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authorArtem Bityutskiy <Artem.Bityutskiy@nokia.com>2008-07-14 12:08:37 -0400
committerArtem Bityutskiy <Artem.Bityutskiy@nokia.com>2008-07-15 10:35:15 -0400
commit1e51764a3c2ac05a23a22b2a95ddee4d9bffb16d (patch)
tree919debdd48aef9eee9ff0e8f465ef2649325b993 /fs/ubifs/commit.c
parente56a99d5a42dcb91e622ae7a0289d8fb2ddabffb (diff)
UBIFS: add new flash file system
This is a new flash file system. See http://www.linux-mtd.infradead.org/doc/ubifs.html Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com> Signed-off-by: Adrian Hunter <ext-adrian.hunter@nokia.com>
Diffstat (limited to 'fs/ubifs/commit.c')
-rw-r--r--fs/ubifs/commit.c677
1 files changed, 677 insertions, 0 deletions
diff --git a/fs/ubifs/commit.c b/fs/ubifs/commit.c
new file mode 100644
index 000000000000..3b516316c9b3
--- /dev/null
+++ b/fs/ubifs/commit.c
@@ -0,0 +1,677 @@
1/*
2 * This file is part of UBIFS.
3 *
4 * Copyright (C) 2006-2008 Nokia Corporation.
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 as published by
8 * the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
13 * more details.
14 *
15 * You should have received a copy of the GNU General Public License along with
16 * this program; if not, write to the Free Software Foundation, Inc., 51
17 * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
18 *
19 * Authors: Adrian Hunter
20 * Artem Bityutskiy (Битюцкий Артём)
21 */
22
23/*
24 * This file implements functions that manage the running of the commit process.
25 * Each affected module has its own functions to accomplish their part in the
26 * commit and those functions are called here.
27 *
28 * The commit is the process whereby all updates to the index and LEB properties
29 * are written out together and the journal becomes empty. This keeps the
30 * file system consistent - at all times the state can be recreated by reading
31 * the index and LEB properties and then replaying the journal.
32 *
33 * The commit is split into two parts named "commit start" and "commit end".
34 * During commit start, the commit process has exclusive access to the journal
35 * by holding the commit semaphore down for writing. As few I/O operations as
36 * possible are performed during commit start, instead the nodes that are to be
37 * written are merely identified. During commit end, the commit semaphore is no
38 * longer held and the journal is again in operation, allowing users to continue
39 * to use the file system while the bulk of the commit I/O is performed. The
40 * purpose of this two-step approach is to prevent the commit from causing any
41 * latency blips. Note that in any case, the commit does not prevent lookups
42 * (as permitted by the TNC mutex), or access to VFS data structures e.g. page
43 * cache.
44 */
45
46#include <linux/freezer.h>
47#include <linux/kthread.h>
48#include "ubifs.h"
49
50/**
51 * do_commit - commit the journal.
52 * @c: UBIFS file-system description object
53 *
54 * This function implements UBIFS commit. It has to be called with commit lock
55 * locked. Returns zero in case of success and a negative error code in case of
56 * failure.
