]>
git.proxmox.com Git - mirror_ubuntu-artful-kernel.git/blob - init/do_mounts_initrd.c
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>
20 #include "do_mounts.h"
22 unsigned long initrd_start
, initrd_end
;
23 int initrd_below_start_ok
;
24 unsigned int real_root_dev
; /* do_proc_dointvec cannot handle kdev_t */
25 static int __initdata old_fd
, root_fd
;
26 static int __initdata mount_initrd
= 1;
28 static int __init
no_initrd(char *str
)
34 __setup("noinitrd", no_initrd
);
36 static int __init
do_linuxrc(void *_shell
)
38 static const char *argv
[] = { "linuxrc", NULL
, };
39 extern const char *envp_init
[];
40 const char *shell
= _shell
;
42 sys_close(old_fd
);sys_close(root_fd
);
44 return kernel_execve(shell
, argv
, envp_init
);
47 static void __init
handle_initrd(void)
52 real_root_dev
= new_encode_dev(ROOT_DEV
);
53 create_dev("/dev/root.old", Root_RAM0
);
54 /* mount initrd on rootfs' /root */
55 mount_block_root("/dev/root.old", root_mountflags
& ~MS_RDONLY
);
56 sys_mkdir("/old", 0700);
57 root_fd
= sys_open("/", 0, 0);
58 old_fd
= sys_open("/old", 0, 0);
59 /* move initrd over / and chdir/chroot in initrd root */
61 sys_mount(".", "/", NULL
, MS_MOVE
, NULL
);
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 pid
= kernel_thread(do_linuxrc
, "/linuxrc", SIGCHLD
);
72 while (pid
!= sys_wait4(-1, NULL
, 0, NULL
))
75 current
->flags
&= ~PF_FREEZER_SKIP
;
77 /* move initrd to rootfs' /old */
79 sys_mount("/", ".", NULL
, MS_MOVE
, NULL
);
80 /* switch root and cwd back to / of rootfs */
86 if (new_decode_dev(real_root_dev
) == Root_RAM0
) {
91 ROOT_DEV
= new_decode_dev(real_root_dev
);
94 printk(KERN_NOTICE
"Trying to move old root to /initrd ... ");
95 error
= sys_mount("/old", "/root/initrd", NULL
, MS_MOVE
, NULL
);
99 int fd
= sys_open("/dev/root.old", O_RDWR
, 0);
100 if (error
== -ENOENT
)
101 printk("/initrd does not exist. Ignored.\n");
104 printk(KERN_NOTICE
"Unmounting old root\n");
105 sys_umount("/old", MNT_DETACH
);
106 printk(KERN_NOTICE
"Trying to free ramdisk memory ... ");
110 error
= sys_ioctl(fd
, BLKFLSBUF
, 0);
113 printk(!error
? "okay\n" : "failed\n");
117 int __init
initrd_load(void)
120 create_dev("/dev/ram", Root_RAM0
);
122 * Load the initrd data into /dev/ram0. Execute it as initrd
123 * unless /dev/ram0 is supposed to be our actual root device,
124 * in that case the ram disk is just set up here, and gets
125 * mounted in the normal path.
127 if (rd_load_image("/initrd.image") && ROOT_DEV
!= Root_RAM0
) {
128 sys_unlink("/initrd.image");
133 sys_unlink("/initrd.image");