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2d262c48 KP |
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 | /* This file mostly implements UBI kernel API functions */ | |
22 | ||
23 | #ifdef UBI_LINUX | |
24 | #include <linux/module.h> | |
25 | #include <linux/err.h> | |
26 | #include <asm/div64.h> | |
27 | #endif | |
28 | ||
29 | #include <ubi_uboot.h> | |
30 | #include "ubi.h" | |
31 | ||
32 | /** | |
33 | * ubi_get_device_info - get information about UBI device. | |
34 | * @ubi_num: UBI device number | |
35 | * @di: the information is stored here | |
36 | * | |
37 | * This function returns %0 in case of success, %-EINVAL if the UBI device | |
38 | * number is invalid, and %-ENODEV if there is no such UBI device. | |
39 | */ | |
40 | int ubi_get_device_info(int ubi_num, struct ubi_device_info *di) | |
41 | { | |
42 | struct ubi_device *ubi; | |
43 | ||
44 | if (ubi_num < 0 || ubi_num >= UBI_MAX_DEVICES) | |
45 | return -EINVAL; | |
46 | ||
47 | ubi = ubi_get_device(ubi_num); | |
48 | if (!ubi) | |
49 | return -ENODEV; | |
50 | ||
51 | di->ubi_num = ubi->ubi_num; | |
52 | di->leb_size = ubi->leb_size; | |
53 | di->min_io_size = ubi->min_io_size; | |
54 | di->ro_mode = ubi->ro_mode; | |
55 | di->cdev = ubi->cdev.dev; | |
56 | ||
57 | ubi_put_device(ubi); | |
58 | return 0; | |
59 | } | |
60 | EXPORT_SYMBOL_GPL(ubi_get_device_info); | |
61 | ||
62 | /** | |
63 | * ubi_get_volume_info - get information about UBI volume. | |
64 | * @desc: volume descriptor | |
65 | * @vi: the information is stored here | |
66 | */ | |
67 | void ubi_get_volume_info(struct ubi_volume_desc *desc, | |
68 | struct ubi_volume_info *vi) | |
69 | { | |
70 | const struct ubi_volume *vol = desc->vol; | |
71 | const struct ubi_device *ubi = vol->ubi; | |
72 | ||
73 | vi->vol_id = vol->vol_id; | |
74 | vi->ubi_num = ubi->ubi_num; | |
75 | vi->size = vol->reserved_pebs; | |
76 | vi->used_bytes = vol->used_bytes; | |
77 | vi->vol_type = vol->vol_type; | |
78 | vi->corrupted = vol->corrupted; | |
79 | vi->upd_marker = vol->upd_marker; | |
80 | vi->alignment = vol->alignment; | |
81 | vi->usable_leb_size = vol->usable_leb_size; | |
82 | vi->name_len = vol->name_len; | |
83 | vi->name = vol->name; | |
84 | vi->cdev = vol->cdev.dev; | |
85 | } | |
86 | EXPORT_SYMBOL_GPL(ubi_get_volume_info); | |
87 | ||
88 | /** | |
89 | * ubi_open_volume - open UBI volume. | |
90 | * @ubi_num: UBI device number | |
91 | * @vol_id: volume ID | |
92 | * @mode: open mode | |
93 | * | |
94 | * The @mode parameter specifies if the volume should be opened in read-only | |
95 | * mode, read-write mode, or exclusive mode. The exclusive mode guarantees that | |
96 | * nobody else will be able to open this volume. UBI allows to have many volume | |
97 | * readers and one writer at a time. | |
98 | * | |
99 | * If a static volume is being opened for the first time since boot, it will be | |
100 | * checked by this function, which means it will be fully read and the CRC | |
101 | * checksum of each logical eraseblock will be checked. | |
102 | * | |
103 | * This function returns volume descriptor in case of success and a negative | |
104 | * error code in case of failure. | |
105 | */ | |
106 | struct ubi_volume_desc *ubi_open_volume(int ubi_num, int vol_id, int mode) | |
107 | { | |
108 | int err; | |
109 | struct ubi_volume_desc *desc; | |
