2441 static int filemap_update_page(struct kiocb *iocb,  in filemap_update_page()  argument
2447 	if (iocb->ki_flags & IOCB_NOWAIT) {  in filemap_update_page()
2456 		if (iocb->ki_flags & (IOCB_NOWAIT | IOCB_NOIO))  in filemap_update_page()
2458 		if (!(iocb->ki_flags & IOCB_WAITQ)) {  in filemap_update_page()
2467 		error = __folio_lock_async(folio, iocb->ki_waitq);  in filemap_update_page()
2477 	if (filemap_range_uptodate(mapping, iocb->ki_pos, count, folio,  in filemap_update_page()
2482 	if (iocb->ki_flags & (IOCB_NOIO | IOCB_NOWAIT | IOCB_WAITQ))  in filemap_update_page()
2485 	error = filemap_read_folio(iocb->ki_filp, mapping->a_ops->read_folio,  in filemap_update_page()
2497 static int filemap_create_folio(struct kiocb *iocb, struct folio_batch *fbatch)  in filemap_create_folio()  argument
2499 	struct address_space *mapping = iocb->ki_filp->f_mapping;  in filemap_create_folio()
2505 	if (iocb->ki_flags & (IOCB_NOWAIT | IOCB_WAITQ))  in filemap_create_folio()
2511 	if (iocb->ki_flags & IOCB_DONTCACHE)  in filemap_create_folio()
2528 	index = (iocb->ki_pos >> (PAGE_SHIFT + min_order)) << min_order;  in filemap_create_folio()
2536 	error = filemap_read_folio(iocb->ki_filp, mapping->a_ops->read_folio,  in filemap_create_folio()
2550 static int filemap_readahead(struct kiocb *iocb, struct file *file,  in filemap_readahead()  argument
2556 	if (iocb->ki_flags & IOCB_NOIO)  in filemap_readahead()
2558 	if (iocb->ki_flags & IOCB_DONTCACHE)  in filemap_readahead()
2564 static int filemap_get_pages(struct kiocb *iocb, size_t count,  in filemap_get_pages()  argument
2567 	struct file *filp = iocb->ki_filp;  in filemap_get_pages()
2569 	pgoff_t index = iocb->ki_pos >> PAGE_SHIFT;  in filemap_get_pages()
2576 	last_index = DIV_ROUND_UP(iocb->ki_pos + count, PAGE_SIZE);  in filemap_get_pages()
2585 		if (iocb->ki_flags & IOCB_NOIO)  in filemap_get_pages()
2587 		if (iocb->ki_flags & IOCB_NOWAIT)  in filemap_get_pages()
2589 		if (iocb->ki_flags & IOCB_DONTCACHE)  in filemap_get_pages()
2592 		if (iocb->ki_flags & IOCB_NOWAIT)  in filemap_get_pages()
2597 		err = filemap_create_folio(iocb, fbatch);  in filemap_get_pages()
2605 		err = filemap_readahead(iocb, filp, mapping, folio, last_index);  in filemap_get_pages()
2610 		if ((iocb->ki_flags & IOCB_WAITQ) &&  in filemap_get_pages()
2612 			iocb->ki_flags |= IOCB_NOWAIT;  in filemap_get_pages()
2613 		err = filemap_update_page(iocb, mapping, count, folio,  in filemap_get_pages()
2665 ssize_t filemap_read(struct kiocb *iocb, struct iov_iter *iter,  in filemap_read()  argument
2668 	struct file *filp = iocb->ki_filp;  in filemap_read()
2678 	if (unlikely(iocb->ki_pos < 0))  in filemap_read()
2680 	if (unlikely(iocb->ki_pos >= inode->i_sb->s_maxbytes))  in filemap_read()
2685 	iov_iter_truncate(iter, inode->i_sb->s_maxbytes - iocb->ki_pos);  in filemap_read()
2696 		if ((iocb->ki_flags & IOCB_WAITQ) && already_read)  in filemap_read()
2697 			iocb->ki_flags |= IOCB_NOWAIT;  in filemap_read()
2699 		if (unlikely(iocb->ki_pos >= i_size_read(inode)))  in filemap_read()
2702 		error = filemap_get_pages(iocb, iter->count, &fbatch, false);  in filemap_read()
2715 		if (unlikely(iocb->ki_pos >= isize))  in filemap_read()
2717 		end_offset = min_t(loff_t, isize, iocb->ki_pos + iter->count);  in filemap_read()
2729 		if (!pos_same_folio(iocb->ki_pos, last_pos - 1,  in filemap_read()
2736 			size_t offset = iocb->ki_pos & (fsize - 1);  in filemap_read()
2737 			size_t bytes = min_t(loff_t, end_offset - iocb->ki_pos,  in filemap_read()
2756 			iocb->ki_pos += copied;  in filemap_read()
2757 			last_pos = iocb->ki_pos;  in filemap_read()
2772 	} while (iov_iter_count(iter) && iocb->ki_pos < isize && !error);  in filemap_read()
2780 int kiocb_write_and_wait(struct kiocb *iocb, size_t count)  in kiocb_write_and_wait()  argument
2782 	struct address_space *mapping = iocb->ki_filp->f_mapping;  in kiocb_write_and_wait()
