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1 | /* |
2 | * Copyright (c) 2000-2001 Christoph Hellwig. |
3 | * All rights reserved. |
4 | * |
5 | * Redistribution and use in source and binary forms, with or without |
6 | * modification, are permitted provided that the following conditions |
7 | * are met: |
8 | * 1. Redistributions of source code must retain the above copyright |
9 | * notice, this list of conditions, and the following disclaimer, |
10 | * without modification. |
11 | * 2. The name of the author may not be used to endorse or promote products |
12 | * derived from this software without specific prior written permission. |
13 | * |
14 | * Alternatively, this software may be distributed under the terms of the |
15 | * GNU General Public License ("GPL"). |
16 | * |
17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
18 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
20 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR |
21 | * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
23 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
24 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
25 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
26 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
27 | * SUCH DAMAGE. |
28 | * |
29 | */ |
30 | #ifndef _VXFS_DIR_H_ |
31 | #define _VXFS_DIR_H_ |
32 | |
33 | /* |
34 | * Veritas filesystem driver - directory structure. |
35 | * |
36 | * This file contains the definition of the vxfs directory format. |
37 | */ |
38 | |
39 | |
40 | /* |
41 | * VxFS directory block header. |
42 | * |
43 | * This entry is the head of every filesystem block in a directory. |
44 | * It is used for free space management and additionally includes |
45 | * a hash for speeding up directory search (lookup). |
46 | * |
47 | * The hash may be empty and in fact we do not use it all in the |
48 | * Linux driver for now. |
49 | */ |
50 | struct vxfs_dirblk { |
51 | u_int16_t d_free; /* free space in dirblock */ |
52 | u_int16_t d_nhash; /* no of hash chains */ |
53 | u_int16_t d_hash[1]; /* hash chain */ |
54 | }; |
55 | |
56 | /* |
57 | * VXFS_NAMELEN is the maximum length of the d_name field |
58 | * of an VxFS directory entry. |
59 | */ |
60 | #define VXFS_NAMELEN 256 |
61 | |
62 | /* |
63 | * VxFS directory entry. |
64 | */ |
65 | struct vxfs_direct { |
66 | vx_ino_t d_ino; /* inode number */ |
67 | u_int16_t d_reclen; /* record length */ |
68 | u_int16_t d_namelen; /* d_name length */ |
69 | u_int16_t d_hashnext; /* next hash entry */ |
70 | char d_name[VXFS_NAMELEN]; /* name */ |
71 | }; |
72 | |
73 | /* |
74 | * VXFS_DIRPAD defines the directory entry boundaries, is _must_ be |
75 | * a multiple of four. |
76 | * VXFS_NAMEMIN is the length of a directory entry with a NULL d_name. |
77 | * VXFS_DIRROUND is an internal macros that rounds a length to a value |
78 | * usable for directory sizes. |
79 | * VXFS_DIRLEN calculates the directory entry size for an entry with |
80 | * a d_name with size len. |
81 | */ |
82 | #define VXFS_DIRPAD 4 |
83 | #define VXFS_NAMEMIN offsetof(struct vxfs_direct, d_name) |
84 | #define VXFS_DIRROUND(len) ((VXFS_DIRPAD + (len) - 1) & ~(VXFS_DIRPAD -1)) |
85 | #define VXFS_DIRLEN(len) (VXFS_DIRROUND(VXFS_NAMEMIN + (len))) |
86 | |
87 | /* |
88 | * VXFS_DIRBLKOV is the overhead of a specific dirblock. |
89 | */ |
90 | #define VXFS_DIRBLKOV(dbp) ((sizeof(short) * dbp->d_nhash) + 4) |
91 | |
92 | #endif /* _VXFS_DIR_H_ */ |
93 |
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v2.6.34-rc5
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