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 #include <linux/config.h>
  16 #include <linux/quotaops.h>
  17 #include <linux/sched.h>
  18 #include <linux/backing-dev.h>
  19 #include <linux/buffer_head.h>
  20 #include <linux/random.h>
  21 #include "ext2.h"
  22 #include "xattr.h"
  23 #include "acl.h"
  24
  25 /*
  26  * ialloc.c contains the inodes allocation and deallocation routines
  27  */
  28
  29 /*
  30  * The free inodes are managed by bitmaps.  A file system contains several
  31  * blocks groups.  Each group contains 1 bitmap block for blocks, 1 bitmap
  32  * block for inodes, N blocks for the inode table and data blocks.
  33  *
  34  * The file system contains group descriptors which are located after the
  35  * super block.  Each descriptor contains the number of the bitmap block and
  36  * the free blocks count in the block.
  37  */
  38
  39
  40 /*
  41  * Read the inode allocation bitmap for a given block_group, reading
  42  * into the specified slot in the superblock's bitmap cache.
  43  *
  44  * Return buffer_head of bitmap on success or NULL.
  45  */
  46 static struct buffer_head *
  47 read_inode_bitmap(struct super_block * sb, unsigned long block_group)
  48 {
  49         struct ext2_group_desc *desc;
  50         struct buffer_head *bh = NULL;
  51
  52         desc = ext2_get_group_desc(sb, block_group, NULL);
  53         if (!desc)
  54                 goto error_out;
  55
  56         bh = sb_bread(sb, le32_to_cpu(desc->bg_inode_bitmap));
  57         if (!bh)
  58                 ext2_error(sb, "read_inode_bitmap",
  59                             "Cannot read inode bitmap - "
  60                             "block_group = %lu, inode_bitmap = %u",
  61                             block_group, le32_to_cpu(desc->bg_inode_bitmap));
  62 error_out:
  63         return bh;
  64 }
  65
  66 static void ext2_release_inode(struct super_block *sb, int group, int dir)
  67 {
  68         struct ext2_group_desc * desc;
  69         struct buffer_head *bh;
  70
  71         desc = ext2_get_group_desc(sb, group, &bh);
  72         if (!desc) {
  73                 ext2_error(sb, "ext2_release_inode",
  74                         "can't get descriptor for group %d", group);
  75                 return;
  76         }
  77
  78         spin_lock(sb_bgl_lock(EXT2_SB(sb), group));
  79         desc->bg_free_inodes_count =
  80                 cpu_to_le16(le16_to_cpu(desc->bg_free_inodes_count) + 1);
  81         if (dir)
  82                 desc->bg_used_dirs_count =
  83                         cpu_to_le16(le16_to_cpu(desc->bg_used_dirs_count) - 1);
  84         spin_unlock(sb_bgl_lock(EXT2_SB(sb), group));
  85         if (dir)
  86                 percpu_counter_dec(&EXT2_SB(sb)->s_dirs_counter);
  87         sb->s_dirt = 1;
  88         mark_buffer_dirty(bh);
  89 }
  90
  91 /*
  92  * NOTE! When we get the inode, we're the only people
  93  * that have access to it, and as such there are no
  94  * race conditions we have to worry about. The inode
  95  * is not on the hash-lists, and it cannot be reached
  96  * through the filesystem because the directory entry
  97  * has been deleted earlier.
  98  *
  99  * HOWEVER: we must make sure that we get no aliases,
 100  * which means that we have to call "clear_inode()"
 101  * _before_ we mark the inode not in use in the inode
 102  * bitmaps. Otherwise a newly created file might use
 103  * the same inode number (not actually the same pointer
 104  * though), and then we'd have two inodes sharing the
 105  * same inode number and space on the harddisk.
 106  */
 107 void ext2_free_inode (struct inode * inode)
 108 {
 109         struct super_block * sb = inode->i_sb;
 110         int is_directory;
 111         unsigned long ino;
 112         struct buffer_head *bitmap_bh = NULL;
 113         unsigned long block_group;
 114         unsigned long bit;
 115         struct ext2_super_block * es;
 116
 117         ino = inode->i_ino;
 118         ext2_debug ("freeing inode %lu\n", ino);
 119
 120         /*
 121          * Note: we must free any quota before locking the superblock,
 122          * as writing the quota to disk may need the lock as well.
