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[libvirt] [PATCH] storage: Ensure 'qemu-img resize' size arg is a 512 multiple



qemu-img resize will fail with "The new size must be a multiple of 512"
if libvirt doesn't round it first.
This fixes rhbz#951495

Signed-off-by: Christophe Fergeau <cfergeau redhat com>
---
 src/storage/storage_backend_fs.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/storage/storage_backend_fs.c b/src/storage/storage_backend_fs.c
index 9b83e57..99973b0 100644
--- a/src/storage/storage_backend_fs.c
+++ b/src/storage/storage_backend_fs.c
@@ -1219,6 +1219,10 @@ virStorageBackendFilesystemResizeQemuImg(const char *path,
         return -1;
     }
 
+    /* Round capacity up to the closest 512 multiple as qemu-img errors out
+     * on sizes which are not a multiple of 512 */
+    capacity = (capacity + 511) / 512 * 512;
+
     cmd = virCommandNew(img_tool);
     virCommandAddArgList(cmd, "resize", path, NULL);
     virCommandAddArgFormat(cmd, "%llu", capacity);
-- 
1.8.2.1


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