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=-7.0 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS autolearn=ham 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 433A8C433DF for ; Fri, 26 Jun 2020 07:17:09 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 11FED2082E for ; Fri, 26 Jun 2020 07:17:09 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=wdc.com header.i=@wdc.com header.b="BrZ8zGIN"; dkim=pass (1024-bit key) header.d=sharedspace.onmicrosoft.com header.i=@sharedspace.onmicrosoft.com header.b="MRoFJuDt" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728145AbgFZHRI (ORCPT ); Fri, 26 Jun 2020 03:17:08 -0400 Received: from esa6.hgst.iphmx.com ([216.71.154.45]:14278 "EHLO esa6.hgst.iphmx.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726311AbgFZHRH (ORCPT ); Fri, 26 Jun 2020 03:17:07 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=wdc.com; i=@wdc.com; q=dns/txt; s=dkim.wdc.com; t=1593155827; x=1624691827; h=from:to:cc:subject:date:message-id:references: content-transfer-encoding:mime-version; bh=WtUCQLdCc0YoYIjCwpZBvx9WVU5egPmEdYqrZwLqeR4=; b=BrZ8zGINDq1659KFSOs7MlrUdRrigAYp3YrvA1V8/nRnK4bC5jB1dk6F gIRwgQdxA0REZY6fniWozykhCBn5K3lsiE0U7TRR2YQ1LRbPIIOoZdxPp 9pYgSamUDI4L2W219i1MJ0RT3XShVrBJjEjciVEutZcnxvW9iul8rsYGD MZZMA7H1ebLO8DSgbSxVvoPW3D6FYZMfDoPrgWvs5g1e2oPqN19JAcx1y R3YN7psCMQjv4cjBwd39UYCr+8P2oNNhKhIftANrRzXsfWA7C+uX4/uT8 4NisGgwvTpSU6tIVnOeRMfWy7va6+sVVeBxPgy6o3VkutuojicR0ZGWnl Q==; IronPort-SDR: YiWkyi/QHKBu54JWpccxdip3Vv5Ys7yPh38gcYSNLBtmSLhTp8D/Ai1+VKMY3kizFcvRFLwVIk FR47XtsoRs1vjaXHOe459DNphx++h6qoCcp2YhUXbK8ziiD9ucKEeS/oPFwPGjgapvGXs2Xi1Y 3TrhA5GPwKVBh+mCNQcB/PkYiQn3r/+hn5iNUauGqvjw+bQSFB71dhsQz9PMkeq+DgrepvyzSs znaLUhukRQlURJ+O3Dasp6itOu97T0n2M4zrdrO2iJ+zogSSJX30mK6QJl+EkgluSdjXNIjc1P hQg= X-IronPort-AV: E=Sophos;i="5.75,282,1589212800"; d="scan'208";a="142347555" Received: from mail-bl2nam02lp2058.outbound.protection.outlook.com (HELO NAM02-BL2-obe.outbound.protection.outlook.com) ([104.47.38.58]) by ob1.hgst.iphmx.com with ESMTP; 26 Jun 2020 15:17:06 +0800 ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=R3rrzA/YKPLqXeOAB1mshVV+fKoJ46GN9C3lbYssG02OQ1iDU4CMjX02PVBshnIDOAvLrB4JwTQ5ueQt9sv4CwivJGRbs/TV0IEJgN3HGlVd8uUx/a6RRayHhgwqj+2BB7JKgYE9W1tLNAbrEvTu0bNk4GC5SM9T3kY97a9PyDlqalD98+PjgZ2rcjlLL+7N8cF2S7t6rI7vy9hEDJqgkOaxqUG/QNd8g6RAjMFoEFO7nXYhzKcUVawgZz+zZXqGxaRWztzhTrDB93PSBxoiHIFMKeorOV6RCk1rUnmct1ksKh8AVuuecCTpiZrvyXflo7ybenfgbGXCLBgTwoAHRw== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=4C/ozukjZSsbfWeL8ovQYYN+y9TLTI+66BbEFhOzM9Q=; b=TYtzMHpQcBvsuiD0wykbgYACZgqFGnO8/kFJNX2QdBJu0itkhQsJfwK2F/r4zpYfPx9PkdtlWxiK1fRG3DMfDXPOLz4OVxR8L2tl7SstE0n+fSHuBAodPx4a+2J4VfZ+bT0RJKzobc1zT5/hivOWhGX6qO4aC9tLu54sP/VBRyjs2eTvCilCN3E9fBHsAEa6AyPeuXTUdJ5d8kgKiubQVO/44vq0zK8c4VSJEha21Ta1gpezbFUbk1Bsis1NX90j/Y7mOTcbvHXVD8H4CiU8ZMNrja6urUp7deRGdLlBlK1FzPhkhIlnqRPdonVJWBI3UFgsaFf3rmsT7/DwUzRq5g== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=wdc.com; dmarc=pass action=none header.from=wdc.com; dkim=pass header.d=wdc.