linux-kernel - Re: [PATCH 01/33] vfs: syscall: Add open_tree(2) to reference or clone a mount [ver #11]

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Message-ID: <21311.1533246718@warthog.procyon.org.uk>
Date:   Thu, 02 Aug 2018 22:51:58 +0100
From:   David Howells <dhowells@...hat.com>
To:     Alan Jenkins <alan.christopher.jenkins@...il.com>
Cc:     dhowells@...hat.com, viro@...iv.linux.org.uk,
        linux-api@...r.kernel.org, torvalds@...ux-foundation.org,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 01/33] vfs: syscall: Add open_tree(2) to reference or clone a mount [ver #11]

Alan Jenkins <alan.christopher.jenkins@...il.com> wrote:

> Another closely-related limitation of `mount`, is that it can't atomically set
> the propagation type at mount time.

I want to add a mount_setattr() too at some point:

	fd = open_tree(..., OPEN_TREE_CLONE);
	mount_setattr(fd, ...);
	move_mount(fd, ...);

I'm not sure whether you should be able to fchdir into the cloned tree since
it isn't attached to any mount namespace.

David