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ialloc.c
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1 /*
2  * linux/fs/ext3/ialloc.c
3  *
4  * Copyright (C) 1992, 1993, 1994, 1995
5  * Remy Card ([email protected])
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 ([email protected]), 1993
11  * Big-endian to little-endian byte-swapping/bitmaps by
12  * David S. Miller ([email protected]), 1995
13  */
14 
15 #include <linux/quotaops.h>
16 #include <linux/random.h>
17 
18 #include "ext3.h"
19 #include "xattr.h"
20 #include "acl.h"
21 
22 /*
23  * ialloc.c contains the inodes allocation and deallocation routines
24  */
25 
26 /*
27  * The free inodes are managed by bitmaps. A file system contains several
28  * blocks groups. Each group contains 1 bitmap block for blocks, 1 bitmap
29  * block for inodes, N blocks for the inode table and data blocks.
30  *
31  * The file system contains group descriptors which are located after the
32  * super block. Each descriptor contains the number of the bitmap block and
33  * the free blocks count in the block.
34  */
35 
36 
37 /*
38  * Read the inode allocation bitmap for a given block_group, reading
39  * into the specified slot in the superblock's bitmap cache.
40  *
41  * Return buffer_head of bitmap on success or NULL.
42  */
43 static struct buffer_head *
44 read_inode_bitmap(struct super_block * sb, unsigned long block_group)
45 {
46  struct ext3_group_desc *desc;
47  struct buffer_head *bh = NULL;
48 
49  desc = ext3_get_group_desc(sb, block_group, NULL);
50  if (!desc)
51  goto error_out;
52 
53  bh = sb_bread(sb, le32_to_cpu(desc->bg_inode_bitmap));
54  if (!bh)
55  ext3_error(sb, "read_inode_bitmap",
56  "Cannot read inode bitmap - "
57  "block_group = %lu, inode_bitmap = %u",
58  block_group, le32_to_cpu(desc->bg_inode_bitmap));
59 error_out:
60  return bh;
61 }
62 
63 /*
64  * NOTE! When we get the inode, we're the only people
65  * that have access to it, and as such there are no
66  * race conditions we have to worry about. The inode
67  * is not on the hash-lists, and it cannot be reached
68  * through the filesystem because the directory entry
69  * has been deleted earlier.
70  *
71  * HOWEVER: we must make sure that we get no aliases,
72  * which means that we have to call "clear_inode()"
73  * _before_ we mark the inode not in use in the inode
74  * bitmaps. Otherwise a newly created file might use
75  * the same inode number (not actually the same pointer
76  * though), and then we'd have two inodes sharing the
77  * same inode number and space on the harddisk.
78  */
79 void ext3_free_inode (handle_t *handle, struct inode * inode)
80 {
81  struct super_block * sb = inode->i_sb;
82  int is_directory;
83  unsigned long ino;
84  struct buffer_head *bitmap_bh = NULL;
85  struct buffer_head *bh2;
86  unsigned long block_group;
87  unsigned long bit;
88  struct ext3_group_desc * gdp;
89  struct ext3_super_block * es;
90  struct ext3_sb_info *sbi;
91  int fatal = 0, err;
92 
93  if (atomic_read(&inode->i_count) > 1) {
94  printk ("ext3_free_inode: inode has count=%d\n",
95  atomic_read(&inode->i_count));
96  return;
97  }
98  if (inode->i_nlink) {
99  printk ("ext3_free_inode: inode has nlink=%d\n",
100  inode->i_nlink);
101  return;
102  }
103  if (!sb) {
104  printk("ext3_free_inode: inode on nonexistent device\n");
105  return;
106  }
107  sbi = EXT3_SB(sb);
108 
109  ino = inode->i_ino;
110  ext3_debug ("freeing inode %lu\n", ino);
111  trace_ext3_free_inode(inode);
112 
113  is_directory = S_ISDIR(inode->i_mode);
114 
115  es = EXT3_SB(sb)->s_es;
116  if (ino < EXT3_FIRST_INO(sb) || ino > le32_to_cpu(es->s_inodes_count)) {
117  ext3_error (sb, "ext3_free_inode",
118  "reserved or nonexistent inode %lu", ino);
119  goto error_return;
