Return-Path: linux-nfs-owner@vger.kernel.org Received: from mail-qa0-f46.google.com ([209.85.216.46]:39603 "EHLO mail-qa0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754671AbaG3M1z (ORCPT ); Wed, 30 Jul 2014 08:27:55 -0400 Received: by mail-qa0-f46.google.com with SMTP id v10so1182695qac.19 for ; Wed, 30 Jul 2014 05:27:54 -0700 (PDT) From: Jeff Layton To: bfields@fieldses.org Cc: linux-nfs@vger.kernel.org, hch@infradead.org, Trond Myklebust Subject: [PATCH 07/37] nfsd: Protect nfsd4_destroy_clientid using client_lock Date: Wed, 30 Jul 2014 08:27:08 -0400 Message-Id: <1406723258-8512-8-git-send-email-jlayton@primarydata.com> In-Reply-To: <1406723258-8512-1-git-send-email-jlayton@primarydata.com> References: <1406723258-8512-1-git-send-email-jlayton@primarydata.com> Sender: linux-nfs-owner@vger.kernel.org List-ID: From: Trond Myklebust ...instead of relying on the client_mutex. Signed-off-by: Trond Myklebust --- fs/nfsd/nfs4state.c | 13 +++++++++---- 1 file changed, 9 insertions(+), 4 deletions(-) diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c index 52a4677f6f35..68383b09c7dc 100644 --- a/fs/nfsd/nfs4state.c +++ b/fs/nfsd/nfs4state.c @@ -2826,22 +2826,23 @@ nfsd4_sequence_done(struct nfsd4_compoundres *resp) __be32 nfsd4_destroy_clientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_destroy_clientid *dc) { - struct nfs4_client *conf, *unconf, *clp; + struct nfs4_client *conf, *unconf; + struct nfs4_client *clp = NULL; __be32 status = 0; struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id); nfs4_lock_state(); + spin_lock(&nn->client_lock); unconf = find_unconfirmed_client(&dc->clientid, true, nn); conf = find_confirmed_client(&dc->clientid, true, nn); WARN_ON_ONCE(conf && unconf); if (conf) { - clp = conf; - if (client_has_state(conf)) { status = nfserr_clientid_busy; goto out; } + clp = conf; } else if (unconf) clp = unconf; else { @@ -2849,12 +2850,16 @@ nfsd4_destroy_clientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *csta goto out; } if (!mach_creds_match(clp, rqstp)) { + clp = NULL; status = nfserr_wrong_cred; goto out; } - expire_client(clp); + unhash_client_locked(clp); out: + spin_unlock(&nn->client_lock); nfs4_unlock_state(); + if (clp) + expire_client(clp); return status; } -- 1.9.3