Commit | Line | Data |
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801c135c AB |
1 | /* |
2 | * Copyright (c) International Business Machines Corp., 2006 | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License as published by | |
6 | * the Free Software Foundation; either version 2 of the License, or | |
7 | * (at your option) any later version. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See | |
12 | * the GNU General Public License for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License | |
15 | * along with this program; if not, write to the Free Software | |
16 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
17 | * | |
18 | * Author: Artem Bityutskiy (Битюцкий Артём) | |
19 | */ | |
20 | ||
21 | /* | |
85c6e6e2 | 22 | * The UBI Eraseblock Association (EBA) sub-system. |
801c135c | 23 | * |
85c6e6e2 | 24 | * This sub-system is responsible for I/O to/from logical eraseblock. |
801c135c AB |
25 | * |
26 | * Although in this implementation the EBA table is fully kept and managed in | |
27 | * RAM, which assumes poor scalability, it might be (partially) maintained on | |
28 | * flash in future implementations. | |
29 | * | |
85c6e6e2 AB |
30 | * The EBA sub-system implements per-logical eraseblock locking. Before |
31 | * accessing a logical eraseblock it is locked for reading or writing. The | |
32 | * per-logical eraseblock locking is implemented by means of the lock tree. The | |
33 | * lock tree is an RB-tree which refers all the currently locked logical | |
34 | * eraseblocks. The lock tree elements are &struct ubi_ltree_entry objects. | |
35 | * They are indexed by (@vol_id, @lnum) pairs. | |
801c135c AB |
36 | * |
37 | * EBA also maintains the global sequence counter which is incremented each | |
38 | * time a logical eraseblock is mapped to a physical eraseblock and it is | |
39 | * stored in the volume identifier header. This means that each VID header has | |
40 | * a unique sequence number. The sequence number is only increased an we assume | |
41 | * 64 bits is enough to never overflow. | |
42 | */ | |
43 | ||
44 | #include <linux/slab.h> | |
45 | #include <linux/crc32.h> | |
46 | #include <linux/err.h> | |
47 | #include "ubi.h" | |
48 | ||
e8823bd6 AB |
49 | /* Number of physical eraseblocks reserved for atomic LEB change operation */ |
50 | #define EBA_RESERVED_PEBS 1 | |
51 | ||
801c135c AB |
52 | /** |
53 | * next_sqnum - get next sequence number. | |
54 | * @ubi: UBI device description object | |
55 | * | |
56 | * This function returns next sequence number to use, which is just the current | |
57 | * global sequence counter value. It also increases the global sequence | |
58 | * counter. | |
59 | */ | |
a7306653 | 60 | unsigned long long ubi_next_sqnum(struct ubi_device *ubi) |
801c135c AB |
61 | { |
62 | unsigned long long sqnum; | |
63 | ||
64 | spin_lock(&ubi->ltree_lock); | |
65 | sqnum = ubi->global_sqnum++; | |
66 | spin_unlock(&ubi->ltree_lock); | |
67 | ||
68 | return sqnum; | |
69 | } | |
70 | ||
71 | /** | |
72 | * ubi_get_compat - get compatibility flags of a volume. | |
73 | * @ubi: UBI device description object | |
74 | * @vol_id: volume ID | |
75 | * | |
76 | * This function returns compatibility flags for an internal volume. User | |
77 | * volumes have no compatibility flags, so %0 is returned. | |
78 | */ | |
79 | static int ubi_get_compat(const struct ubi_device *ubi, int vol_id) | |
80 | { | |
91f2d53c | 81 | if (vol_id == UBI_LAYOUT_VOLUME_ID) |
801c135c AB |
82 | return UBI_LAYOUT_VOLUME_COMPAT; |
83 | return 0; | |
84 | } | |
85 | ||
86 | /** | |
87 | * ltree_lookup - look up the lock tree. | |
88 | * @ubi: UBI device description object | |
89 | * @vol_id: volume ID | |
90 | * @lnum: logical eraseblock number | |
91 | * | |
3a8d4642 | 92 | * This function returns a pointer to the corresponding &struct ubi_ltree_entry |
801c135c AB |
93 | * object if the logical eraseblock is locked and %NULL if it is not. |
94 | * @ubi->ltree_lock has to be locked. | |
95 | */ | |
3a8d4642 AB |
96 | static struct ubi_ltree_entry *ltree_lookup(struct ubi_device *ubi, int vol_id, |
97 | int lnum) | |
801c135c AB |
98 | { |
99 | struct rb_node *p; | |
100 | ||
101 | p = ubi->ltree.rb_node; | |
102 | while (p) { | |
3a8d4642 | 103 | struct ubi_ltree_entry *le; |
801c135c | 104 | |
3a8d4642 | 105 | le = rb_entry(p, struct ubi_ltree_entry, rb); |
801c135c AB |
106 | |
107 | if (vol_id < le->vol_id) | |
108 | p = p->rb_left; | |
109 | else if (vol_id > le->vol_id) | |
110 | p = p->rb_right; | |
111 | else { | |
112 | if (lnum < le->lnum) | |
113 | p = p->rb_left; | |
114 | else if (lnum > le->lnum) | |
115 | p = p->rb_right; | |
116 | else | |
117 | return le; | |
118 | } | |
119 | } | |
120 | ||
121 | return NULL; | |
122 | } | |
123 | ||
124 | /** | |
125 | * ltree_add_entry - add new entry to the lock tree. | |
126 | * @ubi: UBI device description object | |
127 | * @vol_id: volume ID | |
128 | * @lnum: logical eraseblock number | |
129 | * | |
130 | * This function adds new entry for logical eraseblock (@vol_id, @lnum) to the | |
131 | * lock tree. If such entry is already there, its usage counter is increased. | |
132 | * Returns pointer to the lock tree entry or %-ENOMEM if memory allocation | |
133 | * failed. | |
134 | */ | |
3a8d4642 AB |
135 | static struct ubi_ltree_entry *ltree_add_entry(struct ubi_device *ubi, |
136 | int vol_id, int lnum) | |
801c135c | 137 | { |
3a8d4642 | 138 | struct ubi_ltree_entry *le, *le1, *le_free; |
801c135c | 139 | |
b9a06623 | 140 | le = kmalloc(sizeof(struct ubi_ltree_entry), GFP_NOFS); |
801c135c AB |
141 | if (!le) |
142 | return ERR_PTR(-ENOMEM); | |
143 | ||
b9a06623 AB |
144 | le->users = 0; |
145 | init_rwsem(&le->mutex); | |
801c135c AB |
146 | le->vol_id = vol_id; |
147 | le->lnum = lnum; | |
148 | ||
149 | spin_lock(&ubi->ltree_lock); | |
150 | le1 = ltree_lookup(ubi, vol_id, lnum); | |
151 | ||
152 | if (le1) { | |
153 | /* | |
154 | * This logical eraseblock is already locked. The newly | |
155 | * allocated lock entry is not needed. | |
156 | */ | |
157 | le_free = le; | |
158 | le = le1; | |
159 | } else { | |
160 | struct rb_node **p, *parent = NULL; | |
161 | ||
162 | /* | |
163 | * No lock entry, add the newly allocated one to the | |
164 | * @ubi->ltree RB-tree. | |
165 | */ | |
166 | le_free = NULL; | |
167 | ||
168 | p = &ubi->ltree.rb_node; | |
169 | while (*p) { | |
170 | parent = *p; | |
3a8d4642 | 171 | le1 = rb_entry(parent, struct ubi_ltree_entry, rb); |
801c135c AB |
172 | |
173 | if (vol_id < le1->vol_id) | |
174 | p = &(*p)->rb_left; | |
175 | else if (vol_id > le1->vol_id) | |
176 | p = &(*p)->rb_right; | |
177 | else { | |
178 | ubi_assert(lnum != le1->lnum); | |
179 | if (lnum < le1->lnum) | |
180 | p = &(*p)->rb_left; | |
181 | else | |
182 | p = &(*p)->rb_right; | |
183 | } | |
184 | } | |
185 | ||
186 | rb_link_node(&le->rb, parent, p); | |
187 | rb_insert_color(&le->rb, &ubi->ltree); | |
188 | } | |
189 | le->users += 1; | |
190 | spin_unlock(&ubi->ltree_lock); | |
191 | ||
9c9ec147 | 192 | kfree(le_free); |
801c135c AB |
193 | return le; |
194 | } | |
195 | ||
196 | /** | |
197 | * leb_read_lock - lock logical eraseblock for reading. | |
