Return-Path: linux-nfs-owner@vger.kernel.org Received: from dgate10.ts.fujitsu.com ([80.70.172.49]:11472 "EHLO dgate10.ts.fujitsu.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1764208Ab3DDR7g (ORCPT ); Thu, 4 Apr 2013 13:59:36 -0400 Message-Id: Date: 04 Apr 2013 19:59:35 +0200 From: Bodo Stroesser To: bfields@fieldses.org Cc: neilb@suse.de, linux-nfs@vger.kernel.org, bstroesser@ts.fujitsu.com Subject: Re: sunrpc/cache.c: races while updating cache entries Content-Type: text/plain; charset=us-ascii Sender: linux-nfs-owner@vger.kernel.org List-ID: T24gMDMgQXByIDIwMTMgMjA6MzY6MDAgKzAxMDAgSi4gQnJ1Y2UgRmllbGRzIDxiZmllbGRz QGZpZWxkc2VzLm9yZz4gd3JvdGU6Cj4gT24gVGh1LCBNYXIgMjEsIDIwMTMgYXQgMDU6NDE6 MzVQTSArMDEwMCwgQm9kbyBTdHJvZXNzZXIgd3JvdGU6Cj4gPiBPbiAyMSBNYXIgMjAxMyAw MDozNDowMCArMDEwMCBOZWlsQnJvd24gPG5laWxiQHN1c2UuZGU+IHdyb3RlOgo+ID4gPiBU aGlzIGFwcGxpZXMgb25seSB0byBTTEVTMTEtU1AxICgyLjYuMzIrKSByaWdodD8KPiA+ID4g SW4gbWFpbmxpbmUgdGhlIHJlcXVlc3Qgd29uJ3QgYmUgZHJvcHBlZCBiZWNhdXNlIHRoZSBj YWNoZSBpdGVtIGlzbid0IGFzc3VtZWQKPiA+ID4gdG8gc3RpbGwgYmUgdmFsaWQuCj4gPgo+ ID4gSSBhZ3JlZSwgdGhlcmUgd2lsbCBiZSBubyBkcm9wIGluIG1haW5saW5lLgo+ID4KPiA+ IEJ1dCBpbiBtYWlubGluZSB0aGVyZSB3aWxsIGJlIGEgdXNlbGVzcyB1cGNhbGwuIFRoYXQg dXBjYWxsIG1pZ2h0IGV2ZW4gYmUKPiA+IHByb2Nlc3NlZCBieSB0aGUgcmVhZGVyLCBpZiBj YWNoZV9jbGVhbiBpc24ndCBmYXN0ZXIgdGhlbiB0aGUgcmVhZGVyLgo+ID4gVGhlIGFuc3dl ciBmcm9tIHRoZSByZWFkZXIgd2lsbCBhZ2FpbiByZXBsYWNlIHRoZSBjdXJyZW50IGNhY2hl IGVudHJ5Cj4gPiAod2hpY2ggaXMganVzdCBhIGZldyBtaWNyb3NlY29uZHMgb2xkKSBieSBh IG5ldyBvbmUuIFRoZSBuZXcgb25lIG11c3QgYmUKPiA+IGFsbG9jYXRlZCwgdGhlIHJlcGxh Y2VkIG9uZSBtdXN0IGxhdGVyIGJlIGNsZWFuZWQuIFRoZSBzaW5nbGUgaXRlbSBjYWNoZQo+ ID4gaXMgaW52YWxpZGF0ZWQgYWdhaW4uCj4gPgo+ID4gSW4gd29yc3QgY2FzZSwgdGhlIHVu bmVjZXNzYXJ5IHJlcGxhY2VtZW50IGFsc28gY291bGQgdHJpZ2dlciB0aGUgbmV4dAo+ID4g cm91bmQgb2YgdGhlIGdhbWUgLi4uCj4gPgo+ID4gU28gaW4gbXkgb3BpbmlvbiBpdCB3b3Vs ZCBiZSBiZXR0ZXIgdG8gYWRkIHRoZSBwYXRjaCB5b3Ugc3VnZ2VzdGVkIGJlbG93Cj4gPiB0 