Method opendir

fs/extfs/extfs.cpp:1428–1436

    }

    photon::fs::DIR *opendir(const char *path) override {
        std::vector<::dirent> dirs;
        auto ret = do_ext2fs_readdir(fs, path, &dirs);
        if (ret) {
            errno = -ret;
            return nullptr;
        }
        return new ExtDIR(dirs);
    }

    IFileSystem *filesystem() {
        return this;