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dbb7d2a8 RW |
1 | /* |
2 | * Copyright (c) 2012 Linutronix GmbH | |
daef3dd1 | 3 | * Copyright (c) 2014 sigma star gmbh |
dbb7d2a8 RW |
4 | * Author: Richard Weinberger <richard@nod.at> |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; version 2. | |
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 | */ | |
16 | ||
17 | #include <linux/crc32.h> | |
5d71afb0 | 18 | #include <linux/bitmap.h> |
dbb7d2a8 RW |
19 | #include "ubi.h" |
20 | ||
daef3dd1 RW |
21 | /** |
22 | * init_seen - allocate memory for used for debugging. | |
23 | * @ubi: UBI device description object | |
24 | */ | |
5d71afb0 | 25 | static inline unsigned long *init_seen(struct ubi_device *ubi) |
daef3dd1 | 26 | { |
5d71afb0 | 27 | unsigned long *ret; |
daef3dd1 RW |
28 | |
29 | if (!ubi_dbg_chk_fastmap(ubi)) | |
30 | return NULL; | |
31 | ||
5d71afb0 RW |
32 | ret = kcalloc(BITS_TO_LONGS(ubi->peb_count), sizeof(unsigned long), |
33 | GFP_KERNEL); | |
daef3dd1 RW |
34 | if (!ret) |
35 | return ERR_PTR(-ENOMEM); | |
36 | ||
37 | return ret; | |
38 | } | |
39 | ||
40 | /** | |
41 | * free_seen - free the seen logic integer array. | |
42 | * @seen: integer array of @ubi->peb_count size | |
43 | */ | |
5d71afb0 | 44 | static inline void free_seen(unsigned long *seen) |
daef3dd1 RW |
45 | { |
46 | kfree(seen); | |
47 | } | |
48 | ||
49 | /** | |
50 | * set_seen - mark a PEB as seen. | |
51 | * @ubi: UBI device description object | |
52 | * @pnum: The PEB to be makred as seen | |
53 | * @seen: integer array of @ubi->peb_count size | |
54 | */ | |
5d71afb0 | 55 | static inline void set_seen(struct ubi_device *ubi, int pnum, unsigned long *seen) |
daef3dd1 RW |
56 | { |
57 | if (!ubi_dbg_chk_fastmap(ubi) || !seen) | |
58 | return; | |
59 | ||
5d71afb0 | 60 | set_bit(pnum, seen); |
daef3dd1 RW |
61 | } |
62 | ||
63 | /** | |
64 | * self_check_seen - check whether all PEB have been seen by fastmap. | |
65 | * @ubi: UBI device description object | |
66 | * @seen: integer array of @ubi->peb_count size | |
67 | */ | |
5d71afb0 | 68 | static int self_check_seen(struct ubi_device *ubi, unsigned long *seen) |
daef3dd1 RW |
69 | { |
70 | int pnum, ret = 0; | |
71 | ||
72 | if (!ubi_dbg_chk_fastmap(ubi) || !seen) | |
73 | return 0; | |
74 | ||
75 | for (pnum = 0; pnum < ubi->peb_count; pnum++) { | |
5d71afb0 | 76 | if (test_bit(pnum, seen) && ubi->lookuptbl[pnum]) { |
daef3dd1 RW |
77 | ubi_err(ubi, "self-check failed for PEB %d, fastmap didn't see it", pnum); |
78 | ret = -EINVAL; | |
79 | } | |
80 | } | |
81 | ||
82 | return ret; | |
83 | } | |
84 | ||
dbb7d2a8 RW |
85 | /** |
86 | * ubi_calc_fm_size - calculates the fastmap size in bytes for an UBI device. | |
87 | * @ubi: UBI device description object | |
88 | */ | |
89 | size_t ubi_calc_fm_size(struct ubi_device *ubi) | |
90 | { | |
91 | size_t size; | |
92 | ||
a18fd672 | 93 | size = sizeof(struct ubi_fm_sb) + |
94 | sizeof(struct ubi_fm_hdr) + | |
95 | sizeof(struct ubi_fm_scan_pool) + | |
96 | sizeof(struct ubi_fm_scan_pool) + | |
97 | (ubi->peb_count * sizeof(struct ubi_fm_ec)) + | |
98 | (sizeof(struct ubi_fm_eba) + | |
99 | (ubi->peb_count * sizeof(__be32))) + | |
dbb7d2a8 RW |
100 | sizeof(struct ubi_fm_volhdr) * UBI_MAX_VOLUMES; |
101 | return roundup(size, ubi->leb_size); | |
102 | } | |
103 | ||
104 | ||
105 | /** | |
106 | * new_fm_vhdr - allocate a new volume header for fastmap usage. | |
107 | * @ubi: UBI device description object | |
108 | * @vol_id: the VID of the new header | |
109 | * | |
110 | * Returns a new struct ubi_vid_hdr on success. | |
111 | * NULL indicates out of memory. | |
112 | */ | |
113 | static struct ubi_vid_hdr *new_fm_vhdr(struct ubi_device *ubi, int vol_id) | |
114 | { | |
115 | struct ubi_vid_hdr *new; | |
116 | ||
117 | new = ubi_zalloc_vid_hdr(ubi, GFP_KERNEL); | |
118 | if (!new) | |
119 | goto out; | |
120 | ||
121 | new->vol_type = UBI_VID_DYNAMIC; | |
122 | new->vol_id = cpu_to_be32(vol_id); | |
123 | ||
124 | /* UBI implementations without fastmap support have to delete the | |
125 | * fastmap. | |
126 | */ | |
127 | new->compat = UBI_COMPAT_DELETE; | |
128 | ||
129 | out: | |
130 | return new; | |
131 | } | |
132 | ||
133 | /** | |
134 | * add_aeb - create and add a attach erase block to a given list. | |
135 | * @ai: UBI attach info object | |
136 | * @list: the target list | |
137 | * @pnum: PEB number of the new attach erase block | |
138 | * @ec: erease counter of the new LEB | |
139 | * @scrub: scrub this PEB after attaching | |
140 | * | |
141 | * Returns 0 on success, < 0 indicates an internal error. | |
142 | */ | |
143 | static int add_aeb(struct ubi_attach_info *ai, struct list_head *list, | |
144 | int pnum, int ec, int scrub) | |
145 | { | |
146 | struct ubi_ainf_peb *aeb; | |
147 | ||
148 | aeb = kmem_cache_alloc(ai->aeb_slab_cache, GFP_KERNEL); | |
149 | if (!aeb) | |
150 | return -ENOMEM; | |
151 | ||
152 | aeb->pnum = pnum; | |
153 | aeb->ec = ec; | |
154 | aeb->lnum = -1; | |
155 | aeb->scrub = scrub; | |
156 | aeb->copy_flag = aeb->sqnum = 0; | |
157 | ||
158 | ai->ec_sum += aeb->ec; | |
159 | ai->ec_count++; | |
160 | ||
161 | if (ai->max_ec < aeb->ec) | |
162 | ai->max_ec = aeb->ec; | |
163 | ||
164 | if (ai->min_ec > aeb->ec) | |
165 | ai->min_ec = aeb->ec; | |
166 | ||
167 | list_add_tail(&aeb->u.list, list); | |
168 | ||
169 | return 0; | |
170 | } | |
171 | ||
172 | /** | |
173 | * add_vol - create and add a new volume to ubi_attach_info. | |
174 | * @ai: ubi_attach_info object | |
175 | * @vol_id: VID of the new volume | |
176 | * @used_ebs: number of used EBS | |
177 | * @data_pad: data padding value of the new volume | |
178 | * @vol_type: volume type | |
179 | * @last_eb_bytes: number of bytes in the last LEB | |
180 | * | |
181 | * Returns the new struct ubi_ainf_volume on success. | |
182 | * NULL indicates an error. | |
183 | */ | |
184 | static struct ubi_ainf_volume *add_vol(struct ubi_attach_info *ai, int vol_id, | |
185 | int used_ebs, int data_pad, u8 vol_type, | |
186 | int last_eb_bytes) | |
187 | { | |
188 | struct ubi_ainf_volume *av; | |
189 | struct rb_node **p = &ai->volumes.rb_node, *parent = NULL; | |
190 | ||
191 | while (*p) { | |
192 | parent = *p; | |
193 | av = rb_entry(parent, struct ubi_ainf_volume, rb); | |
194 | ||
e9110361 | 195 | if (vol_id > av->vol_id) |
dbb7d2a8 | 196 | p = &(*p)->rb_left; |
e96a8a3b | 197 | else if (vol_id < av->vol_id) |
dbb7d2a8 | 198 | p = &(*p)->rb_right; |
e96a8a3b | 199 | else |
200 | return ERR_PTR(-EINVAL); | |
dbb7d2a8 RW |
201 | } |
202 | ||
203 | av = kmalloc(sizeof(struct ubi_ainf_volume), GFP_KERNEL); | |
204 | if (!av) | |
205 | goto out; | |
206 | ||
42dd3cdc | 207 | av->highest_lnum = av->leb_count = av->used_ebs = 0; |
dbb7d2a8 | 208 | av->vol_id = vol_id; |
dbb7d2a8 RW |
209 | av->data_pad = data_pad; |
210 | av->last_data_size = last_eb_bytes; | |
211 | av->compat = 0; | |
212 | av->vol_type = vol_type; | |
213 | av->root = RB_ROOT; | |
42dd3cdc RW |
214 | if (av->vol_type == UBI_STATIC_VOLUME) |
215 | av->used_ebs = used_ebs; | |
dbb7d2a8 RW |
216 | |
217 | dbg_bld("found volume (ID %i)", vol_id); | |
218 | ||
219 | rb_link_node(&av->rb, parent, p); | |
220 | rb_insert_color(&av->rb, &ai->volumes); | |
221 | ||
222 | out: | |
223 | return av; | |
224 | } | |
225 | ||
226 | /** | |
227 | * assign_aeb_to_av - assigns a SEB to a given ainf_volume and removes it | |
