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_lock - 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;
517 if (!ubi->fast_attach)
520 if (!vol->checkmap || test_bit(lnum, vol->checkmap))
523 vidb = ubi_alloc_vid_buf(ubi, GFP_NOFS);
527 err = ubi_io_read_vid_hdr(ubi, *pnum, vidb, 0);
528 if (err > 0 && err != UBI_IO_BITFLIPS) {
533 case UBI_IO_FF_BITFLIPS:
535 case UBI_IO_BAD_HDR_EBADMSG:
541 if (err == UBI_IO_BAD_HDR_EBADMSG || err == UBI_IO_FF_BITFLIPS)
544 down_read(&ubi->fm_eba_sem);
545 vol->eba_tbl->entries[lnum].pnum = UBI_LEB_UNMAPPED;
546 up_read(&ubi->fm_eba_sem);
547 ubi_wl_put_peb(ubi, vol->vol_id, lnum, *pnum, torture);
549 *pnum = UBI_LEB_UNMAPPED;
550 } else if (err < 0) {
551 ubi_err(ubi, "unable to read VID header back from PEB %i: %i",
557 set_bit(lnum, vol->checkmap);
561 ubi_free_vid_buf(vidb);
566 static int check_mapping(struct ubi_device *ubi, struct ubi_volume *vol, int lnum,
574 * ubi_eba_read_leb - read data.
575 * @ubi: UBI device description object
576 * @vol: volume description object
577 * @lnum: logical eraseblock number
578 * @buf: buffer to store the read data
579 * @offset: offset from where to read
580 * @len: how many bytes to read
581 * @check: data CRC check flag
583 * If the logical eraseblock @lnum is unmapped, @buf is filled with 0xFF
584 * bytes. The @check flag only makes sense for static volumes and forces
585 * eraseblock data CRC checking.
587 * In case of success this function returns zero. In case of a static volume,
588 * if data CRC mismatches - %-EBADMSG is returned. %-EBADMSG may also be
589 * returned for any volume type if an ECC error was detected by the MTD device
590 * driver. Other negative error cored may be returned in case of other errors.
592 int ubi_eba_read_leb(struct ubi_device *ubi, struct ubi_volume *vol, int lnum,
593 void *buf, int offset, int len, int check)
595 int err, pnum, scrub = 0, vol_id = vol->vol_id;
596 struct ubi_vid_io_buf *vidb;
597 struct ubi_vid_hdr *vid_hdr;
598 uint32_t uninitialized_var(crc);
600 err = leb_read_lock(ubi, vol_id, lnum);
604 pnum = vol->eba_tbl->entries[lnum].pnum;
606 err = check_mapping(ubi, vol, lnum, &pnum);
611 if (pnum == UBI_LEB_UNMAPPED) {
613 * The logical eraseblock is not mapped, fill the whole buffer
614 * with 0xFF bytes. The exception is static volumes for which
615 * it is an error to read unmapped logical eraseblocks.
617 dbg_eba("read %d bytes from offset %d of LEB %d:%d (unmapped)",
618 len, offset, vol_id, lnum);
619 leb_read_unlock(ubi, vol_id, lnum);
620 ubi_assert(vol->vol_type != UBI_STATIC_VOLUME);
621 memset(buf, 0xFF, len);
625 dbg_eba("read %d bytes from offset %d of LEB %d:%d, PEB %d",
626 len, offset, vol_id, lnum, pnum);
628 if (vol->vol_type == UBI_DYNAMIC_VOLUME)
633 vidb = ubi_alloc_vid_buf(ubi, GFP_NOFS);
639 vid_hdr = ubi_get_vid_hdr(vidb);
641 err = ubi_io_read_vid_hdr(ubi, pnum, vidb, 1);
642 if (err && err != UBI_IO_BITFLIPS) {
645 * The header is either absent or corrupted.
646 * The former case means there is a bug -
647 * switch to read-only mode just in case.
648 * The latter case means a real corruption - we
649 * may try to recover data. FIXME: but this is
652 if (err == UBI_IO_BAD_HDR_EBADMSG ||
653 err == UBI_IO_BAD_HDR) {
654 ubi_warn(ubi, "corrupted VID header at PEB %d, LEB %d:%d",
659 * Ending up here in the non-Fastmap case
660 * is a clear bug as the VID header had to
661 * be present at scan time to have it referenced.
662 * With fastmap the story is more complicated.
663 * Fastmap has the mapping info without the need
664 * of a full scan. So the LEB could have been
665 * unmapped, Fastmap cannot know this and keeps
666 * the LEB referenced.
