summaryrefslogtreecommitdiffstats
path: root/fs/reiserfs/super.c
diff options
context:
space:
mode:
Diffstat (limited to 'fs/reiserfs/super.c')
-rw-r--r--fs/reiserfs/super.c15
1 files changed, 15 insertions, 0 deletions
diff --git a/fs/reiserfs/super.c b/fs/reiserfs/super.c
index b82897a..57adfe9 100644
--- a/fs/reiserfs/super.c
+++ b/fs/reiserfs/super.c
@@ -1725,6 +1725,21 @@ static int reiserfs_fill_super(struct super_block *s, void *data, int silent)
set_sb_umount_state(rs, REISERFS_ERROR_FS);
set_sb_fs_state(rs, 0);
+ /* Clear out s_bmap_nr if it would wrap. We can handle this
+ * case, but older revisions can't. This will cause the
+ * file system to fail mount on those older implementations,
+ * avoiding corruption. -jeffm */
+ if (bmap_would_wrap(reiserfs_bmap_count(s)) &&
+ sb_bmap_nr(rs) != 0) {
+ reiserfs_warning(s, "super-2030: This file system "
+ "claims to use %u bitmap blocks in "
+ "its super block, but requires %u. "
+ "Clearing to zero.", sb_bmap_nr(rs),
+ reiserfs_bmap_count(s));
+
+ set_sb_bmap_nr(rs, 0);
+ }
+
if (old_format_only(s)) {
/* filesystem of format 3.5 either with standard or non-standard
journal */
OpenPOWER on IntegriCloud