linux-kernel - Re: [patch] VFS: extend /proc/mounts

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Message-ID: <18318.41541.386224.301640@notabene.brown>
Date:	Thu, 17 Jan 2008 11:33:09 +1100
From:	Neil Brown <neilb@...e.de>
To:	Jan Engelhardt <jengelh@...putergmbh.de>
Cc:	Karel Zak <kzak@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Miklos Szeredi <miklos@...redi.hu>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	util-linux-ng@...r.kernel.org, linuxram@...ibm.com,
	viro@....linux.org.uk, hch@...radead.org, a.p.zijlstra@...llo.nl
Subject: Re: [patch] VFS: extend /proc/mounts

On Thursday January 17, jengelh@...putergmbh.de wrote:
> 
> On Jan 17 2008 00:43, Karel Zak wrote:
> >> 
> >> Seems like a plain bad idea to me.  There will be any number of home-made
> >> /proc/mounts parsers and we don't know what they do.
> >
> > So, let's use /proc/mounts_v2  ;-)
> 
> Was not it like "don't use /proc for new things"?

I thought it was "don't use /proc for new things that aren't process
related".

And as the mount table is per process......

A host has a bunch of mounted filesystems (struct super_block), and
each process has some subset of these stitched together into a mount
tree (struct vfsmount / struct namespace).

There needs to be something in /proc that exposes the vfsmount tree.

Arguably there should be something else - maybe in sysfs - that
provides access to the "struct superblock" object.

And there needs to be a clear way to relate information from one with
information from the other.

In the tradition of stat, statm, status, maybe the former should be
 /proc/$PID/mountm
:-)

Hey, I just found /proc/X/mountstats.  How does this fit in to the big
picture?

NeilBrown
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