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UBI: Fastmap: Make ubi_refill_pools() fair
[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);
564 INIT_LIST_HEAD(&ai->corr);
565 INIT_LIST_HEAD(&ai->free);
566 INIT_LIST_HEAD(&ai->erase);
567 INIT_LIST_HEAD(&ai->alien);
568 ai->volumes = RB_ROOT;
569 ai->min_ec = UBI_MAX_ERASECOUNTER;
570
571 ai->aeb_slab_cache = kmem_cache_create("ubi_ainf_peb_slab",
572 sizeof(struct ubi_ainf_peb),
573 0, 0, NULL);
574 if (!ai->aeb_slab_cache) {
575 ret = -ENOMEM;
576 goto fail;
577 }
578
579 fmsb = (struct ubi_fm_sb *)(fm_raw);
580 ai->max_sqnum = fmsb->sqnum;
581 fm_pos += sizeof(struct ubi_fm_sb);
582 if (fm_pos >= fm_size)
583 goto fail_bad;
584
585 fmhdr = (struct ubi_fm_hdr *)(fm_raw + fm_pos);
586 fm_pos += sizeof(*fmhdr);
587 if (fm_pos >= fm_size)
588 goto fail_bad;
589
590 if (be32_to_cpu(fmhdr->magic) != UBI_FM_HDR_MAGIC) {
32608703 591 ubi_err(ubi, "bad fastmap header magic: 0x%x, expected: 0x%x",
dbb7d2a8
RW		 592 be32_to_cpu(fmhdr->magic), UBI_FM_HDR_MAGIC);
593 goto fail_bad;
594 }
595
596 fmpl1 = (struct ubi_fm_scan_pool *)(fm_raw + fm_pos);
597 fm_pos += sizeof(*fmpl1);
598 if (fm_pos >= fm_size)
599 goto fail_bad;
600 if (be32_to_cpu(fmpl1->magic) != UBI_FM_POOL_MAGIC) {
32608703 601 ubi_err(ubi, "bad fastmap pool magic: 0x%x, expected: 0x%x",
dbb7d2a8
RW		 602 be32_to_cpu(fmpl1->magic), UBI_FM_POOL_MAGIC);
603 goto fail_bad;
604 }
605
606 fmpl2 = (struct ubi_fm_scan_pool *)(fm_raw + fm_pos);
607 fm_pos += sizeof(*fmpl2);
608 if (fm_pos >= fm_size)
609 goto fail_bad;
610 if (be32_to_cpu(fmpl2->magic) != UBI_FM_POOL_MAGIC) {
32608703 611 ubi_err(ubi, "bad fastmap pool magic: 0x%x, expected: 0x%x",
dbb7d2a8
RW		 612 be32_to_cpu(fmpl2->magic), UBI_FM_POOL_MAGIC);
613 goto fail_bad;
614 }
615
616 pool_size = be16_to_cpu(fmpl1->size);
617 wl_pool_size = be16_to_cpu(fmpl2->size);
618 fm->max_pool_size = be16_to_cpu(fmpl1->max_size);
619 fm->max_wl_pool_size = be16_to_cpu(fmpl2->max_size);
620
621 if (pool_size > UBI_FM_MAX_POOL_SIZE || pool_size < 0) {
32608703 622 ubi_err(ubi, "bad pool size: %i", pool_size);
dbb7d2a8
RW		 623 goto fail_bad;
624 }
625
626 if (wl_pool_size > UBI_FM_MAX_POOL_SIZE || wl_pool_size < 0) {
32608703 627 ubi_err(ubi, "bad WL pool size: %i", wl_pool_size);
dbb7d2a8
RW		 628 goto fail_bad;
629 }
630
631
632 if (fm->max_pool_size > UBI_FM_MAX_POOL_SIZE ||
633 fm->max_pool_size < 0) {
32608703 634 ubi_err(ubi, "bad maximal pool size: %i", fm->max_pool_size);
dbb7d2a8
RW		 635 goto fail_bad;
636 }
637
638 if (fm->max_wl_pool_size > UBI_FM_MAX_POOL_SIZE ||
639 fm->max_wl_pool_size < 0) {
32608703
TB		 640 ubi_err(ubi, "bad maximal WL pool size: %i",
641 fm->max_wl_pool_size);
dbb7d2a8
RW		 642 goto fail_bad;
643 }
644
645 /* read EC values from free list */
646 for (i = 0; i < be32_to_cpu(fmhdr->free_peb_count); i++) {
647 fmec = (struct ubi_fm_ec *)(fm_raw + fm_pos);
648 fm_pos += sizeof(*fmec);
649 if (fm_pos >= fm_size)
650 goto fail_bad;
651
652 add_aeb(ai, &ai->free, be32_to_cpu(fmec->pnum),
653 be32_to_cpu(fmec->ec), 0);
654 }
655
656 /* read EC values from used list */
657 for (i = 0; i < be32_to_cpu(fmhdr->used_peb_count); i++) {
658 fmec = (struct ubi_fm_ec *)(fm_raw + fm_pos);
659 fm_pos += sizeof(*fmec);
660 if (fm_pos >= fm_size)
661 goto fail_bad;
662
663 add_aeb(ai, &used, be32_to_cpu(fmec->pnum),
664 be32_to_cpu(fmec->ec), 0);
665 }
666
667 /* read EC values from scrub list */
668 for (i = 0; i < be32_to_cpu(fmhdr->scrub_peb_count); i++) {
669 fmec = (struct ubi_fm_ec *)(fm_raw + fm_pos);
670 fm_pos += sizeof(*fmec);
671 if (fm_pos >= fm_size)
672 goto fail_bad;
673
674 add_aeb(ai, &used, be32_to_cpu(fmec->pnum),
675 be32_to_cpu(fmec->ec), 1);
676 }
677
678 /* read EC values from erase list */
679 for (i = 0; i < be32_to_cpu(fmhdr->erase_peb_count); i++) {
680 fmec = (struct ubi_fm_ec *)(fm_raw + fm_pos);
681 fm_pos += sizeof(*fmec);
682 if (fm_pos >= fm_size)
683 goto fail_bad;
684
685 add_aeb(ai, &ai->erase, be32_to_cpu(fmec->pnum),
686 be32_to_cpu(fmec->ec), 1);
687 }
688
689 ai->mean_ec = div_u64(ai->ec_sum, ai->ec_count);
690 ai->bad_peb_count = be32_to_cpu(fmhdr->bad_peb_count);