110 | struct ubi_device *ubi; | |
111 | struct ubi_volume *vol; | |
112 | ||
113 | dbg_msg("open device %d volume %d, mode %d", ubi_num, vol_id, mode); | |
114 | ||
115 | if (ubi_num < 0 || ubi_num >= UBI_MAX_DEVICES) | |
116 | return ERR_PTR(-EINVAL); | |
117 | ||
118 | if (mode != UBI_READONLY && mode != UBI_READWRITE && | |
119 | mode != UBI_EXCLUSIVE) | |
120 | return ERR_PTR(-EINVAL); | |
121 | ||
122 | /* | |
123 | * First of all, we have to get the UBI device to prevent its removal. | |
124 | */ | |
125 | ubi = ubi_get_device(ubi_num); | |
126 | if (!ubi) | |
127 | return ERR_PTR(-ENODEV); | |
128 | ||
129 | if (vol_id < 0 || vol_id >= ubi->vtbl_slots) { | |
130 | err = -EINVAL; | |
131 | goto out_put_ubi; | |
132 | } | |
133 | ||
134 | desc = kmalloc(sizeof(struct ubi_volume_desc), GFP_KERNEL); | |
135 | if (!desc) { | |
136 | err = -ENOMEM; | |
137 | goto out_put_ubi; | |
138 | } | |
139 | ||
140 | err = -ENODEV; | |
141 | if (!try_module_get(THIS_MODULE)) | |
142 | goto out_free; | |
143 | ||
144 | spin_lock(&ubi->volumes_lock); | |
145 | vol = ubi->volumes[vol_id]; | |
146 | if (!vol) | |
147 | goto out_unlock; | |
148 | ||
149 | err = -EBUSY; | |
150 | switch (mode) { | |
151 | case UBI_READONLY: | |
152 | if (vol->exclusive) | |
153 | goto out_unlock; | |
154 | vol->readers += 1; | |
155 | break; | |
156 | ||
157 | case UBI_READWRITE: | |
158 | if (vol->exclusive || vol->writers > 0) | |
159 | goto out_unlock; | |
160 | vol->writers += 1; | |
161 | break; | |
162 | ||
163 | case UBI_EXCLUSIVE: | |
164 | if (vol->exclusive || vol->writers || vol->readers) | |
165 | goto out_unlock; | |
166 | vol->exclusive = 1; | |
167 | break; | |
168 | } | |
169 | get_device(&vol->dev); | |
170 | vol->ref_count += 1; | |
171 | spin_unlock(&ubi->volumes_lock); | |
172 | ||
173 | desc->vol = vol; | |
174 | desc->mode = mode; | |
175 | ||
176 | mutex_lock(&ubi->ckvol_mutex); | |
177 | if (!vol->checked) { | |
178 | /* This is the first open - check the volume */ | |
179 | err = ubi_check_volume(ubi, vol_id); | |
180 | if (err < 0) { | |
181 | mutex_unlock(&ubi->ckvol_mutex); | |
182 | ubi_close_volume(desc); | |
183 | return ERR_PTR(err); | |
184 | } | |
185 | if (err == 1) { | |
186 | ubi_warn("volume %d on UBI device %d is corrupted", | |
187 | vol_id, ubi->ubi_num); | |
188 | vol->corrupted = 1; | |
189 | } | |
190 | vol->checked = 1; | |
191 | } | |
192 | mutex_unlock(&ubi->ckvol_mutex); | |
193 | ||
194 | return desc; | |
195 | ||
196 | out_unlock: | |
197 | spin_unlock(&ubi->volumes_lock); | |
198 | module_put(THIS_MODULE); | |
199 | out_free: | |
200 | kfree(desc); | |
201 | out_put_ubi: | |
202 | ubi_put_device(ubi); | |
203 | return ERR_PTR(err); | |
204 | } | |
205 | EXPORT_SYMBOL_GPL(ubi_open_volume); | |
206 | ||
207 | /** | |
208 | * ubi_open_volume_nm - open UBI volume by name. | |
209 | * @ubi_num: UBI device number | |
210 | * @name: volume name | |
211 | * @mode: open mode | |
212 | * | |
213 | * This function is similar to 'ubi_open_volume()', but opens a volume by name. | |
214 | */ | |
215 | struct ubi_volume_desc *ubi_open_volume_nm(int ubi_num, const char *name, | |
216 | int mode) | |
217 | { | |
218 | int i, vol_id = -1, len; | |
219 | struct ubi_device *ubi; | |
220 | struct ubi_volume_desc *ret; | |
221 | ||
222 | dbg_msg("open volume %s, mode %d", name, mode); | |
223 | ||
224 | if (!name) | |
