Commit | Line | Data |
---|---|---|
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 | /* | |
22 | * The UBI Eraseblock Association (EBA) unit. | |
23 | * | |
24 | * This unit is responsible for I/O to/from logical eraseblock. | |
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 | * | |
30 | * The EBA unit implements per-logical eraseblock locking. Before accessing a | |
31 | * logical eraseblock it is locked for reading or writing. The per-logical | |
32 | * eraseblock locking is implemented by means of the lock tree. The lock tree | |
33 | * is an RB-tree which refers all the currently locked logical eraseblocks. The | |
3a8d4642 | 34 | * lock tree elements are &struct ubi_ltree_entry objects. They are indexed by |
801c135c AB |
35 | * (@vol_id, @lnum) pairs. |
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 | */ | |
60 | static unsigned long long next_sqnum(struct ubi_device *ubi) | |
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 | { | |
81 | if (vol_id == UBI_LAYOUT_VOL_ID) | |
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 | |
3a8d4642 | 140 | le = kmem_cache_alloc(ubi_ltree_slab, GFP_NOFS); |
801c135c AB |
141 | if (!le) |
142 | return ERR_PTR(-ENOMEM); | |
143 | ||
144 | le->vol_id = vol_id; | |
145 | le->lnum = lnum; | |
146 | ||
147 | spin_lock(&ubi->ltree_lock); | |
148 | le1 = ltree_lookup(ubi, vol_id, lnum); | |
149 | ||
150 | if (le1) { | |
151 | /* | |
152 | * This logical eraseblock is already locked. The newly | |
153 | * allocated lock entry is not needed. | |
154 | */ | |
155 | le_free = le; | |
156 | le = le1; | |
157 | } else { | |
158 | struct rb_node **p, *parent = NULL; | |
159 | ||
160 | /* | |
161 | * No lock entry, add the newly allocated one to the | |
162 | * @ubi->ltree RB-tree. | |
163 | */ | |
164 | le_free = NULL; | |
165 | ||
166 | p = &ubi->ltree.rb_node; | |
167 | while (*p) { | |
168 | parent = *p; | |
3a8d4642 | 169 | le1 = rb_entry(parent, struct ubi_ltree_entry, rb); |
801c135c AB |
170 | |
171 | if (vol_id < le1->vol_id) | |
172 | p = &(*p)->rb_left; | |
173 | else if (vol_id > le1->vol_id) | |
174 | p = &(*p)->rb_right; | |
175 | else { | |
176 | ubi_assert(lnum != le1->lnum); | |
177 | if (lnum < le1->lnum) | |
178 | p = &(*p)->rb_left; | |
179 | else | |
180 | p = &(*p)->rb_right; | |
181 | } | |
182 | } | |
183 | ||
184 | rb_link_node(&le->rb, parent, p); | |
185 | rb_insert_color(&le->rb, &ubi->ltree); | |
186 | } | |
187 | le->users += 1; | |
188 | spin_unlock(&ubi->ltree_lock); | |
189 | ||
190 | if (le_free) | |
3a8d4642 | 191 | kmem_cache_free(ubi_ltree_slab, le_free); |
801c135c AB |
192 | |
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 | { | |
224 | int free = 0; | |
3a8d4642 | 225 | struct ubi_ltree_entry *le; |
801c135c AB |
226 | |
227 | spin_lock(&ubi->ltree_lock); | |
228 | le = ltree_lookup(ubi, vol_id, lnum); | |
229 | le->users -= 1; | |
230 | ubi_assert(le->users >= 0); | |
231 | if (le->users == 0) { | |
232 | rb_erase(&le->rb, &ubi->ltree); | |
233 | free = 1; | |
234 | } | |
235 | spin_unlock(&ubi->ltree_lock); | |
236 | ||
237 | up_read(&le->mutex); | |
238 | if (free) | |
3a8d4642 | 239 | kmem_cache_free(ubi_ltree_slab, le); |
801c135c AB |
240 | } |
241 | ||
242 | /** | |
243 | * leb_write_lock - lock logical eraseblock for writing. | |
244 | * @ubi: UBI device description object | |
245 | * @vol_id: volume ID | |
246 | * @lnum: logical eraseblock number | |
247 | * | |
248 | * This function locks a logical eraseblock for writing. Returns zero in case | |
249 | * of success and a negative error code in case of failure. | |
250 | */ | |
251 | static int leb_write_lock(struct ubi_device *ubi, int vol_id, int lnum) | |
252 | { | |
3a8d4642 | 253 | struct ubi_ltree_entry *le; |
801c135c AB |
254 | |
255 | le = ltree_add_entry(ubi, vol_id, lnum); | |
256 | if (IS_ERR(le)) | |
257 | return PTR_ERR(le); | |
258 | down_write(&le->mutex); | |
259 | return 0; | |
260 | } | |
261 | ||
43f9b25a AB |
262 | /** |
263 | * leb_write_lock - lock logical eraseblock for writing. | |
264 | * @ubi: UBI device description object | |
265 | * @vol_id: volume ID | |
266 | * @lnum: logical eraseblock number | |
267 | * | |
268 | * This function locks a logical eraseblock for writing if there is no | |
269 | * contention and does nothing if there is contention. Returns %0 in case of | |
270 | * success, %1 in case of contention, and and a negative error code in case of | |
271 | * failure. | |
272 | */ | |
273 | static int leb_write_trylock(struct ubi_device *ubi, int vol_id, int lnum) | |
274 | { | |
275 | int free; | |
276 | struct ubi_ltree_entry *le; | |
277 | ||
278 | le = ltree_add_entry(ubi, vol_id, lnum); | |
279 | if (IS_ERR(le)) | |
280 | return PTR_ERR(le); | |
281 | if (down_write_trylock(&le->mutex)) | |
282 | return 0; | |
283 | ||
284 | /* Contention, cancel */ | |
285 | spin_lock(&ubi->ltree_lock); | |
286 | le->users -= 1; | |
287 | ubi_assert(le->users >= 0); | |
288 | if (le->users == 0) { | |
289 | rb_erase(&le->rb, &ubi->ltree); | |
290 | free = 1; | |
291 | } else | |
292 | free = 0; | |
293 | spin_unlock(&ubi->ltree_lock); | |
294 | if (free) | |
295 | kmem_cache_free(ubi_ltree_slab, le); | |
296 | ||
297 | return 1; | |
