From patchwork Mon Feb 12 09:43:40 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Chandan Rajendra X-Patchwork-Id: 10212047 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 2B02760605 for ; Mon, 12 Feb 2018 09:43:04 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 1CEDB28334 for ; Mon, 12 Feb 2018 09:43:04 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 11C1A28922; Mon, 12 Feb 2018 09:43:04 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id B61C828334 for ; Mon, 12 Feb 2018 09:43:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933057AbeBLJmw (ORCPT ); Mon, 12 Feb 2018 04:42:52 -0500 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:47282 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1753948AbeBLJmm (ORCPT ); Mon, 12 Feb 2018 04:42:42 -0500 Received: from pps.filterd (m0098419.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.16.0.22/8.16.0.22) with SMTP id w1C9d3ci039069 for ; Mon, 12 Feb 2018 04:42:41 -0500 Received: from e33.co.us.ibm.com (e33.co.us.ibm.com [32.97.110.151]) by mx0b-001b2d01.pphosted.com with ESMTP id 2g3552qfkm-1 (version=TLSv1.2 cipher=AES256-SHA bits=256 verify=NOT) for ; Mon, 12 Feb 2018 04:42:41 -0500 Received: from localhost by e33.co.us.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! 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Violators will be prosecuted; Mon, 12 Feb 2018 02:42:39 -0700 Received: from b03ledav002.gho.boulder.ibm.com (b03ledav002.gho.boulder.ibm.com [9.17.130.233]) by b03cxnp08025.gho.boulder.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id w1C9gbJJ13828388; Mon, 12 Feb 2018 02:42:38 -0700 Received: from b03ledav002.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 8B14C13603A; Mon, 12 Feb 2018 02:42:38 -0700 (MST) Received: from localhost.in.ibm.com (unknown [9.124.35.142]) by b03ledav002.gho.boulder.ibm.com (Postfix) with ESMTP id 6440E136043; Mon, 12 Feb 2018 02:42:36 -0700 (MST) From: Chandan Rajendra To: linux-ext4@vger.kernel.org Cc: Chandan Rajendra , linux-fsdevel@vger.kernel.org, ebiggers3@gmail.com, linux-fscrypt@vger.kernel.org, tytso@mit.edu Subject: [RFC PATCH V2 04/11] completion_pages: Decrypt all contiguous blocks in a page Date: Mon, 12 Feb 2018 15:13:40 +0530 X-Mailer: git-send-email 2.9.5 In-Reply-To: <20180212094347.22071-1-chandan@linux.vnet.ibm.com> References: <20180212094347.22071-1-chandan@linux.vnet.ibm.com> X-TM-AS-GCONF: 00 x-cbid: 18021209-0008-0000-0000-0000094D152D X-IBM-SpamModules-Scores: X-IBM-SpamModules-Versions: BY=3.00008521; HX=3.00000241; KW=3.00000007; PH=3.00000004; SC=3.00000251; SDB=6.00988573; UDB=6.00501891; IPR=6.00767927; BA=6.00005825; NDR=6.00000001; ZLA=6.00000005; ZF=6.00000009; ZB=6.00000000; ZP=6.00000000; ZH=6.00000000; ZU=6.00000002; MB=3.00019505; XFM=3.00000015; UTC=2018-02-12 09:42:40 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 18021209-0009-0000-0000-000045F11A6A Message-Id: <20180212094347.22071-5-chandan@linux.vnet.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:, , definitions=2018-02-12_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 impostorscore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1709140000 definitions=main-1802120125 Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP With blocksize < pagesize, a page can contain more than one block. Hence this commit changes completion_pages() to invoke fscrypt_decrypt_block() for all the contiguous blocks mapped by the page. Signed-off-by: Chandan Rajendra --- fs/crypto/bio.c | 19 +++++++++++++++++-- 1 file changed, 17 insertions(+), 2 deletions(-) diff --git a/fs/crypto/bio.c b/fs/crypto/bio.c index efb0734..378df08 100644 --- a/fs/crypto/bio.c +++ b/fs/crypto/bio.c @@ -40,8 +40,23 @@ static void completion_pages(struct work_struct *work) bio_for_each_segment_all(bv, bio, i) { struct page *page = bv->bv_page; - int ret = fscrypt_decrypt_block(page->mapping->host, page, - PAGE_SIZE, 0, page->index); + struct inode *inode = page->mapping->host; + const unsigned long blocksize = inode->i_sb->s_blocksize; + const unsigned int blkbits = inode->i_blkbits; + u64 page_blk = page->index << (PAGE_SHIFT - blkbits); + u64 blk = page_blk + (bv->bv_offset >> blkbits); + int nr_blks = bv->bv_len >> blkbits; + int ret = 0; + int j; + + for (j = 0; j < nr_blks; j++, blk++) { + ret = fscrypt_decrypt_block(page->mapping->host, + page, blocksize, + bv->bv_offset + (j << blkbits), + blk); + if (ret) + break; + } if (ret) { WARN_ON_ONCE(1);