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-rw-r--r--include/linux/ioprio.h14
1 files changed, 14 insertions, 0 deletions
diff --git a/include/linux/ioprio.h b/include/linux/ioprio.h
index 2a3bb1bb743..f98a656b17e 100644
--- a/include/linux/ioprio.h
+++ b/include/linux/ioprio.h
@@ -68,6 +68,20 @@ static inline int task_nice_ioprio(struct task_struct *task)
}
/*
+ * This is for the case where the task hasn't asked for a specific IO class.
+ * Check for idle and rt task process, and return appropriate IO class.
+ */
+static inline int task_nice_ioclass(struct task_struct *task)
+{
+ if (task->policy == SCHED_IDLE)
+ return IOPRIO_CLASS_IDLE;
+ else if (task->policy == SCHED_FIFO || task->policy == SCHED_RR)
+ return IOPRIO_CLASS_RT;
+ else
+ return IOPRIO_CLASS_BE;
+}
+
+/*
* For inheritance, return the highest of the two given priorities
*/
extern int ioprio_best(unsigned short aprio, unsigned short bprio);