Return-Path: Received: from us-smtp-delivery-194.mimecast.com ([63.128.21.194]:32010 "EHLO us-smtp-delivery-194.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750773AbdBOPAz (ORCPT ); Wed, 15 Feb 2017 10:00:55 -0500 From: Trond Myklebust To: "kinglongmee@gmail.com" , "Jorge.Mora@netapp.com" , "linux-nfs@vger.kernel.org" Subject: Re: Question about NFSv4.2 server-side copy implementation Date: Wed, 15 Feb 2017 15:00:43 +0000 Message-ID: <1487170840.3039.1.camel@primarydata.com> References: In-Reply-To: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: linux-nfs-owner@vger.kernel.org List-ID: T24gV2VkLCAyMDE3LTAyLTE1IGF0IDE4OjM2ICswODAwLCBLaW5nbG9uZyBNZWUgd3JvdGU6DQo+ IE9uIDIvMTUvMjAxNyAwNDowNywgTW9yYSwgSm9yZ2Ugd3JvdGU6DQo+ID4gSGVsbG8sDQo+ID4g wqANCj4gPiBUaGUgTkZTdjQuMiBzcGVjIChSRkMgNzg2Mikgb24gc2VjdGlvbiAxNS4yLjMgKENP UFkgZGVzY3JpcHRpb24pDQo+ID4gc2F5cyB0aGUgZm9sbG93aW5nOg0KPiA+IMKgDQo+ID4gSWYg dGhlIHNvdXJjZSBvZmZzZXQgb3IgdGhlIHNvdXJjZSBvZmZzZXQgcGx1cyBjb3VudCBpcyBncmVh dGVyDQo+ID4gdGhhbg0KPiA+IHRoZSBzaXplIG9mIHRoZSBzb3VyY2UgZmlsZSwgdGhlIG9wZXJh dGlvbiBNVVNUIGZhaWwgd2l0aA0KPiA+IE5GUzRFUlJfSU5WQUwuDQo+ID4gwqANCj4gPiBJIGNh biB1bmRlcnN0YW5kIGZhaWxpbmcgd2l0aCBORlM0RVJSX0lOVkFMIHdoZW4gdGhlIHNvdXJjZSBv ZmZzZXQNCj4gPiBpcyBiZXlvbmQgdGhlIGVuZCBvZiB0aGUgZmlsZSwNCj4gDQo+IFllcywgdGhh dCdzIHJpZ2h0Lg0KPiANCj4gPiBidXQgZG8geW91IHRoaW5rIGZhaWxpbmcgd2l0aCBORlM0RVJS X0lOVkFMIGlzIHRvbyBzdHJpY3Qgd2hlbiB0aGUNCj4gPiBzb3VyY2Ugb2Zmc2V0IHBsdXMgdGhl IGNvdW50IGlzIGJleW9uZCB0aGUgZW5kIG9mIHRoZSBmaWxlPw0KPiA+IFdoYXQgaXMgdGhlIHJh dGlvbmFsaXphdGlvbiBmb3IgZmFpbGluZyBvbiB0aGlzIHNwZWNpZmljIGluc3RhbmNlPw0KPiA+ IFdoeSBub3QgcmV0dXJuIGEgc2hvcnQgY29weSBpbnN0ZWFkPw0KPiANCj4gVGhlIG1hbi1wYWdl cyBvZiBjb3B5X2ZpbGVfcmFuZ2UgZGVzY3JpcHRpb24gYXMsDQo+IA0KPiDCoMKgwqDCoMKgwqDC oEVJTlZBTCBSZXF1ZXN0ZWQgcmFuZ2UgZXh0ZW5kcyBiZXlvbmQgdGhlIGVuZCBvZg0KPiB0aGXC oMKgc291cmNlwqDCoGZpbGU7wqDCoG9yDQo+IMKgwqDCoMKgwqDCoMKgwqDCoMKgwqDCoMKgwqB0 aGUgZmxhZ3MgYXJndW1lbnQgaXMgbm90IDAuDQo+IA0KPiBTbywgdGhlIHNwZWNpZmljIGluc3Rh bmNlIHlvdSBzYWlkIGlzbid0IGFsbG93ZWQuDQo+IA0KPiA+IENhbiB0aGUgQ09QWSByZXR1cm4g YSBjb3VudCBsZXNzIHRoYW4gd2hhdCBpdCByZXF1ZXN0ZWQgKGEgc2hvcnQNCj4gPiBjb3B5KT8N Cj4gDQo+IFllcywgdGhlIHJldHVybiB2YWx1ZSBvZiBjb3B5X2ZpbGVfcmFuZ2UgaXMsDQo+IA0K PiBSRVRVUk4gVkFMVUUNCj4gwqDCoMKgwqDCoMKgwqBVcG9uIHN1Y2Nlc3NmdWwgY29tcGxldGlv biwgY29weV9maWxlX3JhbmdlKCkgd2lsbCByZXR1cm4gdGhlDQo+IG51bWJlciBvZg0KPiDCoMKg wqDCoMKgwqDCoGJ5dGVzIGNvcGllZCBiZXR3ZWVuIGZpbGVzLsKgwqBUaGlzIGNvdWxkIGJlIGxl c3MgdGhhbiB0aGUNCj4gbGVuZ3RowqDCoG9yaWdp4oCQDQo+IMKgwqDCoMKgwqDCoMKgbmFsbHkg cmVxdWVzdGVkLg0KPiANCg0KSXQncyBhIHZhbGlkIHF1ZXN0aW9uLCB0aG91Z2guIE5vdCBsZWFz dCBiZWNhdXNlIGNvcHlfZmlsZV9yYW5nZSgpIGlzDQpub3QgZ3VhcmFudGVlZCB0byBiZSBhdG9t aWMsIG1lYW5pbmcgdGhhdCB5b3UgY291bGQgaGF2ZSByYWNlcyB3aGVyZQ0KdGhlIGV4ZWN1dGlv biBvZiB0aGUgY29weV9maWxlX3JhbmdlKCkgaXMgc3RhcnRlZCwgYnV0IHRoZSBmaWxlIGlzDQp0 cnVuY2F0ZWQgd2hlbiB0aGUgY29weSBpcyBvbmx5IGhhbGYtY29tcGxldGUuDQoNCkpvcmdlLCBJ IHN1Z2dlc3QgcmFpc2luZyB0aGUgcXVlc3Rpb24gb24gdGhlIElFVEYgbWFpbGluZyBsaXN0LiBU aGlzDQptaWdodCBiZSBhIGNhbmRpZGF0ZSBmb3IgYSBORlN2NC4yIHByb3RvY29sIGVycmF0YS4N Cg0KQ2hlZXJzDQogIFRyb25kDQotLSANClRyb25kIE15a2xlYnVzdA0KTGludXggTkZTIGNsaWVu dCBtYWludGFpbmVyLCBQcmltYXJ5RGF0YQ0KdHJvbmQubXlrbGVidXN0QHByaW1hcnlkYXRhLmNv bQ0K