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0b1e987c | 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
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2 | /* |
3 | * Copyright (c) 2000-2001 Christoph Hellwig. | |
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4 | */ |
5 | #ifndef _VXFS_DIR_H_ | |
6 | #define _VXFS_DIR_H_ | |
7 | ||
8 | /* | |
9 | * Veritas filesystem driver - directory structure. | |
10 | * | |
11 | * This file contains the definition of the vxfs directory format. | |
12 | */ | |
13 | ||
14 | ||
15 | /* | |
16 | * VxFS directory block header. | |
17 | * | |
18 | * This entry is the head of every filesystem block in a directory. | |
c78bad11 | 19 | * It is used for free space management and additionally includes |
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20 | * a hash for speeding up directory search (lookup). |
21 | * | |
22 | * The hash may be empty and in fact we do not use it all in the | |
23 | * Linux driver for now. | |
24 | */ | |
25 | struct vxfs_dirblk { | |
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26 | __fs16 d_free; /* free space in dirblock */ |
27 | __fs16 d_nhash; /* no of hash chains */ | |
28 | __fs16 d_hash[1]; /* hash chain */ | |
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29 | }; |
30 | ||
31 | /* | |
32 | * VXFS_NAMELEN is the maximum length of the d_name field | |
33 | * of an VxFS directory entry. | |
34 | */ | |
35 | #define VXFS_NAMELEN 256 | |
36 | ||
37 | /* | |
38 | * VxFS directory entry. | |
39 | */ | |
40 | struct vxfs_direct { | |
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41 | __fs32 d_ino; /* inode number */ |
42 | __fs16 d_reclen; /* record length */ | |
43 | __fs16 d_namelen; /* d_name length */ | |
44 | __fs16 d_hashnext; /* next hash entry */ | |
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45 | char d_name[VXFS_NAMELEN]; /* name */ |
46 | }; | |
47 | ||
48 | /* | |
49 | * VXFS_DIRPAD defines the directory entry boundaries, is _must_ be | |
50 | * a multiple of four. | |
51 | * VXFS_NAMEMIN is the length of a directory entry with a NULL d_name. | |
52 | * VXFS_DIRROUND is an internal macros that rounds a length to a value | |
53 | * usable for directory sizes. | |
54 | * VXFS_DIRLEN calculates the directory entry size for an entry with | |
55 | * a d_name with size len. | |
56 | */ | |
57 | #define VXFS_DIRPAD 4 | |
85420cca | 58 | #define VXFS_NAMEMIN offsetof(struct vxfs_direct, d_name) |
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59 | #define VXFS_DIRROUND(len) ((VXFS_DIRPAD + (len) - 1) & ~(VXFS_DIRPAD -1)) |
60 | #define VXFS_DIRLEN(len) (VXFS_DIRROUND(VXFS_NAMEMIN + (len))) | |
61 | ||
62 | /* | |
63 | * VXFS_DIRBLKOV is the overhead of a specific dirblock. | |
64 | */ | |
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65 | #define VXFS_DIRBLKOV(sbi, dbp) \ |
66 | ((sizeof(short) * fs16_to_cpu(sbi, dbp->d_nhash)) + 4) | |
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67 | |
68 | #endif /* _VXFS_DIR_H_ */ |