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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: Adrian Hunter | |
20 | * Artem Bityutskiy (Битюцкий Артём) | |
21 | */ | |
22 | ||
23 | /* | |
24 | * This file implements commit-related functionality of the LEB properties | |
25 | * subsystem. | |
26 | */ | |
27 | ||
28 | #include <linux/crc16.h> | |
29 | #include "ubifs.h" | |
30 | ||
31 | /** | |
32 | * first_dirty_cnode - find first dirty cnode. | |
33 | * @c: UBIFS file-system description object | |
34 | * @nnode: nnode at which to start | |
35 | * | |
36 | * This function returns the first dirty cnode or %NULL if there is not one. | |
37 | */ | |
38 | static struct ubifs_cnode *first_dirty_cnode(struct ubifs_nnode *nnode) | |
39 | { | |
40 | ubifs_assert(nnode); | |
41 | while (1) { | |
42 | int i, cont = 0; | |
43 | ||
44 | for (i = 0; i < UBIFS_LPT_FANOUT; i++) { | |
45 | struct ubifs_cnode *cnode; | |
46 | ||
47 | cnode = nnode->nbranch[i].cnode; | |
48 | if (cnode && | |
49 | test_bit(DIRTY_CNODE, &cnode->flags)) { | |
50 | if (cnode->level == 0) | |
51 | return cnode; | |
52 | nnode = (struct ubifs_nnode *)cnode; | |
53 | cont = 1; | |
54 | break; | |
55 | } | |
56 | } | |
57 | if (!cont) | |
58 | return (struct ubifs_cnode *)nnode; | |
59 | } | |
60 | } | |
61 | ||
62 | /** | |
63 | * next_dirty_cnode - find next dirty cnode. | |
64 | * @cnode: cnode from which to begin searching | |
65 | * | |
66 | * This function returns the next dirty cnode or %NULL if there is not one. | |
67 | */ | |
68 | static struct ubifs_cnode *next_dirty_cnode(struct ubifs_cnode *cnode) | |
69 | { | |
70 | struct ubifs_nnode *nnode; | |
71 | int i; | |
72 | ||
73 | ubifs_assert(cnode); | |
74 | nnode = cnode->parent; | |
75 | if (!nnode) | |
76 | return NULL; | |
77 | for (i = cnode->iip + 1; i < UBIFS_LPT_FANOUT; i++) { | |
78 | cnode = nnode->nbranch[i].cnode; | |
79 | if (cnode && test_bit(DIRTY_CNODE, &cnode->flags)) { | |
80 | if (cnode->level == 0) | |
81 | return cnode; /* cnode is a pnode */ | |
82 | /* cnode is a nnode */ | |
83 | return first_dirty_cnode((struct ubifs_nnode *)cnode); | |
84 | } | |
85 | } | |
86 | return (struct ubifs_cnode *)nnode; | |
87 | } | |
88 | ||
89 | /** | |
90 | * get_cnodes_to_commit - create list of dirty cnodes to commit. | |
91 | * @c: UBIFS file-system description object | |
92 | * | |
93 | * This function returns the number of cnodes to commit. | |
94 | */ | |
95 | static int get_cnodes_to_commit(struct ubifs_info *c) | |
96 | { | |
97 | struct ubifs_cnode *cnode, *cnext; | |
98 | int cnt = 0; | |
99 | ||
100 | if (!c->nroot) | |
101 | return 0; | |
102 | ||
103 | if (!test_bit(DIRTY_CNODE, &c->nroot->flags)) | |
104 | return 0; | |
105 | ||
106 | c->lpt_cnext = first_dirty_cnode(c->nroot); | |
107 | cnode = c->lpt_cnext; | |
108 | if (!cnode) | |
109 | return 0; | |
110 | cnt += 1; | |
111 | while (1) { | |
112 | ubifs_assert(!test_bit(COW_ZNODE, &cnode->flags)); | |
113 | __set_bit(COW_ZNODE, &cnode->flags); | |
114 | cnext = next_dirty_cnode(cnode); | |
115 | if (!cnext) { | |
116 | cnode->cnext = c->lpt_cnext; | |
117 | break; | |
118 | } | |
119 | cnode->cnext = cnext; | |
120 | cnode = cnext; | |
121 | cnt += 1; | |
122 | } | |
123 | dbg_cmt("committing %d cnodes", cnt); | |
124 | dbg_lp("committing %d cnodes", cnt); | |
125 | ubifs_assert(cnt == c->dirty_nn_cnt + c->dirty_pn_cnt); | |
126 | return cnt; | |
127 | } | |
128 | ||
129 | /** | |
130 | * upd_ltab - update LPT LEB properties. | |
131 | * @c: UBIFS file-system description object | |
132 | * @lnum: LEB number | |
133 | * @free: amount of free space | |
134 | * @dirty: amount of dirty space to add | |
135 | */ | |
136 | static void upd_ltab(struct ubifs_info *c, int lnum, int free, int dirty) | |
137 | { | |
138 | dbg_lp("LEB %d free %d dirty %d to %d +%d", | |
139 | lnum, c->ltab[lnum - c->lpt_first].free, | |
140 | c->ltab[lnum - c->lpt_first].dirty, free, dirty); | |
141 | ubifs_assert(lnum >= c->lpt_first && lnum <= c->lpt_last); | |
142 | c->ltab[lnum - c->lpt_first].free = free; | |
143 | c->ltab[lnum - c->lpt_first].dirty += dirty; | |
144 | } | |
145 | ||
146 | /** | |
147 | * alloc_lpt_leb - allocate an LPT LEB that is empty. | |
148 | * @c: UBIFS file-system description object | |
149 | * @lnum: LEB number is passed and returned here | |
150 | * | |
151 | * This function finds the next empty LEB in the ltab starting from @lnum. If a | |
152 | * an empty LEB is found it is returned in @lnum and the function returns %0. | |
153 | * Otherwise the function returns -ENOSPC. Note however, that LPT is designed | |
154 | * never to run out of space. | |
155 | */ | |
156 | static int alloc_lpt_leb(struct ubifs_info *c, int *lnum) | |
157 | { | |
158 | int i, n; | |
159 | ||
160 | n = *lnum - c->lpt_first + 1; | |
161 | for (i = n; i < c->lpt_lebs; i++) { | |
162 | if (c->ltab[i].tgc || c->ltab[i].cmt) | |
163 | continue; | |
164 | if (c->ltab[i].free == c->leb_size) { | |
165 | c->ltab[i].cmt = 1; | |
166 | *lnum = i + c->lpt_first; | |
167 | return 0; | |
168 | } | |
169 | } | |
170 | ||
171 | for (i = 0; i < n; i++) { | |
172 | if (c->ltab[i].tgc || c->ltab[i].cmt) | |
173 | continue; | |
174 | if (c->ltab[i].free == c->leb_size) { | |
175 | c->ltab[i].cmt = 1; | |
176 | *lnum = i + c->lpt_first; | |
177 | return 0; | |
178 | } | |
179 | } | |
1e51764a AB |
180 | return -ENOSPC; |
181 | } | |
182 | ||
183 | /** | |
184 | * layout_cnodes - layout cnodes for commit. | |
185 | * @c: UBIFS file-system description object | |
186 | * | |
187 | * This function returns %0 on success and a negative error code on failure. | |
188 | */ | |
189 | static int layout_cnodes(struct ubifs_info *c) | |
190 | { | |
191 | int lnum, offs, len, alen, done_lsave, done_ltab, err; | |
192 | struct ubifs_cnode *cnode; | |
193 | ||
73944a6d AH |
194 | err = dbg_chk_lpt_sz(c, 0, 0); |
195 | if (err) | |
196 | return err; | |
1e51764a AB |
197 | cnode = c->lpt_cnext; |
198 | if (!cnode) | |
199 | return 0; | |
200 | lnum = c->nhead_lnum; | |
201 | offs = c->nhead_offs; | |
202 | /* Try to place lsave and ltab nicely */ | |
203 | done_lsave = !c->big_lpt; | |
204 | done_ltab = 0; | |
205 | if (!done_lsave && offs + c->lsave_sz <= c->leb_size) { | |
206 | done_lsave = 1; | |
207 | c->lsave_lnum = lnum; | |
208 | c->lsave_offs = offs; | |
209 | offs += c->lsave_sz; | |
73944a6d | 210 | dbg_chk_lpt_sz(c, 1, c->lsave_sz); |
1e51764a AB |
211 | } |
212 | ||
213 | if (offs + c->ltab_sz <= c->leb_size) { | |
214 | done_ltab = 1; | |
215 | c->ltab_lnum = lnum; | |
216 | c->ltab_offs = offs; | |
217 | offs += c->ltab_sz; | |
73944a6d | 218 | dbg_chk_lpt_sz(c, 1, c->ltab_sz); |
1e51764a AB |
219 | } |
220 | ||
221 | do { | |
222 | if (cnode->level) { | |
223 | len = c->nnode_sz; | |
224 | c->dirty_nn_cnt -= 1; | |
225 | } else { | |
226 | len = c->pnode_sz; | |
227 | c->dirty_pn_cnt -= 1; | |
228 | } | |
229 | while (offs + len > c->leb_size) { | |
230 | alen = ALIGN(offs, c->min_io_size); | |
231 | upd_ltab(c, lnum, c->leb_size - alen, alen - offs); | |
73944a6d | 232 | dbg_chk_lpt_sz(c, 2, alen - offs); |
1e51764a AB |
233 | err = alloc_lpt_leb(c, &lnum); |
234 | if (err) | |
73944a6d | 235 | goto no_space; |
1e51764a AB |
236 | offs = 0; |
237 | ubifs_assert(lnum >= c->lpt_first && | |
238 | lnum <= c->lpt_last); | |
239 | /* Try to place lsave and ltab nicely */ | |
240 | if (!done_lsave) { | |
241 | done_lsave = 1; | |
242 | c->lsave_lnum = lnum; | |
243 | c->lsave_offs = offs; | |
244 | offs += c->lsave_sz; | |
73944a6d | 245 | dbg_chk_lpt_sz(c, 1, c->lsave_sz); |
1e51764a AB |
246 | continue; |
247 | } | |
248 | if (!done_ltab) { | |
249 | done_ltab = 1; | |
250 | c->ltab_lnum = lnum; | |
251 | c->ltab_offs = offs; | |
252 | offs += c->ltab_sz; | |
73944a6d | 253 | dbg_chk_lpt_sz(c, 1, c->ltab_sz); |
1e51764a AB |
254 | continue; |
255 | } | |
256 | break; | |
257 | } | |
258 | if (cnode->parent) { | |
259 | cnode->parent->nbranch[cnode->iip].lnum = lnum; | |
260 | cnode->parent->nbranch[cnode->iip].offs = offs; | |
261 | } else { | |
262 | c->lpt_lnum = lnum; | |
263 | c->lpt_offs = offs; | |
264 | } | |
265 | offs += len; | |
73944a6d | 266 | dbg_chk_lpt_sz(c, 1, len); |
1e51764a AB |
267 | cnode = cnode->cnext; |
268 | } while (cnode && cnode != c->lpt_cnext); | |
269 | ||
270 | /* Make sure to place LPT's save table */ | |
271 | if (!done_lsave) { | |
272 | if (offs + c->lsave_sz > c->leb_size) { | |
273 | alen = ALIGN(offs, c->min_io_size); | |
274 | upd_ltab(c, lnum, c->leb_size - alen, alen - offs); | |
73944a6d | 275 | dbg_chk_lpt_sz(c, 2, alen - offs); |
1e51764a AB |
276 | err = alloc_lpt_leb(c, &lnum); |
