text: /*
   *  linux/fs/hpfs/hpfs_fn.h
   *
   *  Mikulas Patocka (mikulas@artax.karlin.mff.cuni.cz), 1998-1999
   *
   *  function headers
   */
  
  //#define DBG
  //#define DEBUG_LOCKS
  
  #include <linux/mutex.h>
  #include <linux/pagemap.h>
  #include <linux/buffer_head.h>
  #include <linux/slab.h>
  #include <asm/unaligned.h>
  
  #include "hpfs.h"
  
  #define EIOERROR  EIO
  #define EFSERROR  EPERM
  #define EMEMERROR ENOMEM
  
  #define ANODE_ALLOC_FWD	512
  #define FNODE_ALLOC_FWD	0
  #define ALLOC_FWD_MIN	16
  #define ALLOC_FWD_MAX	128
  #define ALLOC_M		1
  #define FNODE_RD_AHEAD	16
  #define ANODE_RD_AHEAD	16
  #define DNODE_RD_AHEAD	4
  
  #define FREE_DNODES_ADD	58
  #define FREE_DNODES_DEL	29
  
  #define CHKCOND(x,y) if (!(x)) printk y
  
  struct hpfs_inode_info {
  	loff_t mmu_private;
  	ino_t i_parent_dir;	/* (directories) gives fnode of parent dir */
  	unsigned i_dno;		/* (directories) root dnode */
  	unsigned i_dpos;	/* (directories) temp for readdir */
  	unsigned i_dsubdno;	/* (directories) temp for readdir */
  	unsigned i_file_sec;	/* (files) minimalist cache of alloc info */
  	unsigned i_disk_sec;	/* (files) minimalist cache of alloc info */
  	unsigned i_n_secs;	/* (files) minimalist cache of alloc info */
  	unsigned i_ea_size;	/* size of extended attributes */
  	unsigned i_ea_mode : 1;	/* file's permission is stored in ea */
  	unsigned i_ea_uid : 1;	/* file's uid is stored in ea */
  	unsigned i_ea_gid : 1;	/* file's gid is stored in ea */
  	unsigned i_dirty : 1;
  	loff_t **i_rddir_off;
  	struct inode vfs_inode;
  };
  
  struct hpfs_sb_info {
  	struct mutex hpfs_mutex;	/* global hpfs lock */
  	ino_t sb_root;			/* inode number of root dir */
  	unsigned sb_fs_size;		/* file system size, sectors */
  	unsigned sb_bitmaps;		/* sector number of bitmap list */
  	unsigned sb_dirband_start;	/* directory band start sector */
  	unsigned sb_dirband_size;	/* directory band size, dnodes */
  	unsigned sb_dmap;		/* sector number of dnode bit map */
  	unsigned sb_n_free;		/* free blocks for statfs, or -1 */
  	unsigned sb_n_free_dnodes;	/* free dnodes for statfs, or -1 */
  	kuid_t sb_uid;			/* uid from mount options */
  	kgid_t sb_gid;			/* gid from mount options */
  	umode_t sb_mode;		/* mode from mount options */
  	unsigned sb_eas : 2;		/* eas: 0-ignore, 1-ro, 2-rw */
  	unsigned sb_err : 2;		/* on errs: 0-cont, 1-ro, 2-panic */
  	unsigned sb_chk : 2;		/* checks: 0-no, 1-normal, 2-strict */
  	unsigned sb_lowercase : 1;	/* downcase filenames hackery */
  	unsigned sb_was_error : 1;	/* there was an error, set dirty flag */
  	unsigned sb_chkdsk : 2;		/* chkdsk: 0-no, 1-on errs, 2-allways */
  	unsigned char *sb_cp_table;	/* code page tables: */
  					/* 	128 bytes uppercasing table & */
  					/*	128 bytes lowercasing table */
  	__le32 *sb_bmp_dir;		/* main bitmap directory */
  	unsigned sb_c_bitmap;		/* current bitmap */
  	unsigned sb_max_fwd_alloc;	/* max forwad allocation */
  	int sb_timeshift;
  };
  
  /* Four 512-byte buffers and the 2k block obtained by concatenating them */
  
  struct quad_buffer_head {
  	struct buffer_head *bh[4];
  	void *data;
  };
  
