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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 | #include <linux/freezer.h> |
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_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 | } |
126 |
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
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v3.9