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fs_info can be extracted from btrfs_block_group_cache, and all btrfs_block_group_cache is created by btrfs_create_block_group_cache() with fs_info initialized, no need to worry about NULL pointer dereference. Signed-off-by: Qu Wenruo <wqu@suse.com> Reviewed-by: Nikolay Borisov <nborisov@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>