projects / deliverable / linux.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
UBI: Fastmap: Switch to ro mode if invalidate_fastmap() fails
[deliverable/linux.git] / drivers / mtd / ubi / fastmap.c
CommitLineData
dbb7d2a8
RW		 1/*
2 * Copyright (c) 2012 Linutronix GmbH
3 * Author: Richard Weinberger <richard@nod.at>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; version 2.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
12 * the GNU General Public License for more details.
13 *
14 */
15
16#include <linux/crc32.h>
17#include "ubi.h"
18
19/**
20 * ubi_calc_fm_size - calculates the fastmap size in bytes for an UBI device.
21 * @ubi: UBI device description object
22 */
23size_t ubi_calc_fm_size(struct ubi_device *ubi)
24{
25 size_t size;
26
91401a34
RW		 27 size = sizeof(struct ubi_fm_sb) + \
28 sizeof(struct ubi_fm_hdr) + \
dbb7d2a8
RW		 29 sizeof(struct ubi_fm_scan_pool) + \
30 sizeof(struct ubi_fm_scan_pool) + \
31 (ubi->peb_count * sizeof(struct ubi_fm_ec)) + \
32 (sizeof(struct ubi_fm_eba) + \
33 (ubi->peb_count * sizeof(__be32))) + \
34 sizeof(struct ubi_fm_volhdr) * UBI_MAX_VOLUMES;
35 return roundup(size, ubi->leb_size);
36}
37
38
39/**
40 * new_fm_vhdr - allocate a new volume header for fastmap usage.
41 * @ubi: UBI device description object
42 * @vol_id: the VID of the new header
43 *
44 * Returns a new struct ubi_vid_hdr on success.
45 * NULL indicates out of memory.
46 */
47static struct ubi_vid_hdr *new_fm_vhdr(struct ubi_device *ubi, int vol_id)
48{
49 struct ubi_vid_hdr *new;
50
51 new = ubi_zalloc_vid_hdr(ubi, GFP_KERNEL);
52 if (!new)
53 goto out;
54
55 new->vol_type = UBI_VID_DYNAMIC;
56 new->vol_id = cpu_to_be32(vol_id);
57
58 /* UBI implementations without fastmap support have to delete the
59 * fastmap.
60 */
61 new->compat = UBI_COMPAT_DELETE;
62
63out:
64 return new;
65}
66
67/**
68 * add_aeb - create and add a attach erase block to a given list.
69 * @ai: UBI attach info object
70 * @list: the target list
71 * @pnum: PEB number of the new attach erase block
72 * @ec: erease counter of the new LEB
73 * @scrub: scrub this PEB after attaching
74 *
75 * Returns 0 on success, < 0 indicates an internal error.
76 */
77static int add_aeb(struct ubi_attach_info *ai, struct list_head *list,
78 int pnum, int ec, int scrub)
79{
80 struct ubi_ainf_peb *aeb;
81
82 aeb = kmem_cache_alloc(ai->aeb_slab_cache, GFP_KERNEL);
83 if (!aeb)
84 return -ENOMEM;
85
86 aeb->pnum = pnum;
87 aeb->ec = ec;
88 aeb->lnum = -1;
89 aeb->scrub = scrub;
90 aeb->copy_flag = aeb->sqnum = 0;
91
92 ai->ec_sum += aeb->ec;
93 ai->ec_count++;
94
95 if (ai->max_ec < aeb->ec)
96 ai->max_ec = aeb->ec;
97
98 if (ai->min_ec > aeb->ec)
99 ai->min_ec = aeb->ec;
100
101 list_add_tail(&aeb->u.list, list);
102
103 return 0;
104}
105
106/**
107 * add_vol - create and add a new volume to ubi_attach_info.
108 * @ai: ubi_attach_info object
109 * @vol_id: VID of the new volume
110 * @used_ebs: number of used EBS
111 * @data_pad: data padding value of the new volume
112 * @vol_type: volume type
113 * @last_eb_bytes: number of bytes in the last LEB
114 *
115 * Returns the new struct ubi_ainf_volume on success.
116 * NULL indicates an error.
117 */
118static struct ubi_ainf_volume *add_vol(struct ubi_attach_info *ai, int vol_id,
119 int used_ebs, int data_pad, u8 vol_type,
120 int last_eb_bytes)
121{
122 struct ubi_ainf_volume *av;
123 struct rb_node **p = &ai->volumes.rb_node, *parent = NULL;
124
125 while (*p) {
126 parent = *p;
127 av = rb_entry(parent, struct ubi_ainf_volume, rb);
128
e9110361 129 if (vol_id > av->vol_id)
dbb7d2a8 130 p = &(*p)->rb_left;
604b592e 131 else
dbb7d2a8
RW		 132 p = &(*p)->rb_right;
133 }
134
135 av = kmalloc(sizeof(struct ubi_ainf_volume), GFP_KERNEL);
136 if (!av)
137 goto out;
138
139 av->highest_lnum = av->leb_count = 0;
140 av->vol_id = vol_id;
141 av->used_ebs = used_ebs;
142 av->data_pad = data_pad;
143 av->last_data_size = last_eb_bytes;
144 av->compat = 0;
145 av->vol_type = vol_type;
146 av->root = RB_ROOT;
147
148 dbg_bld("found volume (ID %i)", vol_id);
149
150 rb_link_node(&av->rb, parent, p);
151 rb_insert_color(&av->rb, &ai->volumes);
152
153out:
154 return av;
155}
156
157/**
158 * assign_aeb_to_av - assigns a SEB to a given ainf_volume and removes it
159 * from it's original list.
160 * @ai: ubi_attach_info object
161 * @aeb: the to be assigned SEB
162 * @av: target scan volume
163 */
164static void assign_aeb_to_av(struct ubi_attach_info *ai,
165 struct ubi_ainf_peb *aeb,
166 struct ubi_ainf_volume *av)
167{
168 struct ubi_ainf_peb *tmp_aeb;
169 struct rb_node **p = &ai->volumes.rb_node, *parent = NULL;
170
171 p = &av->root.rb_node;
172 while (*p) {
173 parent = *p;
174
175 tmp_aeb = rb_entry(parent, struct ubi_ainf_peb, u.rb);
176 if (aeb->lnum != tmp_aeb->lnum) {
177 if (aeb->lnum < tmp_aeb->lnum)
178 p = &(*p)->rb_left;
179 else
180 p = &(*p)->rb_right;
181
182 continue;
183 } else
184 break;
185 }
186
187 list_del(&aeb->u.list);
188 av->leb_count++;
189
190 rb_link_node(&aeb->u.rb, parent, p);
191 rb_insert_color(&aeb->u.rb, &av->root);
192}
193
194/**
195 * update_vol - inserts or updates a LEB which was found a pool.
196 * @ubi: the UBI device object
197 * @ai: attach info object
198 * @av: the volume this LEB belongs to
199 * @new_vh: the volume header derived from new_aeb
200 * @new_aeb: the AEB to be examined
201 *
202 * Returns 0 on success, < 0 indicates an internal error.
203 */
204static int update_vol(struct ubi_device *ubi, struct ubi_attach_info *ai,
205 struct ubi_ainf_volume *av, struct ubi_vid_hdr *new_vh,
206 struct ubi_ainf_peb *new_aeb)
207{
208 struct rb_node **p = &av->root.rb_node, *parent = NULL;
209 struct ubi_ainf_peb *aeb, *victim;
210 int cmp_res;
211
212 while (*p) {
213 parent = *p;
214 aeb = rb_entry(parent, struct ubi_ainf_peb, u.rb);
215
216 if (be32_to_cpu(new_vh->lnum) != aeb->lnum) {
217 if (be32_to_cpu(new_vh->lnum) < aeb->lnum)
218 p = &(*p)->rb_left;
219 else
220 p = &(*p)->rb_right;
221
222 continue;
223 }
224
225 /* This case can happen if the fastmap gets written
226 * because of a volume change (creation, deletion, ..).
227 * Then a PEB can be within the persistent EBA and the pool.
