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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, mtk manpages googlemail com, Eric Sandeen <sandeen sandeen net>, linux-kernel vger kernel org, xfs oss sgi com, Christoph Hellwig <hch infradead org>, dm-devel redhat com, viro ZenIV linux org uk, linux-fsdevel vger kernel org, Andrew Morton <akpm linux-foundation org>, linux-ext4 vger kernel org, Ric Wheeler <rwheeler redhat com>, Oleg Nesterov <oleg tv-sign ru>
- Subject: [dm-devel] Re: [PATCH 3/3] Add timeout feature
- Date: Thu, 9 Oct 2008 06:18:09 -0400
On Thu, Oct 09, 2008 at 07:12:17PM +0900, Takashi Sato wrote:
> I think we need the timeout for the case someone dirties so much data
> with mmap, hence the freeze process is swapped out and cannot unfreeze.
That is not supposed to happen. That's why write blocks early on a
frozen filesystem (the shared mmap write path is currently missing the
check, but that's a rather small patch)
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