228 | * from it's original list. | |
229 | * @ai: ubi_attach_info object | |
230 | * @aeb: the to be assigned SEB | |
231 | * @av: target scan volume | |
232 | */ | |
233 | static void assign_aeb_to_av(struct ubi_attach_info *ai, | |
234 | struct ubi_ainf_peb *aeb, | |
235 | struct ubi_ainf_volume *av) | |
236 | { | |
237 | struct ubi_ainf_peb *tmp_aeb; | |
238 | struct rb_node **p = &ai->volumes.rb_node, *parent = NULL; | |
239 | ||
240 | p = &av->root.rb_node; | |
241 | while (*p) { | |
242 | parent = *p; | |
243 | ||
244 | tmp_aeb = rb_entry(parent, struct ubi_ainf_peb, u.rb); | |
245 | if (aeb->lnum != tmp_aeb->lnum) { | |
246 | if (aeb->lnum < tmp_aeb->lnum) | |
247 | p = &(*p)->rb_left; | |
248 | else | |
249 | p = &(*p)->rb_right; | |
250 | ||
251 | continue; | |
252 | } else | |
253 | break; | |
254 | } | |
255 | ||
256 | list_del(&aeb->u.list); | |
257 | av->leb_count++; | |
258 | ||
259 | rb_link_node(&aeb->u.rb, parent, p); | |
260 | rb_insert_color(&aeb->u.rb, &av->root); | |
261 | } | |
262 | ||
263 | /** | |
264 | * update_vol - inserts or updates a LEB which was found a pool. | |
265 | * @ubi: the UBI device object | |
266 | * @ai: attach info object | |
267 | * @av: the volume this LEB belongs to | |
268 | * @new_vh: the volume header derived from new_aeb | |
269 | * @new_aeb: the AEB to be examined | |
270 | * | |
271 | * Returns 0 on success, < 0 indicates an internal error. | |
272 | */ | |
273 | static int update_vol(struct ubi_device *ubi, struct ubi_attach_info *ai, | |
274 | struct ubi_ainf_volume *av, struct ubi_vid_hdr *new_vh, | |
275 | struct ubi_ainf_peb *new_aeb) | |
276 | { | |
277 | struct rb_node **p = &av->root.rb_node, *parent = NULL; | |
278 | struct ubi_ainf_peb *aeb, *victim; | |
279 | int cmp_res; | |
280 | ||
281 | while (*p) { | |
282 | parent = *p; | |
283 | aeb = rb_entry(parent, struct ubi_ainf_peb, u.rb); | |
284 | ||
285 | if (be32_to_cpu(new_vh->lnum) != aeb->lnum) { | |
286 | if (be32_to_cpu(new_vh->lnum) < aeb->lnum) | |
287 | p = &(*p)->rb_left; | |
288 | else | |
289 | p = &(*p)->rb_right; | |
290 | ||
291 | continue; | |
292 | } | |
293 | ||
294 | /* This case can happen if the fastmap gets written | |
295 | * because of a volume change (creation, deletion, ..). | |
296 | * Then a PEB can be within the persistent EBA and the pool. | |
297 | */ | |
298 | if (aeb->pnum == new_aeb->pnum) { | |
299 | ubi_assert(aeb->lnum == new_aeb->lnum); | |
300 | kmem_cache_free(ai->aeb_slab_cache, new_aeb); | |
301 | ||
302 | return 0; | |
303 | } | |
304 | ||
305 | cmp_res = ubi_compare_lebs(ubi, aeb, new_aeb->pnum, new_vh); | |
306 | if (cmp_res < 0) | |
307 | return cmp_res; | |
308 | ||
309 | /* new_aeb is newer */ | |
310 | if (cmp_res & 1) { | |
311 | victim = kmem_cache_alloc(ai->aeb_slab_cache, | |
312 | GFP_KERNEL); | |
313 | if (!victim) | |
314 | return -ENOMEM; | |
315 | ||
316 | victim->ec = aeb->ec; | |
317 | victim->pnum = aeb->pnum; | |
318 | list_add_tail(&victim->u.list, &ai->erase); | |
319 | ||
320 | if (av->highest_lnum == be32_to_cpu(new_vh->lnum)) | |
669d3d12 | 321 | av->last_data_size = |
dbb7d2a8 RW |
322 | be32_to_cpu(new_vh->data_size); |
323 | ||
324 | dbg_bld("vol %i: AEB %i's PEB %i is the newer", | |
325 | av->vol_id, aeb->lnum, new_aeb->pnum); | |
326 | ||
327 | aeb->ec = new_aeb->ec; | |
328 | aeb->pnum = new_aeb->pnum; | |
329 | aeb->copy_flag = new_vh->copy_flag; | |
330 | aeb->scrub = new_aeb->scrub; | |
331 | kmem_cache_free(ai->aeb_slab_cache, new_aeb); | |
332 | ||
333 | /* new_aeb is older */ | |
334 | } else { | |
335 | dbg_bld("vol %i: AEB %i's PEB %i is old, dropping it", | |
336 | av->vol_id, aeb->lnum, new_aeb->pnum); | |
337 | list_add_tail(&new_aeb->u.list, &ai->erase); | |
338 | } | |
339 | ||
340 | return 0; | |
341 | } | |
342 | /* This LEB is new, let's add it to the volume */ | |
343 | ||
344 | if (av->highest_lnum <= be32_to_cpu(new_vh->lnum)) { | |
345 | av->highest_lnum = be32_to_cpu(new_vh->lnum); | |
346 | av->last_data_size = be32_to_cpu(new_vh->data_size); | |
347 | } | |
348 | ||
349 | if (av->vol_type == UBI_STATIC_VOLUME) | |
350 | av->used_ebs = be32_to_cpu(new_vh->used_ebs); | |
351 | ||
352 | av->leb_count++; | |
353 | ||
354 | rb_link_node(&new_aeb->u.rb, parent, p); | |
355 | rb_insert_color(&new_aeb->u.rb, &av->root); | |
356 | ||
357 | return 0; | |
358 | } | |
359 | ||
360 | /** | |
361 | * process_pool_aeb - we found a non-empty PEB in a pool. | |
362 | * @ubi: UBI device object | |
363 | * @ai: attach info object | |
364 | * @new_vh: the volume header derived from new_aeb | |
365 | * @new_aeb: the AEB to be examined | |
366 | * | |
367 | * Returns 0 on success, < 0 indicates an internal error. | |
368 | */ | |
369 | static int process_pool_aeb(struct ubi_device *ubi, struct ubi_attach_info *ai, | |
370 | struct ubi_vid_hdr *new_vh, | |
371 | struct ubi_ainf_peb *new_aeb) | |
372 | { | |
373 | struct ubi_ainf_volume *av, *tmp_av = NULL; | |
374 | struct rb_node **p = &ai->volumes.rb_node, *parent = NULL; | |
375 | int found = 0; | |
376 | ||
377 | if (be32_to_cpu(new_vh->vol_id) == UBI_FM_SB_VOLUME_ID || | |
378 | be32_to_cpu(new_vh->vol_id) == UBI_FM_DATA_VOLUME_ID) { | |
379 | kmem_cache_free(ai->aeb_slab_cache, new_aeb); | |
380 | ||
381 | return 0; | |
382 | } | |
383 | ||
384 | /* Find the volume this SEB belongs to */ | |
385 | while (*p) { | |
386 | parent = *p; | |
387 | tmp_av = rb_entry(parent, struct ubi_ainf_volume, rb); | |
388 | ||
389 | if (be32_to_cpu(new_vh->vol_id) > tmp_av->vol_id) | |
390 | p = &(*p)->rb_left; | |
391 | else if (be32_to_cpu(new_vh->vol_id) < tmp_av->vol_id) | |
392 | p = &(*p)->rb_right; | |
393 | else { | |
394 | found = 1; | |
395 | break; | |
396 | } | |
397 | } | |
398 | ||
399 | if (found) | |
400 | av = tmp_av; | |
401 | else { | |
32608703 | 402 | ubi_err(ubi, "orphaned volume in fastmap pool!"); |
1bf1890e | 403 | kmem_cache_free(ai->aeb_slab_cache, new_aeb); |
dbb7d2a8 RW |
404 | return UBI_BAD_FASTMAP; |
405 | } | |
406 | ||
407 | ubi_assert(be32_to_cpu(new_vh->vol_id) == av->vol_id); | |
408 | ||
409 | return update_vol(ubi, ai, av, new_vh, new_aeb); | |
410 | } | |
411 | ||
412 | /** | |
413 | * unmap_peb - unmap a PEB. | |
414 | * If fastmap detects a free PEB in the pool it has to check whether | |
415 | * this PEB has been unmapped after writing the fastmap. | |
416 | * | |
417 | * @ai: UBI attach info object | |
418 | * @pnum: The PEB to be unmapped | |
419 | */ | |
420 | static void unmap_peb(struct ubi_attach_info *ai, int pnum) | |
421 | { | |
422 | struct ubi_ainf_volume *av; | |
423 | struct rb_node *node, *node2; | |
424 | struct ubi_ainf_peb *aeb; | |
425 | ||
426 | for (node = rb_first(&ai->volumes); node; node = rb_next(node)) { | |
427 | av = rb_entry(node, struct ubi_ainf_volume, rb); | |
428 | ||
429 | for (node2 = rb_first(&av->root); node2; | |
430 | node2 = rb_next(node2)) { | |
431 | aeb = rb_entry(node2, struct ubi_ainf_peb, u.rb); | |
432 | if (aeb->pnum == pnum) { | |
433 | rb_erase(&aeb->u.rb, &av->root); | |
ad3d6a05 | 434 | av->leb_count--; |
dbb7d2a8 RW |
435 | kmem_cache_free(ai->aeb_slab_cache, aeb); |
436 | return; | |
437 | } | |
438 | } | |
439 | } | |
440 | } | |
441 | ||
442 | /** | |
443 | * scan_pool - scans a pool for changed (no longer empty PEBs). | |
444 | * @ubi: UBI device object | |
445 | * @ai: attach info object | |
