1/*
 2 * Copyright (c) 2000-2001 Christoph Hellwig.
 3 * All rights reserved.
 4 *
 5 * Redistribution and use in source and binary forms, with or without
 6 * modification, are permitted provided that the following conditions
 7 * are met:
 8 * 1. Redistributions of source code must retain the above copyright
 9 *    notice, this list of conditions, and the following disclaimer,
10 *    without modification.
11 * 2. The name of the author may not be used to endorse or promote products
12 *    derived from this software without specific prior written permission.
13 *
14 * Alternatively, this software may be distributed under the terms of the
15 * GNU General Public License ("GPL").
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
21 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 */
30#ifndef _VXFS_DIR_H_
31#define _VXFS_DIR_H_
32
33/*
34 * Veritas filesystem driver - directory structure.
35 *
36 * This file contains the definition of the vxfs directory format.
37 */
38
39
40/*
41 * VxFS directory block header.
42 *
43 * This entry is the head of every filesystem block in a directory.
44 * It is used for free space management and additionally includes
45 * a hash for speeding up directory search (lookup).
46 *
47 * The hash may be empty and in fact we do not use it all in the
48 * Linux driver for now.
49 */
50struct vxfs_dirblk {
51	u_int16_t	d_free;		/* free space in dirblock */
52	u_int16_t	d_nhash;	/* no of hash chains */
53	u_int16_t	d_hash[1];	/* hash chain */
54};
55
56/*
57 * VXFS_NAMELEN is the maximum length of the d_name field
58 *	of an VxFS directory entry.
59 */
60#define VXFS_NAMELEN	256
61
62/*
63 * VxFS directory entry.
64 */
65struct vxfs_direct {
66	vx_ino_t	d_ino;			/* inode number */
67	u_int16_t	d_reclen;		/* record length */
68	u_int16_t	d_namelen;		/* d_name length */
69	u_int16_t	d_hashnext;		/* next hash entry */
70	char		d_name[VXFS_NAMELEN];	/* name */
71};
72
73/*
74 * VXFS_DIRPAD defines the directory entry boundaries, is _must_ be
75 *	a multiple of four.
76 * VXFS_NAMEMIN is the length of a directory entry with a NULL d_name.
77 * VXFS_DIRROUND is an internal macros that rounds a length to a value
78 *	usable for directory sizes.
79 * VXFS_DIRLEN calculates the directory entry size for an entry with
80 *	a d_name with size len.
81 */
82#define VXFS_DIRPAD		4
83#define VXFS_NAMEMIN		offsetof(struct vxfs_direct, d_name)
84#define VXFS_DIRROUND(len)	((VXFS_DIRPAD + (len) - 1) & ~(VXFS_DIRPAD -1))
85#define VXFS_DIRLEN(len)	(VXFS_DIRROUND(VXFS_NAMEMIN + (len)))
86
87/*
88 * VXFS_DIRBLKOV is the overhead of a specific dirblock.
89 */
90#define VXFS_DIRBLKOV(dbp)	((sizeof(short) * dbp->d_nhash) + 4)
 
91
92#endif /* _VXFS_DIR_H_ */

 1/* SPDX-License-Identifier: GPL-2.0-only */
 2/*
 3 * Copyright (c) 2000-2001 Christoph Hellwig.
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 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.
19 * It is used for free space management and additionally includes
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 */
25struct vxfs_dirblk {
26	__fs16		d_free;		/* free space in dirblock */
27	__fs16		d_nhash;	/* no of hash chains */
28	__fs16		d_hash[1];	/* hash chain */
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 */
40struct vxfs_direct {
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 */
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
58#define VXFS_NAMEMIN		offsetof(struct vxfs_direct, d_name)
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 */
65#define VXFS_DIRBLKOV(sbi, dbp)	\
66	((sizeof(short) * fs16_to_cpu(sbi, dbp->d_nhash)) + 4)
67
68#endif /* _VXFS_DIR_H_ */