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 <linux/types.h>
14 #ifdef __KERNEL__
15 # include <linux/in.h>
16 #endif
17
18 /*
19 * Important limits for the exports stuff.
20 */
21 #define NFSCLNT_IDMAX 1024
22 #define NFSCLNT_ADDRMAX 16
23 #define NFSCLNT_KEYMAX 32
24
25 /*
26 * Export flags.
27 */
28 #define NFSEXP_READONLY 0x0001
29 #define NFSEXP_INSECURE_PORT 0x0002
30 #define NFSEXP_ROOTSQUASH 0x0004
31 #define NFSEXP_ALLSQUASH 0x0008
32 #define NFSEXP_ASYNC 0x0010
33 #define NFSEXP_GATHERED_WRITES 0x0020
34 /* 40 80 100 currently unused */
35 #define NFSEXP_NOHIDE 0x0200
36 #define NFSEXP_NOSUBTREECHECK 0x0400
37 #define NFSEXP_NOAUTHNLM 0x0800 /* Don't authenticate NLM requests - just trust */
38 #define NFSEXP_MSNFS 0x1000 /* do silly things that MS clients expect */
39 #define NFSEXP_FSID 0x2000
40 #define NFSEXP_CROSSMOUNT 0x4000
41 #define NFSEXP_NOACL 0x8000 /* reserved for possible ACL related use */
42 #define NFSEXP_ALLFLAGS 0xFE3F
43
44 /* The flags that may vary depending on security flavor: */
45 #define NFSEXP_SECINFO_FLAGS (NFSEXP_READONLY | NFSEXP_ROOTSQUASH \
46 | NFSEXP_ALLSQUASH)
47
48 #ifdef __KERNEL__
49
50 /*
51 * FS Locations
52 */
53
54 #define MAX_FS_LOCATIONS 128
55
56 struct nfsd4_fs_location {
57 char *hosts; /* colon separated list of hosts */
58 char *path; /* slash separated list of path components */
59 };
60
61 struct nfsd4_fs_locations {
62 uint32_t locations_count;
63 struct nfsd4_fs_location *locations;
64 /* If we're not actually serving this data ourselves (only providing a
65 * list of replicas that do serve it) then we set "migrated": */
66 int migrated;
67 };
68
69 /*
70 * We keep an array of pseudoflavors with the export, in order from most
71 * to least preferred. For the forseeable future, we don't expect more
72 * than the eight pseudoflavors null, unix, krb5, krb5i, krb5p, skpm3,
73 * spkm3i, and spkm3p (and using all 8 at once should be rare).
74 */
75 #define MAX_SECINFO_LIST 8
76
77 struct exp_flavor_info {
78 u32 pseudoflavor;
79 u32 flags;
80 };
81
82 struct svc_export {
83 struct cache_head h;
84 struct auth_domain * ex_client;
85 int ex_flags;
86 struct path ex_path;
87 char *ex_pathname;
88 uid_t ex_anon_uid;
89 gid_t ex_anon_gid;
90 int ex_fsid;
91 unsigned char * ex_uuid; /* 16 byte fsid */
92 struct nfsd4_fs_locations ex_fslocs;
93 int ex_nflavors;
94 struct exp_flavor_info ex_flavors[MAX_SECINFO_LIST];
95 };
96
97 /* an "export key" (expkey) maps a filehandlefragement to an
98 * svc_export for a given client. There can be several per export,
99 * for the different fsid types.
100 */
101 struct svc_expkey {
102 struct cache_head h;
103
104 struct auth_domain * ek_client;
105 int ek_fsidtype;
106 u32 ek_fsid[6];
107
108 struct path ek_path;
109 };
110
111 #define EX_SECURE(exp) (!((exp)->ex_flags & NFSEXP_INSECURE_PORT))
112 #define EX_ISSYNC(exp) (!((exp)->ex_flags & NFSEXP_ASYNC))
113 #define EX_NOHIDE(exp) ((exp)->ex_flags & NFSEXP_NOHIDE)
114 #define EX_WGATHER(exp) ((exp)->ex_flags & NFSEXP_GATHERED_WRITES)
115
116 int nfsexp_flags(struct svc_rqst *rqstp, struct svc_export *exp);
117 __be32 check_nfsd_access(struct svc_export *exp, struct svc_rqst *rqstp);
118
119 /*
120 * Function declarations
121 */
122 int nfsd_export_init(void);
123 void nfsd_export_shutdown(void);
124 void nfsd_export_flush(void);
125 void exp_readlock(void);
126 void exp_readunlock(void);
127 struct svc_export * rqst_exp_get_by_name(struct svc_rqst *,
128 struct path *);
129 struct svc_export * rqst_exp_parent(struct svc_rqst *,
130 struct path *);
131 int exp_rootfh(struct auth_domain *,
132 char *path, struct knfsd_fh *, int maxsize);
133 __be32 exp_pseudoroot(struct svc_rqst *, struct svc_fh *);
134 __be32 nfserrno(int errno);
135
136 extern struct cache_detail svc_export_cache;
137
138 static inline void exp_put(struct svc_export *exp)
139 {
140 cache_put(&exp->h, &svc_export_cache);
141 }
142
143 static inline void exp_get(struct svc_export *exp)
144 {
145 cache_get(&exp->h);
146 }
147 struct svc_export * rqst_exp_find(struct svc_rqst *, int, u32 *);
148
149 #endif /* __KERNEL__ */
150
151 #endif /* NFSD_EXPORT_H */
152
153
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