Return-Path: linux-nfs-owner@vger.kernel.org Received: from mail-qc0-f173.google.com ([209.85.216.173]:46931 "EHLO mail-qc0-f173.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932489AbaGUPDv (ORCPT ); Mon, 21 Jul 2014 11:03:51 -0400 Received: by mail-qc0-f173.google.com with SMTP id c9so5606663qcz.4 for ; Mon, 21 Jul 2014 08:03:50 -0700 (PDT) From: Jeff Layton To: bfields@fieldses.org Cc: linux-nfs@vger.kernel.org, hch@infradead.org Subject: [PATCH 36/40] nfsd: add locking to stateowner release Date: Mon, 21 Jul 2014 11:02:48 -0400 Message-Id: <1405954972-28904-37-git-send-email-jlayton@primarydata.com> In-Reply-To: <1405954972-28904-1-git-send-email-jlayton@primarydata.com> References: <1405954972-28904-1-git-send-email-jlayton@primarydata.com> Sender: linux-nfs-owner@vger.kernel.org List-ID: Once we remove the client_mutex, we'll need to properly protect the stateowner reference counts using the cl_lock. Signed-off-by: Jeff Layton --- fs/nfsd/nfs4state.c | 15 ++++++--------- 1 file changed, 6 insertions(+), 9 deletions(-) diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c index 95eb5547f46e..0281b87b77dd 100644 --- a/fs/nfsd/nfs4state.c +++ b/fs/nfsd/nfs4state.c @@ -3041,9 +3041,14 @@ static inline void *alloc_stateowner(struct kmem_cache *slab, struct xdr_netobj static void nfs4_put_stateowner(struct nfs4_stateowner *sop) { - if (!atomic_dec_and_test(&sop->so_count)) + struct nfs4_client *clp = sop->so_client; + + might_lock(&clp->cl_lock); + + if (!atomic_dec_and_lock(&sop->so_count, &clp->cl_lock)) return; sop->so_unhash(sop); + spin_unlock(&clp->cl_lock); sop->so_free(sop); } @@ -3058,11 +3063,7 @@ static void hash_openowner(struct nfs4_openowner *oo, struct nfs4_client *clp, u static void nfs4_unhash_openowner(struct nfs4_stateowner *so) { - struct nfs4_client *clp = so->so_client; - - spin_lock(&clp->cl_lock); unhash_openowner_locked(openowner(so)); - spin_unlock(&clp->cl_lock); } static void nfs4_free_openowner(struct nfs4_stateowner *so) @@ -4861,11 +4862,7 @@ find_lockowner_str(clientid_t *clid, struct xdr_netobj *owner, static void nfs4_unhash_lockowner(struct nfs4_stateowner *sop) { - struct nfs4_client *clp = sop->so_client; - - spin_lock(&clp->cl_lock); unhash_lockowner_locked(lockowner(sop)); - spin_unlock(&clp->cl_lock); } static void nfs4_free_lockowner(struct nfs4_stateowner *sop) -- 1.9.3