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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * linux/fs/ext4/ialloc.c
4 *
5 * Copyright (C) 1992, 1993, 1994, 1995
6 * Remy Card (card@masi.ibp.fr)
7 * Laboratoire MASI - Institut Blaise Pascal
8 * Universite Pierre et Marie Curie (Paris VI)
9 *
10 * BSD ufs-inspired inode and directory allocation by
11 * Stephen Tweedie (sct@redhat.com), 1993
12 * Big-endian to little-endian byte-swapping/bitmaps by
13 * David S. Miller (davem@caip.rutgers.edu), 1995
14 */
15
16#include <linux/time.h>
17#include <linux/fs.h>
18#include <linux/stat.h>
19#include <linux/string.h>
20#include <linux/quotaops.h>
21#include <linux/buffer_head.h>
22#include <linux/random.h>
23#include <linux/bitops.h>
24#include <linux/blkdev.h>
25#include <linux/cred.h>
26
27#include <asm/byteorder.h>
28
29#include "ext4.h"
30#include "ext4_jbd2.h"
31#include "xattr.h"
32#include "acl.h"
33
34#include <trace/events/ext4.h>
35
36/*
37 * ialloc.c contains the inodes allocation and deallocation routines
38 */
39
40/*
41 * The free inodes are managed by bitmaps. A file system contains several
42 * blocks groups. Each group contains 1 bitmap block for blocks, 1 bitmap
43 * block for inodes, N blocks for the inode table and data blocks.
44 *
45 * The file system contains group descriptors which are located after the
46 * super block. Each descriptor contains the number of the bitmap block and
47 * the free blocks count in the block.
48 */
49
50/*
51 * To avoid calling the atomic setbit hundreds or thousands of times, we only
52 * need to use it within a single byte (to ensure we get endianness right).
53 * We can use memset for the rest of the bitmap as there are no other users.
54 */
55void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap)
56{
57 int i;
58
59 if (start_bit >= end_bit)
60 return;
61
62 ext4_debug("mark end bits +%d through +%d used\n", start_bit, end_bit);
63 for (i = start_bit; i < ((start_bit + 7) & ~7UL); i++)
64 ext4_set_bit(i, bitmap);
65 if (i < end_bit)
66 memset(bitmap + (i >> 3), 0xff, (end_bit - i) >> 3);
67}
68
69void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate)
70{
71 if (uptodate) {
72 set_buffer_uptodate(bh);
73 set_bitmap_uptodate(bh);
74 }
75 unlock_buffer(bh);
76 put_bh(bh);
77}
78
79static int ext4_validate_inode_bitmap(struct super_block *sb,
80 struct ext4_group_desc *desc,
81 ext4_group_t block_group,
82 struct buffer_head *bh)
83{
84 ext4_fsblk_t blk;
85 struct ext4_group_info *grp;
86
87 if (EXT4_SB(sb)->s_mount_state & EXT4_FC_REPLAY)
88 return 0;
89
90 grp = ext4_get_group_info(sb, block_group);
91
92 if (buffer_verified(bh))
93 return 0;
94 if (EXT4_MB_GRP_IBITMAP_CORRUPT(grp))
95 return -EFSCORRUPTED;
96
97 ext4_lock_group(sb, block_group);
98 if (buffer_verified(bh))
99 goto verified;
100 blk = ext4_inode_bitmap(sb, desc);
101 if (!ext4_inode_bitmap_csum_verify(sb, block_group, desc, bh,
102 EXT4_INODES_PER_GROUP(sb) / 8) ||
103 ext4_simulate_fail(sb, EXT4_SIM_IBITMAP_CRC)) {
104 ext4_unlock_group(sb, block_group);
105 ext4_error(sb, "Corrupt inode bitmap - block_group = %u, "
106 "inode_bitmap = %llu", block_group, blk);
107 ext4_mark_group_bitmap_corrupted(sb, block_group,
108 EXT4_GROUP_INFO_IBITMAP_CORRUPT);
109 return -EFSBADCRC;
110 }
111 set_buffer_verified(bh);
112verified:
113 ext4_unlock_group(sb, block_group);
114 return 0;
115}
116
117/*
118 * Read the inode allocation bitmap for a given block_group, reading
119 * into the specified slot in the superblock's bitmap cache.
120 *
121 * Return buffer_head of bitmap on success, or an ERR_PTR on error.
122 */
123static struct buffer_head *
124ext4_read_inode_bitmap(struct super_block *sb, ext4_group_t block_group)
125{
126 struct ext4_group_desc *desc;
127 struct ext4_sb_info *sbi = EXT4_SB(sb);
128 struct buffer_head *bh = NULL;
129 ext4_fsblk_t bitmap_blk;
130 int err;
131
132 desc = ext4_get_group_desc(sb, block_group, NULL);
133 if (!desc)
134 return ERR_PTR(-EFSCORRUPTED);
135
136 bitmap_blk = ext4_inode_bitmap(sb, desc);
137 if ((bitmap_blk <= le32_to_cpu(sbi->s_es->s_first_data_block)) ||
138 (bitmap_blk >= ext4_blocks_count(sbi->s_es))) {
139 ext4_error(sb, "Invalid inode bitmap blk %llu in "
140 "block_group %u", bitmap_blk, block_group);
141 ext4_mark_group_bitmap_corrupted(sb, block_group,
142 EXT4_GROUP_INFO_IBITMAP_CORRUPT);
143 return ERR_PTR(-EFSCORRUPTED);
144 }
145 bh = sb_getblk(sb, bitmap_blk);
146 if (unlikely(!bh)) {
147 ext4_warning(sb, "Cannot read inode bitmap - "
148 "block_group = %u, inode_bitmap = %llu",
149 block_group, bitmap_blk);
150 return ERR_PTR(-ENOMEM);
151 }
152 if (bitmap_uptodate(bh))
153 goto verify;
154
155 lock_buffer(bh);
156 if (bitmap_uptodate(bh)) {
157 unlock_buffer(bh);
158 goto verify;
159 }
160
161 ext4_lock_group(sb, block_group);
162 if (ext4_has_group_desc_csum(sb) &&
163 (desc->bg_flags & cpu_to_le16(EXT4_BG_INODE_UNINIT))) {
164 if (block_group == 0) {
165 ext4_unlock_group(sb, block_group);
166 unlock_buffer(bh);
167 ext4_error(sb, "Inode bitmap for bg 0 marked "
168 "uninitialized");
169 err = -EFSCORRUPTED;
170 goto out;
171 }
172 memset(bh->b_data, 0, (EXT4_INODES_PER_GROUP(sb) + 7) / 8);
173 ext4_mark_bitmap_end(EXT4_INODES_PER_GROUP(sb),
174 sb->s_blocksize * 8, bh->b_data);
175 set_bitmap_uptodate(bh);
176 set_buffer_uptodate(bh);
177 set_buffer_verified(bh);
178 ext4_unlock_group(sb, block_group);
179 unlock_buffer(bh);
180 return bh;
181 }
182 ext4_unlock_group(sb, block_group);
183
184 if (buffer_uptodate(bh)) {
185 /*
186 * if not uninit if bh is uptodate,
187 * bitmap is also uptodate
188 */
189 set_bitmap_uptodate(bh);
190 unlock_buffer(bh);
191 goto verify;
192 }
193 /*
194 * submit the buffer_head for reading
195 */
196 trace_ext4_load_inode_bitmap(sb, block_group);
197 ext4_read_bh(bh, REQ_META | REQ_PRIO, ext4_end_bitmap_read);
198 ext4_simulate_fail_bh(sb, bh, EXT4_SIM_IBITMAP_EIO);
199 if (!buffer_uptodate(bh)) {
200 put_bh(bh);
201 ext4_error_err(sb, EIO, "Cannot read inode bitmap - "
202 "block_group = %u, inode_bitmap = %llu",
203 block_group, bitmap_blk);
204 ext4_mark_group_bitmap_corrupted(sb, block_group,
205 EXT4_GROUP_INFO_IBITMAP_CORRUPT);
206 return ERR_PTR(-EIO);
207 }
208
209verify:
210 err = ext4_validate_inode_bitmap(sb, desc, block_group, bh);
211 if (err)
212 goto out;
213 return bh;
214out:
215 put_bh(bh);
216 return ERR_PTR(err);
217}
218
219/*
220 * NOTE! When we get the inode, we're the only people
221 * that have access to it, and as such there are no
222 * race conditions we have to worry about. The inode
223 * is not on the hash-lists, and it cannot be reached
224 * through the filesystem because the directory entry
225 * has been deleted earlier.
226 *
227 * HOWEVER: we must make sure that we get no aliases,
228 * which means that we have to call "clear_inode()"
229 * _before_ we mark the inode not in use in the inode
230 * bitmaps. Otherwise a newly created file might use
231 * the same inode number (not actually the same pointer
232 * though), and then we'd have two inodes sharing the
233 * same inode number and space on the harddisk.
234 */
235void ext4_free_inode(handle_t *handle, struct inode *inode)
236{
237 struct super_block *sb = inode->i_sb;
238 int is_directory;
239 unsigned long ino;
240 struct buffer_head *bitmap_bh = NULL;
241 struct buffer_head *bh2;
242 ext4_group_t block_group;
243 unsigned long bit;
244 struct ext4_group_desc *gdp;
245 struct ext4_super_block *es;
246 struct ext4_sb_info *sbi;
247 int fatal = 0, err, count, cleared;
248 struct ext4_group_info *grp;
249
250 if (!sb) {
251 printk(KERN_ERR "EXT4-fs: %s:%d: inode on "
252 "nonexistent device\n", __func__, __LINE__);
253 return;
254 }
255 if (atomic_read(&inode->i_count) > 1) {
256 ext4_msg(sb, KERN_ERR, "%s:%d: inode #%lu: count=%d",
257 __func__, __LINE__, inode->i_ino,
258 atomic_read(&inode->i_count));
259 return;
260 }
261 if (inode->i_nlink) {
262 ext4_msg(sb, KERN_ERR, "%s:%d: inode #%lu: nlink=%d\n",
263 __func__, __LINE__, inode->i_ino, inode->i_nlink);
264 return;
265 }
266 sbi = EXT4_SB(sb);
267
268 ino = inode->i_ino;
269 ext4_debug("freeing inode %lu\n", ino);
270 trace_ext4_free_inode(inode);
271
272 dquot_initialize(inode);
273 dquot_free_inode(inode);
274
275 is_directory = S_ISDIR(inode->i_mode);
276
277 /* Do this BEFORE marking the inode not in use or returning an error */
278 ext4_clear_inode(inode);
279
280 es = sbi->s_es;
281 if (ino < EXT4_FIRST_INO(sb) || ino > le32_to_cpu(es->s_inodes_count)) {
282 ext4_error(sb, "reserved or nonexistent inode %lu", ino);
283 goto error_return;
284 }
285 block_group = (ino - 1) / EXT4_INODES_PER_GROUP(sb);
286 bit = (ino - 1) % EXT4_INODES_PER_GROUP(sb);
287 bitmap_bh = ext4_read_inode_bitmap(sb, block_group);
288 /* Don't bother if the inode bitmap is corrupt. */
289 if (IS_ERR(bitmap_bh)) {
290 fatal = PTR_ERR(bitmap_bh);
291 bitmap_bh = NULL;
292 goto error_return;
293 }
294 if (!(sbi->s_mount_state & EXT4_FC_REPLAY)) {
295 grp = ext4_get_group_info(sb, block_group);
296 if (unlikely(EXT4_MB_GRP_IBITMAP_CORRUPT(grp))) {
297 fatal = -EFSCORRUPTED;
298 goto error_return;
299 }
300 }
301
302 BUFFER_TRACE(bitmap_bh, "get_write_access");
303 fatal = ext4_journal_get_write_access(handle, sb, bitmap_bh,
304 EXT4_JTR_NONE);
305 if (fatal)
306 goto error_return;
307
308 fatal = -ESRCH;
309 gdp = ext4_get_group_desc(sb, block_group, &bh2);
310 if (gdp) {
311 BUFFER_TRACE(bh2, "get_write_access");
312 fatal = ext4_journal_get_write_access(handle, sb, bh2,
313 EXT4_JTR_NONE);
314 }
315 ext4_lock_group(sb, block_group);
316 cleared = ext4_test_and_clear_bit(bit, bitmap_bh->b_data);
317 if (fatal || !cleared) {
318 ext4_unlock_group(sb, block_group);
319 goto out;
320 }
321
322 count = ext4_free_inodes_count(sb, gdp) + 1;
323 ext4_free_inodes_set(sb, gdp, count);
324 if (is_directory) {
325 count = ext4_used_dirs_count(sb, gdp) - 1;
326 ext4_used_dirs_set(sb, gdp, count);
327 if (percpu_counter_initialized(&sbi->s_dirs_counter))
328 percpu_counter_dec(&sbi->s_dirs_counter);
329 }
330 ext4_inode_bitmap_csum_set(sb, block_group, gdp, bitmap_bh,
331 EXT4_INODES_PER_GROUP(sb) / 8);
332 ext4_group_desc_csum_set(sb, block_group, gdp);
333 ext4_unlock_group(sb, block_group);
334
335 if (percpu_counter_initialized(&sbi->s_freeinodes_counter))
336 percpu_counter_inc(&sbi->s_freeinodes_counter);
337 if (sbi->s_log_groups_per_flex) {
338 struct flex_groups *fg;
339
340 fg = sbi_array_rcu_deref(sbi, s_flex_groups,
341 ext4_flex_group(sbi, block_group));
342 atomic_inc(&fg->free_inodes);
343 if (is_directory)
344 atomic_dec(&fg->used_dirs);
345 }
346 BUFFER_TRACE(bh2, "call ext4_handle_dirty_metadata");
347 fatal = ext4_handle_dirty_metadata(handle, NULL, bh2);
348out:
349 if (cleared) {
350 BUFFER_TRACE(bitmap_bh, "call ext4_handle_dirty_metadata");
351 err = ext4_handle_dirty_metadata(handle, NULL, bitmap_bh);
352 if (!fatal)
353 fatal = err;
354 } else {
355 ext4_error(sb, "bit already cleared for inode %lu", ino);
356 ext4_mark_group_bitmap_corrupted(sb, block_group,
357 EXT4_GROUP_INFO_IBITMAP_CORRUPT);
358 }
359
360error_return:
361 brelse(bitmap_bh);
362 ext4_std_error(sb, fatal);
363}
364
365struct orlov_stats {
366 __u64 free_clusters;
367 __u32 free_inodes;
368 __u32 used_dirs;
369};
370
371/*
372 * Helper function for Orlov's allocator; returns critical information
373 * for a particular block group or flex_bg. If flex_size is 1, then g
374 * is a block group number; otherwise it is flex_bg number.
375 */
376static void get_orlov_stats(struct super_block *sb, ext4_group_t g,
377 int flex_size, struct orlov_stats *stats)
378{
379 struct ext4_group_desc *desc;
380
381 if (flex_size > 1) {
382 struct flex_groups *fg = sbi_array_rcu_deref(EXT4_SB(sb),
383 s_flex_groups, g);
384 stats->free_inodes = atomic_read(&fg->free_inodes);
385 stats->free_clusters = atomic64_read(&fg->free_clusters);
386 stats->used_dirs = atomic_read(&fg->used_dirs);
387 return;
388 }
389
390 desc = ext4_get_group_desc(sb, g, NULL);
391 if (desc) {
392 stats->free_inodes = ext4_free_inodes_count(sb, desc);
393 stats->free_clusters = ext4_free_group_clusters(sb, desc);
394 stats->used_dirs = ext4_used_dirs_count(sb, desc);
395 } else {
396 stats->free_inodes = 0;
397 stats->free_clusters = 0;
398 stats->used_dirs = 0;
399 }
400}
401
402/*
403 * Orlov's allocator for directories.
