2 * Copyright (c) 2012 Linutronix GmbH
3 * Copyright (c) 2014 sigma star gmbh
4 * Author: Richard Weinberger <richard@nod.at>
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.
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.
17 #include <linux/crc32.h>
21 * init_seen - allocate memory for used for debugging.
22 * @ubi: UBI device description object
24 static inline int *init_seen(struct ubi_device *ubi)
28 if (!ubi_dbg_chk_fastmap(ubi))
31 ret = kcalloc(ubi->peb_count, sizeof(int), GFP_KERNEL);
33 return ERR_PTR(-ENOMEM);
39 * free_seen - free the seen logic integer array.
40 * @seen: integer array of @ubi->peb_count size
42 static inline void free_seen(int *seen)
48 * set_seen - mark a PEB as seen.
49 * @ubi: UBI device description object
50 * @pnum: The PEB to be makred as seen
51 * @seen: integer array of @ubi->peb_count size
53 static inline void set_seen(struct ubi_device *ubi, int pnum, int *seen)
55 if (!ubi_dbg_chk_fastmap(ubi) || !seen)
62 * self_check_seen - check whether all PEB have been seen by fastmap.
63 * @ubi: UBI device description object
64 * @seen: integer array of @ubi->peb_count size
66 static int self_check_seen(struct ubi_device *ubi, int *seen)
70 if (!ubi_dbg_chk_fastmap(ubi) || !seen)
73 for (pnum = 0; pnum < ubi->peb_count; pnum++) {
74 if (!seen[pnum] && ubi->lookuptbl[pnum]) {
75 ubi_err(ubi, "self-check failed for PEB %d, fastmap didn't see it", pnum);
84 * ubi_calc_fm_size - calculates the fastmap size in bytes for an UBI device.
85 * @ubi: UBI device description object
87 size_t ubi_calc_fm_size(struct ubi_device *ubi)
91 size = sizeof(struct ubi_fm_sb) +
92 sizeof(struct ubi_fm_hdr) +
93 sizeof(struct ubi_fm_scan_pool) +
94 sizeof(struct ubi_fm_scan_pool) +
95 (ubi->peb_count * sizeof(struct ubi_fm_ec)) +
96 (sizeof(struct ubi_fm_eba) +
97 (ubi->peb_count * sizeof(__be32))) +
98 sizeof(struct ubi_fm_volhdr) * UBI_MAX_VOLUMES;
99 return roundup(size, ubi->leb_size);
104 * new_fm_vhdr - allocate a new volume header for fastmap usage.
105 * @ubi: UBI device description object
106 * @vol_id: the VID of the new header
108 * Returns a new struct ubi_vid_hdr on success.
109 * NULL indicates out of memory.
111 static struct ubi_vid_hdr *new_fm_vhdr(struct ubi_device *ubi, int vol_id)
113 struct ubi_vid_hdr *new;
115 new = ubi_zalloc_vid_hdr(ubi, GFP_KERNEL);
119 new->vol_type = UBI_VID_DYNAMIC;
120 new->vol_id = cpu_to_be32(vol_id);
122 /* UBI implementations without fastmap support have to delete the
125 new->compat = UBI_COMPAT_DELETE;
132 * add_aeb - create and add a attach erase block to a given list.
133 * @ai: UBI attach info object
134 * @list: the target list
135 * @pnum: PEB number of the new attach erase block
136 * @ec: erease counter of the new LEB
137 * @scrub: scrub this PEB after attaching
139 * Returns 0 on success, < 0 indicates an internal error.
141 static int add_aeb(struct ubi_attach_info *ai, struct list_head *list,
142 int pnum, int ec, int scrub)
144 struct ubi_ainf_peb *aeb;
146 aeb = kmem_cache_alloc(ai->aeb_slab_cache, GFP_KERNEL);
154 aeb->copy_flag = aeb->sqnum = 0;
156 ai->ec_sum += aeb->ec;
159 if (ai->max_ec < aeb->ec)
160 ai->max_ec = aeb->ec;
162 if (ai->min_ec > aeb->ec)
163 ai->min_ec = aeb->ec;
165 list_add_tail(&aeb->u.list, list);
171 * add_vol - create and add a new volume to ubi_attach_info.
172 * @ai: ubi_attach_info object
173 * @vol_id: VID of the new volume
174 * @used_ebs: number of used EBS
175 * @data_pad: data padding value of the new volume
176 * @vol_type: volume type
177 * @last_eb_bytes: number of bytes in the last LEB
179 * Returns the new struct ubi_ainf_volume on success.
180 * NULL indicates an error.
182 static struct ubi_ainf_volume *add_vol(struct ubi_attach_info *ai, int vol_id,
183 int used_ebs, int data_pad, u8 vol_type,
186 struct ubi_ainf_volume *av;
187 struct rb_node **p = &ai->volumes.rb_node, *parent = NULL;
191 av = rb_entry(parent, struct ubi_ainf_volume, rb);
193 if (vol_id > av->vol_id)
199 av = kmalloc(sizeof(struct ubi_ainf_volume), GFP_KERNEL);
203 av->highest_lnum = av->leb_count = av->used_ebs = 0;
205 av->data_pad = data_pad;
206 av->last_data_size = last_eb_bytes;
208 av->vol_type = vol_type;
210 if (av->vol_type == UBI_STATIC_VOLUME)
211 av->used_ebs = used_ebs;
213 dbg_bld("found volume (ID %i)", vol_id);
215 rb_link_node(&av->rb, parent, p);
216 rb_insert_color(&av->rb, &ai->volumes);
223 * assign_aeb_to_av - assigns a SEB to a given ainf_volume and removes it
224 * from it's original list.
225 * @ai: ubi_attach_info object
226 * @aeb: the to be assigned SEB
227 * @av: target scan volume
229 static void assign_aeb_to_av(struct ubi_attach_info *ai,
230 struct ubi_ainf_peb *aeb,
231 struct ubi_ainf_volume *av)
233 struct ubi_ainf_peb *tmp_aeb;
234 struct rb_node **p = &ai->volumes.rb_node, *parent = NULL;
236 p = &av->root.rb_node;
240 tmp_aeb = rb_entry(parent, struct ubi_ainf_peb, u.rb);
241 if (aeb->lnum != tmp_aeb->lnum) {
242 if (aeb->lnum < tmp_aeb->lnum)
252 list_del(&aeb->u.list);
255 rb_link_node(&aeb->u.rb, parent, p);
256 rb_insert_color(&aeb->u.rb, &av->root);
260 * update_vol - inserts or updates a LEB which was found a pool.
