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+.\" %%%LICENSE_START(PUBLIC_DOMAIN)
+.\" This text is in the public domain.
+.\" %%%LICENSE_END
+.\"
+.TH nfsservctl 2 (date) "Linux man-pages (unreleased)"
+.SH NAME
+nfsservctl \- syscall interface to kernel nfs daemon
+.SH LIBRARY
+Standard C library
+.RI ( libc ", " \-lc )
+.SH SYNOPSIS
+.nf
+.B #include <linux/nfsd/syscall.h>
+.P
+.BI "long nfsservctl(int " cmd ", struct nfsctl_arg *" argp ,
+.BI "                union nfsctl_res *" resp );
+.fi
+.SH DESCRIPTION
+.IR Note :
+Since Linux 3.1, this system call no longer exists.
+It has been replaced by a set of files in the
+.I nfsd
+filesystem; see
+.BR nfsd (7).
+.P
+.in +4n
+.EX
+/*
+ * These are the commands understood by nfsctl().
+ */
+#define NFSCTL_SVC        0  /* This is a server process. */
+#define NFSCTL_ADDCLIENT  1  /* Add an NFS client. */
+#define NFSCTL_DELCLIENT  2  /* Remove an NFS client. */
+#define NFSCTL_EXPORT     3  /* Export a filesystem. */
+#define NFSCTL_UNEXPORT   4  /* Unexport a filesystem. */
+#define NFSCTL_UGIDUPDATE 5  /* Update a client\[aq]s UID/GID map
+                                (only in Linux 2.4.x and earlier). */
+#define NFSCTL_GETFH      6  /* Get a file handle (used by mountd(8))
+                                (only in Linux 2.4.x and earlier). */
+\&
+struct nfsctl_arg {
+    int                       ca_version;     /* safeguard */
+    union {
+        struct nfsctl_svc     u_svc;
+        struct nfsctl_client  u_client;
+        struct nfsctl_export  u_export;
+        struct nfsctl_uidmap  u_umap;
+        struct nfsctl_fhparm  u_getfh;
+        unsigned int          u_debug;
+    } u;
+}
+\&
+union nfsctl_res {
+        struct knfs_fh          cr_getfh;
+        unsigned int            cr_debug;
+};
+.EE
+.in
+.SH RETURN VALUE
+On success, zero is returned.
+On error, \-1 is returned, and
+.I errno
+is set to indicate the error.
+.SH STANDARDS
+Linux.
+.SH HISTORY
+Removed in Linux 3.1.
+Removed in glibc 2.28.
+.SH SEE ALSO
+.BR nfsd (7)