/*
   * NFS internal definitions
   */
  
  #include <linux/mount.h>

  #include <linux/security.h>

  struct nfs_string;

  
  /* Maximum number of readahead requests
   * FIXME: this should really be a sysctl so that users may tune it to suit
   *        their needs. People that do NFS over a slow network, might for
   *        instance want to reduce it to something closer to 1 for improved
   *        interactive response.
   */
  #define NFS_MAX_READAHEAD	(RPC_DEF_SLOT_TABLE - 1)

  struct nfs_clone_mount {
  	const struct super_block *sb;
  	const struct dentry *dentry;
  	struct nfs_fh *fh;
  	struct nfs_fattr *fattr;
  	char *hostname;
  	char *mnt_path;

  	struct sockaddr *addr;
  	size_t addrlen;

  	rpc_authflavor_t authflavor;
  };

  /*
   * In-kernel mount arguments
   */
  struct nfs_parsed_mount_data {
  	int			flags;
  	int			rsize, wsize;
  	int			timeo, retrans;
  	int			acregmin, acregmax,
  				acdirmin, acdirmax;
  	int			namlen;
  	unsigned int		bsize;
  	unsigned int		auth_flavor_len;
  	rpc_authflavor_t	auth_flavors[1];
  	char			*client_address;
  
  	struct {

  		struct sockaddr_storage	address;
  		size_t			addrlen;

  		char			*hostname;

  		u32			version;

  		unsigned short		port;

  		unsigned short		protocol;

  	} mount_server;
  
  	struct {

  		struct sockaddr_storage	address;
  		size_t			addrlen;

  		char			*hostname;
  		char			*export_path;

  		unsigned short		port;

  		unsigned short		protocol;

  	} nfs_server;

  
  	struct security_mnt_opts lsm_opts;

  };

  /* client.c */

  extern struct rpc_program nfs_program;

  extern void nfs_put_client(struct nfs_client *);

  extern struct nfs_client *nfs_find_client(const struct sockaddr *, u32);

  extern struct nfs_client *nfs_find_client_next(struct nfs_client *);

  extern struct nfs_server *nfs_create_server(
  					const struct nfs_parsed_mount_data *,
  					struct nfs_fh *);

  extern struct nfs_server *nfs4_create_server(
  					const struct nfs_parsed_mount_data *,
  					struct nfs_fh *);

  extern struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *,
  						      struct nfs_fh *);
  extern void nfs_free_server(struct nfs_server *server);
  extern struct nfs_server *nfs_clone_server(struct nfs_server *,
  					   struct nfs_fh *,
  					   struct nfs_fattr *);

  #ifdef CONFIG_PROC_FS
  extern int __init nfs_fs_proc_init(void);
  extern void nfs_fs_proc_exit(void);
  #else
  static inline int nfs_fs_proc_init(void)
  {
  	return 0;
  }
  static inline void nfs_fs_proc_exit(void)
  {
  }
  #endif

  /* nfs4namespace.c */

  #ifdef CONFIG_NFS_V4
  extern struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry);
  #else
  static inline
  struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry)
  {
  	return ERR_PTR(-ENOENT);
  }
  #endif
  
  /* callback_xdr.c */
  extern struct svc_version nfs4_callback_version1;
  
  /* pagelist.c */
  extern int __init nfs_init_nfspagecache(void);

  extern void nfs_destroy_nfspagecache(void);

  extern int __init nfs_init_readpagecache(void);

  extern void nfs_destroy_readpagecache(void);

  extern int __init nfs_init_writepagecache(void);

  extern void nfs_destroy_writepagecache(void);

  extern int __init nfs_init_directcache(void);

  extern void nfs_destroy_directcache(void);

  
  /* nfs2xdr.c */

  extern int nfs_stat_to_errno(int);

  extern struct rpc_procinfo nfs_procedures[];

  extern __be32 * nfs_decode_dirent(__be32 *, struct nfs_entry *, int);

  
  /* nfs3xdr.c */
  extern struct rpc_procinfo nfs3_procedures[];

  extern __be32 *nfs3_decode_dirent(__be32 *, struct nfs_entry *, int);

  
  /* nfs4xdr.c */

  #ifdef CONFIG_NFS_V4

  extern __be32 *nfs4_decode_dirent(__be32 *p, struct nfs_entry *entry, int plus);

  #endif

  
  /* nfs4proc.c */

  #ifdef CONFIG_NFS_V4

  extern struct rpc_procinfo nfs4_procedures[];

  #endif

  /* dir.c */
  extern int nfs_access_cache_shrinker(int nr_to_scan, gfp_t gfp_mask);

