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 | /* | |
22 | * The UBI Eraseblock Association (EBA) unit. | |
23 | * | |
24 | * This unit is responsible for I/O to/from logical eraseblock. | |
25 | * | |
26 | * Although in this implementation the EBA table is fully kept and managed in | |
27 | * RAM, which assumes poor scalability, it might be (partially) maintained on | |
28 | * flash in future implementations. | |
29 | * | |
30 | * The EBA unit implements per-logical eraseblock locking. Before accessing a | |
31 | * logical eraseblock it is locked for reading or writing. The per-logical | |
32 | * eraseblock locking is implemented by means of the lock tree. The lock tree | |
33 | * is an RB-tree which refers all the currently locked logical eraseblocks. The | |
34 | * lock tree elements are &struct ltree_entry objects. They are indexed by | |
35 | * (@vol_id, @lnum) pairs. | |
36 | * | |
37 | * EBA also maintains the global sequence counter which is incremented each | |
38 | * time a logical eraseblock is mapped to a physical eraseblock and it is | |
39 | * stored in the volume identifier header. This means that each VID header has | |
40 | * a unique sequence number. The sequence number is only increased an we assume | |
41 | * 64 bits is enough to never overflow. | |
42 | */ | |
43 | ||
44 | #include <linux/slab.h> | |
45 | #include <linux/crc32.h> | |
46 | #include <linux/err.h> | |
47 | #include "ubi.h" | |
48 | ||
49 | /** | |
50 | * struct ltree_entry - an entry in the lock tree. | |
51 | * @rb: links RB-tree nodes | |
52 | * @vol_id: volume ID of the locked logical eraseblock | |
53 | * @lnum: locked logical eraseblock number | |
54 | * @users: how many tasks are using this logical eraseblock or wait for it | |
55 | * @mutex: read/write mutex to implement read/write access serialization to | |
56 | * the (@vol_id, @lnum) logical eraseblock | |
57 | * | |
58 | * When a logical eraseblock is being locked - corresponding &struct ltree_entry | |
59 | * object is inserted to the lock tree (@ubi->ltree). | |
60 | */ | |
61 | struct ltree_entry { | |
62 | struct rb_node rb; | |
63 | int vol_id; | |
64 | int lnum; | |
65 | int users; | |
66 | struct rw_semaphore mutex; | |
67 | }; | |
68 | ||
69 | /* Slab cache for lock-tree entries */ | |
70 | static struct kmem_cache *ltree_slab; | |
71 | ||
72 | /** | |
73 | * next_sqnum - get next sequence number. | |
74 | * @ubi: UBI device description object | |
75 | * | |
76 | * This function returns next sequence number to use, which is just the current | |
77 | * global sequence counter value. It also increases the global sequence | |
78 | * counter. | |
79 | */ | |
80 | static unsigned long long next_sqnum(struct ubi_device *ubi) | |
81 | { | |
82 | unsigned long long sqnum; | |
83 | ||
84 | spin_lock(&ubi->ltree_lock); | |
85 | sqnum = ubi->global_sqnum++; | |
86 | spin_unlock(&ubi->ltree_lock); | |
87 | ||
88 | return sqnum; | |
89 | } | |
90 | ||
91 | /** | |
92 | * ubi_get_compat - get compatibility flags of a volume. | |
93 | * @ubi: UBI device description object | |
94 | * @vol_id: volume ID | |
95 | * | |
96 | * This function returns compatibility flags for an internal volume. User | |
97 | * volumes have no compatibility flags, so %0 is returned. | |
98 | */ | |
99 | static int ubi_get_compat(const struct ubi_device *ubi, int vol_id) | |
100 | { | |
101 | if (vol_id == UBI_LAYOUT_VOL_ID) | |
102 | return UBI_LAYOUT_VOLUME_COMPAT; | |
103 | return 0; | |
104 | } | |
105 | ||
106 | /** | |
107 | * ltree_lookup - look up the lock tree. | |
108 | * @ubi: UBI device description object | |
109 | * @vol_id: volume ID | |
110 | * @lnum: logical eraseblock number | |
111 | * | |
112 | * This function returns a pointer to the corresponding &struct ltree_entry | |
113 | * object if the logical eraseblock is locked and %NULL if it is not. | |
114 | * @ubi->ltree_lock has to be locked. | |
115 | */ | |
116 | static struct ltree_entry *ltree_lookup(struct ubi_device *ubi, int vol_id, | |
117 | int lnum) | |
118 | { | |
119 | struct rb_node *p; | |
120 | ||
121 | p = ubi->ltree.rb_node; | |
122 | while (p) { | |
123 | struct ltree_entry *le; | |
124 | ||
125 | le = rb_entry(p, struct ltree_entry, rb); | |
126 | ||
127 | if (vol_id < le->vol_id) | |
128 | p = p->rb_left; | |
129 | else if (vol_id > le->vol_id) | |
130 | p = p->rb_right; | |
131 | else { | |
132 | if (lnum < le->lnum) | |
133 | p = p->rb_left; | |
134 | else if (lnum > le->lnum) | |
135 | p = p->rb_right; | |
136 | else | |
137 | return le; | |
138 | } | |
139 | } | |
140 | ||
141 | return NULL; | |
142 | } | |
143 | ||
144 | /** | |
145 | * ltree_add_entry - add new entry to the lock tree. | |
146 | * @ubi: UBI device description object | |
147 | * @vol_id: volume ID | |
148 | * @lnum: logical eraseblock number | |
149 | * | |
150 | * This function adds new entry for logical eraseblock (@vol_id, @lnum) to the | |
