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qemu: Use proper agent entering function when freezing filesystems

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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.
(cherry picked from commit e0316b5ebd85ca7c20db9a3fe8f6062b4b5e051d)
This commit is contained in:
Peter Krempa 2012-10-01 17:58:29 +02:00 committed by Cole Robinson
parent 5c18805704
commit ccc7671135
1 changed files with 3 additions and 2 deletions
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5
src/qemu/qemu_driver.c
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@ -10390,6 +10390,7 @@ 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) {
@ -10408,9 +10409,9 @@ 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;
}