[Qemu-block] [PATCH 0/2] Optimize sparse reads over NBD

[Eric Blake]

When I first proposed the NBD extension of structured reads,
it was in order to more efficiently read sparse files without
sending lots of zeroes over the wire.  These two patches feel
like a feature addition, and missed soft freeze, so I'm
reluctant to include them in a 2.11 pull request; on the other
hand, implementing structured replies without sparse reads is
a rather incomplete feature addition even if it complies with
the NBD spec.  Since structured replies is a new 2.11 feature,
I could argue that it is a bug if the new feature does not go
all the way to sparse reads.

I've posted this as two patches, but welcome opinions on whether
it should be squashed into one.

Based-on: address@hidden
([PATCH 0/8] various NBD fixes for 2.11)

Eric Blake (2):
  nbd/server: Implement sparse reads atop structured reply
  nbd/server: Optimize final chunk of sparse read

 nbd/server.c     | 79 +++++++++++++++++++++++++++++++++++++++++++++++++++++---
 nbd/trace-events |  1 +
 2 files changed, 77 insertions(+), 3 deletions(-)

-- 
2.13.6