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ubi: Fix races around ubi_refill_pools()
[mirror_ubuntu-artful-kernel.git] / drivers / mtd / ubi / fastmap.c
CommitLineData
dbb7d2a8
RW		 1/*
2 * Copyright (c) 2012 Linutronix GmbH
daef3dd1 3 * Copyright (c) 2014 sigma star gmbh
dbb7d2a8
RW		 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>
5d71afb0 18#include <linux/bitmap.h>
dbb7d2a8
RW		 19#include "ubi.h"
20
daef3dd1
RW		 21/**
22 * init_seen - allocate memory for used for debugging.
23 * @ubi: UBI device description object
24 */
5d71afb0 25static inline unsigned long *init_seen(struct ubi_device *ubi)
daef3dd1 26{
5d71afb0 27 unsigned long *ret;
daef3dd1
RW		 28
29 if (!ubi_dbg_chk_fastmap(ubi))
30 return NULL;
31
5d71afb0
RW		 32 ret = kcalloc(BITS_TO_LONGS(ubi->peb_count), sizeof(unsigned long),
33 GFP_KERNEL);
daef3dd1
RW		 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 */
5d71afb0 44static inline void free_seen(unsigned long *seen)
daef3dd1
RW		 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 */
5d71afb0 55static inline void set_seen(struct ubi_device *ubi, int pnum, unsigned long *seen)
daef3dd1
RW		 56{
57 if (!ubi_dbg_chk_fastmap(ubi) || !seen)
58 return;
59
5d71afb0 60 set_bit(pnum, seen);
daef3dd1
RW		 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 */
5d71afb0 68static int self_check_seen(struct ubi_device *ubi, unsigned long *seen)
daef3dd1
RW		 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++) {
5d71afb0 76 if (test_bit(pnum, seen) && ubi->lookuptbl[pnum]) {
daef3dd1
RW		 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
dbb7d2a8
RW		 85/**
86 * ubi_calc_fm_size - calculates the fastmap size in bytes for an UBI device.
87 * @ubi: UBI device description object
88 */
89size_t ubi_calc_fm_size(struct ubi_device *ubi)
90{
91 size_t size;
92
a18fd672 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))) +
dbb7d2a8
RW		 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 */
3291b52f 113static struct ubi_vid_io_buf *new_fm_vbuf(struct ubi_device *ubi, int vol_id)
dbb7d2a8 114{
3291b52f
BB		 115 struct ubi_vid_io_buf *new;
116 struct ubi_vid_hdr *vh;
dbb7d2a8 117
3291b52f 118 new = ubi_alloc_vid_buf(ubi, GFP_KERNEL);
dbb7d2a8
RW		 119 if (!new)
120 goto out;
121
3291b52f
BB		 122 vh = ubi_get_vid_hdr(new);
123 vh->vol_type = UBI_VID_DYNAMIC;
124 vh->vol_id = cpu_to_be32(vol_id);
dbb7d2a8
RW		 125
126 /* UBI implementations without fastmap support have to delete the
127 * fastmap.
128 */
3291b52f 129 vh->compat = UBI_COMPAT_DELETE;
dbb7d2a8
RW		 130
131out:
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 */
145static 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
91f4285f 150 aeb = ubi_alloc_aeb(ai, pnum, ec);
dbb7d2a8
RW		 151 if (!aeb)
152 return -ENOMEM;
153
dbb7d2a8
RW		 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 */
184static 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;
dbb7d2a8 189
de4c455b
BB		 190 av = ubi_add_av(ai, vol_id);
191 if (IS_ERR(av))
192 return av;
dbb7d2a8 193
dbb7d2a8
RW		 194 av->data_pad = data_pad;
195 av->last_data_size = last_eb_bytes;
196 av->compat = 0;
197 av->vol_type = vol_type;
42dd3cdc
RW		 198 if (av->vol_type == UBI_STATIC_VOLUME)
199 av->used_ebs = used_ebs;
dbb7d2a8
RW		 200
201 dbg_bld("found volume (ID %i)", vol_id);
dbb7d2a8
RW		 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 */
212static 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 */
252static 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);
91f4285f 279 ubi_free_aeb(ai, new_aeb);
dbb7d2a8
RW		 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) {
91f4285f 290 victim = ubi_alloc_aeb(ai, aeb->ec, aeb->pnum);
dbb7d2a8
RW		 291 if (!victim)
292 return -ENOMEM;
293
dbb7d2a8
RW		 294 list_add_tail(&victim->u.list, &ai->erase);
295
296 if (av->highest_lnum == be32_to_cpu(new_vh->lnum))
669d3d12 297 av->last_data_size =
dbb7d2a8
RW		 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;
91f4285f 307 ubi_free_aeb(ai, new_aeb);
dbb7d2a8
RW		 308
309 /* new_aeb is older */
310 } else {
311 dbg_bld("vol %i: AEB %i's PEB %i is old, dropping it",
312 av->vol_id, aeb->lnum, new_aeb->pnum);
313 list_add_tail(&new_aeb->u.list, &ai->erase);
314 }
315
316 return 0;
317 }
318 /* This LEB is new, let's add it to the volume */
319
320 if (av->highest_lnum <= be32_to_cpu(new_vh->lnum)) {
321 av->highest_lnum = be32_to_cpu(new_vh->lnum);
322 av->last_data_size = be32_to_cpu(new_vh->data_size);
323 }
324
325 if (av->vol_type == UBI_STATIC_VOLUME)
326 av->used_ebs = be32_to_cpu(new_vh->used_ebs);
327
328 av->leb_count++;
329
330 rb_link_node(&new_aeb->u.rb, parent, p);
331 rb_insert_color(&new_aeb->u.rb, &av->root);
332
333 return 0;
334}
335
336/**
337 * process_pool_aeb - we found a non-empty PEB in a pool.
338 * @ubi: UBI device object
339 * @ai: attach info object
340 * @new_vh: the volume header derived from new_aeb
341 * @new_aeb: the AEB to be examined
342 *
343 * Returns 0 on success, < 0 indicates an internal error.
344 */
345static int process_pool_aeb(struct ubi_device *ubi, struct ubi_attach_info *ai,
346 struct ubi_vid_hdr *new_vh,
347 struct ubi_ainf_peb *new_aeb)
348{
4c368421 349 int vol_id = be32_to_cpu(new_vh->vol_id);
f5f9d43f 350 struct ubi_ainf_volume *av;
dbb7d2a8 351
4c368421 352 if (vol_id == UBI_FM_SB_VOLUME_ID || vol_id == UBI_FM_DATA_VOLUME_ID) {
91f4285f 353 ubi_free_aeb(ai, new_aeb);
dbb7d2a8
RW		 354
355 return 0;
356 }
357
358 /* Find the volume this SEB belongs to */
4c368421 359 av = ubi_find_av(ai, vol_id);
f5f9d43f 360 if (!av) {
32608703 361 ubi_err(ubi, "orphaned volume in fastmap pool!");
91f4285f 362 ubi_free_aeb(ai, new_aeb);
dbb7d2a8
RW		 363 return UBI_BAD_FASTMAP;
364 }
365
4c368421 366 ubi_assert(vol_id == av->vol_id);
dbb7d2a8
RW		 367
368 return update_vol(ubi, ai, av, new_vh, new_aeb);
369}
370
371/**
372 * unmap_peb - unmap a PEB.
373 * If fastmap detects a free PEB in the pool it has to check whether
374 * this PEB has been unmapped after writing the fastmap.
375 *
376 * @ai: UBI attach info object
377 * @pnum: The PEB to be unmapped
378 */
379static void unmap_peb(struct ubi_attach_info *ai, int pnum)
380{
381 struct ubi_ainf_volume *av;
382 struct rb_node *node, *node2;
383 struct ubi_ainf_peb *aeb;
384
f2fb1346
BB		 385 ubi_rb_for_each_entry(node, av, &ai->volumes, rb) {
386 ubi_rb_for_each_entry(node2, aeb, &av->root, u.rb) {
dbb7d2a8
RW		 387 if (aeb->pnum == pnum) {
388 rb_erase(&aeb->u.rb, &av->root);
ad3d6a05 389 av->leb_count--;
91f4285f 390 ubi_free_aeb(ai, aeb);
dbb7d2a8
RW		 391 return;
392 }
393 }
394 }
395}
396
397/**
398 * scan_pool - scans a pool for changed (no longer empty PEBs).
