linux/fs/xfs/xfs_dir2_block.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_BLOCK_H__
#define	__XFS_DIR2_BLOCK_H__

/*
 * xfs_dir2_block.h
 * Directory version 2, single block format structures
 */

struct uio;
struct xfs_dabuf;
struct xfs_da_args;
struct xfs_dir2_data_hdr;
struct xfs_dir2_leaf_entry;
struct xfs_inode;
struct xfs_mount;
struct xfs_trans;

/*
 * The single block format is as follows:
 * xfs_dir2_data_hdr_t structure
 * xfs_dir2_data_entry_t and xfs_dir2_data_unused_t structures
 * xfs_dir2_leaf_entry_t structures
 * xfs_dir2_block_tail_t structure
 */

#define	XFS_DIR2_BLOCK_MAGIC	0x58443242	/* XD2B: for one block dirs */

typedef struct xfs_dir2_block_tail {
	__uint32_t	count;			/* count of leaf entries */
	__uint32_t	stale;			/* count of stale lf entries */
} xfs_dir2_block_tail_t;

/*
 * Generic single-block structure, for xfs_db.
 */
typedef struct xfs_dir2_block {
	xfs_dir2_data_hdr_t	hdr;		/* magic XFS_DIR2_BLOCK_MAGIC */
	xfs_dir2_data_union_t	u[1];
	xfs_dir2_leaf_entry_t	leaf[1];
	xfs_dir2_block_tail_t	tail;
} xfs_dir2_block_t;

/*
 * Pointer to the leaf header embedded in a data block (1-block format)
 */
#define	XFS_DIR2_BLOCK_TAIL_P(mp,block)	xfs_dir2_block_tail_p(mp,block)
static inline xfs_dir2_block_tail_t *
xfs_dir2_block_tail_p(struct xfs_mount *mp, xfs_dir2_block_t *block)
{
	return (((xfs_dir2_block_tail_t *)
		((char *)(block) + (mp)->m_dirblksize)) - 1);
}

/*
 * Pointer to the leaf entries embedded in a data block (1-block format)
 */
#define	XFS_DIR2_BLOCK_LEAF_P(btp)	xfs_dir2_block_leaf_p(btp)
static inline struct xfs_dir2_leaf_entry *
xfs_dir2_block_leaf_p(xfs_dir2_block_tail_t *btp)
{
	return (((struct xfs_dir2_leaf_entry *)
		(btp)) - INT_GET((btp)->count, ARCH_CONVERT));
}

/*
 * Function declarations.
 */
extern int xfs_dir2_block_addname(struct xfs_da_args *args);
extern int xfs_dir2_block_getdents(struct xfs_trans *tp, struct xfs_inode *dp,
				   struct uio *uio, int *eofp,
				   struct xfs_dirent *dbp, xfs_dir2_put_t put);
extern int xfs_dir2_block_lookup(struct xfs_da_args *args);
extern int xfs_dir2_block_removename(struct xfs_da_args *args);
extern int xfs_dir2_block_replace(struct xfs_da_args *args);
extern int xfs_dir2_leaf_to_block(struct xfs_da_args *args,
				  struct xfs_dabuf *lbp, struct xfs_dabuf *dbp);
extern int xfs_dir2_sf_to_block(struct xfs_da_args *args);

#endif	/* __XFS_DIR2_BLOCK_H__ */