From 8317e8d4689f486f7dd2ee7cbf79cbee4c66cb9e Mon Sep 17 00:00:00 2001
From: yoe <yoe>
Date: Mon, 17 Mar 2008 10:20:01 +0000
Subject: [PATCH] r326: Don't require read-write access to base file when
 doing copy on write

---
 nbd-server.c |    8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/nbd-server.c b/nbd-server.c
index 1606d5d..315d44e 100644
--- a/nbd-server.c
+++ b/nbd-server.c
@@ -1220,8 +1220,12 @@ void setupexport(CLIENT* client) {
 			/* Try again because maybe media was read-only */
 			fi.fhandle = open(tmpname, O_RDONLY);
 			if(fi.fhandle != -1) {
-				client->server->flags |= F_AUTOREADONLY;
-				client->server->flags |= F_READONLY;
+				/* Opening the base file in copyonwrite mode is
+				 * okay */
+				if(!(client->server->flags & F_COPYONWRITE)) {
+					client->server->flags |= F_AUTOREADONLY;
+					client->server->flags |= F_READONLY;
+				}
 			}
 		}
 		if(fi.fhandle == -1) {
-- 
1.7.10.4