298 | } | |
299 | ||
801c135c AB |
300 | /** |
301 | * leb_write_unlock - unlock logical eraseblock. | |
302 | * @ubi: UBI device description object | |
303 | * @vol_id: volume ID | |
304 | * @lnum: logical eraseblock number | |
305 | */ | |
306 | static void leb_write_unlock(struct ubi_device *ubi, int vol_id, int lnum) | |
307 | { | |
308 | int free; | |
3a8d4642 | 309 | struct ubi_ltree_entry *le; |
801c135c AB |
310 | |
311 | spin_lock(&ubi->ltree_lock); | |
312 | le = ltree_lookup(ubi, vol_id, lnum); | |
313 | le->users -= 1; | |
314 | ubi_assert(le->users >= 0); | |
315 | if (le->users == 0) { | |
316 | rb_erase(&le->rb, &ubi->ltree); | |
317 | free = 1; | |
318 | } else | |
319 | free = 0; | |
320 | spin_unlock(&ubi->ltree_lock); | |
321 | ||
322 | up_write(&le->mutex); | |
323 | if (free) | |
3a8d4642 | 324 | kmem_cache_free(ubi_ltree_slab, le); |
801c135c AB |
325 | } |
326 | ||
327 | /** | |
328 | * ubi_eba_unmap_leb - un-map logical eraseblock. | |
329 | * @ubi: UBI device description object | |
89b96b69 | 330 | * @vol: volume description object |
801c135c AB |
331 | * @lnum: logical eraseblock number |
332 | * | |
333 | * This function un-maps logical eraseblock @lnum and schedules corresponding | |
334 | * physical eraseblock for erasure. Returns zero in case of success and a | |
335 | * negative error code in case of failure. | |
336 | */ | |
89b96b69 AB |
337 | int ubi_eba_unmap_leb(struct ubi_device *ubi, struct ubi_volume *vol, |
338 | int lnum) | |
801c135c | 339 | { |
89b96b69 | 340 | int err, pnum, vol_id = vol->vol_id; |
801c135c | 341 | |
d05c77a8 AB |
342 | ubi_assert(vol->ref_count > 0); |
343 | ||
801c135c AB |
344 | if (ubi->ro_mode) |
345 | return -EROFS; | |
346 | ||
347 | err = leb_write_lock(ubi, vol_id, lnum); | |
348 | if (err) | |
349 | return err; | |
350 | ||
351 | pnum = vol->eba_tbl[lnum]; | |
352 | if (pnum < 0) | |
353 | /* This logical eraseblock is already unmapped */ | |
354 | goto out_unlock; | |
355 | ||
356 | dbg_eba("erase LEB %d:%d, PEB %d", vol_id, lnum, pnum); | |
357 | ||
358 | vol->eba_tbl[lnum] = UBI_LEB_UNMAPPED; | |
359 | err = ubi_wl_put_peb(ubi, pnum, 0); | |
360 | ||
361 | out_unlock: | |
362 | leb_write_unlock(ubi, vol_id, lnum); | |
363 | return err; | |
364 | } | |
365 | ||
366 | /** | |
367 | * ubi_eba_read_leb - read data. | |
368 | * @ubi: UBI device description object | |
89b96b69 | 369 | * @vol: volume description object |
801c135c AB |
370 | * @lnum: logical eraseblock number |
371 | * @buf: buffer to store the read data | |
372 | * @offset: offset from where to read | |
373 | * @len: how many bytes to read | |
374 | * @check: data CRC check flag | |
375 | * | |
376 | * If the logical eraseblock @lnum is unmapped, @buf is filled with 0xFF | |
377 | * bytes. The @check flag only makes sense for static volumes and forces | |
378 | * eraseblock data CRC checking. | |
379 | * | |
380 | * In case of success this function returns zero. In case of a static volume, | |
381 | * if data CRC mismatches - %-EBADMSG is returned. %-EBADMSG may also be | |
382 | * returned for any volume type if an ECC error was detected by the MTD device | |
383 | * driver. Other negative error cored may be returned in case of other errors. | |
384 | */ | |
89b96b69 AB |
385 | int ubi_eba_read_leb(struct ubi_device *ubi, struct ubi_volume *vol, int lnum, |
386 | void *buf, int offset, int len, int check) | |
801c135c | 387 | { |
89b96b69 | 388 | int err, pnum, scrub = 0, vol_id = vol->vol_id; |
801c135c | 389 | struct ubi_vid_hdr *vid_hdr; |
a6343afb | 390 | uint32_t uninitialized_var(crc); |
801c135c | 391 | |
d05c77a8 AB |
392 | ubi_assert(vol->ref_count > 0); |
393 | ||
801c135c AB |
394 | err = leb_read_lock(ubi, vol_id, lnum); |
395 | if (err) | |
396 | return err; | |
397 | ||
398 | pnum = vol->eba_tbl[lnum]; | |
399 | if (pnum < 0) { | |
400 | /* | |
401 | * The logical eraseblock is not mapped, fill the whole buffer | |
402 | * with 0xFF bytes. The exception is static volumes for which | |
403 | * it is an error to read unmapped logical eraseblocks. | |
404 | */ | |
405 | dbg_eba("read %d bytes from offset %d of LEB %d:%d (unmapped)", | |
406 | len, offset, vol_id, lnum); | |
407 | leb_read_unlock(ubi, vol_id, lnum); | |
408 | ubi_assert(vol->vol_type != UBI_STATIC_VOLUME); | |
409 | memset(buf, 0xFF, len); | |
410 | return 0; | |
411 | } | |
412 | ||
413 | dbg_eba("read %d bytes from offset %d of LEB %d:%d, PEB %d", | |
414 | len, offset, vol_id, lnum, pnum); | |
415 | ||
416 | if (vol->vol_type == UBI_DYNAMIC_VOLUME) | |
417 | check = 0; | |
418 | ||
419 | retry: | |
420 | if (check) { | |
33818bbb | 421 | vid_hdr = ubi_zalloc_vid_hdr(ubi, GFP_NOFS); |
801c135c AB |
422 | if (!vid_hdr) { |
423 | err = -ENOMEM; | |
424 | goto out_unlock; | |
425 | } | |
426 | ||
427 | err = ubi_io_read_vid_hdr(ubi, pnum, vid_hdr, 1); | |
428 | if (err && err != UBI_IO_BITFLIPS) { | |
429 | if (err > 0) { | |
430 | /* | |
431 | * The header is either absent or corrupted. | |
432 | * The former case means there is a bug - | |
433 | * switch to read-only mode just in case. | |
434 | * The latter case means a real corruption - we | |
435 | * may try to recover data. FIXME: but this is | |
