Commit 7ecc56c6 authored by Christoph Hellwig's avatar Christoph Hellwig Committed by Jens Axboe
Browse files

block: allow passing a NULL bdev to bio_alloc_clone/bio_init_clone 



Device mapper wants to allocate a bio before knowing the device it
gets send to, so add explicit support for that.

Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
Reviewed-by: default avatarMike Snitzer <snitzer@kernel.org>
Link: https://lore.kernel.org/r/20220504142950.567582-3-hch@lst.de


Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent 51361684

block/bio.c

+6 −4
Original line number Diff line number Diff line
@@ -761,13 +761,15 @@ static int __bio_clone(struct bio *bio, struct bio *bio_src, gfp_t gfp) 
	bio_set_flag(bio, BIO_CLONED);

	if (bio_flagged(bio_src, BIO_THROTTLED))

		bio_set_flag(bio, BIO_THROTTLED);

	if (bio->bi_bdev == bio_src->bi_bdev &&

	    bio_flagged(bio_src, BIO_REMAPPED))

		bio_set_flag(bio, BIO_REMAPPED);

	bio->bi_ioprio = bio_src->bi_ioprio;

	bio->bi_iter = bio_src->bi_iter;



	if (bio->bi_bdev) {

		if (bio->bi_bdev == bio_src->bi_bdev &&

		    bio_flagged(bio_src, BIO_REMAPPED))

			bio_set_flag(bio, BIO_REMAPPED);

		bio_clone_blkg_association(bio, bio_src);

	}



	if (bio_crypt_clone(bio, bio_src, gfp) < 0)

		return -ENOMEM;