1 /* NTDB tools to create various canned database layouts. */
6 #include <ccan/err/err.h>
9 struct ntdb_layout *new_ntdb_layout(void)
11 struct ntdb_layout *layout = malloc(sizeof(*layout));
12 layout->num_elems = 0;
17 static void add(struct ntdb_layout *layout, union ntdb_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 ntdb_layout_add_freetable(struct ntdb_layout *layout)
27 union ntdb_layout_elem elem;
28 elem.base.type = FREETABLE;
32 void ntdb_layout_add_free(struct ntdb_layout *layout, ntdb_len_t len,
35 union ntdb_layout_elem elem;
36 elem.base.type = FREE;
38 elem.free.ftable_num = ftable;
42 void ntdb_layout_add_capability(struct ntdb_layout *layout,
49 union ntdb_layout_elem elem;
50 elem.base.type = CAPABILITY;
51 elem.capability.type = type;
53 elem.capability.type |= NTDB_CAP_NOWRITE;
55 elem.capability.type |= NTDB_CAP_NOOPEN;
57 elem.capability.type |= NTDB_CAP_NOCHECK;
58 elem.capability.extra = extra;
62 static NTDB_DATA dup_key(NTDB_DATA key)
65 ret.dsize = key.dsize;
66 ret.dptr = malloc(ret.dsize);
67 memcpy(ret.dptr, key.dptr, ret.dsize);
71 void ntdb_layout_add_used(struct ntdb_layout *layout,
72 NTDB_DATA key, NTDB_DATA data,
75 union ntdb_layout_elem elem;
76 elem.base.type = DATA;
77 elem.used.key = dup_key(key);
78 elem.used.data = dup_key(data);
79 elem.used.extra = extra;
83 static ntdb_len_t free_record_len(ntdb_len_t len)
85 return sizeof(struct ntdb_used_record) + len;
88 static ntdb_len_t data_record_len(struct tle_used *used)
91 len = sizeof(struct ntdb_used_record)
92 + used->key.dsize + used->data.dsize + used->extra;
93 assert(len >= sizeof(struct ntdb_free_record));
97 static ntdb_len_t capability_len(struct tle_capability *cap)
99 return sizeof(struct ntdb_capability) + cap->extra;
102 static ntdb_len_t freetable_len(struct tle_freetable *ftable)
104 return sizeof(struct ntdb_freetable);
107 static void set_free_record(void *mem, ntdb_len_t len)
109 /* We do all the work in add_to_freetable */
112 static void add_zero_pad(struct ntdb_used_record *u, size_t len, size_t extra)
115 ((char *)(u + 1))[len] = '\0';
118 static void set_data_record(void *mem, struct ntdb_context *ntdb,
119 struct tle_used *used)
121 struct ntdb_used_record *u = mem;
123 set_header(ntdb, u, NTDB_USED_MAGIC, used->key.dsize, used->data.dsize,
124 used->key.dsize + used->data.dsize + used->extra);
125 memcpy(u + 1, used->key.dptr, used->key.dsize);
126 memcpy((char *)(u + 1) + used->key.dsize,
127 used->data.dptr, used->data.dsize);
128 add_zero_pad(u, used->key.dsize + used->data.dsize, used->extra);
131 static void set_capability(void *mem, struct ntdb_context *ntdb,
132 struct tle_capability *cap, struct ntdb_header *hdr,
135 struct ntdb_capability *c = mem;
136 ntdb_len_t len = sizeof(*c) - sizeof(struct ntdb_used_record) + cap->extra;
140 set_header(ntdb, &c->hdr, NTDB_CAP_MAGIC, 0, len, len);
142 /* Append to capability list. */
144 hdr->capabilities = cap->base.off;
146 c = (struct ntdb_capability *)((char *)hdr + last_cap);
147 c->next = cap->base.off;
151 static void set_freetable(void *mem, struct ntdb_context *ntdb,
152 struct tle_freetable *freetable, struct ntdb_header *hdr,
153 ntdb_off_t last_ftable)
155 struct ntdb_freetable *ftable = mem;
156 memset(ftable, 0, sizeof(*ftable));
157 set_header(ntdb, &ftable->hdr, NTDB_FTABLE_MAGIC, 0,
158 sizeof(*ftable) - sizeof(ftable->hdr),
159 sizeof(*ftable) - sizeof(ftable->hdr));
162 ftable = (struct ntdb_freetable *)((char *)hdr + last_ftable);
163 ftable->next = freetable->base.off;
165 hdr->free_table = freetable->base.off;
169 static void add_to_freetable(struct ntdb_context *ntdb,
