2422 static int filemap_update_page(struct kiocb *iocb,  in filemap_update_page()  argument
2428 	if (iocb->ki_flags & IOCB_NOWAIT) {  in filemap_update_page()
2437 		if (iocb->ki_flags & (IOCB_NOWAIT | IOCB_NOIO))  in filemap_update_page()
2439 		if (!(iocb->ki_flags & IOCB_WAITQ)) {  in filemap_update_page()
2448 		error = __folio_lock_async(folio, iocb->ki_waitq);  in filemap_update_page()
2458 	if (filemap_range_uptodate(mapping, iocb->ki_pos, count, folio,  in filemap_update_page()
2463 	if (iocb->ki_flags & (IOCB_NOIO | IOCB_NOWAIT | IOCB_WAITQ))  in filemap_update_page()
2466 	error = filemap_read_folio(iocb->ki_filp, mapping->a_ops->read_folio,  in filemap_update_page()
2523 static int filemap_readahead(struct kiocb *iocb, struct file *file,  in filemap_readahead()  argument
2529 	if (iocb->ki_flags & IOCB_NOIO)  in filemap_readahead()
2535 static int filemap_get_pages(struct kiocb *iocb, size_t count,  in filemap_get_pages()  argument
2538 	struct file *filp = iocb->ki_filp;  in filemap_get_pages()
2541 	pgoff_t index = iocb->ki_pos >> PAGE_SHIFT;  in filemap_get_pages()
2547 	last_index = DIV_ROUND_UP(iocb->ki_pos + count, PAGE_SIZE);  in filemap_get_pages()
2554 		if (iocb->ki_flags & IOCB_NOIO)  in filemap_get_pages()
2561 		if (iocb->ki_flags & (IOCB_NOWAIT | IOCB_WAITQ))  in filemap_get_pages()
2564 				iocb->ki_pos >> PAGE_SHIFT, fbatch);  in filemap_get_pages()
2572 		err = filemap_readahead(iocb, filp, mapping, folio, last_index);  in filemap_get_pages()
2577 		if ((iocb->ki_flags & IOCB_WAITQ) &&  in filemap_get_pages()
2579 			iocb->ki_flags |= IOCB_NOWAIT;  in filemap_get_pages()
2580 		err = filemap_update_page(iocb, mapping, count, folio,  in filemap_get_pages()
2617 ssize_t filemap_read(struct kiocb *iocb, struct iov_iter *iter,  in filemap_read()  argument
2620 	struct file *filp = iocb->ki_filp;  in filemap_read()
2630 	if (unlikely(iocb->ki_pos >= inode->i_sb->s_maxbytes))  in filemap_read()
2646 		if ((iocb->ki_flags & IOCB_WAITQ) && already_read)  in filemap_read()
2647 			iocb->ki_flags |= IOCB_NOWAIT;  in filemap_read()
2649 		if (unlikely(iocb->ki_pos >= i_size_read(inode)))  in filemap_read()
2652 		error = filemap_get_pages(iocb, iter->count, &fbatch, false);  in filemap_read()
2665 		if (unlikely(iocb->ki_pos >= isize))  in filemap_read()
2667 		end_offset = min_t(loff_t, isize, iocb->ki_pos + iter->count);  in filemap_read()
2679 		if (!pos_same_folio(iocb->ki_pos, last_pos - 1,  in filemap_read()
2686 			size_t offset = iocb->ki_pos & (fsize - 1);  in filemap_read()
2687 			size_t bytes = min_t(loff_t, end_offset - iocb->ki_pos,  in filemap_read()
2706 			iocb->ki_pos += copied;  in filemap_read()
2707 			last_pos = iocb->ki_pos;  in filemap_read()
2718 	} while (iov_iter_count(iter) && iocb->ki_pos < isize && !error);  in filemap_read()
2726 int kiocb_write_and_wait(struct kiocb *iocb, size_t count)  in kiocb_write_and_wait()  argument
2728 	struct address_space *mapping = iocb->ki_filp->f_mapping;  in kiocb_write_and_wait()
2729 	loff_t pos = iocb->ki_pos;  in kiocb_write_and_wait()
2732 	if (iocb->ki_flags & IOCB_NOWAIT) {  in kiocb_write_and_wait()
2741 int kiocb_invalidate_pages(struct kiocb *iocb, size_t count)  in kiocb_invalidate_pages()  argument
2743 	struct address_space *mapping = iocb->ki_filp->f_mapping;  in kiocb_invalidate_pages()
2744 	loff_t pos = iocb->ki_pos;  in kiocb_invalidate_pages()