228 */
229 if (aeb->pnum == new_aeb->pnum) {
230 ubi_assert(aeb->lnum == new_aeb->lnum);
231 kmem_cache_free(ai->aeb_slab_cache, new_aeb);
232
233 return 0;
234 }
235
236 cmp_res = ubi_compare_lebs(ubi, aeb, new_aeb->pnum, new_vh);
237 if (cmp_res < 0)
238 return cmp_res;
239
240 /* new_aeb is newer */
241 if (cmp_res & 1) {
242 victim = kmem_cache_alloc(ai->aeb_slab_cache,
243 GFP_KERNEL);
244 if (!victim)
245 return -ENOMEM;
246
247 victim->ec = aeb->ec;
248 victim->pnum = aeb->pnum;
249 list_add_tail(&victim->u.list, &ai->erase);
250
251 if (av->highest_lnum == be32_to_cpu(new_vh->lnum))
252 av->last_data_size = \
253 be32_to_cpu(new_vh->data_size);
254
255 dbg_bld("vol %i: AEB %i's PEB %i is the newer",
256 av->vol_id, aeb->lnum, new_aeb->pnum);
257
258 aeb->ec = new_aeb->ec;
259 aeb->pnum = new_aeb->pnum;
260 aeb->copy_flag = new_vh->copy_flag;
261 aeb->scrub = new_aeb->scrub;
262 kmem_cache_free(ai->aeb_slab_cache, new_aeb);
263
264 /* new_aeb is older */
265 } else {
266 dbg_bld("vol %i: AEB %i's PEB %i is old, dropping it",
267 av->vol_id, aeb->lnum, new_aeb->pnum);
268 list_add_tail(&new_aeb->u.list, &ai->erase);
269 }
270
271 return 0;
272 }
273 /* This LEB is new, let's add it to the volume */
274
275 if (av->highest_lnum <= be32_to_cpu(new_vh->lnum)) {
276 av->highest_lnum = be32_to_cpu(new_vh->lnum);
277 av->last_data_size = be32_to_cpu(new_vh->data_size);
278 }
279
280 if (av->vol_type == UBI_STATIC_VOLUME)
281 av->used_ebs = be32_to_cpu(new_vh->used_ebs);
282
283 av->leb_count++;
284
285 rb_link_node(&new_aeb->u.rb, parent, p);
286 rb_insert_color(&new_aeb->u.rb, &av->root);
287
288 return 0;
289}
290
291/**
292 * process_pool_aeb - we found a non-empty PEB in a pool.
293 * @ubi: UBI device object
294 * @ai: attach info object
295 * @new_vh: the volume header derived from new_aeb
296 * @new_aeb: the AEB to be examined
297 *
298 * Returns 0 on success, < 0 indicates an internal error.
299 */
300static int process_pool_aeb(struct ubi_device *ubi, struct ubi_attach_info *ai,
301 struct ubi_vid_hdr *new_vh,
302 struct ubi_ainf_peb *new_aeb)
303{
304 struct ubi_ainf_volume *av, *tmp_av = NULL;
305 struct rb_node **p = &ai->volumes.rb_node, *parent = NULL;
306 int found = 0;
307
308 if (be32_to_cpu(new_vh->vol_id) == UBI_FM_SB_VOLUME_ID ||
309 be32_to_cpu(new_vh->vol_id) == UBI_FM_DATA_VOLUME_ID) {
310 kmem_cache_free(ai->aeb_slab_cache, new_aeb);
311
312 return 0;
313 }
314
315 /* Find the volume this SEB belongs to */
316 while (*p) {
317 parent = *p;
318 tmp_av = rb_entry(parent, struct ubi_ainf_volume, rb);
319
320 if (be32_to_cpu(new_vh->vol_id) > tmp_av->vol_id)
321 p = &(*p)->rb_left;
322 else if (be32_to_cpu(new_vh->vol_id) < tmp_av->vol_id)
323 p = &(*p)->rb_right;
324 else {
325 found = 1;
326 break;
327 }
328 }
329
330 if (found)
331 av = tmp_av;
332 else {
32608703 333 ubi_err(ubi, "orphaned volume in fastmap pool!");
1bf1890e 334 kmem_cache_free(ai->aeb_slab_cache, new_aeb);
dbb7d2a8
RW		 335 return UBI_BAD_FASTMAP;
336 }
337
338 ubi_assert(be32_to_cpu(new_vh->vol_id) == av->vol_id);
339
340 return update_vol(ubi, ai, av, new_vh, new_aeb);
341}
342
343/**
344 * unmap_peb - unmap a PEB.
345 * If fastmap detects a free PEB in the pool it has to check whether
346 * this PEB has been unmapped after writing the fastmap.
347 *
348 * @ai: UBI attach info object
349 * @pnum: The PEB to be unmapped
350 */
351static void unmap_peb(struct ubi_attach_info *ai, int pnum)
352{
353 struct ubi_ainf_volume *av;
354 struct rb_node *node, *node2;
355 struct ubi_ainf_peb *aeb;
356
357 for (node = rb_first(&ai->volumes); node; node = rb_next(node)) {
358 av = rb_entry(node, struct ubi_ainf_volume, rb);
359
360 for (node2 = rb_first(&av->root); node2;
361 node2 = rb_next(node2)) {
362 aeb = rb_entry(node2, struct ubi_ainf_peb, u.rb);
363 if (aeb->pnum == pnum) {
364 rb_erase(&aeb->u.rb, &av->root);
365 kmem_cache_free(ai->aeb_slab_cache, aeb);
366 return;
367 }
368 }
369 }
370}
371
372/**
373 * scan_pool - scans a pool for changed (no longer empty PEBs).
374 * @ubi: UBI device object
375 * @ai: attach info object
376 * @pebs: an array of all PEB numbers in the to be scanned pool
377 * @pool_size: size of the pool (number of entries in @pebs)
378 * @max_sqnum: pointer to the maximal sequence number
dbb7d2a8
RW		 379 * @free: list of PEBs which are most likely free (and go into @ai->free)
380 *
381 * Returns 0 on success, if the pool is unusable UBI_BAD_FASTMAP is returned.
382 * < 0 indicates an internal error.
383 */
384static int scan_pool(struct ubi_device *ubi, struct ubi_attach_info *ai,
385 int *pebs, int pool_size, unsigned long long *max_sqnum,
d141a8ef 386 struct list_head *free)
dbb7d2a8
RW		 387{
388 struct ubi_vid_hdr *vh;
389 struct ubi_ec_hdr *ech;
d141a8ef
RW		 390 struct ubi_ainf_peb *new_aeb;
391 int i, pnum, err, ret = 0;
dbb7d2a8
RW		 392
393 ech = kzalloc(ubi->ec_hdr_alsize, GFP_KERNEL);
394 if (!ech)
395 return -ENOMEM;
396
397 vh = ubi_zalloc_vid_hdr(ubi, GFP_KERNEL);
398 if (!vh) {
399 kfree(ech);
400 return -ENOMEM;
401 }
402
403 dbg_bld("scanning fastmap pool: size = %i", pool_size);
404
405 /*
406 * Now scan all PEBs in the pool to find changes which have been made
407 * after the creation of the fastmap
408 */
409 for (i = 0; i < pool_size; i++) {
410 int scrub = 0;
c22301ad 411 int image_seq;
dbb7d2a8
RW		 412
413 pnum = be32_to_cpu(pebs[i]);
414
415 if (ubi_io_is_bad(ubi, pnum)) {
32608703 416 ubi_err(ubi, "bad PEB in fastmap pool!");
dbb7d2a8
RW		 417 ret = UBI_BAD_FASTMAP;
418 goto out;
419 }
420
421 err = ubi_io_read_ec_hdr(ubi, pnum, ech, 0);
422 if (err && err != UBI_IO_BITFLIPS) {
32608703 423 ubi_err(ubi, "unable to read EC header! PEB:%i err:%i",
dbb7d2a8
RW		 424 pnum, err);
425 ret = err > 0 ? UBI_BAD_FASTMAP : err;
426 goto out;
44305ebd 427 } else if (err == UBI_IO_BITFLIPS)
dbb7d2a8
RW		 428 scrub = 1;
429
c22301ad
RG		 430 /*
431 * Older UBI implementations have image_seq set to zero, so
432 * we shouldn't fail if image_seq == 0.
