blob: 47b678d73e7a53d28ef1d0d35eae758bd87e54d7 [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));
Marcin Slusarz50e8a282008-02-08 04:20:13 -0800167 le16_add_cpu(&gdp->bg_free_inodes_count, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168 if (is_directory)
Marcin Slusarz50e8a282008-02-08 04:20:13 -0800169 le16_add_cpu(&gdp->bg_used_dirs_count, -1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170 spin_unlock(sb_bgl_lock(sbi, block_group));
171 percpu_counter_inc(&sbi->s_freeinodes_counter);
172 if (is_directory)
173 percpu_counter_dec(&sbi->s_dirs_counter);
174
175 }
176 BUFFER_TRACE(bh2, "call ext3_journal_dirty_metadata");
177 err = ext3_journal_dirty_metadata(handle, bh2);
178 if (!fatal) fatal = err;
179 }
180 BUFFER_TRACE(bitmap_bh, "call ext3_journal_dirty_metadata");
181 err = ext3_journal_dirty_metadata(handle, bitmap_bh);
182 if (!fatal)
183 fatal = err;
184 sb->s_dirt = 1;
185error_return:
186 brelse(bitmap_bh);
187 ext3_std_error(sb, fatal);
188}
189
190/*
191 * There are two policies for allocating an inode. If the new inode is
192 * a directory, then a forward search is made for a block group with both
193 * free space and a low directory-to-inode ratio; if that fails, then of
194 * the groups with above-average free space, that group with the fewest
195 * directories already is chosen.
196 *
197 * For other inodes, search forward from the parent directory\'s block
198 * group to find a free inode.
199 */
200static int find_group_dir(struct super_block *sb, struct inode *parent)
201{
202 int ngroups = EXT3_SB(sb)->s_groups_count;
Eric Sandeeneee194e2006-09-27 01:49:30 -0700203 unsigned int freei, avefreei;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204 struct ext3_group_desc *desc, *best_desc = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205 int group, best_group = -1;
206
207 freei = percpu_counter_read_positive(&EXT3_SB(sb)->s_freeinodes_counter);
208 avefreei = freei / ngroups;
209
210 for (group = 0; group < ngroups; group++) {
Eric Sandeenef2fb672007-10-16 23:26:30 -0700211 desc = ext3_get_group_desc (sb, group, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212 if (!desc || !desc->bg_free_inodes_count)
213 continue;
214 if (le16_to_cpu(desc->bg_free_inodes_count) < avefreei)
215 continue;
Mingming Caoae6ddcc2006-09-27 01:49:27 -0700216 if (!best_desc ||
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217 (le16_to_cpu(desc->bg_free_blocks_count) >
218 le16_to_cpu(best_desc->bg_free_blocks_count))) {
219 best_group = group;
220 best_desc = desc;
221 }
222 }
223 return best_group;
224}
225
Mingming Caoae6ddcc2006-09-27 01:49:27 -0700226/*
227 * Orlov's allocator for directories.
228 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229 * We always try to spread first-level directories.
230 *
Mingming Caoae6ddcc2006-09-27 01:49:27 -0700231 * If there are blockgroups with both free inodes and free blocks counts
232 * not worse than average we return one with smallest directory count.
233 * Otherwise we simply return a random group.
234 *
235 * For the rest rules look so:
236 *
237 * It's OK to put directory into a group unless
238 * it has too many directories already (max_dirs) or
239 * it has too few free inodes left (min_inodes) or
240 * it has too few free blocks left (min_blocks) or
241 * it's already running too large debt (max_debt).
Benoit Boissinot1cc8dcf2008-04-21 22:45:55 +0000242 * Parent's group is preferred, if it doesn't satisfy these
Mingming Caoae6ddcc2006-09-27 01:49:27 -0700243 * conditions we search cyclically through the rest. If none
244 * of the groups look good we just look for a group with more
245 * free inodes than average (starting at parent's group).
246 *
247 * Debt is incremented each time we allocate a directory and decremented
248 * when we allocate an inode, within 0--255.
