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 | */ | |
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 | { | |
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 | ||
192 | if (le_free) | |
b9a06623 | 193 | kfree(le_free); |
801c135c AB |
194 | |
195 | return le; | |
196 | } | |
197 | ||
198 | /** | |
199 | * leb_read_lock - lock logical eraseblock for reading. | |
200 | * @ubi: UBI device description object | |
201 | * @vol_id: volume ID | |
202 | * @lnum: logical eraseblock number | |
203 | * | |
204 | * This function locks a logical eraseblock for reading. Returns zero in case | |
205 | * of success and a negative error code in case of failure. | |
206 | */ | |
207 | static int leb_read_lock(struct ubi_device *ubi, int vol_id, int lnum) | |
208 | { | |
3a8d4642 | 209 | struct ubi_ltree_entry *le; |
801c135c AB |
210 | |
211 | le = ltree_add_entry(ubi, vol_id, lnum); | |
212 | if (IS_ERR(le)) | |
213 | return PTR_ERR(le); | |
214 | down_read(&le->mutex); | |
215 | return 0; | |
216 | } | |
217 | ||
218 | /** | |
219 | * leb_read_unlock - unlock logical eraseblock. | |
220 | * @ubi: UBI device description object | |
221 | * @vol_id: volume ID | |
222 | * @lnum: logical eraseblock number | |
223 | */ | |
224 | static void leb_read_unlock(struct ubi_device *ubi, int vol_id, int lnum) | |
225 | { | |
3a8d4642 | 226 | struct ubi_ltree_entry *le; |
801c135c AB |
227 | |
228 | spin_lock(&ubi->ltree_lock); | |
229 | le = ltree_lookup(ubi, vol_id, lnum); | |
230 | le->users -= 1; | |
231 | ubi_assert(le->users >= 0); | |
23add745 | 232 | up_read(&le->mutex); |
801c135c AB |
233 | if (le->users == 0) { |
234 | rb_erase(&le->rb, &ubi->ltree); | |
23add745 | 235 | kfree(le); |
801c135c AB |
236 | } |
237 | spin_unlock(&ubi->ltree_lock); | |
801c135c AB |
238 | } |
239 | ||
240 | /** | |
241 | * leb_write_lock - lock logical eraseblock for writing. | |
242 | * @ubi: UBI device description object | |
243 | * @vol_id: volume ID | |
244 | * @lnum: logical eraseblock number | |
245 | * | |
246 | * This function locks a logical eraseblock for writing. Returns zero in case | |
247 | * of success and a negative error code in case of failure. | |
248 | */ | |
249 | static int leb_write_lock(struct ubi_device *ubi, int vol_id, int lnum) | |
250 | { | |
3a8d4642 | 251 | struct ubi_ltree_entry *le; |
801c135c AB |
252 | |
253 | le = ltree_add_entry(ubi, vol_id, lnum); | |
254 | if (IS_ERR(le)) | |
255 | return PTR_ERR(le); | |
256 | down_write(&le->mutex); | |
257 | return 0; | |
258 | } | |
259 | ||
43f9b25a AB |
260 | /** |
261 | * leb_write_lock - lock logical eraseblock for writing. | |
262 | * @ubi: UBI device description object | |
263 | * @vol_id: volume ID | |
264 | * @lnum: logical eraseblock number | |
265 | * | |
266 | * This function locks a logical eraseblock for writing if there is no | |
267 | * contention and does nothing if there is contention. Returns %0 in case of | |
268 | * success, %1 in case of contention, and and a negative error code in case of | |
269 | * failure. | |
270 | */ | |
271 | static int leb_write_trylock(struct ubi_device *ubi, int vol_id, int lnum) | |
272 | { | |
43f9b25a AB |
273 | struct ubi_ltree_entry *le; |
274 | ||
275 | le = ltree_add_entry(ubi, vol_id, lnum); | |
276 | if (IS_ERR(le)) | |
277 | return PTR_ERR(le); | |
278 | if (down_write_trylock(&le->mutex)) | |
279 | return 0; | |
280 | ||
281 | /* Contention, cancel */ | |
282 | spin_lock(&ubi->ltree_lock); | |
283 | le->users -= 1; | |
284 | ubi_assert(le->users >= 0); | |
285 | if (le->users == 0) { | |
286 | rb_erase(&le->rb, &ubi->ltree); | |
b9a06623 | 287 | kfree(le); |
23add745 AB |
288 | } |
289 | spin_unlock(&ubi->ltree_lock); | |
43f9b25a AB |
290 | |
291 | return 1; | |
292 | } | |
293 | ||
801c135c AB |
294 | /** |
295 | * leb_write_unlock - unlock logical eraseblock. | |
296 | * @ubi: UBI device description object | |
297 | * @vol_id: volume ID | |
298 | * @lnum: logical eraseblock number | |
299 | */ | |
300 | static void leb_write_unlock(struct ubi_device *ubi, int vol_id, int lnum) | |
301 | { | |
3a8d4642 | 302 | struct ubi_ltree_entry *le; |
801c135c AB |
303 | |
304 | spin_lock(&ubi->ltree_lock); | |
305 | le = ltree_lookup(ubi, vol_id, lnum); | |
306 | le->users -= 1; | |
307 | ubi_assert(le->users >= 0); | |
23add745 | 308 | up_write(&le->mutex); |
801c135c AB |
309 | if (le->users == 0) { |
310 | rb_erase(&le->rb, &ubi->ltree); | |
b9a06623 | 311 | kfree(le); |
23add745 AB |
312 | } |
313 | spin_unlock(&ubi->ltree_lock); | |
801c135c AB |
314 | } |
315 | ||
316 | /** | |
