blob: 3ca4540130b54a6e0b1328616cc54d1e65604c11 [file] [log] [blame]
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001/*
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 contains journal replay code. It runs when the file-system is being
25 * mounted and requires no locking.
26 *
27 * The larger is the journal, the longer it takes to scan it, so the longer it
28 * takes to mount UBIFS. This is why the journal has limited size which may be
29 * changed depending on the system requirements. But a larger journal gives
30 * faster I/O speed because it writes the index less frequently. So this is a
31 * trade-off. Also, the journal is indexed by the in-memory index (TNC), so the
32 * larger is the journal, the more memory its index may consume.
33 */
34
35#include "ubifs.h"
Artem Bityutskiydebf12d2011-05-15 12:05:54 +030036#include <linux/list_sort.h>
Artem Bityutskiy1e517642008-07-14 19:08:37 +030037
Artem Bityutskiy1e517642008-07-14 19:08:37 +030038/**
Artem Bityutskiydebf12d2011-05-15 12:05:54 +030039 * struct replay_entry - replay list entry.
Artem Bityutskiy1e517642008-07-14 19:08:37 +030040 * @lnum: logical eraseblock number of the node
41 * @offs: node offset
42 * @len: node length
Artem Bityutskiy074bcb92011-05-15 11:37:17 +030043 * @deletion: non-zero if this entry corresponds to a node deletion
Artem Bityutskiy1e517642008-07-14 19:08:37 +030044 * @sqnum: node sequence number
Artem Bityutskiydebf12d2011-05-15 12:05:54 +030045 * @list: links the replay list
Artem Bityutskiy1e517642008-07-14 19:08:37 +030046 * @key: node key
47 * @nm: directory entry name
48 * @old_size: truncation old size
49 * @new_size: truncation new size
Artem Bityutskiy1e517642008-07-14 19:08:37 +030050 *
Artem Bityutskiydebf12d2011-05-15 12:05:54 +030051 * The replay process first scans all buds and builds the replay list, then
52 * sorts the replay list in nodes sequence number order, and then inserts all
53 * the replay entries to the TNC.
Artem Bityutskiy1e517642008-07-14 19:08:37 +030054 */
55struct replay_entry {
56 int lnum;
57 int offs;
58 int len;
Artem Bityutskiy074bcb92011-05-15 11:37:17 +030059 unsigned int deletion:1;
Artem Bityutskiy1e517642008-07-14 19:08:37 +030060 unsigned long long sqnum;
Artem Bityutskiydebf12d2011-05-15 12:05:54 +030061 struct list_head list;
Artem Bityutskiy1e517642008-07-14 19:08:37 +030062 union ubifs_key key;
63 union {
64 struct qstr nm;
65 struct {
66 loff_t old_size;
67 loff_t new_size;
68 };
Artem Bityutskiy1e517642008-07-14 19:08:37 +030069 };
70};
71
72/**
73 * struct bud_entry - entry in the list of buds to replay.
74 * @list: next bud in the list
75 * @bud: bud description object
Artem Bityutskiy1e517642008-07-14 19:08:37 +030076 * @sqnum: reference node sequence number
Artem Bityutskiyaf1dd412011-05-15 11:14:57 +030077 * @free: free bytes in the bud
78 * @dirty: dirty bytes in the bud
Artem Bityutskiy1e517642008-07-14 19:08:37 +030079 */
80struct bud_entry {
81 struct list_head list;
82 struct ubifs_bud *bud;
Artem Bityutskiy1e517642008-07-14 19:08:37 +030083 unsigned long long sqnum;
Artem Bityutskiyaf1dd412011-05-15 11:14:57 +030084 int free;
85 int dirty;
Artem Bityutskiy1e517642008-07-14 19:08:37 +030086};
87
88/**
89 * set_bud_lprops - set free and dirty space used by a bud.
90 * @c: UBIFS file-system description object
Artem Bityutskiy074bcb92011-05-15 11:37:17 +030091 * @b: bud entry which describes the bud
92 *
93 * This function makes sure the LEB properties of bud @b are set correctly
94 * after the replay. Returns zero in case of success and a negative error code
95 * in case of failure.
Artem Bityutskiy1e517642008-07-14 19:08:37 +030096 */
Artem Bityutskiy074bcb92011-05-15 11:37:17 +030097static int set_bud_lprops(struct ubifs_info *c, struct bud_entry *b)
Artem Bityutskiy1e517642008-07-14 19:08:37 +030098{
99 const struct ubifs_lprops *lp;
100 int err = 0, dirty;
101
102 ubifs_get_lprops(c);
103
Artem Bityutskiy074bcb92011-05-15 11:37:17 +0300104 lp = ubifs_lpt_lookup_dirty(c, b->bud->lnum);
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300105 if (IS_ERR(lp)) {
106 err = PTR_ERR(lp);
107 goto out;
108 }
109
110 dirty = lp->dirty;
Artem Bityutskiy074bcb92011-05-15 11:37:17 +0300111 if (b->bud->start == 0 && (lp->free != c->leb_size || lp->dirty != 0)) {
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300112 /*
113 * The LEB was added to the journal with a starting offset of
114 * zero which means the LEB must have been empty. The LEB
Artem Bityutskiy074bcb92011-05-15 11:37:17 +0300115 * property values should be @lp->free == @c->leb_size and
116 * @lp->dirty == 0, but that is not the case. The reason is that
Artem Bityutskiy7a9c3e32011-05-13 13:02:00 +0300117 * the LEB had been garbage collected before it became the bud,
118 * and there was not commit inbetween. The garbage collector
119 * resets the free and dirty space without recording it
120 * anywhere except lprops, so if there was no commit then
121 * lprops does not have that information.
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300122 *
123 * We do not need to adjust free space because the scan has told
124 * us the exact value which is recorded in the replay entry as
Artem Bityutskiy074bcb92011-05-15 11:37:17 +0300125 * @b->free.
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300126 *
127 * However we do need to subtract from the dirty space the
128 * amount of space that the garbage collector reclaimed, which
129 * is the whole LEB minus the amount of space that was free.
