From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Bart Van Assche To: "snitzer@redhat.com" , "axboe@kernel.dk" CC: "dm-devel@redhat.com" , "linux-scsi@vger.kernel.org" , "linux-block@vger.kernel.org" , "linux-nvme@lists.infradead.org" Subject: Re: [PATCH V4] blk-mq: introduce BLK_STS_DEV_RESOURCE Date: Mon, 29 Jan 2018 21:22:13 +0000 Message-ID: <1517260932.2687.42.camel@wdc.com> References: <20180129203300.50595-1-snitzer@redhat.com> In-Reply-To: <20180129203300.50595-1-snitzer@redhat.com> Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 List-ID: T24gTW9uLCAyMDE4LTAxLTI5IGF0IDE1OjMzIC0wNTAwLCBNaWtlIFNuaXR6ZXIgd3JvdGU6DQo+ ICsJCSAqIElmIGRyaXZlciByZXR1cm5zIEJMS19TVFNfUkVTT1VSQ0UgYW5kIFNDSEVEX1JFU1RB UlQNCj4gKwkJICogYml0IGlzIHNldCwgcnVuIHF1ZXVlIGFmdGVyIDEwbXMgdG8gYXZvaWQgSU8g c3RhbGxzDQo+ICsJCSAqIHRoYXQgY291bGQgb3RoZXJ3aXNlIG9jY3VyIGlmIHRoZSBxdWV1ZSBp cyBpZGxlLg0KPiAgCQkgKi8NCj4gLQkJaWYgKCFibGtfbXFfc2NoZWRfbmVlZHNfcmVzdGFydCho Y3R4KSB8fA0KPiArCQluZWVkc19yZXN0YXJ0ID0gYmxrX21xX3NjaGVkX25lZWRzX3Jlc3RhcnQo aGN0eCk7DQo+ICsJCWlmICghbmVlZHNfcmVzdGFydCB8fA0KPiAgCQkgICAgKG5vX3RhZyAmJiBs aXN0X2VtcHR5X2NhcmVmdWwoJmhjdHgtPmRpc3BhdGNoX3dhaXQuZW50cnkpKSkNCj4gIAkJCWJs a19tcV9ydW5faHdfcXVldWUoaGN0eCwgdHJ1ZSk7DQo+ICsJCWVsc2UgaWYgKG5lZWRzX3Jlc3Rh cnQgJiYgKHJldCA9PSBCTEtfU1RTX1JFU09VUkNFKSkNCj4gKwkJCWJsa19tcV9kZWxheV9ydW5f aHdfcXVldWUoaGN0eCwgQkxLX01RX1FVRVVFX0RFTEFZKTsNCj4gIAl9DQoNClRoZSBhYm92ZSBj b2RlIG9ubHkgY2FsbHMgYmxrX21xX2RlbGF5X3J1bl9od19xdWV1ZSgpIGlmIHRoZSBmb2xsb3dp bmcgY29uZGl0aW9uDQppcyBtZXQ6ICEoIW5lZWRzX3Jlc3RhcnQgfHwgKG5vX3RhZyAmJiBsaXN0 X2VtcHR5X2NhcmVmdWwoJmhjdHgtPmRpc3BhdGNoX3dhaXQuZW50cnkpKSkNCiYmIChuZWVkc19y ZXN0YXJ0ICYmIChyZXQgPT0gQkxLX1NUU19SRVNPVVJDRSkpLiBUaGF0IGJvb2xlYW4gZXhwcmVz c2lvbiBjYW4gYmUNCnNpbXBsaWZpZWQgaW50byB0aGUgZm9sbG93aW5nOiBuZWVkc19yZXN0YXJ0 ICYmIHJldCA9PSBCTEtfU1RTX1JFU09VUkNFICYmIA0KIShub190YWcgJiYgbGlzdF9lbXB0eV9j YXJlZnVsKCZoY3R4LT5kaXNwYXRjaF93YWl0LmVudHJ5KSkuIEZyb20gYmxrLW1xLXNjaGVkLmg6 DQoNCnN0YXRpYyBpbmxpbmUgYm9vbCBibGtfbXFfc2NoZWRfbmVlZHNfcmVzdGFydChzdHJ1Y3Qg YmxrX21xX2h3X2N0eCAqaGN0eCkNCnsNCglyZXR1cm4gdGVzdF9iaXQoQkxLX01RX1NfU0NIRURf