 123          */
 124         if (!is_bad_inode(inode)) {
 125                 /* Quota is already initialized in iput() */
 126                 ext2_xattr_delete_inode(inode);
 127                 DQUOT_FREE_INODE(inode);
 128                 DQUOT_DROP(inode);
 129         }
 130
 131         es = EXT2_SB(sb)->s_es;
 132         is_directory = S_ISDIR(inode->i_mode);
 133
 134         /* Do this BEFORE marking the inode not in use or returning an error */
 135         clear_inode (inode);
 136
 137         if (ino < EXT2_FIRST_INO(sb) ||
 138             ino > le32_to_cpu(es->s_inodes_count)) {
 139                 ext2_error (sb, "ext2_free_inode",
 140                             "reserved or nonexistent inode %lu", ino);
 141                 goto error_return;
 142         }
 143         block_group = (ino - 1) / EXT2_INODES_PER_GROUP(sb);
 144         bit = (ino - 1) % EXT2_INODES_PER_GROUP(sb);
 145         brelse(bitmap_bh);
 146         bitmap_bh = read_inode_bitmap(sb, block_group);
 147         if (!bitmap_bh)
 148                 goto error_return;
 149
 150         /* Ok, now we can actually update the inode bitmaps.. */
 151         if (!ext2_clear_bit_atomic(sb_bgl_lock(EXT2_SB(sb), block_group),
 152                                 bit, (void *) bitmap_bh->b_data))
 153                 ext2_error (sb, "ext2_free_inode",
 154                               "bit already cleared for inode %lu", ino);
 155         else
 156                 ext2_release_inode(sb, block_group, is_directory);
 157         mark_buffer_dirty(bitmap_bh);
 158         if (sb->s_flags & MS_SYNCHRONOUS)
 159                 sync_dirty_buffer(bitmap_bh);
 160 error_return:
 161         brelse(bitmap_bh);
 162 }
 163
 164 /*
 165  * We perform asynchronous prereading of the new inode's inode block when
 166  * we create the inode, in the expectation that the inode will be written
 167  * back soon.  There are two reasons:
 168  *
 169  * - When creating a large number of files, the async prereads will be
 170  *   nicely merged into large reads
 171  * - When writing out a large number of inodes, we don't need to keep on
 172  *   stalling the writes while we read the inode block.
 173  *
 174  * FIXME: ext2_get_group_desc() needs to be simplified.
 175  */
 176 static void ext2_preread_inode(struct inode *inode)
 177 {
 178         unsigned long block_group;
 179         unsigned long offset;
 180         unsigned long block;
 181         struct buffer_head *bh;
 182         struct ext2_group_desc * gdp;
 183         struct backing_dev_info *bdi;
 184
 185         bdi = inode->i_mapping->backing_dev_info;
 186         if (bdi_read_congested(bdi))
 187                 return;
 188         if (bdi_write_congested(bdi))
 189                 return;
 190
 191         block_group = (inode->i_ino - 1) / EXT2_INODES_PER_GROUP(inode->i_sb);
 192         gdp = ext2_get_group_desc(inode->i_sb, block_group, &bh);
 193         if (gdp == NULL)
 194                 return;
 195
 196         /*
 197          * Figure out the offset within the block group inode table
 198          */
 199         offset = ((inode->i_ino - 1) % EXT2_INODES_PER_GROUP(inode->i_sb)) *
 200                                 EXT2_INODE_SIZE(inode->i_sb);
 201         block = le32_to_cpu(gdp->bg_inode_table) +
 202                                 (offset >> EXT2_BLOCK_SIZE_BITS(inode->i_sb));
 203         sb_breadahead(inode->i_sb, block);
 204 }
 205
 206 /*
 207  * There are two policies for allocating an inode.  If the new inode is
 208  * a directory, then a forward search is made for a block group with both
 209  * free space and a low directory-to-inode ratio; if that fails, then of
 210  * the groups with above-average free space, that group with the fewest
 211  * directories already is chosen.
 212  *
 213  * For other inodes, search forward from the parent directory\'s block
 214  * group to find a free inode.
