diff --git a/libc/kernel/common/linux/ublock.h b/libc/kernel/common/linux/ublock.h
new file mode 100644
index 0000000..aa19a81
--- /dev/null
+++ b/libc/kernel/common/linux/ublock.h
@@ -0,0 +1,81 @@
+/****************************************************************************
+ ****************************************************************************
+ ***
+ ***   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.
+ ***
+ ****************************************************************************
+ ****************************************************************************/
+#ifndef __UBLOCK_H_
+#define __UBLOCK_H_
+
+#include <linux/types.h>
+
+#define UBLOCK_VERSION 0
+
+enum {
+ UBLOCK_INIT_IN = 0,
+ UBLOCK_INIT_OUT = 1,
+ UBLOCK_READY_IN = 2,
+ UBLOCK_READY_OUT = 3,
+ UBLOCK_READ_IN = 4,
+ UBLOCK_READ_OUT = 5,
+ UBLOCK_WRITE_IN = 6,
+ UBLOCK_WRITE_OUT = 7,
+};
+
+struct ublock_in_header {
+ __u32 seq;
+ __u32 opcode;
+};
+
+struct ublock_out_header {
+ __u32 seq;
+ __u32 opcode;
+};
+
+struct ublock_init_in {
+ __u32 version;
+ __u32 max_buf;
+ __u32 index;
+};
+
+struct ublock_init_out {
+ __u32 version;
+ __u32 max_buf;
+ __u64 size;
+};
+
+struct ublock_ready_in {
+ __u32 _unused;
+};
+
+struct ublock_ready_out {
+ __u32 _unused;
+};
+
+struct ublock_read_in {
+ __u64 offset;
+ __u64 length;
+};
+
+struct ublock_read_out {
+ __s32 status;
+ __u8 data[];
+};
+
+struct ublock_write_in {
+ __u64 offset;
+ __u64 length;
+ __u8 data[];
+};
+
+struct ublock_write_out {
+ __s32 status;
+};
+
+#endif
+