From patchwork Fri Oct 11 01:16:27 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yu Kuai X-Patchwork-Id: 13831799 Received: from dggsgout12.his.huawei.com (dggsgout12.his.huawei.com [45.249.212.56]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 49DD8E56C; Fri, 11 Oct 2024 01:18:31 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=45.249.212.56 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728609513; cv=none; b=OGpLaWUKNwfu51VPrrqsFCGBX7OnmHt56QZVVjK29zUxr2CxfhAYwamGN8ZHaVkIYeWGO8JxEE9lxaz8RoXqAN8A1EVUE+2eRPQtePEKzHskLuciq9dzbh3wAUWORJbibBa6Esgr8i0MXbVobjGdMirpmWGsD1X/XslHBuJZnmk= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728609513; c=relaxed/simple; bh=KUKhgcTv7A3aElOPyznW5LnT4rxr+R01qImq44zTWLE=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=Thj5jwRJ1XUU8HNXIYPY6tLXk5QGULje1mtjXDIkQruQGEaWzbsq1S6ZoKMKsYPm2E2b8icMQHhqzfgurNfZujXzpYmM5PCBUC/zsZlzHidNSs345g4qSIL/v7CDKYEWe0wNLbEzsyYxj2lgdRBYh5OD1OVye1uIvFvXCxWbzXE= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=huaweicloud.com; spf=pass smtp.mailfrom=huaweicloud.com; arc=none smtp.client-ip=45.249.212.56 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=huaweicloud.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=huaweicloud.com Received: from mail.maildlp.com (unknown [172.19.163.235]) by dggsgout12.his.huawei.com (SkyGuard) with ESMTP id 4XPpfC1WF4z4f3jLy; Fri, 11 Oct 2024 09:18:11 +0800 (CST) Received: from mail02.huawei.com (unknown [10.116.40.128]) by mail.maildlp.com (Postfix) with ESMTP id 1FBA81A058E; Fri, 11 Oct 2024 09:18:28 +0800 (CST) Received: from huaweicloud.com (unknown [10.175.104.67]) by APP4 (Coremail) with SMTP id gCh0CgDH+sbefAhnm9MFDw--.55490S8; Fri, 11 Oct 2024 09:18:27 +0800 (CST) From: Yu Kuai To: song@kernel.org, mariusz.tkaczyk@intel.com Cc: linux-raid@vger.kernel.org, linux-kernel@vger.kernel.org, yukuai3@huawei.com, yukuai1@huaweicloud.com, yi.zhang@huawei.com, yangerkun@huawei.com Subject: [PATCH v2 4/7] md/raid1: factor out helper to handle blocked rdev from raid1_write_request() Date: Fri, 11 Oct 2024 09:16:27 +0800 Message-Id: <20241011011630.2002803-5-yukuai1@huaweicloud.com> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20241011011630.2002803-1-yukuai1@huaweicloud.com> References: <20241011011630.2002803-1-yukuai1@huaweicloud.com> Precedence: bulk X-Mailing-List: linux-raid@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-CM-TRANSID: gCh0CgDH+sbefAhnm9MFDw--.55490S8 X-Coremail-Antispam: 1UD129KBjvJXoWxGw18KF15WFyxJF1xXFWrZrb_yoWrtrW5pw sI9a1FqrW7Cr15XFn0yFWUG3WrKw48tFWIyrW7Jw1xXw47tr95K3W0qryrJr9YkFZxurs8 XF1DCrW7C3429FUanT9S1TB71UUUUU7qnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDU0xBIdaVrnRJUUUBE14x267AKxVWrJVCq3wAFc2x0x2IEx4CE42xK8VAvwI8IcIk0 rVWrJVCq3wAFIxvE14AKwVWUJVWUGwA2048vs2IY020E87I2jVAFwI0_JF0E3s1l82xGYI kIc2x26xkF7I0E14v26ryj6s0DM28lY4IEw2IIxxk0rwA2F7IY1VAKz4vEj48ve4kI8wA2 z4x0Y4vE2Ix0cI8IcVAFwI0_Ar0_tr1l84ACjcxK6xIIjxv20xvEc7CjxVAFwI0_Gr1j6F 4UJwA2z4x0Y4vEx4A2jsIE14v26rxl6s0DM28EF7xvwVC2z280aVCY1x0267AKxVW0oVCq 3wAS0I0E0xvYzxvE52x082IY62kv0487Mc02F40EFcxC0VAKzVAqx4xG6I80ewAv7VC0I7 IYx2IY67AKxVWUJVWUGwAv7VC2z280aVAFwI0_Jr0_Gr1lOx8S6xCaFVCjc4AY6r1j6r4U M4x0Y48IcxkI7VAKI48JM4x0x7Aq67IIx4CEVc8vx2IErcIFxwCY1x0262kKe7AKxVWUAV WUtwCF04k20xvY0x0EwIxGrwCFx2IqxVCFs4IE7xkEbVWUJVW8JwC20s026c02F40E14v2 6r1j6r18MI8I3I0E7480Y4vE14v26r106r1rMI8E67AF67kF1VAFwI0_Jw0_GFylIxkGc2 Ij64vIr41lIxAIcVC0I7IYx2IY67AKxVWUJVWUCwCI42IY6xIIjxv20xvEc7CjxVAFwI0_ Gr0_Cr1lIxAIcVCF04k26cxKx2IYs7xG6r1j6r1xMIIF0xvEx4A2jsIE14v26r1j6r4UMI IF0xvEx4A2jsIEc7CjxVAFwI0_Gr0_Gr1UYxBIdaVFxhVjvjDU0xZFpf9x0JUvYLPUUUUU = X-CM-SenderInfo: 51xn3trlr6x35dzhxuhorxvhhfrp/ From: Yu Kuai Currently raid1 is preparing IO for underlying disks while checking if any disk is blocked, if so allocated resources must be released, then waiting for rdev to be unblocked and try to prepare IO again. Make code cleaner by checking blocked rdev first, it doesn't matter if rdev is blocked while issuing IO, the IO will wait for rdev to be unblocked or