UkVTVEFSVCwgJmhjdHgtPnN0YXRlKTsNCn0NCg0KSW4gb3RoZXIgd29yZHMsIHRoZSBhYm92ZSBj b2RlIHdpbGwgbm90IGNhbGwgYmxrX21xX2RlbGF5X3J1bl9od19xdWV1ZSgpIGlmDQpCTEtfTVFf U19TQ0hFRF9SRVNUQVJUIGlzIGNsZWFyZWQgYWZ0ZXIgaXQgZ290IHNldCBhbmQgYmVmb3JlIHRo ZSBhYm92ZSBjb2RlIGlzDQpyZWFjaGVkLiBUaGUgQkxLX01RX1NfU0NIRURfUkVTVEFSVCBiaXQg Z2V0cyBjbGVhcmVkIGlmIGEgcmVxdWVzdCBjb21wbGV0ZXMNCmNvbmN1cnJlbnRseSB3aXRoIHRo ZSBhYm92ZSBjb2RlLiBGcm9tIGJsay1tcS1zY2hlZC5jOg0KDQpzdGF0aWMgYm9vbCBibGtfbXFf c2NoZWRfcmVzdGFydF9oY3R4KHN0cnVjdCBibGtfbXFfaHdfY3R4ICpoY3R4KQ0Kew0KCWlmICgh dGVzdF9iaXQoQkxLX01RX1NfU0NIRURfUkVTVEFSVCwgJmhjdHgtPnN0YXRlKSkNCgkJcmV0dXJu IGZhbHNlOw0KDQoJaWYgKGhjdHgtPmZsYWdzICYgQkxLX01RX0ZfVEFHX1NIQVJFRCkgew0KCQlz dHJ1Y3QgcmVxdWVzdF9xdWV1ZSAqcSA9IGhjdHgtPnF1ZXVlOw0KDQoJCWlmICh0ZXN0X2FuZF9j bGVhcl9iaXQoQkxLX01RX1NfU0NIRURfUkVTVEFSVCwgJmhjdHgtPnN0YXRlKSkNCgkJCWF0b21p Y19kZWMoJnEtPnNoYXJlZF9oY3R4X3Jlc3RhcnQpOw0KCX0gZWxzZQ0KCQljbGVhcl9iaXQoQkxL X01RX1NfU0NIRURfUkVTVEFSVCwgJmhjdHgtPnN0YXRlKTsNCg0KCXJldHVybiBibGtfbXFfcnVu X2h3X3F1ZXVlKGhjdHgsIHRydWUpOw0KfQ0KDQpUaGUgYWJvdmUgYmxrX21xX3J1bl9od19xdWV1 ZSgpIGNhbGwgbWF5IGZpbmlzaCBlaXRoZXIgYmVmb3JlIG9yIGFmdGVyDQpibGtfbXFfZGlzcGF0 Y2hfcnFfbGlzdCgpIGV4YW1pbmVzIHRoZSBCTEtfTVFfU19TQ0hFRF9SRVNUQVJUIGZsYWcuDQoN ClRoYXQncyB3aHkgSSB3cm90ZSBpbiBwcmV2aW91cyBlLW1haWxzIHRoYXQgdGhpcyBwYXRjaCBh bmQgYWxzbyB0aGUgcHJldmlvdXMNCnZlcnNpb25zIG9mIHRoaXMgcGF0Y2ggY2hhbmdlIGEgc3lz dGVtYXRpYyBjYWxsIG9mIGJsa19tcV9kZWxheV9ydW5faHdfcXVldWUoKQ0KaW50byBhIGNhbGwg dGhhdCBtYXkgb3IgbWF5IG5vdCBoYXBwZW4sIGRlcGVuZGluZyBvbiB3aGV0aGVyIG9yIG5vdCBh IHJlcXVlc3QNCmNvbXBsZXRlcyBjb25jdXJyZW50bHkgd2l0aCByZXF1ZXN0IHF1ZXVlaW5nLiBT b3JyeSBidXQgSSB0aGluayB0aGF0IG1lYW5zDQp0aGF0IHRoZSBhYm92ZSBjaGFuZ2UgY29tYmlu ZWQgd2l0aCBjaGFuZ2luZyBCTEtfU1RTX1JFU09VUkNFIGludG8NCkJMS19TVFNfREVWX1JFU09V UkNFIGlzIHdyb25nIGFuZCB3aHkgSSBleHBlY3QgdGhhdCB0aGlzIHdpbGwgcmVzdWx0IGluDQpz cG9yYWRpYyBxdWV1ZSBzdGFsbHMuIEFzIHlvdSBrbm93IHNwb3JhZGljIHF1ZXVlIHN0YWxscyBh cmUgYW5ub3lpbmcgYW5kIGhhcmQNCnRvIGRlYnVnLg0KDQpQbGVudHkgb2YgZS1tYWlscyBoYXZl IGFscmVhZHkgYmVlbiBleGNoYW5nZWQgYWJvdXQgdmVyc2lvbnMgb25lIHRvIGZvdXIgb2YgdGhp cw0KcGF0Y2ggYnV0IHNvIGZhciBub2JvZHkgaGFzIGV2ZW4gdHJpZWQgdG8gY29udHJhZGljdCB0 aGUgYWJvdmUuDQoNCkJhcnQu