linux/fs/xfs/xfs_export.h
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   1/*
   2 * Copyright (c) 2005 Silicon Graphics, Inc.
   3 * All Rights Reserved.
   4 *
   5 * This program is free software; you can redistribute it and/or
   6 * modify it under the terms of the GNU General Public License as
   7 * published by the Free Software Foundation.
   8 *
   9 * This program is distributed in the hope that it would be useful,
  10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 * GNU General Public License for more details.
  13 *
  14 * You should have received a copy of the GNU General Public License
  15 * along with this program; if not, write the Free Software Foundation,
  16 * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  17 */
  18#ifndef __XFS_EXPORT_H__
  19#define __XFS_EXPORT_H__
  20
  21/*
  22 * Common defines for code related to exporting XFS filesystems over NFS.
  23 *
  24 * The NFS fileid goes out on the wire as an array of
  25 * 32bit unsigned ints in host order.  There are 5 possible
  26 * formats.
  27 *
  28 * (1)  fileid_type=0x00
  29 *      (no fileid data; handled by the generic code)
  30 *
  31 * (2)  fileid_type=0x01
  32 *      inode-num
  33 *      generation
  34 *
  35 * (3)  fileid_type=0x02
  36 *      inode-num
  37 *      generation
  38 *      parent-inode-num
  39 *      parent-generation
  40 *
  41 * (4)  fileid_type=0x81
  42 *      inode-num-lo32
  43 *      inode-num-hi32
  44 *      generation
  45 *
  46 * (5)  fileid_type=0x82
  47 *      inode-num-lo32
  48 *      inode-num-hi32
  49 *      generation
  50 *      parent-inode-num-lo32
  51 *      parent-inode-num-hi32
  52 *      parent-generation
  53 *
  54 * Note, the NFS filehandle also includes an fsid portion which
  55 * may have an inode number in it.  That number is hardcoded to
  56 * 32bits and there is no way for XFS to intercept it.  In
  57 * practice this means when exporting an XFS filesystem with 64bit
  58 * inodes you should either export the mountpoint (rather than
  59 * a subdirectory) or use the "fsid" export option.
  60 */
  61
  62struct xfs_fid64 {
  63        u64 ino;
  64        u32 gen;
  65        u64 parent_ino;
  66        u32 parent_gen;
  67} __attribute__((packed));
  68
  69/* This flag goes on the wire.  Don't play with it. */
  70#define XFS_FILEID_TYPE_64FLAG  0x80    /* NFS fileid has 64bit inodes */
  71
  72#endif  /* __XFS_EXPORT_H__ */
  73
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