/*
   * NFS internal definitions
   */

  #include "nfs4_fs.h"

  #include <linux/mount.h>

  #include <linux/security.h>

  #define NFS_MS_MASK (MS_RDONLY|MS_NOSUID|MS_NODEV|MS_NOEXEC|MS_SYNCHRONOUS)

  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)

  /*
   * Determine if sessions are in use.
   */
  static inline int nfs4_has_session(const struct nfs_client *clp)
  {
  #ifdef CONFIG_NFS_V4_1
  	if (clp->cl_session)
  		return 1;
  #endif /* CONFIG_NFS_V4_1 */
  	return 0;
  }

  static inline int nfs4_has_persistent_session(const struct nfs_client *clp)
  {
  #ifdef CONFIG_NFS_V4_1
  	if (nfs4_has_session(clp))
  		return (clp->cl_session->flags & SESSION4_PERSIST);
  #endif /* CONFIG_NFS_V4_1 */
  	return 0;
  }

  static inline void nfs_attr_check_mountpoint(struct super_block *parent, struct nfs_fattr *fattr)
  {
  	if (!nfs_fsid_equal(&NFS_SB(parent)->fsid, &fattr->fsid))
  		fattr->valid |= NFS_ATTR_FATTR_MOUNTPOINT;
  }

  static inline int nfs_attr_use_mounted_on_fileid(struct nfs_fattr *fattr)
  {
  	if (((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) == 0) ||
  	    (((fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT) == 0) &&
  	     ((fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) == 0)))
  		return 0;
  
  	fattr->fileid = fattr->mounted_on_fileid;
  	return 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;
  };

  /*

   * Note: RFC 1813 doesn't limit the number of auth flavors that
   * a server can return, so make something up.
   */
  #define NFS_MAX_SECFLAVORS	(12)
  
  /*

   * Value used if the user did not specify a port value.
   */
  #define NFS_UNSPEC_PORT		(-1)
  
  /*

   * Maximum number of pages that readdir can use for creating
   * a vmapped array of pages.
   */
  #define NFS_MAX_READDIR_PAGES 8
  
  /*

   * 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		options;

  	unsigned int		bsize;
  	unsigned int		auth_flavor_len;
  	rpc_authflavor_t	auth_flavors[1];
  	char			*client_address;

  	unsigned int		version;

  	unsigned int		minorversion;

  	char			*fscache_uniq;

  
  	struct {

  		struct sockaddr_storage	address;
  		size_t			addrlen;

  		char			*hostname;

  		u32			version;

  		int			port;

  		unsigned short		protocol;

  	} mount_server;
  
  	struct {

  		struct sockaddr_storage	address;
  		size_t			addrlen;

  		char			*hostname;
  		char			*export_path;

  		int			port;

  		unsigned short		protocol;

  	} nfs_server;

  
  	struct security_mnt_opts lsm_opts;

  };

  /* mount_clnt.c */

  struct nfs_mount_request {
  	struct sockaddr		*sap;
  	size_t			salen;
  	char			*hostname;
  	char			*dirpath;
  	u32			version;
  	unsigned short		protocol;
  	struct nfs_fh		*fh;

  	int			noresvport;

  	unsigned int		*auth_flav_len;
  	rpc_authflavor_t	*auth_flavs;

  };
  
  extern int nfs_mount(struct nfs_mount_request *info);

  extern void nfs_umount(const struct nfs_mount_request *info);

  /* client.c */

  extern struct rpc_program nfs_program;

  extern void nfs_cleanup_cb_ident_idr(void);

  extern void nfs_put_client(struct nfs_client *);

  extern struct nfs_client *nfs4_find_client_no_ident(const struct sockaddr *);
  extern struct nfs_client *nfs4_find_client_ident(int);
  extern struct nfs_client *

  nfs4_find_client_sessionid(const struct sockaddr *, struct nfs4_sessionid *);

  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 *);

  extern void nfs_mark_client_ready(struct nfs_client *clp, int state);

  extern int nfs4_check_client_ready(struct nfs_client *clp);

  extern struct nfs_client *nfs4_set_ds_client(struct nfs_client* mds_clp,
  					     const struct sockaddr *ds_addr,
  					     int ds_addrlen, int ds_proto);

  #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(struct dentry *dentry);

  #else
  static inline

  struct vfsmount *nfs_do_refmount(struct dentry *dentry)

  {
  	return ERR_PTR(-ENOENT);
  }
  #endif
  
  /* callback_xdr.c */
  extern struct svc_version nfs4_callback_version1;

  extern struct svc_version nfs4_callback_version4;

  
  /* 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(enum nfs_stat);

  extern struct rpc_procinfo nfs_procedures[];

  extern int nfs2_decode_dirent(struct xdr_stream *,
  				struct nfs_entry *, int);

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

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

  
  /* nfs4xdr.c */

  #ifdef CONFIG_NFS_V4

  extern int nfs4_decode_dirent(struct xdr_stream *,
  				struct nfs_entry *, int);

  #endif

  #ifdef CONFIG_NFS_V4_1
  extern const u32 nfs41_maxread_overhead;
  extern const u32 nfs41_maxwrite_overhead;
  #endif

  
  /* nfs4proc.c */

  #ifdef CONFIG_NFS_V4

  extern struct rpc_procinfo nfs4_procedures[];

  void nfs_fixup_secinfo_attributes(struct nfs_fattr *, struct nfs_fh *);

