NFSv41: Clean up slot table management

We no longer need to maintain a distinction between nfs41_sequence_done and
nfs41_sequence_free_slot.

This fixes a number of slot table leakages in the NFSv4.1 code.

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

5 files changed, 21 insertions, 82 deletions

diff --git a/fs/nfs/internal.h b/fs/nfs/internal.h
index 83a9284b83c7..b1a020c11724 100644
--- a/fs/nfs/internal.h
+++ b/fs/nfs/internal.h
@@ -197,8 +197,7 @@ extern const u32 nfs41_maxwrite_overhead;
 #endif
 
 /* nfs4proc.c */
-extern void nfs4_restart_rpc(struct rpc_task *, const struct nfs_client *,
-                             struct nfs4_sequence_res *);
+extern void nfs4_restart_rpc(struct rpc_task *, const struct nfs_client *);
 #ifdef CONFIG_NFS_V4
 extern struct rpc_procinfo nfs4_procedures[];
 #endif
@@ -275,20 +274,6 @@ extern int _nfs4_call_sync_session(struct nfs_server *server,
                                    struct nfs4_sequence_res *res,
                                    int cache_reply);
 
-#ifdef CONFIG_NFS_V4_1
-extern void nfs41_sequence_free_slot(const struct nfs_client *,
-                                     struct nfs4_sequence_res *res);
-#endif /* CONFIG_NFS_V4_1 */
-
-static inline void nfs4_sequence_free_slot(const struct nfs_client *clp,
-                                           struct nfs4_sequence_res *res)
-{
-#ifdef CONFIG_NFS_V4_1
-        if (nfs4_has_session(clp))
-                nfs41_sequence_free_slot(clp, res);
-#endif /* CONFIG_NFS_V4_1 */
-}
-
 /*
  * Determine the device name as a string
  */
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index be96d28baccf..c06a2bade59e 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -341,15 +341,11 @@ nfs4_free_slot(struct nfs4_slot_table *tbl, u8 free_slotid)
                 free_slotid, tbl->highest_used_slotid);
 }
 
-void nfs41_sequence_free_slot(const struct nfs_client *clp,
+static void nfs41_sequence_free_slot(const struct nfs_client *clp,
                               struct nfs4_sequence_res *res)
 {
         struct nfs4_slot_table *tbl;
 
-        if (!nfs4_has_session(clp)) {
-                dprintk("%s: No session\n", __func__);
-                return;
-        }
         tbl = &clp->cl_session->fc_slot_table;
         if (res->sr_slotid == NFS4_MAX_SLOT_TABLE) {
                 /* just wake up the next guy waiting since
@@ -407,7 +403,6 @@ static void nfs41_sequence_done(struct nfs_client *clp,
                 spin_unlock(&clp->cl_lock);
                 /* Check sequence flags */
                 nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
-                return;
         }
 out:
         /* The session may be reset by one of the error handlers. */
@@ -556,7 +551,6 @@ static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
         struct nfs41_call_sync_data *data = calldata;
 
         nfs41_sequence_done(data->clp, data->seq_res, task->tk_status);
-        nfs41_sequence_free_slot(data->clp, data->seq_res);
 }
 
 struct rpc_call_ops nfs41_call_sync_ops = {
@@ -632,12 +626,10 @@ static void nfs4_sequence_done(const struct nfs_server *server,
 #endif /* CONFIG_NFS_V4_1 */
 }
 
-void nfs4_restart_rpc(struct rpc_task *task, const struct nfs_client *clp,
-                      struct nfs4_sequence_res *res)
+void nfs4_restart_rpc(struct rpc_task *task, const struct nfs_client *clp)
 {
 #ifdef CONFIG_NFS_V4_1
         if (nfs4_has_session(clp)) {
-                nfs41_sequence_free_slot(clp, res);
                 rpc_restart_call_prepare(task);
                 return;
         }
@@ -645,15 +637,6 @@ void nfs4_restart_rpc(struct rpc_task *task, const struct nfs_client *clp,
         rpc_restart_call(task);
 }
 
-/* no restart, therefore free slot here */
-static void nfs4_sequence_done_free_slot(const struct nfs_server *server,
-                                         struct nfs4_sequence_res *res,
-                                         int rpc_status)
-{
-        nfs4_sequence_done(server, res, rpc_status);
-        nfs4_sequence_free_slot(server->nfs_client, res);
-}
-
 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 {
         struct nfs_inode *nfsi = NFS_I(dir);
@@ -1350,8 +1333,8 @@ static void nfs4_open_done(struct rpc_task *task, void *calldata)
 
         data->rpc_status = task->tk_status;
 
