[linux-2.6-block.git] / fs / xfs / xfs_dir2_block.h

/*
 * Copyright (c) 2000-2001,2005 Silicon Graphics, Inc.
 * All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms 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.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write the Free Software Foundation,
 * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */
#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 {
	__be32		count;			/* count of leaf entries */
	__be32		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) - be32_to_cpu(btp->count);
}

/*
 * 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__ */
Commit	Line	Data
1da177e4	1	/*
7b718769 NS	2	* Copyright (c) 2000-2001,2005 Silicon Graphics, Inc.
7b718769 NS	3	* All Rights Reserved.
1da177e4	4	*
7b718769 NS	5	* This program is free software; you can redistribute it and/or
7b718769 NS	6	* modify it under the terms of the GNU General Public License as
1da177e4 LT	7	* published by the Free Software Foundation.
1da177e4 LT	8	*
7b718769 NS	9	* This program is distributed in the hope that it would be useful,
	10	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	11	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	12	* GNU General Public License for more details.
1da177e4	13	*
7b718769 NS	14	* You should have received a copy of the GNU General Public License
	15	* along with this program; if not, write the Free Software Foundation,
	16	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
1da177e4 LT	17	*/
	18	#ifndef __XFS_DIR2_BLOCK_H__
	19	#define __XFS_DIR2_BLOCK_H__
	20
	21	/*
	22	* xfs_dir2_block.h
	23	* Directory version 2, single block format structures
	24	*/
	25
	26	struct uio;
	27	struct xfs_dabuf;
	28	struct xfs_da_args;
	29	struct xfs_dir2_data_hdr;
	30	struct xfs_dir2_leaf_entry;
	31	struct xfs_inode;
	32	struct xfs_mount;
	33	struct xfs_trans;
	34
	35	/*
	36	* The single block format is as follows:
	37	* xfs_dir2_data_hdr_t structure
	38	* xfs_dir2_data_entry_t and xfs_dir2_data_unused_t structures
	39	* xfs_dir2_leaf_entry_t structures
	40	* xfs_dir2_block_tail_t structure
	41	*/
	42
	43	#define XFS_DIR2_BLOCK_MAGIC 0x58443242 /* XD2B: for one block dirs */
	44
	45	typedef struct xfs_dir2_block_tail {
e922fffa NS	46	__be32 count; /* count of leaf entries */
e922fffa NS	47	__be32 stale; /* count of stale lf entries */
1da177e4 LT	48	} xfs_dir2_block_tail_t;
	49
	50	/*
	51	* Generic single-block structure, for xfs_db.
	52	*/
	53	typedef struct xfs_dir2_block {
	54	xfs_dir2_data_hdr_t hdr; /* magic XFS_DIR2_BLOCK_MAGIC */
	55	xfs_dir2_data_union_t u[1];
	56	xfs_dir2_leaf_entry_t leaf[1];
	57	xfs_dir2_block_tail_t tail;
	58	} xfs_dir2_block_t;
	59
	60	/*
	61	* Pointer to the leaf header embedded in a data block (1-block format)
	62	*/
1da177e4	63	#define XFS_DIR2_BLOCK_TAIL_P(mp,block) xfs_dir2_block_tail_p(mp,block)
a844f451 NS	64	static inline xfs_dir2_block_tail_t *
	65	xfs_dir2_block_tail_p(struct xfs_mount mp, xfs_dir2_block_t block)
	66	{
	67	return (((xfs_dir2_block_tail_t *)
	68	((char *)(block) + (mp)->m_dirblksize)) - 1);
	69	}
1da177e4 LT	70
	71	/*
	72	* Pointer to the leaf entries embedded in a data block (1-block format)
	73	*/
a844f451 NS	74	#define XFS_DIR2_BLOCK_LEAF_P(btp) xfs_dir2_block_leaf_p(btp)
	75	static inline struct xfs_dir2_leaf_entry *
	76	xfs_dir2_block_leaf_p(xfs_dir2_block_tail_t *btp)
	77	{
e922fffa	78	return ((struct xfs_dir2_leaf_entry *)btp) - be32_to_cpu(btp->count);
a844f451	79	}
1da177e4 LT	80
	81	/*
	82	* Function declarations.
	83	*/
a844f451 NS	84	extern int xfs_dir2_block_addname(struct xfs_da_args *args);
	85	extern int xfs_dir2_block_getdents(struct xfs_trans tp, struct xfs_inode dp,
	86	struct uio uio, int eofp,
	87	struct xfs_dirent *dbp, xfs_dir2_put_t put);
	88	extern int xfs_dir2_block_lookup(struct xfs_da_args *args);
	89	extern int xfs_dir2_block_removename(struct xfs_da_args *args);
	90	extern int xfs_dir2_block_replace(struct xfs_da_args *args);
	91	extern int xfs_dir2_leaf_to_block(struct xfs_da_args *args,
	92	struct xfs_dabuf lbp, struct xfs_dabuf dbp);
	93	extern int xfs_dir2_sf_to_block(struct xfs_da_args *args);
1da177e4 LT	94
1da177e4 LT	95	#endif /* __XFS_DIR2_BLOCK_H__ */