Re: [Qemu-devel] [PATCH 0/3] block: blk_co_pcache

[Eric Blake]

On 6/6/19 8:48 AM, Vladimir Sementsov-Ogievskiy wrote:
> Hi all!
> 
> Here is small new io API: blk_co_pcache, which does copy-on-read without
> extra buffer for read data. This means that only parts that needs COR
> will be actually read and only corresponding buffers allocated, no more.
> 
> This allows to improve a bit block-stream and NBD_CMD_CACHE

I'd really like to see qemu-io gain access to calling this command, so
that we can add iotests coverage of this new feature. Note that the
in-development libnbd
(https://github.com/libguestfs/libnbd/commits/master) is also usable as
an NBD client that can drive NBD_CMD_CACHE, although it's still new
enough that we probably don't want to rely on it being available yet.

-- 
Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3226
Virtualization:  qemu.org | libvirt.org

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