#include "config.h"
struct cbuf {
- unsigned base;
- unsigned len;
- unsigned mask;
+ unsigned int base;
+ unsigned int len;
+ unsigned int mask;
};
-#ifndef FALSE
-#define FALSE 0
-#define TRUE 1
-#endif
#define NODE_INCREMENT 32
+static void cbuf_add(struct cbuf *cb, int n)
+{
+ cb->len += n;
+}
-#define CBUF_INIT(cb, size) do { (cb)->base = (cb)->len = 0; (cb)->mask = ((size)-1); } while(0)
-#define CBUF_ADD(cb, n) do { (cb)->len += n; } while(0)
-#define CBUF_EMPTY(cb) ((cb)->len == 0)
-#define CBUF_MAY_ADD(cb, n) (((cb)->len + (n)) < ((cb)->mask + 1))
-#define CBUF_EAT(cb, n) do { (cb)->len -= (n); \
- (cb)->base += (n); (cb)->base &= (cb)->mask; } while(0)
-#define CBUF_DATA(cb) (((cb)->base + (cb)->len) & (cb)->mask)
+static int cbuf_data(struct cbuf *cb)
+{
+ return ((cb->base + cb->len) & cb->mask);
+}
+
+static void cbuf_init(struct cbuf *cb, int size)
+{
+ cb->base = cb->len = 0;
+ cb->mask = size-1;
+}
+
+static void cbuf_eat(struct cbuf *cb, int n)
+{
+ cb->len -= n;
+ cb->base += n;
+ cb->base &= cb->mask;
+}
+
+static bool cbuf_empty(struct cbuf *cb)
+{
+ return cb->len == 0;
+}
/* Maximum number of incoming messages to process before
- doing a schedule()
+ doing a cond_resched()
*/
#define MAX_RX_MSG_COUNT 25
struct connection {
struct socket *sock; /* NULL if not connected */
uint32_t nodeid; /* So we know who we are in the list */
- struct rw_semaphore sock_sem; /* Stop connect races */
- struct list_head read_list; /* On this list when ready for reading */
- struct list_head write_list; /* On this list when ready for writing */
- struct list_head state_list; /* On this list when ready to connect */
+ struct rw_semaphore sock_sem; /* Stop connect races */
+ struct list_head read_list; /* On this list when ready for reading */
+ struct list_head write_list; /* On this list when ready for writing */
+ struct list_head state_list; /* On this list when ready to connect */
unsigned long flags; /* bit 1,2 = We are on the read/write lists */
#define CF_READ_PENDING 1
#define CF_WRITE_PENDING 2
#define CF_CONNECT_PENDING 3
#define CF_IS_OTHERCON 4
- struct list_head writequeue; /* List of outgoing writequeue_entries */
- struct list_head listenlist; /* List of allocated listening sockets */
+ struct list_head writequeue; /* List of outgoing writequeue_entries */
+ struct list_head listenlist; /* List of allocated listening sockets */
spinlock_t writequeue_lock;
int (*rx_action) (struct connection *); /* What to do when active */
struct page *rx_page;
static struct task_struct *send_task;
static wait_queue_t lowcomms_send_waitq_head;
-static wait_queue_head_t lowcomms_send_waitq;
+static DECLARE_WAIT_QUEUE_HEAD(lowcomms_send_waitq);
static wait_queue_t lowcomms_recv_waitq_head;
-static wait_queue_head_t lowcomms_recv_waitq;
+static DECLARE_WAIT_QUEUE_HEAD(lowcomms_recv_waitq);
/* An array of pointers to connections, indexed by NODEID */
static struct connection **connections;
-static struct semaphore connections_lock;
+static DECLARE_MUTEX(connections_lock);
static kmem_cache_t *con_cache;
static int conn_array_size;
-static atomic_t accepting;
/* List of sockets that have reads pending */
-static struct list_head read_sockets;
-static spinlock_t read_sockets_lock;
+static LIST_HEAD(read_sockets);
+static DEFINE_SPINLOCK(read_sockets_lock);
/* List of sockets which have writes pending */
-static struct list_head write_sockets;
