blob: cd7f5f424a757a9717ebf4f0a7e863ccd1d202b1 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * linux/fs/ext2/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@dcs.ed.ac.uk), 1993
11 * Big-endian to little-endian byte-swapping/bitmaps by
12 * David S. Miller (davem@caip.rutgers.edu), 1995
13 */
14
Linus Torvalds1da177e2005-04-16 15:20:36 -070015#include <linux/quotaops.h>
16#include <linux/sched.h>
17#include <linux/backing-dev.h>
18#include <linux/buffer_head.h>
19#include <linux/random.h>
20#include "ext2.h"
21#include "xattr.h"
22#include "acl.h"
23
24/*
25 * ialloc.c contains the inodes allocation and deallocation routines
26 */
27
28/*
29 * The free inodes are managed by bitmaps. A file system contains several
30 * blocks groups. Each group contains 1 bitmap block for blocks, 1 bitmap
31 * block for inodes, N blocks for the inode table and data blocks.
32 *
33 * The file system contains group descriptors which are located after the
34 * super block. Each descriptor contains the number of the bitmap block and
35 * the free blocks count in the block.
36 */
37
38
39/*
40 * Read the inode allocation bitmap for a given block_group, reading
41 * into the specified slot in the superblock's bitmap cache.
42 *
43 * Return buffer_head of bitmap on success or NULL.
44 */
45static struct buffer_head *
46read_inode_bitmap(struct super_block * sb, unsigned long block_group)
47{
48 struct ext2_group_desc *desc;
49 struct buffer_head *bh = NULL;
50
51 desc = ext2_get_group_desc(sb, block_group, NULL);
52 if (!desc)
53 goto error_out;
54
55 bh = sb_bread(sb, le32_to_cpu(desc->bg_inode_bitmap));
56 if (!bh)
57 ext2_error(sb, "read_inode_bitmap",
58 "Cannot read inode bitmap - "
59 "block_group = %lu, inode_bitmap = %u",
60 block_group, le32_to_cpu(desc->bg_inode_bitmap));
61error_out:
62 return bh;
63}
64
65static void ext2_release_inode(struct super_block *sb, int group, int dir)
66{
67 struct ext2_group_desc * desc;
68 struct buffer_head *bh;
69
70 desc = ext2_get_group_desc(sb, group, &bh);
71 if (!desc) {
72 ext2_error(sb, "ext2_release_inode",
73 "can't get descriptor for group %d", group);
74 return;
75 }
76
77 spin_lock(sb_bgl_lock(EXT2_SB(sb), group));
Marcin Slusarzfba4d392008-04-28 02:15:59 -070078 le16_add_cpu(&desc->bg_free_inodes_count, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -070079 if (dir)
Marcin Slusarzfba4d392008-04-28 02:15:59 -070080 le16_add_cpu(&desc->bg_used_dirs_count, -1);
Linus Torvalds1da177e2005-04-16 15:20:36 -070081 spin_unlock(sb_bgl_lock(EXT2_SB(sb), group));
82 if (dir)
83 percpu_counter_dec(&EXT2_SB(sb)->s_dirs_counter);
84 sb->s_dirt = 1;
85 mark_buffer_dirty(bh);
86}
87
88/*
89 * NOTE! When we get the inode, we're the only people
90 * that have access to it, and as such there are no
91 * race conditions we have to worry about. The inode
92 * is not on the hash-lists, and it cannot be reached
93 * through the filesystem because the directory entry
94 * has been deleted earlier.
95 *
96 * HOWEVER: we must make sure that we get no aliases,
97 * which means that we have to call "clear_inode()"
98 * _before_ we mark the inode not in use in the inode
99 * bitmaps. Otherwise a newly created file might use
100 * the same inode number (not actually the same pointer
101 * though), and then we'd have two inodes sharing the
102 * same inode number and space on the harddisk.
