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corosync.c
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corosync.c
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/*
* Copyright (C) 2011 Nippon Telegraph and Telephone Corporation.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version
* 2 as published by the Free Software Foundation.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdio.h>
#include <unistd.h>
#include <sys/epoll.h>
#include <corosync/cpg.h>
#include <corosync/cfg.h>
#include "cluster.h"
#include "event.h"
#include "work.h"
struct cpg_node {
uint32_t nodeid;
uint32_t pid;
uint32_t gone;
struct sd_node ent;
};
static cpg_handle_t cpg_handle;
static struct cpg_name cpg_group = { 8, "sheepdog" };
static corosync_cfg_handle_t cfg_handle;
static struct cpg_node this_node;
static LIST_HEAD(corosync_notify_list);
static LIST_HEAD(corosync_confchg_list);
static struct cpg_node cpg_nodes[SD_MAX_NODES];
static size_t nr_cpg_nodes;
static int self_elect;
static int join_finished;
/* event types which are dispatched in corosync_dispatch() */
enum corosync_event_type {
COROSYNC_EVENT_TYPE_JOIN_REQUEST,
COROSYNC_EVENT_TYPE_JOIN_RESPONSE,
COROSYNC_EVENT_TYPE_LEAVE,
COROSYNC_EVENT_TYPE_BLOCK,
COROSYNC_EVENT_TYPE_NOTIFY,
};
/* multicast message type */
enum corosync_message_type {
COROSYNC_MSG_TYPE_JOIN_REQUEST,
COROSYNC_MSG_TYPE_JOIN_RESPONSE,
COROSYNC_MSG_TYPE_LEAVE,
COROSYNC_MSG_TYPE_NOTIFY,
COROSYNC_MSG_TYPE_BLOCK,
COROSYNC_MSG_TYPE_UNBLOCK,
};
struct corosync_event {
enum corosync_event_type type;
struct cpg_node sender;
void *msg;
size_t msg_len;
enum cluster_join_result result;
uint32_t nr_nodes;
struct cpg_node nodes[SD_MAX_NODES];
int callbacked;
struct list_head list;
};
struct corosync_message {
struct cpg_node sender;
enum corosync_message_type type : 4;
enum cluster_join_result result : 4;
uint32_t msg_len;
uint32_t nr_nodes;
struct cpg_node nodes[SD_MAX_NODES];
uint8_t msg[0];
};
static int cpg_node_equal(struct cpg_node *a, struct cpg_node *b)
{
return (a->nodeid == b->nodeid && a->pid == b->pid);
}
static inline int find_cpg_node(struct cpg_node *nodes, size_t nr_nodes,
struct cpg_node *key)
{
int i;
for (i = 0; i < nr_nodes; i++)
if (cpg_node_equal(nodes + i, key))
return i;
return -1;
}
static inline void add_cpg_node(struct cpg_node *nodes, size_t nr_nodes,
struct cpg_node *added)
{
nodes[nr_nodes++] = *added;
}
static inline void del_cpg_node(struct cpg_node *nodes, size_t nr_nodes,
struct cpg_node *deled)
{
int idx;
idx = find_cpg_node(nodes, nr_nodes, deled);
if (idx < 0) {
dprintf("cannot find node\n");
return;
}
nr_nodes--;
memmove(nodes + idx, nodes + idx + 1, sizeof(*nodes) * (nr_nodes - idx));
}
static int corosync_get_local_addr(uint8_t *addr)
{
int ret, nr;
corosync_cfg_node_address_t caddr;
struct sockaddr_storage *ss = (struct sockaddr_storage *)caddr.address;
struct sockaddr_in *sin = (struct sockaddr_in *)caddr.address;
struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)caddr.address;
void *saddr;
ret = corosync_cfg_get_node_addrs(cfg_handle, this_node.nodeid, 1,
&nr, &caddr);
if (ret != CS_OK) {
vprintf(SDOG_ERR, "failed to get node addresses (%d)\n", ret);
return -1;
}
if (!nr) {
vprintf(SDOG_ERR, "no node addresses found\n");
return -1;
}
if (ss->ss_family == AF_INET6) {
saddr = &sin6->sin6_addr;
memcpy(addr, saddr, 16);
} else if (ss->ss_family == AF_INET) {
saddr = &sin->sin_addr;
memset(addr, 0, 16);
memcpy(addr + 12, saddr, 4);
} else {
vprintf(SDOG_ERR, "unknown protocol %d\n", ss->ss_family);
return -1;
}
return 0;
}
static int send_message(enum corosync_message_type type,
