Move the files and rename some functions.

- Rename dir.go as 'fs-multipart-dir.go'
- Move the push/pop to fs-multipart.go and rename them as save/lookup.
- Rename objectInfo instances in fs-multipart as multipartObjInfo.

fs.go

@@ -50,43 +50,6 @@ type Filesystem struct {
 	listMultipartObjectMapMutex *sync.Mutex
 }
 
-func (fs *Filesystem) pushListMultipartObjectCh(params listMultipartObjectParams, ch multipartObjectInfoChannel) {
-	fs.listMultipartObjectMapMutex.Lock()
-	defer fs.listMultipartObjectMapMutex.Unlock()
-
-	channels := []multipartObjectInfoChannel{ch}
-	if _, ok := fs.listMultipartObjectMap[params]; ok {
-		channels = append(fs.listMultipartObjectMap[params], ch)
-	}
-
-	fs.listMultipartObjectMap[params] = channels
-}
-
-func (fs *Filesystem) popListMultipartObjectCh(params listMultipartObjectParams) *multipartObjectInfoChannel {
-	fs.listMultipartObjectMapMutex.Lock()
-	defer fs.listMultipartObjectMapMutex.Unlock()
-
-	if channels, ok := fs.listMultipartObjectMap[params]; ok {
-		for i, channel := range channels {
-			if !channel.IsTimedOut() {
-				chs := channels[i+1:]
-				if len(chs) > 0 {
-					fs.listMultipartObjectMap[params] = chs
-				} else {
-					delete(fs.listMultipartObjectMap, params)
-				}
-
-				return &channel
-			}
-		}
-
-		// As all channels are timed out, delete the map entry
-		delete(fs.listMultipartObjectMap, params)
-	}
-
-	return nil
-}
-
 // newFS instantiate a new filesystem.
 func newFS(rootPath string) (ObjectAPI, *probe.Error) {
 	fs := &Filesystem{