249 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250
251#define INODE_COST 64
252#define BLOCK_COST 256
253
254static int find_group_orlov(struct super_block *sb, struct inode *parent)
255{
256 int parent_group = EXT3_I(parent)->i_block_group;
257 struct ext3_sb_info *sbi = EXT3_SB(sb);
258 struct ext3_super_block *es = sbi->s_es;
259 int ngroups = sbi->s_groups_count;
260 int inodes_per_group = EXT3_INODES_PER_GROUP(sb);
Eric Sandeeneee194e2006-09-27 01:49:30 -0700261 unsigned int freei, avefreei;
Mingming Cao1c2bf372006-06-25 05:48:06 -0700262 ext3_fsblk_t freeb, avefreeb;
263 ext3_fsblk_t blocks_per_dir;
Eric Sandeeneee194e2006-09-27 01:49:30 -0700264 unsigned int ndirs;
Mingming Cao1c2bf372006-06-25 05:48:06 -0700265 int max_debt, max_dirs, min_inodes;
266 ext3_grpblk_t min_blocks;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267 int group = -1, i;
268 struct ext3_group_desc *desc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700269
270 freei = percpu_counter_read_positive(&sbi->s_freeinodes_counter);
271 avefreei = freei / ngroups;
272 freeb = percpu_counter_read_positive(&sbi->s_freeblocks_counter);
273 avefreeb = freeb / ngroups;
274 ndirs = percpu_counter_read_positive(&sbi->s_dirs_counter);
275
276 if ((parent == sb->s_root->d_inode) ||
277 (EXT3_I(parent)->i_flags & EXT3_TOPDIR_FL)) {
278 int best_ndir = inodes_per_group;
279 int best_group = -1;
280
281 get_random_bytes(&group, sizeof(group));
282 parent_group = (unsigned)group % ngroups;
283 for (i = 0; i < ngroups; i++) {
284 group = (parent_group + i) % ngroups;
Eric Sandeenef2fb672007-10-16 23:26:30 -0700285 desc = ext3_get_group_desc (sb, group, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700286 if (!desc || !desc->bg_free_inodes_count)
287 continue;
288 if (le16_to_cpu(desc->bg_used_dirs_count) >= best_ndir)
289 continue;
290 if (le16_to_cpu(desc->bg_free_inodes_count) < avefreei)
291 continue;
292 if (le16_to_cpu(desc->bg_free_blocks_count) < avefreeb)
293 continue;
294 best_group = group;
295 best_ndir = le16_to_cpu(desc->bg_used_dirs_count);
296 }
297 if (best_group >= 0)
298 return best_group;
299 goto fallback;
300 }
301
302 blocks_per_dir = (le32_to_cpu(es->s_blocks_count) - freeb) / ndirs;
303
304 max_dirs = ndirs / ngroups + inodes_per_group / 16;
305 min_inodes = avefreei - inodes_per_group / 4;
306 min_blocks = avefreeb - EXT3_BLOCKS_PER_GROUP(sb) / 4;
307
Mingming Cao1c2bf372006-06-25 05:48:06 -0700308 max_debt = EXT3_BLOCKS_PER_GROUP(sb) / max(blocks_per_dir, (ext3_fsblk_t)BLOCK_COST);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700309 if (max_debt * INODE_COST > inodes_per_group)
310 max_debt = inodes_per_group / INODE_COST;
311 if (max_debt > 255)
312 max_debt = 255;
313 if (max_debt == 0)
314 max_debt = 1;
315
316 for (i = 0; i < ngroups; i++) {
317 group = (parent_group + i) % ngroups;
Eric Sandeenef2fb672007-10-16 23:26:30 -0700318 desc = ext3_get_group_desc (sb, group, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319 if (!desc || !desc->bg_free_inodes_count)
320 continue;
321 if (le16_to_cpu(desc->bg_used_dirs_count) >= max_dirs)
322 continue;
323 if (le16_to_cpu(desc->bg_free_inodes_count) < min_inodes)
324 continue;
325 if (le16_to_cpu(desc->bg_free_blocks_count) < min_blocks)
326 continue;
327 return group;
328 }
329
330fallback:
331 for (i = 0; i < ngroups; i++) {
332 group = (parent_group + i) % ngroups;
Eric Sandeenef2fb672007-10-16 23:26:30 -0700333 desc = ext3_get_group_desc (sb, group, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334 if (!desc || !desc->bg_free_inodes_count)
335 continue;
336 if (le16_to_cpu(desc->bg_free_inodes_count) >= avefreei)
337 return group;
338 }
339
340 if (avefreei) {
341 /*
342 * The free-inodes counter is approximate, and for really small
343 * filesystems the above test can fail to find any blockgroups
344 */
345 avefreei = 0;
346 goto fallback;
347 }
348
349 return -1;
350}
351
352static int find_group_other(struct super_block *sb, struct inode *parent)
353{
354 int parent_group = EXT3_I(parent)->i_block_group;
355 int ngroups = EXT3_SB(sb)->s_groups_count;
356 struct ext3_group_desc *desc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357 int group, i;
358
359 /*
360 * Try to place the inode in its parent directory
361 */
362 group = parent_group;
Eric Sandeenef2fb672007-10-16 23:26:30 -0700363 desc = ext3_get_group_desc (sb, group, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700364 if (desc && le16_to_cpu(desc->bg_free_inodes_count) &&
365 le16_to_cpu(desc->bg_free_blocks_count))
366 return group;
367
368 /*
369 * We're going to place this inode in a different blockgroup from its
370 * parent. We want to cause files in a common directory to all land in
371 * the same blockgroup. But we want files which are in a different
372 * directory which shares a blockgroup with our parent to land in a
373 * different blockgroup.
