linux-kernel - Re: [RFC][PATCH 4/3] vfs: Allow rmdir to remove mounts in all but the current mount namespace

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Message-ID: <20131008161135.GK14242@tucsk.piliscsaba.szeredi.hu>
Date:	Tue, 8 Oct 2013 18:11:35 +0200
From:	Miklos Szeredi <miklos@...redi.hu>
To:	Andy Lutomirski <luto@...capital.net>
Cc:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	"Serge E. Hallyn" <serge@...lyn.com>,
	Al Viro <viro@...iv.linux.org.uk>,
	Linux-Fsdevel <linux-fsdevel@...r.kernel.org>,
	Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Rob Landley <rob@...dley.net>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [RFC][PATCH 4/3] vfs: Allow rmdir to remove mounts in all but
 the current mount namespace

On Tue, Oct 08, 2013 at 09:06:29AM -0700, Andy Lutomirski wrote:

> > I think the risks of changing behavior outweigh the benefits.  How many
> > times did you have to remove or rename a mounted file or directory?  It's
> > very rarely needed.
> 
> I do this every time I reinstall a system while running that system.
> Admittedly, mount --move works, but that's a really unpleasant
> interface.
> 
> When rename2 gets added, there could be a flag RENAME_MOVE_MOUNT to opt in.

Good point.  Opting in would be the safest for both unlinkat() and
renameat2().

Thanks,
Miklos
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