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801c135c AB |
1 | /* |
2 | * Copyright (c) International Business Machines Corp., 2006 | |
3 | * Copyright (c) Nokia Corporation, 2006, 2007 | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License as published by | |
7 | * the Free Software Foundation; either version 2 of the License, or | |
8 | * (at your option) any later version. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See | |
13 | * the GNU General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with this program; if not, write to the Free Software | |
17 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
18 | * | |
19 | * Author: Artem Bityutskiy (Битюцкий Артём) | |
20 | */ | |
21 | ||
22 | /* | |
23 | * UBI input/output unit. | |
24 | * | |
25 | * This unit provides a uniform way to work with all kinds of the underlying | |
26 | * MTD devices. It also implements handy functions for reading and writing UBI | |
27 | * headers. | |
28 | * | |
29 | * We are trying to have a paranoid mindset and not to trust to what we read | |
30 | * from the flash media in order to be more secure and robust. So this unit | |
31 | * validates every single header it reads from the flash media. | |
32 | * | |
33 | * Some words about how the eraseblock headers are stored. | |
34 | * | |
35 | * The erase counter header is always stored at offset zero. By default, the | |
36 | * VID header is stored after the EC header at the closest aligned offset | |
37 | * (i.e. aligned to the minimum I/O unit size). Data starts next to the VID | |
38 | * header at the closest aligned offset. But this default layout may be | |
39 | * changed. For example, for different reasons (e.g., optimization) UBI may be | |
40 | * asked to put the VID header at further offset, and even at an unaligned | |
41 | * offset. Of course, if the offset of the VID header is unaligned, UBI adds | |
42 | * proper padding in front of it. Data offset may also be changed but it has to | |
43 | * be aligned. | |
44 | * | |
45 | * About minimal I/O units. In general, UBI assumes flash device model where | |
46 | * there is only one minimal I/O unit size. E.g., in case of NOR flash it is 1, | |
47 | * in case of NAND flash it is a NAND page, etc. This is reported by MTD in the | |
48 | * @ubi->mtd->writesize field. But as an exception, UBI admits of using another | |
49 | * (smaller) minimal I/O unit size for EC and VID headers to make it possible | |
50 | * to do different optimizations. | |
51 | * | |
52 | * This is extremely useful in case of NAND flashes which admit of several | |
53 | * write operations to one NAND page. In this case UBI can fit EC and VID | |
54 | * headers at one NAND page. Thus, UBI may use "sub-page" size as the minimal | |
55 | * I/O unit for the headers (the @ubi->hdrs_min_io_size field). But it still | |
56 | * reports NAND page size (@ubi->min_io_size) as a minimal I/O unit for the UBI | |
57 | * users. | |
58 | * | |
59 | * Example: some Samsung NANDs with 2KiB pages allow 4x 512-byte writes, so | |
60 | * although the minimal I/O unit is 2K, UBI uses 512 bytes for EC and VID | |
61 | * headers. | |
62 | * | |
63 | * Q: why not just to treat sub-page as a minimal I/O unit of this flash | |
64 | * device, e.g., make @ubi->min_io_size = 512 in the example above? | |
65 | * | |
66 | * A: because when writing a sub-page, MTD still writes a full 2K page but the | |
67 | * bytes which are no relevant to the sub-page are 0xFF. So, basically, writing | |
68 | * 4x512 sub-pages is 4 times slower then writing one 2KiB NAND page. Thus, we | |
69 | * prefer to use sub-pages only for EV and VID headers. | |
70 | * | |
71 | * As it was noted above, the VID header may start at a non-aligned offset. | |
72 | * For example, in case of a 2KiB page NAND flash with a 512 bytes sub-page, | |
73 | * the VID header may reside at offset 1984 which is the last 64 bytes of the | |
74 | * last sub-page (EC header is always at offset zero). This causes some | |
75 | * difficulties when reading and writing VID headers. | |
76 | * | |
77 | * Suppose we have a 64-byte buffer and we read a VID header at it. We change | |
78 | * the data and want to write this VID header out. As we can only write in | |
79 | * 512-byte chunks, we have to allocate one more buffer and copy our VID header | |
80 | * to offset 448 of this buffer. | |
81 | * | |
82 | * The I/O unit does the following trick in order to avoid this extra copy. | |
83 | * It always allocates a @ubi->vid_hdr_alsize bytes buffer for the VID header | |
84 | * and returns a pointer to offset @ubi->vid_hdr_shift of this buffer. When the | |
85 | * VID header is being written out, it shifts the VID header pointer back and | |
86 | * writes the whole sub-page. | |
87 | */ | |
88 | ||
89 | #include <linux/crc32.h> | |
90 | #include <linux/err.h> | |
91 | #include "ubi.h" | |
92 | ||
93 | #ifdef CONFIG_MTD_UBI_DEBUG_PARANOID | |
94 | static int paranoid_check_not_bad(const struct ubi_device *ubi, int pnum); | |
95 | static int paranoid_check_peb_ec_hdr(const struct ubi_device *ubi, int pnum); | |
96 | static int paranoid_check_ec_hdr(const struct ubi_device *ubi, int pnum, | |
97 | const struct ubi_ec_hdr *ec_hdr); | |
98 | static int paranoid_check_peb_vid_hdr(const struct ubi_device *ubi, int pnum); | |
99 | static int paranoid_check_vid_hdr(const struct ubi_device *ubi, int pnum, | |
100 | const struct ubi_vid_hdr *vid_hdr); | |
101 | static int paranoid_check_all_ff(const struct ubi_device *ubi, int pnum, | |
102 | int offset, int len); | |
103 | #else | |
104 | #define paranoid_check_not_bad(ubi, pnum) 0 | |
105 | #define paranoid_check_peb_ec_hdr(ubi, pnum) 0 | |
106 | #define paranoid_check_ec_hdr(ubi, pnum, ec_hdr) 0 | |
107 | #define paranoid_check_peb_vid_hdr(ubi, pnum) 0 | |
108 | #define paranoid_check_vid_hdr(ubi, pnum, vid_hdr) 0 | |
109 | #define paranoid_check_all_ff(ubi, pnum, offset, len) 0 | |
110 | #endif | |
111 | ||
112 | /** | |
113 | * ubi_io_read - read data from a physical eraseblock. | |
