nfsd: make unconf_id_hashtbl allocated per net

This hash holds nfs4_clients info, which are network namespace aware.
So let's make it allocated per network namespace.

Note: this hash can be allocated in per-net operations. But it looks
better to allocate it on nfsd state start and thus don't waste resources
if server is not running.

Signed-off-by: Stanislav Kinsbursky <skinsbursky@parallels.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>

2 files changed, 16 insertions, 10 deletions

diff --git a/fs/nfsd/netns.h b/fs/nfsd/netns.h
index afd91163846..1ff781f9c3d 100644
--- a/fs/nfsd/netns.h
+++ b/fs/nfsd/netns.h
@@ -55,6 +55,7 @@ struct nfsd_net {
         int reclaim_str_hashtbl_size;
         struct list_head *conf_id_hashtbl;
         struct rb_root conf_name_tree;
+        struct list_head *unconf_id_hashtbl;
 };
 
 extern int nfsd_net_id;
diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index d40e57b9051..f33bbfbdc24 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -415,7 +415,6 @@ static unsigned int clientstr_hashval(const char *name)
  *
  * All of the above fields are protected by the client_mutex.
  */
-static struct list_head unconf_id_hashtbl[CLIENT_HASH_SIZE];
 static struct rb_root unconf_name_tree;
 static struct list_head client_lru;
 static struct list_head close_lru;
@@ -1369,11 +1368,12 @@ static void
 add_to_unconfirmed(struct nfs4_client *clp)
 {
         unsigned int idhashval;
+        struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
 
         clear_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags);
         add_clp_to_name_tree(clp, &unconf_name_tree);
         idhashval = clientid_hashval(clp->cl_clientid.cl_id);
-        list_add(&clp->cl_idhash, &unconf_id_hashtbl[idhashval]);
+        list_add(&clp->cl_idhash, &nn->unconf_id_hashtbl[idhashval]);
         renew_client(clp);
 }
 
@@ -1409,12 +1409,12 @@ find_confirmed_client(clientid_t *clid, bool sessions, struct nfsd_net *nn)
 }
 
 static struct nfs4_client *
-find_unconfirmed_client(clientid_t *clid, bool sessions)
+find_unconfirmed_client(clientid_t *clid, bool sessions, struct nfsd_net *nn)
 {
         struct nfs4_client *clp;
         unsigned int idhashval = clientid_hashval(clid->cl_id);
 
-        list_for_each_entry(clp, &unconf_id_hashtbl[idhashval], cl_idhash) {
+        list_for_each_entry(clp, &nn->unconf_id_hashtbl[idhashval], cl_idhash) {
                 if (same_clid(&clp->cl_clientid, clid)) {
                         if ((bool)clp->cl_minorversion != sessions)
                                 return NULL;
@@ -1799,7 +1799,7 @@ nfsd4_create_session(struct svc_rqst *rqstp,
                 goto out_free_session;
 
         nfs4_lock_state();
-        unconf = find_unconfirmed_client(&cr_ses->clientid, true);
+        unconf = find_unconfirmed_client(&cr_ses->clientid, true, nn);
         conf = find_confirmed_client(&cr_ses->clientid, true, nn);
 
         if (conf) {
@@ -2143,7 +2143,7 @@ nfsd4_destroy_clientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *csta
         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
 
         nfs4_lock_state();
-        unconf = find_unconfirmed_client(&dc->clientid, true);
+        unconf = find_unconfirmed_client(&dc->clientid, true, nn);
         conf = find_confirmed_client(&dc->clientid, true, nn);
 
         if (conf) {
@@ -2280,7 +2280,7 @@ nfsd4_setclientid_confirm(struct svc_rqst *rqstp,
         nfs4_lock_state();
 
         conf = find_confirmed_client(clid, false, nn);
-        unconf = find_unconfirmed_client(clid, false);
+        unconf = find_unconfirmed_client(clid, false, nn);
         /*
          * We try hard to give out unique clientid's, so if we get an
          * attempt to confirm the same clientid with a different cred,
@@ -4720,9 +4720,6 @@ nfs4_state_init(void)
 {
         int i;
 
-        for (i = 0; i < CLIENT_HASH_SIZE; i++) {
-                INIT_LIST_HEAD(&unconf_id_hashtbl[i]);
-        }
         unconf_name_tree = RB_ROOT;
         for (i = 0; i < SESSION_HASH_SIZE; i++)
                 INIT_LIST_HEAD(&sessionid_hashtbl[i]);
@@ -4769,14 +4766,21 @@ static int nfs4_state_start_net(struct net *net)
                         CLIENT_HASH_SIZE, GFP_KERNEL);
         if (!nn->conf_id_hashtbl)
                 goto err;
+        nn->unconf_id_hashtbl = kmalloc(sizeof(struct list_head) *
+                        CLIENT_HASH_SIZE, GFP_KERNEL);
+        if (!nn->unconf_id_hashtbl)
+                goto err_unconf_id;
 
         for (i = 0; i < CLIENT_HASH_SIZE; i++) {
                 INIT_LIST_HEAD(&nn->conf_id_hashtbl[i]);
+                INIT_LIST_HEAD(&nn->unconf_id_hashtbl[i]);
         }
         nn->conf_name_tree = RB_ROOT;
 
         return 0;
 
+err_unconf_id:
+        kfree(nn->conf_id_hashtbl);
 err:
         return -ENOMEM;
 }
@@ -4794,6 +4798,7 @@ __nfs4_state_shutdown_net(struct net *net)
                         destroy_client(clp);
                 }
         }
+        kfree(nn->unconf_id_hashtbl);
         kfree(nn->conf_id_hashtbl);
 }