From mboxrd@z Thu Jan 1 00:00:00 1970 From: majianpeng Subject: [RFC PATCH V1] raid5: Add R5_ReadNoMerge flag which prevent bio from merging at block layer Date: Fri, 13 Jul 2012 19:13:35 +0800 Message-ID: <201207131913329371733@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 QmVjYXVzZSBiaW9zIHdpbGwgbWVyZ2UgYXQgYmxvY2stbGF5ZXIsc28gYmlvcy1lcnJvciBtYXkg Y2F1c2VkIGJ5IG90aGVyDQpiaW8gd2hpY2ggYmUgbWVyZ2VkIGludG8gdG8gdGhlIHNhbWUgcmVx dWVzdC4NClVzaW5nIHRoaXMgZmxhZyxpdCB3aWxsIGZpbmQgZXhhY3RseSBlcnJvci1zZWN0b3Ig YW5kIG5vdCBkbyByZWR1bmRhbnQNCm9wZXJhdGlvbiBsaWtlIHJlLXdyaXRlIGFuZCByZS1yZWFk Lg0KDQpWMC0+VjE6VXNpbmcgUkVRX0ZMVVNIIGluc3RlYWQgUkVRX05PTUVSR0UgYXZvaWQgYmlv IG1lcmdpbmcgYXQgYmxvY2sNCmxheWVyLg0KDQpTaWduZWQtb2ZmLWJ5OiBKaWFucGVuZyBNYSA8 bWFqaWFucGVuZ0BnbWFpbC5jb20+DQotLS0NCiBkcml2ZXJzL21kL3JhaWQ1LmMgfCAgIDE0ICsr KysrKysrKysrKy0tDQogZHJpdmVycy9tZC9yYWlkNS5oIHwgICAgMSArDQogMiBmaWxlcyBjaGFu Z2VkLCAxMyBpbnNlcnRpb25zKCspLCAyIGRlbGV0aW9ucygtKQ0KDQpkaWZmIC0tZ2l0IGEvZHJp dmVycy9tZC9yYWlkNS5jIGIvZHJpdmVycy9tZC9yYWlkNS5jDQppbmRleCAwNDM0OGQ3Li4wNTk5 ODlmNiAxMDA2NDQNCi0tLSBhL2RyaXZlcnMvbWQvcmFpZDUuYw0KKysrIGIvZHJpdmVycy9tZC9y YWlkNS5jDQpAQCAtNjQwLDYgKzY0MCw5IEBAIHN0YXRpYyB2b2lkIG9wc19ydW5faW8oc3RydWN0 IHN0cmlwZV9oZWFkICpzaCwgc3RydWN0IHN0cmlwZV9oZWFkX3N0YXRlICpzKQ0KIAkJCWVsc2UN CiAJCQkJYmktPmJpX3NlY3RvciA9IChzaC0+c2VjdG9yDQogCQkJCQkJICsgcmRldi0+ZGF0YV9v ZmZzZXQpOw0KKwkJCWlmICh0ZXN0X2JpdChSNV9SZWFkTm9NZXJnZSwgJnNoLT5kZXZbaV0uZmxh Z3MpKQ0KKwkJCQliaS0+YmlfcncgfD0gUkVRX0ZMVVNIOw0KKw0KIAkJCWJpLT5iaV9mbGFncyA9 IDEgPDwgQklPX1VQVE9EQVRFOw0KIAkJCWJpLT5iaV9pZHggPSAwOw0KIAkJCWJpLT5iaV9pb192 ZWNbMF0uYnZfbGVuID0gU1RSSVBFX1NJWkU7DQpAQCAtMTczOSw3ICsxNzQyLDkgQEAgc3RhdGlj IHZvaWQgcmFpZDVfZW5kX3JlYWRfcmVxdWVzdChzdHJ1Y3QgYmlvICogYmksIGludCBlcnJvcikN CiAJCQlhdG9taWNfYWRkKFNUUklQRV9TRUNUT1JTLCAmcmRldi0+Y29ycmVjdGVkX2Vycm9ycyk7 DQogCQkJY2xlYXJfYml0KFI1X1JlYWRFcnJvciwgJnNoLT5kZXZbaV0uZmxhZ3MpOw0KIAkJCWNs ZWFyX2JpdChSNV9SZVdyaXRlLCAmc2gtPmRldltpXS5mbGFncyk7DQotCQl9DQorCQl9IGVsc2Ug