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Fixed the sector size frobbing in sd_strategy() at least not to

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break for the usual sector size.  dscheck() adjusts b_bcount to
handle EOF, so we must scale it and not preserve it.  i/o beyond
the end of partitions has been broken since rev.1.96.

Not fixed in:	od driver
This commit is contained in:
Bruce Evans 1997-11-23 11:30:42 +00:00
parent d826c47904
commit 37b4744c2a
1 changed files with 7 additions and 8 deletions
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15
sys/scsi/sd.c
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@ -15,7 +15,7 @@
*
* Ported to run under 386BSD by Julian Elischer (julian@dialix.oz.au) Sept 1992
*
* $Id: sd.c,v 1.112 1997/10/12 08:54:47 joerg Exp $
* $Id: sd.c,v 1.113 1997/11/07 08:53:32 phk Exp $
*/
#include "opt_bounce.h"
@ -457,22 +457,21 @@ sd_strategy(struct buf *bp, struct scsi_link *sc_link)
{
int status;
int sec_blk_ratio = secsize/DEV_BSIZE;
/* save original block number and size */
int b_blkno = bp->b_blkno;
int b_bcount = bp->b_bcount;
/* replace with scaled values */
/* Replace blkno and count with scaled values. */
bp->b_blkno /= sec_blk_ratio;
bp->b_bcount /= sec_blk_ratio;
/* enforce limits and map to physical block number */
status = dscheck(bp, sd->dk_slices);
/* prevent bad side effects in block system */
/*
* Restore blkno and unscale the values set by dscheck(),
* except for b_pblkno.
*/
bp->b_blkno = b_blkno;
bp->b_bcount = b_bcount;
/* scale resid */
bp->b_bcount *= sec_blk_ratio;
bp->b_resid *= sec_blk_ratio;
/* see if the mapping failed */