From: "H. Peter Anvin" <hpa@zytor.com>
To: Jan Engelhardt <jengelh@computergmbh.de>
Cc: Al Viro <viro@ftp.linux.org.uk>,
Mark Cannon <random.bits@rogers.com>,
linux-kernel@vger.kernel.org
Subject: Re: Use of directories to hold root?
Date: Sun, 12 Aug 2007 13:57:53 -0700 [thread overview]
Message-ID: <46BF7451.2020306@zytor.com> (raw)
In-Reply-To: <Pine.LNX.4.64.0708122253360.28963@fbirervta.pbzchgretzou.qr>
Jan Engelhardt wrote:
> On Aug 12 2007 21:23, Al Viro wrote:
>>> pivot_root is atomic afaict, for `mount --move` (which I think Al meant
>>> which MS_MOVE - or some C program using mount(2) of your own), you'd
>>> need multiple calls to mount.
>> Move itself is done by a single syscall anyway...
>>
> Yes, but you need needed 2 mounts, 1 chdir and one chroot. Plus, you
> have not freed the data in the rootfs. (Well, neither does
> pivot_root, but run-init from klibc will.)
Yes, which is why it is highly inappropriate for this particular case,
since they have multiple roots that they presumably don't want deleted!
-hpa
prev parent reply other threads:[~2007-08-12 21:02 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-08-10 21:24 Use of directories to hold root? Mark Cannon
2007-08-10 21:33 ` Jan Engelhardt
2007-08-11 0:08 ` H. Peter Anvin
2007-08-11 15:55 ` Jan Engelhardt
2007-08-11 16:07 ` Al Viro
2007-08-12 19:39 ` Mark Cannon
2007-08-12 19:49 ` Jan Engelhardt
2007-08-12 20:23 ` Al Viro
2007-08-12 20:55 ` Jan Engelhardt
2007-08-12 20:57 ` H. Peter Anvin [this message]
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