diff options
| author | FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> | 2010-07-03 12:45:32 +0400 |
|---|---|---|
| committer | Jens Axboe <jaxboe@fusionio.com> | 2010-08-07 20:23:53 +0400 |
| commit | 8749534fe6826596b71bc409c872b047a8e2755b (patch) | |
| tree | 29ceb928f03dfb33d3a03df1c00e4a51d22b55b3 /block | |
| parent | 802447c1c0513a0ea0e29d6bda23b19ac0686654 (diff) | |
| download | linux-8749534fe6826596b71bc409c872b047a8e2755b.tar.xz | |
block: introduce REQ_FLUSH flag
SCSI-ml needs a way to mark a request as flush request in
q->prepare_flush_fn because it needs to identify them later (e.g. in
q->request_fn or prep_rq_fn).
queue_flush sets REQ_HARDBARRIER in rq->cmd_flags however the block
layer also sends normal REQ_TYPE_FS requests with REQ_HARDBARRIER. So
SCSI-ml can't use REQ_HARDBARRIER to identify flush requests.
We could change the block layer to clear REQ_HARDBARRIER bit before
sending non flush requests to the lower layers. However, intorudcing
the new flag looks cleaner (surely easier).
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Cc: James Bottomley <James.Bottomley@suse.de>
Cc: David S. Miller <davem@davemloft.net>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Alasdair G Kergon <agk@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
Diffstat (limited to 'block')
| -rw-r--r-- | block/blk-barrier.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/block/blk-barrier.c b/block/blk-barrier.c index 7c6f4a714687..a3482425c507 100644 --- a/block/blk-barrier.c +++ b/block/blk-barrier.c @@ -143,7 +143,7 @@ static void queue_flush(struct request_queue *q, unsigned which) } blk_rq_init(q, rq); - rq->cmd_flags = REQ_HARDBARRIER; + rq->cmd_flags = REQ_HARDBARRIER | REQ_FLUSH; rq->rq_disk = q->bar_rq.rq_disk; rq->end_io = end_io; q->prepare_flush_fn(q, rq); |