130 */
Artem Bityutskiy074bcb92011-05-15 11:37:17 +0300131 dbg_mnt("bud LEB %d was GC'd (%d free, %d dirty)", b->bud->lnum,
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300132 lp->free, lp->dirty);
Artem Bityutskiy074bcb92011-05-15 11:37:17 +0300133 dbg_gc("bud LEB %d was GC'd (%d free, %d dirty)", b->bud->lnum,
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300134 lp->free, lp->dirty);
135 dirty -= c->leb_size - lp->free;
136 /*
137 * If the replay order was perfect the dirty space would now be
Artem Bityutskiy7d4e9cc2009-03-20 19:11:12 +0200138 * zero. The order is not perfect because the journal heads
Artem Bityutskiy6edbfaf2008-12-30 20:06:49 +0200139 * race with each other. This is not a problem but is does mean
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300140 * that the dirty space may temporarily exceed c->leb_size
141 * during the replay.
142 */
143 if (dirty != 0)
Artem Bityutskiy3668b702012-08-27 16:56:58 +0300144 dbg_mnt("LEB %d lp: %d free %d dirty replay: %d free %d dirty",
Artem Bityutskiy79fda512012-08-27 13:34:09 +0300145 b->bud->lnum, lp->free, lp->dirty, b->free,
146 b->dirty);
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300147 }
Artem Bityutskiy074bcb92011-05-15 11:37:17 +0300148 lp = ubifs_change_lp(c, lp, b->free, dirty + b->dirty,
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300149 lp->flags | LPROPS_TAKEN, 0);
150 if (IS_ERR(lp)) {
151 err = PTR_ERR(lp);
152 goto out;
153 }
Artem Bityutskiy52c6e6f2011-04-25 18:46:31 +0300154
155 /* Make sure the journal head points to the latest bud */
Artem Bityutskiy074bcb92011-05-15 11:37:17 +0300156 err = ubifs_wbuf_seek_nolock(&c->jheads[b->bud->jhead].wbuf,
Richard Weinbergerb36a2612012-05-14 17:55:51 +0200157 b->bud->lnum, c->leb_size - b->free);
Artem Bityutskiy52c6e6f2011-04-25 18:46:31 +0300158
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300159out:
160 ubifs_release_lprops(c);
161 return err;
162}
163
164/**
Artem Bityutskiy074bcb92011-05-15 11:37:17 +0300165 * set_buds_lprops - set free and dirty space for all replayed buds.
166 * @c: UBIFS file-system description object
167 *
168 * This function sets LEB properties for all replayed buds. Returns zero in
169 * case of success and a negative error code in case of failure.
170 */
171static int set_buds_lprops(struct ubifs_info *c)
172{
173 struct bud_entry *b;
174 int err;
175
176 list_for_each_entry(b, &c->replay_buds, list) {
177 err = set_bud_lprops(c, b);
178 if (err)
179 return err;
180 }
181
182 return 0;
183}
184
185/**
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300186 * trun_remove_range - apply a replay entry for a truncation to the TNC.
187 * @c: UBIFS file-system description object
188 * @r: replay entry of truncation
189 */
190static int trun_remove_range(struct ubifs_info *c, struct replay_entry *r)
191{
192 unsigned min_blk, max_blk;
193 union ubifs_key min_key, max_key;
194 ino_t ino;
195
196 min_blk = r->new_size / UBIFS_BLOCK_SIZE;
197 if (r->new_size & (UBIFS_BLOCK_SIZE - 1))
198 min_blk += 1;
199
200 max_blk = r->old_size / UBIFS_BLOCK_SIZE;
201 if ((r->old_size & (UBIFS_BLOCK_SIZE - 1)) == 0)
202 max_blk -= 1;
203
204 ino = key_inum(c, &r->key);
205
206 data_key_init(c, &min_key, ino, min_blk);
207 data_key_init(c, &max_key, ino, max_blk);
208
209 return ubifs_tnc_remove_range(c, &min_key, &max_key);
210}
211
212/**
213 * apply_replay_entry - apply a replay entry to the TNC.
214 * @c: UBIFS file-system description object
215 * @r: replay entry to apply
216 *
217 * Apply a replay entry to the TNC.
218 */
219static int apply_replay_entry(struct ubifs_info *c, struct replay_entry *r)
220{
Artem Bityutskiy074bcb92011-05-15 11:37:17 +0300221 int err;
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300222
Artem Bityutskiy515315a2012-01-13 12:33:53 +0200223 dbg_mntk(&r->key, "LEB %d:%d len %d deletion %d sqnum %llu key ",
224 r->lnum, r->offs, r->len, r->deletion, r->sqnum);
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300225
226 /* Set c->replay_sqnum to help deal with dangling branches. */
227 c->replay_sqnum = r->sqnum;
228
Artem Bityutskiy074bcb92011-05-15 11:37:17 +0300229 if (is_hash_key(c, &r->key)) {
230 if (r->deletion)
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300231 err = ubifs_tnc_remove_nm(c, &r->key, &r->nm);
232 else
233 err = ubifs_tnc_add_nm(c, &r->key, r->lnum, r->offs,
234 r->len, &r->nm);
235 } else {
Artem Bityutskiy074bcb92011-05-15 11:37:17 +0300236 if (r->deletion)
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300237 switch (key_type(c, &r->key)) {
238 case UBIFS_INO_KEY:
239 {
240 ino_t inum = key_inum(c, &r->key);
241
242 err = ubifs_tnc_remove_ino(c, inum);
243 break;
244 }
245 case UBIFS_TRUN_KEY:
246 err = trun_remove_range(c, r);
247 break;
248 default:
249 err = ubifs_tnc_remove(c, &r->key);
250 break;
251 }
252 else
253 err = ubifs_tnc_add(c, &r->key, r->lnum, r->offs,
254 r->len);
255 if (err)
256 return err;
257
258 if (c->need_recovery)
Artem Bityutskiy074bcb92011-05-15 11:37:17 +0300259 err = ubifs_recover_size_accum(c, &r->key, r->deletion,
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300260 r->new_size);
261 }
262
263 return err;
264}
265
266/**
Artem Bityutskiydebf12d2011-05-15 12:05:54 +0300267 * replay_entries_cmp - compare 2 replay entries.
