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>
18 #include <linux/bitmap.h>
22 * init_seen - allocate memory for used for debugging.
23 * @ubi: UBI device description object
25 static inline unsigned long *init_seen(struct ubi_device *ubi)
29 if (!ubi_dbg_chk_fastmap(ubi))
32 ret = kcalloc(BITS_TO_LONGS(ubi->peb_count), sizeof(unsigned long),
35 return ERR_PTR(-ENOMEM);
41 * free_seen - free the seen logic integer array.
42 * @seen: integer array of @ubi->peb_count size
44 static inline void free_seen(unsigned long *seen)
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
55 static inline void set_seen(struct ubi_device *ubi, int pnum, unsigned long *seen)
57 if (!ubi_dbg_chk_fastmap(ubi) || !seen)
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
68 static int self_check_seen(struct ubi_device *ubi, unsigned long *seen)
72 if (!ubi_dbg_chk_fastmap(ubi) || !seen)
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);
86 * ubi_calc_fm_size - calculates the fastmap size in bytes for an UBI device.
87 * @ubi: UBI device description object
89 size_t ubi_calc_fm_size(struct ubi_device *ubi)
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);
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
110 * Returns a new struct ubi_vid_hdr on success.
111 * NULL indicates out of memory.
113 static struct ubi_vid_io_buf *new_fm_vbuf(struct ubi_device *ubi, int vol_id)
115 struct ubi_vid_io_buf *new;
116 struct ubi_vid_hdr *vh;
118 new = ubi_alloc_vid_buf(ubi, GFP_KERNEL);
122 vh = ubi_get_vid_hdr(new);
123 vh->vol_type = UBI_VID_DYNAMIC;
124 vh->vol_id = cpu_to_be32(vol_id);
126 /* UBI implementations without fastmap support have to delete the
129 vh->compat = UBI_COMPAT_DELETE;
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
143 * Returns 0 on success, < 0 indicates an internal error.
145 static int add_aeb(struct ubi_attach_info *ai, struct list_head *list,
146 int pnum, int ec, int scrub)
148 struct ubi_ainf_peb *aeb;
150 aeb = ubi_alloc_aeb(ai, pnum, ec);
156 aeb->copy_flag = aeb->sqnum = 0;
158 ai->ec_sum += aeb->ec;
161 if (ai->max_ec < aeb->ec)
162 ai->max_ec = aeb->ec;
164 if (ai->min_ec > aeb->ec)
165 ai->min_ec = aeb->ec;
167 list_add_tail(&aeb->u.list, list);
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
181 * Returns the new struct ubi_ainf_volume on success.
182 * NULL indicates an error.
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,
188 struct ubi_ainf_volume *av;
190 av = ubi_add_av(ai, vol_id);
194 av->data_pad = data_pad;
195 av->last_data_size = last_eb_bytes;
197 av->vol_type = vol_type;
198 if (av->vol_type == UBI_STATIC_VOLUME)
199 av->used_ebs = used_ebs;
201 dbg_bld("found volume (ID %i)", vol_id);
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
212 static void assign_aeb_to_av(struct ubi_attach_info *ai,
213 struct ubi_ainf_peb *aeb,
214 struct ubi_ainf_volume *av)
216 struct ubi_ainf_peb *tmp_aeb;
217 struct rb_node **p = &ai->volumes.rb_node, *parent = NULL;
219 p = &av->root.rb_node;
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)
235 list_del(&aeb->u.list);
238 rb_link_node(&aeb->u.rb, parent, p);
239 rb_insert_color(&aeb->u.rb, &av->root);
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
250 * Returns 0 on success, < 0 indicates an internal error.
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)
256 struct rb_node **p = &av->root.rb_node, *parent = NULL;
257 struct ubi_ainf_peb *aeb, *victim;
262 aeb = rb_entry(parent, struct ubi_ainf_peb, u.rb);
264 if (be32_to_cpu(new_vh->lnum) != aeb->lnum) {
265 if (be32_to_cpu(new_vh->lnum) < aeb->lnum)
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.
277 if (aeb->pnum == new_aeb->pnum) {
278 ubi_assert(aeb->lnum == new_aeb->lnum);
279 ubi_free_aeb(ai, new_aeb);
284 cmp_res = ubi_compare_lebs(ubi, aeb, new_aeb->pnum, new_vh);
288 /* new_aeb is newer */
290 victim = ubi_alloc_aeb(ai, aeb->pnum, aeb->ec);
294 list_add_tail(&victim->u.list, &ai->erase);
296 if (av->highest_lnum == be32_to_cpu(new_vh->lnum))
298 be32_to_cpu(new_vh->data_size);
300 dbg_bld("vol %i: AEB %i's PEB %i is the newer",
301 av->vol_id, aeb->lnum, new_aeb->pnum);
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);
310 /* new_aeb is older */
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);
319 /* This LEB is new, let's add it to the volume */
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);
326 if (av->vol_type == UBI_STATIC_VOLUME)
327 av->used_ebs = be32_to_cpu(new_vh->used_ebs);
331 rb_link_node(&new_aeb->u.rb, parent, p);
332 rb_insert_color(&new_aeb->u.rb, &av->root);
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
344 * Returns 0 on success, < 0 indicates an internal error.
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)
350 int vol_id = be32_to_cpu(new_vh->vol_id);
351 struct ubi_ainf_volume *av;
353 if (vol_id == UBI_FM_SB_VOLUME_ID || vol_id == UBI_FM_DATA_VOLUME_ID) {
354 ubi_free_aeb(ai, new_aeb);
359 /* Find the volume this SEB belongs to */
360 av = ubi_find_av(ai, vol_id);
362 ubi_err(ubi, "orphaned volume in fastmap pool!");
363 ubi_free_aeb(ai, new_aeb);
364 return UBI_BAD_FASTMAP;
367 ubi_assert(vol_id == av->vol_id);
369 return update_vol(ubi, ai, av, new_vh, new_aeb);
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.
