do_mounts_initrd.c

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    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 
   11 #include <linux/unistd.h>
   12 #include <linux/kernel.h>
   13 #include <linux/fs.h>
   14 #include <linux/minix_fs.h>
   15 #include <linux/romfs_fs.h>
   16 #include <linux/initrd.h>
   17 #include <linux/sched.h>
   18 #include <linux/freezer.h>
   19 #include <linux/kmod.h>
   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 */
   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 
   36 static int init_linuxrc(struct subprocess_info *info, struct cred *new)
   37 {
   38         sys_unshare(CLONE_FS | CLONE_FILES);
   39         /* stdin/stdout/stderr for /linuxrc */
   40         sys_open("/dev/console", O_RDWR, 0);
   41         sys_dup(0);
   42         sys_dup(0);
   43         /* move initrd over / and chdir/chroot in initrd root */
   44         sys_chdir("/root");
   45         sys_mount(".", "/", NULL, MS_MOVE, NULL);
   46         sys_chroot(".");
   47         sys_setsid();
   48         return 0;
   49 }
   50 
   51 static void __init handle_initrd(void)
   52 {
   53         static char *argv[] = { "linuxrc", NULL, };
   54         extern char *envp_init[];
   55         int error;
   56 
   57         real_root_dev = new_encode_dev(ROOT_DEV);
   58         create_dev("/dev/root.old", Root_RAM0);
   59         /* mount initrd on rootfs' /root */
   60         mount_block_root("/dev/root.old", root_mountflags & ~MS_RDONLY);
   61         sys_mkdir("/old", 0700);
   62         sys_chdir("/old");
   63 
   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 
   70         call_usermodehelper_fns("/linuxrc", argv, envp_init, UMH_WAIT_PROC,
   71                         init_linuxrc, NULL, NULL);
   72 
   73         current->flags &= ~PF_FREEZER_SKIP;
   74 
   75         /* move initrd to rootfs' /old */
   76         sys_mount("..", ".", NULL, MS_MOVE, NULL);
   77         /* switch root and cwd back to / of rootfs */
   78         sys_chroot("..");
   79 
   80         if (new_decode_dev(real_root_dev) == Root_RAM0) {
   81                 sys_chdir("/old");
   82                 return;
   83         }
   84 
   85         sys_chdir("/");
   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);
   95                 if (error == -ENOENT)
   96                         printk("/initrd does not exist. Ignored.\n");
   97                 else
   98                         printk("failed\n");
   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) {
  115                 create_dev("/dev/ram", Root_RAM0);
  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 }

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FreeBSD/Linux Kernel Cross Reference sys/init/do_mounts_initrd.c

FreeBSD/Linux Kernel Cross Reference
sys/init/do_mounts_initrd.c