From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-eopbgr710105.outbound.protection.outlook.com ([40.107.71.105]:35529 "EHLO NAM05-BY2-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1726720AbeILBBo (ORCPT ); Tue, 11 Sep 2018 21:01:44 -0400 From: Trond Myklebust To: "cks@cs.toronto.edu" CC: "linux-nfs@vger.kernel.org" Subject: Re: A NFS client partial file corruption problem in recent/current kernels Date: Tue, 11 Sep 2018 20:00:48 +0000 Message-ID: <78ca0a56d72cda910b38a37cadd4780e112c7906.camel@hammerspace.com> References: <20180911180218.9A66C322562@apps1.cs.toronto.edu> In-Reply-To: <20180911180218.9A66C322562@apps1.cs.toronto.edu> Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Sender: linux-nfs-owner@vger.kernel.org List-ID: T24gVHVlLCAyMDE4LTA5LTExIGF0IDE0OjAyIC0wNDAwLCBDaHJpcyBTaWViZW5tYW5uIHdyb3Rl Og0KPiA+ID4gIFdlJ3ZlIGZvdW5kIGEgcmVhZGlseSByZXByb2R1Y2FibGUgc2l0dWF0aW9uIHdo ZXJlIHRoZSBjdXJyZW50DQo+ID4gPiBORlMgY2xpZW50IGNvZGUgd2lsbCBwcm92aWRlIHplcm8g Ynl0ZXMgaW5zdGVhZCBvZiBhY3R1YWwgZGF0YSBhdA0KPiA+ID4gdGhlIGVuZCBvZiB0aGUgZmls ZSAoc29ydCBvZikgdG8gdXNlciBwcm9ncmFtcy4gVGhpcyBjYW4gcmVzdWx0DQo+ID4gPiBpbiBw cm9ncmFtIGZhaWx1cmUsIG9yIHBlcm1hbmVudCBmaWxlIGNvcnJ1cHRpb24gaWYgdGhlIHByb2dy YW0NCj4gPiA+IHJlYWRpbmcgdGhlIGZpbGUgd3JpdGVzIHRoZSBiYWQgZGF0YSBiYWNrIHRvIHRo ZSBmaWxlOyBvdGhlcndpc2UsDQo+ID4gPiB0aGUgY29ycnVwdGlvbiBnb2VzIGF3YXkgd2hlbiB0 aGUgY2xpZW50J3MgY2FjaGVkIGRhdGEgaXMgcHVzaGVkDQo+ID4gPiBvdXQNCj4gPiA+IG9mIG1l bW9yeSAob3IgZXhwbGljaXRseSBkcm9wcGVkIGJ5IGRyb3BwaW5nIHRoZSBwYWdlY2FjaGUNCj4g PiA+IHRocm91Z2gNCj4gPiA+IC9wcm9jL3N5cy92bS9kcm9wX2NhY2hlcykuDQo+IA0KPiBbLi4u XQ0KPiA+IFBsZWFzZSBzZWUgaHR0cDovL25mcy5zb3VyY2Vmb3JnZS5uZXQvI2ZhcV9hOA0KPiAN Cj4gIEkgZG9uJ3QgdGhpbmsgdGhpcyBpcyBhIGNsb3NlIHRvIG9wZW4gY29uc2lzdGVuY3kgaXNz dWUsIG9yIGlmIGl0IGlzDQo+IEkgd291bGQgYXJndWUgdGhhdCBpdCBpcyBhIGNsZWFyIGJ1ZyBv biB0aGUgTGludXggTkZTIGNsaWVudC4gSSBoYXZlDQo+IGEgbnVtYmVyIG9mIHJlYXNvbnMgZm9y IHNheWluZyB0aGlzOg0KPiANCj4gLSB0aGUgY2xpZW50IGNsZWFybHkgc2VlcyB0aGUgbmV3IGF0 dHJpYnV0ZXM7IGl0IGtub3dzIHRoYXQgdGhlIGZpbGUNCj4gICBoYXMgYmVlbiBleHRlbmRlZCBm cm9tIHRoZSBwcmV2aW91cyBzdGF0ZSB0aGF0IGl0IGtuZXcgb2YuIE15IGRlbW8NCj4gICBwcm9n cmFtIHNwZWNpZmljYWxseSB3YWl0cyB1bnRpbCB1c2VyLWxldmVsIGZzdGF0KCkgcmV0dXJucyBh DQo+IGRpZmZlcmVudA0KPiAgIHJlc3VsdCwgd2hpY2ggSSBiZWxpZXZlIG1lYW5zIHRoYXQgdGhl