revert 30e804709f

revert Enhance FileInfo structure and DiskFS functionality

- Added CTime (creation time) and AccessCount fields to FileInfo struct for better file metadata tracking.
- Updated NewFileInfo and NewFileInfoFromOS functions to initialize new fields.
- Enhanced DiskFS to maintain access counts and file metadata, including flushing to JSON files.
- Modified Open and Create methods to increment access counts and set creation times appropriately.
- Updated garbage collection logic to utilize real access counts for files.

vfs/memory/memory.go

@@ -149,6 +149,15 @@ func (m *MemoryFS) getKeyLock(key string) *sync.RWMutex {
 }
 
 func (m *MemoryFS) Create(key string, size int64) (io.WriteCloser, error) {
+	m.mu.RLock()
+	if m.capacity > 0 {
+		if m.size+size > m.capacity {
+			m.mu.RUnlock()
+			return nil, vfserror.ErrDiskFull
+		}
+	}
+	m.mu.RUnlock()
+
 	keyMu := m.getKeyLock(key)
 	keyMu.Lock()
 	defer keyMu.Unlock()
@@ -160,19 +169,18 @@ func (m *MemoryFS) Create(key string, size int64) (io.WriteCloser, error) {
 		onClose: func() error {
 			data := buf.Bytes()
 			m.mu.Lock()
-			defer m.mu.Unlock()
 			if f, exists := m.files[key]; exists {
 				m.size -= int64(len(f.data))
 				m.LRU.Remove(key)
 			}
 			fi := vfs.NewFileInfo(key, int64(len(data)), time.Now())
-			fi.CTime = time.Now() // Set creation time
 			m.files[key] = &file{
-				data:     data,
 				fileinfo: fi,
+				data:     data,
 			}
 			m.LRU.Add(key, fi)
 			m.size += int64(len(data))
+			m.mu.Unlock()
 
 			memoryWriteBytes.Add(float64(len(data)))
 			memorySizeBytes.Set(float64(m.Size()))
@@ -224,7 +232,6 @@ func (m *MemoryFS) Open(key string) (io.ReadCloser, error) {
 		return nil, vfserror.ErrNotFound
 	}
 	f.fileinfo.ATime = time.Now()
-	f.fileinfo.AccessCount++ // Increment access count
 	m.LRU.MoveToFront(key)
 	dataCopy := make([]byte, len(f.data))
 	copy(dataCopy, f.data)