linux-ext4 - Re: [PATCH 1/3] ext2: show all mount options

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Message-Id: <E1IDCg3-0007OH-00@dorka.pomaz.szeredi.hu>
Date:	Tue, 24 Jul 2007 07:11:19 +0200
From:	Miklos Szeredi <miklos@...redi.hu>
To:	tytso@....edu
CC:	akpm@...ux-foundation.org, miklos@...redi.hu,
	linux-ext4@...r.kernel.org
Subject: Re: [PATCH 1/3] ext2: show all mount options

> The idea is to allow /proc/mounts to display all of the mount options
> that were used to mount a particular filesystem.  This is useful if
> you want /proc/mounts to replace /etc/mtab.
> 
> I keep thinking that this is really the wrong approach, though, since
> it means adding a lot of coding to every single filesystem to
> reconstruct the mount options, and in some cases it will still never
> be enough to reconstruct exactly what was in /etc/mtab.  (For example,
> the fully qualified domain named passed into some remote filesystem.)
> 
> It seems to me the right answer would be to enhance the mount(2)
> system call with a new mount operation which would allow the user
> space mount command can stash exactly the options used to mount the
> filesystem.

Well, that would be good for emulating /etc/mtab.  But the problem is
that that's wrong a lot of times.  For example in ext* "mount
-oremount,opt" doesn't reset all options, it just changes "opt".  And
this is different from fs to fs, so there's no easy way to handle it
from generic code.

I think it shouln't be hard to keep the shown mount options in sync
with the parsed options.  The problem is just that people have been
lazy to do that, because /etc/mtab was good enough.

Miklos
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