linux-kernel - Re: [PATCH 0/5] kernfs: add exportfs operations

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Message-ID: <20170523073941.GB29525@infradead.org>
Date:   Tue, 23 May 2017 00:39:41 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Shaohua Li <shli@...com>
Cc:     linux-kernel@...r.kernel.org, tj@...nel.org,
        gregkh@...uxfoundation.org, viro@...iv.linux.org.uk,
        Kernel-team@...com
Subject: Re: [PATCH 0/5] kernfs: add exportfs operations

On Mon, May 22, 2017 at 03:53:04PM -0700, Shaohua Li wrote:
> Hi,
> 
> The goal isn't to export kernfs to NFS. The intention is to make tracing cgroup
> aware. To do this, tracing will record an id for cgroup and use the id to find
> cgroup name later. The best id is the cgroup directory inode number. Further to
> filter out stale cgroup directory, fhandle is the best to identify a cgroup. So
> this is what this series try to do.

Eww.  Even if you need to maintain i_generation for that please don't
add the full export_operations.  People will just get stupid ideas based
on that.