377 * @ai: UBI attach info object
378 * @pnum: The PEB to be unmapped
380 static void unmap_peb(struct ubi_attach_info *ai, int pnum)
382 struct ubi_ainf_volume *av;
383 struct rb_node *node, *node2;
384 struct ubi_ainf_peb *aeb;
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);
391 ubi_free_aeb(ai, aeb);
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)
407 * Returns 0 on success, if the pool is unusable UBI_BAD_FASTMAP is returned.
408 * < 0 indicates an internal error.
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)
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;
420 ech = kzalloc(ubi->ec_hdr_alsize, GFP_KERNEL);
424 vb = ubi_alloc_vid_buf(ubi, GFP_KERNEL);
430 vh = ubi_get_vid_hdr(vb);
432 dbg_bld("scanning fastmap pool: size = %i", pool_size);
435 * Now scan all PEBs in the pool to find changes which have been made
436 * after the creation of the fastmap
438 for (i = 0; i < pool_size; i++) {
442 pnum = be32_to_cpu(pebs[i]);
444 if (ubi_io_is_bad(ubi, pnum)) {
445 ubi_err(ubi, "bad PEB in fastmap pool!");
446 ret = UBI_BAD_FASTMAP;
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",
454 ret = err > 0 ? UBI_BAD_FASTMAP : err;
456 } else if (err == UBI_IO_BITFLIPS)
460 * Older UBI implementations have image_seq set to zero, so
461 * we shouldn't fail if image_seq == 0.
463 image_seq = be32_to_cpu(ech->image_seq);
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;
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);
476 dbg_bld("Adding PEB to free: %i", pnum);
478 if (err == UBI_IO_FF_BITFLIPS)
481 ret = add_aeb(ai, free, pnum, ec, scrub);
485 } else if (err == 0 || err == UBI_IO_BITFLIPS) {
486 dbg_bld("Found non empty PEB:%i in pool", pnum);
488 if (err == UBI_IO_BITFLIPS)
491 new_aeb = ubi_alloc_aeb(ai, pnum, be64_to_cpu(ech->ec));
497 new_aeb->lnum = be32_to_cpu(vh->lnum);
498 new_aeb->sqnum = be64_to_cpu(vh->sqnum);
499 new_aeb->copy_flag = vh->copy_flag;
500 new_aeb->scrub = scrub;
502 if (*max_sqnum < new_aeb->sqnum)
503 *max_sqnum = new_aeb->sqnum;
505 err = process_pool_aeb(ubi, ai, vh, new_aeb);
507 ret = err > 0 ? UBI_BAD_FASTMAP : err;
511 /* We are paranoid and fall back to scanning mode */
512 ubi_err(ubi, "fastmap pool PEBs contains damaged PEBs!");
513 ret = err > 0 ? UBI_BAD_FASTMAP : err;
520 ubi_free_vid_buf(vb);
526 * count_fastmap_pebs - Counts the PEBs found by fastmap.
527 * @ai: The UBI attach info object
529 static int count_fastmap_pebs(struct ubi_attach_info *ai)
531 struct ubi_ainf_peb *aeb;
532 struct ubi_ainf_volume *av;
533 struct rb_node *rb1, *rb2;
536 list_for_each_entry(aeb, &ai->erase, u.list)
539 list_for_each_entry(aeb, &ai->free, u.list)
542 ubi_rb_for_each_entry(rb1, av, &ai->volumes, rb)
543 ubi_rb_for_each_entry(rb2, aeb, &av->root, u.rb)
550 * ubi_attach_fastmap - creates ubi_attach_info from a fastmap.
551 * @ubi: UBI device object
552 * @ai: UBI attach info object
553 * @fm: the fastmap to be attached
555 * Returns 0 on success, UBI_BAD_FASTMAP if the found fastmap was unusable.
556 * < 0 indicates an internal error.
558 static int ubi_attach_fastmap(struct ubi_device *ubi,
559 struct ubi_attach_info *ai,
560 struct ubi_fastmap_layout *fm)
562 struct list_head used, free;
563 struct ubi_ainf_volume *av;
564 struct ubi_ainf_peb *aeb, *tmp_aeb, *_tmp_aeb;
565 struct ubi_fm_sb *fmsb;
566 struct ubi_fm_hdr *fmhdr;
567 struct ubi_fm_scan_pool *fmpl, *fmpl_wl;
568 struct ubi_fm_ec *fmec;
569 struct ubi_fm_volhdr *fmvhdr;
570 struct ubi_fm_eba *fm_eba;
571 int ret, i, j, pool_size, wl_pool_size;
572 size_t fm_pos = 0, fm_size = ubi->fm_size;
573 unsigned long long max_sqnum = 0;
574 void *fm_raw = ubi->fm_buf;
576 INIT_LIST_HEAD(&used);
577 INIT_LIST_HEAD(&free);
578 ai->min_ec = UBI_MAX_ERASECOUNTER;
580 fmsb = (struct ubi_fm_sb *)(fm_raw);
581 ai->max_sqnum = fmsb->sqnum;
582 fm_pos += sizeof(struct ubi_fm_sb);
583 if (fm_pos >= fm_size)
586 fmhdr = (struct ubi_fm_hdr *)(fm_raw + fm_pos);
587 fm_pos += sizeof(*fmhdr);
588 if (fm_pos >= fm_size)
591 if (be32_to_cpu(fmhdr->magic) != UBI_FM_HDR_MAGIC) {
592 ubi_err(ubi, "bad fastmap header magic: 0x%x, expected: 0x%x",
593 be32_to_cpu(fmhdr->magic), UBI_FM_HDR_MAGIC);
597 fmpl = (struct ubi_fm_scan_pool *)(fm_raw + fm_pos);
598 fm_pos += sizeof(*fmpl);
599 if (fm_pos >= fm_size)
601 if (be32_to_cpu(fmpl->magic) != UBI_FM_POOL_MAGIC) {
602 ubi_err(ubi, "bad fastmap pool magic: 0x%x, expected: 0x%x",
603 be32_to_cpu(fmpl->magic), UBI_FM_POOL_MAGIC);
607 fmpl_wl = (struct ubi_fm_scan_pool *)(fm_raw + fm_pos);