57 */
58static int do_commit(struct ubifs_info *c)
59{
60 int err, new_ltail_lnum, old_ltail_lnum, i;
61 struct ubifs_zbranch zroot;
62 struct ubifs_lp_stats lst;
63
64 dbg_cmt("start");
65 if (c->ro_media) {
66 err = -EROFS;
67 goto out_up;
68 }
69
70 /* Sync all write buffers (necessary for recovery) */
71 for (i = 0; i < c->jhead_cnt; i++) {
72 err = ubifs_wbuf_sync(&c->jheads[i].wbuf);
73 if (err)
74 goto out_up;
75 }
76
77 err = ubifs_gc_start_commit(c);
78 if (err)
79 goto out_up;
80 err = dbg_check_lprops(c);
81 if (err)
82 goto out_up;
83 err = ubifs_log_start_commit(c, &new_ltail_lnum);
84 if (err)
85 goto out_up;
86 err = ubifs_tnc_start_commit(c, &zroot);
87 if (err)
88 goto out_up;
89 err = ubifs_lpt_start_commit(c);
90 if (err)
91 goto out_up;
92 err = ubifs_orphan_start_commit(c);
93 if (err)
94 goto out_up;
95
96 ubifs_get_lp_stats(c, &lst);
97
98 up_write(&c->commit_sem);
99
100 err = ubifs_tnc_end_commit(c);
101 if (err)
102 goto out;
103 err = ubifs_lpt_end_commit(c);
104 if (err)
105 goto out;
106 err = ubifs_orphan_end_commit(c);
107 if (err)
108 goto out;
109 old_ltail_lnum = c->ltail_lnum;
110 err = ubifs_log_end_commit(c, new_ltail_lnum);
111 if (err)
112 goto out;
113 err = dbg_check_old_index(c, &zroot);
114 if (err)
115 goto out;
116
117 mutex_lock(&c->mst_mutex);
118 c->mst_node->cmt_no = cpu_to_le64(++c->cmt_no);
119 c->mst_node->log_lnum = cpu_to_le32(new_ltail_lnum);
120 c->mst_node->root_lnum = cpu_to_le32(zroot.lnum);
121 c->mst_node->root_offs = cpu_to_le32(zroot.offs);
122 c->mst_node->root_len = cpu_to_le32(zroot.len);
123 c->mst_node->ihead_lnum = cpu_to_le32(c->ihead_lnum);
124 c->mst_node->ihead_offs = cpu_to_le32(c->ihead_offs);
125 c->mst_node->index_size = cpu_to_le64(c->old_idx_sz);
126 c->mst_node->lpt_lnum = cpu_to_le32(c->lpt_lnum);
127 c->mst_node->lpt_offs = cpu_to_le32(c->lpt_offs);
128 c->mst_node->nhead_lnum = cpu_to_le32(c->nhead_lnum);
129 c->mst_node->nhead_offs = cpu_to_le32(c->nhead_offs);
130 c->mst_node->ltab_lnum = cpu_to_le32(c->ltab_lnum);
131 c->mst_node->ltab_offs = cpu_to_le32(c->ltab_offs);
132 c->mst_node->lsave_lnum = cpu_to_le32(c->lsave_lnum);
133 c->mst_node->lsave_offs = cpu_to_le32(c->lsave_offs);
134 c->mst_node->lscan_lnum = cpu_to_le32(c->lscan_lnum);
135 c->mst_node->empty_lebs = cpu_to_le32(lst.empty_lebs);
136 c->mst_node->idx_lebs = cpu_to_le32(lst.idx_lebs);
137 c->mst_node->total_free = cpu_to_le64(lst.total_free);
138 c->mst_node->total_dirty = cpu_to_le64(lst.total_dirty);
139 c->mst_node->total_used = cpu_to_le64(lst.total_used);
140 c->mst_node->total_dead = cpu_to_le64(lst.total_dead);
141 c->mst_node->total_dark = cpu_to_le64(lst.total_dark);
142 if (c->no_orphs)
143 c->mst_node->flags |= cpu_to_le32(UBIFS_MST_NO_ORPHS);
144 else
145 c->mst_node->flags &= ~cpu_to_le32(UBIFS_MST_NO_ORPHS);
146 err = ubifs_write_master(c);
147 mutex_unlock(&c->mst_mutex);
148 if (err)
149 goto out;
150
151 err = ubifs_log_post_commit(c, old_ltail_lnum);
152 if (err)
153 goto out;
154 err = ubifs_gc_end_commit(c);
155 if (err)
156 goto out;
157 err = ubifs_lpt_post_commit(c);
158 if (err)
159 goto out;
160
161 spin_lock(&c->cs_lock);
162 c->cmt_state = COMMIT_RESTING;
163 wake_up(&c->cmt_wq);
164 dbg_cmt("commit end");
165 spin_unlock(&c->cs_lock);
166
167 return 0;
168
169out_up:
170 up_write(&c->commit_sem);
171out:
172 ubifs_err("commit failed, error %d", err);
173 spin_lock(&c->cs_lock);
174 c->cmt_state = COMMIT_BROKEN;
175 wake_up(&c->cmt_wq);
176 spin_unlock(&c->cs_lock);
177 ubifs_ro_mode(c, err);
178 return err;
179}
180
181/**
182 * run_bg_commit - run background commit if it is needed.
183 * @c: UBIFS file-system description object
184 *
185 * This function runs background commit if it is needed. Returns zero in case
186 * of success and a negative error code in case of failure.
