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=-6.9 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,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 9DB5EC433E0 for ; Sun, 24 May 2020 14:05:36 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 0F8F7206DD for ; Sun, 24 May 2020 14:05:35 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=hammerspace.com header.i=@hammerspace.com header.b="A9mRWvAF" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 0F8F7206DD Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=hammerspace.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 95C0A80008; Sun, 24 May 2020 10:05:35 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 90BF680007; Sun, 24 May 2020 10:05:35 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 7FB3180008; Sun, 24 May 2020 10:05:35 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0046.hostedemail.com [216.40.44.46]) by kanga.kvack.org (Postfix) with ESMTP id 65ABA80007 for ; Sun, 24 May 2020 10:05:35 -0400 (EDT) Received: from smtpin17.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay05.hostedemail.com (Postfix) with ESMTP id 1EB9A181AEF00 for ; Sun, 24 May 2020 14:05:35 +0000 (UTC) X-FDA: 76851785430.17.ice09_13900df2d6941 Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin17.hostedemail.com (Postfix) with ESMTP id 064A9180D079F for ; Sun, 24 May 2020 14:05:35 +0000 (UTC) X-HE-Tag: ice09_13900df2d6941 X-Filterd-Recvd-Size: 10145 Received: from NAM11-DM6-obe.outbound.protection.outlook.com (mail-dm6nam11on2095.outbound.protection.outlook.com [40.107.223.95]) by imf14.hostedemail.com (Postfix) with ESMTP for ; Sun, 24 May 2020 14:05:34 +0000 (UTC) ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=ofrm+h3lYEE9tpgs960lOvLpNMKJPI7uf3XSnyXgXbeC5Bh/evuQ5kbABjtpGL3LIWYtc95IgxE2nAWKZ5+/kNjFTzF6sBNMYqXkHhNzAWiEtazdk9yXkI5JkLqJu9IWn6XpdWzKpg3bIei2Vfe8yeJnWPv5+iZlvdl8GS11x5idyJaBwsyFxcXqHaLEmGjvDBniwkkDGFLwnzWeuARux+7wbAFcUwcxHgdOpuSUG87cHM3SDlv4GPjlhtSgjSfHba+DZ865mqvia3aEwhoRHyDW0ZKM35MqrjtqZd84RhkuLs1Bor9UYdD3A73cRzO4G8IAVJ+gC7U0is+8MnQlmg== 