enum TDB_ERROR tdb_fetch(struct tdb_context *tdb, struct tdb_data key,
struct tdb_data *data)
{
tdb_off_t off;
struct tdb_used_record rec;
struct hash_info h;
enum TDB_ERROR ecode;
off = find_and_lock(tdb, key, F_RDLCK, &h, &rec, NULL);
if (TDB_OFF_IS_ERR(off)) {
return tdb->last_error = off;
}
if (!off) {
ecode = TDB_ERR_NOEXIST;
} else {
data->dsize = rec_data_length(&rec);
data->dptr = tdb_alloc_read(tdb, off + sizeof(rec) + key.dsize,
data->dsize);
if (TDB_PTR_IS_ERR(data->dptr)) {
ecode = TDB_PTR_ERR(data->dptr);
} else
ecode = TDB_SUCCESS;
}
tdb_unlock_hashes(tdb, h.hlock_start, h.hlock_range, F_RDLCK);
return tdb->last_error = ecode;
}
uint64_t hash_record(struct tdb_context *tdb, tdb_off_t off)
{
const struct tdb_used_record *r;
const void *key;
uint64_t klen, hash;
r = tdb_access_read(tdb, off, sizeof(*r), true);
if (TDB_PTR_IS_ERR(r)) {
/* FIXME */
return 0;
}
klen = rec_key_length(r);
tdb_access_release(tdb, r);
key = tdb_access_read(tdb, off + sizeof(*r), klen, false);
if (TDB_PTR_IS_ERR(key)) {
return 0;
}
hash = tdb_hash(tdb, key, klen);
tdb_access_release(tdb, key);
return hash;
}
enum TDB_ERROR tdb_parse_record_(struct tdb_context *tdb,
TDB_DATA key,
enum TDB_ERROR (*parse)(TDB_DATA k,
TDB_DATA d,
void *data),
void *data)
{
tdb_off_t off;
struct tdb_used_record rec;
struct hash_info h;
enum TDB_ERROR ecode;
if (tdb->flags & TDB_VERSION1) {
return tdb->last_error = tdb1_parse_record(tdb, key, parse,
data);
}
off = find_and_lock(tdb, key, F_RDLCK, &h, &rec, NULL);
if (TDB_OFF_IS_ERR(off)) {
return tdb->last_error = TDB_OFF_TO_ERR(off);
}
if (!off) {
ecode = TDB_ERR_NOEXIST;
} else {
const void *dptr;
dptr = tdb_access_read(tdb, off + sizeof(rec) + key.dsize,
rec_data_length(&rec), false);
if (TDB_PTR_IS_ERR(dptr)) {
ecode = TDB_PTR_ERR(dptr);
} else {
TDB_DATA d = tdb_mkdata(dptr, rec_data_length(&rec));
ecode = parse(key, d, data);
tdb_access_release(tdb, dptr);
}
}
tdb_unlock_hashes(tdb, h.hlock_start, h.hlock_range, F_RDLCK);
return tdb->last_error = ecode;
}
static tdb_bool_err key_matches(struct tdb_context *tdb,
const struct tdb_used_record *rec,
tdb_off_t off,
const struct tdb_data *key)
{
tdb_bool_err ret = false;
const char *rkey;
if (rec_key_length(rec) != key->dsize) {
tdb->stats.compare_wrong_keylen++;
return ret;
}
rkey = tdb_access_read(tdb, off + sizeof(*rec), key->dsize, false);
if (TDB_PTR_IS_ERR(rkey)) {
return TDB_PTR_ERR(rkey);
}
if (memcmp(rkey, key->dptr, key->dsize) == 0)
ret = true;
else
tdb->stats.compare_wrong_keycmp++;
tdb_access_release(tdb, rkey);
return ret;
}