399 * @ubi: UBI device object
400 * @ai: attach info object
401 * @pebs: an array of all PEB numbers in the to be scanned pool
402 * @pool_size: size of the pool (number of entries in @pebs)
403 * @max_sqnum: pointer to the maximal sequence number
dbb7d2a8
RW		 404 * @free: list of PEBs which are most likely free (and go into @ai->free)
405 *
406 * Returns 0 on success, if the pool is unusable UBI_BAD_FASTMAP is returned.
407 * < 0 indicates an internal error.
408 */
409static int scan_pool(struct ubi_device *ubi, struct ubi_attach_info *ai,
2a130f1a 410 __be32 *pebs, int pool_size, unsigned long long *max_sqnum,
d141a8ef 411 struct list_head *free)
dbb7d2a8 412{
3291b52f 413 struct ubi_vid_io_buf *vb;
dbb7d2a8
RW		 414 struct ubi_vid_hdr *vh;
415 struct ubi_ec_hdr *ech;
d141a8ef
RW		 416 struct ubi_ainf_peb *new_aeb;
417 int i, pnum, err, ret = 0;
dbb7d2a8
RW		 418
419 ech = kzalloc(ubi->ec_hdr_alsize, GFP_KERNEL);
420 if (!ech)
421 return -ENOMEM;
422
3291b52f
BB		 423 vb = ubi_alloc_vid_buf(ubi, GFP_KERNEL);
424 if (!vb) {
dbb7d2a8
RW		 425 kfree(ech);
426 return -ENOMEM;
427 }
428
3291b52f
BB		 429 vh = ubi_get_vid_hdr(vb);
430
dbb7d2a8
RW		 431 dbg_bld("scanning fastmap pool: size = %i", pool_size);
432
433 /*
434 * Now scan all PEBs in the pool to find changes which have been made
435 * after the creation of the fastmap
436 */
437 for (i = 0; i < pool_size; i++) {
438 int scrub = 0;
c22301ad 439 int image_seq;
dbb7d2a8
RW		 440
441 pnum = be32_to_cpu(pebs[i]);
442
443 if (ubi_io_is_bad(ubi, pnum)) {
32608703 444 ubi_err(ubi, "bad PEB in fastmap pool!");
dbb7d2a8
RW		 445 ret = UBI_BAD_FASTMAP;
446 goto out;
447 }
448
449 err = ubi_io_read_ec_hdr(ubi, pnum, ech, 0);
450 if (err && err != UBI_IO_BITFLIPS) {
32608703 451 ubi_err(ubi, "unable to read EC header! PEB:%i err:%i",
dbb7d2a8
RW		 452 pnum, err);
453 ret = err > 0 ? UBI_BAD_FASTMAP : err;
454 goto out;
44305ebd 455 } else if (err == UBI_IO_BITFLIPS)
dbb7d2a8
RW		 456 scrub = 1;
457
c22301ad
RG		 458 /*
459 * Older UBI implementations have image_seq set to zero, so
460 * we shouldn't fail if image_seq == 0.
461 */
462 image_seq = be32_to_cpu(ech->image_seq);
463
464 if (image_seq && (image_seq != ubi->image_seq)) {
32608703 465 ubi_err(ubi, "bad image seq: 0x%x, expected: 0x%x",
dbb7d2a8 466 be32_to_cpu(ech->image_seq), ubi->image_seq);
f240dca8 467 ret = UBI_BAD_FASTMAP;
dbb7d2a8
RW		 468 goto out;
469 }
470
3291b52f 471 err = ubi_io_read_vid_hdr(ubi, pnum, vb, 0);
dbb7d2a8
RW		 472 if (err == UBI_IO_FF || err == UBI_IO_FF_BITFLIPS) {
473 unsigned long long ec = be64_to_cpu(ech->ec);
474 unmap_peb(ai, pnum);
475 dbg_bld("Adding PEB to free: %i", pnum);
ecbfa8ea 476
dbb7d2a8 477 if (err == UBI_IO_FF_BITFLIPS)
ecbfa8ea
BB		 478 scrub = 1;
479
480 add_aeb(ai, free, pnum, ec, scrub);
dbb7d2a8
RW		 481 continue;
482 } else if (err == 0 || err == UBI_IO_BITFLIPS) {
483 dbg_bld("Found non empty PEB:%i in pool", pnum);
484
485 if (err == UBI_IO_BITFLIPS)
486 scrub = 1;
487
91f4285f 488 new_aeb = ubi_alloc_aeb(ai, pnum, be64_to_cpu(ech->ec));
dbb7d2a8
RW		 489 if (!new_aeb) {
490 ret = -ENOMEM;
491 goto out;
492 }
493
dbb7d2a8
RW		 494 new_aeb->lnum = be32_to_cpu(vh->lnum);
495 new_aeb->sqnum = be64_to_cpu(vh->sqnum);
496 new_aeb->copy_flag = vh->copy_flag;
497 new_aeb->scrub = scrub;
498
499 if (*max_sqnum < new_aeb->sqnum)
500 *max_sqnum = new_aeb->sqnum;
501
502 err = process_pool_aeb(ubi, ai, vh, new_aeb);
503 if (err) {
504 ret = err > 0 ? UBI_BAD_FASTMAP : err;
505 goto out;
506 }
507 } else {
508 /* We are paranoid and fall back to scanning mode */
32608703 509 ubi_err(ubi, "fastmap pool PEBs contains damaged PEBs!");
dbb7d2a8
RW		 510 ret = err > 0 ? UBI_BAD_FASTMAP : err;
511 goto out;
512 }
513
514 }
515
516out:
3291b52f 517 ubi_free_vid_buf(vb);
dbb7d2a8
RW		 518 kfree(ech);
519 return ret;
520}
521
522/**
523 * count_fastmap_pebs - Counts the PEBs found by fastmap.
524 * @ai: The UBI attach info object
525 */
526static int count_fastmap_pebs(struct ubi_attach_info *ai)
527{
528 struct ubi_ainf_peb *aeb;
529 struct ubi_ainf_volume *av;
530 struct rb_node *rb1, *rb2;
531 int n = 0;
532
533 list_for_each_entry(aeb, &ai->erase, u.list)
534 n++;
535
536 list_for_each_entry(aeb, &ai->free, u.list)
537 n++;
538
be801105 539 ubi_rb_for_each_entry(rb1, av, &ai->volumes, rb)
dbb7d2a8
RW		 540 ubi_rb_for_each_entry(rb2, aeb, &av->root, u.rb)
541 n++;
542
543 return n;
544}
545
546/**
547 * ubi_attach_fastmap - creates ubi_attach_info from a fastmap.
548 * @ubi: UBI device object
549 * @ai: UBI attach info object
550 * @fm: the fastmap to be attached
551 *
552 * Returns 0 on success, UBI_BAD_FASTMAP if the found fastmap was unusable.
553 * < 0 indicates an internal error.