608 fm_pos += sizeof(*fmpl_wl);
609 if (fm_pos >= fm_size)
611 if (be32_to_cpu(fmpl_wl->magic) != UBI_FM_POOL_MAGIC) {
612 ubi_err(ubi, "bad fastmap WL pool magic: 0x%x, expected: 0x%x",
613 be32_to_cpu(fmpl_wl->magic), UBI_FM_POOL_MAGIC);
617 pool_size = be16_to_cpu(fmpl->size);
618 wl_pool_size = be16_to_cpu(fmpl_wl->size);
619 fm->max_pool_size = be16_to_cpu(fmpl->max_size);
620 fm->max_wl_pool_size = be16_to_cpu(fmpl_wl->max_size);
622 if (pool_size > UBI_FM_MAX_POOL_SIZE || pool_size < 0) {
623 ubi_err(ubi, "bad pool size: %i", pool_size);
627 if (wl_pool_size > UBI_FM_MAX_POOL_SIZE || wl_pool_size < 0) {
628 ubi_err(ubi, "bad WL pool size: %i", wl_pool_size);
633 if (fm->max_pool_size > UBI_FM_MAX_POOL_SIZE ||
634 fm->max_pool_size < 0) {
635 ubi_err(ubi, "bad maximal pool size: %i", fm->max_pool_size);
639 if (fm->max_wl_pool_size > UBI_FM_MAX_POOL_SIZE ||
640 fm->max_wl_pool_size < 0) {
641 ubi_err(ubi, "bad maximal WL pool size: %i",
642 fm->max_wl_pool_size);
646 /* read EC values from free list */
647 for (i = 0; i < be32_to_cpu(fmhdr->free_peb_count); i++) {
648 fmec = (struct ubi_fm_ec *)(fm_raw + fm_pos);
649 fm_pos += sizeof(*fmec);
650 if (fm_pos >= fm_size)
653 ret = add_aeb(ai, &ai->free, be32_to_cpu(fmec->pnum),
654 be32_to_cpu(fmec->ec), 0);
659 /* read EC values from used list */
660 for (i = 0; i < be32_to_cpu(fmhdr->used_peb_count); i++) {
661 fmec = (struct ubi_fm_ec *)(fm_raw + fm_pos);
662 fm_pos += sizeof(*fmec);
663 if (fm_pos >= fm_size)
666 ret = add_aeb(ai, &used, be32_to_cpu(fmec->pnum),
667 be32_to_cpu(fmec->ec), 0);
672 /* read EC values from scrub list */
673 for (i = 0; i < be32_to_cpu(fmhdr->scrub_peb_count); i++) {
674 fmec = (struct ubi_fm_ec *)(fm_raw + fm_pos);
675 fm_pos += sizeof(*fmec);
676 if (fm_pos >= fm_size)
679 ret = add_aeb(ai, &used, be32_to_cpu(fmec->pnum),
680 be32_to_cpu(fmec->ec), 1);
685 /* read EC values from erase list */
686 for (i = 0; i < be32_to_cpu(fmhdr->erase_peb_count); i++) {
687 fmec = (struct ubi_fm_ec *)(fm_raw + fm_pos);
688 fm_pos += sizeof(*fmec);
689 if (fm_pos >= fm_size)
692 ret = add_aeb(ai, &ai->erase, be32_to_cpu(fmec->pnum),
693 be32_to_cpu(fmec->ec), 1);
698 ai->mean_ec = div_u64(ai->ec_sum, ai->ec_count);
699 ai->bad_peb_count = be32_to_cpu(fmhdr->bad_peb_count);
701 /* Iterate over all volumes and read their EBA table */
702 for (i = 0; i < be32_to_cpu(fmhdr->vol_count); i++) {
703 fmvhdr = (struct ubi_fm_volhdr *)(fm_raw + fm_pos);
704 fm_pos += sizeof(*fmvhdr);
705 if (fm_pos >= fm_size)
708 if (be32_to_cpu(fmvhdr->magic) != UBI_FM_VHDR_MAGIC) {
709 ubi_err(ubi, "bad fastmap vol header magic: 0x%x, expected: 0x%x",
710 be32_to_cpu(fmvhdr->magic), UBI_FM_VHDR_MAGIC);
714 av = add_vol(ai, be32_to_cpu(fmvhdr->vol_id),
715 be32_to_cpu(fmvhdr->used_ebs),
716 be32_to_cpu(fmvhdr->data_pad),
718 be32_to_cpu(fmvhdr->last_eb_bytes));
721 if (PTR_ERR(av) == -EEXIST)
722 ubi_err(ubi, "volume (ID %i) already exists",
729 if (ai->highest_vol_id < be32_to_cpu(fmvhdr->vol_id))
730 ai->highest_vol_id = be32_to_cpu(fmvhdr->vol_id);
732 fm_eba = (struct ubi_fm_eba *)(fm_raw + fm_pos);
733 fm_pos += sizeof(*fm_eba);
734 fm_pos += (sizeof(__be32) * be32_to_cpu(fm_eba->reserved_pebs));
735 if (fm_pos >= fm_size)
738 if (be32_to_cpu(fm_eba->magic) != UBI_FM_EBA_MAGIC) {
739 ubi_err(ubi, "bad fastmap EBA header magic: 0x%x, expected: 0x%x",
740 be32_to_cpu(fm_eba->magic), UBI_FM_EBA_MAGIC);
744 for (j = 0; j < be32_to_cpu(fm_eba->reserved_pebs); j++) {
745 int pnum = be32_to_cpu(fm_eba->pnum[j]);
751 list_for_each_entry(tmp_aeb, &used, u.list) {
752 if (tmp_aeb->pnum == pnum) {
759 ubi_err(ubi, "PEB %i is in EBA but not in used list", pnum);
765 if (av->highest_lnum <= aeb->lnum)
766 av->highest_lnum = aeb->lnum;
768 assign_aeb_to_av(ai, aeb, av);
770 dbg_bld("inserting PEB:%i (LEB %i) to vol %i",
771 aeb->pnum, aeb->lnum, av->vol_id);
775 ret = scan_pool(ubi, ai, fmpl->pebs, pool_size, &max_sqnum, &free);
779 ret = scan_pool(ubi, ai, fmpl_wl->pebs, wl_pool_size, &max_sqnum, &free);
783 if (max_sqnum > ai->max_sqnum)
784 ai->max_sqnum = max_sqnum;
786 list_for_each_entry_safe(tmp_aeb, _tmp_aeb, &free, u.list)
787 list_move_tail(&tmp_aeb->u.list, &ai->free);
789 list_for_each_entry_safe(tmp_aeb, _tmp_aeb, &used, u.list)
790 list_move_tail(&tmp_aeb->u.list, &ai->erase);
792 ubi_assert(list_empty(&free));
795 * If fastmap is leaking PEBs (must not happen), raise a
796 * fat warning and fall back to scanning mode.
