1 /*
2 * Ext4 orphan inode handling
3 */
4 #include <linux/fs.h>
5 #include <linux/quotaops.h>
6 #include <linux/buffer_head.h>
7
8 #include "ext4.h"
9 #include "ext4_jbd2.h"
10
ext4_orphan_file_add(handle_t * handle,struct inode * inode)11 static int ext4_orphan_file_add(handle_t *handle, struct inode *inode)
12 {
13 int i, j, start;
14 struct ext4_orphan_info *oi = &EXT4_SB(inode->i_sb)->s_orphan_info;
15 int ret = 0;
16 bool found = false;
17 __le32 *bdata;
18 int inodes_per_ob = ext4_inodes_per_orphan_block(inode->i_sb);
19 int looped = 0;
20
21 /*
22 * Find block with free orphan entry. Use CPU number for a naive hash
23 * for a search start in the orphan file
24 */
25 start = raw_smp_processor_id()*13 % oi->of_blocks;
26 i = start;
27 do {
28 if (atomic_dec_if_positive(&oi->of_binfo[i].ob_free_entries)
29 >= 0) {
30 found = true;
31 break;
32 }
33 if (++i >= oi->of_blocks)
34 i = 0;
35 } while (i != start);
36
37 if (!found) {
38 /*
39 * For now we don't grow or shrink orphan file. We just use
40 * whatever was allocated at mke2fs time. The additional
41 * credits we would have to reserve for each orphan inode
42 * operation just don't seem worth it.
43 */
44 return -ENOSPC;
45 }
46
47 ret = ext4_journal_get_write_access(handle, inode->i_sb,
48 oi->of_binfo[i].ob_bh, EXT4_JTR_ORPHAN_FILE);
49 if (ret) {
50 atomic_inc(&oi->of_binfo[i].ob_free_entries);
51 return ret;
52 }
53
54 bdata = (__le32 *)(oi->of_binfo[i].ob_bh->b_data);
55 /* Find empty slot in a block */
56 j = 0;
57 do {
58 if (looped) {
59 /*
60 * Did we walk through the block several times without
61 * finding free entry? It is theoretically possible
62 * if entries get constantly allocated and freed or
63 * if the block is corrupted. Avoid indefinite looping
64 * and bail. We'll use orphan list instead.
65 */
66 if (looped > 3) {
67 atomic_inc(&oi->of_binfo[i].ob_free_entries);
68 return -ENOSPC;
69 }
70 cond_resched();
71 }
72 while (bdata[j]) {
73 if (++j >= inodes_per_ob) {
74 j = 0;
75 looped++;
76 }
77 }
78 } while (cmpxchg(&bdata[j], (__le32)0, cpu_to_le32(inode->i_ino)) !=
79 (__le32)0);
80
81 EXT4_I(inode)->i_orphan_idx = i * inodes_per_ob + j;
82 ext4_set_inode_state(inode, EXT4_STATE_ORPHAN_FILE);
83
84 return ext4_handle_dirty_metadata(handle, NULL, oi->of_binfo[i].ob_bh);
85 }
86
87 /*
88 * ext4_orphan_add() links an unlinked or truncated inode into a list of
89 * such inodes, starting at the superblock, in case we crash before the
90 * file is closed/deleted, or in case the inode truncate spans multiple
91 * transactions and the last transaction is not recovered after a crash.
92 *
93 * At filesystem recovery time, we walk this list deleting unlinked
94 * inodes and truncating linked inodes in ext4_orphan_cleanup().
95 *
96 * Orphan list manipulation functions must be called under i_rwsem unless
97 * we are just creating the inode or deleting it.
