Re: [PATCH 2/2] mountinfo: implement show_path for kernfs and cgroup

From: Tejun Heo
Date: Mon May 02 2016 - 12:33:47 EST

On Tue, Apr 26, 2016 at 09:36:23AM -0500, Serge E. Hallyn wrote:
> > In the ideal world there is no mountinfo file, but /proc/self/mountinfo/<id>/
> > directory with individual files, so every subsystem and filesystem has
> > absolute freedom to store there all relevant information. The result will
> > be also lucky kernel that does not have to always generate entire huge
> > mountinfo file for all mountpoins... etc. :-)
> Yeah mountinfo does seem like a big stick to swing around every time I want
> one little piece of information. Also mght be good to have per-fstype
> directories so we can just look under /proc/self/mountsdir/cgroupfs/ for
> only cgroupfs <id>s.
> There we might also find open fds for source and mountdir, kinda fitting
> in with previous discussions of separating bdev_open() and mountat().
> BTW, assuming this would in fact report source and mountpoint location
> with fds, these would really (through realpath) be reported relative to
> the reader's namespace, as I'm doing and advocating here.

So, what's the consensus here? Is everyone okay with the posted