/**
* self_check_peb_ec_hdr - check erase counter header.
* @ubi: UBI device description object
* @pnum: the physical eraseblock number to check
*
* This function returns zero if the erase counter header is all right and and
* a negative error code if not or if an error occurred.
*/
static int self_check_peb_ec_hdr(const struct ubi_device *ubi, int pnum)
{
int err;
uint32_t crc, hdr_crc;
struct ubi_ec_hdr *ec_hdr;
if (!ubi_dbg_chk_io(ubi))
return 0;
ec_hdr = kzalloc(ubi->ec_hdr_alsize, GFP_NOFS);
if (!ec_hdr)
return -ENOMEM;
err = ubi_io_read(ubi, ec_hdr, pnum, 0, UBI_EC_HDR_SIZE);
if (err && err != UBI_IO_BITFLIPS && !mtd_is_eccerr(err))
goto exit;
crc = crc32(UBI_CRC32_INIT, ec_hdr, UBI_EC_HDR_SIZE_CRC);
hdr_crc = be32_to_cpu(ec_hdr->hdr_crc);
if (hdr_crc != crc) {
ubi_err(ubi, "bad CRC, calculated %#08x, read %#08x",
crc, hdr_crc);
ubi_err(ubi, "self-check failed for PEB %d", pnum);
ubi_dump_ec_hdr(ec_hdr);
dump_stack();
err = -EINVAL;
goto exit;
}
err = self_check_ec_hdr(ubi, pnum, ec_hdr);
exit:
kfree(ec_hdr);
return err;
}
/**
* paranoid_check_peb_vid_hdr - check volume identifier header.
* @ubi: UBI device description object
* @pnum: the physical eraseblock number to check
*
* This function returns zero if the volume identifier header is all right,
* and a negative error code if not or if an error occurred.
*/
static int paranoid_check_peb_vid_hdr(const struct ubi_device *ubi, int pnum)
{
int err;
uint32_t crc, hdr_crc;
struct ubi_vid_hdr *vid_hdr;
void *p;
vid_hdr = ubi_zalloc_vid_hdr(ubi, GFP_NOFS);
if (!vid_hdr)
return -ENOMEM;
p = (char *)vid_hdr - ubi->vid_hdr_shift;
err = ubi_io_read(ubi, p, pnum, ubi->vid_hdr_aloffset,
ubi->vid_hdr_alsize);
if (err && err != UBI_IO_BITFLIPS && err != -EBADMSG)
goto exit;
crc = crc32(UBI_CRC32_INIT, vid_hdr, UBI_EC_HDR_SIZE_CRC);
hdr_crc = be32_to_cpu(vid_hdr->hdr_crc);
if (hdr_crc != crc) {
ubi_err("bad VID header CRC at PEB %d, calculated %#08x, "
"read %#08x", pnum, crc, hdr_crc);
ubi_err("paranoid check failed for PEB %d", pnum);
ubi_dbg_dump_vid_hdr(vid_hdr);
ubi_dbg_dump_stack();
err = -EINVAL;
goto exit;
}
err = paranoid_check_vid_hdr(ubi, pnum, vid_hdr);
exit:
ubi_free_vid_hdr(ubi, vid_hdr);
return err;
}
static int ubi_io_read_vid_hdr(struct ubi_scan_info *ubi, int pnum,
struct ubi_vid_hdr *vh, int unused)
{
u32 magic;
int res;
/* No point in rescanning a corrupt block */
if (test_bit(pnum, ubi->corrupt))
return UBI_IO_BAD_HDR;
/*
* If the block has been scanned already, no need to rescan
*/
if (test_and_set_bit(pnum, ubi->scanned))
return 0;
res = ubi_io_read(ubi, vh, pnum, ubi->vid_offset, sizeof(*vh));
/*
* Bad block, unrecoverable ECC error, skip the block
*/
if (res) {
ubi_dbg("Skipping bad or unreadable block %d", pnum);
vh->magic = 0;
generic_set_bit(pnum, ubi->corrupt);
return res;
}
/* Magic number available ? */
magic = be32_to_cpu(vh->magic);
if (magic != UBI_VID_HDR_MAGIC) {
generic_set_bit(pnum, ubi->corrupt);
if (magic == 0xffffffff)
return UBI_IO_FF;
ubi_msg("Bad magic in block 0%d %08x", pnum, magic);
return UBI_IO_BAD_HDR;
}
/* Header CRC correct ? */
if (crc32(UBI_CRC32_INIT, vh, UBI_VID_HDR_SIZE_CRC) !=
be32_to_cpu(vh->hdr_crc)) {
ubi_msg("Bad CRC in block 0%d", pnum);
generic_set_bit(pnum, ubi->corrupt);
return UBI_IO_BAD_HDR;
}
ubi_dbg("RV: pnum: %i sqnum %llu", pnum, be64_to_cpu(vh->sqnum));
return 0;
}
/**
* ubi_dbg_check_write - make sure write succeeded.
