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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 the LEB properties tree (LPT) area. The LPT area | |
25 | * contains the LEB properties tree, a table of LPT area eraseblocks (ltab), and | |
26 | * (for the "big" model) a table of saved LEB numbers (lsave). The LPT area sits | |
27 | * between the log and the orphan area. | |
28 | * | |
29 | * The LPT area is like a miniature self-contained file system. It is required | |
30 | * that it never runs out of space, is fast to access and update, and scales | |
31 | * logarithmically. The LEB properties tree is implemented as a wandering tree | |
32 | * much like the TNC, and the LPT area has its own garbage collection. | |
33 | * | |
34 | * The LPT has two slightly different forms called the "small model" and the | |
35 | * "big model". The small model is used when the entire LEB properties table | |
36 | * can be written into a single eraseblock. In that case, garbage collection | |
37 | * consists of just writing the whole table, which therefore makes all other | |
38 | * eraseblocks reusable. In the case of the big model, dirty eraseblocks are | |
45e12d90 | 39 | * selected for garbage collection, which consists of marking the clean nodes in |
1e51764a AB |
40 | * that LEB as dirty, and then only the dirty nodes are written out. Also, in |
41 | * the case of the big model, a table of LEB numbers is saved so that the entire | |
42 | * LPT does not to be scanned looking for empty eraseblocks when UBIFS is first | |
43 | * mounted. | |
44 | */ | |
45 | ||
1e51764a | 46 | #include "ubifs.h" |
4d61db4f AB |
47 | #include <linux/crc16.h> |
48 | #include <linux/math64.h> | |
5a0e3ad6 | 49 | #include <linux/slab.h> |
1e51764a AB |
50 | |
51 | /** | |
52 | * do_calc_lpt_geom - calculate sizes for the LPT area. | |
53 | * @c: the UBIFS file-system description object | |
54 | * | |
55 | * Calculate the sizes of LPT bit fields, nodes, and tree, based on the | |
56 | * properties of the flash and whether LPT is "big" (c->big_lpt). | |
57 | */ | |
58 | static void do_calc_lpt_geom(struct ubifs_info *c) | |
59 | { | |
60 | int i, n, bits, per_leb_wastage, max_pnode_cnt; | |
61 | long long sz, tot_wastage; | |
62 | ||
63 | n = c->main_lebs + c->max_leb_cnt - c->leb_cnt; | |
64 | max_pnode_cnt = DIV_ROUND_UP(n, UBIFS_LPT_FANOUT); | |
65 | ||
66 | c->lpt_hght = 1; | |
67 | n = UBIFS_LPT_FANOUT; | |
68 | while (n < max_pnode_cnt) { | |
69 | c->lpt_hght += 1; | |
70 | n <<= UBIFS_LPT_FANOUT_SHIFT; | |
71 | } | |
72 | ||
73 | c->pnode_cnt = DIV_ROUND_UP(c->main_lebs, UBIFS_LPT_FANOUT); | |
74 | ||
75 | n = DIV_ROUND_UP(c->pnode_cnt, UBIFS_LPT_FANOUT); | |
76 | c->nnode_cnt = n; | |
77 | for (i = 1; i < c->lpt_hght; i++) { | |
78 | n = DIV_ROUND_UP(n, UBIFS_LPT_FANOUT); | |
79 | c->nnode_cnt += n; | |
80 | } | |
81 | ||
82 | c->space_bits = fls(c->leb_size) - 3; | |
83 | c->lpt_lnum_bits = fls(c->lpt_lebs); | |
84 | c->lpt_offs_bits = fls(c->leb_size - 1); | |
85 | c->lpt_spc_bits = fls(c->leb_size); | |
86 | ||
87 | n = DIV_ROUND_UP(c->max_leb_cnt, UBIFS_LPT_FANOUT); | |
88 | c->pcnt_bits = fls(n - 1); | |
89 | ||
90 | c->lnum_bits = fls(c->max_leb_cnt - 1); | |
91 | ||
92 | bits = UBIFS_LPT_CRC_BITS + UBIFS_LPT_TYPE_BITS + | |
93 | (c->big_lpt ? c->pcnt_bits : 0) + | |
94 | (c->space_bits * 2 + 1) * UBIFS_LPT_FANOUT; | |
95 | c->pnode_sz = (bits + 7) / 8; | |
96 | ||
97 | bits = UBIFS_LPT_CRC_BITS + UBIFS_LPT_TYPE_BITS + | |
98 | (c->big_lpt ? c->pcnt_bits : 0) + | |
99 | (c->lpt_lnum_bits + c->lpt_offs_bits) * UBIFS_LPT_FANOUT; | |
100 | c->nnode_sz = (bits + 7) / 8; | |
101 | ||
102 | bits = UBIFS_LPT_CRC_BITS + UBIFS_LPT_TYPE_BITS + | |
103 | c->lpt_lebs * c->lpt_spc_bits * 2; | |
104 | c->ltab_sz = (bits + 7) / 8; | |
105 | ||
106 | bits = UBIFS_LPT_CRC_BITS + UBIFS_LPT_TYPE_BITS + | |
107 | c->lnum_bits * c->lsave_cnt; | |
108 | c->lsave_sz = (bits + 7) / 8; | |
109 | ||
110 | /* Calculate the minimum LPT size */ | |
111 | c->lpt_sz = (long long)c->pnode_cnt * c->pnode_sz; | |
112 | c->lpt_sz += (long long)c->nnode_cnt * c->nnode_sz; | |
113 | c->lpt_sz += c->ltab_sz; | |
73944a6d AH |
114 | if (c->big_lpt) |
115 | c->lpt_sz += c->lsave_sz; | |
1e51764a AB |
116 | |
117 | /* Add wastage */ | |
118 | sz = c->lpt_sz; | |
119 | per_leb_wastage = max_t(int, c->pnode_sz, c->nnode_sz); | |
120 | sz += per_leb_wastage; | |
121 | tot_wastage = per_leb_wastage; | |
122 | while (sz > c->leb_size) { | |
123 | sz += per_leb_wastage; | |
124 | sz -= c->leb_size; | |
125 | tot_wastage += per_leb_wastage; | |
126 | } | |
127 | tot_wastage += ALIGN(sz, c->min_io_size) - sz; | |
128 | c->lpt_sz += tot_wastage; | |
129 | } | |
130 | ||
131 | /** | |
132 | * ubifs_calc_lpt_geom - calculate and check sizes for the LPT area. | |
133 | * @c: the UBIFS file-system description object | |
134 | * | |
135 | * This function returns %0 on success and a negative error code on failure. | |
136 | */ | |
137 | int ubifs_calc_lpt_geom(struct ubifs_info *c) | |
138 | { | |
139 | int lebs_needed; | |
4d61db4f | 140 | long long sz; |
1e51764a AB |
141 | |
142 | do_calc_lpt_geom(c); | |
143 | ||
144 | /* Verify that lpt_lebs is big enough */ | |
145 | sz = c->lpt_sz * 2; /* Must have at least 2 times the size */ | |
4d61db4f | 146 | lebs_needed = div_u64(sz + c->leb_size - 1, c->leb_size); |
1e51764a AB |
147 | if (lebs_needed > c->lpt_lebs) { |
148 | ubifs_err("too few LPT LEBs"); | |
149 | return -EINVAL; | |
150 | } | |
151 | ||
152 | /* Verify that ltab fits in a single LEB (since ltab is a single node */ | |
153 | if (c->ltab_sz > c->leb_size) { | |
154 | ubifs_err("LPT ltab too big"); | |
155 | return -EINVAL; | |
156 | } | |
157 | ||
158 | c->check_lpt_free = c->big_lpt; | |
1e51764a AB |
159 | return 0; |
160 | } | |
161 | ||
162 | /** | |
163 | * calc_dflt_lpt_geom - calculate default LPT geometry. | |
164 | * @c: the UBIFS file-system description object | |
165 | * @main_lebs: number of main area LEBs is passed and returned here | |
166 | * @big_lpt: whether the LPT area is "big" is returned here | |
167 | * | |
168 | * The size of the LPT area depends on parameters that themselves are dependent | |
169 | * on the size of the LPT area. This function, successively recalculates the LPT | |
170 | * area geometry until the parameters and resultant geometry are consistent. | |
171 | * | |
172 | * This function returns %0 on success and a negative error code on failure. | |
173 | */ | |
174 | static int calc_dflt_lpt_geom(struct ubifs_info *c, int *main_lebs, | |
175 | int *big_lpt) | |
176 | { | |
177 | int i, lebs_needed; | |
4d61db4f | 178 | long long sz; |
1e51764a AB |
179 | |
180 | /* Start by assuming the minimum number of LPT LEBs */ | |
181 | c->lpt_lebs = UBIFS_MIN_LPT_LEBS; | |
182 | c->main_lebs = *main_lebs - c->lpt_lebs; | |
183 | if (c->main_lebs <= 0) | |
184 | return -EINVAL; | |
185 | ||
186 | /* And assume we will use the small LPT model */ | |
187 | c->big_lpt = 0; | |
188 | ||
189 | /* | |
190 | * Calculate the geometry based on assumptions above and then see if it | |
191 | * makes sense | |
192 | */ | |
193 | do_calc_lpt_geom(c); | |
194 | ||
195 | /* Small LPT model must have lpt_sz < leb_size */ | |
196 | if (c->lpt_sz > c->leb_size) { | |
197 | /* Nope, so try again using big LPT model */ | |
198 | c->big_lpt = 1; | |
199 | do_calc_lpt_geom(c); | |
200 | } | |
201 | ||
202 | /* Now check there are enough LPT LEBs */ | |
203 | for (i = 0; i < 64 ; i++) { | |
204 | sz = c->lpt_sz * 4; /* Allow 4 times the size */ | |
4d61db4f | 205 | lebs_needed = div_u64(sz + c->leb_size - 1, c->leb_size); |
1e51764a AB |
206 | if (lebs_needed > c->lpt_lebs) { |
207 | /* Not enough LPT LEBs so try again with more */ | |
208 | c->lpt_lebs = lebs_needed; | |
209 | c->main_lebs = *main_lebs - c->lpt_lebs; | |
210 | if (c->main_lebs <= 0) | |
211 | return -EINVAL; | |
212 | do_calc_lpt_geom(c); | |
213 | continue; | |
214 | } | |
215 | if (c->ltab_sz > c->leb_size) { | |
216 | ubifs_err("LPT ltab too big"); | |
217 | return -EINVAL; | |
218 | } | |
219 | *main_lebs = c->main_lebs; | |
220 | *big_lpt = c->big_lpt; | |
221 | return 0; | |
222 | } | |
223 | return -EINVAL; | |
224 | } | |
225 | ||
226 | /** | |
227 | * pack_bits - pack bit fields end-to-end. | |
228 | * @addr: address at which to pack (passed and next address returned) | |
229 | * @pos: bit position at which to pack (passed and next position returned) | |
230 | * @val: value to pack | |
231 | * @nrbits: number of bits of value to pack (1-32) | |
232 | */ | |
233 | static void pack_bits(uint8_t **addr, int *pos, uint32_t val, int nrbits) | |
234 | { | |
235 | uint8_t *p = *addr; | |
236 | int b = *pos; | |
237 | ||
238 | ubifs_assert(nrbits > 0); | |
239 | ubifs_assert(nrbits <= 32); | |
240 | ubifs_assert(*pos >= 0); | |
241 | ubifs_assert(*pos < 8); | |
242 | ubifs_assert((val >> nrbits) == 0 || nrbits == 32); | |
243 | if (b) { | |
244 | *p |= ((uint8_t)val) << b; | |
245 | nrbits += b; | |
246 | if (nrbits > 8) { | |
247 | *++p = (uint8_t)(val >>= (8 - b)); | |
248 | if (nrbits > 16) { | |
249 | *++p = (uint8_t)(val >>= 8); | |
250 | if (nrbits > 24) { | |
251 | *++p = (uint8_t)(val >>= 8); | |
252 | if (nrbits > 32) | |
253 | *++p = (uint8_t)(val >>= 8); | |
254 | } | |
255 | } | |
256 | } | |
257 | } else { | |
258 | *p = (uint8_t)val; | |
259 | if (nrbits > 8) { | |
260 | *++p = (uint8_t)(val >>= 8); | |
261 | if (nrbits > 16) { | |
262 | *++p = (uint8_t)(val >>= 8); | |
263 | if (nrbits > 24) | |
264 | *++p = (uint8_t)(val >>= 8); | |
265 | } | |
266 | } | |
267 | } | |
268 | b = nrbits & 7; | |
269 | if (b == 0) | |
270 | p++; | |
271 | *addr = p; | |
272 | *pos = b; | |
273 | } | |
274 | ||
275 | /** | |
276 | * ubifs_unpack_bits - unpack bit fields. | |
277 | * @addr: address at which to unpack (passed and next address returned) | |
278 | * @pos: bit position at which to unpack (passed and next position returned) | |
279 | * @nrbits: number of bits of value to unpack (1-32) | |
280 | * | |
