2 * Copyright (c) International Business Machines Corp., 2006
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
12 * the GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 * Author: Artem Bityutskiy (Битюцкий Артём)
22 * The UBI Eraseblock Association (EBA) sub-system.
24 * This sub-system is responsible for I/O to/from logical eraseblock.
26 * Although in this implementation the EBA table is fully kept and managed in
27 * RAM, which assumes poor scalability, it might be (partially) maintained on
28 * flash in future implementations.
30 * The EBA sub-system implements per-logical eraseblock locking. Before
31 * accessing a logical eraseblock it is locked for reading or writing. The
32 * per-logical eraseblock locking is implemented by means of the lock tree. The
33 * lock tree is an RB-tree which refers all the currently locked logical
34 * eraseblocks. The lock tree elements are &struct ubi_ltree_entry objects.
35 * They are indexed by (@vol_id, @lnum) pairs.
37 * EBA also maintains the global sequence counter which is incremented each
38 * time a logical eraseblock is mapped to a physical eraseblock and it is
39 * stored in the volume identifier header. This means that each VID header has
40 * a unique sequence number. The sequence number is only increased an we assume
41 * 64 bits is enough to never overflow.
44 #include <linux/slab.h>
45 #include <linux/crc32.h>
46 #include <linux/err.h>
49 /* Number of physical eraseblocks reserved for atomic LEB change operation */
50 #define EBA_RESERVED_PEBS 1
53 * struct ubi_eba_entry - structure encoding a single LEB -> PEB association
54 * @pnum: the physical eraseblock number attached to the LEB
56 * This structure is encoding a LEB -> PEB association. Note that the LEB
57 * number is not stored here, because it is the index used to access the
60 struct ubi_eba_entry {
65 * struct ubi_eba_table - LEB -> PEB association information
66 * @entries: the LEB to PEB mapping (one entry per LEB).
68 * This structure is private to the EBA logic and should be kept here.
69 * It is encoding the LEB to PEB association table, and is subject to
72 struct ubi_eba_table {
73 struct ubi_eba_entry *entries;
77 * next_sqnum - get next sequence number.
78 * @ubi: UBI device description object
80 * This function returns next sequence number to use, which is just the current
81 * global sequence counter value. It also increases the global sequence
84 unsigned long long ubi_next_sqnum(struct ubi_device *ubi)
86 unsigned long long sqnum;
88 spin_lock(&ubi->ltree_lock);
89 sqnum = ubi->global_sqnum++;
90 spin_unlock(&ubi->ltree_lock);
96 * ubi_get_compat - get compatibility flags of a volume.
97 * @ubi: UBI device description object
100 * This function returns compatibility flags for an internal volume. User
101 * volumes have no compatibility flags, so %0 is returned.
103 static int ubi_get_compat(const struct ubi_device *ubi, int vol_id)
105 if (vol_id == UBI_LAYOUT_VOLUME_ID)
106 return UBI_LAYOUT_VOLUME_COMPAT;
111 * ubi_eba_get_ldesc - get information about a LEB
112 * @vol: volume description object
113 * @lnum: logical eraseblock number
114 * @ldesc: the LEB descriptor to fill
116 * Used to query information about a specific LEB.
117 * It is currently only returning the physical position of the LEB, but will be
118 * extended to provide more information.
120 void ubi_eba_get_ldesc(struct ubi_volume *vol, int lnum,
121 struct ubi_eba_leb_desc *ldesc)
124 ldesc->pnum = vol->eba_tbl->entries[lnum].pnum;
128 * ubi_eba_create_table - allocate a new EBA table and initialize it with all
130 * @vol: volume containing the EBA table to copy
131 * @nentries: number of entries in the table
133 * Allocate a new EBA table and initialize it with all LEBs unmapped.
134 * Returns a valid pointer if it succeed, an ERR_PTR() otherwise.
136 struct ubi_eba_table *ubi_eba_create_table(struct ubi_volume *vol,
139 struct ubi_eba_table *tbl;
143 tbl = kzalloc(sizeof(*tbl), GFP_KERNEL);
145 return ERR_PTR(-ENOMEM);
147 tbl->entries = kmalloc_array(nentries, sizeof(*tbl->entries),
152 for (i = 0; i < nentries; i++)
153 tbl->entries[i].pnum = UBI_LEB_UNMAPPED;
165 * ubi_eba_destroy_table - destroy an EBA table
166 * @tbl: the table to destroy
168 * Destroy an EBA table.
170 void ubi_eba_destroy_table(struct ubi_eba_table *tbl)
180 * ubi_eba_copy_table - copy the EBA table attached to vol into another table
181 * @vol: volume containing the EBA table to copy
183 * @nentries: number of entries to copy
185 * Copy the EBA table stored in vol into the one pointed by dst.
187 void ubi_eba_copy_table(struct ubi_volume *vol, struct ubi_eba_table *dst,
190 struct ubi_eba_table *src;
193 ubi_assert(dst && vol && vol->eba_tbl);
197 for (i = 0; i < nentries; i++)
198 dst->entries[i].pnum = src->entries[i].pnum;
202 * ubi_eba_replace_table - assign a new EBA table to a volume
203 * @vol: volume containing the EBA table to copy
204 * @tbl: new EBA table
206 * Assign a new EBA table to the volume and release the old one.
208 void ubi_eba_replace_table(struct ubi_volume *vol, struct ubi_eba_table *tbl)
210 ubi_eba_destroy_table(vol->eba_tbl);
215 * ltree_lookup - look up the lock tree.
216 * @ubi: UBI device description object
218 * @lnum: logical eraseblock number
220 * This function returns a pointer to the corresponding &struct ubi_ltree_entry
221 * object if the logical eraseblock is locked and %NULL if it is not.
222 * @ubi->ltree_lock has to be locked.
224 static struct ubi_ltree_entry *ltree_lookup(struct ubi_device *ubi, int vol_id,
229 p = ubi->ltree.rb_node;
231 struct ubi_ltree_entry *le;
233 le = rb_entry(p, struct ubi_ltree_entry, rb);
235 if (vol_id < le->vol_id)
237 else if (vol_id > le->vol_id)
242 else if (lnum > le->lnum)
253 * ltree_add_entry - add new entry to the lock tree.
254 * @ubi: UBI device description object
256 * @lnum: logical eraseblock number
258 * This function adds new entry for logical eraseblock (@vol_id, @lnum) to the
259 * lock tree. If such entry is already there, its usage counter is increased.
