Exemple #1
0
static int __init mount_nfs_root(void)
{
	char *root_dev, *root_data;
	unsigned int timeout;
	int try, err;

	err = nfs_root_data(&root_dev, &root_data);
	if (err != 0)
		return 0;

	/*
	 * The server or network may not be ready, so try several
	 * times.  Stop after a few tries in case the client wants
	 * to fall back to other boot methods.
	 */
	timeout = NFSROOT_TIMEOUT_MIN;
	for (try = 1; ; try++) {
		err = do_mount_root(root_dev, "nfs",
					root_mountflags, root_data);
		if (err == 0)
			return 1;
		if (try > NFSROOT_RETRY_MAX)
			break;

		/* Wait, in case the server refused us immediately */
		ssleep(timeout);
		timeout <<= 1;
		if (timeout > NFSROOT_TIMEOUT_MAX)
			timeout = NFSROOT_TIMEOUT_MAX;
	}
	return 0;
}
#endif

#if defined(CONFIG_BLK_DEV_RAM) || defined(CONFIG_BLK_DEV_FD)
void __init change_floppy(char *fmt, ...)
{
	struct termios termios;
	char buf[80];
	char c;
	int fd;
	va_list args;
	va_start(args, fmt);
	vsprintf(buf, fmt, args);
	va_end(args);
	fd = sys_open("/dev/root", O_RDWR | O_NDELAY, 0);
	if (fd >= 0) {
		sys_ioctl(fd, FDEJECT, 0);
		sys_close(fd);
	}
	printk(KERN_NOTICE "VFS: Insert %s and press ENTER\n", buf);
	fd = sys_open("/dev/console", O_RDWR, 0);
	if (fd >= 0) {
		sys_ioctl(fd, TCGETS, (long)&termios);
		termios.c_lflag &= ~ICANON;
		sys_ioctl(fd, TCSETSF, (long)&termios);
		sys_read(fd, &c, 1);
		termios.c_lflag |= ICANON;
		sys_ioctl(fd, TCSETSF, (long)&termios);
		sys_close(fd);
	}
}
#endif

void __init mount_root(void)
{
#ifdef CONFIG_ROOT_NFS
	if (ROOT_DEV == Root_NFS) {
		if (mount_nfs_root())
			return;

		printk(KERN_ERR "VFS: Unable to mount root fs via NFS, trying floppy.\n");
		ROOT_DEV = Root_FD0;
	}
#endif
#ifdef CONFIG_BLK_DEV_FD
	if (MAJOR(ROOT_DEV) == FLOPPY_MAJOR) {
		/* rd_doload is 2 for a dual initrd/ramload setup */
		if (rd_doload==2) {
			if (rd_load_disk(1)) {
				ROOT_DEV = Root_RAM1;
				root_device_name = NULL;
			}
		} else
			change_floppy("root floppy");
	}
#endif
#ifdef CONFIG_BLOCK
	{
		int err = create_dev("/dev/root", ROOT_DEV);

		if (err < 0)
			pr_emerg("Failed to create /dev/root: %d\n", err);
		mount_block_root("/dev/root", root_mountflags);
	}
#endif
}

/*
 * Prepare the namespace - decide what/where to mount, load ramdisks, etc.
 */
void __init prepare_namespace(void)
{
	int is_floppy;

	if (root_delay) {
		printk(KERN_INFO "Waiting %d sec before mounting root device...\n",
		       root_delay);
		ssleep(root_delay);
	}

	/*
	 * wait for the known devices to complete their probing
	 *
	 * Note: this is a potential source of long boot delays.
	 * For example, it is not atypical to wait 5 seconds here
	 * for the touchpad of a laptop to initialize.
	 */
	wait_for_device_probe();

	md_run_setup();

	if (saved_root_name[0]) {
		root_device_name = saved_root_name;
		if (!strncmp(root_device_name, "mtd", 3) ||
		    !strncmp(root_device_name, "ubi", 3)) {
			mount_block_root(root_device_name, root_mountflags);
			goto out;
		}
		ROOT_DEV = name_to_dev_t(root_device_name);
		if (strncmp(root_device_name, "/dev/", 5) == 0)
			root_device_name += 5;
	}

	if (initrd_load())
		goto out;

