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Commit | Line | Data |
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7d4e9ccb | 1 | /* |
1e51764a AB |
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> | |
5a0e3ad6 | 29 | #include <linux/slab.h> |
1e51764a AB |
30 | #include "ubifs.h" |
31 | ||
32 | /** | |
33 | * first_dirty_cnode - find first dirty cnode. | |
34 | * @c: UBIFS file-system description object | |
35 | * @nnode: nnode at which to start | |
36 | * | |
37 | * This function returns the first dirty cnode or %NULL if there is not one. | |
38 | */ | |
39 | static struct ubifs_cnode *first_dirty_cnode(struct ubifs_nnode *nnode) | |
40 | { | |
41 | ubifs_assert(nnode); | |
42 | while (1) { | |
43 | int i, cont = 0; | |
44 | ||
45 | for (i = 0; i < UBIFS_LPT_FANOUT; i++) { | |
46 | struct ubifs_cnode *cnode; | |
47 | ||
48 | cnode = nnode->nbranch[i].cnode; | |
49 | if (cnode && | |
50 | test_bit(DIRTY_CNODE, &cnode->flags)) { | |
51 | if (cnode->level == 0) | |
52 | return cnode; | |
53 | nnode = (struct ubifs_nnode *)cnode; | |
54 | cont = 1; | |
55 | break; | |
56 | } | |
57 | } | |
58 | if (!cont) | |
59 | return (struct ubifs_cnode *)nnode; | |
60 | } | |
61 | } | |
62 | ||
63 | /** | |
64 | * next_dirty_cnode - find next dirty cnode. | |
65 | * @cnode: cnode from which to begin searching | |
66 | * | |
67 | * This function returns the next dirty cnode or %NULL if there is not one. | |
68 | */ | |
69 | static struct ubifs_cnode *next_dirty_cnode(struct ubifs_cnode *cnode) | |
70 | { | |
71 | struct ubifs_nnode *nnode; | |
72 | int i; | |
73 | ||
74 | ubifs_assert(cnode); | |
75 | nnode = cnode->parent; | |
76 | if (!nnode) | |
77 | return NULL; | |
78 | for (i = cnode->iip + 1; i < UBIFS_LPT_FANOUT; i++) { | |
79 | cnode = nnode->nbranch[i].cnode; | |
80 | if (cnode && test_bit(DIRTY_CNODE, &cnode->flags)) { | |
81 | if (cnode->level == 0) | |
82 | return cnode; /* cnode is a pnode */ | |
83 | /* cnode is a nnode */ | |
84 | return first_dirty_cnode((struct ubifs_nnode *)cnode); | |
85 | } | |
86 | } | |
87 | return (struct ubifs_cnode *)nnode; | |
88 | } | |
89 | ||
90 | /** | |
91 | * get_cnodes_to_commit - create list of dirty cnodes to commit. | |
92 | * @c: UBIFS file-system description object | |
93 | * | |
94 | * This function returns the number of cnodes to commit. | |
95 | */ | |
96 | static int get_cnodes_to_commit(struct ubifs_info *c) | |
97 | { | |
98 | struct ubifs_cnode *cnode, *cnext; | |
99 | int cnt = 0; | |
100 | ||
101 | if (!c->nroot) | |
102 | return 0; | |
103 | ||
104 | if (!test_bit(DIRTY_CNODE, &c->nroot->flags)) | |
105 | return 0; | |
106 | ||
107 | c->lpt_cnext = first_dirty_cnode(c->nroot); | |
108 | cnode = c->lpt_cnext; | |
109 | if (!cnode) | |
110 | return 0; | |
111 | cnt += 1; | |
112 | while (1) { | |
113 | ubifs_assert(!test_bit(COW_ZNODE, &cnode->flags)); | |
114 | __set_bit(COW_ZNODE, &cnode->flags); | |
115 | cnext = next_dirty_cnode(cnode); | |
116 | if (!cnext) { | |
117 | cnode->cnext = c->lpt_cnext; | |
118 | break; | |
119 | } | |
120 | cnode->cnext = cnext; | |
121 | cnode = cnext; | |
122 | cnt += 1; | |
123 | } | |
124 | dbg_cmt("committing %d cnodes", cnt); | |
125 | dbg_lp("committing %d cnodes", cnt); | |
126 | ubifs_assert(cnt == c->dirty_nn_cnt + c->dirty_pn_cnt); | |
127 | return cnt; | |
128 | } | |
129 | ||
130 | /** | |
131 | * upd_ltab - update LPT LEB properties. | |
132 | * @c: UBIFS file-system description object | |
133 | * @lnum: LEB number | |
134 | * @free: amount of free space | |
135 | * @dirty: amount of dirty space to add | |
136 | */ | |
137 | static void upd_ltab(struct ubifs_info *c, int lnum, int free, int dirty) | |
138 | { | |
139 | dbg_lp("LEB %d free %d dirty %d to %d +%d", | |
140 | lnum, c->ltab[lnum - c->lpt_first].free, | |
141 | c->ltab[lnum - c->lpt_first].dirty, free, dirty); | |
142 | ubifs_assert(lnum >= c->lpt_first && lnum <= c->lpt_last); | |
143 | c->ltab[lnum - c->lpt_first].free = free; | |
144 | c->ltab[lnum - c->lpt_first].dirty += dirty; | |
145 | } | |
146 | ||
147 | /** | |
148 | * alloc_lpt_leb - allocate an LPT LEB that is empty. | |
149 | * @c: UBIFS file-system description object | |
150 | * @lnum: LEB number is passed and returned here | |
151 | * | |
152 | * This function finds the next empty LEB in the ltab starting from @lnum. If a | |
153 | * an empty LEB is found it is returned in @lnum and the function returns %0. | |
154 | * Otherwise the function returns -ENOSPC. Note however, that LPT is designed | |
155 | * never to run out of space. | |
156 | */ | |
157 | static int alloc_lpt_leb(struct ubifs_info *c, int *lnum) | |
158 | { | |
159 | int i, n; | |
160 | ||
161 | n = *lnum - c->lpt_first + 1; | |
162 | for (i = n; i < c->lpt_lebs; i++) { | |
163 | if (c->ltab[i].tgc || c->ltab[i].cmt) | |
164 | continue; | |
165 | if (c->ltab[i].free == c->leb_size) { | |
166 | c->ltab[i].cmt = 1; | |
167 | *lnum = i + c->lpt_first; | |
168 | return 0; | |
169 | } | |
170 | } | |
171 | ||
172 | for (i = 0; i < n; i++) { | |
173 | if (c->ltab[i].tgc || c->ltab[i].cmt) | |
174 | continue; | |
175 | if (c->ltab[i].free == c->leb_size) { | |
176 | c->ltab[i].cmt = 1; | |
177 | *lnum = i + c->lpt_first; | |
178 | return 0; | |
179 | } | |
180 | } | |
1e51764a AB |
181 | return -ENOSPC; |
182 | } | |
183 | ||
184 | /** | |
185 | * layout_cnodes - layout cnodes for commit. | |
186 | * @c: UBIFS file-system description object | |
187 | * | |
188 | * This function returns %0 on success and a negative error code on failure. | |
189 | */ | |
190 | static int layout_cnodes(struct ubifs_info *c) | |
191 | { | |
192 | int lnum, offs, len, alen, done_lsave, done_ltab, err; | |
193 | struct ubifs_cnode *cnode; | |
194 | ||
73944a6d AH |
195 | err = dbg_chk_lpt_sz(c, 0, 0); |
196 | if (err) | |
197 | return err; | |
1e51764a AB |
198 | cnode = c->lpt_cnext; |
199 | if (!cnode) | |
200 | return 0; | |
201 | lnum = c->nhead_lnum; | |
202 | offs = c->nhead_offs; | |
203 | /* Try to place lsave and ltab nicely */ | |
204 | done_lsave = !c->big_lpt; | |
205 | done_ltab = 0; | |
206 | if (!done_lsave && offs + c->lsave_sz <= c->leb_size) { | |
207 | done_lsave = 1; | |
208 | c->lsave_lnum = lnum; | |
209 | c->lsave_offs = offs; | |
210 | offs += c->lsave_sz; | |
73944a6d | 211 | dbg_chk_lpt_sz(c, 1, c->lsave_sz); |
1e51764a AB |
212 | } |
213 | ||
214 | if (offs + c->ltab_sz <= c->leb_size) { | |
215 | done_ltab = 1; | |
216 | c->ltab_lnum = lnum; | |
217 | c->ltab_offs = offs; | |
218 | offs += c->ltab_sz; | |
73944a6d | 219 | dbg_chk_lpt_sz(c, 1, c->ltab_sz); |
1e51764a AB |
220 | } |
221 | ||
222 | do { | |
223 | if (cnode->level) { | |
224 | len = c->nnode_sz; | |
225 | c->dirty_nn_cnt -= 1; | |
226 | } else { | |
227 | len = c->pnode_sz; | |
228 | c->dirty_pn_cnt -= 1; | |
229 | } | |
230 | while (offs + len > c->leb_size) { | |
231 | alen = ALIGN(offs, c->min_io_size); | |
232 | upd_ltab(c, lnum, c->leb_size - alen, alen - offs); | |
2bc275e9 | 233 | dbg_chk_lpt_sz(c, 2, c->leb_size - offs); |
1e51764a AB |
234 | err = alloc_lpt_leb(c, &lnum); |
235 | if (err) | |
73944a6d | 236 | goto no_space; |
1e51764a AB |
237 | offs = 0; |
238 | ubifs_assert(lnum >= c->lpt_first && | |
239 | lnum <= c->lpt_last); | |
240 | /* Try to place lsave and ltab nicely */ | |
241 | if (!done_lsave) { | |
242 | done_lsave = 1; | |
243 | c->lsave_lnum = lnum; | |
244 | c->lsave_offs = offs; | |
245 | offs += c->lsave_sz; | |
73944a6d | 246 | dbg_chk_lpt_sz(c, 1, c->lsave_sz); |
1e51764a AB |
247 | continue; |
248 | } | |
249 | if (!done_ltab) { | |
250 | done_ltab = 1; | |
251 | c->ltab_lnum = lnum; | |
252 | c->ltab_offs = offs; | |
253 | offs += c->ltab_sz; | |
73944a6d | 254 | dbg_chk_lpt_sz(c, 1, c->ltab_sz); |
1e51764a AB |
255 | continue; |
256 | } | |
257 | break; | |
258 | } | |
259 | if (cnode->parent) { | |
260 | cnode->parent->nbranch[cnode->iip].lnum = lnum; | |
261 | cnode->parent->nbranch[cnode->iip].offs = offs; | |
262 | } else { | |
263 | c->lpt_lnum = lnum; | |
264 | c->lpt_offs = offs; | |
265 | } | |
266 | offs += len; | |
73944a6d | 267 | dbg_chk_lpt_sz(c, 1, len); |
1e51764a AB |
268 | cnode = cnode->cnext; |
269 | } while (cnode && cnode != c->lpt_cnext); | |
270 | ||
271 | /* Make sure to place LPT's save table */ | |
272 | if (!done_lsave) { | |
273 | if (offs + c->lsave_sz > c->leb_size) { | |
274 | alen = ALIGN(offs, c->min_io_size); | |
275 | upd_ltab(c, lnum, c->leb_size - alen, alen - offs); | |
2bc275e9 | 276 | dbg_chk_lpt_sz(c, 2, c->leb_size - offs); |
1e51764a AB |
277 | err = alloc_lpt_leb(c, &lnum); |
278 | if (err) | |
73944a6d | 279 | goto no_space; |
1e51764a AB |
280 | offs = 0; |
281 | ubifs_assert(lnum >= c->lpt_first && | |
282 | lnum <= c->lpt_last); | |
283 | } | |
284 | done_lsave = 1; | |
285 | c->lsave_lnum = lnum; | |
286 | c->lsave_offs = offs; | |
