From patchwork Fri Oct 28 02:31:52 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Qu Wenruo X-Patchwork-Id: 9400903 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 9AF8260588 for ; Fri, 28 Oct 2016 02:32:48 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 88D3B2A0FF for ; Fri, 28 Oct 2016 02:32:48 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 7C0B42A130; Fri, 28 Oct 2016 02:32:48 +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 329312A0FF for ; Fri, 28 Oct 2016 02:32:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S965952AbcJ1Cco (ORCPT ); Thu, 27 Oct 2016 22:32:44 -0400 Received: from cn.fujitsu.com ([222.73.24.84]:48358 "EHLO song.cn.fujitsu.com" rhost-flags-OK-FAIL-OK-OK) by vger.kernel.org with ESMTP id S965908AbcJ1Ccn (ORCPT ); Thu, 27 Oct 2016 22:32:43 -0400 X-IronPort-AV: E=Sophos;i="5.20,367,1444665600"; d="scan'208";a="932114" Received: from unknown (HELO cn.fujitsu.com) ([10.167.250.3]) by song.cn.fujitsu.com with ESMTP; 28 Oct 2016 10:32:04 +0800 Received: from adam-work.localdomain (unknown [10.167.226.34]) by cn.fujitsu.com (Postfix) with ESMTP id 3B65041B4BCF; Fri, 28 Oct 2016 10:32:04 +0800 (CST) From: Qu Wenruo To: linux-btrfs@vger.kernel.org, dsterba@suse.cz Subject: [PATCH 16/19] btrfs-progs: check/scrub: Introduce function to recover data parity Date: Fri, 28 Oct 2016 10:31:52 +0800 Message-Id: <20161028023155.27336-17-quwenruo@cn.fujitsu.com> X-Mailer: git-send-email 2.10.1 In-Reply-To: <20161028023155.27336-1-quwenruo@cn.fujitsu.com> References: <20161028023155.27336-1-quwenruo@cn.fujitsu.com> MIME-Version: 1.0 X-yoursite-MailScanner-ID: 3B65041B4BCF.ACFF5 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. However this function only support RAID5 yet, but should be good enough for the scrub framework. Signed-off-by: Qu Wenruo --- check/scrub.c | 49 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 49 insertions(+) diff --git a/check/scrub.c b/check/scrub.c index 7aeda88..7a8b783 100644 --- a/check/scrub.c +++ b/check/scrub.c @@ -495,3 +495,52 @@ out: free(ptrs); return ret; } + +/* + * Return >0 if out of repair + * 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; +}