[PATCH 1/6] LBS: fix unexported swapper_space

[Hugh Dickins <hugh@veritas.com>]

If any loadable module uses the page_mapping() inline, we would need to
export swapper_space (again: it was exported once, but janitorially
unexported); but a filesystem sees only its own pages, so reiserfs can
use page->mapping directly without needing the page_mapping() inline.

Signed-off-by: Hugh Dickins <hugh@veritas.com>

--- 2.6.23-rc6-lbs/fs/reiserfs/stree.c	2007-09-11 20:01:08.000000000 +0100
+++ linux/fs/reiserfs/stree.c	2007-09-13 20:04:04.000000000 +0100
@@ -1440,7 +1440,7 @@ static void unmap_buffers(struct page *p
 
 	if (page) {
 		if (page_has_buffers(page)) {
-			tail_index = page_cache_offset(page_mapping(page), pos);
+			tail_index = page_cache_offset(page->mapping, pos);
 			cur_index = 0;
 			head = page_buffers(page);
 			bh = head;
@@ -1461,7 +1461,7 @@ static void unmap_buffers(struct page *p
 			} while (bh != head);
 			if (PAGE_SIZE == bh->b_size) {
 				cancel_dirty_page(page,
-					page_cache_size(page_mapping(page)));
+					page_cache_size(page->mapping));
 			}
 		}
 	}