btrfs: disallow unequal data/metadata blocksize for mixed block groups

With support for bigger metadata blocks, we must avoid mounting a
filesystem with different block size for mixed block groups, this causes
corruption (found by xfstests/083).

Signed-off-by: David Sterba <dsterba@suse.cz>

1 files changed, 8 insertions, 0 deletions

diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 38c2ee1ca0d5..fe087847c8e7 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -2302,6 +2302,14 @@ int open_ctree(struct super_block *sb,
                 goto fail_sb_buffer;
         }
 
+        if ((features & BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS) &&
+                        (leafsize != nodesize || sectorsize != nodesize)) {
+                printk(KERN_WARNING "btrfs: unequal leaf/node/sector sizes "
+                                "are not allowed for mixed block groups on %s\n",
+                                sb->s_id);
+                goto fail_sb_buffer;
+        }
+
         mutex_lock(&fs_info->chunk_mutex);
         ret = btrfs_read_sys_array(tree_root);
         mutex_unlock(&fs_info->chunk_mutex);