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Commit | Line | Data |
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1da177e4 LT |
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> | |
785c4bcc | 26 | #include <trace/events/ext3.h> |
1da177e4 LT |
27 | |
28 | #include <asm/byteorder.h> | |
29 | ||
30 | #include "xattr.h" | |
31 | #include "acl.h" | |
32 | ||
33 | /* | |
34 | * ialloc.c contains the inodes allocation and deallocation routines | |
35 | */ | |
36 | ||
37 | /* | |
38 | * The free inodes are managed by bitmaps. A file system contains several | |
39 | * blocks groups. Each group contains 1 bitmap block for blocks, 1 bitmap | |
40 | * block for inodes, N blocks for the inode table and data blocks. | |
41 | * | |
42 | * The file system contains group descriptors which are located after the | |
43 | * super block. Each descriptor contains the number of the bitmap block and | |
44 | * the free blocks count in the block. | |
45 | */ | |
46 | ||
47 | ||
48 | /* | |
49 | * Read the inode allocation bitmap for a given block_group, reading | |
50 | * into the specified slot in the superblock's bitmap cache. | |
51 | * | |
52 | * Return buffer_head of bitmap on success or NULL. | |
53 | */ | |
54 | static struct buffer_head * | |
55 | read_inode_bitmap(struct super_block * sb, unsigned long block_group) | |
56 | { | |
57 | struct ext3_group_desc *desc; | |
58 | struct buffer_head *bh = NULL; | |
59 | ||
60 | desc = ext3_get_group_desc(sb, block_group, NULL); | |
61 | if (!desc) | |
62 | goto error_out; | |
63 | ||
64 | bh = sb_bread(sb, le32_to_cpu(desc->bg_inode_bitmap)); | |
65 | if (!bh) | |
66 | ext3_error(sb, "read_inode_bitmap", | |
67 | "Cannot read inode bitmap - " | |
68 | "block_group = %lu, inode_bitmap = %u", | |
69 | block_group, le32_to_cpu(desc->bg_inode_bitmap)); | |
70 | error_out: | |
71 | return bh; | |
72 | } | |
73 | ||
74 | /* | |
75 | * NOTE! When we get the inode, we're the only people | |
76 | * that have access to it, and as such there are no | |
77 | * race conditions we have to worry about. The inode | |
78 | * is not on the hash-lists, and it cannot be reached | |
79 | * through the filesystem because the directory entry | |
80 | * has been deleted earlier. | |
81 | * | |
82 | * HOWEVER: we must make sure that we get no aliases, | |
83 | * which means that we have to call "clear_inode()" | |
84 | * _before_ we mark the inode not in use in the inode | |
85 | * bitmaps. Otherwise a newly created file might use | |
86 | * the same inode number (not actually the same pointer | |
87 | * though), and then we'd have two inodes sharing the | |
88 | * same inode number and space on the harddisk. | |
89 | */ | |
90 | void ext3_free_inode (handle_t *handle, struct inode * inode) | |
91 | { | |
92 | struct super_block * sb = inode->i_sb; | |
93 | int is_directory; | |
94 | unsigned long ino; | |
95 | struct buffer_head *bitmap_bh = NULL; | |
96 | struct buffer_head *bh2; | |
97 | unsigned long block_group; | |
98 | unsigned long bit; | |
99 | struct ext3_group_desc * gdp; | |
100 | struct ext3_super_block * es; | |
101 | struct ext3_sb_info *sbi; | |
102 | int fatal = 0, err; | |
103 | ||
104 | if (atomic_read(&inode->i_count) > 1) { | |
105 | printk ("ext3_free_inode: inode has count=%d\n", | |
106 | atomic_read(&inode->i_count)); | |
