block: Create proper size file for disk mirror

The qmp monitor command to mirror a disk was passing -1 for size
along with the disk's backing file. This size of the resulting disk
is the size of the backing file, which is incorrect if the disk
has been resized. Therefore we should always pass in the size of
the current disk.

Signed-off-by: Vishvananda Ishaya <vishvananda@gmail.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

diff --git a/blockdev.c b/blockdev.c
index ac396f3c945e00f4220323387250678a2f30d867..fdc573f5198d7096ccc98ddc50ce28475d4ca5c5 100644 (file)
--- a/blockdev.c
+++ b/blockdev.c
@@ -1282,11 +1282,11 @@ void qmp_drive_mirror(const char *device, const char *target,
         return;
     }
 
+    bdrv_get_geometry(bs, &size);
+    size *= 512;
     if (sync == MIRROR_SYNC_MODE_FULL && mode != NEW_IMAGE_MODE_EXISTING) {
         /* create new image w/o backing file */
         assert(format && drv);
-        bdrv_get_geometry(bs, &size);
-        size *= 512;
         bdrv_img_create(target, format,
                         NULL, NULL, NULL, size, flags, &local_err);
     } else {
@@ -1299,7 +1299,7 @@ void qmp_drive_mirror(const char *device, const char *target,
             bdrv_img_create(target, format,
                             source->filename,
                             source->drv->format_name,
-                            NULL, -1, flags, &local_err);
+                            NULL, size, flags, &local_err);
             break;
         default:
             abort();