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Commit | Line | Data |
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801c135c AB |
1 | /* |
2 | * Copyright (c) International Business Machines Corp., 2006 | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License as published by | |
6 | * the Free Software Foundation; either version 2 of the License, or | |
7 | * (at your option) any later version. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See | |
12 | * the GNU General Public License for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License | |
15 | * along with this program; if not, write to the Free Software | |
16 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
17 | * | |
18 | * Author: Artem Bityutskiy (Битюцкий Артём) | |
19 | */ | |
20 | ||
21 | /* | |
fbd0107f | 22 | * UBI attaching sub-system. |
801c135c | 23 | * |
fbd0107f AB |
24 | * This sub-system is responsible for attaching MTD devices and it also |
25 | * implements flash media scanning. | |
801c135c | 26 | * |
a4e6042f | 27 | * The attaching information is represented by a &struct ubi_attach_info' |
fbd0107f AB |
28 | * object. Information about volumes is represented by &struct ubi_ainf_volume |
29 | * objects which are kept in volume RB-tree with root at the @volumes field. | |
30 | * The RB-tree is indexed by the volume ID. | |
801c135c | 31 | * |
fbd0107f AB |
32 | * Logical eraseblocks are represented by &struct ubi_ainf_peb objects. These |
33 | * objects are kept in per-volume RB-trees with the root at the corresponding | |
34 | * &struct ubi_ainf_volume object. To put it differently, we keep an RB-tree of | |
35 | * per-volume objects and each of these objects is the root of RB-tree of | |
36 | * per-LEB objects. | |
801c135c AB |
37 | * |
38 | * Corrupted physical eraseblocks are put to the @corr list, free physical | |
39 | * eraseblocks are put to the @free list and the physical eraseblock to be | |
40 | * erased are put to the @erase list. | |
0525dac9 | 41 | * |
fef2deb3 AB |
42 | * About corruptions |
43 | * ~~~~~~~~~~~~~~~~~ | |
44 | * | |
45 | * UBI protects EC and VID headers with CRC-32 checksums, so it can detect | |
46 | * whether the headers are corrupted or not. Sometimes UBI also protects the | |
47 | * data with CRC-32, e.g., when it executes the atomic LEB change operation, or | |
48 | * when it moves the contents of a PEB for wear-leveling purposes. | |
49 | * | |
0525dac9 | 50 | * UBI tries to distinguish between 2 types of corruptions. |
fef2deb3 AB |
51 | * |
52 | * 1. Corruptions caused by power cuts. These are expected corruptions and UBI | |
53 | * tries to handle them gracefully, without printing too many warnings and | |
fbd0107f AB |
54 | * error messages. The idea is that we do not lose important data in these |
55 | * cases - we may lose only the data which were being written to the media just | |
56 | * before the power cut happened, and the upper layers (e.g., UBIFS) are | |
57 | * supposed to handle such data losses (e.g., by using the FS journal). | |
fef2deb3 AB |
58 | * |
59 | * When UBI detects a corruption (CRC-32 mismatch) in a PEB, and it looks like | |
60 | * the reason is a power cut, UBI puts this PEB to the @erase list, and all | |
61 | * PEBs in the @erase list are scheduled for erasure later. | |
0525dac9 AB |
62 | * |
63 | * 2. Unexpected corruptions which are not caused by power cuts. During | |
fbd0107f | 64 | * attaching, such PEBs are put to the @corr list and UBI preserves them. |
fef2deb3 AB |
65 | * Obviously, this lessens the amount of available PEBs, and if at some point |
66 | * UBI runs out of free PEBs, it switches to R/O mode. UBI also loudly informs | |
67 | * about such PEBs every time the MTD device is attached. | |
45aafd32 AB |
68 | * |
69 | * However, it is difficult to reliably distinguish between these types of | |
fbd0107f AB |
70 | * corruptions and UBI's strategy is as follows (in case of attaching by |
71 | * scanning). UBI assumes corruption type 2 if the VID header is corrupted and | |
72 | * the data area does not contain all 0xFFs, and there were no bit-flips or | |
73 | * integrity errors (e.g., ECC errors in case of NAND) while reading the data | |
74 | * area. Otherwise UBI assumes corruption type 1. So the decision criteria | |
75 | * are as follows. | |
76 | * o If the data area contains only 0xFFs, there are no data, and it is safe | |
fef2deb3 AB |
77 | * to just erase this PEB - this is corruption type 1. |
78 | * o If the data area has bit-flips or data integrity errors (ECC errors on | |
45aafd32 | 79 | * NAND), it is probably a PEB which was being erased when power cut |
fef2deb3 AB |
80 | * happened, so this is corruption type 1. However, this is just a guess, |
81 | * which might be wrong. | |
55393ba1 | 82 | * o Otherwise this is corruption type 2. |
801c135c AB |
83 | */ |
84 | ||
85 | #include <linux/err.h> | |
5a0e3ad6 | 86 | #include <linux/slab.h> |
801c135c | 87 | #include <linux/crc32.h> |
3013ee31 | 88 | #include <linux/math64.h> |
095751a6 | 89 | #include <linux/random.h> |
801c135c AB |
90 | #include "ubi.h" |
91 | ||
a4e6042f | 92 | static int self_check_ai(struct ubi_device *ubi, struct ubi_attach_info *ai); |
801c135c AB |
93 | |
94 | /* Temporary variables used during scanning */ | |
95 | static struct ubi_ec_hdr *ech; | |
96 | static struct ubi_vid_hdr *vidh; | |
97 | ||
941dfb07 | 98 | /** |
78d87c95 | 99 | * add_to_list - add physical eraseblock to a list. |
a4e6042f | 100 | * @ai: attaching information |
78d87c95 | 101 | * @pnum: physical eraseblock number to add |
6dd3bc7e JR |
102 | * @vol_id: the last used volume id for the PEB |
103 | * @lnum: the last used LEB number for the PEB | |
78d87c95 | 104 | * @ec: erase counter of the physical eraseblock |
0525dac9 | 105 | * @to_head: if not zero, add to the head of the list |
78d87c95 AB |
106 | * @list: the list to add to |
107 | * | |
fbd0107f AB |
108 | * This function allocates a 'struct ubi_ainf_peb' object for physical |
109 | * eraseblock @pnum and adds it to the "free", "erase", or "alien" lists. | |
6dd3bc7e JR |
110 | * It stores the @lnum and @vol_id alongside, which can both be |
111 | * %UBI_UNKNOWN if they are not available, not readable, or not assigned. | |
0525dac9 AB |
112 | * If @to_head is not zero, PEB will be added to the head of the list, which |
113 | * basically means it will be processed first later. E.g., we add corrupted | |
114 | * PEBs (corrupted due to power cuts) to the head of the erase list to make | |
115 | * sure we erase them first and get rid of corruptions ASAP. This function | |
116 | * returns zero in case of success and a negative error code in case of | |
3fb34124 | 117 | * failure. |
78d87c95 | 118 | */ |
6dd3bc7e JR |
119 | static int add_to_list(struct ubi_attach_info *ai, int pnum, int vol_id, |
120 | int lnum, int ec, int to_head, struct list_head *list) | |
801c135c | 121 | { |
2c5ec5ce | 122 | struct ubi_ainf_peb *aeb; |
801c135c | 123 | |
a4e6042f | 124 | if (list == &ai->free) { |
801c135c | 125 | dbg_bld("add to free: PEB %d, EC %d", pnum, ec); |
a4e6042f | 126 | } else if (list == &ai->erase) { |
801c135c | 127 | dbg_bld("add to erase: PEB %d, EC %d", pnum, ec); |
a4e6042f | 128 | } else if (list == &ai->alien) { |
801c135c | 129 | dbg_bld("add to alien: PEB %d, EC %d", pnum, ec); |
a4e6042f | 130 | ai->alien_peb_count += 1; |
33789fb9 | 131 | } else |
801c135c AB |
132 | BUG(); |
133 | ||
1fc2e3e5 | 134 | aeb = kmem_cache_alloc(ai->aeb_slab_cache, GFP_KERNEL); |
2c5ec5ce | 135 | if (!aeb) |
801c135c AB |
136 | return -ENOMEM; |
137 | ||
2c5ec5ce | 138 | aeb->pnum = pnum; |
6dd3bc7e JR |
139 | aeb->vol_id = vol_id; |
140 | aeb->lnum = lnum; | |
2c5ec5ce | 141 | aeb->ec = ec; |
0525dac9 | 142 | if (to_head) |
2c5ec5ce | 143 | list_add(&aeb->u.list, list); |
0525dac9 | 144 | else |
2c5ec5ce | 145 | list_add_tail(&aeb->u.list, list); |
801c135c AB |
146 | return 0; |
147 | } | |
148 | ||
3fb34124 AB |
149 | /** |
150 | * add_corrupted - add a corrupted physical eraseblock. | |
a4e6042f | 151 | * @ai: attaching information |
3fb34124 AB |
152 | * @pnum: physical eraseblock number to add |
153 | * @ec: erase counter of the physical eraseblock | |
154 | * | |
fbd0107f AB |
155 | * This function allocates a 'struct ubi_ainf_peb' object for a corrupted |
156 | * physical eraseblock @pnum and adds it to the 'corr' list. The corruption | |
157 | * was presumably not caused by a power cut. Returns zero in case of success | |
158 | * and a negative error code in case of failure. | |
3fb34124 | 159 | */ |
a4e6042f | 160 | static int add_corrupted(struct ubi_attach_info *ai, int pnum, int ec) |
3fb34124 | 161 | { |
2c5ec5ce | 162 | struct ubi_ainf_peb *aeb; |
3fb34124 AB |
163 | |
164 | dbg_bld("add to corrupted: PEB %d, EC %d", pnum, ec); | |
