fs/nfsd/export.h

   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 */