block: Track discard requests
Both bdrv_discard and bdrv_aio_discard will call into bdrv_co_discard, so add tracked_request_begin/end calls around the loop. Signed-off-by: NFam Zheng <famz@redhat.com> Reviewed-by: NKevin Wolf <kwolf@redhat.com> Message-id: 1447064214-29930-4-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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