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 | 38 | sys_unshare(CLONE_FS | CLONE_FILES); |
43b16820 AV |
39 | /* stdin/stdout/stderr for /linuxrc */ |
40 | sys_open("/dev/console", O_RDWR, 0); | |
41 | sys_dup(0); | |
42 | sys_dup(0); | |
ba4df280 AV |
43 | /* move initrd over / and chdir/chroot in initrd root */ |
44 | sys_chdir("/root"); | |
45 | sys_mount(".", "/", NULL, MS_MOVE, NULL); | |
46 | sys_chroot("."); | |
1da177e4 | 47 | sys_setsid(); |
ba4df280 | 48 | return 0; |
1da177e4 LT |
49 | } |
50 | ||
51 | static void __init handle_initrd(void) | |
52 | { | |
ba4df280 AV |
53 | static char *argv[] = { "linuxrc", NULL, }; |
54 | extern char *envp_init[]; | |
1da177e4 | 55 | int error; |
1da177e4 LT |
56 | |
57 | real_root_dev = new_encode_dev(ROOT_DEV); | |
bdaf8529 | 58 | create_dev("/dev/root.old", Root_RAM0); |
1da177e4 LT |
59 | /* mount initrd on rootfs' /root */ |
60 | mount_block_root("/dev/root.old", root_mountflags & ~MS_RDONLY); | |
61 | sys_mkdir("/old", 0700); | |
ba4df280 | 62 | sys_chdir("/old"); |
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 | ||
ba4df280 AV |
70 | call_usermodehelper_fns("/linuxrc", argv, envp_init, UMH_WAIT_PROC, |
71 | init_linuxrc, NULL, NULL); | |
8baabde6 RW |
72 | |
73 | current->flags &= ~PF_FREEZER_SKIP; | |
1da177e4 LT |
74 | |
75 | /* move initrd to rootfs' /old */ | |
ba4df280 | 76 | sys_mount("..", ".", NULL, MS_MOVE, NULL); |
1da177e4 | 77 | /* switch root and cwd back to / of rootfs */ |
ba4df280 | 78 | sys_chroot(".."); |
1da177e4 LT |
79 | |
80 | if (new_decode_dev(real_root_dev) == Root_RAM0) { | |
81 | sys_chdir("/old"); | |
82 | return; | |
83 | } | |
84 | ||
ba4df280 | 85 | sys_chdir("/"); |
1da177e4 LT |
86 | ROOT_DEV = new_decode_dev(real_root_dev); |
87 | mount_root(); | |
88 | ||
89 | printk(KERN_NOTICE "Trying to move old root to /initrd ... "); | |
90 | error = sys_mount("/old", "/root/initrd", NULL, MS_MOVE, NULL); | |
91 | if (!error) | |
92 | printk("okay\n"); | |
93 | else { | |
94 | int fd = sys_open("/dev/root.old", O_RDWR, 0); | |
f220ab2a JL |
95 | if (error == -ENOENT) |
96 | printk("/initrd does not exist. Ignored.\n"); | |
97 | else | |
98 | printk("failed\n"); | |
1da177e4 LT |
99 | printk(KERN_NOTICE "Unmounting old root\n"); |
100 | sys_umount("/old", MNT_DETACH); | |
101 | printk(KERN_NOTICE "Trying to free ramdisk memory ... "); | |
102 | if (fd < 0) { | |
103 | error = fd; | |
104 | } else { | |
105 | error = sys_ioctl(fd, BLKFLSBUF, 0); | |
106 | sys_close(fd); | |
107 | } | |
108 | printk(!error ? "okay\n" : "failed\n"); | |
109 | } | |
110 | } | |
111 | ||
112 | int __init initrd_load(void) | |
113 | { | |
114 | if (mount_initrd) { | |
bdaf8529 | 115 | create_dev("/dev/ram", Root_RAM0); |
1da177e4 LT |
116 | /* |
117 | * Load the initrd data into /dev/ram0. Execute it as initrd | |
118 | * unless /dev/ram0 is supposed to be our actual root device, | |
119 | * in that case the ram disk is just set up here, and gets | |
120 | * mounted in the normal path. | |
121 | */ | |
122 | if (rd_load_image("/initrd.image") && ROOT_DEV != Root_RAM0) { | |
123 | sys_unlink("/initrd.image"); | |
124 | handle_initrd(); | |
125 | return 1; | |
126 | } | |
127 | } | |
128 | sys_unlink("/initrd.image"); | |
129 | return 0; | |
130 | } |