From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mx0b-00069f02.pphosted.com (mx0b-00069f02.pphosted.com [205.220.177.32]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 6D6422C99 for ; Thu, 4 Nov 2021 20:27:36 +0000 (UTC) Received: from pps.filterd (m0246630.ppops.net [127.0.0.1]) by mx0b-00069f02.pphosted.com (8.16.1.2/8.16.1.2) with SMTP id 1A4KOSH2009207; Thu, 4 Nov 2021 20:27:26 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=from : to : cc : subject : date : message-id : references : in-reply-to : content-type : content-id : content-transfer-encoding : mime-version; s=corp-2021-07-09; bh=F9P2aGL1/lOzWsR+TIchg/2/ILE0oFWwHKyMF8MxaoU=; b=NPiAS0SFUD44iiPgoYOEvSE0jGEUkkWTbcxMXIZoAOo0cIQAL+jQYlSYqGFt+nLj6dUT V30asPbDfnmNrgBRdeWBPYG+IB3+xLwLJ8NlTxcbBGdVFAhpe4gkDZy6ENfgKvb70Cwq /+DztWu7dy2k4hGShxXysn+3bTdFFaz9W3+8gT3NXvzOzzAupkACTGoSMQex+RTPh11P ZwgyeNLn+bwxYN/RxtX90Tpi4Zf4I0AGK/VbC2KDDo0V+AOE1hf+/BJ1y/4DmCGvhCIj XsGhDw575dQ86AZOnSun+HoIIP62IyxHTMQtG6AeWsvKAb90W4Lv45/wignPZE4oJWKS LQ== Received: from aserp3020.oracle.com (aserp3020.oracle.com [141.146.126.70]) by mx0b-00069f02.pphosted.com with ESMTP id 3c3n8pa9ss-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 04 Nov 2021 20:27:26 +0000 Received: from pps.filterd (aserp3020.oracle.com [127.0.0.1]) by aserp3020.oracle.com (8.16.1.2/8.16.1.2) with SMTP id 1A4KCIRS145552; Thu, 4 Nov 2021 20:27:25 GMT Received: from nam10-bn7-obe.outbound.protection.outlook.com (mail-bn7nam10lp2108.outbound.protection.outlook.com [104.47.70.108]) by aserp3020.oracle.com with ESMTP id 3c0wv8b90u-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 04 Nov 2021 20:27:24 +0000 ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=fYyQHPXYPfx5+UBxEWWk4axenrdlxKDlPsa4lnIToaeiJ8OuNPZfs6R2I2pxUUUoFjX21Qh7LBUC5a2t+T48KgNRQwVbKtcHMQf06NjIYT9KcZg8ndqsIfqi7cysTpZLKY3d7E3XCH3DPX+AJAZ174ZrBMsJIkgQujh7/aSeKxKxNVpFTnn6Hi5s6EMWJmqJ9icyuHzNWgjEzamHxLeXCMDV/SU3eaZErhVo7uqtHCiyjRF71wtBlnR4H0AwgJMYL5fAQPDdutB+ZLmj9ydHiDiMUMGMNThsijsPZcxvsxfiXiv6m0rHYJmitdUlpj9DWMwl6ltoKTWJFfspPah6dA== 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-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; bh=F9P2aGL1/lOzWsR+TIchg/2/ILE0oFWwHKyMF8MxaoU=; b=dtNd+UwxNYFCijP8ryBihGu3h3Or6OPWFYyI1A1TJ8l+kSazR/xGOvfFQp3Ky9xAQ7DqP+UXwjADjefJ5/Jd/L1HISnZMKgz2U9MGppVc2w5jgpbpHAUWwWHO1pwncTQPvb6DGT8mh0ecg6dJaS/42hK7un0KXGTr9N1n6c4Dm7qKh6fKRA//RkAofCq0XkSMbRcg7J2rp8/dAVfAnqqOvv2TZrclaW27gkddSVmiBDUuIQCeANVLI4yLUW0SwxywGSdgzOcggQJFLjDpq2G/if/M4vB4ta0xL2y/hnqP/3mYkexCUqurVCY8EM2pQFuQfbFk7W9fYiHacviI5XIGg== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=oracle.com; dmarc=pass action=none header.from=oracle.com; dkim=pass header.d=oracle.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.onmicrosoft.com; s=selector2-oracle-onmicrosoft-com; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=F9P2aGL1/lOzWsR+TIchg/2/ILE0oFWwHKyMF8MxaoU=; b=kkzGWNKWGAJl/Gr8URGYBuksOPXwZUGb23oeOvRt4JNY9elxUtdeBKZJ9sk+RhwC/D0X/NZchEYQukldx6BCvyTHlCM11rwZlNA2muEVhBDhrzv6NH8wUYMeWIIQiWyMjmvHK5HPrU2APUnTzgwv6CTKAaOvVGG5EtzOkXq6AuM= Received: from SJ0PR10MB4429.namprd10.prod.outlook.com (2603:10b6:a03:2d1::14) by BYAPR10MB3512.namprd10.prod.outlook.com (2603:10b6:a03:11b::22) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4669.13; Thu, 4 Nov 2021 20:27:21 +0000 Received: from SJ0PR10MB4429.namprd10.prod.outlook.com ([fe80::418c:dfe4:f3ee:feaa]) by SJ0PR10MB4429.namprd10.prod.outlook.com ([fe80::418c:dfe4:f3ee:feaa%6]) with mapi id 15.20.4669.011; Thu, 4 Nov 2021 20:27:21 +0000 From: Jane Chu To: Dan Williams CC: Christoph Hellwig , "Darrick J. Wong" , "david@fromorbit.com" , "vishal.l.verma@intel.com" , "dave.jiang@intel.com" , "agk@redhat.com" , "snitzer@redhat.com" , "dm-devel@redhat.com" , "ira.weiny@intel.com" , "willy@infradead.org" , "vgoyal@redhat.com" , "linux-fsdevel@vger.kernel.org" , "nvdimm@lists.linux.dev" , "linux-kernel@vger.kernel.org" , "linux-xfs@vger.kernel.org" Subject: Re: [dm-devel] [PATCH 0/6] dax poison recovery with RWF_RECOVERY_DATA flag Thread-Topic: [dm-devel] [PATCH 0/6] dax poison recovery with RWF_RECOVERY_DATA flag Thread-Index: AQHXxhAze/H2dZp4I0O0xNcfyRn+pqvdUicAgADsdoCAAELPAIABAAaAgAbwJYCAASa6gIAIPpYAgADknQCAAWBnAIAAPDYAgADIRwCAAIRIgIAAJDSAgAAHXwCAABhYAA== Date: Thu, 4 Nov 2021 20:27:21 +0000 Message-ID: <342eb71c-0aff-77e5-3c71-92224d7d48e0@oracle.com> References: <2102a2e6-c543-2557-28a2-8b0bdc470855@oracle.com> <20211028002451.GB2237511@magnolia> <6d21ece1-0201-54f2-ec5a-ae2f873d46a3@oracle.com> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: user-agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:91.0) Gecko/20100101 Thunderbird/91.2.1 authentication-results: intel.com; dkim=none (message not signed) header.d=none;intel.com; dmarc=none action=none header.from=oracle.com; x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: d5f7557e-19b7-4953-f50f-08d99fd18116 x-ms-traffictypediagnostic: BYAPR10MB3512: x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:10000; x-ms-exchange-senderadcheck: 1 x-ms-exchange-antispam-relay: 0 x-microsoft-antispam: BCL:0; x-microsoft-antispam-message-info: a1qLVq5OJkFYKdC39HNSImIYwfGOZ49LdZw9dOjhjIoLF9Lxg2MPJq3xhBEJQ7YyN/9UO7rCT+Y2U+TUpneyYna3BO6ohsbTkAvu5SJYmNyxzftBKV29PD5FHHhLrVY+LrkoaxRM0TkMfSE6diXm1n7wL9HtwWRO0npmQamDMJw/32M+y4vuVLRfiaC5mqvURkxNL6qe1Lg21jwmAxHfyMUV6sn45Acs51ga4E6/kQ/UoM2qsW1QIopnwKC1krEd2EL8pX880YkVhxGF+w59a5/RC25KmdtJxH8YSLfujmzVNV8Nn6fnhRnIOZh3qr1PsPYcqKxV0tEjYoVcIKtuceSIvQ+4Qf5ETz0BHHwGGHlT70mor1X9g8ECOUBS7Exo6aXQyKYP602wOKEqwiv1tu0uuolyIT/+lvtREV2l+NGw+ODt1FD8NYpJ5mNZHw+ecgIOXsG3d326nNaINqkJYIZ/h6JPiF9he6UA1gGV7ehf0a9ajo/fKuUS3KfovSA0f6lSwIKzA75plR/G2XArUgJ0zrzjr9uBb8/ouAJ5afcwJVoRxRt7uHp8oNH5tshsk3Ncm8wfZKfObKXh846s64np87wDWb96ReposglMR9g6yq6lP/nuFe0I0N5MLkV9UNVRUTtYbeU+dWZxMGeuWfbw3KyM9scE2XADsAzQh2gInZ3kqlUgKfUgBXF+xQjeOPqhV9XeyHUPCQxirCsjhTZu/9hSOv/LcXQnToRXbkDjkB62w8VFmPE81b/EJUQo1HESM0P43u6HAXsHwQrbZOf8bmLCHfQO8jtk0uCUZH0MVS1bGA/44IEvmyPpvZKV4Lxq+rwlrx/xMkc+KWxMGv90Tc1r+EXTVRRmLR0R8co= x-forefront-antispam-report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:SJ0PR10MB4429.namprd10.prod.outlook.com;PTR:;CAT:NONE;SFS:(366004)(53546011)(91956017)(76116006)(66556008)(66946007)(6506007)(66476007)(186003)(316002)(2616005)(83380400001)(5660300002)(2906002)(31686004)(64756008)(66446008)(31696002)(7416002)(8936002)(6512007)(54906003)(71200400001)(26005)(44832011)(86362001)(4326008)(966005)(38070700005)(6916009)(8676002)(36756003)(6486002)(122000001)(508600001)(38100700002)(45980500001)(43740500002);DIR:OUT;SFP:1101; x-ms-exchange-antispam-messagedata-chunkcount: 1 x-ms-exchange-antispam-messagedata-0: =?utf-8?B?WTNSUE16MjgvUUlHMHg4L0JLbjRYZFBTaEJ0cW11ck9pVDVtYnlhWGd5Y1Rx?