151 | * lock tree. If such entry is already there, its usage counter is increased. | |
152 | * Returns pointer to the lock tree entry or %-ENOMEM if memory allocation | |
153 | * failed. | |
154 | */ | |
155 | static struct ltree_entry *ltree_add_entry(struct ubi_device *ubi, int vol_id, | |
156 | int lnum) | |
157 | { | |
158 | struct ltree_entry *le, *le1, *le_free; | |
159 | ||
33818bbb | 160 | le = kmem_cache_alloc(ltree_slab, GFP_NOFS); |
801c135c AB |
161 | if (!le) |
162 | return ERR_PTR(-ENOMEM); | |
163 | ||
164 | le->vol_id = vol_id; | |
165 | le->lnum = lnum; | |
166 | ||
167 | spin_lock(&ubi->ltree_lock); | |
168 | le1 = ltree_lookup(ubi, vol_id, lnum); | |
169 | ||
170 | if (le1) { | |
171 | /* | |
172 | * This logical eraseblock is already locked. The newly | |
173 | * allocated lock entry is not needed. | |
174 | */ | |
175 | le_free = le; | |
176 | le = le1; | |
177 | } else { | |
178 | struct rb_node **p, *parent = NULL; | |
179 | ||
180 | /* | |
181 | * No lock entry, add the newly allocated one to the | |
182 | * @ubi->ltree RB-tree. | |
183 | */ | |
184 | le_free = NULL; | |
185 | ||
186 | p = &ubi->ltree.rb_node; | |
187 | while (*p) { | |
188 | parent = *p; | |
189 | le1 = rb_entry(parent, struct ltree_entry, rb); | |
190 | ||
191 | if (vol_id < le1->vol_id) | |
192 | p = &(*p)->rb_left; | |
193 | else if (vol_id > le1->vol_id) | |
194 | p = &(*p)->rb_right; | |
195 | else { | |
196 | ubi_assert(lnum != le1->lnum); | |
197 | if (lnum < le1->lnum) | |
198 | p = &(*p)->rb_left; | |
199 | else | |
200 | p = &(*p)->rb_right; | |
201 | } | |
202 | } | |
203 | ||
204 | rb_link_node(&le->rb, parent, p); | |
205 | rb_insert_color(&le->rb, &ubi->ltree); | |
206 | } | |
207 | le->users += 1; | |
208 | spin_unlock(&ubi->ltree_lock); | |
209 | ||
210 | if (le_free) | |
211 | kmem_cache_free(ltree_slab, le_free); | |
212 | ||
213 | return le; | |
214 | } | |
215 | ||
216 | /** | |
217 | * leb_read_lock - lock logical eraseblock for reading. | |
218 | * @ubi: UBI device description object | |
219 | * @vol_id: volume ID | |
220 | * @lnum: logical eraseblock number | |
221 | * | |
222 | * This function locks a logical eraseblock for reading. Returns zero in case | |
223 | * of success and a negative error code in case of failure. | |
224 | */ | |
225 | static int leb_read_lock(struct ubi_device *ubi, int vol_id, int lnum) | |
226 | { | |
227 | struct ltree_entry *le; | |
228 | ||
229 | le = ltree_add_entry(ubi, vol_id, lnum); | |
230 | if (IS_ERR(le)) | |
231 | return PTR_ERR(le); | |
232 | down_read(&le->mutex); | |
233 | return 0; | |
234 | } | |
235 | ||
236 | /** | |
237 | * leb_read_unlock - unlock logical eraseblock. | |
238 | * @ubi: UBI device description object | |
239 | * @vol_id: volume ID | |
240 | * @lnum: logical eraseblock number | |
241 | */ | |
242 | static void leb_read_unlock(struct ubi_device *ubi, int vol_id, int lnum) | |
243 | { | |
244 | int free = 0; | |
245 | struct ltree_entry *le; | |
246 | ||
247 | spin_lock(&ubi->ltree_lock); | |
248 | le = ltree_lookup(ubi, vol_id, lnum); | |
249 | le->users -= 1; | |
250 | ubi_assert(le->users >= 0); | |
251 | if (le->users == 0) { | |
252 | rb_erase(&le->rb, &ubi->ltree); | |
253 | free = 1; | |
254 | } | |
255 | spin_unlock(&ubi->ltree_lock); | |
256 | ||
257 | up_read(&le->mutex); | |
258 | if (free) | |
259 | kmem_cache_free(ltree_slab, le); | |
260 | } | |
261 | ||
262 | /** | |
263 | * leb_write_lock - lock logical eraseblock for writing. | |
264 | * @ubi: UBI device description object | |
265 | * @vol_id: volume ID | |
266 | * @lnum: logical eraseblock number | |
267 | * | |
268 | * This function locks a logical eraseblock for writing. Returns zero in case | |
269 | * of success and a negative error code in case of failure. | |
270 | */ | |
271 | static int leb_write_lock(struct ubi_device *ubi, int vol_id, int lnum) | |
272 | { | |
273 | struct ltree_entry *le; | |
274 | ||
275 | le = ltree_add_entry(ubi, vol_id, lnum); | |
276 | if (IS_ERR(le)) | |
277 | return PTR_ERR(le); | |
278 | down_write(&le->mutex); | |
279 | return 0; | |
280 | } | |
281 | ||
282 | /** | |
283 | * leb_write_unlock - unlock logical eraseblock. | |
284 | * @ubi: UBI device description object | |
285 | * @vol_id: volume ID | |
286 | * @lnum: logical eraseblock number | |
287 | */ | |
288 | static void leb_write_unlock(struct ubi_device *ubi, int vol_id, int lnum) | |
289 | { | |
290 | int free; | |
291 | struct ltree_entry *le; | |
292 | ||
293 | spin_lock(&ubi->ltree_lock); | |
294 | le = ltree_lookup(ubi, vol_id, lnum); | |
295 | le->users -= 1; | |
296 | ubi_assert(le->users >= 0); | |
297 | if (le->users == 0) { | |
298 | rb_erase(&le->rb, &ubi->ltree); | |
299 | free = 1; | |
300 | } else | |
301 | free = 0; | |
302 | spin_unlock(&ubi->ltree_lock); | |
303 | ||
304 | up_write(&le->mutex); | |
