From patchwork Wed Sep 29 00:56:39 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dai Ngo X-Patchwork-Id: 12524265 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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 05AF1C433EF for ; Wed, 29 Sep 2021 00:56:50 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D94AD613CD for ; Wed, 29 Sep 2021 00:56:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S243545AbhI2A62 (ORCPT ); Tue, 28 Sep 2021 20:58:28 -0400 Received: from mx0a-00069f02.pphosted.com ([205.220.165.32]:41800 "EHLO mx0a-00069f02.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S243534AbhI2A62 (ORCPT ); Tue, 28 Sep 2021 20:58:28 -0400 Received: from pps.filterd (m0246629.ppops.net [127.0.0.1]) by mx0b-00069f02.pphosted.com (8.16.1.2/8.16.1.2) with SMTP id 18T0pros027720; Wed, 29 Sep 2021 00:56:47 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=from : to : cc : subject : date : message-id : mime-version : content-transfer-encoding; s=corp-2021-07-09; bh=eZyACg3VHJcyuF9mNtb0Z1ng/pWO3eXGqlVeXrGKqmk=; b=eIn6WIh5gEcucuEuaGDWSK2eooxPTZx3e6+RJPKUyEc5eYUF8WiFswcMo52LEi3o/4p+ e9f8c9i+lP03eCVSaWezGe33m9Dh7CbjUtCHn+Of9JFkMYr+wM1YyTW0q/NrVSZ6VhK2 3JVRsEs0Ytz1y0Z09zTTE4n/W9BGWGlQPIJa5Btmd/FzG5zk7Qxzma/9XHh2bF2A/aHl fReRrZ3N8h7D4yfVSDh2qa2ncqTpM4z+tfIoG/Ywr9hW6NLZf7SzRrk7OqQ0Q2AtorWK SU/7pXA/Hs3gfDzHMJegz9gNjGLHfSDBARbWHjQvAn5Pva/taHP1XkCVW3KZXYQ+4YI2 /A== Received: from userp3030.oracle.com (userp3030.oracle.com [156.151.31.80]) by mx0b-00069f02.pphosted.com with ESMTP id 3bbj90t611-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 29 Sep 2021 00:56:47 +0000 Received: from pps.filterd (userp3030.oracle.com [127.0.0.1]) by userp3030.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 18T0uQH8052462; Wed, 29 Sep 2021 00:56:45 GMT Received: from pps.reinject (localhost [127.0.0.1]) by userp3030.oracle.com with ESMTP id 3bc3bj5mbb-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 29 Sep 2021 00:56:45 +0000 Received: from userp3030.oracle.com (userp3030.oracle.com [127.0.0.1]) by pps.reinject (8.16.0.36/8.16.0.36) with SMTP id 18T0ujKT053426; Wed, 29 Sep 2021 00:56:45 GMT Received: from userp3020.oracle.com (ksplice-shell2.us.oracle.com [10.152.118.36]) by userp3030.oracle.com with ESMTP id 3bc3bj5mau-1; Wed, 29 Sep 2021 00:56:45 +0000 From: Dai Ngo To: bfields@fieldses.org Cc: chuck.lever@oracle.com, linux-nfs@vger.kernel.org, linux-fsdevel@vger.kernel.org Subject: [PATCH RFC v5 0/2] nfsd: Initial implementation of NFSv4 Courteous Server Date: Tue, 28 Sep 2021 20:56:39 -0400 Message-Id: <20210929005641.60861-1-dai.ngo@oracle.com> X-Mailer: git-send-email 2.20.1.1226.g1595ea5.dirty MIME-Version: 1.0 X-Proofpoint-GUID: HlBOcDbteyLklao1zXXMMmrOCxb0-f8j X-Proofpoint-ORIG-GUID: HlBOcDbteyLklao1zXXMMmrOCxb0-f8j Precedence: bulk List-ID: X-Mailing-List: linux-nfs@vger.kernel.org Hi Bruce, This series of patches implement the NFSv4 Courteous Server. A server which does not immediately expunge the state on lease expiration is known as a Courteous Server. A Courteous Server continues to recognize previously generated state tokens as valid until conflict arises between the expired state and the requests from another client, or the server reboots. The v2 patch includes the following: . add new callback, lm_expire_lock, to lock_manager_operations to allow the lock manager to take appropriate action with conflict lock. . handle conflicts of NFSv4 locks with NFSv3/NLM and local locks. . expire courtesy client after 24hr if client has not reconnected. . do not allow expired client to become courtesy client if there are waiters for client's locks. . modify client_info_show to show courtesy client and seconds from last renew. . fix a problem with NFSv4.1 server where the it keeps returning SEQ4_STATUS_CB_PATH_DOWN in the successful SEQUENCE reply, after the courtesy client re-connects, causing the client to keep sending BCTS requests to server. The v3 patch includes the following: . modified posix_test_lock to check and resolve conflict locks to handle NLM TEST and NFSv4 LOCKT requests. . separate out fix for back channel stuck in SEQ4_STATUS_CB_PATH_DOWN. The v4 patch includes: . rework nfsd_check_courtesy to avoid dead lock of fl_lock and client_lock by asking the laudromat thread to destroy the courtesy client. . handle NFSv4 share reservation conflicts with courtesy client. This includes conflicts between access mode and deny mode and vice versa. . drop the patch for back channel stuck in SEQ4_STATUS_CB_PATH_DOWN. The v5 patch includes: . fix recursive locking of file_rwsem from posix_lock_file. . retest with LOCKDEP enabled. NOTE: I will submit pynfs tests for courteous server including tests for share reservation conflicts in a separate patch.