268 * @priv: UBIFS file-system description object
269 * @a: first replay entry
270 * @a: second replay entry
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300271 *
Artem Bityutskiydebf12d2011-05-15 12:05:54 +0300272 * This is a comparios function for 'list_sort()' which compares 2 replay
273 * entries @a and @b by comparing their sequence numer. Returns %1 if @a has
274 * greater sequence number and %-1 otherwise.
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300275 */
Artem Bityutskiydebf12d2011-05-15 12:05:54 +0300276static int replay_entries_cmp(void *priv, struct list_head *a,
277 struct list_head *b)
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300278{
Artem Bityutskiydebf12d2011-05-15 12:05:54 +0300279 struct replay_entry *ra, *rb;
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300280
Artem Bityutskiydebf12d2011-05-15 12:05:54 +0300281 cond_resched();
282 if (a == b)
283 return 0;
284
285 ra = list_entry(a, struct replay_entry, list);
286 rb = list_entry(b, struct replay_entry, list);
287 ubifs_assert(ra->sqnum != rb->sqnum);
288 if (ra->sqnum > rb->sqnum)
289 return 1;
290 return -1;
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300291}
292
293/**
Artem Bityutskiydebf12d2011-05-15 12:05:54 +0300294 * apply_replay_list - apply the replay list to the TNC.
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300295 * @c: UBIFS file-system description object
296 *
Artem Bityutskiydebf12d2011-05-15 12:05:54 +0300297 * Apply all entries in the replay list to the TNC. Returns zero in case of
298 * success and a negative error code in case of failure.
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300299 */
Artem Bityutskiydebf12d2011-05-15 12:05:54 +0300300static int apply_replay_list(struct ubifs_info *c)
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300301{
Artem Bityutskiydebf12d2011-05-15 12:05:54 +0300302 struct replay_entry *r;
303 int err;
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300304
Artem Bityutskiydebf12d2011-05-15 12:05:54 +0300305 list_sort(c, &c->replay_list, &replay_entries_cmp);
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300306
Artem Bityutskiydebf12d2011-05-15 12:05:54 +0300307 list_for_each_entry(r, &c->replay_list, list) {
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300308 cond_resched();
309
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300310 err = apply_replay_entry(c, r);
311 if (err)
312 return err;
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300313 }
Artem Bityutskiydebf12d2011-05-15 12:05:54 +0300314
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300315 return 0;
316}
317
318/**
Artem Bityutskiydebf12d2011-05-15 12:05:54 +0300319 * destroy_replay_list - destroy the replay.
320 * @c: UBIFS file-system description object
321 *
322 * Destroy the replay list.
323 */
324static void destroy_replay_list(struct ubifs_info *c)
325{
326 struct replay_entry *r, *tmp;
327
328 list_for_each_entry_safe(r, tmp, &c->replay_list, list) {
329 if (is_hash_key(c, &r->key))
330 kfree(r->nm.name);
331 list_del(&r->list);
332 kfree(r);
333 }
334}
335
336/**
337 * insert_node - insert a node to the replay list
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300338 * @c: UBIFS file-system description object
339 * @lnum: node logical eraseblock number
340 * @offs: node offset
341 * @len: node length
342 * @key: node key
343 * @sqnum: sequence number
344 * @deletion: non-zero if this is a deletion
345 * @used: number of bytes in use in a LEB
346 * @old_size: truncation old size
347 * @new_size: truncation new size
348 *
Artem Bityutskiydebf12d2011-05-15 12:05:54 +0300349 * This function inserts a scanned non-direntry node to the replay list. The
350 * replay list contains @struct replay_entry elements, and we sort this list in
351 * sequence number order before applying it. The replay list is applied at the
352 * very end of the replay process. Since the list is sorted in sequence number
353 * order, the older modifications are applied first. This function returns zero
354 * in case of success and a negative error code in case of failure.
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300355 */
356static int insert_node(struct ubifs_info *c, int lnum, int offs, int len,
357 union ubifs_key *key, unsigned long long sqnum,
358 int deletion, int *used, loff_t old_size,
359 loff_t new_size)
360{
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300361 struct replay_entry *r;
362
Artem Bityutskiy515315a2012-01-13 12:33:53 +0200363 dbg_mntk(key, "add LEB %d:%d, key ", lnum, offs);
Artem Bityutskiydebf12d2011-05-15 12:05:54 +0300364
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300365 if (key_inum(c, key) >= c->highest_inum)
366 c->highest_inum = key_inum(c, key);
367
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300368 r = kzalloc(sizeof(struct replay_entry), GFP_KERNEL);
369 if (!r)
370 return -ENOMEM;
371
372 if (!deletion)
373 *used += ALIGN(len, 8);
374 r->lnum = lnum;
375 r->offs = offs;
376 r->len = len;
Artem Bityutskiy074bcb92011-05-15 11:37:17 +0300377 r->deletion = !!deletion;
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300378 r->sqnum = sqnum;
Artem Bityutskiy074bcb92011-05-15 11:37:17 +0300379 key_copy(c, key, &r->key);
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300380 r->old_size = old_size;
381 r->new_size = new_size;
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300382
Artem Bityutskiydebf12d2011-05-15 12:05:54 +0300383 list_add_tail(&r->list, &c->replay_list);
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300384 return 0;
385}
386
387/**
Artem Bityutskiydebf12d2011-05-15 12:05:54 +0300388 * insert_dent - insert a directory entry node into the replay list.
