diff options
| -rw-r--r-- | block/bio.c | 20 | ||||
| -rw-r--r-- | block/blk.h | 1 |
2 files changed, 21 insertions, 0 deletions
diff --git a/block/bio.c b/block/bio.c index d82ef4fd545c..dce12a0efdea 100644 --- a/block/bio.c +++ b/block/bio.c @@ -1395,6 +1395,26 @@ int submit_bio_wait(struct bio *bio) } EXPORT_SYMBOL(submit_bio_wait); +static void bio_wait_end_io(struct bio *bio) +{ + complete(bio->bi_private); + bio_put(bio); +} + +/* + * bio_await_chain - ends @bio and waits for every chained bio to complete + */ +void bio_await_chain(struct bio *bio) +{ + DECLARE_COMPLETION_ONSTACK_MAP(done, + bio->bi_bdev->bd_disk->lockdep_map); + + bio->bi_private = &done; + bio->bi_end_io = bio_wait_end_io; + bio_endio(bio); + blk_wait_io(&done); +} + void __bio_advance(struct bio *bio, unsigned bytes) { if (bio_integrity(bio)) diff --git a/block/blk.h b/block/blk.h index ee4f782d1496..d5107e65355e 100644 --- a/block/blk.h +++ b/block/blk.h @@ -38,6 +38,7 @@ void __blk_mq_unfreeze_queue(struct request_queue *q, bool force_atomic); void blk_queue_start_drain(struct request_queue *q); int __bio_queue_enter(struct request_queue *q, struct bio *bio); void submit_bio_noacct_nocheck(struct bio *bio); +void bio_await_chain(struct bio *bio); static inline bool blk_try_enter_queue(struct request_queue *q, bool pm) { |