797 * We do this here because in ubi_wl_init() it's too late
798 * and we cannot fall back to scanning.
800 if (WARN_ON(count_fastmap_pebs(ai) != ubi->peb_count -
801 ai->bad_peb_count - fm->used_blocks))
807 ret = UBI_BAD_FASTMAP;
809 list_for_each_entry_safe(tmp_aeb, _tmp_aeb, &used, u.list) {
810 list_del(&tmp_aeb->u.list);
811 ubi_free_aeb(ai, tmp_aeb);
813 list_for_each_entry_safe(tmp_aeb, _tmp_aeb, &free, u.list) {
814 list_del(&tmp_aeb->u.list);
815 ubi_free_aeb(ai, tmp_aeb);
822 * find_fm_anchor - find the most recent Fastmap superblock (anchor)
823 * @ai: UBI attach info to be filled
825 static int find_fm_anchor(struct ubi_attach_info *ai)
828 struct ubi_ainf_peb *aeb;
829 unsigned long long max_sqnum = 0;
831 list_for_each_entry(aeb, &ai->fastmap, u.list) {
832 if (aeb->vol_id == UBI_FM_SB_VOLUME_ID && aeb->sqnum > max_sqnum) {
833 max_sqnum = aeb->sqnum;
841 static struct ubi_ainf_peb *clone_aeb(struct ubi_attach_info *ai,
842 struct ubi_ainf_peb *old)
844 struct ubi_ainf_peb *new;
846 new = ubi_alloc_aeb(ai, old->pnum, old->ec);
850 new->vol_id = old->vol_id;
851 new->sqnum = old->sqnum;
852 new->lnum = old->lnum;
853 new->scrub = old->scrub;
854 new->copy_flag = old->copy_flag;
860 * ubi_scan_fastmap - scan the fastmap.
861 * @ubi: UBI device object
862 * @ai: UBI attach info to be filled
863 * @scan_ai: UBI attach info from the first 64 PEBs,
864 * used to find the most recent Fastmap data structure
866 * Returns 0 on success, UBI_NO_FASTMAP if no fastmap was found,
867 * UBI_BAD_FASTMAP if one was found but is not usable.
868 * < 0 indicates an internal error.
870 int ubi_scan_fastmap(struct ubi_device *ubi, struct ubi_attach_info *ai,
871 struct ubi_attach_info *scan_ai)
873 struct ubi_fm_sb *fmsb, *fmsb2;
874 struct ubi_vid_io_buf *vb;
875 struct ubi_vid_hdr *vh;
876 struct ubi_ec_hdr *ech;
877 struct ubi_fastmap_layout *fm;
878 struct ubi_ainf_peb *aeb;
879 int i, used_blocks, pnum, fm_anchor, ret = 0;
882 unsigned long long sqnum = 0;
884 fm_anchor = find_fm_anchor(scan_ai);
886 return UBI_NO_FASTMAP;
888 /* Copy all (possible) fastmap blocks into our new attach structure. */
889 list_for_each_entry(aeb, &scan_ai->fastmap, u.list) {
890 struct ubi_ainf_peb *new;
892 new = clone_aeb(ai, aeb);
896 list_add(&new->u.list, &ai->fastmap);
899 down_write(&ubi->fm_protect);
900 memset(ubi->fm_buf, 0, ubi->fm_size);
902 fmsb = kmalloc(sizeof(*fmsb), GFP_KERNEL);
908 fm = kzalloc(sizeof(*fm), GFP_KERNEL);
915 ret = ubi_io_read_data(ubi, fmsb, fm_anchor, 0, sizeof(*fmsb));
916 if (ret && ret != UBI_IO_BITFLIPS)
918 else if (ret == UBI_IO_BITFLIPS)
919 fm->to_be_tortured[0] = 1;
921 if (be32_to_cpu(fmsb->magic) != UBI_FM_SB_MAGIC) {
922 ubi_err(ubi, "bad super block magic: 0x%x, expected: 0x%x",
923 be32_to_cpu(fmsb->magic), UBI_FM_SB_MAGIC);
924 ret = UBI_BAD_FASTMAP;
928 if (fmsb->version != UBI_FM_FMT_VERSION) {
929 ubi_err(ubi, "bad fastmap version: %i, expected: %i",
930 fmsb->version, UBI_FM_FMT_VERSION);
931 ret = UBI_BAD_FASTMAP;
935 used_blocks = be32_to_cpu(fmsb->used_blocks);
936 if (used_blocks > UBI_FM_MAX_BLOCKS || used_blocks < 1) {
937 ubi_err(ubi, "number of fastmap blocks is invalid: %i",
939 ret = UBI_BAD_FASTMAP;
943 fm_size = ubi->leb_size * used_blocks;
944 if (fm_size != ubi->fm_size) {
945 ubi_err(ubi, "bad fastmap size: %zi, expected: %zi",
946 fm_size, ubi->fm_size);
947 ret = UBI_BAD_FASTMAP;
951 ech = kzalloc(ubi->ec_hdr_alsize, GFP_KERNEL);
957 vb = ubi_alloc_vid_buf(ubi, GFP_KERNEL);
963 vh = ubi_get_vid_hdr(vb);
965 for (i = 0; i < used_blocks; i++) {
968 pnum = be32_to_cpu(fmsb->block_loc[i]);
970 if (ubi_io_is_bad(ubi, pnum)) {
971 ret = UBI_BAD_FASTMAP;
975 if (i == 0 && pnum != fm_anchor) {
976 ubi_err(ubi, "Fastmap anchor PEB mismatch: PEB: %i vs. %i",
978 ret = UBI_BAD_FASTMAP;
982 ret = ubi_io_read_ec_hdr(ubi, pnum, ech, 0);
983 if (ret && ret != UBI_IO_BITFLIPS) {
984 ubi_err(ubi, "unable to read fastmap block# %i EC (PEB: %i)",
987 ret = UBI_BAD_FASTMAP;
989 } else if (ret == UBI_IO_BITFLIPS)
990 fm->to_be_tortured[i] = 1;
992 image_seq = be32_to_cpu(ech->image_seq);
994 ubi->image_seq = image_seq;
997 * Older UBI implementations have image_seq set to zero, so
998 * we shouldn't fail if image_seq == 0.
