From mboxrd@z Thu Jan 1 00:00:00 1970 From: "=?utf-8?B?Wmhlbmd5dWFuIExpdQ==?=" Subject: Re: [PATCH] md/raid5: write an empty meta-block when creating logsuper-block Date: Tue, 25 Oct 2016 20:43:50 +0800 Message-ID: Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Return-path: Sender: linux-raid-owner@vger.kernel.org To: =?utf-8?B?U2hhb2h1YSBMaQ==?= Cc: =?utf-8?B?c2hsaQ==?= , =?utf-8?B?U29uZyBMaXU=?= , =?utf-8?B?bGludXgtcmFpZA==?= , =?utf-8?B?bGl1emhlbmd5dWFuZzUyMQ==?= List-Id: linux-raid.ids QWZ0ZXIgZGlzY3Vzc2lvbiB3aXRoIG15IGNvbGxlYWd1ZSwgSSB0aGluayB0aGVyZSBpcyBz dGlsbCBhIHByb2JsZW0gdGhhdA0KbWF5IGhhcHBlbiB2ZXJ5IHVubGlrZWx5LlRoZSBzdXBl cmJsb2NrIHNob3VsZCBwb2ludCB0byB0aGUgbGFzdCBtZXRhDQpibG9jayB3ZSBoYXZlIHdy aXR0ZW4gYWZ0ZXIgbG9nIHJlY2xhaW0gb3IgcG9pbnQgdG8gdGhlIGVtdHB5IG1ldGEgYmxv Y2sNCmFmdGVyIGxvZyByZWNvdmVyeSwganVzdCBjb25zaWRlciB3ZSB3cml0ZSBzb21lIG1l dGEgYmxvY2sgYmVoaW5kIHRoZQ0Kc3VwZXJibG9jayBwb3NpdGlvbiBhbmQgc3VwcG9zZSBj cmFzaCBoYXBwZW5zLiBJZiB0aGUgZmlyc3QgbWV0YSBibG9jayB3ZQ0KaGF2ZSB3cml0dGVu IG5laWdoYm9yaW5nIHRoZSBzdXBlcmJsb2NrIHBvc2l0aW9uIGlzIGludmFsaWQsICBjdHgu c2VxIHdvdWxkIA0KYWxzbyBlcXVhbCB0byBsYXN0X2NwX3NlcSsxIGFmdGVyIHdlIGRpZCBh IHJlY292ZXJ5IC4gU28gdGhlIHNhZmVzdCB3YXkgaXMgDQp3ZSBhbHdheXMgd3JpdGUgYW4g ZW1wdHkgbWV0YSBibG9jayBhdCBjdHgucG9zIG5vIG1hdHRlciBob3cgbXVjaA0KY3R4LnJl cSBpcyBtb3JlIHRoYW4gbGFzdF9jcF9zZXEgYWZ0ZXIgd2UgZGlkIGEgcmVjb3ZlcnkuIA0K SG93IGRvIHlvdSB0aGluaywgU2hhb2h1YT8gSWYgaXQgaXMgbmVjZXNzYXJ5LCBJJ2QgcmV2 ZXJ0IHRoaXMgcGF0Y2ggYW5kDQpyZXNlbmQgb25lLg0KDQotLS0tLS0tLS0tLS0tLS0tLS0g T3JpZ2luYWwgLS0tLS0tLS0tLS0tLS0tLS0tDQpGcm9tOiAgIlNoYW9odWEgTGkiPHNobGlA a2VybmVsLm9yZz47DQpEYXRlOiAgVHVlLCBPY3QgMjUsIDIwMTYgMDU6MjMgQU0NClRvOiAg IlpoZW5neXVhbiBMaXUiPGxpdXpoZW5neXVhbkBreWxpbm9zLmNuPjsNCkNjOiAgInNobGki PHNobGlAZmIuY29tPjsgIlNvbmcgTGl1Ijxzb25nbGl1YnJhdmluZ0BmYi5jb20+OyAibGlu dXgtcmFpZCI8bGludXgtcmFpZEB2Z2VyLmtlcm5lbC5vcmc+OyAibGl1emhlbmd5dWFuZzUy MSI8bGl1emhlbmd5dWFuZzUyMUBnbWFpbC5jb20+Ow0KU3ViamVjdDogIFJlOiBbUEFUQ0hd IG1kL3JhaWQ1OiB3cml0ZSBhbiBlbXB0eSBtZXRhLWJsb2NrIHdoZW4gY3JlYXRpbmcgbG9n c3VwZXItYmxvY2sNCiANCk9uIE1vbiwgT2N0IDI0LCAyMDE2IGF0IDA0OjE1OjU5UE0gKzA4 