SUNRPC: Support for RPC child tasks no longer needed

The previous patches removed the last user of RPC child tasks, so we can
remove support for child tasks from net/sunrpc/sched.c now.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

diff --git a/include/linux/sunrpc/sched.h b/include/linux/sunrpc/sched.h
index 82a91bb..f399c13 100644 (file)
--- a/include/linux/sunrpc/sched.h
+++ b/include/linux/sunrpc/sched.h
@@ -127,7 +127,6 @@ struct rpc_call_ops {
  */
 #define RPC_TASK_ASYNC         0x0001          /* is an async task */
 #define RPC_TASK_SWAPPER       0x0002          /* is swapping in/out */
-#define RPC_TASK_CHILD         0x0008          /* is child of other task */
 #define RPC_CALL_MAJORSEEN     0x0020          /* major timeout seen */
 #define RPC_TASK_ROOTCREDS     0x0040          /* force root creds */
 #define RPC_TASK_DYNAMIC       0x0080          /* task was kmalloc'ed */
@@ -136,7 +135,6 @@ struct rpc_call_ops {
 #define RPC_TASK_NOINTR                0x0400          /* uninterruptible task */
 
 #define RPC_IS_ASYNC(t)                ((t)->tk_flags & RPC_TASK_ASYNC)
-#define RPC_IS_CHILD(t)                ((t)->tk_flags & RPC_TASK_CHILD)
 #define RPC_IS_SWAPPER(t)      ((t)->tk_flags & RPC_TASK_SWAPPER)
 #define RPC_DO_ROOTOVERRIDE(t) ((t)->tk_flags & RPC_TASK_ROOTCREDS)
 #define RPC_ASSASSINATED(t)    ((t)->tk_flags & RPC_TASK_KILLED)
@@ -253,7 +251,6 @@ struct rpc_task *rpc_new_task(struct rpc_clnt *, int flags,
                                const struct rpc_call_ops *ops, void *data);
 struct rpc_task *rpc_run_task(struct rpc_clnt *clnt, int flags,
                                const struct rpc_call_ops *ops, void *data);
-struct rpc_task *rpc_new_child(struct rpc_clnt *, struct rpc_task *parent);
 void           rpc_init_task(struct rpc_task *task, struct rpc_clnt *clnt,
                                int flags, const struct rpc_call_ops *ops,
                                void *data);
@@ -261,8 +258,6 @@ void                rpc_release_task(struct rpc_task *);
 void           rpc_exit_task(struct rpc_task *);
 void           rpc_killall_tasks(struct rpc_clnt *);
 int            rpc_execute(struct rpc_task *);
-void           rpc_run_child(struct rpc_task *parent, struct rpc_task *child,
-                                       rpc_action action);
 void           rpc_init_priority_wait_queue(struct rpc_wait_queue *, const char *);
 void           rpc_init_wait_queue(struct rpc_wait_queue *, const char *);
 void           rpc_sleep_on(struct rpc_wait_queue *, struct rpc_task *,

diff --git a/net/sunrpc/sched.c b/net/sunrpc/sched.c
index 5c3eee7..015ffe4 100644 (file)
--- a/net/sunrpc/sched.c
+++ b/net/sunrpc/sched.c
@@ -44,12 +44,6 @@ static void                  __rpc_default_timer(struct rpc_task *task);
 static void                    rpciod_killall(void);
 static void                    rpc_async_schedule(void *);
 
-/*
- * RPC tasks that create another task (e.g. for contacting the portmapper)
- * will wait on this queue for their child's completion
- */
-static RPC_WAITQ(childq, "childq");
-
 /*
  * RPC tasks sit here while waiting for conditions to improve.
  */
@@ -323,16 +317,6 @@ static void rpc_make_runnable(struct rpc_task *task)
                wake_up_bit(&task->tk_runstate, RPC_TASK_QUEUED);
 }
 
-/*
- * Place a newly initialized task on the workqueue.
- */
-static inline void
-rpc_schedule_run(struct rpc_task *task)
-{
-       rpc_set_active(task);
-       rpc_make_runnable(task);
-}
-
 /*
  * Prepare for sleeping on a wait queue.
  * By always appending tasks to the list we ensure FIFO behavior.
@@ -933,72 +917,6 @@ struct rpc_task *rpc_run_task(struct rpc_clnt *clnt, int flags,
 }
 EXPORT_SYMBOL(rpc_run_task);
 
-/**
- * rpc_find_parent - find the parent of a child task.
- * @child: child task
- * @parent: parent task
- *
- * Checks that the parent task is still sleeping on the
- * queue 'childq'. If so returns a pointer to the parent.
- * Upon failure returns NULL.
- *
- * Caller must hold childq.lock
- */
-static inline struct rpc_task *rpc_find_parent(struct rpc_task *child, struct rpc_task *parent)
-{
-       struct rpc_task *task;
-       struct list_head *le;
-
-       task_for_each(task, le, &childq.tasks[0])
-               if (task == parent)
-                       return parent;
-
-       return NULL;
-}
-
-static void rpc_child_exit(struct rpc_task *child, void *calldata)
-{
-       struct rpc_task *parent;
-
-       spin_lock_bh(&childq.lock);
-       if ((parent = rpc_find_parent(child, calldata)) != NULL) {
-               parent->tk_status = child->tk_status;
-               __rpc_wake_up_task(parent);
-       }
-       spin_unlock_bh(&childq.lock);
-}
-
-static const struct rpc_call_ops rpc_child_ops = {
-       .rpc_call_done = rpc_child_exit,
-};
-
-/*
- * Note: rpc_new_task releases the client after a failure.
- */
-struct rpc_task *
-rpc_new_child(struct rpc_clnt *clnt, struct rpc_task *parent)
-{
-       struct rpc_task *task;
-
-       task = rpc_new_task(clnt, RPC_TASK_ASYNC | RPC_TASK_CHILD, &rpc_child_ops, parent);
-       if (!task)
-               goto fail;
-       return task;
-
-fail:
-       parent->tk_status = -ENOMEM;
-       return NULL;
-}
-
-void rpc_run_child(struct rpc_task *task, struct rpc_task *child, rpc_action func)
-{
-       spin_lock_bh(&childq.lock);
-       /* N.B. Is it possible for the child to have already finished? */
-       __rpc_sleep_on(&childq, task, func, NULL);
-       rpc_schedule_run(child);
-       spin_unlock_bh(&childq.lock);
-}
-
 /*
  * Kill all tasks for the given client.
  * XXX: kill their descendants as well?