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                                        u16 cl_cpg,
  57                                        u16 old_bg_clusters,
  58                                        int set)
  59 {
  60         int i;
  61         u16 backups = 0;
  62         u32 cluster, lgd_cluster;
  63         u64 blkno, gd_blkno, lgd_blkno = le64_to_cpu(gd->bg_blkno);
  64
  65         for (i = 0; i < OCFS2_MAX_BACKUP_SUPERBLOCKS; i++) {
  66                 blkno = ocfs2_backup_super_blkno(inode->i_sb, i);
  67                 cluster = ocfs2_blocks_to_clusters(inode->i_sb, blkno);
  68
  69                 gd_blkno = ocfs2_which_cluster_group(inode, cluster);
  70                 if (gd_blkno < lgd_blkno)
  71                         continue;
  72                 else if (gd_blkno > lgd_blkno)
  73                         break;
  74
  75                 /* check if already done backup super */
  76                 lgd_cluster = ocfs2_blocks_to_clusters(inode->i_sb, lgd_blkno);
  77                 lgd_cluster += old_bg_clusters;
  78                 if (lgd_cluster >= cluster)
  79                         continue;
  80
  81                 if (set)
  82                         ocfs2_set_bit(cluster % cl_cpg,
  83                                       (unsigned long *)gd->bg_bitmap);
  84                 else
  85                         ocfs2_clear_bit(cluster % cl_cpg,
  86                                         (unsigned long *)gd->bg_bitmap);
  87                 backups++;
  88         }
  89
  90         return backups;
  91 }
  92
  93 static int ocfs2_update_last_group_and_inode(handle_t *handle,
  94                                              struct inode *bm_inode,
  95                                              struct buffer_head *bm_bh,
  96                                              struct buffer_head *group_bh,
  97                                              u32 first_new_cluster,
  98                                              int new_clusters)
  99 {
 100         int ret = 0;
 101         struct ocfs2_super *osb = OCFS2_SB(bm_inode->i_sb);
 102         struct ocfs2_dinode *fe = (struct ocfs2_dinode *) bm_bh->b_data;
 103         struct ocfs2_chain_list *cl = &fe->id2.i_chain;
 104         struct ocfs2_chain_rec *cr;
 105         struct ocfs2_group_desc *group;
 106         u16 chain, num_bits, backups = 0;
 107         u16 cl_bpc = le16_to_cpu(cl->cl_bpc);
 108         u16 cl_cpg = le16_to_cpu(cl->cl_cpg);
 109         u16 old_bg_clusters;
 110
 111         trace_ocfs2_update_last_group_and_inode(new_clusters,
 112                                                 first_new_cluster);
 113
 114         ret = ocfs2_journal_access_gd(handle, INODE_CACHE(bm_inode),
 115                                       group_bh, OCFS2_JOURNAL_ACCESS_WRITE);
 116         if (ret < 0) {
 117                 mlog_errno(ret);
 118                 goto out;
 119         }
 120
 121         group = (struct ocfs2_group_desc *)group_bh->b_data;
 122
 123         old_bg_clusters = le16_to_cpu(group->bg_bits) / cl_bpc;
 124         /* update the group first. */
 125         num_bits = new_clusters * cl_bpc;
 126         le16_add_cpu(&group->bg_bits, num_bits);
 127         le16_add_cpu(&group->bg_free_bits_count, num_bits);
 128
 129         /*
 130          * check whether there are some new backup superblocks exist in
 131          * this group and update the group bitmap accordingly.
