From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-0.8 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 38AF2C76186 for ; Wed, 17 Jul 2019 09:05:56 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id E36F82077C for ; Wed, 17 Jul 2019 09:05:55 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=fujitsu.onmicrosoft.com header.i=@fujitsu.onmicrosoft.com header.b="QvZRuUxN" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727743AbfGQJFy (ORCPT ); Wed, 17 Jul 2019 05:05:54 -0400 Received: from esa12.fujitsucc.c3s2.iphmx.com ([216.71.156.125]:64174 "EHLO esa12.fujitsucc.c3s2.iphmx.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725932AbfGQJFy (ORCPT ); Wed, 17 Jul 2019 05:05:54 -0400 X-Greylist: delayed 428 seconds by postgrey-1.27 at vger.kernel.org; Wed, 17 Jul 2019 05:05:52 EDT X-IronPort-AV: E=McAfee;i="6000,8403,9320"; a="5037846" X-IronPort-AV: E=Sophos;i="5.64,273,1559487600"; d="scan'208";a="5037846" Received: from mail-ty1jpn01lp2054.outbound.protection.outlook.com (HELO JPN01-TY1-obe.outbound.protection.outlook.com) ([104.47.93.54]) by ob1.fujitsucc.c3s2.iphmx.com with ESMTP/TLS/AES256-SHA256; 17 Jul 2019 17:58:42 +0900 ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=BMrGZygE7T/uFxnM3MZYmnj+iQsCXl8mFCeyrw+B7hrrAO3P8UoPhSjX90ymu7hBcOZP04S3gE4EZLamRdbHMLfocf+VvHPYOVZYfR+T52n61XunDboigT1xxDUvL3P/wxL+BZWzbu+ELDa/0pTASjk/KX9dBurLFcy8qUUHbd/XL2j0sZMXEPADSlffr5aBsjlMqfK3kJ5q5n4JVwy1LbIe8R5mC3kZ255AAOVDc3Q3tJ2YfvSS0W9raDxsUPxW477CWXvJfHcq7qrm4onKZ3gPhM2dSxDG6ezpC3oU7qLuYYJ5okGOXV46VFZOx86tTbb3ZsHmxkwXC7yWzVYXbA== 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=Gx2QFVxIJkAlNjRy/KN9iLGGJtuNyXcjsDzp7RmVprU=; b=RTmlgDTYvv0KbmUZ5M4vmp2HJzXU92ssYWZWTK4SZjJ4KiY02D/di4h9RtK5nZFgsiNHVILDPZ+aJZca2+H8B/mb460yW9My19WSYCgB2OPiO1mQ/zMzCiLGFueRscWKDgO/BR5IpRhrUFGoRtJjd31S9ldDc5gHSG+8y8FNShM7O3tynNSfUhnGZsVTslGvf9XQcrKYQT+XiTffXoMb2l4uw0gns8f8xsbnZjjJ0DYvIs1eOnriP2h0SUZZvOqIfkjcfyU1dvpAgRyl4kbDqUOlHPih8XaSPG1HII/nrMdpGpQfZaeKT2qKr6/DLcy0DN0x+SPMI3zd6y+RuJQPGA== ARC-Authentication-Results: i=1; mx.microsoft.com 1;spf=pass smtp.mailfrom=fujitsu.com;dmarc=pass