From: majianpeng <majianpeng@gmail.com>
Date: Tue, 31 Jul 2012 00:04:21 +0000 (+1000)
Subject: raid5: Add R5_ReadNoMerge flag which prevent bio from merging at block layer
X-Git-Tag: v3.6-rc1~21^2~6
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=3f9e7c140e4c4e75bdeeb8df46dd40e49386c978;p=pandora-kernel.git

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 <majianpeng@gmail.com>
Signed-off-by: NeilBrown <neilb@suse.de>
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