From patchwork Tue Jun 30 12:35:28 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: =?utf-8?q?Michal_Such=C3=A1nek?= X-Patchwork-Id: 11633893 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 35163618 for ; Tue, 30 Jun 2020 12:35:42 +0000 (UTC) Received: from ml01.01.org (ml01.01.org [198.145.21.10]) (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 126B020774 for ; Tue, 30 Jun 2020 12:35:42 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 126B020774 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=suse.de Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-nvdimm-bounces@lists.01.org Received: from ml01.vlan13.01.org (localhost [IPv6:::1]) by ml01.01.org (Postfix) with ESMTP id C3D151141F7A9; Tue, 30 Jun 2020 05:35:41 -0700 (PDT) Received-SPF: Pass (mailfrom) identity=mailfrom; client-ip=195.135.220.15; helo=mx2.suse.de; envelope-from=msuchanek@suse.de; receiver= Received: from mx2.suse.de (mx2.suse.de [195.135.220.15]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ml01.01.org (Postfix) with ESMTPS id 0370610FCDC90 for ; Tue, 30 Jun 2020 05:35:38 -0700 (PDT) X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id 7A421AF24; Tue, 30 Jun 2020 12:35:37 +0000 (UTC) From: Michal Suchanek To: linux-nvdimm@lists.01.org Subject: [PATCH] dm writecache: reject asynchronous pmem. Date: Tue, 30 Jun 2020 14:35:28 +0200 Message-Id: <20200630123528.29660-1-msuchanek@suse.de> X-Mailer: git-send-email 2.26.2 MIME-Version: 1.0 Message-ID-Hash: QABSYQJJOGFNZZIO5J4BYGMSMPZSICUH X-Message-ID-Hash: QABSYQJJOGFNZZIO5J4BYGMSMPZSICUH X-MailFrom: msuchanek@suse.de X-Mailman-Rule-Hits: nonmember-moderation X-Mailman-Rule-Misses: dmarc-mitigation; no-senders; approved; emergency; loop; banned-address; member-moderation CC: Michal Suchanek , Mikulas Patocka , "Aneesh Kumar K.V" , Jan Kara , Alasdair Kergon , Mike Snitzer , dm-devel@redhat.com, "Michael S. Tsirkin" , Yuval Shaia , Cornelia Huck , Jakub Staron , linux-kernel@vger.kernel.org X-Mailman-Version: 3.1.1 Precedence: list List-Id: "Linux-nvdimm developer list." Archived-At: List-Archive: List-Help: List-Post: List-Subscribe: List-Unsubscribe: The writecache driver does not handle asynchronous pmem. Reject it when supplied as cache. Link: https://lore.kernel.org/linux-nvdimm/87lfk5hahc.fsf@linux.ibm.com/ Fixes: 6e84200c0a29 ("virtio-pmem: Add virtio pmem driver") Signed-off-by: Michal Suchanek --- drivers/md/dm-writecache.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/md/dm-writecache.c b/drivers/md/dm-writecache.c index 30505d70f423..57b0a972f6fd 100644 --- a/drivers/md/dm-writecache.c +++ b/drivers/md/dm-writecache.c @@ -2277,6 +2277,12 @@ static int writecache_ctr(struct dm_target *ti, unsigned argc, char **argv) wc->memory_map_size -= (uint64_t)wc->start_sector << SECTOR_SHIFT; + if (!dax_synchronous(wc->ssd_dev->dax_dev)) { + r = -EOPNOTSUPP; + ti->error = "Asynchronous persistent memory not supported as pmem cache"; + goto bad; + } + bio_list_init(&wc->flush_list); wc->flush_thread = kthread_create(writecache_flush_thread, wc, "dm_writecache_flush"); if (IS_ERR(wc->flush_thread)) {