281 | * This functions returns the value unpacked. | |
282 | */ | |
283 | uint32_t ubifs_unpack_bits(uint8_t **addr, int *pos, int nrbits) | |
284 | { | |
285 | const int k = 32 - nrbits; | |
286 | uint8_t *p = *addr; | |
287 | int b = *pos; | |
727d2dc0 AH |
288 | uint32_t uninitialized_var(val); |
289 | const int bytes = (nrbits + b + 7) >> 3; | |
1e51764a AB |
290 | |
291 | ubifs_assert(nrbits > 0); | |
292 | ubifs_assert(nrbits <= 32); | |
293 | ubifs_assert(*pos >= 0); | |
294 | ubifs_assert(*pos < 8); | |
295 | if (b) { | |
727d2dc0 AH |
296 | switch (bytes) { |
297 | case 2: | |
298 | val = p[1]; | |
299 | break; | |
300 | case 3: | |
301 | val = p[1] | ((uint32_t)p[2] << 8); | |
302 | break; | |
303 | case 4: | |
304 | val = p[1] | ((uint32_t)p[2] << 8) | | |
305 | ((uint32_t)p[3] << 16); | |
306 | break; | |
307 | case 5: | |
308 | val = p[1] | ((uint32_t)p[2] << 8) | | |
309 | ((uint32_t)p[3] << 16) | | |
310 | ((uint32_t)p[4] << 24); | |
311 | } | |
1e51764a AB |
312 | val <<= (8 - b); |
313 | val |= *p >> b; | |
314 | nrbits += b; | |
727d2dc0 AH |
315 | } else { |
316 | switch (bytes) { | |
317 | case 1: | |
318 | val = p[0]; | |
319 | break; | |
320 | case 2: | |
321 | val = p[0] | ((uint32_t)p[1] << 8); | |
322 | break; | |
323 | case 3: | |
324 | val = p[0] | ((uint32_t)p[1] << 8) | | |
325 | ((uint32_t)p[2] << 16); | |
326 | break; | |
327 | case 4: | |
328 | val = p[0] | ((uint32_t)p[1] << 8) | | |
329 | ((uint32_t)p[2] << 16) | | |
330 | ((uint32_t)p[3] << 24); | |
331 | break; | |
332 | } | |
333 | } | |
1e51764a AB |
334 | val <<= k; |
335 | val >>= k; | |
336 | b = nrbits & 7; | |
727d2dc0 | 337 | p += nrbits >> 3; |
1e51764a AB |
338 | *addr = p; |
339 | *pos = b; | |
340 | ubifs_assert((val >> nrbits) == 0 || nrbits - b == 32); | |
341 | return val; | |
342 | } | |
343 | ||
344 | /** | |
345 | * ubifs_pack_pnode - pack all the bit fields of a pnode. | |
346 | * @c: UBIFS file-system description object | |
347 | * @buf: buffer into which to pack | |
348 | * @pnode: pnode to pack | |
349 | */ | |
350 | void ubifs_pack_pnode(struct ubifs_info *c, void *buf, | |
351 | struct ubifs_pnode *pnode) | |
352 | { | |
353 | uint8_t *addr = buf + UBIFS_LPT_CRC_BYTES; | |
354 | int i, pos = 0; | |
355 | uint16_t crc; | |
356 | ||
357 | pack_bits(&addr, &pos, UBIFS_LPT_PNODE, UBIFS_LPT_TYPE_BITS); | |
358 | if (c->big_lpt) | |
359 | pack_bits(&addr, &pos, pnode->num, c->pcnt_bits); | |
360 | for (i = 0; i < UBIFS_LPT_FANOUT; i++) { | |
361 | pack_bits(&addr, &pos, pnode->lprops[i].free >> 3, | |
362 | c->space_bits); | |
363 | pack_bits(&addr, &pos, pnode->lprops[i].dirty >> 3, | |
364 | c->space_bits); | |
365 | if (pnode->lprops[i].flags & LPROPS_INDEX) | |
366 | pack_bits(&addr, &pos, 1, 1); | |
367 | else | |
368 | pack_bits(&addr, &pos, 0, 1); | |
369 | } | |
370 | crc = crc16(-1, buf + UBIFS_LPT_CRC_BYTES, | |
371 | c->pnode_sz - UBIFS_LPT_CRC_BYTES); | |
372 | addr = buf; | |
373 | pos = 0; | |
374 | pack_bits(&addr, &pos, crc, UBIFS_LPT_CRC_BITS); | |
375 | } | |
376 | ||
377 | /** | |
378 | * ubifs_pack_nnode - pack all the bit fields of a nnode. | |
379 | * @c: UBIFS file-system description object | |
380 | * @buf: buffer into which to pack | |
381 | * @nnode: nnode to pack | |
382 | */ | |
383 | void ubifs_pack_nnode(struct ubifs_info *c, void *buf, | |
384 | struct ubifs_nnode *nnode) | |
385 | { | |
386 | uint8_t *addr = buf + UBIFS_LPT_CRC_BYTES; | |
387 | int i, pos = 0; | |
388 | uint16_t crc; | |
389 | ||
390 | pack_bits(&addr, &pos, UBIFS_LPT_NNODE, UBIFS_LPT_TYPE_BITS); | |
391 | if (c->big_lpt) | |
392 | pack_bits(&addr, &pos, nnode->num, c->pcnt_bits); | |
393 | for (i = 0; i < UBIFS_LPT_FANOUT; i++) { | |
394 | int lnum = nnode->nbranch[i].lnum; | |
395 | ||
396 | if (lnum == 0) | |
397 | lnum = c->lpt_last + 1; | |
398 | pack_bits(&addr, &pos, lnum - c->lpt_first, c->lpt_lnum_bits); | |
399 | pack_bits(&addr, &pos, nnode->nbranch[i].offs, | |
400 | c->lpt_offs_bits); | |
401 | } | |
402 | crc = crc16(-1, buf + UBIFS_LPT_CRC_BYTES, | |
403 | c->nnode_sz - UBIFS_LPT_CRC_BYTES); | |
404 | addr = buf; | |
405 | pos = 0; | |
406 | pack_bits(&addr, &pos, crc, UBIFS_LPT_CRC_BITS); | |
407 | } | |
408 | ||
409 | /** | |
410 | * ubifs_pack_ltab - pack the LPT's own lprops table. | |
411 | * @c: UBIFS file-system description object | |
412 | * @buf: buffer into which to pack | |
413 | * @ltab: LPT's own lprops table to pack | |
414 | */ | |
415 | void ubifs_pack_ltab(struct ubifs_info *c, void *buf, | |
416 | struct ubifs_lpt_lprops *ltab) | |
417 | { | |
418 | uint8_t *addr = buf + UBIFS_LPT_CRC_BYTES; | |
419 | int i, pos = 0; | |
420 | uint16_t crc; | |
421 | ||
422 | pack_bits(&addr, &pos, UBIFS_LPT_LTAB, UBIFS_LPT_TYPE_BITS); | |
423 | for (i = 0; i < c->lpt_lebs; i++) { | |
424 | pack_bits(&addr, &pos, ltab[i].free, c->lpt_spc_bits); | |
425 | pack_bits(&addr, &pos, ltab[i].dirty, c->lpt_spc_bits); | |
426 | } | |
427 | crc = crc16(-1, buf + UBIFS_LPT_CRC_BYTES, | |
428 | c->ltab_sz - UBIFS_LPT_CRC_BYTES); | |
429 | addr = buf; | |
430 | pos = 0; | |
431 | pack_bits(&addr, &pos, crc, UBIFS_LPT_CRC_BITS); | |
432 | } | |
433 | ||
434 | /** | |
435 | * ubifs_pack_lsave - pack the LPT's save table. | |
436 | * @c: UBIFS file-system description object | |
437 | * @buf: buffer into which to pack | |
438 | * @lsave: LPT's save table to pack | |
439 | */ | |
440 | void ubifs_pack_lsave(struct ubifs_info *c, void *buf, int *lsave) | |
441 | { | |
442 | uint8_t *addr = buf + UBIFS_LPT_CRC_BYTES; | |
443 | int i, pos = 0; | |
444 | uint16_t crc; | |
445 | ||
446 | pack_bits(&addr, &pos, UBIFS_LPT_LSAVE, UBIFS_LPT_TYPE_BITS); | |
447 | for (i = 0; i < c->lsave_cnt; i++) | |
448 | pack_bits(&addr, &pos, lsave[i], c->lnum_bits); | |
449 | crc = crc16(-1, buf + UBIFS_LPT_CRC_BYTES, | |
450 | c->lsave_sz - UBIFS_LPT_CRC_BYTES); | |
451 | addr = buf; | |
452 | pos = 0; | |
453 | pack_bits(&addr, &pos, crc, UBIFS_LPT_CRC_BITS); | |
454 | } | |
455 | ||
456 | /** | |
457 | * ubifs_add_lpt_dirt - add dirty space to LPT LEB properties. | |
458 | * @c: UBIFS file-system description object | |
459 | * @lnum: LEB number to which to add dirty space | |
460 | * @dirty: amount of dirty space to add | |
461 | */ | |
462 | void ubifs_add_lpt_dirt(struct ubifs_info *c, int lnum, int dirty) | |
463 | { | |
464 | if (!dirty || !lnum) | |
465 | return; | |
466 | dbg_lp("LEB %d add %d to %d", | |
467 | lnum, dirty, c->ltab[lnum - c->lpt_first].dirty); | |
468 | ubifs_assert(lnum >= c->lpt_first && lnum <= c->lpt_last); | |
469 | c->ltab[lnum - c->lpt_first].dirty += dirty; | |
470 | } | |
471 | ||
472 | /** | |
473 | * set_ltab - set LPT LEB properties. | |
474 | * @c: UBIFS file-system description object | |
475 | * @lnum: LEB number | |
476 | * @free: amount of free space | |
477 | * @dirty: amount of dirty space | |
478 | */ | |
479 | static void set_ltab(struct ubifs_info *c, int lnum, int free, int dirty) | |
480 | { | |
481 | dbg_lp("LEB %d free %d dirty %d to %d %d", | |
482 | lnum, c->ltab[lnum - c->lpt_first].free, | |
483 | c->ltab[lnum - c->lpt_first].dirty, free, dirty); | |
484 | ubifs_assert(lnum >= c->lpt_first && lnum <= c->lpt_last); | |
485 | c->ltab[lnum - c->lpt_first].free = free; | |
486 | c->ltab[lnum - c->lpt_first].dirty = dirty; | |
487 | } | |
488 | ||
489 | /** | |
490 | * ubifs_add_nnode_dirt - add dirty space to LPT LEB properties. | |
491 | * @c: UBIFS file-system description object | |
492 | * @nnode: nnode for which to add dirt | |
493 | */ | |
494 | void ubifs_add_nnode_dirt(struct ubifs_info *c, struct ubifs_nnode *nnode) | |
495 | { | |
496 | struct ubifs_nnode *np = nnode->parent; | |
497 | ||
498 | if (np) | |
499 | ubifs_add_lpt_dirt(c, np->nbranch[nnode->iip].lnum, | |
500 | c->nnode_sz); | |
501 | else { | |
502 | ubifs_add_lpt_dirt(c, c->lpt_lnum, c->nnode_sz); | |
503 | if (!(c->lpt_drty_flgs & LTAB_DIRTY)) { | |
504 | c->lpt_drty_flgs |= LTAB_DIRTY; | |
505 | ubifs_add_lpt_dirt(c, c->ltab_lnum, c->ltab_sz); | |
506 | } | |
507 | } | |
508 | } | |
509 | ||
510 | /** | |
511 | * add_pnode_dirt - add dirty space to LPT LEB properties. | |
512 | * @c: UBIFS file-system description object | |
513 | * @pnode: pnode for which to add dirt | |
514 | */ | |
515 | static void add_pnode_dirt(struct ubifs_info *c, struct ubifs_pnode *pnode) | |
516 | { | |
517 | ubifs_add_lpt_dirt(c, pnode->parent->nbranch[pnode->iip].lnum, | |
518 | c->pnode_sz); | |
519 | } | |
520 | ||
521 | /** | |
522 | * calc_nnode_num - calculate nnode number. | |
523 | * @row: the row in the tree (root is zero) | |
524 | * @col: the column in the row (leftmost is zero) | |
525 | * | |
526 | * The nnode number is a number that uniquely identifies a nnode and can be used | |
527 | * easily to traverse the tree from the root to that nnode. | |
528 | * | |
529 | * This function calculates and returns the nnode number for the nnode at @row | |
530 | * and @col. | |
531 | */ | |
532 | static int calc_nnode_num(int row, int col) | |
533 | { | |
534 | int num, bits; | |
535 | ||
536 | num = 1; | |
537 | while (row--) { | |
538 | bits = (col & (UBIFS_LPT_FANOUT - 1)); | |
539 | col >>= UBIFS_LPT_FANOUT_SHIFT; | |
540 | num <<= UBIFS_LPT_FANOUT_SHIFT; | |
541 | num |= bits; | |
542 | } | |
543 | return num; | |
544 | } | |
545 | ||
546 | /** | |
547 | * calc_nnode_num_from_parent - calculate nnode number. | |
548 | * @c: UBIFS file-system description object | |
549 | * @parent: parent nnode | |
550 | * @iip: index in parent | |
551 | * | |
552 | * The nnode number is a number that uniquely identifies a nnode and can be used | |
553 | * easily to traverse the tree from the root to that nnode. | |
554 | * | |
555 | * This function calculates and returns the nnode number based on the parent's | |
556 | * nnode number and the index in parent. | |
557 | */ | |
2ba5f7ae | 558 | static int calc_nnode_num_from_parent(const struct ubifs_info *c, |
1e51764a AB |
559 | struct ubifs_nnode *parent, int iip) |
560 | { | |
561 | int num, shft; | |
562 | ||
563 | if (!parent) | |
