Commit | Line | Data |
---|---|---|
1a59d1b8 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
801c135c AB |
2 | /* |
3 | * Copyright (c) International Business Machines Corp., 2006 | |
4 | * Copyright (c) Nokia Corporation, 2006, 2007 | |
5 | * | |
801c135c AB |
6 | * Author: Artem Bityutskiy (Битюцкий Артём) |
7 | */ | |
8 | ||
9 | /* | |
85c6e6e2 | 10 | * UBI input/output sub-system. |
801c135c | 11 | * |
85c6e6e2 AB |
12 | * This sub-system provides a uniform way to work with all kinds of the |
13 | * underlying MTD devices. It also implements handy functions for reading and | |
14 | * writing UBI headers. | |
801c135c AB |
15 | * |
16 | * We are trying to have a paranoid mindset and not to trust to what we read | |
85c6e6e2 AB |
17 | * from the flash media in order to be more secure and robust. So this |
18 | * sub-system validates every single header it reads from the flash media. | |
801c135c AB |
19 | * |
20 | * Some words about how the eraseblock headers are stored. | |
21 | * | |
22 | * The erase counter header is always stored at offset zero. By default, the | |
23 | * VID header is stored after the EC header at the closest aligned offset | |
24 | * (i.e. aligned to the minimum I/O unit size). Data starts next to the VID | |
25 | * header at the closest aligned offset. But this default layout may be | |
26 | * changed. For example, for different reasons (e.g., optimization) UBI may be | |
27 | * asked to put the VID header at further offset, and even at an unaligned | |
28 | * offset. Of course, if the offset of the VID header is unaligned, UBI adds | |
29 | * proper padding in front of it. Data offset may also be changed but it has to | |
30 | * be aligned. | |
31 | * | |
32 | * About minimal I/O units. In general, UBI assumes flash device model where | |
33 | * there is only one minimal I/O unit size. E.g., in case of NOR flash it is 1, | |
34 | * in case of NAND flash it is a NAND page, etc. This is reported by MTD in the | |
2fae1312 | 35 | * @ubi->mtd->writesize field. But as an exception, UBI admits use of another |
801c135c AB |
36 | * (smaller) minimal I/O unit size for EC and VID headers to make it possible |
37 | * to do different optimizations. | |
38 | * | |
39 | * This is extremely useful in case of NAND flashes which admit of several | |
40 | * write operations to one NAND page. In this case UBI can fit EC and VID | |
41 | * headers at one NAND page. Thus, UBI may use "sub-page" size as the minimal | |
42 | * I/O unit for the headers (the @ubi->hdrs_min_io_size field). But it still | |
43 | * reports NAND page size (@ubi->min_io_size) as a minimal I/O unit for the UBI | |
44 | * users. | |
45 | * | |
46 | * Example: some Samsung NANDs with 2KiB pages allow 4x 512-byte writes, so | |
47 | * although the minimal I/O unit is 2K, UBI uses 512 bytes for EC and VID | |
48 | * headers. | |
49 | * | |
50 | * Q: why not just to treat sub-page as a minimal I/O unit of this flash | |
51 | * device, e.g., make @ubi->min_io_size = 512 in the example above? | |
52 | * | |
53 | * A: because when writing a sub-page, MTD still writes a full 2K page but the | |
be436f62 SK |
54 | * bytes which are not relevant to the sub-page are 0xFF. So, basically, |
55 | * writing 4x512 sub-pages is 4 times slower than writing one 2KiB NAND page. | |
56 | * Thus, we prefer to use sub-pages only for EC and VID headers. | |
801c135c AB |
57 | * |
58 | * As it was noted above, the VID header may start at a non-aligned offset. | |
59 | * For example, in case of a 2KiB page NAND flash with a 512 bytes sub-page, | |
60 | * the VID header may reside at offset 1984 which is the last 64 bytes of the | |
61 | * last sub-page (EC header is always at offset zero). This causes some | |
62 | * difficulties when reading and writing VID headers. | |
63 | * | |
64 | * Suppose we have a 64-byte buffer and we read a VID header at it. We change | |
65 | * the data and want to write this VID header out. As we can only write in | |
66 | * 512-byte chunks, we have to allocate one more buffer and copy our VID header | |
67 | * to offset 448 of this buffer. | |
68 | * | |
85c6e6e2 AB |
69 | * The I/O sub-system does the following trick in order to avoid this extra |
70 | * copy. It always allocates a @ubi->vid_hdr_alsize bytes buffer for the VID | |
71 | * header and returns a pointer to offset @ubi->vid_hdr_shift of this buffer. | |
72 | * When the VID header is being written out, it shifts the VID header pointer | |
73 | * back and writes the whole sub-page. | |
801c135c AB |
74 | */ |
75 | ||
76 | #include <linux/crc32.h> | |
77 | #include <linux/err.h> | |
5a0e3ad6 | 78 | #include <linux/slab.h> |
801c135c AB |
79 | #include "ubi.h" |
80 | ||
8056eb4a AB |
81 | static int self_check_not_bad(const struct ubi_device *ubi, int pnum); |
82 | static int self_check_peb_ec_hdr(const struct ubi_device *ubi, int pnum); | |
83 | static int self_check_ec_hdr(const struct ubi_device *ubi, int pnum, | |
84 | const struct ubi_ec_hdr *ec_hdr); | |
85 | static int self_check_peb_vid_hdr(const struct ubi_device *ubi, int pnum); | |
86 | static int self_check_vid_hdr(const struct ubi_device *ubi, int pnum, | |
87 | const struct ubi_vid_hdr *vid_hdr); | |
97d6104b AB |
88 | static int self_check_write(struct ubi_device *ubi, const void *buf, int pnum, |
89 | int offset, int len); | |
801c135c AB |
90 | |
91 | /** | |
92 | * ubi_io_read - read data from a physical eraseblock. | |
93 | * @ubi: UBI device description object | |
94 | * @buf: buffer where to store the read data | |
95 | * @pnum: physical eraseblock number to read from | |
96 | * @offset: offset within the physical eraseblock from where to read | |
97 | * @len: how many bytes to read | |
98 | * | |
99 | * This function reads data from offset @offset of physical eraseblock @pnum | |
100 | * and stores the read data in the @buf buffer. The following return codes are | |
101 | * possible: | |
102 | * | |
103 | * o %0 if all the requested data were successfully read; | |
104 | * o %UBI_IO_BITFLIPS if all the requested data were successfully read, but | |
105 | * correctable bit-flips were detected; this is harmless but may indicate | |
106 | * that this eraseblock may become bad soon (but do not have to); | |
63b6c1ed AB |
107 | * o %-EBADMSG if the MTD subsystem reported about data integrity problems, for |
108 | * example it can be an ECC error in case of NAND; this most probably means | |
109 | * that the data is corrupted; | |
801c135c AB |
110 | * o %-EIO if some I/O error occurred; |
111 | * o other negative error codes in case of other errors. | |
112 | */ | |
113 | int ubi_io_read(const struct ubi_device *ubi, void *buf, int pnum, int offset, | |
114 | int len) | |
115 | { | |
116 | int err, retries = 0; | |
117 | size_t read; | |
118 | loff_t addr; | |
119 | ||
120 | dbg_io("read %d bytes from PEB %d:%d", len, pnum, offset); | |
121 | ||
122 | ubi_assert(pnum >= 0 && pnum < ubi->peb_count); | |
123 | ubi_assert(offset >= 0 && offset + len <= ubi->peb_size); | |
124 | ubi_assert(len > 0); | |
125 | ||
8056eb4a | 126 | err = self_check_not_bad(ubi, pnum); |
801c135c | 127 | if (err) |
adbf05e3 | 128 | return err; |
801c135c | 129 | |
276832d8 AB |
130 | /* |
131 | * Deliberately corrupt the buffer to improve robustness. Indeed, if we | |
132 | * do not do this, the following may happen: | |
133 | * 1. The buffer contains data from previous operation, e.g., read from | |
