Re: [PATCH] quota: initialize dquot cache before mounting rootfs

[YouYou Yu]

Hi Jan,

Thanks for reviewing.

On Mon, 19 Oct 2026 12:44:49 +0200, Jan Kara wrote:
> I definitely don't think anybody sane wants quotas on initramfs. Is this
> just a fuzzing result or are you really interested in that functionality?

The truth is it's not a fuzzing result, we are really interested in it.
We run systems that extensively use rootfs and we want to limit per user
usage on it the same way tmpfs quotas allow on any other tmpfs mount.

> Instead of pulling quota into early boot I'd just refuse tmpfs mount in
> this case (same result as original behavior but clearer error message :)).

Refusing the mount would avoid the crash, but rootfs would then be
the only tmpfs instance where quotas can't be used, even though
initramfs_options= exists to pass mount options to it. That said, if
initializing this earlier is a concern, I'm happy to rework the patch
if you have a preferred approach.

Thanks,
YouYou