  /* inode.c */

  extern struct workqueue_struct *nfsiod_workqueue;

  extern struct inode *nfs_alloc_inode(struct super_block *sb);
  extern void nfs_destroy_inode(struct inode *);
  extern int nfs_write_inode(struct inode *,int);
  extern void nfs_clear_inode(struct inode *);
  #ifdef CONFIG_NFS_V4
  extern void nfs4_clear_inode(struct inode *);
  #endif

  void nfs_zap_acl_cache(struct inode *inode);

  
  /* super.c */

  void nfs_parse_ip_address(char *, size_t, struct sockaddr *, size_t *);

  extern struct file_system_type nfs_xdev_fs_type;

  #ifdef CONFIG_NFS_V4

  extern struct file_system_type nfs4_xdev_fs_type;
  extern struct file_system_type nfs4_referral_fs_type;

  #endif

  extern struct rpc_stat nfs_rpcstat;

  extern int __init register_nfs_fs(void);
  extern void __exit unregister_nfs_fs(void);

  extern void nfs_sb_active(struct super_block *sb);
  extern void nfs_sb_deactive(struct super_block *sb);

  
  /* namespace.c */

  extern char *nfs_path(const char *base,
  		      const struct dentry *droot,
  		      const struct dentry *dentry,

  		      char *buffer, ssize_t buflen);

  /* getroot.c */
  extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *);

  #ifdef CONFIG_NFS_V4

  extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *);
  
  extern int nfs4_path_walk(struct nfs_server *server,
  			  struct nfs_fh *mntfh,
  			  const char *path);

  #endif

  
  /*
   * Determine the device name as a string
   */
  static inline char *nfs_devname(const struct vfsmount *mnt_parent,

  				const struct dentry *dentry,
  				char *buffer, ssize_t buflen)

  {

  	return nfs_path(mnt_parent->mnt_devname, mnt_parent->mnt_root,
  			dentry, buffer, buflen);

  }
  
  /*
   * Determine the actual block size (and log2 thereof)
   */
  static inline
  unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp)
  {
  	/* make sure blocksize is a power of two */
  	if ((bsize & (bsize - 1)) || nrbitsp) {
  		unsigned char	nrbits;
  
  		for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--)
  			;
  		bsize = 1 << nrbits;
  		if (nrbitsp)
  			*nrbitsp = nrbits;
  	}
  
  	return bsize;
  }
  
  /*
   * Calculate the number of 512byte blocks used.
   */

  static inline blkcnt_t nfs_calc_block_size(u64 tsize)

  {

  	blkcnt_t used = (tsize + 511) >> 9;

  	return (used > ULONG_MAX) ? ULONG_MAX : used;
  }
  
  /*
   * Compute and set NFS server blocksize
   */
  static inline
  unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp)
  {
  	if (bsize < NFS_MIN_FILE_IO_SIZE)
  		bsize = NFS_DEF_FILE_IO_SIZE;
  	else if (bsize >= NFS_MAX_FILE_IO_SIZE)
  		bsize = NFS_MAX_FILE_IO_SIZE;
  
  	return nfs_block_bits(bsize, nrbitsp);
  }
  
  /*
   * Determine the maximum file size for a superblock
   */
  static inline
  void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize)
  {
  	sb->s_maxbytes = (loff_t)maxfilesize;
  	if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0)
  		sb->s_maxbytes = MAX_LFS_FILESIZE;
  }

  
  /*
   * Determine the number of bytes of data the page contains
   */
  static inline
  unsigned int nfs_page_length(struct page *page)
  {
  	loff_t i_size = i_size_read(page->mapping->host);
  
  	if (i_size > 0) {
  		pgoff_t end_index = (i_size - 1) >> PAGE_CACHE_SHIFT;
  		if (page->index < end_index)
  			return PAGE_CACHE_SIZE;
  		if (page->index == end_index)
  			return ((i_size - 1) & ~PAGE_CACHE_MASK) + 1;
  	}
  	return 0;
  }

  
  /*
   * Determine the number of pages in an array of length 'len' and
   * with a base offset of 'base'
   */
  static inline
  unsigned int nfs_page_array_len(unsigned int base, size_t len)
  {
  	return ((unsigned long)len + (unsigned long)base +
  		PAGE_SIZE - 1) >> PAGE_SHIFT;
  }

  #define IPV6_SCOPE_DELIMITER	'%'

  
  /*
   * Set the port number in an address.  Be agnostic about the address
   * family.
   */
  static inline void nfs_set_port(struct sockaddr *sap, unsigned short port)
  {

  	struct sockaddr_in *ap = (struct sockaddr_in *)sap;
  	struct sockaddr_in6 *ap6 = (struct sockaddr_in6 *)sap;

  	switch (sap->sa_family) {

  	case AF_INET:
  		ap->sin_port = htons(port);
  		break;
  	case AF_INET6:
  		ap6->sin6_port = htons(port);
  		break;

  	}
  }