From 155bec4cf22d20c41ce4be93e3a0080b4ef7c7a2 Mon Sep 17 00:00:00 2001
From: Igor Canadi <icanadi@fb.com>
Date: Thu, 15 Jan 2015 14:15:43 -0800
Subject: [PATCH] fallocate also tests FALLOC_FL_KEEP_SIZE

---
 build_tools/build_detect_platform | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/build_tools/build_detect_platform b/build_tools/build_detect_platform
index c17cd3ead8..5ad5552ce7 100755
--- a/build_tools/build_detect_platform
+++ b/build_tools/build_detect_platform
@@ -184,7 +184,7 @@ else
       #include <fcntl.h>
       int main() {
 	int fd = open("/dev/null", 0);
-	fallocate(fd, 0, 0, 1024);
+  fallocate(fd, FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE, 0, 1024);
       }
 EOF
     if [ "$?" = 0 ]; then