317 | * ubi_eba_unmap_leb - un-map logical eraseblock. | |
318 | * @ubi: UBI device description object | |
89b96b69 | 319 | * @vol: volume description object |
801c135c AB |
320 | * @lnum: logical eraseblock number |
321 | * | |
322 | * This function un-maps logical eraseblock @lnum and schedules corresponding | |
323 | * physical eraseblock for erasure. Returns zero in case of success and a | |
324 | * negative error code in case of failure. | |
325 | */ | |
89b96b69 AB |
326 | int ubi_eba_unmap_leb(struct ubi_device *ubi, struct ubi_volume *vol, |
327 | int lnum) | |
801c135c | 328 | { |
89b96b69 | 329 | int err, pnum, vol_id = vol->vol_id; |
801c135c AB |
330 | |
331 | if (ubi->ro_mode) | |
332 | return -EROFS; | |
333 | ||
334 | err = leb_write_lock(ubi, vol_id, lnum); | |
335 | if (err) | |
336 | return err; | |
337 | ||
338 | pnum = vol->eba_tbl[lnum]; | |
339 | if (pnum < 0) | |
340 | /* This logical eraseblock is already unmapped */ | |
341 | goto out_unlock; | |
342 | ||
343 | dbg_eba("erase LEB %d:%d, PEB %d", vol_id, lnum, pnum); | |
344 | ||
345 | vol->eba_tbl[lnum] = UBI_LEB_UNMAPPED; | |
346 | err = ubi_wl_put_peb(ubi, pnum, 0); | |
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 | */ | |
423 | if (err == UBI_IO_BAD_VID_HDR) { | |
424 | ubi_warn("bad VID header at PEB %d, LEB" | |
425 | "%d:%d", pnum, vol_id, lnum); | |
426 | err = -EBADMSG; | |
427 | } else | |
428 | ubi_ro_mode(ubi); | |
429 | } | |
430 | goto out_free; | |
431 | } else if (err == UBI_IO_BITFLIPS) | |
432 | scrub = 1; | |
433 | ||
3261ebd7 CH |
434 | ubi_assert(lnum < be32_to_cpu(vid_hdr->used_ebs)); |
435 | ubi_assert(len == be32_to_cpu(vid_hdr->data_size)); | |
801c135c | 436 | |
3261ebd7 | 437 | crc = be32_to_cpu(vid_hdr->data_crc); |
801c135c AB |
438 | ubi_free_vid_hdr(ubi, vid_hdr); |
439 | } | |
440 | ||
441 | err = ubi_io_read_data(ubi, buf, pnum, offset, len); | |
442 | if (err) { | |
443 | if (err == UBI_IO_BITFLIPS) { | |
444 | scrub = 1; | |
445 | err = 0; | |
446 | } else if (err == -EBADMSG) { | |
447 | if (vol->vol_type == UBI_DYNAMIC_VOLUME) | |
448 | goto out_unlock; | |
449 | scrub = 1; | |
450 | if (!check) { | |
451 | ubi_msg("force data checking"); | |
452 | check = 1; | |
453 | goto retry; | |
454 | } | |
455 | } else | |
456 | goto out_unlock; | |
457 | } | |
458 | ||
459 | if (check) { | |
2ab934b8 | 460 | uint32_t crc1 = crc32(UBI_CRC32_INIT, buf, len); |
801c135c AB |
461 | if (crc1 != crc) { |
462 | ubi_warn("CRC error: calculated %#08x, must be %#08x", | |
463 | crc1, crc); | |
464 | err = -EBADMSG; | |
465 | goto out_unlock; | |
466 | } | |
467 | } | |
468 | ||
469 | if (scrub) | |
470 | err = ubi_wl_scrub_peb(ubi, pnum); | |
471 | ||
472 | leb_read_unlock(ubi, vol_id, lnum); | |
473 | return err; | |
474 | ||
475 | out_free: | |
476 | ubi_free_vid_hdr(ubi, vid_hdr); | |
477 | out_unlock: | |
478 | leb_read_unlock(ubi, vol_id, lnum); | |
479 | return err; | |
480 | } | |
481 | ||
482 | /** | |
483 | * recover_peb - recover from write failure. | |
484 | * @ubi: UBI device description object | |
485 | * @pnum: the physical eraseblock to recover | |
486 | * @vol_id: volume ID | |
487 | * @lnum: logical eraseblock number | |
488 | * @buf: data which was not written because of the write failure | |
489 | * @offset: offset of the failed write | |
490 | * @len: how many bytes should have been written | |
491 | * | |
492 | * This function is called in case of a write failure and moves all good data | |
493 | * from the potentially bad physical eraseblock to a good physical eraseblock. | |
494 | * This function also writes the data which was not written due to the failure. | |
495 | * Returns new physical eraseblock number in case of success, and a negative | |
496 | * error code in case of failure. | |
497 | */ | |
498 | static int recover_peb(struct ubi_device *ubi, int pnum, int vol_id, int lnum, | |
499 | const void *buf, int offset, int len) | |
500 | { | |
501 | int err, idx = vol_id2idx(ubi, vol_id), new_pnum, data_size, tries = 0; | |
502 | struct ubi_volume *vol = ubi->volumes[idx]; | |
503 | struct ubi_vid_hdr *vid_hdr; | |
801c135c | 504 | |
33818bbb | 505 | vid_hdr = ubi_zalloc_vid_hdr(ubi, GFP_NOFS); |
801c135c AB |
506 | if (!vid_hdr) { |
507 | return -ENOMEM; | |
508 | } | |
509 | ||
e88d6e10 AB |
510 | mutex_lock(&ubi->buf_mutex); |
511 | ||
801c135c AB |
512 | retry: |
513 | new_pnum = ubi_wl_get_peb(ubi, UBI_UNKNOWN); | |
514 | if (new_pnum < 0) { | |
e88d6e10 | 515 | mutex_unlock(&ubi->buf_mutex); |
801c135c AB |
516 | ubi_free_vid_hdr(ubi, vid_hdr); |
517 | return new_pnum; | |
518 | } | |
519 | ||