  /* The b-tree down pointer from a dir entry */
  
  static inline dnode_secno de_down_pointer (struct hpfs_dirent *de)
  {
    CHKCOND(de->down,("HPFS: de_down_pointer: !de->down\n"));
    return le32_to_cpu(*(__le32 *) ((void *) de + le16_to_cpu(de->length) - 4));
  }
  
  /* The first dir entry in a dnode */
  
  static inline struct hpfs_dirent *dnode_first_de (struct dnode *dnode)
  {
    return (void *) dnode->dirent;
  }
  
  /* The end+1 of the dir entries */
  
  static inline struct hpfs_dirent *dnode_end_de (struct dnode *dnode)
  {
    CHKCOND(le32_to_cpu(dnode->first_free)>=0x14 && le32_to_cpu(dnode->first_free)<=0xa00,("HPFS: dnode_end_de: dnode->first_free = %x\n",(unsigned)le32_to_cpu(dnode->first_free)));
    return (void *) dnode + le32_to_cpu(dnode->first_free);
  }
  
  /* The dir entry after dir entry de */
  
  static inline struct hpfs_dirent *de_next_de (struct hpfs_dirent *de)
  {
    CHKCOND(le16_to_cpu(de->length)>=0x20 && le16_to_cpu(de->length)<0x800,("HPFS: de_next_de: de->length = %x\n",(unsigned)le16_to_cpu(de->length)));
    return (void *) de + le16_to_cpu(de->length);
  }
  
  static inline struct extended_attribute *fnode_ea(struct fnode *fnode)
  {
  	return (struct extended_attribute *)((char *)fnode + le16_to_cpu(fnode->ea_offs) + le16_to_cpu(fnode->acl_size_s));
  }
  
  static inline struct extended_attribute *fnode_end_ea(struct fnode *fnode)
  {
  	return (struct extended_attribute *)((char *)fnode + le16_to_cpu(fnode->ea_offs) + le16_to_cpu(fnode->acl_size_s) + le16_to_cpu(fnode->ea_size_s));
  }
  
  static unsigned ea_valuelen(struct extended_attribute *ea)
  {
  	return ea->valuelen_lo + 256 * ea->valuelen_hi;
  }
  
  static inline struct extended_attribute *next_ea(struct extended_attribute *ea)
  {
  	return (struct extended_attribute *)((char *)ea + 5 + ea->namelen + ea_valuelen(ea));
  }
  
  static inline secno ea_sec(struct extended_attribute *ea)
  {
  	return le32_to_cpu(get_unaligned((__le32 *)((char *)ea + 9 + ea->namelen)));
  }
  
  static inline secno ea_len(struct extended_attribute *ea)
  {
  	return le32_to_cpu(get_unaligned((__le32 *)((char *)ea + 5 + ea->namelen)));
  }
  
  static inline char *ea_data(struct extended_attribute *ea)
  {
  	return (char *)((char *)ea + 5 + ea->namelen);
  }
  
  static inline unsigned de_size(int namelen, secno down_ptr)
  {
  	return ((0x1f + namelen + 3) & ~3) + (down_ptr ? 4 : 0);
  }
  
  static inline void copy_de(struct hpfs_dirent *dst, struct hpfs_dirent *src)
  {
  	int a;
  	int n;
  	if (!dst || !src) return;
  	a = dst->down;
  	n = dst->not_8x3;
  	memcpy((char *)dst + 2, (char *)src + 2, 28);
  	dst->down = a;
  	dst->not_8x3 = n;
  }
  
  static inline unsigned tstbits(__le32 *bmp, unsigned b, unsigned n)
  {
  	int i;
  	if ((b >= 0x4000) || (b + n - 1 >= 0x4000)) return n;
  	if (!((le32_to_cpu(bmp[(b & 0x3fff) >> 5]) >> (b & 0x1f)) & 1)) return 1;
  	for (i = 1; i < n; i++)
  		if (!((le32_to_cpu(bmp[((b+i) & 0x3fff) >> 5]) >> ((b+i) & 0x1f)) & 1))
  			return i + 1;
  	return 0;
  }
  