* @ubi: UBI device description object
* @buf: buffer with data which were written
* @pnum: physical eraseblock number the data were written to
* @offset: offset within the physical eraseblock the data were written to
* @len: how many bytes were written
*
* This functions reads data which were recently written and compares it with
* the original data buffer - the data have to match. Returns zero if the data
* match and a negative error code if not or in case of failure.
*/
int ubi_dbg_check_write(struct ubi_device *ubi, const void *buf, int pnum,
int offset, int len)
{
int err, i;
mutex_lock(&ubi->dbg_buf_mutex);
err = ubi_io_read(ubi, ubi->dbg_peb_buf, pnum, offset, len);
if (err)
goto out_unlock;
for (i = 0; i < len; i++) {
uint8_t c = ((uint8_t *)buf)[i];
uint8_t c1 = ((uint8_t *)ubi->dbg_peb_buf)[i];
int dump_len;
if (c == c1)
continue;
ubi_err("paranoid check failed for PEB %d:%d, len %d",
pnum, offset, len);
ubi_msg("data differ at position %d", i);
dump_len = max_t(int, 128, len - i);
ubi_msg("hex dump of the original buffer from %d to %d",
i, i + dump_len);
print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_OFFSET, 32, 1,
buf + i, dump_len, 1);
ubi_msg("hex dump of the read buffer from %d to %d",
i, i + dump_len);
print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_OFFSET, 32, 1,
ubi->dbg_peb_buf + i, dump_len, 1);
ubi_dbg_dump_stack();
err = -EINVAL;
goto out_unlock;
}
mutex_unlock(&ubi->dbg_buf_mutex);
return 0;
out_unlock:
mutex_unlock(&ubi->dbg_buf_mutex);
return err;
}
/**
* self_check_peb_vid_hdr - check volume identifier header.
* @ubi: UBI device description object
* @pnum: the physical eraseblock number to check
*
* This function returns zero if the volume identifier header is all right,
* and a negative error code if not or if an error occurred.
*/
static int self_check_peb_vid_hdr(const struct ubi_device *ubi, int pnum)
{
int err;
uint32_t crc, hdr_crc;
struct ubi_vid_io_buf *vidb;
struct ubi_vid_hdr *vid_hdr;
void *p;
if (!ubi_dbg_chk_io(ubi))
return 0;
vidb = ubi_alloc_vid_buf(ubi, GFP_NOFS);
if (!vidb)
return -ENOMEM;
vid_hdr = ubi_get_vid_hdr(vidb);
p = vidb->buffer;
err = ubi_io_read(ubi, p, pnum, ubi->vid_hdr_aloffset,
ubi->vid_hdr_alsize);
if (err && err != UBI_IO_BITFLIPS && !mtd_is_eccerr(err))
goto exit;
crc = crc32(UBI_CRC32_INIT, vid_hdr, UBI_VID_HDR_SIZE_CRC);
hdr_crc = be32_to_cpu(vid_hdr->hdr_crc);
if (hdr_crc != crc) {
ubi_err(ubi, "bad VID header CRC at PEB %d, calculated %#08x, read %#08x",
pnum, crc, hdr_crc);
ubi_err(ubi, "self-check failed for PEB %d", pnum);
ubi_dump_vid_hdr(vid_hdr);
dump_stack();
err = -EINVAL;
goto exit;
}
err = self_check_vid_hdr(ubi, pnum, vid_hdr);
exit:
ubi_free_vid_buf(vidb);
return err;
}
/**
* ubi_io_read_ec_hdr - read and check an erase counter header.
