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Commit c9a49628 authored by Stanislav Kinsbursky's avatar Stanislav Kinsbursky Committed by J. Bruce Fields
Browse files

nfsd: make client_lock per net 



This lock protects the client lru list and session hash table, which are
allocated per network namespace already.

Signed-off-by: default avatarStanislav Kinsbursky <skinsbursky@parallels.com>
Signed-off-by: default avatarJ. Bruce Fields <bfields@redhat.com>
parent ec28e02c

fs/nfsd/netns.h

+3 −0
Original line number Diff line number Diff line
@@ -81,6 +81,9 @@ struct nfsd_net { 
	struct list_head close_lru;



	struct delayed_work laundromat_work;



	/* client_lock protects the client lru list and session hash table */

	spinlock_t client_lock;

};



extern int nfsd_net_id;

fs/nfsd/nfs4state.c

+43 −30
Original line number Diff line number Diff line
@@ -388,9 +388,6 @@ unhash_delegation(struct nfs4_delegation *dp) 
 * SETCLIENTID state 

 */



/* client_lock protects the client lru list and session hash table */

static DEFINE_SPINLOCK(client_lock);



static unsigned int clientid_hashval(u32 id)

{

	return id & CLIENT_HASH_MASK;
@@ -872,18 +869,23 @@ static void __free_session(struct nfsd4_session *ses) 
static void free_session(struct kref *kref)

{

	struct nfsd4_session *ses;

	struct nfsd_net *nn;



	lockdep_assert_held(&client_lock);

	ses = container_of(kref, struct nfsd4_session, se_ref);

	nn = net_generic(ses->se_client->net, nfsd_net_id);



	lockdep_assert_held(&nn->client_lock);

	nfsd4_del_conns(ses);

	__free_session(ses);

}



void nfsd4_put_session(struct nfsd4_session *ses)

{

	spin_lock(&client_lock);

	struct nfsd_net *nn = net_generic(ses->se_client->net, nfsd_net_id);



	spin_lock(&nn->client_lock);

	nfsd4_put_session_locked(ses);

	spin_unlock(&client_lock);

	spin_unlock(&nn->client_lock);

}



static struct nfsd4_session *alloc_session(struct nfsd4_channel_attrs *fchan)
@@ -927,12 +929,12 @@ static void init_session(struct svc_rqst *rqstp, struct nfsd4_session *new, stru 
	new->se_cb_sec = cses->cb_sec;

	kref_init(&new->se_ref);

	idx = hash_sessionid(&new->se_sessionid);

	spin_lock(&client_lock);

	spin_lock(&nn->client_lock);

	list_add(&new->se_hash, &nn->sessionid_hashtbl[idx]);

	spin_lock(&clp->cl_lock);

	list_add(&new->se_perclnt, &clp->cl_sessions);

	spin_unlock(&clp->cl_lock);

	spin_unlock(&client_lock);

	spin_unlock(&nn->client_lock);



	if (cses->flags & SESSION4_BACK_CHAN) {

		struct sockaddr *sa = svc_addr(rqstp);
@@ -1005,9 +1007,11 @@ renew_client_locked(struct nfs4_client *clp) 
static inline void

renew_client(struct nfs4_client *clp)

{

	spin_lock(&client_lock);

	struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);



	spin_lock(&nn->client_lock);

	renew_client_locked(clp);

	spin_unlock(&client_lock);

	spin_unlock(&nn->client_lock);

}



/* SETCLIENTID and SETCLIENTID_CONFIRM Helper functions */
@@ -1045,7 +1049,9 @@ static struct nfs4_client *alloc_client(struct xdr_netobj name) 
static inline void

free_client(struct nfs4_client *clp)