120  }
121  block_group = (ino - 1) / EXT3_INODES_PER_GROUP(sb);
122  bit = (ino - 1) % EXT3_INODES_PER_GROUP(sb);
123  bitmap_bh = read_inode_bitmap(sb, block_group);
124  if (!bitmap_bh)
125  goto error_return;
126 
127  BUFFER_TRACE(bitmap_bh, "get_write_access");
128  fatal = ext3_journal_get_write_access(handle, bitmap_bh);
129  if (fatal)
130  goto error_return;
131 
132  /* Ok, now we can actually update the inode bitmaps.. */
133  if (!ext3_clear_bit_atomic(sb_bgl_lock(sbi, block_group),
134  bit, bitmap_bh->b_data))
135  ext3_error (sb, "ext3_free_inode",
136  "bit already cleared for inode %lu", ino);
137  else {
138  gdp = ext3_get_group_desc (sb, block_group, &bh2);
139 
140  BUFFER_TRACE(bh2, "get_write_access");
141  fatal = ext3_journal_get_write_access(handle, bh2);
142  if (fatal) goto error_return;
143 
144  if (gdp) {
145  spin_lock(sb_bgl_lock(sbi, block_group));
146  le16_add_cpu(&gdp->bg_free_inodes_count, 1);
147  if (is_directory)
148  le16_add_cpu(&gdp->bg_used_dirs_count, -1);
149  spin_unlock(sb_bgl_lock(sbi, block_group));
150  percpu_counter_inc(&sbi->s_freeinodes_counter);
151  if (is_directory)
152  percpu_counter_dec(&sbi->s_dirs_counter);
153 
154  }
155  BUFFER_TRACE(bh2, "call ext3_journal_dirty_metadata");
156  err = ext3_journal_dirty_metadata(handle, bh2);
157  if (!fatal) fatal = err;
158  }
159  BUFFER_TRACE(bitmap_bh, "call ext3_journal_dirty_metadata");
160  err = ext3_journal_dirty_metadata(handle, bitmap_bh);
161  if (!fatal)
162  fatal = err;
163 
164 error_return:
165  brelse(bitmap_bh);
166  ext3_std_error(sb, fatal);
167 }
168 
169 /*
170  * Orlov's allocator for directories.
171  *
172  * We always try to spread first-level directories.
173  *
174  * If there are blockgroups with both free inodes and free blocks counts
175  * not worse than average we return one with smallest directory count.
176  * Otherwise we simply return a random group.
177  *
178  * For the rest rules look so:
179  *
180  * It's OK to put directory into a group unless
181  * it has too many directories already (max_dirs) or
182  * it has too few free inodes left (min_inodes) or
183  * it has too few free blocks left (min_blocks).
184  * Parent's group is preferred, if it doesn't satisfy these
185  * conditions we search cyclically through the rest. If none
186  * of the groups look good we just look for a group with more
187  * free inodes than average (starting at parent's group).
188  *
189  * Debt is incremented each time we allocate a directory and decremented
190  * when we allocate an inode, within 0--255.
191  */
192 
193 static int find_group_orlov(struct super_block *sb, struct inode *parent)
194 {
195  int parent_group = EXT3_I(parent)->i_block_group;
196  struct ext3_sb_info *sbi = EXT3_SB(sb);
197  int ngroups = sbi->s_groups_count;
198  int inodes_per_group = EXT3_INODES_PER_GROUP(sb);
199  unsigned int freei, avefreei;
200  ext3_fsblk_t freeb, avefreeb;
201  unsigned int ndirs;
202  int max_dirs, min_inodes;
203  ext3_grpblk_t min_blocks;
204  int group = -1, i;
205  struct ext3_group_desc *desc;
206 
207  freei = percpu_counter_read_positive(&sbi->s_freeinodes_counter);
208  avefreei = freei / ngroups;
209  freeb = percpu_counter_read_positive(&sbi->s_freeblocks_counter);
210  avefreeb = freeb / ngroups;
211  ndirs = percpu_counter_read_positive(&sbi->s_dirs_counter);
212 
213  if ((parent == sb->s_root->d_inode) ||
214  (EXT3_I(parent)->i_flags & EXT3_TOPDIR_FL)) {
215  int best_ndir = inodes_per_group;
216  int best_group = -1;
217 
218  get_random_bytes(&group, sizeof(group));
219  parent_group = (unsigned)group % ngroups;
220  for (i = 0; i < ngroups; i++) {
221  group = (parent_group + i) % ngroups;
222  desc = ext3_get_group_desc (sb, group, NULL);
223  if (!desc || !desc->bg_free_inodes_count)