165 | ||
1fc2e3e5 | 166 | aeb = kmem_cache_alloc(ai->aeb_slab_cache, GFP_KERNEL); |
2c5ec5ce | 167 | if (!aeb) |
3fb34124 AB |
168 | return -ENOMEM; |
169 | ||
a4e6042f | 170 | ai->corr_peb_count += 1; |
2c5ec5ce AB |
171 | aeb->pnum = pnum; |
172 | aeb->ec = ec; | |
a4e6042f | 173 | list_add(&aeb->u.list, &ai->corr); |
3fb34124 AB |
174 | return 0; |
175 | } | |
176 | ||
801c135c | 177 | /** |
ebaaf1af | 178 | * validate_vid_hdr - check volume identifier header. |
801c135c | 179 | * @vid_hdr: the volume identifier header to check |
517af48c | 180 | * @av: information about the volume this logical eraseblock belongs to |
801c135c AB |
181 | * @pnum: physical eraseblock number the VID header came from |
182 | * | |
183 | * This function checks that data stored in @vid_hdr is consistent. Returns | |
184 | * non-zero if an inconsistency was found and zero if not. | |
185 | * | |
186 | * Note, UBI does sanity check of everything it reads from the flash media. | |
85c6e6e2 | 187 | * Most of the checks are done in the I/O sub-system. Here we check that the |
801c135c AB |
188 | * information in the VID header is consistent to the information in other VID |
189 | * headers of the same volume. | |
190 | */ | |
191 | static int validate_vid_hdr(const struct ubi_vid_hdr *vid_hdr, | |
517af48c | 192 | const struct ubi_ainf_volume *av, int pnum) |
801c135c AB |
193 | { |
194 | int vol_type = vid_hdr->vol_type; | |
3261ebd7 CH |
195 | int vol_id = be32_to_cpu(vid_hdr->vol_id); |
196 | int used_ebs = be32_to_cpu(vid_hdr->used_ebs); | |
197 | int data_pad = be32_to_cpu(vid_hdr->data_pad); | |
801c135c | 198 | |
517af48c AB |
199 | if (av->leb_count != 0) { |
200 | int av_vol_type; | |
801c135c AB |
201 | |
202 | /* | |
203 | * This is not the first logical eraseblock belonging to this | |
204 | * volume. Ensure that the data in its VID header is consistent | |
205 | * to the data in previous logical eraseblock headers. | |
206 | */ | |
207 | ||
517af48c | 208 | if (vol_id != av->vol_id) { |
e2986827 | 209 | ubi_err("inconsistent vol_id"); |
801c135c AB |
210 | goto bad; |
211 | } | |
212 | ||
517af48c AB |
213 | if (av->vol_type == UBI_STATIC_VOLUME) |
214 | av_vol_type = UBI_VID_STATIC; | |
801c135c | 215 | else |
517af48c | 216 | av_vol_type = UBI_VID_DYNAMIC; |
801c135c | 217 | |
517af48c | 218 | if (vol_type != av_vol_type) { |
e2986827 | 219 | ubi_err("inconsistent vol_type"); |
801c135c AB |
220 | goto bad; |
221 | } | |
222 | ||
517af48c | 223 | if (used_ebs != av->used_ebs) { |
e2986827 | 224 | ubi_err("inconsistent used_ebs"); |
801c135c AB |
225 | goto bad; |
226 | } | |
227 | ||
517af48c | 228 | if (data_pad != av->data_pad) { |
e2986827 | 229 | ubi_err("inconsistent data_pad"); |
801c135c AB |
230 | goto bad; |
231 | } | |
232 | } | |
233 | ||
234 | return 0; | |
235 | ||
236 | bad: | |
237 | ubi_err("inconsistent VID header at PEB %d", pnum); | |
a904e3f1 | 238 | ubi_dump_vid_hdr(vid_hdr); |
517af48c | 239 | ubi_dump_av(av); |
801c135c AB |
240 | return -EINVAL; |
241 | } | |
242 | ||
243 | /** | |
a4e6042f AB |
244 | * add_volume - add volume to the attaching information. |
245 | * @ai: attaching information | |
801c135c AB |
246 | * @vol_id: ID of the volume to add |
247 | * @pnum: physical eraseblock number | |
248 | * @vid_hdr: volume identifier header | |
249 | * | |
250 | * If the volume corresponding to the @vid_hdr logical eraseblock is already | |
a4e6042f AB |
251 | * present in the attaching information, this function does nothing. Otherwise |
252 | * it adds corresponding volume to the attaching information. Returns a pointer | |
fbd0107f AB |
253 | * to the allocated "av" object in case of success and a negative error code in |
254 | * case of failure. | |
801c135c | 255 | */ |
a4e6042f | 256 | static struct ubi_ainf_volume *add_volume(struct ubi_attach_info *ai, |
afc15a81 | 257 | int vol_id, int pnum, |
801c135c AB |
258 | const struct ubi_vid_hdr *vid_hdr) |
259 | { | |
517af48c | 260 | struct ubi_ainf_volume *av; |
a4e6042f | 261 | struct rb_node **p = &ai->volumes.rb_node, *parent = NULL; |
801c135c | 262 | |
3261ebd7 | 263 | ubi_assert(vol_id == be32_to_cpu(vid_hdr->vol_id)); |
801c135c AB |
264 | |
265 | /* Walk the volume RB-tree to look if this volume is already present */ | |
266 | while (*p) { | |
267 | parent = *p; | |
517af48c | 268 | av = rb_entry(parent, struct ubi_ainf_volume, rb); |
801c135c | 269 | |
517af48c AB |
270 | if (vol_id == av->vol_id) |
271 | return av; | |
801c135c | 272 | |
517af48c | 273 | if (vol_id > av->vol_id) |
801c135c AB |
274 | p = &(*p)->rb_left; |
275 | else | |
276 | p = &(*p)->rb_right; | |
277 | } | |
278 | ||
279 | /* The volume is absent - add it */ | |
517af48c AB |
280 | av = kmalloc(sizeof(struct ubi_ainf_volume), GFP_KERNEL); |
281 | if (!av) | |
801c135c AB |
282 | return ERR_PTR(-ENOMEM); |
283 | ||
517af48c AB |
284 | av->highest_lnum = av->leb_count = 0; |
285 | av->vol_id = vol_id; | |
286 | av->root = RB_ROOT; | |
287 | av->used_ebs = be32_to_cpu(vid_hdr->used_ebs); | |
288 | av->data_pad = be32_to_cpu(vid_hdr->data_pad); | |
289 | av->compat = vid_hdr->compat; | |
290 | av->vol_type = vid_hdr->vol_type == UBI_VID_DYNAMIC ? UBI_DYNAMIC_VOLUME | |
801c135c | 291 | : UBI_STATIC_VOLUME; |
a4e6042f AB |
292 | if (vol_id > ai->highest_vol_id) |
293 | ai->highest_vol_id = vol_id; | |
801c135c | 294 | |
517af48c AB |
295 | rb_link_node(&av->rb, parent, p); |
296 | rb_insert_color(&av->rb, &ai->volumes); | |
a4e6042f | 297 | ai->vols_found += 1; |
801c135c | 298 | dbg_bld("added volume %d", vol_id); |
517af48c | 299 | return av; |
801c135c AB |
300 | } |
301 | ||
302 | /** | |
dac6e208 | 303 | * ubi_compare_lebs - find out which logical eraseblock is newer. |
801c135c | 304 | * @ubi: UBI device description object |
2c5ec5ce | 305 | * @aeb: first logical eraseblock to compare |
801c135c AB |
306 | * @pnum: physical eraseblock number of the second logical eraseblock to |
307 | * compare | |
308 | * @vid_hdr: volume identifier header of the second logical eraseblock | |
309 | * | |
310 | * This function compares 2 copies of a LEB and informs which one is newer. In | |
311 | * case of success this function returns a positive value, in case of failure, a | |
312 | * negative error code is returned. The success return codes use the following | |
313 | * bits: | |
2c5ec5ce | 314 | * o bit 0 is cleared: the first PEB (described by @aeb) is newer than the |
801c135c AB |
315 | * second PEB (described by @pnum and @vid_hdr); |
316 | * o bit 0 is set: the second PEB is newer; | |
317 | * o bit 1 is cleared: no bit-flips were detected in the newer LEB; | |
318 | * o bit 1 is set: bit-flips were detected in the newer LEB; | |
319 | * o bit 2 is cleared: the older LEB is not corrupted; | |
320 | * o bit 2 is set: the older LEB is corrupted. | |
321 | */ | |
dac6e208 | 322 | int ubi_compare_lebs(struct ubi_device *ubi, const struct ubi_ainf_peb *aeb, |
e88d6e10 | 323 | int pnum, const struct ubi_vid_hdr *vid_hdr) |
801c135c | 324 | { |
801c135c AB |
325 | int len, err, second_is_newer, bitflips = 0, corrupted = 0; |
326 | uint32_t data_crc, crc; | |
8bc22961 | 327 | struct ubi_vid_hdr *vh = NULL; |
3261ebd7 | 328 | unsigned long long sqnum2 = be64_to_cpu(vid_hdr->sqnum); |
801c135c | 329 | |
2c5ec5ce | 330 | if (sqnum2 == aeb->sqnum) { |
801c135c | 331 | /* |
9869cd80 AB |
332 | * This must be a really ancient UBI image which has been |
333 | * created before sequence numbers support has been added. At | |
334 | * that times we used 32-bit LEB versions stored in logical | |
335 | * eraseblocks. That was before UBI got into mainline. We do not | |
0525dac9 AB |
336 | * support these images anymore. Well, those images still work, |
337 | * but only if no unclean reboots happened. | |
801c135c | 338 | */ |
dac6e208 | 339 | ubi_err("unsupported on-flash UBI format"); |
9869cd80 AB |
340 | return -EINVAL; |
341 | } | |
64203195 | 342 | |
9869cd80 | 343 | /* Obviously the LEB with lower sequence counter is older */ |
2c5ec5ce | 344 | second_is_newer = (sqnum2 > aeb->sqnum); |
801c135c AB |
345 | |
346 | /* | |
347 | * Now we know which copy is newer. If the copy flag of the PEB with | |
348 | * newer version is not set, then we just return, otherwise we have to | |
349 | * check data CRC. For the second PEB we already have the VID header, | |
350 | * for the first one - we'll need to re-read it from flash. | |
351 | * | |
9869cd80 | 352 | * Note: this may be optimized so that we wouldn't read twice. |
801c135c AB |
353 | */ |
354 | ||
355 | if (second_is_newer) { | |
356 | if (!vid_hdr->copy_flag) { | |
357 | /* It is not a copy, so it is newer */ | |
358 | dbg_bld("second PEB %d is newer, copy_flag is unset", | |
359 | pnum); | |
360 | return 1; | |
361 | } | |
362 | } else { | |
