From patchwork Thu Sep 14 08:12:50 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Eric Biggers X-Patchwork-Id: 13384794 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 12B99EDE98F for ; Thu, 14 Sep 2023 08:14:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236313AbjINIOy (ORCPT ); Thu, 14 Sep 2023 04:14:54 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56322 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235969AbjINIOx (ORCPT ); Thu, 14 Sep 2023 04:14:53 -0400 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id F22D0CD8; Thu, 14 Sep 2023 01:14:49 -0700 (PDT) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 65E8AC433C7; Thu, 14 Sep 2023 08:14:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1694679289; bh=O/fQUB0thzVERyyDJ+e34tB6NXJCmxw8lXP18CaGKeo=; h=From:To:Cc:Subject:Date:From; b=XXUmuSFI3jaRP/IM3nQ4JnvyjNh2qAOhASwCfGN1IJc6eJjrXLpDuCg/3ZRK0XZIj PFpUjNSLaAuzaHdHX3KqjtWOGoOw1pqq7H1hX2lo3clUMJ3Hq5Q+RZY621FubejTSP Dh2Z62Cf+OwrRofnkyC/mnCGfrVcW82/pgXrN5vRE9sZCwRAPBDRIgbVnSW1AscKx0 qnVUR+TBx4/yQhJ4uusXzvx8wg1uyXcrRP8jIXgrEbf3eBb2dChUkeuEIJ3i44gnGV dn/WYBhiU/WVI/fHFm4KWMQ+n7wCAX7LZDacnTqVfOvr354VtPtV1r2ZSb96qVxwNz efUYIl8JOfimg== From: Eric Biggers To: linux-fscrypt@vger.kernel.org Cc: linux-fsdevel@vger.kernel.org, linux-ext4@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net, linux-btrfs@vger.kernel.org, Jaegeuk Kim , Theodore Ts'o Subject: [PATCH v2 0/5] fscrypt: add support for data_unit_size < fs_block_size Date: Thu, 14 Sep 2023 01:12:50 -0700 Message-ID: <20230914081255.193502-1-ebiggers@kernel.org> X-Mailer: git-send-email 2.42.0 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-fscrypt@vger.kernel.org This patchset adds support for configuring the granularity of file contents encryption (a.k.a. the "crypto data unit size") to be less than the filesystem block size. The main use case for this is to support inline crypto hardware that only supports a data unit size that is less than the FS block size being used. Another possible use case is to support direct I/O on encrypted files without the FS block alignment restriction. Note that decreasing the crypto data unit size decreases efficiency, so this feature should only be used when necessary. For full details, see patch 5 which adds the actual feature. Patches 1-4 are preparatory patches. I've written an xfstest that verifies that when a sub-block data unit size is selected, the data on-disk is encrypted correctly with that data unit size. I'll be sending that out separately. Other testing of this patchset with xfstests has gone well, though it turns out a sub-block data unit size doesn't really work with IV_INO_LBLK_* yet (see patch 5). This patchset will cause some conflicts in the extent-based encryption patches that the btrfs folks are working on, as both are touching file contents encryption, but logically they are orthogonal features. This patchset is based on v6.6-rc1. Changed in v2: - Rebased onto v6.6-rc1 and took into account CephFS's recent addition of support for fscrypt - Narrowed the focus somewhat by dropping the attempted support for IV_INO_LBLK_32 and clearly documenting what is considered out of scope for now - Other cleanups Eric Biggers (5): fscrypt: make it extra clear that key_prefix is deprecated fscrypt: make the bounce page pool opt-in instead of opt-out fscrypt: use s_maxbytes instead of filesystem lblk_bits fscrypt: replace get_ino_and_lblk_bits with just has_32bit_inodes fscrypt: support crypto data unit size less than filesystem block size Documentation/filesystems/fscrypt.rst | 116 ++++++++++++++------ fs/ceph/crypto.c | 1 + fs/crypto/bio.c | 39 ++++--- fs/crypto/crypto.c | 148 +++++++++++++++----------- fs/crypto/fscrypt_private.h | 55 ++++++++-- fs/crypto/inline_crypt.c | 25 +++-- fs/crypto/keysetup.c | 3 + fs/crypto/keysetup_v1.c | 5 +- fs/crypto/policy.c | 75 ++++++++----- fs/ext4/crypto.c | 13 +-- fs/f2fs/super.c | 13 +-- fs/ubifs/crypto.c | 3 +- include/linux/fscrypt.h | 71 +++++++----- include/uapi/linux/fscrypt.h | 3 +- 14 files changed, 364 insertions(+), 206 deletions(-) base-commit: 0bb80ecc33a8fb5a682236443c1e740d5c917d1d