446 | * @pebs: an array of all PEB numbers in the to be scanned pool | |
447 | * @pool_size: size of the pool (number of entries in @pebs) | |
448 | * @max_sqnum: pointer to the maximal sequence number | |
dbb7d2a8 RW |
449 | * @free: list of PEBs which are most likely free (and go into @ai->free) |
450 | * | |
451 | * Returns 0 on success, if the pool is unusable UBI_BAD_FASTMAP is returned. | |
452 | * < 0 indicates an internal error. | |
453 | */ | |
454 | static int scan_pool(struct ubi_device *ubi, struct ubi_attach_info *ai, | |
2a130f1a | 455 | __be32 *pebs, int pool_size, unsigned long long *max_sqnum, |
d141a8ef | 456 | struct list_head *free) |
dbb7d2a8 RW |
457 | { |
458 | struct ubi_vid_hdr *vh; | |
459 | struct ubi_ec_hdr *ech; | |
d141a8ef RW |
460 | struct ubi_ainf_peb *new_aeb; |
461 | int i, pnum, err, ret = 0; | |
dbb7d2a8 RW |
462 | |
463 | ech = kzalloc(ubi->ec_hdr_alsize, GFP_KERNEL); | |
464 | if (!ech) | |
465 | return -ENOMEM; | |
466 | ||
467 | vh = ubi_zalloc_vid_hdr(ubi, GFP_KERNEL); | |
468 | if (!vh) { | |
469 | kfree(ech); | |
470 | return -ENOMEM; | |
471 | } | |
472 | ||
473 | dbg_bld("scanning fastmap pool: size = %i", pool_size); | |
474 | ||
475 | /* | |
476 | * Now scan all PEBs in the pool to find changes which have been made | |
477 | * after the creation of the fastmap | |
478 | */ | |
479 | for (i = 0; i < pool_size; i++) { | |
480 | int scrub = 0; | |
c22301ad | 481 | int image_seq; |
dbb7d2a8 RW |
482 | |
483 | pnum = be32_to_cpu(pebs[i]); | |
484 | ||
485 | if (ubi_io_is_bad(ubi, pnum)) { | |
32608703 | 486 | ubi_err(ubi, "bad PEB in fastmap pool!"); |
dbb7d2a8 RW |
487 | ret = UBI_BAD_FASTMAP; |
488 | goto out; | |
489 | } | |
490 | ||
491 | err = ubi_io_read_ec_hdr(ubi, pnum, ech, 0); | |
492 | if (err && err != UBI_IO_BITFLIPS) { | |
32608703 | 493 | ubi_err(ubi, "unable to read EC header! PEB:%i err:%i", |
dbb7d2a8 RW |
494 | pnum, err); |
495 | ret = err > 0 ? UBI_BAD_FASTMAP : err; | |
496 | goto out; | |
44305ebd | 497 | } else if (err == UBI_IO_BITFLIPS) |
dbb7d2a8 RW |
498 | scrub = 1; |
499 | ||
c22301ad RG |
500 | /* |
501 | * Older UBI implementations have image_seq set to zero, so | |
502 | * we shouldn't fail if image_seq == 0. | |
503 | */ | |
504 | image_seq = be32_to_cpu(ech->image_seq); | |
505 | ||
506 | if (image_seq && (image_seq != ubi->image_seq)) { | |
32608703 | 507 | ubi_err(ubi, "bad image seq: 0x%x, expected: 0x%x", |
dbb7d2a8 | 508 | be32_to_cpu(ech->image_seq), ubi->image_seq); |
f240dca8 | 509 | ret = UBI_BAD_FASTMAP; |
dbb7d2a8 RW |
510 | goto out; |
511 | } | |
512 | ||
513 | err = ubi_io_read_vid_hdr(ubi, pnum, vh, 0); | |
514 | if (err == UBI_IO_FF || err == UBI_IO_FF_BITFLIPS) { | |
515 | unsigned long long ec = be64_to_cpu(ech->ec); | |
516 | unmap_peb(ai, pnum); | |
517 | dbg_bld("Adding PEB to free: %i", pnum); | |
518 | if (err == UBI_IO_FF_BITFLIPS) | |
519 | add_aeb(ai, free, pnum, ec, 1); | |
520 | else | |
521 | add_aeb(ai, free, pnum, ec, 0); | |
522 | continue; | |
523 | } else if (err == 0 || err == UBI_IO_BITFLIPS) { | |
524 | dbg_bld("Found non empty PEB:%i in pool", pnum); | |
525 | ||
526 | if (err == UBI_IO_BITFLIPS) | |
527 | scrub = 1; | |
528 | ||
dbb7d2a8 RW |
529 | new_aeb = kmem_cache_alloc(ai->aeb_slab_cache, |
530 | GFP_KERNEL); | |
531 | if (!new_aeb) { | |
532 | ret = -ENOMEM; | |
533 | goto out; | |
534 | } | |
535 | ||
536 | new_aeb->ec = be64_to_cpu(ech->ec); | |
537 | new_aeb->pnum = pnum; | |
538 | new_aeb->lnum = be32_to_cpu(vh->lnum); | |
539 | new_aeb->sqnum = be64_to_cpu(vh->sqnum); | |
540 | new_aeb->copy_flag = vh->copy_flag; | |
541 | new_aeb->scrub = scrub; | |
542 | ||
543 | if (*max_sqnum < new_aeb->sqnum) | |
544 | *max_sqnum = new_aeb->sqnum; | |
545 | ||
546 | err = process_pool_aeb(ubi, ai, vh, new_aeb); | |
547 | if (err) { | |
548 | ret = err > 0 ? UBI_BAD_FASTMAP : err; | |
549 | goto out; | |
550 | } | |
551 | } else { | |
552 | /* We are paranoid and fall back to scanning mode */ | |
32608703 | 553 | ubi_err(ubi, "fastmap pool PEBs contains damaged PEBs!"); |
dbb7d2a8 RW |
554 | ret = err > 0 ? UBI_BAD_FASTMAP : err; |
555 | goto out; | |
556 | } | |
557 | ||
558 | } | |
559 | ||
560 | out: | |
561 | ubi_free_vid_hdr(ubi, vh); | |
562 | kfree(ech); | |
563 | return ret; | |
564 | } | |
565 | ||
566 | /** | |
567 | * count_fastmap_pebs - Counts the PEBs found by fastmap. | |
568 | * @ai: The UBI attach info object | |
569 | */ | |
570 | static int count_fastmap_pebs(struct ubi_attach_info *ai) | |
571 | { | |
572 | struct ubi_ainf_peb *aeb; | |
573 | struct ubi_ainf_volume *av; | |
574 | struct rb_node *rb1, *rb2; | |
575 | int n = 0; | |
576 | ||
577 | list_for_each_entry(aeb, &ai->erase, u.list) | |
578 | n++; | |
579 | ||
580 | list_for_each_entry(aeb, &ai->free, u.list) | |
581 | n++; | |
582 | ||
be801105 | 583 | ubi_rb_for_each_entry(rb1, av, &ai->volumes, rb) |
dbb7d2a8 RW |
584 | ubi_rb_for_each_entry(rb2, aeb, &av->root, u.rb) |
585 | n++; | |
586 | ||
587 | return n; | |
588 | } | |
589 | ||
590 | /** | |
591 | * ubi_attach_fastmap - creates ubi_attach_info from a fastmap. | |
592 | * @ubi: UBI device object | |
593 | * @ai: UBI attach info object | |
594 | * @fm: the fastmap to be attached | |
595 | * | |
596 | * Returns 0 on success, UBI_BAD_FASTMAP if the found fastmap was unusable. | |
597 | * < 0 indicates an internal error. | |
598 | */ | |
599 | static int ubi_attach_fastmap(struct ubi_device *ubi, | |
600 | struct ubi_attach_info *ai, | |
601 | struct ubi_fastmap_layout *fm) | |
602 | { | |
d141a8ef | 603 | struct list_head used, free; |
dbb7d2a8 RW |
604 | struct ubi_ainf_volume *av; |
605 | struct ubi_ainf_peb *aeb, *tmp_aeb, *_tmp_aeb; | |
dbb7d2a8 RW |
606 | struct ubi_fm_sb *fmsb; |
607 | struct ubi_fm_hdr *fmhdr; | |
f6e951af | 608 | struct ubi_fm_scan_pool *fmpl, *fmpl_wl; |
dbb7d2a8 RW |
609 | struct ubi_fm_ec *fmec; |
610 | struct ubi_fm_volhdr *fmvhdr; | |
611 | struct ubi_fm_eba *fm_eba; | |
612 | int ret, i, j, pool_size, wl_pool_size; | |
613 | size_t fm_pos = 0, fm_size = ubi->fm_size; | |
614 | unsigned long long max_sqnum = 0; | |
615 | void *fm_raw = ubi->fm_buf; | |
616 | ||
617 | INIT_LIST_HEAD(&used); | |
618 | INIT_LIST_HEAD(&free); | |
dbb7d2a8 RW |
619 | ai->min_ec = UBI_MAX_ERASECOUNTER; |
620 | ||
dbb7d2a8 RW |
621 | fmsb = (struct ubi_fm_sb *)(fm_raw); |
622 | ai->max_sqnum = fmsb->sqnum; | |
623 | fm_pos += sizeof(struct ubi_fm_sb); | |
624 | if (fm_pos >= fm_size) | |
625 | goto fail_bad; | |
626 | ||
627 | fmhdr = (struct ubi_fm_hdr *)(fm_raw + fm_pos); | |
628 | fm_pos += sizeof(*fmhdr); | |
629 | if (fm_pos >= fm_size) | |
630 | goto fail_bad; | |
631 | ||
632 | if (be32_to_cpu(fmhdr->magic) != UBI_FM_HDR_MAGIC) { | |
32608703 | 633 | ubi_err(ubi, "bad fastmap header magic: 0x%x, expected: 0x%x", |
dbb7d2a8 RW |
634 | be32_to_cpu(fmhdr->magic), UBI_FM_HDR_MAGIC); |
635 | goto fail_bad; | |
636 | } | |
637 | ||
f6e951af | 638 | fmpl = (struct ubi_fm_scan_pool *)(fm_raw + fm_pos); |
639 | fm_pos += sizeof(*fmpl); | |
dbb7d2a8 RW |
640 | if (fm_pos >= fm_size) |
641 | goto fail_bad; | |
f6e951af | 642 | if (be32_to_cpu(fmpl->magic) != UBI_FM_POOL_MAGIC) { |
32608703 | 643 | ubi_err(ubi, "bad fastmap pool magic: 0x%x, expected: 0x%x", |
f6e951af | 644 | be32_to_cpu(fmpl->magic), UBI_FM_POOL_MAGIC); |
dbb7d2a8 RW |
645 | goto fail_bad; |
646 | } | |
