2 * Copyright (c) International Business Machines Corp., 2006
3 * Copyright (c) Nokia Corporation, 2006, 2007
5 * SPDX-License-Identifier: GPL-2.0+
7 * Author: Artem Bityutskiy (Битюцкий Артём)
11 * This file includes volume table manipulation code. The volume table is an
12 * on-flash table containing volume meta-data like name, number of reserved
13 * physical eraseblocks, type, etc. The volume table is stored in the so-called
16 * The layout volume is an internal volume which is organized as follows. It
17 * consists of two logical eraseblocks - LEB 0 and LEB 1. Each logical
18 * eraseblock stores one volume table copy, i.e. LEB 0 and LEB 1 duplicate each
19 * other. This redundancy guarantees robustness to unclean reboots. The volume
20 * table is basically an array of volume table records. Each record contains
21 * full information about the volume and protected by a CRC checksum.
23 * The volume table is changed, it is first changed in RAM. Then LEB 0 is
24 * erased, and the updated volume table is written back to LEB 0. Then same for
25 * LEB 1. This scheme guarantees recoverability from unclean reboots.
27 * In this UBI implementation the on-flash volume table does not contain any
28 * information about how much data static volumes contain.
30 * But it would still be beneficial to store this information in the volume
31 * table. For example, suppose we have a static volume X, and all its physical
32 * eraseblocks became bad for some reasons. Suppose we are attaching the
33 * corresponding MTD device, for some reason we find no logical eraseblocks
34 * corresponding to the volume X. According to the volume table volume X does
35 * exist. So we don't know whether it is just empty or all its physical
36 * eraseblocks went bad. So we cannot alarm the user properly.
38 * The volume table also stores so-called "update marker", which is used for
39 * volume updates. Before updating the volume, the update marker is set, and
40 * after the update operation is finished, the update marker is cleared. So if
41 * the update operation was interrupted (e.g. by an unclean reboot) - the
42 * update marker is still there and we know that the volume's contents is
48 #include <linux/crc32.h>
49 #include <linux/err.h>
50 #include <linux/slab.h>
51 #include <asm/div64.h>
53 #include <ubi_uboot.h>
56 #include <linux/err.h>
59 static void self_vtbl_check(const struct ubi_device
*ubi
);
61 /* Empty volume table record */
62 static struct ubi_vtbl_record empty_vtbl_record
;
65 * ubi_change_vtbl_record - change volume table record.
66 * @ubi: UBI device description object
67 * @idx: table index to change
68 * @vtbl_rec: new volume table record
70 * This function changes volume table record @idx. If @vtbl_rec is %NULL, empty
71 * volume table record is written. The caller does not have to calculate CRC of
72 * the record as it is done by this function. Returns zero in case of success
73 * and a negative error code in case of failure.
75 int ubi_change_vtbl_record(struct ubi_device
*ubi
, int idx
,
76 struct ubi_vtbl_record
*vtbl_rec
)
80 struct ubi_volume
*layout_vol
;
82 ubi_assert(idx
>= 0 && idx
< ubi
->vtbl_slots
);
83 layout_vol
= ubi
->volumes
[vol_id2idx(ubi
, UBI_LAYOUT_VOLUME_ID
)];
86 vtbl_rec
= &empty_vtbl_record
;
88 crc
= crc32(UBI_CRC32_INIT
, vtbl_rec
, UBI_VTBL_RECORD_SIZE_CRC
);
89 vtbl_rec
->crc
= cpu_to_be32(crc
);
92 memcpy(&ubi
->vtbl
[idx
], vtbl_rec
, sizeof(struct ubi_vtbl_record
));
93 for (i
= 0; i
< UBI_LAYOUT_VOLUME_EBS
; i
++) {
94 err
= ubi_eba_unmap_leb(ubi
, layout_vol
, i
);
98 err
= ubi_eba_write_leb(ubi
, layout_vol
, i
, ubi
->vtbl
, 0,
104 self_vtbl_check(ubi
);
109 * ubi_vtbl_rename_volumes - rename UBI volumes in the volume table.
