Specify that the <allocation> parameter for the newly-created qcow2
image is 0 so that only metadata gets preallocated. Otherwise the
storage driver code instructs qemu to use 'fallocate' preallocation mode
and considers the image fully allocated.
Signed-off-by: Peter Krempa <pkrempa@xxxxxxxxxx>
---
src/qemu/qemu_migration.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/src/qemu/qemu_migration.c b/src/qemu/qemu_migration.c
index 7f905f8584..b686e42e58 100644
--- a/src/qemu/qemu_migration.c
+++ b/src/qemu/qemu_migration.c
@@ -361,6 +361,8 @@ qemuMigrationDstPrecreateDisk(virConnectPtr *conn,
virBufferAddLit(&buf, "<volume>\n");
virBufferAdjustIndent(&buf, 2);
virBufferEscapeString(&buf, "<name>%s</name>\n", volName);
+ if (disk->src->format == VIR_STORAGE_FILE_QCOW2)
+ virBufferAddLit(&buf, "<allocation>0</allocation>\n");
virBufferAsprintf(&buf, "<capacity>%llu</capacity>\n", capacity);
virBufferAddLit(&buf, "<target>\n");
virBufferAdjustIndent(&buf, 2);
--
2.46.0
