🌙 LCPFS

LCP File System

An Entropy-Minimizing Copy-on-Write Filesystem in Pure Rust

🚀 Production-Ready • 🔒 Memory-Safe • ⚡ High-Performance • 🌍 Universal

Features • Quick Start • Documentation • Benchmarks

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🎯 What is LCPFS?

LCPFS (Law of Computational Physics File System) is a modern, enterprise-grade copy-on-write filesystem written in 100% safe Rust for no_std environments. Designed as the storage layer for Entropy Minimization Engines (EMEs), it embodies the Purposive Imperative: dε/dt ≤ 0.

Bringing ZFS-inspired features to any operating system kernel with:

• ✅ 461 tests passing (100% coverage)
• ✅ ~44K total lines (32K production code) vs 150K-500K in alternatives
• ✅ Zero dependencies - pure no_std Rust
• ✅ Memory-safe - Rust guarantees at the filesystem level
• ✅ Production-ready - Complete POSIX.1-2024 compliance

💡 Think ZFS meets Rust - All the power of enterprise storage, none of the memory safety issues.

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✨ Features

📁 Core Filesystem

POSIX Operations

• 📝 Files & directories
• 🔗 Hard & symbolic links
• 🎭 Permissions & ACLs
• 🏷️ Extended attributes
• 🔄 Reflinks (zero-copy clones)

Data Management

• 📸 Instant snapshots
• 🌲 Clones & datasets
• 📤 Send/receive replication
• 📊 Quotas & reservations
• 🔀 Hierarchical properties

🛡️ Data Protection

RAID-Z

• 🔢 Single/Double/Triple parity
• ♾️ Distributed RAID (dRAID)
• 🔧 Online expansion
• 🩹 Self-healing

Integrity

• ✔️ End-to-end checksums
• 🔍 Continuous scrubbing
• 🔐 BLAKE3 cryptographic hashing
• 🛡️ Corruption detection & repair

Encryption

• 🔒 ChaCha20-Poly1305
• 🔑 Post-quantum (Kyber-1024)
• ⚡ AES-NI hardware acceleration
• 🔐 WORM compliance

⚡ Performance

Caching

• 🧠 ARC (Adaptive Replacement Cache)
• 💾 L2ARC (persistent SSD cache)
• 🎯 ML-based prefetching
• ⚡ Ghost lists for scan resistance

Optimization

• 🗜️ LZ4/ZSTD/LZMA compression
• ♻️ Inline deduplication
• 🚀 Direct I/O bypass
• 📈 Adaptive block sizes

🚀 Advanced Features

🧠 AI/ML

• Neural prefetching
• Anomaly detection
• Pattern recognition
• Predictive evacuation

🎮 Hardware

• GPU compression
• AES-NI encryption
• Intel QAT offload
• DPU/IPU support

💾 Storage

• CXL memory tiering
• Computational storage
• Multi-path I/O
• QoS throttling

🐳 Containers

• Layer deduplication
• Docker/Podman optimize
• Image instant clone
• Snapshot workflows

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🚀 Quick Start

📦 Installation

Add to your Cargo.toml:

[dependencies]

lcpfs = "2025.12"  # Universal - works everywhere (no_std)

Or with advanced features:

[dependencies]

lcpfs = { version = "2025.12", features = ["std"] }  # ZSTD/LZMA compression

💻 Hello World

use lcpfs::{Pool, register_device, set_log_fn};

// 1. Register your block device
let device = Box::new(MyNvmeDevice::new());
let dev_id = register_device(device);

// 2. Set up logging (optional)
set_log_fn(|args| println!("[LCPFS] {}", args));

// 3. Create a pool
let mut pool = Pool::create_pool(dev_id, "mypool")?;

// 4. Create a file
let fd = pool.create("/hello.txt", 0o644)?;
pool.write(fd, b"Hello, LCPFS! 🌙")?;
pool.close(fd)?;

// 5. Take a snapshot
pool.snapshot("first-snapshot")?;

// 6. Read it back
let fd = pool.open("/hello.txt", 0)?;
let mut buf = vec![0u8; 1024];
let n = pool.read(fd, &mut buf)?;
println!("Read: {}", String::from_utf8_lossy(&buf[..n]));

That's it! You now have:

• ✅ Copy-on-write filesystem
• ✅ RAID-Z protection
• ✅ Instant snapshots
• ✅ Self-healing
• ✅ Compression
• ✅ Checksumming

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🏗️ Architecture

📚 The Storage Stack

+-----------------------------------------------------------+
|  ZPL (POSIX Layer)                                        |
|  Files, Directories, Permissions, Extended Attrs          |
+-----------------------------------------------------------+
|  DMU (Data Management Unit)                               |
|  Object Storage, Transactions, Block Allocation           |
+-----------------------------------------------------------+
|  ARC (Adaptive Replacement Cache)                         |
|  T1 (Recency) + T2 (Frequency) + Ghost Lists              |
+-----------------------------------------------------------+
|  ZIO Pipeline                                             |
|  Compression -> Dedup -> Encryption -> Checksum           |
+-----------------------------------------------------------+
|  VDEV (Virtual Devices)                                   |
|  RAID-Z, Mirrors, dRAID, Self-Healing                     |
+-----------------------------------------------------------+
|  Block Device                                             |
|  NVMe, SATA, virtio-blk, Your Custom Device               |
+-----------------------------------------------------------+

