block: Prepare bdrv_aligned_preadv() for byte-aligned requests
This patch makes bdrv_aligned_preadv() ready to accept byte-aligned requests. Note that this doesn't mean that such requests are actually made. The caller still ensures that all requests are aligned to at least 512 bytes. Signed-off-by: NKevin Wolf <kwolf@redhat.com> Reviewed-by: NEric Blake <eblake@redhat.com> Reviewed-by: NStefan Hajnoczi <stefanha@redhat.com>
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