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
  10 #ifndef NFSD_EXPORT_H
  11 #define NFSD_EXPORT_H
  12
  13 #include <asm/types.h>
  14 #ifdef __KERNEL__
  15 # include <linux/types.h>
  16 # include <linux/in.h>
  17 #endif
  18
  19 /*
  20  * Important limits for the exports stuff.
  21  */
  22 #define NFSCLNT_IDMAX           1024
  23 #define NFSCLNT_ADDRMAX         16
  24 #define NFSCLNT_KEYMAX          32
  25
  26 /*
  27  * Export flags.
  28  */
  29 #define NFSEXP_READONLY         0x0001
  30 #define NFSEXP_INSECURE_PORT    0x0002
  31 #define NFSEXP_ROOTSQUASH       0x0004
  32 #define NFSEXP_ALLSQUASH        0x0008
  33 #define NFSEXP_ASYNC            0x0010
  34 #define NFSEXP_GATHERED_WRITES  0x0020
  35 /* 40 80 100 currently unused */
  36 #define NFSEXP_NOHIDE           0x0200
  37 #define NFSEXP_NOSUBTREECHECK   0x0400
  38 #define NFSEXP_NOAUTHNLM        0x0800          /* Don't authenticate NLM requests - just trust */
  39 #define NFSEXP_MSNFS            0x1000  /* do silly things that MS clients expect */
  40 #define NFSEXP_FSID             0x2000
  41 #define NFSEXP_CROSSMOUNT       0x4000
  42 #define NFSEXP_NOACL            0x8000  /* reserved for possible ACL related use */
  43 #define NFSEXP_ALLFLAGS         0xFE3F
  44
  45
  46 #ifdef __KERNEL__
  47
  48 /*
  49  * FS Locations
  50  */
  51
  52 #define MAX_FS_LOCATIONS        128
  53
  54 struct nfsd4_fs_location {
  55         char *hosts; /* colon separated list of hosts */
  56         char *path;  /* slash separated list of path components */
  57 };
  58
  59 struct nfsd4_fs_locations {
  60         uint32_t locations_count;
  61         struct nfsd4_fs_location *locations;
  62 /* If we're not actually serving this data ourselves (only providing a
  63  * list of replicas that do serve it) then we set "migrated": */
  64         int migrated;
  65 };
  66
  67 struct svc_export {
  68         struct cache_head       h;
  69         struct auth_domain *    ex_client;
  70         int                     ex_flags;
  71         struct vfsmount *       ex_mnt;
  72         struct dentry *         ex_dentry;
  73         char *                  ex_path;
  74         uid_t                   ex_anon_uid;
  75         gid_t                   ex_anon_gid;
  76         int                     ex_fsid;
  77         struct nfsd4_fs_locations ex_fslocs;
  78 };
  79
  80 /* an "export key" (expkey) maps a filehandlefragement to an
  81  * svc_export for a given client.  There can be two per export, one
  82  * for type 0 (dev/ino), one for type 1 (fsid)
  83  */
  84 struct svc_expkey {
  85         struct cache_head       h;
  86
  87         struct auth_domain *    ek_client;
  88         int                     ek_fsidtype;
  89         u32                     ek_fsid[3];
  90
  91         struct vfsmount *       ek_mnt;
  92         struct dentry *         ek_dentry;
  93 };
  94
  95 #define EX_SECURE(exp)          (!((exp)->ex_flags & NFSEXP_INSECURE_PORT))
  96 #define EX_ISSYNC(exp)          (!((exp)->ex_flags & NFSEXP_ASYNC))
  97 #define EX_RDONLY(exp)          ((exp)->ex_flags & NFSEXP_READONLY)
  98 #define EX_NOHIDE(exp)          ((exp)->ex_flags & NFSEXP_NOHIDE)
  99 #define EX_WGATHER(exp)         ((exp)->ex_flags & NFSEXP_GATHERED_WRITES)
 100
 101
 102 /*
 103  * Function declarations
 104  */
 105 void                    nfsd_export_init(void);
 106 void                    nfsd_export_shutdown(void);
 107 void                    nfsd_export_flush(void);
 108 void                    exp_readlock(void);
 109 void                    exp_readunlock(void);
 110 struct svc_export *     exp_get_by_name(struct auth_domain *clp,
 111                                         struct vfsmount *mnt,
 112                                         struct dentry *dentry,
 113                                         struct cache_req *reqp);
 114 struct svc_export *     exp_parent(struct auth_domain *clp,
 115                                    struct vfsmount *mnt,
 116                                    struct dentry *dentry,
 117                                    struct cache_req *reqp);
 118 int                     exp_rootfh(struct auth_domain *,
 119                                         char *path, struct knfsd_fh *, int maxsize);
 120 __be32                  exp_pseudoroot(struct auth_domain *, struct svc_fh *fhp, struct cache_req *creq);
 121 __be32                  nfserrno(int errno);
 122
 123 extern struct cache_detail svc_export_cache;
 124
 125 static inline void exp_put(struct svc_export *exp)
 126 {
 127         cache_put(&exp->h, &svc_export_cache);
 128 }
 129
 130 static inline void exp_get(struct svc_export *exp)
 131 {
 132         cache_get(&exp->h);
 133 }
 134 extern struct svc_export *
 135 exp_find(struct auth_domain *clp, int fsid_type, u32 *fsidv,
 136          struct cache_req *reqp);
 137
 138 #endif /* __KERNEL__ */
 139
 140 #endif /* NFSD_EXPORT_H */
 141