nbd: add support for DISCARD

This patch series adds support for a DISCARD command in the nbd
protocol.  qemu-nbd will be the first user of the feature.

Please consider this for 3.2.

Thanks!

Cc: Paul Clements <Paul.Clements@steeleye.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

Paolo Bonzini (3):
  nbd: remove unused flags fields
  nbd: add support for feature negotiation
  nbd: map DISCARD requests to a new nbd request type

 drivers/block/nbd.c |   28 ++++++++++++++++++++--------
 include/linux/nbd.h |   32 ++++++++++++++++++--------------
 2 files changed, 38 insertions(+), 22 deletions(-)

-- 
1.7.6

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