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sharedspace.onmicrosoft.com; s=selector2-sharedspace-onmicrosoft-com; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=4C/ozukjZSsbfWeL8ovQYYN+y9TLTI+66BbEFhOzM9Q=; b=MRoFJuDtPjU5r+XhiFmkLaFJ4h5nYe9EoGQP0hywYZ0EG9PnshaJYkhtUkBR0XRZGEW2VQEAjIyhEEx+1jkB5eiazA2FF+6mk3vVhZIV0LA3F4o8WiBQbbBZEgEDNq0pKki41s/t8VUyz9xGr7rtyOu5V0ex6wefQSN8QintJs8= Received: from CY4PR04MB3751.namprd04.prod.outlook.com (2603:10b6:903:ec::14) by CY4PR04MB1048.namprd04.prod.outlook.com (2603:10b6:910:54::26) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3131.20; Fri, 26 Jun 2020 07:17:02 +0000 Received: from CY4PR04MB3751.namprd04.prod.outlook.com ([fe80::c593:f271:eebe:ac7]) by CY4PR04MB3751.namprd04.prod.outlook.com ([fe80::c593:f271:eebe:ac7%9]) with mapi id 15.20.3131.024; Fri, 26 Jun 2020 07:17:02 +0000 From: Damien Le Moal To: =?iso-8859-1?Q?Javier_Gonz=E1lez?= CC: "linux-nvme@lists.infradead.org" , "linux-block@vger.kernel.org" , "hch@lst.de" , "kbusch@kernel.org" , "sagi@grimberg.me" , "axboe@kernel.dk" , SelvaKumar S , Kanchan Joshi , Nitesh Shetty Subject: Re: [PATCH 3/6] block: add support for zone offline transition Thread-Topic: [PATCH 3/6] block: add support for zone offline transition Thread-Index: AQHWSutT3xCQHGem9k+D54mKrpOEQg== Date: Fri, 26 Jun 2020 07:17:01 +0000 Message-ID: References: <20200625122152.17359-1-javier@javigon.com> <20200625122152.17359-4-javier@javigon.com> <20200626060858.uo56xe57l4tzepnc@mpHalley.localdomain> <20200626065822.6psy3tp6vqmjwppa@mpHalley.localdomain> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: javigon.com; dkim=none (message not signed) header.d=none;javigon.com; dmarc=none action=none header.from=wdc.com; x-originating-ip: [129.253.182.57] x-ms-publictraffictype: Email x-ms-office365-filtering-ht: Tenant x-ms-office365-filtering-correlation-id: 97a7c9f3-243e-4a2b-6607-08d819a0ec2e x-ms-traffictypediagnostic: CY4PR04MB1048: x-microsoft-antispam-prvs: wdcipoutbound: EOP-TRUE x-ms-oob-tlc-oobclassifiers: OLM:10000; x-forefront-prvs: 0446F0FCE1 x-ms-exchange-senderadcheck: 1 x-microsoft-antispam: BCL:0; x-microsoft-antispam-message-info: NF/c5i/MQ7AdOoKXlDP7M3KEY35FaNv3LogSz1b7bpbweZoIWi+GKhaQux85oX8AKgahFou7Yc5eTMAnG1NRB6Cft6gKqX2ZN2MhMkCayhIcwKfJLVKXJf3jRnr/IyHRGEePMyZReSjUdxliZL2iegfzT0mVKNeGvO48ApPFO+ngf9K7/brGNQEHll83NsuFIralmbcSmmuEyB80HBlxHd3ODyt+pjWosLWKJxQ04UDgC2LBS9avZa7GN4qlQXrl3eHPEXBTJB0m0T3GrhvQ2KLJD+rzN+rqHVv+wBUnN6/CgIewf1VIVAdolUV76WiF x-forefront-antispam-report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:CY4PR04MB3751.namprd04.prod.outlook.com;PTR:;CAT:NONE;SFTY:;SFS:(4636009)(136003)(39860400002)(366004)(396003)(346002)(376002)(5660300002)(66476007)(7416002)(8936002)(8676002)(66556008)(66946007)(64756008)(86362001)(7696005)(54906003)(66446008)(478600001)(52536014)(71200400001)(316002)(4326008)(76116006)(53546011)(91956017)(26005)(55016002)(33656002)(66574015)(83380400001)(186003)(2906002)(9686003)(6506007)(6916009);DIR:OUT;SFP:1102; x-ms-exchange-antispam-messagedata: 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 x-ms-exchange-transport-forked: True Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: wdc.