os/bluestore/BlockDevice: helpful error when aio cannot init

Signed-off-by: Sage Weil <sage@redhat.com>

diff --git a/src/os/bluestore/BlockDevice.cc b/src/os/bluestore/BlockDevice.cc
index 9af3bec3c34a55ddb541bda0c9a2ef41a5c107f9..3afc4d7c22247f8c544f4e4860ac382e222a65ae 100644 (file)
--- a/src/os/bluestore/BlockDevice.cc
+++ b/src/os/bluestore/BlockDevice.cc
@@ -183,8 +183,10 @@ int BlockDevice::_aio_start()
   if (g_conf->bdev_aio) {
     dout(10) << __func__ << dendl;
     int r = aio_queue.init();
-    if (r < 0)
+    if (r < 0) {
+      derr << __func__ << " failed: " << cpp_strerror(r) << dendl;
       return r;
+    }
     aio_thread.create();
   }
   return 0;