-        nfs4_sequence_done_free_slot(data->o_arg.server, &data->o_res.seq_res,
-                                     task->tk_status);
+        nfs4_sequence_done(data->o_arg.server, &data->o_res.seq_res,
+                        task->tk_status);
 
         if (RPC_ASSASSINATED(task))
                 return;
@@ -1757,12 +1740,10 @@ static void nfs4_close_done(struct rpc_task *task, void *data)
                                 break;
                 default:
                         if (nfs4_async_handle_error(task, server, state) == -EAGAIN) {
-                                nfs4_restart_rpc(task, server->nfs_client,
-                                                 &calldata->res.seq_res);
+                                nfs4_restart_rpc(task, server->nfs_client);
                                 return;
                         }
         }
-        nfs4_sequence_free_slot(server->nfs_client, &calldata->res.seq_res);
         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
 }
 
@@ -2553,7 +2534,6 @@ static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
         nfs4_sequence_done(res->server, &res->seq_res, task->tk_status);
         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
                 return 0;
-        nfs4_sequence_free_slot(res->server->nfs_client, &res->seq_res);
         update_changeattr(dir, &res->cinfo);
         nfs_post_op_update_inode(dir, &res->dir_attr);
         return 1;
@@ -2992,20 +2972,16 @@ static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
 
         dprintk("--> %s\n", __func__);
 
-        /* nfs4_sequence_free_slot called in the read rpc_call_done */
         nfs4_sequence_done(server, &data->res.seq_res, task->tk_status);
 
         if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
-                nfs4_restart_rpc(task, server->nfs_client, &data->res.seq_res);
+                nfs4_restart_rpc(task, server->nfs_client);
                 return -EAGAIN;
         }
 
         nfs_invalidate_atime(data->inode);
         if (task->tk_status > 0)
                 renew_lease(server, data->timestamp);
-        else if (task->tk_status < 0)
-                nfs4_sequence_free_slot(server->nfs_client, &data->res.seq_res);
-
         return 0;
 }
 
@@ -3019,13 +2995,11 @@ static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
 {
         struct inode *inode = data->inode;
         
-        /* slot is freed in nfs_writeback_done */
         nfs4_sequence_done(NFS_SERVER(inode), &data->res.seq_res,
                            task->tk_status);
 
         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
-                nfs4_restart_rpc(task, NFS_SERVER(inode)->nfs_client,
-                                 &data->res.seq_res);
+                nfs4_restart_rpc(task, NFS_SERVER(inode)->nfs_client);
                 return -EAGAIN;
         }
         if (task->tk_status >= 0) {
@@ -3053,12 +3027,9 @@ static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
         nfs4_sequence_done(NFS_SERVER(inode), &data->res.seq_res,
                            task->tk_status);
         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
-                nfs4_restart_rpc(task, NFS_SERVER(inode)->nfs_client,
-                                 &data->res.seq_res);
+                nfs4_restart_rpc(task, NFS_SERVER(inode)->nfs_client);
                 return -EAGAIN;
         }
-        nfs4_sequence_free_slot(NFS_SERVER(inode)->nfs_client,
-                                &data->res.seq_res);
         nfs_refresh_inode(inode, data->res.fattr);
         return 0;
 }
@@ -3509,8 +3480,8 @@ static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
 {
         struct nfs4_delegreturndata *data = calldata;
 
-        nfs4_sequence_done_free_slot(data->res.server, &data->res.seq_res,
-                                     task->tk_status);
+        nfs4_sequence_done(data->res.server, &data->res.seq_res,
+                        task->tk_status);
 
         data->rpc_status = task->tk_status;
         if (data->rpc_status == 0)
@@ -3768,11 +3739,8 @@ static void nfs4_locku_done(struct rpc_task *task, void *data)
                 default:
                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
                                 nfs4_restart_rpc(task,
-                                                 calldata->server->nfs_client,
-                                                 &calldata->res.seq_res);
+                                                 calldata->server->nfs_client);
         }
-        nfs4_sequence_free_slot(calldata->server->nfs_client,
-                                &calldata->res.seq_res);
 }
 
 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
@@ -3954,8 +3922,8 @@ static void nfs4_lock_done(struct rpc_task *task, void *calldata)
 
         dprintk("%s: begin!\n", __func__);
 
