lock_driver: Introduce VIR_LOCK_MANAGER_RESOURCE_TYPE_METADATA

This is a new type of object that lock drivers can handle.
Currently, it is supported by lockd driver only.
Signed-off-by: NMichal Privoznik <mprivozn@redhat.com>
Reviewed-by: NJohn Ferlan <jferlan@redhat.com>

src/locking/lock_driver.h

@@ -51,6 +51,8 @@ typedef enum {
     VIR_LOCK_MANAGER_RESOURCE_TYPE_DISK = 0,
     /* A lease against an arbitrary resource */
     VIR_LOCK_MANAGER_RESOURCE_TYPE_LEASE = 1,
+    /* The resource to be locked is a metadata */
+    VIR_LOCK_MANAGER_RESOURCE_TYPE_METADATA = 2,
 } virLockManagerResourceType;
 
 typedef enum {

src/locking/lock_driver_lockd.c

@@ -563,7 +563,7 @@ static int virLockManagerLockDaemonAddResource(virLockManagerPtr lock,
     virLockManagerLockDaemonPrivatePtr priv = lock->privateData;
     char *newName = NULL;
     char *newLockspace = NULL;
-    bool autoCreate = false;
+    int newFlags = 0;
     int ret = -1;
 
     virCheckFlags(VIR_LOCK_MANAGER_RESOURCE_READONLY |
@@ -575,7 +575,7 @@ static int virLockManagerLockDaemonAddResource(virLockManagerPtr lock,
     switch (priv->type) {
     case VIR_LOCK_MANAGER_OBJECT_TYPE_DOMAIN:
 
-        switch (type) {
+        switch ((virLockManagerResourceType) type) {
         case VIR_LOCK_MANAGER_RESOURCE_TYPE_DISK:
             if (params || nparams) {
                 virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
@@ -602,7 +602,7 @@ static int virLockManagerLockDaemonAddResource(virLockManagerPtr lock,
                     VIR_DEBUG("Got an LVM UUID %s for %s", newName, name);
                     if (VIR_STRDUP(newLockspace, driver->lvmLockSpaceDir) < 0)
                         goto cleanup;
-                    autoCreate = true;
+                    newFlags |= VIR_LOCK_SPACE_PROTOCOL_ACQUIRE_RESOURCE_AUTOCREATE;
                     break;
                 }
                 virResetLastError();
@@ -619,7 +619,7 @@ static int virLockManagerLockDaemonAddResource(virLockManagerPtr lock,
                     VIR_DEBUG("Got an SCSI ID %s for %s", newName, name);
                     if (VIR_STRDUP(newLockspace, driver->scsiLockSpaceDir) < 0)
                         goto cleanup;
-                    autoCreate = true;
+                    newFlags |= VIR_LOCK_SPACE_PROTOCOL_ACQUIRE_RESOURCE_AUTOCREATE;
                     break;
                 }
                 virResetLastError();
@@ -631,7 +631,7 @@ static int virLockManagerLockDaemonAddResource(virLockManagerPtr lock,
                     goto cleanup;
                 if (virCryptoHashString(VIR_CRYPTO_HASH_SHA256, name, &newName) < 0)
                     goto cleanup;
-                autoCreate = true;
+                newFlags |= VIR_LOCK_SPACE_PROTOCOL_ACQUIRE_RESOURCE_AUTOCREATE;
                 VIR_DEBUG("Using indirect lease %s for %s", newName, name);
             } else {
                 if (VIR_STRDUP(newLockspace, "") < 0)
@@ -676,6 +676,8 @@ static int virLockManagerLockDaemonAddResource(virLockManagerPtr lock,
                 goto cleanup;
 
         }   break;
+
+        case VIR_LOCK_MANAGER_RESOURCE_TYPE_METADATA:
         default:
             virReportError(VIR_ERR_INTERNAL_ERROR,
                            _("Unknown lock manager object type %d for domain lock object"),
@@ -685,6 +687,29 @@ static int virLockManagerLockDaemonAddResource(virLockManagerPtr lock,
         break;
 
     case VIR_LOCK_MANAGER_OBJECT_TYPE_DAEMON:
+        switch ((virLockManagerResourceType) type) {
+        case VIR_LOCK_MANAGER_RESOURCE_TYPE_METADATA:
+            if (params || nparams) {
+                virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
+                               _("Unexpected parameters for metadata resource"));
+                goto cleanup;
+            }
+            if (VIR_STRDUP(newLockspace, "") < 0 ||
+                VIR_STRDUP(newName, name) < 0)
+                goto cleanup;
+            newFlags |= VIR_LOCK_SPACE_PROTOCOL_ACQUIRE_RESOURCE_METADATA;
+            break;
+
+        case VIR_LOCK_MANAGER_RESOURCE_TYPE_DISK:
+        case VIR_LOCK_MANAGER_RESOURCE_TYPE_LEASE:
+        default:
+            virReportError(VIR_ERR_INTERNAL_ERROR,
+                           _("Unknown lock manager object type %d for daemon lock object"),
+                           type);
+            goto cleanup;
+        }
+        break;
+
     default:
         virReportError(VIR_ERR_INTERNAL_ERROR,
                        _("Unknown lock manager object type %d"),
@@ -692,19 +717,15 @@ static int virLockManagerLockDaemonAddResource(virLockManagerPtr lock,
         goto cleanup;
     }
 
+    if (flags & VIR_LOCK_MANAGER_RESOURCE_SHARED)
+        newFlags |= VIR_LOCK_SPACE_PROTOCOL_ACQUIRE_RESOURCE_SHARED;
+
     if (VIR_EXPAND_N(priv->resources, priv->nresources, 1) < 0)
         goto cleanup;
 
     VIR_STEAL_PTR(priv->resources[priv->nresources-1].lockspace, newLockspace);
     VIR_STEAL_PTR(priv->resources[priv->nresources-1].name, newName);
-
-    if (flags & VIR_LOCK_MANAGER_RESOURCE_SHARED)
-        priv->resources[priv->nresources-1].flags |=
-            VIR_LOCK_SPACE_PROTOCOL_ACQUIRE_RESOURCE_SHARED;
-
-    if (autoCreate)
-        priv->resources[priv->nresources-1].flags |=
-            VIR_LOCK_SPACE_PROTOCOL_ACQUIRE_RESOURCE_AUTOCREATE;
+    priv->resources[priv->nresources-1].flags = newFlags;
 
     ret = 0;
  cleanup:

src/locking/lock_driver_sanlock.c

@@ -815,7 +815,7 @@ static int virLockManagerSanlockAddResource(virLockManagerPtr lock,
     if (flags & VIR_LOCK_MANAGER_RESOURCE_READONLY)
         return 0;
 
-    switch (type) {
+    switch ((virLockManagerResourceType) type) {
     case VIR_LOCK_MANAGER_RESOURCE_TYPE_DISK:
         if (driver->autoDiskLease) {
             if (virLockManagerSanlockAddDisk(driver, lock, name, nparams, params,
@@ -839,6 +839,7 @@ static int virLockManagerSanlockAddResource(virLockManagerPtr lock,
             return -1;
         break;
 
+    case VIR_LOCK_MANAGER_RESOURCE_TYPE_METADATA:
     default:
         virReportError(VIR_ERR_INTERNAL_ERROR,
                        _("Unknown lock manager object type %d for domain lock object"),