2407 static int filemap_update_page(struct kiocb *iocb,  in filemap_update_page()  argument
2413 	if (iocb->ki_flags & IOCB_NOWAIT) {  in filemap_update_page()
2422 		if (iocb->ki_flags & (IOCB_NOWAIT | IOCB_NOIO))  in filemap_update_page()
2424 		if (!(iocb->ki_flags & IOCB_WAITQ)) {  in filemap_update_page()
2433 		error = __folio_lock_async(folio, iocb->ki_waitq);  in filemap_update_page()
2443 	if (filemap_range_uptodate(mapping, iocb->ki_pos, count, folio,  in filemap_update_page()
2448 	if (iocb->ki_flags & (IOCB_NOIO | IOCB_NOWAIT | IOCB_WAITQ))  in filemap_update_page()
2451 	error = filemap_read_folio(iocb->ki_filp, mapping->a_ops->read_folio,  in filemap_update_page()
2511 static int filemap_readahead(struct kiocb *iocb, struct file *file,  in filemap_readahead()  argument
2517 	if (iocb->ki_flags & IOCB_NOIO)  in filemap_readahead()
2523 static int filemap_get_pages(struct kiocb *iocb, size_t count,  in filemap_get_pages()  argument
2526 	struct file *filp = iocb->ki_filp;  in filemap_get_pages()
2529 	pgoff_t index = iocb->ki_pos >> PAGE_SHIFT;  in filemap_get_pages()
2536 	last_index = DIV_ROUND_UP(iocb->ki_pos + count, PAGE_SIZE);  in filemap_get_pages()
2543 		if (iocb->ki_flags & IOCB_NOIO)  in filemap_get_pages()
2545 		if (iocb->ki_flags & IOCB_NOWAIT)  in filemap_get_pages()
2549 		if (iocb->ki_flags & IOCB_NOWAIT)  in filemap_get_pages()
2554 		if (iocb->ki_flags & (IOCB_NOWAIT | IOCB_WAITQ))  in filemap_get_pages()
2556 		err = filemap_create_folio(filp, mapping, iocb->ki_pos, fbatch);  in filemap_get_pages()
2564 		err = filemap_readahead(iocb, filp, mapping, folio, last_index);  in filemap_get_pages()
2569 		if ((iocb->ki_flags & IOCB_WAITQ) &&  in filemap_get_pages()
2571 			iocb->ki_flags |= IOCB_NOWAIT;  in filemap_get_pages()
2572 		err = filemap_update_page(iocb, mapping, count, folio,  in filemap_get_pages()
2610 ssize_t filemap_read(struct kiocb *iocb, struct iov_iter *iter,  in filemap_read()  argument
2613 	struct file *filp = iocb->ki_filp;  in filemap_read()
2623 	if (unlikely(iocb->ki_pos >= inode->i_sb->s_maxbytes))  in filemap_read()
2628 	iov_iter_truncate(iter, inode->i_sb->s_maxbytes - iocb->ki_pos);  in filemap_read()
2639 		if ((iocb->ki_flags & IOCB_WAITQ) && already_read)  in filemap_read()
2640 			iocb->ki_flags |= IOCB_NOWAIT;  in filemap_read()
2642 		if (unlikely(iocb->ki_pos >= i_size_read(inode)))  in filemap_read()
2645 		error = filemap_get_pages(iocb, iter->count, &fbatch, false);  in filemap_read()
2658 		if (unlikely(iocb->ki_pos >= isize))  in filemap_read()
2660 		end_offset = min_t(loff_t, isize, iocb->ki_pos + iter->count);  in filemap_read()
2672 		if (!pos_same_folio(iocb->ki_pos, last_pos - 1,  in filemap_read()
2679 			size_t offset = iocb->ki_pos & (fsize - 1);  in filemap_read()
2680 			size_t bytes = min_t(loff_t, end_offset - iocb->ki_pos,  in filemap_read()
2699 			iocb->ki_pos += copied;  in filemap_read()
2700 			last_pos = iocb->ki_pos;  in filemap_read()
2711 	} while (iov_iter_count(iter) && iocb->ki_pos < isize && !error);  in filemap_read()
2719 int kiocb_write_and_wait(struct kiocb *iocb, size_t count)  in kiocb_write_and_wait()  argument
2721 	struct address_space *mapping = iocb->ki_filp->f_mapping;  in kiocb_write_and_wait()
2722 	loff_t pos = iocb->ki_pos;  in kiocb_write_and_wait()
2725 	if (iocb->ki_flags & IOCB_NOWAIT) {  in kiocb_write_and_wait()
2760 int kiocb_invalidate_pages(struct kiocb *iocb, size_t count)  in kiocb_invalidate_pages()  argument
2762 	struct address_space *mapping = iocb->ki_filp->f_mapping;  in kiocb_invalidate_pages()
