From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id AFF74ECAAD5 for ; Fri, 26 Aug 2022 23:39:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231629AbiHZXja (ORCPT ); Fri, 26 Aug 2022 19:39:30 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43216 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229704AbiHZXj3 (ORCPT ); Fri, 26 Aug 2022 19:39:29 -0400 Received: from smtp-out1.suse.de (smtp-out1.suse.de [IPv6:2001:67c:2178:6::1c]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id DB4EEE3C25 for ; Fri, 26 Aug 2022 16:39:28 -0700 (PDT) Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by smtp-out1.suse.de (Postfix) with ESMTPS id 87AEA33719; 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Fri, 26 Aug 2022 23:39:25 +0000 (UTC) Received: from dovecot-director2.suse.de ([192.168.254.65]) by imap2.suse-dmz.suse.de with ESMTPSA id 0TyqNK1ZCWOXeQAAMHmgww (envelope-from ); Fri, 26 Aug 2022 23:39:25 +0000 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 MIME-Version: 1.0 From: "NeilBrown" To: "Trond Myklebust" Cc: "bcodding@redhat.com" , "anna@kernel.org" , "linux-nfs@vger.kernel.org" Subject: Re: [PATCH 0/2] NFS: limit use of ACCESS cache for negative responses In-reply-to: References: <165110909570.7595.8578730126480600782.stgit@noble.brown>, <165274590805.17247.12823419181284113076@noble.neil.brown.name>, <72f091ceaaf15069834eb200c04f0630eca7eaef.camel@hammerspace.com>, <165274805538.17247.18045261877097040122@noble.neil.brown.name>, , <165274950799.17247.7605561502483278140@noble.neil.brown.name>, <3ec50603479c7ee60cfa269aa06ae151e3ebc447.camel@hammerspace.com>, <165275056203.17247.1826100963816464474@noble.neil.brown.name>, , , Date: Sat, 27 Aug 2022 09:39:21 +1000 Message-id: <166155716162.27490.17801636432417958045@noble.neil.brown.name> Precedence: bulk List-ID: X-Mailing-List: linux-nfs@vger.kernel.org T24gU2F0LCAyNyBBdWcgMjAyMiwgVHJvbmQgTXlrbGVidXN0IHdyb3RlOgo+IE9uIEZyaSwgMjAy Mi0wOC0yNiBhdCAxMDo1OSAtMDQwMCwgQmVuamFtaW4gQ29kZGluZ3RvbiB3cm90ZToKPiA+IE9u IDE2IE1heSAyMDIyLCBhdCAyMTozNiwgVHJvbmQgTXlrbGVidXN0IHdyb3RlOgo+ID4gPiBTbyB1 bnRpbCB5b3UgaGF2ZSBhIGRpZmZlcmVudCBzb2x1dGlvbiB0aGF0IGRvZXNuJ3QgaW1wYWN0IHRo ZQo+ID4gPiBjbGllbnQncwo+ID4gPiBhYmlsaXR5IHRvIGNhY2hlIHBlcm1pc3Npb25zLCB0aGVu IHRoZSBhbnN3ZXIgaXMgZ29pbmcgdG8gYmUgIm5vIgo+ID4gPiB0bwo+ID4gPiB0aGVzZSBwYXRj aGVzLgo+ID4gCj4gPiBIaSBUcm9uZCwKPiA+IAo+ID4gV2UgaGF2ZSBzb21lIGZvbGtzIG5lZ2F0 aXZlbHkgaW1wYWN0ZWQgYnkgdGhpcyBpc3N1ZSBhcyB3ZWxsLsKgIEFyZQo+ID4geW91Cj4gPiB3 aWxsaW5nIHRvIGNvbnNpZGVyIHRoaXMgdmlhIGEgbW91bnQgb3B0aW9uPwo+ID4gCj4gPiBCZW4K