From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Jianpeng Ma" Subject: [PATCH] raid5: Avoid doing more read on dev of a stripe at the same time Date: Sat, 15 Sep 2012 10:20:35 +0800 Message-ID: <2012091510203206229010@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: Neil Brown Cc: linux-raid List-Id: linux-raid.ids SW4gZnVuYyAnb3BzX3J1bl9iaW8nIGlmIHlvdSByZWFkIHRoZSBkZXYgd2hpY2ggdGhlIGxhc3Qg cmVhZGluZw0Kb2YgdGhpcyBkZXYgZGlkbid0IHJldHVybixpdCB3aWxsIGRlc3Ryb3J5IHRoZSAg cmVxL3JyZXEnc291cmNlIG9mIHJkZXYuDQpJdCBtYXkgY2FsbCBodW5nLXRhc2suDQpGb3IgZXhh bXBsZSwgZm9yIGJhZHNlY3RvciBvciBvdGhlciByZWFzb25zLCByZWFkLW9wZXJhdGlvbiBvbmx5 IHVzZWQNCnN0cmlwZSBpbnN0ZWFkIG9mIGNodW5rX2FsaWduZWRfcmVhZC4NCkZpcnN0OnN0cmlw ZSAwO3NlY29uZDogc3RyaXBlIDg7dGhpcmQ6c3RyaXBlIDE2LkF0IHRoZSBibG9jay1sYXllcix0 aHJlZQ0KYmlvcyBtZXJnZWQuDQpCZWNhdXNlIG1lZGlhIGVycm9yIG9mIHNlY3RvciBmcm9tIDAg dG8gNywgdGhlIHJlcXVlc3QgcmV0cmllZC4NCkF0IHRoaXMgdGltZSwgcmFpZDVkIHJlYWRlZCBz dHJpcGUwIGFnYWluLkJ1dCBpdCB3aWxsIHNldCAnYmlvLT5uZXh0ID0NCk5VTEwnLlNvIHRoZSBz dHJpcGUgOCBhbmQgMTYgZGlkbid0IHJldHVybi4NCg0KU2lnbmVkLW9mZi1ieTogSmlhbnBlbmcg TWEgPG1hamlhbnBlbmdAZ21haWwuY29tPg0KLS0tDQogZHJpdmVycy9tZC9yYWlkNS5jIHwgICAx MyArKysrKysrKysrLS0tDQogZHJpdmVycy9tZC9yYWlkNS5oIHwgICAgMSArDQogMiBmaWxlcyBj aGFuZ2VkLCAxMSBpbnNlcnRpb25zKCspLCAzIGRlbGV0aW9ucygtKQ0KDQpkaWZmIC0tZ2l0IGEv ZHJpdmVycy9tZC9yYWlkNS5jIGIvZHJpdmVycy9tZC9yYWlkNS5jDQppbmRleCBhZGRhOTRkLi5l NTJiYTFiIDEwMDY0NA0KLS0tIGEvZHJpdmVycy9tZC9yYWlkNS5jDQorKysgYi9kcml2ZXJzL21k L3JhaWQ1LmMNCkBAIC01NDcsOSArNTQ3LDE0IEBAIHN0YXRpYyB2b2lkIG9wc19ydW5faW8oc3Ry dWN0IHN0cmlwZV9oZWFkICpzaCwgc3RydWN0IHN0cmlwZV9oZWFkX3N0YXRlICpzKQ0KIAkJCQly dyA9IFdSSVRFX0ZVQTsNCiAJCQllbHNlDQogCQkJCXJ3ID0gV1JJVEU7DQotCQl9IGVsc2UgaWYg KHRlc3RfYW5kX2NsZWFyX2JpdChSNV9XYW50cmVhZCwgJnNoLT5kZXZbaV0uZmxhZ3MpKQ0KLQkJ CXJ3ID0gUkVBRDsNCi0JCWVsc2UgaWYgKHRlc3RfYW5kX2NsZWFyX2JpdChSNV9XYW50UmVwbGFj