260 * Returns pointer to the lock tree entry or %-ENOMEM if memory allocation
263 static struct ubi_ltree_entry *ltree_add_entry(struct ubi_device *ubi,
264 int vol_id, int lnum)
266 struct ubi_ltree_entry *le, *le1, *le_free;
268 le = kmalloc(sizeof(struct ubi_ltree_entry), GFP_NOFS);
270 return ERR_PTR(-ENOMEM);
273 init_rwsem(&le->mutex);
277 spin_lock(&ubi->ltree_lock);
278 le1 = ltree_lookup(ubi, vol_id, lnum);
282 * This logical eraseblock is already locked. The newly
283 * allocated lock entry is not needed.
288 struct rb_node **p, *parent = NULL;
291 * No lock entry, add the newly allocated one to the
292 * @ubi->ltree RB-tree.
296 p = &ubi->ltree.rb_node;
299 le1 = rb_entry(parent, struct ubi_ltree_entry, rb);
301 if (vol_id < le1->vol_id)
303 else if (vol_id > le1->vol_id)
306 ubi_assert(lnum != le1->lnum);
307 if (lnum < le1->lnum)
314 rb_link_node(&le->rb, parent, p);
315 rb_insert_color(&le->rb, &ubi->ltree);
318 spin_unlock(&ubi->ltree_lock);
325 * leb_read_lock - lock logical eraseblock for reading.
326 * @ubi: UBI device description object
328 * @lnum: logical eraseblock number
330 * This function locks a logical eraseblock for reading. Returns zero in case
331 * of success and a negative error code in case of failure.
333 static int leb_read_lock(struct ubi_device *ubi, int vol_id, int lnum)
335 struct ubi_ltree_entry *le;
337 le = ltree_add_entry(ubi, vol_id, lnum);
340 down_read(&le->mutex);
345 * leb_read_unlock - unlock logical eraseblock.
346 * @ubi: UBI device description object
348 * @lnum: logical eraseblock number
350 static void leb_read_unlock(struct ubi_device *ubi, int vol_id, int lnum)
352 struct ubi_ltree_entry *le;
354 spin_lock(&ubi->ltree_lock);
355 le = ltree_lookup(ubi, vol_id, lnum);
357 ubi_assert(le->users >= 0);
359 if (le->users == 0) {
360 rb_erase(&le->rb, &ubi->ltree);
363 spin_unlock(&ubi->ltree_lock);
367 * leb_write_lock - lock logical eraseblock for writing.
368 * @ubi: UBI device description object
370 * @lnum: logical eraseblock number
372 * This function locks a logical eraseblock for writing. Returns zero in case
373 * of success and a negative error code in case of failure.
375 static int leb_write_lock(struct ubi_device *ubi, int vol_id, int lnum)
377 struct ubi_ltree_entry *le;
379 le = ltree_add_entry(ubi, vol_id, lnum);
382 down_write(&le->mutex);
387 * leb_write_trylock - try to lock logical eraseblock for writing.
388 * @ubi: UBI device description object
390 * @lnum: logical eraseblock number
392 * This function locks a logical eraseblock for writing if there is no
393 * contention and does nothing if there is contention. Returns %0 in case of
394 * success, %1 in case of contention, and and a negative error code in case of
397 static int leb_write_trylock(struct ubi_device *ubi, int vol_id, int lnum)
399 struct ubi_ltree_entry *le;
401 le = ltree_add_entry(ubi, vol_id, lnum);
404 if (down_write_trylock(&le->mutex))
407 /* Contention, cancel */
408 spin_lock(&ubi->ltree_lock);
410 ubi_assert(le->users >= 0);
411 if (le->users == 0) {
412 rb_erase(&le->rb, &ubi->ltree);
415 spin_unlock(&ubi->ltree_lock);
421 * leb_write_unlock - unlock logical eraseblock.
422 * @ubi: UBI device description object
424 * @lnum: logical eraseblock number
426 static void leb_write_unlock(struct ubi_device *ubi, int vol_id, int lnum)
428 struct ubi_ltree_entry *le;
430 spin_lock(&ubi->ltree_lock);
431 le = ltree_lookup(ubi, vol_id, lnum);
433 ubi_assert(le->users >= 0);
434 up_write(&le->mutex);
435 if (le->users == 0) {
436 rb_erase(&le->rb, &ubi->ltree);
439 spin_unlock(&ubi->ltree_lock);
443 * ubi_eba_is_mapped - check if a LEB is mapped.
444 * @vol: volume description object
445 * @lnum: logical eraseblock number
447 * This function returns true if the LEB is mapped, false otherwise.
449 bool ubi_eba_is_mapped(struct ubi_volume *vol, int lnum)
451 return vol->eba_tbl->entries[lnum].pnum >= 0;
455 * ubi_eba_unmap_leb - un-map logical eraseblock.
456 * @ubi: UBI device description object
457 * @vol: volume description object
458 * @lnum: logical eraseblock number
460 * This function un-maps logical eraseblock @lnum and schedules corresponding
461 * physical eraseblock for erasure. Returns zero in case of success and a
462 * negative error code in case of failure.
464 int ubi_eba_unmap_leb(struct ubi_device *ubi, struct ubi_volume *vol,
467 int err, pnum, vol_id = vol->vol_id;
472 err = leb_write_lock(ubi, vol_id, lnum);
476 pnum = vol->eba_tbl->entries[lnum].pnum;
478 /* This logical eraseblock is already unmapped */
481 dbg_eba("erase LEB %d:%d, PEB %d", vol_id, lnum, pnum);
483 down_read(&ubi->fm_eba_sem);
484 vol->eba_tbl->entries[lnum].pnum = UBI_LEB_UNMAPPED;
485 up_read(&ubi->fm_eba_sem);
486 err = ubi_wl_put_peb(ubi, vol_id, lnum, pnum, 0);
489 leb_write_unlock(ubi, vol_id, lnum);
493 #ifdef CONFIG_MTD_UBI_FASTMAP
495 * check_mapping - check and fixup a mapping
496 * @ubi: UBI device description object
497 * @vol: volume description object
498 * @lnum: logical eraseblock number
499 * @pnum: physical eraseblock number
501 * Checks whether a given mapping is valid. Fastmap cannot track LEB unmap
502 * operations, if such an operation is interrupted the mapping still looks
503 * good, but upon first read an ECC is reported to the upper layer.
504 * Normaly during the full-scan at attach time this is fixed, for Fastmap
505 * we have to deal with it while reading.
506 * If the PEB behind a LEB shows this symthom we change the mapping to
507 * %UBI_LEB_UNMAPPED and schedule the PEB for erasure.
