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diff --git a/test/fuse_integration/POSIX_IMPLEMENTATION_ROADMAP.md b/test/fuse_integration/POSIX_IMPLEMENTATION_ROADMAP.md new file mode 100644 index 000000000..59d6430e8 --- /dev/null +++ b/test/fuse_integration/POSIX_IMPLEMENTATION_ROADMAP.md @@ -0,0 +1,271 @@ +# POSIX Compliance Implementation Roadmap + +This document tracks the implementation status of POSIX features in the SeaweedFS FUSE mount compliance test suite and provides a roadmap for completing comprehensive POSIX compliance testing. + +## Overview + +The POSIX compliance test suite currently has several tests that are skipped due to requiring platform-specific implementations. This roadmap outlines the steps needed to implement these tests and achieve comprehensive POSIX compliance validation. + +## Current Status + +### ✅ Implemented Features +- Basic file operations (create, read, write, delete) +- Directory operations (mkdir, rmdir, rename) +- File permissions and ownership +- Symbolic and hard links +- Basic I/O operations (seek, append, positioned I/O) +- File descriptors and atomic operations +- Concurrent access patterns +- Error handling compliance +- Timestamp operations + +### 🚧 Partially Implemented +- Cross-platform compatibility (basic implementation with platform-specific access time handling) + +### ❌ Missing Implementations + +#### 1. Extended Attributes (xattr) +**Priority: High** +**Platforms: Linux, macOS, FreeBSD** + +**Current Status:** All xattr tests are skipped +- `TestExtendedAttributes/SetExtendedAttribute` +- `TestExtendedAttributes/ListExtendedAttributes` +- `TestExtendedAttributes/RemoveExtendedAttribute` + +**Implementation Plan:** +```go +// Linux implementation +//go:build linux +func setXattr(path, name string, value []byte) error { + return syscall.Setxattr(path, name, value, 0) +} + +// macOS implementation +//go:build darwin +func setXattr(path, name string, value []byte) error { + return syscall.Setxattr(path, name, value, 0, 0) +} +``` + +**Required Files:** +- `xattr_linux.go` - Linux syscall implementations +- `xattr_darwin.go` - macOS syscall implementations +- `xattr_freebsd.go` - FreeBSD syscall implementations +- `xattr_unsupported.go` - Fallback for unsupported platforms + +#### 2. Memory Mapping (mmap) +**Priority: High** +**Platforms: All POSIX systems** + +**Current Status:** All mmap tests are skipped +- `TestMemoryMapping/MemoryMappedRead` +- `TestMemoryMapping/MemoryMappedWrite` + +**Implementation Plan:** +```go +func testMmap(t *testing.T, filePath string) { + fd, err := syscall.Open(filePath, syscall.O_RDWR, 0) + require.NoError(t, err) + defer syscall.Close(fd) + + // Platform-specific mmap implementation + data, err := syscall.Mmap(fd, 0, size, syscall.PROT_READ|syscall.PROT_WRITE, syscall.MAP_SHARED) + require.NoError(t, err) + defer syscall.Munmap(data) +} +``` + +**Required Files:** +- `mmap_unix.go` - Unix-like systems implementation +- `mmap_windows.go` - Windows implementation (if needed) + +#### 3. Vectored I/O (readv/writev) +**Priority: Medium** +**Platforms: All POSIX systems** + +**Current Status:** Vectored I/O test is skipped +- `TestAdvancedIO/VectoredIO` + +**Implementation Plan:** +```go +func testVectoredIO(t *testing.T, filePath string) { + // Use syscall.Syscall for readv/writev + // Linux: SYS_READV, SYS_WRITEV + // Other platforms: platform-specific syscall numbers +} +``` + +#### 4. Direct I/O +**Priority: Medium** +**Platforms: Linux, some Unix variants** + +**Current Status:** Direct I/O test is skipped +- `TestDirectIO/DirectIO` + +**Implementation Plan:** +```go +//go:build linux +func testDirectIO(t *testing.T, filePath string) { + fd, err := syscall.Open(filePath, syscall.O_RDWR|syscall.O_DIRECT, 0) + // Test with aligned buffers +} +``` + +#### 5. File Preallocation (fallocate) +**Priority: Medium** +**Platforms: Linux, some Unix variants** + +**Current Status:** fallocate test is skipped +- `TestFilePreallocation/Fallocate` + +**Implementation Plan:** +```go +//go:build linux +func testFallocate(t *testing.T, filePath string) { + fd, err := syscall.Open(filePath, syscall.O_RDWR, 0) + err = syscall.Syscall6(syscall.SYS_FALLOCATE, uintptr(fd), 0, 0, uintptr(size), 0, 0) +} +``` + +#### 6. Zero-Copy Transfer (sendfile) +**Priority: Low** +**Platforms: Linux, FreeBSD, some Unix variants** + +**Current Status:** sendfile test is skipped +- `TestZeroCopyTransfer/Sendfile` + +**Implementation Plan:** +```go +//go:build linux +func testSendfile(t *testing.T, srcPath, dstPath string) { + // Use syscall.Syscall for sendfile + // Platform-specific implementations +} +``` + +#### 7. File Sealing (Linux-specific) +**Priority: Low** +**Platforms: Linux only** + +**Current Status:** File sealing test is skipped +- `TestFileSealing` + +**Implementation Plan:** +```go +//go:build linux +func testFileSealing(t *testing.T) { + // Use fcntl with F_ADD_SEALS, F_GET_SEALS + // Test various seal types: F_SEAL_WRITE, F_SEAL_SHRINK, etc. +} +``` + +## Implementation Strategy + +### Phase 1: Core Features (High Priority) +1. **Extended Attributes** - Essential for many applications +2. **Memory Mapping** - Critical for performance-sensitive applications + +### Phase 2: Advanced I/O (Medium Priority) +3. **Vectored I/O** - Important for efficient bulk operations +4. **Direct I/O** - Needed for database and high-performance applications +5. **File Preallocation** - Important for preventing fragmentation + +### Phase 3: Specialized Features (Low Priority) +6. **Zero-Copy Transfer** - Performance optimization feature +7. **File Sealing** - Security feature, Linux-specific + +## Platform Support Matrix + +| Feature | Linux | macOS | FreeBSD | Windows | Notes | +|---------|-------|-------|---------|---------|-------| +| Extended Attributes | ✅ | ✅ | ✅ | ❌ | Different syscall signatures | +| Memory Mapping | ✅ | ✅ | ✅ | ✅ | Standard POSIX | +| Vectored I/O | ✅ | ✅ | ✅ | ❌ | readv/writev syscalls | +| Direct I/O | ✅ | ❌ | ✅ | ❌ | O_DIRECT flag | +| fallocate | ✅ | ❌ | ❌ | ❌ | Linux-specific | +| sendfile | ✅ | ❌ | ✅ | ❌ | Platform-specific | +| File Sealing | ✅ | ❌ | ❌ | ❌ | Linux-only | + +## Development Guidelines + +### 1. Platform-Specific Implementation Pattern +```go +// feature_linux.go +//go:build linux +package fuse +func platformSpecificFunction() { /* Linux implementation */ } + +// feature_darwin.go +//go:build darwin +package fuse +func platformSpecificFunction() { /* macOS implementation */ } + +// feature_unsupported.go +//go:build !linux && !darwin +package fuse +func platformSpecificFunction() { /* Skip or error */ } +``` + +### 2. Test Structure Pattern +```go +func (s *POSIXExtendedTestSuite) TestFeature(t *testing.T) { + if !isFeatureSupported() { + t.Skip("Feature not supported on this platform") + return + } + + t.Run("FeatureTest", func(t *testing.T) { + // Actual test implementation + }) +} +``` + +### 3. Error Handling +- Use platform-specific error checking +- Provide meaningful error messages +- Gracefully handle unsupported features + +## Testing Strategy + +### 1. Continuous Integration +- Run tests on multiple platforms (Linux, macOS) +- Use build tags to enable/disable platform-specific tests +- Ensure graceful degradation on unsupported platforms + +### 2. Feature Detection +- Implement runtime feature detection where possible +- Skip tests gracefully when features are unavailable +- Log clear messages about skipped functionality + +### 3. Documentation +- Document platform-specific behavior +- Provide examples for each implemented feature +- Maintain compatibility matrices + +## Contributing + +When implementing these features: + +1. **Start with high-priority items** (Extended Attributes, Memory Mapping) +2. **Follow the platform-specific pattern** outlined above +3. **Add comprehensive tests** for each feature +4. **Update this roadmap** as features are implemented +5. **Document any platform-specific quirks** or limitations + +## Future Enhancements + +Beyond the current roadmap, consider: +- **File locking** (flock, fcntl locks) +- **Asynchronous I/O** (aio_read, aio_write) +- **File change notifications** (inotify, kqueue) +- **POSIX ACLs** (Access Control Lists) +- **Sparse file operations** +- **File hole punching** + +## References + +- [POSIX.1-2017 Standard](https://pubs.opengroup.org/onlinepubs/9699919799/) +- [Linux Programmer's Manual](https://man7.org/linux/man-pages/) +- [FreeBSD System Calls](https://www.freebsd.org/cgi/man.cgi) +- [macOS System Calls](https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/) |