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 | |
3a8d4642 | 34 | * lock tree elements are &struct ubi_ltree_entry objects. They are indexed by |
801c135c AB |
35 | * (@vol_id, @lnum) pairs. |
36 | * | |
37 | * EBA also maintains the global sequence counter which is incremented each | |
38 | * time a logical eraseblock is mapped to a physical eraseblock and it is | |
39 | * stored in the volume identifier header. This means that each VID header has | |
40 | * a unique sequence number. The sequence number is only increased an we assume | |
41 | * 64 bits is enough to never overflow. | |
42 | */ | |
43 | ||
44 | #include <linux/slab.h> | |
45 | #include <linux/crc32.h> | |
46 | #include <linux/err.h> | |
47 | #include "ubi.h" | |
48 | ||
e8823bd6 AB |
49 | /* Number of physical eraseblocks reserved for atomic LEB change operation */ |
50 | #define EBA_RESERVED_PEBS 1 | |
51 | ||
801c135c AB |
52 | /** |
53 | * next_sqnum - get next sequence number. | |
54 | * @ubi: UBI device description object | |
55 | * | |
56 | * This function returns next sequence number to use, which is just the current | |
57 | * global sequence counter value. It also increases the global sequence | |
58 | * counter. | |
59 | */ | |
60 | static unsigned long long next_sqnum(struct ubi_device *ubi) | |
61 | { | |
62 | unsigned long long sqnum; | |
63 | ||
64 | spin_lock(&ubi->ltree_lock); | |
65 | sqnum = ubi->global_sqnum++; | |
66 | spin_unlock(&ubi->ltree_lock); | |
67 | ||
68 | return sqnum; | |
69 | } | |
70 | ||
71 | /** | |
72 | * ubi_get_compat - get compatibility flags of a volume. | |
73 | * @ubi: UBI device description object | |
74 | * @vol_id: volume ID | |
75 | * | |
76 | * This function returns compatibility flags for an internal volume. User | |
77 | * volumes have no compatibility flags, so %0 is returned. | |
78 | */ | |
79 | static int ubi_get_compat(const struct ubi_device *ubi, int vol_id) | |
80 | { | |
81 | if (vol_id == UBI_LAYOUT_VOL_ID) | |
82 | return UBI_LAYOUT_VOLUME_COMPAT; | |
83 | return 0; | |
84 | } | |
85 | ||
86 | /** | |
87 | * ltree_lookup - look up the lock tree. | |
88 | * @ubi: UBI device description object | |
89 | * @vol_id: volume ID | |
90 | * @lnum: logical eraseblock number | |
91 | * | |
3a8d4642 | 92 | * This function returns a pointer to the corresponding &struct ubi_ltree_entry |
801c135c AB |
93 | * object if the logical eraseblock is locked and %NULL if it is not. |
94 | * @ubi->ltree_lock has to be locked. | |
95 | */ | |
3a8d4642 AB |
96 | static struct ubi_ltree_entry *ltree_lookup(struct ubi_device *ubi, int vol_id, |
97 | int lnum) | |
801c135c AB |
98 | { |
99 | struct rb_node *p; | |
100 | ||
101 | p = ubi->ltree.rb_node; | |
102 | while (p) { | |
3a8d4642 | 103 | struct ubi_ltree_entry *le; |
801c135c | 104 | |
3a8d4642 | 105 | le = rb_entry(p, struct ubi_ltree_entry, rb); |
801c135c AB |
106 | |
107 | if (vol_id < le->vol_id) | |
108 | p = p->rb_left; | |
109 | else if (vol_id > le->vol_id) | |
110 | p = p->rb_right; | |
111 | else { | |
112 | if (lnum < le->lnum) | |
113 | p = p->rb_left; | |
114 | else if (lnum > le->lnum) | |
115 | p = p->rb_right; | |
116 | else | |
117 | return le; | |
118 | } | |
119 | } | |
120 | ||
121 | return NULL; | |
122 | } | |
123 | ||
124 | /** | |
125 | * ltree_add_entry - add new entry to the lock tree. | |
126 | * @ubi: UBI device description object | |
127 | * @vol_id: volume ID | |
128 | * @lnum: logical eraseblock number | |
129 | * | |
130 | * This function adds new entry for logical eraseblock (@vol_id, @lnum) to the | |
131 | * lock tree. If such entry is already there, its usage counter is increased. | |
132 | * Returns pointer to the lock tree entry or %-ENOMEM if memory allocation | |
133 | * failed. | |
134 | */ | |
3a8d4642 AB |
135 | static struct ubi_ltree_entry *ltree_add_entry(struct ubi_device *ubi, |
136 | int vol_id, int lnum) | |
801c135c | 137 | { |
3a8d4642 | 138 | struct ubi_ltree_entry *le, *le1, *le_free; |
801c135c | 139 | |
3a8d4642 | 140 | le = kmem_cache_alloc(ubi_ltree_slab, GFP_NOFS); |
801c135c AB |
141 | if (!le) |
142 | return ERR_PTR(-ENOMEM); | |
143 | ||
144 | le->vol_id = vol_id; | |
145 | le->lnum = lnum; | |
146 | ||
147 | spin_lock(&ubi->ltree_lock); | |
148 | le1 = ltree_lookup(ubi, vol_id, lnum); | |
149 | ||
150 | if (le1) { | |
151 | /* | |
152 | * This logical eraseblock is already locked. The newly | |
153 | * allocated lock entry is not needed. | |
154 | */ | |
155 | le_free = le; | |
156 | le = le1; | |
157 | } else { | |
158 | struct rb_node **p, *parent = NULL; | |
159 | ||
160 | /* | |
161 | * No lock entry, add the newly allocated one to the | |
162 | * @ubi->ltree RB-tree. | |
163 | */ | |
164 | le_free = NULL; | |
165 | ||
166 | p = &ubi->ltree.rb_node; | |
167 | while (*p) { | |
168 | parent = *p; | |
3a8d4642 | 169 | le1 = rb_entry(parent, struct ubi_ltree_entry, rb); |
801c135c AB |
170 | |
171 | if (vol_id < le1->vol_id) | |
172 | p = &(*p)->rb_left; | |
173 | else if (vol_id > le1->vol_id) | |
174 | p = &(*p)->rb_right; | |
175 | else { | |
176 | ubi_assert(lnum != le1->lnum); | |
177 | if (lnum < le1->lnum) | |
178 | p = &(*p)->rb_left; | |
179 | else | |
180 | p = &(*p)->rb_right; | |
181 | } | |
182 | } | |
183 | ||
