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export.h
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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 <[email protected]>
8  */
9 #ifndef NFSD_EXPORT_H
10 #define NFSD_EXPORT_H
11 
12 # include <linux/nfsd/nfsfh.h>
13 #include <uapi/linux/nfsd/export.h>
14 
15 /*
16  * FS Locations
17  */
18 
19 #define MAX_FS_LOCATIONS 128
20 
21 struct nfsd4_fs_location {
22  char *hosts; /* colon separated list of hosts */
23  char *path; /* slash separated list of path components */
24 };
25 
26 struct nfsd4_fs_locations {
27  uint32_t locations_count;
28  struct nfsd4_fs_location *locations;
29 /* If we're not actually serving this data ourselves (only providing a
30  * list of replicas that do serve it) then we set "migrated": */
31  int migrated;
32 };
33 
34 /*
35  * We keep an array of pseudoflavors with the export, in order from most
36  * to least preferred. For the foreseeable future, we don't expect more
37  * than the eight pseudoflavors null, unix, krb5, krb5i, krb5p, skpm3,
38  * spkm3i, and spkm3p (and using all 8 at once should be rare).
39  */
40 #define MAX_SECINFO_LIST 8
41 
42 struct exp_flavor_info {
43  u32 pseudoflavor;
44  u32 flags;
45 };
46 
47 struct svc_export {
48  struct cache_head h;
49  struct auth_domain * ex_client;
50  int ex_flags;
51  struct path ex_path;
52  uid_t ex_anon_uid;
53  gid_t ex_anon_gid;
54  int ex_fsid;
55  unsigned char * ex_uuid; /* 16 byte fsid */
56  struct nfsd4_fs_locations ex_fslocs;
57  int ex_nflavors;
58  struct exp_flavor_info ex_flavors[MAX_SECINFO_LIST];
59  struct cache_detail *cd;
60 };
61 
62 /* an "export key" (expkey) maps a filehandlefragement to an
63  * svc_export for a given client. There can be several per export,
64  * for the different fsid types.
65  */
66 struct svc_expkey {
67  struct cache_head h;
68 
69  struct auth_domain * ek_client;
70  int ek_fsidtype;
71  u32 ek_fsid[6];
72 
73  struct path ek_path;
74 };
75 
76 #define EX_ISSYNC(exp) (!((exp)->ex_flags & NFSEXP_ASYNC))
77 #define EX_NOHIDE(exp) ((exp)->ex_flags & NFSEXP_NOHIDE)
78 #define EX_WGATHER(exp) ((exp)->ex_flags & NFSEXP_GATHERED_WRITES)
79 
80 int nfsexp_flags(struct svc_rqst *rqstp, struct svc_export *exp);
81 __be32 check_nfsd_access(struct svc_export *exp, struct svc_rqst *rqstp);
82 
83 /*
84  * Function declarations
85  */
86 int nfsd_export_init(struct net *);
87 void nfsd_export_shutdown(struct net *);
88 void nfsd_export_flush(struct net *);
89 struct svc_export * rqst_exp_get_by_name(struct svc_rqst *,
90  struct path *);
91 struct svc_export * rqst_exp_parent(struct svc_rqst *,
92  struct path *);
93 struct svc_export * rqst_find_fsidzero_export(struct svc_rqst *);
94 int exp_rootfh(struct net *, struct auth_domain *,
95  char *path, struct knfsd_fh *, int maxsize);
96 __be32 exp_pseudoroot(struct svc_rqst *, struct svc_fh *);
97 __be32 nfserrno(int errno);
98 
99 static inline void exp_put(struct svc_export *exp)
100 {
101  cache_put(&exp->h, exp->cd);
102 }
103 
104 static inline void exp_get(struct svc_export *exp)
105 {
106  cache_get(&exp->h);
107 }
108 struct svc_export * rqst_exp_find(struct svc_rqst *, int, u32 *);
109 
110 #endif /* NFSD_EXPORT_H */
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