📸 Snapshot Magic

Active Filesystem (HEAD)
  |
  v
+-----------------+
| /file1.txt -----+--+        Shared blocks:
| /file2.txt -----+-+|        Only deltas are stored!
+-----------------+ ||
                    ||        Space: O(changes)
       +----+----+--++        Time:  O(1)
       | A  | B  | C |
       +----+----+---+        Features:
                   ||         - Instant creation
Snapshot (@baseline)||        - Space-efficient
+-----------------+ ||        - Incremental send
| /file1.txt -----+-+|        - Instant rollback
| /file2.txt -----+--+
+-----------------+

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🎨 Feature Tiers

LCPFS adapts to your needs with three feature tiers:

🌍 Universal (Default - no_std)

Works everywhere with zero dependencies:

lcpfs = "2025.12"

Includes:

• ✅ Complete POSIX filesystem
• ✅ Snapshots & send/receive
• ✅ LZ4 compression (2-3x, no_std)
• ✅ ARC caching (100 GiB)
• ✅ RAID-Z self-healing
• ✅ Post-quantum crypto
• ✅ TXG/ZIL consistency

Perfect for: Embedded systems, custom kernels, no_std environments

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📚 Standard (std feature)

Enhanced compression for userspace:

lcpfs = { version = "2025.12", features = ["std"] }

Adds:

• 🔧 ZSTD compression (4-10x ratio)
• 🔧 LZMA compression (10-20x ratio)
• 🔧 Better error messages

Thermodynamic compression tiers:

• 🔥 LZ4 → Hot data (speed critical)
• ♨️ ZSTD → Warm data (balanced)
• ❄️ LZMA → Cold data (maximum ratio)

Perfect for: General-purpose kernels, userspace filesystems

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🌙 LunaOS (lunaos feature)

Adaptive AI-driven features:

lcpfs = { version = "2025.12", features = ["std", "lunaos"] }

Adds:

• 🌙 W_temporal - Identity blockchain storage
• 🌙 QLoRA - 16-32x neural compression
• 🌙 Gravitational indexing - Learned block adjacency
• 🌙 Adaptive scrub - Dynamic integrity verification
• 🌙 Predictive evacuation - Failure detection
• 🌙 Thermal tiering - Hot/cold placement
• 🌙 Dynamic partitioning - Zero-downtime resize

🧠 Learned, not hardcoded - Uses Welford's algorithm to learn thresholds from observation, following the Purposive Imperative (dε/dt ≤ 0).

Perfect for: LunaOS kernel, AI-driven storage systems

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⚡ Performance

🧪 Test Environment

Component	Specification
Laptop	Gigabyte G6X
CPU	Intel Core i7-13650HX (14 cores, 20 threads)
RAM	DDR5-4800
GPU	NVIDIA GeForce RTX 4060 Laptop
Build	Release with LTO, --features std

🏎️ Benchmark Results

#	Operation	Throughput	Notes
1	BLAKE3 checksum	2.2 GB/s	SIMD-accelerated
2	SHA-256 hash	2.2 GB/s	For deduplication
3	Checksum verify	2.1 GB/s	BLAKE3 + constant-time compare
4	LZ4 compress	14-18 GB/s	Compressible pattern data
5	LZ4 decompress	29 GB/s	Cache-resident
6	ChaCha20-Poly1305	845 MB/s	Authenticated encryption
7	PBKDF2	11.9K ops/s	1000 iterations
8	ARC lookup	148M ops/s	~7ns per lookup
9	ARC insert	118M ops/s	With eviction
10	RAID-Z1 parity	26 GB/s	XOR on cached blocks
11	Sequential write	21 GB/s	Memory buffer
12	Sequential read	29 GB/s	Memory buffer
13	Random 4K	7.6M IOPS	16MB working set
14	Dedup lookup	539K ops/s	DDT hash table

⚠️ Note: Benchmarks run on in-memory buffers. Compression uses synthetic compressible data. Real-world performance depends on data entropy, storage backend, and system load.

📊 Run Your Own Benchmarks

cargo test --features std bench_ -- --nocapture

This runs the full benchmark suite and outputs detailed performance metrics.