114 | * @ubi: UBI device description object | |
115 | * @buf: buffer where to store the read data | |
116 | * @pnum: physical eraseblock number to read from | |
117 | * @offset: offset within the physical eraseblock from where to read | |
118 | * @len: how many bytes to read | |
119 | * | |
120 | * This function reads data from offset @offset of physical eraseblock @pnum | |
121 | * and stores the read data in the @buf buffer. The following return codes are | |
122 | * possible: | |
123 | * | |
124 | * o %0 if all the requested data were successfully read; | |
125 | * o %UBI_IO_BITFLIPS if all the requested data were successfully read, but | |
126 | * correctable bit-flips were detected; this is harmless but may indicate | |
127 | * that this eraseblock may become bad soon (but do not have to); | |
128 | * o %-EBADMSG if the MTD subsystem reported about data data integrity | |
129 | * problems, for example it can me an ECC error in case of NAND; this most | |
130 | * probably means that the data is corrupted; | |
131 | * o %-EIO if some I/O error occurred; | |
132 | * o other negative error codes in case of other errors. | |
133 | */ | |
134 | int ubi_io_read(const struct ubi_device *ubi, void *buf, int pnum, int offset, | |
135 | int len) | |
136 | { | |
137 | int err, retries = 0; | |
138 | size_t read; | |
139 | loff_t addr; | |
140 | ||
141 | dbg_io("read %d bytes from PEB %d:%d", len, pnum, offset); | |
142 | ||
143 | ubi_assert(pnum >= 0 && pnum < ubi->peb_count); | |
144 | ubi_assert(offset >= 0 && offset + len <= ubi->peb_size); | |
145 | ubi_assert(len > 0); | |
146 | ||
147 | err = paranoid_check_not_bad(ubi, pnum); | |
148 | if (err) | |
149 | return err > 0 ? -EINVAL : err; | |
150 | ||
151 | addr = (loff_t)pnum * ubi->peb_size + offset; | |
152 | retry: | |
153 | err = ubi->mtd->read(ubi->mtd, addr, len, &read, buf); | |
154 | if (err) { | |
155 | if (err == -EUCLEAN) { | |
156 | /* | |
157 | * -EUCLEAN is reported if there was a bit-flip which | |
158 | * was corrected, so this is harmless. | |
159 | */ | |
160 | ubi_msg("fixable bit-flip detected at PEB %d", pnum); | |
161 | ubi_assert(len == read); | |
162 | return UBI_IO_BITFLIPS; | |
163 | } | |
164 | ||
165 | if (read != len && retries++ < UBI_IO_RETRIES) { | |
166 | dbg_io("error %d while reading %d bytes from PEB %d:%d, " | |
167 | "read only %zd bytes, retry", | |
168 | err, len, pnum, offset, read); | |
169 | yield(); | |
170 | goto retry; | |
171 | } | |
172 | ||
173 | ubi_err("error %d while reading %d bytes from PEB %d:%d, " | |
174 | "read %zd bytes", err, len, pnum, offset, read); | |
175 | ubi_dbg_dump_stack(); | |
176 | } else { | |
177 | ubi_assert(len == read); | |
178 | ||
179 | if (ubi_dbg_is_bitflip()) { | |
180 | dbg_msg("bit-flip (emulated)"); | |
181 | err = UBI_IO_BITFLIPS; | |
182 | } | |
183 | } | |
184 | ||
185 | return err; | |
186 | } | |
187 | ||
188 | /** | |
189 | * ubi_io_write - write data to a physical eraseblock. | |
190 | * @ubi: UBI device description object | |
191 | * @buf: buffer with the data to write | |
192 | * @pnum: physical eraseblock number to write to | |
193 | * @offset: offset within the physical eraseblock where to write | |
194 | * @len: how many bytes to write | |
195 | * | |
196 | * This function writes @len bytes of data from buffer @buf to offset @offset | |
197 | * of physical eraseblock @pnum. If all the data were successfully written, | |
198 | * zero is returned. If an error occurred, this function returns a negative | |
199 | * error code. If %-EIO is returned, the physical eraseblock most probably went | |
200 | * bad. | |
201 | * | |
202 | * Note, in case of an error, it is possible that something was still written | |
203 | * to the flash media, but may be some garbage. | |
204 | */ | |
205 | int ubi_io_write(const struct ubi_device *ubi, const void *buf, int pnum, | |
206 | int offset, int len) | |
207 | { | |
208 | int err; | |
209 | size_t written; | |
210 | loff_t addr; | |
211 | ||
212 | dbg_io("write %d bytes to PEB %d:%d", len, pnum, offset); | |
213 | ||
214 | ubi_assert(pnum >= 0 && pnum < ubi->peb_count); | |
215 | ubi_assert(offset >= 0 && offset + len <= ubi->peb_size); | |
216 | ubi_assert(offset % ubi->hdrs_min_io_size == 0); | |
217 | ubi_assert(len > 0 && len % ubi->hdrs_min_io_size == 0); | |
218 | ||
219 | if (ubi->ro_mode) { | |
220 | ubi_err("read-only mode"); | |
221 | return -EROFS; | |
222 | } | |
223 | ||
224 | /* The below has to be compiled out if paranoid checks are disabled */ | |
225 | ||
226 | err = paranoid_check_not_bad(ubi, pnum); | |
227 | if (err) | |
228 | return err > 0 ? -EINVAL : err; | |
229 | ||
230 | /* The area we are writing to has to contain all 0xFF bytes */ | |
231 | err = paranoid_check_all_ff(ubi, pnum, offset, len); | |
232 | if (err) | |
233 | return err > 0 ? -EINVAL : err; | |
234 | ||
235 | if (offset >= ubi->leb_start) { | |
236 | /* | |
237 | * We write to the data area of the physical eraseblock. Make | |
238 | * sure it has valid EC and VID headers. | |
239 | */ | |
240 | err = paranoid_check_peb_ec_hdr(ubi, pnum); | |
241 | if (err) | |
242 | return err > 0 ? -EINVAL : err; | |
243 | err = paranoid_check_peb_vid_hdr(ubi, pnum); | |
244 | if (err) | |
245 | return err > 0 ? -EINVAL : err; | |
246 | } | |
247 | ||
248 | if (ubi_dbg_is_write_failure()) { | |
249 | dbg_err("cannot write %d bytes to PEB %d:%d " | |
250 | "(emulated)", len, pnum, offset); | |
251 | ubi_dbg_dump_stack(); | |
252 | return -EIO; | |
253 | } | |
254 | ||
255 | addr = (loff_t)pnum * ubi->peb_size + offset; | |
256 | err = ubi->mtd->write(ubi->mtd, addr, len, &written, buf); | |
257 | if (err) { | |
258 | ubi_err("error %d while writing %d bytes to PEB %d:%d, written" | |
259 | " %zd bytes", err, len, pnum, offset, written); | |
260 | ubi_dbg_dump_stack(); | |
261 | } else | |
262 | ubi_assert(written == len); | |
263 | ||
264 | return err; | |
265 | } | |
266 | ||
267 | /** | |
268 | * erase_callback - MTD erasure call-back. | |
269 | * @ei: MTD erase information object. | |
