Release 4.18 init/do_mounts_initrd.c
// SPDX-License-Identifier: GPL-2.0
/*
* Many of the syscalls used in this file expect some of the arguments
* to be __user pointers not __kernel pointers. To limit the sparse
* noise, turn off sparse checking for this file.
*/
#ifdef __CHECKER__
#undef __CHECKER__
#warning "Sparse checking disabled for this file"
#endif
#include <linux/unistd.h>
#include <linux/kernel.h>
#include <linux/fs.h>
#include <linux/minix_fs.h>
#include <linux/romfs_fs.h>
#include <linux/initrd.h>
#include <linux/sched.h>
#include <linux/freezer.h>
#include <linux/kmod.h>
#include "do_mounts.h"
unsigned long initrd_start, initrd_end;
int initrd_below_start_ok;
unsigned int real_root_dev;
/* do_proc_dointvec cannot handle kdev_t */
static int __initdata mount_initrd = 1;
static int __init no_initrd(char *str)
{
mount_initrd = 0;
return 1;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Linus Torvalds | 18 | 100.00% | 1 | 100.00% |
Total | 18 | 100.00% | 1 | 100.00% |
__setup("noinitrd", no_initrd);
static int init_linuxrc(struct subprocess_info *info, struct cred *new)
{
ksys_unshare(CLONE_FS | CLONE_FILES);
/* stdin/stdout/stderr for /linuxrc */
ksys_open("/dev/console", O_RDWR, 0);
ksys_dup(0);
ksys_dup(0);
/* move initrd over / and chdir/chroot in initrd root */
ksys_chdir("/root");
ksys_mount(".", "/", NULL, MS_MOVE, NULL);
ksys_chroot(".");
ksys_setsid();
return 0;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Al Viro | 47 | 64.38% | 2 | 20.00% |
Linus Torvalds | 18 | 24.66% | 1 | 10.00% |
Dominik Brodowski | 8 | 10.96% | 7 | 70.00% |
Total | 73 | 100.00% | 10 | 100.00% |
static void __init handle_initrd(void)
{
struct subprocess_info *info;
static char *argv[] = { "linuxrc", NULL, };
extern char *envp_init[];
int error;
real_root_dev = new_encode_dev(ROOT_DEV);
create_dev("/dev/root.old", Root_RAM0);
/* mount initrd on rootfs' /root */
mount_block_root("/dev/root.old", root_mountflags & ~MS_RDONLY);
ksys_mkdir("/old", 0700);
ksys_chdir("/old");
/* try loading default modules from initrd */
load_default_modules();
/*
* In case that a resume from disk is carried out by linuxrc or one of
* its children, we need to tell the freezer not to wait for us.
*/
current->flags |= PF_FREEZER_SKIP;
info = call_usermodehelper_setup("/linuxrc", argv, envp_init,
GFP_KERNEL, init_linuxrc, NULL, NULL);
if (!info)
return;
call_usermodehelper_exec(info, UMH_WAIT_PROC);
current->flags &= ~PF_FREEZER_SKIP;
/* move initrd to rootfs' /old */
ksys_mount("..", ".", NULL, MS_MOVE, NULL);
/* switch root and cwd back to / of rootfs */
ksys_chroot("..");
if (new_decode_dev(real_root_dev) == Root_RAM0) {
ksys_chdir("/old");
return;
}
ksys_chdir("/");
ROOT_DEV = new_decode_dev(real_root_dev);
mount_root();
printk(KERN_NOTICE "Trying to move old root to /initrd ... ");
error = ksys_mount("/old", "/root/initrd", NULL, MS_MOVE, NULL);
if (!error)
printk("okay\n");
else {
int fd = ksys_open("/dev/root.old", O_RDWR, 0);
if (error == -ENOENT)
printk("/initrd does not exist. Ignored.\n");
else
printk("failed\n");
printk(KERN_NOTICE "Unmounting old root\n");
ksys_umount("/old", MNT_DETACH);
printk(KERN_NOTICE "Trying to free ramdisk memory ... ");
if (fd < 0) {
error = fd;
} else {
error = ksys_ioctl(fd, BLKFLSBUF, 0);
ksys_close(fd);
}
printk(!error ? "okay\n" : "failed\n");
}
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Linus Torvalds | 193 | 64.77% | 2 | 11.11% |
Al Viro | 40 | 13.42% | 3 | 16.67% |
Lucas De Marchi | 22 | 7.38% | 1 | 5.56% |
Rafael J. Wysocki | 14 | 4.70% | 1 | 5.56% |
Jay Lan | 13 | 4.36% | 1 | 5.56% |
Dominik Brodowski | 11 | 3.69% | 8 | 44.44% |
Tejun Heo | 4 | 1.34% | 1 | 5.56% |
Andrew Morton | 1 | 0.34% | 1 | 5.56% |
Total | 298 | 100.00% | 18 | 100.00% |
bool __init initrd_load(void)
{
if (mount_initrd) {
create_dev("/dev/ram", Root_RAM0);
/*
* Load the initrd data into /dev/ram0. Execute it as initrd
* unless /dev/ram0 is supposed to be our actual root device,
* in that case the ram disk is just set up here, and gets
* mounted in the normal path.
*/
if (rd_load_image("/initrd.image") && ROOT_DEV != Root_RAM0) {
ksys_unlink("/initrd.image");
handle_initrd();
return true;
}
}
ksys_unlink("/initrd.image");
return false;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Linus Torvalds | 36 | 66.67% | 1 | 20.00% |
Andrew Morton | 10 | 18.52% | 1 | 20.00% |
Al Viro | 3 | 5.56% | 1 | 20.00% |
Yaowei Bai | 3 | 5.56% | 1 | 20.00% |
Dominik Brodowski | 2 | 3.70% | 1 | 20.00% |
Total | 54 | 100.00% | 5 | 100.00% |
Overall Contributors
Person | Tokens | Prop | Commits | CommitProp |
Linus Torvalds | 302 | 58.75% | 2 | 6.67% |
Al Viro | 93 | 18.09% | 5 | 16.67% |
Andrew Morton | 23 | 4.47% | 2 | 6.67% |
Lucas De Marchi | 22 | 4.28% | 1 | 3.33% |
Dominik Brodowski | 21 | 4.09% | 12 | 40.00% |
Rafael J. Wysocki | 14 | 2.72% | 1 | 3.33% |
Jay Lan | 13 | 2.53% | 1 | 3.33% |
H Hartley Sweeten | 12 | 2.33% | 1 | 3.33% |
Tejun Heo | 4 | 0.78% | 1 | 3.33% |
Adrian Bunk | 3 | 0.58% | 1 | 3.33% |
Yaowei Bai | 3 | 0.58% | 1 | 3.33% |
Nigel Cunningham | 3 | 0.58% | 1 | 3.33% |
Greg Kroah-Hartman | 1 | 0.19% | 1 | 3.33% |
Total | 514 | 100.00% | 30 | 100.00% |
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