linux-kernel - Re: [PATCH 03/34] teach move_mount(2) to work with OPEN_TREE

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Message-ID: <10542.1539985206@warthog.procyon.org.uk>
Date:   Fri, 19 Oct 2018 22:40:06 +0100
From:   David Howells <dhowells@...hat.com>
To:     Alan Jenkins <alan.christopher.jenkins@...il.com>
Cc:     dhowells@...hat.com, viro@...iv.linux.org.uk,
        torvalds@...ux-foundation.org, ebiederm@...ssion.com,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        mszeredi@...hat.com
Subject: Re: [PATCH 03/34] teach move_mount(2) to work with OPEN_TREE_CLONE [ver #12]

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

> I guess this tries to fix the second of the two sequences I mentioned - 
> mount+unmount, then close the FD.  It doesn't seem to work.

It fixes this:

    unshare --mount
    /root/test-fsmount
    mount --move . /mnt
    mount --move /mnt /mnt
    cd
    umount /mnt
    exit

Which usually gets a GPF in fsnotify.

David