blob: 811775aa8ee80082aa5803a13b3537f2022e5936 [file] [log] [blame]
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +04001/*
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/*
Artem Bityutskiy85c6e6e2008-07-16 10:25:56 +030023 * UBI input/output sub-system.
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +040024 *
Artem Bityutskiy85c6e6e2008-07-16 10:25:56 +030025 * This sub-system provides a uniform way to work with all kinds of the
26 * underlying MTD devices. It also implements handy functions for reading and
27 * writing UBI headers.
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +040028 *
29 * We are trying to have a paranoid mindset and not to trust to what we read
Artem Bityutskiy85c6e6e2008-07-16 10:25:56 +030030 * from the flash media in order to be more secure and robust. So this
31 * sub-system validates every single header it reads from the flash media.
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +040032 *
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
Shinya Kuribayashibe436f62010-05-06 19:22:09 +090067 * bytes which are not relevant to the sub-page are 0xFF. So, basically,
68 * writing 4x512 sub-pages is 4 times slower than writing one 2KiB NAND page.
69 * Thus, we prefer to use sub-pages only for EC and VID headers.
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +040070 *
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 *
Artem Bityutskiy85c6e6e2008-07-16 10:25:56 +030082 * The I/O sub-system does the following trick in order to avoid this extra
83 * copy. It always allocates a @ubi->vid_hdr_alsize bytes buffer for the VID
84 * header and returns a pointer to offset @ubi->vid_hdr_shift of this buffer.
85 * When the VID header is being written out, it shifts the VID header pointer
86 * back and writes the whole sub-page.
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +040087 */
88
89#include <linux/crc32.h>
90#include <linux/err.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090091#include <linux/slab.h>
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +040092#include "ubi.h"
93
94#ifdef CONFIG_MTD_UBI_DEBUG_PARANOID
95static int paranoid_check_not_bad(const struct ubi_device *ubi, int pnum);
96static int paranoid_check_peb_ec_hdr(const struct ubi_device *ubi, int pnum);
97static int paranoid_check_ec_hdr(const struct ubi_device *ubi, int pnum,
98 const struct ubi_ec_hdr *ec_hdr);
99static int paranoid_check_peb_vid_hdr(const struct ubi_device *ubi, int pnum);
100static int paranoid_check_vid_hdr(const struct ubi_device *ubi, int pnum,
101 const struct ubi_vid_hdr *vid_hdr);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400102#else
103#define paranoid_check_not_bad(ubi, pnum) 0
104#define paranoid_check_peb_ec_hdr(ubi, pnum) 0
105#define paranoid_check_ec_hdr(ubi, pnum, ec_hdr) 0
106#define paranoid_check_peb_vid_hdr(ubi, pnum) 0
107#define paranoid_check_vid_hdr(ubi, pnum, vid_hdr) 0
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400108#endif
109
110/**
111 * ubi_io_read - read data from a physical eraseblock.
112 * @ubi: UBI device description object
113 * @buf: buffer where to store the read data
114 * @pnum: physical eraseblock number to read from
115 * @offset: offset within the physical eraseblock from where to read
116 * @len: how many bytes to read
117 *
118 * This function reads data from offset @offset of physical eraseblock @pnum
119 * and stores the read data in the @buf buffer. The following return codes are
120 * possible:
121 *
122 * o %0 if all the requested data were successfully read;
123 * o %UBI_IO_BITFLIPS if all the requested data were successfully read, but
124 * correctable bit-flips were detected; this is harmless but may indicate
125 * that this eraseblock may become bad soon (but do not have to);
Artem Bityutskiy63b6c1e2007-07-17 15:04:20 +0300126 * o %-EBADMSG if the MTD subsystem reported about data integrity problems, for
127 * example it can be an ECC error in case of NAND; this most probably means
128 * that the data is corrupted;
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400129 * o %-EIO if some I/O error occurred;
130 * o other negative error codes in case of other errors.
131 */
132int ubi_io_read(const struct ubi_device *ubi, void *buf, int pnum, int offset,
133 int len)
134{
135 int err, retries = 0;
136 size_t read;
137 loff_t addr;
138
139 dbg_io("read %d bytes from PEB %d:%d", len, pnum, offset);
140
141 ubi_assert(pnum >= 0 && pnum < ubi->peb_count);
142 ubi_assert(offset >= 0 && offset + len <= ubi->peb_size);
143 ubi_assert(len > 0);
144
145 err = paranoid_check_not_bad(ubi, pnum);
146 if (err)
Artem Bityutskiyadbf05e2010-01-20 10:28:58 +0200147 return err;
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400148
149 addr = (loff_t)pnum * ubi->peb_size + offset;
150retry:
151 err = ubi->mtd->read(ubi->mtd, addr, len, &read, buf);
152 if (err) {
Artem Bityutskiyf5d5b1f2010-06-14 08:15:39 +0300153 const char *errstr = (err == -EBADMSG) ? " (ECC error)" : "";
Artem Bityutskiy1a49af22010-06-08 10:59:07 +0300154
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400155 if (err == -EUCLEAN) {
156 /*
157 * -EUCLEAN is reported if there was a bit-flip which
158 * was corrected, so this is harmless.
Artem Bityutskiy8c1e6ee2008-07-18 12:20:23 +0300159 *
160 * We do not report about it here unless debugging is
161 * enabled. A corresponding message will be printed
162 * later, when it is has been scrubbed.
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400163 */
Artem Bityutskiy8c1e6ee2008-07-18 12:20:23 +0300164 dbg_msg("fixable bit-flip detected at PEB %d", pnum);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400165 ubi_assert(len == read);
166 return UBI_IO_BITFLIPS;
167 }
168
169 if (read != len && retries++ < UBI_IO_RETRIES) {
Artem Bityutskiy1a49af22010-06-08 10:59:07 +0300170 dbg_io("error %d%s while reading %d bytes from PEB %d:%d,"
Artem Bityutskiy9c9ec142008-07-18 13:19:52 +0300171 " read only %zd bytes, retry",
Artem Bityutskiy1a49af22010-06-08 10:59:07 +0300172 err, errstr, len, pnum, offset, read);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400173 yield();
174 goto retry;
175 }
176
Artem Bityutskiyf5d5b1f2010-06-14 08:15:39 +0300177 ubi_err("error %d%s while reading %d bytes from PEB %d:%d, "
Artem Bityutskiy1a49af22010-06-08 10:59:07 +0300178 "read %zd bytes", err, errstr, len, pnum, offset, read);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400179 ubi_dbg_dump_stack();
Artem Bityutskiy2362a532007-10-18 20:09:41 +0300180
181 /*
182 * The driver should never return -EBADMSG if it failed to read
183 * all the requested data. But some buggy drivers might do
184 * this, so we change it to -EIO.
185 */
186 if (read != len && err == -EBADMSG) {
187 ubi_assert(0);
188 err = -EIO;
189 }
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400190 } else {
191 ubi_assert(len == read);
192
193 if (ubi_dbg_is_bitflip()) {
Artem Bityutskiyc8566352008-07-16 17:40:22 +0300194 dbg_gen("bit-flip (emulated)");
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400195 err = UBI_IO_BITFLIPS;
196 }
197 }
198
199 return err;
200}
201
202/**
203 * ubi_io_write - write data to a physical eraseblock.
204 * @ubi: UBI device description object
205 * @buf: buffer with the data to write
206 * @pnum: physical eraseblock number to write to
207 * @offset: offset within the physical eraseblock where to write
208 * @len: how many bytes to write
209 *
210 * This function writes @len bytes of data from buffer @buf to offset @offset
211 * of physical eraseblock @pnum. If all the data were successfully written,
212 * zero is returned. If an error occurred, this function returns a negative
213 * error code. If %-EIO is returned, the physical eraseblock most probably went
214 * bad.
215 *
216 * Note, in case of an error, it is possible that something was still written
217 * to the flash media, but may be some garbage.
