static mempool_t *rpc_buffer_mempool __read_mostly;
static void __rpc_default_timer(struct rpc_task *task);
-static void rpciod_killall(void);
static void rpc_async_schedule(struct work_struct *);
static void rpc_release_task(struct rpc_task *task);
*/
static RPC_WAITQ(delay_queue, "delayq");
-/*
- * All RPC clients are linked into this list
- */
-static LIST_HEAD(all_clients);
-static DECLARE_WAIT_QUEUE_HEAD(client_kill_wait);
-
/*
* rpciod-related stuff
*/
static DEFINE_MUTEX(rpciod_mutex);
-static unsigned int rpciod_users;
+static atomic_t rpciod_users = ATOMIC_INIT(0);
struct workqueue_struct *rpciod_workqueue;
-/*
- * Spinlock for other critical sections of code.
- */
-static DEFINE_SPINLOCK(rpc_sched_lock);
-
/*
* Disable the timer for a given RPC task. Should be called with
* queue->lock and bh_disabled in order to avoid races within
}
/*
- * Create a new task for the specified client. We have to
- * clean up after an allocation failure, as the client may
- * have specified "oneshot".
+ * Create a new task for the specified client.
*/
struct rpc_task *rpc_new_task(struct rpc_clnt *clnt, int flags, const struct rpc_call_ops *tk_ops, void *calldata)
{
task = rpc_alloc_task();
if (!task)
- goto cleanup;
+ goto out;
rpc_init_task(task, clnt, flags, tk_ops, calldata);
task->tk_flags |= RPC_TASK_DYNAMIC;
out:
return task;
-
-cleanup:
- /* Check whether to release the client */
- if (clnt) {
- kref_get(&clnt->cl_kref); /* pretend we were used ... */
- rpc_release_client(clnt);
- }
- goto out;
}
rpc_put_task(task);
}
-/**
- * rpc_run_task - Allocate a new RPC task, then run rpc_execute against it
- * @clnt: pointer to RPC client
- * @flags: RPC flags
- * @ops: RPC call ops
- * @data: user call data
- */
-struct rpc_task *rpc_run_task(struct rpc_clnt *clnt, int flags,
- const struct rpc_call_ops *ops,
- void *data)
-{
- struct rpc_task *task;
- task = rpc_new_task(clnt, flags, ops, data);
- if (task == NULL) {
- rpc_release_calldata(ops, data);
- return ERR_PTR(-ENOMEM);
- }
- atomic_inc(&task->tk_count);
- rpc_execute(task);
- return task;
-}
-EXPORT_SYMBOL(rpc_run_task);
-
/*
* Kill all tasks for the given client.
* XXX: kill their descendants as well?
spin_unlock(&clnt->cl_lock);
}
-static void rpciod_killall(void)
-{
- struct rpc_clnt *clnt;
- unsigned long flags;
-
- for(;;) {
- clear_thread_flag(TIF_SIGPENDING);
-
- spin_lock(&rpc_sched_lock);
- list_for_each_entry(clnt, &all_clients, cl_clients)
- rpc_killall_tasks(clnt);
- spin_unlock(&rpc_sched_lock);
- flush_workqueue(rpciod_workqueue);
- if (!list_empty(&all_clients))
- break;
- dprintk("RPC: rpciod_killall: waiting for tasks "
- "to exit\n");
- wait_event_timeout(client_kill_wait,
- list_empty(&all_clients), 1*HZ);
- }
-
- spin_lock_irqsave(¤t->sighand->siglock, flags);
- recalc_sigpending();
- spin_unlock_irqrestore(¤t->sighand->siglock, flags);
-}
-
-void rpc_register_client(struct rpc_clnt *clnt)
-{
- spin_lock(&rpc_sched_lock);
- list_add(&clnt->cl_clients, &all_clients);
- spin_unlock(&rpc_sched_lock);
-}
-
-void rpc_unregister_client(struct rpc_clnt *clnt)
-{
- spin_lock(&rpc_sched_lock);
- list_del(&clnt->cl_clients);
- if (list_empty(&all_clients))
- wake_up(&client_kill_wait);
- spin_unlock(&rpc_sched_lock);
-}
-
/*
* Start up the rpciod process if it's not already running.
