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 | ||
111ab0b2 | 343 | down_read(&ubi->fm_eba_sem); |
801c135c | 344 | vol->eba_tbl[lnum] = UBI_LEB_UNMAPPED; |
111ab0b2 | 345 | up_read(&ubi->fm_eba_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 { |
1900149c RW |
429 | /* |
430 | * Ending up here in the non-Fastmap case | |
431 | * is a clear bug as the VID header had to | |
432 | * be present at scan time to have it referenced. | |
433 | * With fastmap the story is more complicated. | |
434 | * Fastmap has the mapping info without the need | |
435 | * of a full scan. So the LEB could have been | |
436 | * unmapped, Fastmap cannot know this and keeps | |
437 | * the LEB referenced. | |
438 | * This is valid and works as the layer above UBI | |
439 | * has to do bookkeeping about used/referenced | |
440 | * LEBs in any case. | |
441 | */ | |
442 | if (ubi->fast_attach) { | |
443 | err = -EBADMSG; | |
444 | } else { | |
445 | err = -EINVAL; | |
446 | ubi_ro_mode(ubi); | |
447 | } | |
b388e6a7 | 448 | } |
801c135c AB |
449 | } |
450 | goto out_free; | |
451 | } else if (err == UBI_IO_BITFLIPS) | |
452 | scrub = 1; | |
453 | ||
3261ebd7 CH |
454 | ubi_assert(lnum < be32_to_cpu(vid_hdr->used_ebs)); |
455 | ubi_assert(len == be32_to_cpu(vid_hdr->data_size)); | |
801c135c | 456 | |
3261ebd7 | 457 | crc = be32_to_cpu(vid_hdr->data_crc); |
801c135c AB |
458 | ubi_free_vid_hdr(ubi, vid_hdr); |
459 | } | |
460 | ||
461 | err = ubi_io_read_data(ubi, buf, pnum, offset, len); | |
462 | if (err) { | |
170505f5 | 463 | if (err == UBI_IO_BITFLIPS) |
801c135c | 464 | scrub = 1; |
170505f5 | 465 | else if (mtd_is_eccerr(err)) { |
801c135c AB |
466 | if (vol->vol_type == UBI_DYNAMIC_VOLUME) |
467 | goto out_unlock; | |
468 | scrub = 1; | |
469 | if (!check) { | |
32608703 | 470 | ubi_msg(ubi, "force data checking"); |
801c135c AB |
471 | check = 1; |
472 | goto retry; | |
473 | } | |
474 | } else | |
475 | goto out_unlock; | |
476 | } | |
477 | ||
478 | if (check) { | |
2ab934b8 | 479 | uint32_t crc1 = crc32(UBI_CRC32_INIT, buf, len); |
801c135c | 480 | if (crc1 != crc) { |
32608703 | 481 | ubi_warn(ubi, "CRC error: calculated %#08x, must be %#08x", |
801c135c AB |
482 | crc1, crc); |
483 | err = -EBADMSG; | |
484 | goto out_unlock; | |
485 | } | |
486 | } | |
487 | ||
488 | if (scrub) | |
489 | err = ubi_wl_scrub_peb(ubi, pnum); | |
490 | ||
491 | leb_read_unlock(ubi, vol_id, lnum); | |
492 | return err; | |
493 | ||
494 | out_free: | |
495 | ubi_free_vid_hdr(ubi, vid_hdr); | |
496 | out_unlock: | |
497 | leb_read_unlock(ubi, vol_id, lnum); | |
498 | return err; | |
499 | } | |
500 | ||
9ff08979 RW |
501 | /** |
502 | * ubi_eba_read_leb_sg - read data into a scatter gather list. | |
503 | * @ubi: UBI device description object | |
504 | * @vol: volume description object | |
505 | * @lnum: logical eraseblock number | |
506 | * @sgl: UBI scatter gather list to store the read data | |
507 | * @offset: offset from where to read | |
508 | * @len: how many bytes to read | |
509 | * @check: data CRC check flag | |
510 | * | |
511 | * This function works exactly like ubi_eba_read_leb(). But instead of | |
512 | * storing the read data into a buffer it writes to an UBI scatter gather | |
513 | * list. | |
514 | */ | |
515 | int ubi_eba_read_leb_sg(struct ubi_device *ubi, struct ubi_volume *vol, | |
516 | struct ubi_sgl *sgl, int lnum, int offset, int len, | |
517 | int check) | |
518 | { | |
519 | int to_read; | |
520 | int ret; | |
521 | struct scatterlist *sg; | |
522 | ||
523 | for (;;) { | |
524 | ubi_assert(sgl->list_pos < UBI_MAX_SG_COUNT); | |
525 | sg = &sgl->sg[sgl->list_pos]; | |
526 | if (len < sg->length - sgl->page_pos) | |
527 | to_read = len; | |
528 | else | |
529 | to_read = sg->length - sgl->page_pos; | |
530 | ||
531 | ret = ubi_eba_read_leb(ubi, vol, lnum, | |
532 | sg_virt(sg) + sgl->page_pos, offset, | |
533 | to_read, check); | |
534 | if (ret < 0) | |
535 | return ret; | |
536 | ||
537 | offset += to_read; | |
538 | len -= to_read; | |
539 | if (!len) { | |
540 | sgl->page_pos += to_read; | |
541 | if (sgl->page_pos == sg->length) { | |
542 | sgl->list_pos++; | |
543 | sgl->page_pos = 0; | |
544 | } | |
545 | ||
546 | break; | |
547 | } | |
548 | ||
549 | sgl->list_pos++; | |
550 | sgl->page_pos = 0; | |
551 | } | |
552 | ||
553 | return ret; | |
554 | } | |
555 | ||
801c135c AB |
556 | /** |
557 | * recover_peb - recover from write failure. | |
558 | * @ubi: UBI device description object | |
559 | * @pnum: the physical eraseblock to recover | |
560 | * @vol_id: volume ID | |
561 | * @lnum: logical eraseblock number | |
562 | * @buf: data which was not written because of the write failure | |
563 | * @offset: offset of the failed write | |
564 | * @len: how many bytes should have been written | |
565 | * | |
566 | * This function is called in case of a write failure and moves all good data | |
567 | * from the potentially bad physical eraseblock to a good physical eraseblock. | |
568 | * This function also writes the data which was not written due to the failure. | |
569 | * Returns new physical eraseblock number in case of success, and a negative | |
570 | * error code in case of failure. | |
571 | */ | |
572 | static int recover_peb(struct ubi_device *ubi, int pnum, int vol_id, int lnum, | |
