[PATCH v3 3/3] fs: store real path instead of fake path in backing file f_path

[Al Viro]

On Tue, Oct 10, 2023 at 09:28:41PM +0300, Amir Goldstein wrote:
> > with making vm_user_file() do this:
> >         file = vma->vm_file;
> >         if (file && unlikely(file->f_mode & FMODE_BACKING))
> >                 file = backing_file(file)->user_file;
> >         return file;
> >
> > Voila.  Two-commit series, considerably smaller than your
> > variant...
> >
> 
> Yap. looks very nice.
> I will try that out tomorrow.
> 
> Anyway, it doesn't hurt to have the current version in linux-next
> for the night to see if the change from fake f_path to real f_path
> has any unexpected outcomes.

There is an obvious problem with that approach - refcounts don't
mix with loops ;-/  Sorry about the noise - this really won't work.