int md_init_disk(char *path)
{
md_nr_disks++;
if (xmkdir(path, def_dmode) < 0)
panic("%s, %m", path);
pstrcpy(md_disks[md_nr_disks - 1].path, PATH_MAX, path);
sd_iprintf("%s added to md, nr %d", md_disks[md_nr_disks - 1].path,
md_nr_disks);
return 0;
}
static void check_tmp_config(void)
{
int ret;
char tmp_config_path[PATH_MAX];
snprintf(tmp_config_path, PATH_MAX, "%s.tmp", config_path);
ret = unlink(tmp_config_path);
if (!ret || ret != ENOENT)
return;
sd_iprintf("removed temporal config file");
}
static void interpret_msg_pre_join(void)
{
int ret;
struct sph_msg snd, rcv;
struct sph_msg_join_reply *join_reply;
enum cluster_join_result res;
retry:
read_msg(&rcv);
if (rcv.type == SPH_SRV_MSG_JOIN_RETRY) {
sd_iprintf("join request is rejected, retrying");
do_shepherd_join();
goto retry;
} else if (rcv.type == SPH_SRV_MSG_NEW_NODE) {
struct sph_msg_join *join;
int join_len;
join_len = rcv.body_len;
join = xzalloc(join_len);
ret = xread(sph_comm_fd, join, join_len);
if (ret != join_len) {
sd_eprintf("xread() failed: %m");
exit(1);
}
res = sd_check_join_cb(&join->node, join->opaque);
if (res == CJ_RES_FAIL) {
sd_eprintf("sd_check_join_cb() failed");
exit(1);
}
assert(res == CJ_RES_SUCCESS);
/* FIXME: join->master_elected is needed? */
assert(join->master_elected);
is_master = true;
snd.type = SPH_CLI_MSG_NEW_NODE_REPLY;
snd.body_len = join_len;
ret = writev2(sph_comm_fd, &snd, join, join_len);
if (sizeof(snd) + join_len != ret) {
sd_eprintf("writev2() failed: %m");
exit(1);
}
free(join);
read_msg(&rcv);
}
if (rcv.type != SPH_SRV_MSG_JOIN_REPLY) {
sd_eprintf("unexpected message from shepherd, "
"received message: %s", sph_srv_msg_to_str(rcv.type));
/*
* In this case, the state of this sheep in shepherd must be
* SHEEP_STATE_CONNECTED. Messages other than SPH_MSG_JOIN_REPLY
* mean bugs of shepherd.
*/
exit(1);
}
join_reply = xzalloc(rcv.body_len);
ret = xread(sph_comm_fd, join_reply, rcv.body_len);
if (ret != rcv.body_len) {
sd_eprintf("xread() failed: %m");
exit(1);
}
sd_iprintf("join reply arrived, nr_nodes: %d", join_reply->nr_nodes);
if (join_reply->res == CJ_RES_MASTER_TRANSFER) {
is_master = true;
/* FIXME: This code is tricky, but Sheepdog assumes that */
/* nr_nodes = 1 when join_result = MASTER_TRANSFER... */
nr_nodes = 1;
nodes[0] = this_node;
} else {
memcpy(nodes, join_reply->nodes,
join_reply->nr_nodes * sizeof(struct sd_node));
nr_nodes = join_reply->nr_nodes;
}
sd_join_handler(&this_node, nodes, nr_nodes,
join_reply->res, join_reply->opaque);
free(join_reply);
sd_iprintf("shepherd_join() succeed");
state = STATE_JOINED;
}
static void interpret_msg_pre_join(void)
{
int ret;
struct sph_msg snd, rcv;
struct sph_msg_join_reply *join_reply;
retry:
read_msg(&rcv);
if (rcv.type == SPH_SRV_MSG_JOIN_RETRY) {
sd_iprintf("join request is rejected, retrying");
do_shepherd_join();
goto retry;
} else if (rcv.type == SPH_SRV_MSG_NEW_NODE) {
struct sph_msg_join *join;
int join_len;
join_len = rcv.body_len;
join = xzalloc(join_len);
ret = xread(sph_comm_fd, join, join_len);
if (ret != join_len) {
sd_eprintf("xread() failed: %m");
exit(1);
}
/*
* FIXME: member change events must be ordered with nonblocked
* events
*/
if (!sd_join_handler(&join->new_node, NULL, 0, join->opaque))
panic("sd_accept_handler() failed");
snd.type = SPH_CLI_MSG_ACCEPT;
snd.body_len = join_len;
ret = writev2(sph_comm_fd, &snd, join, join_len);
if (sizeof(snd) + join_len != ret) {
sd_eprintf("writev2() failed: %m");
exit(1);
}
free(join);
read_msg(&rcv);
}
if (rcv.type != SPH_SRV_MSG_JOIN_REPLY) {
sd_eprintf("unexpected message from shepherd, "
"received message: %s", sph_srv_msg_to_str(rcv.type));
/*
* In this case, the state of this sheep in shepherd must be
* SHEEP_STATE_CONNECTED. Messages other than SPH_MSG_JOIN_REPLY
* mean bugs of shepherd.
*/
exit(1);
}
join_reply = xzalloc(rcv.body_len);
ret = xread(sph_comm_fd, join_reply, rcv.body_len);
if (ret != rcv.body_len) {
sd_eprintf("xread() failed: %m");
exit(1);
}
sd_iprintf("join reply arrived, nr_nodes: %d", join_reply->nr_nodes);
memcpy(nodes, join_reply->nodes,
join_reply->nr_nodes * sizeof(struct sd_node));
nr_nodes = join_reply->nr_nodes;
/* FIXME: member change events must be ordered with nonblocked events */
sd_accept_handler(&this_node, nodes, nr_nodes, join_reply->opaque);
free(join_reply);
sd_iprintf("shepherd_join() succeed");
state = STATE_JOINED;
}