184 | rb_link_node(&le->rb, parent, p); | |
185 | rb_insert_color(&le->rb, &ubi->ltree); | |
186 | } | |
187 | le->users += 1; | |
188 | spin_unlock(&ubi->ltree_lock); | |
189 | ||
190 | if (le_free) | |
3a8d4642 | 191 | kmem_cache_free(ubi_ltree_slab, le_free); |
801c135c AB |
192 | |
193 | return le; | |
194 | } | |
195 | ||
196 | /** | |
197 | * leb_read_lock - lock logical eraseblock for reading. | |
198 | * @ubi: UBI device description object | |
199 | * @vol_id: volume ID | |
200 | * @lnum: logical eraseblock number | |
201 | * | |
202 | * This function locks a logical eraseblock for reading. Returns zero in case | |
203 | * of success and a negative error code in case of failure. | |
204 | */ | |
205 | static int leb_read_lock(struct ubi_device *ubi, int vol_id, int lnum) | |
206 | { | |
3a8d4642 | 207 | struct ubi_ltree_entry *le; |
801c135c AB |
208 | |
209 | le = ltree_add_entry(ubi, vol_id, lnum); | |
210 | if (IS_ERR(le)) | |
211 | return PTR_ERR(le); | |
212 | down_read(&le->mutex); | |
213 | return 0; | |
214 | } | |
215 | ||
216 | /** | |
217 | * leb_read_unlock - unlock logical eraseblock. | |
218 | * @ubi: UBI device description object | |
219 | * @vol_id: volume ID | |
220 | * @lnum: logical eraseblock number | |
221 | */ | |
222 | static void leb_read_unlock(struct ubi_device *ubi, int vol_id, int lnum) | |
223 | { | |
224 | int free = 0; | |
3a8d4642 | 225 | struct ubi_ltree_entry *le; |
801c135c AB |
226 | |
227 | spin_lock(&ubi->ltree_lock); | |
228 | le = ltree_lookup(ubi, vol_id, lnum); | |
229 | le->users -= 1; | |
230 | ubi_assert(le->users >= 0); | |
231 | if (le->users == 0) { | |
232 | rb_erase(&le->rb, &ubi->ltree); | |
233 | free = 1; | |
234 | } | |
235 | spin_unlock(&ubi->ltree_lock); | |
236 | ||
237 | up_read(&le->mutex); | |
238 | if (free) | |
3a8d4642 | 239 | kmem_cache_free(ubi_ltree_slab, le); |
801c135c AB |
240 | } |
241 | ||
242 | /** | |
243 | * leb_write_lock - lock logical eraseblock for writing. | |
244 | * @ubi: UBI device description object | |
245 | * @vol_id: volume ID | |
246 | * @lnum: logical eraseblock number | |
247 | * | |
248 | * This function locks a logical eraseblock for writing. Returns zero in case | |
249 | * of success and a negative error code in case of failure. | |
250 | */ | |
251 | static int leb_write_lock(struct ubi_device *ubi, int vol_id, int lnum) | |
252 | { | |
3a8d4642 | 253 | struct ubi_ltree_entry *le; |
801c135c AB |
254 | |
255 | le = ltree_add_entry(ubi, vol_id, lnum); | |
256 | if (IS_ERR(le)) | |
257 | return PTR_ERR(le); | |
258 | down_write(&le->mutex); | |
259 | return 0; | |
260 | } | |
261 | ||
262 | /** | |
263 | * leb_write_unlock - unlock logical eraseblock. | |
264 | * @ubi: UBI device description object | |
265 | * @vol_id: volume ID | |
266 | * @lnum: logical eraseblock number | |
267 | */ | |
268 | static void leb_write_unlock(struct ubi_device *ubi, int vol_id, int lnum) | |
269 | { | |
270 | int free; | |
3a8d4642 | 271 | struct ubi_ltree_entry *le; |
801c135c AB |
272 | |
273 | spin_lock(&ubi->ltree_lock); | |
274 | le = ltree_lookup(ubi, vol_id, lnum); | |
275 | le->users -= 1; | |
276 | ubi_assert(le->users >= 0); | |
277 | if (le->users == 0) { | |
278 | rb_erase(&le->rb, &ubi->ltree); | |
279 | free = 1; | |
280 | } else | |
281 | free = 0; | |
282 | spin_unlock(&ubi->ltree_lock); | |
283 | ||
284 | up_write(&le->mutex); | |
285 | if (free) | |
3a8d4642 | 286 | kmem_cache_free(ubi_ltree_slab, le); |
801c135c AB |
287 | } |
288 | ||
289 | /** | |
290 | * ubi_eba_unmap_leb - un-map logical eraseblock. | |
291 | * @ubi: UBI device description object | |
292 | * @vol_id: volume ID | |
293 | * @lnum: logical eraseblock number | |
294 | * | |
295 | * This function un-maps logical eraseblock @lnum and schedules corresponding | |
296 | * physical eraseblock for erasure. Returns zero in case of success and a | |
297 | * negative error code in case of failure. | |
298 | */ | |
299 | int ubi_eba_unmap_leb(struct ubi_device *ubi, int vol_id, int lnum) | |
300 | { | |
301 | int idx = vol_id2idx(ubi, vol_id), err, pnum; | |
302 | struct ubi_volume *vol = ubi->volumes[idx]; | |
303 | ||
304 | if (ubi->ro_mode) | |
305 | return -EROFS; | |
306 | ||
307 | err = leb_write_lock(ubi, vol_id, lnum); | |
308 | if (err) | |
309 | return err; | |
310 | ||
311 | pnum = vol->eba_tbl[lnum]; | |
312 | if (pnum < 0) | |
313 | /* This logical eraseblock is already unmapped */ | |
314 | goto out_unlock; | |
315 | ||
316 | dbg_eba("erase LEB %d:%d, PEB %d", vol_id, lnum, pnum); | |
317 | ||
318 | vol->eba_tbl[lnum] = UBI_LEB_UNMAPPED; | |
319 | err = ubi_wl_put_peb(ubi, pnum, 0); | |
320 | ||
321 | out_unlock: | |
322 | leb_write_unlock(ubi, vol_id, lnum); | |
323 | return err; | |
324 | } | |
325 | ||
326 | /** | |
327 | * ubi_eba_read_leb - read data. | |
328 | * @ubi: UBI device description object | |
329 | * @vol_id: volume ID | |
330 | * @lnum: logical eraseblock number | |
331 | * @buf: buffer to store the read data | |
332 | * @offset: offset from where to read | |
333 | * @len: how many bytes to read | |
334 | * @check: data CRC check flag | |
335 | * | |
336 | * If the logical eraseblock @lnum is unmapped, @buf is filled with 0xFF | |
337 | * bytes. The @check flag only makes sense for static volumes and forces | |