103 */
104void ext2_free_inode (struct inode * inode)
105{
106 struct super_block * sb = inode->i_sb;
107 int is_directory;
108 unsigned long ino;
Francis Moreau524e4a12010-04-08 11:35:17 +0200109 struct buffer_head *bitmap_bh;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110 unsigned long block_group;
111 unsigned long bit;
112 struct ext2_super_block * es;
113
114 ino = inode->i_ino;
115 ext2_debug ("freeing inode %lu\n", ino);
116
117 /*
118 * Note: we must free any quota before locking the superblock,
119 * as writing the quota to disk may need the lock as well.
120 */
Al Viro72edc4d2010-06-04 23:32:28 -0400121 /* Quota is already initialized in iput() */
122 ext2_xattr_delete_inode(inode);
123 dquot_free_inode(inode);
124 dquot_drop(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125
126 es = EXT2_SB(sb)->s_es;
127 is_directory = S_ISDIR(inode->i_mode);
128
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129 if (ino < EXT2_FIRST_INO(sb) ||
130 ino > le32_to_cpu(es->s_inodes_count)) {
131 ext2_error (sb, "ext2_free_inode",
132 "reserved or nonexistent inode %lu", ino);
Francis Moreau524e4a12010-04-08 11:35:17 +0200133 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134 }
135 block_group = (ino - 1) / EXT2_INODES_PER_GROUP(sb);
136 bit = (ino - 1) % EXT2_INODES_PER_GROUP(sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137 bitmap_bh = read_inode_bitmap(sb, block_group);
138 if (!bitmap_bh)
Francis Moreau524e4a12010-04-08 11:35:17 +0200139 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140
141 /* Ok, now we can actually update the inode bitmaps.. */
142 if (!ext2_clear_bit_atomic(sb_bgl_lock(EXT2_SB(sb), block_group),
143 bit, (void *) bitmap_bh->b_data))
144 ext2_error (sb, "ext2_free_inode",
145 "bit already cleared for inode %lu", ino);
146 else
147 ext2_release_inode(sb, block_group, is_directory);
148 mark_buffer_dirty(bitmap_bh);
149 if (sb->s_flags & MS_SYNCHRONOUS)
150 sync_dirty_buffer(bitmap_bh);
Francis Moreau524e4a12010-04-08 11:35:17 +0200151
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152 brelse(bitmap_bh);
153}
154
155/*
156 * We perform asynchronous prereading of the new inode's inode block when
157 * we create the inode, in the expectation that the inode will be written
158 * back soon. There are two reasons:
159 *
160 * - When creating a large number of files, the async prereads will be
161 * nicely merged into large reads
162 * - When writing out a large number of inodes, we don't need to keep on
163 * stalling the writes while we read the inode block.
164 *
165 * FIXME: ext2_get_group_desc() needs to be simplified.
166 */
167static void ext2_preread_inode(struct inode *inode)
168{
169 unsigned long block_group;
170 unsigned long offset;
171 unsigned long block;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172 struct ext2_group_desc * gdp;
173 struct backing_dev_info *bdi;
174
175 bdi = inode->i_mapping->backing_dev_info;
176 if (bdi_read_congested(bdi))
177 return;
178 if (bdi_write_congested(bdi))
179 return;
180
181 block_group = (inode->i_ino - 1) / EXT2_INODES_PER_GROUP(inode->i_sb);
Eric Sandeenef2fb672007-10-16 23:26:30 -0700182 gdp = ext2_get_group_desc(inode->i_sb, block_group, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183 if (gdp == NULL)
184 return;
185
186 /*
187 * Figure out the offset within the block group inode table
188 */
189 offset = ((inode->i_ino - 1) % EXT2_INODES_PER_GROUP(inode->i_sb)) *
190 EXT2_INODE_SIZE(inode->i_sb);
191 block = le32_to_cpu(gdp->bg_inode_table) +
192 (offset >> EXT2_BLOCK_SIZE_BITS(inode->i_sb));
193 sb_breadahead(inode->i_sb, block);
194}
195
196/*
197 * There are two policies for allocating an inode. If the new inode is
198 * a directory, then a forward search is made for a block group with both
199 * free space and a low directory-to-inode ratio; if that fails, then of
200 * the groups with above-average free space, that group with the fewest
201 * directories already is chosen.