98 */
ext4_orphan_add(handle_t * handle,struct inode * inode)99 int ext4_orphan_add(handle_t *handle, struct inode *inode)
100 {
101 struct super_block *sb = inode->i_sb;
102 struct ext4_sb_info *sbi = EXT4_SB(sb);
103 struct ext4_iloc iloc;
104 int err = 0, rc;
105 bool dirty = false;
106
107 if (!sbi->s_journal || is_bad_inode(inode))
108 return 0;
109
110 WARN_ON_ONCE(!(inode->i_state & (I_NEW | I_FREEING)) &&
111 !inode_is_locked(inode));
112 /*
113 * Inode orphaned in orphan file or in orphan list?
114 */
115 if (ext4_test_inode_state(inode, EXT4_STATE_ORPHAN_FILE) ||
116 !list_empty(&EXT4_I(inode)->i_orphan))
117 return 0;
118
119 /*
120 * Orphan handling is only valid for files with data blocks
121 * being truncated, or files being unlinked. Note that we either
122 * hold i_rwsem, or the inode can not be referenced from outside,
123 * so i_nlink should not be bumped due to race
124 */
125 ASSERT((S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
126 S_ISLNK(inode->i_mode)) || inode->i_nlink == 0);
127
128 if (sbi->s_orphan_info.of_blocks) {
129 err = ext4_orphan_file_add(handle, inode);
130 /*
131 * Fallback to normal orphan list of orphan file is
132 * out of space
133 */
134 if (err != -ENOSPC)
135 return err;
136 }
137
138 BUFFER_TRACE(sbi->s_sbh, "get_write_access");
139 err = ext4_journal_get_write_access(handle, sb, sbi->s_sbh,
140 EXT4_JTR_NONE);
141 if (err)
142 goto out;
143
144 err = ext4_reserve_inode_write(handle, inode, &iloc);
145 if (err)
146 goto out;
147
148 mutex_lock(&sbi->s_orphan_lock);
149 /*
150 * Due to previous errors inode may be already a part of on-disk
151 * orphan list. If so skip on-disk list modification.
152 */
153 if (!NEXT_ORPHAN(inode) || NEXT_ORPHAN(inode) >
154 (le32_to_cpu(sbi->s_es->s_inodes_count))) {
155 /* Insert this inode at the head of the on-disk orphan list */
156 NEXT_ORPHAN(inode) = le32_to_cpu(sbi->s_es->s_last_orphan);
157 lock_buffer(sbi->s_sbh);
158 sbi->s_es->s_last_orphan = cpu_to_le32(inode->i_ino);
159 ext4_superblock_csum_set(sb);
160 unlock_buffer(sbi->s_sbh);
161 dirty = true;
162 }
163 list_add(&EXT4_I(inode)->i_orphan, &sbi->s_orphan);
164 mutex_unlock(&sbi->s_orphan_lock);
165
166 if (dirty) {
167 err = ext4_handle_dirty_metadata(handle, NULL, sbi->s_sbh);
168 rc = ext4_mark_iloc_dirty(handle, inode, &iloc);
169 if (!err)
170 err = rc;
171 if (err) {
172 /*
173 * We have to remove inode from in-memory list if
174 * addition to on disk orphan list failed. Stray orphan
175 * list entries can cause panics at unmount time.
