blob: dc826464f313d884a55276786a0a7aed008fe711 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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 */
53static struct buffer_head *
54read_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));
69error_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 */
89void 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;
187error_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 */
202static int find_group_dir(struct super_block *sb, struct inode *parent)
203{
204 int ngroups = EXT3_SB(sb)->s_groups_count;
205 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
257static 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 int freei, avefreei;
265 int freeb, avefreeb;
266 int blocks_per_dir, ndirs;
267 int max_debt, max_dirs, min_blocks, min_inodes;
268 int group = -1, i;
269 struct ext3_group_desc *desc;
270 struct buffer_head *bh;
271
272 freei = percpu_counter_read_positive(&sbi->s_freeinodes_counter);
273 avefreei = freei / ngroups;
274 freeb = percpu_counter_read_positive(&sbi->s_freeblocks_counter);
275 avefreeb = freeb / ngroups;
276 ndirs = percpu_counter_read_positive(&sbi->s_dirs_counter);
277
278 if ((parent == sb->s_root->d_inode) ||
279 (EXT3_I(parent)->i_flags & EXT3_TOPDIR_FL)) {
280 int best_ndir = inodes_per_group;
281 int best_group = -1;
282
283 get_random_bytes(&group, sizeof(group));
284 parent_group = (unsigned)group % ngroups;
285 for (i = 0; i < ngroups; i++) {
286 group = (parent_group + i) % ngroups;
287 desc = ext3_get_group_desc (sb, group, &bh);
288 if (!desc || !desc->bg_free_inodes_count)
289 continue;
290 if (le16_to_cpu(desc->bg_used_dirs_count) >= best_ndir)
291 continue;
292 if (le16_to_cpu(desc->bg_free_inodes_count) < avefreei)
293 continue;
294 if (le16_to_cpu(desc->bg_free_blocks_count) < avefreeb)
295 continue;
296 best_group = group;
297 best_ndir = le16_to_cpu(desc->bg_used_dirs_count);
298 }
299 if (best_group >= 0)
300 return best_group;
301 goto fallback;
302 }
303
304 blocks_per_dir = (le32_to_cpu(es->s_blocks_count) - freeb) / ndirs;
305
306 max_dirs = ndirs / ngroups + inodes_per_group / 16;
307 min_inodes = avefreei - inodes_per_group / 4;
308 min_blocks = avefreeb - EXT3_BLOCKS_PER_GROUP(sb) / 4;
309
310 max_debt = EXT3_BLOCKS_PER_GROUP(sb) / max(blocks_per_dir, BLOCK_COST);
311 if (max_debt * INODE_COST > inodes_per_group)
312 max_debt = inodes_per_group / INODE_COST;
313 if (max_debt > 255)
314 max_debt = 255;
315 if (max_debt == 0)
316 max_debt = 1;
317
318 for (i = 0; i < ngroups; i++) {
319 group = (parent_group + i) % ngroups;
320 desc = ext3_get_group_desc (sb, group, &bh);
321 if (!desc || !desc->bg_free_inodes_count)
322 continue;
323 if (le16_to_cpu(desc->bg_used_dirs_count) >= max_dirs)
324 continue;
325 if (le16_to_cpu(desc->bg_free_inodes_count) < min_inodes)
326 continue;
327 if (le16_to_cpu(desc->bg_free_blocks_count) < min_blocks)
328 continue;
329 return group;
330 }
331
332fallback:
333 for (i = 0; i < ngroups; i++) {
334 group = (parent_group + i) % ngroups;
335 desc = ext3_get_group_desc (sb, group, &bh);
336 if (!desc || !desc->bg_free_inodes_count)
337 continue;
338 if (le16_to_cpu(desc->bg_free_inodes_count) >= avefreei)
339 return group;
340 }
341
342 if (avefreei) {
343 /*
344 * The free-inodes counter is approximate, and for really small
345 * filesystems the above test can fail to find any blockgroups
346 */
347 avefreei = 0;
348 goto fallback;
349 }
350
351 return -1;
352}
353
354static int find_group_other(struct super_block *sb, struct inode *parent)
355{
356 int parent_group = EXT3_I(parent)->i_block_group;
357 int ngroups = EXT3_SB(sb)->s_groups_count;
358 struct ext3_group_desc *desc;
359 struct buffer_head *bh;
360 int group, i;
361
362 /*
363 * Try to place the inode in its parent directory
364 */
365 group = parent_group;
366 desc = ext3_get_group_desc (sb, group, &bh);
367 if (desc && le16_to_cpu(desc->bg_free_inodes_count) &&
368 le16_to_cpu(desc->bg_free_blocks_count))
369 return group;
370
371 /*
372 * We're going to place this inode in a different blockgroup from its
373 * parent. We want to cause files in a common directory to all land in
374 * the same blockgroup. But we want files which are in a different
375 * directory which shares a blockgroup with our parent to land in a
376 * different blockgroup.
