[libvirt] [PATCH 2/2] qemu: blockjob: Refuse to register blockjob if disk already has one

[Peter Krempa]

Most code paths prevent starting a blockjob if we already have one but
the job registering function does not do this check. While this isn't a
problem for regular cases we had a bad test case where we registered two
jobs for a single disk which leaked one of the jobs. Prevent this in the
registering function until we allow having multiple jobs per disk.

Signed-off-by: Peter Krempa <pkrempa at redhat.com>
---
 src/qemu/qemu_blockjob.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/qemu/qemu_blockjob.c b/src/qemu/qemu_blockjob.c
index a991309ee7..80d0269128 100644
--- a/src/qemu/qemu_blockjob.c
+++ b/src/qemu/qemu_blockjob.c
@@ -143,6 +143,12 @@ qemuBlockJobRegister(qemuBlockJobDataPtr job,
 {
     qemuDomainObjPrivatePtr priv = vm->privateData;

+    if (disk && QEMU_DOMAIN_DISK_PRIVATE(disk)->blockjob) {
+        virReportError(VIR_ERR_INTERNAL_ERROR,
+                       _("disk '%s' has a blockjob assigned"), disk->dst);
+        return -1;
+    }
+
     if (virHashAddEntry(priv->blockjobs, job->name, virObjectRef(job)) < 0) {
         virObjectUnref(job);
         return -1;
-- 
2.21.0