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UBI: Fastmap: Fix leb_count unbalance
[deliverable/linux.git] / drivers / mtd / ubi / fastmap.c
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 */
23 size_t ubi_calc_fm_size(struct ubi_device *ubi)
24 {
25 size_t size;
26
27 size = sizeof(struct ubi_fm_sb) + \
28 sizeof(struct ubi_fm_hdr) + \
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 */
47 static 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
63 out:
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 */
77 static 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 */
118 static 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
129 if (vol_id > av->vol_id)
130 p = &(*p)->rb_left;
131 else
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
153 out:
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 */
164 static 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 */
204 static 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 */
300 static 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 {
333 ubi_err(ubi, "orphaned volume in fastmap pool!");
334 kmem_cache_free(ai->aeb_slab_cache, new_aeb);
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 */
351 static 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 av->leb_count--;
366 kmem_cache_free(ai->aeb_slab_cache, aeb);
367 return;
368 }
369 }
370 }
371 }
372
373 /**
374 * scan_pool - scans a pool for changed (no longer empty PEBs).
375 * @ubi: UBI device object
376 * @ai: attach info object
377 * @pebs: an array of all PEB numbers in the to be scanned pool
378 * @pool_size: size of the pool (number of entries in @pebs)
379 * @max_sqnum: pointer to the maximal sequence number
380 * @free: list of PEBs which are most likely free (and go into @ai->free)
381 *
382 * Returns 0 on success, if the pool is unusable UBI_BAD_FASTMAP is returned.
383 * < 0 indicates an internal error.
384 */
385 static int scan_pool(struct ubi_device *ubi, struct ubi_attach_info *ai,
386 int *pebs, int pool_size, unsigned long long *max_sqnum,
387 struct list_head *free)
388 {
389 struct ubi_vid_hdr *vh;
390 struct ubi_ec_hdr *ech;
391 struct ubi_ainf_peb *new_aeb;
392 int i, pnum, err, ret = 0;
393
394 ech = kzalloc(ubi->ec_hdr_alsize, GFP_KERNEL);
395 if (!ech)
396 return -ENOMEM;
397
398 vh = ubi_zalloc_vid_hdr(ubi, GFP_KERNEL);
399 if (!vh) {
400 kfree(ech);
401 return -ENOMEM;
402 }
403
404 dbg_bld("scanning fastmap pool: size = %i", pool_size);
405
406 /*
407 * Now scan all PEBs in the pool to find changes which have been made
408 * after the creation of the fastmap
409 */
410 for (i = 0; i < pool_size; i++) {
411 int scrub = 0;
412 int image_seq;
413
414 pnum = be32_to_cpu(pebs[i]);
415
416 if (ubi_io_is_bad(ubi, pnum)) {
417 ubi_err(ubi, "bad PEB in fastmap pool!");
418 ret = UBI_BAD_FASTMAP;
419 goto out;
420 }
421
422 err = ubi_io_read_ec_hdr(ubi, pnum, ech, 0);
423 if (err && err != UBI_IO_BITFLIPS) {
424 ubi_err(ubi, "unable to read EC header! PEB:%i err:%i",
425 pnum, err);
426 ret = err > 0 ? UBI_BAD_FASTMAP : err;
427 goto out;
428 } else if (err == UBI_IO_BITFLIPS)
429 scrub = 1;
430
431 /*
432 * Older UBI implementations have image_seq set to zero, so
433 * we shouldn't fail if image_seq == 0.
434 */
435 image_seq = be32_to_cpu(ech->image_seq);
436
437 if (image_seq && (image_seq != ubi->image_seq)) {
438 ubi_err(ubi, "bad image seq: 0x%x, expected: 0x%x",
439 be32_to_cpu(ech->image_seq), ubi->image_seq);
440 ret = UBI_BAD_FASTMAP;
441 goto out;
442 }
443
444 err = ubi_io_read_vid_hdr(ubi, pnum, vh, 0);
445 if (err == UBI_IO_FF || err == UBI_IO_FF_BITFLIPS) {
446 unsigned long long ec = be64_to_cpu(ech->ec);
447 unmap_peb(ai, pnum);
448 dbg_bld("Adding PEB to free: %i", pnum);
449 if (err == UBI_IO_FF_BITFLIPS)
450 add_aeb(ai, free, pnum, ec, 1);
451 else
452 add_aeb(ai, free, pnum, ec, 0);
453 continue;
454 } else if (err == 0 || err == UBI_IO_BITFLIPS) {
455 dbg_bld("Found non empty PEB:%i in pool", pnum);
456
457 if (err == UBI_IO_BITFLIPS)
458 scrub = 1;
459
460 new_aeb = kmem_cache_alloc(ai->aeb_slab_cache,
461 GFP_KERNEL);
462 if (!new_aeb) {
463 ret = -ENOMEM;
464 goto out;
465 }
466
467 new_aeb->ec = be64_to_cpu(ech->ec);
468 new_aeb->pnum = pnum;
469 new_aeb->lnum = be32_to_cpu(vh->lnum);
470 new_aeb->sqnum = be64_to_cpu(vh->sqnum);
471 new_aeb->copy_flag = vh->copy_flag;
472 new_aeb->scrub = scrub;
473
474 if (*max_sqnum < new_aeb->sqnum)
475 *max_sqnum = new_aeb->sqnum;
476
477 err = process_pool_aeb(ubi, ai, vh, new_aeb);
478 if (err) {
479 ret = err > 0 ? UBI_BAD_FASTMAP : err;
480 goto out;
481 }
482 } else {
483 /* We are paranoid and fall back to scanning mode */
484 ubi_err(ubi, "fastmap pool PEBs contains damaged PEBs!");
485 ret = err > 0 ? UBI_BAD_FASTMAP : err;
486 goto out;
487 }
488
489 }
490
491 out:
492 ubi_free_vid_hdr(ubi, vh);
493 kfree(ech);
494 return ret;
495 }
496
497 /**
498 * count_fastmap_pebs - Counts the PEBs found by fastmap.
