我可以从主号码和副号码中获取设备结构吗

Question

我想实现linux安全钩子security_inode_mknod。有一个参数dev，我想用它来获取设备结构并将该结构放入usb_deauthorize_device(struct usb_device *usb_dev)和{ {3}}阻止USB设备和SATA设备， 这种方法可行吗？如果没有，我可以使用其他参数来获取它吗？

 *  Check permissions when creating a special file (or a socket or a fifo
 *  file created via the mknod system call).  Note that if mknod operation
 *  is being done for a regular file, then the create hook will be called
 *  and not this hook.
 *  @dir contains the inode structure of parent of the new file.
 *  @dentry contains the dentry structure of the new file.
 *  @mode contains the mode of the new file.
 *  @dev contains the device number.
 *  Return 0 if permission is granted.
static inline int security_inode_mknod(struct inode *dir,
                    struct dentry *dentry,
                    int mode, dev_t dev)