mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-26 19:00:25 +00:00
![Alexander Aring](/assets/img/avatar_default.png)
This patch fixes some grammar output in lowcomms implementation by removing the "successful" word which should be "successfully" but it can never be unsuccessfully so we remove it. Signed-off-by: Alexander Aring <aahringo@redhat.com> Signed-off-by: David Teigland <teigland@redhat.com>
2042 lines
47 KiB
C
2042 lines
47 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/******************************************************************************
|
|
*******************************************************************************
|
|
**
|
|
** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
|
|
** Copyright (C) 2004-2009 Red Hat, Inc. All rights reserved.
|
|
**
|
|
**
|
|
*******************************************************************************
|
|
******************************************************************************/
|
|
|
|
/*
|
|
* lowcomms.c
|
|
*
|
|
* This is the "low-level" comms layer.
|
|
*
|
|
* It is responsible for sending/receiving messages
|
|
* from other nodes in the cluster.
|
|
*
|
|
* Cluster nodes are referred to by their nodeids. nodeids are
|
|
* simply 32 bit numbers to the locking module - if they need to
|
|
* be expanded for the cluster infrastructure then that is its
|
|
* responsibility. It is this layer's
|
|
* responsibility to resolve these into IP address or
|
|
* whatever it needs for inter-node communication.
|
|
*
|
|
* The comms level is two kernel threads that deal mainly with
|
|
* the receiving of messages from other nodes and passing them
|
|
* up to the mid-level comms layer (which understands the
|
|
* message format) for execution by the locking core, and
|
|
* a send thread which does all the setting up of connections
|
|
* to remote nodes and the sending of data. Threads are not allowed
|
|
* to send their own data because it may cause them to wait in times
|
|
* of high load. Also, this way, the sending thread can collect together
|
|
* messages bound for one node and send them in one block.
|
|
*
|
|
* lowcomms will choose to use either TCP or SCTP as its transport layer
|
|
* depending on the configuration variable 'protocol'. This should be set
|
|
* to 0 (default) for TCP or 1 for SCTP. It should be configured using a
|
|
* cluster-wide mechanism as it must be the same on all nodes of the cluster
|
|
* for the DLM to function.
|
|
*
|
|
*/
|
|
|
|
#include <asm/ioctls.h>
|
|
#include <net/sock.h>
|
|
#include <net/tcp.h>
|
|
#include <linux/pagemap.h>
|
|
#include <linux/file.h>
|
|
#include <linux/mutex.h>
|
|
#include <linux/sctp.h>
|
|
#include <linux/slab.h>
|
|
#include <net/sctp/sctp.h>
|
|
#include <net/ipv6.h>
|
|
|
|
#include <trace/events/dlm.h>
|
|
|
|
#include "dlm_internal.h"
|
|
#include "lowcomms.h"
|
|
#include "midcomms.h"
|
|
#include "memory.h"
|
|
#include "config.h"
|
|
|
|
#define NEEDED_RMEM (4*1024*1024)
|
|
|
|
/* Number of messages to send before rescheduling */
|
|
#define MAX_SEND_MSG_COUNT 25
|
|
#define DLM_SHUTDOWN_WAIT_TIMEOUT msecs_to_jiffies(10000)
|
|
|
|
struct connection {
|
|
struct socket *sock; /* NULL if not connected */
|
|
uint32_t nodeid; /* So we know who we are in the list */
|
|
struct mutex sock_mutex;
|
|
unsigned long flags;
|
|
#define CF_READ_PENDING 1
|
|
#define CF_WRITE_PENDING 2
|
|
#define CF_INIT_PENDING 4
|
|
#define CF_IS_OTHERCON 5
|
|
#define CF_CLOSE 6
|
|
#define CF_APP_LIMITED 7
|
|
#define CF_CLOSING 8
|
|
#define CF_SHUTDOWN 9
|
|
#define CF_CONNECTED 10
|
|
#define CF_RECONNECT 11
|
|
#define CF_DELAY_CONNECT 12
|
|
#define CF_EOF 13
|
|
struct list_head writequeue; /* List of outgoing writequeue_entries */
|
|
spinlock_t writequeue_lock;
|
|
atomic_t writequeue_cnt;
|
|
int retries;
|
|
#define MAX_CONNECT_RETRIES 3
|
|
struct hlist_node list;
|
|
struct connection *othercon;
|
|
struct connection *sendcon;
|
|
struct work_struct rwork; /* Receive workqueue */
|
|
struct work_struct swork; /* Send workqueue */
|
|
wait_queue_head_t shutdown_wait; /* wait for graceful shutdown */
|
|
unsigned char *rx_buf;
|
|
int rx_buflen;
|
|
int rx_leftover;
|
|
struct rcu_head rcu;
|
|
};
|
|
#define sock2con(x) ((struct connection *)(x)->sk_user_data)
|
|
|
|
struct listen_connection {
|
|
struct socket *sock;
|
|
struct work_struct rwork;
|
|
};
|
|
|
|
#define DLM_WQ_REMAIN_BYTES(e) (PAGE_SIZE - e->end)
|
|
#define DLM_WQ_LENGTH_BYTES(e) (e->end - e->offset)
|
|
|
|
/* An entry waiting to be sent */
|
|
struct writequeue_entry {
|
|
struct list_head list;
|
|
struct page *page;
|
|
int offset;
|
|
int len;
|
|
int end;
|
|
int users;
|
|
bool dirty;
|
|
struct connection *con;
|
|
struct list_head msgs;
|
|
struct kref ref;
|
|
};
|
|
|
|
struct dlm_msg {
|
|
struct writequeue_entry *entry;
|
|
struct dlm_msg *orig_msg;
|
|
bool retransmit;
|
|
void *ppc;
|
|
int len;
|
|
int idx; /* new()/commit() idx exchange */
|
|
|
|
struct list_head list;
|
|
struct kref ref;
|
|
};
|
|
|
|
struct dlm_node_addr {
|
|
struct list_head list;
|
|
int nodeid;
|
|
int mark;
|
|
int addr_count;
|
|
int curr_addr_index;
|
|
struct sockaddr_storage *addr[DLM_MAX_ADDR_COUNT];
|
|
};
|
|
|
|
struct dlm_proto_ops {
|
|
bool try_new_addr;
|
|
const char *name;
|
|
int proto;
|
|
|
|
int (*connect)(struct connection *con, struct socket *sock,
|
|
struct sockaddr *addr, int addr_len);
|
|
void (*sockopts)(struct socket *sock);
|
|
int (*bind)(struct socket *sock);
|
|
int (*listen_validate)(void);
|
|
void (*listen_sockopts)(struct socket *sock);
|
|
int (*listen_bind)(struct socket *sock);
|
|
/* What to do to shutdown */
|
|
void (*shutdown_action)(struct connection *con);
|
|
/* What to do to eof check */
|
|
bool (*eof_condition)(struct connection *con);
|
|
};
|
|
|
|
static struct listen_sock_callbacks {
|
|
void (*sk_error_report)(struct sock *);
|
|
void (*sk_data_ready)(struct sock *);
|
|
void (*sk_state_change)(struct sock *);
|
|
void (*sk_write_space)(struct sock *);
|
|
} listen_sock;
|
|
|
|
static LIST_HEAD(dlm_node_addrs);
|
|
static DEFINE_SPINLOCK(dlm_node_addrs_spin);
|
|
|
|
static struct listen_connection listen_con;
|
|
static struct sockaddr_storage *dlm_local_addr[DLM_MAX_ADDR_COUNT];
|
|
static int dlm_local_count;
|
|
int dlm_allow_conn;
|
|
|
|
/* Work queues */
|
|
static struct workqueue_struct *recv_workqueue;
|
|
static struct workqueue_struct *send_workqueue;
|
|
|
|
static struct hlist_head connection_hash[CONN_HASH_SIZE];
|
|
static DEFINE_SPINLOCK(connections_lock);
|
|
DEFINE_STATIC_SRCU(connections_srcu);
|
|
|
|
static const struct dlm_proto_ops *dlm_proto_ops;
|
|
|
|
static void process_recv_sockets(struct work_struct *work);
|
|
static void process_send_sockets(struct work_struct *work);
|
|
|
|
static void writequeue_entry_ctor(void *data)
|
|
{
|
|
struct writequeue_entry *entry = data;
|
|
|
|
INIT_LIST_HEAD(&entry->msgs);
|
|
}
|
|
|
|
struct kmem_cache *dlm_lowcomms_writequeue_cache_create(void)
|
|
{
|
|
return kmem_cache_create("dlm_writequeue", sizeof(struct writequeue_entry),
|
|
0, 0, writequeue_entry_ctor);
|
|
}
|
|
|
|
struct kmem_cache *dlm_lowcomms_msg_cache_create(void)
|
|
{
|
|
return kmem_cache_create("dlm_msg", sizeof(struct dlm_msg), 0, 0, NULL);
|
|
}
|
|
|
|
/* need to held writequeue_lock */
|
|
static struct writequeue_entry *con_next_wq(struct connection *con)
|
|
{
|
|
struct writequeue_entry *e;
|
|
|
|
if (list_empty(&con->writequeue))
|
|
return NULL;
|
|
|
|
e = list_first_entry(&con->writequeue, struct writequeue_entry,
|
|
list);
|
|
/* if len is zero nothing is to send, if there are users filling
|
|
* buffers we wait until the users are done so we can send more.
