1 /*
2 * Copyright (c) 2000,2005 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_NODE_H__
19 #define __XFS_DIR2_NODE_H__
20
21 /*
22 * Directory version 2, btree node format structures
23 */
24
25 struct uio;
26 struct xfs_dabuf;
27 struct xfs_da_args;
28 struct xfs_da_state;
29 struct xfs_da_state_blk;
30 struct xfs_inode;
31 struct xfs_trans;
32
33 /*
34 * Offset of the freespace index.
35 */
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)
40
41 #define XFS_DIR2_FREE_MAGIC 0x58443246 /* XD2F */
42
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;
49
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 */
54 } xfs_dir2_free_t;
55
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))
59
60 /*
61 * Convert data space db to the corresponding free db.
62 */
63 static inline xfs_dir2_db_t
xfs_dir2_db_to_fdb(struct xfs_mount * mp,xfs_dir2_db_t db)64 xfs_dir2_db_to_fdb(struct xfs_mount *mp, xfs_dir2_db_t db)
65 {
66 return (XFS_DIR2_FREE_FIRSTDB(mp) + (db) / XFS_DIR2_MAX_FREE_BESTS(mp));
67 }
68
69 /*
70 * Convert data space db to the corresponding index in a free db.
71 */
72 static inline int
xfs_dir2_db_to_fdindex(struct xfs_mount * mp,xfs_dir2_db_t db)73 xfs_dir2_db_to_fdindex(struct xfs_mount *mp, xfs_dir2_db_t db)
74 {
75 return ((db) % XFS_DIR2_MAX_FREE_BESTS(mp));
76 }
77
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,
98 int *rvalp);
99
100 #endif /* __XFS_DIR2_NODE_H__ */
101