Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753067AbdFLXAu (ORCPT ); Mon, 12 Jun 2017 19:00:50 -0400 Received: from mail-pg0-f49.google.com ([74.125.83.49]:35154 "EHLO mail-pg0-f49.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752871AbdFLXAr (ORCPT ); Mon, 12 Jun 2017 19:00:47 -0400 MIME-Version: 1.0 In-Reply-To: References: <20170603011241.GH6365@ZenIV.linux.org.uk> <20170603062009.GI6365@ZenIV.linux.org.uk> From: Khazhismel Kumykov Date: Mon, 12 Jun 2017 16:00:45 -0700 Message-ID: Subject: Re: Hang/soft lockup in d_invalidate with simultaneous calls To: Al Viro Cc: linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, Miklos Szeredi Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-256; boundary="f403045ebf5c17d0d60551cb4a4c" Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 7579 Lines: 108 --f403045ebf5c17d0d60551cb4a4c Content-Type: text/plain; charset="UTF-8" On Fri, Jun 2, 2017 at 11:47 PM, Khazhismel Kumykov wrote: > On Fri, Jun 2, 2017 at 11:20 PM, Al Viro wrote: >> The thing is, unlike shrink_dcache_parent() we *can* bugger off as >> soon as we'd found no victims, nothing mounted and dentry itself >> is unhashed. We can't do anything in select_collect() (we would've >> broken shrink_dcache_parent() that way), but we can do unhashing >> in check_and_drop() in "really nothing to do" case and we can return >> from d_invalidate() after that. So how about this: > That does the trick. I'm not entirely familiar the process here, is the above change committed somewhere, should I propose a patch? --f403045ebf5c17d0d60551cb4a4c Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" Content-Description: S/MIME Cryptographic Signature MIIS5wYJKoZIhvcNAQcCoIIS2DCCEtQCAQExDzANBglghkgBZQMEAgEFADALBgkqhkiG9w0BBwGg ghBNMIIEXDCCA0SgAwIBAgIOSBtqDm4P/739RPqw/wcwDQYJKoZIhvcNAQELBQAwZDELMAkGA1UE BhMCQkUxGTAXBgNVBAoTEEdsb2JhbFNpZ24gbnYtc2ExOjA4BgNVBAMTMUdsb2JhbFNpZ24gUGVy c29uYWxTaWduIFBhcnRuZXJzIENBIC0gU0hBMjU2IC0gRzIwHhcNMTYwNjE1MDAwMDAwWhcNMjEw NjE1MDAwMDAwWjBMMQswCQYDVQQGEwJCRTEZMBcGA1UEChMQR2xvYmFsU2lnbiBudi1zYTEiMCAG A1UEAxMZR2xvYmFsU2lnbiBIViBTL01JTUUgQ0EgMTCCASIwDQYJKoZIhvcNAQEBBQADggEPADCC AQoCggEBALR23lKtjlZW/17kthzYcMHHKFgywfc4vLIjfq42NmMWbXkNUabIgS8KX4PnIFsTlD6F GO2fqnsTygvYPFBSMX4OCFtJXoikP2CQlEvO7WooyE94tqmqD+w0YtyP2IB5j4KvOIeNv1Gbnnes 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