tree c92a8394f0ae9d0378398f830f3396e0028520cc
parent f197fe2b2c77259b6570620f288d905bfa38e2da
author Fam Zheng <famz@redhat.com> 1410414069 +0800
committer Stefan Hajnoczi <stefanha@redhat.com> 1411382338 +0100

block: Add bdrv_aio_cancel_async

This is the async version of bdrv_aio_cancel, which doesn't block the
caller. It guarantees that the cb is called either before returning or
some time later.

bdrv_aio_cancel can base on bdrv_aio_cancel_async, later we can convert
all .io_cancel implementations to .io_cancel_async, and the aio_poll is
the common logic. In the end, .io_cancel can be dropped.

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