summaryrefslogtreecommitdiff
path: root/include/linux/nfsd/export.h
blob: 1ba53e524749f018aa83a6b1e0a753d907d4cd61 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
/*
 * include/linux/nfsd/export.h
 * 
 * Public declarations for NFS exports. The definitions for the
 * syscall interface are in nfsctl.h
 *
 * Copyright (C) 1995-1997 Olaf Kirch <okir@monad.swb.de>
 */

#ifndef NFSD_EXPORT_H
#define NFSD_EXPORT_H

#include <asm/types.h>
#ifdef __KERNEL__
# include <linux/types.h>
# include <linux/in.h>
#endif

/*
 * Important limits for the exports stuff.
 */
#define NFSCLNT_IDMAX		1024
#define NFSCLNT_ADDRMAX		16
#define NFSCLNT_KEYMAX		32

/*
 * Export flags.
 */
#define NFSEXP_READONLY		0x0001
#define NFSEXP_INSECURE_PORT	0x0002
#define NFSEXP_ROOTSQUASH	0x0004
#define NFSEXP_ALLSQUASH	0x0008
#define NFSEXP_ASYNC		0x0010
#define NFSEXP_GATHERED_WRITES	0x0020
/* 40 80 100 currently unused */
#define NFSEXP_NOHIDE		0x0200
#define NFSEXP_NOSUBTREECHECK	0x0400
#define	NFSEXP_NOAUTHNLM	0x0800		/* Don't authenticate NLM requests - just trust */
#define NFSEXP_MSNFS		0x1000	/* do silly things that MS clients expect */
#define NFSEXP_FSID		0x2000
#define	NFSEXP_CROSSMOUNT	0x4000
#define	NFSEXP_NOACL		0x8000	/* reserved for possible ACL related use */
#define NFSEXP_ALLFLAGS		0xFE3F

/* The flags that may vary depending on security flavor: */
#define NFSEXP_SECINFO_FLAGS	0

#ifdef __KERNEL__

/*
 * FS Locations
 */

#define MAX_FS_LOCATIONS	128

struct nfsd4_fs_location {
	char *hosts; /* colon separated list of hosts */
	char *path;  /* slash separated list of path components */
};

struct nfsd4_fs_locations {
	uint32_t locations_count;
	struct nfsd4_fs_location *locations;
/* If we're not actually serving this data ourselves (only providing a
 * list of replicas that do serve it) then we set "migrated": */
	int migrated;
};

/*
 * We keep an array of pseudoflavors with the export, in order from most
 * to least preferred.  For the forseeable future, we don't expect more
 * than the eight pseudoflavors null, unix, krb5, krb5i, krb5p, skpm3,
 * spkm3i, and spkm3p (and using all 8 at once should be rare).
 */
#define MAX_SECINFO_LIST	8

struct exp_flavor_info {
	u32	pseudoflavor;
	u32	flags;
};

struct svc_export {
	struct cache_head	h;
	struct auth_domain *	ex_client;
	int			ex_flags;
	struct vfsmount *	ex_mnt;
	struct dentry *		ex_dentry;
	char *			ex_path;
	uid_t			ex_anon_uid;
	gid_t			ex_anon_gid;
	int			ex_fsid;
	unsigned char *		ex_uuid; /* 16 byte fsid */
	struct nfsd4_fs_locations ex_fslocs;
	int			ex_nflavors;
	struct exp_flavor_info	ex_flavors[MAX_SECINFO_LIST];
};

/* an "export key" (expkey) maps a filehandlefragement to an
 * svc_export for a given client.  There can be several per export,
 * for the different fsid types.
 */
struct svc_expkey {
	struct cache_head	h;

	struct auth_domain *	ek_client;
	int			ek_fsidtype;
	u32			ek_fsid[6];

	struct vfsmount *	ek_mnt;
	struct dentry *		ek_dentry;
};

#define EX_SECURE(exp)		(!((exp)->ex_flags & NFSEXP_INSECURE_PORT))
#define EX_ISSYNC(exp)		(!((exp)->ex_flags & NFSEXP_ASYNC))
#define EX_RDONLY(exp)		((exp)->ex_flags & NFSEXP_READONLY)
#define EX_NOHIDE(exp)		((exp)->ex_flags & NFSEXP_NOHIDE)
#define EX_WGATHER(exp)		((exp)->ex_flags & NFSEXP_GATHERED_WRITES)


/*
 * Function declarations
 */
void			nfsd_export_init(void);
void			nfsd_export_shutdown(void);
void			nfsd_export_flush(void);
void			exp_readlock(void);
void			exp_readunlock(void);
struct svc_export *	exp_get_by_name(struct auth_domain *clp,
					struct vfsmount *mnt,
					struct dentry *dentry,
					struct cache_req *reqp);
struct svc_export *	rqst_exp_get_by_name(struct svc_rqst *,
					     struct vfsmount *,
					     struct dentry *);
struct svc_export *	exp_parent(struct auth_domain *clp,
				   struct vfsmount *mnt,
				   struct dentry *dentry,
				   struct cache_req *reqp);
struct svc_export *	rqst_exp_parent(struct svc_rqst *,
					struct vfsmount *mnt,
					struct dentry *dentry);
int			exp_rootfh(struct auth_domain *, 
					char *path, struct knfsd_fh *, int maxsize);
__be32			exp_pseudoroot(struct svc_rqst *, struct svc_fh *);
__be32			nfserrno(int errno);

extern struct cache_detail svc_export_cache;

static inline void exp_put(struct svc_export *exp)
{
	cache_put(&exp->h, &svc_export_cache);
}

static inline void exp_get(struct svc_export *exp)
{
	cache_get(&exp->h);
}
extern struct svc_export *
exp_find(struct auth_domain *clp, int fsid_type, u32 *fsidv,
	 struct cache_req *reqp);
struct svc_export * rqst_exp_find(struct svc_rqst *, int, u32 *);

#endif /* __KERNEL__ */

#endif /* NFSD_EXPORT_H */