2c5ec5ce | 363 | if (!aeb->copy_flag) { |
fb22b59b AB |
364 | /* It is not a copy, so it is newer */ |
365 | dbg_bld("first PEB %d is newer, copy_flag is unset", | |
366 | pnum); | |
367 | return bitflips << 1; | |
368 | } | |
801c135c | 369 | |
33818bbb | 370 | vh = ubi_zalloc_vid_hdr(ubi, GFP_KERNEL); |
8bc22961 | 371 | if (!vh) |
801c135c AB |
372 | return -ENOMEM; |
373 | ||
2c5ec5ce | 374 | pnum = aeb->pnum; |
8bc22961 | 375 | err = ubi_io_read_vid_hdr(ubi, pnum, vh, 0); |
801c135c AB |
376 | if (err) { |
377 | if (err == UBI_IO_BITFLIPS) | |
378 | bitflips = 1; | |
379 | else { | |
049333ce AB |
380 | ubi_err("VID of PEB %d header is bad, but it was OK earlier, err %d", |
381 | pnum, err); | |
801c135c AB |
382 | if (err > 0) |
383 | err = -EIO; | |
384 | ||
385 | goto out_free_vidh; | |
386 | } | |
387 | } | |
388 | ||
8bc22961 | 389 | vid_hdr = vh; |
801c135c AB |
390 | } |
391 | ||
392 | /* Read the data of the copy and check the CRC */ | |
393 | ||
3261ebd7 | 394 | len = be32_to_cpu(vid_hdr->data_size); |
801c135c | 395 | |
d125a753 AB |
396 | mutex_lock(&ubi->buf_mutex); |
397 | err = ubi_io_read_data(ubi, ubi->peb_buf, pnum, 0, len); | |
d57f4054 | 398 | if (err && err != UBI_IO_BITFLIPS && !mtd_is_eccerr(err)) |
d125a753 | 399 | goto out_unlock; |
801c135c | 400 | |
3261ebd7 | 401 | data_crc = be32_to_cpu(vid_hdr->data_crc); |
d125a753 | 402 | crc = crc32(UBI_CRC32_INIT, ubi->peb_buf, len); |
801c135c AB |
403 | if (crc != data_crc) { |
404 | dbg_bld("PEB %d CRC error: calculated %#08x, must be %#08x", | |
405 | pnum, crc, data_crc); | |
406 | corrupted = 1; | |
407 | bitflips = 0; | |
408 | second_is_newer = !second_is_newer; | |
409 | } else { | |
410 | dbg_bld("PEB %d CRC is OK", pnum); | |
411 | bitflips = !!err; | |
412 | } | |
d125a753 | 413 | mutex_unlock(&ubi->buf_mutex); |
801c135c | 414 | |
8bc22961 | 415 | ubi_free_vid_hdr(ubi, vh); |
801c135c AB |
416 | |
417 | if (second_is_newer) | |
418 | dbg_bld("second PEB %d is newer, copy_flag is set", pnum); | |
419 | else | |
420 | dbg_bld("first PEB %d is newer, copy_flag is set", pnum); | |
421 | ||
422 | return second_is_newer | (bitflips << 1) | (corrupted << 2); | |
423 | ||
d125a753 AB |
424 | out_unlock: |
425 | mutex_unlock(&ubi->buf_mutex); | |
801c135c | 426 | out_free_vidh: |
8bc22961 | 427 | ubi_free_vid_hdr(ubi, vh); |
801c135c AB |
428 | return err; |
429 | } | |
430 | ||
431 | /** | |
fbd0107f | 432 | * ubi_add_to_av - add used physical eraseblock to the attaching information. |
801c135c | 433 | * @ubi: UBI device description object |
a4e6042f | 434 | * @ai: attaching information |
801c135c AB |
435 | * @pnum: the physical eraseblock number |
436 | * @ec: erase counter | |
437 | * @vid_hdr: the volume identifier header | |
438 | * @bitflips: if bit-flips were detected when this physical eraseblock was read | |
439 | * | |
79b510c0 AB |
440 | * This function adds information about a used physical eraseblock to the |
441 | * 'used' tree of the corresponding volume. The function is rather complex | |
442 | * because it has to handle cases when this is not the first physical | |
443 | * eraseblock belonging to the same logical eraseblock, and the newer one has | |
444 | * to be picked, while the older one has to be dropped. This function returns | |
445 | * zero in case of success and a negative error code in case of failure. | |
801c135c | 446 | */ |
3561188a AB |
447 | int ubi_add_to_av(struct ubi_device *ubi, struct ubi_attach_info *ai, int pnum, |
448 | int ec, const struct ubi_vid_hdr *vid_hdr, int bitflips) | |
801c135c AB |
449 | { |
450 | int err, vol_id, lnum; | |
801c135c | 451 | unsigned long long sqnum; |
517af48c | 452 | struct ubi_ainf_volume *av; |
2c5ec5ce | 453 | struct ubi_ainf_peb *aeb; |
801c135c AB |
454 | struct rb_node **p, *parent = NULL; |
455 | ||
3261ebd7 CH |
456 | vol_id = be32_to_cpu(vid_hdr->vol_id); |
457 | lnum = be32_to_cpu(vid_hdr->lnum); | |
458 | sqnum = be64_to_cpu(vid_hdr->sqnum); | |
801c135c | 459 | |
9869cd80 AB |
460 | dbg_bld("PEB %d, LEB %d:%d, EC %d, sqnum %llu, bitflips %d", |
461 | pnum, vol_id, lnum, ec, sqnum, bitflips); | |
801c135c | 462 | |
517af48c AB |
463 | av = add_volume(ai, vol_id, pnum, vid_hdr); |
464 | if (IS_ERR(av)) | |
465 | return PTR_ERR(av); | |
801c135c | 466 | |
a4e6042f AB |
467 | if (ai->max_sqnum < sqnum) |
468 | ai->max_sqnum = sqnum; | |
76eafe47 | 469 | |
801c135c AB |
470 | /* |
471 | * Walk the RB-tree of logical eraseblocks of volume @vol_id to look | |
472 | * if this is the first instance of this logical eraseblock or not. | |
473 | */ | |
517af48c | 474 | p = &av->root.rb_node; |
801c135c AB |
475 | while (*p) { |
476 | int cmp_res; | |
477 | ||
478 | parent = *p; | |
2c5ec5ce AB |
479 | aeb = rb_entry(parent, struct ubi_ainf_peb, u.rb); |
480 | if (lnum != aeb->lnum) { | |
481 | if (lnum < aeb->lnum) | |
801c135c AB |
482 | p = &(*p)->rb_left; |
483 | else | |
484 | p = &(*p)->rb_right; | |
485 | continue; | |
486 | } | |
487 | ||
488 | /* | |
489 | * There is already a physical eraseblock describing the same | |
490 | * logical eraseblock present. | |
491 | */ | |
492 | ||
2c5ec5ce AB |
493 | dbg_bld("this LEB already exists: PEB %d, sqnum %llu, EC %d", |
494 | aeb->pnum, aeb->sqnum, aeb->ec); | |
801c135c AB |
495 | |
496 | /* | |
497 | * Make sure that the logical eraseblocks have different | |
498 | * sequence numbers. Otherwise the image is bad. | |
499 | * | |
9869cd80 AB |
500 | * However, if the sequence number is zero, we assume it must |
501 | * be an ancient UBI image from the era when UBI did not have | |
502 | * sequence numbers. We still can attach these images, unless | |
503 | * there is a need to distinguish between old and new | |
504 | * eraseblocks, in which case we'll refuse the image in | |
dac6e208 | 505 | * 'ubi_compare_lebs()'. In other words, we attach old clean |
9869cd80 AB |
506 | * images, but refuse attaching old images with duplicated |
507 | * logical eraseblocks because there was an unclean reboot. | |
801c135c | 508 | */ |
2c5ec5ce | 509 | if (aeb->sqnum == sqnum && sqnum != 0) { |
801c135c AB |
510 | ubi_err("two LEBs with same sequence number %llu", |
511 | sqnum); | |
2c5ec5ce | 512 | ubi_dump_aeb(aeb, 0); |
a904e3f1 | 513 | ubi_dump_vid_hdr(vid_hdr); |
801c135c AB |
514 | return -EINVAL; |
515 | } | |
516 | ||
517 | /* | |
518 | * Now we have to drop the older one and preserve the newer | |
519 | * one. | |
520 | */ | |
dac6e208 | 521 | cmp_res = ubi_compare_lebs(ubi, aeb, pnum, vid_hdr); |
801c135c AB |
522 | if (cmp_res < 0) |
523 | return cmp_res; | |
524 | ||
525 | if (cmp_res & 1) { | |
526 | /* | |
3f502622 | 527 | * This logical eraseblock is newer than the one |
801c135c AB |
528 | * found earlier. |
529 | */ | |
517af48c | 530 | err = validate_vid_hdr(vid_hdr, av, pnum); |
801c135c AB |
531 | if (err) |
532 | return err; | |
533 | ||
6dd3bc7e JR |
534 | err = add_to_list(ai, aeb->pnum, aeb->vol_id, |
535 | aeb->lnum, aeb->ec, cmp_res & 4, | |
a4e6042f | 536 | &ai->erase); |
801c135c AB |
537 | if (err) |
538 | return err; | |
539 | ||
2c5ec5ce AB |
540 | aeb->ec = ec; |
541 | aeb->pnum = pnum; | |
6dd3bc7e JR |
542 | aeb->vol_id = vol_id; |
543 | aeb->lnum = lnum; | |
2c5ec5ce AB |
544 | aeb->scrub = ((cmp_res & 2) || bitflips); |
545 | aeb->copy_flag = vid_hdr->copy_flag; | |
546 | aeb->sqnum = sqnum; | |
801c135c | 547 | |
517af48c AB |
548 | if (av->highest_lnum == lnum) |
549 | av->last_data_size = | |
3261ebd7 | 550 | be32_to_cpu(vid_hdr->data_size); |
801c135c AB |
551 | |
552 | return 0; | |
553 | } else { | |
554 | /* | |
025dfdaf | 555 | * This logical eraseblock is older than the one found |
801c135c AB |
556 | * previously. |
557 | */ | |
6dd3bc7e JR |
558 | return add_to_list(ai, pnum, vol_id, lnum, ec, |
559 | cmp_res & 4, &ai->erase); | |
801c135c AB |
560 | } |
561 | } | |
562 | ||
563 | /* | |
564 | * We've met this logical eraseblock for the first time, add it to the | |
a4e6042f | 565 | * attaching information. |
801c135c AB |
566 | */ |
567 | ||
517af48c | 568 | err = validate_vid_hdr(vid_hdr, av, pnum); |
801c135c AB |
569 | if (err) |
570 | return err; | |
571 | ||
1fc2e3e5 | 572 | aeb = kmem_cache_alloc(ai->aeb_slab_cache, GFP_KERNEL); |
2c5ec5ce | 573 | if (!aeb) |
801c135c AB |
574 | return -ENOMEM; |
575 | ||
2c5ec5ce AB |
576 | aeb->ec = ec; |
577 | aeb->pnum = pnum; | |
6dd3bc7e | 578 | aeb->vol_id = vol_id; |
2c5ec5ce AB |
579 | aeb->lnum = lnum; |
580 | aeb->scrub = bitflips; | |
581 | aeb->copy_flag = vid_hdr->copy_flag; | |
582 | aeb->sqnum = sqnum; | |
801c135c | 583 | |
517af48c AB |
584 | if (av->highest_lnum <= lnum) { |
585 | av->highest_lnum = lnum; | |
586 | av->last_data_size = be32_to_cpu(vid_hdr->data_size); | |
801c135c AB |
587 | } |
588 | ||
517af48c | 589 | av->leb_count += 1; |
2c5ec5ce | 590 | rb_link_node(&aeb->u.rb, parent, p); |
