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perf bench futex: Cache align the worker struct
[linux/fpc-iii.git] / drivers / mtd / ubi / fastmap.c
blobd6384d9657885c31c01e8fa1a5a2ed82530b0891
1 /*
2 * Copyright (c) 2012 Linutronix GmbH
3 * Copyright (c) 2014 sigma star gmbh
4 * Author: Richard Weinberger <richard@nod.at>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; version 2.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
13 * the GNU General Public License for more details.
14 *
15 */
16
17 #include <linux/crc32.h>
18 #include <linux/bitmap.h>
19 #include "ubi.h"
20
21 /**
22 * init_seen - allocate memory for used for debugging.
23 * @ubi: UBI device description object
24 */
25 static inline unsigned long *init_seen(struct ubi_device *ubi)
26 {
27 unsigned long *ret;
28
29 if (!ubi_dbg_chk_fastmap(ubi))
30 return NULL;
31
32 ret = kcalloc(BITS_TO_LONGS(ubi->peb_count), sizeof(unsigned long),
33 GFP_KERNEL);
34 if (!ret)
35 return ERR_PTR(-ENOMEM);
36
37 return ret;
38 }
39
40 /**
41 * free_seen - free the seen logic integer array.
42 * @seen: integer array of @ubi->peb_count size
43 */
44 static inline void free_seen(unsigned long *seen)
45 {
46 kfree(seen);
47 }
48
49 /**
50 * set_seen - mark a PEB as seen.
51 * @ubi: UBI device description object
52 * @pnum: The PEB to be makred as seen
53 * @seen: integer array of @ubi->peb_count size
54 */
55 static inline void set_seen(struct ubi_device *ubi, int pnum, unsigned long *seen)
56 {
57 if (!ubi_dbg_chk_fastmap(ubi) || !seen)
58 return;
59
60 set_bit(pnum, seen);
61 }
62
63 /**
64 * self_check_seen - check whether all PEB have been seen by fastmap.
65 * @ubi: UBI device description object
66 * @seen: integer array of @ubi->peb_count size
67 */
68 static int self_check_seen(struct ubi_device *ubi, unsigned long *seen)
69 {
70 int pnum, ret = 0;
71
72 if (!ubi_dbg_chk_fastmap(ubi) || !seen)
73 return 0;
74
75 for (pnum = 0; pnum < ubi->peb_count; pnum++) {
76 if (test_bit(pnum, seen) && ubi->lookuptbl[pnum]) {
77 ubi_err(ubi, "self-check failed for PEB %d, fastmap didn't see it", pnum);
78 ret = -EINVAL;
79 }
80 }
81
82 return ret;
83 }
84
85 /**
86 * ubi_calc_fm_size - calculates the fastmap size in bytes for an UBI device.
87 * @ubi: UBI device description object
88 */
89 size_t ubi_calc_fm_size(struct ubi_device *ubi)
90 {
91 size_t size;
92
93 size = sizeof(struct ubi_fm_sb) +
94 sizeof(struct ubi_fm_hdr) +
95 sizeof(struct ubi_fm_scan_pool) +
96 sizeof(struct ubi_fm_scan_pool) +
97 (ubi->peb_count * sizeof(struct ubi_fm_ec)) +
98 (sizeof(struct ubi_fm_eba) +
99 (ubi->peb_count * sizeof(__be32))) +
100 sizeof(struct ubi_fm_volhdr) * UBI_MAX_VOLUMES;
101 return roundup(size, ubi->leb_size);
102 }
103
104
105 /**
106 * new_fm_vhdr - allocate a new volume header for fastmap usage.
107 * @ubi: UBI device description object
108 * @vol_id: the VID of the new header
109 *
110 * Returns a new struct ubi_vid_hdr on success.
111 * NULL indicates out of memory.
112 */
113 static struct ubi_vid_io_buf *new_fm_vbuf(struct ubi_device *ubi, int vol_id)
114 {
115 struct ubi_vid_io_buf *new;
116 struct ubi_vid_hdr *vh;
117
118 new = ubi_alloc_vid_buf(ubi, GFP_KERNEL);
119 if (!new)
120 goto out;
121
122 vh = ubi_get_vid_hdr(new);
123 vh->vol_type = UBI_VID_DYNAMIC;
124 vh->vol_id = cpu_to_be32(vol_id);
125
126 /* UBI implementations without fastmap support have to delete the
127 * fastmap.
128 */
129 vh->compat = UBI_COMPAT_DELETE;
130
131 out:
132 return new;
133 }
134
135 /**
136 * add_aeb - create and add a attach erase block to a given list.
137 * @ai: UBI attach info object
138 * @list: the target list
139 * @pnum: PEB number of the new attach erase block
140 * @ec: erease counter of the new LEB
141 * @scrub: scrub this PEB after attaching
142 *
143 * Returns 0 on success, < 0 indicates an internal error.
144 */
145 static int add_aeb(struct ubi_attach_info *ai, struct list_head *list,
146 int pnum, int ec, int scrub)
147 {
148 struct ubi_ainf_peb *aeb;
149
150 aeb = ubi_alloc_aeb(ai, pnum, ec);
151 if (!aeb)
152 return -ENOMEM;
153
154 aeb->lnum = -1;
155 aeb->scrub = scrub;
156 aeb->copy_flag = aeb->sqnum = 0;
157
158 ai->ec_sum += aeb->ec;
159 ai->ec_count++;
160
161 if (ai->max_ec < aeb->ec)
162 ai->max_ec = aeb->ec;
163
164 if (ai->min_ec > aeb->ec)
165 ai->min_ec = aeb->ec;
166
167 list_add_tail(&aeb->u.list, list);
168
169 return 0;
170 }
171
172 /**
173 * add_vol - create and add a new volume to ubi_attach_info.
174 * @ai: ubi_attach_info object
175 * @vol_id: VID of the new volume
176 * @used_ebs: number of used EBS
177 * @data_pad: data padding value of the new volume
178 * @vol_type: volume type
179 * @last_eb_bytes: number of bytes in the last LEB
180 *
181 * Returns the new struct ubi_ainf_volume on success.
182 * NULL indicates an error.
183 */
184 static struct ubi_ainf_volume *add_vol(struct ubi_attach_info *ai, int vol_id,
185 int used_ebs, int data_pad, u8 vol_type,
186 int last_eb_bytes)
187 {
188 struct ubi_ainf_volume *av;
189
190 av = ubi_add_av(ai, vol_id);
191 if (IS_ERR(av))
192 return av;
193
194 av->data_pad = data_pad;
195 av->last_data_size = last_eb_bytes;
196 av->compat = 0;
197 av->vol_type = vol_type;
198 if (av->vol_type == UBI_STATIC_VOLUME)
199 av->used_ebs = used_ebs;
200
201 dbg_bld("found volume (ID %i)", vol_id);
202 return av;
203 }
204
205 /**
206 * assign_aeb_to_av - assigns a SEB to a given ainf_volume and removes it
207 * from it's original list.
208 * @ai: ubi_attach_info object
209 * @aeb: the to be assigned SEB
210 * @av: target scan volume
211 */
212 static void assign_aeb_to_av(struct ubi_attach_info *ai,
213 struct ubi_ainf_peb *aeb,
214 struct ubi_ainf_volume *av)
215 {
216 struct ubi_ainf_peb *tmp_aeb;
217 struct rb_node **p = &ai->volumes.rb_node, *parent = NULL;
218
219 p = &av->root.rb_node;
220 while (*p) {
221 parent = *p;
222
223 tmp_aeb = rb_entry(parent, struct ubi_ainf_peb, u.rb);
224 if (aeb->lnum != tmp_aeb->lnum) {
225 if (aeb->lnum < tmp_aeb->lnum)
226 p = &(*p)->rb_left;
227 else
228 p = &(*p)->rb_right;
229
230 continue;
231 } else
232 break;
233 }
234
235 list_del(&aeb->u.list);
236 av->leb_count++;
237
238 rb_link_node(&aeb->u.rb, parent, p);
239 rb_insert_color(&aeb->u.rb, &av->root);
240 }
241
242 /**
243 * update_vol - inserts or updates a LEB which was found a pool.
244 * @ubi: the UBI device object
245 * @ai: attach info object
246 * @av: the volume this LEB belongs to
247 * @new_vh: the volume header derived from new_aeb
248 * @new_aeb: the AEB to be examined
249 *
250 * Returns 0 on success, < 0 indicates an internal error.