554 */
555static int ubi_attach_fastmap(struct ubi_device *ubi,
556 struct ubi_attach_info *ai,
557 struct ubi_fastmap_layout *fm)
558{
d141a8ef 559 struct list_head used, free;
dbb7d2a8
RW		 560 struct ubi_ainf_volume *av;
561 struct ubi_ainf_peb *aeb, *tmp_aeb, *_tmp_aeb;
dbb7d2a8
RW		 562 struct ubi_fm_sb *fmsb;
563 struct ubi_fm_hdr *fmhdr;
f6e951af 564 struct ubi_fm_scan_pool *fmpl, *fmpl_wl;
dbb7d2a8
RW		 565 struct ubi_fm_ec *fmec;
566 struct ubi_fm_volhdr *fmvhdr;
567 struct ubi_fm_eba *fm_eba;
568 int ret, i, j, pool_size, wl_pool_size;
569 size_t fm_pos = 0, fm_size = ubi->fm_size;
570 unsigned long long max_sqnum = 0;
571 void *fm_raw = ubi->fm_buf;
572
573 INIT_LIST_HEAD(&used);
574 INIT_LIST_HEAD(&free);
dbb7d2a8
RW		 575 ai->min_ec = UBI_MAX_ERASECOUNTER;
576
dbb7d2a8
RW		 577 fmsb = (struct ubi_fm_sb *)(fm_raw);
578 ai->max_sqnum = fmsb->sqnum;
579 fm_pos += sizeof(struct ubi_fm_sb);
580 if (fm_pos >= fm_size)
581 goto fail_bad;
582
583 fmhdr = (struct ubi_fm_hdr *)(fm_raw + fm_pos);
584 fm_pos += sizeof(*fmhdr);
585 if (fm_pos >= fm_size)
586 goto fail_bad;
587
588 if (be32_to_cpu(fmhdr->magic) != UBI_FM_HDR_MAGIC) {
32608703 589 ubi_err(ubi, "bad fastmap header magic: 0x%x, expected: 0x%x",
dbb7d2a8
RW		 590 be32_to_cpu(fmhdr->magic), UBI_FM_HDR_MAGIC);
591 goto fail_bad;
592 }
593
f6e951af 594 fmpl = (struct ubi_fm_scan_pool *)(fm_raw + fm_pos);
595 fm_pos += sizeof(*fmpl);
dbb7d2a8
RW		 596 if (fm_pos >= fm_size)
597 goto fail_bad;
f6e951af 598 if (be32_to_cpu(fmpl->magic) != UBI_FM_POOL_MAGIC) {
32608703 599 ubi_err(ubi, "bad fastmap pool magic: 0x%x, expected: 0x%x",
f6e951af 600 be32_to_cpu(fmpl->magic), UBI_FM_POOL_MAGIC);
dbb7d2a8
RW		 601 goto fail_bad;
602 }
603
f6e951af 604 fmpl_wl = (struct ubi_fm_scan_pool *)(fm_raw + fm_pos);
605 fm_pos += sizeof(*fmpl_wl);
dbb7d2a8
RW		 606 if (fm_pos >= fm_size)
607 goto fail_bad;
f6e951af 608 if (be32_to_cpu(fmpl_wl->magic) != UBI_FM_POOL_MAGIC) {
609 ubi_err(ubi, "bad fastmap WL pool magic: 0x%x, expected: 0x%x",
610 be32_to_cpu(fmpl_wl->magic), UBI_FM_POOL_MAGIC);
dbb7d2a8
RW		 611 goto fail_bad;
612 }
613
f6e951af 614 pool_size = be16_to_cpu(fmpl->size);
615 wl_pool_size = be16_to_cpu(fmpl_wl->size);
616 fm->max_pool_size = be16_to_cpu(fmpl->max_size);
617 fm->max_wl_pool_size = be16_to_cpu(fmpl_wl->max_size);
dbb7d2a8
RW		 618
619 if (pool_size > UBI_FM_MAX_POOL_SIZE || pool_size < 0) {
32608703 620 ubi_err(ubi, "bad pool size: %i", pool_size);
dbb7d2a8
RW		 621 goto fail_bad;
622 }
623
624 if (wl_pool_size > UBI_FM_MAX_POOL_SIZE || wl_pool_size < 0) {
32608703 625 ubi_err(ubi, "bad WL pool size: %i", wl_pool_size);
dbb7d2a8
RW		 626 goto fail_bad;
627 }
628
629
630 if (fm->max_pool_size > UBI_FM_MAX_POOL_SIZE ||
631 fm->max_pool_size < 0) {
32608703 632 ubi_err(ubi, "bad maximal pool size: %i", fm->max_pool_size);
dbb7d2a8
RW		 633 goto fail_bad;
634 }
635
636 if (fm->max_wl_pool_size > UBI_FM_MAX_POOL_SIZE ||
637 fm->max_wl_pool_size < 0) {
32608703
TB		 638 ubi_err(ubi, "bad maximal WL pool size: %i",
639 fm->max_wl_pool_size);
dbb7d2a8
RW		 640 goto fail_bad;
641 }
642
643 /* read EC values from free list */
644 for (i = 0; i < be32_to_cpu(fmhdr->free_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, &ai->free, be32_to_cpu(fmec->pnum),
651 be32_to_cpu(fmec->ec), 0);
652 }
653
654 /* read EC values from used list */
655 for (i = 0; i < be32_to_cpu(fmhdr->used_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), 0);
663 }
664
665 /* read EC values from scrub list */
666 for (i = 0; i < be32_to_cpu(fmhdr->scrub_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, &used, be32_to_cpu(fmec->pnum),
673 be32_to_cpu(fmec->ec), 1);
674 }
675
676 /* read EC values from erase list */
677 for (i = 0; i < be32_to_cpu(fmhdr->erase_peb_count); i++) {
678 fmec = (struct ubi_fm_ec *)(fm_raw + fm_pos);
679 fm_pos += sizeof(*fmec);
680 if (fm_pos >= fm_size)
681 goto fail_bad;
682
683 add_aeb(ai, &ai->erase, be32_to_cpu(fmec->pnum),
684 be32_to_cpu(fmec->ec), 1);
685 }
686
687 ai->mean_ec = div_u64(ai->ec_sum, ai->ec_count);
688 ai->bad_peb_count = be32_to_cpu(fmhdr->bad_peb_count);
689
690 /* Iterate over all volumes and read their EBA table */
691 for (i = 0; i < be32_to_cpu(fmhdr->vol_count); i++) {
692 fmvhdr = (struct ubi_fm_volhdr *)(fm_raw + fm_pos);
693 fm_pos += sizeof(*fmvhdr);
694 if (fm_pos >= fm_size)
695 goto fail_bad;
696
697 if (be32_to_cpu(fmvhdr->magic) != UBI_FM_VHDR_MAGIC) {
32608703 698 ubi_err(ubi, "bad fastmap vol header magic: 0x%x, expected: 0x%x",
dbb7d2a8
RW		 699 be32_to_cpu(fmvhdr->magic), UBI_FM_VHDR_MAGIC);
700 goto fail_bad;
701 }
702
703 av = add_vol(ai, be32_to_cpu(fmvhdr->vol_id),
704 be32_to_cpu(fmvhdr->used_ebs),
705 be32_to_cpu(fmvhdr->data_pad),
706 fmvhdr->vol_type,
707 be32_to_cpu(fmvhdr->last_eb_bytes));
708
709 if (!av)
710 goto fail_bad;
e96a8a3b 711 if (PTR_ERR(av) == -EINVAL) {
712 ubi_err(ubi, "volume (ID %i) already exists",
713 fmvhdr->vol_id);
714 goto fail_bad;
715 }
dbb7d2a8
RW		 716
717 ai->vols_found++;
718 if (ai->highest_vol_id < be32_to_cpu(fmvhdr->vol_id))
719 ai->highest_vol_id = be32_to_cpu(fmvhdr->vol_id);
720
721 fm_eba = (struct ubi_fm_eba *)(fm_raw + fm_pos);
722 fm_pos += sizeof(*fm_eba);
723 fm_pos += (sizeof(__be32) * be32_to_cpu(fm_eba->reserved_pebs));
724 if (fm_pos >= fm_size)
725 goto fail_bad;
726
727 if (be32_to_cpu(fm_eba->magic) != UBI_FM_EBA_MAGIC) {
32608703 728 ubi_err(ubi, "bad fastmap EBA header magic: 0x%x, expected: 0x%x",
dbb7d2a8
RW		 729 be32_to_cpu(fm_eba->magic), UBI_FM_EBA_MAGIC);
730 goto fail_bad;
731 }
732
733 for (j = 0; j < be32_to_cpu(fm_eba->reserved_pebs); j++) {
734 int pnum = be32_to_cpu(fm_eba->pnum[j]);
735
876f9a34 736 if (pnum < 0)
dbb7d2a8
RW		 737 continue;
738
739 aeb = NULL;
740 list_for_each_entry(tmp_aeb, &used, u.list) {
584d4623 741 if (tmp_aeb->pnum == pnum) {
dbb7d2a8 742 aeb = tmp_aeb;
584d4623
BP		 743 break;
744 }
dbb7d2a8
RW		 745 }
746
dbb7d2a8 747 if (!aeb) {
d141a8ef
RW		 748 ubi_err(ubi, "PEB %i is in EBA but not in used list", pnum);
749 goto fail_bad;
dbb7d2a8
RW		 750 }
751
752 aeb->lnum = j;
753
754 if (av->highest_lnum <= aeb->lnum)
755 av->highest_lnum = aeb->lnum;
756
757 assign_aeb_to_av(ai, aeb, av);
758
759 dbg_bld("inserting PEB:%i (LEB %i) to vol %i",
760 aeb->pnum, aeb->lnum, av->vol_id);
761 }
dbb7d2a8
RW		 762 }
763
f6e951af 764 ret = scan_pool(ubi, ai, fmpl->pebs, pool_size, &max_sqnum, &free);
dbb7d2a8
RW		 765 if (ret)
766 goto fail;
767
f6e951af 768 ret = scan_pool(ubi, ai, fmpl_wl->pebs, wl_pool_size, &max_sqnum, &free);
dbb7d2a8
RW		 769 if (ret)
770 goto fail;
771
772 if (max_sqnum > ai->max_sqnum)
773 ai->max_sqnum = max_sqnum;
774
6a059abd
WY		 775 list_for_each_entry_safe(tmp_aeb, _tmp_aeb, &free, u.list)
776 list_move_tail(&tmp_aeb->u.list, &ai->free);
dbb7d2a8 777
a83832a7
RW		 778 list_for_each_entry_safe(tmp_aeb, _tmp_aeb, &used, u.list)
779 list_move_tail(&tmp_aeb->u.list, &ai->erase);
780
ae0d1469
RW		 781 ubi_assert(list_empty(&free));
782
dbb7d2a8
RW		 783 /*
784 * If fastmap is leaking PEBs (must not happen), raise a
785 * fat warning and fall back to scanning mode.