573 | const void *buf, int offset, int len) | |
574 | { | |
575 | int err, idx = vol_id2idx(ubi, vol_id), new_pnum, data_size, tries = 0; | |
576 | struct ubi_volume *vol = ubi->volumes[idx]; | |
577 | struct ubi_vid_hdr *vid_hdr; | |
801c135c | 578 | |
33818bbb | 579 | vid_hdr = ubi_zalloc_vid_hdr(ubi, GFP_NOFS); |
9c9ec147 | 580 | if (!vid_hdr) |
801c135c | 581 | return -ENOMEM; |
801c135c AB |
582 | |
583 | retry: | |
b36a261e | 584 | new_pnum = ubi_wl_get_peb(ubi); |
801c135c AB |
585 | if (new_pnum < 0) { |
586 | ubi_free_vid_hdr(ubi, vid_hdr); | |
111ab0b2 | 587 | up_read(&ubi->fm_eba_sem); |
801c135c AB |
588 | return new_pnum; |
589 | } | |
590 | ||
32608703 TB |
591 | ubi_msg(ubi, "recover PEB %d, move data to PEB %d", |
592 | pnum, new_pnum); | |
801c135c AB |
593 | |
594 | err = ubi_io_read_vid_hdr(ubi, pnum, vid_hdr, 1); | |
595 | if (err && err != UBI_IO_BITFLIPS) { | |
596 | if (err > 0) | |
597 | err = -EIO; | |
111ab0b2 | 598 | up_read(&ubi->fm_eba_sem); |
801c135c AB |
599 | goto out_put; |
600 | } | |
601 | ||
a7306653 | 602 | vid_hdr->sqnum = cpu_to_be64(ubi_next_sqnum(ubi)); |
801c135c | 603 | err = ubi_io_write_vid_hdr(ubi, new_pnum, vid_hdr); |
8fb2a514 | 604 | if (err) { |
111ab0b2 | 605 | up_read(&ubi->fm_eba_sem); |
801c135c | 606 | goto write_error; |
8fb2a514 | 607 | } |
801c135c AB |
608 | |
609 | data_size = offset + len; | |
4df581f3 | 610 | mutex_lock(&ubi->buf_mutex); |
0ca39d74 | 611 | memset(ubi->peb_buf + offset, 0xFF, len); |
801c135c AB |
612 | |
613 | /* Read everything before the area where the write failure happened */ | |
614 | if (offset > 0) { | |
0ca39d74 | 615 | err = ubi_io_read_data(ubi, ubi->peb_buf, pnum, 0, offset); |
8fb2a514 | 616 | if (err && err != UBI_IO_BITFLIPS) { |
111ab0b2 | 617 | up_read(&ubi->fm_eba_sem); |
4df581f3 | 618 | goto out_unlock; |
8fb2a514 | 619 | } |
801c135c AB |
620 | } |
621 | ||
0ca39d74 | 622 | memcpy(ubi->peb_buf + offset, buf, len); |
801c135c | 623 | |
0ca39d74 | 624 | err = ubi_io_write_data(ubi, ubi->peb_buf, new_pnum, 0, data_size); |
4df581f3 AB |
625 | if (err) { |
626 | mutex_unlock(&ubi->buf_mutex); | |
111ab0b2 | 627 | up_read(&ubi->fm_eba_sem); |
801c135c | 628 | goto write_error; |
4df581f3 | 629 | } |
801c135c | 630 | |
e88d6e10 | 631 | mutex_unlock(&ubi->buf_mutex); |
801c135c AB |
632 | ubi_free_vid_hdr(ubi, vid_hdr); |
633 | ||
634 | vol->eba_tbl[lnum] = new_pnum; | |
111ab0b2 | 635 | up_read(&ubi->fm_eba_sem); |
d36e59e6 | 636 | ubi_wl_put_peb(ubi, vol_id, lnum, pnum, 1); |
801c135c | 637 | |
32608703 | 638 | ubi_msg(ubi, "data was successfully recovered"); |
801c135c AB |
639 | return 0; |
640 | ||
4df581f3 | 641 | out_unlock: |
e88d6e10 | 642 | mutex_unlock(&ubi->buf_mutex); |
4df581f3 | 643 | out_put: |
d36e59e6 | 644 | ubi_wl_put_peb(ubi, vol_id, lnum, new_pnum, 1); |
801c135c AB |
645 | ubi_free_vid_hdr(ubi, vid_hdr); |
646 | return err; | |
647 | ||
648 | write_error: | |
649 | /* | |
650 | * Bad luck? This physical eraseblock is bad too? Crud. Let's try to | |
651 | * get another one. | |
652 | */ | |
32608703 | 653 | ubi_warn(ubi, "failed to write to PEB %d", new_pnum); |
d36e59e6 | 654 | ubi_wl_put_peb(ubi, vol_id, lnum, new_pnum, 1); |
801c135c AB |
655 | if (++tries > UBI_IO_RETRIES) { |
656 | ubi_free_vid_hdr(ubi, vid_hdr); | |
657 | return err; | |
658 | } | |
32608703 | 659 | ubi_msg(ubi, "try again"); |
801c135c AB |
660 | goto retry; |
661 | } | |
662 | ||
663 | /** | |
664 | * ubi_eba_write_leb - write data to dynamic volume. | |
665 | * @ubi: UBI device description object | |
89b96b69 | 666 | * @vol: volume description object |
801c135c AB |
667 | * @lnum: logical eraseblock number |
668 | * @buf: the data to write | |
669 | * @offset: offset within the logical eraseblock where to write | |
670 | * @len: how many bytes to write | |
801c135c AB |
671 | * |
672 | * This function writes data to logical eraseblock @lnum of a dynamic volume | |
89b96b69 | 673 | * @vol. Returns zero in case of success and a negative error code in case |
801c135c AB |
674 | * of failure. In case of error, it is possible that something was still |
675 | * written to the flash media, but may be some garbage. | |
676 | */ | |
89b96b69 | 677 | int ubi_eba_write_leb(struct ubi_device *ubi, struct ubi_volume *vol, int lnum, |
b36a261e | 678 | const void *buf, int offset, int len) |
801c135c | 679 | { |
89b96b69 | 680 | int err, pnum, tries = 0, vol_id = vol->vol_id; |
801c135c AB |
681 | struct ubi_vid_hdr *vid_hdr; |
682 | ||
683 | if (ubi->ro_mode) | |
684 | return -EROFS; | |
685 | ||
686 | err = leb_write_lock(ubi, vol_id, lnum); | |
687 | if (err) | |
688 | return err; | |
689 | ||
690 | pnum = vol->eba_tbl[lnum]; | |
691 | if (pnum >= 0) { | |
692 | dbg_eba("write %d bytes at offset %d of LEB %d:%d, PEB %d", | |
693 | len, offset, vol_id, lnum, pnum); | |
694 | ||
695 | err = ubi_io_write_data(ubi, buf, pnum, offset, len); | |
696 | if (err) { | |
32608703 | 697 | ubi_warn(ubi, "failed to write data to PEB %d", pnum); |
801c135c | 698 | if (err == -EIO && ubi->bad_allowed) |
89b96b69 AB |
699 | err = recover_peb(ubi, pnum, vol_id, lnum, buf, |
700 | offset, len); | |
801c135c AB |
701 | if (err) |
702 | ubi_ro_mode(ubi); | |
703 | } | |
704 | leb_write_unlock(ubi, vol_id, lnum); | |
705 | return err; | |
