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/time.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/quotaops.h>
  23 #include <linux/buffer_head.h>
  24 #include <linux/random.h>
  25 #include <linux/bitops.h>
  26
  27 #include <asm/byteorder.h>
  28
  29 #include "xattr.h"
  30 #include "acl.h"
  31
  32 /*
  33  * ialloc.c contains the inodes allocation and deallocation routines
  34  */
  35
  36 /*
  37  * The free inodes are managed by bitmaps.  A file system contains several
  38  * blocks groups.  Each group contains 1 bitmap block for blocks, 1 bitmap
  39  * block for inodes, N blocks for the inode table and data blocks.
  40  *
  41  * The file system contains group descriptors which are located after the
  42  * super block.  Each descriptor contains the number of the bitmap block and
  43  * the free blocks count in the block.
  44  */
  45
  46
  47 /*
  48  * Read the inode allocation bitmap for a given block_group, reading
  49  * into the specified slot in the superblock's bitmap cache.
  50  *
  51  * Return buffer_head of bitmap on success or NULL.
  52  */
  53 static struct buffer_head *
  54 read_inode_bitmap(struct super_block * sb, unsigned long block_group)
  55 {
  56         struct ext3_group_desc *desc;
  57         struct buffer_head *bh = NULL;
  58
  59         desc = ext3_get_group_desc(sb, block_group, NULL);
  60         if (!desc)
  61                 goto error_out;
  62
  63         bh = sb_bread(sb, le32_to_cpu(desc->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, le32_to_cpu(desc->bg_inode_bitmap));
  69 error_out:
  70         return bh;
  71 }
  72
  73 /*
  74  * NOTE! When we get the inode, we're the only people
  75  * that have access to it, and as such there are no
  76  * race conditions we have to worry about. The inode
  77  * is not on the hash-lists, and it cannot be reached
  78  * through the filesystem because the directory entry
  79  * has been deleted earlier.
  80  *
  81  * HOWEVER: we must make sure that we get no aliases,
  82  * which means that we have to call "clear_inode()"
  83  * _before_ we mark the inode not in use in the inode
  84  * bitmaps. Otherwise a newly created file might use
  85  * the same inode number (not actually the same pointer
  86  * though), and then we'd have two inodes sharing the
  87  * same inode number and space on the harddisk.
  88  */
  89 void ext3_free_inode (handle_t *handle, struct inode * inode)
  90 {
  91         struct super_block * sb = inode->i_sb;
  92         int is_directory;
  93         unsigned long ino;
  94         struct buffer_head *bitmap_bh = NULL;
  95         struct buffer_head *bh2;
  96         unsigned long block_group;
  97         unsigned long bit;
  98         struct ext3_group_desc * gdp;
  99         struct ext3_super_block * es;
 100         struct ext3_sb_info *sbi;
 101         int fatal = 0, err;
 102
 103         if (atomic_read(&inode->i_count) > 1) {
 104                 printk ("ext3_free_inode: inode has count=%d\n",
 105                                         atomic_read(&inode->i_count));
 106                 return;
 107         }
 108         if (inode->i_nlink) {
 109                 printk ("ext3_free_inode: inode has nlink=%d\n",
 110                         inode->i_nlink);
 111                 return;
 112         }
 113         if (!sb) {
 114                 printk("ext3_free_inode: inode on nonexistent device\n");
 115                 return;
 116         }
 117         sbi = EXT3_SB(sb);
 118
 119         ino = inode->i_ino;
 120         ext3_debug ("freeing inode %lu\n", ino);
 121
 122         /*
 123          * Note: we must free any quota before locking the superblock,
 124          * as writing the quota to disk may need the lock as well.
