From 7ecc56c62b27d93838ee67fc2c7a1c3c480aea04 Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Wed, 4 May 2022 07:29:50 -0700 Subject: 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: Christoph Hellwig Reviewed-by: Mike Snitzer Link: https://lore.kernel.org/r/20220504142950.567582-3-hch@lst.de Signed-off-by: Jens Axboe --- block/bio.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-) (limited to 'block/bio.c') diff --git a/block/bio.c b/block/bio.c index aa94195ffd02..a3893d80dccc 100644 --- a/block/bio.c +++ b/block/bio.c @@ -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; - bio_clone_blkg_association(bio, bio_src); + 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; -- cgit v1.2.3-58-ga151