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UBI: introduce a new IO return code 

This patch introduces the %UBI_IO_BAD_HDR_READ return code for
the I/O level function. We will use this code in order to distinguish
between "corrupted header possibly because this is non-ubi data" and
"corrupted header possibly because of real data corruption and ECC error".

So far this patch does not introduce any functional change, just a
preparation.

This patch is pased on a patch from
Sebastian Andrzej Siewior <sebastian@breakpoint.cc>

Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
Reviewed-by: Sebastian Andrzej Siewior <sebastian@breakpoint.cc>
Tested-by: Sebastian Andrzej Siewior <sebastian@breakpoint.cc>
This commit is contained in:
Artem Bityutskiy 2010-05-03 09:04:39 +03:00
parent 786d783185
commit eb89580e1a
4 changed files with 31 additions and 23 deletions
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5
drivers/mtd/ubi/eba.c
View File

@ -418,7 +418,8 @@ retry:
* may try to recover data. FIXME: but this is
* not implemented.
*/
if (err == UBI_IO_BAD_HDR) {
if (err == UBI_IO_BAD_HDR_READ ||
err == UBI_IO_BAD_HDR) {
ubi_warn("corrupted VID header at PEB "
"%d, LEB %d:%d", pnum, vol_id,
lnum);
@ -962,7 +963,7 @@ write_error:
static int is_error_sane(int err)
{
if (err == -EIO || err == -ENOMEM || err == UBI_IO_BAD_HDR ||
err == -ETIMEDOUT)
err == UBI_IO_BAD_HDR_READ || err == -ETIMEDOUT)
return 0;
return 1;
}

42
drivers/mtd/ubi/io.c
View File

@ -515,7 +515,7 @@ 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)
if (err1 == UBI_IO_BAD_HDR_READ || 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
@ -736,23 +736,21 @@ int ubi_io_read_ec_hdr(struct ubi_device *ubi, int pnum,
* header is still OK, we just report this as there was a
* bit-flip.
*/
read_err = err;
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;
/*
* 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)) {
if (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, "
@ -788,7 +786,7 @@ 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 UBI_IO_BAD_HDR;
return read_err ?: UBI_IO_BAD_HDR;
}
/* And of course validate what has just been read from the media */
@ -798,6 +796,10 @@ int ubi_io_read_ec_hdr(struct ubi_device *ubi, int 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;
}
@ -1008,22 +1010,20 @@ int ubi_io_read_vid_hdr(struct ubi_device *ubi, int pnum,
* 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;
if (err == -EBADMSG)
read_err = UBI_IO_BAD_HDR_READ;
}
magic = be32_to_cpu(vid_hdr->magic);
if (magic != UBI_VID_HDR_MAGIC) {
if (read_err)
return read_err;
/*
* 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)) {
if (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, "
@ -1059,7 +1059,7 @@ 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 UBI_IO_BAD_HDR;
return read_err ?: UBI_IO_BAD_HDR;
}
/* Validate the VID header that we have just read */
@ -1069,6 +1069,10 @@ int ubi_io_read_vid_hdr(struct ubi_device *ubi, int 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;
}

4
drivers/mtd/ubi/scan.c
View File

@ -745,7 +745,7 @@ static int process_eb(struct ubi_device *ubi, struct ubi_scan_info *si,
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) {
else if (err == UBI_IO_BAD_HDR_READ || err == 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
@ -813,7 +813,7 @@ static int process_eb(struct ubi_device *ubi, struct ubi_scan_info *si,
return err;
else if (err == UBI_IO_BITFLIPS)
bitflips = 1;
else if (err == UBI_IO_BAD_HDR ||
else if (err == UBI_IO_BAD_HDR_READ || err == UBI_IO_BAD_HDR ||
(err == UBI_IO_PEB_FREE && ec_corr)) {
/* VID header is corrupted */
err = add_to_list(si, pnum, ec, &si->corr);

3
drivers/mtd/ubi/ubi.h
View File

@ -90,12 +90,15 @@
* 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_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_BITFLIPS: bit-flips were detected and corrected
*/
enum {
UBI_IO_PEB_EMPTY = 1,
UBI_IO_PEB_FREE,
UBI_IO_BAD_HDR,
UBI_IO_BAD_HDR_READ,
UBI_IO_BITFLIPS
};