diff options
Diffstat (limited to 'include/linux/blkdev.h')
| -rw-r--r-- | include/linux/blkdev.h | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index f55b2a8b6610..5873037eeb91 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -871,6 +871,31 @@ struct request_queue *blk_alloc_queue(gfp_t); struct request_queue *blk_alloc_queue_node(gfp_t, int); extern void blk_put_queue(struct request_queue *); +struct blk_plug { + unsigned long magic; + struct list_head list; + unsigned int should_sort; +}; + +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 *); + +static inline void blk_flush_plug(struct task_struct *tsk) +{ + struct blk_plug *plug = tsk->plug; + + if (unlikely(plug)) + __blk_flush_plug(tsk, plug); +} + +static inline bool blk_needs_flush_plug(struct task_struct *tsk) +{ + struct blk_plug *plug = tsk->plug; + + return plug && !list_empty(&plug->list); +} + /* * tag stuff */ @@ -1294,6 +1319,23 @@ static inline long nr_blockdev_pages(void) return 0; } +static inline void blk_start_plug(struct list_head *list) +{ +} + +static inline void blk_finish_plug(struct list_head *list) +{ +} + +static inline void blk_flush_plug(struct task_struct *tsk) +{ +} + +static inline bool blk_needs_flush_plug(struct task_struct *tsk) +{ + return false; +} + #endif /* CONFIG_BLOCK */ #endif |