[PATCH] qemu-nbd: set timeout to qemu-nbd socket

[luzhipeng]

From: lu zhipeng <luzhipeng@cestc.cn>

Prevent the NBD socket stuck all the time, So
set timeout.

Signed-off-by: lu zhipeng <luzhipeng@cestc.cn>
---
 nbd/client.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/nbd/client.c b/nbd/client.c
index 30d5383cb1..89dde53a0f 100644
--- a/nbd/client.c
+++ b/nbd/client.c
@@ -24,6 +24,8 @@
 #include "nbd-internal.h"
 #include "qemu/cutils.h"
 
+#define NBD_DEFAULT_TIMEOUT 30
+
 /* Definitions for opaque data types */
 
 static QTAILQ_HEAD(, NBDExport) exports = QTAILQ_HEAD_INITIALIZER(exports);
@@ -1301,6 +1303,12 @@ int nbd_init(int fd, QIOChannelSocket *sioc, 
NBDExportInfo *info,
         }
     }
 
+    if (ioctl(fd, NBD_SET_TIMEOUT, NBD_DEFAULT_TIMEOUT) < 0) {
+        int serrno = errno;
+        error_setg(errp, "Failed setting timeout");
+        return -serrno;
+    }
+
     trace_nbd_init_finish();
 
     return 0;
-- 
2.31.1