From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Jianpeng Ma" Subject: Re: Re: [patch]raid5: fix directio regression Date: Wed, 8 Aug 2012 13:21:23 +0800 Message-ID: <201208081321202343795@gmail.com> References: <20120807032240.GA22495@kernel.org> <201208071312593120932@gmail.com> <201208071421033759628@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 T24gMjAxMi0wOC0wOCAxMDo1OCBTaGFvaHVhIExpIDxzaGxpQGtlcm5lbC5vcmc+IFdyb3RlOg0K PjIwMTIvOC83IEppYW5wZW5nIE1hIDxtYWppYW5wZW5nQGdtYWlsLmNvbT46DQo+PiBPbiAyMDEy LTA4LTA3IDEzOjMyIFNoYW9odWEgTGkgPHNobGlAa2VybmVsLm9yZz4gV3JvdGU6DQo+Pj4yMDEy LzgvNyBKaWFucGVuZyBNYSA8bWFqaWFucGVuZ0BnbWFpbC5jb20+Og0KPj4+PiBPbiAyMDEyLTA4 LTA3IDExOjIyIFNoYW9odWEgTGkgPHNobGlAa2VybmVsLm9yZz4gV3JvdGU6DQo+Pj4+Pk15IGRp cmVjdElPIHJhbmRvbXdyaXRlIDRrIHdvcmtsb2FkIHNob3dzIGEgMTB+MjAlIHJlZ3Jlc3Npb24g Y2F1c2VkIGJ5IGNvbW1pdA0KPj4+Pj44OTVlM2M1YzU4YTgwYmIuIGRpcmVjdElPIHVzdWFsbHkg aXMgcmFuZG9tIElPIGFuZCBpZiByZXF1ZXN0IHNpemUgaXNuJ3QgYmlnDQo+Pj4+Pih3aGljaCBp cyB0aGUgY29tbW9uIGNhc2UpLCBkZWxheSBoYW5kbGluZyBvZiB0aGUgc3RyaXBlIGhhc24ndCBh bnkgYWR2YW50YWdlcy4NCj4+Pj4+Rm9yIGJpZyBzaXplIHJlcXVlc3QsIGRlbGF5IGNhbiBzdGls bCByZWR1Y2UgSU8uDQo+Pj4+Pg0KPj4+Pj5TaWduZWQtb2ZmLWJ5OiBTaGFvaHVhIExpIDxzaGxp QGZ1c2lvbmlvLmNvbT4NCj4+IFtzbmlwXQ0KPj4+Pj4tLQ0KPj4+PiBNYXkgYmUgdXNlZCBzaXpl IHRvIGp1ZGdlIGlzIG5vdCBhIGdvb2QgbWV0aG9kLg0KPj4+PiBJIGZpcnN0bHkgc2VuZGVkIHRo aXMgcGF0Y2gsIG9ubHkgd2FudCB0byBjb250cm9sIGRpcmVjdC13cml0ZS1ibG9jayxub3QgZm9y IHJlcXVsYXIgZmlsZS4NCj4+Pj4gQmVjYXVzZSBpIHRoaW5rIGlmIHNvbWVvbmUgdXNlZCBkaXJl Y3Qtd3JpdGUtYmxvY2sgZm9yIHJhaWQ1LGhlIHNob3VsZCBrbm93IHRoZSBmZWF0dXJlIG9mIHJh aWQ1IGFuZCBoZSBjYW4gY29udHJvbA0KPj4+PiBmb3Igd3JpdGUgdG8gZnVsbC13cml0ZS4NCj4+ Pj4gQnV0IGF0IHRoYXQgdGltZSwgaSBkaWQga25vdyBob3cgdG8gZGlmZmVyZW50aWF0ZSBiZXR3 