261 * @ubi: the UBI device object
262 * @ai: attach info object
263 * @av: the volume this LEB belongs to
264 * @new_vh: the volume header derived from new_aeb
265 * @new_aeb: the AEB to be examined
267 * Returns 0 on success, < 0 indicates an internal error.
269 static int update_vol(struct ubi_device *ubi, struct ubi_attach_info *ai,
270 struct ubi_ainf_volume *av, struct ubi_vid_hdr *new_vh,
271 struct ubi_ainf_peb *new_aeb)
273 struct rb_node **p = &av->root.rb_node, *parent = NULL;
274 struct ubi_ainf_peb *aeb, *victim;
279 aeb = rb_entry(parent, struct ubi_ainf_peb, u.rb);
281 if (be32_to_cpu(new_vh->lnum) != aeb->lnum) {
282 if (be32_to_cpu(new_vh->lnum) < aeb->lnum)
290 /* This case can happen if the fastmap gets written
291 * because of a volume change (creation, deletion, ..).
292 * Then a PEB can be within the persistent EBA and the pool.
294 if (aeb->pnum == new_aeb->pnum) {
295 ubi_assert(aeb->lnum == new_aeb->lnum);
296 kmem_cache_free(ai->aeb_slab_cache, new_aeb);
301 cmp_res = ubi_compare_lebs(ubi, aeb, new_aeb->pnum, new_vh);
305 /* new_aeb is newer */
307 victim = kmem_cache_alloc(ai->aeb_slab_cache,
312 victim->ec = aeb->ec;
313 victim->pnum = aeb->pnum;
314 list_add_tail(&victim->u.list, &ai->erase);
316 if (av->highest_lnum == be32_to_cpu(new_vh->lnum))
317 av->last_data_size = \
318 be32_to_cpu(new_vh->data_size);
320 dbg_bld("vol %i: AEB %i's PEB %i is the newer",
321 av->vol_id, aeb->lnum, new_aeb->pnum);
323 aeb->ec = new_aeb->ec;
324 aeb->pnum = new_aeb->pnum;
325 aeb->copy_flag = new_vh->copy_flag;
326 aeb->scrub = new_aeb->scrub;
327 kmem_cache_free(ai->aeb_slab_cache, new_aeb);
329 /* new_aeb is older */
331 dbg_bld("vol %i: AEB %i's PEB %i is old, dropping it",
332 av->vol_id, aeb->lnum, new_aeb->pnum);
333 list_add_tail(&new_aeb->u.list, &ai->erase);
338 /* This LEB is new, let's add it to the volume */
340 if (av->highest_lnum <= be32_to_cpu(new_vh->lnum)) {
341 av->highest_lnum = be32_to_cpu(new_vh->lnum);
342 av->last_data_size = be32_to_cpu(new_vh->data_size);
345 if (av->vol_type == UBI_STATIC_VOLUME)
346 av->used_ebs = be32_to_cpu(new_vh->used_ebs);
350 rb_link_node(&new_aeb->u.rb, parent, p);
351 rb_insert_color(&new_aeb->u.rb, &av->root);
357 * process_pool_aeb - we found a non-empty PEB in a pool.
358 * @ubi: UBI device object
359 * @ai: attach info object
360 * @new_vh: the volume header derived from new_aeb
361 * @new_aeb: the AEB to be examined
363 * Returns 0 on success, < 0 indicates an internal error.
365 static int process_pool_aeb(struct ubi_device *ubi, struct ubi_attach_info *ai,
366 struct ubi_vid_hdr *new_vh,
367 struct ubi_ainf_peb *new_aeb)
369 struct ubi_ainf_volume *av, *tmp_av = NULL;
370 struct rb_node **p = &ai->volumes.rb_node, *parent = NULL;
373 if (be32_to_cpu(new_vh->vol_id) == UBI_FM_SB_VOLUME_ID ||
374 be32_to_cpu(new_vh->vol_id) == UBI_FM_DATA_VOLUME_ID) {
375 kmem_cache_free(ai->aeb_slab_cache, new_aeb);
380 /* Find the volume this SEB belongs to */
383 tmp_av = rb_entry(parent, struct ubi_ainf_volume, rb);
385 if (be32_to_cpu(new_vh->vol_id) > tmp_av->vol_id)
387 else if (be32_to_cpu(new_vh->vol_id) < tmp_av->vol_id)
398 ubi_err(ubi, "orphaned volume in fastmap pool!");
399 kmem_cache_free(ai->aeb_slab_cache, new_aeb);
400 return UBI_BAD_FASTMAP;
403 ubi_assert(be32_to_cpu(new_vh->vol_id) == av->vol_id);
405 return update_vol(ubi, ai, av, new_vh, new_aeb);
409 * unmap_peb - unmap a PEB.
410 * If fastmap detects a free PEB in the pool it has to check whether
411 * this PEB has been unmapped after writing the fastmap.
413 * @ai: UBI attach info object
414 * @pnum: The PEB to be unmapped
416 static void unmap_peb(struct ubi_attach_info *ai, int pnum)
418 struct ubi_ainf_volume *av;
419 struct rb_node *node, *node2;
420 struct ubi_ainf_peb *aeb;
422 for (node = rb_first(&ai->volumes); node; node = rb_next(node)) {
423 av = rb_entry(node, struct ubi_ainf_volume, rb);
425 for (node2 = rb_first(&av->root); node2;
426 node2 = rb_next(node2)) {
427 aeb = rb_entry(node2, struct ubi_ainf_peb, u.rb);
428 if (aeb->pnum == pnum) {
429 rb_erase(&aeb->u.rb, &av->root);
431 kmem_cache_free(ai->aeb_slab_cache, aeb);
439 * scan_pool - scans a pool for changed (no longer empty PEBs).
440 * @ubi: UBI device object
441 * @ai: attach info object
442 * @pebs: an array of all PEB numbers in the to be scanned pool
443 * @pool_size: size of the pool (number of entries in @pebs)
444 * @max_sqnum: pointer to the maximal sequence number
445 * @free: list of PEBs which are most likely free (and go into @ai->free)
447 * Returns 0 on success, if the pool is unusable UBI_BAD_FASTMAP is returned.
448 * < 0 indicates an internal error.
