btrfs: add a leak check for roots
Now that we're going to start relying on getting ref counting right for roots, add a list to track allocated roots and print out any roots that aren't freed up at free_fs_info time. Hide this behind CONFIG_BTRFS_DEBUG because this will just be used for developers to verify they aren't breaking things. Reviewed-by: NNikolay Borisov <nborisov@suse.com> Signed-off-by: NJosef Bacik <josef@toxicpanda.com> Reviewed-by: NDavid Sterba <dsterba@suse.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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