224  continue;
225  if (le16_to_cpu(desc->bg_used_dirs_count) >= best_ndir)
226  continue;
227  if (le16_to_cpu(desc->bg_free_inodes_count) < avefreei)
228  continue;
229  if (le16_to_cpu(desc->bg_free_blocks_count) < avefreeb)
230  continue;
231  best_group = group;
232  best_ndir = le16_to_cpu(desc->bg_used_dirs_count);
233  }
234  if (best_group >= 0)
235  return best_group;
236  goto fallback;
237  }
238 
239  max_dirs = ndirs / ngroups + inodes_per_group / 16;
240  min_inodes = avefreei - inodes_per_group / 4;
241  min_blocks = avefreeb - EXT3_BLOCKS_PER_GROUP(sb) / 4;
242 
243  for (i = 0; i < ngroups; i++) {
244  group = (parent_group + i) % ngroups;
245  desc = ext3_get_group_desc (sb, group, NULL);
246  if (!desc || !desc->bg_free_inodes_count)
247  continue;
248  if (le16_to_cpu(desc->bg_used_dirs_count) >= max_dirs)
249  continue;
250  if (le16_to_cpu(desc->bg_free_inodes_count) < min_inodes)
251  continue;
252  if (le16_to_cpu(desc->bg_free_blocks_count) < min_blocks)
253  continue;
254  return group;
255  }
256 
257 fallback:
258  for (i = 0; i < ngroups; i++) {
259  group = (parent_group + i) % ngroups;
260  desc = ext3_get_group_desc (sb, group, NULL);
261  if (!desc || !desc->bg_free_inodes_count)
262  continue;
263  if (le16_to_cpu(desc->bg_free_inodes_count) >= avefreei)
264  return group;
265  }
266 
267  if (avefreei) {
268  /*
269  * The free-inodes counter is approximate, and for really small
270  * filesystems the above test can fail to find any blockgroups
271  */
272  avefreei = 0;
273  goto fallback;
274  }
275 
276  return -1;
277 }
278 
279 static int find_group_other(struct super_block *sb, struct inode *parent)
280 {
281  int parent_group = EXT3_I(parent)->i_block_group;
282  int ngroups = EXT3_SB(sb)->s_groups_count;
283  struct ext3_group_desc *desc;
284  int group, i;
285 
286  /*
287  * Try to place the inode in its parent directory
288  */
289  group = parent_group;
290  desc = ext3_get_group_desc (sb, group, NULL);
291  if (desc && le16_to_cpu(desc->bg_free_inodes_count) &&
293  return group;
294 
295  /*
296  * We're going to place this inode in a different blockgroup from its
297  * parent. We want to cause files in a common directory to all land in
298  * the same blockgroup. But we want files which are in a different
299  * directory which shares a blockgroup with our parent to land in a
300  * different blockgroup.
301  *
302  * So add our directory's i_ino into the starting point for the hash.
303  */
304  group = (group + parent->i_ino) % ngroups;
305 
306  /*
307  * Use a quadratic hash to find a group with a free inode and some free
308  * blocks.
309  */
310  for (i = 1; i < ngroups; i <<= 1) {
311  group += i;
312  if (group >= ngroups)
313  group -= ngroups;
314  desc = ext3_get_group_desc (sb, group, NULL);
315  if (desc && le16_to_cpu(desc->bg_free_inodes_count) &&
317  return group;
318  }
319 
320  /*
321  * That failed: try linear search for a free inode, even if that group
322  * has no free blocks.
323  */
324  group = parent_group;
325  for (i = 0; i < ngroups; i++) {
326  if (++group >= ngroups)
327  group = 0;
328  desc = ext3_get_group_desc (sb, group, NULL);
329  if (desc && le16_to_cpu(desc->bg_free_inodes_count))
330  return group;
331  }
332 
333  return -1;
334 }
335 
336 /*
337  * There are two policies for allocating an inode. If the new inode is
338  * a directory, then a forward search is made for a block group with both
339  * free space and a low directory-to-inode ratio; if that fails, then of
340  * the groups with above-average free space, that group with the fewest
341  * directories already is chosen.
342  *
343  * For other inodes, search forward from the parent directory's block
344  * group to find a free inode.