647 | ||
f6e951af | 648 | fmpl_wl = (struct ubi_fm_scan_pool *)(fm_raw + fm_pos); |
649 | fm_pos += sizeof(*fmpl_wl); | |
dbb7d2a8 RW |
650 | if (fm_pos >= fm_size) |
651 | goto fail_bad; | |
f6e951af | 652 | if (be32_to_cpu(fmpl_wl->magic) != UBI_FM_POOL_MAGIC) { |
653 | ubi_err(ubi, "bad fastmap WL pool magic: 0x%x, expected: 0x%x", | |
654 | be32_to_cpu(fmpl_wl->magic), UBI_FM_POOL_MAGIC); | |
dbb7d2a8 RW |
655 | goto fail_bad; |
656 | } | |
657 | ||
f6e951af | 658 | pool_size = be16_to_cpu(fmpl->size); |
659 | wl_pool_size = be16_to_cpu(fmpl_wl->size); | |
660 | fm->max_pool_size = be16_to_cpu(fmpl->max_size); | |
661 | fm->max_wl_pool_size = be16_to_cpu(fmpl_wl->max_size); | |
dbb7d2a8 RW |
662 | |
663 | if (pool_size > UBI_FM_MAX_POOL_SIZE || pool_size < 0) { | |
32608703 | 664 | ubi_err(ubi, "bad pool size: %i", pool_size); |
dbb7d2a8 RW |
665 | goto fail_bad; |
666 | } | |
667 | ||
668 | if (wl_pool_size > UBI_FM_MAX_POOL_SIZE || wl_pool_size < 0) { | |
32608703 | 669 | ubi_err(ubi, "bad WL pool size: %i", wl_pool_size); |
dbb7d2a8 RW |
670 | goto fail_bad; |
671 | } | |
672 | ||
673 | ||
674 | if (fm->max_pool_size > UBI_FM_MAX_POOL_SIZE || | |
675 | fm->max_pool_size < 0) { | |
32608703 | 676 | ubi_err(ubi, "bad maximal pool size: %i", fm->max_pool_size); |
dbb7d2a8 RW |
677 | goto fail_bad; |
678 | } | |
679 | ||
680 | if (fm->max_wl_pool_size > UBI_FM_MAX_POOL_SIZE || | |
681 | fm->max_wl_pool_size < 0) { | |
32608703 TB |
682 | ubi_err(ubi, "bad maximal WL pool size: %i", |
683 | fm->max_wl_pool_size); | |
dbb7d2a8 RW |
684 | goto fail_bad; |
685 | } | |
686 | ||
687 | /* read EC values from free list */ | |
688 | for (i = 0; i < be32_to_cpu(fmhdr->free_peb_count); i++) { | |
689 | fmec = (struct ubi_fm_ec *)(fm_raw + fm_pos); | |
690 | fm_pos += sizeof(*fmec); | |
691 | if (fm_pos >= fm_size) | |
692 | goto fail_bad; | |
693 | ||
694 | add_aeb(ai, &ai->free, be32_to_cpu(fmec->pnum), | |
695 | be32_to_cpu(fmec->ec), 0); | |
696 | } | |
697 | ||
698 | /* read EC values from used list */ | |
699 | for (i = 0; i < be32_to_cpu(fmhdr->used_peb_count); i++) { | |
700 | fmec = (struct ubi_fm_ec *)(fm_raw + fm_pos); | |
701 | fm_pos += sizeof(*fmec); | |
702 | if (fm_pos >= fm_size) | |
703 | goto fail_bad; | |
704 | ||
705 | add_aeb(ai, &used, be32_to_cpu(fmec->pnum), | |
706 | be32_to_cpu(fmec->ec), 0); | |
707 | } | |
708 | ||
709 | /* read EC values from scrub list */ | |
710 | for (i = 0; i < be32_to_cpu(fmhdr->scrub_peb_count); i++) { | |
711 | fmec = (struct ubi_fm_ec *)(fm_raw + fm_pos); | |
712 | fm_pos += sizeof(*fmec); | |
713 | if (fm_pos >= fm_size) | |
714 | goto fail_bad; | |
715 | ||
716 | add_aeb(ai, &used, be32_to_cpu(fmec->pnum), | |
717 | be32_to_cpu(fmec->ec), 1); | |
718 | } | |
719 | ||
720 | /* read EC values from erase list */ | |
721 | for (i = 0; i < be32_to_cpu(fmhdr->erase_peb_count); i++) { | |
722 | fmec = (struct ubi_fm_ec *)(fm_raw + fm_pos); | |
723 | fm_pos += sizeof(*fmec); | |
724 | if (fm_pos >= fm_size) | |
725 | goto fail_bad; | |
726 | ||
727 | add_aeb(ai, &ai->erase, be32_to_cpu(fmec->pnum), | |
728 | be32_to_cpu(fmec->ec), 1); | |
729 | } | |
730 | ||
731 | ai->mean_ec = div_u64(ai->ec_sum, ai->ec_count); | |
732 | ai->bad_peb_count = be32_to_cpu(fmhdr->bad_peb_count); | |
733 | ||
734 | /* Iterate over all volumes and read their EBA table */ | |
735 | for (i = 0; i < be32_to_cpu(fmhdr->vol_count); i++) { | |
736 | fmvhdr = (struct ubi_fm_volhdr *)(fm_raw + fm_pos); | |
737 | fm_pos += sizeof(*fmvhdr); | |
738 | if (fm_pos >= fm_size) | |
739 | goto fail_bad; | |
740 | ||
741 | if (be32_to_cpu(fmvhdr->magic) != UBI_FM_VHDR_MAGIC) { | |
32608703 | 742 | ubi_err(ubi, "bad fastmap vol header magic: 0x%x, expected: 0x%x", |
dbb7d2a8 RW |
743 | be32_to_cpu(fmvhdr->magic), UBI_FM_VHDR_MAGIC); |
744 | goto fail_bad; | |
745 | } | |
746 | ||
747 | av = add_vol(ai, be32_to_cpu(fmvhdr->vol_id), | |
748 | be32_to_cpu(fmvhdr->used_ebs), | |
749 | be32_to_cpu(fmvhdr->data_pad), | |
750 | fmvhdr->vol_type, | |
751 | be32_to_cpu(fmvhdr->last_eb_bytes)); | |
752 | ||
753 | if (!av) | |
754 | goto fail_bad; | |
e96a8a3b | 755 | if (PTR_ERR(av) == -EINVAL) { |
756 | ubi_err(ubi, "volume (ID %i) already exists", | |
757 | fmvhdr->vol_id); | |
758 | goto fail_bad; | |
759 | } | |
dbb7d2a8 RW |
760 | |
761 | ai->vols_found++; | |
762 | if (ai->highest_vol_id < be32_to_cpu(fmvhdr->vol_id)) | |
763 | ai->highest_vol_id = be32_to_cpu(fmvhdr->vol_id); | |
764 | ||
765 | fm_eba = (struct ubi_fm_eba *)(fm_raw + fm_pos); | |
766 | fm_pos += sizeof(*fm_eba); | |
767 | fm_pos += (sizeof(__be32) * be32_to_cpu(fm_eba->reserved_pebs)); | |
768 | if (fm_pos >= fm_size) | |
769 | goto fail_bad; | |
770 | ||
771 | if (be32_to_cpu(fm_eba->magic) != UBI_FM_EBA_MAGIC) { | |
32608703 | 772 | ubi_err(ubi, "bad fastmap EBA header magic: 0x%x, expected: 0x%x", |
dbb7d2a8 RW |
773 | be32_to_cpu(fm_eba->magic), UBI_FM_EBA_MAGIC); |
774 | goto fail_bad; | |
775 | } | |
776 | ||
777 | for (j = 0; j < be32_to_cpu(fm_eba->reserved_pebs); j++) { | |
778 | int pnum = be32_to_cpu(fm_eba->pnum[j]); | |
779 | ||
876f9a34 | 780 | if (pnum < 0) |
dbb7d2a8 RW |
781 | continue; |
782 | ||
783 | aeb = NULL; | |
784 | list_for_each_entry(tmp_aeb, &used, u.list) { | |
584d4623 | 785 | if (tmp_aeb->pnum == pnum) { |
dbb7d2a8 | 786 | aeb = tmp_aeb; |
584d4623 BP |
787 | break; |
788 | } | |
dbb7d2a8 RW |
789 | } |
790 | ||
dbb7d2a8 | 791 | if (!aeb) { |
d141a8ef RW |
792 | ubi_err(ubi, "PEB %i is in EBA but not in used list", pnum); |
793 | goto fail_bad; | |
dbb7d2a8 RW |
794 | } |
795 | ||
796 | aeb->lnum = j; | |
797 | ||
798 | if (av->highest_lnum <= aeb->lnum) | |
799 | av->highest_lnum = aeb->lnum; | |
800 | ||
801 | assign_aeb_to_av(ai, aeb, av); | |
802 | ||
803 | dbg_bld("inserting PEB:%i (LEB %i) to vol %i", | |
804 | aeb->pnum, aeb->lnum, av->vol_id); | |
805 | } | |
dbb7d2a8 RW |
806 | } |
807 | ||
f6e951af | 808 | ret = scan_pool(ubi, ai, fmpl->pebs, pool_size, &max_sqnum, &free); |
dbb7d2a8 RW |
809 | if (ret) |
810 | goto fail; | |
811 | ||
f6e951af | 812 | ret = scan_pool(ubi, ai, fmpl_wl->pebs, wl_pool_size, &max_sqnum, &free); |
dbb7d2a8 RW |
813 | if (ret) |
814 | goto fail; | |
815 | ||
816 | if (max_sqnum > ai->max_sqnum) | |
817 | ai->max_sqnum = max_sqnum; | |
818 | ||
6a059abd WY |
819 | list_for_each_entry_safe(tmp_aeb, _tmp_aeb, &free, u.list) |
820 | list_move_tail(&tmp_aeb->u.list, &ai->free); | |
dbb7d2a8 | 821 | |
a83832a7 RW |
822 | list_for_each_entry_safe(tmp_aeb, _tmp_aeb, &used, u.list) |
823 | list_move_tail(&tmp_aeb->u.list, &ai->erase); | |
824 | ||
ae0d1469 RW |
825 | ubi_assert(list_empty(&free)); |
826 | ||
dbb7d2a8 RW |
827 | /* |
828 | * If fastmap is leaking PEBs (must not happen), raise a | |
829 | * fat warning and fall back to scanning mode. | |
830 | * We do this here because in ubi_wl_init() it's too late | |
831 | * and we cannot fall back to scanning. | |
832 | */ | |
833 | if (WARN_ON(count_fastmap_pebs(ai) != ubi->peb_count - | |
834 | ai->bad_peb_count - fm->used_blocks)) | |
835 | goto fail_bad; | |
836 | ||
837 | return 0; | |
838 | ||
839 | fail_bad: | |
840 | ret = UBI_BAD_FASTMAP; | |
841 | fail: | |
fe24c6e5 | 842 | list_for_each_entry_safe(tmp_aeb, _tmp_aeb, &used, u.list) { |
fe24c6e5 | 843 | list_del(&tmp_aeb->u.list); |
5547fec7 | 844 | kmem_cache_free(ai->aeb_slab_cache, tmp_aeb); |