691
692 /* Iterate over all volumes and read their EBA table */
693 for (i = 0; i < be32_to_cpu(fmhdr->vol_count); i++) {
694 fmvhdr = (struct ubi_fm_volhdr *)(fm_raw + fm_pos);
695 fm_pos += sizeof(*fmvhdr);
696 if (fm_pos >= fm_size)
697 goto fail_bad;
698
699 if (be32_to_cpu(fmvhdr->magic) != UBI_FM_VHDR_MAGIC) {
32608703 700 ubi_err(ubi, "bad fastmap vol header magic: 0x%x, expected: 0x%x",
dbb7d2a8
RW		 701 be32_to_cpu(fmvhdr->magic), UBI_FM_VHDR_MAGIC);
702 goto fail_bad;
703 }
704
705 av = add_vol(ai, be32_to_cpu(fmvhdr->vol_id),
706 be32_to_cpu(fmvhdr->used_ebs),
707 be32_to_cpu(fmvhdr->data_pad),
708 fmvhdr->vol_type,
709 be32_to_cpu(fmvhdr->last_eb_bytes));
710
711 if (!av)
712 goto fail_bad;
713
714 ai->vols_found++;
715 if (ai->highest_vol_id < be32_to_cpu(fmvhdr->vol_id))
716 ai->highest_vol_id = be32_to_cpu(fmvhdr->vol_id);
717
718 fm_eba = (struct ubi_fm_eba *)(fm_raw + fm_pos);
719 fm_pos += sizeof(*fm_eba);
720 fm_pos += (sizeof(__be32) * be32_to_cpu(fm_eba->reserved_pebs));
721 if (fm_pos >= fm_size)
722 goto fail_bad;
723
724 if (be32_to_cpu(fm_eba->magic) != UBI_FM_EBA_MAGIC) {
32608703 725 ubi_err(ubi, "bad fastmap EBA header magic: 0x%x, expected: 0x%x",
dbb7d2a8
RW		 726 be32_to_cpu(fm_eba->magic), UBI_FM_EBA_MAGIC);
727 goto fail_bad;
728 }
729
730 for (j = 0; j < be32_to_cpu(fm_eba->reserved_pebs); j++) {
731 int pnum = be32_to_cpu(fm_eba->pnum[j]);
732
733 if ((int)be32_to_cpu(fm_eba->pnum[j]) < 0)
734 continue;
735
736 aeb = NULL;
737 list_for_each_entry(tmp_aeb, &used, u.list) {
584d4623 738 if (tmp_aeb->pnum == pnum) {
dbb7d2a8 739 aeb = tmp_aeb;
584d4623
BP		 740 break;
741 }
dbb7d2a8
RW		 742 }
743
744 /* This can happen if a PEB is already in an EBA known
745 * by this fastmap but the PEB itself is not in the used
746 * list.
747 * In this case the PEB can be within the fastmap pool
748 * or while writing the fastmap it was in the protection
749 * queue.
750 */
751 if (!aeb) {
752 aeb = kmem_cache_alloc(ai->aeb_slab_cache,
753 GFP_KERNEL);
754 if (!aeb) {
755 ret = -ENOMEM;
756
757 goto fail;
758 }
759
760 aeb->lnum = j;
761 aeb->pnum = be32_to_cpu(fm_eba->pnum[j]);
762 aeb->ec = -1;
763 aeb->scrub = aeb->copy_flag = aeb->sqnum = 0;
764 list_add_tail(&aeb->u.list, &eba_orphans);
765 continue;
766 }
767
768 aeb->lnum = j;
769
770 if (av->highest_lnum <= aeb->lnum)
771 av->highest_lnum = aeb->lnum;
772
773 assign_aeb_to_av(ai, aeb, av);
774
775 dbg_bld("inserting PEB:%i (LEB %i) to vol %i",
776 aeb->pnum, aeb->lnum, av->vol_id);
777 }
778
779 ech = kzalloc(ubi->ec_hdr_alsize, GFP_KERNEL);
780 if (!ech) {
781 ret = -ENOMEM;
782 goto fail;
783 }
784
785 list_for_each_entry_safe(tmp_aeb, _tmp_aeb, &eba_orphans,
786 u.list) {
787 int err;
788
789 if (ubi_io_is_bad(ubi, tmp_aeb->pnum)) {
32608703 790 ubi_err(ubi, "bad PEB in fastmap EBA orphan list");
dbb7d2a8
RW		 791 ret = UBI_BAD_FASTMAP;
792 kfree(ech);
793 goto fail;
794 }
795
796 err = ubi_io_read_ec_hdr(ubi, tmp_aeb->pnum, ech, 0);
797 if (err && err != UBI_IO_BITFLIPS) {
32608703
TB		 798 ubi_err(ubi, "unable to read EC header! PEB:%i err:%i",
799 tmp_aeb->pnum, err);
dbb7d2a8
RW		 800 ret = err > 0 ? UBI_BAD_FASTMAP : err;
801 kfree(ech);
802
803 goto fail;
804 } else if (err == UBI_IO_BITFLIPS)
805 tmp_aeb->scrub = 1;
806
807 tmp_aeb->ec = be64_to_cpu(ech->ec);
808 assign_aeb_to_av(ai, tmp_aeb, av);
809 }
810
811 kfree(ech);
812 }
813
814 ret = scan_pool(ubi, ai, fmpl1->pebs, pool_size, &max_sqnum,
815 &eba_orphans, &free);
816 if (ret)
817 goto fail;
818
819 ret = scan_pool(ubi, ai, fmpl2->pebs, wl_pool_size, &max_sqnum,
820 &eba_orphans, &free);
821 if (ret)
822 goto fail;
823
824 if (max_sqnum > ai->max_sqnum)
825 ai->max_sqnum = max_sqnum;
826
6a059abd
WY		 827 list_for_each_entry_safe(tmp_aeb, _tmp_aeb, &free, u.list)
828 list_move_tail(&tmp_aeb->u.list, &ai->free);
dbb7d2a8 829
ae0d1469
RW		 830 ubi_assert(list_empty(&used));
831 ubi_assert(list_empty(&eba_orphans));
832 ubi_assert(list_empty(&free));
833
dbb7d2a8
RW		 834 /*
835 * If fastmap is leaking PEBs (must not happen), raise a
836 * fat warning and fall back to scanning mode.