667 * This is valid and works as the layer above UBI
668 * has to do bookkeeping about used/referenced
671 if (ubi->fast_attach) {
680 } else if (err == UBI_IO_BITFLIPS)
683 ubi_assert(lnum < be32_to_cpu(vid_hdr->used_ebs));
684 ubi_assert(len == be32_to_cpu(vid_hdr->data_size));
686 crc = be32_to_cpu(vid_hdr->data_crc);
687 ubi_free_vid_buf(vidb);
690 err = ubi_io_read_data(ubi, buf, pnum, offset, len);
692 if (err == UBI_IO_BITFLIPS)
694 else if (mtd_is_eccerr(err)) {
695 if (vol->vol_type == UBI_DYNAMIC_VOLUME)
699 ubi_msg(ubi, "force data checking");
708 uint32_t crc1 = crc32(UBI_CRC32_INIT, buf, len);
710 ubi_warn(ubi, "CRC error: calculated %#08x, must be %#08x",
718 err = ubi_wl_scrub_peb(ubi, pnum);
720 leb_read_unlock(ubi, vol_id, lnum);
724 ubi_free_vid_buf(vidb);
726 leb_read_unlock(ubi, vol_id, lnum);
731 * ubi_eba_read_leb_sg - read data into a scatter gather list.
732 * @ubi: UBI device description object
733 * @vol: volume description object
734 * @lnum: logical eraseblock number
735 * @sgl: UBI scatter gather list to store the read data
736 * @offset: offset from where to read
737 * @len: how many bytes to read
738 * @check: data CRC check flag
740 * This function works exactly like ubi_eba_read_leb(). But instead of
741 * storing the read data into a buffer it writes to an UBI scatter gather
744 int ubi_eba_read_leb_sg(struct ubi_device *ubi, struct ubi_volume *vol,
745 struct ubi_sgl *sgl, int lnum, int offset, int len,
750 struct scatterlist *sg;
753 ubi_assert(sgl->list_pos < UBI_MAX_SG_COUNT);
754 sg = &sgl->sg[sgl->list_pos];
755 if (len < sg->length - sgl->page_pos)
758 to_read = sg->length - sgl->page_pos;
760 ret = ubi_eba_read_leb(ubi, vol, lnum,
761 sg_virt(sg) + sgl->page_pos, offset,
769 sgl->page_pos += to_read;
770 if (sgl->page_pos == sg->length) {
786 * try_recover_peb - try to recover from write failure.
787 * @vol: volume description object
788 * @pnum: the physical eraseblock to recover
789 * @lnum: logical eraseblock number
790 * @buf: data which was not written because of the write failure
791 * @offset: offset of the failed write
792 * @len: how many bytes should have been written
794 * @retry: whether the caller should retry in case of failure
796 * This function is called in case of a write failure and moves all good data
797 * from the potentially bad physical eraseblock to a good physical eraseblock.
798 * This function also writes the data which was not written due to the failure.
799 * Returns 0 in case of success, and a negative error code in case of failure.
800 * In case of failure, the %retry parameter is set to false if this is a fatal
801 * error (retrying won't help), and true otherwise.
803 static int try_recover_peb(struct ubi_volume *vol, int pnum, int lnum,
804 const void *buf, int offset, int len,
805 struct ubi_vid_io_buf *vidb, bool *retry)
807 struct ubi_device *ubi = vol->ubi;
808 struct ubi_vid_hdr *vid_hdr;
809 int new_pnum, err, vol_id = vol->vol_id, data_size;
814 new_pnum = ubi_wl_get_peb(ubi);
820 ubi_msg(ubi, "recover PEB %d, move data to PEB %d",
823 err = ubi_io_read_vid_hdr(ubi, pnum, vidb, 1);
824 if (err && err != UBI_IO_BITFLIPS) {
830 vid_hdr = ubi_get_vid_hdr(vidb);
831 ubi_assert(vid_hdr->vol_type == UBI_VID_DYNAMIC);
833 mutex_lock(&ubi->buf_mutex);
834 memset(ubi->peb_buf + offset, 0xFF, len);
836 /* Read everything before the area where the write failure happened */
838 err = ubi_io_read_data(ubi, ubi->peb_buf, pnum, 0, offset);
839 if (err && err != UBI_IO_BITFLIPS)
845 memcpy(ubi->peb_buf + offset, buf, len);
847 data_size = offset + len;
848 crc = crc32(UBI_CRC32_INIT, ubi->peb_buf, data_size);
849 vid_hdr->sqnum = cpu_to_be64(ubi_next_sqnum(ubi));
850 vid_hdr->copy_flag = 1;
851 vid_hdr->data_size = cpu_to_be32(data_size);
852 vid_hdr->data_crc = cpu_to_be32(crc);
853 err = ubi_io_write_vid_hdr(ubi, new_pnum, vidb);
857 err = ubi_io_write_data(ubi, ubi->peb_buf, new_pnum, 0, data_size);
860 mutex_unlock(&ubi->buf_mutex);
863 vol->eba_tbl->entries[lnum].pnum = new_pnum;
866 up_read(&ubi->fm_eba_sem);
869 ubi_wl_put_peb(ubi, vol_id, lnum, pnum, 1);
870 ubi_msg(ubi, "data was successfully recovered");
871 } else if (new_pnum >= 0) {
873 * Bad luck? This physical eraseblock is bad too? Crud. Let's
874 * try to get another one.