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: CY4PR04MB3751.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 97a7c9f3-243e-4a2b-6607-08d819a0ec2e X-MS-Exchange-CrossTenant-originalarrivaltime: 26 Jun 2020 07:17:01.9721 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: b61c8803-16f3-4c35-9b17-6f65f441df86 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: 12huu60bAxjQngYPueakvaK75TIaWGoeWLtveCa2qe1H5i9K14R9tcdfsgXNYKhf/vKQ9NZxV86efPqvVzDMAg== X-MS-Exchange-Transport-CrossTenantHeadersStamped: CY4PR04MB1048 Sender: linux-block-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org On 2020/06/26 15:58, Javier Gonz=E1lez wrote:=0A= > On 26.06.2020 06:42, Damien Le Moal wrote:=0A= >> On 2020/06/26 15:09, Javier Gonz=E1lez wrote:=0A= >>> On 26.06.2020 01:34, Damien Le Moal wrote:=0A= >>>> On 2020/06/25 21:22, Javier Gonz=E1lez wrote:=0A= >>>>> From: Javier Gonz=E1lez =0A= >>>>>=0A= >>>>> Add support for offline transition on the zoned block device using th= e=0A= >>>>> new zone management IOCTL=0A= >>>>>=0A= >>>>> Signed-off-by: Javier Gonz=E1lez =0A= >>>>> Signed-off-by: SelvaKumar S =0A= >>>>> Signed-off-by: Kanchan Joshi =0A= >>>>> Signed-off-by: Nitesh Shetty =0A= >>>>> ---=0A= >>>>> block/blk-core.c | 2 ++=0A= >>>>> block/blk-zoned.c | 3 +++=0A= >>>>> drivers/nvme/host/core.c | 3 +++=0A= >>>>> include/linux/blk_types.h | 3 +++=0A= >>>>> include/linux/blkdev.h | 1 -=0A= >>>>> include/uapi/linux/blkzoned.h | 1 +=0A= >>>>> 6 files changed, 12 insertions(+), 1 deletion(-)=0A= >>>>>=0A= >>>>> diff --git a/block/blk-core.c b/block/blk-core.c=0A= >>>>> index 03252af8c82c..589cbdacc5ec 100644=0A= >>>>> --- a/block/blk-core.c=0A= >>>>> +++ b/block/blk-core.c=0A= >>>>> @@ -140,6 +140,7 @@ static const char *const blk_op_name[] =3D {=0A= >>>>> REQ_OP_NAME(ZONE_CLOSE),=0A= >>>>> REQ_OP_NAME(ZONE_FINISH),=0A= >>>>> REQ_OP_NAME(ZONE_APPEND),=0A= >>>>> + REQ_OP_NAME(ZONE_OFFLINE),=0A= >>>>> REQ_OP_NAME(WRITE_SAME),=0A= >>>>> REQ_OP_NAME(WRITE_ZEROES),=0A= >>>>> REQ_OP_NAME(SCSI_IN),=0A= >>>>> @@ -1030,6 +1031,7 @@ generic_make_request_checks(struct bio *bio)=0A= >>>>> case REQ_OP_ZONE_OPEN:=0A= >>>>> case REQ_OP_ZONE_CLOSE:=0A= >>>>> case REQ_OP_ZONE_FINISH:=0A= >>>>> + case REQ_OP_ZONE_OFFLINE:=0A= >>>>> if (!blk_queue_is_zoned(q))=0A= >>>>> goto not_supported;=0A= >>>>> break;=0A= >>>>> diff --git a/block/blk-zoned.c b/block/blk-zoned.c=0A= >>>>> index 29194388a1bb..704fc15813d1 100644=0A= >>>>> --- a/block/blk-zoned.c=0A= >>>>> +++ b/block/blk-zoned.c=0A= >>>>> @@ -416,6 +416,9 @@ int blkdev_zone_mgmt_ioctl(struct block_device *b= dev, fmode_t mode,=0A= >>>>> case BLK_ZONE_MGMT_RESET:=0A= >>>>> op =3D REQ_OP_ZONE_RESET;=0A= >>>>> break;=0A= >>>>> + case BLK_ZONE_MGMT_OFFLINE:=0A= >>>>> + op =3D REQ_OP_ZONE_OFFLINE;=0A= >>>>> + break;=0A= >>>>> default:=0A= >>>>> return -ENOTTY;=0A= >>>>> }=0A= >>>>> diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c=0A= >>>>> index f1215523792b..5b95c81d2a2d 100644=0A= >>>>> --- a/drivers/nvme/host/core.c=0A= >>>>> +++ b/drivers/nvme/host/core.c=0A= >>>>> @@ -776,6 +776,9 @@ blk_status_t nvme_setup_cmd(struct nvme_ns *ns, s= truct request *req,=0A= >>>>> case REQ_OP_ZONE_FINISH:=0A= >>>>> ret =3D nvme_setup_zone_mgmt_send(ns, req, cmd, NVME_ZONE_FINISH);= =0A= >>>>> break;=0A= >>>>> + case REQ_OP_ZONE_OFFLINE:=0A= >>>>> + ret =3D nvme_setup_zone_mgmt_send(ns, req, cmd, NVME_ZONE_OFFLINE)= ;=0A= >>>>> + break;=0A= >>>>> case REQ_OP_WRITE_ZEROES:=0A= >>>>> ret =3D nvme_setup_write_zeroes(ns, req, cmd);=0A= >>>>> break;=0A= >>>>> diff --git a/include/linux/blk_types.h b/include/linux/blk_types.h=0A= >>>>> index 16b57fb2b99c..b3921263c3dd 100644=0A= >>>>> --- a/include/linux/blk_types.h=0A= >>>>> +++ b/include/linux/blk_types.h=0A= >>>>> @@ -316,6 +316,8 @@ enum req_opf {=0A= >>>>> REQ_OP_ZONE_FINISH =3D 12,=0A= >>>>> /* write data at the current zone write pointer */=0A= >>>>> REQ_OP_ZONE_APPEND =3D 13,=0A= >>>>> + /* Transition a zone to offline */=0A= >>>>> + REQ_OP_ZONE_OFFLINE =3D 14,=0A= >>>>>=0A= >>>>> /* SCSI passthrough using struct scsi_request */=0A= >>>>> REQ_OP_SCSI_IN =3D 32,=0A= >>>>> @@ -456,6 +458,7 @@ static inline bool op_is_zone_mgmt(enum req_opf o= p)=0A= >>>>> case REQ_OP_ZONE_OPEN:=0A= >>>>> case REQ_OP_ZONE_CLOSE:=0A= >>>>> case REQ_OP_ZONE_FINISH:=0A= >>>>> + case REQ_OP_ZONE_OFFLINE:=0A= >>>>> return true;=0A= >>>>> default:=0A= >>>>> return false;=0A= >>>>> diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h=0A= >>>>> index bd8521f94dc4..8308d8a3720b 100644=0A= >>>>> --- a/include/linux/blkdev.h=0A= >>>>> +++ b/include/linux/blkdev.h=0A= >>>>> @@ -372,7 +372,6 @@ extern int blkdev_zone_ops_ioctl(struct block_dev= ice *bdev, fmode_t mode,=0A= >>>>> unsigned int cmd, unsigned long arg);=0A= >>>>> extern int blkdev_zone_mgmt_ioctl(struct block_device *bdev, fmode_t= mode,=0A= >>>>> unsigned int cmd, unsigned long arg);=0A= >>>>> -=0A= >>>>> #else /* CONFIG_BLK_DEV_ZONED */=0A= >>>>>=0A= >>>>> static inline unsigned int blkdev_nr_zones(struct gendisk *disk)=0A= >>>>> diff --git a/include/uapi/linux/blkzoned.h b/include/uapi/linux/blkzo= ned.h=0A= >>>>> index a8c89fe58f97..d0978ee10fc7 100644=0A= >>>>> --- a/include/uapi/linux/blkzoned.h=0A= >>>>> +++ b/include/uapi/linux/blkzoned.h=0A= >>>>> @@ -155,6 +155,7 @@ enum blk_zone_action {=0A= >>>>> BLK_ZONE_MGMT_FINISH =3D 0x2,=0A= >>>>> BLK_ZONE_MGMT_OPEN =3D 0x3,=0A= >>>>> BLK_ZONE_MGMT_RESET =3D 0x4,=0A= >>>>> + BLK_ZONE_MGMT_OFFLINE =3D 0x5,=0A= >>>>> };=0A= >>>>>=0A= >>>>> /**=0A= >>>>>=0A= >>>>=0A= >>>> As mentioned in previous email, the usefulness of this is dubious. Ple= ase=0A= >>>> elaborate in the commit message. Sure NVMe ZNS defines this and we can= support=0A= >>>> it. But without a good use case, what is the point ?