[libvirt] [PATCH] qemu: Use proper agent entering function when freezing filesystems

[Peter Krempa]

When doing snapshots, the filesystem freeze function used the agent
entering function that expects the qemud_driver unlocked. This might
cause a deadlock of the qemu driver if the agent does not respond.

The only call path of this function has the qemud_driver locked, so this
patch changes the entering functions to those expecting the driver
locked.
---
 src/qemu/qemu_driver.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
index b0a0bb5..50f44ce 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -10375,6 +10375,7 @@ qemuDomainSnapshotIsAllowed(virDomainObjPtr vm)
     return true;
 }

+/* this function expects the driver lock to be held by the caller */
 static int
 qemuDomainSnapshotFSFreeze(struct qemud_driver *driver,
                            virDomainObjPtr vm) {
@@ -10393,9 +10394,9 @@ qemuDomainSnapshotFSFreeze(struct qemud_driver *driver,
         return -1;
     }

-    qemuDomainObjEnterAgent(driver, vm);
+    qemuDomainObjEnterAgentWithDriver(driver, vm);
     freezed = qemuAgentFSFreeze(priv->agent);
-    qemuDomainObjExitAgent(driver, vm);
+    qemuDomainObjExitAgentWithDriver(driver, vm);

     return freezed;
 }
-- 
1.7.12