linux-ext4 - Re: [PATCH 3/3] Add timeout feature

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Message-Id: <88E7CDF01964465CB9F33DE11298271D@nsl.ad.nec.co.jp>
Date:	Mon, 14 Jul 2008 22:12:51 +0900
From:	"Takashi Sato" <t-sato@...jp.nec.com>
To:	"jim owens" <jowens@...com>
Cc:	<mtk.manpages@...glemail.com>, <axboe@...nel.dk>,
	<linux-kernel@...r.kernel.org>, <dm-devel@...hat.com>,
	<xfs@....sgi.com>, <linux-ext4@...r.kernel.org>,
	<viro@...IV.linux.org.uk>, <akpm@...ux-foundation.org>,
	<pavel@...e.cz>, <linux-fsdevel@...r.kernel.org>,
	<hch@...radead.org>, "Miklos Szeredi" <miklos@...redi.hu>,
	"Arjan van de Ven" <arjan@...radead.org>,
	"Theodore Tso" <tytso@....edu>,
	"Dave Chinner" <david@...morbit.com>
Subject: Re: [PATCH 3/3] Add timeout feature

Hi,

jim owens wrote:
> In addition to the user controllable timeout mechanism,
> we internally implement AUTO-THAW in the filesystem
> whenever necessary to prevent a kernel hang/crash.
>
> If an AUTO-THAW occurs, we post to the log and an
> event manager so the user knows the snapshot is bad.

I am interested in AUTO-THAW.
What is the difference between the timeout and AUTO-THAW?
When the kernel detects a deadlock, does it occur to solve it?

Cheers, Takashi
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