176 */
177 mutex_lock(&sbi->s_orphan_lock);
178 list_del_init(&EXT4_I(inode)->i_orphan);
179 mutex_unlock(&sbi->s_orphan_lock);
180 }
181 } else
182 brelse(iloc.bh);
183
184 ext4_debug("superblock will point to %lu\n", inode->i_ino);
185 ext4_debug("orphan inode %lu will point to %d\n",
186 inode->i_ino, NEXT_ORPHAN(inode));
187 out:
188 ext4_std_error(sb, err);
189 return err;
190 }
191
ext4_orphan_file_del(handle_t * handle,struct inode * inode)192 static int ext4_orphan_file_del(handle_t *handle, struct inode *inode)
193 {
194 struct ext4_orphan_info *oi = &EXT4_SB(inode->i_sb)->s_orphan_info;
195 __le32 *bdata;
196 int blk, off;
197 int inodes_per_ob = ext4_inodes_per_orphan_block(inode->i_sb);
198 int ret = 0;
199
200 if (!handle)
201 goto out;
202 blk = EXT4_I(inode)->i_orphan_idx / inodes_per_ob;
203 off = EXT4_I(inode)->i_orphan_idx % inodes_per_ob;
204 if (WARN_ON_ONCE(blk >= oi->of_blocks))
205 goto out;
206
207 ret = ext4_journal_get_write_access(handle, inode->i_sb,
208 oi->of_binfo[blk].ob_bh, EXT4_JTR_ORPHAN_FILE);
209 if (ret)
210 goto out;
211
212 bdata = (__le32 *)(oi->of_binfo[blk].ob_bh->b_data);
213 bdata[off] = 0;
214 atomic_inc(&oi->of_binfo[blk].ob_free_entries);
215 ret = ext4_handle_dirty_metadata(handle, NULL, oi->of_binfo[blk].ob_bh);
216 out:
217 ext4_clear_inode_state(inode, EXT4_STATE_ORPHAN_FILE);
218 INIT_LIST_HEAD(&EXT4_I(inode)->i_orphan);
219
220 return ret;
221 }
222
223 /*
224 * ext4_orphan_del() removes an unlinked or truncated inode from the list
225 * of such inodes stored on disk, because it is finally being cleaned up.
226 */
ext4_orphan_del(handle_t * handle,struct inode * inode)227 int ext4_orphan_del(handle_t *handle, struct inode *inode)
228 {
229 struct list_head *prev;
230 struct ext4_inode_info *ei = EXT4_I(inode);
231 struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
232 __u32 ino_next;
233 struct ext4_iloc iloc;
234 int err = 0;
235
236 if (!sbi->s_journal && !(sbi->s_mount_state & EXT4_ORPHAN_FS))
237 return 0;
238
239 WARN_ON_ONCE(!(inode->i_state & (I_NEW | I_FREEING)) &&
240 !inode_is_locked(inode));
241 if (ext4_test_inode_state(inode, EXT4_STATE_ORPHAN_FILE))
242 return ext4_orphan_file_del(handle, inode);
243
244 /* Do this quick check before taking global s_orphan_lock. */
245 if (list_empty(&ei->i_orphan))
246 return 0;
247
248 if (handle) {
249 /* Grab inode buffer early before taking global s_orphan_lock */
250 err = ext4_reserve_inode_write(handle, inode, &iloc);
251 }
252
253 mutex_lock(&sbi->s_orphan_lock);
254 ext4_debug("remove inode %lu from orphan list\n", inode->i_ino);
255
256 prev = ei->i_orphan.prev;
257 list_del_init(&ei->i_orphan);
258
259 /* If we're on an error path, we may not have a valid
260 * transaction handle with which to update the orphan list on
261 * disk, but we still need to remove the inode from the linked
262 * list in memory. */
263 if (!handle || err) {
264 mutex_unlock(&sbi->s_orphan_lock);
265 goto out_err;
266 }
267
268 ino_next = NEXT_ORPHAN(inode);
269 if (prev == &sbi->s_orphan) {
270 ext4_debug("superblock will point to %u\n", ino_next);
271 BUFFER_TRACE(sbi->s_sbh, "get_write_access");
272 err = ext4_journal_get_write_access(handle, inode->i_sb,
273 sbi->s_sbh, EXT4_JTR_NONE);
274 if (err) {
275 mutex_unlock(&sbi->s_orphan_lock);
276 goto out_brelse;
277 }
278 lock_buffer(sbi->s_sbh);
279 sbi->s_es->s_last_orphan = cpu_to_le32(ino_next);
280 ext4_superblock_csum_set(inode->i_sb);
281 unlock_buffer(sbi->s_sbh);
