__insert_pending
if (!__insert_pending(b, w)) {
err3 = __insert_pending(inode, lblk, &pr1);
err3 = __insert_pending(inode, end, &pr2);
ret = __insert_pending(inode, first, prealloc);
ret = __insert_pending(inode, last, prealloc);
ret = __insert_pending(inode, first, prealloc);
ret = __insert_pending(inode, last, prealloc);