tree e9dcfaa75bbd9bc93ae309bbd2129207dc1e36b6
parent 0d910cfeaf2076b116b4517166d5deb0fea76394
author Fam Zheng <famz@redhat.com> 1410414068 +0800
committer Stefan Hajnoczi <stefanha@redhat.com> 1411382337 +0100

block: Add refcnt in BlockDriverAIOCB

This will be useful in synchronous cancel emulation with
bdrv_aio_cancel_async.

Signed-off-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>