linux-kernel - Re: [PATCH bpf-next v3 2/4] libfs: support RENAME_EXCHANGE in simple

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Message-ID: <CAJfpegvPrQBnYO3XNcCHODBBCXm6uH73zOWXs+sfn=3LQmMyww@mail.gmail.com>
Date:   Tue, 2 Nov 2021 10:25:10 +0100
From:   Miklos Szeredi <miklos@...redi.hu>
To:     Lorenz Bauer <lmb@...udflare.com>
Cc:     Al Viro <viro@...iv.linux.org.uk>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Miklos Szeredi <mszeredi@...hat.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        network dev <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>
Subject: Re: [PATCH bpf-next v3 2/4] libfs: support RENAME_EXCHANGE in simple_rename()

On Thu, 28 Oct 2021 at 11:48, Lorenz Bauer <lmb@...udflare.com> wrote:
>
> Allow atomic exchange via RENAME_EXCHANGE when using simple_rename.
> This affects binderfs, ramfs, hubetlbfs and bpffs.

Ramfs and hugetlbfs are generic enough; those seem safe.

Binderfs: I have no idea what this does; binderfs_rename() should
probably error out on RENAME_EXCHANGE for now, or an explicit ack from
the maintainers.

Bpffs is your baby...

Thanks,
Miklos