From mboxrd@z Thu Jan 1 00:00:00 1970 From: Bart Van Assche Subject: Re: [PATCH V4 08/10] block: allow to allocate req with RQF_PREEMPT when queue is preempt frozen Date: Mon, 11 Sep 2017 16:03:55 +0000 Message-ID: <1505145834.2802.17.camel@wdc.com> References: <20170911111021.25810-1-ming.lei@redhat.com> <20170911111021.25810-9-ming.lei@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Return-path: Received: from esa6.hgst.iphmx.com ([216.71.154.45]:2001 "EHLO esa6.hgst.iphmx.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750810AbdIKQEl (ORCPT ); Mon, 11 Sep 2017 12:04:41 -0400 In-Reply-To: <20170911111021.25810-9-ming.lei@redhat.com> Content-Language: en-US Content-ID: <882C71156A8CD54C9DC3FC175A362963@namprd04.prod.outlook.com> Sender: linux-scsi-owner@vger.kernel.org List-Id: linux-scsi@vger.kernel.org To: "linux-scsi@vger.kernel.org" , "hch@infradead.org" , "jejb@linux.vnet.ibm.com" , "linux-block@vger.kernel.org" , "axboe@fb.com" , "ming.lei@redhat.com" , "martin.petersen@oracle.com" Cc: Bart Van Assche , "jthumshirn@suse.de" , "oleksandr@natalenko.name" , "cavery@redhat.com" T24gTW9uLCAyMDE3LTA5LTExIGF0IDE5OjEwICswODAwLCBNaW5nIExlaSB3cm90ZToNCj4gQEAg LTc4Nyw2ICs3ODcsMzUgQEAgaW50IGJsa19xdWV1ZV9lbnRlcihzdHJ1Y3QgcmVxdWVzdF9xdWV1 ZSAqcSwgdW5zaWduZWQgZmxhZ3MpDQo+ICAJCWlmIChwZXJjcHVfcmVmX3RyeWdldF9saXZlKCZx LT5xX3VzYWdlX2NvdW50ZXIpKQ0KPiAgCQkJcmV0dXJuIDA7DQo+ICANCj4gKwkJLyoNCj4gKwkJ ICogSWYgcXVldWUgaXMgcHJlZW1wdCBmcm96ZW4gYW5kIGNhbGxlciBuZWVkIHRvIGFsbG9jYXRl DQo+ICsJCSAqIHJlcXVlc3QgZm9yIFJRRl9QUkVFTVBULCB3ZSBncmFiIHRoZSAucV91c2FnZV9j b3VudGVyDQo+ICsJCSAqIHVuY29uZGl0aW9uYWxseSBhbmQgcmV0dXJuIHN1Y2Nlc3NmdWxseS4N Cj4gKwkJICoNCj4gKwkJICogVGhlcmUgaXNuJ3QgcmFjZSB3aXRoIHF1ZXVlIGNsZWFudXAgYmVj YXVzZToNCj4gKwkJICoNCj4gKwkJICogMSkgaXQgaXMgZ3VhcmFudGVlZCB0aGF0IHByZWVtcHQg ZnJlZXplIGNhbid0IGJlDQo+ICsJCSAqIHN0YXJ0ZWQgYWZ0ZXIgcXVldWUgaXMgc2V0IGFzIGR5 aW5nDQo+ICsJCSAqDQo+ICsJCSAqIDIpIG5vcm1hbCBmcmVlemUgcnVucyBleGNsdXNpdmVseSB3 aXRoIHByZWVtcHQNCj4gKwkJICogZnJlZXplLCBzbyBldmVuIGFmdGVyIHF1ZXVlIGlzIHNldCBh cyBkeWluZw0KPiArCQkgKiBhZnRlcndhcmRzLCBibGtfcXVldWVfY2xlYW51cCgpIHdvbid0IG1v dmUgb24NCj4gKwkJICogdW50aWwgcHJlZW1wdCBmcmVlemUgaXMgZG9uZQ0KPiArCQkgKg0KPiAr CQkgKiAzKSBibGtfcXVldWVfZHlpbmcoKSBuZWVkbid0IHRvIGJlIGNoZWNrZWQgaGVyZQ0KPiAr