305 | if (free) | |
306 | kmem_cache_free(ltree_slab, le); | |
307 | } | |
308 | ||
309 | /** | |
310 | * ubi_eba_unmap_leb - un-map logical eraseblock. | |
311 | * @ubi: UBI device description object | |
312 | * @vol_id: volume ID | |
313 | * @lnum: logical eraseblock number | |
314 | * | |
315 | * This function un-maps logical eraseblock @lnum and schedules corresponding | |
316 | * physical eraseblock for erasure. Returns zero in case of success and a | |
317 | * negative error code in case of failure. | |
318 | */ | |
319 | int ubi_eba_unmap_leb(struct ubi_device *ubi, int vol_id, int lnum) | |
320 | { | |
321 | int idx = vol_id2idx(ubi, vol_id), err, pnum; | |
322 | struct ubi_volume *vol = ubi->volumes[idx]; | |
323 | ||
324 | if (ubi->ro_mode) | |
325 | return -EROFS; | |
326 | ||
327 | err = leb_write_lock(ubi, vol_id, lnum); | |
328 | if (err) | |
329 | return err; | |
330 | ||
331 | pnum = vol->eba_tbl[lnum]; | |
332 | if (pnum < 0) | |
333 | /* This logical eraseblock is already unmapped */ | |
334 | goto out_unlock; | |
335 | ||
336 | dbg_eba("erase LEB %d:%d, PEB %d", vol_id, lnum, pnum); | |
337 | ||
338 | vol->eba_tbl[lnum] = UBI_LEB_UNMAPPED; | |
339 | err = ubi_wl_put_peb(ubi, pnum, 0); | |
340 | ||
341 | out_unlock: | |
342 | leb_write_unlock(ubi, vol_id, lnum); | |
343 | return err; | |
344 | } | |
345 | ||
346 | /** | |
347 | * ubi_eba_read_leb - read data. | |
348 | * @ubi: UBI device description object | |
349 | * @vol_id: volume ID | |
350 | * @lnum: logical eraseblock number | |
351 | * @buf: buffer to store the read data | |
352 | * @offset: offset from where to read | |
353 | * @len: how many bytes to read | |
354 | * @check: data CRC check flag | |
355 | * | |
356 | * If the logical eraseblock @lnum is unmapped, @buf is filled with 0xFF | |
357 | * bytes. The @check flag only makes sense for static volumes and forces | |
358 | * eraseblock data CRC checking. | |
359 | * | |
360 | * In case of success this function returns zero. In case of a static volume, | |
361 | * if data CRC mismatches - %-EBADMSG is returned. %-EBADMSG may also be | |
362 | * returned for any volume type if an ECC error was detected by the MTD device | |
363 | * driver. Other negative error cored may be returned in case of other errors. | |
364 | */ | |
365 | int ubi_eba_read_leb(struct ubi_device *ubi, int vol_id, int lnum, void *buf, | |
366 | int offset, int len, int check) | |
367 | { | |
368 | int err, pnum, scrub = 0, idx = vol_id2idx(ubi, vol_id); | |
369 | struct ubi_vid_hdr *vid_hdr; | |
370 | struct ubi_volume *vol = ubi->volumes[idx]; | |
a6343afb | 371 | uint32_t uninitialized_var(crc); |
801c135c AB |
372 | |
373 | err = leb_read_lock(ubi, vol_id, lnum); | |
374 | if (err) | |
375 | return err; | |
376 | ||
377 | pnum = vol->eba_tbl[lnum]; | |
378 | if (pnum < 0) { | |
379 | /* | |
380 | * The logical eraseblock is not mapped, fill the whole buffer | |
381 | * with 0xFF bytes. The exception is static volumes for which | |
382 | * it is an error to read unmapped logical eraseblocks. | |
383 | */ | |
384 | dbg_eba("read %d bytes from offset %d of LEB %d:%d (unmapped)", | |
385 | len, offset, vol_id, lnum); | |
386 | leb_read_unlock(ubi, vol_id, lnum); | |
387 | ubi_assert(vol->vol_type != UBI_STATIC_VOLUME); | |
388 | memset(buf, 0xFF, len); | |
389 | return 0; | |
390 | } | |
391 | ||
392 | dbg_eba("read %d bytes from offset %d of LEB %d:%d, PEB %d", | |
393 | len, offset, vol_id, lnum, pnum); | |
394 | ||
395 | if (vol->vol_type == UBI_DYNAMIC_VOLUME) | |
396 | check = 0; | |
397 | ||
398 | retry: | |
399 | if (check) { | |
33818bbb | 400 | vid_hdr = ubi_zalloc_vid_hdr(ubi, GFP_NOFS); |
801c135c AB |
401 | if (!vid_hdr) { |
402 | err = -ENOMEM; | |
403 | goto out_unlock; | |
404 | } | |
405 | ||
406 | err = ubi_io_read_vid_hdr(ubi, pnum, vid_hdr, 1); | |
407 | if (err && err != UBI_IO_BITFLIPS) { | |
408 | if (err > 0) { | |
409 | /* | |
410 | * The header is either absent or corrupted. | |
411 | * The former case means there is a bug - | |
412 | * switch to read-only mode just in case. | |
413 | * The latter case means a real corruption - we | |
414 | * may try to recover data. FIXME: but this is | |
415 | * not implemented. | |
416 | */ | |
417 | if (err == UBI_IO_BAD_VID_HDR) { | |
418 | ubi_warn("bad VID header at PEB %d, LEB" | |
419 | "%d:%d", pnum, vol_id, lnum); | |
420 | err = -EBADMSG; | |
421 | } else | |
422 | ubi_ro_mode(ubi); | |
423 | } | |
424 | goto out_free; | |
425 | } else if (err == UBI_IO_BITFLIPS) | |
426 | scrub = 1; | |
427 | ||
3261ebd7 CH |
428 | ubi_assert(lnum < be32_to_cpu(vid_hdr->used_ebs)); |
429 | ubi_assert(len == be32_to_cpu(vid_hdr->data_size)); | |
801c135c | 430 | |
3261ebd7 | 431 | crc = be32_to_cpu(vid_hdr->data_crc); |
801c135c AB |
432 | ubi_free_vid_hdr(ubi, vid_hdr); |
433 | } | |
434 | ||
435 | err = ubi_io_read_data(ubi, buf, pnum, offset, len); | |
