Coherent4.2.10/include/sys/filsys.h

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/* (-lgl
 *	Coherent 386 release 4.2
 *	Copyright (c) 1982, 1993 by Mark Williams Company.
 *	All rights reserved. May not be copied without permission.
 *	For copying permission and licensing info, write licensing@mwc.com
 -lgl) */

#ifndef	 __SYS_FILSYS_H__
#define  __SYS_FILSYS_H__

/*
 * Super block, free block list definitions.
 */

#include <common/ccompat.h>
#include <common/__time.h>
#include <common/__daddr.h>
#include <common/_uid.h>


/*
 * Size definitions.
 */

#define NICINOD	100		/* Number of free in core inodes */
#define INOPB	8		/* Number of inodes per block */
#define BOOTBI	0		/* Boot block index */
#define SUPERI	1		/* Super block index */
#define INODEI	2		/* Inode block index */
#define BADFIN	1		/* Bad block inode number */
#define ROOTIN	2		/* Root inode number */
#define NICFREE	64		/* number of blocks in free list block */


/*
 * Free list block structure.
 */

struct fblk {
	unsigned short	df_nfree;		/* Number of free blocks */
#pragma align 2
	__daddr_t	df_free [NICFREE] __ALIGN (2);	/* Free blocks */
#pragma align
#pragma	align 2
};
#pragma	align	/* control structure padding with Coherent 'cc' */


/*
 * Super block.
 */

struct filsys {
	unsigned short	s_isize;	/* First block not in inode list */
#pragma align 2
	__daddr_t	s_fsize __ALIGN (2);	/* Size of entire volume */
#pragma align
	short		s_nfree;	/* Number of addresses in s_free */
	__daddr_t	s_free [NICFREE]; /* Free block list */
	short		s_ninode;	/* Number of inodes in s_inode */
	o_ino_t		s_inode [NICINOD]; /* Free inode list */
	char		s_flock;	/* Not used */
	char		s_ilock;	/* Not used */
	char		s_fmod;		/* Super block modified flag */
	char		s_ronly;	/* Mounted read only flag */
#pragma align 2
	__time_t	s_time __ALIGN (2);	/* Last super block update */
	__daddr_t	s_tfree __ALIGN (2);	/* Total free blocks */
#pragma align
	o_ino_t		s_tinode;	/* Total free inodes */
	short		s_m;		/* Interleave factor */
	short		s_n;		/* Interleave factor */
	char		s_fname [6];	/* File system name */
	char		s_fpack [6];	/* File system pack name */
	long		s_unique;	/* Unique number */
};


/*
 * Functions.
 */

#define iblockn(ino)	(INODEI + ((ino) - 1) / INOPB)
#define iblocko(ino)	(((ino) - 1) % INOPB)

#endif	/* ! defined (__SYS_FILSYS_H__) */