= =?utf-8?B?THpzY2tRSDlnZUorS2VHeDJ4YWtGaFNwamJKMnB4aHJ0eTllc2NjcElNK1BJ?= =?utf-8?B?TlhsRFJNdWFEbm8yc2VKVHZEM2VHbkwvNmdSSlo2MGJkRm0vMGVPOWVZWGpn?= =?utf-8?B?MDVDRm04NUxXcmg4S1BZZmhlVkRJcWlJWStNWERtRkR5MlFxL2V3UDBHNUVB?= =?utf-8?B?UEtUS1ovUkxsVTNGQkhCUlc0aTZQNlFTUlFwK2Q5T0huSUtxNUxxYTJtdnd0?= =?utf-8?B?RzVCRmxzd1BGcE1tNVlIaFNEekFYaDBTcTRHaFN5L00xbTZkWUVsSzdtMUtG?= =?utf-8?B?RFRLbVZsMDhaMTlSMVQ2QXhJcUlqUmlreFd0Q0QzNEhVb0ZGL3FoNStvQ215?= =?utf-8?B?bTJDbjJoK1FYUHJWRHFWRTlJSVhaNGIvNDVqK2FnQWpiUkwxZnNPbFFkNHN0?= =?utf-8?B?MjhicVFZd0NlWTJhZFVQcHdEOGlCVFVST29uNThvb1NWQlE5aGNiczV1aVky?= =?utf-8?B?b2cwRUJHOGRpTzNyMHdVNUxYQ3dETHZCb2xJTGg2Y2FaK25WKzI0MWhpVFRj?= =?utf-8?B?eVRPdWR5RlpqcUhmOElWSnAycStaczA2Sk44bGxpUDhWN0Mwa3kvUEJsaGE4?= =?utf-8?B?MTJvckswdHZYYU4wRFBHbVZwNE0xQW5DSXFZeGp1WUVzVlB5SlNIUTNFeDVy?= =?utf-8?B?aWk5ZmVkUFNwc21qelNuR3ROeFBnYkpuOStvVGcrODM3M2VSVDFGZlFTSkRm?= =?utf-8?B?WWFqY0g5bTlma0xlZVZscUI2TERGMEZremJDenFsd0JmZjJJNmtYb3RvRkNN?= =?utf-8?B?bTNpQlh1VjNMc0Y4cE1ZM1dCYkZTcWZ0NUFoVFJ6YUhNMnQ5QnR5VjBxRnB6?= =?utf-8?B?cW9HcjVTMzVyTWJIdEZnY2I0ZS9mYUpScy93NzZKLy9ITkRLb0VlY1poN3ZT?= =?utf-8?B?VTZRSGRtOGMzeUFoeURnN1JFSWg3QkxaaHR0d2dWSlExOXpIQ1l0RXJUWGlW?= =?utf-8?B?N3V3V3Z6OVpDMDVOTWpqY0ZoWnpqRnh6MVlWMnV0NzczK0w1aU1IWnQzckov?= =?utf-8?B?WTF3bXpibVd6bFdnQWhaRGs1aldlM3FmRHdkK1ZaTFQ0ZmE3TGFXMExCQUFK?= =?utf-8?B?Smc4bU5wNmhnalphNGIzUmtiV09qRHZ3SmY1YmpvVExuZ1BXa05xS3pqTzNl?= =?utf-8?B?M2tLSDZsSXhJeG9MamNqM1JhSEpnanYyZjA4c1pMeTRnNkNlUVNuUWJERHBm?= =?utf-8?B?RWxaNEpvaVVqU2cvaVhDUElSVkl0KzkwS3lLdm1kU25ZOXpiOE0wakpjVCti?= =?utf-8?B?UVpJc01sSmJWMHVzZ0NYWXJoYnVXZFoxNXlzcUZwY21SblplTDBTWkN5OTVQ?= =?utf-8?B?RGZIYXdUbUVzUWlrdlFFY2t2NkkxQUJnNmxjSVU3N0JNZjhYdWFKT0xERWdi?= =?utf-8?B?RW1LREFtZkdyNC83T0d5aHFBTlNrTEZ6SzhBNU5Fb1hHMmo0MXF5eC81VVRY?= =?utf-8?B?RGF2UTVKK1ArSnZYMnFGZmgzTG1oa0dWbU1hSzBNc3I0RDRUTTZIeERDNzBr?= =?utf-8?B?d3pSNTV1eTBQak5uMnVCQlhYNDM0amhTWDU0OVZRVTdMR3hJaTMvejZSdUxY?= =?utf-8?B?aFhRUU1rS2Z4VXZ0aGwvN21uUTZ1dFI3RXZLdm9qb2dUcXc3RnFQRHg0dmNj?= =?utf-8?B?NnZIRDJVY1pCeU9aK3RFaXJzT0VXKys5VlNDMmhHRDQzb0NBYXM5clhIVU1D?= =?utf-8?B?TWlaS2w4ckdoUnlSM3NZeTZwc2RwTWp3ZGdxVFhHcmErek1oUVdKNDRkQmFa?= =?utf-8?B?VkhtbGY3WDQ5TEt5WTErV282ZFhTOXVTcUFYRGVOMnIwYzlYMXM1OFh0SzYv?= =?utf-8?B?cWg5L29tdkhYdlJReVRPN1o5VEszM2REVE5ib3dqS1FXamZwT29jR044OE5D?= =?utf-8?B?WDgwdmJqWVRYcUJrREtTVG1aSnNtLzFrVlM3bjZvRVVRN2pHTEdaRmFOTGtw?= =?utf-8?B?RkNpa3RCckhTdjhwanpKbzkxVjJLVGdObURJL252V0k0T0ZkTWFUK1J3eVZG?= =?utf-8?B?VDJVQm10OTdLNzU2K2k3ZFJkYkNMYkhMVUhlek1HajZHUDl5MzJDSUhrSzlw?= =?utf-8?B?cUxEVkVvMDRLOG5DUXY0YjdOTjVRT2pYcElxdXhDQ3Rud204WkNacmZ0eGw5?= =?utf-8?B?bmc9PQ==?= Content-Type: text/plain; charset="utf-8" Content-ID: <01DCC2ACCEEBC54EBF7311E72E96B3BD@namprd10.prod.outlook.com> Content-Transfer-Encoding: base64 Precedence: bulk X-Mailing-List: nvdimm@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-OriginatorOrg: oracle.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: SJ0PR10MB4429.namprd10.