fs/ext2/ialloc.c

   1 /*
   2  *  linux/fs/ext2/ialloc.c
   3  *
   4  * Copyright (C) 1992, 1993, 1994, 1995
   5  * Remy Card (card@masi.ibp.fr)
   6  * Laboratoire MASI - Institut Blaise Pascal
   7  * Universite Pierre et Marie Curie (Paris VI)
   8  *
   9  *  BSD ufs-inspired inode and directory allocation by
  10  *  Stephen Tweedie (sct@dcs.ed.ac.uk), 1993
  11  *  Big-endian to little-endian byte-swapping/bitmaps by
  12  *        David S. Miller (davem@caip.rutgers.edu), 1995
  13  */
  14
  15 /*
  16  * ialloc.c contains the inodes allocation and deallocation routines
  17  */
  18
  19 /*
  20  * The free inodes are managed by bitmaps.  A file system contains several
  21  * blocks groups.  Each group contains 1 bitmap block for blocks, 1 bitmap
  22  * block for inodes, N blocks for the inode table and data blocks.
  23  *
  24  * The file system contains group descriptors which are located after the
  25  * super block.  Each descriptor contains the number of the bitmap block and
  26  * the free blocks count in the block.  The descriptors are loaded in memory
  27  * when a file system is mounted (see ext2_read_super).
  28  */
  29
  30 #include <linux/fs.h>
  31 #include <linux/ext2_fs.h>
  32 #include <linux/sched.h>
  33 #include <linux/stat.h>
  34 #include <linux/string.h>
  35 #include <linux/locks.h>
  36 #include <linux/quotaops.h>
  37
  38 #include <asm/bitops.h>
  39 #include <asm/byteorder.h>
  40
  41 /*
  42  * Read the inode allocation bitmap for a given block_group, reading
  43  * into the specified slot in the superblock's bitmap cache.
  44  *
  45  * Return >=0 on success or a -ve error code.
  46  */
  47 static int read_inode_bitmap (struct super_block * sb,
  48                                unsigned long block_group,
  49                                unsigned int bitmap_nr)
  50 {
  51         struct ext2_group_desc * gdp;
  52         struct buffer_head * bh = NULL;
  53         int retval = 0;
  54
  55         gdp = ext2_get_group_desc (sb, block_group, NULL);
  56         if (!gdp) {
  57                 retval = -EIO;
  58                 goto error_out;
  59         }
  60         bh = bread (sb->s_dev, le32_to_cpu(gdp->bg_inode_bitmap), sb->s_blocksize);
  61         if (!bh) {
  62                 ext2_error (sb, "read_inode_bitmap",
  63                             "Cannot read inode bitmap - "
  64                             "block_group = %lu, inode_bitmap = %lu",
  65                             block_group, (unsigned long) gdp->bg_inode_bitmap);
  66                 retval = -EIO;
  67         }
  68         /*
  69          * On IO error, just leave a zero in the superblock's block pointer for
  70          * this group.  The IO will be retried next time.
  71          */
  72 error_out:
  73         sb->u.ext2_sb.s_inode_bitmap_number[bitmap_nr] = block_group;
  74         sb->u.ext2_sb.s_inode_bitmap[bitmap_nr] = bh;
  75         return retval;
  76 }
  77
  78 /*
  79  * load_inode_bitmap loads the inode bitmap for a blocks group
  80  *
  81  * It maintains a cache for the last bitmaps loaded.  This cache is managed
  82  * with a LRU algorithm.
  83  *
  84  * Notes:
  85  * 1/ There is one cache per mounted file system.
  86  * 2/ If the file system contains less than EXT2_MAX_GROUP_LOADED groups,
  87  *    this function reads the bitmap without maintaining a LRU cache.
  88  *
  89  * Return the slot used to store the bitmap, or a -ve error code.