107 | return; | |
108 | } | |
109 | if (inode->i_nlink) { | |
110 | printk ("ext3_free_inode: inode has nlink=%d\n", | |
111 | inode->i_nlink); | |
112 | return; | |
113 | } | |
114 | if (!sb) { | |
115 | printk("ext3_free_inode: inode on nonexistent device\n"); | |
116 | return; | |
117 | } | |
118 | sbi = EXT3_SB(sb); | |
119 | ||
120 | ino = inode->i_ino; | |
121 | ext3_debug ("freeing inode %lu\n", ino); | |
785c4bcc | 122 | trace_ext3_free_inode(inode); |
1da177e4 | 123 | |
1da177e4 LT |
124 | is_directory = S_ISDIR(inode->i_mode); |
125 | ||
1da177e4 LT |
126 | es = EXT3_SB(sb)->s_es; |
127 | if (ino < EXT3_FIRST_INO(sb) || ino > le32_to_cpu(es->s_inodes_count)) { | |
128 | ext3_error (sb, "ext3_free_inode", | |
129 | "reserved or nonexistent inode %lu", ino); | |
130 | goto error_return; | |
131 | } | |
132 | block_group = (ino - 1) / EXT3_INODES_PER_GROUP(sb); | |
133 | bit = (ino - 1) % EXT3_INODES_PER_GROUP(sb); | |
134 | bitmap_bh = read_inode_bitmap(sb, block_group); | |
135 | if (!bitmap_bh) | |
136 | goto error_return; | |
137 | ||
138 | BUFFER_TRACE(bitmap_bh, "get_write_access"); | |
139 | fatal = ext3_journal_get_write_access(handle, bitmap_bh); | |
140 | if (fatal) | |
141 | goto error_return; | |
142 | ||
143 | /* Ok, now we can actually update the inode bitmaps.. */ | |
144 | if (!ext3_clear_bit_atomic(sb_bgl_lock(sbi, block_group), | |
145 | bit, bitmap_bh->b_data)) | |
146 | ext3_error (sb, "ext3_free_inode", | |
147 | "bit already cleared for inode %lu", ino); | |
148 | else { | |
149 | gdp = ext3_get_group_desc (sb, block_group, &bh2); | |
150 | ||
151 | BUFFER_TRACE(bh2, "get_write_access"); | |
152 | fatal = ext3_journal_get_write_access(handle, bh2); | |
153 | if (fatal) goto error_return; | |
154 | ||
155 | if (gdp) { | |
156 | spin_lock(sb_bgl_lock(sbi, block_group)); | |
50e8a289 | 157 | le16_add_cpu(&gdp->bg_free_inodes_count, 1); |
1da177e4 | 158 | if (is_directory) |
50e8a289 | 159 | le16_add_cpu(&gdp->bg_used_dirs_count, -1); |
1da177e4 LT |
160 | spin_unlock(sb_bgl_lock(sbi, block_group)); |
161 | percpu_counter_inc(&sbi->s_freeinodes_counter); | |
162 | if (is_directory) | |
163 | percpu_counter_dec(&sbi->s_dirs_counter); | |
164 | ||
165 | } | |
166 | BUFFER_TRACE(bh2, "call ext3_journal_dirty_metadata"); | |
167 | err = ext3_journal_dirty_metadata(handle, bh2); | |
168 | if (!fatal) fatal = err; | |
169 | } | |
170 | BUFFER_TRACE(bitmap_bh, "call ext3_journal_dirty_metadata"); | |
171 | err = ext3_journal_dirty_metadata(handle, bitmap_bh); | |
172 | if (!fatal) | |
173 | fatal = err; | |
ca41f7b9 | 174 | |
1da177e4 LT |
175 | error_return: |
176 | brelse(bitmap_bh); | |
177 | ext3_std_error(sb, fatal); | |
178 | } | |
179 | ||
ae6ddcc5 MC |
180 | /* |
181 | * Orlov's allocator for directories. | |
182 | * | |
1da177e4 LT |
183 | * We always try to spread first-level directories. |
184 | * | |
ae6ddcc5 MC |
185 | * If there are blockgroups with both free inodes and free blocks counts |
186 | * not worse than average we return one with smallest directory count. | |
187 | * Otherwise we simply return a random group. | |
188 | * | |
189 | * For the rest rules look so: | |
190 | * | |
191 | * It's OK to put directory into a group unless | |
192 | * it has too many directories already (max_dirs) or | |
193 | * it has too few free inodes left (min_inodes) or | |