198 | * @ubi: UBI device description object | |
199 | * @vol_id: volume ID | |
200 | * @lnum: logical eraseblock number | |
201 | * | |
202 | * This function locks a logical eraseblock for reading. Returns zero in case | |
203 | * of success and a negative error code in case of failure. | |
204 | */ | |
205 | static int leb_read_lock(struct ubi_device *ubi, int vol_id, int lnum) | |
206 | { | |
3a8d4642 | 207 | struct ubi_ltree_entry *le; |
801c135c AB |
208 | |
209 | le = ltree_add_entry(ubi, vol_id, lnum); | |
210 | if (IS_ERR(le)) | |
211 | return PTR_ERR(le); | |
212 | down_read(&le->mutex); | |
213 | return 0; | |
214 | } | |
215 | ||
216 | /** | |
217 | * leb_read_unlock - unlock logical eraseblock. | |
218 | * @ubi: UBI device description object | |
219 | * @vol_id: volume ID | |
220 | * @lnum: logical eraseblock number | |
221 | */ | |
222 | static void leb_read_unlock(struct ubi_device *ubi, int vol_id, int lnum) | |
223 | { | |
3a8d4642 | 224 | struct ubi_ltree_entry *le; |
801c135c AB |
225 | |
226 | spin_lock(&ubi->ltree_lock); | |
227 | le = ltree_lookup(ubi, vol_id, lnum); | |
228 | le->users -= 1; | |
229 | ubi_assert(le->users >= 0); | |
23add745 | 230 | up_read(&le->mutex); |
801c135c AB |
231 | if (le->users == 0) { |
232 | rb_erase(&le->rb, &ubi->ltree); | |
23add745 | 233 | kfree(le); |
801c135c AB |
234 | } |
235 | spin_unlock(&ubi->ltree_lock); | |
801c135c AB |
236 | } |
237 | ||
238 | /** | |
239 | * leb_write_lock - lock logical eraseblock for writing. | |
240 | * @ubi: UBI device description object | |
241 | * @vol_id: volume ID | |
242 | * @lnum: logical eraseblock number | |
243 | * | |
244 | * This function locks a logical eraseblock for writing. Returns zero in case | |
245 | * of success and a negative error code in case of failure. | |
246 | */ | |
247 | static int leb_write_lock(struct ubi_device *ubi, int vol_id, int lnum) | |
248 | { | |
3a8d4642 | 249 | struct ubi_ltree_entry *le; |
801c135c AB |
250 | |
251 | le = ltree_add_entry(ubi, vol_id, lnum); | |
252 | if (IS_ERR(le)) | |
253 | return PTR_ERR(le); | |
254 | down_write(&le->mutex); | |
255 | return 0; | |
256 | } | |
257 | ||
43f9b25a AB |
258 | /** |
259 | * leb_write_lock - lock logical eraseblock for writing. | |
260 | * @ubi: UBI device description object | |
261 | * @vol_id: volume ID | |
262 | * @lnum: logical eraseblock number | |
263 | * | |
264 | * This function locks a logical eraseblock for writing if there is no | |
265 | * contention and does nothing if there is contention. Returns %0 in case of | |
266 | * success, %1 in case of contention, and and a negative error code in case of | |
267 | * failure. | |
268 | */ | |
269 | static int leb_write_trylock(struct ubi_device *ubi, int vol_id, int lnum) | |
270 | { | |
43f9b25a AB |
271 | struct ubi_ltree_entry *le; |
272 | ||
273 | le = ltree_add_entry(ubi, vol_id, lnum); | |
274 | if (IS_ERR(le)) | |
275 | return PTR_ERR(le); | |
276 | if (down_write_trylock(&le->mutex)) | |
277 | return 0; | |
278 | ||
279 | /* Contention, cancel */ | |
280 | spin_lock(&ubi->ltree_lock); | |
281 | le->users -= 1; | |
282 | ubi_assert(le->users >= 0); | |
283 | if (le->users == 0) { | |
284 | rb_erase(&le->rb, &ubi->ltree); | |
b9a06623 | 285 | kfree(le); |
23add745 AB |
286 | } |
287 | spin_unlock(&ubi->ltree_lock); | |
43f9b25a AB |
288 | |
289 | return 1; | |
290 | } | |
291 | ||
801c135c AB |
292 | /** |
293 | * leb_write_unlock - unlock logical eraseblock. | |
294 | * @ubi: UBI device description object | |
295 | * @vol_id: volume ID | |
296 | * @lnum: logical eraseblock number | |
297 | */ | |
298 | static void leb_write_unlock(struct ubi_device *ubi, int vol_id, int lnum) | |
299 | { | |
3a8d4642 | 300 | struct ubi_ltree_entry *le; |
801c135c AB |
301 | |
302 | spin_lock(&ubi->ltree_lock); | |
303 | le = ltree_lookup(ubi, vol_id, lnum); | |
304 | le->users -= 1; | |
305 | ubi_assert(le->users >= 0); | |
23add745 | 306 | up_write(&le->mutex); |
801c135c AB |
307 | if (le->users == 0) { |
308 | rb_erase(&le->rb, &ubi->ltree); | |
b9a06623 | 309 | kfree(le); |
23add745 AB |
310 | } |
311 | spin_unlock(&ubi->ltree_lock); | |
801c135c AB |
312 | } |
313 | ||
314 | /** | |
315 | * ubi_eba_unmap_leb - un-map logical eraseblock. | |
316 | * @ubi: UBI device description object | |
89b96b69 | 317 | * @vol: volume description object |
801c135c AB |
318 | * @lnum: logical eraseblock number |
319 | * | |
320 | * This function un-maps logical eraseblock @lnum and schedules corresponding | |
321 | * physical eraseblock for erasure. Returns zero in case of success and a | |
322 | * negative error code in case of failure. | |
323 | */ | |
89b96b69 AB |
324 | int ubi_eba_unmap_leb(struct ubi_device *ubi, struct ubi_volume *vol, |
325 | int lnum) | |
801c135c | 326 | { |
89b96b69 | 327 | int err, pnum, vol_id = vol->vol_id; |
801c135c AB |
328 | |
329 | if (ubi->ro_mode) | |
330 | return -EROFS; | |
331 | ||
332 | err = leb_write_lock(ubi, vol_id, lnum); | |
333 | if (err) | |
334 | return err; | |
335 | ||
336 | pnum = vol->eba_tbl[lnum]; | |
337 | if (pnum < 0) | |
338 | /* This logical eraseblock is already unmapped */ | |
339 | goto out_unlock; | |
340 | ||
341 | dbg_eba("erase LEB %d:%d, PEB %d", vol_id, lnum, pnum); | |
342 | ||
8974b15c | 343 | down_read(&ubi->fm_sem); |
801c135c | 344 | vol->eba_tbl[lnum] = UBI_LEB_UNMAPPED; |
8974b15c | 345 | up_read(&ubi->fm_sem); |
d36e59e6 | 346 | err = ubi_wl_put_peb(ubi, vol_id, lnum, pnum, 0); |
801c135c AB |
347 | |
348 | out_unlock: | |
349 | leb_write_unlock(ubi, vol_id, lnum); | |
350 | return err; | |
351 | } | |
352 | ||
353 | /** | |
354 | * ubi_eba_read_leb - read data. | |
355 | * @ubi: UBI device description object | |
89b96b69 | 356 | * @vol: volume description object |
801c135c AB |
357 | * @lnum: logical eraseblock number |
358 | * @buf: buffer to store the read data | |
359 | * @offset: offset from where to read | |
360 | * @len: how many bytes to read | |
361 | * @check: data CRC check flag | |
362 | * | |
363 | * If the logical eraseblock @lnum is unmapped, @buf is filled with 0xFF | |
364 | * bytes. The @check flag only makes sense for static volumes and forces | |
365 | * eraseblock data CRC checking. | |
366 | * | |
367 | * In case of success this function returns zero. In case of a static volume, | |
368 | * if data CRC mismatches - %-EBADMSG is returned. %-EBADMSG may also be | |
369 | * returned for any volume type if an ECC error was detected by the MTD device | |
370 | * driver. Other negative error cored may be returned in case of other errors. | |
371 | */ | |
89b96b69 AB |
372 | int ubi_eba_read_leb(struct ubi_device *ubi, struct ubi_volume *vol, int lnum, |
373 | void *buf, int offset, int len, int check) | |
801c135c | 374 | { |
89b96b69 | 375 | int err, pnum, scrub = 0, vol_id = vol->vol_id; |
801c135c | 376 | struct ubi_vid_hdr *vid_hdr; |
a6343afb | 377 | uint32_t uninitialized_var(crc); |
801c135c AB |
378 | |
379 | err = leb_read_lock(ubi, vol_id, lnum); | |
380 | if (err) | |
381 | return err; | |
382 | ||
383 | pnum = vol->eba_tbl[lnum]; | |
384 | if (pnum < 0) { | |
385 | /* | |
386 | * The logical eraseblock is not mapped, fill the whole buffer | |
387 | * with 0xFF bytes. The exception is static volumes for which | |
