From patchwork Thu Jul 12 01:25:48 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lu Fengqi X-Patchwork-Id: 10520793 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 A0403600CA for ; Thu, 12 Jul 2018 01:26:17 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 88FAA29429 for ; Thu, 12 Jul 2018 01:26:17 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 7DB2529433; Thu, 12 Jul 2018 01:26:17 +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=-7.9 required=2.0 tests=BAYES_00, MAILING_LIST_MULTI, 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 29EC229429 for ; Thu, 12 Jul 2018 01:26:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2403845AbeGLBdR (ORCPT ); Wed, 11 Jul 2018 21:33:17 -0400 Received: from mail.cn.fujitsu.com ([183.91.158.132]:2241 "EHLO heian.cn.fujitsu.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S2403839AbeGLBdR (ORCPT ); Wed, 11 Jul 2018 21:33:17 -0400 X-IronPort-AV: E=Sophos;i="5.43,368,1503331200"; d="scan'208";a="42141357" Received: from unknown (HELO cn.fujitsu.com) ([10.167.33.5]) by heian.cn.fujitsu.com with ESMTP; 12 Jul 2018 09:26:16 +0800 Received: from G08CNEXCHPEKD02.g08.fujitsu.local (unknown [10.167.33.83]) by cn.fujitsu.com (Postfix) with ESMTP id 07CF24B473E7; Thu, 12 Jul 2018 09:26:12 +0800 (CST) Received: from fnst.localdomain (10.167.226.155) by G08CNEXCHPEKD02.g08.fujitsu.local (10.167.33.89) with Microsoft SMTP Server (TLS) id 14.3.399.0; Thu, 12 Jul 2018 09:26:18 +0800 From: Lu Fengqi To: CC: Wang Xiaoguang , Qu Wenruo Subject: [PATCH v14.8 09/14] btrfs: dedupe: Implement btrfs_dedupe_calc_hash interface Date: Thu, 12 Jul 2018 09:25:48 +0800 Message-ID: <20180712012553.29431-10-lufq.fnst@cn.fujitsu.com> X-Mailer: git-send-email 2.18.0 In-Reply-To: <20180712012553.29431-1-lufq.fnst@cn.fujitsu.com> References: <20180712012553.29431-1-lufq.fnst@cn.fujitsu.com> MIME-Version: 1.0 X-Originating-IP: [10.167.226.155] X-yoursite-MailScanner-ID: 07CF24B473E7.AD5A3 X-yoursite-MailScanner: Found to be clean X-yoursite-MailScanner-From: lufq.fnst@cn.fujitsu.com Sender: linux-btrfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Wang Xiaoguang Unlike in-memory or on-disk dedupe method, only SHA256 hash method is supported yet, so implement btrfs_dedupe_calc_hash() interface using SHA256. Signed-off-by: Qu Wenruo Signed-off-by: Wang Xiaoguang Reviewed-by: Josef Bacik Signed-off-by: Lu Fengqi --- fs/btrfs/dedupe.c | 50 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 50 insertions(+) diff --git a/fs/btrfs/dedupe.c b/fs/btrfs/dedupe.c index e3084deb1eb7..14c8d245480e 100644 --- a/fs/btrfs/dedupe.c +++ b/fs/btrfs/dedupe.c @@ -651,3 +651,53 @@ int btrfs_dedupe_search(struct btrfs_fs_info *fs_info, } return ret; } + +int btrfs_dedupe_calc_hash(struct btrfs_fs_info *fs_info, + struct inode *inode, u64 start, + struct btrfs_dedupe_hash *hash) +{ + int i; + int ret; + struct page *p; + struct shash_desc *shash; + struct btrfs_dedupe_info *dedupe_info = fs_info->dedupe_info; + struct crypto_shash *tfm = dedupe_info->dedupe_driver; + u64 dedupe_bs; + u64 sectorsize = fs_info->sectorsize; + + shash = kmalloc(sizeof(*shash) + crypto_shash_descsize(tfm), GFP_NOFS); + if (!shash) + return -ENOMEM; + + if (!fs_info->dedupe_enabled || !hash) + return 0; + + if (WARN_ON(dedupe_info == NULL)) + return -EINVAL; + + WARN_ON(!IS_ALIGNED(start, sectorsize)); + + dedupe_bs = dedupe_info->blocksize; + + shash->tfm = tfm; + shash->flags = 0; + ret = crypto_shash_init(shash); + if (ret) + return ret; + for (i = 0; sectorsize * i < dedupe_bs; i++) { + char *d; + + p = find_get_page(inode->i_mapping, + (start >> PAGE_SHIFT) + i); + if (WARN_ON(!p)) + return -ENOENT; + d = kmap(p); + ret = crypto_shash_update(shash, d, sectorsize); + kunmap(p); + put_page(p); + if (ret) + return ret; + } + ret = crypto_shash_final(shash, hash->hash); + return ret; +}