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authorTejun Heo <tj@kernel.org>2008-11-28 13:32:06 +0900
committerJens Axboe <jens.axboe@oracle.com>2008-12-29 08:28:45 +0100
commit58eea927d2de43dc6f03d1ba2c46e55854b31540 (patch)
treebb43f43891a3154741bb6a116dc2956342160f15 /block/elevator.c
parent8f11b3e99a1136fcbb67316c3260f085299c0bff (diff)
downloadop-kernel-dev-58eea927d2de43dc6f03d1ba2c46e55854b31540.zip
op-kernel-dev-58eea927d2de43dc6f03d1ba2c46e55854b31540.tar.gz
block: simplify empty barrier implementation
Empty barrier required special handling in __elv_next_request() to complete it without letting the low level driver see it. With previous changes, barrier code is now flexible enough to skip the BAR step using the same barrier sequence selection mechanism. Drop the special handling and mask off q->ordered from start_ordered(). Remove blk_empty_barrier() test which now has no user. Signed-off-by: Tejun Heo <tj@kernel.org> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Diffstat (limited to 'block/elevator.c')
-rw-r--r--block/elevator.c8
1 files changed, 0 insertions, 8 deletions
diff --git a/block/elevator.c b/block/elevator.c
index 261ffaa..ff60177 100644
--- a/block/elevator.c
+++ b/block/elevator.c
@@ -755,14 +755,6 @@ struct request *elv_next_request(struct request_queue *q)
int ret;
while ((rq = __elv_next_request(q)) != NULL) {
- /*
- * Kill the empty barrier place holder, the driver must
- * not ever see it.
- */
- if (blk_empty_barrier(rq)) {
- __blk_end_request(rq, 0, blk_rq_bytes(rq));
- continue;
- }
if (!(rq->cmd_flags & REQ_STARTED)) {
/*
* This is the first time the device driver
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