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-rw-r--r--include/linux/ioprio.h27
1 files changed, 25 insertions, 2 deletions
diff --git a/include/linux/ioprio.h b/include/linux/ioprio.h
index 7578d4f6a969..b25377b6ea98 100644
--- a/include/linux/ioprio.h
+++ b/include/linux/ioprio.h
@@ -40,14 +40,37 @@ static inline int task_nice_ioclass(struct task_struct *task)
{
if (task->policy == SCHED_IDLE)
return IOPRIO_CLASS_IDLE;
- else if (task_is_realtime(task))
+ else if (rt_or_dl_task_policy(task))
return IOPRIO_CLASS_RT;
else
return IOPRIO_CLASS_BE;
}
#ifdef CONFIG_BLOCK
-int __get_task_ioprio(struct task_struct *p);
+/*
+ * If the task has set an I/O priority, use that. Otherwise, return
+ * the default I/O priority.
+ *
+ * Expected to be called for current task or with task_lock() held to keep
+ * io_context stable.
+ */
+static inline int __get_task_ioprio(struct task_struct *p)
+{
+ struct io_context *ioc = p->io_context;
+ int prio;
+
+ if (!ioc)
+ return IOPRIO_DEFAULT;
+
+ if (p != current)
+ lockdep_assert_held(&p->alloc_lock);
+
+ prio = ioc->ioprio;
+ if (IOPRIO_PRIO_CLASS(prio) == IOPRIO_CLASS_NONE)
+ prio = IOPRIO_PRIO_VALUE(task_nice_ioclass(p),
+ task_nice_ioprio(p));
+ return prio;
+}
#else
static inline int __get_task_ioprio(struct task_struct *p)
{