377 *
378 * So add our directory's i_ino into the starting point for the hash.
379 */
380 group = (group + parent->i_ino) % ngroups;
381
382 /*
383 * Use a quadratic hash to find a group with a free inode and some free
384 * blocks.
385 */
386 for (i = 1; i < ngroups; i <<= 1) {
387 group += i;
388 if (group >= ngroups)
389 group -= ngroups;
390 desc = ext3_get_group_desc (sb, group, &bh);
391 if (desc && le16_to_cpu(desc->bg_free_inodes_count) &&
392 le16_to_cpu(desc->bg_free_blocks_count))
393 return group;
394 }
395
396 /*
397 * That failed: try linear search for a free inode, even if that group
398 * has no free blocks.
399 */
400 group = parent_group;
401 for (i = 0; i < ngroups; i++) {
402 if (++group >= ngroups)
403 group = 0;
404 desc = ext3_get_group_desc (sb, group, &bh);
405 if (desc && le16_to_cpu(desc->bg_free_inodes_count))
406 return group;
407 }
408
409 return -1;
410}
411
412/*
413 * There are two policies for allocating an inode. If the new inode is
414 * a directory, then a forward search is made for a block group with both
415 * free space and a low directory-to-inode ratio; if that fails, then of
416 * the groups with above-average free space, that group with the fewest
417 * directories already is chosen.
418 *
419 * For other inodes, search forward from the parent directory's block
420 * group to find a free inode.
421 */
422struct inode *ext3_new_inode(handle_t *handle, struct inode * dir, int mode)
423{
424 struct super_block *sb;
425 struct buffer_head *bitmap_bh = NULL;
426 struct buffer_head *bh2;
427 int group;
428 unsigned long ino = 0;
429 struct inode * inode;
430 struct ext3_group_desc * gdp = NULL;
431 struct ext3_super_block * es;
432 struct ext3_inode_info *ei;
433 struct ext3_sb_info *sbi;
434 int err = 0;
435 struct inode *ret;
436 int i;
437
438 /* Cannot create files in a deleted directory */
439 if (!dir || !dir->i_nlink)
440 return ERR_PTR(-EPERM);
441
442 sb = dir->i_sb;
443 inode = new_inode(sb);
444 if (!inode)
445 return ERR_PTR(-ENOMEM);
446 ei = EXT3_I(inode);
447
448 sbi = EXT3_SB(sb);
449 es = sbi->s_es;
450 if (S_ISDIR(mode)) {
451 if (test_opt (sb, OLDALLOC))
452 group = find_group_dir(sb, dir);
453 else
454 group = find_group_orlov(sb, dir);
455 } else
456 group = find_group_other(sb, dir);
457
458 err = -ENOSPC;
459 if (group == -1)
460 goto out;
461
462 for (i = 0; i < sbi->s_groups_count; i++) {
463 err = -EIO;
464
465 gdp = ext3_get_group_desc(sb, group, &bh2);
466 if (!gdp)
467 goto fail;
468
469 brelse(bitmap_bh);
470 bitmap_bh = read_inode_bitmap(sb, group);
471 if (!bitmap_bh)
472 goto fail;
473
474 ino = 0;
475
476repeat_in_this_group:
477 ino = ext3_find_next_zero_bit((unsigned long *)
478 bitmap_bh->b_data, EXT3_INODES_PER_GROUP(sb), ino);
479 if (ino < EXT3_INODES_PER_GROUP(sb)) {
480
481 BUFFER_TRACE(bitmap_bh, "get_write_access");
482 err = ext3_journal_get_write_access(handle, bitmap_bh);
483 if (err)
484 goto fail;
485
486 if (!ext3_set_bit_atomic(sb_bgl_lock(sbi, group),
487 ino, bitmap_bh->b_data)) {
488 /* we won it */
489 BUFFER_TRACE(bitmap_bh,
490 "call ext3_journal_dirty_metadata");
491 err = ext3_journal_dirty_metadata(handle,
492 bitmap_bh);
493 if (err)
494 goto fail;
495 goto got;
496 }
497 /* we lost it */
498 journal_release_buffer(handle, bitmap_bh);
499
500 if (++ino < EXT3_INODES_PER_GROUP(sb))
501 goto repeat_in_this_group;
502 }
503
504 /*
505 * This case is possible in concurrent environment. It is very
506 * rare. We cannot repeat the find_group_xxx() call because
507 * that will simply return the same blockgroup, because the
508 * group descriptor metadata has not yet been updated.