509 * Returns 0 on success, negative error code in case of failure.
511 static int check_mapping(struct ubi_device *ubi, struct ubi_volume *vol, int lnum,
515 struct ubi_vid_io_buf *vidb;
516 struct ubi_vid_hdr *vid_hdr;
518 if (!ubi->fast_attach)
521 if (!vol->checkmap || test_bit(lnum, vol->checkmap))
524 vidb = ubi_alloc_vid_buf(ubi, GFP_NOFS);
528 err = ubi_io_read_vid_hdr(ubi, *pnum, vidb, 0);
529 if (err > 0 && err != UBI_IO_BITFLIPS) {
534 case UBI_IO_FF_BITFLIPS:
536 case UBI_IO_BAD_HDR_EBADMSG:
542 if (err == UBI_IO_BAD_HDR_EBADMSG || err == UBI_IO_FF_BITFLIPS)
545 down_read(&ubi->fm_eba_sem);
546 vol->eba_tbl->entries[lnum].pnum = UBI_LEB_UNMAPPED;
547 up_read(&ubi->fm_eba_sem);
548 ubi_wl_put_peb(ubi, vol->vol_id, lnum, *pnum, torture);
550 *pnum = UBI_LEB_UNMAPPED;
551 } else if (err < 0) {
552 ubi_err(ubi, "unable to read VID header back from PEB %i: %i",
557 int found_vol_id, found_lnum;
559 ubi_assert(err == 0 || err == UBI_IO_BITFLIPS);
561 vid_hdr = ubi_get_vid_hdr(vidb);
562 found_vol_id = be32_to_cpu(vid_hdr->vol_id);
563 found_lnum = be32_to_cpu(vid_hdr->lnum);
565 if (found_lnum != lnum || found_vol_id != vol->vol_id) {
566 ubi_err(ubi, "EBA mismatch! PEB %i is LEB %i:%i instead of LEB %i:%i",
567 *pnum, found_vol_id, found_lnum, vol->vol_id, lnum);
574 set_bit(lnum, vol->checkmap);
578 ubi_free_vid_buf(vidb);
583 static int check_mapping(struct ubi_device *ubi, struct ubi_volume *vol, int lnum,
591 * ubi_eba_read_leb - read data.
592 * @ubi: UBI device description object
593 * @vol: volume description object
594 * @lnum: logical eraseblock number
595 * @buf: buffer to store the read data
596 * @offset: offset from where to read
597 * @len: how many bytes to read
598 * @check: data CRC check flag
600 * If the logical eraseblock @lnum is unmapped, @buf is filled with 0xFF
601 * bytes. The @check flag only makes sense for static volumes and forces
602 * eraseblock data CRC checking.
604 * In case of success this function returns zero. In case of a static volume,
605 * if data CRC mismatches - %-EBADMSG is returned. %-EBADMSG may also be
606 * returned for any volume type if an ECC error was detected by the MTD device
607 * driver. Other negative error cored may be returned in case of other errors.
609 int ubi_eba_read_leb(struct ubi_device *ubi, struct ubi_volume *vol, int lnum,
610 void *buf, int offset, int len, int check)
612 int err, pnum, scrub = 0, vol_id = vol->vol_id;
613 struct ubi_vid_io_buf *vidb;
614 struct ubi_vid_hdr *vid_hdr;
617 err = leb_read_lock(ubi, vol_id, lnum);
621 pnum = vol->eba_tbl->entries[lnum].pnum;
623 err = check_mapping(ubi, vol, lnum, &pnum);
628 if (pnum == UBI_LEB_UNMAPPED) {
630 * The logical eraseblock is not mapped, fill the whole buffer
631 * with 0xFF bytes. The exception is static volumes for which
632 * it is an error to read unmapped logical eraseblocks.
634 dbg_eba("read %d bytes from offset %d of LEB %d:%d (unmapped)",
635 len, offset, vol_id, lnum);
636 leb_read_unlock(ubi, vol_id, lnum);
637 ubi_assert(vol->vol_type != UBI_STATIC_VOLUME);
638 memset(buf, 0xFF, len);
642 dbg_eba("read %d bytes from offset %d of LEB %d:%d, PEB %d",
643 len, offset, vol_id, lnum, pnum);
645 if (vol->vol_type == UBI_DYNAMIC_VOLUME)
650 vidb = ubi_alloc_vid_buf(ubi, GFP_NOFS);
656 vid_hdr = ubi_get_vid_hdr(vidb);
658 err = ubi_io_read_vid_hdr(ubi, pnum, vidb, 1);
659 if (err && err != UBI_IO_BITFLIPS) {
662 * The header is either absent or corrupted.
663 * The former case means there is a bug -
664 * switch to read-only mode just in case.
665 * The latter case means a real corruption - we
666 * may try to recover data. FIXME: but this is
669 if (err == UBI_IO_BAD_HDR_EBADMSG ||
670 err == UBI_IO_BAD_HDR) {
671 ubi_warn(ubi, "corrupted VID header at PEB %d, LEB %d:%d",
676 * Ending up here in the non-Fastmap case
677 * is a clear bug as the VID header had to
678 * be present at scan time to have it referenced.
679 * With fastmap the story is more complicated.
680 * Fastmap has the mapping info without the need
681 * of a full scan. So the LEB could have been
682 * unmapped, Fastmap cannot know this and keeps
683 * the LEB referenced.
684 * This is valid and works as the layer above UBI
685 * has to do bookkeeping about used/referenced
688 if (ubi->fast_attach) {
697 } else if (err == UBI_IO_BITFLIPS)
700 ubi_assert(lnum < be32_to_cpu(vid_hdr->used_ebs));
701 ubi_assert(len == be32_to_cpu(vid_hdr->data_size));
703 crc = be32_to_cpu(vid_hdr->data_crc);
704 ubi_free_vid_buf(vidb);
707 err = ubi_io_read_data(ubi, buf, pnum, offset, len);
709 if (err == UBI_IO_BITFLIPS)
711 else if (mtd_is_eccerr(err)) {
712 if (vol->vol_type == UBI_DYNAMIC_VOLUME)
716 ubi_msg(ubi, "force data checking");
725 uint32_t crc1 = crc32(UBI_CRC32_INIT, buf, len);
727 ubi_warn(ubi, "CRC error: calculated %#08x, must be %#08x",
735 err = ubi_wl_scrub_peb(ubi, pnum);
737 leb_read_unlock(ubi, vol_id, lnum);
741 ubi_free_vid_buf(vidb);
743 leb_read_unlock(ubi, vol_id, lnum);
748 * ubi_eba_read_leb_sg - read data into a scatter gather list.
