Root/
1 | /* |
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. |
5 | */ |
6 | #ifdef __CHECKER__ |
7 | #undef __CHECKER__ |
8 | #warning "Sparse checking disabled for this file" |
9 | #endif |
10 | |
11 | #include <linux/unistd.h> |
12 | #include <linux/kernel.h> |
13 | #include <linux/fs.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> |
19 | #include <linux/kmod.h> |
20 | |
21 | #include "do_mounts.h" |
22 | |
23 | unsigned long initrd_start, initrd_end; |
24 | int initrd_below_start_ok; |
25 | unsigned int real_root_dev; /* do_proc_dointvec cannot handle kdev_t */ |
26 | static int __initdata mount_initrd = 1; |
27 | |
28 | static int __init no_initrd(char *str) |
29 | { |
30 | mount_initrd = 0; |
31 | return 1; |
32 | } |
33 | |
34 | __setup("noinitrd", no_initrd); |
35 | |
36 | static int init_linuxrc(struct subprocess_info *info, struct cred *new) |
37 | { |
38 | sys_unshare(CLONE_FS | CLONE_FILES); |
39 | /* stdin/stdout/stderr for /linuxrc */ |
40 | sys_open("/dev/console", O_RDWR, 0); |
41 | sys_dup(0); |
42 | sys_dup(0); |
43 | /* move initrd over / and chdir/chroot in initrd root */ |
44 | sys_chdir("/root"); |
45 | sys_mount(".", "/", NULL, MS_MOVE, NULL); |
46 | sys_chroot("."); |
47 | sys_setsid(); |
48 | return 0; |
49 | } |
50 | |
51 | static void __init handle_initrd(void) |
52 | { |
53 | struct subprocess_info *info; |
54 | static char *argv[] = { "linuxrc", NULL, }; |
55 | extern char *envp_init[]; |
56 | int error; |
57 | |
58 | real_root_dev = new_encode_dev(ROOT_DEV); |
59 | create_dev("/dev/root.old", Root_RAM0); |
60 | /* mount initrd on rootfs' /root */ |
61 | mount_block_root("/dev/root.old", root_mountflags & ~MS_RDONLY); |
62 | sys_mkdir("/old", 0700); |
63 | sys_chdir("/old"); |
64 | |
65 | /* try loading default modules from initrd */ |
66 | load_default_modules(); |
67 | |
68 | /* |
69 | * In case that a resume from disk is carried out by linuxrc or one of |
70 | * its children, we need to tell the freezer not to wait for us. |
71 | */ |
72 | current->flags |= PF_FREEZER_SKIP; |
73 | |
74 | info = call_usermodehelper_setup("/linuxrc", argv, envp_init, |
75 | GFP_KERNEL, init_linuxrc, NULL, NULL); |
76 | if (!info) |
77 | return; |
78 | call_usermodehelper_exec(info, UMH_WAIT_PROC); |
79 | |
80 | current->flags &= ~PF_FREEZER_SKIP; |
81 | |
82 | /* move initrd to rootfs' /old */ |
83 | sys_mount("..", ".", NULL, MS_MOVE, NULL); |
84 | /* switch root and cwd back to / of rootfs */ |
85 | sys_chroot(".."); |
86 | |
87 | if (new_decode_dev(real_root_dev) == Root_RAM0) { |
88 | sys_chdir("/old"); |
89 | return; |
90 | } |
91 | |
92 | sys_chdir("/"); |
93 | ROOT_DEV = new_decode_dev(real_root_dev); |
94 | mount_root(); |
95 | |
96 | printk(KERN_NOTICE "Trying to move old root to /initrd ... "); |
97 | error = sys_mount("/old", "/root/initrd", NULL, MS_MOVE, NULL); |
98 | if (!error) |
99 | printk("okay\n"); |
100 | else { |
101 | int fd = sys_open("/dev/root.old", O_RDWR, 0); |
102 | if (error == -ENOENT) |
103 | printk("/initrd does not exist. Ignored.\n"); |
104 | else |
105 | printk("failed\n"); |
106 | printk(KERN_NOTICE "Unmounting old root\n"); |
107 | sys_umount("/old", MNT_DETACH); |
108 | printk(KERN_NOTICE "Trying to free ramdisk memory ... "); |
109 | if (fd < 0) { |
110 | error = fd; |
111 | } else { |
112 | error = sys_ioctl(fd, BLKFLSBUF, 0); |
113 | sys_close(fd); |
114 | } |
115 | printk(!error ? "okay\n" : "failed\n"); |
116 | } |
117 | } |
118 | |
119 | int __init initrd_load(void) |
120 | { |
121 | if (mount_initrd) { |
122 | create_dev("/dev/ram", Root_RAM0); |
123 | /* |
124 | * Load the initrd data into /dev/ram0. Execute it as initrd |
125 | * unless /dev/ram0 is supposed to be our actual root device, |
126 | * in that case the ram disk is just set up here, and gets |
127 | * mounted in the normal path. |
128 | */ |
129 | if (rd_load_image("/initrd.image") && ROOT_DEV != Root_RAM0) { |
130 | sys_unlink("/initrd.image"); |
131 | handle_initrd(); |
132 | return 1; |
133 | } |
134 | } |
135 | sys_unlink("/initrd.image"); |
136 | return 0; |
137 | } |
138 |
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