4 /* all lock info, to detect double-opens (fcntl file don't nest!) */
5 static struct tdb_file *files = NULL;
7 static struct tdb_file *find_file(dev_t device, ino_t ino)
11 for (i = files; i; i = i->next) {
12 if (i->device == device && i->inode == ino) {
20 static bool read_all(int fd, void *buf, size_t len)
24 ret = read(fd, buf, len);
32 buf = (char *)buf + ret;
38 static uint64_t random_number(struct tdb_context *tdb)
44 fd = open("/dev/urandom", O_RDONLY);
46 if (read_all(fd, &ret, sizeof(ret))) {
52 /* FIXME: Untested! Based on Wikipedia protocol description! */
53 fd = open("/dev/egd-pool", O_RDWR);
55 /* Command is 1, next byte is size we want to read. */
56 char cmd[2] = { 1, sizeof(uint64_t) };
57 if (write(fd, cmd, sizeof(cmd)) == sizeof(cmd)) {
58 char reply[1 + sizeof(uint64_t)];
59 int r = read(fd, reply, sizeof(reply));
61 /* Copy at least some bytes. */
62 memcpy(&ret, reply+1, r - 1);
63 if (reply[0] == sizeof(uint64_t)
64 && r == sizeof(reply)) {
73 /* Fallback: pid and time. */
74 gettimeofday(&now, NULL);
75 ret = getpid() * 100132289ULL + now.tv_sec * 1000000ULL + now.tv_usec;
76 tdb_logerr(tdb, TDB_SUCCESS, TDB_LOG_WARNING,
77 "tdb_open: random from getpid and time");
82 struct tdb_header hdr;
83 struct tdb_freetable ftable;
86 /* initialise a new database */
87 static enum TDB_ERROR tdb_new_database(struct tdb_context *tdb,
88 struct tdb_attribute_seed *seed,
89 struct tdb_header *hdr)
91 /* We make it up in memory, then write it out if not internal */
92 struct new_database newdb;
93 unsigned int magic_len;
97 /* Fill in the header */
98 newdb.hdr.version = TDB_VERSION;
100 newdb.hdr.hash_seed = seed->seed;
102 newdb.hdr.hash_seed = random_number(tdb);
103 newdb.hdr.hash_test = TDB_HASH_MAGIC;
104 newdb.hdr.hash_test = tdb->khash(&newdb.hdr.hash_test,
105 sizeof(newdb.hdr.hash_test),
108 newdb.hdr.recovery = 0;
109 newdb.hdr.features_used = newdb.hdr.features_offered = TDB_FEATURE_MASK;
110 newdb.hdr.seqnum = 0;
111 memset(newdb.hdr.reserved, 0, sizeof(newdb.hdr.reserved));
112 /* Initial hashes are empty. */
113 memset(newdb.hdr.hashtable, 0, sizeof(newdb.hdr.hashtable));
116 newdb.hdr.free_table = offsetof(struct new_database, ftable);
117 memset(&newdb.ftable, 0, sizeof(newdb.ftable));
118 ecode = set_header(NULL, &newdb.ftable.hdr, TDB_FTABLE_MAGIC, 0,
119 sizeof(newdb.ftable) - sizeof(newdb.ftable.hdr),
120 sizeof(newdb.ftable) - sizeof(newdb.ftable.hdr),
122 if (ecode != TDB_SUCCESS) {
127 memset(newdb.hdr.magic_food, 0, sizeof(newdb.hdr.magic_food));
128 strcpy(newdb.hdr.magic_food, TDB_MAGIC_FOOD);
130 /* This creates an endian-converted database, as if read from disk */
131 magic_len = sizeof(newdb.hdr.magic_food);
133 (char *)&newdb.hdr + magic_len, sizeof(newdb) - magic_len);
137 if (tdb->flags & TDB_INTERNAL) {
138 tdb->file->map_size = sizeof(newdb);
139 tdb->file->map_ptr = malloc(tdb->file->map_size);
140 if (!tdb->file->map_ptr) {
141 return tdb_logerr(tdb, TDB_ERR_OOM, TDB_LOG_ERROR,
143 " failed to allocate");
145 memcpy(tdb->file->map_ptr, &newdb, tdb->file->map_size);
148 if (lseek(tdb->file->fd, 0, SEEK_SET) == -1) {
149 return tdb_logerr(tdb, TDB_ERR_IO, TDB_LOG_ERROR,
151 " failed to seek: %s", strerror(errno));
154 if (ftruncate(tdb->file->fd, 0) == -1) {
155 return tdb_logerr(tdb, TDB_ERR_IO, TDB_LOG_ERROR,
