Ejemplo n.º 1
0
static void do_mount_root(void)
{
	struct file_system_type * fs_type;
	struct super_block * sb;
	struct vfsmount *vfsmnt;
	struct inode * inode, d_inode;
	struct file filp;
	int retval;
  
#ifdef CONFIG_ROOT_NFS
	if (MAJOR(ROOT_DEV) == UNNAMED_MAJOR)
		if (nfs_root_init(nfs_root_name, nfs_root_addrs) < 0) {
			printk(KERN_ERR "Root-NFS: Unable to contact NFS "
			    "server for root fs, using /dev/fd0 instead\n");
			ROOT_DEV = MKDEV(FLOPPY_MAJOR, 0);
		}
	if (MAJOR(ROOT_DEV) == UNNAMED_MAJOR) {
		ROOT_DEV = 0;
		if ((fs_type = get_fs_type("nfs"))) {
			sb = &super_blocks[0];
			while (sb->s_dev) sb++;
			sb->s_dev = get_unnamed_dev();
			sb->s_flags = root_mountflags & ~MS_RDONLY;
			if (nfs_root_mount(sb) >= 0) {
				inode = sb->s_mounted;
				inode->i_count += 3 ;
				sb->s_covered = inode;
				sb->s_rd_only = 0;
				sb->s_dirt = 0;
				sb->s_type = fs_type;
				current->fs->pwd = inode;
				current->fs->root = inode;
				ROOT_DEV = sb->s_dev;
				printk (KERN_NOTICE "VFS: Mounted root (nfs filesystem).\n");
				vfsmnt = add_vfsmnt(ROOT_DEV, "/dev/root", "/");
				if (!vfsmnt)
					panic("VFS: add_vfsmnt failed for NFS root.\n");
				vfsmnt->mnt_sb = sb;
				vfsmnt->mnt_flags = sb->s_flags;
				return;
			}
			sb->s_dev = 0;
		}
		if (!ROOT_DEV) {
			printk(KERN_ERR "VFS: Unable to mount root fs via NFS, trying floppy.\n");
			ROOT_DEV = MKDEV(FLOPPY_MAJOR, 0);
		}
	}
#endif

#ifdef CONFIG_BLK_DEV_FD
	if (MAJOR(ROOT_DEV) == FLOPPY_MAJOR) {
#ifdef CONFIG_BLK_DEV_INITRD
		extern int rd_doload;
#endif
		floppy_eject();
#ifndef CONFIG_BLK_DEV_RAM
		printk(KERN_NOTICE "(Warning, this kernel has no ramdisk support)\n");
#endif
#ifdef CONFIG_BLK_DEV_INITRD
		/* rd_doload is 2 for a dual initrd/ramload setup */
		if(rd_doload==2)
			rd_load_secondary();
		else
#endif		
		{
			printk(KERN_NOTICE "VFS: Insert root floppy and press ENTER\n");
			wait_for_keypress();
		}
	}
#endif
	printk("VFS: open root device %s\n",
	       kdevname(ROOT_DEV));

	memset(&filp, 0, sizeof(filp));
	memset(&d_inode, 0, sizeof(d_inode));
	d_inode.i_rdev = ROOT_DEV;
	filp.f_inode = &d_inode;
	if ( root_mountflags & MS_RDONLY)
		filp.f_mode = 1; /* read only */
	else
		filp.f_mode = 3; /* read write */
	retval = blkdev_open(&d_inode, &filp);
	if (retval == -EROFS) {
		root_mountflags |= MS_RDONLY;
		filp.f_mode = 1;
		retval = blkdev_open(&d_inode, &filp);
	}
	if (retval)
	        /*
		 * Allow the user to distinguish between failed open
		 * and bad superblock on root device.
		 */
		printk("VFS: Cannot open root device %s\n",
		       kdevname(ROOT_DEV));
	else for (fs_type = file_systems ; fs_type ; fs_type = fs_type->next) {
  		if (!fs_type->requires_dev)
  			continue;
  		sb = read_super(ROOT_DEV,fs_type->name,root_mountflags,NULL,1);
		if (sb) {
			inode = sb->s_mounted;
			inode->i_count += 3 ;	/* NOTE! it is logically used 4 times, not 1 */
			sb->s_covered = inode;
			sb->s_flags = root_mountflags;
			current->fs->pwd = inode;
			current->fs->root = inode;
			printk ("VFS: Mounted root (%s filesystem)%s.\n",
				fs_type->name,
				(sb->s_flags & MS_RDONLY) ? " readonly" : "");
			vfsmnt = add_vfsmnt(ROOT_DEV, "/dev/root", "/");
			if (!vfsmnt)
				panic("VFS: add_vfsmnt failed for root fs");
			vfsmnt->mnt_sb = sb;
			vfsmnt->mnt_flags = root_mountflags;
			return;
		}
	}
	panic("VFS: Unable to mount root fs on %s",
		kdevname(ROOT_DEV));
}
Ejemplo n.º 2
0
void __init mount_root(void)
{
	struct file_system_type * fs_type;
	struct super_block * sb;
	struct vfsmount *vfsmnt;
	struct inode * d_inode = NULL;
	struct file filp;
	int retval;

