From patchwork Thu May 20 13:56:18 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Matteo Croce X-Patchwork-Id: 12270363 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=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,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 C7966C43461 for ; Thu, 20 May 2021 13:59:53 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A438A6121E for ; Thu, 20 May 2021 13:59:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237971AbhETOBM (ORCPT ); Thu, 20 May 2021 10:01:12 -0400 Received: from mail-ed1-f42.google.com ([209.85.208.42]:45899 "EHLO mail-ed1-f42.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S243477AbhETN7t (ORCPT ); Thu, 20 May 2021 09:59:49 -0400 Received: by mail-ed1-f42.google.com with SMTP id a25so19487724edr.12; Thu, 20 May 2021 06:58:22 -0700 (PDT) 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=aJu1+YCrkeg1VrMRtE/40B8yQYYhV/BJgPpoTp2RURs=; b=GPe9f7qMOcG4F3dWVeOSdEuh7uawc7xSej5EBKHRHdYCVNIYwmT1lpEcGQTCFX9MmN B08+pxGLxPNrIPpB/JDTqSsen9SX49qci9LSOXyEsN3N0zXA9aSQb5S0QFk8vSdQOGl9 zQXS2yur7ubxUKy9YD7NS5p3YMrVDC7clAFb9SSKkHEowXjdMo259zt5A5rus4hQtDbz asUu0z8MkX7HWd3SgpAexcUe5FUnNrWdwINwmHxj1/kfWNFlNJ1Y4X2KgRQY6a53xI5o o9wfuVSevLjVM2Y45a1TRiTendp1i//WLxKIRlF0dsd+cg1P2N4lO2P4+6Bd++xjZ5kV i3fw== X-Gm-Message-State: AOAM532dNHfuna/LNo4Alz3dRM33meRiEIhH3/NbHqpDFTZp1ku1vFod LW6HQ3YL8bajzhIact5EzSeRbGfFED4BIt2Q X-Google-Smtp-Source: ABdhPJxCY1xOrV4Ti2X0wSEBgusWXm8TrgBIxXsyRpVDxsMVDSdbwW2OmgmC+9XY5LhxS0DX4F7fNA== X-Received: by 2002:a05:6402:4414:: with SMTP id y20mr5312263eda.41.1621519101911; Thu, 20 May 2021 06:58:21 -0700 (PDT) Received: from msft-t490s.teknoraver.net (net-5-94-253-60.cust.vodafonedsl.it. [5.94.253.60]) by smtp.gmail.com with ESMTPSA id 9sm1434492ejv.73.2021.05.20.06.58.20 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 20 May 2021 06:58:21 -0700 (PDT) From: Matteo Croce To: linux-block@vger.kernel.org, linux-fsdevel@vger.kernel.org Cc: linux-kernel@vger.kernel.org, Lennart Poettering , Luca Boccassi , Jens Axboe , Alexander Viro , Damien Le Moal , Tejun Heo , =?utf-8?q?Javier_Gonz=C3=A1lez?= , Niklas Cassel , Johannes Thumshirn , Hannes Reinecke , Matthew Wilcox , Christoph Hellwig , JeffleXu Subject: [PATCH v2 2/6] block: add ioctl to read the disk sequence number Date: Thu, 20 May 2021 15:56:18 +0200 Message-Id: <20210520135622.44625-3-mcroce@linux.microsoft.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210520135622.44625-1-mcroce@linux.microsoft.com> References: <20210520135622.44625-1-mcroce@linux.microsoft.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org From: Matteo Croce Add a new BLKGETDISKSEQ ioctl which retrieves the disk sequence number from the genhd structure. # ./getdiskseq /dev/loop* /dev/loop0: 13 /dev/loop0p1: 13 /dev/loop0p2: 13 /dev/loop0p3: 13 /dev/loop1: 14 /dev/loop1p1: 14 /dev/loop1p2: 14 /dev/loop2: 5 /dev/loop3: 6 Signed-off-by: Matteo Croce --- block/ioctl.c | 2 ++ include/uapi/linux/fs.h | 1 + 2 files changed, 3 insertions(+) diff --git a/block/ioctl.c b/block/ioctl.c index 8ba1ed8defd0..32b339bbaf95 100644 --- a/block/ioctl.c +++ b/block/ioctl.c @@ -469,6 +469,8 @@ static int blkdev_common_ioctl(struct block_device *bdev, fmode_t mode, BLKDEV_DISCARD_SECURE); case BLKZEROOUT: return blk_ioctl_zeroout(bdev, mode, arg); + case BLKGETDISKSEQ: + return put_u64(argp, bdev->bd_disk->diskseq); case BLKREPORTZONE: return blkdev_report_zones_ioctl(bdev, mode, cmd, arg); case BLKRESETZONE: diff --git a/include/uapi/linux/fs.h b/include/uapi/linux/fs.h index 4c32e97dcdf0..bdf7b404b3e7 100644 --- a/include/uapi/linux/fs.h +++ b/include/uapi/linux/fs.h @@ -184,6 +184,7 @@ struct fsxattr { #define BLKSECDISCARD _IO(0x12,125) #define BLKROTATIONAL _IO(0x12,126) #define BLKZEROOUT _IO(0x12,127) +#define BLKGETDISKSEQ _IOR(0x12,128,__u64) /* * A jump here: 130-136 are reserved for zoned block devices * (see uapi/linux/blkzoned.h)