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1e51764a AB |
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: Artem Bityutskiy (Битюцкий Артём) | |
20 | * Adrian Hunter | |
21 | */ | |
22 | ||
23 | /* | |
24 | * This file is a part of UBIFS journal implementation and contains various | |
25 | * functions which manipulate the log. The log is a fixed area on the flash | |
26 | * which does not contain any data but refers to buds. The log is a part of the | |
27 | * journal. | |
28 | */ | |
29 | ||
30 | #include "ubifs.h" | |
31 | ||
32 | #ifdef CONFIG_UBIFS_FS_DEBUG | |
33 | static int dbg_check_bud_bytes(struct ubifs_info *c); | |
34 | #else | |
35 | #define dbg_check_bud_bytes(c) 0 | |
36 | #endif | |
37 | ||
38 | /** | |
39 | * ubifs_search_bud - search bud LEB. | |
40 | * @c: UBIFS file-system description object | |
41 | * @lnum: logical eraseblock number to search | |
42 | * | |
43 | * This function searches bud LEB @lnum. Returns bud description object in case | |
44 | * of success and %NULL if there is no bud with this LEB number. | |
45 | */ | |
46 | struct ubifs_bud *ubifs_search_bud(struct ubifs_info *c, int lnum) | |
47 | { | |
48 | struct rb_node *p; | |
49 | struct ubifs_bud *bud; | |
50 | ||
51 | spin_lock(&c->buds_lock); | |
52 | p = c->buds.rb_node; | |
53 | while (p) { | |
54 | bud = rb_entry(p, struct ubifs_bud, rb); | |
55 | if (lnum < bud->lnum) | |
56 | p = p->rb_left; | |
57 | else if (lnum > bud->lnum) | |
58 | p = p->rb_right; | |
59 | else { | |
60 | spin_unlock(&c->buds_lock); | |
61 | return bud; | |
62 | } | |
63 | } | |
64 | spin_unlock(&c->buds_lock); | |
65 | return NULL; | |
66 | } | |
67 | ||
68 | /** | |
69 | * ubifs_get_wbuf - get the wbuf associated with a LEB, if there is one. | |
70 | * @c: UBIFS file-system description object | |
71 | * @lnum: logical eraseblock number to search | |
72 | * | |
73 | * This functions returns the wbuf for @lnum or %NULL if there is not one. | |
74 | */ | |
75 | struct ubifs_wbuf *ubifs_get_wbuf(struct ubifs_info *c, int lnum) | |
76 | { | |
77 | struct rb_node *p; | |
78 | struct ubifs_bud *bud; | |
79 | int jhead; | |
80 | ||
81 | if (!c->jheads) | |
82 | return NULL; | |
83 | ||
84 | spin_lock(&c->buds_lock); | |
85 | p = c->buds.rb_node; | |
86 | while (p) { | |
87 | bud = rb_entry(p, struct ubifs_bud, rb); | |
88 | if (lnum < bud->lnum) | |
89 | p = p->rb_left; | |
90 | else if (lnum > bud->lnum) | |
91 | p = p->rb_right; | |
92 | else { | |
93 | jhead = bud->jhead; | |
94 | spin_unlock(&c->buds_lock); | |
95 | return &c->jheads[jhead].wbuf; | |
96 | } | |
97 | } | |
98 | spin_unlock(&c->buds_lock); | |
99 | return NULL; | |
100 | } | |
101 | ||
1e51764a AB |
102 | /** |
103 | * empty_log_bytes - calculate amount of empty space in the log. | |
104 | * @c: UBIFS file-system description object | |
105 | */ | |
106 | static inline long long empty_log_bytes(const struct ubifs_info *c) | |
107 | { | |
108 | long long h, t; | |
109 | ||
110 | h = (long long)c->lhead_lnum * c->leb_size + c->lhead_offs; | |
111 | t = (long long)c->ltail_lnum * c->leb_size; | |
112 | ||
113 | if (h >= t) | |
114 | return c->log_bytes - h + t; | |
115 | else | |
116 | return t - h; | |
117 | } | |
118 | ||
119 | /** | |