436 | * not implemented. | |
437 | */ | |
438 | if (err == UBI_IO_BAD_VID_HDR) { | |
439 | ubi_warn("bad VID header at PEB %d, LEB" | |
440 | "%d:%d", pnum, vol_id, lnum); | |
441 | err = -EBADMSG; | |
442 | } else | |
443 | ubi_ro_mode(ubi); | |
444 | } | |
445 | goto out_free; | |
446 | } else if (err == UBI_IO_BITFLIPS) | |
447 | scrub = 1; | |
448 | ||
3261ebd7 CH |
449 | ubi_assert(lnum < be32_to_cpu(vid_hdr->used_ebs)); |
450 | ubi_assert(len == be32_to_cpu(vid_hdr->data_size)); | |
801c135c | 451 | |
3261ebd7 | 452 | crc = be32_to_cpu(vid_hdr->data_crc); |
801c135c AB |
453 | ubi_free_vid_hdr(ubi, vid_hdr); |
454 | } | |
455 | ||
456 | err = ubi_io_read_data(ubi, buf, pnum, offset, len); | |
457 | if (err) { | |
458 | if (err == UBI_IO_BITFLIPS) { | |
459 | scrub = 1; | |
460 | err = 0; | |
461 | } else if (err == -EBADMSG) { | |
462 | if (vol->vol_type == UBI_DYNAMIC_VOLUME) | |
463 | goto out_unlock; | |
464 | scrub = 1; | |
465 | if (!check) { | |
466 | ubi_msg("force data checking"); | |
467 | check = 1; | |
468 | goto retry; | |
469 | } | |
470 | } else | |
471 | goto out_unlock; | |
472 | } | |
473 | ||
474 | if (check) { | |
2ab934b8 | 475 | uint32_t crc1 = crc32(UBI_CRC32_INIT, buf, len); |
801c135c AB |
476 | if (crc1 != crc) { |
477 | ubi_warn("CRC error: calculated %#08x, must be %#08x", | |
478 | crc1, crc); | |
479 | err = -EBADMSG; | |
480 | goto out_unlock; | |
481 | } | |
482 | } | |
483 | ||
484 | if (scrub) | |
485 | err = ubi_wl_scrub_peb(ubi, pnum); | |
486 | ||
487 | leb_read_unlock(ubi, vol_id, lnum); | |
488 | return err; | |
489 | ||
490 | out_free: | |
491 | ubi_free_vid_hdr(ubi, vid_hdr); | |
492 | out_unlock: | |
493 | leb_read_unlock(ubi, vol_id, lnum); | |
494 | return err; | |
495 | } | |
496 | ||
497 | /** | |
498 | * recover_peb - recover from write failure. | |
499 | * @ubi: UBI device description object | |
500 | * @pnum: the physical eraseblock to recover | |
501 | * @vol_id: volume ID | |
502 | * @lnum: logical eraseblock number | |
503 | * @buf: data which was not written because of the write failure | |
504 | * @offset: offset of the failed write | |
505 | * @len: how many bytes should have been written | |
506 | * | |
507 | * This function is called in case of a write failure and moves all good data | |
508 | * from the potentially bad physical eraseblock to a good physical eraseblock. | |
509 | * This function also writes the data which was not written due to the failure. | |
510 | * Returns new physical eraseblock number in case of success, and a negative | |
511 | * error code in case of failure. | |
512 | */ | |
513 | static int recover_peb(struct ubi_device *ubi, int pnum, int vol_id, int lnum, | |
514 | const void *buf, int offset, int len) | |
515 | { | |
516 | int err, idx = vol_id2idx(ubi, vol_id), new_pnum, data_size, tries = 0; | |
517 | struct ubi_volume *vol = ubi->volumes[idx]; | |
518 | struct ubi_vid_hdr *vid_hdr; | |
801c135c | 519 | |
33818bbb | 520 | vid_hdr = ubi_zalloc_vid_hdr(ubi, GFP_NOFS); |
801c135c AB |
521 | if (!vid_hdr) { |
522 | return -ENOMEM; | |
523 | } | |
524 | ||
e88d6e10 AB |
525 | mutex_lock(&ubi->buf_mutex); |
526 | ||
801c135c AB |
527 | retry: |
528 | new_pnum = ubi_wl_get_peb(ubi, UBI_UNKNOWN); | |
529 | if (new_pnum < 0) { | |
e88d6e10 | 530 | mutex_unlock(&ubi->buf_mutex); |
801c135c AB |
531 | ubi_free_vid_hdr(ubi, vid_hdr); |
532 | return new_pnum; | |
533 | } | |
534 | ||
535 | ubi_msg("recover PEB %d, move data to PEB %d", pnum, new_pnum); | |
536 | ||
537 | err = ubi_io_read_vid_hdr(ubi, pnum, vid_hdr, 1); | |
538 | if (err && err != UBI_IO_BITFLIPS) { | |
539 | if (err > 0) | |
540 | err = -EIO; | |
541 | goto out_put; | |
542 | } | |
543 | ||
3261ebd7 | 544 | vid_hdr->sqnum = cpu_to_be64(next_sqnum(ubi)); |
801c135c AB |
545 | err = ubi_io_write_vid_hdr(ubi, new_pnum, vid_hdr); |
546 | if (err) | |
547 | goto write_error; | |
548 | ||
549 | data_size = offset + len; | |
e88d6e10 | 550 | memset(ubi->peb_buf1 + offset, 0xFF, len); |
801c135c AB |
551 | |
552 | /* Read everything before the area where the write failure happened */ | |
553 | if (offset > 0) { | |
e88d6e10 AB |
554 | err = ubi_io_read_data(ubi, ubi->peb_buf1, pnum, 0, offset); |
555 | if (err && err != UBI_IO_BITFLIPS) | |
801c135c | 556 | goto out_put; |
801c135c AB |
557 | } |
558 | ||
e88d6e10 | 559 | memcpy(ubi->peb_buf1 + offset, buf, len); |
801c135c | 560 | |
e88d6e10 AB |
561 | err = ubi_io_write_data(ubi, ubi->peb_buf1, new_pnum, 0, data_size); |
562 | if (err) | |
801c135c | 563 | goto write_error; |
801c135c | 564 | |
e88d6e10 | 565 | mutex_unlock(&ubi->buf_mutex); |
801c135c AB |
566 | ubi_free_vid_hdr(ubi, vid_hdr); |
567 | ||
568 | vol->eba_tbl[lnum] = new_pnum; | |
569 | ubi_wl_put_peb(ubi, pnum, 1); | |
570 | ||
571 | ubi_msg("data was successfully recovered"); | |
572 | return 0; | |
573 | ||
574 | out_put: | |
e88d6e10 | 575 | mutex_unlock(&ubi->buf_mutex); |
801c135c AB |
576 | ubi_wl_put_peb(ubi, new_pnum, 1); |
577 | ubi_free_vid_hdr(ubi, vid_hdr); | |
578 | return err; | |
579 | ||
580 | write_error: | |
581 | /* | |
582 | * Bad luck? This physical eraseblock is bad too? Crud. Let's try to | |
583 | * get another one. | |
584 | */ | |
