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