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Add a bounds_check_with_mediasize function, which is intended 

for checking RAW_PART transfers (and later raw disk devices).
This commit is contained in:
fvdl 2003-04-03 22:20:24 +00:00
parent 67c767ede2
commit 2257bf89d4
1 changed files with 38 additions and 2 deletions
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40
sys/kern/subr_disk.c
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@ -1,4 +1,4 @@
/* $NetBSD: subr_disk.c,v 1.49 2002/11/06 02:31:34 enami Exp $ */
/* $NetBSD: subr_disk.c,v 1.50 2003/04/03 22:20:24 fvdl Exp $ */
/*-
* Copyright (c) 1996, 1997, 1999, 2000 The NetBSD Foundation, Inc.
@ -78,7 +78,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: subr_disk.c,v 1.49 2002/11/06 02:31:34 enami Exp $");
__KERNEL_RCSID(0, "$NetBSD: subr_disk.c,v 1.50 2003/04/03 22:20:24 fvdl Exp $");
#include "opt_compat_netbsd.h"
@ -817,3 +817,39 @@ bufq_free(struct bufq_state *bufq)
bufq->bq_get = NULL;
bufq->bq_put = NULL;
}
/*
* Bounds checking against the media size, used for the raw partition.
* The sector size passed in should currently always be DEV_BSIZE,
* and the media size the size of the device in DEV_BSIZE sectors.
*/
int
bounds_check_with_mediasize(struct buf *bp, int secsize, u_int64_t mediasize)
{
int sz;
sz = howmany(bp->b_bcount, secsize);
if (bp->b_blkno + sz > mediasize) {
sz = mediasize - bp->b_blkno;
if (sz == 0) {
/* If exactly at end of disk, return EOF. */
bp->b_resid = bp->b_bcount;
goto done;
}
if (sz < 0) {
/* If past end of disk, return EINVAL. */
bp->b_error = EINVAL;
goto bad;
}
/* Otherwise, truncate request. */
bp->b_bcount = sz << DEV_BSHIFT;
}
return 1;
bad:
bp->b_flags |= B_ERROR;
done:
return 0;
}