202 *
203 * For other inodes, search forward from the parent directory\'s block
204 * group to find a free inode.
205 */
206static int find_group_dir(struct super_block *sb, struct inode *parent)
207{
208 int ngroups = EXT2_SB(sb)->s_groups_count;
209 int avefreei = ext2_count_free_inodes(sb) / ngroups;
210 struct ext2_group_desc *desc, *best_desc = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211 int group, best_group = -1;
212
213 for (group = 0; group < ngroups; group++) {
Eric Sandeenef2fb672007-10-16 23:26:30 -0700214 desc = ext2_get_group_desc (sb, group, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215 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;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224 }
225 }
226 if (!best_desc)
227 return -1;
228
229 return best_group;
230}
231
232/*
233 * Orlov's allocator for directories.
234 *
235 * We always try to spread first-level directories.
236 *
237 * If there are blockgroups with both free inodes and free blocks counts
238 * not worse than average we return one with smallest directory count.
239 * Otherwise we simply return a random group.
240 *
241 * For the rest rules look so:
242 *
243 * It's OK to put directory into a group unless
244 * it has too many directories already (max_dirs) or
245 * it has too few free inodes left (min_inodes) or
246 * it has too few free blocks left (min_blocks) or
247 * it's already running too large debt (max_debt).
Benoit Boissinot1cc8dcf2008-04-21 22:45:55 +0000248 * Parent's group is preferred, if it doesn't satisfy these
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249 * conditions we search cyclically through the rest. If none
250 * of the groups look good we just look for a group with more
251 * free inodes than average (starting at parent's group).
252 *
253 * Debt is incremented each time we allocate a directory and decremented
254 * when we allocate an inode, within 0--255.
255 */
256
257#define INODE_COST 64
258#define BLOCK_COST 256
259
260static int find_group_orlov(struct super_block *sb, struct inode *parent)
261{
262 int parent_group = EXT2_I(parent)->i_block_group;
263 struct ext2_sb_info *sbi = EXT2_SB(sb);
264 struct ext2_super_block *es = sbi->s_es;
265 int ngroups = sbi->s_groups_count;
266 int inodes_per_group = EXT2_INODES_PER_GROUP(sb);
267 int freei;
268 int avefreei;
269 int free_blocks;
270 int avefreeb;
271 int blocks_per_dir;
272 int ndirs;
273 int max_debt, max_dirs, min_blocks, min_inodes;
274 int group = -1, i;
275 struct ext2_group_desc *desc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700276
277 freei = percpu_counter_read_positive(&sbi->s_freeinodes_counter);
278 avefreei = freei / ngroups;
279 free_blocks = percpu_counter_read_positive(&sbi->s_freeblocks_counter);
280 avefreeb = free_blocks / ngroups;
281 ndirs = percpu_counter_read_positive(&sbi->s_dirs_counter);
282
283 if ((parent == sb->s_root->d_inode) ||
284 (EXT2_I(parent)->i_flags & EXT2_TOPDIR_FL)) {
285 struct ext2_group_desc *best_desc = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700286 int best_ndir = inodes_per_group;
287 int best_group = -1;
288
289 get_random_bytes(&group, sizeof(group));
290 parent_group = (unsigned)group % ngroups;
291 for (i = 0; i < ngroups; i++) {
292 group = (parent_group + i) % ngroups;
Eric Sandeenef2fb672007-10-16 23:26:30 -0700293 desc = ext2_get_group_desc (sb, group, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294 if (!desc || !desc->bg_free_inodes_count)
295 continue;