157 " failed to truncate: %s", strerror(errno));
160 rlen = write(tdb->file->fd, &newdb, sizeof(newdb));
161 if (rlen != sizeof(newdb)) {
164 return tdb_logerr(tdb, TDB_ERR_IO, TDB_LOG_ERROR,
165 "tdb_new_database: %zi writing header: %s",
166 rlen, strerror(errno));
171 static enum TDB_ERROR tdb_new_file(struct tdb_context *tdb)
173 tdb->file = malloc(sizeof(*tdb->file));
175 return tdb_logerr(tdb, TDB_ERR_OOM, TDB_LOG_ERROR,
176 "tdb_open: could alloc tdb_file structure");
177 tdb->file->num_lockrecs = 0;
178 tdb->file->lockrecs = NULL;
179 tdb->file->allrecord_lock.count = 0;
180 tdb->file->refcnt = 1;
184 struct tdb_context *tdb_open(const char *name, int tdb_flags,
185 int open_flags, mode_t mode,
186 union tdb_attribute *attr)
188 struct tdb_context *tdb;
194 struct tdb_header hdr;
195 struct tdb_attribute_seed *seed = NULL;
197 enum TDB_ERROR ecode;
199 tdb = malloc(sizeof(*tdb));
206 tdb->direct_access = 0;
207 tdb->flags = tdb_flags;
209 tdb->transaction = NULL;
217 switch (attr->base.attr) {
218 case TDB_ATTRIBUTE_LOG:
219 tdb->logfn = attr->log.log_fn;
220 tdb->log_private = attr->log.log_private;
222 case TDB_ATTRIBUTE_HASH:
223 tdb->khash = attr->hash.hash_fn;
224 tdb->hash_priv = attr->hash.hash_private;
226 case TDB_ATTRIBUTE_SEED:
229 case TDB_ATTRIBUTE_STATS:
230 tdb->stats = &attr->stats;
231 /* They have stats we don't know about? Tell them. */
232 if (tdb->stats->size > sizeof(attr->stats))
233 tdb->stats->size = sizeof(attr->stats);
236 ecode = tdb_logerr(tdb, TDB_ERR_EINVAL,
239 " unknown attribute type %u",
243 attr = attr->base.next;
246 if (tdb_flags & ~(TDB_INTERNAL | TDB_NOLOCK | TDB_NOMMAP | TDB_CONVERT
247 | TDB_NOSYNC | TDB_SEQNUM)) {
248 ecode = tdb_logerr(tdb, TDB_ERR_EINVAL, TDB_LOG_USE_ERROR,
249 "tdb_open: unknown flags %u", tdb_flags);
253 if ((open_flags & O_ACCMODE) == O_WRONLY) {
254 ecode = tdb_logerr(tdb, TDB_ERR_EINVAL, TDB_LOG_USE_ERROR,
255 "tdb_open: can't open tdb %s write-only",
260 if ((open_flags & O_ACCMODE) == O_RDONLY) {
261 tdb->read_only = true;
262 tdb->mmap_flags = PROT_READ;
264 tdb->read_only = false;
265 tdb->mmap_flags = PROT_READ | PROT_WRITE;
268 /* internal databases don't need any of the rest. */
269 if (tdb->flags & TDB_INTERNAL) {
270 tdb->flags |= (TDB_NOLOCK | TDB_NOMMAP);
271 ecode = tdb_new_file(tdb);
272 if (ecode != TDB_SUCCESS) {
276 ecode = tdb_new_database(tdb, seed, &hdr);
277 if (ecode != TDB_SUCCESS) {
281 tdb->name = strdup(name);
283 ecode = tdb_logerr(tdb, TDB_ERR_OOM,
285 "tdb_open: failed to"
290 tdb_convert(tdb, &hdr.hash_seed, sizeof(hdr.hash_seed));
291 tdb->hash_seed = hdr.hash_seed;
292 tdb_ftable_init(tdb);
296 if (stat(name, &st) != -1)
297 tdb->file = find_file(st.st_dev, st.st_ino);
302 if ((fd = open(name, open_flags, mode)) == -1) {
303 /* errno set by open(2) */
305 tdb_logerr(tdb, TDB_ERR_IO, TDB_LOG_ERROR,
306 "tdb_open: could not open file %s: %s",
307 name, strerror(errno));
311 /* on exec, don't inherit the fd */
312 v = fcntl(fd, F_GETFD, 0);
313 fcntl(fd, F_SETFD, v | FD_CLOEXEC);
315 if (fstat(fd, &st) == -1) {
317 tdb_logerr(tdb, TDB_ERR_IO, TDB_LOG_ERROR,
318 "tdb_open: could not stat open %s: %s",
319 name, strerror(errno));
323 ecode = tdb_new_file(tdb);
324 if (ecode != TDB_SUCCESS)
327 tdb->file->next = files;
329 tdb->file->device = st.st_dev;
330 tdb->file->inode = st.st_ino;
