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/nfsd/nfsfh.h>
  13 #include <uapi/linux/nfsd/export.h>
  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
  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         int                     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 void exp_get(struct svc_export *exp)
 105 {
 106         cache_get(&exp->h);
 107 }
 108 struct svc_export * rqst_exp_find(struct svc_rqst *, int, u32 *);
 109
 110 #endif /* NFSD_EXPORT_H */