194 | * it has too few free blocks left (min_blocks) or | |
195 | * it's already running too large debt (max_debt). | |
1cc8dcf5 | 196 | * Parent's group is preferred, if it doesn't satisfy these |
ae6ddcc5 MC |
197 | * conditions we search cyclically through the rest. If none |
198 | * of the groups look good we just look for a group with more | |
199 | * free inodes than average (starting at parent's group). | |
200 | * | |
201 | * Debt is incremented each time we allocate a directory and decremented | |
202 | * when we allocate an inode, within 0--255. | |
203 | */ | |
1da177e4 LT |
204 | |
205 | #define INODE_COST 64 | |
206 | #define BLOCK_COST 256 | |
207 | ||
208 | static int find_group_orlov(struct super_block *sb, struct inode *parent) | |
209 | { | |
210 | int parent_group = EXT3_I(parent)->i_block_group; | |
211 | struct ext3_sb_info *sbi = EXT3_SB(sb); | |
212 | struct ext3_super_block *es = sbi->s_es; | |
213 | int ngroups = sbi->s_groups_count; | |
214 | int inodes_per_group = EXT3_INODES_PER_GROUP(sb); | |
eee194e7 | 215 | unsigned int freei, avefreei; |
1c2bf374 MC |
216 | ext3_fsblk_t freeb, avefreeb; |
217 | ext3_fsblk_t blocks_per_dir; | |
eee194e7 | 218 | unsigned int ndirs; |
1c2bf374 MC |
219 | int max_debt, max_dirs, min_inodes; |
220 | ext3_grpblk_t min_blocks; | |
1da177e4 LT |
221 | int group = -1, i; |
222 | struct ext3_group_desc *desc; | |
1da177e4 LT |
223 | |
224 | freei = percpu_counter_read_positive(&sbi->s_freeinodes_counter); | |
225 | avefreei = freei / ngroups; | |
226 | freeb = percpu_counter_read_positive(&sbi->s_freeblocks_counter); | |
227 | avefreeb = freeb / ngroups; | |
228 | ndirs = percpu_counter_read_positive(&sbi->s_dirs_counter); | |
229 | ||
230 | if ((parent == sb->s_root->d_inode) || | |
231 | (EXT3_I(parent)->i_flags & EXT3_TOPDIR_FL)) { | |
232 | int best_ndir = inodes_per_group; | |
233 | int best_group = -1; | |
234 | ||
235 | get_random_bytes(&group, sizeof(group)); | |
236 | parent_group = (unsigned)group % ngroups; | |
237 | for (i = 0; i < ngroups; i++) { | |
238 | group = (parent_group + i) % ngroups; | |
ef2fb679 | 239 | desc = ext3_get_group_desc (sb, group, NULL); |
1da177e4 LT |
240 | if (!desc || !desc->bg_free_inodes_count) |
241 | continue; | |
242 | if (le16_to_cpu(desc->bg_used_dirs_count) >= best_ndir) | |
243 | continue; | |
244 | if (le16_to_cpu(desc->bg_free_inodes_count) < avefreei) | |
245 | continue; | |
246 | if (le16_to_cpu(desc->bg_free_blocks_count) < avefreeb) | |
247 | continue; | |
248 | best_group = group; | |
249 | best_ndir = le16_to_cpu(desc->bg_used_dirs_count); | |
250 | } | |
251 | if (best_group >= 0) | |
252 | return best_group; | |
253 | goto fallback; | |
254 | } | |
255 | ||
256 | blocks_per_dir = (le32_to_cpu(es->s_blocks_count) - freeb) / ndirs; | |
257 | ||
258 | max_dirs = ndirs / ngroups + inodes_per_group / 16; | |
259 | min_inodes = avefreei - inodes_per_group / 4; | |
260 | min_blocks = avefreeb - EXT3_BLOCKS_PER_GROUP(sb) / 4; | |
261 | ||
1c2bf374 | 262 | max_debt = EXT3_BLOCKS_PER_GROUP(sb) / max(blocks_per_dir, (ext3_fsblk_t)BLOCK_COST); |
1da177e4 LT |
263 | if (max_debt * INODE_COST > inodes_per_group) |
264 | max_debt = inodes_per_group / INODE_COST; | |
265 | if (max_debt > 255) | |
266 | max_debt = 255; | |
267 | if (max_debt == 0) | |
268 | max_debt = 1; | |
