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Bruces fixes for large filesystems

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Submitted by:	Bruce Evans <bde@zeta.org.au>
This commit is contained in:
Gary Palmer 1995-02-19 10:36:17 +00:00
parent e28d028200
commit 43decb5384
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=6558
1 changed files with 11 additions and 11 deletions
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22
sys/i386/include/param.h
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@ -34,7 +34,7 @@
* SUCH DAMAGE.
*
* from: @(#)param.h 5.8 (Berkeley) 6/28/91
* $Id: param.h,v 1.16 1994/09/18 22:05:22 bde Exp $
* $Id: param.h,v 1.17 1995/01/23 19:21:49 davidg Exp $
*/
#ifndef _MACHINE_PARAM_H_
@ -134,18 +134,18 @@
/* bytes to clicks */
#define btoc(x) (((unsigned)(x)+(NBPG-1))>>PGSHIFT)
#define btodb(bytes) /* calculates (bytes / DEV_BSIZE) */ \
((unsigned)(bytes) >> DEV_BSHIFT)
#define dbtob(db) /* calculates (db * DEV_BSIZE) */ \
((unsigned)(db) << DEV_BSHIFT)
/*
* Map a ``block device block'' to a file system block.
* This should be device dependent, and will be if we
* add an entry to cdevsw/bdevsw for that purpose.
* For now though just use DEV_BSIZE.
* This is messy and perhaps slow because `bytes' may be an off_t. We
* have to shift an unsigned type to avoid sign extension and we don't
* want to widen `bytes' unnecessarily. Assume that off_t is long long
* and daddr_t is unsigned long.
*/
#define bdbtofsb(bn) ((bn) / (BLKDEV_IOSIZE/DEV_BSIZE))
#define btodb(bytes) /* calculates (bytes / DEV_BSIZE) */ \
(sizeof (bytes) > sizeof(long) \
? (unsigned long)((unsigned long long)(bytes) >> DEV_BSHIFT) \
: (unsigned long)((unsigned long)(bytes) >> DEV_BSHIFT))
#define dbtob(db) /* calculates (db * DEV_BSIZE) */ \
((unsigned long long)(db) << DEV_BSHIFT)
/*
* Mach derived conversion macros