277 | if (err) | |
73944a6d | 278 | goto no_space; |
1e51764a AB |
279 | offs = 0; |
280 | ubifs_assert(lnum >= c->lpt_first && | |
281 | lnum <= c->lpt_last); | |
282 | } | |
283 | done_lsave = 1; | |
284 | c->lsave_lnum = lnum; | |
285 | c->lsave_offs = offs; | |
286 | offs += c->lsave_sz; | |
73944a6d | 287 | dbg_chk_lpt_sz(c, 1, c->lsave_sz); |
1e51764a AB |
288 | } |
289 | ||
290 | /* Make sure to place LPT's own lprops table */ | |
291 | if (!done_ltab) { | |
292 | if (offs + c->ltab_sz > c->leb_size) { | |
293 | alen = ALIGN(offs, c->min_io_size); | |
294 | upd_ltab(c, lnum, c->leb_size - alen, alen - offs); | |
73944a6d | 295 | dbg_chk_lpt_sz(c, 2, alen - offs); |
1e51764a AB |
296 | err = alloc_lpt_leb(c, &lnum); |
297 | if (err) | |
73944a6d | 298 | goto no_space; |
1e51764a AB |
299 | offs = 0; |
300 | ubifs_assert(lnum >= c->lpt_first && | |
301 | lnum <= c->lpt_last); | |
302 | } | |
303 | done_ltab = 1; | |
304 | c->ltab_lnum = lnum; | |
305 | c->ltab_offs = offs; | |
306 | offs += c->ltab_sz; | |
73944a6d | 307 | dbg_chk_lpt_sz(c, 1, c->ltab_sz); |
1e51764a AB |
308 | } |
309 | ||
310 | alen = ALIGN(offs, c->min_io_size); | |
311 | upd_ltab(c, lnum, c->leb_size - alen, alen - offs); | |
73944a6d AH |
312 | dbg_chk_lpt_sz(c, 4, alen - offs); |
313 | err = dbg_chk_lpt_sz(c, 3, alen); | |
314 | if (err) | |
315 | return err; | |
1e51764a | 316 | return 0; |
73944a6d AH |
317 | |
318 | no_space: | |
319 | ubifs_err("LPT out of space"); | |
320 | dbg_err("LPT out of space at LEB %d:%d needing %d, done_ltab %d, " | |
321 | "done_lsave %d", lnum, offs, len, done_ltab, done_lsave); | |
322 | dbg_dump_lpt_info(c); | |
2ba5f7ae | 323 | dbg_dump_lpt_lebs(c); |
787845bd | 324 | dump_stack(); |
73944a6d | 325 | return err; |
1e51764a AB |
326 | } |
327 | ||
328 | /** | |
329 | * realloc_lpt_leb - allocate an LPT LEB that is empty. | |
330 | * @c: UBIFS file-system description object | |
331 | * @lnum: LEB number is passed and returned here | |
332 | * | |
333 | * This function duplicates exactly the results of the function alloc_lpt_leb. | |
334 | * It is used during end commit to reallocate the same LEB numbers that were | |
335 | * allocated by alloc_lpt_leb during start commit. | |
336 | * | |
337 | * This function finds the next LEB that was allocated by the alloc_lpt_leb | |
338 | * function starting from @lnum. If a LEB is found it is returned in @lnum and | |
339 | * the function returns %0. Otherwise the function returns -ENOSPC. | |
340 | * Note however, that LPT is designed never to run out of space. | |
341 | */ | |
342 | static int realloc_lpt_leb(struct ubifs_info *c, int *lnum) | |
343 | { | |
344 | int i, n; | |
345 | ||
346 | n = *lnum - c->lpt_first + 1; | |
347 | for (i = n; i < c->lpt_lebs; i++) | |
348 | if (c->ltab[i].cmt) { | |
349 | c->ltab[i].cmt = 0; | |
350 | *lnum = i + c->lpt_first; | |
351 | return 0; | |
352 | } | |
353 | ||
354 | for (i = 0; i < n; i++) | |
355 | if (c->ltab[i].cmt) { | |
356 | c->ltab[i].cmt = 0; | |
357 | *lnum = i + c->lpt_first; | |
358 | return 0; | |
359 | } | |
1e51764a AB |
360 | return -ENOSPC; |
361 | } | |
362 | ||
363 | /** | |
364 | * write_cnodes - write cnodes for commit. | |
365 | * @c: UBIFS file-system description object | |
366 | * | |
367 | * This function returns %0 on success and a negative error code on failure. | |
368 | */ | |
369 | static int write_cnodes(struct ubifs_info *c) | |
370 | { | |
371 | int lnum, offs, len, from, err, wlen, alen, done_ltab, done_lsave; | |
372 | struct ubifs_cnode *cnode; | |
373 | void *buf = c->lpt_buf; | |
374 | ||
375 | cnode = c->lpt_cnext; | |
376 | if (!cnode) | |
377 | return 0; | |
378 | lnum = c->nhead_lnum; | |
379 | offs = c->nhead_offs; | |
380 | from = offs; | |
381 | /* Ensure empty LEB is unmapped */ | |
382 | if (offs == 0) { | |
383 | err = ubifs_leb_unmap(c, lnum); | |
384 | if (err) | |
385 | return err; | |
386 | } | |
387 | /* Try to place lsave and ltab nicely */ | |
388 | done_lsave = !c->big_lpt; | |
389 | done_ltab = 0; | |
390 | if (!done_lsave && offs + c->lsave_sz <= c->leb_size) { | |
391 | done_lsave = 1; | |
392 | ubifs_pack_lsave(c, buf + offs, c->lsave); | |
393 | offs += c->lsave_sz; | |
73944a6d | 394 | dbg_chk_lpt_sz(c, 1, c->lsave_sz); |
1e51764a AB |
395 | } |
396 | ||
397 | if (offs + c->ltab_sz <= c->leb_size) { | |
398 | done_ltab = 1; | |
399 | ubifs_pack_ltab(c, buf + offs, c->ltab_cmt); | |
400 | offs += c->ltab_sz; | |
73944a6d | 401 | dbg_chk_lpt_sz(c, 1, c->ltab_sz); |
1e51764a AB |
402 | } |
403 | ||
404 | /* Loop for each cnode */ | |
405 | do { | |
406 | if (cnode->level) | |
407 | len = c->nnode_sz; | |
408 | else | |
409 | len = c->pnode_sz; | |
410 | while (offs + len > c->leb_size) { | |
411 | wlen = offs - from; | |
412 | if (wlen) { | |
413 | alen = ALIGN(wlen, c->min_io_size); | |
414 | memset(buf + offs, 0xff, alen - wlen); | |
415 | err = ubifs_leb_write(c, lnum, buf + from, from, | |
416 | alen, UBI_SHORTTERM); | |
417 | if (err) | |
418 | return err; | |
73944a6d | 419 | dbg_chk_lpt_sz(c, 4, alen - wlen); |
1e51764a | 420 | } |
73944a6d | 421 | dbg_chk_lpt_sz(c, 2, 0); |
1e51764a AB |
422 | err = realloc_lpt_leb(c, &lnum); |
423 | if (err) | |
73944a6d | 424 | goto no_space; |
1e51764a AB |
425 | offs = 0; |
426 | from = 0; | |
427 | ubifs_assert(lnum >= c->lpt_first && | |
428 | lnum <= c->lpt_last); | |
429 | err = ubifs_leb_unmap(c, lnum); | |
430 | if (err) | |
431 | return err; | |
432 | /* Try to place lsave and ltab nicely */ | |
433 | if (!done_lsave) { | |
434 | done_lsave = 1; | |
435 | ubifs_pack_lsave(c, buf + offs, c->lsave); | |
436 | offs += c->lsave_sz; | |
73944a6d | 437 | dbg_chk_lpt_sz(c, 1, c->lsave_sz); |
1e51764a AB |
438 | continue; |
439 | } | |
440 | if (!done_ltab) { | |
441 | done_ltab = 1; | |
442 | ubifs_pack_ltab(c, buf + offs, c->ltab_cmt); | |
443 | offs += c->ltab_sz; | |
73944a6d | 444 | dbg_chk_lpt_sz(c, 1, c->ltab_sz); |
1e51764a AB |
445 | continue; |
446 | } | |
447 | break; | |
448 | } | |
449 | if (cnode->level) | |
450 | ubifs_pack_nnode(c, buf + offs, | |
451 | (struct ubifs_nnode *)cnode); | |
452 | else | |
453 | ubifs_pack_pnode(c, buf + offs, | |
454 | (struct ubifs_pnode *)cnode); | |
455 | /* | |
456 | * The reason for the barriers is the same as in case of TNC. | |
457 | * See comment in 'write_index()'. 'dirty_cow_nnode()' and | |
458 | * 'dirty_cow_pnode()' are the functions for which this is | |
459 | * important. | |
460 | */ | |
461 | clear_bit(DIRTY_CNODE, &cnode->flags); | |
462 | smp_mb__before_clear_bit(); | |
463 | clear_bit(COW_ZNODE, &cnode->flags); | |
464 | smp_mb__after_clear_bit(); | |
465 | offs += len; | |
73944a6d | 466 | dbg_chk_lpt_sz(c, 1, len); |
1e51764a AB |
467 | cnode = cnode->cnext; |
468 | } while (cnode && cnode != c->lpt_cnext); | |
469 | ||
470 | /* Make sure to place LPT's save table */ | |
471 | if (!done_lsave) { | |
472 | if (offs + c->lsave_sz > c->leb_size) { | |
473 | wlen = offs - from; | |
474 | alen = ALIGN(wlen, c->min_io_size); | |
475 | memset(buf + offs, 0xff, alen - wlen); | |
476 | err = ubifs_leb_write(c, lnum, buf + from, from, alen, | |
477 | UBI_SHORTTERM); | |
478 | if (err) | |
479 | return err; | |
73944a6d | 480 | dbg_chk_lpt_sz(c, 2, alen - wlen); |
1e51764a AB |
481 | err = realloc_lpt_leb(c, &lnum); |
482 | if (err) | |
73944a6d | 483 | goto no_space; |
1e51764a AB |
484 | offs = 0; |
485 | ubifs_assert(lnum >= c->lpt_first && | |
486 | lnum <= c->lpt_last); | |
487 | err = ubifs_leb_unmap(c, lnum); | |
488 | if (err) | |
489 | return err; | |
490 | } | |
491 | done_lsave = 1; | |
492 | ubifs_pack_lsave(c, buf + offs, c->lsave); | |
493 | offs += c->lsave_sz; | |
73944a6d | 494 | dbg_chk_lpt_sz(c, 1, c->lsave_sz); |
1e51764a AB |
495 | } |
496 | ||
497 | /* Make sure to place LPT's own lprops table */ | |
498 | if (!done_ltab) { | |
499 | if (offs + c->ltab_sz > c->leb_size) { | |
500 | wlen = offs - from; | |
501 | alen = ALIGN(wlen, c->min_io_size); | |
502 | memset(buf + offs, 0xff, alen - wlen); | |
503 | err = ubifs_leb_write(c, lnum, buf + from, from, alen, | |
504 | UBI_SHORTTERM); | |
505 | if (err) | |
506 | return err; | |
73944a6d | 507 | dbg_chk_lpt_sz(c, 2, alen - wlen); |
1e51764a AB |
508 | err = realloc_lpt_leb(c, &lnum); |
509 | if (err) | |
73944a6d | 510 | goto no_space; |
1e51764a AB |
511 | offs = 0; |
512 | ubifs_assert(lnum >= c->lpt_first && | |
513 | lnum <= c->lpt_last); | |
514 | err = ubifs_leb_unmap(c, lnum); | |
515 | if (err) | |
516 | return err; | |
517 | } | |
518 | done_ltab = 1; | |
519 | ubifs_pack_ltab(c, buf + offs, c->ltab_cmt); | |
520 | offs += c->ltab_sz; | |