287 | offs += c->lsave_sz; | |
73944a6d | 288 | dbg_chk_lpt_sz(c, 1, c->lsave_sz); |
1e51764a AB |
289 | } |
290 | ||
291 | /* Make sure to place LPT's own lprops table */ | |
292 | if (!done_ltab) { | |
293 | if (offs + c->ltab_sz > c->leb_size) { | |
294 | alen = ALIGN(offs, c->min_io_size); | |
295 | upd_ltab(c, lnum, c->leb_size - alen, alen - offs); | |
2bc275e9 | 296 | dbg_chk_lpt_sz(c, 2, c->leb_size - offs); |
1e51764a AB |
297 | err = alloc_lpt_leb(c, &lnum); |
298 | if (err) | |
73944a6d | 299 | goto no_space; |
1e51764a AB |
300 | offs = 0; |
301 | ubifs_assert(lnum >= c->lpt_first && | |
302 | lnum <= c->lpt_last); | |
303 | } | |
304 | done_ltab = 1; | |
305 | c->ltab_lnum = lnum; | |
306 | c->ltab_offs = offs; | |
307 | offs += c->ltab_sz; | |
73944a6d | 308 | dbg_chk_lpt_sz(c, 1, c->ltab_sz); |
1e51764a AB |
309 | } |
310 | ||
311 | alen = ALIGN(offs, c->min_io_size); | |
312 | upd_ltab(c, lnum, c->leb_size - alen, alen - offs); | |
73944a6d AH |
313 | dbg_chk_lpt_sz(c, 4, alen - offs); |
314 | err = dbg_chk_lpt_sz(c, 3, alen); | |
315 | if (err) | |
316 | return err; | |
1e51764a | 317 | return 0; |
73944a6d AH |
318 | |
319 | no_space: | |
320 | ubifs_err("LPT out of space"); | |
321 | dbg_err("LPT out of space at LEB %d:%d needing %d, done_ltab %d, " | |
322 | "done_lsave %d", lnum, offs, len, done_ltab, done_lsave); | |
323 | dbg_dump_lpt_info(c); | |
2ba5f7ae | 324 | dbg_dump_lpt_lebs(c); |
787845bd | 325 | dump_stack(); |
73944a6d | 326 | return err; |
1e51764a AB |
327 | } |
328 | ||
329 | /** | |
330 | * realloc_lpt_leb - allocate an LPT LEB that is empty. | |
331 | * @c: UBIFS file-system description object | |
332 | * @lnum: LEB number is passed and returned here | |
333 | * | |
334 | * This function duplicates exactly the results of the function alloc_lpt_leb. | |
335 | * It is used during end commit to reallocate the same LEB numbers that were | |
336 | * allocated by alloc_lpt_leb during start commit. | |
337 | * | |
338 | * This function finds the next LEB that was allocated by the alloc_lpt_leb | |
339 | * function starting from @lnum. If a LEB is found it is returned in @lnum and | |
340 | * the function returns %0. Otherwise the function returns -ENOSPC. | |
341 | * Note however, that LPT is designed never to run out of space. | |
342 | */ | |
343 | static int realloc_lpt_leb(struct ubifs_info *c, int *lnum) | |
344 | { | |
345 | int i, n; | |
346 | ||
347 | n = *lnum - c->lpt_first + 1; | |
348 | for (i = n; i < c->lpt_lebs; i++) | |
349 | if (c->ltab[i].cmt) { | |
350 | c->ltab[i].cmt = 0; | |
351 | *lnum = i + c->lpt_first; | |
352 | return 0; | |
353 | } | |
354 | ||
355 | for (i = 0; i < n; i++) | |
356 | if (c->ltab[i].cmt) { | |
357 | c->ltab[i].cmt = 0; | |
358 | *lnum = i + c->lpt_first; | |
359 | return 0; | |
360 | } | |
1e51764a AB |
361 | return -ENOSPC; |
362 | } | |
363 | ||
364 | /** | |
365 | * write_cnodes - write cnodes for commit. | |
366 | * @c: UBIFS file-system description object | |
367 | * | |
368 | * This function returns %0 on success and a negative error code on failure. | |
369 | */ | |
370 | static int write_cnodes(struct ubifs_info *c) | |
371 | { | |
372 | int lnum, offs, len, from, err, wlen, alen, done_ltab, done_lsave; | |
373 | struct ubifs_cnode *cnode; | |
374 | void *buf = c->lpt_buf; | |
375 | ||
376 | cnode = c->lpt_cnext; | |
377 | if (!cnode) | |
378 | return 0; | |
379 | lnum = c->nhead_lnum; | |
380 | offs = c->nhead_offs; | |
381 | from = offs; | |
382 | /* Ensure empty LEB is unmapped */ | |
383 | if (offs == 0) { | |
384 | err = ubifs_leb_unmap(c, lnum); | |
385 | if (err) | |
386 | return err; | |
387 | } | |
388 | /* Try to place lsave and ltab nicely */ | |
389 | done_lsave = !c->big_lpt; | |
390 | done_ltab = 0; | |
391 | if (!done_lsave && offs + c->lsave_sz <= c->leb_size) { | |
392 | done_lsave = 1; | |
393 | ubifs_pack_lsave(c, buf + offs, c->lsave); | |
394 | offs += c->lsave_sz; | |
73944a6d | 395 | dbg_chk_lpt_sz(c, 1, c->lsave_sz); |
1e51764a AB |
396 | } |
397 | ||
398 | if (offs + c->ltab_sz <= c->leb_size) { | |
399 | done_ltab = 1; | |
400 | ubifs_pack_ltab(c, buf + offs, c->ltab_cmt); | |
401 | offs += c->ltab_sz; | |
73944a6d | 402 | dbg_chk_lpt_sz(c, 1, c->ltab_sz); |
1e51764a AB |
403 | } |
404 | ||
405 | /* Loop for each cnode */ | |
406 | do { | |
407 | if (cnode->level) | |
408 | len = c->nnode_sz; | |
409 | else | |
410 | len = c->pnode_sz; | |
411 | while (offs + len > c->leb_size) { | |
412 | wlen = offs - from; | |
413 | if (wlen) { | |
414 | alen = ALIGN(wlen, c->min_io_size); | |
415 | memset(buf + offs, 0xff, alen - wlen); | |
416 | err = ubifs_leb_write(c, lnum, buf + from, from, | |
417 | alen, UBI_SHORTTERM); | |
418 | if (err) | |
419 | return err; | |
420 | } | |
2bc275e9 | 421 | dbg_chk_lpt_sz(c, 2, c->leb_size - offs); |
1e51764a AB |
422 | err = realloc_lpt_leb(c, &lnum); |
423 | if (err) | |
73944a6d | 424 | goto no_space; |
0a6fb8d9 | 425 | offs = from = 0; |
1e51764a AB |
426 | ubifs_assert(lnum >= c->lpt_first && |
427 | lnum <= c->lpt_last); | |
428 | err = ubifs_leb_unmap(c, lnum); | |
429 | if (err) | |
430 | return err; | |
431 | /* Try to place lsave and ltab nicely */ | |
432 | if (!done_lsave) { | |
433 | done_lsave = 1; | |
434 | ubifs_pack_lsave(c, buf + offs, c->lsave); | |
435 | offs += c->lsave_sz; | |
73944a6d | 436 | dbg_chk_lpt_sz(c, 1, c->lsave_sz); |
1e51764a AB |
437 | continue; |
438 | } | |
439 | if (!done_ltab) { | |
440 | done_ltab = 1; | |
441 | ubifs_pack_ltab(c, buf + offs, c->ltab_cmt); | |
442 | offs += c->ltab_sz; | |
73944a6d | 443 | dbg_chk_lpt_sz(c, 1, c->ltab_sz); |
1e51764a AB |
444 | continue; |
445 | } | |
446 | break; | |
447 | } | |
448 | if (cnode->level) | |
449 | ubifs_pack_nnode(c, buf + offs, | |
450 | (struct ubifs_nnode *)cnode); | |
451 | else | |
452 | ubifs_pack_pnode(c, buf + offs, | |
453 | (struct ubifs_pnode *)cnode); | |
454 | /* | |
455 | * The reason for the barriers is the same as in case of TNC. | |
456 | * See comment in 'write_index()'. 'dirty_cow_nnode()' and | |
457 | * 'dirty_cow_pnode()' are the functions for which this is | |
458 | * important. | |
459 | */ | |
460 | clear_bit(DIRTY_CNODE, &cnode->flags); | |
461 | smp_mb__before_clear_bit(); | |
462 | clear_bit(COW_ZNODE, &cnode->flags); | |
463 | smp_mb__after_clear_bit(); | |
464 | offs += len; | |
73944a6d | 465 | dbg_chk_lpt_sz(c, 1, len); |
1e51764a AB |
466 | cnode = cnode->cnext; |
467 | } while (cnode && cnode != c->lpt_cnext); | |
468 | ||
469 | /* Make sure to place LPT's save table */ | |
470 | if (!done_lsave) { | |
471 | if (offs + c->lsave_sz > c->leb_size) { | |
472 | wlen = offs - from; | |
473 | alen = ALIGN(wlen, c->min_io_size); | |
474 | memset(buf + offs, 0xff, alen - wlen); | |
475 | err = ubifs_leb_write(c, lnum, buf + from, from, alen, | |
476 | UBI_SHORTTERM); | |
477 | if (err) | |
478 | return err; | |
2bc275e9 | 479 | dbg_chk_lpt_sz(c, 2, c->leb_size - offs); |
1e51764a AB |
480 | err = realloc_lpt_leb(c, &lnum); |
481 | if (err) | |
73944a6d | 482 | goto no_space; |
0a6fb8d9 | 483 | offs = from = 0; |
1e51764a AB |
484 | ubifs_assert(lnum >= c->lpt_first && |
485 | lnum <= c->lpt_last); | |
486 | err = ubifs_leb_unmap(c, lnum); | |
487 | if (err) | |
488 | return err; | |
489 | } | |
490 | done_lsave = 1; | |
491 | ubifs_pack_lsave(c, buf + offs, c->lsave); | |
492 | offs += c->lsave_sz; | |
73944a6d | 493 | dbg_chk_lpt_sz(c, 1, c->lsave_sz); |
1e51764a AB |
494 | } |
495 | ||
496 | /* Make sure to place LPT's own lprops table */ | |
497 | if (!done_ltab) { | |
498 | if (offs + c->ltab_sz > c->leb_size) { | |
499 | wlen = offs - from; | |
500 | alen = ALIGN(wlen, c->min_io_size); | |
501 | memset(buf + offs, 0xff, alen - wlen); | |
502 | err = ubifs_leb_write(c, lnum, buf + from, from, alen, | |
503 | UBI_SHORTTERM); | |
504 | if (err) | |
505 | return err; | |
2bc275e9 | 506 | dbg_chk_lpt_sz(c, 2, c->leb_size - offs); |
1e51764a AB |
507 | err = realloc_lpt_leb(c, &lnum); |
508 | if (err) | |
73944a6d | 509 | goto no_space; |
0a6fb8d9 | 510 | offs = from = 0; |
1e51764a AB |
511 | ubifs_assert(lnum >= c->lpt_first && |
512 | lnum <= c->lpt_last); | |
513 | err = ubifs_leb_unmap(c, lnum); | |
514 | if (err) | |
515 | return err; | |
516 | } | |
517 | done_ltab = 1; | |
518 | ubifs_pack_ltab(c, buf + offs, c->ltab_cmt); | |
519 | offs += c->ltab_sz; | |
73944a6d | 520 | dbg_chk_lpt_sz(c, 1, c->ltab_sz); |
1e51764a AB |
521 | } |
522 | ||
523 | /* Write remaining data in buffer */ | |
524 | wlen = offs - from; | |
525 | alen = ALIGN(wlen, c->min_io_size); | |
526 | memset(buf + offs, 0xff, alen - wlen); | |
527 | err = ubifs_leb_write(c, lnum, buf + from, from, alen, UBI_SHORTTERM); | |
528 | if (err) | |
529 | return err; | |
73944a6d AH |
530 | |
531 | dbg_chk_lpt_sz(c, 4, alen - wlen); | |
