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marcus.erl |
/*
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* Copyright (c) 2000-2001 Christoph Hellwig.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions, and the following disclaimer,
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* without modification.
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* 2. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* Alternatively, this software may be distributed under the terms of the
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* GNU General Public License ("GPL").
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
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* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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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 managment 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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u_int16_t d_free; /* free space in dirblock */
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u_int16_t d_nhash; /* no of hash chains */
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u_int16_t 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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vx_ino_t d_ino; /* inode number */
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u_int16_t d_reclen; /* record length */
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u_int16_t d_namelen; /* d_name length */
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u_int16_t 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(dbp) ((sizeof(short) * dbp->d_nhash) + 4)
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#endif /* _VXFS_DIR_H_ */
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