From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 7456723D7E8; Tue, 21 Oct 2025 20:03:51 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1761077032; cv=none; b=MhNkp3VFrx2InPHE/ti3JntFJjZuKSZr1ddU1KG0jW/V1wL+u63NbmCEriaJRn6B5FIffMuY5GKXLKl/MNsYFEMpPP8MFI/WdcyTJnADdkqH+aWm3hZ0LesbVnLP4XBdMwPMcCVgBAWd00vNDsYAyhc/H7VeMQF5Erly0CIxjNc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1761077032; c=relaxed/simple; bh=YS8NlBT3aU0zi4H8ycTjqtWWawmOnw/GbEqlHYO9PJc=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=YC9w2CftihZM4lwsi3hRRUrsEIB9KrpabVu2tfwZZi1edK/284pVZubsgOXU6dwr7g+ZXwGKhOlEggxSu8RRnhS0Qr/K0TOBo+N41LEWi670voSsT1L78ejjKQ0Y/PpEjL+dBqNYTB7pgyn80axcCwaVX5PzvDUbrfpW1oVS6lQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=wzrmSj9O; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="wzrmSj9O" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 88FA7C4CEF5; Tue, 21 Oct 2025 20:03:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1761077030; bh=YS8NlBT3aU0zi4H8ycTjqtWWawmOnw/GbEqlHYO9PJc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=wzrmSj9OasZrxnNj1BVulxg+UFg2sliYEUIO1MucPjPsoYWcqPHbj+eNBUF77EbmH xu9cLkVKuS68Ajq3l2ZuOWBgskrlUtwBCg8NTm2EbfMiI4q4Hbto0UmHAO6DlBAUr0 oPuXJnLWomt8I1L9cuyh4Yzq/NSGVHrredt3uehk= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Yu Kuai , Damien Le Moal , Christoph Hellwig , Jens Axboe , Sasha Levin Subject: [PATCH 6.12 114/136] md: fix mssing blktrace bio split events Date: Tue, 21 Oct 2025 21:51:42 +0200 Message-ID: <20251021195038.709345986@linuxfoundation.org> X-Mailer: git-send-email 2.51.1 In-Reply-To: <20251021195035.953989698@linuxfoundation.org> References: <20251021195035.953989698@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.12-stable review patch. If anyone has any objections, please let me know. ------------------ From: Yu Kuai [ Upstream commit 22f166218f7313e8fe2d19213b5f4b3265f8c39e ] If bio is split by internal handling like chunksize or badblocks, the corresponding trace_block_split() is missing, resulting in blktrace inability to catch BIO split events and making it harder to analyze the BIO sequence. Cc: stable@vger.kernel.org Fixes: 4b1faf931650 ("block: Kill bio_pair_split()") Signed-off-by: Yu Kuai Reviewed-by: Damien Le Moal Reviewed-by: Christoph Hellwig Signed-off-by: Jens Axboe Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman --- drivers/md/md-linear.c | 1 + drivers/md/raid0.c | 4 ++++ drivers/md/raid1.c | 4 ++++ drivers/md/raid10.c | 8 ++++++++ drivers/md/raid5.c | 2 ++ 5 files changed, 19 insertions(+) --- a/drivers/md/md-linear.c +++ b/drivers/md/md-linear.c @@ -267,6 +267,7 @@ static bool linear_make_request(struct m } bio_chain(split, bio); + trace_block_split(split, bio->bi_iter.bi_sector); submit_bio_noacct(bio); bio = split; } --- a/drivers/md/raid0.c +++ b/drivers/md/raid0.c @@ -470,7 +470,9 @@ static void raid0_handle_discard(struct bio_endio(bio); return; } + bio_chain(split, bio); + trace_block_split(split, bio->bi_iter.bi_sector); submit_bio_noacct(bio); bio = split; end = zone->zone_end; @@ -618,7 +620,9 @@ static bool raid0_make_request(struct md bio_endio(bio); return true; } + bio_chain(split, bio); + trace_block_split(split, bio->bi_iter.bi_sector); raid0_map_submit_bio(mddev, bio); bio = split; } --- a/drivers/md/raid1.c +++ b/drivers/md/raid1.c @@ -1383,7 +1383,9 @@ static void raid1_read_request(struct md error = PTR_ERR(split); goto err_handle; } + bio_chain(split, bio); + trace_block_split(split, bio->bi_iter.bi_sector); submit_bio_noacct(bio); bio = split; r1_bio->master_bio = bio; @@ -1574,7 +1576,9 @@ static void raid1_write_request(struct m error = PTR_ERR(split); goto err_handle; } + bio_chain(split, bio); + trace_block_split(split, bio->bi_iter.bi_sector); submit_bio_noacct(bio); bio = split; r1_bio->master_bio = bio; --- a/drivers/md/raid10.c +++ b/drivers/md/raid10.c @@ -1208,7 +1208,9 @@ static void raid10_read_request(struct m error = PTR_ERR(split); goto err_handle; } + bio_chain(split, bio); + trace_block_split(split, bio->bi_iter.bi_sector); allow_barrier(conf); submit_bio_noacct(bio); wait_barrier(conf, false); @@ -1484,7 +1486,9 @@ static void raid10_write_request(struct error = PTR_ERR(split); goto err_handle; } + bio_chain(split, bio); + trace_block_split(split, bio->bi_iter.bi_sector); allow_barrier(conf); submit_bio_noacct(bio); wait_barrier(conf, false); @@ -1669,7 +1673,9 @@ static int raid10_handle_discard(struct bio_endio(bio); return 0; } + bio_chain(split, bio); + trace_block_split(split, bio->bi_iter.bi_sector); allow_barrier(conf); /* Resend the fist split part */ submit_bio_noacct(split); @@ -1684,7 +1690,9 @@ static int raid10_handle_discard(struct bio_endio(bio); return 0; } + bio_chain(split, bio); + trace_block_split(split, bio->bi_iter.bi_sector); allow_barrier(conf); /* Resend the second split part */ submit_bio_noacct(bio); --- a/drivers/md/raid5.c +++ b/drivers/md/raid5.c @@ -5484,8 +5484,10 @@ static struct bio *chunk_aligned_read(st if (sectors < bio_sectors(raid_bio)) { struct r5conf *conf = mddev->private; + split = bio_split(raid_bio, sectors, GFP_NOIO, &conf->bio_split); bio_chain(split, raid_bio); + trace_block_split(split, raid_bio->bi_iter.bi_sector); submit_bio_noacct(raid_bio); raid_bio = split; }