532 | err = dbg_chk_lpt_sz(c, 3, ALIGN(offs, c->min_io_size)); | |
533 | if (err) | |
534 | return err; | |
535 | ||
1e51764a AB |
536 | c->nhead_lnum = lnum; |
537 | c->nhead_offs = ALIGN(offs, c->min_io_size); | |
538 | ||
539 | dbg_lp("LPT root is at %d:%d", c->lpt_lnum, c->lpt_offs); | |
540 | dbg_lp("LPT head is at %d:%d", c->nhead_lnum, c->nhead_offs); | |
541 | dbg_lp("LPT ltab is at %d:%d", c->ltab_lnum, c->ltab_offs); | |
542 | if (c->big_lpt) | |
543 | dbg_lp("LPT lsave is at %d:%d", c->lsave_lnum, c->lsave_offs); | |
73944a6d | 544 | |
1e51764a | 545 | return 0; |
73944a6d AH |
546 | |
547 | no_space: | |
548 | ubifs_err("LPT out of space mismatch"); | |
549 | dbg_err("LPT out of space mismatch at LEB %d:%d needing %d, done_ltab " | |
f92b9826 | 550 | "%d, done_lsave %d", lnum, offs, len, done_ltab, done_lsave); |
73944a6d | 551 | dbg_dump_lpt_info(c); |
2ba5f7ae | 552 | dbg_dump_lpt_lebs(c); |
787845bd | 553 | dump_stack(); |
73944a6d | 554 | return err; |
1e51764a AB |
555 | } |
556 | ||
557 | /** | |
4a29d200 | 558 | * next_pnode_to_dirty - find next pnode to dirty. |
1e51764a AB |
559 | * @c: UBIFS file-system description object |
560 | * @pnode: pnode | |
561 | * | |
4a29d200 AH |
562 | * This function returns the next pnode to dirty or %NULL if there are no more |
563 | * pnodes. Note that pnodes that have never been written (lnum == 0) are | |
564 | * skipped. | |
1e51764a | 565 | */ |
4a29d200 AH |
566 | static struct ubifs_pnode *next_pnode_to_dirty(struct ubifs_info *c, |
567 | struct ubifs_pnode *pnode) | |
1e51764a AB |
568 | { |
569 | struct ubifs_nnode *nnode; | |
570 | int iip; | |
571 | ||
572 | /* Try to go right */ | |
573 | nnode = pnode->parent; | |
4a29d200 | 574 | for (iip = pnode->iip + 1; iip < UBIFS_LPT_FANOUT; iip++) { |
1e51764a AB |
575 | if (nnode->nbranch[iip].lnum) |
576 | return ubifs_get_pnode(c, nnode, iip); | |
1e51764a AB |
577 | } |
578 | ||
579 | /* Go up while can't go right */ | |
580 | do { | |
581 | iip = nnode->iip + 1; | |
582 | nnode = nnode->parent; | |
583 | if (!nnode) | |
584 | return NULL; | |
4a29d200 AH |
585 | for (; iip < UBIFS_LPT_FANOUT; iip++) { |
586 | if (nnode->nbranch[iip].lnum) | |
587 | break; | |
588 | } | |
589 | } while (iip >= UBIFS_LPT_FANOUT); | |
1e51764a AB |
590 | |
591 | /* Go right */ | |
592 | nnode = ubifs_get_nnode(c, nnode, iip); | |
593 | if (IS_ERR(nnode)) | |
594 | return (void *)nnode; | |
595 | ||
596 | /* Go down to level 1 */ | |
597 | while (nnode->level > 1) { | |
4a29d200 AH |
598 | for (iip = 0; iip < UBIFS_LPT_FANOUT; iip++) { |
599 | if (nnode->nbranch[iip].lnum) | |
600 | break; | |
601 | } | |
602 | if (iip >= UBIFS_LPT_FANOUT) { | |
603 | /* | |
604 | * Should not happen, but we need to keep going | |
605 | * if it does. | |
606 | */ | |
607 | iip = 0; | |
608 | } | |
609 | nnode = ubifs_get_nnode(c, nnode, iip); | |
1e51764a AB |
610 | if (IS_ERR(nnode)) |
611 | return (void *)nnode; | |
612 | } | |
613 | ||
4a29d200 AH |
614 | for (iip = 0; iip < UBIFS_LPT_FANOUT; iip++) |
615 | if (nnode->nbranch[iip].lnum) | |
616 | break; | |
617 | if (iip >= UBIFS_LPT_FANOUT) | |
618 | /* Should not happen, but we need to keep going if it does */ | |
619 | iip = 0; | |
620 | return ubifs_get_pnode(c, nnode, iip); | |
1e51764a AB |
621 | } |
622 | ||
623 | /** | |
624 | * pnode_lookup - lookup a pnode in the LPT. | |
625 | * @c: UBIFS file-system description object | |
626 | * @i: pnode number (0 to main_lebs - 1) | |
627 | * | |
628 | * This function returns a pointer to the pnode on success or a negative | |
629 | * error code on failure. | |
630 | */ | |
631 | static struct ubifs_pnode *pnode_lookup(struct ubifs_info *c, int i) | |
632 | { | |
633 | int err, h, iip, shft; | |
634 | struct ubifs_nnode *nnode; | |
635 | ||
636 | if (!c->nroot) { | |
637 | err = ubifs_read_nnode(c, NULL, 0); | |
638 | if (err) | |
639 | return ERR_PTR(err); | |
640 | } | |
641 | i <<= UBIFS_LPT_FANOUT_SHIFT; | |
642 | nnode = c->nroot; | |
643 | shft = c->lpt_hght * UBIFS_LPT_FANOUT_SHIFT; | |
644 | for (h = 1; h < c->lpt_hght; h++) { | |
645 | iip = ((i >> shft) & (UBIFS_LPT_FANOUT - 1)); | |
646 | shft -= UBIFS_LPT_FANOUT_SHIFT; | |
647 | nnode = ubifs_get_nnode(c, nnode, iip); | |
648 | if (IS_ERR(nnode)) | |
6da5156f | 649 | return ERR_CAST(nnode); |
1e51764a AB |
650 | } |
651 | iip = ((i >> shft) & (UBIFS_LPT_FANOUT - 1)); | |
652 | return ubifs_get_pnode(c, nnode, iip); | |
653 | } | |
654 | ||
655 | /** | |
656 | * add_pnode_dirt - add dirty space to LPT LEB properties. | |
657 | * @c: UBIFS file-system description object | |
658 | * @pnode: pnode for which to add dirt | |
659 | */ | |
660 | static void add_pnode_dirt(struct ubifs_info *c, struct ubifs_pnode *pnode) | |
661 | { | |
662 | ubifs_add_lpt_dirt(c, pnode->parent->nbranch[pnode->iip].lnum, | |
663 | c->pnode_sz); | |
664 | } | |
665 | ||
666 | /** | |
667 | * do_make_pnode_dirty - mark a pnode dirty. | |
668 | * @c: UBIFS file-system description object | |
669 | * @pnode: pnode to mark dirty | |
670 | */ | |
671 | static void do_make_pnode_dirty(struct ubifs_info *c, struct ubifs_pnode *pnode) | |
672 | { | |
673 | /* Assumes cnext list is empty i.e. not called during commit */ | |
674 | if (!test_and_set_bit(DIRTY_CNODE, &pnode->flags)) { | |
675 | struct ubifs_nnode *nnode; | |
676 | ||
677 | c->dirty_pn_cnt += 1; | |
678 | add_pnode_dirt(c, pnode); | |
679 | /* Mark parent and ancestors dirty too */ | |
680 | nnode = pnode->parent; | |
681 | while (nnode) { | |
682 | if (!test_and_set_bit(DIRTY_CNODE, &nnode->flags)) { | |
683 | c->dirty_nn_cnt += 1; | |
684 | ubifs_add_nnode_dirt(c, nnode); | |
685 | nnode = nnode->parent; | |
686 | } else | |
687 | break; | |
688 | } | |
689 | } | |
690 | } | |
691 | ||
692 | /** | |
693 | * make_tree_dirty - mark the entire LEB properties tree dirty. | |
694 | * @c: UBIFS file-system description object | |
695 | * | |
696 | * This function is used by the "small" LPT model to cause the entire LEB | |
697 | * properties tree to be written. The "small" LPT model does not use LPT | |
698 | * garbage collection because it is more efficient to write the entire tree | |
699 | * (because it is small). | |
700 | * | |
701 | * This function returns %0 on success and a negative error code on failure. | |
702 | */ | |
703 | static int make_tree_dirty(struct ubifs_info *c) | |
704 | { | |
705 | struct ubifs_pnode *pnode; | |
706 | ||
707 | pnode = pnode_lookup(c, 0); | |
8c893a55 VK |
708 | if (IS_ERR(pnode)) |
709 | return PTR_ERR(pnode); | |
710 | ||
1e51764a AB |
711 | while (pnode) { |
712 | do_make_pnode_dirty(c, pnode); | |
4a29d200 | 713 | pnode = next_pnode_to_dirty(c, pnode); |
1e51764a AB |
714 | if (IS_ERR(pnode)) |
715 | return PTR_ERR(pnode); | |
716 | } | |
717 | return 0; | |
718 | } | |
719 | ||
720 | /** | |
721 | * need_write_all - determine if the LPT area is running out of free space. | |
722 | * @c: UBIFS file-system description object | |
723 | * | |
724 | * This function returns %1 if the LPT area is running out of free space and %0 | |
725 | * if it is not. | |
726 | */ | |
727 | static int need_write_all(struct ubifs_info *c) | |
728 | { | |
729 | long long free = 0; | |
730 | int i; | |
731 | ||
732 | for (i = 0; i < c->lpt_lebs; i++) { | |
733 | if (i + c->lpt_first == c->nhead_lnum) | |
734 | free += c->leb_size - c->nhead_offs; | |
735 | else if (c->ltab[i].free == c->leb_size) | |
736 | free += c->leb_size; | |
737 | else if (c->ltab[i].free + c->ltab[i].dirty == c->leb_size) | |
738 | free += c->leb_size; | |
739 | } | |
740 | /* Less than twice the size left */ | |
741 | if (free <= c->lpt_sz * 2) | |
742 | return 1; | |
743 | return 0; | |
744 | } | |
745 | ||
746 | /** | |
747 | * lpt_tgc_start - start trivial garbage collection of LPT LEBs. | |
748 | * @c: UBIFS file-system description object | |
749 | * | |
750 | * LPT trivial garbage collection is where a LPT LEB contains only dirty and | |
751 | * free space and so may be reused as soon as the next commit is completed. | |
752 | * This function is called during start commit to mark LPT LEBs for trivial GC. | |
753 | */ | |
754 | static void lpt_tgc_start(struct ubifs_info *c) | |
755 | { | |
756 | int i; | |
757 | ||
758 | for (i = 0; i < c->lpt_lebs; i++) { | |
759 | if (i + c->lpt_first == c->nhead_lnum) | |
760 | continue; | |
761 | if (c->ltab[i].dirty > 0 && | |
762 | c->ltab[i].free + c->ltab[i].dirty == c->leb_size) { | |
763 | c->ltab[i].tgc = 1; | |
764 | c->ltab[i].free = c->leb_size; | |
765 | c->ltab[i].dirty = 0; | |
766 | dbg_lp("LEB %d", i + c->lpt_first); | |
767 | } | |
768 | } | |
769 | } | |
770 | ||
771 | /** | |
772 | * lpt_tgc_end - end trivial garbage collection of LPT LEBs. | |
773 | * @c: UBIFS file-system description object | |
774 | * | |
775 | * LPT trivial garbage collection is where a LPT LEB contains only dirty and | |