404 *
405 * We always try to spread first-level directories.
406 *
407 * If there are blockgroups with both free inodes and free clusters counts
408 * not worse than average we return one with smallest directory count.
409 * Otherwise we simply return a random group.
410 *
411 * For the rest rules look so:
412 *
413 * It's OK to put directory into a group unless
414 * it has too many directories already (max_dirs) or
415 * it has too few free inodes left (min_inodes) or
416 * it has too few free clusters left (min_clusters) or
417 * Parent's group is preferred, if it doesn't satisfy these
418 * conditions we search cyclically through the rest. If none
419 * of the groups look good we just look for a group with more
420 * free inodes than average (starting at parent's group).
421 */
422
423static int find_group_orlov(struct super_block *sb, struct inode *parent,
424 ext4_group_t *group, umode_t mode,
425 const struct qstr *qstr)
426{
427 ext4_group_t parent_group = EXT4_I(parent)->i_block_group;
428 struct ext4_sb_info *sbi = EXT4_SB(sb);
429 ext4_group_t real_ngroups = ext4_get_groups_count(sb);
430 int inodes_per_group = EXT4_INODES_PER_GROUP(sb);
431 unsigned int freei, avefreei, grp_free;
432 ext4_fsblk_t freec, avefreec;
433 unsigned int ndirs;
434 int max_dirs, min_inodes;
435 ext4_grpblk_t min_clusters;
436 ext4_group_t i, grp, g, ngroups;
437 struct ext4_group_desc *desc;
438 struct orlov_stats stats;
439 int flex_size = ext4_flex_bg_size(sbi);
440 struct dx_hash_info hinfo;
441
442 ngroups = real_ngroups;
443 if (flex_size > 1) {
444 ngroups = (real_ngroups + flex_size - 1) >>
445 sbi->s_log_groups_per_flex;
446 parent_group >>= sbi->s_log_groups_per_flex;
447 }
448
449 freei = percpu_counter_read_positive(&sbi->s_freeinodes_counter);
450 avefreei = freei / ngroups;
451 freec = percpu_counter_read_positive(&sbi->s_freeclusters_counter);
452 avefreec = freec;
453 do_div(avefreec, ngroups);
454 ndirs = percpu_counter_read_positive(&sbi->s_dirs_counter);
455
456 if (S_ISDIR(mode) &&
457 ((parent == d_inode(sb->s_root)) ||
458 (ext4_test_inode_flag(parent, EXT4_INODE_TOPDIR)))) {
459 int best_ndir = inodes_per_group;
460 int ret = -1;
461
462 if (qstr) {
463 hinfo.hash_version = DX_HASH_HALF_MD4;
464 hinfo.seed = sbi->s_hash_seed;
465 ext4fs_dirhash(parent, qstr->name, qstr->len, &hinfo);
466 parent_group = hinfo.hash % ngroups;
467 } else
468 parent_group = get_random_u32_below(ngroups);
469 for (i = 0; i < ngroups; i++) {
470 g = (parent_group + i) % ngroups;
471 get_orlov_stats(sb, g, flex_size, &stats);
472 if (!stats.free_inodes)
473 continue;
474 if (stats.used_dirs >= best_ndir)
475 continue;
476 if (stats.free_inodes < avefreei)
477 continue;
478 if (stats.free_clusters < avefreec)
479 continue;
480 grp = g;
481 ret = 0;
482 best_ndir = stats.used_dirs;
483 }
484 if (ret)
485 goto fallback;
486 found_flex_bg:
487 if (flex_size == 1) {
488 *group = grp;
489 return 0;
490 }
491
492 /*
493 * We pack inodes at the beginning of the flexgroup's
494 * inode tables. Block allocation decisions will do
495 * something similar, although regular files will
496 * start at 2nd block group of the flexgroup. See
497 * ext4_ext_find_goal() and ext4_find_near().
498 */
499 grp *= flex_size;
500 for (i = 0; i < flex_size; i++) {
501 if (grp+i >= real_ngroups)
502 break;
503 desc = ext4_get_group_desc(sb, grp+i, NULL);
504 if (desc && ext4_free_inodes_count(sb, desc)) {
505 *group = grp+i;
506 return 0;
507 }
508 }
509 goto fallback;
510 }
511
512 max_dirs = ndirs / ngroups + inodes_per_group*flex_size / 16;
513 min_inodes = avefreei - inodes_per_group*flex_size / 4;
514 if (min_inodes < 1)
515 min_inodes = 1;
516 min_clusters = avefreec - EXT4_CLUSTERS_PER_GROUP(sb)*flex_size / 4;
517
518 /*
519 * Start looking in the flex group where we last allocated an
520 * inode for this parent directory
521 */
522 if (EXT4_I(parent)->i_last_alloc_group != ~0) {
523 parent_group = EXT4_I(parent)->i_last_alloc_group;
524 if (flex_size > 1)
525 parent_group >>= sbi->s_log_groups_per_flex;
526 }
527
528 for (i = 0; i < ngroups; i++) {
529 grp = (parent_group + i) % ngroups;
530 get_orlov_stats(sb, grp, flex_size, &stats);
531 if (stats.used_dirs >= max_dirs)
532 continue;
533 if (stats.free_inodes < min_inodes)
534 continue;
535 if (stats.free_clusters < min_clusters)
536 continue;
537 goto found_flex_bg;
538 }
539
540fallback:
541 ngroups = real_ngroups;
542 avefreei = freei / ngroups;
543fallback_retry:
544 parent_group = EXT4_I(parent)->i_block_group;
545 for (i = 0; i < ngroups; i++) {
546 grp = (parent_group + i) % ngroups;
547 desc = ext4_get_group_desc(sb, grp, NULL);
548 if (desc) {
549 grp_free = ext4_free_inodes_count(sb, desc);
550 if (grp_free && grp_free >= avefreei) {
551 *group = grp;
552 return 0;
553 }
554 }
555 }
556
557 if (avefreei) {
558 /*
559 * The free-inodes counter is approximate, and for really small
560 * filesystems the above test can fail to find any blockgroups
561 */
562 avefreei = 0;
563 goto fallback_retry;
564 }
565
566 return -1;
567}
568
569static int find_group_other(struct super_block *sb, struct inode *parent,
570 ext4_group_t *group, umode_t mode)
571{
572 ext4_group_t parent_group = EXT4_I(parent)->i_block_group;
573 ext4_group_t i, last, ngroups = ext4_get_groups_count(sb);
574 struct ext4_group_desc *desc;
575 int flex_size = ext4_flex_bg_size(EXT4_SB(sb));
576
577 /*
578 * Try to place the inode is the same flex group as its
579 * parent. If we can't find space, use the Orlov algorithm to
580 * find another flex group, and store that information in the
581 * parent directory's inode information so that use that flex
582 * group for future allocations.
583 */
584 if (flex_size > 1) {
585 int retry = 0;
586
587 try_again:
588 parent_group &= ~(flex_size-1);
589 last = parent_group + flex_size;
590 if (last > ngroups)
591 last = ngroups;
592 for (i = parent_group; i < last; i++) {
593 desc = ext4_get_group_desc(sb, i, NULL);
594 if (desc && ext4_free_inodes_count(sb, desc)) {
595 *group = i;
596 return 0;
597 }
598 }
599 if (!retry && EXT4_I(parent)->i_last_alloc_group != ~0) {
600 retry = 1;
601 parent_group = EXT4_I(parent)->i_last_alloc_group;
602 goto try_again;
603 }
604 /*
605 * If this didn't work, use the Orlov search algorithm
606 * to find a new flex group; we pass in the mode to
607 * avoid the topdir algorithms.
608 */
609 *group = parent_group + flex_size;
610 if (*group > ngroups)
611 *group = 0;
612 return find_group_orlov(sb, parent, group, mode, NULL);
613 }
614
615 /*
616 * Try to place the inode in its parent directory
617 */
618 *group = parent_group;
619 desc = ext4_get_group_desc(sb, *group, NULL);
620 if (desc && ext4_free_inodes_count(sb, desc) &&
621 ext4_free_group_clusters(sb, desc))
622 return 0;
623
624 /*
625 * We're going to place this inode in a different blockgroup from its
626 * parent. We want to cause files in a common directory to all land in
627 * the same blockgroup. But we want files which are in a different
628 * directory which shares a blockgroup with our parent to land in a
629 * different blockgroup.
630 *
631 * So add our directory's i_ino into the starting point for the hash.
632 */
633 *group = (*group + parent->i_ino) % ngroups;
634
635 /*
636 * Use a quadratic hash to find a group with a free inode and some free
637 * blocks.
638 */
639 for (i = 1; i < ngroups; i <<= 1) {
640 *group += i;
641 if (*group >= ngroups)
642 *group -= ngroups;
643 desc = ext4_get_group_desc(sb, *group, NULL);
644 if (desc && ext4_free_inodes_count(sb, desc) &&
645 ext4_free_group_clusters(sb, desc))
646 return 0;
647 }
648
649 /*
650 * That failed: try linear search for a free inode, even if that group
651 * has no free blocks.
652 */
653 *group = parent_group;
654 for (i = 0; i < ngroups; i++) {
655 if (++*group >= ngroups)
656 *group = 0;
657 desc = ext4_get_group_desc(sb, *group, NULL);
658 if (desc && ext4_free_inodes_count(sb, desc))
659 return 0;
660 }
661
662 return -1;
663}
664
665/*
666 * In no journal mode, if an inode has recently been deleted, we want
667 * to avoid reusing it until we're reasonably sure the inode table
668 * block has been written back to disk. (Yes, these values are
669 * somewhat arbitrary...)
670 */
671#define RECENTCY_MIN 60
672#define RECENTCY_DIRTY 300
673
674static int recently_deleted(struct super_block *sb, ext4_group_t group, int ino)
675{
676 struct ext4_group_desc *gdp;
677 struct ext4_inode *raw_inode;
678 struct buffer_head *bh;
679 int inodes_per_block = EXT4_SB(sb)->s_inodes_per_block;
680 int offset, ret = 0;
681 int recentcy = RECENTCY_MIN;
682 u32 dtime, now;
683
684 gdp = ext4_get_group_desc(sb, group, NULL);
685 if (unlikely(!gdp))
686 return 0;
687
688 bh = sb_find_get_block(sb, ext4_inode_table(sb, gdp) +
689 (ino / inodes_per_block));
690 if (!bh || !buffer_uptodate(bh))
691 /*
692 * If the block is not in the buffer cache, then it
693 * must have been written out.
694 */
695 goto out;
696
697 offset = (ino % inodes_per_block) * EXT4_INODE_SIZE(sb);
698 raw_inode = (struct ext4_inode *) (bh->b_data + offset);
699
700 /* i_dtime is only 32 bits on disk, but we only care about relative
701 * times in the range of a few minutes (i.e. long enough to sync a
702 * recently-deleted inode to disk), so using the low 32 bits of the
703 * clock (a 68 year range) is enough, see time_before32() */
704 dtime = le32_to_cpu(raw_inode->i_dtime);
705 now = ktime_get_real_seconds();
706 if (buffer_dirty(bh))
707 recentcy += RECENTCY_DIRTY;
708
709 if (dtime && time_before32(dtime, now) &&
710 time_before32(now, dtime + recentcy))
711 ret = 1;
712out:
713 brelse(bh);
714 return ret;
715}
716
717static int find_inode_bit(struct super_block *sb, ext4_group_t group,
718 struct buffer_head *bitmap, unsigned long *ino)
719{
720 bool check_recently_deleted = EXT4_SB(sb)->s_journal == NULL;
721 unsigned long recently_deleted_ino = EXT4_INODES_PER_GROUP(sb);
722
723next:
724 *ino = ext4_find_next_zero_bit((unsigned long *)
725 bitmap->b_data,
726 EXT4_INODES_PER_GROUP(sb), *ino);
727 if (*ino >= EXT4_INODES_PER_GROUP(sb))
728 goto not_found;
729
730 if (check_recently_deleted && recently_deleted(sb, group, *ino)) {
731 recently_deleted_ino = *ino;
732 *ino = *ino + 1;
733 if (*ino < EXT4_INODES_PER_GROUP(sb))
734 goto next;
735 goto not_found;
736 }
737 return 1;
738not_found:
739 if (recently_deleted_ino >= EXT4_INODES_PER_GROUP(sb))
740 return 0;
741 /*
742 * Not reusing recently deleted inodes is mostly a preference. We don't
743 * want to report ENOSPC or skew allocation patterns because of that.
744 * So return even recently deleted inode if we could find better in the
745 * given range.
746 */
747 *ino = recently_deleted_ino;
748 return 1;
749}
750
751int ext4_mark_inode_used(struct super_block *sb, int ino)
752{
753 unsigned long max_ino = le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count);
754 struct buffer_head *inode_bitmap_bh = NULL, *group_desc_bh = NULL;
755 struct ext4_group_desc *gdp;
756 ext4_group_t group;
757 int bit;
758 int err = -EFSCORRUPTED;
759
760 if (ino < EXT4_FIRST_INO(sb) || ino > max_ino)
761 goto out;
762
763 group = (ino - 1) / EXT4_INODES_PER_GROUP(sb);
764 bit = (ino - 1) % EXT4_INODES_PER_GROUP(sb);
765 inode_bitmap_bh = ext4_read_inode_bitmap(sb, group);
766 if (IS_ERR(inode_bitmap_bh))
767 return PTR_ERR(inode_bitmap_bh);
768
769 if (ext4_test_bit(bit, inode_bitmap_bh->b_data)) {
770 err = 0;
771 goto out;
772 }
773
774 gdp = ext4_get_group_desc(sb, group, &group_desc_bh);
775 if (!gdp || !group_desc_bh) {
776 err = -EINVAL;
777 goto out;
778 }
779
780 ext4_set_bit(bit, inode_bitmap_bh->b_data);
781
782 BUFFER_TRACE(inode_bitmap_bh, "call ext4_handle_dirty_metadata");
783 err = ext4_handle_dirty_metadata(NULL, NULL, inode_bitmap_bh);
784 if (err) {
785 ext4_std_error(sb, err);
786 goto out;
787 }
788 err = sync_dirty_buffer(inode_bitmap_bh);
789 if (err) {
790 ext4_std_error(sb, err);
791 goto out;
792 }
793
794 /* We may have to initialize the block bitmap if it isn't already */
795 if (ext4_has_group_desc_csum(sb) &&
796 gdp->bg_flags & cpu_to_le16(EXT4_BG_BLOCK_UNINIT)) {
797 struct buffer_head *block_bitmap_bh;
798
799 block_bitmap_bh = ext4_read_block_bitmap(sb, group);
800 if (IS_ERR(block_bitmap_bh)) {
801 err = PTR_ERR(block_bitmap_bh);
802 goto out;
803 }
804
805 BUFFER_TRACE(block_bitmap_bh, "dirty block bitmap");
806 err = ext4_handle_dirty_metadata(NULL, NULL, block_bitmap_bh);
807 sync_dirty_buffer(block_bitmap_bh);
808
809 /* recheck and clear flag under lock if we still need to */
810 ext4_lock_group(sb, group);
811 if (ext4_has_group_desc_csum(sb) &&
812 (gdp->bg_flags & cpu_to_le16(EXT4_BG_BLOCK_UNINIT))) {
813 gdp->bg_flags &= cpu_to_le16(~EXT4_BG_BLOCK_UNINIT);
814 ext4_free_group_clusters_set(sb, gdp,
815 ext4_free_clusters_after_init(sb, group, gdp));
816 ext4_block_bitmap_csum_set(sb, group, gdp,
817 block_bitmap_bh);
818 ext4_group_desc_csum_set(sb, group, gdp);
819 }
820 ext4_unlock_group(sb, group);
821 brelse(block_bitmap_bh);
822
823 if (err) {
824 ext4_std_error(sb, err);
825 goto out;
826 }
827 }
828
829 /* Update the relevant bg descriptor fields */
830 if (ext4_has_group_desc_csum(sb)) {
831 int free;
832
833 ext4_lock_group(sb, group); /* while we modify the bg desc */
834 free = EXT4_INODES_PER_GROUP(sb) -
835 ext4_itable_unused_count(sb, gdp);
836 if (gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_UNINIT)) {
837 gdp->bg_flags &= cpu_to_le16(~EXT4_BG_INODE_UNINIT);
838 free = 0;
839 }
840
841 /*
842 * Check the relative inode number against the last used
843 * relative inode number in this group. if it is greater
844 * we need to update the bg_itable_unused count
845 */
846 if (bit >= free)
847 ext4_itable_unused_set(sb, gdp,
848 (EXT4_INODES_PER_GROUP(sb) - bit - 1));
849 } else {
850 ext4_lock_group(sb, group);
851 }
852
853 ext4_free_inodes_set(sb, gdp, ext4_free_inodes_count(sb, gdp) - 1);
854 if (ext4_has_group_desc_csum(sb)) {
855 ext4_inode_bitmap_csum_set(sb, group, gdp, inode_bitmap_bh,
856 EXT4_INODES_PER_GROUP(sb) / 8);
857 ext4_group_desc_csum_set(sb, group, gdp);
858 }
859
860 ext4_unlock_group(sb, group);
861 err = ext4_handle_dirty_metadata(NULL, NULL, group_desc_bh);
862 sync_dirty_buffer(group_desc_bh);
863out:
864 return err;
865}
866
867static int ext4_xattr_credits_for_new_inode(struct inode *dir, mode_t mode,
868 bool encrypt)
869{
870 struct super_block *sb = dir->i_sb;
871 int nblocks = 0;
872#ifdef CONFIG_EXT4_FS_POSIX_ACL
873 struct posix_acl *p = get_inode_acl(dir, ACL_TYPE_DEFAULT);
874
875 if (IS_ERR(p))
876 return PTR_ERR(p);
877 if (p) {
878 int acl_size = p->a_count * sizeof(ext4_acl_entry);
879
880 nblocks += (S_ISDIR(mode) ? 2 : 1) *
881 __ext4_xattr_set_credits(sb, NULL /* inode */,
882 NULL /* block_bh */, acl_size,
883 true /* is_create */);
884 posix_acl_release(p);
885 }
886#endif
887
888#ifdef CONFIG_SECURITY
889 {
890 int num_security_xattrs = 1;
891
892#ifdef CONFIG_INTEGRITY
893 num_security_xattrs++;
894#endif
895 /*
896 * We assume that security xattrs are never more than 1k.