|
|
*/
|
|
if (e->users || e->len == 0)
|
|
return NULL;
|
|
|
|
return e;
|
|
}
|
|
|
|
static struct connection *__find_con(int nodeid, int r)
|
|
{
|
|
struct connection *con;
|
|
|
|
hlist_for_each_entry_rcu(con, &connection_hash[r], list) {
|
|
if (con->nodeid == nodeid)
|
|
return con;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static bool tcp_eof_condition(struct connection *con)
|
|
{
|
|
return atomic_read(&con->writequeue_cnt);
|
|
}
|
|
|
|
static int dlm_con_init(struct connection *con, int nodeid)
|
|
{
|
|
con->rx_buflen = dlm_config.ci_buffer_size;
|
|
con->rx_buf = kmalloc(con->rx_buflen, GFP_NOFS);
|
|
if (!con->rx_buf)
|
|
return -ENOMEM;
|
|
|
|
con->nodeid = nodeid;
|
|
mutex_init(&con->sock_mutex);
|
|
INIT_LIST_HEAD(&con->writequeue);
|
|
spin_lock_init(&con->writequeue_lock);
|
|
atomic_set(&con->writequeue_cnt, 0);
|
|
INIT_WORK(&con->swork, process_send_sockets);
|
|
INIT_WORK(&con->rwork, process_recv_sockets);
|
|
init_waitqueue_head(&con->shutdown_wait);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* If 'allocation' is zero then we don't attempt to create a new
|
|
* connection structure for this node.
|
|
*/
|
|
static struct connection *nodeid2con(int nodeid, gfp_t alloc)
|
|
{
|
|
struct connection *con, *tmp;
|
|
int r, ret;
|
|
|
|
r = nodeid_hash(nodeid);
|
|
con = __find_con(nodeid, r);
|
|
if (con || !alloc)
|
|
return con;
|
|
|
|
con = kzalloc(sizeof(*con), alloc);
|
|
if (!con)
|
|
return NULL;
|
|
|
|
ret = dlm_con_init(con, nodeid);
|
|
if (ret) {
|
|
kfree(con);
|
|
return NULL;
|
|
}
|
|
|
|
spin_lock(&connections_lock);
|
|
/* Because multiple workqueues/threads calls this function it can
|
|
* race on multiple cpu's. Instead of locking hot path __find_con()
|
|
* we just check in rare cases of recently added nodes again
|
|
* under protection of connections_lock. If this is the case we
|
|
* abort our connection creation and return the existing connection.
|
|
*/
|
|
tmp = __find_con(nodeid, r);
|
|
if (tmp) {
|
|
spin_unlock(&connections_lock);
|
|
kfree(con->rx_buf);
|
|
kfree(con);
|
|
return tmp;
|
|
}
|
|
|
|
hlist_add_head_rcu(&con->list, &connection_hash[r]);
|
|
spin_unlock(&connections_lock);
|
|
|
|
return con;
|
|
}
|
|
|
|
/* Loop round all connections */
|
|
static void foreach_conn(void (*conn_func)(struct connection *c))
|
|
{
|
|
int i;
|
|
struct connection *con;
|
|
|
|
for (i = 0; i < CONN_HASH_SIZE; i++) {
|
|
hlist_for_each_entry_rcu(con, &connection_hash[i], list)
|
|
conn_func(con);
|
|
}
|
|
}
|
|
|
|
static struct dlm_node_addr *find_node_addr(int nodeid)
|
|
{
|
|
struct dlm_node_addr *na;
|
|
|
|
list_for_each_entry(na, &dlm_node_addrs, list) {
|
|
if (na->nodeid == nodeid)
|
|
return na;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static int addr_compare(const struct sockaddr_storage *x,
|
|
const struct sockaddr_storage *y)
|
|
{
|
|
switch (x->ss_family) {
|
|
case AF_INET: {
|
|
struct sockaddr_in *sinx = (struct sockaddr_in *)x;
|
|
struct sockaddr_in *siny = (struct sockaddr_in *)y;
|
|
if (sinx->sin_addr.s_addr != siny->sin_addr.s_addr)
|
|
return 0;
|
|
if (sinx->sin_port != siny->sin_port)
|
|
return 0;
|
|
break;
|
|
}
|
|
case AF_INET6: {
|
|
struct sockaddr_in6 *sinx = (struct sockaddr_in6 *)x;
|
|
struct sockaddr_in6 *siny = (struct sockaddr_in6 *)y;
|
|
if (!ipv6_addr_equal(&sinx->sin6_addr, &siny->sin6_addr))
|
|
return 0;
|
|
if (sinx->sin6_port != siny->sin6_port)
|
|
return 0;
|
|
break;
|
|
}
|
|
default:
|
|
return 0;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
static int nodeid_to_addr(int nodeid, struct sockaddr_storage *sas_out,
|
|
struct sockaddr *sa_out, bool try_new_addr,
|
|
unsigned int *mark)
|
|
{
|
|
struct sockaddr_storage sas;
|
|
struct dlm_node_addr *na;
|
|
|
|
if (!dlm_local_count)
|
|
return -1;
|
|
|
|
spin_lock(&dlm_node_addrs_spin);
|
|
na = find_node_addr(nodeid);
|
|
if (na && na->addr_count) {
|
|
memcpy(&sas, na->addr[na->curr_addr_index],
|
|
sizeof(struct sockaddr_storage));
|
|
|
|
if (try_new_addr) {
|
|
na->curr_addr_index++;
|
|
if (na->curr_addr_index == na->addr_count)
|
|
na->curr_addr_index = 0;
|
|
}
|
|
}
|
|
spin_unlock(&dlm_node_addrs_spin);
|
|
|
|
if (!na)
|
|
return -EEXIST;
|
|
|
|
if (!na->addr_count)
|
|
return -ENOENT;
|
|
|
|
*mark = na->mark;
|
|
|
|
if (sas_out)
|
|
memcpy(sas_out, &sas, sizeof(struct sockaddr_storage));
|
|
|
|
if (!sa_out)
|
|
return 0;
|
|
|
|
if (dlm_local_addr[0]->ss_family == AF_INET) {
|
|
struct sockaddr_in *in4 = (struct sockaddr_in *) &sas;
|
|
struct sockaddr_in *ret4 = (struct sockaddr_in *) sa_out;
|
|
ret4->sin_addr.s_addr = in4->sin_addr.s_addr;
|
|
} else {
|
|
struct sockaddr_in6 *in6 = (struct sockaddr_in6 *) &sas;
|
|
struct sockaddr_in6 *ret6 = (struct sockaddr_in6 *) sa_out;
|
|
ret6->sin6_addr = in6->sin6_addr;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int addr_to_nodeid(struct sockaddr_storage *addr, int *nodeid,
|
|
unsigned int *mark)
|
|
{
|
|
struct dlm_node_addr *na;
|
|
int rv = -EEXIST;
|
|
int addr_i;
|
|
|
|
spin_lock(&dlm_node_addrs_spin);
|
|
list_for_each_entry(na, &dlm_node_addrs, list) {
|
|
if (!na->addr_count)
|
|
continue;
|
|
|
|
for (addr_i = 0; addr_i < na->addr_count; addr_i++) {
|
|
if (addr_compare(na->addr[addr_i], addr)) {
|
|
*nodeid = na->nodeid;
|
|
*mark = na->mark;
|
|
rv = 0;
|
|
goto unlock;
|
|
}
|
|
}
|
|
}
|
|
unlock:
|
|
spin_unlock(&dlm_node_addrs_spin);
|
|
return rv;
|
|
}
|
|
|
|
/* caller need to held dlm_node_addrs_spin lock */
|
|
static bool dlm_lowcomms_na_has_addr(const struct dlm_node_addr *na,
|
|
const struct sockaddr_storage *addr)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < na->addr_count; i++) {
|
|
if (addr_compare(na->addr[i], addr))
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
int dlm_lowcomms_addr(int nodeid, struct sockaddr_storage *addr, int len)
|
|
{
|
|
struct sockaddr_storage *new_addr;
|
|
struct dlm_node_addr *new_node, *na;
|
|
bool ret;
|
|
|
|
new_node = kzalloc(sizeof(struct dlm_node_addr), GFP_NOFS);
|
|
if (!new_node)
|
|
return -ENOMEM;
|
|
|
|
new_addr = kzalloc(sizeof(struct sockaddr_storage), GFP_NOFS);
|
|
if (!new_addr) {
|
|
kfree(new_node);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
memcpy(new_addr, addr, len);
|
|
|
|
spin_lock(&dlm_node_addrs_spin);
|
|
na = find_node_addr(nodeid);
|
|
if (!na) {
|
|
new_node->nodeid = nodeid;
|
|
new_node->addr[0] = new_addr;
|
|
new_node->addr_count = 1;
|
|
new_node->mark = dlm_config.ci_mark;
|
|
list_add(&new_node->list, &dlm_node_addrs);
|
|
spin_unlock(&dlm_node_addrs_spin);
|
|
return 0;
|
|
}
|
|
|
|
ret = dlm_lowcomms_na_has_addr(na, addr);
|
|
if (ret) {
|
|
spin_unlock(&dlm_node_addrs_spin);
|
|
kfree(new_addr);
|
|
kfree(new_node);
|
|
return -EEXIST;
|
|
}
|
|
|
|
if (na->addr_count >= DLM_MAX_ADDR_COUNT) {
|
|
spin_unlock(&dlm_node_addrs_spin);
|
|
kfree(new_addr);
|
|
kfree(new_node);
|
|
return -ENOSPC;
|
|
}
|
|
|
|
na->addr[na->addr_count++] = new_addr;
|
|
spin_unlock(&dlm_node_addrs_spin);
|
|
kfree(new_node);
|
|
return 0;
|
|
}
|
|
|
|
/* Data available on socket or listen socket received a connect */
|
|
static void lowcomms_data_ready(struct sock *sk)
|
|
{
|
|
struct connection *con;
|
|
|
|
con = sock2con(sk);
|
|
if (con && !test_and_set_bit(CF_READ_PENDING, &con->flags))
|
|
queue_work(recv_workqueue, &con->rwork);
|
|
}
|
|
|
|
static void lowcomms_listen_data_ready(struct sock *sk)
|
|
{
|
|
if (!dlm_allow_conn)
|
|
return;
|
|
|
|
queue_work(recv_workqueue, &listen_con.rwork);
|
|
}
|
|
|
|
static void lowcomms_write_space(struct sock *sk)
|
|
{
|
|
struct connection *con;
|
|
|
|
con = sock2con(sk);
|
|
if (!con)
|
|
return;
|
|
|
|
if (!test_and_set_bit(CF_CONNECTED, &con->flags)) {
|
|
log_print("connected to node %d", con->nodeid);
|
|
queue_work(send_workqueue, &con->swork);
|
|
return;
|
|
}
|
|
|
|
clear_bit(SOCK_NOSPACE, &con->sock->flags);
|
|
|
|
if (test_and_clear_bit(CF_APP_LIMITED, &con->flags)) {
|
|
con->sock->sk->sk_write_pending--;
|
|
clear_bit(SOCKWQ_ASYNC_NOSPACE, &con->sock->flags);
|
|
}
|
|
|
|
queue_work(send_workqueue, &con->swork);
|
|
}
|
|
|
|
static inline void lowcomms_connect_sock(struct connection *con)
|
|
{
|
|
if (test_bit(CF_CLOSE, &con->flags))
|
|
return;
|
|
queue_work(send_workqueue, &con->swork);
|
|
cond_resched();
|
|
}
|
|
|
|
static void lowcomms_state_change(struct sock *sk)
|
|
{
|
|
/* SCTP layer is not calling sk_data_ready when the connection
|
|
* is done, so we catch the signal through here. Also, it
|
|
* doesn't switch socket state when entering shutdown, so we
|
|
* skip the write in that case.