134 | * another PEB previously. The data looks like expected, e.g., if we | |
135 | * just do not read anything and return - the caller would not | |
136 | * notice this. E.g., if we are reading a VID header, the buffer may | |
137 | * contain a valid VID header from another PEB. | |
138 | * 2. The driver is buggy and returns us success or -EBADMSG or | |
139 | * -EUCLEAN, but it does not actually put any data to the buffer. | |
140 | * | |
141 | * This may confuse UBI or upper layers - they may think the buffer | |
142 | * contains valid data while in fact it is just old data. This is | |
143 | * especially possible because UBI (and UBIFS) relies on CRC, and | |
144 | * treats data as correct even in case of ECC errors if the CRC is | |
145 | * correct. | |
146 | * | |
147 | * Try to prevent this situation by changing the first byte of the | |
148 | * buffer. | |
149 | */ | |
150 | *((uint8_t *)buf) ^= 0xFF; | |
151 | ||
801c135c AB |
152 | addr = (loff_t)pnum * ubi->peb_size + offset; |
153 | retry: | |
329ad399 | 154 | err = mtd_read(ubi->mtd, addr, len, &read, buf); |
801c135c | 155 | if (err) { |
d57f4054 | 156 | const char *errstr = mtd_is_eccerr(err) ? " (ECC error)" : ""; |
1a49af2c | 157 | |
d57f4054 | 158 | if (mtd_is_bitflip(err)) { |
801c135c AB |
159 | /* |
160 | * -EUCLEAN is reported if there was a bit-flip which | |
161 | * was corrected, so this is harmless. | |
8c1e6ee1 AB |
162 | * |
163 | * We do not report about it here unless debugging is | |
164 | * enabled. A corresponding message will be printed | |
165 | * later, when it is has been scrubbed. | |
801c135c | 166 | */ |
32608703 TB |
167 | ubi_msg(ubi, "fixable bit-flip detected at PEB %d", |
168 | pnum); | |
801c135c AB |
169 | ubi_assert(len == read); |
170 | return UBI_IO_BITFLIPS; | |
171 | } | |
172 | ||
a87f29cb | 173 | if (retries++ < UBI_IO_RETRIES) { |
32608703 | 174 | ubi_warn(ubi, "error %d%s while reading %d bytes from PEB %d:%d, read only %zd bytes, retry", |
f01e2d16 | 175 | err, errstr, len, pnum, offset, read); |
801c135c AB |
176 | yield(); |
177 | goto retry; | |
178 | } | |
179 | ||
32608703 | 180 | ubi_err(ubi, "error %d%s while reading %d bytes from PEB %d:%d, read %zd bytes", |
049333ce | 181 | err, errstr, len, pnum, offset, read); |
25886a36 | 182 | dump_stack(); |
2362a53e AB |
183 | |
184 | /* | |
185 | * The driver should never return -EBADMSG if it failed to read | |
186 | * all the requested data. But some buggy drivers might do | |
187 | * this, so we change it to -EIO. | |
188 | */ | |
d57f4054 | 189 | if (read != len && mtd_is_eccerr(err)) { |
2362a53e AB |
190 | ubi_assert(0); |
191 | err = -EIO; | |
192 | } | |
801c135c AB |
193 | } else { |
194 | ubi_assert(len == read); | |
195 | ||
27a0f2a3 | 196 | if (ubi_dbg_is_bitflip(ubi)) { |
c8566350 | 197 | dbg_gen("bit-flip (emulated)"); |
801c135c AB |
198 | err = UBI_IO_BITFLIPS; |
199 | } | |
200 | } | |
201 | ||
202 | return err; | |
203 | } | |
204 | ||
205 | /** | |
206 | * ubi_io_write - write data to a physical eraseblock. | |
207 | * @ubi: UBI device description object | |
208 | * @buf: buffer with the data to write | |
209 | * @pnum: physical eraseblock number to write to | |
210 | * @offset: offset within the physical eraseblock where to write | |
211 | * @len: how many bytes to write | |
212 | * | |
213 | * This function writes @len bytes of data from buffer @buf to offset @offset | |
214 | * of physical eraseblock @pnum. If all the data were successfully written, | |
215 | * zero is returned. If an error occurred, this function returns a negative | |
216 | * error code. If %-EIO is returned, the physical eraseblock most probably went | |
217 | * bad. | |
218 | * | |
219 | * Note, in case of an error, it is possible that something was still written | |
220 | * to the flash media, but may be some garbage. | |
221 | */ | |
e88d6e10 AB |
222 | int ubi_io_write(struct ubi_device *ubi, const void *buf, int pnum, int offset, |
223 | int len) | |
801c135c AB |
224 | { |
225 | int err; | |
226 | size_t written; | |
227 | loff_t addr; | |
228 | ||
229 | dbg_io("write %d bytes to PEB %d:%d", len, pnum, offset); | |
230 | ||
231 | ubi_assert(pnum >= 0 && pnum < ubi->peb_count); | |
232 | ubi_assert(offset >= 0 && offset + len <= ubi->peb_size); | |
233 | ubi_assert(offset % ubi->hdrs_min_io_size == 0); | |
234 | ubi_assert(len > 0 && len % ubi->hdrs_min_io_size == 0); | |
235 | ||
236 | if (ubi->ro_mode) { | |
32608703 | 237 | ubi_err(ubi, "read-only mode"); |
801c135c AB |
238 | return -EROFS; |
239 | } | |
240 | ||
8056eb4a | 241 | err = self_check_not_bad(ubi, pnum); |
801c135c | 242 | if (err) |
adbf05e3 | 243 | return err; |
801c135c AB |
244 | |
245 | /* The area we are writing to has to contain all 0xFF bytes */ | |
97d6104b | 246 | err = ubi_self_check_all_ff(ubi, pnum, offset, len); |
801c135c | 247 | if (err) |
adbf05e3 | 248 | return err; |
801c135c AB |
249 | |
250 | if (offset >= ubi->leb_start) { | |
251 | /* | |
252 | * We write to the data area of the physical eraseblock. Make | |
253 | * sure it has valid EC and VID headers. | |
254 | */ | |
8056eb4a | 255 | err = self_check_peb_ec_hdr(ubi, pnum); |
801c135c | 256 | if (err) |
adbf05e3 | 257 | return err; |
8056eb4a | 258 | err = self_check_peb_vid_hdr(ubi, pnum); |
801c135c | 259 | if (err) |
adbf05e3 | 260 | return err; |
801c135c AB |
261 | } |
262 | ||
27a0f2a3 | 263 | if (ubi_dbg_is_write_failure(ubi)) { |
32608703 | 264 | ubi_err(ubi, "cannot write %d bytes to PEB %d:%d (emulated)", |
049333ce | 265 | len, pnum, offset); |
25886a36 | 266 | dump_stack(); |
801c135c AB |
267 | return -EIO; |
268 | } | |
269 | ||
270 | addr = (loff_t)pnum * ubi->peb_size + offset; | |
eda95cbf | 271 | err = mtd_write(ubi->mtd, addr, len, &written, buf); |
801c135c | 272 | if (err) { |
32608703 | 273 | ubi_err(ubi, "error %d while writing %d bytes to PEB %d:%d, written %zd bytes", |
049333ce | 274 | err, len, pnum, offset, written); |
25886a36 | 275 | dump_stack(); |
ef7088e7 | 276 | ubi_dump_flash(ubi, pnum, offset, len); |
801c135c AB |
277 | } else |
278 | ubi_assert(written == len); | |
279 | ||
6e9065d7 | 280 | if (!err) { |
97d6104b | 281 | err = self_check_write(ubi, buf, pnum, offset, len); |
6e9065d7 AB |
282 | if (err) |
283 | return err; | |
284 | ||
285 | /* | |
286 | * Since we always write sequentially, the rest of the PEB has | |
287 | * to contain only 0xFF bytes. | |
288 | */ | |
289 | offset += len; | |
290 | len = ubi->peb_size - offset; | |
291 | if (len) | |
97d6104b | 292 | err = ubi_self_check_all_ff(ubi, pnum, offset, len); |
6e9065d7 AB |
293 | } |
294 | ||
801c135c AB |
295 | return err; |
296 | } | |
297 | ||
801c135c AB |
298 | /** |
299 | * do_sync_erase - synchronously erase a physical eraseblock. | |
300 | * @ubi: UBI device description object | |
301 | * @pnum: the physical eraseblock number to erase | |
302 | * | |
303 | * This function synchronously erases physical eraseblock @pnum and returns | |
304 | * zero in case of success and a negative error code in case of failure. If | |
305 | * %-EIO is returned, the physical eraseblock most probably went bad. | |
306 | */ | |
e88d6e10 | 307 | static int do_sync_erase(struct ubi_device *ubi, int pnum) |
801c135c AB |
308 | { |
309 | int err, retries = 0; | |
310 | struct erase_info ei; | |
801c135c AB |
311 | |
312 | dbg_io("erase PEB %d", pnum); | |
3efe5090 AB |
313 | ubi_assert(pnum >= 0 && pnum < ubi->peb_count); |
