fs/ext3/ialloc.c

   1 /*
   2  *  linux/fs/ext3/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@redhat.com), 1993
  11  *  Big-endian to little-endian byte-swapping/bitmaps by
  12  *        David S. Miller (davem@caip.rutgers.edu), 1995
  13  */
  14
  15 #include <linux/sched.h>
  16 #include <linux/fs.h>
  17 #include <linux/jbd.h>
  18 #include <linux/ext3_fs.h>
  19 #include <linux/ext3_jbd.h>
  20 #include <linux/stat.h>
  21 #include <linux/string.h>
  22 #include <linux/locks.h>
  23 #include <linux/quotaops.h>
  24
  25 #include <asm/bitops.h>
  26 #include <asm/byteorder.h>
  27
  28 /*
  29  * ialloc.c contains the inodes allocation and deallocation routines
  30  */
  31
  32 /*
  33  * The free inodes are managed by bitmaps.  A file system contains several
  34  * blocks groups.  Each group contains 1 bitmap block for blocks, 1 bitmap
  35  * block for inodes, N blocks for the inode table and data blocks.
  36  *
  37  * The file system contains group descriptors which are located after the
  38  * super block.  Each descriptor contains the number of the bitmap block and
  39  * the free blocks count in the block.  The descriptors are loaded in memory
  40  * when a file system is mounted (see ext3_read_super).
  41  */
  42
  43
  44 /*
  45  * Read the inode allocation bitmap for a given block_group, reading
  46  * into the specified slot in the superblock's bitmap cache.
  47  *
  48  * Return >=0 on success or a -ve error code.
  49  */
  50 static int read_inode_bitmap (struct super_block * sb,
  51                                unsigned long block_group,
  52                                unsigned int bitmap_nr)
  53 {
  54         struct ext3_group_desc * gdp;
  55         struct buffer_head * bh = NULL;
  56         int retval = 0;
  57
  58         gdp = ext3_get_group_desc (sb, block_group, NULL);
  59         if (!gdp) {
  60                 retval = -EIO;
  61                 goto error_out;
  62         }
  63         bh = sb_bread(sb, le32_to_cpu(gdp->bg_inode_bitmap));
  64         if (!bh) {
  65                 ext3_error (sb, "read_inode_bitmap",
  66                             "Cannot read inode bitmap - "
  67                             "block_group = %lu, inode_bitmap = %u",
  68                             block_group, gdp->bg_inode_bitmap);
  69                 retval = -EIO;
  70         }
  71         /*
  72          * On IO error, just leave a zero in the superblock's block pointer for
  73          * this group.  The IO will be retried next time.
  74          */
  75 error_out:
  76         sb->u.ext3_sb.s_inode_bitmap_number[bitmap_nr] = block_group;
  77         sb->u.ext3_sb.s_inode_bitmap[bitmap_nr] = bh;
  78         return retval;
  79 }
  80
  81 /*
  82  * load_inode_bitmap loads the inode bitmap for a blocks group
  83  *
  84  * It maintains a cache for the last bitmaps loaded.  This cache is managed
  85  * with a LRU algorithm.
  86  *
  87  * Notes:
  88  * 1/ There is one cache per mounted file system.
  89  * 2/ If the file system contains less than EXT3_MAX_GROUP_LOADED groups,
  90  *    this function reads the bitmap without maintaining a LRU cache.
  91  *
  92  * Return the slot used to store the bitmap, or a -ve error code.