499 * @ai: The UBI attach info object
500 */
501 static int count_fastmap_pebs(struct ubi_attach_info *ai)
502 {
503 struct ubi_ainf_peb *aeb;
504 struct ubi_ainf_volume *av;
505 struct rb_node *rb1, *rb2;
506 int n = 0;
507
508 list_for_each_entry(aeb, &ai->erase, u.list)
509 n++;
510
511 list_for_each_entry(aeb, &ai->free, u.list)
512 n++;
513
514 ubi_rb_for_each_entry(rb1, av, &ai->volumes, rb)
515 ubi_rb_for_each_entry(rb2, aeb, &av->root, u.rb)
516 n++;
517
518 return n;
519 }
520
521 /**
522 * ubi_attach_fastmap - creates ubi_attach_info from a fastmap.
523 * @ubi: UBI device object
524 * @ai: UBI attach info object
525 * @fm: the fastmap to be attached
526 *
527 * Returns 0 on success, UBI_BAD_FASTMAP if the found fastmap was unusable.
528 * < 0 indicates an internal error.
529 */
530 static int ubi_attach_fastmap(struct ubi_device *ubi,
531 struct ubi_attach_info *ai,
532 struct ubi_fastmap_layout *fm)
533 {
534 struct list_head used, free;
535 struct ubi_ainf_volume *av;
536 struct ubi_ainf_peb *aeb, *tmp_aeb, *_tmp_aeb;
537 struct ubi_fm_sb *fmsb;
538 struct ubi_fm_hdr *fmhdr;
539 struct ubi_fm_scan_pool *fmpl1, *fmpl2;
540 struct ubi_fm_ec *fmec;
541 struct ubi_fm_volhdr *fmvhdr;
542 struct ubi_fm_eba *fm_eba;
543 int ret, i, j, pool_size, wl_pool_size;
544 size_t fm_pos = 0, fm_size = ubi->fm_size;
545 unsigned long long max_sqnum = 0;
546 void *fm_raw = ubi->fm_buf;
547
548 INIT_LIST_HEAD(&used);
549 INIT_LIST_HEAD(&free);
550 ai->min_ec = UBI_MAX_ERASECOUNTER;
551
552 fmsb = (struct ubi_fm_sb *)(fm_raw);
553 ai->max_sqnum = fmsb->sqnum;
554 fm_pos += sizeof(struct ubi_fm_sb);
555 if (fm_pos >= fm_size)
556 goto fail_bad;
557
558 fmhdr = (struct ubi_fm_hdr *)(fm_raw + fm_pos);
559 fm_pos += sizeof(*fmhdr);
560 if (fm_pos >= fm_size)
561 goto fail_bad;
562
563 if (be32_to_cpu(fmhdr->magic) != UBI_FM_HDR_MAGIC) {
564 ubi_err(ubi, "bad fastmap header magic: 0x%x, expected: 0x%x",
565 be32_to_cpu(fmhdr->magic), UBI_FM_HDR_MAGIC);
566 goto fail_bad;
567 }
568
569 fmpl1 = (struct ubi_fm_scan_pool *)(fm_raw + fm_pos);
570 fm_pos += sizeof(*fmpl1);
571 if (fm_pos >= fm_size)
572 goto fail_bad;
573 if (be32_to_cpu(fmpl1->magic) != UBI_FM_POOL_MAGIC) {
574 ubi_err(ubi, "bad fastmap pool magic: 0x%x, expected: 0x%x",
575 be32_to_cpu(fmpl1->magic), UBI_FM_POOL_MAGIC);
576 goto fail_bad;
577 }
578
579 fmpl2 = (struct ubi_fm_scan_pool *)(fm_raw + fm_pos);
580 fm_pos += sizeof(*fmpl2);
581 if (fm_pos >= fm_size)
582 goto fail_bad;
583 if (be32_to_cpu(fmpl2->magic) != UBI_FM_POOL_MAGIC) {
584 ubi_err(ubi, "bad fastmap pool magic: 0x%x, expected: 0x%x",
585 be32_to_cpu(fmpl2->magic), UBI_FM_POOL_MAGIC);
586 goto fail_bad;
587 }
588
589 pool_size = be16_to_cpu(fmpl1->size);
590 wl_pool_size = be16_to_cpu(fmpl2->size);
591 fm->max_pool_size = be16_to_cpu(fmpl1->max_size);
592 fm->max_wl_pool_size = be16_to_cpu(fmpl2->max_size);
593
594 if (pool_size > UBI_FM_MAX_POOL_SIZE || pool_size < 0) {
595 ubi_err(ubi, "bad pool size: %i", pool_size);
596 goto fail_bad;
597 }
598
599 if (wl_pool_size > UBI_FM_MAX_POOL_SIZE || wl_pool_size < 0) {
600 ubi_err(ubi, "bad WL pool size: %i", wl_pool_size);
601 goto fail_bad;
602 }
603
604
605 if (fm->max_pool_size > UBI_FM_MAX_POOL_SIZE ||
606 fm->max_pool_size < 0) {
607 ubi_err(ubi, "bad maximal pool size: %i", fm->max_pool_size);
608 goto fail_bad;
609 }
610
611 if (fm->max_wl_pool_size > UBI_FM_MAX_POOL_SIZE ||
612 fm->max_wl_pool_size < 0) {
613 ubi_err(ubi, "bad maximal WL pool size: %i",
614 fm->max_wl_pool_size);
615 goto fail_bad;
616 }
617
618 /* read EC values from free list */
619 for (i = 0; i < be32_to_cpu(fmhdr->free_peb_count); i++) {
620 fmec = (struct ubi_fm_ec *)(fm_raw + fm_pos);
621 fm_pos += sizeof(*fmec);
622 if (fm_pos >= fm_size)
623 goto fail_bad;
624
625 add_aeb(ai, &ai->free, be32_to_cpu(fmec->pnum),
