zdtm: check an unlinked file when a file with the save name exists

Signed-off-by: Andrew Vagin <avagin@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

test/zdtm/live/static/Makefile

@@ -146,6 +146,7 @@ TST_FILE	=				\
 		deleted_dev			\
 		unlink_fstat00			\
 		unlink_fstat01			\
+		unlink_fstat01+			\
 		unlink_fstat02			\
 		unlink_fstat03			\
 		unlink_largefile		\
@@ -342,6 +343,7 @@ mntns_shared_bind02:		override CFLAGS += -DSHARED_BIND02
 maps02:		get_smaps_bits.o
 mlock_setuid:		get_smaps_bits.o
 inotify01:		override CFLAGS += -DINOTIFY01
+unlink_fstat01+:	override CFLAGS += -DUNLINK_OVER
 
 $(LIB):	force
 	$(Q) $(MAKE) -C $(LIBDIR)

test/zdtm/live/static/unlink_fstat01+.c

+unlink_fstat01.c
\ No newline at end of file

test/zdtm/live/static/unlink_fstat01.c

@@ -43,6 +43,18 @@ int main(int argc, char ** argv)
 		goto failed;
 	}
 
+#ifdef UNLINK_OVER
+{
+	int fdo;
+
+	fdo = open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0644);
+	if (fdo < 0) {
+		pr_perror("can't open %s", filename);
+		exit(1);
+	}
+}
+#endif
+
 	memset(buf, '0', sizeof(buf));
 	if (write(fd, buf, sizeof(buf)) != sizeof(buf)) {
 		pr_perror("can't write %s", filename);