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Grub doesn't recognize ext4 with large_dir

From: John Kehayias
Subject: Grub doesn't recognize ext4 with large_dir
Date: Thu, 26 Aug 2021 04:40:53 +0000


Grub doesn't support partitions with ext4 and the large_dir feature enabled (it 
will error with unknown filesystem). This is true for both grub-install and if 
trying to boot a partition with large_dir (i.e. the Linux image is on there, 
not in the same partition as Grub).

(This bit me rather hard when enabling this on a system and then unable to boot 
to it. To workaround I had to move the Linux and initrd images to the same 
partition as Grub and rewrite the configuration. large_dir can't be set off as 
far as I can tell. This is not ideal for my current setup on Guix, but should 
be able to work around it with some help.)

Since large_dir has been around for some time, and supported in the kernel 
since 4.13, are there any plans to support this in Grub? I would say this seems 
very reasonable, but unfortunately do not know enough about the internals to 
see what work is involved.


PS: Please also cc me directly as I am not currently subscribed to bug-grub.

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