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1da177e4 | 1 | /* |
7b718769 NS |
2 | * Copyright (c) 2000-2001,2005 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_LEAF_H__ | |
19 | #define __XFS_DIR2_LEAF_H__ | |
20 | ||
1da177e4 LT |
21 | struct uio; |
22 | struct xfs_dabuf; | |
23 | struct xfs_da_args; | |
24 | struct xfs_inode; | |
25 | struct xfs_mount; | |
26 | struct xfs_trans; | |
27 | ||
1da177e4 LT |
28 | /* |
29 | * Offset of the leaf/node space. First block in this space | |
30 | * is the btree root. | |
31 | */ | |
32 | #define XFS_DIR2_LEAF_SPACE 1 | |
33 | #define XFS_DIR2_LEAF_OFFSET (XFS_DIR2_LEAF_SPACE * XFS_DIR2_SPACE_SIZE) | |
34 | #define XFS_DIR2_LEAF_FIRSTDB(mp) \ | |
35 | XFS_DIR2_BYTE_TO_DB(mp, XFS_DIR2_LEAF_OFFSET) | |
36 | ||
1da177e4 LT |
37 | /* |
38 | * Offset in data space of a data entry. | |
39 | */ | |
40 | typedef __uint32_t xfs_dir2_dataptr_t; | |
41 | #define XFS_DIR2_MAX_DATAPTR ((xfs_dir2_dataptr_t)0xffffffff) | |
42 | #define XFS_DIR2_NULL_DATAPTR ((xfs_dir2_dataptr_t)0) | |
43 | ||
1da177e4 LT |
44 | /* |
45 | * Leaf block header. | |
46 | */ | |
47 | typedef struct xfs_dir2_leaf_hdr { | |
48 | xfs_da_blkinfo_t info; /* header for da routines */ | |
a818e5de NS |
49 | __be16 count; /* count of entries */ |
50 | __be16 stale; /* count of stale entries */ | |
1da177e4 LT |
51 | } xfs_dir2_leaf_hdr_t; |
52 | ||
53 | /* | |
54 | * Leaf block entry. | |
55 | */ | |
56 | typedef struct xfs_dir2_leaf_entry { | |
3c1f9c15 NS |
57 | __be32 hashval; /* hash value of name */ |
58 | __be32 address; /* address of data entry */ | |
1da177e4 LT |
59 | } xfs_dir2_leaf_entry_t; |
60 | ||
61 | /* | |
62 | * Leaf block tail. | |
63 | */ | |
64 | typedef struct xfs_dir2_leaf_tail { | |
afbcb3f9 | 65 | __be32 bestcount; |
1da177e4 LT |
66 | } xfs_dir2_leaf_tail_t; |
67 | ||
68 | /* | |
69 | * Leaf block. | |
70 | * bests and tail are at the end of the block for single-leaf only | |
71 | * (magic = XFS_DIR2_LEAF1_MAGIC not XFS_DIR2_LEAFN_MAGIC). | |
72 | */ | |
73 | typedef struct xfs_dir2_leaf { | |
74 | xfs_dir2_leaf_hdr_t hdr; /* leaf header */ | |
75 | xfs_dir2_leaf_entry_t ents[1]; /* entries */ | |
76 | /* ... */ | |
77 | xfs_dir2_data_off_t bests[1]; /* best free counts */ | |
78 | xfs_dir2_leaf_tail_t tail; /* leaf tail */ | |
79 | } xfs_dir2_leaf_t; | |
80 | ||
81 | /* | |
a844f451 | 82 | * DB blocks here are logical directory block numbers, not filesystem blocks. |
1da177e4 LT |
83 | */ |
84 | ||
a844f451 NS |
85 | #define XFS_DIR2_MAX_LEAF_ENTS(mp) xfs_dir2_max_leaf_ents(mp) |
86 | static inline int xfs_dir2_max_leaf_ents(struct xfs_mount *mp) | |
