projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 0b1e987c | 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
| 1da177e4 LT |
2 | /* |
| 3 | * Copyright (c) 2000-2001 Christoph Hellwig. | |
| 1da177e4 LT |
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 |
| 1da177e4 LT |
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 { | |
| 0d83f7fc KB |
26 | __fs16 d_free; /* free space in dirblock */ |
| 27 | __fs16 d_nhash; /* no of hash chains */ | |
| 28 | __fs16 d_hash[1]; /* hash chain */ | |
| 1da177e4 LT |
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 { | |
| 0d83f7fc KB |
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 */ | |
| 1da177e4 LT |
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) |
| 1da177e4 LT |
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 | */ | |
| 0d83f7fc KB |
65 | #define VXFS_DIRBLKOV(sbi, dbp) \ |
| 66 | ((sizeof(short) * fs16_to_cpu(sbi, dbp->d_nhash)) + 4) | |
| 1da177e4 LT |
67 | |
| 68 | #endif /* _VXFS_DIR_H_ */ |