static void join(struct sd_node *joining, struct join_message *msg)
{
if (msg->proto_ver != SD_SHEEP_PROTO_VER) {
eprintf("joining node sent a message with the wrong protocol version\n");
msg->result = SD_RES_VER_MISMATCH;
return;
}
msg->result = get_cluster_status(joining, msg->nodes, msg->nr_nodes,
msg->ctime, msg->epoch,
&msg->cluster_status, &msg->inc_epoch);
msg->nr_copies = sys->nr_copies;
msg->cluster_flags = sys->flags;
msg->ctime = get_cluster_ctime();
if (sd_store)
strcpy((char *)msg->store, sd_store->name);
}
static int cluster_sanity_check(struct sd_node *entries,
int nr_entries, uint64_t ctime, uint32_t epoch)
{
int ret = SD_RES_SUCCESS, nr_local_entries;
struct sd_node local_entries[SD_MAX_NODES];
uint32_t lepoch;
if (sys_stat_wait_format() || sys_stat_shutdown())
goto out;
/* When the joining node is newly created, we need not check anything. */
if (nr_entries == 0)
goto out;
if (ctime != get_cluster_ctime()) {
ret = SD_RES_INVALID_CTIME;
goto out;
}
lepoch = get_latest_epoch();
if (epoch > lepoch) {
ret = SD_RES_OLD_NODE_VER;
goto out;
}
if (sys_can_recover())
goto out;
if (epoch < lepoch) {
ret = SD_RES_NEW_NODE_VER;
goto out;
}
nr_local_entries = epoch_log_read_nr(epoch, (char *)local_entries,
sizeof(local_entries));
if (nr_entries != nr_local_entries ||
memcmp(entries, local_entries, sizeof(entries[0]) * nr_entries) != 0) {
ret = SD_RES_INVALID_EPOCH;
goto out;
}
out:
return ret;
}
static int cluster_sanity_check(struct join_message *jm)
{
uint64_t local_ctime = get_cluster_ctime();
uint32_t local_epoch = get_latest_epoch();
uint8_t local_nr_copies;
if (get_cluster_copies(&local_nr_copies)) {
eprintf("failed to get nr_copies\n");
return CJ_RES_FAIL;
}
if (jm->ctime != local_ctime) {
eprintf("joining node ctime doesn't match: %"
PRIu64 " vs %" PRIu64 "\n",
jm->ctime, local_ctime);
return CJ_RES_FAIL;
}
if (jm->epoch > local_epoch) {
eprintf("joining node epoch too large: %"
PRIu32 " vs %" PRIu32 "\n",
jm->epoch, local_epoch);
return CJ_RES_FAIL;
}
if (jm->nr_copies != local_nr_copies) {
eprintf("joining node nr_copies doesn't match: %u vs %u\n",
jm->nr_copies, local_nr_copies);
return CJ_RES_FAIL;
}
if (jm->cluster_flags != sys->flags) {
eprintf("joining node cluster_flags don't match: %u vs %u\n",
jm->cluster_flags, sys->flags);
return CJ_RES_FAIL;
}
return CJ_RES_SUCCESS;
}
