[PATCH 2.6.25-rc3-mm1] fix ext2 borkage

[Hugh Dickins <hugh@veritas.com>]

use-page_cache_xxx-in-ext2.patch gave me lots of EXT2-fs error (device
loop0): ext2_find_entry: dir 52629 size 5120 exceeds block count 2
so I stopped it quickly.  Creating a directory entry was muddling up the
directory and the linked inode, writing directory page out to the latter.

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

 fs/ext2/dir.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- 2.6.25-rc3-mm1/fs/ext2/dir.c	2008-03-04 11:37:47.000000000 +0000
+++ linux/fs/ext2/dir.c	2008-03-04 18:25:24.000000000 +0000
@@ -472,7 +472,7 @@ void ext2_set_link(struct inode *dir, st
 int ext2_add_link (struct dentry *dentry, struct inode *inode)
 {
 	struct inode *dir = dentry->d_parent->d_inode;
-	struct address_space *mapping = inode->i_mapping;
+	struct address_space *mapping = dir->i_mapping;
 	const char *name = dentry->d_name.name;
 	int namelen = dentry->d_name.len;
 	unsigned chunk_size = ext2_chunk_size(dir);