struct dentry {
  atomic_t d_count;
  unsigned int d_flags;           /* protected by d_lock */
  spinlock_t d_lock;              /* per dentry lock */

  struct inode *d_inode;          /* Where the name belongs to - NULL is
                                   * negative */
  /*
   * The next three fields are touched by __d_lookup.  Place them here
   * so they all fit in a 16-byte range, with 16-byte alignment.
   */
  struct dentry *d_parent;        /* parent directory */
  struct qstr d_name;

  struct list_head d_lru;         /* LRU list */
  struct list_head d_child;       /* child of parent list */
  struct list_head d_subdirs;     /* our children */
  struct list_head d_alias;       /* inode alias list */

  unsigned long d_time;           /* used by d_revalidate */
  struct dentry_operations *d_op;
  struct super_block *d_sb;       /* The root of the dentry tree */
  void *d_fsdata;                 /* fs-specific data */

  struct rcu_head d_rcu;
  struct dcookie_struct *d_cookie; /* cookie, if any */
  struct hlist_node d_hash;       /* lookup hash list */

  int d_mounted;

  unsigned char d_iname[DNAME_INLINE_LEN_MIN];    /* small names */
};