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
  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         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  */
  68 struct 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
  82 int 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  */
  88 int                     nfsd_export_init(struct net *);
  89 void                    nfsd_export_shutdown(struct net *);
  90 void                    nfsd_export_flush(struct net *);
  91 struct svc_export *     rqst_exp_get_by_name(struct svc_rqst *,
  92                                              struct path *);
  93 struct svc_export *     rqst_exp_parent(struct svc_rqst *,
  94                                         struct path *);
  95 struct svc_export *     rqst_find_fsidzero_export(struct svc_rqst *);
  96 int                     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
 101 static inline void exp_put(struct svc_export *exp)
 102 {
 103         cache_put(&exp->h, exp->cd);
 104 }
 105
 106 static inline struct svc_export *exp_get(struct svc_export *exp)
 107 {
 108         cache_get(&exp->h);
 109         return exp;
 110 }
 111 struct svc_export * rqst_exp_find(struct svc_rqst *, int, u32 *);
 112
 113 #endif /* NFSD_EXPORT_H */