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=qDdupJoyjbIOg8U4UFqvWafTJwAWxJcGp/fD51v9YDc=; b=Uk/akTgwf2Aa9jPZxBcg60/oI8n8yqydXydAnk2OeVvFTP0UuNPHrQRZmZKkvFOwuhN+Qt02WbJnXjWErXfotDxHjoU86yIEni7EuUT4qN1a8kqo0BuMupQACeKGKJdg0fZF8h9Mju8hiOQXGP+zrn6pygG+p09h89RMg5QPlc6nNNMyO39/N1dEgBusQZ4wH02fa4FhUaE10kwtQAyVVl+ZKYxSR6UEyX1zzszCX6RFZTJCt4TQBvlvs/AP7aDj/46PSBXy9eWqi+tu4UCUi+AchrQqiLRg9xEp1gGNm8mjRLNKHKVRTJHUIaiaNs4paylhg5Xm4d78Y5yDatVlbg== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=hammerspace.com; dmarc=pass action=none header.from=hammerspace.com; dkim=pass header.d=hammerspace.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=hammerspace.com; s=selector2; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=qDdupJoyjbIOg8U4UFqvWafTJwAWxJcGp/fD51v9YDc=; b=A9mRWvAF3MBLCYmGsFS3QWBaJq+scCc3r5LXMaHUKJh5RgAB7EzJ9ljFZ17h2QM6KRtw/qTXIst+Mqewma2bulxvHc+GLuXYGj13TG9u9R8pKz+7wvuFBWJ0RkCGCfLmqe8hjNXQLf0sR8uH07Ua/EIw7yL9RrotejAsf26r/qA= Received: from CH2PR13MB3398.namprd13.prod.outlook.com (2603:10b6:610:2a::33) by CH2PR13MB3448.namprd13.prod.outlook.com (2603:10b6:610:28::10) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3045.9; Sun, 24 May 2020 14:05:32 +0000 Received: from CH2PR13MB3398.namprd13.prod.outlook.com ([fe80::49f6:ce9b:9803:2493]) by CH2PR13MB3398.namprd13.prod.outlook.com ([fe80::49f6:ce9b:9803:2493%6]) with mapi id 15.20.3045.009; Sun, 24 May 2020 14:05:31 +0000 From: Trond Myklebust To: "axboe@kernel.dk" , "io-uring@vger.kernel.org" CC: "linux-mm@kvack.org" , "linux-fsdevel@vger.kernel.org" , "linux-kernel@vger.kernel.org" Subject: Re: [PATCH 05/12] mm: support async buffered reads in generic_file_buffered_read() Thread-Topic: [PATCH 05/12] mm: support async buffered reads in generic_file_buffered_read() Thread-Index: AQHWMTQyNgEk/N+TVkeE2BGKfkqi2qi3RlkA Date: Sun, 24 May 2020 14:05:31 +0000 Message-ID: <264614fc4fa08df2b0899da1cd38bb07150cd7f3.camel@hammerspace.com> References: <20200523185755.8494-1-axboe@kernel.dk> <20200523185755.8494-6-axboe@kernel.dk> In-Reply-To: <20200523185755.8494-6-axboe@kernel.dk> Accept-Language: en-US, en-GB Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: kernel.dk; dkim=none (message not signed) header.d=none;kernel.dk; dmarc=none action=none