/* SPDX-License-Identifier: GPL-2.0-or-later */

  /* -*- mode: c; c-basic-offset: 8; -*-
   * vim: noexpandtab sw=8 ts=8 sts=0:
   *
   * dir.h
   *
   * Function prototypes
   *
   * Copyright (C) 2002, 2004 Oracle.  All rights reserved.

   */
  
  #ifndef OCFS2_DIR_H
  #define OCFS2_DIR_H

  struct ocfs2_dx_hinfo {
  	u32	major_hash;
  	u32	minor_hash;
  };

  struct ocfs2_dir_lookup_result {

  	struct buffer_head		*dl_leaf_bh;	/* Unindexed leaf
  							 * block */
  	struct ocfs2_dir_entry		*dl_entry;	/* Target dirent in
  							 * unindexed leaf */

  	struct buffer_head		*dl_dx_root_bh;	/* Root of indexed
  							 * tree */

  	struct buffer_head		*dl_dx_leaf_bh;	/* Indexed leaf block */
  	struct ocfs2_dx_entry		*dl_dx_entry;	/* Target dx_entry in
  							 * indexed leaf */
  	struct ocfs2_dx_hinfo		dl_hinfo;	/* Name hash results */

  
  	struct buffer_head		*dl_prev_leaf_bh;/* Previous entry in
  							  * dir free space
  							  * list. NULL if
  							  * previous entry is
  							  * dx root block. */

  };

  void ocfs2_free_dir_lookup_result(struct ocfs2_dir_lookup_result *res);
  
  int ocfs2_find_entry(const char *name, int namelen,
  		     struct inode *dir,
  		     struct ocfs2_dir_lookup_result *lookup);

  int ocfs2_delete_entry(handle_t *handle,
  		       struct inode *dir,

  		       struct ocfs2_dir_lookup_result *res);

  int __ocfs2_add_entry(handle_t *handle,
  		      struct inode *dir,
  		      const char *name, int namelen,
  		      struct inode *inode, u64 blkno,
  		      struct buffer_head *parent_fe_bh,

  		      struct ocfs2_dir_lookup_result *lookup);

  static inline int ocfs2_add_entry(handle_t *handle,
  				  struct dentry *dentry,
  				  struct inode *inode, u64 blkno,
  				  struct buffer_head *parent_fe_bh,

  				  struct ocfs2_dir_lookup_result *lookup)

  {

  	return __ocfs2_add_entry(handle, d_inode(dentry->d_parent),

  				 dentry->d_name.name, dentry->d_name.len,

  				 inode, blkno, parent_fe_bh, lookup);

  }

  int ocfs2_update_entry(struct inode *dir, handle_t *handle,

  		       struct ocfs2_dir_lookup_result *res,

  		       struct inode *new_entry_inode);

  int ocfs2_check_dir_for_entry(struct inode *dir,
  			      const char *name,
  			      int namelen);

  int ocfs2_empty_dir(struct inode *inode);

  int ocfs2_find_files_on_disk(const char *name,
  			     int namelen,
  			     u64 *blkno,
  			     struct inode *inode,

  			     struct ocfs2_dir_lookup_result *res);

  int ocfs2_lookup_ino_from_name(struct inode *dir, const char *name,
  			       int namelen, u64 *blkno);

  int ocfs2_readdir(struct file *file, struct dir_context *ctx);
  int ocfs2_dir_foreach(struct inode *inode, struct dir_context *ctx);

  int ocfs2_prepare_dir_for_insert(struct ocfs2_super *osb,
  				 struct inode *dir,
  				 struct buffer_head *parent_fe_bh,
  				 const char *name,
  				 int namelen,

  				 struct ocfs2_dir_lookup_result *lookup);

  struct ocfs2_alloc_context;

  int ocfs2_fill_new_dir(struct ocfs2_super *osb,
  		       handle_t *handle,
  		       struct inode *parent,
  		       struct inode *inode,
  		       struct buffer_head *fe_bh,

  		       struct ocfs2_alloc_context *data_ac,
  		       struct ocfs2_alloc_context *meta_ac);
  
  int ocfs2_dx_dir_truncate(struct inode *dir, struct buffer_head *di_bh);

  struct ocfs2_dir_block_trailer *ocfs2_dir_trailer_from_size(int blocksize,
  							    void *data);

  #endif /* OCFS2_DIR_H */