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=-16.5 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,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 3B84FC8301C for ; Thu, 26 Nov 2020 13:07:18 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id B407421D7E for ; Thu, 26 Nov 2020 13:07:17 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="WipNHSiT" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org B407421D7E Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=lst.de Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 52AF56B0080; Thu, 26 Nov 2020 08:07:00 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 27B406B0087; Thu, 26 Nov 2020 08:07:00 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 05A016B0082; Thu, 26 Nov 2020 08:06:59 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0183.hostedemail.com [216.40.44.183]) by kanga.kvack.org (Postfix) with ESMTP id D96656B0081 for ; Thu, 26 Nov 2020 08:06:59 -0500 (EST) Received: from smtpin01.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay01.hostedemail.com (Postfix) with ESMTP id A5DB4180AD815 for ; Thu, 26 Nov 2020 13:06:59 +0000 (UTC) X-FDA: 77526594558.01.can34_100693e2737f Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin01.hostedemail.com (Postfix) with ESMTP id 8474F1004E410 for ; Thu, 26 Nov 2020 13:06:59 +0000 (UTC) X-HE-Tag: can34_100693e2737f X-Filterd-Recvd-Size: 4542 Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) by imf42.hostedemail.com (Postfix) with ESMTP for ; Thu, 26 Nov 2020 13:06:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=Content-Transfer-Encoding:MIME-Version: References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To: Content-Type:Content-ID:Content-Description; bh=qLuO7hD0TG0p9aylN+kHqBJxf5z3v4FVxxZ2M17hRmY=; b=WipNHSiTxaCf/i02olOf7S3b9k 7tumqyBklwAOPoXqVFvK7+2BEqr7y+sx5mtON0mAzzW3MNkz4zrs+oOdvLTnVFxaaiMonNJfLIy8Q mg8VT4WS4Ip5pd4gfxLpdNLWZoV6OX52On+8eE2jJEIcq7Cp7fEZVK3+QcKPIzI836DMs1oSmZ5mn CI/Pdisi9YSbIPpv0OjyO44mtEppEv4VK/NnydCG5MxTm7rW/g9HPg4FdYgn79eOrdDjUnC2veigu rt+xk0G2+KPdni2kRxB8tq3rtjl7wPFlb2kyTIaT/RrtRyhEAMkAYShxe7iJog3pPC+knYv7531E4 QzH7l/gQ==; Received: from [2001:4bb8:18c:1dd6:27b8:b8a1:c13e:ceb1] (helo=localhost) by casper.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1kiGyz-0003y8-VM; Thu, 26 Nov 2020 13:06:46 +0000 From: Christoph Hellwig To: Jens Axboe Cc: Tejun Heo , Josef Bacik , Coly Li , Mike Snitzer , Greg Kroah-Hartman , Jan Kara , Johannes Thumshirn , dm-devel@redhat.com, Jan Kara , linux-block@vger.kernel.org, linux-bcache@vger.kernel.org, linux-mtd@lists.infradead.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 09/44] dm: remove the block_device reference in struct mapped_device Date: Thu, 26 Nov 2020 14:03:47 +0100 Message-Id: <20201126130422.92945-10-hch@lst.de> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201126130422.92945-1-hch@lst.de> References: <20201126130422.92945-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Content-Transfer-Encoding: quoted-printable X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Get rid of the long-lasting struct block_device reference in struct mapped_device. The only remaining user is the freeze code, where we can trivially look up the block device at freeze time and release the reference at thaw time. Signed-off-by: Christoph Hellwig Acked-by: Mike Snitzer --- drivers/md/dm-core.h | 2 -- drivers/md/dm.c | 25 ++++++++++++++----------- 2 files changed, 14 insertions(+), 13 deletions(-) diff --git a/drivers/md/dm-core.h b/drivers/md/dm-core.h index aace147effcacb..086d293c2b036c 100644 --- a/drivers/md/dm-core.h +++ b/drivers/md/dm-core.h @@ -102,8 +102,6 @@ struct mapped_device { /* kobject and completion */ struct dm_kobject_holder kobj_holder; =20 - struct block_device *bdev; - struct dm_stats stats; =20 /* for blk-mq request-based DM support */ diff --git a/drivers/md/dm.c b/drivers/md/dm.c index ab0a8335f098d9..48051db006f30c 100644 --- a/drivers/md/dm.c +++ b/drivers/md/dm.c @@ -1744,11 +1744,6 @@ static void cleanup_mapped_device(struct mapped_de= vice *md) =20 cleanup_srcu_struct(&md->io_barrier); =20 - if (md->bdev) { - bdput(md->bdev); - md->bdev =3D NULL; - } - mutex_destroy(&md->suspend_lock); mutex_destroy(&md->type_lock); mutex_destroy(&md->table_devices_lock); @@ -1840,10 +1835,6 @@ static struct mapped_device *alloc_dev(int minor) if (!md->wq) goto bad; =20 - md->bdev =3D bdget_disk(md->disk, 0); - if (!md->bdev) - goto bad; - dm_stats_init(&md->stats); =20 /* Populate the mapping, nobody knows we exist yet */ @@ -2384,11 +2375,16 @@ struct dm_table *dm_swap_table(struct mapped_devi= ce *md, struct dm_table *table) */ static int lock_fs(struct mapped_device *md) { + struct block_device *bdev; int r; =20 WARN_ON(test_bit(DMF_FROZEN, &md->flags)); =20 - r =3D freeze_bdev(md->bdev); + bdev =3D bdget_disk(md->disk, 0); + if (!bdev) + return -ENOMEM; + r =3D freeze_bdev(bdev); + bdput(bdev); if (!r) set_bit(DMF_FROZEN, &md->flags); return r; @@ -2396,9 +2392,16 @@ static int lock_fs(struct mapped_device *md) =20 static void unlock_fs(struct mapped_device *md) { + struct block_device *bdev; + if (!test_bit(DMF_FROZEN, &md->flags)) return; - thaw_bdev(md->bdev); + + bdev =3D bdget_disk(md->disk, 0); + if (!bdev) + return; + thaw_bdev(bdev); + bdput(bdev); clear_bit(DMF_FROZEN, &md->flags); } =20 --=20 2.29.2