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Only allow WAPBL to operate with UFS2 style superblocks. 

Problem reported by Takeshi Nakayama.
This commit is contained in:
simonb 2008-08-04 15:55:11 +00:00
parent bdb681208a
commit ba0675032b
1 changed files with 41 additions and 2 deletions
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43
sys/ufs/ffs/ffs_wapbl.c
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@ -1,4 +1,4 @@
/* $NetBSD: ffs_wapbl.c,v 1.3 2008/08/02 02:23:51 simonb Exp $ */
/* $NetBSD: ffs_wapbl.c,v 1.4 2008/08/04 15:55:11 simonb Exp $ */
/*-
* Copyright (c) 2003,2006,2008 The NetBSD Foundation, Inc.
@ -30,7 +30,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: ffs_wapbl.c,v 1.3 2008/08/02 02:23:51 simonb Exp $");
__KERNEL_RCSID(0, "$NetBSD: ffs_wapbl.c,v 1.4 2008/08/04 15:55:11 simonb Exp $");
#if defined(_KERNEL_OPT)
#include "opt_ffs.h"
@ -74,6 +74,7 @@ do { \
} while (/* CONSTCOND */0)
#endif
static int ffs_superblock_layout(struct fs *);
static int wapbl_log_position(struct mount *, struct fs *, struct vnode *,
daddr_t *, size_t *, size_t *, uint64_t *);
static int wapbl_create_infs_log(struct mount *, struct fs *, struct vnode *,
@ -83,6 +84,24 @@ static void wapbl_find_log_start(struct mount *, struct vnode *, off_t,
static int wapbl_remove_log(struct mount *);
static int wapbl_allocate_log_file(struct mount *, struct vnode *);
/*
* Return the super block layout format - UFS1 or UFS2.
* WAPBL only works with UFS2 layout (which is still available
* with FFSv1).
*
* XXX Should this be in ufs/ffs/fs.h? Same style of check is
* also used in ffs_alloc.c in a few places.
*/
static int
ffs_superblock_layout(struct fs *fs)
{
if ((fs->fs_magic == FS_UFS1_MAGIC) &&
((fs->fs_old_flags & FS_FLAGS_UPDATED) == 0))
return 1;
else
return 2;
}
/*
* This function is invoked after a log is replayed to
* disk to perform logical cleanup actions as described by
@ -203,6 +222,10 @@ wapbl_remove_log(struct mount *mp)
ino_t log_ino;
int error;
/* If super block layout is too old to support WAPBL, return */
if (ffs_superblock_layout(fs) < 2)
return 0;
/* If all the log locators are 0, just clean up */
if (fs->fs_journallocs[0] == 0 &&
fs->fs_journallocs[1] == 0 &&
@ -302,6 +325,15 @@ ffs_wapbl_start(struct mount *mp)
if (mp->mnt_flag & MNT_LOG) {
KDASSERT(fs->fs_ronly == 0);
/* WAPBL needs UFS2 format super block */
if (ffs_superblock_layout(fs) < 2) {
printf("%s fs superblock in old format, "
"not journaling\n",
VFSTOUFS(mp)->um_fs->fs_fsmnt);
mp->mnt_flag &= ~MNT_LOG;
return EINVAL;
}
error = wapbl_log_position(mp, fs, devvp, &off,
&count, &blksize, &extradata);
if (error)
@ -428,6 +460,13 @@ ffs_wapbl_replay_start(struct mount *mp, struct fs *fs, struct vnode *devvp)
size_t blksize;
uint64_t extradata;
/*
* WAPBL needs UFS2 format super block, if we got here with a
* UFS1 format super block something is amiss...
*/
if (ffs_superblock_layout(fs) < 2)
return EINVAL;
error = wapbl_log_position(mp, fs, devvp, &off, &count, &blksize,
&extradata);