  /* alloc.c */
  
  int hpfs_chk_sectors(struct super_block *, secno, int, char *);
  secno hpfs_alloc_sector(struct super_block *, secno, unsigned, int);
  int hpfs_alloc_if_possible(struct super_block *, secno);
  void hpfs_free_sectors(struct super_block *, secno, unsigned);
  int hpfs_check_free_dnodes(struct super_block *, int);
  void hpfs_free_dnode(struct super_block *, secno);
  struct dnode *hpfs_alloc_dnode(struct super_block *, secno, dnode_secno *, struct quad_buffer_head *);
  struct fnode *hpfs_alloc_fnode(struct super_block *, secno, fnode_secno *, struct buffer_head **);
  struct anode *hpfs_alloc_anode(struct super_block *, secno, anode_secno *, struct buffer_head **);
  
  /* anode.c */
  
  secno hpfs_bplus_lookup(struct super_block *, struct inode *, struct bplus_header *, unsigned, struct buffer_head *);
  secno hpfs_add_sector_to_btree(struct super_block *, secno, int, unsigned);
  void hpfs_remove_btree(struct super_block *, struct bplus_header *);
  int hpfs_ea_read(struct super_block *, secno, int, unsigned, unsigned, char *);
  int hpfs_ea_write(struct super_block *, secno, int, unsigned, unsigned, const char *);
  void hpfs_ea_remove(struct super_block *, secno, int, unsigned);
  void hpfs_truncate_btree(struct super_block *, secno, int, unsigned);
  void hpfs_remove_fnode(struct super_block *, fnode_secno fno);
  
  /* buffer.c */
  
  void *hpfs_map_sector(struct super_block *, unsigned, struct buffer_head **, int);
  void *hpfs_get_sector(struct super_block *, unsigned, struct buffer_head **);
  void *hpfs_map_4sectors(struct super_block *, unsigned, struct quad_buffer_head *, int);
  void *hpfs_get_4sectors(struct super_block *, unsigned, struct quad_buffer_head *);
  void hpfs_brelse4(struct quad_buffer_head *);
  void hpfs_mark_4buffers_dirty(struct quad_buffer_head *);
  
  /* dentry.c */
  
  extern const struct dentry_operations hpfs_dentry_operations;
  
  /* dir.c */
  
  struct dentry *hpfs_lookup(struct inode *, struct dentry *, unsigned int);
  extern const struct file_operations hpfs_dir_ops;
  
  /* dnode.c */
  
  void hpfs_add_pos(struct inode *, loff_t *);
  void hpfs_del_pos(struct inode *, loff_t *);
  struct hpfs_dirent *hpfs_add_de(struct super_block *, struct dnode *,
  				const unsigned char *, unsigned, secno);
  int hpfs_add_dirent(struct inode *, const unsigned char *, unsigned,
  		    struct hpfs_dirent *);
  int hpfs_remove_dirent(struct inode *, dnode_secno, struct hpfs_dirent *, struct quad_buffer_head *, int);
  void hpfs_count_dnodes(struct super_block *, dnode_secno, int *, int *, int *);
  dnode_secno hpfs_de_as_down_as_possible(struct super_block *, dnode_secno dno);
  struct hpfs_dirent *map_pos_dirent(struct inode *, loff_t *, struct quad_buffer_head *);
  struct hpfs_dirent *map_dirent(struct inode *, dnode_secno,
  			       const unsigned char *, unsigned, dnode_secno *,
  			       struct quad_buffer_head *);
  void hpfs_remove_dtree(struct super_block *, dnode_secno);
  struct hpfs_dirent *map_fnode_dirent(struct super_block *, fnode_secno, struct fnode *, struct quad_buffer_head *);
  
  /* ea.c */
  
  void hpfs_ea_ext_remove(struct super_block *, secno, int, unsigned);
  int hpfs_read_ea(struct super_block *, struct fnode *, char *, char *, int);
  char *hpfs_get_ea(struct super_block *, struct fnode *, char *, int *);
  void hpfs_set_ea(struct inode *, struct fnode *, const char *,
  		 const char *, int);
  
