| 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
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| 2 | /* |
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| 3 | * Copyright (c) 2000-2001 Christoph Hellwig. |
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| 4 | */ |
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| 5 | #ifndef _VXFS_DIR_H_ |
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| 6 | #define _VXFS_DIR_H_ |
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| 7 | |
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| 8 | /* |
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| 9 | * Veritas filesystem driver - directory structure. |
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| 10 | * |
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| 11 | * This file contains the definition of the vxfs directory format. |
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| 12 | */ |
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| 13 | |
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| 14 | |
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| 15 | /* |
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| 16 | * VxFS directory block header. |
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| 17 | * |
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| 18 | * This entry is the head of every filesystem block in a directory. |
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| 19 | * It is used for free space management and additionally includes |
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| 20 | * a hash for speeding up directory search (lookup). |
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| 21 | * |
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| 22 | * The hash may be empty and in fact we do not use it all in the |
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| 23 | * Linux driver for now. |
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| 24 | */ |
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| 25 | struct vxfs_dirblk { |
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| 26 | __fs16 d_free; /* free space in dirblock */ |
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| 27 | __fs16 d_nhash; /* no of hash chains */ |
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| 28 | __fs16 d_hash[1]; /* hash chain */ |
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| 29 | }; |
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| 30 | |
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| 31 | /* |
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| 32 | * VXFS_NAMELEN is the maximum length of the d_name field |
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| 33 | * of an VxFS directory entry. |
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| 34 | */ |
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| 35 | #define VXFS_NAMELEN 256 |
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| 36 | |
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| 37 | /* |
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| 38 | * VxFS directory entry. |
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| 39 | */ |
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| 40 | struct vxfs_direct { |
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| 41 | __fs32 d_ino; /* inode number */ |
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| 42 | __fs16 d_reclen; /* record length */ |
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| 43 | __fs16 d_namelen; /* d_name length */ |
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| 44 | __fs16 d_hashnext; /* next hash entry */ |
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| 45 | char d_name[VXFS_NAMELEN]; /* name */ |
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| 46 | }; |
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| 47 | |
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| 48 | /* |
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| 49 | * VXFS_DIRPAD defines the directory entry boundaries, is _must_ be |
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| 50 | * a multiple of four. |
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| 51 | * VXFS_NAMEMIN is the length of a directory entry with a NULL d_name. |
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| 52 | * VXFS_DIRROUND is an internal macros that rounds a length to a value |
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| 53 | * usable for directory sizes. |
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| 54 | * VXFS_DIRLEN calculates the directory entry size for an entry with |
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| 55 | * a d_name with size len. |
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| 56 | */ |
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| 57 | #define VXFS_DIRPAD 4 |
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| 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)) |
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| 60 | #define VXFS_DIRLEN(len) (VXFS_DIRROUND(VXFS_NAMEMIN + (len))) |
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| 61 | |
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| 62 | /* |
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| 63 | * VXFS_DIRBLKOV is the overhead of a specific dirblock. |
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| 64 | */ |
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| 65 | #define VXFS_DIRBLKOV(sbi, dbp) \ |
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| 66 | ((sizeof(short) * fs16_to_cpu(sbi, dbp->d_nhash)) + 4) |
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| 67 | |
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| 68 | #endif /* _VXFS_DIR_H_ */ |
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| 69 | |
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