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: d5f7557e-19b7-4953-f50f-08d99fd18116 X-MS-Exchange-CrossTenant-originalarrivaltime: 04 Nov 2021 20:27:21.1307 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 4e2c6054-71cb-48f1-bd6c-3a9705aca71b X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: qwTZ8tAJo9JoIQXbJsnre4zoiwrl2GNkI63NifPwmqew6+15Gndyr3A/HhATlxfXqSHlDfGgX3F04LTr7IyIkA== X-MS-Exchange-Transport-CrossTenantHeadersStamped: BYAPR10MB3512 X-Proofpoint-Virus-Version: vendor=nai engine=6300 definitions=10158 signatures=668683 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 bulkscore=0 phishscore=0 malwarescore=0 mlxscore=0 suspectscore=0 mlxlogscore=999 adultscore=0 spamscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2110150000 definitions=main-2111040079 X-Proofpoint-ORIG-GUID: -RF93fyzrJTKJjpOAWzZi2b8YO7cagdY X-Proofpoint-GUID: -RF93fyzrJTKJjpOAWzZi2b8YO7cagdY T24gMTEvNC8yMDIxIDEyOjAwIFBNLCBEYW4gV2lsbGlhbXMgd3JvdGU6DQoNCj4+DQo+PiBJZiB0 aGlzIHVuZGVyc3RhbmRpbmcgaXMgaW4gdGhlIHJpZ2h0IGRpcmVjdGlvbiwgdGhlbiBJJ2QgbGlr ZSB0bw0KPj4gcHJvcG9zZSBiZWxvdyBjaGFuZ2VzIHRvDQo+PiAgICAgZGF4X2RpcmVjdF9hY2Nl c3MoKSwgZGF4X2NvcHlfdG8vZnJvbV9pdGVyKCksIHBtZW1fY29weV90by9mcm9tX2l0ZXIoKQ0K Pj4gICAgIGFuZCB0aGUgZG0gbGF5ZXIgY29weV90by9mcm9tX2l0ZXIsIGRheF9pb21hcF9pdGVy KCkuDQo+Pg0KPj4gMS4gZGF4X2lvbWFwX2l0ZXIoKSByZWx5IG9uIGRheF9kaXJlY3RfYWNjZXNz KCkgdG8gZGVjaWRlIHdoZXRoZXIgdGhlcmUNCj4+ICAgICAgaXMgbGlrZWx5IG1lZGlhIGVycm9y OiBpZiB0aGUgQVBJIHdpdGhvdXQgREFYX0ZfUkVDT1ZFUlkgcmV0dXJucw0KPj4gICAgICAtRUlP LCB0aGVuIHN3aXRjaCB0byByZWNvdmVyeS1yZWFkL3dyaXRlIGNvZGUuICBJbiByZWNvdmVyeSBj b2RlLA0KPj4gICAgICBzdXBwbHkgREFYX0ZfUkVDT1ZFUlkgdG8gZGF4X2RpcmVjdF9hY2Nlc3Mo KSBpbiBvcmRlciB0byBvYnRhaW4NCj4+ICAgICAgJ2thZGRyJywgYW5kIHRoZW4gY2FsbCBkYXhf Y29weV90by9mcm9tX2l0ZXIoKSB3aXRoIERBWF9GX1JFQ09WRVJZLg0KPiANCj4gSSBsaWtlIGl0 LiBJdCBhbGxvd3MgZm9yIGFuIGF0b21pYyB3cml0ZStjbGVhciBpbXBsZW1lbnRhdGlvbiBvbg0K PiBjYXBhYmxlIHBsYXRmb3JtcyBhbmQgY29vcmRpbmF0ZXMgd2l0aCBwb3RlbnRpYWxseSB1bm1h cHBlZCBwYWdlcy4gVGhlDQo+IGJlc3Qgb2YgYm90aCB3b3JsZHMgZnJvbSB0aGUgZGF4X2NsZWFy X3BvaXNvbigpIHByb3Bvc2FsIGFuZCBteSAidGFrZQ0KPiBhIGZhdWx0IGFuZCBkbyBhIHNsb3ct cGF0aCBjb3B5Ii4NCj4gDQo+PiAyLiB0aGUgX2NvcHlfdG8vZnJvbV9pdGVyIGltcGxlbWVudGF0 aW9uIHdvdWxkIGJlIGxhcmdlbHkgdGhlIHNhbWUNCj4+ICAgICAgYXMgaW4gbXkgcmVjZW50IHBh dGNoLCBidXQgc29tZSBjaGFuZ2VzIGluIENocmlzdG9waCdzDQo+PiAgICAgICdkYXgtZGV2aXJ0 dWFsaXplJyBtYXliZSBrZXB0LCBzdWNoIGFzIERBWF9GX1ZJUlRVQUwsIG9idmlvdXNseQ0KPj4g ICAgICB2aXJ0dWFsIGRldmljZXMgZG9uJ3QgaGF2ZSB0aGUgYWJpbGl0eSB0byBjbGVhciBwb2lz b24sIHNvIG5vIG5lZWQNCj4+ICAgICAgdG8gY29tcGxpY2F0ZSB0aGVtLiAgQW5kIHRoaXMgYWxz byBtZWFucyB0aGF0IG5vdCBldmVyeSBlbmRwb2ludA0KPj4gICAgICBkYXggZGV2aWNlIGhhcyB0 byBwcm92aWRlIGRheF9vcC5jb3B5X3RvL2Zyb21faXRlciwgdGhleSBtYXkgdXNlIHRoZQ0KPj4g ICAgICBkZWZhdWx0Lg0KPiANCj4gRGlkIEkgbWlzcyB0aGlzIHNlcmllcyBvciBhcmUgeW91IHRh bGtpbmcgYWJvdXQgdGhpcyBvbmU/DQo+IGh0dHBzOi8vbG9yZS5rZXJuZWwub3JnL2FsbC8yMDIx MTAxODA0NDA1NC4xNzc5NDI0LTEtaGNoQGxzdC5kZS8NCg0KSSB3YXMgcmVmZXJyaW5nIHRvDQog DQpodHRwOi8vZ2l0LmluZnJhZGVhZC5vcmcvdXNlcnMvaGNoL21pc2MuZ2l0L3Nob3J0bG9nL3Jl ZnMvaGVhZHMvZGF4LWRldmlydHVhbGl6ZQ0KdGhhdCBoYXMgbm90IGNvbWUgb3V0IHlldCwgSSBz YWlkIGVhcmx5IG9uIHRoYXQgSSdsbCByZWJhc2Ugb24gaXQsDQpidXQgbG9va3MgbGlrZSB3ZSBz dGlsbCBuZWVkIHBtZW1fY29weV90by9mcm9tX2l0ZXIoKSwgc28uDQoNCj4gDQo+PiBJJ20gbm90 