897 * In practice they are under 128 bytes.
898 */
899 nblocks += num_security_xattrs *
900 __ext4_xattr_set_credits(sb, NULL /* inode */,
901 NULL /* block_bh */, 1024,
902 true /* is_create */);
903 }
904#endif
905 if (encrypt)
906 nblocks += __ext4_xattr_set_credits(sb,
907 NULL /* inode */,
908 NULL /* block_bh */,
909 FSCRYPT_SET_CONTEXT_MAX_SIZE,
910 true /* is_create */);
911 return nblocks;
912}
913
914/*
915 * There are two policies for allocating an inode. If the new inode is
916 * a directory, then a forward search is made for a block group with both
917 * free space and a low directory-to-inode ratio; if that fails, then of
918 * the groups with above-average free space, that group with the fewest
919 * directories already is chosen.
920 *
921 * For other inodes, search forward from the parent directory's block
922 * group to find a free inode.
923 */
924struct inode *__ext4_new_inode(struct user_namespace *mnt_userns,
925 handle_t *handle, struct inode *dir,
926 umode_t mode, const struct qstr *qstr,
927 __u32 goal, uid_t *owner, __u32 i_flags,
928 int handle_type, unsigned int line_no,
929 int nblocks)
930{
931 struct super_block *sb;
932 struct buffer_head *inode_bitmap_bh = NULL;
933 struct buffer_head *group_desc_bh;
934 ext4_group_t ngroups, group = 0;
935 unsigned long ino = 0;
936 struct inode *inode;
937 struct ext4_group_desc *gdp = NULL;
938 struct ext4_inode_info *ei;
939 struct ext4_sb_info *sbi;
940 int ret2, err;
941 struct inode *ret;
942 ext4_group_t i;
943 ext4_group_t flex_group;
944 struct ext4_group_info *grp = NULL;
945 bool encrypt = false;
946
947 /* Cannot create files in a deleted directory */
948 if (!dir || !dir->i_nlink)
949 return ERR_PTR(-EPERM);
950
951 sb = dir->i_sb;
952 sbi = EXT4_SB(sb);
953
954 if (unlikely(ext4_forced_shutdown(sbi)))
955 return ERR_PTR(-EIO);
956
957 ngroups = ext4_get_groups_count(sb);
958 trace_ext4_request_inode(dir, mode);
959 inode = new_inode(sb);
960 if (!inode)
961 return ERR_PTR(-ENOMEM);
962 ei = EXT4_I(inode);
963
964 /*
965 * Initialize owners and quota early so that we don't have to account
966 * for quota initialization worst case in standard inode creating
967 * transaction
968 */
969 if (owner) {
970 inode->i_mode = mode;
971 i_uid_write(inode, owner[0]);
972 i_gid_write(inode, owner[1]);
973 } else if (test_opt(sb, GRPID)) {
974 inode->i_mode = mode;
975 inode_fsuid_set(inode, mnt_userns);
976 inode->i_gid = dir->i_gid;
977 } else
978 inode_init_owner(mnt_userns, inode, dir, mode);
979
980 if (ext4_has_feature_project(sb) &&
981 ext4_test_inode_flag(dir, EXT4_INODE_PROJINHERIT))
982 ei->i_projid = EXT4_I(dir)->i_projid;
983 else
984 ei->i_projid = make_kprojid(&init_user_ns, EXT4_DEF_PROJID);
985
986 if (!(i_flags & EXT4_EA_INODE_FL)) {
987 err = fscrypt_prepare_new_inode(dir, inode, &encrypt);
988 if (err)
989 goto out;
990 }
991
992 err = dquot_initialize(inode);
993 if (err)
994 goto out;
995
996 if (!handle && sbi->s_journal && !(i_flags & EXT4_EA_INODE_FL)) {
997 ret2 = ext4_xattr_credits_for_new_inode(dir, mode, encrypt);
998 if (ret2 < 0) {
999 err = ret2;
1000 goto out;
1001 }
1002 nblocks += ret2;
1003 }
1004
1005 if (!goal)
1006 goal = sbi->s_inode_goal;
1007
1008 if (goal && goal <= le32_to_cpu(sbi->s_es->s_inodes_count)) {
1009 group = (goal - 1) / EXT4_INODES_PER_GROUP(sb);
1010 ino = (goal - 1) % EXT4_INODES_PER_GROUP(sb);
1011 ret2 = 0;
1012 goto got_group;
1013 }
1014
1015 if (S_ISDIR(mode))
1016 ret2 = find_group_orlov(sb, dir, &group, mode, qstr);
1017 else
1018 ret2 = find_group_other(sb, dir, &group, mode);
1019
1020got_group:
1021 EXT4_I(dir)->i_last_alloc_group = group;
1022 err = -ENOSPC;
1023 if (ret2 == -1)
1024 goto out;
1025
1026 /*
1027 * Normally we will only go through one pass of this loop,
1028 * unless we get unlucky and it turns out the group we selected
1029 * had its last inode grabbed by someone else.
1030 */
1031 for (i = 0; i < ngroups; i++, ino = 0) {
1032 err = -EIO;
1033
1034 gdp = ext4_get_group_desc(sb, group, &group_desc_bh);
1035 if (!gdp)
1036 goto out;
1037
1038 /*
1039 * Check free inodes count before loading bitmap.
1040 */
1041 if (ext4_free_inodes_count(sb, gdp) == 0)
1042 goto next_group;
1043
1044 if (!(sbi->s_mount_state & EXT4_FC_REPLAY)) {
1045 grp = ext4_get_group_info(sb, group);
1046 /*
1047 * Skip groups with already-known suspicious inode
1048 * tables
1049 */
1050 if (EXT4_MB_GRP_IBITMAP_CORRUPT(grp))
1051 goto next_group;
1052 }
1053
1054 brelse(inode_bitmap_bh);
1055 inode_bitmap_bh = ext4_read_inode_bitmap(sb, group);
1056 /* Skip groups with suspicious inode tables */
1057 if (((!(sbi->s_mount_state & EXT4_FC_REPLAY))
1058 && EXT4_MB_GRP_IBITMAP_CORRUPT(grp)) ||
1059 IS_ERR(inode_bitmap_bh)) {
1060 inode_bitmap_bh = NULL;
1061 goto next_group;
1062 }
1063
1064repeat_in_this_group:
1065 ret2 = find_inode_bit(sb, group, inode_bitmap_bh, &ino);
1066 if (!ret2)
1067 goto next_group;
1068
1069 if (group == 0 && (ino + 1) < EXT4_FIRST_INO(sb)) {
1070 ext4_error(sb, "reserved inode found cleared - "
1071 "inode=%lu", ino + 1);
1072 ext4_mark_group_bitmap_corrupted(sb, group,
1073 EXT4_GROUP_INFO_IBITMAP_CORRUPT);
1074 goto next_group;
1075 }
1076
1077 if ((!(sbi->s_mount_state & EXT4_FC_REPLAY)) && !handle) {
1078 BUG_ON(nblocks <= 0);
1079 handle = __ext4_journal_start_sb(NULL, dir->i_sb,
1080 line_no, handle_type, nblocks, 0,
1081 ext4_trans_default_revoke_credits(sb));
1082 if (IS_ERR(handle)) {
1083 err = PTR_ERR(handle);
1084 ext4_std_error(sb, err);
1085 goto out;
1086 }
1087 }
1088 BUFFER_TRACE(inode_bitmap_bh, "get_write_access");
1089 err = ext4_journal_get_write_access(handle, sb, inode_bitmap_bh,
1090 EXT4_JTR_NONE);
1091 if (err) {
1092 ext4_std_error(sb, err);
1093 goto out;
1094 }
1095 ext4_lock_group(sb, group);
1096 ret2 = ext4_test_and_set_bit(ino, inode_bitmap_bh->b_data);
1097 if (ret2) {
1098 /* Someone already took the bit. Repeat the search
1099 * with lock held.
1100 */
1101 ret2 = find_inode_bit(sb, group, inode_bitmap_bh, &ino);
1102 if (ret2) {
1103 ext4_set_bit(ino, inode_bitmap_bh->b_data);
1104 ret2 = 0;
1105 } else {
1106 ret2 = 1; /* we didn't grab the inode */
1107 }
1108 }
1109 ext4_unlock_group(sb, group);
1110 ino++; /* the inode bitmap is zero-based */
1111 if (!ret2)
1112 goto got; /* we grabbed the inode! */
1113
1114 if (ino < EXT4_INODES_PER_GROUP(sb))
1115 goto repeat_in_this_group;
1116next_group:
1117 if (++group == ngroups)
1118 group = 0;
1119 }
1120 err = -ENOSPC;
1121 goto out;
1122
1123got:
1124 BUFFER_TRACE(inode_bitmap_bh, "call ext4_handle_dirty_metadata");
1125 err = ext4_handle_dirty_metadata(handle, NULL, inode_bitmap_bh);
1126 if (err) {
1127 ext4_std_error(sb, err);
1128 goto out;
1129 }
1130
1131 BUFFER_TRACE(group_desc_bh, "get_write_access");
1132 err = ext4_journal_get_write_access(handle, sb, group_desc_bh,
1133 EXT4_JTR_NONE);
1134 if (err) {
1135 ext4_std_error(sb, err);
1136 goto out;
1137 }
1138
1139 /* We may have to initialize the block bitmap if it isn't already */
1140 if (ext4_has_group_desc_csum(sb) &&
1141 gdp->bg_flags & cpu_to_le16(EXT4_BG_BLOCK_UNINIT)) {
1142 struct buffer_head *block_bitmap_bh;
1143
1144 block_bitmap_bh = ext4_read_block_bitmap(sb, group);
1145 if (IS_ERR(block_bitmap_bh)) {
1146 err = PTR_ERR(block_bitmap_bh);
1147 goto out;
1148 }
1149 BUFFER_TRACE(block_bitmap_bh, "get block bitmap access");
1150 err = ext4_journal_get_write_access(handle, sb, block_bitmap_bh,
1151 EXT4_JTR_NONE);
1152 if (err) {
1153 brelse(block_bitmap_bh);
1154 ext4_std_error(sb, err);
1155 goto out;
1156 }
1157
1158 BUFFER_TRACE(block_bitmap_bh, "dirty block bitmap");
1159 err = ext4_handle_dirty_metadata(handle, NULL, block_bitmap_bh);
1160
1161 /* recheck and clear flag under lock if we still need to */
1162 ext4_lock_group(sb, group);
1163 if (ext4_has_group_desc_csum(sb) &&
1164 (gdp->bg_flags & cpu_to_le16(EXT4_BG_BLOCK_UNINIT))) {
1165 gdp->bg_flags &= cpu_to_le16(~EXT4_BG_BLOCK_UNINIT);
1166 ext4_free_group_clusters_set(sb, gdp,
1167 ext4_free_clusters_after_init(sb, group, gdp));
1168 ext4_block_bitmap_csum_set(sb, group, gdp,
1169 block_bitmap_bh);
1170 ext4_group_desc_csum_set(sb, group, gdp);
1171 }
1172 ext4_unlock_group(sb, group);
1173 brelse(block_bitmap_bh);
1174
1175 if (err) {
1176 ext4_std_error(sb, err);
1177 goto out;
1178 }
1179 }
1180
1181 /* Update the relevant bg descriptor fields */
1182 if (ext4_has_group_desc_csum(sb)) {
1183 int free;
1184 struct ext4_group_info *grp = NULL;
1185
1186 if (!(sbi->s_mount_state & EXT4_FC_REPLAY)) {
1187 grp = ext4_get_group_info(sb, group);
1188 down_read(&grp->alloc_sem); /*
1189 * protect vs itable
1190 * lazyinit
1191 */
1192 }
1193 ext4_lock_group(sb, group); /* while we modify the bg desc */
1194 free = EXT4_INODES_PER_GROUP(sb) -
1195 ext4_itable_unused_count(sb, gdp);
1196 if (gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_UNINIT)) {
1197 gdp->bg_flags &= cpu_to_le16(~EXT4_BG_INODE_UNINIT);
1198 free = 0;
1199 }
1200 /*
1201 * Check the relative inode number against the last used
1202 * relative inode number in this group. if it is greater
1203 * we need to update the bg_itable_unused count
1204 */
1205 if (ino > free)
1206 ext4_itable_unused_set(sb, gdp,
1207 (EXT4_INODES_PER_GROUP(sb) - ino));
1208 if (!(sbi->s_mount_state & EXT4_FC_REPLAY))
1209 up_read(&grp->alloc_sem);
1210 } else {
1211 ext4_lock_group(sb, group);
1212 }
1213
1214 ext4_free_inodes_set(sb, gdp, ext4_free_inodes_count(sb, gdp) - 1);
1215 if (S_ISDIR(mode)) {
1216 ext4_used_dirs_set(sb, gdp, ext4_used_dirs_count(sb, gdp) + 1);
1217 if (sbi->s_log_groups_per_flex) {
1218 ext4_group_t f = ext4_flex_group(sbi, group);
1219
1220 atomic_inc(&sbi_array_rcu_deref(sbi, s_flex_groups,
1221 f)->used_dirs);
1222 }
1223 }
1224 if (ext4_has_group_desc_csum(sb)) {
1225 ext4_inode_bitmap_csum_set(sb, group, gdp, inode_bitmap_bh,
1226 EXT4_INODES_PER_GROUP(sb) / 8);
1227 ext4_group_desc_csum_set(sb, group, gdp);
1228 }
1229 ext4_unlock_group(sb, group);
1230
1231 BUFFER_TRACE(group_desc_bh, "call ext4_handle_dirty_metadata");
1232 err = ext4_handle_dirty_metadata(handle, NULL, group_desc_bh);
1233 if (err) {
1234 ext4_std_error(sb, err);
1235 goto out;
1236 }
1237
1238 percpu_counter_dec(&sbi->s_freeinodes_counter);
1239 if (S_ISDIR(mode))
1240 percpu_counter_inc(&sbi->s_dirs_counter);
1241
1242 if (sbi->s_log_groups_per_flex) {
1243 flex_group = ext4_flex_group(sbi, group);
1244 atomic_dec(&sbi_array_rcu_deref(sbi, s_flex_groups,
1245 flex_group)->free_inodes);
1246 }
1247
1248 inode->i_ino = ino + group * EXT4_INODES_PER_GROUP(sb);
1249 /* This is the optimal IO size (for stat), not the fs block size */
1250 inode->i_blocks = 0;
1251 inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(inode);
1252 ei->i_crtime = inode->i_mtime;
1253
1254 memset(ei->i_data, 0, sizeof(ei->i_data));
1255 ei->i_dir_start_lookup = 0;
1256 ei->i_disksize = 0;
1257
1258 /* Don't inherit extent flag from directory, amongst others. */
1259 ei->i_flags =
1260 ext4_mask_flags(mode, EXT4_I(dir)->i_flags & EXT4_FL_INHERITED);
1261 ei->i_flags |= i_flags;
1262 ei->i_file_acl = 0;
1263 ei->i_dtime = 0;
1264 ei->i_block_group = group;
1265 ei->i_last_alloc_group = ~0;
1266
1267 ext4_set_inode_flags(inode, true);
1268 if (IS_DIRSYNC(inode))
1269 ext4_handle_sync(handle);
1270 if (insert_inode_locked(inode) < 0) {
1271 /*
1272 * Likely a bitmap corruption causing inode to be allocated
1273 * twice.
