block: fix empty barrier on write-through w/ ordered tag

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Empty barrier on write-through (or no cache) w/ ordered tag has no
command to execute and without any command to execute ordered tag is
never issued to the device and the ordering is never achieved.  Force
draining for such cases.

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 13:32:07 +09:00 • committed by Jens Axboe

parent 58eea927d2

commit a185eb4bc8

1 changed files with 13 additions and 1 deletions

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block/blk-barrier.c

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