fe24c6e5 | 845 | } |
fe24c6e5 | 846 | list_for_each_entry_safe(tmp_aeb, _tmp_aeb, &free, u.list) { |
fe24c6e5 | 847 | list_del(&tmp_aeb->u.list); |
5547fec7 | 848 | kmem_cache_free(ai->aeb_slab_cache, tmp_aeb); |
fe24c6e5 RW |
849 | } |
850 | ||
dbb7d2a8 RW |
851 | return ret; |
852 | } | |
853 | ||
fdf10ed7 RW |
854 | /** |
855 | * find_fm_anchor - find the most recent Fastmap superblock (anchor) | |
856 | * @ai: UBI attach info to be filled | |
857 | */ | |
858 | static int find_fm_anchor(struct ubi_attach_info *ai) | |
859 | { | |
860 | int ret = -1; | |
861 | struct ubi_ainf_peb *aeb; | |
862 | unsigned long long max_sqnum = 0; | |
863 | ||
864 | list_for_each_entry(aeb, &ai->fastmap, u.list) { | |
865 | if (aeb->vol_id == UBI_FM_SB_VOLUME_ID && aeb->sqnum > max_sqnum) { | |
866 | max_sqnum = aeb->sqnum; | |
867 | ret = aeb->pnum; | |
868 | } | |
869 | } | |
870 | ||
871 | return ret; | |
872 | } | |
873 | ||
dbb7d2a8 RW |
874 | /** |
875 | * ubi_scan_fastmap - scan the fastmap. | |
876 | * @ubi: UBI device object | |
877 | * @ai: UBI attach info to be filled | |
fdf10ed7 RW |
878 | * @scan_ai: UBI attach info from the first 64 PEBs, |
879 | * used to find the most recent Fastmap data structure | |
dbb7d2a8 RW |
880 | * |
881 | * Returns 0 on success, UBI_NO_FASTMAP if no fastmap was found, | |
882 | * UBI_BAD_FASTMAP if one was found but is not usable. | |
883 | * < 0 indicates an internal error. | |
884 | */ | |
885 | int ubi_scan_fastmap(struct ubi_device *ubi, struct ubi_attach_info *ai, | |
fdf10ed7 | 886 | struct ubi_attach_info *scan_ai) |
dbb7d2a8 RW |
887 | { |
888 | struct ubi_fm_sb *fmsb, *fmsb2; | |
889 | struct ubi_vid_hdr *vh; | |
890 | struct ubi_ec_hdr *ech; | |
891 | struct ubi_fastmap_layout *fm; | |
fdf10ed7 RW |
892 | struct ubi_ainf_peb *tmp_aeb, *aeb; |
893 | int i, used_blocks, pnum, fm_anchor, ret = 0; | |
dbb7d2a8 RW |
894 | size_t fm_size; |
895 | __be32 crc, tmp_crc; | |
896 | unsigned long long sqnum = 0; | |
897 | ||
fdf10ed7 RW |
898 | fm_anchor = find_fm_anchor(scan_ai); |
899 | if (fm_anchor < 0) | |
900 | return UBI_NO_FASTMAP; | |
901 | ||
902 | /* Move all (possible) fastmap blocks into our new attach structure. */ | |
903 | list_for_each_entry_safe(aeb, tmp_aeb, &scan_ai->fastmap, u.list) | |
904 | list_move_tail(&aeb->u.list, &ai->fastmap); | |
905 | ||
111ab0b2 | 906 | down_write(&ubi->fm_protect); |
dbb7d2a8 RW |
907 | memset(ubi->fm_buf, 0, ubi->fm_size); |
908 | ||
909 | fmsb = kmalloc(sizeof(*fmsb), GFP_KERNEL); | |
910 | if (!fmsb) { | |
911 | ret = -ENOMEM; | |
912 | goto out; | |
913 | } | |
914 | ||
915 | fm = kzalloc(sizeof(*fm), GFP_KERNEL); | |
916 | if (!fm) { | |
917 | ret = -ENOMEM; | |
918 | kfree(fmsb); | |
919 | goto out; | |
920 | } | |
921 | ||
922 | ret = ubi_io_read(ubi, fmsb, fm_anchor, ubi->leb_start, sizeof(*fmsb)); | |
923 | if (ret && ret != UBI_IO_BITFLIPS) | |
924 | goto free_fm_sb; | |
925 | else if (ret == UBI_IO_BITFLIPS) | |
926 | fm->to_be_tortured[0] = 1; | |
927 | ||
928 | if (be32_to_cpu(fmsb->magic) != UBI_FM_SB_MAGIC) { | |
32608703 | 929 | ubi_err(ubi, "bad super block magic: 0x%x, expected: 0x%x", |
dbb7d2a8 RW |
930 | be32_to_cpu(fmsb->magic), UBI_FM_SB_MAGIC); |
931 | ret = UBI_BAD_FASTMAP; | |
932 | goto free_fm_sb; | |
933 | } | |
934 | ||
935 | if (fmsb->version != UBI_FM_FMT_VERSION) { | |
32608703 | 936 | ubi_err(ubi, "bad fastmap version: %i, expected: %i", |
dbb7d2a8 RW |
937 | fmsb->version, UBI_FM_FMT_VERSION); |
938 | ret = UBI_BAD_FASTMAP; | |
939 | goto free_fm_sb; | |
940 | } | |
941 | ||
942 | used_blocks = be32_to_cpu(fmsb->used_blocks); | |
943 | if (used_blocks > UBI_FM_MAX_BLOCKS || used_blocks < 1) { | |
32608703 TB |
944 | ubi_err(ubi, "number of fastmap blocks is invalid: %i", |
945 | used_blocks); | |
dbb7d2a8 RW |
946 | ret = UBI_BAD_FASTMAP; |
947 | goto free_fm_sb; | |
948 | } | |
949 | ||
950 | fm_size = ubi->leb_size * used_blocks; | |
951 | if (fm_size != ubi->fm_size) { | |
32608703 TB |
952 | ubi_err(ubi, "bad fastmap size: %zi, expected: %zi", |
953 | fm_size, ubi->fm_size); | |
dbb7d2a8 RW |
954 | ret = UBI_BAD_FASTMAP; |
955 | goto free_fm_sb; | |
956 | } | |
957 | ||
958 | ech = kzalloc(ubi->ec_hdr_alsize, GFP_KERNEL); | |
959 | if (!ech) { | |
960 | ret = -ENOMEM; | |
961 | goto free_fm_sb; | |
962 | } | |
963 | ||
964 | vh = ubi_zalloc_vid_hdr(ubi, GFP_KERNEL); | |
965 | if (!vh) { | |
966 | ret = -ENOMEM; | |
967 | goto free_hdr; | |
968 | } | |
969 | ||
970 | for (i = 0; i < used_blocks; i++) { | |
c22301ad RG |
971 | int image_seq; |
972 | ||
dbb7d2a8 RW |
973 | pnum = be32_to_cpu(fmsb->block_loc[i]); |
974 | ||
975 | if (ubi_io_is_bad(ubi, pnum)) { | |
976 | ret = UBI_BAD_FASTMAP; | |
977 | goto free_hdr; | |
978 | } | |
979 | ||
5283ec72 RW |
980 | if (i == 0 && pnum != fm_anchor) { |
981 | ubi_err(ubi, "Fastmap anchor PEB mismatch: PEB: %i vs. %i", | |
982 | pnum, fm_anchor); | |
983 | ret = UBI_BAD_FASTMAP; | |
984 | goto free_hdr; | |
985 | } | |
986 | ||
dbb7d2a8 RW |
987 | ret = ubi_io_read_ec_hdr(ubi, pnum, ech, 0); |
988 | if (ret && ret != UBI_IO_BITFLIPS) { | |
32608703 | 989 | ubi_err(ubi, "unable to read fastmap block# %i EC (PEB: %i)", |
dbb7d2a8 RW |
990 | i, pnum); |
991 | if (ret > 0) | |
992 | ret = UBI_BAD_FASTMAP; | |
993 | goto free_hdr; | |
994 | } else if (ret == UBI_IO_BITFLIPS) | |
995 | fm->to_be_tortured[i] = 1; | |
996 | ||
c22301ad | 997 | image_seq = be32_to_cpu(ech->image_seq); |
dbb7d2a8 | 998 | if (!ubi->image_seq) |
c22301ad | 999 | ubi->image_seq = image_seq; |
dbb7d2a8 | 1000 | |
c22301ad RG |
1001 | /* |
1002 | * Older UBI implementations have image_seq set to zero, so | |
1003 | * we shouldn't fail if image_seq == 0. | |
1004 | */ | |
1005 | if (image_seq && (image_seq != ubi->image_seq)) { | |
32608703 | 1006 | ubi_err(ubi, "wrong image seq:%d instead of %d", |
c22301ad | 1007 | be32_to_cpu(ech->image_seq), ubi->image_seq); |
dbb7d2a8 RW |
1008 | ret = UBI_BAD_FASTMAP; |
1009 | goto free_hdr; | |
1010 | } | |
1011 | ||
1012 | ret = ubi_io_read_vid_hdr(ubi, pnum, vh, 0); | |
1013 | if (ret && ret != UBI_IO_BITFLIPS) { | |
32608703 | 1014 | ubi_err(ubi, "unable to read fastmap block# %i (PEB: %i)", |
dbb7d2a8 RW |
1015 | i, pnum); |
1016 | goto free_hdr; | |
1017 | } | |
1018 | ||
1019 | if (i == 0) { | |
1020 | if (be32_to_cpu(vh->vol_id) != UBI_FM_SB_VOLUME_ID) { | |
32608703 | 1021 | ubi_err(ubi, "bad fastmap anchor vol_id: 0x%x, expected: 0x%x", |
dbb7d2a8 RW |
1022 | be32_to_cpu(vh->vol_id), |
1023 | UBI_FM_SB_VOLUME_ID); | |
1024 | ret = UBI_BAD_FASTMAP; | |
1025 | goto free_hdr; | |
1026 | } | |
1027 | } else { | |
1028 | if (be32_to_cpu(vh->vol_id) != UBI_FM_DATA_VOLUME_ID) { | |
32608703 | 1029 | ubi_err(ubi, "bad fastmap data vol_id: 0x%x, expected: 0x%x", |
dbb7d2a8 RW |
1030 | be32_to_cpu(vh->vol_id), |
1031 | UBI_FM_DATA_VOLUME_ID); | |
1032 | ret = UBI_BAD_FASTMAP; | |
1033 | goto free_hdr; | |
1034 | } | |
1035 | } | |
1036 | ||
1037 | if (sqnum < be64_to_cpu(vh->sqnum)) | |
1038 | sqnum = be64_to_cpu(vh->sqnum); | |
1039 | ||
1040 | ret = ubi_io_read(ubi, ubi->fm_buf + (ubi->leb_size * i), pnum, | |
1041 | ubi->leb_start, ubi->leb_size); | |
1042 | if (ret && ret != UBI_IO_BITFLIPS) { | |
32608703 | 1043 | ubi_err(ubi, "unable to read fastmap block# %i (PEB: %i, " |
dbb7d2a8 RW |
1044 | "err: %i)", i, pnum, ret); |
1045 | goto free_hdr; | |
1046 | } | |
