]> git.proxmox.com Git - mirror_ubuntu-artful-kernel.git/blame - drivers/mtd/ubi/fastmap.c
projects / mirror_ubuntu-artful-kernel.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
UBI: Fastmap: Fix race in ubi_eba_atomic_leb_change()
[mirror_ubuntu-artful-kernel.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
379 * @eba_orphans: list of PEBs which need to be scanned
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 */
385static 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 *eba_orphans, struct list_head *free)
388{
389 struct ubi_vid_hdr *vh;
390 struct ubi_ec_hdr *ech;
391 struct ubi_ainf_peb *new_aeb, *tmp_aeb;
392 int i, pnum, err, found_orphan, 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;
c22301ad 412 int image_seq;
dbb7d2a8
RW		 413
414 pnum = be32_to_cpu(pebs[i]);
415
416 if (ubi_io_is_bad(ubi, pnum)) {
32608703 417 ubi_err(ubi, "bad PEB in fastmap pool!");
dbb7d2a8
RW		 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) {
32608703 424 ubi_err(ubi, "unable to read EC header! PEB:%i err:%i",
dbb7d2a8
RW		 425 pnum, err);
426 ret = err > 0 ? UBI_BAD_FASTMAP : err;
427 goto out;
44305ebd 428 } else if (err == UBI_IO_BITFLIPS)
dbb7d2a8
RW		 429 scrub = 1;
430
c22301ad
RG		 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)) {
32608703 438 ubi_err(ubi, "bad image seq: 0x%x, expected: 0x%x",
dbb7d2a8 439 be32_to_cpu(ech->image_seq), ubi->image_seq);
f240dca8 440 ret = UBI_BAD_FASTMAP;
dbb7d2a8
RW		 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 found_orphan = 0;
461 list_for_each_entry(tmp_aeb, eba_orphans, u.list) {
462 if (tmp_aeb->pnum == pnum) {
463 found_orphan = 1;
464 break;
465 }
466 }
467 if (found_orphan) {
dbb7d2a8 468 list_del(&tmp_aeb->u.list);
5547fec7 469 kmem_cache_free(ai->aeb_slab_cache, tmp_aeb);
dbb7d2a8
RW		 470 }
471
472 new_aeb = kmem_cache_alloc(ai->aeb_slab_cache,
473 GFP_KERNEL);
474 if (!new_aeb) {
475 ret = -ENOMEM;
476 goto out;
477 }
478
479 new_aeb->ec = be64_to_cpu(ech->ec);
480 new_aeb->pnum = pnum;
481 new_aeb->lnum = be32_to_cpu(vh->lnum);
482 new_aeb->sqnum = be64_to_cpu(vh->sqnum);
483 new_aeb->copy_flag = vh->copy_flag;
484 new_aeb->scrub = scrub;
485
486 if (*max_sqnum < new_aeb->sqnum)
487 *max_sqnum = new_aeb->sqnum;
488
489 err = process_pool_aeb(ubi, ai, vh, new_aeb);
490 if (err) {
491 ret = err > 0 ? UBI_BAD_FASTMAP : err;
492 goto out;
493 }
494 } else {
495 /* We are paranoid and fall back to scanning mode */
32608703 496 ubi_err(ubi, "fastmap pool PEBs contains damaged PEBs!");
dbb7d2a8
RW		 497 ret = err > 0 ? UBI_BAD_FASTMAP : err;
498 goto out;
499 }
500
501 }
502
503out:
504 ubi_free_vid_hdr(ubi, vh);
505 kfree(ech);
506 return ret;
507}
508
509/**
510 * count_fastmap_pebs - Counts the PEBs found by fastmap.
511 * @ai: The UBI attach info object
512 */
513static int count_fastmap_pebs(struct ubi_attach_info *ai)
514{
515 struct ubi_ainf_peb *aeb;
516 struct ubi_ainf_volume *av;
517 struct rb_node *rb1, *rb2;
518 int n = 0;
519
520 list_for_each_entry(aeb, &ai->erase, u.list)
521 n++;
522
523 list_for_each_entry(aeb, &ai->free, u.list)
524 n++;
525
526 ubi_rb_for_each_entry(rb1, av, &ai->volumes, rb)
527 ubi_rb_for_each_entry(rb2, aeb, &av->root, u.rb)
528 n++;
529
530 return n;
531}
532
533/**
534 * ubi_attach_fastmap - creates ubi_attach_info from a fastmap.
535 * @ubi: UBI device object
536 * @ai: UBI attach info object
537 * @fm: the fastmap to be attached
538 *
539 * Returns 0 on success, UBI_BAD_FASTMAP if the found fastmap was unusable.
540 * < 0 indicates an internal error.
