Commit | Line | Data |
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801c135c AB |
1 | /* |
2 | * Copyright (c) International Business Machines Corp., 2006 | |
3 | * Copyright (c) Nokia Corporation, 2006, 2007 | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License as published by | |
7 | * the Free Software Foundation; either version 2 of the License, or | |
8 | * (at your option) any later version. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See | |
13 | * the GNU General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with this program; if not, write to the Free Software | |
17 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
18 | * | |
19 | * Author: Artem Bityutskiy (Битюцкий Артём) | |
20 | */ | |
21 | ||
22 | /* | |
23 | * This file includes volume table manipulation code. The volume table is an | |
24 | * on-flash table containing volume meta-data like name, number of reserved | |
25 | * physical eraseblocks, type, etc. The volume table is stored in the so-called | |
26 | * "layout volume". | |
27 | * | |
28 | * The layout volume is an internal volume which is organized as follows. It | |
29 | * consists of two logical eraseblocks - LEB 0 and LEB 1. Each logical | |
30 | * eraseblock stores one volume table copy, i.e. LEB 0 and LEB 1 duplicate each | |
31 | * other. This redundancy guarantees robustness to unclean reboots. The volume | |
32 | * table is basically an array of volume table records. Each record contains | |
b81000b6 RW |
33 | * full information about the volume and protected by a CRC checksum. Note, |
34 | * nowadays we use the atomic LEB change operation when updating the volume | |
35 | * table, so we do not really need 2 LEBs anymore, but we preserve the older | |
36 | * design for the backward compatibility reasons. | |
801c135c | 37 | * |
b81000b6 | 38 | * When the volume table is changed, it is first changed in RAM. Then LEB 0 is |
801c135c AB |
39 | * erased, and the updated volume table is written back to LEB 0. Then same for |
40 | * LEB 1. This scheme guarantees recoverability from unclean reboots. | |
41 | * | |
42 | * In this UBI implementation the on-flash volume table does not contain any | |
fbd0107f | 43 | * information about how much data static volumes contain. |
801c135c AB |
44 | * |
45 | * But it would still be beneficial to store this information in the volume | |
46 | * table. For example, suppose we have a static volume X, and all its physical | |
47 | * eraseblocks became bad for some reasons. Suppose we are attaching the | |
fbd0107f | 48 | * corresponding MTD device, for some reason we find no logical eraseblocks |
801c135c AB |
49 | * corresponding to the volume X. According to the volume table volume X does |
50 | * exist. So we don't know whether it is just empty or all its physical | |
fbd0107f | 51 | * eraseblocks went bad. So we cannot alarm the user properly. |
801c135c AB |
52 | * |
53 | * The volume table also stores so-called "update marker", which is used for | |
54 | * volume updates. Before updating the volume, the update marker is set, and | |
55 | * after the update operation is finished, the update marker is cleared. So if | |
56 | * the update operation was interrupted (e.g. by an unclean reboot) - the | |
57 | * update marker is still there and we know that the volume's contents is | |
58 | * damaged. | |
59 | */ | |
60 | ||
61 | #include <linux/crc32.h> | |
62 | #include <linux/err.h> | |
5a0e3ad6 | 63 | #include <linux/slab.h> |
801c135c AB |
64 | #include <asm/div64.h> |
65 | #include "ubi.h" | |
66 | ||
7bf523ae | 67 | static void self_vtbl_check(const struct ubi_device *ubi); |
801c135c AB |
68 | |
69 | /* Empty volume table record */ | |
70 | static struct ubi_vtbl_record empty_vtbl_record; | |
71 | ||
2848594a | 72 | /** |
73 | * ubi_update_layout_vol - helper for updatting layout volumes on flash | |
74 | * @ubi: UBI device description object | |
75 | */ | |
76 | static int ubi_update_layout_vol(struct ubi_device *ubi) | |
77 | { | |
78 | struct ubi_volume *layout_vol; | |
79 | int i, err; | |
80 | ||
81 | layout_vol = ubi->volumes[vol_id2idx(ubi, UBI_LAYOUT_VOLUME_ID)]; | |
82 | for (i = 0; i < UBI_LAYOUT_VOLUME_EBS; i++) { | |
83 | err = ubi_eba_atomic_leb_change(ubi, layout_vol, i, ubi->vtbl, | |
84 | ubi->vtbl_size); | |
85 | if (err) | |