-static spinlock_t write_sockets_lock;
+static LIST_HEAD(write_sockets);
+static DEFINE_SPINLOCK(write_sockets_lock);
/* List of sockets which have connects pending */
-static struct list_head state_sockets;
-static spinlock_t state_sockets_lock;
+static LIST_HEAD(state_sockets);
+static DEFINE_SPINLOCK(state_sockets_lock);
static struct connection *nodeid2con(int nodeid, gfp_t allocation)
{
int new_size = nodeid + NODE_INCREMENT;
struct connection **new_conns;
- new_conns = kmalloc(sizeof(struct connection *) *
+ new_conns = kzalloc(sizeof(struct connection *) *
new_size, allocation);
if (!new_conns)
goto finish;
- memset(new_conns, 0, sizeof(struct connection *) * new_size);
memcpy(new_conns, connections, sizeof(struct connection *) * conn_array_size);
conn_array_size = new_size;
kfree(connections);
con = connections[nodeid];
if (con == NULL && allocation) {
- con = kmem_cache_alloc(con_cache, allocation);
+ con = kmem_cache_zalloc(con_cache, allocation);
if (!con)
goto finish;
- memset(con, 0, sizeof(*con));
con->nodeid = nodeid;
init_rwsem(&con->sock_sem);
INIT_LIST_HEAD(&con->writequeue);
connections[nodeid] = con;
}
- finish:
+finish:
up(&connections_lock);
return con;
}
{
if (test_and_set_bit(CF_CONNECT_PENDING, &con->flags))
return;
- if (!atomic_read(&accepting))
- return;
spin_lock_bh(&state_sockets_lock);
list_add_tail(&con->state_list, &state_sockets);
static void lowcomms_state_change(struct sock *sk)
{
-/* struct connection *con = sock2con(sk); */
-
- switch (sk->sk_state) {
- case TCP_ESTABLISHED:
+ if (sk->sk_state == TCP_ESTABLISHED)
lowcomms_write_space(sk);
- break;
-
- case TCP_FIN_WAIT1:
- case TCP_FIN_WAIT2:
- case TCP_TIME_WAIT:
- case TCP_CLOSE:
- case TCP_CLOSE_WAIT:
- case TCP_LAST_ACK:
- case TCP_CLOSING:
- /* FIXME: I think this causes more trouble than it solves.
- lowcomms wil reconnect anyway when there is something to
- send. This just attempts reconnection if a node goes down!
- */
- /* lowcomms_connect_sock(con); */
- break;
-
- default:
- printk("dlm: lowcomms_state_change: state=%d\n", sk->sk_state);
- break;
- }
}
/* Make a socket active */
static void make_sockaddr(struct sockaddr_storage *saddr, uint16_t port,
int *addr_len)
{
- saddr->ss_family = dlm_local_addr.ss_family;
- if (saddr->ss_family == AF_INET) {
+ saddr->ss_family = dlm_local_addr.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);
- }
- else {
+ } else {
struct sockaddr_in6 *in6_addr = (struct sockaddr_in6 *)saddr;
in6_addr->sin6_port = cpu_to_be16(port);
*addr_len = sizeof(struct sockaddr_in6);
}
/* Close a remote connection and tidy up */
-static void close_connection(struct connection *con, int and_other)
+static void close_connection(struct connection *con, bool and_other)
{
down_write(&con->sock_sem);
con->sock = NULL;
}
if (con->othercon && and_other) {
- /* Argh! recursion in kernel code!
- Actually, this isn't a list so it
- will only re-enter once.
- */
- close_connection(con->othercon, FALSE);
+ /* Will only re-enter once. */
+ close_connection(con->othercon, false);
}
if (con->rx_page) {
__free_page(con->rx_page);
con->rx_page = alloc_page(GFP_ATOMIC);
if (con->rx_page == NULL)
goto out_resched;
- CBUF_INIT(&con->cb, PAGE_CACHE_SIZE);
+ cbuf_init(&con->cb, PAGE_CACHE_SIZE);
}
msg.msg_control = NULL;
* iov[0] is the bit of the circular buffer between the current end
* point (cb.base + cb.len) and the end of the buffer.
