From 7780d47211bde838c7f7e9330608e5397219066e Mon Sep 17 00:00:00 2001
From: Fam Zheng <famz@redhat.com>
Date: Thu, 22 Aug 2013 15:36:59 +0800
Subject: [PATCH] block: better error message for read only format name
When user tries to use read-only whitelist format in the command line
option, failure message was "'foo' invalid format". It might be invalid
only for writable, but valid for read-only, so it is confusing. Give the
user easier to understand information.
Signed-off-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
---
blockdev.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/blockdev.c b/blockdev.c
index bc7016a8d4b..d3500c61337 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -487,7 +487,11 @@ static DriveInfo *blockdev_init(QemuOpts *all_opts,
drv = bdrv_find_whitelisted_format(buf, ro);
if (!drv) {
- error_report("'%s' invalid format", buf);
+ if (!ro && bdrv_find_whitelisted_format(buf, !ro)) {
+ error_report("'%s' can be only used as read-only device.", buf);
+ } else {
+ error_report("'%s' invalid format", buf);
+ }
return NULL;
}
}
--
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