225 | return ERR_PTR(-EINVAL); | |
226 | ||
227 | len = strnlen(name, UBI_VOL_NAME_MAX + 1); | |
228 | if (len > UBI_VOL_NAME_MAX) | |
229 | return ERR_PTR(-EINVAL); | |
230 | ||
231 | if (ubi_num < 0 || ubi_num >= UBI_MAX_DEVICES) | |
232 | return ERR_PTR(-EINVAL); | |
233 | ||
234 | ubi = ubi_get_device(ubi_num); | |
235 | if (!ubi) | |
236 | return ERR_PTR(-ENODEV); | |
237 | ||
238 | spin_lock(&ubi->volumes_lock); | |
239 | /* Walk all volumes of this UBI device */ | |
240 | for (i = 0; i < ubi->vtbl_slots; i++) { | |
241 | struct ubi_volume *vol = ubi->volumes[i]; | |
242 | ||
243 | if (vol && len == vol->name_len && !strcmp(name, vol->name)) { | |
244 | vol_id = i; | |
245 | break; | |
246 | } | |
247 | } | |
248 | spin_unlock(&ubi->volumes_lock); | |
249 | ||
250 | if (vol_id >= 0) | |
251 | ret = ubi_open_volume(ubi_num, vol_id, mode); | |
252 | else | |
253 | ret = ERR_PTR(-ENODEV); | |
254 | ||
255 | /* | |
256 | * We should put the UBI device even in case of success, because | |
257 | * 'ubi_open_volume()' took a reference as well. | |
258 | */ | |
259 | ubi_put_device(ubi); | |
260 | return ret; | |
261 | } | |
262 | EXPORT_SYMBOL_GPL(ubi_open_volume_nm); | |
263 | ||
264 | /** | |
265 | * ubi_close_volume - close UBI volume. | |
266 | * @desc: volume descriptor | |
267 | */ | |
268 | void ubi_close_volume(struct ubi_volume_desc *desc) | |
269 | { | |
270 | struct ubi_volume *vol = desc->vol; | |
271 | struct ubi_device *ubi = vol->ubi; | |
272 | ||
273 | dbg_msg("close volume %d, mode %d", vol->vol_id, desc->mode); | |
274 | ||
275 | spin_lock(&ubi->volumes_lock); | |
276 | switch (desc->mode) { | |
277 | case UBI_READONLY: | |
278 | vol->readers -= 1; | |
279 | break; | |
280 | case UBI_READWRITE: | |
281 | vol->writers -= 1; | |
282 | break; | |
283 | case UBI_EXCLUSIVE: | |
284 | vol->exclusive = 0; | |
285 | } | |
286 | vol->ref_count -= 1; | |
287 | spin_unlock(&ubi->volumes_lock); | |
288 | ||
289 | kfree(desc); | |
290 | put_device(&vol->dev); | |
291 | ubi_put_device(ubi); | |
292 | module_put(THIS_MODULE); | |
293 | } | |
294 | EXPORT_SYMBOL_GPL(ubi_close_volume); | |
295 | ||
296 | /** | |
297 | * ubi_leb_read - read data. | |
298 | * @desc: volume descriptor | |
299 | * @lnum: logical eraseblock number to read from | |
300 | * @buf: buffer where to store the read data | |
301 | * @offset: offset within the logical eraseblock to read from | |
302 | * @len: how many bytes to read | |
303 | * @check: whether UBI has to check the read data's CRC or not. | |
304 | * | |
305 | * This function reads data from offset @offset of logical eraseblock @lnum and | |
306 | * stores the data at @buf. When reading from static volumes, @check specifies | |
307 | * whether the data has to be checked or not. If yes, the whole logical | |
308 | * eraseblock will be read and its CRC checksum will be checked (i.e., the CRC | |
309 | * checksum is per-eraseblock). So checking may substantially slow down the | |
310 | * read speed. The @check argument is ignored for dynamic volumes. | |
311 | * | |
312 | * In case of success, this function returns zero. In case of failure, this | |
313 | * function returns a negative error code. | |
314 | * | |
315 | * %-EBADMSG error code is returned: | |
316 | * o for both static and dynamic volumes if MTD driver has detected a data | |
