qemu-img: find the image end offset during check

This patch adds the support for reporting the image end offset (in
bytes). This is particularly useful after a conversion (or a rebase)
where the destination is a block device in order to find the first
unused byte at the end of the image.

Signed-off-by: Federico Simoncelli <fsimonce@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/qemu-img.c b/qemu-img.c
index 85d3740..e80c1c5 100644
--- a/qemu-img.c
+++ b/qemu-img.c
@@ -475,6 +475,10 @@ static int img_check(int argc, char **argv)
         result.bfi.fragmented_clusters * 100.0 / result.bfi.allocated_clusters);
     }
 
+    if (result.image_end_offset > 0) {
+        printf("Image end offset: %" PRId64 "\n", result.image_end_offset);
+    }
+
     bdrv_delete(bs);
 
     if (ret < 0 || result.check_errors) {