509 * So we just go onto the next blockgroup.
510 */
511 if (++group == sbi->s_groups_count)
512 group = 0;
513 }
514 err = -ENOSPC;
515 goto out;
516
517got:
518 ino += group * EXT3_INODES_PER_GROUP(sb) + 1;
519 if (ino < EXT3_FIRST_INO(sb) || ino > le32_to_cpu(es->s_inodes_count)) {
520 ext3_error (sb, "ext3_new_inode",
521 "reserved inode or inode > inodes count - "
522 "block_group = %d, inode=%lu", group, ino);
523 err = -EIO;
524 goto fail;
525 }
526
527 BUFFER_TRACE(bh2, "get_write_access");
528 err = ext3_journal_get_write_access(handle, bh2);
529 if (err) goto fail;
530 spin_lock(sb_bgl_lock(sbi, group));
531 gdp->bg_free_inodes_count =
532 cpu_to_le16(le16_to_cpu(gdp->bg_free_inodes_count) - 1);
533 if (S_ISDIR(mode)) {
534 gdp->bg_used_dirs_count =
535 cpu_to_le16(le16_to_cpu(gdp->bg_used_dirs_count) + 1);
536 }
537 spin_unlock(sb_bgl_lock(sbi, group));
538 BUFFER_TRACE(bh2, "call ext3_journal_dirty_metadata");
539 err = ext3_journal_dirty_metadata(handle, bh2);
540 if (err) goto fail;
541
542 percpu_counter_dec(&sbi->s_freeinodes_counter);
543 if (S_ISDIR(mode))
544 percpu_counter_inc(&sbi->s_dirs_counter);
545 sb->s_dirt = 1;
546
547 inode->i_uid = current->fsuid;
548 if (test_opt (sb, GRPID))
549 inode->i_gid = dir->i_gid;
550 else if (dir->i_mode & S_ISGID) {
551 inode->i_gid = dir->i_gid;
552 if (S_ISDIR(mode))
553 mode |= S_ISGID;
554 } else
555 inode->i_gid = current->fsgid;
556 inode->i_mode = mode;
557
558 inode->i_ino = ino;
559 /* This is the optimal IO size (for stat), not the fs block size */
560 inode->i_blksize = PAGE_SIZE;
561 inode->i_blocks = 0;
562 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC;
563
564 memset(ei->i_data, 0, sizeof(ei->i_data));
565 ei->i_dir_start_lookup = 0;
566 ei->i_disksize = 0;
567
568 ei->i_flags = EXT3_I(dir)->i_flags & ~EXT3_INDEX_FL;
569 if (S_ISLNK(mode))
570 ei->i_flags &= ~(EXT3_IMMUTABLE_FL|EXT3_APPEND_FL);
571 /* dirsync only applies to directories */
572 if (!S_ISDIR(mode))
573 ei->i_flags &= ~EXT3_DIRSYNC_FL;
574#ifdef EXT3_FRAGMENTS
575 ei->i_faddr = 0;
576 ei->i_frag_no = 0;
577 ei->i_frag_size = 0;
578#endif
579 ei->i_file_acl = 0;
580 ei->i_dir_acl = 0;
581 ei->i_dtime = 0;
582 ei->i_block_alloc_info = NULL;
583 ei->i_block_group = group;
584
585 ext3_set_inode_flags(inode);
586 if (IS_DIRSYNC(inode))
587 handle->h_sync = 1;
588 insert_inode_hash(inode);
589 spin_lock(&sbi->s_next_gen_lock);
590 inode->i_generation = sbi->s_next_generation++;
591 spin_unlock(&sbi->s_next_gen_lock);
592
593 ei->i_state = EXT3_STATE_NEW;
594 ei->i_extra_isize =
595 (EXT3_INODE_SIZE(inode->i_sb) > EXT3_GOOD_OLD_INODE_SIZE) ?
