I'm not sure exactly what would happen on an inode collision, but I'm
guessing Bad Things. If my math is correct, a 2^32 inode space will
have roughly 1 collision per 2^16 entries. As that's only 65536,
that's not safe at all.
Yeah, the birthday paradox will make sure you hit it very soon. 8-(
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May the most significant bit of your life be positive.