+int obdfs_create (struct inode * dir, struct dentry * dentry, int mode);
+int obdfs_mkdir(struct inode *dir, struct dentry *dentry, int mode);
+int obdfs_rmdir(struct inode *dir, struct dentry *dentry);
+int obdfs_unlink(struct inode *dir, struct dentry *dentry);
+int obdfs_mknod(struct inode *dir, struct dentry *dentry, int mode, int rdev);
+int obdfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname);
+int obdfs_link(struct dentry *old_dentry, struct inode *dir, struct dentry *dentry);
+int obdfs_rename(struct inode *old_dir, struct dentry *old_dentry, struct inode *new_dir, struct dentry *new_dentry);