2450 static int filemap_update_page(struct kiocb *iocb,  in filemap_update_page()  argument
2456 	if (iocb->ki_flags & IOCB_NOWAIT) {  in filemap_update_page()
2465 		if (iocb->ki_flags & (IOCB_NOWAIT | IOCB_NOIO))  in filemap_update_page()
2467 		if (!(iocb->ki_flags & IOCB_WAITQ)) {  in filemap_update_page()
2476 		error = __folio_lock_async(folio, iocb->ki_waitq);  in filemap_update_page()
2486 	if (filemap_range_uptodate(mapping, iocb->ki_pos, count, folio,  in filemap_update_page()
2491 	if (iocb->ki_flags & (IOCB_NOIO | IOCB_NOWAIT | IOCB_WAITQ))  in filemap_update_page()
2494 	error = filemap_read_folio(iocb->ki_filp, mapping->a_ops->read_folio,  in filemap_update_page()
2551 static int filemap_readahead(struct kiocb *iocb, struct file *file,  in filemap_readahead()  argument
2557 	if (iocb->ki_flags & IOCB_NOIO)  in filemap_readahead()
2563 static int filemap_get_pages(struct kiocb *iocb, size_t count,  in filemap_get_pages()  argument
2566 	struct file *filp = iocb->ki_filp;  in filemap_get_pages()
2569 	pgoff_t index = iocb->ki_pos >> PAGE_SHIFT;  in filemap_get_pages()
2575 	last_index = DIV_ROUND_UP(iocb->ki_pos + count, PAGE_SIZE);  in filemap_get_pages()
2582 		if (iocb->ki_flags & IOCB_NOIO)  in filemap_get_pages()
2589 		if (iocb->ki_flags & (IOCB_NOWAIT | IOCB_WAITQ))  in filemap_get_pages()
2592 				iocb->ki_pos >> PAGE_SHIFT, fbatch);  in filemap_get_pages()
2600 		err = filemap_readahead(iocb, filp, mapping, folio, last_index);  in filemap_get_pages()
2605 		if ((iocb->ki_flags & IOCB_WAITQ) &&  in filemap_get_pages()
2607 			iocb->ki_flags |= IOCB_NOWAIT;  in filemap_get_pages()
2608 		err = filemap_update_page(iocb, mapping, count, folio,  in filemap_get_pages()
2645 ssize_t filemap_read(struct kiocb *iocb, struct iov_iter *iter,  in filemap_read()  argument
2648 	struct file *filp = iocb->ki_filp;  in filemap_read()
2658 	if (unlikely(iocb->ki_pos >= inode->i_sb->s_maxbytes))  in filemap_read()
2674 		if ((iocb->ki_flags & IOCB_WAITQ) && already_read)  in filemap_read()
2675 			iocb->ki_flags |= IOCB_NOWAIT;  in filemap_read()
2677 		if (unlikely(iocb->ki_pos >= i_size_read(inode)))  in filemap_read()
2680 		error = filemap_get_pages(iocb, iter->count, &fbatch, false);  in filemap_read()
2693 		if (unlikely(iocb->ki_pos >= isize))  in filemap_read()
2695 		end_offset = min_t(loff_t, isize, iocb->ki_pos + iter->count);  in filemap_read()
2716 		if (!pos_same_folio(iocb->ki_pos, last_pos - 1,  in filemap_read()
2723 			size_t offset = iocb->ki_pos & (fsize - 1);  in filemap_read()
2724 			size_t bytes = min_t(loff_t, end_offset - iocb->ki_pos,  in filemap_read()
2743 			iocb->ki_pos += copied;  in filemap_read()
2744 			last_pos = iocb->ki_pos;  in filemap_read()
2755 	} while (iov_iter_count(iter) && iocb->ki_pos < isize && !error);  in filemap_read()
2763 int kiocb_write_and_wait(struct kiocb *iocb, size_t count)  in kiocb_write_and_wait()  argument
2765 	struct address_space *mapping = iocb->ki_filp->f_mapping;  in kiocb_write_and_wait()
2766 	loff_t pos = iocb->ki_pos;  in kiocb_write_and_wait()
2769 	if (iocb->ki_flags & IOCB_NOWAIT) {  in kiocb_write_and_wait()
2778 int kiocb_invalidate_pages(struct kiocb *iocb, size_t count)  in kiocb_invalidate_pages()  argument
2780 	struct address_space *mapping = iocb->ki_filp->f_mapping;  in kiocb_invalidate_pages()
2781 	loff_t pos = iocb->ki_pos;  in kiocb_invalidate_pages()