2783 	loff_t pos = iocb->ki_pos;  in kiocb_write_and_wait()
2786 	if (iocb->ki_flags & IOCB_NOWAIT) {  in kiocb_write_and_wait()
2821 int kiocb_invalidate_pages(struct kiocb *iocb, size_t count)  in kiocb_invalidate_pages()  argument
2823 	struct address_space *mapping = iocb->ki_filp->f_mapping;  in kiocb_invalidate_pages()
2825 	return filemap_invalidate_pages(mapping, iocb->ki_pos,  in kiocb_invalidate_pages()
2826 					iocb->ki_pos + count - 1,  in kiocb_invalidate_pages()
2827 					iocb->ki_flags & IOCB_NOWAIT);  in kiocb_invalidate_pages()
2853 generic_file_read_iter(struct kiocb *iocb, struct iov_iter *iter)  in generic_file_read_iter()  argument
2861 	if (iocb->ki_flags & IOCB_DIRECT) {  in generic_file_read_iter()
2862 		struct file *file = iocb->ki_filp;  in generic_file_read_iter()
2866 		retval = kiocb_write_and_wait(iocb, count);  in generic_file_read_iter()
2871 		retval = mapping->a_ops->direct_IO(iocb, iter);  in generic_file_read_iter()
2873 			iocb->ki_pos += retval;  in generic_file_read_iter()
2890 		if (iocb->ki_pos >= i_size_read(inode))  in generic_file_read_iter()
2894 	return filemap_read(iocb, iter, retval);  in generic_file_read_iter()
2955 	struct kiocb iocb;  in filemap_splice_read()  local
2964 	init_sync_kiocb(&iocb, in);  in filemap_splice_read()
2965 	iocb.ki_pos = *ppos;  in filemap_splice_read()
2980 		iocb.ki_pos = *ppos;  in filemap_splice_read()
2981 		error = filemap_get_pages(&iocb, len, &fbatch, true);  in filemap_splice_read()
4008 void kiocb_invalidate_post_direct_write(struct kiocb *iocb, size_t count)  in kiocb_invalidate_post_direct_write()  argument
4010 	struct address_space *mapping = iocb->ki_filp->f_mapping;  in kiocb_invalidate_post_direct_write()
4014 			iocb->ki_pos >> PAGE_SHIFT,  in kiocb_invalidate_post_direct_write()
4015 			(iocb->ki_pos + count - 1) >> PAGE_SHIFT))  in kiocb_invalidate_post_direct_write()
4016 		dio_warn_stale_pagecache(iocb->ki_filp);  in kiocb_invalidate_post_direct_write()
4020 generic_file_direct_write(struct kiocb *iocb, struct iov_iter *from)  in generic_file_direct_write()  argument
4022 	struct address_space *mapping = iocb->ki_filp->f_mapping;  in generic_file_direct_write()
4030 	written = kiocb_invalidate_pages(iocb, write_len);  in generic_file_direct_write()
4037 	written = mapping->a_ops->direct_IO(iocb, from);  in generic_file_direct_write()
4058 		loff_t pos = iocb->ki_pos;  in generic_file_direct_write()
4060 		kiocb_invalidate_post_direct_write(iocb, written);  in generic_file_direct_write()
4067 		iocb->ki_pos = pos;  in generic_file_direct_write()
4075 ssize_t generic_perform_write(struct kiocb *iocb, struct iov_iter *i)  in generic_perform_write()  argument
4077 	struct file *file = iocb->ki_filp;  in generic_perform_write()
4078 	loff_t pos = iocb->ki_pos;  in generic_perform_write()
4164 	iocb->ki_pos += written;  in generic_perform_write()
4190 ssize_t __generic_file_write_iter(struct kiocb *iocb, struct iov_iter *from)  in __generic_file_write_iter()  argument
4192 	struct file *file = iocb->ki_filp;  in __generic_file_write_iter()
4205 	if (iocb->ki_flags & IOCB_DIRECT) {  in __generic_file_write_iter()
4206 		ret = generic_file_direct_write(iocb, from);  in __generic_file_write_iter()
4216 		return direct_write_fallback(iocb, from, ret,  in __generic_file_write_iter()
4217 				generic_perform_write(iocb, from));  in __generic_file_write_iter()
4220 	return generic_perform_write(iocb, from);  in __generic_file_write_iter()
4237 ssize_t generic_file_write_iter(struct kiocb *iocb, struct iov_iter *from)  in generic_file_write_iter()  argument
4239 	struct file *file = iocb->ki_filp;  in generic_file_write_iter()
4244 	ret = generic_write_checks(iocb, from);  in generic_file_write_iter()
4246 		ret = __generic_file_write_iter(iocb, from);  in generic_file_write_iter()
4250 		ret = generic_write_sync(iocb, ret);  in generic_file_write_iter()