251 */
252 static int update_vol(struct ubi_device *ubi, struct ubi_attach_info *ai,
253 struct ubi_ainf_volume *av, struct ubi_vid_hdr *new_vh,
254 struct ubi_ainf_peb *new_aeb)
255 {
256 struct rb_node **p = &av->root.rb_node, *parent = NULL;
257 struct ubi_ainf_peb *aeb, *victim;
258 int cmp_res;
259
260 while (*p) {
261 parent = *p;
262 aeb = rb_entry(parent, struct ubi_ainf_peb, u.rb);
263
264 if (be32_to_cpu(new_vh->lnum) != aeb->lnum) {
265 if (be32_to_cpu(new_vh->lnum) < aeb->lnum)
266 p = &(*p)->rb_left;
267 else
268 p = &(*p)->rb_right;
269
270 continue;
271 }
272
273 /* This case can happen if the fastmap gets written
274 * because of a volume change (creation, deletion, ..).
275 * Then a PEB can be within the persistent EBA and the pool.
276 */
277 if (aeb->pnum == new_aeb->pnum) {
278 ubi_assert(aeb->lnum == new_aeb->lnum);
279 ubi_free_aeb(ai, new_aeb);
280
281 return 0;
282 }
283
284 cmp_res = ubi_compare_lebs(ubi, aeb, new_aeb->pnum, new_vh);
285 if (cmp_res < 0)
286 return cmp_res;
287
288 /* new_aeb is newer */
289 if (cmp_res & 1) {
290 victim = ubi_alloc_aeb(ai, aeb->ec, aeb->pnum);
291 if (!victim)
292 return -ENOMEM;
293
294 list_add_tail(&victim->u.list, &ai->erase);
295
296 if (av->highest_lnum == be32_to_cpu(new_vh->lnum))
297 av->last_data_size =
298 be32_to_cpu(new_vh->data_size);
299
300 dbg_bld("vol %i: AEB %i's PEB %i is the newer",
301 av->vol_id, aeb->lnum, new_aeb->pnum);
302
303 aeb->ec = new_aeb->ec;
304 aeb->pnum = new_aeb->pnum;
305 aeb->copy_flag = new_vh->copy_flag;
306 aeb->scrub = new_aeb->scrub;
307 aeb->sqnum = new_aeb->sqnum;
308 ubi_free_aeb(ai, new_aeb);
309
310 /* new_aeb is older */
311 } else {
312 dbg_bld("vol %i: AEB %i's PEB %i is old, dropping it",
313 av->vol_id, aeb->lnum, new_aeb->pnum);
314 list_add_tail(&new_aeb->u.list, &ai->erase);
315 }
316
317 return 0;
318 }
319 /* This LEB is new, let's add it to the volume */
320
321 if (av->highest_lnum <= be32_to_cpu(new_vh->lnum)) {
322 av->highest_lnum = be32_to_cpu(new_vh->lnum);
323 av->last_data_size = be32_to_cpu(new_vh->data_size);
324 }
325
326 if (av->vol_type == UBI_STATIC_VOLUME)
327 av->used_ebs = be32_to_cpu(new_vh->used_ebs);
328
329 av->leb_count++;
330
331 rb_link_node(&new_aeb->u.rb, parent, p);
332 rb_insert_color(&new_aeb->u.rb, &av->root);
333
334 return 0;
335 }
336
337 /**
338 * process_pool_aeb - we found a non-empty PEB in a pool.
339 * @ubi: UBI device object
340 * @ai: attach info object
341 * @new_vh: the volume header derived from new_aeb
342 * @new_aeb: the AEB to be examined
343 *
344 * Returns 0 on success, < 0 indicates an internal error.
345 */
346 static int process_pool_aeb(struct ubi_device *ubi, struct ubi_attach_info *ai,
347 struct ubi_vid_hdr *new_vh,
348 struct ubi_ainf_peb *new_aeb)
349 {
350 int vol_id = be32_to_cpu(new_vh->vol_id);
351 struct ubi_ainf_volume *av;
352
353 if (vol_id == UBI_FM_SB_VOLUME_ID || vol_id == UBI_FM_DATA_VOLUME_ID) {
354 ubi_free_aeb(ai, new_aeb);
355
356 return 0;
357 }
358
359 /* Find the volume this SEB belongs to */
360 av = ubi_find_av(ai, vol_id);
361 if (!av) {
362 ubi_err(ubi, "orphaned volume in fastmap pool!");
363 ubi_free_aeb(ai, new_aeb);
364 return UBI_BAD_FASTMAP;
365 }
366
367 ubi_assert(vol_id == av->vol_id);
368
369 return update_vol(ubi, ai, av, new_vh, new_aeb);
370 }
371
372 /**
373 * unmap_peb - unmap a PEB.
374 * If fastmap detects a free PEB in the pool it has to check whether
375 * this PEB has been unmapped after writing the fastmap.
376 *
377 * @ai: UBI attach info object
378 * @pnum: The PEB to be unmapped
379 */
380 static void unmap_peb(struct ubi_attach_info *ai, int pnum)
381 {
382 struct ubi_ainf_volume *av;
383 struct rb_node *node, *node2;
384 struct ubi_ainf_peb *aeb;
385
386 ubi_rb_for_each_entry(node, av, &ai->volumes, rb) {
387 ubi_rb_for_each_entry(node2, aeb, &av->root, u.rb) {
388 if (aeb->pnum == pnum) {
389 rb_erase(&aeb->u.rb, &av->root);
390 av->leb_count--;
391 ubi_free_aeb(ai, aeb);
392 return;
393 }
394 }
395 }
396 }
397
398 /**
399 * scan_pool - scans a pool for changed (no longer empty PEBs).
400 * @ubi: UBI device object
401 * @ai: attach info object
402 * @pebs: an array of all PEB numbers in the to be scanned pool
403 * @pool_size: size of the pool (number of entries in @pebs)
404 * @max_sqnum: pointer to the maximal sequence number
405 * @free: list of PEBs which are most likely free (and go into @ai->free)
406 *
407 * Returns 0 on success, if the pool is unusable UBI_BAD_FASTMAP is returned.
408 * < 0 indicates an internal error.
409 */
410 static int scan_pool(struct ubi_device *ubi, struct ubi_attach_info *ai,
411 __be32 *pebs, int pool_size, unsigned long long *max_sqnum,
412 struct list_head *free)
413 {
414 struct ubi_vid_io_buf *vb;
415 struct ubi_vid_hdr *vh;
416 struct ubi_ec_hdr *ech;
417 struct ubi_ainf_peb *new_aeb;
418 int i, pnum, err, ret = 0;
419
420 ech = kzalloc(ubi->ec_hdr_alsize, GFP_KERNEL);
421 if (!ech)
422 return -ENOMEM;
423
424 vb = ubi_alloc_vid_buf(ubi, GFP_KERNEL);
425 if (!vb) {
426 kfree(ech);
427 return -ENOMEM;
428 }
429
430 vh = ubi_get_vid_hdr(vb);
431
432 dbg_bld("scanning fastmap pool: size = %i", pool_size);
433
434 /*
435 * Now scan all PEBs in the pool to find changes which have been made
436 * after the creation of the fastmap
437 */
438 for (i = 0; i < pool_size; i++) {
439 int scrub = 0;
440 int image_seq;
441
442 pnum = be32_to_cpu(pebs[i]);
443
444 if (ubi_io_is_bad(ubi, pnum)) {
445 ubi_err(ubi, "bad PEB in fastmap pool!");
446 ret = UBI_BAD_FASTMAP;
447 goto out;
448 }
449
450 err = ubi_io_read_ec_hdr(ubi, pnum, ech, 0);
451 if (err && err != UBI_IO_BITFLIPS) {
452 ubi_err(ubi, "unable to read EC header! PEB:%i err:%i",
453 pnum, err);
454 ret = err > 0 ? UBI_BAD_FASTMAP : err;
455 goto out;
456 } else if (err == UBI_IO_BITFLIPS)
457 scrub = 1;
458
459 /*
460 * Older UBI implementations have image_seq set to zero, so
461 * we shouldn't fail if image_seq == 0.