  93  */
  94 static int load_inode_bitmap (struct super_block * sb,
  95                               unsigned int block_group)
  96 {
  97         struct ext3_sb_info *sbi = EXT3_SB(sb);
  98         unsigned long inode_bitmap_number;
  99         struct buffer_head * inode_bitmap;
 100         int i, j, retval = 0;
 101
 102         if (block_group >= sbi->s_groups_count)
 103                 ext3_panic (sb, "load_inode_bitmap",
 104                             "block_group >= groups_count - "
 105                             "block_group = %d, groups_count = %lu",
 106                             block_group, sbi->s_groups_count);
 107         if (sbi->s_loaded_inode_bitmaps > 0 &&
 108             sbi->s_inode_bitmap_number[0] == block_group &&
 109             sbi->s_inode_bitmap[0] != NULL)
 110                 return 0;
 111         if (sbi->s_groups_count <= EXT3_MAX_GROUP_LOADED) {
 112                 if (sbi->s_inode_bitmap[block_group]) {
 113                         if (sbi->s_inode_bitmap_number[block_group] !=
 114                                                 block_group)
 115                                 ext3_panic(sb, "load_inode_bitmap",
 116                                         "block_group != inode_bitmap_number");
 117                         return block_group;
 118                 }
 119                 retval = read_inode_bitmap(sb, block_group, block_group);
 120                 if (retval < 0)
 121                         return retval;
 122                 return block_group;
 123         }
 124
 125         for (i = 0; i < sbi->s_loaded_inode_bitmaps &&
 126                     sbi->s_inode_bitmap_number[i] != block_group; i++)
 127                 /* do nothing */;
 128         if (i < sbi->s_loaded_inode_bitmaps &&
 129             sbi->s_inode_bitmap_number[i] == block_group) {
 130                 inode_bitmap_number = sbi->s_inode_bitmap_number[i];
 131                 inode_bitmap = sbi->s_inode_bitmap[i];
 132                 for (j = i; j > 0; j--) {
 133                         sbi->s_inode_bitmap_number[j] =
 134                                 sbi->s_inode_bitmap_number[j - 1];
 135                         sbi->s_inode_bitmap[j] = sbi->s_inode_bitmap[j - 1];
 136                 }
 137                 sbi->s_inode_bitmap_number[0] = inode_bitmap_number;
 138                 sbi->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         } else {
 148                 if (sbi->s_loaded_inode_bitmaps < EXT3_MAX_GROUP_LOADED)
 149                         sbi->s_loaded_inode_bitmaps++;
 150                 else
 151                         brelse(sbi->s_inode_bitmap[EXT3_MAX_GROUP_LOADED - 1]);
 152                 for (j = sbi->s_loaded_inode_bitmaps - 1; j > 0; j--) {
 153                         sbi->s_inode_bitmap_number[j] =
 154                                 sbi->s_inode_bitmap_number[j - 1];
 155                         sbi->s_inode_bitmap[j] = sbi->s_inode_bitmap[j - 1];
 156                 }
 157                 retval = read_inode_bitmap (sb, block_group, 0);
 158         }
 159         return retval;
 160 }
 161
 162 /*
 163  * NOTE! When we get the inode, we're the only people
 164  * that have access to it, and as such there are no
 165  * race conditions we have to worry about. The inode
 166  * is not on the hash-lists, and it cannot be reached
 167  * through the filesystem because the directory entry
 168  * has been deleted earlier.
 169  *
 170  * HOWEVER: we must make sure that we get no aliases,
 171  * which means that we have to call "clear_inode()"
 172  * _before_ we mark the inode not in use in the inode
 173  * bitmaps. Otherwise a newly created file might use
 174  * the same inode number (not actually the same pointer
 175  * though), and then we'd have two inodes sharing the
 176  * same inode number and space on the harddisk.