header.from=hammerspace.com; x-originating-ip: [68.36.133.222] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: 224fc63b-e9ed-4619-6acf-08d7ffeb858e x-ms-traffictypediagnostic: CH2PR13MB3448: x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:4714; x-forefront-prvs: 0413C9F1ED x-ms-exchange-senderadcheck: 1 x-microsoft-antispam: BCL:0; x-microsoft-antispam-message-info: MnAx/qT9JUCNF8HxvqOWDhZXoIPsVQffF7OCxD5SFRne1WlH/Y1p7KjIk0/+KsKZLycIg/potbNMoe42E4eo/WcTBETbRjk5NFa1gJ8rglj0PSkqe+XlIqDJpt6qm/4wYUl2WeVP4CQh3hYsIAxP5ZjFKjLdTwWawS1BSVL6jNN63SYd9JtJ6Wxv2+dMS2lKi337DBLLje5wmErREX7TRKQ4ODHyh0Ha73LYSs6tktHrrRzQVWQE7DRmN6GcYftxoXWEPDN9f6GRW5FlX7BlidGRzrbC29poCdOwswMYztkGkP1aB/Rs3Ycr6GlyWoJgq89ogftOa8HqV/SFOi0Nkia7OWXD+8e/usN7yUCJoIfGHWz8TkA3EE4ZF3E00Q3B x-forefront-antispam-report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:CH2PR13MB3398.namprd13.prod.outlook.com;PTR:;CAT:NONE;SFTY:;SFS:(346002)(39830400003)(396003)(376002)(136003)(366004)(6486002)(110136005)(36756003)(478600001)(26005)(2616005)(54906003)(66556008)(8936002)(2906002)(66476007)(5660300002)(86362001)(64756008)(66446008)(71200400001)(186003)(66946007)(6506007)(4326008)(8676002)(6512007)(76116006)(316002)(41533002);DIR:OUT;SFP:1102; x-ms-exchange-antispam-messagedata: JlDrNoCp3zhjun7JmKnhtn6LICBQMiQlpw0G6bSzFPiit1gEkF01UJtBuoOExsu+yj/OMgxyutz8NnFpzE9zhwlk/ACpmibaxdWdwFNj9aydfieO1fqReCgUgxViC+F7bZ4pHv+m70gOj3X0Djazc3UUySDNLPtJ8QY40as4hP6Spca2fnYlHfCLmCVX8vMXG5qCe5o/Dh7ZzaS0ajCgZBhZldtGiCxarYmqxfqeF5sfHS01clnH/+rcOqnimiLzES6A17iqwklPOZ86NyrPO0V/5k0l06pFzR7NgPPs7dFG013kWcAwiXhdD+tRloIosPNJBn+RyF6xBGyHu2DshRx02okE2jfpYsc4e2Vhud7PIfRB4iEzQpnoO0Zh+dTASf8Q+c/A4iJt0ptLUaFw8e9n1XVmrjPNMCr89NLYx618lZp2/i8DICbfKAjmShxMNa3sV4zGyvHHeqlezhMkF7YS98BMS5yR+Jm2/ijib44= x-ms-exchange-transport-forked: True Content-Type: text/plain; charset="utf-8" Content-ID: <85C147503CB437449457176356FB74F5@namprd13.prod.outlook.com> Content-Transfer-Encoding: base64 MIME-Version: 1.0 X-OriginatorOrg: hammerspace.com X-MS-Exchange-CrossTenant-Network-Message-Id: 224fc63b-e9ed-4619-6acf-08d7ffeb858e X-MS-Exchange-CrossTenant-originalarrivaltime: 24 May 2020 14:05:31.7586 