450 static int scan_pool(struct ubi_device *ubi, struct ubi_attach_info *ai,
451 int *pebs, int pool_size, unsigned long long *max_sqnum,
452 struct list_head *free)
454 struct ubi_vid_hdr *vh;
455 struct ubi_ec_hdr *ech;
456 struct ubi_ainf_peb *new_aeb;
457 int i, pnum, err, ret = 0;
459 ech = kzalloc(ubi->ec_hdr_alsize, GFP_KERNEL);
463 vh = ubi_zalloc_vid_hdr(ubi, GFP_KERNEL);
469 dbg_bld("scanning fastmap pool: size = %i", pool_size);
472 * Now scan all PEBs in the pool to find changes which have been made
473 * after the creation of the fastmap
475 for (i = 0; i < pool_size; i++) {
479 pnum = be32_to_cpu(pebs[i]);
481 if (ubi_io_is_bad(ubi, pnum)) {
482 ubi_err(ubi, "bad PEB in fastmap pool!");
483 ret = UBI_BAD_FASTMAP;
487 err = ubi_io_read_ec_hdr(ubi, pnum, ech, 0);
488 if (err && err != UBI_IO_BITFLIPS) {
489 ubi_err(ubi, "unable to read EC header! PEB:%i err:%i",
491 ret = err > 0 ? UBI_BAD_FASTMAP : err;
493 } else if (err == UBI_IO_BITFLIPS)
497 * Older UBI implementations have image_seq set to zero, so
498 * we shouldn't fail if image_seq == 0.
500 image_seq = be32_to_cpu(ech->image_seq);
502 if (image_seq && (image_seq != ubi->image_seq)) {
503 ubi_err(ubi, "bad image seq: 0x%x, expected: 0x%x",
504 be32_to_cpu(ech->image_seq), ubi->image_seq);
505 ret = UBI_BAD_FASTMAP;
509 err = ubi_io_read_vid_hdr(ubi, pnum, vh, 0);
510 if (err == UBI_IO_FF || err == UBI_IO_FF_BITFLIPS) {
511 unsigned long long ec = be64_to_cpu(ech->ec);
513 dbg_bld("Adding PEB to free: %i", pnum);
514 if (err == UBI_IO_FF_BITFLIPS)
515 add_aeb(ai, free, pnum, ec, 1);
517 add_aeb(ai, free, pnum, ec, 0);
519 } else if (err == 0 || err == UBI_IO_BITFLIPS) {
520 dbg_bld("Found non empty PEB:%i in pool", pnum);
522 if (err == UBI_IO_BITFLIPS)
525 new_aeb = kmem_cache_alloc(ai->aeb_slab_cache,
532 new_aeb->ec = be64_to_cpu(ech->ec);
533 new_aeb->pnum = pnum;
534 new_aeb->lnum = be32_to_cpu(vh->lnum);
535 new_aeb->sqnum = be64_to_cpu(vh->sqnum);
536 new_aeb->copy_flag = vh->copy_flag;
537 new_aeb->scrub = scrub;
539 if (*max_sqnum < new_aeb->sqnum)
540 *max_sqnum = new_aeb->sqnum;
542 err = process_pool_aeb(ubi, ai, vh, new_aeb);
544 ret = err > 0 ? UBI_BAD_FASTMAP : err;
548 /* We are paranoid and fall back to scanning mode */
549 ubi_err(ubi, "fastmap pool PEBs contains damaged PEBs!");
550 ret = err > 0 ? UBI_BAD_FASTMAP : err;
557 ubi_free_vid_hdr(ubi, vh);
563 * count_fastmap_pebs - Counts the PEBs found by fastmap.
564 * @ai: The UBI attach info object
566 static int count_fastmap_pebs(struct ubi_attach_info *ai)
568 struct ubi_ainf_peb *aeb;
569 struct ubi_ainf_volume *av;
570 struct rb_node *rb1, *rb2;
573 list_for_each_entry(aeb, &ai->erase, u.list)
576 list_for_each_entry(aeb, &ai->free, u.list)
579 ubi_rb_for_each_entry(rb1, av, &ai->volumes, rb)
580 ubi_rb_for_each_entry(rb2, aeb, &av->root, u.rb)
587 * ubi_attach_fastmap - creates ubi_attach_info from a fastmap.
588 * @ubi: UBI device object
589 * @ai: UBI attach info object
590 * @fm: the fastmap to be attached
592 * Returns 0 on success, UBI_BAD_FASTMAP if the found fastmap was unusable.
593 * < 0 indicates an internal error.
595 static int ubi_attach_fastmap(struct ubi_device *ubi,
596 struct ubi_attach_info *ai,
597 struct ubi_fastmap_layout *fm)
599 struct list_head used, free;
600 struct ubi_ainf_volume *av;
601 struct ubi_ainf_peb *aeb, *tmp_aeb, *_tmp_aeb;
602 struct ubi_fm_sb *fmsb;
603 struct ubi_fm_hdr *fmhdr;
604 struct ubi_fm_scan_pool *fmpl, *fmpl_wl;
605 struct ubi_fm_ec *fmec;
606 struct ubi_fm_volhdr *fmvhdr;
607 struct ubi_fm_eba *fm_eba;
608 int ret, i, j, pool_size, wl_pool_size;
609 size_t fm_pos = 0, fm_size = ubi->fm_size;
610 unsigned long long max_sqnum = 0;
611 void *fm_raw = ubi->fm_buf;
613 INIT_LIST_HEAD(&used);
614 INIT_LIST_HEAD(&free);
615 ai->min_ec = UBI_MAX_ERASECOUNTER;
617 fmsb = (struct ubi_fm_sb *)(fm_raw);
618 ai->max_sqnum = fmsb->sqnum;
619 fm_pos += sizeof(struct ubi_fm_sb);
620 if (fm_pos >= fm_size)
623 fmhdr = (struct ubi_fm_hdr *)(fm_raw + fm_pos);
624 fm_pos += sizeof(*fmhdr);
625 if (fm_pos >= fm_size)
628 if (be32_to_cpu(fmhdr->magic) != UBI_FM_HDR_MAGIC) {
629 ubi_err(ubi, "bad fastmap header magic: 0x%x, expected: 0x%x",
630 be32_to_cpu(fmhdr->magic), UBI_FM_HDR_MAGIC);
634 fmpl = (struct ubi_fm_scan_pool *)(fm_raw + fm_pos);
635 fm_pos += sizeof(*fmpl);
636 if (fm_pos >= fm_size)
638 if (be32_to_cpu(fmpl->magic) != UBI_FM_POOL_MAGIC) {
639 ubi_err(ubi, "bad fastmap pool magic: 0x%x, expected: 0x%x",
