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block: add a bio_await_chain helper

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Add a helper to wait for an entire chain of bios to complete.

[hch: split from a larger patch, moved and changed the name now that it
 is non-static]

Signed-off-by: Keith Busch <kbusch@kernel.org>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20240506042027.2289826-6-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Keith Busch 2024-05-06 06:20:26 +02:00 committed by Jens Axboe
parent e8b4869bc7
commit 0f8e9ecc46
2 changed files with 21 additions and 0 deletions
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20
block/bio.c
View File

@ -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))

1
block/blk.h
View File

@ -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)
{