120 | * ubifs_add_bud - add bud LEB to the tree of buds and its journal head list. | |
121 | * @c: UBIFS file-system description object | |
122 | * @bud: the bud to add | |
123 | */ | |
124 | void ubifs_add_bud(struct ubifs_info *c, struct ubifs_bud *bud) | |
125 | { | |
126 | struct rb_node **p, *parent = NULL; | |
127 | struct ubifs_bud *b; | |
128 | struct ubifs_jhead *jhead; | |
129 | ||
130 | spin_lock(&c->buds_lock); | |
131 | p = &c->buds.rb_node; | |
132 | while (*p) { | |
133 | parent = *p; | |
134 | b = rb_entry(parent, struct ubifs_bud, rb); | |
135 | ubifs_assert(bud->lnum != b->lnum); | |
136 | if (bud->lnum < b->lnum) | |
137 | p = &(*p)->rb_left; | |
138 | else | |
139 | p = &(*p)->rb_right; | |
140 | } | |
141 | ||
142 | rb_link_node(&bud->rb, parent, p); | |
143 | rb_insert_color(&bud->rb, &c->buds); | |
144 | if (c->jheads) { | |
145 | jhead = &c->jheads[bud->jhead]; | |
146 | list_add_tail(&bud->list, &jhead->buds_list); | |
147 | } else | |
2ef13294 | 148 | ubifs_assert(c->replaying && c->ro_mount); |
1e51764a AB |
149 | |
150 | /* | |
151 | * Note, although this is a new bud, we anyway account this space now, | |
152 | * before any data has been written to it, because this is about to | |
153 | * guarantee fixed mount time, and this bud will anyway be read and | |
154 | * scanned. | |
155 | */ | |
156 | c->bud_bytes += c->leb_size - bud->start; | |
157 | ||
77a7ae58 AB |
158 | dbg_log("LEB %d:%d, jhead %s, bud_bytes %lld", bud->lnum, |
159 | bud->start, dbg_jhead(bud->jhead), c->bud_bytes); | |
1e51764a AB |
160 | spin_unlock(&c->buds_lock); |
161 | } | |
162 | ||
1e51764a AB |
163 | /** |
164 | * ubifs_add_bud_to_log - add a new bud to the log. | |
165 | * @c: UBIFS file-system description object | |
166 | * @jhead: journal head the bud belongs to | |
167 | * @lnum: LEB number of the bud | |
168 | * @offs: starting offset of the bud | |
169 | * | |
170 | * This function writes reference node for the new bud LEB @lnum it to the log, | |
171 | * and adds it to the buds tress. It also makes sure that log size does not | |
172 | * exceed the 'c->max_bud_bytes' limit. Returns zero in case of success, | |
173 | * %-EAGAIN if commit is required, and a negative error codes in case of | |
174 | * failure. | |
175 | */ | |
176 | int ubifs_add_bud_to_log(struct ubifs_info *c, int jhead, int lnum, int offs) | |
177 | { | |
178 | int err; | |
179 | struct ubifs_bud *bud; | |
180 | struct ubifs_ref_node *ref; | |
181 | ||
182 | bud = kmalloc(sizeof(struct ubifs_bud), GFP_NOFS); | |
183 | if (!bud) | |
184 | return -ENOMEM; | |
185 | ref = kzalloc(c->ref_node_alsz, GFP_NOFS); | |
186 | if (!ref) { | |
187 | kfree(bud); | |
188 | return -ENOMEM; | |
189 | } | |
190 | ||
191 | mutex_lock(&c->log_mutex); | |
2ef13294 | 192 | ubifs_assert(!c->ro_media && !c->ro_mount); |
2680d722 | 193 | if (c->ro_error) { |
1e51764a AB |
194 | err = -EROFS; |
195 | goto out_unlock; | |
196 | } | |
197 | ||
198 | /* Make sure we have enough space in the log */ | |
199 | if (empty_log_bytes(c) - c->ref_node_alsz < c->min_log_bytes) { | |
200 | dbg_log("not enough log space - %lld, required %d", | |
201 | empty_log_bytes(c), c->min_log_bytes); | |
202 | ubifs_commit_required(c); | |
203 | err = -EAGAIN; | |
204 | goto out_unlock; | |
205 | } | |
