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(h: &exp->h, cd: exp->cd); |
123 | } |
124 | |
125 | static inline struct svc_export *exp_get(struct svc_export *exp) |
126 | { |
127 | cache_get(h: &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 | |