1 /*
2  * include/linux/nfsd/syscall.h
3  *
4  * This file holds all declarations for the knfsd syscall interface.
5  *
6  * Copyright (C) 1995-1997 Olaf Kirch <okir@monad.swb.de>
7  */
8 
9 #ifndef NFSD_SYSCALL_H
10 #define NFSD_SYSCALL_H
11 
12 #include <linux/types.h>
13 #include <linux/nfsd/export.h>
14 
15 /*
16  * Version of the syscall interface
17  */
18 #define NFSCTL_VERSION		0x0201
19 
20 /*
21  * These are the commands understood by nfsctl().
22  */
23 #define NFSCTL_SVC		0	/* This is a server process. */
24 #define NFSCTL_ADDCLIENT	1	/* Add an NFS client. */
25 #define NFSCTL_DELCLIENT	2	/* Remove an NFS client. */
26 #define NFSCTL_EXPORT		3	/* export a file system. */
27 #define NFSCTL_UNEXPORT		4	/* unexport a file system. */
28 /*#define NFSCTL_UGIDUPDATE	5	/ * update a client's uid/gid map. DISCARDED */
29 /*#define NFSCTL_GETFH		6	/ * get an fh by ino DISCARDED */
30 #define NFSCTL_GETFD		7	/* get an fh by path (used by mountd) */
31 #define	NFSCTL_GETFS		8	/* get an fh by path with max FH len */
32 
33 /* SVC */
34 struct nfsctl_svc {
35 	unsigned short		svc_port;
36 	int			svc_nthreads;
37 };
38 
39 /* ADDCLIENT/DELCLIENT */
40 struct nfsctl_client {
41 	char			cl_ident[NFSCLNT_IDMAX+1];
42 	int			cl_naddr;
43 	struct in_addr		cl_addrlist[NFSCLNT_ADDRMAX];
44 	int			cl_fhkeytype;
45 	int			cl_fhkeylen;
46 	unsigned char		cl_fhkey[NFSCLNT_KEYMAX];
47 };
48 
49 /* EXPORT/UNEXPORT */
50 struct nfsctl_export {
51 	char			ex_client[NFSCLNT_IDMAX+1];
52 	char			ex_path[NFS_MAXPATHLEN+1];
53 	__kernel_old_dev_t	ex_dev;
54 	__kernel_ino_t		ex_ino;
55 	int			ex_flags;
56 	__kernel_uid_t		ex_anon_uid;
57 	__kernel_gid_t		ex_anon_gid;
58 };
59 
60 /* GETFD */
61 struct nfsctl_fdparm {
62 	struct sockaddr		gd_addr;
63 	char			gd_path[NFS_MAXPATHLEN+1];
64 	int			gd_version;
65 };
66 
67 /* GETFS - GET Filehandle with Size */
68 struct nfsctl_fsparm {
69 	struct sockaddr		gd_addr;
70 	char			gd_path[NFS_MAXPATHLEN+1];
71 	int			gd_maxlen;
72 };
73 
74 /*
75  * This is the argument union.
76  */
77 struct nfsctl_arg {
78 	int			ca_version;	/* safeguard */
79 	union {
80 		struct nfsctl_svc	u_svc;
81 		struct nfsctl_client	u_client;
82 		struct nfsctl_export	u_export;
83 		struct nfsctl_fdparm	u_getfd;
84 		struct nfsctl_fsparm	u_getfs;
85 		/*
86 		 * The following dummy member is needed to preserve binary compatibility
87 		 * on platforms where alignof(void*)>alignof(int).  It's needed because
88 		 * this union used to contain a member (u_umap) which contained a
89 		 * pointer.
90 		 */
91 		void *u_ptr;
92 	} u;
93 #define ca_svc		u.u_svc
94 #define ca_client	u.u_client
95 #define ca_export	u.u_export
96 #define ca_getfd	u.u_getfd
97 #define	ca_getfs	u.u_getfs
98 };
99 
100 union nfsctl_res {
101 	__u8			cr_getfh[NFS_FHSIZE];
102 	struct knfsd_fh		cr_getfs;
103 };
104 
105 #ifdef __KERNEL__
106 /*
107  * Kernel syscall implementation.
108  */
109 extern int		exp_addclient(struct nfsctl_client *ncp);
110 extern int		exp_delclient(struct nfsctl_client *ncp);
111 extern int		exp_export(struct nfsctl_export *nxp);
112 extern int		exp_unexport(struct nfsctl_export *nxp);
113 
114 #endif /* __KERNEL__ */
115 
116 #endif /* NFSD_SYSCALL_H */
117