110 * @ubi: UBI device description object
111 * @rename_list: list of &struct ubi_rename_entry objects
113 * This function re-names multiple volumes specified in @req in the volume
114 * table. Returns zero in case of success and a negative error code in case of
117 int ubi_vtbl_rename_volumes(struct ubi_device
*ubi
,
118 struct list_head
*rename_list
)
121 struct ubi_rename_entry
*re
;
122 struct ubi_volume
*layout_vol
;
124 list_for_each_entry(re
, rename_list
, list
) {
126 struct ubi_volume
*vol
= re
->desc
->vol
;
127 struct ubi_vtbl_record
*vtbl_rec
= &ubi
->vtbl
[vol
->vol_id
];
130 memcpy(vtbl_rec
, &empty_vtbl_record
,
131 sizeof(struct ubi_vtbl_record
));
135 vtbl_rec
->name_len
= cpu_to_be16(re
->new_name_len
);
136 memcpy(vtbl_rec
->name
, re
->new_name
, re
->new_name_len
);
137 memset(vtbl_rec
->name
+ re
->new_name_len
, 0,
138 UBI_VOL_NAME_MAX
+ 1 - re
->new_name_len
);
139 crc
= crc32(UBI_CRC32_INIT
, vtbl_rec
,
140 UBI_VTBL_RECORD_SIZE_CRC
);
141 vtbl_rec
->crc
= cpu_to_be32(crc
);
144 layout_vol
= ubi
->volumes
[vol_id2idx(ubi
, UBI_LAYOUT_VOLUME_ID
)];
145 for (i
= 0; i
< UBI_LAYOUT_VOLUME_EBS
; i
++) {
146 err
= ubi_eba_unmap_leb(ubi
, layout_vol
, i
);
150 err
= ubi_eba_write_leb(ubi
, layout_vol
, i
, ubi
->vtbl
, 0,
160 * vtbl_check - check if volume table is not corrupted and sensible.
161 * @ubi: UBI device description object
162 * @vtbl: volume table
164 * This function returns zero if @vtbl is all right, %1 if CRC is incorrect,
165 * and %-EINVAL if it contains inconsistent data.
167 static int vtbl_check(const struct ubi_device
*ubi
,
168 const struct ubi_vtbl_record
*vtbl
)
170 int i
, n
, reserved_pebs
, alignment
, data_pad
, vol_type
, name_len
;
175 for (i
= 0; i
< ubi
->vtbl_slots
; i
++) {
178 reserved_pebs
= be32_to_cpu(vtbl
[i
].reserved_pebs
);
179 alignment
= be32_to_cpu(vtbl
[i
].alignment
);
180 data_pad
= be32_to_cpu(vtbl
[i
].data_pad
);
181 upd_marker
= vtbl
[i
].upd_marker
;
182 vol_type
= vtbl
[i
].vol_type
;
183 name_len
= be16_to_cpu(vtbl
[i
].name_len
);
184 name
= &vtbl
[i
].name
[0];
186 crc
= crc32(UBI_CRC32_INIT
, &vtbl
[i
], UBI_VTBL_RECORD_SIZE_CRC
);
187 if (be32_to_cpu(vtbl
[i
].crc
) != crc
) {
188 ubi_err("bad CRC at record %u: %#08x, not %#08x",
189 i
, crc
, be32_to_cpu(vtbl
[i
].crc
));
190 ubi_dump_vtbl_record(&vtbl
[i
], i
);
194 if (reserved_pebs
== 0) {
195 if (memcmp(&vtbl
[i
], &empty_vtbl_record
,
196 UBI_VTBL_RECORD_SIZE
)) {
203 if (reserved_pebs
< 0 || alignment
< 0 || data_pad
< 0 ||
209 if (alignment
> ubi
->leb_size
|| alignment
== 0) {
214 n
= alignment
& (ubi
->min_io_size
- 1);
215 if (alignment
!= 1 && n
) {
220 n
= ubi
->leb_size
% alignment
;
222 ubi_err("bad data_pad, has to be %d", n
);
227 if (vol_type
!= UBI_VID_DYNAMIC
&& vol_type
!= UBI_VID_STATIC
) {
232 if (upd_marker
!= 0 && upd_marker