520 | ubi_msg("recover PEB %d, move data to PEB %d", pnum, new_pnum); | |
521 | ||
522 | err = ubi_io_read_vid_hdr(ubi, pnum, vid_hdr, 1); | |
523 | if (err && err != UBI_IO_BITFLIPS) { | |
524 | if (err > 0) | |
525 | err = -EIO; | |
526 | goto out_put; | |
527 | } | |
528 | ||
3261ebd7 | 529 | vid_hdr->sqnum = cpu_to_be64(next_sqnum(ubi)); |
801c135c AB |
530 | err = ubi_io_write_vid_hdr(ubi, new_pnum, vid_hdr); |
531 | if (err) | |
532 | goto write_error; | |
533 | ||
534 | data_size = offset + len; | |
e88d6e10 | 535 | memset(ubi->peb_buf1 + offset, 0xFF, len); |
801c135c AB |
536 | |
537 | /* Read everything before the area where the write failure happened */ | |
538 | if (offset > 0) { | |
e88d6e10 AB |
539 | err = ubi_io_read_data(ubi, ubi->peb_buf1, pnum, 0, offset); |
540 | if (err && err != UBI_IO_BITFLIPS) | |
801c135c | 541 | goto out_put; |
801c135c AB |
542 | } |
543 | ||
e88d6e10 | 544 | memcpy(ubi->peb_buf1 + offset, buf, len); |
801c135c | 545 | |
e88d6e10 AB |
546 | err = ubi_io_write_data(ubi, ubi->peb_buf1, new_pnum, 0, data_size); |
547 | if (err) | |
801c135c | 548 | goto write_error; |
801c135c | 549 | |
e88d6e10 | 550 | mutex_unlock(&ubi->buf_mutex); |
801c135c AB |
551 | ubi_free_vid_hdr(ubi, vid_hdr); |
552 | ||
553 | vol->eba_tbl[lnum] = new_pnum; | |
554 | ubi_wl_put_peb(ubi, pnum, 1); | |
555 | ||
556 | ubi_msg("data was successfully recovered"); | |
557 | return 0; | |
558 | ||
559 | out_put: | |
e88d6e10 | 560 | mutex_unlock(&ubi->buf_mutex); |
801c135c AB |
561 | ubi_wl_put_peb(ubi, new_pnum, 1); |
562 | ubi_free_vid_hdr(ubi, vid_hdr); | |
563 | return err; | |
564 | ||
565 | write_error: | |
566 | /* | |
567 | * Bad luck? This physical eraseblock is bad too? Crud. Let's try to | |
568 | * get another one. | |
569 | */ | |
570 | ubi_warn("failed to write to PEB %d", new_pnum); | |
571 | ubi_wl_put_peb(ubi, new_pnum, 1); | |
572 | if (++tries > UBI_IO_RETRIES) { | |
e88d6e10 | 573 | mutex_unlock(&ubi->buf_mutex); |
801c135c AB |
574 | ubi_free_vid_hdr(ubi, vid_hdr); |
575 | return err; | |
576 | } | |
577 | ubi_msg("try again"); | |
578 | goto retry; | |
579 | } | |
580 | ||
581 | /** | |
582 | * ubi_eba_write_leb - write data to dynamic volume. | |
583 | * @ubi: UBI device description object | |
89b96b69 | 584 | * @vol: volume description object |
801c135c AB |
585 | * @lnum: logical eraseblock number |
586 | * @buf: the data to write | |
587 | * @offset: offset within the logical eraseblock where to write | |
588 | * @len: how many bytes to write | |
589 | * @dtype: data type | |
590 | * | |
591 | * This function writes data to logical eraseblock @lnum of a dynamic volume | |
89b96b69 | 592 | * @vol. Returns zero in case of success and a negative error code in case |
801c135c AB |
593 | * of failure. In case of error, it is possible that something was still |
594 | * written to the flash media, but may be some garbage. | |
595 | */ | |
89b96b69 | 596 | int ubi_eba_write_leb(struct ubi_device *ubi, struct ubi_volume *vol, int lnum, |
801c135c AB |
597 | const void *buf, int offset, int len, int dtype) |
598 | { | |
89b96b69 | 599 | int err, pnum, tries = 0, vol_id = vol->vol_id; |
801c135c AB |
600 | struct ubi_vid_hdr *vid_hdr; |
601 | ||
602 | if (ubi->ro_mode) | |
603 | return -EROFS; | |
604 | ||
605 | err = leb_write_lock(ubi, vol_id, lnum); | |
606 | if (err) | |
607 | return err; | |
608 | ||
609 | pnum = vol->eba_tbl[lnum]; | |
610 | if (pnum >= 0) { | |
611 | dbg_eba("write %d bytes at offset %d of LEB %d:%d, PEB %d", | |
612 | len, offset, vol_id, lnum, pnum); | |
613 | ||
614 | err = ubi_io_write_data(ubi, buf, pnum, offset, len); | |
615 | if (err) { | |
616 | ubi_warn("failed to write data to PEB %d", pnum); | |
617 | if (err == -EIO && ubi->bad_allowed) | |
89b96b69 AB |
618 | err = recover_peb(ubi, pnum, vol_id, lnum, buf, |
619 | offset, len); | |
801c135c AB |
620 | if (err) |
621 | ubi_ro_mode(ubi); | |
622 | } | |
623 | leb_write_unlock(ubi, vol_id, lnum); | |
624 | return err; | |
625 | } | |
626 | ||
627 | /* | |
628 | * The logical eraseblock is not mapped. We have to get a free physical | |
629 | * eraseblock and write the volume identifier header there first. | |
630 | */ | |
33818bbb | 631 | vid_hdr = ubi_zalloc_vid_hdr(ubi, GFP_NOFS); |
801c135c AB |
632 | if (!vid_hdr) { |
633 | leb_write_unlock(ubi, vol_id, lnum); | |
634 | return -ENOMEM; | |
635 | } | |
636 | ||
637 | vid_hdr->vol_type = UBI_VID_DYNAMIC; | |
3261ebd7 CH |
638 | vid_hdr->sqnum = cpu_to_be64(next_sqnum(ubi)); |
639 | vid_hdr->vol_id = cpu_to_be32(vol_id); | |
640 | vid_hdr->lnum = cpu_to_be32(lnum); | |