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300389 * @c: UBIFS file-system description object
390 * @lnum: node logical eraseblock number
391 * @offs: node offset
392 * @len: node length
393 * @key: node key
394 * @name: directory entry name
395 * @nlen: directory entry name length
396 * @sqnum: sequence number
397 * @deletion: non-zero if this is a deletion
398 * @used: number of bytes in use in a LEB
399 *
Artem Bityutskiydebf12d2011-05-15 12:05:54 +0300400 * This function inserts a scanned directory entry node or an extended
401 * attribute entry to the replay list. Returns zero in case of success and a
402 * negative error code in case of failure.
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300403 */
404static int insert_dent(struct ubifs_info *c, int lnum, int offs, int len,
405 union ubifs_key *key, const char *name, int nlen,
406 unsigned long long sqnum, int deletion, int *used)
407{
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300408 struct replay_entry *r;
409 char *nbuf;
410
Artem Bityutskiy515315a2012-01-13 12:33:53 +0200411 dbg_mntk(key, "add LEB %d:%d, key ", lnum, offs);
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300412 if (key_inum(c, key) >= c->highest_inum)
413 c->highest_inum = key_inum(c, key);
414
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300415 r = kzalloc(sizeof(struct replay_entry), GFP_KERNEL);
416 if (!r)
417 return -ENOMEM;
Artem Bityutskiydebf12d2011-05-15 12:05:54 +0300418
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300419 nbuf = kmalloc(nlen + 1, GFP_KERNEL);
420 if (!nbuf) {
421 kfree(r);
422 return -ENOMEM;
423 }
424
425 if (!deletion)
426 *used += ALIGN(len, 8);
427 r->lnum = lnum;
428 r->offs = offs;
429 r->len = len;
Artem Bityutskiy074bcb92011-05-15 11:37:17 +0300430 r->deletion = !!deletion;
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300431 r->sqnum = sqnum;
Artem Bityutskiy074bcb92011-05-15 11:37:17 +0300432 key_copy(c, key, &r->key);
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300433 r->nm.len = nlen;
434 memcpy(nbuf, name, nlen);
435 nbuf[nlen] = '\0';
436 r->nm.name = nbuf;
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300437
Artem Bityutskiydebf12d2011-05-15 12:05:54 +0300438 list_add_tail(&r->list, &c->replay_list);
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300439 return 0;
440}
441
442/**
443 * ubifs_validate_entry - validate directory or extended attribute entry node.
444 * @c: UBIFS file-system description object
445 * @dent: the node to validate
446 *
447 * This function validates directory or extended attribute entry node @dent.
448 * Returns zero if the node is all right and a %-EINVAL if not.
449 */
450int ubifs_validate_entry(struct ubifs_info *c,
451 const struct ubifs_dent_node *dent)
452{
453 int key_type = key_type_flash(c, dent->key);
454 int nlen = le16_to_cpu(dent->nlen);
455
456 if (le32_to_cpu(dent->ch.len) != nlen + UBIFS_DENT_NODE_SZ + 1 ||
457 dent->type >= UBIFS_ITYPES_CNT ||
458 nlen > UBIFS_MAX_NLEN || dent->name[nlen] != 0 ||
459 strnlen(dent->name, nlen) != nlen ||
460 le64_to_cpu(dent->inum) > MAX_INUM) {
Sheng Yong235c3622015-03-20 10:39:42 +0000461 ubifs_err(c, "bad %s node", key_type == UBIFS_DENT_KEY ?
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300462 "directory entry" : "extended attribute entry");
463 return -EINVAL;
464 }
465
466 if (key_type != UBIFS_DENT_KEY && key_type != UBIFS_XENT_KEY) {
Sheng Yong235c3622015-03-20 10:39:42 +0000467 ubifs_err(c, "bad key type %d", key_type);
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300468 return -EINVAL;
469 }
470
471 return 0;
472}
473
474/**
Artem Bityutskiy91c66082011-05-15 13:11:00 +0300475 * is_last_bud - check if the bud is the last in the journal head.
476 * @c: UBIFS file-system description object
477 * @bud: bud description object
478 *
479 * This function checks if bud @bud is the last bud in its journal head. This
480 * information is then used by 'replay_bud()' to decide whether the bud can
481 * have corruptions or not. Indeed, only last buds can be corrupted by power
482 * cuts. Returns %1 if this is the last bud, and %0 if not.
483 */
484static int is_last_bud(struct ubifs_info *c, struct ubifs_bud *bud)
485{
486 struct ubifs_jhead *jh = &c->jheads[bud->jhead];
487 struct ubifs_bud *next;
488 uint32_t data;
489 int err;
490
491 if (list_is_last(&bud->list, &jh->buds_list))
492 return 1;
493
494 /*
495 * The following is a quirk to make sure we work correctly with UBIFS
496 * images used with older UBIFS.
497 *
498 * Normally, the last bud will be the last in the journal head's list
499 * of bud. However, there is one exception if the UBIFS image belongs
500 * to older UBIFS. This is fairly unlikely: one would need to use old
501 * UBIFS, then have a power cut exactly at the right point, and then
502 * try to mount this image with new UBIFS.
503 *
504 * The exception is: it is possible to have 2 buds A and B, A goes
505 * before B, and B is the last, bud B is contains no data, and bud A is
506 * corrupted at the end. The reason is that in older versions when the
507 * journal code switched the next bud (from A to B), it first added a
508 * log reference node for the new bud (B), and only after this it
509 * synchronized the write-buffer of current bud (A). But later this was
510 * changed and UBIFS started to always synchronize the write-buffer of
511 * the bud (A) before writing the log reference for the new bud (B).
512 *
513 * But because older UBIFS always synchronized A's write-buffer before
514 * writing to B, we can recognize this exceptional situation but
515 * checking the contents of bud B - if it is empty, then A can be
516 * treated as the last and we can recover it.
517 *
518 * TODO: remove this piece of code in a couple of years (today it is
519 * 16.05.2011).
520 */
521 next = list_entry(bud->list.next, struct ubifs_bud, list);
522 if (!list_is_last(&next->list, &jh->buds_list))
523 return 0;
524
Artem Bityutskiyd3048202011-06-03 14:03:25 +0300525 err = ubifs_leb_read(c, next->lnum, (char *)&data, next->start, 4, 1);
Artem Bityutskiy91c66082011-05-15 13:11:00 +0300526 if (err)
527 return 0;
528
529 return data == 0xFFFFFFFF;
530}
531
532/**
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300533 * replay_bud - replay a bud logical eraseblock.