876 ubi_wl_put_peb(ubi, vol_id, lnum, new_pnum, 1);
877 ubi_warn(ubi, "failed to write to PEB %d", new_pnum);
884 * recover_peb - recover from write failure.
885 * @ubi: UBI device description object
886 * @pnum: the physical eraseblock to recover
888 * @lnum: logical eraseblock number
889 * @buf: data which was not written because of the write failure
890 * @offset: offset of the failed write
891 * @len: how many bytes should have been written
893 * This function is called in case of a write failure and moves all good data
894 * from the potentially bad physical eraseblock to a good physical eraseblock.
895 * This function also writes the data which was not written due to the failure.
896 * Returns 0 in case of success, and a negative error code in case of failure.
897 * This function tries %UBI_IO_RETRIES before giving up.
899 static int recover_peb(struct ubi_device *ubi, int pnum, int vol_id, int lnum,
900 const void *buf, int offset, int len)
902 int err, idx = vol_id2idx(ubi, vol_id), tries;
903 struct ubi_volume *vol = ubi->volumes[idx];
904 struct ubi_vid_io_buf *vidb;
906 vidb = ubi_alloc_vid_buf(ubi, GFP_NOFS);
910 for (tries = 0; tries <= UBI_IO_RETRIES; tries++) {
913 err = try_recover_peb(vol, pnum, lnum, buf, offset, len, vidb,
918 ubi_msg(ubi, "try again");
921 ubi_free_vid_buf(vidb);
927 * try_write_vid_and_data - try to write VID header and data to a new PEB.
928 * @vol: volume description object
929 * @lnum: logical eraseblock number
930 * @vidb: the VID buffer to write
931 * @buf: buffer containing the data
932 * @offset: where to start writing data
933 * @len: how many bytes should be written
935 * This function tries to write VID header and data belonging to logical
936 * eraseblock @lnum of volume @vol to a new physical eraseblock. Returns zero
937 * in case of success and a negative error code in case of failure.
938 * In case of error, it is possible that something was still written to the
939 * flash media, but may be some garbage.
941 static int try_write_vid_and_data(struct ubi_volume *vol, int lnum,
942 struct ubi_vid_io_buf *vidb, const void *buf,
945 struct ubi_device *ubi = vol->ubi;
946 int pnum, opnum, err, vol_id = vol->vol_id;
948 pnum = ubi_wl_get_peb(ubi);
954 opnum = vol->eba_tbl->entries[lnum].pnum;
956 dbg_eba("write VID hdr and %d bytes at offset %d of LEB %d:%d, PEB %d",
957 len, offset, vol_id, lnum, pnum);
959 err = ubi_io_write_vid_hdr(ubi, pnum, vidb);
961 ubi_warn(ubi, "failed to write VID header to LEB %d:%d, PEB %d",
967 err = ubi_io_write_data(ubi, buf, pnum, offset, len);
970 "failed to write %d bytes at offset %d of LEB %d:%d, PEB %d",
971 len, offset, vol_id, lnum, pnum);
976 vol->eba_tbl->entries[lnum].pnum = pnum;
979 up_read(&ubi->fm_eba_sem);
981 if (err && pnum >= 0)
982 err = ubi_wl_put_peb(ubi, vol_id, lnum, pnum, 1);
983 else if (!err && opnum >= 0)
984 err = ubi_wl_put_peb(ubi, vol_id, lnum, opnum, 0);
990 * ubi_eba_write_leb - write data to dynamic volume.
991 * @ubi: UBI device description object
992 * @vol: volume description object
993 * @lnum: logical eraseblock number
994 * @buf: the data to write
995 * @offset: offset within the logical eraseblock where to write
996 * @len: how many bytes to write
998 * This function writes data to logical eraseblock @lnum of a dynamic volume
999 * @vol. Returns zero in case of success and a negative error code in case
1000 * of failure. In case of error, it is possible that something was still
1001 * written to the flash media, but may be some garbage.
1002 * This function retries %UBI_IO_RETRIES times before giving up.