837 * We do this here because in ubi_wl_init() it's too late
838 * and we cannot fall back to scanning.
839 */
840 if (WARN_ON(count_fastmap_pebs(ai) != ubi->peb_count -
841 ai->bad_peb_count - fm->used_blocks))
842 goto fail_bad;
843
844 return 0;
845
846fail_bad:
847 ret = UBI_BAD_FASTMAP;
848fail:
fe24c6e5 849 list_for_each_entry_safe(tmp_aeb, _tmp_aeb, &used, u.list) {
fe24c6e5 850 list_del(&tmp_aeb->u.list);
5547fec7 851 kmem_cache_free(ai->aeb_slab_cache, tmp_aeb);
fe24c6e5
RW		 852 }
853 list_for_each_entry_safe(tmp_aeb, _tmp_aeb, &eba_orphans, u.list) {
fe24c6e5 854 list_del(&tmp_aeb->u.list);
5547fec7 855 kmem_cache_free(ai->aeb_slab_cache, tmp_aeb);
fe24c6e5
RW		 856 }
857 list_for_each_entry_safe(tmp_aeb, _tmp_aeb, &free, u.list) {
fe24c6e5 858 list_del(&tmp_aeb->u.list);
5547fec7 859 kmem_cache_free(ai->aeb_slab_cache, tmp_aeb);
fe24c6e5
RW		 860 }
861
dbb7d2a8
RW		 862 return ret;
863}
864
865/**
866 * ubi_scan_fastmap - scan the fastmap.
867 * @ubi: UBI device object
868 * @ai: UBI attach info to be filled
869 * @fm_anchor: The fastmap starts at this PEB
870 *
871 * Returns 0 on success, UBI_NO_FASTMAP if no fastmap was found,
872 * UBI_BAD_FASTMAP if one was found but is not usable.
873 * < 0 indicates an internal error.
874 */
875int ubi_scan_fastmap(struct ubi_device *ubi, struct ubi_attach_info *ai,
876 int fm_anchor)
877{
878 struct ubi_fm_sb *fmsb, *fmsb2;
879 struct ubi_vid_hdr *vh;
880 struct ubi_ec_hdr *ech;
881 struct ubi_fastmap_layout *fm;
882 int i, used_blocks, pnum, ret = 0;
883 size_t fm_size;
884 __be32 crc, tmp_crc;
885 unsigned long long sqnum = 0;
886
887 mutex_lock(&ubi->fm_mutex);
888 memset(ubi->fm_buf, 0, ubi->fm_size);
889
890 fmsb = kmalloc(sizeof(*fmsb), GFP_KERNEL);
891 if (!fmsb) {
892 ret = -ENOMEM;
893 goto out;
894 }
895
896 fm = kzalloc(sizeof(*fm), GFP_KERNEL);
897 if (!fm) {
898 ret = -ENOMEM;
899 kfree(fmsb);
900 goto out;
901 }
902
903 ret = ubi_io_read(ubi, fmsb, fm_anchor, ubi->leb_start, sizeof(*fmsb));
904 if (ret && ret != UBI_IO_BITFLIPS)
905 goto free_fm_sb;
906 else if (ret == UBI_IO_BITFLIPS)
907 fm->to_be_tortured[0] = 1;
908
909 if (be32_to_cpu(fmsb->magic) != UBI_FM_SB_MAGIC) {
32608703 910 ubi_err(ubi, "bad super block magic: 0x%x, expected: 0x%x",
dbb7d2a8
RW		 911 be32_to_cpu(fmsb->magic), UBI_FM_SB_MAGIC);
912 ret = UBI_BAD_FASTMAP;
913 goto free_fm_sb;
914 }
915
916 if (fmsb->version != UBI_FM_FMT_VERSION) {
32608703 917 ubi_err(ubi, "bad fastmap version: %i, expected: %i",
dbb7d2a8
RW		 918 fmsb->version, UBI_FM_FMT_VERSION);
919 ret = UBI_BAD_FASTMAP;
920 goto free_fm_sb;
921 }
922
923 used_blocks = be32_to_cpu(fmsb->used_blocks);
924 if (used_blocks > UBI_FM_MAX_BLOCKS || used_blocks < 1) {
32608703
TB		 925 ubi_err(ubi, "number of fastmap blocks is invalid: %i",
926 used_blocks);
dbb7d2a8
RW		 927 ret = UBI_BAD_FASTMAP;
928 goto free_fm_sb;
929 }
930
931 fm_size = ubi->leb_size * used_blocks;
932 if (fm_size != ubi->fm_size) {
32608703
TB		 933 ubi_err(ubi, "bad fastmap size: %zi, expected: %zi",
934 fm_size, ubi->fm_size);
dbb7d2a8
RW		 935 ret = UBI_BAD_FASTMAP;
936 goto free_fm_sb;
937 }
938
939 ech = kzalloc(ubi->ec_hdr_alsize, GFP_KERNEL);
940 if (!ech) {
941 ret = -ENOMEM;
942 goto free_fm_sb;
943 }
944
945 vh = ubi_zalloc_vid_hdr(ubi, GFP_KERNEL);
946 if (!vh) {
947 ret = -ENOMEM;
948 goto free_hdr;
949 }
950
951 for (i = 0; i < used_blocks; i++) {
c22301ad
RG		 952 int image_seq;
953
dbb7d2a8
RW		 954 pnum = be32_to_cpu(fmsb->block_loc[i]);
955
956 if (ubi_io_is_bad(ubi, pnum)) {
957 ret = UBI_BAD_FASTMAP;
958 goto free_hdr;
959 }
960
961 ret = ubi_io_read_ec_hdr(ubi, pnum, ech, 0);
962 if (ret && ret != UBI_IO_BITFLIPS) {
32608703 963 ubi_err(ubi, "unable to read fastmap block# %i EC (PEB: %i)",