541 */
542static int ubi_attach_fastmap(struct ubi_device *ubi,
543 struct ubi_attach_info *ai,
544 struct ubi_fastmap_layout *fm)
545{
546 struct list_head used, eba_orphans, free;
547 struct ubi_ainf_volume *av;
548 struct ubi_ainf_peb *aeb, *tmp_aeb, *_tmp_aeb;
549 struct ubi_ec_hdr *ech;
550 struct ubi_fm_sb *fmsb;
551 struct ubi_fm_hdr *fmhdr;
552 struct ubi_fm_scan_pool *fmpl1, *fmpl2;
553 struct ubi_fm_ec *fmec;
554 struct ubi_fm_volhdr *fmvhdr;
555 struct ubi_fm_eba *fm_eba;
556 int ret, i, j, pool_size, wl_pool_size;
557 size_t fm_pos = 0, fm_size = ubi->fm_size;
558 unsigned long long max_sqnum = 0;
559 void *fm_raw = ubi->fm_buf;
560
561 INIT_LIST_HEAD(&used);
562 INIT_LIST_HEAD(&free);
563 INIT_LIST_HEAD(&eba_orphans);
dbb7d2a8
RW		 564 ai->min_ec = UBI_MAX_ERASECOUNTER;
565
dbb7d2a8
RW		 566 fmsb = (struct ubi_fm_sb *)(fm_raw);
567 ai->max_sqnum = fmsb->sqnum;
568 fm_pos += sizeof(struct ubi_fm_sb);
569 if (fm_pos >= fm_size)
570 goto fail_bad;
571
572 fmhdr = (struct ubi_fm_hdr *)(fm_raw + fm_pos);
573 fm_pos += sizeof(*fmhdr);
574 if (fm_pos >= fm_size)
575 goto fail_bad;
576
577 if (be32_to_cpu(fmhdr->magic) != UBI_FM_HDR_MAGIC) {
32608703 578 ubi_err(ubi, "bad fastmap header magic: 0x%x, expected: 0x%x",
dbb7d2a8
RW		 579 be32_to_cpu(fmhdr->magic), UBI_FM_HDR_MAGIC);
580 goto fail_bad;
581 }
582
583 fmpl1 = (struct ubi_fm_scan_pool *)(fm_raw + fm_pos);
584 fm_pos += sizeof(*fmpl1);
585 if (fm_pos >= fm_size)
586 goto fail_bad;
587 if (be32_to_cpu(fmpl1->magic) != UBI_FM_POOL_MAGIC) {
32608703 588 ubi_err(ubi, "bad fastmap pool magic: 0x%x, expected: 0x%x",
dbb7d2a8
RW		 589 be32_to_cpu(fmpl1->magic), UBI_FM_POOL_MAGIC);
590 goto fail_bad;
591 }
592
593 fmpl2 = (struct ubi_fm_scan_pool *)(fm_raw + fm_pos);
594 fm_pos += sizeof(*fmpl2);
595 if (fm_pos >= fm_size)
596 goto fail_bad;
597 if (be32_to_cpu(fmpl2->magic) != UBI_FM_POOL_MAGIC) {
32608703 598 ubi_err(ubi, "bad fastmap pool magic: 0x%x, expected: 0x%x",
dbb7d2a8
RW		 599 be32_to_cpu(fmpl2->magic), UBI_FM_POOL_MAGIC);
600 goto fail_bad;
601 }
602
603 pool_size = be16_to_cpu(fmpl1->size);
604 wl_pool_size = be16_to_cpu(fmpl2->size);
605 fm->max_pool_size = be16_to_cpu(fmpl1->max_size);
606 fm->max_wl_pool_size = be16_to_cpu(fmpl2->max_size);
607
608 if (pool_size > UBI_FM_MAX_POOL_SIZE || pool_size < 0) {
32608703 609 ubi_err(ubi, "bad pool size: %i", pool_size);
dbb7d2a8
RW		 610 goto fail_bad;
611 }
612
613 if (wl_pool_size > UBI_FM_MAX_POOL_SIZE || wl_pool_size < 0) {
32608703 614 ubi_err(ubi, "bad WL pool size: %i", wl_pool_size);
dbb7d2a8
RW		 615 goto fail_bad;
616 }
617
618
619 if (fm->max_pool_size > UBI_FM_MAX_POOL_SIZE ||
620 fm->max_pool_size < 0) {
32608703 621 ubi_err(ubi, "bad maximal pool size: %i", fm->max_pool_size);
dbb7d2a8
RW		 622 goto fail_bad;
623 }
624
625 if (fm->max_wl_pool_size > UBI_FM_MAX_POOL_SIZE ||
626 fm->max_wl_pool_size < 0) {
32608703
TB		 627 ubi_err(ubi, "bad maximal WL pool size: %i",
628 fm->max_wl_pool_size);
dbb7d2a8
RW		 629 goto fail_bad;
630 }
631
632 /* read EC values from free list */
633 for (i = 0; i < be32_to_cpu(fmhdr->free_peb_count); i++) {
634 fmec = (struct ubi_fm_ec *)(fm_raw + fm_pos);