534 * @c: UBIFS file-system description object
Artem Bityutskiye76a4522011-05-15 12:34:29 +0300535 * @b: bud entry which describes the bud
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300536 *
Artem Bityutskiye76a4522011-05-15 12:34:29 +0300537 * This function replays bud @bud, recovers it if needed, and adds all nodes
538 * from this bud to the replay list. Returns zero in case of success and a
539 * negative error code in case of failure.
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300540 */
Artem Bityutskiye76a4522011-05-15 12:34:29 +0300541static int replay_bud(struct ubifs_info *c, struct bud_entry *b)
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300542{
Artem Bityutskiy91c66082011-05-15 13:11:00 +0300543 int is_last = is_last_bud(c, b->bud);
Artem Bityutskiye76a4522011-05-15 12:34:29 +0300544 int err = 0, used = 0, lnum = b->bud->lnum, offs = b->bud->start;
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300545 struct ubifs_scan_leb *sleb;
546 struct ubifs_scan_node *snod;
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300547
Artem Bityutskiy91c66082011-05-15 13:11:00 +0300548 dbg_mnt("replay bud LEB %d, head %d, offs %d, is_last %d",
549 lnum, b->bud->jhead, offs, is_last);
Artem Bityutskiye76a4522011-05-15 12:34:29 +0300550
Artem Bityutskiy91c66082011-05-15 13:11:00 +0300551 if (c->need_recovery && is_last)
552 /*
553 * Recover only last LEBs in the journal heads, because power
554 * cuts may cause corruptions only in these LEBs, because only
555 * these LEBs could possibly be written to at the power cut
556 * time.
557 */
Artem Bityutskiyefcfde52011-05-26 08:36:52 +0300558 sleb = ubifs_recover_leb(c, lnum, offs, c->sbuf, b->bud->jhead);
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300559 else
Artem Bityutskiy348709b2009-08-25 15:00:55 +0300560 sleb = ubifs_scan(c, lnum, offs, c->sbuf, 0);
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300561 if (IS_ERR(sleb))
562 return PTR_ERR(sleb);
563
564 /*
565 * The bud does not have to start from offset zero - the beginning of
566 * the 'lnum' LEB may contain previously committed data. One of the
567 * things we have to do in replay is to correctly update lprops with
568 * newer information about this LEB.
569 *
570 * At this point lprops thinks that this LEB has 'c->leb_size - offs'
571 * bytes of free space because it only contain information about
572 * committed data.
573 *
574 * But we know that real amount of free space is 'c->leb_size -
575 * sleb->endpt', and the space in the 'lnum' LEB between 'offs' and
576 * 'sleb->endpt' is used by bud data. We have to correctly calculate
577 * how much of these data are dirty and update lprops with this
578 * information.
579 *
580 * The dirt in that LEB region is comprised of padding nodes, deletion
581 * nodes, truncation nodes and nodes which are obsoleted by subsequent
582 * nodes in this LEB. So instead of calculating clean space, we
583 * calculate used space ('used' variable).
584 */
585
586 list_for_each_entry(snod, &sleb->nodes, list) {
587 int deletion = 0;
588
589 cond_resched();
590
591 if (snod->sqnum >= SQNUM_WATERMARK) {
Sheng Yong235c3622015-03-20 10:39:42 +0000592 ubifs_err(c, "file system's life ended");
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300593 goto out_dump;
594 }
595
596 if (snod->sqnum > c->max_sqnum)
597 c->max_sqnum = snod->sqnum;
598
599 switch (snod->type) {
600 case UBIFS_INO_NODE:
601 {
602 struct ubifs_ino_node *ino = snod->node;
603 loff_t new_size = le64_to_cpu(ino->size);
604
605 if (le32_to_cpu(ino->nlink) == 0)
606 deletion = 1;
607 err = insert_node(c, lnum, snod->offs, snod->len,
608 &snod->key, snod->sqnum, deletion,
609 &used, 0, new_size);
610 break;
611 }
612 case UBIFS_DATA_NODE:
613 {
614 struct ubifs_data_node *dn = snod->node;
615 loff_t new_size = le32_to_cpu(dn->size) +
616 key_block(c, &snod->key) *
617 UBIFS_BLOCK_SIZE;
618
619 err = insert_node(c, lnum, snod->offs, snod->len,
620 &snod->key, snod->sqnum, deletion,
621 &used, 0, new_size);
622 break;
623 }
624 case UBIFS_DENT_NODE:
625 case UBIFS_XENT_NODE:
626 {
627 struct ubifs_dent_node *dent = snod->node;
628
629 err = ubifs_validate_entry(c, dent);
630 if (err)
631 goto out_dump;
632
633 err = insert_dent(c, lnum, snod->offs, snod->len,
634 &snod->key, dent->name,
635 le16_to_cpu(dent->nlen), snod->sqnum,
636 !le64_to_cpu(dent->inum), &used);
637 break;
638 }
639 case UBIFS_TRUN_NODE:
640 {
641 struct ubifs_trun_node *trun = snod->node;
642 loff_t old_size = le64_to_cpu(trun->old_size);
643 loff_t new_size = le64_to_cpu(trun->new_size);
644 union ubifs_key key;
645
646 /* Validate truncation node */
647 if (old_size < 0 || old_size > c->max_inode_sz ||
648 new_size < 0 || new_size > c->max_inode_sz ||
649 old_size <= new_size) {
Sheng Yong235c3622015-03-20 10:39:42 +0000650 ubifs_err(c, "bad truncation node");
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300651 goto out_dump;
652 }
653
654 /*
655 * Create a fake truncation key just to use the same
656 * functions which expect nodes to have keys.