dbb7d2a8
RW		 964 i, pnum);
965 if (ret > 0)
966 ret = UBI_BAD_FASTMAP;
967 goto free_hdr;
968 } else if (ret == UBI_IO_BITFLIPS)
969 fm->to_be_tortured[i] = 1;
970
c22301ad 971 image_seq = be32_to_cpu(ech->image_seq);
dbb7d2a8 972 if (!ubi->image_seq)
c22301ad 973 ubi->image_seq = image_seq;
dbb7d2a8 974
c22301ad
RG		 975 /*
976 * Older UBI implementations have image_seq set to zero, so
977 * we shouldn't fail if image_seq == 0.
978 */
979 if (image_seq && (image_seq != ubi->image_seq)) {
32608703 980 ubi_err(ubi, "wrong image seq:%d instead of %d",
c22301ad 981 be32_to_cpu(ech->image_seq), ubi->image_seq);
dbb7d2a8
RW		 982 ret = UBI_BAD_FASTMAP;
983 goto free_hdr;
984 }
985
986 ret = ubi_io_read_vid_hdr(ubi, pnum, vh, 0);
987 if (ret && ret != UBI_IO_BITFLIPS) {
32608703 988 ubi_err(ubi, "unable to read fastmap block# %i (PEB: %i)",
dbb7d2a8
RW		 989 i, pnum);
990 goto free_hdr;
991 }
992
993 if (i == 0) {
994 if (be32_to_cpu(vh->vol_id) != UBI_FM_SB_VOLUME_ID) {
32608703 995 ubi_err(ubi, "bad fastmap anchor vol_id: 0x%x, expected: 0x%x",
dbb7d2a8
RW		 996 be32_to_cpu(vh->vol_id),
997 UBI_FM_SB_VOLUME_ID);
998 ret = UBI_BAD_FASTMAP;
999 goto free_hdr;
1000 }
1001 } else {
1002 if (be32_to_cpu(vh->vol_id) != UBI_FM_DATA_VOLUME_ID) {
32608703 1003 ubi_err(ubi, "bad fastmap data vol_id: 0x%x, expected: 0x%x",
dbb7d2a8
RW		 1004 be32_to_cpu(vh->vol_id),
1005 UBI_FM_DATA_VOLUME_ID);
1006 ret = UBI_BAD_FASTMAP;
1007 goto free_hdr;
1008 }
1009 }
1010
1011 if (sqnum < be64_to_cpu(vh->sqnum))
1012 sqnum = be64_to_cpu(vh->sqnum);
1013
1014 ret = ubi_io_read(ubi, ubi->fm_buf + (ubi->leb_size * i), pnum,
1015 ubi->leb_start, ubi->leb_size);
1016 if (ret && ret != UBI_IO_BITFLIPS) {
32608703 1017 ubi_err(ubi, "unable to read fastmap block# %i (PEB: %i, "
dbb7d2a8
RW		 1018 "err: %i)", i, pnum, ret);
1019 goto free_hdr;
1020 }
1021 }
1022
1023 kfree(fmsb);
1024 fmsb = NULL;
1025
1026 fmsb2 = (struct ubi_fm_sb *)(ubi->fm_buf);
1027 tmp_crc = be32_to_cpu(fmsb2->data_crc);
1028 fmsb2->data_crc = 0;
1029 crc = crc32(UBI_CRC32_INIT, ubi->fm_buf, fm_size);
1030 if (crc != tmp_crc) {
32608703
TB		 1031 ubi_err(ubi, "fastmap data CRC is invalid");
1032 ubi_err(ubi, "CRC should be: 0x%x, calc: 0x%x",
1033 tmp_crc, crc);
dbb7d2a8
RW		 1034 ret = UBI_BAD_FASTMAP;
1035 goto free_hdr;
1036 }
1037
1038 fmsb2->sqnum = sqnum;
1039
1040 fm->used_blocks = used_blocks;
1041
1042 ret = ubi_attach_fastmap(ubi, ai, fm);
1043 if (ret) {
1044 if (ret > 0)
1045 ret = UBI_BAD_FASTMAP;
1046 goto free_hdr;
1047 }
1048
1049 for (i = 0; i < used_blocks; i++) {
1050 struct ubi_wl_entry *e;
1051
1052 e = kmem_cache_alloc(ubi_wl_entry_slab, GFP_KERNEL);
1053 if (!e) {
1054 while (i--)
1055 kfree(fm->e[i]);
1056
1057 ret = -ENOMEM;
1058 goto free_hdr;
1059 }
1060
1061 e->pnum = be32_to_cpu(fmsb2->block_loc[i]);
1062 e->ec = be32_to_cpu(fmsb2->block_ec[i]);
1063 fm->e[i] = e;
1064 }
1065
1066 ubi->fm = fm;
1067 ubi->fm_pool.max_size = ubi->fm->max_pool_size;
1068 ubi->fm_wl_pool.max_size = ubi->fm->max_wl_pool_size;
32608703
TB		 1069 ubi_msg(ubi, "attached by fastmap");
1070 ubi_msg(ubi, "fastmap pool size: %d", ubi->fm_pool.max_size);
1071 ubi_msg(ubi, "fastmap WL pool size: %d",
1072 ubi->fm_wl_pool.max_size);
dbb7d2a8
RW		 1073 ubi->fm_disabled = 0;
1074
1075 ubi_free_vid_hdr(ubi, vh);
1076 kfree(ech);
1077out:
1078 mutex_unlock(&ubi->fm_mutex);
1079 if (ret == UBI_BAD_FASTMAP)
32608703 1080 ubi_err(ubi, "Attach by fastmap failed, doing a full scan!");
dbb7d2a8
RW		 1081 return ret;
1082
1083free_hdr:
1084 ubi_free_vid_hdr(ubi, vh);
1085 kfree(ech);
1086free_fm_sb:
1087 kfree(fmsb);
1088 kfree(fm);
1089 goto out;
1090}
1091
1092/**
1093 * ubi_write_fastmap - writes a fastmap.
