diff options
Diffstat (limited to 'block/blk-mq.h')
| -rw-r--r-- | block/blk-mq.h | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/block/blk-mq.h b/block/blk-mq.h index d516c7a46f57..e4c396204928 100644 --- a/block/blk-mq.h +++ b/block/blk-mq.h @@ -374,5 +374,21 @@ static inline bool hctx_may_queue(struct blk_mq_hw_ctx *hctx, return __blk_mq_active_requests(hctx) < depth; } +/* run the code block in @dispatch_ops with rcu/srcu read lock held */ +#define blk_mq_run_dispatch_ops(hctx, dispatch_ops) \ +do { \ + if (!((hctx)->flags & BLK_MQ_F_BLOCKING)) { \ + rcu_read_lock(); \ + (dispatch_ops); \ + rcu_read_unlock(); \ + } else { \ + int srcu_idx; \ + \ + might_sleep(); \ + srcu_idx = srcu_read_lock((hctx)->srcu); \ + (dispatch_ops); \ + srcu_read_unlock((hctx)->srcu, srcu_idx); \ + } \ +} while (0) #endif |