269 | ||
270 | for (i = 0; i < ngroups; i++) { | |
271 | group = (parent_group + i) % ngroups; | |
ef2fb679 | 272 | desc = ext3_get_group_desc (sb, group, NULL); |
1da177e4 LT |
273 | if (!desc || !desc->bg_free_inodes_count) |
274 | continue; | |
275 | if (le16_to_cpu(desc->bg_used_dirs_count) >= max_dirs) | |
276 | continue; | |
277 | if (le16_to_cpu(desc->bg_free_inodes_count) < min_inodes) | |
278 | continue; | |
279 | if (le16_to_cpu(desc->bg_free_blocks_count) < min_blocks) | |
280 | continue; | |
281 | return group; | |
282 | } | |
283 | ||
284 | fallback: | |
285 | for (i = 0; i < ngroups; i++) { | |
286 | group = (parent_group + i) % ngroups; | |
ef2fb679 | 287 | desc = ext3_get_group_desc (sb, group, NULL); |
1da177e4 LT |
288 | if (!desc || !desc->bg_free_inodes_count) |
289 | continue; | |
290 | if (le16_to_cpu(desc->bg_free_inodes_count) >= avefreei) | |
291 | return group; | |
292 | } | |
293 | ||
294 | if (avefreei) { | |
295 | /* | |
296 | * The free-inodes counter is approximate, and for really small | |
297 | * filesystems the above test can fail to find any blockgroups | |
298 | */ | |
299 | avefreei = 0; | |
300 | goto fallback; | |
301 | } | |
302 | ||
303 | return -1; | |
304 | } | |
305 | ||
306 | static int find_group_other(struct super_block *sb, struct inode *parent) | |
307 | { | |
308 | int parent_group = EXT3_I(parent)->i_block_group; | |
309 | int ngroups = EXT3_SB(sb)->s_groups_count; | |
310 | struct ext3_group_desc *desc; | |
1da177e4 LT |
311 | int group, i; |
312 | ||
313 | /* | |
314 | * Try to place the inode in its parent directory | |
315 | */ | |
316 | group = parent_group; | |
ef2fb679 | 317 | desc = ext3_get_group_desc (sb, group, NULL); |
1da177e4 LT |
318 | if (desc && le16_to_cpu(desc->bg_free_inodes_count) && |
319 | le16_to_cpu(desc->bg_free_blocks_count)) | |
320 | return group; | |
321 | ||
322 | /* | |
323 | * We're going to place this inode in a different blockgroup from its | |
324 | * parent. We want to cause files in a common directory to all land in | |
325 | * the same blockgroup. But we want files which are in a different | |
326 | * directory which shares a blockgroup with our parent to land in a | |
327 | * different blockgroup. | |
328 | * | |
329 | * So add our directory's i_ino into the starting point for the hash. | |
330 | */ | |
331 | group = (group + parent->i_ino) % ngroups; | |
332 | ||
333 | /* | |
334 | * Use a quadratic hash to find a group with a free inode and some free | |
335 | * blocks. | |
336 | */ | |
337 | for (i = 1; i < ngroups; i <<= 1) { | |
338 | group += i; | |
339 | if (group >= ngroups) | |
340 | group -= ngroups; | |
ef2fb679 | 341 | desc = ext3_get_group_desc (sb, group, NULL); |
1da177e4 LT |
342 | if (desc && le16_to_cpu(desc->bg_free_inodes_count) && |
343 | le16_to_cpu(desc->bg_free_blocks_count)) | |
344 | return group; | |
345 | } | |
346 | ||
347 | /* | |
348 | * That failed: try linear search for a free inode, even if that group | |
349 | * has no free blocks. | |
350 | */ | |
351 | group = parent_group; | |
352 | for (i = 0; i < ngroups; i++) { | |
353 | if (++group >= ngroups) | |
354 | group = 0; | |
ef2fb679 | 355 | desc = ext3_get_group_desc (sb, group, NULL); |
1da177e4 LT |
356 | if (desc && le16_to_cpu(desc->bg_free_inodes_count)) |
357 | return group; | |
358 | } | |
