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 struct svc_export {
49 struct cache_head h;
50 struct auth_domain * ex_client;
51 int ex_flags;
52 struct vfsmount * ex_mnt;
53 struct dentry * ex_dentry;
54 uid_t ex_anon_uid;
55 gid_t ex_anon_gid;
56 int ex_fsid;
57 };
58
59 /* an "export key" (expkey) maps a filehandlefragement to an
60 * svc_export for a given client. There can be two per export, one
61 * for type 0 (dev/ino), one for type 1 (fsid)
62 */
63 struct svc_expkey {
64 struct cache_head h;
65
66 struct auth_domain * ek_client;
67 int ek_fsidtype;
68 u32 ek_fsid[3];
69
70 struct svc_export * ek_export;
71 };
72
73 #define EX_SECURE(exp) (!((exp)->ex_flags & NFSEXP_INSECURE_PORT))
74 #define EX_ISSYNC(exp) (!((exp)->ex_flags & NFSEXP_ASYNC))
75 #define EX_RDONLY(exp) ((exp)->ex_flags & NFSEXP_READONLY)
76 #define EX_NOHIDE(exp) ((exp)->ex_flags & NFSEXP_NOHIDE)
77 #define EX_WGATHER(exp) ((exp)->ex_flags & NFSEXP_GATHERED_WRITES)
78
79
80 /*
81 * Function declarations
82 */
83 void nfsd_export_init(void);
84 void nfsd_export_shutdown(void);
85 void nfsd_export_flush(void);
86 void exp_readlock(void);
87 void exp_readunlock(void);
88 struct svc_expkey * exp_find_key(struct auth_domain *clp,
89 int fsid_type, u32 *fsidv,
90 struct cache_req *reqp);
91 struct svc_export * exp_get_by_name(struct auth_domain *clp,
92 struct vfsmount *mnt,
93 struct dentry *dentry,
94 struct cache_req *reqp);
95 struct svc_export * exp_parent(struct auth_domain *clp,
96 struct vfsmount *mnt,
97 struct dentry *dentry,
98 struct cache_req *reqp);
99 int exp_rootfh(struct auth_domain *,
100 char *path, struct knfsd_fh *, int maxsize);
101 int exp_pseudoroot(struct auth_domain *, struct svc_fh *fhp, struct cache_req *creq);
102 int nfserrno(int errno);
103
104 extern void expkey_put(struct cache_head *item, struct cache_detail *cd);
105 extern void svc_export_put(struct cache_head *item, struct cache_detail *cd);
106 extern struct cache_detail svc_export_cache, svc_expkey_cache;
107
108 static inline void exp_put(struct svc_export *exp)
109 {
110 svc_export_put(&exp->h, &svc_export_cache);
111 }
112
113 static inline void exp_get(struct svc_export *exp)
114 {
115 cache_get(&exp->h);
116 }
117 static inline struct svc_export *
118 exp_find(struct auth_domain *clp, int fsid_type, u32 *fsidv,
119 struct cache_req *reqp)
120 {
121 struct svc_expkey *ek = exp_find_key(clp, fsid_type, fsidv, reqp);
122 if (ek && !IS_ERR(ek)) {
123 struct svc_export *exp = ek->ek_export;
124 int err;
125 exp_get(exp);
126 expkey_put(&ek->h, &svc_expkey_cache);
127 if ((err = cache_check(&svc_export_cache, &exp->h, reqp)))
128 exp = ERR_PTR(err);
129 return exp;
130 } else
131 return ERR_PTR(PTR_ERR(ek));
132 }
133
134 #endif /* __KERNEL__ */
135
136 #endif /* NFSD_EXPORT_H */
137
138
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