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 | ||
9c9ec147 | 192 | kfree(le_free); |
801c135c AB |
193 | return le; |
194 | } | |
195 | ||
196 | /** | |
197 | * leb_read_lock - lock logical eraseblock for reading. | |
198 | * @ubi: UBI device description object | |
199 | * @vol_id: volume ID | |
200 | * @lnum: logical eraseblock number | |
201 | * | |
202 | * This function locks a logical eraseblock for reading. Returns zero in case | |
203 | * of success and a negative error code in case of failure. | |
204 | */ | |
205 | static int leb_read_lock(struct ubi_device *ubi, int vol_id, int lnum) | |
206 | { | |
3a8d4642 | 207 | struct ubi_ltree_entry *le; |
801c135c AB |
208 | |
209 | le = ltree_add_entry(ubi, vol_id, lnum); | |
210 | if (IS_ERR(le)) | |
211 | return PTR_ERR(le); | |
212 | down_read(&le->mutex); | |
213 | return 0; | |
214 | } | |
215 | ||
216 | /** | |
217 | * leb_read_unlock - unlock logical eraseblock. | |
218 | * @ubi: UBI device description object | |
219 | * @vol_id: volume ID | |
220 | * @lnum: logical eraseblock number | |
221 | */ | |
222 | static void leb_read_unlock(struct ubi_device *ubi, int vol_id, int lnum) | |
223 | { | |
3a8d4642 | 224 | struct ubi_ltree_entry *le; |
801c135c AB |
225 | |
226 | spin_lock(&ubi->ltree_lock); | |
227 | le = ltree_lookup(ubi, vol_id, lnum); | |
228 | le->users -= 1; | |
229 | ubi_assert(le->users >= 0); | |
23add745 | 230 | up_read(&le->mutex); |
801c135c AB |
231 | if (le->users == 0) { |
232 | rb_erase(&le->rb, &ubi->ltree); | |
23add745 | 233 | kfree(le); |
801c135c AB |
234 | } |
235 | spin_unlock(&ubi->ltree_lock); | |
801c135c AB |
236 | } |
237 | ||
238 | /** | |
239 | * leb_write_lock - lock logical eraseblock for writing. | |
240 | * @ubi: UBI device description object | |
241 | * @vol_id: volume ID | |
242 | * @lnum: logical eraseblock number | |
243 | * | |
244 | * This function locks a logical eraseblock for writing. Returns zero in case | |
245 | * of success and a negative error code in case of failure. | |
246 | */ | |
247 | static int leb_write_lock(struct ubi_device *ubi, int vol_id, int lnum) | |
248 | { | |
3a8d4642 | 249 | struct ubi_ltree_entry *le; |
801c135c AB |
250 | |
251 | le = ltree_add_entry(ubi, vol_id, lnum); | |
252 | if (IS_ERR(le)) | |
253 | return PTR_ERR(le); | |
254 | down_write(&le->mutex); | |
255 | return 0; | |
256 | } | |
257 | ||
43f9b25a AB |
258 | /** |
259 | * leb_write_lock - lock logical eraseblock for writing. | |
260 | * @ubi: UBI device description object | |
261 | * @vol_id: volume ID | |
262 | * @lnum: logical eraseblock number | |
263 | * | |
264 | * This function locks a logical eraseblock for writing if there is no | |
265 | * contention and does nothing if there is contention. Returns %0 in case of | |
266 | * success, %1 in case of contention, and and a negative error code in case of | |
267 | * failure. | |
268 | */ | |
269 | static int leb_write_trylock(struct ubi_device *ubi, int vol_id, int lnum) | |
270 | { | |
43f9b25a AB |
271 | struct ubi_ltree_entry *le; |
272 | ||
273 | le = ltree_add_entry(ubi, vol_id, lnum); | |
274 | if (IS_ERR(le)) | |
275 | return PTR_ERR(le); | |
276 | if (down_write_trylock(&le->mutex)) | |
277 | return 0; | |
278 | ||
279 | /* Contention, cancel */ | |
280 | spin_lock(&ubi->ltree_lock); | |
281 | le->users -= 1; | |
282 | ubi_assert(le->users >= 0); | |
283 | if (le->users == 0) { | |
284 | rb_erase(&le->rb, &ubi->ltree); | |
b9a06623 | 285 | kfree(le); |
23add745 AB |
286 | } |
287 | spin_unlock(&ubi->ltree_lock); | |
43f9b25a AB |
288 | |
289 | return 1; | |
290 | } | |
291 | ||
801c135c AB |
292 | /** |
293 | * leb_write_unlock - unlock logical eraseblock. | |
294 | * @ubi: UBI device description object | |
295 | * @vol_id: volume ID | |
296 | * @lnum: logical eraseblock number | |
297 | */ | |
298 | static void leb_write_unlock(struct ubi_device *ubi, int vol_id, int lnum) | |
299 | { | |
3a8d4642 | 300 | struct ubi_ltree_entry *le; |
801c135c AB |
301 | |
302 | spin_lock(&ubi->ltree_lock); | |
303 | le = ltree_lookup(ubi, vol_id, lnum); | |
304 | le->users -= 1; | |
305 | ubi_assert(le->users >= 0); | |
23add745 | 306 | up_write(&le->mutex); |
801c135c AB |
307 | if (le->users == 0) { |
308 | rb_erase(&le->rb, &ubi->ltree); | |
b9a06623 | 309 | kfree(le); |
23add745 AB |
310 | } |
311 | spin_unlock(&ubi->ltree_lock); | |
801c135c AB |
312 | } |
313 | ||
314 | /** | |
315 | * ubi_eba_unmap_leb - un-map logical eraseblock. | |
316 | * @ubi: UBI device description object | |
89b96b69 | 317 | * @vol: volume description object |
801c135c AB |
318 | * @lnum: logical eraseblock number |
319 | * | |
320 | * This function un-maps logical eraseblock @lnum and schedules corresponding | |
321 | * physical eraseblock for erasure. Returns zero in case of success and a | |
322 | * negative error code in case of failure. | |
323 | */ | |
89b96b69 AB |
324 | int ubi_eba_unmap_leb(struct ubi_device *ubi, struct ubi_volume *vol, |