 177  */
 178 void ext3_free_inode (handle_t *handle, struct inode * inode)
 179 {
 180         struct super_block * sb = inode->i_sb;
 181         int is_directory;
 182         unsigned long ino;
 183         struct buffer_head * bh;
 184         struct buffer_head * bh2;
 185         unsigned long block_group;
 186         unsigned long bit;
 187         int bitmap_nr;
 188         struct ext3_group_desc * gdp;
 189         struct ext3_super_block * es;
 190         int fatal = 0, err;
 191
 192         if (!inode->i_dev) {
 193                 printk ("ext3_free_inode: inode has no device\n");
 194                 return;
 195         }
 196         if (atomic_read(&inode->i_count) > 1) {
 197                 printk ("ext3_free_inode: inode has count=%d\n",
 198                                         atomic_read(&inode->i_count));
 199                 return;
 200         }
 201         if (inode->i_nlink) {
 202                 printk ("ext3_free_inode: inode has nlink=%d\n",
 203                         inode->i_nlink);
 204                 return;
 205         }
 206         if (!sb) {
 207                 printk("ext3_free_inode: inode on nonexistent device\n");
 208                 return;
 209         }
 210
 211         ino = inode->i_ino;
 212         ext3_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_INIT(inode);
 219         DQUOT_FREE_INODE(inode);
 220         DQUOT_DROP(inode);
 221
 222         is_directory = S_ISDIR(inode->i_mode);
 223
 224         /* Do this BEFORE marking the inode not in use or returning an error */
 225         clear_inode (inode);
 226
 227         lock_super (sb);
 228         es = sb->u.ext3_sb.s_es;
 229         if (ino < EXT3_FIRST_INO(sb) || ino > le32_to_cpu(es->s_inodes_count)) {
 230                 ext3_error (sb, "ext3_free_inode",
 231                             "reserved or nonexistent inode %lu", ino);
 232                 goto error_return;
 233         }
 234         block_group = (ino - 1) / EXT3_INODES_PER_GROUP(sb);
 235         bit = (ino - 1) % EXT3_INODES_PER_GROUP(sb);
 236         bitmap_nr = load_inode_bitmap (sb, block_group);
 237         if (bitmap_nr < 0)
 238                 goto error_return;
 239
 240         bh = sb->u.ext3_sb.s_inode_bitmap[bitmap_nr];
 241
 242         BUFFER_TRACE(bh, "get_write_access");
 243         fatal = ext3_journal_get_write_access(handle, bh);
 244         if (fatal)
 245                 goto error_return;
 246
 247         /* Ok, now we can actually update the inode bitmaps.. */
 248         if (!ext3_clear_bit (bit, bh->b_data))
 249                 ext3_error (sb, "ext3_free_inode",
 250                               "bit already cleared for inode %lu", ino);
 251         else {
 252                 gdp = ext3_get_group_desc (sb, block_group, &bh2);
 253
 254                 BUFFER_TRACE(bh2, "get_write_access");
 255                 fatal = ext3_journal_get_write_access(handle, bh2);
 256                 if (fatal) goto error_return;
 257
 258                 BUFFER_TRACE(sb->u.ext3_sb.s_sbh, "get write access");
 259                 fatal = ext3_journal_get_write_access(handle, sb->u.ext3_sb.s_sbh);
 260                 if (fatal) goto error_return;
 261
 262                 if (gdp) {
 263                         gdp->bg_free_inodes_count = cpu_to_le16(
 264                                 le16_to_cpu(gdp->bg_free_inodes_count) + 1);
 265                         if (is_directory)
 266                                 gdp->bg_used_dirs_count = cpu_to_le16(
 267                                   le16_to_cpu(gdp->bg_used_dirs_count) - 1);
 268                 }
 269                 BUFFER_TRACE(bh2, "call ext3_journal_dirty_metadata");
 270                 err = ext3_journal_dirty_metadata(handle, bh2);
 271                 if (!fatal) fatal = err;
 272                 es->s_free_inodes_count =
 273                         cpu_to_le32(le32_to_cpu(es->s_free_inodes_count) + 1);
 274                 BUFFER_TRACE(sb->u.ext3_sb.s_sbh,
 275                                         "call ext3_journal_dirty_metadata");
 276                 err = ext3_journal_dirty_metadata(handle, sb->u.ext3_sb.s_sbh);
 277                 if (!fatal) fatal = err;
 278         }
 279         BUFFER_TRACE(bh, "call ext3_journal_dirty_metadata");
 280         err = ext3_journal_dirty_metadata(handle, bh);
 281         if (!fatal)
 282                 fatal = err;
 283         sb->s_dirt = 1;
 284 error_return:
 285         ext3_std_error(sb, fatal);
 286         unlock_super(sb);
 287 }
 288
 289 /*
 290  * There are two policies for allocating an inode.  If the new inode is
 291  * a directory, then a forward search is made for a block group with both
 292  * free space and a low directory-to-inode ratio; if that fails, then of
 293  * the groups with above-average free space, that group with the fewest
 294  * directories already is chosen.
 295  *
 296  * For other inodes, search forward from the parent directory's block
 297  * group to find a free inode.
