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block: Initial support for data-less (or empty) barrier support
authorJens Axboe <jens.axboe@oracle.com>
Thu, 27 Sep 2007 11:01:25 +0000 (13:01 +0200)
committerJens Axboe <jens.axboe@oracle.com>
Tue, 16 Oct 2007 09:03:56 +0000 (11:03 +0200)
This implements functionality to pass down or insert a barrier
in a queue, without having data attached to it. The ->prepare_flush_fn()
infrastructure from data barriers are reused to provide this
functionality.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

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