sync_files: #include _GNU_SOURCE for syncfs()

Hopefully fixes: #1316
Signed-off-by: Sage Weil <sage@newdream.net>

diff --git a/src/common/sync_filesystem.h b/src/common/sync_filesystem.h
index 04cfc99939017470b2aa00f4dc5a5c8dee8642c4..3612dc7d3027bc0a8c9f69e76d948997f95f1749 100644 (file)
--- a/src/common/sync_filesystem.h
+++ b/src/common/sync_filesystem.h
@@ -15,6 +15,7 @@
 #ifndef CEPH_SYNC_FILESYSTEM_H
 #define CEPH_SYNC_FILESYSTEM_H
 
+#define _GNU_SOURCE
 #include <unistd.h>
 
 inline int sync_filesystem(int fd)