282 mutex_unlock(&sbi->s_orphan_lock);
283 err = ext4_handle_dirty_metadata(handle, NULL, sbi->s_sbh);
284 } else {
285 struct ext4_iloc iloc2;
286 struct inode *i_prev =
287 &list_entry(prev, struct ext4_inode_info, i_orphan)->vfs_inode;
288
289 ext4_debug("orphan inode %lu will point to %u\n",
290 i_prev->i_ino, ino_next);
291 err = ext4_reserve_inode_write(handle, i_prev, &iloc2);
292 if (err) {
293 mutex_unlock(&sbi->s_orphan_lock);
294 goto out_brelse;
295 }
296 NEXT_ORPHAN(i_prev) = ino_next;
297 err = ext4_mark_iloc_dirty(handle, i_prev, &iloc2);
298 mutex_unlock(&sbi->s_orphan_lock);
299 }
300 if (err)
301 goto out_brelse;
302 NEXT_ORPHAN(inode) = 0;
303 err = ext4_mark_iloc_dirty(handle, inode, &iloc);
304 out_err:
305 ext4_std_error(inode->i_sb, err);
306 return err;
307
308 out_brelse:
309 brelse(iloc.bh);
310 goto out_err;
311 }
312
313 #ifdef CONFIG_QUOTA
ext4_quota_on_mount(struct super_block * sb,int type)314 static int ext4_quota_on_mount(struct super_block *sb, int type)
315 {
316 return dquot_quota_on_mount(sb,
317 rcu_dereference_protected(EXT4_SB(sb)->s_qf_names[type],
318 lockdep_is_held(&sb->s_umount)),
319 EXT4_SB(sb)->s_jquota_fmt, type);
320 }
321 #endif
322
ext4_process_orphan(struct inode * inode,int * nr_truncates,int * nr_orphans)323 static void ext4_process_orphan(struct inode *inode,
324 int *nr_truncates, int *nr_orphans)
325 {
326 struct super_block *sb = inode->i_sb;
327 int ret;
328
329 dquot_initialize(inode);
330 if (inode->i_nlink) {
331 if (test_opt(sb, DEBUG))
332 ext4_msg(sb, KERN_DEBUG,
333 "%s: truncating inode %lu to %lld bytes",
334 __func__, inode->i_ino, inode->i_size);
335 ext4_debug("truncating inode %lu to %lld bytes\n",
336 inode->i_ino, inode->i_size);
337 inode_lock(inode);
338 truncate_inode_pages(inode->i_mapping, inode->i_size);
339 ret = ext4_truncate(inode);
340 if (ret) {
341 /*
342 * We need to clean up the in-core orphan list
343 * manually if ext4_truncate() failed to get a
344 * transaction handle.
345 */
346 ext4_orphan_del(NULL, inode);
347 ext4_std_error(inode->i_sb, ret);
348 }
349 inode_unlock(inode);
350 (*nr_truncates)++;
351 } else {
352 if (test_opt(sb, DEBUG))
353 ext4_msg(sb, KERN_DEBUG,
354 "%s: deleting unreferenced inode %lu",
355 __func__, inode->i_ino);
356 ext4_debug("deleting unreferenced inode %lu\n",
357 inode->i_ino);
358 (*nr_orphans)++;
359 }
360 iput(inode); /* The delete magic happens here! */
361 }
362
363 /* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
364 * the superblock) which were deleted from all directories, but held open by
365 * a process at the time of a crash. We walk the list and try to delete these
366 * inodes at recovery time (only with a read-write filesystem).
367 *
368 * In order to keep the orphan inode chain consistent during traversal (in
369 * case of crash during recovery), we link each inode into the superblock
370 * orphan list_head and handle it the same way as an inode deletion during
371 * normal operation (which journals the operations for us).
372 *
373 * We only do an iget() and an iput() on each inode, which is very safe if we
374 * accidentally point at an in-use or already deleted inode. The worst that
375 * can happen in this case is that we get a "bit already cleared" message from
376 * ext4_free_inode(). The only reason we would point at a wrong inode is if
377 * e2fsck was run on this filesystem, and it must have already done the orphan
378 * inode cleanup for us, so we can safely abort without any further action.
