From: Sage Weil <sage@redhat.com>
Date: Tue, 4 Oct 2016 19:24:31 +0000 (-0400)
Subject: os/bluestore/KernelDevice: fix aio_submit race
X-Git-Tag: v11.1.0~714^2~1
X-Git-Url: http://git-server-git.apps.pok.os.sepia.ceph.com/?a=commitdiff_plain;h=3ed80d975f41d25f26406dde269aefa76ba9d2fa;p=ceph.git

os/bluestore/KernelDevice: fix aio_submit race

Behave if pending is empty.

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

diff --git a/src/os/bluestore/KernelDevice.cc b/src/os/bluestore/KernelDevice.cc
index 7c6a6eac186a..a24b8b751e99 100644
--- a/src/os/bluestore/KernelDevice.cc
+++ b/src/os/bluestore/KernelDevice.cc
@@ -329,6 +329,9 @@ void KernelDevice::aio_submit(IOContext *ioc)
 	   << " pending " << ioc->num_pending.load()
 	   << " running " << ioc->num_running.load()
 	   << dendl;
+  if (ioc->num_pending.load() == 0) {
+    return;
+  }
   // move these aside, and get our end iterator position now, as the
   // aios might complete as soon as they are submitted and queue more
   // wal aio's.