314 | ||
315 | if (ubi->ro_mode) { | |
32608703 | 316 | ubi_err(ubi, "read-only mode"); |
3efe5090 AB |
317 | return -EROFS; |
318 | } | |
801c135c AB |
319 | |
320 | retry: | |
801c135c AB |
321 | memset(&ei, 0, sizeof(struct erase_info)); |
322 | ||
2f176f79 | 323 | ei.addr = (loff_t)pnum * ubi->peb_size; |
801c135c | 324 | ei.len = ubi->peb_size; |
801c135c | 325 | |
7e1f0dc0 | 326 | err = mtd_erase(ubi->mtd, &ei); |
801c135c AB |
327 | if (err) { |
328 | if (retries++ < UBI_IO_RETRIES) { | |
32608703 | 329 | ubi_warn(ubi, "error %d while erasing PEB %d, retry", |
f01e2d16 | 330 | err, pnum); |
801c135c AB |
331 | yield(); |
332 | goto retry; | |
333 | } | |
32608703 | 334 | ubi_err(ubi, "cannot erase PEB %d, error %d", pnum, err); |
25886a36 | 335 | dump_stack(); |
801c135c AB |
336 | return err; |
337 | } | |
338 | ||
97d6104b | 339 | err = ubi_self_check_all_ff(ubi, pnum, 0, ubi->peb_size); |
801c135c | 340 | if (err) |
adbf05e3 | 341 | return err; |
801c135c | 342 | |
27a0f2a3 | 343 | if (ubi_dbg_is_erase_failure(ubi)) { |
32608703 | 344 | ubi_err(ubi, "cannot erase PEB %d (emulated)", pnum); |
801c135c AB |
345 | return -EIO; |
346 | } | |
347 | ||
348 | return 0; | |
349 | } | |
350 | ||
801c135c AB |
351 | /* Patterns to write to a physical eraseblock when torturing it */ |
352 | static uint8_t patterns[] = {0xa5, 0x5a, 0x0}; | |
353 | ||
354 | /** | |
355 | * torture_peb - test a supposedly bad physical eraseblock. | |
356 | * @ubi: UBI device description object | |
357 | * @pnum: the physical eraseblock number to test | |
358 | * | |
359 | * This function returns %-EIO if the physical eraseblock did not pass the | |
360 | * test, a positive number of erase operations done if the test was | |
361 | * successfully passed, and other negative error codes in case of other errors. | |
362 | */ | |
e88d6e10 | 363 | static int torture_peb(struct ubi_device *ubi, int pnum) |
801c135c | 364 | { |
801c135c AB |
365 | int err, i, patt_count; |
366 | ||
32608703 | 367 | ubi_msg(ubi, "run torture test for PEB %d", pnum); |
801c135c AB |
368 | patt_count = ARRAY_SIZE(patterns); |
369 | ubi_assert(patt_count > 0); | |
370 | ||
e88d6e10 | 371 | mutex_lock(&ubi->buf_mutex); |
801c135c AB |
372 | for (i = 0; i < patt_count; i++) { |
373 | err = do_sync_erase(ubi, pnum); | |
374 | if (err) | |
375 | goto out; | |
376 | ||
377 | /* Make sure the PEB contains only 0xFF bytes */ | |
0ca39d74 | 378 | err = ubi_io_read(ubi, ubi->peb_buf, pnum, 0, ubi->peb_size); |
801c135c AB |
379 | if (err) |
380 | goto out; | |
381 | ||
0ca39d74 | 382 | err = ubi_check_pattern(ubi->peb_buf, 0xFF, ubi->peb_size); |
801c135c | 383 | if (err == 0) { |
32608703 | 384 | ubi_err(ubi, "erased PEB %d, but a non-0xFF byte found", |
801c135c AB |
385 | pnum); |
386 | err = -EIO; | |
387 | goto out; | |
388 | } | |
389 | ||
390 | /* Write a pattern and check it */ | |
0ca39d74 AB |
391 | memset(ubi->peb_buf, patterns[i], ubi->peb_size); |
392 | err = ubi_io_write(ubi, ubi->peb_buf, pnum, 0, ubi->peb_size); | |
801c135c AB |
393 | if (err) |
394 | goto out; | |
395 | ||
0ca39d74 AB |
396 | memset(ubi->peb_buf, ~patterns[i], ubi->peb_size); |
397 | err = ubi_io_read(ubi, ubi->peb_buf, pnum, 0, ubi->peb_size); | |
801c135c AB |
398 | if (err) |
399 | goto out; | |
400 | ||
0ca39d74 | 401 | err = ubi_check_pattern(ubi->peb_buf, patterns[i], |
bb00e180 | 402 | ubi->peb_size); |
801c135c | 403 | if (err == 0) { |
32608703 | 404 | ubi_err(ubi, "pattern %x checking failed for PEB %d", |
801c135c AB |
405 | patterns[i], pnum); |
406 | err = -EIO; | |
407 | goto out; | |
408 | } | |
409 | } | |
410 | ||
411 | err = patt_count; | |
32608703 | 412 | ubi_msg(ubi, "PEB %d passed torture test, do not mark it as bad", pnum); |
801c135c AB |
413 | |
414 | out: | |
e88d6e10 | 415 | mutex_unlock(&ubi->buf_mutex); |
d57f4054 | 416 | if (err == UBI_IO_BITFLIPS || mtd_is_eccerr(err)) { |
801c135c AB |
417 | /* |
418 | * If a bit-flip or data integrity error was detected, the test | |
419 | * has not passed because it happened on a freshly erased | |
420 | * physical eraseblock which means something is wrong with it. | |
421 | */ | |
32608703 | 422 | ubi_err(ubi, "read problems on freshly erased PEB %d, must be bad", |
8d2d4011 | 423 | pnum); |
801c135c | 424 | err = -EIO; |
8d2d4011 | 425 | } |
801c135c AB |
426 | return err; |
427 | } | |
428 | ||
ebf53f42 AB |
429 | /** |
430 | * nor_erase_prepare - prepare a NOR flash PEB for erasure. | |
431 | * @ubi: UBI device description object | |
432 | * @pnum: physical eraseblock number to prepare | |
433 | * | |
434 | * NOR flash, or at least some of them, have peculiar embedded PEB erasure | |
435 | * algorithm: the PEB is first filled with zeroes, then it is erased. And | |
436 | * filling with zeroes starts from the end of the PEB. This was observed with | |
437 | * Spansion S29GL512N NOR flash. | |
438 | * | |
439 | * This means that in case of a power cut we may end up with intact data at the | |
440 | * beginning of the PEB, and all zeroes at the end of PEB. In other words, the | |
441 | * EC and VID headers are OK, but a large chunk of data at the end of PEB is | |
442 | * zeroed. This makes UBI mistakenly treat this PEB as used and associate it | |
443 | * with an LEB, which leads to subsequent failures (e.g., UBIFS fails). | |
444 | * | |
445 | * This function is called before erasing NOR PEBs and it zeroes out EC and VID | |
446 | * magic numbers in order to invalidate them and prevent the failures. Returns | |
447 | * zero in case of success and a negative error code in case of failure. | |
448 | */ | |
449 | static int nor_erase_prepare(struct ubi_device *ubi, int pnum) | |
450 | { | |
2c7ca5cc | 451 | int err; |
ebf53f42 AB |
452 | size_t written; |
453 | loff_t addr; | |
454 | uint32_t data = 0; | |
2c7ca5cc | 455 | struct ubi_ec_hdr ec_hdr; |
3291b52f | 456 | struct ubi_vid_io_buf vidb; |
2c7ca5cc | 457 | |
2fff570e AB |
458 | /* |
459 | * Note, we cannot generally define VID header buffers on stack, | |
460 | * because of the way we deal with these buffers (see the header | |
461 | * comment in this file). But we know this is a NOR-specific piece of | |
462 | * code, so we can do this. But yes, this is error-prone and we should | |
463 | * (pre-)allocate VID header buffer instead. | |
464 | */ | |
de75c771 | 465 | struct ubi_vid_hdr vid_hdr; |
ebf53f42 | 466 | |
7ac760c2 | 467 | /* |
2c7ca5cc | 468 | * If VID or EC is valid, we have to corrupt them before erasing. |
7ac760c2 AB |
469 | * It is important to first invalidate the EC header, and then the VID |
470 | * header. Otherwise a power cut may lead to valid EC header and | |
471 | * invalid VID header, in which case UBI will treat this PEB as | |
fbd0107f | 472 | * corrupted and will try to preserve it, and print scary warnings. |
7ac760c2 AB |
473 | */ |
474 | addr = (loff_t)pnum * ubi->peb_size; | |
2c7ca5cc QW |
475 | err = ubi_io_read_ec_hdr(ubi, pnum, &ec_hdr, 0); |
476 | if (err != UBI_IO_BAD_HDR_EBADMSG && err != UBI_IO_BAD_HDR && | |
477 | err != UBI_IO_FF){ | |
eda95cbf | 478 | err = mtd_write(ubi->mtd, addr, 4, &written, (void *)&data); |
2c7ca5cc QW |
479 | if(err) |
480 | goto error; | |
ebf53f42 AB |
481 | } |
482 | ||
3291b52f BB |
483 | ubi_init_vid_buf(ubi, &vidb, &vid_hdr); |
484 | ubi_assert(&vid_hdr == ubi_get_vid_hdr(&vidb)); | |
485 | ||
486 | err = ubi_io_read_vid_hdr(ubi, pnum, &vidb, 0); | |
