From: Christoph Hellwig <hch@lst.de>
To: Paolo Bonzini <pbonzini@redhat.com>
Cc: Mark Wu <wudx05@gmail.com>, qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] [RFC PATCH 0/3] block: add support for 4k logical blocks
Date: Fri, 25 Nov 2011 12:13:10 +0100 [thread overview]
Message-ID: <20111125111310.GA24566@lst.de> (raw)
In-Reply-To: <4ECF517F.5050000@redhat.com>
On Fri, Nov 25, 2011 at 09:27:43AM +0100, Paolo Bonzini wrote:
> No, it adds support for 512b logical block sizes running on a host with 4k
> logical block size and cache=none. This is suboptimal as it requires
> bounce buffers, but it can happen with migration and until libvirt provides
> a knob for the guest's logical block size.
It's also highly dangerous becausw the fs may assume a sector is written
atomically, but now it isn't. If at all I would recommend to only support
this case read only.
next prev parent reply other threads:[~2011-11-25 11:13 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-11-23 16:51 [Qemu-devel] [RFC PATCH 0/3] block: add support for 4k logical blocks Paolo Bonzini
2011-11-23 16:51 ` [Qemu-devel] [RFC PATCH 1/3] block: add bdrv_get_alignment, use it Paolo Bonzini
2011-11-23 16:51 ` [Qemu-devel] [RFC PATCH 2/3] raw: implement raw_get_alignment Paolo Bonzini
2011-11-23 16:51 ` [Qemu-devel] [RFC PATCH 3/3] block: do not rely on the buffer alignment passed to the guest Paolo Bonzini
2011-11-25 7:26 ` [Qemu-devel] [RFC PATCH 0/3] block: add support for 4k logical blocks Mark Wu
2011-11-25 8:27 ` Paolo Bonzini
2011-11-25 11:13 ` Christoph Hellwig [this message]
2011-11-28 3:05 ` Mark Wu
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