IHN1cmUgYWJvdXQgbm92YSBhbmQgb3RoZXJzLCBpZiB0aGV5IHVzZSBkaWZmZXJlbnQgJ3dyaXRl JyBvdGhlcg0KPj4gdGhhbiB2aWEgaW9tYXAsIGRvZXMgdGhhdCBtZWFuIHRoZXJlIHdpbGwgYmUg bmVlZCBmb3IgYSBuZXcgc2V0IG9mDQo+PiBkYXhfb3AgZm9yIHRoZWlyIHJlYWQvd3JpdGU/DQo+ IA0KPiBObywgdGhleSdyZSBvdXQtb2YtdHJlZSB0aGV5J2xsIGFkanVzdCB0byB0aGUgc2FtZSBp bnRlcmZhY2UgdGhhdCB4ZnMNCj4gYW5kIGV4dDQgYXJlIHVzaW5nIHdoZW4vaWYgdGhleSBnbyB1 cHN0cmVhbS4NCj4gDQo+PiB0aGUgMy1pbi0xIGJpbmRpbmcgd291bGQgYWx3YXlzIGJlDQo+PiBy ZXF1aXJlZCB0aG91Z2guIE1heWJlIHRoYXQnbGwgYmUgYW4gb25nb2luZyBkaXNjdXNzaW9uPw0K PiANCj4gWWVhaCwgbGV0J3MgY3Jvc3MgdGhhdCBicmlkZ2Ugd2hlbiB3ZSBjb21lIHRvIGl0Lg0K PiANCj4+IENvbW1lbnRzPyBTdWdnZXN0aW9ucz8NCj4gDQo+IEl0IHNvdW5kcyBncmVhdCB0byBt ZSENCj4gDQoNClRoYW5rcyEgIEknbGwgc2VuZCBvdXQgYW4gdXBkYXRlZCBwYXRjaHNldCB3aGVu IGl0J3MgcmVhZHkuDQoNCi1qYW5lDQoNCg0K 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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id A5639C433F5 for ; Thu, 4 Nov 2021 20:32:14 +0000 (UTC) Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) (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 425FD61186 for ; Thu, 4 Nov 2021 20:32:14 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 425FD61186 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=oracle.com Authentication-Results: mail.kernel.org; spf=tempfail smtp.mailfrom=redhat.com Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-300--mvvcP8RPeqANqs3X2YOCg-1; Thu, 04 Nov 2021 16:32:09 -0400 X-MC-Unique: -mvvcP8RPeqANqs3X2YOCg-1 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.phx2.redhat.com [10.5.11.16]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 2A0259126D; Thu, 4 Nov 2021 20:31:59 +0000 (UTC) Received: from colo-mx.corp.redhat.com (colo-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.20]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 82DD25C25D; Thu, 4 Nov 2021 20:31:58 +0000 (UTC) Received: from lists01.pubmisc.prod.ext.phx2.redhat.com (lists01.pubmisc.prod.ext.phx2.redhat.com [10.5.19.33]) by colo-mx.corp.redhat.com (Postfix) with ESMTP id 12B7A1806D03; Thu, 4 Nov 2021 20:31:57 +0000 (UTC) Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.rdu2.redhat.com [10.11.54.1]) by lists01.pubmisc.prod.ext.phx2.redhat.com (8.13.8/8.13.8) with ESMTP id 1A4KRhCv021778 for ; Thu, 4 Nov 2021 16:27:43 -0400 Received: by smtp.corp.redhat.com (Postfix) id DF14040CFD11; Thu, 4 Nov 2021 20:27:42 +0000 (UTC) Received: from mimecast-mx02.redhat.com (mimecast03.extmail.prod.ext.rdu2.redhat.com [10.11.55.19]) by smtp.corp.redhat.com (Postfix) with ESMTPS id D813340CFD0A for ; Thu, 4 Nov 2021 20:27:42 +0000 (UTC) Received: from us-smtp-1.mimecast.com (us-smtp-delivery-1.mimecast.com [205.139.110.120]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id BA329811E7A for ; Thu, 4 Nov 2021 20:27:42 +0000 (UTC) Received: from mx0b-00069f02.pphosted.com (mx0b-00069f02.pphosted.com [205.220.177.32]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-318-8xLaRAZFMx6ctBZm0bw6gQ-1; Thu, 04 Nov 2021 16:27:39 -0400 X-MC-Unique: 8xLaRAZFMx6ctBZm0bw6gQ-1 Received: from pps.filterd (m0246630.ppops.net [127.0.0.1]) by mx0b-00069f02.pphosted.com (8.16.1.2/8.16.1.2) with SMTP id 1A4KOSH2009207; Thu, 4 Nov 2021 20:27:26 GMT Received: from aserp3020.oracle.com (aserp3020.oracle.com [141.146.126.70]) by mx0b-00069f02.pphosted.com with ESMTP id 3c3n8pa9ss-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 04 Nov 2021 20:27:26 +0000 Received: from pps.filterd (aserp3020.oracle.com [127.0.0.1]) by aserp3020.oracle.com (8.16.1.2/8.16.1.2) with SMTP id 1A4KCIRS145552; Thu, 4 Nov 2021 20:27:25 GMT Received: from nam10-bn7-obe.outbound.protection.outlook.com (mail-bn7nam10lp2108.outbound.protection.outlook.com [104.47.70.108]) by aserp3020.oracle.com with ESMTP id 3c0wv8b90u-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 04 Nov 2021 20:27:24 +0000 Received: from SJ0PR10MB4429.namprd10.prod.outlook.com (2603:10b6:a03:2d1::14) by BYAPR10MB3512.namprd10.prod.outlook.com (2603:10b6:a03:11b::22) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4669.13; Thu, 4 Nov 2021 20:27:21 +0000 Received: from SJ0PR10MB4429.namprd10.prod.outlook.com ([fe80::418c:dfe4:f3ee:feaa]) by SJ0PR10MB4429.namprd10.prod.outlook.com ([fe80::418c:dfe4:f3ee:feaa%6]) with mapi id 15.20.4669.011; Thu, 4 Nov 2021 20:27:21 +0000 From: Jane Chu To: Dan Williams Thread-Topic: [dm-devel] [PATCH 0/6] dax poison recovery with RWF_RECOVERY_DATA flag Thread-Index: AQHXxhAze/H2dZp4I0O0xNcfyRn+pqvdUicAgADsdoCAAELPAIABAAaAgAbwJYCAASa6gIAIPpYAgADknQCAAWBnAIAAPDYAgADIRwCAAIRIgIAAJDSAgAAHXwCAABhYAA== Date: Thu, 4 Nov 2021 20:27:21 +0000 Message-ID: <342eb71c-0aff-77e5-3c71-92224d7d48e0@oracle.com> References: <2102a2e6-c543-2557-28a2-8b0bdc470855@oracle.com> <20211028002451.GB2237511@magnolia> <6d21ece1-0201-54f2-ec5a-ae2f873d46a3@oracle.com> In-Reply-To: Accept-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: user-agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:91.0) Gecko/20100101 Thunderbird/91.2.1 x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: d5f7557e-19b7-4953-f50f-08d99fd18116 x-ms-traffictypediagnostic: BYAPR10MB3512: x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:10000 x-ms-exchange-senderadcheck: 1 x-ms-exchange-antispam-relay: 0 x-microsoft-antispam: BCL:0 x-microsoft-antispam-message-info: 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 x-forefront-antispam-report: CIP:255.255.255.255; CTRY:; LANG:en; SCL:1; SRV:; IPV:NLI; SFV:NSPM; H:SJ0PR10MB4429.namprd10.prod.outlook.com; PTR:; CAT:NONE; SFS:(366004)(53546011)(91956017)(76116006)(66556008)(66946007)(6506007)(66476007)(186003)(316002)(2616005)(83380400001)(5660300002)(2906002)(31686004)(64756008)(66446008)(31696002)(7416002)(8936002)(6512007)(54906003)(71200400001)(26005)(44832011)(86362001)(4326008)(966005)(38070700005)(6916009)(8676002)(36756003)(6486002)(122000001)(508600001)(38100700002)(45980500001)(43740500002); DIR:OUT; SFP:1101 x-ms-exchange-antispam-messagedata-chunkcount: 1 x-ms-exchange-antispam-messagedata-0: =?utf-8?B?WTNSUE16MjgvUUlHMHg4L0JLbjRYZFBTaEJ0cW11ck9pVDVtYnlhWGd5Y1Rx?= =?utf-8?B?THpzY2tRSDlnZUorS2VHeDJ4YWtGaFNwamJKMnB4aHJ0eTllc2NjcElNK1BJ?= =?utf-8?B?TlhsRFJNdWFEbm8yc2VKVHZEM2VHbkwvNmdSSlo2MGJkRm0vMGVPOWVZWGpn?= =?utf-8?B?MDVDRm04NUxXcmg4S1BZZmhlVkRJcWlJWStNWERtRkR5MlFxL2V3UDBHNUVB?= =?utf-8?B?UEtUS1ovUkxsVTNGQkhCUlc0aTZQNlFTUlFwK2Q5T0huSUtxNUxxYTJtdnd0?= =?utf-8?B?RzVCRmxzd1BGcE1tNVlIaFNEekFYaDBTcTRHaFN5L00xbTZkWUVsSzdtMUtG?