  90  */
  91 static int load_inode_bitmap (struct super_block * sb,
  92                               unsigned int block_group)
  93 {
  94         int i, j, retval = 0;
  95         unsigned long inode_bitmap_number;
  96         struct buffer_head * inode_bitmap;
  97
  98         if (block_group >= sb->u.ext2_sb.s_groups_count)
  99                 ext2_panic (sb, "load_inode_bitmap",
 100                             "block_group >= groups_count - "
 101                             "block_group = %d, groups_count = %lu",
 102                              block_group, sb->u.ext2_sb.s_groups_count);
 103         if (sb->u.ext2_sb.s_loaded_inode_bitmaps > 0 &&
 104             sb->u.ext2_sb.s_inode_bitmap_number[0] == block_group &&
 105             sb->u.ext2_sb.s_inode_bitmap[0] != NULL)
 106                 return 0;
 107         if (sb->u.ext2_sb.s_groups_count <= EXT2_MAX_GROUP_LOADED) {
 108                 if (sb->u.ext2_sb.s_inode_bitmap[block_group]) {
 109                         if (sb->u.ext2_sb.s_inode_bitmap_number[block_group] != block_group)
 110                                 ext2_panic (sb, "load_inode_bitmap",
 111                                             "block_group != inode_bitmap_number");
 112                         else
 113                                 return block_group;
 114                 } else {
 115                         retval = read_inode_bitmap (sb, block_group,
 116                                                     block_group);
 117                         if (retval < 0)
 118                                 return retval;
 119                         return block_group;
 120                 }
 121         }
 122
 123         for (i = 0; i < sb->u.ext2_sb.s_loaded_inode_bitmaps &&
 124                     sb->u.ext2_sb.s_inode_bitmap_number[i] != block_group;
 125              i++)
 126                 ;
 127         if (i < sb->u.ext2_sb.s_loaded_inode_bitmaps &&
 128             sb->u.ext2_sb.s_inode_bitmap_number[i] == block_group) {
 129                 inode_bitmap_number = sb->u.ext2_sb.s_inode_bitmap_number[i];
 130                 inode_bitmap = sb->u.ext2_sb.s_inode_bitmap[i];
 131                 for (j = i; j > 0; j--) {
 132                         sb->u.ext2_sb.s_inode_bitmap_number[j] =
 133                                 sb->u.ext2_sb.s_inode_bitmap_number[j - 1];
 134                         sb->u.ext2_sb.s_inode_bitmap[j] =
 135                                 sb->u.ext2_sb.s_inode_bitmap[j - 1];
 136                 }
 137                 sb->u.ext2_sb.s_inode_bitmap_number[0] = inode_bitmap_number;
 138                 sb->u.ext2_sb.s_inode_bitmap[0] = inode_bitmap;
 139
 140                 /*
 141                  * There's still one special case here --- if inode_bitmap == 0
 142                  * then our last attempt to read the bitmap failed and we have
 143                  * just ended up caching that failure.  Try again to read it.
 144                  */
 145                 if (!inode_bitmap)
 146                         retval = read_inode_bitmap (sb, block_group, 0);
 147
 148         } else {
 149                 if (sb->u.ext2_sb.s_loaded_inode_bitmaps < EXT2_MAX_GROUP_LOADED)
 150                         sb->u.ext2_sb.s_loaded_inode_bitmaps++;
 151                 else
 152                         brelse (sb->u.ext2_sb.s_inode_bitmap[EXT2_MAX_GROUP_LOADED - 1]);
 153                 for (j = sb->u.ext2_sb.s_loaded_inode_bitmaps - 1; j > 0; j--) {
 154                         sb->u.ext2_sb.s_inode_bitmap_number[j] =
 155                                 sb->u.ext2_sb.s_inode_bitmap_number[j - 1];
 156                         sb->u.ext2_sb.s_inode_bitmap[j] =
 157                                 sb->u.ext2_sb.s_inode_bitmap[j - 1];
 158                 }
 159                 retval = read_inode_bitmap (sb, block_group, 0);
 160         }
 161         return retval;
 162 }
 163
 164 /*
 165  * NOTE! When we get the inode, we're the only people
 166  * that have access to it, and as such there are no
 167  * race conditions we have to worry about. The inode
 168  * is not on the hash-lists, and it cannot be reached
 169  * through the filesystem because the directory entry
 170  * has been deleted earlier.
 171  *
 172  * HOWEVER: we must make sure that we get no aliases,
 173  * which means that we have to call "clear_inode()"
 174  * _before_ we mark the inode not in use in the inode
 175  * bitmaps. Otherwise a newly created file might use
 176  * the same inode number (not actually the same pointer
 177  * though), and then we'd have two inodes sharing the
 178  * same inode number and space on the harddisk.