776 | * free space and so may be reused as soon as the next commit is completed. | |
777 | * This function is called after the commit is completed (master node has been | |
80736d41 | 778 | * written) and un-maps LPT LEBs that were marked for trivial GC. |
1e51764a AB |
779 | */ |
780 | static int lpt_tgc_end(struct ubifs_info *c) | |
781 | { | |
782 | int i, err; | |
783 | ||
784 | for (i = 0; i < c->lpt_lebs; i++) | |
785 | if (c->ltab[i].tgc) { | |
786 | err = ubifs_leb_unmap(c, i + c->lpt_first); | |
787 | if (err) | |
788 | return err; | |
789 | c->ltab[i].tgc = 0; | |
790 | dbg_lp("LEB %d", i + c->lpt_first); | |
791 | } | |
792 | return 0; | |
793 | } | |
794 | ||
795 | /** | |
796 | * populate_lsave - fill the lsave array with important LEB numbers. | |
797 | * @c: the UBIFS file-system description object | |
798 | * | |
799 | * This function is only called for the "big" model. It records a small number | |
800 | * of LEB numbers of important LEBs. Important LEBs are ones that are (from | |
801 | * most important to least important): empty, freeable, freeable index, dirty | |
802 | * index, dirty or free. Upon mount, we read this list of LEB numbers and bring | |
803 | * their pnodes into memory. That will stop us from having to scan the LPT | |
804 | * straight away. For the "small" model we assume that scanning the LPT is no | |
805 | * big deal. | |
806 | */ | |
807 | static void populate_lsave(struct ubifs_info *c) | |
808 | { | |
809 | struct ubifs_lprops *lprops; | |
810 | struct ubifs_lpt_heap *heap; | |
811 | int i, cnt = 0; | |
812 | ||
813 | ubifs_assert(c->big_lpt); | |
814 | if (!(c->lpt_drty_flgs & LSAVE_DIRTY)) { | |
815 | c->lpt_drty_flgs |= LSAVE_DIRTY; | |
816 | ubifs_add_lpt_dirt(c, c->lsave_lnum, c->lsave_sz); | |
817 | } | |
818 | list_for_each_entry(lprops, &c->empty_list, list) { | |
819 | c->lsave[cnt++] = lprops->lnum; | |
820 | if (cnt >= c->lsave_cnt) | |
821 | return; | |
822 | } | |
823 | list_for_each_entry(lprops, &c->freeable_list, list) { | |
824 | c->lsave[cnt++] = lprops->lnum; | |
825 | if (cnt >= c->lsave_cnt) | |
826 | return; | |
827 | } | |
828 | list_for_each_entry(lprops, &c->frdi_idx_list, list) { | |
829 | c->lsave[cnt++] = lprops->lnum; | |
830 | if (cnt >= c->lsave_cnt) | |
831 | return; | |
832 | } | |
833 | heap = &c->lpt_heap[LPROPS_DIRTY_IDX - 1]; | |
834 | for (i = 0; i < heap->cnt; i++) { | |
835 | c->lsave[cnt++] = heap->arr[i]->lnum; | |
836 | if (cnt >= c->lsave_cnt) | |
837 | return; | |
838 | } | |
839 | heap = &c->lpt_heap[LPROPS_DIRTY - 1]; | |
840 | for (i = 0; i < heap->cnt; i++) { | |
841 | c->lsave[cnt++] = heap->arr[i]->lnum; | |
842 | if (cnt >= c->lsave_cnt) | |
843 | return; | |
844 | } | |
845 | heap = &c->lpt_heap[LPROPS_FREE - 1]; | |
846 | for (i = 0; i < heap->cnt; i++) { | |
847 | c->lsave[cnt++] = heap->arr[i]->lnum; | |
848 | if (cnt >= c->lsave_cnt) | |
849 | return; | |
850 | } | |
851 | /* Fill it up completely */ | |
852 | while (cnt < c->lsave_cnt) | |
853 | c->lsave[cnt++] = c->main_first; | |
854 | } | |
855 | ||
856 | /** | |
857 | * nnode_lookup - lookup a nnode in the LPT. | |
858 | * @c: UBIFS file-system description object | |
859 | * @i: nnode number | |
860 | * | |
861 | * This function returns a pointer to the nnode on success or a negative | |
862 | * error code on failure. | |
863 | */ | |
864 | static struct ubifs_nnode *nnode_lookup(struct ubifs_info *c, int i) | |
865 | { | |
866 | int err, iip; | |
867 | struct ubifs_nnode *nnode; | |
868 | ||
869 | if (!c->nroot) { | |
870 | err = ubifs_read_nnode(c, NULL, 0); | |
871 | if (err) | |
872 | return ERR_PTR(err); | |
873 | } | |
874 | nnode = c->nroot; | |
875 | while (1) { | |
876 | iip = i & (UBIFS_LPT_FANOUT - 1); | |
877 | i >>= UBIFS_LPT_FANOUT_SHIFT; | |
878 | if (!i) | |
879 | break; | |
880 | nnode = ubifs_get_nnode(c, nnode, iip); | |
881 | if (IS_ERR(nnode)) | |
882 | return nnode; | |
883 | } | |
884 | return nnode; | |
885 | } | |
886 | ||
887 | /** | |
888 | * make_nnode_dirty - find a nnode and, if found, make it dirty. | |
889 | * @c: UBIFS file-system description object | |
890 | * @node_num: nnode number of nnode to make dirty | |
891 | * @lnum: LEB number where nnode was written | |
892 | * @offs: offset where nnode was written | |
893 | * | |
894 | * This function is used by LPT garbage collection. LPT garbage collection is | |
895 | * used only for the "big" LPT model (c->big_lpt == 1). Garbage collection | |
896 | * simply involves marking all the nodes in the LEB being garbage-collected as | |
897 | * dirty. The dirty nodes are written next commit, after which the LEB is free | |
898 | * to be reused. | |
899 | * | |
900 | * This function returns %0 on success and a negative error code on failure. | |
901 | */ | |
902 | static int make_nnode_dirty(struct ubifs_info *c, int node_num, int lnum, | |
903 | int offs) | |
904 | { | |
905 | struct ubifs_nnode *nnode; | |
906 | ||
907 | nnode = nnode_lookup(c, node_num); | |
908 | if (IS_ERR(nnode)) | |
909 | return PTR_ERR(nnode); | |
910 | if (nnode->parent) { | |
911 | struct ubifs_nbranch *branch; | |
912 | ||
913 | branch = &nnode->parent->nbranch[nnode->iip]; | |
914 | if (branch->lnum != lnum || branch->offs != offs) | |
915 | return 0; /* nnode is obsolete */ | |
916 | } else if (c->lpt_lnum != lnum || c->lpt_offs != offs) | |
917 | return 0; /* nnode is obsolete */ | |
918 | /* Assumes cnext list is empty i.e. not called during commit */ | |
919 | if (!test_and_set_bit(DIRTY_CNODE, &nnode->flags)) { | |
920 | c->dirty_nn_cnt += 1; | |
921 | ubifs_add_nnode_dirt(c, nnode); | |
922 | /* Mark parent and ancestors dirty too */ | |
923 | nnode = nnode->parent; | |
924 | while (nnode) { | |
925 | if (!test_and_set_bit(DIRTY_CNODE, &nnode->flags)) { | |
926 | c->dirty_nn_cnt += 1; | |
927 | ubifs_add_nnode_dirt(c, nnode); | |
928 | nnode = nnode->parent; | |
929 | } else | |
930 | break; | |
931 | } | |
932 | } | |
933 | return 0; | |
934 | } | |
935 | ||
936 | /** | |
937 | * make_pnode_dirty - find a pnode and, if found, make it dirty. | |
938 | * @c: UBIFS file-system description object | |
939 | * @node_num: pnode number of pnode to make dirty | |
940 | * @lnum: LEB number where pnode was written | |
941 | * @offs: offset where pnode was written | |
942 | * | |
943 | * This function is used by LPT garbage collection. LPT garbage collection is | |
944 | * used only for the "big" LPT model (c->big_lpt == 1). Garbage collection | |
945 | * simply involves marking all the nodes in the LEB being garbage-collected as | |
946 | * dirty. The dirty nodes are written next commit, after which the LEB is free | |
947 | * to be reused. | |
948 | * | |
949 | * This function returns %0 on success and a negative error code on failure. | |
950 | */ | |
951 | static int make_pnode_dirty(struct ubifs_info *c, int node_num, int lnum, | |
952 | int offs) | |
953 | { | |
954 | struct ubifs_pnode *pnode; | |
955 | struct ubifs_nbranch *branch; | |
956 | ||
957 | pnode = pnode_lookup(c, node_num); | |
958 | if (IS_ERR(pnode)) | |
959 | return PTR_ERR(pnode); | |
960 | branch = &pnode->parent->nbranch[pnode->iip]; | |
961 | if (branch->lnum != lnum || branch->offs != offs) | |
962 | return 0; | |
963 | do_make_pnode_dirty(c, pnode); | |
964 | return 0; | |
965 | } | |
966 | ||
967 | /** | |
968 | * make_ltab_dirty - make ltab node dirty. | |
969 | * @c: UBIFS file-system description object | |
970 | * @lnum: LEB number where ltab was written | |
971 | * @offs: offset where ltab was written | |
972 | * | |
973 | * This function is used by LPT garbage collection. LPT garbage collection is | |
974 | * used only for the "big" LPT model (c->big_lpt == 1). Garbage collection | |
975 | * simply involves marking all the nodes in the LEB being garbage-collected as | |
976 | * dirty. The dirty nodes are written next commit, after which the LEB is free | |
977 | * to be reused. | |
978 | * | |
979 | * This function returns %0 on success and a negative error code on failure. | |
980 | */ | |
981 | static int make_ltab_dirty(struct ubifs_info *c, int lnum, int offs) | |
982 | { | |
983 | if (lnum != c->ltab_lnum || offs != c->ltab_offs) | |
984 | return 0; /* This ltab node is obsolete */ | |
985 | if (!(c->lpt_drty_flgs & LTAB_DIRTY)) { | |
986 | c->lpt_drty_flgs |= LTAB_DIRTY; | |
987 | ubifs_add_lpt_dirt(c, c->ltab_lnum, c->ltab_sz); | |
988 | } | |
989 | return 0; | |
990 | } | |
991 | ||
992 | /** | |
993 | * make_lsave_dirty - make lsave node dirty. | |
994 | * @c: UBIFS file-system description object | |
995 | * @lnum: LEB number where lsave was written | |
996 | * @offs: offset where lsave was written | |
997 | * | |
998 | * This function is used by LPT garbage collection. LPT garbage collection is | |
999 | * used only for the "big" LPT model (c->big_lpt == 1). Garbage collection | |
