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authorNeilBrown <neilb@suse.de>2005-11-08 21:39:22 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2005-11-09 07:56:36 -0800
commit4e5314b56a7ea11c7a5f2b8418992b2f49648a25 (patch)
tree58b0c604f4f4e55523d2c93971f79d80e406b9ce /include/linux
parent703ebe86a999861e833be4015aaf552837e9613a (diff)
[PATCH] md: better handling of readerrors with raid5.
This patch changes the behaviour of raid5 when it gets a read error. Instead of just failing the device, it tried to find out what should have been there, and writes it over the bad block. For some media-errors, this has a reasonable chance of fixing the error. If the write succeeds, and a subsequent read succeeds as well, raid5 decided the address is OK and conitnues. Instead of failing a drive on read-error, we attempt to re-write the block, and then re-read. If that all works, we allow the device to remain in the array. Signed-off-by: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/linux')
-rw-r--r--include/linux/raid/raid5.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/raid/raid5.h b/include/linux/raid/raid5.h
index 176fc653c28..f025ba6fb14 100644
--- a/include/linux/raid/raid5.h
+++ b/include/linux/raid/raid5.h
@@ -154,6 +154,8 @@ struct stripe_head {
#define R5_Wantwrite 5
#define R5_Syncio 6 /* this io need to be accounted as resync io */
#define R5_Overlap 7 /* There is a pending overlapping request on this block */
+#define R5_ReadError 8 /* seen a read error here recently */
+#define R5_ReWrite 9 /* have tried to over-write the readerror */
/*
* Write method