462 */
463 image_seq = be32_to_cpu(ech->image_seq);
464
465 if (image_seq && (image_seq != ubi->image_seq)) {
466 ubi_err(ubi, "bad image seq: 0x%x, expected: 0x%x",
467 be32_to_cpu(ech->image_seq), ubi->image_seq);
468 ret = UBI_BAD_FASTMAP;
469 goto out;
470 }
471
472 err = ubi_io_read_vid_hdr(ubi, pnum, vb, 0);
473 if (err == UBI_IO_FF || err == UBI_IO_FF_BITFLIPS) {
474 unsigned long long ec = be64_to_cpu(ech->ec);
475 unmap_peb(ai, pnum);
476 dbg_bld("Adding PEB to free: %i", pnum);
477
478 if (err == UBI_IO_FF_BITFLIPS)
479 scrub = 1;
480
481 add_aeb(ai, free, pnum, ec, scrub);
482 continue;
483 } else if (err == 0 || err == UBI_IO_BITFLIPS) {
484 dbg_bld("Found non empty PEB:%i in pool", pnum);
485
486 if (err == UBI_IO_BITFLIPS)
487 scrub = 1;
488
489 new_aeb = ubi_alloc_aeb(ai, pnum, be64_to_cpu(ech->ec));
490 if (!new_aeb) {
491 ret = -ENOMEM;
492 goto out;
493 }
494
495 new_aeb->lnum = be32_to_cpu(vh->lnum);
496 new_aeb->sqnum = be64_to_cpu(vh->sqnum);
497 new_aeb->copy_flag = vh->copy_flag;
498 new_aeb->scrub = scrub;
499
500 if (*max_sqnum < new_aeb->sqnum)
501 *max_sqnum = new_aeb->sqnum;
502
503 err = process_pool_aeb(ubi, ai, vh, new_aeb);
504 if (err) {
505 ret = err > 0 ? UBI_BAD_FASTMAP : err;
506 goto out;
507 }
508 } else {
509 /* We are paranoid and fall back to scanning mode */
510 ubi_err(ubi, "fastmap pool PEBs contains damaged PEBs!");
511 ret = err > 0 ? UBI_BAD_FASTMAP : err;
512 goto out;
513 }
514
515 }
516
517 out:
518 ubi_free_vid_buf(vb);
519 kfree(ech);
520 return ret;
521 }
522
523 /**
524 * count_fastmap_pebs - Counts the PEBs found by fastmap.
525 * @ai: The UBI attach info object
526 */
527 static int count_fastmap_pebs(struct ubi_attach_info *ai)
528 {
529 struct ubi_ainf_peb *aeb;
530 struct ubi_ainf_volume *av;
531 struct rb_node *rb1, *rb2;
532 int n = 0;
533
534 list_for_each_entry(aeb, &ai->erase, u.list)
535 n++;
536
537 list_for_each_entry(aeb, &ai->free, u.list)
538 n++;
539
540 ubi_rb_for_each_entry(rb1, av, &ai->volumes, rb)
541 ubi_rb_for_each_entry(rb2, aeb, &av->root, u.rb)
542 n++;
543
544 return n;
545 }
546
547 /**
548 * ubi_attach_fastmap - creates ubi_attach_info from a fastmap.
549 * @ubi: UBI device object
550 * @ai: UBI attach info object
551 * @fm: the fastmap to be attached
552 *
553 * Returns 0 on success, UBI_BAD_FASTMAP if the found fastmap was unusable.
554 * < 0 indicates an internal error.
555 */
556 static int ubi_attach_fastmap(struct ubi_device *ubi,
557 struct ubi_attach_info *ai,
558 struct ubi_fastmap_layout *fm)
559 {
560 struct list_head used, free;
561 struct ubi_ainf_volume *av;
562 struct ubi_ainf_peb *aeb, *tmp_aeb, *_tmp_aeb;
563 struct ubi_fm_sb *fmsb;
564 struct ubi_fm_hdr *fmhdr;
565 struct ubi_fm_scan_pool *fmpl, *fmpl_wl;
566 struct ubi_fm_ec *fmec;
567 struct ubi_fm_volhdr *fmvhdr;
568 struct ubi_fm_eba *fm_eba;
569 int ret, i, j, pool_size, wl_pool_size;
570 size_t fm_pos = 0, fm_size = ubi->fm_size;
571 unsigned long long max_sqnum = 0;
572 void *fm_raw = ubi->fm_buf;
573
574 INIT_LIST_HEAD(&used);
575 INIT_LIST_HEAD(&free);
576 ai->min_ec = UBI_MAX_ERASECOUNTER;
577
578 fmsb = (struct ubi_fm_sb *)(fm_raw);
579 ai->max_sqnum = fmsb->sqnum;
580 fm_pos += sizeof(struct ubi_fm_sb);
581 if (fm_pos >= fm_size)
582 goto fail_bad;
583
584 fmhdr = (struct ubi_fm_hdr *)(fm_raw + fm_pos);
585 fm_pos += sizeof(*fmhdr);
586 if (fm_pos >= fm_size)
587 goto fail_bad;
588
589 if (be32_to_cpu(fmhdr->magic) != UBI_FM_HDR_MAGIC) {
590 ubi_err(ubi, "bad fastmap header magic: 0x%x, expected: 0x%x",
591 be32_to_cpu(fmhdr->magic), UBI_FM_HDR_MAGIC);
592 goto fail_bad;
593 }
594
595 fmpl = (struct ubi_fm_scan_pool *)(fm_raw + fm_pos);
596 fm_pos += sizeof(*fmpl);
597 if (fm_pos >= fm_size)
598 goto fail_bad;
599 if (be32_to_cpu(fmpl->magic) != UBI_FM_POOL_MAGIC) {
600 ubi_err(ubi, "bad fastmap pool magic: 0x%x, expected: 0x%x",
601 be32_to_cpu(fmpl->magic), UBI_FM_POOL_MAGIC);
602 goto fail_bad;
603 }
604
605 fmpl_wl = (struct ubi_fm_scan_pool *)(fm_raw + fm_pos);
606 fm_pos += sizeof(*fmpl_wl);
607 if (fm_pos >= fm_size)
608 goto fail_bad;
609 if (be32_to_cpu(fmpl_wl->magic) != UBI_FM_POOL_MAGIC) {
610 ubi_err(ubi, "bad fastmap WL pool magic: 0x%x, expected: 0x%x",
611 be32_to_cpu(fmpl_wl->magic), UBI_FM_POOL_MAGIC);
612 goto fail_bad;
613 }
614
615 pool_size = be16_to_cpu(fmpl->size);
616 wl_pool_size = be16_to_cpu(fmpl_wl->size);
617 fm->max_pool_size = be16_to_cpu(fmpl->max_size);
618 fm->max_wl_pool_size = be16_to_cpu(fmpl_wl->max_size);
619
620 if (pool_size > UBI_FM_MAX_POOL_SIZE || pool_size < 0) {
621 ubi_err(ubi, "bad pool size: %i", pool_size);
622 goto fail_bad;
623 }
624
625 if (wl_pool_size > UBI_FM_MAX_POOL_SIZE || wl_pool_size < 0) {
626 ubi_err(ubi, "bad WL pool size: %i", wl_pool_size);
627 goto fail_bad;
628 }
629
630
631 if (fm->max_pool_size > UBI_FM_MAX_POOL_SIZE ||
632 fm->max_pool_size < 0) {
633 ubi_err(ubi, "bad maximal pool size: %i", fm->max_pool_size);
634 goto fail_bad;
635 }
636
637 if (fm->max_wl_pool_size > UBI_FM_MAX_POOL_SIZE ||
638 fm->max_wl_pool_size < 0) {
639 ubi_err(ubi, "bad maximal WL pool size: %i",
640 fm->max_wl_pool_size);
641 goto fail_bad;
642 }
643
644 /* read EC values from free list */
645 for (i = 0; i < be32_to_cpu(fmhdr->free_peb_count); i++) {
646 fmec = (struct ubi_fm_ec *)(fm_raw + fm_pos);
647 fm_pos += sizeof(*fmec);
648 if (fm_pos >= fm_size)
649 goto fail_bad;