436 | if (err) { | |
437 | if (err == UBI_IO_BITFLIPS) { | |
438 | scrub = 1; | |
439 | err = 0; | |
440 | } else if (err == -EBADMSG) { | |
441 | if (vol->vol_type == UBI_DYNAMIC_VOLUME) | |
442 | goto out_unlock; | |
443 | scrub = 1; | |
444 | if (!check) { | |
445 | ubi_msg("force data checking"); | |
446 | check = 1; | |
447 | goto retry; | |
448 | } | |
449 | } else | |
450 | goto out_unlock; | |
451 | } | |
452 | ||
453 | if (check) { | |
2ab934b8 | 454 | uint32_t crc1 = crc32(UBI_CRC32_INIT, buf, len); |
801c135c AB |
455 | if (crc1 != crc) { |
456 | ubi_warn("CRC error: calculated %#08x, must be %#08x", | |
457 | crc1, crc); | |
458 | err = -EBADMSG; | |
459 | goto out_unlock; | |
460 | } | |
461 | } | |
462 | ||
463 | if (scrub) | |
464 | err = ubi_wl_scrub_peb(ubi, pnum); | |
465 | ||
466 | leb_read_unlock(ubi, vol_id, lnum); | |
467 | return err; | |
468 | ||
469 | out_free: | |
470 | ubi_free_vid_hdr(ubi, vid_hdr); | |
471 | out_unlock: | |
472 | leb_read_unlock(ubi, vol_id, lnum); | |
473 | return err; | |
474 | } | |
475 | ||
476 | /** | |
477 | * recover_peb - recover from write failure. | |
478 | * @ubi: UBI device description object | |
479 | * @pnum: the physical eraseblock to recover | |
480 | * @vol_id: volume ID | |
481 | * @lnum: logical eraseblock number | |
482 | * @buf: data which was not written because of the write failure | |
483 | * @offset: offset of the failed write | |
484 | * @len: how many bytes should have been written | |
485 | * | |
486 | * This function is called in case of a write failure and moves all good data | |
487 | * from the potentially bad physical eraseblock to a good physical eraseblock. | |
488 | * This function also writes the data which was not written due to the failure. | |
489 | * Returns new physical eraseblock number in case of success, and a negative | |
490 | * error code in case of failure. | |
491 | */ | |
492 | static int recover_peb(struct ubi_device *ubi, int pnum, int vol_id, int lnum, | |
493 | const void *buf, int offset, int len) | |
494 | { | |
495 | int err, idx = vol_id2idx(ubi, vol_id), new_pnum, data_size, tries = 0; | |
496 | struct ubi_volume *vol = ubi->volumes[idx]; | |
497 | struct ubi_vid_hdr *vid_hdr; | |
498 | unsigned char *new_buf; | |
499 | ||
33818bbb | 500 | vid_hdr = ubi_zalloc_vid_hdr(ubi, GFP_NOFS); |
801c135c AB |
501 | if (!vid_hdr) { |
502 | return -ENOMEM; | |
503 | } | |
504 | ||
505 | retry: | |
506 | new_pnum = ubi_wl_get_peb(ubi, UBI_UNKNOWN); | |
507 | if (new_pnum < 0) { | |
508 | ubi_free_vid_hdr(ubi, vid_hdr); | |
509 | return new_pnum; | |
510 | } | |
511 | ||
512 | ubi_msg("recover PEB %d, move data to PEB %d", pnum, new_pnum); | |
513 | ||
514 | err = ubi_io_read_vid_hdr(ubi, pnum, vid_hdr, 1); | |
515 | if (err && err != UBI_IO_BITFLIPS) { | |
516 | if (err > 0) | |
517 | err = -EIO; | |
518 | goto out_put; | |
519 | } | |
520 | ||
3261ebd7 | 521 | vid_hdr->sqnum = cpu_to_be64(next_sqnum(ubi)); |
801c135c AB |
522 | err = ubi_io_write_vid_hdr(ubi, new_pnum, vid_hdr); |
523 | if (err) | |
524 | goto write_error; | |
525 | ||
526 | data_size = offset + len; | |
92ad8f37 | 527 | new_buf = vmalloc(data_size); |
801c135c AB |
528 | if (!new_buf) { |
529 | err = -ENOMEM; | |
530 | goto out_put; | |
531 | } | |
532 | memset(new_buf + offset, 0xFF, len); | |
533 | ||
534 | /* Read everything before the area where the write failure happened */ | |
535 | if (offset > 0) { | |
536 | err = ubi_io_read_data(ubi, new_buf, pnum, 0, offset); | |
537 | if (err && err != UBI_IO_BITFLIPS) { | |
92ad8f37 | 538 | vfree(new_buf); |
801c135c AB |
539 | goto out_put; |
540 | } | |
541 | } | |
542 | ||
543 | memcpy(new_buf + offset, buf, len); | |
544 | ||
545 | err = ubi_io_write_data(ubi, new_buf, new_pnum, 0, data_size); | |
546 | if (err) { | |
92ad8f37 | 547 | vfree(new_buf); |
801c135c AB |
548 | goto write_error; |
549 | } | |
550 | ||
92ad8f37 | 551 | vfree(new_buf); |
801c135c AB |
552 | ubi_free_vid_hdr(ubi, vid_hdr); |
553 | ||
554 | vol->eba_tbl[lnum] = new_pnum; | |
555 | ubi_wl_put_peb(ubi, pnum, 1); | |
556 | ||
557 | ubi_msg("data was successfully recovered"); | |
558 | return 0; | |
559 | ||
560 | out_put: | |
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) { | |
573 | ubi_free_vid_hdr(ubi, vid_hdr); | |
574 | return err; | |
575 | } | |
576 | ubi_msg("try again"); | |
577 | goto retry; | |
578 | } | |
579 | ||
580 | /** | |
581 | * ubi_eba_write_leb - write data to dynamic volume. | |
582 | * @ubi: UBI device description object | |
583 | * @vol_id: volume ID | |
584 | * @lnum: logical eraseblock number | |
585 | * @buf: the data to write | |
586 | * @offset: offset within the logical eraseblock where to write | |
587 | * @len: how many bytes to write | |
588 | * @dtype: data type | |
589 | * | |
590 | * This function writes data to logical eraseblock @lnum of a dynamic volume | |
