nfs3read
extern ssize_t nfs3read(struct nfs_file *, char *, size_t);
count = nfs3read(&filep->file, buf, size);
static int nfs3read(vnode_t *, caddr_t, offset_t, int, size_t *, cred_t *);
error = bp->b_error = nfs3read(bp->b_vp, bp->b_un.b_addr,