374 *
375 * So add our directory's i_ino into the starting point for the hash.
376 */
377 group = (group + parent->i_ino) % ngroups;
378
379 /*
380 * Use a quadratic hash to find a group with a free inode and some free
381 * blocks.
382 */
383 for (i = 1; i < ngroups; i <<= 1) {
384 group += i;
385 if (group >= ngroups)
386 group -= ngroups;
Eric Sandeenef2fb672007-10-16 23:26:30 -0700387 desc = ext3_get_group_desc (sb, group, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700388 if (desc && le16_to_cpu(desc->bg_free_inodes_count) &&
389 le16_to_cpu(desc->bg_free_blocks_count))
390 return group;
391 }
392
393 /*
394 * That failed: try linear search for a free inode, even if that group
395 * has no free blocks.
396 */
397 group = parent_group;
398 for (i = 0; i < ngroups; i++) {
399 if (++group >= ngroups)
400 group = 0;
Eric Sandeenef2fb672007-10-16 23:26:30 -0700401 desc = ext3_get_group_desc (sb, group, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700402 if (desc && le16_to_cpu(desc->bg_free_inodes_count))
403 return group;
404 }
405
406 return -1;
407}
408
409/*
410 * There are two policies for allocating an inode. If the new inode is
411 * a directory, then a forward search is made for a block group with both
412 * free space and a low directory-to-inode ratio; if that fails, then of
413 * the groups with above-average free space, that group with the fewest
414 * directories already is chosen.
415 *
416 * For other inodes, search forward from the parent directory's block
417 * group to find a free inode.
418 */
419struct inode *ext3_new_inode(handle_t *handle, struct inode * dir, int mode)
420{
421 struct super_block *sb;
422 struct buffer_head *bitmap_bh = NULL;
423 struct buffer_head *bh2;
424 int group;
425 unsigned long ino = 0;
426 struct inode * inode;
427 struct ext3_group_desc * gdp = NULL;
428 struct ext3_super_block * es;
429 struct ext3_inode_info *ei;
430 struct ext3_sb_info *sbi;
431 int err = 0;
432 struct inode *ret;
433 int i;
434
435 /* Cannot create files in a deleted directory */
436 if (!dir || !dir->i_nlink)
437 return ERR_PTR(-EPERM);
438
439 sb = dir->i_sb;
440 inode = new_inode(sb);
441 if (!inode)
442 return ERR_PTR(-ENOMEM);
443 ei = EXT3_I(inode);
444
445 sbi = EXT3_SB(sb);
446 es = sbi->s_es;
447 if (S_ISDIR(mode)) {
448 if (test_opt (sb, OLDALLOC))
449 group = find_group_dir(sb, dir);
450 else
451 group = find_group_orlov(sb, dir);
Mingming Caoae6ddcc2006-09-27 01:49:27 -0700452 } else
Linus Torvalds1da177e2005-04-16 15:20:36 -0700453 group = find_group_other(sb, dir);
454
455 err = -ENOSPC;
456 if (group == -1)
457 goto out;
458
459 for (i = 0; i < sbi->s_groups_count; i++) {
460 err = -EIO;
461
462 gdp = ext3_get_group_desc(sb, group, &bh2);
463 if (!gdp)
464 goto fail;
465
466 brelse(bitmap_bh);
467 bitmap_bh = read_inode_bitmap(sb, group);
468 if (!bitmap_bh)
469 goto fail;
470
471 ino = 0;
472
473repeat_in_this_group:
474 ino = ext3_find_next_zero_bit((unsigned long *)
475 bitmap_bh->b_data, EXT3_INODES_PER_GROUP(sb), ino);
476 if (ino < EXT3_INODES_PER_GROUP(sb)) {
477
478 BUFFER_TRACE(bitmap_bh, "get_write_access");
479 err = ext3_journal_get_write_access(handle, bitmap_bh);
480 if (err)
481 goto fail;
482
483 if (!ext3_set_bit_atomic(sb_bgl_lock(sbi, group),
484 ino, bitmap_bh->b_data)) {
485 /* we won it */
486 BUFFER_TRACE(bitmap_bh,
487 "call ext3_journal_dirty_metadata");
488 err = ext3_journal_dirty_metadata(handle,
489 bitmap_bh);
490 if (err)
491 goto fail;
492 goto got;
493 }
494 /* we lost it */
495 journal_release_buffer(handle, bitmap_bh);
496
497 if (++ino < EXT3_INODES_PER_GROUP(sb))
498 goto repeat_in_this_group;
499 }
500
501 /*
502 * This case is possible in concurrent environment. It is very
503 * rare. We cannot repeat the find_group_xxx() call because
504 * that will simply return the same blockgroup, because the
505 * group descriptor metadata has not yet been updated.
