1 files changed, 205 insertions, 92 deletions

diff --git a/fs/nfs/client.c b/fs/nfs/client.c
index 0870d0d4efc0..bd3ca32879e7 100644
--- a/fs/nfs/client.c
+++ b/fs/nfs/client.c
@@ -56,6 +56,30 @@ static DEFINE_SPINLOCK(nfs_client_lock);
 static LIST_HEAD(nfs_client_list);
 static LIST_HEAD(nfs_volume_list);
 static DECLARE_WAIT_QUEUE_HEAD(nfs_client_active_wq);
+#ifdef CONFIG_NFS_V4
+static DEFINE_IDR(cb_ident_idr); /* Protected by nfs_client_lock */
+
+/*
+ * Get a unique NFSv4.0 callback identifier which will be used
+ * by the V4.0 callback service to lookup the nfs_client struct
+ */
+static int nfs_get_cb_ident_idr(struct nfs_client *clp, int minorversion)
+{
+        int ret = 0;
+
+        if (clp->rpc_ops->version != 4 || minorversion != 0)
+                return ret;
+retry:
+        if (!idr_pre_get(&cb_ident_idr, GFP_KERNEL))
+                return -ENOMEM;
+        spin_lock(&nfs_client_lock);
+        ret = idr_get_new(&cb_ident_idr, clp, &clp->cl_cb_ident);
+        spin_unlock(&nfs_client_lock);
+        if (ret == -EAGAIN)
+                goto retry;
+        return ret;
+}
+#endif /* CONFIG_NFS_V4 */
 
 /*
  * RPC cruft for NFS
@@ -144,7 +168,10 @@ static struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *cl_
         clp->cl_proto = cl_init->proto;
 
 #ifdef CONFIG_NFS_V4
-        INIT_LIST_HEAD(&clp->cl_delegations);
+        err = nfs_get_cb_ident_idr(clp, cl_init->minorversion);
+        if (err)
+                goto error_cleanup;
+
         spin_lock_init(&clp->cl_lock);
         INIT_DELAYED_WORK(&clp->cl_renewd, nfs4_renew_state);
         rpc_init_wait_queue(&clp->cl_rpcwaitq, "NFS client");
@@ -170,21 +197,17 @@ error_0:
 }
 
 #ifdef CONFIG_NFS_V4
-/*
- * Clears/puts all minor version specific parts from an nfs_client struct
- * reverting it to minorversion 0.
- */
-static void nfs4_clear_client_minor_version(struct nfs_client *clp)
-{
 #ifdef CONFIG_NFS_V4_1
-        if (nfs4_has_session(clp)) {
+static void nfs4_shutdown_session(struct nfs_client *clp)
+{
+        if (nfs4_has_session(clp))
                 nfs4_destroy_session(clp->cl_session);
-                clp->cl_session = NULL;
-        }
-
-        clp->cl_mvops = nfs_v4_minor_ops[0];
-#endif /* CONFIG_NFS_V4_1 */
 }
+#else /* CONFIG_NFS_V4_1 */
+static void nfs4_shutdown_session(struct nfs_client *clp)
+{
+}
+#endif /* CONFIG_NFS_V4_1 */
 
 /*
  * Destroy the NFS4 callback service
@@ -199,17 +222,49 @@ static void nfs4_shutdown_client(struct nfs_client *clp)
 {
         if (__test_and_clear_bit(NFS_CS_RENEWD, &clp->cl_res_state))
                 nfs4_kill_renewd(clp);
-        nfs4_clear_client_minor_version(clp);
+        nfs4_shutdown_session(clp);
         nfs4_destroy_callback(clp);
         if (__test_and_clear_bit(NFS_CS_IDMAP, &clp->cl_res_state))
                 nfs_idmap_delete(clp);
 
         rpc_destroy_wait_queue(&clp->cl_rpcwaitq);
 }
+
+/* idr_remove_all is not needed as all id's are removed by nfs_put_client */
+void nfs_cleanup_cb_ident_idr(void)
+{
+        idr_destroy(&cb_ident_idr);
+}
+
+/* nfs_client_lock held */
+static void nfs_cb_idr_remove_locked(struct nfs_client *clp)
+{
+        if (clp->cl_cb_ident)
+                idr_remove(&cb_ident_idr, clp->cl_cb_ident);
+}
+
+static void pnfs_init_server(struct nfs_server *server)
+{
+        rpc_init_wait_queue(&server->roc_rpcwaitq, "pNFS ROC");
+}
+
 #else
 static void nfs4_shutdown_client(struct nfs_client *clp)
 {
 }
+
+void nfs_cleanup_cb_ident_idr(void)
+{
+}
+
+static void nfs_cb_idr_remove_locked(struct nfs_client *clp)
+{
+}
+
+static void pnfs_init_server(struct nfs_server *server)
+{
+}
+
 #endif /* CONFIG_NFS_V4 */
 