801c135c | 641 | vid_hdr->compat = ubi_get_compat(ubi, vol_id); |
3261ebd7 | 642 | vid_hdr->data_pad = cpu_to_be32(vol->data_pad); |
801c135c AB |
643 | |
644 | retry: | |
645 | pnum = ubi_wl_get_peb(ubi, dtype); | |
646 | if (pnum < 0) { | |
647 | ubi_free_vid_hdr(ubi, vid_hdr); | |
648 | leb_write_unlock(ubi, vol_id, lnum); | |
649 | return pnum; | |
650 | } | |
651 | ||
652 | dbg_eba("write VID hdr and %d bytes at offset %d of LEB %d:%d, PEB %d", | |
653 | len, offset, vol_id, lnum, pnum); | |
654 | ||
655 | err = ubi_io_write_vid_hdr(ubi, pnum, vid_hdr); | |
656 | if (err) { | |
657 | ubi_warn("failed to write VID header to LEB %d:%d, PEB %d", | |
658 | vol_id, lnum, pnum); | |
659 | goto write_error; | |
660 | } | |
661 | ||
393852ec AB |
662 | if (len) { |
663 | err = ubi_io_write_data(ubi, buf, pnum, offset, len); | |
664 | if (err) { | |
665 | ubi_warn("failed to write %d bytes at offset %d of " | |
666 | "LEB %d:%d, PEB %d", len, offset, vol_id, | |
667 | lnum, pnum); | |
668 | goto write_error; | |
669 | } | |
801c135c AB |
670 | } |
671 | ||
672 | vol->eba_tbl[lnum] = pnum; | |
673 | ||
674 | leb_write_unlock(ubi, vol_id, lnum); | |
675 | ubi_free_vid_hdr(ubi, vid_hdr); | |
676 | return 0; | |
677 | ||
678 | write_error: | |
679 | if (err != -EIO || !ubi->bad_allowed) { | |
680 | ubi_ro_mode(ubi); | |
681 | leb_write_unlock(ubi, vol_id, lnum); | |
682 | ubi_free_vid_hdr(ubi, vid_hdr); | |
683 | return err; | |
684 | } | |
685 | ||
686 | /* | |
687 | * Fortunately, this is the first write operation to this physical | |
688 | * eraseblock, so just put it and request a new one. We assume that if | |
689 | * this physical eraseblock went bad, the erase code will handle that. | |
690 | */ | |
691 | err = ubi_wl_put_peb(ubi, pnum, 1); | |
692 | if (err || ++tries > UBI_IO_RETRIES) { | |
693 | ubi_ro_mode(ubi); | |
694 | leb_write_unlock(ubi, vol_id, lnum); | |
695 | ubi_free_vid_hdr(ubi, vid_hdr); | |
696 | return err; | |
697 | } | |
698 | ||
3261ebd7 | 699 | vid_hdr->sqnum = cpu_to_be64(next_sqnum(ubi)); |
801c135c AB |
700 | ubi_msg("try another PEB"); |
701 | goto retry; | |
702 | } | |
703 | ||
704 | /** | |
705 | * ubi_eba_write_leb_st - write data to static volume. | |
706 | * @ubi: UBI device description object | |
89b96b69 | 707 | * @vol: volume description object |
801c135c AB |
708 | * @lnum: logical eraseblock number |
709 | * @buf: data to write | |
710 | * @len: how many bytes to write | |
711 | * @dtype: data type | |
712 | * @used_ebs: how many logical eraseblocks will this volume contain | |
713 | * | |
714 | * This function writes data to logical eraseblock @lnum of static volume | |
89b96b69 | 715 | * @vol. The @used_ebs argument should contain total number of logical |
801c135c AB |
716 | * eraseblock in this static volume. |
717 | * | |
718 | * When writing to the last logical eraseblock, the @len argument doesn't have | |
719 | * to be aligned to the minimal I/O unit size. Instead, it has to be equivalent | |
720 | * to the real data size, although the @buf buffer has to contain the | |
721 | * alignment. In all other cases, @len has to be aligned. | |
722 | * | |
723 | * It is prohibited to write more then once to logical eraseblocks of static | |
724 | * volumes. This function returns zero in case of success and a negative error | |
725 | * code in case of failure. | |
726 | */ | |
89b96b69 AB |
727 | int ubi_eba_write_leb_st(struct ubi_device *ubi, struct ubi_volume *vol, |
728 | int lnum, const void *buf, int len, int dtype, | |
729 | int used_ebs) | |
801c135c | 730 | { |
89b96b69 | 731 | int err, pnum, tries = 0, data_size = len, vol_id = vol->vol_id; |
801c135c AB |
732 | struct ubi_vid_hdr *vid_hdr; |
733 | uint32_t crc; | |
734 | ||
735 | if (ubi->ro_mode) | |
736 | return -EROFS; | |
737 | ||
738 | if (lnum == used_ebs - 1) | |
739 | /* If this is the last LEB @len may be unaligned */ | |
740 | len = ALIGN(data_size, ubi->min_io_size); | |
741 | else | |
cadb40cc | 742 | ubi_assert(!(len & (ubi->min_io_size - 1))); |
801c135c | 743 | |
33818bbb | 744 | vid_hdr = ubi_zalloc_vid_hdr(ubi, GFP_NOFS); |
801c135c AB |
745 | if (!vid_hdr) |
746 | return -ENOMEM; | |
747 | ||
748 | err = leb_write_lock(ubi, vol_id, lnum); | |
749 | if (err) { | |
750 | ubi_free_vid_hdr(ubi, vid_hdr); | |
751 | return err; | |
752 | } | |
753 | ||
3261ebd7 CH |
754 | vid_hdr->sqnum = cpu_to_be64(next_sqnum(ubi)); |
755 | vid_hdr->vol_id = cpu_to_be32(vol_id); | |
756 | vid_hdr->lnum = cpu_to_be32(lnum); | |
801c135c | 757 | vid_hdr->compat = ubi_get_compat(ubi, vol_id); |
