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authorArtem Bityutskiy <Artem.Bityutskiy@nokia.com>2009-05-24 14:13:34 +0300
committerArtem Bityutskiy <Artem.Bityutskiy@nokia.com>2009-06-02 13:53:35 +0300
commitb86a2c56e512f46d140a4bcb4e35e8a7d4a99a4b (patch)
tree59c3e036dfd767b73e700bd7fd8cb4bee15c4f58 /drivers/mtd/ubi/eba.c
parent87960c0b12d0c5a0b37e0c79aef77aa1a0b10d44 (diff)
UBI: do not switch to R/O mode on read errors
This patch improves UBI errors handling. ATM UBI switches to R/O mode when the WL worker fails to read the source PEB. This means that the upper layers (e.g., UBIFS) has no chances to unmap the erroneous PEB and fix the error. This patch changes this behaviour and makes UBI put PEBs like this into a separate RB-tree, thus preventing the WL worker from hitting the same read errors again and again. But there is a 10% limit on a maximum amount of PEBs like this. If there are too much of them, UBI switches to R/O mode. Additionally, this patch teaches UBI not to panic and switch to R/O mode if after a PEB has been copied, the target LEB cannot be read back. Instead, now UBI cancels the operation and schedules the target PEB for torturing. The error paths has been tested by ingecting errors into 'ubi_eba_copy_leb()'. Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
Diffstat (limited to 'drivers/mtd/ubi/eba.c')
-rw-r--r--drivers/mtd/ubi/eba.c19
1 files changed, 13 insertions, 6 deletions
diff --git a/drivers/mtd/ubi/eba.c b/drivers/mtd/ubi/eba.c
index 587b6cb5040..632b95f3ff3 100644
--- a/drivers/mtd/ubi/eba.c
+++ b/drivers/mtd/ubi/eba.c
@@ -419,8 +419,9 @@ retry:
* not implemented.
*/
if (err == UBI_IO_BAD_VID_HDR) {
- ubi_warn("bad VID header at PEB %d, LEB"
- "%d:%d", pnum, vol_id, lnum);
+ ubi_warn("corrupted VID header at PEB "
+ "%d, LEB %d:%d", pnum, vol_id,
+ lnum);
err = -EBADMSG;
} else
ubi_ro_mode(ubi);
@@ -1032,6 +1033,8 @@ int ubi_eba_copy_leb(struct ubi_device *ubi, int from, int to,
if (err && err != UBI_IO_BITFLIPS) {
ubi_warn("error %d while reading data from PEB %d",
err, from);
+ if (err == -EIO)
+ err = MOVE_SOURCE_RD_ERR;
goto out_unlock_buf;
}
@@ -1078,9 +1081,11 @@ int ubi_eba_copy_leb(struct ubi_device *ubi, int from, int to,
/* Read the VID header back and check if it was written correctly */
err = ubi_io_read_vid_hdr(ubi, to, vid_hdr, 1);
if (err) {
- if (err != UBI_IO_BITFLIPS)
+ if (err != UBI_IO_BITFLIPS) {
ubi_warn("cannot read VID header back from PEB %d", to);
- else
+ if (err == -EIO)
+ err = MOVE_TARGET_RD_ERR;
+ } else
err = MOVE_CANCEL_BITFLIPS;
goto out_unlock_buf;
}
@@ -1102,10 +1107,12 @@ int ubi_eba_copy_leb(struct ubi_device *ubi, int from, int to,
err = ubi_io_read_data(ubi, ubi->peb_buf2, to, 0, aldata_size);
if (err) {
- if (err != UBI_IO_BITFLIPS)
+ if (err != UBI_IO_BITFLIPS) {
ubi_warn("cannot read data back from PEB %d",
to);
- else
+ if (err == -EIO)
+ err = MOVE_TARGET_RD_ERR;
+ } else
err = MOVE_CANCEL_BITFLIPS;
goto out_unlock_buf;
}