mount: optimize a bit when writing files

weed/mount/weedfs_file_mkrm.go

@@ -80,6 +80,7 @@ func (wfs *WFS) Mknod(cancel <-chan struct{}, in *fuse.MknodIn, name string, out
 			Directory:                string(dirFullPath),
 			Entry:                    newEntry,
 			Signatures:               []int32{wfs.signature},
+			SkipCheckParentDirectory: true,
 		}
 
 		glog.V(1).Infof("mknod: %v", request)

weed/mount/weedfs_file_sync.go

@@ -143,6 +143,7 @@ func (wfs *WFS) doFlush(fh *FileHandle, uid, gid uint32) fuse.Status {
 			Directory:                string(dir),
 			Entry:                    entry,
 			Signatures:               []int32{wfs.signature},
+			SkipCheckParentDirectory: true,
 		}
 
 		glog.V(4).Infof("%s set chunks: %v", fileFullPath, len(entry.Chunks))