nfs_async_readahead
if (nfs_async_readahead(vp, rablkoff + bsize,
(void) nfs_async_readahead(vp, blkoff, addr, seg, cr,
if (nfs_async_readahead(vp, rablkoff + bsize,
(void) nfs_async_readahead(vp, blkoff, addr, seg, cr,
extern int nfs_async_readahead(vnode_t *, u_offset_t, caddr_t,