1047 | } | |
1048 | ||
1049 | kfree(fmsb); | |
1050 | fmsb = NULL; | |
1051 | ||
1052 | fmsb2 = (struct ubi_fm_sb *)(ubi->fm_buf); | |
1053 | tmp_crc = be32_to_cpu(fmsb2->data_crc); | |
1054 | fmsb2->data_crc = 0; | |
1055 | crc = crc32(UBI_CRC32_INIT, ubi->fm_buf, fm_size); | |
1056 | if (crc != tmp_crc) { | |
32608703 TB |
1057 | ubi_err(ubi, "fastmap data CRC is invalid"); |
1058 | ubi_err(ubi, "CRC should be: 0x%x, calc: 0x%x", | |
1059 | tmp_crc, crc); | |
dbb7d2a8 RW |
1060 | ret = UBI_BAD_FASTMAP; |
1061 | goto free_hdr; | |
1062 | } | |
1063 | ||
1064 | fmsb2->sqnum = sqnum; | |
1065 | ||
1066 | fm->used_blocks = used_blocks; | |
1067 | ||
1068 | ret = ubi_attach_fastmap(ubi, ai, fm); | |
1069 | if (ret) { | |
1070 | if (ret > 0) | |
1071 | ret = UBI_BAD_FASTMAP; | |
1072 | goto free_hdr; | |
1073 | } | |
1074 | ||
1075 | for (i = 0; i < used_blocks; i++) { | |
1076 | struct ubi_wl_entry *e; | |
1077 | ||
1078 | e = kmem_cache_alloc(ubi_wl_entry_slab, GFP_KERNEL); | |
1079 | if (!e) { | |
1080 | while (i--) | |
1081 | kfree(fm->e[i]); | |
1082 | ||
1083 | ret = -ENOMEM; | |
1084 | goto free_hdr; | |
1085 | } | |
1086 | ||
1087 | e->pnum = be32_to_cpu(fmsb2->block_loc[i]); | |
1088 | e->ec = be32_to_cpu(fmsb2->block_ec[i]); | |
1089 | fm->e[i] = e; | |
1090 | } | |
1091 | ||
1092 | ubi->fm = fm; | |
1093 | ubi->fm_pool.max_size = ubi->fm->max_pool_size; | |
1094 | ubi->fm_wl_pool.max_size = ubi->fm->max_wl_pool_size; | |
32608703 TB |
1095 | ubi_msg(ubi, "attached by fastmap"); |
1096 | ubi_msg(ubi, "fastmap pool size: %d", ubi->fm_pool.max_size); | |
1097 | ubi_msg(ubi, "fastmap WL pool size: %d", | |
1098 | ubi->fm_wl_pool.max_size); | |
dbb7d2a8 | 1099 | ubi->fm_disabled = 0; |
1900149c | 1100 | ubi->fast_attach = 1; |
dbb7d2a8 RW |
1101 | |
1102 | ubi_free_vid_hdr(ubi, vh); | |
1103 | kfree(ech); | |
1104 | out: | |
111ab0b2 | 1105 | up_write(&ubi->fm_protect); |
dbb7d2a8 | 1106 | if (ret == UBI_BAD_FASTMAP) |
32608703 | 1107 | ubi_err(ubi, "Attach by fastmap failed, doing a full scan!"); |
dbb7d2a8 RW |
1108 | return ret; |
1109 | ||
1110 | free_hdr: | |
1111 | ubi_free_vid_hdr(ubi, vh); | |
1112 | kfree(ech); | |
1113 | free_fm_sb: | |
1114 | kfree(fmsb); | |
1115 | kfree(fm); | |
1116 | goto out; | |
1117 | } | |
1118 | ||
1119 | /** | |
1120 | * ubi_write_fastmap - writes a fastmap. | |
1121 | * @ubi: UBI device object | |
1122 | * @new_fm: the to be written fastmap | |
1123 | * | |
1124 | * Returns 0 on success, < 0 indicates an internal error. | |
1125 | */ | |
1126 | static int ubi_write_fastmap(struct ubi_device *ubi, | |
1127 | struct ubi_fastmap_layout *new_fm) | |
1128 | { | |
1129 | size_t fm_pos = 0; | |
1130 | void *fm_raw; | |
1131 | struct ubi_fm_sb *fmsb; | |
1132 | struct ubi_fm_hdr *fmh; | |
f6e951af | 1133 | struct ubi_fm_scan_pool *fmpl, *fmpl_wl; |
dbb7d2a8 RW |
1134 | struct ubi_fm_ec *fec; |
1135 | struct ubi_fm_volhdr *fvh; | |
1136 | struct ubi_fm_eba *feba; | |
dbb7d2a8 RW |
1137 | struct ubi_wl_entry *wl_e; |
1138 | struct ubi_volume *vol; | |
1139 | struct ubi_vid_hdr *avhdr, *dvhdr; | |
1140 | struct ubi_work *ubi_wrk; | |
c5c3f3cf | 1141 | struct rb_node *tmp_rb; |
dbb7d2a8 RW |
1142 | int ret, i, j, free_peb_count, used_peb_count, vol_count; |
1143 | int scrub_peb_count, erase_peb_count; | |
5d71afb0 | 1144 | unsigned long *seen_pebs = NULL; |
dbb7d2a8 RW |
1145 | |
1146 | fm_raw = ubi->fm_buf; | |
1147 | memset(ubi->fm_buf, 0, ubi->fm_size); | |
1148 | ||
1149 | avhdr = new_fm_vhdr(ubi, UBI_FM_SB_VOLUME_ID); | |
1150 | if (!avhdr) { | |
1151 | ret = -ENOMEM; | |
1152 | goto out; | |
1153 | } | |
1154 | ||
1155 | dvhdr = new_fm_vhdr(ubi, UBI_FM_DATA_VOLUME_ID); | |
1156 | if (!dvhdr) { | |
1157 | ret = -ENOMEM; | |
1158 | goto out_kfree; | |
1159 | } | |
1160 | ||
daef3dd1 RW |
1161 | seen_pebs = init_seen(ubi); |
1162 | if (IS_ERR(seen_pebs)) { | |
1163 | ret = PTR_ERR(seen_pebs); | |
1164 | goto out_kfree; | |
1165 | } | |
1166 | ||
dbb7d2a8 RW |
1167 | spin_lock(&ubi->volumes_lock); |
1168 | spin_lock(&ubi->wl_lock); | |
1169 | ||
1170 | fmsb = (struct ubi_fm_sb *)fm_raw; | |
1171 | fm_pos += sizeof(*fmsb); | |
1172 | ubi_assert(fm_pos <= ubi->fm_size); | |
1173 | ||
1174 | fmh = (struct ubi_fm_hdr *)(fm_raw + fm_pos); | |
1175 | fm_pos += sizeof(*fmh); | |
1176 | ubi_assert(fm_pos <= ubi->fm_size); | |
1177 | ||
1178 | fmsb->magic = cpu_to_be32(UBI_FM_SB_MAGIC); | |
1179 | fmsb->version = UBI_FM_FMT_VERSION; | |
1180 | fmsb->used_blocks = cpu_to_be32(new_fm->used_blocks); | |
1181 | /* the max sqnum will be filled in while *reading* the fastmap */ | |
1182 | fmsb->sqnum = 0; | |
1183 | ||
1184 | fmh->magic = cpu_to_be32(UBI_FM_HDR_MAGIC); | |
1185 | free_peb_count = 0; | |
1186 | used_peb_count = 0; | |
1187 | scrub_peb_count = 0; | |
1188 | erase_peb_count = 0; | |
1189 | vol_count = 0; | |
1190 | ||
f6e951af | 1191 | fmpl = (struct ubi_fm_scan_pool *)(fm_raw + fm_pos); |
1192 | fm_pos += sizeof(*fmpl); | |
1193 | fmpl->magic = cpu_to_be32(UBI_FM_POOL_MAGIC); | |
1194 | fmpl->size = cpu_to_be16(ubi->fm_pool.size); | |
1195 | fmpl->max_size = cpu_to_be16(ubi->fm_pool.max_size); | |
dbb7d2a8 | 1196 | |
daef3dd1 | 1197 | for (i = 0; i < ubi->fm_pool.size; i++) { |
f6e951af | 1198 | fmpl->pebs[i] = cpu_to_be32(ubi->fm_pool.pebs[i]); |
daef3dd1 RW |
1199 | set_seen(ubi, ubi->fm_pool.pebs[i], seen_pebs); |
1200 | } | |
dbb7d2a8 | 1201 | |
f6e951af | 1202 | fmpl_wl = (struct ubi_fm_scan_pool *)(fm_raw + fm_pos); |
1203 | fm_pos += sizeof(*fmpl_wl); | |
1204 | fmpl_wl->magic = cpu_to_be32(UBI_FM_POOL_MAGIC); | |
1205 | fmpl_wl->size = cpu_to_be16(ubi->fm_wl_pool.size); | |
1206 | fmpl_wl->max_size = cpu_to_be16(ubi->fm_wl_pool.max_size); | |
dbb7d2a8 | 1207 | |
daef3dd1 | 1208 | for (i = 0; i < ubi->fm_wl_pool.size; i++) { |
f6e951af | 1209 | fmpl_wl->pebs[i] = cpu_to_be32(ubi->fm_wl_pool.pebs[i]); |
daef3dd1 RW |
1210 | set_seen(ubi, ubi->fm_wl_pool.pebs[i], seen_pebs); |
1211 | } | |
dbb7d2a8 | 1212 | |
c5c3f3cf | 1213 | ubi_for_each_free_peb(ubi, wl_e, tmp_rb) { |
dbb7d2a8 RW |
1214 | fec = (struct ubi_fm_ec *)(fm_raw + fm_pos); |
1215 | ||
1216 | fec->pnum = cpu_to_be32(wl_e->pnum); | |
daef3dd1 | 1217 | set_seen(ubi, wl_e->pnum, seen_pebs); |
dbb7d2a8 RW |
1218 | fec->ec = cpu_to_be32(wl_e->ec); |
1219 | ||
1220 | free_peb_count++; | |
1221 | fm_pos += sizeof(*fec); | |
1222 | ubi_assert(fm_pos <= ubi->fm_size); | |
1223 | } | |
1224 | fmh->free_peb_count = cpu_to_be32(free_peb_count); | |
1225 | ||
c5c3f3cf | 1226 | ubi_for_each_used_peb(ubi, wl_e, tmp_rb) { |
dbb7d2a8 RW |
1227 | fec = (struct ubi_fm_ec *)(fm_raw + fm_pos); |
1228 | ||
1229 | fec->pnum = cpu_to_be32(wl_e->pnum); | |
daef3dd1 | 1230 | set_seen(ubi, wl_e->pnum, seen_pebs); |
dbb7d2a8 RW |
1231 | fec->ec = cpu_to_be32(wl_e->ec); |
1232 | ||
1233 | used_peb_count++; | |
1234 | fm_pos += sizeof(*fec); | |
1235 | ubi_assert(fm_pos <= ubi->fm_size); | |
1236 | } | |
4f5e3b6f | 1237 | |
c5c3f3cf RW |
1238 | ubi_for_each_protected_peb(ubi, i, wl_e) { |
1239 | fec = (struct ubi_fm_ec *)(fm_raw + fm_pos); | |
4f5e3b6f | 1240 | |
c5c3f3cf RW |
1241 | fec->pnum = cpu_to_be32(wl_e->pnum); |
1242 | set_seen(ubi, wl_e->pnum, seen_pebs); | |
1243 | fec->ec = cpu_to_be32(wl_e->ec); | |
4f5e3b6f | 1244 | |
c5c3f3cf RW |
1245 | used_peb_count++; |
1246 | fm_pos += sizeof(*fec); | |
1247 | ubi_assert(fm_pos <= ubi->fm_size); | |