|
|
*/
|
|
if (sk->sk_shutdown) {
|
|
if (sk->sk_shutdown == RCV_SHUTDOWN)
|
|
lowcomms_data_ready(sk);
|
|
} else if (sk->sk_state == TCP_ESTABLISHED) {
|
|
lowcomms_write_space(sk);
|
|
}
|
|
}
|
|
|
|
int dlm_lowcomms_connect_node(int nodeid)
|
|
{
|
|
struct connection *con;
|
|
int idx;
|
|
|
|
if (nodeid == dlm_our_nodeid())
|
|
return 0;
|
|
|
|
idx = srcu_read_lock(&connections_srcu);
|
|
con = nodeid2con(nodeid, GFP_NOFS);
|
|
if (!con) {
|
|
srcu_read_unlock(&connections_srcu, idx);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
lowcomms_connect_sock(con);
|
|
srcu_read_unlock(&connections_srcu, idx);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int dlm_lowcomms_nodes_set_mark(int nodeid, unsigned int mark)
|
|
{
|
|
struct dlm_node_addr *na;
|
|
|
|
spin_lock(&dlm_node_addrs_spin);
|
|
na = find_node_addr(nodeid);
|
|
if (!na) {
|
|
spin_unlock(&dlm_node_addrs_spin);
|
|
return -ENOENT;
|
|
}
|
|
|
|
na->mark = mark;
|
|
spin_unlock(&dlm_node_addrs_spin);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void lowcomms_error_report(struct sock *sk)
|
|
{
|
|
struct connection *con;
|
|
void (*orig_report)(struct sock *) = NULL;
|
|
struct inet_sock *inet;
|
|
|
|
con = sock2con(sk);
|
|
if (con == NULL)
|
|
goto out;
|
|
|
|
orig_report = listen_sock.sk_error_report;
|
|
|
|
inet = inet_sk(sk);
|
|
switch (sk->sk_family) {
|
|
case AF_INET:
|
|
printk_ratelimited(KERN_ERR "dlm: node %d: socket error "
|
|
"sending to node %d at %pI4, dport %d, "
|
|
"sk_err=%d/%d\n", dlm_our_nodeid(),
|
|
con->nodeid, &inet->inet_daddr,
|
|
ntohs(inet->inet_dport), sk->sk_err,
|
|
sk->sk_err_soft);
|
|
break;
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
case AF_INET6:
|
|
printk_ratelimited(KERN_ERR "dlm: node %d: socket error "
|
|
"sending to node %d at %pI6c, "
|
|
"dport %d, sk_err=%d/%d\n", dlm_our_nodeid(),
|
|
con->nodeid, &sk->sk_v6_daddr,
|
|
ntohs(inet->inet_dport), sk->sk_err,
|
|
sk->sk_err_soft);
|
|
break;
|
|
#endif
|
|
default:
|
|
printk_ratelimited(KERN_ERR "dlm: node %d: socket error "
|
|
"invalid socket family %d set, "
|
|
"sk_err=%d/%d\n", dlm_our_nodeid(),
|
|
sk->sk_family, sk->sk_err, sk->sk_err_soft);
|
|
goto out;
|
|
}
|
|
|
|
/* below sendcon only handling */
|
|
if (test_bit(CF_IS_OTHERCON, &con->flags))
|
|
con = con->sendcon;
|
|
|
|
switch (sk->sk_err) {
|
|
case ECONNREFUSED:
|
|
set_bit(CF_DELAY_CONNECT, &con->flags);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
if (!test_and_set_bit(CF_RECONNECT, &con->flags))
|
|
queue_work(send_workqueue, &con->swork);
|
|
|
|
out:
|
|
if (orig_report)
|
|
orig_report(sk);
|
|
}
|
|
|
|
/* Note: sk_callback_lock must be locked before calling this function. */
|
|
static void save_listen_callbacks(struct socket *sock)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
|
|
listen_sock.sk_data_ready = sk->sk_data_ready;
|
|
listen_sock.sk_state_change = sk->sk_state_change;
|
|
listen_sock.sk_write_space = sk->sk_write_space;
|
|
listen_sock.sk_error_report = sk->sk_error_report;
|
|
}
|
|
|
|
static void restore_callbacks(struct socket *sock)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
|
|
lock_sock(sk);
|
|
sk->sk_user_data = NULL;
|
|
sk->sk_data_ready = listen_sock.sk_data_ready;
|
|
sk->sk_state_change = listen_sock.sk_state_change;
|
|
sk->sk_write_space = listen_sock.sk_write_space;
|
|
sk->sk_error_report = listen_sock.sk_error_report;
|
|
release_sock(sk);
|
|
}
|
|
|
|
static void add_listen_sock(struct socket *sock, struct listen_connection *con)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
|
|
lock_sock(sk);
|
|
save_listen_callbacks(sock);
|
|
con->sock = sock;
|
|
|
|
sk->sk_user_data = con;
|
|
sk->sk_allocation = GFP_NOFS;
|
|
/* Install a data_ready callback */
|
|
sk->sk_data_ready = lowcomms_listen_data_ready;
|
|
release_sock(sk);
|
|
}
|
|
|
|
/* Make a socket active */
|
|
static void add_sock(struct socket *sock, struct connection *con)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
|
|
lock_sock(sk);
|
|
con->sock = sock;
|
|
|
|
sk->sk_user_data = con;
|
|
/* Install a data_ready callback */
|
|
sk->sk_data_ready = lowcomms_data_ready;
|
|
sk->sk_write_space = lowcomms_write_space;
|
|
sk->sk_state_change = lowcomms_state_change;
|
|
sk->sk_allocation = GFP_NOFS;
|
|
sk->sk_error_report = lowcomms_error_report;
|
|
release_sock(sk);
|
|
}
|
|
|
|
/* Add the port number to an IPv6 or 4 sockaddr and return the address
|
|
length */
|
|
static void make_sockaddr(struct sockaddr_storage *saddr, uint16_t port,
|
|
int *addr_len)
|
|
{
|
|
saddr->ss_family = dlm_local_addr[0]->ss_family;
|
|
if (saddr->ss_family == AF_INET) {
|
|
struct sockaddr_in *in4_addr = (struct sockaddr_in *)saddr;
|
|
in4_addr->sin_port = cpu_to_be16(port);
|
|
*addr_len = sizeof(struct sockaddr_in);
|
|
memset(&in4_addr->sin_zero, 0, sizeof(in4_addr->sin_zero));
|
|
} else {
|
|
struct sockaddr_in6 *in6_addr = (struct sockaddr_in6 *)saddr;
|
|
in6_addr->sin6_port = cpu_to_be16(port);
|
|
*addr_len = sizeof(struct sockaddr_in6);
|
|
}
|
|
memset((char *)saddr + *addr_len, 0, sizeof(struct sockaddr_storage) - *addr_len);
|
|
}
|
|
|
|
static void dlm_page_release(struct kref *kref)
|
|
{
|
|
struct writequeue_entry *e = container_of(kref, struct writequeue_entry,
|
|
ref);
|
|
|
|
__free_page(e->page);
|
|
dlm_free_writequeue(e);
|
|
}
|
|
|
|
static void dlm_msg_release(struct kref *kref)
|
|
{
|
|
struct dlm_msg *msg = container_of(kref, struct dlm_msg, ref);
|
|
|
|
kref_put(&msg->entry->ref, dlm_page_release);
|
|
dlm_free_msg(msg);
|
|
}
|
|
|
|