749 * @ubi: UBI device description object
750 * @vol: volume description object
751 * @lnum: logical eraseblock number
752 * @sgl: UBI scatter gather list to store the read data
753 * @offset: offset from where to read
754 * @len: how many bytes to read
755 * @check: data CRC check flag
757 * This function works exactly like ubi_eba_read_leb(). But instead of
758 * storing the read data into a buffer it writes to an UBI scatter gather
761 int ubi_eba_read_leb_sg(struct ubi_device *ubi, struct ubi_volume *vol,
762 struct ubi_sgl *sgl, int lnum, int offset, int len,
767 struct scatterlist *sg;
770 ubi_assert(sgl->list_pos < UBI_MAX_SG_COUNT);
771 sg = &sgl->sg[sgl->list_pos];
772 if (len < sg->length - sgl->page_pos)
775 to_read = sg->length - sgl->page_pos;
777 ret = ubi_eba_read_leb(ubi, vol, lnum,
778 sg_virt(sg) + sgl->page_pos, offset,
786 sgl->page_pos += to_read;
787 if (sgl->page_pos == sg->length) {
803 * try_recover_peb - try to recover from write failure.
804 * @vol: volume description object
805 * @pnum: the physical eraseblock to recover
806 * @lnum: logical eraseblock number
807 * @buf: data which was not written because of the write failure
808 * @offset: offset of the failed write
809 * @len: how many bytes should have been written
811 * @retry: whether the caller should retry in case of failure
813 * This function is called in case of a write failure and moves all good data
814 * from the potentially bad physical eraseblock to a good physical eraseblock.
815 * This function also writes the data which was not written due to the failure.
816 * Returns 0 in case of success, and a negative error code in case of failure.
817 * In case of failure, the %retry parameter is set to false if this is a fatal
818 * error (retrying won't help), and true otherwise.
820 static int try_recover_peb(struct ubi_volume *vol, int pnum, int lnum,
821 const void *buf, int offset, int len,
822 struct ubi_vid_io_buf *vidb, bool *retry)
824 struct ubi_device *ubi = vol->ubi;
825 struct ubi_vid_hdr *vid_hdr;
826 int new_pnum, err, vol_id = vol->vol_id, data_size;
831 new_pnum = ubi_wl_get_peb(ubi);
837 ubi_msg(ubi, "recover PEB %d, move data to PEB %d",
840 err = ubi_io_read_vid_hdr(ubi, pnum, vidb, 1);
841 if (err && err != UBI_IO_BITFLIPS) {
847 vid_hdr = ubi_get_vid_hdr(vidb);
848 ubi_assert(vid_hdr->vol_type == UBI_VID_DYNAMIC);
850 mutex_lock(&ubi->buf_mutex);
851 memset(ubi->peb_buf + offset, 0xFF, len);
853 /* Read everything before the area where the write failure happened */
855 err = ubi_io_read_data(ubi, ubi->peb_buf, pnum, 0, offset);
856 if (err && err != UBI_IO_BITFLIPS)
862 memcpy(ubi->peb_buf + offset, buf, len);
864 data_size = offset + len;
865 crc = crc32(UBI_CRC32_INIT, ubi->peb_buf, data_size);
866 vid_hdr->sqnum = cpu_to_be64(ubi_next_sqnum(ubi));
867 vid_hdr->copy_flag = 1;
868 vid_hdr->data_size = cpu_to_be32(data_size);
869 vid_hdr->data_crc = cpu_to_be32(crc);
870 err = ubi_io_write_vid_hdr(ubi, new_pnum, vidb);
874 err = ubi_io_write_data(ubi, ubi->peb_buf, new_pnum, 0, data_size);
877 mutex_unlock(&ubi->buf_mutex);
880 vol->eba_tbl->entries[lnum].pnum = new_pnum;
883 up_read(&ubi->fm_eba_sem);
886 ubi_wl_put_peb(ubi, vol_id, lnum, pnum, 1);
887 ubi_msg(ubi, "data was successfully recovered");
888 } else if (new_pnum >= 0) {
890 * Bad luck? This physical eraseblock is bad too? Crud. Let's
891 * try to get another one.
893 ubi_wl_put_peb(ubi, vol_id, lnum, new_pnum, 1);
894 ubi_warn(ubi, "failed to write to PEB %d", new_pnum);
901 * recover_peb - recover from write failure.
902 * @ubi: UBI device description object
903 * @pnum: the physical eraseblock to recover
905 * @lnum: logical eraseblock number
906 * @buf: data which was not written because of the write failure
907 * @offset: offset of the failed write
908 * @len: how many bytes should have been written
910 * This function is called in case of a write failure and moves all good data
911 * from the potentially bad physical eraseblock to a good physical eraseblock.
912 * This function also writes the data which was not written due to the failure.
913 * Returns 0 in case of success, and a negative error code in case of failure.
914 * This function tries %UBI_IO_RETRIES before giving up.
916 static int recover_peb(struct ubi_device *ubi, int pnum, int vol_id, int lnum,
917 const void *buf, int offset, int len)
919 int err, idx = vol_id2idx(ubi, vol_id), tries;
920 struct ubi_volume *vol = ubi->volumes[idx];
921 struct ubi_vid_io_buf *vidb;
923 vidb = ubi_alloc_vid_buf(ubi, GFP_NOFS);
927 for (tries = 0; tries <= UBI_IO_RETRIES; tries++) {
930 err = try_recover_peb(vol, pnum, lnum, buf, offset, len, vidb,
935 ubi_msg(ubi, "try again");
938 ubi_free_vid_buf(vidb);
944 * try_write_vid_and_data - try to write VID header and data to a new PEB.
945 * @vol: volume description object
946 * @lnum: logical eraseblock number
947 * @vidb: the VID buffer to write
948 * @buf: buffer containing the data
949 * @offset: where to start writing data
950 * @len: how many bytes should be written
952 * This function tries to write VID header and data belonging to logical
953 * eraseblock @lnum of volume @vol to a new physical eraseblock. Returns zero
954 * in case of success and a negative error code in case of failure.
955 * In case of error, it is possible that something was still written to the
956 * flash media, but may be some garbage.
