mount: change maximum leaf name length to 1024 bytes - fixes #3884

This limit was previously 4k set in 59026c4761e3926f however leaf
names above 1k now produce an IO error.

WinFSP seems to have its own method for dropping too long file names
above 255 long.

cmd/mount/dir.go

@@ -108,7 +108,7 @@ func (d *Dir) ReadDirAll(ctx context.Context) (dirents []fuse.Dirent, err error)
 	}
 	for _, node := range items {
 		name := node.Name()
-		if len(name) >= mountlib.MaxLeafSize {
+		if len(name) > mountlib.MaxLeafSize {
 			fs.Errorf(d, "Name too long (%d bytes) for FUSE, skipping: %s", len(name), name)
 			continue
 		}

cmd/mountlib/mount.go

@@ -48,7 +48,7 @@ type (
 
 // Global constants
 const (
-	MaxLeafSize = 4095 // don't pass file names longer than this
+	MaxLeafSize = 1024 // don't pass file names longer than this
 )
 
 func init() {