 298  */
 299 struct inode * ext3_new_inode (handle_t *handle,
 300                                 const struct inode * dir, int mode)
 301 {
 302         struct super_block * sb;
 303         struct buffer_head * bh;
 304         struct buffer_head * bh2;
 305         int i, j, avefreei;
 306         struct inode * inode;
 307         int bitmap_nr;
 308         struct ext3_group_desc * gdp;
 309         struct ext3_group_desc * tmp;
 310         struct ext3_super_block * es;
 311         int err = 0;
 312
 313         /* Cannot create files in a deleted directory */
 314         if (!dir || !dir->i_nlink)
 315                 return ERR_PTR(-EPERM);
 316
 317         sb = dir->i_sb;
 318         inode = new_inode(sb);
 319         if (!inode)
 320                 return ERR_PTR(-ENOMEM);
 321         init_rwsem(&inode->u.ext3_i.truncate_sem);
 322
 323         lock_super (sb);
 324         es = sb->u.ext3_sb.s_es;
 325 repeat:
 326         gdp = NULL;
 327         i = 0;
 328
 329         if (S_ISDIR(mode)) {
 330                 avefreei = le32_to_cpu(es->s_free_inodes_count) /
 331                         sb->u.ext3_sb.s_groups_count;
 332                 if (!gdp) {
 333                         for (j = 0; j < sb->u.ext3_sb.s_groups_count; j++) {
 334                                 struct buffer_head *temp_buffer;
 335                                 tmp = ext3_get_group_desc (sb, j, &temp_buffer);
 336                                 if (tmp &&
 337                                     le16_to_cpu(tmp->bg_free_inodes_count) &&
 338                                     le16_to_cpu(tmp->bg_free_inodes_count) >=
 339                                                         avefreei) {
 340                                         if (!gdp || (le16_to_cpu(tmp->bg_free_blocks_count) >
 341                                                 le16_to_cpu(gdp->bg_free_blocks_count))) {
 342                                                 i = j;
 343                                                 gdp = tmp;
 344                                                 bh2 = temp_buffer;
 345                                         }
 346                                 }
 347                         }
 348                 }
 349         } else {
 350                 /*
 351                  * Try to place the inode in its parent directory
 352                  */
 353                 i = dir->u.ext3_i.i_block_group;
 354                 tmp = ext3_get_group_desc (sb, i, &bh2);
 355                 if (tmp && le16_to_cpu(tmp->bg_free_inodes_count))
 356                         gdp = tmp;
 357                 else
 358                 {
 359                         /*
 360                          * Use a quadratic hash to find a group with a
 361                          * free inode
 362                          */
 363                         for (j = 1; j < sb->u.ext3_sb.s_groups_count; j <<= 1) {
 364                                 i += j;
 365                                 if (i >= sb->u.ext3_sb.s_groups_count)
 366                                         i -= sb->u.ext3_sb.s_groups_count;
 367                                 tmp = ext3_get_group_desc (sb, i, &bh2);
 368                                 if (tmp &&
 369                                     le16_to_cpu(tmp->bg_free_inodes_count)) {
 370                                         gdp = tmp;
 371                                         break;
 372                                 }
 373                         }
 374                 }
 375                 if (!gdp) {
 376                         /*
 377                          * That failed: try linear search for a free inode
 378                          */
 379                         i = dir->u.ext3_i.i_block_group + 1;
 380                         for (j = 2; j < sb->u.ext3_sb.s_groups_count; j++) {
 381                                 if (++i >= sb->u.ext3_sb.s_groups_count)
