From d6aa08ac3693be3e08f2c8d3ad5a356ea6e9dead Mon Sep 17 00:00:00 2001
From: WangJian <wangjian161@huawei.com>
Date: Wed, 9 Feb 2022 10:55:08 +0800
Subject: [PATCH] qemu-nbd: set timeout to qemu-nbd socket

In case of insufficient memory and kill-9,
the NBD socket cannot be processed and stuck all the time.

Signed-off-by: wangjian161 <wangjian161@huawei.com>
---
 nbd/client.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/nbd/client.c b/nbd/client.c
index 29ffc609a4..987dde43c7 100644
--- a/nbd/client.c
+++ b/nbd/client.c
@@ -24,6 +24,8 @@
 #include "nbd-internal.h"
 #include "qemu/cutils.h"
 
+#define NBD_TIMEOUT_SECONDS 30
+
 /* Definitions for opaque data types */
 
 static QTAILQ_HEAD(, NBDExport) exports = QTAILQ_HEAD_INITIALIZER(exports);
@@ -1310,6 +1312,12 @@ int nbd_init(int fd, QIOChannelSocket *sioc, NBDExportInfo *info,
         }
     }
 
+    if (ioctl(fd, NBD_SET_TIMEOUT, NBD_TIMEOUT_SECONDS) < 0) {
+        int serrno = errno;
+        error_setg(errp, "Failed setting timeout");
+        return -serrno;
+    }
+
     trace_nbd_init_finish();
 
     return 0;
-- 
2.27.0