2 * Copyright (c) 2000-2001 Christoph Hellwig.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
14 * Alternatively, this software may be distributed under the terms of the
15 * GNU General Public License ("GPL").
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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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
34 * Veritas filesystem driver - directory structure.
36 * This file contains the definition of the vxfs directory format.
41 * VxFS directory block header.
43 * This entry is the head of every filesystem block in a directory.
44 * It is used for free space managment and additionally includes
45 * a hash for speeding up directory search (lookup).
47 * The hash may be empty and in fact we do not use it all in the
48 * Linux driver for now.
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 */
57 * VXFS_NAMELEN is the maximum length of the d_name field
58 * of an VxFS directory entry.
60 #define VXFS_NAMELEN 256
63 * VxFS directory entry.
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 */
74 * VXFS_DIRPAD defines the directory entry boundaries, is _must_ be
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.
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)))
88 * VXFS_DIRBLKOV is the overhead of a specific dirblock.
90 #define VXFS_DIRBLKOV(dbp) ((sizeof(short) * dbp->d_nhash) + 4)
92 #endif /* _VXFS_DIR_H_ */