206 | ||
207 | /* | |
7d4e9ccb | 208 | * Make sure the amount of space in buds will not exceed the |
1e51764a AB |
209 | * 'c->max_bud_bytes' limit, because we want to guarantee mount time |
210 | * limits. | |
211 | * | |
212 | * It is not necessary to hold @c->buds_lock when reading @c->bud_bytes | |
213 | * because we are holding @c->log_mutex. All @c->bud_bytes take place | |
214 | * when both @c->log_mutex and @c->bud_bytes are locked. | |
215 | */ | |
216 | if (c->bud_bytes + c->leb_size - offs > c->max_bud_bytes) { | |
217 | dbg_log("bud bytes %lld (%lld max), require commit", | |
218 | c->bud_bytes, c->max_bud_bytes); | |
219 | ubifs_commit_required(c); | |
220 | err = -EAGAIN; | |
221 | goto out_unlock; | |
222 | } | |
223 | ||
224 | /* | |
225 | * If the journal is full enough - start background commit. Note, it is | |
226 | * OK to read 'c->cmt_state' without spinlock because integer reads | |
227 | * are atomic in the kernel. | |
228 | */ | |
229 | if (c->bud_bytes >= c->bg_bud_bytes && | |
230 | c->cmt_state == COMMIT_RESTING) { | |
231 | dbg_log("bud bytes %lld (%lld max), initiate BG commit", | |
232 | c->bud_bytes, c->max_bud_bytes); | |
233 | ubifs_request_bg_commit(c); | |
234 | } | |
235 | ||
236 | bud->lnum = lnum; | |
237 | bud->start = offs; | |
238 | bud->jhead = jhead; | |
239 | ||
240 | ref->ch.node_type = UBIFS_REF_NODE; | |
241 | ref->lnum = cpu_to_le32(bud->lnum); | |
242 | ref->offs = cpu_to_le32(bud->start); | |
243 | ref->jhead = cpu_to_le32(jhead); | |
244 | ||
245 | if (c->lhead_offs > c->leb_size - c->ref_node_alsz) { | |
e11602ea | 246 | c->lhead_lnum = ubifs_next_log_lnum(c, c->lhead_lnum); |
1e51764a AB |
247 | c->lhead_offs = 0; |
248 | } | |
249 | ||
250 | if (c->lhead_offs == 0) { | |
251 | /* Must ensure next log LEB has been unmapped */ | |
252 | err = ubifs_leb_unmap(c, c->lhead_lnum); | |
253 | if (err) | |
254 | goto out_unlock; | |
255 | } | |
256 | ||
257 | if (bud->start == 0) { | |
258 | /* | |
259 | * Before writing the LEB reference which refers an empty LEB | |
260 | * to the log, we have to make sure it is mapped, because | |
261 | * otherwise we'd risk to refer an LEB with garbage in case of | |
262 | * an unclean reboot, because the target LEB might have been | |
263 | * unmapped, but not yet physically erased. | |
264 | */ | |
d3b2578f | 265 | err = ubifs_leb_map(c, bud->lnum, UBI_SHORTTERM); |
1e51764a AB |
266 | if (err) |
267 | goto out_unlock; | |
268 | } | |
269 | ||
270 | dbg_log("write ref LEB %d:%d", | |
271 | c->lhead_lnum, c->lhead_offs); | |
272 | err = ubifs_write_node(c, ref, UBIFS_REF_NODE_SZ, c->lhead_lnum, | |
273 | c->lhead_offs, UBI_SHORTTERM); | |
274 | if (err) | |
275 | goto out_unlock; | |
276 | ||
277 | c->lhead_offs += c->ref_node_alsz; | |
278 | ||
279 | ubifs_add_bud(c, bud); | |
280 | ||
281 | mutex_unlock(&c->log_mutex); | |
282 | kfree(ref); | |
283 | return 0; | |
284 | ||
285 | out_unlock: | |
286 | mutex_unlock(&c->log_mutex); | |
287 | kfree(ref); | |
288 | kfree(bud); | |
289 | return err; | |
290 | } | |
291 | ||
292 | /** | |
293 | * remove_buds - remove used buds. | |
294 | * @c: UBIFS file-system description object | |
295 | * | |
296 | * This function removes use buds from the buds tree. It does not remove the | |