86 | return err; | |
87 | } | |
88 | ||
89 | return 0; | |
90 | } | |
91 | ||
801c135c AB |
92 | /** |
93 | * ubi_change_vtbl_record - change volume table record. | |
94 | * @ubi: UBI device description object | |
95 | * @idx: table index to change | |
96 | * @vtbl_rec: new volume table record | |
97 | * | |
98 | * This function changes volume table record @idx. If @vtbl_rec is %NULL, empty | |
99 | * volume table record is written. The caller does not have to calculate CRC of | |
100 | * the record as it is done by this function. Returns zero in case of success | |
101 | * and a negative error code in case of failure. | |
102 | */ | |
103 | int ubi_change_vtbl_record(struct ubi_device *ubi, int idx, | |
104 | struct ubi_vtbl_record *vtbl_rec) | |
105 | { | |
2848594a | 106 | int err; |
801c135c AB |
107 | uint32_t crc; |
108 | ||
109 | ubi_assert(idx >= 0 && idx < ubi->vtbl_slots); | |
110 | ||
111 | if (!vtbl_rec) | |
112 | vtbl_rec = &empty_vtbl_record; | |
113 | else { | |
114 | crc = crc32(UBI_CRC32_INIT, vtbl_rec, UBI_VTBL_RECORD_SIZE_CRC); | |
3261ebd7 | 115 | vtbl_rec->crc = cpu_to_be32(crc); |
801c135c AB |
116 | } |
117 | ||
801c135c | 118 | memcpy(&ubi->vtbl[idx], vtbl_rec, sizeof(struct ubi_vtbl_record)); |
2848594a | 119 | err = ubi_update_layout_vol(ubi); |
801c135c | 120 | |
7bf523ae | 121 | self_vtbl_check(ubi); |
2848594a | 122 | return err ? err : 0; |
801c135c AB |
123 | } |
124 | ||
f40ac9cd AB |
125 | /** |
126 | * ubi_vtbl_rename_volumes - rename UBI volumes in the volume table. | |
127 | * @ubi: UBI device description object | |
ebaaf1af | 128 | * @rename_list: list of &struct ubi_rename_entry objects |
f40ac9cd AB |
129 | * |
130 | * This function re-names multiple volumes specified in @req in the volume | |
131 | * table. Returns zero in case of success and a negative error code in case of | |
132 | * failure. | |
133 | */ | |
134 | int ubi_vtbl_rename_volumes(struct ubi_device *ubi, | |
135 | struct list_head *rename_list) | |
136 | { | |
f40ac9cd | 137 | struct ubi_rename_entry *re; |
f40ac9cd AB |
138 | |
139 | list_for_each_entry(re, rename_list, list) { | |
140 | uint32_t crc; | |
141 | struct ubi_volume *vol = re->desc->vol; | |
142 | struct ubi_vtbl_record *vtbl_rec = &ubi->vtbl[vol->vol_id]; | |
143 | ||
144 | if (re->remove) { | |
145 | memcpy(vtbl_rec, &empty_vtbl_record, | |
146 | sizeof(struct ubi_vtbl_record)); | |
147 | continue; | |
148 | } | |
149 | ||
150 | vtbl_rec->name_len = cpu_to_be16(re->new_name_len); | |
151 | memcpy(vtbl_rec->name, re->new_name, re->new_name_len); | |
152 | memset(vtbl_rec->name + re->new_name_len, 0, | |
153 | UBI_VOL_NAME_MAX + 1 - re->new_name_len); | |
154 | crc = crc32(UBI_CRC32_INIT, vtbl_rec, | |
155 | UBI_VTBL_RECORD_SIZE_CRC); | |
156 | vtbl_rec->crc = cpu_to_be32(crc); | |
157 | } | |
158 | ||
2848594a | 159 | return ubi_update_layout_vol(ubi); |
f40ac9cd AB |
160 | } |
161 | ||
801c135c | 162 | /** |
ebaaf1af | 163 | * vtbl_check - check if volume table is not corrupted and sensible. |
801c135c AB |
164 | * @ubi: UBI device description object |
165 | * @vtbl: volume table | |
166 | * | |
167 | * This function returns zero if @vtbl is all right, %1 if CRC is incorrect, | |
168 | * and %-EINVAL if it contains inconsistent data. | |
169 | */ | |
170 | static int vtbl_check(const struct ubi_device *ubi, | |
171 | const struct ubi_vtbl_record *vtbl) | |
172 | { | |
173 | int i, n, reserved_pebs, alignment, data_pad, vol_type, name_len; | |
979c9296 | 174 | int upd_marker, err; |
801c135c AB |
175 | uint32_t crc; |
176 | const char *name; | |
177 | ||
178 | for (i = 0; i < ubi->vtbl_slots; i++) { | |
179 | cond_resched(); | |
180 | ||
3261ebd7 CH |
181 | reserved_pebs = be32_to_cpu(vtbl[i].reserved_pebs); |
182 | alignment = be32_to_cpu(vtbl[i].alignment); | |
183 | data_pad = be32_to_cpu(vtbl[i].data_pad); | |
801c135c AB |
184 | upd_marker = vtbl[i].upd_marker; |
185 | vol_type = vtbl[i].vol_type; | |
3261ebd7 | 186 | name_len = be16_to_cpu(vtbl[i].name_len); |
801c135c AB |
187 | name = &vtbl[i].name[0]; |
188 | ||
189 | crc = crc32(UBI_CRC32_INIT, &vtbl[i], UBI_VTBL_RECORD_SIZE_CRC); | |
3261ebd7 | 190 | if (be32_to_cpu(vtbl[i].crc) != crc) { |
32608703 | 191 | ubi_err(ubi, "bad CRC at record %u: %#08x, not %#08x", |
3261ebd7 | 192 | i, crc, be32_to_cpu(vtbl[i].crc)); |