enum cluster_join_result result,
struct cpg_node *sender, struct cpg_node *nodes,
size_t nr_nodes, void *msg, size_t msg_len)
{
struct iovec iov[2];
int ret, iov_cnt = 1;
struct corosync_message cmsg = {
.type = type,
.msg_len = msg_len,
.result = result,
.sender = *sender,
.nr_nodes = nr_nodes,
};
if (nodes)
memcpy(cmsg.nodes, nodes, sizeof(*nodes) * nr_nodes);
iov[0].iov_base = &cmsg;
iov[0].iov_len = sizeof(cmsg);
if (msg) {
iov[1].iov_base = msg;
iov[1].iov_len = msg_len;
iov_cnt++;
}
retry:
ret = cpg_mcast_joined(cpg_handle, CPG_TYPE_AGREED, iov, iov_cnt);
switch (ret) {
case CPG_OK:
break;
case CPG_ERR_TRY_AGAIN:
dprintf("failed to send message: retrying\n");
sleep(1);
goto retry;
default:
eprintf("failed to send message (%d)\n", ret);
return -1;
}
return 0;
}
static inline struct corosync_event *
find_notify_event(enum corosync_event_type type, struct cpg_node *sender)
{
struct corosync_event *cevent;
list_for_each_entry(cevent, &corosync_notify_list, list) {
if (cevent->type == type &&
cpg_node_equal(&cevent->sender, sender))
return cevent;
}
return NULL;
}
static inline struct corosync_event *
find_confchg_event(enum corosync_event_type type, struct cpg_node *sender)
{
struct corosync_event *cevent;
list_for_each_entry(cevent, &corosync_confchg_list, list) {
if (cevent->type == type &&
cpg_node_equal(&cevent->sender, sender))
return cevent;
}
return NULL;
}
static inline bool event_is_confchg(enum corosync_event_type type)
{
if (type == COROSYNC_EVENT_TYPE_BLOCK ||
type == COROSYNC_EVENT_TYPE_NOTIFY)
return false;
return true;
}
static inline struct corosync_event *
find_event(enum corosync_event_type type, struct cpg_node *sender)
{
if (event_is_confchg(type))
return find_confchg_event(type, sender);
else
return find_notify_event(type, sender);
}
static int is_master(struct cpg_node *node)
{
int i;
struct cpg_node *n = node;
if (!n)
n = &this_node;
if (nr_cpg_nodes == 0)
/* this node should be the first cpg node */
return 0;
for (i = 0; i < SD_MAX_NODES; i++) {
if (!cpg_nodes[i].gone)
break;
}
if (cpg_node_equal(&cpg_nodes[i], n))
return i;
return -1;
}
static void build_node_list(struct cpg_node *nodes, size_t nr_nodes,
struct sd_node *entries)
{
int i;
for (i = 0; i < nr_nodes; i++)
entries[i] = nodes[i].ent;
}
/*
* Process one dispatch event
*
* Returns 1 if the event is processed
*/
static int __corosync_dispatch_one(struct corosync_event *cevent)
{
enum cluster_join_result res;
struct sd_node entries[SD_MAX_NODES];
int idx;
static bool blocked = false;
switch (cevent->type) {
case COROSYNC_EVENT_TYPE_JOIN_REQUEST:
if (is_master(&this_node) < 0)
return 0;
if (!cevent->msg)
/* we haven't receive JOIN_REQUEST yet */
return 0;
if (cevent->callbacked)
/* check_join() must be called only once */
return 0;
res = sd_check_join_cb(&cevent->sender.ent,
cevent->msg);
if (res == CJ_RES_MASTER_TRANSFER)
nr_cpg_nodes = 0;
send_message(COROSYNC_MSG_TYPE_JOIN_RESPONSE, res,
&cevent->sender, cpg_nodes, nr_cpg_nodes,
cevent->msg, cevent->msg_len);
if (res == CJ_RES_MASTER_TRANSFER) {
eprintf("failed to join sheepdog cluster: please retry when master is up\n");
exit(1);
}
cevent->callbacked = 1;
return 0;
case COROSYNC_EVENT_TYPE_JOIN_RESPONSE:
switch (cevent->result) {
case CJ_RES_SUCCESS:
case CJ_RES_MASTER_TRANSFER:
case CJ_RES_JOIN_LATER:
add_cpg_node(cpg_nodes, nr_cpg_nodes, &cevent->sender);
nr_cpg_nodes++;
/* fall through */
case CJ_RES_FAIL:
build_node_list(cpg_nodes, nr_cpg_nodes, entries);
sd_join_handler(&cevent->sender.ent, entries,
nr_cpg_nodes, cevent->result,
cevent->msg);
break;
}
break;
case COROSYNC_EVENT_TYPE_LEAVE:
idx = find_cpg_node(cpg_nodes, nr_cpg_nodes, &cevent->sender);
if (idx < 0)
break;
cevent->sender.ent = cpg_nodes[idx].ent;
del_cpg_node(cpg_nodes, nr_cpg_nodes, &cevent->sender);
nr_cpg_nodes--;
build_node_list(cpg_nodes, nr_cpg_nodes, entries);
sd_leave_handler(&cevent->sender.ent, entries, nr_cpg_nodes);
break;
case COROSYNC_EVENT_TYPE_BLOCK:
if (blocked)
/* block events until the unblock message changes this
event type to COROSYNC_EVENT_TYPE_NOTIFY */
return 0;
blocked = sd_block_handler(&cevent->sender.ent);
/* block other messages until the unblock message comes */
return 0;
case COROSYNC_EVENT_TYPE_NOTIFY:
blocked = false;
sd_notify_handler(&cevent->sender.ent, cevent->msg,
cevent->msg_len);
break;
}
return 1;
}
static void __corosync_dispatch(void)
{
struct corosync_event *cevent;
while (!list_empty(&corosync_notify_list) ||
!list_empty(&corosync_confchg_list)) {
if (!list_empty(&corosync_confchg_list))
cevent = list_first_entry(&corosync_confchg_list,
typeof(*cevent), list);
else
cevent = list_first_entry(&corosync_notify_list,
typeof(*cevent), list);
/* update join status */
if (!join_finished) {
switch (cevent->type) {
case COROSYNC_EVENT_TYPE_JOIN_REQUEST:
if (self_elect) {
join_finished = 1;
nr_cpg_nodes = 0;
}
break;
case COROSYNC_EVENT_TYPE_JOIN_RESPONSE:
if (cpg_node_equal(&cevent->sender,
&this_node)) {
join_finished = 1;
nr_cpg_nodes = cevent->nr_nodes;
memcpy(cpg_nodes, cevent->nodes,
sizeof(*cevent->nodes) *
cevent->nr_nodes);
}
break;
default:
break;
}
}
if (join_finished) {
if (!__corosync_dispatch_one(cevent))
return;
} else {
switch (cevent->type) {
case COROSYNC_MSG_TYPE_JOIN_REQUEST:
case COROSYNC_MSG_TYPE_BLOCK:
return;
default:
break;
}
}
list_del(&cevent->list);
free(cevent->msg);
free(cevent);
}
}
static struct corosync_event *
update_event(enum corosync_event_type type, struct cpg_node *sender, void *msg,
size_t msg_len)
{
struct corosync_event *cevent;
cevent = find_event(type, sender);
if (!cevent)
/* block message was casted before this node joins */
return NULL;
cevent->msg_len = msg_len;
if (msg_len) {
cevent->msg = realloc(cevent->msg, msg_len);
if (!cevent->msg)
panic("failed to allocate memory\n");
memcpy(cevent->msg, msg, msg_len);
} else {
free(cevent->msg);
cevent->msg = NULL;
}
return cevent;
}
static void cdrv_cpg_deliver(cpg_handle_t handle,
const struct cpg_name *group_name,
uint32_t nodeid, uint32_t pid,
void *msg, size_t msg_len)
{
struct corosync_event *cevent;
struct corosync_message *cmsg = msg;
int master;
dprintf("%d\n", cmsg->type);
switch (cmsg->type) {
case COROSYNC_MSG_TYPE_JOIN_REQUEST:
cevent = update_event(COROSYNC_EVENT_TYPE_JOIN_REQUEST,
&cmsg->sender, cmsg->msg, cmsg->msg_len);
if (!cevent)
break;
cevent->sender = cmsg->sender;
cevent->msg_len = cmsg->msg_len;
break;
case COROSYNC_MSG_TYPE_BLOCK:
case COROSYNC_MSG_TYPE_NOTIFY:
cevent = zalloc(sizeof(*cevent));
if (!cevent)
panic("failed to allocate memory\n");
if (cmsg->type == COROSYNC_MSG_TYPE_BLOCK)
cevent->type = COROSYNC_EVENT_TYPE_BLOCK;
else
cevent->type = COROSYNC_EVENT_TYPE_NOTIFY;
cevent->sender = cmsg->sender;
cevent->msg_len = cmsg->msg_len;
if (cmsg->msg_len) {
cevent->msg = zalloc(cmsg->msg_len);
if (!cevent->msg)
panic("failed to allocate memory\n");
memcpy(cevent->msg, cmsg->msg, cmsg->msg_len);
} else
cevent->msg = NULL;
list_add_tail(&cevent->list, &corosync_notify_list);
break;
case COROSYNC_MSG_TYPE_LEAVE:
cevent = zalloc(sizeof(*cevent));
if (!cevent)
panic("failed to allocate memory\n");
cevent->type = COROSYNC_EVENT_TYPE_LEAVE;
master = is_master(&cmsg->sender);
if (master >= 0)
/* Master is down before new nodes finish joining.
