tree bb43f43891a3154741bb6a116dc2956342160f15
parent 8f11b3e99a1136fcbb67316c3260f085299c0bff
author Tejun Heo <tj@kernel.org> 1227846726 +0900
committer Jens Axboe <jens.axboe@oracle.com> 1230535725 +0100

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>