626 be32_to_cpu(fmec->ec), 0);
627 }
628
629 /* read EC values from used list */
630 for (i = 0; i < be32_to_cpu(fmhdr->used_peb_count); i++) {
631 fmec = (struct ubi_fm_ec *)(fm_raw + fm_pos);
632 fm_pos += sizeof(*fmec);
633 if (fm_pos >= fm_size)
634 goto fail_bad;
635
636 add_aeb(ai, &used, be32_to_cpu(fmec->pnum),
637 be32_to_cpu(fmec->ec), 0);
638 }
639
640 /* read EC values from scrub list */
641 for (i = 0; i < be32_to_cpu(fmhdr->scrub_peb_count); i++) {
642 fmec = (struct ubi_fm_ec *)(fm_raw + fm_pos);
643 fm_pos += sizeof(*fmec);
644 if (fm_pos >= fm_size)
645 goto fail_bad;
646
647 add_aeb(ai, &used, be32_to_cpu(fmec->pnum),
648 be32_to_cpu(fmec->ec), 1);
649 }
650
651 /* read EC values from erase list */
652 for (i = 0; i < be32_to_cpu(fmhdr->erase_peb_count); i++) {
653 fmec = (struct ubi_fm_ec *)(fm_raw + fm_pos);
654 fm_pos += sizeof(*fmec);
655 if (fm_pos >= fm_size)
656 goto fail_bad;
657
658 add_aeb(ai, &ai->erase, be32_to_cpu(fmec->pnum),
659 be32_to_cpu(fmec->ec), 1);
660 }
661
662 ai->mean_ec = div_u64(ai->ec_sum, ai->ec_count);
663 ai->bad_peb_count = be32_to_cpu(fmhdr->bad_peb_count);
664
665 /* Iterate over all volumes and read their EBA table */
666 for (i = 0; i < be32_to_cpu(fmhdr->vol_count); i++) {
667 fmvhdr = (struct ubi_fm_volhdr *)(fm_raw + fm_pos);
668 fm_pos += sizeof(*fmvhdr);
669 if (fm_pos >= fm_size)
670 goto fail_bad;
671
672 if (be32_to_cpu(fmvhdr->magic) != UBI_FM_VHDR_MAGIC) {
673 ubi_err(ubi, "bad fastmap vol header magic: 0x%x, expected: 0x%x",
674 be32_to_cpu(fmvhdr->magic), UBI_FM_VHDR_MAGIC);
675 goto fail_bad;
676 }
677
678 av = add_vol(ai, be32_to_cpu(fmvhdr->vol_id),
679 be32_to_cpu(fmvhdr->used_ebs),
680 be32_to_cpu(fmvhdr->data_pad),
681 fmvhdr->vol_type,
682 be32_to_cpu(fmvhdr->last_eb_bytes));
683
684 if (!av)
685 goto fail_bad;
686
687 ai->vols_found++;
688 if (ai->highest_vol_id < be32_to_cpu(fmvhdr->vol_id))
689 ai->highest_vol_id = be32_to_cpu(fmvhdr->vol_id);
690
691 fm_eba = (struct ubi_fm_eba *)(fm_raw + fm_pos);
692 fm_pos += sizeof(*fm_eba);
693 fm_pos += (sizeof(__be32) * be32_to_cpu(fm_eba->reserved_pebs));
694 if (fm_pos >= fm_size)
695 goto fail_bad;
696
697 if (be32_to_cpu(fm_eba->magic) != UBI_FM_EBA_MAGIC) {
698 ubi_err(ubi, "bad fastmap EBA header magic: 0x%x, expected: 0x%x",
699 be32_to_cpu(fm_eba->magic), UBI_FM_EBA_MAGIC);
700 goto fail_bad;
701 }
702
703 for (j = 0; j < be32_to_cpu(fm_eba->reserved_pebs); j++) {
704 int pnum = be32_to_cpu(fm_eba->pnum[j]);
705
706 if ((int)be32_to_cpu(fm_eba->pnum[j]) < 0)
707 continue;
708
709 aeb = NULL;
710 list_for_each_entry(tmp_aeb, &used, u.list) {
711 if (tmp_aeb->pnum == pnum) {
712 aeb = tmp_aeb;
713 break;
714 }
715 }
716
717 if (!aeb) {
718 ubi_err(ubi, "PEB %i is in EBA but not in used list", pnum);
719 goto fail_bad;
720 }
721
722 aeb->lnum = j;
723
724 if (av->highest_lnum <= aeb->lnum)
725 av->highest_lnum = aeb->lnum;
726
727 assign_aeb_to_av(ai, aeb, av);
728
729 dbg_bld("inserting PEB:%i (LEB %i) to vol %i",
730 aeb->pnum, aeb->lnum, av->vol_id);
731 }
732 }
733
734 ret = scan_pool(ubi, ai, fmpl1->pebs, pool_size, &max_sqnum, &free);
735 if (ret)
736 goto fail;
737
738 ret = scan_pool(ubi, ai, fmpl2->pebs, wl_pool_size, &max_sqnum, &free);
739 if (ret)
740 goto fail;
741
742 if (max_sqnum > ai->max_sqnum)
743 ai->max_sqnum = max_sqnum;
744
745 list_for_each_entry_safe(tmp_aeb, _tmp_aeb, &free, u.list)
746 list_move_tail(&tmp_aeb->u.list, &ai->free);
747
748 list_for_each_entry_safe(tmp_aeb, _tmp_aeb, &used, u.list)
749 list_move_tail(&tmp_aeb->u.list, &ai->erase);
750
751 ubi_assert(list_empty(&free));
752
753 /*
754 * If fastmap is leaking PEBs (must not happen), raise a
755 * fat warning and fall back to scanning mode.
756 * We do this here because in ubi_wl_init() it's too late
757 * and we cannot fall back to scanning.