* We have to revoke its mastership to avoid cluster hanging
*/
cpg_nodes[master].gone = 1;
cevent->sender = cmsg->sender;
cevent->msg_len = cmsg->msg_len;
if (cmsg->msg_len) {
cevent->msg = xzalloc(cmsg->msg_len);
memcpy(cevent->msg, cmsg->msg, cmsg->msg_len);
} else
cevent->msg = NULL;
list_add_tail(&cevent->list, &corosync_confchg_list);
break;
case COROSYNC_MSG_TYPE_JOIN_RESPONSE:
cevent = update_event(COROSYNC_EVENT_TYPE_JOIN_REQUEST,
&cmsg->sender, cmsg->msg, cmsg->msg_len);
if (!cevent)
break;
cevent->type = COROSYNC_EVENT_TYPE_JOIN_RESPONSE;
cevent->result = cmsg->result;
cevent->nr_nodes = cmsg->nr_nodes;
memcpy(cevent->nodes, cmsg->nodes,
sizeof(*cmsg->nodes) * cmsg->nr_nodes);
break;
case COROSYNC_MSG_TYPE_UNBLOCK:
cevent = update_event(COROSYNC_EVENT_TYPE_BLOCK, &cmsg->sender,
cmsg->msg, cmsg->msg_len);
if (!cevent)
break;
cevent->type = COROSYNC_EVENT_TYPE_NOTIFY;
break;
}
__corosync_dispatch();
}
static void build_cpg_node_list(struct cpg_node *nodes,
const struct cpg_address *list, size_t nr)
{
int i;
for (i = 0; i < nr; i++) {
nodes[i].nodeid = list[i].nodeid;
nodes[i].pid = list[i].pid;
}
}
static void cdrv_cpg_confchg(cpg_handle_t handle,
const struct cpg_name *group_name,
const struct cpg_address *member_list,
size_t member_list_entries,
const struct cpg_address *left_list,
size_t left_list_entries,
const struct cpg_address *joined_list,
size_t joined_list_entries)
{
struct corosync_event *cevent;
int i;
struct cpg_node member_sheep[SD_MAX_NODES];
struct cpg_node joined_sheep[SD_MAX_NODES];
struct cpg_node left_sheep[SD_MAX_NODES];
int promote = 1;
dprintf("mem:%zu, joined:%zu, left:%zu\n",
member_list_entries, joined_list_entries,
left_list_entries);
/* convert cpg_address to cpg_node */
build_cpg_node_list(member_sheep, member_list, member_list_entries);
build_cpg_node_list(left_sheep, left_list, left_list_entries);
build_cpg_node_list(joined_sheep, joined_list, joined_list_entries);
/* dispatch leave_handler */
for (i = 0; i < left_list_entries; i++) {
int master;
cevent = find_event(COROSYNC_EVENT_TYPE_JOIN_REQUEST,
left_sheep + i);
if (cevent) {
/* the node left before joining */
list_del(&cevent->list);
free(cevent->msg);
free(cevent);
continue;
}
cevent = find_event(COROSYNC_EVENT_TYPE_BLOCK, left_sheep + i);
if (cevent) {
/* the node left before sending UNBLOCK */
list_del(&cevent->list);
free(cevent->msg);
free(cevent);
}
cevent = zalloc(sizeof(*cevent));
if (!cevent)
panic("failed to allocate memory\n");
master = is_master(&left_sheep[i]);
if (master >= 0)
/* Master is down before new nodes finish joining.