ZSwNCisJCX0gZWxzZSBpZiAodGVzdF9hbmRfY2xlYXJfYml0KFI1X1dhbnRyZWFkLCAmc2gtPmRl dltpXS5mbGFncykpIHsNCisJCQkvKlRoZSBsYXN0IHJlYWQgZGlkIG5vdCByZXR1cm4sc28gc2tp cCB0aGlzIHJlYWQqLw0KKwkJCWlmICh0ZXN0X2FuZF9zZXRfYml0KFI1X1JlYWRpbmcsICZzaC0+ ZGV2W2ldLmZsYWdzKSkgew0KKwkJCQljbGVhcl9iaXQoUjVfTE9DS0VELCAmc2gtPmRldltpXS5m bGFncyk7DQorCQkJCWNvbnRpbnVlOw0KKwkJCX0gZWxzZQ0KKwkJCQlydyA9IFJFQUQ7DQorCQl9 IGVsc2UgaWYgKHRlc3RfYW5kX2NsZWFyX2JpdChSNV9XYW50UmVwbGFjZSwNCiAJCQkJCSAgICAm c2gtPmRldltpXS5mbGFncykpIHsNCiAJCQlydyA9IFdSSVRFOw0KIAkJCXJlcGxhY2Vfb25seSA9 IDE7DQpAQCAtNzAwLDYgKzcwNSw3IEBAIHN0YXRpYyB2b2lkIG9wc19ydW5faW8oc3RydWN0IHN0 cmlwZV9oZWFkICpzaCwgc3RydWN0IHN0cmlwZV9oZWFkX3N0YXRlICpzKQ0KIAkJCXByX2RlYnVn KCJza2lwIG9wICVsZCBvbiBkaXNjICVkIGZvciBzZWN0b3IgJWxsdVxuIiwNCiAJCQkJYmktPmJp X3J3LCBpLCAodW5zaWduZWQgbG9uZyBsb25nKXNoLT5zZWN0b3IpOw0KIAkJCWNsZWFyX2JpdChS NV9MT0NLRUQsICZzaC0+ZGV2W2ldLmZsYWdzKTsNCisJCQljbGVhcl9iaXQoUjVfUmVhZGluZywg JnNoLT5kZXZbaV0uZmxhZ3MpOw0KIAkJCXNldF9iaXQoU1RSSVBFX0hBTkRMRSwgJnNoLT5zdGF0 ZSk7DQogCQl9DQogCX0NCkBAIC0xODE4LDYgKzE4MjQsNyBAQCBzdGF0aWMgdm9pZCByYWlkNV9l bmRfcmVhZF9yZXF1ZXN0KHN0cnVjdCBiaW8gKiBiaSwgaW50IGVycm9yKQ0KIAl9DQogCXJkZXZf ZGVjX3BlbmRpbmcocmRldiwgY29uZi0+bWRkZXYpOw0KIAljbGVhcl9iaXQoUjVfTE9DS0VELCAm c2gtPmRldltpXS5mbGFncyk7DQorCWNsZWFyX2JpdChSNV9SZWFkaW5nLCAmc2gtPmRldltpXS5m bGFncyk7DQogCXNldF9iaXQoU1RSSVBFX0hBTkRMRSwgJnNoLT5zdGF0ZSk7DQogCXJlbGVhc2Vf c3RyaXBlKHNoKTsNCiB9DQpkaWZmIC0tZ2l0IGEvZHJpdmVycy9tZC9yYWlkNS5oIGIvZHJpdmVy cy9tZC9yYWlkNS5oDQppbmRleCBhOWZjMjQ5Li5hNTk2ZGY4IDEwMDY0NA0KLS0tIGEvZHJpdmVy cy9tZC9yYWlkNS5oDQorKysgYi9kcml2ZXJzL21kL3JhaWQ1LmgNCkBAIC0yOTgsNiArMjk4LDcg QEAgZW51bSByNWRldl9mbGFncyB7DQogCVI1X1dhbnRSZXBsYWNlLCAvKiBXZSBuZWVkIHRvIHVw ZGF0ZSB0aGUgcmVwbGFjZW1lbnQsIHdlIGhhdmUgcmVhZA0KIAkJCSAqIGRhdGEgaW4sIGFuZCBu b3cgaXMgYSBnb29kIHRpbWUgdG8gd3JpdGUgaXQgb3V0Lg0KIAkJCSAqLw0KKwlSNV9SZWFkaW5n LAkvKiB0aGlzIGRldiBvbiByZWFkaW5nIG9uIGxsZCovDQogfTsNCiANCiAvKg0KLS0gDQoxLjcu OS41DQo=