218 */
Artem Bityutskiye88d6e102007-08-29 14:51:52 +0300219int ubi_io_write(struct ubi_device *ubi, const void *buf, int pnum, int offset,
220 int len)
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400221{
222 int err;
223 size_t written;
224 loff_t addr;
225
226 dbg_io("write %d bytes to PEB %d:%d", len, pnum, offset);
227
228 ubi_assert(pnum >= 0 && pnum < ubi->peb_count);
229 ubi_assert(offset >= 0 && offset + len <= ubi->peb_size);
230 ubi_assert(offset % ubi->hdrs_min_io_size == 0);
231 ubi_assert(len > 0 && len % ubi->hdrs_min_io_size == 0);
232
233 if (ubi->ro_mode) {
234 ubi_err("read-only mode");
235 return -EROFS;
236 }
237
238 /* The below has to be compiled out if paranoid checks are disabled */
239
240 err = paranoid_check_not_bad(ubi, pnum);
241 if (err)
Artem Bityutskiyadbf05e2010-01-20 10:28:58 +0200242 return err;
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400243
244 /* The area we are writing to has to contain all 0xFF bytes */
Artem Bityutskiy40a71a82009-06-28 19:16:55 +0300245 err = ubi_dbg_check_all_ff(ubi, pnum, offset, len);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400246 if (err)
Artem Bityutskiyadbf05e2010-01-20 10:28:58 +0200247 return err;
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400248
249 if (offset >= ubi->leb_start) {
250 /*
251 * We write to the data area of the physical eraseblock. Make
252 * sure it has valid EC and VID headers.
253 */
254 err = paranoid_check_peb_ec_hdr(ubi, pnum);
255 if (err)
Artem Bityutskiyadbf05e2010-01-20 10:28:58 +0200256 return err;
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400257 err = paranoid_check_peb_vid_hdr(ubi, pnum);
258 if (err)
Artem Bityutskiyadbf05e2010-01-20 10:28:58 +0200259 return err;
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400260 }
261
262 if (ubi_dbg_is_write_failure()) {
263 dbg_err("cannot write %d bytes to PEB %d:%d "
264 "(emulated)", len, pnum, offset);
265 ubi_dbg_dump_stack();
266 return -EIO;
267 }
268
269 addr = (loff_t)pnum * ubi->peb_size + offset;
270 err = ubi->mtd->write(ubi->mtd, addr, len, &written, buf);
271 if (err) {
Artem Bityutskiyebf53f42009-07-06 08:57:53 +0300272 ubi_err("error %d while writing %d bytes to PEB %d:%d, written "
273 "%zd bytes", err, len, pnum, offset, written);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400274 ubi_dbg_dump_stack();
Artem Bityutskiy867996b2009-07-24 15:31:33 +0300275 ubi_dbg_dump_flash(ubi, pnum, offset, len);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400276 } else
277 ubi_assert(written == len);
278
Artem Bityutskiy6e9065d2010-01-25 17:09:30 +0200279 if (!err) {
280 err = ubi_dbg_check_write(ubi, buf, pnum, offset, len);
281 if (err)
282 return err;
283
284 /*
285 * Since we always write sequentially, the rest of the PEB has
286 * to contain only 0xFF bytes.
287 */
288 offset += len;
289 len = ubi->peb_size - offset;
290 if (len)
291 err = ubi_dbg_check_all_ff(ubi, pnum, offset, len);
292 }
293
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400294 return err;
295}
296
297/**
298 * erase_callback - MTD erasure call-back.
299 * @ei: MTD erase information object.
300 *
301 * Note, even though MTD erase interface is asynchronous, all the current
302 * implementations are synchronous anyway.
303 */
304static void erase_callback(struct erase_info *ei)
305{
306 wake_up_interruptible((wait_queue_head_t *)ei->priv);
307}
308
309/**
310 * do_sync_erase - synchronously erase a physical eraseblock.
311 * @ubi: UBI device description object
312 * @pnum: the physical eraseblock number to erase
313 *
314 * This function synchronously erases physical eraseblock @pnum and returns
315 * zero in case of success and a negative error code in case of failure. If
316 * %-EIO is returned, the physical eraseblock most probably went bad.
317 */
Artem Bityutskiye88d6e102007-08-29 14:51:52 +0300318static int do_sync_erase(struct ubi_device *ubi, int pnum)
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400319{
320 int err, retries = 0;
321 struct erase_info ei;
322 wait_queue_head_t wq;
323
324 dbg_io("erase PEB %d", pnum);
325
326retry:
327 init_waitqueue_head(&wq);
328 memset(&ei, 0, sizeof(struct erase_info));
329
330 ei.mtd = ubi->mtd;
Brijesh Singh2f176f72007-07-05 15:07:35 +0530331 ei.addr = (loff_t)pnum * ubi->peb_size;
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400332 ei.len = ubi->peb_size;
333 ei.callback = erase_callback;
334 ei.priv = (unsigned long)&wq;
335
336 err = ubi->mtd->erase(ubi->mtd, &ei);
337 if (err) {
338 if (retries++ < UBI_IO_RETRIES) {
339 dbg_io("error %d while erasing PEB %d, retry",
340 err, pnum);
341 yield();
342 goto retry;
343 }
344 ubi_err("cannot erase PEB %d, error %d", pnum, err);
345 ubi_dbg_dump_stack();
346 return err;
347 }
348
349 err = wait_event_interruptible(wq, ei.state == MTD_ERASE_DONE ||
350 ei.state == MTD_ERASE_FAILED);
351 if (err) {
352 ubi_err("interrupted PEB %d erasure", pnum);
353 return -EINTR;
354 }
355
356 if (ei.state == MTD_ERASE_FAILED) {
357 if (retries++ < UBI_IO_RETRIES) {
358 dbg_io("error while erasing PEB %d, retry", pnum);
359 yield();
360 goto retry;
361 }
362 ubi_err("cannot erase PEB %d", pnum);
363 ubi_dbg_dump_stack();
364 return -EIO;
365 }
366
Artem Bityutskiy40a71a82009-06-28 19:16:55 +0300367 err = ubi_dbg_check_all_ff(ubi, pnum, 0, ubi->peb_size);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400368 if (err)
Artem Bityutskiyadbf05e2010-01-20 10:28:58 +0200369 return err;
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400370
371 if (ubi_dbg_is_erase_failure() && !err) {
372 dbg_err("cannot erase PEB %d (emulated)", pnum);
373 return -EIO;
374 }
375
376 return 0;
377}
378
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400379/* Patterns to write to a physical eraseblock when torturing it */
380static uint8_t patterns[] = {0xa5, 0x5a, 0x0};
381
382/**
383 * torture_peb - test a supposedly bad physical eraseblock.
384 * @ubi: UBI device description object
385 * @pnum: the physical eraseblock number to test
386 *
387 * This function returns %-EIO if the physical eraseblock did not pass the
388 * test, a positive number of erase operations done if the test was
389 * successfully passed, and other negative error codes in case of other errors.