73944a6d | 521 | dbg_chk_lpt_sz(c, 1, c->ltab_sz); |
1e51764a AB |
522 | } |
523 | ||
524 | /* Write remaining data in buffer */ | |
525 | wlen = offs - from; | |
526 | alen = ALIGN(wlen, c->min_io_size); | |
527 | memset(buf + offs, 0xff, alen - wlen); | |
528 | err = ubifs_leb_write(c, lnum, buf + from, from, alen, UBI_SHORTTERM); | |
529 | if (err) | |
530 | return err; | |
73944a6d AH |
531 | |
532 | dbg_chk_lpt_sz(c, 4, alen - wlen); | |
533 | err = dbg_chk_lpt_sz(c, 3, ALIGN(offs, c->min_io_size)); | |
534 | if (err) | |
535 | return err; | |
536 | ||
1e51764a AB |
537 | c->nhead_lnum = lnum; |
538 | c->nhead_offs = ALIGN(offs, c->min_io_size); | |
539 | ||
540 | dbg_lp("LPT root is at %d:%d", c->lpt_lnum, c->lpt_offs); | |
541 | dbg_lp("LPT head is at %d:%d", c->nhead_lnum, c->nhead_offs); | |
542 | dbg_lp("LPT ltab is at %d:%d", c->ltab_lnum, c->ltab_offs); | |
543 | if (c->big_lpt) | |
544 | dbg_lp("LPT lsave is at %d:%d", c->lsave_lnum, c->lsave_offs); | |
73944a6d | 545 | |
1e51764a | 546 | return 0; |
73944a6d AH |
547 | |
548 | no_space: | |
549 | ubifs_err("LPT out of space mismatch"); | |
550 | dbg_err("LPT out of space mismatch at LEB %d:%d needing %d, done_ltab " | |
f92b9826 | 551 | "%d, done_lsave %d", lnum, offs, len, done_ltab, done_lsave); |
73944a6d | 552 | dbg_dump_lpt_info(c); |
2ba5f7ae | 553 | dbg_dump_lpt_lebs(c); |
787845bd | 554 | dump_stack(); |
73944a6d | 555 | return err; |
1e51764a AB |
556 | } |
557 | ||
558 | /** | |
4a29d200 | 559 | * next_pnode_to_dirty - find next pnode to dirty. |
1e51764a AB |
560 | * @c: UBIFS file-system description object |
561 | * @pnode: pnode | |
562 | * | |
4a29d200 AH |
563 | * This function returns the next pnode to dirty or %NULL if there are no more |
564 | * pnodes. Note that pnodes that have never been written (lnum == 0) are | |
565 | * skipped. | |
1e51764a | 566 | */ |
4a29d200 AH |
567 | static struct ubifs_pnode *next_pnode_to_dirty(struct ubifs_info *c, |
568 | struct ubifs_pnode *pnode) | |
1e51764a AB |
569 | { |
570 | struct ubifs_nnode *nnode; | |
571 | int iip; | |
572 | ||
573 | /* Try to go right */ | |
574 | nnode = pnode->parent; | |
4a29d200 | 575 | for (iip = pnode->iip + 1; iip < UBIFS_LPT_FANOUT; iip++) { |
1e51764a AB |
576 | if (nnode->nbranch[iip].lnum) |
577 | return ubifs_get_pnode(c, nnode, iip); | |
1e51764a AB |
578 | } |
579 | ||
580 | /* Go up while can't go right */ | |
581 | do { | |
582 | iip = nnode->iip + 1; | |
583 | nnode = nnode->parent; | |
584 | if (!nnode) | |
585 | return NULL; | |
4a29d200 AH |
586 | for (; iip < UBIFS_LPT_FANOUT; iip++) { |
587 | if (nnode->nbranch[iip].lnum) | |
588 | break; | |
589 | } | |
590 | } while (iip >= UBIFS_LPT_FANOUT); | |
1e51764a AB |
591 | |
592 | /* Go right */ | |
593 | nnode = ubifs_get_nnode(c, nnode, iip); | |
594 | if (IS_ERR(nnode)) | |
595 | return (void *)nnode; | |
596 | ||
597 | /* Go down to level 1 */ | |
598 | while (nnode->level > 1) { | |
4a29d200 AH |
599 | for (iip = 0; iip < UBIFS_LPT_FANOUT; iip++) { |
600 | if (nnode->nbranch[iip].lnum) | |
601 | break; | |
602 | } | |
603 | if (iip >= UBIFS_LPT_FANOUT) { | |
604 | /* | |
605 | * Should not happen, but we need to keep going | |
606 | * if it does. | |
607 | */ | |
608 | iip = 0; | |
609 | } | |
610 | nnode = ubifs_get_nnode(c, nnode, iip); | |
1e51764a AB |
611 | if (IS_ERR(nnode)) |
612 | return (void *)nnode; | |
613 | } | |
614 | ||
4a29d200 AH |
615 | for (iip = 0; iip < UBIFS_LPT_FANOUT; iip++) |
616 | if (nnode->nbranch[iip].lnum) | |
617 | break; | |
618 | if (iip >= UBIFS_LPT_FANOUT) | |
619 | /* Should not happen, but we need to keep going if it does */ | |
620 | iip = 0; | |
621 | return ubifs_get_pnode(c, nnode, iip); | |
1e51764a AB |
622 | } |
623 | ||
624 | /** | |
625 | * pnode_lookup - lookup a pnode in the LPT. | |
626 | * @c: UBIFS file-system description object | |
627 | * @i: pnode number (0 to main_lebs - 1) | |
628 | * | |
629 | * This function returns a pointer to the pnode on success or a negative | |
630 | * error code on failure. | |
631 | */ | |
632 | static struct ubifs_pnode *pnode_lookup(struct ubifs_info *c, int i) | |
633 | { | |
634 | int err, h, iip, shft; | |
635 | struct ubifs_nnode *nnode; | |
636 | ||
637 | if (!c->nroot) { | |
638 | err = ubifs_read_nnode(c, NULL, 0); | |
639 | if (err) | |
640 | return ERR_PTR(err); | |
641 | } | |
642 | i <<= UBIFS_LPT_FANOUT_SHIFT; | |
643 | nnode = c->nroot; | |
644 | shft = c->lpt_hght * UBIFS_LPT_FANOUT_SHIFT; | |
645 | for (h = 1; h < c->lpt_hght; h++) { | |
646 | iip = ((i >> shft) & (UBIFS_LPT_FANOUT - 1)); | |
647 | shft -= UBIFS_LPT_FANOUT_SHIFT; | |
648 | nnode = ubifs_get_nnode(c, nnode, iip); | |
649 | if (IS_ERR(nnode)) | |
650 | return ERR_PTR(PTR_ERR(nnode)); | |
651 | } | |
652 | iip = ((i >> shft) & (UBIFS_LPT_FANOUT - 1)); | |
653 | return ubifs_get_pnode(c, nnode, iip); | |
654 | } | |
655 | ||
656 | /** | |
657 | * add_pnode_dirt - add dirty space to LPT LEB properties. | |
658 | * @c: UBIFS file-system description object | |
659 | * @pnode: pnode for which to add dirt | |
660 | */ | |
661 | static void add_pnode_dirt(struct ubifs_info *c, struct ubifs_pnode *pnode) | |
662 | { | |
663 | ubifs_add_lpt_dirt(c, pnode->parent->nbranch[pnode->iip].lnum, | |
664 | c->pnode_sz); | |
665 | } | |
666 | ||
667 | /** | |
668 | * do_make_pnode_dirty - mark a pnode dirty. | |
669 | * @c: UBIFS file-system description object | |
670 | * @pnode: pnode to mark dirty | |
671 | */ | |
672 | static void do_make_pnode_dirty(struct ubifs_info *c, struct ubifs_pnode *pnode) | |
673 | { | |
674 | /* Assumes cnext list is empty i.e. not called during commit */ | |
675 | if (!test_and_set_bit(DIRTY_CNODE, &pnode->flags)) { | |
676 | struct ubifs_nnode *nnode; | |
677 | ||
678 | c->dirty_pn_cnt += 1; | |
679 | add_pnode_dirt(c, pnode); | |
680 | /* Mark parent and ancestors dirty too */ | |
681 | nnode = pnode->parent; | |
682 | while (nnode) { | |
683 | if (!test_and_set_bit(DIRTY_CNODE, &nnode->flags)) { | |
684 | c->dirty_nn_cnt += 1; | |
685 | ubifs_add_nnode_dirt(c, nnode); | |
686 | nnode = nnode->parent; | |
687 | } else | |
688 | break; | |
689 | } | |
690 | } | |
691 | } | |
692 | ||
693 | /** | |
694 | * make_tree_dirty - mark the entire LEB properties tree dirty. | |
695 | * @c: UBIFS file-system description object | |
696 | * | |
697 | * This function is used by the "small" LPT model to cause the entire LEB | |
698 | * properties tree to be written. The "small" LPT model does not use LPT | |
699 | * garbage collection because it is more efficient to write the entire tree | |
700 | * (because it is small). | |
701 | * | |
702 | * This function returns %0 on success and a negative error code on failure. | |
703 | */ | |
704 | static int make_tree_dirty(struct ubifs_info *c) | |
705 | { | |
706 | struct ubifs_pnode *pnode; | |
707 | ||
708 | pnode = pnode_lookup(c, 0); | |
709 | while (pnode) { | |
710 | do_make_pnode_dirty(c, pnode); | |
4a29d200 | 711 | pnode = next_pnode_to_dirty(c, pnode); |
1e51764a AB |
712 | if (IS_ERR(pnode)) |
713 | return PTR_ERR(pnode); | |
714 | } | |
715 | return 0; | |
716 | } | |
717 | ||
718 | /** | |
719 | * need_write_all - determine if the LPT area is running out of free space. | |
720 | * @c: UBIFS file-system description object | |
721 | * | |
722 | * This function returns %1 if the LPT area is running out of free space and %0 | |
723 | * if it is not. | |
724 | */ | |
725 | static int need_write_all(struct ubifs_info *c) | |
726 | { | |
727 | long long free = 0; | |
728 | int i; | |
729 | ||
730 | for (i = 0; i < c->lpt_lebs; i++) { | |
731 | if (i + c->lpt_first == c->nhead_lnum) | |
732 | free += c->leb_size - c->nhead_offs; | |
733 | else if (c->ltab[i].free == c->leb_size) | |
734 | free += c->leb_size; | |
735 | else if (c->ltab[i].free + c->ltab[i].dirty == c->leb_size) | |
736 | free += c->leb_size; | |
737 | } | |
738 | /* Less than twice the size left */ | |
739 | if (free <= c->lpt_sz * 2) | |
740 | return 1; | |
741 | return 0; | |
742 | } | |
743 | ||
744 | /** | |
745 | * lpt_tgc_start - start trivial garbage collection of LPT LEBs. | |
746 | * @c: UBIFS file-system description object | |
747 | * | |
748 | * LPT trivial garbage collection is where a LPT LEB contains only dirty and | |
749 | * free space and so may be reused as soon as the next commit is completed. | |
750 | * This function is called during start commit to mark LPT LEBs for trivial GC. | |
751 | */ | |
752 | static void lpt_tgc_start(struct ubifs_info *c) | |
753 | { | |
754 | int i; | |
755 | ||
756 | for (i = 0; i < c->lpt_lebs; i++) { | |
757 | if (i + c->lpt_first == c->nhead_lnum) | |
