Merge pull request ceph#62009 from Jayaprakash-ibm/wip-bdev-skip-aio-zero-size

blk/kernel : skip AIO thread for zero-sized devices

Author: aclamk

src/blk/kernel/KernelDevice.cc

@@ -295,9 +295,13 @@ int KernelDevice::open(const string& p)
     goto out_fail;
   }
 
-  r = _aio_start();
-  if (r < 0) {
-    goto out_fail;
+  if (size > 0) {
+    r = _aio_start();
+    if (r < 0) {
+      goto out_fail;
+    }
+  } else {
+    aio = false;
   }
 
   _discard_update_threads();