]>
Commit | Line | Data |
---|---|---|
1 | #include <linux/unistd.h> | |
2 | #include <linux/kernel.h> | |
3 | #include <linux/fs.h> | |
4 | #include <linux/minix_fs.h> | |
5 | #include <linux/romfs_fs.h> | |
6 | #include <linux/initrd.h> | |
7 | #include <linux/sched.h> | |
8 | #include <linux/freezer.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 const char *argv[] = { "linuxrc", NULL, }; | |
29 | extern const char *envp_init[]; | |
30 | const char *shell = _shell; | |
31 | ||
32 | sys_close(old_fd);sys_close(root_fd); | |
33 | sys_setsid(); | |
34 | return kernel_execve(shell, argv, envp_init); | |
35 | } | |
36 | ||
37 | static void __init handle_initrd(void) | |
38 | { | |
39 | int error; | |
40 | int pid; | |
41 | ||
42 | real_root_dev = new_encode_dev(ROOT_DEV); | |
43 | create_dev("/dev/root.old", Root_RAM0); | |
44 | /* mount initrd on rootfs' /root */ | |
45 | mount_block_root("/dev/root.old", root_mountflags & ~MS_RDONLY); | |
46 | sys_mkdir("/old", 0700); | |
47 | root_fd = sys_open("/", 0, 0); | |
48 | old_fd = sys_open("/old", 0, 0); | |
49 | /* move initrd over / and chdir/chroot in initrd root */ | |
50 | sys_chdir("/root"); | |
51 | sys_mount(".", "/", NULL, MS_MOVE, NULL); | |
52 | sys_chroot("."); | |
53 | ||
54 | /* | |
55 | * In case that a resume from disk is carried out by linuxrc or one of | |
56 | * its children, we need to tell the freezer not to wait for us. | |
57 | */ | |
58 | current->flags |= PF_FREEZER_SKIP; | |
59 | ||
60 | pid = kernel_thread(do_linuxrc, "/linuxrc", SIGCHLD); | |
61 | if (pid > 0) | |
62 | while (pid != sys_wait4(-1, NULL, 0, NULL)) | |
63 | yield(); | |
64 | ||
65 | current->flags &= ~PF_FREEZER_SKIP; | |
66 | ||
67 | /* move initrd to rootfs' /old */ | |
68 | sys_fchdir(old_fd); | |
69 | sys_mount("/", ".", NULL, MS_MOVE, NULL); | |
70 | /* switch root and cwd back to / of rootfs */ | |
71 | sys_fchdir(root_fd); | |
72 | sys_chroot("."); | |
73 | sys_close(old_fd); | |
74 | sys_close(root_fd); | |
75 | ||
76 | if (new_decode_dev(real_root_dev) == Root_RAM0) { | |
77 | sys_chdir("/old"); | |
78 | return; | |
79 | } | |
80 | ||
81 | ROOT_DEV = new_decode_dev(real_root_dev); | |
82 | mount_root(); | |
83 | ||
84 | printk(KERN_NOTICE "Trying to move old root to /initrd ... "); | |
85 | error = sys_mount("/old", "/root/initrd", NULL, MS_MOVE, NULL); | |
86 | if (!error) | |
87 | printk("okay\n"); | |
88 | else { | |
89 | int fd = sys_open("/dev/root.old", O_RDWR, 0); | |
90 | if (error == -ENOENT) | |
91 | printk("/initrd does not exist. Ignored.\n"); | |
92 | else | |
93 | printk("failed\n"); | |
94 | printk(KERN_NOTICE "Unmounting old root\n"); | |
95 | sys_umount("/old", MNT_DETACH); | |
96 | printk(KERN_NOTICE "Trying to free ramdisk memory ... "); | |
97 | if (fd < 0) { | |
98 | error = fd; | |
99 | } else { | |
100 | error = sys_ioctl(fd, BLKFLSBUF, 0); | |
101 | sys_close(fd); | |
102 | } | |
103 | printk(!error ? "okay\n" : "failed\n"); | |
104 | } | |
105 | } | |
106 | ||
107 | int __init initrd_load(void) | |
108 | { | |
109 | if (mount_initrd) { | |
110 | create_dev("/dev/ram", Root_RAM0); | |
111 | /* | |
112 | * Load the initrd data into /dev/ram0. Execute it as initrd | |
113 | * unless /dev/ram0 is supposed to be our actual root device, | |
114 | * in that case the ram disk is just set up here, and gets | |
115 | * mounted in the normal path. | |
116 | */ | |
117 | if (rd_load_image("/initrd.image") && ROOT_DEV != Root_RAM0) { | |
118 | sys_unlink("/initrd.image"); | |
119 | handle_initrd(); | |
120 | return 1; | |
121 | } | |
122 | } | |
123 | sys_unlink("/initrd.image"); | |
124 | return 0; | |
125 | } |