not. Signed-off-by: Yu Kuai --- drivers/md/raid1.c | 84 ++++++++++++++++++++++++++-------------------- 1 file changed, 48 insertions(+), 36 deletions(-) diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c index 6c9d24203f39..1679c1e9b3d5 100644 --- a/drivers/md/raid1.c +++ b/drivers/md/raid1.c @@ -1412,6 +1412,49 @@ static void raid1_read_request(struct mddev *mddev, struct bio *bio, submit_bio_noacct(read_bio); } +static bool wait_blocked_rdev(struct mddev *mddev, struct bio *bio) +{ + struct r1conf *conf = mddev->private; + int disks = conf->raid_disks * 2; + int i; + +retry: + for (i = 0; i < disks; i++) { + struct md_rdev *rdev = conf->mirrors[i].rdev; + + if (!rdev) + continue; + + if (test_bit(Blocked, &rdev->flags)) { + if (bio->bi_opf & REQ_NOWAIT) + return false; + + mddev_add_trace_msg(rdev->mddev, "raid1 wait rdev %d blocked", + rdev->raid_disk); + atomic_inc(&rdev->nr_pending); + md_wait_for_blocked_rdev(rdev, rdev->mddev); + goto retry; + } + + /* don't write here until the bad block is acknowledged */ + if (test_bit(WriteErrorSeen, &rdev->flags) && + rdev_has_badblock(rdev, bio->bi_iter.bi_sector, + bio_sectors(bio)) < 0) { + if (bio->bi_opf & REQ_NOWAIT) + return false; + + set_bit(BlockedBadBlocks, &rdev->flags); + mddev_add_trace_msg(rdev->mddev, "raid1 wait rdev %d blocked", + rdev->raid_disk); + atomic_inc(&rdev->nr_pending); + md_wait_for_blocked_rdev(rdev, rdev->mddev); + goto retry; + } + } + + return true; +} + static void raid1_write_request(struct mddev *mddev, struct bio *bio, int max_write_sectors) { @@ -1419,7 +1462,6 @@ static void raid1_write_request(struct mddev *mddev, struct bio *bio, struct r1bio *r1_bio; int i, disks; unsigned long flags; - struct md_rdev *blocked_rdev; int first_clone; int max_sectors; bool write_behind = false; @@ -1457,7 +1499,11 @@ static void raid1_write_request(struct mddev *mddev, struct bio *bio, return; } - retry_write: + if (!wait_blocked_rdev(mddev, bio)) { + bio_wouldblock_error(bio); + return; + } + r1_bio = alloc_r1bio(mddev, bio); r1_bio->sectors = max_write_sectors; @@ -1473,7 +1519,6 @@ static void raid1_write_request(struct mddev *mddev, struct bio *bio, */ disks = conf->raid_disks * 2; - blocked_rdev = NULL; max_sectors = r1_bio->sectors; for (i = 0; i < disks; i++) { struct md_rdev *rdev = conf->mirrors[i].rdev; @@ -1486,11 +1531,6 @@ static void raid1_write_request(struct mddev *mddev, struct bio *bio, if (!is_discard && rdev && test_bit(WriteMostly, &rdev->flags)) write_behind = true; - if (rdev && unlikely(test_bit(Blocked, &rdev->flags))) { - atomic_inc(&rdev->nr_pending); - blocked_rdev = rdev; - break; - } r1_bio->bios[i] = NULL; if (!rdev || test_bit(Faulty, &rdev->flags)) { if (i < conf->raid_disks) @@ -1506,13 +1546,6 @@ static void raid1_write_request(struct mddev *mddev, struct bio *bio, is_bad = is_badblock(rdev, r1_bio->sector, max_sectors, &first_bad, &bad_sectors); - if (is_bad < 0) { - /* mustn't write here until the bad block is - * acknowledged*/ - set_bit(BlockedBadBlocks, &rdev->flags); - blocked_rdev = rdev; - break; - } if (is_bad && first_bad <= r1_bio->sector) { /* Cannot write here at all */ bad_sectors -= (r1_bio->sector - first_bad); @@ -1543,27 +1576,6 @@ static void raid1_write_request(struct mddev *mddev, struct bio *bio, r1_bio->bios[i] = bio; } - if (unlikely(blocked_rdev)) { - /* Wait for this device to become unblocked */ - int j; - - for (j = 0; j < i; j++) - if (r1_bio->bios[j]) - rdev_dec_pending(conf->mirrors[j].rdev, mddev); - mempool_free(r1_bio, &conf->r1bio_pool); - allow_barrier(conf, bio->bi_iter.bi_sector); - - if (bio->bi_opf & REQ_NOWAIT) { - bio_wouldblock_error(bio); - return; - } - mddev_add_trace_msg(mddev, "raid1 wait rdev %d blocked", - blocked_rdev->raid_disk); - md_wait_for_blocked_rdev(blocked_rdev, mddev); - wait_barrier(conf, bio->bi_iter.bi_sector, false); - goto retry_write; - } - /* * When using a bitmap, we may call alloc_behind_master_bio below. * alloc_behind_master_bio allocates a copy of the data payload a page