786 * We do this here because in ubi_wl_init() it's too late
787 * and we cannot fall back to scanning.
788 */
789 if (WARN_ON(count_fastmap_pebs(ai) != ubi->peb_count -
790 ai->bad_peb_count - fm->used_blocks))
791 goto fail_bad;
792
793 return 0;
794
795fail_bad:
796 ret = UBI_BAD_FASTMAP;
797fail:
fe24c6e5 798 list_for_each_entry_safe(tmp_aeb, _tmp_aeb, &used, u.list) {
fe24c6e5 799 list_del(&tmp_aeb->u.list);
91f4285f 800 ubi_free_aeb(ai, tmp_aeb);
fe24c6e5 801 }
fe24c6e5 802 list_for_each_entry_safe(tmp_aeb, _tmp_aeb, &free, u.list) {
fe24c6e5 803 list_del(&tmp_aeb->u.list);
91f4285f 804 ubi_free_aeb(ai, tmp_aeb);
fe24c6e5
RW		 805 }
806
dbb7d2a8
RW		 807 return ret;
808}
809
fdf10ed7
RW		 810/**
811 * find_fm_anchor - find the most recent Fastmap superblock (anchor)
812 * @ai: UBI attach info to be filled
813 */
814static int find_fm_anchor(struct ubi_attach_info *ai)
815{
816 int ret = -1;
817 struct ubi_ainf_peb *aeb;
818 unsigned long long max_sqnum = 0;
819
820 list_for_each_entry(aeb, &ai->fastmap, u.list) {
821 if (aeb->vol_id == UBI_FM_SB_VOLUME_ID && aeb->sqnum > max_sqnum) {
822 max_sqnum = aeb->sqnum;
823 ret = aeb->pnum;
824 }
825 }
826
827 return ret;
828}
829
dbb7d2a8
RW		 830/**
831 * ubi_scan_fastmap - scan the fastmap.
832 * @ubi: UBI device object
833 * @ai: UBI attach info to be filled
fdf10ed7
RW		 834 * @scan_ai: UBI attach info from the first 64 PEBs,
835 * used to find the most recent Fastmap data structure
dbb7d2a8
RW		 836 *
837 * Returns 0 on success, UBI_NO_FASTMAP if no fastmap was found,
838 * UBI_BAD_FASTMAP if one was found but is not usable.
839 * < 0 indicates an internal error.
840 */
841int ubi_scan_fastmap(struct ubi_device *ubi, struct ubi_attach_info *ai,
fdf10ed7 842 struct ubi_attach_info *scan_ai)
dbb7d2a8
RW		 843{
844 struct ubi_fm_sb *fmsb, *fmsb2;
3291b52f 845 struct ubi_vid_io_buf *vb;
dbb7d2a8
RW		 846 struct ubi_vid_hdr *vh;
847 struct ubi_ec_hdr *ech;
848 struct ubi_fastmap_layout *fm;
fdf10ed7
RW		 849 struct ubi_ainf_peb *tmp_aeb, *aeb;
850 int i, used_blocks, pnum, fm_anchor, ret = 0;
dbb7d2a8
RW		 851 size_t fm_size;
852 __be32 crc, tmp_crc;
853 unsigned long long sqnum = 0;
854
fdf10ed7
RW		 855 fm_anchor = find_fm_anchor(scan_ai);
856 if (fm_anchor < 0)
857 return UBI_NO_FASTMAP;
858
859 /* Move all (possible) fastmap blocks into our new attach structure. */
860 list_for_each_entry_safe(aeb, tmp_aeb, &scan_ai->fastmap, u.list)
861 list_move_tail(&aeb->u.list, &ai->fastmap);
862
111ab0b2 863 down_write(&ubi->fm_protect);
dbb7d2a8
RW		 864 memset(ubi->fm_buf, 0, ubi->fm_size);
865
866 fmsb = kmalloc(sizeof(*fmsb), GFP_KERNEL);
867 if (!fmsb) {
868 ret = -ENOMEM;
869 goto out;
870 }
871
872 fm = kzalloc(sizeof(*fm), GFP_KERNEL);
873 if (!fm) {
874 ret = -ENOMEM;
875 kfree(fmsb);
876 goto out;
877 }
878
fcbb6af1 879 ret = ubi_io_read_data(ubi, fmsb, fm_anchor, 0, sizeof(*fmsb));
dbb7d2a8
RW		 880 if (ret && ret != UBI_IO_BITFLIPS)
881 goto free_fm_sb;
882 else if (ret == UBI_IO_BITFLIPS)
883 fm->to_be_tortured[0] = 1;
884
885 if (be32_to_cpu(fmsb->magic) != UBI_FM_SB_MAGIC) {
32608703 886 ubi_err(ubi, "bad super block magic: 0x%x, expected: 0x%x",
dbb7d2a8
RW		 887 be32_to_cpu(fmsb->magic), UBI_FM_SB_MAGIC);
888 ret = UBI_BAD_FASTMAP;
889 goto free_fm_sb;
890 }
891
892 if (fmsb->version != UBI_FM_FMT_VERSION) {
32608703 893 ubi_err(ubi, "bad fastmap version: %i, expected: %i",
dbb7d2a8
RW		 894 fmsb->version, UBI_FM_FMT_VERSION);
895 ret = UBI_BAD_FASTMAP;
896 goto free_fm_sb;
897 }
898
899 used_blocks = be32_to_cpu(fmsb->used_blocks);
900 if (used_blocks > UBI_FM_MAX_BLOCKS || used_blocks < 1) {
32608703
TB		 901 ubi_err(ubi, "number of fastmap blocks is invalid: %i",
902 used_blocks);
dbb7d2a8
RW		 903 ret = UBI_BAD_FASTMAP;
904 goto free_fm_sb;
905 }
906
907 fm_size = ubi->leb_size * used_blocks;
908 if (fm_size != ubi->fm_size) {
32608703
TB		 909 ubi_err(ubi, "bad fastmap size: %zi, expected: %zi",
910 fm_size, ubi->fm_size);
dbb7d2a8
RW		 911 ret = UBI_BAD_FASTMAP;
912 goto free_fm_sb;
913 }
914
915 ech = kzalloc(ubi->ec_hdr_alsize, GFP_KERNEL);
916 if (!ech) {
917 ret = -ENOMEM;
918 goto free_fm_sb;
919 }
920
3291b52f
BB		 921 vb = ubi_alloc_vid_buf(ubi, GFP_KERNEL);
922 if (!vb) {
dbb7d2a8
RW		 923 ret = -ENOMEM;
924 goto free_hdr;
925 }
926
3291b52f
BB		 927 vh = ubi_get_vid_hdr(vb);
928
dbb7d2a8 929 for (i = 0; i < used_blocks; i++) {
c22301ad
RG		 930 int image_seq;
931
dbb7d2a8
RW		 932 pnum = be32_to_cpu(fmsb->block_loc[i]);
933
934 if (ubi_io_is_bad(ubi, pnum)) {
935 ret = UBI_BAD_FASTMAP;
936 goto free_hdr;
937 }
938
5283ec72
RW		 939 if (i == 0 && pnum != fm_anchor) {
940 ubi_err(ubi, "Fastmap anchor PEB mismatch: PEB: %i vs. %i",
941 pnum, fm_anchor);
942 ret = UBI_BAD_FASTMAP;
943 goto free_hdr;
944 }
945
dbb7d2a8
RW		 946 ret = ubi_io_read_ec_hdr(ubi, pnum, ech, 0);
947 if (ret && ret != UBI_IO_BITFLIPS) {
32608703 948 ubi_err(ubi, "unable to read fastmap block# %i EC (PEB: %i)",
dbb7d2a8
RW		 949 i, pnum);
950 if (ret > 0)
951 ret = UBI_BAD_FASTMAP;
952 goto free_hdr;
953 } else if (ret == UBI_IO_BITFLIPS)
954 fm->to_be_tortured[i] = 1;
955
c22301ad 956 image_seq = be32_to_cpu(ech->image_seq);
dbb7d2a8 957 if (!ubi->image_seq)
c22301ad 958 ubi->image_seq = image_seq;
dbb7d2a8 959
c22301ad
RG		 960 /*
961 * Older UBI implementations have image_seq set to zero, so
962 * we shouldn't fail if image_seq == 0.
