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Merge branch 'linux-next' of git://git.infradead.org/ubi-2.6 

* 'linux-next' of git://git.infradead.org/ubi-2.6:
  UBI: tighten the corrupted PEB criteria
  UBI: fix check_data_ff return code
  UBI: remember copy_flag while scanning
  UBI: preserve corrupted PEBs
  UBI: add truly corrupted PEBs to corrupted list
  UBI: introduce debugging helper function
  UBI: make check_pattern function non-static
  UBI: do not put eraseblocks to the corrupted list unnecessarily
  UBI: separate out corrupted list
  UBI: change cascade of ifs to switch statements
  UBI: rename a local variable
  UBI: handle bit-flips when no header found
  UBI: remove duplicate IO error codes
  UBI: rename IO error code
  UBI: fix small 80 characters limit style issue
  UBI: cleanup and simplify Kconfig
This commit is contained in:
Linus Torvalds 2010-10-22 16:34:23 -07:00
parent 06d362931a 45aafd3299
commit 4f3a29dada
13 changed files with 422 additions and 289 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

17
drivers/mtd/ubi/Kconfig
View File

@ -1,9 +1,5 @@
menu "UBI - Unsorted block images"
depends on MTD
config MTD_UBI
tristate "Enable UBI"
depends on MTD
menuconfig MTD_UBI
tristate "Enable UBI - Unsorted block images"
select CRC32
help
UBI is a software layer above MTD layer which admits of LVM-like
@ -12,11 +8,12 @@ config MTD_UBI
capabilities. Please, consult the MTD web site for more details
(www.linux-mtd.infradead.org).
if MTD_UBI
config MTD_UBI_WL_THRESHOLD
int "UBI wear-leveling threshold"
default 4096
range 2 65536
depends on MTD_UBI
help
This parameter defines the maximum difference between the highest
erase counter value and the lowest erase counter value of eraseblocks
@ -34,7 +31,6 @@ config MTD_UBI_BEB_RESERVE
int "Percentage of reserved eraseblocks for bad eraseblocks handling"
default 1
range 0 25
depends on MTD_UBI
help
If the MTD device admits of bad eraseblocks (e.g. NAND flash), UBI
reserves some amount of physical eraseblocks to handle new bad
@ -48,8 +44,6 @@ config MTD_UBI_BEB_RESERVE
config MTD_UBI_GLUEBI
tristate "MTD devices emulation driver (gluebi)"
default n
depends on MTD_UBI
help
This option enables gluebi - an additional driver which emulates MTD
devices on top of UBI volumes: for each UBI volumes an MTD device is
@ -59,4 +53,5 @@ config MTD_UBI_GLUEBI
software.
source "drivers/mtd/ubi/Kconfig.debug"
endmenu
endif # MTD_UBI

29
drivers/mtd/ubi/Kconfig.debug
View File

@ -1,94 +1,73 @@
comment "UBI debugging options"
depends on MTD_UBI
config MTD_UBI_DEBUG
bool "UBI debugging"
depends on SYSFS
depends on MTD_UBI
select DEBUG_FS
select KALLSYMS_ALL if KALLSYMS && DEBUG_KERNEL
help
This option enables UBI debugging.
if MTD_UBI_DEBUG
config MTD_UBI_DEBUG_MSG
bool "UBI debugging messages"
depends on MTD_UBI_DEBUG
default n
help
This option enables UBI debugging messages.
config MTD_UBI_DEBUG_PARANOID
bool "Extra self-checks"
default n
depends on MTD_UBI_DEBUG
help
This option enables extra checks in UBI code. Note this slows UBI down
significantly.
config MTD_UBI_DEBUG_DISABLE_BGT
bool "Do not enable the UBI background thread"
depends on MTD_UBI_DEBUG
default n
help
This option switches the background thread off by default. The thread
may be also be enabled/disabled via UBI sysfs.
config MTD_UBI_DEBUG_EMULATE_BITFLIPS
bool "Emulate flash bit-flips"
depends on MTD_UBI_DEBUG
default n
help
This option emulates bit-flips with probability 1/50, which in turn
causes scrubbing. Useful for debugging and stressing UBI.
config MTD_UBI_DEBUG_EMULATE_WRITE_FAILURES
bool "Emulate flash write failures"
depends on MTD_UBI_DEBUG
default n
help
This option emulates write failures with probability 1/100. Useful for
debugging and testing how UBI handlines errors.
config MTD_UBI_DEBUG_EMULATE_ERASE_FAILURES
bool "Emulate flash erase failures"
depends on MTD_UBI_DEBUG
default n
help
This option emulates erase failures with probability 1/100. Useful for
debugging and testing how UBI handlines errors.
menu "Additional UBI debugging messages"
depends on MTD_UBI_DEBUG
comment "Additional UBI debugging messages"
config MTD_UBI_DEBUG_MSG_BLD
bool "Additional UBI initialization and build messages"
default n
depends on MTD_UBI_DEBUG
help
This option enables detailed UBI initialization and device build
debugging messages.
config MTD_UBI_DEBUG_MSG_EBA
bool "Eraseblock association unit messages"
default n
depends on MTD_UBI_DEBUG
help
This option enables debugging messages from the UBI eraseblock
association unit.
config MTD_UBI_DEBUG_MSG_WL
bool "Wear-leveling unit messages"
default n
depends on MTD_UBI_DEBUG
help
This option enables debugging messages from the UBI wear-leveling
unit.
config MTD_UBI_DEBUG_MSG_IO
bool "Input/output unit messages"
default n
depends on MTD_UBI_DEBUG
help
This option enables debugging messages from the UBI input/output unit.
endmenu # UBI debugging messages
endif # MTD_UBI_DEBUG

6
drivers/mtd/ubi/build.c
View File

@ -95,8 +95,8 @@ DEFINE_MUTEX(ubi_devices_mutex);
static DEFINE_SPINLOCK(ubi_devices_lock);
/* "Show" method for files in '/<sysfs>/class/ubi/' */
static ssize_t ubi_version_show(struct class *class, struct class_attribute *attr,
char *buf)
static ssize_t ubi_version_show(struct class *class,
struct class_attribute *attr, char *buf)
{
return sprintf(buf, "%d\n", UBI_VERSION);
}
@ -591,6 +591,7 @@ static int attach_by_scanning(struct ubi_device *ubi)
ubi->bad_peb_count = si->bad_peb_count;
ubi->good_peb_count = ubi->peb_count - ubi->bad_peb_count;
ubi->corr_peb_count = si->corr_peb_count;
ubi->max_ec = si->max_ec;
ubi->mean_ec = si->mean_ec;
ubi_msg("max. sequence number: %llu", si->max_sqnum);
@ -972,6 +973,7 @@ int ubi_attach_mtd_dev(struct mtd_info *mtd, int ubi_num, int vid_hdr_offset)
ubi_msg("MTD device size: %llu MiB", ubi->flash_size >> 20);
ubi_msg("number of good PEBs: %d", ubi->good_peb_count);
ubi_msg("number of bad PEBs: %d", ubi->bad_peb_count);
ubi_msg("number of corrupted PEBs: %d", ubi->corr_peb_count);
ubi_msg("max. allowed volumes: %d", ubi->vtbl_slots);
ubi_msg("wear-leveling threshold: %d", CONFIG_MTD_UBI_WL_THRESHOLD);
ubi_msg("number of internal volumes: %d", UBI_INT_VOL_COUNT);