706 | } | |
707 | ||
708 | /* | |
709 | * The logical eraseblock is not mapped. We have to get a free physical | |
710 | * eraseblock and write the volume identifier header there first. | |
711 | */ | |
33818bbb | 712 | vid_hdr = ubi_zalloc_vid_hdr(ubi, GFP_NOFS); |
801c135c AB |
713 | if (!vid_hdr) { |
714 | leb_write_unlock(ubi, vol_id, lnum); | |
715 | return -ENOMEM; | |
716 | } | |
717 | ||
718 | vid_hdr->vol_type = UBI_VID_DYNAMIC; | |
a7306653 | 719 | vid_hdr->sqnum = cpu_to_be64(ubi_next_sqnum(ubi)); |
3261ebd7 CH |
720 | vid_hdr->vol_id = cpu_to_be32(vol_id); |
721 | vid_hdr->lnum = cpu_to_be32(lnum); | |
801c135c | 722 | vid_hdr->compat = ubi_get_compat(ubi, vol_id); |
3261ebd7 | 723 | vid_hdr->data_pad = cpu_to_be32(vol->data_pad); |
801c135c AB |
724 | |
725 | retry: | |
b36a261e | 726 | pnum = ubi_wl_get_peb(ubi); |
801c135c AB |
727 | if (pnum < 0) { |
728 | ubi_free_vid_hdr(ubi, vid_hdr); | |
729 | leb_write_unlock(ubi, vol_id, lnum); | |
111ab0b2 | 730 | up_read(&ubi->fm_eba_sem); |
801c135c AB |
731 | return pnum; |
732 | } | |
733 | ||
734 | dbg_eba("write VID hdr and %d bytes at offset %d of LEB %d:%d, PEB %d", | |
735 | len, offset, vol_id, lnum, pnum); | |
736 | ||
737 | err = ubi_io_write_vid_hdr(ubi, pnum, vid_hdr); | |
738 | if (err) { | |
32608703 | 739 | ubi_warn(ubi, "failed to write VID header to LEB %d:%d, PEB %d", |
801c135c | 740 | vol_id, lnum, pnum); |
111ab0b2 | 741 | up_read(&ubi->fm_eba_sem); |
801c135c AB |
742 | goto write_error; |
743 | } | |
744 | ||
393852ec AB |
745 | if (len) { |
746 | err = ubi_io_write_data(ubi, buf, pnum, offset, len); | |
747 | if (err) { | |
32608703 | 748 | ubi_warn(ubi, "failed to write %d bytes at offset %d of LEB %d:%d, PEB %d", |
049333ce | 749 | len, offset, vol_id, lnum, pnum); |
111ab0b2 | 750 | up_read(&ubi->fm_eba_sem); |
393852ec AB |
751 | goto write_error; |
752 | } | |
801c135c AB |
753 | } |
754 | ||
755 | vol->eba_tbl[lnum] = pnum; | |
111ab0b2 | 756 | up_read(&ubi->fm_eba_sem); |
801c135c AB |
757 | |
758 | leb_write_unlock(ubi, vol_id, lnum); | |
759 | ubi_free_vid_hdr(ubi, vid_hdr); | |
760 | return 0; | |
761 | ||
762 | write_error: | |
763 | if (err != -EIO || !ubi->bad_allowed) { | |
764 | ubi_ro_mode(ubi); | |
765 | leb_write_unlock(ubi, vol_id, lnum); | |
766 | ubi_free_vid_hdr(ubi, vid_hdr); | |
767 | return err; | |
768 | } | |
769 | ||
770 | /* | |
771 | * Fortunately, this is the first write operation to this physical | |
772 | * eraseblock, so just put it and request a new one. We assume that if | |
773 | * this physical eraseblock went bad, the erase code will handle that. | |
774 | */ | |
d36e59e6 | 775 | err = ubi_wl_put_peb(ubi, vol_id, lnum, pnum, 1); |
801c135c AB |
776 | if (err || ++tries > UBI_IO_RETRIES) { |
777 | ubi_ro_mode(ubi); | |
778 | leb_write_unlock(ubi, vol_id, lnum); | |
779 | ubi_free_vid_hdr(ubi, vid_hdr); | |
780 | return err; | |
781 | } | |
782 | ||
a7306653 | 783 | vid_hdr->sqnum = cpu_to_be64(ubi_next_sqnum(ubi)); |
32608703 | 784 | ubi_msg(ubi, "try another PEB"); |
801c135c AB |
785 | goto retry; |
786 | } | |
787 | ||
788 | /** | |
789 | * ubi_eba_write_leb_st - write data to static volume. | |
790 | * @ubi: UBI device description object | |
89b96b69 | 791 | * @vol: volume description object |
801c135c AB |
792 | * @lnum: logical eraseblock number |
793 | * @buf: data to write | |
794 | * @len: how many bytes to write | |
801c135c AB |
795 | * @used_ebs: how many logical eraseblocks will this volume contain |
796 | * | |
797 | * This function writes data to logical eraseblock @lnum of static volume | |
89b96b69 | 798 | * @vol. The @used_ebs argument should contain total number of logical |
801c135c AB |
799 | * eraseblock in this static volume. |
800 | * | |
801 | * When writing to the last logical eraseblock, the @len argument doesn't have | |
802 | * to be aligned to the minimal I/O unit size. Instead, it has to be equivalent | |
803 | * to the real data size, although the @buf buffer has to contain the | |
804 | * alignment. In all other cases, @len has to be aligned. | |
805 | * | |
025dfdaf | 806 | * It is prohibited to write more than once to logical eraseblocks of static |
801c135c AB |
807 | * volumes. This function returns zero in case of success and a negative error |
808 | * code in case of failure. | |
809 | */ | |
89b96b69 | 810 | int ubi_eba_write_leb_st(struct ubi_device *ubi, struct ubi_volume *vol, |
b36a261e | 811 | int lnum, const void *buf, int len, int used_ebs) |
801c135c | 812 | { |
89b96b69 | 813 | int err, pnum, tries = 0, data_size = len, vol_id = vol->vol_id; |
801c135c AB |
814 | struct ubi_vid_hdr *vid_hdr; |
815 | uint32_t crc; | |
816 | ||
817 | if (ubi->ro_mode) | |
818 | return -EROFS; | |
819 | ||
820 | if (lnum == used_ebs - 1) | |
821 | /* If this is the last LEB @len may be unaligned */ | |
822 | len = ALIGN(data_size, ubi->min_io_size); | |
823 | else | |
cadb40cc | 824 | ubi_assert(!(len & (ubi->min_io_size - 1))); |
801c135c | 825 | |
33818bbb | 826 | vid_hdr = ubi_zalloc_vid_hdr(ubi, GFP_NOFS); |
801c135c AB |
827 | if (!vid_hdr) |
828 | return -ENOMEM; | |
829 | ||
830 | err = leb_write_lock(ubi, vol_id, lnum); | |
831 | if (err) { | |
832 | ubi_free_vid_hdr(ubi, vid_hdr); | |
833 | return err; | |
834 | } | |
835 | ||
