]>
Commit | Line | Data |
---|---|---|
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 | ||
2282396d CH |
21 | /* |
22 | * Directory format 2, leaf block structures. | |
23 | * | |
24 | * A pure data block looks like the following drawing on disk: | |
25 | * | |
26 | * +---------------------------+ | |
27 | * | xfs_dir2_leaf_hdr_t | | |
28 | * +---------------------------+ | |
29 | * | xfs_dir2_leaf_entry_t | | |
30 | * | xfs_dir2_leaf_entry_t | | |
31 | * | xfs_dir2_leaf_entry_t | | |
32 | * | xfs_dir2_leaf_entry_t | | |
33 | * | ... | | |
34 | * +---------------------------+ | |
35 | * | xfs_dir2_data_off_t | | |
36 | * | xfs_dir2_data_off_t | | |
37 | * | xfs_dir2_data_off_t | | |
38 | * | ... | | |
39 | * +---------------------------+ | |
40 | * | xfs_dir2_leaf_tail_t | | |
41 | * +---------------------------+ | |
42 | * | |
43 | * The bests (xfs_dir2_data_off_t members) and tail are at the end of the | |
44 | * block for single-leaf only (magic = XFS_DIR2_LEAF1_MAGIC not | |
45 | * XFS_DIR2_LEAFN_MAGIC). | |
46 | * | |
47 | * As all the entries are variable size structures the accessors in this | |
48 | * file should be used to iterate over them. | |
49 | */ | |
50 | ||
1da177e4 LT |
51 | struct uio; |
52 | struct xfs_dabuf; | |
53 | struct xfs_da_args; | |
54 | struct xfs_inode; | |
55 | struct xfs_mount; | |
56 | struct xfs_trans; | |
57 | ||
1da177e4 LT |
58 | /* |
59 | * Offset of the leaf/node space. First block in this space | |
60 | * is the btree root. | |
61 | */ | |
62 | #define XFS_DIR2_LEAF_SPACE 1 | |
63 | #define XFS_DIR2_LEAF_OFFSET (XFS_DIR2_LEAF_SPACE * XFS_DIR2_SPACE_SIZE) | |
64 | #define XFS_DIR2_LEAF_FIRSTDB(mp) \ | |
bbaaf538 | 65 | xfs_dir2_byte_to_db(mp, XFS_DIR2_LEAF_OFFSET) |
1da177e4 | 66 | |
1da177e4 LT |
67 | /* |
68 | * Offset in data space of a data entry. | |
69 | */ | |
70 | typedef __uint32_t xfs_dir2_dataptr_t; | |
71 | #define XFS_DIR2_MAX_DATAPTR ((xfs_dir2_dataptr_t)0xffffffff) | |
72 | #define XFS_DIR2_NULL_DATAPTR ((xfs_dir2_dataptr_t)0) | |
73 | ||
1da177e4 LT |
74 | /* |
75 | * Leaf block header. | |
76 | */ | |
77 | typedef struct xfs_dir2_leaf_hdr { | |
78 | xfs_da_blkinfo_t info; /* header for da routines */ | |
a818e5de NS |
79 | __be16 count; /* count of entries */ |
80 | __be16 stale; /* count of stale entries */ | |
1da177e4 LT |
81 | } xfs_dir2_leaf_hdr_t; |
82 | ||
83 | /* | |
84 | * Leaf block entry. | |
85 | */ | |
86 | typedef struct xfs_dir2_leaf_entry { | |
3c1f9c15 NS |
87 | __be32 hashval; /* hash value of name */ |
88 | __be32 address; /* address of data entry */ | |
1da177e4 LT |
89 | } xfs_dir2_leaf_entry_t; |
90 | ||
91 | /* | |
92 | * Leaf block tail. | |
93 | */ | |
94 | typedef struct xfs_dir2_leaf_tail { | |
afbcb3f9 | 95 | __be32 bestcount; |
1da177e4 LT |
96 | } xfs_dir2_leaf_tail_t; |
97 | ||
98 | /* | |
99 | * Leaf block. | |
1da177e4 LT |
100 | */ |
101 | typedef struct xfs_dir2_leaf { | |
102 | xfs_dir2_leaf_hdr_t hdr; /* leaf header */ | |
2282396d | 103 | xfs_dir2_leaf_entry_t ents[]; /* entries */ |
1da177e4 LT |
104 | } xfs_dir2_leaf_t; |
105 | ||
106 | /* | |
a844f451 | 107 | * DB blocks here are logical directory block numbers, not filesystem blocks. |
1da177e4 LT |
108 | */ |
109 | ||
a844f451 NS |
110 | static inline int xfs_dir2_max_leaf_ents(struct xfs_mount *mp) |
111 | { | |
112 | return (int)(((mp)->m_dirblksize - (uint)sizeof(xfs_dir2_leaf_hdr_t)) / | |