4
drivers/mtd/ubi/debug.h
View File

@ -57,6 +57,9 @@ void ubi_dbg_dump_seb(const struct ubi_scan_leb *seb, int type);
void ubi_dbg_dump_mkvol_req(const struct ubi_mkvol_req *req);
void ubi_dbg_dump_flash(struct ubi_device *ubi, int pnum, int offset, int len);
#define ubi_dbg_print_hex_dump(l, ps, pt, r, g, b, len, a) \
print_hex_dump(l, ps, pt, r, g, b, len, a)
#ifdef CONFIG_MTD_UBI_DEBUG_MSG
/* General debugging messages */
#define dbg_gen(fmt, ...) dbg_msg(fmt, ##__VA_ARGS__)
@ -172,6 +175,7 @@ static inline int ubi_dbg_is_erase_failure(void)
#define ubi_dbg_dump_seb(seb, type) ({})
#define ubi_dbg_dump_mkvol_req(req) ({})
#define ubi_dbg_dump_flash(ubi, pnum, offset, len) ({})
#define ubi_dbg_print_hex_dump(l, ps, pt, r, g, b, len, a) ({})
#define UBI_IO_DEBUG 0
#define DBG_DISABLE_BGT 0

10
drivers/mtd/ubi/eba.c
View File

@ -418,7 +418,7 @@ retry:
* may try to recover data. FIXME: but this is
* not implemented.
*/
if (err == UBI_IO_BAD_HDR_READ ||
if (err == UBI_IO_BAD_HDR_EBADMSG ||
err == UBI_IO_BAD_HDR) {
ubi_warn("corrupted VID header at PEB "
"%d, LEB %d:%d", pnum, vol_id,
@ -963,7 +963,7 @@ write_error:
static int is_error_sane(int err)
{
if (err == -EIO || err == -ENOMEM || err == UBI_IO_BAD_HDR ||
err == UBI_IO_BAD_HDR_READ || err == -ETIMEDOUT)
err == UBI_IO_BAD_HDR_EBADMSG || err == -ETIMEDOUT)
return 0;
return 1;
}
@ -1201,6 +1201,9 @@ static void print_rsvd_warning(struct ubi_device *ubi,
ubi_warn("cannot reserve enough PEBs for bad PEB handling, reserved %d,"
" need %d", ubi->beb_rsvd_pebs, ubi->beb_rsvd_level);
if (ubi->corr_peb_count)
ubi_warn("%d PEBs are corrupted and not used",
ubi->corr_peb_count);
}
/**
@ -1263,6 +1266,9 @@ int ubi_eba_init_scan(struct ubi_device *ubi, struct ubi_scan_info *si)
if (ubi->avail_pebs < EBA_RESERVED_PEBS) {
ubi_err("no enough physical eraseblocks (%d, need %d)",
ubi->avail_pebs, EBA_RESERVED_PEBS);
if (ubi->corr_peb_count)
ubi_err("%d PEBs are corrupted and not used",
ubi->corr_peb_count);
err = -ENOSPC;
goto out_free;
}

