aboutsummaryrefslogtreecommitdiffstats
path: root/include/linux/nfsd/export.h
diff options
context:
space:
mode:
Diffstat (limited to 'include/linux/nfsd/export.h')
-rw-r--r--include/linux/nfsd/export.h137
1 files changed, 137 insertions, 0 deletions
diff --git a/include/linux/nfsd/export.h b/include/linux/nfsd/export.h
new file mode 100644
index 000000000000..6bad4766d3d9
--- /dev/null
+++ b/include/linux/nfsd/export.h
@@ -0,0 +1,137 @@
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
48struct 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 */
63struct 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 */
83void nfsd_export_init(void);
84void nfsd_export_shutdown(void);
85void nfsd_export_flush(void);
86void exp_readlock(void);
87void exp_readunlock(void);
88struct svc_expkey * exp_find_key(struct auth_domain *clp,
89 int fsid_type, u32 *fsidv,
90 struct cache_req *reqp);
91struct svc_export * exp_get_by_name(struct auth_domain *clp,
92 struct vfsmount *mnt,
93 struct dentry *dentry,
94 struct cache_req *reqp);
95struct svc_export * exp_parent(struct auth_domain *clp,
96 struct vfsmount *mnt,
97 struct dentry *dentry,
98 struct cache_req *reqp);
99int exp_rootfh(struct auth_domain *,
100 char *path, struct knfsd_fh *, int maxsize);
101int exp_pseudoroot(struct auth_domain *, struct svc_fh *fhp, struct cache_req *creq);
102int nfserrno(int errno);
103
104extern void expkey_put(struct cache_head *item, struct cache_detail *cd);
105extern void svc_export_put(struct cache_head *item, struct cache_detail *cd);
106extern struct cache_detail svc_export_cache, svc_expkey_cache;
107
108static inline void exp_put(struct svc_export *exp)
109{
110 svc_export_put(&exp->h, &svc_export_cache);
111}
112
113static inline void exp_get(struct svc_export *exp)
114{
115 cache_get(&exp->h);
116}
117static inline struct svc_export *
118exp_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