{

	lockdep_assert_held(&client_lock);

	struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);



	lockdep_assert_held(&nn->client_lock);

	while (!list_empty(&clp->cl_sessions)) {

		struct nfsd4_session *ses;

		ses = list_entry(clp->cl_sessions.next, struct nfsd4_session,
@@ -1062,15 +1068,16 @@ void 
release_session_client(struct nfsd4_session *session)

{

	struct nfs4_client *clp = session->se_client;

	struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);



	if (!atomic_dec_and_lock(&clp->cl_refcount, &client_lock))

	if (!atomic_dec_and_lock(&clp->cl_refcount, &nn->client_lock))

		return;

	if (is_client_expired(clp)) {

		free_client(clp);

		session->se_client = NULL;

	} else

		renew_client_locked(clp);

	spin_unlock(&client_lock);

	spin_unlock(&nn->client_lock);

}



/* must be called under the client_lock */
@@ -1119,11 +1126,11 @@ destroy_client(struct nfs4_client *clp) 
		rb_erase(&clp->cl_namenode, &nn->conf_name_tree);

	else

		rb_erase(&clp->cl_namenode, &nn->unconf_name_tree);

	spin_lock(&client_lock);

	spin_lock(&nn->client_lock);

	unhash_client_locked(clp);

	if (atomic_read(&clp->cl_refcount) == 0)

		free_client(clp);

	spin_unlock(&client_lock);

	spin_unlock(&nn->client_lock);

}



static void expire_client(struct nfs4_client *clp)
@@ -1274,6 +1281,7 @@ static struct nfs4_client *create_client(struct xdr_netobj name, 
	struct sockaddr *sa = svc_addr(rqstp);

	int ret;

	struct net *net = SVC_NET(rqstp);

	struct nfsd_net *nn = net_generic(net, nfsd_net_id);



	clp = alloc_client(name);

	if (clp == NULL)
@@ -1282,9 +1290,9 @@ static struct nfs4_client *create_client(struct xdr_netobj name, 
	INIT_LIST_HEAD(&clp->cl_sessions);

	ret = copy_cred(&clp->cl_cred, &rqstp->rq_cred);

	if (ret) {

		spin_lock(&client_lock);

		spin_lock(&nn->client_lock);

		free_client(clp);

		spin_unlock(&client_lock);

		spin_unlock(&nn->client_lock);

		return NULL;

	}

	idr_init(&clp->cl_stateids);
@@ -1873,11 +1881,12 @@ static __be32 nfsd4_map_bcts_dir(u32 *dir) 
__be32 nfsd4_backchannel_ctl(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_backchannel_ctl *bc)

{

	struct nfsd4_session *session = cstate->session;

	struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);



	spin_lock(&client_lock);

	spin_lock(&nn->client_lock);

	session->se_cb_prog = bc->bc_cb_program;

	session->se_cb_sec = bc->bc_cb_sec;

	spin_unlock(&client_lock);

	spin_unlock(&nn->client_lock);



	nfsd4_probe_callback(session->se_client);
@@ -1890,10 +1899,11 @@ __be32 nfsd4_bind_conn_to_session(struct svc_rqst *rqstp, 
{

	__be32 status;

	struct nfsd4_conn *conn;

	struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);



	if (!nfsd4_last_compound_op(rqstp))

		return nfserr_not_only_op;

	spin_lock(&client_lock);

	spin_lock(&nn->client_lock);

	cstate->session = find_in_sessionid_hashtbl(&bcts->sessionid, SVC_NET(rqstp));

	/* Sorta weird: we only need the refcnt'ing because new_conn acquires

	 * client_lock iself: */
@@ -1901,7 +1911,7 @@ __be32 nfsd4_bind_conn_to_session(struct svc_rqst *rqstp, 
		nfsd4_get_session(cstate->session);

		atomic_inc(&cstate->session->se_client->cl_refcount);

	}

	spin_unlock(&client_lock);

	spin_unlock(&nn->client_lock);

	if (!cstate->session)

		return nfserr_badsession;
@@ -1929,6 +1939,7 @@ nfsd4_destroy_session(struct svc_rqst *r, 
{

	struct nfsd4_session *ses;