1274 */
1275 err = -EIO;
1276 ext4_error(sb, "failed to insert inode %lu: doubly allocated?",
1277 inode->i_ino);
1278 ext4_mark_group_bitmap_corrupted(sb, group,
1279 EXT4_GROUP_INFO_IBITMAP_CORRUPT);
1280 goto out;
1281 }
1282 inode->i_generation = get_random_u32();
1283
1284 /* Precompute checksum seed for inode metadata */
1285 if (ext4_has_metadata_csum(sb)) {
1286 __u32 csum;
1287 __le32 inum = cpu_to_le32(inode->i_ino);
1288 __le32 gen = cpu_to_le32(inode->i_generation);
1289 csum = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&inum,
1290 sizeof(inum));
1291 ei->i_csum_seed = ext4_chksum(sbi, csum, (__u8 *)&gen,
1292 sizeof(gen));
1293 }
1294
1295 ext4_clear_state_flags(ei); /* Only relevant on 32-bit archs */
1296 ext4_set_inode_state(inode, EXT4_STATE_NEW);
1297
1298 ei->i_extra_isize = sbi->s_want_extra_isize;
1299 ei->i_inline_off = 0;
1300 if (ext4_has_feature_inline_data(sb) &&
1301 (!(ei->i_flags & EXT4_DAX_FL) || S_ISDIR(mode)))
1302 ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
1303 ret = inode;
1304 err = dquot_alloc_inode(inode);
1305 if (err)
1306 goto fail_drop;
1307
1308 /*
1309 * Since the encryption xattr will always be unique, create it first so
1310 * that it's less likely to end up in an external xattr block and
1311 * prevent its deduplication.
1312 */
1313 if (encrypt) {
1314 err = fscrypt_set_context(inode, handle);
1315 if (err)
1316 goto fail_free_drop;
1317 }
1318
1319 if (!(ei->i_flags & EXT4_EA_INODE_FL)) {
1320 err = ext4_init_acl(handle, inode, dir);
1321 if (err)
1322 goto fail_free_drop;
1323
1324 err = ext4_init_security(handle, inode, dir, qstr);
1325 if (err)
1326 goto fail_free_drop;
1327 }
1328
1329 if (ext4_has_feature_extents(sb)) {
1330 /* set extent flag only for directory, file and normal symlink*/
1331 if (S_ISDIR(mode) || S_ISREG(mode) || S_ISLNK(mode)) {
1332 ext4_set_inode_flag(inode, EXT4_INODE_EXTENTS);
1333 ext4_ext_tree_init(handle, inode);
1334 }
1335 }
1336
1337 if (ext4_handle_valid(handle)) {
1338 ei->i_sync_tid = handle->h_transaction->t_tid;
1339 ei->i_datasync_tid = handle->h_transaction->t_tid;
1340 }
1341
1342 err = ext4_mark_inode_dirty(handle, inode);
1343 if (err) {
1344 ext4_std_error(sb, err);
1345 goto fail_free_drop;
1346 }
1347
1348 ext4_debug("allocating inode %lu\n", inode->i_ino);
1349 trace_ext4_allocate_inode(inode, dir, mode);
1350 brelse(inode_bitmap_bh);
1351 return ret;
1352
1353fail_free_drop:
1354 dquot_free_inode(inode);
1355fail_drop:
1356 clear_nlink(inode);
1357 unlock_new_inode(inode);
1358out:
1359 dquot_drop(inode);
1360 inode->i_flags |= S_NOQUOTA;
1361 iput(inode);
1362 brelse(inode_bitmap_bh);
1363 return ERR_PTR(err);
1364}
1365
1366/* Verify that we are loading a valid orphan from disk */
1367struct inode *ext4_orphan_get(struct super_block *sb, unsigned long ino)
1368{
1369 unsigned long max_ino = le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count);
1370 ext4_group_t block_group;
1371 int bit;
1372 struct buffer_head *bitmap_bh = NULL;
1373 struct inode *inode = NULL;
1374 int err = -EFSCORRUPTED;
1375
1376 if (ino < EXT4_FIRST_INO(sb) || ino > max_ino)
1377 goto bad_orphan;
1378
1379 block_group = (ino - 1) / EXT4_INODES_PER_GROUP(sb);
1380 bit = (ino - 1) % EXT4_INODES_PER_GROUP(sb);
1381 bitmap_bh = ext4_read_inode_bitmap(sb, block_group);
1382 if (IS_ERR(bitmap_bh))
1383 return ERR_CAST(bitmap_bh);
1384
1385 /* Having the inode bit set should be a 100% indicator that this
1386 * is a valid orphan (no e2fsck run on fs). Orphans also include
1387 * inodes that were being truncated, so we can't check i_nlink==0.
1388 */
1389 if (!ext4_test_bit(bit, bitmap_bh->b_data))
1390 goto bad_orphan;
1391
1392 inode = ext4_iget(sb, ino, EXT4_IGET_NORMAL);
1393 if (IS_ERR(inode)) {
1394 err = PTR_ERR(inode);
1395 ext4_error_err(sb, -err,
1396 "couldn't read orphan inode %lu (err %d)",
1397 ino, err);
1398 brelse(bitmap_bh);
1399 return inode;
1400 }
1401
1402 /*
1403 * If the orphans has i_nlinks > 0 then it should be able to
1404 * be truncated, otherwise it won't be removed from the orphan
1405 * list during processing and an infinite loop will result.
1406 * Similarly, it must not be a bad inode.
1407 */
1408 if ((inode->i_nlink && !ext4_can_truncate(inode)) ||
1409 is_bad_inode(inode))
1410 goto bad_orphan;
1411
1412 if (NEXT_ORPHAN(inode) > max_ino)
1413 goto bad_orphan;
1414 brelse(bitmap_bh);
1415 return inode;
1416
1417bad_orphan:
1418 ext4_error(sb, "bad orphan inode %lu", ino);
1419 if (bitmap_bh)
1420 printk(KERN_ERR "ext4_test_bit(bit=%d, block=%llu) = %d\n",
1421 bit, (unsigned long long)bitmap_bh->b_blocknr,
1422 ext4_test_bit(bit, bitmap_bh->b_data));
1423 if (inode) {
1424 printk(KERN_ERR "is_bad_inode(inode)=%d\n",
1425 is_bad_inode(inode));
1426 printk(KERN_ERR "NEXT_ORPHAN(inode)=%u\n",
1427 NEXT_ORPHAN(inode));
1428 printk(KERN_ERR "max_ino=%lu\n", max_ino);
1429 printk(KERN_ERR "i_nlink=%u\n", inode->i_nlink);
1430 /* Avoid freeing blocks if we got a bad deleted inode */
1431 if (inode->i_nlink == 0)
1432 inode->i_blocks = 0;
1433 iput(inode);
1434 }
1435 brelse(bitmap_bh);
1436 return ERR_PTR(err);
1437}
1438
1439unsigned long ext4_count_free_inodes(struct super_block *sb)
1440{
1441 unsigned long desc_count;
1442 struct ext4_group_desc *gdp;
1443 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
1444#ifdef EXT4FS_DEBUG
1445 struct ext4_super_block *es;
1446 unsigned long bitmap_count, x;
1447 struct buffer_head *bitmap_bh = NULL;
1448
1449 es = EXT4_SB(sb)->s_es;
1450 desc_count = 0;
1451 bitmap_count = 0;
1452 gdp = NULL;
1453 for (i = 0; i < ngroups; i++) {
1454 gdp = ext4_get_group_desc(sb, i, NULL);
1455 if (!gdp)
1456 continue;
1457 desc_count += ext4_free_inodes_count(sb, gdp);
1458 brelse(bitmap_bh);
1459 bitmap_bh = ext4_read_inode_bitmap(sb, i);
1460 if (IS_ERR(bitmap_bh)) {
1461 bitmap_bh = NULL;
1462 continue;
1463 }
1464
1465 x = ext4_count_free(bitmap_bh->b_data,
1466 EXT4_INODES_PER_GROUP(sb) / 8);
1467 printk(KERN_DEBUG "group %lu: stored = %d, counted = %lu\n",
1468 (unsigned long) i, ext4_free_inodes_count(sb, gdp), x);
1469 bitmap_count += x;
1470 }
1471 brelse(bitmap_bh);
1472 printk(KERN_DEBUG "ext4_count_free_inodes: "
1473 "stored = %u, computed = %lu, %lu\n",
1474 le32_to_cpu(es->s_free_inodes_count), desc_count, bitmap_count);
1475 return desc_count;
1476#else
1477 desc_count = 0;
1478 for (i = 0; i < ngroups; i++) {
1479 gdp = ext4_get_group_desc(sb, i, NULL);
1480 if (!gdp)
1481 continue;
1482 desc_count += ext4_free_inodes_count(sb, gdp);
1483 cond_resched();
1484 }
1485 return desc_count;
1486#endif
1487}
1488
1489/* Called at mount-time, super-block is locked */
1490unsigned long ext4_count_dirs(struct super_block * sb)
1491{
1492 unsigned long count = 0;
1493 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
1494
1495 for (i = 0; i < ngroups; i++) {
1496 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);
1497 if (!gdp)
1498 continue;
1499 count += ext4_used_dirs_count(sb, gdp);
1500 }
1501 return count;
1502}
1503
1504/*
1505 * Zeroes not yet zeroed inode table - just write zeroes through the whole
1506 * inode table. Must be called without any spinlock held. The only place
1507 * where it is called from on active part of filesystem is ext4lazyinit
1508 * thread, so we do not need any special locks, however we have to prevent
1509 * inode allocation from the current group, so we take alloc_sem lock, to
1510 * block ext4_new_inode() until we are finished.
1511 */
1512int ext4_init_inode_table(struct super_block *sb, ext4_group_t group,
1513 int barrier)
1514{
1515 struct ext4_group_info *grp = ext4_get_group_info(sb, group);
1516 struct ext4_sb_info *sbi = EXT4_SB(sb);
1517 struct ext4_group_desc *gdp = NULL;
1518 struct buffer_head *group_desc_bh;
1519 handle_t *handle;
1520 ext4_fsblk_t blk;
1521 int num, ret = 0, used_blks = 0;
1522 unsigned long used_inos = 0;
1523
1524 /* This should not happen, but just to be sure check this */
1525 if (sb_rdonly(sb)) {
1526 ret = 1;
1527 goto out;
1528 }
1529
1530 gdp = ext4_get_group_desc(sb, group, &group_desc_bh);
1531 if (!gdp)
1532 goto out;
1533
1534 /*
1535 * We do not need to lock this, because we are the only one
1536 * handling this flag.
1537 */
1538 if (gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED))
1539 goto out;
1540
1541 handle = ext4_journal_start_sb(sb, EXT4_HT_MISC, 1);
1542 if (IS_ERR(handle)) {
1543 ret = PTR_ERR(handle);
1544 goto out;
1545 }
1546
1547 down_write(&grp->alloc_sem);
1548 /*
1549 * If inode bitmap was already initialized there may be some
1550 * used inodes so we need to skip blocks with used inodes in
1551 * inode table.
1552 */
1553 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_UNINIT))) {
1554 used_inos = EXT4_INODES_PER_GROUP(sb) -
1555 ext4_itable_unused_count(sb, gdp);
1556 used_blks = DIV_ROUND_UP(used_inos, sbi->s_inodes_per_block);
1557
1558 /* Bogus inode unused count? */
1559 if (used_blks < 0 || used_blks > sbi->s_itb_per_group) {
1560 ext4_error(sb, "Something is wrong with group %u: "
1561 "used itable blocks: %d; "
1562 "itable unused count: %u",
1563 group, used_blks,
1564 ext4_itable_unused_count(sb, gdp));
1565 ret = 1;
1566 goto err_out;
1567 }
1568
1569 used_inos += group * EXT4_INODES_PER_GROUP(sb);
1570 /*
1571 * Are there some uninitialized inodes in the inode table
1572 * before the first normal inode?
1573 */
1574 if ((used_blks != sbi->s_itb_per_group) &&
1575 (used_inos < EXT4_FIRST_INO(sb))) {
1576 ext4_error(sb, "Something is wrong with group %u: "
1577 "itable unused count: %u; "
1578 "itables initialized count: %ld",
1579 group, ext4_itable_unused_count(sb, gdp),
1580 used_inos);
1581 ret = 1;
1582 goto err_out;
1583 }
1584 }
1585
1586 blk = ext4_inode_table(sb, gdp) + used_blks;
1587 num = sbi->s_itb_per_group - used_blks;
1588
1589 BUFFER_TRACE(group_desc_bh, "get_write_access");
1590 ret = ext4_journal_get_write_access(handle, sb, group_desc_bh,
1591 EXT4_JTR_NONE);
1592 if (ret)
1593 goto err_out;
1594
1595 /*
1596 * Skip zeroout if the inode table is full. But we set the ZEROED
1597 * flag anyway, because obviously, when it is full it does not need
1598 * further zeroing.
