linux-kernel - Re: [RFC PATCH] overlayfs: add OVL_IOC_GETINFOFD ioctl that opens ovlinfofd

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Date:   Tue, 6 Oct 2020 11:54:33 +0200
From:   Miklos Szeredi <miklos@...redi.hu>
To:     Alexander Mikhalitsyn <alexander.mikhalitsyn@...tuozzo.com>
Cc:     Amir Goldstein <amir73il@...il.com>,
        Randy Dunlap <rdunlap@...radead.org>,
        Andrei Vagin <avagin@...il.com>,
        Pavel Tikhomirov <ptikhomirov@...tuozzo.com>,
        David Howells <dhowells@...hat.com>,
        overlayfs <linux-unionfs@...r.kernel.org>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH] overlayfs: add OVL_IOC_GETINFOFD ioctl that opens ovlinfofd

On Mon, Oct 5, 2020 at 9:40 PM Alexander Mikhalitsyn
<alexander.mikhalitsyn@...tuozzo.com> wrote:

> Oh, yes, it's just another one choice for us ;)
> I decided to create ioctl which opens fd for transferring
> data about overlayfs.
> Sure, let's look on sys fs. I will dive into it!

Or maybe use fsinfo(2) or whatever it's going to be called?

That one seems stuck at the moment, but having a clear set of use
cases can possibly help move it forward.

Thanks,
Miklos