2 * Copyright (c) 2000-2001 Christoph Hellwig.
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33 #ident "$Id: vxfs_dir.h,v 1.7 2001/05/21 15:48:26 hch Exp hch $"
36 * Veritas filesystem driver - directory structure.
38 * This file contains the definition of the vxfs directory format.
43 * VxFS directory block header.
45 * This entry is the head of every filesystem block in a directory.
46 * It is used for free space managment and additionally includes
47 * a hash for speeding up directory search (lookup).
49 * The hash may be empty and in fact we do not use it all in the
50 * Linux driver for now.
53 u_int16_t d_free; /* free space in dirblock */
54 u_int16_t d_nhash; /* no of hash chains */
55 u_int16_t d_hash[1]; /* hash chain */
59 * VXFS_NAMELEN is the maximum length of the d_name field
60 * of an VxFS directory entry.
62 #define VXFS_NAMELEN 256
65 * VxFS directory entry.
68 vx_ino_t d_ino; /* inode number */
69 u_int16_t d_reclen; /* record length */
70 u_int16_t d_namelen; /* d_name length */
71 u_int16_t d_hashnext; /* next hash entry */
72 char d_name[VXFS_NAMELEN]; /* name */
76 * VXFS_DIRPAD defines the directory entry boundaries, is _must_ be
78 * VXFS_NAMEMIN is the length of a directory entry with a NULL d_name.
79 * VXFS_DIRROUND is an internal macros that rounds a length to a value
80 * usable for directory sizes.
81 * VXFS_DIRLEN calculates the directory entry size for an entry with
82 * a d_name with size len.
85 #define VXFS_NAMEMIN ((int)((struct vxfs_direct *)0)->d_name)
86 #define VXFS_DIRROUND(len) ((VXFS_DIRPAD + (len) - 1) & ~(VXFS_DIRPAD -1))
87 #define VXFS_DIRLEN(len) (VXFS_DIRROUND(VXFS_NAMEMIN + (len)))
90 * VXFS_DIRBLKOV is the overhead of a specific dirblock.
92 #define VXFS_DIRBLKOV(dbp) ((sizeof(short) * dbp->d_nhash) + 4)
94 #endif /* _VXFS_DIR_H_ */