2748 	if (iocb->ki_flags & IOCB_NOWAIT) {  in kiocb_invalidate_pages()
2790 generic_file_read_iter(struct kiocb *iocb, struct iov_iter *iter)  in generic_file_read_iter()  argument
2798 	if (iocb->ki_flags & IOCB_DIRECT) {  in generic_file_read_iter()
2799 		struct file *file = iocb->ki_filp;  in generic_file_read_iter()
2803 		retval = kiocb_write_and_wait(iocb, count);  in generic_file_read_iter()
2808 		retval = mapping->a_ops->direct_IO(iocb, iter);  in generic_file_read_iter()
2810 			iocb->ki_pos += retval;  in generic_file_read_iter()
2827 		if (iocb->ki_pos >= i_size_read(inode))  in generic_file_read_iter()
2831 	return filemap_read(iocb, iter, retval);  in generic_file_read_iter()
2893 	struct kiocb iocb;  in filemap_splice_read()  local
2902 	init_sync_kiocb(&iocb, in);  in filemap_splice_read()
2903 	iocb.ki_pos = *ppos;  in filemap_splice_read()
2918 		iocb.ki_pos = *ppos;  in filemap_splice_read()
2919 		error = filemap_get_pages(&iocb, len, &fbatch, true);  in filemap_splice_read()
3865 void kiocb_invalidate_post_direct_write(struct kiocb *iocb, size_t count)  in kiocb_invalidate_post_direct_write()  argument
3867 	struct address_space *mapping = iocb->ki_filp->f_mapping;  in kiocb_invalidate_post_direct_write()
3871 			iocb->ki_pos >> PAGE_SHIFT,  in kiocb_invalidate_post_direct_write()
3872 			(iocb->ki_pos + count - 1) >> PAGE_SHIFT))  in kiocb_invalidate_post_direct_write()
3873 		dio_warn_stale_pagecache(iocb->ki_filp);  in kiocb_invalidate_post_direct_write()
3877 generic_file_direct_write(struct kiocb *iocb, struct iov_iter *from)  in generic_file_direct_write()  argument
3879 	struct address_space *mapping = iocb->ki_filp->f_mapping;  in generic_file_direct_write()
3887 	written = kiocb_invalidate_pages(iocb, write_len);  in generic_file_direct_write()
3894 	written = mapping->a_ops->direct_IO(iocb, from);  in generic_file_direct_write()
3915 		loff_t pos = iocb->ki_pos;  in generic_file_direct_write()
3917 		kiocb_invalidate_post_direct_write(iocb, written);  in generic_file_direct_write()
3924 		iocb->ki_pos = pos;  in generic_file_direct_write()
3932 ssize_t generic_perform_write(struct kiocb *iocb, struct iov_iter *i)  in generic_perform_write()  argument
3934 	struct file *file = iocb->ki_filp;  in generic_perform_write()
3935 	loff_t pos = iocb->ki_pos;  in generic_perform_write()
4008 	iocb->ki_pos += written;  in generic_perform_write()
4034 ssize_t __generic_file_write_iter(struct kiocb *iocb, struct iov_iter *from)  in __generic_file_write_iter()  argument
4036 	struct file *file = iocb->ki_filp;  in __generic_file_write_iter()
4049 	if (iocb->ki_flags & IOCB_DIRECT) {  in __generic_file_write_iter()
4050 		ret = generic_file_direct_write(iocb, from);  in __generic_file_write_iter()
4060 		return direct_write_fallback(iocb, from, ret,  in __generic_file_write_iter()
4061 				generic_perform_write(iocb, from));  in __generic_file_write_iter()
4064 	return generic_perform_write(iocb, from);  in __generic_file_write_iter()
4081 ssize_t generic_file_write_iter(struct kiocb *iocb, struct iov_iter *from)  in generic_file_write_iter()  argument
4083 	struct file *file = iocb->ki_filp;  in generic_file_write_iter()
4088 	ret = generic_write_checks(iocb, from);  in generic_file_write_iter()
4090 		ret = __generic_file_write_iter(iocb, from);  in generic_file_write_iter()
4094 		ret = generic_write_sync(iocb, ret);  in generic_file_write_iter()