 179  */
 180 void ext2_free_inode (struct inode * inode)
 181 {
 182         struct super_block * sb = inode->i_sb;
 183         int is_directory;
 184         unsigned long ino;
 185         struct buffer_head * bh;
 186         struct buffer_head * bh2;
 187         unsigned long block_group;
 188         unsigned long bit;
 189         int bitmap_nr;
 190         struct ext2_group_desc * gdp;
 191         struct ext2_super_block * es;
 192
 193         if (!inode->i_dev) {
 194                 printk ("ext2_free_inode: inode has no device\n");
 195                 return;
 196         }
 197         if (inode->i_count > 1) {
 198                 printk ("ext2_free_inode: inode has count=%d\n", inode->i_count);
 199                 return;
 200         }
 201         if (inode->i_nlink) {
 202                 printk ("ext2_free_inode: inode has nlink=%d\n",
 203                         inode->i_nlink);
 204                 return;
 205         }
 206         if (!sb) {
 207                 printk("ext2_free_inode: inode on nonexistent device\n");
 208                 return;
 209         }
 210
 211         ino = inode->i_ino;
 212         ext2_debug ("freeing inode %lu\n", ino);
 213
 214         /*
 215          * Note: we must free any quota before locking the superblock,
 216          * as writing the quota to disk may need the lock as well.
 217          */
 218         DQUOT_FREE_INODE(sb, inode);
 219         DQUOT_DROP(inode);
 220
 221         lock_super (sb);
 222         es = sb->u.ext2_sb.s_es;
 223         if (ino < EXT2_FIRST_INO(sb) ||
 224             ino > le32_to_cpu(es->s_inodes_count)) {
 225                 ext2_error (sb, "free_inode",
 226                             "reserved inode or nonexistent inode");
 227                 goto error_return;
 228         }
 229         block_group = (ino - 1) / EXT2_INODES_PER_GROUP(sb);
 230         bit = (ino - 1) % EXT2_INODES_PER_GROUP(sb);
 231         bitmap_nr = load_inode_bitmap (sb, block_group);
 232         if (bitmap_nr < 0)
 233                 goto error_return;
 234
 235         bh = sb->u.ext2_sb.s_inode_bitmap[bitmap_nr];
 236
 237         is_directory = S_ISDIR(inode->i_mode);
 238
 239         /* Do this BEFORE marking the inode not in use */
 240         clear_inode (inode);
 241
 242         /* Ok, now we can actually update the inode bitmaps.. */
 243         if (!ext2_clear_bit (bit, bh->b_data))
 244                 ext2_warning (sb, "ext2_free_inode",
 245                               "bit already cleared for inode %lu", ino);
 246         else {
 247                 gdp = ext2_get_group_desc (sb, block_group, &bh2);
 248                 if (gdp) {
 249                         gdp->bg_free_inodes_count =
 250                                 cpu_to_le16(le16_to_cpu(gdp->bg_free_inodes_count) + 1);
 251                         if (is_directory)
 252                                 gdp->bg_used_dirs_count =
 253                                         cpu_to_le16(le16_to_cpu(gdp->bg_used_dirs_count) - 1);
 254                 }
 255                 mark_buffer_dirty(bh2, 1);
 256                 es->s_free_inodes_count =
 257                         cpu_to_le32(le32_to_cpu(es->s_free_inodes_count) + 1);
 258                 mark_buffer_dirty(sb->u.ext2_sb.s_sbh, 1);
 259         }
 260         mark_buffer_dirty(bh, 1);
 261         if (sb->s_flags & MS_SYNCHRONOUS) {
 262                 ll_rw_block (WRITE, 1, &bh);
 263                 wait_on_buffer (bh);
 264         }
 265         sb->s_dirt = 1;
 266 error_return:
 267         unlock_super (sb);
 268 }
 269
 270 /*
 271  * This function increments the inode version number
 272  *
 273  * This may be used one day by the NFS server
 274  */
 275 static void inc_inode_version (struct inode * inode,
 276                                struct ext2_group_desc *gdp,
 277                                int mode)
 278 {
 279         inode->u.ext2_i.i_version++;
 280         mark_inode_dirty(inode);
 281
 282         return;
 283 }
 284
 285 /*
 286  * There are two policies for allocating an inode.  If the new inode is
 287  * a directory, then a forward search is made for a block group with both
 288  * free space and a low directory-to-inode ratio; if that fails, then of
 289  * the groups with above-average free space, that group with the fewest
 290  * directories already is chosen.
 291  *
 292  * For other inodes, search forward from the parent directory\'s block
 293  * group to find a free inode.