758 */
759 if (WARN_ON(count_fastmap_pebs(ai) != ubi->peb_count -
760 ai->bad_peb_count - fm->used_blocks))
761 goto fail_bad;
762
763 return 0;
764
765 fail_bad:
766 ret = UBI_BAD_FASTMAP;
767 fail:
768 list_for_each_entry_safe(tmp_aeb, _tmp_aeb, &used, u.list) {
769 list_del(&tmp_aeb->u.list);
770 kmem_cache_free(ai->aeb_slab_cache, tmp_aeb);
771 }
772 list_for_each_entry_safe(tmp_aeb, _tmp_aeb, &free, u.list) {
773 list_del(&tmp_aeb->u.list);
774 kmem_cache_free(ai->aeb_slab_cache, tmp_aeb);
775 }
776
777 return ret;
778 }
779
780 /**
781 * ubi_scan_fastmap - scan the fastmap.
782 * @ubi: UBI device object
783 * @ai: UBI attach info to be filled
784 * @fm_anchor: The fastmap starts at this PEB
785 *
786 * Returns 0 on success, UBI_NO_FASTMAP if no fastmap was found,
787 * UBI_BAD_FASTMAP if one was found but is not usable.
788 * < 0 indicates an internal error.
789 */
790 int ubi_scan_fastmap(struct ubi_device *ubi, struct ubi_attach_info *ai,
791 int fm_anchor)
792 {
793 struct ubi_fm_sb *fmsb, *fmsb2;
794 struct ubi_vid_hdr *vh;
795 struct ubi_ec_hdr *ech;
796 struct ubi_fastmap_layout *fm;
797 int i, used_blocks, pnum, ret = 0;
798 size_t fm_size;
799 __be32 crc, tmp_crc;
800 unsigned long long sqnum = 0;
801
802 mutex_lock(&ubi->fm_mutex);
803 memset(ubi->fm_buf, 0, ubi->fm_size);
804
805 fmsb = kmalloc(sizeof(*fmsb), GFP_KERNEL);
806 if (!fmsb) {
807 ret = -ENOMEM;
808 goto out;
809 }
810
811 fm = kzalloc(sizeof(*fm), GFP_KERNEL);
812 if (!fm) {
813 ret = -ENOMEM;
814 kfree(fmsb);
815 goto out;
816 }
817
818 ret = ubi_io_read(ubi, fmsb, fm_anchor, ubi->leb_start, sizeof(*fmsb));
819 if (ret && ret != UBI_IO_BITFLIPS)
820 goto free_fm_sb;
821 else if (ret == UBI_IO_BITFLIPS)
822 fm->to_be_tortured[0] = 1;
823
824 if (be32_to_cpu(fmsb->magic) != UBI_FM_SB_MAGIC) {
825 ubi_err(ubi, "bad super block magic: 0x%x, expected: 0x%x",
826 be32_to_cpu(fmsb->magic), UBI_FM_SB_MAGIC);
827 ret = UBI_BAD_FASTMAP;
828 goto free_fm_sb;
829 }
830
831 if (fmsb->version != UBI_FM_FMT_VERSION) {
832 ubi_err(ubi, "bad fastmap version: %i, expected: %i",
833 fmsb->version, UBI_FM_FMT_VERSION);
834 ret = UBI_BAD_FASTMAP;
835 goto free_fm_sb;
836 }
837
838 used_blocks = be32_to_cpu(fmsb->used_blocks);
839 if (used_blocks > UBI_FM_MAX_BLOCKS || used_blocks < 1) {
840 ubi_err(ubi, "number of fastmap blocks is invalid: %i",
841 used_blocks);
842 ret = UBI_BAD_FASTMAP;
843 goto free_fm_sb;
844 }
845
846 fm_size = ubi->leb_size * used_blocks;
847 if (fm_size != ubi->fm_size) {
848 ubi_err(ubi, "bad fastmap size: %zi, expected: %zi",
849 fm_size, ubi->fm_size);
850 ret = UBI_BAD_FASTMAP;
851 goto free_fm_sb;
852 }
853
854 ech = kzalloc(ubi->ec_hdr_alsize, GFP_KERNEL);
855 if (!ech) {
856 ret = -ENOMEM;
857 goto free_fm_sb;
858 }
859
860 vh = ubi_zalloc_vid_hdr(ubi, GFP_KERNEL);
861 if (!vh) {
862 ret = -ENOMEM;
863 goto free_hdr;
864 }
865
866 for (i = 0; i < used_blocks; i++) {
867 int image_seq;
868
869 pnum = be32_to_cpu(fmsb->block_loc[i]);
870
871 if (ubi_io_is_bad(ubi, pnum)) {
872 ret = UBI_BAD_FASTMAP;
873 goto free_hdr;
874 }
875
876 ret = ubi_io_read_ec_hdr(ubi, pnum, ech, 0);
877 if (ret && ret != UBI_IO_BITFLIPS) {
878 ubi_err(ubi, "unable to read fastmap block# %i EC (PEB: %i)",
879 i, pnum);
880 if (ret > 0)
881 ret = UBI_BAD_FASTMAP;
882 goto free_hdr;
883 } else if (ret == UBI_IO_BITFLIPS)
884 fm->to_be_tortured[i] = 1;
885
886 image_seq = be32_to_cpu(ech->image_seq);
887 if (!ubi->image_seq)
888 ubi->image_seq = image_seq;
889
890 /*
891 * Older UBI implementations have image_seq set to zero, so
892 * we shouldn't fail if image_seq == 0.