1000 | * simply involves marking all the nodes in the LEB being garbage-collected as | |
1001 | * dirty. The dirty nodes are written next commit, after which the LEB is free | |
1002 | * to be reused. | |
1003 | * | |
1004 | * This function returns %0 on success and a negative error code on failure. | |
1005 | */ | |
1006 | static int make_lsave_dirty(struct ubifs_info *c, int lnum, int offs) | |
1007 | { | |
1008 | if (lnum != c->lsave_lnum || offs != c->lsave_offs) | |
1009 | return 0; /* This lsave node is obsolete */ | |
1010 | if (!(c->lpt_drty_flgs & LSAVE_DIRTY)) { | |
1011 | c->lpt_drty_flgs |= LSAVE_DIRTY; | |
1012 | ubifs_add_lpt_dirt(c, c->lsave_lnum, c->lsave_sz); | |
1013 | } | |
1014 | return 0; | |
1015 | } | |
1016 | ||
1017 | /** | |
1018 | * make_node_dirty - make node dirty. | |
1019 | * @c: UBIFS file-system description object | |
1020 | * @node_type: LPT node type | |
1021 | * @node_num: node number | |
1022 | * @lnum: LEB number where node was written | |
1023 | * @offs: offset where node was written | |
1024 | * | |
1025 | * This function is used by LPT garbage collection. LPT garbage collection is | |
1026 | * used only for the "big" LPT model (c->big_lpt == 1). Garbage collection | |
1027 | * simply involves marking all the nodes in the LEB being garbage-collected as | |
1028 | * dirty. The dirty nodes are written next commit, after which the LEB is free | |
1029 | * to be reused. | |
1030 | * | |
1031 | * This function returns %0 on success and a negative error code on failure. | |
1032 | */ | |
1033 | static int make_node_dirty(struct ubifs_info *c, int node_type, int node_num, | |
1034 | int lnum, int offs) | |
1035 | { | |
1036 | switch (node_type) { | |
1037 | case UBIFS_LPT_NNODE: | |
1038 | return make_nnode_dirty(c, node_num, lnum, offs); | |
1039 | case UBIFS_LPT_PNODE: | |
1040 | return make_pnode_dirty(c, node_num, lnum, offs); | |
1041 | case UBIFS_LPT_LTAB: | |
1042 | return make_ltab_dirty(c, lnum, offs); | |
1043 | case UBIFS_LPT_LSAVE: | |
1044 | return make_lsave_dirty(c, lnum, offs); | |
1045 | } | |
1046 | return -EINVAL; | |
1047 | } | |
1048 | ||
1049 | /** | |
1050 | * get_lpt_node_len - return the length of a node based on its type. | |
1051 | * @c: UBIFS file-system description object | |
1052 | * @node_type: LPT node type | |
1053 | */ | |
2ba5f7ae | 1054 | static int get_lpt_node_len(const struct ubifs_info *c, int node_type) |
1e51764a AB |
1055 | { |
1056 | switch (node_type) { | |
1057 | case UBIFS_LPT_NNODE: | |
1058 | return c->nnode_sz; | |
1059 | case UBIFS_LPT_PNODE: | |
1060 | return c->pnode_sz; | |
1061 | case UBIFS_LPT_LTAB: | |
1062 | return c->ltab_sz; | |
1063 | case UBIFS_LPT_LSAVE: | |
1064 | return c->lsave_sz; | |
1065 | } | |
1066 | return 0; | |
1067 | } | |
1068 | ||
1069 | /** | |
1070 | * get_pad_len - return the length of padding in a buffer. | |
1071 | * @c: UBIFS file-system description object | |
1072 | * @buf: buffer | |
1073 | * @len: length of buffer | |
1074 | */ | |
2ba5f7ae | 1075 | static int get_pad_len(const struct ubifs_info *c, uint8_t *buf, int len) |
1e51764a AB |
1076 | { |
1077 | int offs, pad_len; | |
1078 | ||
1079 | if (c->min_io_size == 1) | |
1080 | return 0; | |
1081 | offs = c->leb_size - len; | |
1082 | pad_len = ALIGN(offs, c->min_io_size) - offs; | |
1083 | return pad_len; | |
1084 | } | |
1085 | ||
1086 | /** | |
1087 | * get_lpt_node_type - return type (and node number) of a node in a buffer. | |
1088 | * @c: UBIFS file-system description object | |
1089 | * @buf: buffer | |
1090 | * @node_num: node number is returned here | |
1091 | */ | |
2ba5f7ae AB |
1092 | static int get_lpt_node_type(const struct ubifs_info *c, uint8_t *buf, |
1093 | int *node_num) | |
1e51764a AB |
1094 | { |
1095 | uint8_t *addr = buf + UBIFS_LPT_CRC_BYTES; | |
1096 | int pos = 0, node_type; | |
1097 | ||
1098 | node_type = ubifs_unpack_bits(&addr, &pos, UBIFS_LPT_TYPE_BITS); | |
1099 | *node_num = ubifs_unpack_bits(&addr, &pos, c->pcnt_bits); | |
1100 | return node_type; | |
1101 | } | |
1102 | ||
1103 | /** | |
1104 | * is_a_node - determine if a buffer contains a node. | |
1105 | * @c: UBIFS file-system description object | |
1106 | * @buf: buffer | |
1107 | * @len: length of buffer | |
1108 | * | |
1109 | * This function returns %1 if the buffer contains a node or %0 if it does not. | |
1110 | */ | |
2ba5f7ae | 1111 | static int is_a_node(const struct ubifs_info *c, uint8_t *buf, int len) |
1e51764a AB |
1112 | { |
1113 | uint8_t *addr = buf + UBIFS_LPT_CRC_BYTES; | |
1114 | int pos = 0, node_type, node_len; | |
1115 | uint16_t crc, calc_crc; | |
1116 | ||
be2f6bd6 AH |
1117 | if (len < UBIFS_LPT_CRC_BYTES + (UBIFS_LPT_TYPE_BITS + 7) / 8) |
1118 | return 0; | |
1e51764a AB |
1119 | node_type = ubifs_unpack_bits(&addr, &pos, UBIFS_LPT_TYPE_BITS); |
1120 | if (node_type == UBIFS_LPT_NOT_A_NODE) | |
1121 | return 0; | |
1122 | node_len = get_lpt_node_len(c, node_type); | |
1123 | if (!node_len || node_len > len) | |
1124 | return 0; | |
1125 | pos = 0; | |
1126 | addr = buf; | |
1127 | crc = ubifs_unpack_bits(&addr, &pos, UBIFS_LPT_CRC_BITS); | |
1128 | calc_crc = crc16(-1, buf + UBIFS_LPT_CRC_BYTES, | |
1129 | node_len - UBIFS_LPT_CRC_BYTES); | |
1130 | if (crc != calc_crc) | |
1131 | return 0; | |
1132 | return 1; | |
1133 | } | |
1134 | ||
1e51764a AB |
1135 | /** |
1136 | * lpt_gc_lnum - garbage collect a LPT LEB. | |
1137 | * @c: UBIFS file-system description object | |
1138 | * @lnum: LEB number to garbage collect | |
1139 | * | |
1140 | * LPT garbage collection is used only for the "big" LPT model | |
1141 | * (c->big_lpt == 1). Garbage collection simply involves marking all the nodes | |
1142 | * in the LEB being garbage-collected as dirty. The dirty nodes are written | |
1143 | * next commit, after which the LEB is free to be reused. | |
1144 | * | |
1145 | * This function returns %0 on success and a negative error code on failure. | |
1146 | */ | |
1147 | static int lpt_gc_lnum(struct ubifs_info *c, int lnum) | |
1148 | { | |
1149 | int err, len = c->leb_size, node_type, node_num, node_len, offs; | |
1150 | void *buf = c->lpt_buf; | |
1151 | ||
1152 | dbg_lp("LEB %d", lnum); | |
1153 | err = ubi_read(c->ubi, lnum, buf, 0, c->leb_size); | |
1154 | if (err) { | |
1155 | ubifs_err("cannot read LEB %d, error %d", lnum, err); | |
1156 | return err; | |
1157 | } | |
1158 | while (1) { | |
1159 | if (!is_a_node(c, buf, len)) { | |
1160 | int pad_len; | |
1161 | ||
1162 | pad_len = get_pad_len(c, buf, len); | |
1163 | if (pad_len) { | |
1164 | buf += pad_len; | |
1165 | len -= pad_len; | |
1166 | continue; | |
1167 | } | |
1168 | return 0; | |
1169 | } | |
1170 | node_type = get_lpt_node_type(c, buf, &node_num); | |
1171 | node_len = get_lpt_node_len(c, node_type); | |
1172 | offs = c->leb_size - len; | |
1173 | ubifs_assert(node_len != 0); | |
1174 | mutex_lock(&c->lp_mutex); | |
1175 | err = make_node_dirty(c, node_type, node_num, lnum, offs); | |
1176 | mutex_unlock(&c->lp_mutex); | |
1177 | if (err) | |
1178 | return err; | |
1179 | buf += node_len; | |
1180 | len -= node_len; | |
1181 | } | |
1182 | return 0; | |
1183 | } | |
1184 | ||
1185 | /** | |
1186 | * lpt_gc - LPT garbage collection. | |
1187 | * @c: UBIFS file-system description object | |
1188 | * | |
1189 | * Select a LPT LEB for LPT garbage collection and call 'lpt_gc_lnum()'. | |
1190 | * Returns %0 on success and a negative error code on failure. | |
1191 | */ | |
1192 | static int lpt_gc(struct ubifs_info *c) | |
1193 | { | |
1194 | int i, lnum = -1, dirty = 0; | |
1195 | ||
1196 | mutex_lock(&c->lp_mutex); | |
1197 | for (i = 0; i < c->lpt_lebs; i++) { | |
1198 | ubifs_assert(!c->ltab[i].tgc); | |
1199 | if (i + c->lpt_first == c->nhead_lnum || | |
1200 | c->ltab[i].free + c->ltab[i].dirty == c->leb_size) | |
1201 | continue; | |
1202 | if (c->ltab[i].dirty > dirty) { | |
1203 | dirty = c->ltab[i].dirty; | |
1204 | lnum = i + c->lpt_first; | |
1205 | } | |
1206 | } | |
1207 | mutex_unlock(&c->lp_mutex); | |
1208 | if (lnum == -1) | |
1209 | return -ENOSPC; | |
1210 | return lpt_gc_lnum(c, lnum); | |
1211 | } | |
1212 | ||
1213 | /** | |
1214 | * ubifs_lpt_start_commit - UBIFS commit starts. | |
1215 | * @c: the UBIFS file-system description object | |
1216 | * | |
1217 | * This function has to be called when UBIFS starts the commit operation. | |
1218 | * This function "freezes" all currently dirty LEB properties and does not | |
1219 | * change them anymore. Further changes are saved and tracked separately | |
1220 | * because they are not part of this commit. This function returns zero in case | |
1221 | * of success and a negative error code in case of failure. | |
1222 | */ | |
1223 | int ubifs_lpt_start_commit(struct ubifs_info *c) | |
1224 | { | |
1225 | int err, cnt; | |
1226 | ||
1227 | dbg_lp(""); | |