187 */
188static int run_bg_commit(struct ubifs_info *c)
189{
190 spin_lock(&c->cs_lock);
191 /*
192 * Run background commit only if background commit was requested or if
193 * commit is required.
194 */
195 if (c->cmt_state != COMMIT_BACKGROUND &&
196 c->cmt_state != COMMIT_REQUIRED)
197 goto out;
198 spin_unlock(&c->cs_lock);
199
200 down_write(&c->commit_sem);
201 spin_lock(&c->cs_lock);
202 if (c->cmt_state == COMMIT_REQUIRED)
203 c->cmt_state = COMMIT_RUNNING_REQUIRED;
204 else if (c->cmt_state == COMMIT_BACKGROUND)
205 c->cmt_state = COMMIT_RUNNING_BACKGROUND;
206 else
207 goto out_cmt_unlock;
208 spin_unlock(&c->cs_lock);
209
210 return do_commit(c);
211
212out_cmt_unlock:
213 up_write(&c->commit_sem);
214out:
215 spin_unlock(&c->cs_lock);
216 return 0;
217}
218
219/**
220 * ubifs_bg_thread - UBIFS background thread function.
221 * @info: points to the file-system description object
222 *
223 * This function implements various file-system background activities:
224 * o when a write-buffer timer expires it synchronizes the appropriate
225 * write-buffer;
226 * o when the journal is about to be full, it starts in-advance commit.
227 *
228 * Note, other stuff like background garbage collection may be added here in
229 * future.
230 */
231int ubifs_bg_thread(void *info)
232{
233 int err;
234 struct ubifs_info *c = info;
235
236 ubifs_msg("background thread \"%s\" started, PID %d",
237 c->bgt_name, current->pid);
238 set_freezable();
239
240 while (1) {
241 if (kthread_should_stop())
242 break;
243
244 if (try_to_freeze())
245 continue;
246
247 set_current_state(TASK_INTERRUPTIBLE);
248 /* Check if there is something to do */
249 if (!c->need_bgt) {
250 /*
251 * Nothing prevents us from going sleep now and
252 * be never woken up and block the task which
253 * could wait in 'kthread_stop()' forever.
254 */
255 if (kthread_should_stop())
256 break;
257 schedule();
258 continue;
259 } else
260 __set_current_state(TASK_RUNNING);
261
262 c->need_bgt = 0;
263 err = ubifs_bg_wbufs_sync(c);
264 if (err)
265 ubifs_ro_mode(c, err);
266
267 run_bg_commit(c);
268 cond_resched();
269 }
270
271 dbg_msg("background thread \"%s\" stops", c->bgt_name);
272 return 0;
273}
274
275/**
276 * ubifs_commit_required - set commit state to "required".
277 * @c: UBIFS file-system description object
278 *
279 * This function is called if a commit is required but cannot be done from the
280 * calling function, so it is just flagged instead.
281 */
282void ubifs_commit_required(struct ubifs_info *c)
283{
284 spin_lock(&c->cs_lock);
285 switch (c->cmt_state) {
286 case COMMIT_RESTING:
287 case COMMIT_BACKGROUND:
288 dbg_cmt("old: %s, new: %s", dbg_cstate(c->cmt_state),
289 dbg_cstate(COMMIT_REQUIRED));
290 c->cmt_state = COMMIT_REQUIRED;
291 break;
292 case COMMIT_RUNNING_BACKGROUND:
293 dbg_cmt("old: %s, new: %s", dbg_cstate(c->cmt_state),
294 dbg_cstate(COMMIT_RUNNING_REQUIRED));
295 c->cmt_state = COMMIT_RUNNING_REQUIRED;
296 break;
297 case COMMIT_REQUIRED:
298 case COMMIT_RUNNING_REQUIRED:
299 case COMMIT_BROKEN:
300 break;
301 }
302 spin_unlock(&c->cs_lock);
303}
304
305/**
306 * ubifs_request_bg_commit - notify the background thread to do a commit.
307 * @c: UBIFS file-system description object
308 *
309 * This function is called if the journal is full enough to make a commit
310 * worthwhile, so background thread is kicked to start it.