 294  */
 295 struct inode * ext2_new_inode (const struct inode * dir, int mode, int * err)
 296 {
 297         struct super_block * sb;
 298         struct buffer_head * bh;
 299         struct buffer_head * bh2;
 300         int i, j, avefreei;
 301         struct inode * inode;
 302         int bitmap_nr;
 303         struct ext2_group_desc * gdp;
 304         struct ext2_group_desc * tmp;
 305         struct ext2_super_block * es;
 306
 307         /* Cannot create files in a deleted directory */
 308         if (!dir || !dir->i_nlink) {
 309                 *err = -EPERM;
 310                 return NULL;
 311         }
 312
 313         inode = get_empty_inode ();
 314         if (!inode) {
 315                 *err = -ENOMEM;
 316                 return NULL;
 317         }
 318
 319         sb = dir->i_sb;
 320         inode->i_sb = sb;
 321         inode->i_flags = 0;
 322         lock_super (sb);
 323         es = sb->u.ext2_sb.s_es;
 324 repeat:
 325         gdp = NULL; i=0;
 326
 327         *err = -ENOSPC;
 328         if (S_ISDIR(mode)) {
 329                 avefreei = le32_to_cpu(es->s_free_inodes_count) /
 330                         sb->u.ext2_sb.s_groups_count;
 331 /* I am not yet convinced that this next bit is necessary.
 332                 i = dir->u.ext2_i.i_block_group;
 333                 for (j = 0; j < sb->u.ext2_sb.s_groups_count; j++) {
 334                         tmp = ext2_get_group_desc (sb, i, &bh2);
 335                         if (tmp &&
 336                             (le16_to_cpu(tmp->bg_used_dirs_count) << 8) <
 337                              le16_to_cpu(tmp->bg_free_inodes_count)) {
 338                                 gdp = tmp;
 339                                 break;
 340                         }
 341                         else
 342                         i = ++i % sb->u.ext2_sb.s_groups_count;
 343                 }
 344 */
 345                 if (!gdp) {
 346                         for (j = 0; j < sb->u.ext2_sb.s_groups_count; j++) {
 347                                 tmp = ext2_get_group_desc (sb, j, &bh2);
 348                                 if (tmp &&
 349                                     le16_to_cpu(tmp->bg_free_inodes_count) &&
 350                                     le16_to_cpu(tmp->bg_free_inodes_count) >= avefreei) {
 351                                         if (!gdp ||
 352                                             (le16_to_cpu(tmp->bg_free_blocks_count) >
 353                                              le16_to_cpu(gdp->bg_free_blocks_count))) {
 354                                                 i = j;
 355                                                 gdp = tmp;
 356                                         }
 357                                 }
 358                         }
 359                 }
 360         }
 361         else
 362         {
 363                 /*
 364                  * Try to place the inode in its parent directory
 365                  */
 366                 i = dir->u.ext2_i.i_block_group;
 367                 tmp = ext2_get_group_desc (sb, i, &bh2);
 368                 if (tmp && le16_to_cpu(tmp->bg_free_inodes_count))
 369                         gdp = tmp;
 370                 else
 371                 {
 372                         /*
 373                          * Use a quadratic hash to find a group with a
 374                          * free inode
 375                          */
 376                         for (j = 1; j < sb->u.ext2_sb.s_groups_count; j <<= 1) {
 377                                 i += j;
 378                                 if (i >= sb->u.ext2_sb.s_groups_count)
 379                                         i -= sb->u.ext2_sb.s_groups_count;
 380                                 tmp = ext2_get_group_desc (sb, i, &bh2);
 381                                 if (tmp &&
 382                                     le16_to_cpu(tmp->bg_free_inodes_count)) {
 383                                         gdp = tmp;
 384                                         break;
 385                                 }
 386                         }
 387                 }
 388                 if (!gdp) {
 389                         /*
 390                          * That failed: try linear search for a free inode
 391                          */
 392                         i = dir->u.ext2_i.i_block_group + 1;