317 | * integrity problem (unrecoverable ECC checksum mismatch in case of NAND); | |
318 | * o for static volumes in case of data CRC mismatch. | |
319 | * | |
320 | * If the volume is damaged because of an interrupted update this function just | |
321 | * returns immediately with %-EBADF error code. | |
322 | */ | |
323 | int ubi_leb_read(struct ubi_volume_desc *desc, int lnum, char *buf, int offset, | |
324 | int len, int check) | |
325 | { | |
326 | struct ubi_volume *vol = desc->vol; | |
327 | struct ubi_device *ubi = vol->ubi; | |
328 | int err, vol_id = vol->vol_id; | |
329 | ||
330 | dbg_msg("read %d bytes from LEB %d:%d:%d", len, vol_id, lnum, offset); | |
331 | ||
332 | if (vol_id < 0 || vol_id >= ubi->vtbl_slots || lnum < 0 || | |
333 | lnum >= vol->used_ebs || offset < 0 || len < 0 || | |
334 | offset + len > vol->usable_leb_size) | |
335 | return -EINVAL; | |
336 | ||
337 | if (vol->vol_type == UBI_STATIC_VOLUME) { | |
338 | if (vol->used_ebs == 0) | |
339 | /* Empty static UBI volume */ | |
340 | return 0; | |
341 | if (lnum == vol->used_ebs - 1 && | |
342 | offset + len > vol->last_eb_bytes) | |
343 | return -EINVAL; | |
344 | } | |
345 | ||
346 | if (vol->upd_marker) | |
347 | return -EBADF; | |
348 | if (len == 0) | |
349 | return 0; | |
350 | ||
351 | err = ubi_eba_read_leb(ubi, vol, lnum, buf, offset, len, check); | |
dfe64e2c | 352 | if (err && mtd_is_eccerr(err) && vol->vol_type == UBI_STATIC_VOLUME) { |
2d262c48 KP |
353 | ubi_warn("mark volume %d as corrupted", vol_id); |
354 | vol->corrupted = 1; | |
355 | } | |
356 | ||
357 | return err; | |
358 | } | |
359 | EXPORT_SYMBOL_GPL(ubi_leb_read); | |
360 | ||
361 | /** | |
362 | * ubi_leb_write - write data. | |
363 | * @desc: volume descriptor | |
364 | * @lnum: logical eraseblock number to write to | |
365 | * @buf: data to write | |
366 | * @offset: offset within the logical eraseblock where to write | |
367 | * @len: how many bytes to write | |
368 | * @dtype: expected data type | |
369 | * | |
370 | * This function writes @len bytes of data from @buf to offset @offset of | |
371 | * logical eraseblock @lnum. The @dtype argument describes expected lifetime of | |
372 | * the data. | |
373 | * | |
374 | * This function takes care of physical eraseblock write failures. If write to | |
375 | * the physical eraseblock write operation fails, the logical eraseblock is | |
376 | * re-mapped to another physical eraseblock, the data is recovered, and the | |
377 | * write finishes. UBI has a pool of reserved physical eraseblocks for this. | |
378 | * | |
379 | * If all the data were successfully written, zero is returned. If an error | |
380 | * occurred and UBI has not been able to recover from it, this function returns | |
381 | * a negative error code. Note, in case of an error, it is possible that | |
382 | * something was still written to the flash media, but that may be some | |
383 | * garbage. | |
384 | * | |
385 | * If the volume is damaged because of an interrupted update this function just | |
386 | * returns immediately with %-EBADF code. | |
387 | */ | |
388 | int ubi_leb_write(struct ubi_volume_desc *desc, int lnum, const void *buf, | |
389 | int offset, int len, int dtype) | |
390 | { | |
391 | struct ubi_volume *vol = desc->vol; | |
392 | struct ubi_device *ubi = vol->ubi; | |
393 | int vol_id = vol->vol_id; | |
394 | ||
395 | dbg_msg("write %d bytes to LEB %d:%d:%d", len, vol_id, lnum, offset); | |
