From 6ceef36acb11819b255732b1de0ca62885da04bd Mon Sep 17 00:00:00 2001
From: Kevin Wolf <kwolf@redhat.com>
Date: Mon, 8 Oct 2018 17:27:18 +0200
Subject: [PATCH] curl: Support auto-read-only option

If read-only=off, but auto-read-only=on is given, just degrade to
read-only.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
---
 block/curl.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/block/curl.c b/block/curl.c
index fabb2b4da7..db5d2bd8ef 100644
--- a/block/curl.c
+++ b/block/curl.c
@@ -684,10 +684,10 @@ static int curl_open(BlockDriverState *bs, QDict *options, int flags,
     const char *protocol_delimiter;
     int ret;
 
-
-    if (flags & BDRV_O_RDWR) {
-        error_setg(errp, "curl block device does not support writes");
-        return -EROFS;
+    ret = bdrv_apply_auto_read_only(bs, "curl driver does not support writes",
+                                    errp);
+    if (ret < 0) {
+        return ret;
     }
 
     if (!libcurl_initialized) {