1228 | ||
1229 | mutex_lock(&c->lp_mutex); | |
73944a6d AH |
1230 | err = dbg_chk_lpt_free_spc(c); |
1231 | if (err) | |
1232 | goto out; | |
1e51764a AB |
1233 | err = dbg_check_ltab(c); |
1234 | if (err) | |
1235 | goto out; | |
1236 | ||
1237 | if (c->check_lpt_free) { | |
1238 | /* | |
1239 | * We ensure there is enough free space in | |
1240 | * ubifs_lpt_post_commit() by marking nodes dirty. That | |
1241 | * information is lost when we unmount, so we also need | |
1242 | * to check free space once after mounting also. | |
1243 | */ | |
1244 | c->check_lpt_free = 0; | |
1245 | while (need_write_all(c)) { | |
1246 | mutex_unlock(&c->lp_mutex); | |
1247 | err = lpt_gc(c); | |
1248 | if (err) | |
1249 | return err; | |
1250 | mutex_lock(&c->lp_mutex); | |
1251 | } | |
1252 | } | |
1253 | ||
1254 | lpt_tgc_start(c); | |
1255 | ||
1256 | if (!c->dirty_pn_cnt) { | |
1257 | dbg_cmt("no cnodes to commit"); | |
1258 | err = 0; | |
1259 | goto out; | |
1260 | } | |
1261 | ||
1262 | if (!c->big_lpt && need_write_all(c)) { | |
1263 | /* If needed, write everything */ | |
1264 | err = make_tree_dirty(c); | |
1265 | if (err) | |
1266 | goto out; | |
1267 | lpt_tgc_start(c); | |
1268 | } | |
1269 | ||
1270 | if (c->big_lpt) | |
1271 | populate_lsave(c); | |
1272 | ||
1273 | cnt = get_cnodes_to_commit(c); | |
1274 | ubifs_assert(cnt != 0); | |
1275 | ||
1276 | err = layout_cnodes(c); | |
1277 | if (err) | |
1278 | goto out; | |
1279 | ||
1280 | /* Copy the LPT's own lprops for end commit to write */ | |
1281 | memcpy(c->ltab_cmt, c->ltab, | |
1282 | sizeof(struct ubifs_lpt_lprops) * c->lpt_lebs); | |
1283 | c->lpt_drty_flgs &= ~(LTAB_DIRTY | LSAVE_DIRTY); | |
1284 | ||
1285 | out: | |
1286 | mutex_unlock(&c->lp_mutex); | |
1287 | return err; | |
1288 | } | |
1289 | ||
1290 | /** | |
1291 | * free_obsolete_cnodes - free obsolete cnodes for commit end. | |
1292 | * @c: UBIFS file-system description object | |
1293 | */ | |
1294 | static void free_obsolete_cnodes(struct ubifs_info *c) | |
1295 | { | |
1296 | struct ubifs_cnode *cnode, *cnext; | |
1297 | ||
1298 | cnext = c->lpt_cnext; | |
1299 | if (!cnext) | |
1300 | return; | |
1301 | do { | |
1302 | cnode = cnext; | |
1303 | cnext = cnode->cnext; | |
1304 | if (test_bit(OBSOLETE_CNODE, &cnode->flags)) | |
1305 | kfree(cnode); | |
1306 | else | |
1307 | cnode->cnext = NULL; | |
1308 | } while (cnext != c->lpt_cnext); | |
1309 | c->lpt_cnext = NULL; | |
1310 | } | |
1311 | ||
1312 | /** | |
1313 | * ubifs_lpt_end_commit - finish the commit operation. | |
1314 | * @c: the UBIFS file-system description object | |
1315 | * | |
1316 | * This function has to be called when the commit operation finishes. It | |
1317 | * flushes the changes which were "frozen" by 'ubifs_lprops_start_commit()' to | |
1318 | * the media. Returns zero in case of success and a negative error code in case | |
1319 | * of failure. | |
1320 | */ | |
1321 | int ubifs_lpt_end_commit(struct ubifs_info *c) | |
1322 | { | |
1323 | int err; | |
1324 | ||
1325 | dbg_lp(""); | |
1326 | ||
1327 | if (!c->lpt_cnext) | |
1328 | return 0; | |
1329 | ||
1330 | err = write_cnodes(c); | |
1331 | if (err) | |
1332 | return err; | |
1333 | ||
1334 | mutex_lock(&c->lp_mutex); | |
1335 | free_obsolete_cnodes(c); | |
1336 | mutex_unlock(&c->lp_mutex); | |
1337 | ||
1338 | return 0; | |
1339 | } | |
1340 | ||
1341 | /** | |
1342 | * ubifs_lpt_post_commit - post commit LPT trivial GC and LPT GC. | |
1343 | * @c: UBIFS file-system description object | |
1344 | * | |
1345 | * LPT trivial GC is completed after a commit. Also LPT GC is done after a | |
1346 | * commit for the "big" LPT model. | |
1347 | */ | |
1348 | int ubifs_lpt_post_commit(struct ubifs_info *c) | |
1349 | { | |
1350 | int err; | |
1351 | ||
1352 | mutex_lock(&c->lp_mutex); | |
1353 | err = lpt_tgc_end(c); | |
1354 | if (err) | |
1355 | goto out; | |
1356 | if (c->big_lpt) | |
1357 | while (need_write_all(c)) { | |
1358 | mutex_unlock(&c->lp_mutex); | |
1359 | err = lpt_gc(c); | |
1360 | if (err) | |
1361 | return err; | |
1362 | mutex_lock(&c->lp_mutex); | |
1363 | } | |
1364 | out: | |
1365 | mutex_unlock(&c->lp_mutex); | |
1366 | return err; | |
1367 | } | |
1368 | ||
1369 | /** | |
1370 | * first_nnode - find the first nnode in memory. | |
1371 | * @c: UBIFS file-system description object | |
1372 | * @hght: height of tree where nnode found is returned here | |
1373 | * | |
1374 | * This function returns a pointer to the nnode found or %NULL if no nnode is | |
1375 | * found. This function is a helper to 'ubifs_lpt_free()'. | |
1376 | */ | |
1377 | static struct ubifs_nnode *first_nnode(struct ubifs_info *c, int *hght) | |
1378 | { | |
1379 | struct ubifs_nnode *nnode; | |
1380 | int h, i, found; | |
1381 | ||
1382 | nnode = c->nroot; | |
1383 | *hght = 0; | |
1384 | if (!nnode) | |
1385 | return NULL; | |
1386 | for (h = 1; h < c->lpt_hght; h++) { | |
1387 | found = 0; | |
1388 | for (i = 0; i < UBIFS_LPT_FANOUT; i++) { | |
1389 | if (nnode->nbranch[i].nnode) { | |
1390 | found = 1; | |
1391 | nnode = nnode->nbranch[i].nnode; | |
1392 | *hght = h; | |
1393 | break; | |
1394 | } | |
1395 | } | |
1396 | if (!found) | |
1397 | break; | |
1398 | } | |
1399 | return nnode; | |
1400 | } | |
1401 | ||
1402 | /** | |
1403 | * next_nnode - find the next nnode in memory. | |
1404 | * @c: UBIFS file-system description object | |
1405 | * @nnode: nnode from which to start. | |
1406 | * @hght: height of tree where nnode is, is passed and returned here | |
1407 | * | |
1408 | * This function returns a pointer to the nnode found or %NULL if no nnode is | |
1409 | * found. This function is a helper to 'ubifs_lpt_free()'. | |
1410 | */ | |
1411 | static struct ubifs_nnode *next_nnode(struct ubifs_info *c, | |
1412 | struct ubifs_nnode *nnode, int *hght) | |
1413 | { | |
1414 | struct ubifs_nnode *parent; | |
1415 | int iip, h, i, found; | |
1416 | ||
1417 | parent = nnode->parent; | |
1418 | if (!parent) | |
1419 | return NULL; | |
1420 | if (nnode->iip == UBIFS_LPT_FANOUT - 1) { | |
1421 | *hght -= 1; | |
1422 | return parent; | |
1423 | } | |
1424 | for (iip = nnode->iip + 1; iip < UBIFS_LPT_FANOUT; iip++) { | |
1425 | nnode = parent->nbranch[iip].nnode; | |
1426 | if (nnode) | |
1427 | break; | |
1428 | } | |
1429 | if (!nnode) { | |
1430 | *hght -= 1; | |
1431 | return parent; | |
1432 | } | |
1433 | for (h = *hght + 1; h < c->lpt_hght; h++) { | |
1434 | found = 0; | |
1435 | for (i = 0; i < UBIFS_LPT_FANOUT; i++) { | |
1436 | if (nnode->nbranch[i].nnode) { | |
1437 | found = 1; | |
1438 | nnode = nnode->nbranch[i].nnode; | |
1439 | *hght = h; | |
1440 | break; | |
1441 | } | |
1442 | } | |
1443 | if (!found) | |
1444 | break; | |
1445 | } | |
1446 | return nnode; | |
1447 | } | |
1448 | ||
1449 | /** | |
1450 | * ubifs_lpt_free - free resources owned by the LPT. | |
1451 | * @c: UBIFS file-system description object | |
1452 | * @wr_only: free only resources used for writing | |
1453 | */ | |
1454 | void ubifs_lpt_free(struct ubifs_info *c, int wr_only) | |
1455 | { | |
1456 | struct ubifs_nnode *nnode; | |
1457 | int i, hght; | |
1458 | ||
1459 | /* Free write-only things first */ | |
1460 | ||
1461 | free_obsolete_cnodes(c); /* Leftover from a failed commit */ | |
1462 | ||
1463 | vfree(c->ltab_cmt); | |
1464 | c->ltab_cmt = NULL; | |
1465 | vfree(c->lpt_buf); | |
1466 | c->lpt_buf = NULL; | |
1467 | kfree(c->lsave); | |
1468 | c->lsave = NULL; | |
1469 | ||
1470 | if (wr_only) | |
1471 | return; | |
1472 | ||
1473 | /* Now free the rest */ | |
1474 | ||
1475 | nnode = first_nnode(c, &hght); | |
1476 | while (nnode) { | |
1477 | for (i = 0; i < UBIFS_LPT_FANOUT; i++) | |
1478 | kfree(nnode->nbranch[i].nnode); | |
1479 | nnode = next_nnode(c, nnode, &hght); | |
1480 | } | |
1481 | for (i = 0; i < LPROPS_HEAP_CNT; i++) | |
1482 | kfree(c->lpt_heap[i].arr); | |
1483 | kfree(c->dirty_idx.arr); | |
1484 | kfree(c->nroot); | |
1485 | vfree(c->ltab); | |
1486 | kfree(c->lpt_nod_buf); | |
1487 | } | |
1488 | ||
1489 | #ifdef CONFIG_UBIFS_FS_DEBUG | |
1490 | ||
1491 | /** | |
80736d41 | 1492 | * dbg_is_all_ff - determine if a buffer contains only 0xFF bytes. |
1e51764a AB |
1493 | * @buf: buffer |
1494 | * @len: buffer length | |
1495 | */ | |
1496 | static int dbg_is_all_ff(uint8_t *buf, int len) | |
1497 | { | |
1498 | int i; | |
1499 | ||
1500 | for (i = 0; i < len; i++) | |
1501 | if (buf[i] != 0xff) | |
1502 | return 0; | |
1503 | return 1; | |
1504 | } | |
1505 | ||
1506 | /** | |
1507 | * dbg_is_nnode_dirty - determine if a nnode is dirty. | |
1508 | * @c: the UBIFS file-system description object | |
1509 | * @lnum: LEB number where nnode was written | |
1510 | * @offs: offset where nnode was written | |
1511 | */ | |
1512 | static int dbg_is_nnode_dirty(struct ubifs_info *c, int lnum, int offs) | |
1513 | { | |
1514 | struct ubifs_nnode *nnode; | |
