include/uapi/linux/nfsd/nfsfh.h

   1 /*
   2  * This file describes the layout of the file handles as passed
   3  * over the wire.
   4  *
   5  * Copyright (C) 1995, 1996, 1997 Olaf Kirch <okir@monad.swb.de>
   6  */
   7
   8 #ifndef _UAPI_LINUX_NFSD_FH_H
   9 #define _UAPI_LINUX_NFSD_FH_H
  10
  11 #include <linux/types.h>
  12 #include <linux/nfs.h>
  13 #include <linux/nfs2.h>
  14 #include <linux/nfs3.h>
  15 #include <linux/nfs4.h>
  16
  17 /*
  18  * This is the old "dentry style" Linux NFSv2 file handle.
  19  *
  20  * The xino and xdev fields are currently used to transport the
  21  * ino/dev of the exported inode.
  22  */
  23 struct nfs_fhbase_old {
  24         __u32           fb_dcookie;     /* dentry cookie - always 0xfeebbaca */
  25         __u32           fb_ino;         /* our inode number */
  26         __u32           fb_dirino;      /* dir inode number, 0 for directories */
  27         __u32           fb_dev;         /* our device */
  28         __u32           fb_xdev;
  29         __u32           fb_xino;
  30         __u32           fb_generation;
  31 };
  32
  33 /*
  34  * This is the new flexible, extensible style NFSv2/v3/v4 file handle.
  35  * by Neil Brown <neilb@cse.unsw.edu.au> - March 2000
  36  *
  37  * The file handle starts with a sequence of four-byte words.
  38  * The first word contains a version number (1) and three descriptor bytes
  39  * that tell how the remaining 3 variable length fields should be handled.
  40  * These three bytes are auth_type, fsid_type and fileid_type.
  41  *
  42  * All four-byte values are in host-byte-order.
  43  *
  44  * The auth_type field is deprecated and must be set to 0.
  45  *
  46  * The fsid_type identifies how the filesystem (or export point) is
  47  *    encoded.
  48  *  Current values:
  49  *     0  - 4 byte device id (ms-2-bytes major, ls-2-bytes minor), 4byte inode number
  50  *        NOTE: we cannot use the kdev_t device id value, because kdev_t.h
  51  *              says we mustn't.  We must break it up and reassemble.
  52  *     1  - 4 byte user specified identifier
  53  *     2  - 4 byte major, 4 byte minor, 4 byte inode number - DEPRECATED
  54  *     3  - 4 byte device id, encoded for user-space, 4 byte inode number
  55  *     4  - 4 byte inode number and 4 byte uuid
  56  *     5  - 8 byte uuid
  57  *     6  - 16 byte uuid
  58  *     7  - 8 byte inode number and 16 byte uuid
  59  *
  60  * The fileid_type identified how the file within the filesystem is encoded.
  61  *   The values for this field are filesystem specific, exccept that
  62  *   filesystems must not use the values '0' or '0xff'. 'See enum fid_type'
  63  *   in include/linux/exportfs.h for currently registered values.
  64  */
  65 struct nfs_fhbase_new {
  66         __u8            fb_version;     /* == 1, even => nfs_fhbase_old */
  67         __u8            fb_auth_type;
  68         __u8            fb_fsid_type;
  69         __u8            fb_fileid_type;
  70         __u32           fb_auth[1];
  71 /*      __u32           fb_fsid[0]; floating */
  72 /*      __u32           fb_fileid[0]; floating */
  73 };
  74
  75 struct knfsd_fh {
  76         unsigned int    fh_size;        /* significant for NFSv3.
  77                                          * Points to the current size while building
  78                                          * a new file handle
  79                                          */
  80         union {
  81                 struct nfs_fhbase_old   fh_old;
  82                 __u32                   fh_pad[NFS4_FHSIZE/4];
  83                 struct nfs_fhbase_new   fh_new;
  84         } fh_base;
  85 };
  86
  87 #define ofh_dcookie             fh_base.fh_old.fb_dcookie
  88 #define ofh_ino                 fh_base.fh_old.fb_ino
  89 #define ofh_dirino              fh_base.fh_old.fb_dirino
  90 #define ofh_dev                 fh_base.fh_old.fb_dev
  91 #define ofh_xdev                fh_base.fh_old.fb_xdev
  92 #define ofh_xino                fh_base.fh_old.fb_xino
  93 #define ofh_generation          fh_base.fh_old.fb_generation
  94
  95 #define fh_version              fh_base.fh_new.fb_version
  96 #define fh_fsid_type            fh_base.fh_new.fb_fsid_type
  97 #define fh_auth_type            fh_base.fh_new.fb_auth_type
  98 #define fh_fileid_type          fh_base.fh_new.fb_fileid_type
  99 #define fh_fsid                 fh_base.fh_new.fb_auth
 100
 101 /* Do not use, provided for userspace compatiblity. */
 102 #define fh_auth                 fh_base.fh_new.fb_auth
 103
 104 #endif /* _UAPI_LINUX_NFSD_FH_H */