1094 * @ubi: UBI device object
1095 * @new_fm: the to be written fastmap
1096 *
1097 * Returns 0 on success, < 0 indicates an internal error.
1098 */
1099static int ubi_write_fastmap(struct ubi_device *ubi,
1100 struct ubi_fastmap_layout *new_fm)
1101{
1102 size_t fm_pos = 0;
1103 void *fm_raw;
1104 struct ubi_fm_sb *fmsb;
1105 struct ubi_fm_hdr *fmh;
1106 struct ubi_fm_scan_pool *fmpl1, *fmpl2;
1107 struct ubi_fm_ec *fec;
1108 struct ubi_fm_volhdr *fvh;
1109 struct ubi_fm_eba *feba;
1110 struct rb_node *node;
1111 struct ubi_wl_entry *wl_e;
1112 struct ubi_volume *vol;
1113 struct ubi_vid_hdr *avhdr, *dvhdr;
1114 struct ubi_work *ubi_wrk;
1115 int ret, i, j, free_peb_count, used_peb_count, vol_count;
1116 int scrub_peb_count, erase_peb_count;
1117
1118 fm_raw = ubi->fm_buf;
1119 memset(ubi->fm_buf, 0, ubi->fm_size);
1120
1121 avhdr = new_fm_vhdr(ubi, UBI_FM_SB_VOLUME_ID);
1122 if (!avhdr) {
1123 ret = -ENOMEM;
1124 goto out;
1125 }
1126
1127 dvhdr = new_fm_vhdr(ubi, UBI_FM_DATA_VOLUME_ID);
1128 if (!dvhdr) {
1129 ret = -ENOMEM;
1130 goto out_kfree;
1131 }
1132
1133 spin_lock(&ubi->volumes_lock);
1134 spin_lock(&ubi->wl_lock);
1135
1136 fmsb = (struct ubi_fm_sb *)fm_raw;
1137 fm_pos += sizeof(*fmsb);
1138 ubi_assert(fm_pos <= ubi->fm_size);
1139
1140 fmh = (struct ubi_fm_hdr *)(fm_raw + fm_pos);
1141 fm_pos += sizeof(*fmh);
1142 ubi_assert(fm_pos <= ubi->fm_size);
1143
1144 fmsb->magic = cpu_to_be32(UBI_FM_SB_MAGIC);
1145 fmsb->version = UBI_FM_FMT_VERSION;
1146 fmsb->used_blocks = cpu_to_be32(new_fm->used_blocks);
1147 /* the max sqnum will be filled in while *reading* the fastmap */
1148 fmsb->sqnum = 0;
1149
1150 fmh->magic = cpu_to_be32(UBI_FM_HDR_MAGIC);
1151 free_peb_count = 0;
1152 used_peb_count = 0;
1153 scrub_peb_count = 0;
1154 erase_peb_count = 0;
1155 vol_count = 0;
1156
1157 fmpl1 = (struct ubi_fm_scan_pool *)(fm_raw + fm_pos);
1158 fm_pos += sizeof(*fmpl1);
1159 fmpl1->magic = cpu_to_be32(UBI_FM_POOL_MAGIC);
1160 fmpl1->size = cpu_to_be16(ubi->fm_pool.size);
1161 fmpl1->max_size = cpu_to_be16(ubi->fm_pool.max_size);
1162
1163 for (i = 0; i < ubi->fm_pool.size; i++)
1164 fmpl1->pebs[i] = cpu_to_be32(ubi->fm_pool.pebs[i]);
1165
1166 fmpl2 = (struct ubi_fm_scan_pool *)(fm_raw + fm_pos);
1167 fm_pos += sizeof(*fmpl2);
1168 fmpl2->magic = cpu_to_be32(UBI_FM_POOL_MAGIC);
1169 fmpl2->size = cpu_to_be16(ubi->fm_wl_pool.size);
1170 fmpl2->max_size = cpu_to_be16(ubi->fm_wl_pool.max_size);
1171
1172 for (i = 0; i < ubi->fm_wl_pool.size; i++)
1173 fmpl2->pebs[i] = cpu_to_be32(ubi->fm_wl_pool.pebs[i]);
1174
1175 for (node = rb_first(&ubi->free); 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 free_peb_count++;
1183 fm_pos += sizeof(*fec);
1184 ubi_assert(fm_pos <= ubi->fm_size);
1185 }
1186 fmh->free_peb_count = cpu_to_be32(free_peb_count);
1187
1188 for (node = rb_first(&ubi->used); node; node = rb_next(node)) {
1189 wl_e = rb_entry(node, struct ubi_wl_entry, u.rb);
1190 fec = (struct ubi_fm_ec *)(fm_raw + fm_pos);
1191
1192 fec->pnum = cpu_to_be32(wl_e->pnum);
1193 fec->ec = cpu_to_be32(wl_e->ec);
1194
1195 used_peb_count++;
1196 fm_pos += sizeof(*fec);
1197 ubi_assert(fm_pos <= ubi->fm_size);
1198 }
4f5e3b6f