* @ubi: UBI device description object
* @pnum: physical eraseblock to read from
* @ec_hdr: a &struct ubi_ec_hdr object where to store the read erase counter
* header
* @verbose: be verbose if the header is corrupted or was not found
*
* This function reads erase counter header from physical eraseblock @pnum and
* stores it in @ec_hdr. This function also checks CRC checksum of the read
* erase counter header. The following codes may be returned:
*
* 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 (but may be not);
* o %UBI_IO_BAD_HDR if the erase counter header is corrupted (a CRC error);
* 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;
uint32_t crc, magic, hdr_crc;
dbg_io("read EC header from PEB %d", pnum);
ubi_assert(pnum >= 0 && pnum < ubi->peb_count);
read_err = ubi_io_read(ubi, ec_hdr, pnum, 0, UBI_EC_HDR_SIZE);
if (read_err) {
if (read_err != UBI_IO_BITFLIPS && !mtd_is_eccerr(read_err))
return read_err;
/*
* We read all the data, but either a correctable 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.
*/
}
magic = be32_to_cpu(ec_hdr->magic);
if (magic != UBI_EC_HDR_MAGIC) {
if (mtd_is_eccerr(read_err))
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 (ubi_check_pattern(ec_hdr, 0xFF, UBI_EC_HDR_SIZE)) {
/* The physical eraseblock is supposedly empty */
if (verbose)
ubi_warn(ubi, "no EC header found at PEB %d, only 0xFF bytes",
pnum);
dbg_bld("no EC header found at PEB %d, only 0xFF bytes",
pnum);
if (!read_err)
return UBI_IO_FF;
else
return UBI_IO_FF_BITFLIPS;
}
/*
* This is not a valid erase counter header, and these are not
* 0xFF bytes. Report that the header is corrupted.
*/
if (verbose) {
ubi_warn(ubi, "bad magic number at PEB %d: %08x instead of %08x",
pnum, magic, UBI_EC_HDR_MAGIC);
ubi_dump_ec_hdr(ec_hdr);
}
dbg_bld("bad magic number at PEB %d: %08x instead of %08x",
pnum, magic, UBI_EC_HDR_MAGIC);
return UBI_IO_BAD_HDR;
}
crc = crc32(UBI_CRC32_INIT, ec_hdr, UBI_EC_HDR_SIZE_CRC);
hdr_crc = be32_to_cpu(ec_hdr->hdr_crc);
if (hdr_crc != crc) {
if (verbose) {
ubi_warn(ubi, "bad EC header CRC at PEB %d, calculated %#08x, read %#08x",
pnum, crc, hdr_crc);
ubi_dump_ec_hdr(ec_hdr);
}
dbg_bld("bad EC header CRC at PEB %d, calculated %#08x, read %#08x",
pnum, crc, hdr_crc);
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 */
err = validate_ec_hdr(ubi, ec_hdr);
if (err) {
ubi_err(ubi, "validation failed for PEB %d", pnum);
return -EINVAL;
}
/*
* If there was %-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;
}
/**
* torture_peb - test a supposedly bad physical eraseblock.
* @ubi: UBI device description object
* @pnum: the physical eraseblock number to test
*
* This function returns %-EIO if the physical eraseblock did not pass the
* test, a positive number of erase operations done if the test was
* successfully passed, and other negative error codes in case of other errors.
