block: simplify empty barrier implementation

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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>

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Tejun Heo 2008-11-28 13:32:06 +09:00 • committed by Jens Axboe

parent 8f11b3e99a

commit 58eea927d2

3 changed files with 10 additions and 15 deletions

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include/linux/blkdev.h

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