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SUNRPC: Add function rpc_sleep_on_timeout()

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Clean up the RPC task sleep interfaces by replacing the task->tk_timeout
'hidden parameter' to rpc_sleep_on() with a new function that takes an
absolute timeout.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
This commit is contained in:
Trond Myklebust
2019-04-07 13:58:49 -04:00
committed by Anna Schumaker
parent 8357a9b60f
commit 6b2e685627
7 changed files with 103 additions and 42 deletions
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73
net/sunrpc/sched.c
View File

@@ -66,7 +66,7 @@ struct workqueue_struct *xprtiod_workqueue __read_mostly;
static void
__rpc_disable_timer(struct rpc_wait_queue *queue, struct rpc_task *task)
{
if (task->tk_timeout == 0)
if (list_empty(&task->u.tk_wait.timer_list))
return;
dprintk("RPC: %5u disabling timer\n", task->tk_pid);
task->tk_timeout = 0;
@@ -86,17 +86,15 @@ rpc_set_queue_timer(struct rpc_wait_queue *queue, unsigned long expires)
* Set up a timer for the current task.
*/
static void
__rpc_add_timer(struct rpc_wait_queue *queue, struct rpc_task *task)
__rpc_add_timer(struct rpc_wait_queue *queue, struct rpc_task *task,
unsigned long timeout)
{
if (!task->tk_timeout)
return;
dprintk("RPC: %5u setting alarm for %u ms\n",
task->tk_pid, jiffies_to_msecs(task->tk_timeout));
task->tk_pid, jiffies_to_msecs(timeout - jiffies));
task->u.tk_wait.expires = jiffies + task->tk_timeout;
if (list_empty(&queue->timer_list.list) || time_before(task->u.tk_wait.expires, queue->timer_list.expires))
rpc_set_queue_timer(queue, task->u.tk_wait.expires);
task->tk_timeout = timeout;
if (list_empty(&queue->timer_list.list) || time_before(timeout, queue->timer_list.expires))
rpc_set_queue_timer(queue, timeout);
list_add(&task->u.tk_wait.timer_list, &queue->timer_list.list);
}
@@ -188,6 +186,7 @@ static void __rpc_add_wait_queue(struct rpc_wait_queue *queue,
if (RPC_IS_QUEUED(task))
return;
INIT_LIST_HEAD(&task->u.tk_wait.timer_list);
if (RPC_IS_PRIORITY(queue))
__rpc_add_wait_queue_priority(queue, task, queue_priority);
else if (RPC_IS_SWAPPER(task))
@@ -371,7 +370,17 @@ static void __rpc_sleep_on_priority(struct rpc_wait_queue *q,
__rpc_add_wait_queue(q, task, queue_priority);
__rpc_add_timer(q, task);
}
static void __rpc_sleep_on_priority_timeout(struct rpc_wait_queue *q,
struct rpc_task *task, unsigned long timeout,
unsigned char queue_priority)
{
if (time_is_after_jiffies(timeout)) {
__rpc_sleep_on_priority(q, task, queue_priority);
__rpc_add_timer(q, task, timeout);
} else
task->tk_status = -ETIMEDOUT;
}
static void rpc_set_tk_callback(struct rpc_task *task, rpc_action action)
@@ -391,14 +400,32 @@ static bool rpc_sleep_check_activated(struct rpc_task *task)
return true;
}
void rpc_sleep_on(struct rpc_wait_queue *q, struct rpc_task *task,
rpc_action action)
void rpc_sleep_on_timeout(struct rpc_wait_queue *q, struct rpc_task *task,
rpc_action action, unsigned long timeout)
{
if (!rpc_sleep_check_activated(task))
return;
rpc_set_tk_callback(task, action);
/*
* Protect the queue operations.
*/
spin_lock_bh(&q->lock);
__rpc_sleep_on_priority_timeout(q, task, timeout, task->tk_priority);
spin_unlock_bh(&q->lock);
}
EXPORT_SYMBOL_GPL(rpc_sleep_on_timeout);
void rpc_sleep_on(struct rpc_wait_queue *q, struct rpc_task *task,
rpc_action action)
{
if (!rpc_sleep_check_activated(task))
return;
rpc_set_tk_callback(task, action);
WARN_ON_ONCE(task->tk_timeout != 0);
/*
* Protect the queue operations.
*/
@@ -408,12 +435,29 @@ void rpc_sleep_on(struct rpc_wait_queue *q, struct rpc_task *task,
}
EXPORT_SYMBOL_GPL(rpc_sleep_on);
void rpc_sleep_on_priority_timeout(struct rpc_wait_queue *q,
struct rpc_task *task, unsigned long timeout, int priority)
{
if (!rpc_sleep_check_activated(task))
return;
priority -= RPC_PRIORITY_LOW;
/*
* Protect the queue operations.
*/
spin_lock_bh(&q->lock);
__rpc_sleep_on_priority_timeout(q, task, timeout, priority);
spin_unlock_bh(&q->lock);
}
EXPORT_SYMBOL_GPL(rpc_sleep_on_priority_timeout);
void rpc_sleep_on_priority(struct rpc_wait_queue *q, struct rpc_task *task,
int priority)
{
if (!rpc_sleep_check_activated(task))
return;
WARN_ON_ONCE(task->tk_timeout != 0);
priority -= RPC_PRIORITY_LOW;
/*
* Protect the queue operations.
@@ -711,7 +755,7 @@ static void __rpc_queue_timer_fn(struct timer_list *t)
spin_lock(&queue->lock);
expires = now = jiffies;
list_for_each_entry_safe(task, n, &queue->timer_list.list, u.tk_wait.timer_list) {
timeo = task->u.tk_wait.expires;
timeo = task->tk_timeout;
if (time_after_eq(now, timeo)) {
dprintk("RPC: %5u timeout\n", task->tk_pid);
task->tk_status = -ETIMEDOUT;
@@ -737,8 +781,7 @@ static void __rpc_atrun(struct rpc_task *task)
*/
void rpc_delay(struct rpc_task *task, unsigned long delay)
{
task->tk_timeout = delay;
rpc_sleep_on(&delay_queue, task, __rpc_atrun);
rpc_sleep_on_timeout(&delay_queue, task, __rpc_atrun, jiffies + delay);
}
EXPORT_SYMBOL_GPL(rpc_delay);