linux-vybrid_public/fs/xfs/xfs_dir2.h

/*
 * 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 __XFS_DIR2_H__
#define	__XFS_DIR2_H__

struct uio;
struct xfs_dabuf;
struct xfs_da_args;
struct xfs_dir2_put_args;
struct xfs_inode;
struct xfs_trans;

/*
 * Directory version 2.
 * There are 4 possible formats:
 *	shortform
 *	single block - data with embedded leaf at the end
 *	multiple data blocks, single leaf+freeindex block
 *	data blocks, node&leaf blocks (btree), freeindex blocks
 *
 *	The shortform format is in xfs_dir2_sf.h.
 *	The single block format is in xfs_dir2_block.h.
 *	The data block format is in xfs_dir2_data.h.
 *	The leaf and freeindex block formats are in xfs_dir2_leaf.h.
 *	Node blocks are the same as the other version, in xfs_da_btree.h.
 */

/*
 * Byte offset in data block and shortform entry.
 */
typedef	__uint16_t	xfs_dir2_data_off_t;
#define	NULLDATAOFF	0xffffU
typedef uint		xfs_dir2_data_aoff_t;	/* argument form */

/*
 * Directory block number (logical dirblk in file)
 */
typedef	__uint32_t	xfs_dir2_db_t;

/*
 * Byte offset in a directory.
 */
typedef	xfs_off_t		xfs_dir2_off_t;

/*
 * For getdents, argument struct for put routines.
 */
typedef int (*xfs_dir2_put_t)(struct xfs_dir2_put_args *pa);
typedef struct xfs_dir2_put_args {
	xfs_off_t		cook;		/* cookie of (next) entry */
	xfs_intino_t	ino;		/* inode number */
	struct xfs_dirent	*dbp;		/* buffer pointer */
	char		*name;		/* directory entry name */
	int		namelen;	/* length of name */
	int		done;		/* output: set if value was stored */
	xfs_dir2_put_t	put;		/* put function ptr (i/o) */
	struct uio	*uio;		/* uio control structure */
} xfs_dir2_put_args_t;

#define	XFS_DIR_IS_V2(mp)	((mp)->m_dirversion == 2)
extern xfs_dirops_t	xfsv2_dirops;

/*
 * Other interfaces used by the rest of the dir v2 code.
 */
extern int
	xfs_dir2_grow_inode(struct xfs_da_args *args, int space,
			    xfs_dir2_db_t *dbp);

extern int
	xfs_dir2_isblock(struct xfs_trans *tp, struct xfs_inode *dp, int *vp);

extern int
	xfs_dir2_isleaf(struct xfs_trans *tp, struct xfs_inode *dp, int *vp);

extern int
	xfs_dir2_shrink_inode(struct xfs_da_args *args, xfs_dir2_db_t db,
			      struct xfs_dabuf *bp);

#endif	/* __XFS_DIR2_H__ */