Return-Path: linux-nfs-owner@vger.kernel.org Received: from mx11.netapp.com ([216.240.18.76]:3915 "EHLO mx11.netapp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756180Ab3I3Te3 (ORCPT ); Mon, 30 Sep 2013 15:34:29 -0400 From: "Myklebust, Trond" To: Bernd Schubert CC: Miklos Szeredi , Ric Wheeler , "J. Bruce Fields" , Zach Brown , "Anna Schumaker" , Kernel Mailing List , Linux-Fsdevel , "linux-nfs@vger.kernel.org" , "Schumaker, Bryan" , "Martin K. Petersen" , Jens Axboe , Mark Fasheh , Joel Becker , Eric Wong Subject: Re: [RFC] extending splice for copy offloading Date: Mon, 30 Sep 2013 19:34:26 +0000 Message-ID: <1380569663.6501.63.camel@leira.trondhjem.org> References: <20130930143432.GG16579@fieldses.org> <52499026.3090802@redhat.com> <52498AA8.2090204@redhat.com> <52498DB6.7060901@redhat.com> <52498F68.8050200@redhat.com> <20130930163159.GA14242@tucsk.piliscsaba.szeredi.hu> <5249B21E.70603@itwm.fraunhofer.de> <1380563050.6501.15.camel@leira.trondhjem.org> <5249B987.8020807@itwm.fraunhofer.de> <1380564126.6501.23.camel@leira.trondhjem.org> <5249C7C7.7020207@itwm.fraunhofer.de> In-Reply-To: <5249C7C7.7020207@itwm.fraunhofer.de> Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Sender: linux-nfs-owner@vger.kernel.org List-ID: T24gTW9uLCAyMDEzLTA5LTMwIGF0IDIwOjQ5ICswMjAwLCBCZXJuZCBTY2h1YmVydCB3cm90ZToN Cj4gT24gMDkvMzAvMjAxMyAwODowMiBQTSwgTXlrbGVidXN0LCBUcm9uZCB3cm90ZToNCj4gPiBP biBNb24sIDIwMTMtMDktMzAgYXQgMTk6NDggKzAyMDAsIEJlcm5kIFNjaHViZXJ0IHdyb3RlOg0K PiA+PiBPbiAwOS8zMC8yMDEzIDA3OjQ0IFBNLCBNeWtsZWJ1c3QsIFRyb25kIHdyb3RlOg0KPiA+ Pj4gT24gTW9uLCAyMDEzLTA5LTMwIGF0IDE5OjE3ICswMjAwLCBCZXJuZCBTY2h1YmVydCB3cm90 ZToNCj4gPj4+PiBJdCB3b3VsZCBiZSBuaWNlIGlmIHRoZXJlIHdvdWxkIGJlIHdheSBpZiB0aGUg ZmlsZSBzeXN0ZW0gd291bGQgZ2V0IGENCj4gPj4+PiBoaW50IHRoYXQgdGhlIHRhcmdldCBmaWxl IGlzIHN1cHBvc2VkIHRvIGJlIGNvcHkgb2YgYW5vdGhlciBmaWxlLiBUaGF0DQo+ID4+Pj4gd2F5 IGRpc3RyaWJ1dGVkIGZpbGUgc3lzdGVtcyBjb3VsZCBhbHNvIGNyZWF0ZSB0aGUgdGFyZ2V0LWZp bGUgd2l0aCB0aGUNCj4gPj4+PiBjb3JyZWN0IG1ldGEtaW5mb3JtYXRpb24gKHNhbWUgc3RvcmFn ZSB0YXJnZXRzIGFzIGluLWZpbGUgaGFzKS4NCj4gPj4+PiBXZWxsLCBpZiB3ZSBjYW5ub3QgYWdy ZWUgb24gdGhhdCwgZmlsZSBzeXN0ZW0gd2l0aCBhIGN1c3RvbSBwcm90b2NvbCBhdA0KPiA+Pj4+ IGxlYXN0IGNhbiBkZXRlY3QgZnJvbSAwIHRvIFNTSVpFX01BWCBhbmQgdGhlbiByZXNldCBtZXRh ZGF0YS4gSSdtIG5vdA0KPiA+Pj4+IHN1cmUgaWYgdGhpcyB3b3VsZCB3b3JrIGZvciBwTkZTLCB0 aG91Z2guDQo+ID4+Pg0KPiA+Pj4gc3BsaWNlKCkgZG9lcyBub3QgY3JlYXRlIG5ldyBmaWxlcy4g