270 | * | |
271 | * Note, even though MTD erase interface is asynchronous, all the current | |
272 | * implementations are synchronous anyway. | |
273 | */ | |
274 | static void erase_callback(struct erase_info *ei) | |
275 | { | |
276 | wake_up_interruptible((wait_queue_head_t *)ei->priv); | |
277 | } | |
278 | ||
279 | /** | |
280 | * do_sync_erase - synchronously erase a physical eraseblock. | |
281 | * @ubi: UBI device description object | |
282 | * @pnum: the physical eraseblock number to erase | |
283 | * | |
284 | * This function synchronously erases physical eraseblock @pnum and returns | |
285 | * zero in case of success and a negative error code in case of failure. If | |
286 | * %-EIO is returned, the physical eraseblock most probably went bad. | |
287 | */ | |
288 | static int do_sync_erase(const struct ubi_device *ubi, int pnum) | |
289 | { | |
290 | int err, retries = 0; | |
291 | struct erase_info ei; | |
292 | wait_queue_head_t wq; | |
293 | ||
294 | dbg_io("erase PEB %d", pnum); | |
295 | ||
296 | retry: | |
297 | init_waitqueue_head(&wq); | |
298 | memset(&ei, 0, sizeof(struct erase_info)); | |
299 | ||
300 | ei.mtd = ubi->mtd; | |
301 | ei.addr = pnum * ubi->peb_size; | |
302 | ei.len = ubi->peb_size; | |
303 | ei.callback = erase_callback; | |
304 | ei.priv = (unsigned long)&wq; | |
305 | ||
306 | err = ubi->mtd->erase(ubi->mtd, &ei); | |
307 | if (err) { | |
308 | if (retries++ < UBI_IO_RETRIES) { | |
309 | dbg_io("error %d while erasing PEB %d, retry", | |
310 | err, pnum); | |
311 | yield(); | |
312 | goto retry; | |
313 | } | |
314 | ubi_err("cannot erase PEB %d, error %d", pnum, err); | |
315 | ubi_dbg_dump_stack(); | |
316 | return err; | |
317 | } | |
318 | ||
319 | err = wait_event_interruptible(wq, ei.state == MTD_ERASE_DONE || | |
320 | ei.state == MTD_ERASE_FAILED); | |
321 | if (err) { | |
322 | ubi_err("interrupted PEB %d erasure", pnum); | |
323 | return -EINTR; | |
324 | } | |
325 | ||
326 | if (ei.state == MTD_ERASE_FAILED) { | |
327 | if (retries++ < UBI_IO_RETRIES) { | |
328 | dbg_io("error while erasing PEB %d, retry", pnum); | |
329 | yield(); | |
330 | goto retry; | |
331 | } | |
332 | ubi_err("cannot erase PEB %d", pnum); | |
333 | ubi_dbg_dump_stack(); | |
334 | return -EIO; | |
335 | } | |
336 | ||
337 | err = paranoid_check_all_ff(ubi, pnum, 0, ubi->peb_size); | |
338 | if (err) | |
339 | return err > 0 ? -EINVAL : err; | |
340 | ||
341 | if (ubi_dbg_is_erase_failure() && !err) { | |
342 | dbg_err("cannot erase PEB %d (emulated)", pnum); | |
343 | return -EIO; | |
344 | } | |
345 | ||
346 | return 0; | |
347 | } | |
348 | ||
349 | /** | |
350 | * check_pattern - check if buffer contains only a certain byte pattern. | |
351 | * @buf: buffer to check | |
352 | * @patt: the pattern to check | |
353 | * @size: buffer size in bytes | |
354 | * | |
355 | * This function returns %1 in there are only @patt bytes in @buf, and %0 if | |
356 | * something else was also found. | |
357 | */ | |
358 | static int check_pattern(const void *buf, uint8_t patt, int size) | |
359 | { | |
360 | int i; | |
361 | ||
362 | for (i = 0; i < size; i++) | |
363 | if (((const uint8_t *)buf)[i] != patt) | |
364 | return 0; | |
365 | return 1; | |
366 | } | |
367 | ||
368 | /* Patterns to write to a physical eraseblock when torturing it */ | |
369 | static uint8_t patterns[] = {0xa5, 0x5a, 0x0}; | |
370 | ||
371 | /** | |
372 | * torture_peb - test a supposedly bad physical eraseblock. | |
373 | * @ubi: UBI device description object | |
374 | * @pnum: the physical eraseblock number to test | |
375 | * | |
376 | * This function returns %-EIO if the physical eraseblock did not pass the | |
377 | * test, a positive number of erase operations done if the test was | |
378 | * successfully passed, and other negative error codes in case of other errors. | |
379 | */ | |
380 | static int torture_peb(const struct ubi_device *ubi, int pnum) | |
381 | { | |
382 | void *buf; | |
383 | int err, i, patt_count; | |
384 | ||
92ad8f37 | 385 | buf = vmalloc(ubi->peb_size); |
801c135c AB |
386 | if (!buf) |
387 | return -ENOMEM; | |
388 | ||
389 | patt_count = ARRAY_SIZE(patterns); | |
390 | ubi_assert(patt_count > 0); | |
391 | ||
392 | for (i = 0; i < patt_count; i++) { | |
393 | err = do_sync_erase(ubi, pnum); | |
394 | if (err) | |
395 | goto out; | |
396 | ||
397 | /* Make sure the PEB contains only 0xFF bytes */ | |
398 | err = ubi_io_read(ubi, buf, pnum, 0, ubi->peb_size); | |
399 | if (err) | |
400 | goto out; | |
401 | ||
402 | err = check_pattern(buf, 0xFF, ubi->peb_size); | |
403 | if (err == 0) { | |
404 | ubi_err("erased PEB %d, but a non-0xFF byte found", | |
405 | pnum); | |
406 | err = -EIO; | |
407 | goto out; | |
408 | } | |
409 | ||
410 | /* Write a pattern and check it */ | |
411 | memset(buf, patterns[i], ubi->peb_size); | |
412 | err = ubi_io_write(ubi, buf, pnum, 0, ubi->peb_size); | |
413 | if (err) | |
414 | goto out; | |
415 | ||
416 | memset(buf, ~patterns[i], ubi->peb_size); | |
417 | err = ubi_io_read(ubi, buf, pnum, 0, ubi->peb_size); | |
418 | if (err) | |
419 | goto out; | |
420 | ||
421 | err = check_pattern(buf, patterns[i], ubi->peb_size); | |
422 | if (err == 0) { | |
423 | ubi_err("pattern %x checking failed for PEB %d", | |
424 | patterns[i], pnum); | |
425 | err = -EIO; | |
426 | goto out; | |
427 | } | |
428 | } | |
429 | ||
430 | err = patt_count; | |
431 | ||
432 | out: | |
433 | if (err == UBI_IO_BITFLIPS || err == -EBADMSG) | |
434 | /* | |
435 | * If a bit-flip or data integrity error was detected, the test | |
436 | * has not passed because it happened on a freshly erased | |
437 | * physical eraseblock which means something is wrong with it. | |
438 | */ | |
439 | err = -EIO; | |
92ad8f37 | 440 | vfree(buf); |
801c135c AB |
441 | return err; |
442 | } | |
443 | ||
444 | /** | |
445 | * ubi_io_sync_erase - synchronously erase a physical eraseblock. | |
446 | * @ubi: UBI device description object | |
447 | * @pnum: physical eraseblock number to erase | |
448 | * @torture: if this physical eraseblock has to be tortured | |