!= 1) {
237 if (reserved_pebs
> ubi
->good_peb_count
) {
238 ubi_err("too large reserved_pebs %d, good PEBs %d",
239 reserved_pebs
, ubi
->good_peb_count
);
244 if (name_len
> UBI_VOL_NAME_MAX
) {
249 if (name
[0] == '\0') {
254 if (name_len
!= strnlen(name
, name_len
+ 1)) {
260 /* Checks that all names are unique */
261 for (i
= 0; i
< ubi
->vtbl_slots
- 1; i
++) {
262 for (n
= i
+ 1; n
< ubi
->vtbl_slots
; n
++) {
263 int len1
= be16_to_cpu(vtbl
[i
].name_len
);
264 int len2
= be16_to_cpu(vtbl
[n
].name_len
);
266 if (len1
> 0 && len1
== len2
&&
268 !strncmp(vtbl
[i
].name
, vtbl
[n
].name
, len1
)) {
270 !strncmp((char *)vtbl
[i
].name
, vtbl
[n
].name
, len1
)) {
272 ubi_err("volumes %d and %d have the same name \"%s\"",
274 ubi_dump_vtbl_record(&vtbl
[i
], i
);
275 ubi_dump_vtbl_record(&vtbl
[n
], n
);
284 ubi_err("volume table check failed: record %d, error %d", i
, err
);
285 ubi_dump_vtbl_record(&vtbl
[i
], i
);
290 * create_vtbl - create a copy of volume table.
291 * @ubi: UBI device description object
292 * @ai: attaching information
293 * @copy: number of the volume table copy
294 * @vtbl: contents of the volume table
296 * This function returns zero in case of success and a negative error code in
299 static int create_vtbl(struct ubi_device
*ubi
, struct ubi_attach_info
*ai
,
300 int copy
, void *vtbl
)
303 struct ubi_vid_hdr
*vid_hdr
;
304 struct ubi_ainf_peb
*new_aeb
;
306 dbg_gen("create volume table (copy #%d)", copy
+ 1);
308 vid_hdr
= ubi_zalloc_vid_hdr(ubi
, GFP_KERNEL
);
313 new_aeb
= ubi_early_get_peb(ubi
, ai
);
314 if (IS_ERR(new_aeb
)) {
315 err
= PTR_ERR(new_aeb
);
319 vid_hdr
->vol_type
= UBI_LAYOUT_VOLUME_TYPE
;
320 vid_hdr
->vol_id
= cpu_to_be32(UBI_LAYOUT_VOLUME_ID
);
321 vid_hdr
->compat
= UBI_LAYOUT_VOLUME_COMPAT
;
322 vid_hdr
->data_size
= vid_hdr
->used_ebs
=
323 vid_hdr
->data_pad
= cpu_to_be32(0);
324 vid_hdr
->lnum
= cpu_to_be32(copy
);
325 vid_hdr
->sqnum
= cpu_to_be64(++ai
->max_sqnum
);
327 /* The EC header is already there, write the VID header */
328 err
= ubi_io_write_vid_hdr(ubi
, new_aeb
->pnum
, vid_hdr
);
332 /* Write the layout volume contents */
333 err
= ubi_io_write_data(ubi
, vtbl
, new_aeb
->pnum
, 0, ubi
->vtbl_size
);
338 * And add it to the attaching information. Don't delete the old version
339 * of this LEB as it will be deleted and freed in 'ubi_add_to_av()'.
341 err
= ubi_add_to_av(ubi
, ai
, new_aeb
->pnum
, new_aeb
->ec
, vid_hdr
, 0);
342 kmem_cache_free(ai
->aeb_slab_cache
, new_aeb
);
343 ubi_free_vid_hdr(ubi
, vid_hdr
);
347 if (err
== -EIO
&& ++tries
<= 5) {
349 * Probably this physical eraseblock went bad, try to pick
352 list_add(&new_aeb
->u
.list
, &ai
->erase
);
355 kmem_cache_free(ai
->aeb_slab_cache
, new_aeb
);
357 ubi_free_vid_hdr(ubi
, vid_hdr
);
363 * process_lvol - process the layout volume.