V2hhdCB5b3UgYXBwZWFyIHRvIGJlIGFza2luZyBmb3INCj4gPj4+IGxpZXMgd2F5IG91dHNpZGUg dGhlIHNjb3BlIG9mIHRoYXQgc3lzdGVtIGNhbGwgaW50ZXJmYWNlLg0KPiA+Pj4NCj4gPj4NCj4g Pj4gU29ycnkgSSBrbm93LCBkZWZpbml0ZWx5IG91dHNpZGUgdGhlIHNjb3BlIG9mIHNwbGljZSwg YnV0IGluIHRoZSBjb250ZXh0DQo+ID4+IG9mIG9mZmxvYWRlZCBmaWxlIGNvcGllcy4gU28gdGhl IHF1ZXN0aW9uIGlzLCB3aGF0IGlzIHRoZSBiZXN0IHdheSB0bw0KPiA+PiBhZGRyZXNzL2Rpc2N1 c3MgdGhhdD8NCj4gPg0KPiA+IFdoeSBkb2VzIGl0IG5lZWQgdG8gYmUgYWRkcmVzc2VkIGluIHRo ZSBmaXJzdCBwbGFjZT8NCj4gDQo+IEFuIG9mZmxvYWRlZCBjb3B5IGlzIHN0aWxsIG5vdCBlZmZp Y2llbnQgaWYgZGlmZmVyZW50IHN0b3JhZ2UgDQo+IHNlcnZlcnMvdGFyZ2V0cyB1c2VkIGJ5IGZy b20tZmlsZSBhbmQgdG8tZmlsZS4NCg0KU28/IA0KDQo+ID4NCj4gPiBXaGF0IGlzIHByZXZlbnRp bmcgYW4gYXBwbGljYXRpb24gZnJvbSByZXRyaWV2aW5nIGFuZCBzZXR0aW5nIHRoaXMNCj4gPiBp bmZvcm1hdGlvbiB1c2luZyBzdGFuZGFyZCBsaWJjIGZ1bmN0aW9ucyBzdWNoIGFzIGZzdGF0KCkr b3BlbigpLCBhbmQNCj4gPiBzdXBwbGVtZW50ZWQgd2l0aCBsaWJhdHRyIGF0dHJfc2V0Zi9nZXRm KCksIGFuZCBsaWJhY2wgYWNsX2dldF9mZC9zZXRfZmQNCj4gPiB3aGVyZSBhcHByb3ByaWF0ZT8N Cj4gPg0KPiANCj4gQXQgYSBtaW5pbXVtIHRoaXMgcmVxdWlyZXMgbmV0d29yayBhbmQgbWV0YWRh dGEgb3ZlcmhlYWQuIEFuZCB3aGlsZSBJJ20gDQo+IHdvcmtpbmcgb24gRmhHRlMgbm93LCBJIHN0 aWxsIHdvbmRlciB3aGF0IG90aGVyIGZpbGUgc3lzdGVtIG5lZWQgdG8gZG8gLSANCj4gZm9yIGV4 YW1wbGUgTHVzdHJlIHByZS1hbGxvY2F0ZXMgc3RvcmFnZS10YXJnZXQgZmlsZXMgb24gY3JlYXRp bmcgYSANCj4gZmlsZSwgc28gZmlsZSBsYXlvdXQgY2hhbmdlcyBtZWFuIGV2ZW4gbW9yZSBvdmVy aGVhZCB0aGVyZS4NCg0KVGhlIHByb2JsZW0geW91IGFyZSBkZXNjcmliaW5nIGlzIGxpbWl0ZWQg dG8gYSBuYXJyb3cgc2V0IG9mIHN0b3JhZ2UNCmFyY2hpdGVjdHVyZXMuIElmIGNvcHkgb2ZmbG9h ZCB1c2luZyBzcGxpY2UoKSBkb2Vzbid0IG1ha2Ugc2Vuc2UgZm9yDQp0aG9zZSBhcmNoaXRlY3R1 cmVzLCB0aGVuIGRvbid0IGltcGxlbWVudCBpdCBmb3IgdGhlbS4NCllvdSBtaWdodCBiZSBhYmxl IHRvIHByb3ZpZGUgaW9jdGxzKCkgdG8gZG8gdGhlc2Ugc3BlY2lhbCBoaW50ZWQgZmlsZQ0KY3Jl YXRpb25zIGZvciB0aG9zZSBmaWxlc3lzdGVtcyB0aGF0IG5lZWQgaXQsIGJ1dCB0aGUgdmFzdCBt YWpvcml0eQ0KZG9uJ3QsIGFuZCB5b3Ugc2hvdWxkbid0IGVuZm9yY2UgaXQgb24gdGhlbS4NCg0K PiBBbnl3YXksIGlmIHdlIGNvdWxkIGFncmVlIG9uIHRvIHVzZSBsaWJhdHRyIG9yIGxpYmFjbCB0 byB0ZWFjaCB0aGUgZmlsZSANCj4gc3lzdGVtIGFib3V0IHRoZSB1cGNvbWluZyBzcGxpY2UgY2Fs bCBJIHdvdWxkIGJlIGZpbmUuDQoNCmxpYmF0dHIgYW5kIGxpYmFjbCBhcmUgZ2VuZXJpYyBsaWJy YXJpZXMgdGhhdCBleGlzdCB0byBtYW5pcHVsYXRlIHhhdHRycw0KYW5kIGFjbHMuIFRoZXkgZG8g bm90IG5lZWQgdG8gY29udGFpbiBMdXN0cmUtc3BlY2lmaWMgY29kZS4NCg0KLS0gDQpUcm9uZCBN eWtsZWJ1c3QNCkxpbnV4IE5GUyBjbGllbnQgbWFpbnRhaW5lcg0KDQpOZXRBcHANClRyb25kLk15 a2xlYnVzdEBuZXRhcHAuY29tDQp3d3cubmV0YXBwLmNvbQ0K