388 | * it is an error to read unmapped logical eraseblocks. | |
389 | */ | |
390 | dbg_eba("read %d bytes from offset %d of LEB %d:%d (unmapped)", | |
391 | len, offset, vol_id, lnum); | |
392 | leb_read_unlock(ubi, vol_id, lnum); | |
393 | ubi_assert(vol->vol_type != UBI_STATIC_VOLUME); | |
394 | memset(buf, 0xFF, len); | |
395 | return 0; | |
396 | } | |
397 | ||
398 | dbg_eba("read %d bytes from offset %d of LEB %d:%d, PEB %d", | |
399 | len, offset, vol_id, lnum, pnum); | |
400 | ||
401 | if (vol->vol_type == UBI_DYNAMIC_VOLUME) | |
402 | check = 0; | |
403 | ||
404 | retry: | |
405 | if (check) { | |
33818bbb | 406 | vid_hdr = ubi_zalloc_vid_hdr(ubi, GFP_NOFS); |
801c135c AB |
407 | if (!vid_hdr) { |
408 | err = -ENOMEM; | |
409 | goto out_unlock; | |
410 | } | |
411 | ||
412 | err = ubi_io_read_vid_hdr(ubi, pnum, vid_hdr, 1); | |
413 | if (err && err != UBI_IO_BITFLIPS) { | |
414 | if (err > 0) { | |
415 | /* | |
416 | * The header is either absent or corrupted. | |
417 | * The former case means there is a bug - | |
418 | * switch to read-only mode just in case. | |
419 | * The latter case means a real corruption - we | |
420 | * may try to recover data. FIXME: but this is | |
421 | * not implemented. | |
422 | */ | |
756e1df1 | 423 | if (err == UBI_IO_BAD_HDR_EBADMSG || |
eb89580e | 424 | err == UBI_IO_BAD_HDR) { |
32608703 | 425 | ubi_warn(ubi, "corrupted VID header at PEB %d, LEB %d:%d", |
049333ce | 426 | pnum, vol_id, lnum); |
801c135c | 427 | err = -EBADMSG; |
b388e6a7 | 428 | } else { |
0e707ae7 | 429 | err = -EINVAL; |
801c135c | 430 | ubi_ro_mode(ubi); |
b388e6a7 | 431 | } |
801c135c AB |
432 | } |
433 | goto out_free; | |
434 | } else if (err == UBI_IO_BITFLIPS) | |
435 | scrub = 1; | |
436 | ||
3261ebd7 CH |
437 | ubi_assert(lnum < be32_to_cpu(vid_hdr->used_ebs)); |
438 | ubi_assert(len == be32_to_cpu(vid_hdr->data_size)); | |
801c135c | 439 | |
3261ebd7 | 440 | crc = be32_to_cpu(vid_hdr->data_crc); |
801c135c AB |
441 | ubi_free_vid_hdr(ubi, vid_hdr); |
442 | } | |
443 | ||
444 | err = ubi_io_read_data(ubi, buf, pnum, offset, len); | |
445 | if (err) { | |
170505f5 | 446 | if (err == UBI_IO_BITFLIPS) |
801c135c | 447 | scrub = 1; |
170505f5 | 448 | else if (mtd_is_eccerr(err)) { |
801c135c AB |
449 | if (vol->vol_type == UBI_DYNAMIC_VOLUME) |
450 | goto out_unlock; | |
451 | scrub = 1; | |
452 | if (!check) { | |
32608703 | 453 | ubi_msg(ubi, "force data checking"); |
801c135c AB |
454 | check = 1; |
455 | goto retry; | |
456 | } | |
457 | } else | |
458 | goto out_unlock; | |
459 | } | |
460 | ||
461 | if (check) { | |
2ab934b8 | 462 | uint32_t crc1 = crc32(UBI_CRC32_INIT, buf, len); |
801c135c | 463 | if (crc1 != crc) { |
32608703 | 464 | ubi_warn(ubi, "CRC error: calculated %#08x, must be %#08x", |
801c135c AB |
465 | crc1, crc); |
466 | err = -EBADMSG; | |
467 | goto out_unlock; | |
468 | } | |
469 | } | |
470 | ||
471 | if (scrub) | |
472 | err = ubi_wl_scrub_peb(ubi, pnum); | |
473 | ||
474 | leb_read_unlock(ubi, vol_id, lnum); | |
475 | return err; | |
476 | ||
477 | out_free: | |
478 | ubi_free_vid_hdr(ubi, vid_hdr); | |
479 | out_unlock: | |
480 | leb_read_unlock(ubi, vol_id, lnum); | |
481 | return err; | |
482 | } | |
483 | ||
9ff08979 RW |
484 | /** |
485 | * ubi_eba_read_leb_sg - read data into a scatter gather list. | |
486 | * @ubi: UBI device description object | |
487 | * @vol: volume description object | |
488 | * @lnum: logical eraseblock number | |
489 | * @sgl: UBI scatter gather list to store the read data | |
490 | * @offset: offset from where to read | |
491 | * @len: how many bytes to read | |
492 | * @check: data CRC check flag | |
493 | * | |
494 | * This function works exactly like ubi_eba_read_leb(). But instead of | |
495 | * storing the read data into a buffer it writes to an UBI scatter gather | |
496 | * list. | |
497 | */ | |
498 | int ubi_eba_read_leb_sg(struct ubi_device *ubi, struct ubi_volume *vol, | |
499 | struct ubi_sgl *sgl, int lnum, int offset, int len, | |
500 | int check) | |
501 | { | |
502 | int to_read; | |
503 | int ret; | |
504 | struct scatterlist *sg; | |
505 | ||
506 | for (;;) { | |
507 | ubi_assert(sgl->list_pos < UBI_MAX_SG_COUNT); | |
508 | sg = &sgl->sg[sgl->list_pos]; | |
509 | if (len < sg->length - sgl->page_pos) | |
510 | to_read = len; | |
511 | else | |
512 | to_read = sg->length - sgl->page_pos; | |
513 | ||
514 | ret = ubi_eba_read_leb(ubi, vol, lnum, | |
515 | sg_virt(sg) + sgl->page_pos, offset, | |
516 | to_read, check); | |
517 | if (ret < 0) | |
518 | return ret; | |
519 | ||
520 | offset += to_read; | |
521 | len -= to_read; | |
522 | if (!len) { | |
523 | sgl->page_pos += to_read; | |
524 | if (sgl->page_pos == sg->length) { | |
525 | sgl->list_pos++; | |
526 | sgl->page_pos = 0; | |
527 | } | |
528 | ||
529 | break; | |
530 | } | |
531 | ||
532 | sgl->list_pos++; | |
533 | sgl->page_pos = 0; | |
534 | } | |
535 | ||
536 | return ret; | |
537 | } | |
538 | ||
801c135c AB |
539 | /** |
540 | * recover_peb - recover from write failure. | |
541 | * @ubi: UBI device description object | |
542 | * @pnum: the physical eraseblock to recover | |
543 | * @vol_id: volume ID | |
544 | * @lnum: logical eraseblock number | |
545 | * @buf: data which was not written because of the write failure | |
546 | * @offset: offset of the failed write | |
547 | * @len: how many bytes should have been written | |
548 | * | |
549 | * This function is called in case of a write failure and moves all good data | |
550 | * from the potentially bad physical eraseblock to a good physical eraseblock. | |
551 | * This function also writes the data which was not written due to the failure. | |
552 | * Returns new physical eraseblock number in case of success, and a negative | |
553 | * error code in case of failure. | |
554 | */ | |
555 | static int recover_peb(struct ubi_device *ubi, int pnum, int vol_id, int lnum, | |
556 | const void *buf, int offset, int len) | |
557 | { | |
558 | int err, idx = vol_id2idx(ubi, vol_id), new_pnum, data_size, tries = 0; | |
559 | struct ubi_volume *vol = ubi->volumes[idx]; | |
560 | struct ubi_vid_hdr *vid_hdr; | |
801c135c | 561 | |
33818bbb | 562 | vid_hdr = ubi_zalloc_vid_hdr(ubi, GFP_NOFS); |
9c9ec147 | 563 | if (!vid_hdr) |
801c135c | 564 | return -ENOMEM; |
801c135c AB |
565 | |
566 | retry: | |
b36a261e | 567 | new_pnum = ubi_wl_get_peb(ubi); |
801c135c AB |
568 | if (new_pnum < 0) { |
569 | ubi_free_vid_hdr(ubi, vid_hdr); | |
570 | return new_pnum; | |
571 | } | |
572 | ||
32608703 TB |
573 | ubi_msg(ubi, "recover PEB %d, move data to PEB %d", |
574 | pnum, new_pnum); | |
801c135c AB |
575 | |
576 | err = ubi_io_read_vid_hdr(ubi, pnum, vid_hdr, 1); | |
577 | if (err && err != UBI_IO_BITFLIPS) { | |
578 | if (err > 0) | |
579 | err = -EIO; | |
580 | goto out_put; | |
581 | } | |
582 | ||
a7306653 | 583 | vid_hdr->sqnum = cpu_to_be64(ubi_next_sqnum(ubi)); |
801c135c AB |
584 | err = ubi_io_write_vid_hdr(ubi, new_pnum, vid_hdr); |
585 | if (err) | |
586 | goto write_error; | |
587 | ||
588 | data_size = offset + len; | |
4df581f3 | 589 | mutex_lock(&ubi->buf_mutex); |
0ca39d74 | 590 | memset(ubi->peb_buf + offset, 0xFF, len); |
801c135c AB |
591 | |