591 | * @vol_id. Returns zero in case of success and a negative error code in case | |
592 | * of failure. In case of error, it is possible that something was still | |
593 | * written to the flash media, but may be some garbage. | |
594 | */ | |
595 | int ubi_eba_write_leb(struct ubi_device *ubi, int vol_id, int lnum, | |
596 | const void *buf, int offset, int len, int dtype) | |
597 | { | |
598 | int idx = vol_id2idx(ubi, vol_id), err, pnum, tries = 0; | |
599 | struct ubi_volume *vol = ubi->volumes[idx]; | |
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) | |
618 | err = recover_peb(ubi, pnum, vol_id, lnum, buf, offset, len); | |
619 | if (err) | |
620 | ubi_ro_mode(ubi); | |
621 | } | |
622 | leb_write_unlock(ubi, vol_id, lnum); | |
623 | return err; | |
624 | } | |
625 | ||
626 | /* | |
627 | * The logical eraseblock is not mapped. We have to get a free physical | |
628 | * eraseblock and write the volume identifier header there first. | |
629 | */ | |
33818bbb | 630 | vid_hdr = ubi_zalloc_vid_hdr(ubi, GFP_NOFS); |
801c135c AB |
631 | if (!vid_hdr) { |
632 | leb_write_unlock(ubi, vol_id, lnum); | |
633 | return -ENOMEM; | |
634 | } | |
635 | ||
636 | vid_hdr->vol_type = UBI_VID_DYNAMIC; | |
3261ebd7 CH |
637 | vid_hdr->sqnum = cpu_to_be64(next_sqnum(ubi)); |
638 | vid_hdr->vol_id = cpu_to_be32(vol_id); | |
639 | vid_hdr->lnum = cpu_to_be32(lnum); | |
801c135c | 640 | vid_hdr->compat = ubi_get_compat(ubi, vol_id); |
3261ebd7 | 641 | vid_hdr->data_pad = cpu_to_be32(vol->data_pad); |
801c135c AB |
642 | |
643 | retry: | |
644 | pnum = ubi_wl_get_peb(ubi, dtype); | |
645 | if (pnum < 0) { | |
646 | ubi_free_vid_hdr(ubi, vid_hdr); | |
647 | leb_write_unlock(ubi, vol_id, lnum); | |
648 | return pnum; | |
649 | } | |
650 | ||
651 | dbg_eba("write VID hdr and %d bytes at offset %d of LEB %d:%d, PEB %d", | |
652 | len, offset, vol_id, lnum, pnum); | |
653 | ||
654 | err = ubi_io_write_vid_hdr(ubi, pnum, vid_hdr); | |
655 | if (err) { | |
656 | ubi_warn("failed to write VID header to LEB %d:%d, PEB %d", | |
657 | vol_id, lnum, pnum); | |
658 | goto write_error; | |
659 | } | |
660 | ||
661 | err = ubi_io_write_data(ubi, buf, pnum, offset, len); | |
662 | if (err) { | |
663 | ubi_warn("failed to write %d bytes at offset %d of LEB %d:%d, " | |
664 | "PEB %d", len, offset, vol_id, lnum, pnum); | |
665 | goto write_error; | |
666 | } | |
667 | ||
668 | vol->eba_tbl[lnum] = pnum; | |
669 | ||
670 | leb_write_unlock(ubi, vol_id, lnum); | |
671 | ubi_free_vid_hdr(ubi, vid_hdr); | |
672 | return 0; | |
673 | ||
674 | write_error: | |
675 | if (err != -EIO || !ubi->bad_allowed) { | |
676 | ubi_ro_mode(ubi); | |
677 | leb_write_unlock(ubi, vol_id, lnum); | |
678 | ubi_free_vid_hdr(ubi, vid_hdr); | |
679 | return err; | |
680 | } | |
681 | ||
682 | /* | |
683 | * Fortunately, this is the first write operation to this physical | |
684 | * eraseblock, so just put it and request a new one. We assume that if | |
685 | * this physical eraseblock went bad, the erase code will handle that. | |
686 | */ | |
687 | err = ubi_wl_put_peb(ubi, pnum, 1); | |
688 | if (err || ++tries > UBI_IO_RETRIES) { | |
689 | ubi_ro_mode(ubi); | |
690 | leb_write_unlock(ubi, vol_id, lnum); | |
691 | ubi_free_vid_hdr(ubi, vid_hdr); | |
692 | return err; | |
693 | } | |
694 | ||
3261ebd7 | 695 | vid_hdr->sqnum = cpu_to_be64(next_sqnum(ubi)); |
801c135c AB |
696 | ubi_msg("try another PEB"); |
697 | goto retry; | |
698 | } | |
699 | ||
700 | /** | |
701 | * ubi_eba_write_leb_st - write data to static volume. | |
702 | * @ubi: UBI device description object | |
703 | * @vol_id: volume ID | |
704 | * @lnum: logical eraseblock number | |
705 | * @buf: data to write | |
706 | * @len: how many bytes to write | |
707 | * @dtype: data type | |
708 | * @used_ebs: how many logical eraseblocks will this volume contain | |
709 | * | |
710 | * This function writes data to logical eraseblock @lnum of static volume | |
711 | * @vol_id. The @used_ebs argument should contain total number of logical | |
712 | * eraseblock in this static volume. | |
713 | * | |
714 | * When writing to the last logical eraseblock, the @len argument doesn't have | |
715 | * to be aligned to the minimal I/O unit size. Instead, it has to be equivalent | |
716 | * to the real data size, although the @buf buffer has to contain the | |
717 | * alignment. In all other cases, @len has to be aligned. | |
718 | * | |
719 | * It is prohibited to write more then once to logical eraseblocks of static | |
720 | * volumes. This function returns zero in case of success and a negative error | |
721 | * code in case of failure. | |
722 | */ | |
723 | int ubi_eba_write_leb_st(struct ubi_device *ubi, int vol_id, int lnum, | |
724 | const void *buf, int len, int dtype, int used_ebs) | |
725 | { | |
726 | int err, pnum, tries = 0, data_size = len; | |
