Import <linux/blk-crypto.h>

Import <linux/blk-crypto.h> from Linux v6.16.

Needed for the definition of the blk-crypto ioctls.

Author: ebiggers

Makefile

@@ -67,8 +67,8 @@ fscryptctl.1: fscryptctl.1.md
 
 ##############################################################################
 
-# Don't format fscrypt_uapi.h, so that it stays identical to the kernel version.
-FILES_TO_FORMAT := $(filter-out fscrypt_uapi.h, $(SRC) $(HDRS))
+# Don't format UAPI files.  They should stay identical to the kernel's copies.
+FILES_TO_FORMAT := $(filter-out %_uapi.h, $(SRC) $(HDRS))
 
 .PHONY: format format-check
 format:

blk-crypto_uapi.h

@@ -0,0 +1,44 @@
+/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
+#ifndef _UAPI_LINUX_BLK_CRYPTO_H
+#define _UAPI_LINUX_BLK_CRYPTO_H
+
+#include <linux/ioctl.h>
+#include <linux/types.h>
+
+struct blk_crypto_import_key_arg {
+	/* Raw key (input) */
+	__u64 raw_key_ptr;
+	__u64 raw_key_size;
+	/* Long-term wrapped key blob (output) */
+	__u64 lt_key_ptr;
+	__u64 lt_key_size;
+	__u64 reserved[4];
+};
+
+struct blk_crypto_generate_key_arg {
+	/* Long-term wrapped key blob (output) */
+	__u64 lt_key_ptr;
+	__u64 lt_key_size;
+	__u64 reserved[4];
+};
+
+struct blk_crypto_prepare_key_arg {
+	/* Long-term wrapped key blob (input) */
+	__u64 lt_key_ptr;
+	__u64 lt_key_size;
+	/* Ephemerally-wrapped key blob (output) */
+	__u64 eph_key_ptr;
+	__u64 eph_key_size;
+	__u64 reserved[4];
+};
+
+/*
+ * These ioctls share the block device ioctl space; see uapi/linux/fs.h.
+ * 140-141 are reserved for future blk-crypto ioctls; any more than that would
+ * require an additional allocation from the block device ioctl space.
+ */
+#define BLKCRYPTOIMPORTKEY _IOWR(0x12, 137, struct blk_crypto_import_key_arg)
+#define BLKCRYPTOGENERATEKEY _IOWR(0x12, 138, struct blk_crypto_generate_key_arg)
+#define BLKCRYPTOPREPAREKEY _IOWR(0x12, 139, struct blk_crypto_prepare_key_arg)
+
+#endif /* _UAPI_LINUX_BLK_CRYPTO_H */