Commit | Line | Data |
---|---|---|
c67e5382 HS |
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 | ||
1da177e4 LT |
11 | #include <linux/unistd.h> |
12 | #include <linux/kernel.h> | |
13 | #include <linux/fs.h> | |
14 | #include <linux/minix_fs.h> | |
1da177e4 LT |
15 | #include <linux/romfs_fs.h> |
16 | #include <linux/initrd.h> | |
17 | #include <linux/sched.h> | |
7dfb7103 | 18 | #include <linux/freezer.h> |
1da177e4 LT |
19 | |
20 | #include "do_mounts.h" | |
21 | ||
22 | unsigned long initrd_start, initrd_end; | |
23 | int initrd_below_start_ok; | |
24 | unsigned int real_root_dev; /* do_proc_dointvec cannot handle kdev_t */ | |
25 | static int __initdata old_fd, root_fd; | |
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 | ||
d7627467 | 36 | static int __init do_linuxrc(void *_shell) |
1da177e4 | 37 | { |
d7627467 DH |
38 | static const char *argv[] = { "linuxrc", NULL, }; |
39 | extern const char *envp_init[]; | |
40 | const char *shell = _shell; | |
1da177e4 LT |
41 | |
42 | sys_close(old_fd);sys_close(root_fd); | |
1da177e4 | 43 | sys_setsid(); |
67608567 | 44 | return kernel_execve(shell, argv, envp_init); |
1da177e4 LT |
45 | } |
46 | ||
47 | static void __init handle_initrd(void) | |
48 | { | |
49 | int error; | |
29a1d2d1 | 50 | int pid; |
1da177e4 LT |
51 | |
52 | real_root_dev = new_encode_dev(ROOT_DEV); | |
bdaf8529 | 53 | create_dev("/dev/root.old", Root_RAM0); |
1da177e4 LT |
54 | /* mount initrd on rootfs' /root */ |
55 | mount_block_root("/dev/root.old", root_mountflags & ~MS_RDONLY); | |
56 | sys_mkdir("/old", 0700); | |
57 | root_fd = sys_open("/", 0, 0); | |
58 | old_fd = sys_open("/old", 0, 0); | |
59 | /* move initrd over / and chdir/chroot in initrd root */ | |
60 | sys_chdir("/root"); | |
61 | sys_mount(".", "/", NULL, MS_MOVE, NULL); | |
62 | sys_chroot("."); | |
1da177e4 | 63 | |
8baabde6 RW |
64 | /* |
65 | * In case that a resume from disk is carried out by linuxrc or one of | |
66 | * its children, we need to tell the freezer not to wait for us. | |
67 | */ | |
68 | current->flags |= PF_FREEZER_SKIP; | |
69 | ||
1da177e4 | 70 | pid = kernel_thread(do_linuxrc, "/linuxrc", SIGCHLD); |
83144186 | 71 | if (pid > 0) |
8baabde6 | 72 | while (pid != sys_wait4(-1, NULL, 0, NULL)) |
1da177e4 | 73 | yield(); |
8baabde6 RW |
74 | |
75 | current->flags &= ~PF_FREEZER_SKIP; | |
1da177e4 LT |
76 | |
77 | /* move initrd to rootfs' /old */ | |
78 | sys_fchdir(old_fd); | |
79 | sys_mount("/", ".", NULL, MS_MOVE, NULL); | |
80 | /* switch root and cwd back to / of rootfs */ | |
81 | sys_fchdir(root_fd); | |
82 | sys_chroot("."); | |
83 | sys_close(old_fd); | |
84 | sys_close(root_fd); | |
1da177e4 LT |
85 | |
86 | if (new_decode_dev(real_root_dev) == Root_RAM0) { | |
87 | sys_chdir("/old"); | |
88 | return; | |
89 | } | |
90 | ||
91 | ROOT_DEV = new_decode_dev(real_root_dev); | |
92 | mount_root(); | |
93 | ||
94 | printk(KERN_NOTICE "Trying to move old root to /initrd ... "); | |
95 | error = sys_mount("/old", "/root/initrd", NULL, MS_MOVE, NULL); | |
96 | if (!error) | |
97 | printk("okay\n"); | |
98 | else { | |
99 | int fd = sys_open("/dev/root.old", O_RDWR, 0); | |
f220ab2a JL |
100 | if (error == -ENOENT) |
101 | printk("/initrd does not exist. Ignored.\n"); | |
102 | else | |
103 | printk("failed\n"); | |
1da177e4 LT |
104 | printk(KERN_NOTICE "Unmounting old root\n"); |
105 | sys_umount("/old", MNT_DETACH); | |
106 | printk(KERN_NOTICE "Trying to free ramdisk memory ... "); | |
107 | if (fd < 0) { | |
108 | error = fd; | |
109 | } else { | |
110 | error = sys_ioctl(fd, BLKFLSBUF, 0); | |
111 | sys_close(fd); | |
112 | } | |
113 | printk(!error ? "okay\n" : "failed\n"); | |
114 | } | |
115 | } | |
116 | ||
117 | int __init initrd_load(void) | |
118 | { | |
119 | if (mount_initrd) { | |
bdaf8529 | 120 | create_dev("/dev/ram", Root_RAM0); |
1da177e4 LT |
121 | /* |
122 | * Load the initrd data into /dev/ram0. Execute it as initrd | |
123 | * unless /dev/ram0 is supposed to be our actual root device, | |
124 | * in that case the ram disk is just set up here, and gets | |
125 | * mounted in the normal path. | |
126 | */ | |
127 | if (rd_load_image("/initrd.image") && ROOT_DEV != Root_RAM0) { | |
128 | sys_unlink("/initrd.image"); | |
129 | handle_initrd(); | |
130 | return 1; | |
131 | } | |
132 | } | |
133 | sys_unlink("/initrd.image"); | |
134 | return 0; | |
135 | } |