1 /* TDB tools to create various canned database layouts. */
8 struct tdb_layout *new_tdb_layout(void)
10 struct tdb_layout *layout = malloc(sizeof(*layout));
11 layout->num_elems = 0;
13 layout->ftable = layout->htable = -1;
17 static void add(struct tdb_layout *layout, union tdb_layout_elem elem)
19 layout->elem = realloc(layout->elem,
20 sizeof(layout->elem[0])
21 * (layout->num_elems+1));
22 layout->elem[layout->num_elems++] = elem;
25 void tdb_layout_add_free(struct tdb_layout *layout, tdb_len_t len)
27 union tdb_layout_elem elem;
28 elem.base.type = FREE;
33 static struct tdb_data dup_key(struct tdb_data key)
36 ret.dsize = key.dsize;
37 ret.dptr = malloc(ret.dsize);
38 memcpy(ret.dptr, key.dptr, ret.dsize);
42 void tdb_layout_add_used(struct tdb_layout *layout,
43 TDB_DATA key, TDB_DATA data,
46 union tdb_layout_elem elem;
47 elem.base.type = DATA;
48 elem.used.key = dup_key(key);
49 elem.used.data = dup_key(data);
50 elem.used.extra = extra;
54 void tdb_layout_add_hashtable(struct tdb_layout *layout,
55 unsigned int hash_bits,
58 union tdb_layout_elem elem;
59 elem.base.type = HASHTABLE;
60 elem.hashtable.hash_bits = hash_bits;
61 elem.hashtable.extra = extra;
62 assert(layout->htable == -1U);
63 layout->htable = layout->num_elems;
67 void tdb_layout_add_freetable(struct tdb_layout *layout,
68 unsigned int num_zones,
69 unsigned int zone_bits,
70 unsigned int num_buckets,
73 union tdb_layout_elem elem;
74 elem.base.type = FREETABLE;
75 elem.freetable.num_zones = num_zones;
76 elem.freetable.zone_bits = zone_bits;
77 elem.freetable.num_buckets = num_buckets;
78 elem.freetable.extra = extra;
79 assert(layout->ftable == -1U);
80 layout->ftable = layout->num_elems;
84 static tdb_len_t free_record_len(tdb_len_t len)
86 return sizeof(struct tdb_used_record) + len;
89 static tdb_len_t data_record_len(struct tle_used *used)
92 len = sizeof(struct tdb_used_record)
93 + used->key.dsize + used->data.dsize + used->extra;
94 assert(len >= sizeof(struct tdb_free_record));
98 static tdb_len_t hashtable_len(struct tle_hashtable *htable)
100 return sizeof(struct tdb_used_record)
101 + (sizeof(tdb_off_t) << htable->hash_bits);
104 static tdb_len_t freetable_len(struct tle_freetable *ftable)
106 return sizeof(struct tdb_used_record)
107 + (sizeof(tdb_off_t) * ftable->num_zones
108 * (ftable->num_buckets + 1));
111 static void set_free_record(void *mem, tdb_len_t len)
113 /* We do all the work in add_to_freetable */
116 static void set_data_record(void *mem, struct tdb_context *tdb,
117 struct tle_used *used)
119 struct tdb_used_record *u = mem;
121 set_header(tdb, u, used->key.dsize, used->data.dsize,
122 used->key.dsize + used->data.dsize + used->extra,
123 tdb_hash(tdb, used->key.dptr, used->key.dsize));
124 memcpy(u + 1, used->key.dptr, used->key.dsize);
125 memcpy((char *)(u + 1) + used->key.dsize,
126 used->data.dptr, used->data.dsize);
129 static void set_hashtable(void *mem, struct tdb_context *tdb,
130 struct tle_hashtable *htable)
132 struct tdb_used_record *u = mem;
133 tdb_len_t len = sizeof(tdb_off_t) << htable->hash_bits;
135 set_header(tdb, u, 0, len, len + htable->extra, 0);
136 memset(u + 1, 0, len);
139 static void set_freetable(void *mem, struct tdb_context *tdb,
140 struct tle_freetable *ftable)
142 struct tdb_used_record *u = mem;
143 tdb_len_t len = sizeof(tdb_off_t) * ftable->num_zones
144 * (ftable->num_buckets + 1);
145 set_header(tdb, u, 0, len, len + ftable->extra, 0);
146 memset(u + 1, 0, len);
149 static void add_to_freetable(struct tdb_context *tdb,
153 add_free_record(tdb, eoff, sizeof(struct tdb_used_record) + elen);
156 static void add_to_hashtable(struct tdb_context *tdb,
160 uint64_t hash = tdb_hash(tdb, key.dptr, key.dsize);
163 while (tdb_read_off(tdb, hoff = hash_off(tdb, hash)) != 0)
166 tdb_write_off(tdb, hoff, eoff);
169 /* FIXME: Support TDB_CONVERT */
170 struct tdb_context *tdb_layout_get(struct tdb_layout *layout)
174 struct tdb_header *hdr;
176 struct tdb_context *tdb;
178 assert(layout->ftable != -1U);
179 assert(layout->htable != -1U);
181 len = sizeof(struct tdb_header);
183 /* First pass of layout: calc lengths */
184 for (i = 0; i < layout->num_elems; i++) {
185 union tdb_layout_elem *e = &layout->elem[i];
187 switch (e->base.type) {
189 len += free_record_len(e->free.len);
192 len += data_record_len(&e->used);
195 len += hashtable_len(&e->hashtable);
198 len += freetable_len(&e->freetable);
204 /* Now populate our header, cribbing from a real TDB header. */
205 tdb = tdb_open(NULL, TDB_INTERNAL, O_RDWR, 0, &tap_log_attr);
209 hdr->v.num_zones = layout->elem[layout->ftable].freetable.num_zones;
210 hdr->v.zone_bits = layout->elem[layout->ftable].freetable.zone_bits;
212 = layout->elem[layout->ftable].freetable.num_buckets;
213 hdr->v.free_off = layout->elem[layout->ftable].base.off
214 + sizeof(struct tdb_used_record);
215 hdr->v.hash_bits = layout->elem[layout->htable].hashtable.hash_bits;
216 hdr->v.hash_off = layout->elem[layout->htable].base.off
217 + sizeof(struct tdb_used_record);
219 /* Mug the tdb we have to make it use this. */
225 for (i = 0; i < layout->num_elems; i++) {
226 union tdb_layout_elem *e = &layout->elem[i];
227 switch (e->base.type) {
229 set_free_record(mem + e->base.off, e->free.len);
232 set_data_record(mem + e->base.off, tdb, &e->used);
235 set_hashtable(mem + e->base.off, tdb, &e->hashtable);
238 set_freetable(mem + e->base.off, tdb, &e->freetable);
243 /* Now fill the free and hash tables. */
244 for (i = 0; i < layout->num_elems; i++) {
245 union tdb_layout_elem *e = &layout->elem[i];
246 switch (e->base.type) {
248 add_to_freetable(tdb, e->base.off, e->free.len);
251 add_to_hashtable(tdb, e->base.off, e->used.key);