1599 */
1600 if (unlikely(num == 0))
1601 goto skip_zeroout;
1602
1603 ext4_debug("going to zero out inode table in group %d\n",
1604 group);
1605 ret = sb_issue_zeroout(sb, blk, num, GFP_NOFS);
1606 if (ret < 0)
1607 goto err_out;
1608 if (barrier)
1609 blkdev_issue_flush(sb->s_bdev);
1610
1611skip_zeroout:
1612 ext4_lock_group(sb, group);
1613 gdp->bg_flags |= cpu_to_le16(EXT4_BG_INODE_ZEROED);
1614 ext4_group_desc_csum_set(sb, group, gdp);
1615 ext4_unlock_group(sb, group);
1616
1617 BUFFER_TRACE(group_desc_bh,
1618 "call ext4_handle_dirty_metadata");
1619 ret = ext4_handle_dirty_metadata(handle, NULL,
1620 group_desc_bh);
1621
1622err_out:
1623 up_write(&grp->alloc_sem);
1624 ext4_journal_stop(handle);
1625out:
1626 return ret;
1627}
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * linux/fs/ext4/ialloc.c
4 *
5 * Copyright (C) 1992, 1993, 1994, 1995
6 * Remy Card (card@masi.ibp.fr)
7 * Laboratoire MASI - Institut Blaise Pascal
8 * Universite Pierre et Marie Curie (Paris VI)
9 *
10 * BSD ufs-inspired inode and directory allocation by
11 * Stephen Tweedie (sct@redhat.com), 1993
12 * Big-endian to little-endian byte-swapping/bitmaps by
13 * David S. Miller (davem@caip.rutgers.edu), 1995
14 */
15
16#include <linux/time.h>
17#include <linux/fs.h>
18#include <linux/stat.h>
19#include <linux/string.h>
20#include <linux/quotaops.h>
21#include <linux/buffer_head.h>
22#include <linux/random.h>
23#include <linux/bitops.h>
24#include <linux/blkdev.h>
25#include <linux/cred.h>
26
27#include <asm/byteorder.h>
28
29#include "ext4.h"
30#include "ext4_jbd2.h"
31#include "xattr.h"
32#include "acl.h"
33
34#include <trace/events/ext4.h>
35
36/*
37 * ialloc.c contains the inodes allocation and deallocation routines
38 */
39
40/*
41 * The free inodes are managed by bitmaps. A file system contains several
42 * blocks groups. Each group contains 1 bitmap block for blocks, 1 bitmap
43 * block for inodes, N blocks for the inode table and data blocks.
44 *
45 * The file system contains group descriptors which are located after the
46 * super block. Each descriptor contains the number of the bitmap block and
47 * the free blocks count in the block.
48 */
49
50/*
51 * To avoid calling the atomic setbit hundreds or thousands of times, we only
52 * need to use it within a single byte (to ensure we get endianness right).
53 * We can use memset for the rest of the bitmap as there are no other users.
54 */
55void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap)
56{
57 int i;
58
59 if (start_bit >= end_bit)
60 return;
61
62 ext4_debug("mark end bits +%d through +%d used\n", start_bit, end_bit);
63 for (i = start_bit; i < ((start_bit + 7) & ~7UL); i++)
64 ext4_set_bit(i, bitmap);
65 if (i < end_bit)
66 memset(bitmap + (i >> 3), 0xff, (end_bit - i) >> 3);
67}
68
69void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate)
70{
71 if (uptodate) {
72 set_buffer_uptodate(bh);
73 set_bitmap_uptodate(bh);
74 }
75 unlock_buffer(bh);
76 put_bh(bh);
77}
78
79static int ext4_validate_inode_bitmap(struct super_block *sb,
80 struct ext4_group_desc *desc,
81 ext4_group_t block_group,
82 struct buffer_head *bh)
83{
84 ext4_fsblk_t blk;
85 struct ext4_group_info *grp;
86
87 if (EXT4_SB(sb)->s_mount_state & EXT4_FC_REPLAY)
88 return 0;
89
90 if (buffer_verified(bh))
91 return 0;
92
93 grp = ext4_get_group_info(sb, block_group);
94 if (!grp || EXT4_MB_GRP_IBITMAP_CORRUPT(grp))
95 return -EFSCORRUPTED;
96
97 ext4_lock_group(sb, block_group);
98 if (buffer_verified(bh))
99 goto verified;
100 blk = ext4_inode_bitmap(sb, desc);
101 if (!ext4_inode_bitmap_csum_verify(sb, desc, bh) ||
102 ext4_simulate_fail(sb, EXT4_SIM_IBITMAP_CRC)) {
103 ext4_unlock_group(sb, block_group);
104 ext4_error(sb, "Corrupt inode bitmap - block_group = %u, "
105 "inode_bitmap = %llu", block_group, blk);
106 ext4_mark_group_bitmap_corrupted(sb, block_group,
107 EXT4_GROUP_INFO_IBITMAP_CORRUPT);
108 return -EFSBADCRC;
109 }
110 set_buffer_verified(bh);
111verified:
112 ext4_unlock_group(sb, block_group);
113 return 0;
114}
115
116/*
117 * Read the inode allocation bitmap for a given block_group, reading
118 * into the specified slot in the superblock's bitmap cache.
119 *
120 * Return buffer_head of bitmap on success, or an ERR_PTR on error.
121 */
122static struct buffer_head *
123ext4_read_inode_bitmap(struct super_block *sb, ext4_group_t block_group)
124{
125 struct ext4_group_desc *desc;
126 struct ext4_sb_info *sbi = EXT4_SB(sb);
127 struct buffer_head *bh = NULL;
128 ext4_fsblk_t bitmap_blk;
129 int err;
130
131 desc = ext4_get_group_desc(sb, block_group, NULL);
132 if (!desc)
133 return ERR_PTR(-EFSCORRUPTED);
134
135 bitmap_blk = ext4_inode_bitmap(sb, desc);
136 if ((bitmap_blk <= le32_to_cpu(sbi->s_es->s_first_data_block)) ||
137 (bitmap_blk >= ext4_blocks_count(sbi->s_es))) {
138 ext4_error(sb, "Invalid inode bitmap blk %llu in "
139 "block_group %u", bitmap_blk, block_group);
140 ext4_mark_group_bitmap_corrupted(sb, block_group,
141 EXT4_GROUP_INFO_IBITMAP_CORRUPT);
142 return ERR_PTR(-EFSCORRUPTED);
143 }
144 bh = sb_getblk(sb, bitmap_blk);
145 if (unlikely(!bh)) {
146 ext4_warning(sb, "Cannot read inode bitmap - "
147 "block_group = %u, inode_bitmap = %llu",
148 block_group, bitmap_blk);
149 return ERR_PTR(-ENOMEM);
150 }
151 if (bitmap_uptodate(bh))
152 goto verify;
153
154 lock_buffer(bh);
155 if (bitmap_uptodate(bh)) {
156 unlock_buffer(bh);
157 goto verify;
158 }
159
160 ext4_lock_group(sb, block_group);
161 if (ext4_has_group_desc_csum(sb) &&
162 (desc->bg_flags & cpu_to_le16(EXT4_BG_INODE_UNINIT))) {
163 if (block_group == 0) {
164 ext4_unlock_group(sb, block_group);
165 unlock_buffer(bh);
166 ext4_error(sb, "Inode bitmap for bg 0 marked "
167 "uninitialized");
168 err = -EFSCORRUPTED;
169 goto out;
170 }
171 memset(bh->b_data, 0, (EXT4_INODES_PER_GROUP(sb) + 7) / 8);
172 ext4_mark_bitmap_end(EXT4_INODES_PER_GROUP(sb),
173 sb->s_blocksize * 8, bh->b_data);
174 set_bitmap_uptodate(bh);
175 set_buffer_uptodate(bh);
176 set_buffer_verified(bh);
177 ext4_unlock_group(sb, block_group);
178 unlock_buffer(bh);
179 return bh;
180 }
181 ext4_unlock_group(sb, block_group);
182
183 if (buffer_uptodate(bh)) {
184 /*
185 * if not uninit if bh is uptodate,
186 * bitmap is also uptodate
187 */
188 set_bitmap_uptodate(bh);
189 unlock_buffer(bh);
190 goto verify;
191 }
192 /*
193 * submit the buffer_head for reading
194 */
195 trace_ext4_load_inode_bitmap(sb, block_group);
196 ext4_read_bh(bh, REQ_META | REQ_PRIO,
197 ext4_end_bitmap_read,
198 ext4_simulate_fail(sb, EXT4_SIM_IBITMAP_EIO));
199 if (!buffer_uptodate(bh)) {
200 put_bh(bh);
201 ext4_error_err(sb, EIO, "Cannot read inode bitmap - "
202 "block_group = %u, inode_bitmap = %llu",
203 block_group, bitmap_blk);
204 ext4_mark_group_bitmap_corrupted(sb, block_group,
205 EXT4_GROUP_INFO_IBITMAP_CORRUPT);
206 return ERR_PTR(-EIO);
207 }
208
209verify:
210 err = ext4_validate_inode_bitmap(sb, desc, block_group, bh);
211 if (err)
212 goto out;
213 return bh;
214out:
215 put_bh(bh);
216 return ERR_PTR(err);
217}
218
219/*
220 * NOTE! When we get the inode, we're the only people
221 * that have access to it, and as such there are no
222 * race conditions we have to worry about. The inode
223 * is not on the hash-lists, and it cannot be reached
224 * through the filesystem because the directory entry
225 * has been deleted earlier.
226 *
227 * HOWEVER: we must make sure that we get no aliases,
228 * which means that we have to call "clear_inode()"
229 * _before_ we mark the inode not in use in the inode
230 * bitmaps. Otherwise a newly created file might use
231 * the same inode number (not actually the same pointer
232 * though), and then we'd have two inodes sharing the
233 * same inode number and space on the harddisk.
234 */
235void ext4_free_inode(handle_t *handle, struct inode *inode)
236{
237 struct super_block *sb = inode->i_sb;
238 int is_directory;
239 unsigned long ino;
240 struct buffer_head *bitmap_bh = NULL;
241 struct buffer_head *bh2;
242 ext4_group_t block_group;
243 unsigned long bit;
244 struct ext4_group_desc *gdp;
245 struct ext4_super_block *es;
246 struct ext4_sb_info *sbi;
247 int fatal = 0, err, count, cleared;
248 struct ext4_group_info *grp;
249
250 if (!sb) {
251 printk(KERN_ERR "EXT4-fs: %s:%d: inode on "
252 "nonexistent device\n", __func__, __LINE__);
253 return;
254 }
255 if (atomic_read(&inode->i_count) > 1) {
256 ext4_msg(sb, KERN_ERR, "%s:%d: inode #%lu: count=%d",
257 __func__, __LINE__, inode->i_ino,
258 atomic_read(&inode->i_count));
259 return;
260 }
261 if (inode->i_nlink) {
262 ext4_msg(sb, KERN_ERR, "%s:%d: inode #%lu: nlink=%d\n",
263 __func__, __LINE__, inode->i_ino, inode->i_nlink);
264 return;
265 }
266 sbi = EXT4_SB(sb);
267
268 ino = inode->i_ino;
269 ext4_debug("freeing inode %lu\n", ino);
270 trace_ext4_free_inode(inode);
271
272 dquot_initialize(inode);
273 dquot_free_inode(inode);
274
275 is_directory = S_ISDIR(inode->i_mode);
276
277 /* Do this BEFORE marking the inode not in use or returning an error */
278 ext4_clear_inode(inode);
279
280 es = sbi->s_es;
281 if (ino < EXT4_FIRST_INO(sb) || ino > le32_to_cpu(es->s_inodes_count)) {
282 ext4_error(sb, "reserved or nonexistent inode %lu", ino);
283 goto error_return;
284 }
285 block_group = (ino - 1) / EXT4_INODES_PER_GROUP(sb);
286 bit = (ino - 1) % EXT4_INODES_PER_GROUP(sb);
287 bitmap_bh = ext4_read_inode_bitmap(sb, block_group);
288 /* Don't bother if the inode bitmap is corrupt. */
289 if (IS_ERR(bitmap_bh)) {
290 fatal = PTR_ERR(bitmap_bh);
291 bitmap_bh = NULL;
292 goto error_return;
293 }
294 if (!(sbi->s_mount_state & EXT4_FC_REPLAY)) {
295 grp = ext4_get_group_info(sb, block_group);
296 if (!grp || unlikely(EXT4_MB_GRP_IBITMAP_CORRUPT(grp))) {
297 fatal = -EFSCORRUPTED;
298 goto error_return;
299 }
300 }
301
302 BUFFER_TRACE(bitmap_bh, "get_write_access");
303 fatal = ext4_journal_get_write_access(handle, sb, bitmap_bh,
304 EXT4_JTR_NONE);
305 if (fatal)
306 goto error_return;
307
308 fatal = -ESRCH;
309 gdp = ext4_get_group_desc(sb, block_group, &bh2);
310 if (gdp) {
311 BUFFER_TRACE(bh2, "get_write_access");
312 fatal = ext4_journal_get_write_access(handle, sb, bh2,
313 EXT4_JTR_NONE);
314 }
315 ext4_lock_group(sb, block_group);
316 cleared = ext4_test_and_clear_bit(bit, bitmap_bh->b_data);
317 if (fatal || !cleared) {
318 ext4_unlock_group(sb, block_group);
319 goto out;
320 }
321
322 count = ext4_free_inodes_count(sb, gdp) + 1;
323 ext4_free_inodes_set(sb, gdp, count);
324 if (is_directory) {
325 count = ext4_used_dirs_count(sb, gdp) - 1;
326 ext4_used_dirs_set(sb, gdp, count);
327 if (percpu_counter_initialized(&sbi->s_dirs_counter))
328 percpu_counter_dec(&sbi->s_dirs_counter);
329 }
330 ext4_inode_bitmap_csum_set(sb, gdp, bitmap_bh);
331 ext4_group_desc_csum_set(sb, block_group, gdp);
332 ext4_unlock_group(sb, block_group);
333
334 if (percpu_counter_initialized(&sbi->s_freeinodes_counter))
335 percpu_counter_inc(&sbi->s_freeinodes_counter);
336 if (sbi->s_log_groups_per_flex) {
337 struct flex_groups *fg;
338
339 fg = sbi_array_rcu_deref(sbi, s_flex_groups,
340 ext4_flex_group(sbi, block_group));
341 atomic_inc(&fg->free_inodes);
342 if (is_directory)
343 atomic_dec(&fg->used_dirs);
344 }
345 BUFFER_TRACE(bh2, "call ext4_handle_dirty_metadata");
346 fatal = ext4_handle_dirty_metadata(handle, NULL, bh2);
347out:
348 if (cleared) {
349 BUFFER_TRACE(bitmap_bh, "call ext4_handle_dirty_metadata");
350 err = ext4_handle_dirty_metadata(handle, NULL, bitmap_bh);
351 if (!fatal)
352 fatal = err;
353 } else {
354 ext4_error(sb, "bit already cleared for inode %lu", ino);
355 ext4_mark_group_bitmap_corrupted(sb, block_group,
356 EXT4_GROUP_INFO_IBITMAP_CORRUPT);
357 }
358
359error_return:
360 brelse(bitmap_bh);
361 ext4_std_error(sb, fatal);
362}
363
364struct orlov_stats {
365 __u64 free_clusters;
366 __u32 free_inodes;
367 __u32 used_dirs;
368};
369
370/*
371 * Helper function for Orlov's allocator; returns critical information
372 * for a particular block group or flex_bg. If flex_size is 1, then g
373 * is a block group number; otherwise it is flex_bg number.
374 */
375static void get_orlov_stats(struct super_block *sb, ext4_group_t g,
376 int flex_size, struct orlov_stats *stats)
377{
378 struct ext4_group_desc *desc;
379
380 if (flex_size > 1) {
381 struct flex_groups *fg = sbi_array_rcu_deref(EXT4_SB(sb),
382 s_flex_groups, g);
383 stats->free_inodes = atomic_read(&fg->free_inodes);
384 stats->free_clusters = atomic64_read(&fg->free_clusters);
385 stats->used_dirs = atomic_read(&fg->used_dirs);
386 return;
387 }
388
389 desc = ext4_get_group_desc(sb, g, NULL);
390 if (desc) {
391 stats->free_inodes = ext4_free_inodes_count(sb, desc);
392 stats->free_clusters = ext4_free_group_clusters(sb, desc);
393 stats->used_dirs = ext4_used_dirs_count(sb, desc);
394 } else {
395 stats->free_inodes = 0;
396 stats->free_clusters = 0;
397 stats->used_dirs = 0;
398 }
399}
400
401/*
402 * Orlov's allocator for directories.
