Received: by 2002:a05:6602:18e:0:0:0:0 with SMTP id m14csp1732721ioo; Mon, 23 May 2022 01:50:29 -0700 (PDT) X-Google-Smtp-Source: ABdhPJyuaa6ymEhW3IdeH17Lo1nh/I6+Q0elmV8LepbFDwVIpV5i9E/yvVEftl6XNwdvp64ANKHl X-Received: by 2002:a17:903:11c7:b0:151:9769:3505 with SMTP id q7-20020a17090311c700b0015197693505mr21863747plh.72.1653295828987; Mon, 23 May 2022 01:50:28 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1653295828; cv=none; d=google.com; s=arc-20160816; b=BKw63Ta9s8xUfiswX5q/hW8Al6N6ywqvb9zQw5puseM0AUEaR0sx9P3ftgY6LgPxjW vHsCv8IRK0Q8v//GId+dQh5kmmyHkKwwrhvJOgTILz1Ltvz3drKPZ92pyNkpVyAecZEX PW19WFnht6wJfkGZ7p9UL0Fl8CDYnx1rNueisvLOairFMc2CfOX5KCGzpBKHR3WuRzai QuZlfJvUGfrfkA5WOBLa50Y6tUbtEEav7vOEOIcVqyfmnNsN7jAaXD0gGTGZTKsvP5P9 IuDpJ97bVQS+uApdbKyqjJUw/uMKngfBDvDsoQf3y3CyfB2ox3OrEWwH19l/yCMlrPSP KhYQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:content-transfer-encoding:content-language :mime-version:accept-language:in-reply-to:references:message-id:date :thread-index:thread-topic:subject:cc:to:from; bh=zLlH3y+vbbG4LaXER3YepnEpA2UAgHhydoTgduC2MhU=; b=sQd8B/KK4aXvh2N4rRR09uSKTmZeExB+DgK/RT2ncGvmjl6vPsLmkyIbB19ue4BTZ2 Yvem5owYaCiKCy8XKW9f40HKoGdrU7N4C+eDnbbVb0z8274KM1AJlhdING8ky0Cw/BL6 dBK9yEdNy49gntJmNrg+KH9skZBWB7OwwCJJsanivPpEWA+Ys0k4OI1Lzug1xdL5m6TP pFvOrxCbQykSHncyT2q0yZHf557tGJqlCG49I8ydGvJxjBorlgVDDVv4pvg5DX2NHwvq DI7HDNcSTc2+Uej3zfGCZ6M2l5JJT2p4iTFyObjEDtAZB7b6THHE22cAZe6uQmSnT5PP Ju3Q== ARC-Authentication-Results: i=1; mx.google.com; spf=softfail (google.com: domain of transitioning linux-kernel-owner@vger.kernel.org does not designate 23.128.96.19 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=aculab.com Return-Path: Received: from lindbergh.monkeyblade.net (lindbergh.monkeyblade.net. [23.128.96.19]) by mx.google.com with ESMTPS id n15-20020a170902f60f00b0015ea43982d0si10359901plg.129.2022.05.23.01.50.28 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 23 May 2022 01:50:28 -0700 (PDT) Received-SPF: softfail (google.com: domain of transitioning linux-kernel-owner@vger.kernel.org does not designate 23.128.96.19 as permitted sender) client-ip=23.128.96.19; Authentication-Results: mx.google.com; spf=softfail (google.com: domain of transitioning linux-kernel-owner@vger.kernel.org does not designate 23.128.96.19 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=aculab.com Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 