From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Jianpeng Ma" Subject: Re: Re: [patch]raid5: fix directio regression Date: Thu, 9 Aug 2012 09:20:05 +0800 Message-ID: <201208090919591567972@gmail.com> References: <20120807032240.GA22495@kernel.org> <201208071312593120932@gmail.com> <201208071421033759628@gmail.com> <201208081321202343795@gmail.com>, Mime-Version: 1.0 Content-Type: text/plain; charset="gb2312" Content-Transfer-Encoding: base64 Return-path: Sender: linux-raid-owner@vger.kernel.org To: shli Cc: linux-raid , Neil Brown List-Id: linux-raid.ids T24gMjAxMi0wOC0wOCAyMDo1MyBTaGFvaHVhIExpIDxzaGxpQGtlcm5lbC5vcmc+IFdyb3RlOg0K PjIwMTIvOC84IEppYW5wZW5nIE1hIDxtYWppYW5wZW5nQGdtYWlsLmNvbT46DQo+PiBPbiAyMDEy LTA4LTA4IDEwOjU4IFNoYW9odWEgTGkgPHNobGlAa2VybmVsLm9yZz4gV3JvdGU6DQo+Pj4yMDEy LzgvNyBKaWFucGVuZyBNYSA8bWFqaWFucGVuZ0BnbWFpbC5jb20+Og0KPj4+PiBPbiAyMDEyLTA4 LTA3IDEzOjMyIFNoYW9odWEgTGkgPHNobGlAa2VybmVsLm9yZz4gV3JvdGU6DQo+Pj4+PjIwMTIv OC83IEppYW5wZW5nIE1hIDxtYWppYW5wZW5nQGdtYWlsLmNvbT46DQo+Pj4+Pj4gT24gMjAxMi0w OC0wNyAxMToyMiBTaGFvaHVhIExpIDxzaGxpQGtlcm5lbC5vcmc+IFdyb3RlOg0KPj4+Pj4+Pk15 IGRpcmVjdElPIHJhbmRvbXdyaXRlIDRrIHdvcmtsb2FkIHNob3dzIGEgMTB+MjAlIHJlZ3Jlc3Np b24gY2F1c2VkIGJ5IGNvbW1pdA0KPj4+Pj4+Pjg5NWUzYzVjNThhODBiYi4gZGlyZWN0SU8gdXN1 YWxseSBpcyByYW5kb20gSU8gYW5kIGlmIHJlcXVlc3Qgc2l6ZSBpc24ndCBiaWcNCj4+Pj4+Pj4o d2hpY2ggaXMgdGhlIGNvbW1vbiBjYXNlKSwgZGVsYXkgaGFuZGxpbmcgb2YgdGhlIHN0cmlwZSBo YXNuJ3QgYW55IGFkdmFudGFnZXMuDQo+Pj4+Pj4+Rm9yIGJpZyBzaXplIHJlcXVlc3QsIGRlbGF5 IGNhbiBzdGlsbCByZWR1Y2UgSU8uDQo+Pj4+Pj4+DQo+Pj4+Pj4+U2lnbmVkLW9mZi1ieTogU2hh b2h1YSBMaSA8c2hsaUBmdXNpb25pby5jb20+DQo+Pj4+IFtzbmlwXQ0KPj4+Pj4+Pi0tDQo+Pj4+ Pj4gTWF5IGJlIHVzZWQgc2l6ZSB0byBqdWRnZSBpcyBub3QgYSBnb29kIG1ldGhvZC4NCj4+Pj4+ PiBJIGZpcnN0bHkgc2VuZGVkIHRoaXMgcGF0Y2gsIG9ubHkgd2FudCB0byBjb250cm9sIGRpcmVj dC13cml0ZS1ibG9jayxub3QgZm9yIHJlcXVsYXIgZmlsZS4NCj4+Pj4+PiBCZWNhdXNlIGkgdGhp bmsgaWYgc29tZW9uZSB1c2VkIGRpcmVjdC13cml0ZS1ibG9jayBmb3IgcmFpZDUsaGUgc2hvdWxk IGtub3cgdGhlIGZlYXR1cmUgb2YgcmFpZDUgYW5kIGhlIGNhbiBjb250cm9sDQo+Pj4+Pj4gZm9y IHdyaXRlIHRvIGZ1bGwtd3JpdGUuDQo+Pj4+Pj4gQnV0IGF0IHRoYXQgdGltZSwgaSBkaWQga25v dyBob3cgdG8gZGlmZmVyZW50aWF0ZSBiZXR3ZWVuIHJlZ3VsYXIgZmlsZSBhbmQgYmxvY2stZGV2 