Re: [RFC] proc: don't show kernel-internal mnt_id in fdinfo (if possible)

[Dmitry Safonov]

On 11/07/2016 08:06 PM, Eric W. Biederman wrote:
> Dmitry Safonov <dsafonov@xxxxxxxxxxxxx> writes:
>
> > Some kernel special fs could be mounted by userspace, let's show
> > userspace mnt_id in those cases.
>
> You are asking the kernel to lie to userspace in the case when
> the truth in inconvenient.  That seems blantantly wrong.
>
> In the case of an internal mount you may want to use the device id
> of the device the filesystem is mounted on so you can tie all of
> the mounts together.  That would allow restore and other things
> to do something useful.
>
> That information is available with fstat on a file descriptor so I don't
> think we need to export it.  But if it is not available I can see
> the point of a patch.
>
> Outright ling to userpsace.  No.  That is just horrible.
>
> Nacked-by: "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx>

Ah, ok right, I see your point - then let's just drop the patch.

Thanks,
             Dmitry