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From:   Amir Goldstein <amir73il@gmail.com>
Date:   Mon, 7 May 2018 13:27:19 +0300
Message-ID: <CAOQ4uxi-_0xkSgHnzBhJLnWTyz_m0VXTx9206k2vZA6dgtQYmQ@mail.gmail.com>
Subject: Re: [PATCH v2 22/35] vfs: don't open real
To:     Miklos Szeredi <mszeredi@redhat.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 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 ;-)

Thanks,
Amir.