297 | * buds which are pointed to by journal heads. | |
298 | */ | |
299 | static void remove_buds(struct ubifs_info *c) | |
300 | { | |
301 | struct rb_node *p; | |
302 | ||
303 | ubifs_assert(list_empty(&c->old_buds)); | |
304 | c->cmt_bud_bytes = 0; | |
305 | spin_lock(&c->buds_lock); | |
306 | p = rb_first(&c->buds); | |
307 | while (p) { | |
308 | struct rb_node *p1 = p; | |
309 | struct ubifs_bud *bud; | |
310 | struct ubifs_wbuf *wbuf; | |
311 | ||
312 | p = rb_next(p); | |
313 | bud = rb_entry(p1, struct ubifs_bud, rb); | |
314 | wbuf = &c->jheads[bud->jhead].wbuf; | |
315 | ||
316 | if (wbuf->lnum == bud->lnum) { | |
317 | /* | |
318 | * Do not remove buds which are pointed to by journal | |
319 | * heads (non-closed buds). | |
320 | */ | |
321 | c->cmt_bud_bytes += wbuf->offs - bud->start; | |
77a7ae58 | 322 | dbg_log("preserve %d:%d, jhead %s, bud bytes %d, " |
1e51764a | 323 | "cmt_bud_bytes %lld", bud->lnum, bud->start, |
77a7ae58 | 324 | dbg_jhead(bud->jhead), wbuf->offs - bud->start, |
1e51764a AB |
325 | c->cmt_bud_bytes); |
326 | bud->start = wbuf->offs; | |
327 | } else { | |
328 | c->cmt_bud_bytes += c->leb_size - bud->start; | |
77a7ae58 | 329 | dbg_log("remove %d:%d, jhead %s, bud bytes %d, " |
1e51764a | 330 | "cmt_bud_bytes %lld", bud->lnum, bud->start, |
77a7ae58 | 331 | dbg_jhead(bud->jhead), c->leb_size - bud->start, |
1e51764a AB |
332 | c->cmt_bud_bytes); |
333 | rb_erase(p1, &c->buds); | |
1e51764a AB |
334 | /* |
335 | * If the commit does not finish, the recovery will need | |
336 | * to replay the journal, in which case the old buds | |
337 | * must be unchanged. Do not release them until post | |
338 | * commit i.e. do not allow them to be garbage | |
339 | * collected. | |
340 | */ | |
ec32816f | 341 | list_move(&bud->list, &c->old_buds); |
1e51764a AB |
342 | } |
343 | } | |
344 | spin_unlock(&c->buds_lock); | |
345 | } | |
346 | ||
347 | /** | |
348 | * ubifs_log_start_commit - start commit. | |
349 | * @c: UBIFS file-system description object | |
350 | * @ltail_lnum: return new log tail LEB number | |
351 | * | |
352 | * The commit operation starts with writing "commit start" node to the log and | |
353 | * reference nodes for all journal heads which will define new journal after | |
354 | * the commit has been finished. The commit start and reference nodes are | |
355 | * written in one go to the nearest empty log LEB (hence, when commit is | |
356 | * finished UBIFS may safely unmap all the previous log LEBs). This function | |
357 | * returns zero in case of success and a negative error code in case of | |
358 | * failure. | |
359 | */ | |
360 | int ubifs_log_start_commit(struct ubifs_info *c, int *ltail_lnum) | |
361 | { | |
362 | void *buf; | |
363 | struct ubifs_cs_node *cs; | |
364 | struct ubifs_ref_node *ref; | |
365 | int err, i, max_len, len; | |
366 | ||
367 | err = dbg_check_bud_bytes(c); | |
368 | if (err) | |
369 | return err; | |
370 | ||
371 | max_len = UBIFS_CS_NODE_SZ + c->jhead_cnt * UBIFS_REF_NODE_SZ; | |
372 | max_len = ALIGN(max_len, c->min_io_size); | |
373 | buf = cs = kmalloc(max_len, GFP_NOFS); | |
374 | if (!buf) | |
375 | return -ENOMEM; | |
376 | ||
377 | cs->ch.node_type = UBIFS_CS_NODE; | |
014eb04b | 378 | cs->cmt_no = cpu_to_le64(c->cmt_no); |