958 static int try_write_vid_and_data(struct ubi_volume *vol, int lnum,
959 struct ubi_vid_io_buf *vidb, const void *buf,
962 struct ubi_device *ubi = vol->ubi;
963 int pnum, opnum, err, err2, vol_id = vol->vol_id;
965 pnum = ubi_wl_get_peb(ubi);
971 opnum = vol->eba_tbl->entries[lnum].pnum;
973 dbg_eba("write VID hdr and %d bytes at offset %d of LEB %d:%d, PEB %d",
974 len, offset, vol_id, lnum, pnum);
976 err = ubi_io_write_vid_hdr(ubi, pnum, vidb);
978 ubi_warn(ubi, "failed to write VID header to LEB %d:%d, PEB %d",
984 err = ubi_io_write_data(ubi, buf, pnum, offset, len);
987 "failed to write %d bytes at offset %d of LEB %d:%d, PEB %d",
988 len, offset, vol_id, lnum, pnum);
993 vol->eba_tbl->entries[lnum].pnum = pnum;
996 up_read(&ubi->fm_eba_sem);
998 if (err && pnum >= 0) {
999 err2 = ubi_wl_put_peb(ubi, vol_id, lnum, pnum, 1);
1001 ubi_warn(ubi, "failed to return physical eraseblock %d, error %d",
1004 } else if (!err && opnum >= 0) {
1005 err2 = ubi_wl_put_peb(ubi, vol_id, lnum, opnum, 0);
1007 ubi_warn(ubi, "failed to return physical eraseblock %d, error %d",
1016 * ubi_eba_write_leb - write data to dynamic volume.
1017 * @ubi: UBI device description object
1018 * @vol: volume description object
1019 * @lnum: logical eraseblock number
1020 * @buf: the data to write
1021 * @offset: offset within the logical eraseblock where to write
1022 * @len: how many bytes to write
1024 * This function writes data to logical eraseblock @lnum of a dynamic volume
1025 * @vol. Returns zero in case of success and a negative error code in case
1026 * of failure. In case of error, it is possible that something was still
1027 * written to the flash media, but may be some garbage.
1028 * This function retries %UBI_IO_RETRIES times before giving up.
1030 int ubi_eba_write_leb(struct ubi_device *ubi, struct ubi_volume *vol, int lnum,
1031 const void *buf, int offset, int len)
1033 int err, pnum, tries, vol_id = vol->vol_id;
1034 struct ubi_vid_io_buf *vidb;
1035 struct ubi_vid_hdr *vid_hdr;
1040 err = leb_write_lock(ubi, vol_id, lnum);
1044 pnum = vol->eba_tbl->entries[lnum].pnum;
1046 err = check_mapping(ubi, vol, lnum, &pnum);
1052 dbg_eba("write %d bytes at offset %d of LEB %d:%d, PEB %d",
1053 len, offset, vol_id, lnum, pnum);
1055 err = ubi_io_write_data(ubi, buf, pnum, offset, len);
1057 ubi_warn(ubi, "failed to write data to PEB %d", pnum);
1058 if (err == -EIO && ubi->bad_allowed)
1059 err = recover_peb(ubi, pnum, vol_id, lnum, buf,
1067 * The logical eraseblock is not mapped. We have to get a free physical
1068 * eraseblock and write the volume identifier header there first.
1070 vidb = ubi_alloc_vid_buf(ubi, GFP_NOFS);
1072 leb_write_unlock(ubi, vol_id, lnum);
1076 vid_hdr = ubi_get_vid_hdr(vidb);
1078 vid_hdr->vol_type = UBI_VID_DYNAMIC;
1079 vid_hdr->sqnum = cpu_to_be64(ubi_next_sqnum(ubi));
1080 vid_hdr->vol_id = cpu_to_be32(vol_id);
1081 vid_hdr->lnum = cpu_to_be32(lnum);
1082 vid_hdr->compat = ubi_get_compat(ubi, vol_id);
1083 vid_hdr->data_pad = cpu_to_be32(vol->data_pad);
1085 for (tries = 0; tries <= UBI_IO_RETRIES; tries++) {
1086 err = try_write_vid_and_data(vol, lnum, vidb, buf, offset, len);
1087 if (err != -EIO || !ubi->bad_allowed)
1091 * Fortunately, this is the first write operation to this
1092 * physical eraseblock, so just put it and request a new one.
1093 * We assume that if this physical eraseblock went bad, the
1094 * erase code will handle that.
1096 vid_hdr->sqnum = cpu_to_be64(ubi_next_sqnum(ubi));
1097 ubi_msg(ubi, "try another PEB");
1100 ubi_free_vid_buf(vidb);
1106 leb_write_unlock(ubi, vol_id, lnum);
1112 * ubi_eba_write_leb_st - write data to static volume.
1113 * @ubi: UBI device description object
1114 * @vol: volume description object
1115 * @lnum: logical eraseblock number
1116 * @buf: data to write
1117 * @len: how many bytes to write
1118 * @used_ebs: how many logical eraseblocks will this volume contain
1120 * This function writes data to logical eraseblock @lnum of static volume
1121 * @vol. The @used_ebs argument should contain total number of logical
1122 * eraseblock in this static volume.
1124 * When writing to the last logical eraseblock, the @len argument doesn't have
1125 * to be aligned to the minimal I/O unit size. Instead, it has to be equivalent
1126 * to the real data size, although the @buf buffer has to contain the
1127 * alignment. In all other cases, @len has to be aligned.
1129 * It is prohibited to write more than once to logical eraseblocks of static
1130 * volumes. This function returns zero in case of success and a negative error
1131 * code in case of failure.
1133 int ubi_eba_write_leb_st(struct ubi_device *ubi, struct ubi_volume *vol,
1134 int lnum, const void *buf, int len, int used_ebs)
1136 int err, tries, data_size = len, vol_id = vol->vol_id;
1137 struct ubi_vid_io_buf *vidb;
1138 struct ubi_vid_hdr *vid_hdr;
1144 if (lnum == used_ebs - 1)
1145 /* If this is the last LEB @len may be unaligned */
1146 len = ALIGN(data_size, ubi->min_io_size);
1148 ubi_assert(!(len & (ubi->min_io_size - 1)));
1150 vidb = ubi_alloc_vid_buf(ubi, GFP_NOFS);
1154 vid_hdr = ubi_get_vid_hdr(vidb);
1156 err = leb_write_lock(ubi, vol_id, lnum);
1160 vid_hdr->sqnum = cpu_to_be64(ubi_next_sqnum(ubi));
1161 vid_hdr->vol_id = cpu_to_be32(vol_id);
1162 vid_hdr->lnum = cpu_to_be32(lnum);
1163 vid_hdr->compat = ubi_get_compat(ubi, vol_id);
1164 vid_hdr->data_pad = cpu_to_be32(vol->data_pad);
1166 crc = crc32(UBI_CRC32_INIT, buf, data_size);
1167 vid_hdr->vol_type = UBI_VID_STATIC;
1168 vid_hdr->data_size = cpu_to_be32(data_size);
1169 vid_hdr->used_ebs = cpu_to_be32(used_ebs);
1170 vid_hdr->data_crc = cpu_to_be32(crc);
1172 ubi_assert(vol->eba_tbl->entries[lnum].pnum < 0);
1174 for (tries = 0; tries <= UBI_IO_RETRIES; tries++) {
1175 err = try_write_vid_and_data(vol, lnum, vidb, buf, 0, len);
1176 if (err != -EIO || !ubi->bad_allowed)
1179 vid_hdr->sqnum = cpu_to_be64(ubi_next_sqnum(ubi));
1180 ubi_msg(ubi, "try another PEB");
1186 leb_write_unlock(ubi, vol_id, lnum);
1189 ubi_free_vid_buf(vidb);
1195 * ubi_eba_atomic_leb_change - change logical eraseblock atomically.
