From patchwork Thu Mar 30 06:21:12 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Qu Wenruo X-Patchwork-Id: 9652947 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 D1E26602BD for ; Thu, 30 Mar 2017 06:21:57 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id C30612856C for ; Thu, 30 Mar 2017 06:21:57 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id B7E8028571; Thu, 30 Mar 2017 06:21:57 +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 4F1E72856D for ; Thu, 30 Mar 2017 06:21:56 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932520AbdC3GVy (ORCPT ); Thu, 30 Mar 2017 02:21:54 -0400 Received: from cn.fujitsu.com ([59.151.112.132]:14536 "EHLO heian.cn.fujitsu.com" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S932445AbdC3GVc (ORCPT ); Thu, 30 Mar 2017 02:21:32 -0400 X-IronPort-AV: E=Sophos;i="5.22,518,1449504000"; d="scan'208";a="17165838" Received: from unknown (HELO cn.fujitsu.com) ([10.167.33.5]) by heian.cn.fujitsu.com with ESMTP; 30 Mar 2017 14:21:29 +0800 Received: from G08CNEXCHPEKD01.g08.fujitsu.local (unknown [10.167.33.80]) by cn.fujitsu.com (Postfix) with ESMTP id 15B9249F9A7D for ; Thu, 30 Mar 2017 14:21:28 +0800 (CST) Received: from localhost.localdomain (10.167.226.34) by G08CNEXCHPEKD01.g08.fujitsu.local (10.167.33.89) with Microsoft SMTP Server (TLS) id 14.3.319.2; Thu, 30 Mar 2017 14:21:28 +0800 From: Qu Wenruo To: Subject: [PATCH v3 16/19] btrfs-progs: scrub: Introduce function to recover data parity Date: Thu, 30 Mar 2017 14:21:12 +0800 Message-ID: <20170330062116.14379-17-quwenruo@cn.fujitsu.com> X-Mailer: git-send-email 2.12.1 In-Reply-To: <20170330062116.14379-1-quwenruo@cn.fujitsu.com> References: <20170330062116.14379-1-quwenruo@cn.fujitsu.com> MIME-Version: 1.0 X-Originating-IP: [10.167.226.34] X-yoursite-MailScanner-ID: 15B9249F9A7D.AF57B X-yoursite-MailScanner: Found to be clean X-yoursite-MailScanner-From: quwenruo@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 Introduce function, recover_from_parities(), to recover data stripes. It just wraps raid56_recov() with extra check functions to scrub_full_stripe structure. Signed-off-by: Qu Wenruo --- scrub.c | 51 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 51 insertions(+) diff --git a/scrub.c b/scrub.c index f718c738..a0f12380 100644 --- a/scrub.c +++ b/scrub.c @@ -565,3 +565,54 @@ out: free(ptrs); return ret; } + +/* + * Try to recover data stripe from P or Q stripe + * + * Return >0 if it can't be require any more. + * Return 0 for successful repair or no need to repair at all + * Return <0 for fatal error + */ +static int recover_from_parities(struct btrfs_fs_info *fs_info, + struct btrfs_scrub_progress *scrub_ctx, + struct scrub_full_stripe *fstripe) +{ + void **ptrs; + int nr_stripes = fstripe->nr_stripes; + int stripe_len = BTRFS_STRIPE_LEN; + int max_tolerance; + int i; + int ret; + + /* No need to recover */ + if (!fstripe->nr_corrupted_stripes) + return 0; + + /* Already recovered once, no more chance */ + if (fstripe->recovered) + return 1; + + if (fstripe->bg_type & BTRFS_BLOCK_GROUP_RAID5) + max_tolerance = 1; + else + max_tolerance = 2; + + /* Out of repair */ + if (fstripe->nr_corrupted_stripes > max_tolerance) + return 1; + + ptrs = malloc(sizeof(void *) * fstripe->nr_stripes); + if (!ptrs) + return -ENOMEM; + + /* Construct ptrs */ + for (i = 0; i < nr_stripes; i++) + ptrs[i] = fstripe->stripes[i].data; + + ret = raid56_recov(nr_stripes, stripe_len, fstripe->bg_type, + fstripe->corrupted_index[0], + fstripe->corrupted_index[1], ptrs); + fstripe->recovered = 1; + free(ptrs); + return ret; +}