338 | * eraseblock data CRC checking. | |
339 | * | |
340 | * In case of success this function returns zero. In case of a static volume, | |
341 | * if data CRC mismatches - %-EBADMSG is returned. %-EBADMSG may also be | |
342 | * returned for any volume type if an ECC error was detected by the MTD device | |
343 | * driver. Other negative error cored may be returned in case of other errors. | |
344 | */ | |
345 | int ubi_eba_read_leb(struct ubi_device *ubi, int vol_id, int lnum, void *buf, | |
346 | int offset, int len, int check) | |
347 | { | |
348 | int err, pnum, scrub = 0, idx = vol_id2idx(ubi, vol_id); | |
349 | struct ubi_vid_hdr *vid_hdr; | |
350 | struct ubi_volume *vol = ubi->volumes[idx]; | |
a6343afb | 351 | uint32_t uninitialized_var(crc); |
801c135c AB |
352 | |
353 | err = leb_read_lock(ubi, vol_id, lnum); | |
354 | if (err) | |
355 | return err; | |
356 | ||
357 | pnum = vol->eba_tbl[lnum]; | |
358 | if (pnum < 0) { | |
359 | /* | |
360 | * The logical eraseblock is not mapped, fill the whole buffer | |
361 | * with 0xFF bytes. The exception is static volumes for which | |
362 | * it is an error to read unmapped logical eraseblocks. | |
363 | */ | |
364 | dbg_eba("read %d bytes from offset %d of LEB %d:%d (unmapped)", | |
365 | len, offset, vol_id, lnum); | |
366 | leb_read_unlock(ubi, vol_id, lnum); | |
367 | ubi_assert(vol->vol_type != UBI_STATIC_VOLUME); | |
368 | memset(buf, 0xFF, len); | |
369 | return 0; | |
370 | } | |
371 | ||
372 | dbg_eba("read %d bytes from offset %d of LEB %d:%d, PEB %d", | |
373 | len, offset, vol_id, lnum, pnum); | |
374 | ||
375 | if (vol->vol_type == UBI_DYNAMIC_VOLUME) | |
376 | check = 0; | |
377 | ||
378 | retry: | |
379 | if (check) { | |
33818bbb | 380 | vid_hdr = ubi_zalloc_vid_hdr(ubi, GFP_NOFS); |
801c135c AB |
381 | if (!vid_hdr) { |
382 | err = -ENOMEM; | |
383 | goto out_unlock; | |
384 | } | |
385 | ||
386 | err = ubi_io_read_vid_hdr(ubi, pnum, vid_hdr, 1); | |
387 | if (err && err != UBI_IO_BITFLIPS) { | |
388 | if (err > 0) { | |
389 | /* | |
390 | * The header is either absent or corrupted. | |
391 | * The former case means there is a bug - | |
392 | * switch to read-only mode just in case. | |
393 | * The latter case means a real corruption - we | |
394 | * may try to recover data. FIXME: but this is | |
395 | * not implemented. | |
396 | */ | |
397 | if (err == UBI_IO_BAD_VID_HDR) { | |
398 | ubi_warn("bad VID header at PEB %d, LEB" | |
399 | "%d:%d", pnum, vol_id, lnum); | |
400 | err = -EBADMSG; | |
401 | } else | |
402 | ubi_ro_mode(ubi); | |
403 | } | |
404 | goto out_free; | |
405 | } else if (err == UBI_IO_BITFLIPS) | |
406 | scrub = 1; | |
407 | ||
3261ebd7 CH |
408 | ubi_assert(lnum < be32_to_cpu(vid_hdr->used_ebs)); |
409 | ubi_assert(len == be32_to_cpu(vid_hdr->data_size)); | |
801c135c | 410 | |
3261ebd7 | 411 | crc = be32_to_cpu(vid_hdr->data_crc); |
801c135c AB |
412 | ubi_free_vid_hdr(ubi, vid_hdr); |
413 | } | |
414 | ||
415 | err = ubi_io_read_data(ubi, buf, pnum, offset, len); | |
416 | if (err) { | |
417 | if (err == UBI_IO_BITFLIPS) { | |
418 | scrub = 1; | |
419 | err = 0; | |
420 | } else if (err == -EBADMSG) { | |
421 | if (vol->vol_type == UBI_DYNAMIC_VOLUME) | |
422 | goto out_unlock; | |
423 | scrub = 1; | |
424 | if (!check) { | |
425 | ubi_msg("force data checking"); | |
426 | check = 1; | |
427 | goto retry; | |
428 | } | |
429 | } else | |
430 | goto out_unlock; | |
431 | } | |
432 | ||
433 | if (check) { | |
2ab934b8 | 434 | uint32_t crc1 = crc32(UBI_CRC32_INIT, buf, len); |
801c135c AB |
435 | if (crc1 != crc) { |
436 | ubi_warn("CRC error: calculated %#08x, must be %#08x", | |
437 | crc1, crc); | |
438 | err = -EBADMSG; | |
439 | goto out_unlock; | |
440 | } | |
441 | } | |
442 | ||
443 | if (scrub) | |
444 | err = ubi_wl_scrub_peb(ubi, pnum); | |
445 | ||
446 | leb_read_unlock(ubi, vol_id, lnum); | |
447 | return err; | |
448 | ||
449 | out_free: | |
450 | ubi_free_vid_hdr(ubi, vid_hdr); | |
451 | out_unlock: | |
452 | leb_read_unlock(ubi, vol_id, lnum); | |
453 | return err; | |
454 | } | |
455 | ||
456 | /** | |
457 | * recover_peb - recover from write failure. | |
458 | * @ubi: UBI device description object | |
459 | * @pnum: the physical eraseblock to recover | |
460 | * @vol_id: volume ID | |
461 | * @lnum: logical eraseblock number | |
462 | * @buf: data which was not written because of the write failure | |
463 | * @offset: offset of the failed write | |
464 | * @len: how many bytes should have been written | |
465 | * | |
466 | * This function is called in case of a write failure and moves all good data | |
467 | * from the potentially bad physical eraseblock to a good physical eraseblock. | |
468 | * This function also writes the data which was not written due to the failure. | |
469 | * Returns new physical eraseblock number in case of success, and a negative | |
470 | * error code in case of failure. | |
471 | */ | |
472 | static int recover_peb(struct ubi_device *ubi, int pnum, int vol_id, int lnum, | |
473 | const void *buf, int offset, int len) | |
474 | { | |
475 | int err, idx = vol_id2idx(ubi, vol_id), new_pnum, data_size, tries = 0; | |
476 | struct ubi_volume *vol = ubi->volumes[idx]; | |
477 | struct ubi_vid_hdr *vid_hdr; | |