1004 int ubi_eba_write_leb(struct ubi_device *ubi, struct ubi_volume *vol, int lnum,
1005 const void *buf, int offset, int len)
1007 int err, pnum, tries, vol_id = vol->vol_id;
1008 struct ubi_vid_io_buf *vidb;
1009 struct ubi_vid_hdr *vid_hdr;
1014 err = leb_write_lock(ubi, vol_id, lnum);
1018 pnum = vol->eba_tbl->entries[lnum].pnum;
1020 err = check_mapping(ubi, vol, lnum, &pnum);
1026 dbg_eba("write %d bytes at offset %d of LEB %d:%d, PEB %d",
1027 len, offset, vol_id, lnum, pnum);
1029 err = ubi_io_write_data(ubi, buf, pnum, offset, len);
1031 ubi_warn(ubi, "failed to write data to PEB %d", pnum);
1032 if (err == -EIO && ubi->bad_allowed)
1033 err = recover_peb(ubi, pnum, vol_id, lnum, buf,
1041 * The logical eraseblock is not mapped. We have to get a free physical
1042 * eraseblock and write the volume identifier header there first.
1044 vidb = ubi_alloc_vid_buf(ubi, GFP_NOFS);
1046 leb_write_unlock(ubi, vol_id, lnum);
1050 vid_hdr = ubi_get_vid_hdr(vidb);
1052 vid_hdr->vol_type = UBI_VID_DYNAMIC;
1053 vid_hdr->sqnum = cpu_to_be64(ubi_next_sqnum(ubi));
1054 vid_hdr->vol_id = cpu_to_be32(vol_id);
1055 vid_hdr->lnum = cpu_to_be32(lnum);
1056 vid_hdr->compat = ubi_get_compat(ubi, vol_id);
1057 vid_hdr->data_pad = cpu_to_be32(vol->data_pad);
1059 for (tries = 0; tries <= UBI_IO_RETRIES; tries++) {
1060 err = try_write_vid_and_data(vol, lnum, vidb, buf, offset, len);
1061 if (err != -EIO || !ubi->bad_allowed)
1065 * Fortunately, this is the first write operation to this
1066 * physical eraseblock, so just put it and request a new one.
1067 * We assume that if this physical eraseblock went bad, the
1068 * erase code will handle that.
1070 vid_hdr->sqnum = cpu_to_be64(ubi_next_sqnum(ubi));
1071 ubi_msg(ubi, "try another PEB");
1074 ubi_free_vid_buf(vidb);
1080 leb_write_unlock(ubi, vol_id, lnum);
1086 * ubi_eba_write_leb_st - write data to static volume.
1087 * @ubi: UBI device description object
1088 * @vol: volume description object
1089 * @lnum: logical eraseblock number
1090 * @buf: data to write
1091 * @len: how many bytes to write
1092 * @used_ebs: how many logical eraseblocks will this volume contain
1094 * This function writes data to logical eraseblock @lnum of static volume
1095 * @vol. The @used_ebs argument should contain total number of logical
1096 * eraseblock in this static volume.
1098 * When writing to the last logical eraseblock, the @len argument doesn't have
1099 * to be aligned to the minimal I/O unit size. Instead, it has to be equivalent
1100 * to the real data size, although the @buf buffer has to contain the
1101 * alignment. In all other cases, @len has to be aligned.
1103 * It is prohibited to write more than once to logical eraseblocks of static
1104 * volumes. This function returns zero in case of success and a negative error
1105 * code in case of failure.
1107 int ubi_eba_write_leb_st(struct ubi_device *ubi, struct ubi_volume *vol,
1108 int lnum, const void *buf, int len, int used_ebs)
1110 int err, tries, data_size = len, vol_id = vol->vol_id;
1111 struct ubi_vid_io_buf *vidb;
1112 struct ubi_vid_hdr *vid_hdr;
1118 if (lnum == used_ebs - 1)
1119 /* If this is the last LEB @len may be unaligned */
1120 len = ALIGN(data_size, ubi->min_io_size);
1122 ubi_assert(!(len & (ubi->min_io_size - 1)));
1124 vidb = ubi_alloc_vid_buf(ubi, GFP_NOFS);
1128 vid_hdr = ubi_get_vid_hdr(vidb);
1130 err = leb_write_lock(ubi, vol_id, lnum);
1134 vid_hdr->sqnum = cpu_to_be64(ubi_next_sqnum(ubi));
1135 vid_hdr->vol_id = cpu_to_be32(vol_id);
1136 vid_hdr->lnum = cpu_to_be32(lnum);
1137 vid_hdr->compat = ubi_get_compat(ubi, vol_id);
1138 vid_hdr->data_pad = cpu_to_be32(vol->data_pad);
1140 crc = crc32(UBI_CRC32_INIT, buf, data_size);
1141 vid_hdr->vol_type = UBI_VID_STATIC;
1142 vid_hdr->data_size = cpu_to_be32(data_size);
1143 vid_hdr->used_ebs = cpu_to_be32(used_ebs);
1144 vid_hdr->data_crc = cpu_to_be32(crc);
1146 ubi_assert(vol->eba_tbl->entries[lnum].pnum < 0);
1148 for (tries = 0; tries <= UBI_IO_RETRIES; tries++) {
1149 err = try_write_vid_and_data(vol, lnum, vidb, buf, 0, len);
1150 if (err != -EIO || !ubi->bad_allowed)
1153 vid_hdr->sqnum = cpu_to_be64(ubi_next_sqnum(ubi));
1154 ubi_msg(ubi, "try another PEB");
1160 leb_write_unlock(ubi, vol_id, lnum);
1163 ubi_free_vid_buf(vidb);
1169 * ubi_eba_atomic_leb_change - change logical eraseblock atomically.