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 0d4fed5c-3a70-46fe-9430-ece41741f59e X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: T+eSaCiPA9CNVMETEq7h7y5ruLM30C4l8tlfzWHAezGaYYje+FfLgiPR6sfkz3RwQnV6TC1s8R6rTCNUU40P3g== X-MS-Exchange-Transport-CrossTenantHeadersStamped: CH2PR13MB3448 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: T24gU2F0LCAyMDIwLTA1LTIzIGF0IDEyOjU3IC0wNjAwLCBKZW5zIEF4Ym9lIHdyb3RlOg0KPiBV c2UgdGhlIGFzeW5jIHBhZ2UgbG9ja2luZyBpbmZyYXN0cnVjdHVyZSwgaWYgSU9DQl9XQUlUUSBp cyBzZXQgaW4NCj4gdGhlDQo+IHBhc3NlZCBpbiBpb2NiLiBUaGUgY2FsbGVyIG11c3QgZXhwZWN0 IGFuIC1FSU9DQlFVRVVFRCByZXR1cm4gdmFsdWUsDQo+IHdoaWNoIG1lYW5zIHRoYXQgSU8gaXMg c3RhcnRlZCBidXQgbm90IGRvbmUgeWV0LiBUaGlzIGlzIHNpbWlsYXIgdG8NCj4gaG93DQo+IE9f RElSRUNUIHNpZ25hbHMgdGhlIHNhbWUgb3BlcmF0aW9uLiBPbmNlIHRoZSBjYWxsYmFjayBpcyBy ZWNlaXZlZCBieQ0KPiB0aGUgY2FsbGVyIGZvciBJTyBjb21wbGV0aW9uLCB0aGUgY2FsbGVyIG11 c3QgcmV0cnkgdGhlIG9wZXJhdGlvbi4NCj4gDQo+IFNpZ25lZC1vZmYtYnk6IEplbnMgQXhib2Ug PGF4Ym9lQGtlcm5lbC5kaz4NCj4gLS0tDQo+ICBtbS9maWxlbWFwLmMgfCAzMyArKysrKysrKysr KysrKysrKysrKysrKysrKy0tLS0tLS0NCj4gIDEgZmlsZSBjaGFuZ2VkLCAyNiBpbnNlcnRpb25z KCspLCA3IGRlbGV0aW9ucygtKQ0KPiANCj4gZGlmZiAtLWdpdCBhL21tL2ZpbGVtYXAuYyBiL21t L2ZpbGVtYXAuYw0KPiBpbmRleCBjNzQ2NTQxYjFkNDkuLmEzYjg2YzlhY2RjOCAxMDA2NDQNCj4g LS0tIGEvbW0vZmlsZW1hcC5jDQo+ICsrKyBiL21tL2ZpbGVtYXAuYw0KPiBAQCAtMTIxOSw2ICsx MjE5LDE0IEBAIHN0YXRpYyBpbnQgX193YWl0X29uX3BhZ2VfbG9ja2VkX2FzeW5jKHN0cnVjdA0K PiBwYWdlICpwYWdlLA0KPiAgCXJldHVybiByZXQ7DQo+ICB9DQo+ICANCj4gK3N0YXRpYyBpbnQg d2FpdF9vbl9wYWdlX2xvY2tlZF9hc3luYyhzdHJ1Y3QgcGFnZSAqcGFnZSwNCj4gKwkJCQkgICAg IHN0cnVjdCB3YWl0X3BhZ2VfcXVldWUgKndhaXQpDQo+ICt7DQo+ICsJaWYgKCFQYWdlTG9ja2Vk KHBhZ2UpKQ0KPiArCQlyZXR1cm4gMDsNCj4gKwlyZXR1cm4gX193YWl0X29uX3BhZ2VfbG9ja2Vk X2FzeW5jKGNvbXBvdW5kX2hlYWQocGFnZSksIHdhaXQsDQo+IGZhbHNlKTsNCj4gK30NCj4gKw0K PiAgLyoqDQo+ICAgKiBwdXRfYW5kX3dhaXRfb25fcGFnZV9sb2NrZWQgLSBEcm9wIGEgcmVmZXJl bmNlIGFuZCB3YWl0IGZvciBpdCB0bw0KPiBiZSB1bmxvY2tlZA0KPiAgICogQHBhZ2U6IFRoZSBw YWdlIHRvIHdhaXQgZm9yLg0KPiBAQCAtMjA1OCwxNyArMjA2NiwyNSBAQCBzdGF0aWMgc3NpemVf dA0KPiBnZW5lcmljX2ZpbGVfYnVmZmVyZWRfcmVhZChzdHJ1Y3Qga2lvY2IgKmlvY2IsDQo+ICAJ CQkJCWluZGV4LCBsYXN0X2luZGV4IC0gaW5kZXgpOw0KPiAgCQl9DQo+ICAJCWlmICghUGFnZVVw