From patchwork Fri Feb 5 01:22:27 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Qu Wenruo X-Patchwork-Id: 8229781 Return-Path: X-Original-To: patchwork-linux-btrfs@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 9527B9FBF9 for ; Fri, 5 Feb 2016 01:26:06 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id BDDE52017E for ; Fri, 5 Feb 2016 01:26:05 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D0B6F20395 for ; Fri, 5 Feb 2016 01:26:04 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751532AbcBEBZI (ORCPT ); Thu, 4 Feb 2016 20:25:08 -0500 Received: from cn.fujitsu.com ([222.73.24.84]:27258 "EHLO song.cn.fujitsu.com" rhost-flags-OK-FAIL-OK-OK) by vger.kernel.org with ESMTP id S1751475AbcBEBY4 (ORCPT ); Thu, 4 Feb 2016 20:24:56 -0500 X-IronPort-AV: E=Sophos;i="5.20,367,1444665600"; d="scan'208";a="314593" Received: from unknown (HELO cn.fujitsu.com) ([10.167.250.3]) by song.cn.fujitsu.com with ESMTP; 05 Feb 2016 09:24:46 +0800 Received: from localhost.localdomain (unknown [10.167.226.34]) by cn.fujitsu.com (Postfix) with ESMTP id B6210405640D; Fri, 5 Feb 2016 09:24:40 +0800 (CST) From: Qu Wenruo To: linux-btrfs@vger.kernel.org Cc: Wang Xiaoguang Subject: [PATCH v6 07/19] btrfs: dedup: Implement btrfs_dedup_calc_hash interface Date: Fri, 5 Feb 2016 09:22:27 +0800 Message-Id: <1454635359-10013-8-git-send-email-quwenruo@cn.fujitsu.com> X-Mailer: git-send-email 2.7.0 In-Reply-To: <1454635359-10013-1-git-send-email-quwenruo@cn.fujitsu.com> References: <1454635359-10013-1-git-send-email-quwenruo@cn.fujitsu.com> MIME-Version: 1.0 X-yoursite-MailScanner-ID: B6210405640D.AA0BD X-yoursite-MailScanner: Found to be clean X-yoursite-MailScanner-From: quwenruo@cn.fujitsu.com X-Spam-Status: No, score=-7.4 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=ham version=3.3.1 Sender: linux-btrfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Wang Xiaoguang Unlike in-memory or on-disk dedup method, only SHA256 hash method is supported yet, so implement btrfs_dedup_calc_hash() interface using SHA256. Signed-off-by: Qu Wenruo Signed-off-by: Wang Xiaoguang --- fs/btrfs/dedup.c | 49 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 49 insertions(+) diff --git a/fs/btrfs/dedup.c b/fs/btrfs/dedup.c index dbcfcc9..9777355 100644 --- a/fs/btrfs/dedup.c +++ b/fs/btrfs/dedup.c @@ -543,3 +543,52 @@ int btrfs_dedup_search(struct btrfs_fs_info *fs_info, } return ret; } + +int btrfs_dedup_calc_hash(struct btrfs_fs_info *fs_info, + struct inode *inode, u64 start, + struct btrfs_dedup_hash *hash) +{ + int i; + int ret; + struct page *p; + struct btrfs_dedup_info *dedup_info = fs_info->dedup_info; + struct crypto_shash *tfm = dedup_info->dedup_driver; + struct { + struct shash_desc desc; + char ctx[crypto_shash_descsize(tfm)]; + } sdesc; + u64 dedup_bs; + u64 sectorsize = BTRFS_I(inode)->root->sectorsize; + + if (!fs_info->dedup_enabled || !hash) + return 0; + + if (WARN_ON(dedup_info == NULL)) + return -EINVAL; + + WARN_ON(!IS_ALIGNED(start, sectorsize)); + + dedup_bs = dedup_info->blocksize; + + sdesc.desc.tfm = tfm; + sdesc.desc.flags = 0; + ret = crypto_shash_init(&sdesc.desc); + if (ret) + return ret; + for (i = 0; sectorsize * i < dedup_bs; i++) { + char *d; + + p = find_get_page(inode->i_mapping, + (start >> PAGE_CACHE_SHIFT) + i); + if (WARN_ON(!p)) + return -ENOENT; + d = kmap(p); + ret = crypto_shash_update(&sdesc.desc, d, sectorsize); + kunmap(p); + page_cache_release(p); + if (ret) + return ret; + } + ret = crypto_shash_final(&sdesc.desc, hash->hash); + return ret; +}