1e51764a AB |
379 | ubifs_prepare_node(c, cs, UBIFS_CS_NODE_SZ, 0); |
380 | ||
381 | /* | |
382 | * Note, we do not lock 'c->log_mutex' because this is the commit start | |
383 | * phase and we are exclusively using the log. And we do not lock | |
384 | * write-buffer because nobody can write to the file-system at this | |
385 | * phase. | |
386 | */ | |
387 | ||
388 | len = UBIFS_CS_NODE_SZ; | |
389 | for (i = 0; i < c->jhead_cnt; i++) { | |
390 | int lnum = c->jheads[i].wbuf.lnum; | |
391 | int offs = c->jheads[i].wbuf.offs; | |
392 | ||
393 | if (lnum == -1 || offs == c->leb_size) | |
394 | continue; | |
395 | ||
77a7ae58 AB |
396 | dbg_log("add ref to LEB %d:%d for jhead %s", |
397 | lnum, offs, dbg_jhead(i)); | |
1e51764a AB |
398 | ref = buf + len; |
399 | ref->ch.node_type = UBIFS_REF_NODE; | |
400 | ref->lnum = cpu_to_le32(lnum); | |
401 | ref->offs = cpu_to_le32(offs); | |
402 | ref->jhead = cpu_to_le32(i); | |
403 | ||
404 | ubifs_prepare_node(c, ref, UBIFS_REF_NODE_SZ, 0); | |
405 | len += UBIFS_REF_NODE_SZ; | |
406 | } | |
407 | ||
408 | ubifs_pad(c, buf + len, ALIGN(len, c->min_io_size) - len); | |
409 | ||
410 | /* Switch to the next log LEB */ | |
411 | if (c->lhead_offs) { | |
e11602ea | 412 | c->lhead_lnum = ubifs_next_log_lnum(c, c->lhead_lnum); |
1e51764a AB |
413 | c->lhead_offs = 0; |
414 | } | |
415 | ||
416 | if (c->lhead_offs == 0) { | |
417 | /* Must ensure next LEB has been unmapped */ | |
418 | err = ubifs_leb_unmap(c, c->lhead_lnum); | |
419 | if (err) | |
420 | goto out; | |
421 | } | |
422 | ||
423 | len = ALIGN(len, c->min_io_size); | |
424 | dbg_log("writing commit start at LEB %d:0, len %d", c->lhead_lnum, len); | |
425 | err = ubifs_leb_write(c, c->lhead_lnum, cs, 0, len, UBI_SHORTTERM); | |
426 | if (err) | |
427 | goto out; | |
428 | ||
429 | *ltail_lnum = c->lhead_lnum; | |
430 | ||
431 | c->lhead_offs += len; | |
432 | if (c->lhead_offs == c->leb_size) { | |
e11602ea | 433 | c->lhead_lnum = ubifs_next_log_lnum(c, c->lhead_lnum); |
1e51764a AB |
434 | c->lhead_offs = 0; |
435 | } | |
436 | ||
437 | remove_buds(c); | |
438 | ||
439 | /* | |
440 | * We have started the commit and now users may use the rest of the log | |
441 | * for new writes. | |
442 | */ | |
443 | c->min_log_bytes = 0; | |
444 | ||
445 | out: | |
446 | kfree(buf); | |
447 | return err; | |
448 | } | |
449 | ||
450 | /** | |
451 | * ubifs_log_end_commit - end commit. | |
452 | * @c: UBIFS file-system description object | |
453 | * @ltail_lnum: new log tail LEB number | |
454 | * | |
455 | * This function is called on when the commit operation was finished. It | |
456 | * moves log tail to new position and unmaps LEBs which contain obsolete data. | |
457 | * Returns zero in case of success and a negative error code in case of | |
458 | * failure. | |
459 | */ | |
460 | int ubifs_log_end_commit(struct ubifs_info *c, int ltail_lnum) | |
461 | { | |
462 | int err; | |
463 | ||
464 | /* | |
465 | * At this phase we have to lock 'c->log_mutex' because UBIFS allows FS | |
466 | * writes during commit. Its only short "commit" start phase when | |
467 | * writers are blocked. | |
468 | */ | |
469 | mutex_lock(&c->log_mutex); | |
470 | ||
471 | dbg_log("old tail was LEB %d:0, new tail is LEB %d:0", | |