2c7ca5cc QW |
487 | if (err != UBI_IO_BAD_HDR_EBADMSG && err != UBI_IO_BAD_HDR && |
488 | err != UBI_IO_FF){ | |
489 | addr += ubi->vid_hdr_aloffset; | |
490 | err = mtd_write(ubi->mtd, addr, 4, &written, (void *)&data); | |
491 | if (err) | |
492 | goto error; | |
7ac760c2 | 493 | } |
2c7ca5cc | 494 | return 0; |
de75c771 | 495 | |
2c7ca5cc | 496 | error: |
de75c771 | 497 | /* |
2c7ca5cc QW |
498 | * The PEB contains a valid VID or EC header, but we cannot invalidate |
499 | * it. Supposedly the flash media or the driver is screwed up, so | |
500 | * return an error. | |
de75c771 | 501 | */ |
32608703 | 502 | ubi_err(ubi, "cannot invalidate PEB %d, write returned %d", pnum, err); |
ef7088e7 | 503 | ubi_dump_flash(ubi, pnum, 0, ubi->peb_size); |
de75c771 | 504 | return -EIO; |
ebf53f42 AB |
505 | } |
506 | ||
801c135c AB |
507 | /** |
508 | * ubi_io_sync_erase - synchronously erase a physical eraseblock. | |
509 | * @ubi: UBI device description object | |
510 | * @pnum: physical eraseblock number to erase | |
511 | * @torture: if this physical eraseblock has to be tortured | |
512 | * | |
513 | * This function synchronously erases physical eraseblock @pnum. If @torture | |
514 | * flag is not zero, the physical eraseblock is checked by means of writing | |
515 | * different patterns to it and reading them back. If the torturing is enabled, | |
025dfdaf | 516 | * the physical eraseblock is erased more than once. |
801c135c AB |
517 | * |
518 | * This function returns the number of erasures made in case of success, %-EIO | |
519 | * if the erasure failed or the torturing test failed, and other negative error | |
520 | * codes in case of other errors. Note, %-EIO means that the physical | |
521 | * eraseblock is bad. | |
522 | */ | |
e88d6e10 | 523 | int ubi_io_sync_erase(struct ubi_device *ubi, int pnum, int torture) |
801c135c AB |
524 | { |
525 | int err, ret = 0; | |
526 | ||
527 | ubi_assert(pnum >= 0 && pnum < ubi->peb_count); | |
528 | ||
8056eb4a | 529 | err = self_check_not_bad(ubi, pnum); |
801c135c | 530 | if (err != 0) |
adbf05e3 | 531 | return err; |
801c135c AB |
532 | |
533 | if (ubi->ro_mode) { | |
32608703 | 534 | ubi_err(ubi, "read-only mode"); |
801c135c AB |
535 | return -EROFS; |
536 | } | |
537 | ||
ebf53f42 AB |
538 | if (ubi->nor_flash) { |
539 | err = nor_erase_prepare(ubi, pnum); | |
540 | if (err) | |
541 | return err; | |
542 | } | |
543 | ||
801c135c AB |
544 | if (torture) { |
545 | ret = torture_peb(ubi, pnum); | |
546 | if (ret < 0) | |
547 | return ret; | |
548 | } | |
549 | ||
550 | err = do_sync_erase(ubi, pnum); | |
551 | if (err) | |
552 | return err; | |
553 | ||
554 | return ret + 1; | |
555 | } | |
556 | ||
557 | /** | |
558 | * ubi_io_is_bad - check if a physical eraseblock is bad. | |
559 | * @ubi: UBI device description object | |
560 | * @pnum: the physical eraseblock number to check | |
561 | * | |
562 | * This function returns a positive number if the physical eraseblock is bad, | |
563 | * zero if not, and a negative error code if an error occurred. | |
564 | */ | |
565 | int ubi_io_is_bad(const struct ubi_device *ubi, int pnum) | |
566 | { | |
567 | struct mtd_info *mtd = ubi->mtd; | |
568 | ||
569 | ubi_assert(pnum >= 0 && pnum < ubi->peb_count); | |
570 | ||
571 | if (ubi->bad_allowed) { | |
572 | int ret; | |
573 | ||
7086c19d | 574 | ret = mtd_block_isbad(mtd, (loff_t)pnum * ubi->peb_size); |
801c135c | 575 | if (ret < 0) |
32608703 | 576 | ubi_err(ubi, "error %d while checking if PEB %d is bad", |
801c135c AB |
577 | ret, pnum); |
578 | else if (ret) | |
579 | dbg_io("PEB %d is bad", pnum); | |
580 | return ret; | |
581 | } | |
582 | ||
583 | return 0; | |
584 | } | |
585 | ||
586 | /** | |
587 | * ubi_io_mark_bad - mark a physical eraseblock as bad. | |
588 | * @ubi: UBI device description object | |
589 | * @pnum: the physical eraseblock number to mark | |
590 | * | |
591 | * This function returns zero in case of success and a negative error code in | |
592 | * case of failure. | |
593 | */ | |
594 | int ubi_io_mark_bad(const struct ubi_device *ubi, int pnum) | |
595 | { | |
596 | int err; | |
597 | struct mtd_info *mtd = ubi->mtd; | |
598 | ||
599 | ubi_assert(pnum >= 0 && pnum < ubi->peb_count); | |
600 | ||
601 | if (ubi->ro_mode) { | |
32608703 | 602 | ubi_err(ubi, "read-only mode"); |
801c135c AB |
603 | return -EROFS; |
604 | } | |
605 | ||
606 | if (!ubi->bad_allowed) | |
607 | return 0; | |
608 | ||
5942ddbc | 609 | err = mtd_block_markbad(mtd, (loff_t)pnum * ubi->peb_size); |
801c135c | 610 | if (err) |
32608703 | 611 | ubi_err(ubi, "cannot mark PEB %d bad, error %d", pnum, err); |
801c135c AB |
612 | return err; |
613 | } | |
614 | ||
615 | /** | |
616 | * validate_ec_hdr - validate an erase counter header. | |
617 | * @ubi: UBI device description object | |
618 | * @ec_hdr: the erase counter header to check | |
619 | * | |
620 | * This function returns zero if the erase counter header is OK, and %1 if | |
621 | * not. | |
622 | */ | |
fe96efc1 | 623 | static int validate_ec_hdr(const struct ubi_device *ubi, |
801c135c AB |
624 | const struct ubi_ec_hdr *ec_hdr) |
625 | { | |
626 | long long ec; | |
fe96efc1 | 627 | int vid_hdr_offset, leb_start; |
801c135c | 628 | |
3261ebd7 CH |
629 | ec = be64_to_cpu(ec_hdr->ec); |
630 | vid_hdr_offset = be32_to_cpu(ec_hdr->vid_hdr_offset); | |
631 | leb_start = be32_to_cpu(ec_hdr->data_offset); | |
801c135c AB |
632 | |
633 | if (ec_hdr->version != UBI_VERSION) { | |
32608703 | 634 | ubi_err(ubi, "node with incompatible UBI version found: this UBI version is %d, image version is %d", |
801c135c AB |
635 | UBI_VERSION, (int)ec_hdr->version); |
636 | goto bad; | |
637 | } | |
638 | ||
639 | if (vid_hdr_offset != ubi->vid_hdr_offset) { | |
32608703 | 640 | ubi_err(ubi, "bad VID header offset %d, expected %d", |
801c135c AB |
641 | vid_hdr_offset, ubi->vid_hdr_offset); |
642 | goto bad; | |
643 | } | |
644 | ||
645 | if (leb_start != ubi->leb_start) { | |
32608703 | 646 | ubi_err(ubi, "bad data offset %d, expected %d", |
801c135c AB |
647 | leb_start, ubi->leb_start); |
648 | goto bad; | |
649 | } | |
650 | ||
651 | if (ec < 0 || ec > UBI_MAX_ERASECOUNTER) { | |
32608703 | 652 | ubi_err(ubi, "bad erase counter %lld", ec); |
801c135c AB |
653 | goto bad; |
654 | } | |
655 | ||
656 | return 0; | |
657 | ||
658 | bad: | |
32608703 | 659 | ubi_err(ubi, "bad EC header"); |
a904e3f1 | 660 | ubi_dump_ec_hdr(ec_hdr); |
25886a36 | 661 | dump_stack(); |
801c135c AB |
662 | return 1; |
663 | } | |
664 | ||
665 | /** | |
666 | * ubi_io_read_ec_hdr - read and check an erase counter header. | |
667 | * @ubi: UBI device description object | |
668 | * @pnum: physical eraseblock to read from | |
669 | * @ec_hdr: a &struct ubi_ec_hdr object where to store the read erase counter | |
670 | * header | |
671 | * @verbose: be verbose if the header is corrupted or was not found | |
672 | * | |
673 | * This function reads erase counter header from physical eraseblock @pnum and | |
674 | * stores it in @ec_hdr. This function also checks CRC checksum of the read | |
675 | * erase counter header. The following codes may be returned: | |
676 | * | |
677 | * o %0 if the CRC checksum is correct and the header was successfully read; | |
678 | * o %UBI_IO_BITFLIPS if the CRC is correct, but bit-flips were detected | |
679 | * and corrected by the flash driver; this is harmless but may indicate that | |
