From nobody Sun Feb 8 20:29:13 2026 Received: from mail-yb1-f202.google.com (mail-yb1-f202.google.com [209.85.219.202]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 32D086FDC for ; Fri, 5 Apr 2024 01:43:23 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.219.202 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1712281404; cv=none; b=TQBerRSEF4qfvZ9a44qaAf+aiNWAxHtNem2aCvaEKqHyHPWPIUw3QX1Dd9hHtScJB3hzi6QSlviN8MC5RiAu/j60U7KxGU7jndSgt4ltGwyRDnJ8MHGVnYJIF4LgJ1pRwRWdF199HTBznoPton3COa/EwiuvIm/szD6eS3kuNxA= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1712281404; c=relaxed/simple; bh=URaZQzuDjC1y+JWc4rSLFFtEsZXFxrIaWQtmHQtpG64=; h=Date:Mime-Version:Message-ID:Subject:From:To:Cc:Content-Type; b=dGmdsPadYGTaEK3T3cxYapy5eAs81jNBAjn8j9Bf/7xlvkLnTFjjkRltz9wcZejjnaWmuA+bvmUNdGFjDQWObLCCQ2WNGmHGRR8N2fI2wpi1TMYG74naWbHsFBzgst0PS2HXnyPIGSRqhx9E/+WkaLZzVyaRfOEQzwANk5u+8t4= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--saranyamohan.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=CXxi5cPS; arc=none smtp.client-ip=209.85.219.202 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--saranyamohan.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="CXxi5cPS" Received: by mail-yb1-f202.google.com with SMTP id 3f1490d57ef6-dbf216080f5so2747111276.1 for ; Thu, 04 Apr 2024 18:43:23 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1712281402; x=1712886202; darn=vger.kernel.org; h=cc:to:from:subject:message-id:mime-version:date:from:to:cc:subject :date:message-id:reply-to; bh=3yhnAORJgGG1KHraVLDZCGL3HZq2R87i+RUHP6rWUSg=; b=CXxi5cPS8ba34z1a5yDAQ9tPNaoj4imfe+/kMhEUraNVjGrGp2C4Gf0GEW3qGCPNih UhWLCWubya1a9UmRS+ry0nv1EG2mQbRQfCLWpJ7mGJ2BeJW9mrMhcGh78lwWuNEn03rV JTvEJ7D9iOvhEnPRFQAybSd9W/t4LrToV+IBlF2DkQ93YB+r1Guogbg+4HHQs/ax1viV 2E/J9ywURbrYXkkHw00Q6/FGXmETxABDwHwW/dZcO/qS3ZPrwoe2ZfLlycnkF+ctRPrj 12cgs1bBqQPGaWNWIpsV04RdjszQWYkNXbAhiKJr/OtdyRhLdaHjbYkrZOmmdVSfjsGw E6lA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1712281402; x=1712886202; h=cc:to:from:subject:message-id:mime-version:date:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=3yhnAORJgGG1KHraVLDZCGL3HZq2R87i+RUHP6rWUSg=; b=AWWI70yzixYtwGhVUxEamY8tX+y+aaOSIXrHEgaCdMIcnnwP8kpOwd/lBhlhpGU/lZ Lufv+t3LhLjGlm97pJVFJeu88NreOgxDJHh2JNsVQHs/odyx0jqeht7Sq1sK+Jhoukzy cv1rQ+GiPmTWF+mIeOTFzzOJeZFFJP0XlMOWJAJcPfOfwz5dFpzftx+IJdzK7Gpymz5Z gG1IFZnXyqUmC+NcD5QHUghnEnDUvwKGPOOKl1dbSLEOezX4FnEOloJmCppHmr80B5fN JRP+rHypxWnEmziJmJ6IUyG6nPB/dNPHZruaqv8tS6n0Z1oKVKiV6Kpua+YtmlIF5qi6 rwMw== X-Forwarded-Encrypted: i=1; AJvYcCULG2q+yZBYmeFKyuWITfCNifOFCg2pXYJH9IImNgLkLdR0B0jqOB8vGbEsJWFm8/GWkfly1HYBuWMRBNtyt5UYW2Tm1jZihSNQEmPK X-Gm-Message-State: AOJu0YxU+EYvVPcNWfxvvYgkkeadrpQH+li4YgjFtgcmm0kSbbtdp52t UXOFRDg0ic3DXI0ABCN+GUFmzW2F+PynYPJas0UwdBhdgSxqXgfqYFKORD7HmJYxWiXeZl3xRDW Chd7rCO4yXqdcZ52X9G97xtgEQg== X-Google-Smtp-Source: AGHT+IGuSeucnURFqdpRNkhu5A9mlb9yFfsSaydOKK0WTKBYMa+IRt1tjptLuEyfYnMvrp0t3LRZ5aWiDWX8iAqK5/Q= X-Received: from saranyamohan.svl.corp.google.com ([2620:15c:2a3:200:b12b:59df:64f6:cb16]) (user=saranyamohan job=sendgmr) by 2002:a05:6902:154d:b0:dda:eee6:8e52 with SMTP id r13-20020a056902154d00b00ddaeee68e52mr352605ybu.7.1712281402308; Thu, 04 Apr 2024 18:43:22 -0700 (PDT) Date: Thu, 4 Apr 2024 18:42:53 -0700 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 X-Mailer: git-send-email 2.44.0.478.gd926399ef9-goog Message-ID: <20240405014253.748627-1-saranyamohan@google.com> Subject: [PATCH] block: Fix BLKRRPART regression From: Saranya Muruganandam