ZWVuIHJlZ3VsYXIgZmlsZSBhbmQgYmxvY2stZGV2aWNlLg0KPj4+PiBJIHRoaWsgd2Ugc2hvdWxk IGRvIHNvbWV0aGluZyB0byBkbyB0aGlzLg0KPj4+DQo+Pj5JIGRvbid0IHRoaW5rIGl0J3MgcG9z c2libGUgdXNlciBjYW4gY29udHJvbCBoaXMgd3JpdGUgdG8gYmUgYQ0KPj4+ZnVsbC13cml0ZSBl dmVuIGZvcg0KPj4+cmF3IGRpc2sgSU8uIFdoeSByZWd1bGFyIGZpbGUgYW5kIGJsb2NrIGRldmlj ZSBpbyBtYXR0ZXJzIGhlcmU/DQo+Pj4NCj4+PlRoYW5rcywNCj4+PlNoYW9odWENCj4+IEFub3Ro ZXIgcHJvYmxlbSBpcyB0aGUgc2l6ZS4gSG93IHRvIGp1ZGdlIHRoZSBzaXplIGlzIGxhcmdlIG9y IG5vdD8NCj4+IEEgc3lzY2FsbCB3cml0ZSBpcyBhIGRpbyBhbmQgYSBkaW8gbWF5IGJlIHNwbGl0 IG1vcmUgYmlvcy4NCj4+IEZvciBteSB3b3JrbG9hZCwgaSB1c3VhbHkgd3JpdGUgY2h1bmstc2l6 ZS4NCj4+IEJ1dCB5b3VyIHBhdGNoIGlzIGp1ZGdlIGJ5IGJpby1zaXplLg0KPg0KPkknZCBpZ25v cmUgd29ya2xvYWQgd2hpY2ggZG9lcyBzZXF1ZW50aWFsIGRpcmVjdElPLCB0aG91Z2gNCj55b3Vy IHdvcmtsb2FkIGlzLCBidXQgSSBiZXQgbm8gcmVhbCB3b3JrbG9hZHMgYXJlLiBTbyBJJ2QgbGlr ZQ0KU29ycnksbXkgZXhwbGFpbiBtYXliZSBub3QgY29yY3JlY3QuIEkgd3JpdGUgZGF0YSBvbmNl IHdoaWNoIHNpemUgaXMgYWxtb3N0IGNodW5rcy1zaXplICogZGV2aWNlcyxpbiBvcmRlciB0byBm dWxsLXdyaXRlIA0KYW5kIGFzIHBvc3NpYmxlIGFzIHRvIG5vIHByZS1yZWFkIG9wZXJhdGlvbi4N Cj5vbmx5IHRvIGNvbnNpZGVyIGJpZyBzaXplIHJhbmRvbSBkaXJlY3Rpby4gSSBhZ3JlZSB0aGUg c2l6ZQ0KPmp1ZGdlIGlzIGFyYml0cmFyeS4gSSBjYW4gb3B0aW1pemUgaXQgdG8gYmUgb25seSBj b25zaWRlciBzdHJpcGUNCj53aGljaCBoaXRzIHR3byBvciBtb3JlIGRpc2tzIGluIG9uZSBiaW8s IGJ1dCBub3Qgc3VyZSBpZiBpdCdzDQo+d29ydGh5IGRvaW5nLiBOb3Qgd2FyZSBiaWcgc2l6ZSBk aXJlY3RpbyBpcyBjb21tb24sIGFuZCBldmVuDQo+aXMsIGJpZyBzaXplIHJlcXVlc3QgSU9QUyBp cyBsb3csIGEgYml0IGRlbGF5IG1heWJlIG5vdCBhIGJpZw0KPmRlYWwuDQpJZiBhZGQgYSBhY2Nf dGltZSBmb3IgJ3N0cmllcF9oZWFkJyB0byBjb250cm9sPw0KV2hlbiBnZXRfYWN0aXZlX3N0cmlw ZSgpIGlzIG9rLCB1cGRhdGUgYWNjX3RpbWUuDQpGb3Igc29tZSB0aW1lLCBzdHJpcGVfaGVhZCBk aWQgbm90IGFjY2VzcyBhbmQgaXQgc2hvbGQgcHJlLXJlYWQu