forked from luck/tmp_suning_uos_patched
87c4e19262
Using the fs-internal do_mknodat() helper allows us to get rid of fs-internal calls to the sys_mknodat() syscall. Introducing the ksys_mknod() wrapper allows us to avoid the in-kernel calls to sys_mknod() syscall. The ksys_ prefix denotes that this function is meant as a drop-in replacement for the syscall. In particular, it uses the same calling convention as sys_mknod(). This patch is part of a series which removes in-kernel calls to syscalls. On this basis, the syscall entry path can be streamlined. For details, see http://lkml.kernel.org/r/20180325162527.GA17492@light.dominikbrodowski.net Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
53 lines
1.5 KiB
C
53 lines
1.5 KiB
C
/*
|
|
* init/noinitramfs.c
|
|
*
|
|
* Copyright (C) 2006, NXP Semiconductors, All Rights Reserved
|
|
* Author: Jean-Paul Saman <jean-paul.saman@nxp.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; version 2 of the License.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*/
|
|
#include <linux/init.h>
|
|
#include <linux/stat.h>
|
|
#include <linux/kdev_t.h>
|
|
#include <linux/syscalls.h>
|
|
|
|
/*
|
|
* Create a simple rootfs that is similar to the default initramfs
|
|
*/
|
|
static int __init default_rootfs(void)
|
|
{
|
|
int err;
|
|
|
|
err = ksys_mkdir((const char __user __force *) "/dev", 0755);
|
|
if (err < 0)
|
|
goto out;
|
|
|
|
err = ksys_mknod((const char __user __force *) "/dev/console",
|
|
S_IFCHR | S_IRUSR | S_IWUSR,
|
|
new_encode_dev(MKDEV(5, 1)));
|
|
if (err < 0)
|
|
goto out;
|
|
|
|
err = ksys_mkdir((const char __user __force *) "/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);
|