396 | ||
397 | if (vol_id < 0 || vol_id >= ubi->vtbl_slots) | |
398 | return -EINVAL; | |
399 | ||
400 | if (desc->mode == UBI_READONLY || vol->vol_type == UBI_STATIC_VOLUME) | |
401 | return -EROFS; | |
402 | ||
403 | if (lnum < 0 || lnum >= vol->reserved_pebs || offset < 0 || len < 0 || | |
404 | offset + len > vol->usable_leb_size || | |
405 | offset & (ubi->min_io_size - 1) || len & (ubi->min_io_size - 1)) | |
406 | return -EINVAL; | |
407 | ||
408 | if (dtype != UBI_LONGTERM && dtype != UBI_SHORTTERM && | |
409 | dtype != UBI_UNKNOWN) | |
410 | return -EINVAL; | |
411 | ||
412 | if (vol->upd_marker) | |
413 | return -EBADF; | |
414 | ||
415 | if (len == 0) | |
416 | return 0; | |
417 | ||
418 | return ubi_eba_write_leb(ubi, vol, lnum, buf, offset, len, dtype); | |
419 | } | |
420 | EXPORT_SYMBOL_GPL(ubi_leb_write); | |
421 | ||
422 | /* | |
423 | * ubi_leb_change - change logical eraseblock atomically. | |
424 | * @desc: volume descriptor | |
425 | * @lnum: logical eraseblock number to change | |
426 | * @buf: data to write | |
427 | * @len: how many bytes to write | |
428 | * @dtype: expected data type | |
429 | * | |
430 | * This function changes the contents of a logical eraseblock atomically. @buf | |
431 | * has to contain new logical eraseblock data, and @len - the length of the | |
432 | * data, which has to be aligned. The length may be shorter then the logical | |
433 | * eraseblock size, ant the logical eraseblock may be appended to more times | |
434 | * later on. This function guarantees that in case of an unclean reboot the old | |
435 | * contents is preserved. Returns zero in case of success and a negative error | |
436 | * code in case of failure. | |
437 | */ | |
438 | int ubi_leb_change(struct ubi_volume_desc *desc, int lnum, const void *buf, | |
439 | int len, int dtype) | |
440 | { | |
441 | struct ubi_volume *vol = desc->vol; | |
442 | struct ubi_device *ubi = vol->ubi; | |
443 | int vol_id = vol->vol_id; | |
444 | ||
445 | dbg_msg("atomically write %d bytes to LEB %d:%d", len, vol_id, lnum); | |
446 | ||
447 | if (vol_id < 0 || vol_id >= ubi->vtbl_slots) | |
448 | return -EINVAL; | |
449 | ||
450 | if (desc->mode == UBI_READONLY || vol->vol_type == UBI_STATIC_VOLUME) | |
451 | return -EROFS; | |
452 | ||
453 | if (lnum < 0 || lnum >= vol->reserved_pebs || len < 0 || | |
454 | len > vol->usable_leb_size || len & (ubi->min_io_size - 1)) | |
455 | return -EINVAL; | |
456 | ||
457 | if (dtype != UBI_LONGTERM && dtype != UBI_SHORTTERM && | |
458 | dtype != UBI_UNKNOWN) | |
459 | return -EINVAL; | |
460 | ||
461 | if (vol->upd_marker) | |
462 | return -EBADF; | |
463 | ||
464 | if (len == 0) | |
465 | return 0; | |
466 | ||
467 | return ubi_eba_atomic_leb_change(ubi, vol, lnum, buf, len, dtype); | |
468 | } | |
469 | EXPORT_SYMBOL_GPL(ubi_leb_change); | |
470 | ||
471 | /** | |
472 | * ubi_leb_erase - erase logical eraseblock. | |
473 | * @desc: volume descriptor | |
474 | * @lnum: logical eraseblock number | |
475 | * | |
476 | * This function un-maps logical eraseblock @lnum and synchronously erases the | |
477 | * correspondent physical eraseblock. Returns zero in case of success and a | |
478 | * negative error code in case of failure. | |
479 | * | |
480 | * If the volume is damaged because of an interrupted update this function just | |
