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1/*
2 * include/linux/nfsd/export.h
3 *
4 * Public declarations for NFS exports. The definitions for the
5 * syscall interface are in nfsctl.h
6 *
7 * Copyright (C) 1995-1997 Olaf Kirch <okir@monad.swb.de>
8 */
9
10#ifndef NFSD_EXPORT_H
11#define NFSD_EXPORT_H
12
13#include <asm/types.h>
14#ifdef __KERNEL__
15# include <linux/types.h>
16# include <linux/in.h>
17#endif
18
19/*
20 * Important limits for the exports stuff.
21 */
22#define NFSCLNT_IDMAX 1024
23#define NFSCLNT_ADDRMAX 16
24#define NFSCLNT_KEYMAX 32
25
26/*
27 * Export flags.
28 */
29#define NFSEXP_READONLY 0x0001
30#define NFSEXP_INSECURE_PORT 0x0002
31#define NFSEXP_ROOTSQUASH 0x0004
32#define NFSEXP_ALLSQUASH 0x0008
33#define NFSEXP_ASYNC 0x0010
34#define NFSEXP_GATHERED_WRITES 0x0020
35/* 40 80 100 currently unused */
36#define NFSEXP_NOHIDE 0x0200
37#define NFSEXP_NOSUBTREECHECK 0x0400
38#define NFSEXP_NOAUTHNLM 0x0800 /* Don't authenticate NLM requests - just trust */
39#define NFSEXP_MSNFS 0x1000 /* do silly things that MS clients expect */
40#define NFSEXP_FSID 0x2000
41#define NFSEXP_CROSSMOUNT 0x4000
42#define NFSEXP_NOACL 0x8000 /* reserved for possible ACL related use */
43#define NFSEXP_ALLFLAGS 0xFE3F
44
45
46#ifdef __KERNEL__
47
48/*
49 * FS Locations
50 */
51
52#define MAX_FS_LOCATIONS 128
53
54struct nfsd4_fs_location {
55 char *hosts; /* colon separated list of hosts */
56 char *path; /* slash separated list of path components */
57};
58
59struct nfsd4_fs_locations {
60 uint32_t locations_count;
61 struct nfsd4_fs_location *locations;
62/* If we're not actually serving this data ourselves (only providing a
63 * list of replicas that do serve it) then we set "migrated": */
64 int migrated;
65};
66
67struct svc_export {
68 struct cache_head h;
69 struct auth_domain * ex_client;
70 int ex_flags;
71 struct vfsmount * ex_mnt;
72 struct dentry * ex_dentry;
73 char * ex_path;
74 uid_t ex_anon_uid;
75 gid_t ex_anon_gid;
76 int ex_fsid;
77 unsigned char * ex_uuid; /* 16 byte fsid */
78 struct nfsd4_fs_locations ex_fslocs;
79};
80
81/* an "export key" (expkey) maps a filehandlefragement to an
82 * svc_export for a given client. There can be several per export,
83 * for the different fsid types.
84 */
85struct svc_expkey {
86 struct cache_head h;
87
88 struct auth_domain * ek_client;
89 int ek_fsidtype;
90 u32 ek_fsid[6];
91
92 struct vfsmount * ek_mnt;
93 struct dentry * ek_dentry;
94};
95
96#define EX_SECURE(exp) (!((exp)->ex_flags & NFSEXP_INSECURE_PORT))
97#define EX_ISSYNC(exp) (!((exp)->ex_flags & NFSEXP_ASYNC))
98#define EX_RDONLY(exp) ((exp)->ex_flags & NFSEXP_READONLY)
99#define EX_NOHIDE(exp) ((exp)->ex_flags & NFSEXP_NOHIDE)
100#define EX_WGATHER(exp) ((exp)->ex_flags & NFSEXP_GATHERED_WRITES)
101
102
103/*
104 * Function declarations
105 */
106void nfsd_export_init(void);
107void nfsd_export_shutdown(void);
108void nfsd_export_flush(void);
109void exp_readlock(void);
110void exp_readunlock(void);
111struct svc_export * exp_get_by_name(struct auth_domain *clp,
112 struct vfsmount *mnt,
113 struct dentry *dentry,
114 struct cache_req *reqp);
115struct svc_export * exp_parent(struct auth_domain *clp,
116 struct vfsmount *mnt,
117 struct dentry *dentry,
118 struct cache_req *reqp);
119int exp_rootfh(struct auth_domain *,
120 char *path, struct knfsd_fh *, int maxsize);
121__be32 exp_pseudoroot(struct auth_domain *, struct svc_fh *fhp, struct cache_req *creq);
122__be32 nfserrno(int errno);
123
124extern struct cache_detail svc_export_cache;
125
126static inline void exp_put(struct svc_export *exp)
127{
128 cache_put(&exp->h, &svc_export_cache);
129}
130
131static inline void exp_get(struct svc_export *exp)
132{
133 cache_get(&exp->h);
134}
135extern struct svc_export *
136exp_find(struct auth_domain *clp, int fsid_type, u32 *fsidv,
137 struct cache_req *reqp);
138
139#endif /* __KERNEL__ */
140
141#endif /* NFSD_EXPORT_H */
142