* We have to revoke its mastership to avoid cluster hanging
*/
cpg_nodes[master].gone = 1;
cevent->type = COROSYNC_EVENT_TYPE_LEAVE;
cevent->sender = left_sheep[i];
list_add_tail(&cevent->list, &corosync_confchg_list);
}
/* dispatch join_handler */
for (i = 0; i < joined_list_entries; i++) {
cevent = zalloc(sizeof(*cevent));
if (!cevent)
panic("failed to allocate memory\n");
cevent->type = COROSYNC_EVENT_TYPE_JOIN_REQUEST;
cevent->sender = joined_sheep[i];
list_add_tail(&cevent->list, &corosync_confchg_list);
}
if (!join_finished) {
/*
* Exactly one non-master member has seen join events for
* all other members, because events are ordered.
*/
for (i = 0; i < member_list_entries; i++) {
cevent = find_event(COROSYNC_EVENT_TYPE_JOIN_REQUEST,
&member_sheep[i]);
if (!cevent) {
dprintf("Not promoting because member is "
"not in our event list.\n");
promote = 0;
break;
}
}
/*
* If we see the join events for all nodes promote ourself to
* master right here.
*/
if (promote)
self_elect = 1;
}
__corosync_dispatch();
}
static int corosync_join(struct sd_node *myself,
void *opaque, size_t opaque_len)
{
int ret;
retry:
ret = cpg_join(cpg_handle, &cpg_group);
switch (ret) {
case CPG_OK:
break;
case CPG_ERR_TRY_AGAIN:
dprintf("failed to join the sheepdog group: retrying\n");
sleep(1);
goto retry;
case CPG_ERR_SECURITY:
eprintf("permission denied to join the sheepdog group\n");
return -1;
default:
eprintf("failed to join the sheepdog group (%d)\n", ret);
return -1;
}
this_node.ent = *myself;
ret = send_message(COROSYNC_MSG_TYPE_JOIN_REQUEST, 0, &this_node,
NULL, 0, opaque, opaque_len);
return ret;
}
static int corosync_leave(void)
{
return send_message(COROSYNC_MSG_TYPE_LEAVE, 0, &this_node, NULL, 0,
NULL, 0);
}
static void corosync_block(void)
{
send_message(COROSYNC_MSG_TYPE_BLOCK, 0, &this_node, NULL, 0,
NULL, 0);
}
static void corosync_unblock(void *msg, size_t msg_len)
{
send_message(COROSYNC_MSG_TYPE_UNBLOCK, 0, &this_node, NULL, 0,
msg, msg_len);
}
static int corosync_notify(void *msg, size_t msg_len)
{
return send_message(COROSYNC_MSG_TYPE_NOTIFY, 0, &this_node,
NULL, 0, msg, msg_len);
}
static void corosync_handler(int listen_fd, int events, void *data)
{
int ret;
if (events & EPOLLHUP) {
eprintf("corosync driver received EPOLLHUP event, exiting.\n");
goto out;
}
ret = cpg_dispatch(cpg_handle, CPG_DISPATCH_ALL);
if (ret != CPG_OK) {
eprintf("cpg_dispatch returned %d\n", ret);
goto out;
}
return;
out:
log_close();
exit(1);
}
static int corosync_init(const char *option)
{
int ret, fd;
uint32_t nodeid;
cpg_callbacks_t cb = {
.cpg_deliver_fn = cdrv_cpg_deliver,
.cpg_confchg_fn = cdrv_cpg_confchg
};
ret = cpg_initialize(&cpg_handle, &cb);
if (ret != CPG_OK) {
eprintf("failed to initialize cpg (%d) - "
"is corosync running?\n", ret);
return -1;
}
ret = corosync_cfg_initialize(&cfg_handle, NULL);
if (ret != CS_OK) {
vprintf(SDOG_ERR, "failed to initialize cfg (%d)\n", ret);
return -1;
}
ret = corosync_cfg_local_get(cfg_handle, &nodeid);
if (ret != CS_OK) {
vprintf(SDOG_ERR, "failed to get node id (%d)\n", ret);
return -1;
}
this_node.nodeid = nodeid;
this_node.pid = getpid();
ret = cpg_fd_get(cpg_handle, &fd);
if (ret != CPG_OK) {
eprintf("failed to get cpg file descriptor (%d)\n", ret);
return -1;
}
ret = register_event(fd, corosync_handler, NULL);
if (ret) {
eprintf("failed to register corosync event handler (%d)\n",
ret);
return -1;
}
return 0;
}
struct cluster_driver cdrv_corosync = {
.name = "corosync",
.init = corosync_init,
.get_local_addr = corosync_get_local_addr,
.join = corosync_join,
.leave = corosync_leave,
.notify = corosync_notify,
.block = corosync_block,
.unblock = corosync_unblock,
};
cdrv_register(cdrv_corosync);