1196 * @ubi: UBI device description object
1197 * @vol: volume description object
1198 * @lnum: logical eraseblock number
1199 * @buf: data to write
1200 * @len: how many bytes to write
1202 * This function changes the contents of a logical eraseblock atomically. @buf
1203 * has to contain new logical eraseblock data, and @len - the length of the
1204 * data, which has to be aligned. This function guarantees that in case of an
1205 * unclean reboot the old contents is preserved. Returns zero in case of
1206 * success and a negative error code in case of failure.
1208 * UBI reserves one LEB for the "atomic LEB change" operation, so only one
1209 * LEB change may be done at a time. This is ensured by @ubi->alc_mutex.
1211 int ubi_eba_atomic_leb_change(struct ubi_device *ubi, struct ubi_volume *vol,
1212 int lnum, const void *buf, int len)
1214 int err, tries, vol_id = vol->vol_id;
1215 struct ubi_vid_io_buf *vidb;
1216 struct ubi_vid_hdr *vid_hdr;
1224 * Special case when data length is zero. In this case the LEB
1225 * has to be unmapped and mapped somewhere else.
1227 err = ubi_eba_unmap_leb(ubi, vol, lnum);
1230 return ubi_eba_write_leb(ubi, vol, lnum, NULL, 0, 0);
1233 vidb = ubi_alloc_vid_buf(ubi, GFP_NOFS);
1237 vid_hdr = ubi_get_vid_hdr(vidb);
1239 mutex_lock(&ubi->alc_mutex);
1240 err = leb_write_lock(ubi, vol_id, lnum);
1244 vid_hdr->sqnum = cpu_to_be64(ubi_next_sqnum(ubi));
1245 vid_hdr->vol_id = cpu_to_be32(vol_id);
1246 vid_hdr->lnum = cpu_to_be32(lnum);
1247 vid_hdr->compat = ubi_get_compat(ubi, vol_id);
1248 vid_hdr->data_pad = cpu_to_be32(vol->data_pad);
1250 crc = crc32(UBI_CRC32_INIT, buf, len);
1251 vid_hdr->vol_type = UBI_VID_DYNAMIC;
1252 vid_hdr->data_size = cpu_to_be32(len);
1253 vid_hdr->copy_flag = 1;
1254 vid_hdr->data_crc = cpu_to_be32(crc);
1256 dbg_eba("change LEB %d:%d", vol_id, lnum);
1258 for (tries = 0; tries <= UBI_IO_RETRIES; tries++) {
1259 err = try_write_vid_and_data(vol, lnum, vidb, buf, 0, len);
1260 if (err != -EIO || !ubi->bad_allowed)
1263 vid_hdr->sqnum = cpu_to_be64(ubi_next_sqnum(ubi));
1264 ubi_msg(ubi, "try another PEB");
1268 * This flash device does not admit of bad eraseblocks or
1269 * something nasty and unexpected happened. Switch to read-only
1270 * mode just in case.
1275 leb_write_unlock(ubi, vol_id, lnum);
1278 mutex_unlock(&ubi->alc_mutex);
1279 ubi_free_vid_buf(vidb);
1284 * is_error_sane - check whether a read error is sane.
1285 * @err: code of the error happened during reading
1287 * This is a helper function for 'ubi_eba_copy_leb()' which is called when we
1288 * cannot read data from the target PEB (an error @err happened). If the error
1289 * code is sane, then we treat this error as non-fatal. Otherwise the error is
1290 * fatal and UBI will be switched to R/O mode later.
1292 * The idea is that we try not to switch to R/O mode if the read error is
1293 * something which suggests there was a real read problem. E.g., %-EIO. Or a
1294 * memory allocation failed (-%ENOMEM). Otherwise, it is safer to switch to R/O
1295 * mode, simply because we do not know what happened at the MTD level, and we
1296 * cannot handle this. E.g., the underlying driver may have become crazy, and
1297 * it is safer to switch to R/O mode to preserve the data.
1299 * And bear in mind, this is about reading from the target PEB, i.e. the PEB
1300 * which we have just written.
1302 static int is_error_sane(int err)
1304 if (err == -EIO || err == -ENOMEM || err == UBI_IO_BAD_HDR ||
1305 err == UBI_IO_BAD_HDR_EBADMSG || err == -ETIMEDOUT)
1311 * ubi_eba_copy_leb - copy logical eraseblock.
1312 * @ubi: UBI device description object
1313 * @from: physical eraseblock number from where to copy
1314 * @to: physical eraseblock number where to copy
1315 * @vid_hdr: VID header of the @from physical eraseblock
1317 * This function copies logical eraseblock from physical eraseblock @from to
1318 * physical eraseblock @to. The @vid_hdr buffer may be changed by this
1319 * function. Returns:
1320 * o %0 in case of success;
1321 * o %MOVE_CANCEL_RACE, %MOVE_TARGET_WR_ERR, %MOVE_TARGET_BITFLIPS, etc;
1322 * o a negative error code in case of failure.