325 | int lnum) | |
801c135c | 326 | { |
89b96b69 | 327 | int err, pnum, vol_id = vol->vol_id; |
801c135c AB |
328 | |
329 | if (ubi->ro_mode) | |
330 | return -EROFS; | |
331 | ||
332 | err = leb_write_lock(ubi, vol_id, lnum); | |
333 | if (err) | |
334 | return err; | |
335 | ||
336 | pnum = vol->eba_tbl[lnum]; | |
337 | if (pnum < 0) | |
338 | /* This logical eraseblock is already unmapped */ | |
339 | goto out_unlock; | |
340 | ||
341 | dbg_eba("erase LEB %d:%d, PEB %d", vol_id, lnum, pnum); | |
342 | ||
343 | vol->eba_tbl[lnum] = UBI_LEB_UNMAPPED; | |
344 | err = ubi_wl_put_peb(ubi, pnum, 0); | |
345 | ||
346 | out_unlock: | |
347 | leb_write_unlock(ubi, vol_id, lnum); | |
348 | return err; | |
349 | } | |
350 | ||
351 | /** | |
352 | * ubi_eba_read_leb - read data. | |
353 | * @ubi: UBI device description object | |
89b96b69 | 354 | * @vol: volume description object |
801c135c AB |
355 | * @lnum: logical eraseblock number |
356 | * @buf: buffer to store the read data | |
357 | * @offset: offset from where to read | |
358 | * @len: how many bytes to read | |
359 | * @check: data CRC check flag | |
360 | * | |
361 | * If the logical eraseblock @lnum is unmapped, @buf is filled with 0xFF | |
362 | * bytes. The @check flag only makes sense for static volumes and forces | |
363 | * eraseblock data CRC checking. | |
364 | * | |
365 | * In case of success this function returns zero. In case of a static volume, | |
366 | * if data CRC mismatches - %-EBADMSG is returned. %-EBADMSG may also be | |
367 | * returned for any volume type if an ECC error was detected by the MTD device | |
368 | * driver. Other negative error cored may be returned in case of other errors. | |
369 | */ | |
89b96b69 AB |
370 | int ubi_eba_read_leb(struct ubi_device *ubi, struct ubi_volume *vol, int lnum, |
371 | void *buf, int offset, int len, int check) | |
801c135c | 372 | { |
89b96b69 | 373 | int err, pnum, scrub = 0, vol_id = vol->vol_id; |
801c135c | 374 | struct ubi_vid_hdr *vid_hdr; |
a6343afb | 375 | uint32_t uninitialized_var(crc); |
801c135c AB |
376 | |
377 | err = leb_read_lock(ubi, vol_id, lnum); | |
378 | if (err) | |
379 | return err; | |
380 | ||
381 | pnum = vol->eba_tbl[lnum]; | |
382 | if (pnum < 0) { | |
383 | /* | |
384 | * The logical eraseblock is not mapped, fill the whole buffer | |
385 | * with 0xFF bytes. The exception is static volumes for which | |
386 | * it is an error to read unmapped logical eraseblocks. | |
387 | */ | |
388 | dbg_eba("read %d bytes from offset %d of LEB %d:%d (unmapped)", | |
389 | len, offset, vol_id, lnum); | |
390 | leb_read_unlock(ubi, vol_id, lnum); | |
391 | ubi_assert(vol->vol_type != UBI_STATIC_VOLUME); | |
392 | memset(buf, 0xFF, len); | |
393 | return 0; | |
394 | } | |
395 | ||
396 | dbg_eba("read %d bytes from offset %d of LEB %d:%d, PEB %d", | |
397 | len, offset, vol_id, lnum, pnum); | |
398 | ||
399 | if (vol->vol_type == UBI_DYNAMIC_VOLUME) | |
400 | check = 0; | |
401 | ||
402 | retry: | |
403 | if (check) { | |
33818bbb | 404 | vid_hdr = ubi_zalloc_vid_hdr(ubi, GFP_NOFS); |
801c135c AB |
405 | if (!vid_hdr) { |
406 | err = -ENOMEM; | |
407 | goto out_unlock; | |
408 | } | |
409 | ||
410 | err = ubi_io_read_vid_hdr(ubi, pnum, vid_hdr, 1); | |
411 | if (err && err != UBI_IO_BITFLIPS) { | |
412 | if (err > 0) { | |
413 | /* | |
414 | * The header is either absent or corrupted. | |
415 | * The former case means there is a bug - | |
416 | * switch to read-only mode just in case. | |
417 | * The latter case means a real corruption - we | |
418 | * may try to recover data. FIXME: but this is | |
419 | * not implemented. | |
420 | */ | |
421 | if (err == UBI_IO_BAD_VID_HDR) { | |
422 | ubi_warn("bad VID header at PEB %d, LEB" | |
423 | "%d:%d", pnum, vol_id, lnum); | |
424 | err = -EBADMSG; | |
425 | } else | |
426 | ubi_ro_mode(ubi); | |
427 | } | |
428 | goto out_free; | |
429 | } else if (err == UBI_IO_BITFLIPS) | |
430 | scrub = 1; | |
431 | ||
3261ebd7 CH |
432 | ubi_assert(lnum < be32_to_cpu(vid_hdr->used_ebs)); |
433 | ubi_assert(len == be32_to_cpu(vid_hdr->data_size)); | |
801c135c | 434 | |
3261ebd7 | 435 | crc = be32_to_cpu(vid_hdr->data_crc); |
801c135c AB |
436 | ubi_free_vid_hdr(ubi, vid_hdr); |
437 | } | |
438 | ||
439 | err = ubi_io_read_data(ubi, buf, pnum, offset, len); | |
440 | if (err) { | |
441 | if (err == UBI_IO_BITFLIPS) { | |
442 | scrub = 1; | |
443 | err = 0; | |
444 | } else if (err == -EBADMSG) { | |
445 | if (vol->vol_type == UBI_DYNAMIC_VOLUME) | |
446 | goto out_unlock; | |
447 | scrub = 1; | |
448 | if (!check) { | |
449 | ubi_msg("force data checking"); | |
450 | check = 1; | |
451 | goto retry; | |
452 | } | |
453 | } else | |
454 | goto out_unlock; | |
455 | } | |
456 | ||
457 | if (check) { | |
2ab934b8 | 458 | uint32_t crc1 = crc32(UBI_CRC32_INIT, buf, len); |
801c135c AB |
459 | if (crc1 != crc) { |
460 | ubi_warn("CRC error: calculated %#08x, must be %#08x", | |
