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 <ebl...@redhat.com> > --- > 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 <stefa...@redhat.com>
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