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From Bruce Evans: Ignore the read-ahead cache if the device changes.

This commit is contained in:
mycroft 1994-02-20 14:05:19 +00:00
parent 64b3a3e372
commit 3b3ce2d3c6
1 changed files with 4 additions and 2 deletions
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6
sys/arch/i386/boot/disk.c
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@ -25,7 +25,7 @@
* any improvements or extensions that they make and grant Carnegie Mellon
* the rights to redistribute these changes.
*
* $Id: disk.c,v 1.5 1994/02/03 23:21:25 mycroft Exp $
* $Id: disk.c,v 1.6 1994/02/20 14:05:19 mycroft Exp $
*/
#include "boot.h"
@ -158,13 +158,14 @@ devread()
*/
#define RA_SECTORS 18
static char ra_buf[RA_SECTORS * BPS];
static int ra_dev;
static int ra_end;
static int ra_first;
Bread(dosdev, sector)
int dosdev, sector;
{
if (sector < ra_first || sector >= ra_end) {
if (dosdev != ra_dev || sector < ra_first || sector >= ra_end) {
int cyl, head, sec, nsec;
cyl = sector/spc;
@ -182,6 +183,7 @@ Bread(dosdev, sector)
twiddle();
}
}
ra_dev = dosdev;
ra_first = sector;
ra_end = sector + nsec;
}