585 | ubi_warn("failed to write to PEB %d", new_pnum); | |
586 | ubi_wl_put_peb(ubi, new_pnum, 1); | |
587 | if (++tries > UBI_IO_RETRIES) { | |
e88d6e10 | 588 | mutex_unlock(&ubi->buf_mutex); |
801c135c AB |
589 | ubi_free_vid_hdr(ubi, vid_hdr); |
590 | return err; | |
591 | } | |
592 | ubi_msg("try again"); | |
593 | goto retry; | |
594 | } | |
595 | ||
596 | /** | |
597 | * ubi_eba_write_leb - write data to dynamic volume. | |
598 | * @ubi: UBI device description object | |
89b96b69 | 599 | * @vol: volume description object |
801c135c AB |
600 | * @lnum: logical eraseblock number |
601 | * @buf: the data to write | |
602 | * @offset: offset within the logical eraseblock where to write | |
603 | * @len: how many bytes to write | |
604 | * @dtype: data type | |
605 | * | |
606 | * This function writes data to logical eraseblock @lnum of a dynamic volume | |
89b96b69 | 607 | * @vol. Returns zero in case of success and a negative error code in case |
801c135c AB |
608 | * of failure. In case of error, it is possible that something was still |
609 | * written to the flash media, but may be some garbage. | |
610 | */ | |
89b96b69 | 611 | int ubi_eba_write_leb(struct ubi_device *ubi, struct ubi_volume *vol, int lnum, |
801c135c AB |
612 | const void *buf, int offset, int len, int dtype) |
613 | { | |
89b96b69 | 614 | int err, pnum, tries = 0, vol_id = vol->vol_id; |
801c135c AB |
615 | struct ubi_vid_hdr *vid_hdr; |
616 | ||
d05c77a8 AB |
617 | ubi_assert(vol->ref_count > 0); |
618 | ||
801c135c AB |
619 | if (ubi->ro_mode) |
620 | return -EROFS; | |
621 | ||
622 | err = leb_write_lock(ubi, vol_id, lnum); | |
623 | if (err) | |
624 | return err; | |
625 | ||
626 | pnum = vol->eba_tbl[lnum]; | |
627 | if (pnum >= 0) { | |
628 | dbg_eba("write %d bytes at offset %d of LEB %d:%d, PEB %d", | |
629 | len, offset, vol_id, lnum, pnum); | |
630 | ||
631 | err = ubi_io_write_data(ubi, buf, pnum, offset, len); | |
632 | if (err) { | |
633 | ubi_warn("failed to write data to PEB %d", pnum); | |
634 | if (err == -EIO && ubi->bad_allowed) | |
89b96b69 AB |
635 | err = recover_peb(ubi, pnum, vol_id, lnum, buf, |
636 | offset, len); | |
801c135c AB |
637 | if (err) |
638 | ubi_ro_mode(ubi); | |
639 | } | |
640 | leb_write_unlock(ubi, vol_id, lnum); | |
641 | return err; | |
642 | } | |
643 | ||
644 | /* | |
645 | * The logical eraseblock is not mapped. We have to get a free physical | |
646 | * eraseblock and write the volume identifier header there first. | |
647 | */ | |
33818bbb | 648 | vid_hdr = ubi_zalloc_vid_hdr(ubi, GFP_NOFS); |
801c135c AB |
649 | if (!vid_hdr) { |
650 | leb_write_unlock(ubi, vol_id, lnum); | |
651 | return -ENOMEM; | |
652 | } | |
653 | ||
654 | vid_hdr->vol_type = UBI_VID_DYNAMIC; | |
3261ebd7 CH |
655 | vid_hdr->sqnum = cpu_to_be64(next_sqnum(ubi)); |
656 | vid_hdr->vol_id = cpu_to_be32(vol_id); | |
657 | vid_hdr->lnum = cpu_to_be32(lnum); | |
801c135c | 658 | vid_hdr->compat = ubi_get_compat(ubi, vol_id); |
3261ebd7 | 659 | vid_hdr->data_pad = cpu_to_be32(vol->data_pad); |
801c135c AB |
660 | |
661 | retry: | |
662 | pnum = ubi_wl_get_peb(ubi, dtype); | |
663 | if (pnum < 0) { | |
664 | ubi_free_vid_hdr(ubi, vid_hdr); | |
665 | leb_write_unlock(ubi, vol_id, lnum); | |
666 | return pnum; | |
667 | } | |
668 | ||
669 | dbg_eba("write VID hdr and %d bytes at offset %d of LEB %d:%d, PEB %d", | |
670 | len, offset, vol_id, lnum, pnum); | |
671 | ||
672 | err = ubi_io_write_vid_hdr(ubi, pnum, vid_hdr); | |
673 | if (err) { | |
674 | ubi_warn("failed to write VID header to LEB %d:%d, PEB %d", | |
675 | vol_id, lnum, pnum); | |
676 | goto write_error; | |
677 | } | |
678 | ||
393852ec AB |
679 | if (len) { |
680 | err = ubi_io_write_data(ubi, buf, pnum, offset, len); | |
681 | if (err) { | |
682 | ubi_warn("failed to write %d bytes at offset %d of " | |
683 | "LEB %d:%d, PEB %d", len, offset, vol_id, | |
684 | lnum, pnum); | |
685 | goto write_error; | |
686 | } | |
801c135c AB |
687 | } |
688 | ||
689 | vol->eba_tbl[lnum] = pnum; | |
690 | ||
691 | leb_write_unlock(ubi, vol_id, lnum); | |
692 | ubi_free_vid_hdr(ubi, vid_hdr); | |
693 | return 0; | |
694 | ||
695 | write_error: | |
696 | if (err != -EIO || !ubi->bad_allowed) { | |
697 | ubi_ro_mode(ubi); | |
698 | leb_write_unlock(ubi, vol_id, lnum); | |
699 | ubi_free_vid_hdr(ubi, vid_hdr); | |
700 | return err; | |
701 | } | |
702 | ||
703 | /* | |
704 | * Fortunately, this is the first write operation to this physical | |
705 | * eraseblock, so just put it and request a new one. We assume that if | |
706 | * this physical eraseblock went bad, the erase code will handle that. | |
707 | */ | |
708 | err = ubi_wl_put_peb(ubi, pnum, 1); | |
709 | if (err || ++tries > UBI_IO_RETRIES) { | |
710 | ubi_ro_mode(ubi); | |
711 | leb_write_unlock(ubi, vol_id, lnum); | |
712 | ubi_free_vid_hdr(ubi, vid_hdr); | |
713 | return err; | |
714 | } | |
715 | ||
3261ebd7 | 716 | vid_hdr->sqnum = cpu_to_be64(next_sqnum(ubi)); |
801c135c AB |
717 | ubi_msg("try another PEB"); |
718 | goto retry; | |
719 | } | |
720 | ||
721 | /** | |
722 | * ubi_eba_write_leb_st - write data to static volume. | |
723 | * @ubi: UBI device description object | |
89b96b69 | 724 | * @vol: volume description object |