1000 if (image_seq && (image_seq != ubi->image_seq)) {
1001 ubi_err(ubi, "wrong image seq:%d instead of %d",
1002 be32_to_cpu(ech->image_seq), ubi->image_seq);
1003 ret = UBI_BAD_FASTMAP;
1007 ret = ubi_io_read_vid_hdr(ubi, pnum, vb, 0);
1008 if (ret && ret != UBI_IO_BITFLIPS) {
1009 ubi_err(ubi, "unable to read fastmap block# %i (PEB: %i)",
1015 if (be32_to_cpu(vh->vol_id) != UBI_FM_SB_VOLUME_ID) {
1016 ubi_err(ubi, "bad fastmap anchor vol_id: 0x%x, expected: 0x%x",
1017 be32_to_cpu(vh->vol_id),
1018 UBI_FM_SB_VOLUME_ID);
1019 ret = UBI_BAD_FASTMAP;
1023 if (be32_to_cpu(vh->vol_id) != UBI_FM_DATA_VOLUME_ID) {
1024 ubi_err(ubi, "bad fastmap data vol_id: 0x%x, expected: 0x%x",
1025 be32_to_cpu(vh->vol_id),
1026 UBI_FM_DATA_VOLUME_ID);
1027 ret = UBI_BAD_FASTMAP;
1032 if (sqnum < be64_to_cpu(vh->sqnum))
1033 sqnum = be64_to_cpu(vh->sqnum);
1035 ret = ubi_io_read_data(ubi, ubi->fm_buf + (ubi->leb_size * i),
1036 pnum, 0, ubi->leb_size);
1037 if (ret && ret != UBI_IO_BITFLIPS) {
1038 ubi_err(ubi, "unable to read fastmap block# %i (PEB: %i, "
1039 "err: %i)", i, pnum, ret);
1047 fmsb2 = (struct ubi_fm_sb *)(ubi->fm_buf);
1048 tmp_crc = be32_to_cpu(fmsb2->data_crc);
1049 fmsb2->data_crc = 0;
1050 crc = crc32(UBI_CRC32_INIT, ubi->fm_buf, fm_size);
1051 if (crc != tmp_crc) {
1052 ubi_err(ubi, "fastmap data CRC is invalid");
1053 ubi_err(ubi, "CRC should be: 0x%x, calc: 0x%x",
1055 ret = UBI_BAD_FASTMAP;
1059 fmsb2->sqnum = sqnum;
1061 fm->used_blocks = used_blocks;
1063 ret = ubi_attach_fastmap(ubi, ai, fm);
1066 ret = UBI_BAD_FASTMAP;
1070 for (i = 0; i < used_blocks; i++) {
1071 struct ubi_wl_entry *e;
1073 e = kmem_cache_alloc(ubi_wl_entry_slab, GFP_KERNEL);
1082 e->pnum = be32_to_cpu(fmsb2->block_loc[i]);
1083 e->ec = be32_to_cpu(fmsb2->block_ec[i]);
1088 ubi->fm_pool.max_size = ubi->fm->max_pool_size;
1089 ubi->fm_wl_pool.max_size = ubi->fm->max_wl_pool_size;
1090 ubi_msg(ubi, "attached by fastmap");
1091 ubi_msg(ubi, "fastmap pool size: %d", ubi->fm_pool.max_size);
1092 ubi_msg(ubi, "fastmap WL pool size: %d",
1093 ubi->fm_wl_pool.max_size);
1094 ubi->fm_disabled = 0;
1095 ubi->fast_attach = 1;
1097 ubi_free_vid_buf(vb);
1100 up_write(&ubi->fm_protect);
1101 if (ret == UBI_BAD_FASTMAP)
1102 ubi_err(ubi, "Attach by fastmap failed, doing a full scan!");
1106 ubi_free_vid_buf(vb);
1114 int ubi_fastmap_init_checkmap(struct ubi_volume *vol, int leb_count)
1116 struct ubi_device *ubi = vol->ubi;
1118 if (!ubi->fast_attach)
1121 vol->checkmap = kcalloc(BITS_TO_LONGS(leb_count), sizeof(unsigned long),
1129 void ubi_fastmap_destroy_checkmap(struct ubi_volume *vol)
1131 kfree(vol->checkmap);
1135 * ubi_write_fastmap - writes a fastmap.
1136 * @ubi: UBI device object
1137 * @new_fm: the to be written fastmap
1139 * Returns 0 on success, < 0 indicates an internal error.