893 */
894 if (image_seq && (image_seq != ubi->image_seq)) {
895 ubi_err(ubi, "wrong image seq:%d instead of %d",
896 be32_to_cpu(ech->image_seq), ubi->image_seq);
897 ret = UBI_BAD_FASTMAP;
898 goto free_hdr;
899 }
900
901 ret = ubi_io_read_vid_hdr(ubi, pnum, vh, 0);
902 if (ret && ret != UBI_IO_BITFLIPS) {
903 ubi_err(ubi, "unable to read fastmap block# %i (PEB: %i)",
904 i, pnum);
905 goto free_hdr;
906 }
907
908 if (i == 0) {
909 if (be32_to_cpu(vh->vol_id) != UBI_FM_SB_VOLUME_ID) {
910 ubi_err(ubi, "bad fastmap anchor vol_id: 0x%x, expected: 0x%x",
911 be32_to_cpu(vh->vol_id),
912 UBI_FM_SB_VOLUME_ID);
913 ret = UBI_BAD_FASTMAP;
914 goto free_hdr;
915 }
916 } else {
917 if (be32_to_cpu(vh->vol_id) != UBI_FM_DATA_VOLUME_ID) {
918 ubi_err(ubi, "bad fastmap data vol_id: 0x%x, expected: 0x%x",
919 be32_to_cpu(vh->vol_id),
920 UBI_FM_DATA_VOLUME_ID);
921 ret = UBI_BAD_FASTMAP;
922 goto free_hdr;
923 }
924 }
925
926 if (sqnum < be64_to_cpu(vh->sqnum))
927 sqnum = be64_to_cpu(vh->sqnum);
928
929 ret = ubi_io_read(ubi, ubi->fm_buf + (ubi->leb_size * i), pnum,
930 ubi->leb_start, ubi->leb_size);
931 if (ret && ret != UBI_IO_BITFLIPS) {
932 ubi_err(ubi, "unable to read fastmap block# %i (PEB: %i, "
933 "err: %i)", i, pnum, ret);
934 goto free_hdr;
935 }
936 }
937
938 kfree(fmsb);
939 fmsb = NULL;
940
941 fmsb2 = (struct ubi_fm_sb *)(ubi->fm_buf);
942 tmp_crc = be32_to_cpu(fmsb2->data_crc);
943 fmsb2->data_crc = 0;
944 crc = crc32(UBI_CRC32_INIT, ubi->fm_buf, fm_size);
945 if (crc != tmp_crc) {
946 ubi_err(ubi, "fastmap data CRC is invalid");
947 ubi_err(ubi, "CRC should be: 0x%x, calc: 0x%x",
948 tmp_crc, crc);
949 ret = UBI_BAD_FASTMAP;
950 goto free_hdr;
951 }
952
953 fmsb2->sqnum = sqnum;
954
955 fm->used_blocks = used_blocks;
956
957 ret = ubi_attach_fastmap(ubi, ai, fm);
958 if (ret) {
959 if (ret > 0)
960 ret = UBI_BAD_FASTMAP;
961 goto free_hdr;
962 }
963
964 for (i = 0; i < used_blocks; i++) {
965 struct ubi_wl_entry *e;
966
967 e = kmem_cache_alloc(ubi_wl_entry_slab, GFP_KERNEL);
968 if (!e) {
969 while (i--)
970 kfree(fm->e[i]);
971
972 ret = -ENOMEM;
973 goto free_hdr;
974 }
975
976 e->pnum = be32_to_cpu(fmsb2->block_loc[i]);
977 e->ec = be32_to_cpu(fmsb2->block_ec[i]);
978 fm->e[i] = e;
979 }
980
981 ubi->fm = fm;
982 ubi->fm_pool.max_size = ubi->fm->max_pool_size;
983 ubi->fm_wl_pool.max_size = ubi->fm->max_wl_pool_size;
984 ubi_msg(ubi, "attached by fastmap");
985 ubi_msg(ubi, "fastmap pool size: %d", ubi->fm_pool.max_size);
986 ubi_msg(ubi, "fastmap WL pool size: %d",
987 ubi->fm_wl_pool.max_size);
988 ubi->fm_disabled = 0;
989
990 ubi_free_vid_hdr(ubi, vh);
991 kfree(ech);
992 out:
993 mutex_unlock(&ubi->fm_mutex);
994 if (ret == UBI_BAD_FASTMAP)
995 ubi_err(ubi, "Attach by fastmap failed, doing a full scan!");
996 return ret;
997
998 free_hdr:
999 ubi_free_vid_hdr(ubi, vh);
1000 kfree(ech);
1001 free_fm_sb:
1002 kfree(fmsb);
1003 kfree(fm);
1004 goto out;
1005 }
1006
1007 /**
1008 * ubi_write_fastmap - writes a fastmap.
1009 * @ubi: UBI device object
1010 * @new_fm: the to be written fastmap
1011 *
1012 * Returns 0 on success, < 0 indicates an internal error.
1013 */
1014 static int ubi_write_fastmap(struct ubi_device *ubi,
1015 struct ubi_fastmap_layout *new_fm)
1016 {
1017 size_t fm_pos = 0;
1018 void *fm_raw;
1019 struct ubi_fm_sb *fmsb;
1020 struct ubi_fm_hdr *fmh;
1021 struct ubi_fm_scan_pool *fmpl1, *fmpl2;
1022 struct ubi_fm_ec *fec;
1023 struct ubi_fm_volhdr *fvh;
1024 struct ubi_fm_eba *feba;
1025 struct rb_node *node;
1026 struct ubi_wl_entry *wl_e;
1027 struct ubi_volume *vol;
1028 struct ubi_vid_hdr *avhdr, *dvhdr;
1029 struct ubi_work *ubi_wrk;
1030 int ret, i, j, free_peb_count, used_peb_count, vol_count;
1031 int scrub_peb_count, erase_peb_count;
1032
1033 fm_raw = ubi->fm_buf;
1034 memset(ubi->fm_buf, 0, ubi->fm_size);
1035
1036 avhdr = new_fm_vhdr(ubi, UBI_FM_SB_VOLUME_ID);
1037 if (!avhdr) {
