1/*
2 * Copyright (c) 2000-2001,2005 Silicon Graphics, Inc.
3 * All Rights Reserved.
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
7 * published by the Free Software Foundation.
8 *
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.
13 *
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
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
26struct uio;
27struct xfs_dabuf;
28struct xfs_da_args;
29struct xfs_dir2_data_hdr;
30struct xfs_dir2_leaf_entry;
31struct xfs_inode;
32struct xfs_mount;
33struct 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
45typedef struct xfs_dir2_block_tail {
46	__be32		count;			/* count of leaf entries */
47	__be32		stale;			/* count of stale lf entries */
48} xfs_dir2_block_tail_t;
49
50/*
51 * Generic single-block structure, for xfs_db.
52 */
53typedef 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 */
63#define	XFS_DIR2_BLOCK_TAIL_P(mp,block)	xfs_dir2_block_tail_p(mp,block)
64static inline xfs_dir2_block_tail_t *
65xfs_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}
70
71/*
72 * Pointer to the leaf entries embedded in a data block (1-block format)
73 */
74#define	XFS_DIR2_BLOCK_LEAF_P(btp)	xfs_dir2_block_leaf_p(btp)
75static inline struct xfs_dir2_leaf_entry *
76xfs_dir2_block_leaf_p(xfs_dir2_block_tail_t *btp)
77{
78	return ((struct xfs_dir2_leaf_entry *)btp) - be32_to_cpu(btp->count);
79}
80
81/*
82 * Function declarations.
83 */
84extern int xfs_dir2_block_addname(struct xfs_da_args *args);
85extern 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);
88extern int xfs_dir2_block_lookup(struct xfs_da_args *args);
89extern int xfs_dir2_block_removename(struct xfs_da_args *args);
90extern int xfs_dir2_block_replace(struct xfs_da_args *args);
91extern int xfs_dir2_leaf_to_block(struct xfs_da_args *args,
92				  struct xfs_dabuf *lbp, struct xfs_dabuf *dbp);
93extern int xfs_dir2_sf_to_block(struct xfs_da_args *args);
94
95#endif	/* __XFS_DIR2_BLOCK_H__ */
96