*/
static int torture_peb(struct ubi_device *ubi, int pnum)
{
int err, i, patt_count;
ubi_msg(ubi, "run torture test for PEB %d", pnum);
patt_count = ARRAY_SIZE(patterns);
ubi_assert(patt_count > 0);
mutex_lock(&ubi->buf_mutex);
for (i = 0; i < patt_count; i++) {
err = do_sync_erase(ubi, pnum);
if (err)
goto out;
/* Make sure the PEB contains only 0xFF bytes */
err = ubi_io_read(ubi, ubi->peb_buf, pnum, 0, ubi->peb_size);
if (err)
goto out;
err = ubi_check_pattern(ubi->peb_buf, 0xFF, ubi->peb_size);
if (err == 0) {
ubi_err(ubi, "erased PEB %d, but a non-0xFF byte found",
pnum);
err = -EIO;
goto out;
}
/* Write a pattern and check it */
memset(ubi->peb_buf, patterns[i], ubi->peb_size);
err = ubi_io_write(ubi, ubi->peb_buf, pnum, 0, ubi->peb_size);
if (err)
goto out;
memset(ubi->peb_buf, ~patterns[i], ubi->peb_size);
err = ubi_io_read(ubi, ubi->peb_buf, pnum, 0, ubi->peb_size);
if (err)
goto out;
err = ubi_check_pattern(ubi->peb_buf, patterns[i],
ubi->peb_size);
if (err == 0) {
ubi_err(ubi, "pattern %x checking failed for PEB %d",
patterns[i], pnum);
err = -EIO;
goto out;
}
}
err = patt_count;
ubi_msg(ubi, "PEB %d passed torture test, do not mark it as bad", pnum);
out:
mutex_unlock(&ubi->buf_mutex);
if (err == UBI_IO_BITFLIPS || mtd_is_eccerr(err)) {
/*
* If a bit-flip or data integrity error was detected, the test
* has not passed because it happened on a freshly erased
* physical eraseblock which means something is wrong with it.
*/
ubi_err(ubi, "read problems on freshly erased PEB %d, must be bad",
pnum);
err = -EIO;
}
return err;
}
/**
* ubi_io_read_vid_hdr - read and check a volume identifier header.
* @ubi: UBI device description object
* @pnum: physical eraseblock number to read from
* @vid_hdr: &struct ubi_vid_hdr object where to store the read volume
* identifier header
* @verbose: be verbose if the header is corrupted or wasn't found
*
* 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 error codes are the same as in
* 'ubi_io_read_ec_hdr()'.
*
* 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;
uint32_t crc, magic, hdr_crc;
void *p;
dbg_io("read VID header from PEB %d", pnum);
ubi_assert(pnum >= 0 && pnum < ubi->peb_count);
p = (char *)vid_hdr - ubi->vid_hdr_shift;
read_err = ubi_io_read(ubi, p, pnum, ubi->vid_hdr_aloffset,
ubi->vid_hdr_alsize);
if (read_err && read_err != UBI_IO_BITFLIPS && !mtd_is_eccerr(read_err))
return read_err;
magic = be32_to_cpu(vid_hdr->magic);
if (magic != UBI_VID_HDR_MAGIC) {
if (mtd_is_eccerr(read_err))
return UBI_IO_BAD_HDR_EBADMSG;
if (ubi_check_pattern(vid_hdr, 0xFF, UBI_VID_HDR_SIZE)) {
if (verbose)
ubi_warn(ubi, "no VID header found at PEB %d, only 0xFF bytes",
pnum);
dbg_bld("no VID header found at PEB %d, only 0xFF bytes",
pnum);
if (!read_err)
return UBI_IO_FF;
else
return UBI_IO_FF_BITFLIPS;
}
if (verbose) {
ubi_warn(ubi, "bad magic number at PEB %d: %08x instead of %08x",
pnum, magic, UBI_VID_HDR_MAGIC);
ubi_dump_vid_hdr(vid_hdr);
}
dbg_bld("bad magic number at PEB %d: %08x instead of %08x",
pnum, magic, UBI_VID_HDR_MAGIC);
return UBI_IO_BAD_HDR;
}
crc = crc32(UBI_CRC32_INIT, vid_hdr, UBI_VID_HDR_SIZE_CRC);
hdr_crc = be32_to_cpu(vid_hdr->hdr_crc);
if (hdr_crc != crc) {
if (verbose) {
ubi_warn(ubi, "bad CRC at PEB %d, calculated %#08x, read %#08x",
pnum, crc, hdr_crc);
ubi_dump_vid_hdr(vid_hdr);
}
dbg_bld("bad CRC at PEB %d, calculated %#08x, read %#08x",
pnum, crc, hdr_crc);
if (!read_err)
return UBI_IO_BAD_HDR;
else
return UBI_IO_BAD_HDR_EBADMSG;
}
err = validate_vid_hdr(ubi, vid_hdr);
if (err) {
ubi_err(ubi, "validation failed for PEB %d", pnum);
return -EINVAL;
}
return read_err ? UBI_IO_BITFLIPS : 0;
}
/**
* ubi_io_read_vid_hdr - read and check a volume identifier header.