296 if (le16_to_cpu(desc->bg_used_dirs_count) >= best_ndir)
297 continue;
298 if (le16_to_cpu(desc->bg_free_inodes_count) < avefreei)
299 continue;
300 if (le16_to_cpu(desc->bg_free_blocks_count) < avefreeb)
301 continue;
302 best_group = group;
303 best_ndir = le16_to_cpu(desc->bg_used_dirs_count);
304 best_desc = desc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700305 }
306 if (best_group >= 0) {
307 desc = best_desc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700308 group = best_group;
309 goto found;
310 }
311 goto fallback;
312 }
313
314 if (ndirs == 0)
315 ndirs = 1; /* percpu_counters are approximate... */
316
317 blocks_per_dir = (le32_to_cpu(es->s_blocks_count)-free_blocks) / ndirs;
318
319 max_dirs = ndirs / ngroups + inodes_per_group / 16;
320 min_inodes = avefreei - inodes_per_group / 4;
321 min_blocks = avefreeb - EXT2_BLOCKS_PER_GROUP(sb) / 4;
322
323 max_debt = EXT2_BLOCKS_PER_GROUP(sb) / max(blocks_per_dir, BLOCK_COST);
324 if (max_debt * INODE_COST > inodes_per_group)
325 max_debt = inodes_per_group / INODE_COST;
326 if (max_debt > 255)
327 max_debt = 255;
328 if (max_debt == 0)
329 max_debt = 1;
330
331 for (i = 0; i < ngroups; i++) {
332 group = (parent_group + i) % ngroups;
Eric Sandeenef2fb672007-10-16 23:26:30 -0700333 desc = ext2_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 (sbi->s_debts[group] >= max_debt)
337 continue;
338 if (le16_to_cpu(desc->bg_used_dirs_count) >= max_dirs)
339 continue;
340 if (le16_to_cpu(desc->bg_free_inodes_count) < min_inodes)
341 continue;
342 if (le16_to_cpu(desc->bg_free_blocks_count) < min_blocks)
343 continue;
344 goto found;
345 }
346
347fallback:
348 for (i = 0; i < ngroups; i++) {
349 group = (parent_group + i) % ngroups;
Eric Sandeenef2fb672007-10-16 23:26:30 -0700350 desc = ext2_get_group_desc (sb, group, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351 if (!desc || !desc->bg_free_inodes_count)
352 continue;
353 if (le16_to_cpu(desc->bg_free_inodes_count) >= avefreei)
354 goto found;
355 }
356
357 if (avefreei) {
358 /*
359 * The free-inodes counter is approximate, and for really small
360 * filesystems the above test can fail to find any blockgroups
361 */
362 avefreei = 0;
363 goto fallback;
364 }
365
366 return -1;
367
368found:
369 return group;
370}
371
372static int find_group_other(struct super_block *sb, struct inode *parent)
373{
374 int parent_group = EXT2_I(parent)->i_block_group;
375 int ngroups = EXT2_SB(sb)->s_groups_count;
376 struct ext2_group_desc *desc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700377 int group, i;
378
379 /*
380 * Try to place the inode in its parent directory
381 */
382 group = parent_group;
Eric Sandeenef2fb672007-10-16 23:26:30 -0700383 desc = ext2_get_group_desc (sb, group, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700384 if (desc && le16_to_cpu(desc->bg_free_inodes_count) &&
385 le16_to_cpu(desc->bg_free_blocks_count))
386 goto found;
387
388 /*
389 * We're going to place this inode in a different blockgroup from its
390 * parent. We want to cause files in a common directory to all land in
391 * the same blockgroup. But we want files which are in a different
392 * directory which shares a blockgroup with our parent to land in a
393 * different blockgroup.
394 *
395 * So add our directory's i_ino into the starting point for the hash.
396 */
397 group = (group + parent->i_ino) % ngroups;
398
399 /*
400 * Use a quadratic hash to find a group with a free inode and some
401 * free blocks.
