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/*
* Mach Operating System
* Copyright (c) 1991,1990 Carnegie Mellon University
* All Rights Reserved.
*
* Permission to use, copy, modify and distribute this software and its
* documentation is hereby granted, provided that both the copyright
* notice and this permission notice appear in all copies of the
* software, derivative works or modified versions, and any portions
* thereof, and that both notices appear in supporting documentation.
*
* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
*
* Carnegie Mellon requests users of this software to return to
*
* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
* School of Computer Science
* Carnegie Mellon University
* Pittsburgh PA 15213-3890
*
* any improvements or extensions that they make and grant Carnegie Mellon
* the rights to redistribute these changes.
*/
/*
* Common definitions for Berkeley Fast File System.
*/
/*
* Compatibility definitions for disk IO.
*/
/*
* Disk devices do all IO in 512-byte blocks.
*/
#define DEV_BSIZE 512
/*
* Conversion between bytes and disk blocks.
*/
#define btodb(byte_offset) ((byte_offset) >> 9)
#define dbtob(block_number) ((block_number) << 9)
typedef struct _quad_
{
unsigned int val[2]; /* 2 int values make... */
}
quad; /* an 8-byte item */
typedef unsigned int mach_time_t; /* an unsigned int */
typedef unsigned int mach_daddr_t; /* an unsigned int */
typedef unsigned int mach_off_t; /* another unsigned int */
typedef unsigned short mach_uid_t;
typedef unsigned short mach_gid_t;
typedef unsigned int mach_ino_t;
#define NBBY 8
/*
* The file system is made out of blocks of at most MAXBSIZE units,
* with smaller units (fragments) only in the last direct block.
* MAXBSIZE primarily determines the size of buffers in the buffer
* pool. It may be made larger without any effect on existing
* file systems; however, making it smaller may make some file
* systems unmountable.
*
* Note that the disk devices are assumed to have DEV_BSIZE "sectors"
* and that fragments must be some multiple of this size.
*/
#define MAXBSIZE 8192
#define MAXFRAG 8
/*
* MAXPATHLEN defines the longest permissible path length
* after expanding symbolic links.
*
* MAXSYMLINKS defines the maximum number of symbolic links
* that may be expanded in a path name. It should be set
* high enough to allow all legitimate uses, but halt infinite
* loops reasonably quickly.
*/
#define MAXPATHLEN 1024
#define MAXSYMLINKS 8
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