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Thu, 26 Jun 2014 12:21:35 -0700 (PDT) From: Jeff Layton To: bfields@fieldses.org Cc: linux-nfs@vger.kernel.org, Trond Myklebust Subject: [PATCH v2 088/117] nfsd: Add lockdep assertions to document the nfs4_client/session locking Date: Thu, 26 Jun 2014 15:20:56 -0400 Message-Id: <1403810485-16497-5-git-send-email-jlayton@primarydata.com> X-Mailer: git-send-email 1.9.3 In-Reply-To: <1403810017-16062-1-git-send-email-jlayton@primarydata.com> References: <1403810017-16062-1-git-send-email-jlayton@primarydata.com> Sender: linux-nfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-nfs@vger.kernel.org X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, T_RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=ham version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Trond Myklebust Signed-off-by: Trond Myklebust Signed-off-by: Jeff Layton --- fs/nfsd/nfs4state.c | 30 ++++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+) diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c index e81c97435f7f..f49def48464d 100644 --- a/fs/nfsd/nfs4state.c +++ b/fs/nfsd/nfs4state.c @@ -146,6 +146,10 @@ 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); @@ -186,6 +190,10 @@ 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)) @@ -217,6 +225,9 @@ 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); @@ -1399,6 +1410,8 @@ __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 */ @@ -1435,6 +1448,11 @@ 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); @@ -1523,6 +1541,8 @@ 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 */ @@ -1852,6 +1872,8 @@ 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); @@ -1865,6 +1887,8 @@ 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); @@ -1895,6 +1919,7 @@ 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); } @@ -1903,6 +1928,7 @@ 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); } @@ -1914,12 +1940,14 @@ 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); } @@ -4874,6 +4902,8 @@ 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)