 215  */
 216 static int find_group_dir(struct super_block *sb, struct inode *parent)
 217 {
 218         int ngroups = EXT2_SB(sb)->s_groups_count;
 219         int avefreei = ext2_count_free_inodes(sb) / ngroups;
 220         struct ext2_group_desc *desc, *best_desc = NULL;
 221         struct buffer_head *bh, *best_bh = NULL;
 222         int group, best_group = -1;
 223
 224         for (group = 0; group < ngroups; group++) {
 225                 desc = ext2_get_group_desc (sb, group, &bh);
 226                 if (!desc || !desc->bg_free_inodes_count)
 227                         continue;
 228                 if (le16_to_cpu(desc->bg_free_inodes_count) < avefreei)
 229                         continue;
 230                 if (!best_desc ||
 231                     (le16_to_cpu(desc->bg_free_blocks_count) >
 232                      le16_to_cpu(best_desc->bg_free_blocks_count))) {
 233                         best_group = group;
 234                         best_desc = desc;
 235                         best_bh = bh;
 236                 }
 237         }
 238         if (!best_desc)
 239                 return -1;
 240
 241         return best_group;
 242 }
 243
 244 /*
 245  * Orlov's allocator for directories.
 246  *
 247  * We always try to spread first-level directories.
 248  *
 249  * If there are blockgroups with both free inodes and free blocks counts
 250  * not worse than average we return one with smallest directory count.
 251  * Otherwise we simply return a random group.
 252  *
 253  * For the rest rules look so:
 254  *
 255  * It's OK to put directory into a group unless
 256  * it has too many directories already (max_dirs) or
 257  * it has too few free inodes left (min_inodes) or
 258  * it has too few free blocks left (min_blocks) or
 259  * it's already running too large debt (max_debt).
 260  * Parent's group is prefered, if it doesn't satisfy these
 261  * conditions we search cyclically through the rest. If none
 262  * of the groups look good we just look for a group with more
 263  * free inodes than average (starting at parent's group).
 264  *
 265  * Debt is incremented each time we allocate a directory and decremented
 266  * when we allocate an inode, within 0--255.
 267  */
 268
 269 #define INODE_COST 64
 270 #define BLOCK_COST 256
 271
 272 static int find_group_orlov(struct super_block *sb, struct inode *parent)
 273 {
 274         int parent_group = EXT2_I(parent)->i_block_group;
 275         struct ext2_sb_info *sbi = EXT2_SB(sb);
 276         struct ext2_super_block *es = sbi->s_es;
 277         int ngroups = sbi->s_groups_count;
 278         int inodes_per_group = EXT2_INODES_PER_GROUP(sb);
 279         int freei;
 280         int avefreei;
 281         int free_blocks;
 282         int avefreeb;
 283         int blocks_per_dir;
 284         int ndirs;
 285         int max_debt, max_dirs, min_blocks, min_inodes;
 286         int group = -1, i;
 287         struct ext2_group_desc *desc;
 288         struct buffer_head *bh;
 289
 290         freei = percpu_counter_read_positive(&sbi->s_freeinodes_counter);
 291         avefreei = freei / ngroups;
 292         free_blocks = percpu_counter_read_positive(&sbi->s_freeblocks_counter);
 293         avefreeb = free_blocks / ngroups;
 294         ndirs = percpu_counter_read_positive(&sbi->s_dirs_counter);
 295
 296         if ((parent == sb->s_root->d_inode) ||
 297             (EXT2_I(parent)->i_flags & EXT2_TOPDIR_FL)) {
 298                 struct ext2_group_desc *best_desc = NULL;
 299                 struct buffer_head *best_bh = NULL;
 300                 int best_ndir = inodes_per_group;
 301                 int best_group = -1;
 302
 303                 get_random_bytes(&group, sizeof(group));
 304                 parent_group = (unsigned)group % ngroups;
 305                 for (i = 0; i < ngroups; i++) {
 306                         group = (parent_group + i) % ngroups;
 307                         desc = ext2_get_group_desc (sb, group, &bh);
 308                         if (!desc || !desc->bg_free_inodes_count)
 309                                 continue;
 310                         if (le16_to_cpu(desc->bg_used_dirs_count) >= best_ndir)
 311                                 continue;
 312                         if (le16_to_cpu(desc->bg_free_inodes_count) < avefreei)
 313                                 continue;
 314                         if (le16_to_cpu(desc->bg_free_blocks_count) < avefreeb)
 315                                 continue;
 316                         best_group = group;
 317                         best_ndir = le16_to_cpu(desc->bg_used_dirs_count);
 318                         best_desc = desc;
