[libvirt] [PATCH v4 10/23] lock_driver: Introduce VIR_LOCK_MANAGER_RESOURCE_TYPE_METADATA

[Michal Privoznik]

This is a new type of object that lock drivers can handle.
Currently, it is supported by lockd driver only.

Signed-off-by: Michal Privoznik <mprivozn at redhat.com>
Reviewed-by: John Ferlan <jferlan at redhat.com>
---
 src/locking/lock_driver.h         |  2 ++
 src/locking/lock_driver_lockd.c   | 47 ++++++++++++++++++++++++++++-----------
 src/locking/lock_driver_sanlock.c |  3 ++-
 3 files changed, 38 insertions(+), 14 deletions(-)

diff --git a/src/locking/lock_driver.h b/src/locking/lock_driver.h
index a9d2041c30..9be0abcfba 100644
--- a/src/locking/lock_driver.h
+++ b/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 {
diff --git a/src/locking/lock_driver_lockd.c b/src/locking/lock_driver_lockd.c
index 98953500b7..cb294ac694 100644
--- a/src/locking/lock_driver_lockd.c
+++ b/src/locking/lock_driver_lockd.c
@@ -557,7 +557,7 @@ 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 |
@@ -569,7 +569,7 @@ 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",
@@ -596,7 +596,7 @@ 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();
@@ -613,7 +613,7 @@ 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();
@@ -625,7 +625,7 @@ 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)
@@ -670,6 +670,8 @@ 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"),
@@ -679,6 +681,29 @@ 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"),
@@ -686,19 +711,15 @@ 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:
diff --git a/src/locking/lock_driver_sanlock.c b/src/locking/lock_driver_sanlock.c
index fe422d3be6..9393e7d9a2 100644
--- a/src/locking/lock_driver_sanlock.c
+++ b/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"),
-- 
2.16.4