Linux Cross Reference
Linux/include/linux/proc_fs_i.h

   struct proc_inode_info {
           struct task_struct *task;
           int type;
           union {
                   int (*proc_get_link)(struct inode *, struct dentry **, struct vfsmount **);
                   int (*proc_read)(struct task_struct *task, char *page);
           } op;
           struct file *file;
   };