commit c9fbb99d41b05acf0d7b93deb2fcdbf9047c238e
author Kevin Wolf <kwolf@redhat.com> Thu Nov 28 11:58:02 2013 +0100
committer Kevin Wolf <kwolf@redhat.com> Fri Nov 29 17:41:09 2013 +0100
tree d69b04e2510ced9bc17efaa992ec78b79ab38280
parent f32f988c7778d0f1ff9c7e8d7547a354a7fdd3f6

block: Use BDRV_O_NO_BACKING where appropriate

If you open an image temporarily just because you want to check its size
or get it flushed, there's no real reason to open the whole backing file
chain.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Reviewed-by: Benoit Canet <benoit@irqsave.net>

block.c

diff --git a/block.c b/block.c
index 08dd7f2..3d78581 100644
--- a/block.c
+++ b/block.c
@@ -1061,7 +1061,8 @@
         /* Get the required size from the image */
         bs1 = bdrv_new("");
         QINCREF(options);
-        ret = bdrv_open(bs1, filename, options, 0, drv, &local_err);
+        ret = bdrv_open(bs1, filename, options, BDRV_O_NO_BACKING,
+                        drv, &local_err);
         if (ret < 0) {
             bdrv_unref(bs1);
             goto fail;