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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
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 const char *argv[] = { "linuxrc", NULL, };
30 extern const char *envp_init[];
31 const char *shell = _shell;
32
33 sys_close(old_fd);sys_close(root_fd);
34 sys_setsid();
35 return kernel_execve(shell, argv, envp_init);
36}
37
38static void __init handle_initrd(void)
39{
40 int error;
41 int pid;
42
43 real_root_dev = new_encode_dev(ROOT_DEV);
44 create_dev("/dev/root.old", Root_RAM0);
45 /* mount initrd on rootfs' /root */
46 mount_block_root("/dev/root.old", root_mountflags & ~MS_RDONLY);
47 sys_mkdir("/old", 0700);
48 root_fd = sys_open("/", 0, 0);
49 old_fd = sys_open("/old", 0, 0);
50 /* move initrd over / and chdir/chroot in initrd root */
51 sys_chdir("/root");
52 sys_mount(".", "/", NULL, MS_MOVE, NULL);
53 sys_chroot(".");
54
55 /*
56 * In case that a resume from disk is carried out by linuxrc or one of
57 * its children, we need to tell the freezer not to wait for us.
58 */
59 current->flags |= PF_FREEZER_SKIP;
60
61 pid = kernel_thread(do_linuxrc, "/linuxrc", SIGCHLD);
62 if (pid > 0)
63 while (pid != sys_wait4(-1, NULL, 0, NULL))
64 yield();
65
66 current->flags &= ~PF_FREEZER_SKIP;
67
68 /* move initrd to rootfs' /old */
69 sys_fchdir(old_fd);
70 sys_mount("/", ".", NULL, MS_MOVE, NULL);
71 /* switch root and cwd back to / of rootfs */
72 sys_fchdir(root_fd);
73 sys_chroot(".");
74 sys_close(old_fd);
75 sys_close(root_fd);
76
77 if (new_decode_dev(real_root_dev) == Root_RAM0) {
78 sys_chdir("/old");
79 return;
80 }
81
82 ROOT_DEV = new_decode_dev(real_root_dev);
83 mount_root();
84
85 printk(KERN_NOTICE "Trying to move old root to /initrd ... ");
86 error = sys_mount("/old", "/root/initrd", NULL, MS_MOVE, NULL);
87 if (!error)
88 printk("okay\n");
89 else {
90 int fd = sys_open("/dev/root.old", O_RDWR, 0);
91 if (error == -ENOENT)
92 printk("/initrd does not exist. Ignored.\n");
93 else
94 printk("failed\n");
95 printk(KERN_NOTICE "Unmounting old root\n");
96 sys_umount("/old", MNT_DETACH);
97 printk(KERN_NOTICE "Trying to free ramdisk memory ... ");
98 if (fd < 0) {
99 error = fd;
100 } else {
101 error = sys_ioctl(fd, BLKFLSBUF, 0);
102 sys_close(fd);
103 }
104 printk(!error ? "okay\n" : "failed\n");
105 }
106}
107
108int __init initrd_load(void)
109{
110 if (mount_initrd) {
111 create_dev("/dev/ram", Root_RAM0);
112 /*
113 * Load the initrd data into /dev/ram0. Execute it as initrd
114 * unless /dev/ram0 is supposed to be our actual root device,
115 * in that case the ram disk is just set up here, and gets
116 * mounted in the normal path.
117 */
118 if (rd_load_image("/initrd.image") && ROOT_DEV != Root_RAM0) {
119 sys_unlink("/initrd.image");
120 handle_initrd();
121 return 1;
122 }
123 }
124 sys_unlink("/initrd.image");
125 return 0;
126}
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
20#include "do_mounts.h"
21
22unsigned long initrd_start, initrd_end;
23int initrd_below_start_ok;
24unsigned int real_root_dev; /* do_proc_dointvec cannot handle kdev_t */
25static int __initdata old_fd, root_fd;
26static int __initdata mount_initrd = 1;
27
28static int __init no_initrd(char *str)
29{
30 mount_initrd = 0;
31 return 1;
32}
33
34__setup("noinitrd", no_initrd);
35
36static int __init do_linuxrc(void *_shell)
37{
38 static const char *argv[] = { "linuxrc", NULL, };
39 extern const char *envp_init[];
40 const char *shell = _shell;
41
42 sys_close(old_fd);sys_close(root_fd);
43 sys_setsid();
44 return kernel_execve(shell, argv, envp_init);
45}
46
47static void __init handle_initrd(void)
48{
49 int error;
50 int pid;
51
52 real_root_dev = new_encode_dev(ROOT_DEV);
53 create_dev("/dev/root.old", Root_RAM0);
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(".");
63
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
70 pid = kernel_thread(do_linuxrc, "/linuxrc", SIGCHLD);
71 if (pid > 0)
72 while (pid != sys_wait4(-1, NULL, 0, NULL))
73 yield();
74
75 current->flags &= ~PF_FREEZER_SKIP;
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);
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);
100 if (error == -ENOENT)
101 printk("/initrd does not exist. Ignored.\n");
102 else
103 printk("failed\n");
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
117int __init initrd_load(void)
118{
119 if (mount_initrd) {
120 create_dev("/dev/ram", Root_RAM0);
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}