650
651 add_aeb(ai, &ai->free, be32_to_cpu(fmec->pnum),
652 be32_to_cpu(fmec->ec), 0);
653 }
654
655 /* read EC values from used list */
656 for (i = 0; i < be32_to_cpu(fmhdr->used_peb_count); i++) {
657 fmec = (struct ubi_fm_ec *)(fm_raw + fm_pos);
658 fm_pos += sizeof(*fmec);
659 if (fm_pos >= fm_size)
660 goto fail_bad;
661
662 add_aeb(ai, &used, be32_to_cpu(fmec->pnum),
663 be32_to_cpu(fmec->ec), 0);
664 }
665
666 /* read EC values from scrub list */
667 for (i = 0; i < be32_to_cpu(fmhdr->scrub_peb_count); i++) {
668 fmec = (struct ubi_fm_ec *)(fm_raw + fm_pos);
669 fm_pos += sizeof(*fmec);
670 if (fm_pos >= fm_size)
671 goto fail_bad;
672
673 add_aeb(ai, &used, be32_to_cpu(fmec->pnum),
674 be32_to_cpu(fmec->ec), 1);
675 }
676
677 /* read EC values from erase list */
678 for (i = 0; i < be32_to_cpu(fmhdr->erase_peb_count); i++) {
679 fmec = (struct ubi_fm_ec *)(fm_raw + fm_pos);
680 fm_pos += sizeof(*fmec);
681 if (fm_pos >= fm_size)
682 goto fail_bad;
683
684 add_aeb(ai, &ai->erase, be32_to_cpu(fmec->pnum),
685 be32_to_cpu(fmec->ec), 1);
686 }
687
688 ai->mean_ec = div_u64(ai->ec_sum, ai->ec_count);
689 ai->bad_peb_count = be32_to_cpu(fmhdr->bad_peb_count);
690
691 /* Iterate over all volumes and read their EBA table */
692 for (i = 0; i < be32_to_cpu(fmhdr->vol_count); i++) {
693 fmvhdr = (struct ubi_fm_volhdr *)(fm_raw + fm_pos);
694 fm_pos += sizeof(*fmvhdr);
695 if (fm_pos >= fm_size)
696 goto fail_bad;
697
698 if (be32_to_cpu(fmvhdr->magic) != UBI_FM_VHDR_MAGIC) {
699 ubi_err(ubi, "bad fastmap vol header magic: 0x%x, expected: 0x%x",
700 be32_to_cpu(fmvhdr->magic), UBI_FM_VHDR_MAGIC);
701 goto fail_bad;
702 }
703
704 av = add_vol(ai, be32_to_cpu(fmvhdr->vol_id),
705 be32_to_cpu(fmvhdr->used_ebs),
706 be32_to_cpu(fmvhdr->data_pad),
707 fmvhdr->vol_type,
708 be32_to_cpu(fmvhdr->last_eb_bytes));
709
710 if (!av)
711 goto fail_bad;
712 if (PTR_ERR(av) == -EINVAL) {
713 ubi_err(ubi, "volume (ID %i) already exists",
714 fmvhdr->vol_id);
715 goto fail_bad;
716 }
717
718 ai->vols_found++;
719 if (ai->highest_vol_id < be32_to_cpu(fmvhdr->vol_id))
720 ai->highest_vol_id = be32_to_cpu(fmvhdr->vol_id);
721
722 fm_eba = (struct ubi_fm_eba *)(fm_raw + fm_pos);
723 fm_pos += sizeof(*fm_eba);
724 fm_pos += (sizeof(__be32) * be32_to_cpu(fm_eba->reserved_pebs));
725 if (fm_pos >= fm_size)
726 goto fail_bad;
727
728 if (be32_to_cpu(fm_eba->magic) != UBI_FM_EBA_MAGIC) {
729 ubi_err(ubi, "bad fastmap EBA header magic: 0x%x, expected: 0x%x",
730 be32_to_cpu(fm_eba->magic), UBI_FM_EBA_MAGIC);
731 goto fail_bad;
732 }
733
734 for (j = 0; j < be32_to_cpu(fm_eba->reserved_pebs); j++) {
735 int pnum = be32_to_cpu(fm_eba->pnum[j]);
736
737 if (pnum < 0)
738 continue;
739
740 aeb = NULL;
741 list_for_each_entry(tmp_aeb, &used, u.list) {
742 if (tmp_aeb->pnum == pnum) {
743 aeb = tmp_aeb;
744 break;
745 }
746 }
747
748 if (!aeb) {
749 ubi_err(ubi, "PEB %i is in EBA but not in used list", pnum);
750 goto fail_bad;
751 }
752
753 aeb->lnum = j;
754
755 if (av->highest_lnum <= aeb->lnum)
756 av->highest_lnum = aeb->lnum;
757
758 assign_aeb_to_av(ai, aeb, av);
759
760 dbg_bld("inserting PEB:%i (LEB %i) to vol %i",
761 aeb->pnum, aeb->lnum, av->vol_id);
762 }
763 }
764
765 ret = scan_pool(ubi, ai, fmpl->pebs, pool_size, &max_sqnum, &free);
766 if (ret)
767 goto fail;
768
769 ret = scan_pool(ubi, ai, fmpl_wl->pebs, wl_pool_size, &max_sqnum, &free);
770 if (ret)
771 goto fail;
772
773 if (max_sqnum > ai->max_sqnum)
774 ai->max_sqnum = max_sqnum;
775
776 list_for_each_entry_safe(tmp_aeb, _tmp_aeb, &free, u.list)
777 list_move_tail(&tmp_aeb->u.list, &ai->free);
778
779 list_for_each_entry_safe(tmp_aeb, _tmp_aeb, &used, u.list)
780 list_move_tail(&tmp_aeb->u.list, &ai->erase);
781
782 ubi_assert(list_empty(&free));
783
784 /*
785 * If fastmap is leaking PEBs (must not happen), raise a
786 * fat warning and fall back to scanning mode.
787 * We do this here because in ubi_wl_init() it's too late
788 * and we cannot fall back to scanning.
789 */
790 if (WARN_ON(count_fastmap_pebs(ai) != ubi->peb_count -
791 ai->bad_peb_count - fm->used_blocks))
792 goto fail_bad;
793
794 return 0;
795
796 fail_bad:
797 ret = UBI_BAD_FASTMAP;
798 fail:
799 list_for_each_entry_safe(tmp_aeb, _tmp_aeb, &used, u.list) {
800 list_del(&tmp_aeb->u.list);
801 ubi_free_aeb(ai, tmp_aeb);
802 }
803 list_for_each_entry_safe(tmp_aeb, _tmp_aeb, &free, u.list) {
804 list_del(&tmp_aeb->u.list);
805 ubi_free_aeb(ai, tmp_aeb);
806 }
807
808 return ret;
809 }
810
811 /**
812 * find_fm_anchor - find the most recent Fastmap superblock (anchor)
813 * @ai: UBI attach info to be filled
814 */
815 static int find_fm_anchor(struct ubi_attach_info *ai)
816 {
817 int ret = -1;
818 struct ubi_ainf_peb *aeb;
819 unsigned long long max_sqnum = 0;
820
821 list_for_each_entry(aeb, &ai->fastmap, u.list) {
822 if (aeb->vol_id == UBI_FM_SB_VOLUME_ID && aeb->sqnum > max_sqnum) {
823 max_sqnum = aeb->sqnum;
824 ret = aeb->pnum;
825 }
826 }
827
828 return ret;
829 }
830
831 /**
832 * ubi_scan_fastmap - scan the fastmap.
833 * @ubi: UBI device object
834 * @ai: UBI attach info to be filled
835 * @scan_ai: UBI attach info from the first 64 PEBs,
836 * used to find the most recent Fastmap data structure
837 *
838 * Returns 0 on success, UBI_NO_FASTMAP if no fastmap was found,
839 * UBI_BAD_FASTMAP if one was found but is not usable.
840 * < 0 indicates an internal error.
