在 2026/7/2 16:35, Daniel Vacek 写道:
[...]
A simple tree dump can always show which range is hole and which is
preallocated.
Yeah, that's true. I'm curious how other FSes handle this. Let me see.
Or do you know from the top of your head?
Sorry, not familiar with other fscrypt implementation at all.
You may want to try to experiment on ext4 to see how it's implemented.
I guess they do nothing special and just expose hole/prealloc info.
As the other path would be always filling hole with zero filled regular
extents (before encryption), and disable preallocation completely.
That looks over-killed and may take a lot of extra space.