1170 * @ubi: UBI device description object
1171 * @vol: volume description object
1172 * @lnum: logical eraseblock number
1173 * @buf: data to write
1174 * @len: how many bytes to write
1176 * This function changes the contents of a logical eraseblock atomically. @buf
1177 * has to contain new logical eraseblock data, and @len - the length of the
1178 * data, which has to be aligned. This function guarantees that in case of an
1179 * unclean reboot the old contents is preserved. Returns zero in case of
1180 * success and a negative error code in case of failure.
1182 * UBI reserves one LEB for the "atomic LEB change" operation, so only one
1183 * LEB change may be done at a time. This is ensured by @ubi->alc_mutex.
1185 int ubi_eba_atomic_leb_change(struct ubi_device *ubi, struct ubi_volume *vol,
1186 int lnum, const void *buf, int len)
1188 int err, tries, vol_id = vol->vol_id;
1189 struct ubi_vid_io_buf *vidb;
1190 struct ubi_vid_hdr *vid_hdr;
1198 * Special case when data length is zero. In this case the LEB
1199 * has to be unmapped and mapped somewhere else.
1201 err = ubi_eba_unmap_leb(ubi, vol, lnum);
1204 return ubi_eba_write_leb(ubi, vol, lnum, NULL, 0, 0);
1207 vidb = ubi_alloc_vid_buf(ubi, GFP_NOFS);
1211 vid_hdr = ubi_get_vid_hdr(vidb);
1213 mutex_lock(&ubi->alc_mutex);
1214 err = leb_write_lock(ubi, vol_id, lnum);
1218 vid_hdr->sqnum = cpu_to_be64(ubi_next_sqnum(ubi));
1219 vid_hdr->vol_id = cpu_to_be32(vol_id);
1220 vid_hdr->lnum = cpu_to_be32(lnum);
1221 vid_hdr->compat = ubi_get_compat(ubi, vol_id);
1222 vid_hdr->data_pad = cpu_to_be32(vol->data_pad);
1224 crc = crc32(UBI_CRC32_INIT, buf, len);
1225 vid_hdr->vol_type = UBI_VID_DYNAMIC;
1226 vid_hdr->data_size = cpu_to_be32(len);
1227 vid_hdr->copy_flag = 1;
1228 vid_hdr->data_crc = cpu_to_be32(crc);
1230 dbg_eba("change LEB %d:%d", vol_id, lnum);
1232 for (tries = 0; tries <= UBI_IO_RETRIES; tries++) {
1233 err = try_write_vid_and_data(vol, lnum, vidb, buf, 0, len);
1234 if (err != -EIO || !ubi->bad_allowed)
1237 vid_hdr->sqnum = cpu_to_be64(ubi_next_sqnum(ubi));
1238 ubi_msg(ubi, "try another PEB");
1242 * This flash device does not admit of bad eraseblocks or
1243 * something nasty and unexpected happened. Switch to read-only
1244 * mode just in case.
1249 leb_write_unlock(ubi, vol_id, lnum);
1252 mutex_unlock(&ubi->alc_mutex);
1253 ubi_free_vid_buf(vidb);
1258 * is_error_sane - check whether a read error is sane.
1259 * @err: code of the error happened during reading
1261 * This is a helper function for 'ubi_eba_copy_leb()' which is called when we
1262 * cannot read data from the target PEB (an error @err happened). If the error
1263 * code is sane, then we treat this error as non-fatal. Otherwise the error is
1264 * fatal and UBI will be switched to R/O mode later.
1266 * The idea is that we try not to switch to R/O mode if the read error is
1267 * something which suggests there was a real read problem. E.g., %-EIO. Or a
1268 * memory allocation failed (-%ENOMEM). Otherwise, it is safer to switch to R/O
1269 * mode, simply because we do not know what happened at the MTD level, and we
1270 * cannot handle this. E.g., the underlying driver may have become crazy, and
1271 * it is safer to switch to R/O mode to preserve the data.
1273 * And bear in mind, this is about reading from the target PEB, i.e. the PEB
1274 * which we have just written.
1276 static int is_error_sane(int err)
1278 if (err == -EIO || err == -ENOMEM || err == UBI_IO_BAD_HDR ||
1279 err == UBI_IO_BAD_HDR_EBADMSG || err == -ETIMEDOUT)
1285 * ubi_eba_copy_leb - copy logical eraseblock.
