[PATCH v3 06/38] fs: add id translation helpers

[Christian Brauner]

On Tue, Dec 01, 2020 at 11:49:27AM +0100, Christoph Hellwig wrote:
> Looks good,
> 
> Reviewed-by: Christoph Hellwig <hch at lst.de>

I've adapted variable naming in this patch. Instead of referring to the
target ns as "to" I'm referring to it as "mnt_userns" as Serge
requested. There are no semantical changes so I've kept your Reviewed-by
on this patch.

Thanks!
Christian