block: cleanup the block plug helper functions
It's a bit of a mess currently. task->plug is being cleared
and reset in __blk_finish_plug(), and blk_finish_plug() is
testing for a NULL plug which cannot happen even from schedule()
anymore since it uses blk_needs_flush_plug() to determine
whether to call into this function at all.
So get rid of some of the cruft.
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
diff --git a/block/blk-core.c b/block/blk-core.c
index 36b1a75..b598fa7 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -2671,7 +2671,7 @@
q->unplugged_fn(q);
}
-static void flush_plug_list(struct blk_plug *plug)
+void blk_flush_plug_list(struct blk_plug *plug)
{
struct request_queue *q;
unsigned long flags;
@@ -2733,29 +2733,17 @@
local_irq_restore(flags);
}
-
-static void __blk_finish_plug(struct task_struct *tsk, struct blk_plug *plug)
-{
- flush_plug_list(plug);
-
- if (plug == tsk->plug)
- tsk->plug = NULL;
-}
+EXPORT_SYMBOL(blk_flush_plug_list);
void blk_finish_plug(struct blk_plug *plug)
{
- if (plug)
- __blk_finish_plug(current, plug);
+ blk_flush_plug_list(plug);
+
+ if (plug == current->plug)
+ current->plug = NULL;
}
EXPORT_SYMBOL(blk_finish_plug);
-void __blk_flush_plug(struct task_struct *tsk, struct blk_plug *plug)
-{
- __blk_finish_plug(tsk, plug);
- tsk->plug = plug;
-}
-EXPORT_SYMBOL(__blk_flush_plug);
-
int __init blk_dev_init(void)
{
BUILD_BUG_ON(__REQ_NR_BITS > 8 *