1286 * @ubi: UBI device description object
1287 * @from: physical eraseblock number from where to copy
1288 * @to: physical eraseblock number where to copy
1289 * @vid_hdr: VID header of the @from physical eraseblock
1291 * This function copies logical eraseblock from physical eraseblock @from to
1292 * physical eraseblock @to. The @vid_hdr buffer may be changed by this
1293 * function. Returns:
1294 * o %0 in case of success;
1295 * o %MOVE_CANCEL_RACE, %MOVE_TARGET_WR_ERR, %MOVE_TARGET_BITFLIPS, etc;
1296 * o a negative error code in case of failure.
1298 int ubi_eba_copy_leb(struct ubi_device *ubi, int from, int to,
1299 struct ubi_vid_io_buf *vidb)
1301 int err, vol_id, lnum, data_size, aldata_size, idx;
1302 struct ubi_vid_hdr *vid_hdr = ubi_get_vid_hdr(vidb);
1303 struct ubi_volume *vol;
1306 ubi_assert(rwsem_is_locked(&ubi->fm_eba_sem));
1308 vol_id = be32_to_cpu(vid_hdr->vol_id);
1309 lnum = be32_to_cpu(vid_hdr->lnum);
1311 dbg_wl("copy LEB %d:%d, PEB %d to PEB %d", vol_id, lnum, from, to);
1313 if (vid_hdr->vol_type == UBI_VID_STATIC) {
1314 data_size = be32_to_cpu(vid_hdr->data_size);
1315 aldata_size = ALIGN(data_size, ubi->min_io_size);
1317 data_size = aldata_size =
1318 ubi->leb_size - be32_to_cpu(vid_hdr->data_pad);
1320 idx = vol_id2idx(ubi, vol_id);
1321 spin_lock(&ubi->volumes_lock);
1323 * Note, we may race with volume deletion, which means that the volume
1324 * this logical eraseblock belongs to might be being deleted. Since the
1325 * volume deletion un-maps all the volume's logical eraseblocks, it will
1326 * be locked in 'ubi_wl_put_peb()' and wait for the WL worker to finish.
1328 vol = ubi->volumes[idx];
1329 spin_unlock(&ubi->volumes_lock);
1331 /* No need to do further work, cancel */
1332 dbg_wl("volume %d is being removed, cancel", vol_id);
1333 return MOVE_CANCEL_RACE;
1337 * We do not want anybody to write to this logical eraseblock while we
1338 * are moving it, so lock it.
1340 * Note, we are using non-waiting locking here, because we cannot sleep
1341 * on the LEB, since it may cause deadlocks. Indeed, imagine a task is
1342 * unmapping the LEB which is mapped to the PEB we are going to move
1343 * (@from). This task locks the LEB and goes sleep in the
1344 * 'ubi_wl_put_peb()' function on the @ubi->move_mutex. In turn, we are
1345 * holding @ubi->move_mutex and go sleep on the LEB lock. So, if the
1346 * LEB is already locked, we just do not move it and return
1347 * %MOVE_RETRY. Note, we do not return %MOVE_CANCEL_RACE here because
1348 * we do not know the reasons of the contention - it may be just a
1349 * normal I/O on this LEB, so we want to re-try.
1351 err = leb_write_trylock(ubi, vol_id, lnum);
1353 dbg_wl("contention on LEB %d:%d, cancel", vol_id, lnum);
1358 * The LEB might have been put meanwhile, and the task which put it is
1359 * probably waiting on @ubi->move_mutex. No need to continue the work,
1362 if (vol->eba_tbl->entries[lnum].pnum != from) {
1363 dbg_wl("LEB %d:%d is no longer mapped to PEB %d, mapped to PEB %d, cancel",
1364 vol_id, lnum, from, vol->eba_tbl->entries[lnum].pnum);
1365 err = MOVE_CANCEL_RACE;
1366 goto out_unlock_leb;
1370 * OK, now the LEB is locked and we can safely start moving it. Since
1371 * this function utilizes the @ubi->peb_buf buffer which is shared
1372 * with some other functions - we lock the buffer by taking the
1375 mutex_lock(&ubi->buf_mutex);
1376 dbg_wl("read %d bytes of data", aldata_size);
1377 err = ubi_io_read_data(ubi, ubi->peb_buf, from, 0, aldata_size);
1378 if (err && err != UBI_IO_BITFLIPS) {
1379 ubi_warn(ubi, "error %d while reading data from PEB %d",
1381 err = MOVE_SOURCE_RD_ERR;
1382 goto out_unlock_buf;
1386 * Now we have got to calculate how much data we have to copy. In
1387 * case of a static volume it is fairly easy - the VID header contains
1388 * the data size. In case of a dynamic volume it is more difficult - we
1389 * have to read the contents, cut 0xFF bytes from the end and copy only
1390 * the first part. We must do this to avoid writing 0xFF bytes as it
1391 * may have some side-effects. And not only this. It is important not
1392 * to include those 0xFFs to CRC because later the they may be filled
1395 if (vid_hdr->vol_type == UBI_VID_DYNAMIC)
1396 aldata_size = data_size =
1397 ubi_calc_data_len(ubi, ubi->peb_buf, data_size);
1400 crc = crc32(UBI_CRC32_INIT, ubi->peb_buf, data_size);
1404 * It may turn out to be that the whole @from physical eraseblock
1405 * contains only 0xFF bytes. Then we have to only write the VID header
1406 * and do not write any data. This also means we should not set
1407 * @vid_hdr->copy_flag, @vid_hdr->data_size, and @vid_hdr->data_crc.
