-static int write_block(unsigned long p, const char *buf, int count);
-static int flash_ioctl(struct inode *inodep, struct file *filep, unsigned int cmd, unsigned long arg);
-static ssize_t flash_read(struct file *file, char *buf, size_t count, loff_t * ppos);
-static ssize_t flash_write(struct file *file, const char *buf, size_t count, loff_t * ppos);
-static loff_t flash_llseek(struct file *file, loff_t offset, int orig);