635 fm_pos += sizeof(*fmec);
636 if (fm_pos >= fm_size)
637 goto fail_bad;
638
639 add_aeb(ai, &ai->free, be32_to_cpu(fmec->pnum),
640 be32_to_cpu(fmec->ec), 0);
641 }
642
643 /* read EC values from used list */
644 for (i = 0; i < be32_to_cpu(fmhdr->used_peb_count); i++) {
645 fmec = (struct ubi_fm_ec *)(fm_raw + fm_pos);
646 fm_pos += sizeof(*fmec);
647 if (fm_pos >= fm_size)
648 goto fail_bad;
649
650 add_aeb(ai, &used, be32_to_cpu(fmec->pnum),
651 be32_to_cpu(fmec->ec), 0);
652 }
653
654 /* read EC values from scrub list */
655 for (i = 0; i < be32_to_cpu(fmhdr->scrub_peb_count); i++) {
656 fmec = (struct ubi_fm_ec *)(fm_raw + fm_pos);
657 fm_pos += sizeof(*fmec);
658 if (fm_pos >= fm_size)
659 goto fail_bad;
660
661 add_aeb(ai, &used, be32_to_cpu(fmec->pnum),
662 be32_to_cpu(fmec->ec), 1);
663 }
664
665 /* read EC values from erase list */
666 for (i = 0; i < be32_to_cpu(fmhdr->erase_peb_count); i++) {
667 fmec = (struct ubi_fm_ec *)(fm_raw + fm_pos);
668 fm_pos += sizeof(*fmec);
669 if (fm_pos >= fm_size)
670 goto fail_bad;
671
672 add_aeb(ai, &ai->erase, be32_to_cpu(fmec->pnum),
673 be32_to_cpu(fmec->ec), 1);
674 }
675
676 ai->mean_ec = div_u64(ai->ec_sum, ai->ec_count);
677 ai->bad_peb_count = be32_to_cpu(fmhdr->bad_peb_count);
678
679 /* Iterate over all volumes and read their EBA table */
680 for (i = 0; i < be32_to_cpu(fmhdr->vol_count); i++) {
681 fmvhdr = (struct ubi_fm_volhdr *)(fm_raw + fm_pos);
682 fm_pos += sizeof(*fmvhdr);
683 if (fm_pos >= fm_size)
684 goto fail_bad;
685
686 if (be32_to_cpu(fmvhdr->magic) != UBI_FM_VHDR_MAGIC) {
32608703 687 ubi_err(ubi, "bad fastmap vol header magic: 0x%x, expected: 0x%x",
dbb7d2a8
RW		 688 be32_to_cpu(fmvhdr->magic), UBI_FM_VHDR_MAGIC);
689 goto fail_bad;
690 }
691
692 av = add_vol(ai, be32_to_cpu(fmvhdr->vol_id),
693 be32_to_cpu(fmvhdr->used_ebs),
694 be32_to_cpu(fmvhdr->data_pad),
695 fmvhdr->vol_type,
696 be32_to_cpu(fmvhdr->last_eb_bytes));
697
698 if (!av)
699 goto fail_bad;
700
701 ai->vols_found++;
702 if (ai->highest_vol_id < be32_to_cpu(fmvhdr->vol_id))
703 ai->highest_vol_id = be32_to_cpu(fmvhdr->vol_id);
704
705 fm_eba = (struct ubi_fm_eba *)(fm_raw + fm_pos);
706 fm_pos += sizeof(*fm_eba);
707 fm_pos += (sizeof(__be32) * be32_to_cpu(fm_eba->reserved_pebs));
708 if (fm_pos >= fm_size)
709 goto fail_bad;
710
711 if (be32_to_cpu(fm_eba->magic) != UBI_FM_EBA_MAGIC) {
32608703 712 ubi_err(ubi, "bad fastmap EBA header magic: 0x%x, expected: 0x%x",
dbb7d2a8
RW		 713 be32_to_cpu(fm_eba->magic), UBI_FM_EBA_MAGIC);
714 goto fail_bad;
715 }
716
717 for (j = 0; j < be32_to_cpu(fm_eba->reserved_pebs); j++) {
718 int pnum = be32_to_cpu(fm_eba->pnum[j]);
719
720 if ((int)be32_to_cpu(fm_eba->pnum[j]) < 0)
721 continue;
722
723 aeb = NULL;
724 list_for_each_entry(tmp_aeb, &used, u.list) {
584d4623 725 if (tmp_aeb->pnum == pnum) {
dbb7d2a8 726 aeb = tmp_aeb;
584d4623
BP		 727 break;
728 }
dbb7d2a8
RW		 729 }
730
731 /* This can happen if a PEB is already in an EBA known
732 * by this fastmap but the PEB itself is not in the used
733 * list.
734 * In this case the PEB can be within the fastmap pool
735 * or while writing the fastmap it was in the protection
736 * queue.