564 | return 1; | |
565 | shft = (c->lpt_hght - parent->level) * UBIFS_LPT_FANOUT_SHIFT; | |
566 | num = parent->num ^ (1 << shft); | |
567 | num |= (UBIFS_LPT_FANOUT + iip) << shft; | |
568 | return num; | |
569 | } | |
570 | ||
571 | /** | |
572 | * calc_pnode_num_from_parent - calculate pnode number. | |
573 | * @c: UBIFS file-system description object | |
574 | * @parent: parent nnode | |
575 | * @iip: index in parent | |
576 | * | |
577 | * The pnode number is a number that uniquely identifies a pnode and can be used | |
578 | * easily to traverse the tree from the root to that pnode. | |
579 | * | |
580 | * This function calculates and returns the pnode number based on the parent's | |
581 | * nnode number and the index in parent. | |
582 | */ | |
2ba5f7ae | 583 | static int calc_pnode_num_from_parent(const struct ubifs_info *c, |
1e51764a AB |
584 | struct ubifs_nnode *parent, int iip) |
585 | { | |
586 | int i, n = c->lpt_hght - 1, pnum = parent->num, num = 0; | |
587 | ||
588 | for (i = 0; i < n; i++) { | |
589 | num <<= UBIFS_LPT_FANOUT_SHIFT; | |
590 | num |= pnum & (UBIFS_LPT_FANOUT - 1); | |
591 | pnum >>= UBIFS_LPT_FANOUT_SHIFT; | |
592 | } | |
593 | num <<= UBIFS_LPT_FANOUT_SHIFT; | |
594 | num |= iip; | |
595 | return num; | |
596 | } | |
597 | ||
598 | /** | |
599 | * ubifs_create_dflt_lpt - create default LPT. | |
600 | * @c: UBIFS file-system description object | |
601 | * @main_lebs: number of main area LEBs is passed and returned here | |
602 | * @lpt_first: LEB number of first LPT LEB | |
603 | * @lpt_lebs: number of LEBs for LPT is passed and returned here | |
604 | * @big_lpt: use big LPT model is passed and returned here | |
605 | * | |
606 | * This function returns %0 on success and a negative error code on failure. | |
607 | */ | |
608 | int ubifs_create_dflt_lpt(struct ubifs_info *c, int *main_lebs, int lpt_first, | |
609 | int *lpt_lebs, int *big_lpt) | |
610 | { | |
611 | int lnum, err = 0, node_sz, iopos, i, j, cnt, len, alen, row; | |
612 | int blnum, boffs, bsz, bcnt; | |
613 | struct ubifs_pnode *pnode = NULL; | |
614 | struct ubifs_nnode *nnode = NULL; | |
615 | void *buf = NULL, *p; | |
616 | struct ubifs_lpt_lprops *ltab = NULL; | |
617 | int *lsave = NULL; | |
618 | ||
619 | err = calc_dflt_lpt_geom(c, main_lebs, big_lpt); | |
620 | if (err) | |
621 | return err; | |
622 | *lpt_lebs = c->lpt_lebs; | |
623 | ||
624 | /* Needed by 'ubifs_pack_nnode()' and 'set_ltab()' */ | |
625 | c->lpt_first = lpt_first; | |
626 | /* Needed by 'set_ltab()' */ | |
627 | c->lpt_last = lpt_first + c->lpt_lebs - 1; | |
628 | /* Needed by 'ubifs_pack_lsave()' */ | |
629 | c->main_first = c->leb_cnt - *main_lebs; | |
630 | ||
631 | lsave = kmalloc(sizeof(int) * c->lsave_cnt, GFP_KERNEL); | |
632 | pnode = kzalloc(sizeof(struct ubifs_pnode), GFP_KERNEL); | |
633 | nnode = kzalloc(sizeof(struct ubifs_nnode), GFP_KERNEL); | |
634 | buf = vmalloc(c->leb_size); | |
635 | ltab = vmalloc(sizeof(struct ubifs_lpt_lprops) * c->lpt_lebs); | |
636 | if (!pnode || !nnode || !buf || !ltab || !lsave) { | |
637 | err = -ENOMEM; | |
638 | goto out; | |
639 | } | |
640 | ||
641 | ubifs_assert(!c->ltab); | |
642 | c->ltab = ltab; /* Needed by set_ltab */ | |
643 | ||
644 | /* Initialize LPT's own lprops */ | |
645 | for (i = 0; i < c->lpt_lebs; i++) { | |
646 | ltab[i].free = c->leb_size; | |
647 | ltab[i].dirty = 0; | |
648 | ltab[i].tgc = 0; | |
649 | ltab[i].cmt = 0; | |
650 | } | |
651 | ||
652 | lnum = lpt_first; | |
653 | p = buf; | |
654 | /* Number of leaf nodes (pnodes) */ | |
655 | cnt = c->pnode_cnt; | |
656 | ||
657 | /* | |
658 | * The first pnode contains the LEB properties for the LEBs that contain | |
659 | * the root inode node and the root index node of the index tree. | |
660 | */ | |
661 | node_sz = ALIGN(ubifs_idx_node_sz(c, 1), 8); | |
662 | iopos = ALIGN(node_sz, c->min_io_size); | |
663 | pnode->lprops[0].free = c->leb_size - iopos; | |
664 | pnode->lprops[0].dirty = iopos - node_sz; | |
665 | pnode->lprops[0].flags = LPROPS_INDEX; | |
666 | ||
667 | node_sz = UBIFS_INO_NODE_SZ; | |
668 | iopos = ALIGN(node_sz, c->min_io_size); | |
669 | pnode->lprops[1].free = c->leb_size - iopos; | |
670 | pnode->lprops[1].dirty = iopos - node_sz; | |
671 | ||
672 | for (i = 2; i < UBIFS_LPT_FANOUT; i++) | |
673 | pnode->lprops[i].free = c->leb_size; | |
674 | ||
675 | /* Add first pnode */ | |
676 | ubifs_pack_pnode(c, p, pnode); | |
677 | p += c->pnode_sz; | |
678 | len = c->pnode_sz; | |
679 | pnode->num += 1; | |
680 | ||
681 | /* Reset pnode values for remaining pnodes */ | |
682 | pnode->lprops[0].free = c->leb_size; | |
683 | pnode->lprops[0].dirty = 0; | |
684 | pnode->lprops[0].flags = 0; | |
685 | ||
686 | pnode->lprops[1].free = c->leb_size; | |
687 | pnode->lprops[1].dirty = 0; | |
688 | ||
689 | /* | |
690 | * To calculate the internal node branches, we keep information about | |
691 | * the level below. | |
692 | */ | |
693 | blnum = lnum; /* LEB number of level below */ | |
694 | boffs = 0; /* Offset of level below */ | |
695 | bcnt = cnt; /* Number of nodes in level below */ | |
696 | bsz = c->pnode_sz; /* Size of nodes in level below */ | |
697 | ||
698 | /* Add all remaining pnodes */ | |
699 | for (i = 1; i < cnt; i++) { | |
700 | if (len + c->pnode_sz > c->leb_size) { | |
701 | alen = ALIGN(len, c->min_io_size); | |
702 | set_ltab(c, lnum, c->leb_size - alen, alen - len); | |
703 | memset(p, 0xff, alen - len); | |
d3b2578f AB |
704 | err = ubifs_leb_change(c, lnum++, buf, alen, |
705 | UBI_SHORTTERM); | |
1e51764a AB |
706 | if (err) |
707 | goto out; | |
708 | p = buf; | |
709 | len = 0; | |
710 | } | |
711 | ubifs_pack_pnode(c, p, pnode); | |
712 | p += c->pnode_sz; | |
713 | len += c->pnode_sz; | |
714 | /* | |
715 | * pnodes are simply numbered left to right starting at zero, | |
716 | * which means the pnode number can be used easily to traverse | |
717 | * down the tree to the corresponding pnode. | |
718 | */ | |
719 | pnode->num += 1; | |
720 | } | |
721 | ||
722 | row = 0; | |
723 | for (i = UBIFS_LPT_FANOUT; cnt > i; i <<= UBIFS_LPT_FANOUT_SHIFT) | |
724 | row += 1; | |
725 | /* Add all nnodes, one level at a time */ | |
726 | while (1) { | |
727 | /* Number of internal nodes (nnodes) at next level */ | |
728 | cnt = DIV_ROUND_UP(cnt, UBIFS_LPT_FANOUT); | |
729 | for (i = 0; i < cnt; i++) { | |
730 | if (len + c->nnode_sz > c->leb_size) { | |
731 | alen = ALIGN(len, c->min_io_size); | |
732 | set_ltab(c, lnum, c->leb_size - alen, | |
733 | alen - len); | |
734 | memset(p, 0xff, alen - len); | |
d3b2578f AB |
735 | err = ubifs_leb_change(c, lnum++, buf, alen, |
736 | UBI_SHORTTERM); | |
1e51764a AB |
737 | if (err) |
738 | goto out; | |
739 | p = buf; | |
740 | len = 0; | |
741 | } | |
742 | /* Only 1 nnode at this level, so it is the root */ | |
743 | if (cnt == 1) { | |
744 | c->lpt_lnum = lnum; | |
745 | c->lpt_offs = len; | |
746 | } | |
747 | /* Set branches to the level below */ | |
748 | for (j = 0; j < UBIFS_LPT_FANOUT; j++) { | |
749 | if (bcnt) { | |
750 | if (boffs + bsz > c->leb_size) { | |
751 | blnum += 1; | |
752 | boffs = 0; | |
753 | } | |
754 | nnode->nbranch[j].lnum = blnum; | |
755 | nnode->nbranch[j].offs = boffs; | |
756 | boffs += bsz; | |
757 | bcnt--; | |
758 | } else { | |
759 | nnode->nbranch[j].lnum = 0; | |
760 | nnode->nbranch[j].offs = 0; | |
761 | } | |
762 | } | |
763 | nnode->num = calc_nnode_num(row, i); | |
764 | ubifs_pack_nnode(c, p, nnode); | |
765 | p += c->nnode_sz; | |
766 | len += c->nnode_sz; | |
767 | } | |
768 | /* Only 1 nnode at this level, so it is the root */ | |
769 | if (cnt == 1) | |
770 | break; | |
771 | /* Update the information about the level below */ | |
772 | bcnt = cnt; | |
773 | bsz = c->nnode_sz; | |
774 | row -= 1; | |
775 | } | |
776 | ||
777 | if (*big_lpt) { | |
778 | /* Need to add LPT's save table */ | |
779 | if (len + c->lsave_sz > c->leb_size) { | |
780 | alen = ALIGN(len, c->min_io_size); | |
781 | set_ltab(c, lnum, c->leb_size - alen, alen - len); | |
782 | memset(p, 0xff, alen - len); | |
d3b2578f AB |
783 | err = ubifs_leb_change(c, lnum++, buf, alen, |
784 | UBI_SHORTTERM); | |
1e51764a AB |
785 | if (err) |
786 | goto out; | |
787 | p = buf; | |
788 | len = 0; | |
789 | } | |
790 | ||
791 | c->lsave_lnum = lnum; | |
792 | c->lsave_offs = len; | |
793 | ||
794 | for (i = 0; i < c->lsave_cnt && i < *main_lebs; i++) | |
795 | lsave[i] = c->main_first + i; | |
796 | for (; i < c->lsave_cnt; i++) | |
797 | lsave[i] = c->main_first; | |
798 | ||
799 | ubifs_pack_lsave(c, p, lsave); | |
800 | p += c->lsave_sz; | |
801 | len += c->lsave_sz; | |
802 | } | |
803 | ||
804 | /* Need to add LPT's own LEB properties table */ | |
805 | if (len + c->ltab_sz > c->leb_size) { | |
806 | alen = ALIGN(len, c->min_io_size); | |
807 | set_ltab(c, lnum, c->leb_size - alen, alen - len); | |
808 | memset(p, 0xff, alen - len); | |
d3b2578f | 809 | err = ubifs_leb_change(c, lnum++, buf, alen, UBI_SHORTTERM); |
1e51764a AB |
810 | if (err) |
811 | goto out; | |
812 | p = buf; | |
813 | len = 0; | |
814 | } | |
815 | ||
816 | c->ltab_lnum = lnum; | |
817 | c->ltab_offs = len; | |
818 | ||
819 | /* Update ltab before packing it */ | |
820 | len += c->ltab_sz; | |
821 | alen = ALIGN(len, c->min_io_size); | |
822 | set_ltab(c, lnum, c->leb_size - alen, alen - len); | |
823 | ||
824 | ubifs_pack_ltab(c, p, ltab); | |
825 | p += c->ltab_sz; | |
826 | ||
827 | /* Write remaining buffer */ | |
828 | memset(p, 0xff, alen - len); | |
d3b2578f | 829 | err = ubifs_leb_change(c, lnum, buf, alen, UBI_SHORTTERM); |
1e51764a AB |
830 | if (err) |
831 | goto out; | |
832 | ||
833 | c->nhead_lnum = lnum; | |
834 | c->nhead_offs = ALIGN(len, c->min_io_size); | |
835 | ||
836 | dbg_lp("space_bits %d", c->space_bits); | |
837 | dbg_lp("lpt_lnum_bits %d", c->lpt_lnum_bits); | |
838 | dbg_lp("lpt_offs_bits %d", c->lpt_offs_bits); | |
839 | dbg_lp("lpt_spc_bits %d", c->lpt_spc_bits); | |
840 | dbg_lp("pcnt_bits %d", c->pcnt_bits); | |
841 | dbg_lp("lnum_bits %d", c->lnum_bits); | |