138
drivers/mtd/ubi/io.c
View File

@ -376,25 +376,6 @@ retry:
return 0;
}
/**
* check_pattern - check if buffer contains only a certain byte pattern.
* @buf: buffer to check
* @patt: the pattern to check
* @size: buffer size in bytes
*
* This function returns %1 in there are only @patt bytes in @buf, and %0 if
* something else was also found.
*/
static int check_pattern(const void *buf, uint8_t patt, int size)
{
int i;
for (i = 0; i < size; i++)
if (((const uint8_t *)buf)[i] != patt)
return 0;
return 1;
}
/* Patterns to write to a physical eraseblock when torturing it */
static uint8_t patterns[] = {0xa5, 0x5a, 0x0};
@ -426,7 +407,7 @@ static int torture_peb(struct ubi_device *ubi, int pnum)
if (err)
goto out;
err = check_pattern(ubi->peb_buf1, 0xFF, ubi->peb_size);
err = ubi_check_pattern(ubi->peb_buf1, 0xFF, ubi->peb_size);
if (err == 0) {
ubi_err("erased PEB %d, but a non-0xFF byte found",
pnum);
@ -445,7 +426,8 @@ static int torture_peb(struct ubi_device *ubi, int pnum)
if (err)
goto out;
err = check_pattern(ubi->peb_buf1, patterns[i], ubi->peb_size);
err = ubi_check_pattern(ubi->peb_buf1, patterns[i],
ubi->peb_size);
if (err == 0) {
ubi_err("pattern %x checking failed for PEB %d",
patterns[i], pnum);
@ -517,7 +499,7 @@ static int nor_erase_prepare(struct ubi_device *ubi, int pnum)
* In this case we probably anyway have garbage in this PEB.
*/
err1 = ubi_io_read_vid_hdr(ubi, pnum, &vid_hdr, 0);
if (err1 == UBI_IO_BAD_HDR_READ || err1 == UBI_IO_BAD_HDR)
if (err1 == UBI_IO_BAD_HDR_EBADMSG || err1 == UBI_IO_BAD_HDR)
/*
* The VID header is corrupted, so we can safely erase this
* PEB and not afraid that it will be treated as a valid PEB in
@ -712,47 +694,47 @@ bad:
* and corrected by the flash driver; this is harmless but may indicate that
* this eraseblock may become bad soon (but may be not);
* o %UBI_IO_BAD_HDR if the erase counter header is corrupted (a CRC error);
* o %UBI_IO_PEB_EMPTY if the physical eraseblock is empty;
* o %UBI_IO_BAD_HDR_EBADMSG is the same as %UBI_IO_BAD_HDR, but there also was
* a data integrity error (uncorrectable ECC error in case of NAND);
* o %UBI_IO_FF if only 0xFF bytes were read (the PEB is supposedly empty)
* o a negative error code in case of failure.
*/
int ubi_io_read_ec_hdr(struct ubi_device *ubi, int pnum,
struct ubi_ec_hdr *ec_hdr, int verbose)
{
int err, read_err = 0;
int err, read_err;
uint32_t crc, magic, hdr_crc;
dbg_io("read EC header from PEB %d", pnum);
ubi_assert(pnum >= 0 && pnum < ubi->peb_count);
err = ubi_io_read(ubi, ec_hdr, pnum, 0, UBI_EC_HDR_SIZE);
if (err) {
if (err != UBI_IO_BITFLIPS && err != -EBADMSG)
return err;
read_err = ubi_io_read(ubi, ec_hdr, pnum, 0, UBI_EC_HDR_SIZE);
if (read_err) {
if (read_err != UBI_IO_BITFLIPS && read_err != -EBADMSG)
return read_err;
/*
* We read all the data, but either a correctable bit-flip
* occurred, or MTD reported about some data integrity error,
* like an ECC error in case of NAND. The former is harmless,
* the later may mean that the read data is corrupted. But we
* have a CRC check-sum and we will detect this. If the EC
* header is still OK, we just report this as there was a
* bit-flip.
* occurred, or MTD reported a data integrity error
* (uncorrectable ECC error in case of NAND). The former is
* harmless, the later may mean that the read data is
* corrupted. But we have a CRC check-sum and we will detect
* this. If the EC header is still OK, we just report this as
* there was a bit-flip, to force scrubbing.
*/
if (err == -EBADMSG)
read_err = UBI_IO_BAD_HDR_READ;
}
magic = be32_to_cpu(ec_hdr->magic);
if (magic != UBI_EC_HDR_MAGIC) {
if (read_err)
return read_err;
if (read_err == -EBADMSG)
return UBI_IO_BAD_HDR_EBADMSG;
/*
* The magic field is wrong. Let's check if we have read all
* 0xFF. If yes, this physical eraseblock is assumed to be
* empty.
*/
if (check_pattern(ec_hdr, 0xFF, UBI_EC_HDR_SIZE)) {
if (ubi_check_pattern(ec_hdr, 0xFF, UBI_EC_HDR_SIZE)) {
/* The physical eraseblock is supposedly empty */
if (verbose)
ubi_warn("no EC header found at PEB %d, "
@ -760,7 +742,10 @@ int ubi_io_read_ec_hdr(struct ubi_device *ubi, int pnum,
else if (UBI_IO_DEBUG)
dbg_msg("no EC header found at PEB %d, "
"only 0xFF bytes", pnum);
return UBI_IO_PEB_EMPTY;
if (!read_err)
return UBI_IO_FF;
else
return UBI_IO_FF_BITFLIPS;
}
/*
@ -788,7 +773,11 @@ int ubi_io_read_ec_hdr(struct ubi_device *ubi, int pnum,
} else if (UBI_IO_DEBUG)
dbg_msg("bad EC header CRC at PEB %d, calculated "
"%#08x, read %#08x", pnum, crc, hdr_crc);
return read_err ?: UBI_IO_BAD_HDR;
if (!read_err)
return UBI_IO_BAD_HDR;
else
return UBI_IO_BAD_HDR_EBADMSG;
}
/* And of course validate what has just been read from the media */
@ -975,22 +964,16 @@ bad:
*
* This function reads the volume identifier header from physical eraseblock
* @pnum and stores it in @vid_hdr. It also checks CRC checksum of the read
* volume identifier header. The following codes may be returned:
* volume identifier header. The error codes are the same as in
* 'ubi_io_read_ec_hdr()'.
*
* o %0 if the CRC checksum is correct and the header was successfully read;
* o %UBI_IO_BITFLIPS if the CRC is correct, but bit-flips were detected
* and corrected by the flash driver; this is harmless but may indicate that
* this eraseblock may become bad soon;
* o %UBI_IO_BAD_HDR if the volume identifier header is corrupted (a CRC
* error detected);
* o %UBI_IO_PEB_FREE if the physical eraseblock is free (i.e., there is no VID
* header there);
* o a negative error code in case of failure.
* Note, the implementation of this function is also very similar to
* 'ubi_io_read_ec_hdr()', so refer commentaries in 'ubi_io_read_ec_hdr()'.
*/
int ubi_io_read_vid_hdr(struct ubi_device *ubi, int pnum,
struct ubi_vid_hdr *vid_hdr, int verbose)
{
int err, read_err = 0;
int err, read_err;
uint32_t crc, magic, hdr_crc;
void *p;
@ -998,48 +981,29 @@ int ubi_io_read_vid_hdr(struct ubi_device *ubi, int pnum,
ubi_assert(pnum >= 0 && pnum < ubi->peb_count);
p = (char *)vid_hdr - ubi->vid_hdr_shift;
err = ubi_io_read(ubi, p, pnum, ubi->vid_hdr_aloffset,
read_err = ubi_io_read(ubi, p, pnum, ubi->vid_hdr_aloffset,
ubi->vid_hdr_alsize);
if (err) {
if (err != UBI_IO_BITFLIPS && err != -EBADMSG)
return err;
/*
* We read all the data, but either a correctable bit-flip
* occurred, or MTD reported about some data integrity error,
* like an ECC error in case of NAND. The former is harmless,
* the later may mean the read data is corrupted. But we have a
* CRC check-sum and we will identify this. If the VID header is
* still OK, we just report this as there was a bit-flip.
*/
if (err == -EBADMSG)
read_err = UBI_IO_BAD_HDR_READ;
}
if (read_err && read_err != UBI_IO_BITFLIPS && read_err != -EBADMSG)
return read_err;
magic = be32_to_cpu(vid_hdr->magic);
if (magic != UBI_VID_HDR_MAGIC) {
if (read_err)
return read_err;
if (read_err == -EBADMSG)
return UBI_IO_BAD_HDR_EBADMSG;
/*
* If we have read all 0xFF bytes, the VID header probably does
* not exist and the physical eraseblock is assumed to be free.
*/
if (check_pattern(vid_hdr, 0xFF, UBI_VID_HDR_SIZE)) {
/* The physical eraseblock is supposedly free */
if (ubi_check_pattern(vid_hdr, 0xFF, UBI_VID_HDR_SIZE)) {
if (verbose)
ubi_warn("no VID header found at PEB %d, "
"only 0xFF bytes", pnum);
else if (UBI_IO_DEBUG)
dbg_msg("no VID header found at PEB %d, "
"only 0xFF bytes", pnum);
return UBI_IO_PEB_FREE;
if (!read_err)
return UBI_IO_FF;
else
return UBI_IO_FF_BITFLIPS;
}
/*
* This is not a valid VID header, and these are not 0xFF
* bytes. Report that the header is corrupted.
*/
if (verbose) {
ubi_warn("bad magic number at PEB %d: %08x instead of "
"%08x", pnum, magic, UBI_VID_HDR_MAGIC);
@ -1061,20 +1025,18 @@ int ubi_io_read_vid_hdr(struct ubi_device *ubi, int pnum,
} else if (UBI_IO_DEBUG)
dbg_msg("bad CRC at PEB %d, calculated %#08x, "
"read %#08x", pnum, crc, hdr_crc);
return read_err ?: UBI_IO_BAD_HDR;
if (!read_err)
return UBI_IO_BAD_HDR;
else
return UBI_IO_BAD_HDR_EBADMSG;
}
/* Validate the VID header that we have just read */
err = validate_vid_hdr(ubi, vid_hdr);
if (err) {
ubi_err("validation failed for PEB %d", pnum);
return -EINVAL;
}
/*
* If there was a read error (%-EBADMSG), but the header CRC is still
* OK, report about a bit-flip to force scrubbing on this PEB.
*/
return read_err ? UBI_IO_BITFLIPS : 0;
}
@ -1383,7 +1345,7 @@ int ubi_dbg_check_all_ff(struct ubi_device *ubi, int pnum, int offset, int len)
goto error;
}
err = check_pattern(ubi->dbg_peb_buf, 0xFF, len);
err = ubi_check_pattern(ubi->dbg_peb_buf, 0xFF, len);
if (err == 0) {
ubi_err("flash region at PEB %d:%d, length %d does not "
"contain all 0xFF bytes", pnum, offset, len);