402 */
403 for (i = 1; i < ngroups; i <<= 1) {
404 group += i;
405 if (group >= ngroups)
406 group -= ngroups;
Eric Sandeenef2fb672007-10-16 23:26:30 -0700407 desc = ext2_get_group_desc (sb, group, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700408 if (desc && le16_to_cpu(desc->bg_free_inodes_count) &&
409 le16_to_cpu(desc->bg_free_blocks_count))
410 goto found;
411 }
412
413 /*
414 * That failed: try linear search for a free inode, even if that group
415 * has no free blocks.
416 */
417 group = parent_group;
418 for (i = 0; i < ngroups; i++) {
419 if (++group >= ngroups)
420 group = 0;
Eric Sandeenef2fb672007-10-16 23:26:30 -0700421 desc = ext2_get_group_desc (sb, group, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700422 if (desc && le16_to_cpu(desc->bg_free_inodes_count))
423 goto found;
424 }
425
426 return -1;
427
428found:
429 return group;
430}
431
Al Viro3ea40bc2011-07-26 02:46:18 -0400432struct inode *ext2_new_inode(struct inode *dir, umode_t mode,
Eric Paris2a7dba32011-02-01 11:05:39 -0500433 const struct qstr *qstr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700434{
435 struct super_block *sb;
436 struct buffer_head *bitmap_bh = NULL;
437 struct buffer_head *bh2;
438 int group, i;
439 ino_t ino = 0;
440 struct inode * inode;
441 struct ext2_group_desc *gdp;
442 struct ext2_super_block *es;
443 struct ext2_inode_info *ei;
444 struct ext2_sb_info *sbi;
445 int err;
446
447 sb = dir->i_sb;
448 inode = new_inode(sb);
449 if (!inode)
450 return ERR_PTR(-ENOMEM);
451
452 ei = EXT2_I(inode);
453 sbi = EXT2_SB(sb);
454 es = sbi->s_es;
455 if (S_ISDIR(mode)) {
456 if (test_opt(sb, OLDALLOC))
457 group = find_group_dir(sb, dir);
458 else
459 group = find_group_orlov(sb, dir);
460 } else
461 group = find_group_other(sb, dir);
462
463 if (group == -1) {
464 err = -ENOSPC;
465 goto fail;
466 }
467
468 for (i = 0; i < sbi->s_groups_count; i++) {
469 gdp = ext2_get_group_desc(sb, group, &bh2);
470 brelse(bitmap_bh);
471 bitmap_bh = read_inode_bitmap(sb, group);
472 if (!bitmap_bh) {
473 err = -EIO;
474 goto fail;
475 }
476 ino = 0;
477
478repeat_in_this_group:
479 ino = ext2_find_next_zero_bit((unsigned long *)bitmap_bh->b_data,
480 EXT2_INODES_PER_GROUP(sb), ino);
481 if (ino >= EXT2_INODES_PER_GROUP(sb)) {
482 /*
483 * Rare race: find_group_xx() decided that there were
484 * free inodes in this group, but by the time we tried
485 * to allocate one, they're all gone. This can also
486 * occur because the counters which find_group_orlov()
487 * uses are approximate. So just go and search the
488 * next block group.
489 */
490 if (++group == sbi->s_groups_count)
491 group = 0;
492 continue;
493 }
494 if (ext2_set_bit_atomic(sb_bgl_lock(sbi, group),
495 ino, bitmap_bh->b_data)) {
496 /* we lost this inode */
497 if (++ino >= EXT2_INODES_PER_GROUP(sb)) {
498 /* this group is exhausted, try next group */
499 if (++group == sbi->s_groups_count)
500 group = 0;
501 continue;
502 }
503 /* try to find free inode in the same group */
504 goto repeat_in_this_group;
505 }
506 goto got;
507 }
508
509 /*
510 * Scanned all blockgroups.
