From: Eric Sandeen <sandeen@redhat.com>
To: Vitez Gabor <vitezg@niif.hu>
Cc: linux-ext4@vger.kernel.org
Subject: Re: support freeze operation like xfs_freeze
Date: Thu, 25 Jan 2007 13:40:58 -0600 [thread overview]
Message-ID: <45B907CA.70309@redhat.com> (raw)
In-Reply-To: <20070125172818.GA25037@swszl.szkp.uni-miskolc.hu>
Vitez Gabor wrote:
> Hi,
>
> It would be really great if ext4 supported an xfs_freeze like operation.
> On xfs it spared me a lot of headaches when I was playing with unstable
> kernel features.
>
> thanks
> Gabor
>
Right now ext3 and ext4 -can- be frozen, but only via devicemapper,
because the call to freeze_bdev is only exposed via
<dm ioctl>
dev_suspend
do_suspend
dm_suspend
lock_fs
freeze_bdev <-- generic, exported kernel function
on an lvm volume. So, I think ext[34] are perfectly capable of being
frozen, there's just no generic userspace utility to point at a generic
block device to do that freezing. xfs's collection of ioctls to do this
directly got grandfathered in, I guess. :)
-Eric
next prev parent reply other threads:[~2007-01-25 19:41 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-01-25 17:28 support freeze operation like xfs_freeze Vitez Gabor
2007-01-25 17:59 ` coly
2007-01-25 19:40 ` Eric Sandeen [this message]
2007-01-26 21:22 ` Theodore Tso
2007-01-26 22:23 ` Eric Sandeen
2007-01-27 1:10 ` Theodore Tso
2007-01-29 9:57 ` Vitez Gabor
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