801c135c | 478 | |
33818bbb | 479 | vid_hdr = ubi_zalloc_vid_hdr(ubi, GFP_NOFS); |
801c135c AB |
480 | if (!vid_hdr) { |
481 | return -ENOMEM; | |
482 | } | |
483 | ||
e88d6e10 AB |
484 | mutex_lock(&ubi->buf_mutex); |
485 | ||
801c135c AB |
486 | retry: |
487 | new_pnum = ubi_wl_get_peb(ubi, UBI_UNKNOWN); | |
488 | if (new_pnum < 0) { | |
e88d6e10 | 489 | mutex_unlock(&ubi->buf_mutex); |
801c135c AB |
490 | ubi_free_vid_hdr(ubi, vid_hdr); |
491 | return new_pnum; | |
492 | } | |
493 | ||
494 | ubi_msg("recover PEB %d, move data to PEB %d", pnum, new_pnum); | |
495 | ||
496 | err = ubi_io_read_vid_hdr(ubi, pnum, vid_hdr, 1); | |
497 | if (err && err != UBI_IO_BITFLIPS) { | |
498 | if (err > 0) | |
499 | err = -EIO; | |
500 | goto out_put; | |
501 | } | |
502 | ||
3261ebd7 | 503 | vid_hdr->sqnum = cpu_to_be64(next_sqnum(ubi)); |
801c135c AB |
504 | err = ubi_io_write_vid_hdr(ubi, new_pnum, vid_hdr); |
505 | if (err) | |
506 | goto write_error; | |
507 | ||
508 | data_size = offset + len; | |
e88d6e10 | 509 | memset(ubi->peb_buf1 + offset, 0xFF, len); |
801c135c AB |
510 | |
511 | /* Read everything before the area where the write failure happened */ | |
512 | if (offset > 0) { | |
e88d6e10 AB |
513 | err = ubi_io_read_data(ubi, ubi->peb_buf1, pnum, 0, offset); |
514 | if (err && err != UBI_IO_BITFLIPS) | |
801c135c | 515 | goto out_put; |
801c135c AB |
516 | } |
517 | ||
e88d6e10 | 518 | memcpy(ubi->peb_buf1 + offset, buf, len); |
801c135c | 519 | |
e88d6e10 AB |
520 | err = ubi_io_write_data(ubi, ubi->peb_buf1, new_pnum, 0, data_size); |
521 | if (err) | |
801c135c | 522 | goto write_error; |
801c135c | 523 | |
e88d6e10 | 524 | mutex_unlock(&ubi->buf_mutex); |
801c135c AB |
525 | ubi_free_vid_hdr(ubi, vid_hdr); |
526 | ||
527 | vol->eba_tbl[lnum] = new_pnum; | |
528 | ubi_wl_put_peb(ubi, pnum, 1); | |
529 | ||
530 | ubi_msg("data was successfully recovered"); | |
531 | return 0; | |
532 | ||
533 | out_put: | |
e88d6e10 | 534 | mutex_unlock(&ubi->buf_mutex); |
801c135c AB |
535 | ubi_wl_put_peb(ubi, new_pnum, 1); |
536 | ubi_free_vid_hdr(ubi, vid_hdr); | |
537 | return err; | |
538 | ||
539 | write_error: | |
540 | /* | |
541 | * Bad luck? This physical eraseblock is bad too? Crud. Let's try to | |
542 | * get another one. | |
543 | */ | |
544 | ubi_warn("failed to write to PEB %d", new_pnum); | |
545 | ubi_wl_put_peb(ubi, new_pnum, 1); | |
546 | if (++tries > UBI_IO_RETRIES) { | |
e88d6e10 | 547 | mutex_unlock(&ubi->buf_mutex); |
801c135c AB |
548 | ubi_free_vid_hdr(ubi, vid_hdr); |
549 | return err; | |
550 | } | |
551 | ubi_msg("try again"); | |
552 | goto retry; | |
553 | } | |
554 | ||
555 | /** | |
556 | * ubi_eba_write_leb - write data to dynamic volume. | |
557 | * @ubi: UBI device description object | |
558 | * @vol_id: volume ID | |
559 | * @lnum: logical eraseblock number | |
560 | * @buf: the data to write | |
561 | * @offset: offset within the logical eraseblock where to write | |
562 | * @len: how many bytes to write | |
563 | * @dtype: data type | |
564 | * | |
565 | * This function writes data to logical eraseblock @lnum of a dynamic volume | |
566 | * @vol_id. Returns zero in case of success and a negative error code in case | |
567 | * of failure. In case of error, it is possible that something was still | |
568 | * written to the flash media, but may be some garbage. | |
569 | */ | |
570 | int ubi_eba_write_leb(struct ubi_device *ubi, int vol_id, int lnum, | |
571 | const void *buf, int offset, int len, int dtype) | |
572 | { | |
573 | int idx = vol_id2idx(ubi, vol_id), err, pnum, tries = 0; | |
574 | struct ubi_volume *vol = ubi->volumes[idx]; | |
575 | struct ubi_vid_hdr *vid_hdr; | |
576 | ||
577 | if (ubi->ro_mode) | |
578 | return -EROFS; | |
579 | ||
580 | err = leb_write_lock(ubi, vol_id, lnum); | |
581 | if (err) | |
582 | return err; | |
583 | ||
584 | pnum = vol->eba_tbl[lnum]; | |
585 | if (pnum >= 0) { | |
586 | dbg_eba("write %d bytes at offset %d of LEB %d:%d, PEB %d", | |
587 | len, offset, vol_id, lnum, pnum); | |
588 | ||
589 | err = ubi_io_write_data(ubi, buf, pnum, offset, len); | |
590 | if (err) { | |
591 | ubi_warn("failed to write data to PEB %d", pnum); | |
592 | if (err == -EIO && ubi->bad_allowed) | |
593 | err = recover_peb(ubi, pnum, vol_id, lnum, buf, offset, len); | |
594 | if (err) | |
595 | ubi_ro_mode(ubi); | |
596 | } | |
597 | leb_write_unlock(ubi, vol_id, lnum); | |
598 | return err; | |
599 | } | |
600 | ||
601 | /* | |
602 | * The logical eraseblock is not mapped. We have to get a free physical | |
603 | * eraseblock and write the volume identifier header there first. | |
604 | */ | |
33818bbb | 605 | vid_hdr = ubi_zalloc_vid_hdr(ubi, GFP_NOFS); |
801c135c AB |
606 | if (!vid_hdr) { |
607 | leb_write_unlock(ubi, vol_id, lnum); | |
608 | return -ENOMEM; | |
609 | } | |
610 | ||
611 | vid_hdr->vol_type = UBI_VID_DYNAMIC; | |
3261ebd7 CH |
612 | vid_hdr->sqnum = cpu_to_be64(next_sqnum(ubi)); |
613 | vid_hdr->vol_id = cpu_to_be32(vol_id); | |
614 | vid_hdr->lnum = cpu_to_be32(lnum); | |
801c135c | 615 | vid_hdr->compat = ubi_get_compat(ubi, vol_id); |
3261ebd7 | 616 | vid_hdr->data_pad = cpu_to_be32(vol->data_pad); |
801c135c AB |
617 | |
618 | retry: | |
619 | pnum = ubi_wl_get_peb(ubi, dtype); | |
