xref: /openbmc/linux/fs/nfsd/export.h (revision 9b31d561)
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 
exp_put(struct svc_export * exp)120 static inline void exp_put(struct svc_export *exp)
121 {
122 	cache_put(&exp->h, exp->cd);
123 }
124 
exp_get(struct svc_export * exp)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