596 sizeof(struct ext3_inode) - EXT3_GOOD_OLD_INODE_SIZE : 0;
597
598 ret = inode;
599 if(DQUOT_ALLOC_INODE(inode)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700600 err = -EDQUOT;
Chris Sykesdc7b5fd2005-09-27 21:45:23 -0700601 goto fail_drop;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700602 }
Chris Sykesdc7b5fd2005-09-27 21:45:23 -0700603
Linus Torvalds1da177e2005-04-16 15:20:36 -0700604 err = ext3_init_acl(handle, inode, dir);
Chris Sykesdc7b5fd2005-09-27 21:45:23 -0700605 if (err)
606 goto fail_free_drop;
607
Stephen Smalleyac509602005-09-09 13:01:41 -0700608 err = ext3_init_security(handle,inode, dir);
Chris Sykesdc7b5fd2005-09-27 21:45:23 -0700609 if (err)
610 goto fail_free_drop;
611
Linus Torvalds1da177e2005-04-16 15:20:36 -0700612 err = ext3_mark_inode_dirty(handle, inode);
613 if (err) {
614 ext3_std_error(sb, err);
Chris Sykesdc7b5fd2005-09-27 21:45:23 -0700615 goto fail_free_drop;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700616 }
617
618 ext3_debug("allocating inode %lu\n", inode->i_ino);
619 goto really_out;
620fail:
621 ext3_std_error(sb, err);
622out:
623 iput(inode);
624 ret = ERR_PTR(err);
625really_out:
626 brelse(bitmap_bh);
627 return ret;
628
Chris Sykesdc7b5fd2005-09-27 21:45:23 -0700629fail_free_drop:
630 DQUOT_FREE_INODE(inode);
631
632fail_drop:
633 DQUOT_DROP(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700634 inode->i_flags |= S_NOQUOTA;
635 inode->i_nlink = 0;
636 iput(inode);
637 brelse(bitmap_bh);
638 return ERR_PTR(err);
639}
640
641/* Verify that we are loading a valid orphan from disk */
642struct inode *ext3_orphan_get(struct super_block *sb, unsigned long ino)
643{
644 unsigned long max_ino = le32_to_cpu(EXT3_SB(sb)->s_es->s_inodes_count);
645 unsigned long block_group;
646 int bit;
647 struct buffer_head *bitmap_bh = NULL;
648 struct inode *inode = NULL;
649
650 /* Error cases - e2fsck has already cleaned up for us */
651 if (ino > max_ino) {
652 ext3_warning(sb, __FUNCTION__,
Glauber de Oliveira Costa9f406682006-01-08 01:03:22 -0800653 "bad orphan ino %lu! e2fsck was run?", ino);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700654 goto out;
655 }
656
657 block_group = (ino - 1) / EXT3_INODES_PER_GROUP(sb);
658 bit = (ino - 1) % EXT3_INODES_PER_GROUP(sb);
659 bitmap_bh = read_inode_bitmap(sb, block_group);
660 if (!bitmap_bh) {
661 ext3_warning(sb, __FUNCTION__,
Glauber de Oliveira Costa9f406682006-01-08 01:03:22 -0800662 "inode bitmap error for orphan %lu", ino);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700663 goto out;
664 }
665
666 /* Having the inode bit set should be a 100% indicator that this
667 * is a valid orphan (no e2fsck run on fs). Orphans also include
668 * inodes that were being truncated, so we can't check i_nlink==0.