390 */
Artem Bityutskiye88d6e102007-08-29 14:51:52 +0300391static int torture_peb(struct ubi_device *ubi, int pnum)
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400392{
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400393 int err, i, patt_count;
394
Artem Bityutskiy8c1e6ee2008-07-18 12:20:23 +0300395 ubi_msg("run torture test for PEB %d", pnum);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400396 patt_count = ARRAY_SIZE(patterns);
397 ubi_assert(patt_count > 0);
398
Artem Bityutskiye88d6e102007-08-29 14:51:52 +0300399 mutex_lock(&ubi->buf_mutex);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400400 for (i = 0; i < patt_count; i++) {
401 err = do_sync_erase(ubi, pnum);
402 if (err)
403 goto out;
404
405 /* Make sure the PEB contains only 0xFF bytes */
Artem Bityutskiye88d6e102007-08-29 14:51:52 +0300406 err = ubi_io_read(ubi, ubi->peb_buf1, pnum, 0, ubi->peb_size);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400407 if (err)
408 goto out;
409
Artem Bityutskiybb00e182010-07-31 09:37:34 +0300410 err = ubi_check_pattern(ubi->peb_buf1, 0xFF, ubi->peb_size);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400411 if (err == 0) {
412 ubi_err("erased PEB %d, but a non-0xFF byte found",
413 pnum);
414 err = -EIO;
415 goto out;
416 }
417
418 /* Write a pattern and check it */
Artem Bityutskiye88d6e102007-08-29 14:51:52 +0300419 memset(ubi->peb_buf1, patterns[i], ubi->peb_size);
420 err = ubi_io_write(ubi, ubi->peb_buf1, pnum, 0, ubi->peb_size);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400421 if (err)
422 goto out;
423
Artem Bityutskiye88d6e102007-08-29 14:51:52 +0300424 memset(ubi->peb_buf1, ~patterns[i], ubi->peb_size);
425 err = ubi_io_read(ubi, ubi->peb_buf1, pnum, 0, ubi->peb_size);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400426 if (err)
427 goto out;
428
Artem Bityutskiybb00e182010-07-31 09:37:34 +0300429 err = ubi_check_pattern(ubi->peb_buf1, patterns[i],
430 ubi->peb_size);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400431 if (err == 0) {
432 ubi_err("pattern %x checking failed for PEB %d",
433 patterns[i], pnum);
434 err = -EIO;
435 goto out;
436 }
437 }
438
439 err = patt_count;
Artem Bityutskiy8c1e6ee2008-07-18 12:20:23 +0300440 ubi_msg("PEB %d passed torture test, do not mark it a bad", pnum);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400441
442out:
Artem Bityutskiye88d6e102007-08-29 14:51:52 +0300443 mutex_unlock(&ubi->buf_mutex);
Artem Bityutskiy8d2d4012007-07-22 22:32:51 +0300444 if (err == UBI_IO_BITFLIPS || err == -EBADMSG) {
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400445 /*
446 * If a bit-flip or data integrity error was detected, the test
447 * has not passed because it happened on a freshly erased
448 * physical eraseblock which means something is wrong with it.
449 */
Artem Bityutskiy8d2d4012007-07-22 22:32:51 +0300450 ubi_err("read problems on freshly erased PEB %d, must be bad",
451 pnum);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400452 err = -EIO;
Artem Bityutskiy8d2d4012007-07-22 22:32:51 +0300453 }
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400454 return err;
455}
456
457/**
Artem Bityutskiyebf53f42009-07-06 08:57:53 +0300458 * nor_erase_prepare - prepare a NOR flash PEB for erasure.
459 * @ubi: UBI device description object
460 * @pnum: physical eraseblock number to prepare
461 *
462 * NOR flash, or at least some of them, have peculiar embedded PEB erasure
463 * algorithm: the PEB is first filled with zeroes, then it is erased. And
464 * filling with zeroes starts from the end of the PEB. This was observed with
465 * Spansion S29GL512N NOR flash.
466 *
467 * This means that in case of a power cut we may end up with intact data at the
468 * beginning of the PEB, and all zeroes at the end of PEB. In other words, the
469 * EC and VID headers are OK, but a large chunk of data at the end of PEB is
470 * zeroed. This makes UBI mistakenly treat this PEB as used and associate it
471 * with an LEB, which leads to subsequent failures (e.g., UBIFS fails).
472 *
473 * This function is called before erasing NOR PEBs and it zeroes out EC and VID
474 * magic numbers in order to invalidate them and prevent the failures. Returns
475 * zero in case of success and a negative error code in case of failure.
476 */
477static int nor_erase_prepare(struct ubi_device *ubi, int pnum)
478{
Artem Bityutskiyde75c772009-07-24 16:18:04 +0300479 int err, err1;
Artem Bityutskiyebf53f42009-07-06 08:57:53 +0300480 size_t written;
481 loff_t addr;
482 uint32_t data = 0;
Artem Bityutskiyde75c772009-07-24 16:18:04 +0300483 struct ubi_vid_hdr vid_hdr;
Artem Bityutskiyebf53f42009-07-06 08:57:53 +0300484
Artem Bityutskiy7ac760c2010-12-02 06:34:01 +0200485 /*
486 * It is important to first invalidate the EC header, and then the VID
487 * header. Otherwise a power cut may lead to valid EC header and
488 * invalid VID header, in which case UBI will treat this PEB as
489 * corrupted and will try to preserve it, and print scary warnings (see
490 * the header comment in scan.c for more information).
491 */
492 addr = (loff_t)pnum * ubi->peb_size;
Artem Bityutskiy83c20992009-07-08 10:15:41 +0300493 err = ubi->mtd->write(ubi->mtd, addr, 4, &written, (void *)&data);
Artem Bityutskiyde75c772009-07-24 16:18:04 +0300494 if (!err) {
Artem Bityutskiy7ac760c2010-12-02 06:34:01 +0200495 addr += ubi->vid_hdr_aloffset;
Artem Bityutskiyde75c772009-07-24 16:18:04 +0300496 err = ubi->mtd->write(ubi->mtd, addr, 4, &written,
497 (void *)&data);
498 if (!err)
499 return 0;
Artem Bityutskiyebf53f42009-07-06 08:57:53 +0300500 }
501
Artem Bityutskiyde75c772009-07-24 16:18:04 +0300502 /*
503 * We failed to write to the media. This was observed with Spansion
Artem Bityutskiy7ac760c2010-12-02 06:34:01 +0200504 * S29GL512N NOR flash. Most probably the previously eraseblock erasure
505 * was interrupted at a very inappropriate moment, so it became
506 * unwritable. In this case we probably anyway have garbage in this
507 * PEB.
Artem Bityutskiyde75c772009-07-24 16:18:04 +0300508 */
509 err1 = ubi_io_read_vid_hdr(ubi, pnum, &vid_hdr, 0);
Artem Bityutskiy7ac760c2010-12-02 06:34:01 +0200510 if (err1 == UBI_IO_BAD_HDR_EBADMSG || err1 == UBI_IO_BAD_HDR) {
511 struct ubi_ec_hdr ec_hdr;
512
513 err1 = ubi_io_read_ec_hdr(ubi, pnum, &ec_hdr, 0);
514 if (err1 == UBI_IO_BAD_HDR_EBADMSG || err1 == UBI_IO_BAD_HDR)
515 /*
516 * Both VID and EC headers are corrupted, so we can
517 * safely erase this PEB and not afraid that it will be
518 * treated as a valid PEB in case of an unclean reboot.
519 */
520 return 0;
521 }
Artem Bityutskiy5b289b52009-07-19 14:09:46 +0300522
Artem Bityutskiyde75c772009-07-24 16:18:04 +0300523 /*
524 * The PEB contains a valid VID header, but we cannot invalidate it.
525 * Supposedly the flash media or the driver is screwed up, so return an
526 * error.
527 */
528 ubi_err("cannot invalidate PEB %d, write returned %d read returned %d",
529 pnum, err, err1);
530 ubi_dbg_dump_flash(ubi, pnum, 0, ubi->peb_size);
531 return -EIO;
Artem Bityutskiyebf53f42009-07-06 08:57:53 +0300532}
533
534/**
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400535 * ubi_io_sync_erase - synchronously erase a physical eraseblock.
536 * @ubi: UBI device description object
537 * @pnum: physical eraseblock number to erase
538 * @torture: if this physical eraseblock has to be tortured
539 *
540 * This function synchronously erases physical eraseblock @pnum. If @torture
541 * flag is not zero, the physical eraseblock is checked by means of writing
542 * different patterns to it and reading them back. If the torturing is enabled,
Frederik Schwarzer025dfda2008-10-16 19:02:37 +0200543 * the physical eraseblock is erased more than once.
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400544 *
545 * This function returns the number of erasures made in case of success, %-EIO
546 * if the erasure failed or the torturing test failed, and other negative error
547 * codes in case of other errors. Note, %-EIO means that the physical
548 * eraseblock is bad.