359 | ||
360 | return -1; | |
361 | } | |
362 | ||
363 | /* | |
364 | * There are two policies for allocating an inode. If the new inode is | |
365 | * a directory, then a forward search is made for a block group with both | |
366 | * free space and a low directory-to-inode ratio; if that fails, then of | |
367 | * the groups with above-average free space, that group with the fewest | |
368 | * directories already is chosen. | |
369 | * | |
370 | * For other inodes, search forward from the parent directory's block | |
371 | * group to find a free inode. | |
372 | */ | |
2a7dba39 EP |
373 | struct inode *ext3_new_inode(handle_t *handle, struct inode * dir, |
374 | const struct qstr *qstr, int mode) | |
1da177e4 LT |
375 | { |
376 | struct super_block *sb; | |
377 | struct buffer_head *bitmap_bh = NULL; | |
378 | struct buffer_head *bh2; | |
379 | int group; | |
380 | unsigned long ino = 0; | |
381 | struct inode * inode; | |
382 | struct ext3_group_desc * gdp = NULL; | |
383 | struct ext3_super_block * es; | |
384 | struct ext3_inode_info *ei; | |
385 | struct ext3_sb_info *sbi; | |
386 | int err = 0; | |
387 | struct inode *ret; | |
388 | int i; | |
389 | ||
390 | /* Cannot create files in a deleted directory */ | |
391 | if (!dir || !dir->i_nlink) | |
392 | return ERR_PTR(-EPERM); | |
393 | ||
394 | sb = dir->i_sb; | |
785c4bcc | 395 | trace_ext3_request_inode(dir, mode); |
1da177e4 LT |
396 | inode = new_inode(sb); |
397 | if (!inode) | |
398 | return ERR_PTR(-ENOMEM); | |
399 | ei = EXT3_I(inode); | |
400 | ||
401 | sbi = EXT3_SB(sb); | |
402 | es = sbi->s_es; | |
fbc85402 LC |
403 | if (S_ISDIR(mode)) |
404 | group = find_group_orlov(sb, dir); | |
405 | else | |
1da177e4 LT |
406 | group = find_group_other(sb, dir); |
407 | ||
408 | err = -ENOSPC; | |
409 | if (group == -1) | |
410 | goto out; | |
411 | ||
412 | for (i = 0; i < sbi->s_groups_count; i++) { | |
413 | err = -EIO; | |
414 | ||
415 | gdp = ext3_get_group_desc(sb, group, &bh2); | |
416 | if (!gdp) | |
417 | goto fail; | |
418 | ||
419 | brelse(bitmap_bh); | |
420 | bitmap_bh = read_inode_bitmap(sb, group); | |
421 | if (!bitmap_bh) | |
422 | goto fail; | |
423 | ||
424 | ino = 0; | |
425 | ||
426 | repeat_in_this_group: | |
427 | ino = ext3_find_next_zero_bit((unsigned long *) | |
428 | bitmap_bh->b_data, EXT3_INODES_PER_GROUP(sb), ino); | |
429 | if (ino < EXT3_INODES_PER_GROUP(sb)) { | |
430 | ||
431 | BUFFER_TRACE(bitmap_bh, "get_write_access"); | |
432 | err = ext3_journal_get_write_access(handle, bitmap_bh); | |
433 | if (err) | |
434 | goto fail; | |
435 | ||
436 | if (!ext3_set_bit_atomic(sb_bgl_lock(sbi, group), | |
437 | ino, bitmap_bh->b_data)) { | |
438 | /* we won it */ | |
439 | BUFFER_TRACE(bitmap_bh, | |
440 | "call ext3_journal_dirty_metadata"); | |
441 | err = ext3_journal_dirty_metadata(handle, | |
442 | bitmap_bh); | |
443 | if (err) | |
444 | goto fail; | |
445 | goto got; | |
446 | } | |
447 | /* we lost it */ | |
448 | journal_release_buffer(handle, bitmap_bh); | |
449 | ||
450 | if (++ino < EXT3_INODES_PER_GROUP(sb)) | |
451 | goto repeat_in_this_group; | |
452 | } | |
453 | ||
454 | /* | |
455 | * This case is possible in concurrent environment. It is very | |
456 | * rare. We cannot repeat the find_group_xxx() call because | |
457 | * that will simply return the same blockgroup, because the | |