dG9kYXRlKHBhZ2UpKSB7DQo+IC0JCQlpZiAoaW9jYi0+a2lfZmxhZ3MgJiBJT0NCX05PV0FJVCkg ew0KPiAtCQkJCXB1dF9wYWdlKHBhZ2UpOw0KPiAtCQkJCWdvdG8gd291bGRfYmxvY2s7DQo+IC0J CQl9DQo+IC0NCj4gIAkJCS8qDQo+ICAJCQkgKiBTZWUgY29tbWVudCBpbiBkb19yZWFkX2NhY2hl X3BhZ2Ugb24gd2h5DQo+ICAJCQkgKiB3YWl0X29uX3BhZ2VfbG9ja2VkIGlzIHVzZWQgdG8gYXZv aWQNCj4gdW5uZWNlc3NhcmlseQ0KPiAgCQkJICogc2VyaWFsaXNhdGlvbnMgYW5kIHdoeSBpdCdz IHNhZmUuDQo+ICAJCQkgKi8NCj4gLQkJCWVycm9yID0gd2FpdF9vbl9wYWdlX2xvY2tlZF9raWxs YWJsZShwYWdlKTsNCj4gKwkJCWlmIChpb2NiLT5raV9mbGFncyAmIElPQ0JfV0FJVFEpIHsNCj4g KwkJCQlpZiAod3JpdHRlbikgew0KPiArCQkJCQlwdXRfcGFnZShwYWdlKTsNCj4gKwkJCQkJZ290 byBvdXQ7DQo+ICsJCQkJfQ0KPiArCQkJCWVycm9yID0gd2FpdF9vbl9wYWdlX2xvY2tlZF9hc3lu YyhwYWdlLA0KPiArCQkJCQkJCQlpb2NiLQ0KPiA+cHJpdmF0ZSk7DQoNCklmIGl0IGlzIGJlaW5n IHVzZWQgaW4gJ2dlbmVyaWNfZmlsZV9idWZmZXJlZF9yZWFkKCknIGFzIHN0b3JhZ2UgZm9yIGEN CndhaXQgcXVldWUsIHRoZW4gaXQgaXMgaGFyZCB0byBjb25zaWRlciB0aGlzIGEgJ3ByaXZhdGUn IGZpZWxkLg0KDQpQZXJoYXBzIGVpdGhlciByZW5hbWUgYW5kIGFkZCB0eXBlIGNoZWNraW5nLCBv ciBlbHNlIGFkZCBhIHNlcGFyYXRlDQpmaWVsZCBhbHRvZ2V0aGVyIHRvIHN0cnVjdCBraW9jYj8N Cg0KPiArCQkJfSBlbHNlIHsNCj4gKwkJCQlpZiAoaW9jYi0+a2lfZmxhZ3MgJiBJT0NCX05PV0FJ VCkgew0KPiArCQkJCQlwdXRfcGFnZShwYWdlKTsNCj4gKwkJCQkJZ290byB3b3VsZF9ibG9jazsN Cj4gKwkJCQl9DQo+ICsJCQkJZXJyb3IgPQ0KPiB3YWl0X29uX3BhZ2VfbG9ja2VkX2tpbGxhYmxl KHBhZ2UpOw0KPiArCQkJfQ0KPiAgCQkJaWYgKHVubGlrZWx5KGVycm9yKSkNCj4gIAkJCQlnb3Rv IHJlYWRwYWdlX2Vycm9yOw0KPiAgCQkJaWYgKFBhZ2VVcHRvZGF0ZShwYWdlKSkNCj4gQEAgLTIx NTYsNyArMjE3MiwxMCBAQCBzdGF0aWMgc3NpemVfdA0KPiBnZW5lcmljX2ZpbGVfYnVmZmVyZWRf cmVhZChzdHJ1Y3Qga2lvY2IgKmlvY2IsDQo+ICANCj4gIHBhZ2Vfbm90X3VwX3RvX2RhdGU6DQo+ ICAJCS8qIEdldCBleGNsdXNpdmUgYWNjZXNzIHRvIHRoZSBwYWdlIC4uLiAqLw0KPiAtCQllcnJv ciA9IGxvY2tfcGFnZV9raWxsYWJsZShwYWdlKTsNCj4gKwkJaWYgKGlvY2ItPmtpX2ZsYWdzICYg SU9DQl9XQUlUUSkNCj4gKwkJCWVycm9yID0gbG9ja19wYWdlX2FzeW5jKHBhZ2UsIGlvY2ItPnBy aXZhdGUpOw0KPiArCQllbHNlDQo+ICsJCQllcnJvciA9IGxvY2tfcGFnZV9raWxsYWJsZShwYWdl KTsNCj4gIAkJaWYgKHVubGlrZWx5KGVycm9yKSkNCj4gIAkJCWdvdG8gcmVhZHBhZ2VfZXJyb3I7 DQo+ICANCi0tIA0KVHJvbmQgTXlrbGVidXN0DQpMaW51eCBORlMgY2xpZW50IG1haW50YWluZXIs IEhhbW1lcnNwYWNlDQp0cm9uZC5teWtsZWJ1c3RAaGFtbWVyc3BhY2UuY29tDQoNCg0K