When an esnap clone blob's external snapshot arrives after the blob is
opened, it can now be hot-added to the blob. Presumably the new device
replaces a place-holder device that did not really atteempt IO.
Change-Id: I622feb84efa66628debf44f7e7cb88b6a012db6d
Signed-off-by: Mike Gerdts <mgerdts@nvidia.com>
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/16232
Community-CI: Mellanox Build Bot
Reviewed-by: Ben Walker <benjamin.walker@intel.com>
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>
aaebaece6d