549 */
Artem Bityutskiye88d6e102007-08-29 14:51:52 +0300550int ubi_io_sync_erase(struct ubi_device *ubi, int pnum, int torture)
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400551{
552 int err, ret = 0;
553
554 ubi_assert(pnum >= 0 && pnum < ubi->peb_count);
555
556 err = paranoid_check_not_bad(ubi, pnum);
557 if (err != 0)
Artem Bityutskiyadbf05e2010-01-20 10:28:58 +0200558 return err;
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400559
560 if (ubi->ro_mode) {
561 ubi_err("read-only mode");
562 return -EROFS;
563 }
564
Artem Bityutskiyebf53f42009-07-06 08:57:53 +0300565 if (ubi->nor_flash) {
566 err = nor_erase_prepare(ubi, pnum);
567 if (err)
568 return err;
569 }
570
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400571 if (torture) {
572 ret = torture_peb(ubi, pnum);
573 if (ret < 0)
574 return ret;
575 }
576
577 err = do_sync_erase(ubi, pnum);
578 if (err)
579 return err;
580
581 return ret + 1;
582}
583
584/**
585 * ubi_io_is_bad - check if a physical eraseblock is bad.
586 * @ubi: UBI device description object
587 * @pnum: the physical eraseblock number to check
588 *
589 * This function returns a positive number if the physical eraseblock is bad,
590 * zero if not, and a negative error code if an error occurred.
591 */
592int ubi_io_is_bad(const struct ubi_device *ubi, int pnum)
593{
594 struct mtd_info *mtd = ubi->mtd;
595
596 ubi_assert(pnum >= 0 && pnum < ubi->peb_count);
597
598 if (ubi->bad_allowed) {
599 int ret;
600
601 ret = mtd->block_isbad(mtd, (loff_t)pnum * ubi->peb_size);
602 if (ret < 0)
603 ubi_err("error %d while checking if PEB %d is bad",
604 ret, pnum);
605 else if (ret)
606 dbg_io("PEB %d is bad", pnum);
607 return ret;
608 }
609
610 return 0;
611}
612
613/**
614 * ubi_io_mark_bad - mark a physical eraseblock as bad.
615 * @ubi: UBI device description object
616 * @pnum: the physical eraseblock number to mark
617 *
618 * This function returns zero in case of success and a negative error code in
619 * case of failure.
620 */
621int ubi_io_mark_bad(const struct ubi_device *ubi, int pnum)
622{
623 int err;
624 struct mtd_info *mtd = ubi->mtd;
625
626 ubi_assert(pnum >= 0 && pnum < ubi->peb_count);
627
628 if (ubi->ro_mode) {
629 ubi_err("read-only mode");
630 return -EROFS;
631 }
632
633 if (!ubi->bad_allowed)
634 return 0;
635
636 err = mtd->block_markbad(mtd, (loff_t)pnum * ubi->peb_size);
637 if (err)
638 ubi_err("cannot mark PEB %d bad, error %d", pnum, err);
639 return err;
640}
641
642/**
643 * validate_ec_hdr - validate an erase counter header.
644 * @ubi: UBI device description object
645 * @ec_hdr: the erase counter header to check
646 *
647 * This function returns zero if the erase counter header is OK, and %1 if
648 * not.
649 */
Artem Bityutskiyfe96efc2009-06-30 16:11:59 +0300650static int validate_ec_hdr(const struct ubi_device *ubi,
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400651 const struct ubi_ec_hdr *ec_hdr)
652{
653 long long ec;
Artem Bityutskiyfe96efc2009-06-30 16:11:59 +0300654 int vid_hdr_offset, leb_start;
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400655
Christoph Hellwig3261ebd2007-05-21 17:41:46 +0300656 ec = be64_to_cpu(ec_hdr->ec);
657 vid_hdr_offset = be32_to_cpu(ec_hdr->vid_hdr_offset);
658 leb_start = be32_to_cpu(ec_hdr->data_offset);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400659
660 if (ec_hdr->version != UBI_VERSION) {
661 ubi_err("node with incompatible UBI version found: "
662 "this UBI version is %d, image version is %d",
663 UBI_VERSION, (int)ec_hdr->version);
664 goto bad;
665 }
666
667 if (vid_hdr_offset != ubi->vid_hdr_offset) {
668 ubi_err("bad VID header offset %d, expected %d",
669 vid_hdr_offset, ubi->vid_hdr_offset);
670 goto bad;
671 }
672
673 if (leb_start != ubi->leb_start) {
674 ubi_err("bad data offset %d, expected %d",
675 leb_start, ubi->leb_start);
676 goto bad;
677 }
678
679 if (ec < 0 || ec > UBI_MAX_ERASECOUNTER) {
680 ubi_err("bad erase counter %lld", ec);
681 goto bad;
682 }
683
684 return 0;
685
686bad:
687 ubi_err("bad EC header");
688 ubi_dbg_dump_ec_hdr(ec_hdr);
689 ubi_dbg_dump_stack();
690 return 1;
691}
692
693/**
694 * ubi_io_read_ec_hdr - read and check an erase counter header.
695 * @ubi: UBI device description object
696 * @pnum: physical eraseblock to read from
697 * @ec_hdr: a &struct ubi_ec_hdr object where to store the read erase counter
698 * header
699 * @verbose: be verbose if the header is corrupted or was not found
700 *
701 * This function reads erase counter header from physical eraseblock @pnum and
702 * stores it in @ec_hdr. This function also checks CRC checksum of the read
703 * erase counter header. The following codes may be returned:
704 *
705 * o %0 if the CRC checksum is correct and the header was successfully read;
706 * o %UBI_IO_BITFLIPS if the CRC is correct, but bit-flips were detected
707 * and corrected by the flash driver; this is harmless but may indicate that
708 * this eraseblock may become bad soon (but may be not);
Artem Bityutskiy786d7832010-04-30 16:50:22 +0300709 * o %UBI_IO_BAD_HDR if the erase counter header is corrupted (a CRC error);
Artem Bityutskiy756e1df2010-09-03 01:30:16 +0300710 * o %UBI_IO_BAD_HDR_EBADMSG is the same as %UBI_IO_BAD_HDR, but there also was
711 * a data integrity error (uncorrectable ECC error in case of NAND);
Artem Bityutskiy74d82d22010-09-03 02:11:20 +0300712 * o %UBI_IO_FF if only 0xFF bytes were read (the PEB is supposedly empty)
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400713 * o a negative error code in case of failure.
714 */
Artem Bityutskiye88d6e102007-08-29 14:51:52 +0300715int ubi_io_read_ec_hdr(struct ubi_device *ubi, int pnum,
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400716 struct ubi_ec_hdr *ec_hdr, int verbose)
717{
Artem Bityutskiy92e1a7d2010-09-03 14:22:17 +0300718 int err, read_err;
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400719 uint32_t crc, magic, hdr_crc;
720
721 dbg_io("read EC header from PEB %d", pnum);
722 ubi_assert(pnum >= 0 && pnum < ubi->peb_count);
723
Artem Bityutskiy92e1a7d2010-09-03 14:22:17 +0300724 read_err = ubi_io_read(ubi, ec_hdr, pnum, 0, UBI_EC_HDR_SIZE);
725 if (read_err) {
726 if (read_err != UBI_IO_BITFLIPS && read_err != -EBADMSG)
727 return read_err;
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400728
729 /*
730 * We read all the data, but either a correctable bit-flip
Artem Bityutskiy756e1df2010-09-03 01:30:16 +0300731 * occurred, or MTD reported a data integrity error
732 * (uncorrectable ECC error in case of NAND). The former is
733 * harmless, the later may mean that the read data is
734 * corrupted. But we have a CRC check-sum and we will detect
735 * this. If the EC header is still OK, we just report this as
736 * there was a bit-flip, to force scrubbing.
