static void btrfs_release_delalloc_bytes(struct btrfs_root *root,
					 u64 start, u64 len)
{
	struct btrfs_block_group_cache *cache;

	cache = btrfs_lookup_block_group(root->fs_info, start);
	ASSERT(cache);

	spin_lock(&cache->lock);
	cache->delalloc_bytes -= len;
	spin_unlock(&cache->lock);

	btrfs_put_block_group(cache);
}

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