758 | continue; | |
759 | if (c->ltab[i].dirty > 0 && | |
760 | c->ltab[i].free + c->ltab[i].dirty == c->leb_size) { | |
761 | c->ltab[i].tgc = 1; | |
762 | c->ltab[i].free = c->leb_size; | |
763 | c->ltab[i].dirty = 0; | |
764 | dbg_lp("LEB %d", i + c->lpt_first); | |
765 | } | |
766 | } | |
767 | } | |
768 | ||
769 | /** | |
770 | * lpt_tgc_end - end trivial garbage collection of LPT LEBs. | |
771 | * @c: UBIFS file-system description object | |
772 | * | |
773 | * LPT trivial garbage collection is where a LPT LEB contains only dirty and | |
774 | * free space and so may be reused as soon as the next commit is completed. | |
775 | * This function is called after the commit is completed (master node has been | |
80736d41 | 776 | * written) and un-maps LPT LEBs that were marked for trivial GC. |
1e51764a AB |
777 | */ |
778 | static int lpt_tgc_end(struct ubifs_info *c) | |
779 | { | |
780 | int i, err; | |
781 | ||
782 | for (i = 0; i < c->lpt_lebs; i++) | |
783 | if (c->ltab[i].tgc) { | |
784 | err = ubifs_leb_unmap(c, i + c->lpt_first); | |
785 | if (err) | |
786 | return err; | |
787 | c->ltab[i].tgc = 0; | |
788 | dbg_lp("LEB %d", i + c->lpt_first); | |
789 | } | |
790 | return 0; | |
791 | } | |
792 | ||
793 | /** | |
794 | * populate_lsave - fill the lsave array with important LEB numbers. | |
795 | * @c: the UBIFS file-system description object | |
796 | * | |
797 | * This function is only called for the "big" model. It records a small number | |
798 | * of LEB numbers of important LEBs. Important LEBs are ones that are (from | |
799 | * most important to least important): empty, freeable, freeable index, dirty | |
800 | * index, dirty or free. Upon mount, we read this list of LEB numbers and bring | |
801 | * their pnodes into memory. That will stop us from having to scan the LPT | |
802 | * straight away. For the "small" model we assume that scanning the LPT is no | |
803 | * big deal. | |
804 | */ | |
805 | static void populate_lsave(struct ubifs_info *c) | |
806 | { | |
807 | struct ubifs_lprops *lprops; | |
808 | struct ubifs_lpt_heap *heap; | |
809 | int i, cnt = 0; | |
810 | ||
811 | ubifs_assert(c->big_lpt); | |
812 | if (!(c->lpt_drty_flgs & LSAVE_DIRTY)) { | |
813 | c->lpt_drty_flgs |= LSAVE_DIRTY; | |
814 | ubifs_add_lpt_dirt(c, c->lsave_lnum, c->lsave_sz); | |
815 | } | |
816 | list_for_each_entry(lprops, &c->empty_list, list) { | |
817 | c->lsave[cnt++] = lprops->lnum; | |
818 | if (cnt >= c->lsave_cnt) | |
819 | return; | |
820 | } | |
821 | list_for_each_entry(lprops, &c->freeable_list, list) { | |
822 | c->lsave[cnt++] = lprops->lnum; | |
823 | if (cnt >= c->lsave_cnt) | |
824 | return; | |
825 | } | |
826 | list_for_each_entry(lprops, &c->frdi_idx_list, list) { | |
827 | c->lsave[cnt++] = lprops->lnum; | |
828 | if (cnt >= c->lsave_cnt) | |
829 | return; | |
830 | } | |
831 | heap = &c->lpt_heap[LPROPS_DIRTY_IDX - 1]; | |
832 | for (i = 0; i < heap->cnt; i++) { | |
833 | c->lsave[cnt++] = heap->arr[i]->lnum; | |
834 | if (cnt >= c->lsave_cnt) | |
835 | return; | |
836 | } | |
837 | heap = &c->lpt_heap[LPROPS_DIRTY - 1]; | |
838 | for (i = 0; i < heap->cnt; i++) { | |
839 | c->lsave[cnt++] = heap->arr[i]->lnum; | |
840 | if (cnt >= c->lsave_cnt) | |
841 | return; | |
842 | } | |
843 | heap = &c->lpt_heap[LPROPS_FREE - 1]; | |
844 | for (i = 0; i < heap->cnt; i++) { | |
845 | c->lsave[cnt++] = heap->arr[i]->lnum; | |
846 | if (cnt >= c->lsave_cnt) | |
847 | return; | |
848 | } | |
849 | /* Fill it up completely */ | |
850 | while (cnt < c->lsave_cnt) | |
851 | c->lsave[cnt++] = c->main_first; | |
852 | } | |
853 | ||
854 | /** | |
855 | * nnode_lookup - lookup a nnode in the LPT. | |
856 | * @c: UBIFS file-system description object | |
857 | * @i: nnode number | |
858 | * | |
859 | * This function returns a pointer to the nnode on success or a negative | |
860 | * error code on failure. | |
861 | */ | |
862 | static struct ubifs_nnode *nnode_lookup(struct ubifs_info *c, int i) | |
863 | { | |
864 | int err, iip; | |
865 | struct ubifs_nnode *nnode; | |
866 | ||
867 | if (!c->nroot) { | |
868 | err = ubifs_read_nnode(c, NULL, 0); | |
869 | if (err) | |
870 | return ERR_PTR(err); | |
871 | } | |
872 | nnode = c->nroot; | |
873 | while (1) { | |
874 | iip = i & (UBIFS_LPT_FANOUT - 1); | |
875 | i >>= UBIFS_LPT_FANOUT_SHIFT; | |
876 | if (!i) | |
877 | break; | |
878 | nnode = ubifs_get_nnode(c, nnode, iip); | |
879 | if (IS_ERR(nnode)) | |
880 | return nnode; | |
881 | } | |
882 | return nnode; | |
883 | } | |
884 | ||
885 | /** | |
886 | * make_nnode_dirty - find a nnode and, if found, make it dirty. | |
887 | * @c: UBIFS file-system description object | |
888 | * @node_num: nnode number of nnode to make dirty | |
889 | * @lnum: LEB number where nnode was written | |
890 | * @offs: offset where nnode was written | |
891 | * | |
892 | * This function is used by LPT garbage collection. LPT garbage collection is | |
893 | * used only for the "big" LPT model (c->big_lpt == 1). Garbage collection | |
894 | * simply involves marking all the nodes in the LEB being garbage-collected as | |
895 | * dirty. The dirty nodes are written next commit, after which the LEB is free | |
896 | * to be reused. | |
897 | * | |
898 | * This function returns %0 on success and a negative error code on failure. | |
899 | */ | |
900 | static int make_nnode_dirty(struct ubifs_info *c, int node_num, int lnum, | |
901 | int offs) | |
902 | { | |
903 | struct ubifs_nnode *nnode; | |
904 | ||
905 | nnode = nnode_lookup(c, node_num); | |
906 | if (IS_ERR(nnode)) | |
907 | return PTR_ERR(nnode); | |
908 | if (nnode->parent) { | |
909 | struct ubifs_nbranch *branch; | |
910 | ||
911 | branch = &nnode->parent->nbranch[nnode->iip]; | |
912 | if (branch->lnum != lnum || branch->offs != offs) | |
913 | return 0; /* nnode is obsolete */ | |
914 | } else if (c->lpt_lnum != lnum || c->lpt_offs != offs) | |
915 | return 0; /* nnode is obsolete */ | |
916 | /* Assumes cnext list is empty i.e. not called during commit */ | |
917 | if (!test_and_set_bit(DIRTY_CNODE, &nnode->flags)) { | |
918 | c->dirty_nn_cnt += 1; | |
919 | ubifs_add_nnode_dirt(c, nnode); | |
920 | /* Mark parent and ancestors dirty too */ | |
921 | nnode = nnode->parent; | |
922 | while (nnode) { | |
923 | if (!test_and_set_bit(DIRTY_CNODE, &nnode->flags)) { | |
924 | c->dirty_nn_cnt += 1; | |
925 | ubifs_add_nnode_dirt(c, nnode); | |
926 | nnode = nnode->parent; | |
927 | } else | |
928 | break; | |
929 | } | |
930 | } | |
931 | return 0; | |
932 | } | |
933 | ||
934 | /** | |
935 | * make_pnode_dirty - find a pnode and, if found, make it dirty. | |
936 | * @c: UBIFS file-system description object | |
937 | * @node_num: pnode number of pnode to make dirty | |
938 | * @lnum: LEB number where pnode was written | |
939 | * @offs: offset where pnode was written | |
940 | * | |
941 | * This function is used by LPT garbage collection. LPT garbage collection is | |
942 | * used only for the "big" LPT model (c->big_lpt == 1). Garbage collection | |
943 | * simply involves marking all the nodes in the LEB being garbage-collected as | |
944 | * dirty. The dirty nodes are written next commit, after which the LEB is free | |
945 | * to be reused. | |
946 | * | |
947 | * This function returns %0 on success and a negative error code on failure. | |
948 | */ | |
949 | static int make_pnode_dirty(struct ubifs_info *c, int node_num, int lnum, | |
950 | int offs) | |
951 | { | |
952 | struct ubifs_pnode *pnode; | |
953 | struct ubifs_nbranch *branch; | |
954 | ||
955 | pnode = pnode_lookup(c, node_num); | |
956 | if (IS_ERR(pnode)) | |
957 | return PTR_ERR(pnode); | |
958 | branch = &pnode->parent->nbranch[pnode->iip]; | |
959 | if (branch->lnum != lnum || branch->offs != offs) | |
960 | return 0; | |
961 | do_make_pnode_dirty(c, pnode); | |
962 | return 0; | |
963 | } | |
964 | ||
965 | /** | |
966 | * make_ltab_dirty - make ltab node dirty. | |
967 | * @c: UBIFS file-system description object | |
968 | * @lnum: LEB number where ltab was written | |
969 | * @offs: offset where ltab was written | |
970 | * | |
971 | * This function is used by LPT garbage collection. LPT garbage collection is | |
972 | * used only for the "big" LPT model (c->big_lpt == 1). Garbage collection | |
973 | * simply involves marking all the nodes in the LEB being garbage-collected as | |
974 | * dirty. The dirty nodes are written next commit, after which the LEB is free | |
975 | * to be reused. | |
976 | * | |
977 | * This function returns %0 on success and a negative error code on failure. | |
978 | */ | |
979 | static int make_ltab_dirty(struct ubifs_info *c, int lnum, int offs) | |