87 | { | |
88 | return (int)(((mp)->m_dirblksize - (uint)sizeof(xfs_dir2_leaf_hdr_t)) / | |
89 | (uint)sizeof(xfs_dir2_leaf_entry_t)); | |
90 | } | |
1da177e4 LT |
91 | |
92 | /* | |
93 | * Get address of the bestcount field in the single-leaf block. | |
94 | */ | |
a844f451 NS |
95 | #define XFS_DIR2_LEAF_TAIL_P(mp,lp) xfs_dir2_leaf_tail_p(mp, lp) |
96 | static inline xfs_dir2_leaf_tail_t * | |
97 | xfs_dir2_leaf_tail_p(struct xfs_mount *mp, xfs_dir2_leaf_t *lp) | |
98 | { | |
99 | return (xfs_dir2_leaf_tail_t *) | |
100 | ((char *)(lp) + (mp)->m_dirblksize - | |
101 | (uint)sizeof(xfs_dir2_leaf_tail_t)); | |
102 | } | |
1da177e4 LT |
103 | |
104 | /* | |
105 | * Get address of the bests array in the single-leaf block. | |
106 | */ | |
1da177e4 | 107 | #define XFS_DIR2_LEAF_BESTS_P(ltp) xfs_dir2_leaf_bests_p(ltp) |
68b3a102 | 108 | static inline __be16 * |
a844f451 NS |
109 | xfs_dir2_leaf_bests_p(xfs_dir2_leaf_tail_t *ltp) |
110 | { | |
afbcb3f9 | 111 | return (__be16 *)ltp - be32_to_cpu(ltp->bestcount); |
a844f451 | 112 | } |
1da177e4 LT |
113 | |
114 | /* | |
115 | * Convert dataptr to byte in file space | |
116 | */ | |
1da177e4 | 117 | #define XFS_DIR2_DATAPTR_TO_BYTE(mp,dp) xfs_dir2_dataptr_to_byte(mp, dp) |
a844f451 NS |
118 | static inline xfs_dir2_off_t |
119 | xfs_dir2_dataptr_to_byte(struct xfs_mount *mp, xfs_dir2_dataptr_t dp) | |
120 | { | |
121 | return (xfs_dir2_off_t)(dp) << XFS_DIR2_DATA_ALIGN_LOG; | |
122 | } | |
1da177e4 LT |
123 | |
124 | /* | |
125 | * Convert byte in file space to dataptr. It had better be aligned. | |
126 | */ | |
1da177e4 | 127 | #define XFS_DIR2_BYTE_TO_DATAPTR(mp,by) xfs_dir2_byte_to_dataptr(mp,by) |
a844f451 NS |
128 | static inline xfs_dir2_dataptr_t |
129 | xfs_dir2_byte_to_dataptr(struct xfs_mount *mp, xfs_dir2_off_t by) | |
130 | { | |
131 | return (xfs_dir2_dataptr_t)((by) >> XFS_DIR2_DATA_ALIGN_LOG); | |
132 | } | |
133 | ||
134 | /* | |
135 | * Convert byte in space to (DB) block | |
136 | */ | |
137 | #define XFS_DIR2_BYTE_TO_DB(mp,by) xfs_dir2_byte_to_db(mp, by) | |
138 | static inline xfs_dir2_db_t | |
139 | xfs_dir2_byte_to_db(struct xfs_mount *mp, xfs_dir2_off_t by) | |
140 | { | |
141 | return (xfs_dir2_db_t)((by) >> \ | |
142 | ((mp)->m_sb.sb_blocklog + (mp)->m_sb.sb_dirblklog)); | |
143 | } | |
1da177e4 LT |
144 | |
145 | /* | |
146 | * Convert dataptr to a block number | |
147 | */ | |
1da177e4 | 148 | #define XFS_DIR2_DATAPTR_TO_DB(mp,dp) xfs_dir2_dataptr_to_db(mp, dp) |
a844f451 NS |
149 | static inline xfs_dir2_db_t |
150 | xfs_dir2_dataptr_to_db(struct xfs_mount *mp, xfs_dir2_dataptr_t dp) | |