static void free_entry(struct writequeue_entry *e)
|
|
{
|
|
struct dlm_msg *msg, *tmp;
|
|
|
|
list_for_each_entry_safe(msg, tmp, &e->msgs, list) {
|
|
if (msg->orig_msg) {
|
|
msg->orig_msg->retransmit = false;
|
|
kref_put(&msg->orig_msg->ref, dlm_msg_release);
|
|
}
|
|
|
|
list_del(&msg->list);
|
|
kref_put(&msg->ref, dlm_msg_release);
|
|
}
|
|
|
|
list_del(&e->list);
|
|
atomic_dec(&e->con->writequeue_cnt);
|
|
kref_put(&e->ref, dlm_page_release);
|
|
}
|
|
|
|
static void dlm_close_sock(struct socket **sock)
|
|
{
|
|
if (*sock) {
|
|
restore_callbacks(*sock);
|
|
sock_release(*sock);
|
|
*sock = NULL;
|
|
}
|
|
}
|
|
|
|
/* Close a remote connection and tidy up */
|
|
static void close_connection(struct connection *con, bool and_other,
|
|
bool tx, bool rx)
|
|
{
|
|
bool closing = test_and_set_bit(CF_CLOSING, &con->flags);
|
|
struct writequeue_entry *e;
|
|
|
|
if (tx && !closing && cancel_work_sync(&con->swork)) {
|
|
log_print("canceled swork for node %d", con->nodeid);
|
|
clear_bit(CF_WRITE_PENDING, &con->flags);
|
|
}
|
|
if (rx && !closing && cancel_work_sync(&con->rwork)) {
|
|
log_print("canceled rwork for node %d", con->nodeid);
|
|
clear_bit(CF_READ_PENDING, &con->flags);
|
|
}
|
|
|
|
mutex_lock(&con->sock_mutex);
|
|
dlm_close_sock(&con->sock);
|
|
|
|
if (con->othercon && and_other) {
|
|
/* Will only re-enter once. */
|
|
close_connection(con->othercon, false, tx, rx);
|
|
}
|
|
|
|
/* if we send a writequeue entry only a half way, we drop the
|
|
* whole entry because reconnection and that we not start of the
|
|
* middle of a msg which will confuse the other end.
|
|
*
|
|
* we can always drop messages because retransmits, but what we
|
|
* cannot allow is to transmit half messages which may be processed
|
|
* at the other side.
|
|
*
|
|
* our policy is to start on a clean state when disconnects, we don't
|
|
* know what's send/received on transport layer in this case.
|
|
*/
|
|
spin_lock(&con->writequeue_lock);
|
|
if (!list_empty(&con->writequeue)) {
|
|
e = list_first_entry(&con->writequeue, struct writequeue_entry,
|
|
list);
|
|
if (e->dirty)
|
|
free_entry(e);
|
|
}
|
|
spin_unlock(&con->writequeue_lock);
|
|
|
|
con->rx_leftover = 0;
|
|
con->retries = 0;
|
|
clear_bit(CF_APP_LIMITED, &con->flags);
|
|
clear_bit(CF_CONNECTED, &con->flags);
|
|
clear_bit(CF_DELAY_CONNECT, &con->flags);
|
|
clear_bit(CF_RECONNECT, &con->flags);
|
|
clear_bit(CF_EOF, &con->flags);
|
|
mutex_unlock(&con->sock_mutex);
|
|
clear_bit(CF_CLOSING, &con->flags);
|
|
}
|
|
|
|
static void shutdown_connection(struct connection *con)
|
|
{
|
|
int ret;
|
|
|
|
flush_work(&con->swork);
|
|
|
|
mutex_lock(&con->sock_mutex);
|
|
/* nothing to shutdown */
|
|
if (!con->sock) {
|
|
mutex_unlock(&con->sock_mutex);
|
|
return;
|
|
}
|
|
|
|
set_bit(CF_SHUTDOWN, &con->flags);
|
|
ret = kernel_sock_shutdown(con->sock, SHUT_WR);
|
|
mutex_unlock(&con->sock_mutex);
|
|
if (ret) {
|
|
log_print("Connection %p failed to shutdown: %d will force close",
|
|
con, ret);
|
|
goto force_close;
|
|
} else {
|
|
ret = wait_event_timeout(con->shutdown_wait,
|
|
!test_bit(CF_SHUTDOWN, &con->flags),
|
|
DLM_SHUTDOWN_WAIT_TIMEOUT);
|
|
if (ret == 0) {
|
|
log_print("Connection %p shutdown timed out, will force close",
|
|
con);
|
|
goto force_close;
|
|
}
|
|
}
|
|
|
|
return;
|
|
|
|
force_close:
|
|
clear_bit(CF_SHUTDOWN, &con->flags);
|
|
close_connection(con, false, true, true);
|
|
}
|
|
|
|
static void dlm_tcp_shutdown(struct connection *con)
|
|
{
|
|
if (con->othercon)
|
|
shutdown_connection(con->othercon);
|
|
shutdown_connection(con);
|
|
}
|
|
|
|
static int con_realloc_receive_buf(struct connection *con, int newlen)
|
|
{
|
|
unsigned char *newbuf;
|
|
|
|
newbuf = kmalloc(newlen, GFP_NOFS);
|
|
if (!newbuf)
|
|
return -ENOMEM;
|
|
|
|
/* copy any leftover from last receive */
|
|
if (con->rx_leftover)
|
|
memmove(newbuf, con->rx_buf, con->rx_leftover);
|
|
|
|
/* swap to new buffer space */
|
|
kfree(con->rx_buf);
|
|
con->rx_buflen = newlen;
|
|
con->rx_buf = newbuf;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Data received from remote end */
|
|
static int receive_from_sock(struct connection *con)
|
|
{
|
|
struct msghdr msg;
|
|
struct kvec iov;
|
|
int ret, buflen;
|
|
|
|
mutex_lock(&con->sock_mutex);
|
|
|
|
if (con->sock == NULL) {
|
|
ret = -EAGAIN;
|
|
goto out_close;
|
|
}
|
|
|
|
/* realloc if we get new buffer size to read out */
|
|
buflen = dlm_config.ci_buffer_size;
|
|
if (con->rx_buflen != buflen && con->rx_leftover <= buflen) {
|
|
ret = con_realloc_receive_buf(con, buflen);
|
|
if (ret < 0)
|
|
goto out_resched;
|
|
}
|
|
|
|
for (;;) {
|
|
/* calculate new buffer parameter regarding last receive and
|
|
* possible leftover bytes
|
|
*/
|
|
iov.iov_base = con->rx_buf + con->rx_leftover;
|
|
iov.iov_len = con->rx_buflen - con->rx_leftover;
|
|
|
|
memset(&msg, 0, sizeof(msg));
|
|
msg.msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL;
|
|
ret = kernel_recvmsg(con->sock, &msg, &iov, 1, iov.iov_len,
|
|
msg.msg_flags);
|
|
trace_dlm_recv(con->nodeid, ret);
|
|
if (ret == -EAGAIN)
|
|
break;
|
|
else if (ret <= 0)
|
|
goto out_close;
|
|
|
|
/* new buflen according readed bytes and leftover from last receive */
|
|
buflen = ret + con->rx_leftover;
|
|
ret = dlm_process_incoming_buffer(con->nodeid, con->rx_buf, buflen);
|
|
if (ret < 0)
|
|
goto out_close;
|
|
|
|
/* calculate leftover bytes from process and put it into begin of
|
|
* the receive buffer, so next receive we have the full message
|
|
* at the start address of the receive buffer.