842 | dbg_lp("pnode_sz %d", c->pnode_sz); | |
843 | dbg_lp("nnode_sz %d", c->nnode_sz); | |
844 | dbg_lp("ltab_sz %d", c->ltab_sz); | |
845 | dbg_lp("lsave_sz %d", c->lsave_sz); | |
846 | dbg_lp("lsave_cnt %d", c->lsave_cnt); | |
847 | dbg_lp("lpt_hght %d", c->lpt_hght); | |
848 | dbg_lp("big_lpt %d", c->big_lpt); | |
849 | dbg_lp("LPT root is at %d:%d", c->lpt_lnum, c->lpt_offs); | |
850 | dbg_lp("LPT head is at %d:%d", c->nhead_lnum, c->nhead_offs); | |
851 | dbg_lp("LPT ltab is at %d:%d", c->ltab_lnum, c->ltab_offs); | |
852 | if (c->big_lpt) | |
853 | dbg_lp("LPT lsave is at %d:%d", c->lsave_lnum, c->lsave_offs); | |
854 | out: | |
855 | c->ltab = NULL; | |
856 | kfree(lsave); | |
857 | vfree(ltab); | |
858 | vfree(buf); | |
859 | kfree(nnode); | |
860 | kfree(pnode); | |
861 | return err; | |
862 | } | |
863 | ||
864 | /** | |
865 | * update_cats - add LEB properties of a pnode to LEB category lists and heaps. | |
866 | * @c: UBIFS file-system description object | |
867 | * @pnode: pnode | |
868 | * | |
869 | * When a pnode is loaded into memory, the LEB properties it contains are added, | |
870 | * by this function, to the LEB category lists and heaps. | |
871 | */ | |
872 | static void update_cats(struct ubifs_info *c, struct ubifs_pnode *pnode) | |
873 | { | |
874 | int i; | |
875 | ||
876 | for (i = 0; i < UBIFS_LPT_FANOUT; i++) { | |
877 | int cat = pnode->lprops[i].flags & LPROPS_CAT_MASK; | |
878 | int lnum = pnode->lprops[i].lnum; | |
879 | ||
880 | if (!lnum) | |
881 | return; | |
882 | ubifs_add_to_cat(c, &pnode->lprops[i], cat); | |
883 | } | |
884 | } | |
885 | ||
886 | /** | |
887 | * replace_cats - add LEB properties of a pnode to LEB category lists and heaps. | |
888 | * @c: UBIFS file-system description object | |
889 | * @old_pnode: pnode copied | |
890 | * @new_pnode: pnode copy | |
891 | * | |
892 | * During commit it is sometimes necessary to copy a pnode | |
893 | * (see dirty_cow_pnode). When that happens, references in | |
894 | * category lists and heaps must be replaced. This function does that. | |
895 | */ | |
896 | static void replace_cats(struct ubifs_info *c, struct ubifs_pnode *old_pnode, | |
897 | struct ubifs_pnode *new_pnode) | |
898 | { | |
899 | int i; | |
900 | ||
901 | for (i = 0; i < UBIFS_LPT_FANOUT; i++) { | |
902 | if (!new_pnode->lprops[i].lnum) | |
903 | return; | |
904 | ubifs_replace_cat(c, &old_pnode->lprops[i], | |
905 | &new_pnode->lprops[i]); | |
906 | } | |
907 | } | |
908 | ||
909 | /** | |
910 | * check_lpt_crc - check LPT node crc is correct. | |
911 | * @c: UBIFS file-system description object | |
912 | * @buf: buffer containing node | |
913 | * @len: length of node | |
914 | * | |
915 | * This function returns %0 on success and a negative error code on failure. | |
916 | */ | |
917 | static int check_lpt_crc(void *buf, int len) | |
918 | { | |
919 | int pos = 0; | |
920 | uint8_t *addr = buf; | |
921 | uint16_t crc, calc_crc; | |
922 | ||
923 | crc = ubifs_unpack_bits(&addr, &pos, UBIFS_LPT_CRC_BITS); | |
924 | calc_crc = crc16(-1, buf + UBIFS_LPT_CRC_BYTES, | |
925 | len - UBIFS_LPT_CRC_BYTES); | |
926 | if (crc != calc_crc) { | |
927 | ubifs_err("invalid crc in LPT node: crc %hx calc %hx", crc, | |
928 | calc_crc); | |
929 | dbg_dump_stack(); | |
930 | return -EINVAL; | |
931 | } | |
932 | return 0; | |
933 | } | |
934 | ||
935 | /** | |
936 | * check_lpt_type - check LPT node type is correct. | |
937 | * @c: UBIFS file-system description object | |
938 | * @addr: address of type bit field is passed and returned updated here | |
939 | * @pos: position of type bit field is passed and returned updated here | |
940 | * @type: expected type | |
941 | * | |
942 | * This function returns %0 on success and a negative error code on failure. | |
943 | */ | |
944 | static int check_lpt_type(uint8_t **addr, int *pos, int type) | |
945 | { | |
946 | int node_type; | |
947 | ||
948 | node_type = ubifs_unpack_bits(addr, pos, UBIFS_LPT_TYPE_BITS); | |
949 | if (node_type != type) { | |
950 | ubifs_err("invalid type (%d) in LPT node type %d", node_type, | |
951 | type); | |
952 | dbg_dump_stack(); | |
953 | return -EINVAL; | |
954 | } | |
955 | return 0; | |
956 | } | |
957 | ||
958 | /** | |
959 | * unpack_pnode - unpack a pnode. | |
960 | * @c: UBIFS file-system description object | |
961 | * @buf: buffer containing packed pnode to unpack | |
962 | * @pnode: pnode structure to fill | |
963 | * | |
964 | * This function returns %0 on success and a negative error code on failure. | |
965 | */ | |
2ba5f7ae | 966 | static int unpack_pnode(const struct ubifs_info *c, void *buf, |
1e51764a AB |
967 | struct ubifs_pnode *pnode) |
968 | { | |
969 | uint8_t *addr = buf + UBIFS_LPT_CRC_BYTES; | |
970 | int i, pos = 0, err; | |
971 | ||
972 | err = check_lpt_type(&addr, &pos, UBIFS_LPT_PNODE); | |
973 | if (err) | |
974 | return err; | |
975 | if (c->big_lpt) | |
976 | pnode->num = ubifs_unpack_bits(&addr, &pos, c->pcnt_bits); | |
977 | for (i = 0; i < UBIFS_LPT_FANOUT; i++) { | |
978 | struct ubifs_lprops * const lprops = &pnode->lprops[i]; | |
979 | ||
980 | lprops->free = ubifs_unpack_bits(&addr, &pos, c->space_bits); | |
981 | lprops->free <<= 3; | |
982 | lprops->dirty = ubifs_unpack_bits(&addr, &pos, c->space_bits); | |
983 | lprops->dirty <<= 3; | |
984 | ||
985 | if (ubifs_unpack_bits(&addr, &pos, 1)) | |
986 | lprops->flags = LPROPS_INDEX; | |
987 | else | |
988 | lprops->flags = 0; | |
989 | lprops->flags |= ubifs_categorize_lprops(c, lprops); | |
990 | } | |
991 | err = check_lpt_crc(buf, c->pnode_sz); | |
992 | return err; | |
993 | } | |
994 | ||
995 | /** | |
2ba5f7ae | 996 | * ubifs_unpack_nnode - unpack a nnode. |
1e51764a AB |
997 | * @c: UBIFS file-system description object |
998 | * @buf: buffer containing packed nnode to unpack | |
999 | * @nnode: nnode structure to fill | |
1000 | * | |
1001 | * This function returns %0 on success and a negative error code on failure. | |
1002 | */ | |
2ba5f7ae AB |
1003 | int ubifs_unpack_nnode(const struct ubifs_info *c, void *buf, |
1004 | struct ubifs_nnode *nnode) | |
1e51764a AB |
1005 | { |
1006 | uint8_t *addr = buf + UBIFS_LPT_CRC_BYTES; | |
1007 | int i, pos = 0, err; | |
1008 | ||
1009 | err = check_lpt_type(&addr, &pos, UBIFS_LPT_NNODE); | |
1010 | if (err) | |
1011 | return err; | |
1012 | if (c->big_lpt) | |
1013 | nnode->num = ubifs_unpack_bits(&addr, &pos, c->pcnt_bits); | |
1014 | for (i = 0; i < UBIFS_LPT_FANOUT; i++) { | |
1015 | int lnum; | |
1016 | ||
1017 | lnum = ubifs_unpack_bits(&addr, &pos, c->lpt_lnum_bits) + | |
1018 | c->lpt_first; | |
1019 | if (lnum == c->lpt_last + 1) | |
1020 | lnum = 0; | |
1021 | nnode->nbranch[i].lnum = lnum; | |
1022 | nnode->nbranch[i].offs = ubifs_unpack_bits(&addr, &pos, | |
1023 | c->lpt_offs_bits); | |
1024 | } | |
1025 | err = check_lpt_crc(buf, c->nnode_sz); | |
1026 | return err; | |
1027 | } | |
1028 | ||
1029 | /** | |
1030 | * unpack_ltab - unpack the LPT's own lprops table. | |
1031 | * @c: UBIFS file-system description object | |
1032 | * @buf: buffer from which to unpack | |
1033 | * | |
1034 | * This function returns %0 on success and a negative error code on failure. | |
1035 | */ | |
2ba5f7ae | 1036 | static int unpack_ltab(const struct ubifs_info *c, void *buf) |
1e51764a AB |
1037 | { |
1038 | uint8_t *addr = buf + UBIFS_LPT_CRC_BYTES; | |
1039 | int i, pos = 0, err; | |
1040 | ||
1041 | err = check_lpt_type(&addr, &pos, UBIFS_LPT_LTAB); | |
1042 | if (err) | |
1043 | return err; | |
1044 | for (i = 0; i < c->lpt_lebs; i++) { | |
1045 | int free = ubifs_unpack_bits(&addr, &pos, c->lpt_spc_bits); | |
1046 | int dirty = ubifs_unpack_bits(&addr, &pos, c->lpt_spc_bits); | |
1047 | ||
1048 | if (free < 0 || free > c->leb_size || dirty < 0 || | |
1049 | dirty > c->leb_size || free + dirty > c->leb_size) | |
1050 | return -EINVAL; | |
1051 | ||
1052 | c->ltab[i].free = free; | |
1053 | c->ltab[i].dirty = dirty; | |
1054 | c->ltab[i].tgc = 0; | |
1055 | c->ltab[i].cmt = 0; | |
1056 | } | |
1057 | err = check_lpt_crc(buf, c->ltab_sz); | |
1058 | return err; | |
1059 | } | |
1060 | ||
1061 | /** | |
1062 | * unpack_lsave - unpack the LPT's save table. | |
1063 | * @c: UBIFS file-system description object | |
1064 | * @buf: buffer from which to unpack | |
1065 | * | |
1066 | * This function returns %0 on success and a negative error code on failure. | |
1067 | */ | |
2ba5f7ae | 1068 | static int unpack_lsave(const struct ubifs_info *c, void *buf) |
1e51764a AB |
1069 | { |
1070 | uint8_t *addr = buf + UBIFS_LPT_CRC_BYTES; | |
1071 | int i, pos = 0, err; | |
1072 | ||
1073 | err = check_lpt_type(&addr, &pos, UBIFS_LPT_LSAVE); | |
1074 | if (err) | |
1075 | return err; | |
1076 | for (i = 0; i < c->lsave_cnt; i++) { | |
1077 | int lnum = ubifs_unpack_bits(&addr, &pos, c->lnum_bits); | |
1078 | ||
1079 | if (lnum < c->main_first || lnum >= c->leb_cnt) | |
1080 | return -EINVAL; | |
1081 | c->lsave[i] = lnum; | |
1082 | } | |
1083 | err = check_lpt_crc(buf, c->lsave_sz); | |
1084 | return err; | |
1085 | } | |
1086 | ||
1087 | /** | |
1088 | * validate_nnode - validate a nnode. | |
1089 | * @c: UBIFS file-system description object | |
1090 | * @nnode: nnode to validate | |
1091 | * @parent: parent nnode (or NULL for the root nnode) | |
1092 | * @iip: index in parent | |
1093 | * | |
1094 | * This function returns %0 on success and a negative error code on failure. | |
1095 | */ | |
2ba5f7ae | 1096 | static int validate_nnode(const struct ubifs_info *c, struct ubifs_nnode *nnode, |
1e51764a AB |
1097 | struct ubifs_nnode *parent, int iip) |
1098 | { | |
1099 | int i, lvl, max_offs; | |
1100 | ||
1101 | if (c->big_lpt) { | |
1102 | int num = calc_nnode_num_from_parent(c, parent, iip); | |
1103 | ||
1104 | if (nnode->num != num) | |
1105 | return -EINVAL; | |
1106 | } | |
1107 | lvl = parent ? parent->level - 1 : c->lpt_hght; | |
1108 | if (lvl < 1) | |
1109 | return -EINVAL; | |
1110 | if (lvl == 1) | |
1111 | max_offs = c->leb_size - c->pnode_sz; | |
1112 | else | |