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400737 */
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400738 }
739
Christoph Hellwig3261ebd2007-05-21 17:41:46 +0300740 magic = be32_to_cpu(ec_hdr->magic);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400741 if (magic != UBI_EC_HDR_MAGIC) {
Artem Bityutskiy92e1a7d2010-09-03 14:22:17 +0300742 if (read_err == -EBADMSG)
743 return UBI_IO_BAD_HDR_EBADMSG;
Artem Bityutskiyeb895802010-05-03 09:04:39 +0300744
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400745 /*
746 * The magic field is wrong. Let's check if we have read all
747 * 0xFF. If yes, this physical eraseblock is assumed to be
748 * empty.
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400749 */
Artem Bityutskiybb00e182010-07-31 09:37:34 +0300750 if (ubi_check_pattern(ec_hdr, 0xFF, UBI_EC_HDR_SIZE)) {
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400751 /* The physical eraseblock is supposedly empty */
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400752 if (verbose)
753 ubi_warn("no EC header found at PEB %d, "
754 "only 0xFF bytes", pnum);
Artem Bityutskiyed458192008-11-12 10:14:10 +0200755 else if (UBI_IO_DEBUG)
756 dbg_msg("no EC header found at PEB %d, "
757 "only 0xFF bytes", pnum);
Artem Bityutskiy92e1a7d2010-09-03 14:22:17 +0300758 if (!read_err)
759 return UBI_IO_FF;
760 else
761 return UBI_IO_FF_BITFLIPS;
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400762 }
763
764 /*
765 * This is not a valid erase counter header, and these are not
766 * 0xFF bytes. Report that the header is corrupted.
767 */
768 if (verbose) {
769 ubi_warn("bad magic number at PEB %d: %08x instead of "
770 "%08x", pnum, magic, UBI_EC_HDR_MAGIC);
771 ubi_dbg_dump_ec_hdr(ec_hdr);
Artem Bityutskiyed458192008-11-12 10:14:10 +0200772 } else if (UBI_IO_DEBUG)
773 dbg_msg("bad magic number at PEB %d: %08x instead of "
774 "%08x", pnum, magic, UBI_EC_HDR_MAGIC);
Artem Bityutskiy786d7832010-04-30 16:50:22 +0300775 return UBI_IO_BAD_HDR;
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400776 }
777
778 crc = crc32(UBI_CRC32_INIT, ec_hdr, UBI_EC_HDR_SIZE_CRC);
Christoph Hellwig3261ebd2007-05-21 17:41:46 +0300779 hdr_crc = be32_to_cpu(ec_hdr->hdr_crc);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400780
781 if (hdr_crc != crc) {
782 if (verbose) {
Artem Bityutskiy9c9ec142008-07-18 13:19:52 +0300783 ubi_warn("bad EC header CRC at PEB %d, calculated "
784 "%#08x, read %#08x", pnum, crc, hdr_crc);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400785 ubi_dbg_dump_ec_hdr(ec_hdr);
Artem Bityutskiyed458192008-11-12 10:14:10 +0200786 } else if (UBI_IO_DEBUG)
787 dbg_msg("bad EC header CRC at PEB %d, calculated "
788 "%#08x, read %#08x", pnum, crc, hdr_crc);
Artem Bityutskiy92e1a7d2010-09-03 14:22:17 +0300789
790 if (!read_err)
791 return UBI_IO_BAD_HDR;
792 else
793 return UBI_IO_BAD_HDR_EBADMSG;
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400794 }
795
796 /* And of course validate what has just been read from the media */
797 err = validate_ec_hdr(ubi, ec_hdr);
798 if (err) {
799 ubi_err("validation failed for PEB %d", pnum);
800 return -EINVAL;
801 }
802
Artem Bityutskiyeb895802010-05-03 09:04:39 +0300803 /*
804 * If there was %-EBADMSG, but the header CRC is still OK, report about
805 * a bit-flip to force scrubbing on this PEB.
806 */
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400807 return read_err ? UBI_IO_BITFLIPS : 0;
808}
809
810/**
811 * ubi_io_write_ec_hdr - write an erase counter header.
812 * @ubi: UBI device description object
813 * @pnum: physical eraseblock to write to
814 * @ec_hdr: the erase counter header to write
815 *
816 * This function writes erase counter header described by @ec_hdr to physical
817 * eraseblock @pnum. It also fills most fields of @ec_hdr before writing, so
818 * the caller do not have to fill them. Callers must only fill the @ec_hdr->ec
819 * field.
820 *
821 * This function returns zero in case of success and a negative error code in
822 * case of failure. If %-EIO is returned, the physical eraseblock most probably
823 * went bad.
824 */
Artem Bityutskiye88d6e102007-08-29 14:51:52 +0300825int ubi_io_write_ec_hdr(struct ubi_device *ubi, int pnum,
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400826 struct ubi_ec_hdr *ec_hdr)
827{
828 int err;
829 uint32_t crc;
830
831 dbg_io("write EC header to PEB %d", pnum);
832 ubi_assert(pnum >= 0 && pnum < ubi->peb_count);
833
Christoph Hellwig3261ebd2007-05-21 17:41:46 +0300834 ec_hdr->magic = cpu_to_be32(UBI_EC_HDR_MAGIC);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400835 ec_hdr->version = UBI_VERSION;
Christoph Hellwig3261ebd2007-05-21 17:41:46 +0300836 ec_hdr->vid_hdr_offset = cpu_to_be32(ubi->vid_hdr_offset);
837 ec_hdr->data_offset = cpu_to_be32(ubi->leb_start);
Adrian Hunter0c6c7fa2009-06-26 14:58:01 +0300838 ec_hdr->image_seq = cpu_to_be32(ubi->image_seq);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400839 crc = crc32(UBI_CRC32_INIT, ec_hdr, UBI_EC_HDR_SIZE_CRC);
Christoph Hellwig3261ebd2007-05-21 17:41:46 +0300840 ec_hdr->hdr_crc = cpu_to_be32(crc);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400841
842 err = paranoid_check_ec_hdr(ubi, pnum, ec_hdr);
843 if (err)
Artem Bityutskiyadbf05e2010-01-20 10:28:58 +0200844 return err;
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400845
846 err = ubi_io_write(ubi, ec_hdr, pnum, 0, ubi->ec_hdr_alsize);
847 return err;
848}
849
850/**
851 * validate_vid_hdr - validate a volume identifier header.
852 * @ubi: UBI device description object
853 * @vid_hdr: the volume identifier header to check
854 *
855 * This function checks that data stored in the volume identifier header
856 * @vid_hdr. Returns zero if the VID header is OK and %1 if not.
857 */
858static int validate_vid_hdr(const struct ubi_device *ubi,
859 const struct ubi_vid_hdr *vid_hdr)
860{
861 int vol_type = vid_hdr->vol_type;
862 int copy_flag = vid_hdr->copy_flag;
Christoph Hellwig3261ebd2007-05-21 17:41:46 +0300863 int vol_id = be32_to_cpu(vid_hdr->vol_id);
864 int lnum = be32_to_cpu(vid_hdr->lnum);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400865 int compat = vid_hdr->compat;
Christoph Hellwig3261ebd2007-05-21 17:41:46 +0300866 int data_size = be32_to_cpu(vid_hdr->data_size);
867 int used_ebs = be32_to_cpu(vid_hdr->used_ebs);
868 int data_pad = be32_to_cpu(vid_hdr->data_pad);
869 int data_crc = be32_to_cpu(vid_hdr->data_crc);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400870 int usable_leb_size = ubi->leb_size - data_pad;
871
872 if (copy_flag != 0 && copy_flag != 1) {
873 dbg_err("bad copy_flag");
874 goto bad;
875 }
876
877 if (vol_id < 0 || lnum < 0 || data_size < 0 || used_ebs < 0 ||
878 data_pad < 0) {
879 dbg_err("negative values");
880 goto bad;
881 }
882
883 if (vol_id >= UBI_MAX_VOLUMES && vol_id < UBI_INTERNAL_VOL_START) {
884 dbg_err("bad vol_id");
885 goto bad;
886 }
887
888 if (vol_id < UBI_INTERNAL_VOL_START && compat != 0) {
889 dbg_err("bad compat");
890 goto bad;
891 }
892
893 if (vol_id >= UBI_INTERNAL_VOL_START && compat != UBI_COMPAT_DELETE &&
894 compat != UBI_COMPAT_RO && compat != UBI_COMPAT_PRESERVE &&
895 compat != UBI_COMPAT_REJECT) {
896 dbg_err("bad compat");
897 goto bad;
898 }
899
900 if (vol_type != UBI_VID_DYNAMIC && vol_type != UBI_VID_STATIC) {
901 dbg_err("bad vol_type");
902 goto bad;
903 }
904
905 if (data_pad >= ubi->leb_size / 2) {
906 dbg_err("bad data_pad");
907 goto bad;
908 }
909
910 if (vol_type == UBI_VID_STATIC) {
911 /*
912 * Although from high-level point of view static volumes may
913 * contain zero bytes of data, but no VID headers can contain
914 * zero at these fields, because they empty volumes do not have
915 * mapped logical eraseblocks.
