init/noinitramfs.c

Source file repositories/reference/linux-study-clean/init/noinitramfs.c

File Facts

System
Linux kernel
Corpus path
init/noinitramfs.c
Extension
.c
Size
862 bytes
Lines
43
Domain
Core OS
Bucket
Boot And Init
Inferred role
Core OS: implementation source
Status
source implementation candidate

Why This File Exists

Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0-only
/*
 * init/noinitramfs.c
 *
 * Copyright (C) 2006, NXP Semiconductors, All Rights Reserved
 * Author: Jean-Paul Saman <jean-paul.saman@nxp.com>
 */
#include <linux/init.h>
#include <linux/stat.h>
#include <linux/kdev_t.h>
#include <linux/syscalls.h>
#include <linux/init_syscalls.h>
#include <linux/umh.h>

/*
 * Create a simple rootfs that is similar to the default initramfs
 */
static int __init default_rootfs(void)
{
	int err;

	usermodehelper_enable();
	err = init_mkdir("/dev", 0755);
	if (err < 0)
		goto out;

	err = init_mknod("/dev/console", S_IFCHR | S_IRUSR | S_IWUSR,
			new_encode_dev(MKDEV(5, 1)));
	if (err < 0)
		goto out;

	err = init_mkdir("/root", 0700);
	if (err < 0)
		goto out;

	return 0;

out:
	printk(KERN_WARNING "Failed to create a rootfs\n");
	return err;
}
rootfs_initcall(default_rootfs);

Annotation

Implementation Notes