[PATCH] vm: add per-zone writeout counter

[linux-2.6-microblaze.git] / mm / truncate.c

diff --git a/mm/truncate.c b/mm/truncate.c
index cf1b015..c6ab55e 100644 (file)
--- a/mm/truncate.c
+++ b/mm/truncate.c
@@ -68,10 +68,10 @@ invalidate_complete_page(struct address_space *mapping, struct page *page)
                return 0;
 
        write_lock_irq(&mapping->tree_lock);
-       if (PageDirty(page)) {
-               write_unlock_irq(&mapping->tree_lock);
-               return 0;
-       }
+       if (PageDirty(page))
+               goto failed;
+       if (page_count(page) != 2)      /* caller's ref + pagecache ref */
+               goto failed;
 
        BUG_ON(PagePrivate(page));
        __remove_from_page_cache(page);
@@ -79,6 +79,9 @@ invalidate_complete_page(struct address_space *mapping, struct page *page)
        ClearPageUptodate(page);
        page_cache_release(page);       /* pagecache ref */
        return 1;
+failed:
+       write_unlock_irq(&mapping->tree_lock);
+       return 0;
 }
 
 /**