[bug#50768] [PATCH] installer: Reorder file system type listbox.

[John Kehayias]

Hello,

On this front, a related issue has been ext4 and large directories in Guix. 
Namely, that /gnu/store/.links quickly has many, many files (I'm at 9.9 million 
right now). This leads to warnings on ext4 and usually one will find that 
enabling large_dir will increase the file directory cap. Unfortunately, that is 
not compatible with Grub. This is what happened to me and was a bit of a mess 
(I reinstalled with Btrfs), and I know you (Tobias) also saw this in this 
thread: https://lists.gnu.org/archive/html/help-guix/2020-06/msg00015.html

So to the patch at hand, I'm wondering if we should make a note of this in file 
system selection in the installer (and in the manual in a few places). I don't 
know the actual ramifications of getting those directory full warnings in ext4, 
but I can see it easily leading to a problem booting a system with large_dir, 
as happened to me. I've submitted a bug to Grub, though this is well known, 
without response in plans to support a 4-year-old ext4 option. Since we expect 
Guix to have this huge directory, at least currently, I think we could avoid 
this issue with some warnings.

Sorry if this is a little astray for this patch, but thought it would be good 
to bring up.

Thanks,
John