517af48c | 591 | rb_insert_color(&aeb->u.rb, &av->root); |
801c135c AB |
592 | return 0; |
593 | } | |
594 | ||
595 | /** | |
dcd85fdd | 596 | * ubi_find_av - find volume in the attaching information. |
a4e6042f | 597 | * @ai: attaching information |
801c135c AB |
598 | * @vol_id: the requested volume ID |
599 | * | |
600 | * This function returns a pointer to the volume description or %NULL if there | |
a4e6042f | 601 | * are no data about this volume in the attaching information. |
801c135c | 602 | */ |
dcd85fdd AB |
603 | struct ubi_ainf_volume *ubi_find_av(const struct ubi_attach_info *ai, |
604 | int vol_id) | |
801c135c | 605 | { |
517af48c | 606 | struct ubi_ainf_volume *av; |
a4e6042f | 607 | struct rb_node *p = ai->volumes.rb_node; |
801c135c AB |
608 | |
609 | while (p) { | |
517af48c | 610 | av = rb_entry(p, struct ubi_ainf_volume, rb); |
801c135c | 611 | |
517af48c AB |
612 | if (vol_id == av->vol_id) |
613 | return av; | |
801c135c | 614 | |
517af48c | 615 | if (vol_id > av->vol_id) |
801c135c AB |
616 | p = p->rb_left; |
617 | else | |
618 | p = p->rb_right; | |
619 | } | |
620 | ||
621 | return NULL; | |
622 | } | |
623 | ||
801c135c | 624 | /** |
d717dc2f | 625 | * ubi_remove_av - delete attaching information about a volume. |
a4e6042f | 626 | * @ai: attaching information |
517af48c | 627 | * @av: the volume attaching information to delete |
801c135c | 628 | */ |
d717dc2f | 629 | void ubi_remove_av(struct ubi_attach_info *ai, struct ubi_ainf_volume *av) |
801c135c AB |
630 | { |
631 | struct rb_node *rb; | |
2c5ec5ce | 632 | struct ubi_ainf_peb *aeb; |
801c135c | 633 | |
517af48c | 634 | dbg_bld("remove attaching information about volume %d", av->vol_id); |
801c135c | 635 | |
517af48c | 636 | while ((rb = rb_first(&av->root))) { |
2c5ec5ce | 637 | aeb = rb_entry(rb, struct ubi_ainf_peb, u.rb); |
517af48c | 638 | rb_erase(&aeb->u.rb, &av->root); |
a4e6042f | 639 | list_add_tail(&aeb->u.list, &ai->erase); |
801c135c AB |
640 | } |
641 | ||
517af48c AB |
642 | rb_erase(&av->rb, &ai->volumes); |
643 | kfree(av); | |
a4e6042f | 644 | ai->vols_found -= 1; |
801c135c AB |
645 | } |
646 | ||
647 | /** | |
13d33dad | 648 | * early_erase_peb - erase a physical eraseblock. |
801c135c | 649 | * @ubi: UBI device description object |
a4e6042f | 650 | * @ai: attaching information |
801c135c | 651 | * @pnum: physical eraseblock number to erase; |
9c47fb2f | 652 | * @ec: erase counter value to write (%UBI_UNKNOWN if it is unknown) |
801c135c AB |
653 | * |
654 | * This function erases physical eraseblock 'pnum', and writes the erase | |
655 | * counter header to it. This function should only be used on UBI device | |
85c6e6e2 AB |
656 | * initialization stages, when the EBA sub-system had not been yet initialized. |
657 | * This function returns zero in case of success and a negative error code in | |
658 | * case of failure. | |
801c135c | 659 | */ |
13d33dad AB |
660 | static int early_erase_peb(struct ubi_device *ubi, |
661 | const struct ubi_attach_info *ai, int pnum, int ec) | |
801c135c AB |
662 | { |
663 | int err; | |
664 | struct ubi_ec_hdr *ec_hdr; | |
665 | ||
801c135c AB |
666 | if ((long long)ec >= UBI_MAX_ERASECOUNTER) { |
667 | /* | |
668 | * Erase counter overflow. Upgrade UBI and use 64-bit | |
669 | * erase counters internally. | |
670 | */ | |
671 | ubi_err("erase counter overflow at PEB %d, EC %d", pnum, ec); | |
672 | return -EINVAL; | |
673 | } | |
674 | ||
dcec4c3b FM |
675 | ec_hdr = kzalloc(ubi->ec_hdr_alsize, GFP_KERNEL); |
676 | if (!ec_hdr) | |
677 | return -ENOMEM; | |
678 | ||
3261ebd7 | 679 | ec_hdr->ec = cpu_to_be64(ec); |
801c135c AB |
680 | |
681 | err = ubi_io_sync_erase(ubi, pnum, 0); | |
682 | if (err < 0) | |
683 | goto out_free; | |
684 | ||
685 | err = ubi_io_write_ec_hdr(ubi, pnum, ec_hdr); | |
686 | ||
687 | out_free: | |
688 | kfree(ec_hdr); | |
689 | return err; | |
690 | } | |
691 | ||
692 | /** | |
c87fbd7d | 693 | * ubi_early_get_peb - get a free physical eraseblock. |
801c135c | 694 | * @ubi: UBI device description object |
a4e6042f | 695 | * @ai: attaching information |
801c135c AB |
696 | * |
697 | * This function returns a free physical eraseblock. It is supposed to be | |
85c6e6e2 AB |
698 | * called on the UBI initialization stages when the wear-leveling sub-system is |
699 | * not initialized yet. This function picks a physical eraseblocks from one of | |
700 | * the lists, writes the EC header if it is needed, and removes it from the | |
701 | * list. | |
801c135c | 702 | * |
fbd0107f AB |
703 | * This function returns a pointer to the "aeb" of the found free PEB in case |
704 | * of success and an error code in case of failure. | |
801c135c | 705 | */ |
c87fbd7d AB |
706 | struct ubi_ainf_peb *ubi_early_get_peb(struct ubi_device *ubi, |
707 | struct ubi_attach_info *ai) | |
801c135c | 708 | { |
5fc01ab6 | 709 | int err = 0; |
2c5ec5ce | 710 | struct ubi_ainf_peb *aeb, *tmp_aeb; |
801c135c | 711 | |
a4e6042f AB |
712 | if (!list_empty(&ai->free)) { |
713 | aeb = list_entry(ai->free.next, struct ubi_ainf_peb, u.list); | |
2c5ec5ce AB |
714 | list_del(&aeb->u.list); |
715 | dbg_bld("return free PEB %d, EC %d", aeb->pnum, aeb->ec); | |
716 | return aeb; | |
801c135c AB |
717 | } |
718 | ||
5fc01ab6 AB |
719 | /* |
720 | * We try to erase the first physical eraseblock from the erase list | |
721 | * and pick it if we succeed, or try to erase the next one if not. And | |
722 | * so forth. We don't want to take care about bad eraseblocks here - | |
723 | * they'll be handled later. | |
724 | */ | |
a4e6042f | 725 | list_for_each_entry_safe(aeb, tmp_aeb, &ai->erase, u.list) { |
9c47fb2f | 726 | if (aeb->ec == UBI_UNKNOWN) |
a4e6042f | 727 | aeb->ec = ai->mean_ec; |
801c135c | 728 | |
13d33dad | 729 | err = early_erase_peb(ubi, ai, aeb->pnum, aeb->ec+1); |
5fc01ab6 AB |
730 | if (err) |
731 | continue; | |
801c135c | 732 | |
2c5ec5ce AB |
733 | aeb->ec += 1; |
734 | list_del(&aeb->u.list); | |
735 | dbg_bld("return PEB %d, EC %d", aeb->pnum, aeb->ec); | |
736 | return aeb; | |
801c135c AB |
737 | } |
738 | ||
5fc01ab6 | 739 | ubi_err("no free eraseblocks"); |
801c135c AB |
740 | return ERR_PTR(-ENOSPC); |
741 | } | |
742 | ||
feeba4b8 | 743 | /** |
45aafd32 | 744 | * check_corruption - check the data area of PEB. |
feeba4b8 | 745 | * @ubi: UBI device description object |
dac6e208 | 746 | * @vid_hdr: the (corrupted) VID header of this PEB |
feeba4b8 AB |
747 | * @pnum: the physical eraseblock number to check |
748 | * | |
749 | * This is a helper function which is used to distinguish between VID header | |
750 | * corruptions caused by power cuts and other reasons. If the PEB contains only | |
45aafd32 | 751 | * 0xFF bytes in the data area, the VID header is most probably corrupted |
feeba4b8 | 752 | * because of a power cut (%0 is returned in this case). Otherwise, it was |
45aafd32 AB |
753 | * probably corrupted for some other reasons (%1 is returned in this case). A |
754 | * negative error code is returned if a read error occurred. | |
feeba4b8 AB |
755 | * |
756 | * If the corruption reason was a power cut, UBI can safely erase this PEB. | |
757 | * Otherwise, it should preserve it to avoid possibly destroying important | |
758 | * information. | |
759 | */ | |
45aafd32 AB |
760 | static int check_corruption(struct ubi_device *ubi, struct ubi_vid_hdr *vid_hdr, |
761 | int pnum) | |
feeba4b8 AB |
762 | { |
763 | int err; | |
764 | ||
765 | mutex_lock(&ubi->buf_mutex); | |
0ca39d74 | 766 | memset(ubi->peb_buf, 0x00, ubi->leb_size); |
feeba4b8 | 767 | |
0ca39d74 | 768 | err = ubi_io_read(ubi, ubi->peb_buf, pnum, ubi->leb_start, |
feeba4b8 | 769 | ubi->leb_size); |
d57f4054 | 770 | if (err == UBI_IO_BITFLIPS || mtd_is_eccerr(err)) { |
45aafd32 AB |
771 | /* |
772 | * Bit-flips or integrity errors while reading the data area. | |
773 | * It is difficult to say for sure what type of corruption is | |
774 | * this, but presumably a power cut happened while this PEB was | |
775 | * erased, so it became unstable and corrupted, and should be | |
776 | * erased. | |
777 | */ | |
1b1d76e2 DC |
778 | err = 0; |
779 | goto out_unlock; | |
45aafd32 AB |
780 | } |
781 | ||
782 | if (err) | |
1b1d76e2 | 783 | goto out_unlock; |
feeba4b8 | 784 | |
0ca39d74 | 785 | if (ubi_check_pattern(ubi->peb_buf, 0xFF, ubi->leb_size)) |
1b1d76e2 | 786 | goto out_unlock; |
feeba4b8 | 787 | |
049333ce AB |
788 | ubi_err("PEB %d contains corrupted VID header, and the data does not contain all 0xFF", |
789 | pnum); | |
790 | ubi_err("this may be a non-UBI PEB or a severe VID header corruption which requires manual inspection"); | |
a904e3f1 | 791 | ubi_dump_vid_hdr(vid_hdr); |
719bb840 AB |
792 | pr_err("hexdump of PEB %d offset %d, length %d", |
793 | pnum, ubi->leb_start, ubi->leb_size); | |
