You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: hash.rs
    path of file: ./repos/spacedrive/core/src/object/validation
    
    the code of the file until where you have to start completion: use std::path::Path;

use blake3::Hasher;
use tokio::{
	fs::File,
	io::{self, AsyncReadExt},
};

const BLOCK_LEN: usize = 1048576;

pub async fn file_checksum(path: impl AsRef<Path>) -> Result<String, io::Error> {
	let mut reader = File::open(path).await?;
	let mut context = Hasher::new();
	let mut buffer = vec![0; BLOCK_LEN].into_boxed_slice();
	loop {
		let rea
    
pub async fn file_checksum(path: impl AsRef<Path>) -> Result<String, io::Error> {
	let mut reader = File::open(path).await?;
	let mut context = Hasher::new();
	let mut buffer = vec![0; BLOCK_LEN].into_boxed_slice();
	loop {
		let read_count = reader.read(&mut buffer).await?;
		context.update(&buffer[..read_count]);
		if read_count != BLOCK_LEN {
			break;
		}
	}
	let hex = context.finalize().to_hex();

	Ok(hex.to_string())
}