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/*
 * include/linux/nfsd/syscall.h
 *
 * This file holds all declarations for the knfsd syscall interface.
 *
 * Copyright (C) 1995-1997 Olaf Kirch <okir@monad.swb.de>
 */

#ifndef NFSD_SYSCALL_H
#define NFSD_SYSCALL_H

#include <asm/types.h>
#ifdef __KERNEL__
# include <linux/config.h>
# include <linux/types.h>
# include <linux/in.h>
#endif
#include <linux/posix_types.h>
#include <linux/nfsd/const.h>
#include <linux/nfsd/export.h>
#include <linux/nfsd/nfsfh.h>
#include <linux/nfsd/auth.h>

/*
 * Version of the syscall interface
 */
#define NFSCTL_VERSION          0x0201

/*
 * 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 file system. */
#define NFSCTL_UNEXPORT         4       /* unexport a file system. */
/*#define NFSCTL_UGIDUPDATE     5       / * update a client's uid/gid map. DISCARDED */
/*#define NFSCTL_GETFH          6       / * get an fh by ino DISCARDED */
#define NFSCTL_GETFD            7       /* get an fh by path (used by mountd) */
#define NFSCTL_GETFS            8       /* get an fh by path with max FH len */

/* SVC */
struct nfsctl_svc {
        unsigned short          svc_port;
        int                     svc_nthreads;
};

/* ADDCLIENT/DELCLIENT */
struct nfsctl_client {
        char                    cl_ident[NFSCLNT_IDMAX+1];
        int                     cl_naddr;
        struct in_addr          cl_addrlist[NFSCLNT_ADDRMAX];
        int                     cl_fhkeytype;
        int                     cl_fhkeylen;
        unsigned char           cl_fhkey[NFSCLNT_KEYMAX];
};

/* EXPORT/UNEXPORT */
struct nfsctl_export {
        char                    ex_client[NFSCLNT_IDMAX+1];
        char                    ex_path[NFS_MAXPATHLEN+1];
        __kernel_old_dev_t      ex_dev;
        __kernel_ino_t          ex_ino;
        int                     ex_flags;
        __kernel_uid_t          ex_anon_uid;
        __kernel_gid_t          ex_anon_gid;
};

/* GETFD */
struct nfsctl_fdparm {
        struct sockaddr         gd_addr;
        char                    gd_path[NFS_MAXPATHLEN+1];
        int                     gd_version;
};

/* GETFS - GET Filehandle with Size */
struct nfsctl_fsparm {
        struct sockaddr         gd_addr;
        char                    gd_path[NFS_MAXPATHLEN+1];
        int                     gd_maxlen;
};

/*
 * This is the argument union.
 */
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_fdparm    u_getfd;
                struct nfsctl_fsparm    u_getfs;
                /*
                 * The following dummy member is needed to preserve binary compatibility
                 * on platforms where alignof(void*)>alignof(int).  It's needed because
                 * this union used to contain a member (u_umap) which contained a
                 * pointer.
                 */
                void *u_ptr;
        } u;
#define ca_svc          u.u_svc
#define ca_client       u.u_client
#define ca_export       u.u_export
#define ca_getfd        u.u_getfd
#define ca_getfs        u.u_getfs
};

union nfsctl_res {
        __u8                    cr_getfh[NFS_FHSIZE];
        struct knfsd_fh         cr_getfs;
};

#ifdef __KERNEL__
/*
 * Kernel syscall implementation.
 */
extern asmlinkage long  sys_nfsservctl(int, struct nfsctl_arg __user *, void __user *);
extern int              exp_addclient(struct nfsctl_client *ncp);
extern int              exp_delclient(struct nfsctl_client *ncp);
extern int              exp_export(struct nfsctl_export *nxp);
extern int              exp_unexport(struct nfsctl_export *nxp);

#endif /* __KERNEL__ */

#endif /* NFSD_SYSCALL_H */