this post was submitted on 31 Oct 2023
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Can't BTRFS be used on a LUKS volume? Or does it have disadvantages?
Yeppp this is what I currently do, and offers the best performance IMO compared to using something like gocryptfs in userspace on top of BTRFS. Pretty happy with it except a few small things...
It can be a bit of a faff to mount on a new machine if its file manager doesn't support encrypted volumes natively ☹️. On your daily you can have it all sorted in your crypttab and fstab so it's not an issue there
My main problem though is if it's an external USB device you have encrypted with LUKS, the handles and devices stay there after an unexpected USB disconnect... so you can't actually unmount or remount the dm-crypt device after that happens. Anytime you try, the kernel blocks you saying the device is busy - only fix i'm aware of is a reboot.
If the encryption is managed by the filesystem itself, one would probably assume this kind of mounting & unexpected disconnect scenario would be handled as gracefully as possible
I see, good points.
I have also experienced that dangling devices break remounting it, but I think there's a quicker solution for it:
dmsetup remove insert_device_name_here.It's still a manual thing, though, but 2 steps better. Maybe it can be automated somehow, I haven't looked into that yet.