 125          */
 126         DQUOT_INIT(inode);
 127         ext3_xattr_delete_inode(handle, inode);
 128         DQUOT_FREE_INODE(inode);
 129         DQUOT_DROP(inode);
 130
 131         is_directory = S_ISDIR(inode->i_mode);
 132
 133         /* Do this BEFORE marking the inode not in use or returning an error */
 134         clear_inode (inode);
 135
 136         es = EXT3_SB(sb)->s_es;
 137         if (ino < EXT3_FIRST_INO(sb) || ino > le32_to_cpu(es->s_inodes_count)) {
 138                 ext3_error (sb, "ext3_free_inode",
 139                             "reserved or nonexistent inode %lu", ino);
 140                 goto error_return;
 141         }
 142         block_group = (ino - 1) / EXT3_INODES_PER_GROUP(sb);
 143         bit = (ino - 1) % EXT3_INODES_PER_GROUP(sb);
 144         bitmap_bh = read_inode_bitmap(sb, block_group);
 145         if (!bitmap_bh)
 146                 goto error_return;
 147
 148         BUFFER_TRACE(bitmap_bh, "get_write_access");
 149         fatal = ext3_journal_get_write_access(handle, bitmap_bh);
 150         if (fatal)
 151                 goto error_return;
 152
 153         /* Ok, now we can actually update the inode bitmaps.. */
 154         if (!ext3_clear_bit_atomic(sb_bgl_lock(sbi, block_group),
 155                                         bit, bitmap_bh->b_data))
 156                 ext3_error (sb, "ext3_free_inode",
 157                               "bit already cleared for inode %lu", ino);
 158         else {
 159                 gdp = ext3_get_group_desc (sb, block_group, &bh2);
 160
 161                 BUFFER_TRACE(bh2, "get_write_access");
 162                 fatal = ext3_journal_get_write_access(handle, bh2);
 163                 if (fatal) goto error_return;
 164
 165                 if (gdp) {
 166                         spin_lock(sb_bgl_lock(sbi, block_group));
 167                         gdp->bg_free_inodes_count = cpu_to_le16(
 168                                 le16_to_cpu(gdp->bg_free_inodes_count) + 1);
 169                         if (is_directory)
 170                                 gdp->bg_used_dirs_count = cpu_to_le16(
 171                                   le16_to_cpu(gdp->bg_used_dirs_count) - 1);
 172                         spin_unlock(sb_bgl_lock(sbi, block_group));
 173                         percpu_counter_inc(&sbi->s_freeinodes_counter);
 174                         if (is_directory)
 175                                 percpu_counter_dec(&sbi->s_dirs_counter);
 176
 177                 }
 178                 BUFFER_TRACE(bh2, "call ext3_journal_dirty_metadata");
 179                 err = ext3_journal_dirty_metadata(handle, bh2);
 180                 if (!fatal) fatal = err;
 181         }
 182         BUFFER_TRACE(bitmap_bh, "call ext3_journal_dirty_metadata");
 183         err = ext3_journal_dirty_metadata(handle, bitmap_bh);
 184         if (!fatal)
 185                 fatal = err;
 186         sb->s_dirt = 1;
 187 error_return:
 188         brelse(bitmap_bh);
 189         ext3_std_error(sb, fatal);
 190 }
 191
 192 /*
 193  * There are two policies for allocating an inode.  If the new inode is
 194  * a directory, then a forward search is made for a block group with both
 195  * free space and a low directory-to-inode ratio; if that fails, then of
 196  * the groups with above-average free space, that group with the fewest
 197  * directories already is chosen.
 198  *
 199  * For other inodes, search forward from the parent directory\'s block
 200  * group to find a free inode.
