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 <linux/percpu_counter.h>
  10 #include <uapi/linux/nfsd/export.h>
  11 #include <linux/nfs4.h>
  12
  13 struct knfsd_fh;
  14 struct svc_fh;
  15 struct svc_rqst;
  16
  17 /*
  18  * FS Locations
  19  */
  20
  21 #define MAX_FS_LOCATIONS        128
  22
  23 struct nfsd4_fs_location {
  24         char *hosts; /* colon separated list of hosts */
  25         char *path;  /* slash separated list of path components */
  26 };
  27
  28 struct nfsd4_fs_locations {
  29         uint32_t locations_count;
  30         struct nfsd4_fs_location *locations;
  31 /* If we're not actually serving this data ourselves (only providing a
  32  * list of replicas that do serve it) then we set "migrated": */
  33         int migrated;
  34 };
  35
  36 /*
  37  * We keep an array of pseudoflavors with the export, in order from most
  38  * to least preferred.  For the foreseeable future, we don't expect more
  39  * than the eight pseudoflavors null, unix, krb5, krb5i, krb5p, skpm3,
  40  * spkm3i, and spkm3p (and using all 8 at once should be rare).
  41  */
  42 #define MAX_SECINFO_LIST        8
  43 #define EX_UUID_LEN             16
  44
  45 struct exp_flavor_info {
  46         u32     pseudoflavor;
  47         u32     flags;
  48 };
  49
  50 /* Per-export stats */
  51 enum {
  52         EXP_STATS_FH_STALE,
  53         EXP_STATS_IO_READ,
  54         EXP_STATS_IO_WRITE,
  55         EXP_STATS_COUNTERS_NUM
  56 };
  57
  58 struct export_stats {
  59         time64_t                start_time;
  60         struct percpu_counter   counter[EXP_STATS_COUNTERS_NUM];
  61 };
  62
  63 struct svc_export {
  64         struct cache_head       h;
  65         struct auth_domain *    ex_client;
  66         int                     ex_flags;
  67         struct path             ex_path;
  68         kuid_t                  ex_anon_uid;
  69         kgid_t                  ex_anon_gid;
  70         int                     ex_fsid;
  71         unsigned char *         ex_uuid; /* 16 byte fsid */
  72         struct nfsd4_fs_locations ex_fslocs;
  73         uint32_t                ex_nflavors;
  74         struct exp_flavor_info  ex_flavors[MAX_SECINFO_LIST];
  75         u32                     ex_layout_types;
  76         struct nfsd4_deviceid_map *ex_devid_map;
  77         struct cache_detail     *cd;
  78         struct rcu_head         ex_rcu;
  79         struct export_stats     ex_stats;
  80 };
  81
  82 /* an "export key" (expkey) maps a filehandlefragement to an
  83  * svc_export for a given client.  There can be several per export,
  84  * for the different fsid types.
  85  */
  86 struct svc_expkey {
  87         struct cache_head       h;
  88
  89         struct auth_domain *    ek_client;
  90         int                     ek_fsidtype;
  91         u32                     ek_fsid[6];
  92
  93         struct path             ek_path;
  94         struct rcu_head         ek_rcu;
  95 };
  96
  97 #define EX_ISSYNC(exp)          (!((exp)->ex_flags & NFSEXP_ASYNC))
  98 #define EX_NOHIDE(exp)          ((exp)->ex_flags & NFSEXP_NOHIDE)
  99 #define EX_WGATHER(exp)         ((exp)->ex_flags & NFSEXP_GATHERED_WRITES)
 100
 101 int nfsexp_flags(struct svc_rqst *rqstp, struct svc_export *exp);
 102 __be32 check_nfsd_access(struct svc_export *exp, struct svc_rqst *rqstp);
 103
 104 /*
 105  * Function declarations
 106  */
 107 int                     nfsd_export_init(struct net *);
 108 void                    nfsd_export_shutdown(struct net *);
 109 void                    nfsd_export_flush(struct net *);
 110 struct svc_export *     rqst_exp_get_by_name(struct svc_rqst *,
 111                                              struct path *);
 112 struct svc_export *     rqst_exp_parent(struct svc_rqst *,
 113                                         struct path *);
 114 struct svc_export *     rqst_find_fsidzero_export(struct svc_rqst *);
 115 int                     exp_rootfh(struct net *, struct auth_domain *,
 116                                         char *path, struct knfsd_fh *, int maxsize);
 117 __be32                  exp_pseudoroot(struct svc_rqst *, struct svc_fh *);
 118 __be32                  nfserrno(int errno);
 119
 120 static inline void exp_put(struct svc_export *exp)
 121 {
 122         cache_put(&exp->h, exp->cd);
 123 }
 124
 125 static inline struct svc_export *exp_get(struct svc_export *exp)
 126 {
 127         cache_get(&exp->h);
 128         return exp;
 129 }
 130 struct svc_export * rqst_exp_find(struct svc_rqst *, int, u32 *);
 131
 132 #endif /* NFSD_EXPORT_H */