640 be32_to_cpu(fmpl->magic), UBI_FM_POOL_MAGIC);
644 fmpl_wl = (struct ubi_fm_scan_pool *)(fm_raw + fm_pos);
645 fm_pos += sizeof(*fmpl_wl);
646 if (fm_pos >= fm_size)
648 if (be32_to_cpu(fmpl_wl->magic) != UBI_FM_POOL_MAGIC) {
649 ubi_err(ubi, "bad fastmap WL pool magic: 0x%x, expected: 0x%x",
650 be32_to_cpu(fmpl_wl->magic), UBI_FM_POOL_MAGIC);
654 pool_size = be16_to_cpu(fmpl->size);
655 wl_pool_size = be16_to_cpu(fmpl_wl->size);
656 fm->max_pool_size = be16_to_cpu(fmpl->max_size);
657 fm->max_wl_pool_size = be16_to_cpu(fmpl_wl->max_size);
659 if (pool_size > UBI_FM_MAX_POOL_SIZE || pool_size < 0) {
660 ubi_err(ubi, "bad pool size: %i", pool_size);
664 if (wl_pool_size > UBI_FM_MAX_POOL_SIZE || wl_pool_size < 0) {
665 ubi_err(ubi, "bad WL pool size: %i", wl_pool_size);
670 if (fm->max_pool_size > UBI_FM_MAX_POOL_SIZE ||
671 fm->max_pool_size < 0) {
672 ubi_err(ubi, "bad maximal pool size: %i", fm->max_pool_size);
676 if (fm->max_wl_pool_size > UBI_FM_MAX_POOL_SIZE ||
677 fm->max_wl_pool_size < 0) {
678 ubi_err(ubi, "bad maximal WL pool size: %i",
679 fm->max_wl_pool_size);
683 /* read EC values from free list */
684 for (i = 0; i < be32_to_cpu(fmhdr->free_peb_count); i++) {
685 fmec = (struct ubi_fm_ec *)(fm_raw + fm_pos);
686 fm_pos += sizeof(*fmec);
687 if (fm_pos >= fm_size)
690 add_aeb(ai, &ai->free, be32_to_cpu(fmec->pnum),
691 be32_to_cpu(fmec->ec), 0);
694 /* read EC values from used list */
695 for (i = 0; i < be32_to_cpu(fmhdr->used_peb_count); i++) {
696 fmec = (struct ubi_fm_ec *)(fm_raw + fm_pos);
697 fm_pos += sizeof(*fmec);
698 if (fm_pos >= fm_size)
701 add_aeb(ai, &used, be32_to_cpu(fmec->pnum),
702 be32_to_cpu(fmec->ec), 0);
705 /* read EC values from scrub list */
706 for (i = 0; i < be32_to_cpu(fmhdr->scrub_peb_count); i++) {
707 fmec = (struct ubi_fm_ec *)(fm_raw + fm_pos);
708 fm_pos += sizeof(*fmec);
709 if (fm_pos >= fm_size)
712 add_aeb(ai, &used, be32_to_cpu(fmec->pnum),
713 be32_to_cpu(fmec->ec), 1);
716 /* read EC values from erase list */
717 for (i = 0; i < be32_to_cpu(fmhdr->erase_peb_count); i++) {
718 fmec = (struct ubi_fm_ec *)(fm_raw + fm_pos);
719 fm_pos += sizeof(*fmec);
720 if (fm_pos >= fm_size)
723 add_aeb(ai, &ai->erase, be32_to_cpu(fmec->pnum),
724 be32_to_cpu(fmec->ec), 1);
727 ai->mean_ec = div_u64(ai->ec_sum, ai->ec_count);
728 ai->bad_peb_count = be32_to_cpu(fmhdr->bad_peb_count);
730 /* Iterate over all volumes and read their EBA table */
731 for (i = 0; i < be32_to_cpu(fmhdr->vol_count); i++) {
732 fmvhdr = (struct ubi_fm_volhdr *)(fm_raw + fm_pos);
733 fm_pos += sizeof(*fmvhdr);
734 if (fm_pos >= fm_size)
737 if (be32_to_cpu(fmvhdr->magic) != UBI_FM_VHDR_MAGIC) {
738 ubi_err(ubi, "bad fastmap vol header magic: 0x%x, expected: 0x%x",
739 be32_to_cpu(fmvhdr->magic), UBI_FM_VHDR_MAGIC);
743 av = add_vol(ai, be32_to_cpu(fmvhdr->vol_id),
744 be32_to_cpu(fmvhdr->used_ebs),
745 be32_to_cpu(fmvhdr->data_pad),
747 be32_to_cpu(fmvhdr->last_eb_bytes));
753 if (ai->highest_vol_id < be32_to_cpu(fmvhdr->vol_id))
754 ai->highest_vol_id = be32_to_cpu(fmvhdr->vol_id);
756 fm_eba = (struct ubi_fm_eba *)(fm_raw + fm_pos);
757 fm_pos += sizeof(*fm_eba);
758 fm_pos += (sizeof(__be32) * be32_to_cpu(fm_eba->reserved_pebs));
759 if (fm_pos >= fm_size)
762 if (be32_to_cpu(fm_eba->magic) != UBI_FM_EBA_MAGIC) {
763 ubi_err(ubi, "bad fastmap EBA header magic: 0x%x, expected: 0x%x",
764 be32_to_cpu(fm_eba->magic), UBI_FM_EBA_MAGIC);
768 for (j = 0; j < be32_to_cpu(fm_eba->reserved_pebs); j++) {
769 int pnum = be32_to_cpu(fm_eba->pnum[j]);
771 if ((int)be32_to_cpu(fm_eba->pnum[j]) < 0)
775 list_for_each_entry(tmp_aeb, &used, u.list) {
776 if (tmp_aeb->pnum == pnum) {
783 ubi_err(ubi, "PEB %i is in EBA but not in used list", pnum);
789 if (av->highest_lnum <= aeb->lnum)
790 av->highest_lnum = aeb->lnum;
792 assign_aeb_to_av(ai, aeb, av);
794 dbg_bld("inserting PEB:%i (LEB %i) to vol %i",
795 aeb->pnum, aeb->lnum, av->vol_id);
799 ret = scan_pool(ubi, ai, fmpl->pebs, pool_size, &max_sqnum, &free);
803 ret = scan_pool(ubi, ai, fmpl_wl->pebs, wl_pool_size, &max_sqnum, &free);
807 if (max_sqnum > ai->max_sqnum)
808 ai->max_sqnum = max_sqnum;
810 list_for_each_entry_safe(tmp_aeb, _tmp_aeb, &free, u.list)
811 list_move_tail(&tmp_aeb->u.list, &ai->free);
813 list_for_each_entry_safe(tmp_aeb, _tmp_aeb, &used, u.list)
814 list_move_tail(&tmp_aeb->u.list, &ai->erase);
816 ubi_assert(list_empty(&free));
819 * If fastmap is leaking PEBs (must not happen), raise a
820 * fat warning and fall back to scanning mode.