|
|
*/
|
|
con->rx_leftover = buflen - ret;
|
|
if (con->rx_leftover) {
|
|
memmove(con->rx_buf, con->rx_buf + ret,
|
|
con->rx_leftover);
|
|
}
|
|
}
|
|
|
|
dlm_midcomms_receive_done(con->nodeid);
|
|
mutex_unlock(&con->sock_mutex);
|
|
return 0;
|
|
|
|
out_resched:
|
|
if (!test_and_set_bit(CF_READ_PENDING, &con->flags))
|
|
queue_work(recv_workqueue, &con->rwork);
|
|
mutex_unlock(&con->sock_mutex);
|
|
return -EAGAIN;
|
|
|
|
out_close:
|
|
if (ret == 0) {
|
|
log_print("connection %p got EOF from %d",
|
|
con, con->nodeid);
|
|
|
|
if (dlm_proto_ops->eof_condition &&
|
|
dlm_proto_ops->eof_condition(con)) {
|
|
set_bit(CF_EOF, &con->flags);
|
|
mutex_unlock(&con->sock_mutex);
|
|
} else {
|
|
mutex_unlock(&con->sock_mutex);
|
|
close_connection(con, false, true, false);
|
|
|
|
/* handling for tcp shutdown */
|
|
clear_bit(CF_SHUTDOWN, &con->flags);
|
|
wake_up(&con->shutdown_wait);
|
|
}
|
|
|
|
/* signal to breaking receive worker */
|
|
ret = -1;
|
|
} else {
|
|
mutex_unlock(&con->sock_mutex);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
/* Listening socket is busy, accept a connection */
|
|
static int accept_from_sock(struct listen_connection *con)
|
|
{
|
|
int result;
|
|
struct sockaddr_storage peeraddr;
|
|
struct socket *newsock;
|
|
int len, idx;
|
|
int nodeid;
|
|
struct connection *newcon;
|
|
struct connection *addcon;
|
|
unsigned int mark;
|
|
|
|
if (!con->sock)
|
|
return -ENOTCONN;
|
|
|
|
result = kernel_accept(con->sock, &newsock, O_NONBLOCK);
|
|
if (result < 0)
|
|
goto accept_err;
|
|
|
|
/* Get the connected socket's peer */
|
|
memset(&peeraddr, 0, sizeof(peeraddr));
|
|
len = newsock->ops->getname(newsock, (struct sockaddr *)&peeraddr, 2);
|
|
if (len < 0) {
|
|
result = -ECONNABORTED;
|
|
goto accept_err;
|
|
}
|
|
|
|
/* Get the new node's NODEID */
|
|
make_sockaddr(&peeraddr, 0, &len);
|
|
if (addr_to_nodeid(&peeraddr, &nodeid, &mark)) {
|
|
switch (peeraddr.ss_family) {
|
|
case AF_INET: {
|
|
struct sockaddr_in *sin = (struct sockaddr_in *)&peeraddr;
|
|
|
|
log_print("connect from non cluster IPv4 node %pI4",
|
|
&sin->sin_addr);
|
|
break;
|
|
}
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
case AF_INET6: {
|
|
struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&peeraddr;
|
|
|
|
log_print("connect from non cluster IPv6 node %pI6c",
|
|
&sin6->sin6_addr);
|
|
break;
|
|
}
|
|
#endif
|
|
default:
|
|
log_print("invalid family from non cluster node");
|
|
break;
|
|
}
|
|
|
|
sock_release(newsock);
|
|
return -1;
|
|
}
|
|
|
|
log_print("got connection from %d", nodeid);
|
|
|
|
/* Check to see if we already have a connection to this node. This
|
|
* could happen if the two nodes initiate a connection at roughly
|
|
* the same time and the connections cross on the wire.
|
|
* In this case we store the incoming one in "othercon"
|
|
*/
|
|
idx = srcu_read_lock(&connections_srcu);
|
|
newcon = nodeid2con(nodeid, GFP_NOFS);
|
|
if (!newcon) {
|
|
srcu_read_unlock(&connections_srcu, idx);
|
|
result = -ENOMEM;
|
|
goto accept_err;
|
|
}
|
|
|
|
sock_set_mark(newsock->sk, mark);
|
|
|
|
mutex_lock(&newcon->sock_mutex);
|
|
if (newcon->sock) {
|
|
struct connection *othercon = newcon->othercon;
|
|
|
|
if (!othercon) {
|
|
othercon = kzalloc(sizeof(*othercon), GFP_NOFS);
|
|
if (!othercon) {
|
|
log_print("failed to allocate incoming socket");
|
|
mutex_unlock(&newcon->sock_mutex);
|
|
srcu_read_unlock(&connections_srcu, idx);
|
|
result = -ENOMEM;
|
|
goto accept_err;
|
|
}
|
|
|
|
result = dlm_con_init(othercon, nodeid);
|
|
if (result < 0) {
|
|
kfree(othercon);
|
|
mutex_unlock(&newcon->sock_mutex);
|
|
srcu_read_unlock(&connections_srcu, idx);
|
|
goto accept_err;
|
|
}
|
|
|
|
lockdep_set_subclass(&othercon->sock_mutex, 1);
|
|
set_bit(CF_IS_OTHERCON, &othercon->flags);
|
|
newcon->othercon = othercon;
|
|
othercon->sendcon = newcon;
|
|
} else {
|
|
/* close other sock con if we have something new */
|
|
close_connection(othercon, false, true, false);
|
|
}
|
|
|
|
mutex_lock(&othercon->sock_mutex);
|
|
add_sock(newsock, othercon);
|
|
addcon = othercon;
|
|
mutex_unlock(&othercon->sock_mutex);
|
|
}
|
|
else {
|
|
/* accept copies the sk after we've saved the callbacks, so we
|
|
don't want to save them a second time or comm errors will
|
|
result in calling sk_error_report recursively. */
|
|
add_sock(newsock, newcon);
|
|
addcon = newcon;
|
|
}
|
|
|
|
set_bit(CF_CONNECTED, &addcon->flags);
|
|
mutex_unlock(&newcon->sock_mutex);
|
|
|
|
/*
|
|
* Add it to the active queue in case we got data
|
|
* between processing the accept adding the socket
|
|
* to the read_sockets list
|
|
*/
|
|
if (!test_and_set_bit(CF_READ_PENDING, &addcon->flags))
|
|
queue_work(recv_workqueue, &addcon->rwork);
|
|
|
|
srcu_read_unlock(&connections_srcu, idx);
|
|
|
|
return 0;
|
|
|
|
accept_err:
|
|
if (newsock)
|
|
sock_release(newsock);
|
|
|
|
if (result != -EAGAIN)
|
|
log_print("error accepting connection from node: %d", result);
|
|
return result;
|
|
}
|
|
|
|
/*
|
|
* writequeue_entry_complete - try to delete and free write queue entry
|
|
* @e: write queue entry to try to delete
|
|
* @completed: bytes completed
|
|
*
|
|
* writequeue_lock must be held.
|
|
*/
|
|
static void writequeue_entry_complete(struct writequeue_entry *e, int completed)
|
|
{
|
|
e->offset += completed;
|
|
e->len -= completed;
|
|
/* signal that page was half way transmitted */
|
|
e->dirty = true;
|
|
|
|
if (e->len == 0 && e->users == 0)
|
|
free_entry(e);
|
|
}
|
|
|
|
/*
|
|
* sctp_bind_addrs - bind a SCTP socket to all our addresses
|
|
*/
|
|
static int sctp_bind_addrs(struct socket *sock, uint16_t port)
|
|
{
|
|
struct sockaddr_storage localaddr;
|
|
struct sockaddr *addr = (struct sockaddr *)&localaddr;
|
|
int i, addr_len, result = 0;
|
|
|
|
for (i = 0; i < dlm_local_count; i++) {
|
|
memcpy(&localaddr, dlm_local_addr[i], sizeof(localaddr));
|
|
make_sockaddr(&localaddr, port, &addr_len);
|
|
|
|
if (!i)
|
|
result = kernel_bind(sock, addr, addr_len);
|
|
else
|
|
result = sock_bind_add(sock->sk, addr, addr_len);
|
|
|
|
if (result < 0) {
|
|
log_print("Can't bind to %d addr number %d, %d.\n",
