#ifndef FS_MINIX_H
  #define FS_MINIX_H

  #include <linux/fs.h>
  #include <linux/pagemap.h>
  #include <linux/minix_fs.h>

  #define INODE_VERSION(inode)	minix_sb(inode->i_sb)->s_version

  #define MINIX_V1		0x0001		/* original minix fs */
  #define MINIX_V2		0x0002		/* minix V2 fs */

  #define MINIX_V3		0x0003		/* minix V3 fs */

  
  /*
   * minix fs inode data in memory
   */
  struct minix_inode_info {
  	union {
  		__u16 i1_data[16];
  		__u32 i2_data[16];
  	} u;
  	struct inode vfs_inode;
  };
  
  /*
   * minix super-block data in memory
   */
  struct minix_sb_info {
  	unsigned long s_ninodes;
  	unsigned long s_nzones;
  	unsigned long s_imap_blocks;
  	unsigned long s_zmap_blocks;
  	unsigned long s_firstdatazone;
  	unsigned long s_log_zone_size;
  	unsigned long s_max_size;
  	int s_dirsize;
  	int s_namelen;

  	struct buffer_head ** s_imap;
  	struct buffer_head ** s_zmap;
  	struct buffer_head * s_sbh;
  	struct minix_super_block * s_ms;
  	unsigned short s_mount_state;
  	unsigned short s_version;
  };

  extern struct inode *minix_iget(struct super_block *, unsigned long);

  extern struct minix_inode * minix_V1_raw_inode(struct super_block *, ino_t, struct buffer_head **);
  extern struct minix2_inode * minix_V2_raw_inode(struct super_block *, ino_t, struct buffer_head **);

  extern struct inode * minix_new_inode(const struct inode *, umode_t, int *);

  extern void minix_free_inode(struct inode * inode);

  extern unsigned long minix_count_free_inodes(struct super_block *sb);

  extern int minix_new_block(struct inode * inode);

  extern void minix_free_block(struct inode *inode, unsigned long block);

  extern unsigned long minix_count_free_blocks(struct super_block *sb);

  extern int minix_getattr(struct vfsmount *, struct dentry *, struct kstat *);

  extern int minix_prepare_chunk(struct page *page, loff_t pos, unsigned len);

  extern void V1_minix_truncate(struct inode *);
  extern void V2_minix_truncate(struct inode *);
  extern void minix_truncate(struct inode *);

  extern void minix_set_inode(struct inode *, dev_t);
  extern int V1_minix_get_block(struct inode *, long, struct buffer_head *, int);
  extern int V2_minix_get_block(struct inode *, long, struct buffer_head *, int);

  extern unsigned V1_minix_blocks(loff_t, struct super_block *);
  extern unsigned V2_minix_blocks(loff_t, struct super_block *);

  
  extern struct minix_dir_entry *minix_find_entry(struct dentry*, struct page**);
  extern int minix_add_link(struct dentry*, struct inode*);
  extern int minix_delete_entry(struct minix_dir_entry*, struct page*);
  extern int minix_make_empty(struct inode*, struct inode*);
  extern int minix_empty_dir(struct inode*);
  extern void minix_set_link(struct minix_dir_entry*, struct page*, struct inode*);
  extern struct minix_dir_entry *minix_dotdot(struct inode*, struct page**);
  extern ino_t minix_inode_by_name(struct dentry*);

  extern const struct inode_operations minix_file_inode_operations;
  extern const struct inode_operations minix_dir_inode_operations;

  extern const struct file_operations minix_file_operations;
  extern const struct file_operations minix_dir_operations;

  
  static inline struct minix_sb_info *minix_sb(struct super_block *sb)
  {
  	return sb->s_fs_info;
  }
  
  static inline struct minix_inode_info *minix_i(struct inode *inode)
  {

  	return container_of(inode, struct minix_inode_info, vfs_inode);

  }

  static inline unsigned minix_blocks_needed(unsigned bits, unsigned blocksize)
  {
  	return DIV_ROUND_UP(bits, blocksize * 8);
  }

  #if defined(CONFIG_MINIX_FS_NATIVE_ENDIAN) && \
  	defined(CONFIG_MINIX_FS_BIG_ENDIAN_16BIT_INDEXED)
  
  #error Minix file system byte order broken
  
  #elif defined(CONFIG_MINIX_FS_NATIVE_ENDIAN)
  
  /*
   * big-endian 32 or 64 bit indexed bitmaps on big-endian system or
   * little-endian bitmaps on little-endian system
   */
  
  #define minix_test_and_set_bit(nr, addr)	\
  	__test_and_set_bit((nr), (unsigned long *)(addr))
  #define minix_set_bit(nr, addr)		\
  	__set_bit((nr), (unsigned long *)(addr))
  #define minix_test_and_clear_bit(nr, addr) \
  	__test_and_clear_bit((nr), (unsigned long *)(addr))
  #define minix_test_bit(nr, addr)		\
  	test_bit((nr), (unsigned long *)(addr))
  #define minix_find_first_zero_bit(addr, size) \
  	find_first_zero_bit((unsigned long *)(addr), (size))
  
  #elif defined(CONFIG_MINIX_FS_BIG_ENDIAN_16BIT_INDEXED)
  
  /*
   * big-endian 16bit indexed bitmaps
   */
  
  static inline int minix_find_first_zero_bit(const void *vaddr, unsigned size)
  {
  	const unsigned short *p = vaddr, *addr = vaddr;
  	unsigned short num;
  
  	if (!size)
  		return 0;

  	size >>= 4;

  	while (*p++ == 0xffff) {
  		if (--size == 0)
  			return (p - addr) << 4;
  	}
  
  	num = *--p;
  	return ((p - addr) << 4) + ffz(num);
  }
  
  #define minix_test_and_set_bit(nr, addr)	\
  	__test_and_set_bit((nr) ^ 16, (unsigned long *)(addr))
  #define minix_set_bit(nr, addr)	\
  	__set_bit((nr) ^ 16, (unsigned long *)(addr))
  #define minix_test_and_clear_bit(nr, addr)	\
  	__test_and_clear_bit((nr) ^ 16, (unsigned long *)(addr))
  
  static inline int minix_test_bit(int nr, const void *vaddr)
  {
  	const unsigned short *p = vaddr;
  	return (p[nr >> 4] & (1U << (nr & 15))) != 0;
  }
  
  #else
  
  /*
   * little-endian bitmaps
   */
  
  #define minix_test_and_set_bit	__test_and_set_bit_le
  #define minix_set_bit		__set_bit_le
  #define minix_test_and_clear_bit	__test_and_clear_bit_le
  #define minix_test_bit	test_bit_le
  #define minix_find_first_zero_bit	find_first_zero_bit_le
  
  #endif

  #endif /* FS_MINIX_H */