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 E433EC64E75 for ; Thu, 26 Nov 2020 13:32:56 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 60A35206F7 for ; Thu, 26 Nov 2020 13:32:56 +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="CjPIChzw" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 60A35206F7 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 C38016B0078; Thu, 26 Nov 2020 08:32:55 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id BC0BD6B007B; Thu, 26 Nov 2020 08:32:55 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id A88A86B007D; Thu, 26 Nov 2020 08:32:55 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0029.hostedemail.com [216.40.44.29]) by kanga.kvack.org (Postfix) with ESMTP id 891B46B0078 for ; Thu, 26 Nov 2020 08:32:55 -0500 (EST) Received: from smtpin24.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay01.hostedemail.com (Postfix) with ESMTP id 56A32180AD801 for ; Thu, 26 Nov 2020 13:32:55 +0000 (UTC) X-FDA: 77526659910.24.oil46_12075b22737f Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin24.hostedemail.com (Postfix) with ESMTP id 365181A4A0 for ; Thu, 26 Nov 2020 13:32:55 +0000 (UTC) X-HE-Tag: oil46_12075b22737f X-Filterd-Recvd-Size: 7571 Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) by imf05.hostedemail.com (Postfix) with ESMTP for ; Thu, 26 Nov 2020 13:32:54 +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=gWvILBs/unlPFVG4AOLnxboO/+bknvtFOXROmqyYwK4=; b=CjPIChzwYtG/QaeC658LDWEXfx bQ7eHbmwbDhPUb2enPi4qZtJA1/emw6R5JTIIRgi26mzkzPfBbINYeqayfetW9JxGyPPSsG19JJlJ ebw7+ObEcmxVJzIUbJAAaygNlD9+rbCGnhOlYED/2ICjwkUe51uFd2MQy37hfnKEtz3xujAvEu+nX RQEs6hXZm0qoHHYOYDKNFSY+yltCGDjodouhO2f0Mla9n22AkTFgQkp41G3iNyQh/AsmJqJXOJhSw LD47e6WrcAnXP7jbMgOv+YfRgetetqtzpuugUuVslPzZlYgdItnJtUYXwuIHr/DTmgo2/2uEYKIhq gbPYuqUA==; 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 1kiGzM-00043O-Af; Thu, 26 Nov 2020 13:07:08 +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 25/44] block: remove ->bd_contains Date: Thu, 26 Nov 2020 14:04:03 +0100 Message-Id: <20201126130422.92945-26-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: Now that each hd_struct has a reference to the corresponding block_device, there is no need for the bd_contains pointer. Add a bdev_whole() helper to look up the whole device block_device struture instead. Signed-off-by: Christoph Hellwig Reviewed-by: Greg Kroah-Hartman Reviewed-by: Jan Kara Acked-by: Tejun Heo --- drivers/block/loop.c | 2 +- drivers/scsi/scsicam.c | 2 +- fs/block_dev.c | 22 ++++++++-------------- include/linux/blk_types.h | 4 +++- 4 files changed, 13 insertions(+), 17 deletions(-) diff --git a/drivers/block/loop.c b/drivers/block/loop.c index 26c7aafba7c5f8..c0df88b3300c41 100644 --- a/drivers/block/loop.c +++ b/drivers/block/loop.c @@ -1088,7 +1088,7 @@ static int loop_configure(struct loop_device *lo, f= mode_t mode, * here to avoid changing device under exclusive owner. */ if (!(mode & FMODE_EXCL)) { - claimed_bdev =3D bdev->bd_contains; + claimed_bdev =3D bdev_whole(bdev); error =3D bd_prepare_to_claim(bdev, claimed_bdev, loop_configure); if (error) goto out_putf; diff --git a/drivers/scsi/scsicam.c b/drivers/scsi/scsicam.c index 682cf08ab04153..f1553a453616fd 100644 --- a/drivers/scsi/scsicam.c +++ b/drivers/scsi/scsicam.c @@ -32,7 +32,7 @@ */ unsigned char *scsi_bios_ptable(struct block_device *dev) { - struct address_space *mapping =3D dev->bd_contains->bd_inode->i_mapping= ; + struct address_space *mapping =3D bdev_whole(dev)->bd_inode->i_mapping; unsigned char *res =3D NULL; struct page *page; =20 diff --git a/fs/block_dev.c b/fs/block_dev.c index 07b869c2ade501..73f45ae1d3d50c 100644 --- a/fs/block_dev.c +++ b/fs/block_dev.c @@ -119,7 +119,7 @@ int truncate_bdev_range(struct block_device *bdev, fm= ode_t mode, * under live filesystem. */ if (!