a7306653 | 836 | vid_hdr->sqnum = cpu_to_be64(ubi_next_sqnum(ubi)); |
3261ebd7 CH |
837 | vid_hdr->vol_id = cpu_to_be32(vol_id); |
838 | vid_hdr->lnum = cpu_to_be32(lnum); | |
801c135c | 839 | vid_hdr->compat = ubi_get_compat(ubi, vol_id); |
3261ebd7 | 840 | vid_hdr->data_pad = cpu_to_be32(vol->data_pad); |
801c135c AB |
841 | |
842 | crc = crc32(UBI_CRC32_INIT, buf, data_size); | |
843 | vid_hdr->vol_type = UBI_VID_STATIC; | |
3261ebd7 CH |
844 | vid_hdr->data_size = cpu_to_be32(data_size); |
845 | vid_hdr->used_ebs = cpu_to_be32(used_ebs); | |
846 | vid_hdr->data_crc = cpu_to_be32(crc); | |
801c135c AB |
847 | |
848 | retry: | |
b36a261e | 849 | pnum = ubi_wl_get_peb(ubi); |
801c135c AB |
850 | if (pnum < 0) { |
851 | ubi_free_vid_hdr(ubi, vid_hdr); | |
852 | leb_write_unlock(ubi, vol_id, lnum); | |
111ab0b2 | 853 | up_read(&ubi->fm_eba_sem); |
801c135c AB |
854 | return pnum; |
855 | } | |
856 | ||
857 | dbg_eba("write VID hdr and %d bytes at LEB %d:%d, PEB %d, used_ebs %d", | |
858 | len, vol_id, lnum, pnum, used_ebs); | |
859 | ||
860 | err = ubi_io_write_vid_hdr(ubi, pnum, vid_hdr); | |
861 | if (err) { | |
32608703 | 862 | ubi_warn(ubi, "failed to write VID header to LEB %d:%d, PEB %d", |
801c135c | 863 | vol_id, lnum, pnum); |
111ab0b2 | 864 | up_read(&ubi->fm_eba_sem); |
801c135c AB |
865 | goto write_error; |
866 | } | |
867 | ||
868 | err = ubi_io_write_data(ubi, buf, pnum, 0, len); | |
869 | if (err) { | |
32608703 | 870 | ubi_warn(ubi, "failed to write %d bytes of data to PEB %d", |
801c135c | 871 | len, pnum); |
111ab0b2 | 872 | up_read(&ubi->fm_eba_sem); |
801c135c AB |
873 | goto write_error; |
874 | } | |
875 | ||
876 | ubi_assert(vol->eba_tbl[lnum] < 0); | |
877 | vol->eba_tbl[lnum] = pnum; | |
111ab0b2 | 878 | up_read(&ubi->fm_eba_sem); |
801c135c AB |
879 | |
880 | leb_write_unlock(ubi, vol_id, lnum); | |
881 | ubi_free_vid_hdr(ubi, vid_hdr); | |
882 | return 0; | |
883 | ||
884 | write_error: | |
885 | if (err != -EIO || !ubi->bad_allowed) { | |
886 | /* | |
887 | * This flash device does not admit of bad eraseblocks or | |
888 | * something nasty and unexpected happened. Switch to read-only | |
889 | * mode just in case. | |
890 | */ | |
891 | ubi_ro_mode(ubi); | |
892 | leb_write_unlock(ubi, vol_id, lnum); | |
893 | ubi_free_vid_hdr(ubi, vid_hdr); | |
894 | return err; | |
895 | } | |
896 | ||
d36e59e6 | 897 | err = ubi_wl_put_peb(ubi, vol_id, lnum, pnum, 1); |
801c135c AB |
898 | if (err || ++tries > UBI_IO_RETRIES) { |
899 | ubi_ro_mode(ubi); | |
900 | leb_write_unlock(ubi, vol_id, lnum); | |
901 | ubi_free_vid_hdr(ubi, vid_hdr); | |
902 | return err; | |
903 | } | |
904 | ||
a7306653 | 905 | vid_hdr->sqnum = cpu_to_be64(ubi_next_sqnum(ubi)); |
32608703 | 906 | ubi_msg(ubi, "try another PEB"); |
801c135c AB |
907 | goto retry; |
908 | } | |
909 | ||
910 | /* | |
911 | * ubi_eba_atomic_leb_change - change logical eraseblock atomically. | |
912 | * @ubi: UBI device description object | |
c63a491d | 913 | * @vol: volume description object |
801c135c AB |
914 | * @lnum: logical eraseblock number |
915 | * @buf: data to write | |
916 | * @len: how many bytes to write | |
801c135c AB |
917 | * |
918 | * This function changes the contents of a logical eraseblock atomically. @buf | |
919 | * has to contain new logical eraseblock data, and @len - the length of the | |
920 | * data, which has to be aligned. This function guarantees that in case of an | |
921 | * unclean reboot the old contents is preserved. Returns zero in case of | |
922 | * success and a negative error code in case of failure. | |
e8823bd6 AB |
923 | * |
924 | * UBI reserves one LEB for the "atomic LEB change" operation, so only one | |
925 | * LEB change may be done at a time. This is ensured by @ubi->alc_mutex. | |
801c135c | 926 | */ |
89b96b69 | 927 | int ubi_eba_atomic_leb_change(struct ubi_device *ubi, struct ubi_volume *vol, |
b36a261e | 928 | int lnum, const void *buf, int len) |
801c135c | 929 | { |
36a87e44 | 930 | int err, pnum, old_pnum, tries = 0, vol_id = vol->vol_id; |
801c135c AB |
931 | struct ubi_vid_hdr *vid_hdr; |
932 | uint32_t crc; | |
933 | ||
934 | if (ubi->ro_mode) | |
935 | return -EROFS; | |
936 | ||
60c03153 AB |
937 | if (len == 0) { |
938 | /* | |
939 | * Special case when data length is zero. In this case the LEB | |
940 | * has to be unmapped and mapped somewhere else. | |
941 | */ | |
942 | err = ubi_eba_unmap_leb(ubi, vol, lnum); | |
943 | if (err) | |
944 | return err; | |
b36a261e | 945 | return ubi_eba_write_leb(ubi, vol, lnum, NULL, 0, 0); |
60c03153 AB |
946 | } |
947 | ||
33818bbb | 948 | vid_hdr = ubi_zalloc_vid_hdr(ubi, GFP_NOFS); |
801c135c AB |
949 | if (!vid_hdr) |
950 | return -ENOMEM; | |
951 | ||
e8823bd6 | 952 | mutex_lock(&ubi->alc_mutex); |
801c135c | 953 | err = leb_write_lock(ubi, vol_id, lnum); |
e8823bd6 AB |
954 | if (err) |
955 | goto out_mutex; | |
801c135c | 956 | |
a7306653 | 957 | vid_hdr->sqnum = cpu_to_be64(ubi_next_sqnum(ubi)); |
3261ebd7 CH |
958 | vid_hdr->vol_id = cpu_to_be32(vol_id); |
959 | vid_hdr->lnum = cpu_to_be32(lnum); | |
801c135c | 960 | vid_hdr->compat = ubi_get_compat(ubi, vol_id); |
3261ebd7 | 961 | vid_hdr->data_pad = cpu_to_be32(vol->data_pad); |
801c135c AB |
962 | |
963 | crc = crc32(UBI_CRC32_INIT, buf, len); | |
84a92580 | 964 | vid_hdr->vol_type = UBI_VID_DYNAMIC; |