3261ebd7 | 758 | vid_hdr->data_pad = cpu_to_be32(vol->data_pad); |
801c135c AB |
759 | |
760 | crc = crc32(UBI_CRC32_INIT, buf, data_size); | |
761 | vid_hdr->vol_type = UBI_VID_STATIC; | |
3261ebd7 CH |
762 | vid_hdr->data_size = cpu_to_be32(data_size); |
763 | vid_hdr->used_ebs = cpu_to_be32(used_ebs); | |
764 | vid_hdr->data_crc = cpu_to_be32(crc); | |
801c135c AB |
765 | |
766 | retry: | |
767 | pnum = ubi_wl_get_peb(ubi, dtype); | |
768 | if (pnum < 0) { | |
769 | ubi_free_vid_hdr(ubi, vid_hdr); | |
770 | leb_write_unlock(ubi, vol_id, lnum); | |
771 | return pnum; | |
772 | } | |
773 | ||
774 | dbg_eba("write VID hdr and %d bytes at LEB %d:%d, PEB %d, used_ebs %d", | |
775 | len, vol_id, lnum, pnum, used_ebs); | |
776 | ||
777 | err = ubi_io_write_vid_hdr(ubi, pnum, vid_hdr); | |
778 | if (err) { | |
779 | ubi_warn("failed to write VID header to LEB %d:%d, PEB %d", | |
780 | vol_id, lnum, pnum); | |
781 | goto write_error; | |
782 | } | |
783 | ||
784 | err = ubi_io_write_data(ubi, buf, pnum, 0, len); | |
785 | if (err) { | |
786 | ubi_warn("failed to write %d bytes of data to PEB %d", | |
787 | len, pnum); | |
788 | goto write_error; | |
789 | } | |
790 | ||
791 | ubi_assert(vol->eba_tbl[lnum] < 0); | |
792 | vol->eba_tbl[lnum] = pnum; | |
793 | ||
794 | leb_write_unlock(ubi, vol_id, lnum); | |
795 | ubi_free_vid_hdr(ubi, vid_hdr); | |
796 | return 0; | |
797 | ||
798 | write_error: | |
799 | if (err != -EIO || !ubi->bad_allowed) { | |
800 | /* | |
801 | * This flash device does not admit of bad eraseblocks or | |
802 | * something nasty and unexpected happened. Switch to read-only | |
803 | * mode just in case. | |
804 | */ | |
805 | ubi_ro_mode(ubi); | |
806 | leb_write_unlock(ubi, vol_id, lnum); | |
807 | ubi_free_vid_hdr(ubi, vid_hdr); | |
808 | return err; | |
809 | } | |
810 | ||
811 | err = ubi_wl_put_peb(ubi, pnum, 1); | |
812 | if (err || ++tries > UBI_IO_RETRIES) { | |
813 | ubi_ro_mode(ubi); | |
814 | leb_write_unlock(ubi, vol_id, lnum); | |
815 | ubi_free_vid_hdr(ubi, vid_hdr); | |
816 | return err; | |
817 | } | |
818 | ||
3261ebd7 | 819 | vid_hdr->sqnum = cpu_to_be64(next_sqnum(ubi)); |
801c135c AB |
820 | ubi_msg("try another PEB"); |
821 | goto retry; | |
822 | } | |
823 | ||
824 | /* | |
825 | * ubi_eba_atomic_leb_change - change logical eraseblock atomically. | |
826 | * @ubi: UBI device description object | |
c63a491d | 827 | * @vol: volume description object |
801c135c AB |
828 | * @lnum: logical eraseblock number |
829 | * @buf: data to write | |
830 | * @len: how many bytes to write | |
831 | * @dtype: data type | |
832 | * | |
833 | * This function changes the contents of a logical eraseblock atomically. @buf | |
834 | * has to contain new logical eraseblock data, and @len - the length of the | |
835 | * data, which has to be aligned. This function guarantees that in case of an | |
836 | * unclean reboot the old contents is preserved. Returns zero in case of | |
837 | * success and a negative error code in case of failure. | |
e8823bd6 AB |
838 | * |
839 | * UBI reserves one LEB for the "atomic LEB change" operation, so only one | |
840 | * LEB change may be done at a time. This is ensured by @ubi->alc_mutex. | |
801c135c | 841 | */ |
89b96b69 AB |
842 | int ubi_eba_atomic_leb_change(struct ubi_device *ubi, struct ubi_volume *vol, |
843 | int lnum, const void *buf, int len, int dtype) | |
801c135c | 844 | { |
89b96b69 | 845 | int err, pnum, tries = 0, vol_id = vol->vol_id; |
801c135c AB |
846 | struct ubi_vid_hdr *vid_hdr; |
847 | uint32_t crc; | |
848 | ||
849 | if (ubi->ro_mode) | |
850 | return -EROFS; | |
851 | ||
60c03153 AB |
852 | if (len == 0) { |
853 | /* | |
854 | * Special case when data length is zero. In this case the LEB | |
855 | * has to be unmapped and mapped somewhere else. | |
856 | */ | |
857 | err = ubi_eba_unmap_leb(ubi, vol, lnum); | |
858 | if (err) | |
859 | return err; | |
860 | return ubi_eba_write_leb(ubi, vol, lnum, NULL, 0, 0, dtype); | |
861 | } | |
862 | ||
33818bbb | 863 | vid_hdr = ubi_zalloc_vid_hdr(ubi, GFP_NOFS); |
801c135c AB |
864 | if (!vid_hdr) |
865 | return -ENOMEM; | |
866 | ||
e8823bd6 | 867 | mutex_lock(&ubi->alc_mutex); |
801c135c | 868 | err = leb_write_lock(ubi, vol_id, lnum); |
e8823bd6 AB |
869 | if (err) |
870 | goto out_mutex; | |
801c135c | 871 | |
3261ebd7 CH |
872 | vid_hdr->sqnum = cpu_to_be64(next_sqnum(ubi)); |
873 | vid_hdr->vol_id = cpu_to_be32(vol_id); | |
874 | vid_hdr->lnum = cpu_to_be32(lnum); | |
801c135c | 875 | vid_hdr->compat = ubi_get_compat(ubi, vol_id); |
3261ebd7 | 876 | vid_hdr->data_pad = cpu_to_be32(vol->data_pad); |
801c135c AB |