 201  */
 202 static int find_group_dir(struct super_block *sb, struct inode *parent)
 203 {
 204         int ngroups = EXT3_SB(sb)->s_groups_count;
 205         unsigned int freei, avefreei;
 206         struct ext3_group_desc *desc, *best_desc = NULL;
 207         struct buffer_head *bh;
 208         int group, best_group = -1;
 209
 210         freei = percpu_counter_read_positive(&EXT3_SB(sb)->s_freeinodes_counter);
 211         avefreei = freei / ngroups;
 212
 213         for (group = 0; group < ngroups; group++) {
 214                 desc = ext3_get_group_desc (sb, group, &bh);
 215                 if (!desc || !desc->bg_free_inodes_count)
 216                         continue;
 217                 if (le16_to_cpu(desc->bg_free_inodes_count) < avefreei)
 218                         continue;
 219                 if (!best_desc ||
 220                     (le16_to_cpu(desc->bg_free_blocks_count) >
 221                      le16_to_cpu(best_desc->bg_free_blocks_count))) {
 222                         best_group = group;
 223                         best_desc = desc;
 224                 }
 225         }
 226         return best_group;
 227 }
 228
 229 /*
 230  * Orlov's allocator for directories.
 231  *
 232  * We always try to spread first-level directories.
 233  *
 234  * If there are blockgroups with both free inodes and free blocks counts
 235  * not worse than average we return one with smallest directory count.
 236  * Otherwise we simply return a random group.
 237  *
 238  * For the rest rules look so:
 239  *
 240  * It's OK to put directory into a group unless
 241  * it has too many directories already (max_dirs) or
 242  * it has too few free inodes left (min_inodes) or
 243  * it has too few free blocks left (min_blocks) or
 244  * it's already running too large debt (max_debt).
 245  * Parent's group is prefered, if it doesn't satisfy these
 246  * conditions we search cyclically through the rest. If none
 247  * of the groups look good we just look for a group with more
 248  * free inodes than average (starting at parent's group).
 249  *
 250  * Debt is incremented each time we allocate a directory and decremented
 251  * when we allocate an inode, within 0--255.
 252  */
 253
 254 #define INODE_COST 64
 255 #define BLOCK_COST 256
 256
 257 static int find_group_orlov(struct super_block *sb, struct inode *parent)
 258 {
 259         int parent_group = EXT3_I(parent)->i_block_group;
 260         struct ext3_sb_info *sbi = EXT3_SB(sb);
 261         struct ext3_super_block *es = sbi->s_es;
 262         int ngroups = sbi->s_groups_count;
 263         int inodes_per_group = EXT3_INODES_PER_GROUP(sb);
 264         unsigned int freei, avefreei;
 265         ext3_fsblk_t freeb, avefreeb;
 266         ext3_fsblk_t blocks_per_dir;
 267         unsigned int ndirs;
 268         int max_debt, max_dirs, min_inodes;
 269         ext3_grpblk_t min_blocks;
 270         int group = -1, i;
 271         struct ext3_group_desc *desc;
 272         struct buffer_head *bh;
 273
 274         freei = percpu_counter_read_positive(&sbi->s_freeinodes_counter);
 275         avefreei = freei / ngroups;
 276         freeb = percpu_counter_read_positive(&sbi->s_freeblocks_counter);
 277         avefreeb = freeb / ngroups;
 278         ndirs = percpu_counter_read_positive(&sbi->s_dirs_counter);
 279
 280         if ((parent == sb->s_root->d_inode) ||
 281             (EXT3_I(parent)->i_flags & EXT3_TOPDIR_FL)) {
 282                 int best_ndir = inodes_per_group;
 283                 int best_group = -1;
 284
 285                 get_random_bytes(&group, sizeof(group));
 286                 parent_group = (unsigned)group % ngroups;
 287                 for (i = 0; i < ngroups; i++) {
 288                         group = (parent_group + i) % ngroups;
 289                         desc = ext3_get_group_desc (sb, group, &bh);
 290                         if (!desc || !desc->bg_free_inodes_count)
 291                                 continue;
 292                         if (le16_to_cpu(desc->bg_used_dirs_count) >= best_ndir)
