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-rw-r--r--libbcachefs/super-io.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/libbcachefs/super-io.c b/libbcachefs/super-io.c
index a2b981a3..9772d597 100644
--- a/libbcachefs/super-io.c
+++ b/libbcachefs/super-io.c
@@ -624,7 +624,7 @@ static void write_one_super(struct bch_fs *c, struct bch_dev *ca, unsigned idx)
bio_set_dev(bio, ca->disk_sb.bdev);
bio->bi_iter.bi_sector = le64_to_cpu(sb->offset);
bio->bi_iter.bi_size =
- roundup(vstruct_bytes(sb),
+ roundup((size_t) vstruct_bytes(sb),
bdev_logical_block_size(ca->disk_sb.bdev));
bio->bi_end_io = write_super_endio;
bio->bi_private = ca;