1f021e1d | 193 | ubi_dump_vtbl_record(&vtbl[i], i); |
801c135c AB |
194 | return 1; |
195 | } | |
196 | ||
197 | if (reserved_pebs == 0) { | |
198 | if (memcmp(&vtbl[i], &empty_vtbl_record, | |
199 | UBI_VTBL_RECORD_SIZE)) { | |
979c9296 | 200 | err = 2; |
801c135c AB |
201 | goto bad; |
202 | } | |
203 | continue; | |
204 | } | |
205 | ||
206 | if (reserved_pebs < 0 || alignment < 0 || data_pad < 0 || | |
207 | name_len < 0) { | |
979c9296 | 208 | err = 3; |
801c135c AB |
209 | goto bad; |
210 | } | |
211 | ||
212 | if (alignment > ubi->leb_size || alignment == 0) { | |
979c9296 | 213 | err = 4; |
801c135c AB |
214 | goto bad; |
215 | } | |
216 | ||
cadb40cc | 217 | n = alignment & (ubi->min_io_size - 1); |
801c135c | 218 | if (alignment != 1 && n) { |
979c9296 | 219 | err = 5; |
801c135c AB |
220 | goto bad; |
221 | } | |
222 | ||
223 | n = ubi->leb_size % alignment; | |
224 | if (data_pad != n) { | |
32608703 | 225 | ubi_err(ubi, "bad data_pad, has to be %d", n); |
979c9296 | 226 | err = 6; |
801c135c AB |
227 | goto bad; |
228 | } | |
229 | ||
230 | if (vol_type != UBI_VID_DYNAMIC && vol_type != UBI_VID_STATIC) { | |
979c9296 | 231 | err = 7; |
801c135c AB |
232 | goto bad; |
233 | } | |
234 | ||
235 | if (upd_marker != 0 && upd_marker != 1) { | |
979c9296 | 236 | err = 8; |
801c135c AB |
237 | goto bad; |
238 | } | |
239 | ||
240 | if (reserved_pebs > ubi->good_peb_count) { | |
32608703 | 241 | ubi_err(ubi, "too large reserved_pebs %d, good PEBs %d", |
762a9f29 | 242 | reserved_pebs, ubi->good_peb_count); |
979c9296 | 243 | err = 9; |
801c135c AB |
244 | goto bad; |
245 | } | |
246 | ||
247 | if (name_len > UBI_VOL_NAME_MAX) { | |
979c9296 | 248 | err = 10; |
801c135c AB |
249 | goto bad; |
250 | } | |
251 | ||
252 | if (name[0] == '\0') { | |
979c9296 | 253 | err = 11; |
801c135c AB |
254 | goto bad; |
255 | } | |
256 | ||
257 | if (name_len != strnlen(name, name_len + 1)) { | |
979c9296 | 258 | err = 12; |
801c135c AB |
259 | goto bad; |
260 | } | |
261 | } | |
262 | ||
263 | /* Checks that all names are unique */ | |
264 | for (i = 0; i < ubi->vtbl_slots - 1; i++) { | |
265 | for (n = i + 1; n < ubi->vtbl_slots; n++) { | |
3261ebd7 CH |
266 | int len1 = be16_to_cpu(vtbl[i].name_len); |
267 | int len2 = be16_to_cpu(vtbl[n].name_len); | |
801c135c AB |
268 | |
269 | if (len1 > 0 && len1 == len2 && | |
270 | !strncmp(vtbl[i].name, vtbl[n].name, len1)) { | |
32608703 | 271 | ubi_err(ubi, "volumes %d and %d have the same name \"%s\"", |
049333ce | 272 | i, n, vtbl[i].name); |
1f021e1d AB |
273 | ubi_dump_vtbl_record(&vtbl[i], i); |
274 | ubi_dump_vtbl_record(&vtbl[n], n); | |
801c135c AB |
275 | return -EINVAL; |
276 | } | |
277 | } | |
278 | } | |
279 | ||
280 | return 0; | |
281 | ||
282 | bad: | |
32608703 | 283 | ubi_err(ubi, "volume table check failed: record %d, error %d", i, err); |
1f021e1d | 284 | ubi_dump_vtbl_record(&vtbl[i], i); |
801c135c AB |
285 | return -EINVAL; |
286 | } | |
287 | ||
288 | /** | |
289 | * create_vtbl - create a copy of volume table. | |
290 | * @ubi: UBI device description object | |
a4e6042f | 291 | * @ai: attaching information |
801c135c AB |
292 | * @copy: number of the volume table copy |
293 | * @vtbl: contents of the volume table | |
294 | * | |
295 | * This function returns zero in case of success and a negative error code in | |
296 | * case of failure. | |
297 | */ | |
a4e6042f | 298 | static int create_vtbl(struct ubi_device *ubi, struct ubi_attach_info *ai, |
801c135c AB |
299 | int copy, void *vtbl) |
300 | { | |
301 | int err, tries = 0; | |
6bdccffe | 302 | struct ubi_vid_hdr *vid_hdr; |
2c5ec5ce | 303 | struct ubi_ainf_peb *new_aeb; |
801c135c | 304 | |
719bb840 | 305 | dbg_gen("create volume table (copy #%d)", copy + 1); |
801c135c | 306 | |
33818bbb | 307 | vid_hdr = ubi_zalloc_vid_hdr(ubi, GFP_KERNEL); |
801c135c AB |
308 | if (!vid_hdr) |
309 | return -ENOMEM; | |
310 | ||
801c135c | 311 | retry: |
c87fbd7d | 312 | new_aeb = ubi_early_get_peb(ubi, ai); |
2c5ec5ce AB |
313 | if (IS_ERR(new_aeb)) { |
314 | err = PTR_ERR(new_aeb); | |
801c135c AB |
315 | goto out_free; |
316 | } | |
317 | ||
1f4f4347 | 318 | vid_hdr->vol_type = UBI_LAYOUT_VOLUME_TYPE; |
91f2d53c | 319 | vid_hdr->vol_id = cpu_to_be32(UBI_LAYOUT_VOLUME_ID); |
801c135c AB |
320 | vid_hdr->compat = UBI_LAYOUT_VOLUME_COMPAT; |
