block: make every barrier action optional

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In all barrier sequences, the barrier write itself was always assumed
to be issued and thus didn't have corresponding control flag.  This
patch adds QUEUE_ORDERED_DO_BAR and unify action mask handling in
start_ordered() such that any barrier action can be skipped.

This patch doesn't introduce any visible behavior changes.

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 13:32:04 +09:00 • committed by Jens Axboe

parent a7384677b2

commit f671620e7d

2 changed files with 29 additions and 19 deletions

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7

include/linux/blkdev.h

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