struct iov_iter *iter);
/* fs/block_dev.c */
-extern ssize_t blkdev_read_iter(struct kiocb *iocb, struct iov_iter *to);
-extern ssize_t blkdev_write_iter(struct kiocb *iocb, struct iov_iter *from);
extern int blkdev_fsync(struct file *filp, loff_t start, loff_t end,
int datasync);
-extern void block_sync_page(struct page *page);
/* fs/splice.c */
extern ssize_t generic_file_splice_read(struct file *, loff_t *,