From: Christoph Hellwig <hch@lst.de>
To: Stefan Hajnoczi <stefanha@gmail.com>
Cc: Kevin Wolf <kwolf@redhat.com>,
Anthony Liguori <aliguori@us.ibm.com>,
Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>,
qemu-devel <qemu-devel@nongnu.org>,
Ananth Narayan <ananth@linux.vnet.ibm.com>,
Prerna Saxena <prerna@linux.vnet.ibm.com>,
Christoph Hellwig <hch@lst.de>
Subject: Re: [Qemu-devel] [RFC][PATCH 0/2] Allow cache settings for block devices to be changed at runtime.
Date: Tue, 1 Mar 2011 13:42:54 +0100 [thread overview]
Message-ID: <20110301124254.GA29485@lst.de> (raw)
In-Reply-To: <AANLkTim2iv4zAhLsC5XzhOX9o3bMVQ866O3z-ZAWG7r4@mail.gmail.com>
The only way to change the cache settings is from the guest. Without
that we're guranteed to lose data when going from WCE=0 to WCE=1.
I have patches to do that, and to allow changing O_DIRECT via a monitor
command, but to toggle O_SYNC via fcntl I first need to get a kernel
patch in as that's currently not allowed to be changed at runtime.
next prev parent reply other threads:[~2011-03-01 12:43 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-02-28 11:49 [Qemu-devel] [RFC][PATCH 0/2] Allow cache settings for block devices to be changed at runtime Prerna Saxena
2011-02-28 12:07 ` [Qemu-devel] [RFC][PATCH 1/2] Add monitor command 'set-cache' to change cache settings for a block device Prerna Saxena
2011-02-28 12:11 ` [Qemu-devel] [RFC][PATCH 2/2] Extend monitor command 'info block' to display cache settings for block devices Prerna Saxena
2011-02-28 15:15 ` Kevin Wolf
2011-02-28 15:12 ` [Qemu-devel] [RFC][PATCH 0/2] Allow cache settings for block devices to be changed at runtime Kevin Wolf
2011-02-28 15:35 ` Stefan Hajnoczi
2011-02-28 15:48 ` Kevin Wolf
2011-03-01 9:55 ` Stefan Hajnoczi
2011-03-01 10:06 ` Kevin Wolf
2011-03-01 15:02 ` Chunqiang Tang
2011-03-01 13:03 ` Anthony Liguori
2011-03-01 13:22 ` Kevin Wolf
2011-03-01 15:47 ` Anthony Liguori
2011-03-01 12:42 ` Christoph Hellwig [this message]
2011-03-01 12:48 ` Stefan Hajnoczi
2011-03-01 12:50 ` Christoph Hellwig
2011-03-01 19:13 ` Anthony Liguori
2011-03-02 7:57 ` Kevin Wolf
2011-03-01 12:52 ` Kevin Wolf
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