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=-3.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS autolearn=ham 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 B2439C48BD5 for ; Tue, 25 Jun 2019 06:23:22 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 93D052085A for ; Tue, 25 Jun 2019 06:23:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729268AbfFYGXV (ORCPT ); Tue, 25 Jun 2019 02:23:21 -0400 Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:63916 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729260AbfFYGXV (ORCPT ); Tue, 25 Jun 2019 02:23:21 -0400 Received: from pps.filterd (m0098410.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.27/8.16.0.27) with SMTP id x5P6HCVC102334 for ; Tue, 25 Jun 2019 02:23:20 -0400 Received: from e06smtp02.uk.ibm.com (e06smtp02.uk.ibm.com [195.75.94.98]) by mx0a-001b2d01.pphosted.com with ESMTP id 2tbc92byyt-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for ; Tue, 25 Jun 2019 02:23:20 -0400 Received: from localhost by e06smtp02.uk.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! 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Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Tue, 25 Jun 2019 07:23:14 +0100 Received: from d06av26.portsmouth.uk.ibm.com (d06av26.portsmouth.uk.ibm.com [9.149.105.62]) by b06cxnps3075.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id x5P6NDtI51708146 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 25 Jun 2019 06:23:13 GMT Received: from d06av26.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 2AAD5AE045; Tue, 25 Jun 2019 06:23:13 +0000 (GMT) Received: from d06av26.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 83F5CAE057; Tue, 25 Jun 2019 06:23:11 +0000 (GMT) Received: from localhost.localdomain (unknown [9.124.35.58]) by d06av26.portsmouth.uk.ibm.com (Postfix) with ESMTP; Tue, 25 Jun 2019 06:23:11 +0000 (GMT) From: Chandan Rajendra To: Eric Biggers Cc: linux-fsdevel@vger.kernel.org, linux-ext4@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net, linux-fscrypt@vger.kernel.org, tytso@mit.edu, adilger.kernel@dilger.ca, jaegeuk@kernel.org, yuchao0@huawei.com, hch@infradead.org Subject: Re: [PATCH V3 6/7] Add decryption support for sub-pagesized blocks Date: Tue, 25 Jun 2019 11:52:43 +0530 Organization: IBM In-Reply-To: <20190621212916.GD167064@gmail.com> References: <20190616160813.24464-1-chandan@linux.ibm.com> <20190616160813.24464-7-chandan@linux.ibm.com> <20190621212916.GD167064@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 7Bit Content-Type: text/plain; charset="us-ascii" X-TM-AS-GCONF: 00 x-cbid: 19062506-0008-0000-0000-000002F6BFB8 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 19062506-0009-0000-0000-00002263EE89 Message-Id: <3201150.UV5xBNPoiD@localhost.localdomain> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2019-06-25_05:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=1 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1906250050 Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org On Saturday, June 22, 2019 2:59:17 AM IST Eric Biggers wrote: > On Sun, Jun 16, 2019 at 09:38:12PM +0530, Chandan Rajendra wrote: > > To support decryption of sub-pagesized blocks this commit adds code to, > > 1. Track buffer head in "struct read_callbacks_ctx". > > 2. Pass buffer head argument to all read callbacks. > > 3. Add new fscrypt helper to decrypt the file data referred to by a > > buffer head. > > > > Signed-off-by: Chandan Rajendra > > --- > > fs/buffer.c | 55 +++++++++------ > > fs/crypto/bio.c | 21 +++++- > > fs/f2fs/data.c | 2 +- > > fs/mpage.c | 2 +- > > fs/read_callbacks.c | 118 +++++++++++++++++++++++++-------- > > include/linux/buffer_head.h | 1 + > > include/linux/read_callbacks.h | 13 +++- > > 7 files changed, 158 insertions(+), 54 deletions(-) > > > > This is another patch that unnecessarily changes way too many components at > once. My suggestions elsewhere would resolve this, though: > > - This patch changes fs/f2fs/data.c and fs/mpage.c only to pass a NULL > buffer_head to read_callbacks_setup(). But as per my comments on patch 1, > read_callbacks_setup() should be split into read_callbacks_setup_bio() and > read_callbacks_end_bh(). > > - This patch changes fs/crypto/ only to add support for the buffer_head > decryption work. But as per my comments on patch 1, that should be in > read_callbacks.c instead. > > And adding buffer_head support to fs/read_callbacks.c should be its own patch, > *or* should simply be folded into the patch that adds fs/read_callbacks.c. > > Then the only thing remaining in this patch would be updating fs/buffer.c to > make it use the read_callbacks, which should be retitled to something like > "fs/buffer.c: add decryption support via read_callbacks". > I agree. -- chandan