byBtYWlubGluZSBhbHNvLgo+ID4KPiA+ID4KPiA+ID4gU28gd2UgbmVlZCB0byBtYWtlIHN1 cmUgdGhhdCBzdW5ycGNfY2FjaGVfcGlwZV91cGNhbGwgZG9lc24ndCBtYWtlIGFuIHVwY2Fs bAo+ID4gPiBvbiBhIGNhY2hlIGl0ZW0gdGhhdCBoYXMgYmVlbiByZXBsYWNlZC4gIEknZCBy YXRoZXIgbm90IHVzZSB0aGUgQ0FDSEVfQ0xFQU4KPiA+ID4gYml0ICh3aGV0aGVyIHJlbmFt ZWQgb3Igbm90KSBhcyBpdCBoYXMgYSB3ZWxsIGRlZmluZWQgbWVhbmluZyAiaGFzIGJlZW4K PiA+ID4gcmVtb3ZlZCBmcm9tIGNhY2hlIiBhbmQgSSdkIHJhdGhlciBub3QgYmx1ciB0aGF0 IG1lYW5pbmcuCj4gPiA+IFdlIGFscmVhZHkgaGF2ZSBhIHN0YXRlIHRoYXQgbWVhbnMgInRo aXMgaGFzIGJlZW4gcmVwbGFjZSItIC0+ZXhwaXJ5X3RpbWUgaXMKPiA+ID4gMC4KPiA+ID4g U28gaG93IGFib3V0IGFkZGluZwo+ID4gPiAgICBpZiAoaC0+ZXhwaXJ5X3RpbWUgPT0gMCkK PiA+ID4gICAgICAgICAgcmV0dXJuIC1FQUdBSU47Cj4gPiA+IHRvIHN1bnJwY19jYWNoZV9w aXBlX3VwY2FsbCgpIGluIFNMRVMxMS1TUDEuCj4gPiA+Cj4gPiA+IERvZXMgdGhhdCB3b3Jr IGZvciB5b3U/Cj4gPgo+ID4gWWVzLCB0aGF0IGxvb2tzIGdvb2QuIE15IHRlc3Qgd2l0aCB0 aGlzIGZpeCBpcyBydW5uaW5nIHN1Y2Nlc3NmdWxseQo+ID4gc2luY2UgNSBob3Vycy4gSSds bCBsZXQgaXQgcnVuIHVudGlsIE1vbmRheS4KPgo+IEFwb2xvZ2llcywgSSd2ZSBjb21wbGV0 ZWx5IGxvc3QgdHJhY2sgb2YgdGhpcyB0aHJlYWQ6IGRvIHdlIGtub3cgd2hhdAo+IG1haW5s aW5lIG5lZWRzIG5vdz8KPgo+IC0tYi4KPgoKVGhlcmUgaXMgbm8gcmVhc29uIGZvciBhcG9s b2dpZXMuIFRoZSB0aHJlYWQgbWVhbndoaWxlIHNlZW1zIHRvIGJlIGEgYml0CmNvbmZ1c2lu ZyA6LSkKCkN1cnJlbnQgc3RhdGUgaXM6CgotIE5laWwgQnJvd24gaGFzIGNyZWF0ZWQgdHdv IHNlcmllcyBvZiBwYXRjaGVzLiBPbmUgZm9yIFNMRVMxMS1TUDEgYW5kIGEKICBzZWNvbmQg b25lIGZvciAtU1AyCgotIEFGQUlDUywgdGhlIHNlcmllcyBmb3IgLVNQMiB3aWxsIG1hdGNo IHdpdGggbWFpbmxpbmUgYWxzby4KCi0gVG9kYXkgSSBmb3VuZCBhbmQgZml4ZWQgdGhlICho b3BlZnVsbHkpIGxhc3QgcHJvYmxlbSBpbiB0aGUgLVNQMSBzZXJpZXMuCiAgTXkgdGVzdCB1 c2luZyB0aGlzIHBhdGNoc2V0IHdpbGwgcnVuIHVudGlsIE1vbmRheS4KCi0gUHJvdmlkZWQg dGhlIHRlc3Qgb24gU1AxIHN1Y2NlZWRzLCBwcm9iYWJseSBvbiBUdWVzZGF5IEknbGwgc3Rh cnQgdG8gdGVzdAogIHRoZSBwYXRjaGVzIGZvciBTUDIgKGFuZCBtYWlubGluZSkuIElmIGl0 IHJ1bnMgZmluZSwgd2UnbGwgaGF2ZSBhIHRlc3RlZAogIHBhdGNoc2V0IG5vdCBsYXRlciB0 aGFuIE1vbiAxNXRoLgoKQm9kbwo=