877 | |
878 | crc = crc32(UBI_CRC32_INIT, buf, len); | |
84a92580 | 879 | vid_hdr->vol_type = UBI_VID_DYNAMIC; |
3261ebd7 | 880 | vid_hdr->data_size = cpu_to_be32(len); |
801c135c | 881 | vid_hdr->copy_flag = 1; |
3261ebd7 | 882 | vid_hdr->data_crc = cpu_to_be32(crc); |
801c135c AB |
883 | |
884 | retry: | |
885 | pnum = ubi_wl_get_peb(ubi, dtype); | |
886 | if (pnum < 0) { | |
e8823bd6 AB |
887 | err = pnum; |
888 | goto out_leb_unlock; | |
801c135c AB |
889 | } |
890 | ||
891 | dbg_eba("change LEB %d:%d, PEB %d, write VID hdr to PEB %d", | |
892 | vol_id, lnum, vol->eba_tbl[lnum], pnum); | |
893 | ||
894 | err = ubi_io_write_vid_hdr(ubi, pnum, vid_hdr); | |
895 | if (err) { | |
896 | ubi_warn("failed to write VID header to LEB %d:%d, PEB %d", | |
897 | vol_id, lnum, pnum); | |
898 | goto write_error; | |
899 | } | |
900 | ||
901 | err = ubi_io_write_data(ubi, buf, pnum, 0, len); | |
902 | if (err) { | |
903 | ubi_warn("failed to write %d bytes of data to PEB %d", | |
904 | len, pnum); | |
905 | goto write_error; | |
906 | } | |
907 | ||
a443db48 | 908 | if (vol->eba_tbl[lnum] >= 0) { |
4d88de4b | 909 | err = ubi_wl_put_peb(ubi, vol->eba_tbl[lnum], 0); |
e8823bd6 AB |
910 | if (err) |
911 | goto out_leb_unlock; | |
801c135c AB |
912 | } |
913 | ||
914 | vol->eba_tbl[lnum] = pnum; | |
e8823bd6 AB |
915 | |
916 | out_leb_unlock: | |
801c135c | 917 | leb_write_unlock(ubi, vol_id, lnum); |
e8823bd6 AB |
918 | out_mutex: |
919 | mutex_unlock(&ubi->alc_mutex); | |
801c135c | 920 | ubi_free_vid_hdr(ubi, vid_hdr); |
e8823bd6 | 921 | return err; |
801c135c AB |
922 | |
923 | write_error: | |
924 | if (err != -EIO || !ubi->bad_allowed) { | |
925 | /* | |
926 | * This flash device does not admit of bad eraseblocks or | |
927 | * something nasty and unexpected happened. Switch to read-only | |
928 | * mode just in case. | |
929 | */ | |
930 | ubi_ro_mode(ubi); | |
e8823bd6 | 931 | goto out_leb_unlock; |
801c135c AB |
932 | } |
933 | ||
934 | err = ubi_wl_put_peb(ubi, pnum, 1); | |
935 | if (err || ++tries > UBI_IO_RETRIES) { | |
936 | ubi_ro_mode(ubi); | |
e8823bd6 | 937 | goto out_leb_unlock; |
801c135c AB |
938 | } |
939 | ||
3261ebd7 | 940 | vid_hdr->sqnum = cpu_to_be64(next_sqnum(ubi)); |
801c135c AB |
941 | ubi_msg("try another PEB"); |
942 | goto retry; | |
943 | } | |
944 | ||
801c135c AB |
945 | /** |
946 | * ubi_eba_copy_leb - copy logical eraseblock. | |
947 | * @ubi: UBI device description object | |
948 | * @from: physical eraseblock number from where to copy | |
949 | * @to: physical eraseblock number where to copy | |
950 | * @vid_hdr: VID header of the @from physical eraseblock | |
951 | * | |
952 | * This function copies logical eraseblock from physical eraseblock @from to | |
953 | * physical eraseblock @to. The @vid_hdr buffer may be changed by this | |
43f9b25a AB |
954 | * function. Returns: |
955 | * o %0 in case of success; | |
956 | * o %1 if the operation was canceled and should be tried later (e.g., | |
957 | * because a bit-flip was detected at the target PEB); | |
958 | * o %2 if the volume is being deleted and this LEB should not be moved. | |
801c135c AB |
959 | */ |
960 | int ubi_eba_copy_leb(struct ubi_device *ubi, int from, int to, | |
961 | struct ubi_vid_hdr *vid_hdr) | |
962 | { | |
43f9b25a | 963 | int err, vol_id, lnum, data_size, aldata_size, idx; |
801c135c AB |
964 | struct ubi_volume *vol; |
965 | uint32_t crc; | |
801c135c | 966 | |
3261ebd7 CH |
967 | vol_id = be32_to_cpu(vid_hdr->vol_id); |
968 | lnum = be32_to_cpu(vid_hdr->lnum); | |
801c135c AB |
969 | |
970 | dbg_eba("copy LEB %d:%d, PEB %d to PEB %d", vol_id, lnum, from, to); | |
971 | ||
972 | if (vid_hdr->vol_type == UBI_VID_STATIC) { | |
3261ebd7 | 973 | data_size = be32_to_cpu(vid_hdr->data_size); |
801c135c AB |
974 | aldata_size = ALIGN(data_size, ubi->min_io_size); |
975 | } else | |
976 | data_size = aldata_size = | |
3261ebd7 | 977 | ubi->leb_size - be32_to_cpu(vid_hdr->data_pad); |
801c135c | 978 | |
801c135c | 979 | idx = vol_id2idx(ubi, vol_id); |
43f9b25a | 980 | spin_lock(&ubi->volumes_lock); |
801c135c | 981 | /* |
43f9b25a AB |
982 | * Note, we may race with volume deletion, which means that the volume |
983 | * this logical eraseblock belongs to might be being deleted. Since the | |
984 | * volume deletion unmaps all the volume's logical eraseblocks, it will | |
985 | * be locked in 'ubi_wl_put_peb()' and wait for the WL worker to finish. | |
801c135c | 986 | */ |
801c135c AB |
987 | vol = ubi->volumes[idx]; |
988 | if (!vol) { | |
43f9b25a AB |
989 | /* No need to do further work, cancel */ |
