scsi-disk: Switch to byte-based aio block access
Sector-based blk_aio_readv() and blk_aio_writev() should die; switch to byte-based blk_aio_preadv() and blk_aio_pwritev() instead. As part of the cleanup, scsi_init_iovec() no longer needs to return a value, and reword a comment. [ kwolf: Fix read accounting change ] Signed-off-by: NEric Blake <eblake@redhat.com> Signed-off-by: NKevin Wolf <kwolf@redhat.com>
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