511 */
512 err = -ENOSPC;
513 goto fail;
514got:
515 mark_buffer_dirty(bitmap_bh);
516 if (sb->s_flags & MS_SYNCHRONOUS)
517 sync_dirty_buffer(bitmap_bh);
518 brelse(bitmap_bh);
519
520 ino += group * EXT2_INODES_PER_GROUP(sb) + 1;
521 if (ino < EXT2_FIRST_INO(sb) || ino > le32_to_cpu(es->s_inodes_count)) {
522 ext2_error (sb, "ext2_new_inode",
523 "reserved inode or inode > inodes count - "
524 "block_group = %d,inode=%lu", group,
525 (unsigned long) ino);
526 err = -EIO;
527 goto fail;
528 }
529
Peter Zijlstraaa0dff22007-10-16 23:25:42 -0700530 percpu_counter_add(&sbi->s_freeinodes_counter, -1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700531 if (S_ISDIR(mode))
532 percpu_counter_inc(&sbi->s_dirs_counter);
533
534 spin_lock(sb_bgl_lock(sbi, group));
Marcin Slusarzfba4d392008-04-28 02:15:59 -0700535 le16_add_cpu(&gdp->bg_free_inodes_count, -1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700536 if (S_ISDIR(mode)) {
537 if (sbi->s_debts[group] < 255)
538 sbi->s_debts[group]++;
Marcin Slusarzfba4d392008-04-28 02:15:59 -0700539 le16_add_cpu(&gdp->bg_used_dirs_count, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700540 } else {
541 if (sbi->s_debts[group])
542 sbi->s_debts[group]--;
543 }
544 spin_unlock(sb_bgl_lock(sbi, group));
545
546 sb->s_dirt = 1;
547 mark_buffer_dirty(bh2);
Dmitry Monakhovffba1022010-03-04 17:31:49 +0300548 if (test_opt(sb, GRPID)) {
549 inode->i_mode = mode;
550 inode->i_uid = current_fsuid();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700551 inode->i_gid = dir->i_gid;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700552 } else
Dmitry Monakhovffba1022010-03-04 17:31:49 +0300553 inode_init_owner(inode, dir, mode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700554
555 inode->i_ino = ino;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700556 inode->i_blocks = 0;
557 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC;
558 memset(ei->i_data, 0, sizeof(ei->i_data));
Duane Griffinef8b6462009-01-07 18:07:21 -0800559 ei->i_flags =
560 ext2_mask_flags(mode, EXT2_I(dir)->i_flags & EXT2_FL_INHERITED);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700561 ei->i_faddr = 0;
562 ei->i_frag_no = 0;
563 ei->i_frag_size = 0;
564 ei->i_file_acl = 0;
565 ei->i_dir_acl = 0;
566 ei->i_dtime = 0;
Martin J. Bligha686cd82007-10-16 23:30:46 -0700567 ei->i_block_alloc_info = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700568 ei->i_block_group = group;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700569 ei->i_dir_start_lookup = 0;
570 ei->i_state = EXT2_STATE_NEW;
571 ext2_set_inode_flags(inode);
572 spin_lock(&sbi->s_next_gen_lock);
573 inode->i_generation = sbi->s_next_generation++;
574 spin_unlock(&sbi->s_next_gen_lock);
Al Viro41080b52008-12-30 01:52:35 -0500575 if (insert_inode_locked(inode) < 0) {
576 err = -EINVAL;
577 goto fail_drop;
578 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700579
Christoph Hellwig871a2932010-03-03 09:05:07 -0500580 dquot_initialize(inode);
Christoph Hellwig63936dd2010-03-03 09:05:01 -0500581 err = dquot_alloc_inode(inode);
582 if (err)