364 * @ubi: UBI device description object
365 * @ai: attaching information
366 * @av: layout volume attaching information
368 * This function is responsible for reading the layout volume, ensuring it is
369 * not corrupted, and recovering from corruptions if needed. Returns volume
370 * table in case of success and a negative error code in case of failure.
372 static struct ubi_vtbl_record
*process_lvol(struct ubi_device
*ubi
,
373 struct ubi_attach_info
*ai
,
374 struct ubi_ainf_volume
*av
)
378 struct ubi_ainf_peb
*aeb
;
379 struct ubi_vtbl_record
*leb
[UBI_LAYOUT_VOLUME_EBS
] = { NULL
, NULL
};
380 int leb_corrupted
[UBI_LAYOUT_VOLUME_EBS
] = {1, 1};
383 * UBI goes through the following steps when it changes the layout
386 * b. write new data to LEB 0;
388 * d. write new data to LEB 1.
390 * Before the change, both LEBs contain the same data.
392 * Due to unclean reboots, the contents of LEB 0 may be lost, but there
393 * should LEB 1. So it is OK if LEB 0 is corrupted while LEB 1 is not.
394 * Similarly, LEB 1 may be lost, but there should be LEB 0. And
395 * finally, unclean reboots may result in a situation when neither LEB
396 * 0 nor LEB 1 are corrupted, but they are different. In this case, LEB
397 * 0 contains more recent information.
399 * So the plan is to first check LEB 0. Then
400 * a. if LEB 0 is OK, it must be containing the most recent data; then
401 * we compare it with LEB 1, and if they are different, we copy LEB
403 * b. if LEB 0 is corrupted, but LEB 1 has to be OK, and we copy LEB 1
407 dbg_gen("check layout volume");
409 /* Read both LEB 0 and LEB 1 into memory */
410 ubi_rb_for_each_entry(rb
, aeb
, &av
->root
, u
.rb
) {
411 leb
[aeb
->lnum
] = vzalloc(ubi
->vtbl_size
);
412 if (!leb
[aeb
->lnum
]) {
417 err
= ubi_io_read_data(ubi
, leb
[aeb
->lnum
], aeb
->pnum
, 0,
419 if (err
== UBI_IO_BITFLIPS
|| mtd_is_eccerr(err
))
421 * Scrub the PEB later. Note, -EBADMSG indicates an
422 * uncorrectable ECC error, but we have our own CRC and
423 * the data will be checked later. If the data is OK,
424 * the PEB will be scrubbed (because we set
425 * aeb->scrub). If the data is not OK, the contents of
426 * the PEB will be recovered from the second copy, and
427 * aeb->scrub will be cleared in
437 leb_corrupted
[0] = vtbl_check(ubi
, leb
[0]);
438 if (leb_corrupted
[0] < 0)
442 if (!leb_corrupted
[0]) {
445 leb_corrupted
[1] = memcmp(leb
[0], leb
[1],
447 if (leb_corrupted
[1]) {
448 ubi_warn("volume table copy #2 is corrupted");
449 err
= create_vtbl(ubi
, ai
, 1, leb
[0]);
452 ubi_msg("volume table was restored");
455 /* Both LEB 1 and LEB 2 are OK and consistent */
459 /* LEB 0 is corrupted or does not exist */
461 leb_corrupted
[1] = vtbl_check(ubi
, leb
[1]);
462 if (leb_corrupted
[1] < 0)
465 if (leb_corrupted
[1]) {
466 /* Both LEB 0 and LEB 1 are corrupted */
467 ubi_err("both volume tables are corrupted");
471 ubi_warn("volume table copy #1 is corrupted");
472 err
= create_vtbl(ubi
, ai
, 0, leb
[1]);
475 ubi_msg("volume table was restored");
488 * create_empty_lvol - create empty layout volume.
