]>
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); | |
33 | sys_close(0);sys_close(1);sys_close(2); | |
34 | sys_setsid(); | |
35 | (void) sys_open("/dev/console",O_RDWR,0); | |
36 | (void) sys_dup(0); | |
37 | (void) sys_dup(0); | |
67608567 | 38 | return kernel_execve(shell, argv, envp_init); |
1da177e4 LT |
39 | } |
40 | ||
41 | static void __init handle_initrd(void) | |
42 | { | |
43 | int error; | |
29a1d2d1 | 44 | int pid; |
1da177e4 LT |
45 | |
46 | real_root_dev = new_encode_dev(ROOT_DEV); | |
bdaf8529 | 47 | create_dev("/dev/root.old", Root_RAM0); |
1da177e4 LT |
48 | /* mount initrd on rootfs' /root */ |
49 | mount_block_root("/dev/root.old", root_mountflags & ~MS_RDONLY); | |
50 | sys_mkdir("/old", 0700); | |
51 | root_fd = sys_open("/", 0, 0); | |
52 | old_fd = sys_open("/old", 0, 0); | |
53 | /* move initrd over / and chdir/chroot in initrd root */ | |
54 | sys_chdir("/root"); | |
55 | sys_mount(".", "/", NULL, MS_MOVE, NULL); | |
56 | sys_chroot("."); | |
1da177e4 | 57 | |
6e1819d6 | 58 | current->flags |= PF_NOFREEZE; |
1da177e4 LT |
59 | pid = kernel_thread(do_linuxrc, "/linuxrc", SIGCHLD); |
60 | if (pid > 0) { | |
29a1d2d1 | 61 | while (pid != sys_wait4(-1, NULL, 0, NULL)) |
1da177e4 LT |
62 | yield(); |
63 | } | |
64 | ||
65 | /* move initrd to rootfs' /old */ | |
66 | sys_fchdir(old_fd); | |
67 | sys_mount("/", ".", NULL, MS_MOVE, NULL); | |
68 | /* switch root and cwd back to / of rootfs */ | |
69 | sys_fchdir(root_fd); | |
70 | sys_chroot("."); | |
71 | sys_close(old_fd); | |
72 | sys_close(root_fd); | |
1da177e4 LT |
73 | |
74 | if (new_decode_dev(real_root_dev) == Root_RAM0) { | |
75 | sys_chdir("/old"); | |
76 | return; | |
77 | } | |
78 | ||
79 | ROOT_DEV = new_decode_dev(real_root_dev); | |
80 | mount_root(); | |
81 | ||
82 | printk(KERN_NOTICE "Trying to move old root to /initrd ... "); | |
83 | error = sys_mount("/old", "/root/initrd", NULL, MS_MOVE, NULL); | |
84 | if (!error) | |
85 | printk("okay\n"); | |
86 | else { | |
87 | int fd = sys_open("/dev/root.old", O_RDWR, 0); | |
f220ab2a JL |
88 | if (error == -ENOENT) |
89 | printk("/initrd does not exist. Ignored.\n"); | |
90 | else | |
91 | printk("failed\n"); | |
1da177e4 LT |
92 | printk(KERN_NOTICE "Unmounting old root\n"); |
93 | sys_umount("/old", MNT_DETACH); | |
94 | printk(KERN_NOTICE "Trying to free ramdisk memory ... "); | |
95 | if (fd < 0) { | |
96 | error = fd; | |
97 | } else { | |
98 | error = sys_ioctl(fd, BLKFLSBUF, 0); | |
99 | sys_close(fd); | |
100 | } | |
101 | printk(!error ? "okay\n" : "failed\n"); | |
102 | } | |
103 | } | |
104 | ||
105 | int __init initrd_load(void) | |
106 | { | |
107 | if (mount_initrd) { | |
bdaf8529 | 108 | create_dev("/dev/ram", Root_RAM0); |
1da177e4 LT |
109 | /* |
110 | * Load the initrd data into /dev/ram0. Execute it as initrd | |
111 | * unless /dev/ram0 is supposed to be our actual root device, | |
112 | * in that case the ram disk is just set up here, and gets | |
113 | * mounted in the normal path. | |
114 | */ | |
115 | if (rd_load_image("/initrd.image") && ROOT_DEV != Root_RAM0) { | |
116 | sys_unlink("/initrd.image"); | |
117 | handle_initrd(); | |
118 | return 1; | |
119 | } | |
120 | } | |
121 | sys_unlink("/initrd.image"); | |
122 | return 0; | |
123 | } |