113 | (uint)sizeof(xfs_dir2_leaf_entry_t)); | |
114 | } | |
1da177e4 LT |
115 | |
116 | /* | |
117 | * Get address of the bestcount field in the single-leaf block. | |
118 | */ | |
a844f451 NS |
119 | static inline xfs_dir2_leaf_tail_t * |
120 | xfs_dir2_leaf_tail_p(struct xfs_mount *mp, xfs_dir2_leaf_t *lp) | |
121 | { | |
122 | return (xfs_dir2_leaf_tail_t *) | |
123 | ((char *)(lp) + (mp)->m_dirblksize - | |
124 | (uint)sizeof(xfs_dir2_leaf_tail_t)); | |
125 | } | |
1da177e4 LT |
126 | |
127 | /* | |
128 | * Get address of the bests array in the single-leaf block. | |
129 | */ | |
68b3a102 | 130 | static inline __be16 * |
a844f451 NS |
131 | xfs_dir2_leaf_bests_p(xfs_dir2_leaf_tail_t *ltp) |
132 | { | |
afbcb3f9 | 133 | return (__be16 *)ltp - be32_to_cpu(ltp->bestcount); |
a844f451 | 134 | } |
1da177e4 LT |
135 | |
136 | /* | |
137 | * Convert dataptr to byte in file space | |
138 | */ | |
a844f451 NS |
139 | static inline xfs_dir2_off_t |
140 | xfs_dir2_dataptr_to_byte(struct xfs_mount *mp, xfs_dir2_dataptr_t dp) | |
141 | { | |
142 | return (xfs_dir2_off_t)(dp) << XFS_DIR2_DATA_ALIGN_LOG; | |
143 | } | |
1da177e4 LT |
144 | |
145 | /* | |
146 | * Convert byte in file space to dataptr. It had better be aligned. | |
147 | */ | |
a844f451 NS |
148 | static inline xfs_dir2_dataptr_t |
149 | xfs_dir2_byte_to_dataptr(struct xfs_mount *mp, xfs_dir2_off_t by) | |
150 | { | |
151 | return (xfs_dir2_dataptr_t)((by) >> XFS_DIR2_DATA_ALIGN_LOG); | |
152 | } | |
153 | ||
154 | /* | |
155 | * Convert byte in space to (DB) block | |
156 | */ | |
a844f451 NS |
157 | static inline xfs_dir2_db_t |
158 | xfs_dir2_byte_to_db(struct xfs_mount *mp, xfs_dir2_off_t by) | |
159 | { | |
160 | return (xfs_dir2_db_t)((by) >> \ | |
161 | ((mp)->m_sb.sb_blocklog + (mp)->m_sb.sb_dirblklog)); | |
162 | } | |
1da177e4 LT |
163 | |
164 | /* | |
165 | * Convert dataptr to a block number | |
166 | */ | |
a844f451 NS |
167 | static inline xfs_dir2_db_t |
168 | xfs_dir2_dataptr_to_db(struct xfs_mount *mp, xfs_dir2_dataptr_t dp) | |
169 | { | |
bbaaf538 | 170 | return xfs_dir2_byte_to_db(mp, xfs_dir2_dataptr_to_byte(mp, dp)); |
a844f451 NS |
171 | } |
172 | ||
173 | /* | |
174 | * Convert byte in space to offset in a block | |
175 | */ | |
a844f451 NS |
176 | static inline xfs_dir2_data_aoff_t |
177 | xfs_dir2_byte_to_off(struct xfs_mount *mp, xfs_dir2_off_t by) | |
178 | { | |
179 | return (xfs_dir2_data_aoff_t)((by) & \ | |
180 | ((1 << ((mp)->m_sb.sb_blocklog + (mp)->m_sb.sb_dirblklog)) - 1)); | |
181 | } | |
1da177e4 LT |
182 | |
183 | /* | |
184 | * Convert dataptr to a byte offset in a block | |
185 | */ | |
a844f451 NS |
186 | static inline xfs_dir2_data_aoff_t |
187 | xfs_dir2_dataptr_to_off(struct xfs_mount *mp, xfs_dir2_dataptr_t dp) | |
188 | { | |
bbaaf538 | 189 | return xfs_dir2_byte_to_off(mp, xfs_dir2_dataptr_to_byte(mp, dp)); |
a844f451 | 190 | } |
1da177e4 LT |
191 | |
192 | /* | |
193 | * Convert block and offset to byte in space | |
194 | */ | |
a844f451 NS |
195 | static inline xfs_dir2_off_t |
196 | xfs_dir2_db_off_to_byte(struct xfs_mount *mp, xfs_dir2_db_t db, | |
197 | xfs_dir2_data_aoff_t o) | |
198 | { | |
199 | return ((xfs_dir2_off_t)(db) << \ | |
200 | ((mp)->m_sb.sb_blocklog + (mp)->m_sb.sb_dirblklog)) + (o); | |
201 | } | |
1da177e4 LT |
202 | |
203 | /* | |
a844f451 | 204 | * Convert block (DB) to block (dablk) |