aWYgKHRlc3RfYml0KFI1X1JlYWROb01lcmdlLCAmc2gtPmRldltpXS5mbGFncykpDQorCQkJY2xl YXJfYml0KFI1X1JlYWROb01lcmdlLCAmc2gtPmRldltpXS5mbGFncyk7DQorDQogCQlpZiAoYXRv bWljX3JlYWQoJnJkZXYtPnJlYWRfZXJyb3JzKSkNCiAJCQlhdG9taWNfc2V0KCZyZGV2LT5yZWFk X2Vycm9ycywgMCk7DQogCX0gZWxzZSB7DQpAQCAtMTc4NCw3ICsxNzg5LDExIEBAIHN0YXRpYyB2 b2lkIHJhaWQ1X2VuZF9yZWFkX3JlcXVlc3Qoc3RydWN0IGJpbyAqIGJpLCBpbnQgZXJyb3IpDQog CQllbHNlDQogCQkJcmV0cnkgPSAxOw0KIAkJaWYgKHJldHJ5KQ0KLQkJCXNldF9iaXQoUjVfUmVh ZEVycm9yLCAmc2gtPmRldltpXS5mbGFncyk7DQorCQkJaWYgKHRlc3RfYml0KFI1X1JlYWROb01l cmdlLCAmc2gtPmRldltpXS5mbGFncykpIHsNCisJCQkJc2V0X2JpdChSNV9SZWFkRXJyb3IsICZz aC0+ZGV2W2ldLmZsYWdzKTsNCisJCQkJY2xlYXJfYml0KFI1X1JlYWROb01lcmdlLCAmc2gtPmRl dltpXS5mbGFncyk7DQorCQkJfSBlbHNlDQorCQkJCXNldF9iaXQoUjVfUmVhZE5vTWVyZ2UsICZz aC0+ZGV2W2ldLmZsYWdzKTsNCiAJCWVsc2Ugew0KIAkJCWNsZWFyX2JpdChSNV9SZWFkRXJyb3Is ICZzaC0+ZGV2W2ldLmZsYWdzKTsNCiAJCQljbGVhcl9iaXQoUjVfUmVXcml0ZSwgJnNoLT5kZXZb aV0uZmxhZ3MpOw0KQEAgLTQ1MDQsNiArNDUxMyw3IEBAIHN0YXRpYyBpbnQgIHJldHJ5X2FsaWdu ZWRfcmVhZChzdHJ1Y3QgcjVjb25mICpjb25mLCBzdHJ1Y3QgYmlvICpyYWlkX2JpbykNCiAJCQly ZXR1cm4gaGFuZGxlZDsNCiAJCX0NCiANCisJCXNldF9iaXQoUjVfUmVhZE5vTWVyZ2UsICZzaC0+ ZGV2W2RkX2lkeF0uZmxhZ3MpOw0KIAkJaGFuZGxlX3N0cmlwZShzaCk7DQogCQlyZWxlYXNlX3N0 cmlwZShzaCk7DQogCQloYW5kbGVkKys7DQpkaWZmIC0tZ2l0IGEvZHJpdmVycy9tZC9yYWlkNS5o IGIvZHJpdmVycy9tZC9yYWlkNS5oDQppbmRleCAyMTY0MDIxLi42NzY3ZDA3IDEwMDY0NA0KLS0t IGEvZHJpdmVycy9tZC9yYWlkNS5oDQorKysgYi9kcml2ZXJzL21kL3JhaWQ1LmgNCkBAIC0yNzMs NiArMjczLDcgQEAgZW51bSByNWRldl9mbGFncyB7DQogCVI1X1dhbnR3cml0ZSwNCiAJUjVfT3Zl cmxhcCwJLyogVGhlcmUgaXMgYSBwZW5kaW5nIG92ZXJsYXBwaW5nIHJlcXVlc3QNCiAJCQkgKiBv biB0aGlzIGJsb2NrICovDQorCVI1X1JlYWROb01lcmdlLCAvKiBwcmV2ZW50IGJpbyBmcm9tIG1l cmdpbmcgaW4gYmxvY2stbGF5ZXIgKi8NCiAJUjVfUmVhZEVycm9yLAkvKiBzZWVuIGEgcmVhZCBl cnJvciBoZXJlIHJlY2VudGx5ICovDQogCVI1X1JlV3JpdGUsCS8qIGhhdmUgdHJpZWQgdG8gb3Zl ci13cml0ZSB0aGUgcmVhZGVycm9yICovDQogDQotLSANCjEuNy41LjQNCg==