I want to change a btrfs LUKS encrypted partition to ext4

[chrismurphy]

I replied with a link to a new discussion thread, but it is listed in-line above with an easy to miss subtle grey title. I’m posting it here for visibility, discussion can happen over there.

Btrfs on dm-crypt, improving chance of self-healing

Continuing the discussion from I want to change a btrfs LUKS encrypted partition to ext4: By default these days Btrfs uses DUP profile metadata, i.e. two copies of the file system. Originally it was single profile when on SSD. Why? Part of the rationalization of that choice at the time was awareness that many SSDs, even cheap ones, do an opportunistic dedup during concurrent writes. i.e. if the SSD firmware detects, in a concurrent write, the exact same data in two (and maybe more) blocks, it …