403 *
404 * We always try to spread first-level directories.
405 *
406 * If there are blockgroups with both free inodes and free clusters counts
407 * not worse than average we return one with smallest directory count.
408 * Otherwise we simply return a random group.
409 *
410 * For the rest rules look so:
411 *
412 * It's OK to put directory into a group unless
413 * it has too many directories already (max_dirs) or
414 * it has too few free inodes left (min_inodes) or
415 * it has too few free clusters left (min_clusters) or
416 * Parent's group is preferred, if it doesn't satisfy these
417 * conditions we search cyclically through the rest. If none
418 * of the groups look good we just look for a group with more
419 * free inodes than average (starting at parent's group).
420 */
421
422static int find_group_orlov(struct super_block *sb, struct inode *parent,
423 ext4_group_t *group, umode_t mode,
424 const struct qstr *qstr)
425{
426 ext4_group_t parent_group = EXT4_I(parent)->i_block_group;
427 struct ext4_sb_info *sbi = EXT4_SB(sb);
428 ext4_group_t real_ngroups = ext4_get_groups_count(sb);
429 int inodes_per_group = EXT4_INODES_PER_GROUP(sb);
430 unsigned int freei, avefreei, grp_free;
431 ext4_fsblk_t freec, avefreec;
432 unsigned int ndirs;
433 int max_dirs, min_inodes;
434 ext4_grpblk_t min_clusters;
435 ext4_group_t i, grp, g, ngroups;
436 struct ext4_group_desc *desc;
437 struct orlov_stats stats;
438 int flex_size = ext4_flex_bg_size(sbi);
439 struct dx_hash_info hinfo;
440
441 ngroups = real_ngroups;
442 if (flex_size > 1) {
443 ngroups = (real_ngroups + flex_size - 1) >>
444 sbi->s_log_groups_per_flex;
445 parent_group >>= sbi->s_log_groups_per_flex;
446 }
447
448 freei = percpu_counter_read_positive(&sbi->s_freeinodes_counter);
449 avefreei = freei / ngroups;
450 freec = percpu_counter_read_positive(&sbi->s_freeclusters_counter);
451 avefreec = freec;
452 do_div(avefreec, ngroups);
453 ndirs = percpu_counter_read_positive(&sbi->s_dirs_counter);
454
455 if (S_ISDIR(mode) &&
456 ((parent == d_inode(sb->s_root)) ||
457 (ext4_test_inode_flag(parent, EXT4_INODE_TOPDIR)))) {
458 int best_ndir = inodes_per_group;
459 int ret = -1;
460
461 if (qstr) {
462 hinfo.hash_version = DX_HASH_HALF_MD4;
463 hinfo.seed = sbi->s_hash_seed;
464 ext4fs_dirhash(parent, qstr->name, qstr->len, &hinfo);
465 parent_group = hinfo.hash % ngroups;
466 } else
467 parent_group = get_random_u32_below(ngroups);
468 for (i = 0; i < ngroups; i++) {
469 g = (parent_group + i) % ngroups;
470 get_orlov_stats(sb, g, flex_size, &stats);
471 if (!stats.free_inodes)
472 continue;
473 if (stats.used_dirs >= best_ndir)
474 continue;
475 if (stats.free_inodes < avefreei)
476 continue;
477 if (stats.free_clusters < avefreec)
478 continue;
479 grp = g;
480 ret = 0;
481 best_ndir = stats.used_dirs;
482 }
483 if (ret)
484 goto fallback;
485 found_flex_bg:
486 if (flex_size == 1) {
487 *group = grp;
488 return 0;
489 }
490
491 /*
492 * We pack inodes at the beginning of the flexgroup's
493 * inode tables. Block allocation decisions will do
494 * something similar, although regular files will
495 * start at 2nd block group of the flexgroup. See
496 * ext4_ext_find_goal() and ext4_find_near().
497 */
498 grp *= flex_size;
499 for (i = 0; i < flex_size; i++) {
500 if (grp+i >= real_ngroups)
501 break;
502 desc = ext4_get_group_desc(sb, grp+i, NULL);
503 if (desc && ext4_free_inodes_count(sb, desc)) {
504 *group = grp+i;
505 return 0;
506 }
507 }
508 goto fallback;
509 }
510
511 max_dirs = ndirs / ngroups + inodes_per_group*flex_size / 16;
512 min_inodes = avefreei - inodes_per_group*flex_size / 4;
513 if (min_inodes < 1)
514 min_inodes = 1;
515 min_clusters = avefreec - EXT4_CLUSTERS_PER_GROUP(sb)*flex_size / 4;
516 if (min_clusters < 0)
517 min_clusters = 0;
518
519 /*
520 * Start looking in the flex group where we last allocated an
521 * inode for this parent directory
522 */
523 if (EXT4_I(parent)->i_last_alloc_group != ~0) {
524 parent_group = EXT4_I(parent)->i_last_alloc_group;
525 if (flex_size > 1)
526 parent_group >>= sbi->s_log_groups_per_flex;
527 }
528
529 for (i = 0; i < ngroups; i++) {
530 grp = (parent_group + i) % ngroups;
531 get_orlov_stats(sb, grp, flex_size, &stats);
532 if (stats.used_dirs >= max_dirs)
533 continue;
534 if (stats.free_inodes < min_inodes)
535 continue;
536 if (stats.free_clusters < min_clusters)
537 continue;
538 goto found_flex_bg;
539 }
540
541fallback:
542 ngroups = real_ngroups;
543 avefreei = freei / ngroups;
544fallback_retry:
545 parent_group = EXT4_I(parent)->i_block_group;
546 for (i = 0; i < ngroups; i++) {
547 grp = (parent_group + i) % ngroups;
548 desc = ext4_get_group_desc(sb, grp, NULL);
549 if (desc) {
550 grp_free = ext4_free_inodes_count(sb, desc);
551 if (grp_free && grp_free >= avefreei) {
552 *group = grp;
553 return 0;
554 }
555 }
556 }
557
558 if (avefreei) {
559 /*
560 * The free-inodes counter is approximate, and for really small
561 * filesystems the above test can fail to find any blockgroups
562 */
563 avefreei = 0;
564 goto fallback_retry;
565 }
566
567 return -1;
568}
569
570static int find_group_other(struct super_block *sb, struct inode *parent,
571 ext4_group_t *group, umode_t mode)
572{
573 ext4_group_t parent_group = EXT4_I(parent)->i_block_group;
574 ext4_group_t i, last, ngroups = ext4_get_groups_count(sb);
575 struct ext4_group_desc *desc;
576 int flex_size = ext4_flex_bg_size(EXT4_SB(sb));
577
578 /*
579 * Try to place the inode is the same flex group as its
580 * parent. If we can't find space, use the Orlov algorithm to
581 * find another flex group, and store that information in the
582 * parent directory's inode information so that use that flex
583 * group for future allocations.
584 */
585 if (flex_size > 1) {
586 int retry = 0;
587
588 try_again:
589 parent_group &= ~(flex_size-1);
590 last = parent_group + flex_size;
591 if (last > ngroups)
592 last = ngroups;
593 for (i = parent_group; i < last; i++) {
594 desc = ext4_get_group_desc(sb, i, NULL);
595 if (desc && ext4_free_inodes_count(sb, desc)) {
596 *group = i;
597 return 0;
598 }
599 }
600 if (!retry && EXT4_I(parent)->i_last_alloc_group != ~0) {
601 retry = 1;
602 parent_group = EXT4_I(parent)->i_last_alloc_group;
603 goto try_again;
604 }
605 /*
606 * If this didn't work, use the Orlov search algorithm
607 * to find a new flex group; we pass in the mode to
608 * avoid the topdir algorithms.
609 */
610 *group = parent_group + flex_size;
611 if (*group > ngroups)
612 *group = 0;
613 return find_group_orlov(sb, parent, group, mode, NULL);
614 }
615
616 /*
617 * Try to place the inode in its parent directory
618 */
619 *group = parent_group;
620 desc = ext4_get_group_desc(sb, *group, NULL);
621 if (desc && ext4_free_inodes_count(sb, desc) &&
622 ext4_free_group_clusters(sb, desc))
623 return 0;
624
625 /*
626 * We're going to place this inode in a different blockgroup from its
627 * parent. We want to cause files in a common directory to all land in
628 * the same blockgroup. But we want files which are in a different
629 * directory which shares a blockgroup with our parent to land in a
630 * different blockgroup.
631 *
632 * So add our directory's i_ino into the starting point for the hash.
633 */
634 *group = (*group + parent->i_ino) % ngroups;
635
636 /*
637 * Use a quadratic hash to find a group with a free inode and some free
638 * blocks.
639 */
640 for (i = 1; i < ngroups; i <<= 1) {
641 *group += i;
642 if (*group >= ngroups)
643 *group -= ngroups;
644 desc = ext4_get_group_desc(sb, *group, NULL);
645 if (desc && ext4_free_inodes_count(sb, desc) &&
646 ext4_free_group_clusters(sb, desc))
647 return 0;
648 }
649
650 /*
651 * That failed: try linear search for a free inode, even if that group
652 * has no free blocks.
653 */
654 *group = parent_group;
655 for (i = 0; i < ngroups; i++) {
656 if (++*group >= ngroups)
657 *group = 0;
658 desc = ext4_get_group_desc(sb, *group, NULL);
659 if (desc && ext4_free_inodes_count(sb, desc))
660 return 0;
661 }
662
663 return -1;
664}
665
666/*
667 * In no journal mode, if an inode has recently been deleted, we want
668 * to avoid reusing it until we're reasonably sure the inode table
669 * block has been written back to disk. (Yes, these values are
670 * somewhat arbitrary...)
671 */
672#define RECENTCY_MIN 60
673#define RECENTCY_DIRTY 300
674
675static int recently_deleted(struct super_block *sb, ext4_group_t group, int ino)
676{
677 struct ext4_group_desc *gdp;
678 struct ext4_inode *raw_inode;
679 struct buffer_head *bh;
680 int inodes_per_block = EXT4_SB(sb)->s_inodes_per_block;
681 int offset, ret = 0;
682 int recentcy = RECENTCY_MIN;
683 u32 dtime, now;
684
685 gdp = ext4_get_group_desc(sb, group, NULL);
686 if (unlikely(!gdp))
687 return 0;
688
689 bh = sb_find_get_block(sb, ext4_inode_table(sb, gdp) +
690 (ino / inodes_per_block));
691 if (!bh || !buffer_uptodate(bh))
692 /*
693 * If the block is not in the buffer cache, then it
694 * must have been written out.
695 */
696 goto out;
697
698 offset = (ino % inodes_per_block) * EXT4_INODE_SIZE(sb);
699 raw_inode = (struct ext4_inode *) (bh->b_data + offset);
700
701 /* i_dtime is only 32 bits on disk, but we only care about relative
702 * times in the range of a few minutes (i.e. long enough to sync a
703 * recently-deleted inode to disk), so using the low 32 bits of the
704 * clock (a 68 year range) is enough, see time_before32() */
705 dtime = le32_to_cpu(raw_inode->i_dtime);
706 now = ktime_get_real_seconds();
707 if (buffer_dirty(bh))
708 recentcy += RECENTCY_DIRTY;
709
710 if (dtime && time_before32(dtime, now) &&
711 time_before32(now, dtime + recentcy))
712 ret = 1;
713out:
714 brelse(bh);
715 return ret;
716}
717
718static int find_inode_bit(struct super_block *sb, ext4_group_t group,
719 struct buffer_head *bitmap, unsigned long *ino)
720{
721 bool check_recently_deleted = EXT4_SB(sb)->s_journal == NULL;
722 unsigned long recently_deleted_ino = EXT4_INODES_PER_GROUP(sb);
723
724next:
725 *ino = ext4_find_next_zero_bit((unsigned long *)
726 bitmap->b_data,
727 EXT4_INODES_PER_GROUP(sb), *ino);
728 if (*ino >= EXT4_INODES_PER_GROUP(sb))
729 goto not_found;
730
731 if (check_recently_deleted && recently_deleted(sb, group, *ino)) {
732 recently_deleted_ino = *ino;
733 *ino = *ino + 1;
734 if (*ino < EXT4_INODES_PER_GROUP(sb))
735 goto next;
736 goto not_found;
737 }
738 return 1;
739not_found:
740 if (recently_deleted_ino >= EXT4_INODES_PER_GROUP(sb))
741 return 0;
742 /*
743 * Not reusing recently deleted inodes is mostly a preference. We don't
744 * want to report ENOSPC or skew allocation patterns because of that.
745 * So return even recently deleted inode if we could find better in the
746 * given range.
747 */
748 *ino = recently_deleted_ino;
749 return 1;
750}
751
752int ext4_mark_inode_used(struct super_block *sb, int ino)
753{
754 unsigned long max_ino = le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count);
755 struct buffer_head *inode_bitmap_bh = NULL, *group_desc_bh = NULL;
756 struct ext4_group_desc *gdp;
757 ext4_group_t group;
758 int bit;
759 int err;
760
761 if (ino < EXT4_FIRST_INO(sb) || ino > max_ino)
762 return -EFSCORRUPTED;
763
764 group = (ino - 1) / EXT4_INODES_PER_GROUP(sb);
765 bit = (ino - 1) % EXT4_INODES_PER_GROUP(sb);
766 inode_bitmap_bh = ext4_read_inode_bitmap(sb, group);
767 if (IS_ERR(inode_bitmap_bh))
768 return PTR_ERR(inode_bitmap_bh);
769
770 if (ext4_test_bit(bit, inode_bitmap_bh->b_data)) {
771 err = 0;
772 goto out;
773 }
774
775 gdp = ext4_get_group_desc(sb, group, &group_desc_bh);
776 if (!gdp) {
777 err = -EINVAL;
778 goto out;
779 }
780
781 ext4_set_bit(bit, inode_bitmap_bh->b_data);
782
783 BUFFER_TRACE(inode_bitmap_bh, "call ext4_handle_dirty_metadata");
784 err = ext4_handle_dirty_metadata(NULL, NULL, inode_bitmap_bh);
785 if (err) {
786 ext4_std_error(sb, err);
787 goto out;
788 }
789 err = sync_dirty_buffer(inode_bitmap_bh);
790 if (err) {
791 ext4_std_error(sb, err);
792 goto out;
793 }
794
795 /* We may have to initialize the block bitmap if it isn't already */
796 if (ext4_has_group_desc_csum(sb) &&
797 gdp->bg_flags & cpu_to_le16(EXT4_BG_BLOCK_UNINIT)) {
798 struct buffer_head *block_bitmap_bh;
799
800 block_bitmap_bh = ext4_read_block_bitmap(sb, group);
801 if (IS_ERR(block_bitmap_bh)) {
802 err = PTR_ERR(block_bitmap_bh);
803 goto out;
804 }
805
806 BUFFER_TRACE(block_bitmap_bh, "dirty block bitmap");
807 err = ext4_handle_dirty_metadata(NULL, NULL, block_bitmap_bh);
808 sync_dirty_buffer(block_bitmap_bh);
809
810 /* recheck and clear flag under lock if we still need to */
811 ext4_lock_group(sb, group);
812 if (ext4_has_group_desc_csum(sb) &&
813 (gdp->bg_flags & cpu_to_le16(EXT4_BG_BLOCK_UNINIT))) {
814 gdp->bg_flags &= cpu_to_le16(~EXT4_BG_BLOCK_UNINIT);
815 ext4_free_group_clusters_set(sb, gdp,
816 ext4_free_clusters_after_init(sb, group, gdp));
817 ext4_block_bitmap_csum_set(sb, gdp, block_bitmap_bh);
818 ext4_group_desc_csum_set(sb, group, gdp);
819 }
820 ext4_unlock_group(sb, group);
821 brelse(block_bitmap_bh);
822
823 if (err) {
824 ext4_std_error(sb, err);
825 goto out;
826 }
827 }
828
829 /* Update the relevant bg descriptor fields */
830 if (ext4_has_group_desc_csum(sb)) {
831 int free;
832
833 ext4_lock_group(sb, group); /* while we modify the bg desc */
834 free = EXT4_INODES_PER_GROUP(sb) -
835 ext4_itable_unused_count(sb, gdp);
836 if (gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_UNINIT)) {
837 gdp->bg_flags &= cpu_to_le16(~EXT4_BG_INODE_UNINIT);
838 free = 0;
839 }
840
841 /*
842 * Check the relative inode number against the last used
843 * relative inode number in this group. if it is greater
844 * we need to update the bg_itable_unused count
845 */
846 if (bit >= free)
847 ext4_itable_unused_set(sb, gdp,
848 (EXT4_INODES_PER_GROUP(sb) - bit - 1));
849 } else {
850 ext4_lock_group(sb, group);
851 }
852
853 ext4_free_inodes_set(sb, gdp, ext4_free_inodes_count(sb, gdp) - 1);
854 if (ext4_has_group_desc_csum(sb)) {
855 ext4_inode_bitmap_csum_set(sb, gdp, inode_bitmap_bh);
856 ext4_group_desc_csum_set(sb, group, gdp);
857 }
858
859 ext4_unlock_group(sb, group);
860 err = ext4_handle_dirty_metadata(NULL, NULL, group_desc_bh);
861 sync_dirty_buffer(group_desc_bh);
862out:
863 brelse(inode_bitmap_bh);
864 return err;
865}
866
867static int ext4_xattr_credits_for_new_inode(struct inode *dir, mode_t mode,
868 bool encrypt)
869{
870 struct super_block *sb = dir->i_sb;
871 int nblocks = 0;
872#ifdef CONFIG_EXT4_FS_POSIX_ACL
873 struct posix_acl *p = get_inode_acl(dir, ACL_TYPE_DEFAULT);
874
875 if (IS_ERR(p))
876 return PTR_ERR(p);
877 if (p) {
878 int acl_size = p->a_count * sizeof(ext4_acl_entry);
879
880 nblocks += (S_ISDIR(mode) ? 2 : 1) *
881 __ext4_xattr_set_credits(sb, NULL /* inode */,
882 NULL /* block_bh */, acl_size,
883 true /* is_create */);
884 posix_acl_release(p);
885 }
886#endif
887
888#ifdef CONFIG_SECURITY
889 {
890 int num_security_xattrs = 1;
891
892#ifdef CONFIG_INTEGRITY
893 num_security_xattrs++;
894#endif
895 /*
896 * We assume that security xattrs are never more than 1k.
