The idea is to tell your disk drive how you might expect to use the data later, and it will just sort everything out for you. Promise.
Maybe we should just encode the T10 spec in the VFS and allow filesystems to accept exactly the same hints and do the same things. Or maybe not.
I think if you really need that sort of control, you should make it all much more explicit. Create a /hot filesystem and a /cold filesystem and let that be that.
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