 132          */
 133         if (OCFS2_HAS_COMPAT_FEATURE(osb->sb,
 134                                      OCFS2_FEATURE_COMPAT_BACKUP_SB)) {
 135                 backups = ocfs2_calc_new_backup_super(bm_inode,
 136                                                      group,
 137                                                      cl_cpg, old_bg_clusters, 1);
 138                 le16_add_cpu(&group->bg_free_bits_count, -1 * backups);
 139         }
 140
 141         ocfs2_journal_dirty(handle, group_bh);
 142
 143         /* update the inode accordingly. */
 144         ret = ocfs2_journal_access_di(handle, INODE_CACHE(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, (u64)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                                             cl_cpg, old_bg_clusters, 0);
 176                 le16_add_cpu(&group->bg_free_bits_count, backups);
 177                 le16_add_cpu(&group->bg_bits, -1 * num_bits);
 178                 le16_add_cpu(&group->bg_free_bits_count, -1 * num_bits);
 179         }
 180 out:
 181         if (ret)
 182                 mlog_errno(ret);
 183         return ret;
 184 }
 185
 186 static int update_backups(struct inode * inode, u32 clusters, char *data)
 187 {
 188         int i, ret = 0;
 189         u32 cluster;
 190         u64 blkno;
 191         struct buffer_head *backup = NULL;
 192         struct ocfs2_dinode *backup_di = NULL;
 193         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 194
 195         /* calculate the real backups we need to update. */
 196         for (i = 0; i < OCFS2_MAX_BACKUP_SUPERBLOCKS; i++) {
 197                 blkno = ocfs2_backup_super_blkno(inode->i_sb, i);
 198                 cluster = ocfs2_blocks_to_clusters(inode->i_sb, blkno);
 199                 if (cluster > clusters)
 200                         break;
 201
 202                 ret = ocfs2_read_blocks_sync(osb, blkno, 1, &backup);
 203                 if (ret < 0) {
 204                         mlog_errno(ret);
 205                         break;
 206                 }
 207
 208                 memcpy(backup->b_data, data, inode->i_sb->s_blocksize);
 209
 210                 backup_di = (struct ocfs2_dinode *)backup->b_data;
 211                 backup_di->i_blkno = cpu_to_le64(blkno);
 212
 213                 ret = ocfs2_write_super_or_backup(osb, backup);
 214                 brelse(backup);
 215                 backup = NULL;
 216                 if (ret < 0) {
 217                         mlog_errno(ret);
 218                         break;
 219                 }
 220         }
 221
 222         return ret;
 223 }
 224
 225 static void ocfs2_update_super_and_backups(struct inode *inode,
 226                                            int new_clusters)
 227 {
 228         int ret;
 229         u32 clusters = 0;
 230         struct buffer_head *super_bh = NULL;
 231         struct ocfs2_dinode *super_di = NULL;
 232         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 233
 234         /*
 235          * update the superblock last.
 236          * It doesn't matter if the write failed.
 237          */
 238         ret = ocfs2_read_blocks_sync(osb, OCFS2_SUPER_BLOCK_BLKNO, 1,
 239                                      &super_bh);
 240         if (ret < 0) {
 241                 mlog_errno(ret);
 242                 goto out;
 243         }
 244
 245         super_di = (struct ocfs2_dinode *)super_bh->b_data;
 246         le32_add_cpu(&super_di->i_clusters, new_clusters);
 247         clusters = le32_to_cpu(super_di->i_clusters);
 248
 249         ret = ocfs2_write_super_or_backup(osb, super_bh);
 250         if (ret < 0) {
 251                 mlog_errno(ret);
 252                 goto out;
 253         }
 254
 255         if (OCFS2_HAS_COMPAT_FEATURE(osb->sb, OCFS2_FEATURE_COMPAT_BACKUP_SB))
 256                 ret = update_backups(inode, clusters, super_bh->b_data);
 257
 258 out:
 259         brelse(super_bh);
 260         if (ret)
 261                 printk(KERN_WARNING "ocfs2: Failed to update super blocks on %s"
 262                         " during fs resize. This condition is not fatal,"
 263                         " but fsck.ocfs2 should be run to fix it\n",
 264                         osb->dev_str);
 265         return;
 266 }
 267
 268 /*
 269  * Extend the filesystem to the new number of clusters specified.  This entry
 270  * point is only used to extend the current filesystem to the end of the last
 271  * existing group.
