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> |
e262e32d | 11 | #include <uapi/linux/mount.h> |
1da177e4 LT |
12 | |
13 | #include "do_mounts.h" | |
14 | ||
15 | unsigned long initrd_start, initrd_end; | |
16 | int initrd_below_start_ok; | |
17 | unsigned int real_root_dev; /* do_proc_dointvec cannot handle kdev_t */ | |
1da177e4 LT |
18 | static int __initdata mount_initrd = 1; |
19 | ||
b1ab95c6 FF |
20 | phys_addr_t phys_initrd_start __initdata; |
21 | unsigned long phys_initrd_size __initdata; | |
22 | ||
1da177e4 LT |
23 | static int __init no_initrd(char *str) |
24 | { | |
25 | mount_initrd = 0; | |
26 | return 1; | |
27 | } | |
28 | ||
29 | __setup("noinitrd", no_initrd); | |
30 | ||
229c55cc FF |
31 | static int __init early_initrd(char *p) |
32 | { | |
33 | phys_addr_t start; | |
34 | unsigned long size; | |
35 | char *endp; | |
36 | ||
37 | start = memparse(p, &endp); | |
38 | if (*endp == ',') { | |
39 | size = memparse(endp + 1, NULL); | |
40 | ||
41 | phys_initrd_start = start; | |
42 | phys_initrd_size = size; | |
43 | } | |
44 | return 0; | |
45 | } | |
46 | early_param("initrd", early_initrd); | |
47 | ||
ba4df280 | 48 | static int init_linuxrc(struct subprocess_info *info, struct cred *new) |
1da177e4 | 49 | { |
9b32105e | 50 | ksys_unshare(CLONE_FS | CLONE_FILES); |
b49a733d | 51 | console_on_rootfs(); |
ba4df280 | 52 | /* move initrd over / and chdir/chroot in initrd root */ |
447016e9 | 53 | ksys_chdir("/root"); |
d4440aac | 54 | do_mount(".", "/", NULL, MS_MOVE, NULL); |
a16fe33a | 55 | ksys_chroot("."); |
e2aaa9f4 | 56 | ksys_setsid(); |
ba4df280 | 57 | return 0; |
1da177e4 LT |
58 | } |
59 | ||
60 | static void __init handle_initrd(void) | |
61 | { | |
907ed132 | 62 | struct subprocess_info *info; |
ba4df280 AV |
63 | static char *argv[] = { "linuxrc", NULL, }; |
64 | extern char *envp_init[]; | |
1da177e4 | 65 | int error; |
1da177e4 LT |
66 | |
67 | real_root_dev = new_encode_dev(ROOT_DEV); | |
bdaf8529 | 68 | create_dev("/dev/root.old", Root_RAM0); |
1da177e4 LT |
69 | /* mount initrd on rootfs' /root */ |
70 | mount_block_root("/dev/root.old", root_mountflags & ~MS_RDONLY); | |
0101db7a | 71 | ksys_mkdir("/old", 0700); |
447016e9 | 72 | ksys_chdir("/old"); |
1da177e4 | 73 | |
8baabde6 RW |
74 | /* |
75 | * In case that a resume from disk is carried out by linuxrc or one of | |
76 | * its children, we need to tell the freezer not to wait for us. | |
77 | */ | |
78 | current->flags |= PF_FREEZER_SKIP; | |
79 | ||
907ed132 LDM |
80 | info = call_usermodehelper_setup("/linuxrc", argv, envp_init, |
81 | GFP_KERNEL, init_linuxrc, NULL, NULL); | |
82 | if (!info) | |
83 | return; | |
84 | call_usermodehelper_exec(info, UMH_WAIT_PROC); | |
8baabde6 RW |
85 | |
86 | current->flags &= ~PF_FREEZER_SKIP; | |
1da177e4 LT |
87 | |
88 | /* move initrd to rootfs' /old */ | |
d4440aac | 89 | do_mount("..", ".", NULL, MS_MOVE, NULL); |
1da177e4 | 90 | /* switch root and cwd back to / of rootfs */ |
a16fe33a | 91 | ksys_chroot(".."); |
1da177e4 LT |
92 | |
93 | if (new_decode_dev(real_root_dev) == Root_RAM0) { | |
447016e9 | 94 | ksys_chdir("/old"); |
1da177e4 LT |
95 | return; |
96 | } | |
97 | ||
447016e9 | 98 | ksys_chdir("/"); |
1da177e4 LT |
99 | ROOT_DEV = new_decode_dev(real_root_dev); |
100 | mount_root(); | |
101 | ||
102 | printk(KERN_NOTICE "Trying to move old root to /initrd ... "); | |
d4440aac | 103 | error = do_mount("/old", "/root/initrd", NULL, MS_MOVE, NULL); |
1da177e4 LT |
104 | if (!error) |
105 | printk("okay\n"); | |
106 | else { | |
bae217ea | 107 | int fd = ksys_open("/dev/root.old", O_RDWR, 0); |
f220ab2a JL |
108 | if (error == -ENOENT) |
109 | printk("/initrd does not exist. Ignored.\n"); | |
110 | else | |
111 | printk("failed\n"); | |
1da177e4 | 112 | printk(KERN_NOTICE "Unmounting old root\n"); |
3a18ef5c | 113 | ksys_umount("/old", MNT_DETACH); |
1da177e4 LT |
114 | printk(KERN_NOTICE "Trying to free ramdisk memory ... "); |
115 | if (fd < 0) { | |
116 | error = fd; | |
117 | } else { | |
cbb60b92 | 118 | error = ksys_ioctl(fd, BLKFLSBUF, 0); |
2ca2a09d | 119 | ksys_close(fd); |
1da177e4 LT |
120 | } |
121 | printk(!error ? "okay\n" : "failed\n"); | |
122 | } | |
123 | } | |
124 | ||
f057f3b2 | 125 | bool __init initrd_load(void) |
1da177e4 LT |
126 | { |
127 | if (mount_initrd) { | |
bdaf8529 | 128 | create_dev("/dev/ram", Root_RAM0); |
1da177e4 LT |
129 | /* |
130 | * Load the initrd data into /dev/ram0. Execute it as initrd | |
131 | * unless /dev/ram0 is supposed to be our actual root device, | |
132 | * in that case the ram disk is just set up here, and gets | |
133 | * mounted in the normal path. | |
134 | */ | |
135 | if (rd_load_image("/initrd.image") && ROOT_DEV != Root_RAM0) { | |
0f32ab8c | 136 | ksys_unlink("/initrd.image"); |
1da177e4 | 137 | handle_initrd(); |
f057f3b2 | 138 | return true; |
1da177e4 LT |
139 | } |
140 | } | |
0f32ab8c | 141 | ksys_unlink("/initrd.image"); |
f057f3b2 | 142 | return false; |
1da177e4 | 143 | } |