linux-kernel - Re: [PATCH 26/30] ext4: do not send discards as barriers

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Message-ID: <4C7CB936.8010509@kernel.org>
Date:	Tue, 31 Aug 2010 10:11:34 +0200
From:	Tejun Heo <tj@...nel.org>
To:	Jan Kara <jack@...e.cz>
CC:	Jeff Moyer <jmoyer@...hat.com>, Christoph Hellwig <hch@....de>,
	jaxboe@...ionio.com, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, linux-scsi@...r.kernel.org,
	linux-ide@...r.kernel.org, linux-raid@...r.kernel.org,
	James.Bottomley@...e.de, tytso@....edu, chris.mason@...cle.com,
	swhiteho@...hat.com, konishi.ryusuke@....ntt.co.jp,
	dm-devel@...hat.com, vst@...b.net, rwheeler@...hat.com,
	hare@...e.de, neilb@...e.de, rusty@...tcorp.com.au, mst@...hat.com,
	jeremy@...p.org, snitzer@...hat.com, k-ueda@...jp.nec.com,
	Christoph Hellwig <hch@...radead.org>
Subject: Re: [PATCH 26/30] ext4: do not send discards as barriers

On 08/30/2010 10:20 PM, Jan Kara wrote:
>   My setup is that I have a dedicated partition / drive for a filesystem
> which is written to from a guest kernel running under KVM. I have set it up
> using virtio driver with cache=writeback so that the host caches the writes
> in a similar way disk caches them. At some point I just kill the qemu-kvm
> process and at that point I'd like to also throw away data cached by the
> host...

$ echo 1 > /sys/block/sdX/device/delete
$ echo - - - > /sys/class/scsi_host/hostX/scan

should do the trick.

Thanks.

-- 
tejun
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