qemu: Use virDomainSnapshotState for switch statements

Clean up the previous patch which abused switch on virDomainState
while working with a variable containing virDomainSnapshotState, by
converting the two affected switch statements to now use the right
enum.
Signed-off-by: NEric Blake <eblake@redhat.com>
Reviewed-by: NJohn Ferlan <jferlan@redhat.com>

src/qemu/qemu_driver.c

@@ -15681,7 +15681,7 @@ qemuDomainSnapshotCreateXML(virDomainPtr domain,
     virQEMUDriverConfigPtr cfg = NULL;
     virCapsPtr caps = NULL;
     qemuDomainObjPrivatePtr priv;
-    virDomainState state;
+    virDomainSnapshotState state;
 
     virCheckFlags(VIR_DOMAIN_SNAPSHOT_CREATE_REDEFINE |
                   VIR_DOMAIN_SNAPSHOT_CREATE_CURRENT |
@@ -15767,36 +15767,36 @@ qemuDomainSnapshotCreateXML(virDomainPtr domain,
     }
 
     /* allow snapshots only in certain states */
-    state = vm->state.state;
-    if (redefine)
-        state = def->state == VIR_DOMAIN_SNAPSHOT_DISK_SNAPSHOT ? VIR_DOMAIN_SHUTOFF :
-            def->state;
-    /* FIXME: state should be virDomainSnapshotState, with the switch
-     * statement handling of VIR_DOMAIN_SNAPSHOT_DISK_SNAPSHOT (the only
-     * enum value added beyond what virDomainState supports). But for
-     * now it doesn't matter, because we slammed the extra snapshot
-     * state into a safe domain state. */
+    state = redefine ? def->state : vm->state.state;
     switch (state) {
         /* valid states */
-    case VIR_DOMAIN_RUNNING:
-    case VIR_DOMAIN_PAUSED:
-    case VIR_DOMAIN_SHUTDOWN:
-    case VIR_DOMAIN_SHUTOFF:
-    case VIR_DOMAIN_CRASHED:
+    case VIR_DOMAIN_SNAPSHOT_RUNNING:
+    case VIR_DOMAIN_SNAPSHOT_PAUSED:
+    case VIR_DOMAIN_SNAPSHOT_SHUTDOWN:
+    case VIR_DOMAIN_SNAPSHOT_SHUTOFF:
+    case VIR_DOMAIN_SNAPSHOT_CRASHED:
+        break;
+
+    case VIR_DOMAIN_SNAPSHOT_DISK_SNAPSHOT:
+        if (!redefine) {
+            virReportError(VIR_ERR_INTERNAL_ERROR, _("Invalid domain state %s"),
+                           virDomainSnapshotStateTypeToString(state));
+            goto cleanup;
+        }
         break;
 
-    case VIR_DOMAIN_PMSUSPENDED:
+    case VIR_DOMAIN_SNAPSHOT_PMSUSPENDED:
         virReportError(VIR_ERR_OPERATION_UNSUPPORTED, "%s",
                        _("qemu doesn't support taking snapshots of "
                          "PMSUSPENDED guests"));
         goto cleanup;
 
         /* invalid states */
-    case VIR_DOMAIN_NOSTATE:
-    case VIR_DOMAIN_BLOCKED: /* invalid state, unused in qemu */
-    case VIR_DOMAIN_LAST:
+    case VIR_DOMAIN_SNAPSHOT_NOSTATE:
+    case VIR_DOMAIN_SNAPSHOT_BLOCKED: /* invalid state, unused in qemu */
+    case VIR_DOMAIN_SNAPSHOT_LAST:
         virReportError(VIR_ERR_INTERNAL_ERROR, _("Invalid domain state %s"),
-                       virDomainStateTypeToString(state));
+                       virDomainSnapshotStateTypeToString(state));
         goto cleanup;
     }
 
@@ -16474,14 +16474,9 @@ qemuDomainRevertToSnapshot(virDomainSnapshotPtr snapshot,
 
     cookie = (qemuDomainSaveCookiePtr) snap->def->cookie;
 
-    /* FIXME: This cast should be to virDomainSnapshotState, with
-     * better handling of VIR_DOMAIN_SNAPSHOT_DISK_SNAPSHOT (the only enum
-     * value added beyond what virDomainState supports). But for now
-     * it doesn't matter, because of the above rejection of revert to
-     * external snapshots. */
-    switch ((virDomainState) snap->def->state) {
-    case VIR_DOMAIN_RUNNING:
-    case VIR_DOMAIN_PAUSED:
+    switch ((virDomainSnapshotState) snap->def->state) {
+    case VIR_DOMAIN_SNAPSHOT_RUNNING:
+    case VIR_DOMAIN_SNAPSHOT_PAUSED:
 
         start_flags |= VIR_QEMU_PROCESS_START_PAUSED;
 
@@ -16656,9 +16651,9 @@ qemuDomainRevertToSnapshot(virDomainSnapshotPtr snapshot,
         }
         break;
 
-    case VIR_DOMAIN_SHUTDOWN:
-    case VIR_DOMAIN_SHUTOFF:
-    case VIR_DOMAIN_CRASHED:
+    case VIR_DOMAIN_SNAPSHOT_SHUTDOWN:
+    case VIR_DOMAIN_SNAPSHOT_SHUTOFF:
+    case VIR_DOMAIN_SNAPSHOT_CRASHED:
         /* Transitions 1, 4, 7 */
         /* Newer qemu -loadvm refuses to revert to the state of a snapshot
          * created by qemu-img snapshot -c.  If the domain is running, we
@@ -16715,15 +16710,17 @@ qemuDomainRevertToSnapshot(virDomainSnapshotPtr snapshot,
         }
         break;
 
-    case VIR_DOMAIN_PMSUSPENDED:
+    case VIR_DOMAIN_SNAPSHOT_PMSUSPENDED:
         virReportError(VIR_ERR_OPERATION_UNSUPPORTED, "%s",
                        _("qemu doesn't support reversion of snapshot taken in "
                          "PMSUSPENDED state"));
         goto endjob;
 
-    case VIR_DOMAIN_NOSTATE:
-    case VIR_DOMAIN_BLOCKED:
-    case VIR_DOMAIN_LAST:
+    case VIR_DOMAIN_SNAPSHOT_DISK_SNAPSHOT:
+        /* Rejected earlier as an external snapshot */
+    case VIR_DOMAIN_SNAPSHOT_NOSTATE:
+    case VIR_DOMAIN_SNAPSHOT_BLOCKED:
+    case VIR_DOMAIN_SNAPSHOT_LAST:
         virReportError(VIR_ERR_INTERNAL_ERROR,
                        _("Invalid target domain state '%s'. Refusing "
                          "snapshot reversion"),