151 | { | |
152 | return XFS_DIR2_BYTE_TO_DB(mp, XFS_DIR2_DATAPTR_TO_BYTE(mp, dp)); | |
153 | } | |
154 | ||
155 | /* | |
156 | * Convert byte in space to offset in a block | |
157 | */ | |
158 | #define XFS_DIR2_BYTE_TO_OFF(mp,by) xfs_dir2_byte_to_off(mp, by) | |
159 | static inline xfs_dir2_data_aoff_t | |
160 | xfs_dir2_byte_to_off(struct xfs_mount *mp, xfs_dir2_off_t by) | |
161 | { | |
162 | return (xfs_dir2_data_aoff_t)((by) & \ | |
163 | ((1 << ((mp)->m_sb.sb_blocklog + (mp)->m_sb.sb_dirblklog)) - 1)); | |
164 | } | |
1da177e4 LT |
165 | |
166 | /* | |
167 | * Convert dataptr to a byte offset in a block | |
168 | */ | |
1da177e4 | 169 | #define XFS_DIR2_DATAPTR_TO_OFF(mp,dp) xfs_dir2_dataptr_to_off(mp, dp) |
a844f451 NS |
170 | static inline xfs_dir2_data_aoff_t |
171 | xfs_dir2_dataptr_to_off(struct xfs_mount *mp, xfs_dir2_dataptr_t dp) | |
172 | { | |
173 | return XFS_DIR2_BYTE_TO_OFF(mp, XFS_DIR2_DATAPTR_TO_BYTE(mp, dp)); | |
174 | } | |
1da177e4 LT |
175 | |
176 | /* | |
177 | * Convert block and offset to byte in space | |
178 | */ | |
1da177e4 LT |
179 | #define XFS_DIR2_DB_OFF_TO_BYTE(mp,db,o) \ |
180 | xfs_dir2_db_off_to_byte(mp, db, o) | |
a844f451 NS |
181 | static inline xfs_dir2_off_t |
182 | xfs_dir2_db_off_to_byte(struct xfs_mount *mp, xfs_dir2_db_t db, | |
183 | xfs_dir2_data_aoff_t o) | |
184 | { | |
185 | return ((xfs_dir2_off_t)(db) << \ | |
186 | ((mp)->m_sb.sb_blocklog + (mp)->m_sb.sb_dirblklog)) + (o); | |
187 | } | |
1da177e4 LT |
188 | |
189 | /* | |
a844f451 | 190 | * Convert block (DB) to block (dablk) |
1da177e4 | 191 | */ |
a844f451 NS |
192 | #define XFS_DIR2_DB_TO_DA(mp,db) xfs_dir2_db_to_da(mp, db) |
193 | static inline xfs_dablk_t | |
194 | xfs_dir2_db_to_da(struct xfs_mount *mp, xfs_dir2_db_t db) | |
195 | { | |
196 | return (xfs_dablk_t)((db) << (mp)->m_sb.sb_dirblklog); | |
197 | } | |
1da177e4 LT |
198 | |
199 | /* | |
200 | * Convert byte in space to (DA) block | |
201 | */ | |
1da177e4 | 202 | #define XFS_DIR2_BYTE_TO_DA(mp,by) xfs_dir2_byte_to_da(mp, by) |
a844f451 NS |
203 | static inline xfs_dablk_t |
204 | xfs_dir2_byte_to_da(struct xfs_mount *mp, xfs_dir2_off_t by) | |
205 | { | |
206 | return XFS_DIR2_DB_TO_DA(mp, XFS_DIR2_BYTE_TO_DB(mp, by)); | |
207 | } | |
1da177e4 LT |
208 | |
209 | /* | |
210 | * Convert block and offset to dataptr | |
211 | */ | |
1da177e4 LT |
212 | #define XFS_DIR2_DB_OFF_TO_DATAPTR(mp,db,o) \ |
213 | xfs_dir2_db_off_to_dataptr(mp, db, o) | |
a844f451 NS |
214 | static inline xfs_dir2_dataptr_t |
215 | xfs_dir2_db_off_to_dataptr(struct xfs_mount *mp, xfs_dir2_db_t db, | |