433 */
434 image_seq = be32_to_cpu(ech->image_seq);
435
436 if (image_seq && (image_seq != ubi->image_seq)) {
32608703 437 ubi_err(ubi, "bad image seq: 0x%x, expected: 0x%x",
dbb7d2a8 438 be32_to_cpu(ech->image_seq), ubi->image_seq);
f240dca8 439 ret = UBI_BAD_FASTMAP;
dbb7d2a8
RW		 440 goto out;
441 }
442
443 err = ubi_io_read_vid_hdr(ubi, pnum, vh, 0);
444 if (err == UBI_IO_FF || err == UBI_IO_FF_BITFLIPS) {
445 unsigned long long ec = be64_to_cpu(ech->ec);
446 unmap_peb(ai, pnum);
447 dbg_bld("Adding PEB to free: %i", pnum);
448 if (err == UBI_IO_FF_BITFLIPS)
449 add_aeb(ai, free, pnum, ec, 1);
450 else
451 add_aeb(ai, free, pnum, ec, 0);
452 continue;
453 } else if (err == 0 || err == UBI_IO_BITFLIPS) {
454 dbg_bld("Found non empty PEB:%i in pool", pnum);
455
456 if (err == UBI_IO_BITFLIPS)
457 scrub = 1;
458
dbb7d2a8
RW		 459 new_aeb = kmem_cache_alloc(ai->aeb_slab_cache,
460 GFP_KERNEL);
461 if (!new_aeb) {
462 ret = -ENOMEM;
463 goto out;
464 }
465
466 new_aeb->ec = be64_to_cpu(ech->ec);
467 new_aeb->pnum = pnum;
468 new_aeb->lnum = be32_to_cpu(vh->lnum);
469 new_aeb->sqnum = be64_to_cpu(vh->sqnum);
470 new_aeb->copy_flag = vh->copy_flag;
471 new_aeb->scrub = scrub;
472
473 if (*max_sqnum < new_aeb->sqnum)
474 *max_sqnum = new_aeb->sqnum;
475
476 err = process_pool_aeb(ubi, ai, vh, new_aeb);
477 if (err) {
478 ret = err > 0 ? UBI_BAD_FASTMAP : err;
479 goto out;
480 }
481 } else {
482 /* We are paranoid and fall back to scanning mode */
32608703 483 ubi_err(ubi, "fastmap pool PEBs contains damaged PEBs!");
dbb7d2a8
RW		 484 ret = err > 0 ? UBI_BAD_FASTMAP : err;
485 goto out;
486 }
487
488 }
489
490out:
491 ubi_free_vid_hdr(ubi, vh);
492 kfree(ech);
493 return ret;
494}
495
496/**
497 * count_fastmap_pebs - Counts the PEBs found by fastmap.
498 * @ai: The UBI attach info object
499 */
500static int count_fastmap_pebs(struct ubi_attach_info *ai)
501{
502 struct ubi_ainf_peb *aeb;
503 struct ubi_ainf_volume *av;
504 struct rb_node *rb1, *rb2;
505 int n = 0;
506
507 list_for_each_entry(aeb, &ai->erase, u.list)
508 n++;
509
510 list_for_each_entry(aeb, &ai->free, u.list)
511 n++;
512
513 ubi_rb_for_each_entry(rb1, av, &ai->volumes, rb)
514 ubi_rb_for_each_entry(rb2, aeb, &av->root, u.rb)
515 n++;
516
517 return n;
518}
519
520/**
521 * ubi_attach_fastmap - creates ubi_attach_info from a fastmap.
522 * @ubi: UBI device object
523 * @ai: UBI attach info object
524 * @fm: the fastmap to be attached
525 *
526 * Returns 0 on success, UBI_BAD_FASTMAP if the found fastmap was unusable.
527 * < 0 indicates an internal error.
528 */
529static int ubi_attach_fastmap(struct ubi_device *ubi,
530 struct ubi_attach_info *ai,
531 struct ubi_fastmap_layout *fm)
532{
d141a8ef 533 struct list_head used, free;
dbb7d2a8
RW		 534 struct ubi_ainf_volume *av;
535 struct ubi_ainf_peb *aeb, *tmp_aeb, *_tmp_aeb;
dbb7d2a8
RW		 536 struct ubi_fm_sb *fmsb;
537 struct ubi_fm_hdr *fmhdr;
538 struct ubi_fm_scan_pool *fmpl1, *fmpl2;
539 struct ubi_fm_ec *fmec;
540 struct ubi_fm_volhdr *fmvhdr;
541 struct ubi_fm_eba *fm_eba;
542 int ret, i, j, pool_size, wl_pool_size;
543 size_t fm_pos = 0, fm_size = ubi->fm_size;
544 unsigned long long max_sqnum = 0;
545 void *fm_raw = ubi->fm_buf;
546
547 INIT_LIST_HEAD(&used);
548 INIT_LIST_HEAD(&free);
dbb7d2a8
RW		 549 ai->min_ec = UBI_MAX_ERASECOUNTER;
550
dbb7d2a8
RW		 551 fmsb = (struct ubi_fm_sb *)(fm_raw);
552 ai->max_sqnum = fmsb->sqnum;
553 fm_pos += sizeof(struct ubi_fm_sb);
554 if (fm_pos >= fm_size)
555 goto fail_bad;
556
557 fmhdr = (struct ubi_fm_hdr *)(fm_raw + fm_pos);
558 fm_pos += sizeof(*fmhdr);
559 if (fm_pos >= fm_size)
560 goto fail_bad;
561
562 if (be32_to_cpu(fmhdr->magic) != UBI_FM_HDR_MAGIC) {
32608703 563 ubi_err(ubi, "bad fastmap header magic: 0x%x, expected: 0x%x",
dbb7d2a8
RW		 564 be32_to_cpu(fmhdr->magic), UBI_FM_HDR_MAGIC);
565 goto fail_bad;
566 }
567
568 fmpl1 = (struct ubi_fm_scan_pool *)(fm_raw + fm_pos);
569 fm_pos += sizeof(*fmpl1);
570 if (fm_pos >= fm_size)
571 goto fail_bad;
572 if (be32_to_cpu(fmpl1->magic) != UBI_FM_POOL_MAGIC) {
32608703 573 ubi_err(ubi, "bad fastmap pool magic: 0x%x, expected: 0x%x",
dbb7d2a8
RW		 574 be32_to_cpu(fmpl1->magic), UBI_FM_POOL_MAGIC);
575 goto fail_bad;
576 }
577
578 fmpl2 = (struct ubi_fm_scan_pool *)(fm_raw + fm_pos);
579 fm_pos += sizeof(*fmpl2);
580 if (fm_pos >= fm_size)
581 goto fail_bad;
582 if (be32_to_cpu(fmpl2->magic) != UBI_FM_POOL_MAGIC) {
32608703 583 ubi_err(ubi, "bad fastmap pool magic: 0x%x, expected: 0x%x",
dbb7d2a8
RW		 584 be32_to_cpu(fmpl2->magic), UBI_FM_POOL_MAGIC);
585 goto fail_bad;
586 }
587
588 pool_size = be16_to_cpu(fmpl1->size);
589 wl_pool_size = be16_to_cpu(fmpl2->size);
590 fm->max_pool_size = be16_to_cpu(fmpl1->max_size);
591 fm->max_wl_pool_size = be16_to_cpu(fmpl2->max_size);
592
593 if (pool_size > UBI_FM_MAX_POOL_SIZE || pool_size < 0) {
32608703 594 ubi_err(ubi, "bad pool size: %i", pool_size);
dbb7d2a8
RW		 595 goto fail_bad;
596 }
597