3261ebd7 | 965 | vid_hdr->data_size = cpu_to_be32(len); |
801c135c | 966 | vid_hdr->copy_flag = 1; |
3261ebd7 | 967 | vid_hdr->data_crc = cpu_to_be32(crc); |
801c135c AB |
968 | |
969 | retry: | |
b36a261e | 970 | pnum = ubi_wl_get_peb(ubi); |
801c135c | 971 | if (pnum < 0) { |
e8823bd6 | 972 | err = pnum; |
111ab0b2 | 973 | up_read(&ubi->fm_eba_sem); |
e8823bd6 | 974 | goto out_leb_unlock; |
801c135c AB |
975 | } |
976 | ||
977 | dbg_eba("change LEB %d:%d, PEB %d, write VID hdr to PEB %d", | |
978 | vol_id, lnum, vol->eba_tbl[lnum], pnum); | |
979 | ||
980 | err = ubi_io_write_vid_hdr(ubi, pnum, vid_hdr); | |
981 | if (err) { | |
32608703 | 982 | ubi_warn(ubi, "failed to write VID header to LEB %d:%d, PEB %d", |
801c135c | 983 | vol_id, lnum, pnum); |
111ab0b2 | 984 | up_read(&ubi->fm_eba_sem); |
801c135c AB |
985 | goto write_error; |
986 | } | |
987 | ||
988 | err = ubi_io_write_data(ubi, buf, pnum, 0, len); | |
989 | if (err) { | |
32608703 | 990 | ubi_warn(ubi, "failed to write %d bytes of data to PEB %d", |
801c135c | 991 | len, pnum); |
111ab0b2 | 992 | up_read(&ubi->fm_eba_sem); |
801c135c AB |
993 | goto write_error; |
994 | } | |
995 | ||
36a87e44 | 996 | old_pnum = vol->eba_tbl[lnum]; |
801c135c | 997 | vol->eba_tbl[lnum] = pnum; |
111ab0b2 | 998 | up_read(&ubi->fm_eba_sem); |
e8823bd6 | 999 | |
36a87e44 RW |
1000 | if (old_pnum >= 0) { |
1001 | err = ubi_wl_put_peb(ubi, vol_id, lnum, old_pnum, 0); | |
1002 | if (err) | |
1003 | goto out_leb_unlock; | |
1004 | } | |
1005 | ||
e8823bd6 | 1006 | out_leb_unlock: |
801c135c | 1007 | leb_write_unlock(ubi, vol_id, lnum); |
e8823bd6 AB |
1008 | out_mutex: |
1009 | mutex_unlock(&ubi->alc_mutex); | |
801c135c | 1010 | ubi_free_vid_hdr(ubi, vid_hdr); |
e8823bd6 | 1011 | return err; |
801c135c AB |
1012 | |
1013 | write_error: | |
1014 | if (err != -EIO || !ubi->bad_allowed) { | |
1015 | /* | |
1016 | * This flash device does not admit of bad eraseblocks or | |
1017 | * something nasty and unexpected happened. Switch to read-only | |
1018 | * mode just in case. | |
1019 | */ | |
1020 | ubi_ro_mode(ubi); | |
e8823bd6 | 1021 | goto out_leb_unlock; |
801c135c AB |
1022 | } |
1023 | ||
d36e59e6 | 1024 | err = ubi_wl_put_peb(ubi, vol_id, lnum, pnum, 1); |
801c135c AB |
1025 | if (err || ++tries > UBI_IO_RETRIES) { |
1026 | ubi_ro_mode(ubi); | |
e8823bd6 | 1027 | goto out_leb_unlock; |
801c135c AB |
1028 | } |
1029 | ||
a7306653 | 1030 | vid_hdr->sqnum = cpu_to_be64(ubi_next_sqnum(ubi)); |
32608703 | 1031 | ubi_msg(ubi, "try another PEB"); |
801c135c AB |
1032 | goto retry; |
1033 | } | |
1034 | ||
6b5c94c6 AB |
1035 | /** |
1036 | * is_error_sane - check whether a read error is sane. | |
1037 | * @err: code of the error happened during reading | |
1038 | * | |
1039 | * This is a helper function for 'ubi_eba_copy_leb()' which is called when we | |
1040 | * cannot read data from the target PEB (an error @err happened). If the error | |
1041 | * code is sane, then we treat this error as non-fatal. Otherwise the error is | |
1042 | * fatal and UBI will be switched to R/O mode later. | |
1043 | * | |
1044 | * The idea is that we try not to switch to R/O mode if the read error is | |
1045 | * something which suggests there was a real read problem. E.g., %-EIO. Or a | |
1046 | * memory allocation failed (-%ENOMEM). Otherwise, it is safer to switch to R/O | |
1047 | * mode, simply because we do not know what happened at the MTD level, and we | |
1048 | * cannot handle this. E.g., the underlying driver may have become crazy, and | |
1049 | * it is safer to switch to R/O mode to preserve the data. | |
1050 | * | |
1051 | * And bear in mind, this is about reading from the target PEB, i.e. the PEB | |
1052 | * which we have just written. | |
1053 | */ | |
1054 | static int is_error_sane(int err) | |
1055 | { | |
786d7831 | 1056 | if (err == -EIO || err == -ENOMEM || err == UBI_IO_BAD_HDR || |
756e1df1 | 1057 | err == UBI_IO_BAD_HDR_EBADMSG || err == -ETIMEDOUT) |
6b5c94c6 AB |
1058 | return 0; |
1059 | return 1; | |
1060 | } | |
1061 | ||
801c135c AB |
1062 | /** |
1063 | * ubi_eba_copy_leb - copy logical eraseblock. | |
1064 | * @ubi: UBI device description object | |
1065 | * @from: physical eraseblock number from where to copy | |
1066 | * @to: physical eraseblock number where to copy | |
1067 | * @vid_hdr: VID header of the @from physical eraseblock | |
1068 | * | |
1069 | * This function copies logical eraseblock from physical eraseblock @from to | |
1070 | * physical eraseblock @to. The @vid_hdr buffer may be changed by this | |
43f9b25a | 1071 | * function. Returns: |
6fa6f5bb | 1072 | * o %0 in case of success; |
cc831464 | 1073 | * o %MOVE_CANCEL_RACE, %MOVE_TARGET_WR_ERR, %MOVE_TARGET_BITFLIPS, etc; |
6fa6f5bb | 1074 | * o a negative error code in case of failure. |
801c135c AB |
1075 | */ |
1076 | int ubi_eba_copy_leb(struct ubi_device *ubi, int from, int to, | |
1077 | struct ubi_vid_hdr *vid_hdr) | |
1078 | { | |
43f9b25a | 1079 | int err, vol_id, lnum, data_size, aldata_size, idx; |
801c135c AB |
1080 | struct ubi_volume *vol; |
1081 | uint32_t crc; | |
801c135c | 1082 | |
3261ebd7 CH |
1083 | vol_id = be32_to_cpu(vid_hdr->vol_id); |
1084 | lnum = be32_to_cpu(vid_hdr->lnum); | |
801c135c | 1085 | |
