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block: separate priority boosting from REQ_META

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Add a new REQ_PRIO to let requests preempt others in the cfq I/O schedule,
and lave REQ_META purely for marking requests as metadata in blktrace.

All existing callers of REQ_META except for XFS are updated to also
set REQ_PRIO for now.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Namhyung Kim <namhyung@gmail.com>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
This commit is contained in:
Christoph Hellwig
2011-08-23 14:50:29 +02:00
committed by Jens Axboe
parent 5dc06c5a70
commit 65299a3b78
11 changed files with 32 additions and 25 deletions
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4
fs/gfs2/log.c
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@@ -624,9 +624,9 @@ static void log_write_header(struct gfs2_sbd *sdp, u32 flags, int pull)
bh->b_end_io = end_buffer_write_sync;
get_bh(bh);
if (test_bit(SDF_NOBARRIERS, &sdp->sd_flags))
submit_bh(WRITE_SYNC | REQ_META, bh);
submit_bh(WRITE_SYNC | REQ_META | REQ_PRIO, bh);
else
submit_bh(WRITE_FLUSH_FUA | REQ_META, bh);
submit_bh(WRITE_FLUSH_FUA | REQ_META | REQ_PRIO, bh);
wait_on_buffer(bh);
if (!buffer_uptodate(bh))