801c135c AB |
725 | * @lnum: logical eraseblock number |
726 | * @buf: data to write | |
727 | * @len: how many bytes to write | |
728 | * @dtype: data type | |
729 | * @used_ebs: how many logical eraseblocks will this volume contain | |
730 | * | |
731 | * This function writes data to logical eraseblock @lnum of static volume | |
89b96b69 | 732 | * @vol. The @used_ebs argument should contain total number of logical |
801c135c AB |
733 | * eraseblock in this static volume. |
734 | * | |
735 | * When writing to the last logical eraseblock, the @len argument doesn't have | |
736 | * to be aligned to the minimal I/O unit size. Instead, it has to be equivalent | |
737 | * to the real data size, although the @buf buffer has to contain the | |
738 | * alignment. In all other cases, @len has to be aligned. | |
739 | * | |
740 | * It is prohibited to write more then once to logical eraseblocks of static | |
741 | * volumes. This function returns zero in case of success and a negative error | |
742 | * code in case of failure. | |
743 | */ | |
89b96b69 AB |
744 | int ubi_eba_write_leb_st(struct ubi_device *ubi, struct ubi_volume *vol, |
745 | int lnum, const void *buf, int len, int dtype, | |
746 | int used_ebs) | |
801c135c | 747 | { |
89b96b69 | 748 | int err, pnum, tries = 0, data_size = len, vol_id = vol->vol_id; |
801c135c AB |
749 | struct ubi_vid_hdr *vid_hdr; |
750 | uint32_t crc; | |
751 | ||
d05c77a8 AB |
752 | ubi_assert(vol->ref_count > 0); |
753 | ||
801c135c AB |
754 | if (ubi->ro_mode) |
755 | return -EROFS; | |
756 | ||
757 | if (lnum == used_ebs - 1) | |
758 | /* If this is the last LEB @len may be unaligned */ | |
759 | len = ALIGN(data_size, ubi->min_io_size); | |
760 | else | |
761 | ubi_assert(len % ubi->min_io_size == 0); | |
762 | ||
33818bbb | 763 | vid_hdr = ubi_zalloc_vid_hdr(ubi, GFP_NOFS); |
801c135c AB |
764 | if (!vid_hdr) |
765 | return -ENOMEM; | |
766 | ||
767 | err = leb_write_lock(ubi, vol_id, lnum); | |
768 | if (err) { | |
769 | ubi_free_vid_hdr(ubi, vid_hdr); | |
770 | return err; | |
771 | } | |
772 | ||
3261ebd7 CH |
773 | vid_hdr->sqnum = cpu_to_be64(next_sqnum(ubi)); |
774 | vid_hdr->vol_id = cpu_to_be32(vol_id); | |
775 | vid_hdr->lnum = cpu_to_be32(lnum); | |
801c135c | 776 | vid_hdr->compat = ubi_get_compat(ubi, vol_id); |
3261ebd7 | 777 | vid_hdr->data_pad = cpu_to_be32(vol->data_pad); |
801c135c AB |
778 | |
779 | crc = crc32(UBI_CRC32_INIT, buf, data_size); | |
780 | vid_hdr->vol_type = UBI_VID_STATIC; | |
3261ebd7 CH |
781 | vid_hdr->data_size = cpu_to_be32(data_size); |
782 | vid_hdr->used_ebs = cpu_to_be32(used_ebs); | |
783 | vid_hdr->data_crc = cpu_to_be32(crc); | |
801c135c AB |
784 | |
785 | retry: | |
786 | pnum = ubi_wl_get_peb(ubi, dtype); | |
787 | if (pnum < 0) { | |
788 | ubi_free_vid_hdr(ubi, vid_hdr); | |
789 | leb_write_unlock(ubi, vol_id, lnum); | |
790 | return pnum; | |
791 | } | |
792 | ||
793 | dbg_eba("write VID hdr and %d bytes at LEB %d:%d, PEB %d, used_ebs %d", | |
794 | len, vol_id, lnum, pnum, used_ebs); | |
795 | ||
796 | err = ubi_io_write_vid_hdr(ubi, pnum, vid_hdr); | |
797 | if (err) { | |
798 | ubi_warn("failed to write VID header to LEB %d:%d, PEB %d", | |
799 | vol_id, lnum, pnum); | |
800 | goto write_error; | |
801 | } | |
802 | ||
803 | err = ubi_io_write_data(ubi, buf, pnum, 0, len); | |
804 | if (err) { | |
805 | ubi_warn("failed to write %d bytes of data to PEB %d", | |
806 | len, pnum); | |
807 | goto write_error; | |
808 | } | |
809 | ||
810 | ubi_assert(vol->eba_tbl[lnum] < 0); | |
811 | vol->eba_tbl[lnum] = pnum; | |
812 | ||
813 | leb_write_unlock(ubi, vol_id, lnum); | |
814 | ubi_free_vid_hdr(ubi, vid_hdr); | |
815 | return 0; | |
816 | ||
817 | write_error: | |
818 | if (err != -EIO || !ubi->bad_allowed) { | |
819 | /* | |
820 | * This flash device does not admit of bad eraseblocks or | |
821 | * something nasty and unexpected happened. Switch to read-only | |
822 | * mode just in case. | |
823 | */ | |
824 | ubi_ro_mode(ubi); | |
825 | leb_write_unlock(ubi, vol_id, lnum); | |
826 | ubi_free_vid_hdr(ubi, vid_hdr); | |
827 | return err; | |
828 | } | |
829 | ||
830 | err = ubi_wl_put_peb(ubi, pnum, 1); | |
831 | if (err || ++tries > UBI_IO_RETRIES) { | |
832 | ubi_ro_mode(ubi); | |
833 | leb_write_unlock(ubi, vol_id, lnum); | |
834 | ubi_free_vid_hdr(ubi, vid_hdr); | |
835 | return err; | |
836 | } | |
837 | ||
3261ebd7 | 838 | vid_hdr->sqnum = cpu_to_be64(next_sqnum(ubi)); |
801c135c AB |
839 | ubi_msg("try another PEB"); |
840 | goto retry; | |
841 | } | |
842 | ||
843 | /* | |
844 | * ubi_eba_atomic_leb_change - change logical eraseblock atomically. | |
845 | * @ubi: UBI device description object | |
c63a491d | 846 | * @vol: volume description object |
801c135c AB |
847 | * @lnum: logical eraseblock number |
848 | * @buf: data to write | |
849 | * @len: how many bytes to write | |
850 | * @dtype: data type | |
851 | * | |
852 | * This function changes the contents of a logical eraseblock atomically. @buf | |
853 | * has to contain new logical eraseblock data, and @len - the length of the | |
854 | * data, which has to be aligned. This function guarantees that in case of an | |
855 | * unclean reboot the old contents is preserved. Returns zero in case of | |
