Add an End-to-End workflow for FUSE mount (#3562)

* Add an e2e workflow to test FUSE mount

* Fix deadlocks during concurrent r/w

weed/mount/filehandle.go

@@ -77,6 +77,10 @@ func (fh *FileHandle) AddChunks(chunks []*filer_pb.FileChunk) {
 	fh.entryLock.Lock()
 	defer fh.entryLock.Unlock()
 
+	if fh.entry == nil {
+		return
+	}
+
 	// find the earliest incoming chunk
 	newChunks := chunks
 	earliestChunk := newChunks[0]
@@ -86,10 +90,6 @@ func (fh *FileHandle) AddChunks(chunks []*filer_pb.FileChunk) {
 		}
 	}
 
-	if fh.entry == nil {
-		return
-	}
-
 	// pick out-of-order chunks from existing chunks
 	for _, chunk := range fh.entry.Chunks {
 		if lessThan(earliestChunk, chunk) {

weed/mount/weedfs_file_read.go

@@ -39,8 +39,8 @@ func (wfs *WFS) Read(cancel <-chan struct{}, in *fuse.ReadIn, buff []byte) (fuse
 		return nil, fuse.ENOENT
 	}
 
-	fh.entryLock.Lock()
-	defer fh.entryLock.Unlock()
+	fh.Lock()
+	defer fh.Unlock()
 
 	offset := int64(in.Offset)
 	totalRead, err := readDataByFileHandle(buff, fh, offset)