RW		 1199
1200 for (i = 0; i < UBI_PROT_QUEUE_LEN; i++) {
1201 list_for_each_entry(wl_e, &ubi->pq[i], u.list) {
1202 fec = (struct ubi_fm_ec *)(fm_raw + fm_pos);
1203
1204 fec->pnum = cpu_to_be32(wl_e->pnum);
1205 fec->ec = cpu_to_be32(wl_e->ec);
1206
1207 used_peb_count++;
1208 fm_pos += sizeof(*fec);
1209 ubi_assert(fm_pos <= ubi->fm_size);
1210 }
1211 }
dbb7d2a8
RW		 1212 fmh->used_peb_count = cpu_to_be32(used_peb_count);
1213
1214 for (node = rb_first(&ubi->scrub); node; node = rb_next(node)) {
1215 wl_e = rb_entry(node, struct ubi_wl_entry, u.rb);
1216 fec = (struct ubi_fm_ec *)(fm_raw + fm_pos);
1217
1218 fec->pnum = cpu_to_be32(wl_e->pnum);
1219 fec->ec = cpu_to_be32(wl_e->ec);
1220
1221 scrub_peb_count++;
1222 fm_pos += sizeof(*fec);
1223 ubi_assert(fm_pos <= ubi->fm_size);
1224 }
1225 fmh->scrub_peb_count = cpu_to_be32(scrub_peb_count);
1226
1227
1228 list_for_each_entry(ubi_wrk, &ubi->works, list) {
1229 if (ubi_is_erase_work(ubi_wrk)) {
1230 wl_e = ubi_wrk->e;
1231 ubi_assert(wl_e);
1232
1233 fec = (struct ubi_fm_ec *)(fm_raw + fm_pos);
1234
1235 fec->pnum = cpu_to_be32(wl_e->pnum);
1236 fec->ec = cpu_to_be32(wl_e->ec);
1237
1238 erase_peb_count++;
1239 fm_pos += sizeof(*fec);
1240 ubi_assert(fm_pos <= ubi->fm_size);
1241 }
1242 }
1243 fmh->erase_peb_count = cpu_to_be32(erase_peb_count);
1244
1245 for (i = 0; i < UBI_MAX_VOLUMES + UBI_INT_VOL_COUNT; i++) {
1246 vol = ubi->volumes[i];
1247
1248 if (!vol)
1249 continue;
1250
1251 vol_count++;
1252
1253 fvh = (struct ubi_fm_volhdr *)(fm_raw + fm_pos);
1254 fm_pos += sizeof(*fvh);
1255 ubi_assert(fm_pos <= ubi->fm_size);
1256
1257 fvh->magic = cpu_to_be32(UBI_FM_VHDR_MAGIC);
1258 fvh->vol_id = cpu_to_be32(vol->vol_id);
1259 fvh->vol_type = vol->vol_type;
1260 fvh->used_ebs = cpu_to_be32(vol->used_ebs);
1261 fvh->data_pad = cpu_to_be32(vol->data_pad);
1262 fvh->last_eb_bytes = cpu_to_be32(vol->last_eb_bytes);
1263
1264 ubi_assert(vol->vol_type == UBI_DYNAMIC_VOLUME ||
1265 vol->vol_type == UBI_STATIC_VOLUME);
1266
1267 feba = (struct ubi_fm_eba *)(fm_raw + fm_pos);
1268 fm_pos += sizeof(*feba) + (sizeof(__be32) * vol->reserved_pebs);
1269 ubi_assert(fm_pos <= ubi->fm_size);
1270
1271 for (j = 0; j < vol->reserved_pebs; j++)
1272 feba->pnum[j] = cpu_to_be32(vol->eba_tbl[j]);
1273
1274 feba->reserved_pebs = cpu_to_be32(j);
1275 feba->magic = cpu_to_be32(UBI_FM_EBA_MAGIC);
1276 }
1277 fmh->vol_count = cpu_to_be32(vol_count);
1278 fmh->bad_peb_count = cpu_to_be32(ubi->bad_peb_count);
1279
1280 avhdr->sqnum = cpu_to_be64(ubi_next_sqnum(ubi));
1281 avhdr->lnum = 0;
1282
1283 spin_unlock(&ubi->wl_lock);
1284 spin_unlock(&ubi->volumes_lock);
1285
1286 dbg_bld("writing fastmap SB to PEB %i", new_fm->e[0]->pnum);
1287 ret = ubi_io_write_vid_hdr(ubi, new_fm->e[0]->pnum, avhdr);
1288 if (ret) {
32608703 1289 ubi_err(ubi, "unable to write vid_hdr to fastmap SB!");
dbb7d2a8
RW		 1290 goto out_kfree;
1291 }
1292
1293 for (i = 0; i < new_fm->used_blocks; i++) {
1294 fmsb->block_loc[i] = cpu_to_be32(new_fm->e[i]->pnum);
1295 fmsb->block_ec[i] = cpu_to_be32(new_fm->e[i]->ec);
1296 }
1297
1298 fmsb->data_crc = 0;
1299 fmsb->data_crc = cpu_to_be32(crc32(UBI_CRC32_INIT, fm_raw,
1300 ubi->fm_size));