856 | * success and a negative error code in case of failure. | |
e8823bd6 AB |
857 | * |
858 | * UBI reserves one LEB for the "atomic LEB change" operation, so only one | |
859 | * LEB change may be done at a time. This is ensured by @ubi->alc_mutex. | |
801c135c | 860 | */ |
89b96b69 AB |
861 | int ubi_eba_atomic_leb_change(struct ubi_device *ubi, struct ubi_volume *vol, |
862 | int lnum, const void *buf, int len, int dtype) | |
801c135c | 863 | { |
89b96b69 | 864 | int err, pnum, tries = 0, vol_id = vol->vol_id; |
801c135c AB |
865 | struct ubi_vid_hdr *vid_hdr; |
866 | uint32_t crc; | |
867 | ||
d05c77a8 AB |
868 | ubi_assert(vol->ref_count > 0); |
869 | ||
801c135c AB |
870 | if (ubi->ro_mode) |
871 | return -EROFS; | |
872 | ||
33818bbb | 873 | vid_hdr = ubi_zalloc_vid_hdr(ubi, GFP_NOFS); |
801c135c AB |
874 | if (!vid_hdr) |
875 | return -ENOMEM; | |
876 | ||
e8823bd6 | 877 | mutex_lock(&ubi->alc_mutex); |
801c135c | 878 | err = leb_write_lock(ubi, vol_id, lnum); |
e8823bd6 AB |
879 | if (err) |
880 | goto out_mutex; | |
801c135c | 881 | |
3261ebd7 CH |
882 | vid_hdr->sqnum = cpu_to_be64(next_sqnum(ubi)); |
883 | vid_hdr->vol_id = cpu_to_be32(vol_id); | |
884 | vid_hdr->lnum = cpu_to_be32(lnum); | |
801c135c | 885 | vid_hdr->compat = ubi_get_compat(ubi, vol_id); |
3261ebd7 | 886 | vid_hdr->data_pad = cpu_to_be32(vol->data_pad); |
801c135c AB |
887 | |
888 | crc = crc32(UBI_CRC32_INIT, buf, len); | |
84a92580 | 889 | vid_hdr->vol_type = UBI_VID_DYNAMIC; |
3261ebd7 | 890 | vid_hdr->data_size = cpu_to_be32(len); |
801c135c | 891 | vid_hdr->copy_flag = 1; |
3261ebd7 | 892 | vid_hdr->data_crc = cpu_to_be32(crc); |
801c135c AB |
893 | |
894 | retry: | |
895 | pnum = ubi_wl_get_peb(ubi, dtype); | |
896 | if (pnum < 0) { | |
e8823bd6 AB |
897 | err = pnum; |
898 | goto out_leb_unlock; | |
801c135c AB |
899 | } |
900 | ||
901 | dbg_eba("change LEB %d:%d, PEB %d, write VID hdr to PEB %d", | |
902 | vol_id, lnum, vol->eba_tbl[lnum], pnum); | |
903 | ||
904 | err = ubi_io_write_vid_hdr(ubi, pnum, vid_hdr); | |
905 | if (err) { | |
906 | ubi_warn("failed to write VID header to LEB %d:%d, PEB %d", | |
907 | vol_id, lnum, pnum); | |
908 | goto write_error; | |
909 | } | |
910 | ||
911 | err = ubi_io_write_data(ubi, buf, pnum, 0, len); | |
912 | if (err) { | |
913 | ubi_warn("failed to write %d bytes of data to PEB %d", | |
914 | len, pnum); | |
915 | goto write_error; | |
916 | } | |
917 | ||
a443db48 AB |
918 | if (vol->eba_tbl[lnum] >= 0) { |
919 | err = ubi_wl_put_peb(ubi, vol->eba_tbl[lnum], 1); | |
e8823bd6 AB |
920 | if (err) |
921 | goto out_leb_unlock; | |
801c135c AB |
922 | } |
923 | ||
924 | vol->eba_tbl[lnum] = pnum; | |
e8823bd6 AB |
925 | |
926 | out_leb_unlock: | |
801c135c | 927 | leb_write_unlock(ubi, vol_id, lnum); |
e8823bd6 AB |
928 | out_mutex: |
929 | mutex_unlock(&ubi->alc_mutex); | |
801c135c | 930 | ubi_free_vid_hdr(ubi, vid_hdr); |
e8823bd6 | 931 | return err; |
801c135c AB |
932 | |
933 | write_error: | |
934 | if (err != -EIO || !ubi->bad_allowed) { | |
935 | /* | |
936 | * This flash device does not admit of bad eraseblocks or | |
937 | * something nasty and unexpected happened. Switch to read-only | |
938 | * mode just in case. | |
939 | */ | |
940 | ubi_ro_mode(ubi); | |
e8823bd6 | 941 | goto out_leb_unlock; |
801c135c AB |
942 | } |
943 | ||
944 | err = ubi_wl_put_peb(ubi, pnum, 1); | |
945 | if (err || ++tries > UBI_IO_RETRIES) { | |
946 | ubi_ro_mode(ubi); | |
e8823bd6 | 947 | goto out_leb_unlock; |
801c135c AB |
948 | } |
949 | ||
3261ebd7 | 950 | vid_hdr->sqnum = cpu_to_be64(next_sqnum(ubi)); |
801c135c AB |
951 | ubi_msg("try another PEB"); |
952 | goto retry; | |
953 | } | |
954 | ||
801c135c AB |
955 | /** |
956 | * ubi_eba_copy_leb - copy logical eraseblock. | |
957 | * @ubi: UBI device description object | |
958 | * @from: physical eraseblock number from where to copy | |
959 | * @to: physical eraseblock number where to copy | |
960 | * @vid_hdr: VID header of the @from physical eraseblock | |
961 | * | |
962 | * This function copies logical eraseblock from physical eraseblock @from to | |
963 | * physical eraseblock @to. The @vid_hdr buffer may be changed by this | |
43f9b25a AB |
964 | * function. Returns: |
965 | * o %0 in case of success; | |
966 | * o %1 if the operation was canceled and should be tried later (e.g., | |
967 | * because a bit-flip was detected at the target PEB); | |
968 | * o %2 if the volume is being deleted and this LEB should not be moved. | |
801c135c AB |
969 | */ |
970 | int ubi_eba_copy_leb(struct ubi_device *ubi, int from, int to, | |
971 | struct ubi_vid_hdr *vid_hdr) | |
972 | { | |
43f9b25a | 973 | int err, vol_id, lnum, data_size, aldata_size, idx; |
801c135c AB |
974 | struct ubi_volume *vol; |
975 | uint32_t crc; | |
801c135c | 976 | |
3261ebd7 CH |
977 | vol_id = be32_to_cpu(vid_hdr->vol_id); |
978 | lnum = be32_to_cpu(vid_hdr->lnum); | |
801c135c AB |
979 | |
980 | dbg_eba("copy LEB %d:%d, PEB %d to PEB %d", vol_id, lnum, from, to); | |
981 | ||
982 | if (vid_hdr->vol_type == UBI_VID_STATIC) { | |
3261ebd7 | 983 | data_size = be32_to_cpu(vid_hdr->data_size); |
801c135c AB |
984 | aldata_size = ALIGN(data_size, ubi->min_io_size); |