19
drivers/mtd/ubi/misc.c
View File

@ -103,3 +103,22 @@ void ubi_calculate_reserved(struct ubi_device *ubi)
if (ubi->beb_rsvd_level < MIN_RESEVED_PEBS)
ubi->beb_rsvd_level = MIN_RESEVED_PEBS;
}
/**
* ubi_check_pattern - check if buffer contains only a certain byte pattern.
* @buf: buffer to check
* @patt: the pattern to check
* @size: buffer size in bytes
*
* This function returns %1 in there are only @patt bytes in @buf, and %0 if
* something else was also found.
*/
int ubi_check_pattern(const void *buf, uint8_t patt, int size)
{
int i;
for (i = 0; i < size; i++)
if (((const uint8_t *)buf)[i] != patt)
return 0;
return 1;
}

393
drivers/mtd/ubi/scan.c
View File

@ -29,7 +29,7 @@
* objects which are kept in volume RB-tree with root at the @volumes field.
* The RB-tree is indexed by the volume ID.
*
* Found logical eraseblocks are represented by &struct ubi_scan_leb objects.
* Scanned logical eraseblocks are represented by &struct ubi_scan_leb objects.
* These objects are kept in per-volume RB-trees with the root at the
* corresponding &struct ubi_scan_volume object. To put it differently, we keep
* an RB-tree of per-volume objects and each of these objects is the root of
@ -38,6 +38,33 @@
* Corrupted physical eraseblocks are put to the @corr list, free physical
* eraseblocks are put to the @free list and the physical eraseblock to be
* erased are put to the @erase list.
*
* UBI tries to distinguish between 2 types of corruptions.
* 1. Corruptions caused by power cuts. These are harmless and expected
* corruptions and UBI tries to handle them gracefully, without printing too
* many warnings and error messages. The idea is that we do not lose
* important data in these case - we may lose only the data which was being
* written to the media just before the power cut happened, and the upper
* layers (e.g., UBIFS) are supposed to handle these situations. UBI puts
* these PEBs to the head of the @erase list and they are scheduled for
* erasure.
*
* 2. Unexpected corruptions which are not caused by power cuts. During
* scanning, such PEBs are put to the @corr list and UBI preserves them.
* Obviously, this lessens the amount of available PEBs, and if at some
* point UBI runs out of free PEBs, it switches to R/O mode. UBI also loudly
* informs about such PEBs every time the MTD device is attached.
*
* However, it is difficult to reliably distinguish between these types of
* corruptions and UBI's strategy is as follows. UBI assumes (2.) if the VID
* header is corrupted and the data area does not contain all 0xFFs, and there
* were not bit-flips or integrity errors while reading the data area. Otherwise
* UBI assumes (1.). The assumptions are:
* o if the data area contains only 0xFFs, there is no data, and it is safe
* to just erase this PEB.
* o if the data area has bit-flips and data integrity errors (ECC errors on
* NAND), it is probably a PEB which was being erased when power cut
* happened.
*/
#include <linux/err.h>
@ -62,26 +89,26 @@ static struct ubi_vid_hdr *vidh;
* @si: scanning information
* @pnum: physical eraseblock number to add
* @ec: erase counter of the physical eraseblock
* @to_head: if not zero, add to the head of the list
* @list: the list to add to
*
* This function adds physical eraseblock @pnum to free, erase, corrupted or
* alien lists. Returns zero in case of success and a negative error code in
* case of failure.
* This function adds physical eraseblock @pnum to free, erase, or alien lists.
* If @to_head is not zero, PEB will be added to the head of the list, which
* basically means it will be processed first later. E.g., we add corrupted
* PEBs (corrupted due to power cuts) to the head of the erase list to make
* sure we erase them first and get rid of corruptions ASAP. This function
* returns zero in case of success and a negative error code in case of
* failure.
*/
static int add_to_list(struct ubi_scan_info *si, int pnum, int ec,
static int add_to_list(struct ubi_scan_info *si, int pnum, int ec, int to_head,
struct list_head *list)
{
struct ubi_scan_leb *seb;
if (list == &si->free) {
dbg_bld("add to free: PEB %d, EC %d", pnum, ec);
si->free_peb_count += 1;
} else if (list == &si->erase) {
dbg_bld("add to erase: PEB %d, EC %d", pnum, ec);
si->erase_peb_count += 1;
} else if (list == &si->corr) {
dbg_bld("add to corrupted: PEB %d, EC %d", pnum, ec);
si->corr_peb_count += 1;
} else if (list == &si->alien) {
dbg_bld("add to alien: PEB %d, EC %d", pnum, ec);
si->alien_peb_count += 1;
@ -94,7 +121,37 @@ static int add_to_list(struct ubi_scan_info *si, int pnum, int ec,
seb->pnum = pnum;
seb->ec = ec;
list_add_tail(&seb->u.list, list);
if (to_head)
list_add(&seb->u.list, list);
else
list_add_tail(&seb->u.list, list);
return 0;
}
/**
* add_corrupted - add a corrupted physical eraseblock.
* @si: scanning information
* @pnum: physical eraseblock number to add
* @ec: erase counter of the physical eraseblock
*
* This function adds corrupted physical eraseblock @pnum to the 'corr' list.
* The corruption was presumably not caused by a power cut. Returns zero in
* case of success and a negative error code in case of failure.
*/
static int add_corrupted(struct ubi_scan_info *si, int pnum, int ec)
{
struct ubi_scan_leb *seb;
dbg_bld("add to corrupted: PEB %d, EC %d", pnum, ec);
seb = kmalloc(sizeof(struct ubi_scan_leb), GFP_KERNEL);
if (!seb)
return -ENOMEM;
si->corr_peb_count += 1;
seb->pnum = pnum;
seb->ec = ec;
list_add(&seb->u.list, &si->corr);
return 0;
}
@ -258,8 +315,8 @@ static int compare_lebs(struct ubi_device *ubi, const struct ubi_scan_leb *seb,
* created before sequence numbers support has been added. At
* that times we used 32-bit LEB versions stored in logical
* eraseblocks. That was before UBI got into mainline. We do not
* support these images anymore. Well, those images will work
* still work, but only if no unclean reboots happened.
* support these images anymore. Well, those images still work,
* but only if no unclean reboots happened.
*/
ubi_err("unsupported on-flash UBI format\n");
return -EINVAL;
@ -285,19 +342,25 @@ static int compare_lebs(struct ubi_device *ubi, const struct ubi_scan_leb *seb,
return 1;
}
} else {
pnum = seb->pnum;
if (!seb->copy_flag) {
/* It is not a copy, so it is newer */
dbg_bld("first PEB %d is newer, copy_flag is unset",
pnum);
return bitflips << 1;
}
vh = ubi_zalloc_vid_hdr(ubi, GFP_KERNEL);
if (!vh)
return -ENOMEM;
pnum = seb->pnum;
err = ubi_io_read_vid_hdr(ubi, pnum, vh, 0);
if (err) {
if (err == UBI_IO_BITFLIPS)
bitflips = 1;
else {
dbg_err("VID of PEB %d header is bad, but it "
"was OK earlier", pnum);
"was OK earlier, err %d", pnum, err);
