From patchwork Tue Jan 26 00:29:01 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Minwoo Im X-Patchwork-Id: 12045393 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=-15.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, 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 06B2CC433DB for ; Tue, 26 Jan 2021 05:27:09 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id CFAC222795 for ; Tue, 26 Jan 2021 05:27:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727304AbhAZF1A (ORCPT ); Tue, 26 Jan 2021 00:27:00 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51108 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730732AbhAZBuH (ORCPT ); Mon, 25 Jan 2021 20:50:07 -0500 Received: from mail-pl1-x633.google.com (mail-pl1-x633.google.com [IPv6:2607:f8b0:4864:20::633]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id BA260C0617AB; Mon, 25 Jan 2021 16:29:10 -0800 (PST) Received: by mail-pl1-x633.google.com with SMTP id 31so8684371plb.10; Mon, 25 Jan 2021 16:29:10 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=1AHl1Jx34jtswhTgBtYxAYHOD6t8RmqegigD5lUsac8=; b=gA4LrW6ezNXmg9lXnOFBzmx/WQMapGLtPz5AUxxxYPROCquUMiYgpVgeuoDZfQwacZ 4dwqRAO46GYB0vGxgzBJMA8HtmO7z8E2myH0rDY7GGbj75orW39T2cCO7wJlVrrCHZs4 T542gosGDAcQv4rrktCCBwIxVTnEoNVBt4IFMKEz3q4DGsy2H5H0cQAngiUZo9W5c0XD oIjhCm5Pte2gNHuMjGQAOjE6RD3RKzvryxAdnLW5Z8vzBJsmAnJ/VXpCoXoPEafELaqj kKUiE6NfY5mXfU7bPtet06Qrjx9hlY/AiYeufbcwvfF85q/JbGN6IHuPHlbpVYvZc2RO lnCQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=1AHl1Jx34jtswhTgBtYxAYHOD6t8RmqegigD5lUsac8=; b=sqkxBdMz3C/9MnBtGa+waful/ugk6VE6La3cn2tcyGolty1rirkmWxkVufTYzKk27G ACGX2crGItmOxG+6cMkn6yFVeVovnUnuc5ngvq+CNLv6jXSmaFnESQkq7ZBySl2Zs+ru mhmTN4qPWGNWa1rVcboS0uafRCawkHcgTUB/lRvP4pbTkDLY1iuLku29eIHn2mNuF/nE C2yHYX2KE3vhEHWjWkwRzenjJJUOMGcgVm+s2Ro0+J2kGeozBZGMadns+R7xNwCKJhAq JDYVbuhFg2rKFSDS7Q6p2ljJAwIxTegBH7QxFnlSrOvLFasvRVRBzXGBo7kxtAq2kmLS 19KA== X-Gm-Message-State: AOAM533ddv5zrNYfVvIlB2xoHOScUuIOCGW2S68CLE9S5ifqpxCLkQ1Q 1RyeqGptc+9wUxv/tTRBoEejpTcYuh748w== X-Google-Smtp-Source: ABdhPJyE9yobq1Vsf/eirkfosewjx3+aPxw3rFxwL5/dV9oYN0s9MY6mWyTofZqBXmFwH8TqPbigWA== X-Received: by 2002:a17:90b:350:: with SMTP id fh16mr3029352pjb.232.1611620950036; Mon, 25 Jan 2021 16:29:10 -0800 (PST) Received: from localhost.localdomain ([211.108.35.36]) by smtp.gmail.com with ESMTPSA id 14sm16999418pfi.131.2021.01.25.16.29.07 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 25 Jan 2021 16:29:09 -0800 (PST) From: Minwoo Im To: linux-block@vger.kernel.org, linux-nvme@lists.infradead.org, linux-fsdevel@vger.kernel.org Cc: Jens Axboe , Alexander Viro , Christoph Hellwig , Minwoo Im Subject: [PATCH V6 1/1] block: reject I/O for same fd if block size changed Date: Tue, 26 Jan 2021 09:29:01 +0900 Message-Id: <20210126002901.5533-2-minwoo.im.dev@gmail.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20210126002901.5533-1-minwoo.im.dev@gmail.com> References: <20210126002901.5533-1-minwoo.im.dev@gmail.com> Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org This patch fixes I/O errors during BLKRRPART ioctl() behavior right after format operation that changed logical block size of the block device with a same file descriptor opened. This issue can be easily reproduced with a single format command in case of NVMe (logical block size 512B to 4096B). nvme format /dev/nvme0n1 --lbaf=1 --force This is because the application, nvme-cli format subcommand issues an admin command followed by BLKRRPART ioctl to re-read partition information without closing the file descriptor. If file descriptor stays opened, __blkdev_get() will not be invoked at all even logical block size has been changed. It will cause I/O errors