1141 static int ubi_write_fastmap(struct ubi_device *ubi,
1142 struct ubi_fastmap_layout *new_fm)
1146 struct ubi_fm_sb *fmsb;
1147 struct ubi_fm_hdr *fmh;
1148 struct ubi_fm_scan_pool *fmpl, *fmpl_wl;
1149 struct ubi_fm_ec *fec;
1150 struct ubi_fm_volhdr *fvh;
1151 struct ubi_fm_eba *feba;
1152 struct ubi_wl_entry *wl_e;
1153 struct ubi_volume *vol;
1154 struct ubi_vid_io_buf *avbuf, *dvbuf;
1155 struct ubi_vid_hdr *avhdr, *dvhdr;
1156 struct ubi_work *ubi_wrk;
1157 struct rb_node *tmp_rb;
1158 int ret, i, j, free_peb_count, used_peb_count, vol_count;
1159 int scrub_peb_count, erase_peb_count;
1160 unsigned long *seen_pebs;
1162 fm_raw = ubi->fm_buf;
1163 memset(ubi->fm_buf, 0, ubi->fm_size);
1165 avbuf = new_fm_vbuf(ubi, UBI_FM_SB_VOLUME_ID);
1171 dvbuf = new_fm_vbuf(ubi, UBI_FM_DATA_VOLUME_ID);
1174 goto out_free_avbuf;
1177 avhdr = ubi_get_vid_hdr(avbuf);
1178 dvhdr = ubi_get_vid_hdr(dvbuf);
1180 seen_pebs = init_seen(ubi);
1181 if (IS_ERR(seen_pebs)) {
1182 ret = PTR_ERR(seen_pebs);
1183 goto out_free_dvbuf;
1186 spin_lock(&ubi->volumes_lock);
1187 spin_lock(&ubi->wl_lock);
1189 fmsb = (struct ubi_fm_sb *)fm_raw;
1190 fm_pos += sizeof(*fmsb);
1191 ubi_assert(fm_pos <= ubi->fm_size);
1193 fmh = (struct ubi_fm_hdr *)(fm_raw + fm_pos);
1194 fm_pos += sizeof(*fmh);
1195 ubi_assert(fm_pos <= ubi->fm_size);
1197 fmsb->magic = cpu_to_be32(UBI_FM_SB_MAGIC);
1198 fmsb->version = UBI_FM_FMT_VERSION;
1199 fmsb->used_blocks = cpu_to_be32(new_fm->used_blocks);
1200 /* the max sqnum will be filled in while *reading* the fastmap */
1203 fmh->magic = cpu_to_be32(UBI_FM_HDR_MAGIC);
1206 scrub_peb_count = 0;
1207 erase_peb_count = 0;
1210 fmpl = (struct ubi_fm_scan_pool *)(fm_raw + fm_pos);
1211 fm_pos += sizeof(*fmpl);
1212 fmpl->magic = cpu_to_be32(UBI_FM_POOL_MAGIC);
1213 fmpl->size = cpu_to_be16(ubi->fm_pool.size);
1214 fmpl->max_size = cpu_to_be16(ubi->fm_pool.max_size);
1216 for (i = 0; i < ubi->fm_pool.size; i++) {
1217 fmpl->pebs[i] = cpu_to_be32(ubi->fm_pool.pebs[i]);
1218 set_seen(ubi, ubi->fm_pool.pebs[i], seen_pebs);
1221 fmpl_wl = (struct ubi_fm_scan_pool *)(fm_raw + fm_pos);
1222 fm_pos += sizeof(*fmpl_wl);
1223 fmpl_wl->magic = cpu_to_be32(UBI_FM_POOL_MAGIC);
1224 fmpl_wl->size = cpu_to_be16(ubi->fm_wl_pool.size);
1225 fmpl_wl->max_size = cpu_to_be16(ubi->fm_wl_pool.max_size);
1227 for (i = 0; i < ubi->fm_wl_pool.size; i++) {
1228 fmpl_wl->pebs[i] = cpu_to_be32(ubi->fm_wl_pool.pebs[i]);
1229 set_seen(ubi, ubi->fm_wl_pool.pebs[i], seen_pebs);
1232 ubi_for_each_free_peb(ubi, wl_e, tmp_rb) {
1233 fec = (struct ubi_fm_ec *)(fm_raw + fm_pos);
1235 fec->pnum = cpu_to_be32(wl_e->pnum);
1236 set_seen(ubi, wl_e->pnum, seen_pebs);
1237 fec->ec = cpu_to_be32(wl_e->ec);
1240 fm_pos += sizeof(*fec);
1241 ubi_assert(fm_pos <= ubi->fm_size);
1243 fmh->free_peb_count = cpu_to_be32(free_peb_count);
1245 ubi_for_each_used_peb(ubi, wl_e, tmp_rb) {
1246 fec = (struct ubi_fm_ec *)(fm_raw + fm_pos);
1248 fec->pnum = cpu_to_be32(wl_e->pnum);
1249 set_seen(ubi, wl_e->pnum, seen_pebs);
1250 fec->ec = cpu_to_be32(wl_e->ec);
1253 fm_pos += sizeof(*fec);
1254 ubi_assert(fm_pos <= ubi->fm_size);
1257 ubi_for_each_protected_peb(ubi, i, wl_e) {
1258 fec = (struct ubi_fm_ec *)(fm_raw + fm_pos);
1260 fec->pnum = cpu_to_be32(wl_e->pnum);
1261 set_seen(ubi, wl_e->pnum, seen_pebs);
1262 fec->ec = cpu_to_be32(wl_e->ec);
1265 fm_pos += sizeof(*fec);
1266 ubi_assert(fm_pos <= ubi->fm_size);
1268 fmh->used_peb_count = cpu_to_be32(used_peb_count);
1270 ubi_for_each_scrub_peb(ubi, wl_e, tmp_rb) {
1271 fec = (struct ubi_fm_ec *)(fm_raw + fm_pos);
1273 fec->pnum = cpu_to_be32(wl_e->pnum);
1274 set_seen(ubi, wl_e->pnum, seen_pebs);
1275 fec->ec = cpu_to_be32(wl_e->ec);
1278 fm_pos += sizeof(*fec);
1279 ubi_assert(fm_pos <= ubi->fm_size);
1281 fmh->scrub_peb_count = cpu_to_be32(scrub_peb_count);
1284 list_for_each_entry(ubi_wrk, &ubi->works, list) {
1285 if (ubi_is_erase_work(ubi_wrk)) {
1289 fec = (struct ubi_fm_ec *)(fm_raw + fm_pos);