963 */
964 if (image_seq && (image_seq != ubi->image_seq)) {
32608703 965 ubi_err(ubi, "wrong image seq:%d instead of %d",
c22301ad 966 be32_to_cpu(ech->image_seq), ubi->image_seq);
dbb7d2a8
RW		 967 ret = UBI_BAD_FASTMAP;
968 goto free_hdr;
969 }
970
3291b52f 971 ret = ubi_io_read_vid_hdr(ubi, pnum, vb, 0);
dbb7d2a8 972 if (ret && ret != UBI_IO_BITFLIPS) {
32608703 973 ubi_err(ubi, "unable to read fastmap block# %i (PEB: %i)",
dbb7d2a8
RW		 974 i, pnum);
975 goto free_hdr;
976 }
977
978 if (i == 0) {
979 if (be32_to_cpu(vh->vol_id) != UBI_FM_SB_VOLUME_ID) {
32608703 980 ubi_err(ubi, "bad fastmap anchor vol_id: 0x%x, expected: 0x%x",
dbb7d2a8
RW		 981 be32_to_cpu(vh->vol_id),
982 UBI_FM_SB_VOLUME_ID);
983 ret = UBI_BAD_FASTMAP;
984 goto free_hdr;
985 }
986 } else {
987 if (be32_to_cpu(vh->vol_id) != UBI_FM_DATA_VOLUME_ID) {
32608703 988 ubi_err(ubi, "bad fastmap data vol_id: 0x%x, expected: 0x%x",
dbb7d2a8
RW		 989 be32_to_cpu(vh->vol_id),
990 UBI_FM_DATA_VOLUME_ID);
991 ret = UBI_BAD_FASTMAP;
992 goto free_hdr;
993 }
994 }
995
996 if (sqnum < be64_to_cpu(vh->sqnum))
997 sqnum = be64_to_cpu(vh->sqnum);
998
fcbb6af1
BB		 999 ret = ubi_io_read_data(ubi, ubi->fm_buf + (ubi->leb_size * i),
1000 pnum, 0, ubi->leb_size);
dbb7d2a8 1001 if (ret && ret != UBI_IO_BITFLIPS) {
32608703 1002 ubi_err(ubi, "unable to read fastmap block# %i (PEB: %i, "
dbb7d2a8
RW		 1003 "err: %i)", i, pnum, ret);
1004 goto free_hdr;
1005 }
1006 }
1007
1008 kfree(fmsb);
1009 fmsb = NULL;
1010
1011 fmsb2 = (struct ubi_fm_sb *)(ubi->fm_buf);
1012 tmp_crc = be32_to_cpu(fmsb2->data_crc);
1013 fmsb2->data_crc = 0;
1014 crc = crc32(UBI_CRC32_INIT, ubi->fm_buf, fm_size);
1015 if (crc != tmp_crc) {
32608703
TB		 1016 ubi_err(ubi, "fastmap data CRC is invalid");
1017 ubi_err(ubi, "CRC should be: 0x%x, calc: 0x%x",
1018 tmp_crc, crc);
dbb7d2a8
RW		 1019 ret = UBI_BAD_FASTMAP;
1020 goto free_hdr;
1021 }
1022
1023 fmsb2->sqnum = sqnum;
1024
1025 fm->used_blocks = used_blocks;
1026
1027 ret = ubi_attach_fastmap(ubi, ai, fm);
1028 if (ret) {
1029 if (ret > 0)
1030 ret = UBI_BAD_FASTMAP;
1031 goto free_hdr;
1032 }
1033
1034 for (i = 0; i < used_blocks; i++) {
1035 struct ubi_wl_entry *e;
1036
1037 e = kmem_cache_alloc(ubi_wl_entry_slab, GFP_KERNEL);
1038 if (!e) {
1039 while (i--)
1040 kfree(fm->e[i]);
1041
1042 ret = -ENOMEM;
1043 goto free_hdr;
1044 }
1045
1046 e->pnum = be32_to_cpu(fmsb2->block_loc[i]);
1047 e->ec = be32_to_cpu(fmsb2->block_ec[i]);
1048 fm->e[i] = e;
1049 }
1050
1051 ubi->fm = fm;
1052 ubi->fm_pool.max_size = ubi->fm->max_pool_size;
1053 ubi->fm_wl_pool.max_size = ubi->fm->max_wl_pool_size;
32608703
TB		 1054 ubi_msg(ubi, "attached by fastmap");
1055 ubi_msg(ubi, "fastmap pool size: %d", ubi->fm_pool.max_size);
1056 ubi_msg(ubi, "fastmap WL pool size: %d",
1057 ubi->fm_wl_pool.max_size);
dbb7d2a8 1058 ubi->fm_disabled = 0;
1900149c 1059 ubi->fast_attach = 1;
dbb7d2a8 1060
3291b52f 1061 ubi_free_vid_buf(vb);
dbb7d2a8
RW		 1062 kfree(ech);
1063out:
111ab0b2 1064 up_write(&ubi->fm_protect);
dbb7d2a8 1065 if (ret == UBI_BAD_FASTMAP)
32608703 1066 ubi_err(ubi, "Attach by fastmap failed, doing a full scan!");
dbb7d2a8
RW		 1067 return ret;
1068
1069free_hdr:
3291b52f 1070 ubi_free_vid_buf(vb);
dbb7d2a8
RW		 1071 kfree(ech);
1072free_fm_sb:
1073 kfree(fmsb);
1074 kfree(fm);
1075 goto out;
1076}
1077
1078/**
1079 * ubi_write_fastmap - writes a fastmap.
1080 * @ubi: UBI device object
1081 * @new_fm: the to be written fastmap
1082 *
1083 * Returns 0 on success, < 0 indicates an internal error.
