Format advice required about securefs HOT 4 CLOSED

The format numbers are chronologically numbered. It doesn't mean that 3 is better than 2 or 1. Concretely, the difference between 3 and 2 is that 3 stores the timestamps (access time, mod time, inode time and birth time) encrypted in the meta file, while 2 just let the underlying file system handles them. 3 has larger overhead, so not recommended for average users, unless they have those specific needs.

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So in effect it appears that format 1-3 are now more format subversions like 1.1 etc and in this case would suggest to introduce such kind of numbering.

If designed from scratch, those would be the numbers. Now I have to maintain backwards compatibility.

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The file system format with a given version never change. The vulnerability is with key generation.

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Thanks for pointing out, clear now to me

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