linux-kernel - Re: [PATCH 31/34] vfs: syscall: Add fspick() to select a superblock for reconfiguration [ver #12]

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Date:   Wed, 17 Oct 2018 16:24:23 +0100
From:   David Howells <dhowells@...hat.com>
To:     ebiederm@...ssion.com (Eric W. Biederman)
Cc:     dhowells@...hat.com,
        Alan Jenkins <alan.christopher.jenkins@...il.com>,
        Al Viro <viro@...IV.linux.org.uk>, linux-api@...r.kernel.org,
        torvalds@...ux-foundation.org, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, mszeredi@...hat.com
Subject: Re: [PATCH 31/34] vfs: syscall: Add fspick() to select a superblock for reconfiguration [ver #12]

Eric W. Biederman <ebiederm@...ssion.com> wrote:

> Davids check will work for bind mounts as well.  It just won't work it
> just won't work for files or subdirectories of some mountpoint.

Bind mounts have to be done with open_tree() and move_mount().  You can't now
do fsmount() on something fspick()'d.

David