Re: [Qemu-devel] [PATCH v2 08/17] block: add flag to indicate that no I/O will be performed

[Eric Blake <eblake@redhat.com>]

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On 01/20/2016 10:38 AM, Daniel P. Berrange wrote:
> When opening an image it is useful to know whether the caller
> intends to perform I/O on the image or not. In the case of
> encrypted images this will allow the block driver to avoid
> having to prompt for decryption keys when we merely want to
> query header metadata about the image. eg qemu-img info
> 
> This flag is enforced at the top level only, since even if
> we don't want todo I/O on the 'qcow2' file payload, the
> underlying 'file' driver will still need todo I/O to read
> the qcow2 header, for example.

s/todo/to do/2

> 
> Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
> ---
>  block.c               |  5 +++--
>  block/io.c            |  2 ++
>  include/block/block.h |  1 +
>  qemu-img.c            | 33 +++++++++++++++++----------------
>  4 files changed, 23 insertions(+), 18 deletions(-)
> 

Reviewed-by: Eric Blake <eblake@redhat.com>

-- 
Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org


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