87960c0b | 1086 | dbg_wl("copy LEB %d:%d, PEB %d to PEB %d", vol_id, lnum, from, to); |
801c135c AB |
1087 | |
1088 | if (vid_hdr->vol_type == UBI_VID_STATIC) { | |
3261ebd7 | 1089 | data_size = be32_to_cpu(vid_hdr->data_size); |
801c135c AB |
1090 | aldata_size = ALIGN(data_size, ubi->min_io_size); |
1091 | } else | |
1092 | data_size = aldata_size = | |
3261ebd7 | 1093 | ubi->leb_size - be32_to_cpu(vid_hdr->data_pad); |
801c135c | 1094 | |
801c135c | 1095 | idx = vol_id2idx(ubi, vol_id); |
43f9b25a | 1096 | spin_lock(&ubi->volumes_lock); |
801c135c | 1097 | /* |
43f9b25a AB |
1098 | * Note, we may race with volume deletion, which means that the volume |
1099 | * this logical eraseblock belongs to might be being deleted. Since the | |
6fa6f5bb | 1100 | * volume deletion un-maps all the volume's logical eraseblocks, it will |
43f9b25a | 1101 | * be locked in 'ubi_wl_put_peb()' and wait for the WL worker to finish. |
801c135c | 1102 | */ |
801c135c | 1103 | vol = ubi->volumes[idx]; |
90bf0265 | 1104 | spin_unlock(&ubi->volumes_lock); |
801c135c | 1105 | if (!vol) { |
43f9b25a | 1106 | /* No need to do further work, cancel */ |
87960c0b | 1107 | dbg_wl("volume %d is being removed, cancel", vol_id); |
90bf0265 | 1108 | return MOVE_CANCEL_RACE; |
801c135c AB |
1109 | } |
1110 | ||
43f9b25a AB |
1111 | /* |
1112 | * We do not want anybody to write to this logical eraseblock while we | |
1113 | * are moving it, so lock it. | |
1114 | * | |
1115 | * Note, we are using non-waiting locking here, because we cannot sleep | |
1116 | * on the LEB, since it may cause deadlocks. Indeed, imagine a task is | |
1117 | * unmapping the LEB which is mapped to the PEB we are going to move | |
1118 | * (@from). This task locks the LEB and goes sleep in the | |
1119 | * 'ubi_wl_put_peb()' function on the @ubi->move_mutex. In turn, we are | |
1120 | * holding @ubi->move_mutex and go sleep on the LEB lock. So, if the | |
90bf0265 | 1121 | * LEB is already locked, we just do not move it and return |
e801e128 BP |
1122 | * %MOVE_RETRY. Note, we do not return %MOVE_CANCEL_RACE here because |
1123 | * we do not know the reasons of the contention - it may be just a | |
1124 | * normal I/O on this LEB, so we want to re-try. | |
43f9b25a AB |
1125 | */ |
1126 | err = leb_write_trylock(ubi, vol_id, lnum); | |
1127 | if (err) { | |
87960c0b | 1128 | dbg_wl("contention on LEB %d:%d, cancel", vol_id, lnum); |
e801e128 | 1129 | return MOVE_RETRY; |
801c135c | 1130 | } |
801c135c | 1131 | |
43f9b25a AB |
1132 | /* |
1133 | * The LEB might have been put meanwhile, and the task which put it is | |
1134 | * probably waiting on @ubi->move_mutex. No need to continue the work, | |
1135 | * cancel it. | |
1136 | */ | |
1137 | if (vol->eba_tbl[lnum] != from) { | |
049333ce AB |
1138 | dbg_wl("LEB %d:%d is no longer mapped to PEB %d, mapped to PEB %d, cancel", |
1139 | vol_id, lnum, from, vol->eba_tbl[lnum]); | |
90bf0265 | 1140 | err = MOVE_CANCEL_RACE; |
43f9b25a AB |
1141 | goto out_unlock_leb; |
1142 | } | |
801c135c | 1143 | |
43f9b25a | 1144 | /* |
b77bcb07 | 1145 | * OK, now the LEB is locked and we can safely start moving it. Since |
0ca39d74 | 1146 | * this function utilizes the @ubi->peb_buf buffer which is shared |
90bf0265 | 1147 | * with some other functions - we lock the buffer by taking the |
43f9b25a AB |
1148 | * @ubi->buf_mutex. |
1149 | */ | |
1150 | mutex_lock(&ubi->buf_mutex); | |
87960c0b | 1151 | dbg_wl("read %d bytes of data", aldata_size); |
0ca39d74 | 1152 | err = ubi_io_read_data(ubi, ubi->peb_buf, from, 0, aldata_size); |
801c135c | 1153 | if (err && err != UBI_IO_BITFLIPS) { |
32608703 | 1154 | ubi_warn(ubi, "error %d while reading data from PEB %d", |
801c135c | 1155 | err, from); |
6b5c94c6 | 1156 | err = MOVE_SOURCE_RD_ERR; |
43f9b25a | 1157 | goto out_unlock_buf; |
801c135c AB |
1158 | } |
1159 | ||
1160 | /* | |
fd589a8f | 1161 | * Now we have got to calculate how much data we have to copy. In |
801c135c AB |
1162 | * case of a static volume it is fairly easy - the VID header contains |
1163 | * the data size. In case of a dynamic volume it is more difficult - we | |
1164 | * have to read the contents, cut 0xFF bytes from the end and copy only | |
1165 | * the first part. We must do this to avoid writing 0xFF bytes as it | |
1166 | * may have some side-effects. And not only this. It is important not | |
1167 | * to include those 0xFFs to CRC because later the they may be filled | |
1168 | * by data. | |
1169 | */ | |
1170 | if (vid_hdr->vol_type == UBI_VID_DYNAMIC) | |
1171 | aldata_size = data_size = | |
0ca39d74 | 1172 | ubi_calc_data_len(ubi, ubi->peb_buf, data_size); |
801c135c AB |
1173 | |
1174 | cond_resched(); | |
0ca39d74 | 1175 | crc = crc32(UBI_CRC32_INIT, ubi->peb_buf, data_size); |
801c135c AB |
1176 | cond_resched(); |
1177 | ||
1178 | /* | |
90bf0265 | 1179 | * It may turn out to be that the whole @from physical eraseblock |
801c135c AB |
1180 | * contains only 0xFF bytes. Then we have to only write the VID header |
1181 | * and do not write any data. This also means we should not set | |
1182 | * @vid_hdr->copy_flag, @vid_hdr->data_size, and @vid_hdr->data_crc. | |
1183 | */ | |
1184 | if (data_size > 0) { | |
1185 | vid_hdr->copy_flag = 1; | |
3261ebd7 CH |
1186 | vid_hdr->data_size = cpu_to_be32(data_size); |
