From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from g9t1613g.houston.hpe.com ([15.241.32.99]:20517 "EHLO g9t1613g.houston.hpe.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727067AbeH2Cci (ORCPT ); Tue, 28 Aug 2018 22:32:38 -0400 Received: from g9t5009.houston.hpe.com (g9t5009.houston.hpe.com [15.241.48.73]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by g9t1613g.houston.hpe.com (Postfix) with ESMTPS id 6EFC960EBA for ; Tue, 28 Aug 2018 22:38:51 +0000 (UTC) From: "Kani, Toshi" To: "jack@suse.cz" , "snitzer@redhat.com" CC: "dm-devel@redhat.com" , "ross.zwisler@linux.intel.com" , "linux-nvdimm@lists.01.org" , "dan.j.williams@intel.com" , "linux-fsdevel@vger.kernel.org" Subject: Re: Snapshot target and DAX-capable devices Date: Tue, 28 Aug 2018 22:38:47 +0000 Message-ID: References: <20180827160744.GE4002@quack2.suse.cz> <20180828075025.GA17756@quack2.suse.cz> <20180828175630.GA1197@redhat.com> In-Reply-To: <20180828175630.GA1197@redhat.com> Content-Language: en-US Content-Type: text/plain; charset="utf-8" Content-ID: <323FBE92C6EB0847844574BEB3CDD79E@NAMPRD84.PROD.OUTLOOK.COM> Content-Transfer-Encoding: base64 MIME-Version: 1.0 Sender: linux-fsdevel-owner@vger.kernel.org List-ID: T24gVHVlLCAyMDE4LTA4LTI4IGF0IDEzOjU2IC0wNDAwLCBNaWtlIFNuaXR6ZXIgd3JvdGU6DQo+ IE9uIFR1ZSwgQXVnIDI4IDIwMTggYXQgIDM6NTBhbSAtMDQwMCwNCj4gSmFuIEthcmEgPGphY2tA c3VzZS5jej4gd3JvdGU6DQo+IA0KPiA+IE9uIE1vbiAyNy0wOC0xOCAxNjo0MzoyOCwgS2FuaSwg VG9zaGkgd3JvdGU6DQo+ID4gPiBPbiBNb24sIDIwMTgtMDgtMjcgYXQgMTg6MDcgKzAyMDAsIEph biBLYXJhIHdyb3RlOg0KPiA+ID4gPiBIaSwNCj4gPiA+ID4gDQo+ID4gPiA+IEkndmUgYmVlbiBh bmFseXppbmcgd2h5IGZzdGVzdCBnZW5lcmljLzA4MSBmYWlscyB3aGVuIHRoZSBiYWNraW5nIGRl dmljZSBpcw0KPiA+ID4gPiBjYXBhYmxlIG9mIERBWC4gVGhlIHByb2JsZW0gYm9pbHMgZG93biB0 byB0aGUgZmFpbHVyZSBvZjoNCj4gPiA+ID4gDQo+ID4gPiA+IGx2bSB2Z2NyZWF0ZSAtZiB2ZzAg L2Rldi9wbWVtMA0KPiA+ID4gPiBsdm0gbHZjcmVhdGUgLUwgMTI4TSAtbiBsdjAgdmcwDQo+ID4g PiA+IGx2bSBsdmNyZWF0ZSAtcyAtTCA0TSAtbiBzbmFwMCB2ZzAvbHYwDQo+ID4gPiA+IA0KPiA+ ID4gPiBUaGUgbGFzdCBjb21tYW5kIGZhaWxzIGxpa2U6DQo+ID4gPiA+IA0KPiA+ID4gPiAgIGRl dmljZS1tYXBwZXI6IHJlbG9hZCBpb2N0bCBvbiAoMjUzOjApIGZhaWxlZDogSW52YWxpZCBhcmd1 bWVudA0KPiA+ID4gPiAgIEZhaWxlZCB0byBsb2NrIGxvZ2ljYWwgdm9sdW1lIHZnMC9sdjAuDQo+ ID4gPiA+ICAgQWJvcnRpbmcuIE1hbnVhbCBpbnRlcnZlbnRpb24gcmVxdWlyZWQuDQo+ID4gPiA+ IA0KPiA+ID4gPiBBbmQgdGhlIGNvcmUgb2YgdGhlIHByb2JsZW0gaXMgdGhhdCB2b2x1bWUgdmcw L2x2MCBpcyBvcmlnaW5hbGx5IG9mDQo+ID4gPiA+IERNX1RZUEVfREFYX0JJT19CQVNFRCB0eXBl IGJ1dCB3aGVuIHRoZSBzbmFwc2hvdCBnZXRzIGNyZWF0ZWQsIHdlIHRyeSB0bw0KPiA+ID4gPiBz