action=none header.from=fujitsu.com;dkim=pass header.d=fujitsu.com;arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=fujitsu.onmicrosoft.com; s=selector2-fujitsu-onmicrosoft-com; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=Gx2QFVxIJkAlNjRy/KN9iLGGJtuNyXcjsDzp7RmVprU=; b=QvZRuUxNqeasq2eTb4E5861lFuJf0gjMMmnaHVMQFGjGsPjsN/sinibePMYAgDyhr9bvuacy7usp83CBtEu+stGsl6cBiDMwj67phJMJ3rUbwqZkLsIXgJBFnBiViEwfE9lV3QONlUCmTKJDrrJopSTZSuly8oAKRMQyBVKhric= Received: from TYAPR01MB3360.jpnprd01.prod.outlook.com (20.178.136.139) by TYAPR01MB2813.jpnprd01.prod.outlook.com (20.177.104.14) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.2073.10; Wed, 17 Jul 2019 08:58:39 +0000 Received: from TYAPR01MB3360.jpnprd01.prod.outlook.com ([fe80::20e1:b513:392e:a434]) by TYAPR01MB3360.jpnprd01.prod.outlook.com ([fe80::20e1:b513:392e:a434%7]) with mapi id 15.20.2073.015; Wed, 17 Jul 2019 08:58:39 +0000 From: "misono.tomohiro@fujitsu.com" To: 'Hans van Kranenburg' , "linux-btrfs@vger.kernel.org" , Ulli Horlacher Subject: RE: how do I know a subvolume is a snapshot? Thread-Topic: how do I know a subvolume is a snapshot? Thread-Index: AQHVPC3JZtmICxXfsky3dqj1ADsOS6bOeZaAgAAI5dA= Date: Wed, 17 Jul 2019 08:57:31 +0000 Deferred-Delivery: Wed, 17 Jul 2019 08:58:31 +0000 Message-ID: References: <20190716232456.GA26411@tik.uni-stuttgart.de> In-Reply-To: Accept-Language: ja-JP, en-US Content-Language: ja-JP X-MS-Has-Attach: X-MS-TNEF-Correlator: x-shieldmailcheckerpolicyversion: FJ-ISEC-20181130-VDI-enc x-shieldmailcheckermailid: c44e0a2da1904986abc0027056c08975 x-securitypolicycheck: OK by SHieldMailChecker v2.6.2 authentication-results: spf=none (sender IP is ) smtp.mailfrom=misono.tomohiro@fujitsu.com; x-originating-ip: [180.43.156.29] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: f70b8936-13c0-45dd-b63a-08d70a94f608 x-microsoft-antispam: BCL:0;PCL:0;RULEID:(2390118)(7020095)(4652040)(8989299)(4534185)(4627221)(201703031133081)(201702281549075)(8990200)(5600148)(711020)(4605104)(1401327)(2017052603328)(7193020);SRVR:TYAPR01MB2813; x-ms-traffictypediagnostic: TYAPR01MB2813: x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:1923; x-forefront-prvs: 01018CB5B3 x-forefront-antispam-report: SFV:NSPM;SFS:(10009020)(979002)(4636009)(366004)(39860400002)(376002)(346002)(396003)(136003)(199004)(13464003)(189003)(476003)(11346002)(486006)(446003)(33656002)(52536014)(86362001)(6506007)(229853002)(66066001)(76116006)(66446008)(6116002)(66476007)(6436002)(66946007)(85182001)(3846002)(5660300002)(110136005)(256004)(316002)(478600001)(71190400001)(71200400001)(53936002)(2501003)(102836004)(6666004)(64756008)(66556008)(14454004)(8936002)(55016002)(9686003)(6246003)(2906002)(25786009)(186003)(99286004)(7696005)(7736002)(76176011)(74316002)(305945005)(68736007)(53546011)(81156014)(8676002)(81166006)(26005)(777600001)(969003)(989001)(999001)(1009001)(1019001);DIR:OUT;SFP:1101;SCL:1;SRVR:TYAPR01MB2813;H:TYAPR01MB3360.jpnprd01.prod.outlook.com;FPR:;SPF:None;LANG:en;PTR:InfoNoRecords;A:1;MX:1; x-ms-exchange-senderadcheck: 1 x-microsoft-antispam-message-info: MtXbQSkYDOdU66iOa9ojd45AAXGrqs+y1m0gHBmPDlM8F/X1OKGWkOWguM7VPhXDWhEoN+WR2bzM3bb1pghb6HGnTkJr0Twk9KUh0LIEdUITwJdUIbai1GPllpnKP6azdk1ByRT722nTY1sfZageyGKTw7yvhyezKYu75JrpQc166fBOgjmKV856H0WFnkfXCAUNNrRj6ktOauYznEPCNdYGdaZZ3+dbIdfveExRwJ4WQH9wSSqUflS005mU5KBb+KgYZP3Och5Ex8hC2ZM/E53RLTld4TcLpTWUc4F8PyCzNlDIqt6Gid49m1gdD/dCrjW8R6AXIz1BlbGHoT0NJv7s8Xxq3HBv5ribW0FdMVNrNqn0F33meoobD9mY7nG7SG5D1duVatZ+sYJSGXfdaw5J66x3X63xXpvGJcBfK7Y= Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 MIME-Version: 1.0 X-OriginatorOrg: fujitsu.com X-MS-Exchange-CrossTenant-Network-Message-Id: f70b8936-13c0-45dd-b63a-08d70a94f608 X-MS-Exchange-CrossTenant-originalarrivaltime: 17 Jul 2019 08:58:39.4298 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: a19f121d-81e1-4858-a9d8-736e267fd4c7 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: misono.tomohiro@jp.fujitsu.com X-MS-Exchange-Transport-CrossTenantHeadersStamped: TYAPR01MB2813 Sender: linux-btrfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org PiAtLS0tLU9yaWdpbmFsIE1lc3NhZ2UtLS0tLQ0KPiBGcm9tOiBsaW51eC1idHJmcy1vd25lckB2 Z2VyLmtlcm5lbC5vcmcgW21haWx0bzpsaW51eC1idHJmcy1vd25lckB2Z2VyLmtlcm5lbC5vcmdd