feeba4b8 | 794 | ubi_dbg_print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_OFFSET, 32, 1, |
0ca39d74 | 795 | ubi->peb_buf, ubi->leb_size, 1); |
1b1d76e2 DC |
796 | err = 1; |
797 | ||
798 | out_unlock: | |
feeba4b8 | 799 | mutex_unlock(&ubi->buf_mutex); |
1b1d76e2 | 800 | return err; |
feeba4b8 AB |
801 | } |
802 | ||
801c135c | 803 | /** |
fbd0107f | 804 | * scan_peb - scan and process UBI headers of a PEB. |
801c135c | 805 | * @ubi: UBI device description object |
a4e6042f | 806 | * @ai: attaching information |
801c135c | 807 | * @pnum: the physical eraseblock number |
dac6e208 RW |
808 | * @vid: The volume ID of the found volume will be stored in this pointer |
809 | * @sqnum: The sqnum of the found volume will be stored in this pointer | |
801c135c | 810 | * |
fbd0107f AB |
811 | * This function reads UBI headers of PEB @pnum, checks them, and adds |
812 | * information about this PEB to the corresponding list or RB-tree in the | |
813 | * "attaching info" structure. Returns zero if the physical eraseblock was | |
814 | * successfully handled and a negative error code in case of failure. | |
801c135c | 815 | */ |
fbd0107f | 816 | static int scan_peb(struct ubi_device *ubi, struct ubi_attach_info *ai, |
dac6e208 | 817 | int pnum, int *vid, unsigned long long *sqnum) |
801c135c | 818 | { |
c18a8418 | 819 | long long uninitialized_var(ec); |
dac6e208 | 820 | int err, bitflips = 0, vol_id = -1, ec_err = 0; |
801c135c AB |
821 | |
822 | dbg_bld("scan PEB %d", pnum); | |
823 | ||
824 | /* Skip bad physical eraseblocks */ | |
825 | err = ubi_io_is_bad(ubi, pnum); | |
826 | if (err < 0) | |
827 | return err; | |
828 | else if (err) { | |
a4e6042f | 829 | ai->bad_peb_count += 1; |
801c135c AB |
830 | return 0; |
831 | } | |
832 | ||
833 | err = ubi_io_read_ec_hdr(ubi, pnum, ech, 0); | |
834 | if (err < 0) | |
835 | return err; | |
b3321508 AB |
836 | switch (err) { |
837 | case 0: | |
838 | break; | |
839 | case UBI_IO_BITFLIPS: | |
801c135c | 840 | bitflips = 1; |
b3321508 AB |
841 | break; |
842 | case UBI_IO_FF: | |
a4e6042f | 843 | ai->empty_peb_count += 1; |
6dd3bc7e JR |
844 | return add_to_list(ai, pnum, UBI_UNKNOWN, UBI_UNKNOWN, |
845 | UBI_UNKNOWN, 0, &ai->erase); | |
b3321508 | 846 | case UBI_IO_FF_BITFLIPS: |
a4e6042f | 847 | ai->empty_peb_count += 1; |
6dd3bc7e JR |
848 | return add_to_list(ai, pnum, UBI_UNKNOWN, UBI_UNKNOWN, |
849 | UBI_UNKNOWN, 1, &ai->erase); | |
b3321508 | 850 | case UBI_IO_BAD_HDR_EBADMSG: |
b3321508 | 851 | case UBI_IO_BAD_HDR: |
801c135c AB |
852 | /* |
853 | * We have to also look at the VID header, possibly it is not | |
854 | * corrupted. Set %bitflips flag in order to make this PEB be | |
855 | * moved and EC be re-created. | |
856 | */ | |
e0e718c2 | 857 | ec_err = err; |
9c47fb2f | 858 | ec = UBI_UNKNOWN; |
801c135c | 859 | bitflips = 1; |
b3321508 AB |
860 | break; |
861 | default: | |
862 | ubi_err("'ubi_io_read_ec_hdr()' returned unknown code %d", err); | |
863 | return -EINVAL; | |
801c135c AB |
864 | } |
865 | ||
e0e718c2 | 866 | if (!ec_err) { |
fe96efc1 AB |
867 | int image_seq; |
868 | ||
801c135c AB |
869 | /* Make sure UBI version is OK */ |
870 | if (ech->version != UBI_VERSION) { | |
871 | ubi_err("this UBI version is %d, image version is %d", | |
872 | UBI_VERSION, (int)ech->version); | |
873 | return -EINVAL; | |
874 | } | |
875 | ||
3261ebd7 | 876 | ec = be64_to_cpu(ech->ec); |
801c135c AB |
877 | if (ec > UBI_MAX_ERASECOUNTER) { |
878 | /* | |
879 | * Erase counter overflow. The EC headers have 64 bits | |
880 | * reserved, but we anyway make use of only 31 bit | |
881 | * values, as this seems to be enough for any existing | |
882 | * flash. Upgrade UBI and use 64-bit erase counters | |
883 | * internally. | |
884 | */ | |
885 | ubi_err("erase counter overflow, max is %d", | |
886 | UBI_MAX_ERASECOUNTER); | |
a904e3f1 | 887 | ubi_dump_ec_hdr(ech); |
801c135c AB |
888 | return -EINVAL; |
889 | } | |
fe96efc1 | 890 | |
32bc4820 AH |
891 | /* |
892 | * Make sure that all PEBs have the same image sequence number. | |
893 | * This allows us to detect situations when users flash UBI | |
894 | * images incorrectly, so that the flash has the new UBI image | |
895 | * and leftovers from the old one. This feature was added | |
896 | * relatively recently, and the sequence number was always | |
897 | * zero, because old UBI implementations always set it to zero. | |
898 | * For this reasons, we do not panic if some PEBs have zero | |
899 | * sequence number, while other PEBs have non-zero sequence | |
900 | * number. | |
901 | */ | |
3dc948da | 902 | image_seq = be32_to_cpu(ech->image_seq); |
55b80c40 | 903 | if (!ubi->image_seq) |
fe96efc1 | 904 | ubi->image_seq = image_seq; |
55b80c40 | 905 | if (image_seq && ubi->image_seq != image_seq) { |
049333ce AB |
906 | ubi_err("bad image sequence number %d in PEB %d, expected %d", |
907 | image_seq, pnum, ubi->image_seq); | |
a904e3f1 | 908 | ubi_dump_ec_hdr(ech); |
fe96efc1 AB |
909 | return -EINVAL; |
910 | } | |
801c135c AB |
911 | } |
912 | ||
913 | /* OK, we've done with the EC header, let's look at the VID header */ | |
914 | ||
915 | err = ubi_io_read_vid_hdr(ubi, pnum, vidh, 0); | |
916 | if (err < 0) | |
917 | return err; | |
b3321508 AB |
918 | switch (err) { |
919 | case 0: | |
920 | break; | |
921 | case UBI_IO_BITFLIPS: | |
801c135c | 922 | bitflips = 1; |
b3321508 AB |
923 | break; |
924 | case UBI_IO_BAD_HDR_EBADMSG: | |
0525dac9 AB |
925 | if (ec_err == UBI_IO_BAD_HDR_EBADMSG) |
926 | /* | |
927 | * Both EC and VID headers are corrupted and were read | |
928 | * with data integrity error, probably this is a bad | |
929 | * PEB, bit it is not marked as bad yet. This may also | |
930 | * be a result of power cut during erasure. | |
931 | */ | |
a4e6042f | 932 | ai->maybe_bad_peb_count += 1; |
b3321508 | 933 | case UBI_IO_BAD_HDR: |
feeba4b8 AB |
934 | if (ec_err) |
935 | /* | |
936 | * Both headers are corrupted. There is a possibility | |
937 | * that this a valid UBI PEB which has corresponding | |
938 | * LEB, but the headers are corrupted. However, it is | |
939 | * impossible to distinguish it from a PEB which just | |
45aafd32 | 940 | * contains garbage because of a power cut during erase |
feeba4b8 | 941 | * operation. So we just schedule this PEB for erasure. |
7ac760c2 | 942 | * |
25985edc | 943 | * Besides, in case of NOR flash, we deliberately |
7ac760c2 AB |
944 | * corrupt both headers because NOR flash erasure is |
945 | * slow and can start from the end. | |
feeba4b8 AB |
946 | */ |
947 | err = 0; | |
948 | else | |
949 | /* | |
950 | * The EC was OK, but the VID header is corrupted. We | |
951 | * have to check what is in the data area. | |
952 | */ | |
45aafd32 | 953 | err = check_corruption(ubi, vidh, pnum); |
df3fca4c AB |
954 | |
955 | if (err < 0) | |
956 | return err; | |
957 | else if (!err) | |
feeba4b8 | 958 | /* This corruption is caused by a power cut */ |
6dd3bc7e JR |
959 | err = add_to_list(ai, pnum, UBI_UNKNOWN, |
960 | UBI_UNKNOWN, ec, 1, &ai->erase); | |
feeba4b8 AB |
961 | else |
962 | /* This is an unexpected corruption */ | |
a4e6042f | 963 | err = add_corrupted(ai, pnum, ec); |
feeba4b8 AB |
964 | if (err) |
965 | return err; | |
966 | goto adjust_mean_ec; | |
b3321508 | 967 | case UBI_IO_FF_BITFLIPS: |
6dd3bc7e JR |
968 | err = add_to_list(ai, pnum, UBI_UNKNOWN, UBI_UNKNOWN, |
969 | ec, 1, &ai->erase); | |
801c135c AB |
970 | if (err) |
971 | return err; | |
972 | goto adjust_mean_ec; | |
b3321508 | 973 | case UBI_IO_FF: |
193819cf | 974 | if (ec_err || bitflips) |
6dd3bc7e JR |
975 | err = add_to_list(ai, pnum, UBI_UNKNOWN, |
976 | UBI_UNKNOWN, ec, 1, &ai->erase); | |
b3321508 | 977 | else |
6dd3bc7e JR |
978 | err = add_to_list(ai, pnum, UBI_UNKNOWN, |
979 | UBI_UNKNOWN, ec, 0, &ai->free); | |
801c135c AB |
980 | if (err) |
981 | return err; | |
982 | goto adjust_mean_ec; | |
b3321508 AB |
983 | default: |
984 | ubi_err("'ubi_io_read_vid_hdr()' returned unknown code %d", | |
985 | err); | |
986 | return -EINVAL; | |
801c135c AB |
987 | } |
988 | ||
3261ebd7 | 989 | vol_id = be32_to_cpu(vidh->vol_id); |
dac6e208 RW |
990 | if (vid) |
991 | *vid = vol_id; | |
992 | if (sqnum) | |
993 | *sqnum = be64_to_cpu(vidh->sqnum); | |
91f2d53c | 994 | if (vol_id > UBI_MAX_VOLUMES && vol_id != UBI_LAYOUT_VOLUME_ID) { |
3261ebd7 | 995 | int lnum = be32_to_cpu(vidh->lnum); |
801c135c AB |
996 | |
997 | /* Unsupported internal volume */ | |
998 | switch (vidh->compat) { | |
999 | case UBI_COMPAT_DELETE: | |
dac6e208 RW |
1000 | if (vol_id != UBI_FM_SB_VOLUME_ID |
1001 | && vol_id != UBI_FM_DATA_VOLUME_ID) { | |
1002 | ubi_msg("\"delete\" compatible internal volume %d:%d found, will remove it", | |
1003 | vol_id, lnum); | |
1004 | } | |
6dd3bc7e JR |
1005 | err = add_to_list(ai, pnum, vol_id, lnum, |
1006 | ec, 1, &ai->erase); | |
