[NETFILTER]: nf_nat: add FTP NAT helper port

[safe/jmp/linux-2.6] / mm / truncate.c

diff --git a/mm/truncate.c b/mm/truncate.c
index 8fde658..e07b1e6 100644 (file)
--- a/mm/truncate.c
+++ b/mm/truncate.c
@@ -96,7 +96,6 @@ invalidate_complete_page(struct address_space *mapping, struct page *page)
                return 0;
 
        ret = remove_mapping(mapping, page);
-       ClearPageUptodate(page);
 
        return ret;
 }
@@ -287,9 +286,39 @@ unsigned long invalidate_inode_pages(struct address_space *mapping)
 {
        return invalidate_mapping_pages(mapping, 0, ~0UL);
 }
-
 EXPORT_SYMBOL(invalidate_inode_pages);
 
+/*
+ * This is like invalidate_complete_page(), except it ignores the page's
+ * refcount.  We do this because invalidate_inode_pages2() needs stronger
+ * invalidation guarantees, and cannot afford to leave pages behind because
+ * shrink_list() has a temp ref on them, or because they're transiently sitting
+ * in the lru_cache_add() pagevecs.
+ */
+static int
+invalidate_complete_page2(struct address_space *mapping, struct page *page)
+{
+       if (page->mapping != mapping)
+               return 0;
+
+       if (PagePrivate(page) && !try_to_release_page(page, GFP_KERNEL))
+               return 0;
+
+       write_lock_irq(&mapping->tree_lock);
+       if (PageDirty(page))
+               goto failed;
+
+       BUG_ON(PagePrivate(page));
+       __remove_from_page_cache(page);
+       write_unlock_irq(&mapping->tree_lock);
+       ClearPageUptodate(page);
+       page_cache_release(page);       /* pagecache ref */
+       return 1;
+failed:
+       write_unlock_irq(&mapping->tree_lock);
+       return 0;
+}
+
 /**
  * invalidate_inode_pages2_range - remove range of pages from an address_space
  * @mapping: the address_space
@@ -356,7 +385,7 @@ int invalidate_inode_pages2_range(struct address_space *mapping,
                                }
                        }
                        was_dirty = test_clear_page_dirty(page);
-                       if (!invalidate_complete_page(mapping, page)) {
+                       if (!invalidate_complete_page2(mapping, page)) {
                                if (was_dirty)
                                        set_page_dirty(page);
                                ret = -EIO;
@@ -366,6 +395,7 @@ int invalidate_inode_pages2_range(struct address_space *mapping,
                pagevec_release(&pvec);
                cond_resched();
        }
+       WARN_ON_ONCE(ret);
        return ret;
 }
 EXPORT_SYMBOL_GPL(invalidate_inode_pages2_range);