efs_iget
extern struct inode *efs_iget(struct super_block *, unsigned long);
parent = d_obtain_alias(efs_iget(child->d_sb, ino));
inode = efs_iget(dir->i_sb, inodenum);
inode = efs_iget(sb, ino);
root = efs_iget(s, EFS_ROOTINODE);