916 */
917 if (used_ebs == 0) {
918 dbg_err("zero used_ebs");
919 goto bad;
920 }
921 if (data_size == 0) {
922 dbg_err("zero data_size");
923 goto bad;
924 }
925 if (lnum < used_ebs - 1) {
926 if (data_size != usable_leb_size) {
927 dbg_err("bad data_size");
928 goto bad;
929 }
930 } else if (lnum == used_ebs - 1) {
931 if (data_size == 0) {
932 dbg_err("bad data_size at last LEB");
933 goto bad;
934 }
935 } else {
936 dbg_err("too high lnum");
937 goto bad;
938 }
939 } else {
940 if (copy_flag == 0) {
941 if (data_crc != 0) {
942 dbg_err("non-zero data CRC");
943 goto bad;
944 }
945 if (data_size != 0) {
946 dbg_err("non-zero data_size");
947 goto bad;
948 }
949 } else {
950 if (data_size == 0) {
951 dbg_err("zero data_size of copy");
952 goto bad;
953 }
954 }
955 if (used_ebs != 0) {
956 dbg_err("bad used_ebs");
957 goto bad;
958 }
959 }
960
961 return 0;
962
963bad:
964 ubi_err("bad VID header");
965 ubi_dbg_dump_vid_hdr(vid_hdr);
966 ubi_dbg_dump_stack();
967 return 1;
968}
969
970/**
971 * ubi_io_read_vid_hdr - read and check a volume identifier header.
972 * @ubi: UBI device description object
973 * @pnum: physical eraseblock number to read from
974 * @vid_hdr: &struct ubi_vid_hdr object where to store the read volume
975 * identifier header
976 * @verbose: be verbose if the header is corrupted or wasn't found
977 *
978 * This function reads the volume identifier header from physical eraseblock
979 * @pnum and stores it in @vid_hdr. It also checks CRC checksum of the read
Artem Bityutskiy74d82d22010-09-03 02:11:20 +0300980 * volume identifier header. The error codes are the same as in
981 * 'ubi_io_read_ec_hdr()'.
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400982 *
Artem Bityutskiy74d82d22010-09-03 02:11:20 +0300983 * Note, the implementation of this function is also very similar to
984 * 'ubi_io_read_ec_hdr()', so refer commentaries in 'ubi_io_read_ec_hdr()'.
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400985 */
Artem Bityutskiye88d6e102007-08-29 14:51:52 +0300986int ubi_io_read_vid_hdr(struct ubi_device *ubi, int pnum,
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400987 struct ubi_vid_hdr *vid_hdr, int verbose)
988{
Artem Bityutskiy92e1a7d2010-09-03 14:22:17 +0300989 int err, read_err;
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400990 uint32_t crc, magic, hdr_crc;
991 void *p;
992
993 dbg_io("read VID header from PEB %d", pnum);
994 ubi_assert(pnum >= 0 && pnum < ubi->peb_count);
995
996 p = (char *)vid_hdr - ubi->vid_hdr_shift;
Artem Bityutskiy92e1a7d2010-09-03 14:22:17 +0300997 read_err = ubi_io_read(ubi, p, pnum, ubi->vid_hdr_aloffset,
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400998 ubi->vid_hdr_alsize);
Artem Bityutskiy92e1a7d2010-09-03 14:22:17 +0300999 if (read_err && read_err != UBI_IO_BITFLIPS && read_err != -EBADMSG)
1000 return read_err;
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +04001001
Christoph Hellwig3261ebd2007-05-21 17:41:46 +03001002 magic = be32_to_cpu(vid_hdr->magic);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +04001003 if (magic != UBI_VID_HDR_MAGIC) {
Artem Bityutskiy92e1a7d2010-09-03 14:22:17 +03001004 if (read_err == -EBADMSG)
1005 return UBI_IO_BAD_HDR_EBADMSG;
Artem Bityutskiyeb895802010-05-03 09:04:39 +03001006
Artem Bityutskiybb00e182010-07-31 09:37:34 +03001007 if (ubi_check_pattern(vid_hdr, 0xFF, UBI_VID_HDR_SIZE)) {
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +04001008 if (verbose)
1009 ubi_warn("no VID header found at PEB %d, "
1010 "only 0xFF bytes", pnum);
Artem Bityutskiyed458192008-11-12 10:14:10 +02001011 else if (UBI_IO_DEBUG)
1012 dbg_msg("no VID header found at PEB %d, "
1013 "only 0xFF bytes", pnum);
Artem Bityutskiy92e1a7d2010-09-03 14:22:17 +03001014 if (!read_err)
1015 return UBI_IO_FF;
1016 else
1017 return UBI_IO_FF_BITFLIPS;
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +04001018 }
1019
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +04001020 if (verbose) {
1021 ubi_warn("bad magic number at PEB %d: %08x instead of "
1022 "%08x", pnum, magic, UBI_VID_HDR_MAGIC);
1023 ubi_dbg_dump_vid_hdr(vid_hdr);
Artem Bityutskiyed458192008-11-12 10:14:10 +02001024 } else if (UBI_IO_DEBUG)
1025 dbg_msg("bad magic number at PEB %d: %08x instead of "
1026 "%08x", pnum, magic, UBI_VID_HDR_MAGIC);
Artem Bityutskiy786d7832010-04-30 16:50:22 +03001027 return UBI_IO_BAD_HDR;
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +04001028 }
1029
1030 crc = crc32(UBI_CRC32_INIT, vid_hdr, UBI_VID_HDR_SIZE_CRC);
Christoph Hellwig3261ebd2007-05-21 17:41:46 +03001031 hdr_crc = be32_to_cpu(vid_hdr->hdr_crc);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +04001032
1033 if (hdr_crc != crc) {
1034 if (verbose) {
1035 ubi_warn("bad CRC at PEB %d, calculated %#08x, "
1036 "read %#08x", pnum, crc, hdr_crc);
1037 ubi_dbg_dump_vid_hdr(vid_hdr);
Artem Bityutskiyed458192008-11-12 10:14:10 +02001038 } else if (UBI_IO_DEBUG)
1039 dbg_msg("bad CRC at PEB %d, calculated %#08x, "
1040 "read %#08x", pnum, crc, hdr_crc);
Artem Bityutskiy92e1a7d2010-09-03 14:22:17 +03001041 if (!read_err)
1042 return UBI_IO_BAD_HDR;
1043 else
1044 return UBI_IO_BAD_HDR_EBADMSG;
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +04001045 }
1046
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +04001047 err = validate_vid_hdr(ubi, vid_hdr);
1048 if (err) {
1049 ubi_err("validation failed for PEB %d", pnum);
1050 return -EINVAL;
1051 }
1052
1053 return read_err ? UBI_IO_BITFLIPS : 0;
1054}
1055
1056/**
1057 * ubi_io_write_vid_hdr - write a volume identifier header.
1058 * @ubi: UBI device description object
1059 * @pnum: the physical eraseblock number to write to
1060 * @vid_hdr: the volume identifier header to write
1061 *
1062 * This function writes the volume identifier header described by @vid_hdr to
1063 * physical eraseblock @pnum. This function automatically fills the
1064 * @vid_hdr->magic and the @vid_hdr->version fields, as well as calculates
1065 * header CRC checksum and stores it at vid_hdr->hdr_crc.