	/* wait for any asynchronous scanning to complete */
	if ((ROOT_DEV == 0) && root_wait) {
		printk(KERN_INFO "Waiting for root device %s...\n",
			saved_root_name);
		while (driver_probe_done() != 0 ||
			(ROOT_DEV = name_to_dev_t(saved_root_name)) == 0)
			msleep(5);
		async_synchronize_full();
	}

	is_floppy = MAJOR(ROOT_DEV) == FLOPPY_MAJOR;

	if (is_floppy && rd_doload && rd_load_disk(0))
		ROOT_DEV = Root_RAM0;

	mount_root();
out:
	devtmpfs_mount("dev");
	sys_mount(".", "/", NULL, MS_MOVE, NULL);
	sys_chroot(".");
}
Exemple #2
0
/* This may be used only once, enforced by 'static int callable' */
int sys_setup(void * BIOS)
{
	static int callable = 1;
	int i,drive;
	unsigned char cmos_disks;
	struct partition *p;
	struct buffer_head * bh;

	if (!callable)
		return -1;
	callable = 0;
#ifndef HD_TYPE
	for (drive=0 ; drive<2 ; drive++) {
		hd_info[drive].cyl = *(unsigned short *) BIOS;
		hd_info[drive].head = *(unsigned char *) (2+BIOS);
		hd_info[drive].wpcom = *(unsigned short *) (5+BIOS);
		hd_info[drive].ctl = *(unsigned char *) (8+BIOS);
		hd_info[drive].lzone = *(unsigned short *) (12+BIOS);
		hd_info[drive].sect = *(unsigned char *) (14+BIOS);
		BIOS += 16;
	}
	if (hd_info[1].cyl)
		NR_HD=2;
	else
		NR_HD=1;
#endif
	for (i=0 ; i<NR_HD ; i++) {
		hd[i*5].start_sect = 0;
		hd[i*5].nr_sects = hd_info[i].head*
				hd_info[i].sect*hd_info[i].cyl;
	}

	/*
		We querry CMOS about hard disks : it could be that 
		we have a SCSI/ESDI/etc controller that is BIOS
		compatable with ST-506, and thus showing up in our
		BIOS table, but not register compatable, and therefore
		not present in CMOS.

		Furthurmore, we will assume that our ST-506 drives
		<if any> are the primary drives in the system, and 
		the ones reflected as drive 1 or 2.

		The first drive is stored in the high nibble of CMOS
		byte 0x12, the second in the low nibble.  This will be
		either a 4 bit drive type or 0xf indicating use byte 0x19 
		for an 8 bit type, drive 1, 0x1a for drive 2 in CMOS.

		Needless to say, a non-zero value means we have 
		an AT controller hard disk for that drive.

		
	*/

	if ((cmos_disks = CMOS_READ(0x12)) & 0xf0)
		if (cmos_disks & 0x0f)
			NR_HD = 2;
		else
			NR_HD = 1;
	else
		NR_HD = 0;
	for (i = NR_HD ; i < 2 ; i++) {
		hd[i*5].start_sect = 0;
		hd[i*5].nr_sects = 0;
	}
	for (drive=0 ; drive<NR_HD ; drive++) {
		if (!(bh = bread(0x300 + drive*5,0))) {
			printk("Unable to read partition table of drive %d\n\r",
				drive);
			panic("");
		}
		if (bh->b_data[510] != 0x55 || (unsigned char)
		    bh->b_data[511] != 0xAA) {
			printk("Bad partition table on drive %d\n\r",drive);
			panic("");
		}
		p = 0x1BE + (void *)bh->b_data;
		for (i=1;i<5;i++,p++) {
			hd[i+5*drive].start_sect = p->start_sect;
			hd[i+5*drive].nr_sects = p->nr_sects;
		}
		brelse(bh);
	}
	if (NR_HD)
		printk("Partition table%s ok.\n\r",(NR_HD>1)?"s":"");
	rd_load();
	mount_root();
	return (0);
}
Exemple #3
0
int __init change_root(kdev_t new_root_dev,const char *put_old)
{
	kdev_t old_root_dev;
	struct vfsmount *vfsmnt;
	struct dentry *old_root,*old_pwd,*dir_d = NULL;
	int error;

