xref: /openbmc/linux/fs/nfsd/export.h (revision 33ac9dba)
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  
10  struct knfsd_fh;
11  struct svc_fh;
12  struct svc_rqst;
13  
14  /*
15   * FS Locations
16   */
17  
18  #define MAX_FS_LOCATIONS	128
19  
20  struct nfsd4_fs_location {
21  	char *hosts; /* colon separated list of hosts */
22  	char *path;  /* slash separated list of path components */
23  };
24  
25  struct 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  
42  struct exp_flavor_info {
43  	u32	pseudoflavor;
44  	u32	flags;
45  };
46  
47  struct 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  	struct cache_detail	*cd;
60  };
61  
62  /* an "export key" (expkey) maps a filehandlefragement to an
63   * svc_export for a given client.  There can be several per export,
64   * for the different fsid types.
65   */
66  struct svc_expkey {
67  	struct cache_head	h;
68  
69  	struct auth_domain *	ek_client;
70  	int			ek_fsidtype;
71  	u32			ek_fsid[6];
72  
73  	struct path		ek_path;
74  };
75  
76  #define EX_ISSYNC(exp)		(!((exp)->ex_flags & NFSEXP_ASYNC))
77  #define EX_NOHIDE(exp)		((exp)->ex_flags & NFSEXP_NOHIDE)
78  #define EX_WGATHER(exp)		((exp)->ex_flags & NFSEXP_GATHERED_WRITES)
79  
80  int nfsexp_flags(struct svc_rqst *rqstp, struct svc_export *exp);
81  __be32 check_nfsd_access(struct svc_export *exp, struct svc_rqst *rqstp);
82  
83  /*
84   * Function declarations
85   */
86  int			nfsd_export_init(struct net *);
87  void			nfsd_export_shutdown(struct net *);
88  void			nfsd_export_flush(struct net *);
89  struct svc_export *	rqst_exp_get_by_name(struct svc_rqst *,
90  					     struct path *);
91  struct svc_export *	rqst_exp_parent(struct svc_rqst *,
92  					struct path *);
93  struct svc_export *	rqst_find_fsidzero_export(struct svc_rqst *);
94  int			exp_rootfh(struct net *, struct auth_domain *,
95  					char *path, struct knfsd_fh *, int maxsize);
96  __be32			exp_pseudoroot(struct svc_rqst *, struct svc_fh *);
97  __be32			nfserrno(int errno);
98  
99  static inline void exp_put(struct svc_export *exp)
100  {
101  	cache_put(&exp->h, exp->cd);
102  }
103  
104  static inline struct svc_export *exp_get(struct svc_export *exp)
105  {
106  	cache_get(&exp->h);
107  	return exp;
108  }
109  struct svc_export * rqst_exp_find(struct svc_rqst *, int, u32 *);
110  
111  #endif /* NFSD_EXPORT_H */
112