A new field was introduced in 74d46992e0d9dee7f1f376de0d56d31614c8a17a, bi_partno, instead of using bdev->bd_contains and encoding the partition information in the bi_bdev field. __bio_clone_fast was changed to copy the disk information, but not the partition information. At minimum, this regressed bcache and caused data corruption. Signed-off-by: Michael Lyle <mlyle@xxxxxxxx> Fixes: 74d46992e0d9dee7f1f376de0d56d31614c8a17a Reported-by: Pavel Goran <via-bcache@xxxxxxxxxxxx> Reported-by: Campbell Steven <casteven@xxxxxxxxx> Cc: Christoph Hellwig <hch@xxxxxx> Cc: Jens Axboe <axboe@xxxxxxxxx> Cc: <stable@xxxxxxxxxxxxxxx> --- block/bio.c | 1 + 1 file changed, 1 insertion(+) diff --git a/block/bio.c b/block/bio.c index 101c2a9b5481..33fa6b4af312 100644 --- a/block/bio.c +++ b/block/bio.c @@ -597,6 +597,7 @@ void __bio_clone_fast(struct bio *bio, struct bio *bio_src) * so we don't set nor calculate new physical/hw segment counts here */ bio->bi_disk = bio_src->bi_disk; + bio->bi_partno = bio_src->bi_partno; bio_set_flag(bio, BIO_CLONED); bio->bi_opf = bio_src->bi_opf; bio->bi_write_hint = bio_src->bi_write_hint; -- 2.14.1