[Libguestfs] [nbdkit PATCH] protocol: Trivially implement NBD_CMD_FLAG_DF

[Eric Blake]

On 4/1/19 10:09 AM, Martin Kletzander wrote:

>>> +++ b/TODO
>>> @@ -24,8 +24,8 @@ General ideas for improvements
>>>    to inform nbdkit when the response is ready:
>>>    https://www.redhat.com/archives/libguestfs/2018-January/msg00149.html
>>>
>>> -* More NBD protocol features.  The only currently missing feature is
>>> -  online resize.
>>> +* More NBD protocol features.  The only currently missing features are
>>> +  sparse reads and online resize.
>>>
> 
> This resets the change from commit 26455d452574, probably unintentionally?

The earlier commit had:

-* More NBD protocol features. In the upstream pipeline: proposals for
-  block status and online resize.
+* More NBD protocol features.  The only currently missing feature is
+  online resize.

We implemented block status (which can indirectly be used to avoid the
need for sparse reads, for the same effect), but we did not actually
implement sparse reads (where we send FAR less network traffic for
blocks that are known to read as zeroes). So my change in wording was
intentional.

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

-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 488 bytes
Desc: OpenPGP digital signature
URL: <http://listman.redhat.com/archives/libguestfs/attachments/20190401/a5aff8f8/attachment.sig>