1291 fec->pnum = cpu_to_be32(wl_e->pnum);
1292 set_seen(ubi, wl_e->pnum, seen_pebs);
1293 fec->ec = cpu_to_be32(wl_e->ec);
1296 fm_pos += sizeof(*fec);
1297 ubi_assert(fm_pos <= ubi->fm_size);
1300 fmh->erase_peb_count = cpu_to_be32(erase_peb_count);
1302 for (i = 0; i < UBI_MAX_VOLUMES + UBI_INT_VOL_COUNT; i++) {
1303 vol = ubi->volumes[i];
1310 fvh = (struct ubi_fm_volhdr *)(fm_raw + fm_pos);
1311 fm_pos += sizeof(*fvh);
1312 ubi_assert(fm_pos <= ubi->fm_size);
1314 fvh->magic = cpu_to_be32(UBI_FM_VHDR_MAGIC);
1315 fvh->vol_id = cpu_to_be32(vol->vol_id);
1316 fvh->vol_type = vol->vol_type;
1317 fvh->used_ebs = cpu_to_be32(vol->used_ebs);
1318 fvh->data_pad = cpu_to_be32(vol->data_pad);
1319 fvh->last_eb_bytes = cpu_to_be32(vol->last_eb_bytes);
1321 ubi_assert(vol->vol_type == UBI_DYNAMIC_VOLUME ||
1322 vol->vol_type == UBI_STATIC_VOLUME);
1324 feba = (struct ubi_fm_eba *)(fm_raw + fm_pos);
1325 fm_pos += sizeof(*feba) + (sizeof(__be32) * vol->reserved_pebs);
1326 ubi_assert(fm_pos <= ubi->fm_size);
1328 for (j = 0; j < vol->reserved_pebs; j++) {
1329 struct ubi_eba_leb_desc ldesc;
1331 ubi_eba_get_ldesc(vol, j, &ldesc);
1332 feba->pnum[j] = cpu_to_be32(ldesc.pnum);
1335 feba->reserved_pebs = cpu_to_be32(j);
1336 feba->magic = cpu_to_be32(UBI_FM_EBA_MAGIC);
1338 fmh->vol_count = cpu_to_be32(vol_count);
1339 fmh->bad_peb_count = cpu_to_be32(ubi->bad_peb_count);
1341 avhdr->sqnum = cpu_to_be64(ubi_next_sqnum(ubi));
1344 spin_unlock(&ubi->wl_lock);
1345 spin_unlock(&ubi->volumes_lock);
1347 dbg_bld("writing fastmap SB to PEB %i", new_fm->e[0]->pnum);
1348 ret = ubi_io_write_vid_hdr(ubi, new_fm->e[0]->pnum, avbuf);
1350 ubi_err(ubi, "unable to write vid_hdr to fastmap SB!");
1354 for (i = 0; i < new_fm->used_blocks; i++) {
1355 fmsb->block_loc[i] = cpu_to_be32(new_fm->e[i]->pnum);
1356 set_seen(ubi, new_fm->e[i]->pnum, seen_pebs);
1357 fmsb->block_ec[i] = cpu_to_be32(new_fm->e[i]->ec);
1361 fmsb->data_crc = cpu_to_be32(crc32(UBI_CRC32_INIT, fm_raw,
1364 for (i = 1; i < new_fm->used_blocks; i++) {
1365 dvhdr->sqnum = cpu_to_be64(ubi_next_sqnum(ubi));
1366 dvhdr->lnum = cpu_to_be32(i);
1367 dbg_bld("writing fastmap data to PEB %i sqnum %llu",
1368 new_fm->e[i]->pnum, be64_to_cpu(dvhdr->sqnum));
1369 ret = ubi_io_write_vid_hdr(ubi, new_fm->e[i]->pnum, dvbuf);
1371 ubi_err(ubi, "unable to write vid_hdr to PEB %i!",
1372 new_fm->e[i]->pnum);
1377 for (i = 0; i < new_fm->used_blocks; i++) {
1378 ret = ubi_io_write_data(ubi, fm_raw + (i * ubi->leb_size),
1379 new_fm->e[i]->pnum, 0, ubi->leb_size);
1381 ubi_err(ubi, "unable to write fastmap to PEB %i!",
1382 new_fm->e[i]->pnum);
1390 ret = self_check_seen(ubi, seen_pebs);
1391 dbg_bld("fastmap written!");
1394 free_seen(seen_pebs);
1396 ubi_free_vid_buf(dvbuf);
1398 ubi_free_vid_buf(avbuf);
1405 * erase_block - Manually erase a PEB.
1406 * @ubi: UBI device object
1407 * @pnum: PEB to be erased
1409 * Returns the new EC value on success, < 0 indicates an internal error.
1411 static int erase_block(struct ubi_device *ubi, int pnum)
1414 struct ubi_ec_hdr *ec_hdr;
1417 ec_hdr = kzalloc(ubi->ec_hdr_alsize, GFP_KERNEL);
1421 ret = ubi_io_read_ec_hdr(ubi, pnum, ec_hdr, 0);
1424 else if (ret && ret != UBI_IO_BITFLIPS) {
1429 ret = ubi_io_sync_erase(ubi, pnum, 0);
1433 ec = be64_to_cpu(ec_hdr->ec);
1435 if (ec > UBI_MAX_ERASECOUNTER) {
1440 ec_hdr->ec = cpu_to_be64(ec);
1441 ret = ubi_io_write_ec_hdr(ubi, pnum, ec_hdr);
1452 * invalidate_fastmap - destroys a fastmap.
1453 * @ubi: UBI device object
1455 * This function ensures that upon next UBI attach a full scan
1456 * is issued. We need this if UBI is about to write a new fastmap
1457 * but is unable to do so. In this case we have two options:
1458 * a) Make sure that the current fastmap will not be usued upon
1459 * attach time and contine or b) fall back to RO mode to have the
1460 * current fastmap in a valid state.
1461 * Returns 0 on success, < 0 indicates an internal error.