if (err > 0)
err = -EIO;
@ -305,14 +368,6 @@ static int compare_lebs(struct ubi_device *ubi, const struct ubi_scan_leb *seb,
}
}
if (!vh->copy_flag) {
/* It is not a copy, so it is newer */
dbg_bld("first PEB %d is newer, copy_flag is unset",
pnum);
err = bitflips << 1;
goto out_free_vidh;
}
vid_hdr = vh;
}
@ -463,18 +518,15 @@ int ubi_scan_add_used(struct ubi_device *ubi, struct ubi_scan_info *si,
if (err)
return err;
if (cmp_res & 4)
err = add_to_list(si, seb->pnum, seb->ec,
&si->corr);
else
err = add_to_list(si, seb->pnum, seb->ec,
&si->erase);
err = add_to_list(si, seb->pnum, seb->ec, cmp_res & 4,
&si->erase);
if (err)
return err;
seb->ec = ec;
seb->pnum = pnum;
seb->scrub = ((cmp_res & 2) || bitflips);
seb->copy_flag = vid_hdr->copy_flag;
seb->sqnum = sqnum;
if (sv->highest_lnum == lnum)
@ -487,10 +539,8 @@ int ubi_scan_add_used(struct ubi_device *ubi, struct ubi_scan_info *si,
* This logical eraseblock is older than the one found
* previously.
*/
if (cmp_res & 4)
return add_to_list(si, pnum, ec, &si->corr);
else
return add_to_list(si, pnum, ec, &si->erase);
return add_to_list(si, pnum, ec, cmp_res & 4,
&si->erase);
}
}
@ -510,8 +560,9 @@ int ubi_scan_add_used(struct ubi_device *ubi, struct ubi_scan_info *si,
seb->ec = ec;
seb->pnum = pnum;
seb->lnum = lnum;
seb->sqnum = sqnum;
seb->scrub = bitflips;
seb->copy_flag = vid_hdr->copy_flag;
seb->sqnum = sqnum;
if (sv->highest_lnum <= lnum) {
sv->highest_lnum = lnum;
@ -521,7 +572,6 @@ int ubi_scan_add_used(struct ubi_device *ubi, struct ubi_scan_info *si,
sv->leb_count += 1;
rb_link_node(&seb->u.rb, parent, p);
rb_insert_color(&seb->u.rb, &sv->root);
si->used_peb_count += 1;
return 0;
}
@ -668,8 +718,8 @@ out_free:
struct ubi_scan_leb *ubi_scan_get_free_peb(struct ubi_device *ubi,
struct ubi_scan_info *si)
{
int err = 0, i;
struct ubi_scan_leb *seb;
int err = 0;
struct ubi_scan_leb *seb, *tmp_seb;
if (!list_empty(&si->free)) {
seb = list_entry(si->free.next, struct ubi_scan_leb, u.list);
@ -678,40 +728,88 @@ struct ubi_scan_leb *ubi_scan_get_free_peb(struct ubi_device *ubi,
return seb;
}
for (i = 0; i < 2; i++) {
struct list_head *head;
struct ubi_scan_leb *tmp_seb;
/*
* We try to erase the first physical eraseblock from the erase list
* and pick it if we succeed, or try to erase the next one if not. And
* so forth. We don't want to take care about bad eraseblocks here -
* they'll be handled later.
*/
list_for_each_entry_safe(seb, tmp_seb, &si->erase, u.list) {
if (seb->ec == UBI_SCAN_UNKNOWN_EC)
seb->ec = si->mean_ec;
if (i == 0)
head = &si->erase;
else
head = &si->corr;
err = ubi_scan_erase_peb(ubi, si, seb->pnum, seb->ec+1);
if (err)
continue;
/*
* We try to erase the first physical eraseblock from the @head
* list and pick it if we succeed, or try to erase the
* next one if not. And so forth. We don't want to take care
* about bad eraseblocks here - they'll be handled later.
*/
list_for_each_entry_safe(seb, tmp_seb, head, u.list) {
if (seb->ec == UBI_SCAN_UNKNOWN_EC)
seb->ec = si->mean_ec;
err = ubi_scan_erase_peb(ubi, si, seb->pnum, seb->ec+1);
if (err)
continue;
seb->ec += 1;
list_del(&seb->u.list);
dbg_bld("return PEB %d, EC %d", seb->pnum, seb->ec);
return seb;
}
seb->ec += 1;
list_del(&seb->u.list);
dbg_bld("return PEB %d, EC %d", seb->pnum, seb->ec);
return seb;
}
ubi_err("no eraseblocks found");
ubi_err("no free eraseblocks");
return ERR_PTR(-ENOSPC);
}
/**
* check_corruption - check the data area of PEB.
* @ubi: UBI device description object
* @vid_hrd: the (corrupted) VID header of this PEB
* @pnum: the physical eraseblock number to check
*
* This is a helper function which is used to distinguish between VID header
* corruptions caused by power cuts and other reasons. If the PEB contains only
* 0xFF bytes in the data area, the VID header is most probably corrupted
* because of a power cut (%0 is returned in this case). Otherwise, it was
* probably corrupted for some other reasons (%1 is returned in this case). A
* negative error code is returned if a read error occurred.
*
* If the corruption reason was a power cut, UBI can safely erase this PEB.
* Otherwise, it should preserve it to avoid possibly destroying important
* information.
*/
static int check_corruption(struct ubi_device *ubi, struct ubi_vid_hdr *vid_hdr,
int pnum)
{
int err;
mutex_lock(&ubi->buf_mutex);
memset(ubi->peb_buf1, 0x00, ubi->leb_size);
err = ubi_io_read(ubi, ubi->peb_buf1, pnum, ubi->leb_start,
ubi->leb_size);
if (err == UBI_IO_BITFLIPS || err == -EBADMSG) {
/*
* Bit-flips or integrity errors while reading the data area.
* It is difficult to say for sure what type of corruption is
* this, but presumably a power cut happened while this PEB was
* erased, so it became unstable and corrupted, and should be
* erased.
*/
return 0;
}
if (err)
return err;
if (ubi_check_pattern(ubi->peb_buf1, 0xFF, ubi->leb_size)) {
mutex_unlock(&ubi->buf_mutex);
return 0;
}
ubi_err("PEB %d contains corrupted VID header, and the data does not "
"contain all 0xFF, this may be a non-UBI PEB or a severe VID "
"header corruption which requires manual inspection", pnum);
ubi_dbg_dump_vid_hdr(vid_hdr);
dbg_msg("hexdump of PEB %d offset %d, length %d",
pnum, ubi->leb_start, ubi->leb_size);
ubi_dbg_print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_OFFSET, 32, 1,
ubi->peb_buf1, ubi->leb_size, 1);
mutex_unlock(&ubi->buf_mutex);
return 1;
}
/**
* process_eb - read, check UBI headers, and add them to scanning information.
* @ubi: UBI device description object
@ -725,7 +823,7 @@ static int process_eb(struct ubi_device *ubi, struct ubi_scan_info *si,
int pnum)
{
long long uninitialized_var(ec);
int err, bitflips = 0, vol_id, ec_corr = 0;
int err, bitflips = 0, vol_id, ec_err = 0;
dbg_bld("scan PEB %d", pnum);
@ -746,22 +844,37 @@ static int process_eb(struct ubi_device *ubi, struct ubi_scan_info *si,
err = ubi_io_read_ec_hdr(ubi, pnum, ech, 0);
if (err < 0)
return err;
else if (err == UBI_IO_BITFLIPS)
switch (err) {
case 0:
break;
case UBI_IO_BITFLIPS:
bitflips = 1;
else if (err == UBI_IO_PEB_EMPTY)
return add_to_list(si, pnum, UBI_SCAN_UNKNOWN_EC, &si->erase);
else if (err == UBI_IO_BAD_HDR_READ || err == UBI_IO_BAD_HDR) {
break;
case UBI_IO_FF:
si->empty_peb_count += 1;
return add_to_list(si, pnum, UBI_SCAN_UNKNOWN_EC, 0,
&si->erase);
case UBI_IO_FF_BITFLIPS:
si->empty_peb_count += 1;
return add_to_list(si, pnum, UBI_SCAN_UNKNOWN_EC, 1,
&si->erase);
case UBI_IO_BAD_HDR_EBADMSG:
case UBI_IO_BAD_HDR:
/*
* We have to also look at the VID header, possibly it is not
* corrupted. Set %bitflips flag in order to make this PEB be
* moved and EC be re-created.
*/
ec_corr = err;
