From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: linux-nfs-owner@vger.kernel.org Received: from mx2.netapp.com ([216.240.18.37]:53138 "EHLO mx2.netapp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751742Ab2GHOeX (ORCPT ); Sun, 8 Jul 2012 10:34:23 -0400 From: "Myklebust, Trond" To: Julia Lawall CC: "linux-nfs@vger.kernel.org" Subject: Re: question about fs/nfs/direct.c Date: Sun, 8 Jul 2012 14:34:03 +0000 Message-ID: <1341758042.3575.6.camel@lade.trondhjem.org> References: In-Reply-To: Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Sender: linux-nfs-owner@vger.kernel.org List-ID: T24gU3VuLCAyMDEyLTA3LTA4IGF0IDExOjE1ICswMjAwLCBKdWxpYSBMYXdhbGwgd3JvdGU6DQo+ IFRoZSBmb2xsb3dpbmcgY29kZSwgaW4gdGhlIGZ1bmN0aW9uIG5mc19kaXJlY3Rfd3JpdGVfcmVz Y2hlZHVsZSwgbG9va3MgDQo+IHN0cmFuZ2UgdG8gbWU6DQo+IA0KPiAgICAgICAgICBsaXN0X2Zv cl9lYWNoX2VudHJ5X3NhZmUocmVxLCB0bXAsICZyZXFzLCB3Yl9saXN0KSB7DQo+ICAgICAgICAg ICAgICAgICAgaWYgKCFuZnNfcGFnZWlvX2FkZF9yZXF1ZXN0KCZkZXNjLCByZXEpKSB7DQo+ICAg ICAgICAgICAgICAgICAgICAgICAgICBuZnNfbGlzdF9hZGRfcmVxdWVzdChyZXEsICZmYWlsZWQp Ow0KPiAgICAgICAgICAgICAgICAgICAgICAgICAgc3Bpbl9sb2NrKGNpbmZvLmxvY2spOw0KPiAg ICAgICAgICAgICAgICAgICAgICAgICAgZHJlcS0+ZmxhZ3MgPSAwOw0KPiAgICAgICAgICAgICAg ICAgICAgICAgICAgZHJlcS0+ZXJyb3IgPSAtRUlPOw0KPiAgICAgICAgICAgICAgICAgICAgICAg ICAgc3Bpbl91bmxvY2soY2luZm8ubG9jayk7DQo+ICAgICAgICAgICAgICAgICAgfQ0KPiAgICAg ICAgICAgICAgICAgIG5mc19yZWxlYXNlX3JlcXVlc3QocmVxKTsNCj4gICAgICAgICAgfQ0KPiAg ICAgICAgICBuZnNfcGFnZWlvX2NvbXBsZXRlKCZkZXNjKTsNCj4gDQo+ICAgICAgICAgIHdoaWxl ICghbGlzdF9lbXB0eSgmZmFpbGVkKSkNCj4gICAgICAgICAgICAgICAgICBuZnNfdW5sb2NrX2Fu ZF9yZWxlYXNlX3JlcXVlc3QocmVxKTsNCj4gDQo+IEFmdGVyIHRoZSBsaXN0X2Zvcl9lYWNoX2Vu dHJ5X3NhZmUsIHJlcSBpcyBhbiBhZGRyZXNzIGF0IHNvbWUgb2Zmc2V0IGZyb20gDQo+IHRoZSBs aXN0IGhlYWQuICBTbyBpdCBkb2VzIG5vdCBzZWVtIGxpa2UgYW4gYXBwcm9wcmlhdGUgYXJndW1l bnQgdG8gDQo+IG5mc191bmxvY2tfYW5kX3JlbGVhc2VfcmVxdWVzdC4NCg0KRG9oIS4uLiBUaGF0 J3MgYSBidWcgdGhhdCBjcmVwdCBpbiB2aWEgY29tbWl0DQoxNzYzZGExMjM0Y2JhNjYzYjg0OTQ3 NmQ0NTFiZGNjYWM1MTQ3ODU5IChORlM6IHJld3JpdGUgZGlyZWN0aW8gd3JpdGUgdG8NCnVzZSBh c3luYyBjb2FsZXNjZSBjb2RlKSBhbmQgaGFzIGJlZW4gInBvbGlzaGVkIiB1bnRpbCBpdCBnbGVh bnMgc2V2ZXJhbA0KdGltZXMgd2l0aCBhc3NvcnRlZCBjbGVhbnVwcy4uLg0KDQpIb3cgYWJvdXQg c29tZXRoaW5nIGxpa2UgdGhlIGZvbGxvd2luZyBmaXg/DQo4PC0tLS0tLS0tLS0tLS0tLS0tLS0t