620 | if (pnum < 0) { | |
621 | ubi_free_vid_hdr(ubi, vid_hdr); | |
622 | leb_write_unlock(ubi, vol_id, lnum); | |
623 | return pnum; | |
624 | } | |
625 | ||
626 | dbg_eba("write VID hdr and %d bytes at offset %d of LEB %d:%d, PEB %d", | |
627 | len, offset, vol_id, lnum, pnum); | |
628 | ||
629 | err = ubi_io_write_vid_hdr(ubi, pnum, vid_hdr); | |
630 | if (err) { | |
631 | ubi_warn("failed to write VID header to LEB %d:%d, PEB %d", | |
632 | vol_id, lnum, pnum); | |
633 | goto write_error; | |
634 | } | |
635 | ||
393852ec AB |
636 | if (len) { |
637 | err = ubi_io_write_data(ubi, buf, pnum, offset, len); | |
638 | if (err) { | |
639 | ubi_warn("failed to write %d bytes at offset %d of " | |
640 | "LEB %d:%d, PEB %d", len, offset, vol_id, | |
641 | lnum, pnum); | |
642 | goto write_error; | |
643 | } | |
801c135c AB |
644 | } |
645 | ||
646 | vol->eba_tbl[lnum] = pnum; | |
647 | ||
648 | leb_write_unlock(ubi, vol_id, lnum); | |
649 | ubi_free_vid_hdr(ubi, vid_hdr); | |
650 | return 0; | |
651 | ||
652 | write_error: | |
653 | if (err != -EIO || !ubi->bad_allowed) { | |
654 | ubi_ro_mode(ubi); | |
655 | leb_write_unlock(ubi, vol_id, lnum); | |
656 | ubi_free_vid_hdr(ubi, vid_hdr); | |
657 | return err; | |
658 | } | |
659 | ||
660 | /* | |
661 | * Fortunately, this is the first write operation to this physical | |
662 | * eraseblock, so just put it and request a new one. We assume that if | |
663 | * this physical eraseblock went bad, the erase code will handle that. | |
664 | */ | |
665 | err = ubi_wl_put_peb(ubi, pnum, 1); | |
666 | if (err || ++tries > UBI_IO_RETRIES) { | |
667 | ubi_ro_mode(ubi); | |
668 | leb_write_unlock(ubi, vol_id, lnum); | |
669 | ubi_free_vid_hdr(ubi, vid_hdr); | |
670 | return err; | |
671 | } | |
672 | ||
3261ebd7 | 673 | vid_hdr->sqnum = cpu_to_be64(next_sqnum(ubi)); |
801c135c AB |
674 | ubi_msg("try another PEB"); |
675 | goto retry; | |
676 | } | |
677 | ||
678 | /** | |
679 | * ubi_eba_write_leb_st - write data to static volume. | |
680 | * @ubi: UBI device description object | |
681 | * @vol_id: volume ID | |
682 | * @lnum: logical eraseblock number | |
683 | * @buf: data to write | |
684 | * @len: how many bytes to write | |
685 | * @dtype: data type | |
686 | * @used_ebs: how many logical eraseblocks will this volume contain | |
687 | * | |
688 | * This function writes data to logical eraseblock @lnum of static volume | |
689 | * @vol_id. The @used_ebs argument should contain total number of logical | |
690 | * eraseblock in this static volume. | |
691 | * | |
692 | * When writing to the last logical eraseblock, the @len argument doesn't have | |
693 | * to be aligned to the minimal I/O unit size. Instead, it has to be equivalent | |
694 | * to the real data size, although the @buf buffer has to contain the | |
695 | * alignment. In all other cases, @len has to be aligned. | |
696 | * | |
697 | * It is prohibited to write more then once to logical eraseblocks of static | |
698 | * volumes. This function returns zero in case of success and a negative error | |
699 | * code in case of failure. | |
700 | */ | |
701 | int ubi_eba_write_leb_st(struct ubi_device *ubi, int vol_id, int lnum, | |
702 | const void *buf, int len, int dtype, int used_ebs) | |
703 | { | |
704 | int err, pnum, tries = 0, data_size = len; | |
705 | int idx = vol_id2idx(ubi, vol_id); | |
706 | struct ubi_volume *vol = ubi->volumes[idx]; | |
707 | struct ubi_vid_hdr *vid_hdr; | |
708 | uint32_t crc; | |
709 | ||
710 | if (ubi->ro_mode) | |
711 | return -EROFS; | |
712 | ||
713 | if (lnum == used_ebs - 1) | |
714 | /* If this is the last LEB @len may be unaligned */ | |
715 | len = ALIGN(data_size, ubi->min_io_size); | |
716 | else | |
717 | ubi_assert(len % ubi->min_io_size == 0); | |
718 | ||
33818bbb | 719 | vid_hdr = ubi_zalloc_vid_hdr(ubi, GFP_NOFS); |
801c135c AB |
720 | if (!vid_hdr) |
721 | return -ENOMEM; | |
722 | ||
723 | err = leb_write_lock(ubi, vol_id, lnum); | |
724 | if (err) { | |
725 | ubi_free_vid_hdr(ubi, vid_hdr); | |
726 | return err; | |
727 | } | |
728 | ||
3261ebd7 CH |
729 | vid_hdr->sqnum = cpu_to_be64(next_sqnum(ubi)); |
730 | vid_hdr->vol_id = cpu_to_be32(vol_id); | |
731 | vid_hdr->lnum = cpu_to_be32(lnum); | |
801c135c | 732 | vid_hdr->compat = ubi_get_compat(ubi, vol_id); |
3261ebd7 | 733 | vid_hdr->data_pad = cpu_to_be32(vol->data_pad); |
801c135c AB |
734 | |
735 | crc = crc32(UBI_CRC32_INIT, buf, data_size); | |
736 | vid_hdr->vol_type = UBI_VID_STATIC; | |
3261ebd7 CH |
737 | vid_hdr->data_size = cpu_to_be32(data_size); |
738 | vid_hdr->used_ebs = cpu_to_be32(used_ebs); | |
739 | vid_hdr->data_crc = cpu_to_be32(crc); | |
801c135c AB |
740 | |
741 | retry: | |
742 | pnum = ubi_wl_get_peb(ubi, dtype); | |
743 | if (pnum < 0) { | |
744 | ubi_free_vid_hdr(ubi, vid_hdr); | |
745 | leb_write_unlock(ubi, vol_id, lnum); | |
746 | return pnum; | |
747 | } | |
748 | ||
749 | dbg_eba("write VID hdr and %d bytes at LEB %d:%d, PEB %d, used_ebs %d", | |
750 | len, vol_id, lnum, pnum, used_ebs); | |
751 | ||
752 | err = ubi_io_write_vid_hdr(ubi, pnum, vid_hdr); | |
753 | if (err) { | |
754 | ubi_warn("failed to write VID header to LEB %d:%d, PEB %d", | |
755 | vol_id, lnum, pnum); | |
756 | goto write_error; | |
757 | } | |
758 | ||
