Commit | Line | Data |
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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> | |
9 | ||
10 | #include "do_mounts.h" | |
11 | ||
12 | unsigned long initrd_start, initrd_end; | |
13 | int initrd_below_start_ok; | |
14 | unsigned int real_root_dev; /* do_proc_dointvec cannot handle kdev_t */ | |
15 | static int __initdata old_fd, root_fd; | |
16 | static int __initdata mount_initrd = 1; | |
17 | ||
18 | static int __init no_initrd(char *str) | |
19 | { | |
20 | mount_initrd = 0; | |
21 | return 1; | |
22 | } | |
23 | ||
24 | __setup("noinitrd", no_initrd); | |
25 | ||
26 | static int __init do_linuxrc(void * shell) | |
27 | { | |
28 | static char *argv[] = { "linuxrc", NULL, }; | |
29 | extern char * envp_init[]; | |
30 | ||
31 | sys_close(old_fd);sys_close(root_fd); | |
32 | sys_close(0);sys_close(1);sys_close(2); | |
33 | sys_setsid(); | |
34 | (void) sys_open("/dev/console",O_RDWR,0); | |
35 | (void) sys_dup(0); | |
36 | (void) sys_dup(0); | |
67608567 | 37 | return kernel_execve(shell, argv, envp_init); |
1da177e4 LT |
38 | } |
39 | ||
40 | static void __init handle_initrd(void) | |
41 | { | |
42 | int error; | |
29a1d2d1 | 43 | int pid; |
1da177e4 LT |
44 | |
45 | real_root_dev = new_encode_dev(ROOT_DEV); | |
bdaf8529 | 46 | create_dev("/dev/root.old", Root_RAM0); |
1da177e4 LT |
47 | /* mount initrd on rootfs' /root */ |
48 | mount_block_root("/dev/root.old", root_mountflags & ~MS_RDONLY); | |
49 | sys_mkdir("/old", 0700); | |
50 | root_fd = sys_open("/", 0, 0); | |
51 | old_fd = sys_open("/old", 0, 0); | |
52 | /* move initrd over / and chdir/chroot in initrd root */ | |
53 | sys_chdir("/root"); | |
54 | sys_mount(".", "/", NULL, MS_MOVE, NULL); | |
55 | sys_chroot("."); | |
1da177e4 | 56 | |
6e1819d6 | 57 | current->flags |= PF_NOFREEZE; |
1da177e4 LT |
58 | pid = kernel_thread(do_linuxrc, "/linuxrc", SIGCHLD); |
59 | if (pid > 0) { | |
29a1d2d1 | 60 | while (pid != sys_wait4(-1, NULL, 0, NULL)) |
1da177e4 LT |
61 | yield(); |
62 | } | |
63 | ||
64 | /* move initrd to rootfs' /old */ | |
65 | sys_fchdir(old_fd); | |
66 | sys_mount("/", ".", NULL, MS_MOVE, NULL); | |
67 | /* switch root and cwd back to / of rootfs */ | |
68 | sys_fchdir(root_fd); | |
69 | sys_chroot("."); | |
70 | sys_close(old_fd); | |
71 | sys_close(root_fd); | |
1da177e4 LT |
72 | |
73 | if (new_decode_dev(real_root_dev) == Root_RAM0) { | |
74 | sys_chdir("/old"); | |
75 | return; | |
76 | } | |
77 | ||
78 | ROOT_DEV = new_decode_dev(real_root_dev); | |
79 | mount_root(); | |
80 | ||
81 | printk(KERN_NOTICE "Trying to move old root to /initrd ... "); | |
82 | error = sys_mount("/old", "/root/initrd", NULL, MS_MOVE, NULL); | |
83 | if (!error) | |
84 | printk("okay\n"); | |
85 | else { | |
86 | int fd = sys_open("/dev/root.old", O_RDWR, 0); | |
f220ab2a JL |
87 | if (error == -ENOENT) |
88 | printk("/initrd does not exist. Ignored.\n"); | |
89 | else | |
90 | printk("failed\n"); | |
1da177e4 LT |
91 | printk(KERN_NOTICE "Unmounting old root\n"); |
92 | sys_umount("/old", MNT_DETACH); | |
93 | printk(KERN_NOTICE "Trying to free ramdisk memory ... "); | |
94 | if (fd < 0) { | |
95 | error = fd; | |
96 | } else { | |
97 | error = sys_ioctl(fd, BLKFLSBUF, 0); | |
98 | sys_close(fd); | |
99 | } | |
100 | printk(!error ? "okay\n" : "failed\n"); | |
101 | } | |
102 | } | |
103 | ||
104 | int __init initrd_load(void) | |
105 | { | |
106 | if (mount_initrd) { | |
bdaf8529 | 107 | create_dev("/dev/ram", Root_RAM0); |
1da177e4 LT |
108 | /* |
109 | * Load the initrd data into /dev/ram0. Execute it as initrd | |
110 | * unless /dev/ram0 is supposed to be our actual root device, | |
111 | * in that case the ram disk is just set up here, and gets | |
112 | * mounted in the normal path. | |
113 | */ | |
114 | if (rd_load_image("/initrd.image") && ROOT_DEV != Root_RAM0) { | |
115 | sys_unlink("/initrd.image"); | |
116 | handle_initrd(); | |
117 | return 1; | |
118 | } | |
119 | } | |
120 | sys_unlink("/initrd.image"); | |
121 | return 0; | |
122 | } |