From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-4.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 617B8FA372C for ; Wed, 16 Oct 2019 22:14:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 2BE4D21925 for ; Wed, 16 Oct 2019 22:14:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1571264089; bh=Cvg2PFZHPVa4AAS2swiVhNcTA6EzxWj+yJWCIgQ3vDc=; h=From:To:Cc:Subject:Date:List-ID:From; b=j9Ut5YHQ9KNnT+UCAMujad9Y50kQQXNBPrqJTwncH4JHx1xa202xIqbor2XegRTXA AkulFTSjBH0vJeLp6Zr0yjMYiNHxSpKZMsNYZ7NtHM/v6pPtY5EDLXBM8YUuVdVhKq PmbdBT81pTanWn/BJD0W1Yk6FafU27N1xsvOEalU= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2395244AbfJPWOq (ORCPT ); Wed, 16 Oct 2019 18:14:46 -0400 Received: from mail.kernel.org ([198.145.29.99]:38046 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2389800AbfJPWOp (ORCPT ); Wed, 16 Oct 2019 18:14:45 -0400 Received: from sol.localdomain (c-24-5-143-220.hsd1.ca.comcast.net [24.5.143.220]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id CE46E21925; Wed, 16 Oct 2019 22:14:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1571264085; bh=Cvg2PFZHPVa4AAS2swiVhNcTA6EzxWj+yJWCIgQ3vDc=; h=From:To:Cc:Subject:Date:From; b=WqQ6y51kgOkzvCHAZ517xjc/L5E4NpggyFQsAe7uBBXuQEEX7aV+RJP7T2hs/TYjV d6hwQ8jKlqhlwom3K2oGy9TFgIu1IIf/XPjNAqCNHCAEatdDhAuMZiutZKFPnO9zPe WAfs6n7cBWOnfOflB4wfU1LpB4kbEglU5eO8Ifcw= From: Eric Biggers To: linux-ext4@vger.kernel.org Cc: linux-fscrypt@vger.kernel.org, linux-fsdevel@vger.kernel.org, Chandan Rajendra Subject: [PATCH 0/2] ext4: support encryption with blocksize != PAGE_SIZE Date: Wed, 16 Oct 2019 15:11:40 -0700 Message-Id: <20191016221142.298754-1-ebiggers@kernel.org> X-Mailer: git-send-email 2.23.0 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org Hello, This patchset makes ext4 support encryption on filesystems where the filesystem block size is not equal to PAGE_SIZE. This allows e.g. PowerPC systems to use ext4 encryption. Most of the work for this was already done in prior kernel releases; now the only part missing is decryption support in block_read_full_page(). Chandan Rajendra has proposed a patchset "Consolidate FS read I/O callbacks code" [1] to address this and do various other things like make ext4 use mpage_readpages() again, and make ext4 and f2fs share more code. But it doesn't seem to be going anywhere. Therefore, I propose we simply add decryption support to block_read_full_page() for now. This is a fairly small change, and it gets ext4 encryption with subpage-sized blocks working. Note: to keep things simple I'm just allocating the work object from the bi_end_io function with GFP_ATOMIC. But if people think it's necessary, it could be changed to use preallocation like the page-based read path. Tested with 'gce-xfstests -c ext4/encrypt_1k -g auto', using the new "encrypt_1k" config I created. All tests pass except for those that already fail or are excluded with the encrypt or 1k configs, and 2 tests that try to create 1023-byte symlinks which fails since encrypted symlinks are limited to blocksize-3 bytes. Also ran the dedicated encryption tests using 'kvm-xfstests -c ext4/1k -g encrypt'; all pass, including the on-disk ciphertext verification tests. [1] https://lkml.kernel.org/linux-fsdevel/20190910155115.28550-1-chandan@linux.ibm.com/T/#u Chandan Rajendra (1): ext4: Enable encryption for subpage-sized blocks Eric Biggers (1): fs/buffer.c: support fscrypt in block_read_full_page() Documentation/filesystems/fscrypt.rst | 4 +-- fs/buffer.c | 47 ++++++++++++++++++++++++--- fs/ext4/super.c | 7 ---- 3 files changed, 44 insertions(+), 14 deletions(-) -- 2.23.0