|
|
port, i + 1, result);
|
|
break;
|
|
}
|
|
}
|
|
return result;
|
|
}
|
|
|
|
/* Get local addresses */
|
|
static void init_local(void)
|
|
{
|
|
struct sockaddr_storage sas, *addr;
|
|
int i;
|
|
|
|
dlm_local_count = 0;
|
|
for (i = 0; i < DLM_MAX_ADDR_COUNT; i++) {
|
|
if (dlm_our_addr(&sas, i))
|
|
break;
|
|
|
|
addr = kmemdup(&sas, sizeof(*addr), GFP_NOFS);
|
|
if (!addr)
|
|
break;
|
|
dlm_local_addr[dlm_local_count++] = addr;
|
|
}
|
|
}
|
|
|
|
static void deinit_local(void)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < dlm_local_count; i++)
|
|
kfree(dlm_local_addr[i]);
|
|
}
|
|
|
|
static struct writequeue_entry *new_writequeue_entry(struct connection *con)
|
|
{
|
|
struct writequeue_entry *entry;
|
|
|
|
entry = dlm_allocate_writequeue();
|
|
if (!entry)
|
|
return NULL;
|
|
|
|
entry->page = alloc_page(GFP_ATOMIC | __GFP_ZERO);
|
|
if (!entry->page) {
|
|
dlm_free_writequeue(entry);
|
|
return NULL;
|
|
}
|
|
|
|
entry->offset = 0;
|
|
entry->len = 0;
|
|
entry->end = 0;
|
|
entry->dirty = false;
|
|
entry->con = con;
|
|
entry->users = 1;
|
|
kref_init(&entry->ref);
|
|
return entry;
|
|
}
|
|
|
|
static struct writequeue_entry *new_wq_entry(struct connection *con, int len,
|
|
char **ppc, void (*cb)(void *data),
|
|
void *data)
|
|
{
|
|
struct writequeue_entry *e;
|
|
|
|
spin_lock(&con->writequeue_lock);
|
|
if (!list_empty(&con->writequeue)) {
|
|
e = list_last_entry(&con->writequeue, struct writequeue_entry, list);
|
|
if (DLM_WQ_REMAIN_BYTES(e) >= len) {
|
|
kref_get(&e->ref);
|
|
|
|
*ppc = page_address(e->page) + e->end;
|
|
if (cb)
|
|
cb(data);
|
|
|
|
e->end += len;
|
|
e->users++;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
e = new_writequeue_entry(con);
|
|
if (!e)
|
|
goto out;
|
|
|
|
kref_get(&e->ref);
|
|
*ppc = page_address(e->page);
|
|
e->end += len;
|
|
atomic_inc(&con->writequeue_cnt);
|
|
if (cb)
|
|
cb(data);
|
|
|
|
list_add_tail(&e->list, &con->writequeue);
|
|
|
|
out:
|
|
spin_unlock(&con->writequeue_lock);
|
|
return e;
|
|
};
|
|
|
|
static struct dlm_msg *dlm_lowcomms_new_msg_con(struct connection *con, int len,
|
|
gfp_t allocation, char **ppc,
|
|
void (*cb)(void *data),
|
|
void *data)
|
|
{
|
|
struct writequeue_entry *e;
|
|
struct dlm_msg *msg;
|
|
|
|
msg = dlm_allocate_msg(allocation);
|
|
if (!msg)
|
|
return NULL;
|
|
|
|
kref_init(&msg->ref);
|
|
|
|
e = new_wq_entry(con, len, ppc, cb, data);
|
|
if (!e) {
|
|
dlm_free_msg(msg);
|
|
return NULL;
|
|
}
|
|
|
|
msg->retransmit = false;
|
|
msg->orig_msg = NULL;
|
|
msg->ppc = *ppc;
|
|
msg->len = len;
|
|
msg->entry = e;
|
|
|
|
return msg;
|
|
}
|
|
|
|
/* avoid false positive for nodes_srcu, unlock happens in
|
|
* dlm_lowcomms_commit_msg which is a must call if success
|
|
*/
|
|
#ifndef __CHECKER__
|
|
struct dlm_msg *dlm_lowcomms_new_msg(int nodeid, int len, gfp_t allocation,
|
|
char **ppc, void (*cb)(void *data),
|
|
void *data)
|
|
{
|
|
struct connection *con;
|
|
struct dlm_msg *msg;
|
|
int idx;
|
|
|
|
if (len > DLM_MAX_SOCKET_BUFSIZE ||
|
|
len < sizeof(struct dlm_header)) {
|
|
BUILD_BUG_ON(PAGE_SIZE < DLM_MAX_SOCKET_BUFSIZE);
|
|
log_print("failed to allocate a buffer of size %d", len);
|
|
WARN_ON(1);
|
|
return NULL;
|
|
}
|
|
|
|
idx = srcu_read_lock(&connections_srcu);
|
|
con = nodeid2con(nodeid, allocation);
|
|
if (!con) {
|
|
srcu_read_unlock(&connections_srcu, idx);
|
|
return NULL;
|
|
}
|
|
|
|
msg = dlm_lowcomms_new_msg_con(con, len, allocation, ppc, cb, data);
|
|
if (!msg) {
|
|
srcu_read_unlock(&connections_srcu, idx);
|
|
return NULL;
|
|
}
|
|
|
|
/* we assume if successful commit must called */
|
|
msg->idx = idx;
|
|
return msg;
|
|
}
|
|
#endif
|
|
|
|
static void _dlm_lowcomms_commit_msg(struct dlm_msg *msg)
|
|
{
|
|
struct writequeue_entry *e = msg->entry;
|
|
struct connection *con = e->con;
|
|
int users;
|
|
|
|
spin_lock(&con->writequeue_lock);
|
|
kref_get(&msg->ref);
|
|
list_add(&msg->list, &e->msgs);
|
|
|
|
users = --e->users;
|
|
if (users)
|
|
goto out;
|
|
|
|
e->len = DLM_WQ_LENGTH_BYTES(e);
|
|
spin_unlock(&con->writequeue_lock);
|
|
|
|
queue_work(send_workqueue, &con->swork);
|
|
return;
|
|
|
|
out:
|
|
spin_unlock(&con->writequeue_lock);
|
|
return;
|
|
}
|
|
|
|
/* avoid false positive for nodes_srcu, lock was happen in
|
|
* dlm_lowcomms_new_msg
|
|
*/
|
|
#ifndef __CHECKER__
|
|
void dlm_lowcomms_commit_msg(struct dlm_msg *msg)
|
|
{
|
|
_dlm_lowcomms_commit_msg(msg);
|
|
srcu_read_unlock(&connections_srcu, msg->idx);
|
|
}
|
|
#endif
|
|
|
|
void dlm_lowcomms_put_msg(struct dlm_msg *msg)
|
|
{
|
|
kref_put(&msg->ref, dlm_msg_release);
|
|
}
|
|
|
|
/* does not held connections_srcu, usage workqueue only */
|
|
int dlm_lowcomms_resend_msg(struct dlm_msg *msg)
|
|
{
|
|
struct dlm_msg *msg_resend;
|
|
char *ppc;
|
|
|
|
if (msg->retransmit)
|
|
return 1;
|
|
|
|
msg_resend = dlm_lowcomms_new_msg_con(msg->entry->con, msg->len,
|
|
GFP_ATOMIC, &ppc, NULL, NULL);
|
|
if (!msg_resend)
|
|
return -ENOMEM;
|
|
|
|
msg->retransmit = true;
|
|
kref_get(&msg->ref);
|
|
msg_resend->orig_msg = msg;
|
|
|
|
memcpy(ppc, msg->ppc, msg->len);
|
|
_dlm_lowcomms_commit_msg(msg_resend);
|
|
dlm_lowcomms_put_msg(msg_resend);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Send a message */
|
|
static void send_to_sock(struct connection *con)
|
|
{
|
|
const int msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL;
|
|
struct writequeue_entry *e;
|
|
int len, offset, ret;
|
|
int count = 0;
|
|
|
|
mutex_lock(&con->sock_mutex);
|
|
if (con->sock == NULL)
|
|
goto out_connect;
|
|
|
|
spin_lock(&con->writequeue_lock);
|
|
for (;;) {
|
|
e = con_next_wq(con);
|
|
if (!e)
|
|
break;
|
|
|
|
len = e->len;
|
|
offset = e->offset;
|
|
BUG_ON(len == 0 && e->users == 0);
|
|
spin_unlock(&con->writequeue_lock);
|
|
|
|
ret = kernel_sendpage(con->sock, e->page, offset, len,
|
|
msg_flags);
|
|
trace_dlm_send(con->nodeid, ret);
|
|
if (ret == -EAGAIN || ret == 0) {
|
|
if (ret == -EAGAIN &&
|
|
test_bit(SOCKWQ_ASYNC_NOSPACE, &con->sock->flags) &&
|
|
!test_and_set_bit(CF_APP_LIMITED, &con->flags)) {
|
|
/* Notify TCP that we're limited by the
|
|
* application window size.