506 * So we just go onto the next blockgroup.
507 */
508 if (++group == sbi->s_groups_count)
509 group = 0;
510 }
511 err = -ENOSPC;
512 goto out;
513
514got:
515 ino += group * EXT3_INODES_PER_GROUP(sb) + 1;
516 if (ino < EXT3_FIRST_INO(sb) || ino > le32_to_cpu(es->s_inodes_count)) {
517 ext3_error (sb, "ext3_new_inode",
518 "reserved inode or inode > inodes count - "
519 "block_group = %d, inode=%lu", group, ino);
520 err = -EIO;
521 goto fail;
522 }
523
524 BUFFER_TRACE(bh2, "get_write_access");
525 err = ext3_journal_get_write_access(handle, bh2);
526 if (err) goto fail;
527 spin_lock(sb_bgl_lock(sbi, group));
Marcin Slusarz50e8a282008-02-08 04:20:13 -0800528 le16_add_cpu(&gdp->bg_free_inodes_count, -1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700529 if (S_ISDIR(mode)) {
Marcin Slusarz50e8a282008-02-08 04:20:13 -0800530 le16_add_cpu(&gdp->bg_used_dirs_count, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700531 }
532 spin_unlock(sb_bgl_lock(sbi, group));
533 BUFFER_TRACE(bh2, "call ext3_journal_dirty_metadata");
534 err = ext3_journal_dirty_metadata(handle, bh2);
535 if (err) goto fail;
536
537 percpu_counter_dec(&sbi->s_freeinodes_counter);
538 if (S_ISDIR(mode))
539 percpu_counter_inc(&sbi->s_dirs_counter);
540 sb->s_dirt = 1;
541
542 inode->i_uid = current->fsuid;
543 if (test_opt (sb, GRPID))
544 inode->i_gid = dir->i_gid;
545 else if (dir->i_mode & S_ISGID) {
546 inode->i_gid = dir->i_gid;
547 if (S_ISDIR(mode))
548 mode |= S_ISGID;
549 } else
550 inode->i_gid = current->fsgid;
551 inode->i_mode = mode;
552
553 inode->i_ino = ino;
554 /* This is the optimal IO size (for stat), not the fs block size */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700555 inode->i_blocks = 0;
556 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC;
557
558 memset(ei->i_data, 0, sizeof(ei->i_data));
559 ei->i_dir_start_lookup = 0;
560 ei->i_disksize = 0;
561
562 ei->i_flags = EXT3_I(dir)->i_flags & ~EXT3_INDEX_FL;
563 if (S_ISLNK(mode))
564 ei->i_flags &= ~(EXT3_IMMUTABLE_FL|EXT3_APPEND_FL);
565 /* dirsync only applies to directories */
566 if (!S_ISDIR(mode))
567 ei->i_flags &= ~EXT3_DIRSYNC_FL;
568#ifdef EXT3_FRAGMENTS
569 ei->i_faddr = 0;
570 ei->i_frag_no = 0;
571 ei->i_frag_size = 0;
572#endif
573 ei->i_file_acl = 0;
574 ei->i_dir_acl = 0;
575 ei->i_dtime = 0;
576 ei->i_block_alloc_info = NULL;
577 ei->i_block_group = group;
578
579 ext3_set_inode_flags(inode);
580 if (IS_DIRSYNC(inode))
581 handle->h_sync = 1;
582 insert_inode_hash(inode);
583 spin_lock(&sbi->s_next_gen_lock);
584 inode->i_generation = sbi->s_next_generation++;
585 spin_unlock(&sbi->s_next_gen_lock);
586
587 ei->i_state = EXT3_STATE_NEW;
588 ei->i_extra_isize =
589 (EXT3_INODE_SIZE(inode->i_sb) > EXT3_GOOD_OLD_INODE_SIZE) ?
