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Add bounds_check_with_label().

This commit is contained in:
soren 2000-03-21 02:26:48 +00:00
parent 704061a359
commit 82f0c9bf4a
1 changed files with 55 additions and 10 deletions
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65
sys/arch/cobalt/cobalt/disksubr.c
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@ -1,4 +1,4 @@
/* $NetBSD: disksubr.c,v 1.1 2000/03/19 23:07:44 soren Exp $ */
/* $NetBSD: disksubr.c,v 1.2 2000/03/21 02:26:48 soren Exp $ */
/*
* Copyright (c) 1982, 1986, 1988 Regents of the University of California.
@ -76,15 +76,6 @@ writedisklabel(dev, strat, lp, osdep)
return ENODEV;
}
int
bounds_check_with_label(bp, lp, wlabel)
struct buf *bp;
struct disklabel *lp;
int wlabel;
{
return 1;
}
void
dk_establish(dk, dev)
struct disk *dk;
@ -339,3 +330,57 @@ out:
brelse(bp);
return (rv);
}
/*
* Determine the size of the transfer, and make sure it is
* within the boundaries of the partition. Adjust transfer
* if needed, and signal errors or early completion.
*/
int
bounds_check_with_label(bp, lp, wlabel)
struct buf *bp;
struct disklabel *lp;
int wlabel;
{
struct partition *p = lp->d_partitions + DISKPART(bp->b_dev);
int labelsector = lp->d_partitions[2].p_offset + LABELSECTOR;
int sz;
sz = howmany(bp->b_bcount, lp->d_secsize);
if (bp->b_blkno + sz > p->p_size) {
sz = p->p_size - 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;
}
/* Overwriting disk label? */
if (bp->b_blkno + p->p_offset <= labelsector &&
#if LABELSECTOR != 0
bp->b_blkno + p->p_offset + sz > labelsector &&
#endif
(bp->b_flags & B_READ) == 0 && !wlabel) {
bp->b_error = EROFS;
goto bad;
}
/* Calculate cylinder for disksort to order transfers with. */
bp->b_cylinder = (bp->b_blkno + p->p_offset) /
(lp->d_secsize / DEV_BSIZE) / lp->d_secpercyl;
return (1);
bad:
bp->b_flags |= B_ERROR;
done:
return (0);
}