(mode & FMODE_EXCL)) { - claimed_bdev =3D bdev->bd_contains; + claimed_bdev =3D bdev_whole(bdev); err =3D bd_prepare_to_claim(bdev, claimed_bdev, truncate_bdev_range); if (err) @@ -880,7 +880,6 @@ struct block_device *bdev_alloc(struct gendisk *disk,= u8 partno) spin_lock_init(&bdev->bd_size_lock); bdev->bd_disk =3D disk; bdev->bd_partno =3D partno; - bdev->bd_contains =3D NULL; bdev->bd_super =3D NULL; bdev->bd_inode =3D inode; bdev->bd_part_count =3D 0; @@ -1343,9 +1342,7 @@ static int __blkdev_get(struct block_device *bdev, = fmode_t mode) int ret; =20 if (!bdev->bd_openers) { - bdev->bd_contains =3D bdev; - - if (!bdev->bd_partno) { + if (!bdev_is_partition(bdev)) { ret =3D -ENXIO; bdev->bd_part =3D disk_get_part(disk, 0); if (!bdev->bd_part) @@ -1385,7 +1382,6 @@ static int __blkdev_get(struct block_device *bdev, = fmode_t mode) whole->bd_part_count++; mutex_unlock(&whole->bd_mutex); =20 - bdev->bd_contains =3D whole; bdev->bd_part =3D disk_get_part(disk, bdev->bd_partno); if (!bdev->bd_part || !bdev->bd_part->nr_sects) { __blkdev_put(whole, mode, 1); @@ -1400,7 +1396,7 @@ static int __blkdev_get(struct block_device *bdev, = fmode_t mode) if (bdev->bd_bdi =3D=3D &noop_backing_dev_info) bdev->bd_bdi =3D bdi_get(disk->queue->backing_dev_info); } else { - if (bdev->bd_contains =3D=3D bdev) { + if (!bdev_is_partition(bdev)) { ret =3D 0; if (bdev->bd_disk->fops->open) ret =3D bdev->bd_disk->fops->open(bdev, mode); @@ -1418,7 +1414,6 @@ static int __blkdev_get(struct block_device *bdev, = fmode_t mode) out_clear: disk_put_part(bdev->bd_part); bdev->bd_part =3D NULL; - bdev->bd_contains =3D NULL; return ret; } =20 @@ -1664,8 +1659,7 @@ static void __blkdev_put(struct block_device *bdev,= fmode_t mode, int for_part) disk_put_part(bdev->bd_part); bdev->bd_part =3D NULL; if (bdev_is_partition(bdev)) - victim =3D bdev->bd_contains; - bdev->bd_contains =3D NULL; + victim =3D bdev_whole(bdev); } else { if (!bdev_is_partition(bdev) && disk->fops->release) disk->fops->release(disk, mode); @@ -1684,6 +1678,7 @@ void blkdev_put(struct block_device *bdev, fmode_t = mode) mutex_lock(&bdev->bd_mutex); =20 if (mode & FMODE_EXCL) { + struct block_device *whole =3D bdev_whole(bdev); bool bdev_free; =20 /* @@ -1694,13 +1689,12 @@ void blkdev_put(struct block_device *bdev, fmode_= t mode) spin_lock(&bdev_lock); =20 WARN_ON_ONCE(--bdev->bd_holders < 0); - WARN_ON_ONCE(--bdev->bd_contains->bd_holders < 0); + WARN_ON_ONCE(--whole->bd_holders < 0); =20 - /* bd_contains might point to self, check in a separate step */ if ((bdev_free =3D !bdev->bd_holders)) bdev->bd_holder =3D NULL; - if (!bdev->bd_contains->bd_holders) - bdev->bd_contains->bd_holder =3D NULL; + if (!whole->bd_holders) + whole->bd_holder =3D NULL; =20 spin_unlock(&bdev_lock); =20 diff --git a/include/linux/blk_types.h b/include/linux/blk_types.h index 9698f459cc65c9..2e0a9bd9688d28 100644 --- a/include/linux/blk_types.h +++ b/include/linux/blk_types.h @@ -32,7 +32,6 @@ struct block_device { #ifdef CONFIG_SYSFS struct list_head bd_holder_disks; #endif - struct block_device * bd_contains; u8 bd_partno; struct hd_struct * bd_part; /* number of times partitions within this device have been opened. */ @@ -49,6 +48,9 @@ struct block_device { struct super_block *bd_fsfreeze_sb; } __randomize_layout; =20 +#define bdev_whole(_bdev) \ + ((_bdev)->bd_disk->part0.bdev) + #define bdev_kobj(_bdev) \ (&part_to_dev((_bdev)->bd_part)->kobj) =20 --=20 2.29.2