461 | crc1, crc); | |
462 | err = -EBADMSG; | |
463 | goto out_unlock; | |
464 | } | |
465 | } | |
466 | ||
467 | if (scrub) | |
468 | err = ubi_wl_scrub_peb(ubi, pnum); | |
469 | ||
470 | leb_read_unlock(ubi, vol_id, lnum); | |
471 | return err; | |
472 | ||
473 | out_free: | |
474 | ubi_free_vid_hdr(ubi, vid_hdr); | |
475 | out_unlock: | |
476 | leb_read_unlock(ubi, vol_id, lnum); | |
477 | return err; | |
478 | } | |
479 | ||
480 | /** | |
481 | * recover_peb - recover from write failure. | |
482 | * @ubi: UBI device description object | |
483 | * @pnum: the physical eraseblock to recover | |
484 | * @vol_id: volume ID | |
485 | * @lnum: logical eraseblock number | |
486 | * @buf: data which was not written because of the write failure | |
487 | * @offset: offset of the failed write | |
488 | * @len: how many bytes should have been written | |
489 | * | |
490 | * This function is called in case of a write failure and moves all good data | |
491 | * from the potentially bad physical eraseblock to a good physical eraseblock. | |
492 | * This function also writes the data which was not written due to the failure. | |
493 | * Returns new physical eraseblock number in case of success, and a negative | |
494 | * error code in case of failure. | |
495 | */ | |
496 | static int recover_peb(struct ubi_device *ubi, int pnum, int vol_id, int lnum, | |
497 | const void *buf, int offset, int len) | |
498 | { | |
499 | int err, idx = vol_id2idx(ubi, vol_id), new_pnum, data_size, tries = 0; | |
500 | struct ubi_volume *vol = ubi->volumes[idx]; | |
501 | struct ubi_vid_hdr *vid_hdr; | |
801c135c | 502 | |
33818bbb | 503 | vid_hdr = ubi_zalloc_vid_hdr(ubi, GFP_NOFS); |
9c9ec147 | 504 | if (!vid_hdr) |
801c135c | 505 | return -ENOMEM; |
801c135c AB |
506 | |
507 | retry: | |
508 | new_pnum = ubi_wl_get_peb(ubi, UBI_UNKNOWN); | |
509 | if (new_pnum < 0) { | |
510 | ubi_free_vid_hdr(ubi, vid_hdr); | |
511 | return new_pnum; | |
512 | } | |
513 | ||
514 | ubi_msg("recover PEB %d, move data to PEB %d", pnum, new_pnum); | |
515 | ||
516 | err = ubi_io_read_vid_hdr(ubi, pnum, vid_hdr, 1); | |
517 | if (err && err != UBI_IO_BITFLIPS) { | |
518 | if (err > 0) | |
519 | err = -EIO; | |
520 | goto out_put; | |
521 | } | |
522 | ||
3261ebd7 | 523 | vid_hdr->sqnum = cpu_to_be64(next_sqnum(ubi)); |
801c135c AB |
524 | err = ubi_io_write_vid_hdr(ubi, new_pnum, vid_hdr); |
525 | if (err) | |
526 | goto write_error; | |
527 | ||
528 | data_size = offset + len; | |
4df581f3 | 529 | mutex_lock(&ubi->buf_mutex); |
e88d6e10 | 530 | memset(ubi->peb_buf1 + offset, 0xFF, len); |
801c135c AB |
531 | |
532 | /* Read everything before the area where the write failure happened */ | |
533 | if (offset > 0) { | |
e88d6e10 AB |
534 | err = ubi_io_read_data(ubi, ubi->peb_buf1, pnum, 0, offset); |
535 | if (err && err != UBI_IO_BITFLIPS) | |
4df581f3 | 536 | goto out_unlock; |
801c135c AB |
537 | } |
538 | ||
e88d6e10 | 539 | memcpy(ubi->peb_buf1 + offset, buf, len); |
801c135c | 540 | |
e88d6e10 | 541 | err = ubi_io_write_data(ubi, ubi->peb_buf1, new_pnum, 0, data_size); |
4df581f3 AB |
542 | if (err) { |
543 | mutex_unlock(&ubi->buf_mutex); | |
801c135c | 544 | goto write_error; |
4df581f3 | 545 | } |
801c135c | 546 | |
e88d6e10 | 547 | mutex_unlock(&ubi->buf_mutex); |
801c135c AB |
548 | ubi_free_vid_hdr(ubi, vid_hdr); |
549 | ||
550 | vol->eba_tbl[lnum] = new_pnum; | |
551 | ubi_wl_put_peb(ubi, pnum, 1); | |
552 | ||
553 | ubi_msg("data was successfully recovered"); | |
554 | return 0; | |
555 | ||
4df581f3 | 556 | out_unlock: |
e88d6e10 | 557 | mutex_unlock(&ubi->buf_mutex); |
4df581f3 | 558 | out_put: |
801c135c AB |
559 | ubi_wl_put_peb(ubi, new_pnum, 1); |
560 | ubi_free_vid_hdr(ubi, vid_hdr); | |
561 | return err; | |
562 | ||
563 | write_error: | |
564 | /* | |
565 | * Bad luck? This physical eraseblock is bad too? Crud. Let's try to | |
566 | * get another one. | |
567 | */ | |
568 | ubi_warn("failed to write to PEB %d", new_pnum); | |
569 | ubi_wl_put_peb(ubi, new_pnum, 1); | |
570 | if (++tries > UBI_IO_RETRIES) { | |
571 | ubi_free_vid_hdr(ubi, vid_hdr); | |
572 | return err; | |
573 | } | |
574 | ubi_msg("try again"); | |
575 | goto retry; | |
576 | } | |
577 | ||
578 | /** | |
579 | * ubi_eba_write_leb - write data to dynamic volume. | |
580 | * @ubi: UBI device description object | |
89b96b69 | 581 | * @vol: volume description object |
801c135c AB |
582 | * @lnum: logical eraseblock number |
583 | * @buf: the data to write | |
584 | * @offset: offset within the logical eraseblock where to write | |
585 | * @len: how many bytes to write | |
586 | * @dtype: data type | |
587 | * | |
588 | * This function writes data to logical eraseblock @lnum of a dynamic volume | |
89b96b69 | 589 | * @vol. Returns zero in case of success and a negative error code in case |
801c135c AB |
590 | * of failure. In case of error, it is possible that something was still |
591 | * written to the flash media, but may be some garbage. | |