379 */
ext4_orphan_cleanup(struct super_block * sb,struct ext4_super_block * es)380 void ext4_orphan_cleanup(struct super_block *sb, struct ext4_super_block *es)
381 {
382 unsigned int s_flags = sb->s_flags;
383 int nr_orphans = 0, nr_truncates = 0;
384 struct inode *inode;
385 int i, j;
386 #ifdef CONFIG_QUOTA
387 int quota_update = 0;
388 #endif
389 __le32 *bdata;
390 struct ext4_orphan_info *oi = &EXT4_SB(sb)->s_orphan_info;
391 int inodes_per_ob = ext4_inodes_per_orphan_block(sb);
392
393 if (!es->s_last_orphan && !oi->of_blocks) {
394 ext4_debug("no orphan inodes to clean up\n");
395 return;
396 }
397
398 if (bdev_read_only(sb->s_bdev)) {
399 ext4_msg(sb, KERN_ERR, "write access "
400 "unavailable, skipping orphan cleanup");
401 return;
402 }
403
404 /* Check if feature set would not allow a r/w mount */
405 if (!ext4_feature_set_ok(sb, 0)) {
406 ext4_msg(sb, KERN_INFO, "Skipping orphan cleanup due to "
407 "unknown ROCOMPAT features");
408 return;
409 }
410
411 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
412 /* don't clear list on RO mount w/ errors */
413 if (es->s_last_orphan && !(s_flags & SB_RDONLY)) {
414 ext4_msg(sb, KERN_INFO, "Errors on filesystem, "
415 "clearing orphan list.");
416 es->s_last_orphan = 0;
417 }
418 ext4_debug("Skipping orphan recovery on fs with errors.\n");
419 return;
420 }
421
422 if (s_flags & SB_RDONLY) {
423 ext4_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
424 sb->s_flags &= ~SB_RDONLY;
425 }
426 #ifdef CONFIG_QUOTA
427 /*
428 * Turn on quotas which were not enabled for read-only mounts if
429 * filesystem has quota feature, so that they are updated correctly.
430 */
431 if (ext4_has_feature_quota(sb) && (s_flags & SB_RDONLY)) {
432 int ret = ext4_enable_quotas(sb);
433
434 if (!ret)
435 quota_update = 1;
436 else
437 ext4_msg(sb, KERN_ERR,
438 "Cannot turn on quotas: error %d", ret);
439 }
440
441 /* Turn on journaled quotas used for old sytle */
442 for (i = 0; i < EXT4_MAXQUOTAS; i++) {
443 if (EXT4_SB(sb)->s_qf_names[i]) {
444 int ret = ext4_quota_on_mount(sb, i);
445
446 if (!ret)
447 quota_update = 1;
448 else
449 ext4_msg(sb, KERN_ERR,
450 "Cannot turn on journaled "
451 "quota: type %d: error %d", i, ret);
452 }
453 }
454 #endif
455
456 while (es->s_last_orphan) {
457 /*
458 * We may have encountered an error during cleanup; if
459 * so, skip the rest.