669 */
670 if (!ext3_test_bit(bit, bitmap_bh->b_data) ||
671 !(inode = iget(sb, ino)) || is_bad_inode(inode) ||
672 NEXT_ORPHAN(inode) > max_ino) {
673 ext3_warning(sb, __FUNCTION__,
Glauber de Oliveira Costa9f406682006-01-08 01:03:22 -0800674 "bad orphan inode %lu! e2fsck was run?", ino);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700675 printk(KERN_NOTICE "ext3_test_bit(bit=%d, block=%llu) = %d\n",
676 bit, (unsigned long long)bitmap_bh->b_blocknr,
677 ext3_test_bit(bit, bitmap_bh->b_data));
678 printk(KERN_NOTICE "inode=%p\n", inode);
679 if (inode) {
680 printk(KERN_NOTICE "is_bad_inode(inode)=%d\n",
681 is_bad_inode(inode));
682 printk(KERN_NOTICE "NEXT_ORPHAN(inode)=%u\n",
683 NEXT_ORPHAN(inode));
684 printk(KERN_NOTICE "max_ino=%lu\n", max_ino);
685 }
686 /* Avoid freeing blocks if we got a bad deleted inode */
687 if (inode && inode->i_nlink == 0)
688 inode->i_blocks = 0;
689 iput(inode);
690 inode = NULL;
691 }
692out:
693 brelse(bitmap_bh);
694 return inode;
695}
696
697unsigned long ext3_count_free_inodes (struct super_block * sb)
698{
699 unsigned long desc_count;
700 struct ext3_group_desc *gdp;
701 int i;
702#ifdef EXT3FS_DEBUG
703 struct ext3_super_block *es;
704 unsigned long bitmap_count, x;
705 struct buffer_head *bitmap_bh = NULL;
706
Linus Torvalds1da177e2005-04-16 15:20:36 -0700707 es = EXT3_SB(sb)->s_es;
708 desc_count = 0;
709 bitmap_count = 0;
710 gdp = NULL;
711 for (i = 0; i < EXT3_SB(sb)->s_groups_count; i++) {
712 gdp = ext3_get_group_desc (sb, i, NULL);
713 if (!gdp)
714 continue;
715 desc_count += le16_to_cpu(gdp->bg_free_inodes_count);
716 brelse(bitmap_bh);
717 bitmap_bh = read_inode_bitmap(sb, i);
718 if (!bitmap_bh)
719 continue;
720
721 x = ext3_count_free(bitmap_bh, EXT3_INODES_PER_GROUP(sb) / 8);
722 printk("group %d: stored = %d, counted = %lu\n",
723 i, le16_to_cpu(gdp->bg_free_inodes_count), x);
724 bitmap_count += x;
725 }
726 brelse(bitmap_bh);
727 printk("ext3_count_free_inodes: stored = %u, computed = %lu, %lu\n",
728 le32_to_cpu(es->s_free_inodes_count), desc_count, bitmap_count);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700729 return desc_count;
730#else
731 desc_count = 0;
732 for (i = 0; i < EXT3_SB(sb)->s_groups_count; i++) {
733 gdp = ext3_get_group_desc (sb, i, NULL);
734 if (!gdp)
735 continue;
736 desc_count += le16_to_cpu(gdp->bg_free_inodes_count);
737 cond_resched();
738 }
739 return desc_count;
740#endif
741}
742
743/* Called at mount-time, super-block is locked */
744unsigned long ext3_count_dirs (struct super_block * sb)
745{
746 unsigned long count = 0;
747 int i;
748
749 for (i = 0; i < EXT3_SB(sb)->s_groups_count; i++) {
750 struct ext3_group_desc *gdp = ext3_get_group_desc (sb, i, NULL);
751 if (!gdp)
752 continue;
753 count += le16_to_cpu(gdp->bg_used_dirs_count);
754 }
755 return count;
756}
757