Hi,

+	s->coco_dir = NULL;
+	s->fs_dir = NULL;
+	memset(s->fs_files, 0, sizeof(s->fs_files));
+
+	dent = securityfs_create_dir("coco", NULL);
+	if (IS_ERR(dent)) {
+		pr_err("Error creating coco securityfs directory entry err=%ld\n", PTR_ERR(dent));
+		return PTR_ERR(dent);
+	}
+	s->coco_dir = dent;
+
+	dent = securityfs_create_dir("efi_secret", s->coco_dir);
+	if (IS_ERR(dent)) {
+		pr_err("Error creating efi_secret securityfs directory entry err=%ld\n",
+		       PTR_ERR(dent));
+		return PTR_ERR(dent);
+	}
+	d_inode(dent)->i_op = &efi_secret_dir_inode_operations;
+	s->fs_dir = dent;

Why have two levels of subdirectories here?  Do we expect more users for
the coco/ directory?

See also the naming discussion in the cover letter sub-thread.

take care,
  Gerd