592 | /* Read everything before the area where the write failure happened */ | |
593 | if (offset > 0) { | |
0ca39d74 | 594 | err = ubi_io_read_data(ubi, ubi->peb_buf, pnum, 0, offset); |
e88d6e10 | 595 | if (err && err != UBI_IO_BITFLIPS) |
4df581f3 | 596 | goto out_unlock; |
801c135c AB |
597 | } |
598 | ||
0ca39d74 | 599 | memcpy(ubi->peb_buf + offset, buf, len); |
801c135c | 600 | |
0ca39d74 | 601 | err = ubi_io_write_data(ubi, ubi->peb_buf, new_pnum, 0, data_size); |
4df581f3 AB |
602 | if (err) { |
603 | mutex_unlock(&ubi->buf_mutex); | |
801c135c | 604 | goto write_error; |
4df581f3 | 605 | } |
801c135c | 606 | |
e88d6e10 | 607 | mutex_unlock(&ubi->buf_mutex); |
801c135c AB |
608 | ubi_free_vid_hdr(ubi, vid_hdr); |
609 | ||
8974b15c | 610 | down_read(&ubi->fm_sem); |
801c135c | 611 | vol->eba_tbl[lnum] = new_pnum; |
8974b15c | 612 | up_read(&ubi->fm_sem); |
d36e59e6 | 613 | ubi_wl_put_peb(ubi, vol_id, lnum, pnum, 1); |
801c135c | 614 | |
32608703 | 615 | ubi_msg(ubi, "data was successfully recovered"); |
801c135c AB |
616 | return 0; |
617 | ||
4df581f3 | 618 | out_unlock: |
e88d6e10 | 619 | mutex_unlock(&ubi->buf_mutex); |
4df581f3 | 620 | out_put: |
d36e59e6 | 621 | ubi_wl_put_peb(ubi, vol_id, lnum, new_pnum, 1); |
801c135c AB |
622 | ubi_free_vid_hdr(ubi, vid_hdr); |
623 | return err; | |
624 | ||
625 | write_error: | |
626 | /* | |
627 | * Bad luck? This physical eraseblock is bad too? Crud. Let's try to | |
628 | * get another one. | |
629 | */ | |
32608703 | 630 | ubi_warn(ubi, "failed to write to PEB %d", new_pnum); |
d36e59e6 | 631 | ubi_wl_put_peb(ubi, vol_id, lnum, new_pnum, 1); |
801c135c AB |
632 | if (++tries > UBI_IO_RETRIES) { |
633 | ubi_free_vid_hdr(ubi, vid_hdr); | |
634 | return err; | |
635 | } | |
32608703 | 636 | ubi_msg(ubi, "try again"); |
801c135c AB |
637 | goto retry; |
638 | } | |
639 | ||
640 | /** | |
641 | * ubi_eba_write_leb - write data to dynamic volume. | |
642 | * @ubi: UBI device description object | |
89b96b69 | 643 | * @vol: volume description object |
801c135c AB |
644 | * @lnum: logical eraseblock number |
645 | * @buf: the data to write | |
646 | * @offset: offset within the logical eraseblock where to write | |
647 | * @len: how many bytes to write | |
801c135c AB |
648 | * |
649 | * This function writes data to logical eraseblock @lnum of a dynamic volume | |
89b96b69 | 650 | * @vol. Returns zero in case of success and a negative error code in case |
801c135c AB |
651 | * of failure. In case of error, it is possible that something was still |
652 | * written to the flash media, but may be some garbage. | |
653 | */ | |
89b96b69 | 654 | int ubi_eba_write_leb(struct ubi_device *ubi, struct ubi_volume *vol, int lnum, |
b36a261e | 655 | const void *buf, int offset, int len) |
801c135c | 656 | { |
89b96b69 | 657 | int err, pnum, tries = 0, vol_id = vol->vol_id; |
801c135c AB |
658 | struct ubi_vid_hdr *vid_hdr; |
659 | ||
660 | if (ubi->ro_mode) | |
661 | return -EROFS; | |
662 | ||
663 | err = leb_write_lock(ubi, vol_id, lnum); | |
664 | if (err) | |
665 | return err; | |
666 | ||
667 | pnum = vol->eba_tbl[lnum]; | |
668 | if (pnum >= 0) { | |
669 | dbg_eba("write %d bytes at offset %d of LEB %d:%d, PEB %d", | |
670 | len, offset, vol_id, lnum, pnum); | |
671 | ||
672 | err = ubi_io_write_data(ubi, buf, pnum, offset, len); | |
673 | if (err) { | |
32608703 | 674 | ubi_warn(ubi, "failed to write data to PEB %d", pnum); |
801c135c | 675 | if (err == -EIO && ubi->bad_allowed) |
89b96b69 AB |
676 | err = recover_peb(ubi, pnum, vol_id, lnum, buf, |
677 | offset, len); | |
801c135c AB |
678 | if (err) |
679 | ubi_ro_mode(ubi); | |
680 | } | |
681 | leb_write_unlock(ubi, vol_id, lnum); | |
682 | return err; | |
683 | } | |
684 | ||
685 | /* | |
686 | * The logical eraseblock is not mapped. We have to get a free physical | |
687 | * eraseblock and write the volume identifier header there first. | |
688 | */ | |
33818bbb | 689 | vid_hdr = ubi_zalloc_vid_hdr(ubi, GFP_NOFS); |
801c135c AB |
690 | if (!vid_hdr) { |
691 | leb_write_unlock(ubi, vol_id, lnum); | |
692 | return -ENOMEM; | |
693 | } | |
694 | ||
695 | vid_hdr->vol_type = UBI_VID_DYNAMIC; | |
a7306653 | 696 | vid_hdr->sqnum = cpu_to_be64(ubi_next_sqnum(ubi)); |
3261ebd7 CH |
697 | vid_hdr->vol_id = cpu_to_be32(vol_id); |
698 | vid_hdr->lnum = cpu_to_be32(lnum); | |
801c135c | 699 | vid_hdr->compat = ubi_get_compat(ubi, vol_id); |
3261ebd7 | 700 | vid_hdr->data_pad = cpu_to_be32(vol->data_pad); |
801c135c AB |
701 | |
702 | retry: | |
b36a261e | 703 | pnum = ubi_wl_get_peb(ubi); |
801c135c AB |
704 | if (pnum < 0) { |
705 | ubi_free_vid_hdr(ubi, vid_hdr); | |
706 | leb_write_unlock(ubi, vol_id, lnum); | |
707 | return pnum; | |
708 | } | |
709 | ||
710 | dbg_eba("write VID hdr and %d bytes at offset %d of LEB %d:%d, PEB %d", | |
711 | len, offset, vol_id, lnum, pnum); | |
712 | ||
713 | err = ubi_io_write_vid_hdr(ubi, pnum, vid_hdr); | |
714 | if (err) { | |
32608703 | 715 | ubi_warn(ubi, "failed to write VID header to LEB %d:%d, PEB %d", |
801c135c AB |
716 | vol_id, lnum, pnum); |
717 | goto write_error; | |
718 | } | |
719 | ||
393852ec AB |
720 | if (len) { |
721 | err = ubi_io_write_data(ubi, buf, pnum, offset, len); | |
722 | if (err) { | |
32608703 | 723 | ubi_warn(ubi, "failed to write %d bytes at offset %d of LEB %d:%d, PEB %d", |
049333ce | 724 | len, offset, vol_id, lnum, pnum); |
393852ec AB |
725 | goto write_error; |
726 | } | |
801c135c AB |
727 | } |
728 | ||
8974b15c | 729 | down_read(&ubi->fm_sem); |
801c135c | 730 | vol->eba_tbl[lnum] = pnum; |
8974b15c | 731 | up_read(&ubi->fm_sem); |
801c135c AB |
732 | |
733 | leb_write_unlock(ubi, vol_id, lnum); | |
734 | ubi_free_vid_hdr(ubi, vid_hdr); | |
735 | return 0; | |
736 | ||
737 | write_error: | |
738 | if (err != -EIO || !ubi->bad_allowed) { | |
739 | ubi_ro_mode(ubi); | |
740 | leb_write_unlock(ubi, vol_id, lnum); | |
741 | ubi_free_vid_hdr(ubi, vid_hdr); | |
742 | return err; | |
743 | } | |
744 | ||
745 | /* | |
746 | * Fortunately, this is the first write operation to this physical | |
747 | * eraseblock, so just put it and request a new one. We assume that if | |
748 | * this physical eraseblock went bad, the erase code will handle that. | |
749 | */ | |
d36e59e6 | 750 | err = ubi_wl_put_peb(ubi, vol_id, lnum, pnum, 1); |
801c135c AB |
751 | if (err || ++tries > UBI_IO_RETRIES) { |
752 | ubi_ro_mode(ubi); | |
753 | leb_write_unlock(ubi, vol_id, lnum); | |
754 | ubi_free_vid_hdr(ubi, vid_hdr); | |
755 | return err; | |
756 | } | |
757 | ||
a7306653 | 758 | vid_hdr->sqnum = cpu_to_be64(ubi_next_sqnum(ubi)); |
32608703 | 759 | ubi_msg(ubi, "try another PEB"); |
801c135c AB |
760 | goto retry; |
761 | } | |
762 | ||
763 | /** | |
764 | * ubi_eba_write_leb_st - write data to static volume. | |
765 | * @ubi: UBI device description object | |
89b96b69 | 766 | * @vol: volume description object |
801c135c AB |
767 | * @lnum: logical eraseblock number |
768 | * @buf: data to write | |
769 | * @len: how many bytes to write | |
801c135c AB |
770 | * @used_ebs: how many logical eraseblocks will this volume contain |
771 | * | |
772 | * This function writes data to logical eraseblock @lnum of static volume | |
89b96b69 | 773 | * @vol. The @used_ebs argument should contain total number of logical |
