conf: Add virDomainDiskSetBlockIOTune

That function sets disk->blkdeviotune sensibly.

Signed-off-by: Martin Kletzander <mkletzan@redhat.com>

src/conf/domain_conf.c

@@ -25845,3 +25845,30 @@ virDomainDefVcpuOrderClear(virDomainDefPtr def)
     for (i = 0; i < def->maxvcpus; i++)
         def->vcpus[i]->order = 0;
 }
+
+
+/**
+ * virDomainDiskSetBlockIOTune:
+ * @disk: The disk to set block I/O tuning on
+ * @info: The BlockIoTuneInfo to be set on the @disk
+ *
+ * Set the block I/O tune settings from @info on the @disk, but error out early
+ * in case of any error.  That is to make sure nothing will fail half-way.
+ *
+ * Returns: 0 on success, -1 otherwise
+ */
+int
+virDomainDiskSetBlockIOTune(virDomainDiskDefPtr disk,
+                            virDomainBlockIoTuneInfo *info)
+{
+    char *tmp_group = NULL;
+
+    if (VIR_STRDUP(tmp_group, info->group_name) < 0)
+        return -1;
+
+    VIR_FREE(disk->blkdeviotune.group_name);
+    disk->blkdeviotune = *info;
+    VIR_STEAL_PTR(disk->blkdeviotune.group_name, tmp_group);
+
+    return 0;
+}

src/conf/domain_conf.h

@@ -3219,4 +3219,8 @@ bool
 virDomainDeviceInfoAddressIsEqual(const virDomainDeviceInfo *a,
                                   const virDomainDeviceInfo *b)
     ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2) ATTRIBUTE_RETURN_CHECK;
+
+int virDomainDiskSetBlockIOTune(virDomainDiskDefPtr disk,
+                                virDomainBlockIoTuneInfo *info);
+
 #endif /* __DOMAIN_CONF_H */

src/libvirt_private.syms

@@ -314,6 +314,7 @@ virDomainDiskMirrorStateTypeToString;
 virDomainDiskPathByName;
 virDomainDiskRemove;
 virDomainDiskRemoveByName;
+virDomainDiskSetBlockIOTune;
 virDomainDiskSetDriver;
 virDomainDiskSetFormat;
 virDomainDiskSetSource;