460 */
461 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
462 ext4_debug("Skipping orphan recovery on fs with errors.\n");
463 es->s_last_orphan = 0;
464 break;
465 }
466
467 inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
468 if (IS_ERR(inode)) {
469 es->s_last_orphan = 0;
470 break;
471 }
472
473 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
474 ext4_process_orphan(inode, &nr_truncates, &nr_orphans);
475 }
476
477 for (i = 0; i < oi->of_blocks; i++) {
478 bdata = (__le32 *)(oi->of_binfo[i].ob_bh->b_data);
479 for (j = 0; j < inodes_per_ob; j++) {
480 if (!bdata[j])
481 continue;
482 inode = ext4_orphan_get(sb, le32_to_cpu(bdata[j]));
483 if (IS_ERR(inode))
484 continue;
485 ext4_set_inode_state(inode, EXT4_STATE_ORPHAN_FILE);
486 EXT4_I(inode)->i_orphan_idx = i * inodes_per_ob + j;
487 ext4_process_orphan(inode, &nr_truncates, &nr_orphans);
488 }
489 }
490
491 #define PLURAL(x) (x), ((x) == 1) ? "" : "s"
492
493 if (nr_orphans)
494 ext4_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
495 PLURAL(nr_orphans));
496 if (nr_truncates)
497 ext4_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
498 PLURAL(nr_truncates));
499 #ifdef CONFIG_QUOTA
500 /* Turn off quotas if they were enabled for orphan cleanup */
501 if (quota_update) {
502 for (i = 0; i < EXT4_MAXQUOTAS; i++) {
503 if (sb_dqopt(sb)->files[i])
504 dquot_quota_off(sb, i);
505 }
506 }
507 #endif
508 sb->s_flags = s_flags; /* Restore SB_RDONLY status */
509 }
510
ext4_release_orphan_info(struct super_block * sb)511 void ext4_release_orphan_info(struct super_block *sb)
512 {
513 int i;
514 struct ext4_orphan_info *oi = &EXT4_SB(sb)->s_orphan_info;
515
516 if (!oi->of_blocks)
517 return;
518 for (i = 0; i < oi->of_blocks; i++)
519 brelse(oi->of_binfo[i].ob_bh);
520 kfree(oi->of_binfo);
521 }
522
ext4_orphan_block_tail(struct super_block * sb,struct buffer_head * bh)523 static struct ext4_orphan_block_tail *ext4_orphan_block_tail(
524 struct super_block *sb,
525 struct buffer_head *bh)
526 {
527 return (struct ext4_orphan_block_tail *)(bh->b_data + sb->s_blocksize -
528 sizeof(struct ext4_orphan_block_tail));
529 }
530
ext4_orphan_file_block_csum_verify(struct super_block * sb,struct buffer_head * bh)531 static int ext4_orphan_file_block_csum_verify(struct super_block *sb,
532 struct buffer_head *bh)
533 {
534 __u32 calculated;
535 int inodes_per_ob = ext4_inodes_per_orphan_block(sb);
536 struct ext4_orphan_info *oi = &EXT4_SB(sb)->s_orphan_info;
537 struct ext4_orphan_block_tail *ot;
538 __le64 dsk_block_nr = cpu_to_le64(bh->b_blocknr);
539
540 if (!ext4_has_metadata_csum(sb))
541 return 1;
542
543 ot = ext4_orphan_block_tail(sb, bh);
544 calculated = ext4_chksum(EXT4_SB(sb), oi->of_csum_seed,
545 (__u8 *)&dsk_block_nr, sizeof(dsk_block_nr));
546 calculated = ext4_chksum(EXT4_SB(sb), calculated, (__u8 *)bh->b_data,
547 inodes_per_ob * sizeof(__u32));
548 return le32_to_cpu(ot->ob_checksum) == calculated;
549 }
550
551 /* This gets called only when checksumming is enabled */
ext4_orphan_file_block_trigger(struct jbd2_buffer_trigger_type * triggers,struct buffer_head * bh,void * data,size_t size)552 void ext4_orphan_file_block_trigger(struct jbd2_buffer_trigger_type *triggers,