449 | * | |
450 | * This function synchronously erases physical eraseblock @pnum. If @torture | |
451 | * flag is not zero, the physical eraseblock is checked by means of writing | |
452 | * different patterns to it and reading them back. If the torturing is enabled, | |
453 | * the physical eraseblock is erased more then once. | |
454 | * | |
455 | * This function returns the number of erasures made in case of success, %-EIO | |
456 | * if the erasure failed or the torturing test failed, and other negative error | |
457 | * codes in case of other errors. Note, %-EIO means that the physical | |
458 | * eraseblock is bad. | |
459 | */ | |
460 | int ubi_io_sync_erase(const struct ubi_device *ubi, int pnum, int torture) | |
461 | { | |
462 | int err, ret = 0; | |
463 | ||
464 | ubi_assert(pnum >= 0 && pnum < ubi->peb_count); | |
465 | ||
466 | err = paranoid_check_not_bad(ubi, pnum); | |
467 | if (err != 0) | |
468 | return err > 0 ? -EINVAL : err; | |
469 | ||
470 | if (ubi->ro_mode) { | |
471 | ubi_err("read-only mode"); | |
472 | return -EROFS; | |
473 | } | |
474 | ||
475 | if (torture) { | |
476 | ret = torture_peb(ubi, pnum); | |
477 | if (ret < 0) | |
478 | return ret; | |
479 | } | |
480 | ||
481 | err = do_sync_erase(ubi, pnum); | |
482 | if (err) | |
483 | return err; | |
484 | ||
485 | return ret + 1; | |
486 | } | |
487 | ||
488 | /** | |
489 | * ubi_io_is_bad - check if a physical eraseblock is bad. | |
490 | * @ubi: UBI device description object | |
491 | * @pnum: the physical eraseblock number to check | |
492 | * | |
493 | * This function returns a positive number if the physical eraseblock is bad, | |
494 | * zero if not, and a negative error code if an error occurred. | |
495 | */ | |
496 | int ubi_io_is_bad(const struct ubi_device *ubi, int pnum) | |
497 | { | |
498 | struct mtd_info *mtd = ubi->mtd; | |
499 | ||
500 | ubi_assert(pnum >= 0 && pnum < ubi->peb_count); | |
501 | ||
502 | if (ubi->bad_allowed) { | |
503 | int ret; | |
504 | ||
505 | ret = mtd->block_isbad(mtd, (loff_t)pnum * ubi->peb_size); | |
506 | if (ret < 0) | |
507 | ubi_err("error %d while checking if PEB %d is bad", | |
508 | ret, pnum); | |
509 | else if (ret) | |
510 | dbg_io("PEB %d is bad", pnum); | |
511 | return ret; | |
512 | } | |
513 | ||
514 | return 0; | |
515 | } | |
516 | ||
517 | /** | |
518 | * ubi_io_mark_bad - mark a physical eraseblock as bad. | |
519 | * @ubi: UBI device description object | |
520 | * @pnum: the physical eraseblock number to mark | |
521 | * | |
522 | * This function returns zero in case of success and a negative error code in | |
523 | * case of failure. | |
524 | */ | |
525 | int ubi_io_mark_bad(const struct ubi_device *ubi, int pnum) | |
526 | { | |
527 | int err; | |
528 | struct mtd_info *mtd = ubi->mtd; | |
529 | ||
530 | ubi_assert(pnum >= 0 && pnum < ubi->peb_count); | |
531 | ||
532 | if (ubi->ro_mode) { | |
533 | ubi_err("read-only mode"); | |
534 | return -EROFS; | |
535 | } | |
536 | ||
537 | if (!ubi->bad_allowed) | |
538 | return 0; | |
539 | ||
540 | err = mtd->block_markbad(mtd, (loff_t)pnum * ubi->peb_size); | |
541 | if (err) | |
542 | ubi_err("cannot mark PEB %d bad, error %d", pnum, err); | |
543 | return err; | |
544 | } | |
545 | ||
546 | /** | |
547 | * validate_ec_hdr - validate an erase counter header. | |
548 | * @ubi: UBI device description object | |
549 | * @ec_hdr: the erase counter header to check | |
550 | * | |
551 | * This function returns zero if the erase counter header is OK, and %1 if | |
552 | * not. | |
553 | */ | |
554 | static int validate_ec_hdr(const struct ubi_device *ubi, | |
555 | const struct ubi_ec_hdr *ec_hdr) | |
556 | { | |
557 | long long ec; | |
558 | int vid_hdr_offset, leb_start; | |
559 | ||
3261ebd7 CH |
560 | ec = be64_to_cpu(ec_hdr->ec); |
561 | vid_hdr_offset = be32_to_cpu(ec_hdr->vid_hdr_offset); | |
562 | leb_start = be32_to_cpu(ec_hdr->data_offset); | |
801c135c AB |
563 | |
564 | if (ec_hdr->version != UBI_VERSION) { | |
565 | ubi_err("node with incompatible UBI version found: " | |
566 | "this UBI version is %d, image version is %d", | |
567 | UBI_VERSION, (int)ec_hdr->version); | |
568 | goto bad; | |
569 | } | |
570 | ||
571 | if (vid_hdr_offset != ubi->vid_hdr_offset) { | |
572 | ubi_err("bad VID header offset %d, expected %d", | |
573 | vid_hdr_offset, ubi->vid_hdr_offset); | |
574 | goto bad; | |
575 | } | |
576 | ||
577 | if (leb_start != ubi->leb_start) { | |
578 | ubi_err("bad data offset %d, expected %d", | |
579 | leb_start, ubi->leb_start); | |
580 | goto bad; | |
581 | } | |
582 | ||
583 | if (ec < 0 || ec > UBI_MAX_ERASECOUNTER) { | |
584 | ubi_err("bad erase counter %lld", ec); | |
585 | goto bad; | |
586 | } | |
587 | ||
588 | return 0; | |
589 | ||
590 | bad: | |
591 | ubi_err("bad EC header"); | |
592 | ubi_dbg_dump_ec_hdr(ec_hdr); | |
593 | ubi_dbg_dump_stack(); | |
594 | return 1; | |
595 | } | |
596 | ||
597 | /** | |
598 | * ubi_io_read_ec_hdr - read and check an erase counter header. | |
599 | * @ubi: UBI device description object | |
600 | * @pnum: physical eraseblock to read from | |
601 | * @ec_hdr: a &struct ubi_ec_hdr object where to store the read erase counter | |
602 | * header | |
603 | * @verbose: be verbose if the header is corrupted or was not found | |
604 | * | |
605 | * This function reads erase counter header from physical eraseblock @pnum and | |
606 | * stores it in @ec_hdr. This function also checks CRC checksum of the read | |
607 | * erase counter header. The following codes may be returned: | |
608 | * | |
609 | * o %0 if the CRC checksum is correct and the header was successfully read; | |
610 | * o %UBI_IO_BITFLIPS if the CRC is correct, but bit-flips were detected | |
611 | * and corrected by the flash driver; this is harmless but may indicate that | |
612 | * this eraseblock may become bad soon (but may be not); | |
613 | * o %UBI_IO_BAD_EC_HDR if the erase counter header is corrupted (a CRC error); | |
614 | * o %UBI_IO_PEB_EMPTY if the physical eraseblock is empty; | |