801c135c AB |
1007 | if (err) |
1008 | return err; | |
158132c9 | 1009 | return 0; |
801c135c AB |
1010 | |
1011 | case UBI_COMPAT_RO: | |
049333ce | 1012 | ubi_msg("read-only compatible internal volume %d:%d found, switch to read-only mode", |
801c135c AB |
1013 | vol_id, lnum); |
1014 | ubi->ro_mode = 1; | |
1015 | break; | |
1016 | ||
1017 | case UBI_COMPAT_PRESERVE: | |
049333ce AB |
1018 | ubi_msg("\"preserve\" compatible internal volume %d:%d found", |
1019 | vol_id, lnum); | |
6dd3bc7e JR |
1020 | err = add_to_list(ai, pnum, vol_id, lnum, |
1021 | ec, 0, &ai->alien); | |
801c135c AB |
1022 | if (err) |
1023 | return err; | |
801c135c AB |
1024 | return 0; |
1025 | ||
1026 | case UBI_COMPAT_REJECT: | |
1027 | ubi_err("incompatible internal volume %d:%d found", | |
1028 | vol_id, lnum); | |
1029 | return -EINVAL; | |
1030 | } | |
1031 | } | |
1032 | ||
e0e718c2 | 1033 | if (ec_err) |
29a88c99 AB |
1034 | ubi_warn("valid VID header but corrupted EC header at PEB %d", |
1035 | pnum); | |
3561188a | 1036 | err = ubi_add_to_av(ubi, ai, pnum, ec, vidh, bitflips); |
801c135c AB |
1037 | if (err) |
1038 | return err; | |
1039 | ||
1040 | adjust_mean_ec: | |
e0e718c2 | 1041 | if (!ec_err) { |
a4e6042f AB |
1042 | ai->ec_sum += ec; |
1043 | ai->ec_count += 1; | |
1044 | if (ec > ai->max_ec) | |
1045 | ai->max_ec = ec; | |
1046 | if (ec < ai->min_ec) | |
1047 | ai->min_ec = ec; | |
801c135c AB |
1048 | } |
1049 | ||
1050 | return 0; | |
1051 | } | |
1052 | ||
0798cea8 | 1053 | /** |
fbd0107f | 1054 | * late_analysis - analyze the overall situation with PEB. |
0798cea8 | 1055 | * @ubi: UBI device description object |
a4e6042f | 1056 | * @ai: attaching information |
0798cea8 | 1057 | * |
fbd0107f AB |
1058 | * This is a helper function which takes a look what PEBs we have after we |
1059 | * gather information about all of them ("ai" is compete). It decides whether | |
1060 | * the flash is empty and should be formatted of whether there are too many | |
1061 | * corrupted PEBs and we should not attach this MTD device. Returns zero if we | |
1062 | * should proceed with attaching the MTD device, and %-EINVAL if we should not. | |
0798cea8 | 1063 | */ |
fbd0107f | 1064 | static int late_analysis(struct ubi_device *ubi, struct ubi_attach_info *ai) |
0798cea8 | 1065 | { |
2c5ec5ce | 1066 | struct ubi_ainf_peb *aeb; |
0525dac9 | 1067 | int max_corr, peb_count; |
0798cea8 | 1068 | |
a4e6042f | 1069 | peb_count = ubi->peb_count - ai->bad_peb_count - ai->alien_peb_count; |
0525dac9 | 1070 | max_corr = peb_count / 20 ?: 8; |
0798cea8 AB |
1071 | |
1072 | /* | |
0525dac9 | 1073 | * Few corrupted PEBs is not a problem and may be just a result of |
0798cea8 AB |
1074 | * unclean reboots. However, many of them may indicate some problems |
1075 | * with the flash HW or driver. | |
1076 | */ | |
a4e6042f | 1077 | if (ai->corr_peb_count) { |
0525dac9 | 1078 | ubi_err("%d PEBs are corrupted and preserved", |
a4e6042f | 1079 | ai->corr_peb_count); |
e28453bb | 1080 | pr_err("Corrupted PEBs are:"); |
a4e6042f | 1081 | list_for_each_entry(aeb, &ai->corr, u.list) |
e28453bb AB |
1082 | pr_cont(" %d", aeb->pnum); |
1083 | pr_cont("\n"); | |
0798cea8 AB |
1084 | |
1085 | /* | |
1086 | * If too many PEBs are corrupted, we refuse attaching, | |
1087 | * otherwise, only print a warning. | |
1088 | */ | |
a4e6042f | 1089 | if (ai->corr_peb_count >= max_corr) { |
feddbb34 | 1090 | ubi_err("too many corrupted PEBs, refusing"); |
0798cea8 AB |
1091 | return -EINVAL; |
1092 | } | |
1093 | } | |
1094 | ||
a4e6042f | 1095 | if (ai->empty_peb_count + ai->maybe_bad_peb_count == peb_count) { |
0525dac9 AB |
1096 | /* |
1097 | * All PEBs are empty, or almost all - a couple PEBs look like | |
1098 | * they may be bad PEBs which were not marked as bad yet. | |
1099 | * | |
1100 | * This piece of code basically tries to distinguish between | |
1101 | * the following situations: | |
1102 | * | |
1103 | * 1. Flash is empty, but there are few bad PEBs, which are not | |
1104 | * marked as bad so far, and which were read with error. We | |
1105 | * want to go ahead and format this flash. While formatting, | |
1106 | * the faulty PEBs will probably be marked as bad. | |
1107 | * | |
1108 | * 2. Flash contains non-UBI data and we do not want to format | |
1109 | * it and destroy possibly important information. | |
1110 | */ | |
a4e6042f AB |
1111 | if (ai->maybe_bad_peb_count <= 2) { |
1112 | ai->is_empty = 1; | |
0798cea8 | 1113 | ubi_msg("empty MTD device detected"); |
0525dac9 AB |
1114 | get_random_bytes(&ubi->image_seq, |
1115 | sizeof(ubi->image_seq)); | |
0798cea8 | 1116 | } else { |
049333ce | 1117 | ubi_err("MTD device is not UBI-formatted and possibly contains non-UBI data - refusing it"); |
0798cea8 AB |
1118 | return -EINVAL; |
1119 | } | |
0525dac9 | 1120 | |
0798cea8 AB |
1121 | } |
1122 | ||
0798cea8 AB |
1123 | return 0; |
1124 | } | |
1125 | ||
dac6e208 RW |
1126 | /** |
1127 | * destroy_av - free volume attaching information. | |
1128 | * @av: volume attaching information | |
1129 | * @ai: attaching information | |
1130 | * | |
1131 | * This function destroys the volume attaching information. | |
1132 | */ | |
1133 | static void destroy_av(struct ubi_attach_info *ai, struct ubi_ainf_volume *av) | |
1134 | { | |
1135 | struct ubi_ainf_peb *aeb; | |
1136 | struct rb_node *this = av->root.rb_node; | |
1137 | ||
1138 | while (this) { | |
1139 | if (this->rb_left) | |
1140 | this = this->rb_left; | |
1141 | else if (this->rb_right) | |
1142 | this = this->rb_right; | |
1143 | else { | |
1144 | aeb = rb_entry(this, struct ubi_ainf_peb, u.rb); | |
1145 | this = rb_parent(this); | |
1146 | if (this) { | |
1147 | if (this->rb_left == &aeb->u.rb) | |
1148 | this->rb_left = NULL; | |
1149 | else | |
1150 | this->rb_right = NULL; | |
1151 | } | |
1152 | ||
1153 | kmem_cache_free(ai->aeb_slab_cache, aeb); | |
1154 | } | |
1155 | } | |
1156 | kfree(av); | |
1157 | } | |
1158 | ||
1159 | /** | |
1160 | * destroy_ai - destroy attaching information. | |
1161 | * @ai: attaching information | |
1162 | */ | |
1163 | static void destroy_ai(struct ubi_attach_info *ai) | |
1164 | { | |
1165 | struct ubi_ainf_peb *aeb, *aeb_tmp; | |
1166 | struct ubi_ainf_volume *av; | |
1167 | struct rb_node *rb; | |
1168 | ||
1169 | list_for_each_entry_safe(aeb, aeb_tmp, &ai->alien, u.list) { | |
1170 | list_del(&aeb->u.list); | |
1171 | kmem_cache_free(ai->aeb_slab_cache, aeb); | |
1172 | } | |
1173 | list_for_each_entry_safe(aeb, aeb_tmp, &ai->erase, u.list) { | |
1174 | list_del(&aeb->u.list); | |
1175 | kmem_cache_free(ai->aeb_slab_cache, aeb); | |
1176 | } | |
1177 | list_for_each_entry_safe(aeb, aeb_tmp, &ai->corr, u.list) { | |
1178 | list_del(&aeb->u.list); | |
1179 | kmem_cache_free(ai->aeb_slab_cache, aeb); | |
1180 | } | |
1181 | list_for_each_entry_safe(aeb, aeb_tmp, &ai->free, u.list) { | |
1182 | list_del(&aeb->u.list); | |
1183 | kmem_cache_free(ai->aeb_slab_cache, aeb); | |
1184 | } | |
1185 | ||
1186 | /* Destroy the volume RB-tree */ | |
1187 | rb = ai->volumes.rb_node; | |
1188 | while (rb) { | |
1189 | if (rb->rb_left) | |
1190 | rb = rb->rb_left; | |
1191 | else if (rb->rb_right) | |
1192 | rb = rb->rb_right; | |
1193 | else { | |
1194 | av = rb_entry(rb, struct ubi_ainf_volume, rb); | |
1195 | ||
1196 | rb = rb_parent(rb); | |
1197 | if (rb) { | |
1198 | if (rb->rb_left == &av->rb) | |
1199 | rb->rb_left = NULL; | |
1200 | else | |
1201 | rb->rb_right = NULL; | |
1202 | } | |
1203 | ||
1204 | destroy_av(ai, av); | |
1205 | } | |
1206 | } | |
1207 | ||
1208 | if (ai->aeb_slab_cache) | |
1209 | kmem_cache_destroy(ai->aeb_slab_cache); | |
1210 | ||
1211 | kfree(ai); | |
1212 | } | |
1213 | ||
801c135c | 1214 | /** |
47e1ec70 | 1215 | * scan_all - scan entire MTD device. |
801c135c | 1216 | * @ubi: UBI device description object |
dac6e208 RW |
1217 | * @ai: attach info object |
1218 | * @start: start scanning at this PEB | |
801c135c AB |
1219 | * |
1220 | * This function does full scanning of an MTD device and returns complete | |
fbd0107f AB |
1221 | * information about it in form of a "struct ubi_attach_info" object. In case |
1222 | * of failure, an error code is returned. | |
801c135c | 1223 | */ |
dac6e208 RW |
1224 | static int scan_all(struct ubi_device *ubi, struct ubi_attach_info *ai, |
1225 | int start) | |
801c135c AB |
1226 | { |
1227 | int err, pnum; | |
1228 | struct rb_node *rb1, *rb2; | |
517af48c | 1229 | struct ubi_ainf_volume *av; |
2c5ec5ce | 1230 | struct ubi_ainf_peb *aeb; |
801c135c AB |
1231 | |
1232 | err = -ENOMEM; | |
6c1e875c | 1233 | |
801c135c AB |
1234 | ech = kzalloc(ubi->ec_hdr_alsize, GFP_KERNEL); |
1235 | if (!ech) | |
dac6e208 | 1236 | return err; |
801c135c | 1237 | |
33818bbb | 1238 | vidh = ubi_zalloc_vid_hdr(ubi, GFP_KERNEL); |
801c135c AB |
1239 | if (!vidh) |