To: Jens Axboe , Tejun Heo , Yu Kuai , Christoph Hellwig , stable@vger.kernel.org Cc: linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, Saranya Muruganandam Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" The BLKRRPART ioctl used to report errors such as EIO before we changed the blkdev_reread_part() logic. Lets add a flag and capture the errors returned by bdev_disk_changed() when the flag is set. Setting this flag for the BLKRRPART path when we want the errors to be reported when rereading partitions on the disk. Link: https://lore.kernel.org/all/20240320015134.GA14267@lst.de/ Suggested-by: Christoph Hellwig Tested: Tested by simulating failure to the block device and will propose a new test to blktests. Fixes: 4601b4b130de ("block: reopen the device in blkdev_reread_part") Reported-by: Saranya Muruganandam Signed-off-by: Saranya Muruganandam Change-Id: Idf3d97390ed78061556f8468d10d6cab24ae20b1 --- block/bdev.c | 31 +++++++++++++++++++++---------- block/ioctl.c | 3 ++- include/linux/blkdev.h | 3 +++ 3 files changed, 26 insertions(+), 11 deletions(-) diff --git a/block/bdev.c b/block/bdev.c index 77fa77cd29bee..71478f8865546 100644 --- a/block/bdev.c +++ b/block/bdev.c @@ -632,6 +632,14 @@ static void blkdev_flush_mapping(struct block_device *= bdev) bdev_write_inode(bdev); } =20 +static void blkdev_put_whole(struct block_device *bdev) +{ + if (atomic_dec_and_test(&bdev->bd_openers)) + blkdev_flush_mapping(bdev); + if (bdev->bd_disk->fops->release) + bdev->bd_disk->fops->release(bdev->bd_disk); +} + static int blkdev_get_whole(struct block_device *bdev, blk_mode_t mode) { struct gendisk *disk =3D bdev->bd_disk; @@ -650,18 +658,21 @@ static int blkdev_get_whole(struct block_device *bdev= , blk_mode_t mode) =20 if (!atomic_read(&bdev->bd_openers)) set_init_blocksize(bdev); - if (test_bit(GD_NEED_PART_SCAN, &disk->state)) - bdev_disk_changed(disk, false); atomic_inc(&bdev->bd_openers); - return 0; -} =20 -static void blkdev_put_whole(struct block_device *bdev) -{ - if (atomic_dec_and_test(&bdev->bd_openers)) - blkdev_flush_mapping(bdev); - if (bdev->bd_disk->fops->release) - bdev->bd_disk->fops->release(bdev->bd_disk); + if (test_bit(GD_NEED_PART_SCAN, &disk->state)) { + /* + * Only return scanning errors if we are called from contexts + * that explicitly want them, e.g. the BLKRRPART ioctl. + */ + ret =3D bdev_disk_changed(disk, false); + if (ret && (mode & BLK_OPEN_STRICT_SCAN)) { + blkdev_put_whole(bdev); + return ret; + } + } + + return 0; } =20 static int blkdev_get_part(struct block_device *part, blk_mode_t mode) diff --git a/block/ioctl.c b/block/ioctl.c index aa46f3761c3ed..e8d72d9f327fd 100644 --- a/block/ioctl.c +++ b/block/ioctl.c @@ -557,7 +557,8 @@ static int blkdev_common_ioctl(struct block_device *bde= v, blk_mode_t mode, return -EACCES; if (bdev_is_partition(bdev)) return -EINVAL; - return disk_scan_partitions(bdev->bd_disk, mode); + return disk_scan_partitions(bdev->bd_disk, + mode | BLK_OPEN_STRICT_SCAN); case BLKTRACESTART: case BLKTRACESTOP: case BLKTRACETEARDOWN: diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index 01983eece8f2a..d0104dc839b0d 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -151,6 +151,9 @@ struct access_rules_head { int max_rules; }; =20 +/* return partition scanning errors */ +#define BLK_OPEN_STRICT_SCAN ((__force blk_mode_t)(1 << 5)) + struct gendisk { /* * major/first_minor/minors should not be set by any new driver, the --=20 2.44.0.478.gd926399ef9-goog