472 | c->ltail_lnum, ltail_lnum); | |
473 | ||
474 | c->ltail_lnum = ltail_lnum; | |
475 | /* | |
476 | * The commit is finished and from now on it must be guaranteed that | |
477 | * there is always enough space for the next commit. | |
478 | */ | |
479 | c->min_log_bytes = c->leb_size; | |
480 | ||
481 | spin_lock(&c->buds_lock); | |
482 | c->bud_bytes -= c->cmt_bud_bytes; | |
483 | spin_unlock(&c->buds_lock); | |
484 | ||
485 | err = dbg_check_bud_bytes(c); | |
486 | ||
487 | mutex_unlock(&c->log_mutex); | |
488 | return err; | |
489 | } | |
490 | ||
491 | /** | |
492 | * ubifs_log_post_commit - things to do after commit is completed. | |
493 | * @c: UBIFS file-system description object | |
494 | * @old_ltail_lnum: old log tail LEB number | |
495 | * | |
496 | * Release buds only after commit is completed, because they must be unchanged | |
497 | * if recovery is needed. | |
498 | * | |
499 | * Unmap log LEBs only after commit is completed, because they may be needed for | |
500 | * recovery. | |
501 | * | |
502 | * This function returns %0 on success and a negative error code on failure. | |
503 | */ | |
504 | int ubifs_log_post_commit(struct ubifs_info *c, int old_ltail_lnum) | |
505 | { | |
506 | int lnum, err = 0; | |
507 | ||
508 | while (!list_empty(&c->old_buds)) { | |
509 | struct ubifs_bud *bud; | |
510 | ||
511 | bud = list_entry(c->old_buds.next, struct ubifs_bud, list); | |
512 | err = ubifs_return_leb(c, bud->lnum); | |
513 | if (err) | |
514 | return err; | |
515 | list_del(&bud->list); | |
516 | kfree(bud); | |
517 | } | |
518 | mutex_lock(&c->log_mutex); | |
519 | for (lnum = old_ltail_lnum; lnum != c->ltail_lnum; | |
e11602ea | 520 | lnum = ubifs_next_log_lnum(c, lnum)) { |
1e51764a AB |
521 | dbg_log("unmap log LEB %d", lnum); |
522 | err = ubifs_leb_unmap(c, lnum); | |
523 | if (err) | |
524 | goto out; | |
525 | } | |
526 | out: | |
527 | mutex_unlock(&c->log_mutex); | |
528 | return err; | |
529 | } | |
530 | ||
531 | /** | |
532 | * struct done_ref - references that have been done. | |
533 | * @rb: rb-tree node | |
534 | * @lnum: LEB number | |
535 | */ | |
536 | struct done_ref { | |
537 | struct rb_node rb; | |
538 | int lnum; | |
539 | }; | |
540 | ||
541 | /** | |
542 | * done_already - determine if a reference has been done already. | |
543 | * @done_tree: rb-tree to store references that have been done | |
544 | * @lnum: LEB number of reference | |
545 | * | |
546 | * This function returns %1 if the reference has been done, %0 if not, otherwise | |
547 | * a negative error code is returned. | |
548 | */ | |
549 | static int done_already(struct rb_root *done_tree, int lnum) | |
550 | { | |
551 | struct rb_node **p = &done_tree->rb_node, *parent = NULL; | |
552 | struct done_ref *dr; | |
553 | ||
554 | while (*p) { | |
555 | parent = *p; | |
556 | dr = rb_entry(parent, struct done_ref, rb); | |
557 | if (lnum < dr->lnum) | |
558 | p = &(*p)->rb_left; | |
559 | else if (lnum > dr->lnum) | |
560 | p = &(*p)->rb_right; | |
561 | else | |
562 | return 1; | |
563 | } | |
564 | ||
565 | dr = kzalloc(sizeof(struct done_ref), GFP_NOFS); | |
566 | if (!dr) | |
567 | return -ENOMEM; | |
568 | ||
569 | dr->lnum = lnum; | |
570 | ||
571 | rb_link_node(&dr->rb, parent, p); | |