aWNlLg0KPj4+Pj4+IEkgdGhpayB3ZSBzaG91bGQgZG8gc29tZXRoaW5nIHRvIGRvIHRoaXMuDQo+ Pj4+Pg0KPj4+Pj5JIGRvbid0IHRoaW5rIGl0J3MgcG9zc2libGUgdXNlciBjYW4gY29udHJvbCBo aXMgd3JpdGUgdG8gYmUgYQ0KPj4+Pj5mdWxsLXdyaXRlIGV2ZW4gZm9yDQo+Pj4+PnJhdyBkaXNr IElPLiBXaHkgcmVndWxhciBmaWxlIGFuZCBibG9jayBkZXZpY2UgaW8gbWF0dGVycyBoZXJlPw0K Pj4+Pj4NCj4+Pj4+VGhhbmtzLA0KPj4+Pj5TaGFvaHVhDQo+Pj4+IEFub3RoZXIgcHJvYmxlbSBp cyB0aGUgc2l6ZS4gSG93IHRvIGp1ZGdlIHRoZSBzaXplIGlzIGxhcmdlIG9yIG5vdD8NCj4+Pj4g QSBzeXNjYWxsIHdyaXRlIGlzIGEgZGlvIGFuZCBhIGRpbyBtYXkgYmUgc3BsaXQgbW9yZSBiaW9z Lg0KPj4+PiBGb3IgbXkgd29ya2xvYWQsIGkgdXN1YWx5IHdyaXRlIGNodW5rLXNpemUuDQo+Pj4+ IEJ1dCB5b3VyIHBhdGNoIGlzIGp1ZGdlIGJ5IGJpby1zaXplLg0KPj4+DQo+Pj5JJ2QgaWdub3Jl IHdvcmtsb2FkIHdoaWNoIGRvZXMgc2VxdWVudGlhbCBkaXJlY3RJTywgdGhvdWdoDQo+Pj55b3Vy IHdvcmtsb2FkIGlzLCBidXQgSSBiZXQgbm8gcmVhbCB3b3JrbG9hZHMgYXJlLiBTbyBJJ2QgbGlr ZQ0KPj4gU29ycnksbXkgZXhwbGFpbiBtYXliZSBub3QgY29yY3JlY3QuIEkgd3JpdGUgZGF0YSBv bmNlIHdoaWNoIHNpemUgaXMgYWxtb3N0IGNodW5rcy1zaXplICogZGV2aWNlcyxpbiBvcmRlciB0 byBmdWxsLXdyaXRlDQo+PiBhbmQgYXMgcG9zc2libGUgYXMgdG8gbm8gcHJlLXJlYWQgb3BlcmF0 aW9uLg0KPj4+b25seSB0byBjb25zaWRlciBiaWcgc2l6ZSByYW5kb20gZGlyZWN0aW8uIEkgYWdy ZWUgdGhlIHNpemUNCj4+Pmp1ZGdlIGlzIGFyYml0cmFyeS4gSSBjYW4gb3B0aW1pemUgaXQgdG8g YmUgb25seSBjb25zaWRlciBzdHJpcGUNCj4+PndoaWNoIGhpdHMgdHdvIG9yIG1vcmUgZGlza3Mg aW4gb25lIGJpbywgYnV0IG5vdCBzdXJlIGlmIGl0J3MNCj4+PndvcnRoeSBkb2luZy4gTm90IHdh cmUgYmlnIHNpemUgZGlyZWN0aW8gaXMgY29tbW9uLCBhbmQgZXZlbg0KPj4+aXMsIGJpZyBzaXpl IHJlcXVlc3QgSU9QUyBpcyBsb3csIGEgYml0IGRlbGF5IG1heWJlIG5vdCBhIGJpZw0KPj4+ZGVh bC4NCj4+IElmIGFkZCBhIGFjY190aW1lIGZvciAnc3RyaWVwX2hlYWQnIHRvIGNvbnRyb2w/DQo+ PiBXaGVuIGdldF9hY3RpdmVfc3RyaXBlKCkgaXMgb2ssIHVwZGF0ZSBhY2NfdGltZS4NCj4+IEZv ciBzb21lIHRpbWUsIHN0cmlwZV9oZWFkIGRpZCBub3QgYWNjZXNzIGFuZCBpdCBzaG9sZCBwcmUt cmVhZC4NCj4NCj5EbyB5b3Ugd2FudCB0byBhZGQgYSB0aW1lciBmb3IgZWFjaCBzdHJpcGU/IFRo aXMgaXMgZXZlbiB1Z2x5Lg0KPkhvdyBkbyB5b3UgY2hvb3NlIHRoZSBleHBpcmUgdGltZT8gQSB0 aW1lIHdvcmtzIGZvciBoYXJkZGlzaw0KPmRlZmluaXRlbHkgd2lsbCBub3Qgd29yayBmb3IgYSBm YXN0IFNTRC4NCkEgdGltZSBpcyBsaWtlIHRoZSBzaXplIHdoaWNoIGlzIGFyYml0cmFyeS4NCkhv dyBhYm91dCBhZGQgYSBpbnRlcmZhY2UgaW4gc3lzZnMgdG8gY29udHJvbCBieSB1c2VyPyANCk9u bHkgdXNlciBjYW4ganVkZ2UgdGhlIHdvcmtsb2FkLCB3aGljaCBzZXF1YXRpYWwgd3JpdGUgb3Ig cmFuZG9tIHdyaXRlLg0K