1066 *
1067 * This function returns zero in case of success and a negative error code in
1068 * case of failure. If %-EIO is returned, the physical eraseblock probably went
1069 * bad.
1070 */
Artem Bityutskiye88d6e102007-08-29 14:51:52 +03001071int ubi_io_write_vid_hdr(struct ubi_device *ubi, int pnum,
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +04001072 struct ubi_vid_hdr *vid_hdr)
1073{
1074 int err;
1075 uint32_t crc;
1076 void *p;
1077
1078 dbg_io("write VID header to PEB %d", pnum);
1079 ubi_assert(pnum >= 0 && pnum < ubi->peb_count);
1080
1081 err = paranoid_check_peb_ec_hdr(ubi, pnum);
1082 if (err)
Artem Bityutskiyadbf05e2010-01-20 10:28:58 +02001083 return err;
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +04001084
Christoph Hellwig3261ebd2007-05-21 17:41:46 +03001085 vid_hdr->magic = cpu_to_be32(UBI_VID_HDR_MAGIC);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +04001086 vid_hdr->version = UBI_VERSION;
1087 crc = crc32(UBI_CRC32_INIT, vid_hdr, UBI_VID_HDR_SIZE_CRC);
Christoph Hellwig3261ebd2007-05-21 17:41:46 +03001088 vid_hdr->hdr_crc = cpu_to_be32(crc);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +04001089
1090 err = paranoid_check_vid_hdr(ubi, pnum, vid_hdr);
1091 if (err)
Artem Bityutskiyadbf05e2010-01-20 10:28:58 +02001092 return err;
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +04001093
1094 p = (char *)vid_hdr - ubi->vid_hdr_shift;
1095 err = ubi_io_write(ubi, p, pnum, ubi->vid_hdr_aloffset,
1096 ubi->vid_hdr_alsize);
1097 return err;
1098}
1099
1100#ifdef CONFIG_MTD_UBI_DEBUG_PARANOID
1101
1102/**
1103 * paranoid_check_not_bad - ensure that a physical eraseblock is not bad.
1104 * @ubi: UBI device description object
1105 * @pnum: physical eraseblock number to check
1106 *
Artem Bityutskiyadbf05e2010-01-20 10:28:58 +02001107 * This function returns zero if the physical eraseblock is good, %-EINVAL if
1108 * it is bad and a negative error code if an error occurred.
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +04001109 */
1110static int paranoid_check_not_bad(const struct ubi_device *ubi, int pnum)
1111{
1112 int err;
1113
1114 err = ubi_io_is_bad(ubi, pnum);
1115 if (!err)
1116 return err;
1117
1118 ubi_err("paranoid check failed for PEB %d", pnum);
1119 ubi_dbg_dump_stack();
Artem Bityutskiyadbf05e2010-01-20 10:28:58 +02001120 return err > 0 ? -EINVAL : err;
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +04001121}
1122
1123/**
1124 * paranoid_check_ec_hdr - check if an erase counter header is all right.
1125 * @ubi: UBI device description object
1126 * @pnum: physical eraseblock number the erase counter header belongs to
1127 * @ec_hdr: the erase counter header to check
1128 *
1129 * This function returns zero if the erase counter header contains valid
Artem Bityutskiyadbf05e2010-01-20 10:28:58 +02001130 * values, and %-EINVAL if not.
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +04001131 */
1132static int paranoid_check_ec_hdr(const struct ubi_device *ubi, int pnum,
1133 const struct ubi_ec_hdr *ec_hdr)
1134{
1135 int err;
1136 uint32_t magic;
1137
Christoph Hellwig3261ebd2007-05-21 17:41:46 +03001138 magic = be32_to_cpu(ec_hdr->magic);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +04001139 if (magic != UBI_EC_HDR_MAGIC) {
1140 ubi_err("bad magic %#08x, must be %#08x",
1141 magic, UBI_EC_HDR_MAGIC);
1142 goto fail;
1143 }
1144
1145 err = validate_ec_hdr(ubi, ec_hdr);
1146 if (err) {
1147 ubi_err("paranoid check failed for PEB %d", pnum);
1148 goto fail;
1149 }
1150
1151 return 0;
1152
1153fail:
1154 ubi_dbg_dump_ec_hdr(ec_hdr);
1155 ubi_dbg_dump_stack();
Artem Bityutskiyadbf05e2010-01-20 10:28:58 +02001156 return -EINVAL;
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +04001157}
1158
1159/**
Artem Bityutskiyebaaf1a2008-07-18 13:34:32 +03001160 * paranoid_check_peb_ec_hdr - check erase counter header.
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +04001161 * @ubi: UBI device description object
1162 * @pnum: the physical eraseblock number to check
1163 *
Artem Bityutskiyadbf05e2010-01-20 10:28:58 +02001164 * This function returns zero if the erase counter header is all right and and
1165 * a negative error code if not or if an error occurred.
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +04001166 */
1167static int paranoid_check_peb_ec_hdr(const struct ubi_device *ubi, int pnum)
1168{
1169 int err;
1170 uint32_t crc, hdr_crc;
1171 struct ubi_ec_hdr *ec_hdr;
1172
Artem Bityutskiy33818bb2007-08-28 21:29:32 +03001173 ec_hdr = kzalloc(ubi->ec_hdr_alsize, GFP_NOFS);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +04001174 if (!ec_hdr)
1175 return -ENOMEM;
1176
1177 err = ubi_io_read(ubi, ec_hdr, pnum, 0, UBI_EC_HDR_SIZE);
1178 if (err && err != UBI_IO_BITFLIPS && err != -EBADMSG)
1179 goto exit;
1180
1181 crc = crc32(UBI_CRC32_INIT, ec_hdr, UBI_EC_HDR_SIZE_CRC);
Christoph Hellwig3261ebd2007-05-21 17:41:46 +03001182 hdr_crc = be32_to_cpu(ec_hdr->hdr_crc);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +04001183 if (hdr_crc != crc) {
1184 ubi_err("bad CRC, calculated %#08x, read %#08x", crc, hdr_crc);
1185 ubi_err("paranoid check failed for PEB %d", pnum);
1186 ubi_dbg_dump_ec_hdr(ec_hdr);
1187 ubi_dbg_dump_stack();
Artem Bityutskiyadbf05e2010-01-20 10:28:58 +02001188 err = -EINVAL;
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +04001189 goto exit;
1190 }
1191
1192 err = paranoid_check_ec_hdr(ubi, pnum, ec_hdr);
1193
1194exit:
1195 kfree(ec_hdr);
1196 return err;
1197}
1198
1199/**
1200 * paranoid_check_vid_hdr - check that a volume identifier header is all right.
1201 * @ubi: UBI device description object
1202 * @pnum: physical eraseblock number the volume identifier header belongs to
1203 * @vid_hdr: the volume identifier header to check
1204 *
1205 * This function returns zero if the volume identifier header is all right, and
Artem Bityutskiyadbf05e2010-01-20 10:28:58 +02001206 * %-EINVAL if not.
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +04001207 */
1208static int paranoid_check_vid_hdr(const struct ubi_device *ubi, int pnum,
1209 const struct ubi_vid_hdr *vid_hdr)
1210{
1211 int err;
1212 uint32_t magic;
1213
Christoph Hellwig3261ebd2007-05-21 17:41:46 +03001214 magic = be32_to_cpu(vid_hdr->magic);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +04001215 if (magic != UBI_VID_HDR_MAGIC) {
1216 ubi_err("bad VID header magic %#08x at PEB %d, must be %#08x",
1217 magic, pnum, UBI_VID_HDR_MAGIC);
1218 goto fail;
1219 }
1220
1221 err = validate_vid_hdr(ubi, vid_hdr);
1222 if (err) {
1223 ubi_err("paranoid check failed for PEB %d", pnum);
1224 goto fail;
1225 }
1226
1227 return err;
1228
1229fail:
1230 ubi_err("paranoid check failed for PEB %d", pnum);
1231 ubi_dbg_dump_vid_hdr(vid_hdr);
1232 ubi_dbg_dump_stack();
Artem Bityutskiyadbf05e2010-01-20 10:28:58 +02001233 return -EINVAL;
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +04001234
1235}
1236
1237/**
Artem Bityutskiyebaaf1a2008-07-18 13:34:32 +03001238 * paranoid_check_peb_vid_hdr - check volume identifier header.
