From mboxrd@z Thu Jan  1 00:00:00 1970
From: Roman Zippel <zippel@linux-m68k.org>
Subject: Re: [patch 01/26] mount options: add documentation
Date: Wed, 30 Jan 2008 02:54:04 +0100
Message-ID: <200801300254.06363.zippel@linux-m68k.org>
References: <20080124193341.166753833@szeredi.hu> <20080124193416.379218079@szeredi.hu>
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Cc: akpm@linux-foundation.org, linux-fsdevel@vger.kernel.org,
	linux-kernel@vger.kernel.org, Steve French <sfrench@us.ibm.com>,
	Lachlan McIlroy <lachlan@sgi.com>,
	"Josef 'Jeff' Sipek" <jsipek@cs.sunysb.edu>,
	Russell King <rmk@arm.linux.org.uk>,
	David Howells <dhowells@redhat.com>,
	Ian Kent <raven@themaw.net>,
	"Sergey S. Kostyliov" <rathamahata@php4.ru>,
	Karsten Keil <kkeil@suse.de>, "H. Peter Anvin" <hpa@zytor.com>,
	"Theodore Ts'o" <tytso@mit.edu>,
	OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>,
	Jeff Dike <jdike@addtoit.com>,
	Mikulas Patocka <mikulas@artax.karlin.mff.cuni.cz>,
	William Irwin <wli@holomorphy.com>,
	Dave Kleikamp <shaggy@austin.ibm.com>,
	Petr Vandrovec <vandrove@vc.cvut.cz>,
	Trond Myklebust <Trond.Myklebust@netapp.com>,
	Jeff Mahoney <jeffm@suse.com>,
	Paul Mackerras <paulus@samba.org>,
	Hugh Dickins <hugh@veritas.com>,
	Cyrill Gorcunov <gorcunov@gmail.com>,
	Gr
To: Miklos Szeredi <miklos@szeredi.hu>
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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