From patchwork Thu May 25 06:22:02 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Qu Wenruo X-Patchwork-Id: 9747783 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 845266032C for ; Thu, 25 May 2017 06:23:28 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 851F5269E2 for ; Thu, 25 May 2017 06:23:28 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 79F0D27CF9; Thu, 25 May 2017 06:23:28 +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 2A76A269E2 for ; Thu, 25 May 2017 06:23:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1165198AbdEYGXZ (ORCPT ); Thu, 25 May 2017 02:23:25 -0400 Received: from cn.fujitsu.com ([59.151.112.132]:25075 "EHLO heian.cn.fujitsu.com" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1165157AbdEYGWo (ORCPT ); Thu, 25 May 2017 02:22:44 -0400 X-IronPort-AV: E=Sophos;i="5.22,518,1449504000"; d="scan'208";a="19288973" Received: from unknown (HELO cn.fujitsu.com) ([10.167.33.5]) by heian.cn.fujitsu.com with ESMTP; 25 May 2017 14:22:36 +0800 Received: from G08CNEXCHPEKD02.g08.fujitsu.local (unknown [10.167.33.83]) by cn.fujitsu.com (Postfix) with ESMTP id E267647C677F; Thu, 25 May 2017 14:22:32 +0800 (CST) Received: from localhost.localdomain (10.167.226.34) by G08CNEXCHPEKD02.g08.fujitsu.local (10.167.33.89) with Microsoft SMTP Server (TLS) id 14.3.319.2; Thu, 25 May 2017 14:22:32 +0800 From: Qu Wenruo To: CC: , Subject: [PATCH v4 17/20] btrfs-progs: scrub: Introduce helper to write a full stripe Date: Thu, 25 May 2017 14:22:02 +0800 Message-ID: <20170525062205.11660-18-quwenruo@cn.fujitsu.com> X-Mailer: git-send-email 2.13.0 In-Reply-To: <20170525062205.11660-1-quwenruo@cn.fujitsu.com> References: <20170525062205.11660-1-quwenruo@cn.fujitsu.com> MIME-Version: 1.0 X-Originating-IP: [10.167.226.34] X-yoursite-MailScanner-ID: E267647C677F.AEDF7 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 a internal helper, write_full_stripe() to calculate P/Q and write the whole full stripe. This is useful to recover RAID56 stripes. Signed-off-by: Qu Wenruo --- scrub.c | 44 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 44 insertions(+) diff --git a/scrub.c b/scrub.c index 3163cacb..94981f2b 100644 --- a/scrub.c +++ b/scrub.c @@ -876,3 +876,47 @@ static int recover_from_parities(struct btrfs_fs_info *fs_info, free(ptrs); return ret; } + +/* + * Helper to write a full stripe to disk + * P/Q will be re-calculated. + */ +static int write_full_stripe(struct scrub_full_stripe *fstripe) +{ + void **ptrs; + int nr_stripes = fstripe->nr_stripes; + int stripe_len = BTRFS_STRIPE_LEN; + int i; + int ret = 0; + + ptrs = malloc(sizeof(void *) * fstripe->nr_stripes); + if (!ptrs) + return -ENOMEM; + + for (i = 0; i < fstripe->nr_stripes; i++) + ptrs[i] = fstripe->stripes[i].data; + + if (fstripe->bg_type & BTRFS_BLOCK_GROUP_RAID6) { + raid6_gen_syndrome(nr_stripes, stripe_len, ptrs); + } else { + ret = raid5_gen_result(nr_stripes, stripe_len, nr_stripes - 1, + ptrs); + if (ret < 0) + goto out; + } + + for (i = 0; i < fstripe->nr_stripes; i++) { + struct scrub_stripe *stripe = &fstripe->stripes[i]; + + ret = pwrite(stripe->fd, stripe->data, fstripe->stripe_len, + stripe->physical); + if (ret != fstripe->stripe_len) { + ret = -EIO; + goto out; + } + } +out: + free(ptrs); + return ret; + +}