1113 | max_offs = c->leb_size - c->nnode_sz; | |
1114 | for (i = 0; i < UBIFS_LPT_FANOUT; i++) { | |
1115 | int lnum = nnode->nbranch[i].lnum; | |
1116 | int offs = nnode->nbranch[i].offs; | |
1117 | ||
1118 | if (lnum == 0) { | |
1119 | if (offs != 0) | |
1120 | return -EINVAL; | |
1121 | continue; | |
1122 | } | |
1123 | if (lnum < c->lpt_first || lnum > c->lpt_last) | |
1124 | return -EINVAL; | |
1125 | if (offs < 0 || offs > max_offs) | |
1126 | return -EINVAL; | |
1127 | } | |
1128 | return 0; | |
1129 | } | |
1130 | ||
1131 | /** | |
1132 | * validate_pnode - validate a pnode. | |
1133 | * @c: UBIFS file-system description object | |
1134 | * @pnode: pnode to validate | |
1135 | * @parent: parent nnode | |
1136 | * @iip: index in parent | |
1137 | * | |
1138 | * This function returns %0 on success and a negative error code on failure. | |
1139 | */ | |
2ba5f7ae | 1140 | static int validate_pnode(const struct ubifs_info *c, struct ubifs_pnode *pnode, |
1e51764a AB |
1141 | struct ubifs_nnode *parent, int iip) |
1142 | { | |
1143 | int i; | |
1144 | ||
1145 | if (c->big_lpt) { | |
1146 | int num = calc_pnode_num_from_parent(c, parent, iip); | |
1147 | ||
1148 | if (pnode->num != num) | |
1149 | return -EINVAL; | |
1150 | } | |
1151 | for (i = 0; i < UBIFS_LPT_FANOUT; i++) { | |
1152 | int free = pnode->lprops[i].free; | |
1153 | int dirty = pnode->lprops[i].dirty; | |
1154 | ||
1155 | if (free < 0 || free > c->leb_size || free % c->min_io_size || | |
1156 | (free & 7)) | |
1157 | return -EINVAL; | |
1158 | if (dirty < 0 || dirty > c->leb_size || (dirty & 7)) | |
1159 | return -EINVAL; | |
1160 | if (dirty + free > c->leb_size) | |
1161 | return -EINVAL; | |
1162 | } | |
1163 | return 0; | |
1164 | } | |
1165 | ||
1166 | /** | |
1167 | * set_pnode_lnum - set LEB numbers on a pnode. | |
1168 | * @c: UBIFS file-system description object | |
1169 | * @pnode: pnode to update | |
1170 | * | |
1171 | * This function calculates the LEB numbers for the LEB properties it contains | |
1172 | * based on the pnode number. | |
1173 | */ | |
2ba5f7ae AB |
1174 | static void set_pnode_lnum(const struct ubifs_info *c, |
1175 | struct ubifs_pnode *pnode) | |
1e51764a AB |
1176 | { |
1177 | int i, lnum; | |
1178 | ||
1179 | lnum = (pnode->num << UBIFS_LPT_FANOUT_SHIFT) + c->main_first; | |
1180 | for (i = 0; i < UBIFS_LPT_FANOUT; i++) { | |
1181 | if (lnum >= c->leb_cnt) | |
1182 | return; | |
1183 | pnode->lprops[i].lnum = lnum++; | |
1184 | } | |
1185 | } | |
1186 | ||
1187 | /** | |
1188 | * ubifs_read_nnode - read a nnode from flash and link it to the tree in memory. | |
1189 | * @c: UBIFS file-system description object | |
1190 | * @parent: parent nnode (or NULL for the root) | |
1191 | * @iip: index in parent | |
1192 | * | |
1193 | * This function returns %0 on success and a negative error code on failure. | |
1194 | */ | |
1195 | int ubifs_read_nnode(struct ubifs_info *c, struct ubifs_nnode *parent, int iip) | |
1196 | { | |
1197 | struct ubifs_nbranch *branch = NULL; | |
1198 | struct ubifs_nnode *nnode = NULL; | |
1199 | void *buf = c->lpt_nod_buf; | |
1200 | int err, lnum, offs; | |
1201 | ||
1202 | if (parent) { | |
1203 | branch = &parent->nbranch[iip]; | |
1204 | lnum = branch->lnum; | |
1205 | offs = branch->offs; | |
1206 | } else { | |
1207 | lnum = c->lpt_lnum; | |
1208 | offs = c->lpt_offs; | |
1209 | } | |
1210 | nnode = kzalloc(sizeof(struct ubifs_nnode), GFP_NOFS); | |
1211 | if (!nnode) { | |
1212 | err = -ENOMEM; | |
1213 | goto out; | |
1214 | } | |
1215 | if (lnum == 0) { | |
1216 | /* | |
1217 | * This nnode was not written which just means that the LEB | |
1218 | * properties in the subtree below it describe empty LEBs. We | |
1219 | * make the nnode as though we had read it, which in fact means | |
1220 | * doing almost nothing. | |
1221 | */ | |
1222 | if (c->big_lpt) | |
1223 | nnode->num = calc_nnode_num_from_parent(c, parent, iip); | |
1224 | } else { | |
d304820a | 1225 | err = ubifs_leb_read(c, lnum, buf, offs, c->nnode_sz, 1); |
1e51764a AB |
1226 | if (err) |
1227 | goto out; | |
2ba5f7ae | 1228 | err = ubifs_unpack_nnode(c, buf, nnode); |
1e51764a AB |
1229 | if (err) |
1230 | goto out; | |
1231 | } | |
1232 | err = validate_nnode(c, nnode, parent, iip); | |
1233 | if (err) | |
1234 | goto out; | |
1235 | if (!c->big_lpt) | |
1236 | nnode->num = calc_nnode_num_from_parent(c, parent, iip); | |
1237 | if (parent) { | |
1238 | branch->nnode = nnode; | |
1239 | nnode->level = parent->level - 1; | |
1240 | } else { | |
1241 | c->nroot = nnode; | |
1242 | nnode->level = c->lpt_hght; | |
1243 | } | |
1244 | nnode->parent = parent; | |
1245 | nnode->iip = iip; | |
1246 | return 0; | |
1247 | ||
1248 | out: | |
1249 | ubifs_err("error %d reading nnode at %d:%d", err, lnum, offs); | |
bfcf677d | 1250 | dbg_dump_stack(); |
1e51764a AB |
1251 | kfree(nnode); |
1252 | return err; | |
1253 | } | |
1254 | ||
1255 | /** | |
1256 | * read_pnode - read a pnode from flash and link it to the tree in memory. | |
1257 | * @c: UBIFS file-system description object | |
1258 | * @parent: parent nnode | |
1259 | * @iip: index in parent | |
1260 | * | |
1261 | * This function returns %0 on success and a negative error code on failure. | |
1262 | */ | |
1263 | static int read_pnode(struct ubifs_info *c, struct ubifs_nnode *parent, int iip) | |
1264 | { | |
1265 | struct ubifs_nbranch *branch; | |
1266 | struct ubifs_pnode *pnode = NULL; | |
1267 | void *buf = c->lpt_nod_buf; | |
1268 | int err, lnum, offs; | |
1269 | ||
1270 | branch = &parent->nbranch[iip]; | |
1271 | lnum = branch->lnum; | |
1272 | offs = branch->offs; | |
1273 | pnode = kzalloc(sizeof(struct ubifs_pnode), GFP_NOFS); | |
54acbaaa AB |
1274 | if (!pnode) |
1275 | return -ENOMEM; | |
1276 | ||
1e51764a AB |
1277 | if (lnum == 0) { |
1278 | /* | |
1279 | * This pnode was not written which just means that the LEB | |
1280 | * properties in it describe empty LEBs. We make the pnode as | |
1281 | * though we had read it. | |
1282 | */ | |
1283 | int i; | |
1284 | ||
1285 | if (c->big_lpt) | |
1286 | pnode->num = calc_pnode_num_from_parent(c, parent, iip); | |
1287 | for (i = 0; i < UBIFS_LPT_FANOUT; i++) { | |
1288 | struct ubifs_lprops * const lprops = &pnode->lprops[i]; | |
1289 | ||
1290 | lprops->free = c->leb_size; | |
1291 | lprops->flags = ubifs_categorize_lprops(c, lprops); | |
1292 | } | |
1293 | } else { | |
d304820a | 1294 | err = ubifs_leb_read(c, lnum, buf, offs, c->pnode_sz, 1); |
1e51764a AB |
1295 | if (err) |
1296 | goto out; | |
1297 | err = unpack_pnode(c, buf, pnode); | |
1298 | if (err) | |
1299 | goto out; | |
1300 | } | |
1301 | err = validate_pnode(c, pnode, parent, iip); | |
1302 | if (err) | |
1303 | goto out; | |
1304 | if (!c->big_lpt) | |
1305 | pnode->num = calc_pnode_num_from_parent(c, parent, iip); | |
1306 | branch->pnode = pnode; | |
1307 | pnode->parent = parent; | |
1308 | pnode->iip = iip; | |
1309 | set_pnode_lnum(c, pnode); | |
1310 | c->pnodes_have += 1; | |
1311 | return 0; | |
1312 | ||
1313 | out: | |
1314 | ubifs_err("error %d reading pnode at %d:%d", err, lnum, offs); | |
1315 | dbg_dump_pnode(c, pnode, parent, iip); | |
bfcf677d | 1316 | dbg_dump_stack(); |
1e51764a AB |
1317 | dbg_msg("calc num: %d", calc_pnode_num_from_parent(c, parent, iip)); |
1318 | kfree(pnode); | |
1319 | return err; | |
1320 | } | |
1321 | ||
1322 | /** | |
1323 | * read_ltab - read LPT's own lprops table. | |
1324 | * @c: UBIFS file-system description object | |
1325 | * | |
1326 | * This function returns %0 on success and a negative error code on failure. | |
1327 | */ | |
1328 | static int read_ltab(struct ubifs_info *c) | |
1329 | { | |
1330 | int err; | |
1331 | void *buf; | |
1332 | ||
1333 | buf = vmalloc(c->ltab_sz); | |
1334 | if (!buf) | |
1335 | return -ENOMEM; | |
d304820a | 1336 | err = ubifs_leb_read(c, c->ltab_lnum, buf, c->ltab_offs, c->ltab_sz, 1); |
1e51764a AB |
1337 | if (err) |
1338 | goto out; | |
1339 | err = unpack_ltab(c, buf); | |
1340 | out: | |
1341 | vfree(buf); | |
1342 | return err; | |
1343 | } | |
1344 | ||
1345 | /** | |
1346 | * read_lsave - read LPT's save table. | |
1347 | * @c: UBIFS file-system description object | |
1348 | * | |
1349 | * This function returns %0 on success and a negative error code on failure. | |
1350 | */ | |
1351 | static int read_lsave(struct ubifs_info *c) | |
1352 | { | |
1353 | int err, i; | |
1354 | void *buf; | |
1355 | ||
1356 | buf = vmalloc(c->lsave_sz); | |
1357 | if (!buf) | |
1358 | return -ENOMEM; | |
d304820a AB |
1359 | err = ubifs_leb_read(c, c->lsave_lnum, buf, c->lsave_offs, |
1360 | c->lsave_sz, 1); | |
1e51764a AB |
1361 | if (err) |
1362 | goto out; | |
1363 | err = unpack_lsave(c, buf); | |
1364 | if (err) | |
1365 | goto out; | |
1366 | for (i = 0; i < c->lsave_cnt; i++) { | |
1367 | int lnum = c->lsave[i]; | |
0e54c899 | 1368 | struct ubifs_lprops *lprops; |
1e51764a AB |
1369 | |
1370 | /* | |
1371 | * Due to automatic resizing, the values in the lsave table | |
1372 | * could be beyond the volume size - just ignore them. | |
1373 | */ | |
1374 | if (lnum >= c->leb_cnt) | |
1375 | continue; | |
0e54c899 VK |
1376 | lprops = ubifs_lpt_lookup(c, lnum); |
1377 | if (IS_ERR(lprops)) { | |
1378 | err = PTR_ERR(lprops); | |
1379 | goto out; | |
1380 | } | |
1e51764a AB |
1381 | } |
1382 | out: | |
1383 | vfree(buf); | |
1384 | return err; | |
1385 | } | |
1386 | ||
1387 | /** | |
1388 | * ubifs_get_nnode - get a nnode. | |
1389 | * @c: UBIFS file-system description object | |
1390 | * @parent: parent nnode (or NULL for the root) | |
1391 | * @iip: index in parent | |
1392 | * | |
1393 | * This function returns a pointer to the nnode on success or a negative error | |
1394 | * code on failure. | |
1395 | */ | |
1396 | struct ubifs_nnode *ubifs_get_nnode(struct ubifs_info *c, | |
1397 | struct ubifs_nnode *parent, int iip) | |
1398 | { | |
1399 | struct ubifs_nbranch *branch; | |
1400 | struct ubifs_nnode *nnode; | |
1401 | int err; | |
1402 | ||
1403 | branch = &parent->nbranch[iip]; | |