311 */
312void ubifs_request_bg_commit(struct ubifs_info *c)
313{
314 spin_lock(&c->cs_lock);
315 if (c->cmt_state == COMMIT_RESTING) {
316 dbg_cmt("old: %s, new: %s", dbg_cstate(c->cmt_state),
317 dbg_cstate(COMMIT_BACKGROUND));
318 c->cmt_state = COMMIT_BACKGROUND;
319 spin_unlock(&c->cs_lock);
320 ubifs_wake_up_bgt(c);
321 } else
322 spin_unlock(&c->cs_lock);
323}
324
325/**
326 * wait_for_commit - wait for commit.
327 * @c: UBIFS file-system description object
328 *
329 * This function sleeps until the commit operation is no longer running.
330 */
331static int wait_for_commit(struct ubifs_info *c)
332{
333 dbg_cmt("pid %d goes sleep", current->pid);
334
335 /*
336 * The following sleeps if the condition is false, and will be woken
337 * when the commit ends. It is possible, although very unlikely, that we
338 * will wake up and see the subsequent commit running, rather than the
339 * one we were waiting for, and go back to sleep. However, we will be
340 * woken again, so there is no danger of sleeping forever.
341 */
342 wait_event(c->cmt_wq, c->cmt_state != COMMIT_RUNNING_BACKGROUND &&
343 c->cmt_state != COMMIT_RUNNING_REQUIRED);
344 dbg_cmt("commit finished, pid %d woke up", current->pid);
345 return 0;
346}
347
348/**
349 * ubifs_run_commit - run or wait for commit.
350 * @c: UBIFS file-system description object
351 *
352 * This function runs commit and returns zero in case of success and a negative
353 * error code in case of failure.
354 */
355int ubifs_run_commit(struct ubifs_info *c)
356{
357 int err = 0;
358
359 spin_lock(&c->cs_lock);
360 if (c->cmt_state == COMMIT_BROKEN) {
361 err = -EINVAL;
362 goto out;
363 }
364
365 if (c->cmt_state == COMMIT_RUNNING_BACKGROUND)
366 /*
367 * We set the commit state to 'running required' to indicate
368 * that we want it to complete as quickly as possible.
369 */
370 c->cmt_state = COMMIT_RUNNING_REQUIRED;
371
372 if (c->cmt_state == COMMIT_RUNNING_REQUIRED) {
373 spin_unlock(&c->cs_lock);
374 return wait_for_commit(c);
375 }
376 spin_unlock(&c->cs_lock);
377
378 /* Ok, the commit is indeed needed */
379
380 down_write(&c->commit_sem);
381 spin_lock(&c->cs_lock);
382 /*
383 * Since we unlocked 'c->cs_lock', the state may have changed, so
384 * re-check it.
385 */
386 if (c->cmt_state == COMMIT_BROKEN) {
387 err = -EINVAL;
388 goto out_cmt_unlock;
389 }
390
391 if (c->cmt_state == COMMIT_RUNNING_BACKGROUND)
392 c->cmt_state = COMMIT_RUNNING_REQUIRED;
393
394 if (c->cmt_state == COMMIT_RUNNING_REQUIRED) {
395 up_write(&c->commit_sem);
396 spin_unlock(&c->cs_lock);
397 return wait_for_commit(c);
398 }
399 c->cmt_state = COMMIT_RUNNING_REQUIRED;
400 spin_unlock(&c->cs_lock);
401
402 err = do_commit(c);
403 return err;
404
405out_cmt_unlock:
406 up_write(&c->commit_sem);
407out:
408 spin_unlock(&c->cs_lock);
409 return err;
410}
411
412/**
413 * ubifs_gc_should_commit - determine if it is time for GC to run commit.
414 * @c: UBIFS file-system description object
415 *
416 * This function is called by garbage collection to determine if commit should
417 * be run. If commit state is @COMMIT_BACKGROUND, which means that the journal
418 * is full enough to start commit, this function returns true. It is not
419 * absolutely necessary to commit yet, but it feels like this should be better
420 * then to keep doing GC. This function returns %1 if GC has to initiate commit
421 * and %0 if not.
422 */
423int ubifs_gc_should_commit(struct ubifs_info *c)
424{
425 int ret = 0;
426
427 spin_lock(&c->cs_lock);
428 if (c->cmt_state == COMMIT_BACKGROUND) {
429 dbg_cmt("commit required now");
430 c->cmt_state = COMMIT_REQUIRED;
431 } else
432 dbg_cmt("commit not requested");
433 if (c->cmt_state == COMMIT_REQUIRED)
434 ret = 1;
435 spin_unlock(&c->cs_lock);
436 return ret;
437}
438
439#ifdef CONFIG_UBIFS_FS_DEBUG
440
441/**
442 * struct idx_node - hold index nodes during index tree traversal.