331 tdb->file->map_ptr = NULL;
332 tdb->file->map_size = sizeof(struct tdb_header);
335 /* ensure there is only one process initialising at once */
336 ecode = tdb_lock_open(tdb, TDB_LOCK_WAIT|TDB_LOCK_NOCHECK);
337 if (ecode != TDB_SUCCESS) {
341 /* If they used O_TRUNC, read will return 0. */
342 rlen = pread(tdb->file->fd, &hdr, sizeof(hdr), 0);
343 if (rlen == 0 && (open_flags & O_CREAT)) {
344 ecode = tdb_new_database(tdb, seed, &hdr);
345 if (ecode != TDB_SUCCESS) {
348 } else if (rlen < 0) {
349 ecode = tdb_logerr(tdb, TDB_ERR_IO, TDB_LOG_ERROR,
350 "tdb_open: error %s reading %s",
351 strerror(errno), name);
353 } else if (rlen < sizeof(hdr)
354 || strcmp(hdr.magic_food, TDB_MAGIC_FOOD) != 0) {
355 ecode = tdb_logerr(tdb, TDB_ERR_IO, TDB_LOG_ERROR,
356 "tdb_open: %s is not a tdb file", name);
360 if (hdr.version != TDB_VERSION) {
361 if (hdr.version == bswap_64(TDB_VERSION))
362 tdb->flags |= TDB_CONVERT;
365 ecode = tdb_logerr(tdb, TDB_ERR_IO, TDB_LOG_ERROR,
367 " %s is unknown version 0x%llx",
368 name, (long long)hdr.version);
373 tdb_convert(tdb, &hdr, sizeof(hdr));
374 tdb->hash_seed = hdr.hash_seed;
375 hash_test = TDB_HASH_MAGIC;
376 hash_test = tdb_hash(tdb, &hash_test, sizeof(hash_test));
377 if (hdr.hash_test != hash_test) {
378 /* wrong hash variant */
379 ecode = tdb_logerr(tdb, TDB_ERR_IO, TDB_LOG_ERROR,
381 " %s uses a different hash function",
386 tdb->name = strdup(name);
388 ecode = tdb_logerr(tdb, TDB_ERR_OOM, TDB_LOG_ERROR,
389 "tdb_open: failed to allocate name");
393 /* Clear any features we don't understand. */
394 if ((open_flags & O_ACCMODE) != O_RDONLY) {
395 hdr.features_used &= TDB_FEATURE_MASK;
396 if (tdb_write_convert(tdb, offsetof(struct tdb_header,
399 sizeof(hdr.features_used)) == -1)
403 tdb_unlock_open(tdb);
405 /* This make sure we have current map_size and mmap. */
406 tdb->methods->oob(tdb, tdb->file->map_size + 1, true);
408 /* Now it's fully formed, recover if necessary. */
409 berr = tdb_needs_recovery(tdb);
410 if (unlikely(berr != false)) {
415 ecode = tdb_lock_and_recover(tdb);
416 if (ecode != TDB_SUCCESS) {
421 ecode = tdb_ftable_init(tdb);
422 if (ecode != TDB_SUCCESS) {
426 /* Add to linked list if we're new. */
427 if (tdb->file->refcnt == 1)
432 /* Map ecode to some logical errno. */
434 case TDB_ERR_CORRUPT:
439 saved_errno = EWOULDBLOCK;
442 saved_errno = ENOMEM;
445 saved_errno = EINVAL;
448 saved_errno = EINVAL;
456 free((char *)tdb->name);
459 if (--tdb->file->refcnt == 0) {
460 assert(tdb->file->num_lockrecs == 0);
461 if (tdb->file->map_ptr) {
462 if (tdb->flags & TDB_INTERNAL) {
463 free(tdb->file->map_ptr);
465 tdb_munmap(tdb->file);
467 if (close(tdb->file->fd) != 0)
468 tdb_logerr(tdb, TDB_ERR_IO, TDB_LOG_ERROR,
469 "tdb_open: failed to close tdb fd"
470 " on error: %s", strerror(errno));
471 free(tdb->file->lockrecs);
481 int tdb_close(struct tdb_context *tdb)
485 tdb_trace(tdb, "tdb_close");
487 if (tdb->transaction) {
488 tdb_transaction_cancel(tdb);
491 if (tdb->file->map_ptr) {
492 if (tdb->flags & TDB_INTERNAL)
493 free(tdb->file->map_ptr);
495 tdb_munmap(tdb->file);
497 free((char *)tdb->name);
502 if (--tdb->file->refcnt == 0) {
503 ret = close(tdb->file->fd);
505 /* Remove from files list */
506 for (i = &files; *i; i = &(*i)->next) {
507 if (*i == tdb->file) {
508 *i = tdb->file->next;
512 free(tdb->file->lockrecs);