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