345  */
346 struct inode *ext3_new_inode(handle_t *handle, struct inode * dir,
347  const struct qstr *qstr, umode_t mode)
348 {
349  struct super_block *sb;
350  struct buffer_head *bitmap_bh = NULL;
351  struct buffer_head *bh2;
352  int group;
353  unsigned long ino = 0;
354  struct inode * inode;
355  struct ext3_group_desc * gdp = NULL;
356  struct ext3_super_block * es;
357  struct ext3_inode_info *ei;
358  struct ext3_sb_info *sbi;
359  int err = 0;
360  struct inode *ret;
361  int i;
362 
363  /* Cannot create files in a deleted directory */
364  if (!dir || !dir->i_nlink)
365  return ERR_PTR(-EPERM);
366 
367  sb = dir->i_sb;
368  trace_ext3_request_inode(dir, mode);
369  inode = new_inode(sb);
370  if (!inode)
371  return ERR_PTR(-ENOMEM);
372  ei = EXT3_I(inode);
373 
374  sbi = EXT3_SB(sb);
375  es = sbi->s_es;
376  if (S_ISDIR(mode))
377  group = find_group_orlov(sb, dir);
378  else
379  group = find_group_other(sb, dir);
380 
381  err = -ENOSPC;
382  if (group == -1)
383  goto out;
384 
385  for (i = 0; i < sbi->s_groups_count; i++) {
386  err = -EIO;
387 
388  gdp = ext3_get_group_desc(sb, group, &bh2);
389  if (!gdp)
390  goto fail;
391 
392  brelse(bitmap_bh);
393  bitmap_bh = read_inode_bitmap(sb, group);
394  if (!bitmap_bh)
395  goto fail;
396 
397  ino = 0;
398 
399 repeat_in_this_group:
400  ino = ext3_find_next_zero_bit((unsigned long *)
401  bitmap_bh->b_data, EXT3_INODES_PER_GROUP(sb), ino);
402  if (ino < EXT3_INODES_PER_GROUP(sb)) {
403 
404  BUFFER_TRACE(bitmap_bh, "get_write_access");
405  err = ext3_journal_get_write_access(handle, bitmap_bh);
406  if (err)
407  goto fail;
408 
409  if (!ext3_set_bit_atomic(sb_bgl_lock(sbi, group),
410  ino, bitmap_bh->b_data)) {
411  /* we won it */
412  BUFFER_TRACE(bitmap_bh,
413  "call ext3_journal_dirty_metadata");
414  err = ext3_journal_dirty_metadata(handle,
415  bitmap_bh);
416  if (err)
417  goto fail;
418  goto got;
419  }
420  /* we lost it */
421  journal_release_buffer(handle, bitmap_bh);
422 
423  if (++ino < EXT3_INODES_PER_GROUP(sb))
424  goto repeat_in_this_group;
425  }
426 
427  /*
428  * This case is possible in concurrent environment. It is very
429  * rare. We cannot repeat the find_group_xxx() call because
430  * that will simply return the same blockgroup, because the
431  * group descriptor metadata has not yet been updated.
432  * So we just go onto the next blockgroup.
433  */
434  if (++group == sbi->s_groups_count)
435  group = 0;
436  }
437  err = -ENOSPC;
438  goto out;
439 
440 got:
441  ino += group * EXT3_INODES_PER_GROUP(sb) + 1;
442  if (ino < EXT3_FIRST_INO(sb) || ino > le32_to_cpu(es->s_inodes_count)) {
443  ext3_error (sb, "ext3_new_inode",
444  "reserved inode or inode > inodes count - "
445  "block_group = %d, inode=%lu", group, ino);
446  err = -EIO;
447  goto fail;
448  }
449 
450  BUFFER_TRACE(bh2, "get_write_access");
451  err = ext3_journal_get_write_access(handle, bh2);
452  if (err) goto fail;
453  spin_lock(sb_bgl_lock(sbi, group));
454  le16_add_cpu(&gdp->bg_free_inodes_count, -1);
455  if (S_ISDIR(mode)) {
456  le16_add_cpu(&gdp->bg_used_dirs_count, 1);
457  }
458  spin_unlock(sb_bgl_lock(sbi, group));
459  BUFFER_TRACE(bh2, "call ext3_journal_dirty_metadata");
460  err = ext3_journal_dirty_metadata(handle, bh2);
461  if (err) goto fail;
462 
463  percpu_counter_dec(&sbi->s_freeinodes_counter);
464  if (S_ISDIR(mode))
465  percpu_counter_inc(&sbi->s_dirs_counter);
466 
467 
468  if (test_opt(sb, GRPID)) {
469  inode->i_mode = mode;
470  inode->i_uid = current_fsuid();
471  inode->i_gid = dir->i_gid;
472  } else
473  inode_init_owner(inode, dir, mode);
474 
475  inode->i_ino = ino;
476  /* This is the optimal IO size (for stat), not the fs block size */
477  inode->i_blocks = 0;
478  inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC;
479 
480  memset(ei->i_data, 0, sizeof(ei->i_data));
481  ei->i_dir_start_lookup = 0;
482  ei->i_disksize = 0;
483 
484  ei->i_flags =
485  ext3_mask_flags(mode, EXT3_I(dir)->i_flags & EXT3_FL_INHERITED);
486 #ifdef EXT3_FRAGMENTS
487  ei->i_faddr = 0;
488  ei->i_frag_no = 0;
489  ei->i_frag_size = 0;
490 #endif
491  ei->i_file_acl = 0;
492  ei->i_dir_acl = 0;
493  ei->i_dtime = 0;
494  ei->i_block_alloc_info = NULL;
495  ei->i_block_group = group;
496 
497  ext3_set_inode_flags(inode);
498  if (IS_DIRSYNC(inode))
499  handle->h_sync = 1;
500  if (insert_inode_locked(inode) < 0) {
501  /*
502  * Likely a bitmap corruption causing inode to be allocated
503  * twice.