841 */
842 int ubi_scan_fastmap(struct ubi_device *ubi, struct ubi_attach_info *ai,
843 struct ubi_attach_info *scan_ai)
844 {
845 struct ubi_fm_sb *fmsb, *fmsb2;
846 struct ubi_vid_io_buf *vb;
847 struct ubi_vid_hdr *vh;
848 struct ubi_ec_hdr *ech;
849 struct ubi_fastmap_layout *fm;
850 struct ubi_ainf_peb *tmp_aeb, *aeb;
851 int i, used_blocks, pnum, fm_anchor, ret = 0;
852 size_t fm_size;
853 __be32 crc, tmp_crc;
854 unsigned long long sqnum = 0;
855
856 fm_anchor = find_fm_anchor(scan_ai);
857 if (fm_anchor < 0)
858 return UBI_NO_FASTMAP;
859
860 /* Move all (possible) fastmap blocks into our new attach structure. */
861 list_for_each_entry_safe(aeb, tmp_aeb, &scan_ai->fastmap, u.list)
862 list_move_tail(&aeb->u.list, &ai->fastmap);
863
864 down_write(&ubi->fm_protect);
865 memset(ubi->fm_buf, 0, ubi->fm_size);
866
867 fmsb = kmalloc(sizeof(*fmsb), GFP_KERNEL);
868 if (!fmsb) {
869 ret = -ENOMEM;
870 goto out;
871 }
872
873 fm = kzalloc(sizeof(*fm), GFP_KERNEL);
874 if (!fm) {
875 ret = -ENOMEM;
876 kfree(fmsb);
877 goto out;
878 }
879
880 ret = ubi_io_read_data(ubi, fmsb, fm_anchor, 0, sizeof(*fmsb));
881 if (ret && ret != UBI_IO_BITFLIPS)
882 goto free_fm_sb;
883 else if (ret == UBI_IO_BITFLIPS)
884 fm->to_be_tortured[0] = 1;
885
886 if (be32_to_cpu(fmsb->magic) != UBI_FM_SB_MAGIC) {
887 ubi_err(ubi, "bad super block magic: 0x%x, expected: 0x%x",
888 be32_to_cpu(fmsb->magic), UBI_FM_SB_MAGIC);
889 ret = UBI_BAD_FASTMAP;
890 goto free_fm_sb;
891 }
892
893 if (fmsb->version != UBI_FM_FMT_VERSION) {
894 ubi_err(ubi, "bad fastmap version: %i, expected: %i",
895 fmsb->version, UBI_FM_FMT_VERSION);
896 ret = UBI_BAD_FASTMAP;
897 goto free_fm_sb;
898 }
899
900 used_blocks = be32_to_cpu(fmsb->used_blocks);
901 if (used_blocks > UBI_FM_MAX_BLOCKS || used_blocks < 1) {
902 ubi_err(ubi, "number of fastmap blocks is invalid: %i",
903 used_blocks);
904 ret = UBI_BAD_FASTMAP;
905 goto free_fm_sb;
906 }
907
908 fm_size = ubi->leb_size * used_blocks;
909 if (fm_size != ubi->fm_size) {
910 ubi_err(ubi, "bad fastmap size: %zi, expected: %zi",
911 fm_size, ubi->fm_size);
912 ret = UBI_BAD_FASTMAP;
913 goto free_fm_sb;
914 }
915
916 ech = kzalloc(ubi->ec_hdr_alsize, GFP_KERNEL);
917 if (!ech) {
918 ret = -ENOMEM;
919 goto free_fm_sb;
920 }
921
922 vb = ubi_alloc_vid_buf(ubi, GFP_KERNEL);
923 if (!vb) {
924 ret = -ENOMEM;
925 goto free_hdr;
926 }
927
928 vh = ubi_get_vid_hdr(vb);
929
930 for (i = 0; i < used_blocks; i++) {
931 int image_seq;
932
933 pnum = be32_to_cpu(fmsb->block_loc[i]);
934
935 if (ubi_io_is_bad(ubi, pnum)) {
936 ret = UBI_BAD_FASTMAP;
937 goto free_hdr;
938 }
939
940 if (i == 0 && pnum != fm_anchor) {
941 ubi_err(ubi, "Fastmap anchor PEB mismatch: PEB: %i vs. %i",
942 pnum, fm_anchor);
943 ret = UBI_BAD_FASTMAP;
944 goto free_hdr;
945 }
946
947 ret = ubi_io_read_ec_hdr(ubi, pnum, ech, 0);
948 if (ret && ret != UBI_IO_BITFLIPS) {
949 ubi_err(ubi, "unable to read fastmap block# %i EC (PEB: %i)",
950 i, pnum);
951 if (ret > 0)
952 ret = UBI_BAD_FASTMAP;
953 goto free_hdr;
954 } else if (ret == UBI_IO_BITFLIPS)
955 fm->to_be_tortured[i] = 1;
956
957 image_seq = be32_to_cpu(ech->image_seq);
958 if (!ubi->image_seq)
959 ubi->image_seq = image_seq;
960
961 /*
962 * Older UBI implementations have image_seq set to zero, so
963 * we shouldn't fail if image_seq == 0.
964 */
965 if (image_seq && (image_seq != ubi->image_seq)) {
966 ubi_err(ubi, "wrong image seq:%d instead of %d",
967 be32_to_cpu(ech->image_seq), ubi->image_seq);
968 ret = UBI_BAD_FASTMAP;
969 goto free_hdr;
970 }
971
972 ret = ubi_io_read_vid_hdr(ubi, pnum, vb, 0);
973 if (ret && ret != UBI_IO_BITFLIPS) {
974 ubi_err(ubi, "unable to read fastmap block# %i (PEB: %i)",
975 i, pnum);
976 goto free_hdr;
977 }
978
979 if (i == 0) {
980 if (be32_to_cpu(vh->vol_id) != UBI_FM_SB_VOLUME_ID) {
981 ubi_err(ubi, "bad fastmap anchor vol_id: 0x%x, expected: 0x%x",
982 be32_to_cpu(vh->vol_id),
983 UBI_FM_SB_VOLUME_ID);
984 ret = UBI_BAD_FASTMAP;
985 goto free_hdr;
986 }
987 } else {
988 if (be32_to_cpu(vh->vol_id) != UBI_FM_DATA_VOLUME_ID) {
989 ubi_err(ubi, "bad fastmap data vol_id: 0x%x, expected: 0x%x",
990 be32_to_cpu(vh->vol_id),
991 UBI_FM_DATA_VOLUME_ID);
992 ret = UBI_BAD_FASTMAP;
993 goto free_hdr;
994 }
995 }
996
997 if (sqnum < be64_to_cpu(vh->sqnum))
998 sqnum = be64_to_cpu(vh->sqnum);
999
1000 ret = ubi_io_read_data(ubi, ubi->fm_buf + (ubi->leb_size * i),
1001 pnum, 0, ubi->leb_size);
1002 if (ret && ret != UBI_IO_BITFLIPS) {
1003 ubi_err(ubi, "unable to read fastmap block# %i (PEB: %i, "
1004 "err: %i)", i, pnum, ret);
1005 goto free_hdr;
1006 }
1007 }
1008
1009 kfree(fmsb);
1010 fmsb = NULL;
1011
1012 fmsb2 = (struct ubi_fm_sb *)(ubi->fm_buf);
1013 tmp_crc = be32_to_cpu(fmsb2->data_crc);
1014 fmsb2->data_crc = 0;
1015 crc = crc32(UBI_CRC32_INIT, ubi->fm_buf, fm_size);
1016 if (crc != tmp_crc) {
1017 ubi_err(ubi, "fastmap data CRC is invalid");
1018 ubi_err(ubi, "CRC should be: 0x%x, calc: 0x%x",
1019 tmp_crc, crc);
1020 ret = UBI_BAD_FASTMAP;
1021 goto free_hdr;
1022 }
1023
1024 fmsb2->sqnum = sqnum;
1025
1026 fm->used_blocks = used_blocks;
1027
1028 ret = ubi_attach_fastmap(ubi, ai, fm);
1029 if (ret) {
1030 if (ret > 0)
1031 ret = UBI_BAD_FASTMAP;
1032 goto free_hdr;
1033 }
1034
1035 for (i = 0; i < used_blocks; i++) {
1036 struct ubi_wl_entry *e;
1037
1038 e = kmem_cache_alloc(ubi_wl_entry_slab, GFP_KERNEL);
1039 if (!e) {
1040 while (i--)
1041 kfree(fm->e[i]);
1042
1043 ret = -ENOMEM;
1044 goto free_hdr;
1045 }
1046
1047 e->pnum = be32_to_cpu(fmsb2->block_loc[i]);
1048 e->ec = be32_to_cpu(fmsb2->block_ec[i]);
1049 fm->e[i] = e;
1050 }
1051
1052 ubi->fm = fm;
1053 ubi->fm_pool.max_size = ubi->fm->max_pool_size;
1054 ubi->fm_wl_pool.max_size = ubi->fm->max_wl_pool_size;
1055 ubi_msg(ubi, "attached by fastmap");
1056 ubi_msg(ubi, "fastmap pool size: %d", ubi->fm_pool.max_size);
1057 ubi_msg(ubi, "fastmap WL pool size: %d",
1058 ubi->fm_wl_pool.max_size);
1059 ubi->fm_disabled = 0;
1060 ubi->fast_attach = 1;
1061
1062 ubi_free_vid_buf(vb);
1063 kfree(ech);
1064 out:
1065 up_write(&ubi->fm_protect);
1066 if (ret == UBI_BAD_FASTMAP)
1067 ubi_err(ubi, "Attach by fastmap failed, doing a full scan!");
1068 return ret;
1069
1070 free_hdr:
1071 ubi_free_vid_buf(vb);
1072 kfree(ech);
1073 free_fm_sb:
1074 kfree(fmsb);
1075 kfree(fm);
1076 goto out;
1077 }
1078
1079 /**
1080 * ubi_write_fastmap - writes a fastmap.
