diff --git a/libc/kernel/uapi/linux/cachefiles.h b/libc/kernel/uapi/linux/cachefiles.h
new file mode 100644
index 0000000..f5a58a5
--- /dev/null
+++ b/libc/kernel/uapi/linux/cachefiles.h
@@ -0,0 +1,48 @@
+/****************************************************************************
+ ****************************************************************************
+ ***
+ ***   This header was automatically generated from a Linux kernel header
+ ***   of the same name, to make information necessary for userspace to
+ ***   call into the kernel available to libc.  It contains only constants,
+ ***   structures, and macros generated from the original header, and thus,
+ ***   contains no copyrightable information.
+ ***
+ ***   To edit the content of this header, modify the corresponding
+ ***   source file (e.g. under external/kernel-headers/original/) then
+ ***   run bionic/libc/kernel/tools/update_all.py
+ ***
+ ***   Any manual change here will be lost the next time this script will
+ ***   be run. You've been warned!
+ ***
+ ****************************************************************************
+ ****************************************************************************/
+#ifndef _LINUX_CACHEFILES_H
+#define _LINUX_CACHEFILES_H
+#include <linux/types.h>
+#include <linux/ioctl.h>
+#define CACHEFILES_MSG_MAX_SIZE 1024
+enum cachefiles_opcode {
+  CACHEFILES_OP_OPEN,
+  CACHEFILES_OP_CLOSE,
+  CACHEFILES_OP_READ,
+};
+struct cachefiles_msg {
+  __u32 msg_id;
+  __u32 opcode;
+  __u32 len;
+  __u32 object_id;
+  __u8 data[];
+};
+struct cachefiles_open {
+  __u32 volume_key_size;
+  __u32 cookie_key_size;
+  __u32 fd;
+  __u32 flags;
+  __u8 data[];
+};
+struct cachefiles_read {
+  __u64 off;
+  __u64 len;
+};
+#define CACHEFILES_IOC_READ_COMPLETE _IOW(0x98, 1, int)
+#endif