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Authenticated Btrfs

Authenticated Btrfs

Posted May 1, 2020 20:00 UTC (Fri) by dcg (subscriber, #9198)
In reply to: Authenticated Btrfs by cyphar
Parent article: Authenticated Btrfs

In Btrfs it would be theoretically possible to add yet another tree to the forest, so you could have both a csum tree and a hmac tree (it may even be possible to shoehorn the hmac items into the csum tree in some way). But I'm not sure how valuable are these features for developers, btrfs has already been pretty disappointing when it comes to encryption.

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Authenticated Btrfs

Posted May 1, 2020 20:15 UTC (Fri) by jeffm (subscriber, #29341) [Link]

It would be possible to modify the csum tree (or create a new tree) to do this for data, but metadata checksums are in the header for every tree node. Changing the size would be an incompatible disk format change. It's not impossible but it's a big barrier.


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