321 | vid_hdr->data_size = vid_hdr->used_ebs = | |
3261ebd7 CH |
322 | vid_hdr->data_pad = cpu_to_be32(0); |
323 | vid_hdr->lnum = cpu_to_be32(copy); | |
a4e6042f | 324 | vid_hdr->sqnum = cpu_to_be64(++ai->max_sqnum); |
801c135c AB |
325 | |
326 | /* The EC header is already there, write the VID header */ | |
2c5ec5ce | 327 | err = ubi_io_write_vid_hdr(ubi, new_aeb->pnum, vid_hdr); |
801c135c AB |
328 | if (err) |
329 | goto write_error; | |
330 | ||
331 | /* Write the layout volume contents */ | |
2c5ec5ce | 332 | err = ubi_io_write_data(ubi, vtbl, new_aeb->pnum, 0, ubi->vtbl_size); |
801c135c AB |
333 | if (err) |
334 | goto write_error; | |
335 | ||
336 | /* | |
a4e6042f | 337 | * And add it to the attaching information. Don't delete the old version |
3561188a | 338 | * of this LEB as it will be deleted and freed in 'ubi_add_to_av()'. |
801c135c | 339 | */ |
3561188a | 340 | err = ubi_add_to_av(ubi, ai, new_aeb->pnum, new_aeb->ec, vid_hdr, 0); |
78b495c3 | 341 | kmem_cache_free(ai->aeb_slab_cache, new_aeb); |
801c135c AB |
342 | ubi_free_vid_hdr(ubi, vid_hdr); |
343 | return err; | |
344 | ||
345 | write_error: | |
78d87c95 AB |
346 | if (err == -EIO && ++tries <= 5) { |
347 | /* | |
348 | * Probably this physical eraseblock went bad, try to pick | |
349 | * another one. | |
350 | */ | |
a4e6042f | 351 | list_add(&new_aeb->u.list, &ai->erase); |
c4e90ec0 | 352 | goto retry; |
78d87c95 | 353 | } |
78b495c3 | 354 | kmem_cache_free(ai->aeb_slab_cache, new_aeb); |
801c135c AB |
355 | out_free: |
356 | ubi_free_vid_hdr(ubi, vid_hdr); | |
357 | return err; | |
358 | ||
359 | } | |
360 | ||
361 | /** | |
362 | * process_lvol - process the layout volume. | |
363 | * @ubi: UBI device description object | |
a4e6042f | 364 | * @ai: attaching information |
517af48c | 365 | * @av: layout volume attaching information |
801c135c AB |
366 | * |
367 | * This function is responsible for reading the layout volume, ensuring it is | |
368 | * not corrupted, and recovering from corruptions if needed. Returns volume | |
369 | * table in case of success and a negative error code in case of failure. | |
370 | */ | |
e88d6e10 | 371 | static struct ubi_vtbl_record *process_lvol(struct ubi_device *ubi, |
a4e6042f | 372 | struct ubi_attach_info *ai, |
517af48c | 373 | struct ubi_ainf_volume *av) |
801c135c AB |
374 | { |
375 | int err; | |
376 | struct rb_node *rb; | |
2c5ec5ce | 377 | struct ubi_ainf_peb *aeb; |
801c135c AB |
378 | struct ubi_vtbl_record *leb[UBI_LAYOUT_VOLUME_EBS] = { NULL, NULL }; |
379 | int leb_corrupted[UBI_LAYOUT_VOLUME_EBS] = {1, 1}; | |
380 | ||
381 | /* | |
382 | * UBI goes through the following steps when it changes the layout | |
383 | * volume: | |
384 | * a. erase LEB 0; | |
385 | * b. write new data to LEB 0; | |
386 | * c. erase LEB 1; | |
387 | * d. write new data to LEB 1. | |
388 | * | |
389 | * Before the change, both LEBs contain the same data. | |
390 | * | |
391 | * Due to unclean reboots, the contents of LEB 0 may be lost, but there | |
392 | * should LEB 1. So it is OK if LEB 0 is corrupted while LEB 1 is not. | |
393 | * Similarly, LEB 1 may be lost, but there should be LEB 0. And | |
394 | * finally, unclean reboots may result in a situation when neither LEB | |
395 | * 0 nor LEB 1 are corrupted, but they are different. In this case, LEB | |
396 | * 0 contains more recent information. | |
397 | * | |
398 | * So the plan is to first check LEB 0. Then | |
be436f62 | 399 | * a. if LEB 0 is OK, it must be containing the most recent data; then |
801c135c AB |
400 | * we compare it with LEB 1, and if they are different, we copy LEB |
401 | * 0 to LEB 1; | |
402 | * b. if LEB 0 is corrupted, but LEB 1 has to be OK, and we copy LEB 1 | |
403 | * to LEB 0. | |
404 | */ | |
405 | ||
c8566350 | 406 | dbg_gen("check layout volume"); |
801c135c AB |
407 | |
408 | /* Read both LEB 0 and LEB 1 into memory */ | |
517af48c | 409 | ubi_rb_for_each_entry(rb, aeb, &av->root, u.rb) { |
2c5ec5ce AB |
410 | leb[aeb->lnum] = vzalloc(ubi->vtbl_size); |
411 | if (!leb[aeb->lnum]) { | |
801c135c AB |
412 | err = -ENOMEM; |
413 | goto out_free; | |
414 | } | |
415 | ||
2c5ec5ce | 416 | err = ubi_io_read_data(ubi, leb[aeb->lnum], aeb->pnum, 0, |
801c135c | 417 | ubi->vtbl_size); |
d57f4054 | 418 | if (err == UBI_IO_BITFLIPS || mtd_is_eccerr(err)) |
beeea636 AB |
419 | /* |