737 */
738 if (!aeb) {
739 aeb = kmem_cache_alloc(ai->aeb_slab_cache,
740 GFP_KERNEL);
741 if (!aeb) {
742 ret = -ENOMEM;
743
744 goto fail;
745 }
746
747 aeb->lnum = j;
748 aeb->pnum = be32_to_cpu(fm_eba->pnum[j]);
749 aeb->ec = -1;
750 aeb->scrub = aeb->copy_flag = aeb->sqnum = 0;
751 list_add_tail(&aeb->u.list, &eba_orphans);
752 continue;
753 }
754
755 aeb->lnum = j;
756
757 if (av->highest_lnum <= aeb->lnum)
758 av->highest_lnum = aeb->lnum;
759
760 assign_aeb_to_av(ai, aeb, av);
761
762 dbg_bld("inserting PEB:%i (LEB %i) to vol %i",
763 aeb->pnum, aeb->lnum, av->vol_id);
764 }
765
766 ech = kzalloc(ubi->ec_hdr_alsize, GFP_KERNEL);
767 if (!ech) {
768 ret = -ENOMEM;
769 goto fail;
770 }
771
772 list_for_each_entry_safe(tmp_aeb, _tmp_aeb, &eba_orphans,
773 u.list) {
774 int err;
775
776 if (ubi_io_is_bad(ubi, tmp_aeb->pnum)) {
32608703 777 ubi_err(ubi, "bad PEB in fastmap EBA orphan list");
dbb7d2a8
RW		 778 ret = UBI_BAD_FASTMAP;
779 kfree(ech);
780 goto fail;
781 }
782
783 err = ubi_io_read_ec_hdr(ubi, tmp_aeb->pnum, ech, 0);
784 if (err && err != UBI_IO_BITFLIPS) {
32608703
TB		 785 ubi_err(ubi, "unable to read EC header! PEB:%i err:%i",
786 tmp_aeb->pnum, err);
dbb7d2a8
RW		 787 ret = err > 0 ? UBI_BAD_FASTMAP : err;
788 kfree(ech);
789
790 goto fail;
791 } else if (err == UBI_IO_BITFLIPS)
792 tmp_aeb->scrub = 1;
793
794 tmp_aeb->ec = be64_to_cpu(ech->ec);
795 assign_aeb_to_av(ai, tmp_aeb, av);
796 }
797
798 kfree(ech);
799 }
800
801 ret = scan_pool(ubi, ai, fmpl1->pebs, pool_size, &max_sqnum,
802 &eba_orphans, &free);
803 if (ret)
804 goto fail;
805
806 ret = scan_pool(ubi, ai, fmpl2->pebs, wl_pool_size, &max_sqnum,
807 &eba_orphans, &free);
808 if (ret)
809 goto fail;
810
811 if (max_sqnum > ai->max_sqnum)
812 ai->max_sqnum = max_sqnum;
813
6a059abd
WY		 814 list_for_each_entry_safe(tmp_aeb, _tmp_aeb, &free, u.list)
815 list_move_tail(&tmp_aeb->u.list, &ai->free);
dbb7d2a8 816
ae0d1469
RW		 817 ubi_assert(list_empty(&used));
818 ubi_assert(list_empty(&eba_orphans));
819 ubi_assert(list_empty(&free));
820
dbb7d2a8
RW		 821 /*
822 * If fastmap is leaking PEBs (must not happen), raise a
823 * fat warning and fall back to scanning mode.
824 * We do this here because in ubi_wl_init() it's too late
825 * and we cannot fall back to scanning.
826 */
827 if (WARN_ON(count_fastmap_pebs(ai) != ubi->peb_count -
828 ai->bad_peb_count - fm->used_blocks))
829 goto fail_bad;
830
831 return 0;
832
833fail_bad:
834 ret = UBI_BAD_FASTMAP;
835fail:
fe24c6e5 836 list_for_each_entry_safe(tmp_aeb, _tmp_aeb, &used, u.list) {
fe24c6e5 837 list_del(&tmp_aeb->u.list);
5547fec7 838 kmem_cache_free(ai->aeb_slab_cache, tmp_aeb);
fe24c6e5
RW		 839 }
840 list_for_each_entry_safe(tmp_aeb, _tmp_aeb, &eba_orphans, u.list) {
fe24c6e5 841 list_del(&tmp_aeb->u.list);
5547fec7 842 kmem_cache_free(ai->aeb_slab_cache, tmp_aeb);
fe24c6e5
RW		 843 }
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 */
862int 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
874 mutex_lock(&ubi->fm_mutex);
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);
1064out:
1065 mutex_unlock(&ubi->fm_mutex);
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
1070free_hdr:
1071 ubi_free_vid_hdr(ubi, vh);
1072 kfree(ech);
1073free_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 */
1086static 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;
1093 struct ubi_fm_scan_pool *fmpl1, *fmpl2;
1094 struct ubi_fm_ec *fec;
1095 struct ubi_fm_volhdr *fvh;
1096 struct ubi_fm_eba *feba;
1097 struct rb_node *node;