1404 | nnode = branch->nnode; | |
1405 | if (nnode) | |
1406 | return nnode; | |
1407 | err = ubifs_read_nnode(c, parent, iip); | |
1408 | if (err) | |
1409 | return ERR_PTR(err); | |
1410 | return branch->nnode; | |
1411 | } | |
1412 | ||
1413 | /** | |
1414 | * ubifs_get_pnode - get a pnode. | |
1415 | * @c: UBIFS file-system description object | |
1416 | * @parent: parent nnode | |
1417 | * @iip: index in parent | |
1418 | * | |
1419 | * This function returns a pointer to the pnode on success or a negative error | |
1420 | * code on failure. | |
1421 | */ | |
1422 | struct ubifs_pnode *ubifs_get_pnode(struct ubifs_info *c, | |
1423 | struct ubifs_nnode *parent, int iip) | |
1424 | { | |
1425 | struct ubifs_nbranch *branch; | |
1426 | struct ubifs_pnode *pnode; | |
1427 | int err; | |
1428 | ||
1429 | branch = &parent->nbranch[iip]; | |
1430 | pnode = branch->pnode; | |
1431 | if (pnode) | |
1432 | return pnode; | |
1433 | err = read_pnode(c, parent, iip); | |
1434 | if (err) | |
1435 | return ERR_PTR(err); | |
1436 | update_cats(c, branch->pnode); | |
1437 | return branch->pnode; | |
1438 | } | |
1439 | ||
1440 | /** | |
1441 | * ubifs_lpt_lookup - lookup LEB properties in the LPT. | |
1442 | * @c: UBIFS file-system description object | |
1443 | * @lnum: LEB number to lookup | |
1444 | * | |
1445 | * This function returns a pointer to the LEB properties on success or a | |
1446 | * negative error code on failure. | |
1447 | */ | |
1448 | struct ubifs_lprops *ubifs_lpt_lookup(struct ubifs_info *c, int lnum) | |
1449 | { | |
1450 | int err, i, h, iip, shft; | |
1451 | struct ubifs_nnode *nnode; | |
1452 | struct ubifs_pnode *pnode; | |
1453 | ||
1454 | if (!c->nroot) { | |
1455 | err = ubifs_read_nnode(c, NULL, 0); | |
1456 | if (err) | |
1457 | return ERR_PTR(err); | |
1458 | } | |
1459 | nnode = c->nroot; | |
1460 | i = lnum - c->main_first; | |
1461 | shft = c->lpt_hght * UBIFS_LPT_FANOUT_SHIFT; | |
1462 | for (h = 1; h < c->lpt_hght; h++) { | |
1463 | iip = ((i >> shft) & (UBIFS_LPT_FANOUT - 1)); | |
1464 | shft -= UBIFS_LPT_FANOUT_SHIFT; | |
1465 | nnode = ubifs_get_nnode(c, nnode, iip); | |
1466 | if (IS_ERR(nnode)) | |
6da5156f | 1467 | return ERR_CAST(nnode); |
1e51764a AB |
1468 | } |
1469 | iip = ((i >> shft) & (UBIFS_LPT_FANOUT - 1)); | |
1470 | shft -= UBIFS_LPT_FANOUT_SHIFT; | |
1471 | pnode = ubifs_get_pnode(c, nnode, iip); | |
1472 | if (IS_ERR(pnode)) | |
6da5156f | 1473 | return ERR_CAST(pnode); |
1e51764a AB |
1474 | iip = (i & (UBIFS_LPT_FANOUT - 1)); |
1475 | dbg_lp("LEB %d, free %d, dirty %d, flags %d", lnum, | |
1476 | pnode->lprops[iip].free, pnode->lprops[iip].dirty, | |
1477 | pnode->lprops[iip].flags); | |
1478 | return &pnode->lprops[iip]; | |
1479 | } | |
1480 | ||
1481 | /** | |
1482 | * dirty_cow_nnode - ensure a nnode is not being committed. | |
1483 | * @c: UBIFS file-system description object | |
1484 | * @nnode: nnode to check | |
1485 | * | |
1486 | * Returns dirtied nnode on success or negative error code on failure. | |
1487 | */ | |
1488 | static struct ubifs_nnode *dirty_cow_nnode(struct ubifs_info *c, | |
1489 | struct ubifs_nnode *nnode) | |
1490 | { | |
1491 | struct ubifs_nnode *n; | |
1492 | int i; | |
1493 | ||
1494 | if (!test_bit(COW_CNODE, &nnode->flags)) { | |
1495 | /* nnode is not being committed */ | |
1496 | if (!test_and_set_bit(DIRTY_CNODE, &nnode->flags)) { | |
1497 | c->dirty_nn_cnt += 1; | |
1498 | ubifs_add_nnode_dirt(c, nnode); | |
1499 | } | |
1500 | return nnode; | |
1501 | } | |
1502 | ||
1503 | /* nnode is being committed, so copy it */ | |
1504 | n = kmalloc(sizeof(struct ubifs_nnode), GFP_NOFS); | |
1505 | if (unlikely(!n)) | |
1506 | return ERR_PTR(-ENOMEM); | |
1507 | ||
1508 | memcpy(n, nnode, sizeof(struct ubifs_nnode)); | |
1509 | n->cnext = NULL; | |
1510 | __set_bit(DIRTY_CNODE, &n->flags); | |
1511 | __clear_bit(COW_CNODE, &n->flags); | |
1512 | ||
1513 | /* The children now have new parent */ | |
1514 | for (i = 0; i < UBIFS_LPT_FANOUT; i++) { | |
1515 | struct ubifs_nbranch *branch = &n->nbranch[i]; | |
1516 | ||
1517 | if (branch->cnode) | |
1518 | branch->cnode->parent = n; | |
1519 | } | |
1520 | ||
1521 | ubifs_assert(!test_bit(OBSOLETE_CNODE, &nnode->flags)); | |
1522 | __set_bit(OBSOLETE_CNODE, &nnode->flags); | |
1523 | ||
1524 | c->dirty_nn_cnt += 1; | |
1525 | ubifs_add_nnode_dirt(c, nnode); | |
1526 | if (nnode->parent) | |
1527 | nnode->parent->nbranch[n->iip].nnode = n; | |
1528 | else | |
1529 | c->nroot = n; | |
1530 | return n; | |
1531 | } | |
1532 | ||
1533 | /** | |
1534 | * dirty_cow_pnode - ensure a pnode is not being committed. | |
1535 | * @c: UBIFS file-system description object | |
1536 | * @pnode: pnode to check | |
1537 | * | |
1538 | * Returns dirtied pnode on success or negative error code on failure. | |
1539 | */ | |
1540 | static struct ubifs_pnode *dirty_cow_pnode(struct ubifs_info *c, | |
1541 | struct ubifs_pnode *pnode) | |
1542 | { | |
1543 | struct ubifs_pnode *p; | |
1544 | ||
1545 | if (!test_bit(COW_CNODE, &pnode->flags)) { | |
1546 | /* pnode is not being committed */ | |
1547 | if (!test_and_set_bit(DIRTY_CNODE, &pnode->flags)) { | |
1548 | c->dirty_pn_cnt += 1; | |
1549 | add_pnode_dirt(c, pnode); | |
1550 | } | |
1551 | return pnode; | |
1552 | } | |
1553 | ||
1554 | /* pnode is being committed, so copy it */ | |
1555 | p = kmalloc(sizeof(struct ubifs_pnode), GFP_NOFS); | |
1556 | if (unlikely(!p)) | |
1557 | return ERR_PTR(-ENOMEM); | |
1558 | ||
1559 | memcpy(p, pnode, sizeof(struct ubifs_pnode)); | |
1560 | p->cnext = NULL; | |
1561 | __set_bit(DIRTY_CNODE, &p->flags); | |
1562 | __clear_bit(COW_CNODE, &p->flags); | |
1563 | replace_cats(c, pnode, p); | |
1564 | ||
1565 | ubifs_assert(!test_bit(OBSOLETE_CNODE, &pnode->flags)); | |
1566 | __set_bit(OBSOLETE_CNODE, &pnode->flags); | |
1567 | ||
1568 | c->dirty_pn_cnt += 1; | |
1569 | add_pnode_dirt(c, pnode); | |
1570 | pnode->parent->nbranch[p->iip].pnode = p; | |
1571 | return p; | |
1572 | } | |
1573 | ||
1574 | /** | |
1575 | * ubifs_lpt_lookup_dirty - lookup LEB properties in the LPT. | |
1576 | * @c: UBIFS file-system description object | |
1577 | * @lnum: LEB number to lookup | |
1578 | * | |
1579 | * This function returns a pointer to the LEB properties on success or a | |
1580 | * negative error code on failure. | |
1581 | */ | |
1582 | struct ubifs_lprops *ubifs_lpt_lookup_dirty(struct ubifs_info *c, int lnum) | |
1583 | { | |
1584 | int err, i, h, iip, shft; | |
1585 | struct ubifs_nnode *nnode; | |
1586 | struct ubifs_pnode *pnode; | |
1587 | ||
1588 | if (!c->nroot) { | |
1589 | err = ubifs_read_nnode(c, NULL, 0); | |
1590 | if (err) | |
1591 | return ERR_PTR(err); | |
1592 | } | |
1593 | nnode = c->nroot; | |
1594 | nnode = dirty_cow_nnode(c, nnode); | |
1595 | if (IS_ERR(nnode)) | |
6da5156f | 1596 | return ERR_CAST(nnode); |
1e51764a AB |
1597 | i = lnum - c->main_first; |
1598 | shft = c->lpt_hght * UBIFS_LPT_FANOUT_SHIFT; | |
1599 | for (h = 1; h < c->lpt_hght; h++) { | |
1600 | iip = ((i >> shft) & (UBIFS_LPT_FANOUT - 1)); | |
1601 | shft -= UBIFS_LPT_FANOUT_SHIFT; | |
1602 | nnode = ubifs_get_nnode(c, nnode, iip); | |
1603 | if (IS_ERR(nnode)) | |
6da5156f | 1604 | return ERR_CAST(nnode); |
1e51764a AB |
1605 | nnode = dirty_cow_nnode(c, nnode); |
1606 | if (IS_ERR(nnode)) | |
6da5156f | 1607 | return ERR_CAST(nnode); |
1e51764a AB |
1608 | } |
1609 | iip = ((i >> shft) & (UBIFS_LPT_FANOUT - 1)); | |
1610 | shft -= UBIFS_LPT_FANOUT_SHIFT; | |
1611 | pnode = ubifs_get_pnode(c, nnode, iip); | |
1612 | if (IS_ERR(pnode)) | |
6da5156f | 1613 | return ERR_CAST(pnode); |
1e51764a AB |
1614 | pnode = dirty_cow_pnode(c, pnode); |
1615 | if (IS_ERR(pnode)) | |
6da5156f | 1616 | return ERR_CAST(pnode); |
1e51764a AB |
1617 | iip = (i & (UBIFS_LPT_FANOUT - 1)); |
1618 | dbg_lp("LEB %d, free %d, dirty %d, flags %d", lnum, | |
1619 | pnode->lprops[iip].free, pnode->lprops[iip].dirty, | |
1620 | pnode->lprops[iip].flags); | |
1621 | ubifs_assert(test_bit(DIRTY_CNODE, &pnode->flags)); | |
1622 | return &pnode->lprops[iip]; | |
1623 | } | |
1624 | ||
1625 | /** | |
1626 | * lpt_init_rd - initialize the LPT for reading. | |
1627 | * @c: UBIFS file-system description object | |
1628 | * | |
1629 | * This function returns %0 on success and a negative error code on failure. | |
1630 | */ | |
1631 | static int lpt_init_rd(struct ubifs_info *c) | |
1632 | { | |
1633 | int err, i; | |
1634 | ||
1635 | c->ltab = vmalloc(sizeof(struct ubifs_lpt_lprops) * c->lpt_lebs); | |
1636 | if (!c->ltab) | |
1637 | return -ENOMEM; | |
1638 | ||
1639 | i = max_t(int, c->nnode_sz, c->pnode_sz); | |
1640 | c->lpt_nod_buf = kmalloc(i, GFP_KERNEL); | |
1641 | if (!c->lpt_nod_buf) | |
1642 | return -ENOMEM; | |
1643 | ||
1644 | for (i = 0; i < LPROPS_HEAP_CNT; i++) { | |
1645 | c->lpt_heap[i].arr = kmalloc(sizeof(void *) * LPT_HEAP_SZ, | |
1646 | GFP_KERNEL); | |
1647 | if (!c->lpt_heap[i].arr) | |
1648 | return -ENOMEM; | |
1649 | c->lpt_heap[i].cnt = 0; | |
1650 | c->lpt_heap[i].max_cnt = LPT_HEAP_SZ; | |
1651 | } | |
1652 | ||
1653 | c->dirty_idx.arr = kmalloc(sizeof(void *) * LPT_HEAP_SZ, GFP_KERNEL); | |
1654 | if (!c->dirty_idx.arr) | |
1655 | return -ENOMEM; | |
1656 | c->dirty_idx.cnt = 0; | |
1657 | c->dirty_idx.max_cnt = LPT_HEAP_SZ; | |
1658 | ||
1659 | err = read_ltab(c); | |
1660 | if (err) | |
1661 | return err; | |
1662 | ||
1663 | dbg_lp("space_bits %d", c->space_bits); | |
1664 | dbg_lp("lpt_lnum_bits %d", c->lpt_lnum_bits); | |
1665 | dbg_lp("lpt_offs_bits %d", c->lpt_offs_bits); | |
1666 | dbg_lp("lpt_spc_bits %d", c->lpt_spc_bits); | |
1667 | dbg_lp("pcnt_bits %d", c->pcnt_bits); | |
1668 | dbg_lp("lnum_bits %d", c->lnum_bits); | |
1669 | dbg_lp("pnode_sz %d", c->pnode_sz); | |
1670 | dbg_lp("nnode_sz %d", c->nnode_sz); | |
1671 | dbg_lp("ltab_sz %d", c->ltab_sz); | |
1672 | dbg_lp("lsave_sz %d", c->lsave_sz); | |
1673 | dbg_lp("lsave_cnt %d", c->lsave_cnt); | |
1674 | dbg_lp("lpt_hght %d", c->lpt_hght); | |
1675 | dbg_lp("big_lpt %d", c->big_lpt); | |
1676 | dbg_lp("LPT root is at %d:%d", c->lpt_lnum, c->lpt_offs); | |
