nfsread
extern ssize_t nfsread(struct nfs_file *, char *, size_t);
count = nfsread(&filep->file, buf, size);
error = bp->b_error = nfsread(bp->b_vp, bp->b_un.b_addr,
error = nfsread(vp, base, uiop->uio_offset, n,
static int nfsread(vnode_t *, caddr_t, uint_t, int, size_t *, cred_t *);