nfsd_open
nfserr = nfsd_open(rqstp, &fh, S_IFREG, access, filp);
err = nfsd_open(rqstp, fhp, S_IFDIR, may_flags, &file);
__be32 nfsd_open(struct svc_rqst *, struct svc_fh *, umode_t,