801c135c AB |
774 | * eraseblock in this static volume. |
775 | * | |
776 | * When writing to the last logical eraseblock, the @len argument doesn't have | |
777 | * to be aligned to the minimal I/O unit size. Instead, it has to be equivalent | |
778 | * to the real data size, although the @buf buffer has to contain the | |
779 | * alignment. In all other cases, @len has to be aligned. | |
780 | * | |
025dfdaf | 781 | * It is prohibited to write more than once to logical eraseblocks of static |
801c135c AB |
782 | * volumes. This function returns zero in case of success and a negative error |
783 | * code in case of failure. | |
784 | */ | |
89b96b69 | 785 | int ubi_eba_write_leb_st(struct ubi_device *ubi, struct ubi_volume *vol, |
b36a261e | 786 | int lnum, const void *buf, int len, int used_ebs) |
801c135c | 787 | { |
89b96b69 | 788 | int err, pnum, tries = 0, data_size = len, vol_id = vol->vol_id; |
801c135c AB |
789 | struct ubi_vid_hdr *vid_hdr; |
790 | uint32_t crc; | |
791 | ||
792 | if (ubi->ro_mode) | |
793 | return -EROFS; | |
794 | ||
795 | if (lnum == used_ebs - 1) | |
796 | /* If this is the last LEB @len may be unaligned */ | |
797 | len = ALIGN(data_size, ubi->min_io_size); | |
798 | else | |
cadb40cc | 799 | ubi_assert(!(len & (ubi->min_io_size - 1))); |
801c135c | 800 | |
33818bbb | 801 | vid_hdr = ubi_zalloc_vid_hdr(ubi, GFP_NOFS); |
801c135c AB |
802 | if (!vid_hdr) |
803 | return -ENOMEM; | |
804 | ||
805 | err = leb_write_lock(ubi, vol_id, lnum); | |
806 | if (err) { | |
807 | ubi_free_vid_hdr(ubi, vid_hdr); | |
808 | return err; | |
809 | } | |
810 | ||
a7306653 | 811 | vid_hdr->sqnum = cpu_to_be64(ubi_next_sqnum(ubi)); |
3261ebd7 CH |
812 | vid_hdr->vol_id = cpu_to_be32(vol_id); |
813 | vid_hdr->lnum = cpu_to_be32(lnum); | |
801c135c | 814 | vid_hdr->compat = ubi_get_compat(ubi, vol_id); |
3261ebd7 | 815 | vid_hdr->data_pad = cpu_to_be32(vol->data_pad); |
801c135c AB |
816 | |
817 | crc = crc32(UBI_CRC32_INIT, buf, data_size); | |
818 | vid_hdr->vol_type = UBI_VID_STATIC; | |
3261ebd7 CH |
819 | vid_hdr->data_size = cpu_to_be32(data_size); |
820 | vid_hdr->used_ebs = cpu_to_be32(used_ebs); | |
821 | vid_hdr->data_crc = cpu_to_be32(crc); | |
801c135c AB |
822 | |
823 | retry: | |
b36a261e | 824 | pnum = ubi_wl_get_peb(ubi); |
801c135c AB |
825 | if (pnum < 0) { |
826 | ubi_free_vid_hdr(ubi, vid_hdr); | |
827 | leb_write_unlock(ubi, vol_id, lnum); | |
828 | return pnum; | |
829 | } | |
830 | ||
831 | dbg_eba("write VID hdr and %d bytes at LEB %d:%d, PEB %d, used_ebs %d", | |
832 | len, vol_id, lnum, pnum, used_ebs); | |
833 | ||
834 | err = ubi_io_write_vid_hdr(ubi, pnum, vid_hdr); | |
835 | if (err) { | |
32608703 | 836 | ubi_warn(ubi, "failed to write VID header to LEB %d:%d, PEB %d", |
801c135c AB |
837 | vol_id, lnum, pnum); |
838 | goto write_error; | |
839 | } | |
840 | ||
841 | err = ubi_io_write_data(ubi, buf, pnum, 0, len); | |
842 | if (err) { | |
32608703 | 843 | ubi_warn(ubi, "failed to write %d bytes of data to PEB %d", |
801c135c AB |
844 | len, pnum); |
845 | goto write_error; | |
846 | } | |
847 | ||
848 | ubi_assert(vol->eba_tbl[lnum] < 0); | |
8974b15c | 849 | down_read(&ubi->fm_sem); |
801c135c | 850 | vol->eba_tbl[lnum] = pnum; |
8974b15c | 851 | up_read(&ubi->fm_sem); |
801c135c AB |
852 | |
853 | leb_write_unlock(ubi, vol_id, lnum); | |
854 | ubi_free_vid_hdr(ubi, vid_hdr); | |
855 | return 0; | |
856 | ||
857 | write_error: | |
858 | if (err != -EIO || !ubi->bad_allowed) { | |
859 | /* | |
860 | * This flash device does not admit of bad eraseblocks or | |
861 | * something nasty and unexpected happened. Switch to read-only | |
862 | * mode just in case. | |
863 | */ | |
864 | ubi_ro_mode(ubi); | |
865 | leb_write_unlock(ubi, vol_id, lnum); | |
866 | ubi_free_vid_hdr(ubi, vid_hdr); | |
867 | return err; | |
868 | } | |
869 | ||
d36e59e6 | 870 | err = ubi_wl_put_peb(ubi, vol_id, lnum, pnum, 1); |
801c135c AB |
871 | if (err || ++tries > UBI_IO_RETRIES) { |
872 | ubi_ro_mode(ubi); | |
873 | leb_write_unlock(ubi, vol_id, lnum); | |
874 | ubi_free_vid_hdr(ubi, vid_hdr); | |
875 | return err; | |
876 | } | |
877 | ||
a7306653 | 878 | vid_hdr->sqnum = cpu_to_be64(ubi_next_sqnum(ubi)); |
32608703 | 879 | ubi_msg(ubi, "try another PEB"); |
801c135c AB |
880 | goto retry; |
881 | } | |
882 | ||
883 | /* | |
884 | * ubi_eba_atomic_leb_change - change logical eraseblock atomically. | |
885 | * @ubi: UBI device description object | |
c63a491d | 886 | * @vol: volume description object |
801c135c AB |
887 | * @lnum: logical eraseblock number |
888 | * @buf: data to write | |
889 | * @len: how many bytes to write | |
801c135c AB |
890 | * |
891 | * This function changes the contents of a logical eraseblock atomically. @buf | |
892 | * has to contain new logical eraseblock data, and @len - the length of the | |
893 | * data, which has to be aligned. This function guarantees that in case of an | |
894 | * unclean reboot the old contents is preserved. Returns zero in case of | |
895 | * success and a negative error code in case of failure. | |
e8823bd6 AB |
896 | * |
897 | * UBI reserves one LEB for the "atomic LEB change" operation, so only one | |
898 | * LEB change may be done at a time. This is ensured by @ubi->alc_mutex. | |
801c135c | 899 | */ |
89b96b69 | 900 | int ubi_eba_atomic_leb_change(struct ubi_device *ubi, struct ubi_volume *vol, |
b36a261e | 901 | int lnum, const void *buf, int len) |
801c135c | 902 | { |
89b96b69 | 903 | int err, pnum, tries = 0, vol_id = vol->vol_id; |
801c135c AB |
904 | struct ubi_vid_hdr *vid_hdr; |
905 | uint32_t crc; | |
906 | ||
907 | if (ubi->ro_mode) | |
908 | return -EROFS; | |
909 | ||
60c03153 AB |
910 | if (len == 0) { |
911 | /* | |
912 | * Special case when data length is zero. In this case the LEB | |
913 | * has to be unmapped and mapped somewhere else. | |
914 | */ | |
915 | err = ubi_eba_unmap_leb(ubi, vol, lnum); | |
916 | if (err) | |
917 | return err; | |
b36a261e | 918 | return ubi_eba_write_leb(ubi, vol, lnum, NULL, 0, 0); |
60c03153 AB |
919 | } |
920 | ||
33818bbb | 921 | vid_hdr = ubi_zalloc_vid_hdr(ubi, GFP_NOFS); |
801c135c AB |
922 | if (!vid_hdr) |
923 | return -ENOMEM; | |
924 | ||
e8823bd6 | 925 | mutex_lock(&ubi->alc_mutex); |
801c135c | 926 | err = leb_write_lock(ubi, vol_id, lnum); |
e8823bd6 AB |
927 | if (err) |
928 | goto out_mutex; | |
801c135c | 929 | |
a7306653 | 930 | vid_hdr->sqnum = cpu_to_be64(ubi_next_sqnum(ubi)); |
3261ebd7 CH |
931 | vid_hdr->vol_id = cpu_to_be32(vol_id); |
932 | vid_hdr->lnum = cpu_to_be32(lnum); | |
801c135c | 933 | vid_hdr->compat = ubi_get_compat(ubi, vol_id); |
3261ebd7 | 934 | vid_hdr->data_pad = cpu_to_be32(vol->data_pad); |
801c135c AB |
935 | |
936 | crc = crc32(UBI_CRC32_INIT, buf, len); | |
84a92580 | 937 | vid_hdr->vol_type = UBI_VID_DYNAMIC; |
3261ebd7 | 938 | vid_hdr->data_size = cpu_to_be32(len); |
801c135c | 939 | vid_hdr->copy_flag = 1; |
3261ebd7 | 940 | vid_hdr->data_crc = cpu_to_be32(crc); |
801c135c AB |
941 | |
942 | retry: | |
b36a261e | 943 | pnum = ubi_wl_get_peb(ubi); |
801c135c | 944 | if (pnum < 0) { |
e8823bd6 AB |
945 | err = pnum; |
946 | goto out_leb_unlock; | |
801c135c AB |
947 | } |
948 | ||
