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1da177e4 | 1 | /* |
7b718769 NS |
2 | * Copyright (c) 2000,2005 Silicon Graphics, Inc. |
3 | * All Rights Reserved. | |
1da177e4 | 4 | * |
7b718769 NS |
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 | |
1da177e4 LT |
7 | * published by the Free Software Foundation. |
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_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 | ||
1da177e4 LT |
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) \ | |
bbaaf538 | 39 | xfs_dir2_byte_to_db(mp, XFS_DIR2_FREE_OFFSET) |
1da177e4 LT |
40 | |
41 | #define XFS_DIR2_FREE_MAGIC 0x58443246 /* XD2F */ | |
42 | ||
1da177e4 | 43 | typedef struct xfs_dir2_free_hdr { |
0ba962ef NS |
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 */ | |
1da177e4 LT |
48 | } xfs_dir2_free_hdr_t; |
49 | ||
50 | typedef struct xfs_dir2_free { | |
51 | xfs_dir2_free_hdr_t hdr; /* block header */ | |
0ba962ef | 52 | __be16 bests[1]; /* best free counts */ |
1da177e4 LT |
53 | /* unused entries are -1 */ |
54 | } xfs_dir2_free_t; | |
a844f451 | 55 | |
1da177e4 LT |
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 | ||
1da177e4 LT |
60 | /* |
61 | * Convert data space db to the corresponding free db. | |
62 | */ | |
a844f451 NS |
63 | static inline xfs_dir2_db_t |
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 | } | |
1da177e4 LT |
68 | |
69 | /* | |
70 | * Convert data space db to the corresponding index in a free db. | |
71 | */ | |
a844f451 NS |
72 | static inline int |
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 void xfs_dir2_free_log_bests(struct xfs_trans *tp, struct xfs_dabuf *bp, | |
79 | int first, int last); | |
80 | extern int xfs_dir2_leaf_to_node(struct xfs_da_args *args, | |
81 | struct xfs_dabuf *lbp); | |
82 | extern xfs_dahash_t xfs_dir2_leafn_lasthash(struct xfs_dabuf *bp, int *count); | |
83 | extern int xfs_dir2_leafn_lookup_int(struct xfs_dabuf *bp, | |
84 | struct xfs_da_args *args, int *indexp, | |
85 | struct xfs_da_state *state); | |
86 | extern int xfs_dir2_leafn_order(struct xfs_dabuf *leaf1_bp, | |
87 | struct xfs_dabuf *leaf2_bp); | |
88 | extern int xfs_dir2_leafn_split(struct xfs_da_state *state, | |
89 | struct xfs_da_state_blk *oldblk, | |
90 | struct xfs_da_state_blk *newblk); | |
91 | extern int xfs_dir2_leafn_toosmall(struct xfs_da_state *state, int *action); | |
92 | extern void xfs_dir2_leafn_unbalance(struct xfs_da_state *state, | |
93 | struct xfs_da_state_blk *drop_blk, | |
94 | struct xfs_da_state_blk *save_blk); | |
95 | extern int xfs_dir2_node_addname(struct xfs_da_args *args); | |
96 | extern int xfs_dir2_node_lookup(struct xfs_da_args *args); | |
97 | extern int xfs_dir2_node_removename(struct xfs_da_args *args); | |
98 | extern int xfs_dir2_node_replace(struct xfs_da_args *args); | |
99 | extern int xfs_dir2_node_trim_free(struct xfs_da_args *args, xfs_fileoff_t fo, | |
100 | int *rvalp); | |
1da177e4 LT |
101 | |
102 | #endif /* __XFS_DIR2_NODE_H__ */ |