2764 	return filemap_invalidate_pages(mapping, iocb->ki_pos,  in kiocb_invalidate_pages()
2765 					iocb->ki_pos + count - 1,  in kiocb_invalidate_pages()
2766 					iocb->ki_flags & IOCB_NOWAIT);  in kiocb_invalidate_pages()
2792 generic_file_read_iter(struct kiocb *iocb, struct iov_iter *iter)  in generic_file_read_iter()  argument
2800 	if (iocb->ki_flags & IOCB_DIRECT) {  in generic_file_read_iter()
2801 		struct file *file = iocb->ki_filp;  in generic_file_read_iter()
2805 		retval = kiocb_write_and_wait(iocb, count);  in generic_file_read_iter()
2810 		retval = mapping->a_ops->direct_IO(iocb, iter);  in generic_file_read_iter()
2812 			iocb->ki_pos += retval;  in generic_file_read_iter()
2829 		if (iocb->ki_pos >= i_size_read(inode))  in generic_file_read_iter()
2833 	return filemap_read(iocb, iter, retval);  in generic_file_read_iter()
2895 	struct kiocb iocb;  in filemap_splice_read()  local
2904 	init_sync_kiocb(&iocb, in);  in filemap_splice_read()
2905 	iocb.ki_pos = *ppos;  in filemap_splice_read()
2920 		iocb.ki_pos = *ppos;  in filemap_splice_read()
2921 		error = filemap_get_pages(&iocb, len, &fbatch, true);  in filemap_splice_read()
3948 void kiocb_invalidate_post_direct_write(struct kiocb *iocb, size_t count)  in kiocb_invalidate_post_direct_write()  argument
3950 	struct address_space *mapping = iocb->ki_filp->f_mapping;  in kiocb_invalidate_post_direct_write()
3954 			iocb->ki_pos >> PAGE_SHIFT,  in kiocb_invalidate_post_direct_write()
3955 			(iocb->ki_pos + count - 1) >> PAGE_SHIFT))  in kiocb_invalidate_post_direct_write()
3956 		dio_warn_stale_pagecache(iocb->ki_filp);  in kiocb_invalidate_post_direct_write()
3960 generic_file_direct_write(struct kiocb *iocb, struct iov_iter *from)  in generic_file_direct_write()  argument
3962 	struct address_space *mapping = iocb->ki_filp->f_mapping;  in generic_file_direct_write()
3970 	written = kiocb_invalidate_pages(iocb, write_len);  in generic_file_direct_write()
3977 	written = mapping->a_ops->direct_IO(iocb, from);  in generic_file_direct_write()
3998 		loff_t pos = iocb->ki_pos;  in generic_file_direct_write()
4000 		kiocb_invalidate_post_direct_write(iocb, written);  in generic_file_direct_write()
4007 		iocb->ki_pos = pos;  in generic_file_direct_write()
4015 ssize_t generic_perform_write(struct kiocb *iocb, struct iov_iter *i)  in generic_perform_write()  argument
4017 	struct file *file = iocb->ki_filp;  in generic_perform_write()
4018 	loff_t pos = iocb->ki_pos;  in generic_perform_write()
4099 	iocb->ki_pos += written;  in generic_perform_write()
4125 ssize_t __generic_file_write_iter(struct kiocb *iocb, struct iov_iter *from)  in __generic_file_write_iter()  argument
4127 	struct file *file = iocb->ki_filp;  in __generic_file_write_iter()
4140 	if (iocb->ki_flags & IOCB_DIRECT) {  in __generic_file_write_iter()
4141 		ret = generic_file_direct_write(iocb, from);  in __generic_file_write_iter()
4151 		return direct_write_fallback(iocb, from, ret,  in __generic_file_write_iter()
4152 				generic_perform_write(iocb, from));  in __generic_file_write_iter()
4155 	return generic_perform_write(iocb, from);  in __generic_file_write_iter()
4172 ssize_t generic_file_write_iter(struct kiocb *iocb, struct iov_iter *from)  in generic_file_write_iter()  argument
4174 	struct file *file = iocb->ki_filp;  in generic_file_write_iter()
4179 	ret = generic_write_checks(iocb, from);  in generic_file_write_iter()
4181 		ret = __generic_file_write_iter(iocb, from);  in generic_file_write_iter()
4185 		ret = generic_write_sync(iocb, ret);  in generic_file_write_iter()