This can speed up the check for whether a blob is already open significantly. Signed-off-by: Ben Walker <benjamin.walker@intel.com> Change-Id: If32b0b1f168fcdb58e61df6281d7b7520725a195 Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/2781 Tested-by: SPDK CI Jenkins <sys_sgci@intel.com> Community-CI: Mellanox Build Bot Reviewed-by: Jim Harris <james.r.harris@intel.com> Reviewed-by: Shuhei Matsumoto <shuhei.matsumoto.xt@hitachi.com> Reviewed-by: Paul Luse <paul.e.luse@intel.com>