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Wed, 25 Nov 2020 11:23:02 -0500 Received: by smtp.corp.redhat.com (Postfix) id 06F242166B2B; Wed, 25 Nov 2020 16:23:02 +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 018132166B29 for ; Wed, 25 Nov 2020 16:22:59 +0000 (UTC) Received: from us-smtp-1.mimecast.com (us-smtp-1.mimecast.com [207.211.31.81]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-SHA384 (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id D979B802A5D for ; Wed, 25 Nov 2020 16:22:59 +0000 (UTC) Received: from verein.lst.de (verein.lst.de [213.95.11.211]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-591-vkmhNliJMzuVHu1K2LDw9g-1; Wed, 25 Nov 2020 11:22:55 -0500 X-MC-Unique: vkmhNliJMzuVHu1K2LDw9g-1 Received: by verein.lst.de (Postfix, from userid 2407) id 4507168B02; Wed, 25 Nov 2020 17:22:50 +0100 (CET) Date: Wed, 25 Nov 2020 17:22:50 +0100 From: Christoph Hellwig To: Jan Kara Message-ID: <20201125162250.GA795@lst.de> References: <20201124132751.3747337-1-hch@lst.de> <20201124132751.3747337-5-hch@lst.de> <20201125122953.GH16944@quack2.suse.cz> MIME-Version: 1.0 In-Reply-To: <20201125122953.GH16944@quack2.suse.cz> User-Agent: Mutt/1.5.17 (2007-11-01) 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: Jens Axboe , linux-fsdevel@vger.kernel.org, Mike Snitzer , Konrad Rzeszutek Wilk , Greg Kroah-Hartman , Jan Kara , Josef Bacik , Coly Li , linux-block@vger.kernel.org, Richard Weinberger , dm-devel@redhat.com, linux-mtd@lists.infradead.org, linux-mm@kvack.org, Johannes Thumshirn , Tejun Heo , xen-devel@lists.xenproject.org, linux-bcache@vger.kernel.org, Christoph Hellwig Subject: Re: [dm-devel] [PATCH 04/45] fs: simplify freeze_bdev/thaw_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 10.5.11.13 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 Content-Disposition: inline Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit On Wed, Nov 25, 2020 at 01:29:53PM +0100, Jan Kara wrote: > > mutex_unlock(&bdev->bd_fsfreeze_mutex); > > - return sb; /* thaw_bdev releases s->s_umount */ > > + return error; /* thaw_bdev releases s->s_umount */ > > The comment about thaw_bdev() seems to be stale? At least I don't see what > it's speaking about... Yes, this comment seems long stale. I think in the very early days we held s_umount on frozen file system, which caused all kinds of problems. > > mutex_unlock(&bdev->bd_fsfreeze_mutex); > > - return error; > > + return 0; > > But we now won't return -EINVAL if this gets called e.g. with > bd_fsfreeze_count == 0, right? Yes. I had tried to drop the return value as all the freeze_bdev calls ignored it. But I had missed the unpaired emergency thaw and put it back and messed this up.. -- dm-devel mailing list dm-devel@redhat.com https://www.redhat.com/mailman/listinfo/dm-devel