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authorChristoph Hellwig <hch@lst.de>2022-05-04 07:29:50 -0700
committerJens Axboe <axboe@kernel.dk>2022-05-04 18:29:52 -0600
commit7ecc56c62b27d93838ee67fc2c7a1c3c480aea04 (patch)
treeafab60eadb98d3a8a76c957ab39f47d5da3d99cc
parent513616843d736fb7161b4460cdfe5aa825c5902c (diff)
downloadlinux-7ecc56c62b27d93838ee67fc2c7a1c3c480aea04.tar.bz2
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 <hch@lst.de> Reviewed-by: Mike Snitzer <snitzer@kernel.org> Link: https://lore.kernel.org/r/20220504142950.567582-3-hch@lst.de Signed-off-by: Jens Axboe <axboe@kernel.dk>
-rw-r--r--block/bio.c10
1 files changed, 6 insertions, 4 deletions
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;