From e306f93a4a43e2e09dd1bf334a1f012e7ac33c2e Mon Sep 17 00:00:00 2001
From: Martin <martin@urbackup.org>
Date: Thu, 24 Oct 2019 17:31:38 +0200
Subject: [PATCH] Handle EINVAL error return of BTRFS_IOC_SYNC

(cherry picked from commit dced36d9aa1f2bc540e06a5fe6d67d3140c2e504)
---
 urbackupcommon/os_functions_lin.cpp | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/urbackupcommon/os_functions_lin.cpp b/urbackupcommon/os_functions_lin.cpp
index 045c0699..c32bb260 100644
--- a/urbackupcommon/os_functions_lin.cpp
+++ b/urbackupcommon/os_functions_lin.cpp
@@ -1326,7 +1326,8 @@ bool os_sync(const std::string & path)
 	{
 		if(ioctl(fd, BTRFS_IOC_SYNC, NULL)==-1)
 		{
-			if(errno!=ENOTTY && errno!=ENOSYS)
+			if(errno!=ENOTTY && errno!=ENOSYS 
+				&& errno!=EINVAL)
 			{
 				close(fd);
 				return false;
@@ -1341,8 +1342,7 @@ bool os_sync(const std::string & path)
 #if defined(HAVE_SYNCFS)
 		if(syncfs(fd)!=0)
 		{
-			if(errno==ENOSYS
-				|| errno==EINVAL)
+			if(errno==ENOSYS)
 			{
 				close(fd);
 				sync();