 293                                 continue;
 294                         if (le16_to_cpu(desc->bg_free_inodes_count) < avefreei)
 295                                 continue;
 296                         if (le16_to_cpu(desc->bg_free_blocks_count) < avefreeb)
 297                                 continue;
 298                         best_group = group;
 299                         best_ndir = le16_to_cpu(desc->bg_used_dirs_count);
 300                 }
 301                 if (best_group >= 0)
 302                         return best_group;
 303                 goto fallback;
 304         }
 305
 306         blocks_per_dir = (le32_to_cpu(es->s_blocks_count) - freeb) / ndirs;
 307
 308         max_dirs = ndirs / ngroups + inodes_per_group / 16;
 309         min_inodes = avefreei - inodes_per_group / 4;
 310         min_blocks = avefreeb - EXT3_BLOCKS_PER_GROUP(sb) / 4;
 311
 312         max_debt = EXT3_BLOCKS_PER_GROUP(sb) / max(blocks_per_dir, (ext3_fsblk_t)BLOCK_COST);
 313         if (max_debt * INODE_COST > inodes_per_group)
 314                 max_debt = inodes_per_group / INODE_COST;
 315         if (max_debt > 255)
 316                 max_debt = 255;
 317         if (max_debt == 0)
 318                 max_debt = 1;
 319
 320         for (i = 0; i < ngroups; i++) {
 321                 group = (parent_group + i) % ngroups;
 322                 desc = ext3_get_group_desc (sb, group, &bh);
 323                 if (!desc || !desc->bg_free_inodes_count)
 324                         continue;
 325                 if (le16_to_cpu(desc->bg_used_dirs_count) >= max_dirs)
 326                         continue;
 327                 if (le16_to_cpu(desc->bg_free_inodes_count) < min_inodes)
 328                         continue;
 329                 if (le16_to_cpu(desc->bg_free_blocks_count) < min_blocks)
 330                         continue;
 331                 return group;
 332         }
 333
 334 fallback:
 335         for (i = 0; i < ngroups; i++) {
 336                 group = (parent_group + i) % ngroups;
 337                 desc = ext3_get_group_desc (sb, group, &bh);
 338                 if (!desc || !desc->bg_free_inodes_count)
 339                         continue;
 340                 if (le16_to_cpu(desc->bg_free_inodes_count) >= avefreei)
 341                         return group;
 342         }
 343
 344         if (avefreei) {
 345                 /*
 346                  * The free-inodes counter is approximate, and for really small
 347                  * filesystems the above test can fail to find any blockgroups
 348                  */
 349                 avefreei = 0;
 350                 goto fallback;
 351         }
 352
 353         return -1;
 354 }
 355
 356 static int find_group_other(struct super_block *sb, struct inode *parent)
 357 {
 358         int parent_group = EXT3_I(parent)->i_block_group;
 359         int ngroups = EXT3_SB(sb)->s_groups_count;
 360         struct ext3_group_desc *desc;
 361         struct buffer_head *bh;
 362         int group, i;
 363
 364         /*
 365          * Try to place the inode in its parent directory
 366          */
 367         group = parent_group;
 368         desc = ext3_get_group_desc (sb, group, &bh);
 369         if (desc && le16_to_cpu(desc->bg_free_inodes_count) &&
 370                         le16_to_cpu(desc->bg_free_blocks_count))
 371                 return group;
 372
 373         /*
 374          * We're going to place this inode in a different blockgroup from its
 375          * parent.  We want to cause files in a common directory to all land in
 376          * the same blockgroup.  But we want files which are in a different
 377          * directory which shares a blockgroup with our parent to land in a
 378          * different blockgroup.
 379          *
 380          * So add our directory's i_ino into the starting point for the hash.
 381          */
 382         group = (group + parent->i_ino) % ngroups;
 383
 384         /*
 385          * Use a quadratic hash to find a group with a free inode and some free
 386          * blocks.