ec_err = err;
ec = UBI_SCAN_UNKNOWN_EC;
bitflips = 1;
break;
default:
ubi_err("'ubi_io_read_ec_hdr()' returned unknown code %d", err);
return -EINVAL;
}
if (!ec_corr) {
if (!ec_err) {
int image_seq;
/* Make sure UBI version is OK */
@ -814,24 +927,67 @@ static int process_eb(struct ubi_device *ubi, struct ubi_scan_info *si,
err = ubi_io_read_vid_hdr(ubi, pnum, vidh, 0);
if (err < 0)
return err;
else if (err == UBI_IO_BITFLIPS)
switch (err) {
case 0:
break;
case UBI_IO_BITFLIPS:
bitflips = 1;
else if (err == UBI_IO_BAD_HDR_READ || err == UBI_IO_BAD_HDR ||
(err == UBI_IO_PEB_FREE && ec_corr)) {
/* VID header is corrupted */
if (err == UBI_IO_BAD_HDR_READ ||
ec_corr == UBI_IO_BAD_HDR_READ)
si->read_err_count += 1;
err = add_to_list(si, pnum, ec, &si->corr);
break;
case UBI_IO_BAD_HDR_EBADMSG:
if (ec_err == UBI_IO_BAD_HDR_EBADMSG)
/*
* Both EC and VID headers are corrupted and were read
* with data integrity error, probably this is a bad
* PEB, bit it is not marked as bad yet. This may also
* be a result of power cut during erasure.
*/
si->maybe_bad_peb_count += 1;
case UBI_IO_BAD_HDR:
if (ec_err)
/*
* Both headers are corrupted. There is a possibility
* that this a valid UBI PEB which has corresponding
* LEB, but the headers are corrupted. However, it is
* impossible to distinguish it from a PEB which just
* contains garbage because of a power cut during erase
* operation. So we just schedule this PEB for erasure.
*/
err = 0;
else
/*
* The EC was OK, but the VID header is corrupted. We
* have to check what is in the data area.
*/
err = check_corruption(ubi, vidh, pnum);
if (err < 0)
return err;
else if (!err)
/* This corruption is caused by a power cut */
err = add_to_list(si, pnum, ec, 1, &si->erase);
else
/* This is an unexpected corruption */
err = add_corrupted(si, pnum, ec);
if (err)
return err;
goto adjust_mean_ec;
} else if (err == UBI_IO_PEB_FREE) {
/* No VID header - the physical eraseblock is free */
err = add_to_list(si, pnum, ec, &si->free);
case UBI_IO_FF_BITFLIPS:
err = add_to_list(si, pnum, ec, 1, &si->erase);
if (err)
return err;
goto adjust_mean_ec;
case UBI_IO_FF:
if (ec_err)
err = add_to_list(si, pnum, ec, 1, &si->erase);
else
err = add_to_list(si, pnum, ec, 0, &si->free);
if (err)
return err;
goto adjust_mean_ec;
default:
ubi_err("'ubi_io_read_vid_hdr()' returned unknown code %d",
err);
return -EINVAL;
}
vol_id = be32_to_cpu(vidh->vol_id);
@ -843,7 +999,7 @@ static int process_eb(struct ubi_device *ubi, struct ubi_scan_info *si,
case UBI_COMPAT_DELETE:
ubi_msg("\"delete\" compatible internal volume %d:%d"
" found, will remove it", vol_id, lnum);
err = add_to_list(si, pnum, ec, &si->erase);
err = add_to_list(si, pnum, ec, 1, &si->erase);
if (err)
return err;
return 0;
@ -858,7 +1014,7 @@ static int process_eb(struct ubi_device *ubi, struct ubi_scan_info *si,
case UBI_COMPAT_PRESERVE:
ubi_msg("\"preserve\" compatible internal volume %d:%d"
" found", vol_id, lnum);
err = add_to_list(si, pnum, ec, &si->alien);
err = add_to_list(si, pnum, ec, 0, &si->alien);
if (err)
return err;
return 0;
@ -870,7 +1026,7 @@ static int process_eb(struct ubi_device *ubi, struct ubi_scan_info *si,
}
}
if (ec_corr)
if (ec_err)
ubi_warn("valid VID header but corrupted EC header at PEB %d",
pnum);
err = ubi_scan_add_used(ubi, si, pnum, ec, vidh, bitflips);
@ -878,7 +1034,7 @@ static int process_eb(struct ubi_device *ubi, struct ubi_scan_info *si,
return err;
adjust_mean_ec:
if (!ec_corr) {
if (!ec_err) {
si->ec_sum += ec;
si->ec_count += 1;
if (ec > si->max_ec)
@ -904,19 +1060,20 @@ adjust_mean_ec:
static int check_what_we_have(struct ubi_device *ubi, struct ubi_scan_info *si)
{
struct ubi_scan_leb *seb;
int max_corr;
int max_corr, peb_count;
max_corr = ubi->peb_count - si->bad_peb_count - si->alien_peb_count;
max_corr = max_corr / 20 ?: 8;
peb_count = ubi->peb_count - si->bad_peb_count - si->alien_peb_count;
max_corr = peb_count / 20 ?: 8;
/*
* Few corrupted PEBs are not a problem and may be just a result of
* Few corrupted PEBs is not a problem and may be just a result of
* unclean reboots. However, many of them may indicate some problems
* with the flash HW or driver.
*/
if (si->corr_peb_count >= 8) {
ubi_warn("%d PEBs are corrupted", si->corr_peb_count);
printk(KERN_WARNING "corrupted PEBs are:");
if (si->corr_peb_count) {
ubi_err("%d PEBs are corrupted and preserved",
si->corr_peb_count);
printk(KERN_ERR "Corrupted PEBs are:");
list_for_each_entry(seb, &si->corr, u.list)
printk(KERN_CONT " %d", seb->pnum);
printk(KERN_CONT "\n");
@ -931,41 +1088,35 @@ static int check_what_we_have(struct ubi_device *ubi, struct ubi_scan_info *si)
}
}
if (si->free_peb_count + si->used_peb_count +
si->alien_peb_count == 0) {
/* No UBI-formatted eraseblocks were found */
if (si->corr_peb_count == si->read_err_count &&
si->corr_peb_count < 8) {
/* No or just few corrupted PEBs, and all of them had a
* read error. We assume that those are bad PEBs, which
* were just not marked as bad so far.
*
* This piece of code basically tries to distinguish
* between the following 2 situations:
*
* 1. Flash is empty, but there are few bad PEBs, which
* are not marked as bad so far, and which were read
* with error. We want to go ahead and format this
* flash. While formating, the faulty PEBs will
* probably be marked as bad.
*
* 2. Flash probably contains non-UBI data and we do
* not want to format it and destroy possibly needed
* data (e.g., consider the case when the bootloader
* MTD partition was accidentally fed to UBI).
*/
if (si->empty_peb_count + si->maybe_bad_peb_count == peb_count) {
/*
* All PEBs are empty, or almost all - a couple PEBs look like
* they may be bad PEBs which were not marked as bad yet.
*
* This piece of code basically tries to distinguish between
* the following situations:
*
* 1. Flash is empty, but there are few bad PEBs, which are not
* marked as bad so far, and which were read with error. We
* want to go ahead and format this flash. While formatting,
* the faulty PEBs will probably be marked as bad.
*
* 2. Flash contains non-UBI data and we do not want to format
* it and destroy possibly important information.
*/
if (si->maybe_bad_peb_count <= 2) {
si->is_empty = 1;
ubi_msg("empty MTD device detected");
get_random_bytes(&ubi->image_seq, sizeof(ubi->image_seq));
get_random_bytes(&ubi->image_seq,
sizeof(ubi->image_seq));
} else {
ubi_err("MTD device possibly contains non-UBI data, "
"refusing it");
ubi_err("MTD device is not UBI-formatted and possibly "
"contains non-UBI data - refusing it");
return -EINVAL;
}
}
if (si->corr_peb_count > 0)
ubi_msg("corrupted PEBs will be formatted");
return 0;
}

