[net-next-2.6.git] / init / do_mounts_initrd.c

#include <linux/unistd.h>
#include <linux/kernel.h>
#include <linux/fs.h>
#include <linux/minix_fs.h>
#include <linux/ext2_fs.h>
#include <linux/romfs_fs.h>
#include <linux/initrd.h>
#include <linux/sched.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 old_fd, root_fd;
static int __initdata mount_initrd = 1;

static int __init no_initrd(char *str)
{
	mount_initrd = 0;
	return 1;
}

__setup("noinitrd", no_initrd);

static int __init do_linuxrc(void * shell)
{
	static char *argv[] = { "linuxrc", NULL, };
	extern char * envp_init[];

	sys_close(old_fd);sys_close(root_fd);
	sys_close(0);sys_close(1);sys_close(2);
	sys_setsid();
	(void) sys_open("/dev/console",O_RDWR,0);
	(void) sys_dup(0);
	(void) sys_dup(0);
	return kernel_execve(shell, argv, envp_init);
}

static void __init handle_initrd(void)
{
	int error;
	int pid;

	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);
	root_fd = sys_open("/", 0, 0);
	old_fd = sys_open("/old", 0, 0);
	/* move initrd over / and chdir/chroot in initrd root */
	sys_chdir("/root");
	sys_mount(".", "/", NULL, MS_MOVE, NULL);
	sys_chroot(".");

	current->flags |= PF_NOFREEZE;
	pid = kernel_thread(do_linuxrc, "/linuxrc", SIGCHLD);
	if (pid > 0) {
		while (pid != sys_wait4(-1, NULL, 0, NULL))
			yield();
	}

	/* move initrd to rootfs' /old */
	sys_fchdir(old_fd);
	sys_mount("/", ".", NULL, MS_MOVE, NULL);
	/* switch root and cwd back to / of rootfs */
	sys_fchdir(root_fd);
	sys_chroot(".");
	sys_close(old_fd);
	sys_close(root_fd);

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

	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");
	}
}

int __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 1;
		}
	}
	sys_unlink("/initrd.image");
	return 0;
}
Commit	Line	Data
1da177e4 LT	1	#include <linux/unistd.h>
	2	#include <linux/kernel.h>
	3	#include <linux/fs.h>
	4	#include <linux/minix_fs.h>
	5	#include <linux/ext2_fs.h>
	6	#include <linux/romfs_fs.h>
	7	#include <linux/initrd.h>
	8	#include <linux/sched.h>
	9
	10	#include "do_mounts.h"
	11
	12	unsigned long initrd_start, initrd_end;
	13	int initrd_below_start_ok;
	14	unsigned int real_root_dev; /* do_proc_dointvec cannot handle kdev_t */
	15	static int __initdata old_fd, root_fd;
	16	static int __initdata mount_initrd = 1;
	17
	18	static int __init no_initrd(char *str)
	19	{
	20	mount_initrd = 0;
	21	return 1;
	22	}
	23
	24	__setup("noinitrd", no_initrd);
	25
	26	static int __init do_linuxrc(void * shell)
	27	{
	28	static char *argv[] = { "linuxrc", NULL, };
	29	extern char * envp_init[];
	30
	31	sys_close(old_fd);sys_close(root_fd);
	32	sys_close(0);sys_close(1);sys_close(2);
	33	sys_setsid();
	34	(void) sys_open("/dev/console",O_RDWR,0);
	35	(void) sys_dup(0);
	36	(void) sys_dup(0);
67608567	37	return kernel_execve(shell, argv, envp_init);
1da177e4 LT	38	}
	39
	40	static void __init handle_initrd(void)
	41	{
	42	int error;
29a1d2d1	43	int pid;
1da177e4 LT	44
1da177e4 LT	45	real_root_dev = new_encode_dev(ROOT_DEV);
bdaf8529	46	create_dev("/dev/root.old", Root_RAM0);
1da177e4 LT	47	/* mount initrd on rootfs' /root */
	48	mount_block_root("/dev/root.old", root_mountflags & ~MS_RDONLY);
	49	sys_mkdir("/old", 0700);
	50	root_fd = sys_open("/", 0, 0);
	51	old_fd = sys_open("/old", 0, 0);
	52	/* move initrd over / and chdir/chroot in initrd root */
	53	sys_chdir("/root");
	54	sys_mount(".", "/", NULL, MS_MOVE, NULL);
	55	sys_chroot(".");
1da177e4	56
6e1819d6	57	current->flags \|= PF_NOFREEZE;
1da177e4 LT	58	pid = kernel_thread(do_linuxrc, "/linuxrc", SIGCHLD);
1da177e4 LT	59	if (pid > 0) {
29a1d2d1	60	while (pid != sys_wait4(-1, NULL, 0, NULL))
1da177e4 LT	61	yield();
	62	}
	63
	64	/* move initrd to rootfs' /old */
	65	sys_fchdir(old_fd);
	66	sys_mount("/", ".", NULL, MS_MOVE, NULL);
	67	/* switch root and cwd back to / of rootfs */
	68	sys_fchdir(root_fd);
	69	sys_chroot(".");
	70	sys_close(old_fd);
	71	sys_close(root_fd);
1da177e4 LT	72
	73	if (new_decode_dev(real_root_dev) == Root_RAM0) {
	74	sys_chdir("/old");
	75	return;
	76	}
	77
	78	ROOT_DEV = new_decode_dev(real_root_dev);
	79	mount_root();
	80
	81	printk(KERN_NOTICE "Trying to move old root to /initrd ... ");
	82	error = sys_mount("/old", "/root/initrd", NULL, MS_MOVE, NULL);
	83	if (!error)
	84	printk("okay\n");
	85	else {
	86	int fd = sys_open("/dev/root.old", O_RDWR, 0);
f220ab2a JL	87	if (error == -ENOENT)
	88	printk("/initrd does not exist. Ignored.\n");
	89	else
	90	printk("failed\n");
1da177e4 LT	91	printk(KERN_NOTICE "Unmounting old root\n");
	92	sys_umount("/old", MNT_DETACH);
	93	printk(KERN_NOTICE "Trying to free ramdisk memory ... ");
	94	if (fd < 0) {
	95	error = fd;
	96	} else {
	97	error = sys_ioctl(fd, BLKFLSBUF, 0);
	98	sys_close(fd);
	99	}
	100	printk(!error ? "okay\n" : "failed\n");
	101	}
	102	}
	103
	104	int __init initrd_load(void)
	105	{
	106	if (mount_initrd) {
bdaf8529	107	create_dev("/dev/ram", Root_RAM0);
1da177e4 LT	108	/*
	109	* Load the initrd data into /dev/ram0. Execute it as initrd
	110	* unless /dev/ram0 is supposed to be our actual root device,
	111	* in that case the ram disk is just set up here, and gets
	112	* mounted in the normal path.
	113	*/
	114	if (rd_load_image("/initrd.image") && ROOT_DEV != Root_RAM0) {
	115	sys_unlink("/initrd.image");
	116	handle_initrd();
	117	return 1;
	118	}
	119	}
	120	sys_unlink("/initrd.image");
	121	return 0;
	122	}