From 2658b9616fe63d2fd9e2654676877ab014639a92 Mon Sep 17 00:00:00 2001
From: Theodore Ts'o <tytso@mit.edu>
Date: Thu, 6 Dec 2012 11:21:44 -0500
Subject: [PATCH] contrib/fallocate: add support for punch functionality

Also fix the -o option so it works correctly (instead of core
dumping).

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
---
 contrib/fallocate.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/contrib/fallocate.c b/contrib/fallocate.c
index 0e8319fe..1436b701 100644
--- a/contrib/fallocate.c
+++ b/contrib/fallocate.c
@@ -35,6 +35,7 @@
 
 // #include <linux/falloc.h>
 #define FALLOC_FL_KEEP_SIZE	0x01
+#define FALLOC_FL_PUNCH_HOLE	0x02 /* de-allocates range */
 
 void usage(void)
 {
@@ -94,12 +95,17 @@ int main(int argc, char **argv)
 	int	error;
 	int	tflag = 0;
 
-	while ((opt = getopt(argc, argv, "nl:ot")) != -1) {
+	while ((opt = getopt(argc, argv, "npl:o:t")) != -1) {
 		switch(opt) {
 		case 'n':
 			/* do not change filesize */
 			falloc_mode = FALLOC_FL_KEEP_SIZE;
 			break;
+		case 'p':
+			/* punch mode */
+			falloc_mode = (FALLOC_FL_PUNCH_HOLE |
+				       FALLOC_FL_KEEP_SIZE);
+			break;
 		case 'l':
 			length = cvtnum(optarg);
 			break;