 319                         best_bh = bh;
 320                 }
 321                 if (best_group >= 0) {
 322                         desc = best_desc;
 323                         bh = best_bh;
 324                         group = best_group;
 325                         goto found;
 326                 }
 327                 goto fallback;
 328         }
 329
 330         if (ndirs == 0)
 331                 ndirs = 1;      /* percpu_counters are approximate... */
 332
 333         blocks_per_dir = (le32_to_cpu(es->s_blocks_count)-free_blocks) / ndirs;
 334
 335         max_dirs = ndirs / ngroups + inodes_per_group / 16;
 336         min_inodes = avefreei - inodes_per_group / 4;
 337         min_blocks = avefreeb - EXT2_BLOCKS_PER_GROUP(sb) / 4;
 338
 339         max_debt = EXT2_BLOCKS_PER_GROUP(sb) / max(blocks_per_dir, BLOCK_COST);
 340         if (max_debt * INODE_COST > inodes_per_group)
 341                 max_debt = inodes_per_group / INODE_COST;
 342         if (max_debt > 255)
 343                 max_debt = 255;
 344         if (max_debt == 0)
 345                 max_debt = 1;
 346
 347         for (i = 0; i < ngroups; i++) {
 348                 group = (parent_group + i) % ngroups;
 349                 desc = ext2_get_group_desc (sb, group, &bh);
 350                 if (!desc || !desc->bg_free_inodes_count)
 351                         continue;
 352                 if (sbi->s_debts[group] >= max_debt)
 353                         continue;
 354                 if (le16_to_cpu(desc->bg_used_dirs_count) >= max_dirs)
 355                         continue;
 356                 if (le16_to_cpu(desc->bg_free_inodes_count) < min_inodes)
 357                         continue;
 358                 if (le16_to_cpu(desc->bg_free_blocks_count) < min_blocks)
 359                         continue;
 360                 goto found;
 361         }
 362
 363 fallback:
 364         for (i = 0; i < ngroups; i++) {
 365                 group = (parent_group + i) % ngroups;
 366                 desc = ext2_get_group_desc (sb, group, &bh);
 367                 if (!desc || !desc->bg_free_inodes_count)
 368                         continue;
 369                 if (le16_to_cpu(desc->bg_free_inodes_count) >= avefreei)
 370                         goto found;
 371         }
 372
 373         if (avefreei) {
 374                 /*
 375                  * The free-inodes counter is approximate, and for really small
 376                  * filesystems the above test can fail to find any blockgroups
 377                  */
 378                 avefreei = 0;
 379                 goto fallback;
 380         }
 381
 382         return -1;
 383
 384 found:
 385         return group;
 386 }
 387
 388 static int find_group_other(struct super_block *sb, struct inode *parent)
 389 {
 390         int parent_group = EXT2_I(parent)->i_block_group;
 391         int ngroups = EXT2_SB(sb)->s_groups_count;
 392         struct ext2_group_desc *desc;
 393         struct buffer_head *bh;
 394         int group, i;
 395
 396         /*
 397          * Try to place the inode in its parent directory
 398          */
 399         group = parent_group;
 400         desc = ext2_get_group_desc (sb, group, &bh);
 401         if (desc && le16_to_cpu(desc->bg_free_inodes_count) &&
 402                         le16_to_cpu(desc->bg_free_blocks_count))
 403                 goto found;
 404
 405         /*
 406          * We're going to place this inode in a different blockgroup from its
 407          * parent.  We want to cause files in a common directory to all land in
 408          * the same blockgroup.  But we want files which are in a different
 409          * directory which shares a blockgroup with our parent to land in a
 410          * different blockgroup.
 411          *
 412          * So add our directory's i_ino into the starting point for the hash.
 413          */
 414         group = (group + parent->i_ino) % ngroups;
 415
 416         /*
 417          * Use a quadratic hash to find a group with a free inode and some
 418          * free blocks.
 419          */
 420         for (i = 1; i < ngroups; i <<= 1) {
 421                 group += i;
 422                 if (group >= ngroups)
 423                         group -= ngroups;
 424                 desc = ext2_get_group_desc (sb, group, &bh);
 425                 if (desc && le16_to_cpu(desc->bg_free_inodes_count) &&
 426                                 le16_to_cpu(desc->bg_free_blocks_count))
 427                         goto found;
 428         }
 429
 430         /*
 431          * That failed: try linear search for a free inode, even if that group
 432          * has no free blocks.