1677 | dbg_lp("LPT head is at %d:%d", c->nhead_lnum, c->nhead_offs); | |
1678 | dbg_lp("LPT ltab is at %d:%d", c->ltab_lnum, c->ltab_offs); | |
1679 | if (c->big_lpt) | |
1680 | dbg_lp("LPT lsave is at %d:%d", c->lsave_lnum, c->lsave_offs); | |
1681 | ||
1682 | return 0; | |
1683 | } | |
1684 | ||
1685 | /** | |
1686 | * lpt_init_wr - initialize the LPT for writing. | |
1687 | * @c: UBIFS file-system description object | |
1688 | * | |
1689 | * 'lpt_init_rd()' must have been called already. | |
1690 | * | |
1691 | * This function returns %0 on success and a negative error code on failure. | |
1692 | */ | |
1693 | static int lpt_init_wr(struct ubifs_info *c) | |
1694 | { | |
1695 | int err, i; | |
1696 | ||
1697 | c->ltab_cmt = vmalloc(sizeof(struct ubifs_lpt_lprops) * c->lpt_lebs); | |
1698 | if (!c->ltab_cmt) | |
1699 | return -ENOMEM; | |
1700 | ||
1701 | c->lpt_buf = vmalloc(c->leb_size); | |
1702 | if (!c->lpt_buf) | |
1703 | return -ENOMEM; | |
1704 | ||
1705 | if (c->big_lpt) { | |
1706 | c->lsave = kmalloc(sizeof(int) * c->lsave_cnt, GFP_NOFS); | |
1707 | if (!c->lsave) | |
1708 | return -ENOMEM; | |
1709 | err = read_lsave(c); | |
1710 | if (err) | |
1711 | return err; | |
1712 | } | |
1713 | ||
1714 | for (i = 0; i < c->lpt_lebs; i++) | |
1715 | if (c->ltab[i].free == c->leb_size) { | |
1716 | err = ubifs_leb_unmap(c, i + c->lpt_first); | |
1717 | if (err) | |
1718 | return err; | |
1719 | } | |
1720 | ||
1721 | return 0; | |
1722 | } | |
1723 | ||
1724 | /** | |
1725 | * ubifs_lpt_init - initialize the LPT. | |
1726 | * @c: UBIFS file-system description object | |
1727 | * @rd: whether to initialize lpt for reading | |
1728 | * @wr: whether to initialize lpt for writing | |
1729 | * | |
1730 | * For mounting 'rw', @rd and @wr are both true. For mounting 'ro', @rd is true | |
1731 | * and @wr is false. For mounting from 'ro' to 'rw', @rd is false and @wr is | |
1732 | * true. | |
1733 | * | |
1734 | * This function returns %0 on success and a negative error code on failure. | |
1735 | */ | |
1736 | int ubifs_lpt_init(struct ubifs_info *c, int rd, int wr) | |
1737 | { | |
1738 | int err; | |
1739 | ||
1740 | if (rd) { | |
1741 | err = lpt_init_rd(c); | |
1742 | if (err) | |
1743 | return err; | |
1744 | } | |
1745 | ||
1746 | if (wr) { | |
1747 | err = lpt_init_wr(c); | |
1748 | if (err) | |
1749 | return err; | |
1750 | } | |
1751 | ||
1752 | return 0; | |
1753 | } | |
1754 | ||
1755 | /** | |
1756 | * struct lpt_scan_node - somewhere to put nodes while we scan LPT. | |
1757 | * @nnode: where to keep a nnode | |
1758 | * @pnode: where to keep a pnode | |
1759 | * @cnode: where to keep a cnode | |
1760 | * @in_tree: is the node in the tree in memory | |
1761 | * @ptr.nnode: pointer to the nnode (if it is an nnode) which may be here or in | |
1762 | * the tree | |
1763 | * @ptr.pnode: ditto for pnode | |
1764 | * @ptr.cnode: ditto for cnode | |
1765 | */ | |
1766 | struct lpt_scan_node { | |
1767 | union { | |
1768 | struct ubifs_nnode nnode; | |
1769 | struct ubifs_pnode pnode; | |
1770 | struct ubifs_cnode cnode; | |
1771 | }; | |
1772 | int in_tree; | |
1773 | union { | |
1774 | struct ubifs_nnode *nnode; | |
1775 | struct ubifs_pnode *pnode; | |
1776 | struct ubifs_cnode *cnode; | |
1777 | } ptr; | |
1778 | }; | |
1779 | ||
1780 | /** | |
1781 | * scan_get_nnode - for the scan, get a nnode from either the tree or flash. | |
1782 | * @c: the UBIFS file-system description object | |
1783 | * @path: where to put the nnode | |
1784 | * @parent: parent of the nnode | |
1785 | * @iip: index in parent of the nnode | |
1786 | * | |
1787 | * This function returns a pointer to the nnode on success or a negative error | |
1788 | * code on failure. | |
1789 | */ | |
1790 | static struct ubifs_nnode *scan_get_nnode(struct ubifs_info *c, | |
1791 | struct lpt_scan_node *path, | |
1792 | struct ubifs_nnode *parent, int iip) | |
1793 | { | |
1794 | struct ubifs_nbranch *branch; | |
1795 | struct ubifs_nnode *nnode; | |
1796 | void *buf = c->lpt_nod_buf; | |
1797 | int err; | |
1798 | ||
1799 | branch = &parent->nbranch[iip]; | |
1800 | nnode = branch->nnode; | |
1801 | if (nnode) { | |
1802 | path->in_tree = 1; | |
1803 | path->ptr.nnode = nnode; | |
1804 | return nnode; | |
1805 | } | |
1806 | nnode = &path->nnode; | |
1807 | path->in_tree = 0; | |
1808 | path->ptr.nnode = nnode; | |
1809 | memset(nnode, 0, sizeof(struct ubifs_nnode)); | |
1810 | if (branch->lnum == 0) { | |
1811 | /* | |
1812 | * This nnode was not written which just means that the LEB | |
1813 | * properties in the subtree below it describe empty LEBs. We | |
1814 | * make the nnode as though we had read it, which in fact means | |
1815 | * doing almost nothing. | |
1816 | */ | |
1817 | if (c->big_lpt) | |
1818 | nnode->num = calc_nnode_num_from_parent(c, parent, iip); | |
1819 | } else { | |
d304820a AB |
1820 | err = ubifs_leb_read(c, branch->lnum, buf, branch->offs, |
1821 | c->nnode_sz, 1); | |
1e51764a AB |
1822 | if (err) |
1823 | return ERR_PTR(err); | |
2ba5f7ae | 1824 | err = ubifs_unpack_nnode(c, buf, nnode); |
1e51764a AB |
1825 | if (err) |
1826 | return ERR_PTR(err); | |
1827 | } | |
1828 | err = validate_nnode(c, nnode, parent, iip); | |
1829 | if (err) | |
1830 | return ERR_PTR(err); | |
1831 | if (!c->big_lpt) | |
1832 | nnode->num = calc_nnode_num_from_parent(c, parent, iip); | |
1833 | nnode->level = parent->level - 1; | |
1834 | nnode->parent = parent; | |
1835 | nnode->iip = iip; | |
1836 | return nnode; | |
1837 | } | |
1838 | ||
1839 | /** | |
1840 | * scan_get_pnode - for the scan, get a pnode from either the tree or flash. | |
1841 | * @c: the UBIFS file-system description object | |
1842 | * @path: where to put the pnode | |
1843 | * @parent: parent of the pnode | |
1844 | * @iip: index in parent of the pnode | |
1845 | * | |
1846 | * This function returns a pointer to the pnode on success or a negative error | |
1847 | * code on failure. | |
1848 | */ | |
1849 | static struct ubifs_pnode *scan_get_pnode(struct ubifs_info *c, | |
1850 | struct lpt_scan_node *path, | |
1851 | struct ubifs_nnode *parent, int iip) | |
1852 | { | |
1853 | struct ubifs_nbranch *branch; | |
1854 | struct ubifs_pnode *pnode; | |
1855 | void *buf = c->lpt_nod_buf; | |
1856 | int err; | |
1857 | ||
1858 | branch = &parent->nbranch[iip]; | |
1859 | pnode = branch->pnode; | |
1860 | if (pnode) { | |
1861 | path->in_tree = 1; | |
1862 | path->ptr.pnode = pnode; | |
1863 | return pnode; | |
1864 | } | |
1865 | pnode = &path->pnode; | |
1866 | path->in_tree = 0; | |
1867 | path->ptr.pnode = pnode; | |
1868 | memset(pnode, 0, sizeof(struct ubifs_pnode)); | |
1869 | if (branch->lnum == 0) { | |
1870 | /* | |
1871 | * This pnode was not written which just means that the LEB | |
1872 | * properties in it describe empty LEBs. We make the pnode as | |
1873 | * though we had read it. | |
1874 | */ | |
1875 | int i; | |
1876 | ||
1877 | if (c->big_lpt) | |
1878 | pnode->num = calc_pnode_num_from_parent(c, parent, iip); | |
1879 | for (i = 0; i < UBIFS_LPT_FANOUT; i++) { | |
1880 | struct ubifs_lprops * const lprops = &pnode->lprops[i]; | |
1881 | ||
1882 | lprops->free = c->leb_size; | |
1883 | lprops->flags = ubifs_categorize_lprops(c, lprops); | |
1884 | } | |
1885 | } else { | |
1886 | ubifs_assert(branch->lnum >= c->lpt_first && | |
1887 | branch->lnum <= c->lpt_last); | |
1888 | ubifs_assert(branch->offs >= 0 && branch->offs < c->leb_size); | |
d304820a AB |
1889 | err = ubifs_leb_read(c, branch->lnum, buf, branch->offs, |
1890 | c->pnode_sz, 1); | |
1e51764a AB |
1891 | if (err) |
1892 | return ERR_PTR(err); | |
1893 | err = unpack_pnode(c, buf, pnode); | |
1894 | if (err) | |
1895 | return ERR_PTR(err); | |
1896 | } | |
1897 | err = validate_pnode(c, pnode, parent, iip); | |
1898 | if (err) | |
1899 | return ERR_PTR(err); | |
1900 | if (!c->big_lpt) | |
1901 | pnode->num = calc_pnode_num_from_parent(c, parent, iip); | |
1902 | pnode->parent = parent; | |
1903 | pnode->iip = iip; | |
1904 | set_pnode_lnum(c, pnode); | |
1905 | return pnode; | |
1906 | } | |
1907 | ||
1908 | /** | |
1909 | * ubifs_lpt_scan_nolock - scan the LPT. | |
1910 | * @c: the UBIFS file-system description object | |
1911 | * @start_lnum: LEB number from which to start scanning | |
1912 | * @end_lnum: LEB number at which to stop scanning | |
1913 | * @scan_cb: callback function called for each lprops | |
1914 | * @data: data to be passed to the callback function | |
1915 | * | |
1916 | * This function returns %0 on success and a negative error code on failure. | |
1917 | */ | |
1918 | int ubifs_lpt_scan_nolock(struct ubifs_info *c, int start_lnum, int end_lnum, | |
1919 | ubifs_lpt_scan_callback scan_cb, void *data) | |
1920 | { | |
1921 | int err = 0, i, h, iip, shft; | |
1922 | struct ubifs_nnode *nnode; | |
1923 | struct ubifs_pnode *pnode; | |
1924 | struct lpt_scan_node *path; | |
1925 | ||
1926 | if (start_lnum == -1) { | |
1927 | start_lnum = end_lnum + 1; | |
1928 | if (start_lnum >= c->leb_cnt) | |
1929 | start_lnum = c->main_first; | |
1930 | } | |
1931 | ||
1932 | ubifs_assert(start_lnum >= c->main_first && start_lnum < c->leb_cnt); | |
1933 | ubifs_assert(end_lnum >= c->main_first && end_lnum < c->leb_cnt); | |
1934 | ||
1935 | if (!c->nroot) { | |
1936 | err = ubifs_read_nnode(c, NULL, 0); | |
1937 | if (err) | |
1938 | return err; | |
1939 | } | |
1940 | ||
1941 | path = kmalloc(sizeof(struct lpt_scan_node) * (c->lpt_hght + 1), | |
1942 | GFP_NOFS); | |
1943 | if (!path) | |
1944 | return -ENOMEM; | |
1945 | ||
1946 | path[0].ptr.nnode = c->nroot; | |
1947 | path[0].in_tree = 1; | |
1948 | again: | |
1949 | /* Descend to the pnode containing start_lnum */ | |
1950 | nnode = c->nroot; | |
1951 | i = start_lnum - c->main_first; | |
1952 | shft = c->lpt_hght * UBIFS_LPT_FANOUT_SHIFT; | |
1953 | for (h = 1; h < c->lpt_hght; h++) { | |
1954 | iip = ((i >> shft) & (UBIFS_LPT_FANOUT - 1)); | |
1955 | shft -= UBIFS_LPT_FANOUT_SHIFT; | |
1956 | nnode = scan_get_nnode(c, path + h, nnode, iip); | |