4f5e3b6f | 1248 | } |
dbb7d2a8 RW |
1249 | fmh->used_peb_count = cpu_to_be32(used_peb_count); |
1250 | ||
c5c3f3cf | 1251 | ubi_for_each_scrub_peb(ubi, wl_e, tmp_rb) { |
dbb7d2a8 RW |
1252 | fec = (struct ubi_fm_ec *)(fm_raw + fm_pos); |
1253 | ||
1254 | fec->pnum = cpu_to_be32(wl_e->pnum); | |
daef3dd1 | 1255 | set_seen(ubi, wl_e->pnum, seen_pebs); |
dbb7d2a8 RW |
1256 | fec->ec = cpu_to_be32(wl_e->ec); |
1257 | ||
1258 | scrub_peb_count++; | |
1259 | fm_pos += sizeof(*fec); | |
1260 | ubi_assert(fm_pos <= ubi->fm_size); | |
1261 | } | |
1262 | fmh->scrub_peb_count = cpu_to_be32(scrub_peb_count); | |
1263 | ||
1264 | ||
1265 | list_for_each_entry(ubi_wrk, &ubi->works, list) { | |
1266 | if (ubi_is_erase_work(ubi_wrk)) { | |
1267 | wl_e = ubi_wrk->e; | |
1268 | ubi_assert(wl_e); | |
1269 | ||
1270 | fec = (struct ubi_fm_ec *)(fm_raw + fm_pos); | |
1271 | ||
1272 | fec->pnum = cpu_to_be32(wl_e->pnum); | |
daef3dd1 | 1273 | set_seen(ubi, wl_e->pnum, seen_pebs); |
dbb7d2a8 RW |
1274 | fec->ec = cpu_to_be32(wl_e->ec); |
1275 | ||
1276 | erase_peb_count++; | |
1277 | fm_pos += sizeof(*fec); | |
1278 | ubi_assert(fm_pos <= ubi->fm_size); | |
1279 | } | |
1280 | } | |
1281 | fmh->erase_peb_count = cpu_to_be32(erase_peb_count); | |
1282 | ||
1283 | for (i = 0; i < UBI_MAX_VOLUMES + UBI_INT_VOL_COUNT; i++) { | |
1284 | vol = ubi->volumes[i]; | |
1285 | ||
1286 | if (!vol) | |
1287 | continue; | |
1288 | ||
1289 | vol_count++; | |
1290 | ||
1291 | fvh = (struct ubi_fm_volhdr *)(fm_raw + fm_pos); | |
1292 | fm_pos += sizeof(*fvh); | |
1293 | ubi_assert(fm_pos <= ubi->fm_size); | |
1294 | ||
1295 | fvh->magic = cpu_to_be32(UBI_FM_VHDR_MAGIC); | |
1296 | fvh->vol_id = cpu_to_be32(vol->vol_id); | |
1297 | fvh->vol_type = vol->vol_type; | |
1298 | fvh->used_ebs = cpu_to_be32(vol->used_ebs); | |
1299 | fvh->data_pad = cpu_to_be32(vol->data_pad); | |
1300 | fvh->last_eb_bytes = cpu_to_be32(vol->last_eb_bytes); | |
1301 | ||
1302 | ubi_assert(vol->vol_type == UBI_DYNAMIC_VOLUME || | |
1303 | vol->vol_type == UBI_STATIC_VOLUME); | |
1304 | ||
1305 | feba = (struct ubi_fm_eba *)(fm_raw + fm_pos); | |
1306 | fm_pos += sizeof(*feba) + (sizeof(__be32) * vol->reserved_pebs); | |
1307 | ubi_assert(fm_pos <= ubi->fm_size); | |
1308 | ||
1309 | for (j = 0; j < vol->reserved_pebs; j++) | |
1310 | feba->pnum[j] = cpu_to_be32(vol->eba_tbl[j]); | |
1311 | ||
1312 | feba->reserved_pebs = cpu_to_be32(j); | |
1313 | feba->magic = cpu_to_be32(UBI_FM_EBA_MAGIC); | |
1314 | } | |
1315 | fmh->vol_count = cpu_to_be32(vol_count); | |
1316 | fmh->bad_peb_count = cpu_to_be32(ubi->bad_peb_count); | |
1317 | ||
1318 | avhdr->sqnum = cpu_to_be64(ubi_next_sqnum(ubi)); | |
1319 | avhdr->lnum = 0; | |
1320 | ||
1321 | spin_unlock(&ubi->wl_lock); | |
1322 | spin_unlock(&ubi->volumes_lock); | |
1323 | ||
1324 | dbg_bld("writing fastmap SB to PEB %i", new_fm->e[0]->pnum); | |
1325 | ret = ubi_io_write_vid_hdr(ubi, new_fm->e[0]->pnum, avhdr); | |
1326 | if (ret) { | |
32608703 | 1327 | ubi_err(ubi, "unable to write vid_hdr to fastmap SB!"); |
dbb7d2a8 RW |
1328 | goto out_kfree; |
1329 | } | |
1330 | ||
1331 | for (i = 0; i < new_fm->used_blocks; i++) { | |
1332 | fmsb->block_loc[i] = cpu_to_be32(new_fm->e[i]->pnum); | |
daef3dd1 | 1333 | set_seen(ubi, new_fm->e[i]->pnum, seen_pebs); |
dbb7d2a8 RW |
1334 | fmsb->block_ec[i] = cpu_to_be32(new_fm->e[i]->ec); |
1335 | } | |
1336 | ||
1337 | fmsb->data_crc = 0; | |
1338 | fmsb->data_crc = cpu_to_be32(crc32(UBI_CRC32_INIT, fm_raw, | |
1339 | ubi->fm_size)); | |
1340 | ||
1341 | for (i = 1; i < new_fm->used_blocks; i++) { | |
1342 | dvhdr->sqnum = cpu_to_be64(ubi_next_sqnum(ubi)); | |
1343 | dvhdr->lnum = cpu_to_be32(i); | |
1344 | dbg_bld("writing fastmap data to PEB %i sqnum %llu", | |
1345 | new_fm->e[i]->pnum, be64_to_cpu(dvhdr->sqnum)); | |
1346 | ret = ubi_io_write_vid_hdr(ubi, new_fm->e[i]->pnum, dvhdr); | |
1347 | if (ret) { | |
32608703 | 1348 | ubi_err(ubi, "unable to write vid_hdr to PEB %i!", |
dbb7d2a8 RW |
1349 | new_fm->e[i]->pnum); |
1350 | goto out_kfree; | |
1351 | } | |
1352 | } | |
1353 | ||
1354 | for (i = 0; i < new_fm->used_blocks; i++) { | |
1355 | ret = ubi_io_write(ubi, fm_raw + (i * ubi->leb_size), | |
1356 | new_fm->e[i]->pnum, ubi->leb_start, ubi->leb_size); | |
1357 | if (ret) { | |
32608703 | 1358 | ubi_err(ubi, "unable to write fastmap to PEB %i!", |
dbb7d2a8 RW |
1359 | new_fm->e[i]->pnum); |
1360 | goto out_kfree; | |
1361 | } | |
1362 | } | |
1363 | ||
1364 | ubi_assert(new_fm); | |
1365 | ubi->fm = new_fm; | |
1366 | ||
daef3dd1 | 1367 | ret = self_check_seen(ubi, seen_pebs); |
dbb7d2a8 RW |
1368 | dbg_bld("fastmap written!"); |
1369 | ||
1370 | out_kfree: | |
1371 | ubi_free_vid_hdr(ubi, avhdr); | |
1372 | ubi_free_vid_hdr(ubi, dvhdr); | |
daef3dd1 | 1373 | free_seen(seen_pebs); |
dbb7d2a8 RW |
1374 | out: |
1375 | return ret; | |
1376 | } | |
1377 | ||
1378 | /** | |
1379 | * erase_block - Manually erase a PEB. | |
1380 | * @ubi: UBI device object | |
1381 | * @pnum: PEB to be erased | |
1382 | * | |
1383 | * Returns the new EC value on success, < 0 indicates an internal error. | |
1384 | */ | |
1385 | static int erase_block(struct ubi_device *ubi, int pnum) | |
1386 | { | |
1387 | int ret; | |
1388 | struct ubi_ec_hdr *ec_hdr; | |
1389 | long long ec; | |
1390 | ||
1391 | ec_hdr = kzalloc(ubi->ec_hdr_alsize, GFP_KERNEL); | |
1392 | if (!ec_hdr) | |
1393 | return -ENOMEM; | |
1394 | ||
1395 | ret = ubi_io_read_ec_hdr(ubi, pnum, ec_hdr, 0); | |
1396 | if (ret < 0) | |
1397 | goto out; | |
1398 | else if (ret && ret != UBI_IO_BITFLIPS) { | |
1399 | ret = -EINVAL; | |
1400 | goto out; | |
1401 | } | |
1402 | ||
1403 | ret = ubi_io_sync_erase(ubi, pnum, 0); | |
1404 | if (ret < 0) | |
1405 | goto out; | |
1406 | ||
1407 | ec = be64_to_cpu(ec_hdr->ec); | |
1408 | ec += ret; | |
1409 | if (ec > UBI_MAX_ERASECOUNTER) { | |
1410 | ret = -EINVAL; | |
1411 | goto out; | |
1412 | } | |
1413 | ||
1414 | ec_hdr->ec = cpu_to_be64(ec); | |
1415 | ret = ubi_io_write_ec_hdr(ubi, pnum, ec_hdr); | |
1416 | if (ret < 0) | |
1417 | goto out; | |
1418 | ||
1419 | ret = ec; | |
1420 | out: | |
1421 | kfree(ec_hdr); | |
1422 | return ret; | |
1423 | } | |
1424 | ||
1425 | /** | |
1426 | * invalidate_fastmap - destroys a fastmap. | |
1427 | * @ubi: UBI device object | |
dbb7d2a8 | 1428 | * |
5ca97ad8 RW |
1429 | * This function ensures that upon next UBI attach a full scan |
1430 | * is issued. We need this if UBI is about to write a new fastmap | |
1431 | * but is unable to do so. In this case we have two options: | |
1432 | * a) Make sure that the current fastmap will not be usued upon | |
1433 | * attach time and contine or b) fall back to RO mode to have the | |
1434 | * current fastmap in a valid state. | |
dbb7d2a8 RW |
1435 | * Returns 0 on success, < 0 indicates an internal error. |
1436 | */ | |
5ca97ad8 | 1437 | static int invalidate_fastmap(struct ubi_device *ubi) |
dbb7d2a8 | 1438 | { |
8930fa50 | 1439 | int ret; |
5ca97ad8 RW |
1440 | struct ubi_fastmap_layout *fm; |
1441 | struct ubi_wl_entry *e; | |
1442 | struct ubi_vid_hdr *vh = NULL; | |
dbb7d2a8 | 1443 | |
5ca97ad8 RW |
1444 | if (!ubi->fm) |
1445 | return 0; | |
1446 | ||
1447 | ubi->fm = NULL; | |
1448 | ||
1449 | ret = -ENOMEM; | |
1450 | fm = kzalloc(sizeof(*fm), GFP_KERNEL); | |
1451 | if (!fm) | |
1452 | goto out; | |
dbb7d2a8 RW |
1453 | |