 387          */
 388         for (i = 1; i < ngroups; i <<= 1) {
 389                 group += i;
 390                 if (group >= ngroups)
 391                         group -= ngroups;
 392                 desc = ext3_get_group_desc (sb, group, &bh);
 393                 if (desc && le16_to_cpu(desc->bg_free_inodes_count) &&
 394                                 le16_to_cpu(desc->bg_free_blocks_count))
 395                         return group;
 396         }
 397
 398         /*
 399          * That failed: try linear search for a free inode, even if that group
 400          * has no free blocks.
 401          */
 402         group = parent_group;
 403         for (i = 0; i < ngroups; i++) {
 404                 if (++group >= ngroups)
 405                         group = 0;
 406                 desc = ext3_get_group_desc (sb, group, &bh);
 407                 if (desc && le16_to_cpu(desc->bg_free_inodes_count))
 408                         return group;
 409         }
 410
 411         return -1;
 412 }
 413
 414 /*
 415  * There are two policies for allocating an inode.  If the new inode is
 416  * a directory, then a forward search is made for a block group with both
 417  * free space and a low directory-to-inode ratio; if that fails, then of
 418  * the groups with above-average free space, that group with the fewest
 419  * directories already is chosen.
 420  *
 421  * For other inodes, search forward from the parent directory's block
 422  * group to find a free inode.
 423  */
 424 struct inode *ext3_new_inode(handle_t *handle, struct inode * dir, int mode)
 425 {
 426         struct super_block *sb;
 427         struct buffer_head *bitmap_bh = NULL;
 428         struct buffer_head *bh2;
 429         int group;
 430         unsigned long ino = 0;
 431         struct inode * inode;
 432         struct ext3_group_desc * gdp = NULL;
 433         struct ext3_super_block * es;
 434         struct ext3_inode_info *ei;
 435         struct ext3_sb_info *sbi;
 436         int err = 0;
 437         struct inode *ret;
 438         int i;
 439
 440         /* Cannot create files in a deleted directory */
 441         if (!dir || !dir->i_nlink)
 442                 return ERR_PTR(-EPERM);
 443
 444         sb = dir->i_sb;
 445         inode = new_inode(sb);
 446         if (!inode)
 447                 return ERR_PTR(-ENOMEM);
 448         ei = EXT3_I(inode);
 449
 450         sbi = EXT3_SB(sb);
 451         es = sbi->s_es;
 452         if (S_ISDIR(mode)) {
 453                 if (test_opt (sb, OLDALLOC))
 454                         group = find_group_dir(sb, dir);
 455                 else
 456                         group = find_group_orlov(sb, dir);
 457         } else
 458                 group = find_group_other(sb, dir);
 459
 460         err = -ENOSPC;
 461         if (group == -1)
 462                 goto out;
 463
 464         for (i = 0; i < sbi->s_groups_count; i++) {
 465                 err = -EIO;
 466
 467                 gdp = ext3_get_group_desc(sb, group, &bh2);
 468                 if (!gdp)
 469                         goto fail;
 470
 471                 brelse(bitmap_bh);
 472                 bitmap_bh = read_inode_bitmap(sb, group);
 473                 if (!bitmap_bh)
 474                         goto fail;
 475
 476                 ino = 0;
 477
 478 repeat_in_this_group:
 479                 ino = ext3_find_next_zero_bit((unsigned long *)
 480                                 bitmap_bh->b_data, EXT3_INODES_PER_GROUP(sb), ino);
 481                 if (ino < EXT3_INODES_PER_GROUP(sb)) {
 482
 483                         BUFFER_TRACE(bitmap_bh, "get_write_access");
 484                         err = ext3_journal_get_write_access(handle, bitmap_bh);
 485                         if (err)
 486                                 goto fail;
 487
 488                         if (!ext3_set_bit_atomic(sb_bgl_lock(sbi, group),
 489                                                 ino, bitmap_bh->b_data)) {
 490                                 /* we won it */
 491                                 BUFFER_TRACE(bitmap_bh,
 492                                         "call ext3_journal_dirty_metadata");
 493                                 err = ext3_journal_dirty_metadata(handle,
 494                                                                 bitmap_bh);
 495                                 if (err)
 496                                         goto fail;
 497                                 goto got;
 498                         }
 499                         /* we lost it */
 500                         journal_release_buffer(handle, bitmap_bh);
 501
 502                         if (++ino < EXT3_INODES_PER_GROUP(sb))
 503                                 goto repeat_in_this_group;
 504                 }
 505
 506                 /*
 507                  * This case is possible in concurrent environment.  It is very
 508                  * rare.  We cannot repeat the find_group_xxx() call because
 509                  * that will simply return the same blockgroup, because the
 510                  * group descriptor metadata has not yet been updated.
