conf: domain: Add helper to check whether a domain def requires use of PR

Extract the lookup code so that it can be reused later.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>

src/conf/domain_conf.c

@@ -29579,3 +29579,24 @@ virDomainDiskGetDetectZeroesMode(virDomainDiskDiscard discard,
 
     return detect_zeroes;
 }
+
+
+/**
+ * virDomainDefHasManagedPR:
+ * @def: domain definition
+ *
+ * Returns true if any of the domain disks requires the use of the managed
+ * persistent reservations infrastructure.
+ */
+bool
+virDomainDefHasManagedPR(const virDomainDef *def)
+{
+    size_t i;
+
+    for (i = 0; i < def->ndisks; i++) {
+        if (virStoragePRDefIsManaged(def->disks[i]->src->pr))
+            return true;
+    }
+
+    return false;
+}

src/conf/domain_conf.h

@@ -3544,4 +3544,7 @@ int
 virDomainDiskGetDetectZeroesMode(virDomainDiskDiscard discard,
                                  virDomainDiskDetectZeroes detect_zeroes);
 
+bool
+virDomainDefHasManagedPR(const virDomainDef *def);
+
 #endif /* __DOMAIN_CONF_H */

src/libvirt_private.syms

@@ -275,6 +275,7 @@ virDomainDefGetVcpus;
 virDomainDefGetVcpusMax;
 virDomainDefGetVcpusTopology;
 virDomainDefHasDeviceAddress;
+virDomainDefHasManagedPR;
 virDomainDefHasMemballoon;
 virDomainDefHasMemoryHotplug;
 virDomainDefHasUSB;

src/qemu/qemu_process.c

@@ -2748,26 +2748,6 @@ qemuProcessStartManagedPRDaemon(virDomainObjPtr vm)
 }
 
 
-static int
-qemuProcessMaybeStartManagedPRDaemon(virDomainObjPtr vm)
-{
-    bool hasManaged = false;
-    size_t i;
-
-    for (i = 0; i < vm->def->ndisks; i++) {
-        if (virStoragePRDefIsManaged(vm->def->disks[i]->src->pr)) {
-            hasManaged = true;
-            break;
-        }
-    }
-
-    if (!hasManaged)
-        return 0;
-
-    return qemuProcessStartManagedPRDaemon(vm);
-}
-
-
 static int
 qemuProcessInitPasswords(virQEMUDriverPtr driver,
                          virDomainObjPtr vm,
@@ -6285,7 +6265,8 @@ qemuProcessLaunch(virConnectPtr conn,
         goto cleanup;
 
     VIR_DEBUG("Setting up managed PR daemon");
-    if (qemuProcessMaybeStartManagedPRDaemon(vm) < 0)
+    if (virDomainDefHasManagedPR(vm->def) &&
+        qemuProcessStartManagedPRDaemon(vm) < 0)
         goto cleanup;
 
     VIR_DEBUG("Setting domain security labels");