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I have studied it deeply and now I want to contribute with an idea that could be used for next versions from ext4 and ahead It's a simple thing that is fully compatible with current Ext4 version and will improve space efficiency. I don't really want to write code, just transfer my vision to an already envolved and competent programmer that is working on ext4 development. PS: I have contributed to other free open source projects. My name is present in the Greasemonkey Mozilla extension (js expert) and as TuxGuitar as translator. Now I just wanted to share a tech insight that would improve ext4 efficiency even more. Best Regards Sergio Abreu - Brazilian developer since the year 2001