553 struct buffer_head *bh,
554 void *data, size_t size)
555 {
556 struct super_block *sb = EXT4_TRIGGER(triggers)->sb;
557 __u32 csum;
558 int inodes_per_ob = ext4_inodes_per_orphan_block(sb);
559 struct ext4_orphan_info *oi = &EXT4_SB(sb)->s_orphan_info;
560 struct ext4_orphan_block_tail *ot;
561 __le64 dsk_block_nr = cpu_to_le64(bh->b_blocknr);
562
563 csum = ext4_chksum(EXT4_SB(sb), oi->of_csum_seed,
564 (__u8 *)&dsk_block_nr, sizeof(dsk_block_nr));
565 csum = ext4_chksum(EXT4_SB(sb), csum, (__u8 *)data,
566 inodes_per_ob * sizeof(__u32));
567 ot = ext4_orphan_block_tail(sb, bh);
568 ot->ob_checksum = cpu_to_le32(csum);
569 }
570
ext4_init_orphan_info(struct super_block * sb)571 int ext4_init_orphan_info(struct super_block *sb)
572 {
573 struct ext4_orphan_info *oi = &EXT4_SB(sb)->s_orphan_info;
574 struct inode *inode;
575 int i, j;
576 int ret;
577 int free;
578 __le32 *bdata;
579 int inodes_per_ob = ext4_inodes_per_orphan_block(sb);
580 struct ext4_orphan_block_tail *ot;
581 ino_t orphan_ino = le32_to_cpu(EXT4_SB(sb)->s_es->s_orphan_file_inum);
582
583 if (!ext4_has_feature_orphan_file(sb))
584 return 0;
585
586 inode = ext4_iget(sb, orphan_ino, EXT4_IGET_SPECIAL);
587 if (IS_ERR(inode)) {
588 ext4_msg(sb, KERN_ERR, "get orphan inode failed");
589 return PTR_ERR(inode);
590 }
591 oi->of_blocks = inode->i_size >> sb->s_blocksize_bits;
592 oi->of_csum_seed = EXT4_I(inode)->i_csum_seed;
593 oi->of_binfo = kmalloc(oi->of_blocks*sizeof(struct ext4_orphan_block),
594 GFP_KERNEL);
595 if (!oi->of_binfo) {
596 ret = -ENOMEM;
597 goto out_put;
598 }
599 for (i = 0; i < oi->of_blocks; i++) {
600 oi->of_binfo[i].ob_bh = ext4_bread(NULL, inode, i, 0);
601 if (IS_ERR(oi->of_binfo[i].ob_bh)) {
602 ret = PTR_ERR(oi->of_binfo[i].ob_bh);
603 goto out_free;
604 }
605 if (!oi->of_binfo[i].ob_bh) {
606 ret = -EIO;
607 goto out_free;
608 }
609 ot = ext4_orphan_block_tail(sb, oi->of_binfo[i].ob_bh);
610 if (le32_to_cpu(ot->ob_magic) != EXT4_ORPHAN_BLOCK_MAGIC) {
611 ext4_error(sb, "orphan file block %d: bad magic", i);
612 ret = -EIO;
613 goto out_free;
614 }
615 if (!ext4_orphan_file_block_csum_verify(sb,
616 oi->of_binfo[i].ob_bh)) {
617 ext4_error(sb, "orphan file block %d: bad checksum", i);
618 ret = -EIO;
619 goto out_free;
620 }
621 bdata = (__le32 *)(oi->of_binfo[i].ob_bh->b_data);
622 free = 0;
623 for (j = 0; j < inodes_per_ob; j++)
624 if (bdata[j] == 0)
625 free++;
626 atomic_set(&oi->of_binfo[i].ob_free_entries, free);
627 }
628 iput(inode);
629 return 0;
630 out_free:
631 for (i--; i >= 0; i--)
632 brelse(oi->of_binfo[i].ob_bh);
633 kfree(oi->of_binfo);
634 out_put:
635 iput(inode);
636 return ret;
637 }
638
ext4_orphan_file_empty(struct super_block * sb)639 int ext4_orphan_file_empty(struct super_block *sb)
640 {
641 struct ext4_orphan_info *oi = &EXT4_SB(sb)->s_orphan_info;
642 int i;
643 int inodes_per_ob = ext4_inodes_per_orphan_block(sb);
644
645 if (!ext4_has_feature_orphan_file(sb))
646 return 1;
647 for (i = 0; i < oi->of_blocks; i++)
648 if (atomic_read(&oi->of_binfo[i].ob_free_entries) !=
649 inodes_per_ob)
650 return 0;
651 return 1;
652 }
653