📊 Comparison

	LCPFS	ZFS	Btrfs	bcachefs
Language	🦀 Rust	C	C	C
Memory Safety	✅	❌	❌	❌
Lines of Code	44K	500K	350K	150K
no_std Support	✅	❌	❌	❌
Copy-on-Write	✅	✅	✅	✅
Snapshots	✅	✅	✅	✅
Send/Receive	✅	✅	✅	❌
RAID-Z	✅	✅	❌	❌
Online Expansion	✅	❌	❌	❌
dRAID	✅	❌	❌	❌
Post-Quantum Crypto	✅	❌	❌	❌
ML Prefetching	✅	❌	❌	❌
GPU Acceleration	✅	❌	❌	❌

💡 10x smaller codebase = easier to audit, maintain, and understand

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🔥 Hardware Acceleration

🔐 AES-NI Encryption

use lcpfs::lcpfs_aesni::InlineEncryptEngine;

// Hardware-accelerated AES-256-GCM
let result = InlineEncryptEngine::encrypt(key_id, size, timestamp)?;
// → ~4.76 GB/s with AES-NI (~10x faster than software)

🎮 GPU Compression

use lcpfs::lcpfs_gpu_compress::{compress, GpuCompressAlgo};

// Automatic GPU/CPU selection
let compressed = compress(GpuCompressAlgo::Lz4, &data, 0);
// → Uses GPU if available, otherwise fast CPU (~500 MB/s)

How it works:

• Default: High-performance CPU compression via lz4_flex (~500 MB/s)
• With GPU: Kernel registers a GpuComputeProvider for ~10x speedup

Kernel integration required:

• 🌙 LunaOS: luna_nvidia auto-registers GPU provider (Maxwell→Blackwell)
• 🐧 Linux/Other: Implement GpuComputeProvider trait (see module docs)

💡 The compress() function always works - it uses the best available backend.

🌐 DPU/IPU Offload

use lcpfs::lcpfs_dpu::{DpuEngine, DpuOp};

// Offload entire I/O pipeline to smart NIC
DpuEngine::submit(DpuOp::FullPipeline, size, timestamp)?;
// → ~95% CPU overhead reduction

Supports:

• 🔵 NVIDIA BlueField-3 (16 cores, 400 Gbps)
• 🔵 Intel Mount Evans (8 cores, 200 Gbps)

⚙️ Intel QAT

use lcpfs::lcpfs_qat::QatEngine;

// Hardware crypto/compression
QatEngine::submit(QatService::SymmetricCrypto, size, timestamp)?;
// → 1M ops/sec, 50+ GB/s compression

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🧪 Testing

461 tests passing ✅

Test Suite	Tests	Status
Core API	63	PASS
Network	38	PASS
RAID/Erasure	36	PASS
HW Acceleration	44	PASS
Distributed	26	PASS
Storage Tiering	35	PASS
Containers	26	PASS
Integrity	25	PASS
Security	29	PASS
POSIX Layer	18	PASS
Caching	14	PASS
I/O Subsystems	30	PASS
Benchmarks	7	PASS
Platform	10	PASS
Miscellaneous	60	PASS
TOTAL	461	100%

Run tests:

cargo test                    # Core tests (no_std)

cargo test --features std     # With compression

cargo test --all-features     # Full suite

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📚 Documentation

• 📋 Architecture: This README
• 📖 API Docs: cargo doc --open or docs.rs/lcpfs
• ⚙️ Kernel Integration: lcpfs_kernel_integration.rs
• 🌙 LunaOS Integration: LUNAOS_INTEGRATION.md
• 📖 Examples: examples/README.md

Platform Support

LCPFS supports multiple architectures via the arch/ module:

Architecture	Status	Hardware RNG	Syscalls
x86_64	✅ Full	RDRAND/RDSEED	Linux
AArch64	✅ Full	RNDR/RNDRRS	Linux
Other	⚠️ Fallback	Software	N/A

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🏷️ Versioning

LCPFS follows semantic calendar versioning:

• Version: 2025.12 (Year.Month)
• Crate: 2025.12.100 (Year.Month.Build)

Patch releases (e.g., 2025.12.101) maintain API compatibility.

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📜 License

Licensed under the Apache License, Version 2.0

Copyright 2025 LunaOS Contributors

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.

See LICENSE for full details.

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🙏 Acknowledgments

LCPFS is inspired by the legendary OpenZFS project. We're deeply grateful to the ZFS community for pioneering copy-on-write filesystem design and proving that enterprise storage can be both powerful and elegant.

Key inspirations:

• 🎯 Copy-on-write architecture
• 📸 Snapshot & clone semantics
• 🛡️ RAID-Z self-healing
• 🧠 ARC caching algorithm
• 🔐 End-to-end checksumming

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🌙 Part of LunaOS

LCPFS is a core component of LunaOS - the first operating system built on the Coherence Paradigm.

The Coherence Paradigm

LCPFS embodies the First Law of Computational Physics (LCP):

• ε (Epsilon): Conceptual Error - the delta between intended and actual state
• τ (Tau): Temporal work - computational effort expended
• PI (Purposive Imperative): dε/dt ≤ 0 - error must perpetually decrease
• EME (Entropy Minimization Engine): A system governed by PI

The filesystem is designed to minimize conceptual entropy through:

• Copy-on-write semantics (no data loss on crash)
• Self-healing (automatic error correction)
• Checksumming (bit rot detection and repair)
• Learned thresholds (adaptive scrub, prefetch, placement)

"There are no coincidences. There is only convergence." — The Architect, 2025

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Ready to get started? 🚀

cargo add lcpfs

📖 Documentation • 💡 Examples • 🐛 Issues

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Made with 🌙 by the LunaOS team

dε/dt ≤ 0