949 | dbg_eba("change LEB %d:%d, PEB %d, write VID hdr to PEB %d", | |
950 | vol_id, lnum, vol->eba_tbl[lnum], pnum); | |
951 | ||
952 | err = ubi_io_write_vid_hdr(ubi, pnum, vid_hdr); | |
953 | if (err) { | |
32608703 | 954 | ubi_warn(ubi, "failed to write VID header to LEB %d:%d, PEB %d", |
801c135c AB |
955 | vol_id, lnum, pnum); |
956 | goto write_error; | |
957 | } | |
958 | ||
959 | err = ubi_io_write_data(ubi, buf, pnum, 0, len); | |
960 | if (err) { | |
32608703 | 961 | ubi_warn(ubi, "failed to write %d bytes of data to PEB %d", |
801c135c AB |
962 | len, pnum); |
963 | goto write_error; | |
964 | } | |
965 | ||
a443db48 | 966 | if (vol->eba_tbl[lnum] >= 0) { |
d36e59e6 | 967 | err = ubi_wl_put_peb(ubi, vol_id, lnum, vol->eba_tbl[lnum], 0); |
e8823bd6 AB |
968 | if (err) |
969 | goto out_leb_unlock; | |
801c135c AB |
970 | } |
971 | ||
8974b15c | 972 | down_read(&ubi->fm_sem); |
801c135c | 973 | vol->eba_tbl[lnum] = pnum; |
8974b15c | 974 | up_read(&ubi->fm_sem); |
e8823bd6 AB |
975 | |
976 | out_leb_unlock: | |
801c135c | 977 | leb_write_unlock(ubi, vol_id, lnum); |
e8823bd6 AB |
978 | out_mutex: |
979 | mutex_unlock(&ubi->alc_mutex); | |
801c135c | 980 | ubi_free_vid_hdr(ubi, vid_hdr); |
e8823bd6 | 981 | return err; |
801c135c AB |
982 | |
983 | write_error: | |
984 | if (err != -EIO || !ubi->bad_allowed) { | |
985 | /* | |
986 | * This flash device does not admit of bad eraseblocks or | |
987 | * something nasty and unexpected happened. Switch to read-only | |
988 | * mode just in case. | |
989 | */ | |
990 | ubi_ro_mode(ubi); | |
e8823bd6 | 991 | goto out_leb_unlock; |
801c135c AB |
992 | } |
993 | ||
d36e59e6 | 994 | err = ubi_wl_put_peb(ubi, vol_id, lnum, pnum, 1); |
801c135c AB |
995 | if (err || ++tries > UBI_IO_RETRIES) { |
996 | ubi_ro_mode(ubi); | |
e8823bd6 | 997 | goto out_leb_unlock; |
801c135c AB |
998 | } |
999 | ||
a7306653 | 1000 | vid_hdr->sqnum = cpu_to_be64(ubi_next_sqnum(ubi)); |
32608703 | 1001 | ubi_msg(ubi, "try another PEB"); |
801c135c AB |
1002 | goto retry; |
1003 | } | |
1004 | ||
6b5c94c6 AB |
1005 | /** |
1006 | * is_error_sane - check whether a read error is sane. | |
1007 | * @err: code of the error happened during reading | |
1008 | * | |
1009 | * This is a helper function for 'ubi_eba_copy_leb()' which is called when we | |
1010 | * cannot read data from the target PEB (an error @err happened). If the error | |
1011 | * code is sane, then we treat this error as non-fatal. Otherwise the error is | |
1012 | * fatal and UBI will be switched to R/O mode later. | |
1013 | * | |
1014 | * The idea is that we try not to switch to R/O mode if the read error is | |
1015 | * something which suggests there was a real read problem. E.g., %-EIO. Or a | |
1016 | * memory allocation failed (-%ENOMEM). Otherwise, it is safer to switch to R/O | |
1017 | * mode, simply because we do not know what happened at the MTD level, and we | |
1018 | * cannot handle this. E.g., the underlying driver may have become crazy, and | |
1019 | * it is safer to switch to R/O mode to preserve the data. | |
1020 | * | |
1021 | * And bear in mind, this is about reading from the target PEB, i.e. the PEB | |
1022 | * which we have just written. | |
1023 | */ | |
1024 | static int is_error_sane(int err) | |
1025 | { | |
786d7831 | 1026 | if (err == -EIO || err == -ENOMEM || err == UBI_IO_BAD_HDR || |
756e1df1 | 1027 | err == UBI_IO_BAD_HDR_EBADMSG || err == -ETIMEDOUT) |
6b5c94c6 AB |
1028 | return 0; |
1029 | return 1; | |
1030 | } | |
1031 | ||
801c135c AB |
1032 | /** |
1033 | * ubi_eba_copy_leb - copy logical eraseblock. | |
1034 | * @ubi: UBI device description object | |
1035 | * @from: physical eraseblock number from where to copy | |
1036 | * @to: physical eraseblock number where to copy | |
1037 | * @vid_hdr: VID header of the @from physical eraseblock | |
1038 | * | |
1039 | * This function copies logical eraseblock from physical eraseblock @from to | |
1040 | * physical eraseblock @to. The @vid_hdr buffer may be changed by this | |
43f9b25a | 1041 | * function. Returns: |
6fa6f5bb | 1042 | * o %0 in case of success; |
cc831464 | 1043 | * o %MOVE_CANCEL_RACE, %MOVE_TARGET_WR_ERR, %MOVE_TARGET_BITFLIPS, etc; |
6fa6f5bb | 1044 | * o a negative error code in case of failure. |
801c135c AB |
1045 | */ |
1046 | int ubi_eba_copy_leb(struct ubi_device *ubi, int from, int to, | |
1047 | struct ubi_vid_hdr *vid_hdr) | |
1048 | { | |
43f9b25a | 1049 | int err, vol_id, lnum, data_size, aldata_size, idx; |
801c135c AB |
1050 | struct ubi_volume *vol; |
1051 | uint32_t crc; | |
801c135c | 1052 | |
3261ebd7 CH |
1053 | vol_id = be32_to_cpu(vid_hdr->vol_id); |
1054 | lnum = be32_to_cpu(vid_hdr->lnum); | |
801c135c | 1055 | |
87960c0b | 1056 | dbg_wl("copy LEB %d:%d, PEB %d to PEB %d", vol_id, lnum, from, to); |
801c135c AB |
1057 | |
1058 | if (vid_hdr->vol_type == UBI_VID_STATIC) { | |
3261ebd7 | 1059 | data_size = be32_to_cpu(vid_hdr->data_size); |
801c135c AB |
1060 | aldata_size = ALIGN(data_size, ubi->min_io_size); |
1061 | } else | |
1062 | data_size = aldata_size = | |
3261ebd7 | 1063 | ubi->leb_size - be32_to_cpu(vid_hdr->data_pad); |
801c135c | 1064 | |
801c135c | 1065 | idx = vol_id2idx(ubi, vol_id); |
43f9b25a | 1066 | spin_lock(&ubi->volumes_lock); |
801c135c | 1067 | /* |
43f9b25a AB |
1068 | * Note, we may race with volume deletion, which means that the volume |
1069 | * this logical eraseblock belongs to might be being deleted. Since the | |
6fa6f5bb | 1070 | * volume deletion un-maps all the volume's logical eraseblocks, it will |
43f9b25a | 1071 | * be locked in 'ubi_wl_put_peb()' and wait for the WL worker to finish. |
801c135c | 1072 | */ |
801c135c | 1073 | vol = ubi->volumes[idx]; |
90bf0265 | 1074 | spin_unlock(&ubi->volumes_lock); |
801c135c | 1075 | if (!vol) { |
43f9b25a | 1076 | /* No need to do further work, cancel */ |
87960c0b | 1077 | dbg_wl("volume %d is being removed, cancel", vol_id); |
90bf0265 | 1078 | return MOVE_CANCEL_RACE; |
801c135c AB |
1079 | } |
1080 | ||
43f9b25a AB |
1081 | /* |
1082 | * We do not want anybody to write to this logical eraseblock while we | |
1083 | * are moving it, so lock it. | |
1084 | * | |
1085 | * Note, we are using non-waiting locking here, because we cannot sleep | |
1086 | * on the LEB, since it may cause deadlocks. Indeed, imagine a task is | |
1087 | * unmapping the LEB which is mapped to the PEB we are going to move | |
1088 | * (@from). This task locks the LEB and goes sleep in the | |
1089 | * 'ubi_wl_put_peb()' function on the @ubi->move_mutex. In turn, we are | |
1090 | * holding @ubi->move_mutex and go sleep on the LEB lock. So, if the | |
90bf0265 | 1091 | * LEB is already locked, we just do not move it and return |
e801e128 BP |
1092 | * %MOVE_RETRY. Note, we do not return %MOVE_CANCEL_RACE here because |
1093 | * we do not know the reasons of the contention - it may be just a | |
1094 | * normal I/O on this LEB, so we want to re-try. | |
43f9b25a AB |
1095 | */ |
1096 | err = leb_write_trylock(ubi, vol_id, lnum); | |
1097 | if (err) { | |
87960c0b | 1098 | dbg_wl("contention on LEB %d:%d, cancel", vol_id, lnum); |
e801e128 | 1099 | return MOVE_RETRY; |
801c135c | 1100 | } |
801c135c | 1101 | |
43f9b25a AB |
