text: /* SPDX-License-Identifier: GPL-2.0 */
  #include <linux/fs.h>
  
  #ifdef CONFIG_CGROUP_DEVICE
  extern int __devcgroup_inode_permission(struct inode *inode, int mask);
  extern int devcgroup_inode_mknod(int mode, dev_t dev);
  static inline int devcgroup_inode_permission(struct inode *inode, int mask)
  {
  	if (likely(!inode->i_rdev))
  		return 0;
  	if (!S_ISBLK(inode->i_mode) && !S_ISCHR(inode->i_mode))
  		return 0;
  	return __devcgroup_inode_permission(inode, mask);
  }
  #else
  static inline int devcgroup_inode_permission(struct inode *inode, int mask)
  { return 0; }
  static inline int devcgroup_inode_mknod(int mode, dev_t dev)
  { return 0; }
  #endif
  