linux-kernel - Re: [PATCH 1/2] fs: Add fd

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Date:   Mon, 3 Aug 2020 23:18:54 +0100
From:   Al Viro <viro@...iv.linux.org.uk>
To:     Kalesh Singh <kaleshsingh@...gle.com>
Cc:     Jonathan Corbet <corbet@....net>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...hat.com>, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-media@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, linaro-mm-sig@...ts.linaro.org,
        linux-fsdevel@...r.kernel.org,
        Suren Baghdasaryan <surenb@...gle.com>,
        Hridya Valsaraju <hridya@...gle.com>,
        Ioannis Ilkos <ilkos@...gle.com>,
        John Stultz <john.stultz@...aro.org>, kernel-team@...roid.com
Subject: Re: [PATCH 1/2] fs: Add fd_install file operation

On Mon, Aug 03, 2020 at 02:47:18PM +0000, Kalesh Singh wrote:
> Provides a per process hook for the acquisition of file descriptors,
> despite the method used to obtain the descriptor.

No, with the side of Fuck, No.

Driver has no possible reason to watch know the descriptors involved.
Moreover, it has no possible way to track that information _and_
no locking that could make that viable.

NAKed with extreme prejudice - never bring that idea back.