657 */
658 trun_key_init(c, &key, le32_to_cpu(trun->inum));
659 err = insert_node(c, lnum, snod->offs, snod->len,
660 &key, snod->sqnum, 1, &used,
661 old_size, new_size);
662 break;
663 }
664 default:
Sheng Yong235c3622015-03-20 10:39:42 +0000665 ubifs_err(c, "unexpected node type %d in bud LEB %d:%d",
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300666 snod->type, lnum, snod->offs);
667 err = -EINVAL;
668 goto out_dump;
669 }
670 if (err)
671 goto out;
672 }
673
Artem Bityutskiyc49139d2011-05-15 12:40:46 +0300674 ubifs_assert(ubifs_search_bud(c, lnum));
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300675 ubifs_assert(sleb->endpt - offs >= used);
676 ubifs_assert(sleb->endpt % c->min_io_size == 0);
677
Artem Bityutskiye76a4522011-05-15 12:34:29 +0300678 b->dirty = sleb->endpt - offs - used;
679 b->free = c->leb_size - sleb->endpt;
Artem Bityutskiy79fda512012-08-27 13:34:09 +0300680 dbg_mnt("bud LEB %d replied: dirty %d, free %d",
681 lnum, b->dirty, b->free);
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300682
683out:
684 ubifs_scan_destroy(sleb);
685 return err;
686
687out_dump:
Sheng Yong235c3622015-03-20 10:39:42 +0000688 ubifs_err(c, "bad node is at LEB %d:%d", lnum, snod->offs);
Artem Bityutskiyedf6be22012-05-16 19:15:56 +0300689 ubifs_dump_node(c, snod->node);
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300690 ubifs_scan_destroy(sleb);
691 return -EINVAL;
692}
693
694/**
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300695 * replay_buds - replay all buds.
696 * @c: UBIFS file-system description object
697 *
698 * This function returns zero in case of success and a negative error code in
699 * case of failure.
700 */
701static int replay_buds(struct ubifs_info *c)
702{
703 struct bud_entry *b;
Artem Bityutskiy074bcb92011-05-15 11:37:17 +0300704 int err;
Artem Bityutskiy7703f092011-05-13 16:02:19 +0300705 unsigned long long prev_sqnum = 0;
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300706
707 list_for_each_entry(b, &c->replay_buds, list) {
Artem Bityutskiye76a4522011-05-15 12:34:29 +0300708 err = replay_bud(c, b);
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300709 if (err)
710 return err;
Artem Bityutskiy7703f092011-05-13 16:02:19 +0300711
712 ubifs_assert(b->sqnum > prev_sqnum);
713 prev_sqnum = b->sqnum;
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300714 }
715
716 return 0;
717}
718
719/**
720 * destroy_bud_list - destroy the list of buds to replay.
721 * @c: UBIFS file-system description object
722 */
723static void destroy_bud_list(struct ubifs_info *c)
724{
725 struct bud_entry *b;
726
727 while (!list_empty(&c->replay_buds)) {
728 b = list_entry(c->replay_buds.next, struct bud_entry, list);
729 list_del(&b->list);
730 kfree(b);
731 }
732}
733
734/**
735 * add_replay_bud - add a bud to the list of buds to replay.
736 * @c: UBIFS file-system description object
737 * @lnum: bud logical eraseblock number to replay
738 * @offs: bud start offset
739 * @jhead: journal head to which this bud belongs
740 * @sqnum: reference node sequence number
741 *
742 * This function returns zero in case of success and a negative error code in
743 * case of failure.
744 */
745static int add_replay_bud(struct ubifs_info *c, int lnum, int offs, int jhead,
746 unsigned long long sqnum)
747{
748 struct ubifs_bud *bud;
749 struct bud_entry *b;
750
751 dbg_mnt("add replay bud LEB %d:%d, head %d", lnum, offs, jhead);
752
753 bud = kmalloc(sizeof(struct ubifs_bud), GFP_KERNEL);
754 if (!bud)
755 return -ENOMEM;
756
757 b = kmalloc(sizeof(struct bud_entry), GFP_KERNEL);
758 if (!b) {
759 kfree(bud);
760 return -ENOMEM;
761 }
762
763 bud->lnum = lnum;
764 bud->start = offs;
765 bud->jhead = jhead;
766 ubifs_add_bud(c, bud);
767
768 b->bud = bud;
769 b->sqnum = sqnum;
770 list_add_tail(&b->list, &c->replay_buds);
771
772 return 0;
773}
774
775/**
776 * validate_ref - validate a reference node.
777 * @c: UBIFS file-system description object
778 * @ref: the reference node to validate
779 * @ref_lnum: LEB number of the reference node
780 * @ref_offs: reference node offset
781 *
782 * This function returns %1 if a bud reference already exists for the LEB. %0 is
783 * returned if the reference node is new, otherwise %-EINVAL is returned if
784 * validation failed.
785 */
786static int validate_ref(struct ubifs_info *c, const struct ubifs_ref_node *ref)
787{
788 struct ubifs_bud *bud;
789 int lnum = le32_to_cpu(ref->lnum);
790 unsigned int offs = le32_to_cpu(ref->offs);
791 unsigned int jhead = le32_to_cpu(ref->jhead);
792
793 /*
794 * ref->offs may point to the end of LEB when the journal head points
795 * to the end of LEB and we write reference node for it during commit.
796 * So this is why we require 'offs > c->leb_size'.
797 */
798 if (jhead >= c->jhead_cnt || lnum >= c->leb_cnt ||
799 lnum < c->main_first || offs > c->leb_size ||
800 offs & (c->min_io_size - 1))
801 return -EINVAL;
802
803 /* Make sure we have not already looked at this bud */
804 bud = ubifs_search_bud(c, lnum);
805 if (bud) {
806 if (bud->jhead == jhead && bud->start <= offs)
807 return 1;
Sheng Yong235c3622015-03-20 10:39:42 +0000808 ubifs_err(c, "bud at LEB %d:%d was already referred", lnum, offs);
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300809 return -EINVAL;
810 }
811
812 return 0;
813}
814
815/**
816 * replay_log_leb - replay a log logical eraseblock.