1038 ret = -ENOMEM;
1039 goto out;
1040 }
1041
1042 dvhdr = new_fm_vhdr(ubi, UBI_FM_DATA_VOLUME_ID);
1043 if (!dvhdr) {
1044 ret = -ENOMEM;
1045 goto out_kfree;
1046 }
1047
1048 spin_lock(&ubi->volumes_lock);
1049 spin_lock(&ubi->wl_lock);
1050
1051 fmsb = (struct ubi_fm_sb *)fm_raw;
1052 fm_pos += sizeof(*fmsb);
1053 ubi_assert(fm_pos <= ubi->fm_size);
1054
1055 fmh = (struct ubi_fm_hdr *)(fm_raw + fm_pos);
1056 fm_pos += sizeof(*fmh);
1057 ubi_assert(fm_pos <= ubi->fm_size);
1058
1059 fmsb->magic = cpu_to_be32(UBI_FM_SB_MAGIC);
1060 fmsb->version = UBI_FM_FMT_VERSION;
1061 fmsb->used_blocks = cpu_to_be32(new_fm->used_blocks);
1062 /* the max sqnum will be filled in while *reading* the fastmap */
1063 fmsb->sqnum = 0;
1064
1065 fmh->magic = cpu_to_be32(UBI_FM_HDR_MAGIC);
1066 free_peb_count = 0;
1067 used_peb_count = 0;
1068 scrub_peb_count = 0;
1069 erase_peb_count = 0;
1070 vol_count = 0;
1071
1072 fmpl1 = (struct ubi_fm_scan_pool *)(fm_raw + fm_pos);
1073 fm_pos += sizeof(*fmpl1);
1074 fmpl1->magic = cpu_to_be32(UBI_FM_POOL_MAGIC);
1075 fmpl1->size = cpu_to_be16(ubi->fm_pool.size);
1076 fmpl1->max_size = cpu_to_be16(ubi->fm_pool.max_size);
1077
1078 for (i = 0; i < ubi->fm_pool.size; i++)
1079 fmpl1->pebs[i] = cpu_to_be32(ubi->fm_pool.pebs[i]);
1080
1081 fmpl2 = (struct ubi_fm_scan_pool *)(fm_raw + fm_pos);
1082 fm_pos += sizeof(*fmpl2);
1083 fmpl2->magic = cpu_to_be32(UBI_FM_POOL_MAGIC);
1084 fmpl2->size = cpu_to_be16(ubi->fm_wl_pool.size);
1085 fmpl2->max_size = cpu_to_be16(ubi->fm_wl_pool.max_size);
1086
1087 for (i = 0; i < ubi->fm_wl_pool.size; i++)
1088 fmpl2->pebs[i] = cpu_to_be32(ubi->fm_wl_pool.pebs[i]);
1089
1090 for (node = rb_first(&ubi->free); node; node = rb_next(node)) {
1091 wl_e = rb_entry(node, struct ubi_wl_entry, u.rb);
1092 fec = (struct ubi_fm_ec *)(fm_raw + fm_pos);
1093
1094 fec->pnum = cpu_to_be32(wl_e->pnum);
1095 fec->ec = cpu_to_be32(wl_e->ec);
1096
1097 free_peb_count++;
1098 fm_pos += sizeof(*fec);
1099 ubi_assert(fm_pos <= ubi->fm_size);
1100 }
1101 fmh->free_peb_count = cpu_to_be32(free_peb_count);
1102
1103 for (node = rb_first(&ubi->used); node; node = rb_next(node)) {
1104 wl_e = rb_entry(node, struct ubi_wl_entry, u.rb);
1105 fec = (struct ubi_fm_ec *)(fm_raw + fm_pos);
1106
1107 fec->pnum = cpu_to_be32(wl_e->pnum);
1108 fec->ec = cpu_to_be32(wl_e->ec);
1109
1110 used_peb_count++;
1111 fm_pos += sizeof(*fec);
1112 ubi_assert(fm_pos <= ubi->fm_size);
1113 }
1114
1115 for (i = 0; i < UBI_PROT_QUEUE_LEN; i++) {
1116 list_for_each_entry(wl_e, &ubi->pq[i], u.list) {
1117 fec = (struct ubi_fm_ec *)(fm_raw + fm_pos);
1118
1119 fec->pnum = cpu_to_be32(wl_e->pnum);
1120 fec->ec = cpu_to_be32(wl_e->ec);
1121
1122 used_peb_count++;
1123 fm_pos += sizeof(*fec);
1124 ubi_assert(fm_pos <= ubi->fm_size);
1125 }
1126 }
1127 fmh->used_peb_count = cpu_to_be32(used_peb_count);
1128
1129 for (node = rb_first(&ubi->scrub); node; node = rb_next(node)) {
1130 wl_e = rb_entry(node, struct ubi_wl_entry, u.rb);
1131 fec = (struct ubi_fm_ec *)(fm_raw + fm_pos);
1132
1133 fec->pnum = cpu_to_be32(wl_e->pnum);
1134 fec->ec = cpu_to_be32(wl_e->ec);
1135
1136 scrub_peb_count++;
1137 fm_pos += sizeof(*fec);
1138 ubi_assert(fm_pos <= ubi->fm_size);
1139 }
1140 fmh->scrub_peb_count = cpu_to_be32(scrub_peb_count);
1141
1142
1143 list_for_each_entry(ubi_wrk, &ubi->works, list) {
1144 if (ubi_is_erase_work(ubi_wrk)) {
1145 wl_e = ubi_wrk->e;
1146 ubi_assert(wl_e);
1147
1148 fec = (struct ubi_fm_ec *)(fm_raw + fm_pos);
1149
1150 fec->pnum = cpu_to_be32(wl_e->pnum);
1151 fec->ec = cpu_to_be32(wl_e->ec);
1152
1153 erase_peb_count++;
1154 fm_pos += sizeof(*fec);
1155 ubi_assert(fm_pos <= ubi->fm_size);
1156 }
1157 }
1158 fmh->erase_peb_count = cpu_to_be32(erase_peb_count);
1159
1160 for (i = 0; i < UBI_MAX_VOLUMES + UBI_INT_VOL_COUNT; i++) {
1161 vol = ubi->volumes[i];
1162
1163 if (!vol)
1164 continue;
1165
1166 vol_count++;
1167
