linux-kernel - split receive_fd_replace from __receive

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Message-Id: <20210325082209.1067987-1-hch@lst.de>
Date:   Thu, 25 Mar 2021 09:22:08 +0100
From:   Christoph Hellwig <hch@....de>
To:     Al Viro <viro@...iv.linux.org.uk>
Cc:     linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        Kees Cook <keescook@...omium.org>,
        Andy Lutomirski <luto@...capital.net>,
        Will Drewry <wad@...omium.org>
Subject: split receive_fd_replace from __receive_fd

The receive_fd_replace case shares almost no logic with the more general
__receive_fd case, so split it into a separate function.

BTW, I'm not sure if receive_fd_replace is such a useful primitive to
start with, why not just open code it in seccomp?