From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Bart Van Assche To: "ming.lei@redhat.com" CC: "linux-block@vger.kernel.org" , "hch@infradead.org" , "jthumshirn@suse.de" , "martin.petersen@oracle.com" , "linux-scsi@vger.kernel.org" , "axboe@fb.com" , "oleksandr@natalenko.name" , "jejb@linux.vnet.ibm.com" , "tj@kernel.org" Subject: Re: [PATCH V3 7/8] block: allow to allocate req with REQF_PREEMPT when queue is preempt frozen Date: Mon, 4 Sep 2017 15:40:35 +0000 Message-ID: <1504539634.3189.15.camel@wdc.com> References: <20170902130840.24609-1-ming.lei@redhat.com> <20170902130840.24609-8-ming.lei@redhat.com> <20170902131208.GA10940@ming.t460p> <1504498405.10804.10.camel@wdc.com> <20170904071653.GD7959@ming.t460p> In-Reply-To: <20170904071653.GD7959@ming.t460p> Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Sender: linux-scsi-owner@vger.kernel.org List-ID: T24gTW9uLCAyMDE3LTA5LTA0IGF0IDE1OjE2ICswODAwLCBNaW5nIExlaSB3cm90ZToNCj4gT24g TW9uLCBTZXAgMDQsIDIwMTcgYXQgMDQ6MTM6MjZBTSArMDAwMCwgQmFydCBWYW4gQXNzY2hlIHdy b3RlOg0KPiA+IEFsbG93aW5nIGJsa19nZXRfcmVxdWVzdCgpIHRvIHN1Y2NlZWQgYWZ0ZXIgdGhl IERZSU5HIGZsYWcgaGFzIGJlZW4gc2V0IGlzDQo+ID4gY29tcGxldGVseSB3cm9uZyBiZWNhdXNl IHRoYXQgY291bGQgcmVzdWx0IGluIGEgcmVxdWVzdCBiZWluZyBxdWV1ZWQgYWZ0ZXINCj4gPiB0 aGUgREVBRCBmbGFnIGhhcyBiZWVuIHNldCwgcmVzdWx0aW5nIGluIGVpdGhlciBhIGhhbmdpbmcg cmVxdWVzdCBvciBhIGtlcm5lbA0KPiA+IGNyYXNoLiBUaGlzIGlzIHdoeSBpdCdzIGNvbXBsZXRl bHkgd3JvbmcgdG8gYWRkIGEgYmxrX3F1ZXVlX2VudGVyX2xpdmUoKSBjYWxsDQo+ID4gaW4gYmxr X29sZF9nZXRfcmVxdWVzdCgpIG9yIGJsa19tcV9hbGxvY19yZXF1ZXN0KCkuIEhlbmNlIG15IE5B SyBmb3IgYW55DQo+ID4gcGF0Y2ggdGhhdCBhZGRzIGEgYmxrX3F1ZXVlX2VudGVyX2xpdmUoKSBj YWxsIHRvIGFueSBmdW5jdGlvbiBjYWxsZWQgZnJvbQ0KPiA+IGJsa19nZXRfcmVxdWVzdCgpLiBU aGF0IGluY2x1ZGVzIHRoZSBwYXRjaCBhdCB0aGUgc3RhcnQgb2YgdGhpcyBlLW1haWwgdGhyZWFk Lg0KPg0KPiBTZWUgYWJvdmUsIHRoaXMgcGF0Y2ggY2hhbmdlcyBub3RoaW5nIGFib3V0IHRoaXMg ZmFjdCwgcGxlYXNlIGxvb2sgYXQNCj4gdGhlIHBhdGNoIGNhcmVmdWxseSBuZXh0IHRpbWUganVz dCBiZWZvcmUgcG9zdGluZyB5b3VyIGxvbmcgY29tbWVudC4NCg0KQXJlIHlvdSByZWFsbHkgc3Vy ZSB0aGF0IHlvdXIgcGF0Y2ggZG9lcyBub3QgYWxsb3cgYmxrX2dldF9yZXF1ZXN0KCkgdG8NCnN1 