18.04.2018 19:37, Eric Blake wrote:
On 04/13/2018 09:31 AM, Vladimir Sementsov-Ogievskiy wrote:
Handle nbd CACHE command. Just do read, without sending read data back.
Cache mechanism should be done by exported node driver chain.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsement...@virtuozzo.com>
---
  include/block/nbd.h |  3 ++-
  nbd/server.c        | 10 ++++++----
  2 files changed, 8 insertions(+), 5 deletions(-)

diff --git a/include/block/nbd.h b/include/block/nbd.h
index fcdcd54502..b4793d0a29 100644
--- a/include/block/nbd.h
+++ b/include/block/nbd.h
@@ -135,6 +135,7 @@ typedef struct NBDExtent {
  #define NBD_FLAG_SEND_TRIM         (1 << 5) /* Send TRIM (discard) */
  #define NBD_FLAG_SEND_WRITE_ZEROES (1 << 6) /* Send WRITE_ZEROES */
  #define NBD_FLAG_SEND_DF           (1 << 7) /* Send DF (Do not Fragment) */
+#define NBD_FLAG_SEND_CACHE        (1 << 8) /* Send CACHE (prefetch) */
Hmm, this flag is not documented in the upstream NBD protocol yet; are
we sure it matches the xNBD implementation?  We'll want at least a
documentation patch proposed for the NBD list before taking this.


The discussion already on list:
https://lists.debian.org/nbd/2018/03/msg00040.html

--
Best regards,
Vladimir


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