1957 | if (IS_ERR(nnode)) { | |
1958 | err = PTR_ERR(nnode); | |
1959 | goto out; | |
1960 | } | |
1961 | } | |
1962 | iip = ((i >> shft) & (UBIFS_LPT_FANOUT - 1)); | |
1963 | shft -= UBIFS_LPT_FANOUT_SHIFT; | |
1964 | pnode = scan_get_pnode(c, path + h, nnode, iip); | |
1965 | if (IS_ERR(pnode)) { | |
1966 | err = PTR_ERR(pnode); | |
1967 | goto out; | |
1968 | } | |
1969 | iip = (i & (UBIFS_LPT_FANOUT - 1)); | |
1970 | ||
1971 | /* Loop for each lprops */ | |
1972 | while (1) { | |
1973 | struct ubifs_lprops *lprops = &pnode->lprops[iip]; | |
1974 | int ret, lnum = lprops->lnum; | |
1975 | ||
1976 | ret = scan_cb(c, lprops, path[h].in_tree, data); | |
1977 | if (ret < 0) { | |
1978 | err = ret; | |
1979 | goto out; | |
1980 | } | |
1981 | if (ret & LPT_SCAN_ADD) { | |
1982 | /* Add all the nodes in path to the tree in memory */ | |
1983 | for (h = 1; h < c->lpt_hght; h++) { | |
1984 | const size_t sz = sizeof(struct ubifs_nnode); | |
1985 | struct ubifs_nnode *parent; | |
1986 | ||
1987 | if (path[h].in_tree) | |
1988 | continue; | |
1989 | nnode = kmalloc(sz, GFP_NOFS); | |
1990 | if (!nnode) { | |
1991 | err = -ENOMEM; | |
1992 | goto out; | |
1993 | } | |
1994 | memcpy(nnode, &path[h].nnode, sz); | |
1995 | parent = nnode->parent; | |
1996 | parent->nbranch[nnode->iip].nnode = nnode; | |
1997 | path[h].ptr.nnode = nnode; | |
1998 | path[h].in_tree = 1; | |
1999 | path[h + 1].cnode.parent = nnode; | |
2000 | } | |
2001 | if (path[h].in_tree) | |
2002 | ubifs_ensure_cat(c, lprops); | |
2003 | else { | |
2004 | const size_t sz = sizeof(struct ubifs_pnode); | |
2005 | struct ubifs_nnode *parent; | |
2006 | ||
2007 | pnode = kmalloc(sz, GFP_NOFS); | |
2008 | if (!pnode) { | |
2009 | err = -ENOMEM; | |
2010 | goto out; | |
2011 | } | |
2012 | memcpy(pnode, &path[h].pnode, sz); | |
2013 | parent = pnode->parent; | |
2014 | parent->nbranch[pnode->iip].pnode = pnode; | |
2015 | path[h].ptr.pnode = pnode; | |
2016 | path[h].in_tree = 1; | |
2017 | update_cats(c, pnode); | |
2018 | c->pnodes_have += 1; | |
2019 | } | |
2020 | err = dbg_check_lpt_nodes(c, (struct ubifs_cnode *) | |
2021 | c->nroot, 0, 0); | |
2022 | if (err) | |
2023 | goto out; | |
2024 | err = dbg_check_cats(c); | |
2025 | if (err) | |
2026 | goto out; | |
2027 | } | |
2028 | if (ret & LPT_SCAN_STOP) { | |
2029 | err = 0; | |
2030 | break; | |
2031 | } | |
2032 | /* Get the next lprops */ | |
2033 | if (lnum == end_lnum) { | |
2034 | /* | |
2035 | * We got to the end without finding what we were | |
2036 | * looking for | |
2037 | */ | |
2038 | err = -ENOSPC; | |
2039 | goto out; | |
2040 | } | |
2041 | if (lnum + 1 >= c->leb_cnt) { | |
2042 | /* Wrap-around to the beginning */ | |
2043 | start_lnum = c->main_first; | |
2044 | goto again; | |
2045 | } | |
2046 | if (iip + 1 < UBIFS_LPT_FANOUT) { | |
2047 | /* Next lprops is in the same pnode */ | |
2048 | iip += 1; | |
2049 | continue; | |
2050 | } | |
2051 | /* We need to get the next pnode. Go up until we can go right */ | |
2052 | iip = pnode->iip; | |
2053 | while (1) { | |
2054 | h -= 1; | |
2055 | ubifs_assert(h >= 0); | |
2056 | nnode = path[h].ptr.nnode; | |
2057 | if (iip + 1 < UBIFS_LPT_FANOUT) | |
2058 | break; | |
2059 | iip = nnode->iip; | |
2060 | } | |
2061 | /* Go right */ | |
2062 | iip += 1; | |
2063 | /* Descend to the pnode */ | |
2064 | h += 1; | |
2065 | for (; h < c->lpt_hght; h++) { | |
2066 | nnode = scan_get_nnode(c, path + h, nnode, iip); | |
2067 | if (IS_ERR(nnode)) { | |
2068 | err = PTR_ERR(nnode); | |
2069 | goto out; | |
2070 | } | |
2071 | iip = 0; | |
2072 | } | |
2073 | pnode = scan_get_pnode(c, path + h, nnode, iip); | |
2074 | if (IS_ERR(pnode)) { | |
2075 | err = PTR_ERR(pnode); | |
2076 | goto out; | |
2077 | } | |
2078 | iip = 0; | |
2079 | } | |
2080 | out: | |
2081 | kfree(path); | |
2082 | return err; | |
2083 | } | |
2084 | ||
2085 | #ifdef CONFIG_UBIFS_FS_DEBUG | |
2086 | ||
2087 | /** | |
2088 | * dbg_chk_pnode - check a pnode. | |
2089 | * @c: the UBIFS file-system description object | |
2090 | * @pnode: pnode to check | |
2091 | * @col: pnode column | |
2092 | * | |
2093 | * This function returns %0 on success and a negative error code on failure. | |
2094 | */ | |
2095 | static int dbg_chk_pnode(struct ubifs_info *c, struct ubifs_pnode *pnode, | |
2096 | int col) | |
2097 | { | |
2098 | int i; | |
2099 | ||
2100 | if (pnode->num != col) { | |
2101 | dbg_err("pnode num %d expected %d parent num %d iip %d", | |
2102 | pnode->num, col, pnode->parent->num, pnode->iip); | |
2103 | return -EINVAL; | |
2104 | } | |
2105 | for (i = 0; i < UBIFS_LPT_FANOUT; i++) { | |
2106 | struct ubifs_lprops *lp, *lprops = &pnode->lprops[i]; | |
2107 | int lnum = (pnode->num << UBIFS_LPT_FANOUT_SHIFT) + i + | |
2108 | c->main_first; | |
2109 | int found, cat = lprops->flags & LPROPS_CAT_MASK; | |
2110 | struct ubifs_lpt_heap *heap; | |
2111 | struct list_head *list = NULL; | |
2112 | ||
2113 | if (lnum >= c->leb_cnt) | |
2114 | continue; | |
2115 | if (lprops->lnum != lnum) { | |
2116 | dbg_err("bad LEB number %d expected %d", | |
2117 | lprops->lnum, lnum); | |
2118 | return -EINVAL; | |
2119 | } | |
2120 | if (lprops->flags & LPROPS_TAKEN) { | |
2121 | if (cat != LPROPS_UNCAT) { | |
2122 | dbg_err("LEB %d taken but not uncat %d", | |
2123 | lprops->lnum, cat); | |
2124 | return -EINVAL; | |
2125 | } | |
2126 | continue; | |
2127 | } | |
2128 | if (lprops->flags & LPROPS_INDEX) { | |
2129 | switch (cat) { | |
2130 | case LPROPS_UNCAT: | |
2131 | case LPROPS_DIRTY_IDX: | |
2132 | case LPROPS_FRDI_IDX: | |
2133 | break; | |
2134 | default: | |
2135 | dbg_err("LEB %d index but cat %d", | |
2136 | lprops->lnum, cat); | |
2137 | return -EINVAL; | |
2138 | } | |
2139 | } else { | |
2140 | switch (cat) { | |
2141 | case LPROPS_UNCAT: | |
2142 | case LPROPS_DIRTY: | |
2143 | case LPROPS_FREE: | |
2144 | case LPROPS_EMPTY: | |
2145 | case LPROPS_FREEABLE: | |
2146 | break; | |
2147 | default: | |
2148 | dbg_err("LEB %d not index but cat %d", | |
2149 | lprops->lnum, cat); | |
2150 | return -EINVAL; | |
2151 | } | |
2152 | } | |
2153 | switch (cat) { | |
2154 | case LPROPS_UNCAT: | |
2155 | list = &c->uncat_list; | |
2156 | break; | |
2157 | case LPROPS_EMPTY: | |
2158 | list = &c->empty_list; | |
2159 | break; | |
2160 | case LPROPS_FREEABLE: | |
2161 | list = &c->freeable_list; | |
2162 | break; | |
2163 | case LPROPS_FRDI_IDX: | |
2164 | list = &c->frdi_idx_list; | |
2165 | break; | |
2166 | } | |
2167 | found = 0; | |
2168 | switch (cat) { | |
2169 | case LPROPS_DIRTY: | |
2170 | case LPROPS_DIRTY_IDX: | |
2171 | case LPROPS_FREE: | |
2172 | heap = &c->lpt_heap[cat - 1]; | |
2173 | if (lprops->hpos < heap->cnt && | |
2174 | heap->arr[lprops->hpos] == lprops) | |
2175 | found = 1; | |
2176 | break; | |
2177 | case LPROPS_UNCAT: | |
2178 | case LPROPS_EMPTY: | |
2179 | case LPROPS_FREEABLE: | |
2180 | case LPROPS_FRDI_IDX: | |
2181 | list_for_each_entry(lp, list, list) | |
2182 | if (lprops == lp) { | |
2183 | found = 1; | |
2184 | break; | |
2185 | } | |
2186 | break; | |
2187 | } | |
2188 | if (!found) { | |
2189 | dbg_err("LEB %d cat %d not found in cat heap/list", | |
2190 | lprops->lnum, cat); | |
2191 | return -EINVAL; | |
2192 | } | |
2193 | switch (cat) { | |
2194 | case LPROPS_EMPTY: | |
2195 | if (lprops->free != c->leb_size) { | |
2196 | dbg_err("LEB %d cat %d free %d dirty %d", | |
2197 | lprops->lnum, cat, lprops->free, | |
2198 | lprops->dirty); | |
2199 | return -EINVAL; | |
2200 | } | |
2201 | case LPROPS_FREEABLE: | |
2202 | case LPROPS_FRDI_IDX: | |
2203 | if (lprops->free + lprops->dirty != c->leb_size) { | |
2204 | dbg_err("LEB %d cat %d free %d dirty %d", | |
2205 | lprops->lnum, cat, lprops->free, | |
2206 | lprops->dirty); | |
2207 | return -EINVAL; | |
2208 | } | |
2209 | } | |
2210 | } | |
2211 | return 0; | |
2212 | } | |
2213 | ||
2214 | /** | |
2215 | * dbg_check_lpt_nodes - check nnodes and pnodes. | |
2216 | * @c: the UBIFS file-system description object | |
2217 | * @cnode: next cnode (nnode or pnode) to check | |
2218 | * @row: row of cnode (root is zero) | |
2219 | * @col: column of cnode (leftmost is zero) | |
2220 | * | |
2221 | * This function returns %0 on success and a negative error code on failure. | |
2222 | */ | |
2223 | int dbg_check_lpt_nodes(struct ubifs_info *c, struct ubifs_cnode *cnode, | |
2224 | int row, int col) | |
2225 | { | |
2226 | struct ubifs_nnode *nnode, *nn; | |
2227 | struct ubifs_cnode *cn; | |
2228 | int num, iip = 0, err; | |
2229 | ||
2b1844a8 | 2230 | if (!dbg_is_chk_lprops(c)) |
1e51764a AB |
2231 | return 0; |
2232 | ||
2233 | while (cnode) { | |
2234 | ubifs_assert(row >= 0); | |
2235 | nnode = cnode->parent; | |
2236 | if (cnode->level) { | |
2237 | /* cnode is a nnode */ | |
2238 | num = calc_nnode_num(row, col); | |
2239 | if (cnode->num != num) { | |
2240 | dbg_err("nnode num %d expected %d " | |
2241 | "parent num %d iip %d", cnode->num, num, | |
2242 | (nnode ? nnode->num : 0), cnode->iip); | |
2243 | return -EINVAL; | |
2244 | } | |
2245 | nn = (struct ubifs_nnode *)cnode; | |
2246 | while (iip < UBIFS_LPT_FANOUT) { | |
2247 | cn = nn->nbranch[iip].cnode; | |
2248 | if (cn) { | |
2249 | /* Go down */ | |
2250 | row += 1; | |
2251 | col <<= UBIFS_LPT_FANOUT_SHIFT; | |
2252 | col += iip; | |
2253 | iip = 0; | |
2254 | cnode = cn; | |
2255 | break; | |
2256 | } | |
2257 | /* Go right */ | |
2258 | iip += 1; | |
2259 | } | |
2260 | if (iip < UBIFS_LPT_FANOUT) | |
2261 | continue; | |
2262 | } else { | |
2263 | struct ubifs_pnode *pnode; | |
2264 | ||
2265 | /* cnode is a pnode */ | |
2266 | pnode = (struct ubifs_pnode *)cnode; | |
2267 | err = dbg_chk_pnode(c, pnode, col); | |
2268 | if (err) | |
2269 | return err; | |
2270 | } | |
2271 | /* Go up and to the right */ | |
2272 | row -= 1; | |
2273 | col >>= UBIFS_LPT_FANOUT_SHIFT; | |
2274 | iip = cnode->iip + 1; | |
2275 | cnode = (struct ubifs_cnode *)nnode; | |
2276 | } | |
2277 | return 0; | |
2278 | } | |
2279 | ||
2280 | #endif /* CONFIG_UBIFS_FS_DEBUG */ |