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md: use REQ_NOIDLE flag in md_super_write() 

Queue idling is used for the anticipation of immediate
sequencial I/O's but md_super_write() is a kind of one-
shot operation, coupled with md_super_wait(), so the
idling in this case will be just a waste of time.

Specifying REQ_NOIDLE prevents it. Instead of adding
the flag to submit_bio() directly, use pre-defined
macro WRITE_FLUSH_FUA.

Signed-off-by: Namhyung Kim <namhyung@gmail.com>
Signed-off-by: NeilBrown <neilb@suse.de>
This commit is contained in:
Namhyung Kim 2011-08-25 14:43:34 +10:00 committed by NeilBrown
parent aeb9b21184
commit a5bf4df0c8
1 changed files with 1 additions and 1 deletions
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2
drivers/md/md.c
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@ -848,7 +848,7 @@ void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev,
bio->bi_end_io = super_written;
atomic_inc(&mddev->pending_writes);
submit_bio(REQ_WRITE | REQ_SYNC | REQ_FLUSH | REQ_FUA, bio);
submit_bio(WRITE_FLUSH_FUA, bio);
}
void md_super_wait(mddev_t *mddev)