680 | * this eraseblock may become bad soon (but may be not); | |
786d7831 | 681 | * o %UBI_IO_BAD_HDR if the erase counter header is corrupted (a CRC error); |
756e1df1 AB |
682 | * o %UBI_IO_BAD_HDR_EBADMSG is the same as %UBI_IO_BAD_HDR, but there also was |
683 | * a data integrity error (uncorrectable ECC error in case of NAND); | |
74d82d26 | 684 | * o %UBI_IO_FF if only 0xFF bytes were read (the PEB is supposedly empty) |
801c135c AB |
685 | * o a negative error code in case of failure. |
686 | */ | |
e88d6e10 | 687 | int ubi_io_read_ec_hdr(struct ubi_device *ubi, int pnum, |
801c135c AB |
688 | struct ubi_ec_hdr *ec_hdr, int verbose) |
689 | { | |
92e1a7d9 | 690 | int err, read_err; |
801c135c AB |
691 | uint32_t crc, magic, hdr_crc; |
692 | ||
693 | dbg_io("read EC header from PEB %d", pnum); | |
694 | ubi_assert(pnum >= 0 && pnum < ubi->peb_count); | |
695 | ||
92e1a7d9 AB |
696 | read_err = ubi_io_read(ubi, ec_hdr, pnum, 0, UBI_EC_HDR_SIZE); |
697 | if (read_err) { | |
d57f4054 | 698 | if (read_err != UBI_IO_BITFLIPS && !mtd_is_eccerr(read_err)) |
92e1a7d9 | 699 | return read_err; |
801c135c AB |
700 | |
701 | /* | |
702 | * We read all the data, but either a correctable bit-flip | |
756e1df1 AB |
703 | * occurred, or MTD reported a data integrity error |
704 | * (uncorrectable ECC error in case of NAND). The former is | |
705 | * harmless, the later may mean that the read data is | |
706 | * corrupted. But we have a CRC check-sum and we will detect | |
707 | * this. If the EC header is still OK, we just report this as | |
708 | * there was a bit-flip, to force scrubbing. | |
801c135c | 709 | */ |
801c135c AB |
710 | } |
711 | ||
3261ebd7 | 712 | magic = be32_to_cpu(ec_hdr->magic); |
801c135c | 713 | if (magic != UBI_EC_HDR_MAGIC) { |
d57f4054 | 714 | if (mtd_is_eccerr(read_err)) |
92e1a7d9 | 715 | return UBI_IO_BAD_HDR_EBADMSG; |
eb89580e | 716 | |
801c135c AB |
717 | /* |
718 | * The magic field is wrong. Let's check if we have read all | |
719 | * 0xFF. If yes, this physical eraseblock is assumed to be | |
720 | * empty. | |
801c135c | 721 | */ |
bb00e180 | 722 | if (ubi_check_pattern(ec_hdr, 0xFF, UBI_EC_HDR_SIZE)) { |
801c135c | 723 | /* The physical eraseblock is supposedly empty */ |
801c135c | 724 | if (verbose) |
32608703 | 725 | ubi_warn(ubi, "no EC header found at PEB %d, only 0xFF bytes", |
049333ce AB |
726 | pnum); |
727 | dbg_bld("no EC header found at PEB %d, only 0xFF bytes", | |
728 | pnum); | |
92e1a7d9 AB |
729 | if (!read_err) |
730 | return UBI_IO_FF; | |
731 | else | |
732 | return UBI_IO_FF_BITFLIPS; | |
801c135c AB |
733 | } |
734 | ||
735 | /* | |
736 | * This is not a valid erase counter header, and these are not | |
737 | * 0xFF bytes. Report that the header is corrupted. | |
738 | */ | |
739 | if (verbose) { | |
32608703 | 740 | ubi_warn(ubi, "bad magic number at PEB %d: %08x instead of %08x", |
049333ce | 741 | pnum, magic, UBI_EC_HDR_MAGIC); |
a904e3f1 | 742 | ubi_dump_ec_hdr(ec_hdr); |
6f9fdf62 | 743 | } |
049333ce AB |
744 | dbg_bld("bad magic number at PEB %d: %08x instead of %08x", |
745 | pnum, magic, UBI_EC_HDR_MAGIC); | |
786d7831 | 746 | return UBI_IO_BAD_HDR; |
801c135c AB |
747 | } |
748 | ||
749 | crc = crc32(UBI_CRC32_INIT, ec_hdr, UBI_EC_HDR_SIZE_CRC); | |
3261ebd7 | 750 | hdr_crc = be32_to_cpu(ec_hdr->hdr_crc); |
801c135c AB |
751 | |
752 | if (hdr_crc != crc) { | |
753 | if (verbose) { | |
32608703 | 754 | ubi_warn(ubi, "bad EC header CRC at PEB %d, calculated %#08x, read %#08x", |
049333ce | 755 | pnum, crc, hdr_crc); |
a904e3f1 | 756 | ubi_dump_ec_hdr(ec_hdr); |
6f9fdf62 | 757 | } |
049333ce AB |
758 | dbg_bld("bad EC header CRC at PEB %d, calculated %#08x, read %#08x", |
759 | pnum, crc, hdr_crc); | |
92e1a7d9 AB |
760 | |
761 | if (!read_err) | |
762 | return UBI_IO_BAD_HDR; | |
763 | else | |
764 | return UBI_IO_BAD_HDR_EBADMSG; | |
801c135c AB |
765 | } |
766 | ||
767 | /* And of course validate what has just been read from the media */ | |
768 | err = validate_ec_hdr(ubi, ec_hdr); | |
769 | if (err) { | |
32608703 | 770 | ubi_err(ubi, "validation failed for PEB %d", pnum); |
801c135c AB |
771 | return -EINVAL; |
772 | } | |
773 | ||
eb89580e AB |
774 | /* |
775 | * If there was %-EBADMSG, but the header CRC is still OK, report about | |
776 | * a bit-flip to force scrubbing on this PEB. | |
777 | */ | |
801c135c AB |
778 | return read_err ? UBI_IO_BITFLIPS : 0; |
779 | } | |
780 | ||
781 | /** | |
782 | * ubi_io_write_ec_hdr - write an erase counter header. | |
783 | * @ubi: UBI device description object | |
784 | * @pnum: physical eraseblock to write to | |
785 | * @ec_hdr: the erase counter header to write | |
786 | * | |
787 | * This function writes erase counter header described by @ec_hdr to physical | |
788 | * eraseblock @pnum. It also fills most fields of @ec_hdr before writing, so | |
789 | * the caller do not have to fill them. Callers must only fill the @ec_hdr->ec | |
790 | * field. | |
791 | * | |
792 | * This function returns zero in case of success and a negative error code in | |
793 | * case of failure. If %-EIO is returned, the physical eraseblock most probably | |
794 | * went bad. | |
795 | */ | |
e88d6e10 | 796 | int ubi_io_write_ec_hdr(struct ubi_device *ubi, int pnum, |
801c135c AB |
797 | struct ubi_ec_hdr *ec_hdr) |
798 | { | |
799 | int err; | |
800 | uint32_t crc; | |
801 | ||
802 | dbg_io("write EC header to PEB %d", pnum); | |
803 | ubi_assert(pnum >= 0 && pnum < ubi->peb_count); | |
804 | ||
3261ebd7 | 805 | ec_hdr->magic = cpu_to_be32(UBI_EC_HDR_MAGIC); |
801c135c | 806 | ec_hdr->version = UBI_VERSION; |
3261ebd7 CH |
807 | ec_hdr->vid_hdr_offset = cpu_to_be32(ubi->vid_hdr_offset); |
808 | ec_hdr->data_offset = cpu_to_be32(ubi->leb_start); | |
0c6c7fa1 | 809 | ec_hdr->image_seq = cpu_to_be32(ubi->image_seq); |
801c135c | 810 | crc = crc32(UBI_CRC32_INIT, ec_hdr, UBI_EC_HDR_SIZE_CRC); |
3261ebd7 | 811 | ec_hdr->hdr_crc = cpu_to_be32(crc); |
801c135c | 812 | |
8056eb4a | 813 | err = self_check_ec_hdr(ubi, pnum, ec_hdr); |
801c135c | 814 | if (err) |
adbf05e3 | 815 | return err; |
801c135c | 816 | |
50269067 | 817 | if (ubi_dbg_power_cut(ubi, POWER_CUT_EC_WRITE)) |
818 | return -EROFS; | |
819 | ||
801c135c AB |
820 | err = ubi_io_write(ubi, ec_hdr, pnum, 0, ubi->ec_hdr_alsize); |
821 | return err; | |
822 | } | |
823 | ||
824 | /** | |
825 | * validate_vid_hdr - validate a volume identifier header. | |
826 | * @ubi: UBI device description object | |
827 | * @vid_hdr: the volume identifier header to check | |
828 | * | |
829 | * This function checks that data stored in the volume identifier header | |
830 | * @vid_hdr. Returns zero if the VID header is OK and %1 if not. | |
831 | */ | |
832 | static int validate_vid_hdr(const struct ubi_device *ubi, | |
833 | const struct ubi_vid_hdr *vid_hdr) | |
834 | { | |
835 | int vol_type = vid_hdr->vol_type; | |
836 | int copy_flag = vid_hdr->copy_flag; | |
3261ebd7 CH |
837 | int vol_id = be32_to_cpu(vid_hdr->vol_id); |
838 | int lnum = be32_to_cpu(vid_hdr->lnum); | |
801c135c | 839 | int compat = vid_hdr->compat; |
3261ebd7 CH |
840 | int data_size = be32_to_cpu(vid_hdr->data_size); |
841 | int used_ebs = be32_to_cpu(vid_hdr->used_ebs); | |
842 | int data_pad = be32_to_cpu(vid_hdr->data_pad); | |
843 | int data_crc = be32_to_cpu(vid_hdr->data_crc); | |
801c135c AB |
844 | int usable_leb_size = ubi->leb_size - data_pad; |
845 | ||
846 | if (copy_flag != 0 && copy_flag != 1) { | |
