v4.19.13 snapshot.
diff --git a/include/linux/fcntl.h b/include/linux/fcntl.h
new file mode 100644
index 0000000..27dc7a6
--- /dev/null
+++ b/include/linux/fcntl.h
@@ -0,0 +1,38 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _LINUX_FCNTL_H
+#define _LINUX_FCNTL_H
+
+#include <uapi/linux/fcntl.h>
+
+/* list of all valid flags for the open/openat flags argument: */
+#define VALID_OPEN_FLAGS \
+ (O_RDONLY | O_WRONLY | O_RDWR | O_CREAT | O_EXCL | O_NOCTTY | O_TRUNC | \
+ O_APPEND | O_NDELAY | O_NONBLOCK | O_NDELAY | __O_SYNC | O_DSYNC | \
+ FASYNC | O_DIRECT | O_LARGEFILE | O_DIRECTORY | O_NOFOLLOW | \
+ O_NOATIME | O_CLOEXEC | O_PATH | __O_TMPFILE)
+
+#ifndef force_o_largefile
+#define force_o_largefile() (BITS_PER_LONG != 32)
+#endif
+
+#if BITS_PER_LONG == 32
+#define IS_GETLK32(cmd) ((cmd) == F_GETLK)
+#define IS_SETLK32(cmd) ((cmd) == F_SETLK)
+#define IS_SETLKW32(cmd) ((cmd) == F_SETLKW)
+#define IS_GETLK64(cmd) ((cmd) == F_GETLK64)
+#define IS_SETLK64(cmd) ((cmd) == F_SETLK64)
+#define IS_SETLKW64(cmd) ((cmd) == F_SETLKW64)
+#else
+#define IS_GETLK32(cmd) (0)
+#define IS_SETLK32(cmd) (0)
+#define IS_SETLKW32(cmd) (0)
+#define IS_GETLK64(cmd) ((cmd) == F_GETLK)
+#define IS_SETLK64(cmd) ((cmd) == F_SETLK)
+#define IS_SETLKW64(cmd) ((cmd) == F_SETLKW)
+#endif /* BITS_PER_LONG == 32 */
+
+#define IS_GETLK(cmd) (IS_GETLK32(cmd) || IS_GETLK64(cmd))
+#define IS_SETLK(cmd) (IS_SETLK32(cmd) || IS_SETLK64(cmd))
+#define IS_SETLKW(cmd) (IS_SETLKW32(cmd) || IS_SETLKW64(cmd))
+
+#endif