985 | } else | |
986 | data_size = aldata_size = | |
3261ebd7 | 987 | ubi->leb_size - be32_to_cpu(vid_hdr->data_pad); |
801c135c | 988 | |
801c135c | 989 | idx = vol_id2idx(ubi, vol_id); |
43f9b25a | 990 | spin_lock(&ubi->volumes_lock); |
801c135c | 991 | /* |
43f9b25a AB |
992 | * Note, we may race with volume deletion, which means that the volume |
993 | * this logical eraseblock belongs to might be being deleted. Since the | |
994 | * volume deletion unmaps all the volume's logical eraseblocks, it will | |
995 | * be locked in 'ubi_wl_put_peb()' and wait for the WL worker to finish. | |
801c135c | 996 | */ |
801c135c AB |
997 | vol = ubi->volumes[idx]; |
998 | if (!vol) { | |
43f9b25a AB |
999 | /* No need to do further work, cancel */ |
1000 | dbg_eba("volume %d is being removed, cancel", vol_id); | |
801c135c | 1001 | spin_unlock(&ubi->volumes_lock); |
43f9b25a | 1002 | return 2; |
801c135c | 1003 | } |
43f9b25a | 1004 | spin_unlock(&ubi->volumes_lock); |
801c135c | 1005 | |
43f9b25a AB |
1006 | /* |
1007 | * We do not want anybody to write to this logical eraseblock while we | |
1008 | * are moving it, so lock it. | |
1009 | * | |
1010 | * Note, we are using non-waiting locking here, because we cannot sleep | |
1011 | * on the LEB, since it may cause deadlocks. Indeed, imagine a task is | |
1012 | * unmapping the LEB which is mapped to the PEB we are going to move | |
1013 | * (@from). This task locks the LEB and goes sleep in the | |
1014 | * 'ubi_wl_put_peb()' function on the @ubi->move_mutex. In turn, we are | |
1015 | * holding @ubi->move_mutex and go sleep on the LEB lock. So, if the | |
1016 | * LEB is already locked, we just do not move it and return %1. | |
1017 | */ | |
1018 | err = leb_write_trylock(ubi, vol_id, lnum); | |
1019 | if (err) { | |
1020 | dbg_eba("contention on LEB %d:%d, cancel", vol_id, lnum); | |
1021 | return err; | |
801c135c | 1022 | } |
801c135c | 1023 | |
43f9b25a AB |
1024 | /* |
1025 | * The LEB might have been put meanwhile, and the task which put it is | |
1026 | * probably waiting on @ubi->move_mutex. No need to continue the work, | |
1027 | * cancel it. | |
1028 | */ | |
1029 | if (vol->eba_tbl[lnum] != from) { | |
1030 | dbg_eba("LEB %d:%d is no longer mapped to PEB %d, mapped to " | |
1031 | "PEB %d, cancel", vol_id, lnum, from, | |
1032 | vol->eba_tbl[lnum]); | |
1033 | err = 1; | |
1034 | goto out_unlock_leb; | |
1035 | } | |
801c135c | 1036 | |
43f9b25a AB |
1037 | /* |
1038 | * OK, now the LEB is locked and we can safely start moving iy. Since | |
1039 | * this function utilizes thie @ubi->peb1_buf buffer which is shared | |
1040 | * with some other functions, so lock the buffer by taking the | |
1041 | * @ubi->buf_mutex. | |
1042 | */ | |
1043 | mutex_lock(&ubi->buf_mutex); | |
801c135c | 1044 | dbg_eba("read %d bytes of data", aldata_size); |
e88d6e10 | 1045 | err = ubi_io_read_data(ubi, ubi->peb_buf1, from, 0, aldata_size); |
801c135c AB |
1046 | if (err && err != UBI_IO_BITFLIPS) { |
1047 | ubi_warn("error %d while reading data from PEB %d", | |
1048 | err, from); | |
43f9b25a | 1049 | goto out_unlock_buf; |
801c135c AB |
1050 | } |
1051 | ||
1052 | /* | |
1053 | * Now we have got to calculate how much data we have to to copy. In | |
1054 | * case of a static volume it is fairly easy - the VID header contains | |
1055 | * the data size. In case of a dynamic volume it is more difficult - we | |
1056 | * have to read the contents, cut 0xFF bytes from the end and copy only | |
1057 | * the first part. We must do this to avoid writing 0xFF bytes as it | |
1058 | * may have some side-effects. And not only this. It is important not | |
1059 | * to include those 0xFFs to CRC because later the they may be filled | |
1060 | * by data. | |
1061 | */ | |
1062 | if (vid_hdr->vol_type == UBI_VID_DYNAMIC) | |
1063 | aldata_size = data_size = | |
e88d6e10 | 1064 | ubi_calc_data_len(ubi, ubi->peb_buf1, data_size); |
801c135c AB |
1065 | |
1066 | cond_resched(); | |
e88d6e10 | 1067 | crc = crc32(UBI_CRC32_INIT, ubi->peb_buf1, data_size); |
801c135c AB |
1068 | cond_resched(); |
1069 | ||
1070 | /* | |
1071 | * It may turn out to me that the whole @from physical eraseblock | |
1072 | * contains only 0xFF bytes. Then we have to only write the VID header | |
1073 | * and do not write any data. This also means we should not set | |
1074 | * @vid_hdr->copy_flag, @vid_hdr->data_size, and @vid_hdr->data_crc. | |
1075 | */ | |
1076 | if (data_size > 0) { | |
1077 | vid_hdr->copy_flag = 1; | |
3261ebd7 CH |
1078 | vid_hdr->data_size = cpu_to_be32(data_size); |
1079 | vid_hdr->data_crc = cpu_to_be32(crc); | |
801c135c | 1080 | } |
3261ebd7 | 1081 | vid_hdr->sqnum = cpu_to_be64(next_sqnum(ubi)); |
801c135c AB |
1082 | |
1083 | err = ubi_io_write_vid_hdr(ubi, to, vid_hdr); | |
1084 | if (err) | |
43f9b25a | 1085 | goto out_unlock_buf; |
801c135c AB |
1086 | |
1087 | cond_resched(); | |
1088 | ||
1089 | /* Read the VID header back and check if it was written correctly */ | |
1090 | err = ubi_io_read_vid_hdr(ubi, to, vid_hdr, 1); | |
1091 | if (err) { | |
1092 | if (err != UBI_IO_BITFLIPS) | |
1093 | ubi_warn("cannot read VID header back from PEB %d", to); | |
43f9b25a AB |