216 | xfs_dir2_data_aoff_t o) | |
217 | { | |
218 | return XFS_DIR2_BYTE_TO_DATAPTR(mp, XFS_DIR2_DB_OFF_TO_BYTE(mp, db, o)); | |
219 | } | |
1da177e4 LT |
220 | |
221 | /* | |
222 | * Convert block (dablk) to block (DB) | |
223 | */ | |
1da177e4 | 224 | #define XFS_DIR2_DA_TO_DB(mp,da) xfs_dir2_da_to_db(mp, da) |
a844f451 NS |
225 | static inline xfs_dir2_db_t |
226 | xfs_dir2_da_to_db(struct xfs_mount *mp, xfs_dablk_t da) | |
227 | { | |
228 | return (xfs_dir2_db_t)((da) >> (mp)->m_sb.sb_dirblklog); | |
229 | } | |
1da177e4 LT |
230 | |
231 | /* | |
232 | * Convert block (dablk) to byte offset in space | |
233 | */ | |
1da177e4 | 234 | #define XFS_DIR2_DA_TO_BYTE(mp,da) xfs_dir2_da_to_byte(mp, da) |
a844f451 NS |
235 | static inline xfs_dir2_off_t |
236 | xfs_dir2_da_to_byte(struct xfs_mount *mp, xfs_dablk_t da) | |
237 | { | |
238 | return XFS_DIR2_DB_OFF_TO_BYTE(mp, XFS_DIR2_DA_TO_DB(mp, da), 0); | |
239 | } | |
1da177e4 LT |
240 | |
241 | /* | |
242 | * Function declarations. | |
243 | */ | |
a844f451 NS |
244 | extern int xfs_dir2_block_to_leaf(struct xfs_da_args *args, |
245 | struct xfs_dabuf *dbp); | |
246 | extern int xfs_dir2_leaf_addname(struct xfs_da_args *args); | |
247 | extern void xfs_dir2_leaf_compact(struct xfs_da_args *args, | |
248 | struct xfs_dabuf *bp); | |
249 | extern void xfs_dir2_leaf_compact_x1(struct xfs_dabuf *bp, int *indexp, | |
250 | int *lowstalep, int *highstalep, | |
251 | int *lowlogp, int *highlogp); | |
252 | extern int xfs_dir2_leaf_getdents(struct xfs_trans *tp, struct xfs_inode *dp, | |
253 | struct uio *uio, int *eofp, | |
254 | struct xfs_dirent *dbp, xfs_dir2_put_t put); | |
255 | extern int xfs_dir2_leaf_init(struct xfs_da_args *args, xfs_dir2_db_t bno, | |
256 | struct xfs_dabuf **bpp, int magic); | |
257 | extern void xfs_dir2_leaf_log_ents(struct xfs_trans *tp, struct xfs_dabuf *bp, | |
258 | int first, int last); | |
259 | extern void xfs_dir2_leaf_log_header(struct xfs_trans *tp, | |
260 | struct xfs_dabuf *bp); | |
261 | extern int xfs_dir2_leaf_lookup(struct xfs_da_args *args); | |
262 | extern int xfs_dir2_leaf_removename(struct xfs_da_args *args); | |
263 | extern int xfs_dir2_leaf_replace(struct xfs_da_args *args); | |
264 | extern int xfs_dir2_leaf_search_hash(struct xfs_da_args *args, | |
265 | struct xfs_dabuf *lbp); | |
266 | extern int xfs_dir2_leaf_trim_data(struct xfs_da_args *args, | |
267 | struct xfs_dabuf *lbp, xfs_dir2_db_t db); | |
268 | extern int xfs_dir2_node_to_leaf(struct xfs_da_state *state); | |
1da177e4 LT |
269 | |
270 | #endif /* __XFS_DIR2_LEAF_H__ */ |