cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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vxfs_dir.h (1894B)

      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_ */