 511                  * So we just go onto the next blockgroup.
 512                  */
 513                 if (++group == sbi->s_groups_count)
 514                         group = 0;
 515         }
 516         err = -ENOSPC;
 517         goto out;
 518
 519 got:
 520         ino += group * EXT3_INODES_PER_GROUP(sb) + 1;
 521         if (ino < EXT3_FIRST_INO(sb) || ino > le32_to_cpu(es->s_inodes_count)) {
 522                 ext3_error (sb, "ext3_new_inode",
 523                             "reserved inode or inode > inodes count - "
 524                             "block_group = %d, inode=%lu", group, ino);
 525                 err = -EIO;
 526                 goto fail;
 527         }
 528
 529         BUFFER_TRACE(bh2, "get_write_access");
 530         err = ext3_journal_get_write_access(handle, bh2);
 531         if (err) goto fail;
 532         spin_lock(sb_bgl_lock(sbi, group));
 533         gdp->bg_free_inodes_count =
 534                 cpu_to_le16(le16_to_cpu(gdp->bg_free_inodes_count) - 1);
 535         if (S_ISDIR(mode)) {
 536                 gdp->bg_used_dirs_count =
 537                         cpu_to_le16(le16_to_cpu(gdp->bg_used_dirs_count) + 1);
 538         }
 539         spin_unlock(sb_bgl_lock(sbi, group));
 540         BUFFER_TRACE(bh2, "call ext3_journal_dirty_metadata");
 541         err = ext3_journal_dirty_metadata(handle, bh2);
 542         if (err) goto fail;
 543
 544         percpu_counter_dec(&sbi->s_freeinodes_counter);
 545         if (S_ISDIR(mode))
 546                 percpu_counter_inc(&sbi->s_dirs_counter);
 547         sb->s_dirt = 1;
 548
 549         inode->i_uid = current->fsuid;
 550         if (test_opt (sb, GRPID))
 551                 inode->i_gid = dir->i_gid;
 552         else if (dir->i_mode & S_ISGID) {
 553                 inode->i_gid = dir->i_gid;
 554                 if (S_ISDIR(mode))
 555                         mode |= S_ISGID;
 556         } else
 557                 inode->i_gid = current->fsgid;
 558         inode->i_mode = mode;
 559
 560         inode->i_ino = ino;
 561         /* This is the optimal IO size (for stat), not the fs block size */
 562         inode->i_blocks = 0;
 563         inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC;
 564
 565         memset(ei->i_data, 0, sizeof(ei->i_data));
 566         ei->i_dir_start_lookup = 0;
 567         ei->i_disksize = 0;
 568
 569         ei->i_flags = EXT3_I(dir)->i_flags & ~EXT3_INDEX_FL;
 570         if (S_ISLNK(mode))
 571                 ei->i_flags &= ~(EXT3_IMMUTABLE_FL|EXT3_APPEND_FL);
 572         /* dirsync only applies to directories */
 573         if (!S_ISDIR(mode))
 574                 ei->i_flags &= ~EXT3_DIRSYNC_FL;
 575 #ifdef EXT3_FRAGMENTS
 576         ei->i_faddr = 0;
 577         ei->i_frag_no = 0;
 578         ei->i_frag_size = 0;
 579 #endif
 580         ei->i_file_acl = 0;
 581         ei->i_dir_acl = 0;
 582         ei->i_dtime = 0;
 583         ei->i_block_alloc_info = NULL;
 584         ei->i_block_group = group;
 585
 586         ext3_set_inode_flags(inode);
 587         if (IS_DIRSYNC(inode))
 588                 handle->h_sync = 1;
 589         insert_inode_hash(inode);
 590         spin_lock(&sbi->s_next_gen_lock);
 591         inode->i_generation = sbi->s_next_generation++;
 592         spin_unlock(&sbi->s_next_gen_lock);
 593
 594         ei->i_state = EXT3_STATE_NEW;
 595         ei->i_extra_isize =
 596                 (EXT3_INODE_SIZE(inode->i_sb) > EXT3_GOOD_OLD_INODE_SIZE) ?
