Re: [systemd-devel] [PATCH] Add syste-firmware-efi-efivars.mount for support automount EFI variable filesystem

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On Wed, Oct 24, 2012 at 2:12 PM, Zbigniew Jędrzejewski-Szmek
<zbyszek@xxxxxxxxx> wrote:
> On Wed, Oct 24, 2012 at 06:42:02PM +0800, Lee, Chun-Yi wrote:
>> Add units/sys-firmware-efi-efivars.mount rule for support automount EFI variable filesystem
>> ---
> Hi,
>
> in systemd parlance, automount means autofs mount, but to have that, a
> second .automount unit is needed.  Please have a look at
> http://cgit.freedesktop.org/systemd/systemd/tree/units/proc-sys-fs-binfmt_misc.automount
> vs
> http://cgit.freedesktop.org/systemd/systemd/tree/units/proc-sys-fs-binfmt_misc.mount .
> Now the question is whether the loading of the fs is slow enough to
> matter, ie. if it is actually beneficial to use automount instead of
> mounting directly.  Since the fs can be compiled as a module, than it
> probably is.
>
> Also, would be nice to add a Documentation= line like in
> proc-sys-fs-binfmt_misc.automount.

It might all not be worth it, and we might just add it to the
"unconditionally mounted" list in the compiled-in code (marked with
allowed-to-fail). It seems like the better option than having a mount
unit, and a module-load force option.

The current mount unit would never trigger for modules, because the
path will not exist. An internal API mount will cause a trransparent
kernel-forked modprobe with the mount() syscall.

Kay
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