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 <[EMAIL PROTECTED]>

--- 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));
                        }
                }
        }
-
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