 272  */
 273 int ocfs2_group_extend(struct inode * inode, int new_clusters)
 274 {
 275         int ret;
 276         handle_t *handle;
 277         struct buffer_head *main_bm_bh = NULL;
 278         struct buffer_head *group_bh = NULL;
 279         struct inode *main_bm_inode = NULL;
 280         struct ocfs2_dinode *fe = NULL;
 281         struct ocfs2_group_desc *group = NULL;
 282         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 283         u16 cl_bpc;
 284         u32 first_new_cluster;
 285         u64 lgd_blkno;
 286
 287         if (ocfs2_is_hard_readonly(osb) || ocfs2_is_soft_readonly(osb))
 288                 return -EROFS;
 289
 290         if (new_clusters < 0)
 291                 return -EINVAL;
 292         else if (new_clusters == 0)
 293                 return 0;
 294
 295         main_bm_inode = ocfs2_get_system_file_inode(osb,
 296                                                     GLOBAL_BITMAP_SYSTEM_INODE,
 297                                                     OCFS2_INVALID_SLOT);
 298         if (!main_bm_inode) {
 299                 ret = -EINVAL;
 300                 mlog_errno(ret);
 301                 goto out;
 302         }
 303
 304         mutex_lock(&main_bm_inode->i_mutex);
 305
 306         ret = ocfs2_inode_lock(main_bm_inode, &main_bm_bh, 1);
 307         if (ret < 0) {
 308                 mlog_errno(ret);
 309                 goto out_mutex;
 310         }
 311
 312         fe = (struct ocfs2_dinode *)main_bm_bh->b_data;
 313
 314         /* main_bm_bh is validated by inode read inside ocfs2_inode_lock(),
 315          * so any corruption is a code bug. */
 316         BUG_ON(!OCFS2_IS_VALID_DINODE(fe));
 317
 318         if (le16_to_cpu(fe->id2.i_chain.cl_cpg) !=
 319                 ocfs2_group_bitmap_size(osb->sb, 0,
 320                                         osb->s_feature_incompat) * 8) {
 321                 mlog(ML_ERROR, "The disk is too old and small. "
 322                      "Force to do offline resize.");
 323                 ret = -EINVAL;
 324                 goto out_unlock;
 325         }
 326
 327         first_new_cluster = le32_to_cpu(fe->i_clusters);
 328         lgd_blkno = ocfs2_which_cluster_group(main_bm_inode,
 329                                               first_new_cluster - 1);
 330
 331         ret = ocfs2_read_group_descriptor(main_bm_inode, fe, lgd_blkno,
 332                                           &group_bh);
 333         if (ret < 0) {
 334                 mlog_errno(ret);
 335                 goto out_unlock;
 336         }
 337         group = (struct ocfs2_group_desc *)group_bh->b_data;
 338
 339         cl_bpc = le16_to_cpu(fe->id2.i_chain.cl_bpc);
 340         if (le16_to_cpu(group->bg_bits) / cl_bpc + new_clusters >
 341                 le16_to_cpu(fe->id2.i_chain.cl_cpg)) {
 342                 ret = -EINVAL;
 343                 goto out_unlock;
 344         }
 345
 346
 347         trace_ocfs2_group_extend(
 348              (unsigned long long)le64_to_cpu(group->bg_blkno), new_clusters);
 349
 350         handle = ocfs2_start_trans(osb, OCFS2_GROUP_EXTEND_CREDITS);
 351         if (IS_ERR(handle)) {
 352                 mlog_errno(PTR_ERR(handle));
 353                 ret = -EINVAL;
 354                 goto out_unlock;
 355         }
 356
 357         /* update the last group descriptor and inode. */
 358         ret = ocfs2_update_last_group_and_inode(handle, main_bm_inode,
 359                                                 main_bm_bh, group_bh,
 360                                                 first_new_cluster,
 361                                                 new_clusters);
 362         if (ret) {
 363                 mlog_errno(ret);
 364                 goto out_commit;
 365         }
 366
 367         ocfs2_update_super_and_backups(main_bm_inode, new_clusters);
 368
 369 out_commit:
 370         ocfs2_commit_trans(osb, handle);
 371 out_unlock:
 372         brelse(group_bh);
 373         brelse(main_bm_bh);
 374
 375         ocfs2_inode_unlock(main_bm_inode, 1);
 376
 377 out_mutex:
 378         mutex_unlock(&main_bm_inode->i_mutex);
 379         iput(main_bm_inode);
 380
 381 out:
 382         return ret;
 383 }
 384
 385 static int ocfs2_check_new_group(struct inode *inode,
 386                                  struct ocfs2_dinode *di,
 387                                  struct ocfs2_new_group_input *input,
 388                                  struct buffer_head *group_bh)
 389 {
 390         int ret;
 391         struct ocfs2_group_desc *gd =
 392                 (struct ocfs2_group_desc *)group_bh->b_data;
 393         u16 cl_bpc = le16_to_cpu(di->id2.i_chain.cl_bpc);
 394
 395         ret = ocfs2_check_group_descriptor(inode->i_sb, di, group_bh);
 396         if (ret)
 397                 goto out;
 398
 399         ret = -EINVAL;
 400         if (le16_to_cpu(gd->bg_chain) != input->chain)
