btrfs: assert block group is locked in btrfs_use_block_group_size_class()

It's supposed to be called with the block group locked, in order to read
and set its size_class member, so assert it's locked.

Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/fs/btrfs/block-group.c b/fs/btrfs/block-group.c
index 635143a8eb07922b20bddb687d542127d52b33d7..11ed303c664097b989a543d5d8afb1bf64fcadcd 100644 (file)
--- a/fs/btrfs/block-group.c
+++ b/fs/btrfs/block-group.c
@@ -4755,6 +4755,7 @@ int btrfs_use_block_group_size_class(struct btrfs_block_group *bg,
                                     enum btrfs_block_group_size_class size_class,
                                     bool force_wrong_size_class)
 {
+       lockdep_assert_held(&bg->lock);
        ASSERT(size_class != BTRFS_BG_SZ_NONE);
 
        /* The new allocation is in the right size class, do nothing */