bm_inode) {
 489                 ret = -EINVAL;
 490                 mlog_errno(ret);
 491                 goto out;
 492         }
 493
 494         mutex_lock(&main_bm_inode->i_mutex);
 495
 496         ret = ocfs2_inode_lock(main_bm_inode, &main_bm_bh, 1);
 497         if (ret < 0) {
 498                 mlog_errno(ret);
 499                 goto out_mutex;
 500         }
 501
 502         fe = (struct ocfs2_dinode *)main_bm_bh->b_data;
 503
 504         if (le16_to_cpu(fe->id2.i_chain.cl_cpg) !=
 505                 ocfs2_group_bitmap_size(osb->sb, 0,
 506                                         osb->s_feature_incompat) * 8) {
 507                 mlog(ML_ERROR, "The disk is too old and small."
 508                      " Force to do offline resize.");
 509                 ret = -EINVAL;
 510                 goto out_unlock;
 511         }
 512
 513         ret = ocfs2_read_blocks_sync(osb, input->group, 1, &group_bh);
 514         if (ret < 0) {
 515                 mlog(ML_ERROR, "Can't read the group descriptor # %llu "
 516                      "from the device.", (unsigned long long)input->group);
 517                 goto out_unlock;
 518         }
 519
 520         ocfs2_set_new_buffer_uptodate(INODE_CACHE(inode), group_bh);
 521
 522         ret = ocfs2_verify_group_and_input(main_bm_inode, fe, input, group_bh);
 523         if (ret) {
 524                 mlog_errno(ret);
 525                 goto out_unlock;
 526         }
 527
 528         trace_ocfs2_group_add((unsigned long long)input->group,
 529                                input->chain, input->clusters, input->frees);
 530
 531         handle = ocfs2_start_trans(osb, OCFS2_GROUP_ADD_CREDITS);
 532         if (IS_ERR(handle)) {
 533                 mlog_errno(PTR_ERR(handle));
 534                 ret = -EINVAL;
 535                 goto out_unlock;
 536         }
 537
 538         cl_bpc = le16_to_cpu(fe->id2.i_chain.cl_bpc);
 539         cl = &fe->id2.i_chain;
 540         cr = &cl->cl_recs[input->chain];
 541
 542         ret = ocfs2_journal_access_gd(handle, INODE_CACHE(main_bm_inode),
 543                                       group_bh, OCFS2_JOURNAL_ACCESS_WRITE);
 544         if (ret < 0) {
 545                 mlog_errno(ret);
 546                 goto out_commit;
 547         }
 548
 549         group = (struct ocfs2_group_desc *)group_bh->b_data;
 550         group->bg_next_group = cr->c_blkno;
 551         ocfs2_journal_dirty(handle, group_bh);
 552
 553         ret = ocfs2_journal_access_di(handle, INODE_CACHE(main_bm_inode),
 554                                       main_bm_bh, OCFS2_JOURNAL_ACCESS_WRITE);
 555         if (ret < 0) {
 556                 mlog_errno(ret);
 557                 goto out_commit;
 558         }
 559
 560         if (input->chain == le16_to_cpu(cl->cl_next_free_rec)) {
 561                 le16_add_cpu(&cl->cl_next_free_rec, 1);
 562                 memset(cr, 0, sizeof(struct ocfs2_chain_rec));
 563         }
 564
 565         cr->c_blkno = cpu_to_le64(input->group);
 566         le32_add_cpu(&cr->c_total, input->clusters * cl_bpc);
 567         le32_add_cpu(&cr->c_free, input->frees * cl_bpc);
 568
 569         le32_add_cpu(&fe->id1.bitmap1.i_total, input->clusters *cl_bpc);
 570         le32_add_cpu(&fe->id1.bitmap1.i_used,
 571                      (input->clusters - input->frees) * cl_bpc);
 572         le32_add_cpu(&fe->i_clusters, input->clusters);
 573
 574         ocfs2_journal_dirty(handle, main_bm_bh);
 575
 576         spin_lock(&OCFS2_I(main_bm_inode)->ip_lock);
 577         OCFS2_I(main_bm_inode)->ip_clusters = le32_to_cpu(fe->i_clusters);
 578         le64_add_cpu(&fe->i_size, input->clusters << osb->s_clustersize_bits);
 579         spin_unlock(&OCFS2_I(main_bm_inode)->ip_lock);
 580         i_size_write(main_bm_inode, le64_to_cpu(fe->i_size));
 581
 582         ocfs2_update_super_and_backups(main_bm_inode, input->clusters);
 583
 584 out_commit:
 585         ocfs2_commit_trans(osb, handle);
 586 out_unlock:
 587         brelse(group_bh);
 588         brelse(main_bm_bh);
 589
 590         ocfs2_inode_unlock(main_bm_inode, 1);
 591
 592 out_mutex:
 593         mutex_unlock(&main_bm_inode->i_mutex);
 594         iput(main_bm_inode);
 595
 596 out:
 597         return ret;
 598 }