util: Replace virDomainDiskSourceIsBlockType with a new helper

For disks sources described by a libvirt volume we don't need to do a
complicated check since virStorageTranslateDiskSourcePool already
correctly determines the actual disk type.

Replace the checks using a new accessor that does not open-code the
whole logic.

src/libvirt_private.syms

@@ -2279,6 +2279,7 @@ virStorageSourceFree;
 virStorageSourceGetActualType;
 virStorageSourceGetSecurityLabelDef;
 virStorageSourceInitChainElement;
+virStorageSourceIsBlockLocal;
 virStorageSourceIsEmpty;
 virStorageSourceIsLocalStorage;
 virStorageSourceNewFromBacking;

src/lxc/lxc_cgroup.c

@@ -393,7 +393,8 @@ static int virLXCCgroupSetupDeviceACL(virDomainDefPtr def,
 
     VIR_DEBUG("Allowing any disk block devs");
     for (i = 0; i < def->ndisks; i++) {
-        if (!virDomainDiskSourceIsBlockType(def->disks[i]->src, false))
+        if (virStorageSourceIsEmpty(def->disks[i]->src) ||
+            !virStorageSourceIsBlockLocal(def->disks[i]->src))
             continue;
 
         if (virCgroupAllowDevicePath(cgroup,

src/qemu/qemu_conf.c

@@ -1243,7 +1243,9 @@ qemuAddSharedDisk(virQEMUDriverPtr driver,
     char *key = NULL;
     int ret = -1;
 
-    if (!disk->src->shared || !virDomainDiskSourceIsBlockType(disk->src, false))
+    if (virStorageSourceIsEmpty(disk->src) ||
+        !disk->src->shared ||
+        !virStorageSourceIsBlockLocal(disk->src))
         return 0;
 
     qemuDriverLock(driver);
@@ -1388,7 +1390,9 @@ qemuRemoveSharedDisk(virQEMUDriverPtr driver,
     char *key = NULL;
     int ret = -1;
 
-    if (!disk->src->shared || !virDomainDiskSourceIsBlockType(disk->src, false))
+    if (virStorageSourceIsEmpty(disk->src) ||
+        !disk->src->shared ||
+        !virStorageSourceIsBlockLocal(disk->src))
         return 0;
 
     qemuDriverLock(driver);
@@ -1476,7 +1480,7 @@ qemuSetUnprivSGIO(virDomainDeviceDefPtr dev)
         disk = dev->data.disk;
 
         if (disk->device != VIR_DOMAIN_DISK_DEVICE_LUN ||
-            !virDomainDiskSourceIsBlockType(disk->src, false))
+            !virStorageSourceIsBlockLocal(disk->src))
             return 0;
 
         path = virDomainDiskGetSource(disk);

src/util/virstoragefile.c

@@ -1955,7 +1955,7 @@ virStorageSourcePoolDefFree(virStorageSourcePoolDefPtr def)
 
 
 int
-virStorageSourceGetActualType(virStorageSourcePtr def)
+virStorageSourceGetActualType(const virStorageSource *def)
 {
     if (def->type == VIR_STORAGE_TYPE_VOLUME && def->srcpool)
         return def->srcpool->actualtype;
@@ -2011,6 +2011,20 @@ virStorageSourceIsEmpty(virStorageSourcePtr src)
 }
 
 
+/**
+ * virStorageSourceIsBlockLocal:
+ * @src: disk source definition
+ *
+ * Returns true if @src describes a locally accessible block storage source.
+ * This includes block devices and host-mapped iSCSI volumes.
+ */
+bool
+virStorageSourceIsBlockLocal(const virStorageSource *src)
+{
+    return virStorageSourceGetActualType(src) == VIR_STORAGE_TYPE_BLOCK;
+}
+
+
 /**
  * virStorageSourceBackingStoreClear:
  *

src/util/virstoragefile.h

@@ -357,9 +357,10 @@ int virStorageSourceInitChainElement(virStorageSourcePtr newelem,
                                      bool force);
 void virStorageSourcePoolDefFree(virStorageSourcePoolDefPtr def);
 void virStorageSourceClear(virStorageSourcePtr def);
-int virStorageSourceGetActualType(virStorageSourcePtr def);
+int virStorageSourceGetActualType(const virStorageSource *def);
 bool virStorageSourceIsLocalStorage(virStorageSourcePtr src);
 bool virStorageSourceIsEmpty(virStorageSourcePtr src);
+bool virStorageSourceIsBlockLocal(const virStorageSource *src);
 void virStorageSourceFree(virStorageSourcePtr def);
 void virStorageSourceBackingStoreClear(virStorageSourcePtr def);
 int virStorageSourceUpdateBlockPhysicalSize(virStorageSourcePtr src,