727 | int idx = vol_id2idx(ubi, vol_id); | |
728 | struct ubi_volume *vol = ubi->volumes[idx]; | |
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 | |
739 | ubi_assert(len % ubi->min_io_size == 0); | |
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 | |
824 | * @vol_id: volume ID | |
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. | |
835 | */ | |
836 | int ubi_eba_atomic_leb_change(struct ubi_device *ubi, int vol_id, int lnum, | |
837 | const void *buf, int len, int dtype) | |
838 | { | |
839 | int err, pnum, tries = 0, idx = vol_id2idx(ubi, vol_id); | |
840 | struct ubi_volume *vol = ubi->volumes[idx]; | |
841 | struct ubi_vid_hdr *vid_hdr; | |
842 | uint32_t crc; | |
843 | ||
844 | if (ubi->ro_mode) | |
845 | return -EROFS; | |
846 | ||
33818bbb | 847 | vid_hdr = ubi_zalloc_vid_hdr(ubi, GFP_NOFS); |
801c135c AB |
848 | if (!vid_hdr) |
849 | return -ENOMEM; | |
850 | ||
851 | err = leb_write_lock(ubi, vol_id, lnum); | |
852 | if (err) { | |
853 | ubi_free_vid_hdr(ubi, vid_hdr); | |
854 | return err; | |
855 | } | |
856 | ||
3261ebd7 CH |
857 | vid_hdr->sqnum = cpu_to_be64(next_sqnum(ubi)); |
858 | vid_hdr->vol_id = cpu_to_be32(vol_id); | |
859 | vid_hdr->lnum = cpu_to_be32(lnum); | |
801c135c | 860 | vid_hdr->compat = ubi_get_compat(ubi, vol_id); |
3261ebd7 | 861 | vid_hdr->data_pad = cpu_to_be32(vol->data_pad); |
801c135c AB |
862 | |
863 | crc = crc32(UBI_CRC32_INIT, buf, len); | |
84a92580 | 864 | vid_hdr->vol_type = UBI_VID_DYNAMIC; |
3261ebd7 | 865 | vid_hdr->data_size = cpu_to_be32(len); |
801c135c | 866 | vid_hdr->copy_flag = 1; |
3261ebd7 | 867 | vid_hdr->data_crc = cpu_to_be32(crc); |
801c135c AB |
868 | |
869 | retry: | |
870 | pnum = ubi_wl_get_peb(ubi, dtype); | |
871 | if (pnum < 0) { | |
872 | ubi_free_vid_hdr(ubi, vid_hdr); | |
873 | leb_write_unlock(ubi, vol_id, lnum); | |
874 | return pnum; | |
875 | } | |
876 | ||
877 | dbg_eba("change LEB %d:%d, PEB %d, write VID hdr to PEB %d", | |
878 | vol_id, lnum, vol->eba_tbl[lnum], pnum); | |
879 | ||
880 | err = ubi_io_write_vid_hdr(ubi, pnum, vid_hdr); | |
881 | if (err) { | |
882 | ubi_warn("failed to write VID header to LEB %d:%d, PEB %d", | |
883 | vol_id, lnum, pnum); | |
884 | goto write_error; | |
885 | } | |
886 | ||
887 | err = ubi_io_write_data(ubi, buf, pnum, 0, len); | |
888 | if (err) { | |
889 | ubi_warn("failed to write %d bytes of data to PEB %d", | |
890 | len, pnum); | |
891 | goto write_error; | |
892 | } | |
893 | ||
a443db48 AB |
894 | if (vol->eba_tbl[lnum] >= 0) { |
895 | err = ubi_wl_put_peb(ubi, vol->eba_tbl[lnum], 1); | |
896 | if (err) { | |
897 | ubi_free_vid_hdr(ubi, vid_hdr); | |
898 | leb_write_unlock(ubi, vol_id, lnum); | |
899 | return err; | |
900 | } | |
801c135c AB |
901 | } |
902 | ||
903 | vol->eba_tbl[lnum] = pnum; | |
904 | leb_write_unlock(ubi, vol_id, lnum); | |
905 | ubi_free_vid_hdr(ubi, vid_hdr); | |
906 | return 0; | |
907 | ||
908 | write_error: | |
909 | if (err != -EIO || !ubi->bad_allowed) { | |
910 | /* | |
911 | * This flash device does not admit of bad eraseblocks or | |
912 | * something nasty and unexpected happened. Switch to read-only | |
913 | * mode just in case. | |
914 | */ | |
915 | ubi_ro_mode(ubi); | |
916 | leb_write_unlock(ubi, vol_id, lnum); | |
917 | ubi_free_vid_hdr(ubi, vid_hdr); | |
918 | return err; | |
919 | } | |
920 | ||
921 | err = ubi_wl_put_peb(ubi, pnum, 1); | |
922 | if (err || ++tries > UBI_IO_RETRIES) { | |
923 | ubi_ro_mode(ubi); | |
924 | leb_write_unlock(ubi, vol_id, lnum); | |
925 | ubi_free_vid_hdr(ubi, vid_hdr); | |
926 | return err; | |
927 | } | |
928 | ||
3261ebd7 | 929 | vid_hdr->sqnum = cpu_to_be64(next_sqnum(ubi)); |
801c135c AB |
930 | ubi_msg("try another PEB"); |
931 | goto retry; | |
932 | } | |
933 | ||
934 | /** | |
935 | * ltree_entry_ctor - lock tree entries slab cache constructor. | |
936 | * @obj: the lock-tree entry to construct | |
937 | * @cache: the lock tree entry slab cache | |
938 | * @flags: constructor flags | |
939 | */ | |
940 | static void ltree_entry_ctor(void *obj, struct kmem_cache *cache, | |
941 | unsigned long flags) | |
942 | { | |
943 | struct ltree_entry *le = obj; | |
944 | ||
801c135c AB |
945 | le->users = 0; |
946 | init_rwsem(&le->mutex); | |
947 | } | |
948 | ||
949 | /** | |
950 | * ubi_eba_copy_leb - copy logical eraseblock. | |
951 | * @ubi: UBI device description object | |
952 | * @from: physical eraseblock number from where to copy | |
953 | * @to: physical eraseblock number where to copy | |
954 | * @vid_hdr: VID header of the @from physical eraseblock | |
955 | * | |
956 | * This function copies logical eraseblock from physical eraseblock @from to | |
957 | * physical eraseblock @to. The @vid_hdr buffer may be changed by this | |
958 | * function. Returns zero in case of success, %UBI_IO_BITFLIPS if the operation | |
959 | * was canceled because bit-flips were detected at the target PEB, and a | |
