Release 4.11 init/do_mounts_initrd.c

/*
 * 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;
}

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Linus Torvalds
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__setup("noinitrd", no_initrd);



static int init_linuxrc(struct subprocess_info *info, struct cred *new)
{
	sys_unshare(CLONE_FS | CLONE_FILES);
	/* stdin/stdout/stderr for /linuxrc */
	sys_open("/dev/console", O_RDWR, 0);
	sys_dup(0);
	sys_dup(0);
	/* move initrd over / and chdir/chroot in initrd root */
	sys_chdir("/root");
	sys_mount(".", "/", NULL, MS_MOVE, NULL);
	sys_chroot(".");
	sys_setsid();
	return 0;
}

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Al Viro
55
75.34%
2
66.67%
Linus Torvalds
18
24.66%
1
33.33%
Total
73
100.00%
3
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);
	sys_mkdir("/old", 0700);
	sys_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 */
	sys_mount("..", ".", NULL, MS_MOVE, NULL);
	/* switch root and cwd back to / of rootfs */
	sys_chroot("..");

	if (new_decode_dev(real_root_dev) == Root_RAM0) {
		sys_chdir("/old");
		return;
	}

	sys_chdir("/");
	ROOT_DEV = new_decode_dev(real_root_dev);
	mount_root();

	printk(KERN_NOTICE "Trying to move old root to /initrd ... ");
	error = sys_mount("/old", "/root/initrd", NULL, MS_MOVE, NULL);
	if (!error)
		printk("okay\n");
	else {
		int fd = sys_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");
		sys_umount("/old", MNT_DETACH);
		printk(KERN_NOTICE "Trying to free ramdisk memory ... ");
		if (fd < 0) {
			error = fd;
		} else {
			error = sys_ioctl(fd, BLKFLSBUF, 0);
			sys_close(fd);
		}
		printk(!error ? "okay\n" : "failed\n");
	}
}

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CommitProp
Linus Torvalds
201
67.45%
2
20.00%
Al Viro
41
13.76%
3
30.00%
Lucas De Marchi
22
7.38%
1
10.00%
Rafael J. Wysocki
14
4.70%
1
10.00%
Jay Lan
13
4.36%
1
10.00%
Tejun Heo
4
1.34%
1
10.00%
Andrew Morton
3
1.01%
1
10.00%
Total
298
100.00%
10
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) {
			sys_unlink("/initrd.image");
			handle_initrd();
			return true;
		}
	}
	sys_unlink("/initrd.image");
	return false;
}
Contributors
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CommitProp
Linus Torvalds
36
66.67%
1
25.00%
Andrew Morton
12
22.22%
1
25.00%
Yaowei Bai
3
5.56%
1
25.00%
Al Viro
3
5.56%
1
25.00%
Total
54
100.00%
4
100.00%

Overall Contributors
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Tokens
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CommitProp
Linus Torvalds
310
60.43%
2
11.76%
Al Viro
102
19.88%
5
29.41%
Andrew Morton
27
5.26%
2
11.76%
Lucas De Marchi
22
4.29%
1
5.88%
Rafael J. Wysocki
14
2.73%
1
5.88%
Jay Lan
13
2.53%
1
5.88%
H Hartley Sweeten
12
2.34%
1
5.88%
Tejun Heo
4
0.78%
1
5.88%
Nigel Cunningham
3
0.58%
1
5.88%
Yaowei Bai
3
0.58%
1
5.88%
Adrian Bunk
3
0.58%
1
5.88%
Total
513
100.00%
17
100.00%
Directory: init

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