 597                 sizeof(struct ext3_inode) - EXT3_GOOD_OLD_INODE_SIZE : 0;
 598
 599         ret = inode;
 600         if(DQUOT_ALLOC_INODE(inode)) {
 601                 err = -EDQUOT;
 602                 goto fail_drop;
 603         }
 604
 605         err = ext3_init_acl(handle, inode, dir);
 606         if (err)
 607                 goto fail_free_drop;
 608
 609         err = ext3_init_security(handle,inode, dir);
 610         if (err)
 611                 goto fail_free_drop;
 612
 613         err = ext3_mark_inode_dirty(handle, inode);
 614         if (err) {
 615                 ext3_std_error(sb, err);
 616                 goto fail_free_drop;
 617         }
 618
 619         ext3_debug("allocating inode %lu\n", inode->i_ino);
 620         goto really_out;
 621 fail:
 622         ext3_std_error(sb, err);
 623 out:
 624         iput(inode);
 625         ret = ERR_PTR(err);
 626 really_out:
 627         brelse(bitmap_bh);
 628         return ret;
 629
 630 fail_free_drop:
 631         DQUOT_FREE_INODE(inode);
 632
 633 fail_drop:
 634         DQUOT_DROP(inode);
 635         inode->i_flags |= S_NOQUOTA;
 636         inode->i_nlink = 0;
 637         iput(inode);
 638         brelse(bitmap_bh);
 639         return ERR_PTR(err);
 640 }
 641
 642 /* Verify that we are loading a valid orphan from disk */
 643 struct inode *ext3_orphan_get(struct super_block *sb, unsigned long ino)
 644 {
 645         unsigned long max_ino = le32_to_cpu(EXT3_SB(sb)->s_es->s_inodes_count);
 646         unsigned long block_group;
 647         int bit;
 648         struct buffer_head *bitmap_bh = NULL;
 649         struct inode *inode = NULL;
 650
 651         /* Error cases - e2fsck has already cleaned up for us */
 652         if (ino > max_ino) {
 653                 ext3_warning(sb, __FUNCTION__,
 654                              "bad orphan ino %lu!  e2fsck was run?", ino);
 655                 goto out;
 656         }
 657
 658         block_group = (ino - 1) / EXT3_INODES_PER_GROUP(sb);
 659         bit = (ino - 1) % EXT3_INODES_PER_GROUP(sb);
 660         bitmap_bh = read_inode_bitmap(sb, block_group);
 661         if (!bitmap_bh) {
 662                 ext3_warning(sb, __FUNCTION__,
 663                              "inode bitmap error for orphan %lu", ino);
 664                 goto out;
 665         }
 666
 667         /* Having the inode bit set should be a 100% indicator that this
 668          * is a valid orphan (no e2fsck run on fs).  Orphans also include
 669          * inodes that were being truncated, so we can't check i_nlink==0.
