[PATCHv3 15/41] filemap: handle huge pages in do_generic_file_read()

["Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>]

Most of work happans on head page. Only when we need to do copy data to
userspace we find relevant subpage.

We are still limited by PAGE_SIZE per iteration. Lifting this limitation
would require some more work.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
 mm/filemap.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/mm/filemap.c b/mm/filemap.c
index 50afe17230e7..b77bcf6843ee 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -1860,6 +1860,7 @@ find_page:
 			if (unlikely(page == NULL))
 				goto no_cached_page;
 		}
+		page = compound_head(page);
 		if (PageReadahead(page)) {
 			page_cache_async_readahead(mapping,
 					ra, filp, page,
@@ -1936,7 +1937,8 @@ page_ok:
 		 * now we can copy it to user space...
 		 */
 
-		ret = copy_page_to_iter(page, offset, nr, iter);
+		ret = copy_page_to_iter(page + index - page->index, offset,
+				nr, iter);
 		offset += ret;
 		index += offset >> PAGE_SHIFT;
 		offset &= ~PAGE_MASK;
@@ -2356,6 +2358,7 @@ page_not_uptodate:
 	 * because there really aren't any performance issues here
 	 * and we need to check for errors.
 	 */
+	page = compound_head(page);
 	ClearPageError(page);
 	error = mapping->a_ops->readpage(file, page);
 	if (!error) {
-- 
2.9.3