Received: by 2002:a25:ca44:0:0:0:0:0 with SMTP id a65csp2473603ybg; Fri, 31 Jul 2020 00:03:18 -0700 (PDT) X-Google-Smtp-Source: ABdhPJwe/JkuCK+rYeT3tMW4GFfZfF9eM2C1reGCBRBbMF8Q+ri7ilKAE6vazr6Go7wjCsXlk7Gm X-Received: by 2002:a17:906:6bda:: with SMTP id t26mr2800877ejs.214.1596178998151; Fri, 31 Jul 2020 00:03:18 -0700 (PDT) ARC-Seal: i=2; a=rsa-sha256; t=1596178998; cv=pass; d=google.com; s=arc-20160816; b=D1GCp6uxw+wyR1tcE+Pg439dhM8kkghq/w2WugR6hIuecCGRSOCnvbMqjt1L1nyJsz 63pMVTFs24Qyte1diFIpTd9zGl1r6itVPZrjuqVATmJZvzYU2aW0UFWR2O80rilrtEob +KvDpZjEO+JEEupp8Bzwr2mEsZVsoa7s6nADQE3LnA3lP7Z0Btg/BDiAwvoWW6E9BjGO Q01XJat9nEhc8r8HDFNZ49jYvff7Kx3XpyOIC6IINLk9YO6pH9K5c0uAT2WAwhJ1c9sn 8gy9dxrDBPRrmtkBCCGyZ1lIdb0yB82MZ9O1B6Z2iJQrV0pm0Olw4KshDENUGXcS9Sd/ fD0Q== ARC-Message-Signature: i=2; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:mime-version:content-transfer-encoding :wdcipoutbound:content-language:accept-language:references :message-id:date:thread-index:thread-topic:subject:cc:to:from :dkim-signature:ironport-sdr:dkim-signature; bh=VHofBGPchJ3wPpn3RBb8zlBcgYl7N7un/W9/Wq4tKpg=; b=SscW7lui4TWvF4nz1iN7QBuRUfMIXF6aLdAhb/roeOl+jK3+jECCfIBROOFISzvbiF 0SMZUS3/bKUCQ8bgPiGfd3peZgoOYNae1hXYUs794i1kPzVb/eZymR9mZ8/GTw7Mp+7n gcUSu8COjCMvXHWWlV8C+CC5N7j/A4aSf/U/3KQvK4WwnTGG+M/mynAfaNBYtfw14Mpy SwOBw0puYdFG1fVWZagoxFJvkMnO8xxT10lTQjBoFgkqaf52vdGxKQ0o2+2v2ivxe62F PXlfvgm8UmTcoHer1fudnx2d2vsVhyVYmf23GhBlbJEukBighR0Mzr2UHCUHQVW09tM4 X0yA== ARC-Authentication-Results: i=2; mx.google.com; dkim=fail header.i=@wdc.com header.s=dkim.wdc.com header.b=ScmkLQdv; dkim=pass header.i=@sharedspace.onmicrosoft.com header.s=selector2-sharedspace-onmicrosoft-com header.b=upaN17NR; arc=pass (i=1 spf=pass spfdomain=wdc.com dkim=pass dkdomain=wdc.com dmarc=pass fromdomain=wdc.com); spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=wdc.com Return-Path: Received: from vger.kernel.org (vger.kernel.org. [23.128.96.18]) by mx.google.com with ESMTP id v7si5749103edd.551.2020.07.31.00.02.55; Fri, 31 Jul 2020 00:03:18 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; dkim=fail header.i=@wdc.com header.s=dkim.wdc.com header.b=ScmkLQdv; dkim=pass header.i=@sharedspace.onmicrosoft.com header.s=selector2-sharedspace-onmicrosoft-com header.b=upaN17NR; arc=pass (i=1 spf=pass spfdomain=wdc.com dkim=pass dkdomain=wdc.com dmarc=pass fromdomain=wdc.com); spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=wdc.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731618AbgGaHAR (ORCPT + 99 others); Fri, 31 Jul 2020 03:00:17 -0400 Received: from esa5.hgst.iphmx.com ([216.71.153.144]:39092 "EHLO esa5.hgst.iphmx.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731572AbgGaG7u (ORCPT ); Fri, 31 Jul 2020 02:59:50 -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=1596178790; x=1627714790; h=from:to:cc:subject:date:message-id:references: content-transfer-encoding:mime-version; bh=9CpsMgBHq9VYBvidyhoQ4MvqAsHK3mqMI8EE8wIrVD0=; b=ScmkLQdvP8Djv9HVTyObwJ4jdYKMHH1GxSJH6Yj/o/RgOo35rGQrQjwk 01LU4eXtaV9+ixBo/tOw/T0TJeqPI6FX1/f0rZVbiqPmW0mdI380Gdd1b uLdUG1C8AiW2o0sQgA3jMu+WHLM4RXgT5QrPDt/P9tiB42YXtP74zLCk4 WjSmabVves7G1XfWb6tBc8YyIBexxWt+aLAE55fJnAW+tv4lU6sUN7Nx1 sPlRQsMoTNLIemwCgmqtHUVeRqCp1COoydqPH5N6zmWTaXwljFGM48+/I oKmw1WbzCHYfCtzw/KXSJ9EW9300mJGl8O6JzXQ6WKXiGctikO7IxS5ss