1da177e4 | 205 | */ |
a844f451 NS |
206 | static inline xfs_dablk_t |
207 | xfs_dir2_db_to_da(struct xfs_mount *mp, xfs_dir2_db_t db) | |
208 | { | |
209 | return (xfs_dablk_t)((db) << (mp)->m_sb.sb_dirblklog); | |
210 | } | |
1da177e4 LT |
211 | |
212 | /* | |
213 | * Convert byte in space to (DA) block | |
214 | */ | |
a844f451 NS |
215 | static inline xfs_dablk_t |
216 | xfs_dir2_byte_to_da(struct xfs_mount *mp, xfs_dir2_off_t by) | |
217 | { | |
bbaaf538 | 218 | return xfs_dir2_db_to_da(mp, xfs_dir2_byte_to_db(mp, by)); |
a844f451 | 219 | } |
1da177e4 LT |
220 | |
221 | /* | |
222 | * Convert block and offset to dataptr | |
223 | */ | |
a844f451 NS |
224 | static inline xfs_dir2_dataptr_t |
225 | xfs_dir2_db_off_to_dataptr(struct xfs_mount *mp, xfs_dir2_db_t db, | |
226 | xfs_dir2_data_aoff_t o) | |
227 | { | |
bbaaf538 | 228 | return xfs_dir2_byte_to_dataptr(mp, xfs_dir2_db_off_to_byte(mp, db, o)); |
a844f451 | 229 | } |
1da177e4 LT |
230 | |
231 | /* | |
232 | * Convert block (dablk) to block (DB) | |
233 | */ | |
a844f451 NS |
234 | static inline xfs_dir2_db_t |
235 | xfs_dir2_da_to_db(struct xfs_mount *mp, xfs_dablk_t da) | |
236 | { | |
237 | return (xfs_dir2_db_t)((da) >> (mp)->m_sb.sb_dirblklog); | |
238 | } | |
1da177e4 LT |
239 | |
240 | /* | |
241 | * Convert block (dablk) to byte offset in space | |
242 | */ | |
a844f451 NS |
243 | static inline xfs_dir2_off_t |
244 | xfs_dir2_da_to_byte(struct xfs_mount *mp, xfs_dablk_t da) | |
245 | { | |
bbaaf538 | 246 | return xfs_dir2_db_off_to_byte(mp, xfs_dir2_da_to_db(mp, da), 0); |
a844f451 | 247 | } |
1da177e4 LT |
248 | |
249 | /* | |
250 | * Function declarations. | |
251 | */ | |
a844f451 NS |
252 | extern int xfs_dir2_block_to_leaf(struct xfs_da_args *args, |
253 | struct xfs_dabuf *dbp); | |
254 | extern int xfs_dir2_leaf_addname(struct xfs_da_args *args); | |
255 | extern void xfs_dir2_leaf_compact(struct xfs_da_args *args, | |
256 | struct xfs_dabuf *bp); | |
257 | extern void xfs_dir2_leaf_compact_x1(struct xfs_dabuf *bp, int *indexp, | |
258 | int *lowstalep, int *highstalep, | |
259 | int *lowlogp, int *highlogp); | |
051e7cd4 CH |
260 | extern int xfs_dir2_leaf_getdents(struct xfs_inode *dp, void *dirent, |
261 | size_t bufsize, xfs_off_t *offset, | |
262 | filldir_t filldir); | |
a844f451 NS |
263 | extern int xfs_dir2_leaf_init(struct xfs_da_args *args, xfs_dir2_db_t bno, |
264 | struct xfs_dabuf **bpp, int magic); | |
265 | extern void xfs_dir2_leaf_log_ents(struct xfs_trans *tp, struct xfs_dabuf *bp, | |
266 | int first, int last); | |
267 | extern void xfs_dir2_leaf_log_header(struct xfs_trans *tp, | |
268 | struct xfs_dabuf *bp); | |
269 | extern int xfs_dir2_leaf_lookup(struct xfs_da_args *args); | |
270 | extern int xfs_dir2_leaf_removename(struct xfs_da_args *args); | |
271 | extern int xfs_dir2_leaf_replace(struct xfs_da_args *args); | |
272 | extern int xfs_dir2_leaf_search_hash(struct xfs_da_args *args, | |
273 | struct xfs_dabuf *lbp); | |
274 | extern int xfs_dir2_leaf_trim_data(struct xfs_da_args *args, | |
275 | struct xfs_dabuf *lbp, xfs_dir2_db_t db); | |
4fb44c82 CH |
276 | extern xfs_dir2_leaf_entry_t *xfs_dir2_leaf_find_entry(xfs_dir2_leaf_t *, int, |
277 | int, int, int, | |
278 | int *, int *); | |
a844f451 | 279 | extern int xfs_dir2_node_to_leaf(struct xfs_da_state *state); |
1da177e4 LT |
280 | |
281 | #endif /* __XFS_DIR2_LEAF_H__ */ |