1081 * @ubi: UBI device object
1082 * @new_fm: the to be written fastmap
1083 *
1084 * Returns 0 on success, < 0 indicates an internal error.
1085 */
1086 static int ubi_write_fastmap(struct ubi_device *ubi,
1087 struct ubi_fastmap_layout *new_fm)
1088 {
1089 size_t fm_pos = 0;
1090 void *fm_raw;
1091 struct ubi_fm_sb *fmsb;
1092 struct ubi_fm_hdr *fmh;
1093 struct ubi_fm_scan_pool *fmpl, *fmpl_wl;
1094 struct ubi_fm_ec *fec;
1095 struct ubi_fm_volhdr *fvh;
1096 struct ubi_fm_eba *feba;
1097 struct ubi_wl_entry *wl_e;
1098 struct ubi_volume *vol;
1099 struct ubi_vid_io_buf *avbuf, *dvbuf;
1100 struct ubi_vid_hdr *avhdr, *dvhdr;
1101 struct ubi_work *ubi_wrk;
1102 struct rb_node *tmp_rb;
1103 int ret, i, j, free_peb_count, used_peb_count, vol_count;
1104 int scrub_peb_count, erase_peb_count;
1105 unsigned long *seen_pebs = NULL;
1106
1107 fm_raw = ubi->fm_buf;
1108 memset(ubi->fm_buf, 0, ubi->fm_size);
1109
1110 avbuf = new_fm_vbuf(ubi, UBI_FM_SB_VOLUME_ID);
1111 if (!avbuf) {
1112 ret = -ENOMEM;
1113 goto out;
1114 }
1115
1116 dvbuf = new_fm_vbuf(ubi, UBI_FM_DATA_VOLUME_ID);
1117 if (!dvbuf) {
1118 ret = -ENOMEM;
1119 goto out_kfree;
1120 }
1121
1122 avhdr = ubi_get_vid_hdr(avbuf);
1123 dvhdr = ubi_get_vid_hdr(dvbuf);
1124
1125 seen_pebs = init_seen(ubi);
1126 if (IS_ERR(seen_pebs)) {
1127 ret = PTR_ERR(seen_pebs);
1128 goto out_kfree;
1129 }
1130
1131 spin_lock(&ubi->volumes_lock);
1132 spin_lock(&ubi->wl_lock);
1133
1134 fmsb = (struct ubi_fm_sb *)fm_raw;
1135 fm_pos += sizeof(*fmsb);
1136 ubi_assert(fm_pos <= ubi->fm_size);
1137
1138 fmh = (struct ubi_fm_hdr *)(fm_raw + fm_pos);
1139 fm_pos += sizeof(*fmh);
1140 ubi_assert(fm_pos <= ubi->fm_size);
1141
1142 fmsb->magic = cpu_to_be32(UBI_FM_SB_MAGIC);
1143 fmsb->version = UBI_FM_FMT_VERSION;
1144 fmsb->used_blocks = cpu_to_be32(new_fm->used_blocks);
1145 /* the max sqnum will be filled in while *reading* the fastmap */
1146 fmsb->sqnum = 0;
1147
1148 fmh->magic = cpu_to_be32(UBI_FM_HDR_MAGIC);
1149 free_peb_count = 0;
1150 used_peb_count = 0;
1151 scrub_peb_count = 0;
1152 erase_peb_count = 0;
1153 vol_count = 0;
1154
1155 fmpl = (struct ubi_fm_scan_pool *)(fm_raw + fm_pos);
1156 fm_pos += sizeof(*fmpl);
1157 fmpl->magic = cpu_to_be32(UBI_FM_POOL_MAGIC);
1158 fmpl->size = cpu_to_be16(ubi->fm_pool.size);
1159 fmpl->max_size = cpu_to_be16(ubi->fm_pool.max_size);
1160
1161 for (i = 0; i < ubi->fm_pool.size; i++) {
1162 fmpl->pebs[i] = cpu_to_be32(ubi->fm_pool.pebs[i]);
1163 set_seen(ubi, ubi->fm_pool.pebs[i], seen_pebs);
1164 }
1165
1166 fmpl_wl = (struct ubi_fm_scan_pool *)(fm_raw + fm_pos);
1167 fm_pos += sizeof(*fmpl_wl);
1168 fmpl_wl->magic = cpu_to_be32(UBI_FM_POOL_MAGIC);
1169 fmpl_wl->size = cpu_to_be16(ubi->fm_wl_pool.size);
1170 fmpl_wl->max_size = cpu_to_be16(ubi->fm_wl_pool.max_size);
1171
1172 for (i = 0; i < ubi->fm_wl_pool.size; i++) {
1173 fmpl_wl->pebs[i] = cpu_to_be32(ubi->fm_wl_pool.pebs[i]);
1174 set_seen(ubi, ubi->fm_wl_pool.pebs[i], seen_pebs);
1175 }
1176
1177 ubi_for_each_free_peb(ubi, wl_e, tmp_rb) {
1178 fec = (struct ubi_fm_ec *)(fm_raw + fm_pos);
1179
1180 fec->pnum = cpu_to_be32(wl_e->pnum);
1181 set_seen(ubi, wl_e->pnum, seen_pebs);
1182 fec->ec = cpu_to_be32(wl_e->ec);
1183
1184 free_peb_count++;
1185 fm_pos += sizeof(*fec);
1186 ubi_assert(fm_pos <= ubi->fm_size);
1187 }
1188 fmh->free_peb_count = cpu_to_be32(free_peb_count);
1189
1190 ubi_for_each_used_peb(ubi, wl_e, tmp_rb) {
1191 fec = (struct ubi_fm_ec *)(fm_raw + fm_pos);
1192
1193 fec->pnum = cpu_to_be32(wl_e->pnum);
1194 set_seen(ubi, wl_e->pnum, seen_pebs);
1195 fec->ec = cpu_to_be32(wl_e->ec);
1196
1197 used_peb_count++;
1198 fm_pos += sizeof(*fec);
1199 ubi_assert(fm_pos <= ubi->fm_size);
1200 }
1201
1202 ubi_for_each_protected_peb(ubi, i, wl_e) {
1203 fec = (struct ubi_fm_ec *)(fm_raw + fm_pos);
1204
1205 fec->pnum = cpu_to_be32(wl_e->pnum);
1206 set_seen(ubi, wl_e->pnum, seen_pebs);
1207 fec->ec = cpu_to_be32(wl_e->ec);
1208
1209 used_peb_count++;
1210 fm_pos += sizeof(*fec);
1211 ubi_assert(fm_pos <= ubi->fm_size);
1212 }
1213 fmh->used_peb_count = cpu_to_be32(used_peb_count);
1214
1215 ubi_for_each_scrub_peb(ubi, wl_e, tmp_rb) {
1216 fec = (struct ubi_fm_ec *)(fm_raw + fm_pos);
1217
1218 fec->pnum = cpu_to_be32(wl_e->pnum);
1219 set_seen(ubi, wl_e->pnum, seen_pebs);
1220 fec->ec = cpu_to_be32(wl_e->ec);
1221
1222 scrub_peb_count++;
1223 fm_pos += sizeof(*fec);
1224 ubi_assert(fm_pos <= ubi->fm_size);
1225 }
1226 fmh->scrub_peb_count = cpu_to_be32(scrub_peb_count);
1227
1228
1229 list_for_each_entry(ubi_wrk, &ubi->works, list) {
1230 if (ubi_is_erase_work(ubi_wrk)) {
1231 wl_e = ubi_wrk->e;
1232 ubi_assert(wl_e);
1233
1234 fec = (struct ubi_fm_ec *)(fm_raw + fm_pos);
1235
1236 fec->pnum = cpu_to_be32(wl_e->pnum);
1237 set_seen(ubi, wl_e->pnum, seen_pebs);
1238 fec->ec = cpu_to_be32(wl_e->ec);
1239
1240 erase_peb_count++;
1241 fm_pos += sizeof(*fec);
1242 ubi_assert(fm_pos <= ubi->fm_size);
1243 }
1244 }
1245 fmh->erase_peb_count = cpu_to_be32(erase_peb_count);
1246
1247 for (i = 0; i < UBI_MAX_VOLUMES + UBI_INT_VOL_COUNT; i++) {
1248 vol = ubi->volumes[i];
1249
1250 if (!vol)
1251 continue;
1252
1253 vol_count++;