458 | * group descriptor metadata has not yet been updated. | |
459 | * So we just go onto the next blockgroup. | |
460 | */ | |
461 | if (++group == sbi->s_groups_count) | |
462 | group = 0; | |
463 | } | |
464 | err = -ENOSPC; | |
465 | goto out; | |
466 | ||
467 | got: | |
468 | ino += group * EXT3_INODES_PER_GROUP(sb) + 1; | |
469 | if (ino < EXT3_FIRST_INO(sb) || ino > le32_to_cpu(es->s_inodes_count)) { | |
470 | ext3_error (sb, "ext3_new_inode", | |
471 | "reserved inode or inode > inodes count - " | |
472 | "block_group = %d, inode=%lu", group, ino); | |
473 | err = -EIO; | |
474 | goto fail; | |
475 | } | |
476 | ||
477 | BUFFER_TRACE(bh2, "get_write_access"); | |
478 | err = ext3_journal_get_write_access(handle, bh2); | |
479 | if (err) goto fail; | |
480 | spin_lock(sb_bgl_lock(sbi, group)); | |
50e8a289 | 481 | le16_add_cpu(&gdp->bg_free_inodes_count, -1); |
1da177e4 | 482 | if (S_ISDIR(mode)) { |
50e8a289 | 483 | le16_add_cpu(&gdp->bg_used_dirs_count, 1); |
1da177e4 LT |
484 | } |
485 | spin_unlock(sb_bgl_lock(sbi, group)); | |
486 | BUFFER_TRACE(bh2, "call ext3_journal_dirty_metadata"); | |
487 | err = ext3_journal_dirty_metadata(handle, bh2); | |
488 | if (err) goto fail; | |
489 | ||
490 | percpu_counter_dec(&sbi->s_freeinodes_counter); | |
491 | if (S_ISDIR(mode)) | |
492 | percpu_counter_inc(&sbi->s_dirs_counter); | |
1da177e4 | 493 | |
aab99c2c DM |
494 | |
495 | if (test_opt(sb, GRPID)) { | |
496 | inode->i_mode = mode; | |
497 | inode->i_uid = current_fsuid(); | |
1da177e4 | 498 | inode->i_gid = dir->i_gid; |
1da177e4 | 499 | } else |
aab99c2c | 500 | inode_init_owner(inode, dir, mode); |
1da177e4 LT |
501 | |
502 | inode->i_ino = ino; | |
503 | /* This is the optimal IO size (for stat), not the fs block size */ | |
1da177e4 LT |
504 | inode->i_blocks = 0; |
505 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC; | |
506 | ||
507 | memset(ei->i_data, 0, sizeof(ei->i_data)); | |
508 | ei->i_dir_start_lookup = 0; | |
509 | ei->i_disksize = 0; | |
510 | ||
04143e2f DG |
511 | ei->i_flags = |
512 | ext3_mask_flags(mode, EXT3_I(dir)->i_flags & EXT3_FL_INHERITED); | |
1da177e4 LT |
513 | #ifdef EXT3_FRAGMENTS |
514 | ei->i_faddr = 0; | |
515 | ei->i_frag_no = 0; | |
516 | ei->i_frag_size = 0; | |
517 | #endif | |
518 | ei->i_file_acl = 0; | |
519 | ei->i_dir_acl = 0; | |
520 | ei->i_dtime = 0; | |
521 | ei->i_block_alloc_info = NULL; | |
522 | ei->i_block_group = group; | |
523 | ||
524 | ext3_set_inode_flags(inode); | |
525 | if (IS_DIRSYNC(inode)) | |
526 | handle->h_sync = 1; | |
c38012da AV |
527 | if (insert_inode_locked(inode) < 0) { |
528 | err = -EINVAL; | |
529 | goto fail_drop; | |
530 | } | |
1da177e4 LT |
531 | spin_lock(&sbi->s_next_gen_lock); |
532 | inode->i_generation = sbi->s_next_generation++; | |
533 | spin_unlock(&sbi->s_next_gen_lock); | |
534 | ||
de329820 LT |
535 | ei->i_state_flags = 0; |
536 | ext3_set_inode_state(inode, EXT3_STATE_NEW); | |
537 | ||
beb37b85 JK |
538 | /* See comment in ext3_iget for explanation */ |
539 | if (ino >= EXT3_FIRST_INO(sb) + 1 && | |
540 | EXT3_INODE_SIZE(sb) > EXT3_GOOD_OLD_INODE_SIZE) { | |
541 | ei->i_extra_isize = | |
542 | sizeof(struct ext3_inode) - EXT3_GOOD_OLD_INODE_SIZE; | |
543 | } else { | |
544 | ei->i_extra_isize = 0; | |
545 | } | |
1da177e4 LT |
546 | |
547 | ret = inode; | |
