69 строки
1.8 KiB
C
69 строки
1.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (c) 2000-2001 Christoph Hellwig.
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*/
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#ifndef _VXFS_DIR_H_
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#define _VXFS_DIR_H_
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/*
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* Veritas filesystem driver - directory structure.
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*
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* This file contains the definition of the vxfs directory format.
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*/
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/*
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* VxFS directory block header.
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*
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* This entry is the head of every filesystem block in a directory.
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* It is used for free space management and additionally includes
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* a hash for speeding up directory search (lookup).
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*
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* The hash may be empty and in fact we do not use it all in the
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* Linux driver for now.
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*/
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struct vxfs_dirblk {
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__fs16 d_free; /* free space in dirblock */
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__fs16 d_nhash; /* no of hash chains */
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__fs16 d_hash[1]; /* hash chain */
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};
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/*
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* VXFS_NAMELEN is the maximum length of the d_name field
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* of an VxFS directory entry.
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*/
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#define VXFS_NAMELEN 256
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/*
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* VxFS directory entry.
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*/
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struct vxfs_direct {
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__fs32 d_ino; /* inode number */
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__fs16 d_reclen; /* record length */
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__fs16 d_namelen; /* d_name length */
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__fs16 d_hashnext; /* next hash entry */
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char d_name[VXFS_NAMELEN]; /* name */
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};
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/*
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* VXFS_DIRPAD defines the directory entry boundaries, is _must_ be
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* a multiple of four.
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* VXFS_NAMEMIN is the length of a directory entry with a NULL d_name.
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* VXFS_DIRROUND is an internal macros that rounds a length to a value
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* usable for directory sizes.
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* VXFS_DIRLEN calculates the directory entry size for an entry with
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* a d_name with size len.
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*/
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#define VXFS_DIRPAD 4
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#define VXFS_NAMEMIN offsetof(struct vxfs_direct, d_name)
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#define VXFS_DIRROUND(len) ((VXFS_DIRPAD + (len) - 1) & ~(VXFS_DIRPAD -1))
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#define VXFS_DIRLEN(len) (VXFS_DIRROUND(VXFS_NAMEMIN + (len)))
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/*
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* VXFS_DIRBLKOV is the overhead of a specific dirblock.
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*/
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#define VXFS_DIRBLKOV(sbi, dbp) \
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((sizeof(short) * fs16_to_cpu(sbi, dbp->d_nhash)) + 4)
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#endif /* _VXFS_DIR_H_ */
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