* @ubi: UBI device description object
* @pnum: physical eraseblock number to read from
* @vid_hdr: &struct ubi_vid_hdr object where to store the read volume
* identifier header
* @verbose: be verbose if the header is corrupted or wasn't found
*
* 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:
*
* 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_VID_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.
*/
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;
uint32_t crc, magic, hdr_crc;
void *p;
dbg_io("read VID header from PEB %d", 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,
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.
*/
read_err = err;
}
magic = be32_to_cpu(vid_hdr->magic);
if (magic != UBI_VID_HDR_MAGIC) {
/*
* If we have read all 0xFF bytes, the VID header probably does
* not exist and the physical eraseblock is assumed to be free.
*
* But if there was a read error, we do not test the data for
* 0xFFs. Even if it does contain all 0xFFs, this error
* indicates that something is still wrong with this physical
* eraseblock and it cannot be regarded as free.
*/
if (read_err != -EBADMSG &&
check_pattern(vid_hdr, 0xFF, UBI_VID_HDR_SIZE)) {
/* The physical eraseblock is supposedly free */
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;
}
/*
* 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);
ubi_dbg_dump_vid_hdr(vid_hdr);
} else if (UBI_IO_DEBUG)
dbg_msg("bad magic number at PEB %d: %08x instead of "
"%08x", pnum, magic, UBI_VID_HDR_MAGIC);
return UBI_IO_BAD_VID_HDR;
}
crc = crc32(UBI_CRC32_INIT, vid_hdr, UBI_VID_HDR_SIZE_CRC);
hdr_crc = be32_to_cpu(vid_hdr->hdr_crc);
if (hdr_crc != crc) {
if (verbose) {
ubi_warn("bad CRC at PEB %d, calculated %#08x, "
"read %#08x", pnum, crc, hdr_crc);
ubi_dbg_dump_vid_hdr(vid_hdr);
} else if (UBI_IO_DEBUG)
dbg_msg("bad CRC at PEB %d, calculated %#08x, "
"read %#08x", pnum, crc, hdr_crc);
return UBI_IO_BAD_VID_HDR;
}
/* 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;
}
return read_err ? UBI_IO_BITFLIPS : 0;
}
/**
* ubi_io_read_ec_hdr - read and check an erase counter header.
* @ubi: UBI device description object
* @pnum: physical eraseblock to read from
* @ec_hdr: a &struct ubi_ec_hdr object where to store the read erase counter
* header
* @verbose: be verbose if the header is corrupted or was not found
*
* This function reads erase counter header from physical eraseblock @pnum and
* stores it in @ec_hdr. This function also checks CRC checksum of the read
* erase counter header. The following codes may be returned:
*
* 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 (but may be not);
* o %UBI_IO_BAD_EC_HDR if the erase counter header is corrupted (a CRC error);
* o %UBI_IO_PEB_EMPTY if the physical eraseblock is 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;
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;
/*
* 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.
*/
read_err = err;
}
magic = be32_to_cpu(ec_hdr->magic);
if (magic != UBI_EC_HDR_MAGIC) {
/*
* The magic field is wrong. Let's check if we have read all
* 0xFF. If yes, this physical eraseblock is assumed to be
* empty.
*
* But if there was a read error, we do not test it for all
* 0xFFs. Even if it does contain all 0xFFs, this error
* indicates that something is still wrong with this physical
* eraseblock and we anyway cannot treat it as empty.