-        nfs4_sequence_done_free_slot(data->server, &data->res.seq_res,
-                                     task->tk_status);
+        nfs4_sequence_done(data->server, &data->res.seq_res,
+                        task->tk_status);
 
         data->rpc_status = task->tk_status;
         if (RPC_ASSASSINATED(task))
@@ -4425,10 +4393,9 @@ static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
                 task->tk_status = 0;
-                rpc_restart_call(task);
+                nfs4_restart_rpc(task, data->clp);
                 return;
         }
-        nfs41_sequence_free_slot(data->clp, &data->res->lr_seq_res);
         dprintk("<-- %s\n", __func__);
 }
 
@@ -4900,11 +4867,10 @@ void nfs41_sequence_call_done(struct rpc_task *task, void *data)
 
                 if (_nfs4_async_handle_error(task, NULL, clp, NULL)
                                                                 == -EAGAIN) {
-                        nfs4_restart_rpc(task, clp, task->tk_msg.rpc_resp);
+                        nfs4_restart_rpc(task, clp);
                         return;
                 }
         }
-        nfs41_sequence_free_slot(clp, task->tk_msg.rpc_resp);
         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
 
         kfree(task->tk_msg.rpc_argp);
@@ -5008,7 +4974,6 @@ static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
                         return;
                 }
         }
-        nfs41_sequence_free_slot(clp, res);
 
         dprintk("<-- %s\n", __func__);
 }
diff --git a/fs/nfs/read.c b/fs/nfs/read.c
index 3e04fb9ea644..d319bfbe5137 100644
--- a/fs/nfs/read.c
+++ b/fs/nfs/read.c
@@ -356,26 +356,19 @@ static void nfs_readpage_retry(struct rpc_task *task, struct nfs_read_data *data
         struct nfs_readres *resp = &data->res;
 
         if (resp->eof || resp->count == argp->count)
-                goto out;
+                return;
 
         /* This is a short read! */
         nfs_inc_stats(data->inode, NFSIOS_SHORTREAD);
         /* Has the server at least made some progress? */
         if (resp->count == 0)
-                goto out;
+                return;
 
         /* Yes, so retry the read at the end of the data */
         argp->offset += resp->count;
         argp->pgbase += resp->count;
         argp->count -= resp->count;
-        nfs4_restart_rpc(task, NFS_SERVER(data->inode)->nfs_client,
-                         &data->res.seq_res);
-        return;
-out:
-        nfs4_sequence_free_slot(NFS_SERVER(data->inode)->nfs_client,
-                                &data->res.seq_res);
-        return;
-
+        nfs4_restart_rpc(task, NFS_SERVER(data->inode)->nfs_client);
 }
 
 /*
diff --git a/fs/nfs/unlink.c b/fs/nfs/unlink.c
index 52f7bdb12c83..1064c91ae810 100644
--- a/fs/nfs/unlink.c
+++ b/fs/nfs/unlink.c
@@ -81,11 +81,9 @@ static void nfs_async_unlink_done(struct rpc_task *task, void *calldata)
 {
         struct nfs_unlinkdata *data = calldata;
         struct inode *dir = data->dir;
-        struct nfs_removeres *res = task->tk_msg.rpc_resp;
 
         if (!NFS_PROTO(dir)->unlink_done(task, dir))
-                nfs4_restart_rpc(task, NFS_SERVER(dir)->nfs_client,
-                                 &res->seq_res);
+                nfs4_restart_rpc(task, NFS_SERVER(dir)->nfs_client);
 }
 
 /**
diff --git a/fs/nfs/write.c b/fs/nfs/write.c
index 556668ff0224..d546c607de08 100644
--- a/fs/nfs/write.c
+++ b/fs/nfs/write.c
@@ -1216,8 +1216,7 @@ int nfs_writeback_done(struct rpc_task *task, struct nfs_write_data *data)
                                  */
                                 argp->stable = NFS_FILE_SYNC;
                         }
-                        nfs4_restart_rpc(task, server->nfs_client,
-                                         &data->res.seq_res);
+                        nfs4_restart_rpc(task, server->nfs_client);
                         return -EAGAIN;
                 }
                 if (time_before(complain, jiffies)) {
@@ -1229,7 +1228,6 @@ int nfs_writeback_done(struct rpc_task *task, struct nfs_write_data *data)
                 /* Can't do anything about it except throw an error. */
                 task->tk_status = -EIO;
         }
-        nfs4_sequence_free_slot(server->nfs_client, &data->res.seq_res);
         return 0;
 }