504  */
505  err = -EIO;
506  goto fail;
507  }
508  spin_lock(&sbi->s_next_gen_lock);
509  inode->i_generation = sbi->s_next_generation++;
510  spin_unlock(&sbi->s_next_gen_lock);
511 
512  ei->i_state_flags = 0;
513  ext3_set_inode_state(inode, EXT3_STATE_NEW);
514 
515  /* See comment in ext3_iget for explanation */
516  if (ino >= EXT3_FIRST_INO(sb) + 1 &&
518  ei->i_extra_isize =
519  sizeof(struct ext3_inode) - EXT3_GOOD_OLD_INODE_SIZE;
520  } else {
521  ei->i_extra_isize = 0;
522  }
523 
524  ret = inode;
525  dquot_initialize(inode);
526  err = dquot_alloc_inode(inode);
527  if (err)
528  goto fail_drop;
529 
530  err = ext3_init_acl(handle, inode, dir);
531  if (err)
532  goto fail_free_drop;
533 
534  err = ext3_init_security(handle, inode, dir, qstr);
535  if (err)
536  goto fail_free_drop;
537 
538  err = ext3_mark_inode_dirty(handle, inode);
539  if (err) {
540  ext3_std_error(sb, err);
541  goto fail_free_drop;
542  }
543 
544  ext3_debug("allocating inode %lu\n", inode->i_ino);
545  trace_ext3_allocate_inode(inode, dir, mode);
546  goto really_out;
547 fail:
548  ext3_std_error(sb, err);
549 out:
550  iput(inode);
551  ret = ERR_PTR(err);
552 really_out:
553  brelse(bitmap_bh);
554  return ret;
555 
556 fail_free_drop:
557  dquot_free_inode(inode);
558 
559 fail_drop:
560  dquot_drop(inode);
561  inode->i_flags |= S_NOQUOTA;
562  clear_nlink(inode);
563  unlock_new_inode(inode);
564  iput(inode);
565  brelse(bitmap_bh);
566  return ERR_PTR(err);
567 }
568 
569 /* Verify that we are loading a valid orphan from disk */
570 struct inode *ext3_orphan_get(struct super_block *sb, unsigned long ino)
571 {
572  unsigned long max_ino = le32_to_cpu(EXT3_SB(sb)->s_es->s_inodes_count);
573  unsigned long block_group;
574  int bit;
575  struct buffer_head *bitmap_bh;
576  struct inode *inode = NULL;
577  long err = -EIO;
578 
579  /* Error cases - e2fsck has already cleaned up for us */
580  if (ino > max_ino) {
581  ext3_warning(sb, __func__,
582  "bad orphan ino %lu! e2fsck was run?", ino);
583  goto error;
584  }
585 
586  block_group = (ino - 1) / EXT3_INODES_PER_GROUP(sb);
587  bit = (ino - 1) % EXT3_INODES_PER_GROUP(sb);
588  bitmap_bh = read_inode_bitmap(sb, block_group);
589  if (!bitmap_bh) {
590  ext3_warning(sb, __func__,
591  "inode bitmap error for orphan %lu", ino);
592  goto error;
593  }
594 
595  /* Having the inode bit set should be a 100% indicator that this
596  * is a valid orphan (no e2fsck run on fs). Orphans also include
597  * inodes that were being truncated, so we can't check i_nlink==0.