1463 static int invalidate_fastmap(struct ubi_device *ubi)
1466 struct ubi_fastmap_layout *fm;
1467 struct ubi_wl_entry *e;
1468 struct ubi_vid_io_buf *vb = NULL;
1469 struct ubi_vid_hdr *vh;
1477 fm = kzalloc(sizeof(*fm), GFP_KERNEL);
1481 vb = new_fm_vbuf(ubi, UBI_FM_SB_VOLUME_ID);
1485 vh = ubi_get_vid_hdr(vb);
1488 e = ubi_wl_get_fm_peb(ubi, 1);
1493 * Create fake fastmap such that UBI will fall back
1496 vh->sqnum = cpu_to_be64(ubi_next_sqnum(ubi));
1497 ret = ubi_io_write_vid_hdr(ubi, e->pnum, vb);
1499 ubi_wl_put_fm_peb(ubi, e, 0, 0);
1503 fm->used_blocks = 1;
1509 ubi_free_vid_buf(vb);
1518 * return_fm_pebs - returns all PEBs used by a fastmap back to the
1520 * @ubi: UBI device object
1521 * @fm: fastmap layout object
1523 static void return_fm_pebs(struct ubi_device *ubi,
1524 struct ubi_fastmap_layout *fm)
1531 for (i = 0; i < fm->used_blocks; i++) {
1533 ubi_wl_put_fm_peb(ubi, fm->e[i], i,
1534 fm->to_be_tortured[i]);
1541 * ubi_update_fastmap - will be called by UBI if a volume changes or
1542 * a fastmap pool becomes full.
1543 * @ubi: UBI device object
1545 * Returns 0 on success, < 0 indicates an internal error.
1547 int ubi_update_fastmap(struct ubi_device *ubi)
1550 struct ubi_fastmap_layout *new_fm, *old_fm;
1551 struct ubi_wl_entry *tmp_e;
1553 down_write(&ubi->fm_protect);
1554 down_write(&ubi->work_sem);
1555 down_write(&ubi->fm_eba_sem);
1557 ubi_refill_pools(ubi);
1559 if (ubi->ro_mode || ubi->fm_disabled) {
1560 up_write(&ubi->fm_eba_sem);
1561 up_write(&ubi->work_sem);
1562 up_write(&ubi->fm_protect);
1566 ret = ubi_ensure_anchor_pebs(ubi);
1568 up_write(&ubi->fm_eba_sem);
1569 up_write(&ubi->work_sem);
1570 up_write(&ubi->fm_protect);
1574 new_fm = kzalloc(sizeof(*new_fm), GFP_KERNEL);
1576 up_write(&ubi->fm_eba_sem);
1577 up_write(&ubi->work_sem);
1578 up_write(&ubi->fm_protect);
1582 new_fm->used_blocks = ubi->fm_size / ubi->leb_size;
1586 if (new_fm->used_blocks > UBI_FM_MAX_BLOCKS) {
1587 ubi_err(ubi, "fastmap too large");
1592 for (i = 1; i < new_fm->used_blocks; i++) {
1593 spin_lock(&ubi->wl_lock);
1594 tmp_e = ubi_wl_get_fm_peb(ubi, 0);
1595 spin_unlock(&ubi->wl_lock);
1598 if (old_fm && old_fm->e[i]) {
1599 ret = erase_block(ubi, old_fm->e[i]->pnum);
1601 ubi_err(ubi, "could not erase old fastmap PEB");
1603 for (j = 1; j < i; j++) {
1604 ubi_wl_put_fm_peb(ubi, new_fm->e[j],
1606 new_fm->e[j] = NULL;
1610 new_fm->e[i] = old_fm->e[i];
1611 old_fm->e[i] = NULL;
1613 ubi_err(ubi, "could not get any free erase block");
1615 for (j = 1; j < i; j++) {
1616 ubi_wl_put_fm_peb(ubi, new_fm->e[j], j, 0);
1617 new_fm->e[j] = NULL;
1624 new_fm->e[i] = tmp_e;
1626 if (old_fm && old_fm->e[i]) {
1627 ubi_wl_put_fm_peb(ubi, old_fm->e[i], i,
1628 old_fm->to_be_tortured[i]);
1629 old_fm->e[i] = NULL;
1634 /* Old fastmap is larger than the new one */
1635 if (old_fm && new_fm->used_blocks < old_fm->used_blocks) {
1636 for (i = new_fm->used_blocks; i < old_fm->used_blocks; i++) {
1637 ubi_wl_put_fm_peb(ubi, old_fm->e[i], i,
1638 old_fm->to_be_tortured[i]);
1639 old_fm->e[i] = NULL;
1643 spin_lock(&ubi->wl_lock);
1644 tmp_e = ubi_wl_get_fm_peb(ubi, 1);
1645 spin_unlock(&ubi->wl_lock);
1648 /* no fresh anchor PEB was found, reuse the old one */
1650 ret = erase_block(ubi, old_fm->e[0]->pnum);
1652 ubi_err(ubi, "could not erase old anchor PEB");
1654 for (i = 1; i < new_fm->used_blocks; i++) {
1655 ubi_wl_put_fm_peb(ubi, new_fm->e[i],
1657 new_fm->e[i] = NULL;
1661 new_fm->e[0] = old_fm->e[0];
1662 new_fm->e[0]->ec = ret;
1663 old_fm->e[0] = NULL;
1665 /* we've got a new anchor PEB, return the old one */
1666 ubi_wl_put_fm_peb(ubi, old_fm->e[0], 0,
1667 old_fm->to_be_tortured[0]);
1668 new_fm->e[0] = tmp_e;
1669 old_fm->e[0] = NULL;
1673 ubi_err(ubi, "could not find any anchor PEB");
1675 for (i = 1; i < new_fm->used_blocks; i++) {
1676 ubi_wl_put_fm_peb(ubi, new_fm->e[i], i, 0);
1677 new_fm->e[i] = NULL;
1683 new_fm->e[0] = tmp_e;
1686 ret = ubi_write_fastmap(ubi, new_fm);
1692 up_write(&ubi->fm_eba_sem);
1693 up_write(&ubi->work_sem);
1694 up_write(&ubi->fm_protect);
1699 ubi_warn(ubi, "Unable to write new fastmap, err=%i", ret);
1701 ret = invalidate_fastmap(ubi);
1703 ubi_err(ubi, "Unable to invalidate current fastmap!");
1706 return_fm_pebs(ubi, old_fm);
1707 return_fm_pebs(ubi, new_fm);