From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Bart Van Assche To: "hch@infradead.org" , "linux-block@vger.kernel.org" , "snitzer@redhat.com" , "ming.lei@redhat.com" , "axboe@kernel.dk" CC: "dm-devel@redhat.com" , "linux-scsi@vger.kernel.org" , "jejb@linux.vnet.ibm.com" , "martin.petersen@oracle.com" , "loberman@redhat.com" Subject: Re: [PATCH V3] blk-mq: introduce BLK_STS_DEV_RESOURCE Date: Tue, 23 Jan 2018 16:24:20 +0000 Message-ID: <1516724659.3339.7.camel@sandisk.com> References: <20180123161613.14214-1-ming.lei@redhat.com> In-Reply-To: <20180123161613.14214-1-ming.lei@redhat.com> Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 List-ID: T24gV2VkLCAyMDE4LTAxLTI0IGF0IDAwOjE2ICswODAwLCBNaW5nIExlaSB3cm90ZToNCj4gQEAg LTEyODAsMTAgKzEyODIsMTggQEAgYm9vbCBibGtfbXFfZGlzcGF0Y2hfcnFfbGlzdChzdHJ1Y3Qg cmVxdWVzdF9xdWV1ZSAqcSwgc3RydWN0IGxpc3RfaGVhZCAqbGlzdCwNCj4gIAkJICogLSBTb21l IGJ1dCBub3QgYWxsIGJsb2NrIGRyaXZlcnMgc3RvcCBhIHF1ZXVlIGJlZm9yZQ0KPiAgCQkgKiAg IHJldHVybmluZyBCTEtfU1RTX1JFU09VUkNFLiBUd28gZXhjZXB0aW9ucyBhcmUgc2NzaS1tcQ0K PiAgCQkgKiAgIGFuZCBkbS1ycS4NCj4gKwkJICoNCj4gKwkJICogSWYgZHJpdmVycyByZXR1cm4g QkxLX1NUU19SRVNPVVJDRSBhbmQgU19TQ0hFRF9SRVNUQVJUDQo+ICsJCSAqIGJpdCBpcyBzZXQs IHJ1biBxdWV1ZSBhZnRlciAxMG1zIGZvciBhdm9pZGluZyBJTyBoYW5nDQo+ICsJCSAqIGJlY2F1 c2UgdGhlIHF1ZXVlIG1heSBiZSBpZGxlIGFuZCB0aGUgUkVTVEFSVCBtZWNoYW5pc20NCj4gKwkJ ICogY2FuJ3Qgd29yayBhbnkgbW9yZS4NCj4gIAkJICovDQo+IC0JCWlmICghYmxrX21xX3NjaGVk X25lZWRzX3Jlc3RhcnQoaGN0eCkgfHwNCj4gKwkJbmVlZHNfcmVzdGFydCA9IGJsa19tcV9zY2hl ZF9uZWVkc19yZXN0YXJ0KGhjdHgpOw0KPiArCQlpZiAoIW5lZWRzX3Jlc3RhcnQgfHwNCj4gIAkJ ICAgIChub190YWcgJiYgbGlzdF9lbXB0eV9jYXJlZnVsKCZoY3R4LT5kaXNwYXRjaF93YWl0LmVu dHJ5KSkpDQo+ICAJCQlibGtfbXFfcnVuX2h3X3F1ZXVlKGhjdHgsIHRydWUpOw0KPiArCQllbHNl IGlmIChuZWVkc19yZXN0YXJ0ICYmIChyZXQgPT0gQkxLX1NUU19SRVNPVVJDRSkpDQo+ICsJCQli bGtfbXFfZGVsYXlfcnVuX2h3X3F1ZXVlKGhjdHgsIDEwKTsNCj4gIAl9DQoNCk15IG9waW5pb24g YWJvdXQgdGhpcyBwYXRjaCBpcyBhcyBmb2xsb3dzOg0KKiBDaGFuZ2luZyBhIGJsa19tcV9kZWxh eV9ydW5faHdfcXVldWUoKSBjYWxsIGZvbGxvd2VkIGJ5IHJldHVybg0KICBCTEtfU1RTX0RFVl9S RVNPVVJDRSBpbnRvIHJldHVybiBCTEtfU1RTX1JFU09VUkNFIGlzIHdyb25nIGJlY2F1c2UgaXQg Y2hhbmdlcw0KICBhIGd1YXJhbnRlZWQgcXVldWUgcmVydW4gaW50byBhIHF1ZXVlIHJlcnVuIHRo YXQgbWF5IG9yIG1heSBub3QgaGFwcGVuDQogIGRlcGVuZGluZyBvbiB3aGV0aGVyIG9yIG5vdCBt dWx0aXBsZSBxdWV1ZSBydW5zIGhhcHBlbiBzaW11bHRhbmVvdXNseS4NCiogVGhpcyBjaGFuZ2Ug bWFrZXMgYmxvY2sgZHJpdmVycyBsZXNzIHJlYWRhYmxlIGJlY2F1c2UgYW55b25lIHdobyBlbmNv dW50ZXJzDQogIEJMS19TVFNfREVWX1JFU09VUkNFIHdpbGwgaGF2ZSB0byBsb29rIHVwIGl0cyBk ZWZpbml0aW9uIHRvIGZpZ3VyZSBvdXQgd2hhdA0KICBpdCdzIG1lYW5pbmcgaXMuDQoqIFdlIGRv bid0IG5lZWQgdGhlIG5ldyBzdGF0dXMgY29kZSBCTEtfU1RTX0RFVl9SRVNPVVJDRSBiZWNhdXNl IGEgZGVsYXllZA0KICBxdWV1ZSBydW4gY2FuIGJlIGltcGxlbWVudGVkIGVhc2lseSB3aXRoIHRo ZSBleGlzdGluZyBibG9jayBsYXllciBBUEkuDQoNCkJhcnQu