MDAsIFpoZW5neXVhbiBMaXUgd3JvdGU6DQo+IElmIHN1cGVyYmxvY2sgcG9pbnRzIHRvIGFu IGludmFsaWQgbWV0YSBibG9jaywgcjVsX2xvYWRfbG9nIHdpbGwgc2V0DQo+IGNyZWF0ZV9z dXBlciB3aXRoIHRydWUgYW5kIGNyZWF0ZSBhbiBuZXcgc3VwZXJibG9jaywgdGhpcyBydW50 aW1lIHBhdGgNCj4gd291bGQgYWx3YXlzIGhhcHBlbiBpZiB3ZSBkbyBubyB3cml0aW5nIEkv TyB0byB0aGlzIGFycmF5IHNpbmNlIGl0IHdhcw0KPiBjcmVhdGVkLiBXcml0aW5nIGFuIGVt cHR5IG1ldGEgYmxvY2sgY291bGQgYXZvaWQgdGhpcyB1bm5lY2Vzc2FyeQ0KPiBhY3Rpb24g YXQgdGhlIGZpcnN0IHRpbWUgd2UgY3JlYXRlZCBsb2cgc3VwZXJibG9jay4NCj4gDQo+IEFu b3RoZXIgcmVhc29uIGlzIGZvciB0aGUgY29ycmV0bmVzcyBvZiBsb2cgcmVjb3ZlcnkuIEN1 cnJlbnRseSB3ZSBoYXZlDQo+IGJlbGxvdyBjb2RlIHRvIGd1YXJhbnRlZSBsb2cgcmV2b2Nl cnkgdG8gYmUgY29ycmVjdC4NCj4gDQo+ICAgICAgICAgaWYgKGN0eC5zZXEgPiBsb2ctPmxh c3RfY3Bfc2VxICsgMSkgew0KPiAgICAgICAgICAgICAgICAgaW50IHJldDsNCj4gDQo+ICAg ICAgICAgICAgICAgICByZXQgPSByNWxfbG9nX3dyaXRlX2VtcHR5X21ldGFfYmxvY2sobG9n LCBjdHgucG9zLCBjdHguc2VxICsgMTApOw0KPiAgICAgICAgICAgICAgICAgaWYgKHJldCkN Cj4gICAgICAgICAgICAgICAgICAgICAgICAgcmV0dXJuIHJldDsNCj4gICAgICAgICAgICAg ICAgIGxvZy0+c2VxID0gY3R4LnNlcSArIDExOw0KPiAgICAgICAgICAgICAgICAgbG9nLT5s b2dfc3RhcnQgPSByNWxfcmluZ19hZGQobG9nLCBjdHgucG9zLCBCTE9DS19TRUNUT1JTKTsN Cj4gICAgICAgICAgICAgICAgIHI1bF93cml0ZV9zdXBlcihsb2csIGN0eC5wb3MpOw0KPiAg ICAgICAgIH0gZWxzZSB7DQo+ICAgICAgICAgICAgICAgICBsb2ctPmxvZ19zdGFydCA9IGN0 eC5wb3M7DQo+ICAgICAgICAgICAgICAgICBsb2ctPnNlcSA9IGN0eC5zZXE7DQo+ICAgICAg ICAgfQ0KPiANCj4gSWYgd2UganVzdCBjcmVhdGVkIGEgYXJyYXkgd2l0aCBhIGpvdXJuYWwg ZGV2aWNlLCBsb2ctPmxvZ19zdGFydCBhbmQNCj4gbG9nLT5sYXN0X2NoZWNrcG9pbnQgc2hv dWxkIGFsbCBiZSAwLCB0aGVuIHdlIHdyaXRlIHRocmVlIG1ldGEgYmxvY2sNCj4gd2hpY2gg YXJlIHZhbGlkIGV4Y2VwdCBtaWQgb25lIGFuZCBzdXBwb3NlZCBjcmFzaCBoYXBwZW5lZC4g VGhlIGN0eC5zZXENCj4gd291bGQgZXF1YWwgdG8gbG9nLT5sYXN0X2NwX3NlcSArIDEgYW5k IGxvZy0+bG9nX3N0YXJ0IHdvdWxkIGJlIHNldCB0bw0KPiBwb3NpdGlvbiBvZiBtaWQgaW52 YWxpZCBtZXRhIGJsb2NrIGFmdGVyIHdlIGRpZCBhIHJlY292ZXJ5LCB0aGlzIHdpbGwNCj4g bGVhZCB0byBwcm9ibGVtcyB3aGljaCBjb3VsZCBiZSBhdm9pZGVkIHdpdGggdGhpcyBwYXRj aC4NCg0KVGhpcyB3b3VsZCBiZSB2ZXJ5IHVubGlrZWx5LCBidXQgYmV0dGVyIHRvIGZpeC4g QXBwbGllZCwgdGhhbmtzIQ==