Revert "mm/filemap: fix that first page is not mark accessed in filemap_read()"

hulk inclusion
category: bugfix
bugzilla: 186896, https://gitee.com/src-openeuler/kernel/issues/I5GZC8
CVE: NA

--------------------------------

This reverts commit 499ecade.

Prepare to backport solution from mainline.
Signed-off-by: NYu Kuai <yukuai3@huawei.com>
Reviewed-by: NKefeng Wang <wangkefeng.wang@huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>

mm/filemap.c

@@ -2551,11 +2551,10 @@ ssize_t generic_file_buffered_read(struct kiocb *iocb,
 				flush_dcache_page(pages[i]);
 
 			copied = copy_page_to_iter(pages[i], offset, bytes, iter);
-			if (copied) {
-				ra->prev_pos = iocb->ki_pos;
-				written += copied;
-				iocb->ki_pos += copied;
-			}
+
+			written += copied;
+			iocb->ki_pos += copied;
+			ra->prev_pos = iocb->ki_pos;
 
 			if (copied < bytes) {
 				error = -EFAULT;