From patchwork Sat Dec 11 01:02:42 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dai Ngo X-Patchwork-Id: 12671403 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 DB1B4C433F5 for ; Sat, 11 Dec 2021 01:03:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1345515AbhLKBGg (ORCPT ); Fri, 10 Dec 2021 20:06:36 -0500 Received: from mx0b-00069f02.pphosted.com ([205.220.177.32]:27734 "EHLO mx0b-00069f02.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234568AbhLKBGf (ORCPT ); Fri, 10 Dec 2021 20:06:35 -0500 Received: from pps.filterd (m0246630.ppops.net [127.0.0.1]) by mx0b-00069f02.pphosted.com (8.16.1.2/8.16.1.2) with SMTP id 1BANhkRV021853; Sat, 11 Dec 2021 01:02:57 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=8fAWasTCPnJSxekMKOm74e92kXZQz3YEz4utQmiVLOQ=; b=eS6tlH2pGYyyPDI1tO4HReQK/USxy0+Qr6LMN+QSIKUW7kcDa8bY5qEPyDJ70dlFeINh J/KyfoXW6dBUeW/dITmgAlGuB24lVRfBvRZvdJxmUnJs0XlhnWvGpYgE8wlhy2ciDyrm SPl+zrx9eRTyAyEQHgzJZVo1io3faoa4htYoLJJ6i2Ijplwjb0c0YyLAITZeftp2AYAS kRJeizI32Yro9RM/psR5e5C6dFcDRGoGqBulgid9CQqa9aN9pEL8cx0XeNDxw2MksKYG +CG70X/omLblzIwfH1XXXMS12Rt1WhvBrOU6H4NfjMivF4xTRlW5nvNztAgNiOYMBWPN ig== Received: from userp3030.oracle.com (userp3030.oracle.com [156.151.31.80]) by mx0b-00069f02.pphosted.com with ESMTP id 3cve1v8atu-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Sat, 11 Dec 2021 01:02:57 +0000 Received: from pps.filterd (userp3030.oracle.com [127.0.0.1]) by userp3030.oracle.com (8.16.1.2/8.16.1.2) with SMTP id 1BB11Lif152886; Sat, 11 Dec 2021 01:02:56 GMT Received: from pps.reinject (localhost [127.0.0.1]) by userp3030.oracle.com with ESMTP id 3cvh3saduy-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Sat, 11 Dec 2021 01:02:56 +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 1BB12tDV159105; Sat, 11 Dec 2021 01:02:55 GMT Received: from userp3020.oracle.com (ksplice-shell2.us.oracle.com [10.152.118.36]) by userp3030.oracle.com with ESMTP id 3cvh3sadtr-1; Sat, 11 Dec 2021 01:02:55 +0000 From: Dai Ngo To: bfields@fieldses.org Cc: chuck.lever@oracle.com, jlayton@redhat.com, viro@zeniv.linux.org.uk, linux-nfs@vger.kernel.org, linux-fsdevel@vger.kernel.org Subject: [PATCH RFC v7 0/2] nfsd: Initial implementation of NFSv4 Courteous Server Date: Fri, 10 Dec 2021 20:02:42 -0500 Message-Id: <20211211010244.44599-1-dai.ngo@oracle.com> X-Mailer: git-send-email 2.20.1.1226.g1595ea5.dirty MIME-Version: 1.0 X-Proofpoint-ORIG-GUID: w7bzi_OxjEswzBt5OeG22tUiea1aS2aD X-Proofpoint-GUID: w7bzi_OxjEswzBt5OeG22tUiea1aS2aD Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@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. The v6 patch includes: . merge witn 5.15-rc7 . fix a bug in nfs4_check_deny_bmap that did not check for matched nfs4_file before checking for access/deny conflict. This bug causes pynfs OPEN18 to fail since the server taking too long to release lots of un-conflict clients' state. . enhance share reservation conflict handler to handle case where a large number of conflict courtesy clients need to be expired. The 1st 100 clients are expired synchronously and the rest are expired in the background by the laundromat and NFS4ERR_DELAY is returned to the NFS client. This is needed to prevent the NFS client from timing out waiting got the reply. The v7 patch includes: . Fix race condition in posix_test_lock and posix_lock_inode after dropping spinlock. . Enhance nfsd4_fl_expire_lock to work with with new lm_expire_lock callback . Always resolve share reservation conflicts asynchrously. . Fix bug in nfs4_laundromat where spinlock is not used when scanning cl_ownerstr_hashtbl. . Fix bug in nfs4_laundromat where idr_get_next was called with incorrect 'id'. . Merge nfs4_destroy_courtesy_client into nfsd4_fl_expire_lock.