817 * @c: UBIFS file-system description object
818 * @lnum: log logical eraseblock to replay
819 * @offs: offset to start replaying from
820 * @sbuf: scan buffer
821 *
822 * This function replays a log LEB and returns zero in case of success, %1 if
823 * this is the last LEB in the log, and a negative error code in case of
824 * failure.
825 */
826static int replay_log_leb(struct ubifs_info *c, int lnum, int offs, void *sbuf)
827{
828 int err;
829 struct ubifs_scan_leb *sleb;
830 struct ubifs_scan_node *snod;
831 const struct ubifs_cs_node *node;
832
833 dbg_mnt("replay log LEB %d:%d", lnum, offs);
Artem Bityutskiy348709b2009-08-25 15:00:55 +0300834 sleb = ubifs_scan(c, lnum, offs, sbuf, c->need_recovery);
835 if (IS_ERR(sleb)) {
Artem Bityutskiyed43f2f2009-06-29 17:59:23 +0300836 if (PTR_ERR(sleb) != -EUCLEAN || !c->need_recovery)
837 return PTR_ERR(sleb);
Artem Bityutskiy7d08ae32010-10-17 15:50:19 +0300838 /*
839 * Note, the below function will recover this log LEB only if
840 * it is the last, because unclean reboots can possibly corrupt
841 * only the tail of the log.
842 */
Artem Bityutskiyed43f2f2009-06-29 17:59:23 +0300843 sleb = ubifs_recover_log_leb(c, lnum, offs, sbuf);
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300844 if (IS_ERR(sleb))
845 return PTR_ERR(sleb);
846 }
847
848 if (sleb->nodes_cnt == 0) {
849 err = 1;
850 goto out;
851 }
852
853 node = sleb->buf;
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300854 snod = list_entry(sleb->nodes.next, struct ubifs_scan_node, list);
855 if (c->cs_sqnum == 0) {
856 /*
857 * This is the first log LEB we are looking at, make sure that
858 * the first node is a commit start node. Also record its
859 * sequence number so that UBIFS can determine where the log
860 * ends, because all nodes which were have higher sequence
861 * numbers.
862 */
863 if (snod->type != UBIFS_CS_NODE) {
Sheng Yong235c3622015-03-20 10:39:42 +0000864 ubifs_err(c, "first log node at LEB %d:%d is not CS node",
Artem Bityutskiya6aae4d2012-05-16 20:11:23 +0300865 lnum, offs);
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300866 goto out_dump;
867 }
868 if (le64_to_cpu(node->cmt_no) != c->cmt_no) {
Sheng Yong235c3622015-03-20 10:39:42 +0000869 ubifs_err(c, "first CS node at LEB %d:%d has wrong commit number %llu expected %llu",
Artem Bityutskiya6aae4d2012-05-16 20:11:23 +0300870 lnum, offs,
871 (unsigned long long)le64_to_cpu(node->cmt_no),
872 c->cmt_no);
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300873 goto out_dump;
874 }
875
876 c->cs_sqnum = le64_to_cpu(node->ch.sqnum);
877 dbg_mnt("commit start sqnum %llu", c->cs_sqnum);
878 }
879
880 if (snod->sqnum < c->cs_sqnum) {
881 /*
882 * This means that we reached end of log and now
883 * look to the older log data, which was already
884 * committed but the eraseblock was not erased (UBIFS
Artem Bityutskiy6edbfaf2008-12-30 20:06:49 +0200885 * only un-maps it). So this basically means we have to
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300886 * exit with "end of log" code.
887 */
888 err = 1;
889 goto out;
890 }
891
892 /* Make sure the first node sits at offset zero of the LEB */
893 if (snod->offs != 0) {
Sheng Yong235c3622015-03-20 10:39:42 +0000894 ubifs_err(c, "first node is not at zero offset");
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300895 goto out_dump;
896 }
897
898 list_for_each_entry(snod, &sleb->nodes, list) {
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300899 cond_resched();
900
901 if (snod->sqnum >= SQNUM_WATERMARK) {
Sheng Yong235c3622015-03-20 10:39:42 +0000902 ubifs_err(c, "file system's life ended");
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300903 goto out_dump;
904 }
905
906 if (snod->sqnum < c->cs_sqnum) {
Sheng Yong235c3622015-03-20 10:39:42 +0000907 ubifs_err(c, "bad sqnum %llu, commit sqnum %llu",
Artem Bityutskiya6aae4d2012-05-16 20:11:23 +0300908 snod->sqnum, c->cs_sqnum);
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300909 goto out_dump;
910 }
911
912 if (snod->sqnum > c->max_sqnum)
913 c->max_sqnum = snod->sqnum;
914
915 switch (snod->type) {
916 case UBIFS_REF_NODE: {
917 const struct ubifs_ref_node *ref = snod->node;
918
919 err = validate_ref(c, ref);
920 if (err == 1)
921 break; /* Already have this bud */
922 if (err)
923 goto out_dump;
924
925 err = add_replay_bud(c, le32_to_cpu(ref->lnum),
926 le32_to_cpu(ref->offs),
927 le32_to_cpu(ref->jhead),
928 snod->sqnum);
929 if (err)
930 goto out;
931
932 break;
933 }
934 case UBIFS_CS_NODE:
935 /* Make sure it sits at the beginning of LEB */
936 if (snod->offs != 0) {
Sheng Yong235c3622015-03-20 10:39:42 +0000937 ubifs_err(c, "unexpected node in log");
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300938 goto out_dump;
939 }
940 break;
941 default:
Sheng Yong235c3622015-03-20 10:39:42 +0000942 ubifs_err(c, "unexpected node in log");
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300943 goto out_dump;
944 }
945 }
946
947 if (sleb->endpt || c->lhead_offs >= c->leb_size) {
948 c->lhead_lnum = lnum;
949 c->lhead_offs = sleb->endpt;
950 }
951
952 err = !sleb->endpt;
953out:
954 ubifs_scan_destroy(sleb);
955 return err;
956
957out_dump:
Sheng Yong235c3622015-03-20 10:39:42 +0000958 ubifs_err(c, "log error detected while replaying the log at LEB %d:%d",
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300959 lnum, offs + snod->offs);
Artem Bityutskiyedf6be22012-05-16 19:15:56 +0300960 ubifs_dump_node(c, snod->node);
Artem Bityutskiy1e517642008-07-14 19:08:37 +0300961 ubifs_scan_destroy(sleb);
962 return -EINVAL;
963}
964
965/**
966 * take_ihead - update the status of the index head in lprops to 'taken'.