759 | err = ubi_io_write_data(ubi, buf, pnum, 0, len); | |
760 | if (err) { | |
761 | ubi_warn("failed to write %d bytes of data to PEB %d", | |
762 | len, pnum); | |
763 | goto write_error; | |
764 | } | |
765 | ||
766 | ubi_assert(vol->eba_tbl[lnum] < 0); | |
767 | vol->eba_tbl[lnum] = pnum; | |
768 | ||
769 | leb_write_unlock(ubi, vol_id, lnum); | |
770 | ubi_free_vid_hdr(ubi, vid_hdr); | |
771 | return 0; | |
772 | ||
773 | write_error: | |
774 | if (err != -EIO || !ubi->bad_allowed) { | |
775 | /* | |
776 | * This flash device does not admit of bad eraseblocks or | |
777 | * something nasty and unexpected happened. Switch to read-only | |
778 | * mode just in case. | |
779 | */ | |
780 | ubi_ro_mode(ubi); | |
781 | leb_write_unlock(ubi, vol_id, lnum); | |
782 | ubi_free_vid_hdr(ubi, vid_hdr); | |
783 | return err; | |
784 | } | |
785 | ||
786 | err = ubi_wl_put_peb(ubi, pnum, 1); | |
787 | if (err || ++tries > UBI_IO_RETRIES) { | |
788 | ubi_ro_mode(ubi); | |
789 | leb_write_unlock(ubi, vol_id, lnum); | |
790 | ubi_free_vid_hdr(ubi, vid_hdr); | |
791 | return err; | |
792 | } | |
793 | ||
3261ebd7 | 794 | vid_hdr->sqnum = cpu_to_be64(next_sqnum(ubi)); |
801c135c AB |
795 | ubi_msg("try another PEB"); |
796 | goto retry; | |
797 | } | |
798 | ||
799 | /* | |
800 | * ubi_eba_atomic_leb_change - change logical eraseblock atomically. | |
801 | * @ubi: UBI device description object | |
802 | * @vol_id: volume ID | |
803 | * @lnum: logical eraseblock number | |
804 | * @buf: data to write | |
805 | * @len: how many bytes to write | |
806 | * @dtype: data type | |
807 | * | |
808 | * This function changes the contents of a logical eraseblock atomically. @buf | |
809 | * has to contain new logical eraseblock data, and @len - the length of the | |
810 | * data, which has to be aligned. This function guarantees that in case of an | |
811 | * unclean reboot the old contents is preserved. Returns zero in case of | |
812 | * success and a negative error code in case of failure. | |
e8823bd6 AB |
813 | * |
814 | * UBI reserves one LEB for the "atomic LEB change" operation, so only one | |
815 | * LEB change may be done at a time. This is ensured by @ubi->alc_mutex. | |
801c135c AB |
816 | */ |
817 | int ubi_eba_atomic_leb_change(struct ubi_device *ubi, int vol_id, int lnum, | |
818 | const void *buf, int len, int dtype) | |
819 | { | |
820 | int err, pnum, tries = 0, idx = vol_id2idx(ubi, vol_id); | |
821 | struct ubi_volume *vol = ubi->volumes[idx]; | |
822 | struct ubi_vid_hdr *vid_hdr; | |
823 | uint32_t crc; | |
824 | ||
825 | if (ubi->ro_mode) | |
826 | return -EROFS; | |
827 | ||
33818bbb | 828 | vid_hdr = ubi_zalloc_vid_hdr(ubi, GFP_NOFS); |
801c135c AB |
829 | if (!vid_hdr) |
830 | return -ENOMEM; | |
831 | ||
e8823bd6 | 832 | mutex_lock(&ubi->alc_mutex); |
801c135c | 833 | err = leb_write_lock(ubi, vol_id, lnum); |
e8823bd6 AB |
834 | if (err) |
835 | goto out_mutex; | |
801c135c | 836 | |
3261ebd7 CH |
837 | vid_hdr->sqnum = cpu_to_be64(next_sqnum(ubi)); |
838 | vid_hdr->vol_id = cpu_to_be32(vol_id); | |
839 | vid_hdr->lnum = cpu_to_be32(lnum); | |
801c135c | 840 | vid_hdr->compat = ubi_get_compat(ubi, vol_id); |
3261ebd7 | 841 | vid_hdr->data_pad = cpu_to_be32(vol->data_pad); |
801c135c AB |
842 | |
843 | crc = crc32(UBI_CRC32_INIT, buf, len); | |
84a92580 | 844 | vid_hdr->vol_type = UBI_VID_DYNAMIC; |
3261ebd7 | 845 | vid_hdr->data_size = cpu_to_be32(len); |
801c135c | 846 | vid_hdr->copy_flag = 1; |
3261ebd7 | 847 | vid_hdr->data_crc = cpu_to_be32(crc); |
801c135c AB |
848 | |
849 | retry: | |
850 | pnum = ubi_wl_get_peb(ubi, dtype); | |
851 | if (pnum < 0) { | |
e8823bd6 AB |
852 | err = pnum; |
853 | goto out_leb_unlock; | |
801c135c AB |
854 | } |
855 | ||
856 | dbg_eba("change LEB %d:%d, PEB %d, write VID hdr to PEB %d", | |
857 | vol_id, lnum, vol->eba_tbl[lnum], pnum); | |
858 | ||
859 | err = ubi_io_write_vid_hdr(ubi, pnum, vid_hdr); | |
860 | if (err) { | |
861 | ubi_warn("failed to write VID header to LEB %d:%d, PEB %d", | |
862 | vol_id, lnum, pnum); | |
863 | goto write_error; | |
864 | } | |
865 | ||
866 | err = ubi_io_write_data(ubi, buf, pnum, 0, len); | |
867 | if (err) { | |
868 | ubi_warn("failed to write %d bytes of data to PEB %d", | |
869 | len, pnum); | |
870 | goto write_error; | |
871 | } | |
872 | ||
a443db48 AB |
873 | if (vol->eba_tbl[lnum] >= 0) { |
874 | err = ubi_wl_put_peb(ubi, vol->eba_tbl[lnum], 1); | |
e8823bd6 AB |
875 | if (err) |
876 | goto out_leb_unlock; | |
801c135c AB |
877 | } |
878 | ||
879 | vol->eba_tbl[lnum] = pnum; | |
e8823bd6 AB |
880 | |
881 | out_leb_unlock: | |
801c135c | 882 | leb_write_unlock(ubi, vol_id, lnum); |
e8823bd6 AB |
883 | out_mutex: |
884 | mutex_unlock(&ubi->alc_mutex); | |
801c135c | 885 | ubi_free_vid_hdr(ubi, vid_hdr); |
e8823bd6 | 886 | return err; |
801c135c AB |
887 | |
888 | write_error: | |
889 | if (err != -EIO || !ubi->bad_allowed) { | |
890 | /* | |
891 | * This flash device does not admit of bad eraseblocks or | |
892 | * something nasty and unexpected happened. Switch to read-only | |
893 | * mode just in case. | |
894 | */ | |
895 | ubi_ro_mode(ubi); | |
e8823bd6 | 896 | goto out_leb_unlock; |
801c135c AB |
897 | } |
898 | ||
899 | err = ubi_wl_put_peb(ubi, pnum, 1); | |