173 struct tle_freetable *freetable)
175 ntdb->ftable_off = freetable->base.off;
176 ntdb->ftable = ftable;
177 add_free_record(ntdb, eoff, sizeof(struct ntdb_used_record) + elen,
178 NTDB_LOCK_WAIT, false);
181 static ntdb_off_t hbucket_offset(ntdb_len_t idx)
183 return sizeof(struct ntdb_header) + sizeof(struct ntdb_used_record)
184 + idx * sizeof(ntdb_off_t);
187 /* FIXME: Our hash table handling here is primitive: we don't expand! */
188 static void add_to_hashtable(struct ntdb_context *ntdb,
193 uint32_t h = ntdb_hash(ntdb, key.dptr, key.dsize);
195 b_off = hbucket_offset(h & ((1 << ntdb->hash_bits)-1));
196 if (ntdb_read_off(ntdb, b_off) != 0)
199 ntdb_write_off(ntdb, b_off, encode_offset(ntdb, eoff, h));
202 static struct tle_freetable *find_ftable(struct ntdb_layout *layout, unsigned num)
206 for (i = 0; i < layout->num_elems; i++) {
207 if (layout->elem[i].base.type != FREETABLE)
210 return &layout->elem[i].ftable;
216 /* FIXME: Support NTDB_CONVERT */
217 struct ntdb_context *ntdb_layout_get(struct ntdb_layout *layout,
218 void (*freefn)(void *),
219 union ntdb_attribute *attr)
222 ntdb_off_t off, hdrlen, len, last_ftable, last_cap;
224 struct ntdb_context *ntdb;
226 /* Now populate our header, cribbing from a real NTDB header. */
227 ntdb = ntdb_open("layout", NTDB_INTERNAL, O_RDWR, 0, attr);
229 off = sizeof(struct ntdb_header) + sizeof(struct ntdb_used_record)
230 + (sizeof(ntdb_off_t) << ntdb->hash_bits);
233 /* First pass of layout: calc lengths */
234 for (i = 0; i < layout->num_elems; i++) {
235 union ntdb_layout_elem *e = &layout->elem[i];
237 switch (e->base.type) {
239 len = freetable_len(&e->ftable);
242 len = free_record_len(e->free.len);
245 len = data_record_len(&e->used);
248 len = capability_len(&e->capability);
257 /* Fill with some weird pattern. */
258 memset(mem, 0x99, off);
259 memcpy(mem, ntdb->file->map_ptr, hdrlen);
261 /* Mug the ntdb we have to make it use this. */
262 freefn(ntdb->file->map_ptr);
263 ntdb->file->map_ptr = mem;
264 ntdb->file->map_size = off;
268 for (i = 0; i < layout->num_elems; i++) {
269 union ntdb_layout_elem *e = &layout->elem[i];
270 switch (e->base.type) {
272 set_freetable(mem + e->base.off, ntdb, &e->ftable,
273 (struct ntdb_header *)mem, last_ftable);
274 last_ftable = e->base.off;
277 set_free_record(mem + e->base.off, e->free.len);
280 set_data_record(mem + e->base.off, ntdb, &e->used);
283 set_capability(mem + e->base.off, ntdb, &e->capability,
284 (struct ntdb_header *)mem, last_cap);
285 last_cap = e->base.off;
289 /* Must have a free table! */
292 /* Now fill the free and hash tables. */
293 for (i = 0; i < layout->num_elems; i++) {
294 union ntdb_layout_elem *e = &layout->elem[i];
295 switch (e->base.type) {
297 add_to_freetable(ntdb, e->base.off, e->free.len,
299 find_ftable(layout, e->free.ftable_num));
302 add_to_hashtable(ntdb, e->base.off, e->used.key);
309 ntdb->ftable_off = find_ftable(layout, 0)->base.off;
313 void ntdb_layout_write(struct ntdb_layout *layout, void (*freefn)(void *),
314 union ntdb_attribute *attr, const char *filename)
316 struct ntdb_context *ntdb = ntdb_layout_get(layout, freefn, attr);
319 fd = open(filename, O_WRONLY|O_TRUNC|O_CREAT, 0600);
321 err(1, "opening %s for writing", filename);
322 if (write(fd, ntdb->file->map_ptr, ntdb->file->map_size)
323 != ntdb->file->map_size)
324 err(1, "writing %s", filename);
329 void ntdb_layout_free(struct ntdb_layout *layout)
333 for (i = 0; i < layout->num_elems; i++) {
334 if (layout->elem[i].base.type == DATA) {
335 free(layout->elem[i].used.key.dptr);
336 free(layout->elem[i].used.data.dptr);