tree e93bd7014305629874c116d50cea985ce097c041
parent e3442099a2794925dfbe83711cd204caf80eae60
author Stefan Hajnoczi <stefanha@redhat.com> 1416406785 +0000
committer Kevin Wolf <kwolf@redhat.com> 1418203530 +0100

blockdev: acquire AioContext in change-backing-file

Add dataplane support to the change-backing-file QMP commands.  By
acquiring the AioContext we avoid race conditions with the dataplane
thread which may also be accessing the BlockDriverState.

Note that this command operates on both bs and a node in its chain
(image_bs).  The bdrv_chain_contains(bs, image_bs) check guarantees that
bs and image_bs are in the same AioContext.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>