1098 struct ubi_wl_entry *wl_e;
1099 struct ubi_volume *vol;
1100 struct ubi_vid_hdr *avhdr, *dvhdr;
1101 struct ubi_work *ubi_wrk;
1102 int ret, i, j, free_peb_count, used_peb_count, vol_count;
1103 int scrub_peb_count, erase_peb_count;
1104
1105 fm_raw = ubi->fm_buf;
1106 memset(ubi->fm_buf, 0, ubi->fm_size);
1107
1108 avhdr = new_fm_vhdr(ubi, UBI_FM_SB_VOLUME_ID);
1109 if (!avhdr) {
1110 ret = -ENOMEM;
1111 goto out;
1112 }
1113
1114 dvhdr = new_fm_vhdr(ubi, UBI_FM_DATA_VOLUME_ID);
1115 if (!dvhdr) {
1116 ret = -ENOMEM;
1117 goto out_kfree;
1118 }
1119
1120 spin_lock(&ubi->volumes_lock);
1121 spin_lock(&ubi->wl_lock);
1122
1123 fmsb = (struct ubi_fm_sb *)fm_raw;
1124 fm_pos += sizeof(*fmsb);
1125 ubi_assert(fm_pos <= ubi->fm_size);
1126
1127 fmh = (struct ubi_fm_hdr *)(fm_raw + fm_pos);
1128 fm_pos += sizeof(*fmh);
1129 ubi_assert(fm_pos <= ubi->fm_size);
1130
1131 fmsb->magic = cpu_to_be32(UBI_FM_SB_MAGIC);
1132 fmsb->version = UBI_FM_FMT_VERSION;
1133 fmsb->used_blocks = cpu_to_be32(new_fm->used_blocks);
1134 /* the max sqnum will be filled in while *reading* the fastmap */
1135 fmsb->sqnum = 0;
1136
1137 fmh->magic = cpu_to_be32(UBI_FM_HDR_MAGIC);
1138 free_peb_count = 0;
1139 used_peb_count = 0;
1140 scrub_peb_count = 0;
1141 erase_peb_count = 0;
1142 vol_count = 0;
1143
1144 fmpl1 = (struct ubi_fm_scan_pool *)(fm_raw + fm_pos);
1145 fm_pos += sizeof(*fmpl1);
1146 fmpl1->magic = cpu_to_be32(UBI_FM_POOL_MAGIC);
1147 fmpl1->size = cpu_to_be16(ubi->fm_pool.size);
1148 fmpl1->max_size = cpu_to_be16(ubi->fm_pool.max_size);
1149
1150 for (i = 0; i < ubi->fm_pool.size; i++)
1151 fmpl1->pebs[i] = cpu_to_be32(ubi->fm_pool.pebs[i]);
1152
1153 fmpl2 = (struct ubi_fm_scan_pool *)(fm_raw + fm_pos);
1154 fm_pos += sizeof(*fmpl2);
1155 fmpl2->magic = cpu_to_be32(UBI_FM_POOL_MAGIC);
1156 fmpl2->size = cpu_to_be16(ubi->fm_wl_pool.size);
1157 fmpl2->max_size = cpu_to_be16(ubi->fm_wl_pool.max_size);
1158
1159 for (i = 0; i < ubi->fm_wl_pool.size; i++)
1160 fmpl2->pebs[i] = cpu_to_be32(ubi->fm_wl_pool.pebs[i]);
1161
1162 for (node = rb_first(&ubi->free); node; node = rb_next(node)) {
1163 wl_e = rb_entry(node, struct ubi_wl_entry, u.rb);
1164 fec = (struct ubi_fm_ec *)(fm_raw + fm_pos);
1165
1166 fec->pnum = cpu_to_be32(wl_e->pnum);
1167 fec->ec = cpu_to_be32(wl_e->ec);
1168
1169 free_peb_count++;
1170 fm_pos += sizeof(*fec);
1171 ubi_assert(fm_pos <= ubi->fm_size);
1172 }
1173 fmh->free_peb_count = cpu_to_be32(free_peb_count);
1174
1175 for (node = rb_first(&ubi->used); node; node = rb_next(node)) {
1176 wl_e = rb_entry(node, struct ubi_wl_entry, u.rb);
1177 fec = (struct ubi_fm_ec *)(fm_raw + fm_pos);
1178
1179 fec->pnum = cpu_to_be32(wl_e->pnum);
1180 fec->ec = cpu_to_be32(wl_e->ec);
1181
1182 used_peb_count++;
1183 fm_pos += sizeof(*fec);
1184 ubi_assert(fm_pos <= ubi->fm_size);
1185 }
4f5e3b6f
RW		 1186
1187 for (i = 0; i < UBI_PROT_QUEUE_LEN; i++) {
1188 list_for_each_entry(wl_e, &ubi->pq[i], u.list) {
1189 fec = (struct ubi_fm_ec *)(fm_raw + fm_pos);
1190
1191 fec->pnum = cpu_to_be32(wl_e->pnum);
1192 fec->ec = cpu_to_be32(wl_e->ec);
1193
1194 used_peb_count++;
1195 fm_pos += sizeof(*fec);
1196 ubi_assert(fm_pos <= ubi->fm_size);
1197 }
1198 }
dbb7d2a8
RW		 1199 fmh->used_peb_count = cpu_to_be32(used_peb_count);
1200
1201 for (node = rb_first(&ubi->scrub); node; node = rb_next(node)) {
1202 wl_e = rb_entry(node, struct ubi_wl_entry, u.rb);
1203 fec = (struct ubi_fm_ec *)(fm_raw + fm_pos);
1204
1205 fec->pnum = cpu_to_be32(wl_e->pnum);
1206 fec->ec = cpu_to_be32(wl_e->ec);
1207
1208 scrub_peb_count++;