1187 | vid_hdr->data_crc = cpu_to_be32(crc); | |
801c135c | 1188 | } |
a7306653 | 1189 | vid_hdr->sqnum = cpu_to_be64(ubi_next_sqnum(ubi)); |
801c135c AB |
1190 | |
1191 | err = ubi_io_write_vid_hdr(ubi, to, vid_hdr); | |
6fa6f5bb AB |
1192 | if (err) { |
1193 | if (err == -EIO) | |
90bf0265 | 1194 | err = MOVE_TARGET_WR_ERR; |
43f9b25a | 1195 | goto out_unlock_buf; |
6fa6f5bb | 1196 | } |
801c135c AB |
1197 | |
1198 | cond_resched(); | |
1199 | ||
1200 | /* Read the VID header back and check if it was written correctly */ | |
1201 | err = ubi_io_read_vid_hdr(ubi, to, vid_hdr, 1); | |
1202 | if (err) { | |
b86a2c56 | 1203 | if (err != UBI_IO_BITFLIPS) { |
32608703 | 1204 | ubi_warn(ubi, "error %d while reading VID header back from PEB %d", |
049333ce | 1205 | err, to); |
6b5c94c6 | 1206 | if (is_error_sane(err)) |
b86a2c56 AB |
1207 | err = MOVE_TARGET_RD_ERR; |
1208 | } else | |
cc831464 | 1209 | err = MOVE_TARGET_BITFLIPS; |
43f9b25a | 1210 | goto out_unlock_buf; |
801c135c AB |
1211 | } |
1212 | ||
1213 | if (data_size > 0) { | |
0ca39d74 | 1214 | err = ubi_io_write_data(ubi, ubi->peb_buf, to, 0, aldata_size); |
6fa6f5bb AB |
1215 | if (err) { |
1216 | if (err == -EIO) | |
90bf0265 | 1217 | err = MOVE_TARGET_WR_ERR; |
43f9b25a | 1218 | goto out_unlock_buf; |
6fa6f5bb | 1219 | } |
801c135c | 1220 | |
e88d6e10 | 1221 | cond_resched(); |
801c135c AB |
1222 | } |
1223 | ||
1224 | ubi_assert(vol->eba_tbl[lnum] == from); | |
111ab0b2 | 1225 | down_read(&ubi->fm_eba_sem); |
801c135c | 1226 | vol->eba_tbl[lnum] = to; |
111ab0b2 | 1227 | up_read(&ubi->fm_eba_sem); |
801c135c | 1228 | |
43f9b25a | 1229 | out_unlock_buf: |
e88d6e10 | 1230 | mutex_unlock(&ubi->buf_mutex); |
43f9b25a | 1231 | out_unlock_leb: |
801c135c | 1232 | leb_write_unlock(ubi, vol_id, lnum); |
801c135c AB |
1233 | return err; |
1234 | } | |
1235 | ||
64d4b4c9 AB |
1236 | /** |
1237 | * print_rsvd_warning - warn about not having enough reserved PEBs. | |
1238 | * @ubi: UBI device description object | |
1239 | * | |
41e0cd9d | 1240 | * This is a helper function for 'ubi_eba_init()' which is called when UBI |
64d4b4c9 AB |
1241 | * cannot reserve enough PEBs for bad block handling. This function makes a |
1242 | * decision whether we have to print a warning or not. The algorithm is as | |
1243 | * follows: | |
1244 | * o if this is a new UBI image, then just print the warning | |
1245 | * o if this is an UBI image which has already been used for some time, print | |
1246 | * a warning only if we can reserve less than 10% of the expected amount of | |
1247 | * the reserved PEB. | |
1248 | * | |
1249 | * The idea is that when UBI is used, PEBs become bad, and the reserved pool | |
1250 | * of PEBs becomes smaller, which is normal and we do not want to scare users | |
1251 | * with a warning every time they attach the MTD device. This was an issue | |
1252 | * reported by real users. | |
1253 | */ | |
1254 | static void print_rsvd_warning(struct ubi_device *ubi, | |
a4e6042f | 1255 | struct ubi_attach_info *ai) |
64d4b4c9 AB |
1256 | { |
1257 | /* | |
1258 | * The 1 << 18 (256KiB) number is picked randomly, just a reasonably | |
1259 | * large number to distinguish between newly flashed and used images. | |
1260 | */ | |
a4e6042f | 1261 | if (ai->max_sqnum > (1 << 18)) { |
64d4b4c9 AB |
1262 | int min = ubi->beb_rsvd_level / 10; |
1263 | ||
1264 | if (!min) | |
1265 | min = 1; | |
1266 | if (ubi->beb_rsvd_pebs > min) | |
1267 | return; | |
1268 | } | |
1269 | ||
32608703 | 1270 | ubi_warn(ubi, "cannot reserve enough PEBs for bad PEB handling, reserved %d, need %d", |
049333ce | 1271 | ubi->beb_rsvd_pebs, ubi->beb_rsvd_level); |
5fc01ab6 | 1272 | if (ubi->corr_peb_count) |
32608703 | 1273 | ubi_warn(ubi, "%d PEBs are corrupted and not used", |
049333ce | 1274 | ubi->corr_peb_count); |
64d4b4c9 AB |
1275 | } |
1276 | ||
00abf304 RW |
1277 | /** |
1278 | * self_check_eba - run a self check on the EBA table constructed by fastmap. | |
1279 | * @ubi: UBI device description object | |
1280 | * @ai_fastmap: UBI attach info object created by fastmap | |
1281 | * @ai_scan: UBI attach info object created by scanning | |
1282 | * | |
1283 | * Returns < 0 in case of an internal error, 0 otherwise. | |
1284 | * If a bad EBA table entry was found it will be printed out and | |
1285 | * ubi_assert() triggers. | |
1286 | */ | |
1287 | int self_check_eba(struct ubi_device *ubi, struct ubi_attach_info *ai_fastmap, | |
1288 | struct ubi_attach_info *ai_scan) | |
1289 | { | |
1290 | int i, j, num_volumes, ret = 0; | |
1291 | int **scan_eba, **fm_eba; | |
1292 | struct ubi_ainf_volume *av; | |
1293 | struct ubi_volume *vol; | |
1294 | struct ubi_ainf_peb *aeb; | |
1295 | struct rb_node *rb; | |
1296 | ||
1297 | num_volumes = ubi->vtbl_slots + UBI_INT_VOL_COUNT; | |
1298 | ||
1299 | scan_eba = kmalloc(sizeof(*scan_eba) * num_volumes, GFP_KERNEL); | |
1300 | if (!scan_eba) | |
1301 | return -ENOMEM; | |
1302 | ||
1303 | fm_eba = kmalloc(sizeof(*fm_eba) * num_volumes, GFP_KERNEL); | |
1304 | if (!fm_eba) { | |
1305 | kfree(scan_eba); | |
1306 | return -ENOMEM; | |
1307 | } | |
1308 | ||
1309 | for (i = 0; i < num_volumes; i++) { | |
1310 | vol = ubi->volumes[i]; | |
1311 | if (!vol) | |
1312 | continue; | |
1313 | ||
1314 | scan_eba[i] = kmalloc(vol->reserved_pebs * sizeof(**scan_eba), | |