821 * We do this here because in ubi_wl_init() it's too late
822 * and we cannot fall back to scanning.
824 if (WARN_ON(count_fastmap_pebs(ai) != ubi->peb_count -
825 ai->bad_peb_count - fm->used_blocks))
831 ret = UBI_BAD_FASTMAP;
833 list_for_each_entry_safe(tmp_aeb, _tmp_aeb, &used, u.list) {
834 list_del(&tmp_aeb->u.list);
835 kmem_cache_free(ai->aeb_slab_cache, tmp_aeb);
837 list_for_each_entry_safe(tmp_aeb, _tmp_aeb, &free, u.list) {
838 list_del(&tmp_aeb->u.list);
839 kmem_cache_free(ai->aeb_slab_cache, tmp_aeb);
846 * ubi_scan_fastmap - scan the fastmap.
847 * @ubi: UBI device object
848 * @ai: UBI attach info to be filled
849 * @fm_anchor: The fastmap starts at this PEB
851 * Returns 0 on success, UBI_NO_FASTMAP if no fastmap was found,
852 * UBI_BAD_FASTMAP if one was found but is not usable.
853 * < 0 indicates an internal error.
855 int ubi_scan_fastmap(struct ubi_device *ubi, struct ubi_attach_info *ai,
858 struct ubi_fm_sb *fmsb, *fmsb2;
859 struct ubi_vid_hdr *vh;
860 struct ubi_ec_hdr *ech;
861 struct ubi_fastmap_layout *fm;
862 int i, used_blocks, pnum, ret = 0;
865 unsigned long long sqnum = 0;
867 down_write(&ubi->fm_protect);
868 memset(ubi->fm_buf, 0, ubi->fm_size);
870 fmsb = kmalloc(sizeof(*fmsb), GFP_KERNEL);
876 fm = kzalloc(sizeof(*fm), GFP_KERNEL);
883 ret = ubi_io_read(ubi, fmsb, fm_anchor, ubi->leb_start, sizeof(*fmsb));
884 if (ret && ret != UBI_IO_BITFLIPS)
886 else if (ret == UBI_IO_BITFLIPS)
887 fm->to_be_tortured[0] = 1;
889 if (be32_to_cpu(fmsb->magic) != UBI_FM_SB_MAGIC) {
890 ubi_err(ubi, "bad super block magic: 0x%x, expected: 0x%x",
891 be32_to_cpu(fmsb->magic), UBI_FM_SB_MAGIC);
892 ret = UBI_BAD_FASTMAP;
896 if (fmsb->version != UBI_FM_FMT_VERSION) {
897 ubi_err(ubi, "bad fastmap version: %i, expected: %i",
898 fmsb->version, UBI_FM_FMT_VERSION);
899 ret = UBI_BAD_FASTMAP;
903 used_blocks = be32_to_cpu(fmsb->used_blocks);
904 if (used_blocks > UBI_FM_MAX_BLOCKS || used_blocks < 1) {
905 ubi_err(ubi, "number of fastmap blocks is invalid: %i",
907 ret = UBI_BAD_FASTMAP;
911 fm_size = ubi->leb_size * used_blocks;
912 if (fm_size != ubi->fm_size) {
913 ubi_err(ubi, "bad fastmap size: %zi, expected: %zi",
914 fm_size, ubi->fm_size);
915 ret = UBI_BAD_FASTMAP;
919 ech = kzalloc(ubi->ec_hdr_alsize, GFP_KERNEL);
925 vh = ubi_zalloc_vid_hdr(ubi, GFP_KERNEL);
931 for (i = 0; i < used_blocks; i++) {
934 pnum = be32_to_cpu(fmsb->block_loc[i]);
936 if (ubi_io_is_bad(ubi, pnum)) {
937 ret = UBI_BAD_FASTMAP;
941 ret = ubi_io_read_ec_hdr(ubi, pnum, ech, 0);
942 if (ret && ret != UBI_IO_BITFLIPS) {
943 ubi_err(ubi, "unable to read fastmap block# %i EC (PEB: %i)",
946 ret = UBI_BAD_FASTMAP;
948 } else if (ret == UBI_IO_BITFLIPS)
949 fm->to_be_tortured[i] = 1;
951 image_seq = be32_to_cpu(ech->image_seq);
953 ubi->image_seq = image_seq;
956 * Older UBI implementations have image_seq set to zero, so
957 * we shouldn't fail if image_seq == 0.
959 if (image_seq && (image_seq != ubi->image_seq)) {
960 ubi_err(ubi, "wrong image seq:%d instead of %d",
961 be32_to_cpu(ech->image_seq), ubi->image_seq);
962 ret = UBI_BAD_FASTMAP;
966 ret = ubi_io_read_vid_hdr(ubi, pnum, vh, 0);
967 if (ret && ret != UBI_IO_BITFLIPS) {
968 ubi_err(ubi, "unable to read fastmap block# %i (PEB: %i)",
974 if (be32_to_cpu(vh->vol_id) != UBI_FM_SB_VOLUME_ID) {
975 ubi_err(ubi, "bad fastmap anchor vol_id: 0x%x, expected: 0x%x",
976 be32_to_cpu(vh->vol_id),
977 UBI_FM_SB_VOLUME_ID);
978 ret = UBI_BAD_FASTMAP;
982 if (be32_to_cpu(vh->vol_id) != UBI_FM_DATA_VOLUME_ID) {
983 ubi_err(ubi, "bad fastmap data vol_id: 0x%x, expected: 0x%x",
984 be32_to_cpu(vh->vol_id),
985 UBI_FM_DATA_VOLUME_ID);
986 ret = UBI_BAD_FASTMAP;
991 if (sqnum < be64_to_cpu(vh->sqnum))
992 sqnum = be64_to_cpu(vh->sqnum);
994 ret = ubi_io_read(ubi, ubi->fm_buf + (ubi->leb_size * i), pnum,
995 ubi->leb_start, ubi->leb_size);
996 if (ret && ret != UBI_IO_BITFLIPS) {
997 ubi_err(ubi, "unable to read fastmap block# %i (PEB: %i, "
998 "err: %i)", i, pnum, ret);
1006 fmsb2 = (struct ubi_fm_sb *)(ubi->fm_buf);
1007 tmp_crc = be32_to_cpu(fmsb2->data_crc);
1008 fmsb2->data_crc = 0;
1009 crc = crc32(UBI_CRC32_INIT, ubi->fm_buf, fm_size);
1010 if (crc != tmp_crc) {
1011 ubi_err(ubi, "fastmap data CRC is invalid");
1012 ubi_err(ubi, "CRC should be: 0x%x, calc: 0x%x",
1014 ret = UBI_BAD_FASTMAP;
1018 fmsb2->sqnum = sqnum;
1020 fm->used_blocks = used_blocks;
1022 ret = ubi_attach_fastmap(ubi, ai, fm);
1025 ret = UBI_BAD_FASTMAP;
1029 for (i = 0; i < used_blocks; i++) {
1030 struct ubi_wl_entry *e;
1032 e = kmem_cache_alloc(ubi_wl_entry_slab, GFP_KERNEL);
1041 e->pnum = be32_to_cpu(fmsb2->block_loc[i]);
1042 e->ec = be32_to_cpu(fmsb2->block_ec[i]);
1047 ubi->fm_pool.max_size = ubi->fm->max_pool_size;
1048 ubi->fm_wl_pool.max_size = ubi->fm->max_wl_pool_size;
1049 ubi_msg(ubi, "attached by fastmap");
1050 ubi_msg(ubi, "fastmap pool size: %d", ubi->fm_pool.max_size);
1051 ubi_msg(ubi, "fastmap WL pool size: %d",
1052 ubi->fm_wl_pool.max_size);
1053 ubi->fm_disabled = 0;
1055 ubi_free_vid_hdr(ubi, vh);
1058 up_write(&ubi->fm_protect);
1059 if (ret == UBI_BAD_FASTMAP)
1060 ubi_err(ubi, "Attach by fastmap failed, doing a full scan!");
1064 ubi_free_vid_hdr(ubi, vh);
1073 * ubi_write_fastmap - writes a fastmap.
