Re: [Qemu-devel] [PATCH] doc: Propose NBD_FLAG_INIT_ZEROES extension

[Stefan Hajnoczi]

On Mon, Dec 05, 2016 at 05:42:35PM -0600, Eric Blake wrote:
> While not directly related to NBD_CMD_WRITE_ZEROES, the qemu
> team discovered that it is useful if a server can advertise
> whether an export is in a known-all-zeroes state at the time
> the client connects.
> 
> Signed-off-by: Eric Blake <address@hidden>
> ---
>  doc/proto.md | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> This replaces the following qemu patch attempt:
> https://lists.gnu.org/archive/html/qemu-devel/2016-12/msg00357.html
> which tried to add NBD_CMD_HAS_ZERO_INIT with poor semantics. The
> semantics in this proposal should be much better.
> 
> Patch is to the merge of the master branch and the
> extension-write-zeroes branch.  By the way, qemu 2.8 is due
> to be released "real soon now", and implements NBD_CMD_WRITE_ZEROES,
> so maybe it is time to consider promoting the extension-write-zeroes
> branch into master.

Useful, thanks!

Reviewed-by: Stefan Hajnoczi <address@hidden>

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