*/
struct workqueue_struct *wq;
int error = 0;
+ if (atomic_inc_not_zero(&rpciod_users))
+ return 0;
+
mutex_lock(&rpciod_mutex);
- dprintk("RPC: rpciod_up: users %u\n", rpciod_users);
- rpciod_users++;
- if (rpciod_workqueue)
- goto out;
- /*
- * If there's no pid, we should be the first user.
- */
- if (rpciod_users > 1)
- printk(KERN_WARNING "rpciod_up: no workqueue, %u users??\n", rpciod_users);
+
+ /* Guard against races with rpciod_down() */
+ if (rpciod_workqueue != NULL)
+ goto out_ok;
/*
* Create the rpciod thread and wait for it to start.
*/
+ dprintk("RPC: creating workqueue rpciod\n");
error = -ENOMEM;
wq = create_workqueue("rpciod");
- if (wq == NULL) {
- printk(KERN_WARNING "rpciod_up: create workqueue failed, error=%d\n", error);
- rpciod_users--;
+ if (wq == NULL)
goto out;
- }
+
rpciod_workqueue = wq;
error = 0;
+out_ok:
+ atomic_inc(&rpciod_users);
out:
mutex_unlock(&rpciod_mutex);
return error;
void
rpciod_down(void)
{
+ if (!atomic_dec_and_test(&rpciod_users))
+ return;
+
mutex_lock(&rpciod_mutex);
- dprintk("RPC: rpciod_down sema %u\n", rpciod_users);
- if (rpciod_users) {
- if (--rpciod_users)
- goto out;
- } else
- printk(KERN_WARNING "rpciod_down: no users??\n");
+ dprintk("RPC: destroying workqueue rpciod\n");
- if (!rpciod_workqueue) {
- dprintk("RPC: rpciod_down: Nothing to do!\n");
- goto out;
+ if (atomic_read(&rpciod_users) == 0 && rpciod_workqueue != NULL) {
+ destroy_workqueue(rpciod_workqueue);
+ rpciod_workqueue = NULL;
}
- rpciod_killall();
-
- destroy_workqueue(rpciod_workqueue);
- rpciod_workqueue = NULL;
- out:
mutex_unlock(&rpciod_mutex);
}
-#ifdef RPC_DEBUG
-void rpc_show_tasks(void)
-{
- struct rpc_clnt *clnt;
- struct rpc_task *t;
-
- spin_lock(&rpc_sched_lock);
- if (list_empty(&all_clients))
- goto out;
- printk("-pid- proc flgs status -client- -prog- --rqstp- -timeout "
- "-rpcwait -action- ---ops--\n");
- list_for_each_entry(clnt, &all_clients, cl_clients) {
- if (list_empty(&clnt->cl_tasks))
- continue;
- spin_lock(&clnt->cl_lock);
- list_for_each_entry(t, &clnt->cl_tasks, tk_task) {
- const char *rpc_waitq = "none";
-
- if (RPC_IS_QUEUED(t))
- rpc_waitq = rpc_qname(t->u.tk_wait.rpc_waitq);
-
- printk("%5u %04d %04x %6d %8p %6d %8p %8ld %8s %8p %8p\n",
- t->tk_pid,
- (t->tk_msg.rpc_proc ? t->tk_msg.rpc_proc->p_proc : -1),
- t->tk_flags, t->tk_status,
- t->tk_client,
- (t->tk_client ? t->tk_client->cl_prog : 0),
- t->tk_rqstp, t->tk_timeout,
- rpc_waitq,
- t->tk_action, t->tk_ops);
- }
- spin_unlock(&clnt->cl_lock);
- }
-out:
- spin_unlock(&rpc_sched_lock);
-}
-#endif
-
void
rpc_destroy_mempool(void)
{
rpc_task_slabp = kmem_cache_create("rpc_tasks",
sizeof(struct rpc_task),
0, SLAB_HWCACHE_ALIGN,
- NULL, NULL);
+ NULL);
if (!rpc_task_slabp)
goto err_nomem;
rpc_buffer_slabp = kmem_cache_create("rpc_buffers",
RPC_BUFFER_MAXSIZE,
0, SLAB_HWCACHE_ALIGN,
- NULL, NULL);
+ NULL);
if (!rpc_buffer_slabp)
goto err_nomem;
rpc_task_mempool = mempool_create_slab_pool(RPC_TASK_POOLSIZE,
projects / karo-tx-linux.git / blobdiff