980 | { | |
981 | if (lnum != c->ltab_lnum || offs != c->ltab_offs) | |
982 | return 0; /* This ltab node is obsolete */ | |
983 | if (!(c->lpt_drty_flgs & LTAB_DIRTY)) { | |
984 | c->lpt_drty_flgs |= LTAB_DIRTY; | |
985 | ubifs_add_lpt_dirt(c, c->ltab_lnum, c->ltab_sz); | |
986 | } | |
987 | return 0; | |
988 | } | |
989 | ||
990 | /** | |
991 | * make_lsave_dirty - make lsave node dirty. | |
992 | * @c: UBIFS file-system description object | |
993 | * @lnum: LEB number where lsave was written | |
994 | * @offs: offset where lsave was written | |
995 | * | |
996 | * This function is used by LPT garbage collection. LPT garbage collection is | |
997 | * used only for the "big" LPT model (c->big_lpt == 1). Garbage collection | |
998 | * simply involves marking all the nodes in the LEB being garbage-collected as | |
999 | * dirty. The dirty nodes are written next commit, after which the LEB is free | |
1000 | * to be reused. | |
1001 | * | |
1002 | * This function returns %0 on success and a negative error code on failure. | |
1003 | */ | |
1004 | static int make_lsave_dirty(struct ubifs_info *c, int lnum, int offs) | |
1005 | { | |
1006 | if (lnum != c->lsave_lnum || offs != c->lsave_offs) | |
1007 | return 0; /* This lsave node is obsolete */ | |
1008 | if (!(c->lpt_drty_flgs & LSAVE_DIRTY)) { | |
1009 | c->lpt_drty_flgs |= LSAVE_DIRTY; | |
1010 | ubifs_add_lpt_dirt(c, c->lsave_lnum, c->lsave_sz); | |
1011 | } | |
1012 | return 0; | |
1013 | } | |
1014 | ||
1015 | /** | |
1016 | * make_node_dirty - make node dirty. | |
1017 | * @c: UBIFS file-system description object | |
1018 | * @node_type: LPT node type | |
1019 | * @node_num: node number | |
1020 | * @lnum: LEB number where node was written | |
1021 | * @offs: offset where node was written | |
1022 | * | |
1023 | * This function is used by LPT garbage collection. LPT garbage collection is | |
1024 | * used only for the "big" LPT model (c->big_lpt == 1). Garbage collection | |
1025 | * simply involves marking all the nodes in the LEB being garbage-collected as | |
1026 | * dirty. The dirty nodes are written next commit, after which the LEB is free | |
1027 | * to be reused. | |
1028 | * | |
1029 | * This function returns %0 on success and a negative error code on failure. | |
1030 | */ | |
1031 | static int make_node_dirty(struct ubifs_info *c, int node_type, int node_num, | |
1032 | int lnum, int offs) | |
1033 | { | |
1034 | switch (node_type) { | |
1035 | case UBIFS_LPT_NNODE: | |
1036 | return make_nnode_dirty(c, node_num, lnum, offs); | |
1037 | case UBIFS_LPT_PNODE: | |
1038 | return make_pnode_dirty(c, node_num, lnum, offs); | |
1039 | case UBIFS_LPT_LTAB: | |
1040 | return make_ltab_dirty(c, lnum, offs); | |
1041 | case UBIFS_LPT_LSAVE: | |
1042 | return make_lsave_dirty(c, lnum, offs); | |
1043 | } | |
1044 | return -EINVAL; | |
1045 | } | |
1046 | ||
1047 | /** | |
1048 | * get_lpt_node_len - return the length of a node based on its type. | |
1049 | * @c: UBIFS file-system description object | |
1050 | * @node_type: LPT node type | |
1051 | */ | |
2ba5f7ae | 1052 | static int get_lpt_node_len(const struct ubifs_info *c, int node_type) |
1e51764a AB |
1053 | { |
1054 | switch (node_type) { | |
1055 | case UBIFS_LPT_NNODE: | |
1056 | return c->nnode_sz; | |
1057 | case UBIFS_LPT_PNODE: | |
1058 | return c->pnode_sz; | |
1059 | case UBIFS_LPT_LTAB: | |
1060 | return c->ltab_sz; | |
1061 | case UBIFS_LPT_LSAVE: | |
1062 | return c->lsave_sz; | |
1063 | } | |
1064 | return 0; | |
1065 | } | |
1066 | ||
1067 | /** | |
1068 | * get_pad_len - return the length of padding in a buffer. | |
1069 | * @c: UBIFS file-system description object | |
1070 | * @buf: buffer | |
1071 | * @len: length of buffer | |
1072 | */ | |
2ba5f7ae | 1073 | static int get_pad_len(const struct ubifs_info *c, uint8_t *buf, int len) |
1e51764a AB |
1074 | { |
1075 | int offs, pad_len; | |
1076 | ||
1077 | if (c->min_io_size == 1) | |
1078 | return 0; | |
1079 | offs = c->leb_size - len; | |
1080 | pad_len = ALIGN(offs, c->min_io_size) - offs; | |
1081 | return pad_len; | |
1082 | } | |
1083 | ||
1084 | /** | |
1085 | * get_lpt_node_type - return type (and node number) of a node in a buffer. | |
1086 | * @c: UBIFS file-system description object | |
1087 | * @buf: buffer | |
1088 | * @node_num: node number is returned here | |
1089 | */ | |
2ba5f7ae AB |
1090 | static int get_lpt_node_type(const struct ubifs_info *c, uint8_t *buf, |
1091 | int *node_num) | |
1e51764a AB |
1092 | { |
1093 | uint8_t *addr = buf + UBIFS_LPT_CRC_BYTES; | |
1094 | int pos = 0, node_type; | |
1095 | ||
1096 | node_type = ubifs_unpack_bits(&addr, &pos, UBIFS_LPT_TYPE_BITS); | |
1097 | *node_num = ubifs_unpack_bits(&addr, &pos, c->pcnt_bits); | |
1098 | return node_type; | |
1099 | } | |
1100 | ||
1101 | /** | |
1102 | * is_a_node - determine if a buffer contains a node. | |
1103 | * @c: UBIFS file-system description object | |
1104 | * @buf: buffer | |
1105 | * @len: length of buffer | |
1106 | * | |
1107 | * This function returns %1 if the buffer contains a node or %0 if it does not. | |
1108 | */ | |
2ba5f7ae | 1109 | static int is_a_node(const struct ubifs_info *c, uint8_t *buf, int len) |
1e51764a AB |
1110 | { |
1111 | uint8_t *addr = buf + UBIFS_LPT_CRC_BYTES; | |
1112 | int pos = 0, node_type, node_len; | |
1113 | uint16_t crc, calc_crc; | |
1114 | ||
be2f6bd6 AH |
1115 | if (len < UBIFS_LPT_CRC_BYTES + (UBIFS_LPT_TYPE_BITS + 7) / 8) |
1116 | return 0; | |
1e51764a AB |
1117 | node_type = ubifs_unpack_bits(&addr, &pos, UBIFS_LPT_TYPE_BITS); |
1118 | if (node_type == UBIFS_LPT_NOT_A_NODE) | |
1119 | return 0; | |
1120 | node_len = get_lpt_node_len(c, node_type); | |
1121 | if (!node_len || node_len > len) | |
1122 | return 0; | |
1123 | pos = 0; | |
1124 | addr = buf; | |
1125 | crc = ubifs_unpack_bits(&addr, &pos, UBIFS_LPT_CRC_BITS); | |
1126 | calc_crc = crc16(-1, buf + UBIFS_LPT_CRC_BYTES, | |
1127 | node_len - UBIFS_LPT_CRC_BYTES); | |
1128 | if (crc != calc_crc) | |
1129 | return 0; | |
1130 | return 1; | |
1131 | } | |
1132 | ||
1e51764a AB |
1133 | /** |
1134 | * lpt_gc_lnum - garbage collect a LPT LEB. | |
1135 | * @c: UBIFS file-system description object | |
1136 | * @lnum: LEB number to garbage collect | |
1137 | * | |
1138 | * LPT garbage collection is used only for the "big" LPT model | |
1139 | * (c->big_lpt == 1). Garbage collection simply involves marking all the nodes | |
1140 | * in the LEB being garbage-collected as dirty. The dirty nodes are written | |
1141 | * next commit, after which the LEB is free to be reused. | |
1142 | * | |
1143 | * This function returns %0 on success and a negative error code on failure. | |
1144 | */ | |
1145 | static int lpt_gc_lnum(struct ubifs_info *c, int lnum) | |
1146 | { | |
1147 | int err, len = c->leb_size, node_type, node_num, node_len, offs; | |
1148 | void *buf = c->lpt_buf; | |
1149 | ||
1150 | dbg_lp("LEB %d", lnum); | |
1151 | err = ubi_read(c->ubi, lnum, buf, 0, c->leb_size); | |
1152 | if (err) { | |
1153 | ubifs_err("cannot read LEB %d, error %d", lnum, err); | |
1154 | return err; | |
1155 | } | |
1156 | while (1) { | |
1157 | if (!is_a_node(c, buf, len)) { | |
1158 | int pad_len; | |
1159 | ||
1160 | pad_len = get_pad_len(c, buf, len); | |
1161 | if (pad_len) { | |
1162 | buf += pad_len; | |
1163 | len -= pad_len; | |
1164 | continue; | |
1165 | } | |
1166 | return 0; | |
1167 | } | |
1168 | node_type = get_lpt_node_type(c, buf, &node_num); | |
1169 | node_len = get_lpt_node_len(c, node_type); | |
1170 | offs = c->leb_size - len; | |
1171 | ubifs_assert(node_len != 0); | |
1172 | mutex_lock(&c->lp_mutex); | |
1173 | err = make_node_dirty(c, node_type, node_num, lnum, offs); | |
1174 | mutex_unlock(&c->lp_mutex); | |
1175 | if (err) | |
1176 | return err; | |
1177 | buf += node_len; | |
1178 | len -= node_len; | |
1179 | } | |
1180 | return 0; | |
1181 | } | |
1182 | ||
1183 | /** | |
1184 | * lpt_gc - LPT garbage collection. | |
1185 | * @c: UBIFS file-system description object | |
1186 | * | |
1187 | * Select a LPT LEB for LPT garbage collection and call 'lpt_gc_lnum()'. | |
1188 | * Returns %0 on success and a negative error code on failure. | |
1189 | */ | |
1190 | static int lpt_gc(struct ubifs_info *c) | |
1191 | { | |
1192 | int i, lnum = -1, dirty = 0; | |
1193 | ||
1194 | mutex_lock(&c->lp_mutex); | |
1195 | for (i = 0; i < c->lpt_lebs; i++) { | |
1196 | ubifs_assert(!c->ltab[i].tgc); | |
1197 | if (i + c->lpt_first == c->nhead_lnum || | |
1198 | c->ltab[i].free + c->ltab[i].dirty == c->leb_size) | |
1199 | continue; | |
1200 | if (c->ltab[i].dirty > dirty) { | |
1201 | dirty = c->ltab[i].dirty; | |
