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 };
65 
66 /* an "export key" (expkey) maps a filehandlefragement to an
67  * svc_export for a given client.  There can be several per export,
68  * for the different fsid types.
69  */
70 struct svc_expkey {
71 	struct cache_head	h;
72 
73 	struct auth_domain *	ek_client;
74 	int			ek_fsidtype;
75 	u32			ek_fsid[6];
76 
77 	struct path		ek_path;
78 };
79 
80 #define EX_ISSYNC(exp)		(!((exp)->ex_flags & NFSEXP_ASYNC))
81 #define EX_NOHIDE(exp)		((exp)->ex_flags & NFSEXP_NOHIDE)
82 #define EX_WGATHER(exp)		((exp)->ex_flags & NFSEXP_GATHERED_WRITES)
83 
84 int nfsexp_flags(struct svc_rqst *rqstp, struct svc_export *exp);
85 __be32 check_nfsd_access(struct svc_export *exp, struct svc_rqst *rqstp);
86 
87 /*
88  * Function declarations
89  */
90 int			nfsd_export_init(struct net *);
91 void			nfsd_export_shutdown(struct net *);
92 void			nfsd_export_flush(struct net *);
93 struct svc_export *	rqst_exp_get_by_name(struct svc_rqst *,
94 					     struct path *);
95 struct svc_export *	rqst_exp_parent(struct svc_rqst *,
96 					struct path *);
97 struct svc_export *	rqst_find_fsidzero_export(struct svc_rqst *);
98 int			exp_rootfh(struct net *, struct auth_domain *,
99 					char *path, struct knfsd_fh *, int maxsize);
100 __be32			exp_pseudoroot(struct svc_rqst *, struct svc_fh *);
101 __be32			nfserrno(int errno);
102 
exp_put(struct svc_export * exp)103 static inline void exp_put(struct svc_export *exp)
104 {
105 	cache_put(&exp->h, exp->cd);
106 }
107 
exp_get(struct svc_export * exp)108 static inline struct svc_export *exp_get(struct svc_export *exp)
109 {
110 	cache_get(&exp->h);
111 	return exp;
112 }
113 struct svc_export * rqst_exp_find(struct svc_rqst *, int, u32 *);
114 
115 #endif /* NFSD_EXPORT_H */
116