1315 | GFP_KERNEL); | |
1316 | if (!scan_eba[i]) { | |
1317 | ret = -ENOMEM; | |
1318 | goto out_free; | |
1319 | } | |
1320 | ||
1321 | fm_eba[i] = kmalloc(vol->reserved_pebs * sizeof(**fm_eba), | |
1322 | GFP_KERNEL); | |
1323 | if (!fm_eba[i]) { | |
1324 | ret = -ENOMEM; | |
1325 | goto out_free; | |
1326 | } | |
1327 | ||
1328 | for (j = 0; j < vol->reserved_pebs; j++) | |
1329 | scan_eba[i][j] = fm_eba[i][j] = UBI_LEB_UNMAPPED; | |
1330 | ||
1331 | av = ubi_find_av(ai_scan, idx2vol_id(ubi, i)); | |
1332 | if (!av) | |
1333 | continue; | |
1334 | ||
1335 | ubi_rb_for_each_entry(rb, aeb, &av->root, u.rb) | |
1336 | scan_eba[i][aeb->lnum] = aeb->pnum; | |
1337 | ||
1338 | av = ubi_find_av(ai_fastmap, idx2vol_id(ubi, i)); | |
1339 | if (!av) | |
1340 | continue; | |
1341 | ||
1342 | ubi_rb_for_each_entry(rb, aeb, &av->root, u.rb) | |
1343 | fm_eba[i][aeb->lnum] = aeb->pnum; | |
1344 | ||
1345 | for (j = 0; j < vol->reserved_pebs; j++) { | |
1346 | if (scan_eba[i][j] != fm_eba[i][j]) { | |
1347 | if (scan_eba[i][j] == UBI_LEB_UNMAPPED || | |
1348 | fm_eba[i][j] == UBI_LEB_UNMAPPED) | |
1349 | continue; | |
1350 | ||
32608703 | 1351 | ubi_err(ubi, "LEB:%i:%i is PEB:%i instead of %i!", |
5347417e | 1352 | vol->vol_id, j, fm_eba[i][j], |
00abf304 RW |
1353 | scan_eba[i][j]); |
1354 | ubi_assert(0); | |
1355 | } | |
1356 | } | |
1357 | } | |
1358 | ||
1359 | out_free: | |
1360 | for (i = 0; i < num_volumes; i++) { | |
1361 | if (!ubi->volumes[i]) | |
1362 | continue; | |
1363 | ||
1364 | kfree(scan_eba[i]); | |
1365 | kfree(fm_eba[i]); | |
1366 | } | |
1367 | ||
1368 | kfree(scan_eba); | |
1369 | kfree(fm_eba); | |
1370 | return ret; | |
1371 | } | |
1372 | ||
801c135c | 1373 | /** |
41e0cd9d | 1374 | * ubi_eba_init - initialize the EBA sub-system using attaching information. |
801c135c | 1375 | * @ubi: UBI device description object |
a4e6042f | 1376 | * @ai: attaching information |
801c135c AB |
1377 | * |
1378 | * This function returns zero in case of success and a negative error code in | |
1379 | * case of failure. | |
1380 | */ | |
41e0cd9d | 1381 | int ubi_eba_init(struct ubi_device *ubi, struct ubi_attach_info *ai) |
801c135c AB |
1382 | { |
1383 | int i, j, err, num_volumes; | |
517af48c | 1384 | struct ubi_ainf_volume *av; |
801c135c | 1385 | struct ubi_volume *vol; |
2c5ec5ce | 1386 | struct ubi_ainf_peb *aeb; |
801c135c AB |
1387 | struct rb_node *rb; |
1388 | ||
85c6e6e2 | 1389 | dbg_eba("initialize EBA sub-system"); |
801c135c AB |
1390 | |
1391 | spin_lock_init(&ubi->ltree_lock); | |
e8823bd6 | 1392 | mutex_init(&ubi->alc_mutex); |
801c135c AB |
1393 | ubi->ltree = RB_ROOT; |
1394 | ||
a4e6042f | 1395 | ubi->global_sqnum = ai->max_sqnum + 1; |
801c135c AB |
1396 | num_volumes = ubi->vtbl_slots + UBI_INT_VOL_COUNT; |
1397 | ||
1398 | for (i = 0; i < num_volumes; i++) { | |
1399 | vol = ubi->volumes[i]; | |
1400 | if (!vol) | |
1401 | continue; | |
1402 | ||
1403 | cond_resched(); | |
1404 | ||
1405 | vol->eba_tbl = kmalloc(vol->reserved_pebs * sizeof(int), | |
1406 | GFP_KERNEL); | |
1407 | if (!vol->eba_tbl) { | |
1408 | err = -ENOMEM; | |
1409 | goto out_free; | |
1410 | } | |
1411 | ||
1412 | for (j = 0; j < vol->reserved_pebs; j++) | |
1413 | vol->eba_tbl[j] = UBI_LEB_UNMAPPED; | |
1414 | ||
dcd85fdd | 1415 | av = ubi_find_av(ai, idx2vol_id(ubi, i)); |
517af48c | 1416 | if (!av) |
801c135c AB |
1417 | continue; |
1418 | ||
517af48c | 1419 | ubi_rb_for_each_entry(rb, aeb, &av->root, u.rb) { |
2c5ec5ce | 1420 | if (aeb->lnum >= vol->reserved_pebs) |
801c135c AB |
1421 | /* |
1422 | * This may happen in case of an unclean reboot | |
1423 | * during re-size. | |
1424 | */ | |
0bae2887 | 1425 | ubi_move_aeb_to_list(av, aeb, &ai->erase); |
d74adbdb BN |
1426 | else |
1427 | vol->eba_tbl[aeb->lnum] = aeb->pnum; | |
801c135c AB |
1428 | } |
1429 | } | |
1430 | ||
94780d4d | 1431 | if (ubi->avail_pebs < EBA_RESERVED_PEBS) { |
32608703 | 1432 | ubi_err(ubi, "no enough physical eraseblocks (%d, need %d)", |
94780d4d | 1433 | ubi->avail_pebs, EBA_RESERVED_PEBS); |
5fc01ab6 | 1434 | if (ubi->corr_peb_count) |
32608703 | 1435 | ubi_err(ubi, "%d PEBs are corrupted and not used", |
5fc01ab6 | 1436 | ubi->corr_peb_count); |
94780d4d AB |
1437 | err = -ENOSPC; |
1438 | goto out_free; | |
1439 | } | |
1440 | ubi->avail_pebs -= EBA_RESERVED_PEBS; | |
1441 | ubi->rsvd_pebs += EBA_RESERVED_PEBS; | |
1442 | ||
801c135c AB |
1443 | if (ubi->bad_allowed) { |
1444 | ubi_calculate_reserved(ubi); | |
1445 | ||
1446 | if (ubi->avail_pebs < ubi->beb_rsvd_level) { | |
1447 | /* No enough free physical eraseblocks */ | |
1448 | ubi->beb_rsvd_pebs = ubi->avail_pebs; | |
a4e6042f | 1449 | print_rsvd_warning(ubi, ai); |
801c135c AB |
1450 | } else |
1451 | ubi->beb_rsvd_pebs = ubi->beb_rsvd_level; | |
1452 | ||
1453 | ubi->avail_pebs -= ubi->beb_rsvd_pebs; | |
1454 | ubi->rsvd_pebs += ubi->beb_rsvd_pebs; | |
1455 | } | |
1456 | ||
85c6e6e2 | 1457 | dbg_eba("EBA sub-system is initialized"); |
801c135c AB |
1458 | return 0; |
1459 | ||
1460 | out_free: | |
1461 | for (i = 0; i < num_volumes; i++) { | |
1462 | if (!ubi->volumes[i]) | |
1463 | continue; | |
1464 | kfree(ubi->volumes[i]->eba_tbl); | |
7194e6f9 | 1465 | ubi->volumes[i]->eba_tbl = NULL; |
801c135c | 1466 | } |
801c135c AB |
1467 | return err; |
1468 | } |