74F59186F9; Mon, 23 May 2022 01:19:24 -0700 (PDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231755AbiEWITL (ORCPT + 99 others); Mon, 23 May 2022 04:19:11 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34552 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231758AbiEWITJ (ORCPT ); Mon, 23 May 2022 04:19:09 -0400 Received: from eu-smtp-delivery-151.mimecast.com (eu-smtp-delivery-151.mimecast.com [185.58.86.151]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id C9FD513FB3 for ; Mon, 23 May 2022 01:19:02 -0700 (PDT) Received: from AcuMS.aculab.com (156.67.243.121 [156.67.243.121]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384) id uk-mta-35-yelfvzMZOpeqA2HWpRXpXQ-1; Mon, 23 May 2022 09:18:59 +0100 X-MC-Unique: yelfvzMZOpeqA2HWpRXpXQ-1 Received: from AcuMS.Aculab.com (fd9f:af1c:a25b:0:994c:f5c2:35d6:9b65) by AcuMS.aculab.com (fd9f:af1c:a25b:0:994c:f5c2:35d6:9b65) with Microsoft SMTP Server (TLS) id 15.0.1497.36; Mon, 23 May 2022 09:18:59 +0100 Received: from AcuMS.Aculab.com ([fe80::994c:f5c2:35d6:9b65]) by AcuMS.aculab.com ([fe80::994c:f5c2:35d6:9b65%12]) with mapi id 15.00.1497.036; Mon, 23 May 2022 09:18:59 +0100 From: David Laight To: 'Jens Axboe' , "'Jason A. Donenfeld'" CC: "viro@zeniv.linux.org.uk" , "linux-kernel@vger.kernel.org" Subject: RE: [PATCH] fs: prefer read_iter over read and write_iter over write Thread-Topic: [PATCH] fs: prefer read_iter over read and write_iter over write Thread-Index: AQHYbFCwvu9LSlrdFk+NviNR2+4IRK0nyjDggABuI4CAABnZcP//82QAgAPZ0QA= Date: Mon, 23 May 2022 08:18:59 +0000 Message-ID: References: <20220520135103.166972-1-Jason@zx2c4.com> <39ed6917f2e64a07bad8dad63f8dceb4@AcuMS.aculab.com> <0da16e16caed4282ae97a86f1ba6f6db@AcuMS.aculab.com> <471e5654-49d7-9023-62b4-fc98483b1d89@kernel.dk> In-Reply-To: <471e5654-49d7-9023-62b4-fc98483b1d89@kernel.dk> Accept-Language: en-GB, en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.202.205.107] MIME-Version: 1.0 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=C51A453 smtp.mailfrom=david.laight@aculab.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: aculab.