#ifndef _NFS_FS_SB
  #define _NFS_FS_SB
  
  #include <linux/list.h>
  #include <linux/backing-dev.h>

  #include <linux/wait.h>

  #include <linux/nfs_xdr.h>
  #include <linux/sunrpc/xprt.h>

  
  #include <asm/atomic.h>

  struct nfs4_session;

  struct nfs_iostats;

  struct nlm_host;

  struct nfs4_sequence_args;
  struct nfs4_sequence_res;
  struct nfs_server;

  struct nfs4_minor_version_ops;

  /*

   * The nfs_client identifies our client state to the server.
   */
  struct nfs_client {
  	atomic_t		cl_count;
  	int			cl_cons_state;	/* current construction state (-ve: init error) */
  #define NFS_CS_READY		0		/* ready to be used */
  #define NFS_CS_INITING		1		/* busy initialising */

  #define NFS_CS_SESSION_INITING	2		/* busy initialising  session */

  	unsigned long		cl_res_state;	/* NFS resources state */

  #define NFS_CS_CALLBACK		1		/* - callback started */
  #define NFS_CS_IDMAP		2		/* - idmap started */

  #define NFS_CS_RENEWD		3		/* - renewd started */

  	struct sockaddr_storage	cl_addr;	/* server identifier */
  	size_t			cl_addrlen;

  	char *			cl_hostname;	/* hostname of server */
  	struct list_head	cl_share_link;	/* link in global client list */
  	struct list_head	cl_superblocks;	/* List of nfs_server structs */
  
  	struct rpc_clnt *	cl_rpcclient;

  	const struct nfs_rpc_ops *rpc_ops;	/* NFS protocol vector */

  	int			cl_proto;	/* Network transport protocol */

  	u32			cl_minorversion;/* NFSv4 minorversion */

  	struct rpc_cred		*cl_machine_cred;

  #ifdef CONFIG_NFS_V4
  	u64			cl_clientid;	/* constant */

  	unsigned long		cl_state;

  	struct rb_root		cl_openowner_id;
  	struct rb_root		cl_lockowner_id;

  	struct list_head	cl_delegations;

  	struct rb_root		cl_state_owners;

  	spinlock_t		cl_lock;
  
  	unsigned long		cl_lease_time;
  	unsigned long		cl_last_renewal;

  	struct delayed_work	cl_renewd;

  
  	struct rpc_wait_queue	cl_rpcwaitq;
  
  	/* used for the setclientid verifier */
  	struct timespec		cl_boot_time;
  
  	/* idmapper */
  	struct idmap *		cl_idmap;
  
  	/* Our own IP address, as a null-terminated string.
  	 * This is used to generate the clientid, and the callback address.
  	 */

  	char			cl_ipaddr[48];

  	unsigned char		cl_id_uniquifier;

  	const struct nfs4_minor_version_ops *cl_mvops;

  #endif /* CONFIG_NFS_V4 */

  #ifdef CONFIG_NFS_V4_1

  	/* clientid returned from EXCHANGE_ID, used by session operations */
  	u64			cl_ex_clid;
  	/* The sequence id to use for the next CREATE_SESSION */
  	u32			cl_seqid;
  	/* The flags used for obtaining the clientid during EXCHANGE_ID */
  	u32			cl_exchange_flags;

  	struct nfs4_session	*cl_session; 	/* sharred session */
  #endif /* CONFIG_NFS_V4_1 */

  #ifdef CONFIG_NFS_FSCACHE
  	struct fscache_cookie	*fscache;	/* client index cache cookie */
  #endif

  };
  
  /*

   * NFS client parameters stored in the superblock.
   */
  struct nfs_server {

  	struct nfs_client *	nfs_client;	/* shared client and NFS4 state */

  	struct list_head	client_link;	/* List of other nfs_server structs
  						 * that share the same client
  						 */
  	struct list_head	master_link;	/* link in master servers list */

  	struct rpc_clnt *	client;		/* RPC client handle */

  	struct rpc_clnt *	client_acl;	/* ACL RPC client handle */

  	struct nlm_host		*nlm_host;	/* NLM client handle */

  	struct nfs_iostats __percpu *io_stats;	/* I/O statistics */

  	struct backing_dev_info	backing_dev_info;

  	atomic_long_t		writeback;	/* number of writeback pages */

  	int			flags;		/* various flags */
  	unsigned int		caps;		/* server capabilities */
  	unsigned int		rsize;		/* read size */
  	unsigned int		rpages;		/* read size (in pages) */
  	unsigned int		wsize;		/* write size */
  	unsigned int		wpages;		/* write size (in pages) */
  	unsigned int		wtmult;		/* server disk block size */
  	unsigned int		dtsize;		/* readdir size */

  	unsigned short		port;		/* "port=" setting */

  	unsigned int		bsize;		/* server block size */
  	unsigned int		acregmin;	/* attr cache timeouts */
  	unsigned int		acregmax;
  	unsigned int		acdirmin;
  	unsigned int		acdirmax;
  	unsigned int		namelen;

  	unsigned int		options;	/* extra options enabled by mount */
  #define NFS_OPTION_FSCACHE	0x00000001	/* - local caching enabled */

  	struct nfs_fsid		fsid;

