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TOMOYO Linux Cross Reference
Linux/fs/nfsd/export.h

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  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 #include <linux/nfs4.h>
 10 
 11 struct knfsd_fh;
 12 struct svc_fh;
 13 struct svc_rqst;
 14 
 15 /*
 16  * FS Locations
 17  */
 18 
 19 #define MAX_FS_LOCATIONS        128
 20 
 21 struct nfsd4_fs_location {
 22         char *hosts; /* colon separated list of hosts */
 23         char *path;  /* slash separated list of path components */
 24 };
 25 
 26 struct nfsd4_fs_locations {
 27         uint32_t locations_count;
 28         struct nfsd4_fs_location *locations;
 29 /* If we're not actually serving this data ourselves (only providing a
 30  * list of replicas that do serve it) then we set "migrated": */
 31         int migrated;
 32 };
 33 
 34 /*
 35  * We keep an array of pseudoflavors with the export, in order from most
 36  * to least preferred.  For the foreseeable future, we don't expect more
 37  * than the eight pseudoflavors null, unix, krb5, krb5i, krb5p, skpm3,
 38  * spkm3i, and spkm3p (and using all 8 at once should be rare).
 39  */
 40 #define MAX_SECINFO_LIST        8
 41 #define EX_UUID_LEN             16
 42 
 43 struct exp_flavor_info {
 44         u32     pseudoflavor;
 45         u32     flags;
 46 };
 47 
 48 struct svc_export {
 49         struct cache_head       h;
 50         struct auth_domain *    ex_client;
 51         int                     ex_flags;
 52         struct path             ex_path;
 53         kuid_t                  ex_anon_uid;
 54         kgid_t                  ex_anon_gid;
 55         int                     ex_fsid;
 56         unsigned char *         ex_uuid; /* 16 byte fsid */
 57         struct nfsd4_fs_locations ex_fslocs;
 58         uint32_t                ex_nflavors;
 59         struct exp_flavor_info  ex_flavors[MAX_SECINFO_LIST];
 60         u32                     ex_layout_types;
 61         struct nfsd4_deviceid_map *ex_devid_map;
 62         struct cache_detail     *cd;
 63 };
 64 
 65 /* an "export key" (expkey) maps a filehandlefragement to an
 66  * svc_export for a given client.  There can be several per export,
 67  * for the different fsid types.
 68  */
 69 struct svc_expkey {
 70         struct cache_head       h;
 71 
 72         struct auth_domain *    ek_client;
 73         int                     ek_fsidtype;
 74         u32                     ek_fsid[6];
 75 
 76         struct path             ek_path;
 77 };
 78 
 79 #define EX_ISSYNC(exp)          (!((exp)->ex_flags & NFSEXP_ASYNC))
 80 #define EX_NOHIDE(exp)          ((exp)->ex_flags & NFSEXP_NOHIDE)
 81 #define EX_WGATHER(exp)         ((exp)->ex_flags & NFSEXP_GATHERED_WRITES)
 82 
 83 int nfsexp_flags(struct svc_rqst *rqstp, struct svc_export *exp);
 84 __be32 check_nfsd_access(struct svc_export *exp, struct svc_rqst *rqstp);
 85 
 86 /*
 87  * Function declarations
 88  */
 89 int                     nfsd_export_init(struct net *);
 90 void                    nfsd_export_shutdown(struct net *);
 91 void                    nfsd_export_flush(struct net *);
 92 struct svc_export *     rqst_exp_get_by_name(struct svc_rqst *,
 93                                              struct path *);
 94 struct svc_export *     rqst_exp_parent(struct svc_rqst *,
 95                                         struct path *);
 96 struct svc_export *     rqst_find_fsidzero_export(struct svc_rqst *);
 97 int                     exp_rootfh(struct net *, struct auth_domain *,
 98                                         char *path, struct knfsd_fh *, int maxsize);
 99 __be32                  exp_pseudoroot(struct svc_rqst *, struct svc_fh *);
100 __be32                  nfserrno(int errno);
101 
102 static inline void exp_put(struct svc_export *exp)
103 {
104         cache_put(&exp->h, exp->cd);
105 }
106 
107 static inline struct svc_export *exp_get(struct svc_export *exp)
108 {
109         cache_get(&exp->h);
110         return exp;
111 }
112 struct svc_export * rqst_exp_find(struct svc_rqst *, int, u32 *);
113 
114 #endif /* NFSD_EXPORT_H */
115 

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