489 * @ubi: UBI device description object
490 * @ai: attaching information
492 * This function returns volume table contents in case of success and a
493 * negative error code in case of failure.
495 static struct ubi_vtbl_record
*create_empty_lvol(struct ubi_device
*ubi
,
496 struct ubi_attach_info
*ai
)
499 struct ubi_vtbl_record
*vtbl
;
501 vtbl
= vzalloc(ubi
->vtbl_size
);
503 return ERR_PTR(-ENOMEM
);
505 for (i
= 0; i
< ubi
->vtbl_slots
; i
++)
506 memcpy(&vtbl
[i
], &empty_vtbl_record
, UBI_VTBL_RECORD_SIZE
);
508 for (i
= 0; i
< UBI_LAYOUT_VOLUME_EBS
; i
++) {
511 err
= create_vtbl(ubi
, ai
, i
, vtbl
);
522 * init_volumes - initialize volume information for existing volumes.
523 * @ubi: UBI device description object
524 * @ai: scanning information
525 * @vtbl: volume table
527 * This function allocates volume description objects for existing volumes.
528 * Returns zero in case of success and a negative error code in case of
531 static int init_volumes(struct ubi_device
*ubi
,
532 const struct ubi_attach_info
*ai
,
533 const struct ubi_vtbl_record
*vtbl
)
535 int i
, reserved_pebs
= 0;
536 struct ubi_ainf_volume
*av
;
537 struct ubi_volume
*vol
;
539 for (i
= 0; i
< ubi
->vtbl_slots
; i
++) {
542 if (be32_to_cpu(vtbl
[i
].reserved_pebs
) == 0)
543 continue; /* Empty record */
545 vol
= kzalloc(sizeof(struct ubi_volume
), GFP_KERNEL
);
549 vol
->reserved_pebs
= be32_to_cpu(vtbl
[i
].reserved_pebs
);
550 vol
->alignment
= be32_to_cpu(vtbl
[i
].alignment
);
551 vol
->data_pad
= be32_to_cpu(vtbl
[i
].data_pad
);
552 vol
->upd_marker
= vtbl
[i
].upd_marker
;
553 vol
->vol_type
= vtbl
[i
].vol_type
== UBI_VID_DYNAMIC
?
554 UBI_DYNAMIC_VOLUME
: UBI_STATIC_VOLUME
;
555 vol
->name_len
= be16_to_cpu(vtbl
[i
].name_len
);
556 vol
->usable_leb_size
= ubi
->leb_size
- vol
->data_pad
;
557 memcpy(vol
->name
, vtbl
[i
].name
, vol
->name_len
);
558 vol
->name
[vol
->name_len
] = '\0';
561 if (vtbl
[i
].flags
& UBI_VTBL_AUTORESIZE_FLG
) {
562 /* Auto re-size flag may be set only for one volume */
563 if (ubi
->autoresize_vol_id
!= -1) {
564 ubi_err("more than one auto-resize volume (%d and %d)",
565 ubi
->autoresize_vol_id
, i
);
570 ubi
->autoresize_vol_id
= i
;
573 ubi_assert(!ubi
->volumes
[i
]);
574 ubi
->volumes
[i
] = vol
;
577 reserved_pebs
+= vol
->reserved_pebs
;
580 * In case of dynamic volume UBI knows nothing about how many
581 * data is stored there. So assume the whole volume is used.
583 if (vol
->vol_type
== UBI_DYNAMIC_VOLUME
) {
584 vol
->used_ebs
= vol
->reserved_pebs
;
585 vol
->last_eb_bytes
= vol
->usable_leb_size
;
587 (long long)vol
->used_ebs
* vol
->usable_leb_size
;
591 /* Static volumes only */
592 av
= ubi_find_av(ai
, i
);
595 * No eraseblocks belonging to this volume found. We
596 * don't actually know whether this static volume is
597 * completely corrupted or just contains no data. And
598 * we cannot know this as long as data size is not
599 * stored on flash. So we just assume the volume is
600 * empty. FIXME: this should be handled.
