FUSE 错误: 传输端点未连接

我正在尝试实现 FUSE 文件系统，我收到了这个错误:

无法访问 MountDir: 传输端点未连接

这是程序的相关部分。有两个目录，MirrorDir和 MountDir，与所有代码在同一目录中。我这样称呼这个节目:

./myFS -o nonempty -o allow_other MirrorDir MountDir

有人知道我哪里做错了吗？

static struct fuse_operations xmp_oper = {
.getattr    = xmp_getattr,
.readdir    = xmp_readdir,
.open       = xmp_open,
.read       = xmp_read,
};


int main(int argc, char *argv[]) {
int fuse_stat;
char* mirrorDir;


mirrorDir = malloc(sizeof(strlen(argv[argc-2]+1)));
if (mirrorDir == NULL) {
perror("main calloc");
abort();
}


// Pull the rootdir out of the argument list and save it in my internal data
mirrorDir = realpath(argv[argc-2], NULL);


argv[argc-2] = argv[argc-1];
argv[argc-1] = NULL;
argc--;


// turn over control to fuse
fprintf(stderr, "about to call fuse_main\n");
fuse_stat = fuse_main(argc, argv, &xmp_oper, mirrorDir);
fprintf(stderr, "fuse_main returned %d\n", fuse_stat);
return fuse_stat;
}