From patchwork Tue May 22 16:01:09 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Chandan Rajendra X-Patchwork-Id: 918413 Return-Path: X-Original-To: patchwork-incoming@ozlabs.org Delivered-To: patchwork-incoming@ozlabs.org Authentication-Results: ozlabs.org; spf=none (mailfrom) smtp.mailfrom=vger.kernel.org (client-ip=209.132.180.67; helo=vger.kernel.org; envelope-from=linux-ext4-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=linux.vnet.ibm.com Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 40r0jb0Xq0z9s0y for ; Wed, 23 May 2018 02:00:35 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751726AbeEVQAd (ORCPT ); Tue, 22 May 2018 12:00:33 -0400 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:1853 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751652AbeEVQA3 (ORCPT ); Tue, 22 May 2018 12:00:29 -0400 Received: from pps.filterd (m0098417.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.22/8.16.0.22) with SMTP id w4MFxKcc100787 for ; Tue, 22 May 2018 12:00:29 -0400 Received: from e37.co.us.ibm.com (e37.co.us.ibm.com [32.97.110.158]) by mx0a-001b2d01.pphosted.com with ESMTP id 2j4nwj1gad-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for ; Tue, 22 May 2018 12:00:27 -0400 Received: from localhost by e37.co.us.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! 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Violators will be prosecuted; Tue, 22 May 2018 10:00:23 -0600 Received: from b03ledav003.gho.boulder.ibm.com (b03ledav003.gho.boulder.ibm.com [9.17.130.234]) by b03cxnp08025.gho.boulder.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id w4MG0MkI7930156; Tue, 22 May 2018 09:00:22 -0700 Received: from b03ledav003.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 40D9D6A03B; Tue, 22 May 2018 10:00:22 -0600 (MDT) Received: from localhost.localdomain.com (unknown [9.85.71.81]) by b03ledav003.gho.boulder.ibm.com (Postfix) with ESMTP id 175056A045; Tue, 22 May 2018 10:00:19 -0600 (MDT) From: Chandan Rajendra To: linux-fscrypt@vger.kernel.org Cc: Chandan Rajendra , ebiggers3@gmail.com, tytso@mit.edu, linux-ext4@vger.kernel.org, linux-fsdevel@vger.kernel.org Subject: [RFC PATCH V3 11/12] ext4: Move encryption code into its own function Date: Tue, 22 May 2018 21:31:09 +0530 X-Mailer: git-send-email 2.9.5 In-Reply-To: <20180522160110.1161-1-chandan@linux.vnet.ibm.com> References: <20180522160110.1161-1-chandan@linux.vnet.ibm.com> X-TM-AS-GCONF: 00 x-cbid: 18052216-0024-0000-0000-000018757F4D X-IBM-SpamModules-Scores: X-IBM-SpamModules-Versions: BY=3.00009066; HX=3.00000241; KW=3.00000007; PH=3.00000004; SC=3.00000261; SDB=6.01036073; UDB=6.00529992; IPR=6.00815201; MB=3.00021242; MTD=3.00000008; XFM=3.00000015; UTC=2018-05-22 16:00:25 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 18052216-0025-0000-0000-00005019E686 Message-Id: <20180522160110.1161-12-chandan@linux.vnet.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:, , definitions=2018-05-22_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-1805220177 Sender: linux-ext4-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-ext4@vger.kernel.org This commit makes the encryption code in ext4 to be self-contained by moving the invocation of fscrypt_encrypt_page() and the corresponding "retry encryption on ENOMEM" code to a function of its own. Signed-off-by: Chandan Rajendra --- fs/ext4/page-io.c | 45 ++++++++++++++++++++++++++++----------------- 1 file changed, 28 insertions(+), 17 deletions(-) diff --git a/fs/ext4/page-io.c b/fs/ext4/page-io.c index 52f9218..55e52d8 100644 --- a/fs/ext4/page-io.c +++ b/fs/ext4/page-io.c @@ -409,6 +409,33 @@ static int io_submit_add_bh(struct ext4_io_submit *io, return 0; } +static struct page * +encrypt_page(struct ext4_io_submit *io, struct inode *inode, + struct page *page, int len, struct writeback_control *wbc) +{ + struct page *data_page; + gfp_t gfp_flags = GFP_NOFS; + u64 blk_nr; + + blk_nr = page->index << (PAGE_SHIFT - inode->i_blkbits); + +retry_encrypt: + len = roundup(len, i_blocksize(inode)); + data_page = fscrypt_encrypt_page(inode, page, len, 0, blk_nr, + gfp_flags); + if (IS_ERR(data_page) && PTR_ERR(data_page) == -ENOMEM + && wbc->sync_mode == WB_SYNC_ALL) { + if (io->io_bio) { + ext4_io_submit(io); + congestion_wait(BLK_RW_ASYNC, HZ/50); + } + gfp_flags |= __GFP_NOFAIL; + goto retry_encrypt; + } + + return data_page; +} + int ext4_bio_write_page(struct ext4_io_submit *io, struct page *page, int len, @@ -479,25 +506,9 @@ int ext4_bio_write_page(struct ext4_io_submit *io, if (ext4_encrypted_inode(inode) && S_ISREG(inode->i_mode) && nr_to_submit) { - gfp_t gfp_flags = GFP_NOFS; - u64 blk_nr; - - blk_nr = page->index << (PAGE_SHIFT - inode->i_blkbits); - - retry_encrypt: - len = roundup(len, i_blocksize(inode)); - data_page = fscrypt_encrypt_page(inode, page, len, 0, blk_nr, - gfp_flags); + data_page = encrypt_page(io, inode, page, len, wbc); if (IS_ERR(data_page)) { ret = PTR_ERR(data_page); - if (ret == -ENOMEM && wbc->sync_mode == WB_SYNC_ALL) { - if (io->io_bio) { - ext4_io_submit(io); - congestion_wait(BLK_RW_ASYNC, HZ/50); - } - gfp_flags |= __GFP_NOFAIL; - goto retry_encrypt; - } data_page = NULL; goto out; }