1084 */
1085static int ubi_write_fastmap(struct ubi_device *ubi,
1086 struct ubi_fastmap_layout *new_fm)
1087{
1088 size_t fm_pos = 0;
1089 void *fm_raw;
1090 struct ubi_fm_sb *fmsb;
1091 struct ubi_fm_hdr *fmh;
f6e951af 1092 struct ubi_fm_scan_pool *fmpl, *fmpl_wl;
dbb7d2a8
RW		 1093 struct ubi_fm_ec *fec;
1094 struct ubi_fm_volhdr *fvh;
1095 struct ubi_fm_eba *feba;
dbb7d2a8
RW		 1096 struct ubi_wl_entry *wl_e;
1097 struct ubi_volume *vol;
3291b52f 1098 struct ubi_vid_io_buf *avbuf, *dvbuf;
dbb7d2a8
RW		 1099 struct ubi_vid_hdr *avhdr, *dvhdr;
1100 struct ubi_work *ubi_wrk;
c5c3f3cf 1101 struct rb_node *tmp_rb;
dbb7d2a8
RW		 1102 int ret, i, j, free_peb_count, used_peb_count, vol_count;
1103 int scrub_peb_count, erase_peb_count;
5d71afb0 1104 unsigned long *seen_pebs = NULL;
dbb7d2a8
RW		 1105
1106 fm_raw = ubi->fm_buf;
1107 memset(ubi->fm_buf, 0, ubi->fm_size);
1108
3291b52f
BB		 1109 avbuf = new_fm_vbuf(ubi, UBI_FM_SB_VOLUME_ID);
1110 if (!avbuf) {
dbb7d2a8
RW		 1111 ret = -ENOMEM;
1112 goto out;
1113 }
1114
3291b52f
BB		 1115 dvbuf = new_fm_vbuf(ubi, UBI_FM_DATA_VOLUME_ID);
1116 if (!dvbuf) {
dbb7d2a8
RW		 1117 ret = -ENOMEM;
1118 goto out_kfree;
1119 }
1120
3291b52f
BB		 1121 avhdr = ubi_get_vid_hdr(avbuf);
1122 dvhdr = ubi_get_vid_hdr(dvbuf);
1123
daef3dd1
RW		 1124 seen_pebs = init_seen(ubi);
1125 if (IS_ERR(seen_pebs)) {
1126 ret = PTR_ERR(seen_pebs);
1127 goto out_kfree;
1128 }
1129
dbb7d2a8
RW		 1130 spin_lock(&ubi->volumes_lock);
1131 spin_lock(&ubi->wl_lock);
1132
1133 fmsb = (struct ubi_fm_sb *)fm_raw;
1134 fm_pos += sizeof(*fmsb);
1135 ubi_assert(fm_pos <= ubi->fm_size);
1136
1137 fmh = (struct ubi_fm_hdr *)(fm_raw + fm_pos);
1138 fm_pos += sizeof(*fmh);
1139 ubi_assert(fm_pos <= ubi->fm_size);
1140
1141 fmsb->magic = cpu_to_be32(UBI_FM_SB_MAGIC);
1142 fmsb->version = UBI_FM_FMT_VERSION;
1143 fmsb->used_blocks = cpu_to_be32(new_fm->used_blocks);
1144 /* the max sqnum will be filled in while *reading* the fastmap */
1145 fmsb->sqnum = 0;
1146
1147 fmh->magic = cpu_to_be32(UBI_FM_HDR_MAGIC);
1148 free_peb_count = 0;
1149 used_peb_count = 0;
1150 scrub_peb_count = 0;
1151 erase_peb_count = 0;
1152 vol_count = 0;
1153
f6e951af 1154 fmpl = (struct ubi_fm_scan_pool *)(fm_raw + fm_pos);
1155 fm_pos += sizeof(*fmpl);
1156 fmpl->magic = cpu_to_be32(UBI_FM_POOL_MAGIC);
1157 fmpl->size = cpu_to_be16(ubi->fm_pool.size);
1158 fmpl->max_size = cpu_to_be16(ubi->fm_pool.max_size);
dbb7d2a8 1159
daef3dd1 1160 for (i = 0; i < ubi->fm_pool.size; i++) {
f6e951af 1161 fmpl->pebs[i] = cpu_to_be32(ubi->fm_pool.pebs[i]);
daef3dd1
RW		 1162 set_seen(ubi, ubi->fm_pool.pebs[i], seen_pebs);
1163 }
dbb7d2a8 1164
f6e951af 1165 fmpl_wl = (struct ubi_fm_scan_pool *)(fm_raw + fm_pos);
1166 fm_pos += sizeof(*fmpl_wl);
1167 fmpl_wl->magic = cpu_to_be32(UBI_FM_POOL_MAGIC);
1168 fmpl_wl->size = cpu_to_be16(ubi->fm_wl_pool.size);
1169 fmpl_wl->max_size = cpu_to_be16(ubi->fm_wl_pool.max_size);
dbb7d2a8 1170
daef3dd1 1171 for (i = 0; i < ubi->fm_wl_pool.size; i++) {
f6e951af 1172 fmpl_wl->pebs[i] = cpu_to_be32(ubi->fm_wl_pool.pebs[i]);
daef3dd1
RW		 1173 set_seen(ubi, ubi->fm_wl_pool.pebs[i], seen_pebs);
1174 }
dbb7d2a8 1175
c5c3f3cf 1176 ubi_for_each_free_peb(ubi, wl_e, tmp_rb) {
dbb7d2a8
RW		 1177 fec = (struct ubi_fm_ec *)(fm_raw + fm_pos);
1178
1179 fec->pnum = cpu_to_be32(wl_e->pnum);
daef3dd1 1180 set_seen(ubi, wl_e->pnum, seen_pebs);
dbb7d2a8
RW		 1181 fec->ec = cpu_to_be32(wl_e->ec);
1182
1183 free_peb_count++;
1184 fm_pos += sizeof(*fec);
1185 ubi_assert(fm_pos <= ubi->fm_size);
1186 }
1187 fmh->free_peb_count = cpu_to_be32(free_peb_count);
1188
c5c3f3cf 1189 ubi_for_each_used_peb(ubi, wl_e, tmp_rb) {
dbb7d2a8
RW		 1190 fec = (struct ubi_fm_ec *)(fm_raw + fm_pos);
1191
1192 fec->pnum = cpu_to_be32(wl_e->pnum);
daef3dd1 1193 set_seen(ubi, wl_e->pnum, seen_pebs);
dbb7d2a8
RW		 1194 fec->ec = cpu_to_be32(wl_e->ec);
1195
1196 used_peb_count++;
1197 fm_pos += sizeof(*fec);
1198 ubi_assert(fm_pos <= ubi->fm_size);
1199 }
4f5e3b6f 1200
c5c3f3cf
RW		 1201 ubi_for_each_protected_peb(ubi, i, wl_e) {
1202 fec = (struct ubi_fm_ec *)(fm_raw + fm_pos);
4f5e3b6f 1203
c5c3f3cf
RW		 1204 fec->pnum = cpu_to_be32(wl_e->pnum);
1205 set_seen(ubi, wl_e->pnum, seen_pebs);
1206 fec->ec = cpu_to_be32(wl_e->ec);
4f5e3b6f 1207
c5c3f3cf
RW		 1208 used_peb_count++;
1209 fm_pos += sizeof(*fec);
1210 ubi_assert(fm_pos <= ubi->fm_size);
4f5e3b6f 1211 }
dbb7d2a8
RW		 1212 fmh->used_peb_count = cpu_to_be32(used_peb_count);
1213
c5c3f3cf 1214 ubi_for_each_scrub_peb(ubi, wl_e, tmp_rb) {
dbb7d2a8
RW		 1215 fec = (struct ubi_fm_ec *)(fm_raw + fm_pos);
1216
1217 fec->pnum = cpu_to_be32(wl_e->pnum);
daef3dd1 1218 set_seen(ubi, wl_e->pnum, seen_pebs);
dbb7d2a8
RW		 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);
daef3dd1 1236 set_seen(ubi, wl_e->pnum, seen_pebs);
dbb7d2a8
RW		 1237 fec->ec = cpu_to_be32(wl_e->ec);
1238
1239 erase_peb_count++;
1240 fm_pos += sizeof(*fec);
1241 ubi_assert(fm_pos <= ubi->fm_size);
1242 }
1243 }
1244 fmh->erase_peb_count = cpu_to_be32(erase_peb_count);
1245
1246 for (i = 0; i < UBI_MAX_VOLUMES + UBI_INT_VOL_COUNT; i++) {
1247 vol = ubi->volumes[i];
1248
1249 if (!vol)
1250 continue;
1251
1252 vol_count++;
1253
1254 fvh = (struct ubi_fm_volhdr *)(fm_raw + fm_pos);
1255 fm_pos += sizeof(*fvh);
1256 ubi_assert(fm_pos <= ubi->fm_size);
1257
1258 fvh->magic = cpu_to_be32(UBI_FM_VHDR_MAGIC);
1259 fvh->vol_id = cpu_to_be32(vol->vol_id);
1260 fvh->vol_type = vol->vol_type;
1261 fvh->used_ebs = cpu_to_be32(vol->used_ebs);
1262 fvh->data_pad = cpu_to_be32(vol->data_pad);
1263 fvh->last_eb_bytes = cpu_to_be32(vol->last_eb_bytes);
1264
1265 ubi_assert(vol->vol_type == UBI_DYNAMIC_VOLUME ||
1266 vol->vol_type == UBI_STATIC_VOLUME);
1267
1268 feba = (struct ubi_fm_eba *)(fm_raw + fm_pos);
1269 fm_pos += sizeof(*feba) + (sizeof(__be32) * vol->reserved_pebs);
1270 ubi_assert(fm_pos <= ubi->fm_size);
1271
1f81a5cc
BB		 1272 for (j = 0; j < vol->reserved_pebs; j++) {
