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 /* The flags that may vary depending on security flavor: */
46 #define NFSEXP_SECINFO_FLAGS (NFSEXP_READONLY | NFSEXP_ROOTSQUASH \
47 | NFSEXP_ALLSQUASH)
48
49 #ifdef __KERNEL__
50
51 /*
52 * FS Locations
53 */
54
55 #define MAX_FS_LOCATIONS 128
56
57 struct nfsd4_fs_location {
58 char *hosts; /* colon separated list of hosts */
59 char *path; /* slash separated list of path components */
60 };
61
62 struct nfsd4_fs_locations {
63 uint32_t locations_count;
64 struct nfsd4_fs_location *locations;
65 /* If we're not actually serving this data ourselves (only providing a
66 * list of replicas that do serve it) then we set "migrated": */
67 int migrated;
68 };
69
70 /*
71 * We keep an array of pseudoflavors with the export, in order from most
72 * to least preferred. For the forseeable future, we don't expect more
73 * than the eight pseudoflavors null, unix, krb5, krb5i, krb5p, skpm3,
74 * spkm3i, and spkm3p (and using all 8 at once should be rare).
75 */
76 #define MAX_SECINFO_LIST 8
77
78 struct exp_flavor_info {
79 u32 pseudoflavor;
80 u32 flags;
81 };
82
83 struct svc_export {
84 struct cache_head h;
85 struct auth_domain * ex_client;
86 int ex_flags;
87 struct path ex_path;
88 char *ex_pathname;
89 uid_t ex_anon_uid;
90 gid_t ex_anon_gid;
91 int ex_fsid;
92 unsigned char * ex_uuid; /* 16 byte fsid */
93 struct nfsd4_fs_locations ex_fslocs;
94 int ex_nflavors;
95 struct exp_flavor_info ex_flavors[MAX_SECINFO_LIST];
96 };
97
98 /* an "export key" (expkey) maps a filehandlefragement to an
99 * svc_export for a given client. There can be several per export,
100 * for the different fsid types.
101 */
102 struct svc_expkey {
103 struct cache_head h;
104
105 struct auth_domain * ek_client;
106 int ek_fsidtype;
107 u32 ek_fsid[6];
108
109 struct path ek_path;
110 };
111
112 #define EX_SECURE(exp) (!((exp)->ex_flags & NFSEXP_INSECURE_PORT))
113 #define EX_ISSYNC(exp) (!((exp)->ex_flags & NFSEXP_ASYNC))
114 #define EX_NOHIDE(exp) ((exp)->ex_flags & NFSEXP_NOHIDE)
115 #define EX_WGATHER(exp) ((exp)->ex_flags & NFSEXP_GATHERED_WRITES)
116
117 int nfsexp_flags(struct svc_rqst *rqstp, struct svc_export *exp);
118 __be32 check_nfsd_access(struct svc_export *exp, struct svc_rqst *rqstp);
119
120 /*
121 * Function declarations
122 */
123 int nfsd_export_init(void);
124 void nfsd_export_shutdown(void);
125 void nfsd_export_flush(void);
126 void exp_readlock(void);
127 void exp_readunlock(void);
128 struct svc_export * rqst_exp_get_by_name(struct svc_rqst *,
129 struct vfsmount *,
130 struct dentry *);
131 struct svc_export * rqst_exp_parent(struct svc_rqst *,
132 struct vfsmount *mnt,
133 struct dentry *dentry);
134 int exp_rootfh(struct auth_domain *,
135 char *path, struct knfsd_fh *, int maxsize);
136 __be32 exp_pseudoroot(struct svc_rqst *, struct svc_fh *);
137 __be32 nfserrno(int errno);
138
139 extern struct cache_detail svc_export_cache;
140
141 static inline void exp_put(struct svc_export *exp)
142 {
143 cache_put(&exp->h, &svc_export_cache);
144 }
145
146 static inline void exp_get(struct svc_export *exp)
147 {
148 cache_get(&exp->h);
149 }
150 struct svc_export * rqst_exp_find(struct svc_rqst *, int, u32 *);
151
152 #endif /* __KERNEL__ */
153
154 #endif /* NFSD_EXPORT_H */
155
156
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