967 * @c: UBIFS file-system description object
968 *
969 * This function returns the amount of free space in the index head LEB or a
970 * negative error code.
971 */
972static int take_ihead(struct ubifs_info *c)
973{
974 const struct ubifs_lprops *lp;
975 int err, free;
976
977 ubifs_get_lprops(c);
978
979 lp = ubifs_lpt_lookup_dirty(c, c->ihead_lnum);
980 if (IS_ERR(lp)) {
981 err = PTR_ERR(lp);
982 goto out;
983 }
984
985 free = lp->free;
986
987 lp = ubifs_change_lp(c, lp, LPROPS_NC, LPROPS_NC,
988 lp->flags | LPROPS_TAKEN, 0);
989 if (IS_ERR(lp)) {
990 err = PTR_ERR(lp);
991 goto out;
992 }
993
994 err = free;
995out:
996 ubifs_release_lprops(c);
997 return err;
998}
999
1000/**
1001 * ubifs_replay_journal - replay journal.
1002 * @c: UBIFS file-system description object
1003 *
1004 * This function scans the journal, replays and cleans it up. It makes sure all
1005 * memory data structures related to uncommitted journal are built (dirty TNC
1006 * tree, tree of buds, modified lprops, etc).
1007 */
1008int ubifs_replay_journal(struct ubifs_info *c)
1009{
Artem Bityutskiyd51f17ea2012-07-14 20:52:58 +03001010 int err, lnum, free;
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001011
1012 BUILD_BUG_ON(UBIFS_TRUN_KEY > 5);
1013
1014 /* Update the status of the index head in lprops to 'taken' */
1015 free = take_ihead(c);
1016 if (free < 0)
1017 return free; /* Error code */
1018
1019 if (c->ihead_offs != c->leb_size - free) {
Sheng Yong235c3622015-03-20 10:39:42 +00001020 ubifs_err(c, "bad index head LEB %d:%d", c->ihead_lnum,
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001021 c->ihead_offs);
1022 return -EINVAL;
1023 }
1024
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001025 dbg_mnt("start replaying the journal");
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001026 c->replaying = 1;
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001027 lnum = c->ltail_lnum = c->lhead_lnum;
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001028
Artem Bityutskiyd51f17ea2012-07-14 20:52:58 +03001029 do {
1030 err = replay_log_leb(c, lnum, 0, c->sbuf);
hujianyang88cff0f2015-02-10 11:28:57 +08001031 if (err == 1) {
1032 if (lnum != c->lhead_lnum)
1033 /* We hit the end of the log */
1034 break;
1035
1036 /*
1037 * The head of the log must always start with the
1038 * "commit start" node on a properly formatted UBIFS.
1039 * But we found no nodes at all, which means that
1040 * someting went wrong and we cannot proceed mounting
1041 * the file-system.
1042 */
Sheng Yong235c3622015-03-20 10:39:42 +00001043 ubifs_err(c, "no UBIFS nodes found at the log head LEB %d:%d, possibly corrupted",
hujianyang88cff0f2015-02-10 11:28:57 +08001044 lnum, 0);
1045 err = -EINVAL;
1046 }
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001047 if (err)
1048 goto out;
Artem Bityutskiyd51f17ea2012-07-14 20:52:58 +03001049 lnum = ubifs_next_log_lnum(c, lnum);
Artem Bityutskiyc212f402012-08-21 13:45:35 +03001050 } while (lnum != c->ltail_lnum);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001051
1052 err = replay_buds(c);
1053 if (err)
1054 goto out;
1055
Artem Bityutskiydebf12d2011-05-15 12:05:54 +03001056 err = apply_replay_list(c);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001057 if (err)
1058 goto out;
1059
Artem Bityutskiy074bcb92011-05-15 11:37:17 +03001060 err = set_buds_lprops(c);
1061 if (err)
1062 goto out;
1063
Artem Bityutskiy6edbfaf2008-12-30 20:06:49 +02001064 /*
Artem Bityutskiyb1375452011-03-29 18:04:05 +03001065 * UBIFS budgeting calculations use @c->bi.uncommitted_idx variable
1066 * to roughly estimate index growth. Things like @c->bi.min_idx_lebs
Artem Bityutskiy6edbfaf2008-12-30 20:06:49 +02001067 * depend on it. This means we have to initialize it to make sure
1068 * budgeting works properly.
1069 */
Artem Bityutskiyb1375452011-03-29 18:04:05 +03001070 c->bi.uncommitted_idx = atomic_long_read(&c->dirty_zn_cnt);
1071 c->bi.uncommitted_idx *= c->max_idx_node_sz;
Artem Bityutskiy6edbfaf2008-12-30 20:06:49 +02001072
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001073 ubifs_assert(c->bud_bytes <= c->max_bud_bytes || c->need_recovery);
Artem Bityutskiy79fda512012-08-27 13:34:09 +03001074 dbg_mnt("finished, log head LEB %d:%d, max_sqnum %llu, highest_inum %lu",
1075 c->lhead_lnum, c->lhead_offs, c->max_sqnum,
Artem Bityutskiye84461a2008-10-29 12:08:43 +02001076 (unsigned long)c->highest_inum);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001077out:
Artem Bityutskiydebf12d2011-05-15 12:05:54 +03001078 destroy_replay_list(c);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001079 destroy_bud_list(c);
Artem Bityutskiy1e517642008-07-14 19:08:37 +03001080 c->replaying = 0;
1081 return err;
1082}