1273 struct ubi_eba_leb_desc ldesc;
1274
1275 ubi_eba_get_ldesc(vol, j, &ldesc);
1276 feba->pnum[j] = cpu_to_be32(ldesc.pnum);
1277 }
dbb7d2a8
RW		 1278
1279 feba->reserved_pebs = cpu_to_be32(j);
1280 feba->magic = cpu_to_be32(UBI_FM_EBA_MAGIC);
1281 }
1282 fmh->vol_count = cpu_to_be32(vol_count);
1283 fmh->bad_peb_count = cpu_to_be32(ubi->bad_peb_count);
1284
1285 avhdr->sqnum = cpu_to_be64(ubi_next_sqnum(ubi));
1286 avhdr->lnum = 0;
1287
1288 spin_unlock(&ubi->wl_lock);
1289 spin_unlock(&ubi->volumes_lock);
1290
1291 dbg_bld("writing fastmap SB to PEB %i", new_fm->e[0]->pnum);
3291b52f 1292 ret = ubi_io_write_vid_hdr(ubi, new_fm->e[0]->pnum, avbuf);
dbb7d2a8 1293 if (ret) {
32608703 1294 ubi_err(ubi, "unable to write vid_hdr to fastmap SB!");
dbb7d2a8
RW		 1295 goto out_kfree;
1296 }
1297
1298 for (i = 0; i < new_fm->used_blocks; i++) {
1299 fmsb->block_loc[i] = cpu_to_be32(new_fm->e[i]->pnum);
daef3dd1 1300 set_seen(ubi, new_fm->e[i]->pnum, seen_pebs);
dbb7d2a8
RW		 1301 fmsb->block_ec[i] = cpu_to_be32(new_fm->e[i]->ec);
1302 }
1303
1304 fmsb->data_crc = 0;
1305 fmsb->data_crc = cpu_to_be32(crc32(UBI_CRC32_INIT, fm_raw,
1306 ubi->fm_size));
1307
1308 for (i = 1; i < new_fm->used_blocks; i++) {
1309 dvhdr->sqnum = cpu_to_be64(ubi_next_sqnum(ubi));
1310 dvhdr->lnum = cpu_to_be32(i);
1311 dbg_bld("writing fastmap data to PEB %i sqnum %llu",
1312 new_fm->e[i]->pnum, be64_to_cpu(dvhdr->sqnum));
3291b52f 1313 ret = ubi_io_write_vid_hdr(ubi, new_fm->e[i]->pnum, dvbuf);
dbb7d2a8 1314 if (ret) {
32608703 1315 ubi_err(ubi, "unable to write vid_hdr to PEB %i!",
dbb7d2a8
RW		 1316 new_fm->e[i]->pnum);
1317 goto out_kfree;
1318 }
1319 }
1320
1321 for (i = 0; i < new_fm->used_blocks; i++) {
fcbb6af1
BB		 1322 ret = ubi_io_write_data(ubi, fm_raw + (i * ubi->leb_size),
1323 new_fm->e[i]->pnum, 0, ubi->leb_size);
dbb7d2a8 1324 if (ret) {
32608703 1325 ubi_err(ubi, "unable to write fastmap to PEB %i!",
dbb7d2a8
RW		 1326 new_fm->e[i]->pnum);
1327 goto out_kfree;
1328 }
1329 }
1330
1331 ubi_assert(new_fm);
1332 ubi->fm = new_fm;
1333
daef3dd1 1334 ret = self_check_seen(ubi, seen_pebs);
dbb7d2a8
RW		 1335 dbg_bld("fastmap written!");
1336
1337out_kfree:
3291b52f
BB		 1338 ubi_free_vid_buf(avbuf);
1339 ubi_free_vid_buf(dvbuf);
daef3dd1 1340 free_seen(seen_pebs);
dbb7d2a8
RW		 1341out:
1342 return ret;
1343}
1344
1345/**
1346 * erase_block - Manually erase a PEB.
1347 * @ubi: UBI device object
1348 * @pnum: PEB to be erased
1349 *
1350 * Returns the new EC value on success, < 0 indicates an internal error.
1351 */
1352static int erase_block(struct ubi_device *ubi, int pnum)
1353{
1354 int ret;
1355 struct ubi_ec_hdr *ec_hdr;
1356 long long ec;
1357
1358 ec_hdr = kzalloc(ubi->ec_hdr_alsize, GFP_KERNEL);
1359 if (!ec_hdr)
1360 return -ENOMEM;
1361
1362 ret = ubi_io_read_ec_hdr(ubi, pnum, ec_hdr, 0);
1363 if (ret < 0)
1364 goto out;
1365 else if (ret && ret != UBI_IO_BITFLIPS) {
1366 ret = -EINVAL;
1367 goto out;
1368 }
1369
1370 ret = ubi_io_sync_erase(ubi, pnum, 0);
1371 if (ret < 0)
1372 goto out;
1373
1374 ec = be64_to_cpu(ec_hdr->ec);
1375 ec += ret;
1376 if (ec > UBI_MAX_ERASECOUNTER) {
1377 ret = -EINVAL;
1378 goto out;
1379 }
1380
1381 ec_hdr->ec = cpu_to_be64(ec);
1382 ret = ubi_io_write_ec_hdr(ubi, pnum, ec_hdr);
1383 if (ret < 0)
1384 goto out;
1385
1386 ret = ec;
1387out:
1388 kfree(ec_hdr);
1389 return ret;
1390}
1391
1392/**
1393 * invalidate_fastmap - destroys a fastmap.
1394 * @ubi: UBI device object
dbb7d2a8 1395 *
5ca97ad8
RW		 1396 * This function ensures that upon next UBI attach a full scan
1397 * is issued. We need this if UBI is about to write a new fastmap
1398 * but is unable to do so. In this case we have two options:
1399 * a) Make sure that the current fastmap will not be usued upon
1400 * attach time and contine or b) fall back to RO mode to have the
1401 * current fastmap in a valid state.
dbb7d2a8
RW		 1402 * Returns 0 on success, < 0 indicates an internal error.
1403 */
5ca97ad8 1404static int invalidate_fastmap(struct ubi_device *ubi)
dbb7d2a8 1405{
8930fa50 1406 int ret;
5ca97ad8
RW		 1407 struct ubi_fastmap_layout *fm;
1408 struct ubi_wl_entry *e;
3291b52f
BB		 1409 struct ubi_vid_io_buf *vb = NULL;
1410 struct ubi_vid_hdr *vh;
dbb7d2a8 1411
5ca97ad8
RW		 1412 if (!ubi->fm)
1413 return 0;
1414
1415 ubi->fm = NULL;
1416
1417 ret = -ENOMEM;
1418 fm = kzalloc(sizeof(*fm), GFP_KERNEL);
1419 if (!fm)
1420 goto out;
dbb7d2a8 1421
3291b52f
BB		 1422 vb = new_fm_vbuf(ubi, UBI_FM_SB_VOLUME_ID);
1423 if (!vb)
5ca97ad8
RW		 1424 goto out_free_fm;
1425
3291b52f
BB		 1426 vh = ubi_get_vid_hdr(vb);
1427
5ca97ad8
RW		 1428 ret = -ENOSPC;
1429 e = ubi_wl_get_fm_peb(ubi, 1);
1430 if (!e)
1431 goto out_free_fm;
dbb7d2a8 1432
5ca97ad8
RW		 1433 /*
1434 * Create fake fastmap such that UBI will fall back
1435 * to scanning mode.
1436 */
dbb7d2a8 1437 vh->sqnum = cpu_to_be64(ubi_next_sqnum(ubi));
3291b52f 1438 ret = ubi_io_write_vid_hdr(ubi, e->pnum, vb);
5ca97ad8
RW		 1439 if (ret < 0) {
1440 ubi_wl_put_fm_peb(ubi, e, 0, 0);
1441 goto out_free_fm;
1442 }
dbb7d2a8 1443
5ca97ad8
RW		 1444 fm->used_blocks = 1;
1445 fm->e[0] = e;
1446
1447 ubi->fm = fm;
1448
1449out:
3291b52f 1450 ubi_free_vid_buf(vb);
dbb7d2a8 1451 return ret;
5ca97ad8
RW		 1452
1453out_free_fm:
1454 kfree(fm);
1455 goto out;
1456}
1457
1458/**
1459 * return_fm_pebs - returns all PEBs used by a fastmap back to the
1460 * WL sub-system.
1461 * @ubi: UBI device object
1462 * @fm: fastmap layout object
1463 */
1464static void return_fm_pebs(struct ubi_device *ubi,
1465 struct ubi_fastmap_layout *fm)
1466{
1467 int i;
1468
1469 if (!fm)
1470 return;
1471
1472 for (i = 0; i < fm->used_blocks; i++) {
1473 if (fm->e[i]) {
1474 ubi_wl_put_fm_peb(ubi, fm->e[i], i,
1475 fm->to_be_tortured[i]);
1476 fm->e[i] = NULL;
1477 }
1478 }
dbb7d2a8
RW		 1479}
1480
1481/**
1482 * ubi_update_fastmap - will be called by UBI if a volume changes or
1483 * a fastmap pool becomes full.
