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 <linux/percpu_counter.h>
10 #include <uapi/linux/nfsd/export.h>
11 #include <linux/nfs4.h>
12
13 struct knfsd_fh;
14 struct svc_fh;
15 struct svc_rqst;
16
17 /*
18 * FS Locations
19 */
20
21 #define MAX_FS_LOCATIONS 128
22
23 struct nfsd4_fs_location {
24 char *hosts; /* colon separated list of hosts */
25 char *path; /* slash separated list of path components */
26 };
27
28 struct nfsd4_fs_locations {
29 uint32_t locations_count;
30 struct nfsd4_fs_location *locations;
31 /* If we're not actually serving this data ourselves (only providing a
32 * list of replicas that do serve it) then we set "migrated": */
33 int migrated;
34 };
35
36 /*
37 * We keep an array of pseudoflavors with the export, in order from most
38 * to least preferred. For the foreseeable future, we don't expect more
39 * than the eight pseudoflavors null, unix, krb5, krb5i, krb5p, skpm3,
40 * spkm3i, and spkm3p (and using all 8 at once should be rare).
41 */
42 #define MAX_SECINFO_LIST 8
43 #define EX_UUID_LEN 16
44
45 struct exp_flavor_info {
46 u32 pseudoflavor;
47 u32 flags;
48 };
49
50 /* Per-export stats */
51 enum {
52 EXP_STATS_FH_STALE,
53 EXP_STATS_IO_READ,
54 EXP_STATS_IO_WRITE,
55 EXP_STATS_COUNTERS_NUM
56 };
57
58 struct export_stats {
59 time64_t start_time;
60 struct percpu_counter counter[EXP_STATS_COUNTERS_NUM];
61 };
62
63 struct svc_export {
64 struct cache_head h;
65 struct auth_domain * ex_client;
66 int ex_flags;
67 int ex_fsid;
68 struct path ex_path;
69 kuid_t ex_anon_uid;
70 kgid_t ex_anon_gid;
71 unsigned char * ex_uuid; /* 16 byte fsid */
72 struct nfsd4_fs_locations ex_fslocs;
73 uint32_t ex_nflavors;
74 struct exp_flavor_info ex_flavors[MAX_SECINFO_LIST];
75 u32 ex_layout_types;
76 struct nfsd4_deviceid_map *ex_devid_map;
77 struct cache_detail *cd;
78 struct rcu_head ex_rcu;
79 unsigned long ex_xprtsec_modes;
80 struct export_stats *ex_stats;
81 };
82
83 /* an "export key" (expkey) maps a filehandlefragement to an
84 * svc_export for a given client. There can be several per export,
85 * for the different fsid types.
86 */
87 struct svc_expkey {
88 struct cache_head h;
89
90 struct auth_domain * ek_client;
91 int ek_fsidtype;
92 u32 ek_fsid[6];
93
94 struct path ek_path;
95 struct rcu_head ek_rcu;
96 };
97
98 #define EX_ISSYNC(exp) (!((exp)->ex_flags & NFSEXP_ASYNC))
99 #define EX_NOHIDE(exp) ((exp)->ex_flags & NFSEXP_NOHIDE)
100 #define EX_WGATHER(exp) ((exp)->ex_flags & NFSEXP_GATHERED_WRITES)
101
102 int nfsexp_flags(struct svc_rqst *rqstp, struct svc_export *exp);
103 __be32 check_nfsd_access(struct svc_export *exp, struct svc_rqst *rqstp);
104
105 /*
106 * Function declarations
107 */
108 int nfsd_export_init(struct net *);
109 void nfsd_export_shutdown(struct net *);
110 void nfsd_export_flush(struct net *);
111 struct svc_export * rqst_exp_get_by_name(struct svc_rqst *,
112 struct path *);
113 struct svc_export * rqst_exp_parent(struct svc_rqst *,
114 struct path *);
115 struct svc_export * rqst_find_fsidzero_export(struct svc_rqst *);
116 int exp_rootfh(struct net *, struct auth_domain *,
117 char *path, struct knfsd_fh *, int maxsize);
118 __be32 exp_pseudoroot(struct svc_rqst *, struct svc_fh *);
119
120 static inline void exp_put(struct svc_export *exp)
121 {
122 cache_put(&exp->h, exp->cd);
123 }
124
125 static inline struct svc_export *exp_get(struct svc_export *exp)
126 {
127 cache_get(&exp->h);
128 return exp;
129 }
130 struct svc_export * rqst_exp_find(struct svc_rqst *, int, u32 *);
131
132 #endif /* NFSD_EXPORT_H */
133
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