990 | dbg_eba("volume %d is being removed, cancel", vol_id); | |
801c135c | 991 | spin_unlock(&ubi->volumes_lock); |
43f9b25a | 992 | return 2; |
801c135c | 993 | } |
43f9b25a | 994 | spin_unlock(&ubi->volumes_lock); |
801c135c | 995 | |
43f9b25a AB |
996 | /* |
997 | * We do not want anybody to write to this logical eraseblock while we | |
998 | * are moving it, so lock it. | |
999 | * | |
1000 | * Note, we are using non-waiting locking here, because we cannot sleep | |
1001 | * on the LEB, since it may cause deadlocks. Indeed, imagine a task is | |
1002 | * unmapping the LEB which is mapped to the PEB we are going to move | |
1003 | * (@from). This task locks the LEB and goes sleep in the | |
1004 | * 'ubi_wl_put_peb()' function on the @ubi->move_mutex. In turn, we are | |
1005 | * holding @ubi->move_mutex and go sleep on the LEB lock. So, if the | |
1006 | * LEB is already locked, we just do not move it and return %1. | |
1007 | */ | |
1008 | err = leb_write_trylock(ubi, vol_id, lnum); | |
1009 | if (err) { | |
1010 | dbg_eba("contention on LEB %d:%d, cancel", vol_id, lnum); | |
1011 | return err; | |
801c135c | 1012 | } |
801c135c | 1013 | |
43f9b25a AB |
1014 | /* |
1015 | * The LEB might have been put meanwhile, and the task which put it is | |
1016 | * probably waiting on @ubi->move_mutex. No need to continue the work, | |
1017 | * cancel it. | |
1018 | */ | |
1019 | if (vol->eba_tbl[lnum] != from) { | |
1020 | dbg_eba("LEB %d:%d is no longer mapped to PEB %d, mapped to " | |
1021 | "PEB %d, cancel", vol_id, lnum, from, | |
1022 | vol->eba_tbl[lnum]); | |
1023 | err = 1; | |
1024 | goto out_unlock_leb; | |
1025 | } | |
801c135c | 1026 | |
43f9b25a AB |
1027 | /* |
1028 | * OK, now the LEB is locked and we can safely start moving iy. Since | |
1029 | * this function utilizes thie @ubi->peb1_buf buffer which is shared | |
1030 | * with some other functions, so lock the buffer by taking the | |
1031 | * @ubi->buf_mutex. | |
1032 | */ | |
1033 | mutex_lock(&ubi->buf_mutex); | |
801c135c | 1034 | dbg_eba("read %d bytes of data", aldata_size); |
e88d6e10 | 1035 | err = ubi_io_read_data(ubi, ubi->peb_buf1, from, 0, aldata_size); |
801c135c AB |
1036 | if (err && err != UBI_IO_BITFLIPS) { |
1037 | ubi_warn("error %d while reading data from PEB %d", | |
1038 | err, from); | |
43f9b25a | 1039 | goto out_unlock_buf; |
801c135c AB |
1040 | } |
1041 | ||
1042 | /* | |
1043 | * Now we have got to calculate how much data we have to to copy. In | |
1044 | * case of a static volume it is fairly easy - the VID header contains | |
1045 | * the data size. In case of a dynamic volume it is more difficult - we | |
1046 | * have to read the contents, cut 0xFF bytes from the end and copy only | |
1047 | * the first part. We must do this to avoid writing 0xFF bytes as it | |
1048 | * may have some side-effects. And not only this. It is important not | |
1049 | * to include those 0xFFs to CRC because later the they may be filled | |
1050 | * by data. | |
1051 | */ | |
1052 | if (vid_hdr->vol_type == UBI_VID_DYNAMIC) | |
1053 | aldata_size = data_size = | |
e88d6e10 | 1054 | ubi_calc_data_len(ubi, ubi->peb_buf1, data_size); |
801c135c AB |
1055 | |
1056 | cond_resched(); | |
e88d6e10 | 1057 | crc = crc32(UBI_CRC32_INIT, ubi->peb_buf1, data_size); |
801c135c AB |
1058 | cond_resched(); |
1059 | ||
1060 | /* | |
1061 | * It may turn out to me that the whole @from physical eraseblock | |
1062 | * contains only 0xFF bytes. Then we have to only write the VID header | |
1063 | * and do not write any data. This also means we should not set | |
1064 | * @vid_hdr->copy_flag, @vid_hdr->data_size, and @vid_hdr->data_crc. | |
1065 | */ | |
1066 | if (data_size > 0) { | |
1067 | vid_hdr->copy_flag = 1; | |
3261ebd7 CH |
1068 | vid_hdr->data_size = cpu_to_be32(data_size); |
1069 | vid_hdr->data_crc = cpu_to_be32(crc); | |
801c135c | 1070 | } |
3261ebd7 | 1071 | vid_hdr->sqnum = cpu_to_be64(next_sqnum(ubi)); |
801c135c AB |
1072 | |
1073 | err = ubi_io_write_vid_hdr(ubi, to, vid_hdr); | |
1074 | if (err) | |
43f9b25a | 1075 | goto out_unlock_buf; |
801c135c AB |
1076 | |
1077 | cond_resched(); | |
1078 | ||
1079 | /* Read the VID header back and check if it was written correctly */ | |
1080 | err = ubi_io_read_vid_hdr(ubi, to, vid_hdr, 1); | |
1081 | if (err) { | |
1082 | if (err != UBI_IO_BITFLIPS) | |
1083 | ubi_warn("cannot read VID header back from PEB %d", to); | |
43f9b25a AB |
1084 | else |
1085 | err = 1; | |
1086 | goto out_unlock_buf; | |
801c135c AB |
1087 | } |
1088 | ||
1089 | if (data_size > 0) { | |
e88d6e10 | 1090 | err = ubi_io_write_data(ubi, ubi->peb_buf1, to, 0, aldata_size); |