615 | * o a negative error code in case of failure. | |
616 | */ | |
617 | int ubi_io_read_ec_hdr(const struct ubi_device *ubi, int pnum, | |
618 | struct ubi_ec_hdr *ec_hdr, int verbose) | |
619 | { | |
620 | int err, read_err = 0; | |
621 | uint32_t crc, magic, hdr_crc; | |
622 | ||
623 | dbg_io("read EC header from PEB %d", pnum); | |
624 | ubi_assert(pnum >= 0 && pnum < ubi->peb_count); | |
625 | ||
626 | err = ubi_io_read(ubi, ec_hdr, pnum, 0, UBI_EC_HDR_SIZE); | |
627 | if (err) { | |
628 | if (err != UBI_IO_BITFLIPS && err != -EBADMSG) | |
629 | return err; | |
630 | ||
631 | /* | |
632 | * We read all the data, but either a correctable bit-flip | |
633 | * occurred, or MTD reported about some data integrity error, | |
634 | * like an ECC error in case of NAND. The former is harmless, | |
635 | * the later may mean that the read data is corrupted. But we | |
636 | * have a CRC check-sum and we will detect this. If the EC | |
637 | * header is still OK, we just report this as there was a | |
638 | * bit-flip. | |
639 | */ | |
640 | read_err = err; | |
641 | } | |
642 | ||
3261ebd7 | 643 | magic = be32_to_cpu(ec_hdr->magic); |
801c135c AB |
644 | if (magic != UBI_EC_HDR_MAGIC) { |
645 | /* | |
646 | * The magic field is wrong. Let's check if we have read all | |
647 | * 0xFF. If yes, this physical eraseblock is assumed to be | |
648 | * empty. | |
649 | * | |
650 | * But if there was a read error, we do not test it for all | |
651 | * 0xFFs. Even if it does contain all 0xFFs, this error | |
652 | * indicates that something is still wrong with this physical | |
653 | * eraseblock and we anyway cannot treat it as empty. | |
654 | */ | |
655 | if (read_err != -EBADMSG && | |
656 | check_pattern(ec_hdr, 0xFF, UBI_EC_HDR_SIZE)) { | |
657 | /* The physical eraseblock is supposedly empty */ | |
658 | ||
659 | /* | |
660 | * The below is just a paranoid check, it has to be | |
661 | * compiled out if paranoid checks are disabled. | |
662 | */ | |
663 | err = paranoid_check_all_ff(ubi, pnum, 0, | |
664 | ubi->peb_size); | |
665 | if (err) | |
666 | return err > 0 ? UBI_IO_BAD_EC_HDR : err; | |
667 | ||
668 | if (verbose) | |
669 | ubi_warn("no EC header found at PEB %d, " | |
670 | "only 0xFF bytes", pnum); | |
671 | return UBI_IO_PEB_EMPTY; | |
672 | } | |
673 | ||
674 | /* | |
675 | * This is not a valid erase counter header, and these are not | |
676 | * 0xFF bytes. Report that the header is corrupted. | |
677 | */ | |
678 | if (verbose) { | |
679 | ubi_warn("bad magic number at PEB %d: %08x instead of " | |
680 | "%08x", pnum, magic, UBI_EC_HDR_MAGIC); | |
681 | ubi_dbg_dump_ec_hdr(ec_hdr); | |
682 | } | |
683 | return UBI_IO_BAD_EC_HDR; | |
684 | } | |
685 | ||
686 | crc = crc32(UBI_CRC32_INIT, ec_hdr, UBI_EC_HDR_SIZE_CRC); | |
3261ebd7 | 687 | hdr_crc = be32_to_cpu(ec_hdr->hdr_crc); |
801c135c AB |
688 | |
689 | if (hdr_crc != crc) { | |
690 | if (verbose) { | |
691 | ubi_warn("bad EC header CRC at PEB %d, calculated %#08x," | |
692 | " read %#08x", pnum, crc, hdr_crc); | |
693 | ubi_dbg_dump_ec_hdr(ec_hdr); | |
694 | } | |
695 | return UBI_IO_BAD_EC_HDR; | |
696 | } | |
697 | ||
698 | /* And of course validate what has just been read from the media */ | |
699 | err = validate_ec_hdr(ubi, ec_hdr); | |
700 | if (err) { | |
701 | ubi_err("validation failed for PEB %d", pnum); | |
702 | return -EINVAL; | |
703 | } | |
704 | ||
705 | return read_err ? UBI_IO_BITFLIPS : 0; | |
706 | } | |
707 | ||
708 | /** | |
709 | * ubi_io_write_ec_hdr - write an erase counter header. | |
710 | * @ubi: UBI device description object | |
711 | * @pnum: physical eraseblock to write to | |
712 | * @ec_hdr: the erase counter header to write | |
713 | * | |
714 | * This function writes erase counter header described by @ec_hdr to physical | |
715 | * eraseblock @pnum. It also fills most fields of @ec_hdr before writing, so | |
716 | * the caller do not have to fill them. Callers must only fill the @ec_hdr->ec | |
717 | * field. | |
718 | * | |
719 | * This function returns zero in case of success and a negative error code in | |
720 | * case of failure. If %-EIO is returned, the physical eraseblock most probably | |
721 | * went bad. | |
722 | */ | |
723 | int ubi_io_write_ec_hdr(const struct ubi_device *ubi, int pnum, | |
724 | struct ubi_ec_hdr *ec_hdr) | |
725 | { | |
726 | int err; | |
727 | uint32_t crc; | |
728 | ||
729 | dbg_io("write EC header to PEB %d", pnum); | |
730 | ubi_assert(pnum >= 0 && pnum < ubi->peb_count); | |
731 | ||
3261ebd7 | 732 | ec_hdr->magic = cpu_to_be32(UBI_EC_HDR_MAGIC); |
801c135c | 733 | ec_hdr->version = UBI_VERSION; |
3261ebd7 CH |
734 | ec_hdr->vid_hdr_offset = cpu_to_be32(ubi->vid_hdr_offset); |
735 | ec_hdr->data_offset = cpu_to_be32(ubi->leb_start); | |
801c135c | 736 | crc = crc32(UBI_CRC32_INIT, ec_hdr, UBI_EC_HDR_SIZE_CRC); |
3261ebd7 | 737 | ec_hdr->hdr_crc = cpu_to_be32(crc); |
801c135c AB |
738 | |
739 | err = paranoid_check_ec_hdr(ubi, pnum, ec_hdr); | |
740 | if (err) | |
741 | return -EINVAL; | |
742 | ||
743 | err = ubi_io_write(ubi, ec_hdr, pnum, 0, ubi->ec_hdr_alsize); | |
744 | return err; | |
745 | } | |
746 | ||
747 | /** | |
748 | * validate_vid_hdr - validate a volume identifier header. | |
749 | * @ubi: UBI device description object | |
750 | * @vid_hdr: the volume identifier header to check | |
751 | * | |
752 | * This function checks that data stored in the volume identifier header | |
753 | * @vid_hdr. Returns zero if the VID header is OK and %1 if not. | |
754 | */ | |
755 | static int validate_vid_hdr(const struct ubi_device *ubi, | |
756 | const struct ubi_vid_hdr *vid_hdr) | |
757 | { | |
758 | int vol_type = vid_hdr->vol_type; | |
759 | int copy_flag = vid_hdr->copy_flag; | |
3261ebd7 CH |
760 | int vol_id = be32_to_cpu(vid_hdr->vol_id); |
761 | int lnum = be32_to_cpu(vid_hdr->lnum); | |
801c135c | 762 | int compat = vid_hdr->compat; |
3261ebd7 CH |
763 | int data_size = be32_to_cpu(vid_hdr->data_size); |
764 | int used_ebs = be32_to_cpu(vid_hdr->used_ebs); | |
765 | int data_pad = be32_to_cpu(vid_hdr->data_pad); | |