960 | * negative error code in case of failure. | |
961 | */ | |
962 | int ubi_eba_copy_leb(struct ubi_device *ubi, int from, int to, | |
963 | struct ubi_vid_hdr *vid_hdr) | |
964 | { | |
965 | int err, vol_id, lnum, data_size, aldata_size, pnum, idx; | |
966 | struct ubi_volume *vol; | |
967 | uint32_t crc; | |
968 | void *buf, *buf1 = NULL; | |
969 | ||
3261ebd7 CH |
970 | vol_id = be32_to_cpu(vid_hdr->vol_id); |
971 | lnum = be32_to_cpu(vid_hdr->lnum); | |
801c135c AB |
972 | |
973 | dbg_eba("copy LEB %d:%d, PEB %d to PEB %d", vol_id, lnum, from, to); | |
974 | ||
975 | if (vid_hdr->vol_type == UBI_VID_STATIC) { | |
3261ebd7 | 976 | data_size = be32_to_cpu(vid_hdr->data_size); |
801c135c AB |
977 | aldata_size = ALIGN(data_size, ubi->min_io_size); |
978 | } else | |
979 | data_size = aldata_size = | |
3261ebd7 | 980 | ubi->leb_size - be32_to_cpu(vid_hdr->data_pad); |
801c135c | 981 | |
92ad8f37 | 982 | buf = vmalloc(aldata_size); |
801c135c AB |
983 | if (!buf) |
984 | return -ENOMEM; | |
985 | ||
986 | /* | |
987 | * We do not want anybody to write to this logical eraseblock while we | |
988 | * are moving it, so we lock it. | |
989 | */ | |
990 | err = leb_write_lock(ubi, vol_id, lnum); | |
991 | if (err) { | |
92ad8f37 | 992 | vfree(buf); |
801c135c AB |
993 | return err; |
994 | } | |
995 | ||
996 | /* | |
997 | * But the logical eraseblock might have been put by this time. | |
998 | * Cancel if it is true. | |
999 | */ | |
1000 | idx = vol_id2idx(ubi, vol_id); | |
1001 | ||
1002 | /* | |
1003 | * We may race with volume deletion/re-size, so we have to hold | |
1004 | * @ubi->volumes_lock. | |
1005 | */ | |
1006 | spin_lock(&ubi->volumes_lock); | |
1007 | vol = ubi->volumes[idx]; | |
1008 | if (!vol) { | |
1009 | dbg_eba("volume %d was removed meanwhile", vol_id); | |
1010 | spin_unlock(&ubi->volumes_lock); | |
1011 | goto out_unlock; | |
1012 | } | |
1013 | ||
1014 | pnum = vol->eba_tbl[lnum]; | |
1015 | if (pnum != from) { | |
1016 | dbg_eba("LEB %d:%d is no longer mapped to PEB %d, mapped to " | |
1017 | "PEB %d, cancel", vol_id, lnum, from, pnum); | |
1018 | spin_unlock(&ubi->volumes_lock); | |
1019 | goto out_unlock; | |
1020 | } | |
1021 | spin_unlock(&ubi->volumes_lock); | |
1022 | ||
1023 | /* OK, now the LEB is locked and we can safely start moving it */ | |
1024 | ||
1025 | dbg_eba("read %d bytes of data", aldata_size); | |
1026 | err = ubi_io_read_data(ubi, buf, from, 0, aldata_size); | |
1027 | if (err && err != UBI_IO_BITFLIPS) { | |
1028 | ubi_warn("error %d while reading data from PEB %d", | |
1029 | err, from); | |
1030 | goto out_unlock; | |
1031 | } | |
1032 | ||
1033 | /* | |
1034 | * Now we have got to calculate how much data we have to to copy. In | |
1035 | * case of a static volume it is fairly easy - the VID header contains | |
1036 | * the data size. In case of a dynamic volume it is more difficult - we | |
1037 | * have to read the contents, cut 0xFF bytes from the end and copy only | |
1038 | * the first part. We must do this to avoid writing 0xFF bytes as it | |
1039 | * may have some side-effects. And not only this. It is important not | |
1040 | * to include those 0xFFs to CRC because later the they may be filled | |
1041 | * by data. | |
1042 | */ | |
1043 | if (vid_hdr->vol_type == UBI_VID_DYNAMIC) | |
1044 | aldata_size = data_size = | |
1045 | ubi_calc_data_len(ubi, buf, data_size); | |
1046 | ||
1047 | cond_resched(); | |
1048 | crc = crc32(UBI_CRC32_INIT, buf, data_size); | |
1049 | cond_resched(); | |
1050 | ||
1051 | /* | |
1052 | * It may turn out to me that the whole @from physical eraseblock | |
1053 | * contains only 0xFF bytes. Then we have to only write the VID header | |
1054 | * and do not write any data. This also means we should not set | |
1055 | * @vid_hdr->copy_flag, @vid_hdr->data_size, and @vid_hdr->data_crc. | |
1056 | */ | |
1057 | if (data_size > 0) { | |
1058 | vid_hdr->copy_flag = 1; | |
3261ebd7 CH |
1059 | vid_hdr->data_size = cpu_to_be32(data_size); |
1060 | vid_hdr->data_crc = cpu_to_be32(crc); | |
801c135c | 1061 | } |
3261ebd7 | 1062 | vid_hdr->sqnum = cpu_to_be64(next_sqnum(ubi)); |
801c135c AB |
1063 | |
1064 | err = ubi_io_write_vid_hdr(ubi, to, vid_hdr); | |
1065 | if (err) | |
1066 | goto out_unlock; | |
1067 | ||
1068 | cond_resched(); | |
1069 | ||
1070 | /* Read the VID header back and check if it was written correctly */ | |
1071 | err = ubi_io_read_vid_hdr(ubi, to, vid_hdr, 1); | |
1072 | if (err) { | |
1073 | if (err != UBI_IO_BITFLIPS) | |
1074 | ubi_warn("cannot read VID header back from PEB %d", to); | |
1075 | goto out_unlock; | |
1076 | } | |
1077 | ||
1078 | if (data_size > 0) { | |
1079 | err = ubi_io_write_data(ubi, buf, to, 0, aldata_size); | |
1080 | if (err) | |
1081 | goto out_unlock; | |
1082 | ||
1083 | /* | |
1084 | * We've written the data and are going to read it back to make | |
