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Updated copyright and license notices, ready for open source release
Merge of 2.3.99pre2-xfs:slinx:55821a by ananth.

/*
 * Copyright (c) 2000 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 _FS_XFS_DIR_H
#define	_FS_XFS_DIR_H

#ident	"$Revision$"

/*
 * xfs_dir.h
 *
 * Large directories are structured around Btrees where all the data
 * elements are in the leaf nodes.  Filenames are hashed into an int,
 * then that int is used as the index into the Btree.  Since the hashval
 * of a filename may not be unique, we may have duplicate keys.  The
 * internal links in the Btree are logical block offsets into the file.
 *
 * Small directories use a different format and are packed as tightly
 * as possible so as to fit into the literal area of the inode.
 */

#ifdef XFS_ALL_TRACE
#define	XFS_DIR_TRACE
#endif

#if !defined(DEBUG) || defined(SIM)
#undef XFS_DIR_TRACE
#endif

/*========================================================================
 * Function prototypes for the kernel.
 *========================================================================*/

struct uio;
struct xfs_bmap_free;
struct xfs_da_args;
struct xfs_dinode;
struct xfs_inode;
struct xfs_mount;
struct xfs_trans;

/*
 * Directory function types.
 * Put in structures (xfs_dirops_t) for v1 and v2 directories.
 */
typedef void	(*xfs_dir_mount_t)(struct xfs_mount *mp);
typedef int	(*xfs_dir_isempty_t)(struct xfs_inode *dp);
typedef int	(*xfs_dir_init_t)(struct xfs_trans *tp,
				  struct xfs_inode *dp,
				  struct xfs_inode *pdp);
typedef int	(*xfs_dir_createname_t)(struct xfs_trans *tp,
					struct xfs_inode *dp,
					char *name,
					int namelen,
					xfs_ino_t inum,
					xfs_fsblock_t *first,
					struct xfs_bmap_free *flist,
					xfs_extlen_t total);
typedef int	(*xfs_dir_lookup_t)(struct xfs_trans *tp,
				    struct xfs_inode *dp,
				    char *name,
				    int namelen,
				    xfs_ino_t *inum);
#if defined(XFS_REPAIR_SIM) || !defined(SIM)
typedef int	(*xfs_dir_removename_t)(struct xfs_trans *tp,
					struct xfs_inode *dp,
					char *name,
					int namelen,
					xfs_ino_t ino,
					xfs_fsblock_t *first,
					struct xfs_bmap_free *flist,
					xfs_extlen_t total);
#endif /* XFS_REPAIR_SIM || !SIM */
#ifdef XFS_REPAIR_SIM
typedef int	(*xfs_dir_bogus_removename_t)(struct xfs_trans *tp,
					      struct xfs_inode *dp,
					      char *name,
					      xfs_fsblock_t *first,
					      struct xfs_bmap_free *flist,
					      xfs_extlen_t total,
					      xfs_dahash_t hash,
					      int namelen);
#endif	/* XFS_REPAIR_SIM */
#ifndef SIM
typedef int	(*xfs_dir_getdents_t)(struct xfs_trans *tp,
				      struct xfs_inode *dp,
				      struct uio *uio,
				      int *eofp);
#endif	/* !SIM */
#if defined(XFS_REPAIR_SIM) || !defined(SIM)
typedef int	(*xfs_dir_replace_t)(struct xfs_trans *tp,
				     struct xfs_inode *dp,
				     char *name,
				     int namelen,
				     xfs_ino_t inum,
				     xfs_fsblock_t *first,
				     struct xfs_bmap_free *flist,
				     xfs_extlen_t total);
#endif /* XFS_REPAIR_SIM || !SIM */
typedef int	(*xfs_dir_canenter_t)(struct xfs_trans *tp,
				      struct xfs_inode *dp,
				      char *name,
				      int namelen);
typedef int	(*xfs_dir_shortform_validate_ondisk_t)(struct xfs_mount *mp,
						       struct xfs_dinode *dip);
typedef int	(*xfs_dir_shortform_to_single_t)(struct xfs_da_args *args);

