linux-kernel - Re: [PATCH] x86: defconfig: Enable CONFIG

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Message-ID: <20141130205430.GD16151@dastard>
Date:	Mon, 1 Dec 2014 07:54:30 +1100
From:	Dave Chinner <david@...morbit.com>
To:	Richard Weinberger <richard@....at>
Cc:	x86@...nel.org, tglx@...utronix.de, mingo@...hat.com,
	hpa@...or.com, gregkh@...uxfoundation.org,
	rafael.j.wysocki@...el.com, pebolle@...cali.nl,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86: defconfig: Enable CONFIG_FHANDLE

On Wed, Nov 26, 2014 at 12:36:52AM +0100, Richard Weinberger wrote:
> systemd has a hard dependency on CONFIG_FHANDLE.
> If you run systemd with CONFIG_FHANDLE=n it will somehow
> boot but fail to spawn a getty or other basic services.
> As systemd is now used by most x86 distributions it
> makes sense to enabled this by default and save kernel
> hackers a lot of value debugging time.

The bigger question to me is this: why does systemd need to
store/open by handle rather than just opening paths directly when
needed? This interface is intended for stable, pathless access to
inodes across unmount/mount contexts (e.g. userspace NFS servers,
filesystem backup programs, etc) so I'm curious as to the problem
systemd is solving using this interface. I just can't see the
problem being solved here, and why path based security checks on
every open() aren't necessary...

Cheers,

Dave.
-- 
Dave Chinner
david@...morbit.com
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