592 | */ | |
89b96b69 | 593 | int ubi_eba_write_leb(struct ubi_device *ubi, struct ubi_volume *vol, int lnum, |
801c135c AB |
594 | const void *buf, int offset, int len, int dtype) |
595 | { | |
89b96b69 | 596 | int err, pnum, tries = 0, vol_id = vol->vol_id; |
801c135c AB |
597 | struct ubi_vid_hdr *vid_hdr; |
598 | ||
599 | if (ubi->ro_mode) | |
600 | return -EROFS; | |
601 | ||
602 | err = leb_write_lock(ubi, vol_id, lnum); | |
603 | if (err) | |
604 | return err; | |
605 | ||
606 | pnum = vol->eba_tbl[lnum]; | |
607 | if (pnum >= 0) { | |
608 | dbg_eba("write %d bytes at offset %d of LEB %d:%d, PEB %d", | |
609 | len, offset, vol_id, lnum, pnum); | |
610 | ||
611 | err = ubi_io_write_data(ubi, buf, pnum, offset, len); | |
612 | if (err) { | |
613 | ubi_warn("failed to write data to PEB %d", pnum); | |
614 | if (err == -EIO && ubi->bad_allowed) | |
89b96b69 AB |
615 | err = recover_peb(ubi, pnum, vol_id, lnum, buf, |
616 | offset, len); | |
801c135c AB |
617 | if (err) |
618 | ubi_ro_mode(ubi); | |
619 | } | |
620 | leb_write_unlock(ubi, vol_id, lnum); | |
621 | return err; | |
622 | } | |
623 | ||
624 | /* | |
625 | * The logical eraseblock is not mapped. We have to get a free physical | |
626 | * eraseblock and write the volume identifier header there first. | |
627 | */ | |
33818bbb | 628 | vid_hdr = ubi_zalloc_vid_hdr(ubi, GFP_NOFS); |
801c135c AB |
629 | if (!vid_hdr) { |
630 | leb_write_unlock(ubi, vol_id, lnum); | |
631 | return -ENOMEM; | |
632 | } | |
633 | ||
634 | vid_hdr->vol_type = UBI_VID_DYNAMIC; | |
3261ebd7 CH |
635 | vid_hdr->sqnum = cpu_to_be64(next_sqnum(ubi)); |
636 | vid_hdr->vol_id = cpu_to_be32(vol_id); | |
637 | vid_hdr->lnum = cpu_to_be32(lnum); | |
801c135c | 638 | vid_hdr->compat = ubi_get_compat(ubi, vol_id); |
3261ebd7 | 639 | vid_hdr->data_pad = cpu_to_be32(vol->data_pad); |
801c135c AB |
640 | |
641 | retry: | |
642 | pnum = ubi_wl_get_peb(ubi, dtype); | |
643 | if (pnum < 0) { | |
644 | ubi_free_vid_hdr(ubi, vid_hdr); | |
645 | leb_write_unlock(ubi, vol_id, lnum); | |
646 | return pnum; | |
647 | } | |
648 | ||
649 | dbg_eba("write VID hdr and %d bytes at offset %d of LEB %d:%d, PEB %d", | |
650 | len, offset, vol_id, lnum, pnum); | |
651 | ||
652 | err = ubi_io_write_vid_hdr(ubi, pnum, vid_hdr); | |
653 | if (err) { | |
654 | ubi_warn("failed to write VID header to LEB %d:%d, PEB %d", | |
655 | vol_id, lnum, pnum); | |
656 | goto write_error; | |
657 | } | |
658 | ||
393852ec AB |
659 | if (len) { |
660 | err = ubi_io_write_data(ubi, buf, pnum, offset, len); | |
661 | if (err) { | |
662 | ubi_warn("failed to write %d bytes at offset %d of " | |
663 | "LEB %d:%d, PEB %d", len, offset, vol_id, | |
664 | lnum, pnum); | |
665 | goto write_error; | |
666 | } | |
801c135c AB |
667 | } |
668 | ||
669 | vol->eba_tbl[lnum] = pnum; | |
670 | ||
671 | leb_write_unlock(ubi, vol_id, lnum); | |
672 | ubi_free_vid_hdr(ubi, vid_hdr); | |
673 | return 0; | |
674 | ||
675 | write_error: | |
676 | if (err != -EIO || !ubi->bad_allowed) { | |
677 | ubi_ro_mode(ubi); | |
678 | leb_write_unlock(ubi, vol_id, lnum); | |
679 | ubi_free_vid_hdr(ubi, vid_hdr); | |
680 | return err; | |
681 | } | |
682 | ||
683 | /* | |
684 | * Fortunately, this is the first write operation to this physical | |
685 | * eraseblock, so just put it and request a new one. We assume that if | |
686 | * this physical eraseblock went bad, the erase code will handle that. | |
687 | */ | |
688 | err = ubi_wl_put_peb(ubi, pnum, 1); | |
689 | if (err || ++tries > UBI_IO_RETRIES) { | |
690 | ubi_ro_mode(ubi); | |
691 | leb_write_unlock(ubi, vol_id, lnum); | |
692 | ubi_free_vid_hdr(ubi, vid_hdr); | |
693 | return err; | |
694 | } | |
695 | ||
3261ebd7 | 696 | vid_hdr->sqnum = cpu_to_be64(next_sqnum(ubi)); |
801c135c AB |
697 | ubi_msg("try another PEB"); |
698 | goto retry; | |
699 | } | |
700 | ||
701 | /** | |
702 | * ubi_eba_write_leb_st - write data to static volume. | |
703 | * @ubi: UBI device description object | |
89b96b69 | 704 | * @vol: volume description object |
801c135c AB |
705 | * @lnum: logical eraseblock number |
706 | * @buf: data to write | |
707 | * @len: how many bytes to write | |
708 | * @dtype: data type | |
709 | * @used_ebs: how many logical eraseblocks will this volume contain | |
710 | * | |
711 | * This function writes data to logical eraseblock @lnum of static volume | |
89b96b69 | 712 | * @vol. The @used_ebs argument should contain total number of logical |
801c135c AB |
713 | * eraseblock in this static volume. |
714 | * | |
715 | * When writing to the last logical eraseblock, the @len argument doesn't have | |
716 | * to be aligned to the minimal I/O unit size. Instead, it has to be equivalent | |
717 | * to the real data size, although the @buf buffer has to contain the | |
718 | * alignment. In all other cases, @len has to be aligned. | |
719 | * | |
720 | * It is prohibited to write more then once to logical eraseblocks of static | |