801c135c | 1091 | if (err) |
43f9b25a | 1092 | goto out_unlock_buf; |
801c135c | 1093 | |
e88d6e10 AB |
1094 | cond_resched(); |
1095 | ||
801c135c AB |
1096 | /* |
1097 | * We've written the data and are going to read it back to make | |
1098 | * sure it was written correctly. | |
1099 | */ | |
801c135c | 1100 | |
e88d6e10 | 1101 | err = ubi_io_read_data(ubi, ubi->peb_buf2, to, 0, aldata_size); |
801c135c AB |
1102 | if (err) { |
1103 | if (err != UBI_IO_BITFLIPS) | |
1104 | ubi_warn("cannot read data back from PEB %d", | |
1105 | to); | |
43f9b25a AB |
1106 | else |
1107 | err = 1; | |
1108 | goto out_unlock_buf; | |
801c135c AB |
1109 | } |
1110 | ||
1111 | cond_resched(); | |
1112 | ||
e88d6e10 | 1113 | if (memcmp(ubi->peb_buf1, ubi->peb_buf2, aldata_size)) { |
801c135c AB |
1114 | ubi_warn("read data back from PEB %d - it is different", |
1115 | to); | |
43f9b25a | 1116 | goto out_unlock_buf; |
801c135c AB |
1117 | } |
1118 | } | |
1119 | ||
1120 | ubi_assert(vol->eba_tbl[lnum] == from); | |
1121 | vol->eba_tbl[lnum] = to; | |
1122 | ||
43f9b25a | 1123 | out_unlock_buf: |
e88d6e10 | 1124 | mutex_unlock(&ubi->buf_mutex); |
43f9b25a | 1125 | out_unlock_leb: |
801c135c | 1126 | leb_write_unlock(ubi, vol_id, lnum); |
801c135c AB |
1127 | return err; |
1128 | } | |
1129 | ||
1130 | /** | |
85c6e6e2 | 1131 | * ubi_eba_init_scan - initialize the EBA sub-system using scanning information. |
801c135c AB |
1132 | * @ubi: UBI device description object |
1133 | * @si: scanning information | |
1134 | * | |
1135 | * This function returns zero in case of success and a negative error code in | |
1136 | * case of failure. | |
1137 | */ | |
1138 | int ubi_eba_init_scan(struct ubi_device *ubi, struct ubi_scan_info *si) | |
1139 | { | |
1140 | int i, j, err, num_volumes; | |
1141 | struct ubi_scan_volume *sv; | |
1142 | struct ubi_volume *vol; | |
1143 | struct ubi_scan_leb *seb; | |
1144 | struct rb_node *rb; | |
1145 | ||
85c6e6e2 | 1146 | dbg_eba("initialize EBA sub-system"); |
801c135c AB |
1147 | |
1148 | spin_lock_init(&ubi->ltree_lock); | |
e8823bd6 | 1149 | mutex_init(&ubi->alc_mutex); |
801c135c AB |
1150 | ubi->ltree = RB_ROOT; |
1151 | ||
801c135c AB |
1152 | ubi->global_sqnum = si->max_sqnum + 1; |
1153 | num_volumes = ubi->vtbl_slots + UBI_INT_VOL_COUNT; | |
1154 | ||
1155 | for (i = 0; i < num_volumes; i++) { | |
1156 | vol = ubi->volumes[i]; | |
1157 | if (!vol) | |
1158 | continue; | |
1159 | ||
1160 | cond_resched(); | |
1161 | ||
1162 | vol->eba_tbl = kmalloc(vol->reserved_pebs * sizeof(int), | |
1163 | GFP_KERNEL); | |
1164 | if (!vol->eba_tbl) { | |
1165 | err = -ENOMEM; | |
1166 | goto out_free; | |
1167 | } | |
1168 | ||
1169 | for (j = 0; j < vol->reserved_pebs; j++) | |
1170 | vol->eba_tbl[j] = UBI_LEB_UNMAPPED; | |
1171 | ||
1172 | sv = ubi_scan_find_sv(si, idx2vol_id(ubi, i)); | |
1173 | if (!sv) | |
1174 | continue; | |
1175 | ||
1176 | ubi_rb_for_each_entry(rb, seb, &sv->root, u.rb) { | |
1177 | if (seb->lnum >= vol->reserved_pebs) | |
1178 | /* | |
1179 | * This may happen in case of an unclean reboot | |
1180 | * during re-size. | |
1181 | */ | |
1182 | ubi_scan_move_to_list(sv, seb, &si->erase); | |
1183 | vol->eba_tbl[seb->lnum] = seb->pnum; | |
1184 | } | |
1185 | } | |
1186 | ||
94780d4d AB |
1187 | if (ubi->avail_pebs < EBA_RESERVED_PEBS) { |
1188 | ubi_err("no enough physical eraseblocks (%d, need %d)", | |
1189 | ubi->avail_pebs, EBA_RESERVED_PEBS); | |
1190 | err = -ENOSPC; | |
1191 | goto out_free; | |
1192 | } | |
1193 | ubi->avail_pebs -= EBA_RESERVED_PEBS; | |
1194 | ubi->rsvd_pebs += EBA_RESERVED_PEBS; | |
1195 | ||
801c135c AB |
1196 | if (ubi->bad_allowed) { |
1197 | ubi_calculate_reserved(ubi); | |
1198 | ||
1199 | if (ubi->avail_pebs < ubi->beb_rsvd_level) { | |
1200 | /* No enough free physical eraseblocks */ | |
1201 | ubi->beb_rsvd_pebs = ubi->avail_pebs; | |
1202 | ubi_warn("cannot reserve enough PEBs for bad PEB " | |
1203 | "handling, reserved %d, need %d", | |
1204 | ubi->beb_rsvd_pebs, ubi->beb_rsvd_level); | |
1205 | } else | |
1206 | ubi->beb_rsvd_pebs = ubi->beb_rsvd_level; | |
1207 | ||
1208 | ubi->avail_pebs -= ubi->beb_rsvd_pebs; | |
1209 | ubi->rsvd_pebs += ubi->beb_rsvd_pebs; | |
1210 | } | |
1211 | ||
85c6e6e2 | 1212 | dbg_eba("EBA sub-system is initialized"); |
801c135c AB |
1213 | return 0; |
1214 | ||
1215 | out_free: | |
1216 | for (i = 0; i < num_volumes; i++) { | |
1217 | if (!ubi->volumes[i]) | |
1218 | continue; | |
1219 | kfree(ubi->volumes[i]->eba_tbl); | |
1220 | } | |
801c135c AB |
1221 | return err; |
1222 | } |