|
|
*/
|
|
set_bit(SOCK_NOSPACE, &con->sock->flags);
|
|
con->sock->sk->sk_write_pending++;
|
|
}
|
|
cond_resched();
|
|
goto out;
|
|
} else if (ret < 0)
|
|
goto out;
|
|
|
|
/* Don't starve people filling buffers */
|
|
if (++count >= MAX_SEND_MSG_COUNT) {
|
|
cond_resched();
|
|
count = 0;
|
|
}
|
|
|
|
spin_lock(&con->writequeue_lock);
|
|
writequeue_entry_complete(e, ret);
|
|
}
|
|
spin_unlock(&con->writequeue_lock);
|
|
|
|
/* close if we got EOF */
|
|
if (test_and_clear_bit(CF_EOF, &con->flags)) {
|
|
mutex_unlock(&con->sock_mutex);
|
|
close_connection(con, false, false, true);
|
|
|
|
/* handling for tcp shutdown */
|
|
clear_bit(CF_SHUTDOWN, &con->flags);
|
|
wake_up(&con->shutdown_wait);
|
|
} else {
|
|
mutex_unlock(&con->sock_mutex);
|
|
}
|
|
|
|
return;
|
|
|
|
out:
|
|
mutex_unlock(&con->sock_mutex);
|
|
return;
|
|
|
|
out_connect:
|
|
mutex_unlock(&con->sock_mutex);
|
|
queue_work(send_workqueue, &con->swork);
|
|
cond_resched();
|
|
}
|
|
|
|
static void clean_one_writequeue(struct connection *con)
|
|
{
|
|
struct writequeue_entry *e, *safe;
|
|
|
|
spin_lock(&con->writequeue_lock);
|
|
list_for_each_entry_safe(e, safe, &con->writequeue, list) {
|
|
free_entry(e);
|
|
}
|
|
spin_unlock(&con->writequeue_lock);
|
|
}
|
|
|
|
/* Called from recovery when it knows that a node has
|
|
left the cluster */
|
|
int dlm_lowcomms_close(int nodeid)
|
|
{
|
|
struct connection *con;
|
|
struct dlm_node_addr *na;
|
|
int idx;
|
|
|
|
log_print("closing connection to node %d", nodeid);
|
|
idx = srcu_read_lock(&connections_srcu);
|
|
con = nodeid2con(nodeid, 0);
|
|
if (con) {
|
|
set_bit(CF_CLOSE, &con->flags);
|
|
close_connection(con, true, true, true);
|
|
clean_one_writequeue(con);
|
|
if (con->othercon)
|
|
clean_one_writequeue(con->othercon);
|
|
}
|
|
srcu_read_unlock(&connections_srcu, idx);
|
|
|
|
spin_lock(&dlm_node_addrs_spin);
|
|
na = find_node_addr(nodeid);
|
|
if (na) {
|
|
list_del(&na->list);
|
|
while (na->addr_count--)
|
|
kfree(na->addr[na->addr_count]);
|
|
kfree(na);
|
|
}
|
|
spin_unlock(&dlm_node_addrs_spin);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Receive workqueue function */
|
|
static void process_recv_sockets(struct work_struct *work)
|
|
{
|
|
struct connection *con = container_of(work, struct connection, rwork);
|
|
|
|
clear_bit(CF_READ_PENDING, &con->flags);
|
|
receive_from_sock(con);
|
|
}
|
|
|
|
static void process_listen_recv_socket(struct work_struct *work)
|
|
{
|
|
accept_from_sock(&listen_con);
|
|
}
|
|
|
|
static void dlm_connect(struct connection *con)
|
|
{
|
|
struct sockaddr_storage addr;
|
|
int result, addr_len;
|
|
struct socket *sock;
|
|
unsigned int mark;
|
|
|
|
/* Some odd races can cause double-connects, ignore them */
|
|
if (con->retries++ > MAX_CONNECT_RETRIES)
|
|
return;
|
|
|
|
if (con->sock) {
|
|
log_print("node %d already connected.", con->nodeid);
|
|
return;
|
|
}
|
|
|
|
memset(&addr, 0, sizeof(addr));
|
|
result = nodeid_to_addr(con->nodeid, &addr, NULL,
|
|
dlm_proto_ops->try_new_addr, &mark);
|
|
if (result < 0) {
|
|
log_print("no address for nodeid %d", con->nodeid);
|
|
return;
|
|
}
|
|
|
|
/* Create a socket to communicate with */
|
|
result = sock_create_kern(&init_net, dlm_local_addr[0]->ss_family,
|
|
SOCK_STREAM, dlm_proto_ops->proto, &sock);
|
|
if (result < 0)
|
|
goto socket_err;
|
|
|
|
sock_set_mark(sock->sk, mark);
|
|
dlm_proto_ops->sockopts(sock);
|
|
|
|
add_sock(sock, con);
|
|
|
|
result = dlm_proto_ops->bind(sock);
|
|
if (result < 0)
|
|
goto add_sock_err;
|
|
|
|
log_print_ratelimited("connecting to %d", con->nodeid);
|
|
make_sockaddr(&addr, dlm_config.ci_tcp_port, &addr_len);
|
|
result = dlm_proto_ops->connect(con, sock, (struct sockaddr *)&addr,
|
|
addr_len);
|
|
if (result < 0)
|
|
goto add_sock_err;
|
|
|
|
return;
|
|
|
|
add_sock_err:
|
|
dlm_close_sock(&con->sock);
|
|
|
|
socket_err:
|
|
/*
|
|
* Some errors are fatal and this list might need adjusting. For other
|
|
* errors we try again until the max number of retries is reached.
|
|
*/
|
|
if (result != -EHOSTUNREACH &&
|
|
result != -ENETUNREACH &&
|
|
result != -ENETDOWN &&
|
|
result != -EINVAL &&
|
|
result != -EPROTONOSUPPORT) {
|
|
log_print("connect %d try %d error %d", con->nodeid,
|
|
con->retries, result);
|
|
msleep(1000);
|
|
lowcomms_connect_sock(con);
|
|
}
|
|
}
|
|
|
|
/* Send workqueue function */
|
|
static void process_send_sockets(struct work_struct *work)
|
|
{
|
|
struct connection *con = container_of(work, struct connection, swork);
|
|
|
|
WARN_ON(test_bit(CF_IS_OTHERCON, &con->flags));
|
|
|
|
clear_bit(CF_WRITE_PENDING, &con->flags);
|
|
|
|
if (test_and_clear_bit(CF_RECONNECT, &con->flags)) {
|
|
close_connection(con, false, false, true);
|
|
dlm_midcomms_unack_msg_resend(con->nodeid);
|
|
}
|
|
|
|
if (con->sock == NULL) {
|
|
if (test_and_clear_bit(CF_DELAY_CONNECT, &con->flags))
|
|
msleep(1000);
|
|
|
|
mutex_lock(&con->sock_mutex);
|
|
dlm_connect(con);
|
|
mutex_unlock(&con->sock_mutex);
|
|
}
|
|
|
|
if (!list_empty(&con->writequeue))
|
|
send_to_sock(con);
|
|
}
|
|
|
|
static void work_stop(void)
|
|
{
|
|
if (recv_workqueue) {
|
|
destroy_workqueue(recv_workqueue);
|
|
recv_workqueue = NULL;
|
|
}
|
|
|
|
if (send_workqueue) {
|
|
destroy_workqueue(send_workqueue);
|
|
send_workqueue = NULL;
|
|
}
|
|
}
|
|
|
|
static int work_start(void)
|
|
{
|
|
recv_workqueue = alloc_ordered_workqueue("dlm_recv", WQ_MEM_RECLAIM);
|
|
if (!recv_workqueue) {
|
|
log_print("can't start dlm_recv");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
send_workqueue = alloc_ordered_workqueue("dlm_send", WQ_MEM_RECLAIM);
|
|
if (!send_workqueue) {
|
|
log_print("can't start dlm_send");
|
|
destroy_workqueue(recv_workqueue);
|
|
recv_workqueue = NULL;
|
|
return -ENOMEM;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void shutdown_conn(struct connection *con)
|
|
{
|
|
if (dlm_proto_ops->shutdown_action)
|
|
dlm_proto_ops->shutdown_action(con);
|
|
}
|
|
|
|
void dlm_lowcomms_shutdown(void)
|
|
{
|
|
int idx;
|
|
|
|
/* Set all the flags to prevent any
|
|
* socket activity.
|
|
*/
|
|
dlm_allow_conn = 0;
|
|
|
|
if (recv_workqueue)
|
|
flush_workqueue(recv_workqueue);
|
|
if (send_workqueue)
|
|
flush_workqueue(send_workqueue);
|
|
|
|
dlm_close_sock(&listen_con.sock);
|
|
|
|
idx = srcu_read_lock(&connections_srcu);
|
|
foreach_conn(shutdown_conn);
|
|
srcu_read_unlock(&connections_srcu, idx);
|
|
}
|
|
|
|
static void _stop_conn(struct connection *con, bool and_other)
|
|
{
|
|
mutex_lock(&con->sock_mutex);
|
|
set_bit(CF_CLOSE, &con->flags);
|
|
set_bit(CF_READ_PENDING, &con->flags);
|
|
set_bit(CF_WRITE_PENDING, &con->flags);
|
|
if (con->sock && con->sock->sk) {
|
|
lock_sock(con->sock->sk);
|
|
con->sock->sk->sk_user_data = NULL;
|
|
release_sock(con->sock->sk);
|
|
}
|
|
if (con->othercon && and_other)
|
|
_stop_conn(con->othercon, false);
|
|
mutex_unlock(&con->sock_mutex);
|
|
}
|
|
|
|
static void stop_conn(struct connection *con)
|
|
{
|
|
_stop_conn(con, true);
|
|
}
|
|
|
|
static void connection_release(struct rcu_head *rcu)
|
|
{
|
|
struct connection *con = container_of(rcu, struct connection, rcu);
|
|
|
|
kfree(con->rx_buf);
|
|
kfree(con);
|
|
}
|
|
|
|
static void free_conn(struct connection *con)
|
|
{
|
|
close_connection(con, true, true, true);
|
|
spin_lock(&connections_lock);
|
|
hlist_del_rcu(&con->list);
|
|
spin_unlock(&connections_lock);
|
|
if (con->othercon) {
|
|
clean_one_writequeue(con->othercon);
|
|
call_srcu(&connections_srcu, &con->othercon->rcu,
|
|
connection_release);
|
|
}
|
|
clean_one_writequeue(con);
|
|
call_srcu(&connections_srcu, &con->rcu, connection_release);
|
|
}
|
|
|
|
static void work_flush(void)
|
|
{
|
|
int ok;
|
|
int i;
|
|
struct connection *con;
|
|
|
|
do {
|
|
ok = 1;
|
|
foreach_conn(stop_conn);
|
|
if (recv_workqueue)
|
|
flush_workqueue(recv_workqueue);
|
|
if (send_workqueue)
|
|
flush_workqueue(send_workqueue);
|
|
for (i = 0; i < CONN_HASH_SIZE && ok; i++) {
|
|
hlist_for_each_entry_rcu(con, &connection_hash[i],
|
|
list) {
|
|
ok &= test_bit(CF_READ_PENDING, &con->flags);
|
|
ok &= test_bit(CF_WRITE_PENDING, &con->flags);
|
|
if (con->othercon) {
|
|
ok &= test_bit(CF_READ_PENDING,
|
|
&con->othercon->flags);
|
|
ok &= test_bit(CF_WRITE_PENDING,
|
|
&con->othercon->flags);
|
|
}
|
|
}
|
|
}
|
|
} while (!ok);
|
|
}
|
|
|
|
void dlm_lowcomms_stop(void)
|
|
{
|
|
int idx;
|
|
|
|
idx = srcu_read_lock(&connections_srcu);
|
|
work_flush();
|
|
foreach_conn(free_conn);
|
|
srcu_read_unlock(&connections_srcu, idx);
|
|
work_stop();
|
|
deinit_local();
|
|
|
|
dlm_proto_ops = NULL;
|
|
}
|
|
|
|
static int dlm_listen_for_all(void)
|
|
{
|
|
struct socket *sock;
|
|
int result;
|
|
|
|
log_print("Using %s for communications",
|
|
dlm_proto_ops->name);
|
|
|
|
result = dlm_proto_ops->listen_validate();
|
|
if (result < 0)
|
|
return result;
|
|
|
|
result = sock_create_kern(&init_net, dlm_local_addr[0]->ss_family,
|
|
SOCK_STREAM, dlm_proto_ops->proto, &sock);
|
|
if (result < 0) {
|
|
log_print("Can't create comms socket: %d", result);
|
|
return result;
|
|
}
|
|
|
|
sock_set_mark(sock->sk, dlm_config.ci_mark);
|
|
dlm_proto_ops->listen_sockopts(sock);
|
|
|
|
result = dlm_proto_ops->listen_bind(sock);
|
|
if (result < 0)
|
|
goto out;
|
|
|
|
save_listen_callbacks(sock);
|
|
add_listen_sock(sock, &listen_con);
|
|
|
|
INIT_WORK(&listen_con.rwork, process_listen_recv_socket);
|
|
result = sock->ops->listen(sock, 5);
|
|
if (result < 0) {
|
|
dlm_close_sock(&listen_con.sock);
|
|
goto out;
|
|
}
|
|
|
|
return 0;
|
|
|
|
out:
|
|
sock_release(sock);
|
|
return result;
|
|
}
|
|
|
|
static int dlm_tcp_bind(struct socket *sock)
|
|
{
|
|
struct sockaddr_storage src_addr;
|
|
int result, addr_len;
|
|
|
|
/* Bind to our cluster-known address connecting to avoid
|
|
* routing problems.