590 sizeof(struct ext3_inode) - EXT3_GOOD_OLD_INODE_SIZE : 0;
591
592 ret = inode;
593 if(DQUOT_ALLOC_INODE(inode)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700594 err = -EDQUOT;
Chris Sykesdc7b5fd2005-09-27 21:45:23 -0700595 goto fail_drop;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700596 }
Chris Sykesdc7b5fd2005-09-27 21:45:23 -0700597
Linus Torvalds1da177e2005-04-16 15:20:36 -0700598 err = ext3_init_acl(handle, inode, dir);
Chris Sykesdc7b5fd2005-09-27 21:45:23 -0700599 if (err)
600 goto fail_free_drop;
601
Stephen Smalleyac509602005-09-09 13:01:41 -0700602 err = ext3_init_security(handle,inode, dir);
Chris Sykesdc7b5fd2005-09-27 21:45:23 -0700603 if (err)
604 goto fail_free_drop;
605
Linus Torvalds1da177e2005-04-16 15:20:36 -0700606 err = ext3_mark_inode_dirty(handle, inode);
607 if (err) {
608 ext3_std_error(sb, err);
Chris Sykesdc7b5fd2005-09-27 21:45:23 -0700609 goto fail_free_drop;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700610 }
611
612 ext3_debug("allocating inode %lu\n", inode->i_ino);
613 goto really_out;
614fail:
615 ext3_std_error(sb, err);
616out:
617 iput(inode);
618 ret = ERR_PTR(err);
619really_out:
620 brelse(bitmap_bh);
621 return ret;
622
Chris Sykesdc7b5fd2005-09-27 21:45:23 -0700623fail_free_drop:
624 DQUOT_FREE_INODE(inode);
625
626fail_drop:
627 DQUOT_DROP(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700628 inode->i_flags |= S_NOQUOTA;
629 inode->i_nlink = 0;
630 iput(inode);
631 brelse(bitmap_bh);
632 return ERR_PTR(err);
633}
634
635/* Verify that we are loading a valid orphan from disk */
636struct inode *ext3_orphan_get(struct super_block *sb, unsigned long ino)
637{
638 unsigned long max_ino = le32_to_cpu(EXT3_SB(sb)->s_es->s_inodes_count);
639 unsigned long block_group;
640 int bit;
David Howells473043d2008-02-07 00:15:36 -0800641 struct buffer_head *bitmap_bh;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700642 struct inode *inode = NULL;
David Howells473043d2008-02-07 00:15:36 -0800643 long err = -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700644
645 /* Error cases - e2fsck has already cleaned up for us */
646 if (ino > max_ino) {
Harvey Harrisone05b6b52008-04-28 02:16:15 -0700647 ext3_warning(sb, __func__,
Glauber de Oliveira Costa9f406682006-01-08 01:03:22 -0800648 "bad orphan ino %lu! e2fsck was run?", ino);
David Howells473043d2008-02-07 00:15:36 -0800649 goto error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700650 }
651
652 block_group = (ino - 1) / EXT3_INODES_PER_GROUP(sb);
653 bit = (ino - 1) % EXT3_INODES_PER_GROUP(sb);
654 bitmap_bh = read_inode_bitmap(sb, block_group);
655 if (!bitmap_bh) {
Harvey Harrisone05b6b52008-04-28 02:16:15 -0700656 ext3_warning(sb, __func__,
Glauber de Oliveira Costa9f406682006-01-08 01:03:22 -0800657 "inode bitmap error for orphan %lu", ino);
David Howells473043d2008-02-07 00:15:36 -0800658 goto error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700659 }
660
661 /* Having the inode bit set should be a 100% indicator that this
662 * is a valid orphan (no e2fsck run on fs). Orphans also include
663 * inodes that were being truncated, so we can't check i_nlink==0.
664 */
David Howells473043d2008-02-07 00:15:36 -0800665 if (!ext3_test_bit(bit, bitmap_bh->b_data))
666 goto bad_orphan;
667
668 inode = ext3_iget(sb, ino);
669 if (IS_ERR(inode))
670 goto iget_failed;
671
Duane Griffinae76dd92008-07-25 01:46:23 -0700672 /*
673 * If the orphans has i_nlinks > 0 then it should be able to be
674 * truncated, otherwise it won't be removed from the orphan list
675 * during processing and an infinite loop will result.