900 | if (err || ++tries > UBI_IO_RETRIES) { | |
901 | ubi_ro_mode(ubi); | |
e8823bd6 | 902 | goto out_leb_unlock; |
801c135c AB |
903 | } |
904 | ||
3261ebd7 | 905 | vid_hdr->sqnum = cpu_to_be64(next_sqnum(ubi)); |
801c135c AB |
906 | ubi_msg("try another PEB"); |
907 | goto retry; | |
908 | } | |
909 | ||
801c135c AB |
910 | /** |
911 | * ubi_eba_copy_leb - copy logical eraseblock. | |
912 | * @ubi: UBI device description object | |
913 | * @from: physical eraseblock number from where to copy | |
914 | * @to: physical eraseblock number where to copy | |
915 | * @vid_hdr: VID header of the @from physical eraseblock | |
916 | * | |
917 | * This function copies logical eraseblock from physical eraseblock @from to | |
918 | * physical eraseblock @to. The @vid_hdr buffer may be changed by this | |
919 | * function. Returns zero in case of success, %UBI_IO_BITFLIPS if the operation | |
920 | * was canceled because bit-flips were detected at the target PEB, and a | |
921 | * negative error code in case of failure. | |
922 | */ | |
923 | int ubi_eba_copy_leb(struct ubi_device *ubi, int from, int to, | |
924 | struct ubi_vid_hdr *vid_hdr) | |
925 | { | |
926 | int err, vol_id, lnum, data_size, aldata_size, pnum, idx; | |
927 | struct ubi_volume *vol; | |
928 | uint32_t crc; | |
801c135c | 929 | |
3261ebd7 CH |
930 | vol_id = be32_to_cpu(vid_hdr->vol_id); |
931 | lnum = be32_to_cpu(vid_hdr->lnum); | |
801c135c AB |
932 | |
933 | dbg_eba("copy LEB %d:%d, PEB %d to PEB %d", vol_id, lnum, from, to); | |
934 | ||
935 | if (vid_hdr->vol_type == UBI_VID_STATIC) { | |
3261ebd7 | 936 | data_size = be32_to_cpu(vid_hdr->data_size); |
801c135c AB |
937 | aldata_size = ALIGN(data_size, ubi->min_io_size); |
938 | } else | |
939 | data_size = aldata_size = | |
3261ebd7 | 940 | ubi->leb_size - be32_to_cpu(vid_hdr->data_pad); |
801c135c | 941 | |
801c135c AB |
942 | /* |
943 | * We do not want anybody to write to this logical eraseblock while we | |
944 | * are moving it, so we lock it. | |
945 | */ | |
946 | err = leb_write_lock(ubi, vol_id, lnum); | |
e88d6e10 | 947 | if (err) |
801c135c | 948 | return err; |
e88d6e10 AB |
949 | |
950 | mutex_lock(&ubi->buf_mutex); | |
801c135c AB |
951 | |
952 | /* | |
953 | * But the logical eraseblock might have been put by this time. | |
954 | * Cancel if it is true. | |
955 | */ | |
956 | idx = vol_id2idx(ubi, vol_id); | |
957 | ||
958 | /* | |
959 | * We may race with volume deletion/re-size, so we have to hold | |
960 | * @ubi->volumes_lock. | |
961 | */ | |
962 | spin_lock(&ubi->volumes_lock); | |
963 | vol = ubi->volumes[idx]; | |
964 | if (!vol) { | |
965 | dbg_eba("volume %d was removed meanwhile", vol_id); | |
966 | spin_unlock(&ubi->volumes_lock); | |
967 | goto out_unlock; | |
968 | } | |
969 | ||
970 | pnum = vol->eba_tbl[lnum]; | |
971 | if (pnum != from) { | |
972 | dbg_eba("LEB %d:%d is no longer mapped to PEB %d, mapped to " | |
973 | "PEB %d, cancel", vol_id, lnum, from, pnum); | |
974 | spin_unlock(&ubi->volumes_lock); | |
975 | goto out_unlock; | |
976 | } | |
977 | spin_unlock(&ubi->volumes_lock); | |
978 | ||
979 | /* OK, now the LEB is locked and we can safely start moving it */ | |
980 | ||
981 | dbg_eba("read %d bytes of data", aldata_size); | |
e88d6e10 | 982 | err = ubi_io_read_data(ubi, ubi->peb_buf1, from, 0, aldata_size); |
801c135c AB |
983 | if (err && err != UBI_IO_BITFLIPS) { |
984 | ubi_warn("error %d while reading data from PEB %d", | |
985 | err, from); | |
986 | goto out_unlock; | |
987 | } | |
988 | ||
989 | /* | |
990 | * Now we have got to calculate how much data we have to to copy. In | |
991 | * case of a static volume it is fairly easy - the VID header contains | |
992 | * the data size. In case of a dynamic volume it is more difficult - we | |
993 | * have to read the contents, cut 0xFF bytes from the end and copy only | |
994 | * the first part. We must do this to avoid writing 0xFF bytes as it | |
995 | * may have some side-effects. And not only this. It is important not | |
996 | * to include those 0xFFs to CRC because later the they may be filled | |
997 | * by data. | |
998 | */ | |
999 | if (vid_hdr->vol_type == UBI_VID_DYNAMIC) | |
1000 | aldata_size = data_size = | |
e88d6e10 | 1001 | ubi_calc_data_len(ubi, ubi->peb_buf1, data_size); |
801c135c AB |
1002 | |
1003 | cond_resched(); | |
e88d6e10 | 1004 | crc = crc32(UBI_CRC32_INIT, ubi->peb_buf1, data_size); |
801c135c AB |
1005 | cond_resched(); |
1006 | ||
1007 | /* | |
1008 | * It may turn out to me that the whole @from physical eraseblock | |
1009 | * contains only 0xFF bytes. Then we have to only write the VID header | |
1010 | * and do not write any data. This also means we should not set | |
1011 | * @vid_hdr->copy_flag, @vid_hdr->data_size, and @vid_hdr->data_crc. | |
1012 | */ | |
1013 | if (data_size > 0) { | |
1014 | vid_hdr->copy_flag = 1; | |
3261ebd7 CH |
1015 | vid_hdr->data_size = cpu_to_be32(data_size); |
1016 | vid_hdr->data_crc = cpu_to_be32(crc); | |
801c135c | 1017 | } |
3261ebd7 | 1018 | vid_hdr->sqnum = cpu_to_be64(next_sqnum(ubi)); |
801c135c AB |
1019 | |
1020 | err = ubi_io_write_vid_hdr(ubi, to, vid_hdr); | |
1021 | if (err) | |
1022 | goto out_unlock; | |
1023 | ||
1024 | cond_resched(); | |
1025 | ||