1515 | int hght; | |
1516 | ||
80736d41 | 1517 | /* Entire tree is in memory so first_nnode / next_nnode are OK */ |
1e51764a AB |
1518 | nnode = first_nnode(c, &hght); |
1519 | for (; nnode; nnode = next_nnode(c, nnode, &hght)) { | |
1520 | struct ubifs_nbranch *branch; | |
1521 | ||
1522 | cond_resched(); | |
1523 | if (nnode->parent) { | |
1524 | branch = &nnode->parent->nbranch[nnode->iip]; | |
1525 | if (branch->lnum != lnum || branch->offs != offs) | |
1526 | continue; | |
1527 | if (test_bit(DIRTY_CNODE, &nnode->flags)) | |
1528 | return 1; | |
1529 | return 0; | |
1530 | } else { | |
1531 | if (c->lpt_lnum != lnum || c->lpt_offs != offs) | |
1532 | continue; | |
1533 | if (test_bit(DIRTY_CNODE, &nnode->flags)) | |
1534 | return 1; | |
1535 | return 0; | |
1536 | } | |
1537 | } | |
1538 | return 1; | |
1539 | } | |
1540 | ||
1541 | /** | |
1542 | * dbg_is_pnode_dirty - determine if a pnode is dirty. | |
1543 | * @c: the UBIFS file-system description object | |
1544 | * @lnum: LEB number where pnode was written | |
1545 | * @offs: offset where pnode was written | |
1546 | */ | |
1547 | static int dbg_is_pnode_dirty(struct ubifs_info *c, int lnum, int offs) | |
1548 | { | |
1549 | int i, cnt; | |
1550 | ||
1551 | cnt = DIV_ROUND_UP(c->main_lebs, UBIFS_LPT_FANOUT); | |
1552 | for (i = 0; i < cnt; i++) { | |
1553 | struct ubifs_pnode *pnode; | |
1554 | struct ubifs_nbranch *branch; | |
1555 | ||
1556 | cond_resched(); | |
1557 | pnode = pnode_lookup(c, i); | |
1558 | if (IS_ERR(pnode)) | |
1559 | return PTR_ERR(pnode); | |
1560 | branch = &pnode->parent->nbranch[pnode->iip]; | |
1561 | if (branch->lnum != lnum || branch->offs != offs) | |
1562 | continue; | |
1563 | if (test_bit(DIRTY_CNODE, &pnode->flags)) | |
1564 | return 1; | |
1565 | return 0; | |
1566 | } | |
1567 | return 1; | |
1568 | } | |
1569 | ||
1570 | /** | |
1571 | * dbg_is_ltab_dirty - determine if a ltab node is dirty. | |
1572 | * @c: the UBIFS file-system description object | |
1573 | * @lnum: LEB number where ltab node was written | |
1574 | * @offs: offset where ltab node was written | |
1575 | */ | |
1576 | static int dbg_is_ltab_dirty(struct ubifs_info *c, int lnum, int offs) | |
1577 | { | |
1578 | if (lnum != c->ltab_lnum || offs != c->ltab_offs) | |
1579 | return 1; | |
1580 | return (c->lpt_drty_flgs & LTAB_DIRTY) != 0; | |
1581 | } | |
1582 | ||
1583 | /** | |
1584 | * dbg_is_lsave_dirty - determine if a lsave node is dirty. | |
1585 | * @c: the UBIFS file-system description object | |
1586 | * @lnum: LEB number where lsave node was written | |
1587 | * @offs: offset where lsave node was written | |
1588 | */ | |
1589 | static int dbg_is_lsave_dirty(struct ubifs_info *c, int lnum, int offs) | |
1590 | { | |
1591 | if (lnum != c->lsave_lnum || offs != c->lsave_offs) | |
1592 | return 1; | |
1593 | return (c->lpt_drty_flgs & LSAVE_DIRTY) != 0; | |
1594 | } | |
1595 | ||
1596 | /** | |
1597 | * dbg_is_node_dirty - determine if a node is dirty. | |
1598 | * @c: the UBIFS file-system description object | |
1599 | * @node_type: node type | |
1600 | * @lnum: LEB number where node was written | |
1601 | * @offs: offset where node was written | |
1602 | */ | |
1603 | static int dbg_is_node_dirty(struct ubifs_info *c, int node_type, int lnum, | |
1604 | int offs) | |
1605 | { | |
1606 | switch (node_type) { | |
1607 | case UBIFS_LPT_NNODE: | |
1608 | return dbg_is_nnode_dirty(c, lnum, offs); | |
1609 | case UBIFS_LPT_PNODE: | |
1610 | return dbg_is_pnode_dirty(c, lnum, offs); | |
1611 | case UBIFS_LPT_LTAB: | |
1612 | return dbg_is_ltab_dirty(c, lnum, offs); | |
1613 | case UBIFS_LPT_LSAVE: | |
1614 | return dbg_is_lsave_dirty(c, lnum, offs); | |
1615 | } | |
1616 | return 1; | |
1617 | } | |
1618 | ||
1619 | /** | |
1620 | * dbg_check_ltab_lnum - check the ltab for a LPT LEB number. | |
1621 | * @c: the UBIFS file-system description object | |
1622 | * @lnum: LEB number where node was written | |
1623 | * @offs: offset where node was written | |
1624 | * | |
1625 | * This function returns %0 on success and a negative error code on failure. | |
1626 | */ | |
1627 | static int dbg_check_ltab_lnum(struct ubifs_info *c, int lnum) | |
1628 | { | |
1629 | int err, len = c->leb_size, dirty = 0, node_type, node_num, node_len; | |
1630 | int ret; | |
6fb324a4 | 1631 | void *buf, *p; |
1e51764a | 1632 | |
45e12d90 AB |
1633 | if (!(ubifs_chk_flags & UBIFS_CHK_LPROPS)) |
1634 | return 0; | |
1635 | ||
fc5e58c0 | 1636 | buf = p = __vmalloc(c->leb_size, GFP_NOFS, PAGE_KERNEL); |
6fb324a4 AB |
1637 | if (!buf) { |
1638 | ubifs_err("cannot allocate memory for ltab checking"); | |
1639 | return 0; | |
1640 | } | |
1641 | ||
1e51764a AB |
1642 | dbg_lp("LEB %d", lnum); |
1643 | err = ubi_read(c->ubi, lnum, buf, 0, c->leb_size); | |
1644 | if (err) { | |
1645 | dbg_msg("ubi_read failed, LEB %d, error %d", lnum, err); | |
6fb324a4 | 1646 | goto out; |
1e51764a AB |
1647 | } |
1648 | while (1) { | |
6fb324a4 | 1649 | if (!is_a_node(c, p, len)) { |
1e51764a AB |
1650 | int i, pad_len; |
1651 | ||
6fb324a4 | 1652 | pad_len = get_pad_len(c, p, len); |
1e51764a | 1653 | if (pad_len) { |
6fb324a4 | 1654 | p += pad_len; |
1e51764a AB |
1655 | len -= pad_len; |
1656 | dirty += pad_len; | |
1657 | continue; | |
1658 | } | |
6fb324a4 | 1659 | if (!dbg_is_all_ff(p, len)) { |
1e51764a AB |
1660 | dbg_msg("invalid empty space in LEB %d at %d", |
1661 | lnum, c->leb_size - len); | |
1662 | err = -EINVAL; | |
1663 | } | |
1664 | i = lnum - c->lpt_first; | |
1665 | if (len != c->ltab[i].free) { | |
1666 | dbg_msg("invalid free space in LEB %d " | |
1667 | "(free %d, expected %d)", | |
1668 | lnum, len, c->ltab[i].free); | |
1669 | err = -EINVAL; | |
1670 | } | |
1671 | if (dirty != c->ltab[i].dirty) { | |
1672 | dbg_msg("invalid dirty space in LEB %d " | |
1673 | "(dirty %d, expected %d)", | |
1674 | lnum, dirty, c->ltab[i].dirty); | |
1675 | err = -EINVAL; | |
1676 | } | |
6fb324a4 | 1677 | goto out; |
1e51764a | 1678 | } |
6fb324a4 | 1679 | node_type = get_lpt_node_type(c, p, &node_num); |
1e51764a AB |
1680 | node_len = get_lpt_node_len(c, node_type); |
1681 | ret = dbg_is_node_dirty(c, node_type, lnum, c->leb_size - len); | |
1682 | if (ret == 1) | |
1683 | dirty += node_len; | |
6fb324a4 | 1684 | p += node_len; |
1e51764a AB |
1685 | len -= node_len; |
1686 | } | |
6fb324a4 AB |
1687 | |
1688 | err = 0; | |
1689 | out: | |
1690 | vfree(buf); | |
1691 | return err; | |
1e51764a AB |
1692 | } |
1693 | ||
1694 | /** | |
1695 | * dbg_check_ltab - check the free and dirty space in the ltab. | |
1696 | * @c: the UBIFS file-system description object | |
1697 | * | |
1698 | * This function returns %0 on success and a negative error code on failure. | |
1699 | */ | |
1700 | int dbg_check_ltab(struct ubifs_info *c) | |
1701 | { | |
1702 | int lnum, err, i, cnt; | |
1703 | ||
1704 | if (!(ubifs_chk_flags & UBIFS_CHK_LPROPS)) | |
1705 | return 0; | |
1706 | ||
1707 | /* Bring the entire tree into memory */ | |
1708 | cnt = DIV_ROUND_UP(c->main_lebs, UBIFS_LPT_FANOUT); | |
1709 | for (i = 0; i < cnt; i++) { | |
1710 | struct ubifs_pnode *pnode; | |
1711 | ||
1712 | pnode = pnode_lookup(c, i); | |
1713 | if (IS_ERR(pnode)) | |
1714 | return PTR_ERR(pnode); | |
1715 | cond_resched(); | |
1716 | } | |
1717 | ||
1718 | /* Check nodes */ | |
1719 | err = dbg_check_lpt_nodes(c, (struct ubifs_cnode *)c->nroot, 0, 0); | |
1720 | if (err) | |
1721 | return err; | |
1722 | ||
1723 | /* Check each LEB */ | |
1724 | for (lnum = c->lpt_first; lnum <= c->lpt_last; lnum++) { | |
1725 | err = dbg_check_ltab_lnum(c, lnum); | |
1726 | if (err) { | |
1727 | dbg_err("failed at LEB %d", lnum); | |
1728 | return err; | |
1729 | } | |
1730 | } | |
1731 | ||
1732 | dbg_lp("succeeded"); | |
1733 | return 0; | |
1734 | } | |
1735 | ||
73944a6d AH |
1736 | /** |
1737 | * dbg_chk_lpt_free_spc - check LPT free space is enough to write entire LPT. | |
1738 | * @c: the UBIFS file-system description object | |
1739 | * | |
1740 | * This function returns %0 on success and a negative error code on failure. | |
1741 | */ | |
1742 | int dbg_chk_lpt_free_spc(struct ubifs_info *c) | |
1743 | { | |
1744 | long long free = 0; | |
1745 | int i; | |
1746 | ||
45e12d90 AB |
1747 | if (!(ubifs_chk_flags & UBIFS_CHK_LPROPS)) |
1748 | return 0; | |
1749 | ||
73944a6d AH |
1750 | for (i = 0; i < c->lpt_lebs; i++) { |
1751 | if (c->ltab[i].tgc || c->ltab[i].cmt) | |
1752 | continue; | |
1753 | if (i + c->lpt_first == c->nhead_lnum) | |
1754 | free += c->leb_size - c->nhead_offs; | |
1755 | else if (c->ltab[i].free == c->leb_size) | |
1756 | free += c->leb_size; | |
1757 | } | |
1758 | if (free < c->lpt_sz) { | |
1759 | dbg_err("LPT space error: free %lld lpt_sz %lld", | |
1760 | free, c->lpt_sz); | |
1761 | dbg_dump_lpt_info(c); | |
2ba5f7ae | 1762 | dbg_dump_lpt_lebs(c); |