*/
if (read_err != -EBADMSG &&
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, "
"only 0xFF bytes", pnum);
else if (UBI_IO_DEBUG)
dbg_msg("no EC header found at PEB %d, "
"only 0xFF bytes", pnum);
return UBI_IO_PEB_EMPTY;
}
/*
* This is not a valid erase counter 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_EC_HDR_MAGIC);
ubi_dbg_dump_ec_hdr(ec_hdr);
} else if (UBI_IO_DEBUG)
dbg_msg("bad magic number at PEB %d: %08x instead of "
"%08x", pnum, magic, UBI_EC_HDR_MAGIC);
return UBI_IO_BAD_EC_HDR;
}
crc = crc32(UBI_CRC32_INIT, ec_hdr, UBI_EC_HDR_SIZE_CRC);
hdr_crc = be32_to_cpu(ec_hdr->hdr_crc);
if (hdr_crc != crc) {
if (verbose) {
ubi_warn("bad EC header CRC at PEB %d, calculated "
"%#08x, read %#08x", pnum, crc, hdr_crc);
ubi_dbg_dump_ec_hdr(ec_hdr);
} else if (UBI_IO_DEBUG)
dbg_msg("bad EC header CRC at PEB %d, calculated "
"%#08x, read %#08x", pnum, crc, hdr_crc);
return UBI_IO_BAD_EC_HDR;
}
/* And of course validate what has just been read from the media */
err = validate_ec_hdr(ubi, ec_hdr);
if (err) {
ubi_err("validation failed for PEB %d", pnum);
return -EINVAL;
}
return read_err ? UBI_IO_BITFLIPS : 0;
}
/*
* Load a logical block of a volume into memory
*/
static int ubi_load_block(struct ubi_scan_info *ubi, uint8_t *laddr,
struct ubi_vol_info *vi, u32 vol_id, u32 lnum,
u32 last)
{
struct ubi_vid_hdr *vh, *vrepl;
u32 pnum, crc, dlen;
retry:
/*
* If this is a fastmap run, we try to rescan full, otherwise
* we simply give up.
*/
if (!test_bit(lnum, vi->found)) {
ubi_warn("LEB %d of %d is missing", lnum, last);
return -EINVAL;
}
pnum = vi->lebs_to_pebs[lnum];
ubi_dbg("Load vol %u LEB %u PEB %u", vol_id, lnum, pnum);
if (ubi_io_is_bad(ubi, pnum)) {
ubi_warn("Corrupted mapping block %d PB %d\n", lnum, pnum);
return -EINVAL;
}
if (test_bit(pnum, ubi->corrupt))
goto find_other;
/*
* Lets try to read that block
*/
vh = ubi->blockinfo + pnum;
if (!test_bit(pnum, ubi->scanned)) {
ubi_warn("Vol: %u LEB %u PEB %u not yet scanned", vol_id,
lnum, pnum);
if (ubi_rescan_fm_vid_hdr(ubi, vh, pnum, vol_id, lnum))
goto find_other;
}
/*
* Check, if the total number of blocks is correct
*/
if (be32_to_cpu(vh->used_ebs) != last) {
ubi_dbg("Block count missmatch.");
ubi_dbg("vh->used_ebs: %d nrblocks: %d",
be32_to_cpu(vh->used_ebs), last);
generic_set_bit(pnum, ubi->corrupt);
goto find_other;
}
/*
* Get the data length of this block.
*/
dlen = be32_to_cpu(vh->data_size);
/*
* Read the data into RAM. We ignore the return value
* here as the only thing which might go wrong are
* bitflips. Try nevertheless.
