linux-kernel - Re: [PATCH v2] vfs: prevent copy_file

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Message-ID: <CAOQ4uxgreB=TywvWQXfcHYMBcFm5OKSdwUC8YJY1WuVja6PccQ@mail.gmail.com>
Date:   Thu, 18 Feb 2021 11:10:00 +0200
From:   Amir Goldstein <amir73il@...il.com>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     Luis Henriques <lhenriques@...e.de>,
        Jeff Layton <jlayton@...nel.org>,
        Steve French <sfrench@...ba.org>,
        Miklos Szeredi <miklos@...redi.hu>,
        Trond Myklebust <trond.myklebust@...merspace.com>,
        Anna Schumaker <anna.schumaker@...app.com>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        "Darrick J. Wong" <darrick.wong@...cle.com>,
        Dave Chinner <dchinner@...hat.com>,
        Greg KH <gregkh@...uxfoundation.org>,
        Nicolas Boichat <drinkcat@...omium.org>,
        Ian Lance Taylor <iant@...gle.com>,
        Luis Lozano <llozano@...omium.org>,
        ceph-devel <ceph-devel@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        CIFS <linux-cifs@...r.kernel.org>,
        samba-technical <samba-technical@...ts.samba.org>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        Linux NFS Mailing List <linux-nfs@...r.kernel.org>
Subject: Re: [PATCH v2] vfs: prevent copy_file_range to copy across devices

On Thu, Feb 18, 2021 at 9:42 AM Christoph Hellwig <hch@...radead.org> wrote:
>
> Looks good:
>
> Reviewed-by: Christoph Hellwig <hch@....de>
>
> This whole idea of cross-device copie has always been a horrible idea,
> and I've been arguing against it since the patches were posted.

Ok. I'm good with this v2 as well, but need to add the fallback to
do_splice_direct()
in nfsd_copy_file_range(), because this patch breaks it.

And the commit message of v3 is better in describing the reported issue.

Thanks,
Amir.