721 | * volumes. This function returns zero in case of success and a negative error | |
722 | * code in case of failure. | |
723 | */ | |
89b96b69 AB |
724 | int ubi_eba_write_leb_st(struct ubi_device *ubi, struct ubi_volume *vol, |
725 | int lnum, const void *buf, int len, int dtype, | |
726 | int used_ebs) | |
801c135c | 727 | { |
89b96b69 | 728 | int err, pnum, tries = 0, data_size = len, vol_id = vol->vol_id; |
801c135c AB |
729 | struct ubi_vid_hdr *vid_hdr; |
730 | uint32_t crc; | |
731 | ||
732 | if (ubi->ro_mode) | |
733 | return -EROFS; | |
734 | ||
735 | if (lnum == used_ebs - 1) | |
736 | /* If this is the last LEB @len may be unaligned */ | |
737 | len = ALIGN(data_size, ubi->min_io_size); | |
738 | else | |
cadb40cc | 739 | ubi_assert(!(len & (ubi->min_io_size - 1))); |
801c135c | 740 | |
33818bbb | 741 | vid_hdr = ubi_zalloc_vid_hdr(ubi, GFP_NOFS); |
801c135c AB |
742 | if (!vid_hdr) |
743 | return -ENOMEM; | |
744 | ||
745 | err = leb_write_lock(ubi, vol_id, lnum); | |
746 | if (err) { | |
747 | ubi_free_vid_hdr(ubi, vid_hdr); | |
748 | return err; | |
749 | } | |
750 | ||
3261ebd7 CH |
751 | vid_hdr->sqnum = cpu_to_be64(next_sqnum(ubi)); |
752 | vid_hdr->vol_id = cpu_to_be32(vol_id); | |
753 | vid_hdr->lnum = cpu_to_be32(lnum); | |
801c135c | 754 | vid_hdr->compat = ubi_get_compat(ubi, vol_id); |
3261ebd7 | 755 | vid_hdr->data_pad = cpu_to_be32(vol->data_pad); |
801c135c AB |
756 | |
757 | crc = crc32(UBI_CRC32_INIT, buf, data_size); | |
758 | vid_hdr->vol_type = UBI_VID_STATIC; | |
3261ebd7 CH |
759 | vid_hdr->data_size = cpu_to_be32(data_size); |
760 | vid_hdr->used_ebs = cpu_to_be32(used_ebs); | |
761 | vid_hdr->data_crc = cpu_to_be32(crc); | |
801c135c AB |
762 | |
763 | retry: | |
764 | pnum = ubi_wl_get_peb(ubi, dtype); | |
765 | if (pnum < 0) { | |
766 | ubi_free_vid_hdr(ubi, vid_hdr); | |
767 | leb_write_unlock(ubi, vol_id, lnum); | |
768 | return pnum; | |
769 | } | |
770 | ||
771 | dbg_eba("write VID hdr and %d bytes at LEB %d:%d, PEB %d, used_ebs %d", | |
772 | len, vol_id, lnum, pnum, used_ebs); | |
773 | ||
774 | err = ubi_io_write_vid_hdr(ubi, pnum, vid_hdr); | |
775 | if (err) { | |
776 | ubi_warn("failed to write VID header to LEB %d:%d, PEB %d", | |
777 | vol_id, lnum, pnum); | |
778 | goto write_error; | |
779 | } | |
780 | ||
781 | err = ubi_io_write_data(ubi, buf, pnum, 0, len); | |
782 | if (err) { | |
783 | ubi_warn("failed to write %d bytes of data to PEB %d", | |
784 | len, pnum); | |
785 | goto write_error; | |
786 | } | |
787 | ||
788 | ubi_assert(vol->eba_tbl[lnum] < 0); | |
789 | vol->eba_tbl[lnum] = pnum; | |
790 | ||
791 | leb_write_unlock(ubi, vol_id, lnum); | |
792 | ubi_free_vid_hdr(ubi, vid_hdr); | |
793 | return 0; | |
794 | ||
795 | write_error: | |
796 | if (err != -EIO || !ubi->bad_allowed) { | |
797 | /* | |
798 | * This flash device does not admit of bad eraseblocks or | |
799 | * something nasty and unexpected happened. Switch to read-only | |
800 | * mode just in case. | |
801 | */ | |
802 | ubi_ro_mode(ubi); | |
803 | leb_write_unlock(ubi, vol_id, lnum); | |
804 | ubi_free_vid_hdr(ubi, vid_hdr); | |
805 | return err; | |
806 | } | |
807 | ||
808 | err = ubi_wl_put_peb(ubi, pnum, 1); | |
809 | if (err || ++tries > UBI_IO_RETRIES) { | |
810 | ubi_ro_mode(ubi); | |
811 | leb_write_unlock(ubi, vol_id, lnum); | |
812 | ubi_free_vid_hdr(ubi, vid_hdr); | |
813 | return err; | |
814 | } | |
815 | ||
3261ebd7 | 816 | vid_hdr->sqnum = cpu_to_be64(next_sqnum(ubi)); |
801c135c AB |
817 | ubi_msg("try another PEB"); |
818 | goto retry; | |
819 | } | |
820 | ||
821 | /* | |
822 | * ubi_eba_atomic_leb_change - change logical eraseblock atomically. | |
823 | * @ubi: UBI device description object | |
c63a491d | 824 | * @vol: volume description object |
801c135c AB |
825 | * @lnum: logical eraseblock number |
826 | * @buf: data to write | |
827 | * @len: how many bytes to write | |
828 | * @dtype: data type | |
829 | * | |
830 | * This function changes the contents of a logical eraseblock atomically. @buf | |
831 | * has to contain new logical eraseblock data, and @len - the length of the | |
832 | * data, which has to be aligned. This function guarantees that in case of an | |
833 | * unclean reboot the old contents is preserved. Returns zero in case of | |
834 | * success and a negative error code in case of failure. | |
e8823bd6 AB |
835 | * |
836 | * UBI reserves one LEB for the "atomic LEB change" operation, so only one | |
837 | * LEB change may be done at a time. This is ensured by @ubi->alc_mutex. | |
801c135c | 838 | */ |
89b96b69 AB |
839 | int ubi_eba_atomic_leb_change(struct ubi_device *ubi, struct ubi_volume *vol, |
840 | int lnum, const void *buf, int len, int dtype) | |
801c135c | 841 | { |
89b96b69 | 842 | int err, pnum, tries = 0, vol_id = vol->vol_id; |
801c135c AB |
843 | struct ubi_vid_hdr *vid_hdr; |
844 | uint32_t crc; | |
845 | ||
846 | if (ubi->ro_mode) | |