1209 fm_pos += sizeof(*fec);
1210 ubi_assert(fm_pos <= ubi->fm_size);
1211 }
1212 fmh->scrub_peb_count = cpu_to_be32(scrub_peb_count);
1213
1214
1215 list_for_each_entry(ubi_wrk, &ubi->works, list) {
1216 if (ubi_is_erase_work(ubi_wrk)) {
1217 wl_e = ubi_wrk->e;
1218 ubi_assert(wl_e);
1219
1220 fec = (struct ubi_fm_ec *)(fm_raw + fm_pos);
1221
1222 fec->pnum = cpu_to_be32(wl_e->pnum);
1223 fec->ec = cpu_to_be32(wl_e->ec);
1224
1225 erase_peb_count++;
1226 fm_pos += sizeof(*fec);
1227 ubi_assert(fm_pos <= ubi->fm_size);
1228 }
1229 }
1230 fmh->erase_peb_count = cpu_to_be32(erase_peb_count);
1231
1232 for (i = 0; i < UBI_MAX_VOLUMES + UBI_INT_VOL_COUNT; i++) {
1233 vol = ubi->volumes[i];
1234
1235 if (!vol)
1236 continue;
1237
1238 vol_count++;
1239
1240 fvh = (struct ubi_fm_volhdr *)(fm_raw + fm_pos);
1241 fm_pos += sizeof(*fvh);
1242 ubi_assert(fm_pos <= ubi->fm_size);
1243
1244 fvh->magic = cpu_to_be32(UBI_FM_VHDR_MAGIC);
1245 fvh->vol_id = cpu_to_be32(vol->vol_id);
1246 fvh->vol_type = vol->vol_type;
1247 fvh->used_ebs = cpu_to_be32(vol->used_ebs);
1248 fvh->data_pad = cpu_to_be32(vol->data_pad);
1249 fvh->last_eb_bytes = cpu_to_be32(vol->last_eb_bytes);
1250
1251 ubi_assert(vol->vol_type == UBI_DYNAMIC_VOLUME ||
1252 vol->vol_type == UBI_STATIC_VOLUME);
1253
1254 feba = (struct ubi_fm_eba *)(fm_raw + fm_pos);
1255 fm_pos += sizeof(*feba) + (sizeof(__be32) * vol->reserved_pebs);
1256 ubi_assert(fm_pos <= ubi->fm_size);
1257
1258 for (j = 0; j < vol->reserved_pebs; j++)
1259 feba->pnum[j] = cpu_to_be32(vol->eba_tbl[j]);
1260
1261 feba->reserved_pebs = cpu_to_be32(j);
1262 feba->magic = cpu_to_be32(UBI_FM_EBA_MAGIC);
1263 }
1264 fmh->vol_count = cpu_to_be32(vol_count);
1265 fmh->bad_peb_count = cpu_to_be32(ubi->bad_peb_count);
1266
1267 avhdr->sqnum = cpu_to_be64(ubi_next_sqnum(ubi));
1268 avhdr->lnum = 0;
1269
1270 spin_unlock(&ubi->wl_lock);
1271 spin_unlock(&ubi->volumes_lock);
1272
1273 dbg_bld("writing fastmap SB to PEB %i", new_fm->e[0]->pnum);
1274 ret = ubi_io_write_vid_hdr(ubi, new_fm->e[0]->pnum, avhdr);
1275 if (ret) {
32608703 1276 ubi_err(ubi, "unable to write vid_hdr to fastmap SB!");
dbb7d2a8
RW		 1277 goto out_kfree;
1278 }
1279
1280 for (i = 0; i < new_fm->used_blocks; i++) {
1281 fmsb->block_loc[i] = cpu_to_be32(new_fm->e[i]->pnum);
1282 fmsb->block_ec[i] = cpu_to_be32(new_fm->e[i]->ec);
1283 }
1284
1285 fmsb->data_crc = 0;
1286 fmsb->data_crc = cpu_to_be32(crc32(UBI_CRC32_INIT, fm_raw,
1287 ubi->fm_size));
1288
1289 for (i = 1; i < new_fm->used_blocks; i++) {
1290 dvhdr->sqnum = cpu_to_be64(ubi_next_sqnum(ubi));
1291 dvhdr->lnum = cpu_to_be32(i);
1292 dbg_bld("writing fastmap data to PEB %i sqnum %llu",
1293 new_fm->e[i]->pnum, be64_to_cpu(dvhdr->sqnum));
1294 ret = ubi_io_write_vid_hdr(ubi, new_fm->e[i]->pnum, dvhdr);
1295 if (ret) {
32608703 1296 ubi_err(ubi, "unable to write vid_hdr to PEB %i!",
dbb7d2a8
RW		 1297 new_fm->e[i]->pnum);
1298 goto out_kfree;
1299 }
1300 }
1301
1302 for (i = 0; i < new_fm->used_blocks; i++) {
1303 ret = ubi_io_write(ubi, fm_raw + (i * ubi->leb_size),
1304 new_fm->e[i]->pnum, ubi->leb_start, ubi->leb_size);
1305 if (ret) {
32608703 1306 ubi_err(ubi, "unable to write fastmap to PEB %i!",
dbb7d2a8
RW		 1307 new_fm->e[i]->pnum);
1308 goto out_kfree;
1309 }
1310 }
1311
1312 ubi_assert(new_fm);
1313 ubi->fm = new_fm;
1314
1315 dbg_bld("fastmap written!");
1316
1317out_kfree:
1318 ubi_free_vid_hdr(ubi, avhdr);
1319 ubi_free_vid_hdr(ubi, dvhdr);
1320out:
1321 return ret;
1322}
1323
1324/**
1325 * erase_block - Manually erase a PEB.
