Propagate the cluster size from the original image as the user might
have configured a custom cluster size for performance reasons. Propagate
the cluster size of a qcow2 image to the new overlay or copy.
Signed-off-by: Peter Krempa <pkrempa@xxxxxxxxxx>
---
src/qemu/qemu_block.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/src/qemu/qemu_block.c b/src/qemu/qemu_block.c
index 0113c64f0f..6e8fe545b4 100644
--- a/src/qemu/qemu_block.c
+++ b/src/qemu/qemu_block.c
@@ -2789,6 +2789,11 @@ qemuBlockStorageSourceCreateDetectSize(virHashTablePtr blockNamedNodeData,
return -1;
}
+ /* propagate cluster size if the images are compatible */
+ if (templ->format == VIR_STORAGE_FILE_QCOW2 &&
+ src->format == VIR_STORAGE_FILE_QCOW2)
+ src->clusterSize = entry->clusterSize;
+
if (src->format == VIR_STORAGE_FILE_RAW) {
src->physical = entry->capacity;
} else {
--
2.26.2
