From 5f4a6b42c0d7fd2937db9314f4752f90bcc40d9c Mon Sep 17 00:00:00 2001
From: Bo Chen <chen.bo@intel.com>
Date: Fri, 16 Sep 2022 13:45:56 -0700
Subject: [PATCH] qcow: Fix wrong alignment calculation

With the existing code, `round_up(7, 2)` would generate `6` which is
obviously wrong. Also, following what's done for 'round_down()', the
fixed code does not handle 'alignment == 0' explicitly.

Signed-off-by: Bo Chen <chen.bo@intel.com>
---
 qcow/src/raw_file.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/qcow/src/raw_file.rs b/qcow/src/raw_file.rs
index 5b449e4b2..886f0481f 100644
--- a/qcow/src/raw_file.rs
+++ b/qcow/src/raw_file.rs
@@ -69,7 +69,7 @@ impl RawFile {
 
     fn round_up(&self, offset: u64) -> u64 {
         let align: u64 = self.alignment.try_into().unwrap();
-        ((offset / (align + 1)) + 1) * align
+        ((offset + align - 1) / align) * align
     }
 
     fn round_down(&self, offset: u64) -> u64 {