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       nfsservctl - syscall interface to kernel nfs daemon


       #include <linux/nfsd/syscall.h>

       long nfsservctl(int cmd, struct nfsctl_arg *argp,
                       union nfsctl_res *resp);


       Note:  Since Linux 3.1, this system call no longer exists.  It has been
       replaced by a set of files in the nfsd filesystem; see nfsd(7).

        * 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's UID/GID map
                                           (only in Linux 2.4.x and earlier). */
       #define NFSCTL_GETFH        6    /* Get a file handle (used by mountd)
                                           (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;


       On success, zero is returned.  On error, -1 is returned, and  errno  is
       set appropriately.


       This call is Linux-specific.


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