 433          */
 434         group = parent_group;
 435         for (i = 0; i < ngroups; i++) {
 436                 if (++group >= ngroups)
 437                         group = 0;
 438                 desc = ext2_get_group_desc (sb, group, &bh);
 439                 if (desc && le16_to_cpu(desc->bg_free_inodes_count))
 440                         goto found;
 441         }
 442
 443         return -1;
 444
 445 found:
 446         return group;
 447 }
 448
 449 struct inode *ext2_new_inode(struct inode *dir, int mode)
 450 {
 451         struct super_block *sb;
 452         struct buffer_head *bitmap_bh = NULL;
 453         struct buffer_head *bh2;
 454         int group, i;
 455         ino_t ino = 0;
 456         struct inode * inode;
 457         struct ext2_group_desc *gdp;
 458         struct ext2_super_block *es;
 459         struct ext2_inode_info *ei;
 460         struct ext2_sb_info *sbi;
 461         int err;
 462
 463         sb = dir->i_sb;
 464         inode = new_inode(sb);
 465         if (!inode)
 466                 return ERR_PTR(-ENOMEM);
 467
 468         ei = EXT2_I(inode);
 469         sbi = EXT2_SB(sb);
 470         es = sbi->s_es;
 471         if (S_ISDIR(mode)) {
 472                 if (test_opt(sb, OLDALLOC))
 473                         group = find_group_dir(sb, dir);
 474                 else
 475                         group = find_group_orlov(sb, dir);
 476         } else
 477                 group = find_group_other(sb, dir);
 478
 479         if (group == -1) {
 480                 err = -ENOSPC;
 481                 goto fail;
 482         }
 483
 484         for (i = 0; i < sbi->s_groups_count; i++) {
 485                 gdp = ext2_get_group_desc(sb, group, &bh2);
 486                 brelse(bitmap_bh);
 487                 bitmap_bh = read_inode_bitmap(sb, group);
 488                 if (!bitmap_bh) {
 489                         err = -EIO;
 490                         goto fail;
 491                 }
 492                 ino = 0;
 493
 494 repeat_in_this_group:
 495                 ino = ext2_find_next_zero_bit((unsigned long *)bitmap_bh->b_data,
 496                                               EXT2_INODES_PER_GROUP(sb), ino);
 497                 if (ino >= EXT2_INODES_PER_GROUP(sb)) {
 498                         /*
 499                          * Rare race: find_group_xx() decided that there were
 500                          * free inodes in this group, but by the time we tried
 501                          * to allocate one, they're all gone.  This can also
 502                          * occur because the counters which find_group_orlov()
 503                          * uses are approximate.  So just go and search the
 504                          * next block group.
 505                          */
 506                         if (++group == sbi->s_groups_count)
 507                                 group = 0;
 508                         continue;
 509                 }
 510                 if (ext2_set_bit_atomic(sb_bgl_lock(sbi, group),
 511                                                 ino, bitmap_bh->b_data)) {
 512                         /* we lost this inode */
 513                         if (++ino >= EXT2_INODES_PER_GROUP(sb)) {
 514                                 /* this group is exhausted, try next group */
 515                                 if (++group == sbi->s_groups_count)
 516                                         group = 0;
 517                                 continue;
 518                         }
 519                         /* try to find free inode in the same group */
 520                         goto repeat_in_this_group;
 521                 }
 522                 goto got;
 523         }
 524
 525         /*
 526          * Scanned all blockgroups.