w==; IronPort-SDR: zohnI3JABE59zJCqLsBnOG/sQbDFyXRrXDs3gLkA3dlsEb7L3EljuXQ9khAmW80ZGsrz3fCv99 qIKiY6vxijYojAcH9CZFCyp3DcphWBRq04PGe3VLnvrGqVtpqrBjtKjfxKl4157rW6FAsoC/ER TAqd94vP0Vjln8940EfS2JMP6i4sfDwafoD8kYd6Yqj54TR3v18x4YHHRsQqGKQUxEDoQ3RkEt tH0WterxITJwPMyRTvVdm+3zVwbFNxQGeH+q74ZcFf6zJFbqnnH8bOKellFnkfUw2ApADpA9Xg y/o= X-IronPort-AV: E=Sophos;i="5.75,417,1589212800"; d="scan'208";a="143903671" Received: from mail-sn1nam02lp2056.outbound.protection.outlook.com (HELO NAM02-SN1-obe.outbound.protection.outlook.com) ([104.47.36.56]) by ob1.hgst.iphmx.com with ESMTP; 31 Jul 2020 14:59:48 +0800 ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=dhfdnHFsc/5WssPTscfmlkJJDt9nf1NfJgfOy07HSFiwpLp/f8BGlQZMKZr0MnouTGc3TlovbMNdMFBrhGJRKd5vlraInCBxN9sSUz5Dn1bhBRg0xoxtIL5IPZS3p4CJJlqY6ZdLdDIAd67cyqSdAEqjXFfZKnRH5ArKSUMVtBy9m9gVF9V7ciXpyYcApqVTBq6+O+vpy6Bjcqhh2Jqlp6GQdgjGbK9RwhbaehewvETGbz/YChxBRXma2xFr1DPzRykk77bwtJg4NpNoZTg2YO5BYnLBmFUmGzUNXSn2khpCTViZVWeyiBWh+GaDMNKXcafs+P+5WtAcWkP/9jCRYw== 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=VHofBGPchJ3wPpn3RBb8zlBcgYl7N7un/W9/Wq4tKpg=; b=AdM80lmyWuAF2i7Rw8jWc59GKx2ZjV+b6MKzllQEHkA/ypqotLOAHOZAagNs9mVZVUQVmXM+6Bi/IOQodvrHXgEdW+8nB9/OBrukUwxmGlHi6QFxI8+NhZmDHO9KLObtUjI9qD8p6O/mVGCLBiAcv3YZn97r/x7A4hC5kQCxBWecg4CHdxF/VE8e31hXKPt9Q922MFF3cAe6YQUonphXk0krlDifUgr6yCVde3abeguYE+M85Ewj9V7bhCbZkrqvZ6PzMakfvMW1zC6rqPQbmaP/PKRtqRa9aNXKzNs/Z6X/y35Td7cuCbwU2aQ3CXO4Kju3yw1bMfxO9L0rmfI94Q== 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=VHofBGPchJ3wPpn3RBb8zlBcgYl7N7un/W9/Wq4tKpg=; b=upaN17NRRcedLapmTMQIl5KWqBwfiAYj878rueO2oU7d8Vqb4ekk2Jp1JkIMYgCMyLXR7x2CCAKBjdh5gxBlJ9Bbj1SvrTfIGVberpCRSlXArqgp3RnW8tKr55chDqBY7cNgFlQ3i28EE6AMkO8ELgwMipdPT3UATsWuYt5RM9E= Received: from MWHPR04MB3758.namprd04.prod.outlook.com (2603:10b6:300:fb::8) by MWHPR0401MB3690.namprd04.prod.outlook.com (2603:10b6:301:7c::36) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3216.27; Fri, 31 Jul 2020 06:59:46 +0000 Received: from MWHPR04MB3758.namprd04.prod.outlook.com ([fe80::718a:d477:a4f1:c137]) by MWHPR04MB3758.namprd04.prod.outlook.com ([fe80::718a:d477:a4f1:c137%7]) with mapi id 15.20.3239.017; Fri, 31 Jul 2020 06:59:45 +0000 From: Damien Le Moal To: "hch@infradead.org" CC: Kanchan Joshi , Jens Axboe , Pavel Begunkov , Kanchan Joshi , "viro@zeniv.linux.org.uk" , "bcrl@kvack.org" , Matthew Wilcox , "linux-fsdevel@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "linux-aio@kvack.org" , "io-uring@vger.kernel.org" , "linux-block@vger.kernel.org" , "linux-api@vger.kernel.org" , SelvaKumar S , Nitesh Shetty , Javier Gonzalez Subject: Re: [PATCH v4 6/6] io_uring: add support for zone-append Thread-Topic: [PATCH v4 6/6] io_uring: add support for zone-append Thread-Index: AQHWYdbcc0q15qREKECGO7brHi6zEg== Date: Fri, 31 Jul 2020 06:59:45 +0000 Message-ID: References: <80d27717-080a-1ced-50d5-a3a06cf06cd3@kernel.dk> <65a7e9a6-aede-31ce-705c-b7f94f079112@kernel.dk> <20200731064526.GA25674@infradead.org> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: infradead.org; dkim=none (message not signed) header.d=none;infradead.org; 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: 49c1687e-6dc7-4614-28d7-08d8351f4f03 x-ms-traffictypediagnostic: MWHPR0401MB3690: x-ld-processed: b61c8803-16f3-4c35-9b17-6f65f441df86,ExtAddr x-microsoft-antispam-prvs: wdcipoutbound: EOP-TRUE x-ms-oob-tlc-oobclassifiers: OLM:10000; x-ms-exchange-senderadcheck: 1 x-microsoft-antispam: BCL:0; x-microsoft-antispam-message-info: qWHfSirrLB5R96wjjw0emvqvfwaQo79IxwUPYV6TyRdUDWXJrhTW1xLRlNNmkvoqGs9GFsIs4lDtxYnQqD1+Ht6HRN4v0/7S9dU9oDP/y9TzitZiP/FLGJuptXcsjcPqIXzR2F3KObr6QBZ//XheVjNqrXMzQmN+uY1FqA5Et5CcgEXur8ueHWl93YxiXOqs35aFavmMpohtex1pFLdCReLmr/jJuEMcUigEnUvP879Z7Ev0M/fWvP2OtCdsu6r20Sd13sO90Wr36y4zDYromPZfXXwMCPKPoaxAyMDqACckqun29TflBVGlO9RYr5o16ytNiqiN0V40uEvCn3ZHlQ== x-forefront-antispam-report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:MWHPR04MB3758.namprd04.prod.outlook.com;PTR:;CAT:NONE;SFTY:;SFS:(4636009)(136003)(366004)(39860400002)(376002)(396003)(346002)(316002)(66476007)(9686003)(53546011)(6506007)(64756008)(26005)(5660300002)(186003)(2906002)(33656002)(91956017)(52536014)(76116006)(55016002)(66556008)(66946007)(66446008)(6916009)(54906003)(4326008)(8936002)(83380400001)(8676002)(86362001)(71200400001)(7696005)(7416002)(478600001);DIR:OUT;SFP:1102; x-ms-exchange-antispam-messagedata: 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 x-ms-exchange-transport-forked: True Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: wdc.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: MWHPR04MB3758.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 49c1687e-6dc7-4614-28d7-08d8351f4f03 X-MS-Exchange-CrossTenant-originalarrivaltime: 31 Jul 2020 06:59:45.7471 (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: AvboYHtrLbKs+86+TxmHj1OAmoe5H16sB2Y4gTL81Gq38qACI/xWh0GE6Do0Pc4jOhXPC+5B+BVEca62htty/A== X-MS-Exchange-Transport-CrossTenantHeadersStamped: MWHPR0401MB3690 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 2020/07/31 15:45, hch@infradead.org wrote:=0A= > On Fri, Jul 31, 2020 at 06:42:10AM +0000, Damien Le Moal wrote:=0A= >>> - We may not be able to use RWF_APPEND, and need exposing a new=0A= >>> type/flag (RWF_INDIRECT_OFFSET etc.) user-space. Not sure if this=0A= >>> sounds outrageous, but is it OK to have uring-only flag which can be=0A= >>> combined with RWF_APPEND?=0A= >>=0A= >> Why ? Where is the problem ? O_APPEND/RWF_APPEND is currently meaningles= s for=0A= >> raw block device accesses. We could certainly define a meaning for these= in the=0A= >> context of zoned block devices.=0A= > =0A= > We can't just add a meaning for O_APPEND on block devices now,=0A= > as it was previously silently ignored. I also really don't think any=0A= > of these semantics even fit the block device to start with. If you=0A= > want to work on raw zones use zonefs, that's what is exists for.=0A= =0A= Which is fine with me. Just trying to say that I think this is exactly the= =0A= discussion we need to start with. What interface do we implement...=0A= =0A= Allowing zone append only through zonefs as the raw block device equivalent= , all=0A= the O_APPEND/RWF_APPEND semantic is defined and the "return written offset"= =0A= implementation in VFS would be common for all file systems, including regul= ar=0A= ones. Beside that, there is I think the question of short writes... Not sur= e if=0A= short writes can currently happen with async RWF_APPEND writes to regular f= iles.=0A= I think not but that may depend on the FS.=0A= =0A= =0A= -- =0A= Damien Le Moal=0A= Western Digital Research=0A=