32608703 | 847 | ubi_err(ubi, "bad copy_flag"); |
801c135c AB |
848 | goto bad; |
849 | } | |
850 | ||
851 | if (vol_id < 0 || lnum < 0 || data_size < 0 || used_ebs < 0 || | |
852 | data_pad < 0) { | |
32608703 | 853 | ubi_err(ubi, "negative values"); |
801c135c AB |
854 | goto bad; |
855 | } | |
856 | ||
857 | if (vol_id >= UBI_MAX_VOLUMES && vol_id < UBI_INTERNAL_VOL_START) { | |
32608703 | 858 | ubi_err(ubi, "bad vol_id"); |
801c135c AB |
859 | goto bad; |
860 | } | |
861 | ||
862 | if (vol_id < UBI_INTERNAL_VOL_START && compat != 0) { | |
32608703 | 863 | ubi_err(ubi, "bad compat"); |
801c135c AB |
864 | goto bad; |
865 | } | |
866 | ||
867 | if (vol_id >= UBI_INTERNAL_VOL_START && compat != UBI_COMPAT_DELETE && | |
868 | compat != UBI_COMPAT_RO && compat != UBI_COMPAT_PRESERVE && | |
869 | compat != UBI_COMPAT_REJECT) { | |
32608703 | 870 | ubi_err(ubi, "bad compat"); |
801c135c AB |
871 | goto bad; |
872 | } | |
873 | ||
874 | if (vol_type != UBI_VID_DYNAMIC && vol_type != UBI_VID_STATIC) { | |
32608703 | 875 | ubi_err(ubi, "bad vol_type"); |
801c135c AB |
876 | goto bad; |
877 | } | |
878 | ||
879 | if (data_pad >= ubi->leb_size / 2) { | |
32608703 | 880 | ubi_err(ubi, "bad data_pad"); |
801c135c AB |
881 | goto bad; |
882 | } | |
883 | ||
281fda27 RW |
884 | if (data_size > ubi->leb_size) { |
885 | ubi_err(ubi, "bad data_size"); | |
886 | goto bad; | |
887 | } | |
888 | ||
801c135c AB |
889 | if (vol_type == UBI_VID_STATIC) { |
890 | /* | |
891 | * Although from high-level point of view static volumes may | |
892 | * contain zero bytes of data, but no VID headers can contain | |
893 | * zero at these fields, because they empty volumes do not have | |
894 | * mapped logical eraseblocks. | |
895 | */ | |
896 | if (used_ebs == 0) { | |
32608703 | 897 | ubi_err(ubi, "zero used_ebs"); |
801c135c AB |
898 | goto bad; |
899 | } | |
900 | if (data_size == 0) { | |
32608703 | 901 | ubi_err(ubi, "zero data_size"); |
801c135c AB |
902 | goto bad; |
903 | } | |
904 | if (lnum < used_ebs - 1) { | |
905 | if (data_size != usable_leb_size) { | |
32608703 | 906 | ubi_err(ubi, "bad data_size"); |
801c135c AB |
907 | goto bad; |
908 | } | |
909 | } else if (lnum == used_ebs - 1) { | |
910 | if (data_size == 0) { | |
32608703 | 911 | ubi_err(ubi, "bad data_size at last LEB"); |
801c135c AB |
912 | goto bad; |
913 | } | |
914 | } else { | |
32608703 | 915 | ubi_err(ubi, "too high lnum"); |
801c135c AB |
916 | goto bad; |
917 | } | |
918 | } else { | |
919 | if (copy_flag == 0) { | |
920 | if (data_crc != 0) { | |
32608703 | 921 | ubi_err(ubi, "non-zero data CRC"); |
801c135c AB |
922 | goto bad; |
923 | } | |
924 | if (data_size != 0) { | |
32608703 | 925 | ubi_err(ubi, "non-zero data_size"); |
801c135c AB |
926 | goto bad; |
927 | } | |
928 | } else { | |
929 | if (data_size == 0) { | |
32608703 | 930 | ubi_err(ubi, "zero data_size of copy"); |
801c135c AB |
931 | goto bad; |
932 | } | |
933 | } | |
934 | if (used_ebs != 0) { | |
32608703 | 935 | ubi_err(ubi, "bad used_ebs"); |
801c135c AB |
936 | goto bad; |
937 | } | |
938 | } | |
939 | ||
940 | return 0; | |
941 | ||
942 | bad: | |
32608703 | 943 | ubi_err(ubi, "bad VID header"); |
a904e3f1 | 944 | ubi_dump_vid_hdr(vid_hdr); |
25886a36 | 945 | dump_stack(); |
801c135c AB |
946 | return 1; |
947 | } | |
948 | ||
949 | /** | |
950 | * ubi_io_read_vid_hdr - read and check a volume identifier header. | |
951 | * @ubi: UBI device description object | |
952 | * @pnum: physical eraseblock number to read from | |
3291b52f | 953 | * @vidb: the volume identifier buffer to store data in |
801c135c AB |
954 | * @verbose: be verbose if the header is corrupted or wasn't found |
955 | * | |
956 | * This function reads the volume identifier header from physical eraseblock | |
3291b52f | 957 | * @pnum and stores it in @vidb. It also checks CRC checksum of the read |
74d82d26 AB |
958 | * volume identifier header. The error codes are the same as in |
959 | * 'ubi_io_read_ec_hdr()'. | |
801c135c | 960 | * |
74d82d26 AB |
961 | * Note, the implementation of this function is also very similar to |
962 | * 'ubi_io_read_ec_hdr()', so refer commentaries in 'ubi_io_read_ec_hdr()'. | |
801c135c | 963 | */ |
e88d6e10 | 964 | int ubi_io_read_vid_hdr(struct ubi_device *ubi, int pnum, |
3291b52f | 965 | struct ubi_vid_io_buf *vidb, int verbose) |
801c135c | 966 | { |
92e1a7d9 | 967 | int err, read_err; |
801c135c | 968 | uint32_t crc, magic, hdr_crc; |
3291b52f BB |
969 | struct ubi_vid_hdr *vid_hdr = ubi_get_vid_hdr(vidb); |
970 | void *p = vidb->buffer; | |
801c135c AB |
971 | |
972 | dbg_io("read VID header from PEB %d", pnum); | |
973 | ubi_assert(pnum >= 0 && pnum < ubi->peb_count); | |
974 | ||
92e1a7d9 | 975 | read_err = ubi_io_read(ubi, p, pnum, ubi->vid_hdr_aloffset, |
8a8e8d2f | 976 | ubi->vid_hdr_shift + UBI_VID_HDR_SIZE); |
d57f4054 | 977 | if (read_err && read_err != UBI_IO_BITFLIPS && !mtd_is_eccerr(read_err)) |
92e1a7d9 | 978 | return read_err; |
801c135c | 979 | |
3261ebd7 | 980 | magic = be32_to_cpu(vid_hdr->magic); |
801c135c | 981 | if (magic != UBI_VID_HDR_MAGIC) { |
d57f4054 | 982 | if (mtd_is_eccerr(read_err)) |
92e1a7d9 | 983 | return UBI_IO_BAD_HDR_EBADMSG; |
eb89580e | 984 | |
bb00e180 | 985 | if (ubi_check_pattern(vid_hdr, 0xFF, UBI_VID_HDR_SIZE)) { |
801c135c | 986 | if (verbose) |
32608703 | 987 | ubi_warn(ubi, "no VID header found at PEB %d, only 0xFF bytes", |
049333ce AB |
988 | pnum); |
989 | dbg_bld("no VID header found at PEB %d, only 0xFF bytes", | |
990 | pnum); | |
92e1a7d9 AB |
991 | if (!read_err) |
992 | return UBI_IO_FF; | |
993 | else | |
994 | return UBI_IO_FF_BITFLIPS; | |
801c135c AB |
995 | } |
996 | ||
801c135c | 997 | if (verbose) { |
32608703 | 998 | ubi_warn(ubi, "bad magic number at PEB %d: %08x instead of %08x", |
049333ce | 999 | pnum, magic, UBI_VID_HDR_MAGIC); |
a904e3f1 | 1000 | ubi_dump_vid_hdr(vid_hdr); |
6f9fdf62 | 1001 | } |
049333ce AB |
1002 | dbg_bld("bad magic number at PEB %d: %08x instead of %08x", |
1003 | pnum, magic, UBI_VID_HDR_MAGIC); | |
786d7831 | 1004 | return UBI_IO_BAD_HDR; |
801c135c AB |
1005 | } |
1006 | ||
1007 | crc = crc32(UBI_CRC32_INIT, vid_hdr, UBI_VID_HDR_SIZE_CRC); | |
3261ebd7 | 1008 | hdr_crc = be32_to_cpu(vid_hdr->hdr_crc); |
801c135c AB |
1009 | |
1010 | if (hdr_crc != crc) { | |
1011 | if (verbose) { | |
32608703 | 1012 | ubi_warn(ubi, "bad CRC at PEB %d, calculated %#08x, read %#08x", |
049333ce | 1013 | pnum, crc, hdr_crc); |
a904e3f1 | 1014 | ubi_dump_vid_hdr(vid_hdr); |
6f9fdf62 | 1015 | } |
049333ce AB |
1016 | dbg_bld("bad CRC at PEB %d, calculated %#08x, read %#08x", |
1017 | pnum, crc, hdr_crc); | |
92e1a7d9 AB |
1018 | if (!read_err) |
1019 | return UBI_IO_BAD_HDR; | |
1020 | else | |
1021 | return UBI_IO_BAD_HDR_EBADMSG; | |
801c135c AB |
1022 | } |
1023 | ||
801c135c AB |
1024 | err = validate_vid_hdr(ubi, vid_hdr); |
1025 | if (err) { | |
32608703 | 1026 | ubi_err(ubi, "validation failed for PEB %d", pnum); |
801c135c AB |
1027 | return -EINVAL; |
1028 | } | |
1029 | ||
1030 | return read_err ? UBI_IO_BITFLIPS : 0; | |
1031 | } | |
1032 | ||
1033 | /** | |
1034 | * ubi_io_write_vid_hdr - write a volume identifier header. | |
1035 | * @ubi: UBI device description object | |
1036 | * @pnum: the physical eraseblock number to write to | |
3291b52f | 1037 | * @vidb: the volume identifier buffer to write |
801c135c AB |
1038 | * |
