From mboxrd@z Thu Jan 1 00:00:00 1970 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=-9.9 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham 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 C83C5C43331 for ; Mon, 11 Nov 2019 19:01:47 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id A099E222C1 for ; Mon, 11 Nov 2019 19:01:47 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=chromium.org header.i=@chromium.org header.b="NZTpU1UE" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730290AbfKKTBq (ORCPT ); Mon, 11 Nov 2019 14:01:46 -0500 Received: from mail-pl1-f195.google.com ([209.85.214.195]:35138 "EHLO mail-pl1-f195.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728969AbfKKSus (ORCPT ); Mon, 11 Nov 2019 13:50:48 -0500 Received: by mail-pl1-f195.google.com with SMTP id s10so8162179plp.2 for ; Mon, 11 Nov 2019 10:50:48 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=Cj9EDPrGBtXH1r7z1h31u4mvPDvEY9hEU3TV12jxQYU=; b=NZTpU1UE5cacrL70YHIATCygG5yvGdKJ2bJwCakmjoZk2TRDbTo1cq/30lw/WokZaQ /5OETKfVamEbRA9JDXpE+Mt13M+pILP/r8uGQ4G8HANMBgeuXIm6lN1tt1cpcnuYg/Mq o5LgGSPxa1SSQz2THqJPPxW+uZfkg13VKHhnA= 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:mime-version:content-transfer-encoding; bh=Cj9EDPrGBtXH1r7z1h31u4mvPDvEY9hEU3TV12jxQYU=; b=EbjgzU/Z+qWRiAtZhAt3LlvW3tmPL5Zu7kbmgSCCrYYzeNZbh4wMOcTR8BW7zdNSJQ Ti3UYslVrb4XZAIXvWF8qYzzjKRCWKTDtZW1lw+D8s24OCvP5nZlhdBL3PbQ48w/KfJO sra1DxDWGjzPoQPzAjXKi4y1qHToLXCxCZy+OdaJpylF1QpfvIClWQlHI2EoRSobSPMe 1AxynDE4E75+DY7XJ1mVV7KAb28N5FVDi6bEyeBvHP5sTtWhGQLDqbpaqd8AWH1iGHxl WTOT/iftMxdgu4/XKF1vRM38A/JkXopySSFQq0QZtxL6h/V4K0xxnpM1f8sK5de4t/ze wefw== X-Gm-Message-State: APjAAAUpyn5nDBCFb1JbwLbTxE50BCduWirm33rLvbfgUZQrauBmypQ9 hsiSkq7PMOAiBOxgKRzoyKeEmQ== X-Google-Smtp-Source: APXvYqwuzQklBI9f0cDuhvdBej8tfYIE5uw1h5GVurTSuwRhaOsanFgqLXSpzxDZLahjKU8GxzlXEw== X-Received: by 2002:a17:902:5acd:: with SMTP id g13mr27808948plm.242.1573498247918; Mon, 11 Nov 2019 10:50:47 -0800 (PST) Received: from evgreen2.mtv.corp.google.com ([2620:15c:202:201:ffda:7716:9afc:1301]) by smtp.gmail.com with ESMTPSA id v63sm15220971pfb.181.2019.11.11.10.50.46 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Mon, 11 Nov 2019 10:50:46 -0800 (PST) From: Evan Green To: Jens Axboe , Martin K Petersen Cc: Gwendal Grignou , Ming Lei , "Darrick J . Wong" , Alexis Savery , Douglas Anderson , Bart Van Assche , Evan Green , Chaitanya Kulkarni , linux-block@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v6 1/2] loop: Report EOPNOTSUPP properly Date: Mon, 11 Nov 2019 10:50:29 -0800 Message-Id: <20191111185030.215451-2-evgreen@chromium.org> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20191111185030.215451-1-evgreen@chromium.org> References: <20191111185030.215451-1-evgreen@chromium.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Properly plumb out EOPNOTSUPP from loop driver operations, which may get returned when for instance a discard operation is attempted but not supported by the underlying block device. Before this change, everything was reported in the log as an I/O error, which is scary and not helpful in debugging. Signed-off-by: Evan Green Reviewed-by: Ming Lei Reviewed-by: Bart Van Assche Reviewed-by: Martin K. Petersen Reviewed-by: Gwendal Grignou Reviewed-by: Chaitanya Kulkarni --- Changes in v6: - Updated tags Changes in v5: None Changes in v4: None Changes in v3: - Updated tags Changes in v2: - Unnested error if statement (Bart) drivers/block/loop.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff --git a/drivers/block/loop.c b/drivers/block/loop.c index f6f77eaa7217..d749156a3d88 100644 --- a/drivers/block/loop.c +++ b/drivers/block/loop.c @@ -458,7 +458,9 @@ static void lo_complete_rq(struct request *rq) if (!cmd->use_aio || cmd->ret < 0 || cmd->ret == blk_rq_bytes(rq) || req_op(rq) != REQ_OP_READ) { - if (cmd->ret < 0) + if (cmd->ret == -EOPNOTSUPP) + ret = BLK_STS_NOTSUPP; + else if (cmd->ret < 0) ret = BLK_STS_IOERR; goto end_io; } @@ -1940,7 +1942,10 @@ static void loop_handle_cmd(struct loop_cmd *cmd) failed: /* complete non-aio request */ if (!cmd->use_aio || ret) { - cmd->ret = ret ? -EIO : 0; + if (ret == -EOPNOTSUPP) + cmd->ret = ret; + else + cmd->ret = ret ? -EIO : 0; blk_mq_complete_request(rq); } } -- 2.21.0