481 | * returns immediately with %-EBADF code. | |
482 | */ | |
483 | int ubi_leb_erase(struct ubi_volume_desc *desc, int lnum) | |
484 | { | |
485 | struct ubi_volume *vol = desc->vol; | |
486 | struct ubi_device *ubi = vol->ubi; | |
487 | int err; | |
488 | ||
489 | dbg_msg("erase LEB %d:%d", vol->vol_id, lnum); | |
490 | ||
491 | if (desc->mode == UBI_READONLY || vol->vol_type == UBI_STATIC_VOLUME) | |
492 | return -EROFS; | |
493 | ||
494 | if (lnum < 0 || lnum >= vol->reserved_pebs) | |
495 | return -EINVAL; | |
496 | ||
497 | if (vol->upd_marker) | |
498 | return -EBADF; | |
499 | ||
500 | err = ubi_eba_unmap_leb(ubi, vol, lnum); | |
501 | if (err) | |
502 | return err; | |
503 | ||
504 | return ubi_wl_flush(ubi); | |
505 | } | |
506 | EXPORT_SYMBOL_GPL(ubi_leb_erase); | |
507 | ||
508 | /** | |
509 | * ubi_leb_unmap - un-map logical eraseblock. | |
510 | * @desc: volume descriptor | |
511 | * @lnum: logical eraseblock number | |
512 | * | |
513 | * This function un-maps logical eraseblock @lnum and schedules the | |
514 | * corresponding physical eraseblock for erasure, so that it will eventually be | |
515 | * physically erased in background. This operation is much faster then the | |
516 | * erase operation. | |
517 | * | |
518 | * Unlike erase, the un-map operation does not guarantee that the logical | |
519 | * eraseblock will contain all 0xFF bytes when UBI is initialized again. For | |
520 | * example, if several logical eraseblocks are un-mapped, and an unclean reboot | |
521 | * happens after this, the logical eraseblocks will not necessarily be | |
522 | * un-mapped again when this MTD device is attached. They may actually be | |
523 | * mapped to the same physical eraseblocks again. So, this function has to be | |
524 | * used with care. | |
525 | * | |
526 | * In other words, when un-mapping a logical eraseblock, UBI does not store | |
527 | * any information about this on the flash media, it just marks the logical | |
528 | * eraseblock as "un-mapped" in RAM. If UBI is detached before the physical | |
529 | * eraseblock is physically erased, it will be mapped again to the same logical | |
530 | * eraseblock when the MTD device is attached again. | |
531 | * | |
532 | * The main and obvious use-case of this function is when the contents of a | |
533 | * logical eraseblock has to be re-written. Then it is much more efficient to | |
534 | * first un-map it, then write new data, rather then first erase it, then write | |
535 | * new data. Note, once new data has been written to the logical eraseblock, | |
536 | * UBI guarantees that the old contents has gone forever. In other words, if an | |
537 | * unclean reboot happens after the logical eraseblock has been un-mapped and | |
538 | * then written to, it will contain the last written data. | |
539 | * | |
540 | * This function returns zero in case of success and a negative error code in | |
541 | * case of failure. If the volume is damaged because of an interrupted update | |
542 | * this function just returns immediately with %-EBADF code. | |
543 | */ | |
544 | int ubi_leb_unmap(struct ubi_volume_desc *desc, int lnum) | |
545 | { | |
546 | struct ubi_volume *vol = desc->vol; | |
547 | struct ubi_device *ubi = vol->ubi; | |
548 | ||
549 | dbg_msg("unmap LEB %d:%d", vol->vol_id, lnum); | |
550 | ||
551 | if (desc->mode == UBI_READONLY || vol->vol_type == UBI_STATIC_VOLUME) | |