443 * @list: list
444 * @iip: index in parent (slot number of this indexing node in the parent
445 * indexing node)
446 * @upper_key: all keys in this indexing node have to be less or equivalent to
447 * this key
448 * @idx: index node (8-byte aligned because all node structures must be 8-byte
449 * aligned)
450 */
451struct idx_node {
452 struct list_head list;
453 int iip;
454 union ubifs_key upper_key;
455 struct ubifs_idx_node idx __attribute__((aligned(8)));
456};
457
458/**
459 * dbg_old_index_check_init - get information for the next old index check.
460 * @c: UBIFS file-system description object
461 * @zroot: root of the index
462 *
463 * This function records information about the index that will be needed for the
464 * next old index check i.e. 'dbg_check_old_index()'.
465 *
466 * This function returns %0 on success and a negative error code on failure.
467 */
468int dbg_old_index_check_init(struct ubifs_info *c, struct ubifs_zbranch *zroot)
469{
470 struct ubifs_idx_node *idx;
471 int lnum, offs, len, err = 0;
472
473 c->old_zroot = *zroot;
474
475 lnum = c->old_zroot.lnum;
476 offs = c->old_zroot.offs;
477 len = c->old_zroot.len;
478
479 idx = kmalloc(c->max_idx_node_sz, GFP_NOFS);
480 if (!idx)
481 return -ENOMEM;
482
483 err = ubifs_read_node(c, idx, UBIFS_IDX_NODE, len, lnum, offs);
484 if (err)
485 goto out;
486
487 c->old_zroot_level = le16_to_cpu(idx->level);
488 c->old_zroot_sqnum = le64_to_cpu(idx->ch.sqnum);
489out:
490 kfree(idx);
491 return err;
492}
493
494/**
495 * dbg_check_old_index - check the old copy of the index.
496 * @c: UBIFS file-system description object
497 * @zroot: root of the new index
498 *
499 * In order to be able to recover from an unclean unmount, a complete copy of
500 * the index must exist on flash. This is the "old" index. The commit process
501 * must write the "new" index to flash without overwriting or destroying any
502 * part of the old index. This function is run at commit end in order to check
503 * that the old index does indeed exist completely intact.
504 *
505 * This function returns %0 on success and a negative error code on failure.
506 */
507int dbg_check_old_index(struct ubifs_info *c, struct ubifs_zbranch *zroot)
508{
509 int lnum, offs, len, err = 0, uninitialized_var(last_level), child_cnt;
510 int first = 1, iip;
511 union ubifs_key lower_key, upper_key, l_key, u_key;
512 unsigned long long uninitialized_var(last_sqnum);
513 struct ubifs_idx_node *idx;
514 struct list_head list;
515 struct idx_node *i;
516 size_t sz;
517
518 if (!(ubifs_chk_flags & UBIFS_CHK_OLD_IDX))
519 goto out;
520
521 INIT_LIST_HEAD(&list);
522
523 sz = sizeof(struct idx_node) + ubifs_idx_node_sz(c, c->fanout) -
524 UBIFS_IDX_NODE_SZ;
525
526 /* Start at the old zroot */
527 lnum = c->old_zroot.lnum;
528 offs = c->old_zroot.offs;
529 len = c->old_zroot.len;
530 iip = 0;
531
532 /*
533 * Traverse the index tree preorder depth-first i.e. do a node and then
534 * its subtrees from left to right.
