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 Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 56C87EB64DA for ; Tue, 4 Jul 2023 14:07:19 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id A7F4B28007D; Tue, 4 Jul 2023 10:07:18 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id A2FD3280076; Tue, 4 Jul 2023 10:07:18 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 8F7FB28007D; Tue, 4 Jul 2023 10:07:18 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0016.hostedemail.com [216.40.44.16]) by kanga.kvack.org (Postfix) with ESMTP id 82B9B280076 for ; Tue, 4 Jul 2023 10:07:18 -0400 (EDT) Received: from smtpin06.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay10.hostedemail.com (Postfix) with ESMTP id DB38AC0A52 for ; Tue, 4 Jul 2023 14:07:17 +0000 (UTC) X-FDA: 80974106514.06.0900432 Received: from mail-pl1-f172.google.com (mail-pl1-f172.google.com [209.85.214.172]) by imf29.hostedemail.com (Postfix) with ESMTP id CA5411201B1 for ; Tue, 4 Jul 2023 14:06:30 +0000 (UTC) Authentication-Results: imf29.hostedemail.com; dkim=none; dmarc=fail reason="SPF not aligned (relaxed), No valid DKIM" header.from=acm.org (policy=none); spf=pass (imf29.hostedemail.com: domain of bart.vanassche@gmail.com designates 209.85.214.172 as permitted sender) smtp.mailfrom=bart.vanassche@gmail.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1688479591; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=JV2SCOEdB9t0w6tigDexjJMYhGF54ZwsLlYmJ1gE7wU=; b=Knl7iAIoPaJ9gy9V5WUvIqqAnJ2LLh2aTAgr6xw3EmdrVio6LruhY7pqzAI36uS0V5FXEW R6rh2tGvAgbl0djO76QqR+Oe9rx3eCdQ2NpPtd/5/QC9mUggG0ccScLNdxuGalIqoKnnHG Yrxvc1+hw9gax8HJgAUtBELMvYQ6GfI= ARC-Authentication-Results: i=1; imf29.hostedemail.com; dkim=none; dmarc=fail reason="SPF not aligned (relaxed), No valid DKIM" header.from=acm.org (policy=none); spf=pass (imf29.hostedemail.com: domain of bart.vanassche@gmail.com designates 209.85.214.172 as permitted sender) smtp.mailfrom=bart.vanassche@gmail.com ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1688479591; a=rsa-sha256; cv=none; b=MdG8g36ceyqK1wkRk+tcgkmnf0ekrj/Mh+Dj4PXgYTzM0kYjXjR53hpqwuGIAONLm/iUFl T5xiZB/d8I5FoFgAo9Pbn6ww1CnnI5qZcNlAx1G5Fuf4aNomCF/2aAaxtJpYHPYEsMjQtb hxPZHdy0YDB+PxrDZ6PMXsVRYVcc0VA= Received: by mail-pl1-f172.google.com with SMTP id d9443c01a7336-1b7f2239bfdso44612405ad.1 for ; Tue, 04 Jul 2023 07:06:30 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1688479590; x=1691071590; h=content-transfer-encoding:in-reply-to:from:references:cc:to :content-language:subject:user-agent:mime-version:date:message-id :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=JV2SCOEdB9t0w6tigDexjJMYhGF54ZwsLlYmJ1gE7wU=; b=eWojqebLFq4kKPiDSCwRTwy5lkii5HsTtvysRiD37auDYvxO89ItANOpna5ldX6A0s V8zYBHNZBH4NcU2QCCte/muv0pRTG1hSNUYMAX8sTkkpZ0cHkMdMw/JA/dzYDCvl5ESt bPHtmm0K8d8kzhT3QAYbaFkZBu5KY1apbtK8uHU12k5EvIGhdwo5zpN7C+73WqJ+S4qC CV7r+347NbJ8MvquPGB3tQF86XDbP+QiXPmtGQIDAr+6rYS/WHeNmvIz8I9obVAEyf0V UuKs4imW4B+3hKxFYb/YJMTK6B/edYZK+pYBCqzYsDm8TY7qg2drvu+KcL8y206FVB4V JD7g== X-Gm-Message-State: ABy/qLbzJDuMBiQwrjkMaWiDJsH2KxTWjXpmIigDVu5X8AiM+aRj4tx5 IrzYN2prHUF8/qUD6kSoo2E= X-Google-Smtp-Source: APBJJlEESj5502hCCjnCrW5aNdhMviGxH5NXIz8SFwBF+614aVB6e0+1hJtWMTw8TJzZNuQy8olTNg== X-Received: by 2002:a17:903:447:b0:1b8:a31b:ac85 with SMTP id iw7-20020a170903044700b001b8a31bac85mr2719760plb.41.1688479589749; Tue, 04 Jul 2023 07:06:29 -0700 (PDT) Received: from [192.168.50.14] ([98.51.102.78]) by smtp.gmail.com with ESMTPSA id jk4-20020a170903330400b001b672af624esm13083569plb.164.2023.07.04.07.06.26 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 04 Jul 2023 07:06:29 -0700 (PDT) Message-ID: Date: Tue, 4 Jul 2023 07:06:26 -0700 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.11.0 Subject: Re: [PATCH 01/32] block: Provide blkdev_get_handle_* functions Content-Language: en-US To: Jan Kara , linux-block@vger.kernel.org Cc: linux-fsdevel@vger.kernel.org, Jens Axboe , Christoph Hellwig , Alasdair Kergon , Andrew Morton , Anna Schumaker , Chao Yu , Christian Borntraeger , "Darrick J. Wong" , Dave Kleikamp , David Sterba , dm-devel@redhat.com, drbd-dev@lists.linbit.com, Gao Xiang , Jack Wang , Jaegeuk Kim , jfs-discussion@lists.sourceforge.net, Joern Engel , Joseph Qi , Kent Overstreet , linux-bcache@vger.kernel.org, linux-btrfs@vger.kernel.org, linux-erofs@lists.ozlabs.org, linux-ext4@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net, linux-mm@kvack.org, linux-mtd@lists.infradead.org, linux-nfs@vger.kernel.org, linux-nilfs@vger.kernel.org, linux-nvme@lists.infradead.org, linux-pm@vger.kernel.org, linux-raid@vger.kernel.org, linux-s390@vger.kernel.org, linux-scsi@vger.kernel.org, linux-xfs@vger.kernel.org, "Md. Haris Iqbal" , Mike Snitzer , Minchan Kim , ocfs2-devel@oss.oracle.com, reiserfs-devel@vger.kernel.org, Sergey Senozhatsky , Song Liu , Sven Schnelle , target-devel@vger.kernel.org, Ted Tso , Trond Myklebust , xen-devel@lists.xenproject.org References: <20230629165206.383-1-jack@suse.cz> <20230704122224.16257-1-jack@suse.cz> From: Bart Van Assche In-Reply-To: <20230704122224.16257-1-jack@suse.cz> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam09 X-Rspamd-Queue-Id: CA5411201B1 X-Stat-Signature: hyjgze5r4yax6i6jdqwocuoax8as7c7u X-Rspam-User: X-HE-Tag: 1688479590-779555 X-HE-Meta: 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 NuA5pP+W hWhfXUkqe/C1NqsSUqEdR7JUitSSw05aacTh8rwFsz6yJShh5uNRjkjyZ962IM0VU5MyTy/4J9Xqw+benfUNNXx8ZVMtl/3sA1f/SSBFC/s9RCuG9EAHIlcL7gS1hhcjqdb6pjbUxLQMtVJ2yvT+ii8C75lb6dyFMu89/icOM51sgeVxVO6TVh7P8LIsDITMy74cW4b8R7hTRpLxPHkzp55rg6BDXv6lFSj/LrP6bC8qMVnsm7CL6WVf2GZIdWzDoSDASQaJ4ExypgipvtPlGeIjGryqaM6lVrwjSPDK+pU6HFsd0ikdXEiGIXkkSuwBJtlRK+1iembZYR2nuWTf+tZO5Aei09CW1h9fy64zKzOhoWBCUuMJmJMfcOVuCMnoxY73s7FBaA2LDmB6mgVt+MDIb/734xXDUI1qJGaRU4p/If0DXTHDkv1WvvT+VtWZlIaJ4iU4Gnd1ciHw0Bf0Jm8gG/3qV+vYzGV+NWNWTmak+jODUfWM9pvcC4hCFJ8wQlkED4xVGSbAG8Llk0x+Lj9tsMes8cGxmTHd9xV1n2xr7gWhyimy/dztWRtMJO55BEXCZhnCliG/LuO8WXEXJA4t9rJ+vJq80RKB6T2eESLCkGDN0c3soYLV4dtNuEeXBehNprV8UA+WA1q8wFCy7mVxOhw== 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: On 7/4/23 05:21, Jan Kara wrote: > +struct bdev_handle { > + struct block_device *bdev; > + void *holder; > +}; Please explain in the patch description why a holder pointer is introduced in struct bdev_handle and how it relates to the bd_holder pointer in struct block_device. Is one of the purposes of this patch series perhaps to add support for multiple holders per block device? Thanks, Bart.