From patchwork Tue Jan 5 12:27:16 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Minwoo Im X-Patchwork-Id: 11998745 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=-10.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,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 A89B3C433DB for ; Tue, 5 Jan 2021 12:29:39 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 81E8222AB9 for ; Tue, 5 Jan 2021 12:29:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730306AbhAEM3F (ORCPT ); Tue, 5 Jan 2021 07:29:05 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37926 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730300AbhAEM3C (ORCPT ); Tue, 5 Jan 2021 07:29:02 -0500 Received: from mail-pg1-x533.google.com (mail-pg1-x533.google.com [IPv6:2607:f8b0:4864:20::533]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 91014C061382; Tue, 5 Jan 2021 04:27:34 -0800 (PST) Received: by mail-pg1-x533.google.com with SMTP id 15so21181610pgx.7; Tue, 05 Jan 2021 04:27:34 -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; bh=XqETI2dj6LLMBcSn8TTOy0ZVVdhDfBt9SMpfQ1dkImQ=; b=WQsow3O8vXyWtIbJBHbR3W4gOlVwK8Qd/A5nbSTl85GhpmUx4R2I2WPb91OFzDusKE i9ktAcKupz8zPLeLVmyNz5//2HjmCTqFfJF2fXJG3Fgxcs2halLHhw11qJ1gasv635qX mX3/v0Q/4fhISLcYCclxQLkA7BJNwSYjJ3lzxbiXcuHQZqbjN3pJc/SQTpahgW9FyCrD YWwf1zAKqFLucH+DeaV//cym6fMcZrihcxKVSwVQBNWswgn9/ZDJ2GI0eACemKu6usj2 A+sx9UlNmn7BnkfrcKNfmBUB9+v8iDQKq19XGgQCPJR/H10bvARdcgJB/8924zxCY59I 28LA== 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; bh=XqETI2dj6LLMBcSn8TTOy0ZVVdhDfBt9SMpfQ1dkImQ=; b=LKH/61MBScCqNThhyieKoEqilLLWx7nbh9HRbO/9Bft1NQd6f8R3VL2teyobZVhkEq YEshie04dpL3SwcgKlavBhbUHOqrNeGlPXU47+rR/lPdwdQL1ymh+TIhXMSnQdYYdr4+ e9K8UZB6lcBsM0Cbl7S7+LvzHufHENol5RPuvmuKkF0lGU/iq3TmYNRsN1awdr8hxwbA cvIVrfgHlsZJtkWmURX2xszbga9X1XwLBJTl6az4UE1QLBE5sLY77tqMZ+87ER/R+EAl +ce1pYdkuNyAvIRJZNbYujhXZ4tr4iT29tF6+/UNHUPxM9W8dK5kyplTJZoLTsF7Fy8x arGg== X-Gm-Message-State: AOAM530WrK7AHTnP0U0A4H8znSKnDZ65wEIH3LnUARWx609uB+e3xCO0 jCESWmrqpqvGm9R95Luif8MPPBDWD2calA== X-Google-Smtp-Source: ABdhPJyQy0Jl0taKm2oXKaclq9kNLyhy6PSoq+ZrxVqR0efdgYnsNiNwszpgiWCRPsmgqf3hr6zucg== X-Received: by 2002:aa7:9f97:0:b029:1a5:94d8:9cbf with SMTP id z23-20020aa79f970000b02901a594d89cbfmr68773148pfr.79.1609849653923; Tue, 05 Jan 2021 04:27:33 -0800 (PST) Received: from localhost.localdomain ([211.108.35.36]) by smtp.gmail.com with ESMTPSA id gw7sm2599647pjb.36.2021.01.05.04.27.31 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 05 Jan 2021 04:27:33 -0800 (PST) From: Minwoo Im To: linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-nvme@lists.infradead.org Cc: Jens Axboe , Alexander Viro , Christoph Hellwig , Chaitanya Kulkarni , Minwoo Im Subject: [PATCH V4 0/1] block: fix I/O errors in BLKRRPART Date: Tue, 5 Jan 2021 21:27:16 +0900 Message-Id: <20210105122717.2568-1-minwoo.im.dev@gmail.com> X-Mailer: git-send-email 2.17.1 Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org Hello, 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. Testcase: The following testcase is a case of NVMe namespace with the following conditions: - Current LBA format is lbaf=0 (512 bytes logical block size) - LBA Format(lbaf=1) has 4096 bytes logical block size # Format block device logical block size 512B to 4096B nvme format /dev/nvme0n1 --lbaf=1 --force This will cause I/O errors because BLKRRPART ioctl() happened right after the format command with same file descriptor opened in application (e.g., nvme-cli) like: fd = open("/dev/nvme0n1", O_RDONLY); nvme_format(fd, ...); if (ioctl(fd, BLKRRPART) < 0) ... Errors: We can see the Read command with Number of LBA(NLB) 0xffff(65535) which was under-flowed because BLKRRPART operation requested request size based on i_blkbits of the block device which is 9 via buffer_head. [dmesg-snip] [ 10.771740] blk_update_request: operation not supported error, dev nvme0n1, sector 0 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0 [ 10.780262] Buffer I/O error on dev nvme0n1, logical block 0, async page read [event-snip] kworker/0:1H-56 [000] .... 913.456922: nvme_setup_cmd: nvme0: disk=nvme0n1, qid=1, cmdid=216, nsid=1, flags=0x0, meta=0x0, cmd=(nvme_cmd_read slba=0, len=65535, ctrl=0x0, dsmgmt=0, reftag=0) ksoftirqd/0-9 [000] .Ns. 916.566351: nvme_complete_rq: nvme0: disk=nvme0n1, qid=1, cmdid=216, res=0x0, retries=0, flags=0x0, status=0x4002 The patch below fixes the I/O errors by rejecting I/O requests from the block layer with setting a flag to request_queue until the file descriptor re-opened to be updated by __blkdev_get(). This is based on the previous discussion [1]. Since V3(RFC): - Move flag from gendisk to request_queue for future clean-ups. (Christoph, [3]) Since V2(RFC): - Cover letter with testcase and error logs attached. Removed un-related changes: empty line. (Chaitanya, [2]) - Put blkdev with blkdev_put_no_open(). Since V1(RFC): - Updated patch to reject I/O rather than updating i_blkbits of the block device's inode directly from driver. (Christoph, [1]) [1] https://lore.kernel.org/linux-nvme/20201223183143.GB13354@localhost.localdomain/T/#t [2] https://lore.kernel.org/linux-nvme/20201230140504.GB7917@localhost.localdomain/T/#t [3] https://lore.kernel.org/linux-block/20210105101202.GA9970@localhost.localdomain/T/#u Thanks, Minwoo Im (1): block: reject I/O for same fd if block size changed 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(+)