1039 | * This function writes the volume identifier header described by @vid_hdr to | |
1040 | * physical eraseblock @pnum. This function automatically fills the | |
3291b52f BB |
1041 | * @vidb->hdr->magic and the @vidb->hdr->version fields, as well as calculates |
1042 | * header CRC checksum and stores it at vidb->hdr->hdr_crc. | |
801c135c AB |
1043 | * |
1044 | * This function returns zero in case of success and a negative error code in | |
1045 | * case of failure. If %-EIO is returned, the physical eraseblock probably went | |
1046 | * bad. | |
1047 | */ | |
e88d6e10 | 1048 | int ubi_io_write_vid_hdr(struct ubi_device *ubi, int pnum, |
3291b52f | 1049 | struct ubi_vid_io_buf *vidb) |
801c135c | 1050 | { |
3291b52f | 1051 | struct ubi_vid_hdr *vid_hdr = ubi_get_vid_hdr(vidb); |
801c135c AB |
1052 | int err; |
1053 | uint32_t crc; | |
3291b52f | 1054 | void *p = vidb->buffer; |
801c135c AB |
1055 | |
1056 | dbg_io("write VID header to PEB %d", pnum); | |
1057 | ubi_assert(pnum >= 0 && pnum < ubi->peb_count); | |
1058 | ||
8056eb4a | 1059 | err = self_check_peb_ec_hdr(ubi, pnum); |
801c135c | 1060 | if (err) |
adbf05e3 | 1061 | return err; |
801c135c | 1062 | |
3261ebd7 | 1063 | vid_hdr->magic = cpu_to_be32(UBI_VID_HDR_MAGIC); |
801c135c AB |
1064 | vid_hdr->version = UBI_VERSION; |
1065 | crc = crc32(UBI_CRC32_INIT, vid_hdr, UBI_VID_HDR_SIZE_CRC); | |
3261ebd7 | 1066 | vid_hdr->hdr_crc = cpu_to_be32(crc); |
801c135c | 1067 | |
8056eb4a | 1068 | err = self_check_vid_hdr(ubi, pnum, vid_hdr); |
801c135c | 1069 | if (err) |
adbf05e3 | 1070 | return err; |
801c135c | 1071 | |
50269067 | 1072 | if (ubi_dbg_power_cut(ubi, POWER_CUT_VID_WRITE)) |
1073 | return -EROFS; | |
1074 | ||
801c135c AB |
1075 | err = ubi_io_write(ubi, p, pnum, ubi->vid_hdr_aloffset, |
1076 | ubi->vid_hdr_alsize); | |
1077 | return err; | |
1078 | } | |
1079 | ||
801c135c | 1080 | /** |
8056eb4a | 1081 | * self_check_not_bad - ensure that a physical eraseblock is not bad. |
801c135c AB |
1082 | * @ubi: UBI device description object |
1083 | * @pnum: physical eraseblock number to check | |
1084 | * | |
adbf05e3 AB |
1085 | * This function returns zero if the physical eraseblock is good, %-EINVAL if |
1086 | * it is bad and a negative error code if an error occurred. | |
801c135c | 1087 | */ |
8056eb4a | 1088 | static int self_check_not_bad(const struct ubi_device *ubi, int pnum) |
801c135c AB |
1089 | { |
1090 | int err; | |
1091 | ||
64575574 | 1092 | if (!ubi_dbg_chk_io(ubi)) |
92d124f5 AB |
1093 | return 0; |
1094 | ||
801c135c AB |
1095 | err = ubi_io_is_bad(ubi, pnum); |
1096 | if (!err) | |
1097 | return err; | |
1098 | ||
32608703 | 1099 | ubi_err(ubi, "self-check failed for PEB %d", pnum); |
25886a36 | 1100 | dump_stack(); |
adbf05e3 | 1101 | return err > 0 ? -EINVAL : err; |
801c135c AB |
1102 | } |
1103 | ||
1104 | /** | |
8056eb4a | 1105 | * self_check_ec_hdr - check if an erase counter header is all right. |
801c135c AB |
1106 | * @ubi: UBI device description object |
1107 | * @pnum: physical eraseblock number the erase counter header belongs to | |
1108 | * @ec_hdr: the erase counter header to check | |
1109 | * | |
1110 | * This function returns zero if the erase counter header contains valid | |
adbf05e3 | 1111 | * values, and %-EINVAL if not. |
801c135c | 1112 | */ |
8056eb4a AB |
1113 | static int self_check_ec_hdr(const struct ubi_device *ubi, int pnum, |
1114 | const struct ubi_ec_hdr *ec_hdr) | |
801c135c AB |
1115 | { |
1116 | int err; | |
1117 | uint32_t magic; | |
1118 | ||
64575574 | 1119 | if (!ubi_dbg_chk_io(ubi)) |
92d124f5 AB |
1120 | return 0; |
1121 | ||
3261ebd7 | 1122 | magic = be32_to_cpu(ec_hdr->magic); |
801c135c | 1123 | if (magic != UBI_EC_HDR_MAGIC) { |
32608703 | 1124 | ubi_err(ubi, "bad magic %#08x, must be %#08x", |
801c135c AB |
1125 | magic, UBI_EC_HDR_MAGIC); |
1126 | goto fail; | |
1127 | } | |
1128 | ||
1129 | err = validate_ec_hdr(ubi, ec_hdr); | |
1130 | if (err) { | |
32608703 | 1131 | ubi_err(ubi, "self-check failed for PEB %d", pnum); |
801c135c AB |
1132 | goto fail; |
1133 | } | |
1134 | ||
1135 | return 0; | |
1136 | ||
1137 | fail: | |
a904e3f1 | 1138 | ubi_dump_ec_hdr(ec_hdr); |
25886a36 | 1139 | dump_stack(); |
adbf05e3 | 1140 | return -EINVAL; |
801c135c AB |
1141 | } |
1142 | ||
1143 | /** | |
8056eb4a | 1144 | * self_check_peb_ec_hdr - check erase counter header. |
801c135c AB |
1145 | * @ubi: UBI device description object |
1146 | * @pnum: the physical eraseblock number to check | |
1147 | * | |
adbf05e3 AB |
1148 | * This function returns zero if the erase counter header is all right and and |
1149 | * a negative error code if not or if an error occurred. | |
801c135c | 1150 | */ |
8056eb4a | 1151 | static int self_check_peb_ec_hdr(const struct ubi_device *ubi, int pnum) |
801c135c AB |
1152 | { |
1153 | int err; | |
1154 | uint32_t crc, hdr_crc; | |
1155 | struct ubi_ec_hdr *ec_hdr; | |
1156 | ||
64575574 | 1157 | if (!ubi_dbg_chk_io(ubi)) |
92d124f5 AB |
1158 | return 0; |
1159 | ||
33818bbb | 1160 | ec_hdr = kzalloc(ubi->ec_hdr_alsize, GFP_NOFS); |
801c135c AB |
1161 | if (!ec_hdr) |
1162 | return -ENOMEM; | |
1163 | ||
1164 | err = ubi_io_read(ubi, ec_hdr, pnum, 0, UBI_EC_HDR_SIZE); | |
d57f4054 | 1165 | if (err && err != UBI_IO_BITFLIPS && !mtd_is_eccerr(err)) |
801c135c AB |
1166 | goto exit; |
1167 | ||
1168 | crc = crc32(UBI_CRC32_INIT, ec_hdr, UBI_EC_HDR_SIZE_CRC); | |
3261ebd7 | 1169 | hdr_crc = be32_to_cpu(ec_hdr->hdr_crc); |
801c135c | 1170 | if (hdr_crc != crc) { |
32608703 TB |
1171 | ubi_err(ubi, "bad CRC, calculated %#08x, read %#08x", |
1172 | crc, hdr_crc); | |
1173 | ubi_err(ubi, "self-check failed for PEB %d", pnum); | |
a904e3f1 | 1174 | ubi_dump_ec_hdr(ec_hdr); |
25886a36 | 1175 | dump_stack(); |
adbf05e3 | 1176 | err = -EINVAL; |
801c135c AB |
1177 | goto exit; |
1178 | } | |
1179 | ||
8056eb4a | 1180 | err = self_check_ec_hdr(ubi, pnum, ec_hdr); |
801c135c AB |
1181 | |
1182 | exit: | |
1183 | kfree(ec_hdr); | |
1184 | return err; | |
1185 | } | |
1186 | ||
1187 | /** | |
8056eb4a | 1188 | * self_check_vid_hdr - check that a volume identifier header is all right. |
801c135c AB |
1189 | * @ubi: UBI device description object |
1190 | * @pnum: physical eraseblock number the volume identifier header belongs to | |
1191 | * @vid_hdr: the volume identifier header to check | |
1192 | * | |
1193 | * This function returns zero if the volume identifier header is all right, and | |
adbf05e3 | 1194 | * %-EINVAL if not. |
801c135c | 1195 | */ |
8056eb4a AB |
1196 | static int self_check_vid_hdr(const struct ubi_device *ubi, int pnum, |
1197 | const struct ubi_vid_hdr *vid_hdr) | |
801c135c AB |
1198 | { |
1199 | int err; | |
1200 | uint32_t magic; | |
1201 | ||
64575574 | 1202 | if (!ubi_dbg_chk_io(ubi)) |
92d124f5 AB |
1203 | return 0; |
1204 | ||
3261ebd7 | 1205 | magic = be32_to_cpu(vid_hdr->magic); |
801c135c | 1206 | if (magic != UBI_VID_HDR_MAGIC) { |
32608703 | 1207 | ubi_err(ubi, "bad VID header magic %#08x at PEB %d, must be %#08x", |
801c135c AB |
1208 | magic, pnum, UBI_VID_HDR_MAGIC); |
1209 | goto fail; | |
1210 | } | |
1211 | ||
1212 | err = validate_vid_hdr(ubi, vid_hdr); | |
1213 | if (err) { | |
32608703 | 1214 | ubi_err(ubi, "self-check failed for PEB %d", pnum); |
801c135c AB |
1215 | goto fail; |
1216 | } | |
1217 | ||
1218 | return err; | |
1219 | ||
1220 | fail: | |
32608703 | 1221 | ubi_err(ubi, "self-check failed for PEB %d", pnum); |
