btrfs: tests: add extent_map tests for dropping with odd layouts
While investigating weird problems with the extent_map I wrote a self test testing the various edge cases of btrfs_drop_extent_map_range. This can split in different ways and behaves different in each case, so test the various edge cases to make sure everything is functioning properly. Reviewed-by: Filipe Manana <fdmanana@suse.com> Signed-off-by: Josef Bacik <josef@toxicpanda.com> Signed-off-by: David Sterba <dsterba@suse.com>
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