From 7abd6acebf8f8edbebb7572c34c2d1962b56f92f Mon Sep 17 00:00:00 2001
From: Nick Terrell <terrelln@fb.com>
Date: Tue, 18 Dec 2018 15:40:27 -0800
Subject: [PATCH] Also compare device thanks to @felixhandte

---
 programs/fileio.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/programs/fileio.c b/programs/fileio.c
index c415ea67..9ba8c637 100644
--- a/programs/fileio.c
+++ b/programs/fileio.c
@@ -420,7 +420,7 @@ static FILE* FIO_openDstFile(const char* srcFileName, const char* dstFileName)
         stat_t srcStat;
         stat_t dstStat;
         if (UTIL_getFileStat(srcFileName, &srcStat) && UTIL_getFileStat(dstFileName, &dstStat)) {
-            if (srcStat.st_ino == dstStat.st_ino) {
+            if (srcStat.st_dev == dstStat.st_dev && srcStat.st_ino == dstStat.st_ino) {
                 DISPLAYLEVEL(1, "zstd: Refusing to open a output file which will overwrite the input file \n");
                 return NULL;
             }