605 if (av
->leb_count
!= av
->used_ebs
) {
607 * We found a static volume which misses several
608 * eraseblocks. Treat it as corrupted.
610 ubi_warn("static volume %d misses %d LEBs - corrupted",
611 av
->vol_id
, av
->used_ebs
- av
->leb_count
);
616 vol
->used_ebs
= av
->used_ebs
;
618 (long long)(vol
->used_ebs
- 1) * vol
->usable_leb_size
;
619 vol
->used_bytes
+= av
->last_data_size
;
620 vol
->last_eb_bytes
= av
->last_data_size
;
623 /* And add the layout volume */
624 vol
= kzalloc(sizeof(struct ubi_volume
), GFP_KERNEL
);
628 vol
->reserved_pebs
= UBI_LAYOUT_VOLUME_EBS
;
629 vol
->alignment
= UBI_LAYOUT_VOLUME_ALIGN
;
630 vol
->vol_type
= UBI_DYNAMIC_VOLUME
;
631 vol
->name_len
= sizeof(UBI_LAYOUT_VOLUME_NAME
) - 1;
632 memcpy(vol
->name
, UBI_LAYOUT_VOLUME_NAME
, vol
->name_len
+ 1);
633 vol
->usable_leb_size
= ubi
->leb_size
;
634 vol
->used_ebs
= vol
->reserved_pebs
;
635 vol
->last_eb_bytes
= vol
->reserved_pebs
;
637 (long long)vol
->used_ebs
* (ubi
->leb_size
- vol
->data_pad
);
638 vol
->vol_id
= UBI_LAYOUT_VOLUME_ID
;
641 ubi_assert(!ubi
->volumes
[i
]);
642 ubi
->volumes
[vol_id2idx(ubi
, vol
->vol_id
)] = vol
;
643 reserved_pebs
+= vol
->reserved_pebs
;
647 if (reserved_pebs
> ubi
->avail_pebs
) {
648 ubi_err("not enough PEBs, required %d, available %d",
649 reserved_pebs
, ubi
->avail_pebs
);
650 if (ubi
->corr_peb_count
)
651 ubi_err("%d PEBs are corrupted and not used",
652 ubi
->corr_peb_count
);
654 ubi
->rsvd_pebs
+= reserved_pebs
;
655 ubi
->avail_pebs
-= reserved_pebs
;
661 * check_av - check volume attaching information.
662 * @vol: UBI volume description object
663 * @av: volume attaching information
665 * This function returns zero if the volume attaching information is consistent
666 * to the data read from the volume tabla, and %-EINVAL if not.
668 static int check_av(const struct ubi_volume
*vol
,
669 const struct ubi_ainf_volume
*av
)
673 if (av
->highest_lnum
>= vol
->reserved_pebs
) {
677 if (av
->leb_count
> vol
->reserved_pebs
) {
681 if (av
->vol_type
!= vol
->vol_type
) {
685 if (av
->used_ebs
> vol
->reserved_pebs
) {
689 if (av
->data_pad
!= vol
->data_pad
) {
696 ubi_err("bad attaching information, error %d", err
);
698 ubi_dump_vol_info(vol
);
703 * check_attaching_info - check that attaching information.
704 * @ubi: UBI device description object
705 * @ai: attaching information
707 * Even though we protect on-flash data by CRC checksums, we still don't trust
708 * the media. This function ensures that attaching information is consistent to
709 * the information read from the volume table. Returns zero if the attaching
710 * information is OK and %-EINVAL if it is not.
