text: /*
   *  ncplib_kernel.h
   *
   *  Copyright (C) 1995, 1996 by Volker Lendecke
   *  Modified for big endian by J.F. Chadima and David S. Miller
   *  Modified 1997 Peter Waltenberg, Bill Hawes, David Woodhouse for 2.1 dcache
   *  Modified 1998, 1999 Wolfram Pienkoss for NLS
   *  Modified 1999 Wolfram Pienkoss for directory caching
   *
   */
  
  #ifndef _NCPLIB_H
  #define _NCPLIB_H
  
  
  #include <linux/fs.h>
  #include <linux/types.h>
  #include <linux/errno.h>
  #include <linux/slab.h>
  #include <linux/stat.h>
  #include <linux/fcntl.h>
  #include <linux/pagemap.h>
  
  #include <asm/uaccess.h>
  #include <asm/byteorder.h>
  #include <asm/unaligned.h>
  #include <asm/string.h>
  
  #ifdef CONFIG_NCPFS_NLS
  #include <linux/nls.h>
  #else
  #include <linux/ctype.h>
  #endif /* CONFIG_NCPFS_NLS */
  
  #define NCP_MIN_SYMLINK_SIZE	8
  #define NCP_MAX_SYMLINK_SIZE	512
  
  #define NCP_BLOCK_SHIFT		9
  #define NCP_BLOCK_SIZE		(1 << (NCP_BLOCK_SHIFT))
  
  int ncp_negotiate_buffersize(struct ncp_server *, int, int *);
  int ncp_negotiate_size_and_options(struct ncp_server *server, int size,
    			  int options, int *ret_size, int *ret_options);
  
  int ncp_get_volume_info_with_number(struct ncp_server* server, int n,
  				    struct ncp_volume_info *target);
  
  int ncp_get_directory_info(struct ncp_server* server, __u8 dirhandle,
  			   struct ncp_volume_info* target);
  
  int ncp_close_file(struct ncp_server *, const char *);
  static inline int ncp_read_bounce_size(__u32 size) {
  	return sizeof(struct ncp_reply_header) + 2 + 2 + size + 8;
  };
  int ncp_read_bounce(struct ncp_server *, const char *, __u32, __u16, 
  		char __user *, int *, void* bounce, __u32 bouncelen);
  int ncp_read_kernel(struct ncp_server *, const char *, __u32, __u16, 
  		char *, int *);
  int ncp_write_kernel(struct ncp_server *, const char *, __u32, __u16,
  		const char *, int *);
  
  static inline void ncp_inode_close(struct inode *inode) {
  	atomic_dec(&NCP_FINFO(inode)->opened);
  }
  
  void ncp_extract_file_info(const void* src, struct nw_info_struct* target);
  int ncp_obtain_info(struct ncp_server *server, struct inode *, const char *,
  		struct nw_info_struct *target);
  int ncp_obtain_nfs_info(struct ncp_server *server, struct nw_info_struct *target);
  int ncp_update_known_namespace(struct ncp_server *server, __u8 volume, int *ret_ns);
  int ncp_get_volume_root(struct ncp_server *server, const char *volname,
  			__u32 *volume, __le32 *dirent, __le32 *dosdirent);
  int ncp_lookup_volume(struct ncp_server *, const char *, struct nw_info_struct *);
  int ncp_modify_file_or_subdir_dos_info(struct ncp_server *, struct inode *,
  	 __le32, const struct nw_modify_dos_info *info);
  int ncp_modify_file_or_subdir_dos_info_path(struct ncp_server *, struct inode *,
  	 const char* path, __le32, const struct nw_modify_dos_info *info);
  int ncp_modify_nfs_info(struct ncp_server *, __u8 volnum, __le32 dirent,
  			__u32 mode, __u32 rdev);
  
  int ncp_del_file_or_subdir2(struct ncp_server *, struct dentry*);
  int ncp_del_file_or_subdir(struct ncp_server *, struct inode *, const char *);
  int ncp_open_create_file_or_subdir(struct ncp_server *, struct inode *, const char *,
  				int, __le32, __le16, struct ncp_entry_info *);
  
  int ncp_initialize_search(struct ncp_server *, struct inode *,
  		      struct nw_search_sequence *target);
  int ncp_search_for_fileset(struct ncp_server *server,
  			   struct nw_search_sequence *seq,
  			   int* more, int* cnt,
  			   char* buffer, size_t bufsize,
  			   char** rbuf, size_t* rsize);
  
  int ncp_ren_or_mov_file_or_subdir(struct ncp_server *server,
  			      struct inode *, const char *, struct inode *, const char *);
  
  
  int
  ncp_LogPhysicalRecord(struct ncp_server *server,
  		      const char *file_id, __u8 locktype,
  		      __u32 offset, __u32 length, __u16 timeout);
  
  #ifdef CONFIG_NCPFS_IOCTL_LOCKING
  int
  ncp_ClearPhysicalRecord(struct ncp_server *server,
  			const char *file_id,
  			__u32 offset, __u32 length);
  #endif	/* CONFIG_NCPFS_IOCTL_LOCKING */
  
  int
  ncp_mount_subdir(struct ncp_server *, __u8, __u8, __le32,
  		 __u32* volume, __le32* dirent, __le32* dosdirent);
  int ncp_dirhandle_alloc(struct ncp_server *, __u8 vol, __le32 dirent, __u8 *dirhandle);
  int ncp_dirhandle_free(struct ncp_server *, __u8 dirhandle);
  
  int ncp_create_new(struct inode *dir, struct dentry *dentry,
                            umode_t mode, dev_t rdev, __le32 attributes);
  
  static inline int ncp_is_nfs_extras(struct ncp_server* server, unsigned int volnum) {
  #ifdef CONFIG_NCPFS_NFS_NS
  	return (server->m.flags & NCP_MOUNT_NFS_EXTRAS) &&
  	       (server->name_space[volnum] == NW_NS_NFS);
  #else
  	return 0;
  #endif
  }
  
