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 struct svc_export {
  49         struct cache_head       h;
  50         struct auth_domain *    ex_client;
  51         int                     ex_flags;
  52         struct vfsmount *       ex_mnt;
  53         struct dentry *         ex_dentry;
  54         uid_t                   ex_anon_uid;
  55         gid_t                   ex_anon_gid;
  56         int                     ex_fsid;
  57 };
  58
  59 /* an "export key" (expkey) maps a filehandlefragement to an
  60  * svc_export for a given client.  There can be two per export, one
  61  * for type 0 (dev/ino), one for type 1 (fsid)
  62  */
  63 struct svc_expkey {
  64         struct cache_head       h;
  65
  66         struct auth_domain *    ek_client;
  67         int                     ek_fsidtype;
  68         u32                     ek_fsid[3];
  69
  70         struct svc_export *     ek_export;
  71 };
  72
  73 #define EX_SECURE(exp)          (!((exp)->ex_flags & NFSEXP_INSECURE_PORT))
  74 #define EX_ISSYNC(exp)          (!((exp)->ex_flags & NFSEXP_ASYNC))
  75 #define EX_RDONLY(exp)          ((exp)->ex_flags & NFSEXP_READONLY)
  76 #define EX_NOHIDE(exp)          ((exp)->ex_flags & NFSEXP_NOHIDE)
  77 #define EX_WGATHER(exp)         ((exp)->ex_flags & NFSEXP_GATHERED_WRITES)
  78
  79
  80 /*
  81  * Function declarations
  82  */
  83 void                    nfsd_export_init(void);
  84 void                    nfsd_export_shutdown(void);
  85 void                    nfsd_export_flush(void);
  86 void                    exp_readlock(void);
  87 void                    exp_readunlock(void);
  88 struct svc_expkey *     exp_find_key(struct auth_domain *clp,
  89                                      int fsid_type, u32 *fsidv,
  90                                      struct cache_req *reqp);
  91 struct svc_export *     exp_get_by_name(struct auth_domain *clp,
  92                                         struct vfsmount *mnt,
  93                                         struct dentry *dentry,
  94                                         struct cache_req *reqp);
  95 struct svc_export *     exp_parent(struct auth_domain *clp,
  96                                    struct vfsmount *mnt,
  97                                    struct dentry *dentry,
  98                                    struct cache_req *reqp);
  99 int                     exp_rootfh(struct auth_domain *,
 100                                         char *path, struct knfsd_fh *, int maxsize);
 101 int                     exp_pseudoroot(struct auth_domain *, struct svc_fh *fhp, struct cache_req *creq);
 102 int                     nfserrno(int errno);
 103
 104 extern void expkey_put(struct cache_head *item, struct cache_detail *cd);
 105 extern void svc_export_put(struct cache_head *item, struct cache_detail *cd);
 106 extern struct cache_detail svc_export_cache, svc_expkey_cache;
 107
 108 static inline void exp_put(struct svc_export *exp)
 109 {
 110         svc_export_put(&exp->h, &svc_export_cache);
 111 }
 112
 113 static inline void exp_get(struct svc_export *exp)
 114 {
 115         cache_get(&exp->h);
 116 }
 117 static inline struct svc_export *
 118 exp_find(struct auth_domain *clp, int fsid_type, u32 *fsidv,
 119          struct cache_req *reqp)
 120 {
 121         struct svc_expkey *ek = exp_find_key(clp, fsid_type, fsidv, reqp);
 122         if (ek && !IS_ERR(ek)) {
 123                 struct svc_export *exp = ek->ek_export;
 124                 int err;
 125                 exp_get(exp);
 126                 expkey_put(&ek->h, &svc_expkey_cache);
 127                 if ((err = cache_check(&svc_export_cache, &exp->h, reqp)))
 128                         exp = ERR_PTR(err);
 129                 return exp;
 130         } else
 131                 return ERR_PTR(PTR_ERR(ek));
 132 }
 133
 134 #endif /* __KERNEL__ */
 135
 136 #endif /* NFSD_EXPORT_H */
 137