1074 * @ubi: UBI device object
1075 * @new_fm: the to be written fastmap
1077 * Returns 0 on success, < 0 indicates an internal error.
1079 static int ubi_write_fastmap(struct ubi_device *ubi,
1080 struct ubi_fastmap_layout *new_fm)
1084 struct ubi_fm_sb *fmsb;
1085 struct ubi_fm_hdr *fmh;
1086 struct ubi_fm_scan_pool *fmpl, *fmpl_wl;
1087 struct ubi_fm_ec *fec;
1088 struct ubi_fm_volhdr *fvh;
1089 struct ubi_fm_eba *feba;
1090 struct ubi_wl_entry *wl_e;
1091 struct ubi_volume *vol;
1092 struct ubi_vid_hdr *avhdr, *dvhdr;
1093 struct ubi_work *ubi_wrk;
1094 struct rb_node *tmp_rb;
1095 int ret, i, j, free_peb_count, used_peb_count, vol_count;
1096 int scrub_peb_count, erase_peb_count;
1097 int *seen_pebs = NULL;
1099 fm_raw = ubi->fm_buf;
1100 memset(ubi->fm_buf, 0, ubi->fm_size);
1102 avhdr = new_fm_vhdr(ubi, UBI_FM_SB_VOLUME_ID);
1108 dvhdr = new_fm_vhdr(ubi, UBI_FM_DATA_VOLUME_ID);
1114 seen_pebs = init_seen(ubi);
1115 if (IS_ERR(seen_pebs)) {
1116 ret = PTR_ERR(seen_pebs);
1120 spin_lock(&ubi->volumes_lock);
1121 spin_lock(&ubi->wl_lock);
1123 fmsb = (struct ubi_fm_sb *)fm_raw;
1124 fm_pos += sizeof(*fmsb);
1125 ubi_assert(fm_pos <= ubi->fm_size);
1127 fmh = (struct ubi_fm_hdr *)(fm_raw + fm_pos);
1128 fm_pos += sizeof(*fmh);
1129 ubi_assert(fm_pos <= ubi->fm_size);
1131 fmsb->magic = cpu_to_be32(UBI_FM_SB_MAGIC);
1132 fmsb->version = UBI_FM_FMT_VERSION;
1133 fmsb->used_blocks = cpu_to_be32(new_fm->used_blocks);
1134 /* the max sqnum will be filled in while *reading* the fastmap */
1137 fmh->magic = cpu_to_be32(UBI_FM_HDR_MAGIC);
1140 scrub_peb_count = 0;
1141 erase_peb_count = 0;
1144 fmpl = (struct ubi_fm_scan_pool *)(fm_raw + fm_pos);
1145 fm_pos += sizeof(*fmpl);
1146 fmpl->magic = cpu_to_be32(UBI_FM_POOL_MAGIC);
1147 fmpl->size = cpu_to_be16(ubi->fm_pool.size);
1148 fmpl->max_size = cpu_to_be16(ubi->fm_pool.max_size);
1150 for (i = 0; i < ubi->fm_pool.size; i++) {
1151 fmpl->pebs[i] = cpu_to_be32(ubi->fm_pool.pebs[i]);
1152 set_seen(ubi, ubi->fm_pool.pebs[i], seen_pebs);
1155 fmpl_wl = (struct ubi_fm_scan_pool *)(fm_raw + fm_pos);
1156 fm_pos += sizeof(*fmpl_wl);
1157 fmpl_wl->magic = cpu_to_be32(UBI_FM_POOL_MAGIC);
1158 fmpl_wl->size = cpu_to_be16(ubi->fm_wl_pool.size);
1159 fmpl_wl->max_size = cpu_to_be16(ubi->fm_wl_pool.max_size);
1161 for (i = 0; i < ubi->fm_wl_pool.size; i++) {
1162 fmpl_wl->pebs[i] = cpu_to_be32(ubi->fm_wl_pool.pebs[i]);
1163 set_seen(ubi, ubi->fm_wl_pool.pebs[i], seen_pebs);
1166 ubi_for_each_free_peb(ubi, wl_e, tmp_rb) {
1167 fec = (struct ubi_fm_ec *)(fm_raw + fm_pos);
1169 fec->pnum = cpu_to_be32(wl_e->pnum);
1170 set_seen(ubi, wl_e->pnum, seen_pebs);
1171 fec->ec = cpu_to_be32(wl_e->ec);
1174 fm_pos += sizeof(*fec);
1175 ubi_assert(fm_pos <= ubi->fm_size);
1177 fmh->free_peb_count = cpu_to_be32(free_peb_count);
1179 ubi_for_each_used_peb(ubi, wl_e, tmp_rb) {
1180 fec = (struct ubi_fm_ec *)(fm_raw + fm_pos);
1182 fec->pnum = cpu_to_be32(wl_e->pnum);
1183 set_seen(ubi, wl_e->pnum, seen_pebs);
1184 fec->ec = cpu_to_be32(wl_e->ec);
1187 fm_pos += sizeof(*fec);
1188 ubi_assert(fm_pos <= ubi->fm_size);
1191 ubi_for_each_protected_peb(ubi, i, wl_e) {
1192 fec = (struct ubi_fm_ec *)(fm_raw + fm_pos);
1194 fec->pnum = cpu_to_be32(wl_e->pnum);
1195 set_seen(ubi, wl_e->pnum, seen_pebs);
1196 fec->ec = cpu_to_be32(wl_e->ec);
1199 fm_pos += sizeof(*fec);
1200 ubi_assert(fm_pos <= ubi->fm_size);
1202 fmh->used_peb_count = cpu_to_be32(used_peb_count);
1204 ubi_for_each_scrub_peb(ubi, wl_e, tmp_rb) {
1205 fec = (struct ubi_fm_ec *)(fm_raw + fm_pos);
1207 fec->pnum = cpu_to_be32(wl_e->pnum);
1208 set_seen(ubi, wl_e->pnum, seen_pebs);
1209 fec->ec = cpu_to_be32(wl_e->ec);