1326 * @ubi: UBI device object
1327 * @pnum: PEB to be erased
1328 *
1329 * Returns the new EC value on success, < 0 indicates an internal error.
1330 */
1331static int erase_block(struct ubi_device *ubi, int pnum)
1332{
1333 int ret;
1334 struct ubi_ec_hdr *ec_hdr;
1335 long long ec;
1336
1337 ec_hdr = kzalloc(ubi->ec_hdr_alsize, GFP_KERNEL);
1338 if (!ec_hdr)
1339 return -ENOMEM;
1340
1341 ret = ubi_io_read_ec_hdr(ubi, pnum, ec_hdr, 0);
1342 if (ret < 0)
1343 goto out;
1344 else if (ret && ret != UBI_IO_BITFLIPS) {
1345 ret = -EINVAL;
1346 goto out;
1347 }
1348
1349 ret = ubi_io_sync_erase(ubi, pnum, 0);
1350 if (ret < 0)
1351 goto out;
1352
1353 ec = be64_to_cpu(ec_hdr->ec);
1354 ec += ret;
1355 if (ec > UBI_MAX_ERASECOUNTER) {
1356 ret = -EINVAL;
1357 goto out;
1358 }
1359
1360 ec_hdr->ec = cpu_to_be64(ec);
1361 ret = ubi_io_write_ec_hdr(ubi, pnum, ec_hdr);
1362 if (ret < 0)
1363 goto out;
1364
1365 ret = ec;
1366out:
1367 kfree(ec_hdr);
1368 return ret;
1369}
1370
1371/**
1372 * invalidate_fastmap - destroys a fastmap.
1373 * @ubi: UBI device object
1374 * @fm: the fastmap to be destroyed
1375 *
1376 * Returns 0 on success, < 0 indicates an internal error.
1377 */
1378static int invalidate_fastmap(struct ubi_device *ubi,
1379 struct ubi_fastmap_layout *fm)
1380{
8930fa50 1381 int ret;
dbb7d2a8
RW		 1382 struct ubi_vid_hdr *vh;
1383
1384 ret = erase_block(ubi, fm->e[0]->pnum);
1385 if (ret < 0)
1386 return ret;
1387
1388 vh = new_fm_vhdr(ubi, UBI_FM_SB_VOLUME_ID);
1389 if (!vh)
1390 return -ENOMEM;
1391
1392 /* deleting the current fastmap SB is not enough, an old SB may exist,
1393 * so create a (corrupted) SB such that fastmap will find it and fall
1394 * back to scanning mode in any case */
1395 vh->sqnum = cpu_to_be64(ubi_next_sqnum(ubi));
1396 ret = ubi_io_write_vid_hdr(ubi, fm->e[0]->pnum, vh);
1397
dbb7d2a8
RW		 1398 return ret;
1399}
1400
1401/**
1402 * ubi_update_fastmap - will be called by UBI if a volume changes or
1403 * a fastmap pool becomes full.
1404 * @ubi: UBI device object
1405 *
1406 * Returns 0 on success, < 0 indicates an internal error.
