From patchwork Tue Jan 26 14:52:44 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 12047157 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9B140C433E9 for ; Tue, 26 Jan 2021 15:23:09 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6B04E2311B for ; Tue, 26 Jan 2021 15:23:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2391796AbhAZPXG (ORCPT ); Tue, 26 Jan 2021 10:23:06 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57116 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2406330AbhAZPW4 (ORCPT ); Tue, 26 Jan 2021 10:22:56 -0500 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id AA48CC061A29; Tue, 26 Jan 2021 07:22:15 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; 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=f0VB07mdqOWmqrSUWksOrW1/tOJIZooJI1RGwrnSP1g=; b=wYGytAGz504DGBR0OQvEpSGo49 2JdJ3gnCfCQl1vwNpmdVhDxHbx+ZmO0AnoppdLH4OS7wuSWjiTRLFcAdIsHiIiaaGhcFJpdnDwdDD Qd1JnCAwW6br1SDLkqBeyRwDqUbw5gNqXxt5KDFpCodoxq6hkP1X4WXCAwl0X208GB/Q8MyX3OGZV w45G0QGuCRcfbcuzk2uK6tgo9j0HRaREGMAvY/f8RxriCxk2j+sxH/hcXgvMowOXL5t+95RBtSIL9 94mzmX/aWv0W4VcAok5uc1g5wTmUXSGYr7X1JCQqdSPgz47uJEitWn/3NozsKFWnQ3tSwLSAt5eXw MVD8d2Hg==; Received: from [2001:4bb8:191:e347:5918:ac86:61cb:8801] (helo=localhost) by casper.infradead.org with esmtpsa (Exim 4.94 #2 (Red Hat Linux)) id 1l4Q5i-005oNB-Sc; Tue, 26 Jan 2021 15:17:53 +0000 From: Christoph Hellwig To: Jens Axboe , Song Liu Cc: Jaegeuk Kim , Chao Yu , Philipp Reisner , Lars Ellenberg , Coly Li , Mike Snitzer , Josef Bacik , David Sterba , Damien Le Moal , Naohiro Aota , Andrew Morton , Ryusuke Konishi , linux-nilfs@vger.kernel.org, dm-devel@redhat.com, linux-f2fs-devel@lists.sourceforge.net, linux-block@vger.kernel.org, drbd-dev@lists.linbit.com, linux-bcache@vger.kernel.org, linux-raid@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-btrfs@vger.kernel.org, linux-nfs@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 14/17] md/raid6: refactor raid5_read_one_chunk Date: Tue, 26 Jan 2021 15:52:44 +0100 Message-Id: <20210126145247.1964410-15-hch@lst.de> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20210126145247.1964410-1-hch@lst.de> References: <20210126145247.1964410-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org Refactor raid5_read_one_chunk so that all simple checks are done before allocating the bio. Signed-off-by: Christoph Hellwig Acked-by: Song Liu --- drivers/md/raid5.c | 108 +++++++++++++++++++-------------------------- 1 file changed, 45 insertions(+), 63 deletions(-) diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c index f411b9e5c332f4..a348b2adf2a9f9 100644 --- a/drivers/md/raid5.c +++ b/drivers/md/raid5.c @@ -5393,90 +5393,72 @@ static void raid5_align_endio(struct bio *bi) static int raid5_read_one_chunk(struct mddev *mddev, struct bio *raid_bio) { struct r5conf *conf = mddev->private; - int dd_idx; - struct bio* align_bi; + struct bio *align_bio; struct md_rdev *rdev; - sector_t end_sector; + sector_t sector, end_sector, first_bad; + int bad_sectors, dd_idx; if (!in_chunk_boundary(mddev, raid_bio)) { pr_debug("%s: non aligned\n", __func__); return 0; } - /* - * use bio_clone_fast to make a copy of the bio - */ - align_bi = bio_clone_fast(raid_bio, GFP_NOIO, &mddev->bio_set); - if (!align_bi) - return 0; - /* - * set bi_end_io to a new function, and set bi_private to the - * original bio. - */ - align_bi->bi_end_io = raid5_align_endio; - align_bi->bi_private = raid_bio; - /* - * compute position - */ - align_bi->bi_iter.bi_sector = - raid5_compute_sector(conf, raid_bio->bi_iter.bi_sector, - 0, &dd_idx, NULL); - end_sector = bio_end_sector(align_bi); + sector = raid5_compute_sector(conf, raid_bio->bi_iter.bi_sector, 0, + &dd_idx, NULL); + end_sector = bio_end_sector(raid_bio); + rcu_read_lock(); + if (r5c_big_stripe_cached(conf, sector)) + goto out_rcu_unlock; + rdev = rcu_dereference(conf->disks[dd_idx].replacement); if (!rdev || test_bit(Faulty, &rdev->flags) || rdev->recovery_offset < end_sector) { rdev = rcu_dereference(conf->disks[dd_idx].rdev); - if (rdev && - (test_bit(Faulty, &rdev->flags) || + if (!rdev) + goto out_rcu_unlock; + if (test_bit(Faulty, &rdev->flags) || !(test_bit(In_sync, &rdev->flags) || - rdev->recovery_offset >= end_sector))) - rdev = NULL; + rdev->recovery_offset >= end_sector)) + goto out_rcu_unlock; } - if (r5c_big_stripe_cached(conf, align_bi->bi_iter.bi_sector)) { - rcu_read_unlock(); - bio_put(align_bi); + atomic_inc(&rdev->nr_pending); + rcu_read_unlock(); + + align_bio = bio_clone_fast(raid_bio, GFP_NOIO, &mddev->bio_set); + bio_set_dev(align_bio, rdev->bdev); + align_bio->bi_end_io = raid5_align_endio; + align_bio->bi_private = raid_bio; + align_bio->bi_iter.bi_sector = sector; + + raid_bio->bi_next = (void *)rdev; + + if (is_badblock(rdev, sector, bio_sectors(align_bio), &first_bad, + &bad_sectors)) { + bio_put(align_bio); + rdev_dec_pending(rdev, mddev); return 0; } - if (rdev) { - sector_t first_bad; - int bad_sectors; - - atomic_inc(&rdev->nr_pending); - rcu_read_unlock(); - raid_bio->bi_next = (void*)rdev; - bio_set_dev(align_bi, rdev->bdev); - - if (is_badblock(rdev, align_bi->bi_iter.bi_sector, - bio_sectors(align_bi), - &first_bad, &bad_sectors)) { - bio_put(align_bi); - rdev_dec_pending(rdev, mddev); - return 0; - } + /* No reshape active, so we can trust rdev->data_offset */ + align_bio->bi_iter.bi_sector += rdev->data_offset; - /* No reshape active, so we can trust rdev->data_offset */ - align_bi->bi_iter.bi_sector += rdev->data_offset; + spin_lock_irq(&conf->device_lock); + wait_event_lock_irq(conf->wait_for_quiescent, conf->quiesce == 0, + conf->device_lock); + atomic_inc(&conf->active_aligned_reads); + spin_unlock_irq(&conf->device_lock); - spin_lock_irq(&conf->device_lock); - wait_event_lock_irq(conf->wait_for_quiescent, - conf->quiesce == 0, - conf->device_lock); - atomic_inc(&conf->active_aligned_reads); - spin_unlock_irq(&conf->device_lock); + if (mddev->gendisk) + trace_block_bio_remap(align_bio, disk_devt(mddev->gendisk), + raid_bio->bi_iter.bi_sector); + submit_bio_noacct(align_bio); + return 1; - if (mddev->gendisk) - trace_block_bio_remap(align_bi, disk_devt(mddev->gendisk), - raid_bio->bi_iter.bi_sector); - submit_bio_noacct(align_bi); - return 1; - } else { - rcu_read_unlock(); - bio_put(align_bi); - return 0; - } +out_rcu_unlock: + rcu_read_unlock(); + return 0; } static struct bio *chunk_aligned_read(struct mddev *mddev, struct bio *raid_bio)