1168 fvh = (struct ubi_fm_volhdr *)(fm_raw + fm_pos);
1169 fm_pos += sizeof(*fvh);
1170 ubi_assert(fm_pos <= ubi->fm_size);
1171
1172 fvh->magic = cpu_to_be32(UBI_FM_VHDR_MAGIC);
1173 fvh->vol_id = cpu_to_be32(vol->vol_id);
1174 fvh->vol_type = vol->vol_type;
1175 fvh->used_ebs = cpu_to_be32(vol->used_ebs);
1176 fvh->data_pad = cpu_to_be32(vol->data_pad);
1177 fvh->last_eb_bytes = cpu_to_be32(vol->last_eb_bytes);
1178
1179 ubi_assert(vol->vol_type == UBI_DYNAMIC_VOLUME ||
1180 vol->vol_type == UBI_STATIC_VOLUME);
1181
1182 feba = (struct ubi_fm_eba *)(fm_raw + fm_pos);
1183 fm_pos += sizeof(*feba) + (sizeof(__be32) * vol->reserved_pebs);
1184 ubi_assert(fm_pos <= ubi->fm_size);
1185
1186 for (j = 0; j < vol->reserved_pebs; j++)
1187 feba->pnum[j] = cpu_to_be32(vol->eba_tbl[j]);
1188
1189 feba->reserved_pebs = cpu_to_be32(j);
1190 feba->magic = cpu_to_be32(UBI_FM_EBA_MAGIC);
1191 }
1192 fmh->vol_count = cpu_to_be32(vol_count);
1193 fmh->bad_peb_count = cpu_to_be32(ubi->bad_peb_count);
1194
1195 avhdr->sqnum = cpu_to_be64(ubi_next_sqnum(ubi));
1196 avhdr->lnum = 0;
1197
1198 spin_unlock(&ubi->wl_lock);
1199 spin_unlock(&ubi->volumes_lock);
1200
1201 dbg_bld("writing fastmap SB to PEB %i", new_fm->e[0]->pnum);
1202 ret = ubi_io_write_vid_hdr(ubi, new_fm->e[0]->pnum, avhdr);
1203 if (ret) {
1204 ubi_err(ubi, "unable to write vid_hdr to fastmap SB!");
1205 goto out_kfree;
1206 }
1207
1208 for (i = 0; i < new_fm->used_blocks; i++) {
1209 fmsb->block_loc[i] = cpu_to_be32(new_fm->e[i]->pnum);
1210 fmsb->block_ec[i] = cpu_to_be32(new_fm->e[i]->ec);
1211 }
1212
1213 fmsb->data_crc = 0;
1214 fmsb->data_crc = cpu_to_be32(crc32(UBI_CRC32_INIT, fm_raw,
1215 ubi->fm_size));
1216
1217 for (i = 1; i < new_fm->used_blocks; i++) {
1218 dvhdr->sqnum = cpu_to_be64(ubi_next_sqnum(ubi));
1219 dvhdr->lnum = cpu_to_be32(i);
1220 dbg_bld("writing fastmap data to PEB %i sqnum %llu",
1221 new_fm->e[i]->pnum, be64_to_cpu(dvhdr->sqnum));
1222 ret = ubi_io_write_vid_hdr(ubi, new_fm->e[i]->pnum, dvhdr);
1223 if (ret) {
1224 ubi_err(ubi, "unable to write vid_hdr to PEB %i!",
1225 new_fm->e[i]->pnum);
1226 goto out_kfree;
1227 }
1228 }
1229
1230 for (i = 0; i < new_fm->used_blocks; i++) {
1231 ret = ubi_io_write(ubi, fm_raw + (i * ubi->leb_size),
1232 new_fm->e[i]->pnum, ubi->leb_start, ubi->leb_size);
1233 if (ret) {
1234 ubi_err(ubi, "unable to write fastmap to PEB %i!",
1235 new_fm->e[i]->pnum);
1236 goto out_kfree;
1237 }
1238 }
1239
1240 ubi_assert(new_fm);
1241 ubi->fm = new_fm;
1242
1243 dbg_bld("fastmap written!");
1244
1245 out_kfree:
1246 ubi_free_vid_hdr(ubi, avhdr);
1247 ubi_free_vid_hdr(ubi, dvhdr);
1248 out:
1249 return ret;
1250 }
1251
1252 /**
1253 * erase_block - Manually erase a PEB.
1254 * @ubi: UBI device object
1255 * @pnum: PEB to be erased
1256 *
1257 * Returns the new EC value on success, < 0 indicates an internal error.
1258 */
1259 static int erase_block(struct ubi_device *ubi, int pnum)
1260 {
1261 int ret;
1262 struct ubi_ec_hdr *ec_hdr;
1263 long long ec;
1264
1265 ec_hdr = kzalloc(ubi->ec_hdr_alsize, GFP_KERNEL);
1266 if (!ec_hdr)
1267 return -ENOMEM;
1268
1269 ret = ubi_io_read_ec_hdr(ubi, pnum, ec_hdr, 0);
1270 if (ret < 0)
1271 goto out;
1272 else if (ret && ret != UBI_IO_BITFLIPS) {
1273 ret = -EINVAL;
1274 goto out;
1275 }
1276
1277 ret = ubi_io_sync_erase(ubi, pnum, 0);
1278 if (ret < 0)
1279 goto out;
1280
1281 ec = be64_to_cpu(ec_hdr->ec);
1282 ec += ret;
1283 if (ec > UBI_MAX_ERASECOUNTER) {
1284 ret = -EINVAL;
1285 goto out;
1286 }
1287
1288 ec_hdr->ec = cpu_to_be64(ec);
1289 ret = ubi_io_write_ec_hdr(ubi, pnum, ec_hdr);
1290 if (ret < 0)
1291 goto out;
1292
1293 ret = ec;
1294 out:
1295 kfree(ec_hdr);
1296 return ret;
1297 }
1298
1299 /**
1300 * invalidate_fastmap - destroys a fastmap.
1301 * @ubi: UBI device object
1302 * @fm: the fastmap to be destroyed
1303 *
1304 * Returns 0 on success, < 0 indicates an internal error.
