nfsd41: free_session/free_client must be called under the client_lock

The session client is manipulated under the client_lock hence
both free_session and nfsd4_del_conns must be called under this lock.

This patch adds a BUG_ON that checks this condition in the
respective functions and implements the missing locks.

nfsd4_{get,put}_session helpers were moved to the C file that uses them
so to prevent use from external files and an unlocked version of
nfsd4_put_session is provided for external use from nfs4xdr.c

Signed-off-by: Benny Halevy <bhalevy@tonian.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>

diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index 97dd2c7..8670863 100644 (file)
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -95,6 +95,19 @@ nfs4_lock_state(void)
        mutex_lock(&client_mutex);
 }
 
+static void free_session(struct kref *);
+
+/* Must be called under the client_lock */
+static void nfsd4_put_session_locked(struct nfsd4_session *ses)
+{
+       kref_put(&ses->se_ref, free_session);
+}
+
+static void nfsd4_get_session(struct nfsd4_session *ses)
+{
+       kref_get(&ses->se_ref);
+}
+
 void
 nfs4_unlock_state(void)
 {
@@ -836,11 +849,12 @@ static void nfsd4_del_conns(struct nfsd4_session *s)
        spin_unlock(&clp->cl_lock);
 }
 
-void free_session(struct kref *kref)
+static void free_session(struct kref *kref)
 {
        struct nfsd4_session *ses;
        int mem;
 
+       BUG_ON(!spin_is_locked(&client_lock));
        ses = container_of(kref, struct nfsd4_session, se_ref);
        nfsd4_del_conns(ses);
        spin_lock(&nfsd_drc_lock);
@@ -851,6 +865,13 @@ void free_session(struct kref *kref)
        kfree(ses);
 }
 
+void nfsd4_put_session(struct nfsd4_session *ses)
+{
+       spin_lock(&client_lock);
+       nfsd4_put_session_locked(ses);
+       spin_unlock(&client_lock);
+}
+
 static struct nfsd4_session *alloc_init_session(struct svc_rqst *rqstp, struct nfs4_client *clp, struct nfsd4_create_session *cses)
 {
        struct nfsd4_session *new;
@@ -898,7 +919,9 @@ static struct nfsd4_session *alloc_init_session(struct svc_rqst *rqstp, struct n
        status = nfsd4_new_conn_from_crses(rqstp, new);
        /* whoops: benny points out, status is ignored! (err, or bogus) */
        if (status) {
+               spin_lock(&client_lock);
                free_session(&new->se_ref);
+               spin_unlock(&client_lock);
                return NULL;
        }
        if (cses->flags & SESSION4_BACK_CHAN) {
@@ -1010,12 +1033,13 @@ static struct nfs4_client *alloc_client(struct xdr_netobj name)
 static inline void
 free_client(struct nfs4_client *clp)
 {
+       BUG_ON(!spin_is_locked(&client_lock));
        while (!list_empty(&clp->cl_sessions)) {
                struct nfsd4_session *ses;
                ses = list_entry(clp->cl_sessions.next, struct nfsd4_session,
                                se_perclnt);
                list_del(&ses->se_perclnt);
-               nfsd4_put_session(ses);
+               nfsd4_put_session_locked(ses);
        }
        if (clp->cl_cred.cr_group_info)
                put_group_info(clp->cl_cred.cr_group_info);
@@ -1184,7 +1208,9 @@ static struct nfs4_client *create_client(struct xdr_netobj name, char *recdir,
        if (princ) {
                clp->cl_principal = kstrdup(princ, GFP_KERNEL);
                if (clp->cl_principal == NULL) {
+                       spin_lock(&client_lock);
                        free_client(clp);
+                       spin_unlock(&client_lock);
                        return NULL;
                }
        }
@@ -1812,9 +1838,10 @@ nfsd4_destroy_session(struct svc_rqst *r,
        nfsd4_probe_callback_sync(ses->se_client);
        nfs4_unlock_state();
 
+       spin_lock(&client_lock);
        nfsd4_del_conns(ses);
-
-       nfsd4_put_session(ses);
+       nfsd4_put_session_locked(ses);
+       spin_unlock(&client_lock);
        status = nfs_ok;
 out:
        dprintk("%s returns %d\n", __func__, ntohl(status));

diff --git a/fs/nfsd/state.h b/fs/nfsd/state.h
index d8f52a0..1e2b582 100644 (file)
--- a/fs/nfsd/state.h
+++ b/fs/nfsd/state.h
@@ -198,18 +198,7 @@ struct nfsd4_session {
        struct nfsd4_slot       *se_slots[];    /* forward channel slots */
 };
 
-static inline void
-nfsd4_put_session(struct nfsd4_session *ses)
-{
-       extern void free_session(struct kref *kref);
-       kref_put(&ses->se_ref, free_session);
-}
-
-static inline void
-nfsd4_get_session(struct nfsd4_session *ses)
-{
-       kref_get(&ses->se_ref);
-}
+extern void nfsd4_put_session(struct nfsd4_session *ses);
 
 /* formatted contents of nfs4_sessionid */
 struct nfsd4_sessionid {