  #ifdef CONFIG_NCPFS_NLS
  
  int ncp__io2vol(struct ncp_server *, unsigned char *, unsigned int *,
  				const unsigned char *, unsigned int, int);
  int ncp__vol2io(struct ncp_server *, unsigned char *, unsigned int *,
  				const unsigned char *, unsigned int, int);
  
  #define NCP_ESC			':'
  #define NCP_IO_TABLE(sb)	(NCP_SBP(sb)->nls_io)
  #define ncp_tolower(t, c)	nls_tolower(t, c)
  #define ncp_toupper(t, c)	nls_toupper(t, c)
  #define ncp_strnicmp(t, s1, s2, len) \
  	nls_strnicmp(t, s1, s2, len)
  #define ncp_io2vol(S,m,i,n,k,U)	ncp__io2vol(S,m,i,n,k,U)
  #define ncp_vol2io(S,m,i,n,k,U)	ncp__vol2io(S,m,i,n,k,U)
  
  #else
  
  int ncp__io2vol(unsigned char *, unsigned int *,
  				const unsigned char *, unsigned int, int);
  int ncp__vol2io(unsigned char *, unsigned int *,
  				const unsigned char *, unsigned int, int);
  
  #define NCP_IO_TABLE(sb)	NULL
  #define ncp_tolower(t, c)	tolower(c)
  #define ncp_toupper(t, c)	toupper(c)
  #define ncp_io2vol(S,m,i,n,k,U)	ncp__io2vol(m,i,n,k,U)
  #define ncp_vol2io(S,m,i,n,k,U)	ncp__vol2io(m,i,n,k,U)
  
  
  static inline int ncp_strnicmp(const struct nls_table *t,
  		const unsigned char *s1, const unsigned char *s2, int len)
  {
  	while (len--) {
  		if (tolower(*s1++) != tolower(*s2++))
  			return 1;
  	}
  
  	return 0;
  }
  
  #endif /* CONFIG_NCPFS_NLS */
  
  #define NCP_GET_AGE(dentry)	(jiffies - (dentry)->d_time)
  #define NCP_MAX_AGE(server)	atomic_read(&(server)->dentry_ttl)
  #define NCP_TEST_AGE(server,dentry)	(NCP_GET_AGE(dentry) < NCP_MAX_AGE(server))
  
  static inline void
  ncp_age_dentry(struct ncp_server* server, struct dentry* dentry)
  {
  	dentry->d_time = jiffies - NCP_MAX_AGE(server);
  }
  
  static inline void
  ncp_new_dentry(struct dentry* dentry)
  {
  	dentry->d_time = jiffies;
  }
  
  static inline void
  ncp_renew_dentries(struct dentry *parent)
  {
  	struct ncp_server *server = NCP_SERVER(parent->d_inode);
  	struct dentry *dentry;
  
  	spin_lock(&parent->d_lock);
  	list_for_each_entry(dentry, &parent->d_subdirs, d_child) {
  		if (dentry->d_fsdata == NULL)
  			ncp_age_dentry(server, dentry);
  		else
  			ncp_new_dentry(dentry);
  	}
  	spin_unlock(&parent->d_lock);
  }
  
  static inline void
  ncp_invalidate_dircache_entries(struct dentry *parent)
  {
  	struct ncp_server *server = NCP_SERVER(parent->d_inode);
  	struct dentry *dentry;
  
  	spin_lock(&parent->d_lock);
  	list_for_each_entry(dentry, &parent->d_subdirs, d_child) {
  		dentry->d_fsdata = NULL;
  		ncp_age_dentry(server, dentry);
  	}
  	spin_unlock(&parent->d_lock);
  }
  
  struct ncp_cache_head {
  	time_t		mtime;
  	unsigned long	time;	/* cache age */
  	unsigned long	end;	/* last valid fpos in cache */
  	int		eof;
  };
  
  #define NCP_DIRCACHE_SIZE	((int)(PAGE_CACHE_SIZE/sizeof(struct dentry *)))
  union ncp_dir_cache {
  	struct ncp_cache_head	head;
  	struct dentry		*dentry[NCP_DIRCACHE_SIZE];
  };
  
  #define NCP_FIRSTCACHE_SIZE	((int)((NCP_DIRCACHE_SIZE * \
  	sizeof(struct dentry *) - sizeof(struct ncp_cache_head)) / \
  	sizeof(struct dentry *)))
  
  #define NCP_DIRCACHE_START	(NCP_DIRCACHE_SIZE - NCP_FIRSTCACHE_SIZE)
  
  struct ncp_cache_control {
  	struct	ncp_cache_head		head;
  	struct	page			*page;
  	union	ncp_dir_cache		*cache;
  	unsigned long			fpos, ofs;
  	int				filled, valid, idx;
  };
  
  #endif /* _NCPLIB_H */
  