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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 | ||
62 | struct 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__ */ |