766 | int data_crc = be32_to_cpu(vid_hdr->data_crc); | |
801c135c AB |
767 | int usable_leb_size = ubi->leb_size - data_pad; |
768 | ||
769 | if (copy_flag != 0 && copy_flag != 1) { | |
770 | dbg_err("bad copy_flag"); | |
771 | goto bad; | |
772 | } | |
773 | ||
774 | if (vol_id < 0 || lnum < 0 || data_size < 0 || used_ebs < 0 || | |
775 | data_pad < 0) { | |
776 | dbg_err("negative values"); | |
777 | goto bad; | |
778 | } | |
779 | ||
780 | if (vol_id >= UBI_MAX_VOLUMES && vol_id < UBI_INTERNAL_VOL_START) { | |
781 | dbg_err("bad vol_id"); | |
782 | goto bad; | |
783 | } | |
784 | ||
785 | if (vol_id < UBI_INTERNAL_VOL_START && compat != 0) { | |
786 | dbg_err("bad compat"); | |
787 | goto bad; | |
788 | } | |
789 | ||
790 | if (vol_id >= UBI_INTERNAL_VOL_START && compat != UBI_COMPAT_DELETE && | |
791 | compat != UBI_COMPAT_RO && compat != UBI_COMPAT_PRESERVE && | |
792 | compat != UBI_COMPAT_REJECT) { | |
793 | dbg_err("bad compat"); | |
794 | goto bad; | |
795 | } | |
796 | ||
797 | if (vol_type != UBI_VID_DYNAMIC && vol_type != UBI_VID_STATIC) { | |
798 | dbg_err("bad vol_type"); | |
799 | goto bad; | |
800 | } | |
801 | ||
802 | if (data_pad >= ubi->leb_size / 2) { | |
803 | dbg_err("bad data_pad"); | |
804 | goto bad; | |
805 | } | |
806 | ||
807 | if (vol_type == UBI_VID_STATIC) { | |
808 | /* | |
809 | * Although from high-level point of view static volumes may | |
810 | * contain zero bytes of data, but no VID headers can contain | |
811 | * zero at these fields, because they empty volumes do not have | |
812 | * mapped logical eraseblocks. | |
813 | */ | |
814 | if (used_ebs == 0) { | |
815 | dbg_err("zero used_ebs"); | |
816 | goto bad; | |
817 | } | |
818 | if (data_size == 0) { | |
819 | dbg_err("zero data_size"); | |
820 | goto bad; | |
821 | } | |
822 | if (lnum < used_ebs - 1) { | |
823 | if (data_size != usable_leb_size) { | |
824 | dbg_err("bad data_size"); | |
825 | goto bad; | |
826 | } | |
827 | } else if (lnum == used_ebs - 1) { | |
828 | if (data_size == 0) { | |
829 | dbg_err("bad data_size at last LEB"); | |
830 | goto bad; | |
831 | } | |
832 | } else { | |
833 | dbg_err("too high lnum"); | |
834 | goto bad; | |
835 | } | |
836 | } else { | |
837 | if (copy_flag == 0) { | |
838 | if (data_crc != 0) { | |
839 | dbg_err("non-zero data CRC"); | |
840 | goto bad; | |
841 | } | |
842 | if (data_size != 0) { | |
843 | dbg_err("non-zero data_size"); | |
844 | goto bad; | |
845 | } | |
846 | } else { | |
847 | if (data_size == 0) { | |
848 | dbg_err("zero data_size of copy"); | |
849 | goto bad; | |
850 | } | |
851 | } | |
852 | if (used_ebs != 0) { | |
853 | dbg_err("bad used_ebs"); | |
854 | goto bad; | |
855 | } | |
856 | } | |
857 | ||
858 | return 0; | |
859 | ||
860 | bad: | |
861 | ubi_err("bad VID header"); | |
862 | ubi_dbg_dump_vid_hdr(vid_hdr); | |
863 | ubi_dbg_dump_stack(); | |
864 | return 1; | |
865 | } | |
866 | ||
867 | /** | |
868 | * ubi_io_read_vid_hdr - read and check a volume identifier header. | |
869 | * @ubi: UBI device description object | |
870 | * @pnum: physical eraseblock number to read from | |
871 | * @vid_hdr: &struct ubi_vid_hdr object where to store the read volume | |
872 | * identifier header | |
873 | * @verbose: be verbose if the header is corrupted or wasn't found | |
874 | * | |
875 | * This function reads the volume identifier header from physical eraseblock | |
876 | * @pnum and stores it in @vid_hdr. It also checks CRC checksum of the read | |
877 | * volume identifier header. The following codes may be returned: | |
878 | * | |
879 | * o %0 if the CRC checksum is correct and the header was successfully read; | |
880 | * o %UBI_IO_BITFLIPS if the CRC is correct, but bit-flips were detected | |
881 | * and corrected by the flash driver; this is harmless but may indicate that | |
882 | * this eraseblock may become bad soon; | |
883 | * o %UBI_IO_BAD_VID_HRD if the volume identifier header is corrupted (a CRC | |
884 | * error detected); | |
885 | * o %UBI_IO_PEB_FREE if the physical eraseblock is free (i.e., there is no VID | |
886 | * header there); | |
887 | * o a negative error code in case of failure. | |
888 | */ | |
889 | int ubi_io_read_vid_hdr(const struct ubi_device *ubi, int pnum, | |
890 | struct ubi_vid_hdr *vid_hdr, int verbose) | |
891 | { | |
892 | int err, read_err = 0; | |
893 | uint32_t crc, magic, hdr_crc; | |
894 | void *p; | |
895 | ||
896 | dbg_io("read VID header from PEB %d", pnum); | |
897 | ubi_assert(pnum >= 0 && pnum < ubi->peb_count); | |
898 | ||
899 | p = (char *)vid_hdr - ubi->vid_hdr_shift; | |
900 | err = ubi_io_read(ubi, p, pnum, ubi->vid_hdr_aloffset, | |
901 | ubi->vid_hdr_alsize); | |
902 | if (err) { | |
903 | if (err != UBI_IO_BITFLIPS && err != -EBADMSG) | |
904 | return err; | |
905 | ||
906 | /* | |
907 | * We read all the data, but either a correctable bit-flip | |
908 | * occurred, or MTD reported about some data integrity error, | |
909 | * like an ECC error in case of NAND. The former is harmless, | |
910 | * the later may mean the read data is corrupted. But we have a | |
911 | * CRC check-sum and we will identify this. If the VID header is | |
912 | * still OK, we just report this as there was a bit-flip. | |
913 | */ | |
914 | read_err = err; | |
915 | } | |
916 | ||
3261ebd7 | 917 | magic = be32_to_cpu(vid_hdr->magic); |
801c135c AB |
918 | if (magic != UBI_VID_HDR_MAGIC) { |
919 | /* | |
920 | * If we have read all 0xFF bytes, the VID header probably does | |
921 | * not exist and the physical eraseblock is assumed to be free. | |
922 | * | |
923 | * But if there was a read error, we do not test the data for | |
924 | * 0xFFs. Even if it does contain all 0xFFs, this error | |
925 | * indicates that something is still wrong with this physical | |
926 | * eraseblock and it cannot be regarded as free. | |
927 | */ | |
928 | if (read_err != -EBADMSG && | |
929 | check_pattern(vid_hdr, 0xFF, UBI_VID_HDR_SIZE)) { | |
930 | /* The physical eraseblock is supposedly free */ | |
931 | ||
932 | /* | |