1254
1255 fvh = (struct ubi_fm_volhdr *)(fm_raw + fm_pos);
1256 fm_pos += sizeof(*fvh);
1257 ubi_assert(fm_pos <= ubi->fm_size);
1258
1259 fvh->magic = cpu_to_be32(UBI_FM_VHDR_MAGIC);
1260 fvh->vol_id = cpu_to_be32(vol->vol_id);
1261 fvh->vol_type = vol->vol_type;
1262 fvh->used_ebs = cpu_to_be32(vol->used_ebs);
1263 fvh->data_pad = cpu_to_be32(vol->data_pad);
1264 fvh->last_eb_bytes = cpu_to_be32(vol->last_eb_bytes);
1265
1266 ubi_assert(vol->vol_type == UBI_DYNAMIC_VOLUME ||
1267 vol->vol_type == UBI_STATIC_VOLUME);
1268
1269 feba = (struct ubi_fm_eba *)(fm_raw + fm_pos);
1270 fm_pos += sizeof(*feba) + (sizeof(__be32) * vol->reserved_pebs);
1271 ubi_assert(fm_pos <= ubi->fm_size);
1272
1273 for (j = 0; j < vol->reserved_pebs; j++) {
1274 struct ubi_eba_leb_desc ldesc;
1275
1276 ubi_eba_get_ldesc(vol, j, &ldesc);
1277 feba->pnum[j] = cpu_to_be32(ldesc.pnum);
1278 }
1279
1280 feba->reserved_pebs = cpu_to_be32(j);
1281 feba->magic = cpu_to_be32(UBI_FM_EBA_MAGIC);
1282 }
1283 fmh->vol_count = cpu_to_be32(vol_count);
1284 fmh->bad_peb_count = cpu_to_be32(ubi->bad_peb_count);
1285
1286 avhdr->sqnum = cpu_to_be64(ubi_next_sqnum(ubi));
1287 avhdr->lnum = 0;
1288
1289 spin_unlock(&ubi->wl_lock);
1290 spin_unlock(&ubi->volumes_lock);
1291
1292 dbg_bld("writing fastmap SB to PEB %i", new_fm->e[0]->pnum);
1293 ret = ubi_io_write_vid_hdr(ubi, new_fm->e[0]->pnum, avbuf);
1294 if (ret) {
1295 ubi_err(ubi, "unable to write vid_hdr to fastmap SB!");
1296 goto out_kfree;
1297 }
1298
1299 for (i = 0; i < new_fm->used_blocks; i++) {
1300 fmsb->block_loc[i] = cpu_to_be32(new_fm->e[i]->pnum);
1301 set_seen(ubi, new_fm->e[i]->pnum, seen_pebs);
1302 fmsb->block_ec[i] = cpu_to_be32(new_fm->e[i]->ec);
1303 }
1304
1305 fmsb->data_crc = 0;
1306 fmsb->data_crc = cpu_to_be32(crc32(UBI_CRC32_INIT, fm_raw,
1307 ubi->fm_size));
1308
1309 for (i = 1; i < new_fm->used_blocks; i++) {
1310 dvhdr->sqnum = cpu_to_be64(ubi_next_sqnum(ubi));
1311 dvhdr->lnum = cpu_to_be32(i);
1312 dbg_bld("writing fastmap data to PEB %i sqnum %llu",
1313 new_fm->e[i]->pnum, be64_to_cpu(dvhdr->sqnum));
1314 ret = ubi_io_write_vid_hdr(ubi, new_fm->e[i]->pnum, dvbuf);
1315 if (ret) {
1316 ubi_err(ubi, "unable to write vid_hdr to PEB %i!",
1317 new_fm->e[i]->pnum);
1318 goto out_kfree;
1319 }
1320 }
1321
1322 for (i = 0; i < new_fm->used_blocks; i++) {
1323 ret = ubi_io_write_data(ubi, fm_raw + (i * ubi->leb_size),
1324 new_fm->e[i]->pnum, 0, ubi->leb_size);
1325 if (ret) {
1326 ubi_err(ubi, "unable to write fastmap to PEB %i!",
1327 new_fm->e[i]->pnum);
1328 goto out_kfree;
1329 }
1330 }
1331
1332 ubi_assert(new_fm);
1333 ubi->fm = new_fm;
1334
1335 ret = self_check_seen(ubi, seen_pebs);
1336 dbg_bld("fastmap written!");
1337
1338 out_kfree:
1339 ubi_free_vid_buf(avbuf);
1340 ubi_free_vid_buf(dvbuf);
1341 free_seen(seen_pebs);
1342 out:
1343 return ret;
1344 }
1345
1346 /**
1347 * erase_block - Manually erase a PEB.
1348 * @ubi: UBI device object
1349 * @pnum: PEB to be erased
1350 *
1351 * Returns the new EC value on success, < 0 indicates an internal error.
1352 */
1353 static int erase_block(struct ubi_device *ubi, int pnum)
1354 {
1355 int ret;
1356 struct ubi_ec_hdr *ec_hdr;
1357 long long ec;
1358
1359 ec_hdr = kzalloc(ubi->ec_hdr_alsize, GFP_KERNEL);
1360 if (!ec_hdr)
1361 return -ENOMEM;
1362
1363 ret = ubi_io_read_ec_hdr(ubi, pnum, ec_hdr, 0);
1364 if (ret < 0)
1365 goto out;
1366 else if (ret && ret != UBI_IO_BITFLIPS) {
1367 ret = -EINVAL;
1368 goto out;
1369 }
1370
1371 ret = ubi_io_sync_erase(ubi, pnum, 0);
1372 if (ret < 0)
1373 goto out;
1374
1375 ec = be64_to_cpu(ec_hdr->ec);
1376 ec += ret;
1377 if (ec > UBI_MAX_ERASECOUNTER) {
1378 ret = -EINVAL;
1379 goto out;
1380 }
1381
1382 ec_hdr->ec = cpu_to_be64(ec);
1383 ret = ubi_io_write_ec_hdr(ubi, pnum, ec_hdr);
1384 if (ret < 0)
1385 goto out;
1386
1387 ret = ec;
1388 out:
1389 kfree(ec_hdr);
1390 return ret;
1391 }
1392
1393 /**
1394 * invalidate_fastmap - destroys a fastmap.
1395 * @ubi: UBI device object
1396 *
1397 * This function ensures that upon next UBI attach a full scan
1398 * is issued. We need this if UBI is about to write a new fastmap
1399 * but is unable to do so. In this case we have two options:
1400 * a) Make sure that the current fastmap will not be usued upon
1401 * attach time and contine or b) fall back to RO mode to have the
1402 * current fastmap in a valid state.
1403 * Returns 0 on success, < 0 indicates an internal error.
1404 */
1405 static int invalidate_fastmap(struct ubi_device *ubi)
1406 {
1407 int ret;
1408 struct ubi_fastmap_layout *fm;
1409 struct ubi_wl_entry *e;
1410 struct ubi_vid_io_buf *vb = NULL;
1411 struct ubi_vid_hdr *vh;
1412
1413 if (!ubi->fm)
1414 return 0;
1415
1416 ubi->fm = NULL;
1417
1418 ret = -ENOMEM;
1419 fm = kzalloc(sizeof(*fm), GFP_KERNEL);
1420 if (!fm)
1421 goto out;
1422
1423 vb = new_fm_vbuf(ubi, UBI_FM_SB_VOLUME_ID);
1424 if (!vb)
1425 goto out_free_fm;
1426
1427 vh = ubi_get_vid_hdr(vb);
1428
1429 ret = -ENOSPC;
1430 e = ubi_wl_get_fm_peb(ubi, 1);
1431 if (!e)
1432 goto out_free_fm;
1433
1434 /*
1435 * Create fake fastmap such that UBI will fall back
1436 * to scanning mode.
