From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Jianpeng Ma" Subject: Re: Re: [PATCH] md: Add two chances to update sync/recovery checkpoint Date: Thu, 20 Sep 2012 14:14:30 +0800 Message-ID: <2012092014142714084416@gmail.com> References: <201209151659317342260@gmail.com>, <20120920133654.1af42dda@notabene.brown> Mime-Version: 1.0 Content-Type: text/plain; charset="gb2312" Content-Transfer-Encoding: base64 Return-path: Sender: linux-raid-owner@vger.kernel.org To: Neil Brown Cc: linux-raid List-Id: linux-raid.ids T24gMjAxMi0wOS0yMCAxMTozNiBOZWlsQnJvd24gPG5laWxiQHN1c2UuZGU+IFdyb3RlOg0KPk9u IFNhdCwgMTUgU2VwIDIwMTIgMTY6NTk6MzQgKzA4MDAgIkppYW5wZW5nIE1hIiA8bWFqaWFucGVu Z0BnbWFpbC5jb20+IHdyb3RlOg0KPg0KPj4gQWNjb3JkaW5nIGNvbW1pdCA5N2U0ZjQyZDYyYmFk YjBmOWZiYzI3YzAxM2U4OSxpdCBoYXMgMTYgdGltZXMgdG8gdXBkYXRlDQo+PiBjaGVja3BvaW50 IG9mIHN5bmMvcmVjb3ZlcnkgaW4gZnVuYyBtZF9kb19zeW5jKCkuDQo+PiBCZWNhdXNlIHRoZSB0 aGUgc2l6ZSBvZiBIREQgYmVjYW1lIGxhcmdlcix0aGUgdGltZSBvZiBzeW5jL3JlY292ZXJ5IG1h eQ0KPj4gdGFrZW4gbG9uZyB0aW1lcy5TbyB0aGUgMS8xNiBvZiB0aW1lIG1heWJlIGhhbGYgaG91 ciBvciBtb3JlLg0KPj4gU28gaXQgc2hvdWxkIGFkZCBjaGFuY2UgdG8gdXBkYXRlIGNoZWNrcG9p bnQuDQo+PiBUaGVyZSBhcmUgcGxhY2VzIHdoaWNoIGNhbiB1cGRhdGUgY2hlY2twb2ludCBpbiBt ZF9kb19zeW5jLg0KPj4gMTogSWYgY2FsbCBjb25kX3Jlc2NoZWQgYW5kIHJlYWxseSBzY2hlZA0K Pj4gMjogSWYgY3Vycl9zcGVlZCBpcyBsYXJnZXIgdGhhbiBtYXhfc3luY19zcGVkZA0KPj4gSWYg YWJvdmUgY29uZGl0aW9ucyBhcmUgb2ssIHdlIGNhbiB0cnkgdG8gdXBkYXRlIGNoZWNrcG9pbnQu DQo+PiANCj4+IFNpZ25lZC1vZmYtYnk6IEppYW5wZW5nIE1hIDxtYWppYW5wZW5nQGdtYWlsLmNv bT4NCj4+IC0tLQ0KPj4gIGRyaXZlcnMvbWQvbWQuYyB8ICAgMTYgKysrKysrKysrKysrKysrLQ0K Pj4gIDEgZmlsZSBjaGFuZ2VkLCAxNSBpbnNlcnRpb25zKCspLCAxIGRlbGV0aW9uKC0pDQo+PiAN Cj4+IGRpZmYgLS1naXQgYS9kcml2ZXJzL21kL21kLmMgYi9kcml2ZXJzL21kL21kLmMNCj4+IGlu ZGV4IDNmNjIwM2EuLmM3OTkzZDYgMTAwNjQ0DQo+PiAtLS0gYS9kcml2ZXJzL21kL21kLmMNCj4+ ICsrKyBiL2RyaXZlcnMvbWQvbWQuYw0KPj4gQEAgLTc0OTYsNyArNzQ5NiwxNCBAQCB2b2lkIG1k X2RvX3N5bmMoc3RydWN0IG1kZGV2ICptZGRldikNCj4+ICAJCSAqIGFib3V0IG5vdCBvdmVybG9h ZGluZyB0aGUgSU8gc3Vic3lzdGVtLiAodGhpbmdzIGxpa2UgYW4NCj4+ICAJCSAqIGUyZnNjayBi ZWluZyBkb25lIG9uIHRoZSBSQUlEIGFycmF5IHNob3VsZCBleGVjdXRlIGZhc3QpDQo+PiAgCQkg Ki8NCj4+IC0JCWNvbmRfcmVzY2hlZCgpOw0KPj4gKwkJaWYgKGNvbmRfcmVzY2hlZCgpKQ0KPj4g KwkJCWlmICghdGVzdF9iaXQoTURfUkVDT1ZFUllfUkVTSEFQRSwgJm1kZGV2LT5yZWNvdmVyeSkg