572 | rb_insert_color(&dr->rb, done_tree); | |
573 | ||
574 | return 0; | |
575 | } | |
576 | ||
577 | /** | |
578 | * destroy_done_tree - destroy the done tree. | |
579 | * @done_tree: done tree to destroy | |
580 | */ | |
581 | static void destroy_done_tree(struct rb_root *done_tree) | |
582 | { | |
583 | struct rb_node *this = done_tree->rb_node; | |
584 | struct done_ref *dr; | |
585 | ||
586 | while (this) { | |
587 | if (this->rb_left) { | |
588 | this = this->rb_left; | |
589 | continue; | |
590 | } else if (this->rb_right) { | |
591 | this = this->rb_right; | |
592 | continue; | |
593 | } | |
594 | dr = rb_entry(this, struct done_ref, rb); | |
595 | this = rb_parent(this); | |
596 | if (this) { | |
597 | if (this->rb_left == &dr->rb) | |
598 | this->rb_left = NULL; | |
599 | else | |
600 | this->rb_right = NULL; | |
601 | } | |
602 | kfree(dr); | |
603 | } | |
604 | } | |
605 | ||
606 | /** | |
607 | * add_node - add a node to the consolidated log. | |
608 | * @c: UBIFS file-system description object | |
609 | * @buf: buffer to which to add | |
610 | * @lnum: LEB number to which to write is passed and returned here | |
611 | * @offs: offset to where to write is passed and returned here | |
612 | * @node: node to add | |
613 | * | |
614 | * This function returns %0 on success and a negative error code on failure. | |
615 | */ | |
616 | static int add_node(struct ubifs_info *c, void *buf, int *lnum, int *offs, | |
617 | void *node) | |
618 | { | |
619 | struct ubifs_ch *ch = node; | |
620 | int len = le32_to_cpu(ch->len), remains = c->leb_size - *offs; | |
621 | ||
622 | if (len > remains) { | |
623 | int sz = ALIGN(*offs, c->min_io_size), err; | |
624 | ||
625 | ubifs_pad(c, buf + *offs, sz - *offs); | |
626 | err = ubifs_leb_change(c, *lnum, buf, sz, UBI_SHORTTERM); | |
627 | if (err) | |
628 | return err; | |
e11602ea | 629 | *lnum = ubifs_next_log_lnum(c, *lnum); |
1e51764a AB |
630 | *offs = 0; |
631 | } | |
632 | memcpy(buf + *offs, node, len); | |
633 | *offs += ALIGN(len, 8); | |
634 | return 0; | |
635 | } | |
636 | ||
637 | /** | |
638 | * ubifs_consolidate_log - consolidate the log. | |
639 | * @c: UBIFS file-system description object | |
640 | * | |
641 | * Repeated failed commits could cause the log to be full, but at least 1 LEB is | |
642 | * needed for commit. This function rewrites the reference nodes in the log | |
643 | * omitting duplicates, and failed CS nodes, and leaving no gaps. | |
644 | * | |
645 | * This function returns %0 on success and a negative error code on failure. | |
646 | */ | |
647 | int ubifs_consolidate_log(struct ubifs_info *c) | |
648 | { | |
649 | struct ubifs_scan_leb *sleb; | |
650 | struct ubifs_scan_node *snod; | |
651 | struct rb_root done_tree = RB_ROOT; | |
652 | int lnum, err, first = 1, write_lnum, offs = 0; | |
653 | void *buf; | |
654 | ||
655 | dbg_rcvry("log tail LEB %d, log head LEB %d", c->ltail_lnum, | |
656 | c->lhead_lnum); | |
657 | buf = vmalloc(c->leb_size); | |
658 | if (!buf) | |
659 | return -ENOMEM; | |
660 | lnum = c->ltail_lnum; | |
661 | write_lnum = lnum; | |
662 | while (1) { | |
348709ba | 663 | sleb = ubifs_scan(c, lnum, 0, c->sbuf, 0); |
1e51764a AB |
664 | if (IS_ERR(sleb)) { |
665 | err = PTR_ERR(sleb); | |
666 | goto out_free; | |
