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

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Message-Id: <20080116143051.ec488f3d.akpm@linux-foundation.org>
Date:	Wed, 16 Jan 2008 14:30:51 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Miklos Szeredi <miklos@...redi.hu>
Cc:	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 Wed, 16 Jan 2008 23:12:31 +0100
Miklos Szeredi <miklos@...redi.hu> wrote:

> The reason, why this patch was dug up, is that if the bdi-sysfs patch
> is going to use device numbers to identify BDIs, then there should be
> a way for the user to map the device number into mount(s).
> 
> But it's useful regardless of the bdi-sysfs patch.

Don't know what that is.

> Can this be added to -mm?
> 
> In theory it could break userspace, but I think it's very unlikely to
> do so, because stuff is added only at the end of the lines, and
> because most programs probably parse it through the libc interface
> which is not broken by this change.  Despite this, it should be tested
> on as many systems as possible.

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.

> - for mount ID's use IRA instead of a 32bit counter, which could overflow

don't know what an IRA is.

> - print canonical ID's (smallest one within the peer group) for peers
>   and master, this is more useful, than a random ID within the same namespace
> - fix a couple of small bugs
> - style fixes
> 
> Signed-off-by: Ram Pai <linuxram@...ibm.com>
> Signed-off-by: Miklos Szeredi <mszeredi@...e.cz>

Both the newly-added inlines in this patch are wrong.  They will result in
a larger and slower kernel.  This should be very well known by now.

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