a904e3f1 | 1222 | ubi_dump_vid_hdr(vid_hdr); |
25886a36 | 1223 | dump_stack(); |
adbf05e3 | 1224 | return -EINVAL; |
801c135c AB |
1225 | |
1226 | } | |
1227 | ||
1228 | /** | |
8056eb4a | 1229 | * self_check_peb_vid_hdr - check volume identifier header. |
801c135c AB |
1230 | * @ubi: UBI device description object |
1231 | * @pnum: the physical eraseblock number to check | |
1232 | * | |
1233 | * This function returns zero if the volume identifier header is all right, | |
adbf05e3 | 1234 | * and a negative error code if not or if an error occurred. |
801c135c | 1235 | */ |
8056eb4a | 1236 | static int self_check_peb_vid_hdr(const struct ubi_device *ubi, int pnum) |
801c135c AB |
1237 | { |
1238 | int err; | |
1239 | uint32_t crc, hdr_crc; | |
3291b52f | 1240 | struct ubi_vid_io_buf *vidb; |
801c135c AB |
1241 | struct ubi_vid_hdr *vid_hdr; |
1242 | void *p; | |
1243 | ||
64575574 | 1244 | if (!ubi_dbg_chk_io(ubi)) |
92d124f5 AB |
1245 | return 0; |
1246 | ||
3291b52f BB |
1247 | vidb = ubi_alloc_vid_buf(ubi, GFP_NOFS); |
1248 | if (!vidb) | |
801c135c AB |
1249 | return -ENOMEM; |
1250 | ||
3291b52f BB |
1251 | vid_hdr = ubi_get_vid_hdr(vidb); |
1252 | p = vidb->buffer; | |
801c135c AB |
1253 | err = ubi_io_read(ubi, p, pnum, ubi->vid_hdr_aloffset, |
1254 | ubi->vid_hdr_alsize); | |
d57f4054 | 1255 | if (err && err != UBI_IO_BITFLIPS && !mtd_is_eccerr(err)) |
801c135c AB |
1256 | goto exit; |
1257 | ||
2e69d491 | 1258 | crc = crc32(UBI_CRC32_INIT, vid_hdr, UBI_VID_HDR_SIZE_CRC); |
3261ebd7 | 1259 | hdr_crc = be32_to_cpu(vid_hdr->hdr_crc); |
801c135c | 1260 | if (hdr_crc != crc) { |
32608703 | 1261 | ubi_err(ubi, "bad VID header CRC at PEB %d, calculated %#08x, read %#08x", |
049333ce | 1262 | pnum, crc, hdr_crc); |
32608703 | 1263 | ubi_err(ubi, "self-check failed for PEB %d", pnum); |
a904e3f1 | 1264 | ubi_dump_vid_hdr(vid_hdr); |
25886a36 | 1265 | dump_stack(); |
adbf05e3 | 1266 | err = -EINVAL; |
801c135c AB |
1267 | goto exit; |
1268 | } | |
1269 | ||
8056eb4a | 1270 | err = self_check_vid_hdr(ubi, pnum, vid_hdr); |
801c135c AB |
1271 | |
1272 | exit: | |
3291b52f | 1273 | ubi_free_vid_buf(vidb); |
801c135c AB |
1274 | return err; |
1275 | } | |
1276 | ||
6e9065d7 | 1277 | /** |
97d6104b | 1278 | * self_check_write - make sure write succeeded. |
6e9065d7 AB |
1279 | * @ubi: UBI device description object |
1280 | * @buf: buffer with data which were written | |
1281 | * @pnum: physical eraseblock number the data were written to | |
1282 | * @offset: offset within the physical eraseblock the data were written to | |
1283 | * @len: how many bytes were written | |
1284 | * | |
1285 | * This functions reads data which were recently written and compares it with | |
1286 | * the original data buffer - the data have to match. Returns zero if the data | |
1287 | * match and a negative error code if not or in case of failure. | |
1288 | */ | |
97d6104b AB |
1289 | static int self_check_write(struct ubi_device *ubi, const void *buf, int pnum, |
1290 | int offset, int len) | |
6e9065d7 AB |
1291 | { |
1292 | int err, i; | |
7950d023 | 1293 | size_t read; |
a7586743 | 1294 | void *buf1; |
7950d023 | 1295 | loff_t addr = (loff_t)pnum * ubi->peb_size + offset; |
6e9065d7 | 1296 | |
64575574 | 1297 | if (!ubi_dbg_chk_io(ubi)) |
92d124f5 AB |
1298 | return 0; |
1299 | ||
3d46b316 | 1300 | buf1 = __vmalloc(len, GFP_NOFS, PAGE_KERNEL); |
a7586743 | 1301 | if (!buf1) { |
32608703 | 1302 | ubi_err(ubi, "cannot allocate memory to check writes"); |
a7586743 AB |
1303 | return 0; |
1304 | } | |
1305 | ||
329ad399 | 1306 | err = mtd_read(ubi->mtd, addr, len, &read, buf1); |
d57f4054 | 1307 | if (err && !mtd_is_bitflip(err)) |
a7586743 | 1308 | goto out_free; |
6e9065d7 AB |
1309 | |
1310 | for (i = 0; i < len; i++) { | |
1311 | uint8_t c = ((uint8_t *)buf)[i]; | |
a7586743 | 1312 | uint8_t c1 = ((uint8_t *)buf1)[i]; |
6e9065d7 AB |
1313 | int dump_len; |
1314 | ||
1315 | if (c == c1) | |
1316 | continue; | |
1317 | ||
32608703 | 1318 | ubi_err(ubi, "self-check failed for PEB %d:%d, len %d", |
6e9065d7 | 1319 | pnum, offset, len); |
32608703 | 1320 | ubi_msg(ubi, "data differ at position %d", i); |
6e9065d7 | 1321 | dump_len = max_t(int, 128, len - i); |
32608703 | 1322 | ubi_msg(ubi, "hex dump of the original buffer from %d to %d", |
6e9065d7 AB |
1323 | i, i + dump_len); |
1324 | print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_OFFSET, 32, 1, | |
1325 | buf + i, dump_len, 1); | |
32608703 | 1326 | ubi_msg(ubi, "hex dump of the read buffer from %d to %d", |
6e9065d7 AB |
1327 | i, i + dump_len); |
1328 | print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_OFFSET, 32, 1, | |
a7586743 | 1329 | buf1 + i, dump_len, 1); |
25886a36 | 1330 | dump_stack(); |
6e9065d7 | 1331 | err = -EINVAL; |
a7586743 | 1332 | goto out_free; |
6e9065d7 | 1333 | } |
6e9065d7 | 1334 | |
a7586743 | 1335 | vfree(buf1); |
6e9065d7 AB |
1336 | return 0; |
1337 | ||
a7586743 AB |
1338 | out_free: |
1339 | vfree(buf1); | |
6e9065d7 AB |
1340 | return err; |
1341 | } | |
1342 | ||
801c135c | 1343 | /** |
97d6104b | 1344 | * ubi_self_check_all_ff - check that a region of flash is empty. |
801c135c AB |
1345 | * @ubi: UBI device description object |
1346 | * @pnum: the physical eraseblock number to check | |
1347 | * @offset: the starting offset within the physical eraseblock to check | |
1348 | * @len: the length of the region to check | |
1349 | * | |
1350 | * This function returns zero if only 0xFF bytes are present at offset | |
adbf05e3 AB |
1351 | * @offset of the physical eraseblock @pnum, and a negative error code if not |
1352 | * or if an error occurred. | |
801c135c | 1353 | */ |
97d6104b | 1354 | int ubi_self_check_all_ff(struct ubi_device *ubi, int pnum, int offset, int len) |
801c135c AB |
1355 | { |
1356 | size_t read; | |
1357 | int err; | |
332873d6 | 1358 | void *buf; |
801c135c AB |
1359 | loff_t addr = (loff_t)pnum * ubi->peb_size + offset; |
1360 | ||
64575574 | 1361 | if (!ubi_dbg_chk_io(ubi)) |
92d124f5 AB |
1362 | return 0; |
1363 | ||
3d46b316 | 1364 | buf = __vmalloc(len, GFP_NOFS, PAGE_KERNEL); |
332873d6 | 1365 | if (!buf) { |
32608703 | 1366 | ubi_err(ubi, "cannot allocate memory to check for 0xFFs"); |
332873d6 AB |
1367 | return 0; |
1368 | } | |
1369 | ||
329ad399 | 1370 | err = mtd_read(ubi->mtd, addr, len, &read, buf); |
d57f4054 | 1371 | if (err && !mtd_is_bitflip(err)) { |
32608703 | 1372 | ubi_err(ubi, "err %d while reading %d bytes from PEB %d:%d, read %zd bytes", |
049333ce | 1373 | err, len, pnum, offset, read); |
801c135c AB |
1374 | goto error; |
1375 | } | |
1376 | ||
332873d6 | 1377 | err = ubi_check_pattern(buf, 0xFF, len); |
801c135c | 1378 | if (err == 0) { |
32608703 | 1379 | ubi_err(ubi, "flash region at PEB %d:%d, length %d does not contain all 0xFF bytes", |
049333ce | 1380 | pnum, offset, len); |
801c135c AB |
1381 | goto fail; |
1382 | } | |
1383 | ||
332873d6 | 1384 | vfree(buf); |
801c135c AB |
1385 | return 0; |
1386 | ||
1387 | fail: | |
32608703 | 1388 | ubi_err(ubi, "self-check failed for PEB %d", pnum); |
45fc5c81 | 1389 | ubi_msg(ubi, "hex dump of the %d-%d region", offset, offset + len); |
332873d6 | 1390 | print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_OFFSET, 32, 1, buf, len, 1); |
adbf05e3 | 1391 | err = -EINVAL; |
801c135c | 1392 | error: |
25886a36 | 1393 | dump_stack(); |
332873d6 | 1394 | vfree(buf); |
801c135c AB |
1395 | return err; |
1396 | } |