Return-Path: linux-nfs-owner@vger.kernel.org Received: from mail-qc0-f182.google.com ([209.85.216.182]:49508 "EHLO mail-qc0-f182.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757787AbaFSOwr (ORCPT ); Thu, 19 Jun 2014 10:52:47 -0400 Received: by mail-qc0-f182.google.com with SMTP id m20so2235277qcx.41 for ; Thu, 19 Jun 2014 07:52:46 -0700 (PDT) From: Jeff Layton To: bfields@fieldses.org Cc: linux-nfs@vger.kernel.org Subject: [PATCH v1 075/104] NFSd: Add assertions to document the nfs4_client/session locking Date: Thu, 19 Jun 2014 10:50:21 -0400 Message-Id: <1403189450-18729-76-git-send-email-jlayton@primarydata.com> In-Reply-To: <1403189450-18729-1-git-send-email-jlayton@primarydata.com> References: <1403189450-18729-1-git-send-email-jlayton@primarydata.com> Sender: linux-nfs-owner@vger.kernel.org List-ID: From: Trond Myklebust Signed-off-by: Trond Myklebust --- fs/nfsd/nfs4state.c | 30 ++++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+) diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c index 6e6d34111f5f..72ca1b62cf16 100644 --- a/fs/nfsd/nfs4state.c +++ b/fs/nfsd/nfs4state.c @@ -145,6 +145,10 @@ static __be32 mark_client_expired_locked(struct nfs4_client *clp) static __be32 get_client_locked(struct nfs4_client *clp) { + struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); + + lockdep_assert_held(&nn->client_lock); + if (is_client_expired(clp)) return nfserr_expired; atomic_inc(&clp->cl_refcount); @@ -185,6 +189,10 @@ renew_client(struct nfs4_client *clp) static void put_client_renew_locked(struct nfs4_client *clp) { + struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); + + lockdep_assert_held(&nn->client_lock); + if (!atomic_dec_and_test(&clp->cl_refcount)) return; if (!is_client_expired(clp)) @@ -216,6 +224,9 @@ static __be32 nfsd4_get_session_locked(struct nfsd4_session *ses) static void nfsd4_put_session_locked(struct nfsd4_session *ses) { struct nfs4_client *clp = ses->se_client; + struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); + + lockdep_assert_held(&nn->client_lock); if (atomic_dec_and_test(&ses->se_ref) && is_session_dead(ses)) free_session(ses); @@ -1262,6 +1273,8 @@ __find_in_sessionid_hashtbl(struct nfs4_sessionid *sessionid, struct net *net) int idx; struct nfsd_net *nn = net_generic(net, nfsd_net_id); + lockdep_assert_held(&nn->client_lock); + dump_sessionid(__func__, sessionid); idx = hash_sessionid(sessionid); /* Search in the appropriate list */ @@ -1298,6 +1311,11 @@ out: static void unhash_session(struct nfsd4_session *ses) { + struct nfs4_client *clp = ses->se_client; + struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); + + lockdep_assert_held(&nn->client_lock); + list_del(&ses->se_hash); spin_lock(&ses->se_client->cl_lock); list_del(&ses->se_perclnt); @@ -1386,6 +1404,8 @@ unhash_client_locked(struct nfs4_client *clp) struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); struct nfsd4_session *ses; + lockdep_assert_held(&nn->client_lock); + /* Mark the client as expired! */ clp->cl_time = 0; /* Make it invisible */ @@ -1727,6 +1747,8 @@ add_to_unconfirmed(struct nfs4_client *clp) unsigned int idhashval; struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); + lockdep_assert_held(&nn->client_lock); + clear_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags); add_clp_to_name_tree(clp, &nn->unconf_name_tree); idhashval = clientid_hashval(clp->cl_clientid.cl_id); @@ -1740,6 +1762,8 @@ move_to_confirmed(struct nfs4_client *clp) unsigned int idhashval = clientid_hashval(clp->cl_clientid.cl_id); struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); + lockdep_assert_held(&nn->client_lock); + dprintk("NFSD: move_to_confirm nfs4_client %p\n", clp); list_move(&clp->cl_idhash, &nn->conf_id_hashtbl[idhashval]); rb_erase(&clp->cl_namenode, &nn->unconf_name_tree); @@ -1770,6 +1794,7 @@ find_confirmed_client(clientid_t *clid, bool sessions, struct nfsd_net *nn) { struct list_head *tbl = nn->conf_id_hashtbl; + lockdep_assert_held(&nn->client_lock); return find_client_in_id_table(tbl, clid, sessions); } @@ -1778,6 +1803,7 @@ find_unconfirmed_client(clientid_t *clid, bool sessions, struct nfsd_net *nn) { struct list_head *tbl = nn->unconf_id_hashtbl; + lockdep_assert_held(&nn->client_lock); return find_client_in_id_table(tbl, clid, sessions); } @@ -1789,12 +1815,14 @@ 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) { + lockdep_assert_held(&nn->client_lock); return find_clp_in_name_tree(name, &nn->conf_name_tree); } static struct nfs4_client * find_unconfirmed_client_by_name(struct xdr_netobj *name, struct nfsd_net *nn) { + lockdep_assert_held(&nn->client_lock); return find_clp_in_name_tree(name, &nn->unconf_name_tree); } @@ -4758,6 +4786,8 @@ find_lockowner_str_locked(clientid_t *clid, struct xdr_netobj *owner, unsigned int strhashval = ownerstr_hashval(owner); struct nfs4_stateowner *so; + lockdep_assert_held(&clp->cl_lock); + list_for_each_entry(so, &clp->cl_ownerstr_hashtbl[strhashval], so_strhash) { if (so->so_is_open_owner) continue; -- 1.9.3