On 10/27/25 10:39 PM, Chris Murphy wrote:
On Fri, Oct 24, 2025, at 5:52 PM, Samuel Sieb wrote:
Compression is easy to remove. Just remove the ",compress=zstd:1" part
of the entry in the /etc/fstab file. It's not retroactive though, so
any files that are already compressed will stay that way until
rewritten. It's also per subvolume, so if it's only your /home files
that you're concerned about, you can leave compression on for /.
Although given your earlier actions, /home might actually be part of /
now instead of being a separate subvolume.
Sorry, but it's confusing. Some options are VFS, others are file system
specific. The VFS options aren't Btrfs options at all, but look like they're
per subvolume because subvolume mounts are really bind mounts behind the scene.
And separate bind mounts can have separate VFS mount options.
Compression is a Btrfs mount option and it applies only file system wide. It
appears on every line in fstab as an artifact of the installer. The `/` line in
fstab is unique in that it becomes a remount command. Everything else in fstab
is either a new mount (other file systems) or additional bind mounts if it's
the same Btrfs file system as `/` -
In effect, the compression option for other subvolumes of the same file system
don't matter, have no effect, because they aren't remounts.
I must have misread the docs earlier, because it does seem clear now.
https://btrfs.readthedocs.io/en/latest/Compression.html#how-to-enable-compression
> Typically the compression can be enabled on the whole filesystem,
specified for the mount point. Note that the compression mount options
are shared among all mounts of the same filesystem, either bind mounts
or subvolume mounts.
I don't know why they added the "typically", but it is clear that it
applies to all the mounted subvolumes.
--
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