From patchwork Mon Jul 12 23:05:27 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Matteo Croce X-Patchwork-Id: 12372543 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,URIBL_BLOCKED,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 2E2FCC07E9C for ; Mon, 12 Jul 2021 23:07:47 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1432D60E0B for ; Mon, 12 Jul 2021 23:07:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233025AbhGLXKe (ORCPT ); Mon, 12 Jul 2021 19:10:34 -0400 Received: from mail-ej1-f52.google.com ([209.85.218.52]:40750 "EHLO mail-ej1-f52.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232911AbhGLXKe (ORCPT ); Mon, 12 Jul 2021 19:10:34 -0400 Received: by mail-ej1-f52.google.com with SMTP id o5so37814174ejy.7; Mon, 12 Jul 2021 16:07:43 -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=Y3koryDaOA6/9bcI8unsx1MLaBEFywHb4rwejNyG6tE=; b=odebTodqIjSudgZ0wWn8mRhvv5EVtcwMGyLnxA+BsQFqG8z+uyz+x7KJWGag9AAgpW qyZn+WaC9Hwvpb6pR7fCLaH++Q4Vv5mBIogvpVq+ol3DPLaWUajFlj0OgBc+DmlNI2VR 2eizfAbjAs3J0K+IT7sc3ev9kX5fu26mGHPtbzcrWfe0Sq1063EQWvRCuAWR9uYKL5Mr uDo2OX2cpyMuIhNl272O5hIGLmBtHxU6mwV8e3oRwNqsGnfTAnvNg3t0CHXF6kdrnX2g OsDNyw+QNbkE5RAcAm11GZinZLs0xLlvRxlGlVodwBwmZiAAVQ464awq053fhfL9pctL 6y3w== X-Gm-Message-State: AOAM531JtsunR/NIcqWW7idFutKXHhx/9if4OCfDZ9XOzORhy32N20S7 DLR71t9jD/LF/rE1AfYbRbgUsmrj40CvGg== X-Google-Smtp-Source: ABdhPJy4+ONUDQ4nc4RpW8p+lt4JGKTRBN+97WTCckeOjf7aHhhjhSKQulegxLC/YoP1FRZxBqzTEA== X-Received: by 2002:a17:907:7d8b:: with SMTP id oz11mr1714569ejc.143.1626131262696; Mon, 12 Jul 2021 16:07:42 -0700 (PDT) Received: from msft-t490s.fritz.box (host-95-250-115-52.retail.telecomitalia.it. [95.250.115.52]) by smtp.gmail.com with ESMTPSA id h3sm5494111ejf.53.2021.07.12.16.07.41 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 12 Jul 2021 16:07:42 -0700 (PDT) From: Matteo Croce To: linux-block@vger.kernel.org, linux-fsdevel@vger.kernel.org, Jens Axboe , Christoph Hellwig 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 , JeffleXu Subject: [PATCH v5 3/6] block: add ioctl to read the disk sequence number Date: Tue, 13 Jul 2021 01:05:27 +0200 Message-Id: <20210712230530.29323-4-mcroce@linux.microsoft.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210712230530.29323-1-mcroce@linux.microsoft.com> References: <20210712230530.29323-1-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 Reviewed-by: Christoph Hellwig 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 24beec9ca9c9..0c3a4a53fa11 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)