From patchwork Wed Feb 23 18:16:33 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dai Ngo X-Patchwork-Id: 12757283 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 EB7C9C433EF for ; Wed, 23 Feb 2022 18:18:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S242155AbiBWSRR (ORCPT ); Wed, 23 Feb 2022 13:17:17 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47152 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S243616AbiBWSRO (ORCPT ); Wed, 23 Feb 2022 13:17:14 -0500 Received: from mx0b-00069f02.pphosted.com (mx0b-00069f02.pphosted.com [205.220.177.32]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 07CD83F32A for ; Wed, 23 Feb 2022 10:16:45 -0800 (PST) Received: from pps.filterd (m0246632.ppops.net [127.0.0.1]) by mx0b-00069f02.pphosted.com (8.16.1.2/8.16.1.2) with SMTP id 21NIDlCx029459; Wed, 23 Feb 2022 18:16:45 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=rIJPt+A+ak4PFGluCnj/+PVYjxKV1SP6JJRbkBtsgW4=; b=Kf91I2WfH8YrJCa4TFuROu3hxx0ypf1aSXN+ErDxrUJQ8g5IU8Cgx13sgkB5jascsqfi PLnt9v+LmQu/aK45zw+LhU8yh3xdfAqIQdeiQgGXUAdStLDmBl7tCklNrUKepB/Qz732 K9uFRfNaj8pC/9hcOOAjxXBZr3VmRtWgyBxlxjt/BIRF05Zi9ITmCyYAP8BhgTFZrrHr OT0lZ8Bs7gRHRRqdF7+qf2mRrT7xSEyvEA7bySlKfqY+iv0xRGIYxFZdtjs9ztQy/u8H fMYwxe5fO3i5Vuqrd8rr+ohl9iHM0nrVEfIbG4bX50yvCzt2dSVgAX2wIRkynsK905/n 4Q== Received: from aserp3030.oracle.com (aserp3030.oracle.com [141.146.126.71]) by mx0b-00069f02.pphosted.com with ESMTP id 3ectsx54ux-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 23 Feb 2022 18:16:44 +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 21NIAtfh155954; Wed, 23 Feb 2022 18:16:44 GMT Received: from pps.reinject (localhost [127.0.0.1]) by aserp3030.oracle.com with ESMTP id 3eapkj17rw-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 23 Feb 2022 18:16:44 +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 21NICxfc162308; Wed, 23 Feb 2022 18:16:43 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 3eapkj17pe-7; Wed, 23 Feb 2022 18:16:43 +0000 From: Dai Ngo To: chuck.lever@oracle.com, bfields@fieldses.org Cc: linux-nfs@vger.kernel.org Subject: [PATCH RFC v14 06/10] NFSD: Update find_in_sessionid_hashtbl() to handle courtesy clients Date: Wed, 23 Feb 2022 10:16:33 -0800 Message-Id: <1645640197-1725-7-git-send-email-dai.ngo@oracle.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1645640197-1725-1-git-send-email-dai.ngo@oracle.com> References: <1645640197-1725-1-git-send-email-dai.ngo@oracle.com> X-Proofpoint-ORIG-GUID: -o8b47xDglb3_VyqKRxdXIKO3CJB_YpV X-Proofpoint-GUID: -o8b47xDglb3_VyqKRxdXIKO3CJB_YpV Precedence: bulk List-ID: X-Mailing-List: linux-nfs@vger.kernel.org Update find_in_sessionid_hashtbl to: . 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 nfsd4_sequence and nfsd4_bind_conn_to_session to create client record for client with CLIENT_RECONNECTED set. Update nfsd4_destroy_session to discard client with CLIENT_RECONNECTED set. Signed-off-by: Dai Ngo --- fs/nfsd/nfs4state.c | 44 +++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 43 insertions(+), 1 deletion(-) diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c index 4990553180f8..5cef1a78cc28 100644 --- a/fs/nfsd/nfs4state.c +++ b/fs/nfsd/nfs4state.c @@ -1935,10 +1935,31 @@ find_in_sessionid_hashtbl(struct nfs4_sessionid *sessionid, struct net *net, { struct nfsd4_session *session; __be32 status = nfserr_badsession; + struct nfs4_client *clp; session = __find_in_sessionid_hashtbl(sessionid, net); if (!session) goto out; + clp = session->se_client; + if (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); + session = NULL; + goto out; + } + if (test_bit(NFSD4_CLIENT_COURTESY, &clp->cl_flags)) { + /* + * clear CLIENT_COURTESY flag to prevent it from being + * destroyed by thread trying to resolve conflicts. + */ + clear_bit(NFSD4_CLIENT_COURTESY, &clp->cl_flags); + set_bit(NFSD4_CLIENT_RECONNECTED, &clp->cl_flags); + } + spin_unlock(&clp->cl_cs_lock); + } status = nfsd4_get_session_locked(session); if (status) session = NULL; @@ -3661,6 +3682,7 @@ __be32 nfsd4_bind_conn_to_session(struct svc_rqst *rqstp, struct nfsd4_session *session; struct net *net = SVC_NET(rqstp); struct nfsd_net *nn = net_generic(net, nfsd_net_id); + struct nfs4_client *clp; if (!nfsd4_last_compound_op(rqstp)) return nfserr_not_only_op; @@ -3693,6 +3715,13 @@ __be32 nfsd4_bind_conn_to_session(struct svc_rqst *rqstp, nfsd4_init_conn(rqstp, conn, session); status = nfs_ok; out: + clp = session->se_client; + if (test_bit(NFSD4_CLIENT_RECONNECTED, &clp->cl_flags)) { + if (status == nfs_ok) + nfsd4_client_record_create(clp); + else + nfsd4_discard_courtesy_clnt(clp); + } nfsd4_put_session(session); out_no_session: return status; @@ -3715,6 +3744,7 @@ nfsd4_destroy_session(struct svc_rqst *r, struct nfsd4_compound_state *cstate, int ref_held_by_me = 0; struct net *net = SVC_NET(r); struct nfsd_net *nn = net_generic(net, nfsd_net_id); + struct nfs4_client *clp; status = nfserr_not_only_op; if (nfsd4_compound_in_session(cstate, sessionid)) { @@ -3727,6 +3757,12 @@ nfsd4_destroy_session(struct svc_rqst *r, struct nfsd4_compound_state *cstate, ses = find_in_sessionid_hashtbl(sessionid, net, &status); if (!ses) goto out_client_lock; + clp = ses->se_client; + if (test_bit(NFSD4_CLIENT_RECONNECTED, &clp->cl_flags)) { + status = nfserr_badsession; + nfsd4_discard_courtesy_clnt(clp); + goto out_put_session; + } status = nfserr_wrong_cred; if (!nfsd4_mach_creds_match(ses->se_client, r)) goto out_put_session; @@ -3831,7 +3867,7 @@ nfsd4_sequence(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_compoundres *resp = rqstp->rq_resp; struct xdr_stream *xdr = resp->xdr; struct nfsd4_session *session; - struct nfs4_client *clp; + struct nfs4_client *clp = NULL; struct nfsd4_slot *slot; struct nfsd4_conn *conn; __be32 status; @@ -3941,6 +3977,12 @@ nfsd4_sequence(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, if (conn) free_conn(conn); spin_unlock(&nn->client_lock); + if (clp && test_bit(NFSD4_CLIENT_RECONNECTED, &clp->cl_flags)) { + if (status == nfs_ok) + nfsd4_client_record_create(clp); + else + nfsd4_discard_courtesy_clnt(clp); + } return status; out_put_session: nfsd4_put_session_locked(session);