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>
diff --git a/drivers/mtd/ubi/io.c b/drivers/mtd/ubi/io.c
index 02b1932..b812f88 100644
--- a/drivers/mtd/ubi/io.c
+++ b/drivers/mtd/ubi/io.c
@@ -515,7 +515,7 @@
* 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 @@
* 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 @@
} 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 @@
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 @@
* 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 @@
} 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 @@
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;
}