From: Alex Ng <alexng@messages.microsoft.com>
Date: Sun, 30 Apr 2017 16:21:14 -0700
Patch-mainline: v4.13-rc1
Subject: Tools: hv: vss: Thaw the filesystem and continue if freeze call has timed out
Git-commit: 6113e3d28149dee33f10e92df6a16efb2b9cf473
References: fate#323887

If a FREEZE operation takes too long, the driver may time out and move on
to another  operation. The daemon is unaware of this and attempts to
notify the driver that the FREEZE succeeded. This results in an error from
the driver and the daemon leaves the filesystem in frozen state.

Fix this by thawing the filesystem and continuing.

Signed-off-by: Michael Gissing <mg@faulpeltz.net>
Signed-off-by: Alex Ng <alexng@messages.microsoft.com>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Olaf Hering <ohering@suse.de>
---
 tools/hv/hv_vss_daemon.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/tools/hv/hv_vss_daemon.c b/tools/hv/hv_vss_daemon.c
--- a/tools/hv/hv_vss_daemon.c
+++ b/tools/hv/hv_vss_daemon.c
@@ -261,7 +261,9 @@ int main(int argc, char *argv[])
 		if (len != sizeof(struct hv_vss_msg)) {
 			syslog(LOG_ERR, "write failed; error: %d %s", errno,
 			       strerror(errno));
-			exit(EXIT_FAILURE);
+
+			if (op == VSS_OP_FREEZE)
+				vss_operate(VSS_OP_THAW);
 		}
 	}