mount: add umask option

related to https://github.com/chrislusf/seaweedfs/issues/978

weed/filesys/dir.go

@@ -101,7 +101,7 @@ func (dir *Dir) Create(ctx context.Context, req *fuse.CreateRequest,
 			Attributes: &filer_pb.FuseAttributes{
 				Mtime:       time.Now().Unix(),
 				Crtime:      time.Now().Unix(),
-				FileMode:    uint32(req.Mode),
+				FileMode:    uint32(req.Mode &^ dir.wfs.option.Umask),
 				Uid:         req.Uid,
 				Gid:         req.Gid,
 				Collection:  dir.wfs.option.Collection,
@@ -146,7 +146,7 @@ func (dir *Dir) Mkdir(ctx context.Context, req *fuse.MkdirRequest) (fs.Node, err
 				Attributes: &filer_pb.FuseAttributes{
 					Mtime:    time.Now().Unix(),
 					Crtime:   time.Now().Unix(),
-					FileMode: uint32(req.Mode),
+					FileMode: uint32(req.Mode &^ dir.wfs.option.Umask),
 					Uid:      req.Uid,
 					Gid:      req.Gid,
 				},

weed/filesys/dir_link.go

@@ -27,7 +27,7 @@ func (dir *Dir) Symlink(ctx context.Context, req *fuse.SymlinkRequest) (fs.Node,
 			Attributes: &filer_pb.FuseAttributes{
 				Mtime:         time.Now().Unix(),
 				Crtime:        time.Now().Unix(),
-				FileMode:      uint32(os.FileMode(0755) | os.ModeSymlink),
+				FileMode:      uint32((os.FileMode(0777) | os.ModeSymlink) &^ dir.wfs.option.Umask),
 				Uid:           req.Uid,
 				Gid:           req.Gid,
 				SymlinkTarget: req.Target,

weed/filesys/filehandle.go

@@ -148,7 +148,7 @@ func (fh *FileHandle) Flush(ctx context.Context, req *fuse.FlushRequest) error {
 			fh.f.entry.Attributes.Gid = req.Gid
 			fh.f.entry.Attributes.Mtime = time.Now().Unix()
 			fh.f.entry.Attributes.Crtime = time.Now().Unix()
-			fh.f.entry.Attributes.FileMode = uint32(0770)
+			fh.f.entry.Attributes.FileMode = uint32(0777 &^ fh.f.wfs.option.Umask)
 		}
 
 		request := &filer_pb.CreateEntryRequest{

weed/filesys/wfs.go

@@ -28,6 +28,7 @@ type Option struct {
 	DataCenter         string
 	DirListingLimit    int
 	EntryCacheTtl      time.Duration
+	Umask              os.FileMode
 
 	MountUid   uint32
 	MountGid   uint32