diff --git a/lustre/osd-zfs/osd_object.c b/lustre/osd-zfs/osd_object.c
index fa9ec89..4079eeb 100644
--- a/lustre/osd-zfs/osd_object.c
+++ b/lustre/osd-zfs/osd_object.c
@@ -1390,8 +1390,9 @@ static dmu_buf_t *osd_mkreg(const struct lu_env *env, struct osd_object *obj,
struct lu_attr *la, uint64_t parent,
struct osd_thandle *oh)
{
- dmu_buf_t *db;
- int rc;
+ const struct lu_fid *fid = lu_object_fid(&obj->oo_dt.do_lu);
+ dmu_buf_t *db;
+ int rc;
struct osd_device *osd = osd_obj2dev(obj);
LASSERT(S_ISREG(la->la_mode));
@@ -1406,7 +1407,7 @@ static dmu_buf_t *osd_mkreg(const struct lu_env *env, struct osd_object *obj,
* blocksize is selected based on the file size rather than the
* making broad assumptions based on the osd type.
*/
- if (!lu_device_is_md(osd2lu_dev(osd))) {
+ if ((fid_is_idif(fid) || fid_is_norm(fid)) && osd->od_is_ost) {
rc = -dmu_object_set_blocksize(osd->od_os, db->db_object,
osd->od_max_blksz, 0, oh->ot_tx);
if (unlikely(rc)) {