AI Dev Tool: BtrfsZFSbcachefs under workloads classic

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Preview Code

```rust
//! AI Dev Tool: Edge Function File System Benchmark
//!
//! This code provides a production-ready developer asset for benchmarking file systems under various workloads.
//! It utilizes the Rust programming language and WebAssembly for edge function deployment.
//!
//! Supported file systems: Btrfs, ZFS, bcachefs

use std::fs;
use std::path::Path;
use std::time::Instant;
use wasm_bindgen::prelude::*;

// Define a struct to hold benchmark results
#[derive(Debug, Serialize, Deserialize)]
struct BenchmarkResult {
    file_system: String,
    write_speed: f64,
    read_speed: f64,
}

// Define an enum for supported file systems
#[derive(Debug, Serialize, Deserialize)]
enum FileSystem {
    Btrfs,
# ... full runnable version includes tests & documentation