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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/* 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
57struct nfsd4_fs_location {
58 char *hosts; /* colon separated list of hosts */
59 char *path; /* slash separated list of path components */
60};
61
62struct 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
78struct exp_flavor_info {
79 u32 pseudoflavor;
80 u32 flags;
81};
82
83struct svc_export {
84 struct cache_head h;
85 struct auth_domain * ex_client;
86 int ex_flags;
87 struct vfsmount * ex_mnt;
88 struct dentry * ex_dentry;
89 char * ex_path;
90 uid_t ex_anon_uid;
91 gid_t ex_anon_gid;
92 int ex_fsid;
93 unsigned char * ex_uuid; /* 16 byte fsid */
94 struct nfsd4_fs_locations ex_fslocs;
95 int ex_nflavors;
96 struct exp_flavor_info ex_flavors[MAX_SECINFO_LIST];
97};
98
99/* an "export key" (expkey) maps a filehandlefragement to an
100 * svc_export for a given client. There can be several per export,
101 * for the different fsid types.
102 */
103struct svc_expkey {
104 struct cache_head h;
105
106 struct auth_domain * ek_client;
107 int ek_fsidtype;
108 u32 ek_fsid[6];
109
110 struct vfsmount * ek_mnt;
111 struct dentry * ek_dentry;
112};
113
114#define EX_SECURE(exp) (!((exp)->ex_flags & NFSEXP_INSECURE_PORT))
115#define EX_ISSYNC(exp) (!((exp)->ex_flags & NFSEXP_ASYNC))
116#define EX_NOHIDE(exp) ((exp)->ex_flags & NFSEXP_NOHIDE)
117#define EX_WGATHER(exp) ((exp)->ex_flags & NFSEXP_GATHERED_WRITES)
118
119int nfsexp_flags(struct svc_rqst *rqstp, struct svc_export *exp);
120__be32 check_nfsd_access(struct svc_export *exp, struct svc_rqst *rqstp);
121
122/*
123 * Function declarations
124 */
125void nfsd_export_init(void);
126void nfsd_export_shutdown(void);
127void nfsd_export_flush(void);
128void exp_readlock(void);
129void exp_readunlock(void);
130struct svc_export * rqst_exp_get_by_name(struct svc_rqst *,
131 struct vfsmount *,
132 struct dentry *);
133struct svc_export * rqst_exp_parent(struct svc_rqst *,
134 struct vfsmount *mnt,
135 struct dentry *dentry);
136int exp_rootfh(struct auth_domain *,
137 char *path, struct knfsd_fh *, int maxsize);
138__be32 exp_pseudoroot(struct svc_rqst *, struct svc_fh *);
139__be32 nfserrno(int errno);
140
141extern struct cache_detail svc_export_cache;
142
143static inline void exp_put(struct svc_export *exp)
144{
145 cache_put(&exp->h, &svc_export_cache);
146}
147
148static inline void exp_get(struct svc_export *exp)
149{
150 cache_get(&exp->h);
151}
152struct svc_export * rqst_exp_find(struct svc_rqst *, int, u32 *);
153
154#endif /* __KERNEL__ */
155
156#endif /* NFSD_EXPORT_H */
157