From: Eric Blake <eblake@redhat.com>
Date: Wed, 20 Feb 2013 22:34:48 +0000 (-0700)
Subject: qemu: check backing chains even when cgroup is omitted
X-Git-Tag: v1.0.3-rc1~53
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=82d5fe543720da6d83c1d6bfa1c347d7d9fda278;p=thirdparty%2Flibvirt.git

qemu: check backing chains even when cgroup is omitted

https://bugzilla.redhat.com/show_bug.cgi?id=896685 points out
a regression caused by commit 38c4a9c - libvirt only labels
the backing chain if the backing chain cache is populated, but
the code to populate the cache was only conditionally performed
if cgroup labeling was necessary.

* src/qemu/qemu_cgroup.c (qemuSetupCgroup): Hoist cache setup...
* src/qemu/qemu_process.c (qemuProcessStart): ...earlier into
caller, where it is now unconditional.
---

diff --git a/src/qemu/qemu_cgroup.c b/src/qemu/qemu_cgroup.c
index 4fde1aff51..e65b486212 100644
--- a/src/qemu/qemu_cgroup.c
+++ b/src/qemu/qemu_cgroup.c
@@ -234,9 +234,7 @@ int qemuSetupCgroup(virQEMUDriverPtr driver,
         }
 
         for (i = 0; i < vm->def->ndisks ; i++) {
-            if (qemuDomainDetermineDiskChain(driver, vm->def->disks[i],
-                                             false) < 0 ||
-                qemuSetupDiskCgroup(vm, cgroup, vm->def->disks[i]) < 0)
+            if (qemuSetupDiskCgroup(vm, cgroup, vm->def->disks[i]) < 0)
                 goto cleanup;
         }
 
diff --git a/src/qemu/qemu_process.c b/src/qemu/qemu_process.c
index aade682689..b560d2ea5c 100644
--- a/src/qemu/qemu_process.c
+++ b/src/qemu/qemu_process.c
@@ -3706,6 +3706,11 @@ int qemuProcessStart(virConnectPtr conn,
         goto cleanup;
 
     VIR_DEBUG("Checking for CDROM and floppy presence");
+    for (i = 0; i < vm->def->ndisks ; i++) {
+        if (qemuDomainDetermineDiskChain(driver, vm->def->disks[i],
+                                         false) < 0)
+            goto cleanup;
+    }
     if (qemuDomainCheckDiskPresence(driver, vm,
                                     flags & VIR_QEMU_PROCESS_START_COLD) < 0)
         goto cleanup;