1305 */
1306 static int invalidate_fastmap(struct ubi_device *ubi,
1307 struct ubi_fastmap_layout *fm)
1308 {
1309 int ret;
1310 struct ubi_vid_hdr *vh;
1311
1312 ret = erase_block(ubi, fm->e[0]->pnum);
1313 if (ret < 0)
1314 return ret;
1315
1316 vh = new_fm_vhdr(ubi, UBI_FM_SB_VOLUME_ID);
1317 if (!vh)
1318 return -ENOMEM;
1319
1320 /* deleting the current fastmap SB is not enough, an old SB may exist,
1321 * so create a (corrupted) SB such that fastmap will find it and fall
1322 * back to scanning mode in any case */
1323 vh->sqnum = cpu_to_be64(ubi_next_sqnum(ubi));
1324 ret = ubi_io_write_vid_hdr(ubi, fm->e[0]->pnum, vh);
1325
1326 return ret;
1327 }
1328
1329 /**
1330 * ubi_update_fastmap - will be called by UBI if a volume changes or
1331 * a fastmap pool becomes full.
1332 * @ubi: UBI device object
1333 *
1334 * Returns 0 on success, < 0 indicates an internal error.
1335 */
1336 int ubi_update_fastmap(struct ubi_device *ubi)
1337 {
1338 int ret, i;
1339 struct ubi_fastmap_layout *new_fm, *old_fm;
1340 struct ubi_wl_entry *tmp_e;
1341
1342 mutex_lock(&ubi->fm_mutex);
1343
1344 ubi_refill_pools(ubi);
1345
1346 if (ubi->ro_mode || ubi->fm_disabled) {
1347 mutex_unlock(&ubi->fm_mutex);
1348 return 0;
1349 }
1350
1351 ret = ubi_ensure_anchor_pebs(ubi);
1352 if (ret) {
1353 mutex_unlock(&ubi->fm_mutex);
1354 return ret;
1355 }
1356
1357 new_fm = kzalloc(sizeof(*new_fm), GFP_KERNEL);
1358 if (!new_fm) {
1359 mutex_unlock(&ubi->fm_mutex);
1360 return -ENOMEM;
1361 }
1362
1363 new_fm->used_blocks = ubi->fm_size / ubi->leb_size;
1364 old_fm = ubi->fm;
1365 ubi->fm = NULL;
1366
1367 if (new_fm->used_blocks > UBI_FM_MAX_BLOCKS) {
1368 ubi_err(ubi, "fastmap too large");
1369 ret = -ENOSPC;
1370 goto err;
1371 }
1372
1373 for (i = 1; i < new_fm->used_blocks; i++) {
1374 spin_lock(&ubi->wl_lock);
1375 tmp_e = ubi_wl_get_fm_peb(ubi, 0);
1376 spin_unlock(&ubi->wl_lock);
1377
1378 if (!tmp_e && !old_fm) {
1379 int j;
1380 ubi_err(ubi, "could not get any free erase block");
1381
1382 for (j = 1; j < i; j++)
1383 ubi_wl_put_fm_peb(ubi, new_fm->e[j], j, 0);
1384
1385 ret = -ENOSPC;
1386 goto err;
1387 } else if (!tmp_e && old_fm) {
1388 ret = erase_block(ubi, old_fm->e[i]->pnum);
1389 if (ret < 0) {
1390 int j;
1391
1392 for (j = 1; j < i; j++)
1393 ubi_wl_put_fm_peb(ubi, new_fm->e[j],
1394 j, 0);
1395
1396 ubi_err(ubi, "could not erase old fastmap PEB");
1397 goto err;
1398 }
1399 new_fm->e[i] = old_fm->e[i];
1400 } else {
1401 new_fm->e[i] = tmp_e;
1402
1403 if (old_fm)
1404 ubi_wl_put_fm_peb(ubi, old_fm->e[i], i,
1405 old_fm->to_be_tortured[i]);
1406 }
1407 }
1408
1409 spin_lock(&ubi->wl_lock);
1410 tmp_e = ubi_wl_get_fm_peb(ubi, 1);
1411 spin_unlock(&ubi->wl_lock);
1412
1413 if (old_fm) {
1414 /* no fresh anchor PEB was found, reuse the old one */
1415 if (!tmp_e) {
1416 ret = erase_block(ubi, old_fm->e[0]->pnum);
1417 if (ret < 0) {
1418 int i;
1419 ubi_err(ubi, "could not erase old anchor PEB");
1420
1421 for (i = 1; i < new_fm->used_blocks; i++)
1422 ubi_wl_put_fm_peb(ubi, new_fm->e[i],
1423 i, 0);
1424 goto err;
1425 }
1426 new_fm->e[0] = old_fm->e[0];
1427 new_fm->e[0]->ec = ret;
1428 } else {
1429 /* we've got a new anchor PEB, return the old one */
1430 ubi_wl_put_fm_peb(ubi, old_fm->e[0], 0,
1431 old_fm->to_be_tortured[0]);
1432 new_fm->e[0] = tmp_e;
1433 }
1434 } else {
1435 if (!tmp_e) {
1436 int i;
1437 ubi_err(ubi, "could not find any anchor PEB");
1438
1439 for (i = 1; i < new_fm->used_blocks; i++)
1440 ubi_wl_put_fm_peb(ubi, new_fm->e[i], i, 0);
1441
1442 ret = -ENOSPC;
1443 goto err;
1444 }
1445 new_fm->e[0] = tmp_e;
1446 }
1447
1448 down_write(&ubi->work_sem);
1449 down_write(&ubi->fm_sem);
1450 ret = ubi_write_fastmap(ubi, new_fm);
1451 up_write(&ubi->fm_sem);
1452 up_write(&ubi->work_sem);
1453
1454 if (ret)
1455 goto err;
1456
1457 out_unlock:
1458 mutex_unlock(&ubi->fm_mutex);
1459 kfree(old_fm);
1460 return ret;
1461
1462 err:
1463 kfree(new_fm);
1464
1465 ubi_warn(ubi, "Unable to write new fastmap, err=%i", ret);
1466
1467 ret = 0;
1468 if (old_fm) {
1469 ret = invalidate_fastmap(ubi, old_fm);
1470 if (ret < 0) {
1471 ubi_err(ubi, "Unable to invalidiate current fastmap!");
1472 ubi_ro_mode(ubi);
1473 }
1474 else if (ret)
1475 ret = 0;
1476 }
1477 goto out_unlock;
1478 }
Linux kernel - Deliverables
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