diff options
Diffstat (limited to 'net/sunrpc/sched.c')
| -rw-r--r-- | net/sunrpc/sched.c | 78 |
1 files changed, 59 insertions, 19 deletions
diff --git a/net/sunrpc/sched.c b/net/sunrpc/sched.c index 2d74a167202..82d158dad16 100644 --- a/net/sunrpc/sched.c +++ b/net/sunrpc/sched.c @@ -264,6 +264,35 @@ void rpc_init_wait_queue(struct rpc_wait_queue *queue, const char *qname) } EXPORT_SYMBOL(rpc_init_wait_queue); +static int rpc_wait_bit_interruptible(void *word) +{ + if (signal_pending(current)) + return -ERESTARTSYS; + schedule(); + return 0; +} + +/* + * Mark an RPC call as having completed by clearing the 'active' bit + */ +static inline void rpc_mark_complete_task(struct rpc_task *task) +{ + rpc_clear_active(task); + wake_up_bit(&task->tk_runstate, RPC_TASK_ACTIVE); +} + +/* + * Allow callers to wait for completion of an RPC call + */ +int __rpc_wait_for_completion_task(struct rpc_task *task, int (*action)(void *)) +{ + if (action == NULL) + action = rpc_wait_bit_interruptible; + return wait_on_bit(&task->tk_runstate, RPC_TASK_ACTIVE, + action, TASK_INTERRUPTIBLE); +} +EXPORT_SYMBOL(__rpc_wait_for_completion_task); + /* * Make an RPC task runnable. * @@ -299,10 +328,7 @@ static void rpc_make_runnable(struct rpc_task *task) static inline void rpc_schedule_run(struct rpc_task *task) { - /* Don't run a child twice! */ - if (RPC_IS_ACTIVATED(task)) - return; - task->tk_active = 1; + rpc_set_active(task); rpc_make_runnable(task); } @@ -324,8 +350,7 @@ static void __rpc_sleep_on(struct rpc_wait_queue *q, struct rpc_task *task, } /* Mark the task as being activated if so needed */ - if (!RPC_IS_ACTIVATED(task)) - task->tk_active = 1; + rpc_set_active(task); __rpc_add_wait_queue(q, task); @@ -580,14 +605,6 @@ void rpc_exit_task(struct rpc_task *task) } EXPORT_SYMBOL(rpc_exit_task); -static int rpc_wait_bit_interruptible(void *word) -{ - if (signal_pending(current)) - return -ERESTARTSYS; - schedule(); - return 0; -} - /* * This is the RPC `scheduler' (or rather, the finite state machine). */ @@ -680,6 +697,8 @@ static int __rpc_execute(struct rpc_task *task) dprintk("RPC: %4d exit() = %d\n", task->tk_pid, task->tk_status); status = task->tk_status; + /* Wake up anyone who is waiting for task completion */ + rpc_mark_complete_task(task); /* Release all resources associated with the task */ rpc_release_task(task); return status; @@ -697,9 +716,7 @@ static int __rpc_execute(struct rpc_task *task) int rpc_execute(struct rpc_task *task) { - BUG_ON(task->tk_active); - - task->tk_active = 1; + rpc_set_active(task); rpc_set_running(task); return __rpc_execute(task); } @@ -761,6 +778,7 @@ void rpc_init_task(struct rpc_task *task, struct rpc_clnt *clnt, int flags, cons init_timer(&task->tk_timer); task->tk_timer.data = (unsigned long) task; task->tk_timer.function = (void (*)(unsigned long)) rpc_run_timer; + atomic_set(&task->tk_count, 1); task->tk_client = clnt; task->tk_flags = flags; task->tk_ops = tk_ops; @@ -848,11 +866,13 @@ void rpc_release_task(struct rpc_task *task) { const struct rpc_call_ops *tk_ops = task->tk_ops; void *calldata = task->tk_calldata; - dprintk("RPC: %4d release task\n", task->tk_pid); #ifdef RPC_DEBUG BUG_ON(task->tk_magic != RPC_TASK_MAGIC_ID); #endif + if (!atomic_dec_and_test(&task->tk_count)) + return; + dprintk("RPC: %4d release task\n", task->tk_pid); /* Remove from global task list */ spin_lock(&rpc_sched_lock); @@ -860,7 +880,6 @@ void rpc_release_task(struct rpc_task *task) spin_unlock(&rpc_sched_lock); BUG_ON (RPC_IS_QUEUED(task)); - task->tk_active = 0; /* Synchronously delete any running timer */ rpc_delete_timer(task); @@ -886,6 +905,27 @@ void rpc_release_task(struct rpc_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) + return ERR_PTR(-ENOMEM); + atomic_inc(&task->tk_count); + rpc_execute(task); + return task; +} +EXPORT_SYMBOL(rpc_run_task); + +/** * rpc_find_parent - find the parent of a child task. * @child: child task * |