  /* file.c */
  
  int hpfs_file_fsync(struct file *, loff_t, loff_t, int);
  void hpfs_truncate(struct inode *);
  extern const struct file_operations hpfs_file_ops;
  extern const struct inode_operations hpfs_file_iops;
  extern const struct address_space_operations hpfs_aops;
  
  /* inode.c */
  
  void hpfs_init_inode(struct inode *);
  void hpfs_read_inode(struct inode *);
  void hpfs_write_inode(struct inode *);
  void hpfs_write_inode_nolock(struct inode *);
  int hpfs_setattr(struct dentry *, struct iattr *);
  void hpfs_write_if_changed(struct inode *);
  void hpfs_evict_inode(struct inode *);
  
  /* map.c */
  
  __le32 *hpfs_map_dnode_bitmap(struct super_block *, struct quad_buffer_head *);
  __le32 *hpfs_map_bitmap(struct super_block *, unsigned, struct quad_buffer_head *, char *);
  unsigned char *hpfs_load_code_page(struct super_block *, secno);
  __le32 *hpfs_load_bitmap_directory(struct super_block *, secno bmp);
  struct fnode *hpfs_map_fnode(struct super_block *s, ino_t, struct buffer_head **);
  struct anode *hpfs_map_anode(struct super_block *s, anode_secno, struct buffer_head **);
  struct dnode *hpfs_map_dnode(struct super_block *s, dnode_secno, struct quad_buffer_head *);
  dnode_secno hpfs_fnode_dno(struct super_block *s, ino_t ino);
  
  /* name.c */
  
  unsigned char hpfs_upcase(unsigned char *, unsigned char);
  int hpfs_chk_name(const unsigned char *, unsigned *);
  unsigned char *hpfs_translate_name(struct super_block *, unsigned char *, unsigned, int, int);
  int hpfs_compare_names(struct super_block *, const unsigned char *, unsigned,
  		       const unsigned char *, unsigned, int);
  int hpfs_is_name_long(const unsigned char *, unsigned);
  void hpfs_adjust_length(const unsigned char *, unsigned *);
  
  /* namei.c */
  
  extern const struct inode_operations hpfs_dir_iops;
  extern const struct address_space_operations hpfs_symlink_aops;
  
  static inline struct hpfs_inode_info *hpfs_i(struct inode *inode)
  {
  	return list_entry(inode, struct hpfs_inode_info, vfs_inode);
  }
  
  static inline struct hpfs_sb_info *hpfs_sb(struct super_block *sb)
  {
  	return sb->s_fs_info;
  }
  
  /* super.c */
  
  __printf(2, 3)
  void hpfs_error(struct super_block *, const char *, ...);
  int hpfs_stop_cycles(struct super_block *, int, int *, int *, char *);
  unsigned hpfs_count_one_bitmap(struct super_block *, secno);
  
  /*
   * local time (HPFS) to GMT (Unix)
   */
  
  static inline time_t local_to_gmt(struct super_block *s, time32_t t)
  {
  	extern struct timezone sys_tz;
  	return t + sys_tz.tz_minuteswest * 60 + hpfs_sb(s)->sb_timeshift;
  }
  
  static inline time32_t gmt_to_local(struct super_block *s, time_t t)
  {
  	extern struct timezone sys_tz;
  	return t - sys_tz.tz_minuteswest * 60 - hpfs_sb(s)->sb_timeshift;
  }
  
  /*
   * Locking:
   *
   * hpfs_lock() locks the whole filesystem. It must be taken
   * on any method called by the VFS.
   *
   * We don't do any per-file locking anymore, it is hard to
   * review and HPFS is not performance-sensitive anyway.
   */
  static inline void hpfs_lock(struct super_block *s)
  {
  	struct hpfs_sb_info *sbi = hpfs_sb(s);
  	mutex_lock(&sbi->hpfs_mutex);
  }
  
  static inline void hpfs_unlock(struct super_block *s)
  {
  	struct hpfs_sb_info *sbi = hpfs_sb(s);
  	mutex_unlock(&sbi->hpfs_mutex);
  }
  
  static inline void hpfs_lock_assert(struct super_block *s)
  {
  	struct hpfs_sb_info *sbi = hpfs_sb(s);
  	WARN_ON(!mutex_is_locked(&sbi->hpfs_mutex));
  }
  