Contents of /alx-src/tags/kernel26-2.6.12-alx-r9/init/do_mounts_initrd.c
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Wed Mar 4 11:03:09 2009 UTC (15 years, 6 months ago) by niro
File MIME type: text/plain
File size: 3012 byte(s)
Wed Mar 4 11:03:09 2009 UTC (15 years, 6 months ago) by niro
File MIME type: text/plain
File size: 3012 byte(s)
Tag kernel26-2.6.12-alx-r9
1 | #define __KERNEL_SYSCALLS__ |
2 | #include <linux/unistd.h> |
3 | #include <linux/kernel.h> |
4 | #include <linux/fs.h> |
5 | #include <linux/minix_fs.h> |
6 | #include <linux/ext2_fs.h> |
7 | #include <linux/romfs_fs.h> |
8 | #include <linux/initrd.h> |
9 | #include <linux/sched.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_close(0);sys_close(1);sys_close(2); |
34 | sys_setsid(); |
35 | (void) sys_open("/dev/console",O_RDWR,0); |
36 | (void) sys_dup(0); |
37 | (void) sys_dup(0); |
38 | return execve(shell, argv, envp_init); |
39 | } |
40 | |
41 | static void __init handle_initrd(void) |
42 | { |
43 | int error; |
44 | int i, pid; |
45 | |
46 | real_root_dev = new_encode_dev(ROOT_DEV); |
47 | create_dev("/dev/root.old", Root_RAM0, NULL); |
48 | /* mount initrd on rootfs' /root */ |
49 | mount_block_root("/dev/root.old", root_mountflags & ~MS_RDONLY); |
50 | sys_mkdir("/old", 0700); |
51 | root_fd = sys_open("/", 0, 0); |
52 | old_fd = sys_open("/old", 0, 0); |
53 | /* move initrd over / and chdir/chroot in initrd root */ |
54 | sys_chdir("/root"); |
55 | sys_mount(".", "/", NULL, MS_MOVE, NULL); |
56 | sys_chroot("."); |
57 | mount_devfs_fs (); |
58 | |
59 | pid = kernel_thread(do_linuxrc, "/linuxrc", SIGCHLD); |
60 | if (pid > 0) { |
61 | while (pid != sys_wait4(-1, &i, 0, NULL)) |
62 | yield(); |
63 | } |
64 | |
65 | /* move initrd to rootfs' /old */ |
66 | sys_fchdir(old_fd); |
67 | sys_mount("/", ".", NULL, MS_MOVE, NULL); |
68 | /* switch root and cwd back to / of rootfs */ |
69 | sys_fchdir(root_fd); |
70 | sys_chroot("."); |
71 | sys_close(old_fd); |
72 | sys_close(root_fd); |
73 | umount_devfs("/old/dev"); |
74 | |
75 | if (new_decode_dev(real_root_dev) == Root_RAM0) { |
76 | sys_chdir("/old"); |
77 | return; |
78 | } |
79 | |
80 | ROOT_DEV = new_decode_dev(real_root_dev); |
81 | mount_root(); |
82 | |
83 | printk(KERN_NOTICE "Trying to move old root to /initrd ... "); |
84 | error = sys_mount("/old", "/root/initrd", NULL, MS_MOVE, NULL); |
85 | if (!error) |
86 | printk("okay\n"); |
87 | else { |
88 | int fd = sys_open("/dev/root.old", O_RDWR, 0); |
89 | printk("failed\n"); |
90 | printk(KERN_NOTICE "Unmounting old root\n"); |
91 | sys_umount("/old", MNT_DETACH); |
92 | printk(KERN_NOTICE "Trying to free ramdisk memory ... "); |
93 | if (fd < 0) { |
94 | error = fd; |
95 | } else { |
96 | error = sys_ioctl(fd, BLKFLSBUF, 0); |
97 | sys_close(fd); |
98 | } |
99 | printk(!error ? "okay\n" : "failed\n"); |
100 | } |
101 | } |
102 | |
103 | int __init initrd_load(void) |
104 | { |
105 | if (mount_initrd) { |
106 | create_dev("/dev/ram", Root_RAM0, NULL); |
107 | /* |
108 | * Load the initrd data into /dev/ram0. Execute it as initrd |
109 | * unless /dev/ram0 is supposed to be our actual root device, |
110 | * in that case the ram disk is just set up here, and gets |
111 | * mounted in the normal path. |
112 | */ |
113 | if (rd_load_image("/initrd.image") && ROOT_DEV != Root_RAM0) { |
114 | sys_unlink("/initrd.image"); |
115 | handle_initrd(); |
116 | return 1; |
117 | } |
118 | } |
119 | sys_unlink("/initrd.image"); |
120 | return 0; |
121 | } |