d2l0Y2ggaXQgdG8gRE1fVFlQRV9CSU9fQkFTRUQgYmVjYXVzZSBub3cgdGhlIGRldmljZSBzdG9w cyBzdXBwb3J0aW5nIERBWC4NCj4gPiA+ID4gVGhlIHByb2JsZW0gc2VlbXMgdG8gYmUgaW50cm9k dWNlZCBieSBSb3NzJyBjb21taXQgZGJjNjI2NTk3ICJkbTogcHJldmVudA0KPiA+ID4gPiBEQVgg bW91bnRzIGlmIG5vdCBzdXBwb3J0ZWQiLg0KPiA+ID4gPiANCj4gPiA+ID4gVGhlIHF1ZXN0aW9u IGlzIHdoZXRoZXIgLyBob3cgdGhpcyBzaG91bGQgYmUgZml4ZWQuIFRoZSBjdXJyZW50IGluYWJp bGl0eQ0KPiA+ID4gPiB0byBjcmVhdGUgc25hcHNob3RzIG9mIERBWC1jYXBhYmxlIGRldmljZXMg bG9va3Mgd2VpcmQgYW5kIHRoZSBjcnlwdGljDQo+ID4gPiA+IGZhaWx1cmUgbWFrZXMgaXQgZXZl biB3b3JzZSAoaXQgdG9vayBtZSBxdWl0ZSBhIHdoaWxlIHRvIHVuZGVyc3RhbmQgd2hhdCBpcw0K PiA+ID4gPiBmYWlsaW5nIGFuZCB3aHkpLiBPVE9IIEkgc2VlIHRoZSByYXRpb25hbGUgYmVoaW5k IFJvc3MnIGNoYW5nZSBhcyB3ZWxsLg0KPiA+ID4gDQo+ID4gPiBIZXJlIGFyZSB0aGUgZG0tc25h cCBjaGFuZ2VzIHRoYXQgd2VudCBhbG9uZyB3aXRoIHRoZSBvcmlnaW5hbCBEQVgNCj4gPiA+IHN1 cHBvcnQuDQo+ID4gPiANCj4gPiA+IGNvbW1pdCBiNWFiNGE5YmE1NQ0KPiA+ID4gY29tbWl0IGY2 ZTYyOWJkMjM3DQo+ID4gPiANCj4gPiA+IEJhc2ljYWxseSwgc25hcHNob3RzIGNhbiBiZSBhZGRl ZC9yZW1vdmVkIHRvIERBWC1jYXBhYmxlIGRldmljZXMsIGJ1dA0KPiA+ID4gc25hcHNob3RzIG5l ZWQgdG8gYmUgbW91bnRlZCB3aXRob3V0IGRheCBvcHRpb24uDQo+ID4gDQo+ID4gWWVzLCBhbmQg YWZ0ZXIgdGhlc2UgdHdvIGNvbW1pdHMgdGhpbmdzIHdlcmUgd29ya2luZy4gQnV0IHRoZW4gY29t bWl0DQo+ID4gZGJjNjI2NTk3IGJyb2tlIHRoaW5ncyBhZ2FpbiBzbyBjdXJyZW50bHkgc25hcHNo b3R0aW5nIERBWC1jYXBhYmxlIGRldmljZXMNCj4gPiBkb2VzIG5vdCB3b3JrLiBKdXN0IHRyeSB3 aXRoIDQuMTguLi4NCj4gDQo+IENvbW1pdCBmNmU2MjliZDIzNyB3YXMgYSBuYXN0eSBoYWNrLCBh bmQgY29tbWl0IGRiYzYyNjU5NyBleHBvc2VkIGl0IGFzDQo+IHN1Y2guICBCdXQgY29tbWl0IGRi YzYyNjU5NyBoYXMgY2F1c2VkIHVzIHRvIHJlZ3Jlc3MuLiBzbyB3ZSBuZWVkIHRvIGZpeA0KPiBp dC4NCj4gDQo+IFdlIGNvdWxkIHJlbW92ZSBETV9UWVBFX0RBWF9CSU9fQkFTRUQgY29tcGxldGVs eS4gIEJ1dCBpbiB0aGUgcGFzdCBJIHdhcw0KPiByZWx1Y3RhbnQgdG8gZG8gc28gYmVjYXVzZSBp dCByZWFsbHkgaXMgdW5jbGVhciBob3cvaWYgd2UgY2FuIGV2ZW4NCj4gc3VwcG9ydCBhIGRldmlj ZSBzd2l0Y2hpbmcgZnJvbSBEQVggdG8gbm9uLURBWCB3aGlsZSBJTyBpcyBpbi1mbGlnaHQuIERN DQo+IHN1cHBvcnRzIHN1c3BlbmRpbmcgd2l0aG91dCBmbHVzaGluZyAodmlhIGRtc2V0dXAgc3Vz cGVuZCAtLW5vZmx1c2gpIGFuZA0KPiB0aGF0IGNvdWxkIHJlYWxseSBiZSBwcm9ibGVtYXRpYyBp ZiB3ZSBsZWF2ZSBEQVggSU8gaW5mbGlnaHQgYW5kIHRoZW4NCj4gc3dpdGNoIHRoZSBETSB0YWJs ZSBzdWNoIHRoYXQgdGhlIERNIGRldmljZSBubyBsb25nZXIgc3VwcG9ydHMgREFYLg0KPiANCj4g SSdtIG9wZW4gdG8gc3VnZ2VzdGlvbnMuDQoNClJpZ2h0LCBjb21taXQgZjZlNjI5YmQyMzcgaXMg YSBoYWNrLCBidXQgSSBkbyBub3QgaGF2ZSBhIGJldHRlciBpZGVhIGF0DQp0aGlzIHBvaW50Li4u ICBGb3Igbm93LCBJIGFtIGFmcmFpZCB0aGF0IHJldmVydGluZyBjb21taXQgZGJjNjI2NTk3IG1h eQ0KYmUgYW4gb3B0aW9uLg0KDQpUaGFua3MsDQotVG9zaGkNCg0K