invalidate_inode_pages2

[Andrea Arcangeli <andrea@suse.de>]

Something broke in invalidate_inode_pages2 between 2.4 and 2.6, this
causes malfunctions with mapped pages in 2.6.

I guess the below untested one liner should be enough to fix it. The
only single point of invalidate_inode_pages2, is to invalidate _mapped_
pages too. Otherwise we could as well use invalidate_inode_pages.
Clearly the dirty bit doesn't mean invalidate, invalidate primarly means
clearing the uptodate bitflag.

--- sles/mm/truncate.c.~1~	2004-05-18 19:24:40.000000000 +0200
+++ sles/mm/truncate.c	2004-05-19 02:09:28.311781864 +0200
@@ -260,9 +260,10 @@ void invalidate_inode_pages2(struct addr
 			if (page->mapping == mapping) {	/* truncate race? */
 				wait_on_page_writeback(page);
 				next = page->index + 1;
-				if (page_mapped(page))
+				if (page_mapped(page)) {
+					ClearPageUptodate(page);
 					clear_page_dirty(page);
-				else
+				} else
 					invalidate_complete_page(mapping, page);
 			}
 			unlock_page(page);