qemu: block: Add generator for the 'copy-on-read' blockdev driver

The copy on read functionality is done using a separate layer in the
backing chain. Add function to generate properties for it.

Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>

diff --git a/src/qemu/qemu_block.c b/src/qemu/qemu_block.c
index ccdd3343675df7bfad3343f1b75c3e4e6a01b4f0..5321dda31628d75d8fef87ae4cffbff11c602f75 100644 (file)
--- a/src/qemu/qemu_block.c
+++ b/src/qemu/qemu_block.c
@@ -1745,3 +1745,25 @@ qemuBlockSnapshotAddLegacy(virJSONValuePtr actions,
     VIR_FREE(source);
     return ret;
 }
+
+
+/**
+ * qemuBlockStorageGetCopyOnReadProps:
+ * @disk: disk with copy-on-read enabled
+ *
+ * Creates blockdev properties for a disk copy-on-read layer.
+ */
+virJSONValuePtr
+qemuBlockStorageGetCopyOnReadProps(virDomainDiskDefPtr disk)
+{
+    qemuDomainDiskPrivatePtr priv = QEMU_DOMAIN_DISK_PRIVATE(disk);
+    virJSONValuePtr ret = NULL;
+
+    ignore_value(virJSONValueObjectCreate(&ret,
+                                          "s:driver", "copy-on-read",
+                                          "s:node-name", priv->nodeCopyOnRead,
+                                          "s:file", disk->src->nodeformat,
+                                          NULL));
+
+    return ret;
+}

diff --git a/src/qemu/qemu_block.h b/src/qemu/qemu_block.h
index fd8984e60b54cc8db52c4e37dcae6a983b0d9cb8..62ed5027cbfb6a16960fda438aa6f9a8946a6bf6 100644 (file)
--- a/src/qemu/qemu_block.h
+++ b/src/qemu/qemu_block.h
@@ -67,6 +67,8 @@ qemuBlockStorageSourceGetURI(virStorageSourcePtr src);
 virJSONValuePtr
 qemuBlockStorageSourceGetBlockdevProps(virStorageSourcePtr src);
 
+virJSONValuePtr
+qemuBlockStorageGetCopyOnReadProps(virDomainDiskDefPtr disk);
 
 typedef struct qemuBlockStorageSourceAttachData qemuBlockStorageSourceAttachData;
 typedef qemuBlockStorageSourceAttachData *qemuBlockStorageSourceAttachDataPtr;