From patchwork Sun Jul 25 05:54:53 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 12398017 X-Patchwork-Delegate: snitzer@redhat.com 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=-13.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS 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 9299CC4338F for ; Sun, 25 Jul 2021 05:57:11 +0000 (UTC) Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id CCC1660F13 for ; Sun, 25 Jul 2021 05:57:10 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org CCC1660F13 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=lst.de Authentication-Results: mail.kernel.org; spf=tempfail smtp.mailfrom=redhat.com Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-112-lnuUhJ5UNB2PfqISj_6TfQ-1; Sun, 25 Jul 2021 01:57:07 -0400 X-MC-Unique: lnuUhJ5UNB2PfqISj_6TfQ-1 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 59B888042E2; Sun, 25 Jul 2021 05:57:03 +0000 (UTC) Received: from colo-mx.corp.redhat.com (colo-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.20]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 09E3D60C0F; Sun, 25 Jul 2021 05:57:03 +0000 (UTC) Received: from lists01.pubmisc.prod.ext.phx2.redhat.com (lists01.pubmisc.prod.ext.phx2.redhat.com [10.5.19.33]) by colo-mx.corp.redhat.com (Postfix) with ESMTP id 8F7CE180BAB3; Sun, 25 Jul 2021 05:56:59 +0000 (UTC) Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.rdu2.redhat.com [10.11.54.6]) by lists01.pubmisc.prod.ext.phx2.redhat.com (8.13.8/8.13.8) with ESMTP id 16P5uWiN010413 for ; Sun, 25 Jul 2021 01:56:33 -0400 Received: by smtp.corp.redhat.com (Postfix) id E60282166BA3; Sun, 25 Jul 2021 05:56:31 +0000 (UTC) Received: from mimecast-mx02.redhat.com (mimecast05.extmail.prod.ext.rdu2.redhat.com [10.11.55.21]) by smtp.corp.redhat.com (Postfix) with ESMTPS id E16EB2166B49 for ; Sun, 25 Jul 2021 05:56:28 +0000 (UTC) Received: from us-smtp-1.mimecast.com (us-smtp-delivery-1.mimecast.com [207.211.31.120]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 6577B80B71D for ; Sun, 25 Jul 2021 05:56:28 +0000 (UTC) Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-523-nch5GYn-O2ucCNuB766DzQ-1; Sun, 25 Jul 2021 01:56:26 -0400 X-MC-Unique: nch5GYn-O2ucCNuB766DzQ-1 Received: from [2001:4bb8:184:87c5:a8b3:bdfd:fc9b:6250] (helo=localhost) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1m7X7A-00Cphh-1i; Sun, 25 Jul 2021 05:56:00 +0000 From: Christoph Hellwig To: Jens Axboe , Mike Snitzer Date: Sun, 25 Jul 2021 07:54:53 +0200 Message-Id: <20210725055458.29008-4-hch@lst.de> In-Reply-To: <20210725055458.29008-1-hch@lst.de> References: <20210725055458.29008-1-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 X-Mimecast-Impersonation-Protect: Policy=CLT - Impersonation Protection Definition; Similar Internal Domain=false; Similar Monitored External Domain=false; Custom External Domain=false; Mimecast External Domain=false; Newly Observed Domain=false; Internal User Name=false; Custom Display Name List=false; Reply-to Address Mismatch=false; Targeted Threat Dictionary=false; Mimecast Threat Dictionary=false; Custom Threat Dictionary=false X-Scanned-By: MIMEDefang 2.78 on 10.11.54.6 X-loop: dm-devel@redhat.com Cc: linux-block@vger.kernel.org, dm-devel@redhat.com Subject: [dm-devel] [PATCH 3/8] block: look up holders by bdev X-BeenThere: dm-devel@redhat.com X-Mailman-Version: 2.1.12 Precedence: junk List-Id: device-mapper development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: dm-devel-bounces@redhat.com Errors-To: dm-devel-bounces@redhat.com X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=dm-devel-bounces@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Invert they way the holder relations are tracked. This very slightly reduces the memory overhead for partitioned devices. Signed-off-by: Christoph Hellwig --- block/genhd.c | 3 +++ block/holder.c | 18 +++++++++--------- fs/block_dev.c | 3 --- include/linux/blk_types.h | 3 --- include/linux/genhd.h | 4 +++- 5 files changed, 15 insertions(+), 16 