1202 | lnum = i + c->lpt_first; | |
1203 | } | |
1204 | } | |
1205 | mutex_unlock(&c->lp_mutex); | |
1206 | if (lnum == -1) | |
1207 | return -ENOSPC; | |
1208 | return lpt_gc_lnum(c, lnum); | |
1209 | } | |
1210 | ||
1211 | /** | |
1212 | * ubifs_lpt_start_commit - UBIFS commit starts. | |
1213 | * @c: the UBIFS file-system description object | |
1214 | * | |
1215 | * This function has to be called when UBIFS starts the commit operation. | |
1216 | * This function "freezes" all currently dirty LEB properties and does not | |
1217 | * change them anymore. Further changes are saved and tracked separately | |
1218 | * because they are not part of this commit. This function returns zero in case | |
1219 | * of success and a negative error code in case of failure. | |
1220 | */ | |
1221 | int ubifs_lpt_start_commit(struct ubifs_info *c) | |
1222 | { | |
1223 | int err, cnt; | |
1224 | ||
1225 | dbg_lp(""); | |
1226 | ||
1227 | mutex_lock(&c->lp_mutex); | |
73944a6d AH |
1228 | err = dbg_chk_lpt_free_spc(c); |
1229 | if (err) | |
1230 | goto out; | |
1e51764a AB |
1231 | err = dbg_check_ltab(c); |
1232 | if (err) | |
1233 | goto out; | |
1234 | ||
1235 | if (c->check_lpt_free) { | |
1236 | /* | |
1237 | * We ensure there is enough free space in | |
1238 | * ubifs_lpt_post_commit() by marking nodes dirty. That | |
1239 | * information is lost when we unmount, so we also need | |
1240 | * to check free space once after mounting also. | |
1241 | */ | |
1242 | c->check_lpt_free = 0; | |
1243 | while (need_write_all(c)) { | |
1244 | mutex_unlock(&c->lp_mutex); | |
1245 | err = lpt_gc(c); | |
1246 | if (err) | |
1247 | return err; | |
1248 | mutex_lock(&c->lp_mutex); | |
1249 | } | |
1250 | } | |
1251 | ||
1252 | lpt_tgc_start(c); | |
1253 | ||
1254 | if (!c->dirty_pn_cnt) { | |
1255 | dbg_cmt("no cnodes to commit"); | |
1256 | err = 0; | |
1257 | goto out; | |
1258 | } | |
1259 | ||
1260 | if (!c->big_lpt && need_write_all(c)) { | |
1261 | /* If needed, write everything */ | |
1262 | err = make_tree_dirty(c); | |
1263 | if (err) | |
1264 | goto out; | |
1265 | lpt_tgc_start(c); | |
1266 | } | |
1267 | ||
1268 | if (c->big_lpt) | |
1269 | populate_lsave(c); | |
1270 | ||
1271 | cnt = get_cnodes_to_commit(c); | |
1272 | ubifs_assert(cnt != 0); | |
1273 | ||
1274 | err = layout_cnodes(c); | |
1275 | if (err) | |
1276 | goto out; | |
1277 | ||
1278 | /* Copy the LPT's own lprops for end commit to write */ | |
1279 | memcpy(c->ltab_cmt, c->ltab, | |
1280 | sizeof(struct ubifs_lpt_lprops) * c->lpt_lebs); | |
1281 | c->lpt_drty_flgs &= ~(LTAB_DIRTY | LSAVE_DIRTY); | |
1282 | ||
1283 | out: | |
1284 | mutex_unlock(&c->lp_mutex); | |
1285 | return err; | |
1286 | } | |
1287 | ||
1288 | /** | |
1289 | * free_obsolete_cnodes - free obsolete cnodes for commit end. | |
1290 | * @c: UBIFS file-system description object | |
1291 | */ | |
1292 | static void free_obsolete_cnodes(struct ubifs_info *c) | |
1293 | { | |
1294 | struct ubifs_cnode *cnode, *cnext; | |
1295 | ||
1296 | cnext = c->lpt_cnext; | |
1297 | if (!cnext) | |
1298 | return; | |
1299 | do { | |
1300 | cnode = cnext; | |
1301 | cnext = cnode->cnext; | |
1302 | if (test_bit(OBSOLETE_CNODE, &cnode->flags)) | |
1303 | kfree(cnode); | |
1304 | else | |
1305 | cnode->cnext = NULL; | |
1306 | } while (cnext != c->lpt_cnext); | |
1307 | c->lpt_cnext = NULL; | |
1308 | } | |
1309 | ||
1310 | /** | |
1311 | * ubifs_lpt_end_commit - finish the commit operation. | |
1312 | * @c: the UBIFS file-system description object | |
1313 | * | |
1314 | * This function has to be called when the commit operation finishes. It | |
1315 | * flushes the changes which were "frozen" by 'ubifs_lprops_start_commit()' to | |
1316 | * the media. Returns zero in case of success and a negative error code in case | |
1317 | * of failure. | |
1318 | */ | |
1319 | int ubifs_lpt_end_commit(struct ubifs_info *c) | |
1320 | { | |
1321 | int err; | |
1322 | ||
1323 | dbg_lp(""); | |
1324 | ||
1325 | if (!c->lpt_cnext) | |
1326 | return 0; | |
1327 | ||
1328 | err = write_cnodes(c); | |
1329 | if (err) | |
1330 | return err; | |
1331 | ||
1332 | mutex_lock(&c->lp_mutex); | |
1333 | free_obsolete_cnodes(c); | |
1334 | mutex_unlock(&c->lp_mutex); | |
1335 | ||
1336 | return 0; | |
1337 | } | |
1338 | ||
1339 | /** | |
1340 | * ubifs_lpt_post_commit - post commit LPT trivial GC and LPT GC. | |
1341 | * @c: UBIFS file-system description object | |
1342 | * | |
1343 | * LPT trivial GC is completed after a commit. Also LPT GC is done after a | |
1344 | * commit for the "big" LPT model. | |
1345 | */ | |
1346 | int ubifs_lpt_post_commit(struct ubifs_info *c) | |
1347 | { | |
1348 | int err; | |
1349 | ||
1350 | mutex_lock(&c->lp_mutex); | |
1351 | err = lpt_tgc_end(c); | |
1352 | if (err) | |
1353 | goto out; | |
1354 | if (c->big_lpt) | |
1355 | while (need_write_all(c)) { | |
1356 | mutex_unlock(&c->lp_mutex); | |
1357 | err = lpt_gc(c); | |
1358 | if (err) | |
1359 | return err; | |
1360 | mutex_lock(&c->lp_mutex); | |
1361 | } | |
1362 | out: | |
1363 | mutex_unlock(&c->lp_mutex); | |
1364 | return err; | |
1365 | } | |
1366 | ||
1367 | /** | |
1368 | * first_nnode - find the first nnode in memory. | |
1369 | * @c: UBIFS file-system description object | |
1370 | * @hght: height of tree where nnode found is returned here | |
1371 | * | |
1372 | * This function returns a pointer to the nnode found or %NULL if no nnode is | |
1373 | * found. This function is a helper to 'ubifs_lpt_free()'. | |
1374 | */ | |
1375 | static struct ubifs_nnode *first_nnode(struct ubifs_info *c, int *hght) | |
1376 | { | |
1377 | struct ubifs_nnode *nnode; | |
1378 | int h, i, found; | |
1379 | ||
1380 | nnode = c->nroot; | |
1381 | *hght = 0; | |
1382 | if (!nnode) | |
1383 | return NULL; | |
1384 | for (h = 1; h < c->lpt_hght; h++) { | |
1385 | found = 0; | |
1386 | for (i = 0; i < UBIFS_LPT_FANOUT; i++) { | |
1387 | if (nnode->nbranch[i].nnode) { | |
1388 | found = 1; | |
1389 | nnode = nnode->nbranch[i].nnode; | |
1390 | *hght = h; | |
1391 | break; | |
1392 | } | |
1393 | } | |
1394 | if (!found) | |
1395 | break; | |
1396 | } | |
1397 | return nnode; | |
1398 | } | |
1399 | ||
1400 | /** | |
1401 | * next_nnode - find the next nnode in memory. | |
1402 | * @c: UBIFS file-system description object | |
1403 | * @nnode: nnode from which to start. | |
1404 | * @hght: height of tree where nnode is, is passed and returned here | |
1405 | * | |
1406 | * This function returns a pointer to the nnode found or %NULL if no nnode is | |
1407 | * found. This function is a helper to 'ubifs_lpt_free()'. | |
1408 | */ | |
1409 | static struct ubifs_nnode *next_nnode(struct ubifs_info *c, | |
1410 | struct ubifs_nnode *nnode, int *hght) | |
1411 | { | |
1412 | struct ubifs_nnode *parent; | |
1413 | int iip, h, i, found; | |
1414 | ||
1415 | parent = nnode->parent; | |
1416 | if (!parent) | |
1417 | return NULL; | |
1418 | if (nnode->iip == UBIFS_LPT_FANOUT - 1) { | |
1419 | *hght -= 1; | |
1420 | return parent; | |
1421 | } | |
1422 | for (iip = nnode->iip + 1; iip < UBIFS_LPT_FANOUT; iip++) { | |
1423 | nnode = parent->nbranch[iip].nnode; | |
1424 | if (nnode) | |
1425 | break; | |
1426 | } | |
1427 | if (!nnode) { | |
1428 | *hght -= 1; | |
1429 | return parent; | |
1430 | } | |
1431 | for (h = *hght + 1; h < c->lpt_hght; h++) { | |
1432 | found = 0; | |
1433 | for (i = 0; i < UBIFS_LPT_FANOUT; i++) { | |
1434 | if (nnode->nbranch[i].nnode) { | |
1435 | found = 1; | |
1436 | nnode = nnode->nbranch[i].nnode; | |
1437 | *hght = h; | |
1438 | break; | |
1439 | } | |
1440 | } | |
1441 | if (!found) | |
1442 | break; | |
1443 | } | |
1444 | return nnode; | |
1445 | } | |
1446 | ||
1447 | /** | |
1448 | * ubifs_lpt_free - free resources owned by the LPT. | |
1449 | * @c: UBIFS file-system description object | |
1450 | * @wr_only: free only resources used for writing | |
1451 | */ | |
1452 | void ubifs_lpt_free(struct ubifs_info *c, int wr_only) | |
1453 | { | |
1454 | struct ubifs_nnode *nnode; | |
1455 | int i, hght; | |
1456 | ||
1457 | /* Free write-only things first */ | |
1458 | ||
1459 | free_obsolete_cnodes(c); /* Leftover from a failed commit */ | |
1460 | ||
1461 | vfree(c->ltab_cmt); | |
1462 | c->ltab_cmt = NULL; | |
1463 | vfree(c->lpt_buf); | |
1464 | c->lpt_buf = NULL; | |
1465 | kfree(c->lsave); | |
1466 | c->lsave = NULL; | |
1467 | ||
1468 | if (wr_only) | |
1469 | return; | |
1470 | ||
1471 | /* Now free the rest */ | |
1472 | ||
1473 | nnode = first_nnode(c, &hght); | |
1474 | while (nnode) { | |
1475 | for (i = 0; i < UBIFS_LPT_FANOUT; i++) | |
1476 | kfree(nnode->nbranch[i].nnode); | |
1477 | nnode = next_nnode(c, nnode, &hght); | |