*/
ubi_io_read(ubi, laddr, pnum, ubi->leb_start, dlen);
/* Calculate CRC over the data */
crc = crc32(UBI_CRC32_INIT, laddr, dlen);
if (crc != be32_to_cpu(vh->data_crc)) {
ubi_warn("Vol: %u LEB %u PEB %u data CRC failure", vol_id,
lnum, pnum);
generic_set_bit(pnum, ubi->corrupt);
goto find_other;
}
/* We are good. Return the data length we read */
return dlen;
find_other:
ubi_dbg("Find replacement for LEB %u PEB %u", lnum, pnum);
generic_clear_bit(lnum, vi->found);
vrepl = NULL;
for (pnum = 0; pnum < ubi->peb_count; pnum++) {
struct ubi_vid_hdr *tmp = ubi->blockinfo + pnum;
u32 t_vol_id = be32_to_cpu(tmp->vol_id);
u32 t_lnum = be32_to_cpu(tmp->lnum);
if (test_bit(pnum, ubi->corrupt))
continue;
if (t_vol_id != vol_id || t_lnum != lnum)
continue;
if (!test_bit(pnum, ubi->scanned)) {
ubi_warn("Vol: %u LEB %u PEB %u not yet scanned",
vol_id, lnum, pnum);
if (ubi_rescan_fm_vid_hdr(ubi, tmp, pnum, vol_id, lnum))
continue;
}
/*
* We found one. If its the first, assign it otherwise
* compare the sqnum
*/
generic_set_bit(lnum, vi->found);
if (!vrepl) {
vrepl = tmp;
continue;
}
if (be64_to_cpu(vrepl->sqnum) < be64_to_cpu(tmp->sqnum))
vrepl = tmp;
}
if (vrepl) {
/* Update the vi table */
pnum = vrepl - ubi->blockinfo;
vi->lebs_to_pebs[lnum] = pnum;
ubi_dbg("Trying PEB %u for LEB %u", pnum, lnum);
vh = vrepl;
}
goto retry;
}
static int ubi_scan_fastmap(struct ubi_scan_info *ubi,
struct ubi_attach_info *ai,
int fm_anchor)
{
struct ubi_fm_sb *fmsb, *fmsb2;
struct ubi_vid_hdr *vh;
struct ubi_fastmap_layout *fm;
int i, used_blocks, pnum, ret = 0;
size_t fm_size;
__be32 crc, tmp_crc;
unsigned long long sqnum = 0;
fmsb = &ubi->fm_sb;
fm = &ubi->fm_layout;
ret = ubi_io_read(ubi, fmsb, fm_anchor, ubi->leb_start, sizeof(*fmsb));
if (ret && ret != UBI_IO_BITFLIPS)
goto free_fm_sb;
else if (ret == UBI_IO_BITFLIPS)
fm->to_be_tortured[0] = 1;
if (be32_to_cpu(fmsb->magic) != UBI_FM_SB_MAGIC) {
ubi_err("bad super block magic: 0x%x, expected: 0x%x",
be32_to_cpu(fmsb->magic), UBI_FM_SB_MAGIC);
ret = UBI_BAD_FASTMAP;
goto free_fm_sb;
}
if (fmsb->version != UBI_FM_FMT_VERSION) {
ubi_err("bad fastmap version: %i, expected: %i",
fmsb->version, UBI_FM_FMT_VERSION);
ret = UBI_BAD_FASTMAP;
goto free_fm_sb;
}
used_blocks = be32_to_cpu(fmsb->used_blocks);
if (used_blocks > UBI_FM_MAX_BLOCKS || used_blocks < 1) {
ubi_err("number of fastmap blocks is invalid: %i", used_blocks);
ret = UBI_BAD_FASTMAP;
goto free_fm_sb;
}
fm_size = ubi->leb_size * used_blocks;
if (fm_size != ubi->fm_size) {
ubi_err("bad fastmap size: %zi, expected: %zi", fm_size,
ubi->fm_size);
ret = UBI_BAD_FASTMAP;
goto free_fm_sb;
}
vh = &ubi->fm_vh;
for (i = 0; i < used_blocks; i++) {
pnum = be32_to_cpu(fmsb->block_loc[i]);
if (ubi_io_is_bad(ubi, pnum)) {
ret = UBI_BAD_FASTMAP;
goto free_hdr;
}
#ifdef LATER
int image_seq;
ret = ubi_io_read_ec_hdr(ubi, pnum, ech, 0);
if (ret && ret != UBI_IO_BITFLIPS) {
ubi_err("unable to read fastmap block# %i EC (PEB: %i)",
i, pnum);
if (ret > 0)
ret = UBI_BAD_FASTMAP;
goto free_hdr;
} else if (ret == UBI_IO_BITFLIPS)
fm->to_be_tortured[i] = 1;
image_seq = be32_to_cpu(ech->image_seq);
if (!ubi->image_seq)
ubi->image_seq = image_seq;
/*
* Older UBI implementations have image_seq set to zero, so
* we shouldn't fail if image_seq == 0.
