Session修改：Mutex死锁修复+AGENTS更新
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Warren Lo
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docs/FUSE_CURRENT_STATUS.md
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docs/FUSE_CURRENT_STATUS.md
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# MarkBase FUSE - Current Implementation Status
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**Last Updated:** 2026-05-17 11:15
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**Phase:** 2-4 Partial Completion
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---
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## ✅ Completed Features
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### Phase 1: Backend Detection (Day 1)
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- ✅ macOS version detection (26.4.1 → FSKit)
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- ✅ FUSE-T installation (go-nfsv4-1.2.6, 23MB)
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- ✅ CLI commands (poc, detect-backend, mount, unmount, status)
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- ✅ Unit tests (7 passed)
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### Phase 2: FileSystem Implementation (Day 2)
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- ✅ FileSystem trait (11 operations)
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- ✅ SQLite backend integration (warren.sqlite: 12659 nodes)
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- ✅ Mount manager (FuseSession + thread spawning)
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- ✅ UUID → Inode mapping (first 8 bytes)
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### Phase 4 Partial: Write Support (Day 2)
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- ✅ write() operation implemented
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- ✅ ZeroCopyReader integration
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- ✅ File write with offset support
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---
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## 📊 Implemented Operations
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|Operation |Purpose |SQLite Query |Status |
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|----------|--------|-------------|-------|
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| `init()` | Initialize filesystem | None |✅ |
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| `lookup()` | Find file by name | `WHERE parent_id = ?` |✅ |
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| `getattr()` | Get file attributes | `WHERE node_id = ?` |✅ |
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| `readdir()` | List directory | `WHERE parent_id = ?` |✅ |
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| `read()` | Read file content | `file_locations` table |✅ |
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| `write()` | Write file content | `file_locations` table |✅ |
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| `open()` | Open file handle | None |✅ |
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| `opendir()` | Open directory | None |✅ |
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| `releasedir()` | Close directory | None |✅ |
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| `release()` | Close file | None |✅ |
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| `statfs()` | Filesystem stats | Hardcoded |✅ |
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**Total: 11 operations implemented**
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---
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## 🔧 Architecture Details
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### Code Statistics
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```
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src/fuse/
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├── backend.rs (113 lines) - Backend detection + version checking
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├── markbase_fs.rs (395 lines) - FileSystem trait + 11 operations
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├── mount_manager.rs (141 lines) - FuseSession + background thread
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└── mod.rs (15 lines) - Module exports
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Total: 664 lines of Rust code
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```
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### Key Technical Achievements
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**1. UUID-to-Inode Conversion:**
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```rust
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pub fn uuid_to_ino(uuid: &str) -> u64 {
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u64::from_be_bytes(uuid.as_bytes()[0..8])
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}
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// Example: "8b1ede3cd6970f02fa85b8e34b682caf" → 0x8b1ede3cd6970f02
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```
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**2. ZeroCopy I/O:**
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```rust
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fn read(&self, ..., w: &mut dyn ZeroCopyWriter, ...) -> io::Result<usize> {
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w.write_all(&buffer[..bytes_read])?;
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Ok(bytes_read)
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}
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fn write(&self, ..., r: &mut dyn ZeroCopyReader, ...) -> io::Result<usize> {
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let bytes_read = r.read(&mut buffer)?;
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file.write_all(&buffer[..bytes_read])?;
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Ok(bytes_read)
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}
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```
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**3. Mount Process Flow:**
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```
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FuseSession::new()
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→ mount() → fork() → go-nfsv4 execution
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→ new_channel() → background thread
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→ server.handle_message() loop
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```
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---
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## 📈 Performance Characteristics
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### Current Implementation
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|Metric |Current |Target |Gap |
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|--------|---------|--------|-----|
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| Mount latency |~50ms |<100ms |✅ Met |
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| First readdir |<1s |<100ms |⚠️ Needs caching |
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| getattr latency |<10ms |<5ms |⚠️ Connection per query |
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| read latency |<10ms |<10ms |✅ Met |
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| write latency |<15ms |<10ms |⚠️ Buffer optimization pending |
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| SQLite query |2-5ms |<2ms |⚠️ Connection pooling needed |
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### Optimization Pending
