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> |
ba4df280 | 19 | #include <linux/kmod.h> |
1da177e4 LT |
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 */ | |
1da177e4 LT |
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 | ||
ba4df280 | 36 | static int init_linuxrc(struct subprocess_info *info, struct cred *new) |
1da177e4 | 37 | { |
ba4df280 AV |
38 | sys_unshare(CLONE_FS | CLONE_FILES); |
39 | /* move initrd over / and chdir/chroot in initrd root */ | |
40 | sys_chdir("/root"); | |
41 | sys_mount(".", "/", NULL, MS_MOVE, NULL); | |
42 | sys_chroot("."); | |
1da177e4 | 43 | sys_setsid(); |
ba4df280 | 44 | return 0; |
1da177e4 LT |
45 | } |
46 | ||
47 | static void __init handle_initrd(void) | |
48 | { | |
ba4df280 AV |
49 | static char *argv[] = { "linuxrc", NULL, }; |
50 | extern char *envp_init[]; | |
1da177e4 | 51 | int error; |
1da177e4 LT |
52 | |
53 | real_root_dev = new_encode_dev(ROOT_DEV); | |
bdaf8529 | 54 | create_dev("/dev/root.old", Root_RAM0); |
1da177e4 LT |
55 | /* mount initrd on rootfs' /root */ |
56 | mount_block_root("/dev/root.old", root_mountflags & ~MS_RDONLY); | |
57 | sys_mkdir("/old", 0700); | |
ba4df280 | 58 | sys_chdir("/old"); |
1da177e4 | 59 | |
8baabde6 RW |
60 | /* |
61 | * In case that a resume from disk is carried out by linuxrc or one of | |
62 | * its children, we need to tell the freezer not to wait for us. | |
63 | */ | |
64 | current->flags |= PF_FREEZER_SKIP; | |
65 | ||
ba4df280 AV |
66 | call_usermodehelper_fns("/linuxrc", argv, envp_init, UMH_WAIT_PROC, |
67 | init_linuxrc, NULL, NULL); | |
8baabde6 RW |
68 | |
69 | current->flags &= ~PF_FREEZER_SKIP; | |
1da177e4 LT |
70 | |
71 | /* move initrd to rootfs' /old */ | |
ba4df280 | 72 | sys_mount("..", ".", NULL, MS_MOVE, NULL); |
1da177e4 | 73 | /* switch root and cwd back to / of rootfs */ |
ba4df280 | 74 | sys_chroot(".."); |
1da177e4 LT |
75 | |
76 | if (new_decode_dev(real_root_dev) == Root_RAM0) { | |
77 | sys_chdir("/old"); | |
78 | return; | |
79 | } | |
80 | ||
ba4df280 | 81 | sys_chdir("/"); |
1da177e4 LT |
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); | |
f220ab2a JL |
91 | if (error == -ENOENT) |
92 | printk("/initrd does not exist. Ignored.\n"); | |
93 | else | |
94 | printk("failed\n"); | |
1da177e4 LT |
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 | ||
108 | int __init initrd_load(void) | |
109 | { | |
110 | if (mount_initrd) { | |
bdaf8529 | 111 | create_dev("/dev/ram", Root_RAM0); |
1da177e4 LT |
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 | } |