1301
1302 for (i = 1; i < new_fm->used_blocks; i++) {
1303 dvhdr->sqnum = cpu_to_be64(ubi_next_sqnum(ubi));
1304 dvhdr->lnum = cpu_to_be32(i);
1305 dbg_bld("writing fastmap data to PEB %i sqnum %llu",
1306 new_fm->e[i]->pnum, be64_to_cpu(dvhdr->sqnum));
1307 ret = ubi_io_write_vid_hdr(ubi, new_fm->e[i]->pnum, dvhdr);
1308 if (ret) {
32608703 1309 ubi_err(ubi, "unable to write vid_hdr to PEB %i!",
dbb7d2a8
RW		 1310 new_fm->e[i]->pnum);
1311 goto out_kfree;
1312 }
1313 }
1314
1315 for (i = 0; i < new_fm->used_blocks; i++) {
1316 ret = ubi_io_write(ubi, fm_raw + (i * ubi->leb_size),
1317 new_fm->e[i]->pnum, ubi->leb_start, ubi->leb_size);
1318 if (ret) {
32608703 1319 ubi_err(ubi, "unable to write fastmap to PEB %i!",
dbb7d2a8
RW		 1320 new_fm->e[i]->pnum);
1321 goto out_kfree;
1322 }
1323 }
1324
1325 ubi_assert(new_fm);
1326 ubi->fm = new_fm;
1327
1328 dbg_bld("fastmap written!");
1329
1330out_kfree:
1331 ubi_free_vid_hdr(ubi, avhdr);
1332 ubi_free_vid_hdr(ubi, dvhdr);
1333out:
1334 return ret;
1335}
1336
1337/**
1338 * erase_block - Manually erase a PEB.
1339 * @ubi: UBI device object
1340 * @pnum: PEB to be erased
1341 *
1342 * Returns the new EC value on success, < 0 indicates an internal error.
1343 */
1344static int erase_block(struct ubi_device *ubi, int pnum)
1345{
1346 int ret;
1347 struct ubi_ec_hdr *ec_hdr;
1348 long long ec;
1349
1350 ec_hdr = kzalloc(ubi->ec_hdr_alsize, GFP_KERNEL);
1351 if (!ec_hdr)
1352 return -ENOMEM;
1353
1354 ret = ubi_io_read_ec_hdr(ubi, pnum, ec_hdr, 0);
1355 if (ret < 0)
1356 goto out;
1357 else if (ret && ret != UBI_IO_BITFLIPS) {
1358 ret = -EINVAL;
1359 goto out;
1360 }
1361
1362 ret = ubi_io_sync_erase(ubi, pnum, 0);
1363 if (ret < 0)
1364 goto out;
1365
1366 ec = be64_to_cpu(ec_hdr->ec);
1367 ec += ret;
1368 if (ec > UBI_MAX_ERASECOUNTER) {
1369 ret = -EINVAL;
1370 goto out;
1371 }
1372
1373 ec_hdr->ec = cpu_to_be64(ec);
1374 ret = ubi_io_write_ec_hdr(ubi, pnum, ec_hdr);
1375 if (ret < 0)
1376 goto out;
1377
1378 ret = ec;
1379out:
1380 kfree(ec_hdr);
1381 return ret;
1382}
1383
1384/**
1385 * invalidate_fastmap - destroys a fastmap.
1386 * @ubi: UBI device object
1387 * @fm: the fastmap to be destroyed
1388 *
1389 * Returns 0 on success, < 0 indicates an internal error.
1390 */
1391static int invalidate_fastmap(struct ubi_device *ubi,
1392 struct ubi_fastmap_layout *fm)
1393{
8930fa50 1394 int ret;
dbb7d2a8
RW		 1395 struct ubi_vid_hdr *vh;
1396
1397 ret = erase_block(ubi, fm->e[0]->pnum);
1398 if (ret < 0)
1399 return ret;
1400
1401 vh = new_fm_vhdr(ubi, UBI_FM_SB_VOLUME_ID);
1402 if (!vh)
1403 return -ENOMEM;
1404
1405 /* deleting the current fastmap SB is not enough, an old SB may exist,
1406 * so create a (corrupted) SB such that fastmap will find it and fall
1407 * back to scanning mode in any case */
1408 vh->sqnum = cpu_to_be64(ubi_next_sqnum(ubi));
1409 ret = ubi_io_write_vid_hdr(ubi, fm->e[0]->pnum, vh);
1410
dbb7d2a8
RW		 1411 return ret;
1412}
1413
1414/**
1415 * ubi_update_fastmap - will be called by UBI if a volume changes or
1416 * a fastmap pool becomes full.
1417 * @ubi: UBI device object
1418 *
1419 * Returns 0 on success, < 0 indicates an internal error.