	__be32 status = nfserr_badsession;

	struct nfsd_net *nn = net_generic(SVC_NET(r), nfsd_net_id);



	/* Notes:

	 * - The confirmed nfs4_client->cl_sessionid holds destroyed sessinid
@@ -1942,24 +1953,24 @@ nfsd4_destroy_session(struct svc_rqst *r, 
			return nfserr_not_only_op;

	}

	dump_sessionid(__func__, &sessionid->sessionid);

	spin_lock(&client_lock);

	spin_lock(&nn->client_lock);

	ses = find_in_sessionid_hashtbl(&sessionid->sessionid, SVC_NET(r));

	if (!ses) {

		spin_unlock(&client_lock);

		spin_unlock(&nn->client_lock);

		goto out;

	}



	unhash_session(ses);

	spin_unlock(&client_lock);

	spin_unlock(&nn->client_lock);



	nfs4_lock_state();

	nfsd4_probe_callback_sync(ses->se_client);

	nfs4_unlock_state();



	spin_lock(&client_lock);

	spin_lock(&nn->client_lock);

	nfsd4_del_conns(ses);

	nfsd4_put_session_locked(ses);

	spin_unlock(&client_lock);

	spin_unlock(&nn->client_lock);

	status = nfs_ok;

out:

	dprintk("%s returns %d\n", __func__, ntohl(status));
@@ -2025,6 +2036,7 @@ nfsd4_sequence(struct svc_rqst *rqstp, 
	struct nfsd4_slot *slot;

	struct nfsd4_conn *conn;

	__be32 status;

	struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);



	if (resp->opcnt != 1)

		return nfserr_sequence_pos;
@@ -2037,7 +2049,7 @@ nfsd4_sequence(struct svc_rqst *rqstp, 
	if (!conn)

		return nfserr_jukebox;



	spin_lock(&client_lock);

	spin_lock(&nn->client_lock);

	status = nfserr_badsession;

	session = find_in_sessionid_hashtbl(&seq->sessionid, SVC_NET(rqstp));

	if (!session)
@@ -2113,7 +2125,7 @@ out: 
		}

	}

	kfree(conn);

	spin_unlock(&client_lock);

	spin_unlock(&nn->client_lock);

	dprintk("%s: return %d\n", __func__, ntohl(status));

	return status;

}
@@ -3191,7 +3203,7 @@ nfs4_laundromat(struct nfsd_net *nn) 
	dprintk("NFSD: laundromat service - starting\n");

	nfsd4_end_grace(nn);

	INIT_LIST_HEAD(&reaplist);

	spin_lock(&client_lock);

	spin_lock(&nn->client_lock);

	list_for_each_safe(pos, next, &nn->client_lru) {

		clp = list_entry(pos, struct nfs4_client, cl_lru);

		if (time_after((unsigned long)clp->cl_time, (unsigned long)cutoff)) {
@@ -3208,7 +3220,7 @@ nfs4_laundromat(struct nfsd_net *nn) 
		unhash_client_locked(clp);

		list_add(&clp->cl_lru, &reaplist);

	}

	spin_unlock(&client_lock);

	spin_unlock(&nn->client_lock);

	list_for_each_safe(pos, next, &reaplist) {

		clp = list_entry(pos, struct nfs4_client, cl_lru);

		dprintk("NFSD: purging unused client (clientid %08x)\n",
@@ -4796,6 +4808,7 @@ static int nfs4_state_start_net(struct net *net) 
	nn->unconf_name_tree = RB_ROOT;

	INIT_LIST_HEAD(&nn->client_lru);

	INIT_LIST_HEAD(&nn->close_lru);

	spin_lock_init(&nn->client_lock);



	INIT_DELAYED_WORK(&nn->laundromat_work, laundromat_main);