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[dm-devel] Re: [PATCH 3/3] Add timeout feature
- From: Christoph Hellwig <hch infradead org>
- To: Takashi Sato <t-sato yk jp nec com>
- Cc: "axboe kernel dk" <axboe kernel dk>, "mtk manpages googlemail com" <mtk manpages googlemail com>, "linux-kernel vger kernel org" <linux-kernel vger kernel org>, "xfs oss sgi com" <xfs oss sgi com>, Christoph Hellwig <hch infradead org>, "dm-devel redhat com" <dm-devel redhat com>, "viro ZenIV linux org uk" <viro ZenIV linux org uk>, "linux-fsdevel vger kernel org" <linux-fsdevel vger kernel org>, Andrew Morton <akpm linux-foundation org>, "linux-ext4 vger kernel org" <linux-ext4 vger kernel org>, Oleg Nesterov <oleg tv-sign ru>
- Subject: [dm-devel] Re: [PATCH 3/3] Add timeout feature
- Date: Mon, 8 Sep 2008 13:11:19 -0400
On Mon, Sep 08, 2008 at 08:53:37PM +0900, Takashi Sato wrote:
> The timeout feature is added to "freeze ioctl" to solve a deadlock
> when the freezer accesses a frozen filesystem. And new ioctl
> to reset the timeout period is added to extend the timeout period.
> For example, the freezer resets the timeout period to 10 seconds every 5
> seconds. In this approach, even if the freezer causes a deadlock by
> accessing the frozen filesystem, it will be solved by the timeout
> in 10 seconds and the freezer will be able to recognize that
> at the next reset of timeout period.
And as with all previous posting I still fundamentally disagree about
the need of this functionality. We don't need a timeout for freezing.
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