deletions(-) diff --git a/block/genhd.c b/block/genhd.c index af4d2ab4a633..e2708a4a7a47 100644 --- a/block/genhd.c +++ b/block/genhd.c @@ -1263,6 +1263,9 @@ struct gendisk *__alloc_disk_node(int minors, int node_id) disk_to_dev(disk)->class = &block_class; disk_to_dev(disk)->type = &disk_type; device_initialize(disk_to_dev(disk)); +#ifdef CONFIG_BLOCK_HOLDER_DEPRECATED + INIT_LIST_HEAD(&disk->slave_bdevs); +#endif return disk; out_destroy_part_tbl: diff --git a/block/holder.c b/block/holder.c index 960654a71342..11e65d99a9fb 100644 --- a/block/holder.c +++ b/block/holder.c @@ -3,7 +3,7 @@ struct bd_holder_disk { struct list_head list; - struct gendisk *disk; + struct block_device *bdev; int refcnt; }; @@ -12,8 +12,8 @@ static struct bd_holder_disk *bd_find_holder_disk(struct block_device *bdev, { struct bd_holder_disk *holder; - list_for_each_entry(holder, &bdev->bd_holder_disks, list) - if (holder->disk == disk) + list_for_each_entry(holder, &disk->slave_bdevs, list) + if (holder->bdev == bdev) return holder; return NULL; } @@ -61,7 +61,7 @@ int bd_link_disk_holder(struct block_device *bdev, struct gendisk *disk) struct bd_holder_disk *holder; int ret = 0; - mutex_lock(&bdev->bd_disk->open_mutex); + mutex_lock(&disk->open_mutex); WARN_ON_ONCE(!bdev->bd_holder); @@ -82,7 +82,7 @@ int bd_link_disk_holder(struct block_device *bdev, struct gendisk *disk) } INIT_LIST_HEAD(&holder->list); - holder->disk = disk; + holder->bdev = bdev; holder->refcnt = 1; ret = add_symlink(disk->slave_dir, bdev_kobj(bdev)); @@ -93,7 +93,7 @@ int bd_link_disk_holder(struct block_device *bdev, struct gendisk *disk) if (ret) goto out_del; - list_add(&holder->list, &bdev->bd_holder_disks); + list_add(&holder->list, &disk->slave_bdevs); goto out_unlock; out_del: @@ -101,7 +101,7 @@ int bd_link_disk_holder(struct block_device *bdev, struct gendisk *disk) out_free: kfree(holder); out_unlock: - mutex_unlock(&bdev->bd_disk->open_mutex); + mutex_unlock(&disk->open_mutex); return ret; } EXPORT_SYMBOL_GPL(bd_link_disk_holder); @@ -120,7 +120,7 @@ void bd_unlink_disk_holder(struct block_device *bdev, struct gendisk *disk) { struct bd_holder_disk *holder; - mutex_lock(&bdev->bd_disk->open_mutex); + mutex_lock(&disk->open_mutex); holder = bd_find_holder_disk(bdev, disk); if (!WARN_ON_ONCE(holder == NULL) && !--holder->refcnt) { del_symlink(disk->slave_dir, bdev_kobj(bdev)); @@ -128,6 +128,6 @@ void bd_unlink_disk_holder(struct block_device *bdev, struct gendisk *disk) list_del_init(&holder->list); kfree(holder); } - mutex_unlock(&bdev->bd_disk->open_mutex); + mutex_unlock(&disk->open_mutex); } EXPORT_SYMBOL_GPL(bd_unlink_disk_holder); diff --git a/fs/block_dev.c b/fs/block_dev.c index 7825d152634e..22646906ddaa 100644 --- a/fs/block_dev.c +++ b/fs/block_dev.c @@ -900,9 +900,6 @@ struct block_device *bdev_alloc(struct gendisk *disk, u8 partno) bdev->bd_disk = disk; bdev->bd_partno = partno; bdev->bd_inode = inode; -#ifdef CONFIG_BLOCK_HOLDER_DEPRECATED - INIT_LIST_HEAD(&bdev->bd_holder_disks); -#endif bdev->bd_stats = alloc_percpu(struct disk_stats); if (!bdev->bd_stats) { iput(inode); diff --git a/include/linux/blk_types.h b/include/linux/blk_types.h index 7a4e139d24ef..e92735655684 100644 --- a/include/linux/blk_types.h +++ b/include/linux/blk_types.h @@ -34,9 +34,6 @@ struct block_device { void * bd_holder; int bd_holders; bool bd_write_holder; -#ifdef CONFIG_BLOCK_HOLDER_DEPRECATED - struct list_head bd_holder_disks; -#endif struct kobject *bd_holder_dir; u8 bd_partno; spinlock_t bd_size_lock; /* for bd_inode->i_size updates */ diff --git a/include/linux/genhd.h b/include/linux/genhd.h index 6831d74f2002..26c8557e2714 100644 --- a/include/linux/genhd.h +++ b/include/linux/genhd.h @@ -159,7 +159,9 @@ struct gendisk { unsigned open_partitions; /* number of open partitions */ struct kobject *slave_dir; - +#ifdef CONFIG_BLOCK_HOLDER_DEPRECATED + struct list_head slave_bdevs; +#endif struct timer_rand_state *random; atomic_t sync_io; /* RAID */ struct disk_events *ev;