933 | * The below is just a paranoid check, it has to be | |
934 | * compiled out if paranoid checks are disabled. | |
935 | */ | |
936 | err = paranoid_check_all_ff(ubi, pnum, ubi->leb_start, | |
937 | ubi->leb_size); | |
938 | if (err) | |
939 | return err > 0 ? UBI_IO_BAD_VID_HDR : err; | |
940 | ||
941 | if (verbose) | |
942 | ubi_warn("no VID header found at PEB %d, " | |
943 | "only 0xFF bytes", pnum); | |
944 | return UBI_IO_PEB_FREE; | |
945 | } | |
946 | ||
947 | /* | |
948 | * This is not a valid VID header, and these are not 0xFF | |
949 | * bytes. Report that the header is corrupted. | |
950 | */ | |
951 | if (verbose) { | |
952 | ubi_warn("bad magic number at PEB %d: %08x instead of " | |
953 | "%08x", pnum, magic, UBI_VID_HDR_MAGIC); | |
954 | ubi_dbg_dump_vid_hdr(vid_hdr); | |
955 | } | |
956 | return UBI_IO_BAD_VID_HDR; | |
957 | } | |
958 | ||
959 | crc = crc32(UBI_CRC32_INIT, vid_hdr, UBI_VID_HDR_SIZE_CRC); | |
3261ebd7 | 960 | hdr_crc = be32_to_cpu(vid_hdr->hdr_crc); |
801c135c AB |
961 | |
962 | if (hdr_crc != crc) { | |
963 | if (verbose) { | |
964 | ubi_warn("bad CRC at PEB %d, calculated %#08x, " | |
965 | "read %#08x", pnum, crc, hdr_crc); | |
966 | ubi_dbg_dump_vid_hdr(vid_hdr); | |
967 | } | |
968 | return UBI_IO_BAD_VID_HDR; | |
969 | } | |
970 | ||
971 | /* Validate the VID header that we have just read */ | |
972 | err = validate_vid_hdr(ubi, vid_hdr); | |
973 | if (err) { | |
974 | ubi_err("validation failed for PEB %d", pnum); | |
975 | return -EINVAL; | |
976 | } | |
977 | ||
978 | return read_err ? UBI_IO_BITFLIPS : 0; | |
979 | } | |
980 | ||
981 | /** | |
982 | * ubi_io_write_vid_hdr - write a volume identifier header. | |
983 | * @ubi: UBI device description object | |
984 | * @pnum: the physical eraseblock number to write to | |
985 | * @vid_hdr: the volume identifier header to write | |
986 | * | |
987 | * This function writes the volume identifier header described by @vid_hdr to | |
988 | * physical eraseblock @pnum. This function automatically fills the | |
989 | * @vid_hdr->magic and the @vid_hdr->version fields, as well as calculates | |
990 | * header CRC checksum and stores it at vid_hdr->hdr_crc. | |
991 | * | |
992 | * This function returns zero in case of success and a negative error code in | |
993 | * case of failure. If %-EIO is returned, the physical eraseblock probably went | |
994 | * bad. | |
995 | */ | |
996 | int ubi_io_write_vid_hdr(const struct ubi_device *ubi, int pnum, | |
997 | struct ubi_vid_hdr *vid_hdr) | |
998 | { | |
999 | int err; | |
1000 | uint32_t crc; | |
1001 | void *p; | |
1002 | ||
1003 | dbg_io("write VID header to PEB %d", pnum); | |
1004 | ubi_assert(pnum >= 0 && pnum < ubi->peb_count); | |
1005 | ||
1006 | err = paranoid_check_peb_ec_hdr(ubi, pnum); | |
1007 | if (err) | |
1008 | return err > 0 ? -EINVAL: err; | |
1009 | ||
3261ebd7 | 1010 | vid_hdr->magic = cpu_to_be32(UBI_VID_HDR_MAGIC); |
801c135c AB |
1011 | vid_hdr->version = UBI_VERSION; |
1012 | crc = crc32(UBI_CRC32_INIT, vid_hdr, UBI_VID_HDR_SIZE_CRC); | |
3261ebd7 | 1013 | vid_hdr->hdr_crc = cpu_to_be32(crc); |
801c135c AB |
1014 | |
1015 | err = paranoid_check_vid_hdr(ubi, pnum, vid_hdr); | |
1016 | if (err) | |
1017 | return -EINVAL; | |
1018 | ||
1019 | p = (char *)vid_hdr - ubi->vid_hdr_shift; | |
1020 | err = ubi_io_write(ubi, p, pnum, ubi->vid_hdr_aloffset, | |
1021 | ubi->vid_hdr_alsize); | |
1022 | return err; | |
1023 | } | |
1024 | ||
1025 | #ifdef CONFIG_MTD_UBI_DEBUG_PARANOID | |
1026 | ||
1027 | /** | |
1028 | * paranoid_check_not_bad - ensure that a physical eraseblock is not bad. | |
1029 | * @ubi: UBI device description object | |
1030 | * @pnum: physical eraseblock number to check | |
1031 | * | |
1032 | * This function returns zero if the physical eraseblock is good, a positive | |
1033 | * number if it is bad and a negative error code if an error occurred. | |
1034 | */ | |
1035 | static int paranoid_check_not_bad(const struct ubi_device *ubi, int pnum) | |
1036 | { | |
1037 | int err; | |
1038 | ||
1039 | err = ubi_io_is_bad(ubi, pnum); | |
1040 | if (!err) | |
1041 | return err; | |
1042 | ||
1043 | ubi_err("paranoid check failed for PEB %d", pnum); | |
1044 | ubi_dbg_dump_stack(); | |
1045 | return err; | |
1046 | } | |
1047 | ||
1048 | /** | |
1049 | * paranoid_check_ec_hdr - check if an erase counter header is all right. | |
1050 | * @ubi: UBI device description object | |
1051 | * @pnum: physical eraseblock number the erase counter header belongs to | |
1052 | * @ec_hdr: the erase counter header to check | |
1053 | * | |
1054 | * This function returns zero if the erase counter header contains valid | |
1055 | * values, and %1 if not. | |
1056 | */ | |
1057 | static int paranoid_check_ec_hdr(const struct ubi_device *ubi, int pnum, | |
1058 | const struct ubi_ec_hdr *ec_hdr) | |
1059 | { | |
1060 | int err; | |
1061 | uint32_t magic; | |
1062 | ||
3261ebd7 | 1063 | magic = be32_to_cpu(ec_hdr->magic); |
801c135c AB |
1064 | if (magic != UBI_EC_HDR_MAGIC) { |
1065 | ubi_err("bad magic %#08x, must be %#08x", | |
1066 | magic, UBI_EC_HDR_MAGIC); | |
1067 | goto fail; | |
1068 | } | |
1069 | ||
1070 | err = validate_ec_hdr(ubi, ec_hdr); | |
1071 | if (err) { | |
1072 | ubi_err("paranoid check failed for PEB %d", pnum); | |
1073 | goto fail; | |
1074 | } | |
1075 | ||
1076 | return 0; | |
1077 | ||
1078 | fail: | |
1079 | ubi_dbg_dump_ec_hdr(ec_hdr); | |
1080 | ubi_dbg_dump_stack(); | |
1081 | return 1; | |
1082 | } | |
1083 | ||
1084 | /** | |
1085 | * paranoid_check_peb_ec_hdr - check that the erase counter header of a | |
1086 | * physical eraseblock is in-place and is all right. | |
1087 | * @ubi: UBI device description object | |
1088 | * @pnum: the physical eraseblock number to check | |
1089 | * | |
1090 | * This function returns zero if the erase counter header is all right, %1 if | |
1091 | * not, and a negative error code if an error occurred. | |
1092 | */ | |
1093 | static int paranoid_check_peb_ec_hdr(const struct ubi_device *ubi, int pnum) | |
1094 | { | |
1095 | int err; | |
