diff options
Diffstat (limited to 'block/blk.h')
| -rw-r--r-- | block/blk.h | 36 |
1 files changed, 33 insertions, 3 deletions
diff --git a/block/blk.h b/block/blk.h index 8d421156fefb..5bca2668e1bf 100644 --- a/block/blk.h +++ b/block/blk.h @@ -127,9 +127,6 @@ static inline int blk_should_fake_timeout(struct request_queue *q) } #endif -void get_io_context(struct io_context *ioc); -struct io_context *current_io_context(gfp_t gfp_flags, int node); - int ll_back_merge_fn(struct request_queue *q, struct request *req, struct bio *bio); int ll_front_merge_fn(struct request_queue *q, struct request *req, @@ -198,6 +195,39 @@ static inline int blk_do_io_stat(struct request *rq) (rq->cmd_flags & REQ_DISCARD)); } +/* + * Internal io_context interface + */ +void get_io_context(struct io_context *ioc); + +void create_io_context_slowpath(struct task_struct *task, gfp_t gfp_mask, + int node); + +/** + * create_io_context - try to create task->io_context + * @task: target task + * @gfp_mask: allocation mask + * @node: allocation node + * + * If @task->io_context is %NULL, allocate a new io_context and install it. + * Returns the current @task->io_context which may be %NULL if allocation + * failed. + * + * Note that this function can't be called with IRQ disabled because + * task_lock which protects @task->io_context is IRQ-unsafe. + */ +static inline struct io_context *create_io_context(struct task_struct *task, + gfp_t gfp_mask, int node) +{ + WARN_ON_ONCE(irqs_disabled()); + if (unlikely(!task->io_context)) + create_io_context_slowpath(task, gfp_mask, node); + return task->io_context; +} + +/* + * Internal throttling interface + */ #ifdef CONFIG_BLK_DEV_THROTTLING extern bool blk_throtl_bio(struct request_queue *q, struct bio *bio); extern void blk_throtl_drain(struct request_queue *q); |