linux-kernel - Re: [PATCH] proc: show mnt

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Message-ID: <20140320110352.GQ1728@moon>
Date:	Thu, 20 Mar 2014 15:03:52 +0400
From:	Cyrill Gorcunov <gorcunov@...il.com>
To:	Andrey Vagin <avagin@...nvz.org>
Cc:	linux-kernel@...r.kernel.org, criu@...nvz.org,
	Al Viro <viro@...iv.linux.org.uk>,
	Oleg Nesterov <oleg@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Rob Landley <rob@...dley.net>
Subject: Re: [PATCH] proc: show mnt_id in fdinfo files (v2)

On Thu, Mar 20, 2014 at 02:57:28PM +0400, Andrey Vagin wrote:
> Currently we don't have a way how to determing from which mount point
> file has been opened. This information is required for proper dumping
> and restoring file descriptos due to presence of mount namespaces. It's
> possible, that two file descriptors are opened using the same paths, but
> one fd references mount point from one namespace while the other fd --
> from other namespace.
> 
> $ ls -l /proc/1/fd/1
> lrwx------ 1 root root 64 Mar 19 23:54 /proc/1/fd/1 -> /dev/null
> 
> $ cat /proc/1/fdinfo/1
> pos:	0
> flags:	0100002
> mnt_id:	16
> 
> $ cat /proc/1/mountinfo | grep ^16
> 16 32 0:4 / /dev rw,nosuid shared:2 - devtmpfs devtmpfs rw,size=1013356k,nr_inodes=253339,mode=755
> 
> v2: update Documentation/filesystems/proc.txt
> 
> Cc: Al Viro <viro@...iv.linux.org.uk>
> Cc: Oleg Nesterov <oleg@...hat.com>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Cc: Cyrill Gorcunov <gorcunov@...nvz.org>
> Cc: Rob Landley <rob@...dley.net>
> Acked-by: Pavel Emelyanov <xemul@...allels.com>
> Signed-off-by: Andrey Vagin <avagin@...nvz.org>
Acked-by: Cyrill Gorcunov <gorcunov@...nvz.org>
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