871a2931 | 548 | dquot_initialize(inode); |
63936dda CH |
549 | err = dquot_alloc_inode(inode); |
550 | if (err) | |
dc7b5fd6 | 551 | goto fail_drop; |
dc7b5fd6 | 552 | |
1da177e4 | 553 | err = ext3_init_acl(handle, inode, dir); |
dc7b5fd6 CS |
554 | if (err) |
555 | goto fail_free_drop; | |
556 | ||
2a7dba39 | 557 | err = ext3_init_security(handle, inode, dir, qstr); |
dc7b5fd6 CS |
558 | if (err) |
559 | goto fail_free_drop; | |
560 | ||
1da177e4 LT |
561 | err = ext3_mark_inode_dirty(handle, inode); |
562 | if (err) { | |
563 | ext3_std_error(sb, err); | |
dc7b5fd6 | 564 | goto fail_free_drop; |
1da177e4 LT |
565 | } |
566 | ||
567 | ext3_debug("allocating inode %lu\n", inode->i_ino); | |
785c4bcc | 568 | trace_ext3_allocate_inode(inode, dir, mode); |
1da177e4 LT |
569 | goto really_out; |
570 | fail: | |
571 | ext3_std_error(sb, err); | |
572 | out: | |
573 | iput(inode); | |
574 | ret = ERR_PTR(err); | |
575 | really_out: | |
576 | brelse(bitmap_bh); | |
577 | return ret; | |
578 | ||
dc7b5fd6 | 579 | fail_free_drop: |
63936dda | 580 | dquot_free_inode(inode); |
dc7b5fd6 CS |
581 | |
582 | fail_drop: | |
9f754758 | 583 | dquot_drop(inode); |
1da177e4 | 584 | inode->i_flags |= S_NOQUOTA; |
6d6b77f1 | 585 | clear_nlink(inode); |
c38012da | 586 | unlock_new_inode(inode); |
1da177e4 LT |
587 | iput(inode); |
588 | brelse(bitmap_bh); | |
589 | return ERR_PTR(err); | |
590 | } | |
591 | ||
592 | /* Verify that we are loading a valid orphan from disk */ | |
593 | struct inode *ext3_orphan_get(struct super_block *sb, unsigned long ino) | |
594 | { | |
595 | unsigned long max_ino = le32_to_cpu(EXT3_SB(sb)->s_es->s_inodes_count); | |
596 | unsigned long block_group; | |
597 | int bit; | |
473043dc | 598 | struct buffer_head *bitmap_bh; |
1da177e4 | 599 | struct inode *inode = NULL; |
473043dc | 600 | long err = -EIO; |
1da177e4 LT |
601 | |
602 | /* Error cases - e2fsck has already cleaned up for us */ | |
603 | if (ino > max_ino) { | |
e05b6b52 | 604 | ext3_warning(sb, __func__, |
9f40668d | 605 | "bad orphan ino %lu! e2fsck was run?", ino); |
473043dc | 606 | goto error; |
1da177e4 LT |
607 | } |
608 | ||
609 | block_group = (ino - 1) / EXT3_INODES_PER_GROUP(sb); | |
610 | bit = (ino - 1) % EXT3_INODES_PER_GROUP(sb); | |
611 | bitmap_bh = read_inode_bitmap(sb, block_group); | |
612 | if (!bitmap_bh) { | |
e05b6b52 | 613 | ext3_warning(sb, __func__, |
9f40668d | 614 | "inode bitmap error for orphan %lu", ino); |
473043dc | 615 | goto error; |
1da177e4 LT |
616 | } |
617 | ||
618 | /* Having the inode bit set should be a 100% indicator that this | |
619 | * is a valid orphan (no e2fsck run on fs). Orphans also include | |
620 | * inodes that were being truncated, so we can't check i_nlink==0. | |
621 | */ | |
473043dc DH |
622 | if (!ext3_test_bit(bit, bitmap_bh->b_data)) |
623 | goto bad_orphan; | |
624 | ||
625 | inode = ext3_iget(sb, ino); | |
626 | if (IS_ERR(inode)) | |
627 | goto iget_failed; | |
628 | ||
ae76dd9a DG |
629 | /* |
630 | * If the orphans has i_nlinks > 0 then it should be able to be | |
631 | * truncated, otherwise it won't be removed from the orphan list | |
632 | * during processing and an infinite loop will result. | |
633 | */ | |
634 | if (inode->i_nlink && !ext3_can_truncate(inode)) | |
635 | goto bad_orphan; | |
636 | ||
473043dc DH |
637 | if (NEXT_ORPHAN(inode) > max_ino) |