= =?utf-8?B?RFRLbVZsMDhaMTlSMVQ2QXhJcUlqUmlreFd0Q0QzNEhVb0ZGL3FoNStvQ215?= =?utf-8?B?bTJDbjJoK1FYUHJWRHFWRTlJSVhaNGIvNDVqK2FnQWpiUkwxZnNPbFFkNHN0?= =?utf-8?B?MjhicVFZd0NlWTJhZFVQcHdEOGlCVFVST29uNThvb1NWQlE5aGNiczV1aVky?= =?utf-8?B?b2cwRUJHOGRpTzNyMHdVNUxYQ3dETHZCb2xJTGg2Y2FaK25WKzI0MWhpVFRj?= =?utf-8?B?eVRPdWR5RlpqcUhmOElWSnAycStaczA2Sk44bGxpUDhWN0Mwa3kvUEJsaGE4?= =?utf-8?B?MTJvckswdHZYYU4wRFBHbVZwNE0xQW5DSXFZeGp1WUVzVlB5SlNIUTNFeDVy?= =?utf-8?B?aWk5ZmVkUFNwc21qelNuR3ROeFBnYkpuOStvVGcrODM3M2VSVDFGZlFTSkRm?= =?utf-8?B?WWFqY0g5bTlma0xlZVZscUI2TERGMEZremJDenFsd0JmZjJJNmtYb3RvRkNN?= =?utf-8?B?bTNpQlh1VjNMc0Y4cE1ZM1dCYkZTcWZ0NUFoVFJ6YUhNMnQ5QnR5VjBxRnB6?= =?utf-8?B?cW9HcjVTMzVyTWJIdEZnY2I0ZS9mYUpScy93NzZKLy9ITkRLb0VlY1poN3ZT?= =?utf-8?B?VTZRSGRtOGMzeUFoeURnN1JFSWg3QkxaaHR0d2dWSlExOXpIQ1l0RXJUWGlW?= =?utf-8?B?N3V3V3Z6OVpDMDVOTWpqY0ZoWnpqRnh6MVlWMnV0NzczK0w1aU1IWnQzckov?= =?utf-8?B?WTF3bXpibVd6bFdnQWhaRGs1aldlM3FmRHdkK1ZaTFQ0ZmE3TGFXMExCQUFK?= =?utf-8?B?Smc4bU5wNmhnalphNGIzUmtiV09qRHZ3SmY1YmpvVExuZ1BXa05xS3pqTzNl?= =?utf-8?B?M2tLSDZsSXhJeG9MamNqM1JhSEpnanYyZjA4c1pMeTRnNkNlUVNuUWJERHBm?= =?utf-8?B?RWxaNEpvaVVqU2cvaVhDUElSVkl0KzkwS3lLdm1kU25ZOXpiOE0wakpjVCti?= =?utf-8?B?UVpJc01sSmJWMHVzZ0NYWXJoYnVXZFoxNXlzcUZwY21SblplTDBTWkN5OTVQ?= =?utf-8?B?RGZIYXdUbUVzUWlrdlFFY2t2NkkxQUJnNmxjSVU3N0JNZjhYdWFKT0xERWdi?= =?utf-8?B?RW1LREFtZkdyNC83T0d5aHFBTlNrTEZ6SzhBNU5Fb1hHMmo0MXF5eC81VVRY?= =?utf-8?B?RGF2UTVKK1ArSnZYMnFGZmgzTG1oa0dWbU1hSzBNc3I0RDRUTTZIeERDNzBr?= =?utf-8?B?d3pSNTV1eTBQak5uMnVCQlhYNDM0amhTWDU0OVZRVTdMR3hJaTMvejZSdUxY?= =?utf-8?B?aFhRUU1rS2Z4VXZ0aGwvN21uUTZ1dFI3RXZLdm9qb2dUcXc3RnFQRHg0dmNj?= =?utf-8?B?NnZIRDJVY1pCeU9aK3RFaXJzT0VXKys5VlNDMmhHRDQzb0NBYXM5clhIVU1D?= =?utf-8?B?TWlaS2w4ckdoUnlSM3NZeTZwc2RwTWp3ZGdxVFhHcmErek1oUVdKNDRkQmFa?= =?utf-8?B?VkhtbGY3WDQ5TEt5WTErV282ZFhTOXVTcUFYRGVOMnIwYzlYMXM1OFh0SzYv?= =?utf-8?B?cWg5L29tdkhYdlJReVRPN1o5VEszM2REVE5ib3dqS1FXamZwT29jR044OE5D?= =?utf-8?B?WDgwdmJqWVRYcUJrREtTVG1aSnNtLzFrVlM3bjZvRVVRN2pHTEdaRmFOTGtw?= =?utf-8?B?RkNpa3RCckhTdjhwanpKbzkxVjJLVGdObURJL252V0k0T0ZkTWFUK1J3eVZG?= =?utf-8?B?VDJVQm10OTdLNzU2K2k3ZFJkYkNMYkhMVUhlek1HajZHUDl5MzJDSUhrSzlw?= =?utf-8?B?cUxEVkVvMDRLOG5DUXY0YjdOTjVRT2pYcElxdXhDQ3Rud204WkNacmZ0eGw5?= =?utf-8?B?bmc9PQ==?= MIME-Version: 1.0 X-OriginatorOrg: oracle.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: SJ0PR10MB4429.namprd10.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: d5f7557e-19b7-4953-f50f-08d99fd18116 X-MS-Exchange-CrossTenant-originalarrivaltime: 04 Nov 2021 20:27:21.1307 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 4e2c6054-71cb-48f1-bd6c-3a9705aca71b X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: qwTZ8tAJo9JoIQXbJsnre4zoiwrl2GNkI63NifPwmqew6+15Gndyr3A/HhATlxfXqSHlDfGgX3F04LTr7IyIkA== X-MS-Exchange-Transport-CrossTenantHeadersStamped: BYAPR10MB3512 X-Proofpoint-Virus-Version: vendor=nai engine=6300 definitions=10158 signatures=668683 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 bulkscore=0 phishscore=0 malwarescore=0 mlxscore=0 suspectscore=0 mlxlogscore=999 adultscore=0 spamscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2110150000 definitions=main-2111040079 X-Proofpoint-ORIG-GUID: -RF93fyzrJTKJjpOAWzZi2b8YO7cagdY X-Proofpoint-GUID: -RF93fyzrJTKJjpOAWzZi2b8YO7cagdY 