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SUNRPC: Add a helper to wake up a sleeping rpc_task and set its status 

Add a helper that will wake up a task that is sleeping on a specific
queue, and will set the value of task->tk_status. This is mainly
intended for use by the transport layer to notify the task of an
error condition.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
This commit is contained in:
Trond Myklebust 2018-08-29 09:22:28 -04:00
parent cf9946cd61
commit 359c48c04a
2 changed files with 58 additions and 10 deletions
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3
include/linux/sunrpc/sched.h
View File

@ -235,6 +235,9 @@ void rpc_wake_up_queued_task_on_wq(struct workqueue_struct *wq,
struct rpc_task *task);
void rpc_wake_up_queued_task(struct rpc_wait_queue *,
struct rpc_task *);
void rpc_wake_up_queued_task_set_status(struct rpc_wait_queue *,
struct rpc_task *,
int);
void rpc_wake_up(struct rpc_wait_queue *);
struct rpc_task *rpc_wake_up_next(struct rpc_wait_queue *);
struct rpc_task *rpc_wake_up_first_on_wq(struct workqueue_struct *wq,

65
net/sunrpc/sched.c
View File

@ -440,14 +440,28 @@ static void __rpc_do_wake_up_task_on_wq(struct workqueue_struct *wq,
/*
* Wake up a queued task while the queue lock is being held
*/
static void rpc_wake_up_task_on_wq_queue_locked(struct workqueue_struct *wq,
struct rpc_wait_queue *queue, struct rpc_task *task)
static struct rpc_task *
rpc_wake_up_task_on_wq_queue_action_locked(struct workqueue_struct *wq,
struct rpc_wait_queue *queue, struct rpc_task *task,
bool (*action)(struct rpc_task *, void *), void *data)
{
if (RPC_IS_QUEUED(task)) {
smp_rmb();
if (task->tk_waitqueue == queue)
__rpc_do_wake_up_task_on_wq(wq, queue, task);
if (task->tk_waitqueue == queue) {
if (action == NULL || action(task, data)) {
__rpc_do_wake_up_task_on_wq(wq, queue, task);
return task;
}
}
}
return NULL;
}
static void
rpc_wake_up_task_on_wq_queue_locked(struct workqueue_struct *wq,
struct rpc_wait_queue *queue, struct rpc_task *task)
{
rpc_wake_up_task_on_wq_queue_action_locked(wq, queue, task, NULL, NULL);
}
/*
@ -481,6 +495,40 @@ void rpc_wake_up_queued_task(struct rpc_wait_queue *queue, struct rpc_task *task
}
EXPORT_SYMBOL_GPL(rpc_wake_up_queued_task);
static bool rpc_task_action_set_status(struct rpc_task *task, void *status)
{
task->tk_status = *(int *)status;
return true;
}
static void
rpc_wake_up_task_queue_set_status_locked(struct rpc_wait_queue *queue,
struct rpc_task *task, int status)
{
rpc_wake_up_task_on_wq_queue_action_locked(rpciod_workqueue, queue,
task, rpc_task_action_set_status, &status);
}
/**
* rpc_wake_up_queued_task_set_status - wake up a task and set task->tk_status
* @queue: pointer to rpc_wait_queue
* @task: pointer to rpc_task
* @status: integer error value
*
* If @task is queued on @queue, then it is woken up, and @task->tk_status is
* set to the value of @status.
*/
void
rpc_wake_up_queued_task_set_status(struct rpc_wait_queue *queue,
struct rpc_task *task, int status)
{
if (!RPC_IS_QUEUED(task))
return;
spin_lock_bh(&queue->lock);
rpc_wake_up_task_queue_set_status_locked(queue, task, status);
spin_unlock_bh(&queue->lock);
}
/*
* Wake up the next task on a priority queue.
*/
@ -553,12 +601,9 @@ struct rpc_task *rpc_wake_up_first_on_wq(struct workqueue_struct *wq,
queue, rpc_qname(queue));
spin_lock_bh(&queue->lock);
task = __rpc_find_next_queued(queue);
if (task != NULL) {
if (func(task, data))
rpc_wake_up_task_on_wq_queue_locked(wq, queue, task);
else
task = NULL;
}
if (task != NULL)
task = rpc_wake_up_task_on_wq_queue_action_locked(wq, queue,
task, func, data);
spin_unlock_bh(&queue->lock);
return task;