fs/nfsd/export.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * Copyright (C) 1995-1997 Olaf Kirch <okir@monad.swb.de>
   4  */
   5 #ifndef NFSD_EXPORT_H
   6 #define NFSD_EXPORT_H
   7
   8 #include <linux/sunrpc/cache.h>
   9 #include <uapi/linux/nfsd/export.h>
  10 #include <linux/nfs4.h>
  11
  12 struct knfsd_fh;
  13 struct svc_fh;
  14 struct svc_rqst;
  15
  16 /*
  17  * FS Locations
  18  */
  19
  20 #define MAX_FS_LOCATIONS        128
  21
  22 struct nfsd4_fs_location {
  23         char *hosts; /* colon separated list of hosts */
  24         char *path;  /* slash separated list of path components */
  25 };
  26
  27 struct nfsd4_fs_locations {
  28         uint32_t locations_count;
  29         struct nfsd4_fs_location *locations;
  30 /* If we're not actually serving this data ourselves (only providing a
  31  * list of replicas that do serve it) then we set "migrated": */
  32         int migrated;
  33 };
  34
  35 /*
  36  * We keep an array of pseudoflavors with the export, in order from most
  37  * to least preferred.  For the foreseeable future, we don't expect more
  38  * than the eight pseudoflavors null, unix, krb5, krb5i, krb5p, skpm3,
  39  * spkm3i, and spkm3p (and using all 8 at once should be rare).
  40  */
  41 #define MAX_SECINFO_LIST        8
  42 #define EX_UUID_LEN             16
  43
  44 struct exp_flavor_info {
  45         u32     pseudoflavor;
  46         u32     flags;
  47 };
  48
  49 struct svc_export {
  50         struct cache_head       h;
  51         struct auth_domain *    ex_client;
  52         int                     ex_flags;
  53         struct path             ex_path;
  54         kuid_t                  ex_anon_uid;
  55         kgid_t                  ex_anon_gid;
  56         int                     ex_fsid;
  57         unsigned char *         ex_uuid; /* 16 byte fsid */
  58         struct nfsd4_fs_locations ex_fslocs;
  59         uint32_t                ex_nflavors;
  60         struct exp_flavor_info  ex_flavors[MAX_SECINFO_LIST];
  61         u32                     ex_layout_types;
  62         struct nfsd4_deviceid_map *ex_devid_map;
  63         struct cache_detail     *cd;
  64         struct rcu_head         ex_rcu;
  65 };
  66
  67 /* an "export key" (expkey) maps a filehandlefragement to an
  68  * svc_export for a given client.  There can be several per export,
  69  * for the different fsid types.
  70  */
  71 struct svc_expkey {
  72         struct cache_head       h;
  73
  74         struct auth_domain *    ek_client;
  75         int                     ek_fsidtype;
  76         u32                     ek_fsid[6];
  77
  78         struct path             ek_path;
  79         struct rcu_head         ek_rcu;
  80 };
  81
  82 #define EX_ISSYNC(exp)          (!((exp)->ex_flags & NFSEXP_ASYNC))
  83 #define EX_NOHIDE(exp)          ((exp)->ex_flags & NFSEXP_NOHIDE)
  84 #define EX_WGATHER(exp)         ((exp)->ex_flags & NFSEXP_GATHERED_WRITES)
  85
  86 int nfsexp_flags(struct svc_rqst *rqstp, struct svc_export *exp);
  87 __be32 check_nfsd_access(struct svc_export *exp, struct svc_rqst *rqstp);
  88
  89 /*
  90  * Function declarations
  91  */
  92 int                     nfsd_export_init(struct net *);
  93 void                    nfsd_export_shutdown(struct net *);
  94 void                    nfsd_export_flush(struct net *);
  95 struct svc_export *     rqst_exp_get_by_name(struct svc_rqst *,
  96                                              struct path *);
  97 struct svc_export *     rqst_exp_parent(struct svc_rqst *,
  98                                         struct path *);
  99 struct svc_export *     rqst_find_fsidzero_export(struct svc_rqst *);
 100 int                     exp_rootfh(struct net *, struct auth_domain *,
 101                                         char *path, struct knfsd_fh *, int maxsize);
 102 __be32                  exp_pseudoroot(struct svc_rqst *, struct svc_fh *);
 103 __be32                  nfserrno(int errno);
 104
 105 static inline void exp_put(struct svc_export *exp)
 106 {
 107         cache_put(&exp->h, exp->cd);
 108 }
 109
 110 static inline struct svc_export *exp_get(struct svc_export *exp)
 111 {
 112         cache_get(&exp->h);
 113         return exp;
 114 }
 115 struct svc_export * rqst_exp_find(struct svc_rqst *, int, u32 *);
 116
 117 #endif /* NFSD_EXPORT_H */