tree 16830a15a7effea352445a7aba5dbb433314d3eb
parent c07e2b41291853b19fff11ceee3657df252a4e42
author Jens Axboe <jens.axboe@oracle.com> 1190890885 +0200
committer Jens Axboe <jens.axboe@oracle.com> 1192525436 +0200

block: Initial support for data-less (or empty) barrier support

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>