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__ */