1085 | * sure it was written correctly. | |
1086 | */ | |
92ad8f37 | 1087 | buf1 = vmalloc(aldata_size); |
801c135c AB |
1088 | if (!buf1) { |
1089 | err = -ENOMEM; | |
1090 | goto out_unlock; | |
1091 | } | |
1092 | ||
1093 | cond_resched(); | |
1094 | ||
1095 | err = ubi_io_read_data(ubi, buf1, to, 0, aldata_size); | |
1096 | if (err) { | |
1097 | if (err != UBI_IO_BITFLIPS) | |
1098 | ubi_warn("cannot read data back from PEB %d", | |
1099 | to); | |
1100 | goto out_unlock; | |
1101 | } | |
1102 | ||
1103 | cond_resched(); | |
1104 | ||
1105 | if (memcmp(buf, buf1, aldata_size)) { | |
1106 | ubi_warn("read data back from PEB %d - it is different", | |
1107 | to); | |
1108 | goto out_unlock; | |
1109 | } | |
1110 | } | |
1111 | ||
1112 | ubi_assert(vol->eba_tbl[lnum] == from); | |
1113 | vol->eba_tbl[lnum] = to; | |
1114 | ||
1115 | leb_write_unlock(ubi, vol_id, lnum); | |
92ad8f37 AB |
1116 | vfree(buf); |
1117 | vfree(buf1); | |
801c135c AB |
1118 | |
1119 | return 0; | |
1120 | ||
1121 | out_unlock: | |
1122 | leb_write_unlock(ubi, vol_id, lnum); | |
92ad8f37 AB |
1123 | vfree(buf); |
1124 | vfree(buf1); | |
801c135c AB |
1125 | return err; |
1126 | } | |
1127 | ||
1128 | /** | |
1129 | * ubi_eba_init_scan - initialize the EBA unit using scanning information. | |
1130 | * @ubi: UBI device description object | |
1131 | * @si: scanning information | |
1132 | * | |
1133 | * This function returns zero in case of success and a negative error code in | |
1134 | * case of failure. | |
1135 | */ | |
1136 | int ubi_eba_init_scan(struct ubi_device *ubi, struct ubi_scan_info *si) | |
1137 | { | |
1138 | int i, j, err, num_volumes; | |
1139 | struct ubi_scan_volume *sv; | |
1140 | struct ubi_volume *vol; | |
1141 | struct ubi_scan_leb *seb; | |
1142 | struct rb_node *rb; | |
1143 | ||
1144 | dbg_eba("initialize EBA unit"); | |
1145 | ||
1146 | spin_lock_init(&ubi->ltree_lock); | |
1147 | ubi->ltree = RB_ROOT; | |
1148 | ||
1149 | if (ubi_devices_cnt == 0) { | |
1150 | ltree_slab = kmem_cache_create("ubi_ltree_slab", | |
1151 | sizeof(struct ltree_entry), 0, | |
20c2df83 | 1152 | 0, <ree_entry_ctor); |
801c135c AB |
1153 | if (!ltree_slab) |
1154 | return -ENOMEM; | |
1155 | } | |
1156 | ||
1157 | ubi->global_sqnum = si->max_sqnum + 1; | |
1158 | num_volumes = ubi->vtbl_slots + UBI_INT_VOL_COUNT; | |
1159 | ||
1160 | for (i = 0; i < num_volumes; i++) { | |
1161 | vol = ubi->volumes[i]; | |
1162 | if (!vol) | |
1163 | continue; | |
1164 | ||
1165 | cond_resched(); | |
1166 | ||
1167 | vol->eba_tbl = kmalloc(vol->reserved_pebs * sizeof(int), | |
1168 | GFP_KERNEL); | |
1169 | if (!vol->eba_tbl) { | |
1170 | err = -ENOMEM; | |
1171 | goto out_free; | |
1172 | } | |
1173 | ||
1174 | for (j = 0; j < vol->reserved_pebs; j++) | |
1175 | vol->eba_tbl[j] = UBI_LEB_UNMAPPED; | |
1176 | ||
1177 | sv = ubi_scan_find_sv(si, idx2vol_id(ubi, i)); | |
1178 | if (!sv) | |
1179 | continue; | |
1180 | ||
1181 | ubi_rb_for_each_entry(rb, seb, &sv->root, u.rb) { | |
1182 | if (seb->lnum >= vol->reserved_pebs) | |
1183 | /* | |
1184 | * This may happen in case of an unclean reboot | |
1185 | * during re-size. | |
1186 | */ | |
1187 | ubi_scan_move_to_list(sv, seb, &si->erase); | |
1188 | vol->eba_tbl[seb->lnum] = seb->pnum; | |
1189 | } | |
1190 | } | |
1191 | ||
1192 | if (ubi->bad_allowed) { | |
1193 | ubi_calculate_reserved(ubi); | |
1194 | ||
1195 | if (ubi->avail_pebs < ubi->beb_rsvd_level) { | |
1196 | /* No enough free physical eraseblocks */ | |
1197 | ubi->beb_rsvd_pebs = ubi->avail_pebs; | |
1198 | ubi_warn("cannot reserve enough PEBs for bad PEB " | |
1199 | "handling, reserved %d, need %d", | |
1200 | ubi->beb_rsvd_pebs, ubi->beb_rsvd_level); | |
1201 | } else | |
1202 | ubi->beb_rsvd_pebs = ubi->beb_rsvd_level; | |
1203 | ||
1204 | ubi->avail_pebs -= ubi->beb_rsvd_pebs; | |
1205 | ubi->rsvd_pebs += ubi->beb_rsvd_pebs; | |
1206 | } | |
1207 | ||
1208 | dbg_eba("EBA unit is initialized"); | |
1209 | return 0; | |
1210 | ||
1211 | out_free: | |
1212 | for (i = 0; i < num_volumes; i++) { | |
1213 | if (!ubi->volumes[i]) | |
1214 | continue; | |
1215 | kfree(ubi->volumes[i]->eba_tbl); | |
1216 | } | |
1217 | if (ubi_devices_cnt == 0) | |
1218 | kmem_cache_destroy(ltree_slab); | |
1219 | return err; | |
1220 | } | |
1221 | ||
1222 | /** | |
1223 | * ubi_eba_close - close EBA unit. | |
1224 | * @ubi: UBI device description object | |
1225 | */ | |
1226 | void ubi_eba_close(const struct ubi_device *ubi) | |
1227 | { | |
1228 | int i, num_volumes = ubi->vtbl_slots + UBI_INT_VOL_COUNT; | |
1229 | ||
1230 | dbg_eba("close EBA unit"); | |
1231 | ||
1232 | for (i = 0; i < num_volumes; i++) { | |
1233 | if (!ubi->volumes[i]) | |
1234 | continue; | |
1235 | kfree(ubi->volumes[i]->eba_tbl); | |
1236 | } | |
1237 | if (ubi_devices_cnt == 1) | |
1238 | kmem_cache_destroy(ltree_slab); | |
1239 | } |