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>
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 38c2ee1..fe08784 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -2302,6 +2302,14 @@
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);
