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when mounting a filesystem, read the last block in the filesystem

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to verify that the device is at least as big as the superblock claims
the filesystem is supposed to be, and if it's not then fail the mount.
this should help reduce the type of confusion reported in PR 13228.
This commit is contained in:
chs 2002-03-17 00:02:34 +00:00
parent 7c50f65a84
commit c1d184702f
1 changed files with 17 additions and 2 deletions
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19
sys/ufs/ffs/ffs_vfsops.c
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@ -1,4 +1,4 @@
/* $NetBSD: ffs_vfsops.c,v 1.93 2002/03/08 20:48:46 thorpej Exp $ */
/* $NetBSD: ffs_vfsops.c,v 1.94 2002/03/17 00:02:34 chs Exp $ */
/*
* Copyright (c) 1989, 1991, 1993, 1994
@ -36,7 +36,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: ffs_vfsops.c,v 1.93 2002/03/08 20:48:46 thorpej Exp $");
__KERNEL_RCSID(0, "$NetBSD: ffs_vfsops.c,v 1.94 2002/03/17 00:02:34 chs Exp $");
#if defined(_KERNEL_OPT)
#include "opt_ffs.h"
@ -691,6 +691,21 @@ ffs_mountfs(devvp, mp, p)
bp->b_flags |= B_INVAL;
brelse(bp);
bp = NULL;
/*
* verify that we can access the last block in the fs.
*/
error = bread(devvp, fsbtodb(fs, fs->fs_size - 1), fs->fs_fsize, cred,
&bp);
if (bp->b_bcount != fs->fs_fsize)
error = EINVAL;
bp->b_flags |= B_INVAL;
if (error)
goto out;
brelse(bp);
bp = NULL;
fs->fs_ronly = ronly;
if (ronly == 0) {
fs->fs_clean <<= 1;