897 * In practice they are under 128 bytes.
898 */
899 nblocks += num_security_xattrs *
900 __ext4_xattr_set_credits(sb, NULL /* inode */,
901 NULL /* block_bh */, 1024,
902 true /* is_create */);
903 }
904#endif
905 if (encrypt)
906 nblocks += __ext4_xattr_set_credits(sb,
907 NULL /* inode */,
908 NULL /* block_bh */,
909 FSCRYPT_SET_CONTEXT_MAX_SIZE,
910 true /* is_create */);
911 return nblocks;
912}
913
914/*
915 * There are two policies for allocating an inode. If the new inode is
916 * a directory, then a forward search is made for a block group with both
917 * free space and a low directory-to-inode ratio; if that fails, then of
918 * the groups with above-average free space, that group with the fewest
919 * directories already is chosen.
920 *
921 * For other inodes, search forward from the parent directory's block
922 * group to find a free inode.
923 */
924struct inode *__ext4_new_inode(struct mnt_idmap *idmap,
925 handle_t *handle, struct inode *dir,
926 umode_t mode, const struct qstr *qstr,
927 __u32 goal, uid_t *owner, __u32 i_flags,
928 int handle_type, unsigned int line_no,
929 int nblocks)
930{
931 struct super_block *sb;
932 struct buffer_head *inode_bitmap_bh = NULL;
933 struct buffer_head *group_desc_bh;
934 ext4_group_t ngroups, group = 0;
935 unsigned long ino = 0;
936 struct inode *inode;
937 struct ext4_group_desc *gdp = NULL;
938 struct ext4_inode_info *ei;
939 struct ext4_sb_info *sbi;
940 int ret2, err;
941 struct inode *ret;
942 ext4_group_t i;
943 ext4_group_t flex_group;
944 struct ext4_group_info *grp = NULL;
945 bool encrypt = false;
946
947 /* Cannot create files in a deleted directory */
948 if (!dir || !dir->i_nlink)
949 return ERR_PTR(-EPERM);
950
951 sb = dir->i_sb;
952 sbi = EXT4_SB(sb);
953
954 if (unlikely(ext4_forced_shutdown(sb)))
955 return ERR_PTR(-EIO);
956
957 ngroups = ext4_get_groups_count(sb);
958 trace_ext4_request_inode(dir, mode);
959 inode = new_inode(sb);
960 if (!inode)
961 return ERR_PTR(-ENOMEM);
962 ei = EXT4_I(inode);
963
964 /*
965 * Initialize owners and quota early so that we don't have to account
966 * for quota initialization worst case in standard inode creating
967 * transaction
968 */
969 if (owner) {
970 inode->i_mode = mode;
971 i_uid_write(inode, owner[0]);
972 i_gid_write(inode, owner[1]);
973 } else if (test_opt(sb, GRPID)) {
974 inode->i_mode = mode;
975 inode_fsuid_set(inode, idmap);
976 inode->i_gid = dir->i_gid;
977 } else
978 inode_init_owner(idmap, inode, dir, mode);
979
980 if (ext4_has_feature_project(sb) &&
981 ext4_test_inode_flag(dir, EXT4_INODE_PROJINHERIT))
982 ei->i_projid = EXT4_I(dir)->i_projid;
983 else
984 ei->i_projid = make_kprojid(&init_user_ns, EXT4_DEF_PROJID);
985
986 if (!(i_flags & EXT4_EA_INODE_FL)) {
987 err = fscrypt_prepare_new_inode(dir, inode, &encrypt);
988 if (err)
989 goto out;
990 }
991
992 err = dquot_initialize(inode);
993 if (err)
994 goto out;
995
996 if (!handle && sbi->s_journal && !(i_flags & EXT4_EA_INODE_FL)) {
997 ret2 = ext4_xattr_credits_for_new_inode(dir, mode, encrypt);
998 if (ret2 < 0) {
999 err = ret2;
1000 goto out;
1001 }
1002 nblocks += ret2;
1003 }
1004
1005 if (!goal)
1006 goal = sbi->s_inode_goal;
1007
1008 if (goal && goal <= le32_to_cpu(sbi->s_es->s_inodes_count)) {
1009 group = (goal - 1) / EXT4_INODES_PER_GROUP(sb);
1010 ino = (goal - 1) % EXT4_INODES_PER_GROUP(sb);
1011 ret2 = 0;
1012 goto got_group;
1013 }
1014
1015 if (S_ISDIR(mode))
1016 ret2 = find_group_orlov(sb, dir, &group, mode, qstr);
1017 else
1018 ret2 = find_group_other(sb, dir, &group, mode);
1019
1020got_group:
1021 EXT4_I(dir)->i_last_alloc_group = group;
1022 err = -ENOSPC;
1023 if (ret2 == -1)
1024 goto out;
1025
1026 /*
1027 * Normally we will only go through one pass of this loop,
1028 * unless we get unlucky and it turns out the group we selected
1029 * had its last inode grabbed by someone else.
1030 */
1031 for (i = 0; i < ngroups; i++, ino = 0) {
1032 err = -EIO;
1033
1034 gdp = ext4_get_group_desc(sb, group, &group_desc_bh);
1035 if (!gdp)
1036 goto out;
1037
1038 /*
1039 * Check free inodes count before loading bitmap.
1040 */
1041 if (ext4_free_inodes_count(sb, gdp) == 0)
1042 goto next_group;
1043
1044 if (!(sbi->s_mount_state & EXT4_FC_REPLAY)) {
1045 grp = ext4_get_group_info(sb, group);
1046 /*
1047 * Skip groups with already-known suspicious inode
1048 * tables
1049 */
1050 if (!grp || EXT4_MB_GRP_IBITMAP_CORRUPT(grp))
1051 goto next_group;
1052 }
1053
1054 brelse(inode_bitmap_bh);
1055 inode_bitmap_bh = ext4_read_inode_bitmap(sb, group);
1056 /* Skip groups with suspicious inode tables */
1057 if (IS_ERR(inode_bitmap_bh)) {
1058 inode_bitmap_bh = NULL;
1059 goto next_group;
1060 }
1061 if (!(sbi->s_mount_state & EXT4_FC_REPLAY) &&
1062 EXT4_MB_GRP_IBITMAP_CORRUPT(grp))
1063 goto next_group;
1064
1065 ret2 = find_inode_bit(sb, group, inode_bitmap_bh, &ino);
1066 if (!ret2)
1067 goto next_group;
1068
1069 if (group == 0 && (ino + 1) < EXT4_FIRST_INO(sb)) {
1070 ext4_error(sb, "reserved inode found cleared - "
1071 "inode=%lu", ino + 1);
1072 ext4_mark_group_bitmap_corrupted(sb, group,
1073 EXT4_GROUP_INFO_IBITMAP_CORRUPT);
1074 goto next_group;
1075 }
1076
1077 if ((!(sbi->s_mount_state & EXT4_FC_REPLAY)) && !handle) {
1078 BUG_ON(nblocks <= 0);
1079 handle = __ext4_journal_start_sb(NULL, dir->i_sb,
1080 line_no, handle_type, nblocks, 0,
1081 ext4_trans_default_revoke_credits(sb));
1082 if (IS_ERR(handle)) {
1083 err = PTR_ERR(handle);
1084 ext4_std_error(sb, err);
1085 goto out;
1086 }
1087 }
1088 BUFFER_TRACE(inode_bitmap_bh, "get_write_access");
1089 err = ext4_journal_get_write_access(handle, sb, inode_bitmap_bh,
1090 EXT4_JTR_NONE);
1091 if (err) {
1092 ext4_std_error(sb, err);
1093 goto out;
1094 }
1095 ext4_lock_group(sb, group);
1096 ret2 = ext4_test_and_set_bit(ino, inode_bitmap_bh->b_data);
1097 if (ret2) {
1098 /* Someone already took the bit. Repeat the search
1099 * with lock held.
1100 */
1101 ret2 = find_inode_bit(sb, group, inode_bitmap_bh, &ino);
1102 if (ret2) {
1103 ext4_set_bit(ino, inode_bitmap_bh->b_data);
1104 ret2 = 0;
1105 } else {
1106 ret2 = 1; /* we didn't grab the inode */
1107 }
1108 }
1109 ext4_unlock_group(sb, group);
1110 ino++; /* the inode bitmap is zero-based */
1111 if (!ret2)
1112 goto got; /* we grabbed the inode! */
1113
1114next_group:
1115 if (++group == ngroups)
1116 group = 0;
1117 }
1118 err = -ENOSPC;
1119 goto out;
1120
1121got:
1122 BUFFER_TRACE(inode_bitmap_bh, "call ext4_handle_dirty_metadata");
1123 err = ext4_handle_dirty_metadata(handle, NULL, inode_bitmap_bh);
1124 if (err) {
1125 ext4_std_error(sb, err);
1126 goto out;
1127 }
1128
1129 BUFFER_TRACE(group_desc_bh, "get_write_access");
1130 err = ext4_journal_get_write_access(handle, sb, group_desc_bh,
1131 EXT4_JTR_NONE);
1132 if (err) {
1133 ext4_std_error(sb, err);
1134 goto out;
1135 }
1136
1137 /* We may have to initialize the block bitmap if it isn't already */
1138 if (ext4_has_group_desc_csum(sb) &&
1139 gdp->bg_flags & cpu_to_le16(EXT4_BG_BLOCK_UNINIT)) {
1140 struct buffer_head *block_bitmap_bh;
1141
1142 block_bitmap_bh = ext4_read_block_bitmap(sb, group);
1143 if (IS_ERR(block_bitmap_bh)) {
1144 err = PTR_ERR(block_bitmap_bh);
1145 goto out;
1146 }
1147 BUFFER_TRACE(block_bitmap_bh, "get block bitmap access");
1148 err = ext4_journal_get_write_access(handle, sb, block_bitmap_bh,
1149 EXT4_JTR_NONE);
1150 if (err) {
1151 brelse(block_bitmap_bh);
1152 ext4_std_error(sb, err);
1153 goto out;
1154 }
1155
1156 BUFFER_TRACE(block_bitmap_bh, "dirty block bitmap");
1157 err = ext4_handle_dirty_metadata(handle, NULL, block_bitmap_bh);
1158
1159 /* recheck and clear flag under lock if we still need to */
1160 ext4_lock_group(sb, group);
1161 if (ext4_has_group_desc_csum(sb) &&
1162 (gdp->bg_flags & cpu_to_le16(EXT4_BG_BLOCK_UNINIT))) {
1163 gdp->bg_flags &= cpu_to_le16(~EXT4_BG_BLOCK_UNINIT);
1164 ext4_free_group_clusters_set(sb, gdp,
1165 ext4_free_clusters_after_init(sb, group, gdp));
1166 ext4_block_bitmap_csum_set(sb, gdp, block_bitmap_bh);
1167 ext4_group_desc_csum_set(sb, group, gdp);
1168 }
1169 ext4_unlock_group(sb, group);
1170 brelse(block_bitmap_bh);
1171
1172 if (err) {
1173 ext4_std_error(sb, err);
1174 goto out;
1175 }
1176 }
1177
1178 /* Update the relevant bg descriptor fields */
1179 if (ext4_has_group_desc_csum(sb)) {
1180 int free;
1181 struct ext4_group_info *grp = NULL;
1182
1183 if (!(sbi->s_mount_state & EXT4_FC_REPLAY)) {
1184 grp = ext4_get_group_info(sb, group);
1185 if (!grp) {
1186 err = -EFSCORRUPTED;
1187 goto out;
1188 }
1189 down_read(&grp->alloc_sem); /*
1190 * protect vs itable
1191 * lazyinit
1192 */
1193 }
1194 ext4_lock_group(sb, group); /* while we modify the bg desc */
1195 free = EXT4_INODES_PER_GROUP(sb) -
1196 ext4_itable_unused_count(sb, gdp);
1197 if (gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_UNINIT)) {
1198 gdp->bg_flags &= cpu_to_le16(~EXT4_BG_INODE_UNINIT);
1199 free = 0;
1200 }
1201 /*
1202 * Check the relative inode number against the last used
1203 * relative inode number in this group. if it is greater
1204 * we need to update the bg_itable_unused count
1205 */
1206 if (ino > free)
1207 ext4_itable_unused_set(sb, gdp,
1208 (EXT4_INODES_PER_GROUP(sb) - ino));
1209 if (!(sbi->s_mount_state & EXT4_FC_REPLAY))
1210 up_read(&grp->alloc_sem);
1211 } else {
1212 ext4_lock_group(sb, group);
1213 }
1214
1215 ext4_free_inodes_set(sb, gdp, ext4_free_inodes_count(sb, gdp) - 1);
1216 if (S_ISDIR(mode)) {
1217 ext4_used_dirs_set(sb, gdp, ext4_used_dirs_count(sb, gdp) + 1);
1218 if (sbi->s_log_groups_per_flex) {
1219 ext4_group_t f = ext4_flex_group(sbi, group);
1220
1221 atomic_inc(&sbi_array_rcu_deref(sbi, s_flex_groups,
1222 f)->used_dirs);
1223 }
1224 }
1225 if (ext4_has_group_desc_csum(sb)) {
1226 ext4_inode_bitmap_csum_set(sb, gdp, inode_bitmap_bh);
1227 ext4_group_desc_csum_set(sb, group, gdp);
1228 }
1229 ext4_unlock_group(sb, group);
1230
1231 BUFFER_TRACE(group_desc_bh, "call ext4_handle_dirty_metadata");
1232 err = ext4_handle_dirty_metadata(handle, NULL, group_desc_bh);
1233 if (err) {
1234 ext4_std_error(sb, err);
1235 goto out;
1236 }
1237
1238 percpu_counter_dec(&sbi->s_freeinodes_counter);
1239 if (S_ISDIR(mode))
1240 percpu_counter_inc(&sbi->s_dirs_counter);
1241
1242 if (sbi->s_log_groups_per_flex) {
1243 flex_group = ext4_flex_group(sbi, group);
1244 atomic_dec(&sbi_array_rcu_deref(sbi, s_flex_groups,
1245 flex_group)->free_inodes);
1246 }
1247
1248 inode->i_ino = ino + group * EXT4_INODES_PER_GROUP(sb);
1249 /* This is the optimal IO size (for stat), not the fs block size */
1250 inode->i_blocks = 0;
1251 simple_inode_init_ts(inode);
1252 ei->i_crtime = inode_get_mtime(inode);
1253
1254 memset(ei->i_data, 0, sizeof(ei->i_data));
1255 ei->i_dir_start_lookup = 0;
1256 ei->i_disksize = 0;
1257
1258 /* Don't inherit extent flag from directory, amongst others. */
1259 ei->i_flags =
1260 ext4_mask_flags(mode, EXT4_I(dir)->i_flags & EXT4_FL_INHERITED);
1261 ei->i_flags |= i_flags;
1262 ei->i_file_acl = 0;
1263 ei->i_dtime = 0;
1264 ei->i_block_group = group;
1265 ei->i_last_alloc_group = ~0;
1266
1267 ext4_set_inode_flags(inode, true);
1268 if (IS_DIRSYNC(inode))
1269 ext4_handle_sync(handle);
1270 if (insert_inode_locked(inode) < 0) {
1271 /*
1272 * Likely a bitmap corruption causing inode to be allocated
1273 * twice.
