nfsd load

• https://elixir.bootlin.com/linux/v5.7/source/fs/nfsd/nfsctl.c#L1425

    MODULE_ALIAS_FS("nfsd");

will make alias fs-nfsd nfsd appear in /lib/modules/$(uname -r)/modules.aliases, so when mount -t nfsd nfsd /proc/fs/nfsd is executed by proc-fs-nfsd.mount, the module is requested by https://elixir.bootlin.com/linux/v5.7/source/fs/filesystems.c#L273

    struct file_system_type *get_fs_type(const char *name)
    {
        /* ... */
	fs = __get_fs_type(name, len);
	if (!fs && (request_module("fs-%.*s", len, name) == 0)) {
		fs = __get_fs_type(name, len);
        /* ... */