19
drivers/mtd/ubi/scan.h
View File

@ -30,6 +30,7 @@
* @pnum: physical eraseblock number
* @lnum: logical eraseblock number
* @scrub: if this physical eraseblock needs scrubbing
* @copy_flag: this LEB is a copy (@copy_flag is set in VID header of this LEB)
* @sqnum: sequence number
* @u: unions RB-tree or @list links
* @u.rb: link in the per-volume RB-tree of &struct ubi_scan_leb objects
@ -42,7 +43,8 @@ struct ubi_scan_leb {
int ec;
int pnum;
int lnum;
int scrub;
unsigned int scrub:1;
unsigned int copy_flag:1;
unsigned long long sqnum;
union {
struct rb_node rb;
@ -91,14 +93,13 @@ struct ubi_scan_volume {
* @erase: list of physical eraseblocks which have to be erased
* @alien: list of physical eraseblocks which should not be used by UBI (e.g.,
* those belonging to "preserve"-compatible internal volumes)
* @used_peb_count: count of used PEBs
* @corr_peb_count: count of PEBs in the @corr list
* @read_err_count: count of PEBs read with error (%UBI_IO_BAD_HDR_READ was
* returned)
* @free_peb_count: count of PEBs in the @free list
* @erase_peb_count: count of PEBs in the @erase list
* @empty_peb_count: count of PEBs which are presumably empty (contain only
* 0xFF bytes)
* @alien_peb_count: count of PEBs in the @alien list
* @bad_peb_count: count of bad physical eraseblocks
* @maybe_bad_peb_count: count of bad physical eraseblocks which are not marked
* as bad yet, but which look like bad
* @vols_found: number of volumes found during scanning
* @highest_vol_id: highest volume ID
* @is_empty: flag indicating whether the MTD device is empty or not
@ -119,13 +120,11 @@ struct ubi_scan_info {
struct list_head free;
struct list_head erase;
struct list_head alien;
int used_peb_count;
int corr_peb_count;
int read_err_count;
int free_peb_count;
int erase_peb_count;
int empty_peb_count;
int alien_peb_count;
int bad_peb_count;
int maybe_bad_peb_count;
int vols_found;
int highest_vol_id;
int is_empty;