IGNsaWVudCBrZXJuZWwgaGFzIHNlZW4gYQ0KPiBkaWZmZXJlbnQNCj4gICBHRVRBVFRSIHJlc3Vs dCBhbmQgc28gc2hvdWxkIGhhdmUgcHVyZ2VkIGl0cyBjYWNoZSAoYmFzZWQgb24gd2hhdA0KPiB0 aGUNCj4gICBGQVEgc2F5cykuDQo+IA0KPiAgIChVbmxlc3MgdGhlIEZBUSBtZWFucyB0aGF0IHRo ZSBrZXJuZWwgYWJzb2x1dGVseSByZWZ1c2VzIHRvDQo+IGd1YXJhbnRlZQ0KPiAgIGFueXRoaW5n IGFib3V0IGZpbGUgY29uc2lzdGVuY3kgdW5sZXNzIHlvdSBjbG9zZSBhbmQgdGhlbiByZW9wZW4N Cj4gdGhlDQo+ICAgZmlsZSwgZXZlbiBpZiBpdCAqa25vd3MqIHRoYXQgdGhlIGZpbGUgaGFzIGNo YW5nZWQgb24gdGhlIHNlcnZlciwNCj4gICB3aGljaCBpc24ndCBjbGVhciBmcm9tIGhvdyB0aGUg RkFRIGlzIGN1cnJlbnRseSB3cml0dGVuLikNCj4gDQo+IC0gdGhlIGNsaWVudCBpcyBmZXRjaGlu ZyBzb21lIG5ldyBkYXRhIGZyb20gdGhlIGZpbGVzZXJ2ZXIgKGRhdGENCj4gYWZ0ZXINCj4gICB0 aGUgcGFydGlhbCA0IEtCIHBhZ2UgYXQgdGhlIG9sZCBlbmQgb2YgdGhlIGZpbGUpLg0KPiANCj4g LSB0aGUgY2xpZW50IGlzbid0IHdyaXRpbmcgdG8gdGhlIGZpbGUgaW4gbXkgZGVtb25zdHJhdGlv biBwcm9ncmFtOw0KPiBpdCdzDQo+ICAgb25seSBvcGVuaW5nIGl0IGluIHJlYWQtd3JpdGUgbW9k ZSBhbmQgdGhlbiByZWFkaW5nIGl0LiBBbHNvLCB0aGlzDQo+ICAgZG9lc24ndCBoYXBwZW4gaWYg dGhlIGNsaWVudCBkb2VzIGV4YWN0bHkgdGhlIHNhbWUgc2V0IG9mDQo+IG9wZXJhdGlvbnMNCj4g ICBidXQgaGFzIHRoZSBmaWxlIG9wZW4gcmVhZC1vbmx5ICh3aXRoIGl0IHN0YXlpbmcgb3BlbiB0 aHJvdWdob3V0KS4NCj4gDQo+IC0gdGhpcyBkaWRuJ3QgaGFwcGVuIGluIG9sZGVyIGtlcm5lbHMu DQo+IA0KPiBJbiBhZGRpdGlvbiwgYWx0aG91Z2ggSSBkaWRuJ3QgbWVudGlvbiBpdCBpbiBteSBv cmlnaW5hbCBlbWFpbCwgdGhpcw0KPiBoYXBwZW5zIG9uIGEgTkZTIGZpbGVzeXN0ZW0gbW91bnRl ZCAnbm9hYycuDQo+IA0KPiBQcmFnbWF0aWNhbGx5LCBBbHBpbmUgdXNlZCB0byB3b3JrIHdpdGgg TkZTIG1vdW50ZWQgZmlsZXN5c3RlbXMgd2hlcmUNCj4gZW1haWwgd2FzIGFwcGVuZGVkIHRvIHRo ZW0gZnJvbSBvdGhlciBtYWNoaW5lcyBhbmQgaXQgbm8gbG9uZ2VyIGRvZXMsDQo+IGFuZCB0aGUg b25seSBkaWZmZXJlbmNlIGlzIHRoZSBrZXJuZWwgdmVyc2lvbiBpbnZvbHZlZCBvbiB0aGUgY2xp ZW50Lg0KPiBUaGlzIGJyZWFrYWdlIGlzIGFjdGl2ZWx5IGRhbmdlcm91cy4NCg0KU3VyZSwgYnV0 IHVubGVzcyB5b3UgYXJlIGxvY2tpbmcgdGhlIGZpbGUsIG9yIHlvdSBhcmUgZXhwbGljaXRseSB1 c2luZw0KT19ESVJFQ1QgdG8gZG8gdW5jYWNoZWQgSS9PLCB0aGVuIHlvdSBhcmUgaW4gdmlvbGF0 aW9uIG9mIHRoZSBjbG9zZS10by0NCm9wZW4gY29uc2lzdGVuY3kgbW9kZWwsIGFuZCB0aGUgY2xp ZW50IGlzIGdvaW5nIHRvIGJlaGF2ZSBhcyB5b3UNCmRlc2NyaWJlIGFib3ZlLiBORlMgdXNlcyBh IGRpc3RyaWJ1dGVkIGZpbGVzeXN0ZW0gbW9kZWwsIG5vdCBhDQpjbHVzdGVyZWQgb25lLg0KDQot LSANClRyb25kIE15a2xlYnVzdA0KTGludXggTkZTIGNsaWVudCBtYWludGFpbmVyLCBIYW1tZXJz cGFjZQ0KdHJvbmQubXlrbGVidXN0QGhhbW1lcnNwYWNlLmNvbQ0KDQoNCg==