[linux-lvm] discard with luks and the FS itself

[lejeczek]

hi everyone

I realize question does not pertain LVM directly but knowing 
that on the list wonder around some very crypt-savvy  
guys&gals I thought I'd ask:

Does one have to flag mounts with discard for both crypttab 
and fstab in order for TRIM to be in effect?
Or just one? Just crypttab?

I've searched but failed to find an ultimate answer.
b.w.
L.
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