598 if (wl_pool_size > UBI_FM_MAX_POOL_SIZE || wl_pool_size < 0) {
32608703 599 ubi_err(ubi, "bad WL pool size: %i", wl_pool_size);
dbb7d2a8
RW		 600 goto fail_bad;
601 }
602
603
604 if (fm->max_pool_size > UBI_FM_MAX_POOL_SIZE ||
605 fm->max_pool_size < 0) {
32608703 606 ubi_err(ubi, "bad maximal pool size: %i", fm->max_pool_size);
dbb7d2a8
RW		 607 goto fail_bad;
608 }
609
610 if (fm->max_wl_pool_size > UBI_FM_MAX_POOL_SIZE ||
611 fm->max_wl_pool_size < 0) {
32608703
TB		 612 ubi_err(ubi, "bad maximal WL pool size: %i",
613 fm->max_wl_pool_size);
dbb7d2a8
RW		 614 goto fail_bad;
615 }
616
617 /* read EC values from free list */
618 for (i = 0; i < be32_to_cpu(fmhdr->free_peb_count); i++) {
619 fmec = (struct ubi_fm_ec *)(fm_raw + fm_pos);
620 fm_pos += sizeof(*fmec);
621 if (fm_pos >= fm_size)
622 goto fail_bad;
623
624 add_aeb(ai, &ai->free, be32_to_cpu(fmec->pnum),
625 be32_to_cpu(fmec->ec), 0);
626 }
627
628 /* read EC values from used list */
629 for (i = 0; i < be32_to_cpu(fmhdr->used_peb_count); i++) {
630 fmec = (struct ubi_fm_ec *)(fm_raw + fm_pos);
631 fm_pos += sizeof(*fmec);
632 if (fm_pos >= fm_size)
633 goto fail_bad;
634
635 add_aeb(ai, &used, be32_to_cpu(fmec->pnum),
636 be32_to_cpu(fmec->ec), 0);
637 }
638
639 /* read EC values from scrub list */
640 for (i = 0; i < be32_to_cpu(fmhdr->scrub_peb_count); i++) {
641 fmec = (struct ubi_fm_ec *)(fm_raw + fm_pos);
642 fm_pos += sizeof(*fmec);
643 if (fm_pos >= fm_size)
644 goto fail_bad;
645
646 add_aeb(ai, &used, be32_to_cpu(fmec->pnum),
647 be32_to_cpu(fmec->ec), 1);
648 }
649
650 /* read EC values from erase list */
651 for (i = 0; i < be32_to_cpu(fmhdr->erase_peb_count); i++) {
652 fmec = (struct ubi_fm_ec *)(fm_raw + fm_pos);
653 fm_pos += sizeof(*fmec);
654 if (fm_pos >= fm_size)
655 goto fail_bad;
656
657 add_aeb(ai, &ai->erase, be32_to_cpu(fmec->pnum),
658 be32_to_cpu(fmec->ec), 1);
659 }
660
661 ai->mean_ec = div_u64(ai->ec_sum, ai->ec_count);
662 ai->bad_peb_count = be32_to_cpu(fmhdr->bad_peb_count);
663
664 /* Iterate over all volumes and read their EBA table */
665 for (i = 0; i < be32_to_cpu(fmhdr->vol_count); i++) {
666 fmvhdr = (struct ubi_fm_volhdr *)(fm_raw + fm_pos);
667 fm_pos += sizeof(*fmvhdr);
668 if (fm_pos >= fm_size)
669 goto fail_bad;
670
671 if (be32_to_cpu(fmvhdr->magic) != UBI_FM_VHDR_MAGIC) {
32608703 672 ubi_err(ubi, "bad fastmap vol header magic: 0x%x, expected: 0x%x",
dbb7d2a8
RW		 673 be32_to_cpu(fmvhdr->magic), UBI_FM_VHDR_MAGIC);
674 goto fail_bad;
675 }
676
677 av = add_vol(ai, be32_to_cpu(fmvhdr->vol_id),
678 be32_to_cpu(fmvhdr->used_ebs),
679 be32_to_cpu(fmvhdr->data_pad),
680 fmvhdr->vol_type,
681 be32_to_cpu(fmvhdr->last_eb_bytes));
682
683 if (!av)
684 goto fail_bad;
685
686 ai->vols_found++;
687 if (ai->highest_vol_id < be32_to_cpu(fmvhdr->vol_id))
688 ai->highest_vol_id = be32_to_cpu(fmvhdr->vol_id);
689
690 fm_eba = (struct ubi_fm_eba *)(fm_raw + fm_pos);
691 fm_pos += sizeof(*fm_eba);
692 fm_pos += (sizeof(__be32) * be32_to_cpu(fm_eba->reserved_pebs));
693 if (fm_pos >= fm_size)
694 goto fail_bad;
695
696 if (be32_to_cpu(fm_eba->magic) != UBI_FM_EBA_MAGIC) {
32608703 697 ubi_err(ubi, "bad fastmap EBA header magic: 0x%x, expected: 0x%x",
dbb7d2a8
RW		 698 be32_to_cpu(fm_eba->magic), UBI_FM_EBA_MAGIC);
699 goto fail_bad;
700 }
701
702 for (j = 0; j < be32_to_cpu(fm_eba->reserved_pebs); j++) {
703 int pnum = be32_to_cpu(fm_eba->pnum[j]);
704
705 if ((int)be32_to_cpu(fm_eba->pnum[j]) < 0)
706 continue;
707
708 aeb = NULL;
709 list_for_each_entry(tmp_aeb, &used, u.list) {
584d4623 710 if (tmp_aeb->pnum == pnum) {
dbb7d2a8 711 aeb = tmp_aeb;
584d4623
BP		 712 break;
713 }
dbb7d2a8
RW		 714 }
715
dbb7d2a8 716 if (!aeb) {
d141a8ef
RW		 717 ubi_err(ubi, "PEB %i is in EBA but not in used list", pnum);
718 goto fail_bad;
dbb7d2a8
RW		 719 }
720
721 aeb->lnum = j;
722
723 if (av->highest_lnum <= aeb->lnum)
724 av->highest_lnum = aeb->lnum;
725
726 assign_aeb_to_av(ai, aeb, av);
727
728 dbg_bld("inserting PEB:%i (LEB %i) to vol %i",
729 aeb->pnum, aeb->lnum, av->vol_id);
730 }
dbb7d2a8
RW		 731 }
732
d141a8ef 733 ret = scan_pool(ubi, ai, fmpl1->pebs, pool_size, &max_sqnum, &free);
dbb7d2a8
RW		 734 if (ret)
735 goto fail;
736
d141a8ef 737 ret = scan_pool(ubi, ai, fmpl2->pebs, wl_pool_size, &max_sqnum, &free);
dbb7d2a8
RW		 738 if (ret)
739 goto fail;
740
741 if (max_sqnum > ai->max_sqnum)
742 ai->max_sqnum = max_sqnum;
743
6a059abd
WY		 744 list_for_each_entry_safe(tmp_aeb, _tmp_aeb, &free, u.list)
745 list_move_tail(&tmp_aeb->u.list, &ai->free);
dbb7d2a8 746
a83832a7
RW		 747 list_for_each_entry_safe(tmp_aeb, _tmp_aeb, &used, u.list)
748 list_move_tail(&tmp_aeb->u.list, &ai->erase);
749
ae0d1469
RW		 750 ubi_assert(list_empty(&free));
751
dbb7d2a8
RW		 752 /*
753 * If fastmap is leaking PEBs (must not happen), raise a
754 * fat warning and fall back to scanning mode.
755 * We do this here because in ubi_wl_init() it's too late
756 * and we cannot fall back to scanning.