1407 */
1408int ubi_update_fastmap(struct ubi_device *ubi)
1409{
1410 int ret, i;
1411 struct ubi_fastmap_layout *new_fm, *old_fm;
1412 struct ubi_wl_entry *tmp_e;
1413
1414 mutex_lock(&ubi->fm_mutex);
1415
1416 ubi_refill_pools(ubi);
1417
1418 if (ubi->ro_mode || ubi->fm_disabled) {
1419 mutex_unlock(&ubi->fm_mutex);
1420 return 0;
1421 }
1422
1423 ret = ubi_ensure_anchor_pebs(ubi);
1424 if (ret) {
1425 mutex_unlock(&ubi->fm_mutex);
1426 return ret;
1427 }
1428
1429 new_fm = kzalloc(sizeof(*new_fm), GFP_KERNEL);
1430 if (!new_fm) {
1431 mutex_unlock(&ubi->fm_mutex);
1432 return -ENOMEM;
1433 }
1434
1435 new_fm->used_blocks = ubi->fm_size / ubi->leb_size;
dbb7d2a8
RW		 1436 old_fm = ubi->fm;
1437 ubi->fm = NULL;
1438
1439 if (new_fm->used_blocks > UBI_FM_MAX_BLOCKS) {
32608703 1440 ubi_err(ubi, "fastmap too large");
dbb7d2a8
RW		 1441 ret = -ENOSPC;
1442 goto err;
1443 }
1444
1445 for (i = 1; i < new_fm->used_blocks; i++) {
1446 spin_lock(&ubi->wl_lock);
1447 tmp_e = ubi_wl_get_fm_peb(ubi, 0);
1448 spin_unlock(&ubi->wl_lock);
1449
1450 if (!tmp_e && !old_fm) {
1451 int j;
32608703 1452 ubi_err(ubi, "could not get any free erase block");
dbb7d2a8
RW		 1453
1454 for (j = 1; j < i; j++)
1455 ubi_wl_put_fm_peb(ubi, new_fm->e[j], j, 0);
1456
1457 ret = -ENOSPC;
1458 goto err;
1459 } else if (!tmp_e && old_fm) {
1460 ret = erase_block(ubi, old_fm->e[i]->pnum);
1461 if (ret < 0) {
1462 int j;
1463
1464 for (j = 1; j < i; j++)
1465 ubi_wl_put_fm_peb(ubi, new_fm->e[j],
1466 j, 0);
1467
32608703 1468 ubi_err(ubi, "could not erase old fastmap PEB");
dbb7d2a8
RW		 1469 goto err;
1470 }
c4ca6be9 1471 new_fm->e[i] = old_fm->e[i];
dbb7d2a8 1472 } else {
c4ca6be9 1473 new_fm->e[i] = tmp_e;
dbb7d2a8
RW		 1474
1475 if (old_fm)
1476 ubi_wl_put_fm_peb(ubi, old_fm->e[i], i,
1477 old_fm->to_be_tortured[i]);
1478 }
1479 }
1480
1481 spin_lock(&ubi->wl_lock);
1482 tmp_e = ubi_wl_get_fm_peb(ubi, 1);
1483 spin_unlock(&ubi->wl_lock);
1484
1485 if (old_fm) {
1486 /* no fresh anchor PEB was found, reuse the old one */
1487 if (!tmp_e) {
1488 ret = erase_block(ubi, old_fm->e[0]->pnum);
1489 if (ret < 0) {
1490 int i;
32608703 1491 ubi_err(ubi, "could not erase old anchor PEB");
dbb7d2a8
RW		 1492
1493 for (i = 1; i < new_fm->used_blocks; i++)
1494 ubi_wl_put_fm_peb(ubi, new_fm->e[i],
1495 i, 0);
1496 goto err;
1497 }
c4ca6be9 1498 new_fm->e[0] = old_fm->e[0];
dbb7d2a8
RW		 1499 new_fm->e[0]->ec = ret;
1500 } else {
1501 /* we've got a new anchor PEB, return the old one */
1502 ubi_wl_put_fm_peb(ubi, old_fm->e[0], 0,
1503 old_fm->to_be_tortured[0]);
c4ca6be9 1504 new_fm->e[0] = tmp_e;
dbb7d2a8
RW		 1505 }
1506 } else {
1507 if (!tmp_e) {
1508 int i;
32608703 1509 ubi_err(ubi, "could not find any anchor PEB");
dbb7d2a8
RW		 1510
1511 for (i = 1; i < new_fm->used_blocks; i++)
1512 ubi_wl_put_fm_peb(ubi, new_fm->e[i], i, 0);
1513
1514 ret = -ENOSPC;
1515 goto err;
1516 }
c4ca6be9 1517 new_fm->e[0] = tmp_e;
dbb7d2a8
RW		 1518 }
1519
1520 down_write(&ubi->work_sem);
1521 down_write(&ubi->fm_sem);
1522 ret = ubi_write_fastmap(ubi, new_fm);
1523 up_write(&ubi->fm_sem);
1524 up_write(&ubi->work_sem);
1525
1526 if (ret)
1527 goto err;
1528
1529out_unlock:
1530 mutex_unlock(&ubi->fm_mutex);
1531 kfree(old_fm);
1532 return ret;
1533
1534err:
1535 kfree(new_fm);
1536
32608703 1537 ubi_warn(ubi, "Unable to write new fastmap, err=%i", ret);
dbb7d2a8
RW		 1538
1539 ret = 0;
1540 if (old_fm) {
1541 ret = invalidate_fastmap(ubi, old_fm);
1542 if (ret < 0)
32608703 1543 ubi_err(ubi, "Unable to invalidiate current fastmap!");
dbb7d2a8
RW		 1544 else if (ret)
1545 ret = 0;
1546 }
1547 goto out_unlock;
1548}
Ubuntu Artful kernel mirror