 382                                         i = 0;
 383                                 tmp = ext3_get_group_desc (sb, i, &bh2);
 384                                 if (tmp &&
 385                                     le16_to_cpu(tmp->bg_free_inodes_count)) {
 386                                         gdp = tmp;
 387                                         break;
 388                                 }
 389                         }
 390                 }
 391         }
 392
 393         err = -ENOSPC;
 394         if (!gdp)
 395                 goto out;
 396
 397         err = -EIO;
 398         bitmap_nr = load_inode_bitmap (sb, i);
 399         if (bitmap_nr < 0)
 400                 goto fail;
 401
 402         bh = sb->u.ext3_sb.s_inode_bitmap[bitmap_nr];
 403
 404         if ((j = ext3_find_first_zero_bit ((unsigned long *) bh->b_data,
 405                                       EXT3_INODES_PER_GROUP(sb))) <
 406             EXT3_INODES_PER_GROUP(sb)) {
 407                 BUFFER_TRACE(bh, "get_write_access");
 408                 err = ext3_journal_get_write_access(handle, bh);
 409                 if (err) goto fail;
 410
 411                 if (ext3_set_bit (j, bh->b_data)) {
 412                         ext3_error (sb, "ext3_new_inode",
 413                                       "bit already set for inode %d", j);
 414                         goto repeat;
 415                 }
 416                 BUFFER_TRACE(bh, "call ext3_journal_dirty_metadata");
 417                 err = ext3_journal_dirty_metadata(handle, bh);
 418                 if (err) goto fail;
 419         } else {
 420                 if (le16_to_cpu(gdp->bg_free_inodes_count) != 0) {
 421                         ext3_error (sb, "ext3_new_inode",
 422                                     "Free inodes count corrupted in group %d",
 423                                     i);
 424                         /* Is it really ENOSPC? */
 425                         err = -ENOSPC;
 426                         if (sb->s_flags & MS_RDONLY)
 427                                 goto fail;
 428
 429                         BUFFER_TRACE(bh2, "get_write_access");
 430                         err = ext3_journal_get_write_access(handle, bh2);
 431                         if (err) goto fail;
 432                         gdp->bg_free_inodes_count = 0;
 433                         BUFFER_TRACE(bh2, "call ext3_journal_dirty_metadata");
 434                         err = ext3_journal_dirty_metadata(handle, bh2);
 435                         if (err) goto fail;
 436                 }
 437                 goto repeat;
 438         }
 439         j += i * EXT3_INODES_PER_GROUP(sb) + 1;
 440         if (j < EXT3_FIRST_INO(sb) || j > le32_to_cpu(es->s_inodes_count)) {
 441                 ext3_error (sb, "ext3_new_inode",
 442                             "reserved inode or inode > inodes count - "
 443                             "block_group = %d,inode=%d", i, j);
 444                 err = -EIO;
 445                 goto fail;
 446         }
 447
 448         BUFFER_TRACE(bh2, "get_write_access");
 449         err = ext3_journal_get_write_access(handle, bh2);
 450         if (err) goto fail;
 451         gdp->bg_free_inodes_count =
 452                 cpu_to_le16(le16_to_cpu(gdp->bg_free_inodes_count) - 1);
 453         if (S_ISDIR(mode))
 454                 gdp->bg_used_dirs_count =
 455                         cpu_to_le16(le16_to_cpu(gdp->bg_used_dirs_count) + 1);
 456         BUFFER_TRACE(bh2, "call ext3_journal_dirty_metadata");
 457         err = ext3_journal_dirty_metadata(handle, bh2);
 458         if (err) goto fail;
 459
 460         BUFFER_TRACE(sb->u.ext3_sb.s_sbh, "get_write_access");
 461         err = ext3_journal_get_write_access(handle, sb->u.ext3_sb.s_sbh);
 462         if (err) goto fail;
 463         es->s_free_inodes_count =
 464                 cpu_to_le32(le32_to_cpu(es->s_free_inodes_count) - 1);