IE9uIEJlaGFsZiBPZiBIYW5zIHZhbiBLcmFuZW5idXJnDQo+IFNlbnQ6IFdlZG5lc2RheSwgSnVs eSAxNywgMjAxOSA1OjI0IFBNDQo+IFRvOiBsaW51eC1idHJmc0B2Z2VyLmtlcm5lbC5vcmc7IFVs bGkgSG9ybGFjaGVyIDxmcmFtc3RhZ0BydXMudW5pLXN0dXR0Z2FydC5kZT4NCj4gU3ViamVjdDog UmU6IGhvdyBkbyBJIGtub3cgYSBzdWJ2b2x1bWUgaXMgYSBzbmFwc2hvdD8NCj4gDQo+IEhpLA0K PiANCj4gT24gNy8xNy8xOSAxOjI0IEFNLCBVbGxpIEhvcmxhY2hlciB3cm90ZToNCj4gPg0KPiA+ IEkgdGhvdWdodCwgSSBjYW4gcmVjb2duaXplIGEgc25hcHNob3Qgd2hlbiBpdCBoYXMgYSBQYXJl bnQgVVVJRCwgYnV0DQo+ID4gdGhpcyBpcyBub3QgdHJ1ZSBmb3Igc25hcHNob3RzIG9mIHRvcGxl dmVsIHN1YnZvbHVtZXM6DQo+ID4NCj4gPiByb290QHRydWxsYTovIyBidHJmcyB2ZXJzaW9uDQo+ ID4gYnRyZnMtcHJvZ3MgdjQuNS4zKzIwMTYwNzI5DQo+ID4NCj4gPiByb290QHRydWxsYTovIyBi dHJmcyBzdWJ2b2x1bWUgc2hvdyAvbW50L3RtcCAvbW50L3RtcCBpcyB0b3BsZXZlbA0KPiA+IHN1 YnZvbHVtZQ0KPiA+DQo+ID4gcm9vdEB0cnVsbGE6LyMgYnRyZnMgc3Vidm9sdW1lIHNuYXBzaG90 IC9tbnQvdG1wIC9tbnQvdG1wL3NzIENyZWF0ZSBhDQo+ID4gc25hcHNob3Qgb2YgJy9tbnQvdG1w JyBpbiAnL21udC90bXAvc3MnDQo+ID4NCj4gPiByb290QHRydWxsYTovIyBidHJmcyBzdWJ2b2x1 bWUgY3JlYXRlIC9tbnQvdG1wL3h4IENyZWF0ZSBzdWJ2b2x1bWUNCj4gPiAnL21udC90bXAveHgn DQo+ID4NCj4gPiByb290QHRydWxsYTovIyBidHJmcyBzdWJ2b2x1bWUgc2hvdyAvbW50L3RtcC9z cyAvbW50L3RtcC9zcw0KPiA+ICAgICAgICAgTmFtZTogICAgICAgICAgICAgICAgICAgc3MNCj4g PiAgICAgICAgIFVVSUQ6ICAgICAgICAgICAgICAgICAgIDc3MzJiZGRlLTA0ODUtMjA0ZS1iNDFi LTgzMzM3NmU3OTFkYQ0KPiA+ICAgICAgICAgUGFyZW50IFVVSUQ6ICAgICAgICAgICAgLQ0KPiA+ ICAgICAgICAgUmVjZWl2ZWQgVVVJRDogICAgICAgICAgLQ0KPiA+ICAgICAgICAgQ3JlYXRpb24g dGltZTogICAgICAgICAgMjAxOS0wNy0xNyAwMTowMjo0OCArMDIwMA0KPiA+ICAgICAgICAgU3Vi dm9sdW1lIElEOiAgICAgICAgICAgMjcwDQo+ID4gICAgICAgICBHZW5lcmF0aW9uOiAgICAgICAg ICAgICA2MA0KPiA+ICAgICAgICAgR2VuIGF0IGNyZWF0aW9uOiAgICAgICAgNjANCj4gPiAgICAg ICAgIFBhcmVudCBJRDogICAgICAgICAgICAgIDUNCj4gPiAgICAgICAgIFRvcCBsZXZlbCBJRDog ICAgICAgICAgIDUNCj4gPiAgICAgICAgIEZsYWdzOiAgICAgICAgICAgICAgICAgIC0NCj4gPiAg ICAgICAgIFNuYXBzaG90KHMpOg0KPiA+DQo+ID4gcm9vdEB0cnVsbGE6LyMgYnRyZnMgc3Vidm9s dW1lIHNob3cgL21udC90bXAveHggL21udC90bXAveHgNCj4gPiAgICAgICAgIE5hbWU6ICAgICAg ICAgICAgICAgICAgIHh4DQo+ID4gICAgICAgICBVVUlEOiAgICAgICAgICAgICAgICAgICAzNDJi