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=-0.9 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,UNPARSEABLE_RELAY autolearn=no 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 25235C43331 for ; Thu, 2 Apr 2020 02:32:36 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id EA8C320721 for ; Thu, 2 Apr 2020 02:32:35 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=oracle.com header.i=@oracle.com header.b="qvibkPg0" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732498AbgDBCcf (ORCPT ); Wed, 1 Apr 2020 22:32:35 -0400 Received: from userp2120.oracle.com ([156.151.31.85]:49856 "EHLO userp2120.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727135AbgDBCcf (ORCPT ); Wed, 1 Apr 2020 22:32:35 -0400 Received: from pps.filterd (userp2120.oracle.com [127.0.0.1]) by userp2120.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 0322Sk1B106362; Thu, 2 Apr 2020 02:32:02 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=to : cc : subject : from : references : date : in-reply-to : message-id : mime-version : content-type; s=corp-2020-01-29; bh=C1sTv2mfdV+vS0lPpUAa1c5xsmzknrneWhl3ZOZXPZc=; b=qvibkPg0lqK/4Wblb53/3Nf4F5BPZl1OPZt56Qcw74Xd2QeSEZWCHBP1KTAxX8meRDtq 1vLjNTHdTdYORG69ou7m+izgGSK8yOmFsuQPmUrGBh6I9qZReSGVk7LMoVQeLG4hSkw/ /7gYvaCL1aSfARnob4BgySy11mvBPfNa0x5h4X+vLtd6kjge03+w1VyoTpNH2bDGDXXl lHHAGq/v7stHC/C1PCASocPmkdfLyCOM/KhE49K2+cq8kcZ/025xZ8zaV6HHFH3gU0Zh oFopk5+VtwC1SPzm6xzJI5vuBotK8604l4Us5W9GnDHgHdCqCcnB8F7DLBV3JkNfyP77 xw== Received: from userp3020.oracle.com (userp3020.oracle.com [156.151.31.79]) by userp2120.oracle.com with ESMTP id 303aqhs7fr-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 02 Apr 2020 02:32:02 +0000 Received: from pps.filterd (userp3020.oracle.com [127.0.0.1]) by userp3020.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 0322S7Ix010425; Thu, 2 Apr 2020 02:30:01 GMT Received: from aserv0122.oracle.com (aserv0122.oracle.com [141.146.126.236]) by userp3020.oracle.com with ESMTP id 302ga1j3ad-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 02 Apr 2020 02:30:01 +0000 Received: from abhmp0010.oracle.com (abhmp0010.oracle.com [141.146.116.16]) by aserv0122.oracle.com (8.14.4/8.14.4) with ESMTP id 0322TheE011819; Thu, 2 Apr 2020 02:29:43 GMT Received: from ca-mkp.ca.oracle.com (/10.159.214.123) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Wed, 01 Apr 2020 19:29:42 -0700 To: Konstantin Khlebnikov Cc: Chaitanya Kulkarni , hch@lst.de, martin.petersen@oracle.com, darrick.wong@oracle.com, axboe@kernel.dk, tytso@mit.edu, adilger.kernel@dilger.ca, ming.lei@redhat.com, jthumshirn@suse.de, minwoo.im.dev@gmail.com, damien.lemoal@wdc.com, andrea.parri@amarulasolutions.com, hare@suse.com, tj@kernel.org, hannes@cmpxchg.org, ajay.joshi@wdc.com, bvanassche@acm.org, arnd@arndb.de, houtao1@huawei.com, asml.silence@gmail.com, linux-block@vger.kernel.org, linux-ext4@vger.kernel.org Subject: Re: [PATCH 0/4] block: Add support for REQ_OP_ASSIGN_RANGE From: "Martin K. Petersen" Organization: Oracle Corporation References: <20200329174714.32416-1-chaitanya.kulkarni@wdc.com> Date: Wed, 01 Apr 2020 22:29:38 -0400 In-Reply-To: (Konstantin Khlebnikov's message of "Wed, 1 Apr 2020 09:22:26 +0300") Message-ID: User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/26.1.92 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9578 signatures=668685 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=18 malwarescore=0 mlxlogscore=999 bulkscore=0 mlxscore=0 spamscore=0 adultscore=0 phishscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2003020000 definitions=main-2004020020 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9578 signatures=668685 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 bulkscore=0 phishscore=0 clxscore=1015 malwarescore=0 impostorscore=0 mlxlogscore=999 spamscore=0 mlxscore=0 priorityscore=1501 lowpriorityscore=0 adultscore=0 suspectscore=18 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2003020000 definitions=main-2004020020 Sender: linux-block-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org Konstantin, >> The corresponding exported primitive is called >> blkdev_issue_assign_range(). > > What exact semantics of that? REQ_OP_ALLOCATE will be used to compel a device to allocate a block range. What a given block contains after successful allocation is undefined (depends on the device implementation). For block allocation with deterministic zeroing, one must keep using REQ_OP_WRITE_ZEROES with the NOUNMAP flag set. -- Martin K. Petersen Oracle Linux Engineering