1 /* TDB tools to create various canned database layouts. */
9 struct tdb_layout *new_tdb_layout(const char *filename)
11 struct tdb_layout *layout = malloc(sizeof(*layout));
12 layout->filename = filename;
13 layout->num_elems = 0;
18 static void add(struct tdb_layout *layout, union tdb_layout_elem elem)
20 layout->elem = realloc(layout->elem,
21 sizeof(layout->elem[0])
22 * (layout->num_elems+1));
23 layout->elem[layout->num_elems++] = elem;
26 void tdb_layout_add_freetable(struct tdb_layout *layout)
28 union tdb_layout_elem elem;
29 elem.base.type = FREETABLE;
33 void tdb_layout_add_free(struct tdb_layout *layout, tdb_len_t len,
36 union tdb_layout_elem elem;
37 elem.base.type = FREE;
39 elem.free.ftable_num = ftable;
43 static struct tdb_data dup_key(struct tdb_data key)
46 ret.dsize = key.dsize;
47 ret.dptr = malloc(ret.dsize);
48 memcpy(ret.dptr, key.dptr, ret.dsize);
52 void tdb_layout_add_used(struct tdb_layout *layout,
53 TDB_DATA key, TDB_DATA data,
56 union tdb_layout_elem elem;
57 elem.base.type = DATA;
58 elem.used.key = dup_key(key);
59 elem.used.data = dup_key(data);
60 elem.used.extra = extra;
64 static tdb_len_t free_record_len(tdb_len_t len)
66 return sizeof(struct tdb_used_record) + len;
69 static tdb_len_t data_record_len(struct tle_used *used)
72 len = sizeof(struct tdb_used_record)
73 + used->key.dsize + used->data.dsize + used->extra;
74 assert(len >= sizeof(struct tdb_free_record));
78 static tdb_len_t hashtable_len(struct tle_hashtable *htable)
80 return sizeof(struct tdb_used_record)
81 + (sizeof(tdb_off_t) << TDB_SUBLEVEL_HASH_BITS)
85 static tdb_len_t freetable_len(struct tle_freetable *ftable)
87 return sizeof(struct tdb_freetable);
90 static void set_free_record(void *mem, tdb_len_t len)
92 /* We do all the work in add_to_freetable */
95 static void add_zero_pad(struct tdb_used_record *u, size_t len, size_t extra)
98 ((char *)(u + 1))[len] = '\0';
101 static void set_data_record(void *mem, struct tdb_context *tdb,
102 struct tle_used *used)
104 struct tdb_used_record *u = mem;
106 set_header(tdb, u, TDB_USED_MAGIC, used->key.dsize, used->data.dsize,
107 used->key.dsize + used->data.dsize + used->extra,
108 tdb_hash(tdb, used->key.dptr, used->key.dsize));
109 memcpy(u + 1, used->key.dptr, used->key.dsize);
110 memcpy((char *)(u + 1) + used->key.dsize,
111 used->data.dptr, used->data.dsize);
112 add_zero_pad(u, used->key.dsize + used->data.dsize, used->extra);
115 static void set_hashtable(void *mem, struct tdb_context *tdb,
116 struct tle_hashtable *htable)
118 struct tdb_used_record *u = mem;
119 tdb_len_t len = sizeof(tdb_off_t) << TDB_SUBLEVEL_HASH_BITS;
121 set_header(tdb, u, TDB_HTABLE_MAGIC, 0, len, len + htable->extra, 0);
122 memset(u + 1, 0, len);
123 add_zero_pad(u, len, htable->extra);
126 static void set_freetable(void *mem, struct tdb_context *tdb,
127 struct tle_freetable *freetable, struct tdb_header *hdr,
128 tdb_off_t last_ftable)
130 struct tdb_freetable *ftable = mem;
131 memset(ftable, 0, sizeof(*ftable));
132 set_header(tdb, &ftable->hdr, TDB_FTABLE_MAGIC, 0,
133 sizeof(*ftable) - sizeof(ftable->hdr),
134 sizeof(*ftable) - sizeof(ftable->hdr), 0);
137 ftable = (struct tdb_freetable *)((char *)hdr + last_ftable);
138 ftable->next = freetable->base.off;
140 hdr->free_table = freetable->base.off;
144 static void add_to_freetable(struct tdb_context *tdb,
148 struct tle_freetable *freetable)
150 tdb->ftable_off = freetable->base.off;
151 tdb->ftable = ftable;
152 add_free_record(tdb, eoff, sizeof(struct tdb_used_record) + elen,
153 TDB_LOCK_WAIT, false);
156 static tdb_off_t hbucket_off(tdb_off_t group_start, unsigned ingroup)
159 + (ingroup % (1 << TDB_HASH_GROUP_BITS)) * sizeof(tdb_off_t);
162 /* Get bits from a value. */
163 static uint32_t bits(uint64_t val, unsigned start, unsigned num)
166 return (val >> start) & ((1U << num) - 1);
