struct super_block {
	struct list_head	s_list;		/* Keep this first */
	kdev_t			s_dev;
	unsigned long		s_blocksize;
	unsigned char		s_blocksize_bits;
	unsigned char		s_dirt;
	unsigned long long	s_maxbytes;	/* Max file size */
	struct file_system_type	*s_type;
	struct super_operations	*s_op;
	struct dquot_operations	*dq_op;
	unsigned long		s_flags;
	unsigned long		s_magic;
	struct dentry		*s_root;
	struct rw_semaphore	s_umount;
	struct semaphore	s_lock;

	struct list_head	s_dirty;	/* dirty inodes */
	struct list_head	s_locked_inodes;/* inodes being synced */
	struct list_head	s_files;

	struct block_device	*s_bdev;
	struct list_head	s_mounts;	/* vfsmount(s) of this one */
	struct quota_mount_options s_dquot;	/* Diskquota specific options */

	union {
		struct minix_sb_info	minix_sb;
		struct ext2_sb_info	ext2_sb;
		struct hpfs_sb_info	hpfs_sb;
		struct ntfs_sb_info	ntfs_sb;
		struct msdos_sb_info	msdos_sb;
		struct isofs_sb_info	isofs_sb;
		struct nfs_sb_info	nfs_sb;
		struct sysv_sb_info	sysv_sb;
		struct affs_sb_info	affs_sb;
		struct ufs_sb_info	ufs_sb;
		struct efs_sb_info	efs_sb;
		struct shmem_sb_info	shmem_sb;
		struct romfs_sb_info	romfs_sb;
		struct smb_sb_info	smbfs_sb;
		struct hfs_sb_info	hfs_sb;
		struct adfs_sb_info	adfs_sb;
		struct qnx4_sb_info	qnx4_sb;
		struct reiserfs_sb_info	reiserfs_sb;
		struct bfs_sb_info	bfs_sb;
		struct udf_sb_info	udf_sb;
		struct ncp_sb_info	ncpfs_sb;
		struct usbdev_sb_info   usbdevfs_sb;
		struct cramfs_sb_info	cramfs_sb;
		void			*generic_sbp;
	} u;
	/*
	 * The next field is for VFS *only*. No filesystems have any business
	 * even looking at it. You had been warned.
	 */
	struct semaphore s_vfs_rename_sem;	/* Kludge */

	/* The next field is used by knfsd when converting a (inode number based)
	 * file handle into a dentry. As it builds a path in the dcache tree from
	 * the bottom up, there may for a time be a subpath of dentrys which is not
	 * connected to the main tree.  This semaphore ensure that there is only ever
	 * one such free path per filesystem.  Note that unconnected files (or other
	 * non-directories) are allowed, but not unconnected diretories.
	 */
	struct semaphore s_nfsd_free_path_sem;
};