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From:   Miklos Szeredi <mszeredi@redhat.com>
Date:   Mon, 7 May 2018 12:29:37 +0200
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Subject: Re: [PATCH v2 22/35] vfs: don't open real
To:     Amir Goldstein <amir73il@gmail.com>
Cc:     overlayfs <linux-unionfs@vger.kernel.org>,
        linux-fsdevel <linux-fsdevel@vger.kernel.org>,
        linux-kernel <linux-kernel@vger.kernel.org>,
        Al Viro <viro@zeniv.linux.org.uk>
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On Mon, May 7, 2018 at 12:27 PM, Amir Goldstein <amir73il@gmail.com> wrote:
> On Mon, May 7, 2018 at 11:37 AM, Miklos Szeredi <mszeredi@redhat.com> wrote:
>> Let overlayfs do its thing when opening a file.
>>
>> This enables stacking and fixes the corner case when a file is opened for
>> read, modified through a writable open, and data is read from the read-only
>> file.  After this patch the read-only open will not return stale data even
>> in this case.
>>
>
> So now you can get rid of ovl_do_check_copy_up() and the check_copy_up
> module param ;-)

Ah, forgot about that one.   Indeed.

Thanks,
Miklos