2 * Many of the syscalls used in this file expect some of the arguments
3 * to be __user pointers not __kernel pointers. To limit the sparse
4 * noise, turn off sparse checking for this file.
8 #warning "Sparse checking disabled for this file"
11 #include <linux/unistd.h>
12 #include <linux/kernel.h>
14 #include <linux/minix_fs.h>
15 #include <linux/romfs_fs.h>
16 #include <linux/initrd.h>
17 #include <linux/sched.h>
18 #include <linux/freezer.h>
19 #include <linux/kmod.h>
21 #include "do_mounts.h"
23 unsigned long initrd_start, initrd_end;
24 int initrd_below_start_ok;
25 unsigned int real_root_dev; /* do_proc_dointvec cannot handle kdev_t */
26 static int __initdata mount_initrd = 1;
28 static int __init no_initrd(char *str)
34 __setup("noinitrd", no_initrd);
36 static int init_linuxrc(struct subprocess_info *info, struct cred *new)
38 sys_unshare(CLONE_FS | CLONE_FILES);
39 /* stdin/stdout/stderr for /linuxrc */
40 sys_open("/dev/console", O_RDWR, 0);
43 /* move initrd over / and chdir/chroot in initrd root */
45 sys_mount(".", "/", NULL, MS_MOVE, NULL);
51 static void __init handle_initrd(void)
53 static char *argv[] = { "linuxrc", NULL, };
54 extern char *envp_init[];
57 real_root_dev = new_encode_dev(ROOT_DEV);
58 create_dev("/dev/root.old", Root_RAM0);
59 /* mount initrd on rootfs' /root */
60 mount_block_root("/dev/root.old", root_mountflags & ~MS_RDONLY);
61 sys_mkdir("/old", 0700);
65 * In case that a resume from disk is carried out by linuxrc or one of
66 * its children, we need to tell the freezer not to wait for us.
68 current->flags |= PF_FREEZER_SKIP;
70 call_usermodehelper_fns("/linuxrc", argv, envp_init, UMH_WAIT_PROC,
71 init_linuxrc, NULL, NULL);
73 current->flags &= ~PF_FREEZER_SKIP;
75 /* move initrd to rootfs' /old */
76 sys_mount("..", ".", NULL, MS_MOVE, NULL);
77 /* switch root and cwd back to / of rootfs */
80 if (new_decode_dev(real_root_dev) == Root_RAM0) {
86 ROOT_DEV = new_decode_dev(real_root_dev);
89 printk(KERN_NOTICE "Trying to move old root to /initrd ... ");
90 error = sys_mount("/old", "/root/initrd", NULL, MS_MOVE, NULL);
94 int fd = sys_open("/dev/root.old", O_RDWR, 0);
96 printk("/initrd does not exist. Ignored.\n");
99 printk(KERN_NOTICE "Unmounting old root\n");
100 sys_umount("/old", MNT_DETACH);
101 printk(KERN_NOTICE "Trying to free ramdisk memory ... ");
105 error = sys_ioctl(fd, BLKFLSBUF, 0);
108 printk(!error ? "okay\n" : "failed\n");
112 int __init initrd_load(void)
115 create_dev("/dev/ram", Root_RAM0);
117 * Load the initrd data into /dev/ram0. Execute it as initrd
118 * unless /dev/ram0 is supposed to be our actual root device,
119 * in that case the ram disk is just set up here, and gets
120 * mounted in the normal path.
122 if (rd_load_image("/initrd.image") && ROOT_DEV != Root_RAM0) {
123 sys_unlink("/initrd.image");
128 sys_unlink("/initrd.image");