420 | * Scrub the PEB later. Note, -EBADMSG indicates an | |
421 | * uncorrectable ECC error, but we have our own CRC and | |
422 | * the data will be checked later. If the data is OK, | |
423 | * the PEB will be scrubbed (because we set | |
2c5ec5ce | 424 | * aeb->scrub). If the data is not OK, the contents of |
beeea636 | 425 | * the PEB will be recovered from the second copy, and |
2c5ec5ce | 426 | * aeb->scrub will be cleared in |
3561188a | 427 | * 'ubi_add_to_av()'. |
beeea636 | 428 | */ |
2c5ec5ce | 429 | aeb->scrub = 1; |
801c135c AB |
430 | else if (err) |
431 | goto out_free; | |
432 | } | |
433 | ||
434 | err = -EINVAL; | |
435 | if (leb[0]) { | |
436 | leb_corrupted[0] = vtbl_check(ubi, leb[0]); | |
437 | if (leb_corrupted[0] < 0) | |
438 | goto out_free; | |
439 | } | |
440 | ||
441 | if (!leb_corrupted[0]) { | |
442 | /* LEB 0 is OK */ | |
443 | if (leb[1]) | |
9c9ec147 AB |
444 | leb_corrupted[1] = memcmp(leb[0], leb[1], |
445 | ubi->vtbl_size); | |
801c135c | 446 | if (leb_corrupted[1]) { |
32608703 | 447 | ubi_warn(ubi, "volume table copy #2 is corrupted"); |
a4e6042f | 448 | err = create_vtbl(ubi, ai, 1, leb[0]); |
801c135c AB |
449 | if (err) |
450 | goto out_free; | |
32608703 | 451 | ubi_msg(ubi, "volume table was restored"); |
801c135c AB |
452 | } |
453 | ||
454 | /* Both LEB 1 and LEB 2 are OK and consistent */ | |
92ad8f37 | 455 | vfree(leb[1]); |
801c135c AB |
456 | return leb[0]; |
457 | } else { | |
458 | /* LEB 0 is corrupted or does not exist */ | |
459 | if (leb[1]) { | |
460 | leb_corrupted[1] = vtbl_check(ubi, leb[1]); | |
461 | if (leb_corrupted[1] < 0) | |
462 | goto out_free; | |
463 | } | |
464 | if (leb_corrupted[1]) { | |
465 | /* Both LEB 0 and LEB 1 are corrupted */ | |
32608703 | 466 | ubi_err(ubi, "both volume tables are corrupted"); |
801c135c AB |
467 | goto out_free; |
468 | } | |
469 | ||
32608703 | 470 | ubi_warn(ubi, "volume table copy #1 is corrupted"); |
a4e6042f | 471 | err = create_vtbl(ubi, ai, 0, leb[1]); |
801c135c AB |
472 | if (err) |
473 | goto out_free; | |
32608703 | 474 | ubi_msg(ubi, "volume table was restored"); |
801c135c | 475 | |
92ad8f37 | 476 | vfree(leb[0]); |
801c135c AB |
477 | return leb[1]; |
478 | } | |
479 | ||
480 | out_free: | |
92ad8f37 AB |
481 | vfree(leb[0]); |
482 | vfree(leb[1]); | |
801c135c AB |
483 | return ERR_PTR(err); |
484 | } | |
485 | ||
486 | /** | |
487 | * create_empty_lvol - create empty layout volume. | |
488 | * @ubi: UBI device description object | |
a4e6042f | 489 | * @ai: attaching information |
801c135c AB |
490 | * |
491 | * This function returns volume table contents in case of success and a | |
492 | * negative error code in case of failure. | |
493 | */ | |
e88d6e10 | 494 | static struct ubi_vtbl_record *create_empty_lvol(struct ubi_device *ubi, |
a4e6042f | 495 | struct ubi_attach_info *ai) |
801c135c AB |
496 | { |
497 | int i; | |
498 | struct ubi_vtbl_record *vtbl; | |
499 | ||
309b5e4e | 500 | vtbl = vzalloc(ubi->vtbl_size); |
801c135c AB |
501 | if (!vtbl) |
502 | return ERR_PTR(-ENOMEM); | |
503 | ||
504 | for (i = 0; i < ubi->vtbl_slots; i++) | |
505 | memcpy(&vtbl[i], &empty_vtbl_record, UBI_VTBL_RECORD_SIZE); | |
506 | ||
507 | for (i = 0; i < UBI_LAYOUT_VOLUME_EBS; i++) { | |
508 | int err; | |
509 | ||
a4e6042f | 510 | err = create_vtbl(ubi, ai, i, vtbl); |
801c135c | 511 | if (err) { |
92ad8f37 | 512 | vfree(vtbl); |
801c135c AB |
513 | return ERR_PTR(err); |
514 | } | |
515 | } | |
516 | ||
517 | return vtbl; | |
518 | } | |
519 | ||
520 | /** | |
521 | * init_volumes - initialize volume information for existing volumes. | |
522 | * @ubi: UBI device description object | |
a4e6042f | 523 | * @ai: scanning information |
801c135c AB |
524 | * @vtbl: volume table |
525 | * | |
526 | * This function allocates volume description objects for existing volumes. | |
527 | * Returns zero in case of success and a negative error code in case of | |
528 | * failure. | |
529 | */ | |
afc15a81 | 530 | static int init_volumes(struct ubi_device *ubi, |
a4e6042f | 531 | const struct ubi_attach_info *ai, |
801c135c AB |
532 | const struct ubi_vtbl_record *vtbl) |
533 | { | |
534 | int i, reserved_pebs = 0; | |
517af48c | 535 | struct ubi_ainf_volume *av; |
801c135c AB |
536 | struct ubi_volume *vol; |
537 | ||
538 | for (i = 0; i < ubi->vtbl_slots; i++) { | |
