1 #include <linux/unistd.h>
2 #include <linux/kernel.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 #include <linux/freezer.h>
11 #include "do_mounts.h"
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;
19 static int __init
no_initrd(char *str
)
25 __setup("noinitrd", no_initrd
);
27 static int __init
do_linuxrc(void *_shell
)
29 static const char *argv
[] = { "linuxrc", NULL
, };
30 extern const char *envp_init
[];
31 const char *shell
= _shell
;
33 sys_close(old_fd
);sys_close(root_fd
);
35 return kernel_execve(shell
, argv
, envp_init
);
38 static void __init
handle_initrd(void)
43 real_root_dev
= new_encode_dev(ROOT_DEV
);
44 create_dev("/dev/root.old", Root_RAM0
);
45 /* mount initrd on rootfs' /root */
46 mount_block_root("/dev/root.old", root_mountflags
& ~MS_RDONLY
);
47 sys_mkdir("/old", 0700);
48 root_fd
= sys_open("/", 0, 0);
49 old_fd
= sys_open("/old", 0, 0);
50 /* move initrd over / and chdir/chroot in initrd root */
52 sys_mount(".", "/", NULL
, MS_MOVE
, NULL
);
56 * In case that a resume from disk is carried out by linuxrc or one of
57 * its children, we need to tell the freezer not to wait for us.
59 current
->flags
|= PF_FREEZER_SKIP
;
61 pid
= kernel_thread(do_linuxrc
, "/linuxrc", SIGCHLD
);
63 while (pid
!= sys_wait4(-1, NULL
, 0, NULL
))
66 current
->flags
&= ~PF_FREEZER_SKIP
;
68 /* move initrd to rootfs' /old */
70 sys_mount("/", ".", NULL
, MS_MOVE
, NULL
);
71 /* switch root and cwd back to / of rootfs */
77 if (new_decode_dev(real_root_dev
) == Root_RAM0
) {
82 ROOT_DEV
= new_decode_dev(real_root_dev
);
85 printk(KERN_NOTICE
"Trying to move old root to /initrd ... ");
86 error
= sys_mount("/old", "/root/initrd", NULL
, MS_MOVE
, NULL
);
90 int fd
= sys_open("/dev/root.old", O_RDWR
, 0);
92 printk("/initrd does not exist. Ignored.\n");
95 printk(KERN_NOTICE
"Unmounting old root\n");
96 sys_umount("/old", MNT_DETACH
);
97 printk(KERN_NOTICE
"Trying to free ramdisk memory ... ");
101 error
= sys_ioctl(fd
, BLKFLSBUF
, 0);
104 printk(!error
? "okay\n" : "failed\n");
108 int __init
initrd_load(void)
111 create_dev("/dev/ram", Root_RAM0
);
113 * Load the initrd data into /dev/ram0. Execute it as initrd
114 * unless /dev/ram0 is supposed to be our actual root device,
115 * in that case the ram disk is just set up here, and gets
116 * mounted in the normal path.
118 if (rd_load_image("/initrd.image") && ROOT_DEV
!= Root_RAM0
) {
119 sys_unlink("/initrd.image");
124 sys_unlink("/initrd.image");
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