Previous nbd implementation only processes one I/O at a time.
This patch increases spdk_nbd_disk io queue-depth.
lists are added to accommodate and coordinate overplapped nbd_io.
Change-Id: I3bda2c957a561b884ebfe9550b7cb6f3c991aef8
Signed-off-by: Xiaodong Liu <xiaodong.liu@intel.com>
Reviewed-on: https://review.gerrithub.io/392609
Tested-by: SPDK Automated Test System <sys_sgsw@intel.com>
Reviewed-by: Changpeng Liu <changpeng.liu@intel.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>