1026 | /* Read the VID header back and check if it was written correctly */ | |
1027 | err = ubi_io_read_vid_hdr(ubi, to, vid_hdr, 1); | |
1028 | if (err) { | |
1029 | if (err != UBI_IO_BITFLIPS) | |
1030 | ubi_warn("cannot read VID header back from PEB %d", to); | |
1031 | goto out_unlock; | |
1032 | } | |
1033 | ||
1034 | if (data_size > 0) { | |
e88d6e10 | 1035 | err = ubi_io_write_data(ubi, ubi->peb_buf1, to, 0, aldata_size); |
801c135c AB |
1036 | if (err) |
1037 | goto out_unlock; | |
1038 | ||
e88d6e10 AB |
1039 | cond_resched(); |
1040 | ||
801c135c AB |
1041 | /* |
1042 | * We've written the data and are going to read it back to make | |
1043 | * sure it was written correctly. | |
1044 | */ | |
801c135c | 1045 | |
e88d6e10 | 1046 | err = ubi_io_read_data(ubi, ubi->peb_buf2, to, 0, aldata_size); |
801c135c AB |
1047 | if (err) { |
1048 | if (err != UBI_IO_BITFLIPS) | |
1049 | ubi_warn("cannot read data back from PEB %d", | |
1050 | to); | |
1051 | goto out_unlock; | |
1052 | } | |
1053 | ||
1054 | cond_resched(); | |
1055 | ||
e88d6e10 | 1056 | if (memcmp(ubi->peb_buf1, ubi->peb_buf2, aldata_size)) { |
801c135c AB |
1057 | ubi_warn("read data back from PEB %d - it is different", |
1058 | to); | |
1059 | goto out_unlock; | |
1060 | } | |
1061 | } | |
1062 | ||
1063 | ubi_assert(vol->eba_tbl[lnum] == from); | |
1064 | vol->eba_tbl[lnum] = to; | |
1065 | ||
801c135c | 1066 | out_unlock: |
e88d6e10 | 1067 | mutex_unlock(&ubi->buf_mutex); |
801c135c | 1068 | leb_write_unlock(ubi, vol_id, lnum); |
801c135c AB |
1069 | return err; |
1070 | } | |
1071 | ||
1072 | /** | |
1073 | * ubi_eba_init_scan - initialize the EBA unit using scanning information. | |
1074 | * @ubi: UBI device description object | |
1075 | * @si: scanning information | |
1076 | * | |
1077 | * This function returns zero in case of success and a negative error code in | |
1078 | * case of failure. | |
1079 | */ | |
1080 | int ubi_eba_init_scan(struct ubi_device *ubi, struct ubi_scan_info *si) | |
1081 | { | |
1082 | int i, j, err, num_volumes; | |
1083 | struct ubi_scan_volume *sv; | |
1084 | struct ubi_volume *vol; | |
1085 | struct ubi_scan_leb *seb; | |
1086 | struct rb_node *rb; | |
1087 | ||
1088 | dbg_eba("initialize EBA unit"); | |
1089 | ||
1090 | spin_lock_init(&ubi->ltree_lock); | |
e8823bd6 | 1091 | mutex_init(&ubi->alc_mutex); |
801c135c AB |
1092 | ubi->ltree = RB_ROOT; |
1093 | ||
801c135c AB |
1094 | ubi->global_sqnum = si->max_sqnum + 1; |
1095 | num_volumes = ubi->vtbl_slots + UBI_INT_VOL_COUNT; | |
1096 | ||
1097 | for (i = 0; i < num_volumes; i++) { | |
1098 | vol = ubi->volumes[i]; | |
1099 | if (!vol) | |
1100 | continue; | |
1101 | ||
1102 | cond_resched(); | |
1103 | ||
1104 | vol->eba_tbl = kmalloc(vol->reserved_pebs * sizeof(int), | |
1105 | GFP_KERNEL); | |
1106 | if (!vol->eba_tbl) { | |
1107 | err = -ENOMEM; | |
1108 | goto out_free; | |
1109 | } | |
1110 | ||
1111 | for (j = 0; j < vol->reserved_pebs; j++) | |
1112 | vol->eba_tbl[j] = UBI_LEB_UNMAPPED; | |
1113 | ||
1114 | sv = ubi_scan_find_sv(si, idx2vol_id(ubi, i)); | |
1115 | if (!sv) | |
1116 | continue; | |
1117 | ||
1118 | ubi_rb_for_each_entry(rb, seb, &sv->root, u.rb) { | |
1119 | if (seb->lnum >= vol->reserved_pebs) | |
1120 | /* | |
1121 | * This may happen in case of an unclean reboot | |
1122 | * during re-size. | |
1123 | */ | |
1124 | ubi_scan_move_to_list(sv, seb, &si->erase); | |
1125 | vol->eba_tbl[seb->lnum] = seb->pnum; | |
1126 | } | |
1127 | } | |
1128 | ||
94780d4d AB |
1129 | if (ubi->avail_pebs < EBA_RESERVED_PEBS) { |
1130 | ubi_err("no enough physical eraseblocks (%d, need %d)", | |
1131 | ubi->avail_pebs, EBA_RESERVED_PEBS); | |
1132 | err = -ENOSPC; | |
1133 | goto out_free; | |
1134 | } | |
1135 | ubi->avail_pebs -= EBA_RESERVED_PEBS; | |
1136 | ubi->rsvd_pebs += EBA_RESERVED_PEBS; | |
1137 | ||
801c135c AB |
1138 | if (ubi->bad_allowed) { |
1139 | ubi_calculate_reserved(ubi); | |
1140 | ||
1141 | if (ubi->avail_pebs < ubi->beb_rsvd_level) { | |
1142 | /* No enough free physical eraseblocks */ | |
1143 | ubi->beb_rsvd_pebs = ubi->avail_pebs; | |
1144 | ubi_warn("cannot reserve enough PEBs for bad PEB " | |
1145 | "handling, reserved %d, need %d", | |
1146 | ubi->beb_rsvd_pebs, ubi->beb_rsvd_level); | |
1147 | } else | |
1148 | ubi->beb_rsvd_pebs = ubi->beb_rsvd_level; | |
1149 | ||
1150 | ubi->avail_pebs -= ubi->beb_rsvd_pebs; | |
1151 | ubi->rsvd_pebs += ubi->beb_rsvd_pebs; | |
1152 | } | |
1153 | ||
1154 | dbg_eba("EBA unit is initialized"); | |
1155 | return 0; | |
1156 | ||
1157 | out_free: | |
1158 | for (i = 0; i < num_volumes; i++) { | |
1159 | if (!ubi->volumes[i]) | |
1160 | continue; | |
1161 | kfree(ubi->volumes[i]->eba_tbl); | |
1162 | } | |
801c135c AB |
1163 | return err; |
1164 | } | |
1165 | ||
1166 | /** | |
1167 | * ubi_eba_close - close EBA unit. | |
1168 | * @ubi: UBI device description object | |
1169 | */ | |
1170 | void ubi_eba_close(const struct ubi_device *ubi) | |
1171 | { | |
1172 | int i, num_volumes = ubi->vtbl_slots + UBI_INT_VOL_COUNT; | |
1173 | ||
1174 | dbg_eba("close EBA unit"); | |
1175 | ||
1176 | for (i = 0; i < num_volumes; i++) { | |
1177 | if (!ubi->volumes[i]) | |
1178 | continue; | |
1179 | kfree(ubi->volumes[i]->eba_tbl); | |
1180 | } | |
801c135c | 1181 | } |