From mboxrd@z Thu Jan 1 00:00:00 1970 From: majianpeng Subject: Re: Re: [PATCH 3/3] raid1: Rewrite the implementation of iobarrier. Date: Mon, 26 Aug 2013 18:45:55 +0800 Message-ID: <201308261845528793696@gmail.com> References: <201308191958041664556@gmail.com>, <20130826174632.7224da0b@notabene.brown> Reply-To: majianpeng Mime-Version: 1.0 Content-Type: text/plain; charset="gb2312" Content-Transfer-Encoding: base64 Return-path: Sender: linux-raid-owner@vger.kernel.org To: NeilBrown Cc: linux-raid List-Id: linux-raid.ids Pk9uIE1vbiwgMTkgQXVnIDIwMTMgMTk6NTg6MDcgKzA4MDAgbWFqaWFucGVuZyA8bWFqaWFucGVu Z0BnbWFpbC5jb20+IHdyb3RlOg0KPg0KW3NuaXBdDQo+PiAtDQo+PiAtCS8qIE5vdyB3YWl0IGZv ciBhbGwgcGVuZGluZyBJTyB0byBjb21wbGV0ZSAqLw0KPj4gKwkvKiBGb3IgdGhvc2UgY29uZGl0 aW9ucywgd2UgbXVzdCB3YWl0DQo+PiArCSAqIEE6YXJyYXkgaXMgaW4gZnJlZXplIHN0YXRlLg0K Pj4gKwkgKiBCOldoZW4gc3RhcnRpbmcgcmVzeW5jIGFuZCB0aGVyZSBhcmUgbm9ybWFsIElPDQo+ PiArCSAqIEM6VGhlcmUgaXMgbm8gbm9ybmFsIGlvIGFmdGVyIHRocmVlIHRpbWVzIGluIHJlc3lu YyB3aW5kb3cNCj4+ICsJICogRDogdG90YWwgYmFycmllciBhcmUgbGVzcyB0aGFuIFJFU1lOQ19E RVBUSCovDQo+PiAgCXdhaXRfZXZlbnRfbG9ja19pcnEoY29uZi0+d2FpdF9iYXJyaWVyLA0KPj4g LQkJCSAgICAhY29uZi0+ZnJlZXplX2FycmF5ICYmIA0KPj4gLQkJCSAgICAhY29uZi0+bnJfcGVu ZGluZyAmJiBjb25mLT5iYXJyaWVyIDwgUkVTWU5DX0RFUFRILA0KPj4gKwkJCSAgICAhY29uZi0+ ZnJlZXplX2FycmF5ICYmDQo+PiArCQkJICAgICgoY29uZi0+bmV4dF9yZXN5bmMgPCBSRVNZTkNf V0lORE9XX1NFQ1RPUlMNCj4+ICsJCQkJJiYgIWNvbmYtPm5yX3BlbmRpbmcpDQo+PiArCQkJICAg IHx8IChjb25mLT5uZXh0X3Jlc3luYyArIFJFU1lOQ19TRUNUT1JTDQo+PiArCQkJCSAgICA8PSBj b25mLT5hZnRlcl9yZXN5bmNfc2VjdG9yKSkNCj4+ICsJCQkgICAgJiYgY29uZi0+YmFycmllciA8 IFJFU1lOQ19ERVBUSCwNCj4+ICAJCQkgICAgY29uZi0+cmVzeW5jX2xvY2spOw0KPg0KPkZvciAi QzpUaGVyZSBpcyBubyBub3JuYWwgaW8gYWZ0ZXIgdGhyZWUgdGltZXMgaW4gcmVzeW5jIHdpbmRv dyIgSSBleHBlY3RlZA0KPnRvIHNlZQ0KPiAgICAgICAgICBjb25mLT5hZnRlcl9yZXN5bmNfdGhy ZWVfY291bnQgPT0gMA0KPg0KPmJ1dCBJIGRvbid0IHNlZSB0aGF0LiAgV2h5IG5vdD8NCj4NCkkg dGhpbmsgdGhlcmUgYXJlIHR3byBtaXN0YWtlcy4NCkZvciB0aG9zZSBjb25kaXRpb25zLCB3ZSBt