1240 | goto out_ech; | |
1241 | ||
dac6e208 | 1242 | for (pnum = start; pnum < ubi->peb_count; pnum++) { |
801c135c AB |
1243 | cond_resched(); |
1244 | ||
c8566350 | 1245 | dbg_gen("process PEB %d", pnum); |
dac6e208 | 1246 | err = scan_peb(ubi, ai, pnum, NULL, NULL); |
801c135c AB |
1247 | if (err < 0) |
1248 | goto out_vidh; | |
1249 | } | |
1250 | ||
719bb840 | 1251 | ubi_msg("scanning is finished"); |
801c135c | 1252 | |
4bc1dca4 | 1253 | /* Calculate mean erase counter */ |
a4e6042f AB |
1254 | if (ai->ec_count) |
1255 | ai->mean_ec = div_u64(ai->ec_sum, ai->ec_count); | |
801c135c | 1256 | |
fbd0107f | 1257 | err = late_analysis(ubi, ai); |
0798cea8 AB |
1258 | if (err) |
1259 | goto out_vidh; | |
4a406856 | 1260 | |
801c135c AB |
1261 | /* |
1262 | * In case of unknown erase counter we use the mean erase counter | |
1263 | * value. | |
1264 | */ | |
517af48c AB |
1265 | ubi_rb_for_each_entry(rb1, av, &ai->volumes, rb) { |
1266 | ubi_rb_for_each_entry(rb2, aeb, &av->root, u.rb) | |
9c47fb2f | 1267 | if (aeb->ec == UBI_UNKNOWN) |
a4e6042f | 1268 | aeb->ec = ai->mean_ec; |
801c135c AB |
1269 | } |
1270 | ||
a4e6042f | 1271 | list_for_each_entry(aeb, &ai->free, u.list) { |
9c47fb2f | 1272 | if (aeb->ec == UBI_UNKNOWN) |
a4e6042f | 1273 | aeb->ec = ai->mean_ec; |
801c135c AB |
1274 | } |
1275 | ||
a4e6042f | 1276 | list_for_each_entry(aeb, &ai->corr, u.list) |
9c47fb2f | 1277 | if (aeb->ec == UBI_UNKNOWN) |
a4e6042f | 1278 | aeb->ec = ai->mean_ec; |
801c135c | 1279 | |
a4e6042f | 1280 | list_for_each_entry(aeb, &ai->erase, u.list) |
9c47fb2f | 1281 | if (aeb->ec == UBI_UNKNOWN) |
a4e6042f | 1282 | aeb->ec = ai->mean_ec; |
801c135c | 1283 | |
a4e6042f | 1284 | err = self_check_ai(ubi, ai); |
adbf05e3 | 1285 | if (err) |
801c135c | 1286 | goto out_vidh; |
801c135c AB |
1287 | |
1288 | ubi_free_vid_hdr(ubi, vidh); | |
1289 | kfree(ech); | |
1290 | ||
dac6e208 | 1291 | return 0; |
801c135c AB |
1292 | |
1293 | out_vidh: | |
1294 | ubi_free_vid_hdr(ubi, vidh); | |
1295 | out_ech: | |
1296 | kfree(ech); | |
dac6e208 RW |
1297 | return err; |
1298 | } | |
1299 | ||
1300 | #ifdef CONFIG_MTD_UBI_FASTMAP | |
1301 | ||
1302 | /** | |
1303 | * scan_fastmap - try to find a fastmap and attach from it. | |
1304 | * @ubi: UBI device description object | |
1305 | * @ai: attach info object | |
1306 | * | |
1307 | * Returns 0 on success, negative return values indicate an internal | |
1308 | * error. | |
1309 | * UBI_NO_FASTMAP denotes that no fastmap was found. | |
1310 | * UBI_BAD_FASTMAP denotes that the found fastmap was invalid. | |
1311 | */ | |
1312 | static int scan_fast(struct ubi_device *ubi, struct ubi_attach_info *ai) | |
1313 | { | |
1314 | int err, pnum, fm_anchor = -1; | |
1315 | unsigned long long max_sqnum = 0; | |
1316 | ||
1317 | err = -ENOMEM; | |
1318 | ||
1319 | ech = kzalloc(ubi->ec_hdr_alsize, GFP_KERNEL); | |
1320 | if (!ech) | |
1321 | goto out; | |
1322 | ||
1323 | vidh = ubi_zalloc_vid_hdr(ubi, GFP_KERNEL); | |
1324 | if (!vidh) | |
1325 | goto out_ech; | |
1326 | ||
1327 | for (pnum = 0; pnum < UBI_FM_MAX_START; pnum++) { | |
1328 | int vol_id = -1; | |
1329 | unsigned long long sqnum = -1; | |
1330 | cond_resched(); | |
1331 | ||
1332 | dbg_gen("process PEB %d", pnum); | |
1333 | err = scan_peb(ubi, ai, pnum, &vol_id, &sqnum); | |
1334 | if (err < 0) | |
1335 | goto out_vidh; | |
1336 | ||
1337 | if (vol_id == UBI_FM_SB_VOLUME_ID && sqnum > max_sqnum) { | |
1338 | max_sqnum = sqnum; | |
1339 | fm_anchor = pnum; | |
1340 | } | |
1341 | } | |
1342 | ||
1343 | ubi_free_vid_hdr(ubi, vidh); | |
1344 | kfree(ech); | |
1345 | ||
1346 | if (fm_anchor < 0) | |
1347 | return UBI_NO_FASTMAP; | |
1348 | ||
1349 | return ubi_scan_fastmap(ubi, ai, fm_anchor); | |
1350 | ||
1351 | out_vidh: | |
1352 | ubi_free_vid_hdr(ubi, vidh); | |
1353 | out_ech: | |
1354 | kfree(ech); | |
1355 | out: | |
1356 | return err; | |
1357 | } | |
1358 | ||
1359 | #endif | |
1360 | ||
1361 | static struct ubi_attach_info *alloc_ai(const char *slab_name) | |
1362 | { | |
1363 | struct ubi_attach_info *ai; | |
1364 | ||
1365 | ai = kzalloc(sizeof(struct ubi_attach_info), GFP_KERNEL); | |
1366 | if (!ai) | |
1367 | return ai; | |
1368 | ||
1369 | INIT_LIST_HEAD(&ai->corr); | |
1370 | INIT_LIST_HEAD(&ai->free); | |
1371 | INIT_LIST_HEAD(&ai->erase); | |
1372 | INIT_LIST_HEAD(&ai->alien); | |
1373 | ai->volumes = RB_ROOT; | |
1374 | ai->aeb_slab_cache = kmem_cache_create(slab_name, | |
1375 | sizeof(struct ubi_ainf_peb), | |
1376 | 0, 0, NULL); | |
1377 | if (!ai->aeb_slab_cache) { | |
1378 | kfree(ai); | |
1379 | ai = NULL; | |
1380 | } | |
1381 | ||
1382 | return ai; | |
801c135c AB |
1383 | } |
1384 | ||
47e1ec70 AB |
1385 | /** |
1386 | * ubi_attach - attach an MTD device. | |
1387 | * @ubi: UBI device descriptor | |
dac6e208 | 1388 | * @force_scan: if set to non-zero attach by scanning |
47e1ec70 AB |
1389 | * |
1390 | * This function returns zero in case of success and a negative error code in | |
1391 | * case of failure. | |
1392 | */ | |
dac6e208 | 1393 | int ubi_attach(struct ubi_device *ubi, int force_scan) |
47e1ec70 AB |
1394 | { |
1395 | int err; | |
1396 | struct ubi_attach_info *ai; | |
1397 | ||
dac6e208 RW |
1398 | ai = alloc_ai("ubi_aeb_slab_cache"); |
1399 | if (!ai) | |
1400 | return -ENOMEM; | |
1401 | ||
1402 | #ifdef CONFIG_MTD_UBI_FASTMAP | |
1403 | /* On small flash devices we disable fastmap in any case. */ | |
1404 | if ((int)mtd_div_by_eb(ubi->mtd->size, ubi->mtd) <= UBI_FM_MAX_START) { | |
1405 | ubi->fm_disabled = 1; | |
1406 | force_scan = 1; | |
1407 | } | |
1408 | ||
1409 | if (force_scan) | |
1410 | err = scan_all(ubi, ai, 0); | |
1411 | else { | |
1412 | err = scan_fast(ubi, ai); | |
1413 | if (err > 0) { | |
1414 | if (err != UBI_NO_FASTMAP) { | |
1415 | destroy_ai(ai); | |
1416 | ai = alloc_ai("ubi_aeb_slab_cache2"); | |
1417 | if (!ai) | |
1418 | return -ENOMEM; | |
dac6e208 | 1419 | |
4b3e0a25 RW |
1420 | err = scan_all(ubi, ai, 0); |
1421 | } else { | |
1422 | err = scan_all(ubi, ai, UBI_FM_MAX_START); | |
1423 | } | |
dac6e208 RW |
1424 | } |
1425 | } | |
1426 | #else | |
1427 | err = scan_all(ubi, ai, 0); | |
1428 | #endif | |
1429 | if (err) | |
1430 | goto out_ai; | |
47e1ec70 AB |
1431 | |
1432 | ubi->bad_peb_count = ai->bad_peb_count; | |
1433 | ubi->good_peb_count = ubi->peb_count - ubi->bad_peb_count; | |
1434 | ubi->corr_peb_count = ai->corr_peb_count; | |
1435 | ubi->max_ec = ai->max_ec; | |
1436 | ubi->mean_ec = ai->mean_ec; | |
719bb840 | 1437 | dbg_gen("max. sequence number: %llu", ai->max_sqnum); |
47e1ec70 AB |
1438 | |
1439 | err = ubi_read_volume_table(ubi, ai); | |
1440 | if (err) | |
1441 | goto out_ai; | |
1442 | ||
1443 | err = ubi_wl_init(ubi, ai); | |
1444 | if (err) | |
1445 | goto out_vtbl; | |
1446 | ||
1447 | err = ubi_eba_init(ubi, ai); | |
1448 | if (err) | |
1449 | goto out_wl; | |
1450 | ||
dac6e208 | 1451 | #ifdef CONFIG_MTD_UBI_FASTMAP |
64575574 | 1452 | if (ubi->fm && ubi_dbg_chk_gen(ubi)) { |
dac6e208 RW |
1453 | struct ubi_attach_info *scan_ai; |
1454 | ||
1455 | scan_ai = alloc_ai("ubi_ckh_aeb_slab_cache"); | |
1456 | if (!scan_ai) | |
1457 | goto out_wl; | |
1458 | ||
1459 | err = scan_all(ubi, scan_ai, 0); | |
1460 | if (err) { | |
1461 | destroy_ai(scan_ai); | |
1462 | goto out_wl; | |
1463 | } | |
1464 | ||
1465 | err = self_check_eba(ubi, ai, scan_ai); | |
1466 | destroy_ai(scan_ai); | |
1467 | ||
1468 | if (err) | |
1469 | goto out_wl; | |
1470 | } | |
1471 | #endif | |
1472 | ||
1473 | destroy_ai(ai); | |
47e1ec70 AB |
1474 | return 0; |
1475 | ||
1476 | out_wl: | |
1477 | ubi_wl_close(ubi); | |
1478 | out_vtbl: | |
1479 | ubi_free_internal_volumes(ubi); | |
1480 | vfree(ubi->vtbl); | |
1481 | out_ai: | |
dac6e208 | 1482 | destroy_ai(ai); |
47e1ec70 AB |
1483 | return err; |
1484 | } | |
1485 | ||
801c135c | 1486 | /** |
a4e6042f | 1487 | * self_check_ai - check the attaching information. |
801c135c | 1488 | * @ubi: UBI device description object |
a4e6042f | 1489 | * @ai: attaching information |
801c135c | 1490 | * |
a4e6042f | 1491 | * This function returns zero if the attaching information is all right, and a |
adbf05e3 | 1492 | * negative error code if not or if an error occurred. |
801c135c | 1493 | */ |
a4e6042f | 1494 | static int self_check_ai(struct ubi_device *ubi, struct ubi_attach_info *ai) |
801c135c AB |
1495 | { |
1496 | int pnum, err, vols_found = 0; | |
1497 | struct rb_node *rb1, *rb2; | |
517af48c | 1498 | struct ubi_ainf_volume *av; |
2c5ec5ce | 1499 | struct ubi_ainf_peb *aeb, *last_aeb; |
801c135c AB |
1500 | uint8_t *buf; |
1501 | ||
64575574 | 1502 | if (!ubi_dbg_chk_gen(ubi)) |
92d124f5 AB |
1503 | return 0; |
1504 | ||
801c135c | 1505 | /* |
a4e6042f | 1506 | * At first, check that attaching information is OK. |
801c135c | 1507 | */ |
