please, remove the abuse of vfs_path_lookup() in ecryptfs

Al Viro
2011-02-17T01:53:57Z

commit 21edad32205e97dc7ccb81a85234c77e760364c8 (
ecryptfs: dont call lookup_one_len to avoid NULL nameidata) is badly
misguided. The last thing we need is extra places where nameidata is
passed around.

The current code is simply wrong - it's bypassing dcache
lookups in new_lower_dentry(). Besides, abuse of vfs_path_lookup()
here is a Bad Idea(tm). No, filesystems are *not* allowed to die
if ->d_revalidate()/->lookup()/->create() are called with NULL
nameidata. Eventually these methods will lose nameidata * anyway -
starting with ->d_revalidate() in the next cycle at the latest
(i.e. if we run into something really stinky in RCU mess, it might
happen before -final).

Please revert that.