 393                         for (j = 2; j < sb->u.ext2_sb.s_groups_count; j++) {
 394                                 if (++i >= sb->u.ext2_sb.s_groups_count)
 395                                         i = 0;
 396                                 tmp = ext2_get_group_desc (sb, i, &bh2);
 397                                 if (tmp &&
 398                                     le16_to_cpu(tmp->bg_free_inodes_count)) {
 399                                         gdp = tmp;
 400                                         break;
 401                                 }
 402                         }
 403                 }
 404         }
 405
 406         if (!gdp) {
 407                 unlock_super (sb);
 408                 iput(inode);
 409                 return NULL;
 410         }
 411         bitmap_nr = load_inode_bitmap (sb, i);
 412         if (bitmap_nr < 0) {
 413                 unlock_super (sb);
 414                 iput(inode);
 415                 *err = -EIO;
 416                 return NULL;
 417         }
 418
 419         bh = sb->u.ext2_sb.s_inode_bitmap[bitmap_nr];
 420         if ((j = ext2_find_first_zero_bit ((unsigned long *) bh->b_data,
 421                                       EXT2_INODES_PER_GROUP(sb))) <
 422             EXT2_INODES_PER_GROUP(sb)) {
 423                 if (ext2_set_bit (j, bh->b_data)) {
 424                         ext2_warning (sb, "ext2_new_inode",
 425                                       "bit already set for inode %d", j);
 426                         goto repeat;
 427                 }
 428                 mark_buffer_dirty(bh, 1);
 429                 if (sb->s_flags & MS_SYNCHRONOUS) {
 430                         ll_rw_block (WRITE, 1, &bh);
 431                         wait_on_buffer (bh);
 432                 }
 433         } else {
 434                 if (le16_to_cpu(gdp->bg_free_inodes_count) != 0) {
 435                         ext2_error (sb, "ext2_new_inode",
 436                                     "Free inodes count corrupted in group %d",
 437                                     i);
 438                         unlock_super (sb);
 439                         iput (inode);
 440                         return NULL;
 441                 }
 442                 goto repeat;
 443         }
 444         j += i * EXT2_INODES_PER_GROUP(sb) + 1;
 445         if (j < EXT2_FIRST_INO(sb) || j > le32_to_cpu(es->s_inodes_count)) {
 446                 ext2_error (sb, "ext2_new_inode",
 447                             "reserved inode or inode > inodes count - "
 448                             "block_group = %d,inode=%d", i, j);
 449                 unlock_super (sb);
 450                 iput (inode);
 451                 return NULL;
 452         }
 453         gdp->bg_free_inodes_count =
 454                 cpu_to_le16(le16_to_cpu(gdp->bg_free_inodes_count) - 1);
 455         if (S_ISDIR(mode))
 456                 gdp->bg_used_dirs_count =
 457                         cpu_to_le16(le16_to_cpu(gdp->bg_used_dirs_count) + 1);
 458         mark_buffer_dirty(bh2, 1);
 459         es->s_free_inodes_count =
 460                 cpu_to_le32(le32_to_cpu(es->s_free_inodes_count) - 1);
 461         mark_buffer_dirty(sb->u.ext2_sb.s_sbh, 1);
 462         sb->s_dirt = 1;
 463         inode->i_mode = mode;
 464         inode->i_sb = sb;
 465         inode->i_nlink = 1;
 466         inode->i_dev = sb->s_dev;
 467         inode->i_uid = current->fsuid;
 468         if (test_opt (sb, GRPID))
 469                 inode->i_gid = dir->i_gid;
 470         else if (dir->i_mode & S_ISGID) {
 471                 inode->i_gid = dir->i_gid;
 472                 if (S_ISDIR(mode))
 473                         mode |= S_ISGID;
 474         } else
 475                 inode->i_gid = current->fsgid;
 476
 477         inode->i_ino = j;
 478         inode->i_blksize = PAGE_SIZE;   /* This is the optimal IO size (for stat), not the fs block size */
 479         inode->i_blocks = 0;
 480         inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
 481         inode->u.ext2_i.i_new_inode = 1;
 482         inode->u.ext2_i.i_flags = dir->u.ext2_i.i_flags;
 483         if (S_ISLNK(mode))
 484                 inode->u.ext2_i.i_flags &= ~(EXT2_IMMUTABLE_FL | EXT2_APPEND_FL);
 485         inode->u.ext2_i.i_faddr = 0;
 486         inode->u.ext2_i.i_frag_no = 0;
