[for-6.2,0/2] NBD 6.2-rc fixes

Message

Eric Blake Nov. 17, 2021, 5:02 p.m. UTC

Back in September, Rich proposed a patch to silence an EPIPE message
from qemu-nbd when used with Unix sockets:
https://lists.gnu.org/archive/html/qemu-devel/2021-09/msg03359.html

But investigating that further, I found that we had a different
message with TCP sockets, and that we regressed in qemu 6.0 with
regards to the message we print due to the use of uninitialized
memory.  Fixing the uninitialized memory use happens to also silence
the message that Rich was seeing, but without needing to special-case
EPIPE.

I also noticed that even though commit 2800637a and friends made the
block layer support 64-bit zero/trim, we are still manually splitting
3G requests in the NBD driver.  Patch 2 fixes that, although I'm less
certain whether it counts as 6.2-rc material since it is merely a
minor performance tweak to a feature new to 6.2, rather than a
regression fix.

Eric Blake (2):
  nbd/server: Don't complain on certain client disconnects
  nbd/server: Simplify zero and trim

 nbd/server.c | 30 ++++++++----------------------
 1 file changed, 8 insertions(+), 22 deletions(-)