757 */
758 if (WARN_ON(count_fastmap_pebs(ai) != ubi->peb_count -
759 ai->bad_peb_count - fm->used_blocks))
760 goto fail_bad;
761
762 return 0;
763
764fail_bad:
765 ret = UBI_BAD_FASTMAP;
766fail:
fe24c6e5 767 list_for_each_entry_safe(tmp_aeb, _tmp_aeb, &used, u.list) {
fe24c6e5 768 list_del(&tmp_aeb->u.list);
5547fec7 769 kmem_cache_free(ai->aeb_slab_cache, tmp_aeb);
fe24c6e5 770 }
fe24c6e5 771 list_for_each_entry_safe(tmp_aeb, _tmp_aeb, &free, u.list) {
fe24c6e5 772 list_del(&tmp_aeb->u.list);
5547fec7 773 kmem_cache_free(ai->aeb_slab_cache, tmp_aeb);
fe24c6e5
RW		 774 }
775
dbb7d2a8
RW		 776 return ret;
777}
778
779/**
780 * ubi_scan_fastmap - scan the fastmap.
781 * @ubi: UBI device object
782 * @ai: UBI attach info to be filled
783 * @fm_anchor: The fastmap starts at this PEB
784 *
785 * Returns 0 on success, UBI_NO_FASTMAP if no fastmap was found,
786 * UBI_BAD_FASTMAP if one was found but is not usable.
787 * < 0 indicates an internal error.
788 */
789int ubi_scan_fastmap(struct ubi_device *ubi, struct ubi_attach_info *ai,
790 int fm_anchor)
791{
792 struct ubi_fm_sb *fmsb, *fmsb2;
793 struct ubi_vid_hdr *vh;
794 struct ubi_ec_hdr *ech;
795 struct ubi_fastmap_layout *fm;
796 int i, used_blocks, pnum, ret = 0;
797 size_t fm_size;
798 __be32 crc, tmp_crc;
799 unsigned long long sqnum = 0;
800
801 mutex_lock(&ubi->fm_mutex);
802 memset(ubi->fm_buf, 0, ubi->fm_size);
803
804 fmsb = kmalloc(sizeof(*fmsb), GFP_KERNEL);
805 if (!fmsb) {
806 ret = -ENOMEM;
807 goto out;
808 }
809
810 fm = kzalloc(sizeof(*fm), GFP_KERNEL);
811 if (!fm) {
812 ret = -ENOMEM;
813 kfree(fmsb);
814 goto out;
815 }
816
817 ret = ubi_io_read(ubi, fmsb, fm_anchor, ubi->leb_start, sizeof(*fmsb));
818 if (ret && ret != UBI_IO_BITFLIPS)
819 goto free_fm_sb;
820 else if (ret == UBI_IO_BITFLIPS)
821 fm->to_be_tortured[0] = 1;
822
823 if (be32_to_cpu(fmsb->magic) != UBI_FM_SB_MAGIC) {
32608703 824 ubi_err(ubi, "bad super block magic: 0x%x, expected: 0x%x",
dbb7d2a8
RW		 825 be32_to_cpu(fmsb->magic), UBI_FM_SB_MAGIC);
826 ret = UBI_BAD_FASTMAP;
827 goto free_fm_sb;
828 }
829
830 if (fmsb->version != UBI_FM_FMT_VERSION) {
32608703 831 ubi_err(ubi, "bad fastmap version: %i, expected: %i",
dbb7d2a8
RW		 832 fmsb->version, UBI_FM_FMT_VERSION);
833 ret = UBI_BAD_FASTMAP;
834 goto free_fm_sb;
835 }
836
837 used_blocks = be32_to_cpu(fmsb->used_blocks);
838 if (used_blocks > UBI_FM_MAX_BLOCKS || used_blocks < 1) {
32608703
TB		 839 ubi_err(ubi, "number of fastmap blocks is invalid: %i",
840 used_blocks);
dbb7d2a8
RW		 841 ret = UBI_BAD_FASTMAP;
842 goto free_fm_sb;
843 }
844
845 fm_size = ubi->leb_size * used_blocks;
846 if (fm_size != ubi->fm_size) {
32608703
TB		 847 ubi_err(ubi, "bad fastmap size: %zi, expected: %zi",
848 fm_size, ubi->fm_size);
dbb7d2a8
RW		 849 ret = UBI_BAD_FASTMAP;
850 goto free_fm_sb;
851 }
852
853 ech = kzalloc(ubi->ec_hdr_alsize, GFP_KERNEL);
854 if (!ech) {
855 ret = -ENOMEM;
856 goto free_fm_sb;
857 }
858
859 vh = ubi_zalloc_vid_hdr(ubi, GFP_KERNEL);
860 if (!vh) {
861 ret = -ENOMEM;
862 goto free_hdr;
863 }
864
865 for (i = 0; i < used_blocks; i++) {
c22301ad
RG		 866 int image_seq;
867
dbb7d2a8
RW		 868 pnum = be32_to_cpu(fmsb->block_loc[i]);
869
870 if (ubi_io_is_bad(ubi, pnum)) {
871 ret = UBI_BAD_FASTMAP;
872 goto free_hdr;
873 }
874
875 ret = ubi_io_read_ec_hdr(ubi, pnum, ech, 0);
876 if (ret && ret != UBI_IO_BITFLIPS) {
32608703 877 ubi_err(ubi, "unable to read fastmap block# %i EC (PEB: %i)",
dbb7d2a8
RW		 878 i, pnum);
879 if (ret > 0)
880 ret = UBI_BAD_FASTMAP;
881 goto free_hdr;
882 } else if (ret == UBI_IO_BITFLIPS)
883 fm->to_be_tortured[i] = 1;
884
c22301ad 885 image_seq = be32_to_cpu(ech->image_seq);
dbb7d2a8 886 if (!ubi->image_seq)
c22301ad 887 ubi->image_seq = image_seq;
dbb7d2a8 888
c22301ad
RG		 889 /*
890 * Older UBI implementations have image_seq set to zero, so
891 * we shouldn't fail if image_seq == 0.