|
|
*/
|
|
memcpy(&src_addr, dlm_local_addr[0], sizeof(src_addr));
|
|
make_sockaddr(&src_addr, 0, &addr_len);
|
|
|
|
result = sock->ops->bind(sock, (struct sockaddr *)&src_addr,
|
|
addr_len);
|
|
if (result < 0) {
|
|
/* This *may* not indicate a critical error */
|
|
log_print("could not bind for connect: %d", result);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int dlm_tcp_connect(struct connection *con, struct socket *sock,
|
|
struct sockaddr *addr, int addr_len)
|
|
{
|
|
int ret;
|
|
|
|
ret = sock->ops->connect(sock, addr, addr_len, O_NONBLOCK);
|
|
switch (ret) {
|
|
case -EINPROGRESS:
|
|
fallthrough;
|
|
case 0:
|
|
return 0;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int dlm_tcp_listen_validate(void)
|
|
{
|
|
/* We don't support multi-homed hosts */
|
|
if (dlm_local_count > 1) {
|
|
log_print("TCP protocol can't handle multi-homed hosts, try SCTP");
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void dlm_tcp_sockopts(struct socket *sock)
|
|
{
|
|
/* Turn off Nagle's algorithm */
|
|
tcp_sock_set_nodelay(sock->sk);
|
|
}
|
|
|
|
static void dlm_tcp_listen_sockopts(struct socket *sock)
|
|
{
|
|
dlm_tcp_sockopts(sock);
|
|
sock_set_reuseaddr(sock->sk);
|
|
}
|
|
|
|
static int dlm_tcp_listen_bind(struct socket *sock)
|
|
{
|
|
int addr_len;
|
|
|
|
/* Bind to our port */
|
|
make_sockaddr(dlm_local_addr[0], dlm_config.ci_tcp_port, &addr_len);
|
|
return sock->ops->bind(sock, (struct sockaddr *)dlm_local_addr[0],
|
|
addr_len);
|
|
}
|
|
|
|
static const struct dlm_proto_ops dlm_tcp_ops = {
|
|
.name = "TCP",
|
|
.proto = IPPROTO_TCP,
|
|
.connect = dlm_tcp_connect,
|
|
.sockopts = dlm_tcp_sockopts,
|
|
.bind = dlm_tcp_bind,
|
|
.listen_validate = dlm_tcp_listen_validate,
|
|
.listen_sockopts = dlm_tcp_listen_sockopts,
|
|
.listen_bind = dlm_tcp_listen_bind,
|
|
.shutdown_action = dlm_tcp_shutdown,
|
|
.eof_condition = tcp_eof_condition,
|
|
};
|
|
|
|
static int dlm_sctp_bind(struct socket *sock)
|
|
{
|
|
return sctp_bind_addrs(sock, 0);
|
|
}
|
|
|
|
static int dlm_sctp_connect(struct connection *con, struct socket *sock,
|
|
struct sockaddr *addr, int addr_len)
|
|
{
|
|
int ret;
|
|
|
|
/*
|
|
* Make sock->ops->connect() function return in specified time,
|
|
* since O_NONBLOCK argument in connect() function does not work here,
|
|
* then, we should restore the default value of this attribute.
|
|
*/
|
|
sock_set_sndtimeo(sock->sk, 5);
|
|
ret = sock->ops->connect(sock, addr, addr_len, 0);
|
|
sock_set_sndtimeo(sock->sk, 0);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
if (!test_and_set_bit(CF_CONNECTED, &con->flags))
|
|
log_print("connected to node %d", con->nodeid);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int dlm_sctp_listen_validate(void)
|
|
{
|
|
if (!IS_ENABLED(CONFIG_IP_SCTP)) {
|
|
log_print("SCTP is not enabled by this kernel");
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
request_module("sctp");
|
|
return 0;
|
|
}
|
|
|
|
static int dlm_sctp_bind_listen(struct socket *sock)
|
|
{
|
|
return sctp_bind_addrs(sock, dlm_config.ci_tcp_port);
|
|
}
|
|
|
|
static void dlm_sctp_sockopts(struct socket *sock)
|
|
{
|
|
/* Turn off Nagle's algorithm */
|
|
sctp_sock_set_nodelay(sock->sk);
|
|
sock_set_rcvbuf(sock->sk, NEEDED_RMEM);
|
|
}
|
|
|
|
static const struct dlm_proto_ops dlm_sctp_ops = {
|
|
.name = "SCTP",
|
|
.proto = IPPROTO_SCTP,
|
|
.try_new_addr = true,
|
|
.connect = dlm_sctp_connect,
|
|
.sockopts = dlm_sctp_sockopts,
|
|
.bind = dlm_sctp_bind,
|
|
.listen_validate = dlm_sctp_listen_validate,
|
|
.listen_sockopts = dlm_sctp_sockopts,
|
|
.listen_bind = dlm_sctp_bind_listen,
|
|
};
|
|
|
|
int dlm_lowcomms_start(void)
|
|
{
|
|
int error = -EINVAL;
|
|
int i;
|
|
|
|
for (i = 0; i < CONN_HASH_SIZE; i++)
|
|
INIT_HLIST_HEAD(&connection_hash[i]);
|
|
|
|
init_local();
|
|
if (!dlm_local_count) {
|
|
error = -ENOTCONN;
|
|
log_print("no local IP address has been set");
|
|
goto fail;
|
|
}
|
|
|
|
INIT_WORK(&listen_con.rwork, process_listen_recv_socket);
|
|
|
|
error = work_start();
|
|
if (error)
|
|
goto fail_local;
|
|
|
|
dlm_allow_conn = 1;
|
|
|
|
/* Start listening */
|
|
switch (dlm_config.ci_protocol) {
|
|
case DLM_PROTO_TCP:
|
|
dlm_proto_ops = &dlm_tcp_ops;
|
|
break;
|
|
case DLM_PROTO_SCTP:
|
|
dlm_proto_ops = &dlm_sctp_ops;
|
|
break;
|
|
default:
|
|
log_print("Invalid protocol identifier %d set",
|
|
dlm_config.ci_protocol);
|
|
error = -EINVAL;
|
|
goto fail_proto_ops;
|
|
}
|
|
|
|
error = dlm_listen_for_all();
|
|
if (error)
|
|
goto fail_listen;
|
|
|
|
return 0;
|
|
|
|
fail_listen:
|
|
dlm_proto_ops = NULL;
|
|
fail_proto_ops:
|
|
dlm_allow_conn = 0;
|
|
dlm_close_sock(&listen_con.sock);
|
|
work_stop();
|
|
fail_local:
|
|
deinit_local();
|
|
fail:
|
|
return error;
|
|
}
|
|
|
|
void dlm_lowcomms_exit(void)
|
|
{
|
|
struct dlm_node_addr *na, *safe;
|
|
|
|
spin_lock(&dlm_node_addrs_spin);
|
|
list_for_each_entry_safe(na, safe, &dlm_node_addrs, list) {
|
|
list_del(&na->list);
|
|
while (na->addr_count--)
|
|
kfree(na->addr[na->addr_count]);
|
|
kfree(na);
|
|
}
|
|
spin_unlock(&dlm_node_addrs_spin);
|
|
}
|