847 | return -EROFS; | |
848 | ||
60c03153 AB |
849 | if (len == 0) { |
850 | /* | |
851 | * Special case when data length is zero. In this case the LEB | |
852 | * has to be unmapped and mapped somewhere else. | |
853 | */ | |
854 | err = ubi_eba_unmap_leb(ubi, vol, lnum); | |
855 | if (err) | |
856 | return err; | |
857 | return ubi_eba_write_leb(ubi, vol, lnum, NULL, 0, 0, dtype); | |
858 | } | |
859 | ||
33818bbb | 860 | vid_hdr = ubi_zalloc_vid_hdr(ubi, GFP_NOFS); |
801c135c AB |
861 | if (!vid_hdr) |
862 | return -ENOMEM; | |
863 | ||
e8823bd6 | 864 | mutex_lock(&ubi->alc_mutex); |
801c135c | 865 | err = leb_write_lock(ubi, vol_id, lnum); |
e8823bd6 AB |
866 | if (err) |
867 | goto out_mutex; | |
801c135c | 868 | |
3261ebd7 CH |
869 | vid_hdr->sqnum = cpu_to_be64(next_sqnum(ubi)); |
870 | vid_hdr->vol_id = cpu_to_be32(vol_id); | |
871 | vid_hdr->lnum = cpu_to_be32(lnum); | |
801c135c | 872 | vid_hdr->compat = ubi_get_compat(ubi, vol_id); |
3261ebd7 | 873 | vid_hdr->data_pad = cpu_to_be32(vol->data_pad); |
801c135c AB |
874 | |
875 | crc = crc32(UBI_CRC32_INIT, buf, len); | |
84a92580 | 876 | vid_hdr->vol_type = UBI_VID_DYNAMIC; |
3261ebd7 | 877 | vid_hdr->data_size = cpu_to_be32(len); |
801c135c | 878 | vid_hdr->copy_flag = 1; |
3261ebd7 | 879 | vid_hdr->data_crc = cpu_to_be32(crc); |
801c135c AB |
880 | |
881 | retry: | |
882 | pnum = ubi_wl_get_peb(ubi, dtype); | |
883 | if (pnum < 0) { | |
e8823bd6 AB |
884 | err = pnum; |
885 | goto out_leb_unlock; | |
801c135c AB |
886 | } |
887 | ||
888 | dbg_eba("change LEB %d:%d, PEB %d, write VID hdr to PEB %d", | |
889 | vol_id, lnum, vol->eba_tbl[lnum], pnum); | |
890 | ||
891 | err = ubi_io_write_vid_hdr(ubi, pnum, vid_hdr); | |
892 | if (err) { | |
893 | ubi_warn("failed to write VID header to LEB %d:%d, PEB %d", | |
894 | vol_id, lnum, pnum); | |
895 | goto write_error; | |
896 | } | |
897 | ||
898 | err = ubi_io_write_data(ubi, buf, pnum, 0, len); | |
899 | if (err) { | |
900 | ubi_warn("failed to write %d bytes of data to PEB %d", | |
901 | len, pnum); | |
902 | goto write_error; | |
903 | } | |
904 | ||
a443db48 | 905 | if (vol->eba_tbl[lnum] >= 0) { |
4d88de4b | 906 | err = ubi_wl_put_peb(ubi, vol->eba_tbl[lnum], 0); |
e8823bd6 AB |
907 | if (err) |
908 | goto out_leb_unlock; | |
801c135c AB |
909 | } |
910 | ||
911 | vol->eba_tbl[lnum] = pnum; | |
e8823bd6 AB |
912 | |
913 | out_leb_unlock: | |
801c135c | 914 | leb_write_unlock(ubi, vol_id, lnum); |
e8823bd6 AB |
915 | out_mutex: |
916 | mutex_unlock(&ubi->alc_mutex); | |
801c135c | 917 | ubi_free_vid_hdr(ubi, vid_hdr); |
e8823bd6 | 918 | return err; |
801c135c AB |
919 | |
920 | write_error: | |
921 | if (err != -EIO || !ubi->bad_allowed) { | |
922 | /* | |
923 | * This flash device does not admit of bad eraseblocks or | |
924 | * something nasty and unexpected happened. Switch to read-only | |
925 | * mode just in case. | |
926 | */ | |
927 | ubi_ro_mode(ubi); | |
e8823bd6 | 928 | goto out_leb_unlock; |
801c135c AB |
929 | } |
930 | ||
931 | err = ubi_wl_put_peb(ubi, pnum, 1); | |
932 | if (err || ++tries > UBI_IO_RETRIES) { | |
933 | ubi_ro_mode(ubi); | |
e8823bd6 | 934 | goto out_leb_unlock; |
801c135c AB |
935 | } |
936 | ||
3261ebd7 | 937 | vid_hdr->sqnum = cpu_to_be64(next_sqnum(ubi)); |
801c135c AB |
938 | ubi_msg("try another PEB"); |
939 | goto retry; | |
940 | } | |
941 | ||
801c135c AB |
942 | /** |
943 | * ubi_eba_copy_leb - copy logical eraseblock. | |
944 | * @ubi: UBI device description object | |
945 | * @from: physical eraseblock number from where to copy | |
946 | * @to: physical eraseblock number where to copy | |
947 | * @vid_hdr: VID header of the @from physical eraseblock | |
948 | * | |
949 | * This function copies logical eraseblock from physical eraseblock @from to | |
950 | * physical eraseblock @to. The @vid_hdr buffer may be changed by this | |
43f9b25a AB |
951 | * function. Returns: |
952 | * o %0 in case of success; | |
953 | * o %1 if the operation was canceled and should be tried later (e.g., | |
954 | * because a bit-flip was detected at the target PEB); | |
955 | * o %2 if the volume is being deleted and this LEB should not be moved. | |
801c135c AB |
956 | */ |
957 | int ubi_eba_copy_leb(struct ubi_device *ubi, int from, int to, | |
958 | struct ubi_vid_hdr *vid_hdr) | |
959 | { | |
43f9b25a | 960 | int err, vol_id, lnum, data_size, aldata_size, idx; |
801c135c AB |
961 | struct ubi_volume *vol; |
962 | uint32_t crc; | |
801c135c | 963 | |
3261ebd7 CH |
964 | vol_id = be32_to_cpu(vid_hdr->vol_id); |
965 | lnum = be32_to_cpu(vid_hdr->lnum); | |
801c135c AB |
966 | |
967 | dbg_eba("copy LEB %d:%d, PEB %d to PEB %d", vol_id, lnum, from, to); | |
968 | ||
969 | if (vid_hdr->vol_type == UBI_VID_STATIC) { | |
3261ebd7 | 970 | data_size = be32_to_cpu(vid_hdr->data_size); |
801c135c AB |
971 | aldata_size = ALIGN(data_size, ubi->min_io_size); |
972 | } else | |
973 | data_size = aldata_size = | |
