Pass in the BlockDriverState to the command handlers instead of using
the global variable. This is an important step to make the commands
usable outside of qemu-io.
Signed-off-by: NKevin Wolf <kwolf@redhat.com>
Reviewed-by: NEric Blake <eblake@redhat.com>
Signed-off-by: NStefan Hajnoczi <stefanha@redhat.com>