	old_root = current->fs->root;
	old_pwd = current->fs->pwd;
	old_root_dev = ROOT_DEV;
	if (!fs_may_mount(new_root_dev)) {
		printk(KERN_CRIT "New root is busy. Staying in initrd.\n");
		return -EBUSY;
	}
	ROOT_DEV = new_root_dev;
	mount_root();
	dput(old_root);
	dput(old_pwd);
#if 1
	shrink_dcache();
	printk("change_root: old root has d_count=%d\n", old_root->d_count);
#endif
	/*
	 * Get the new mount directory
	 */
	dir_d = lookup_dentry(put_old, NULL, 1);
	if (IS_ERR(dir_d)) {
		error = PTR_ERR(dir_d);
	} else if (!dir_d->d_inode) {
		dput(dir_d);
		error = -ENOENT;
	} else {
		error = 0;
	}
	if (!error && dir_d->d_covers != dir_d) {
		dput(dir_d);
		error = -EBUSY;
	}
	if (!error && !S_ISDIR(dir_d->d_inode->i_mode)) {
		dput(dir_d);
		error = -ENOTDIR;
	}
	if (error) {
		int umount_error;

		printk(KERN_NOTICE "Trying to unmount old root ... ");
		umount_error = do_umount(old_root_dev,1, 0);
		if (!umount_error) {
			printk("okay\n");
			/* special: the old device driver is going to be
			   a ramdisk and the point of this call is to free its
			   protected memory (even if dirty). */
			destroy_buffers(old_root_dev);
			return 0;
		}
		printk(KERN_ERR "error %d\n",umount_error);
		return error;
	}
	remove_vfsmnt(old_root_dev);
	vfsmnt = add_vfsmnt(old_root->d_sb, "/dev/root.old", put_old);
	if (vfsmnt) {
		d_mount(dir_d,old_root);
		return 0;
	}
	printk(KERN_CRIT "Trouble: add_vfsmnt failed\n");
	return -ENOMEM;
}
static void __init handle_initrd(void)
{
	int error;
	int pid;

	real_root_dev = new_encode_dev(ROOT_DEV);
	create_dev("/dev/root.old", Root_RAM0);
	/* mount initrd on rootfs' /root */
	mount_block_root("/dev/root.old", root_mountflags & ~MS_RDONLY);
	sys_mkdir((const char __force_user *)"/old", 0700);
	root_fd = sys_open((const char __force_user *)"/", 0, 0);
	old_fd = sys_open((const char __force_user *)"/old", 0, 0);
	/* move initrd over / and chdir/chroot in initrd root */
	sys_chdir((const char __force_user *)"/root");
	sys_mount((char __force_user *)".", (char __force_user *)"/", NULL, MS_MOVE, NULL);
	sys_chroot((const char __force_user *)".");

	/*
	 * In case that a resume from disk is carried out by linuxrc or one of
	 * its children, we need to tell the freezer not to wait for us.
	 */
	current->flags |= PF_FREEZER_SKIP;

	pid = kernel_thread(do_linuxrc, "/linuxrc", SIGCHLD);
	if (pid > 0)
		while (pid != sys_wait4(-1, NULL, 0, NULL))
			yield();

	current->flags &= ~PF_FREEZER_SKIP;

