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kernel/linux-imx6_3.14.28/fs/xfs/xfs_dir2.h 6.71 KB
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  /*
   * 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_H__
  #define __XFS_DIR2_H__
  
  struct xfs_bmap_free;
  struct xfs_da_args;
  struct xfs_inode;
  struct xfs_mount;
  struct xfs_trans;
  struct xfs_dir2_sf_hdr;
  struct xfs_dir2_sf_entry;
  struct xfs_dir2_data_hdr;
  struct xfs_dir2_data_entry;
  struct xfs_dir2_data_unused;
  
  extern struct xfs_name	xfs_name_dotdot;
  
  /*
   * directory operations vector for encode/decode routines
   */
  struct xfs_dir_ops {
  	int	(*sf_entsize)(struct xfs_dir2_sf_hdr *hdr, int len);
  	struct xfs_dir2_sf_entry *
  		(*sf_nextentry)(struct xfs_dir2_sf_hdr *hdr,
  				struct xfs_dir2_sf_entry *sfep);
  	__uint8_t (*sf_get_ftype)(struct xfs_dir2_sf_entry *sfep);
  	void	(*sf_put_ftype)(struct xfs_dir2_sf_entry *sfep,
  				__uint8_t ftype);
  	xfs_ino_t (*sf_get_ino)(struct xfs_dir2_sf_hdr *hdr,
  				struct xfs_dir2_sf_entry *sfep);
  	void	(*sf_put_ino)(struct xfs_dir2_sf_hdr *hdr,
  			      struct xfs_dir2_sf_entry *sfep,
  			      xfs_ino_t ino);
  	xfs_ino_t (*sf_get_parent_ino)(struct xfs_dir2_sf_hdr *hdr);
  	void	(*sf_put_parent_ino)(struct xfs_dir2_sf_hdr *hdr,
  				     xfs_ino_t ino);
  
  	int	(*data_entsize)(int len);
  	__uint8_t (*data_get_ftype)(struct xfs_dir2_data_entry *dep);
  	void	(*data_put_ftype)(struct xfs_dir2_data_entry *dep,
  				__uint8_t ftype);
  	__be16 * (*data_entry_tag_p)(struct xfs_dir2_data_entry *dep);
  	struct xfs_dir2_data_free *
  		(*data_bestfree_p)(struct xfs_dir2_data_hdr *hdr);
  
  	xfs_dir2_data_aoff_t data_dot_offset;
  	xfs_dir2_data_aoff_t data_dotdot_offset;
  	xfs_dir2_data_aoff_t data_first_offset;
  	size_t	data_entry_offset;
  
  	struct xfs_dir2_data_entry *
  		(*data_dot_entry_p)(struct xfs_dir2_data_hdr *hdr);
  	struct xfs_dir2_data_entry *
  		(*data_dotdot_entry_p)(struct xfs_dir2_data_hdr *hdr);
  	struct xfs_dir2_data_entry *
  		(*data_first_entry_p)(struct xfs_dir2_data_hdr *hdr);
  	struct xfs_dir2_data_entry *
  		(*data_entry_p)(struct xfs_dir2_data_hdr *hdr);
  	struct xfs_dir2_data_unused *
  		(*data_unused_p)(struct xfs_dir2_data_hdr *hdr);
  
  	int	leaf_hdr_size;
  	void	(*leaf_hdr_to_disk)(struct xfs_dir2_leaf *to,
  				    struct xfs_dir3_icleaf_hdr *from);
  	void	(*leaf_hdr_from_disk)(struct xfs_dir3_icleaf_hdr *to,
  				      struct xfs_dir2_leaf *from);
  	int	(*leaf_max_ents)(struct xfs_mount *mp);
  	struct xfs_dir2_leaf_entry *
  		(*leaf_ents_p)(struct xfs_dir2_leaf *lp);
  
  	int	node_hdr_size;
  	void	(*node_hdr_to_disk)(struct xfs_da_intnode *to,
  				    struct xfs_da3_icnode_hdr *from);
  	void	(*node_hdr_from_disk)(struct xfs_da3_icnode_hdr *to,
  				      struct xfs_da_intnode *from);
  	struct xfs_da_node_entry *
  		(*node_tree_p)(struct xfs_da_intnode *dap);
  
  	int	free_hdr_size;
  	void	(*free_hdr_to_disk)(struct xfs_dir2_free *to,
  				    struct xfs_dir3_icfree_hdr *from);
  	void	(*free_hdr_from_disk)(struct xfs_dir3_icfree_hdr *to,
  				      struct xfs_dir2_free *from);
  	int	(*free_max_bests)(struct xfs_mount *mp);
  	__be16 * (*free_bests_p)(struct xfs_dir2_free *free);
  	xfs_dir2_db_t (*db_to_fdb)(struct xfs_mount *mp, xfs_dir2_db_t db);
  	int	(*db_to_fdindex)(struct xfs_mount *mp, xfs_dir2_db_t db);
  };
  
  extern const struct xfs_dir_ops *
  	xfs_dir_get_ops(struct xfs_mount *mp, struct xfs_inode *dp);
  extern const struct xfs_dir_ops *
  	xfs_nondir_get_ops(struct xfs_mount *mp, struct xfs_inode *dp);
  