 465         BUFFER_TRACE(sb->u.ext3_sb.s_sbh, "call ext3_journal_dirty_metadata");
 466         err = ext3_journal_dirty_metadata(handle, sb->u.ext3_sb.s_sbh);
 467         sb->s_dirt = 1;
 468         if (err) goto fail;
 469
 470         inode->i_uid = current->fsuid;
 471         if (test_opt (sb, GRPID))
 472                 inode->i_gid = dir->i_gid;
 473         else if (dir->i_mode & S_ISGID) {
 474                 inode->i_gid = dir->i_gid;
 475                 if (S_ISDIR(mode))
 476                         mode |= S_ISGID;
 477         } else
 478                 inode->i_gid = current->fsgid;
 479         inode->i_mode = mode;
 480
 481         inode->i_ino = j;
 482         /* This is the optimal IO size (for stat), not the fs block size */
 483         inode->i_blksize = PAGE_SIZE;
 484         inode->i_blocks = 0;
 485         inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
 486         inode->u.ext3_i.i_flags = dir->u.ext3_i.i_flags & ~EXT3_INDEX_FL;
 487         if (S_ISLNK(mode))
 488                 inode->u.ext3_i.i_flags &= ~(EXT3_IMMUTABLE_FL|EXT3_APPEND_FL);
 489 #ifdef EXT3_FRAGMENTS
 490         inode->u.ext3_i.i_faddr = 0;
 491         inode->u.ext3_i.i_frag_no = 0;
 492         inode->u.ext3_i.i_frag_size = 0;
 493 #endif
 494         inode->u.ext3_i.i_file_acl = 0;
 495         inode->u.ext3_i.i_dir_acl = 0;
 496         inode->u.ext3_i.i_dtime = 0;
 497         INIT_LIST_HEAD(&inode->u.ext3_i.i_orphan);
 498 #ifdef EXT3_PREALLOCATE
 499         inode->u.ext3_i.i_prealloc_count = 0;
 500 #endif
 501         inode->u.ext3_i.i_block_group = i;
 502
 503         ext3_set_inode_flags(inode);
 504         if (IS_SYNC(inode))
 505                 handle->h_sync = 1;
 506         insert_inode_hash(inode);
 507         inode->i_generation = sb->u.ext3_sb.s_next_generation++;
 508
 509         inode->u.ext3_i.i_state = EXT3_STATE_NEW;
 510         err = ext3_mark_inode_dirty(handle, inode);
 511         if (err) goto fail;
 512
 513         unlock_super (sb);
 514         if(DQUOT_ALLOC_INODE(inode)) {
 515                 DQUOT_DROP(inode);
 516                 inode->i_flags |= S_NOQUOTA;
 517                 inode->i_nlink = 0;
 518                 iput(inode);
 519                 return ERR_PTR(-EDQUOT);
 520         }
 521         ext3_debug ("allocating inode %lu\n", inode->i_ino);
 522         return inode;
 523
 524 fail:
 525         ext3_std_error(sb, err);
 526 out:
 527         unlock_super(sb);
 528         iput(inode);
 529         return ERR_PTR(err);
 530 }
 531
 532 /* Verify that we are loading a valid orphan from disk */
 533 struct inode *ext3_orphan_get(struct super_block *sb, unsigned long ino)
 534 {
 535         unsigned long max_ino = le32_to_cpu(EXT3_SB(sb)->s_es->s_inodes_count);
 536         unsigned long block_group;
 537         int bit;
 538         int bitmap_nr;
 539         struct buffer_head *bh;
 540         struct inode *inode = NULL;
 541
 542         /* Error cases - e2fsck has already cleaned up for us */
 543         if (ino > max_ino) {
 544                 ext3_warning(sb, __FUNCTION__,
 545                              "bad orphan ino %lu!  e2fsck was run?\n", ino);
 546                 return NULL;
 547         }
 548
 549         block_group = (ino - 1) / EXT3_INODES_PER_GROUP(sb);
 550         bit = (ino - 1) % EXT3_INODES_PER_GROUP(sb);
 551         if ((bitmap_nr = load_inode_bitmap(sb, block_group)) < 0 ||
 552             !(bh = EXT3_SB(sb)->s_inode_bitmap[bitmap_nr])) {
 553                 ext3_warning(sb, __FUNCTION__,
 554                              "inode bitmap error for orphan %lu\n", ino);
 555                 return NULL;
 556         }
 557
 558         /* Having the inode bit set should be a 100% indicator that this
 559          * is a valid orphan (no e2fsck run on fs).  Orphans also include
 560          * inodes that were being truncated, so we can't check i_nlink==0.