892 */
893 if (image_seq && (image_seq != ubi->image_seq)) {
32608703 894 ubi_err(ubi, "wrong image seq:%d instead of %d",
c22301ad 895 be32_to_cpu(ech->image_seq), ubi->image_seq);
dbb7d2a8
RW		 896 ret = UBI_BAD_FASTMAP;
897 goto free_hdr;
898 }
899
900 ret = ubi_io_read_vid_hdr(ubi, pnum, vh, 0);
901 if (ret && ret != UBI_IO_BITFLIPS) {
32608703 902 ubi_err(ubi, "unable to read fastmap block# %i (PEB: %i)",
dbb7d2a8
RW		 903 i, pnum);
904 goto free_hdr;
905 }
906
907 if (i == 0) {
908 if (be32_to_cpu(vh->vol_id) != UBI_FM_SB_VOLUME_ID) {
32608703 909 ubi_err(ubi, "bad fastmap anchor vol_id: 0x%x, expected: 0x%x",
dbb7d2a8
RW		 910 be32_to_cpu(vh->vol_id),
911 UBI_FM_SB_VOLUME_ID);
912 ret = UBI_BAD_FASTMAP;
913 goto free_hdr;
914 }
915 } else {
916 if (be32_to_cpu(vh->vol_id) != UBI_FM_DATA_VOLUME_ID) {
32608703 917 ubi_err(ubi, "bad fastmap data vol_id: 0x%x, expected: 0x%x",
dbb7d2a8
RW		 918 be32_to_cpu(vh->vol_id),
919 UBI_FM_DATA_VOLUME_ID);
920 ret = UBI_BAD_FASTMAP;
921 goto free_hdr;
922 }
923 }
924
925 if (sqnum < be64_to_cpu(vh->sqnum))
926 sqnum = be64_to_cpu(vh->sqnum);
927
928 ret = ubi_io_read(ubi, ubi->fm_buf + (ubi->leb_size * i), pnum,
929 ubi->leb_start, ubi->leb_size);
930 if (ret && ret != UBI_IO_BITFLIPS) {
32608703 931 ubi_err(ubi, "unable to read fastmap block# %i (PEB: %i, "
dbb7d2a8
RW		 932 "err: %i)", i, pnum, ret);
933 goto free_hdr;
934 }
935 }
936
937 kfree(fmsb);
938 fmsb = NULL;
939
940 fmsb2 = (struct ubi_fm_sb *)(ubi->fm_buf);
941 tmp_crc = be32_to_cpu(fmsb2->data_crc);
942 fmsb2->data_crc = 0;
943 crc = crc32(UBI_CRC32_INIT, ubi->fm_buf, fm_size);
944 if (crc != tmp_crc) {
32608703
TB		 945 ubi_err(ubi, "fastmap data CRC is invalid");
946 ubi_err(ubi, "CRC should be: 0x%x, calc: 0x%x",
947 tmp_crc, crc);
dbb7d2a8
RW		 948 ret = UBI_BAD_FASTMAP;
949 goto free_hdr;
950 }
951
952 fmsb2->sqnum = sqnum;
953
954 fm->used_blocks = used_blocks;
955
956 ret = ubi_attach_fastmap(ubi, ai, fm);
957 if (ret) {
958 if (ret > 0)
959 ret = UBI_BAD_FASTMAP;
960 goto free_hdr;
961 }
962
963 for (i = 0; i < used_blocks; i++) {
964 struct ubi_wl_entry *e;
965
966 e = kmem_cache_alloc(ubi_wl_entry_slab, GFP_KERNEL);
967 if (!e) {
968 while (i--)
969 kfree(fm->e[i]);
970
971 ret = -ENOMEM;
972 goto free_hdr;
973 }
974
975 e->pnum = be32_to_cpu(fmsb2->block_loc[i]);
976 e->ec = be32_to_cpu(fmsb2->block_ec[i]);
977 fm->e[i] = e;
978 }
979
980 ubi->fm = fm;
981 ubi->fm_pool.max_size = ubi->fm->max_pool_size;
982 ubi->fm_wl_pool.max_size = ubi->fm->max_wl_pool_size;
32608703
TB		 983 ubi_msg(ubi, "attached by fastmap");
984 ubi_msg(ubi, "fastmap pool size: %d", ubi->fm_pool.max_size);
985 ubi_msg(ubi, "fastmap WL pool size: %d",
986 ubi->fm_wl_pool.max_size);
dbb7d2a8
RW		 987 ubi->fm_disabled = 0;
988
989 ubi_free_vid_hdr(ubi, vh);
990 kfree(ech);
991out:
992 mutex_unlock(&ubi->fm_mutex);
993 if (ret == UBI_BAD_FASTMAP)
32608703 994 ubi_err(ubi, "Attach by fastmap failed, doing a full scan!");
dbb7d2a8
RW		 995 return ret;
996
997free_hdr:
998 ubi_free_vid_hdr(ubi, vh);
999 kfree(ech);
1000free_fm_sb:
1001 kfree(fmsb);
1002 kfree(fm);
1003 goto out;
1004}
1005
1006/**
1007 * ubi_write_fastmap - writes a fastmap.
1008 * @ubi: UBI device object
1009 * @new_fm: the to be written fastmap
1010 *
1011 * Returns 0 on success, < 0 indicates an internal error.
1012 */
1013static int ubi_write_fastmap(struct ubi_device *ubi,
1014 struct ubi_fastmap_layout *new_fm)
1015{
1016 size_t fm_pos = 0;
1017 void *fm_raw;
1018 struct ubi_fm_sb *fmsb;
1019 struct ubi_fm_hdr *fmh;
1020 struct ubi_fm_scan_pool *fmpl1, *fmpl2;
1021 struct ubi_fm_ec *fec;
1022 struct ubi_fm_volhdr *fvh;
1023 struct ubi_fm_eba *feba;
1024 struct rb_node *node;
1025 struct ubi_wl_entry *wl_e;
1026 struct ubi_volume *vol;
1027 struct ubi_vid_hdr *avhdr, *dvhdr;
1028 struct ubi_work *ubi_wrk;
1029 int ret, i, j, free_peb_count, used_peb_count, vol_count;
1030 int scrub_peb_count, erase_peb_count;
1031
1032 fm_raw = ubi->fm_buf;
1033 memset(ubi->fm_buf, 0, ubi->fm_size);
1034
1035 avhdr = new_fm_vhdr(ubi, UBI_FM_SB_VOLUME_ID);
1036 if (!avhdr) {
1037 ret = -ENOMEM;
1038 goto out;
1039 }
1040
1041 dvhdr = new_fm_vhdr(ubi, UBI_FM_DATA_VOLUME_ID);
1042 if (!dvhdr) {
1043 ret = -ENOMEM;
1044 goto out_kfree;
1045 }
1046
1047 spin_lock(&ubi->volumes_lock);
1048 spin_lock(&ubi->wl_lock);
1049
1050 fmsb = (struct ubi_fm_sb *)fm_raw;
1051 fm_pos += sizeof(*fmsb);
1052 ubi_assert(fm_pos <= ubi->fm_size);
1053
1054 fmh = (struct ubi_fm_hdr *)(fm_raw + fm_pos);
1055 fm_pos += sizeof(*fmh);
1056 ubi_assert(fm_pos <= ubi->fm_size);
1057
1058 fmsb->magic = cpu_to_be32(UBI_FM_SB_MAGIC);
1059 fmsb->version = UBI_FM_FMT_VERSION;
1060 fmsb->used_blocks = cpu_to_be32(new_fm->used_blocks);
1061 /* the max sqnum will be filled in while *reading* the fastmap */
1062 fmsb->sqnum = 0;
1063
1064 fmh->magic = cpu_to_be32(UBI_FM_HDR_MAGIC);
1065 free_peb_count = 0;
1066 used_peb_count = 0;
1067 scrub_peb_count = 0;
1068 erase_peb_count = 0;
1069 vol_count = 0;
1070
1071 fmpl1 = (struct ubi_fm_scan_pool *)(fm_raw + fm_pos);
1072 fm_pos += sizeof(*fmpl1);
1073 fmpl1->magic = cpu_to_be32(UBI_FM_POOL_MAGIC);
1074 fmpl1->size = cpu_to_be16(ubi->fm_pool.size);
1075 fmpl1->max_size = cpu_to_be16(ubi->fm_pool.max_size);
1076
1077 for (i = 0; i < ubi->fm_pool.size; i++)
1078 fmpl1->pebs[i] = cpu_to_be32(ubi->fm_pool.pebs[i]);
1079
1080 fmpl2 = (struct ubi_fm_scan_pool *)(fm_raw + fm_pos);
1081 fm_pos += sizeof(*fmpl2);
1082 fmpl2->magic = cpu_to_be32(UBI_FM_POOL_MAGIC);
1083 fmpl2->size = cpu_to_be16(ubi->fm_wl_pool.size);
1084 fmpl2->max_size = cpu_to_be16(ubi->fm_wl_pool.max_size);
1085
1086 for (i = 0; i < ubi->fm_wl_pool.size; i++)
1087 fmpl2->pebs[i] = cpu_to_be32(ubi->fm_wl_pool.pebs[i]);
1088
1089 for (node = rb_first(&ubi->free); node; node = rb_next(node)) {
1090 wl_e = rb_entry(node, struct ubi_wl_entry, u.rb);
1091 fec = (struct ubi_fm_ec *)(fm_raw + fm_pos);
1092