CQkgKiAJLSBmb3IgbGVnYWN5IHBhdGgsIGl0IHdpbGwgYmUgY2hlY2tlZCBpbg0KPiArCQkgKiAJ X19nZXRfcmVxdWVzdCgpDQoNCkZvciB0aGUgbGVnYWN5IGJsb2NrIGxheWVyIGNvcmUsIHdoYXQg ZG8geW91IHRoaW5rIHdpbGwgaGFwcGVuIGlmIHRoZQ0KImR5aW5nIiBzdGF0ZSBpcyBzZXQgYnkg YW5vdGhlciB0aHJlYWQgYWZ0ZXIgX19nZXRfcmVxdWVzdCgpIGhhcyBwYXNzZWQgdGhlDQpibGtf cXVldWVfZHlpbmcoKSBjaGVjaz8NCg0KPiArCQkgKiAJLSBibGstbXEgZGVwZW5kcyBvbiBkcml2 ZXIgdG8gaGFuZGxlIGR5aW5nIHdlbGwNCj4gKwkJICogCWJlY2F1c2UgaXQgaXMgbm9ybWFsIGZv ciBxdWV1ZSB0byBiZSBzZXQgYXMgZHlpbmcNCj4gKwkJICogCWp1c3QgYmV0d2VlbiBibGtfcXVl dWVfZW50ZXIoKSBhbmQgYWxsb2NhdGluZyBuZXcNCj4gKwkJICogCXJlcXVlc3QuDQoNClRoZSBh Ym92ZSBjb21tZW50IGlzIG5vdCBjb3JyZWN0LiBUaGUgYmxvY2sgbGF5ZXIgY29yZSBoYW5kbGVz IHRoZSAiZHlpbmciDQpzdGF0ZS4gQmxvY2sgZHJpdmVycyBvdGhlciB0aGFuIGRtLW1wYXRoIHNo b3VsZCBub3QgaGF2ZSB0byBxdWVyeSB0aGlzIHN0YXRlDQpkaXJlY3RseS4NCg0KPiArCQkgKi8N Cj4gKwkJaWYgKChmbGFncyAmIEJMS19SRVFfUFJFRU1QVCkgJiYNCj4gKwkJCQlibGtfcXVldWVf aXNfcHJlZW1wdF9mcm96ZW4ocSkpIHsNCj4gKwkJCWJsa19xdWV1ZV9lbnRlcl9saXZlKHEpOw0K PiArCQkJcmV0dXJuIDA7DQo+ICsJCX0NCj4gKw0KDQpTb3JyeSBidXQgdG8gbWUgaXQgbG9va3Mg bGlrZSB0aGUgYWJvdmUgY29kZSBpbnRyb2R1Y2VzIGEgcmFjZSBjb25kaXRpb24NCmJldHdlZW4g YmxrX3F1ZXVlX2NsZWFudXAoKSBhbmQgYmxrX2dldF9yZXF1ZXN0KCkgZm9yIGF0IGxlYXN0IGJs ay1tcS4NCkNvbnNpZGVyIGUuZy4gdGhlIGZvbGxvd2luZyBzY2VuYXJpbzoNCiogQSBmaXJzdCB0 aHJlYWQgcHJlZW1wdC1mcmVlemVzIGEgcmVxdWVzdCBxdWV1ZS4NCiogQSBzZWNvbmQgdGhyZWFk IGNhbGxzIGJsa19nZXRfcmVxdWVzdCgpIHdpdGggQkxLX1JFUV9QUkVFTVBUIHNldC4gVGhhdA0K ICByZXN1bHRzIGluIGEgY2FsbCBvZiBibGtfcXVldWVfaXNfcHJlZW1wdF9mcm96ZW4oKS4NCiog QSBjb250ZXh0IHN3aXRjaCBvY2N1cnMgdG8gdGhlIGZpcnN0IHRocmVhZC4NCiogVGhlIGZpcnN0 IHRocmVhZCBwcmVlbXB0LXVuZnJlZXplcyB0aGUgc2FtZSByZXF1ZXN0IHF1ZXVlIGFuZCBjYWxs cw0KICBibGtfcXVldWVfY2xlYW51cCgpLiBUaGF0IGxhc3QgZnVuY3Rpb24gY2hhbmdlcyB0aGUg cmVxdWVzdCBxdWV1ZSBzdGF0ZQ0KICBpbnRvIERZSU5HIGFuZCB3YWl0cyB1bnRpbCBhbGwgcGVu ZGluZyByZXF1ZXN0cyBoYXZlIGZpbmlzaGVkLg0KKiBUaGUgc2Vjb25kIHRocmVhZCBjb250aW51 ZXMgYW5kIGNhbGxzIGJsa19xdWV1ZV9lbnRlcl9saXZlKCksIGFsbG9jYXRlcw0KICBhIHJlcXVl c3QgYW5kIHN1Ym1pdHMgaXQuDQoNCkluIG90aGVyIHdvcmRzLCBhIHJlcXVlc3QgZ2V0cyBzdWJt aXR0ZWQgYWdhaW5zdCBhIGR5aW5nIHF1ZXVlLiBUaGlzIG11c3QNCm5vdCBoYXBwZW4uIFNlZSBh bHNvIG15IGV4cGxhbmF0aW9uIG9mIHF1ZXVlIHNodXRkb3duIGZyb20gYSBmZXcgZGF5cyBhZ28N CihodHRwczovL21hcmMuaW5mby8/bD1saW51eC1ibG9jayZtPTE1MDQ0OTg0NTgzMTc4OSkuDQoN CkJhcnQu