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Re: [Qemu-devel] [RFC] Block device size rounding
From: |
Eric Blake |
Subject: |
Re: [Qemu-devel] [RFC] Block device size rounding |
Date: |
Mon, 12 Oct 2015 10:26:14 -0600 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.3.0 |
On 10/12/2015 09:56 AM, John Snow wrote:
>> What is the correct action here though? If the file is writeable should
>> we just allow the device to extend its size? Is that possible already?
>> Just zero-pad read-only?
>>
>
> Read-only seems like an easy case of append zeroes.
Yes, allowing read-only with append-zero behavior seems sane.
>
> Read-write ... well, we can't write-protect just half of a 512k block.
> Probably just forcibly increasing the size on RW or refusing to use the
> file altogether are probably the sane deterministic things we want.
I'd lean towards outright rejection if the file size isn't up to snuff
for use as read-write. Forcibly increasing the size (done
unconditionally) still feels like magic, and may not be possible if the
size is due to something backed by a block device rather than a file.
--
Eric Blake eblake redhat com +1-919-301-3266
Libvirt virtualization library http://libvirt.org
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- [Qemu-devel] [RFC] Block device size rounding, Peter Crosthwaite, 2015/10/09
- Re: [Qemu-devel] [RFC] Block device size rounding, John Snow, 2015/10/12
- Re: [Qemu-devel] [RFC] Block device size rounding,
Eric Blake <=
- Re: [Qemu-devel] [RFC] Block device size rounding, Peter Crosthwaite, 2015/10/15
- Re: [Qemu-devel] [RFC] Block device size rounding, John Snow, 2015/10/12
- Re: [Qemu-devel] [RFC] Block device size rounding, Markus Armbruster, 2015/10/13
- Re: [Qemu-devel] [RFC] Block device size rounding, Kevin Wolf, 2015/10/15
- Re: [Qemu-devel] [RFC] Block device size rounding, Peter Crosthwaite, 2015/10/13
- Re: [Qemu-devel] [RFC] Block device size rounding, John Snow, 2015/10/15
- Re: [Qemu-devel] [RFC] Block device size rounding, Kevin Wolf, 2015/10/14
- Re: [Qemu-devel] [RFC] Block device size rounding, John Snow, 2015/10/16
- Re: [Qemu-devel] [RFC] Block device size rounding, Peter Crosthwaite, 2015/10/16