  /*
   * Generic directory interface routines
   */
  extern void xfs_dir_startup(void);
  extern void xfs_dir_mount(struct xfs_mount *mp);
  extern int xfs_dir_isempty(struct xfs_inode *dp);
  extern int xfs_dir_init(struct xfs_trans *tp, struct xfs_inode *dp,
  				struct xfs_inode *pdp);
  extern int xfs_dir_createname(struct xfs_trans *tp, struct xfs_inode *dp,
  				struct xfs_name *name, xfs_ino_t inum,
  				xfs_fsblock_t *first,
  				struct xfs_bmap_free *flist, xfs_extlen_t tot);
  extern int xfs_dir_lookup(struct xfs_trans *tp, struct xfs_inode *dp,
  				struct xfs_name *name, xfs_ino_t *inum,
  				struct xfs_name *ci_name);
  extern int xfs_dir_removename(struct xfs_trans *tp, struct xfs_inode *dp,
  				struct xfs_name *name, xfs_ino_t ino,
  				xfs_fsblock_t *first,
  				struct xfs_bmap_free *flist, xfs_extlen_t tot);
  extern int xfs_dir_replace(struct xfs_trans *tp, struct xfs_inode *dp,
  				struct xfs_name *name, xfs_ino_t inum,
  				xfs_fsblock_t *first,
  				struct xfs_bmap_free *flist, xfs_extlen_t tot);
  extern int xfs_dir_canenter(struct xfs_trans *tp, struct xfs_inode *dp,
  				struct xfs_name *name, uint resblks);
  
  /*
   * Direct call from the bmap code, bypassing the generic directory layer.
   */
  extern int xfs_dir2_sf_to_block(struct xfs_da_args *args);
  
  /*
   * Interface routines used by userspace utilities
   */
  extern int xfs_dir2_isblock(struct xfs_trans *tp, struct xfs_inode *dp, int *r);
  extern int xfs_dir2_isleaf(struct xfs_trans *tp, struct xfs_inode *dp, int *r);
  extern int xfs_dir2_shrink_inode(struct xfs_da_args *args, xfs_dir2_db_t db,
  				struct xfs_buf *bp);
  
  extern void xfs_dir2_data_freescan(struct xfs_inode *dp,
  		struct xfs_dir2_data_hdr *hdr, int *loghead);
  extern void xfs_dir2_data_log_entry(struct xfs_trans *tp, struct xfs_inode *dp,
  		struct xfs_buf *bp, struct xfs_dir2_data_entry *dep);
  extern void xfs_dir2_data_log_header(struct xfs_trans *tp, struct xfs_inode *dp,
  		struct xfs_buf *bp);
  extern void xfs_dir2_data_log_unused(struct xfs_trans *tp, struct xfs_buf *bp,
  		struct xfs_dir2_data_unused *dup);
  extern void xfs_dir2_data_make_free(struct xfs_trans *tp, struct xfs_inode *dp,
  		struct xfs_buf *bp, xfs_dir2_data_aoff_t offset,
  		xfs_dir2_data_aoff_t len, int *needlogp, int *needscanp);
  extern void xfs_dir2_data_use_free(struct xfs_trans *tp, struct xfs_inode *dp,
  		struct xfs_buf *bp, struct xfs_dir2_data_unused *dup,
  		xfs_dir2_data_aoff_t offset, xfs_dir2_data_aoff_t len,
  		int *needlogp, int *needscanp);
  
  extern struct xfs_dir2_data_free *xfs_dir2_data_freefind(
  		struct xfs_dir2_data_hdr *hdr, struct xfs_dir2_data_free *bf,
  		struct xfs_dir2_data_unused *dup);
  
  extern const struct xfs_buf_ops xfs_dir3_block_buf_ops;
  extern const struct xfs_buf_ops xfs_dir3_leafn_buf_ops;
  extern const struct xfs_buf_ops xfs_dir3_leaf1_buf_ops;
  extern const struct xfs_buf_ops xfs_dir3_free_buf_ops;
  extern const struct xfs_buf_ops xfs_dir3_data_buf_ops;
  
  #endif	/* __XFS_DIR2_H__ */