Chris Sykes9ed6c2f2005-09-27 21:45:22 -0700583 goto fail_drop;
Chris Sykes9ed6c2f2005-09-27 21:45:22 -0700584
Linus Torvalds1da177e2005-04-16 15:20:36 -0700585 err = ext2_init_acl(inode, dir);
Chris Sykes9ed6c2f2005-09-27 21:45:22 -0700586 if (err)
587 goto fail_free_drop;
588
Eric Paris2a7dba32011-02-01 11:05:39 -0500589 err = ext2_init_security(inode, dir, qstr);
Chris Sykes9ed6c2f2005-09-27 21:45:22 -0700590 if (err)
591 goto fail_free_drop;
592
Linus Torvalds1da177e2005-04-16 15:20:36 -0700593 mark_inode_dirty(inode);
594 ext2_debug("allocating inode %lu\n", inode->i_ino);
595 ext2_preread_inode(inode);
596 return inode;
597
Chris Sykes9ed6c2f2005-09-27 21:45:22 -0700598fail_free_drop:
Christoph Hellwig63936dd2010-03-03 09:05:01 -0500599 dquot_free_inode(inode);
Chris Sykes9ed6c2f2005-09-27 21:45:22 -0700600
601fail_drop:
Christoph Hellwig9f754752010-03-03 09:05:05 -0500602 dquot_drop(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700603 inode->i_flags |= S_NOQUOTA;
Miklos Szeredi6d6b77f2011-10-28 14:13:28 +0200604 clear_nlink(inode);
Al Viro41080b52008-12-30 01:52:35 -0500605 unlock_new_inode(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700606 iput(inode);
607 return ERR_PTR(err);
608
609fail:
610 make_bad_inode(inode);
611 iput(inode);
612 return ERR_PTR(err);
613}
614
615unsigned long ext2_count_free_inodes (struct super_block * sb)
616{
617 struct ext2_group_desc *desc;
618 unsigned long desc_count = 0;
619 int i;
620
621#ifdef EXT2FS_DEBUG
622 struct ext2_super_block *es;
623 unsigned long bitmap_count = 0;
624 struct buffer_head *bitmap_bh = NULL;
625
Linus Torvalds1da177e2005-04-16 15:20:36 -0700626 es = EXT2_SB(sb)->s_es;
627 for (i = 0; i < EXT2_SB(sb)->s_groups_count; i++) {
628 unsigned x;
629
630 desc = ext2_get_group_desc (sb, i, NULL);
631 if (!desc)
632 continue;
633 desc_count += le16_to_cpu(desc->bg_free_inodes_count);
634 brelse(bitmap_bh);
635 bitmap_bh = read_inode_bitmap(sb, i);
636 if (!bitmap_bh)
637 continue;
638
639 x = ext2_count_free(bitmap_bh, EXT2_INODES_PER_GROUP(sb) / 8);
640 printk("group %d: stored = %d, counted = %u\n",
641 i, le16_to_cpu(desc->bg_free_inodes_count), x);
642 bitmap_count += x;
643 }
644 brelse(bitmap_bh);
645 printk("ext2_count_free_inodes: stored = %lu, computed = %lu, %lu\n",
646 percpu_counter_read(&EXT2_SB(sb)->s_freeinodes_counter),
647 desc_count, bitmap_count);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700648 return desc_count;
649#else
650 for (i = 0; i < EXT2_SB(sb)->s_groups_count; i++) {
651 desc = ext2_get_group_desc (sb, i, NULL);
652 if (!desc)
653 continue;
654 desc_count += le16_to_cpu(desc->bg_free_inodes_count);
655 }
656 return desc_count;
657#endif
658}
659
660/* Called at mount-time, super-block is locked */
661unsigned long ext2_count_dirs (struct super_block * sb)
662{
663 unsigned long count = 0;
664 int i;
665
666 for (i = 0; i < EXT2_SB(sb)->s_groups_count; i++) {
667 struct ext2_group_desc *gdp = ext2_get_group_desc (sb, i, NULL);
668 if (!gdp)
669 continue;
670 count += le16_to_cpu(gdp->bg_used_dirs_count);
671 }
672 return count;
673}
674