PiA+IAo+IAo+IEkgZG9uJ3Qgc2VlIGhvdyB0aGF0IGFuc3dlcnMgbXkgY29uY2Vybi4KCkNvdWxk IHlvdSBwbGVhc2Ugc3BlbGwgb3V0IGFnYWluIHdoYXQgeW91ciBjb25jZXJucyBhcmU/ICBJIHN0 aWxsIGRvbid0CnVuZGVyc3RhbmQuIApUaGUgb25seSBwZXJmb3JtYW5jZSBpbXBhY3QgaXMgd2hl biBhIHBlcm1pc3Npb24gdGVzdCBmYWlscy4gIEluIHdoYXQKY2lyY3Vtc3RhbmNlIGlzIHBlcm1p c3Npb24gZmFpbHVyZSBleHBlY3RlZCBvbiBhIGZhc3QtcGF0aD8KCj4gCj4gSSdkIHJhdGhlciBz ZWUgdXMgc2V0IHVwIGFuIGV4cGxpY2l0IHRyaWdnZXIgbWVjaGFuaXNtLiBJdCBkb2Vzbid0IGhh dmUKPiB0byBiZSBwYXJ0aWN1bGFybHkgc29waGlzdGljYXRlZC4gSSBjYW4gaW1hZ2luZSBqdXN0 IGhhdmluZyBhIGdsb2JhbCwKPiBvciBtb3JlIGxpa2VseSBhIHBlci1jb250YWluZXIsIGNvb2tp ZSB0aGF0IGhhcyBhIGNvbnRyb2wgbWVjaGFuaXNtIGluCj4gL3N5cy9mcy9uZnMsIGFuZCB0aGF0 IGNhbiBiZSB1c2VkIHRvIG9yZGVyIGFsbCB0aGUgaW5vZGVzIHRvIGludmFsaWRhdGUKPiB0aGVp ciBwZXJtaXNzaW9ucyBjYWNoZXMgd2hlbiB5b3UgYmVsaWV2ZSB0aGVyZSBpcyBhIG5lZWQgdG8g ZG8gc28uCgpJIGhvcGUgaXQgd291bGQgb25seSBpbnZhbGlkYXRlIG5lZ2F0aXZlIGNhY2hlZCBw ZXJtaXNzaW9ucywgbm90CnBvc2l0aXZlLgpDYWNoZXMgcG9zaXRpdmUgcGVybWlzc2lvbnMgYXJl bid0IHJlYWxseSBhIHByb2JsZW0gYXMgd2UnbGwgZmluZCBvdXQKdGhleSB3ZXJlIHdyb25nIGFz IHNvb24gYXMgd2Ugc2VuZCB0aGUgcmVsZXZhbnQgcmVxdWVzdCB0byB0aGUgc2VydmVyLgpUaGUg cHJvYmxlbSB3aXRoIGNhY2hlZCBuZWdhdGl2ZSBwZXJtaXNzaW9ucyBpcyB0aGF0IHdlIG5ldmVy IGV2ZW4gdHJ5CnRvIHNlbmQgYSByZXF1ZXN0IHRvIHRoZSBzZXJ2ZXIuCgpUaGUgY2xpZW50IGRv ZXNuJ3QgKmtub3cqIHdoZW4gdGhlIHNlcnZlciBjaGFuZ2VzIGl0J3MgdW5kZXJzdGFuZGluZyBv Zgpncm91cCBtZW1iZXJzaGlwLCBzbyBpdCBjYW5ub3Qga25vdyB3aGVuIHRvIHdyaXRlIHRvIHRo aXMuICBTbyB0aGUgYmVzdAp0aGUgY2xpZW50IGNhbiBkbyBpcyBpbnZhbGlkYXRlIG5lZ2F0aXZl IGNhY2hlZCBwZXJtaXNzaW9ucwpwZXJpb2RpY2FsbHkuICBTbyBpZiB0aGlzIC9zeXMvZnMvbmZz LyB0dW5hYmxlIHdlcmUgdG8gYmUgYWRkZWQsIEkgd291bGQKbGlrZSBpdCB0byBiZSBhIHRpbWUg aW50ZXJ2YWwgYWZ0ZXIgd2hpY2ggdGhleSBjYW4gZXhwaXJlIChJIHdvdWxkIHNldCBpdAp0byB6 ZXJvIG9mIGNvdXJzZSkuCgpUaGFua3MsCk5laWxCcm93bgoKPiAKPiBpLmUuIHlvdSBjYWNoZSB0 aGUgdmFsdWUgb2YgdGhlIGdsb2JhbCBjb29raWUgaW4gdGhlIGlub2RlLCBhbmQgaWYgeW91Cj4g bm90aWNlIGEgY2hhbmdlLCB0aGVuIHRoYXQncyB0aGUgc2lnbmFsIHRoYXQgeW91IG5lZWQgdG8g aW52YWxpZGF0ZSB0aGUKPiBwZXJtaXNzaW9ucyBjYWNoZSBiZWZvcmUgdXBkYXRpbmcgdGhlIGNh Y2hlZCB2YWx1ZSBvZiB0aGUgY29va2llLgo+IAo+IFRoYXQgd2F5LCB5b3UgaGF2ZSBhIG1lY2hh bmlzbSB0aGF0IHNlcnZlcyBhbGwgcHVycG9zZXM6IGl0IGNhbiBkbyBhbgo+IGltbWVkaWF0ZSBv bmUtdGltZSBvbmx5IGZsdXNoLCBvciB5b3UgY2FuIHNldCB1cCBhIHVzZXJzcGFjZSBqb2IgdGhh dAo+IGlzc3VlcyBhIGdsb2JhbCBmbHVzaCBvbmNlIGV2ZXJ5IHNvIG9mdGVuLCBlLmcuIHVzaW5n IGEgY3JvbiBqb2IuCj4gCj4gLS0gCj4gVHJvbmQgTXlrbGVidXN0Cj4gTGludXggTkZTIGNsaWVu dCBtYWludGFpbmVyLCBIYW1tZXJzcGFjZQo+IHRyb25kLm15a2xlYnVzdEBoYW1tZXJzcGFjZS5j b20KPiAKPiAKPiAK