---

yaml
---
r: 133605
b: refs/heads/master
c: 9e80d40
h: refs/heads/master
i:
  133603: 53c243c
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 0384e2959127a56d0640505d004d8dd92f9c29f5
+refs/heads/master: 9e80d407736161d9b8b0c5a0d44f786e44c322ea

trunk/fs/ext3/inode.c

@@ -1435,6 +1435,10 @@ static int journal_dirty_data_fn(handle_t *handle, struct buffer_head *bh)
 	return 0;
 }
 
+static int buffer_unmapped(handle_t *handle, struct buffer_head *bh)
+{
+	return !buffer_mapped(bh);
+}
 /*
  * Note that we always start a transaction even if we're not journalling
  * data.  This is to preserve ordering: any hole instantiation within
@@ -1505,18 +1509,22 @@ static int ext3_ordered_writepage(struct page *page,
 	if (ext3_journal_current_handle())
 		goto out_fail;
 
+	if (!page_has_buffers(page)) {
+		create_empty_buffers(page, inode->i_sb->s_blocksize,
+				(1 << BH_Dirty)|(1 << BH_Uptodate));
+	} else if (!walk_page_buffers(NULL, page_buffers(page), 0, PAGE_CACHE_SIZE, NULL, buffer_unmapped)) {
+		/* Provide NULL instead of get_block so that we catch bugs if buffers weren't really mapped */
+		return block_write_full_page(page, NULL, wbc);
+	}
+	page_bufs = page_buffers(page);
+
 	handle = ext3_journal_start(inode, ext3_writepage_trans_blocks(inode));
 
 	if (IS_ERR(handle)) {
 		ret = PTR_ERR(handle);
 		goto out_fail;
 	}
 
-	if (!page_has_buffers(page)) {
-		create_empty_buffers(page, inode->i_sb->s_blocksize,
-				(1 << BH_Dirty)|(1 << BH_Uptodate));
-	}
-	page_bufs = page_buffers(page);
 	walk_page_buffers(handle, page_bufs, 0,
 			PAGE_CACHE_SIZE, NULL, bget_one);