1454 | vh = new_fm_vhdr(ubi, UBI_FM_SB_VOLUME_ID); | |
1455 | if (!vh) | |
5ca97ad8 RW |
1456 | goto out_free_fm; |
1457 | ||
1458 | ret = -ENOSPC; | |
1459 | e = ubi_wl_get_fm_peb(ubi, 1); | |
1460 | if (!e) | |
1461 | goto out_free_fm; | |
dbb7d2a8 | 1462 | |
5ca97ad8 RW |
1463 | /* |
1464 | * Create fake fastmap such that UBI will fall back | |
1465 | * to scanning mode. | |
1466 | */ | |
dbb7d2a8 | 1467 | vh->sqnum = cpu_to_be64(ubi_next_sqnum(ubi)); |
5ca97ad8 RW |
1468 | ret = ubi_io_write_vid_hdr(ubi, e->pnum, vh); |
1469 | if (ret < 0) { | |
1470 | ubi_wl_put_fm_peb(ubi, e, 0, 0); | |
1471 | goto out_free_fm; | |
1472 | } | |
dbb7d2a8 | 1473 | |
5ca97ad8 RW |
1474 | fm->used_blocks = 1; |
1475 | fm->e[0] = e; | |
1476 | ||
1477 | ubi->fm = fm; | |
1478 | ||
1479 | out: | |
1480 | ubi_free_vid_hdr(ubi, vh); | |
dbb7d2a8 | 1481 | return ret; |
5ca97ad8 RW |
1482 | |
1483 | out_free_fm: | |
1484 | kfree(fm); | |
1485 | goto out; | |
1486 | } | |
1487 | ||
1488 | /** | |
1489 | * return_fm_pebs - returns all PEBs used by a fastmap back to the | |
1490 | * WL sub-system. | |
1491 | * @ubi: UBI device object | |
1492 | * @fm: fastmap layout object | |
1493 | */ | |
1494 | static void return_fm_pebs(struct ubi_device *ubi, | |
1495 | struct ubi_fastmap_layout *fm) | |
1496 | { | |
1497 | int i; | |
1498 | ||
1499 | if (!fm) | |
1500 | return; | |
1501 | ||
1502 | for (i = 0; i < fm->used_blocks; i++) { | |
1503 | if (fm->e[i]) { | |
1504 | ubi_wl_put_fm_peb(ubi, fm->e[i], i, | |
1505 | fm->to_be_tortured[i]); | |
1506 | fm->e[i] = NULL; | |
1507 | } | |
1508 | } | |
dbb7d2a8 RW |
1509 | } |
1510 | ||
1511 | /** | |
1512 | * ubi_update_fastmap - will be called by UBI if a volume changes or | |
1513 | * a fastmap pool becomes full. | |
1514 | * @ubi: UBI device object | |
1515 | * | |
1516 | * Returns 0 on success, < 0 indicates an internal error. | |
1517 | */ | |
1518 | int ubi_update_fastmap(struct ubi_device *ubi) | |
1519 | { | |
5ca97ad8 | 1520 | int ret, i, j; |
dbb7d2a8 RW |
1521 | struct ubi_fastmap_layout *new_fm, *old_fm; |
1522 | struct ubi_wl_entry *tmp_e; | |
1523 | ||
111ab0b2 | 1524 | down_write(&ubi->fm_protect); |
dbb7d2a8 RW |
1525 | |
1526 | ubi_refill_pools(ubi); | |
1527 | ||
1528 | if (ubi->ro_mode || ubi->fm_disabled) { | |
111ab0b2 | 1529 | up_write(&ubi->fm_protect); |
dbb7d2a8 RW |
1530 | return 0; |
1531 | } | |
1532 | ||
1533 | ret = ubi_ensure_anchor_pebs(ubi); | |
1534 | if (ret) { | |
111ab0b2 | 1535 | up_write(&ubi->fm_protect); |
dbb7d2a8 RW |
1536 | return ret; |
1537 | } | |
1538 | ||
1539 | new_fm = kzalloc(sizeof(*new_fm), GFP_KERNEL); | |
1540 | if (!new_fm) { | |
111ab0b2 | 1541 | up_write(&ubi->fm_protect); |
dbb7d2a8 RW |
1542 | return -ENOMEM; |
1543 | } | |
1544 | ||
1545 | new_fm->used_blocks = ubi->fm_size / ubi->leb_size; | |
dbb7d2a8 RW |
1546 | old_fm = ubi->fm; |
1547 | ubi->fm = NULL; | |
1548 | ||
1549 | if (new_fm->used_blocks > UBI_FM_MAX_BLOCKS) { | |
32608703 | 1550 | ubi_err(ubi, "fastmap too large"); |
dbb7d2a8 RW |
1551 | ret = -ENOSPC; |
1552 | goto err; | |
1553 | } | |
1554 | ||
1555 | for (i = 1; i < new_fm->used_blocks; i++) { | |
1556 | spin_lock(&ubi->wl_lock); | |
1557 | tmp_e = ubi_wl_get_fm_peb(ubi, 0); | |
1558 | spin_unlock(&ubi->wl_lock); | |
1559 | ||
5ca97ad8 RW |
1560 | if (!tmp_e) { |
1561 | if (old_fm && old_fm->e[i]) { | |
1562 | ret = erase_block(ubi, old_fm->e[i]->pnum); | |
1563 | if (ret < 0) { | |
1564 | ubi_err(ubi, "could not erase old fastmap PEB"); | |
1565 | ||
1566 | for (j = 1; j < i; j++) { | |
1567 | ubi_wl_put_fm_peb(ubi, new_fm->e[j], | |
1568 | j, 0); | |
1569 | new_fm->e[j] = NULL; | |
1570 | } | |
1571 | goto err; | |
1572 | } | |
1573 | new_fm->e[i] = old_fm->e[i]; | |
1574 | old_fm->e[i] = NULL; | |
1575 | } else { | |
1576 | ubi_err(ubi, "could not get any free erase block"); | |
1577 | ||
1578 | for (j = 1; j < i; j++) { | |
1579 | ubi_wl_put_fm_peb(ubi, new_fm->e[j], j, 0); | |
1580 | new_fm->e[j] = NULL; | |
1581 | } | |
dbb7d2a8 | 1582 | |
5ca97ad8 | 1583 | ret = -ENOSPC; |
dbb7d2a8 RW |
1584 | goto err; |
1585 | } | |
dbb7d2a8 | 1586 | } else { |
c4ca6be9 | 1587 | new_fm->e[i] = tmp_e; |
dbb7d2a8 | 1588 | |
5ca97ad8 | 1589 | if (old_fm && old_fm->e[i]) { |
dbb7d2a8 RW |
1590 | ubi_wl_put_fm_peb(ubi, old_fm->e[i], i, |
1591 | old_fm->to_be_tortured[i]); | |
5ca97ad8 RW |
1592 | old_fm->e[i] = NULL; |
1593 | } | |
dbb7d2a8 RW |
1594 | } |
1595 | } | |
1596 | ||
61de74ce RW |
1597 | /* Old fastmap is larger than the new one */ |
1598 | if (old_fm && new_fm->used_blocks < old_fm->used_blocks) { | |
1599 | for (i = new_fm->used_blocks; i < old_fm->used_blocks; i++) { | |
1600 | ubi_wl_put_fm_peb(ubi, old_fm->e[i], i, | |
1601 | old_fm->to_be_tortured[i]); | |
5ca97ad8 | 1602 | old_fm->e[i] = NULL; |
61de74ce RW |
1603 | } |
1604 | } | |
1605 | ||
dbb7d2a8 RW |
1606 | spin_lock(&ubi->wl_lock); |
1607 | tmp_e = ubi_wl_get_fm_peb(ubi, 1); | |
1608 | spin_unlock(&ubi->wl_lock); | |
1609 | ||
1610 | if (old_fm) { | |
1611 | /* no fresh anchor PEB was found, reuse the old one */ | |
1612 | if (!tmp_e) { | |
1613 | ret = erase_block(ubi, old_fm->e[0]->pnum); | |
1614 | if (ret < 0) { | |
32608703 | 1615 | ubi_err(ubi, "could not erase old anchor PEB"); |
dbb7d2a8 | 1616 | |
5ca97ad8 | 1617 | for (i = 1; i < new_fm->used_blocks; i++) { |
dbb7d2a8 RW |
1618 | ubi_wl_put_fm_peb(ubi, new_fm->e[i], |
1619 | i, 0); | |
5ca97ad8 RW |
1620 | new_fm->e[i] = NULL; |
1621 | } | |
dbb7d2a8 RW |
1622 | goto err; |
1623 | } | |
c4ca6be9 | 1624 | new_fm->e[0] = old_fm->e[0]; |
dbb7d2a8 | 1625 | new_fm->e[0]->ec = ret; |
5ca97ad8 | 1626 | old_fm->e[0] = NULL; |
dbb7d2a8 RW |
1627 | } else { |
1628 | /* we've got a new anchor PEB, return the old one */ | |
1629 | ubi_wl_put_fm_peb(ubi, old_fm->e[0], 0, | |
1630 | old_fm->to_be_tortured[0]); | |
c4ca6be9 | 1631 | new_fm->e[0] = tmp_e; |
5ca97ad8 | 1632 | old_fm->e[0] = NULL; |
dbb7d2a8 RW |
1633 | } |
1634 | } else { | |
1635 | if (!tmp_e) { | |
32608703 | 1636 | ubi_err(ubi, "could not find any anchor PEB"); |
dbb7d2a8 | 1637 | |
5ca97ad8 | 1638 | for (i = 1; i < new_fm->used_blocks; i++) { |
dbb7d2a8 | 1639 | ubi_wl_put_fm_peb(ubi, new_fm->e[i], i, 0); |
5ca97ad8 RW |
1640 | new_fm->e[i] = NULL; |
1641 | } | |
dbb7d2a8 RW |
1642 | |
1643 | ret = -ENOSPC; | |
1644 | goto err; | |
1645 | } | |
c4ca6be9 | 1646 | new_fm->e[0] = tmp_e; |
dbb7d2a8 RW |
1647 | } |
1648 | ||
1649 | down_write(&ubi->work_sem); | |
111ab0b2 | 1650 | down_write(&ubi->fm_eba_sem); |
dbb7d2a8 | 1651 | ret = ubi_write_fastmap(ubi, new_fm); |
111ab0b2 | 1652 | up_write(&ubi->fm_eba_sem); |
dbb7d2a8 RW |
1653 | up_write(&ubi->work_sem); |
1654 | ||
1655 | if (ret) | |
1656 | goto err; | |
1657 | ||
1658 | out_unlock: | |
111ab0b2 | 1659 | up_write(&ubi->fm_protect); |
dbb7d2a8 RW |
1660 | kfree(old_fm); |
1661 | return ret; | |
1662 | ||
1663 | err: | |
32608703 | 1664 | ubi_warn(ubi, "Unable to write new fastmap, err=%i", ret); |
dbb7d2a8 | 1665 | |
5ca97ad8 RW |
1666 | ret = invalidate_fastmap(ubi); |
1667 | if (ret < 0) { | |
1668 | ubi_err(ubi, "Unable to invalidiate current fastmap!"); | |
1669 | ubi_ro_mode(ubi); | |
1670 | } else { | |
1671 | return_fm_pebs(ubi, old_fm); | |
1672 | return_fm_pebs(ubi, new_fm); | |
1673 | ret = 0; | |
dbb7d2a8 | 1674 | } |
5ca97ad8 RW |
1675 | |
1676 | kfree(new_fm); | |
dbb7d2a8 RW |
1677 | goto out_unlock; |
1678 | } |