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This patch will add the following trace events: 1) btrfs_remove_block_group For btrfs_remove_block_group() function. Triggered when a block group is really removed. 2) btrfs_add_unused_block_group Triggered which block group is added to unused_bgs list. 3) btrfs_skip_unused_block_group Triggered which unused block group is not deleted. These trace events is pretty handy to debug case related to block group auto remove. Signed-off-by: Qu Wenruo <wqu@suse.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>