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Date:   Tue, 10 Aug 2021 16:11:25 +0200
From:   Christian Brauner <christian.brauner@ubuntu.com>
To:     "Michael Kerrisk (man-pages)" <mtk.manpages@gmail.com>
Cc:     Alejandro Colomar <alx.manpages@gmail.com>,
        linux-fsdevel <linux-fsdevel@vger.kernel.org>,
        lkml <linux-kernel@vger.kernel.org>,
        linux-man <linux-man@vger.kernel.org>,
        Christoph Hellwig <hch@infradead.org>
Subject: Re: Questions re the new mount_setattr(2) manual page
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On Tue, Aug 10, 2021 at 09:12:14AM +0200, Michael Kerrisk (man-pages) wrote:
> Hi Christian,
> 
> One more question...
> 
> >>       The propagation field is used to specify the propagation typ
> >>       of the mount or mount tree.  Mount propagation options are
> >>       mutually exclusive; that is, the propagation values behave
> >>       like an enum.  The supported mount propagation types are:
> 
> The manual page text doesn't actually say it, but if the 'propagation'
> field is 0, then this means leave the propagation type unchanged, 
> right? This of course should be mentioned in the manual page.

Yes, if none of the documented values is set the propagation is unchanged.

Christian