this post was submitted on 10 Nov 2023
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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.
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Filesystems aren't so simple. Modern advanced filesystems like btrfs, zfs and bcachefs are more than just filesystems.
E.g. they include features like volume management, compression and sometimes encryption. Most features can also be achieved with for example ext4 + lvm + luks, but it's nice to have all in one system with unified configuration.
tl;dr
Btrfs does more than ext4, which can have a negative performance impact, depending on the use case/metric. Usually the features gained by btrfs outweigh the small difference in performance imo.
Oh. So I didn't need LVM and LUKS at my install?
Btrfs doesn't do encryption, so luks is still necessary. LVM isn't needed since btrfs subvolumes achieve the same in a more flexible way (no fixed size, snapshots).
Btrfs doesn't have built in encryption, if you want to encrypt Btrfs you still need another layer (e.g. LUKS).