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1 | /* |
2 | * Copyright (c) 2005 Silicon Graphics, Inc. All Rights Reserved. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify it | |
5 | * under the terms of version 2 of the GNU General Public License as | |
6 | * published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it would be useful, but | |
9 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. | |
11 | * | |
12 | * Further, this software is distributed without any warranty that it is | |
13 | * free of the rightful claim of any third person regarding infringement | |
14 | * or the like. Any license provided herein, whether implied or | |
15 | * otherwise, applies only to this software file. Patent licenses, if | |
16 | * any, provided herein do not apply to combinations of this program with | |
17 | * other software, or any other product whatsoever. | |
18 | * | |
19 | * You should have received a copy of the GNU General Public License along | |
20 | * with this program; if not, write the Free Software Foundation, Inc., 59 | |
21 | * Temple Place - Suite 330, Boston MA 02111-1307, USA. | |
22 | * | |
23 | * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy, | |
24 | * Mountain View, CA 94043, or: | |
25 | * | |
26 | * http://www.sgi.com | |
27 | * | |
28 | * For further information regarding this notice, see: | |
29 | * | |
30 | * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/ | |
31 | */ | |
32 | #ifndef __XFS_EXPORT_H__ | |
33 | #define __XFS_EXPORT_H__ | |
34 | ||
35 | /* | |
36 | * Common defines for code related to exporting XFS filesystems over NFS. | |
37 | * | |
38 | * The NFS fileid goes out on the wire as an array of | |
39 | * 32bit unsigned ints in host order. There are 5 possible | |
40 | * formats. | |
41 | * | |
42 | * (1) fileid_type=0x00 | |
43 | * (no fileid data; handled by the generic code) | |
44 | * | |
45 | * (2) fileid_type=0x01 | |
46 | * inode-num | |
47 | * generation | |
48 | * | |
49 | * (3) fileid_type=0x02 | |
50 | * inode-num | |
51 | * generation | |
52 | * parent-inode-num | |
53 | * parent-generation | |
54 | * | |
55 | * (4) fileid_type=0x81 | |
56 | * inode-num-lo32 | |
57 | * inode-num-hi32 | |
58 | * generation | |
59 | * | |
60 | * (5) fileid_type=0x82 | |
61 | * inode-num-lo32 | |
62 | * inode-num-hi32 | |
63 | * generation | |
64 | * parent-inode-num-lo32 | |
65 | * parent-inode-num-hi32 | |
66 | * parent-generation | |
67 | * | |
68 | * Note, the NFS filehandle also includes an fsid portion which | |
69 | * may have an inode number in it. That number is hardcoded to | |
70 | * 32bits and there is no way for XFS to intercept it. In | |
71 | * practice this means when exporting an XFS filesytem with 64bit | |
72 | * inodes you should either export the mountpoint (rather than | |
73 | * a subdirectory) or use the "fsid" export option. | |
74 | */ | |
75 | ||
76 | /* This flag goes on the wire. Don't play with it. */ | |
77 | #define XFS_FILEID_TYPE_64FLAG 0x80 /* NFS fileid has 64bit inodes */ | |
78 | ||
79 | /* Calculate the length in u32 units of the fileid data */ | |
80 | static inline int | |
81 | xfs_fileid_length(int hasparent, int is64) | |
82 | { | |
83 | return hasparent ? (is64 ? 6 : 4) : (is64 ? 3 : 2); | |
84 | } | |
85 | ||
86 | /* | |
87 | * Decode encoded inode information (either for the inode itself | |
88 | * or the parent) into an xfs_fid2_t structure. Advances and | |
89 | * returns the new data pointer | |
90 | */ | |
91 | static inline __u32 * | |
92 | xfs_fileid_decode_fid2(__u32 *p, xfs_fid2_t *fid, int is64) | |
93 | { | |
94 | fid->fid_len = sizeof(xfs_fid2_t) - sizeof(fid->fid_len); | |
95 | fid->fid_pad = 0; | |
96 | fid->fid_ino = *p++; | |
97 | #if XFS_BIG_INUMS | |
98 | if (is64) | |
99 | fid->fid_ino |= (((__u64)(*p++)) << 32); | |
100 | #endif | |
101 | fid->fid_gen = *p++; | |
102 | return p; | |
103 | } | |
104 | ||
105 | /* | |
106 | * Encode inode information (either for the inode itself or the | |
107 | * parent) into a fileid buffer. Advances and returns the new | |
108 | * data pointer. | |
109 | */ | |
110 | static inline __u32 * | |
111 | xfs_fileid_encode_inode(__u32 *p, struct inode *inode, int is64) | |
112 | { | |
113 | *p++ = (__u32)inode->i_ino; | |
114 | #if XFS_BIG_INUMS | |
115 | if (is64) | |
116 | *p++ = (__u32)(inode->i_ino >> 32); | |
117 | #endif | |
118 | *p++ = inode->i_generation; | |
119 | return p; | |
120 | } | |
121 | ||
122 | #endif /* __XFS_EXPORT_H__ */ |