typedef struct xfs_dirops {
	xfs_dir_mount_t				xd_mount;
	xfs_dir_isempty_t			xd_isempty;
	xfs_dir_init_t				xd_init;
	xfs_dir_createname_t			xd_createname;
	xfs_dir_lookup_t			xd_lookup;
#if defined(XFS_REPAIR_SIM) || !defined(SIM)
	xfs_dir_removename_t			xd_removename;
#endif /* XFS_REPAIR_SIM || !SIM */
#ifdef XFS_REPAIR_SIM
	xfs_dir_bogus_removename_t		xd_bogus_removename;
#endif /* XFS_REPAIR_SIM */
#ifndef SIM
	xfs_dir_getdents_t			xd_getdents;
#endif /* !SIM */
#if defined(XFS_REPAIR_SIM) || !defined(SIM)
	xfs_dir_replace_t			xd_replace;
#endif /* XFS_REPAIR_SIM || !SIM */
	xfs_dir_canenter_t			xd_canenter;
	xfs_dir_shortform_validate_ondisk_t	xd_shortform_validate_ondisk;
	xfs_dir_shortform_to_single_t		xd_shortform_to_single;
} xfs_dirops_t;

/*
 * Overall external interface routines.
 */
void	xfs_dir_startup(void);	/* called exactly once */

#define	XFS_DIR_MOUNT(mp)	\
	((mp)->m_dirops.xd_mount(mp))
#define	XFS_DIR_ISEMPTY(mp,dp)	\
	((mp)->m_dirops.xd_isempty(dp))
#define	XFS_DIR_INIT(mp,tp,dp,pdp)	\
	((mp)->m_dirops.xd_init(tp,dp,pdp))
#define	XFS_DIR_CREATENAME(mp,tp,dp,name,namelen,inum,first,flist,total) \
	((mp)->m_dirops.xd_createname(tp,dp,name,namelen,inum,first,flist,\
				      total))
#define	XFS_DIR_LOOKUP(mp,tp,dp,name,namelen,inum)	\
	((mp)->m_dirops.xd_lookup(tp,dp,name,namelen,inum))
#if defined(XFS_REPAIR_SIM) || !defined(SIM)
#define	XFS_DIR_REMOVENAME(mp,tp,dp,name,namelen,ino,first,flist,total)	\
	((mp)->m_dirops.xd_removename(tp,dp,name,namelen,ino,first,flist,total))
#endif /* XFS_REPAIR_SIM || !SIM */
#ifdef XFS_REPAIR_SIM
#define	XFS_DIR_BOGUS_REMOVENAME(mp,tp,dp,name,first,flist,total,hash,namelen)	\
	((mp)->m_dirops.xd_bogus_removename(tp,dp,name,first,flist,total,\
					    hash,namelen))
#endif
#ifndef SIM
#define	XFS_DIR_GETDENTS(mp,tp,dp,uio,eofp)	\
	((mp)->m_dirops.xd_getdents(tp,dp,uio,eofp))
#endif /* !SIM */
#if defined(XFS_REPAIR_SIM) || !defined(SIM)
#define	XFS_DIR_REPLACE(mp,tp,dp,name,namelen,inum,first,flist,total)	\
	((mp)->m_dirops.xd_replace(tp,dp,name,namelen,inum,first,flist,total))
#endif /* XFS_REPAIR_SIM || !SIM */
#define	XFS_DIR_CANENTER(mp,tp,dp,name,namelen)	\
	((mp)->m_dirops.xd_canenter(tp,dp,name,namelen))
#define	XFS_DIR_SHORTFORM_VALIDATE_ONDISK(mp,dip)	\
	((mp)->m_dirops.xd_shortform_validate_ondisk(mp,dip))
#define	XFS_DIR_SHORTFORM_TO_SINGLE(mp,args)	\
	((mp)->m_dirops.xd_shortform_to_single(args))

#define	XFS_DIR_IS_V1(mp)	((mp)->m_dirversion == 1)
extern xfs_dirops_t xfsv1_dirops;

#endif	/* !_FS_XFS_DIR_H */