1420 */
1421int ubi_update_fastmap(struct ubi_device *ubi)
1422{
1423 int ret, i;
1424 struct ubi_fastmap_layout *new_fm, *old_fm;
1425 struct ubi_wl_entry *tmp_e;
1426
1427 mutex_lock(&ubi->fm_mutex);
1428
1429 ubi_refill_pools(ubi);
1430
1431 if (ubi->ro_mode || ubi->fm_disabled) {
1432 mutex_unlock(&ubi->fm_mutex);
1433 return 0;
1434 }
1435
1436 ret = ubi_ensure_anchor_pebs(ubi);
1437 if (ret) {
1438 mutex_unlock(&ubi->fm_mutex);
1439 return ret;
1440 }
1441
1442 new_fm = kzalloc(sizeof(*new_fm), GFP_KERNEL);
1443 if (!new_fm) {
1444 mutex_unlock(&ubi->fm_mutex);
1445 return -ENOMEM;
1446 }
1447
1448 new_fm->used_blocks = ubi->fm_size / ubi->leb_size;
1449
1450 for (i = 0; i < new_fm->used_blocks; i++) {
1451 new_fm->e[i] = kmem_cache_alloc(ubi_wl_entry_slab, GFP_KERNEL);
1452 if (!new_fm->e[i]) {
1453 while (i--)
1454 kfree(new_fm->e[i]);
1455
1456 kfree(new_fm);
1457 mutex_unlock(&ubi->fm_mutex);
1458 return -ENOMEM;
1459 }
1460 }
1461
1462 old_fm = ubi->fm;
1463 ubi->fm = NULL;
1464
1465 if (new_fm->used_blocks > UBI_FM_MAX_BLOCKS) {
32608703 1466 ubi_err(ubi, "fastmap too large");
dbb7d2a8
RW		 1467 ret = -ENOSPC;
1468 goto err;
1469 }
1470
1471 for (i = 1; i < new_fm->used_blocks; i++) {
1472 spin_lock(&ubi->wl_lock);
1473 tmp_e = ubi_wl_get_fm_peb(ubi, 0);
1474 spin_unlock(&ubi->wl_lock);
1475
1476 if (!tmp_e && !old_fm) {
1477 int j;
32608703 1478 ubi_err(ubi, "could not get any free erase block");
dbb7d2a8
RW		 1479
1480 for (j = 1; j < i; j++)
1481 ubi_wl_put_fm_peb(ubi, new_fm->e[j], j, 0);
1482
1483 ret = -ENOSPC;
1484 goto err;
1485 } else if (!tmp_e && old_fm) {
1486 ret = erase_block(ubi, old_fm->e[i]->pnum);
1487 if (ret < 0) {
1488 int j;
1489
1490 for (j = 1; j < i; j++)
1491 ubi_wl_put_fm_peb(ubi, new_fm->e[j],
1492 j, 0);
1493
32608703 1494 ubi_err(ubi, "could not erase old fastmap PEB");
dbb7d2a8
RW		 1495 goto err;
1496 }
1497
1498 new_fm->e[i]->pnum = old_fm->e[i]->pnum;
1499 new_fm->e[i]->ec = old_fm->e[i]->ec;
1500 } else {
1501 new_fm->e[i]->pnum = tmp_e->pnum;
1502 new_fm->e[i]->ec = tmp_e->ec;
1503
1504 if (old_fm)
1505 ubi_wl_put_fm_peb(ubi, old_fm->e[i], i,
1506 old_fm->to_be_tortured[i]);
1507 }
1508 }
1509
1510 spin_lock(&ubi->wl_lock);
1511 tmp_e = ubi_wl_get_fm_peb(ubi, 1);
1512 spin_unlock(&ubi->wl_lock);
1513
1514 if (old_fm) {
1515 /* no fresh anchor PEB was found, reuse the old one */
1516 if (!tmp_e) {
1517 ret = erase_block(ubi, old_fm->e[0]->pnum);
1518 if (ret < 0) {
1519 int i;
32608703 1520 ubi_err(ubi, "could not erase old anchor PEB");
dbb7d2a8
RW		 1521
1522 for (i = 1; i < new_fm->used_blocks; i++)
1523 ubi_wl_put_fm_peb(ubi, new_fm->e[i],
1524 i, 0);
1525 goto err;
1526 }
1527
1528 new_fm->e[0]->pnum = old_fm->e[0]->pnum;
1529 new_fm->e[0]->ec = ret;
1530 } else {
1531 /* we've got a new anchor PEB, return the old one */
1532 ubi_wl_put_fm_peb(ubi, old_fm->e[0], 0,
1533 old_fm->to_be_tortured[0]);
1534
1535 new_fm->e[0]->pnum = tmp_e->pnum;
1536 new_fm->e[0]->ec = tmp_e->ec;
1537 }
1538 } else {
1539 if (!tmp_e) {
1540 int i;
32608703 1541 ubi_err(ubi, "could not find any anchor PEB");
dbb7d2a8
RW		 1542
1543 for (i = 1; i < new_fm->used_blocks; i++)
1544 ubi_wl_put_fm_peb(ubi, new_fm->e[i], i, 0);
1545
1546 ret = -ENOSPC;
1547 goto err;
1548 }
1549
1550 new_fm->e[0]->pnum = tmp_e->pnum;
1551 new_fm->e[0]->ec = tmp_e->ec;
1552 }
1553
1554 down_write(&ubi->work_sem);
1555 down_write(&ubi->fm_sem);
1556 ret = ubi_write_fastmap(ubi, new_fm);
1557 up_write(&ubi->fm_sem);
1558 up_write(&ubi->work_sem);
1559
1560 if (ret)
1561 goto err;
1562
1563out_unlock:
1564 mutex_unlock(&ubi->fm_mutex);
1565 kfree(old_fm);
1566 return ret;
1567
1568err:
1569 kfree(new_fm);
1570
32608703 1571 ubi_warn(ubi, "Unable to write new fastmap, err=%i", ret);
dbb7d2a8
RW		 1572
1573 ret = 0;
1574 if (old_fm) {
1575 ret = invalidate_fastmap(ubi, old_fm);
1576 if (ret < 0)
32608703 1577 ubi_err(ubi, "Unable to invalidiate current fastmap!");
dbb7d2a8
RW		 1578 else if (ret)
1579 ret = 0;
1580 }
1581 goto out_unlock;
1582}
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