1212 fm_pos += sizeof(*fec);
1213 ubi_assert(fm_pos <= ubi->fm_size);
1215 fmh->scrub_peb_count = cpu_to_be32(scrub_peb_count);
1218 list_for_each_entry(ubi_wrk, &ubi->works, list) {
1219 if (ubi_is_erase_work(ubi_wrk)) {
1223 fec = (struct ubi_fm_ec *)(fm_raw + fm_pos);
1225 fec->pnum = cpu_to_be32(wl_e->pnum);
1226 set_seen(ubi, wl_e->pnum, seen_pebs);
1227 fec->ec = cpu_to_be32(wl_e->ec);
1230 fm_pos += sizeof(*fec);
1231 ubi_assert(fm_pos <= ubi->fm_size);
1234 fmh->erase_peb_count = cpu_to_be32(erase_peb_count);
1236 for (i = 0; i < UBI_MAX_VOLUMES + UBI_INT_VOL_COUNT; i++) {
1237 vol = ubi->volumes[i];
1244 fvh = (struct ubi_fm_volhdr *)(fm_raw + fm_pos);
1245 fm_pos += sizeof(*fvh);
1246 ubi_assert(fm_pos <= ubi->fm_size);
1248 fvh->magic = cpu_to_be32(UBI_FM_VHDR_MAGIC);
1249 fvh->vol_id = cpu_to_be32(vol->vol_id);
1250 fvh->vol_type = vol->vol_type;
1251 fvh->used_ebs = cpu_to_be32(vol->used_ebs);
1252 fvh->data_pad = cpu_to_be32(vol->data_pad);
1253 fvh->last_eb_bytes = cpu_to_be32(vol->last_eb_bytes);
1255 ubi_assert(vol->vol_type == UBI_DYNAMIC_VOLUME ||
1256 vol->vol_type == UBI_STATIC_VOLUME);
1258 feba = (struct ubi_fm_eba *)(fm_raw + fm_pos);
1259 fm_pos += sizeof(*feba) + (sizeof(__be32) * vol->reserved_pebs);
1260 ubi_assert(fm_pos <= ubi->fm_size);
1262 for (j = 0; j < vol->reserved_pebs; j++)
1263 feba->pnum[j] = cpu_to_be32(vol->eba_tbl[j]);
1265 feba->reserved_pebs = cpu_to_be32(j);
1266 feba->magic = cpu_to_be32(UBI_FM_EBA_MAGIC);
1268 fmh->vol_count = cpu_to_be32(vol_count);
1269 fmh->bad_peb_count = cpu_to_be32(ubi->bad_peb_count);
1271 avhdr->sqnum = cpu_to_be64(ubi_next_sqnum(ubi));
1274 spin_unlock(&ubi->wl_lock);
1275 spin_unlock(&ubi->volumes_lock);
1277 dbg_bld("writing fastmap SB to PEB %i", new_fm->e[0]->pnum);
1278 ret = ubi_io_write_vid_hdr(ubi, new_fm->e[0]->pnum, avhdr);
1280 ubi_err(ubi, "unable to write vid_hdr to fastmap SB!");
1284 for (i = 0; i < new_fm->used_blocks; i++) {
1285 fmsb->block_loc[i] = cpu_to_be32(new_fm->e[i]->pnum);
1286 set_seen(ubi, new_fm->e[i]->pnum, seen_pebs);
1287 fmsb->block_ec[i] = cpu_to_be32(new_fm->e[i]->ec);
1291 fmsb->data_crc = cpu_to_be32(crc32(UBI_CRC32_INIT, fm_raw,
1294 for (i = 1; i < new_fm->used_blocks; i++) {
1295 dvhdr->sqnum = cpu_to_be64(ubi_next_sqnum(ubi));
1296 dvhdr->lnum = cpu_to_be32(i);
1297 dbg_bld("writing fastmap data to PEB %i sqnum %llu",
1298 new_fm->e[i]->pnum, be64_to_cpu(dvhdr->sqnum));
1299 ret = ubi_io_write_vid_hdr(ubi, new_fm->e[i]->pnum, dvhdr);
1301 ubi_err(ubi, "unable to write vid_hdr to PEB %i!",
1302 new_fm->e[i]->pnum);
1307 for (i = 0; i < new_fm->used_blocks; i++) {
1308 ret = ubi_io_write(ubi, fm_raw + (i * ubi->leb_size),
1309 new_fm->e[i]->pnum, ubi->leb_start, ubi->leb_size);
1311 ubi_err(ubi, "unable to write fastmap to PEB %i!",
1312 new_fm->e[i]->pnum);
1320 ret = self_check_seen(ubi, seen_pebs);
1321 dbg_bld("fastmap written!");
1324 ubi_free_vid_hdr(ubi, avhdr);
1325 ubi_free_vid_hdr(ubi, dvhdr);
1326 free_seen(seen_pebs);
1332 * erase_block - Manually erase a PEB.
1333 * @ubi: UBI device object
1334 * @pnum: PEB to be erased
1336 * Returns the new EC value on success, < 0 indicates an internal error.
1338 static int erase_block(struct ubi_device *ubi, int pnum)
1341 struct ubi_ec_hdr *ec_hdr;
1344 ec_hdr = kzalloc(ubi->ec_hdr_alsize, GFP_KERNEL);
1348 ret = ubi_io_read_ec_hdr(ubi, pnum, ec_hdr, 0);
1351 else if (ret && ret != UBI_IO_BITFLIPS) {
1356 ret = ubi_io_sync_erase(ubi, pnum, 0);
1360 ec = be64_to_cpu(ec_hdr->ec);
1362 if (ec > UBI_MAX_ERASECOUNTER) {
1367 ec_hdr->ec = cpu_to_be64(ec);
1368 ret = ubi_io_write_ec_hdr(ubi, pnum, ec_hdr);
1379 * invalidate_fastmap - destroys a fastmap.