598  */
599  if (!ext3_test_bit(bit, bitmap_bh->b_data))
600  goto bad_orphan;
601 
602  inode = ext3_iget(sb, ino);
603  if (IS_ERR(inode))
604  goto iget_failed;
605 
606  /*
607  * If the orphans has i_nlinks > 0 then it should be able to be
608  * truncated, otherwise it won't be removed from the orphan list
609  * during processing and an infinite loop will result.
610  */
611  if (inode->i_nlink && !ext3_can_truncate(inode))
612  goto bad_orphan;
613 
614  if (NEXT_ORPHAN(inode) > max_ino)
615  goto bad_orphan;
616  brelse(bitmap_bh);
617  return inode;
618 
620  err = PTR_ERR(inode);
621  inode = NULL;
622 bad_orphan:
623  ext3_warning(sb, __func__,
624  "bad orphan inode %lu! e2fsck was run?", ino);
625  printk(KERN_NOTICE "ext3_test_bit(bit=%d, block=%llu) = %d\n",
626  bit, (unsigned long long)bitmap_bh->b_blocknr,
627  ext3_test_bit(bit, bitmap_bh->b_data));
628  printk(KERN_NOTICE "inode=%p\n", inode);
629  if (inode) {
630  printk(KERN_NOTICE "is_bad_inode(inode)=%d\n",
631  is_bad_inode(inode));
632  printk(KERN_NOTICE "NEXT_ORPHAN(inode)=%u\n",
633  NEXT_ORPHAN(inode));
634  printk(KERN_NOTICE "max_ino=%lu\n", max_ino);
635  printk(KERN_NOTICE "i_nlink=%u\n", inode->i_nlink);
636  /* Avoid freeing blocks if we got a bad deleted inode */
637  if (inode->i_nlink == 0)
638  inode->i_blocks = 0;
639  iput(inode);
640  }
641  brelse(bitmap_bh);
642 error:
643  return ERR_PTR(err);
644 }
645 
646 unsigned long ext3_count_free_inodes (struct super_block * sb)
647 {
648  unsigned long desc_count;
649  struct ext3_group_desc *gdp;
650  int i;
651 #ifdef EXT3FS_DEBUG
652  struct ext3_super_block *es;
653  unsigned long bitmap_count, x;
654  struct buffer_head *bitmap_bh = NULL;
655 
656  es = EXT3_SB(sb)->s_es;
657  desc_count = 0;
658  bitmap_count = 0;
659  gdp = NULL;
660  for (i = 0; i < EXT3_SB(sb)->s_groups_count; i++) {
661  gdp = ext3_get_group_desc (sb, i, NULL);
662  if (!gdp)
663  continue;
664  desc_count += le16_to_cpu(gdp->bg_free_inodes_count);
665  brelse(bitmap_bh);
666  bitmap_bh = read_inode_bitmap(sb, i);
667  if (!bitmap_bh)
668  continue;
669 
670  x = ext3_count_free(bitmap_bh, EXT3_INODES_PER_GROUP(sb) / 8);
671  printk("group %d: stored = %d, counted = %lu\n",
672  i, le16_to_cpu(gdp->bg_free_inodes_count), x);
673  bitmap_count += x;
674  }
675  brelse(bitmap_bh);
676  printk("ext3_count_free_inodes: stored = %u, computed = %lu, %lu\n",
677  le32_to_cpu(es->s_free_inodes_count), desc_count, bitmap_count);
678  return desc_count;
679 #else
680  desc_count = 0;
681  for (i = 0; i < EXT3_SB(sb)->s_groups_count; i++) {
682  gdp = ext3_get_group_desc (sb, i, NULL);
683  if (!gdp)
684  continue;
685  desc_count += le16_to_cpu(gdp->bg_free_inodes_count);
686  cond_resched();
687  }
688  return desc_count;
689 #endif
690 }
691 
692 /* Called at mount-time, super-block is locked */
693 unsigned long ext3_count_dirs (struct super_block * sb)
694 {
695  unsigned long count = 0;
696  int i;
697 
698  for (i = 0; i < EXT3_SB(sb)->s_groups_count; i++) {
699  struct ext3_group_desc *gdp = ext3_get_group_desc (sb, i, NULL);
700  if (!gdp)
701  continue;
702  count += le16_to_cpu(gdp->bg_used_dirs_count);
703  }
704  return count;
705 }
706