3261ebd7 | 974 | ubi->leb_size - be32_to_cpu(vid_hdr->data_pad); |
801c135c | 975 | |
801c135c | 976 | idx = vol_id2idx(ubi, vol_id); |
43f9b25a | 977 | spin_lock(&ubi->volumes_lock); |
801c135c | 978 | /* |
43f9b25a AB |
979 | * Note, we may race with volume deletion, which means that the volume |
980 | * this logical eraseblock belongs to might be being deleted. Since the | |
981 | * volume deletion unmaps all the volume's logical eraseblocks, it will | |
982 | * be locked in 'ubi_wl_put_peb()' and wait for the WL worker to finish. | |
801c135c | 983 | */ |
801c135c AB |
984 | vol = ubi->volumes[idx]; |
985 | if (!vol) { | |
43f9b25a AB |
986 | /* No need to do further work, cancel */ |
987 | dbg_eba("volume %d is being removed, cancel", vol_id); | |
801c135c | 988 | spin_unlock(&ubi->volumes_lock); |
43f9b25a | 989 | return 2; |
801c135c | 990 | } |
43f9b25a | 991 | spin_unlock(&ubi->volumes_lock); |
801c135c | 992 | |
43f9b25a AB |
993 | /* |
994 | * We do not want anybody to write to this logical eraseblock while we | |
995 | * are moving it, so lock it. | |
996 | * | |
997 | * Note, we are using non-waiting locking here, because we cannot sleep | |
998 | * on the LEB, since it may cause deadlocks. Indeed, imagine a task is | |
999 | * unmapping the LEB which is mapped to the PEB we are going to move | |
1000 | * (@from). This task locks the LEB and goes sleep in the | |
1001 | * 'ubi_wl_put_peb()' function on the @ubi->move_mutex. In turn, we are | |
1002 | * holding @ubi->move_mutex and go sleep on the LEB lock. So, if the | |
1003 | * LEB is already locked, we just do not move it and return %1. | |
1004 | */ | |
1005 | err = leb_write_trylock(ubi, vol_id, lnum); | |
1006 | if (err) { | |
1007 | dbg_eba("contention on LEB %d:%d, cancel", vol_id, lnum); | |
1008 | return err; | |
801c135c | 1009 | } |
801c135c | 1010 | |
43f9b25a AB |
1011 | /* |
1012 | * The LEB might have been put meanwhile, and the task which put it is | |
1013 | * probably waiting on @ubi->move_mutex. No need to continue the work, | |
1014 | * cancel it. | |
1015 | */ | |
1016 | if (vol->eba_tbl[lnum] != from) { | |
1017 | dbg_eba("LEB %d:%d is no longer mapped to PEB %d, mapped to " | |
1018 | "PEB %d, cancel", vol_id, lnum, from, | |
1019 | vol->eba_tbl[lnum]); | |
1020 | err = 1; | |
1021 | goto out_unlock_leb; | |
1022 | } | |
801c135c | 1023 | |
43f9b25a | 1024 | /* |
b77bcb07 | 1025 | * OK, now the LEB is locked and we can safely start moving it. Since |
43f9b25a AB |
1026 | * this function utilizes thie @ubi->peb1_buf buffer which is shared |
1027 | * with some other functions, so lock the buffer by taking the | |
1028 | * @ubi->buf_mutex. | |
1029 | */ | |
1030 | mutex_lock(&ubi->buf_mutex); | |
801c135c | 1031 | dbg_eba("read %d bytes of data", aldata_size); |
e88d6e10 | 1032 | err = ubi_io_read_data(ubi, ubi->peb_buf1, from, 0, aldata_size); |
801c135c AB |
1033 | if (err && err != UBI_IO_BITFLIPS) { |
1034 | ubi_warn("error %d while reading data from PEB %d", | |
1035 | err, from); | |
43f9b25a | 1036 | goto out_unlock_buf; |
801c135c AB |
1037 | } |
1038 | ||
1039 | /* | |
1040 | * Now we have got to calculate how much data we have to to copy. In | |
1041 | * case of a static volume it is fairly easy - the VID header contains | |
1042 | * the data size. In case of a dynamic volume it is more difficult - we | |
1043 | * have to read the contents, cut 0xFF bytes from the end and copy only | |
1044 | * the first part. We must do this to avoid writing 0xFF bytes as it | |
1045 | * may have some side-effects. And not only this. It is important not | |
1046 | * to include those 0xFFs to CRC because later the they may be filled | |
1047 | * by data. | |
1048 | */ | |
1049 | if (vid_hdr->vol_type == UBI_VID_DYNAMIC) | |
1050 | aldata_size = data_size = | |
e88d6e10 | 1051 | ubi_calc_data_len(ubi, ubi->peb_buf1, data_size); |
801c135c AB |
1052 | |
1053 | cond_resched(); | |
e88d6e10 | 1054 | crc = crc32(UBI_CRC32_INIT, ubi->peb_buf1, data_size); |
801c135c AB |
1055 | cond_resched(); |
1056 | ||
1057 | /* | |
1058 | * It may turn out to me that the whole @from physical eraseblock | |
1059 | * contains only 0xFF bytes. Then we have to only write the VID header | |
1060 | * and do not write any data. This also means we should not set | |
1061 | * @vid_hdr->copy_flag, @vid_hdr->data_size, and @vid_hdr->data_crc. | |
1062 | */ | |
1063 | if (data_size > 0) { | |
1064 | vid_hdr->copy_flag = 1; | |
3261ebd7 CH |
1065 | vid_hdr->data_size = cpu_to_be32(data_size); |
1066 | vid_hdr->data_crc = cpu_to_be32(crc); | |
801c135c | 1067 | } |
3261ebd7 | 1068 | vid_hdr->sqnum = cpu_to_be64(next_sqnum(ubi)); |
801c135c AB |
1069 | |
1070 | err = ubi_io_write_vid_hdr(ubi, to, vid_hdr); | |
1071 | if (err) | |
43f9b25a | 1072 | goto out_unlock_buf; |
801c135c AB |
1073 | |
1074 | cond_resched(); | |
1075 | ||
1076 | /* Read the VID header back and check if it was written correctly */ | |
1077 | err = ubi_io_read_vid_hdr(ubi, to, vid_hdr, 1); | |