  #endif

  extern int nfs4_init_ds_session(struct nfs_client *clp);

  /* proc.c */
  void nfs_close_context(struct nfs_open_context *ctx, int is_sync);

  extern int nfs_init_client(struct nfs_client *clp,
  			   const struct rpc_timeout *timeparms,
  			   const char *ip_addr, rpc_authflavor_t authflavour,
  			   int noresvport);

  /* dir.c */

  extern int nfs_access_cache_shrinker(struct shrinker *shrink,

  					struct shrink_control *sc);

  /* 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 *, struct writeback_control *);

  extern void nfs_evict_inode(struct inode *);

  #ifdef CONFIG_NFS_V4

  extern void nfs4_evict_inode(struct inode *);

  #endif

  void nfs_zap_acl_cache(struct inode *inode);

  extern int nfs_wait_bit_killable(void *word);

  
  /* super.c */

  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(char **p, struct dentry *dentry,

  		      char *buffer, ssize_t buflen);

  extern struct vfsmount *nfs_d_automount(struct path *path);

  #ifdef CONFIG_NFS_V4
  rpc_authflavor_t nfs_find_best_sec(struct nfs4_secinfo_flavors *);
  #endif

  /* getroot.c */

  extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *,
  				   const char *);

  #ifdef CONFIG_NFS_V4

  extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *,
  				    const char *);

  extern int nfs4_get_rootfh(struct nfs_server *server, struct nfs_fh *mntfh);

  #endif

  struct nfs_pageio_descriptor;

  /* read.c */

  extern int nfs_initiate_read(struct nfs_read_data *data, struct rpc_clnt *clnt,
  			     const struct rpc_call_ops *call_ops);

  extern void nfs_read_prepare(struct rpc_task *task, void *calldata);

  extern int nfs_generic_pagein(struct nfs_pageio_descriptor *desc,
  		struct list_head *head);

  extern void nfs_pageio_init_read_mds(struct nfs_pageio_descriptor *pgio,
  		struct inode *inode);

  extern void nfs_pageio_reset_read_mds(struct nfs_pageio_descriptor *pgio);
  extern void nfs_readdata_release(struct nfs_read_data *rdata);

  /* write.c */

  extern int nfs_generic_flush(struct nfs_pageio_descriptor *desc,
  		struct list_head *head);

  extern void nfs_pageio_init_write_mds(struct nfs_pageio_descriptor *pgio,
  				  struct inode *inode, int ioflags);

  extern void nfs_pageio_reset_write_mds(struct nfs_pageio_descriptor *pgio);
  extern void nfs_writedata_release(struct nfs_write_data *wdata);

  extern void nfs_commit_free(struct nfs_write_data *p);

  extern int nfs_initiate_write(struct nfs_write_data *data,
  			      struct rpc_clnt *clnt,
  			      const struct rpc_call_ops *call_ops,
  			      int how);

  extern void nfs_write_prepare(struct rpc_task *task, void *calldata);

  extern int nfs_initiate_commit(struct nfs_write_data *data,
  			       struct rpc_clnt *clnt,
  			       const struct rpc_call_ops *call_ops,
  			       int how);
  extern void nfs_init_commit(struct nfs_write_data *data,
  			    struct list_head *head,
  			    struct pnfs_layout_segment *lseg);
  void nfs_retry_commit(struct list_head *page_list,
  		      struct pnfs_layout_segment *lseg);
  void nfs_commit_clear_lock(struct nfs_inode *nfsi);
  void nfs_commitdata_release(void *data);
  void nfs_commit_release_pages(struct nfs_write_data *data);

  #ifdef CONFIG_MIGRATION
  extern int nfs_migrate_page(struct address_space *,

  		struct page *, struct page *, enum migrate_mode);

  #else
  #define nfs_migrate_page NULL
  #endif

  /* nfs4proc.c */

  extern void __nfs4_read_done_cb(struct nfs_read_data *);

  extern void nfs4_reset_read(struct rpc_task *task, struct nfs_read_data *data);

  extern int nfs4_init_client(struct nfs_client *clp,
  			    const struct rpc_timeout *timeparms,
  			    const char *ip_addr,
  			    rpc_authflavor_t authflavour,
  			    int noresvport);

  extern void nfs4_reset_write(struct rpc_task *task, struct nfs_write_data *data);

  extern int _nfs4_call_sync(struct rpc_clnt *clnt,
  			   struct nfs_server *server,

  			   struct rpc_message *msg,
  			   struct nfs4_sequence_args *args,
  			   struct nfs4_sequence_res *res,
  			   int cache_reply);

  extern int _nfs4_call_sync_session(struct rpc_clnt *clnt,
  				   struct nfs_server *server,

  				   struct rpc_message *msg,
  				   struct nfs4_sequence_args *args,
  				   struct nfs4_sequence_res *res,
  				   int cache_reply);

  /*

   * Determine the device name as a string
   */

  static inline char *nfs_devname(struct dentry *dentry,

  				char *buffer, ssize_t buflen)

  {

  	char *dummy;
  	return nfs_path(&dummy, 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;
  }

  
  /*

   * Convert a umode to a dirent->d_type
   */
  static inline
  unsigned char nfs_umode_to_dtype(umode_t mode)
  {
  	return (mode >> 12) & 15;
  }
  
  /*

   * 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;
  }