Re: [PATCH] proc: show mnt_id in fdinfo files

From: Cyrill Gorcunov
Date: Mon Mar 17 2014 - 07:50:30 EST

On Mon, Mar 17, 2014 at 03:30:26PM +0400, Pavel Emelyanov wrote:
> On 03/17/2014 02:39 PM, 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.
> >
> > Cc: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
> > Cc: Oleg Nesterov <oleg@xxxxxxxxxx>
> > Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
> > Cc: Cyrill Gorcunov <gorcunov@xxxxxxxxxx>
> > Cc: Pavel Emelyanov <xemul@xxxxxxxxxxxxx>
> > Signed-off-by: Andrey Vagin <avagin@xxxxxxxxxx>
> These IDs are already shown in the /proc/$pid/mountinfo, and for some FSs
> can be obtained via path_to_handle_at(), so this patch just makes it work
> for any FS and speeds things up.
> Acked-by: Pavel Emelyanov <xemul@xxxxxxxxxxxxx>

I think Documentation/filesystems/proc.txt should be updated on top.
Other than that

Reviewed-by: Cyrill Gorcunov <gorcunov@xxxxxxxxxx>
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