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| author | Jens Axboe <jens.axboe@oracle.com> | 2007-09-27 13:01:25 +0200 |
|---|---|---|
| committer | Jens Axboe <jens.axboe@oracle.com> | 2007-10-16 11:03:56 +0200 |
| commit | bf2de6f5a4faf0197268f18d08969b003b87b6e8 (patch) | |
| tree | 16830a15a7effea352445a7aba5dbb433314d3eb /include/linux/blkdev.h | |
| parent | c07e2b41291853b19fff11ceee3657df252a4e42 (diff) | |
block: Initial support for data-less (or empty) barrier support
This implements functionality to pass down or insert a barrier
in a queue, without having data attached to it. The ->prepare_flush_fn()
infrastructure from data barriers are reused to provide this
functionality.
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Diffstat (limited to 'include/linux/blkdev.h')
| -rw-r--r-- | include/linux/blkdev.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index 610967992dd..fb2ff749dc1 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -540,6 +540,7 @@ enum { #define blk_barrier_rq(rq) ((rq)->cmd_flags & REQ_HARDBARRIER) #define blk_fua_rq(rq) ((rq)->cmd_flags & REQ_FUA) #define blk_bidi_rq(rq) ((rq)->next_rq != NULL) +#define blk_empty_barrier(rq) (blk_barrier_rq(rq) && blk_fs_request(rq) && !(rq)->hard_nr_sectors) #define list_entry_rq(ptr) list_entry((ptr), struct request, queuelist) |