[PATCH] eCryptfs: CIFS nlink fixes

When CIFS is the lower filesystem, the old lower dentry needs to be explicitly
dropped from inside eCryptfs to force a revalidate.  In addition, when CIFS is
the lower filesystem, the inode attributes need to be copied back up from the
lower inode to the eCryptfs inode on an eCryptfs revalidate.

Signed-off-by: Michael Halcrow <mhalcrow@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

fs/ecryptfs/dentry.c

@@ -57,6 +57,12 @@ static int ecryptfs_d_revalidate(struct dentry *dentry, struct nameidata *nd)
 	rc = lower_dentry->d_op->d_revalidate(lower_dentry, nd);
 	nd->dentry = dentry_save;
 	nd->mnt = vfsmount_save;
+	if (dentry->d_inode) {
+		struct inode *lower_inode =
+			ecryptfs_inode_to_lower(dentry->d_inode);
+
+		ecryptfs_copy_attr_all(dentry->d_inode, lower_inode);
+	}
 out:
 	return rc;
 }

fs/ecryptfs/inode.c

@@ -470,6 +470,7 @@ static int ecryptfs_link(struct dentry *old_dentry, struct inode *dir,
 	unlock_dir(lower_dir_dentry);
 	dput(lower_new_dentry);
 	dput(lower_old_dentry);
+	d_drop(lower_old_dentry);
 	d_drop(new_dentry);
 	d_drop(old_dentry);
 	return rc;
@@ -484,7 +485,7 @@ static int ecryptfs_unlink(struct inode *dir, struct dentry *dentry)
 	lock_parent(lower_dentry);
 	rc = vfs_unlink(lower_dir_inode, lower_dentry);
 	if (rc) {
-		ecryptfs_printk(KERN_ERR, "Error in vfs_unlink\n");
+		printk(KERN_ERR "Error in vfs_unlink; rc = [%d]\n", rc);
 		goto out_unlock;
 	}
 	ecryptfs_copy_attr_times(dir, lower_dir_inode);