1094 | else |
1095 | err = 1; | |
1096 | goto out_unlock_buf; | |
801c135c AB |
1097 | } |
1098 | ||
1099 | if (data_size > 0) { | |
e88d6e10 | 1100 | err = ubi_io_write_data(ubi, ubi->peb_buf1, to, 0, aldata_size); |
801c135c | 1101 | if (err) |
43f9b25a | 1102 | goto out_unlock_buf; |
801c135c | 1103 | |
e88d6e10 AB |
1104 | cond_resched(); |
1105 | ||
801c135c AB |
1106 | /* |
1107 | * We've written the data and are going to read it back to make | |
1108 | * sure it was written correctly. | |
1109 | */ | |
801c135c | 1110 | |
e88d6e10 | 1111 | err = ubi_io_read_data(ubi, ubi->peb_buf2, to, 0, aldata_size); |
801c135c AB |
1112 | if (err) { |
1113 | if (err != UBI_IO_BITFLIPS) | |
1114 | ubi_warn("cannot read data back from PEB %d", | |
1115 | to); | |
43f9b25a AB |
1116 | else |
1117 | err = 1; | |
1118 | goto out_unlock_buf; | |
801c135c AB |
1119 | } |
1120 | ||
1121 | cond_resched(); | |
1122 | ||
e88d6e10 | 1123 | if (memcmp(ubi->peb_buf1, ubi->peb_buf2, aldata_size)) { |
801c135c AB |
1124 | ubi_warn("read data back from PEB %d - it is different", |
1125 | to); | |
43f9b25a | 1126 | goto out_unlock_buf; |
801c135c AB |
1127 | } |
1128 | } | |
1129 | ||
1130 | ubi_assert(vol->eba_tbl[lnum] == from); | |
1131 | vol->eba_tbl[lnum] = to; | |
1132 | ||
43f9b25a | 1133 | out_unlock_buf: |
e88d6e10 | 1134 | mutex_unlock(&ubi->buf_mutex); |
43f9b25a | 1135 | out_unlock_leb: |
801c135c | 1136 | leb_write_unlock(ubi, vol_id, lnum); |
801c135c AB |
1137 | return err; |
1138 | } | |
1139 | ||
1140 | /** | |
1141 | * ubi_eba_init_scan - initialize the EBA unit using scanning information. | |
1142 | * @ubi: UBI device description object | |
1143 | * @si: scanning information | |
1144 | * | |
1145 | * This function returns zero in case of success and a negative error code in | |
1146 | * case of failure. | |
1147 | */ | |
1148 | int ubi_eba_init_scan(struct ubi_device *ubi, struct ubi_scan_info *si) | |
1149 | { | |
1150 | int i, j, err, num_volumes; | |
1151 | struct ubi_scan_volume *sv; | |
1152 | struct ubi_volume *vol; | |
1153 | struct ubi_scan_leb *seb; | |
1154 | struct rb_node *rb; | |
1155 | ||
1156 | dbg_eba("initialize EBA unit"); | |
1157 | ||
1158 | spin_lock_init(&ubi->ltree_lock); | |
e8823bd6 | 1159 | mutex_init(&ubi->alc_mutex); |
801c135c AB |
1160 | ubi->ltree = RB_ROOT; |
1161 | ||
801c135c AB |
1162 | ubi->global_sqnum = si->max_sqnum + 1; |
1163 | num_volumes = ubi->vtbl_slots + UBI_INT_VOL_COUNT; | |
1164 | ||
1165 | for (i = 0; i < num_volumes; i++) { | |
1166 | vol = ubi->volumes[i]; | |
1167 | if (!vol) | |
1168 | continue; | |
1169 | ||
1170 | cond_resched(); | |
1171 | ||
1172 | vol->eba_tbl = kmalloc(vol->reserved_pebs * sizeof(int), | |
1173 | GFP_KERNEL); | |
1174 | if (!vol->eba_tbl) { | |
1175 | err = -ENOMEM; | |
1176 | goto out_free; | |
1177 | } | |
1178 | ||
1179 | for (j = 0; j < vol->reserved_pebs; j++) | |
1180 | vol->eba_tbl[j] = UBI_LEB_UNMAPPED; | |
1181 | ||
1182 | sv = ubi_scan_find_sv(si, idx2vol_id(ubi, i)); | |
1183 | if (!sv) | |
1184 | continue; | |
1185 | ||
1186 | ubi_rb_for_each_entry(rb, seb, &sv->root, u.rb) { | |
1187 | if (seb->lnum >= vol->reserved_pebs) | |
1188 | /* | |
1189 | * This may happen in case of an unclean reboot | |
1190 | * during re-size. | |
1191 | */ | |
1192 | ubi_scan_move_to_list(sv, seb, &si->erase); | |
1193 | vol->eba_tbl[seb->lnum] = seb->pnum; | |
1194 | } | |
1195 | } | |
1196 | ||
94780d4d AB |
1197 | if (ubi->avail_pebs < EBA_RESERVED_PEBS) { |
1198 | ubi_err("no enough physical eraseblocks (%d, need %d)", | |
1199 | ubi->avail_pebs, EBA_RESERVED_PEBS); | |
1200 | err = -ENOSPC; | |
1201 | goto out_free; | |
1202 | } | |
1203 | ubi->avail_pebs -= EBA_RESERVED_PEBS; | |
1204 | ubi->rsvd_pebs += EBA_RESERVED_PEBS; | |
1205 | ||
801c135c AB |
1206 | if (ubi->bad_allowed) { |
1207 | ubi_calculate_reserved(ubi); | |
1208 | ||
1209 | if (ubi->avail_pebs < ubi->beb_rsvd_level) { | |
1210 | /* No enough free physical eraseblocks */ | |
1211 | ubi->beb_rsvd_pebs = ubi->avail_pebs; | |
1212 | ubi_warn("cannot reserve enough PEBs for bad PEB " | |
1213 | "handling, reserved %d, need %d", | |
1214 | ubi->beb_rsvd_pebs, ubi->beb_rsvd_level); | |
1215 | } else | |
1216 | ubi->beb_rsvd_pebs = ubi->beb_rsvd_level; | |
1217 | ||
1218 | ubi->avail_pebs -= ubi->beb_rsvd_pebs; | |
1219 | ubi->rsvd_pebs += ubi->beb_rsvd_pebs; | |
1220 | } | |
1221 | ||
1222 | dbg_eba("EBA unit is initialized"); | |
1223 | return 0; | |
1224 | ||
1225 | out_free: | |
1226 | for (i = 0; i < num_volumes; i++) { | |
1227 | if (!ubi->volumes[i]) | |
1228 | continue; | |
1229 | kfree(ubi->volumes[i]->eba_tbl); | |
1230 | } | |
801c135c AB |
1231 | return err; |
1232 | } | |
1233 | ||
1234 | /** | |
1235 | * ubi_eba_close - close EBA unit. | |
1236 | * @ubi: UBI device description object | |
1237 | */ | |
1238 | void ubi_eba_close(const struct ubi_device *ubi) | |
1239 | { | |
1240 | int i, num_volumes = ubi->vtbl_slots + UBI_INT_VOL_COUNT; | |
1241 | ||
1242 | dbg_eba("close EBA unit"); | |
1243 | ||
1244 | for (i = 0; i < num_volumes; i++) { | |
1245 | if (!ubi->volumes[i]) | |
1246 | continue; | |
1247 | kfree(ubi->volumes[i]->eba_tbl); | |
1248 | } | |
801c135c | 1249 | } |