linux-kernel - Re: [patch 7/7] vfs: mountinfo: show dominating group id

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Message-ID: <20080327224231.GA10722@ZenIV.linux.org.uk>
Date:	Thu, 27 Mar 2008 22:42:31 +0000
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Miklos Szeredi <miklos@...redi.hu>
Cc:	akpm@...ux-foundation.org, linuxram@...ibm.com,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [patch 7/7] vfs: mountinfo: show dominating group id

On Thu, Mar 27, 2008 at 01:06:26PM +0100, Miklos Szeredi wrote:
> +propagate_from:X  mount is slave and receives propagation from peer group X (*)
>  unbindable  mount is unbindable
>  
> +(*) X is the closest dominant peer group under the process's root.  If
> +X is the immediate master of the mount, or if there's no dominant peer
> +group under the same root, then only the "master:X" field is present
> +and not the "propagate_from:X" field.

Humm...  How does one distinguish between these variants?  Searching
in mountinfo for vfsmount with group ID of reported master?  We can
live with that, but it looks like a subtlety that will be cheerfully
forgotten by userland code.

Will do for now, but I think that we'll need that piece of documentation
more noticable and not so easy to overlook.
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