1380 * @ubi: UBI device object
1382 * This function ensures that upon next UBI attach a full scan
1383 * is issued. We need this if UBI is about to write a new fastmap
1384 * but is unable to do so. In this case we have two options:
1385 * a) Make sure that the current fastmap will not be usued upon
1386 * attach time and contine or b) fall back to RO mode to have the
1387 * current fastmap in a valid state.
1388 * Returns 0 on success, < 0 indicates an internal error.
1390 static int invalidate_fastmap(struct ubi_device *ubi)
1393 struct ubi_fastmap_layout *fm;
1394 struct ubi_wl_entry *e;
1395 struct ubi_vid_hdr *vh = NULL;
1403 fm = kzalloc(sizeof(*fm), GFP_KERNEL);
1407 vh = new_fm_vhdr(ubi, UBI_FM_SB_VOLUME_ID);
1412 e = ubi_wl_get_fm_peb(ubi, 1);
1417 * Create fake fastmap such that UBI will fall back
1420 vh->sqnum = cpu_to_be64(ubi_next_sqnum(ubi));
1421 ret = ubi_io_write_vid_hdr(ubi, e->pnum, vh);
1423 ubi_wl_put_fm_peb(ubi, e, 0, 0);
1427 fm->used_blocks = 1;
1433 ubi_free_vid_hdr(ubi, vh);
1442 * return_fm_pebs - returns all PEBs used by a fastmap back to the
1444 * @ubi: UBI device object
1445 * @fm: fastmap layout object
1447 static void return_fm_pebs(struct ubi_device *ubi,
1448 struct ubi_fastmap_layout *fm)
1455 for (i = 0; i < fm->used_blocks; i++) {
1457 ubi_wl_put_fm_peb(ubi, fm->e[i], i,
1458 fm->to_be_tortured[i]);
1465 * ubi_update_fastmap - will be called by UBI if a volume changes or
1466 * a fastmap pool becomes full.
1467 * @ubi: UBI device object
1469 * Returns 0 on success, < 0 indicates an internal error.
1471 int ubi_update_fastmap(struct ubi_device *ubi)
1474 struct ubi_fastmap_layout *new_fm, *old_fm;
1475 struct ubi_wl_entry *tmp_e;
1477 down_write(&ubi->fm_protect);
1479 ubi_refill_pools(ubi);
1481 if (ubi->ro_mode || ubi->fm_disabled) {
1482 up_write(&ubi->fm_protect);
1486 ret = ubi_ensure_anchor_pebs(ubi);
1488 up_write(&ubi->fm_protect);
1492 new_fm = kzalloc(sizeof(*new_fm), GFP_KERNEL);
1494 up_write(&ubi->fm_protect);
1498 new_fm->used_blocks = ubi->fm_size / ubi->leb_size;
1502 if (new_fm->used_blocks > UBI_FM_MAX_BLOCKS) {
1503 ubi_err(ubi, "fastmap too large");
1508 for (i = 1; i < new_fm->used_blocks; i++) {
1509 spin_lock(&ubi->wl_lock);
1510 tmp_e = ubi_wl_get_fm_peb(ubi, 0);
1511 spin_unlock(&ubi->wl_lock);
1514 if (old_fm && old_fm->e[i]) {
1515 ret = erase_block(ubi, old_fm->e[i]->pnum);
1517 ubi_err(ubi, "could not erase old fastmap PEB");
1519 for (j = 1; j < i; j++) {
1520 ubi_wl_put_fm_peb(ubi, new_fm->e[j],
1522 new_fm->e[j] = NULL;
1526 new_fm->e[i] = old_fm->e[i];
1527 old_fm->e[i] = NULL;
1529 ubi_err(ubi, "could not get any free erase block");
1531 for (j = 1; j < i; j++) {
1532 ubi_wl_put_fm_peb(ubi, new_fm->e[j], j, 0);
1533 new_fm->e[j] = NULL;
1540 new_fm->e[i] = tmp_e;
1542 if (old_fm && old_fm->e[i]) {
1543 ubi_wl_put_fm_peb(ubi, old_fm->e[i], i,
1544 old_fm->to_be_tortured[i]);
1545 old_fm->e[i] = NULL;
1550 /* Old fastmap is larger than the new one */
1551 if (old_fm && new_fm->used_blocks < old_fm->used_blocks) {
1552 for (i = new_fm->used_blocks; i < old_fm->used_blocks; i++) {
1553 ubi_wl_put_fm_peb(ubi, old_fm->e[i], i,
1554 old_fm->to_be_tortured[i]);
1555 old_fm->e[i] = NULL;
1559 spin_lock(&ubi->wl_lock);
1560 tmp_e = ubi_wl_get_fm_peb(ubi, 1);
1561 spin_unlock(&ubi->wl_lock);
1564 /* no fresh anchor PEB was found, reuse the old one */
1566 ret = erase_block(ubi, old_fm->e[0]->pnum);
1568 ubi_err(ubi, "could not erase old anchor PEB");
1570 for (i = 1; i < new_fm->used_blocks; i++) {
1571 ubi_wl_put_fm_peb(ubi, new_fm->e[i],
1573 new_fm->e[i] = NULL;
1577 new_fm->e[0] = old_fm->e[0];
1578 new_fm->e[0]->ec = ret;
1579 old_fm->e[0] = NULL;
1581 /* we've got a new anchor PEB, return the old one */
1582 ubi_wl_put_fm_peb(ubi, old_fm->e[0], 0,
1583 old_fm->to_be_tortured[0]);
1584 new_fm->e[0] = tmp_e;
1585 old_fm->e[0] = NULL;
1589 ubi_err(ubi, "could not find any anchor PEB");
1591 for (i = 1; i < new_fm->used_blocks; i++) {
1592 ubi_wl_put_fm_peb(ubi, new_fm->e[i], i, 0);
1593 new_fm->e[i] = NULL;
1599 new_fm->e[0] = tmp_e;
1602 down_write(&ubi->work_sem);
1603 down_write(&ubi->fm_eba_sem);
1604 ret = ubi_write_fastmap(ubi, new_fm);
1605 up_write(&ubi->fm_eba_sem);
1606 up_write(&ubi->work_sem);
1612 up_write(&ubi->fm_protect);
1617 ubi_warn(ubi, "Unable to write new fastmap, err=%i", ret);
1619 ret = invalidate_fastmap(ubi);
1621 ubi_err(ubi, "Unable to invalidiate current fastmap!");
1624 return_fm_pebs(ubi, old_fm);
1625 return_fm_pebs(ubi, new_fm);