1409 if (data_size > 0) {
1410 vid_hdr->copy_flag = 1;
1411 vid_hdr->data_size = cpu_to_be32(data_size);
1412 vid_hdr->data_crc = cpu_to_be32(crc);
1414 vid_hdr->sqnum = cpu_to_be64(ubi_next_sqnum(ubi));
1416 err = ubi_io_write_vid_hdr(ubi, to, vidb);
1419 err = MOVE_TARGET_WR_ERR;
1420 goto out_unlock_buf;
1425 /* Read the VID header back and check if it was written correctly */
1426 err = ubi_io_read_vid_hdr(ubi, to, vidb, 1);
1428 if (err != UBI_IO_BITFLIPS) {
1429 ubi_warn(ubi, "error %d while reading VID header back from PEB %d",
1431 if (is_error_sane(err))
1432 err = MOVE_TARGET_RD_ERR;
1434 err = MOVE_TARGET_BITFLIPS;
1435 goto out_unlock_buf;
1438 if (data_size > 0) {
1439 err = ubi_io_write_data(ubi, ubi->peb_buf, to, 0, aldata_size);
1442 err = MOVE_TARGET_WR_ERR;
1443 goto out_unlock_buf;
1449 ubi_assert(vol->eba_tbl->entries[lnum].pnum == from);
1450 vol->eba_tbl->entries[lnum].pnum = to;
1453 mutex_unlock(&ubi->buf_mutex);
1455 leb_write_unlock(ubi, vol_id, lnum);
1460 * print_rsvd_warning - warn about not having enough reserved PEBs.
1461 * @ubi: UBI device description object
1463 * This is a helper function for 'ubi_eba_init()' which is called when UBI
1464 * cannot reserve enough PEBs for bad block handling. This function makes a
1465 * decision whether we have to print a warning or not. The algorithm is as
1467 * o if this is a new UBI image, then just print the warning
1468 * o if this is an UBI image which has already been used for some time, print
1469 * a warning only if we can reserve less than 10% of the expected amount of
1472 * The idea is that when UBI is used, PEBs become bad, and the reserved pool
1473 * of PEBs becomes smaller, which is normal and we do not want to scare users
1474 * with a warning every time they attach the MTD device. This was an issue
1475 * reported by real users.
1477 static void print_rsvd_warning(struct ubi_device *ubi,
1478 struct ubi_attach_info *ai)
1481 * The 1 << 18 (256KiB) number is picked randomly, just a reasonably
1482 * large number to distinguish between newly flashed and used images.
1484 if (ai->max_sqnum > (1 << 18)) {
1485 int min = ubi->beb_rsvd_level / 10;
1489 if (ubi->beb_rsvd_pebs > min)
1493 ubi_warn(ubi, "cannot reserve enough PEBs for bad PEB handling, reserved %d, need %d",
1494 ubi->beb_rsvd_pebs, ubi->beb_rsvd_level);
1495 if (ubi->corr_peb_count)
1496 ubi_warn(ubi, "%d PEBs are corrupted and not used",
1497 ubi->corr_peb_count);
1501 * self_check_eba - run a self check on the EBA table constructed by fastmap.
1502 * @ubi: UBI device description object
1503 * @ai_fastmap: UBI attach info object created by fastmap
1504 * @ai_scan: UBI attach info object created by scanning
1506 * Returns < 0 in case of an internal error, 0 otherwise.
1507 * If a bad EBA table entry was found it will be printed out and
1508 * ubi_assert() triggers.