552 | return -EROFS; | |
553 | ||
554 | if (lnum < 0 || lnum >= vol->reserved_pebs) | |
555 | return -EINVAL; | |
556 | ||
557 | if (vol->upd_marker) | |
558 | return -EBADF; | |
559 | ||
560 | return ubi_eba_unmap_leb(ubi, vol, lnum); | |
561 | } | |
562 | EXPORT_SYMBOL_GPL(ubi_leb_unmap); | |
563 | ||
564 | /** | |
565 | * ubi_leb_map - map logical erasblock to a physical eraseblock. | |
566 | * @desc: volume descriptor | |
567 | * @lnum: logical eraseblock number | |
568 | * @dtype: expected data type | |
569 | * | |
570 | * This function maps an un-mapped logical eraseblock @lnum to a physical | |
571 | * eraseblock. This means, that after a successfull invocation of this | |
572 | * function the logical eraseblock @lnum will be empty (contain only %0xFF | |
573 | * bytes) and be mapped to a physical eraseblock, even if an unclean reboot | |
574 | * happens. | |
575 | * | |
576 | * This function returns zero in case of success, %-EBADF if the volume is | |
577 | * damaged because of an interrupted update, %-EBADMSG if the logical | |
578 | * eraseblock is already mapped, and other negative error codes in case of | |
579 | * other failures. | |
580 | */ | |
581 | int ubi_leb_map(struct ubi_volume_desc *desc, int lnum, int dtype) | |
582 | { | |
583 | struct ubi_volume *vol = desc->vol; | |
584 | struct ubi_device *ubi = vol->ubi; | |
585 | ||
586 | dbg_msg("unmap LEB %d:%d", vol->vol_id, lnum); | |
587 | ||
588 | if (desc->mode == UBI_READONLY || vol->vol_type == UBI_STATIC_VOLUME) | |
589 | return -EROFS; | |
590 | ||
591 | if (lnum < 0 || lnum >= vol->reserved_pebs) | |
592 | return -EINVAL; | |
593 | ||
594 | if (dtype != UBI_LONGTERM && dtype != UBI_SHORTTERM && | |
595 | dtype != UBI_UNKNOWN) | |
596 | return -EINVAL; | |
597 | ||
598 | if (vol->upd_marker) | |
599 | return -EBADF; | |
600 | ||
601 | if (vol->eba_tbl[lnum] >= 0) | |
602 | return -EBADMSG; | |
603 | ||
604 | return ubi_eba_write_leb(ubi, vol, lnum, NULL, 0, 0, dtype); | |
605 | } | |
606 | EXPORT_SYMBOL_GPL(ubi_leb_map); | |
607 | ||
608 | /** | |
609 | * ubi_is_mapped - check if logical eraseblock is mapped. | |
610 | * @desc: volume descriptor | |
611 | * @lnum: logical eraseblock number | |
612 | * | |
613 | * This function checks if logical eraseblock @lnum is mapped to a physical | |
614 | * eraseblock. If a logical eraseblock is un-mapped, this does not necessarily | |
615 | * mean it will still be un-mapped after the UBI device is re-attached. The | |
616 | * logical eraseblock may become mapped to the physical eraseblock it was last | |
617 | * mapped to. | |
618 | * | |
619 | * This function returns %1 if the LEB is mapped, %0 if not, and a negative | |
620 | * error code in case of failure. If the volume is damaged because of an | |
621 | * interrupted update this function just returns immediately with %-EBADF error | |
622 | * code. | |
623 | */ | |
624 | int ubi_is_mapped(struct ubi_volume_desc *desc, int lnum) | |
625 | { | |
626 | struct ubi_volume *vol = desc->vol; | |
627 | ||
628 | dbg_msg("test LEB %d:%d", vol->vol_id, lnum); | |
629 | ||
630 | if (lnum < 0 || lnum >= vol->reserved_pebs) | |
631 | return -EINVAL; | |
632 | ||
633 | if (vol->upd_marker) | |
634 | return -EBADF; | |
635 | ||
636 | return vol->eba_tbl[lnum] >= 0; | |
637 | } | |
638 | EXPORT_SYMBOL_GPL(ubi_is_mapped); |