From 5154dc529f4cd85ba7439e5e875c52ea690954b3 Mon Sep 17 00:00:00 2001
From: Vitaliy Filippov <vitalif@yourcmc.ru>
Date: Thu, 21 Feb 2019 02:28:36 +0300
Subject: [PATCH] Bigger bug O_o

---
 era_copy.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/era_copy.c b/era_copy.c
index ff8a9d2..745520c 100644
--- a/era_copy.c
+++ b/era_copy.c
@@ -8,6 +8,7 @@
  * License: GNU GPLv3.0 or later
  */
 
+#define _GNU_SOURCE
 #define _LARGEFILE64_SOURCE
 #include <sys/types.h>
 #include <sys/stat.h>
@@ -122,7 +123,8 @@ void era_copy(char *src_path, int era_block_size, int print_progress)
 	int src = -1;
 	if (src_path != NULL)
 	{
-		src = open(src_path, O_RDONLY|O_LARGEFILE);
+		// dm-era device may return incorrect data when used without O_DIRECT O_o
+		src = open(src_path, O_RDONLY|O_LARGEFILE|O_DIRECT);
 		if (src < 0)
 		{
 			fprintf(stderr, "Failed to open %s for reading: %s\n", src_path, strerror(errno));