 527          */
 528         err = -ENOSPC;
 529         goto fail;
 530 got:
 531         mark_buffer_dirty(bitmap_bh);
 532         if (sb->s_flags & MS_SYNCHRONOUS)
 533                 sync_dirty_buffer(bitmap_bh);
 534         brelse(bitmap_bh);
 535
 536         ino += group * EXT2_INODES_PER_GROUP(sb) + 1;
 537         if (ino < EXT2_FIRST_INO(sb) || ino > le32_to_cpu(es->s_inodes_count)) {
 538                 ext2_error (sb, "ext2_new_inode",
 539                             "reserved inode or inode > inodes count - "
 540                             "block_group = %d,inode=%lu", group,
 541                             (unsigned long) ino);
 542                 err = -EIO;
 543                 goto fail;
 544         }
 545
 546         percpu_counter_mod(&sbi->s_freeinodes_counter, -1);
 547         if (S_ISDIR(mode))
 548                 percpu_counter_inc(&sbi->s_dirs_counter);
 549
 550         spin_lock(sb_bgl_lock(sbi, group));
 551         gdp->bg_free_inodes_count =
 552                 cpu_to_le16(le16_to_cpu(gdp->bg_free_inodes_count) - 1);
 553         if (S_ISDIR(mode)) {
 554                 if (sbi->s_debts[group] < 255)
 555                         sbi->s_debts[group]++;
 556                 gdp->bg_used_dirs_count =
 557                         cpu_to_le16(le16_to_cpu(gdp->bg_used_dirs_count) + 1);
 558         } else {
 559                 if (sbi->s_debts[group])
 560                         sbi->s_debts[group]--;
 561         }
 562         spin_unlock(sb_bgl_lock(sbi, group));
 563
 564         sb->s_dirt = 1;
 565         mark_buffer_dirty(bh2);
 566         inode->i_uid = current->fsuid;
 567         if (test_opt (sb, GRPID))
 568                 inode->i_gid = dir->i_gid;
 569         else if (dir->i_mode & S_ISGID) {
 570                 inode->i_gid = dir->i_gid;
 571                 if (S_ISDIR(mode))
 572                         mode |= S_ISGID;
 573         } else
 574                 inode->i_gid = current->fsgid;
 575         inode->i_mode = mode;
 576
 577         inode->i_ino = ino;
 578         inode->i_blksize = PAGE_SIZE;   /* This is the optimal IO size (for stat), not the fs block size */
 579         inode->i_blocks = 0;
 580         inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC;
 581         memset(ei->i_data, 0, sizeof(ei->i_data));
 582         ei->i_flags = EXT2_I(dir)->i_flags & ~EXT2_BTREE_FL;
 583         if (S_ISLNK(mode))
 584                 ei->i_flags &= ~(EXT2_IMMUTABLE_FL|EXT2_APPEND_FL);
 585         /* dirsync is only applied to directories */
 586         if (!S_ISDIR(mode))
 587                 ei->i_flags &= ~EXT2_DIRSYNC_FL;
 588         ei->i_faddr = 0;
 589         ei->i_frag_no = 0;
 590         ei->i_frag_size = 0;
 591         ei->i_file_acl = 0;
 592         ei->i_dir_acl = 0;
 593         ei->i_dtime = 0;
 594         ei->i_block_group = group;
 595         ei->i_next_alloc_block = 0;
 596         ei->i_next_alloc_goal = 0;
 597         ei->i_prealloc_block = 0;
 598         ei->i_prealloc_count = 0;
 599         ei->i_dir_start_lookup = 0;
 600         ei->i_state = EXT2_STATE_NEW;
 601         ext2_set_inode_flags(inode);
 602         spin_lock(&sbi->s_next_gen_lock);
 603         inode->i_generation = sbi->s_next_generation++;
 604         spin_unlock(&sbi->s_next_gen_lock);
 605         insert_inode_hash(inode);
 606
 607         if (DQUOT_ALLOC_INODE(inode)) {
 608                 DQUOT_DROP(inode);
 609                 err = -ENOSPC;
 610                 goto fail2;
 611         }
 612         err = ext2_init_acl(inode, dir);
 613         if (err) {
 614                 DQUOT_FREE_INODE(inode);
 615                 DQUOT_DROP(inode);
 616                 goto fail2;
 617         }
 618         mark_inode_dirty(inode);
 619         ext2_debug("allocating inode %lu\n", inode->i_ino);
 620         ext2_preread_inode(inode);
 621         return inode;
 622
 623 fail2:
 624         inode->i_flags |= S_NOQUOTA;
 625         inode->i_nlink = 0;
 626         iput(inode);
 627         return ERR_PTR(err);
 628
 629 fail:
 630         make_bad_inode(inode);
 631         iput(inode);
 632         return ERR_PTR(err);
 633 }
 634
 635 unsigned long ext2_count_free_inodes (struct super_block * sb)