JiYNCj4+ICsJCQkJCW1kZGV2LT5jdXJyX3Jlc3luY19jb21wbGV0ZWQgIT0gaiAmJg0KPj4gKwkJ CQkJYXRvbWljX3JlYWQoJm1kZGV2LT5yZWNvdmVyeV9hY3RpdmUpID09IDApIHsNCj4+ICsJCQkJ bWRkZXYtPmN1cnJfcmVzeW5jX2NvbXBsZXRlZCA9IGo7DQo+PiArCQkJCXNldF9iaXQoTURfQ0hB TkdFX0NMRUFOLCAmbWRkZXYtPmZsYWdzKTsNCj4+ICsJCQkJc3lzZnNfbm90aWZ5KCZtZGRldi0+ a29iaiwgTlVMTCwgInN5bmNfY29tcGxldGVkIik7DQo+PiArCQkJfQ0KPj4gIA0KPj4gIAkJY3Vy cnNwZWVkID0gKCh1bnNpZ25lZCBsb25nKShpb19zZWN0b3JzLW1kZGV2LT5yZXN5bmNfbWFya19j bnQpKS8yDQo+PiAgCQkJLygoamlmZmllcy1tZGRldi0+cmVzeW5jX21hcmspL0haICsxKSArMTsN Cj4+IEBAIC03NTA1LDYgKzc1MTIsMTMgQEAgdm9pZCBtZF9kb19zeW5jKHN0cnVjdCBtZGRldiAq bWRkZXYpDQo+PiAgCQkJaWYgKChjdXJyc3BlZWQgPiBzcGVlZF9tYXgobWRkZXYpKSB8fA0KPj4g IAkJCQkJIWlzX21kZGV2X2lkbGUobWRkZXYsIDApKSB7DQo+PiAgCQkJCW1zbGVlcCg1MDApOw0K Pj4gKwkJCQlpZiAoIXRlc3RfYml0KE1EX1JFQ09WRVJZX1JFU0hBUEUsICZtZGRldi0+cmVjb3Zl cnkpICYmDQo+PiArCQkJCQltZGRldi0+Y3Vycl9yZXN5bmNfY29tcGxldGVkICE9IGogJiYNCj4+ ICsJCQkJCWF0b21pY19yZWFkKCZtZGRldi0+cmVjb3ZlcnlfYWN0aXZlKSA9PSAwKSB7DQo+PiAr CQkJCQltZGRldi0+Y3Vycl9yZXN5bmNfY29tcGxldGVkID0gajsNCj4+ICsJCQkJCXNldF9iaXQo TURfQ0hBTkdFX0NMRUFOLCAmbWRkZXYtPmZsYWdzKTsNCj4+ICsJCQkJCXN5c2ZzX25vdGlmeSgm bWRkZXYtPmtvYmosIE5VTEwsICJzeW5jX2NvbXBsZXRlZCIpOw0KPj4gKwkJCQl9DQo+PiAgCQkJ CWdvdG8gcmVwZWF0Ow0KPj4gIAkJCX0NCj4+ICAJCX0NCj4NCj5JIGRvbid0IHJlYWxseSBsaWtl IHRoaXMuICBUaGVzZSB0d28gY29uZGl0aW9ucyBzZWVtcyByYXRoZXIgYXJiaXRyYXJ5Lg0KPklm IHdlIHdhbnQgdG8gZG8gYSBjaGVja3BvaW50IG1vcmUgb2Z0ZW4sIHdlIHNob3VsZCB1c2Ugc29t ZSB0aW1lIGJhc2VkIHRlc3QNCj50byBkbyBpdC4NCj4NCj5XaGF0IHJlc3VsdHMgZG8geW91IGdl dCB3aXRoIHRoaXMgY2hhbmdlPyAgSG93IG9mdGVuIGRvZXMgYSBjaGVja3BvaW50IGhhcHBlbg0K Pm9uIGEgYnVzeSBzeXN0ZW0/ICBIb3cgb2Z0ZW4gb24gYW4gaWRsZSBzeXN0ZW0/DQpNeSB0aG91 Z2ggaXMgaWYgY29uZF9yZXNjaGVkIG9yIG1zbGVlcCByZXR1cm5lZCBhbmQgYXRvbWljX3JlYWQo Jm1kZGV2LT5yZWNvdmVyeV9hY3RpdmUpID09IDAsDQp3ZSBjYW4gY2hhbmdlIHJlY292ZXJ5X3Vw IGFuZCBkb3Nlbid0IHdhaXQgbWRkZXYtPnJlY292ZXJ5X2FjdGl2ZT09MC4NClRoZXJlIGFyZSBt YW55IHBsYWNlIHRvIGNoZWNrIHJlY292ZXJ5X2NwLCBzbyBhcyBwb3NzaWJsZSBhcyB0byB1cGRh dGUgcmVjb3ZlcnlfY3AgbWF5IGJlIGdvb2QuDQo+DQo+QSB0aW1lLWJhc2VkIHVwZGF0ZSBjb3Vs ZCBiZSBkb25lIGluIHVzZXItc3BhY2UuICBKdXN0IHdyaXRlICdpZGxlJyB0bw0KPidzeW5jX2Fj dGlvbicgYW5kIGl0IHNob3VsZCBkbyBhIGNoZWNrcG9pbnQsIHRoZW4gaW1tZWRpYXRlbHkgcmVz dGFydCBmcm9tDQo+d2hlcmUgaXQgbGVmdCBvZmYuDQo+DQo+TmVpbEJyb3duDQo+