diff --git a/fsverity/libfsverity_rs/sys.rs b/fsverity/libfsverity_rs/sys.rs
new file mode 100644
index 0000000..8ce0836
--- /dev/null
+++ b/fsverity/libfsverity_rs/sys.rs
@@ -0,0 +1,58 @@
+/*
+ * Copyright (C) 2023 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+//! Stable API definition copied from uapi/linux/fsverity.h
+
+use nix::{ioctl_readwrite, ioctl_write_ptr};
+
+const FS_IOCTL_MAGIC: u8 = b'f';
+const FS_IOC_ENABLE_VERITY: u8 = 133;
+const FS_IOCTL_READ_VERITY_METADATA: u8 = 135;
+
+pub const FS_VERITY_HASH_ALG_SHA256: u32 = 1;
+pub const FS_VERITY_METADATA_TYPE_MERKLE_TREE: u64 = 1;
+pub const FS_VERITY_METADATA_TYPE_SIGNATURE: u64 = 3;
+
+#[repr(C)]
+pub struct fsverity_read_metadata_arg {
+    pub metadata_type: u64,
+    pub offset: u64,
+    pub length: u64,
+    pub buf_ptr: u64,
+    pub __reserved: u64,
+}
+
+ioctl_readwrite!(
+    read_verity_metadata,
+    FS_IOCTL_MAGIC,
+    FS_IOCTL_READ_VERITY_METADATA,
+    fsverity_read_metadata_arg
+);
+
+#[repr(C)]
+pub struct fsverity_enable_arg {
+    pub version: u32,
+    pub hash_algorithm: u32,
+    pub block_size: u32,
+    pub salt_size: u32,
+    pub salt_ptr: u64,
+    pub sig_size: u32,
+    pub __reserved1: u32,
+    pub sig_ptr: u64,
+    pub __reserved2: [u64; 11],
+}
+
+ioctl_write_ptr!(enable_verity, FS_IOCTL_MAGIC, FS_IOC_ENABLE_VERITY, fsverity_enable_arg);