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.


-- 
Chris Murphy
-- 
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