From: Christoph Hellwig <hch@lst.de>
To: Juan Quintela <quintela@redhat.com>
Cc: qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] [PATCH 5/5] drive_open: Add invalidate option for block devices
Date: Fri, 7 Jan 2011 09:38:55 +0100 [thread overview]
Message-ID: <20110107083855.GA15053@lst.de> (raw)
In-Reply-To: <95fe2a778152f50d942dcb17872927247195d0b1.1294150511.git.quintela@redhat.com>
On Tue, Jan 04, 2011 at 03:33:30PM +0100, Juan Quintela wrote:
> Linux allows to invalidate block devices. This is needed for the incoming
> migration part.
It's not. The only thing that makes migration on block devices safe is
using O_DIRECT, aka cache=none.
next prev parent reply other threads:[~2011-01-07 8:39 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-01-04 14:33 [Qemu-devel] [PATCH 0/5] Fix migration with NFS & iscsi/Fiber channel Juan Quintela
2011-01-04 14:33 ` [Qemu-devel] [PATCH 1/5] migration: exit with error code Juan Quintela
2011-01-04 14:33 ` [Qemu-devel] [PATCH 2/5] blockdev: don't leak id on removal Juan Quintela
2011-01-04 14:33 ` [Qemu-devel] [PATCH 3/5] blockdev: release resources in the error case Juan Quintela
2011-01-04 14:33 ` [Qemu-devel] [PATCH 4/5] Reopen files after migration Juan Quintela
2011-01-04 19:05 ` Blue Swirl
2011-01-05 15:52 ` Markus Armbruster
2011-01-04 14:33 ` [Qemu-devel] [PATCH 5/5] drive_open: Add invalidate option for block devices Juan Quintela
2011-01-04 19:06 ` Blue Swirl
2011-01-04 19:23 ` [Qemu-devel] " Juan Quintela
2011-01-07 8:38 ` Christoph Hellwig [this message]
2011-01-10 10:15 ` [Qemu-devel] Re: [PATCH 0/5] Fix migration with NFS & iscsi/Fiber channel Juan Quintela
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