 487         inode->u.ext2_i.i_frag_size = 0;
 488         inode->u.ext2_i.i_file_acl = 0;
 489         inode->u.ext2_i.i_dir_acl = 0;
 490         inode->u.ext2_i.i_dtime = 0;
 491         inode->u.ext2_i.i_block_group = i;
 492         inode->i_op = NULL;
 493         if (inode->u.ext2_i.i_flags & EXT2_SYNC_FL)
 494                 inode->i_flags |= MS_SYNCHRONOUS;
 495         insert_inode_hash(inode);
 496         mark_inode_dirty(inode);
 497         inc_inode_version (inode, gdp, mode);
 498
 499         unlock_super (sb);
 500         if(DQUOT_ALLOC_INODE(sb, inode)) {
 501                 sb->dq_op->drop(inode);
 502                 inode->i_nlink = 0;
 503                 iput(inode);
 504                 *err = -EDQUOT;
 505                 return NULL;
 506         }
 507         ext2_debug ("allocating inode %lu\n", inode->i_ino);
 508
 509         *err = 0;
 510         return inode;
 511 }
 512
 513 unsigned long ext2_count_free_inodes (struct super_block * sb)
 514 {
 515 #ifdef EXT2FS_DEBUG
 516         struct ext2_super_block * es;
 517         unsigned long desc_count, bitmap_count, x;
 518         int bitmap_nr;
 519         struct ext2_group_desc * gdp;
 520         int i;
 521
 522         lock_super (sb);
 523         es = sb->u.ext2_sb.s_es;
 524         desc_count = 0;
 525         bitmap_count = 0;
 526         gdp = NULL;
 527         for (i = 0; i < sb->u.ext2_sb.s_groups_count; i++) {
 528                 gdp = ext2_get_group_desc (sb, i, NULL);
 529                 if (!gdp)
 530                         continue;
 531                 desc_count += le16_to_cpu(gdp->bg_free_inodes_count);
 532                 bitmap_nr = load_inode_bitmap (sb, i);
 533                 if (bitmap_nr < 0)
 534                         continue;
 535
 536                 x = ext2_count_free (sb->u.ext2_sb.s_inode_bitmap[bitmap_nr],
 537                                      EXT2_INODES_PER_GROUP(sb) / 8);
 538                 printk ("group %d: stored = %d, counted = %lu\n",
 539                         i, le16_to_cpu(gdp->bg_free_inodes_count), x);
 540                 bitmap_count += x;
 541         }
 542         printk("ext2_count_free_inodes: stored = %lu, computed = %lu, %lu\n",
 543                 le32_to_cpu(es->s_free_inodes_count), desc_count, bitmap_count);
 544         unlock_super (sb);
 545         return desc_count;
 546 #else
 547         return le32_to_cpu(sb->u.ext2_sb.s_es->s_free_inodes_count);
 548 #endif
 549 }
 550
 551 void ext2_check_inodes_bitmap (struct super_block * sb)
 552 {
 553         struct ext2_super_block * es;
 554         unsigned long desc_count, bitmap_count, x;
 555         int bitmap_nr;
 556         struct ext2_group_desc * gdp;
 557         int i;
 558
 559         lock_super (sb);
 560         es = sb->u.ext2_sb.s_es;
 561         desc_count = 0;
 562         bitmap_count = 0;
 563         gdp = NULL;
 564         for (i = 0; i < sb->u.ext2_sb.s_groups_count; i++) {
 565                 gdp = ext2_get_group_desc (sb, i, NULL);
 566                 if (!gdp)
 567                         continue;
 568                 desc_count += le16_to_cpu(gdp->bg_free_inodes_count);
 569                 bitmap_nr = load_inode_bitmap (sb, i);
 570                 if (bitmap_nr < 0)
 571                         continue;
 572
 573                 x = ext2_count_free (sb->u.ext2_sb.s_inode_bitmap[bitmap_nr],
 574                                      EXT2_INODES_PER_GROUP(sb) / 8);
 575                 if (le16_to_cpu(gdp->bg_free_inodes_count) != x)
 576                         ext2_error (sb, "ext2_check_inodes_bitmap",
 577                                     "Wrong free inodes count in group %d, "
 578                                     "stored = %d, counted = %lu", i,
 579                                     le16_to_cpu(gdp->bg_free_inodes_count), x);
 580                 bitmap_count += x;
 581         }
 582         if (le32_to_cpu(es->s_free_inodes_count) != bitmap_count)
 583                 ext2_error (sb, "ext2_check_inodes_bitmap",
 584                             "Wrong free inodes count in super block, "
 585                             "stored = %lu, counted = %lu",
 586                             (unsigned long) le32_to_cpu(es->s_free_inodes_count),
 587                             bitmap_count);
 588         unlock_super (sb);
 589 }