Re: [Qemu-block] [Qemu-devel] [PATCH 1/3] hw/block: Introduce rotational qdev property

[Eric Blake]

On 05/06/2017 07:43 AM, Aurelien Jarno wrote:
> The Linux kernel uses different I/O scheduler depending if the block
> device is a rotational device or not. Also it uses rotational devices
> to add entropy to the random pool.
> 
> This patch add a rotational qdev property so that the block device can
> be configured as a rotational device or a non-rotational device. Default
> to true to not change the default behavior.
> 
> Signed-off-by: Aurelien Jarno <address@hidden>
> ---
>  blockdev.c               | 4 ++++
>  include/hw/block/block.h | 4 +++-
>  2 files changed, 7 insertions(+), 1 deletion(-)

Please remember to send a 0/3 cover letter when sending a series (you
can use 'git config format.coverletter auto' to make it easier).

The NBD server has the ability to expose to a client whether a given
exported volume is rotational or not; so there may be some additional
integration you should perform to make nbd-server properly export this
new property.

-- 
Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3266
Virtualization:  qemu.org | libvirt.org

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