539 | cond_resched(); | |
540 | ||
3261ebd7 | 541 | if (be32_to_cpu(vtbl[i].reserved_pebs) == 0) |
801c135c AB |
542 | continue; /* Empty record */ |
543 | ||
544 | vol = kzalloc(sizeof(struct ubi_volume), GFP_KERNEL); | |
545 | if (!vol) | |
546 | return -ENOMEM; | |
547 | ||
3261ebd7 CH |
548 | vol->reserved_pebs = be32_to_cpu(vtbl[i].reserved_pebs); |
549 | vol->alignment = be32_to_cpu(vtbl[i].alignment); | |
550 | vol->data_pad = be32_to_cpu(vtbl[i].data_pad); | |
ff998793 | 551 | vol->upd_marker = vtbl[i].upd_marker; |
801c135c AB |
552 | vol->vol_type = vtbl[i].vol_type == UBI_VID_DYNAMIC ? |
553 | UBI_DYNAMIC_VOLUME : UBI_STATIC_VOLUME; | |
3261ebd7 | 554 | vol->name_len = be16_to_cpu(vtbl[i].name_len); |
801c135c AB |
555 | vol->usable_leb_size = ubi->leb_size - vol->data_pad; |
556 | memcpy(vol->name, vtbl[i].name, vol->name_len); | |
557 | vol->name[vol->name_len] = '\0'; | |
558 | vol->vol_id = i; | |
559 | ||
4ccf8cff AB |
560 | if (vtbl[i].flags & UBI_VTBL_AUTORESIZE_FLG) { |
561 | /* Auto re-size flag may be set only for one volume */ | |
562 | if (ubi->autoresize_vol_id != -1) { | |
32608703 | 563 | ubi_err(ubi, "more than one auto-resize volume (%d and %d)", |
049333ce | 564 | ubi->autoresize_vol_id, i); |
f7f02837 | 565 | kfree(vol); |
4ccf8cff AB |
566 | return -EINVAL; |
567 | } | |
568 | ||
569 | ubi->autoresize_vol_id = i; | |
570 | } | |
571 | ||
801c135c AB |
572 | ubi_assert(!ubi->volumes[i]); |
573 | ubi->volumes[i] = vol; | |
574 | ubi->vol_count += 1; | |
575 | vol->ubi = ubi; | |
576 | reserved_pebs += vol->reserved_pebs; | |
577 | ||
578 | /* | |
579 | * In case of dynamic volume UBI knows nothing about how many | |
580 | * data is stored there. So assume the whole volume is used. | |
581 | */ | |
582 | if (vol->vol_type == UBI_DYNAMIC_VOLUME) { | |
583 | vol->used_ebs = vol->reserved_pebs; | |
584 | vol->last_eb_bytes = vol->usable_leb_size; | |
d08c3b78 VA |
585 | vol->used_bytes = |
586 | (long long)vol->used_ebs * vol->usable_leb_size; | |
801c135c AB |
587 | continue; |
588 | } | |
589 | ||
590 | /* Static volumes only */ | |
dcd85fdd | 591 | av = ubi_find_av(ai, i); |
e8c235b0 | 592 | if (!av || !av->leb_count) { |
801c135c AB |
593 | /* |
594 | * No eraseblocks belonging to this volume found. We | |
595 | * don't actually know whether this static volume is | |
596 | * completely corrupted or just contains no data. And | |
597 | * we cannot know this as long as data size is not | |
598 | * stored on flash. So we just assume the volume is | |
599 | * empty. FIXME: this should be handled. | |
600 | */ | |
601 | continue; | |
602 | } | |
603 | ||
517af48c | 604 | if (av->leb_count != av->used_ebs) { |
801c135c AB |
605 | /* |
606 | * We found a static volume which misses several | |
607 | * eraseblocks. Treat it as corrupted. | |
608 | */ | |
32608703 | 609 | ubi_warn(ubi, "static volume %d misses %d LEBs - corrupted", |
517af48c | 610 | av->vol_id, av->used_ebs - av->leb_count); |
801c135c AB |
611 | vol->corrupted = 1; |
612 | continue; | |
613 | } | |
614 | ||
517af48c | 615 | vol->used_ebs = av->used_ebs; |
d08c3b78 VA |
616 | vol->used_bytes = |
617 | (long long)(vol->used_ebs - 1) * vol->usable_leb_size; | |
517af48c AB |
618 | vol->used_bytes += av->last_data_size; |
619 | vol->last_eb_bytes = av->last_data_size; | |
801c135c AB |
620 | } |
621 | ||
d05c77a8 | 622 | /* And add the layout volume */ |
801c135c AB |
623 | vol = kzalloc(sizeof(struct ubi_volume), GFP_KERNEL); |
624 | if (!vol) | |
625 | return -ENOMEM; | |
626 | ||
627 | vol->reserved_pebs = UBI_LAYOUT_VOLUME_EBS; | |
1f4f4347 | 628 | vol->alignment = UBI_LAYOUT_VOLUME_ALIGN; |
801c135c AB |
629 | vol->vol_type = UBI_DYNAMIC_VOLUME; |
630 | vol->name_len = sizeof(UBI_LAYOUT_VOLUME_NAME) - 1; | |
631 | memcpy(vol->name, UBI_LAYOUT_VOLUME_NAME, vol->name_len + 1); | |
632 | vol->usable_leb_size = ubi->leb_size; | |
633 | vol->used_ebs = vol->reserved_pebs; | |
634 | vol->last_eb_bytes = vol->reserved_pebs; | |
d08c3b78 VA |
635 | vol->used_bytes = |
636 | (long long)vol->used_ebs * (ubi->leb_size - vol->data_pad); | |
91f2d53c | 637 | vol->vol_id = UBI_LAYOUT_VOLUME_ID; |
d05c77a8 | 638 | vol->ref_count = 1; |
801c135c AB |
639 | |
640 | ubi_assert(!ubi->volumes[i]); | |
641 | ubi->volumes[vol_id2idx(ubi, vol->vol_id)] = vol; | |
