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/*
 * Copyright (c) 2000-2001 Silicon Graphics, Inc.  All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of version 2 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.
 *
 * Further, this software is distributed without any warranty that it is
 * free of the rightful claim of any third person regarding infringement
 * or the like.  Any license provided herein, whether implied or
 * otherwise, applies only to this software file.  Patent licenses, if
 * any, provided herein do not apply to combinations of this program with
 * other software, or any other product whatsoever.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write the Free Software Foundation, Inc., 59
 * Temple Place - Suite 330, Boston MA 02111-1307, USA.
 *
 * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
 * Mountain View, CA  94043, or:
 *
 * http://www.sgi.com
 *
 * For further information regarding this notice, see:
 *
 * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
 */

#ifndef _XR_DIR_H
#define _XR_DIR_H

struct blkmap;

/* 1 bit per byte, max XFS blocksize == 64K bits / NBBY */
#define DA_BMAP_SIZE		8192

typedef unsigned char	da_freemap_t;

/*
 * the cursor gets passed up and down the da btree processing
 * routines.  The interior block processing routines use the
 * cursor to determine if the pointers to and from the preceding
 * and succeeding sibling blocks are ok and whether the values in
 * the current block are consistent with the entries in the parent
 * nodes.  When a block is traversed, a parent-verification routine
 * is called to verify if the next logical entry in the next level up
 * is consistent with the greatest hashval in the next block of the
 * current level.  The verification routine is itself recursive and
 * calls itself if it has to traverse an interior block to get
 * the next logical entry.  The routine recurses upwards through
 * the tree until it finds a block where it can simply step to
 * the next entry.  The hashval in that entry should be equal to
 * the hashval being passed to it (the greatest hashval in the block
 * that the entry points to).  If that isn't true, then the tree
 * is blown and we need to trash it, salvage and trash it, or fix it.
 * Currently, we just trash it.
 */
typedef struct da_level_state  {
	xfs_buf_t	*bp;		/* block bp */
#ifdef XR_DIR_TRACE
	xfs_da_intnode_t *n;		/* bp data */
#endif
	xfs_dablk_t	bno;		/* file block number */
	xfs_dahash_t	hashval;	/* last verified hashval */
	int		index;		/* current index in block */
	int		dirty;		/* is buffer dirty ? (1 == yes) */
} da_level_state_t;

typedef struct da_bt_cursor  {
	int			active;	/* highest level in tree (# levels-1) */
	int			type;	/* 0 if dir, 1 if attr */
	xfs_ino_t		ino;
	xfs_dablk_t		greatest_bno;
	xfs_dinode_t		*dip;
	da_level_state_t	level[XFS_DA_NODE_MAXDEPTH];
	struct blkmap		*blkmap;
} da_bt_cursor_t;


/* ROUTINES */

void
err_release_da_cursor(
	xfs_mount_t	*mp,
	da_bt_cursor_t	*cursor,
	int		prev_level);

xfs_dfsbno_t
get_first_dblock_fsbno(
	xfs_mount_t	*mp,
	xfs_ino_t	ino,
	xfs_dinode_t	*dino);

void
init_da_freemap(
	da_freemap_t *dir_freemap);

int
namecheck(
	char		*name,
	int		length);

int
process_shortform_dir(
	xfs_mount_t	*mp,
	xfs_ino_t	ino,
	xfs_dinode_t	*dip,
	int		ino_discovery,
	int		*dino_dirty,	/* is dinode buffer dirty? */
	xfs_ino_t	*parent,	/* out - NULLFSINO if entry doesn't exist */
	char		*dirname,	/* directory pathname */
	int		*repair);	/* out - 1 if dir was fixed up */

int
process_dir(
	xfs_mount_t	*mp,
	xfs_ino_t	ino,
	xfs_dinode_t	*dip,
	int		ino_discovery,
	int		*dirty,
	char		*dirname,
	xfs_ino_t	*parent,
	struct blkmap	*blkmap);

void
release_da_cursor(
	xfs_mount_t	*mp,
	da_bt_cursor_t	*cursor,
	int		prev_level);

int
set_da_freemap(
	xfs_mount_t *mp, da_freemap_t *map,
	int start, int stop);

int
traverse_int_dablock(
	xfs_mount_t	*mp,
	da_bt_cursor_t		*da_cursor,
	xfs_dablk_t		*rbno,
	int			whichfork);

int
verify_da_path(
	xfs_mount_t	*mp,
	da_bt_cursor_t		*cursor,
	const int		p_level);

int
verify_final_da_path(
	xfs_mount_t	*mp,
	da_bt_cursor_t		*cursor,
	const int		p_level);


#endif /* _XR_DIR_H */