535 */
536 while (1) {
537 struct ubifs_branch *br;
538
539 /* Get the next index node */
540 i = kmalloc(sz, GFP_NOFS);
541 if (!i) {
542 err = -ENOMEM;
543 goto out_free;
544 }
545 i->iip = iip;
546 /* Keep the index nodes on our path in a linked list */
547 list_add_tail(&i->list, &list);
548 /* Read the index node */
549 idx = &i->idx;
550 err = ubifs_read_node(c, idx, UBIFS_IDX_NODE, len, lnum, offs);
551 if (err)
552 goto out_free;
553 /* Validate index node */
554 child_cnt = le16_to_cpu(idx->child_cnt);
555 if (child_cnt < 1 || child_cnt > c->fanout) {
556 err = 1;
557 goto out_dump;
558 }
559 if (first) {
560 first = 0;
561 /* Check root level and sqnum */
562 if (le16_to_cpu(idx->level) != c->old_zroot_level) {
563 err = 2;
564 goto out_dump;
565 }
566 if (le64_to_cpu(idx->ch.sqnum) != c->old_zroot_sqnum) {
567 err = 3;
568 goto out_dump;
569 }
570 /* Set last values as though root had a parent */
571 last_level = le16_to_cpu(idx->level) + 1;
572 last_sqnum = le64_to_cpu(idx->ch.sqnum) + 1;
573 key_read(c, ubifs_idx_key(c, idx), &lower_key);
574 highest_ino_key(c, &upper_key, INUM_WATERMARK);
575 }
576 key_copy(c, &upper_key, &i->upper_key);
577 if (le16_to_cpu(idx->level) != last_level - 1) {
578 err = 3;
579 goto out_dump;
580 }
581 /*
582 * The index is always written bottom up hence a child's sqnum
583 * is always less than the parents.
584 */
585 if (le64_to_cpu(idx->ch.sqnum) >= last_sqnum) {
586 err = 4;
587 goto out_dump;
588 }
589 /* Check key range */
590 key_read(c, ubifs_idx_key(c, idx), &l_key);
591 br = ubifs_idx_branch(c, idx, child_cnt - 1);
592 key_read(c, &br->key, &u_key);
593 if (keys_cmp(c, &lower_key, &l_key) > 0) {
594 err = 5;
595 goto out_dump;
596 }
597 if (keys_cmp(c, &upper_key, &u_key) < 0) {
598 err = 6;
599 goto out_dump;
600 }
601 if (keys_cmp(c, &upper_key, &u_key) == 0)
602 if (!is_hash_key(c, &u_key)) {
603 err = 7;
604 goto out_dump;
605 }
606 /* Go to next index node */
607 if (le16_to_cpu(idx->level) == 0) {
608 /* At the bottom, so go up until can go right */
609 while (1) {
610 /* Drop the bottom of the list */
611 list_del(&i->list);
612 kfree(i);
613 /* No more list means we are done */
614 if (list_empty(&list))
615 goto out;
616 /* Look at the new bottom */
617 i = list_entry(list.prev, struct idx_node,
618 list);
619 idx = &i->idx;
620 /* Can we go right */
621 if (iip + 1 < le16_to_cpu(idx->child_cnt)) {
622 iip = iip + 1;
623 break;
624 } else
625 /* Nope, so go up again */
626 iip = i->iip;
627 }
628 } else
629 /* Go down left */
630 iip = 0;
631 /*
632 * We have the parent in 'idx' and now we set up for reading the
633 * child pointed to by slot 'iip'.
634 */
635 last_level = le16_to_cpu(idx->level);
636 last_sqnum = le64_to_cpu(idx->ch.sqnum);
637 br = ubifs_idx_branch(c, idx, iip);
638 lnum = le32_to_cpu(br->lnum);
639 offs = le32_to_cpu(br->offs);
640 len = le32_to_cpu(br->len);
641 key_read(c, &br->key, &lower_key);
642 if (iip + 1 < le16_to_cpu(idx->child_cnt)) {
643 br = ubifs_idx_branch(c, idx, iip + 1);
644 key_read(c, &br->key, &upper_key);
645 } else
646 key_copy(c, &i->upper_key, &upper_key);
647 }
648out:
649 err = dbg_old_index_check_init(c, zroot);
650 if (err)
651 goto out_free;
652
653 return 0;
654
655out_dump:
656 dbg_err("dumping index node (iip=%d)", i->iip);
657 dbg_dump_node(c, idx);
658 list_del(&i->list);
659 kfree(i);
660 if (!list_empty(&list)) {
661 i = list_entry(list.prev, struct idx_node, list);
662 dbg_err("dumping parent index node");
663 dbg_dump_node(c, &i->idx);
664 }
665out_free:
666 while (!list_empty(&list)) {
667 i = list_entry(list.next, struct idx_node, list);
668 list_del(&i->list);
669 kfree(i);
670 }
671 ubifs_err("failed, error %d", err);
672 if (err > 0)
673 err = -EINVAL;
674 return err;
675}
676
677#endif /* CONFIG_UBIFS_FS_DEBUG */