Y2NlZWQgYWZ0ZXIgdGhlIERZSU5HIGZsYWcgaGFzIGJlZW4gc2V0PyBibGtfbXFfYWxsb2NfcmVx dWVzdCgpIGNhbGxzIGJvdGgNCmJsa19xdWV1ZV9pc19wcmVlbXB0X2Zyb3plbigpIGFuZCBibGtf cXVldWVfZW50ZXJfbGl2ZSgpIHdpdGhvdXQgaG9sZGluZw0KYW55IGxvY2suIEEgdGhyZWFkIHRo YXQgaXMgcnVubmluZyBjb25jdXJyZW50bHkgd2l0aCBibGtfbXFfZ2V0X3JlcXVlc3QoKQ0KY2Fu IHVuZnJlZXplIHRoZSBxdWV1ZSBhZnRlciBibGtfcXVldWVfaXNfcHJlZW1wdF9mcm96ZW4oKSBy ZXR1cm5lZCBhbmQNCmJlZm9yZSBibGtfcXVldWVfZW50ZXJfbGl2ZSgpIGlzIGNhbGxlZC4gVGhp cyBtZWFucyB0aGF0IHdpdGggeW91ciBwYXRjaA0Kc2VyaWVzIGFwcGxpZWQgYmxrX2dldF9yZXF1 ZXN0KCkgY2FuIHN1Y2NlZWQgYWZ0ZXIgdGhlIERZSU5HIGZsYWcgaGFzIGJlZW4NCnNldCwgd2hp Y2ggaXMgc29tZXRoaW5nIHdlIGRvbid0IHdhbnQuIEFkZGl0aW9uYWxseSwgSSBkb24ndCB0aGlu ayB3ZSB3YW50DQp0byBpbnRyb2R1Y2UgYW55IGtpbmQgb2YgbG9ja2luZyBpbiBibGtfbXFfZ2V0 X3JlcXVlc3QoKSBiZWNhdXNlIHRoYXQgd291bGQNCmJlIGEgc2VyaWFsaXphdGlvbiBwb2ludC4N Cg0KSGF2ZSB5b3UgY29uc2lkZXJlZCB0byB1c2UgdGhlIGJsay1tcSAicmVzZXJ2ZWQgcmVxdWVz dCIgbWVjaGFuaXNtIHRvIGF2b2lkDQpzdGFydmF0aW9uIG9mIHBvd2VyIG1hbmFnZW1lbnQgcmVx dWVzdHMgaW5zdGVhZCBvZiBtYWtpbmcgdGhlIGJsb2NrIGxheWVyDQpldmVuIG1vcmUgY29tcGxp Y2F0ZWQgdGhhbiBpdCBhbHJlYWR5IGlzPw0KDQpOb3RlOiBleHRlbmRpbmcgYmxrX21xX2ZyZWV6 ZS91bmZyZWV6ZV9xdWV1ZSgpIHRvIHRoZSBsZWdhY3kgYmxvY2sgbGF5ZXINCmNvdWxkIGJlIHVz ZWZ1bCB0byBtYWtlIHNjc2lfd2FpdF9mb3JfcXVldWVjb21tYW5kKCkgbW9yZSBlbGVnYW50LiBI b3dldmVyLA0KSSBkb24ndCB0aGluayB3ZSBzaG91bGQgc3BlbmQgb3VyIHRpbWUgb24gbGVnYWN5 IGJsb2NrIGxheWVyIC8gU0NTSSBjb3JlDQpjaGFuZ2VzLiBUaGUgY29kZSBJJ20gcmVmZXJyaW5n IHRvIGlzIHRoZSBmb2xsb3dpbmc6DQoNCi8qKg0KICogc2NzaV93YWl0X2Zvcl9xdWV1ZWNvbW1h bmQoKSAtIHdhaXQgZm9yIG9uZ29pbmcgcXVldWVjb21tYW5kKCkgY2FsbHMNCiAqIEBzZGV2OiBT Q1NJIGRldmljZSBwb2ludGVyLg0KICoNCiAqIFdhaXQgdW50aWwgdGhlIG9uZ29pbmcgc2hvc3Qt Pmhvc3R0LT5xdWV1ZWNvbW1hbmQoKSBjYWxscyB0aGF0IGFyZQ0KICogaW52b2tlZCBmcm9tIHNj c2lfcmVxdWVzdF9mbigpIGhhdmUgZmluaXNoZWQuDQogKi8NCnN0YXRpYyB2b2lkIHNjc2lfd2Fp dF9mb3JfcXVldWVjb21tYW5kKHN0cnVjdCBzY3NpX2RldmljZSAqc2RldikNCnsNCglXQVJOX09O X09OQ0Uoc2Rldi0+aG9zdC0+dXNlX2Jsa19tcSk7DQoNCgl3aGlsZSAoc2NzaV9yZXF1ZXN0X2Zu X2FjdGl2ZShzZGV2KSkNCgkJbXNsZWVwKDIwKTsNCn0NCg0KQmFydC4=