642 | reserved_pebs += vol->reserved_pebs; | |
643 | ubi->vol_count += 1; | |
644 | vol->ubi = ubi; | |
645 | ||
5fc01ab6 | 646 | if (reserved_pebs > ubi->avail_pebs) { |
32608703 | 647 | ubi_err(ubi, "not enough PEBs, required %d, available %d", |
801c135c | 648 | reserved_pebs, ubi->avail_pebs); |
5fc01ab6 | 649 | if (ubi->corr_peb_count) |
32608703 | 650 | ubi_err(ubi, "%d PEBs are corrupted and not used", |
5fc01ab6 | 651 | ubi->corr_peb_count); |
7c7feb2e | 652 | return -ENOSPC; |
5fc01ab6 | 653 | } |
801c135c AB |
654 | ubi->rsvd_pebs += reserved_pebs; |
655 | ubi->avail_pebs -= reserved_pebs; | |
656 | ||
657 | return 0; | |
658 | } | |
659 | ||
660 | /** | |
517af48c | 661 | * check_av - check volume attaching information. |
801c135c | 662 | * @vol: UBI volume description object |
517af48c | 663 | * @av: volume attaching information |
801c135c | 664 | * |
a4e6042f | 665 | * This function returns zero if the volume attaching information is consistent |
801c135c AB |
666 | * to the data read from the volume tabla, and %-EINVAL if not. |
667 | */ | |
45fc5c81 | 668 | static int check_av(const struct ubi_volume *vol, |
517af48c | 669 | const struct ubi_ainf_volume *av) |
801c135c | 670 | { |
979c9296 AB |
671 | int err; |
672 | ||
517af48c | 673 | if (av->highest_lnum >= vol->reserved_pebs) { |
979c9296 | 674 | err = 1; |
801c135c AB |
675 | goto bad; |
676 | } | |
517af48c | 677 | if (av->leb_count > vol->reserved_pebs) { |
979c9296 | 678 | err = 2; |
801c135c AB |
679 | goto bad; |
680 | } | |
517af48c | 681 | if (av->vol_type != vol->vol_type) { |
979c9296 | 682 | err = 3; |
801c135c AB |
683 | goto bad; |
684 | } | |
517af48c | 685 | if (av->used_ebs > vol->reserved_pebs) { |
979c9296 | 686 | err = 4; |
801c135c AB |
687 | goto bad; |
688 | } | |
517af48c | 689 | if (av->data_pad != vol->data_pad) { |
979c9296 | 690 | err = 5; |
801c135c AB |
691 | goto bad; |
692 | } | |
693 | return 0; | |
694 | ||
695 | bad: | |
45fc5c81 | 696 | ubi_err(vol->ubi, "bad attaching information, error %d", err); |
517af48c | 697 | ubi_dump_av(av); |
766381f0 | 698 | ubi_dump_vol_info(vol); |
801c135c AB |
699 | return -EINVAL; |
700 | } | |
701 | ||
702 | /** | |
fbd0107f | 703 | * check_attaching_info - check that attaching information. |
801c135c | 704 | * @ubi: UBI device description object |
a4e6042f | 705 | * @ai: attaching information |
801c135c AB |
706 | * |
707 | * Even though we protect on-flash data by CRC checksums, we still don't trust | |
a4e6042f | 708 | * the media. This function ensures that attaching information is consistent to |
fbd0107f | 709 | * the information read from the volume table. Returns zero if the attaching |
801c135c AB |
710 | * information is OK and %-EINVAL if it is not. |
711 | */ | |
fbd0107f | 712 | static int check_attaching_info(const struct ubi_device *ubi, |
a4e6042f | 713 | struct ubi_attach_info *ai) |
801c135c AB |
714 | { |
715 | int err, i; | |
517af48c | 716 | struct ubi_ainf_volume *av; |
801c135c AB |
717 | struct ubi_volume *vol; |
718 | ||
a4e6042f | 719 | if (ai->vols_found > UBI_INT_VOL_COUNT + ubi->vtbl_slots) { |
32608703 | 720 | ubi_err(ubi, "found %d volumes while attaching, maximum is %d + %d", |
a4e6042f | 721 | ai->vols_found, UBI_INT_VOL_COUNT, ubi->vtbl_slots); |
801c135c AB |
722 | return -EINVAL; |
723 | } | |
724 | ||
a4e6042f AB |
725 | if (ai->highest_vol_id >= ubi->vtbl_slots + UBI_INT_VOL_COUNT && |
726 | ai->highest_vol_id < UBI_INTERNAL_VOL_START) { | |
32608703 TB |
727 | ubi_err(ubi, "too large volume ID %d found", |
728 | ai->highest_vol_id); | |
801c135c AB |
729 | return -EINVAL; |
730 | } | |
731 | ||
801c135c AB |
732 | for (i = 0; i < ubi->vtbl_slots + UBI_INT_VOL_COUNT; i++) { |
733 | cond_resched(); | |
734 | ||
dcd85fdd | 735 | av = ubi_find_av(ai, i); |
801c135c AB |
736 | vol = ubi->volumes[i]; |
737 | if (!vol) { | |
517af48c | 738 | if (av) |
d717dc2f | 739 | ubi_remove_av(ai, av); |
801c135c AB |
740 | continue; |
741 | } | |
742 | ||
743 | if (vol->reserved_pebs == 0) { | |
744 | ubi_assert(i < ubi->vtbl_slots); | |
745 | ||
517af48c | 746 | if (!av) |
801c135c AB |
747 | continue; |
748 | ||
749 | /* | |
fbd0107f | 750 | * During attaching we found a volume which does not |
801c135c AB |
751 | * exist according to the information in the volume |
752 | * table. This must have happened due to an unclean | |
