From patchwork Wed Jun 23 10:58:54 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Matteo Croce X-Patchwork-Id: 12339565 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 1523FC4743C for ; Wed, 23 Jun 2021 10:59:54 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id EB8406108E for ; Wed, 23 Jun 2021 10:59:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230182AbhFWLCK (ORCPT ); Wed, 23 Jun 2021 07:02:10 -0400 Received: from mail-wr1-f48.google.com ([209.85.221.48]:33385 "EHLO mail-wr1-f48.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230174AbhFWLCJ (ORCPT ); Wed, 23 Jun 2021 07:02:09 -0400 Received: by mail-wr1-f48.google.com with SMTP id d11so2200329wrm.0; Wed, 23 Jun 2021 03:59:50 -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=nFvMg7PVYmtnD+YGQLAR7G7X1h+cBy4317unAM44+D/o81afAofnKztFWqlW3FBNNH 1HpDpKQ3fsG9jkEnuFy0pqfQt8uLs7xkRvxldHpss2Oa2Svd8XZDHwdVG+NHJFUZYhfQ 9+kdvhRKaXLGE2WVtl8Qq7xS8cf4aZKe2QSLLvAe1tFquzSg7eYKNPyu6K4WVOKXfkvV n+xAVUcNkXapsLMMeeoDXIQ+1avx5YpNauJMRGeDNKx41QfvLIQC91UeRvEGx9vFvskO 3t27lai2cqac34QrCsPjKdRTpzJkb1mI3eHGxc3zMjvVyI2yxW3JbwUe3x5pdqO/nrJJ /e9Q== X-Gm-Message-State: AOAM532ZrWy78A0s4bjYvRLdRgLMP/6yrUx6PmvW6ePJFJyqEPsTjcFe tiHkGEtbBxHRA6h4CO0fL3+M9ZR+dhHaQQ== X-Google-Smtp-Source: ABdhPJzPlLp3WHs6yTVEK2Y51Df5ofPOSUEgqWhrBhjrpHROc+LqUnoP+63NfjJzIfbcCZFzogB17A== X-Received: by 2002:a05:6000:144b:: with SMTP id v11mr8805568wrx.421.1624445990205; Wed, 23 Jun 2021 03:59:50 -0700 (PDT) Received: from msft-t490s.. (mob-176-246-29-26.net.vodafone.it. [176.246.29.26]) by smtp.gmail.com with ESMTPSA id r2sm2659458wrv.39.2021.06.23.03.59.47 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 23 Jun 2021 03:59:49 -0700 (PDT) From: Matteo Croce To: linux-block@vger.kernel.org, linux-fsdevel@vger.kernel.org, Jens Axboe Cc: linux-kernel@vger.kernel.org, Lennart Poettering , Luca Boccassi , 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 v3 2/6] block: add ioctl to read the disk sequence number Date: Wed, 23 Jun 2021 12:58:54 +0200 Message-Id: <20210623105858.6978-3-mcroce@linux.microsoft.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210623105858.6978-1-mcroce@linux.microsoft.com> References: <20210623105858.6978-1-mcroce@linux.microsoft.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@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)