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2 * Copyright (c) 2000,2005 Silicon Graphics, Inc.
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.
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.
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
18 #ifndef __XFS_DIR2_NODE_H__
19 #define __XFS_DIR2_NODE_H__
22 * Directory version 2, btree node format structures
29 struct xfs_da_state_blk
;
34 * Offset of the freespace index.
36 #define XFS_DIR2_FREE_SPACE 2
37 #define XFS_DIR2_FREE_OFFSET (XFS_DIR2_FREE_SPACE * XFS_DIR2_SPACE_SIZE)
38 #define XFS_DIR2_FREE_FIRSTDB(mp) \
39 xfs_dir2_byte_to_db(mp, XFS_DIR2_FREE_OFFSET)
41 #define XFS_DIR2_FREE_MAGIC 0x58443246 /* XD2F */
43 typedef struct xfs_dir2_free_hdr
{
44 __be32 magic
; /* XFS_DIR2_FREE_MAGIC */
45 __be32 firstdb
; /* db of first entry */
46 __be32 nvalid
; /* count of valid entries */
47 __be32 nused
; /* count of used entries */
48 } xfs_dir2_free_hdr_t
;
50 typedef struct xfs_dir2_free
{
51 xfs_dir2_free_hdr_t hdr
; /* block header */
52 __be16 bests
[1]; /* best free counts */
53 /* unused entries are -1 */
56 #define XFS_DIR2_MAX_FREE_BESTS(mp) \
57 (((mp)->m_dirblksize - (uint)sizeof(xfs_dir2_free_hdr_t)) / \
58 (uint)sizeof(xfs_dir2_data_off_t))
61 * Convert data space db to the corresponding free db.
63 static inline xfs_dir2_db_t
64 xfs_dir2_db_to_fdb(struct xfs_mount
*mp
, xfs_dir2_db_t db
)
66 return (XFS_DIR2_FREE_FIRSTDB(mp
) + (db
) / XFS_DIR2_MAX_FREE_BESTS(mp
));
70 * Convert data space db to the corresponding index in a free db.
73 xfs_dir2_db_to_fdindex(struct xfs_mount
*mp
, xfs_dir2_db_t db
)
75 return ((db
) % XFS_DIR2_MAX_FREE_BESTS(mp
));
78 extern int xfs_dir2_leaf_to_node(struct xfs_da_args
*args
,
79 struct xfs_dabuf
*lbp
);
80 extern xfs_dahash_t
xfs_dir2_leafn_lasthash(struct xfs_dabuf
*bp
, int *count
);
81 extern int xfs_dir2_leafn_lookup_int(struct xfs_dabuf
*bp
,
82 struct xfs_da_args
*args
, int *indexp
,
83 struct xfs_da_state
*state
);
84 extern int xfs_dir2_leafn_order(struct xfs_dabuf
*leaf1_bp
,
85 struct xfs_dabuf
*leaf2_bp
);
86 extern int xfs_dir2_leafn_split(struct xfs_da_state
*state
,
87 struct xfs_da_state_blk
*oldblk
,
88 struct xfs_da_state_blk
*newblk
);
89 extern int xfs_dir2_leafn_toosmall(struct xfs_da_state
*state
, int *action
);
90 extern void xfs_dir2_leafn_unbalance(struct xfs_da_state
*state
,
91 struct xfs_da_state_blk
*drop_blk
,
92 struct xfs_da_state_blk
*save_blk
);
93 extern int xfs_dir2_node_addname(struct xfs_da_args
*args
);
94 extern int xfs_dir2_node_lookup(struct xfs_da_args
*args
);
95 extern int xfs_dir2_node_removename(struct xfs_da_args
*args
);
96 extern int xfs_dir2_node_replace(struct xfs_da_args
*args
);
97 extern int xfs_dir2_node_trim_free(struct xfs_da_args
*args
, xfs_fileoff_t fo
,
100 #endif /* __XFS_DIR2_NODE_H__ */