From cf25bd74b082b8334434e8726ff4fe2f18b9dba9 Mon Sep 17 00:00:00 2001
From: Sebastien Boeuf <sebastien.boeuf@intel.com>
Date: Fri, 24 Jan 2020 08:37:57 +0100
Subject: [PATCH] qcow: Fix map_err losing the inner error

Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
---
 qcow/src/qcow.rs | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/qcow/src/qcow.rs b/qcow/src/qcow.rs
index a0a0cf7d9..9099f0f9f 100755
--- a/qcow/src/qcow.rs
+++ b/qcow/src/qcow.rs
@@ -1221,7 +1221,12 @@ impl QcowFile {
         let refcount = self
             .refcounts
             .get_cluster_refcount(&mut self.raw_file, cluster_addr)
-            .map_err(|_| std::io::Error::from_raw_os_error(EINVAL))?;
+            .map_err(|e| {
+                io::Error::new(
+                    io::ErrorKind::InvalidData,
+                    format!("failed to get cluster refcount: {}", e),
+                )
+            })?;
         if refcount == 0 {
             return Err(std::io::Error::from_raw_os_error(EINVAL));
         }