787845bd | 1763 | dump_stack(); |
73944a6d AH |
1764 | return -EINVAL; |
1765 | } | |
1766 | return 0; | |
1767 | } | |
1768 | ||
1769 | /** | |
1770 | * dbg_chk_lpt_sz - check LPT does not write more than LPT size. | |
1771 | * @c: the UBIFS file-system description object | |
2bc275e9 | 1772 | * @action: what to do |
73944a6d AH |
1773 | * @len: length written |
1774 | * | |
1775 | * This function returns %0 on success and a negative error code on failure. | |
2bc275e9 AH |
1776 | * The @action argument may be one of: |
1777 | * o %0 - LPT debugging checking starts, initialize debugging variables; | |
1778 | * o %1 - wrote an LPT node, increase LPT size by @len bytes; | |
1779 | * o %2 - switched to a different LEB and wasted @len bytes; | |
1780 | * o %3 - check that we've written the right number of bytes. | |
1781 | * o %4 - wasted @len bytes; | |
73944a6d AH |
1782 | */ |
1783 | int dbg_chk_lpt_sz(struct ubifs_info *c, int action, int len) | |
1784 | { | |
17c2f9f8 | 1785 | struct ubifs_debug_info *d = c->dbg; |
73944a6d AH |
1786 | long long chk_lpt_sz, lpt_sz; |
1787 | int err = 0; | |
1788 | ||
45e12d90 AB |
1789 | if (!(ubifs_chk_flags & UBIFS_CHK_LPROPS)) |
1790 | return 0; | |
1791 | ||
73944a6d AH |
1792 | switch (action) { |
1793 | case 0: | |
17c2f9f8 AB |
1794 | d->chk_lpt_sz = 0; |
1795 | d->chk_lpt_sz2 = 0; | |
1796 | d->chk_lpt_lebs = 0; | |
1797 | d->chk_lpt_wastage = 0; | |
73944a6d AH |
1798 | if (c->dirty_pn_cnt > c->pnode_cnt) { |
1799 | dbg_err("dirty pnodes %d exceed max %d", | |
1800 | c->dirty_pn_cnt, c->pnode_cnt); | |
1801 | err = -EINVAL; | |
1802 | } | |
1803 | if (c->dirty_nn_cnt > c->nnode_cnt) { | |
1804 | dbg_err("dirty nnodes %d exceed max %d", | |
1805 | c->dirty_nn_cnt, c->nnode_cnt); | |
1806 | err = -EINVAL; | |
1807 | } | |
1808 | return err; | |
1809 | case 1: | |
17c2f9f8 | 1810 | d->chk_lpt_sz += len; |
73944a6d AH |
1811 | return 0; |
1812 | case 2: | |
17c2f9f8 AB |
1813 | d->chk_lpt_sz += len; |
1814 | d->chk_lpt_wastage += len; | |
1815 | d->chk_lpt_lebs += 1; | |
73944a6d AH |
1816 | return 0; |
1817 | case 3: | |
1818 | chk_lpt_sz = c->leb_size; | |
17c2f9f8 | 1819 | chk_lpt_sz *= d->chk_lpt_lebs; |
73944a6d | 1820 | chk_lpt_sz += len - c->nhead_offs; |
17c2f9f8 | 1821 | if (d->chk_lpt_sz != chk_lpt_sz) { |
73944a6d | 1822 | dbg_err("LPT wrote %lld but space used was %lld", |
17c2f9f8 | 1823 | d->chk_lpt_sz, chk_lpt_sz); |
73944a6d AH |
1824 | err = -EINVAL; |
1825 | } | |
17c2f9f8 | 1826 | if (d->chk_lpt_sz > c->lpt_sz) { |
73944a6d | 1827 | dbg_err("LPT wrote %lld but lpt_sz is %lld", |
17c2f9f8 | 1828 | d->chk_lpt_sz, c->lpt_sz); |
73944a6d AH |
1829 | err = -EINVAL; |
1830 | } | |
17c2f9f8 | 1831 | if (d->chk_lpt_sz2 && d->chk_lpt_sz != d->chk_lpt_sz2) { |
73944a6d | 1832 | dbg_err("LPT layout size %lld but wrote %lld", |
17c2f9f8 | 1833 | d->chk_lpt_sz, d->chk_lpt_sz2); |
73944a6d AH |
1834 | err = -EINVAL; |
1835 | } | |
17c2f9f8 | 1836 | if (d->chk_lpt_sz2 && d->new_nhead_offs != len) { |
73944a6d | 1837 | dbg_err("LPT new nhead offs: expected %d was %d", |
17c2f9f8 | 1838 | d->new_nhead_offs, len); |
73944a6d AH |
1839 | err = -EINVAL; |
1840 | } | |
1841 | lpt_sz = (long long)c->pnode_cnt * c->pnode_sz; | |
1842 | lpt_sz += (long long)c->nnode_cnt * c->nnode_sz; | |
1843 | lpt_sz += c->ltab_sz; | |
1844 | if (c->big_lpt) | |
1845 | lpt_sz += c->lsave_sz; | |
17c2f9f8 | 1846 | if (d->chk_lpt_sz - d->chk_lpt_wastage > lpt_sz) { |
73944a6d | 1847 | dbg_err("LPT chk_lpt_sz %lld + waste %lld exceeds %lld", |
17c2f9f8 | 1848 | d->chk_lpt_sz, d->chk_lpt_wastage, lpt_sz); |
73944a6d AH |
1849 | err = -EINVAL; |
1850 | } | |
787845bd | 1851 | if (err) { |
73944a6d | 1852 | dbg_dump_lpt_info(c); |
2ba5f7ae | 1853 | dbg_dump_lpt_lebs(c); |
787845bd AB |
1854 | dump_stack(); |
1855 | } | |
17c2f9f8 AB |
1856 | d->chk_lpt_sz2 = d->chk_lpt_sz; |
1857 | d->chk_lpt_sz = 0; | |
1858 | d->chk_lpt_wastage = 0; | |
1859 | d->chk_lpt_lebs = 0; | |
1860 | d->new_nhead_offs = len; | |
73944a6d AH |
1861 | return err; |
1862 | case 4: | |
17c2f9f8 AB |
1863 | d->chk_lpt_sz += len; |
1864 | d->chk_lpt_wastage += len; | |
73944a6d AH |
1865 | return 0; |
1866 | default: | |
1867 | return -EINVAL; | |
1868 | } | |
1869 | } | |
1870 | ||
2ba5f7ae AB |
1871 | /** |
1872 | * dbg_dump_lpt_leb - dump an LPT LEB. | |
1873 | * @c: UBIFS file-system description object | |
1874 | * @lnum: LEB number to dump | |
1875 | * | |
1876 | * This function dumps an LEB from LPT area. Nodes in this area are very | |
1877 | * different to nodes in the main area (e.g., they do not have common headers, | |
1878 | * they do not have 8-byte alignments, etc), so we have a separate function to | |
80736d41 | 1879 | * dump LPT area LEBs. Note, LPT has to be locked by the caller. |
2ba5f7ae AB |
1880 | */ |
1881 | static void dump_lpt_leb(const struct ubifs_info *c, int lnum) | |
1882 | { | |
1883 | int err, len = c->leb_size, node_type, node_num, node_len, offs; | |
cab95d44 | 1884 | void *buf, *p; |
2ba5f7ae AB |
1885 | |
1886 | printk(KERN_DEBUG "(pid %d) start dumping LEB %d\n", | |
1887 | current->pid, lnum); | |
fc5e58c0 | 1888 | buf = p = __vmalloc(c->leb_size, GFP_NOFS, PAGE_KERNEL); |
cab95d44 AB |
1889 | if (!buf) { |
1890 | ubifs_err("cannot allocate memory to dump LPT"); | |
1891 | return; | |
1892 | } | |
1893 | ||
2ba5f7ae AB |
1894 | err = ubi_read(c->ubi, lnum, buf, 0, c->leb_size); |
1895 | if (err) { | |
1896 | ubifs_err("cannot read LEB %d, error %d", lnum, err); | |
cab95d44 | 1897 | goto out; |
2ba5f7ae AB |
1898 | } |
1899 | while (1) { | |
1900 | offs = c->leb_size - len; | |
cab95d44 | 1901 | if (!is_a_node(c, p, len)) { |
2ba5f7ae AB |
1902 | int pad_len; |
1903 | ||
cab95d44 | 1904 | pad_len = get_pad_len(c, p, len); |
2ba5f7ae AB |
1905 | if (pad_len) { |
1906 | printk(KERN_DEBUG "LEB %d:%d, pad %d bytes\n", | |
1907 | lnum, offs, pad_len); | |
cab95d44 | 1908 | p += pad_len; |
2ba5f7ae AB |
1909 | len -= pad_len; |
1910 | continue; | |
1911 | } | |
1912 | if (len) | |
1913 | printk(KERN_DEBUG "LEB %d:%d, free %d bytes\n", | |
1914 | lnum, offs, len); | |
1915 | break; | |
1916 | } | |
1917 | ||
cab95d44 | 1918 | node_type = get_lpt_node_type(c, p, &node_num); |
2ba5f7ae AB |
1919 | switch (node_type) { |
1920 | case UBIFS_LPT_PNODE: | |
1921 | { | |
1922 | node_len = c->pnode_sz; | |
1923 | if (c->big_lpt) | |
1924 | printk(KERN_DEBUG "LEB %d:%d, pnode num %d\n", | |
1925 | lnum, offs, node_num); | |
1926 | else | |
1927 | printk(KERN_DEBUG "LEB %d:%d, pnode\n", | |
1928 | lnum, offs); | |
1929 | break; | |
1930 | } | |
1931 | case UBIFS_LPT_NNODE: | |
1932 | { | |
1933 | int i; | |
1934 | struct ubifs_nnode nnode; | |
1935 | ||
1936 | node_len = c->nnode_sz; | |
1937 | if (c->big_lpt) | |
1938 | printk(KERN_DEBUG "LEB %d:%d, nnode num %d, ", | |
1939 | lnum, offs, node_num); | |
1940 | else | |
1941 | printk(KERN_DEBUG "LEB %d:%d, nnode, ", | |
1942 | lnum, offs); | |
cab95d44 | 1943 | err = ubifs_unpack_nnode(c, p, &nnode); |
2ba5f7ae | 1944 | for (i = 0; i < UBIFS_LPT_FANOUT; i++) { |
c9927c3e | 1945 | printk(KERN_CONT "%d:%d", nnode.nbranch[i].lnum, |
2ba5f7ae AB |
1946 | nnode.nbranch[i].offs); |
1947 | if (i != UBIFS_LPT_FANOUT - 1) | |
c9927c3e | 1948 | printk(KERN_CONT ", "); |
2ba5f7ae | 1949 | } |
c9927c3e | 1950 | printk(KERN_CONT "\n"); |
2ba5f7ae AB |
1951 | break; |
1952 | } | |
1953 | case UBIFS_LPT_LTAB: | |
1954 | node_len = c->ltab_sz; | |
1955 | printk(KERN_DEBUG "LEB %d:%d, ltab\n", | |
1956 | lnum, offs); | |
1957 | break; | |
1958 | case UBIFS_LPT_LSAVE: | |
1959 | node_len = c->lsave_sz; | |
1960 | printk(KERN_DEBUG "LEB %d:%d, lsave len\n", lnum, offs); | |
1961 | break; | |
1962 | default: | |
1963 | ubifs_err("LPT node type %d not recognized", node_type); | |
cab95d44 | 1964 | goto out; |
2ba5f7ae AB |
1965 | } |
1966 | ||
cab95d44 | 1967 | p += node_len; |
2ba5f7ae AB |
1968 | len -= node_len; |
1969 | } | |
1970 | ||
1971 | printk(KERN_DEBUG "(pid %d) finish dumping LEB %d\n", | |
1972 | current->pid, lnum); | |
cab95d44 AB |
1973 | out: |
1974 | vfree(buf); | |
1975 | return; | |
2ba5f7ae AB |
1976 | } |
1977 | ||
1978 | /** | |
1979 | * dbg_dump_lpt_lebs - dump LPT lebs. | |
1980 | * @c: UBIFS file-system description object | |
1981 | * | |
1982 | * This function dumps all LPT LEBs. The caller has to make sure the LPT is | |
1983 | * locked. | |
1984 | */ | |
1985 | void dbg_dump_lpt_lebs(const struct ubifs_info *c) | |
1986 | { | |
1987 | int i; | |
1988 | ||
1989 | printk(KERN_DEBUG "(pid %d) start dumping all LPT LEBs\n", | |
1990 | current->pid); | |
1991 | for (i = 0; i < c->lpt_lebs; i++) | |
1992 | dump_lpt_leb(c, i + c->lpt_first); | |
1993 | printk(KERN_DEBUG "(pid %d) finish dumping all LPT LEBs\n", | |
1994 | current->pid); | |
1995 | } | |
1996 | ||
1e51764a | 1997 | #endif /* CONFIG_UBIFS_FS_DEBUG */ |