Doesn't the first paragraph of the article talk about the history of hash collision attacks? Or are you talking about some other way in which this is not a new

Doesn't the first paragraph of the article talk about the history of hash collision attacks? Or are you talking about some other way in which this is not a new attack? Also, looking at his numbers, btrfs is doing something very wrong, over simple hash collisions. A file system which takes over 5 seconds to make 61 files is simply broken (in this situation, not making general comments about btrfs).