Re: [PATCH v2 2/3] init/do_cmounts.c: introduce 'user_root' for initramfs

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On Tue, May 25, 2021 at 10:23:09PM -0500, Eric W. Biederman wrote:
> If we are going to do this something that is so small and clean it can
> be done unconditionally always.
[...]
> The net request as I understand it: Make the filesystem the initramfs
> lives in be an ordinary filesystem so it can just be used as the systems
> primary filesystem.

Including the ability to pivot_root it away, which seems like the main
sticking point.

If this can be done without any overhead, that seems fine, but if this
involves mounting an extra filesystem, that may add an appreciable
amount of boot time for systems trying to boot in milliseconds. (Such
systems would not use an initramfs if they're going to go on and boot a
separate root filesystem, but they can use an initramfs as their *only*
filesystem.)



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