NFSv4: Callers to nfs4_get_renew_cred() need to hold nfs_client->cl_lock

Ditto for nfs4_get_setclientid_cred().

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

diff --git a/fs/nfs/nfs4_fs.h b/fs/nfs/nfs4_fs.h
index ea79064..0ac6bbb 100644 (file)
--- a/fs/nfs/nfs4_fs.h
+++ b/fs/nfs/nfs4_fs.h
@@ -202,7 +202,7 @@ extern void nfs4_kill_renewd(struct nfs_client *);
 extern void nfs4_renew_state(struct work_struct *);
 
 /* nfs4state.c */
-struct rpc_cred *nfs4_get_renew_cred(struct nfs_client *clp);
+struct rpc_cred *nfs4_get_renew_cred_locked(struct nfs_client *clp);
 
 extern struct nfs4_state_owner * nfs4_get_state_owner(struct nfs_server *, struct rpc_cred *);
 extern void nfs4_put_state_owner(struct nfs4_state_owner *);

diff --git a/fs/nfs/nfs4renewd.c b/fs/nfs/nfs4renewd.c
index 3305acb..9fe8640 100644 (file)
--- a/fs/nfs/nfs4renewd.c
+++ b/fs/nfs/nfs4renewd.c
@@ -77,7 +77,7 @@ nfs4_renew_state(struct work_struct *work)
        timeout = (2 * lease) / 3 + (long)last - (long)now;
        /* Are we close to a lease timeout? */
        if (time_after(now, last + lease/3)) {
-               cred = nfs4_get_renew_cred(clp);
+               cred = nfs4_get_renew_cred_locked(clp);
                if (cred == NULL) {
                        set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
                        spin_unlock(&clp->cl_lock);

diff --git a/fs/nfs/nfs4state.c b/fs/nfs/nfs4state.c
index 99182b3..300faba 100644 (file)
--- a/fs/nfs/nfs4state.c
+++ b/fs/nfs/nfs4state.c
@@ -71,14 +71,12 @@ static int nfs4_init_client(struct nfs_client *clp, struct rpc_cred *cred)
        return status;
 }
 
-static struct rpc_cred *nfs4_get_machine_cred(struct nfs_client *clp)
+static struct rpc_cred *nfs4_get_machine_cred_locked(struct nfs_client *clp)
 {
        struct rpc_cred *cred = NULL;
 
-       spin_lock(&clp->cl_lock);
        if (clp->cl_machine_cred != NULL)
                cred = get_rpccred(clp->cl_machine_cred);
-       spin_unlock(&clp->cl_lock);
        return cred;
 }
 
@@ -94,7 +92,7 @@ static void nfs4_clear_machine_cred(struct nfs_client *clp)
                put_rpccred(cred);
 }
 
-struct rpc_cred *nfs4_get_renew_cred(struct nfs_client *clp)
+struct rpc_cred *nfs4_get_renew_cred_locked(struct nfs_client *clp)
 {
        struct nfs4_state_owner *sp;
        struct rb_node *pos;
@@ -110,13 +108,24 @@ struct rpc_cred *nfs4_get_renew_cred(struct nfs_client *clp)
        return cred;
 }
 
+static struct rpc_cred *nfs4_get_renew_cred(struct nfs_client *clp)
+{
+       struct rpc_cred *cred;
+
+       spin_lock(&clp->cl_lock);
+       cred = nfs4_get_renew_cred_locked(clp);
+       spin_unlock(&clp->cl_lock);
+       return cred;
+}
+
 static struct rpc_cred *nfs4_get_setclientid_cred(struct nfs_client *clp)
 {
        struct nfs4_state_owner *sp;
        struct rb_node *pos;
        struct rpc_cred *cred;
 
-       cred = nfs4_get_machine_cred(clp);
+       spin_lock(&clp->cl_lock);
+       cred = nfs4_get_machine_cred_locked(clp);
        if (cred != NULL)
                goto out;
        pos = rb_first(&clp->cl_state_owners);
@@ -125,6 +134,7 @@ static struct rpc_cred *nfs4_get_setclientid_cred(struct nfs_client *clp)
                cred = get_rpccred(sp->so_cred);
        }
 out:
+       spin_unlock(&clp->cl_lock);
        return cred;
 }