Commit | Line | Data |
---|---|---|
b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 LT |
2 | #include <linux/unistd.h> |
3 | #include <linux/kernel.h> | |
4 | #include <linux/fs.h> | |
5 | #include <linux/minix_fs.h> | |
1da177e4 LT |
6 | #include <linux/romfs_fs.h> |
7 | #include <linux/initrd.h> | |
8 | #include <linux/sched.h> | |
7dfb7103 | 9 | #include <linux/freezer.h> |
ba4df280 | 10 | #include <linux/kmod.h> |
1da177e4 LT |
11 | |
12 | #include "do_mounts.h" | |
13 | ||
14 | unsigned long initrd_start, initrd_end; | |
15 | int initrd_below_start_ok; | |
16 | unsigned int real_root_dev; /* do_proc_dointvec cannot handle kdev_t */ | |
1da177e4 LT |
17 | static int __initdata mount_initrd = 1; |
18 | ||
b1ab95c6 FF |
19 | phys_addr_t phys_initrd_start __initdata; |
20 | unsigned long phys_initrd_size __initdata; | |
21 | ||
1da177e4 LT |
22 | static int __init no_initrd(char *str) |
23 | { | |
24 | mount_initrd = 0; | |
25 | return 1; | |
26 | } | |
27 | ||
28 | __setup("noinitrd", no_initrd); | |
29 | ||
229c55cc FF |
30 | static int __init early_initrd(char *p) |
31 | { | |
32 | phys_addr_t start; | |
33 | unsigned long size; | |
34 | char *endp; | |
35 | ||
36 | start = memparse(p, &endp); | |
37 | if (*endp == ',') { | |
38 | size = memparse(endp + 1, NULL); | |
39 | ||
40 | phys_initrd_start = start; | |
41 | phys_initrd_size = size; | |
42 | } | |
43 | return 0; | |
44 | } | |
45 | early_param("initrd", early_initrd); | |
46 | ||
ba4df280 | 47 | static int init_linuxrc(struct subprocess_info *info, struct cred *new) |
1da177e4 | 48 | { |
9b32105e | 49 | ksys_unshare(CLONE_FS | CLONE_FILES); |
43b16820 | 50 | /* stdin/stdout/stderr for /linuxrc */ |
bae217ea | 51 | ksys_open("/dev/console", O_RDWR, 0); |
c7248321 DB |
52 | ksys_dup(0); |
53 | ksys_dup(0); | |
ba4df280 | 54 | /* move initrd over / and chdir/chroot in initrd root */ |
447016e9 | 55 | ksys_chdir("/root"); |
312db1aa | 56 | ksys_mount(".", "/", NULL, MS_MOVE, NULL); |
a16fe33a | 57 | ksys_chroot("."); |
e2aaa9f4 | 58 | ksys_setsid(); |
ba4df280 | 59 | return 0; |
1da177e4 LT |
60 | } |
61 | ||
62 | static void __init handle_initrd(void) | |
63 | { | |
907ed132 | 64 | struct subprocess_info *info; |
ba4df280 AV |
65 | static char *argv[] = { "linuxrc", NULL, }; |
66 | extern char *envp_init[]; | |
1da177e4 | 67 | int error; |
1da177e4 LT |
68 | |
69 | real_root_dev = new_encode_dev(ROOT_DEV); | |
bdaf8529 | 70 | create_dev("/dev/root.old", Root_RAM0); |
1da177e4 LT |
71 | /* mount initrd on rootfs' /root */ |
72 | mount_block_root("/dev/root.old", root_mountflags & ~MS_RDONLY); | |
0101db7a | 73 | ksys_mkdir("/old", 0700); |
447016e9 | 74 | ksys_chdir("/old"); |
1da177e4 | 75 | |
8baabde6 RW |
76 | /* |
77 | * In case that a resume from disk is carried out by linuxrc or one of | |
78 | * its children, we need to tell the freezer not to wait for us. | |
79 | */ | |
80 | current->flags |= PF_FREEZER_SKIP; | |
81 | ||
907ed132 LDM |
82 | info = call_usermodehelper_setup("/linuxrc", argv, envp_init, |
83 | GFP_KERNEL, init_linuxrc, NULL, NULL); | |
84 | if (!info) | |
85 | return; | |
86 | call_usermodehelper_exec(info, UMH_WAIT_PROC); | |
8baabde6 RW |
87 | |
88 | current->flags &= ~PF_FREEZER_SKIP; | |
1da177e4 LT |
89 | |
90 | /* move initrd to rootfs' /old */ | |
312db1aa | 91 | ksys_mount("..", ".", NULL, MS_MOVE, NULL); |
1da177e4 | 92 | /* switch root and cwd back to / of rootfs */ |
a16fe33a | 93 | ksys_chroot(".."); |
1da177e4 LT |
94 | |
95 | if (new_decode_dev(real_root_dev) == Root_RAM0) { | |
447016e9 | 96 | ksys_chdir("/old"); |
1da177e4 LT |
97 | return; |
98 | } | |
99 | ||
447016e9 | 100 | ksys_chdir("/"); |
1da177e4 LT |
101 | ROOT_DEV = new_decode_dev(real_root_dev); |
102 | mount_root(); | |
103 | ||
104 | printk(KERN_NOTICE "Trying to move old root to /initrd ... "); | |
312db1aa | 105 | error = ksys_mount("/old", "/root/initrd", NULL, MS_MOVE, NULL); |
1da177e4 LT |
106 | if (!error) |
107 | printk("okay\n"); | |
108 | else { | |
bae217ea | 109 | int fd = ksys_open("/dev/root.old", O_RDWR, 0); |
f220ab2a JL |
110 | if (error == -ENOENT) |
111 | printk("/initrd does not exist. Ignored.\n"); | |
112 | else | |
113 | printk("failed\n"); | |
1da177e4 | 114 | printk(KERN_NOTICE "Unmounting old root\n"); |
3a18ef5c | 115 | ksys_umount("/old", MNT_DETACH); |
1da177e4 LT |
116 | printk(KERN_NOTICE "Trying to free ramdisk memory ... "); |
117 | if (fd < 0) { | |
118 | error = fd; | |
119 | } else { | |
cbb60b92 | 120 | error = ksys_ioctl(fd, BLKFLSBUF, 0); |
2ca2a09d | 121 | ksys_close(fd); |
1da177e4 LT |
122 | } |
123 | printk(!error ? "okay\n" : "failed\n"); | |
124 | } | |
125 | } | |
126 | ||
f057f3b2 | 127 | bool __init initrd_load(void) |
1da177e4 LT |
128 | { |
129 | if (mount_initrd) { | |
bdaf8529 | 130 | create_dev("/dev/ram", Root_RAM0); |
1da177e4 LT |
131 | /* |
132 | * Load the initrd data into /dev/ram0. Execute it as initrd | |
133 | * unless /dev/ram0 is supposed to be our actual root device, | |
134 | * in that case the ram disk is just set up here, and gets | |
135 | * mounted in the normal path. | |
136 | */ | |
137 | if (rd_load_image("/initrd.image") && ROOT_DEV != Root_RAM0) { | |
0f32ab8c | 138 | ksys_unlink("/initrd.image"); |
1da177e4 | 139 | handle_initrd(); |
f057f3b2 | 140 | return true; |
1da177e4 LT |
141 | } |
142 | } | |
0f32ab8c | 143 | ksys_unlink("/initrd.image"); |
f057f3b2 | 144 | return false; |
1da177e4 | 145 | } |