From patchwork Tue Jul 12 07:03:27 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 12914572 X-Patchwork-Delegate: song@kernel.org Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id BB94EC43334 for ; Tue, 12 Jul 2022 07:03:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232304AbiGLHD5 (ORCPT ); Tue, 12 Jul 2022 03:03:57 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46252 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232289AbiGLHDw (ORCPT ); Tue, 12 Jul 2022 03:03:52 -0400 Received: from bombadil.infradead.org (bombadil.infradead.org [IPv6:2607:7c80:54:3::133]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 057A821E02; Tue, 12 Jul 2022 00:03:47 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20210309; h=Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender :Reply-To:Content-Type:Content-ID:Content-Description; bh=VGBCvWFSyJvzGUFgHbFC3CnRikHS4RrW+fJyeHkRqMk=; b=GnT9qOcgCICxDLpQWRYvUKIg5P 9BxdHy4vm08m6bBUofzw9Zx12ccKcN/FgmMowsSLlz8P7yUTZqRkuhkgTG9fmF5MQ00FcTUn8H/kn CL216P6aZ8OR9fAN4oGvSZ2ny6rYCkArZGzN4kwk/0fKOwksF85jFOqmV8X1gYHU5C465EkXJ6K2B QFpW5Y1sTxZ4cyPI9fpoGwjLyC2Q7RjTe7Uk29qLmPRuHT30ok0LEKVotsZjTTBftRPepVea41SfL CftWZzjfjc05/MJukm2KqRTA/rBuNOYT4ahsjSgC4Gkdgbu8bD2RiNyxYCSn7VDDtNteyvDdoG4AR CWbxHjFg==; Received: from ip4d15c27d.dynamic.kabel-deutschland.de ([77.21.194.125] helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1oB9vt-008DWd-F5; Tue, 12 Jul 2022 07:03:45 +0000 From: Christoph Hellwig To: Song Liu Cc: Logan Gunthorpe , linux-raid@vger.kernel.org, linux-block@vger.kernel.org Subject: [PATCH 4/8] md: stop using for_each_mddev in md_do_sync Date: Tue, 12 Jul 2022 09:03:27 +0200 Message-Id: <20220712070331.1390700-5-hch@lst.de> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20220712070331.1390700-1-hch@lst.de> References: <20220712070331.1390700-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-raid@vger.kernel.org Just do a plain list_for_each that only grabs a mddev reference in the case where the thread sleeps and restarts the list iteration. Signed-off-by: Christoph Hellwig --- drivers/md/md.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/drivers/md/md.c b/drivers/md/md.c index 61eceef17d5fd..d22608dcb25fe 100644 --- a/drivers/md/md.c +++ b/drivers/md/md.c @@ -8683,7 +8683,6 @@ void md_do_sync(struct md_thread *thread) unsigned long update_time; sector_t mark_cnt[SYNC_MARKS]; int last_mark,m; - struct list_head *tmp; sector_t last_check; int skipped = 0; struct md_rdev *rdev; @@ -8753,7 +8752,8 @@ void md_do_sync(struct md_thread *thread) try_again: if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) goto skip; - for_each_mddev(mddev2, tmp) { + spin_lock(&all_mddevs_lock); + list_for_each_entry(mddev2, &all_mddevs, all_mddevs) { if (mddev2 == mddev) continue; if (!mddev->parallel_resync @@ -8783,7 +8783,8 @@ void md_do_sync(struct md_thread *thread) desc, mdname(mddev), mdname(mddev2)); } - mddev_put(mddev2); + spin_unlock(&all_mddevs_lock); + if (signal_pending(current)) flush_signals(current); schedule(); @@ -8793,6 +8794,7 @@ void md_do_sync(struct md_thread *thread) finish_wait(&resync_wait, &wq); } } + spin_unlock(&all_mddevs_lock); } while (mddev->curr_resync < 2); j = 0;