638 | goto bad_orphan; | |
639 | brelse(bitmap_bh); | |
640 | return inode; | |
641 | ||
642 | iget_failed: | |
643 | err = PTR_ERR(inode); | |
644 | inode = NULL; | |
645 | bad_orphan: | |
e05b6b52 | 646 | ext3_warning(sb, __func__, |
473043dc DH |
647 | "bad orphan inode %lu! e2fsck was run?", ino); |
648 | printk(KERN_NOTICE "ext3_test_bit(bit=%d, block=%llu) = %d\n", | |
649 | bit, (unsigned long long)bitmap_bh->b_blocknr, | |
650 | ext3_test_bit(bit, bitmap_bh->b_data)); | |
651 | printk(KERN_NOTICE "inode=%p\n", inode); | |
652 | if (inode) { | |
653 | printk(KERN_NOTICE "is_bad_inode(inode)=%d\n", | |
654 | is_bad_inode(inode)); | |
655 | printk(KERN_NOTICE "NEXT_ORPHAN(inode)=%u\n", | |
656 | NEXT_ORPHAN(inode)); | |
657 | printk(KERN_NOTICE "max_ino=%lu\n", max_ino); | |
ae76dd9a | 658 | printk(KERN_NOTICE "i_nlink=%u\n", inode->i_nlink); |
1da177e4 | 659 | /* Avoid freeing blocks if we got a bad deleted inode */ |
473043dc | 660 | if (inode->i_nlink == 0) |
1da177e4 LT |
661 | inode->i_blocks = 0; |
662 | iput(inode); | |
1da177e4 | 663 | } |
1da177e4 | 664 | brelse(bitmap_bh); |
473043dc DH |
665 | error: |
666 | return ERR_PTR(err); | |
1da177e4 LT |
667 | } |
668 | ||
669 | unsigned long ext3_count_free_inodes (struct super_block * sb) | |
670 | { | |
671 | unsigned long desc_count; | |
672 | struct ext3_group_desc *gdp; | |
673 | int i; | |
674 | #ifdef EXT3FS_DEBUG | |
675 | struct ext3_super_block *es; | |
676 | unsigned long bitmap_count, x; | |
677 | struct buffer_head *bitmap_bh = NULL; | |
678 | ||
1da177e4 LT |
679 | es = EXT3_SB(sb)->s_es; |
680 | desc_count = 0; | |
681 | bitmap_count = 0; | |
682 | gdp = NULL; | |
683 | for (i = 0; i < EXT3_SB(sb)->s_groups_count; i++) { | |
684 | gdp = ext3_get_group_desc (sb, i, NULL); | |
685 | if (!gdp) | |
686 | continue; | |
687 | desc_count += le16_to_cpu(gdp->bg_free_inodes_count); | |
688 | brelse(bitmap_bh); | |
689 | bitmap_bh = read_inode_bitmap(sb, i); | |
690 | if (!bitmap_bh) | |
691 | continue; | |
692 | ||
693 | x = ext3_count_free(bitmap_bh, EXT3_INODES_PER_GROUP(sb) / 8); | |
694 | printk("group %d: stored = %d, counted = %lu\n", | |
695 | i, le16_to_cpu(gdp->bg_free_inodes_count), x); | |
696 | bitmap_count += x; | |
697 | } | |
698 | brelse(bitmap_bh); | |
699 | printk("ext3_count_free_inodes: stored = %u, computed = %lu, %lu\n", | |
700 | le32_to_cpu(es->s_free_inodes_count), desc_count, bitmap_count); | |
1da177e4 LT |
701 | return desc_count; |
702 | #else | |
703 | desc_count = 0; | |
704 | for (i = 0; i < EXT3_SB(sb)->s_groups_count; i++) { | |
705 | gdp = ext3_get_group_desc (sb, i, NULL); | |
706 | if (!gdp) | |
707 | continue; | |
708 | desc_count += le16_to_cpu(gdp->bg_free_inodes_count); | |
709 | cond_resched(); | |
710 | } | |
711 | return desc_count; | |
712 | #endif | |
713 | } | |
714 | ||
715 | /* Called at mount-time, super-block is locked */ | |
716 | unsigned long ext3_count_dirs (struct super_block * sb) | |
717 | { | |
718 | unsigned long count = 0; | |
719 | int i; | |
720 | ||
721 | for (i = 0; i < EXT3_SB(sb)->s_groups_count; i++) { | |
722 | struct ext3_group_desc *gdp = ext3_get_group_desc (sb, i, NULL); | |
723 | if (!gdp) | |
724 | continue; | |
725 | count += le16_to_cpu(gdp->bg_used_dirs_count); | |
726 | } | |
727 | return count; | |
728 | } | |
729 |