1093 fec->pnum = cpu_to_be32(wl_e->pnum);
1094 fec->ec = cpu_to_be32(wl_e->ec);
1095
1096 free_peb_count++;
1097 fm_pos += sizeof(*fec);
1098 ubi_assert(fm_pos <= ubi->fm_size);
1099 }
1100 fmh->free_peb_count = cpu_to_be32(free_peb_count);
1101
1102 for (node = rb_first(&ubi->used); node; node = rb_next(node)) {
1103 wl_e = rb_entry(node, struct ubi_wl_entry, u.rb);
1104 fec = (struct ubi_fm_ec *)(fm_raw + fm_pos);
1105
1106 fec->pnum = cpu_to_be32(wl_e->pnum);
1107 fec->ec = cpu_to_be32(wl_e->ec);
1108
1109 used_peb_count++;
1110 fm_pos += sizeof(*fec);
1111 ubi_assert(fm_pos <= ubi->fm_size);
1112 }
4f5e3b6f
RW		 1113
1114 for (i = 0; i < UBI_PROT_QUEUE_LEN; i++) {
1115 list_for_each_entry(wl_e, &ubi->pq[i], u.list) {
1116 fec = (struct ubi_fm_ec *)(fm_raw + fm_pos);
1117
1118 fec->pnum = cpu_to_be32(wl_e->pnum);
1119 fec->ec = cpu_to_be32(wl_e->ec);
1120
1121 used_peb_count++;
1122 fm_pos += sizeof(*fec);
1123 ubi_assert(fm_pos <= ubi->fm_size);
1124 }
1125 }
dbb7d2a8
RW		 1126 fmh->used_peb_count = cpu_to_be32(used_peb_count);
1127
1128 for (node = rb_first(&ubi->scrub); node; node = rb_next(node)) {
1129 wl_e = rb_entry(node, struct ubi_wl_entry, u.rb);
1130 fec = (struct ubi_fm_ec *)(fm_raw + fm_pos);
1131
1132 fec->pnum = cpu_to_be32(wl_e->pnum);
1133 fec->ec = cpu_to_be32(wl_e->ec);
1134
1135 scrub_peb_count++;
1136 fm_pos += sizeof(*fec);
1137 ubi_assert(fm_pos <= ubi->fm_size);
1138 }
1139 fmh->scrub_peb_count = cpu_to_be32(scrub_peb_count);
1140
1141
1142 list_for_each_entry(ubi_wrk, &ubi->works, list) {
1143 if (ubi_is_erase_work(ubi_wrk)) {
1144 wl_e = ubi_wrk->e;
1145 ubi_assert(wl_e);
1146
1147 fec = (struct ubi_fm_ec *)(fm_raw + fm_pos);
1148
1149 fec->pnum = cpu_to_be32(wl_e->pnum);
1150 fec->ec = cpu_to_be32(wl_e->ec);
1151
1152 erase_peb_count++;
1153 fm_pos += sizeof(*fec);
1154 ubi_assert(fm_pos <= ubi->fm_size);
1155 }
1156 }
1157 fmh->erase_peb_count = cpu_to_be32(erase_peb_count);
1158
1159 for (i = 0; i < UBI_MAX_VOLUMES + UBI_INT_VOL_COUNT; i++) {
1160 vol = ubi->volumes[i];
1161
1162 if (!vol)
1163 continue;
1164
1165 vol_count++;
1166
1167 fvh = (struct ubi_fm_volhdr *)(fm_raw + fm_pos);
1168 fm_pos += sizeof(*fvh);
1169 ubi_assert(fm_pos <= ubi->fm_size);
1170
1171 fvh->magic = cpu_to_be32(UBI_FM_VHDR_MAGIC);
1172 fvh->vol_id = cpu_to_be32(vol->vol_id);
1173 fvh->vol_type = vol->vol_type;
1174 fvh->used_ebs = cpu_to_be32(vol->used_ebs);
1175 fvh->data_pad = cpu_to_be32(vol->data_pad);
1176 fvh->last_eb_bytes = cpu_to_be32(vol->last_eb_bytes);
1177
1178 ubi_assert(vol->vol_type == UBI_DYNAMIC_VOLUME ||
1179 vol->vol_type == UBI_STATIC_VOLUME);
1180
1181 feba = (struct ubi_fm_eba *)(fm_raw + fm_pos);
1182 fm_pos += sizeof(*feba) + (sizeof(__be32) * vol->reserved_pebs);
1183 ubi_assert(fm_pos <= ubi->fm_size);
1184
1185 for (j = 0; j < vol->reserved_pebs; j++)
1186 feba->pnum[j] = cpu_to_be32(vol->eba_tbl[j]);
1187
1188 feba->reserved_pebs = cpu_to_be32(j);
1189 feba->magic = cpu_to_be32(UBI_FM_EBA_MAGIC);
1190 }
1191 fmh->vol_count = cpu_to_be32(vol_count);
1192 fmh->bad_peb_count = cpu_to_be32(ubi->bad_peb_count);
1193
1194 avhdr->sqnum = cpu_to_be64(ubi_next_sqnum(ubi));
1195 avhdr->lnum = 0;
1196
1197 spin_unlock(&ubi->wl_lock);
1198 spin_unlock(&ubi->volumes_lock);
1199
1200 dbg_bld("writing fastmap SB to PEB %i", new_fm->e[0]->pnum);
1201 ret = ubi_io_write_vid_hdr(ubi, new_fm->e[0]->pnum, avhdr);
1202 if (ret) {
32608703 1203 ubi_err(ubi, "unable to write vid_hdr to fastmap SB!");
dbb7d2a8
RW		 1204 goto out_kfree;
1205 }
1206
1207 for (i = 0; i < new_fm->used_blocks; i++) {
1208 fmsb->block_loc[i] = cpu_to_be32(new_fm->e[i]->pnum);
1209 fmsb->block_ec[i] = cpu_to_be32(new_fm->e[i]->ec);
1210 }
1211
1212 fmsb->data_crc = 0;
1213 fmsb->data_crc = cpu_to_be32(crc32(UBI_CRC32_INIT, fm_raw,
1214 ubi->fm_size));
1215
1216 for (i = 1; i < new_fm->used_blocks; i++) {
1217 dvhdr->sqnum = cpu_to_be64(ubi_next_sqnum(ubi));
1218 dvhdr->lnum = cpu_to_be32(i);
1219 dbg_bld("writing fastmap data to PEB %i sqnum %llu",
1220 new_fm->e[i]->pnum, be64_to_cpu(dvhdr->sqnum));
1221 ret = ubi_io_write_vid_hdr(ubi, new_fm->e[i]->pnum, dvhdr);
1222 if (ret) {
32608703 1223 ubi_err(ubi, "unable to write vid_hdr to PEB %i!",
dbb7d2a8
RW		 1224 new_fm->e[i]->pnum);
1225 goto out_kfree;
1226 }
1227 }
1228
1229 for (i = 0; i < new_fm->used_blocks; i++) {
1230 ret = ubi_io_write(ubi, fm_raw + (i * ubi->leb_size),
1231 new_fm->e[i]->pnum, ubi->leb_start, ubi->leb_size);
1232 if (ret) {
32608703 1233 ubi_err(ubi, "unable to write fastmap to PEB %i!",
dbb7d2a8
RW		 1234 new_fm->e[i]->pnum);
1235 goto out_kfree;
1236 }
1237 }
1238
1239 ubi_assert(new_fm);
1240 ubi->fm = new_fm;
1241
1242 dbg_bld("fastmap written!");
1243
1244out_kfree:
1245 ubi_free_vid_hdr(ubi, avhdr);
1246 ubi_free_vid_hdr(ubi, dvhdr);
1247out:
1248 return ret;
1249}
1250
1251/**
1252 * erase_block - Manually erase a PEB.
1253 * @ubi: UBI device object
1254 * @pnum: PEB to be erased
1255 *
1256 * Returns the new EC value on success, < 0 indicates an internal error.
1257 */
1258static int erase_block(struct ubi_device *ubi, int pnum)
1259{
1260 int ret;
1261 struct ubi_ec_hdr *ec_hdr;
1262 long long ec;
1263
1264 ec_hdr = kzalloc(ubi->ec_hdr_alsize, GFP_KERNEL);
1265 if (!ec_hdr)
1266 return -ENOMEM;
1267
1268 ret = ubi_io_read_ec_hdr(ubi, pnum, ec_hdr, 0);
1269 if (ret < 0)
1270 goto out;
1271 else if (ret && ret != UBI_IO_BITFLIPS) {
1272 ret = -EINVAL;
1273 goto out;
1274 }
1275
1276 ret = ubi_io_sync_erase(ubi, pnum, 0);
1277 if (ret < 0)
1278 goto out;
1279
1280 ec = be64_to_cpu(ec_hdr->ec);
1281 ec += ret;
1282 if (ec > UBI_MAX_ERASECOUNTER) {
1283 ret = -EINVAL;
1284 goto out;
1285 }
1286
1287 ec_hdr->ec = cpu_to_be64(ec);
1288 ret = ubi_io_write_ec_hdr(ubi, pnum, ec_hdr);
1289 if (ret < 0)
1290 goto out;
1291
1292 ret = ec;
1293out:
1294 kfree(ec_hdr);
1295 return ret;
1296}
1297
1298/**
1299 * invalidate_fastmap - destroys a fastmap.
