1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3 * Copyright (C) 1995-1997 Olaf Kirch <okir@monad.swb.de>
4 */
5 #ifndef NFSD_EXPORT_H
6 #define NFSD_EXPORT_H
7
8 #include <linux/sunrpc/cache.h>
9 #include <uapi/linux/nfsd/export.h>
10 #include <linux/nfs4.h>
11
12 struct knfsd_fh;
13 struct svc_fh;
14 struct svc_rqst;
15
16 /*
17 * FS Locations
18 */
19
20 #define MAX_FS_LOCATIONS 128
21
22 struct nfsd4_fs_location {
23 char *hosts; /* colon separated list of hosts */
24 char *path; /* slash separated list of path components */
25 };
26
27 struct nfsd4_fs_locations {
28 uint32_t locations_count;
29 struct nfsd4_fs_location *locations;
30 /* If we're not actually serving this data ourselves (only providing a
31 * list of replicas that do serve it) then we set "migrated": */
32 int migrated;
33 };
34
35 /*
36 * We keep an array of pseudoflavors with the export, in order from most
37 * to least preferred. For the foreseeable future, we don't expect more
38 * than the eight pseudoflavors null, unix, krb5, krb5i, krb5p, skpm3,
39 * spkm3i, and spkm3p (and using all 8 at once should be rare).
40 */
41 #define MAX_SECINFO_LIST 8
42 #define EX_UUID_LEN 16
43
44 struct exp_flavor_info {
45 u32 pseudoflavor;
46 u32 flags;
47 };
48
49 struct svc_export {
50 struct cache_head h;
51 struct auth_domain * ex_client;
52 int ex_flags;
53 struct path ex_path;
54 kuid_t ex_anon_uid;
55 kgid_t ex_anon_gid;
56 int ex_fsid;
57 unsigned char * ex_uuid; /* 16 byte fsid */
58 struct nfsd4_fs_locations ex_fslocs;
59 uint32_t ex_nflavors;
60 struct exp_flavor_info ex_flavors[MAX_SECINFO_LIST];
61 u32 ex_layout_types;
62 struct nfsd4_deviceid_map *ex_devid_map;
63 struct cache_detail *cd;
64 struct rcu_head ex_rcu;
65 };
66
67 /* an "export key" (expkey) maps a filehandlefragement to an
68 * svc_export for a given client. There can be several per export,
69 * for the different fsid types.
70 */
71 struct svc_expkey {
72 struct cache_head h;
73
74 struct auth_domain * ek_client;
75 int ek_fsidtype;
76 u32 ek_fsid[6];
77
78 struct path ek_path;
79 struct rcu_head ek_rcu;
80 };
81
82 #define EX_ISSYNC(exp) (!((exp)->ex_flags & NFSEXP_ASYNC))
83 #define EX_NOHIDE(exp) ((exp)->ex_flags & NFSEXP_NOHIDE)
84 #define EX_WGATHER(exp) ((exp)->ex_flags & NFSEXP_GATHERED_WRITES)
85
86 int nfsexp_flags(struct svc_rqst *rqstp, struct svc_export *exp);
87 __be32 check_nfsd_access(struct svc_export *exp, struct svc_rqst *rqstp);
88
89 /*
90 * Function declarations
91 */
92 int nfsd_export_init(struct net *);
93 void nfsd_export_shutdown(struct net *);
94 void nfsd_export_flush(struct net *);
95 struct svc_export * rqst_exp_get_by_name(struct svc_rqst *,
96 struct path *);
97 struct svc_export * rqst_exp_parent(struct svc_rqst *,
98 struct path *);
99 struct svc_export * rqst_find_fsidzero_export(struct svc_rqst *);
100 int exp_rootfh(struct net *, struct auth_domain *,
101 char *path, struct knfsd_fh *, int maxsize);
102 __be32 exp_pseudoroot(struct svc_rqst *, struct svc_fh *);
103 __be32 nfserrno(int errno);
104
exp_put(struct svc_export * exp)105 static inline void exp_put(struct svc_export *exp)
106 {
107 cache_put(&exp->h, exp->cd);
108 }
109
exp_get(struct svc_export * exp)110 static inline struct svc_export *exp_get(struct svc_export *exp)
111 {
112 cache_get(&exp->h);
113 return exp;
114 }
115 struct svc_export * rqst_exp_find(struct svc_rqst *, int, u32 *);
116
117 #endif /* NFSD_EXPORT_H */
118
