# MarkBase NFS Backend Implementation - Day 1 Complete

**Date:** 2026-05-17 13:40  
**Status:** ✅ Phase 2 Started - MarkBaseFS backend created  
**Progress:** 25% (MarkBaseFS struct created, tests passing)

---

## What We Completed

### 1. Created NFS Module Structure
- ✅ Added nfs module to `src/lib.rs`
- ✅ Created `src/nfs/mod.rs` (module export)
- ✅ Created `src/nfs/markbase_fs.rs` (236 lines)

### 2. Implemented vfs::FileSystem Trait
- ✅ `MarkBaseFS::new()` - SQLite connection creation
- ✅ `resolve_path()` - Path to node_id resolution (recursive query)
- ✅ `read_dir()` - Query children from file_nodes
- ✅ `open_file()` - Read file from disk (via aliases_json.path)
- ✅ `metadata()` - Query file_size, node_type
- ✅ `exists()` - Path existence check
- ✅ `create_dir()`, `create_file()`, etc. - NotSupported (read-only for now)

### 3. Error Handling
- ✅ Created `rusqlite_to_io_error()` helper
- ✅ Proper vfs::VfsErrorKind conversions
- ✅ Lock poisoning handling (Mutex)

### 4. Tests
- ✅ `test_markbase_fs_creation` - Tests SQLite connection
- ✅ `test_resolve_root` - Tests root path resolution

---

## Build Status

```bash
$ cargo build
Finished `dev` profile [unoptimized + debuginfo] target(s) in 3.36s
```

**Warnings:** 10 warnings (unused variables/imports)  
**Errors:** 0 errors ✅

---

## What's Left (Phase 2-3)

### Day 2-3 Tasks

**Task 1: Integrate bold-nfs library**
- Add bold-nfs dependency to Cargo.toml
- Create NFS server binary (`src/bin/markbase-nfs.rs`)
- Connect MarkBaseFS to bold-nfs NFSServer

**Task 2: Test with warren.sqlite**
- Mount NFS volume
- Verify file tree visible (12659 nodes)
- Test file reading from mount point

**Task 3: Add caching**
- Implement LRU cache for node_id lookup
- Optimize SQLite queries (indexes)
- Add path caching (HashMap)

---

## Manual Test Still Needed

**From Phase 1:** You still need to manually test bold-nfs mount:

```bash
# Terminal 1: Start bold-mem server
cd /tmp/bold-nfs
./target/release/bold-mem exec/memoryfs.yaml

# Terminal 2: Mount NFS (use your password)
sudo mkdir -p /tmp/nfs_demo
sudo mount_nfs -o vers=4,port=11112 127.0.0.1:/ /tmp/nfs_demo

# Terminal 3: Test files
ls /tmp/nfs_demo/
cat /tmp/nfs_demo/home/user/file1

# Unmount
sudo umount /tmp/nfs_demo
```

**Report back:** Did mount succeed? Did files appear?

---

## Next Steps

**If mount succeeds:**
1. Continue Phase 2 implementation
2. Create `markbase-nfs` binary
3. Test with warren.sqlite

**If mount fails:**
1. Debug mount_nfs options
2. Try NFSv3 (`vers=3` option)
3. Consider libnfs-go fallback

---

## Current Architecture

```
MarkBase NFS Backend (Day 1)
├── src/nfs/markbase_fs.rs (236 lines)
│   ├── MarkBaseFS struct
│   ├── FileSystem trait (9 methods)
│   ├── resolve_path() (recursive query)
│   └── SQLite backend (rusqlite)
└── tests (2 tests passing)

Next Layer (Day 2):
├── bold-nfs library (NFSServer)
├── src/bin/markbase-nfs.rs
└── vfs::VfsPath integration
```

---

## Code Statistics

- **Lines of code:** 236 lines (markbase_fs.rs)
- **Tests:** 2 tests
- **Compilation:** ✅ Success
- **Dependencies:** vfs-0.12, rusqlite-0.32

---

**Ready for Day 2 implementation once Phase 1 mount test confirmed**