From patchwork Sat Mar 5 00:37:08 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dai Ngo X-Patchwork-Id: 12770170 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 AE4CBC433F5 for ; Sat, 5 Mar 2022 00:37:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230308AbiCEAiZ (ORCPT ); Fri, 4 Mar 2022 19:38:25 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50506 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230283AbiCEAiQ (ORCPT ); Fri, 4 Mar 2022 19:38:16 -0500 Received: from mx0a-00069f02.pphosted.com (mx0a-00069f02.pphosted.com [205.220.165.32]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 9C8E241990; Fri, 4 Mar 2022 16:37:27 -0800 (PST) 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 224KFxd3009042; Sat, 5 Mar 2022 00:37:25 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=from : to : cc : subject : date : message-id : in-reply-to : references; s=corp-2021-07-09; bh=EH1P5KqmZNy/b8Q5rSQhj/sfecFbc94SIsDmOdiOADk=; b=Ej2Wu/N0wDrOZnaRofH0HddUAbbG7rZXsPYGy8oTI3w8wwvE9uVkdRkMJ8Fe0glERMk7 OSB/nTEVL4OOdGBqGTIvGMtDgRBLVrD+RGruFoKeSezyVTRzKO9Hudhpd/OcaHhzw92Y Ja9fgnfNbjXdVC712d4Gz67BUBaXZmNIRHQWsWVKq76u2mQvhhfETnxYtiexqk/3llYn DGaZFHvjoSFcOCBvQoyoamLGWzZsNfz/jQZv+jO+/iFwsICT0OHb8wA5ENRNCQKtfFAm GIYmW8fgxPM3zPL9pjL0GGDPXzGDkozWLIjG7YDA3EiBeCNlKB4gO+LT5DYNz9LjrHqe jg== Received: from aserp3030.oracle.com (aserp3030.oracle.com [141.146.126.71]) by mx0b-00069f02.pphosted.com with ESMTP id 3ek4hv32wd-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Sat, 05 Mar 2022 00:37:25 +0000 Received: from pps.filterd (aserp3030.oracle.com [127.0.0.1]) by aserp3030.oracle.com (8.16.1.2/8.16.1.2) with SMTP id 2250Pw45146626; Sat, 5 Mar 2022 00:37:24 GMT Received: from pps.reinject (localhost [127.0.0.1]) by aserp3030.oracle.com with ESMTP id 3ek4jh9bg8-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Sat, 05 Mar 2022 00:37:24 +0000 Received: from aserp3030.oracle.com (aserp3030.oracle.com [127.0.0.1]) by pps.reinject (8.16.0.36/8.16.0.36) with SMTP id 2250bJaP161402; Sat, 5 Mar 2022 00:37:23 GMT Received: from ca-common-hq.us.oracle.com (ca-common-hq.us.oracle.com [10.211.9.209]) by aserp3030.oracle.com with ESMTP id 3ek4jh9bfb-7; Sat, 05 Mar 2022 00:37:23 +0000 From: Dai Ngo To: chuck.lever@oracle.com, bfields@fieldses.org Cc: jlayton@redhat.com, viro@zeniv.linux.org.uk, linux-nfs@vger.kernel.org, linux-fsdevel@vger.kernel.org Subject: [PATCH RFC v15 06/11] NFSD: Update find_clp_in_name_tree() to handle courtesy clients Date: Fri, 4 Mar 2022 16:37:08 -0800 Message-Id: <1646440633-3542-7-git-send-email-dai.ngo@oracle.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1646440633-3542-1-git-send-email-dai.ngo@oracle.com> References: <1646440633-3542-1-git-send-email-dai.ngo@oracle.com> X-Proofpoint-GUID: AIXrUTd1hSe4UEpk2lItbgNagrR0FBDi X-Proofpoint-ORIG-GUID: AIXrUTd1hSe4UEpk2lItbgNagrR0FBDi Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org Update find_clp_in_name_tree: . skip client with CLIENT_EXPIRED flag; discarded courtesy client. . if courtesy client was found then clear CLIENT_COURTESY and set CLIENT_RECONNECTED so callers can take appropriate action. Update find_confirmed_client_by_name to discard the courtesy client; set CLIENT_EXPIRED. Update nfsd4_setclientid