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137 lines
3.4 KiB
137 lines
3.4 KiB
/* |
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* Many of the syscalls used in this file expect some of the arguments |
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* to be __user pointers not __kernel pointers. To limit the sparse |
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* noise, turn off sparse checking for this file. |
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*/ |
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#ifdef __CHECKER__ |
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#undef __CHECKER__ |
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#warning "Sparse checking disabled for this file" |
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#endif |
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#include <linux/unistd.h> |
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#include <linux/kernel.h> |
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#include <linux/fs.h> |
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#include <linux/minix_fs.h> |
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#include <linux/romfs_fs.h> |
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#include <linux/initrd.h> |
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#include <linux/sched.h> |
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#include <linux/freezer.h> |
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#include <linux/kmod.h> |
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#include "do_mounts.h" |
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unsigned long initrd_start, initrd_end; |
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int initrd_below_start_ok; |
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unsigned int real_root_dev; /* do_proc_dointvec cannot handle kdev_t */ |
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static int __initdata mount_initrd = 1; |
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static int __init no_initrd(char *str) |
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{ |
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mount_initrd = 0; |
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return 1; |
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} |
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__setup("noinitrd", no_initrd); |
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static int init_linuxrc(struct subprocess_info *info, struct cred *new) |
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{ |
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sys_unshare(CLONE_FS | CLONE_FILES); |
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/* stdin/stdout/stderr for /linuxrc */ |
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sys_open("/dev/console", O_RDWR, 0); |
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sys_dup(0); |
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sys_dup(0); |
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/* move initrd over / and chdir/chroot in initrd root */ |
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sys_chdir("/root"); |
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sys_mount(".", "/", NULL, MS_MOVE, NULL); |
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sys_chroot("."); |
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sys_setsid(); |
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return 0; |
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} |
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static void __init handle_initrd(void) |
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{ |
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struct subprocess_info *info; |
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static char *argv[] = { "linuxrc", NULL, }; |
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extern char *envp_init[]; |
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int error; |
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real_root_dev = new_encode_dev(ROOT_DEV); |
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create_dev("/dev/root.old", Root_RAM0); |
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/* mount initrd on rootfs' /root */ |
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mount_block_root("/dev/root.old", root_mountflags & ~MS_RDONLY); |
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sys_mkdir("/old", 0700); |
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sys_chdir("/old"); |
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/* try loading default modules from initrd */ |
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load_default_modules(); |
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/* |
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* In case that a resume from disk is carried out by linuxrc or one of |
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* its children, we need to tell the freezer not to wait for us. |
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*/ |
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current->flags |= PF_FREEZER_SKIP; |
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info = call_usermodehelper_setup("/linuxrc", argv, envp_init, |
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GFP_KERNEL, init_linuxrc, NULL, NULL); |
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if (!info) |
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return; |
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call_usermodehelper_exec(info, UMH_WAIT_PROC); |
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current->flags &= ~PF_FREEZER_SKIP; |
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/* move initrd to rootfs' /old */ |
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sys_mount("..", ".", NULL, MS_MOVE, NULL); |
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/* switch root and cwd back to / of rootfs */ |
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sys_chroot(".."); |
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if (new_decode_dev(real_root_dev) == Root_RAM0) { |
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sys_chdir("/old"); |
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return; |
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} |
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sys_chdir("/"); |
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ROOT_DEV = new_decode_dev(real_root_dev); |
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mount_root(); |
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printk(KERN_NOTICE "Trying to move old root to /initrd ... "); |
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error = sys_mount("/old", "/root/initrd", NULL, MS_MOVE, NULL); |
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if (!error) |
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printk("okay\n"); |
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else { |
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int fd = sys_open("/dev/root.old", O_RDWR, 0); |
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if (error == -ENOENT) |
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printk("/initrd does not exist. Ignored.\n"); |
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else |
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printk("failed\n"); |
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printk(KERN_NOTICE "Unmounting old root\n"); |
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sys_umount("/old", MNT_DETACH); |
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printk(KERN_NOTICE "Trying to free ramdisk memory ... "); |
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if (fd < 0) { |
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error = fd; |
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} else { |
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error = sys_ioctl(fd, BLKFLSBUF, 0); |
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sys_close(fd); |
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} |
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printk(!error ? "okay\n" : "failed\n"); |
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} |
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} |
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int __init initrd_load(void) |
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{ |
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if (mount_initrd) { |
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create_dev("/dev/ram", Root_RAM0); |
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/* |
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* Load the initrd data into /dev/ram0. Execute it as initrd |
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* unless /dev/ram0 is supposed to be our actual root device, |
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* in that case the ram disk is just set up here, and gets |
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* mounted in the normal path. |
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*/ |
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if (rd_load_image("/initrd.image") && ROOT_DEV != Root_RAM0) { |
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sys_unlink("/initrd.image"); |
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handle_initrd(); |
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return 1; |
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} |
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} |
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sys_unlink("/initrd.image"); |
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return 0; |
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}
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