 /*
@@ -248,6 +303,7 @@ void nfs_put_client(struct nfs_client *clp)
 
         if (atomic_dec_and_lock(&clp->cl_count, &nfs_client_lock)) {
                 list_del(&clp->cl_share_link);
+                nfs_cb_idr_remove_locked(clp);
                 spin_unlock(&nfs_client_lock);
 
                 BUG_ON(!list_empty(&clp->cl_superblocks));
@@ -363,70 +419,28 @@ static int nfs_sockaddr_cmp(const struct sockaddr *sa1,
         return 0;
 }
 
-/*
- * Find a client by IP address and protocol version
- * - returns NULL if no such client
- */
-struct nfs_client *nfs_find_client(const struct sockaddr *addr, u32 nfsversion)
+/* Common match routine for v4.0 and v4.1 callback services */
+bool
+nfs4_cb_match_client(const struct sockaddr *addr, struct nfs_client *clp,
+                     u32 minorversion)
 {
-        struct nfs_client *clp;
+        struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
 
-        spin_lock(&nfs_client_lock);
-        list_for_each_entry(clp, &nfs_client_list, cl_share_link) {
-                struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
+        /* Don't match clients that failed to initialise */
+        if (!(clp->cl_cons_state == NFS_CS_READY ||
+            clp->cl_cons_state == NFS_CS_SESSION_INITING))
+                return false;
 
-                /* Don't match clients that failed to initialise properly */
-                if (!(clp->cl_cons_state == NFS_CS_READY ||
-                      clp->cl_cons_state == NFS_CS_SESSION_INITING))
-                        continue;
+        /* Match the version and minorversion */
+        if (clp->rpc_ops->version != 4 ||
+            clp->cl_minorversion != minorversion)
+                return false;
 
-                /* Different NFS versions cannot share the same nfs_client */
-                if (clp->rpc_ops->version != nfsversion)
-                        continue;
+        /* Match only the IP address, not the port number */
+        if (!nfs_sockaddr_match_ipaddr(addr, clap))
+                return false;
 
-                /* Match only the IP address, not the port number */
-                if (!nfs_sockaddr_match_ipaddr(addr, clap))
-                        continue;
-
-                atomic_inc(&clp->cl_count);
-                spin_unlock(&nfs_client_lock);
-                return clp;
-        }
-        spin_unlock(&nfs_client_lock);
-        return NULL;
-}
-
-/*
- * Find a client by IP address and protocol version
- * - returns NULL if no such client
- */
-struct nfs_client *nfs_find_client_next(struct nfs_client *clp)
-{
-        struct sockaddr *sap = (struct sockaddr *)&clp->cl_addr;
-        u32 nfsvers = clp->rpc_ops->version;
-
-        spin_lock(&nfs_client_lock);
-        list_for_each_entry_continue(clp, &nfs_client_list, cl_share_link) {
-                struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
-
-                /* Don't match clients that failed to initialise properly */
-                if (clp->cl_cons_state != NFS_CS_READY)
-                        continue;
-
-                /* Different NFS versions cannot share the same nfs_client */
-                if (clp->rpc_ops->version != nfsvers)
-                        continue;
-
-                /* Match only the IP address, not the port number */
-                if (!nfs_sockaddr_match_ipaddr(sap, clap))
-                        continue;
-
-                atomic_inc(&clp->cl_count);
-                spin_unlock(&nfs_client_lock);
-                return clp;
-        }
-        spin_unlock(&nfs_client_lock);
-        return NULL;
+        return true;
 }
 
 /*
@@ -988,6 +1002,27 @@ static void nfs_server_copy_userdata(struct nfs_server *target, struct nfs_serve
         target->options = source->options;
 }
 
+static void nfs_server_insert_lists(struct nfs_server *server)
+{
+        struct nfs_client *clp = server->nfs_client;
+
+        spin_lock(&nfs_client_lock);
+        list_add_tail_rcu(&server->client_link, &clp->cl_superblocks);
+        list_add_tail(&server->master_link, &nfs_volume_list);
+        spin_unlock(&nfs_client_lock);
+
+}
+
+static void nfs_server_remove_lists(struct nfs_server *server)
+{
+        spin_lock(&nfs_client_lock);
+        list_del_rcu(&server->client_link);
+        list_del(&server->master_link);
+        spin_unlock(&nfs_client_lock);
+
+        synchronize_rcu();
+}
+
 /*
  * Allocate and initialise a server record
  */
@@ -1004,6 +1039,7 @@ static struct nfs_server *nfs_alloc_server(void)
         /* Zero out the NFS state stuff */
         INIT_LIST_HEAD(&server->client_link);
         INIT_LIST_HEAD(&server->master_link);
+        INIT_LIST_HEAD(&server->delegations);
 
         atomic_set(&server->active, 0);
 
@@ -1019,6 +1055,8 @@ static struct nfs_server *nfs_alloc_server(void)
                 return NULL;
         }
 
+        pnfs_init_server(server);
+
         return server;
 }
 
@@ -1029,11 +1067,8 @@ void nfs_free_server(struct nfs_server *server)
 {
         dprintk("--> nfs_free_server()\n");
 
