From 3f9e7c140e4c4e75bdeeb8df46dd40e49386c978 Mon Sep 17 00:00:00 2001 From: majianpeng Date: Tue, 31 Jul 2012 10:04:21 +1000 Subject: raid5: Add R5_ReadNoMerge flag which prevent bio from merging at block layer Because bios will merge at block-layer,so bios-error may caused by other bio which be merged into to the same request. Using this flag,it will find exactly error-sector and not do redundant operation like re-write and re-read. V0->V1:Using REQ_FLUSH instead REQ_NOMERGE avoid bio merging at block layer. Signed-off-by: Jianpeng Ma Signed-off-by: NeilBrown --- drivers/md/raid5.h | 1 + 1 file changed, 1 insertion(+) (limited to 'drivers/md/raid5.h') diff --git a/drivers/md/raid5.h b/drivers/md/raid5.h index f03fb3395183..61dbb615c30b 100644 --- a/drivers/md/raid5.h +++ b/drivers/md/raid5.h @@ -274,6 +274,7 @@ enum r5dev_flags { R5_Wantwrite, R5_Overlap, /* There is a pending overlapping request * on this block */ + R5_ReadNoMerge, /* prevent bio from merging in block-layer */ R5_ReadError, /* seen a read error here recently */ R5_ReWrite, /* have tried to over-write the readerror */ -- cgit v1.2.3