1324 int ubi_eba_copy_leb(struct ubi_device *ubi, int from, int to,
1325 struct ubi_vid_io_buf *vidb)
1327 int err, vol_id, lnum, data_size, aldata_size, idx;
1328 struct ubi_vid_hdr *vid_hdr = ubi_get_vid_hdr(vidb);
1329 struct ubi_volume *vol;
1332 ubi_assert(rwsem_is_locked(&ubi->fm_eba_sem));
1334 vol_id = be32_to_cpu(vid_hdr->vol_id);
1335 lnum = be32_to_cpu(vid_hdr->lnum);
1337 dbg_wl("copy LEB %d:%d, PEB %d to PEB %d", vol_id, lnum, from, to);
1339 if (vid_hdr->vol_type == UBI_VID_STATIC) {
1340 data_size = be32_to_cpu(vid_hdr->data_size);
1341 aldata_size = ALIGN(data_size, ubi->min_io_size);
1343 data_size = aldata_size =
1344 ubi->leb_size - be32_to_cpu(vid_hdr->data_pad);
1346 idx = vol_id2idx(ubi, vol_id);
1347 spin_lock(&ubi->volumes_lock);
1349 * Note, we may race with volume deletion, which means that the volume
1350 * this logical eraseblock belongs to might be being deleted. Since the
1351 * volume deletion un-maps all the volume's logical eraseblocks, it will
1352 * be locked in 'ubi_wl_put_peb()' and wait for the WL worker to finish.
1354 vol = ubi->volumes[idx];
1355 spin_unlock(&ubi->volumes_lock);
1357 /* No need to do further work, cancel */
1358 dbg_wl("volume %d is being removed, cancel", vol_id);
1359 return MOVE_CANCEL_RACE;
1363 * We do not want anybody to write to this logical eraseblock while we
1364 * are moving it, so lock it.
1366 * Note, we are using non-waiting locking here, because we cannot sleep
1367 * on the LEB, since it may cause deadlocks. Indeed, imagine a task is
1368 * unmapping the LEB which is mapped to the PEB we are going to move
1369 * (@from). This task locks the LEB and goes sleep in the
1370 * 'ubi_wl_put_peb()' function on the @ubi->move_mutex. In turn, we are
1371 * holding @ubi->move_mutex and go sleep on the LEB lock. So, if the
1372 * LEB is already locked, we just do not move it and return
1373 * %MOVE_RETRY. Note, we do not return %MOVE_CANCEL_RACE here because
1374 * we do not know the reasons of the contention - it may be just a
1375 * normal I/O on this LEB, so we want to re-try.
1377 err = leb_write_trylock(ubi, vol_id, lnum);
1379 dbg_wl("contention on LEB %d:%d, cancel", vol_id, lnum);
1384 * The LEB might have been put meanwhile, and the task which put it is
1385 * probably waiting on @ubi->move_mutex. No need to continue the work,
1388 if (vol->eba_tbl->entries[lnum].pnum != from) {
1389 dbg_wl("LEB %d:%d is no longer mapped to PEB %d, mapped to PEB %d, cancel",
1390 vol_id, lnum, from, vol->eba_tbl->entries[lnum].pnum);
1391 err = MOVE_CANCEL_RACE;
1392 goto out_unlock_leb;
1396 * OK, now the LEB is locked and we can safely start moving it. Since
1397 * this function utilizes the @ubi->peb_buf buffer which is shared
1398 * with some other functions - we lock the buffer by taking the
1401 mutex_lock(&ubi->buf_mutex);
1402 dbg_wl("read %d bytes of data", aldata_size);
1403 err = ubi_io_read_data(ubi, ubi->peb_buf, from, 0, aldata_size);
1404 if (err && err != UBI_IO_BITFLIPS) {
1405 ubi_warn(ubi, "error %d while reading data from PEB %d",
1407 err = MOVE_SOURCE_RD_ERR;
1408 goto out_unlock_buf;
1412 * Now we have got to calculate how much data we have to copy. In
1413 * case of a static volume it is fairly easy - the VID header contains
1414 * the data size. In case of a dynamic volume it is more difficult - we
1415 * have to read the contents, cut 0xFF bytes from the end and copy only
1416 * the first part. We must do this to avoid writing 0xFF bytes as it
1417 * may have some side-effects. And not only this. It is important not
1418 * to include those 0xFFs to CRC because later the they may be filled
1421 if (vid_hdr->vol_type == UBI_VID_DYNAMIC)
1422 aldata_size = data_size =
1423 ubi_calc_data_len(ubi, ubi->peb_buf, data_size);
1426 crc = crc32(UBI_CRC32_INIT, ubi->peb_buf, data_size);
1430 * It may turn out to be that the whole @from physical eraseblock
1431 * contains only 0xFF bytes. Then we have to only write the VID header
1432 * and do not write any data. This also means we should not set
1433 * @vid_hdr->copy_flag, @vid_hdr->data_size, and @vid_hdr->data_crc.
1435 if (data_size > 0) {
1436 vid_hdr->copy_flag = 1;
1437 vid_hdr->data_size = cpu_to_be32(data_size);
1438 vid_hdr->data_crc = cpu_to_be32(crc);
1440 vid_hdr->sqnum = cpu_to_be64(ubi_next_sqnum(ubi));
1442 err = ubi_io_write_vid_hdr(ubi, to, vidb);
1445 err = MOVE_TARGET_WR_ERR;
1446 goto out_unlock_buf;
1451 /* Read the VID header back and check if it was written correctly */
1452 err = ubi_io_read_vid_hdr(ubi, to, vidb, 1);
1454 if (err != UBI_IO_BITFLIPS) {
1455 ubi_warn(ubi, "error %d while reading VID header back from PEB %d",
1457 if (is_error_sane(err))
1458 err = MOVE_TARGET_RD_ERR;
1460 err = MOVE_TARGET_BITFLIPS;
1461 goto out_unlock_buf;
1464 if (data_size > 0) {
1465 err = ubi_io_write_data(ubi, ubi->peb_buf, to, 0, aldata_size);
1468 err = MOVE_TARGET_WR_ERR;
1469 goto out_unlock_buf;
1475 ubi_assert(vol->eba_tbl->entries[lnum].pnum == from);
1476 vol->eba_tbl->entries[lnum].pnum = to;
1479 mutex_unlock(&ubi->buf_mutex);
1481 leb_write_unlock(ubi, vol_id, lnum);
1486 * print_rsvd_warning - warn about not having enough reserved PEBs.
1487 * @ubi: UBI device description object
1489 * This is a helper function for 'ubi_eba_init()' which is called when UBI
1490 * cannot reserve enough PEBs for bad block handling. This function makes a
1491 * decision whether we have to print a warning or not. The algorithm is as
1493 * o if this is a new UBI image, then just print the warning
1494 * o if this is an UBI image which has already been used for some time, print
1495 * a warning only if we can reserve less than 10% of the expected amount of
1498 * The idea is that when UBI is used, PEBs become bad, and the reserved pool
1499 * of PEBs becomes smaller, which is normal and we do not want to scare users
1500 * with a warning every time they attach the MTD device. This was an issue
1501 * reported by real users.