#ifdef CONFIG_ROOT_NFS
	if (MAJOR(ROOT_DEV) == UNNAMED_MAJOR) {
		ROOT_DEV = 0;
		if ((fs_type = get_fs_type("nfs"))) {
			sb = get_empty_super(); /* "can't fail" */
			sb->s_dev = get_unnamed_dev();
			sb->s_flags = root_mountflags;
			sema_init(&sb->s_vfs_rename_sem,1);
			vfsmnt = add_vfsmnt(sb, "/dev/root", "/");
			if (vfsmnt) {
				if (nfs_root_mount(sb) >= 0) {
					sb->s_dirt = 0;
					sb->s_type = fs_type;
					current->fs->root = dget(sb->s_root);
					current->fs->pwd = dget(sb->s_root);
					ROOT_DEV = sb->s_dev;
			                printk (KERN_NOTICE "VFS: Mounted root (NFS filesystem)%s.\n", (sb->s_flags & MS_RDONLY) ? " readonly" : "");
					return;
				}
				remove_vfsmnt(sb->s_dev);
			}
			put_unnamed_dev(sb->s_dev);
			sb->s_dev = 0;
		}
		if (!ROOT_DEV) {
			printk(KERN_ERR "VFS: Unable to mount root fs via NFS, trying floppy.\n");
			ROOT_DEV = MKDEV(FLOPPY_MAJOR, 0);
		}
	}
#endif

#ifdef CONFIG_BLK_DEV_FD
	if (MAJOR(ROOT_DEV) == FLOPPY_MAJOR) {
#ifdef CONFIG_BLK_DEV_RAM	
		extern int rd_doload;
#endif		
		floppy_eject();
#ifndef CONFIG_BLK_DEV_RAM
		printk(KERN_NOTICE "(Warning, this kernel has no ramdisk support)\n");
#else
		/* rd_doload is 2 for a dual initrd/ramload setup */
		if(rd_doload==2)
			rd_load_secondary();
		else
#endif		
		{
			printk(KERN_NOTICE "VFS: Insert root floppy and press ENTER\n");
			wait_for_keypress();
		}
	}
#endif

	memset(&filp, 0, sizeof(filp));
	d_inode = get_empty_inode();
	d_inode->i_rdev = ROOT_DEV;
	filp.f_dentry = NULL;
	if ( root_mountflags & MS_RDONLY)
		filp.f_mode = 1; /* read only */
	else
		filp.f_mode = 3; /* read write */
	retval = blkdev_open(d_inode, &filp);
	if (retval == -EROFS) {
		root_mountflags |= MS_RDONLY;
		filp.f_mode = 1;
		retval = blkdev_open(d_inode, &filp);
	}
	iput(d_inode);
	if (retval)
	        /*
		 * Allow the user to distinguish between failed open
		 * and bad superblock on root device.
		 */
		printk("VFS: Cannot open root device %s\n",
		       kdevname(ROOT_DEV));
	else for (fs_type = file_systems ; fs_type ; fs_type = fs_type->next) {
  		if (!(fs_type->fs_flags & FS_REQUIRES_DEV))
  			continue;
  		sb = read_super(ROOT_DEV,fs_type->name,root_mountflags,root_mount_data,1);
		if (sb) {
			sb->s_flags = root_mountflags;
			current->fs->root = dget(sb->s_root);
			current->fs->pwd = dget(sb->s_root);
			printk ("VFS: Mounted root (%s filesystem)%s.\n",
				fs_type->name,
				(sb->s_flags & MS_RDONLY) ? " readonly" : "");
			vfsmnt = add_vfsmnt(sb, "/dev/root", "/");
			if (vfsmnt)
				return;
			panic("VFS: add_vfsmnt failed for root fs");
		}
	}
#ifdef CONFIG_EMPEG_DISPLAY
	display_bootfail();
#endif
	panic("VFS: Unable to mount root fs on %s",
		kdevname(ROOT_DEV));
}