int bch2_unlink_trans(struct btree_trans *trans,
		      subvol_inum dir,
		      struct bch_inode_unpacked *dir_u,
		      struct bch_inode_unpacked *inode_u,
		      const struct qstr *name,
		      bool deleting_snapshot)
int bch2_unlink_trans(struct btree_trans *trans,
		      subvol_inum dir,
		      struct bch_inode_unpacked *dir_u,
		      struct bch_inode_unpacked *inode_u,
		      const struct qstr *name,
		      bool deleting_subvol)