676 */
677 if (inode->i_nlink && !ext3_can_truncate(inode))
678 goto bad_orphan;
679
David Howells473043d2008-02-07 00:15:36 -0800680 if (NEXT_ORPHAN(inode) > max_ino)
681 goto bad_orphan;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700682 brelse(bitmap_bh);
683 return inode;
David Howells473043d2008-02-07 00:15:36 -0800684
685iget_failed:
686 err = PTR_ERR(inode);
687 inode = NULL;
688bad_orphan:
Harvey Harrisone05b6b52008-04-28 02:16:15 -0700689 ext3_warning(sb, __func__,
David Howells473043d2008-02-07 00:15:36 -0800690 "bad orphan inode %lu! e2fsck was run?", ino);
691 printk(KERN_NOTICE "ext3_test_bit(bit=%d, block=%llu) = %d\n",
692 bit, (unsigned long long)bitmap_bh->b_blocknr,
693 ext3_test_bit(bit, bitmap_bh->b_data));
694 printk(KERN_NOTICE "inode=%p\n", inode);
695 if (inode) {
696 printk(KERN_NOTICE "is_bad_inode(inode)=%d\n",
697 is_bad_inode(inode));
698 printk(KERN_NOTICE "NEXT_ORPHAN(inode)=%u\n",
699 NEXT_ORPHAN(inode));
700 printk(KERN_NOTICE "max_ino=%lu\n", max_ino);
Duane Griffinae76dd92008-07-25 01:46:23 -0700701 printk(KERN_NOTICE "i_nlink=%u\n", inode->i_nlink);
David Howells473043d2008-02-07 00:15:36 -0800702 /* Avoid freeing blocks if we got a bad deleted inode */
703 if (inode->i_nlink == 0)
704 inode->i_blocks = 0;
705 iput(inode);
706 }
707 brelse(bitmap_bh);
708error:
709 return ERR_PTR(err);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700710}
711
712unsigned long ext3_count_free_inodes (struct super_block * sb)
713{
714 unsigned long desc_count;
715 struct ext3_group_desc *gdp;
716 int i;
717#ifdef EXT3FS_DEBUG
718 struct ext3_super_block *es;
719 unsigned long bitmap_count, x;
720 struct buffer_head *bitmap_bh = NULL;
721
Linus Torvalds1da177e2005-04-16 15:20:36 -0700722 es = EXT3_SB(sb)->s_es;
723 desc_count = 0;
724 bitmap_count = 0;
725 gdp = NULL;
726 for (i = 0; i < EXT3_SB(sb)->s_groups_count; i++) {
727 gdp = ext3_get_group_desc (sb, i, NULL);
728 if (!gdp)
729 continue;
730 desc_count += le16_to_cpu(gdp->bg_free_inodes_count);
731 brelse(bitmap_bh);
732 bitmap_bh = read_inode_bitmap(sb, i);
733 if (!bitmap_bh)
734 continue;
735
736 x = ext3_count_free(bitmap_bh, EXT3_INODES_PER_GROUP(sb) / 8);
737 printk("group %d: stored = %d, counted = %lu\n",
738 i, le16_to_cpu(gdp->bg_free_inodes_count), x);
739 bitmap_count += x;
740 }
741 brelse(bitmap_bh);
742 printk("ext3_count_free_inodes: stored = %u, computed = %lu, %lu\n",
743 le32_to_cpu(es->s_free_inodes_count), desc_count, bitmap_count);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700744 return desc_count;
745#else
746 desc_count = 0;
747 for (i = 0; i < EXT3_SB(sb)->s_groups_count; i++) {
748 gdp = ext3_get_group_desc (sb, i, NULL);
749 if (!gdp)
750 continue;
751 desc_count += le16_to_cpu(gdp->bg_free_inodes_count);
752 cond_resched();
753 }
754 return desc_count;
755#endif
756}
757
758/* Called at mount-time, super-block is locked */
759unsigned long ext3_count_dirs (struct super_block * sb)
760{
761 unsigned long count = 0;
762 int i;
763
764 for (i = 0; i < EXT3_SB(sb)->s_groups_count; i++) {
765 struct ext3_group_desc *gdp = ext3_get_group_desc (sb, i, NULL);
766 if (!gdp)
767 continue;
768 count += le16_to_cpu(gdp->bg_used_dirs_count);
769 }
770 return count;
771}
772