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[PATCH] Only the first two bits in bio->bi_rw and rq->flags match

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Not three, as assumed. This causes the barrier bit to be needlessly set
for some IO.

Signed-off-by: Jens Axboe <axboe@suse.de>
This commit is contained in:
Jens Axboe 2006-07-06 10:18:05 +02:00
parent 40359ccb83
commit 1959d21232
2 changed files with 3 additions and 3 deletions
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4
block/ll_rw_blk.c
View file

@ -3491,8 +3491,8 @@ EXPORT_SYMBOL(end_request);
void blk_rq_bio_prep(request_queue_t *q, struct request *rq, struct bio *bio) void blk_rq_bio_prep(request_queue_t *q, struct request *rq, struct bio *bio)
{ {
/* first three bits are identical in rq->flags and bio->bi_rw */ /* first two bits are identical in rq->flags and bio->bi_rw */
rq->flags |= (bio->bi_rw & 7); rq->flags |= (bio->bi_rw & 3);
rq->nr_phys_segments = bio_phys_segments(q, bio); rq->nr_phys_segments = bio_phys_segments(q, bio);
rq->nr_hw_segments = bio_hw_segments(q, bio); rq->nr_hw_segments = bio_hw_segments(q, bio);

2
include/linux/blktrace_api.h
View file

@ -148,7 +148,7 @@ static inline void blk_add_trace_rq(struct request_queue *q, struct request *rq,
u32 what) u32 what)
{ {
struct blk_trace *bt = q->blk_trace; struct blk_trace *bt = q->blk_trace;
int rw = rq->flags & 0x07; int rw = rq->flags & 0x03;
if (likely(!bt)) if (likely(!bt))
return; return;