 401                 mlog(ML_ERROR, "Group descriptor # %llu has bad chain %u "
 402                      "while input has %u set.\n",
 403                      (unsigned long long)le64_to_cpu(gd->bg_blkno),
 404                      le16_to_cpu(gd->bg_chain), input->chain);
 405         else if (le16_to_cpu(gd->bg_bits) != input->clusters * cl_bpc)
 406                 mlog(ML_ERROR, "Group descriptor # %llu has bit count %u but "
 407                      "input has %u clusters set\n",
 408                      (unsigned long long)le64_to_cpu(gd->bg_blkno),
 409                      le16_to_cpu(gd->bg_bits), input->clusters);
 410         else if (le16_to_cpu(gd->bg_free_bits_count) != input->frees * cl_bpc)
 411                 mlog(ML_ERROR, "Group descriptor # %llu has free bit count %u "
 412                      "but it should have %u set\n",
 413                      (unsigned long long)le64_to_cpu(gd->bg_blkno),
 414                      le16_to_cpu(gd->bg_bits),
 415                      input->frees * cl_bpc);
 416         else
 417                 ret = 0;
 418
 419 out:
 420         return ret;
 421 }
 422
 423 static int ocfs2_verify_group_and_input(struct inode *inode,
 424                                         struct ocfs2_dinode *di,
 425                                         struct ocfs2_new_group_input *input,
 426                                         struct buffer_head *group_bh)
 427 {
 428         u16 cl_count = le16_to_cpu(di->id2.i_chain.cl_count);
 429         u16 cl_cpg = le16_to_cpu(di->id2.i_chain.cl_cpg);
 430         u16 next_free = le16_to_cpu(di->id2.i_chain.cl_next_free_rec);
 431         u32 cluster = ocfs2_blocks_to_clusters(inode->i_sb, input->group);
 432         u32 total_clusters = le32_to_cpu(di->i_clusters);
 433         int ret = -EINVAL;
 434
 435         if (cluster < total_clusters)
 436                 mlog(ML_ERROR, "add a group which is in the current volume.\n");
 437         else if (input->chain >= cl_count)
 438                 mlog(ML_ERROR, "input chain exceeds the limit.\n");
 439         else if (next_free != cl_count && next_free != input->chain)
 440                 mlog(ML_ERROR,
 441                      "the add group should be in chain %u\n", next_free);
 442         else if (total_clusters + input->clusters < total_clusters)
 443                 mlog(ML_ERROR, "add group's clusters overflow.\n");
 444         else if (input->clusters > cl_cpg)
 445                 mlog(ML_ERROR, "the cluster exceeds the maximum of a group\n");
 446         else if (input->frees > input->clusters)
 447                 mlog(ML_ERROR, "the free cluster exceeds the total clusters\n");
 448         else if (total_clusters % cl_cpg != 0)
 449                 mlog(ML_ERROR,
 450                      "the last group isn't full. Use group extend first.\n");
 451         else if (input->group != ocfs2_which_cluster_group(inode, cluster))
 452                 mlog(ML_ERROR, "group blkno is invalid\n");
 453         else if ((ret = ocfs2_check_new_group(inode, di, input, group_bh)))
 454                 mlog(ML_ERROR, "group descriptor check failed.\n");
 455         else
 456                 ret = 0;
 457
 458         return ret;
 459 }
 460
 461 /* Add a new group descriptor to global_bitmap. */
 462 int ocfs2_group_add(struct inode *inode, struct ocfs2_new_group_input *input)
 463 {
 464         int ret;
 465         handle_t *handle;
 466         struct buffer_head *main_bm_bh = NULL;
 467         struct inode *main_bm_inode = NULL;
 468         struct ocfs2_dinode *fe = NULL;
 469         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 470         struct buffer_head *group_bh = NULL;
 471         struct ocfs2_group_desc *group = NULL;
 472         struct ocfs2_chain_list *cl;
 473         struct ocfs2_chain_rec *cr;
 474         u16 cl_bpc;
 475         u64 bg_ptr;
 476
 477         if (ocfs2_is_hard_readonly(osb) || ocfs2_is_soft_readonly(osb))
 478                 return -EROFS;
 479
 480         main_bm_inode = ocfs2_get_system_file_inode(osb,
 481                                                     GLOBAL_BITMAP_SYSTEM_INODE,
 482                                                     OCFS2_INVALID_SLOT);
 483         if (!main_bm_inode) {
 484                 ret = -EINVAL;
 485                 mlog_errno(ret);
 486                 goto out;
 487         }
 488
 489         mutex_lock(&main_bm_inode->i_mutex);
 490
 491         ret = ocfs2_inode_lock(main_bm_inode, &main_bm_bh, 1);
 492         if (ret < 0) {
 493                 mlog_errno(ret);
 494                 goto out_mutex;
 495         }
 496
 497         fe = (struct ocfs2_dinode *)main_bm_bh->b_data;
 498
 499         if (le16_to_cpu(fe->id2.i_chain.cl_cpg) !=
 500                 ocfs2_group_bitmap_size(osb->sb, 0,
 501                                         osb->s_feature_incompat) * 8) {
 502                 mlog(ML_ERROR, "The disk is too old and small."