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +04001239 * @ubi: UBI device description object
1240 * @pnum: the physical eraseblock number to check
1241 *
1242 * This function returns zero if the volume identifier header is all right,
Artem Bityutskiyadbf05e2010-01-20 10:28:58 +02001243 * and a negative error code if not or if an error occurred.
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +04001244 */
1245static int paranoid_check_peb_vid_hdr(const struct ubi_device *ubi, int pnum)
1246{
1247 int err;
1248 uint32_t crc, hdr_crc;
1249 struct ubi_vid_hdr *vid_hdr;
1250 void *p;
1251
Artem Bityutskiy33818bb2007-08-28 21:29:32 +03001252 vid_hdr = ubi_zalloc_vid_hdr(ubi, GFP_NOFS);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +04001253 if (!vid_hdr)
1254 return -ENOMEM;
1255
1256 p = (char *)vid_hdr - ubi->vid_hdr_shift;
1257 err = ubi_io_read(ubi, p, pnum, ubi->vid_hdr_aloffset,
1258 ubi->vid_hdr_alsize);
1259 if (err && err != UBI_IO_BITFLIPS && err != -EBADMSG)
1260 goto exit;
1261
1262 crc = crc32(UBI_CRC32_INIT, vid_hdr, UBI_EC_HDR_SIZE_CRC);
Christoph Hellwig3261ebd2007-05-21 17:41:46 +03001263 hdr_crc = be32_to_cpu(vid_hdr->hdr_crc);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +04001264 if (hdr_crc != crc) {
1265 ubi_err("bad VID header CRC at PEB %d, calculated %#08x, "
1266 "read %#08x", pnum, crc, hdr_crc);
1267 ubi_err("paranoid check failed for PEB %d", pnum);
1268 ubi_dbg_dump_vid_hdr(vid_hdr);
1269 ubi_dbg_dump_stack();
Artem Bityutskiyadbf05e2010-01-20 10:28:58 +02001270 err = -EINVAL;
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +04001271 goto exit;
1272 }
1273
1274 err = paranoid_check_vid_hdr(ubi, pnum, vid_hdr);
1275
1276exit:
1277 ubi_free_vid_hdr(ubi, vid_hdr);
1278 return err;
1279}
1280
1281/**
Artem Bityutskiy6e9065d2010-01-25 17:09:30 +02001282 * ubi_dbg_check_write - make sure write succeeded.
1283 * @ubi: UBI device description object
1284 * @buf: buffer with data which were written
1285 * @pnum: physical eraseblock number the data were written to
1286 * @offset: offset within the physical eraseblock the data were written to
1287 * @len: how many bytes were written
1288 *
1289 * This functions reads data which were recently written and compares it with
1290 * the original data buffer - the data have to match. Returns zero if the data
1291 * match and a negative error code if not or in case of failure.
1292 */
1293int ubi_dbg_check_write(struct ubi_device *ubi, const void *buf, int pnum,
1294 int offset, int len)
1295{
1296 int err, i;
1297
1298 mutex_lock(&ubi->dbg_buf_mutex);
1299 err = ubi_io_read(ubi, ubi->dbg_peb_buf, pnum, offset, len);
1300 if (err)
1301 goto out_unlock;
1302
1303 for (i = 0; i < len; i++) {
1304 uint8_t c = ((uint8_t *)buf)[i];
1305 uint8_t c1 = ((uint8_t *)ubi->dbg_peb_buf)[i];
1306 int dump_len;
1307
1308 if (c == c1)
1309 continue;
1310
1311 ubi_err("paranoid check failed for PEB %d:%d, len %d",
1312 pnum, offset, len);
1313 ubi_msg("data differ at position %d", i);
1314 dump_len = max_t(int, 128, len - i);
1315 ubi_msg("hex dump of the original buffer from %d to %d",
1316 i, i + dump_len);
1317 print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_OFFSET, 32, 1,
1318 buf + i, dump_len, 1);
1319 ubi_msg("hex dump of the read buffer from %d to %d",
1320 i, i + dump_len);
1321 print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_OFFSET, 32, 1,
1322 ubi->dbg_peb_buf + i, dump_len, 1);
1323 ubi_dbg_dump_stack();
1324 err = -EINVAL;
1325 goto out_unlock;
1326 }
1327 mutex_unlock(&ubi->dbg_buf_mutex);
1328
1329 return 0;
1330
1331out_unlock:
1332 mutex_unlock(&ubi->dbg_buf_mutex);
1333 return err;
1334}
1335
1336/**
Artem Bityutskiy40a71a82009-06-28 19:16:55 +03001337 * ubi_dbg_check_all_ff - check that a region of flash is empty.
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +04001338 * @ubi: UBI device description object
1339 * @pnum: the physical eraseblock number to check
1340 * @offset: the starting offset within the physical eraseblock to check
1341 * @len: the length of the region to check
1342 *
1343 * This function returns zero if only 0xFF bytes are present at offset
Artem Bityutskiyadbf05e2010-01-20 10:28:58 +02001344 * @offset of the physical eraseblock @pnum, and a negative error code if not
1345 * or if an error occurred.
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +04001346 */
Artem Bityutskiy40a71a82009-06-28 19:16:55 +03001347int ubi_dbg_check_all_ff(struct ubi_device *ubi, int pnum, int offset, int len)
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +04001348{
1349 size_t read;
1350 int err;
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +04001351 loff_t addr = (loff_t)pnum * ubi->peb_size + offset;
1352
Artem Bityutskiye88d6e102007-08-29 14:51:52 +03001353 mutex_lock(&ubi->dbg_buf_mutex);
1354 err = ubi->mtd->read(ubi->mtd, addr, len, &read, ubi->dbg_peb_buf);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +04001355 if (err && err != -EUCLEAN) {
1356 ubi_err("error %d while reading %d bytes from PEB %d:%d, "
1357 "read %zd bytes", err, len, pnum, offset, read);
1358 goto error;
1359 }
1360
Artem Bityutskiybb00e182010-07-31 09:37:34 +03001361 err = ubi_check_pattern(ubi->dbg_peb_buf, 0xFF, len);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +04001362 if (err == 0) {
1363 ubi_err("flash region at PEB %d:%d, length %d does not "
1364 "contain all 0xFF bytes", pnum, offset, len);
1365 goto fail;
1366 }
Artem Bityutskiye88d6e102007-08-29 14:51:52 +03001367 mutex_unlock(&ubi->dbg_buf_mutex);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +04001368
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +04001369 return 0;
1370
1371fail:
1372 ubi_err("paranoid check failed for PEB %d", pnum);
Artem Bityutskiyc8566352008-07-16 17:40:22 +03001373 ubi_msg("hex dump of the %d-%d region", offset, offset + len);
Artem Bityutskiy69866462007-08-29 14:56:20 +03001374 print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_OFFSET, 32, 1,
Artem Bityutskiye88d6e102007-08-29 14:51:52 +03001375 ubi->dbg_peb_buf, len, 1);
Artem Bityutskiyadbf05e2010-01-20 10:28:58 +02001376 err = -EINVAL;
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +04001377error:
1378 ubi_dbg_dump_stack();
Artem Bityutskiye88d6e102007-08-29 14:51:52 +03001379 mutex_unlock(&ubi->dbg_buf_mutex);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +04001380 return err;
1381}
1382
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +04001383#endif /* CONFIG_MTD_UBI_DEBUG_PARANOID */