1300 * @ubi: UBI device object
1301 * @fm: the fastmap to be destroyed
1302 *
1303 * Returns 0 on success, < 0 indicates an internal error.
1304 */
1305static int invalidate_fastmap(struct ubi_device *ubi,
1306 struct ubi_fastmap_layout *fm)
1307{
8930fa50 1308 int ret;
dbb7d2a8
RW		 1309 struct ubi_vid_hdr *vh;
1310
1311 ret = erase_block(ubi, fm->e[0]->pnum);
1312 if (ret < 0)
1313 return ret;
1314
1315 vh = new_fm_vhdr(ubi, UBI_FM_SB_VOLUME_ID);
1316 if (!vh)
1317 return -ENOMEM;
1318
1319 /* deleting the current fastmap SB is not enough, an old SB may exist,
1320 * so create a (corrupted) SB such that fastmap will find it and fall
1321 * back to scanning mode in any case */
1322 vh->sqnum = cpu_to_be64(ubi_next_sqnum(ubi));
1323 ret = ubi_io_write_vid_hdr(ubi, fm->e[0]->pnum, vh);
1324
dbb7d2a8
RW		 1325 return ret;
1326}
1327
1328/**
1329 * ubi_update_fastmap - will be called by UBI if a volume changes or
1330 * a fastmap pool becomes full.
1331 * @ubi: UBI device object
1332 *
1333 * Returns 0 on success, < 0 indicates an internal error.
1334 */
1335int ubi_update_fastmap(struct ubi_device *ubi)
1336{
1337 int ret, i;
1338 struct ubi_fastmap_layout *new_fm, *old_fm;
1339 struct ubi_wl_entry *tmp_e;
1340
1341 mutex_lock(&ubi->fm_mutex);
1342
1343 ubi_refill_pools(ubi);
1344
1345 if (ubi->ro_mode || ubi->fm_disabled) {
1346 mutex_unlock(&ubi->fm_mutex);
1347 return 0;
1348 }
1349
1350 ret = ubi_ensure_anchor_pebs(ubi);
1351 if (ret) {
1352 mutex_unlock(&ubi->fm_mutex);
1353 return ret;
1354 }
1355
1356 new_fm = kzalloc(sizeof(*new_fm), GFP_KERNEL);
1357 if (!new_fm) {
1358 mutex_unlock(&ubi->fm_mutex);
1359 return -ENOMEM;
1360 }
1361
1362 new_fm->used_blocks = ubi->fm_size / ubi->leb_size;
dbb7d2a8
RW		 1363 old_fm = ubi->fm;
1364 ubi->fm = NULL;
1365
1366 if (new_fm->used_blocks > UBI_FM_MAX_BLOCKS) {
32608703 1367 ubi_err(ubi, "fastmap too large");
dbb7d2a8
RW		 1368 ret = -ENOSPC;
1369 goto err;
1370 }
1371
1372 for (i = 1; i < new_fm->used_blocks; i++) {
1373 spin_lock(&ubi->wl_lock);
1374 tmp_e = ubi_wl_get_fm_peb(ubi, 0);
1375 spin_unlock(&ubi->wl_lock);
1376
1377 if (!tmp_e && !old_fm) {
1378 int j;
32608703 1379 ubi_err(ubi, "could not get any free erase block");
dbb7d2a8
RW		 1380
1381 for (j = 1; j < i; j++)
1382 ubi_wl_put_fm_peb(ubi, new_fm->e[j], j, 0);
1383
1384 ret = -ENOSPC;
1385 goto err;
1386 } else if (!tmp_e && old_fm) {
1387 ret = erase_block(ubi, old_fm->e[i]->pnum);
1388 if (ret < 0) {
1389 int j;
1390
1391 for (j = 1; j < i; j++)
1392 ubi_wl_put_fm_peb(ubi, new_fm->e[j],
1393 j, 0);
1394
32608703 1395 ubi_err(ubi, "could not erase old fastmap PEB");
dbb7d2a8
RW		 1396 goto err;
1397 }
c4ca6be9 1398 new_fm->e[i] = old_fm->e[i];
dbb7d2a8 1399 } else {
c4ca6be9 1400 new_fm->e[i] = tmp_e;
dbb7d2a8
RW		 1401
1402 if (old_fm)
1403 ubi_wl_put_fm_peb(ubi, old_fm->e[i], i,
1404 old_fm->to_be_tortured[i]);
1405 }
1406 }
1407
1408 spin_lock(&ubi->wl_lock);
1409 tmp_e = ubi_wl_get_fm_peb(ubi, 1);
1410 spin_unlock(&ubi->wl_lock);
1411
1412 if (old_fm) {
1413 /* no fresh anchor PEB was found, reuse the old one */
1414 if (!tmp_e) {
1415 ret = erase_block(ubi, old_fm->e[0]->pnum);
1416 if (ret < 0) {
1417 int i;
32608703 1418 ubi_err(ubi, "could not erase old anchor PEB");
dbb7d2a8
RW		 1419
1420 for (i = 1; i < new_fm->used_blocks; i++)
1421 ubi_wl_put_fm_peb(ubi, new_fm->e[i],
1422 i, 0);
1423 goto err;
1424 }
c4ca6be9 1425 new_fm->e[0] = old_fm->e[0];
dbb7d2a8
RW		 1426 new_fm->e[0]->ec = ret;
1427 } else {
1428 /* we've got a new anchor PEB, return the old one */
1429 ubi_wl_put_fm_peb(ubi, old_fm->e[0], 0,
1430 old_fm->to_be_tortured[0]);
c4ca6be9 1431 new_fm->e[0] = tmp_e;
dbb7d2a8
RW		 1432 }
1433 } else {
1434 if (!tmp_e) {
1435 int i;
32608703 1436 ubi_err(ubi, "could not find any anchor PEB");
dbb7d2a8
RW		 1437
1438 for (i = 1; i < new_fm->used_blocks; i++)
1439 ubi_wl_put_fm_peb(ubi, new_fm->e[i], i, 0);
1440
1441 ret = -ENOSPC;
1442 goto err;
1443 }
c4ca6be9 1444 new_fm->e[0] = tmp_e;
dbb7d2a8
RW		 1445 }
1446
1447 down_write(&ubi->work_sem);
1448 down_write(&ubi->fm_sem);
1449 ret = ubi_write_fastmap(ubi, new_fm);
1450 up_write(&ubi->fm_sem);
1451 up_write(&ubi->work_sem);
1452
1453 if (ret)
1454 goto err;
1455
1456out_unlock:
1457 mutex_unlock(&ubi->fm_mutex);
1458 kfree(old_fm);
1459 return ret;
1460
1461err:
1462 kfree(new_fm);
1463
32608703 1464 ubi_warn(ubi, "Unable to write new fastmap, err=%i", ret);
dbb7d2a8
RW		 1465
1466 ret = 0;
1467 if (old_fm) {
1468 ret = invalidate_fastmap(ubi, old_fm);
2d93fb36 1469 if (ret < 0) {
32608703 1470 ubi_err(ubi, "Unable to invalidiate current fastmap!");
2d93fb36
RW		 1471 ubi_ro_mode(ubi);
1472 }
dbb7d2a8
RW		 1473 else if (ret)
1474 ret = 0;
1475 }
1476 goto out_unlock;
1477}
Linux kernel - Deliverables
This page took 0.166952 seconds and 5 git commands to generate.