 503                      " Force to do offline resize.");
 504                 ret = -EINVAL;
 505                 goto out_unlock;
 506         }
 507
 508         ret = ocfs2_read_blocks_sync(osb, input->group, 1, &group_bh);
 509         if (ret < 0) {
 510                 mlog(ML_ERROR, "Can't read the group descriptor # %llu "
 511                      "from the device.", (unsigned long long)input->group);
 512                 goto out_unlock;
 513         }
 514
 515         ocfs2_set_new_buffer_uptodate(INODE_CACHE(inode), group_bh);
 516
 517         ret = ocfs2_verify_group_and_input(main_bm_inode, fe, input, group_bh);
 518         if (ret) {
 519                 mlog_errno(ret);
 520                 goto out_free_group_bh;
 521         }
 522
 523         trace_ocfs2_group_add((unsigned long long)input->group,
 524                                input->chain, input->clusters, input->frees);
 525
 526         handle = ocfs2_start_trans(osb, OCFS2_GROUP_ADD_CREDITS);
 527         if (IS_ERR(handle)) {
 528                 mlog_errno(PTR_ERR(handle));
 529                 ret = -EINVAL;
 530                 goto out_free_group_bh;
 531         }
 532
 533         cl_bpc = le16_to_cpu(fe->id2.i_chain.cl_bpc);
 534         cl = &fe->id2.i_chain;
 535         cr = &cl->cl_recs[input->chain];
 536
 537         ret = ocfs2_journal_access_gd(handle, INODE_CACHE(main_bm_inode),
 538                                       group_bh, OCFS2_JOURNAL_ACCESS_WRITE);
 539         if (ret < 0) {
 540                 mlog_errno(ret);
 541                 goto out_commit;
 542         }
 543
 544         group = (struct ocfs2_group_desc *)group_bh->b_data;
 545         bg_ptr = le64_to_cpu(group->bg_next_group);
 546         group->bg_next_group = cr->c_blkno;
 547         ocfs2_journal_dirty(handle, group_bh);
 548
 549         ret = ocfs2_journal_access_di(handle, INODE_CACHE(main_bm_inode),
 550                                       main_bm_bh, OCFS2_JOURNAL_ACCESS_WRITE);
 551         if (ret < 0) {
 552                 group->bg_next_group = cpu_to_le64(bg_ptr);
 553                 mlog_errno(ret);
 554                 goto out_commit;
 555         }
 556
 557         if (input->chain == le16_to_cpu(cl->cl_next_free_rec)) {
 558                 le16_add_cpu(&cl->cl_next_free_rec, 1);
 559                 memset(cr, 0, sizeof(struct ocfs2_chain_rec));
 560         }
 561
 562         cr->c_blkno = cpu_to_le64(input->group);
 563         le32_add_cpu(&cr->c_total, input->clusters * cl_bpc);
 564         le32_add_cpu(&cr->c_free, input->frees * cl_bpc);
 565
 566         le32_add_cpu(&fe->id1.bitmap1.i_total, input->clusters *cl_bpc);
 567         le32_add_cpu(&fe->id1.bitmap1.i_used,
 568                      (input->clusters - input->frees) * cl_bpc);
 569         le32_add_cpu(&fe->i_clusters, input->clusters);
 570
 571         ocfs2_journal_dirty(handle, main_bm_bh);
 572
 573         spin_lock(&OCFS2_I(main_bm_inode)->ip_lock);
 574         OCFS2_I(main_bm_inode)->ip_clusters = le32_to_cpu(fe->i_clusters);
 575         le64_add_cpu(&fe->i_size, (u64)input->clusters << osb->s_clustersize_bits);
 576         spin_unlock(&OCFS2_I(main_bm_inode)->ip_lock);
 577         i_size_write(main_bm_inode, le64_to_cpu(fe->i_size));
 578
 579         ocfs2_update_super_and_backups(main_bm_inode, input->clusters);
 580
 581 out_commit:
 582         ocfs2_commit_trans(osb, handle);
 583
 584 out_free_group_bh:
 585         brelse(group_bh);
 586
 587 out_unlock:
 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 }