+ src_type = bkey_s_c_to_dirent(old_src).v->d_type;
+
+ if (src_type == DT_SUBVOL && mode == BCH_RENAME_EXCHANGE)
+ return -EOPNOTSUPP;
+
+
+ /* Lookup dst: */
+ if (mode == BCH_RENAME) {
+ /*
+ * Note that we're _not_ checking if the target already exists -
+ * we're relying on the VFS to do that check for us for
+ * correctness:
+ */
+ ret = bch2_hash_hole(trans, &dst_iter, bch2_dirent_hash_desc,
+ dst_hash, dst_dir, dst_name);
+ if (ret)
+ goto out;
+ } else {
+ ret = bch2_hash_lookup(trans, &dst_iter, bch2_dirent_hash_desc,
+ dst_hash, dst_dir, dst_name,
+ BTREE_ITER_INTENT);
+ if (ret)
+ goto out;
+
+ old_dst = bch2_btree_iter_peek_slot(&dst_iter);
+ ret = bkey_err(old_dst);
+ if (ret)
+ goto out;
+
+ ret = bch2_dirent_read_target(trans, dst_dir,
+ bkey_s_c_to_dirent(old_dst), dst_inum);
+ if (ret)
+ goto out;
+
+ dst_type = bkey_s_c_to_dirent(old_dst).v->d_type;
+
+ if (dst_type == DT_SUBVOL)
+ return -EOPNOTSUPP;
+ }
+
+ if (mode != BCH_RENAME_EXCHANGE)
+ *src_offset = dst_iter.pos.offset;