linux-kernel - Re: Adding subroot information to /proc/mounts, or obtaining that through other means

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Message-ID: <87sl8l14d8.fsf@hades.wkstn.nix>
Date:	Thu, 21 Jun 2007 20:42:27 +0100
From:	Nix <nix@...eri.org.uk>
To:	Miklos Szeredi <miklos@...redi.hu>
Cc:	hpa@...or.com, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, util-linux-ng@...r.kernel.org
Subject: Re: Adding subroot information to /proc/mounts, or obtaining that through other means

On 21 Jun 2007, Miklos Szeredi said:
> I'm working on this actually.  See this (and related patches) in -mm:
>
>   http://www.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.22-rc4/2.6.22-rc4-mm2/broken-out/unprivileged-mounts-add-user-mounts-to-the-kernel.patch
>
> This solves the "user=" thing, but is not a generic solution for other
> options.  And I'm wondering if there is really a need for that.

I'm not sure there is, actually...

> Which quota options are you thinking about?  Some quota options
> (e.g. for ext*) seem to be already present in /proc/mounts.

... last I checked, usrquota and grpquota weren't being propagated in,
but that's changed sometime in the last, um, wow, has it been two
years already? Perhaps I should have checked again before babbling
nonsense to an audience of thousands, sorry!

> Do you know any other options which are only in /etc/mtab, and need to
> be stored along with each mount?

None presently, but in general it seems strange to have to modify the
kernel in order to be able to reliably associate some new key/value pair
with a mount point, let alone to have to do it on a filesystem-by-
filesystem basis...

-- 
`... in the sense that dragons logically follow evolution so they would
 be able to wield metal.' --- Kenneth Eng's colourless green ideas sleep
 furiously
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