  	__u64			maxfilesize;	/* maximum file size */

  	unsigned long		mount_time;	/* when this fs was mounted */

  	dev_t			s_dev;		/* superblock dev numbers */

  #ifdef CONFIG_NFS_FSCACHE
  	struct nfs_fscache_key	*fscache_key;	/* unique key for superblock */
  	struct fscache_cookie	*fscache;	/* superblock cookie */
  #endif

  #ifdef CONFIG_NFS_V4

  	u32			attr_bitmask[2];/* V4 bitmask representing the set
  						   of attributes supported on this
  						   filesystem */

  	u32			cache_consistency_bitmask[2];
  						/* V4 bitmask representing the subset
  						   of change attribute, size, ctime
  						   and mtime attributes supported by
  						   the server */

  	u32			acl_bitmask;	/* V4 bitmask representing the ACEs
  						   that are supported on this
  						   filesystem */
  #endif

  	void (*destroy)(struct nfs_server *);

  
  	atomic_t active; /* Keep trace of any activity to this server */

  
  	/* mountd-related mount options */
  	struct sockaddr_storage	mountd_address;
  	size_t			mountd_addrlen;
  	u32			mountd_version;
  	unsigned short		mountd_port;
  	unsigned short		mountd_protocol;

  };
  
  /* Server capabilities */
  #define NFS_CAP_READDIRPLUS	(1U << 0)
  #define NFS_CAP_HARDLINKS	(1U << 1)
  #define NFS_CAP_SYMLINKS	(1U << 2)
  #define NFS_CAP_ACLS		(1U << 3)
  #define NFS_CAP_ATOMIC_OPEN	(1U << 4)

  #define NFS_CAP_CHANGE_ATTR	(1U << 5)
  #define NFS_CAP_FILEID		(1U << 6)
  #define NFS_CAP_MODE		(1U << 7)
  #define NFS_CAP_NLINK		(1U << 8)
  #define NFS_CAP_OWNER		(1U << 9)
  #define NFS_CAP_OWNER_GROUP	(1U << 10)
  #define NFS_CAP_ATIME		(1U << 11)
  #define NFS_CAP_CTIME		(1U << 12)
  #define NFS_CAP_MTIME		(1U << 13)

  #define NFS_CAP_POSIX_LOCK	(1U << 14)

  
  /* maximum number of slots to use */
  #define NFS4_MAX_SLOT_TABLE RPC_MAX_SLOT_TABLE
  
  #if defined(CONFIG_NFS_V4_1)
  
  /* Sessions */
  #define SLOT_TABLE_SZ (NFS4_MAX_SLOT_TABLE/(8*sizeof(long)))
  struct nfs4_slot_table {
  	struct nfs4_slot *slots;		/* seqid per slot */
  	unsigned long   used_slots[SLOT_TABLE_SZ]; /* used/unused bitmap */
  	spinlock_t	slot_tbl_lock;
  	struct rpc_wait_queue	slot_tbl_waitq;	/* allocators may wait here */
  	int		max_slots;		/* # slots in table */
  	int		highest_used_slotid;	/* sent to server on each SEQ.
  						 * op for dynamic resizing */

  	int		target_max_slots;	/* Set by CB_RECALL_SLOT as
  						 * the new max_slots */

  };
  
  static inline int slot_idx(struct nfs4_slot_table *tbl, struct nfs4_slot *sp)
  {
  	return sp - tbl->slots;
  }
  
  /*
   * Session related parameters
   */
  struct nfs4_session {
  	struct nfs4_sessionid		sess_id;
  	u32				flags;
  	unsigned long			session_state;
  	u32				hash_alg;
  	u32				ssv_len;

  	struct completion		complete;

  
  	/* The fore and back channel */
  	struct nfs4_channel_attrs	fc_attrs;
  	struct nfs4_slot_table		fc_slot_table;
  	struct nfs4_channel_attrs	bc_attrs;

  	struct nfs4_slot_table		bc_slot_table;

  	struct nfs_client		*clp;
  };
  
  #endif /* CONFIG_NFS_V4_1 */

  #endif