Method initWriteBufferWithLock

vfs.go:2097–2112

initWriteBufferWithLock initializes the write buffer file for durability. Any existing buffer content is discarded since unsync'd changes are lost on restart. Caller must hold f.mu.

()

// Any existing buffer content is discarded since unsync'd changes are lost on restart.
// Caller must hold f.mu.
func (f *VFSFile) initWriteBufferWithLock() error {
	// Ensure parent directory exists
	if err := os.MkdirAll(filepath.Dir(f.bufferPath), 0755); err != nil {
		return fmt.Errorf("create buffer directory: %w", err)
	}

	// Open or create buffer file, truncating any existing content
	file, err := os.OpenFile(f.bufferPath, os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0644)
	if err != nil {
		return fmt.Errorf("open buffer file: %w", err)
	}
	f.bufferFile = file
	f.bufferNextOff = 0

	return nil
}

// writeToBuffer writes a dirty page to the write buffer for durability.
// If the page already exists in the buffer, it overwrites at the same offset.