From patchwork Tue Jan 26 00:29:00 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Minwoo Im X-Patchwork-Id: 12048105 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 20025C433E0 for ; Tue, 26 Jan 2021 19:49:10 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D9B1C2220B for ; Tue, 26 Jan 2021 19:49:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731925AbhAZFdv (ORCPT ); Tue, 26 Jan 2021 00:33:51 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51110 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727690AbhAZBuH (ORCPT ); Mon, 25 Jan 2021 20:50:07 -0500 Received: from mail-pf1-x42d.google.com (mail-pf1-x42d.google.com [IPv6:2607:f8b0:4864:20::42d]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 16584C0617AA; Mon, 25 Jan 2021 16:29:08 -0800 (PST) Received: by mail-pf1-x42d.google.com with SMTP id o20so9409882pfu.0; Mon, 25 Jan 2021 16:29:08 -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=U5Xee1nWGWRf4U7sOGzZ/yhKEr2omkTib7NUJ1y8Lic=; b=N7hs8yqlQ0ARbi9YXeVbc50WURb9InsHCQryflEHIqFJrD0mWEzmbVhgFQFvI1w0mt JSFhWufzUTTxeOicc6wSnqTUHSh8k3Aj8L16YKiK0oyYnr5We/+7yhpwoHfcuiueKu+/ RnHqrKd9ZyAmV/zEq34pFPErmdJUNYH9pNMFAxeCPGpUd3RqVgeb+KU1wc88WaLD4/LD rrztNBLli66Wg9aEG+/0hyqhuauEOpV5zEj/vif8vjVQ+Yq17aG3mC1txiVWxdO7dMNz DADDErrVqs/3fIuCFP0n4PPRb7FasjDInEkNkno/rCYaYbCfYKyyVj32az3tGunIxLYL w/JQ== 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=U5Xee1nWGWRf4U7sOGzZ/yhKEr2omkTib7NUJ1y8Lic=; b=P+yFq8A/vOEbS9BZOFfzuJh0869cZ6yRr51/7om5tGjU+S3YeSMjphYZytzs6goSbK Vms305s2PpK0VU1+tFGNKqWwC1nWnH42UDjTwFNjJOl3KpAtDDA3bMeowIzKuAg4jA9A POGs7H4tRhxHB1CNuI4xURSslGMOBB8ylrjodhGiJGHU3VyhoDaoGHxBvIiXPodgvANE YXw7YlVZ+OCiwNDtzWOwqrBRje0wXsMM1AkV599XOy8pitRAidezdFxP018z+XZaWFza TZB7dYtLquhckPKo3oNpmgjll8783WwkXS/2H8aDiotvnv3ZUdArgL08Z8TGih6DKjXk UIrQ== X-Gm-Message-State: AOAM532AurApBz4qRr86jxVyESkLCiqadwrrQubq8O33haaI1xShJjqW 0KtBw/Rf3kavPKhaD5OLki1GBmmnytCLvA== X-Google-Smtp-Source: ABdhPJw7dW5USNY2wqoFH1aplTri/zdWl8Na9Oi6AskJQD3ROtTCwM7xIvKSK6ZDVCtMh8R1IrGuOg== X-Received: by 2002:a63:305:: with SMTP id 5mr3077239pgd.234.1611620947344; Mon, 25 Jan 2021 16:29:07 -0800 (PST) Received: from localhost.localdomain ([211.108.35.36]) by smtp.gmail.com with ESMTPSA id 14sm16999418pfi.131.2021.01.25.16.29.04 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 25 Jan 2021 16:29:06 -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 0/1] block: fix I/O errors in BLKRRPART Date: Tue, 26 Jan 2021 09:29:00 +0900 Message-Id: <20210126002901.5533-1-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 series is just RESEND with rebasing it on for-next) 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 V5: - Rebased on for-next Since V4: - Rebased on block-5.11. - Added Reviewed-by Tag from Christoph. 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]) 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(+)