diff options
Diffstat (limited to 'fs/reiserfs/super.c')
| -rw-r--r-- | fs/reiserfs/super.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/fs/reiserfs/super.c b/fs/reiserfs/super.c index b82897ae090b..57adfe90d5ae 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 */ |