MjA2NS0xNjc5LTgyNDUtYmQ3Ni04ZGE1OThjYzMzZDgNCj4gPiAgICAgICAgIFBhcmVudCBVVUlE OiAgICAgICAgICAgIC0NCj4gPiAgICAgICAgIFJlY2VpdmVkIFVVSUQ6ICAgICAgICAgIC0NCj4g PiAgICAgICAgIENyZWF0aW9uIHRpbWU6ICAgICAgICAgIDIwMTktMDctMTcgMDE6MDM6MDIgKzAy MDANCj4gPiAgICAgICAgIFN1YnZvbHVtZSBJRDogICAgICAgICAgIDI3MQ0KPiA+ICAgICAgICAg R2VuZXJhdGlvbjogICAgICAgICAgICAgNjENCj4gPiAgICAgICAgIEdlbiBhdCBjcmVhdGlvbjog ICAgICAgIDYxDQo+ID4gICAgICAgICBQYXJlbnQgSUQ6ICAgICAgICAgICAgICA1DQo+ID4gICAg ICAgICBUb3AgbGV2ZWwgSUQ6ICAgICAgICAgICA1DQo+ID4gICAgICAgICBGbGFnczogICAgICAg ICAgICAgICAgICAtDQo+ID4gICAgICAgICBTbmFwc2hvdChzKToNCj4gPg0KPiA+IEhvdyBkbyBJ IGtub3cgdGhhdCAvbW50L3RtcC9zcyBpcyBhIHNuYXBzaG90Pw0KPiA+IEkgY2Fubm90IHNlZSBh IHNuYXBzaG90IGlkZW50aWZpZXIuDQo+ID4NCj4gDQo+IFRoZSB0ZWNobmljYWwgYW5zd2VyIGlz Og0KPiANCj4gKiBUaGUgdXVpZCBvZiB0aGUgdG9wLWxldmVsIHN1YnZvbCAoaWQgNSkgaXMNCj4g MDAwMDAwMDAtMDAwMC0wMDAwLTAwMDAtMDAwMDAwMDAwMDAwDQo+ICogVGhlIHBhcmVudCB1dWlk IG9mIHlvdXIgc25hcHNob3QvY2xvbmUgaXMgYWxzbyAwMDAwLi4uIGFzIGEgcmVzdWx0Lg0KPiAq IEZvciBpbnRlcnByZXRhdGlvbiBvZiBwYXJlbnQgdXVpZCBmaWVsZCwgdGhlcmUgaXMgbm8gZGlz dGluY3Rpb24gYmV0d2VlbiAiaGFzIG5vIHBhcmVudCB1dWlkIiAodGhlIGZpZWxkIGlzIGVtcHR5 LA0KPiB3aGljaCB0ZWNobmljYWxseSBtZWFucyBhbGwgYml0cyBhcmUgMCkgYW5kIHRoZSBhY3R1 YWwgdmFsdWUgMDAwMC4uLg0KPiAqIFNvLi4uIHRoZSB0b29saW5nIGRpc3BsYXlzIGl0IGFzICIt Ii4gwq9cXyjjg4QpXy/Crw0KPiANCj4gVGhlIHByYWN0aWNhbCBhbnN3ZXIgaXM6DQo+IA0KPiAq IERvbid0IHB1dCBhbnl0aGluZyBpbiB0aGUgdG9wIGxldmVsIHN1YnZvbCB0aGF0IHdvdWxkIG1h a2UgeW91IHdhbnQgdG8gc25hcHNob3QgaXQuDQo+IA0KPiBOb3RlOiBJbiBidHJmcyBkZXNpZ24s IHRoZXJlIGlzIG5vIHRlY2huaWNhbCBkaWZmZXJlbmNlIGJldHdlZW4gYSBzbmFwc2hvdCBhbmQg YSB3cml0YWJsZSBjbG9uZSAoYXMgb3Bwb3NlZCB0byBlLmcuDQo+IG5ldGFwcCBzbmFwc2hvdHMg YW5kIGNsb25lcykuIFRoaXMgbWFrZXMgdGhlIGRlc2lnbiBsZXNzIGNvbXBsaWNhdGVkLCBidXQg aXQgcmVzdWx0cyBpbiBhIGNvbGxlY3Rpb24gb2Yga25vd24gdXNhYmlsaXR5DQo+IGlzc3Vlcywg bGlrZSB0aGF0IGlmIHlvdSBleHBlY3QgdGhlbSB0byBiZSBkaWZmZXJlbnQsIHRoZXkgc3RpbGwg YXJlbid0Lg0KPiANCj4gSGFucw0KDQpIZWxsbywNCg0KRllJLCB0aGlzIHByb2JsZW0gc2hvdWxk IGJlIGZpeGVkIGluIG1rZnMuYnRyZnMgPj0gdjQuMTYgc2luY2UgdGhlIHRvcC1sZXZlbA0Kc3Vi dm9sdW1lIGFsc28gZ2V0cyBub24tZW1wdHkgVVVJRCBhdCBta2ZzIHRpbWUuDQoNClRoYW5rcw0K