169 /* We take bits from the top: that way we can lock whole sections of the hash
170 * by using lock ranges. */
171 static uint32_t use_bits(uint64_t h, unsigned num, unsigned *used)
174 return bits(h, 64 - *used, num);
177 static tdb_off_t encode_offset(tdb_off_t new_off, unsigned bucket,
182 | ((uint64_t)bits(h, 64 - TDB_OFF_UPPER_STEAL_EXTRA,
183 TDB_OFF_UPPER_STEAL_EXTRA)
184 << TDB_OFF_HASH_EXTRA_BIT);
187 /* FIXME: Our hash table handling here is primitive: we don't expand! */
188 static void add_to_hashtable(struct tdb_context *tdb,
192 uint64_t h = tdb_hash(tdb, key.dptr, key.dsize);
193 tdb_off_t b_off, group_start;
194 unsigned i, group, in_group;
197 group = use_bits(h, TDB_TOPLEVEL_HASH_BITS-TDB_HASH_GROUP_BITS, &used);
198 in_group = use_bits(h, TDB_HASH_GROUP_BITS, &used);
200 group_start = offsetof(struct tdb_header, hashtable)
201 + group * (sizeof(tdb_off_t) << TDB_HASH_GROUP_BITS);
203 for (i = 0; i < (1 << TDB_HASH_GROUP_BITS); i++) {
204 unsigned bucket = (in_group + i) % (1 << TDB_HASH_GROUP_BITS);
206 b_off = hbucket_off(group_start, bucket);
207 if (tdb_read_off(tdb, b_off) == 0) {
208 tdb_write_off(tdb, b_off,
209 encode_offset(eoff, in_group, h));
216 static struct tle_freetable *find_ftable(struct tdb_layout *layout, unsigned num)
220 for (i = 0; i < layout->num_elems; i++) {
221 if (layout->elem[i].base.type != FREETABLE)
224 return &layout->elem[i].ftable;
230 /* FIXME: Support TDB_CONVERT */
231 struct tdb_context *tdb_layout_get(struct tdb_layout *layout,
232 union tdb_attribute *attr)
235 tdb_off_t off, len, last_ftable;
237 struct tdb_context *tdb;
239 off = sizeof(struct tdb_header);
241 /* First pass of layout: calc lengths */
242 for (i = 0; i < layout->num_elems; i++) {
243 union tdb_layout_elem *e = &layout->elem[i];
245 switch (e->base.type) {
247 len = freetable_len(&e->ftable);
250 len = free_record_len(e->free.len);
253 len = data_record_len(&e->used);
256 len = hashtable_len(&e->hashtable);
265 /* Fill with some weird pattern. */
266 memset(mem, 0x99, off);
267 /* Now populate our header, cribbing from a real TDB header. */
268 tdb = tdb_open(NULL, TDB_INTERNAL, O_RDWR, 0, attr);
269 memcpy(mem, tdb->file->map_ptr, sizeof(struct tdb_header));
271 /* Mug the tdb we have to make it use this. */
272 free(tdb->file->map_ptr);
273 tdb->file->map_ptr = mem;
274 tdb->file->map_size = off;
277 for (i = 0; i < layout->num_elems; i++) {
278 union tdb_layout_elem *e = &layout->elem[i];
279 switch (e->base.type) {
281 set_freetable(mem + e->base.off, tdb, &e->ftable,
282 (struct tdb_header *)mem, last_ftable);
283 last_ftable = e->base.off;
286 set_free_record(mem + e->base.off, e->free.len);
289 set_data_record(mem + e->base.off, tdb, &e->used);
292 set_hashtable(mem + e->base.off, tdb, &e->hashtable);
296 /* Must have a free table! */
299 /* Now fill the free and hash tables. */
300 for (i = 0; i < layout->num_elems; i++) {
301 union tdb_layout_elem *e = &layout->elem[i];
302 switch (e->base.type) {
304 add_to_freetable(tdb, e->base.off, e->free.len,
306 find_ftable(layout, e->free.ftable_num));
309 add_to_hashtable(tdb, e->base.off, e->used.key);
316 tdb->ftable_off = find_ftable(layout, 0)->base.off;
318 /* Get physical if they asked for it. */
319 if (layout->filename) {
320 int fd = open(layout->filename, O_WRONLY|O_TRUNC|O_CREAT,
323 err(1, "opening %s for writing", layout->filename);
324 if (write(fd, tdb->file->map_ptr, tdb->file->map_size)
325 != tdb->file->map_size)
326 err(1, "writing %s", layout->filename);
329 /* NOMMAP is for lockcheck. */
330 tdb = tdb_open(layout->filename, TDB_NOMMAP, O_RDWR, 0,
337 void tdb_layout_free(struct tdb_layout *layout)
341 for (i = 0; i < layout->num_elems; i++) {
342 if (layout->elem[i].base.type == DATA) {
343 free(layout->elem[i].used.key.dptr);
344 free(layout->elem[i].used.data.dptr);