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authorLinus Torvalds2005-04-16 17:20:36 -0500
committerLinus Torvalds2005-04-16 17:20:36 -0500
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /init/do_mounts_initrd.c
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Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'init/do_mounts_initrd.c')
-rw-r--r--init/do_mounts_initrd.c121
1 files changed, 121 insertions, 0 deletions
diff --git a/init/do_mounts_initrd.c b/init/do_mounts_initrd.c
new file mode 100644
index 000000000000..07e7d31f2d0b
--- /dev/null
+++ b/init/do_mounts_initrd.c
@@ -0,0 +1,121 @@
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
13unsigned long initrd_start, initrd_end;
14int initrd_below_start_ok;
15unsigned int real_root_dev; /* do_proc_dointvec cannot handle kdev_t */
16static int __initdata old_fd, root_fd;
17static int __initdata mount_initrd = 1;
18
19static int __init no_initrd(char *str)
20{
21 mount_initrd = 0;
22 return 1;
23}
24
25__setup("noinitrd", no_initrd);
26
27static 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
41static 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
103int __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}