linux-kernel - Re: [patch 01/26] mount options: add documentation

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Date:	Wed, 30 Jan 2008 02:54:04 +0100
From:	Roman Zippel <zippel@...ux-m68k.org>
To:	Miklos Szeredi <miklos@...redi.hu>
Cc:	akpm@...ux-foundation.org, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org, Steve French <sfrench@...ibm.com>,
	Lachlan McIlroy <lachlan@....com>,
	"Josef 'Jeff' Sipek" <jsipek@...sunysb.edu>,
	Russell King <rmk@....linux.org.uk>,
	David Howells <dhowells@...hat.com>,
	Ian Kent <raven@...maw.net>,
	"Sergey S. Kostyliov" <rathamahata@...4.ru>,
	Karsten Keil <kkeil@...e.de>, "H. Peter Anvin" <hpa@...or.com>,
	"Theodore Ts'o" <tytso@....edu>,
	OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>,
	Jeff Dike <jdike@...toit.com>,
	Mikulas Patocka <mikulas@...ax.karlin.mff.cuni.cz>,
	William Irwin <wli@...omorphy.com>,
	Dave Kleikamp <shaggy@...tin.ibm.com>,
	Petr Vandrovec <vandrove@...cvut.cz>,
	Trond Myklebust <Trond.Myklebust@...app.com>,
	Jeff Mahoney <jeffm@...e.com>,
	Paul Mackerras <paulus@...ba.org>,
	Hugh Dickins <hugh@...itas.com>,
	Cyrill Gorcunov <gorcunov@...il.com>,
	Greg Kroah-Hartman <gregkh@...e.de>
Subject: Re: [patch 01/26] mount options: add documentation

Hi,

On Thursday 24. January 2008, Miklos Szeredi wrote:

> Q: Why do we need correct option showing in /proc/mounts?
> A: We want /proc/mounts to fully replace /etc/mtab.  The reasons for
>    this are:
>     - unprivileged mounters won't be able to update /etc/mtab
>     - /etc/mtab doesn't work with private mount namespaces
>     - /etc/mtab can become out-of-sync with reality

I asked this before and I don't remember getting an answer:
How does this deal with certain special cases:
- chroot: how will mount/df only show the for chroot relevant mounts?
- loop: how is the connection between file and loop device maintained?

I don't quite see how you want to achieve a _full_ replacement.

Could also please explain why you want to go via user mounts. Other OS use a 
daemon for that, which e.g. can maintain access controls. How do you want to 
manage this?

bye, Roman
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