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git.proxmox.com Git - mirror_ubuntu-eoan-kernel.git/blob - init/do_mounts_initrd.c
1 // SPDX-License-Identifier: GPL-2.0
3 * Many of the syscalls used in this file expect some of the arguments
4 * to be __user pointers not __kernel pointers. To limit the sparse
5 * noise, turn off sparse checking for this file.
9 #warning "Sparse checking disabled for this file"
12 #include <linux/unistd.h>
13 #include <linux/kernel.h>
15 #include <linux/minix_fs.h>
16 #include <linux/romfs_fs.h>
17 #include <linux/initrd.h>
18 #include <linux/sched.h>
19 #include <linux/freezer.h>
20 #include <linux/kmod.h>
22 #include "do_mounts.h"
24 unsigned long initrd_start
, initrd_end
;
25 int initrd_below_start_ok
;
26 unsigned int real_root_dev
; /* do_proc_dointvec cannot handle kdev_t */
27 static int __initdata mount_initrd
= 1;
29 static int __init
no_initrd(char *str
)
35 __setup("noinitrd", no_initrd
);
37 static int init_linuxrc(struct subprocess_info
*info
, struct cred
*new)
39 ksys_unshare(CLONE_FS
| CLONE_FILES
);
40 /* stdin/stdout/stderr for /linuxrc */
41 ksys_open("/dev/console", O_RDWR
, 0);
44 /* move initrd over / and chdir/chroot in initrd root */
46 ksys_mount(".", "/", NULL
, MS_MOVE
, NULL
);
52 static void __init
handle_initrd(void)
54 struct subprocess_info
*info
;
55 static char *argv
[] = { "linuxrc", NULL
, };
56 extern char *envp_init
[];
59 real_root_dev
= new_encode_dev(ROOT_DEV
);
60 create_dev("/dev/root.old", Root_RAM0
);
61 /* mount initrd on rootfs' /root */
62 mount_block_root("/dev/root.old", root_mountflags
& ~MS_RDONLY
);
63 ksys_mkdir("/old", 0700);
66 /* try loading default modules from initrd */
67 load_default_modules();
70 * In case that a resume from disk is carried out by linuxrc or one of
71 * its children, we need to tell the freezer not to wait for us.
73 current
->flags
|= PF_FREEZER_SKIP
;
75 info
= call_usermodehelper_setup("/linuxrc", argv
, envp_init
,
76 GFP_KERNEL
, init_linuxrc
, NULL
, NULL
);
79 call_usermodehelper_exec(info
, UMH_WAIT_PROC
);
81 current
->flags
&= ~PF_FREEZER_SKIP
;
83 /* move initrd to rootfs' /old */
84 ksys_mount("..", ".", NULL
, MS_MOVE
, NULL
);
85 /* switch root and cwd back to / of rootfs */
88 if (new_decode_dev(real_root_dev
) == Root_RAM0
) {
94 ROOT_DEV
= new_decode_dev(real_root_dev
);
97 printk(KERN_NOTICE
"Trying to move old root to /initrd ... ");
98 error
= ksys_mount("/old", "/root/initrd", NULL
, MS_MOVE
, NULL
);
102 int fd
= ksys_open("/dev/root.old", O_RDWR
, 0);
103 if (error
== -ENOENT
)
104 printk("/initrd does not exist. Ignored.\n");
107 printk(KERN_NOTICE
"Unmounting old root\n");
108 ksys_umount("/old", MNT_DETACH
);
109 printk(KERN_NOTICE
"Trying to free ramdisk memory ... ");
113 error
= ksys_ioctl(fd
, BLKFLSBUF
, 0);
116 printk(!error
? "okay\n" : "failed\n");
120 bool __init
initrd_load(void)
123 create_dev("/dev/ram", Root_RAM0
);
125 * Load the initrd data into /dev/ram0. Execute it as initrd
126 * unless /dev/ram0 is supposed to be our actual root device,
127 * in that case the ram disk is just set up here, and gets
128 * mounted in the normal path.
130 if (rd_load_image("/initrd.image") && ROOT_DEV
!= Root_RAM0
) {
131 ksys_unlink("/initrd.image");
136 ksys_unlink("/initrd.image");