 670          */
 671         if (!ext3_test_bit(bit, bitmap_bh->b_data) ||
 672                         !(inode = iget(sb, ino)) || is_bad_inode(inode) ||
 673                         NEXT_ORPHAN(inode) > max_ino) {
 674                 ext3_warning(sb, __FUNCTION__,
 675                              "bad orphan inode %lu!  e2fsck was run?", ino);
 676                 printk(KERN_NOTICE "ext3_test_bit(bit=%d, block=%llu) = %d\n",
 677                        bit, (unsigned long long)bitmap_bh->b_blocknr,
 678                        ext3_test_bit(bit, bitmap_bh->b_data));
 679                 printk(KERN_NOTICE "inode=%p\n", inode);
 680                 if (inode) {
 681                         printk(KERN_NOTICE "is_bad_inode(inode)=%d\n",
 682                                is_bad_inode(inode));
 683                         printk(KERN_NOTICE "NEXT_ORPHAN(inode)=%u\n",
 684                                NEXT_ORPHAN(inode));
 685                         printk(KERN_NOTICE "max_ino=%lu\n", max_ino);
 686                 }
 687                 /* Avoid freeing blocks if we got a bad deleted inode */
 688                 if (inode && inode->i_nlink == 0)
 689                         inode->i_blocks = 0;
 690                 iput(inode);
 691                 inode = NULL;
 692         }
 693 out:
 694         brelse(bitmap_bh);
 695         return inode;
 696 }
 697
 698 unsigned long ext3_count_free_inodes (struct super_block * sb)
 699 {
 700         unsigned long desc_count;
 701         struct ext3_group_desc *gdp;
 702         int i;
 703 #ifdef EXT3FS_DEBUG
 704         struct ext3_super_block *es;
 705         unsigned long bitmap_count, x;
 706         struct buffer_head *bitmap_bh = NULL;
 707
 708         es = EXT3_SB(sb)->s_es;
 709         desc_count = 0;
 710         bitmap_count = 0;
 711         gdp = NULL;
 712         for (i = 0; i < EXT3_SB(sb)->s_groups_count; i++) {
 713                 gdp = ext3_get_group_desc (sb, i, NULL);
 714                 if (!gdp)
 715                         continue;
 716                 desc_count += le16_to_cpu(gdp->bg_free_inodes_count);
 717                 brelse(bitmap_bh);
 718                 bitmap_bh = read_inode_bitmap(sb, i);
 719                 if (!bitmap_bh)
 720                         continue;
 721
 722                 x = ext3_count_free(bitmap_bh, EXT3_INODES_PER_GROUP(sb) / 8);
 723                 printk("group %d: stored = %d, counted = %lu\n",
 724                         i, le16_to_cpu(gdp->bg_free_inodes_count), x);
 725                 bitmap_count += x;
 726         }
 727         brelse(bitmap_bh);
 728         printk("ext3_count_free_inodes: stored = %u, computed = %lu, %lu\n",
 729                 le32_to_cpu(es->s_free_inodes_count), desc_count, bitmap_count);
 730         return desc_count;
 731 #else
 732         desc_count = 0;
 733         for (i = 0; i < EXT3_SB(sb)->s_groups_count; i++) {
 734                 gdp = ext3_get_group_desc (sb, i, NULL);
 735                 if (!gdp)
 736                         continue;
 737                 desc_count += le16_to_cpu(gdp->bg_free_inodes_count);
 738                 cond_resched();
 739         }
 740         return desc_count;
 741 #endif
 742 }
 743
 744 /* Called at mount-time, super-block is locked */
 745 unsigned long ext3_count_dirs (struct super_block * sb)
 746 {
 747         unsigned long count = 0;
 748         int i;
 749
 750         for (i = 0; i < EXT3_SB(sb)->s_groups_count; i++) {
 751                 struct ext3_group_desc *gdp = ext3_get_group_desc (sb, i, NULL);
 752                 if (!gdp)
 753                         continue;
 754                 count += le16_to_cpu(gdp->bg_used_dirs_count);
 755         }
 756         return count;
 757 }
 758