1102 | /* |
1103 | * The LEB might have been put meanwhile, and the task which put it is | |
1104 | * probably waiting on @ubi->move_mutex. No need to continue the work, | |
1105 | * cancel it. | |
1106 | */ | |
1107 | if (vol->eba_tbl[lnum] != from) { | |
049333ce AB |
1108 | dbg_wl("LEB %d:%d is no longer mapped to PEB %d, mapped to PEB %d, cancel", |
1109 | vol_id, lnum, from, vol->eba_tbl[lnum]); | |
90bf0265 | 1110 | err = MOVE_CANCEL_RACE; |
43f9b25a AB |
1111 | goto out_unlock_leb; |
1112 | } | |
801c135c | 1113 | |
43f9b25a | 1114 | /* |
b77bcb07 | 1115 | * OK, now the LEB is locked and we can safely start moving it. Since |
0ca39d74 | 1116 | * this function utilizes the @ubi->peb_buf buffer which is shared |
90bf0265 | 1117 | * with some other functions - we lock the buffer by taking the |
43f9b25a AB |
1118 | * @ubi->buf_mutex. |
1119 | */ | |
1120 | mutex_lock(&ubi->buf_mutex); | |
87960c0b | 1121 | dbg_wl("read %d bytes of data", aldata_size); |
0ca39d74 | 1122 | err = ubi_io_read_data(ubi, ubi->peb_buf, from, 0, aldata_size); |
801c135c | 1123 | if (err && err != UBI_IO_BITFLIPS) { |
32608703 | 1124 | ubi_warn(ubi, "error %d while reading data from PEB %d", |
801c135c | 1125 | err, from); |
6b5c94c6 | 1126 | err = MOVE_SOURCE_RD_ERR; |
43f9b25a | 1127 | goto out_unlock_buf; |
801c135c AB |
1128 | } |
1129 | ||
1130 | /* | |
fd589a8f | 1131 | * Now we have got to calculate how much data we have to copy. In |
801c135c AB |
1132 | * case of a static volume it is fairly easy - the VID header contains |
1133 | * the data size. In case of a dynamic volume it is more difficult - we | |
1134 | * have to read the contents, cut 0xFF bytes from the end and copy only | |
1135 | * the first part. We must do this to avoid writing 0xFF bytes as it | |
1136 | * may have some side-effects. And not only this. It is important not | |
1137 | * to include those 0xFFs to CRC because later the they may be filled | |
1138 | * by data. | |
1139 | */ | |
1140 | if (vid_hdr->vol_type == UBI_VID_DYNAMIC) | |
1141 | aldata_size = data_size = | |
0ca39d74 | 1142 | ubi_calc_data_len(ubi, ubi->peb_buf, data_size); |
801c135c AB |
1143 | |
1144 | cond_resched(); | |
0ca39d74 | 1145 | crc = crc32(UBI_CRC32_INIT, ubi->peb_buf, data_size); |
801c135c AB |
1146 | cond_resched(); |
1147 | ||
1148 | /* | |
90bf0265 | 1149 | * It may turn out to be that the whole @from physical eraseblock |
801c135c AB |
1150 | * contains only 0xFF bytes. Then we have to only write the VID header |
1151 | * and do not write any data. This also means we should not set | |
1152 | * @vid_hdr->copy_flag, @vid_hdr->data_size, and @vid_hdr->data_crc. | |
1153 | */ | |
1154 | if (data_size > 0) { | |
1155 | vid_hdr->copy_flag = 1; | |
3261ebd7 CH |
1156 | vid_hdr->data_size = cpu_to_be32(data_size); |
1157 | vid_hdr->data_crc = cpu_to_be32(crc); | |
801c135c | 1158 | } |
a7306653 | 1159 | vid_hdr->sqnum = cpu_to_be64(ubi_next_sqnum(ubi)); |
801c135c AB |
1160 | |
1161 | err = ubi_io_write_vid_hdr(ubi, to, vid_hdr); | |
6fa6f5bb AB |
1162 | if (err) { |
1163 | if (err == -EIO) | |
90bf0265 | 1164 | err = MOVE_TARGET_WR_ERR; |
43f9b25a | 1165 | goto out_unlock_buf; |
6fa6f5bb | 1166 | } |
801c135c AB |
1167 | |
1168 | cond_resched(); | |
1169 | ||
1170 | /* Read the VID header back and check if it was written correctly */ | |
1171 | err = ubi_io_read_vid_hdr(ubi, to, vid_hdr, 1); | |
1172 | if (err) { | |
b86a2c56 | 1173 | if (err != UBI_IO_BITFLIPS) { |
32608703 | 1174 | ubi_warn(ubi, "error %d while reading VID header back from PEB %d", |
049333ce | 1175 | err, to); |
6b5c94c6 | 1176 | if (is_error_sane(err)) |
b86a2c56 AB |
1177 | err = MOVE_TARGET_RD_ERR; |
1178 | } else | |
cc831464 | 1179 | err = MOVE_TARGET_BITFLIPS; |
43f9b25a | 1180 | goto out_unlock_buf; |
801c135c AB |
1181 | } |
1182 | ||
1183 | if (data_size > 0) { | |
0ca39d74 | 1184 | err = ubi_io_write_data(ubi, ubi->peb_buf, to, 0, aldata_size); |
6fa6f5bb AB |
1185 | if (err) { |
1186 | if (err == -EIO) | |
90bf0265 | 1187 | err = MOVE_TARGET_WR_ERR; |
43f9b25a | 1188 | goto out_unlock_buf; |
6fa6f5bb | 1189 | } |
801c135c | 1190 | |
e88d6e10 AB |
1191 | cond_resched(); |
1192 | ||
801c135c AB |
1193 | /* |
1194 | * We've written the data and are going to read it back to make | |
1195 | * sure it was written correctly. | |
1196 | */ | |
0ca39d74 AB |
1197 | memset(ubi->peb_buf, 0xFF, aldata_size); |
1198 | err = ubi_io_read_data(ubi, ubi->peb_buf, to, 0, aldata_size); | |
801c135c | 1199 | if (err) { |
b86a2c56 | 1200 | if (err != UBI_IO_BITFLIPS) { |
32608703 | 1201 | ubi_warn(ubi, "error %d while reading data back from PEB %d", |
049333ce | 1202 | err, to); |
6b5c94c6 | 1203 | if (is_error_sane(err)) |
b86a2c56 AB |
1204 | err = MOVE_TARGET_RD_ERR; |
1205 | } else | |
cc831464 | 1206 | err = MOVE_TARGET_BITFLIPS; |
43f9b25a | 1207 | goto out_unlock_buf; |
801c135c AB |
1208 | } |
1209 | ||
1210 | cond_resched(); | |
1211 | ||
0ca39d74 | 1212 | if (crc != crc32(UBI_CRC32_INIT, ubi->peb_buf, data_size)) { |
32608703 | 1213 | ubi_warn(ubi, "read data back from PEB %d and it is different", |
049333ce | 1214 | to); |
6fa6f5bb | 1215 | err = -EINVAL; |
43f9b25a | 1216 | goto out_unlock_buf; |
801c135c AB |
1217 | } |
1218 | } | |
1219 | ||
1220 | ubi_assert(vol->eba_tbl[lnum] == from); | |
8974b15c | 1221 | down_read(&ubi->fm_sem); |
801c135c | 1222 | vol->eba_tbl[lnum] = to; |
8974b15c | 1223 | up_read(&ubi->fm_sem); |
801c135c | 1224 | |
43f9b25a | 1225 | out_unlock_buf: |
e88d6e10 | 1226 | mutex_unlock(&ubi->buf_mutex); |
43f9b25a | 1227 | out_unlock_leb: |
801c135c | 1228 | leb_write_unlock(ubi, vol_id, lnum); |
801c135c AB |
1229 | return err; |
1230 | } | |
1231 | ||
64d4b4c9 AB |
1232 | /** |
1233 | * print_rsvd_warning - warn about not having enough reserved PEBs. | |
1234 | * @ubi: UBI device description object | |
1235 | * | |
41e0cd9d | 1236 | * This is a helper function for 'ubi_eba_init()' which is called when UBI |
64d4b4c9 AB |
1237 | * cannot reserve enough PEBs for bad block handling. This function makes a |
1238 | * decision whether we have to print a warning or not. The algorithm is as | |
1239 | * follows: | |
1240 | * o if this is a new UBI image, then just print the warning | |
1241 | * o if this is an UBI image which has already been used for some time, print | |
1242 | * a warning only if we can reserve less than 10% of the expected amount of | |
1243 | * the reserved PEB. | |
1244 | * | |
1245 | * The idea is that when UBI is used, PEBs become bad, and the reserved pool | |
1246 | * of PEBs becomes smaller, which is normal and we do not want to scare users | |
1247 | * with a warning every time they attach the MTD device. This was an issue | |
1248 | * reported by real users. | |
1249 | */ | |
1250 | static void print_rsvd_warning(struct ubi_device *ubi, | |
a4e6042f | 1251 | struct ubi_attach_info *ai) |
64d4b4c9 AB |
1252 | { |
1253 | /* | |
1254 | * The 1 << 18 (256KiB) number is picked randomly, just a reasonably | |
1255 | * large number to distinguish between newly flashed and used images. | |
1256 | */ | |
a4e6042f | 1257 | if (ai->max_sqnum > (1 << 18)) { |
64d4b4c9 AB |
1258 | int min = ubi->beb_rsvd_level / 10; |
1259 | ||
1260 | if (!min) | |