517af48c | 1508 | ubi_rb_for_each_entry(rb1, av, &ai->volumes, rb) { |
801c135c AB |
1509 | int leb_count = 0; |
1510 | ||
1511 | cond_resched(); | |
1512 | ||
1513 | vols_found += 1; | |
1514 | ||
a4e6042f | 1515 | if (ai->is_empty) { |
801c135c | 1516 | ubi_err("bad is_empty flag"); |
517af48c | 1517 | goto bad_av; |
801c135c AB |
1518 | } |
1519 | ||
517af48c AB |
1520 | if (av->vol_id < 0 || av->highest_lnum < 0 || |
1521 | av->leb_count < 0 || av->vol_type < 0 || av->used_ebs < 0 || | |
1522 | av->data_pad < 0 || av->last_data_size < 0) { | |
801c135c | 1523 | ubi_err("negative values"); |
517af48c | 1524 | goto bad_av; |
801c135c AB |
1525 | } |
1526 | ||
517af48c AB |
1527 | if (av->vol_id >= UBI_MAX_VOLUMES && |
1528 | av->vol_id < UBI_INTERNAL_VOL_START) { | |
801c135c | 1529 | ubi_err("bad vol_id"); |
517af48c | 1530 | goto bad_av; |
801c135c AB |
1531 | } |
1532 | ||
517af48c | 1533 | if (av->vol_id > ai->highest_vol_id) { |
801c135c | 1534 | ubi_err("highest_vol_id is %d, but vol_id %d is there", |
517af48c | 1535 | ai->highest_vol_id, av->vol_id); |
801c135c AB |
1536 | goto out; |
1537 | } | |
1538 | ||
517af48c AB |
1539 | if (av->vol_type != UBI_DYNAMIC_VOLUME && |
1540 | av->vol_type != UBI_STATIC_VOLUME) { | |
801c135c | 1541 | ubi_err("bad vol_type"); |
517af48c | 1542 | goto bad_av; |
801c135c AB |
1543 | } |
1544 | ||
517af48c | 1545 | if (av->data_pad > ubi->leb_size / 2) { |
801c135c | 1546 | ubi_err("bad data_pad"); |
517af48c | 1547 | goto bad_av; |
801c135c AB |
1548 | } |
1549 | ||
2c5ec5ce | 1550 | last_aeb = NULL; |
517af48c | 1551 | ubi_rb_for_each_entry(rb2, aeb, &av->root, u.rb) { |
801c135c AB |
1552 | cond_resched(); |
1553 | ||
2c5ec5ce | 1554 | last_aeb = aeb; |
801c135c AB |
1555 | leb_count += 1; |
1556 | ||
2c5ec5ce | 1557 | if (aeb->pnum < 0 || aeb->ec < 0) { |
801c135c | 1558 | ubi_err("negative values"); |
2c5ec5ce | 1559 | goto bad_aeb; |
801c135c AB |
1560 | } |
1561 | ||
a4e6042f AB |
1562 | if (aeb->ec < ai->min_ec) { |
1563 | ubi_err("bad ai->min_ec (%d), %d found", | |
1564 | ai->min_ec, aeb->ec); | |
2c5ec5ce | 1565 | goto bad_aeb; |
801c135c AB |
1566 | } |
1567 | ||
a4e6042f AB |
1568 | if (aeb->ec > ai->max_ec) { |
1569 | ubi_err("bad ai->max_ec (%d), %d found", | |
1570 | ai->max_ec, aeb->ec); | |
2c5ec5ce | 1571 | goto bad_aeb; |
801c135c AB |
1572 | } |
1573 | ||
2c5ec5ce | 1574 | if (aeb->pnum >= ubi->peb_count) { |
801c135c | 1575 | ubi_err("too high PEB number %d, total PEBs %d", |
2c5ec5ce AB |
1576 | aeb->pnum, ubi->peb_count); |
1577 | goto bad_aeb; | |
801c135c AB |
1578 | } |
1579 | ||
517af48c AB |
1580 | if (av->vol_type == UBI_STATIC_VOLUME) { |
1581 | if (aeb->lnum >= av->used_ebs) { | |
801c135c | 1582 | ubi_err("bad lnum or used_ebs"); |
2c5ec5ce | 1583 | goto bad_aeb; |
801c135c AB |
1584 | } |
1585 | } else { | |
517af48c | 1586 | if (av->used_ebs != 0) { |
801c135c | 1587 | ubi_err("non-zero used_ebs"); |
2c5ec5ce | 1588 | goto bad_aeb; |
801c135c AB |
1589 | } |
1590 | } | |
1591 | ||
517af48c | 1592 | if (aeb->lnum > av->highest_lnum) { |
801c135c | 1593 | ubi_err("incorrect highest_lnum or lnum"); |
2c5ec5ce | 1594 | goto bad_aeb; |
801c135c AB |
1595 | } |
1596 | } | |
1597 | ||
517af48c | 1598 | if (av->leb_count != leb_count) { |
801c135c AB |
1599 | ubi_err("bad leb_count, %d objects in the tree", |
1600 | leb_count); | |
517af48c | 1601 | goto bad_av; |
801c135c AB |
1602 | } |
1603 | ||
2c5ec5ce | 1604 | if (!last_aeb) |
801c135c AB |
1605 | continue; |
1606 | ||
2c5ec5ce | 1607 | aeb = last_aeb; |
801c135c | 1608 | |
517af48c | 1609 | if (aeb->lnum != av->highest_lnum) { |
801c135c | 1610 | ubi_err("bad highest_lnum"); |
2c5ec5ce | 1611 | goto bad_aeb; |
801c135c AB |
1612 | } |
1613 | } | |
1614 | ||
a4e6042f AB |
1615 | if (vols_found != ai->vols_found) { |
1616 | ubi_err("bad ai->vols_found %d, should be %d", | |
1617 | ai->vols_found, vols_found); | |
801c135c AB |
1618 | goto out; |
1619 | } | |
1620 | ||
a4e6042f | 1621 | /* Check that attaching information is correct */ |
517af48c | 1622 | ubi_rb_for_each_entry(rb1, av, &ai->volumes, rb) { |
2c5ec5ce | 1623 | last_aeb = NULL; |
517af48c | 1624 | ubi_rb_for_each_entry(rb2, aeb, &av->root, u.rb) { |
801c135c AB |
1625 | int vol_type; |
1626 | ||
1627 | cond_resched(); | |
1628 | ||
2c5ec5ce | 1629 | last_aeb = aeb; |
801c135c | 1630 | |
2c5ec5ce | 1631 | err = ubi_io_read_vid_hdr(ubi, aeb->pnum, vidh, 1); |
801c135c AB |
1632 | if (err && err != UBI_IO_BITFLIPS) { |
1633 | ubi_err("VID header is not OK (%d)", err); | |
1634 | if (err > 0) | |
1635 | err = -EIO; | |
1636 | return err; | |
1637 | } | |
1638 | ||
1639 | vol_type = vidh->vol_type == UBI_VID_DYNAMIC ? | |
1640 | UBI_DYNAMIC_VOLUME : UBI_STATIC_VOLUME; | |
517af48c | 1641 | if (av->vol_type != vol_type) { |
801c135c AB |
1642 | ubi_err("bad vol_type"); |
1643 | goto bad_vid_hdr; | |
1644 | } | |
1645 | ||
2c5ec5ce AB |
1646 | if (aeb->sqnum != be64_to_cpu(vidh->sqnum)) { |
1647 | ubi_err("bad sqnum %llu", aeb->sqnum); | |
801c135c AB |
1648 | goto bad_vid_hdr; |
1649 | } | |
1650 | ||
517af48c AB |
1651 | if (av->vol_id != be32_to_cpu(vidh->vol_id)) { |
1652 | ubi_err("bad vol_id %d", av->vol_id); | |
801c135c AB |
1653 | goto bad_vid_hdr; |
1654 | } | |
1655 | ||
517af48c | 1656 | if (av->compat != vidh->compat) { |
801c135c AB |
1657 | ubi_err("bad compat %d", vidh->compat); |
1658 | goto bad_vid_hdr; | |
1659 | } | |
1660 | ||
2c5ec5ce AB |
1661 | if (aeb->lnum != be32_to_cpu(vidh->lnum)) { |
1662 | ubi_err("bad lnum %d", aeb->lnum); | |
801c135c AB |
1663 | goto bad_vid_hdr; |
1664 | } | |
1665 | ||
517af48c AB |
1666 | if (av->used_ebs != be32_to_cpu(vidh->used_ebs)) { |
1667 | ubi_err("bad used_ebs %d", av->used_ebs); | |
801c135c AB |
1668 | goto bad_vid_hdr; |
1669 | } | |
1670 | ||
517af48c AB |
1671 | if (av->data_pad != be32_to_cpu(vidh->data_pad)) { |
1672 | ubi_err("bad data_pad %d", av->data_pad); | |
801c135c AB |
1673 | goto bad_vid_hdr; |
1674 | } | |
801c135c AB |
1675 | } |
1676 | ||
2c5ec5ce | 1677 | if (!last_aeb) |
801c135c AB |
1678 | continue; |
1679 | ||
517af48c AB |
1680 | if (av->highest_lnum != be32_to_cpu(vidh->lnum)) { |
1681 | ubi_err("bad highest_lnum %d", av->highest_lnum); | |
801c135c AB |
1682 | goto bad_vid_hdr; |
1683 | } | |
1684 | ||
517af48c AB |
1685 | if (av->last_data_size != be32_to_cpu(vidh->data_size)) { |
1686 | ubi_err("bad last_data_size %d", av->last_data_size); | |
801c135c AB |
1687 | goto bad_vid_hdr; |
1688 | } | |
1689 | } | |
1690 | ||
1691 | /* | |
1692 | * Make sure that all the physical eraseblocks are in one of the lists | |
1693 | * or trees. | |
1694 | */ | |
d9b0744d | 1695 | buf = kzalloc(ubi->peb_count, GFP_KERNEL); |
801c135c AB |
1696 | if (!buf) |
1697 | return -ENOMEM; | |
1698 | ||
801c135c AB |
1699 | for (pnum = 0; pnum < ubi->peb_count; pnum++) { |
1700 | err = ubi_io_is_bad(ubi, pnum); | |
341e1a0c AB |
1701 | if (err < 0) { |
1702 | kfree(buf); | |
801c135c | 1703 | return err; |
9c9ec147 | 1704 | } else if (err) |
d9b0744d | 1705 | buf[pnum] = 1; |
801c135c AB |
1706 | } |
1707 | ||
517af48c AB |
1708 | ubi_rb_for_each_entry(rb1, av, &ai->volumes, rb) |
1709 | ubi_rb_for_each_entry(rb2, aeb, &av->root, u.rb) | |
2c5ec5ce | 1710 | buf[aeb->pnum] = 1; |
801c135c | 1711 | |
a4e6042f | 1712 | list_for_each_entry(aeb, &ai->free, u.list) |
2c5ec5ce | 1713 | buf[aeb->pnum] = 1; |
801c135c | 1714 | |
a4e6042f | 1715 | list_for_each_entry(aeb, &ai->corr, u.list) |
2c5ec5ce | 1716 | buf[aeb->pnum] = 1; |
801c135c | 1717 | |
a4e6042f | 1718 | list_for_each_entry(aeb, &ai->erase, u.list) |
2c5ec5ce | 1719 | buf[aeb->pnum] = 1; |
801c135c | 1720 | |
a4e6042f | 1721 | list_for_each_entry(aeb, &ai->alien, u.list) |
2c5ec5ce | 1722 | buf[aeb->pnum] = 1; |
801c135c AB |
1723 | |
1724 | err = 0; | |
1725 | for (pnum = 0; pnum < ubi->peb_count; pnum++) | |
d9b0744d | 1726 | if (!buf[pnum]) { |
801c135c AB |
1727 | ubi_err("PEB %d is not referred", pnum); |
1728 | err = 1; | |
1729 | } | |
1730 | ||
1731 | kfree(buf); | |
1732 | if (err) | |
1733 | goto out; | |
1734 | return 0; | |
1735 | ||
2c5ec5ce | 1736 | bad_aeb: |
a4e6042f | 1737 | ubi_err("bad attaching information about LEB %d", aeb->lnum); |
2c5ec5ce | 1738 | ubi_dump_aeb(aeb, 0); |
517af48c | 1739 | ubi_dump_av(av); |
801c135c AB |
1740 | goto out; |
1741 | ||
517af48c AB |
1742 | bad_av: |
1743 | ubi_err("bad attaching information about volume %d", av->vol_id); | |
1744 | ubi_dump_av(av); | |
801c135c AB |
1745 | goto out; |
1746 | ||
1747 | bad_vid_hdr: | |
517af48c AB |
1748 | ubi_err("bad attaching information about volume %d", av->vol_id); |
1749 | ubi_dump_av(av); | |
a904e3f1 | 1750 | ubi_dump_vid_hdr(vidh); |
801c135c AB |
1751 | |
1752 | out: | |
25886a36 | 1753 | dump_stack(); |
adbf05e3 | 1754 | return -EINVAL; |
801c135c | 1755 | } |