From patchwork Wed Jul 12 08:49:57 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lu Fengqi X-Patchwork-Id: 9836347 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 19C4A602BD for ; Wed, 12 Jul 2017 08:51:15 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 0C99A237A5 for ; Wed, 12 Jul 2017 08:51:15 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 0172128552; Wed, 12 Jul 2017 08:51:14 +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 993A8237A5 for ; Wed, 12 Jul 2017 08:51:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755953AbdGLIvH (ORCPT ); Wed, 12 Jul 2017 04:51:07 -0400 Received: from cn.fujitsu.com ([59.151.112.132]:42656 "EHLO heian.cn.fujitsu.com" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1755889AbdGLIun (ORCPT ); Wed, 12 Jul 2017 04:50:43 -0400 X-IronPort-AV: E=Sophos;i="5.22,518,1449504000"; d="scan'208";a="21185019" Received: from unknown (HELO cn.fujitsu.com) ([10.167.33.5]) by heian.cn.fujitsu.com with ESMTP; 12 Jul 2017 16:50:30 +0800 Received: from G08CNEXCHPEKD01.g08.fujitsu.local (unknown [10.167.33.80]) by cn.fujitsu.com (Postfix) with ESMTP id DB0B746B5257; Wed, 12 Jul 2017 16:50:25 +0800 (CST) Received: from localhost.localdomain (10.167.226.155) by G08CNEXCHPEKD01.g08.fujitsu.local (10.167.33.89) with Microsoft SMTP Server (TLS) id 14.3.319.2; Wed, 12 Jul 2017 16:50:24 +0800 From: Lu Fengqi To: CC: Wang Xiaoguang , Qu Wenruo Subject: [PATCH v14.4 10/15] btrfs: dedupe: Implement btrfs_dedupe_calc_hash interface Date: Wed, 12 Jul 2017 16:49:57 +0800 Message-ID: <20170712085002.23241-11-lufq.fnst@cn.fujitsu.com> X-Mailer: git-send-email 2.13.2 In-Reply-To: <20170712085002.23241-1-lufq.fnst@cn.fujitsu.com> References: <20170712085002.23241-1-lufq.fnst@cn.fujitsu.com> MIME-Version: 1.0 X-Originating-IP: [10.167.226.155] X-yoursite-MailScanner-ID: DB0B746B5257.AEF95 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 | 47 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 47 insertions(+) diff --git a/fs/btrfs/dedupe.c b/fs/btrfs/dedupe.c index 890a08bf4152..6bdcff625533 100644 --- a/fs/btrfs/dedupe.c +++ b/fs/btrfs/dedupe.c @@ -639,3 +639,50 @@ 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 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_DESC_ON_STACK(sdesc, tfm); + + 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; + + sdesc->tfm = tfm; + sdesc->flags = 0; + ret = crypto_shash_init(sdesc); + 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(sdesc, d, sectorsize); + kunmap(p); + put_page(p); + if (ret) + return ret; + } + ret = crypto_shash_final(sdesc, hash->hash); + return ret; +}