+        nfs_server_remove_lists(server);
         unset_pnfs_layoutdriver(server);
-        spin_lock(&nfs_client_lock);
-        list_del(&server->client_link);
-        list_del(&server->master_link);
-        spin_unlock(&nfs_client_lock);
 
         if (server->destroy != NULL)
                 server->destroy(server);
@@ -1108,11 +1143,7 @@ struct nfs_server *nfs_create_server(const struct nfs_parsed_mount_data *data,
                 (unsigned long long) server->fsid.major,
                 (unsigned long long) server->fsid.minor);
 
-        spin_lock(&nfs_client_lock);
-        list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks);
-        list_add_tail(&server->master_link, &nfs_volume_list);
-        spin_unlock(&nfs_client_lock);
-
+        nfs_server_insert_lists(server);
         server->mount_time = jiffies;
         nfs_free_fattr(fattr);
         return server;
@@ -1125,6 +1156,96 @@ error:
 
 #ifdef CONFIG_NFS_V4
 /*
+ * NFSv4.0 callback thread helper
+ *
+ * Find a client by IP address, protocol version, and minorversion
+ *
+ * Called from the pg_authenticate method. The callback identifier
+ * is not used as it has not been decoded.
+ *
+ * Returns NULL if no such client
+ */
+struct nfs_client *
+nfs4_find_client_no_ident(const struct sockaddr *addr)
+{
+        struct nfs_client *clp;
+
+        spin_lock(&nfs_client_lock);
+        list_for_each_entry(clp, &nfs_client_list, cl_share_link) {
+                if (nfs4_cb_match_client(addr, clp, 0) == false)
+                        continue;
+                atomic_inc(&clp->cl_count);
+                spin_unlock(&nfs_client_lock);
+                return clp;
+        }
+        spin_unlock(&nfs_client_lock);
+        return NULL;
+}
+
+/*
+ * NFSv4.0 callback thread helper
+ *
+ * Find a client by callback identifier
+ */
+struct nfs_client *
+nfs4_find_client_ident(int cb_ident)
+{
+        struct nfs_client *clp;
+
+        spin_lock(&nfs_client_lock);
+        clp = idr_find(&cb_ident_idr, cb_ident);
+        if (clp)
+                atomic_inc(&clp->cl_count);
+        spin_unlock(&nfs_client_lock);
+        return clp;
+}
+
+#if defined(CONFIG_NFS_V4_1)
+/*
+ * NFSv4.1 callback thread helper
+ * For CB_COMPOUND calls, find a client by IP address, protocol version,
+ * minorversion, and sessionID
+ *
+ * Returns NULL if no such client
+ */
+struct nfs_client *
+nfs4_find_client_sessionid(const struct sockaddr *addr,
+                           struct nfs4_sessionid *sid)
+{
+        struct nfs_client *clp;
+
+        spin_lock(&nfs_client_lock);
+        list_for_each_entry(clp, &nfs_client_list, cl_share_link) {
+                if (nfs4_cb_match_client(addr, clp, 1) == false)
+                        continue;
+
+                if (!nfs4_has_session(clp))
+                        continue;
+
+                /* Match sessionid*/
+                if (memcmp(clp->cl_session->sess_id.data,
+                    sid->data, NFS4_MAX_SESSIONID_LEN) != 0)
+                        continue;
+
+                atomic_inc(&clp->cl_count);
+                spin_unlock(&nfs_client_lock);
+                return clp;
+        }
+        spin_unlock(&nfs_client_lock);
+        return NULL;
+}
+
+#else /* CONFIG_NFS_V4_1 */
+
+struct nfs_client *
+nfs4_find_client_sessionid(const struct sockaddr *addr,
+                           struct nfs4_sessionid *sid)
+{
+        return NULL;
+}
+#endif /* CONFIG_NFS_V4_1 */
+
+/*
  * Initialize the NFS4 callback service
  */
 static int nfs4_init_callback(struct nfs_client *clp)
@@ -1342,11 +1463,7 @@ static int nfs4_server_common_setup(struct nfs_server *server,
         if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
                 server->namelen = NFS4_MAXNAMLEN;
 
-        spin_lock(&nfs_client_lock);
-        list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks);
-        list_add_tail(&server->master_link, &nfs_volume_list);
-        spin_unlock(&nfs_client_lock);
-
+        nfs_server_insert_lists(server);
         server->mount_time = jiffies;
 out:
         nfs_free_fattr(fattr);
@@ -1551,11 +1668,7 @@ struct nfs_server *nfs_clone_server(struct nfs_server *source,
         if (error < 0)
                 goto out_free_server;
 
-        spin_lock(&nfs_client_lock);
-        list_add_tail(&server->client_link, &server->nfs_client->cl_superblocks);
-        list_add_tail(&server->master_link, &nfs_volume_list);
-        spin_unlock(&nfs_client_lock);
-
+        nfs_server_insert_lists(server);
         server->mount_time = jiffies;
 
         nfs_free_fattr(fattr_fsinfo);