 636 {
 637         struct ext2_group_desc *desc;
 638         unsigned long desc_count = 0;
 639         int i;
 640
 641 #ifdef EXT2FS_DEBUG
 642         struct ext2_super_block *es;
 643         unsigned long bitmap_count = 0;
 644         struct buffer_head *bitmap_bh = NULL;
 645
 646         lock_super (sb);
 647         es = EXT2_SB(sb)->s_es;
 648         for (i = 0; i < EXT2_SB(sb)->s_groups_count; i++) {
 649                 unsigned x;
 650
 651                 desc = ext2_get_group_desc (sb, i, NULL);
 652                 if (!desc)
 653                         continue;
 654                 desc_count += le16_to_cpu(desc->bg_free_inodes_count);
 655                 brelse(bitmap_bh);
 656                 bitmap_bh = read_inode_bitmap(sb, i);
 657                 if (!bitmap_bh)
 658                         continue;
 659
 660                 x = ext2_count_free(bitmap_bh, EXT2_INODES_PER_GROUP(sb) / 8);
 661                 printk("group %d: stored = %d, counted = %u\n",
 662                         i, le16_to_cpu(desc->bg_free_inodes_count), x);
 663                 bitmap_count += x;
 664         }
 665         brelse(bitmap_bh);
 666         printk("ext2_count_free_inodes: stored = %lu, computed = %lu, %lu\n",
 667                 percpu_counter_read(&EXT2_SB(sb)->s_freeinodes_counter),
 668                 desc_count, bitmap_count);
 669         unlock_super(sb);
 670         return desc_count;
 671 #else
 672         for (i = 0; i < EXT2_SB(sb)->s_groups_count; i++) {
 673                 desc = ext2_get_group_desc (sb, i, NULL);
 674                 if (!desc)
 675                         continue;
 676                 desc_count += le16_to_cpu(desc->bg_free_inodes_count);
 677         }
 678         return desc_count;
 679 #endif
 680 }
 681
 682 /* Called at mount-time, super-block is locked */
 683 unsigned long ext2_count_dirs (struct super_block * sb)
 684 {
 685         unsigned long count = 0;
 686         int i;
 687
 688         for (i = 0; i < EXT2_SB(sb)->s_groups_count; i++) {
 689                 struct ext2_group_desc *gdp = ext2_get_group_desc (sb, i, NULL);
 690                 if (!gdp)
 691                         continue;
 692                 count += le16_to_cpu(gdp->bg_used_dirs_count);
 693         }
 694         return count;
 695 }
 696
 697 #ifdef CONFIG_EXT2_CHECK
 698 /* Called at mount-time, super-block is locked */
 699 void ext2_check_inodes_bitmap (struct super_block * sb)
 700 {
 701         struct ext2_super_block * es = EXT2_SB(sb)->s_es;
 702         unsigned long desc_count = 0, bitmap_count = 0;
 703         struct buffer_head *bitmap_bh = NULL;
 704         int i;
 705
 706         for (i = 0; i < EXT2_SB(sb)->s_groups_count; i++) {
 707                 struct ext2_group_desc *desc;
 708                 unsigned x;
 709
 710                 desc = ext2_get_group_desc(sb, i, NULL);
 711                 if (!desc)
 712                         continue;
 713                 desc_count += le16_to_cpu(desc->bg_free_inodes_count);
 714                 brelse(bitmap_bh);
 715                 bitmap_bh = read_inode_bitmap(sb, i);
 716                 if (!bitmap_bh)
 717                         continue;
 718
 719                 x = ext2_count_free(bitmap_bh, EXT2_INODES_PER_GROUP(sb) / 8);
 720                 if (le16_to_cpu(desc->bg_free_inodes_count) != x)
 721                         ext2_error (sb, "ext2_check_inodes_bitmap",
 722                                     "Wrong free inodes count in group %d, "
 723                                     "stored = %d, counted = %lu", i,
 724                                     le16_to_cpu(desc->bg_free_inodes_count), x);
 725                 bitmap_count += x;
 726         }
 727         brelse(bitmap_bh);
 728         if (percpu_counter_read(&EXT2_SB(sb)->s_freeinodes_counter) !=
 729                                 bitmap_count)
 730                 ext2_error(sb, "ext2_check_inodes_bitmap",
 731                             "Wrong free inodes count in super block, "
 732                             "stored = %lu, counted = %lu",
 733                             (unsigned long)le32_to_cpu(es->s_free_inodes_count),
 734                             bitmap_count);
 735 }
 736 #endif