*/
if (image_seq && (image_seq != ubi->image_seq)) {
ubi_err("wrong image seq:%d instead of %d",
be32_to_cpu(ech->image_seq), ubi->image_seq);
ret = UBI_BAD_FASTMAP;
goto free_hdr;
}
#endif
ret = ubi_io_read_vid_hdr(ubi, pnum, vh, 0);
if (ret && ret != UBI_IO_BITFLIPS) {
ubi_err("unable to read fastmap block# %i (PEB: %i)",
i, pnum);
goto free_hdr;
}
/*
* Mainline code rescans the anchor header. We've done
* that already so we merily copy it over.
*/
if (pnum == fm_anchor)
memcpy(vh, ubi->blockinfo + pnum, sizeof(*fm));
if (i == 0) {
if (be32_to_cpu(vh->vol_id) != UBI_FM_SB_VOLUME_ID) {
ubi_err("bad fastmap anchor vol_id: 0x%x," \
" expected: 0x%x",
be32_to_cpu(vh->vol_id),
UBI_FM_SB_VOLUME_ID);
ret = UBI_BAD_FASTMAP;
goto free_hdr;
}
} else {
if (be32_to_cpu(vh->vol_id) != UBI_FM_DATA_VOLUME_ID) {
ubi_err("bad fastmap data vol_id: 0x%x," \
" expected: 0x%x",
be32_to_cpu(vh->vol_id),
UBI_FM_DATA_VOLUME_ID);
ret = UBI_BAD_FASTMAP;
goto free_hdr;
}
}
if (sqnum < be64_to_cpu(vh->sqnum))
sqnum = be64_to_cpu(vh->sqnum);
ret = ubi_io_read(ubi, ubi->fm_buf + (ubi->leb_size * i), pnum,
ubi->leb_start, ubi->leb_size);
if (ret && ret != UBI_IO_BITFLIPS) {
ubi_err("unable to read fastmap block# %i (PEB: %i, " \
"err: %i)", i, pnum, ret);
goto free_hdr;
}
}
fmsb2 = (struct ubi_fm_sb *)(ubi->fm_buf);
tmp_crc = be32_to_cpu(fmsb2->data_crc);
fmsb2->data_crc = 0;
crc = crc32(UBI_CRC32_INIT, ubi->fm_buf, fm_size);
if (crc != tmp_crc) {
ubi_err("fastmap data CRC is invalid");
ubi_err("CRC should be: 0x%x, calc: 0x%x", tmp_crc, crc);
ret = UBI_BAD_FASTMAP;
goto free_hdr;
}
fmsb2->sqnum = sqnum;
fm->used_blocks = used_blocks;
ret = ubi_attach_fastmap(ubi, ai, fm);
if (ret) {
if (ret > 0)
ret = UBI_BAD_FASTMAP;
goto free_hdr;
}
ubi->fm = fm;
ubi->fm_pool.max_size = ubi->fm->max_pool_size;
ubi->fm_wl_pool.max_size = ubi->fm->max_wl_pool_size;
ubi_msg("attached by fastmap %uMB %u blocks",
ubi->fsize_mb, ubi->peb_count);
ubi_dbg("fastmap pool size: %d", ubi->fm_pool.max_size);
ubi_dbg("fastmap WL pool size: %d", ubi->fm_wl_pool.max_size);
out:
if (ret)
ubi_err("Attach by fastmap failed, doing a full scan!");
return ret;
free_hdr:
free_fm_sb:
goto out;
}