/*

   * Copyright (c) 2000-2001,2005 Silicon Graphics, Inc.
   * All Rights Reserved.

   *

   * This program is free software; you can redistribute it and/or
   * modify it under the terms of the GNU General Public License as

   * published by the Free Software Foundation.
   *

   * This program is distributed in the hope that it would be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   * GNU General Public License for more details.

   *

   * You should have received a copy of the GNU General Public License
   * along with this program; if not, write the Free Software Foundation,
   * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

   */
  #ifndef __XFS_DIR2_BLOCK_H__
  #define	__XFS_DIR2_BLOCK_H__
  
  /*
   * xfs_dir2_block.h
   * Directory version 2, single block format structures
   */
  
  struct uio;
  struct xfs_dabuf;
  struct xfs_da_args;
  struct xfs_dir2_data_hdr;
  struct xfs_dir2_leaf_entry;
  struct xfs_inode;
  struct xfs_mount;
  struct xfs_trans;
  
  /*
   * The single block format is as follows:
   * xfs_dir2_data_hdr_t structure
   * xfs_dir2_data_entry_t and xfs_dir2_data_unused_t structures
   * xfs_dir2_leaf_entry_t structures
   * xfs_dir2_block_tail_t structure
   */
  
  #define	XFS_DIR2_BLOCK_MAGIC	0x58443242	/* XD2B: for one block dirs */
  
  typedef struct xfs_dir2_block_tail {

  	__be32		count;			/* count of leaf entries */
  	__be32		stale;			/* count of stale lf entries */

  } xfs_dir2_block_tail_t;
  
  /*
   * Generic single-block structure, for xfs_db.
   */
  typedef struct xfs_dir2_block {
  	xfs_dir2_data_hdr_t	hdr;		/* magic XFS_DIR2_BLOCK_MAGIC */
  	xfs_dir2_data_union_t	u[1];
  	xfs_dir2_leaf_entry_t	leaf[1];
  	xfs_dir2_block_tail_t	tail;
  } xfs_dir2_block_t;
  
  /*
   * Pointer to the leaf header embedded in a data block (1-block format)
   */

  static inline xfs_dir2_block_tail_t *
  xfs_dir2_block_tail_p(struct xfs_mount *mp, xfs_dir2_block_t *block)
  {
  	return (((xfs_dir2_block_tail_t *)
  		((char *)(block) + (mp)->m_dirblksize)) - 1);
  }

  
  /*
   * Pointer to the leaf entries embedded in a data block (1-block format)
   */

  static inline struct xfs_dir2_leaf_entry *
  xfs_dir2_block_leaf_p(xfs_dir2_block_tail_t *btp)
  {

  	return ((struct xfs_dir2_leaf_entry *)btp) - be32_to_cpu(btp->count);

  }

  
  /*
   * Function declarations.
   */

  extern int xfs_dir2_block_addname(struct xfs_da_args *args);
  extern int xfs_dir2_block_getdents(struct xfs_trans *tp, struct xfs_inode *dp,
  				   struct uio *uio, int *eofp,
  				   struct xfs_dirent *dbp, xfs_dir2_put_t put);
  extern int xfs_dir2_block_lookup(struct xfs_da_args *args);
  extern int xfs_dir2_block_removename(struct xfs_da_args *args);
  extern int xfs_dir2_block_replace(struct xfs_da_args *args);
  extern int xfs_dir2_leaf_to_block(struct xfs_da_args *args,
  				  struct xfs_dabuf *lbp, struct xfs_dabuf *dbp);
  extern int xfs_dir2_sf_to_block(struct xfs_da_args *args);

  
  #endif	/* __XFS_DIR2_BLOCK_H__ */