with invalid Read operations during the BLKRRPART ioctl due to i_blkbits mismatch. The invalid operations in BLKRRPART happens with under-flowed Number of LBA(NLB) values 0xffff(65535) because i_blkbits is still set to 9 even the logical block size has been updated to 4096. The BLKRRPART will lead buffer_head to hold 512B data which is less than the logical lock size of the block device. The root cause, which is because i_blkbits of inode of the block device is not updated, can be solved easily by re-opening file descriptor again from application. But, that's just for application's business and kernel should reject invalid Read operations during the BLKRRPART ioctl. This patch rejects I/O from the path of add_partitions() to avoid issuing invalid Read operations to device. It sets a flag to request_queue in blk_queue_logical_block_size to minimize caller-side updates. Signed-off-by: Minwoo Im Reviewed-by: Christoph Hellwig --- block/blk-settings.c | 3 +++ block/partitions/core.c | 12 ++++++++++++ fs/block_dev.c | 8 ++++++++ include/linux/blkdev.h | 1 + 4 files changed, 24 insertions(+) diff --git a/block/blk-settings.c b/block/blk-settings.c index 4c974340f1a9..5b1e0bf54d7e 100644 --- a/block/blk-settings.c +++ b/block/blk-settings.c @@ -329,6 +329,9 @@ void blk_queue_logical_block_size(struct request_queue *q, unsigned int size) { struct queue_limits *limits = &q->limits; + if (limits->logical_block_size != size) + blk_queue_flag_set(QUEUE_FLAG_LBSZ_CHANGED, q); + limits->logical_block_size = size; if (limits->physical_block_size < size) diff --git a/block/partitions/core.c b/block/partitions/core.c index b1cdf88f96e2..092d6712c7fc 100644 --- a/block/partitions/core.c +++ b/block/partitions/core.c @@ -601,12 +601,24 @@ static bool blk_add_partition(struct gendisk *disk, struct block_device *bdev, int blk_add_partitions(struct gendisk *disk, struct block_device *bdev) { + struct request_queue *q = bdev_get_queue(bdev); struct parsed_partitions *state; int ret = -EAGAIN, p; if (!disk_part_scan_enabled(disk)) return 0; + /* + * Reject to check partition information if block size has been changed + * in the runtime. If block size of a block device has been changed, + * the file descriptor should be opened agian to update the blkbits. + */ + if (test_bit(QUEUE_FLAG_LBSZ_CHANGED, &q->queue_flags)) { + pr_warn("%s: rejecting checking partition. fd should be opened again.\n", + disk->disk_name); + return -EBADFD; + } + state = check_partition(disk, bdev); if (!state) return 0; diff --git a/fs/block_dev.c b/fs/block_dev.c index 6f5bd9950baf..8555308c503d 100644 --- a/fs/block_dev.c +++ b/fs/block_dev.c @@ -130,7 +130,15 @@ EXPORT_SYMBOL(truncate_bdev_range); static void set_init_blocksize(struct block_device *bdev) { + struct request_queue *q = bdev_get_queue(bdev); + bdev->bd_inode->i_blkbits = blksize_bits(bdev_logical_block_size(bdev)); + + /* + * Allow I/O commands for this block device. We can say that this + * block device has proper blkbits updated. + */ + blk_queue_flag_clear(QUEUE_FLAG_LBSZ_CHANGED, q); } int set_blocksize(struct block_device *bdev, int size) diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index 20f3706b6b2e..f725e933db40 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -621,6 +621,7 @@ struct request_queue { #define QUEUE_FLAG_RQ_ALLOC_TIME 27 /* record rq->alloc_time_ns */ #define QUEUE_FLAG_HCTX_ACTIVE 28 /* at least one blk-mq hctx is active */ #define QUEUE_FLAG_NOWAIT 29 /* device supports NOWAIT */ +#define QUEUE_FLAG_LBSZ_CHANGED 30 /* logical block size changed */ #define QUEUE_FLAG_MQ_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \ (1 << QUEUE_FLAG_SAME_COMP) | \