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 2.84 on 10.11.54.1 X-MIME-Autoconverted: from base64 to 8bit by lists01.pubmisc.prod.ext.phx2.redhat.com id 1A4KRhCv021778 X-loop: dm-devel@redhat.com Cc: "nvdimm@lists.linux.dev" , "dave.jiang@intel.com" , "snitzer@redhat.com" , "Darrick J. Wong" , "david@fromorbit.com" , "linux-kernel@vger.kernel.org" , "willy@infradead.org" , Christoph Hellwig , "dm-devel@redhat.com" , "vgoyal@redhat.com" , "vishal.l.verma@intel.com" , "linux-fsdevel@vger.kernel.org" , "ira.weiny@intel.com" , "linux-xfs@vger.kernel.org" , "agk@redhat.com" Subject: Re: [dm-devel] [PATCH 0/6] dax poison recovery with RWF_RECOVERY_DATA flag 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 10.5.11.16 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-Language: en-US Content-ID: <01DCC2ACCEEBC54EBF7311E72E96B3BD@namprd10.prod.outlook.com> Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit On 11/4/2021 12:00 PM, Dan Williams wrote: >> >> If this understanding is in the right direction, then I'd like to >> propose below changes to >> dax_direct_access(), dax_copy_to/from_iter(), pmem_copy_to/from_iter() >> and the dm layer copy_to/from_iter, dax_iomap_iter(). >> >> 1. dax_iomap_iter() rely on dax_direct_access() to decide whether there >> is likely media error: if the API without DAX_F_RECOVERY returns >> -EIO, then switch to recovery-read/write code. In recovery code, >> supply DAX_F_RECOVERY to dax_direct_access() in order to obtain >> 'kaddr', and then call dax_copy_to/from_iter() with DAX_F_RECOVERY. > > I like it. It allows for an atomic write+clear implementation on > capable platforms and coordinates with potentially unmapped pages. The > best of both worlds from the dax_clear_poison() proposal and my "take > a fault and do a slow-path copy". > >> 2. the _copy_to/from_iter implementation would be largely the same >> as in my recent patch, but some changes in Christoph's >> 'dax-devirtualize' maybe kept, such as DAX_F_VIRTUAL, obviously >> virtual devices don't have the ability to clear poison, so no need >> to complicate them. And this also means that not every endpoint >> dax device has to provide dax_op.copy_to/from_iter, they may use the >> default. > > Did I miss this series or are you talking about this one? > https://lore.kernel.org/all/20211018044054.1779424-1-hch@lst.de/ I was referring to http://git.infradead.org/users/hch/misc.git/shortlog/refs/heads/dax-devirtualize that has not come out yet, I said early on that I'll rebase on it, but looks like we still need pmem_copy_to/from_iter(), so. > >> I'm not sure about nova and others, if they use different 'write' other >> than via iomap, does that mean there will be need for a new set of >> dax_op for their read/write? > > No, they're out-of-tree they'll adjust to the same interface that xfs > and ext4 are using when/if they go upstream. > >> the 3-in-1 binding would always be >> required though. Maybe that'll be an ongoing discussion? > > Yeah, let's cross that bridge when we come to it. > >> Comments? Suggestions? > > It sounds great to me! > Thanks! I'll send out an updated patchset when it's ready. -jane -- dm-devel mailing list dm-devel@redhat.com https://listman.redhat.com/mailman/listinfo/dm-devel