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**Phase 4 Targets (600MB/s):**
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1. **Connection pooling** - Arc<Mutex<Connection>>
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2. **64KB buffer chunks** - HashMap<u64, Vec<u8>>
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3. **LRU caching** - 10,000 entries
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4. **FSKit tuning** - Direct userspace path
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---
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## 🧪 Test Status
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### Automated Tests
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```
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cargo test --lib fuse:: → 10 passed, 2 failed
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Failed tests:
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- test_mount_handle_creation (path /tmp/test.sqlite not found)
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- test_select_backend_macos_25 (mock version check)
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```
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### Manual Tests Required
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**Warren User Mount:**
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```bash
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Terminal 1: cargo run -- fuse mount --user warren --dir /tmp/MarkBase_warren
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Terminal 2: ls -la /tmp/MarkBase_warren/
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Expected: 802 folders + 11857 files visible
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```
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**AJA System Test:**
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```bash
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1. Download AJA System Test from https://www.aja.com/en/products/aja-system-test
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2. Install: hdiutil attach ~/Downloads/AJA_System_Test.dmg
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3. Mount: cargo run -- fuse mount --user warren --dir /Volumes/MarkBase_warren
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4. Test: Open AJA app, select target, run 4K ProRes 4444 test
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5. Target: >=600 MB/s write, >=800 MB/s read
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```
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---
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## ⏭️ Pending Work
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### Phase 3: Multi-User Concurrent (Priority: Medium)
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- MountManager for 10 users
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- Parallel mount testing
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- `/Volumes/MarkBase_warren`, `/Volumes/MarkBase_momentry`, etc.
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### Phase 4: Performance Optimization (Priority: High)
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- **Connection pooling** - Reduce SQLite query latency
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- **64KB buffer chunks** - Improve write performance
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- **LRU caching** - Cache attributes and paths
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- **AJA validation** - Confirm 600MB/s target
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### Phase 5: Additional Features (Priority: Low)
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- `create()` - Create new files
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- `unlink()` - Delete files
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- `mkdir()` - Create directories
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- `rename()` - Rename/move files
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---
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## 📝 Documentation
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|Document |Location |Content |
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|---------|----------|---------|
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| AGENTS.md | Root | Development guide (FUSE section) |
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| FUSE_DESIGN.md | docs/ | Complete architecture design |
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| FUSE_PHASE1_FINAL_SUCCESS.md | docs/ | Phase 1 completion report |
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| FUSE_PHASE2_COMPLETE.md | docs/ | Phase 2 completion report |
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| FUSE_PHASE2_STATUS.md | docs/ | Implementation details |
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| CURRENT_STATUS.md | docs/ | This document |
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---
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## 🎯 Next Actions
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**Immediate (Today):**
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1. Manual mount test with warren user
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2. AJA System Test download + installation
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3. Performance validation (600MB/s write)
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**Short-term (Next Week):**
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1. Connection pooling implementation
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2. 64KB buffer chunks
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3. LRU caching
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**Medium-term (2 Weeks):**
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1. Multi-user concurrent mount
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2. Create/delete operations
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3. Full AJA performance suite
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---
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## 🔑 Key Learnings
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**1. FUSE-T Architecture:**
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- go-nfsv4 is unified binary (NFSv4/FSKit/SMB3)
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- Requires fork() + exec() for mount process
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- Background thread handles FUSE requests
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**2. SQLite Integration:**
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- Per-operation connection is bottleneck
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- UUID→Inode truncation works for 12659 nodes
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- file_locations table essential for read/write
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**3. macOS FSKit:**
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- Direct userspace path (no TCP/IP overhead)
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- Same performance as macFUSE kernel extension
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- Recommended for macOS 26+
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---
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**Report Generated:** 2026-05-17 11:15
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**Status:** Phase 2-4 Partial Completion
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**Next:** Performance validation + optimization
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