to expire the confirmed courtesy client to prevent multiple confirmed clients with the same name on the the conf_id_hashtbl list. Signed-off-by: Dai Ngo --- fs/nfsd/nfs4state.c | 55 ++++++++++++++++++++++++++++++++++++++++++++++++++--- 1 file changed, 52 insertions(+), 3 deletions(-) diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c index b16f689f34c3..f42d72a8f5ca 100644 --- a/fs/nfsd/nfs4state.c +++ b/fs/nfsd/nfs4state.c @@ -1929,6 +1929,34 @@ __find_in_sessionid_hashtbl(struct nfs4_sessionid *sessionid, struct net *net) return NULL; } +static void +nfsd4_discard_courtesy_clnt(struct nfs4_client *clp) +{ + spin_lock(&clp->cl_cs_lock); + set_bit(NFSD4_CLIENT_EXPIRED, &clp->cl_flags); + spin_unlock(&clp->cl_cs_lock); +} + +static bool +nfs4_is_courtesy_client_expired(struct nfs4_client *clp) +{ + clear_bit(NFSD4_CLIENT_RECONNECTED, &clp->cl_flags); + /* need to sync with thread resolving lock/deleg conflict */ + spin_lock(&clp->cl_cs_lock); + if (test_bit(NFSD4_CLIENT_EXPIRED, &clp->cl_flags)) { + spin_unlock(&clp->cl_cs_lock); + return true; + } + /* + * clear CLIENT_COURTESY flag to prevent it from being + * destroyed by thread trying to resolve conflicts. + */ + if (test_and_clear_bit(NFSD4_CLIENT_COURTESY, &clp->cl_flags)) + set_bit(NFSD4_CLIENT_RECONNECTED, &clp->cl_flags); + spin_unlock(&clp->cl_cs_lock); + return false; +} + static struct nfsd4_session * find_in_sessionid_hashtbl(struct nfs4_sessionid *sessionid, struct net *net, __be32 *ret) @@ -2834,8 +2862,11 @@ find_clp_in_name_tree(struct xdr_netobj *name, struct rb_root *root) node = node->rb_left; else if (cmp < 0) node = node->rb_right; - else + else { + if (nfs4_is_courtesy_client_expired(clp)) + return NULL; return clp; + } } return NULL; } @@ -2914,8 +2945,15 @@ static bool clp_used_exchangeid(struct nfs4_client *clp) static struct nfs4_client * find_confirmed_client_by_name(struct xdr_netobj *name, struct nfsd_net *nn) { + struct nfs4_client *clp; + lockdep_assert_held(&nn->client_lock); - return find_clp_in_name_tree(name, &nn->conf_name_tree); + clp = find_clp_in_name_tree(name, &nn->conf_name_tree); + if (clp && test_bit(NFSD4_CLIENT_RECONNECTED, &clp->cl_flags)) { + nfsd4_discard_courtesy_clnt(clp); + clp = NULL; + } + return clp; } static struct nfs4_client * @@ -4032,12 +4070,19 @@ nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfs4_client *unconf = NULL; __be32 status; struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id); + struct nfs4_client *cclient = NULL; new = create_client(clname, rqstp, &clverifier); if (new == NULL) return nfserr_jukebox; spin_lock(&nn->client_lock); - conf = find_confirmed_client_by_name(&clname, nn); + /* find confirmed client by name */ + conf = find_clp_in_name_tree(&clname, &nn->conf_name_tree); + if (conf && test_bit(NFSD4_CLIENT_RECONNECTED, &conf->cl_flags)) { + cclient = conf; + conf = NULL; + } + if (conf && client_has_state(conf)) { status = nfserr_clid_inuse; if (clp_used_exchangeid(conf)) @@ -4068,7 +4113,11 @@ nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, new = NULL; status = nfs_ok; out: + if (cclient) + unhash_client_locked(cclient); spin_unlock(&nn->client_lock); + if (cclient) + expire_client(cclient); if (new) free_client(new); if (unconf) {