1510 int self_check_eba(struct ubi_device *ubi, struct ubi_attach_info *ai_fastmap,
1511 struct ubi_attach_info *ai_scan)
1513 int i, j, num_volumes, ret = 0;
1514 int **scan_eba, **fm_eba;
1515 struct ubi_ainf_volume *av;
1516 struct ubi_volume *vol;
1517 struct ubi_ainf_peb *aeb;
1520 num_volumes = ubi->vtbl_slots + UBI_INT_VOL_COUNT;
1522 scan_eba = kmalloc(sizeof(*scan_eba) * num_volumes, GFP_KERNEL);
1526 fm_eba = kmalloc(sizeof(*fm_eba) * num_volumes, GFP_KERNEL);
1532 for (i = 0; i < num_volumes; i++) {
1533 vol = ubi->volumes[i];
1537 scan_eba[i] = kmalloc(vol->reserved_pebs * sizeof(**scan_eba),
1544 fm_eba[i] = kmalloc(vol->reserved_pebs * sizeof(**fm_eba),
1551 for (j = 0; j < vol->reserved_pebs; j++)
1552 scan_eba[i][j] = fm_eba[i][j] = UBI_LEB_UNMAPPED;
1554 av = ubi_find_av(ai_scan, idx2vol_id(ubi, i));
1558 ubi_rb_for_each_entry(rb, aeb, &av->root, u.rb)
1559 scan_eba[i][aeb->lnum] = aeb->pnum;
1561 av = ubi_find_av(ai_fastmap, idx2vol_id(ubi, i));
1565 ubi_rb_for_each_entry(rb, aeb, &av->root, u.rb)
1566 fm_eba[i][aeb->lnum] = aeb->pnum;
1568 for (j = 0; j < vol->reserved_pebs; j++) {
1569 if (scan_eba[i][j] != fm_eba[i][j]) {
1570 if (scan_eba[i][j] == UBI_LEB_UNMAPPED ||
1571 fm_eba[i][j] == UBI_LEB_UNMAPPED)
1574 ubi_err(ubi, "LEB:%i:%i is PEB:%i instead of %i!",
1575 vol->vol_id, j, fm_eba[i][j],
1583 for (i = 0; i < num_volumes; i++) {
1584 if (!ubi->volumes[i])
1597 * ubi_eba_init - initialize the EBA sub-system using attaching information.
1598 * @ubi: UBI device description object
1599 * @ai: attaching information
1601 * This function returns zero in case of success and a negative error code in
1604 int ubi_eba_init(struct ubi_device *ubi, struct ubi_attach_info *ai)
1606 int i, err, num_volumes;
1607 struct ubi_ainf_volume *av;
1608 struct ubi_volume *vol;
1609 struct ubi_ainf_peb *aeb;
1612 dbg_eba("initialize EBA sub-system");
1614 spin_lock_init(&ubi->ltree_lock);
1615 mutex_init(&ubi->alc_mutex);
1616 ubi->ltree = RB_ROOT;
1618 ubi->global_sqnum = ai->max_sqnum + 1;
1619 num_volumes = ubi->vtbl_slots + UBI_INT_VOL_COUNT;
1621 for (i = 0; i < num_volumes; i++) {
1622 struct ubi_eba_table *tbl;
1624 vol = ubi->volumes[i];
1630 tbl = ubi_eba_create_table(vol, vol->reserved_pebs);
1636 ubi_eba_replace_table(vol, tbl);
1638 av = ubi_find_av(ai, idx2vol_id(ubi, i));
1642 ubi_rb_for_each_entry(rb, aeb, &av->root, u.rb) {
1643 if (aeb->lnum >= vol->reserved_pebs) {
1645 * This may happen in case of an unclean reboot
1648 ubi_move_aeb_to_list(av, aeb, &ai->erase);
1650 struct ubi_eba_entry *entry;
1652 entry = &vol->eba_tbl->entries[aeb->lnum];
1653 entry->pnum = aeb->pnum;
1658 if (ubi->avail_pebs < EBA_RESERVED_PEBS) {
1659 ubi_err(ubi, "no enough physical eraseblocks (%d, need %d)",
1660 ubi->avail_pebs, EBA_RESERVED_PEBS);
1661 if (ubi->corr_peb_count)
1662 ubi_err(ubi, "%d PEBs are corrupted and not used",
1663 ubi->corr_peb_count);
1667 ubi->avail_pebs -= EBA_RESERVED_PEBS;
1668 ubi->rsvd_pebs += EBA_RESERVED_PEBS;
1670 if (ubi->bad_allowed) {
1671 ubi_calculate_reserved(ubi);
1673 if (ubi->avail_pebs < ubi->beb_rsvd_level) {
1674 /* No enough free physical eraseblocks */
1675 ubi->beb_rsvd_pebs = ubi->avail_pebs;
1676 print_rsvd_warning(ubi, ai);
1678 ubi->beb_rsvd_pebs = ubi->beb_rsvd_level;
1680 ubi->avail_pebs -= ubi->beb_rsvd_pebs;
1681 ubi->rsvd_pebs += ubi->beb_rsvd_pebs;
1684 dbg_eba("EBA sub-system is initialized");
1688 for (i = 0; i < num_volumes; i++) {
1689 if (!ubi->volumes[i])
1691 ubi_eba_replace_table(ubi->volumes[i], NULL);