md/raid5: For stripe with R5_ReadNoMerge, we replace REQ_FLUSH with REQ_NOMERGE.
For R5_ReadNoMerge,it mean this bio can't merge with other bios or request.It used REQ_FLUSH to achieve this. But REQ_NOMERGE can do the same work. Signed-off-by: Jianpeng Ma <majianpeng@gmail.com> Signed-off-by: NeilBrown <neilb@suse.de>
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