nfs_doio
nfs_doio(bp, NULL);
error = nfs_doio(bp, p);
error = nfs_doio(bp, p);
(void) nfs_doio(bp, NULL);
(void) nfs_doio(bp, NULL);
int nfs_doio(struct buf *, struct proc *);
error = nfs_doio(bp, p);