667 | } | |
668 | list_for_each_entry(snod, &sleb->nodes, list) { | |
669 | switch (snod->type) { | |
670 | case UBIFS_REF_NODE: { | |
671 | struct ubifs_ref_node *ref = snod->node; | |
672 | int ref_lnum = le32_to_cpu(ref->lnum); | |
673 | ||
674 | err = done_already(&done_tree, ref_lnum); | |
675 | if (err < 0) | |
676 | goto out_scan; | |
677 | if (err != 1) { | |
678 | err = add_node(c, buf, &write_lnum, | |
679 | &offs, snod->node); | |
680 | if (err) | |
681 | goto out_scan; | |
682 | } | |
683 | break; | |
684 | } | |
685 | case UBIFS_CS_NODE: | |
686 | if (!first) | |
687 | break; | |
688 | err = add_node(c, buf, &write_lnum, &offs, | |
689 | snod->node); | |
690 | if (err) | |
691 | goto out_scan; | |
692 | first = 0; | |
693 | break; | |
694 | } | |
695 | } | |
696 | ubifs_scan_destroy(sleb); | |
697 | if (lnum == c->lhead_lnum) | |
698 | break; | |
e11602ea | 699 | lnum = ubifs_next_log_lnum(c, lnum); |
1e51764a AB |
700 | } |
701 | if (offs) { | |
702 | int sz = ALIGN(offs, c->min_io_size); | |
703 | ||
704 | ubifs_pad(c, buf + offs, sz - offs); | |
705 | err = ubifs_leb_change(c, write_lnum, buf, sz, UBI_SHORTTERM); | |
706 | if (err) | |
707 | goto out_free; | |
708 | offs = ALIGN(offs, c->min_io_size); | |
709 | } | |
710 | destroy_done_tree(&done_tree); | |
711 | vfree(buf); | |
712 | if (write_lnum == c->lhead_lnum) { | |
713 | ubifs_err("log is too full"); | |
714 | return -EINVAL; | |
715 | } | |
716 | /* Unmap remaining LEBs */ | |
717 | lnum = write_lnum; | |
718 | do { | |
e11602ea | 719 | lnum = ubifs_next_log_lnum(c, lnum); |
1e51764a AB |
720 | err = ubifs_leb_unmap(c, lnum); |
721 | if (err) | |
722 | return err; | |
723 | } while (lnum != c->lhead_lnum); | |
724 | c->lhead_lnum = write_lnum; | |
725 | c->lhead_offs = offs; | |
726 | dbg_rcvry("new log head at %d:%d", c->lhead_lnum, c->lhead_offs); | |
727 | return 0; | |
728 | ||
729 | out_scan: | |
730 | ubifs_scan_destroy(sleb); | |
731 | out_free: | |
732 | destroy_done_tree(&done_tree); | |
733 | vfree(buf); | |
734 | return err; | |
735 | } | |
736 | ||
737 | #ifdef CONFIG_UBIFS_FS_DEBUG | |
738 | ||
739 | /** | |
740 | * dbg_check_bud_bytes - make sure bud bytes calculation are all right. | |
741 | * @c: UBIFS file-system description object | |
742 | * | |
743 | * This function makes sure the amount of flash space used by closed buds | |
744 | * ('c->bud_bytes' is correct). Returns zero in case of success and %-EINVAL in | |
745 | * case of failure. | |
746 | */ | |
747 | static int dbg_check_bud_bytes(struct ubifs_info *c) | |
748 | { | |
749 | int i, err = 0; | |
750 | struct ubifs_bud *bud; | |
751 | long long bud_bytes = 0; | |
752 | ||
2b1844a8 | 753 | if (!dbg_is_chk_gen(c)) |
1e51764a AB |
754 | return 0; |
755 | ||
756 | spin_lock(&c->buds_lock); | |
757 | for (i = 0; i < c->jhead_cnt; i++) | |
758 | list_for_each_entry(bud, &c->jheads[i].buds_list, list) | |
759 | bud_bytes += c->leb_size - bud->start; | |
760 | ||
761 | if (c->bud_bytes != bud_bytes) { | |
762 | ubifs_err("bad bud_bytes %lld, calculated %lld", | |
763 | c->bud_bytes, bud_bytes); | |
764 | err = -EINVAL; | |
765 | } | |
766 | spin_unlock(&c->buds_lock); | |
767 | ||
768 | return err; | |
769 | } | |
770 | ||
771 | #endif /* CONFIG_UBIFS_FS_DEBUG */ |