block: Emulate bdrv_ioctl with bdrv_aio_ioctl and track both
Currently all drivers that support .bdrv_aio_ioctl also implement .bdrv_ioctl redundantly. To track ioctl requests in block layer it is easier if we unify the two paths, because we'll need to run it in a coroutine, as required by tracked_request_begin. While we're at it, use .bdrv_aio_ioctl plus aio_poll() to emulate bdrv_ioctl(). Signed-off-by: NFam Zheng <famz@redhat.com> Message-id: 1447064214-29930-7-git-send-email-famz@redhat.com Signed-off-by: NStefan Hajnoczi <stefanha@redhat.com> Signed-off-by: NKevin Wolf <kwolf@redhat.com>
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