1478 | } | |
1479 | for (i = 0; i < LPROPS_HEAP_CNT; i++) | |
1480 | kfree(c->lpt_heap[i].arr); | |
1481 | kfree(c->dirty_idx.arr); | |
1482 | kfree(c->nroot); | |
1483 | vfree(c->ltab); | |
1484 | kfree(c->lpt_nod_buf); | |
1485 | } | |
1486 | ||
1487 | #ifdef CONFIG_UBIFS_FS_DEBUG | |
1488 | ||
1489 | /** | |
80736d41 | 1490 | * dbg_is_all_ff - determine if a buffer contains only 0xFF bytes. |
1e51764a AB |
1491 | * @buf: buffer |
1492 | * @len: buffer length | |
1493 | */ | |
1494 | static int dbg_is_all_ff(uint8_t *buf, int len) | |
1495 | { | |
1496 | int i; | |
1497 | ||
1498 | for (i = 0; i < len; i++) | |
1499 | if (buf[i] != 0xff) | |
1500 | return 0; | |
1501 | return 1; | |
1502 | } | |
1503 | ||
1504 | /** | |
1505 | * dbg_is_nnode_dirty - determine if a nnode is dirty. | |
1506 | * @c: the UBIFS file-system description object | |
1507 | * @lnum: LEB number where nnode was written | |
1508 | * @offs: offset where nnode was written | |
1509 | */ | |
1510 | static int dbg_is_nnode_dirty(struct ubifs_info *c, int lnum, int offs) | |
1511 | { | |
1512 | struct ubifs_nnode *nnode; | |
1513 | int hght; | |
1514 | ||
80736d41 | 1515 | /* Entire tree is in memory so first_nnode / next_nnode are OK */ |
1e51764a AB |
1516 | nnode = first_nnode(c, &hght); |
1517 | for (; nnode; nnode = next_nnode(c, nnode, &hght)) { | |
1518 | struct ubifs_nbranch *branch; | |
1519 | ||
1520 | cond_resched(); | |
1521 | if (nnode->parent) { | |
1522 | branch = &nnode->parent->nbranch[nnode->iip]; | |
1523 | if (branch->lnum != lnum || branch->offs != offs) | |
1524 | continue; | |
1525 | if (test_bit(DIRTY_CNODE, &nnode->flags)) | |
1526 | return 1; | |
1527 | return 0; | |
1528 | } else { | |
1529 | if (c->lpt_lnum != lnum || c->lpt_offs != offs) | |
1530 | continue; | |
1531 | if (test_bit(DIRTY_CNODE, &nnode->flags)) | |
1532 | return 1; | |
1533 | return 0; | |
1534 | } | |
1535 | } | |
1536 | return 1; | |
1537 | } | |
1538 | ||
1539 | /** | |
1540 | * dbg_is_pnode_dirty - determine if a pnode is dirty. | |
1541 | * @c: the UBIFS file-system description object | |
1542 | * @lnum: LEB number where pnode was written | |
1543 | * @offs: offset where pnode was written | |
1544 | */ | |
1545 | static int dbg_is_pnode_dirty(struct ubifs_info *c, int lnum, int offs) | |
1546 | { | |
1547 | int i, cnt; | |
1548 | ||
1549 | cnt = DIV_ROUND_UP(c->main_lebs, UBIFS_LPT_FANOUT); | |
1550 | for (i = 0; i < cnt; i++) { | |
1551 | struct ubifs_pnode *pnode; | |
1552 | struct ubifs_nbranch *branch; | |
1553 | ||
1554 | cond_resched(); | |
1555 | pnode = pnode_lookup(c, i); | |
1556 | if (IS_ERR(pnode)) | |
1557 | return PTR_ERR(pnode); | |
1558 | branch = &pnode->parent->nbranch[pnode->iip]; | |
1559 | if (branch->lnum != lnum || branch->offs != offs) | |
1560 | continue; | |
1561 | if (test_bit(DIRTY_CNODE, &pnode->flags)) | |
1562 | return 1; | |
1563 | return 0; | |
1564 | } | |
1565 | return 1; | |
1566 | } | |
1567 | ||
1568 | /** | |
1569 | * dbg_is_ltab_dirty - determine if a ltab node is dirty. | |
1570 | * @c: the UBIFS file-system description object | |
1571 | * @lnum: LEB number where ltab node was written | |
1572 | * @offs: offset where ltab node was written | |
1573 | */ | |
1574 | static int dbg_is_ltab_dirty(struct ubifs_info *c, int lnum, int offs) | |
1575 | { | |
1576 | if (lnum != c->ltab_lnum || offs != c->ltab_offs) | |
1577 | return 1; | |
1578 | return (c->lpt_drty_flgs & LTAB_DIRTY) != 0; | |
1579 | } | |
1580 | ||
1581 | /** | |
1582 | * dbg_is_lsave_dirty - determine if a lsave node is dirty. | |
1583 | * @c: the UBIFS file-system description object | |
1584 | * @lnum: LEB number where lsave node was written | |
1585 | * @offs: offset where lsave node was written | |
1586 | */ | |
1587 | static int dbg_is_lsave_dirty(struct ubifs_info *c, int lnum, int offs) | |
1588 | { | |
1589 | if (lnum != c->lsave_lnum || offs != c->lsave_offs) | |
1590 | return 1; | |
1591 | return (c->lpt_drty_flgs & LSAVE_DIRTY) != 0; | |
1592 | } | |
1593 | ||
1594 | /** | |
1595 | * dbg_is_node_dirty - determine if a node is dirty. | |
1596 | * @c: the UBIFS file-system description object | |
1597 | * @node_type: node type | |
1598 | * @lnum: LEB number where node was written | |
1599 | * @offs: offset where node was written | |
1600 | */ | |
1601 | static int dbg_is_node_dirty(struct ubifs_info *c, int node_type, int lnum, | |
1602 | int offs) | |
1603 | { | |
1604 | switch (node_type) { | |
1605 | case UBIFS_LPT_NNODE: | |
1606 | return dbg_is_nnode_dirty(c, lnum, offs); | |
1607 | case UBIFS_LPT_PNODE: | |
1608 | return dbg_is_pnode_dirty(c, lnum, offs); | |
1609 | case UBIFS_LPT_LTAB: | |
1610 | return dbg_is_ltab_dirty(c, lnum, offs); | |
1611 | case UBIFS_LPT_LSAVE: | |
1612 | return dbg_is_lsave_dirty(c, lnum, offs); | |
1613 | } | |
1614 | return 1; | |
1615 | } | |
1616 | ||
1617 | /** | |
1618 | * dbg_check_ltab_lnum - check the ltab for a LPT LEB number. | |
1619 | * @c: the UBIFS file-system description object | |
1620 | * @lnum: LEB number where node was written | |
1621 | * @offs: offset where node was written | |
1622 | * | |
1623 | * This function returns %0 on success and a negative error code on failure. | |
1624 | */ | |
1625 | static int dbg_check_ltab_lnum(struct ubifs_info *c, int lnum) | |
1626 | { | |
1627 | int err, len = c->leb_size, dirty = 0, node_type, node_num, node_len; | |
1628 | int ret; | |
17c2f9f8 | 1629 | void *buf = c->dbg->buf; |
1e51764a | 1630 | |
45e12d90 AB |
1631 | if (!(ubifs_chk_flags & UBIFS_CHK_LPROPS)) |
1632 | return 0; | |
1633 | ||
1e51764a AB |
1634 | dbg_lp("LEB %d", lnum); |
1635 | err = ubi_read(c->ubi, lnum, buf, 0, c->leb_size); | |
1636 | if (err) { | |
1637 | dbg_msg("ubi_read failed, LEB %d, error %d", lnum, err); | |
1638 | return err; | |
1639 | } | |
1640 | while (1) { | |
1641 | if (!is_a_node(c, buf, len)) { | |
1642 | int i, pad_len; | |
1643 | ||
1644 | pad_len = get_pad_len(c, buf, len); | |
1645 | if (pad_len) { | |
1646 | buf += pad_len; | |
1647 | len -= pad_len; | |
1648 | dirty += pad_len; | |
1649 | continue; | |
1650 | } | |
1651 | if (!dbg_is_all_ff(buf, len)) { | |
1652 | dbg_msg("invalid empty space in LEB %d at %d", | |
1653 | lnum, c->leb_size - len); | |
1654 | err = -EINVAL; | |
1655 | } | |
1656 | i = lnum - c->lpt_first; | |
1657 | if (len != c->ltab[i].free) { | |
1658 | dbg_msg("invalid free space in LEB %d " | |
1659 | "(free %d, expected %d)", | |
1660 | lnum, len, c->ltab[i].free); | |
1661 | err = -EINVAL; | |
1662 | } | |
1663 | if (dirty != c->ltab[i].dirty) { | |
1664 | dbg_msg("invalid dirty space in LEB %d " | |
1665 | "(dirty %d, expected %d)", | |
1666 | lnum, dirty, c->ltab[i].dirty); | |
1667 | err = -EINVAL; | |
1668 | } | |
1669 | return err; | |
1670 | } | |
1671 | node_type = get_lpt_node_type(c, buf, &node_num); | |
1672 | node_len = get_lpt_node_len(c, node_type); | |
1673 | ret = dbg_is_node_dirty(c, node_type, lnum, c->leb_size - len); | |
1674 | if (ret == 1) | |
1675 | dirty += node_len; | |
1676 | buf += node_len; | |
1677 | len -= node_len; | |
1678 | } | |
1679 | } | |
1680 | ||
1681 | /** | |
1682 | * dbg_check_ltab - check the free and dirty space in the ltab. | |
1683 | * @c: the UBIFS file-system description object | |
1684 | * | |
1685 | * This function returns %0 on success and a negative error code on failure. | |
1686 | */ | |
1687 | int dbg_check_ltab(struct ubifs_info *c) | |
1688 | { | |
1689 | int lnum, err, i, cnt; | |
1690 | ||
1691 | if (!(ubifs_chk_flags & UBIFS_CHK_LPROPS)) | |
1692 | return 0; | |
1693 | ||
1694 | /* Bring the entire tree into memory */ | |
1695 | cnt = DIV_ROUND_UP(c->main_lebs, UBIFS_LPT_FANOUT); | |
1696 | for (i = 0; i < cnt; i++) { | |
1697 | struct ubifs_pnode *pnode; | |
1698 | ||
1699 | pnode = pnode_lookup(c, i); | |
1700 | if (IS_ERR(pnode)) | |
1701 | return PTR_ERR(pnode); | |
1702 | cond_resched(); | |
1703 | } | |
1704 | ||
1705 | /* Check nodes */ | |
1706 | err = dbg_check_lpt_nodes(c, (struct ubifs_cnode *)c->nroot, 0, 0); | |
1707 | if (err) | |
1708 | return err; | |
1709 | ||
1710 | /* Check each LEB */ | |
1711 | for (lnum = c->lpt_first; lnum <= c->lpt_last; lnum++) { | |
1712 | err = dbg_check_ltab_lnum(c, lnum); | |
1713 | if (err) { | |
1714 | dbg_err("failed at LEB %d", lnum); | |
1715 | return err; | |
1716 | } | |
1717 | } | |
1718 | ||
1719 | dbg_lp("succeeded"); | |
1720 | return 0; | |
1721 | } | |
1722 | ||
73944a6d AH |
1723 | /** |
1724 | * dbg_chk_lpt_free_spc - check LPT free space is enough to write entire LPT. | |
1725 | * @c: the UBIFS file-system description object | |
1726 | * | |
