[PATCH 4/8] block: Return effective IO priority from get_current_ioprio()

[Jan Kara <jack@suse.cz>]

get_current_ioprio() is used to initialize IO priority of various
requests. As such it should be returning the effective IO priority of
the task (i.e., reflecting the fact that unset IO priority should get
set based on task's CPU priority) so that the conversion is concentrated
in one place.

Signed-off-by: Jan Kara <jack@suse.cz>
---
 include/linux/ioprio.h | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/include/linux/ioprio.h b/include/linux/ioprio.h
index d9dc78a15301..519d51fc8902 100644
--- a/include/linux/ioprio.h
+++ b/include/linux/ioprio.h
@@ -53,10 +53,17 @@ static inline int task_nice_ioclass(struct task_struct *task)
 static inline int get_current_ioprio(void)
 {
 	struct io_context *ioc = current->io_context;
+	int prio;
 
 	if (ioc)
-		return ioc->ioprio;
-	return IOPRIO_DEFAULT;
+		prio = ioc->ioprio;
+	else
+		prio = IOPRIO_DEFAULT;
+
+	if (IOPRIO_PRIO_CLASS(prio) == IOPRIO_CLASS_NONE)
+		prio = IOPRIO_PRIO_VALUE(task_nice_ioclass(current),
+					 task_nice_ioprio(current));
+	return prio;
 }
 
 extern int set_task_ioprio(struct task_struct *task, int ioprio);
-- 
2.35.3