/*
   * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.

   * Copyright (C) 2004-2006 Red Hat, Inc.  All rights reserved.

   *
   * This copyrighted material is made available to anyone wishing to use,
   * modify, copy, or redistribute it subject to the terms and conditions

   * of the GNU General Public License version 2.

   */
  
  #ifndef __DIR_DOT_H__
  #define __DIR_DOT_H__

  #include <linux/dcache.h>

  #include <linux/crc32.h>

  
  struct inode;
  struct gfs2_inode;
  struct gfs2_inum;

  extern struct inode *gfs2_dir_search(struct inode *dir,
  				     const struct qstr *filename);
  extern int gfs2_dir_check(struct inode *dir, const struct qstr *filename,
  			  const struct gfs2_inode *ip);
  extern int gfs2_dir_add(struct inode *inode, const struct qstr *filename,

  			const struct gfs2_inode *ip);

  extern int gfs2_dir_del(struct gfs2_inode *dip, const struct dentry *dentry);

  extern int gfs2_dir_read(struct inode *inode, u64 *offset, void *opaque,

  			 filldir_t filldir, struct file_ra_state *f_ra);

  extern int gfs2_dir_mvino(struct gfs2_inode *dip, const struct qstr *filename,
  			  const struct gfs2_inode *nip, unsigned int new_type);

  extern int gfs2_dir_exhash_dealloc(struct gfs2_inode *dip);

  extern int gfs2_diradd_alloc_required(struct inode *dir,
  				      const struct qstr *filename);
  extern int gfs2_dir_get_new_buffer(struct gfs2_inode *ip, u64 block,
  				   struct buffer_head **bhp);

  extern void gfs2_dir_hash_inval(struct gfs2_inode *ip);

  static inline u32 gfs2_disk_hash(const char *data, int len)

  {

          return crc32_le((u32)~0, data, len) ^ (u32)~0;

  }
  
  
  static inline void gfs2_str2qstr(struct qstr *name, const char *fname)
  {
  	name->name = fname;
  	name->len = strlen(fname);
  	name->hash = gfs2_disk_hash(name->name, name->len);
  }

  /* N.B. This probably ought to take inum & type as args as well */
  static inline void gfs2_qstr2dirent(const struct qstr *name, u16 reclen, struct gfs2_dirent *dent)
  {
  	dent->de_inum.no_addr = cpu_to_be64(0);
  	dent->de_inum.no_formal_ino = cpu_to_be64(0);
  	dent->de_hash = cpu_to_be32(name->hash);
  	dent->de_rec_len = cpu_to_be16(reclen);
  	dent->de_name_len = cpu_to_be16(name->len);
  	dent->de_type = cpu_to_be16(0);
  	memset(dent->__pad, 0, sizeof(dent->__pad));

  	memcpy(dent + 1, name->name, name->len);

  }

  extern struct qstr gfs2_qdot;
  extern struct qstr gfs2_qdotdot;

  #endif /* __DIR_DOT_H__ */