From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Bart Van Assche To: "axboe@kernel.dk" CC: "hch@lst.de" , "linux-block@vger.kernel.org" , "hare@suse.de" , "jthumshirn@suse.de" Subject: Re: [PATCH 2/7] block: Document more locking requirements Date: Fri, 1 Dec 2017 17:05:28 +0000 Message-ID: <1512147926.2520.11.camel@wdc.com> References: <20171201000848.2656-1-bart.vanassche@wdc.com> <20171201000848.2656-3-bart.vanassche@wdc.com> In-Reply-To: Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 List-ID: T24gVGh1LCAyMDE3LTExLTMwIGF0IDIwOjAzIC0wNzAwLCBKZW5zIEF4Ym9lIHdyb3RlOg0KPiBP biAxMS8zMC8yMDE3IDA1OjA4IFBNLCBCYXJ0IFZhbiBBc3NjaGUgd3JvdGU6DQo+ID4gVGhpcyBw YXRjaCBkb2VzIG5vdCBjaGFuZ2UgYW55IGZ1bmN0aW9uYWxpdHkuDQo+IA0KPiBVbmxlc3MgdGhl c2UgYWN0dWFsbHkgZm91bmQgcmVhbCBidWdzLCBJIHRoaW5rIGl0J3MgcG9pbnRsZXNzLg0KPiBB ZGQgYSBjb21tZW50Lg0KIA0KSGVsbG8gSmVucywNCg0KQXMgeW91IGtub3cgbG9ja2RlcF9hc3Nl cnRfaGVsZCgpIHN0YXRlbWVudHMgYXJlIHZlcmlmaWVkIGF0IHJ1bnRpbWUgd2l0aA0KTE9DS0RF UCBlbmFibGVkIGJ1dCBjb21tZW50cyBub3QuIEhlbmNlIG15IHByZWZlcmVuY2UgZm9yIGxvY2tk ZXBfYXNzZXJ0X2hlbGQoKQ0Kb3ZlciBzb3VyY2UgY29kZSBjb21tZW50cy4NCg0KPiBBbmQgdGhp czoNCj4NCj4gPiBAQCAtMTAwMyw5ICsxMDA3LDE0IEBAIGJvb2wgYmxrX21xX2dldF9kcml2ZXJf dGFnKHN0cnVjdCByZXF1ZXN0ICpycSwgc3RydWN0IGJsa19tcV9od19jdHggKipoY3R4LA0KPiA+ ICBzdGF0aWMgaW50IGJsa19tcV9kaXNwYXRjaF93YWtlKHdhaXRfcXVldWVfZW50cnlfdCAqd2Fp dCwgdW5zaWduZWQgbW9kZSwNCj4gPiAgCQkJCWludCBmbGFncywgdm9pZCAqa2V5KQ0KPiA+ICB7 DQo+ID4gLQlzdHJ1Y3QgYmxrX21xX2h3X2N0eCAqaGN0eDsNCj4gPiArCXN0cnVjdCBibGtfbXFf aHdfY3R4ICpoY3R4ID0NCj4gPiArCQljb250YWluZXJfb2Yod2FpdCwgc3RydWN0IGJsa19tcV9o d19jdHgsIGRpc3BhdGNoX3dhaXQpOw0KPiA+ICsNCj4gPiArI2lmZGVmIENPTkZJR19MT0NLREVQ DQo+ID4gKwlzdHJ1Y3Qgc2JxX3dhaXRfc3RhdGUgKndzID0gYnRfd2FpdF9wdHIoJmhjdHgtPnRh Z3MtPmJpdG1hcF90YWdzLCBoY3R4KTsNCj4gPiAgDQo+ID4gLQloY3R4ID0gY29udGFpbmVyX29m KHdhaXQsIHN0cnVjdCBibGtfbXFfaHdfY3R4LCBkaXNwYXRjaF93YWl0KTsNCj4gPiArCWxvY2tk ZXBfYXNzZXJ0X2hlbGQoJndzLT53YWl0LmxvY2spOw0KPiA+ICsjZW5kaWYNCj4gDQo+IHdlJ3Jl IGRlZmluaXRlbHkgbm90IGRvaW5nLg0KDQpDYW4geW91IGV4cGxhaW4gbWUgd2h5IHlvdSB0aGlu ayB0aGUgYWJvdmUgaXMgd3Jvbmc/IE15IHVuZGVyc3RhbmRpbmcgaXMNCnRoYXQgdGhlIGNhbGwg Y2hhaW4gZm9yIHRoZSBhYm92ZSBmdW5jdGlvbiBpcyBhcyBmb2xsb3dzOg0KDQpibGtfbXFfdGFn X3dha2V1cF9hbGwoKQ0KLT4gc2JpdG1hcF9xdWV1ZV93YWtlX2FsbCgpDQogIC0+IHdha2VfdXAo KQ0KICAgIC0+IF9fd2FrZV91cCgpDQogICAgICAtPiBfX3dha2VfdXBfY29tbW9uX2xvY2soKQ0K ICAgICAgICAtPiBzcGluX2xvY2tfaXJxc2F2ZSgmd3FfaGVhZC0+bG9jaywgZmxhZ3MpOw0KICAg ICAgICAtPiBfX3dha2VfdXBfY29tbW9uKCkNCiAgICAgICAgICAtPiBsaXN0X2Zvcl9lYWNoX2Vu dHJ5X3NhZmVfZnJvbShjdXJyLCBuZXh0LCAmd3FfaGVhZC0+aGVhZCwgZW50cnkpDQogICAgICAg ICAgLT4gICByZXQgPSBjdXJyLT5mdW5jKGN1cnIsIG1vZGUsIHdha2VfZmxhZ3MsIGtleSkNCiAg ICAgICAgLT4gc3Bpbl91bmxvY2tfaXJxcmVzdG9yZSgmd3FfaGVhZC0+bG9jaywgZmxhZ3MpOw0K DQpJbiBvdGhlciB3b3JkcywgYmxrX21xX2Rpc3BhdGNoX3dha2UoKSBpcyBjYWxsZWQgd2l0aCB0 aGUgd2FpdCBxdWV1ZSBoZWFkDQpsb2NrIGhlbGQuDQoNCkJhcnQu