29
drivers/mtd/ubi/ubi.h
View File

@ -85,21 +85,26 @@
/*
* Error codes returned by the I/O sub-system.
*
* UBI_IO_PEB_EMPTY: the physical eraseblock is empty, i.e. it contains only
* %0xFF bytes
* UBI_IO_PEB_FREE: the physical eraseblock is free, i.e. it contains only a
* valid erase counter header, and the rest are %0xFF bytes
* UBI_IO_FF: the read region of flash contains only 0xFFs
* UBI_IO_FF_BITFLIPS: the same as %UBI_IO_FF, but also also there was a data
* integrity error reported by the MTD driver
* (uncorrectable ECC error in case of NAND)
* UBI_IO_BAD_HDR: the EC or VID header is corrupted (bad magic or CRC)
* UBI_IO_BAD_HDR_READ: the same as %UBI_IO_BAD_HDR, but also there was a read
* error reported by the flash driver
* UBI_IO_BAD_HDR_EBADMSG: the same as %UBI_IO_BAD_HDR, but also there was a
* data integrity error reported by the MTD driver
* (uncorrectable ECC error in case of NAND)
* UBI_IO_BITFLIPS: bit-flips were detected and corrected
*
* Note, it is probably better to have bit-flip and ebadmsg as flags which can
* be or'ed with other error code. But this is a big change because there are
* may callers, so it does not worth the risk of introducing a bug
*/
enum {
UBI_IO_PEB_EMPTY = 1,
UBI_IO_PEB_FREE,
UBI_IO_FF = 1,
UBI_IO_FF_BITFLIPS,
UBI_IO_BAD_HDR,
UBI_IO_BAD_HDR_READ,
UBI_IO_BITFLIPS
UBI_IO_BAD_HDR_EBADMSG,
UBI_IO_BITFLIPS,
};
/*
@ -356,6 +361,8 @@ struct ubi_wl_entry;
* @peb_size: physical eraseblock size
* @bad_peb_count: count of bad physical eraseblocks
* @good_peb_count: count of good physical eraseblocks
* @corr_peb_count: count of corrupted physical eraseblocks (preserved and not
* used by UBI)
* @erroneous_peb_count: count of erroneous physical eraseblocks in @erroneous
* @max_erroneous: maximum allowed amount of erroneous physical eraseblocks
* @min_io_size: minimal input/output unit size of the underlying MTD device
@ -442,6 +449,7 @@ struct ubi_device {
int peb_size;
int bad_peb_count;
int good_peb_count;
int corr_peb_count;
int erroneous_peb_count;
int max_erroneous;
int min_io_size;
@ -506,6 +514,7 @@ int ubi_calc_data_len(const struct ubi_device *ubi, const void *buf,
int length);
int ubi_check_volume(struct ubi_device *ubi, int vol_id);
void ubi_calculate_reserved(struct ubi_device *ubi);
int ubi_check_pattern(const void *buf, uint8_t patt, int size);
/* eba.c */
int ubi_eba_unmap_leb(struct ubi_device *ubi, struct ubi_volume *vol,

6
drivers/mtd/ubi/vmt.c
View File

@ -261,6 +261,9 @@ int ubi_create_volume(struct ubi_device *ubi, struct ubi_mkvol_req *req)
/* Reserve physical eraseblocks */
if (vol->reserved_pebs > ubi->avail_pebs) {
dbg_err("not enough PEBs, only %d available", ubi->avail_pebs);
if (ubi->corr_peb_count)
dbg_err("%d PEBs are corrupted and not used",
ubi->corr_peb_count);
err = -ENOSPC;
goto out_unlock;
}
@ -527,6 +530,9 @@ int ubi_resize_volume(struct ubi_volume_desc *desc, int reserved_pebs)
if (pebs > ubi->avail_pebs) {
dbg_err("not enough PEBs: requested %d, available %d",
pebs, ubi->avail_pebs);
if (ubi->corr_peb_count)
dbg_err("%d PEBs are corrupted and not used",
ubi->corr_peb_count);
spin_unlock(&ubi->volumes_lock);
err = -ENOSPC;
goto out_free;

10
drivers/mtd/ubi/vtbl.c
View File

@ -366,7 +366,7 @@ write_error:
* Probably this physical eraseblock went bad, try to pick
* another one.
*/
list_add_tail(&new_seb->u.list, &si->corr);
list_add(&new_seb->u.list, &si->erase);
goto retry;
}
kfree(new_seb);
@ -662,9 +662,13 @@ static int init_volumes(struct ubi_device *ubi, const struct ubi_scan_info *si,
ubi->vol_count += 1;
vol->ubi = ubi;
if (reserved_pebs > ubi->avail_pebs)
if (reserved_pebs > ubi->avail_pebs) {
ubi_err("not enough PEBs, required %d, available %d",
reserved_pebs, ubi->avail_pebs);
if (ubi->corr_peb_count)
ubi_err("%d PEBs are corrupted and not used",
ubi->corr_peb_count);
}
ubi->rsvd_pebs += reserved_pebs;
ubi->avail_pebs -= reserved_pebs;
@ -837,7 +841,7 @@ int ubi_read_volume_table(struct ubi_device *ubi, struct ubi_scan_info *si)
return PTR_ERR(ubi->vtbl);
}
ubi->avail_pebs = ubi->good_peb_count;
ubi->avail_pebs = ubi->good_peb_count - ubi->corr_peb_count;
/*
* The layout volume is OK, initialize the corresponding in-RAM data

31
drivers/mtd/ubi/wl.c
View File

@ -745,7 +745,7 @@ static int wear_leveling_worker(struct ubi_device *ubi, struct ubi_work *wrk,
err = ubi_io_read_vid_hdr(ubi, e1->pnum, vid_hdr, 0);
if (err && err != UBI_IO_BITFLIPS) {
if (err == UBI_IO_PEB_FREE) {
if (err == UBI_IO_FF) {
/*
* We are trying to move PEB without a VID header. UBI
* always write VID headers shortly after the PEB was
@ -759,6 +759,16 @@ static int wear_leveling_worker(struct ubi_device *ubi, struct ubi_work *wrk,
dbg_wl("PEB %d has no VID header", e1->pnum);
protect = 1;
goto out_not_moved;
} else if (err == UBI_IO_FF_BITFLIPS) {
/*
* The same situation as %UBI_IO_FF, but bit-flips were
* detected. It is better to schedule this PEB for
* scrubbing.
*/
dbg_wl("PEB %d has no VID header but has bit-flips",
e1->pnum);
scrubbing = 1;
goto out_not_moved;
}
ubi_err("error %d while reading VID header from PEB %d",
@ -1468,22 +1478,6 @@ int ubi_wl_init_scan(struct ubi_device *ubi, struct ubi_scan_info *si)
ubi->lookuptbl[e->pnum] = e;
}
list_for_each_entry(seb, &si->corr, u.list) {
cond_resched();
e = kmem_cache_alloc(ubi_wl_entry_slab, GFP_KERNEL);
if (!e)
goto out_free;
e->pnum = seb->pnum;
e->ec = seb->ec;
ubi->lookuptbl[e->pnum] = e;
if (schedule_erase(ubi, e, 0)) {
kmem_cache_free(ubi_wl_entry_slab, e);
goto out_free;
}
}
ubi_rb_for_each_entry(rb1, sv, &si->volumes, rb) {
ubi_rb_for_each_entry(rb2, seb, &sv->root, u.rb) {
cond_resched();
@ -1510,6 +1504,9 @@ int ubi_wl_init_scan(struct ubi_device *ubi, struct ubi_scan_info *si)
if (ubi->avail_pebs < WL_RESERVED_PEBS) {
ubi_err("no enough physical eraseblocks (%d, need %d)",
ubi->avail_pebs, WL_RESERVED_PEBS);
if (ubi->corr_peb_count)
ubi_err("%d PEBs are corrupted and not used",
ubi->corr_peb_count);
goto out_free;
}
ubi->avail_pebs -= WL_RESERVED_PEBS;