include/linux/nfsd/export.h

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