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: base64 X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,RDNS_NONE, SPF_HELO_NONE,T_SCC_BODY_TEXT_LINE autolearn=no autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org RnJvbTogSmVucyBBeGJvZQ0KPiBTZW50OiAyMCBNYXkgMjAyMiAyMzoxOA0KPiANCj4gT24gNS8y MC8yMiA0OjA4IFBNLCBEYXZpZCBMYWlnaHQgd3JvdGU6DQo+ID4+ICAgIGh0dHBzOi8vbG9yZS5r ZXJuZWwub3JnL2xrbWwvWW9leStGT1lPNjlsUzVxUEB6eDJjNC5jb20vDQo+ID4+DQo+ID4+IFRo ZSBob3BlIGlzIHRoYXQgaXQgZXZlbnR1YWxseSBiZWNvbWVzIGZhc3Rlci4uLiA6LVwNCj4gPg0K PiA+IEkgc3VzcGVjdCBhbGwgdGhlIHh4eF9pdGVyIGZ1bmN0aW9ucyBuZWVkIG9wdGltaXNpbmcg Zm9yDQo+ID4gdGhlIGNvbW1vbiBjYXNlIG9mIGEgc2luZ2xlIGJ1ZmZlciBpbiB1c2Vyc3BhY2Uu DQo+ID4NCj4gPiBUaGF0IGFsc28gaW5jbHVkZXMgdGhlIGNvZGUgdG8gcmVhZCB0aGUgaW92W10g ZnJvbSB1c2VzcGFjZS4NCj4gPiBBdCB0aGUgbW9tZW50IEkgdGhpbmsgdGhlIDMyYml0IGNvbXBh dCBjb2RlIGlzIGFjdHVhbGx5DQo+ID4gZmFzdGVyIHRoYW4gdGhlIG5hdGl2ZSBhbWQ2NCB2ZXJz aW9uIQ0KPiA+IEkndmUgd3JpdHRlbiBzb21lIHBhdGNoZXMgdG8gc3BlZWQgdGhhdCB1cC4NCj4g PiBCdXQgdGhlIGJpZ2dlciBpbXByb3ZlbWVudHMgYWxsIGhpdCBtYXNzaXZlIGNoYW5nZXMNCj4g PiB0byB0aGUgaW9yaW5nIGNvZGUuDQo+IA0KPiBEbyB5b3UgaGF2ZSBhIGxpbmsgdG8gdGhvc2Ug cGF0Y2hlcz8gSSBjYW4gY2VydGFpbmx5IGhlbHAgd2l0aCB0aGUNCj4gaW9fdXJpbmcgc2lkZSBv ZiB0aGluZ3MsIGFuZCBJIGhhdmUgYSBnZW51aW5lIGludGVyZXN0IGluIGltcHJvdmluZyB0aGUN Cj4gY29yZSBhbmQgZ2V0dGluZyB0aGUgaXRlciBzaWRlIHVwIHRvIHNudWZmLg0KDQpJJ2xsIHNl ZSBpZiBJIGNhbiBmaW5kIHRoZW0uDQpTb21lIGJpdHMgb2YgdGhlIGxhc3QgcGF0Y2ggc2V0IGRp ZCBnZXQgYXBwbGllZC4NCg0KT25lIGFpbSB3YXMgdG8gY2hhbmdlIGFsbCB0aGUgY2FsbGVycyBv ZiBpbXBvcnRfaW92ZWMoKQ0KdG8gdXNlIGEgc3RydWN0dXJlIHRoYW4gY29udGFpbmVkIGJvdGgg dGhlICdpb3ZfaXRlcicgYW5kDQp0aGUgJ2lvdnN0YWNrW10nLg0KVGhlIGxpZmV0aW1lcyBvZiB0 aGUgdHdvIHN0cnVjdHVyZXMgYXJlIGVmZmVjdGl2ZWx5IGlkZW50aWNhbC4NCnVzdWFsbHkgdGhl eSBhcmUgYm90aCBhbGxvY2F0ZWQgb24gc3RhY2sgdG9nZXRoZXIuDQoNCk1lcmdpbmcgdGhlbSB3 b3VsZCBzaWduaWZpY2FudGx5IHNpbXBsaWZ5IHRoZSBjYWxsZXJzDQphbmQgcmVkdWNlIHRoZSBu dW1iZXIgb2YgcGFyYW1ldGVycyBwYXNzZWQgdGhyb3VnaA0KbXVsdGlwbGUgbGF5ZXJzIG9mIGZ1 bmN0aW9ucyAtIGVzcGVjaWFsbHkgcG9pbnRlcnMNCnBhc3NlZCBieSB2YWx1ZS4NCg0KVGhhdCBj aGFuZ2UgbmVlZHMgd29yayBkb25lIHRvIHRoZSBpb191cmluZyBjb2RlIHRvIHNhbml0aXNlDQp0 aGUgd2F5IGl0IHVzZXMgdGhlIGlvdnN0YWNrW10gY2FjaGUgYW5kIGFueSBleHRlbmRlZCBrbWFs bG9jKCllZA0KY29weS4NCg0KSSBuZWVkIHRvIGxvb2sgZWxzZXdoZXJlIGZvciB0aGUgb3B0aW1p c2F0aW9uIHRvIGltcG9ydF9pb3ZlYygpDQppdHNlbGYuDQoNCglEYXZpZA0KDQotDQpSZWdpc3Rl cmVkIEFkZHJlc3MgTGFrZXNpZGUsIEJyYW1sZXkgUm9hZCwgTW91bnQgRmFybSwgTWlsdG9uIEtl eW5lcywgTUsxIDFQVCwgVUsNClJlZ2lzdHJhdGlvbiBObzogMTM5NzM4NiAoV2FsZXMpDQo=