1484 * @ubi: UBI device object
1485 *
1486 * Returns 0 on success, < 0 indicates an internal error.
1487 */
1488int ubi_update_fastmap(struct ubi_device *ubi)
1489{
5ca97ad8 1490 int ret, i, j;
dbb7d2a8
RW		 1491 struct ubi_fastmap_layout *new_fm, *old_fm;
1492 struct ubi_wl_entry *tmp_e;
1493
111ab0b2 1494 down_write(&ubi->fm_protect);
2e8f08de
RW		 1495 down_write(&ubi->work_sem);
1496 down_write(&ubi->fm_eba_sem);
dbb7d2a8
RW		 1497
1498 ubi_refill_pools(ubi);
1499
1500 if (ubi->ro_mode || ubi->fm_disabled) {
2e8f08de
RW		 1501 up_write(&ubi->fm_eba_sem);
1502 up_write(&ubi->work_sem);
111ab0b2 1503 up_write(&ubi->fm_protect);
dbb7d2a8
RW		 1504 return 0;
1505 }
1506
1507 ret = ubi_ensure_anchor_pebs(ubi);
1508 if (ret) {
2e8f08de
RW		 1509 up_write(&ubi->fm_eba_sem);
1510 up_write(&ubi->work_sem);
111ab0b2 1511 up_write(&ubi->fm_protect);
dbb7d2a8
RW		 1512 return ret;
1513 }
1514
1515 new_fm = kzalloc(sizeof(*new_fm), GFP_KERNEL);
1516 if (!new_fm) {
2e8f08de
RW		 1517 up_write(&ubi->fm_eba_sem);
1518 up_write(&ubi->work_sem);
111ab0b2 1519 up_write(&ubi->fm_protect);
dbb7d2a8
RW		 1520 return -ENOMEM;
1521 }
1522
1523 new_fm->used_blocks = ubi->fm_size / ubi->leb_size;
dbb7d2a8
RW		 1524 old_fm = ubi->fm;
1525 ubi->fm = NULL;
1526
1527 if (new_fm->used_blocks > UBI_FM_MAX_BLOCKS) {
32608703 1528 ubi_err(ubi, "fastmap too large");
dbb7d2a8
RW		 1529 ret = -ENOSPC;
1530 goto err;
1531 }
1532
1533 for (i = 1; i < new_fm->used_blocks; i++) {
1534 spin_lock(&ubi->wl_lock);
1535 tmp_e = ubi_wl_get_fm_peb(ubi, 0);
1536 spin_unlock(&ubi->wl_lock);
1537
5ca97ad8
RW		 1538 if (!tmp_e) {
1539 if (old_fm && old_fm->e[i]) {
1540 ret = erase_block(ubi, old_fm->e[i]->pnum);
1541 if (ret < 0) {
1542 ubi_err(ubi, "could not erase old fastmap PEB");
1543
1544 for (j = 1; j < i; j++) {
1545 ubi_wl_put_fm_peb(ubi, new_fm->e[j],
1546 j, 0);
1547 new_fm->e[j] = NULL;
1548 }
1549 goto err;
1550 }
1551 new_fm->e[i] = old_fm->e[i];
1552 old_fm->e[i] = NULL;
1553 } else {
1554 ubi_err(ubi, "could not get any free erase block");
1555
1556 for (j = 1; j < i; j++) {
1557 ubi_wl_put_fm_peb(ubi, new_fm->e[j], j, 0);
1558 new_fm->e[j] = NULL;
1559 }
dbb7d2a8 1560
5ca97ad8 1561 ret = -ENOSPC;
dbb7d2a8
RW		 1562 goto err;
1563 }
dbb7d2a8 1564 } else {
c4ca6be9 1565 new_fm->e[i] = tmp_e;
dbb7d2a8 1566
5ca97ad8 1567 if (old_fm && old_fm->e[i]) {
dbb7d2a8
RW		 1568 ubi_wl_put_fm_peb(ubi, old_fm->e[i], i,
1569 old_fm->to_be_tortured[i]);
5ca97ad8
RW		 1570 old_fm->e[i] = NULL;
1571 }
dbb7d2a8
RW		 1572 }
1573 }
1574
61de74ce
RW		 1575 /* Old fastmap is larger than the new one */
1576 if (old_fm && new_fm->used_blocks < old_fm->used_blocks) {
1577 for (i = new_fm->used_blocks; i < old_fm->used_blocks; i++) {
1578 ubi_wl_put_fm_peb(ubi, old_fm->e[i], i,
1579 old_fm->to_be_tortured[i]);
5ca97ad8 1580 old_fm->e[i] = NULL;
61de74ce
RW		 1581 }
1582 }
1583
dbb7d2a8
RW		 1584 spin_lock(&ubi->wl_lock);
1585 tmp_e = ubi_wl_get_fm_peb(ubi, 1);
1586 spin_unlock(&ubi->wl_lock);
1587
1588 if (old_fm) {
1589 /* no fresh anchor PEB was found, reuse the old one */
1590 if (!tmp_e) {
1591 ret = erase_block(ubi, old_fm->e[0]->pnum);
1592 if (ret < 0) {
32608703 1593 ubi_err(ubi, "could not erase old anchor PEB");
dbb7d2a8 1594
5ca97ad8 1595 for (i = 1; i < new_fm->used_blocks; i++) {
dbb7d2a8
RW		 1596 ubi_wl_put_fm_peb(ubi, new_fm->e[i],
1597 i, 0);
5ca97ad8
RW		 1598 new_fm->e[i] = NULL;
1599 }
dbb7d2a8
RW		 1600 goto err;
1601 }
c4ca6be9 1602 new_fm->e[0] = old_fm->e[0];
dbb7d2a8 1603 new_fm->e[0]->ec = ret;
5ca97ad8 1604 old_fm->e[0] = NULL;
dbb7d2a8
RW		 1605 } else {
1606 /* we've got a new anchor PEB, return the old one */
1607 ubi_wl_put_fm_peb(ubi, old_fm->e[0], 0,
1608 old_fm->to_be_tortured[0]);
c4ca6be9 1609 new_fm->e[0] = tmp_e;
5ca97ad8 1610 old_fm->e[0] = NULL;
dbb7d2a8
RW		 1611 }
1612 } else {
1613 if (!tmp_e) {
32608703 1614 ubi_err(ubi, "could not find any anchor PEB");
dbb7d2a8 1615
5ca97ad8 1616 for (i = 1; i < new_fm->used_blocks; i++) {
dbb7d2a8 1617 ubi_wl_put_fm_peb(ubi, new_fm->e[i], i, 0);
5ca97ad8
RW		 1618 new_fm->e[i] = NULL;
1619 }
dbb7d2a8
RW		 1620
1621 ret = -ENOSPC;
1622 goto err;
1623 }
c4ca6be9 1624 new_fm->e[0] = tmp_e;
dbb7d2a8
RW		 1625 }
1626
dbb7d2a8 1627 ret = ubi_write_fastmap(ubi, new_fm);
dbb7d2a8
RW		 1628
1629 if (ret)
1630 goto err;
1631
1632out_unlock:
2e8f08de
RW		 1633 up_write(&ubi->fm_eba_sem);
1634 up_write(&ubi->work_sem);
111ab0b2 1635 up_write(&ubi->fm_protect);
dbb7d2a8
RW		 1636 kfree(old_fm);
1637 return ret;
1638
1639err:
32608703 1640 ubi_warn(ubi, "Unable to write new fastmap, err=%i", ret);
dbb7d2a8 1641
5ca97ad8
RW		 1642 ret = invalidate_fastmap(ubi);
1643 if (ret < 0) {
1644 ubi_err(ubi, "Unable to invalidiate current fastmap!");
1645 ubi_ro_mode(ubi);
1646 } else {
1647 return_fm_pebs(ubi, old_fm);
1648 return_fm_pebs(ubi, new_fm);
1649 ret = 0;
dbb7d2a8 1650 }
5ca97ad8
RW		 1651
1652 kfree(new_fm);
dbb7d2a8
RW		 1653 goto out_unlock;
1654}
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