block: Introduce bdrv_preadv()
We already have a byte-based bdrv_pwritev(), but the read counterpart was still missing. This commit adds it. Signed-off-by: NKevin Wolf <kwolf@redhat.com> Reviewed-by: NFam Zheng <famz@redhat.com> Reviewed-by: NEric Blake <eblake@redhat.com> Reviewed-by: NStefan Hajnoczi <stefanha@redhat.com>
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