753 | * reboot while the volume was being removed. Discard | |
754 | * these eraseblocks. | |
755 | */ | |
32608703 | 756 | ubi_msg(ubi, "finish volume %d removal", av->vol_id); |
d717dc2f | 757 | ubi_remove_av(ai, av); |
517af48c | 758 | } else if (av) { |
45fc5c81 | 759 | err = check_av(vol, av); |
801c135c AB |
760 | if (err) |
761 | return err; | |
762 | } | |
763 | } | |
764 | ||
765 | return 0; | |
766 | } | |
767 | ||
768 | /** | |
ebaaf1af | 769 | * ubi_read_volume_table - read the volume table. |
801c135c | 770 | * @ubi: UBI device description object |
a4e6042f | 771 | * @ai: attaching information |
801c135c AB |
772 | * |
773 | * This function reads volume table, checks it, recover from errors if needed, | |
774 | * or creates it if needed. Returns zero in case of success and a negative | |
775 | * error code in case of failure. | |
776 | */ | |
a4e6042f | 777 | int ubi_read_volume_table(struct ubi_device *ubi, struct ubi_attach_info *ai) |
801c135c AB |
778 | { |
779 | int i, err; | |
517af48c | 780 | struct ubi_ainf_volume *av; |
801c135c | 781 | |
3261ebd7 | 782 | empty_vtbl_record.crc = cpu_to_be32(0xf116c36b); |
801c135c AB |
783 | |
784 | /* | |
785 | * The number of supported volumes is limited by the eraseblock size | |
786 | * and by the UBI_MAX_VOLUMES constant. | |
787 | */ | |
788 | ubi->vtbl_slots = ubi->leb_size / UBI_VTBL_RECORD_SIZE; | |
789 | if (ubi->vtbl_slots > UBI_MAX_VOLUMES) | |
790 | ubi->vtbl_slots = UBI_MAX_VOLUMES; | |
791 | ||
792 | ubi->vtbl_size = ubi->vtbl_slots * UBI_VTBL_RECORD_SIZE; | |
793 | ubi->vtbl_size = ALIGN(ubi->vtbl_size, ubi->min_io_size); | |
794 | ||
dcd85fdd | 795 | av = ubi_find_av(ai, UBI_LAYOUT_VOLUME_ID); |
517af48c | 796 | if (!av) { |
801c135c AB |
797 | /* |
798 | * No logical eraseblocks belonging to the layout volume were | |
799 | * found. This could mean that the flash is just empty. In | |
800 | * this case we create empty layout volume. | |
801 | * | |
802 | * But if flash is not empty this must be a corruption or the | |
803 | * MTD device just contains garbage. | |
804 | */ | |
a4e6042f AB |
805 | if (ai->is_empty) { |
806 | ubi->vtbl = create_empty_lvol(ubi, ai); | |
801c135c AB |
807 | if (IS_ERR(ubi->vtbl)) |
808 | return PTR_ERR(ubi->vtbl); | |
809 | } else { | |
32608703 | 810 | ubi_err(ubi, "the layout volume was not found"); |
801c135c AB |
811 | return -EINVAL; |
812 | } | |
813 | } else { | |
517af48c | 814 | if (av->leb_count > UBI_LAYOUT_VOLUME_EBS) { |
801c135c | 815 | /* This must not happen with proper UBI images */ |
32608703 | 816 | ubi_err(ubi, "too many LEBs (%d) in layout volume", |
517af48c | 817 | av->leb_count); |
801c135c AB |
818 | return -EINVAL; |
819 | } | |
820 | ||
517af48c | 821 | ubi->vtbl = process_lvol(ubi, ai, av); |
801c135c AB |
822 | if (IS_ERR(ubi->vtbl)) |
823 | return PTR_ERR(ubi->vtbl); | |
824 | } | |
825 | ||
5fc01ab6 | 826 | ubi->avail_pebs = ubi->good_peb_count - ubi->corr_peb_count; |
801c135c AB |
827 | |
828 | /* | |
829 | * The layout volume is OK, initialize the corresponding in-RAM data | |
830 | * structures. | |
831 | */ | |
a4e6042f | 832 | err = init_volumes(ubi, ai, ubi->vtbl); |
801c135c AB |
833 | if (err) |
834 | goto out_free; | |
835 | ||
836 | /* | |
a4e6042f | 837 | * Make sure that the attaching information is consistent to the |
801c135c AB |
838 | * information stored in the volume table. |
839 | */ | |
fbd0107f | 840 | err = check_attaching_info(ubi, ai); |
801c135c AB |
841 | if (err) |
842 | goto out_free; | |
843 | ||
844 | return 0; | |
845 | ||
846 | out_free: | |
92ad8f37 | 847 | vfree(ubi->vtbl); |
9c9ec147 AB |
848 | for (i = 0; i < ubi->vtbl_slots + UBI_INT_VOL_COUNT; i++) { |
849 | kfree(ubi->volumes[i]); | |
850 | ubi->volumes[i] = NULL; | |
851 | } | |
801c135c AB |
852 | return err; |
853 | } | |
854 | ||
801c135c | 855 | /** |
7bf523ae | 856 | * self_vtbl_check - check volume table. |
801c135c AB |
857 | * @ubi: UBI device description object |
858 | */ | |
7bf523ae | 859 | static void self_vtbl_check(const struct ubi_device *ubi) |
801c135c | 860 | { |
64575574 | 861 | if (!ubi_dbg_chk_gen(ubi)) |
92d124f5 AB |
862 | return; |
863 | ||
801c135c | 864 | if (vtbl_check(ubi, ubi->vtbl)) { |
32608703 | 865 | ubi_err(ubi, "self-check failed"); |
801c135c AB |
866 | BUG(); |
867 | } | |
868 | } |