xfs_btree_alloc_block
error = xfs_btree_alloc_block(cur, &lptr, &rptr, stat);
error = xfs_btree_alloc_block(cur, &aptr, &nptr, stat);
error = xfs_btree_alloc_block(cur, &rptr, &lptr, stat);
TRACE_EVENT(xfs_btree_alloc_block,