1096 | uint32_t crc, hdr_crc; | |
1097 | struct ubi_ec_hdr *ec_hdr; | |
1098 | ||
1099 | ec_hdr = kzalloc(ubi->ec_hdr_alsize, GFP_KERNEL); | |
1100 | if (!ec_hdr) | |
1101 | return -ENOMEM; | |
1102 | ||
1103 | err = ubi_io_read(ubi, ec_hdr, pnum, 0, UBI_EC_HDR_SIZE); | |
1104 | if (err && err != UBI_IO_BITFLIPS && err != -EBADMSG) | |
1105 | goto exit; | |
1106 | ||
1107 | crc = crc32(UBI_CRC32_INIT, ec_hdr, UBI_EC_HDR_SIZE_CRC); | |
3261ebd7 | 1108 | hdr_crc = be32_to_cpu(ec_hdr->hdr_crc); |
801c135c AB |
1109 | if (hdr_crc != crc) { |
1110 | ubi_err("bad CRC, calculated %#08x, read %#08x", crc, hdr_crc); | |
1111 | ubi_err("paranoid check failed for PEB %d", pnum); | |
1112 | ubi_dbg_dump_ec_hdr(ec_hdr); | |
1113 | ubi_dbg_dump_stack(); | |
1114 | err = 1; | |
1115 | goto exit; | |
1116 | } | |
1117 | ||
1118 | err = paranoid_check_ec_hdr(ubi, pnum, ec_hdr); | |
1119 | ||
1120 | exit: | |
1121 | kfree(ec_hdr); | |
1122 | return err; | |
1123 | } | |
1124 | ||
1125 | /** | |
1126 | * paranoid_check_vid_hdr - check that a volume identifier header is all right. | |
1127 | * @ubi: UBI device description object | |
1128 | * @pnum: physical eraseblock number the volume identifier header belongs to | |
1129 | * @vid_hdr: the volume identifier header to check | |
1130 | * | |
1131 | * This function returns zero if the volume identifier header is all right, and | |
1132 | * %1 if not. | |
1133 | */ | |
1134 | static int paranoid_check_vid_hdr(const struct ubi_device *ubi, int pnum, | |
1135 | const struct ubi_vid_hdr *vid_hdr) | |
1136 | { | |
1137 | int err; | |
1138 | uint32_t magic; | |
1139 | ||
3261ebd7 | 1140 | magic = be32_to_cpu(vid_hdr->magic); |
801c135c AB |
1141 | if (magic != UBI_VID_HDR_MAGIC) { |
1142 | ubi_err("bad VID header magic %#08x at PEB %d, must be %#08x", | |
1143 | magic, pnum, UBI_VID_HDR_MAGIC); | |
1144 | goto fail; | |
1145 | } | |
1146 | ||
1147 | err = validate_vid_hdr(ubi, vid_hdr); | |
1148 | if (err) { | |
1149 | ubi_err("paranoid check failed for PEB %d", pnum); | |
1150 | goto fail; | |
1151 | } | |
1152 | ||
1153 | return err; | |
1154 | ||
1155 | fail: | |
1156 | ubi_err("paranoid check failed for PEB %d", pnum); | |
1157 | ubi_dbg_dump_vid_hdr(vid_hdr); | |
1158 | ubi_dbg_dump_stack(); | |
1159 | return 1; | |
1160 | ||
1161 | } | |
1162 | ||
1163 | /** | |
1164 | * paranoid_check_peb_vid_hdr - check that the volume identifier header of a | |
1165 | * physical eraseblock is in-place and is all right. | |
1166 | * @ubi: UBI device description object | |
1167 | * @pnum: the physical eraseblock number to check | |
1168 | * | |
1169 | * This function returns zero if the volume identifier header is all right, | |
1170 | * %1 if not, and a negative error code if an error occurred. | |
1171 | */ | |
1172 | static int paranoid_check_peb_vid_hdr(const struct ubi_device *ubi, int pnum) | |
1173 | { | |
1174 | int err; | |
1175 | uint32_t crc, hdr_crc; | |
1176 | struct ubi_vid_hdr *vid_hdr; | |
1177 | void *p; | |
1178 | ||
1179 | vid_hdr = ubi_zalloc_vid_hdr(ubi); | |
1180 | if (!vid_hdr) | |
1181 | return -ENOMEM; | |
1182 | ||
1183 | p = (char *)vid_hdr - ubi->vid_hdr_shift; | |
1184 | err = ubi_io_read(ubi, p, pnum, ubi->vid_hdr_aloffset, | |
1185 | ubi->vid_hdr_alsize); | |
1186 | if (err && err != UBI_IO_BITFLIPS && err != -EBADMSG) | |
1187 | goto exit; | |
1188 | ||
1189 | crc = crc32(UBI_CRC32_INIT, vid_hdr, UBI_EC_HDR_SIZE_CRC); | |
3261ebd7 | 1190 | hdr_crc = be32_to_cpu(vid_hdr->hdr_crc); |
801c135c AB |
1191 | if (hdr_crc != crc) { |
1192 | ubi_err("bad VID header CRC at PEB %d, calculated %#08x, " | |
1193 | "read %#08x", pnum, crc, hdr_crc); | |
1194 | ubi_err("paranoid check failed for PEB %d", pnum); | |
1195 | ubi_dbg_dump_vid_hdr(vid_hdr); | |
1196 | ubi_dbg_dump_stack(); | |
1197 | err = 1; | |
1198 | goto exit; | |
1199 | } | |
1200 | ||
1201 | err = paranoid_check_vid_hdr(ubi, pnum, vid_hdr); | |
1202 | ||
1203 | exit: | |
1204 | ubi_free_vid_hdr(ubi, vid_hdr); | |
1205 | return err; | |
1206 | } | |
1207 | ||
1208 | /** | |
1209 | * paranoid_check_all_ff - check that a region of flash is empty. | |
1210 | * @ubi: UBI device description object | |
1211 | * @pnum: the physical eraseblock number to check | |
1212 | * @offset: the starting offset within the physical eraseblock to check | |
1213 | * @len: the length of the region to check | |
1214 | * | |
1215 | * This function returns zero if only 0xFF bytes are present at offset | |
1216 | * @offset of the physical eraseblock @pnum, %1 if not, and a negative error | |
1217 | * code if an error occurred. | |
1218 | */ | |
1219 | static int paranoid_check_all_ff(const struct ubi_device *ubi, int pnum, | |
1220 | int offset, int len) | |
1221 | { | |
1222 | size_t read; | |
1223 | int err; | |
1224 | void *buf; | |
1225 | loff_t addr = (loff_t)pnum * ubi->peb_size + offset; | |
1226 | ||
92ad8f37 | 1227 | buf = vmalloc(len); |
801c135c AB |
1228 | if (!buf) |
1229 | return -ENOMEM; | |
92ad8f37 | 1230 | memset(buf, 0, len); |
801c135c AB |
1231 | |
1232 | err = ubi->mtd->read(ubi->mtd, addr, len, &read, buf); | |
1233 | if (err && err != -EUCLEAN) { | |
1234 | ubi_err("error %d while reading %d bytes from PEB %d:%d, " | |
1235 | "read %zd bytes", err, len, pnum, offset, read); | |
1236 | goto error; | |
1237 | } | |
1238 | ||
1239 | err = check_pattern(buf, 0xFF, len); | |
1240 | if (err == 0) { | |
1241 | ubi_err("flash region at PEB %d:%d, length %d does not " | |
1242 | "contain all 0xFF bytes", pnum, offset, len); | |
1243 | goto fail; | |
1244 | } | |
1245 | ||
92ad8f37 | 1246 | vfree(buf); |
801c135c AB |
1247 | return 0; |
1248 | ||
1249 | fail: | |
1250 | ubi_err("paranoid check failed for PEB %d", pnum); | |
1251 | dbg_msg("hex dump of the %d-%d region", offset, offset + len); | |
1252 | ubi_dbg_hexdump(buf, len); | |
1253 | err = 1; | |
1254 | error: | |
1255 | ubi_dbg_dump_stack(); | |
92ad8f37 | 1256 | vfree(buf); |
801c135c AB |
1257 | return err; |
1258 | } | |
1259 | ||
1260 | #endif /* CONFIG_MTD_UBI_DEBUG_PARANOID */ |