1274 */
1275 err = -EIO;
1276 ext4_error(sb, "failed to insert inode %lu: doubly allocated?",
1277 inode->i_ino);
1278 ext4_mark_group_bitmap_corrupted(sb, group,
1279 EXT4_GROUP_INFO_IBITMAP_CORRUPT);
1280 goto out;
1281 }
1282 inode->i_generation = get_random_u32();
1283
1284 /* Precompute checksum seed for inode metadata */
1285 if (ext4_has_metadata_csum(sb)) {
1286 __u32 csum;
1287 __le32 inum = cpu_to_le32(inode->i_ino);
1288 __le32 gen = cpu_to_le32(inode->i_generation);
1289 csum = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&inum,
1290 sizeof(inum));
1291 ei->i_csum_seed = ext4_chksum(sbi, csum, (__u8 *)&gen,
1292 sizeof(gen));
1293 }
1294
1295 ext4_clear_state_flags(ei); /* Only relevant on 32-bit archs */
1296 ext4_set_inode_state(inode, EXT4_STATE_NEW);
1297
1298 ei->i_extra_isize = sbi->s_want_extra_isize;
1299 ei->i_inline_off = 0;
1300 if (ext4_has_feature_inline_data(sb) &&
1301 (!(ei->i_flags & EXT4_DAX_FL) || S_ISDIR(mode)))
1302 ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
1303 ret = inode;
1304 err = dquot_alloc_inode(inode);
1305 if (err)
1306 goto fail_drop;
1307
1308 /*
1309 * Since the encryption xattr will always be unique, create it first so
1310 * that it's less likely to end up in an external xattr block and
1311 * prevent its deduplication.
1312 */
1313 if (encrypt) {
1314 err = fscrypt_set_context(inode, handle);
1315 if (err)
1316 goto fail_free_drop;
1317 }
1318
1319 if (!(ei->i_flags & EXT4_EA_INODE_FL)) {
1320 err = ext4_init_acl(handle, inode, dir);
1321 if (err)
1322 goto fail_free_drop;
1323
1324 err = ext4_init_security(handle, inode, dir, qstr);
1325 if (err)
1326 goto fail_free_drop;
1327 }
1328
1329 if (ext4_has_feature_extents(sb)) {
1330 /* set extent flag only for directory, file and normal symlink*/
1331 if (S_ISDIR(mode) || S_ISREG(mode) || S_ISLNK(mode)) {
1332 ext4_set_inode_flag(inode, EXT4_INODE_EXTENTS);
1333 ext4_ext_tree_init(handle, inode);
1334 }
1335 }
1336
1337 ext4_update_inode_fsync_trans(handle, inode, 1);
1338
1339 err = ext4_mark_inode_dirty(handle, inode);
1340 if (err) {
1341 ext4_std_error(sb, err);
1342 goto fail_free_drop;
1343 }
1344
1345 ext4_debug("allocating inode %lu\n", inode->i_ino);
1346 trace_ext4_allocate_inode(inode, dir, mode);
1347 brelse(inode_bitmap_bh);
1348 return ret;
1349
1350fail_free_drop:
1351 dquot_free_inode(inode);
1352fail_drop:
1353 clear_nlink(inode);
1354 unlock_new_inode(inode);
1355out:
1356 dquot_drop(inode);
1357 inode->i_flags |= S_NOQUOTA;
1358 iput(inode);
1359 brelse(inode_bitmap_bh);
1360 return ERR_PTR(err);
1361}
1362
1363/* Verify that we are loading a valid orphan from disk */
1364struct inode *ext4_orphan_get(struct super_block *sb, unsigned long ino)
1365{
1366 unsigned long max_ino = le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count);
1367 ext4_group_t block_group;
1368 int bit;
1369 struct buffer_head *bitmap_bh = NULL;
1370 struct inode *inode = NULL;
1371 int err = -EFSCORRUPTED;
1372
1373 if (ino < EXT4_FIRST_INO(sb) || ino > max_ino)
1374 goto bad_orphan;
1375
1376 block_group = (ino - 1) / EXT4_INODES_PER_GROUP(sb);
1377 bit = (ino - 1) % EXT4_INODES_PER_GROUP(sb);
1378 bitmap_bh = ext4_read_inode_bitmap(sb, block_group);
1379 if (IS_ERR(bitmap_bh))
1380 return ERR_CAST(bitmap_bh);
1381
1382 /* Having the inode bit set should be a 100% indicator that this
1383 * is a valid orphan (no e2fsck run on fs). Orphans also include
1384 * inodes that were being truncated, so we can't check i_nlink==0.
1385 */
1386 if (!ext4_test_bit(bit, bitmap_bh->b_data))
1387 goto bad_orphan;
1388
1389 inode = ext4_iget(sb, ino, EXT4_IGET_NORMAL);
1390 if (IS_ERR(inode)) {
1391 err = PTR_ERR(inode);
1392 ext4_error_err(sb, -err,
1393 "couldn't read orphan inode %lu (err %d)",
1394 ino, err);
1395 brelse(bitmap_bh);
1396 return inode;
1397 }
1398
1399 /*
1400 * If the orphans has i_nlinks > 0 then it should be able to
1401 * be truncated, otherwise it won't be removed from the orphan
1402 * list during processing and an infinite loop will result.
1403 * Similarly, it must not be a bad inode.
1404 */
1405 if ((inode->i_nlink && !ext4_can_truncate(inode)) ||
1406 is_bad_inode(inode))
1407 goto bad_orphan;
1408
1409 if (NEXT_ORPHAN(inode) > max_ino)
1410 goto bad_orphan;
1411 brelse(bitmap_bh);
1412 return inode;
1413
1414bad_orphan:
1415 ext4_error(sb, "bad orphan inode %lu", ino);
1416 if (bitmap_bh)
1417 printk(KERN_ERR "ext4_test_bit(bit=%d, block=%llu) = %d\n",
1418 bit, (unsigned long long)bitmap_bh->b_blocknr,
1419 ext4_test_bit(bit, bitmap_bh->b_data));
1420 if (inode) {
1421 printk(KERN_ERR "is_bad_inode(inode)=%d\n",
1422 is_bad_inode(inode));
1423 printk(KERN_ERR "NEXT_ORPHAN(inode)=%u\n",
1424 NEXT_ORPHAN(inode));
1425 printk(KERN_ERR "max_ino=%lu\n", max_ino);
1426 printk(KERN_ERR "i_nlink=%u\n", inode->i_nlink);
1427 /* Avoid freeing blocks if we got a bad deleted inode */
1428 if (inode->i_nlink == 0)
1429 inode->i_blocks = 0;
1430 iput(inode);
1431 }
1432 brelse(bitmap_bh);
1433 return ERR_PTR(err);
1434}
1435
1436unsigned long ext4_count_free_inodes(struct super_block *sb)
1437{
1438 unsigned long desc_count;
1439 struct ext4_group_desc *gdp;
1440 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
1441#ifdef EXT4FS_DEBUG
1442 struct ext4_super_block *es;
1443 unsigned long bitmap_count, x;
1444 struct buffer_head *bitmap_bh = NULL;
1445
1446 es = EXT4_SB(sb)->s_es;
1447 desc_count = 0;
1448 bitmap_count = 0;
1449 gdp = NULL;
1450 for (i = 0; i < ngroups; i++) {
1451 gdp = ext4_get_group_desc(sb, i, NULL);
1452 if (!gdp)
1453 continue;
1454 desc_count += ext4_free_inodes_count(sb, gdp);
1455 brelse(bitmap_bh);
1456 bitmap_bh = ext4_read_inode_bitmap(sb, i);
1457 if (IS_ERR(bitmap_bh)) {
1458 bitmap_bh = NULL;
1459 continue;
1460 }
1461
1462 x = ext4_count_free(bitmap_bh->b_data,
1463 EXT4_INODES_PER_GROUP(sb) / 8);
1464 printk(KERN_DEBUG "group %lu: stored = %d, counted = %lu\n",
1465 (unsigned long) i, ext4_free_inodes_count(sb, gdp), x);
1466 bitmap_count += x;
1467 }
1468 brelse(bitmap_bh);
1469 printk(KERN_DEBUG "ext4_count_free_inodes: "
1470 "stored = %u, computed = %lu, %lu\n",
1471 le32_to_cpu(es->s_free_inodes_count), desc_count, bitmap_count);
1472 return desc_count;
1473#else
1474 desc_count = 0;
1475 for (i = 0; i < ngroups; i++) {
1476 gdp = ext4_get_group_desc(sb, i, NULL);
1477 if (!gdp)
1478 continue;
1479 desc_count += ext4_free_inodes_count(sb, gdp);
1480 cond_resched();
1481 }
1482 return desc_count;
1483#endif
1484}
1485
1486/* Called at mount-time, super-block is locked */
1487unsigned long ext4_count_dirs(struct super_block * sb)
1488{
1489 unsigned long count = 0;
1490 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
1491
1492 for (i = 0; i < ngroups; i++) {
1493 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);
1494 if (!gdp)
1495 continue;
1496 count += ext4_used_dirs_count(sb, gdp);
1497 }
1498 return count;
1499}
1500
1501/*
1502 * Zeroes not yet zeroed inode table - just write zeroes through the whole
1503 * inode table. Must be called without any spinlock held. The only place
1504 * where it is called from on active part of filesystem is ext4lazyinit
1505 * thread, so we do not need any special locks, however we have to prevent
1506 * inode allocation from the current group, so we take alloc_sem lock, to
1507 * block ext4_new_inode() until we are finished.
1508 */
1509int ext4_init_inode_table(struct super_block *sb, ext4_group_t group,
1510 int barrier)
1511{
1512 struct ext4_group_info *grp = ext4_get_group_info(sb, group);
1513 struct ext4_sb_info *sbi = EXT4_SB(sb);
1514 struct ext4_group_desc *gdp = NULL;
1515 struct buffer_head *group_desc_bh;
1516 handle_t *handle;
1517 ext4_fsblk_t blk;
1518 int num, ret = 0, used_blks = 0;
1519 unsigned long used_inos = 0;
1520
1521 gdp = ext4_get_group_desc(sb, group, &group_desc_bh);
1522 if (!gdp || !grp)
1523 goto out;
1524
1525 /*
1526 * We do not need to lock this, because we are the only one
1527 * handling this flag.
1528 */
1529 if (gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED))
1530 goto out;
1531
1532 handle = ext4_journal_start_sb(sb, EXT4_HT_MISC, 1);
1533 if (IS_ERR(handle)) {
1534 ret = PTR_ERR(handle);
1535 goto out;
1536 }
1537
1538 down_write(&grp->alloc_sem);
1539 /*
1540 * If inode bitmap was already initialized there may be some
1541 * used inodes so we need to skip blocks with used inodes in
1542 * inode table.
1543 */
1544 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_UNINIT))) {
1545 used_inos = EXT4_INODES_PER_GROUP(sb) -
1546 ext4_itable_unused_count(sb, gdp);
1547 used_blks = DIV_ROUND_UP(used_inos, sbi->s_inodes_per_block);
1548
1549 /* Bogus inode unused count? */
1550 if (used_blks < 0 || used_blks > sbi->s_itb_per_group) {
1551 ext4_error(sb, "Something is wrong with group %u: "
1552 "used itable blocks: %d; "
1553 "itable unused count: %u",
1554 group, used_blks,
1555 ext4_itable_unused_count(sb, gdp));
1556 ret = 1;
1557 goto err_out;
1558 }
1559
1560 used_inos += group * EXT4_INODES_PER_GROUP(sb);
1561 /*
1562 * Are there some uninitialized inodes in the inode table
1563 * before the first normal inode?
1564 */
1565 if ((used_blks != sbi->s_itb_per_group) &&
1566 (used_inos < EXT4_FIRST_INO(sb))) {
1567 ext4_error(sb, "Something is wrong with group %u: "
1568 "itable unused count: %u; "
1569 "itables initialized count: %ld",
1570 group, ext4_itable_unused_count(sb, gdp),
1571 used_inos);
1572 ret = 1;
1573 goto err_out;
1574 }
1575 }
1576
1577 blk = ext4_inode_table(sb, gdp) + used_blks;
1578 num = sbi->s_itb_per_group - used_blks;
1579
1580 BUFFER_TRACE(group_desc_bh, "get_write_access");
1581 ret = ext4_journal_get_write_access(handle, sb, group_desc_bh,
1582 EXT4_JTR_NONE);
1583 if (ret)
1584 goto err_out;
1585
1586 /*
1587 * Skip zeroout if the inode table is full. But we set the ZEROED
1588 * flag anyway, because obviously, when it is full it does not need
1589 * further zeroing.
1590 */
1591 if (unlikely(num == 0))
1592 goto skip_zeroout;
1593
1594 ext4_debug("going to zero out inode table in group %d\n",
1595 group);
1596 ret = sb_issue_zeroout(sb, blk, num, GFP_NOFS);
1597 if (ret < 0)
1598 goto err_out;
1599 if (barrier)
1600 blkdev_issue_flush(sb->s_bdev);
1601
1602skip_zeroout:
1603 ext4_lock_group(sb, group);
1604 gdp->bg_flags |= cpu_to_le16(EXT4_BG_INODE_ZEROED);
1605 ext4_group_desc_csum_set(sb, group, gdp);
1606 ext4_unlock_group(sb, group);
1607
1608 BUFFER_TRACE(group_desc_bh,
1609 "call ext4_handle_dirty_metadata");
1610 ret = ext4_handle_dirty_metadata(handle, NULL,
1611 group_desc_bh);
1612
1613err_out:
1614 up_write(&grp->alloc_sem);
1615 ext4_journal_stop(handle);
1616out:
1617 return ret;
1618}