1503 static void print_rsvd_warning(struct ubi_device *ubi,
1504 struct ubi_attach_info *ai)
1507 * The 1 << 18 (256KiB) number is picked randomly, just a reasonably
1508 * large number to distinguish between newly flashed and used images.
1510 if (ai->max_sqnum > (1 << 18)) {
1511 int min = ubi->beb_rsvd_level / 10;
1515 if (ubi->beb_rsvd_pebs > min)
1519 ubi_warn(ubi, "cannot reserve enough PEBs for bad PEB handling, reserved %d, need %d",
1520 ubi->beb_rsvd_pebs, ubi->beb_rsvd_level);
1521 if (ubi->corr_peb_count)
1522 ubi_warn(ubi, "%d PEBs are corrupted and not used",
1523 ubi->corr_peb_count);
1527 * self_check_eba - run a self check on the EBA table constructed by fastmap.
1528 * @ubi: UBI device description object
1529 * @ai_fastmap: UBI attach info object created by fastmap
1530 * @ai_scan: UBI attach info object created by scanning
1532 * Returns < 0 in case of an internal error, 0 otherwise.
1533 * If a bad EBA table entry was found it will be printed out and
1534 * ubi_assert() triggers.
1536 int self_check_eba(struct ubi_device *ubi, struct ubi_attach_info *ai_fastmap,
1537 struct ubi_attach_info *ai_scan)
1539 int i, j, num_volumes, ret = 0;
1540 int **scan_eba, **fm_eba;
1541 struct ubi_ainf_volume *av;
1542 struct ubi_volume *vol;
1543 struct ubi_ainf_peb *aeb;
1546 num_volumes = ubi->vtbl_slots + UBI_INT_VOL_COUNT;
1548 scan_eba = kmalloc_array(num_volumes, sizeof(*scan_eba), GFP_KERNEL);
1552 fm_eba = kmalloc_array(num_volumes, sizeof(*fm_eba), GFP_KERNEL);
1558 for (i = 0; i < num_volumes; i++) {
1559 vol = ubi->volumes[i];
1563 scan_eba[i] = kmalloc_array(vol->reserved_pebs,
1571 fm_eba[i] = kmalloc_array(vol->reserved_pebs,
1579 for (j = 0; j < vol->reserved_pebs; j++)
1580 scan_eba[i][j] = fm_eba[i][j] = UBI_LEB_UNMAPPED;
1582 av = ubi_find_av(ai_scan, idx2vol_id(ubi, i));
1586 ubi_rb_for_each_entry(rb, aeb, &av->root, u.rb)
1587 scan_eba[i][aeb->lnum] = aeb->pnum;
1589 av = ubi_find_av(ai_fastmap, idx2vol_id(ubi, i));
1593 ubi_rb_for_each_entry(rb, aeb, &av->root, u.rb)
1594 fm_eba[i][aeb->lnum] = aeb->pnum;
1596 for (j = 0; j < vol->reserved_pebs; j++) {
1597 if (scan_eba[i][j] != fm_eba[i][j]) {
1598 if (scan_eba[i][j] == UBI_LEB_UNMAPPED ||
1599 fm_eba[i][j] == UBI_LEB_UNMAPPED)
1602 ubi_err(ubi, "LEB:%i:%i is PEB:%i instead of %i!",
1603 vol->vol_id, j, fm_eba[i][j],
1611 for (i = 0; i < num_volumes; i++) {
1612 if (!ubi->volumes[i])
1625 * ubi_eba_init - initialize the EBA sub-system using attaching information.
1626 * @ubi: UBI device description object
1627 * @ai: attaching information
1629 * This function returns zero in case of success and a negative error code in
1632 int ubi_eba_init(struct ubi_device *ubi, struct ubi_attach_info *ai)
1634 int i, err, num_volumes;
1635 struct ubi_ainf_volume *av;
1636 struct ubi_volume *vol;
1637 struct ubi_ainf_peb *aeb;
1640 dbg_eba("initialize EBA sub-system");
1642 spin_lock_init(&ubi->ltree_lock);
1643 mutex_init(&ubi->alc_mutex);
1644 ubi->ltree = RB_ROOT;
1646 ubi->global_sqnum = ai->max_sqnum + 1;
1647 num_volumes = ubi->vtbl_slots + UBI_INT_VOL_COUNT;
1649 for (i = 0; i < num_volumes; i++) {
1650 struct ubi_eba_table *tbl;
1652 vol = ubi->volumes[i];
1658 tbl = ubi_eba_create_table(vol, vol->reserved_pebs);
1664 ubi_eba_replace_table(vol, tbl);
1666 av = ubi_find_av(ai, idx2vol_id(ubi, i));
1670 ubi_rb_for_each_entry(rb, aeb, &av->root, u.rb) {
1671 if (aeb->lnum >= vol->reserved_pebs) {
1673 * This may happen in case of an unclean reboot
1676 ubi_move_aeb_to_list(av, aeb, &ai->erase);
1678 struct ubi_eba_entry *entry;
1680 entry = &vol->eba_tbl->entries[aeb->lnum];
1681 entry->pnum = aeb->pnum;
1686 if (ubi->avail_pebs < EBA_RESERVED_PEBS) {
1687 ubi_err(ubi, "no enough physical eraseblocks (%d, need %d)",
1688 ubi->avail_pebs, EBA_RESERVED_PEBS);
1689 if (ubi->corr_peb_count)
1690 ubi_err(ubi, "%d PEBs are corrupted and not used",
1691 ubi->corr_peb_count);
1695 ubi->avail_pebs -= EBA_RESERVED_PEBS;
1696 ubi->rsvd_pebs += EBA_RESERVED_PEBS;
1698 if (ubi->bad_allowed) {
1699 ubi_calculate_reserved(ubi);
1701 if (ubi->avail_pebs < ubi->beb_rsvd_level) {
1702 /* No enough free physical eraseblocks */
1703 ubi->beb_rsvd_pebs = ubi->avail_pebs;
1704 print_rsvd_warning(ubi, ai);
1706 ubi->beb_rsvd_pebs = ubi->beb_rsvd_level;
1708 ubi->avail_pebs -= ubi->beb_rsvd_pebs;
1709 ubi->rsvd_pebs += ubi->beb_rsvd_pebs;
1712 dbg_eba("EBA sub-system is initialized");
1716 for (i = 0; i < num_volumes; i++) {
1717 if (!ubi->volumes[i])
1719 ubi_eba_replace_table(ubi->volumes[i], NULL);