	/* move initrd to rootfs' /old */
	sys_fchdir(old_fd);
	sys_mount((char __force_user *)"/", (char __force_user *)".", NULL, MS_MOVE, NULL);
	/* switch root and cwd back to / of rootfs */
	sys_fchdir(root_fd);
	sys_chroot((const char __force_user *)".");
	sys_close(old_fd);
	sys_close(root_fd);

	if (new_decode_dev(real_root_dev) == Root_RAM0) {
		sys_chdir((const char __force_user *)"/old");
		return;
	}

	ROOT_DEV = new_decode_dev(real_root_dev);
	mount_root();

	printk(KERN_NOTICE "Trying to move old root to /initrd ... ");
	error = sys_mount((char __force_user *)"/old", (char __force_user *)"/root/initrd", NULL, MS_MOVE, NULL);
	if (!error)
		printk("okay\n");
	else {
		int fd = sys_open((const char __force_user *)"/dev/root.old", O_RDWR, 0);
		if (error == -ENOENT)
			printk("/initrd does not exist. Ignored.\n");
		else
			printk("failed\n");
		printk(KERN_NOTICE "Unmounting old root\n");
		sys_umount((char __force_user *)"/old", MNT_DETACH);
		printk(KERN_NOTICE "Trying to free ramdisk memory ... ");
		if (fd < 0) {
			error = fd;
		} else {
			error = sys_ioctl(fd, BLKFLSBUF, 0);
			sys_close(fd);
		}
		printk(!error ? "okay\n" : "failed\n");
	}
}
Exemple #5
0
int main(int argc, char * argv[], char * env[])
{
	char line[128], command[128], pathname[128];
	int ID;
	
	// DEVICE SELECT
	get_device();

	// INITIALIZE 
	init();
	
	// MOUNT ROOT
	mount_root();

	// PROCESS LOOP
	while(1)
	{
		strcpy(line, "");
		strcpy(command, "");
		strcpy(pathname, "");
		strcpy(completePath, "");

		printf("\n\ninput a command (type help for more info): ");
		//read a line containting  command [pathname]; // [ ] means optional
		fgets(line, 256, stdin);
		line[strlen(line)-1] = '\0';

		//Find the command string and call the corresponding function;
		parseString(line, arg1, command, pathname);

		compPath(pathname);
		
		
		printf("PATHNAME: %s\n", pathname);
		ID = findCommand(command);
		switch(ID)
		{
			case -1 : printDir(running->cwd->ino);	break;
			case  0 : _menu  (arg1, pathname);	break;
			case  1 : _ls    (arg1, pathname);	break;
			case  2 : _cd    (arg1, pathname);	break;
			case  3 : _mkdir (arg1, pathname);	break;
			case  4 : _rmdir (arg1, pathname);	break;
			case  5 : _pwd   (arg1, pathname);	break;
			case  6 : _creat0(arg1, pathname);	break;
			case  7 : _rm    (arg1, pathname);	break;
			case  8 : _stat  (arg1, pathname);	break;
			case  9 : compPath(arg1); _link(arg1, pathname); break;
			case  10: _unlink(arg1, pathname); break;
			case  11: compPath(arg1); _symlink(arg1, pathname); break;
			case  12: _touch (arg1, pathname);	break;
			case  13: _chmod (arg1, pathname);	break;
			case  14: _chown (arg1, pathname);	break;
			case  15: _chgrp (arg1, pathname);	break;
			case  16: _open  (arg1, pathname);	break;
			case  17: _close (arg1, pathname);	break;
			case  18: _read  (arg1, pathname);	break;
			case  19: _write (arg1, pathname);	break;
			case  20: _pfd   (arg1, pathname);	break;
			case  21: _lseek (arg1, pathname);	break;
			case  22: _cat   (arg1, pathname);	break;
			case  23: _cp    (arg1, pathname);	break;
			case  24: _mv    (arg1, pathname);	break;
			case  25: __exit (arg1, pathname);	break;
		}
	}
	
	quit();
	return 0;
}