=0A= >>>=0A= >>> Use case is to transition zones in read-only state to offline when we= =0A= >>> are done moving valid data. It is easier to explicitly managing zones= =0A= >>> that are not usable by having all under the offline state.=0A= >>=0A= >> Then adding a simple BLKZONEOFFLINE ioctl, similar to open, close, finis= h and=0A= >> reset, would be enough. No need for all the new zone management ioctl wi= th flags=0A= >> plumbing.=0A= > =0A= > Ok. We can add that then.=0A= > =0A= > Note that zone management is not motivated by this use case at all, but= =0A= > it made sense to implement it here instead of as a new BLKZONEOFFLINE=0A= > IOCTL as ZAC/ZBC users will not be able to use it either way.=0A= =0A= Sure, that is fine. We could actually add that to sd_zbc.c since we have zo= ne=0A= tracking there. A read-only zone can be reported as offline to sync-up with= zns.=0A= The value of it is dubious though as most applications will treat read-only= and=0A= offline zones the same way: as unusable. That is what zonefs does.=0A= =0A= > =0A= >>=0A= >>>=0A= >>>>=0A= >>>> scsi SD driver will return BLK_STS_NOTSUPP if this offlining is sent t= o a=0A= >>>> ZBC/ZAC drive. Not nice. Having a sysfs attribute "max_offline_zone_se= ctors" or=0A= >>>> the like to indicate support by the device or not would be nicer.=0A= >>>=0A= >>> We can do that.=0A= >>>=0A= >>>>=0A= >>>> Does offling ALL zones make any sense ? Because this patch does not pr= event the=0A= >>>> use of the REQ_ZONE_ALL flags introduced in patch 2. Probably not a go= od idea to=0A= >>>> allow offlining all zones, no ?=0A= >>>=0A= >>> AFAIK the transition to offline is only valid when coming from a=0A= >>> read-only state. I did think of adding a check, but I can see that othe= r=0A= >>> transitions go directly to the driver and then the device, so I decided= =0A= >>> to follow the same model. If you think it is better, we can add the=0A= >>> check.=0A= >>=0A= >> My point was that the REQ_ZONE_ALL flag would make no sense for offlinin= g zones=0A= >> but this patch does not have anything checking that. There is no point i= n=0A= >> sending a command that is known to be incorrect to the drive...=0A= > =0A= > I will add some extra checks then to fail early. I assume these should=0A= > be in the NVMe driver as it is NVMe-specific, right?=0A= =0A= If it is a simple BLKZONEOFFLINE ioctl, it can be processed exactly like op= en,=0A= close and finish, using blkdev_zone_mgmt(). Calling that one for a range of= =0A= sectors of more than one zone will likely not make any sense most of the ti= me,=0A= but that is allowed for all other ops, so I guess you can keep it as is for= =0A= offline too. blkdev_zone_mgmt() will actually not need any change. You will= only=0A= need to wire the ioctl path and update op_is_zone_mgmt(). That's it. Simple= that=0A= way.=0A= =0A= > =0A= > Javier=0A= > =0A= =0A= =0A= -- =0A= Damien Le Moal=0A= Western Digital Research=0A=