1727 | * This function returns %0 on success and a negative error code on failure. | |
1728 | */ | |
1729 | int dbg_chk_lpt_free_spc(struct ubifs_info *c) | |
1730 | { | |
1731 | long long free = 0; | |
1732 | int i; | |
1733 | ||
45e12d90 AB |
1734 | if (!(ubifs_chk_flags & UBIFS_CHK_LPROPS)) |
1735 | return 0; | |
1736 | ||
73944a6d AH |
1737 | for (i = 0; i < c->lpt_lebs; i++) { |
1738 | if (c->ltab[i].tgc || c->ltab[i].cmt) | |
1739 | continue; | |
1740 | if (i + c->lpt_first == c->nhead_lnum) | |
1741 | free += c->leb_size - c->nhead_offs; | |
1742 | else if (c->ltab[i].free == c->leb_size) | |
1743 | free += c->leb_size; | |
1744 | } | |
1745 | if (free < c->lpt_sz) { | |
1746 | dbg_err("LPT space error: free %lld lpt_sz %lld", | |
1747 | free, c->lpt_sz); | |
1748 | dbg_dump_lpt_info(c); | |
2ba5f7ae | 1749 | dbg_dump_lpt_lebs(c); |
787845bd | 1750 | dump_stack(); |
73944a6d AH |
1751 | return -EINVAL; |
1752 | } | |
1753 | return 0; | |
1754 | } | |
1755 | ||
1756 | /** | |
1757 | * dbg_chk_lpt_sz - check LPT does not write more than LPT size. | |
1758 | * @c: the UBIFS file-system description object | |
1759 | * @action: action | |
1760 | * @len: length written | |
1761 | * | |
1762 | * This function returns %0 on success and a negative error code on failure. | |
1763 | */ | |
1764 | int dbg_chk_lpt_sz(struct ubifs_info *c, int action, int len) | |
1765 | { | |
17c2f9f8 | 1766 | struct ubifs_debug_info *d = c->dbg; |
73944a6d AH |
1767 | long long chk_lpt_sz, lpt_sz; |
1768 | int err = 0; | |
1769 | ||
45e12d90 AB |
1770 | if (!(ubifs_chk_flags & UBIFS_CHK_LPROPS)) |
1771 | return 0; | |
1772 | ||
73944a6d AH |
1773 | switch (action) { |
1774 | case 0: | |
17c2f9f8 AB |
1775 | d->chk_lpt_sz = 0; |
1776 | d->chk_lpt_sz2 = 0; | |
1777 | d->chk_lpt_lebs = 0; | |
1778 | d->chk_lpt_wastage = 0; | |
73944a6d AH |
1779 | if (c->dirty_pn_cnt > c->pnode_cnt) { |
1780 | dbg_err("dirty pnodes %d exceed max %d", | |
1781 | c->dirty_pn_cnt, c->pnode_cnt); | |
1782 | err = -EINVAL; | |
1783 | } | |
1784 | if (c->dirty_nn_cnt > c->nnode_cnt) { | |
1785 | dbg_err("dirty nnodes %d exceed max %d", | |
1786 | c->dirty_nn_cnt, c->nnode_cnt); | |
1787 | err = -EINVAL; | |
1788 | } | |
1789 | return err; | |
1790 | case 1: | |
17c2f9f8 | 1791 | d->chk_lpt_sz += len; |
73944a6d AH |
1792 | return 0; |
1793 | case 2: | |
17c2f9f8 AB |
1794 | d->chk_lpt_sz += len; |
1795 | d->chk_lpt_wastage += len; | |
1796 | d->chk_lpt_lebs += 1; | |
73944a6d AH |
1797 | return 0; |
1798 | case 3: | |
1799 | chk_lpt_sz = c->leb_size; | |
17c2f9f8 | 1800 | chk_lpt_sz *= d->chk_lpt_lebs; |
73944a6d | 1801 | chk_lpt_sz += len - c->nhead_offs; |
17c2f9f8 | 1802 | if (d->chk_lpt_sz != chk_lpt_sz) { |
73944a6d | 1803 | dbg_err("LPT wrote %lld but space used was %lld", |
17c2f9f8 | 1804 | d->chk_lpt_sz, chk_lpt_sz); |
73944a6d AH |
1805 | err = -EINVAL; |
1806 | } | |
17c2f9f8 | 1807 | if (d->chk_lpt_sz > c->lpt_sz) { |
73944a6d | 1808 | dbg_err("LPT wrote %lld but lpt_sz is %lld", |
17c2f9f8 | 1809 | d->chk_lpt_sz, c->lpt_sz); |
73944a6d AH |
1810 | err = -EINVAL; |
1811 | } | |
17c2f9f8 | 1812 | if (d->chk_lpt_sz2 && d->chk_lpt_sz != d->chk_lpt_sz2) { |
73944a6d | 1813 | dbg_err("LPT layout size %lld but wrote %lld", |
17c2f9f8 | 1814 | d->chk_lpt_sz, d->chk_lpt_sz2); |
73944a6d AH |
1815 | err = -EINVAL; |
1816 | } | |
17c2f9f8 | 1817 | if (d->chk_lpt_sz2 && d->new_nhead_offs != len) { |
73944a6d | 1818 | dbg_err("LPT new nhead offs: expected %d was %d", |
17c2f9f8 | 1819 | d->new_nhead_offs, len); |
73944a6d AH |
1820 | err = -EINVAL; |
1821 | } | |
1822 | lpt_sz = (long long)c->pnode_cnt * c->pnode_sz; | |
1823 | lpt_sz += (long long)c->nnode_cnt * c->nnode_sz; | |
1824 | lpt_sz += c->ltab_sz; | |
1825 | if (c->big_lpt) | |
1826 | lpt_sz += c->lsave_sz; | |
17c2f9f8 | 1827 | if (d->chk_lpt_sz - d->chk_lpt_wastage > lpt_sz) { |
73944a6d | 1828 | dbg_err("LPT chk_lpt_sz %lld + waste %lld exceeds %lld", |
17c2f9f8 | 1829 | d->chk_lpt_sz, d->chk_lpt_wastage, lpt_sz); |
73944a6d AH |
1830 | err = -EINVAL; |
1831 | } | |
787845bd | 1832 | if (err) { |
73944a6d | 1833 | dbg_dump_lpt_info(c); |
2ba5f7ae | 1834 | dbg_dump_lpt_lebs(c); |
787845bd AB |
1835 | dump_stack(); |
1836 | } | |
17c2f9f8 AB |
1837 | d->chk_lpt_sz2 = d->chk_lpt_sz; |
1838 | d->chk_lpt_sz = 0; | |
1839 | d->chk_lpt_wastage = 0; | |
1840 | d->chk_lpt_lebs = 0; | |
1841 | d->new_nhead_offs = len; | |
73944a6d AH |
1842 | return err; |
1843 | case 4: | |
17c2f9f8 AB |
1844 | d->chk_lpt_sz += len; |
1845 | d->chk_lpt_wastage += len; | |
73944a6d AH |
1846 | return 0; |
1847 | default: | |
1848 | return -EINVAL; | |
1849 | } | |
1850 | } | |
1851 | ||
2ba5f7ae AB |
1852 | /** |
1853 | * dbg_dump_lpt_leb - dump an LPT LEB. | |
1854 | * @c: UBIFS file-system description object | |
1855 | * @lnum: LEB number to dump | |
1856 | * | |
1857 | * This function dumps an LEB from LPT area. Nodes in this area are very | |
1858 | * different to nodes in the main area (e.g., they do not have common headers, | |
1859 | * they do not have 8-byte alignments, etc), so we have a separate function to | |
80736d41 | 1860 | * dump LPT area LEBs. Note, LPT has to be locked by the caller. |
2ba5f7ae AB |
1861 | */ |
1862 | static void dump_lpt_leb(const struct ubifs_info *c, int lnum) | |
1863 | { | |
1864 | int err, len = c->leb_size, node_type, node_num, node_len, offs; | |
1865 | void *buf = c->dbg->buf; | |
1866 | ||
1867 | printk(KERN_DEBUG "(pid %d) start dumping LEB %d\n", | |
1868 | current->pid, lnum); | |
1869 | err = ubi_read(c->ubi, lnum, buf, 0, c->leb_size); | |
1870 | if (err) { | |
1871 | ubifs_err("cannot read LEB %d, error %d", lnum, err); | |
1872 | return; | |
1873 | } | |
1874 | while (1) { | |
1875 | offs = c->leb_size - len; | |
1876 | if (!is_a_node(c, buf, len)) { | |
1877 | int pad_len; | |
1878 | ||
1879 | pad_len = get_pad_len(c, buf, len); | |
1880 | if (pad_len) { | |
1881 | printk(KERN_DEBUG "LEB %d:%d, pad %d bytes\n", | |
1882 | lnum, offs, pad_len); | |
1883 | buf += pad_len; | |
1884 | len -= pad_len; | |
1885 | continue; | |
1886 | } | |
1887 | if (len) | |
1888 | printk(KERN_DEBUG "LEB %d:%d, free %d bytes\n", | |
1889 | lnum, offs, len); | |
1890 | break; | |
1891 | } | |
1892 | ||
1893 | node_type = get_lpt_node_type(c, buf, &node_num); | |
1894 | switch (node_type) { | |
1895 | case UBIFS_LPT_PNODE: | |
1896 | { | |
1897 | node_len = c->pnode_sz; | |
1898 | if (c->big_lpt) | |
1899 | printk(KERN_DEBUG "LEB %d:%d, pnode num %d\n", | |
1900 | lnum, offs, node_num); | |
1901 | else | |
1902 | printk(KERN_DEBUG "LEB %d:%d, pnode\n", | |
1903 | lnum, offs); | |
1904 | break; | |
1905 | } | |
1906 | case UBIFS_LPT_NNODE: | |
1907 | { | |
1908 | int i; | |
1909 | struct ubifs_nnode nnode; | |
1910 | ||
1911 | node_len = c->nnode_sz; | |
1912 | if (c->big_lpt) | |
1913 | printk(KERN_DEBUG "LEB %d:%d, nnode num %d, ", | |
1914 | lnum, offs, node_num); | |
1915 | else | |
1916 | printk(KERN_DEBUG "LEB %d:%d, nnode, ", | |
1917 | lnum, offs); | |
1918 | err = ubifs_unpack_nnode(c, buf, &nnode); | |
1919 | for (i = 0; i < UBIFS_LPT_FANOUT; i++) { | |
1920 | printk("%d:%d", nnode.nbranch[i].lnum, | |
1921 | nnode.nbranch[i].offs); | |
1922 | if (i != UBIFS_LPT_FANOUT - 1) | |
1923 | printk(", "); | |
1924 | } | |
1925 | printk("\n"); | |
1926 | break; | |
1927 | } | |
1928 | case UBIFS_LPT_LTAB: | |
1929 | node_len = c->ltab_sz; | |
1930 | printk(KERN_DEBUG "LEB %d:%d, ltab\n", | |
1931 | lnum, offs); | |
1932 | break; | |
1933 | case UBIFS_LPT_LSAVE: | |
1934 | node_len = c->lsave_sz; | |
1935 | printk(KERN_DEBUG "LEB %d:%d, lsave len\n", lnum, offs); | |
1936 | break; | |
1937 | default: | |
1938 | ubifs_err("LPT node type %d not recognized", node_type); | |
1939 | return; | |
1940 | } | |
1941 | ||
1942 | buf += node_len; | |
1943 | len -= node_len; | |
1944 | } | |
1945 | ||
1946 | printk(KERN_DEBUG "(pid %d) finish dumping LEB %d\n", | |
1947 | current->pid, lnum); | |
1948 | } | |
1949 | ||
1950 | /** | |
1951 | * dbg_dump_lpt_lebs - dump LPT lebs. | |
1952 | * @c: UBIFS file-system description object | |
1953 | * | |
1954 | * This function dumps all LPT LEBs. The caller has to make sure the LPT is | |
1955 | * locked. | |
1956 | */ | |
1957 | void dbg_dump_lpt_lebs(const struct ubifs_info *c) | |
1958 | { | |
1959 | int i; | |
1960 | ||
1961 | printk(KERN_DEBUG "(pid %d) start dumping all LPT LEBs\n", | |
1962 | current->pid); | |
1963 | for (i = 0; i < c->lpt_lebs; i++) | |
1964 | dump_lpt_leb(c, i + c->lpt_first); | |
1965 | printk(KERN_DEBUG "(pid %d) finish dumping all LPT LEBs\n", | |
1966 | current->pid); | |
1967 | } | |
1968 | ||
1e51764a | 1969 | #endif /* CONFIG_UBIFS_FS_DEBUG */ |