1078 | if (err) { | |
1079 | if (err != UBI_IO_BITFLIPS) | |
1080 | ubi_warn("cannot read VID header back from PEB %d", to); | |
43f9b25a AB |
1081 | else |
1082 | err = 1; | |
1083 | goto out_unlock_buf; | |
801c135c AB |
1084 | } |
1085 | ||
1086 | if (data_size > 0) { | |
e88d6e10 | 1087 | err = ubi_io_write_data(ubi, ubi->peb_buf1, to, 0, aldata_size); |
801c135c | 1088 | if (err) |
43f9b25a | 1089 | goto out_unlock_buf; |
801c135c | 1090 | |
e88d6e10 AB |
1091 | cond_resched(); |
1092 | ||
801c135c AB |
1093 | /* |
1094 | * We've written the data and are going to read it back to make | |
1095 | * sure it was written correctly. | |
1096 | */ | |
801c135c | 1097 | |
e88d6e10 | 1098 | err = ubi_io_read_data(ubi, ubi->peb_buf2, to, 0, aldata_size); |
801c135c AB |
1099 | if (err) { |
1100 | if (err != UBI_IO_BITFLIPS) | |
1101 | ubi_warn("cannot read data back from PEB %d", | |
1102 | to); | |
43f9b25a AB |
1103 | else |
1104 | err = 1; | |
1105 | goto out_unlock_buf; | |
801c135c AB |
1106 | } |
1107 | ||
1108 | cond_resched(); | |
1109 | ||
e88d6e10 | 1110 | if (memcmp(ubi->peb_buf1, ubi->peb_buf2, aldata_size)) { |
801c135c AB |
1111 | ubi_warn("read data back from PEB %d - it is different", |
1112 | to); | |
43f9b25a | 1113 | goto out_unlock_buf; |
801c135c AB |
1114 | } |
1115 | } | |
1116 | ||
1117 | ubi_assert(vol->eba_tbl[lnum] == from); | |
1118 | vol->eba_tbl[lnum] = to; | |
1119 | ||
43f9b25a | 1120 | out_unlock_buf: |
e88d6e10 | 1121 | mutex_unlock(&ubi->buf_mutex); |
43f9b25a | 1122 | out_unlock_leb: |
801c135c | 1123 | leb_write_unlock(ubi, vol_id, lnum); |
801c135c AB |
1124 | return err; |
1125 | } | |
1126 | ||
1127 | /** | |
85c6e6e2 | 1128 | * ubi_eba_init_scan - initialize the EBA sub-system using scanning information. |
801c135c AB |
1129 | * @ubi: UBI device description object |
1130 | * @si: scanning information | |
1131 | * | |
1132 | * This function returns zero in case of success and a negative error code in | |
1133 | * case of failure. | |
1134 | */ | |
1135 | int ubi_eba_init_scan(struct ubi_device *ubi, struct ubi_scan_info *si) | |
1136 | { | |
1137 | int i, j, err, num_volumes; | |
1138 | struct ubi_scan_volume *sv; | |
1139 | struct ubi_volume *vol; | |
1140 | struct ubi_scan_leb *seb; | |
1141 | struct rb_node *rb; | |
1142 | ||
85c6e6e2 | 1143 | dbg_eba("initialize EBA sub-system"); |
801c135c AB |
1144 | |
1145 | spin_lock_init(&ubi->ltree_lock); | |
e8823bd6 | 1146 | mutex_init(&ubi->alc_mutex); |
801c135c AB |
1147 | ubi->ltree = RB_ROOT; |
1148 | ||
801c135c AB |
1149 | ubi->global_sqnum = si->max_sqnum + 1; |
1150 | num_volumes = ubi->vtbl_slots + UBI_INT_VOL_COUNT; | |
1151 | ||
1152 | for (i = 0; i < num_volumes; i++) { | |
1153 | vol = ubi->volumes[i]; | |
1154 | if (!vol) | |
1155 | continue; | |
1156 | ||
1157 | cond_resched(); | |
1158 | ||
1159 | vol->eba_tbl = kmalloc(vol->reserved_pebs * sizeof(int), | |
1160 | GFP_KERNEL); | |
1161 | if (!vol->eba_tbl) { | |
1162 | err = -ENOMEM; | |
1163 | goto out_free; | |
1164 | } | |
1165 | ||
1166 | for (j = 0; j < vol->reserved_pebs; j++) | |
1167 | vol->eba_tbl[j] = UBI_LEB_UNMAPPED; | |
1168 | ||
1169 | sv = ubi_scan_find_sv(si, idx2vol_id(ubi, i)); | |
1170 | if (!sv) | |
1171 | continue; | |
1172 | ||
1173 | ubi_rb_for_each_entry(rb, seb, &sv->root, u.rb) { | |
1174 | if (seb->lnum >= vol->reserved_pebs) | |
1175 | /* | |
1176 | * This may happen in case of an unclean reboot | |
1177 | * during re-size. | |
1178 | */ | |
1179 | ubi_scan_move_to_list(sv, seb, &si->erase); | |
1180 | vol->eba_tbl[seb->lnum] = seb->pnum; | |
1181 | } | |
1182 | } | |
1183 | ||
94780d4d AB |
1184 | if (ubi->avail_pebs < EBA_RESERVED_PEBS) { |
1185 | ubi_err("no enough physical eraseblocks (%d, need %d)", | |
1186 | ubi->avail_pebs, EBA_RESERVED_PEBS); | |
1187 | err = -ENOSPC; | |
1188 | goto out_free; | |
1189 | } | |
1190 | ubi->avail_pebs -= EBA_RESERVED_PEBS; | |
1191 | ubi->rsvd_pebs += EBA_RESERVED_PEBS; | |
1192 | ||
801c135c AB |
1193 | if (ubi->bad_allowed) { |
1194 | ubi_calculate_reserved(ubi); | |
1195 | ||
1196 | if (ubi->avail_pebs < ubi->beb_rsvd_level) { | |
1197 | /* No enough free physical eraseblocks */ | |
1198 | ubi->beb_rsvd_pebs = ubi->avail_pebs; | |
1199 | ubi_warn("cannot reserve enough PEBs for bad PEB " | |
1200 | "handling, reserved %d, need %d", | |
1201 | ubi->beb_rsvd_pebs, ubi->beb_rsvd_level); | |
1202 | } else | |
1203 | ubi->beb_rsvd_pebs = ubi->beb_rsvd_level; | |
1204 | ||
1205 | ubi->avail_pebs -= ubi->beb_rsvd_pebs; | |
1206 | ubi->rsvd_pebs += ubi->beb_rsvd_pebs; | |
1207 | } | |
1208 | ||
85c6e6e2 | 1209 | dbg_eba("EBA sub-system is initialized"); |
801c135c AB |
1210 | return 0; |
1211 | ||
1212 | out_free: | |
1213 | for (i = 0; i < num_volumes; i++) { | |
1214 | if (!ubi->volumes[i]) | |
1215 | continue; | |
1216 | kfree(ubi->volumes[i]->eba_tbl); | |
1217 | } | |
801c135c AB |
1218 | return err; |
1219 | } |