1437 */
1438 vh->sqnum = cpu_to_be64(ubi_next_sqnum(ubi));
1439 ret = ubi_io_write_vid_hdr(ubi, e->pnum, vb);
1440 if (ret < 0) {
1441 ubi_wl_put_fm_peb(ubi, e, 0, 0);
1442 goto out_free_fm;
1443 }
1444
1445 fm->used_blocks = 1;
1446 fm->e[0] = e;
1447
1448 ubi->fm = fm;
1449
1450 out:
1451 ubi_free_vid_buf(vb);
1452 return ret;
1453
1454 out_free_fm:
1455 kfree(fm);
1456 goto out;
1457 }
1458
1459 /**
1460 * return_fm_pebs - returns all PEBs used by a fastmap back to the
1461 * WL sub-system.
1462 * @ubi: UBI device object
1463 * @fm: fastmap layout object
1464 */
1465 static void return_fm_pebs(struct ubi_device *ubi,
1466 struct ubi_fastmap_layout *fm)
1467 {
1468 int i;
1469
1470 if (!fm)
1471 return;
1472
1473 for (i = 0; i < fm->used_blocks; i++) {
1474 if (fm->e[i]) {
1475 ubi_wl_put_fm_peb(ubi, fm->e[i], i,
1476 fm->to_be_tortured[i]);
1477 fm->e[i] = NULL;
1478 }
1479 }
1480 }
1481
1482 /**
1483 * ubi_update_fastmap - will be called by UBI if a volume changes or
1484 * a fastmap pool becomes full.
1485 * @ubi: UBI device object
1486 *
1487 * Returns 0 on success, < 0 indicates an internal error.
1488 */
1489 int ubi_update_fastmap(struct ubi_device *ubi)
1490 {
1491 int ret, i, j;
1492 struct ubi_fastmap_layout *new_fm, *old_fm;
1493 struct ubi_wl_entry *tmp_e;
1494
1495 down_write(&ubi->fm_protect);
1496 down_write(&ubi->work_sem);
1497 down_write(&ubi->fm_eba_sem);
1498
1499 ubi_refill_pools(ubi);
1500
1501 if (ubi->ro_mode || ubi->fm_disabled) {
1502 up_write(&ubi->fm_eba_sem);
1503 up_write(&ubi->work_sem);
1504 up_write(&ubi->fm_protect);
1505 return 0;
1506 }
1507
1508 ret = ubi_ensure_anchor_pebs(ubi);
1509 if (ret) {
1510 up_write(&ubi->fm_eba_sem);
1511 up_write(&ubi->work_sem);
1512 up_write(&ubi->fm_protect);
1513 return ret;
1514 }
1515
1516 new_fm = kzalloc(sizeof(*new_fm), GFP_KERNEL);
1517 if (!new_fm) {
1518 up_write(&ubi->fm_eba_sem);
1519 up_write(&ubi->work_sem);
1520 up_write(&ubi->fm_protect);
1521 return -ENOMEM;
1522 }
1523
1524 new_fm->used_blocks = ubi->fm_size / ubi->leb_size;
1525 old_fm = ubi->fm;
1526 ubi->fm = NULL;
1527
1528 if (new_fm->used_blocks > UBI_FM_MAX_BLOCKS) {
1529 ubi_err(ubi, "fastmap too large");
1530 ret = -ENOSPC;
1531 goto err;
1532 }
1533
1534 for (i = 1; i < new_fm->used_blocks; i++) {
1535 spin_lock(&ubi->wl_lock);
1536 tmp_e = ubi_wl_get_fm_peb(ubi, 0);
1537 spin_unlock(&ubi->wl_lock);
1538
1539 if (!tmp_e) {
1540 if (old_fm && old_fm->e[i]) {
1541 ret = erase_block(ubi, old_fm->e[i]->pnum);
1542 if (ret < 0) {
1543 ubi_err(ubi, "could not erase old fastmap PEB");
1544
1545 for (j = 1; j < i; j++) {
1546 ubi_wl_put_fm_peb(ubi, new_fm->e[j],
1547 j, 0);
1548 new_fm->e[j] = NULL;
1549 }
1550 goto err;
1551 }
1552 new_fm->e[i] = old_fm->e[i];
1553 old_fm->e[i] = NULL;
1554 } else {
1555 ubi_err(ubi, "could not get any free erase block");
1556
1557 for (j = 1; j < i; j++) {
1558 ubi_wl_put_fm_peb(ubi, new_fm->e[j], j, 0);
1559 new_fm->e[j] = NULL;
1560 }
1561
1562 ret = -ENOSPC;
1563 goto err;
1564 }
1565 } else {
1566 new_fm->e[i] = tmp_e;
1567
1568 if (old_fm && old_fm->e[i]) {
1569 ubi_wl_put_fm_peb(ubi, old_fm->e[i], i,
1570 old_fm->to_be_tortured[i]);
1571 old_fm->e[i] = NULL;
1572 }
1573 }
1574 }
1575
1576 /* Old fastmap is larger than the new one */
1577 if (old_fm && new_fm->used_blocks < old_fm->used_blocks) {
1578 for (i = new_fm->used_blocks; i < old_fm->used_blocks; i++) {
1579 ubi_wl_put_fm_peb(ubi, old_fm->e[i], i,
1580 old_fm->to_be_tortured[i]);
1581 old_fm->e[i] = NULL;
1582 }
1583 }
1584
1585 spin_lock(&ubi->wl_lock);
1586 tmp_e = ubi_wl_get_fm_peb(ubi, 1);
1587 spin_unlock(&ubi->wl_lock);
1588
1589 if (old_fm) {
1590 /* no fresh anchor PEB was found, reuse the old one */
1591 if (!tmp_e) {
1592 ret = erase_block(ubi, old_fm->e[0]->pnum);
1593 if (ret < 0) {
1594 ubi_err(ubi, "could not erase old anchor PEB");
1595
1596 for (i = 1; i < new_fm->used_blocks; i++) {
1597 ubi_wl_put_fm_peb(ubi, new_fm->e[i],
1598 i, 0);
1599 new_fm->e[i] = NULL;
1600 }
1601 goto err;
1602 }
1603 new_fm->e[0] = old_fm->e[0];
1604 new_fm->e[0]->ec = ret;
1605 old_fm->e[0] = NULL;
1606 } else {
1607 /* we've got a new anchor PEB, return the old one */
1608 ubi_wl_put_fm_peb(ubi, old_fm->e[0], 0,
1609 old_fm->to_be_tortured[0]);
1610 new_fm->e[0] = tmp_e;
1611 old_fm->e[0] = NULL;
1612 }
1613 } else {
1614 if (!tmp_e) {
1615 ubi_err(ubi, "could not find any anchor PEB");
1616
1617 for (i = 1; i < new_fm->used_blocks; i++) {
1618 ubi_wl_put_fm_peb(ubi, new_fm->e[i], i, 0);
1619 new_fm->e[i] = NULL;
1620 }
1621
1622 ret = -ENOSPC;
1623 goto err;
1624 }
1625 new_fm->e[0] = tmp_e;
1626 }
1627
1628 ret = ubi_write_fastmap(ubi, new_fm);
1629
1630 if (ret)
1631 goto err;
1632
1633 out_unlock:
1634 up_write(&ubi->fm_eba_sem);
1635 up_write(&ubi->work_sem);
1636 up_write(&ubi->fm_protect);
1637 kfree(old_fm);
1638 return ret;
1639
1640 err:
1641 ubi_warn(ubi, "Unable to write new fastmap, err=%i", ret);
1642
1643 ret = invalidate_fastmap(ubi);
1644 if (ret < 0) {
1645 ubi_err(ubi, "Unable to invalidiate current fastmap!");
1646 ubi_ro_mode(ubi);
1647 } else {
1648 return_fm_pebs(ubi, old_fm);
1649 return_fm_pebs(ubi, new_fm);
1650 ret = 0;
1651 }
1652
1653 kfree(new_fm);
1654 goto out_unlock;
1655 }
Linux with added FPC-III support