 561          */
 562         if (!ext3_test_bit(bit, bh->b_data) || !(inode = iget(sb, ino)) ||
 563             is_bad_inode(inode) || NEXT_ORPHAN(inode) > max_ino) {
 564                 ext3_warning(sb, __FUNCTION__,
 565                              "bad orphan inode %lu!  e2fsck was run?\n", ino);
 566                 printk(KERN_NOTICE "ext3_test_bit(bit=%d, block=%ld) = %d\n",
 567                        bit, bh->b_blocknr, ext3_test_bit(bit, bh->b_data));
 568                 printk(KERN_NOTICE "inode=%p\n", inode);
 569                 if (inode) {
 570                         printk(KERN_NOTICE "is_bad_inode(inode)=%d\n",
 571                                is_bad_inode(inode));
 572                         printk(KERN_NOTICE "NEXT_ORPHAN(inode)=%u\n",
 573                                NEXT_ORPHAN(inode));
 574                         printk(KERN_NOTICE "max_ino=%lu\n", max_ino);
 575                 }
 576                 /* Avoid freeing blocks if we got a bad deleted inode */
 577                 if (inode && inode->i_nlink == 0)
 578                         inode->i_blocks = 0;
 579                 iput(inode);
 580                 return NULL;
 581         }
 582
 583         return inode;
 584 }
 585
 586 unsigned long ext3_count_free_inodes (struct super_block * sb)
 587 {
 588 #ifdef EXT3FS_DEBUG
 589         struct ext3_super_block * es;
 590         unsigned long desc_count, bitmap_count, x;
 591         int bitmap_nr;
 592         struct ext3_group_desc * gdp;
 593         int i;
 594
 595         lock_super (sb);
 596         es = sb->u.ext3_sb.s_es;
 597         desc_count = 0;
 598         bitmap_count = 0;
 599         gdp = NULL;
 600         for (i = 0; i < sb->u.ext3_sb.s_groups_count; i++) {
 601                 gdp = ext3_get_group_desc (sb, i, NULL);
 602                 if (!gdp)
 603                         continue;
 604                 desc_count += le16_to_cpu(gdp->bg_free_inodes_count);
 605                 bitmap_nr = load_inode_bitmap (sb, i);
 606                 if (bitmap_nr < 0)
 607                         continue;
 608
 609                 x = ext3_count_free (sb->u.ext3_sb.s_inode_bitmap[bitmap_nr],
 610                                      EXT3_INODES_PER_GROUP(sb) / 8);
 611                 printk ("group %d: stored = %d, counted = %lu\n",
 612                         i, le16_to_cpu(gdp->bg_free_inodes_count), x);
 613                 bitmap_count += x;
 614         }
 615         printk("ext3_count_free_inodes: stored = %lu, computed = %lu, %lu\n",
 616                 le32_to_cpu(es->s_free_inodes_count), desc_count, bitmap_count);
 617         unlock_super (sb);
 618         return desc_count;
 619 #else
 620         return le32_to_cpu(sb->u.ext3_sb.s_es->s_free_inodes_count);
 621 #endif
 622 }
 623
 624 #ifdef CONFIG_EXT3_CHECK
 625 /* Called at mount-time, super-block is locked */
 626 void ext3_check_inodes_bitmap (struct super_block * sb)
 627 {
 628         struct ext3_super_block * es;
 629         unsigned long desc_count, bitmap_count, x;
 630         int bitmap_nr;
 631         struct ext3_group_desc * gdp;
 632         int i;
 633
 634         es = sb->u.ext3_sb.s_es;
 635         desc_count = 0;
 636         bitmap_count = 0;
 637         gdp = NULL;
 638         for (i = 0; i < sb->u.ext3_sb.s_groups_count; i++) {
 639                 gdp = ext3_get_group_desc (sb, i, NULL);
 640                 if (!gdp)
 641                         continue;
 642                 desc_count += le16_to_cpu(gdp->bg_free_inodes_count);
 643                 bitmap_nr = load_inode_bitmap (sb, i);
 644                 if (bitmap_nr < 0)
 645                         continue;
 646
 647                 x = ext3_count_free (sb->u.ext3_sb.s_inode_bitmap[bitmap_nr],
 648                                      EXT3_INODES_PER_GROUP(sb) / 8);
 649                 if (le16_to_cpu(gdp->bg_free_inodes_count) != x)
 650                         ext3_error (sb, "ext3_check_inodes_bitmap",
 651                                     "Wrong free inodes count in group %d, "
 652                                     "stored = %d, counted = %lu", i,
 653                                     le16_to_cpu(gdp->bg_free_inodes_count), x);
 654                 bitmap_count += x;
 655         }
 656         if (le32_to_cpu(es->s_free_inodes_count) != bitmap_count)
 657                 ext3_error (sb, "ext3_check_inodes_bitmap",
 658                             "Wrong free inodes count in super block, "
 659                             "stored = %lu, counted = %lu",
 660                             (unsigned long)le32_to_cpu(es->s_free_inodes_count),
 661                             bitmap_count);
 662 }
 663 #endif