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 (file)
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -2671,7 +2671,7 @@ static void queue_unplugged(struct request_queue *q, unsigned int depth)
                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;
@@ -2733,28 +2733,16 @@ static void flush_plug_list(struct blk_plug *plug)
 
        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);
-}
-EXPORT_SYMBOL(blk_finish_plug);
+       blk_flush_plug_list(plug);
 
-void __blk_flush_plug(struct task_struct *tsk, struct blk_plug *plug)
-{
-       __blk_finish_plug(tsk, plug);
-       tsk->plug = plug;
+       if (plug == current->plug)
+               current->plug = NULL;
 }
-EXPORT_SYMBOL(__blk_flush_plug);
+EXPORT_SYMBOL(blk_finish_plug);
 
 int __init blk_dev_init(void)
 {

diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index c07ffaf..ffe48ff 100644 (file)
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -865,14 +865,14 @@ struct blk_plug {
 
 extern void blk_start_plug(struct blk_plug *);
 extern void blk_finish_plug(struct blk_plug *);
-extern void __blk_flush_plug(struct task_struct *, struct blk_plug *);
+extern void blk_flush_plug_list(struct blk_plug *);
 
 static inline void blk_flush_plug(struct task_struct *tsk)
 {
        struct blk_plug *plug = tsk->plug;
 
-       if (unlikely(plug))
-               __blk_flush_plug(tsk, plug);
+       if (plug)
+               blk_flush_plug_list(plug);
 }
 
 static inline bool blk_needs_flush_plug(struct task_struct *tsk)