2785 	if (iocb->ki_flags & IOCB_NOWAIT) {  in kiocb_invalidate_pages()
2827 generic_file_read_iter(struct kiocb *iocb, struct iov_iter *iter)  in generic_file_read_iter()  argument
2835 	if (iocb->ki_flags & IOCB_DIRECT) {  in generic_file_read_iter()
2836 		struct file *file = iocb->ki_filp;  in generic_file_read_iter()
2840 		retval = kiocb_write_and_wait(iocb, count);  in generic_file_read_iter()
2845 		retval = mapping->a_ops->direct_IO(iocb, iter);  in generic_file_read_iter()
2847 			iocb->ki_pos += retval;  in generic_file_read_iter()
2864 		if (iocb->ki_pos >= i_size_read(inode))  in generic_file_read_iter()
2868 	return filemap_read(iocb, iter, retval);  in generic_file_read_iter()
2930 	struct kiocb iocb;  in filemap_splice_read()  local
2939 	init_sync_kiocb(&iocb, in);  in filemap_splice_read()
2940 	iocb.ki_pos = *ppos;  in filemap_splice_read()
2955 		iocb.ki_pos = *ppos;  in filemap_splice_read()
2956 		error = filemap_get_pages(&iocb, len, &fbatch, true);  in filemap_splice_read()
3902 void kiocb_invalidate_post_direct_write(struct kiocb *iocb, size_t count)  in kiocb_invalidate_post_direct_write()  argument
3904 	struct address_space *mapping = iocb->ki_filp->f_mapping;  in kiocb_invalidate_post_direct_write()
3908 			iocb->ki_pos >> PAGE_SHIFT,  in kiocb_invalidate_post_direct_write()
3909 			(iocb->ki_pos + count - 1) >> PAGE_SHIFT))  in kiocb_invalidate_post_direct_write()
3910 		dio_warn_stale_pagecache(iocb->ki_filp);  in kiocb_invalidate_post_direct_write()
3914 generic_file_direct_write(struct kiocb *iocb, struct iov_iter *from)  in generic_file_direct_write()  argument
3916 	struct address_space *mapping = iocb->ki_filp->f_mapping;  in generic_file_direct_write()
3924 	written = kiocb_invalidate_pages(iocb, write_len);  in generic_file_direct_write()
3931 	written = mapping->a_ops->direct_IO(iocb, from);  in generic_file_direct_write()
3952 		loff_t pos = iocb->ki_pos;  in generic_file_direct_write()
3954 		kiocb_invalidate_post_direct_write(iocb, written);  in generic_file_direct_write()
3961 		iocb->ki_pos = pos;  in generic_file_direct_write()
3969 ssize_t generic_perform_write(struct kiocb *iocb, struct iov_iter *i)  in generic_perform_write()  argument
3971 	struct file *file = iocb->ki_filp;  in generic_perform_write()
3972 	loff_t pos = iocb->ki_pos;  in generic_perform_write()
4045 	iocb->ki_pos += written;  in generic_perform_write()
4071 ssize_t __generic_file_write_iter(struct kiocb *iocb, struct iov_iter *from)  in __generic_file_write_iter()  argument
4073 	struct file *file = iocb->ki_filp;  in __generic_file_write_iter()
4086 	if (iocb->ki_flags & IOCB_DIRECT) {  in __generic_file_write_iter()
4087 		ret = generic_file_direct_write(iocb, from);  in __generic_file_write_iter()
4097 		return direct_write_fallback(iocb, from, ret,  in __generic_file_write_iter()
4098 				generic_perform_write(iocb, from));  in __generic_file_write_iter()
4101 	return generic_perform_write(iocb, from);  in __generic_file_write_iter()
4118 ssize_t generic_file_write_iter(struct kiocb *iocb, struct iov_iter *from)  in generic_file_write_iter()  argument
4120 	struct file *file = iocb->ki_filp;  in generic_file_write_iter()
4125 	ret = generic_write_checks(iocb, from);  in generic_file_write_iter()
4127 		ret = __generic_file_write_iter(iocb, from);  in generic_file_write_iter()
4131 		ret = generic_write_sync(iocb, ret);  in generic_file_write_iter()