linux-vybrid_public/fs/xfs/xfs_dir2_node.h

/*
 * 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 __XFS_DIR2_NODE_H__
#define	__XFS_DIR2_NODE_H__

/*
 * Directory version 2, btree node format structures
 */

struct uio;
struct xfs_dabuf;
struct xfs_da_args;
struct xfs_da_state;
struct xfs_da_state_blk;
struct xfs_inode;
struct xfs_trans;

/*
 * Offset of the freespace index.
 */
#define	XFS_DIR2_FREE_SPACE	2
#define	XFS_DIR2_FREE_OFFSET	(XFS_DIR2_FREE_SPACE * XFS_DIR2_SPACE_SIZE)
#define	XFS_DIR2_FREE_FIRSTDB(mp)	\
	XFS_DIR2_BYTE_TO_DB(mp, XFS_DIR2_FREE_OFFSET)

#define	XFS_DIR2_FREE_MAGIC	0x58443246	/* XD2F */

typedef	struct xfs_dir2_free_hdr {
	__uint32_t		magic;		/* XFS_DIR2_FREE_MAGIC */
	__int32_t		firstdb;	/* db of first entry */
	__int32_t		nvalid;		/* count of valid entries */
	__int32_t		nused;		/* count of used entries */
} xfs_dir2_free_hdr_t;

typedef struct xfs_dir2_free {
	xfs_dir2_free_hdr_t	hdr;		/* block header */
	xfs_dir2_data_off_t	bests[1];	/* best free counts */
						/* unused entries are -1 */
} xfs_dir2_free_t;

#define	XFS_DIR2_MAX_FREE_BESTS(mp)	\
	(((mp)->m_dirblksize - (uint)sizeof(xfs_dir2_free_hdr_t)) / \
	 (uint)sizeof(xfs_dir2_data_off_t))

/*
 * Convert data space db to the corresponding free db.
 */
#define	XFS_DIR2_DB_TO_FDB(mp,db)	xfs_dir2_db_to_fdb(mp, db)
static inline xfs_dir2_db_t
xfs_dir2_db_to_fdb(struct xfs_mount *mp, xfs_dir2_db_t db)
{
	return (XFS_DIR2_FREE_FIRSTDB(mp) + (db) / XFS_DIR2_MAX_FREE_BESTS(mp));
}

/*
 * Convert data space db to the corresponding index in a free db.
 */
#define	XFS_DIR2_DB_TO_FDINDEX(mp,db)	xfs_dir2_db_to_fdindex(mp, db)
static inline int
xfs_dir2_db_to_fdindex(struct xfs_mount *mp, xfs_dir2_db_t db)
{
	return ((db) % XFS_DIR2_MAX_FREE_BESTS(mp));
}

extern void xfs_dir2_free_log_bests(struct xfs_trans *tp, struct xfs_dabuf *bp,
				    int first, int last);
extern int xfs_dir2_leaf_to_node(struct xfs_da_args *args,
				 struct xfs_dabuf *lbp);
extern xfs_dahash_t xfs_dir2_leafn_lasthash(struct xfs_dabuf *bp, int *count);
extern int xfs_dir2_leafn_lookup_int(struct xfs_dabuf *bp,
				     struct xfs_da_args *args, int *indexp,
				     struct xfs_da_state *state);
extern int xfs_dir2_leafn_order(struct xfs_dabuf *leaf1_bp,
				struct xfs_dabuf *leaf2_bp);
extern int xfs_dir2_leafn_split(struct xfs_da_state *state,
				struct xfs_da_state_blk *oldblk,
				struct xfs_da_state_blk *newblk);
extern int xfs_dir2_leafn_toosmall(struct xfs_da_state *state, int *action);
extern void xfs_dir2_leafn_unbalance(struct xfs_da_state *state,
				     struct xfs_da_state_blk *drop_blk,
				     struct xfs_da_state_blk *save_blk);
extern int xfs_dir2_node_addname(struct xfs_da_args *args);
extern int xfs_dir2_node_lookup(struct xfs_da_args *args);
extern int xfs_dir2_node_removename(struct xfs_da_args *args);
extern int xfs_dir2_node_replace(struct xfs_da_args *args);
extern int xfs_dir2_node_trim_free(struct xfs_da_args *args, xfs_fileoff_t fo,
				   int *rvalp);

#endif	/* __XFS_DIR2_NODE_H__ */