ext4: switch to fscrypt_prepare_lookup()

Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>

fs/ext4/namei.c

@@ -1538,24 +1538,14 @@ static struct dentry *ext4_lookup(struct inode *dir, struct dentry *dentry, unsi
 	struct inode *inode;
 	struct ext4_dir_entry_2 *de;
 	struct buffer_head *bh;
+	int err;
 
-	if (ext4_encrypted_inode(dir)) {
+	err = fscrypt_prepare_lookup(dir, dentry, flags);
-		int res = fscrypt_get_encryption_info(dir);
+	if (err)
+		return ERR_PTR(err);
 
-		/*
+	if (dentry->d_name.len > EXT4_NAME_LEN)
-		 * DCACHE_ENCRYPTED_WITH_KEY is set if the dentry is
+		return ERR_PTR(-ENAMETOOLONG);
-		 * created while the directory was encrypted and we
-		 * have access to the key.
-		 */
-		if (fscrypt_has_encryption_key(dir))
-			fscrypt_set_encrypted_dentry(dentry);
-		fscrypt_set_d_op(dentry);
-		if (res && res != -ENOKEY)
-			return ERR_PTR(res);
-	}
-
-       if (dentry->d_name.len > EXT4_NAME_LEN)
-	       return ERR_PTR(-ENAMETOOLONG);
 
 	bh = ext4_find_entry(dir, &dentry->d_name, &de, NULL);
 	if (IS_ERR(bh))