[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 <linux/freezer.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_setsid();
	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(".");

	/*
	 * 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;

	pid = kernel_thread(do_linuxrc, "/linuxrc", SIGCHLD);
	if (pid > 0)
		while (pid != sys_wait4(-1, NULL, 0, NULL))
			yield();

	current->flags &= ~PF_FREEZER_SKIP;

	/* 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>
7dfb7103	9	#include <linux/freezer.h>
1da177e4 LT	10
	11	#include "do_mounts.h"
	12
	13	unsigned long initrd_start, initrd_end;
	14	int initrd_below_start_ok;
	15	unsigned int real_root_dev; /* do_proc_dointvec cannot handle kdev_t */
	16	static int __initdata old_fd, root_fd;
	17	static int __initdata mount_initrd = 1;
	18
	19	static int __init no_initrd(char *str)
	20	{
	21	mount_initrd = 0;
	22	return 1;
	23	}
	24
	25	__setup("noinitrd", no_initrd);
	26
	27	static int __init do_linuxrc(void * shell)
	28	{
	29	static char *argv[] = { "linuxrc", NULL, };
	30	extern char * envp_init[];
	31
	32	sys_close(old_fd);sys_close(root_fd);
1da177e4	33	sys_setsid();
67608567	34	return kernel_execve(shell, argv, envp_init);
1da177e4 LT	35	}
	36
	37	static void __init handle_initrd(void)
	38	{
	39	int error;
29a1d2d1	40	int pid;
1da177e4 LT	41
1da177e4 LT	42	real_root_dev = new_encode_dev(ROOT_DEV);
bdaf8529	43	create_dev("/dev/root.old", Root_RAM0);
1da177e4 LT	44	/* mount initrd on rootfs' /root */
	45	mount_block_root("/dev/root.old", root_mountflags & ~MS_RDONLY);
	46	sys_mkdir("/old", 0700);
	47	root_fd = sys_open("/", 0, 0);
	48	old_fd = sys_open("/old", 0, 0);
	49	/* move initrd over / and chdir/chroot in initrd root */
	50	sys_chdir("/root");
	51	sys_mount(".", "/", NULL, MS_MOVE, NULL);
	52	sys_chroot(".");
1da177e4	53
8baabde6 RW	54	/*
	55	* In case that a resume from disk is carried out by linuxrc or one of
	56	* its children, we need to tell the freezer not to wait for us.
	57	*/
	58	current->flags \|= PF_FREEZER_SKIP;
	59
1da177e4	60	pid = kernel_thread(do_linuxrc, "/linuxrc", SIGCHLD);
83144186	61	if (pid > 0)
8baabde6	62	while (pid != sys_wait4(-1, NULL, 0, NULL))
1da177e4	63	yield();
8baabde6 RW	64
8baabde6 RW	65	current->flags &= ~PF_FREEZER_SKIP;
1da177e4 LT	66
	67	/* move initrd to rootfs' /old */
	68	sys_fchdir(old_fd);
	69	sys_mount("/", ".", NULL, MS_MOVE, NULL);
	70	/* switch root and cwd back to / of rootfs */
	71	sys_fchdir(root_fd);
	72	sys_chroot(".");
	73	sys_close(old_fd);
	74	sys_close(root_fd);
1da177e4 LT	75
	76	if (new_decode_dev(real_root_dev) == Root_RAM0) {
	77	sys_chdir("/old");
	78	return;
	79	}
	80
	81	ROOT_DEV = new_decode_dev(real_root_dev);
	82	mount_root();
	83
	84	printk(KERN_NOTICE "Trying to move old root to /initrd ... ");
	85	error = sys_mount("/old", "/root/initrd", NULL, MS_MOVE, NULL);
	86	if (!error)
	87	printk("okay\n");
	88	else {
	89	int fd = sys_open("/dev/root.old", O_RDWR, 0);
f220ab2a JL	90	if (error == -ENOENT)
	91	printk("/initrd does not exist. Ignored.\n");
	92	else
	93	printk("failed\n");
1da177e4 LT	94	printk(KERN_NOTICE "Unmounting old root\n");
	95	sys_umount("/old", MNT_DETACH);
	96	printk(KERN_NOTICE "Trying to free ramdisk memory ... ");
	97	if (fd < 0) {
	98	error = fd;
	99	} else {
	100	error = sys_ioctl(fd, BLKFLSBUF, 0);
	101	sys_close(fd);
	102	}
	103	printk(!error ? "okay\n" : "failed\n");
	104	}
	105	}
	106
	107	int __init initrd_load(void)
	108	{
	109	if (mount_initrd) {
bdaf8529	110	create_dev("/dev/ram", Root_RAM0);
1da177e4 LT	111	/*
	112	* Load the initrd data into /dev/ram0. Execute it as initrd
	113	* unless /dev/ram0 is supposed to be our actual root device,
	114	* in that case the ram disk is just set up here, and gets
	115	* mounted in the normal path.
	116	*/
	117	if (rd_load_image("/initrd.image") && ROOT_DEV != Root_RAM0) {
	118	sys_unlink("/initrd.image");
	119	handle_initrd();
	120	return 1;
	121	}
	122	}
	123	sys_unlink("/initrd.image");
	124	return 0;
	125	}