712 static int check_attaching_info(const struct ubi_device
*ubi
,
713 struct ubi_attach_info
*ai
)
716 struct ubi_ainf_volume
*av
;
717 struct ubi_volume
*vol
;
719 if (ai
->vols_found
> UBI_INT_VOL_COUNT
+ ubi
->vtbl_slots
) {
720 ubi_err("found %d volumes while attaching, maximum is %d + %d",
721 ai
->vols_found
, UBI_INT_VOL_COUNT
, ubi
->vtbl_slots
);
725 if (ai
->highest_vol_id
>= ubi
->vtbl_slots
+ UBI_INT_VOL_COUNT
&&
726 ai
->highest_vol_id
< UBI_INTERNAL_VOL_START
) {
727 ubi_err("too large volume ID %d found", ai
->highest_vol_id
);
731 for (i
= 0; i
< ubi
->vtbl_slots
+ UBI_INT_VOL_COUNT
; i
++) {
734 av
= ubi_find_av(ai
, i
);
735 vol
= ubi
->volumes
[i
];
738 ubi_remove_av(ai
, av
);
742 if (vol
->reserved_pebs
== 0) {
743 ubi_assert(i
< ubi
->vtbl_slots
);
749 * During attaching we found a volume which does not
750 * exist according to the information in the volume
751 * table. This must have happened due to an unclean
752 * reboot while the volume was being removed. Discard
755 ubi_msg("finish volume %d removal", av
->vol_id
);
756 ubi_remove_av(ai
, av
);
758 err
= check_av(vol
, av
);
768 * ubi_read_volume_table - read the volume table.
769 * @ubi: UBI device description object
770 * @ai: attaching information
772 * This function reads volume table, checks it, recover from errors if needed,
773 * or creates it if needed. Returns zero in case of success and a negative
774 * error code in case of failure.
776 int ubi_read_volume_table(struct ubi_device
*ubi
, struct ubi_attach_info
*ai
)
779 struct ubi_ainf_volume
*av
;
781 empty_vtbl_record
.crc
= cpu_to_be32(0xf116c36b);
784 * The number of supported volumes is limited by the eraseblock size
785 * and by the UBI_MAX_VOLUMES constant.
787 ubi
->vtbl_slots
= ubi
->leb_size
/ UBI_VTBL_RECORD_SIZE
;
788 if (ubi
->vtbl_slots
> UBI_MAX_VOLUMES
)
789 ubi
->vtbl_slots
= UBI_MAX_VOLUMES
;
791 ubi
->vtbl_size
= ubi
->vtbl_slots
* UBI_VTBL_RECORD_SIZE
;
792 ubi
->vtbl_size
= ALIGN(ubi
->vtbl_size
, ubi
->min_io_size
);
794 av
= ubi_find_av(ai
, UBI_LAYOUT_VOLUME_ID
);
797 * No logical eraseblocks belonging to the layout volume were
798 * found. This could mean that the flash is just empty. In
799 * this case we create empty layout volume.
801 * But if flash is not empty this must be a corruption or the
802 * MTD device just contains garbage.
805 ubi
->vtbl
= create_empty_lvol(ubi
, ai
);
806 if (IS_ERR(ubi
->vtbl
))
807 return PTR_ERR(ubi
->vtbl
);
809 ubi_err("the layout volume was not found");
813 if (av
->leb_count
> UBI_LAYOUT_VOLUME_EBS
) {
814 /* This must not happen with proper UBI images */
815 ubi_err("too many LEBs (%d) in layout volume",
820 ubi
->vtbl
= process_lvol(ubi
, ai
, av
);
821 if (IS_ERR(ubi
->vtbl
))
822 return PTR_ERR(ubi
->vtbl
);
825 ubi
->avail_pebs
= ubi
->good_peb_count
- ubi
->corr_peb_count
;
828 * The layout volume is OK, initialize the corresponding in-RAM data
831 err
= init_volumes(ubi
, ai
, ubi
->vtbl
);
836 * Make sure that the attaching information is consistent to the
837 * information stored in the volume table.
839 err
= check_attaching_info(ubi
, ai
);
847 for (i
= 0; i
< ubi
->vtbl_slots
+ UBI_INT_VOL_COUNT
; i
++) {
848 kfree(ubi
->volumes
[i
]);
849 ubi
->volumes
[i
] = NULL
;
855 * self_vtbl_check - check volume table.
856 * @ubi: UBI device description object
858 static void self_vtbl_check(const struct ubi_device
*ubi
)
860 if (!ubi_dbg_chk_gen(ubi
))
863 if (vtbl_check(ubi
, ubi
->vtbl
)) {
864 ubi_err("self-check failed");