dXN0IHdhaXQ6DQpBOkFycmF5IGlzIGluIGZyZWV6ZSBzdGF0ZS4NCkI6Y29uZi0+bnJfcGVuZGlu ZyA+IDAgW0ZvciB0aGlzLCBmaXJ0bHksIGkgdGhpbmsgd2Ugc2hvdWxkIG9ubHkgY29uc2lkZXIg dGhlIHN0YXJ0aW5nIHJlc3luYy5JZiAtPm5yX3BlbmRpbmcgPiAwLHdlIG11c3Qgd2FpdA0Kd2hl dGhlciBvciBub3Qgc3RhcnRpbmcgcmVzeW5jLl0NCkM6Y29uZi0+bmV4dF9yZXN5bmMgKyBSRVNZ TkNfU0VDVE9SUyA+IGNvbmYtPmFmdGVyX3Jlc3luY19zZWN0b3IuDQpEOlRvdGFsIGJhcnJpZXIg YXJlIG1vcmUgdGhhbiBSRVNZTkNfREVQVEguDQoNCltzbmlwXQ0KDQo+DQo+PiAgCQlmb3IgKGog PSAwOyBqIDwgaTsgaisrKQ0KPj4gIAkJCWlmIChyMV9iaW8tPmJpb3Nbal0pDQo+PiAgCQkJCXJk ZXZfZGVjX3BlbmRpbmcoY29uZi0+bWlycm9yc1tqXS5yZGV2LCBtZGRldik7DQo+PiAgCQlyMV9i aW8tPnN0YXRlID0gMDsNCj4+IC0JCWFsbG93X2JhcnJpZXIoY29uZik7DQo+PiArCQlhbGxvd19i YXJyaWVyKGNvbmYsIG9sZCwgYmlvLT5iaV9zZWN0b3IpOw0KPj4gIAkJbWRfd2FpdF9mb3JfYmxv Y2tlZF9yZGV2KGJsb2NrZWRfcmRldiwgbWRkZXYpOw0KPj4gLQkJd2FpdF9iYXJyaWVyKGNvbmYp Ow0KPj4gKwkJYWZ0ZXJfdGhyZWV0aW1lc19yZXN5bmNfc2VjdG9yID0gd2FpdF9iYXJyaWVyKGNv bmYsIGJpbyk7DQo+PiArCQkvKg0KPj4gKwkJICogV2UgbXVzdCBtYWtlIHN1cmUgdGhlIG11bHRp IHIxYmlvcyBvZiBiaW8gaGF2ZQ0KPj4gKwkJICogdGhlIHNhbWUgdmFsdWUgb2YgYWZ0ZXJfdGhy ZWV0aW1lc19yZXN5bmNfc2VjdG9yDQo+PiArCQkgKi8NCj4+ICsJCWlmIChiaW8tPmJpX3BoeXNf c2VnbWVudHMgJiYgb2xkICYmDQo+PiArCQkJb2xkICE9IGFmdGVyX3RocmVldGltZXNfcmVzeW5j X3NlY3RvcikNCj4+ICsJCQkvKndhaXQgdGhlIGZvcm1lciByMWJpbyhzKSBjb21wbGV0ZWQqLw0K Pj4gKwkJCXdhaXRfZXZlbnQoY29uZi0+d2FpdF9iYXJyaWVyLA0KPj4gKwkJCQkJYmlvLT5iaV9w aHlzX3NlZ21lbnRzID09IDEpOw0KPg0KPkkgdGhpbmsgaXQgaXMgcXVpdGUgcG9zc2libGUgdGhh dCBiaV9waHlzX3NlZ21lbnRzPT0wIGF0IHRoaXMgcG9pbnQuDQo+U28geW91IHByb2JhYmx5IHdh bnQgIjw9IDEiLg0KPg0KTm8sIG9ubHkgdGhlcmUgYXJlIG11bHRpIHIxYmlvcyBvZiBiaW8sIGl0 IG11c3Qgd2FpdCBwcmV2aW91cyByMWJpb3MgY29tcGxldGVkLlRoZSBsZWZ0IHIxYmlvIG1hZGUn YmlfcGh5c19zZWdtZW50cyA9IDEnLg0KSWYgdGhlcmUgaXMgb25lIHIxYmlvIG9mIGJpbywgaXQg Y2FuJ3Qgd2FpdC5JdCBvbmx5IG5lZWQgYWxsb3dfYmFycmllciBhbmQgcmV0cnkgd2FpdF9iYXJy aWVyLg0KDQoNCg0KRm9yIG90aGVyIGNvbW1lbnRzLCBpJ2xsIGFwcGx5Lg0KVGhhbmtzIQ0KSmlh bnBlbmcgTWE=