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Re: [PATCH 5/5] kernfs: add exportfs operations

From Christoph Hellwig <hch@infradead.org>
Newsgroups linux.kernel
Subject Re: [PATCH 5/5] kernfs: add exportfs operations
Date 2017-05-24 19:40 +0200
Message-ID <tKIqm-5iH-9@gated-at.bofh.it> (permalink)
References <tK4sV-3eD-3@gated-at.bofh.it> <tK4sW-3eD-5@gated-at.bofh.it> <tKcJQ-65-21@gated-at.bofh.it> <tKncd-77q-5@gated-at.bofh.it>
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On Tue, May 23, 2017 at 02:57:11PM -0400, Tejun Heo wrote:
> 
> Yeah, this is one of the repeatedly requested features - a cgroup id
> which can be looked up in a scalable way.  We probably should have
> added this earlier too as we already have places where we're passing
> in full cgroup path into the kernel (ipt_cgroup match).

I still have no idea how this ties into export ops.  Currently I don't
see any tracing code using export operations, so maybe a big part of
the series is missing/

> IIUC, Shaohua is adding it so that block tracing can be made aware of
> cgroups but something like this is necessary whenever we try to refer
> to a cgroup in a race-free / scalable way.

You can already get i_ino using statx, and i_generation using
FS_IOC_GETVERSION, so I'm a little lost on why you need the full
exportfs infrastructure.

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Thread

[PATCH 5/5] kernfs: add exportfs operations Shaohua Li <shli@fb.com> - 2017-05-23 01:00 +0200
  Re: [PATCH 5/5] kernfs: add exportfs operations Christoph Hellwig <hch@infradead.org> - 2017-05-23 09:50 +0200
    Re: [PATCH 5/5] kernfs: add exportfs operations Tejun Heo <tj@kernel.org> - 2017-05-23 21:00 +0200
      Re: [PATCH 5/5] kernfs: add exportfs operations Christoph Hellwig <hch@infradead.org> - 2017-05-24 19:40 +0200
        Re: [PATCH 5/5] kernfs: add exportfs operations Tejun Heo <tj@kernel.org> - 2017-05-24 19:50 +0200
          Re: [PATCH 5/5] kernfs: add exportfs operations Christoph Hellwig <hch@infradead.org> - 2017-05-24 19:50 +0200
            Re: [PATCH 5/5] kernfs: add exportfs operations Tejun Heo <tj@kernel.org> - 2017-05-24 19:50 +0200
  Re: [PATCH 5/5] kernfs: add exportfs operations Tejun Heo <tj@kernel.org> - 2017-05-23 21:00 +0200

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