Re: Setting ->s_dev to a char device (Was: Re: [PATCH v2] ubifs: allow userspace to map mounts to volumes)

[Rabin Vincent]

On Mon, May 29, 2017 at 01:08:25PM +0100, Al Viro wrote:
> Userspace sure as hell does.  st_dev in stat(2) is a block device number;
> moreover, there might _be_ a block device with the same number at the same
> time - even mounted.  Why not make ->show_options() print the currently
> valid volume name, anyway?  That would seem to be the obvious approach...

The following patch works for me, if it's OK to show options that can't
actually be used when mounting:

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