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block: add a bio_chain_and_submit helper

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This is basically blk_next_bio just with the bio allocation moved
to the caller to allow for more flexible bio handling in the caller.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20240506042027.2289826-4-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig 2024-05-06 06:20:24 +02:00 committed by Jens Axboe
parent 30f1e72414
commit 81c2168c22
2 changed files with 20 additions and 8 deletions
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27
block/bio.c
View File

@ -345,17 +345,28 @@ void bio_chain(struct bio *bio, struct bio *parent)
}
EXPORT_SYMBOL(bio_chain);
/**
* bio_chain_and_submit - submit a bio after chaining it to another one
* @prev: bio to chain and submit
* @new: bio to chain to
*
* If @prev is non-NULL, chain it to @new and submit it.
*
* Return: @new.
*/
struct bio *bio_chain_and_submit(struct bio *prev, struct bio *new)
{
if (prev) {
bio_chain(prev, new);
submit_bio(prev);
}
return new;
}
struct bio *blk_next_bio(struct bio *bio, struct block_device *bdev,
unsigned int nr_pages, blk_opf_t opf, gfp_t gfp)
{
struct bio *new = bio_alloc(bdev, nr_pages, opf, gfp);
if (bio) {
bio_chain(bio, new);
submit_bio(bio);
}
return new;
return bio_chain_and_submit(bio, bio_alloc(bdev, nr_pages, opf, gfp));
}
EXPORT_SYMBOL_GPL(blk_next_bio);

1
include/linux/bio.h
View File

@ -831,5 +831,6 @@ static inline void bio_clear_polled(struct bio *bio)
struct bio *blk_next_bio(struct bio *bio, struct block_device *bdev,
unsigned int nr_pages, blk_opf_t opf, gfp_t gfp);
struct bio *bio_chain_and_submit(struct bio *prev, struct bio *new);
#endif /* __LINUX_BIO_H */