LS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLQ0KRnJvbSA0 MDM1YzI0ODdmMTc5MzI3ZmFlODdhZjM0Nzc2NTk0MDJiNzk3NTg0IE1vbiBTZXAgMTcgMDA6MDA6 MDAgMjAwMQ0KRnJvbTogVHJvbmQgTXlrbGVidXN0IDxUcm9uZC5NeWtsZWJ1c3RAbmV0YXBwLmNv bT4NCkRhdGU6IFN1biwgOCBKdWwgMjAxMiAxMDoyNDoxMCAtMDQwMA0KU3ViamVjdDogW1BBVENI XSBORlM6IEZpeCBsaXN0IG1hbmlwdWxhdGlvbiBzbmFmdXMgaW4gZnMvbmZzL2RpcmVjdC5jDQoN CkZpeCAyIGJ1Z3MgaW4gbmZzX2RpcmVjdF93cml0ZV9yZXNjaGVkdWxlOg0KDQogLSBUaGUgcmVx dWVzdCBuZWVkcyB0byBiZSByZW1vdmVkIGZyb20gdGhlICdyZXFzJyBsaXN0IGJlZm9yZSBpdCBj YW4NCiAgIGJlIGFkZGVkIHRvICdmYWlsZWQnLg0KIC0gRml4IGFuIGluZmluaXRlIGxvb3AgaWYg dGhlICdmYWlsZWQnIGxpc3QgaXMgbm9uLWVtcHR5Lg0KDQpSZXBvcnRlZC1ieTogSnVsaWEgTGF3 YWxsIDxqdWxpYS5sYXdhbGxAbGlwNi5mcj4NClNpZ25lZC1vZmYtYnk6IFRyb25kIE15a2xlYnVz dCA8VHJvbmQuTXlrbGVidXN0QG5ldGFwcC5jb20+DQotLS0NCiBmcy9uZnMvZGlyZWN0LmMgfCAg ICA2ICsrKysrLQ0KIDEgZmlsZSBjaGFuZ2VkLCA1IGluc2VydGlvbnMoKyksIDEgZGVsZXRpb24o LSkNCg0KZGlmZiAtLWdpdCBhL2ZzL25mcy9kaXJlY3QuYyBiL2ZzL25mcy9kaXJlY3QuYw0KaW5k ZXggOWE0Y2JmYy4uNDgyNTMzNyAxMDA2NDQNCi0tLSBhL2ZzL25mcy9kaXJlY3QuYw0KKysrIGIv ZnMvbmZzL2RpcmVjdC5jDQpAQCAtNDg0LDYgKzQ4NCw3IEBAIHN0YXRpYyB2b2lkIG5mc19kaXJl Y3Rfd3JpdGVfcmVzY2hlZHVsZShzdHJ1Y3QgbmZzX2RpcmVjdF9yZXEgKmRyZXEpDQogDQogCWxp c3RfZm9yX2VhY2hfZW50cnlfc2FmZShyZXEsIHRtcCwgJnJlcXMsIHdiX2xpc3QpIHsNCiAJCWlm ICghbmZzX3BhZ2Vpb19hZGRfcmVxdWVzdCgmZGVzYywgcmVxKSkgew0KKwkJCW5mc19saXN0X3Jl bW92ZV9yZXF1ZXN0KHJlcSk7DQogCQkJbmZzX2xpc3RfYWRkX3JlcXVlc3QocmVxLCAmZmFpbGVk KTsNCiAJCQlzcGluX2xvY2soY2luZm8ubG9jayk7DQogCQkJZHJlcS0+ZmxhZ3MgPSAwOw0KQEAg LTQ5NCw4ICs0OTUsMTEgQEAgc3RhdGljIHZvaWQgbmZzX2RpcmVjdF93cml0ZV9yZXNjaGVkdWxl KHN0cnVjdCBuZnNfZGlyZWN0X3JlcSAqZHJlcSkNCiAJfQ0KIAluZnNfcGFnZWlvX2NvbXBsZXRl KCZkZXNjKTsNCiANCi0Jd2hpbGUgKCFsaXN0X2VtcHR5KCZmYWlsZWQpKQ0KKwl3aGlsZSAoIWxp c3RfZW1wdHkoJmZhaWxlZCkpIHsNCisJCXJlcSA9IG5mc19saXN0X2VudHJ5KGZhaWxlZC5uZXh0 KTsNCisJCW5mc19saXN0X3JlbW92ZV9yZXF1ZXN0KHJlcSk7DQogCQluZnNfdW5sb2NrX2FuZF9y ZWxlYXNlX3JlcXVlc3QocmVxKTsNCisJfQ0KIA0KIAlpZiAocHV0X2RyZXEoZHJlcSkpDQogCQlu ZnNfZGlyZWN0X3dyaXRlX2NvbXBsZXRlKGRyZXEsIGRyZXEtPmlub2RlKTsNCi0tIA0KMS43LjEw LjQNCg0KDQotLSANClRyb25kIE15a2xlYnVzdA0KTGludXggTkZTIGNsaWVudCBtYWludGFpbmVy DQoNCk5ldEFwcA0KVHJvbmQuTXlrbGVidXN0QG5ldGFwcC5jb20NCnd3dy5uZXRhcHAuY29tDQoN Cg==