1261 | min = 1; | |
1262 | if (ubi->beb_rsvd_pebs > min) | |
1263 | return; | |
1264 | } | |
1265 | ||
32608703 | 1266 | ubi_warn(ubi, "cannot reserve enough PEBs for bad PEB handling, reserved %d, need %d", |
049333ce | 1267 | ubi->beb_rsvd_pebs, ubi->beb_rsvd_level); |
5fc01ab6 | 1268 | if (ubi->corr_peb_count) |
32608703 | 1269 | ubi_warn(ubi, "%d PEBs are corrupted and not used", |
049333ce | 1270 | ubi->corr_peb_count); |
64d4b4c9 AB |
1271 | } |
1272 | ||
00abf304 RW |
1273 | /** |
1274 | * self_check_eba - run a self check on the EBA table constructed by fastmap. | |
1275 | * @ubi: UBI device description object | |
1276 | * @ai_fastmap: UBI attach info object created by fastmap | |
1277 | * @ai_scan: UBI attach info object created by scanning | |
1278 | * | |
1279 | * Returns < 0 in case of an internal error, 0 otherwise. | |
1280 | * If a bad EBA table entry was found it will be printed out and | |
1281 | * ubi_assert() triggers. | |
1282 | */ | |
1283 | int self_check_eba(struct ubi_device *ubi, struct ubi_attach_info *ai_fastmap, | |
1284 | struct ubi_attach_info *ai_scan) | |
1285 | { | |
1286 | int i, j, num_volumes, ret = 0; | |
1287 | int **scan_eba, **fm_eba; | |
1288 | struct ubi_ainf_volume *av; | |
1289 | struct ubi_volume *vol; | |
1290 | struct ubi_ainf_peb *aeb; | |
1291 | struct rb_node *rb; | |
1292 | ||
1293 | num_volumes = ubi->vtbl_slots + UBI_INT_VOL_COUNT; | |
1294 | ||
1295 | scan_eba = kmalloc(sizeof(*scan_eba) * num_volumes, GFP_KERNEL); | |
1296 | if (!scan_eba) | |
1297 | return -ENOMEM; | |
1298 | ||
1299 | fm_eba = kmalloc(sizeof(*fm_eba) * num_volumes, GFP_KERNEL); | |
1300 | if (!fm_eba) { | |
1301 | kfree(scan_eba); | |
1302 | return -ENOMEM; | |
1303 | } | |
1304 | ||
1305 | for (i = 0; i < num_volumes; i++) { | |
1306 | vol = ubi->volumes[i]; | |
1307 | if (!vol) | |
1308 | continue; | |
1309 | ||
1310 | scan_eba[i] = kmalloc(vol->reserved_pebs * sizeof(**scan_eba), | |
1311 | GFP_KERNEL); | |
1312 | if (!scan_eba[i]) { | |
1313 | ret = -ENOMEM; | |
1314 | goto out_free; | |
1315 | } | |
1316 | ||
1317 | fm_eba[i] = kmalloc(vol->reserved_pebs * sizeof(**fm_eba), | |
1318 | GFP_KERNEL); | |
1319 | if (!fm_eba[i]) { | |
1320 | ret = -ENOMEM; | |
1321 | goto out_free; | |
1322 | } | |
1323 | ||
1324 | for (j = 0; j < vol->reserved_pebs; j++) | |
1325 | scan_eba[i][j] = fm_eba[i][j] = UBI_LEB_UNMAPPED; | |
1326 | ||
1327 | av = ubi_find_av(ai_scan, idx2vol_id(ubi, i)); | |
1328 | if (!av) | |
1329 | continue; | |
1330 | ||
1331 | ubi_rb_for_each_entry(rb, aeb, &av->root, u.rb) | |
1332 | scan_eba[i][aeb->lnum] = aeb->pnum; | |
1333 | ||
1334 | av = ubi_find_av(ai_fastmap, idx2vol_id(ubi, i)); | |
1335 | if (!av) | |
1336 | continue; | |
1337 | ||
1338 | ubi_rb_for_each_entry(rb, aeb, &av->root, u.rb) | |
1339 | fm_eba[i][aeb->lnum] = aeb->pnum; | |
1340 | ||
1341 | for (j = 0; j < vol->reserved_pebs; j++) { | |
1342 | if (scan_eba[i][j] != fm_eba[i][j]) { | |
1343 | if (scan_eba[i][j] == UBI_LEB_UNMAPPED || | |
1344 | fm_eba[i][j] == UBI_LEB_UNMAPPED) | |
1345 | continue; | |
1346 | ||
32608703 | 1347 | ubi_err(ubi, "LEB:%i:%i is PEB:%i instead of %i!", |
00abf304 RW |
1348 | vol->vol_id, i, fm_eba[i][j], |
1349 | scan_eba[i][j]); | |
1350 | ubi_assert(0); | |
1351 | } | |
1352 | } | |
1353 | } | |
1354 | ||
1355 | out_free: | |
1356 | for (i = 0; i < num_volumes; i++) { | |
1357 | if (!ubi->volumes[i]) | |
1358 | continue; | |
1359 | ||
1360 | kfree(scan_eba[i]); | |
1361 | kfree(fm_eba[i]); | |
1362 | } | |
1363 | ||
1364 | kfree(scan_eba); | |
1365 | kfree(fm_eba); | |
1366 | return ret; | |
1367 | } | |
1368 | ||
801c135c | 1369 | /** |
41e0cd9d | 1370 | * ubi_eba_init - initialize the EBA sub-system using attaching information. |
801c135c | 1371 | * @ubi: UBI device description object |
a4e6042f | 1372 | * @ai: attaching information |
801c135c AB |
1373 | * |
1374 | * This function returns zero in case of success and a negative error code in | |
1375 | * case of failure. | |
1376 | */ | |
41e0cd9d | 1377 | int ubi_eba_init(struct ubi_device *ubi, struct ubi_attach_info *ai) |
801c135c AB |
1378 | { |
1379 | int i, j, err, num_volumes; | |
517af48c | 1380 | struct ubi_ainf_volume *av; |
801c135c | 1381 | struct ubi_volume *vol; |
2c5ec5ce | 1382 | struct ubi_ainf_peb *aeb; |
801c135c AB |
1383 | struct rb_node *rb; |
1384 | ||
85c6e6e2 | 1385 | dbg_eba("initialize EBA sub-system"); |
801c135c AB |
1386 | |
1387 | spin_lock_init(&ubi->ltree_lock); | |
e8823bd6 | 1388 | mutex_init(&ubi->alc_mutex); |
801c135c AB |
1389 | ubi->ltree = RB_ROOT; |
1390 | ||
a4e6042f | 1391 | ubi->global_sqnum = ai->max_sqnum + 1; |
801c135c AB |
1392 | num_volumes = ubi->vtbl_slots + UBI_INT_VOL_COUNT; |
1393 | ||
1394 | for (i = 0; i < num_volumes; i++) { | |
1395 | vol = ubi->volumes[i]; | |
1396 | if (!vol) | |
1397 | continue; | |
1398 | ||
1399 | cond_resched(); | |
1400 | ||
1401 | vol->eba_tbl = kmalloc(vol->reserved_pebs * sizeof(int), | |
1402 | GFP_KERNEL); | |
1403 | if (!vol->eba_tbl) { | |
1404 | err = -ENOMEM; | |
1405 | goto out_free; | |
1406 | } | |
1407 | ||
1408 | for (j = 0; j < vol->reserved_pebs; j++) | |
1409 | vol->eba_tbl[j] = UBI_LEB_UNMAPPED; | |
1410 | ||
dcd85fdd | 1411 | av = ubi_find_av(ai, idx2vol_id(ubi, i)); |
517af48c | 1412 | if (!av) |
801c135c AB |
1413 | continue; |
1414 | ||
517af48c | 1415 | ubi_rb_for_each_entry(rb, aeb, &av->root, u.rb) { |
2c5ec5ce | 1416 | if (aeb->lnum >= vol->reserved_pebs) |
801c135c AB |
1417 | /* |
1418 | * This may happen in case of an unclean reboot | |
1419 | * during re-size. | |
1420 | */ | |
0bae2887 | 1421 | ubi_move_aeb_to_list(av, aeb, &ai->erase); |
d74adbdb BN |
1422 | else |
1423 | vol->eba_tbl[aeb->lnum] = aeb->pnum; | |
801c135c AB |
1424 | } |
1425 | } | |
1426 | ||
94780d4d | 1427 | if (ubi->avail_pebs < EBA_RESERVED_PEBS) { |
32608703 | 1428 | ubi_err(ubi, "no enough physical eraseblocks (%d, need %d)", |
94780d4d | 1429 | ubi->avail_pebs, EBA_RESERVED_PEBS); |
5fc01ab6 | 1430 | if (ubi->corr_peb_count) |
32608703 | 1431 | ubi_err(ubi, "%d PEBs are corrupted and not used", |
5fc01ab6 | 1432 | ubi->corr_peb_count); |
94780d4d AB |
1433 | err = -ENOSPC; |
1434 | goto out_free; | |
1435 | } | |
1436 | ubi->avail_pebs -= EBA_RESERVED_PEBS; | |
1437 | ubi->rsvd_pebs += EBA_RESERVED_PEBS; | |
1438 | ||
801c135c AB |
1439 | if (ubi->bad_allowed) { |
1440 | ubi_calculate_reserved(ubi); | |
1441 | ||
1442 | if (ubi->avail_pebs < ubi->beb_rsvd_level) { | |
1443 | /* No enough free physical eraseblocks */ | |
1444 | ubi->beb_rsvd_pebs = ubi->avail_pebs; | |
a4e6042f | 1445 | print_rsvd_warning(ubi, ai); |
801c135c AB |
1446 | } else |
1447 | ubi->beb_rsvd_pebs = ubi->beb_rsvd_level; | |
1448 | ||
1449 | ubi->avail_pebs -= ubi->beb_rsvd_pebs; | |
1450 | ubi->rsvd_pebs += ubi->beb_rsvd_pebs; | |
1451 | } | |
1452 | ||
85c6e6e2 | 1453 | dbg_eba("EBA sub-system is initialized"); |
801c135c AB |
1454 | return 0; |
1455 | ||
1456 | out_free: | |
1457 | for (i = 0; i < num_volumes; i++) { | |
1458 | if (!ubi->volumes[i]) | |
1459 | continue; | |
1460 | kfree(ubi->volumes[i]->eba_tbl); | |
7194e6f9 | 1461 | ubi->volumes[i]->eba_tbl = NULL; |
801c135c | 1462 | } |
801c135c AB |
1463 | return err; |
1464 | } |