this post was submitted on 31 Oct 2023
99 points (97.1% liked)
Linux
48209 readers
1459 users here now
From Wikipedia, the free encyclopedia
Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
Rules
- Posts must be relevant to operating systems running the Linux kernel. GNU/Linux or otherwise.
- No misinformation
- No NSFW content
- No hate speech, bigotry, etc
Related Communities
Community icon by Alpár-Etele Méder, licensed under CC BY 3.0
founded 5 years ago
MODERATORS
you are viewing a single comment's thread
view the rest of the comments
view the rest of the comments
Built-in encryption in bcachefs sounds great, that's the only thing that BTRFS has been missing for me so far.
Bonus points if it can be decrypted on boot like LUKS, and double bonus points if its scriptable like cryptsetup (retrieve key from hardware device, or network, or flash stick etc)
https://bcachefs.org/Encryption/
Will likely give bcachefs a spin as soon as it drops in Debian Unstable 😁
Triple bonus points if it can do swap files on the encrypted filesystem.
Does it lockup like ZFS?
Dunno yet. I'm going to remain optimistic until then.
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.