*/
- iov[0].iov_len = con->cb.base - CBUF_DATA(&con->cb);
- iov[0].iov_base = page_address(con->rx_page) + CBUF_DATA(&con->cb);
+ iov[0].iov_len = con->cb.base - cbuf_data(&con->cb);
+ iov[0].iov_base = page_address(con->rx_page) + cbuf_data(&con->cb);
iov[1].iov_len = 0;
/*
* iov[1] is the bit of the circular buffer between the start of the
* buffer and the start of the currently used section (cb.base)
*/
- if (CBUF_DATA(&con->cb) >= con->cb.base) {
- iov[0].iov_len = PAGE_CACHE_SIZE - CBUF_DATA(&con->cb);
+ if (cbuf_data(&con->cb) >= con->cb.base) {
+ iov[0].iov_len = PAGE_CACHE_SIZE - cbuf_data(&con->cb);
iov[1].iov_len = con->cb.base;
iov[1].iov_base = page_address(con->rx_page);
msg.msg_iovlen = 2;
goto out_close;
if (ret == len)
call_again_soon = 1;
- CBUF_ADD(&con->cb, ret);
+ cbuf_add(&con->cb, ret);
ret = dlm_process_incoming_buffer(con->nodeid,
page_address(con->rx_page),
con->cb.base, con->cb.len,
}
if (ret < 0)
goto out_close;
- CBUF_EAT(&con->cb, ret);
+ cbuf_eat(&con->cb, ret);
- if (CBUF_EMPTY(&con->cb) && !call_again_soon) {
+ if (cbuf_empty(&con->cb) && !call_again_soon) {
__free_page(con->rx_page);
con->rx_page = NULL;
}
- out:
+out:
if (call_again_soon)
goto out_resched;
up_read(&con->sock_sem);
- ret = 0;
- goto out_ret;
+ return 0;
- out_resched:
+out_resched:
lowcomms_data_ready(con->sock->sk, 0);
up_read(&con->sock_sem);
- ret = 0;
- schedule();
- goto out_ret;
+ cond_resched();
+ return 0;
- out_close:
+out_close:
up_read(&con->sock_sem);
if (ret != -EAGAIN && !test_bit(CF_IS_OTHERCON, &con->flags)) {
- close_connection(con, FALSE);
+ close_connection(con, false);
/* Reconnect when there is something to send */
}
- out_ret:
return ret;
}
struct connection *newcon;
memset(&peeraddr, 0, sizeof(peeraddr));
- result = sock_create_kern(dlm_local_addr.ss_family, SOCK_STREAM, IPPROTO_TCP, &newsock);
+ result = sock_create_kern(dlm_local_addr.ss_family, SOCK_STREAM,
+ IPPROTO_TCP, &newsock);
if (result < 0)
return -ENOMEM;
/* Get the new node's NODEID */
make_sockaddr(&peeraddr, 0, &len);
if (dlm_addr_to_nodeid(&peeraddr, &nodeid)) {
- printk("dlm: connect from non cluster node\n");
+ printk("dlm: connect from non cluster node\n");
sock_release(newsock);
up_read(&con->sock_sem);
return -1;
}
down_write(&newcon->sock_sem);
if (newcon->sock) {
- struct connection *othercon = newcon->othercon;
+ struct connection *othercon = newcon->othercon;
if (!othercon) {
- othercon = kmem_cache_alloc(con_cache, GFP_KERNEL);
+ othercon = kmem_cache_zalloc(con_cache, GFP_KERNEL);
if (!othercon) {
printk("dlm: failed to allocate incoming socket\n");
up_write(&newcon->sock_sem);
result = -ENOMEM;
goto accept_err;
}
- memset(othercon, 0, sizeof(*othercon));
othercon->nodeid = nodeid;
othercon->rx_action = receive_from_sock;
init_rwsem(&othercon->sock_sem);
return 0;
- accept_err:
+accept_err:
up_read(&con->sock_sem);
sock_release(newsock);
}
/* Connect a new socket to its peer */
-static int connect_to_sock(struct connection *con)
+static void connect_to_sock(struct connection *con)
{
int result = -EHOSTUNREACH;
struct sockaddr_storage saddr;
if (con->nodeid == 0) {
log_print("attempt to connect sock 0 foiled");
- return 0;
+ return;
}
down_write(&con->sock_sem);
}
/* Create a socket to communicate with */
- result = sock_create_kern(dlm_local_addr.ss_family, SOCK_STREAM, IPPROTO_TCP, &sock);
+ result = sock_create_kern(dlm_local_addr.ss_family, SOCK_STREAM,
+ IPPROTO_TCP, &sock);
if (result < 0)
goto out_err;
memset(&saddr, 0, sizeof(saddr));
if (dlm_nodeid_to_addr(con->nodeid, &saddr))
- goto out_err;
+ goto out_err;
sock->sk->sk_user_data = con;
con->rx_action = receive_from_sock;
log_print("connecting to %d", con->nodeid);
result =
sock->ops->connect(sock, (struct sockaddr *)&saddr, addr_len,
- O_NONBLOCK);
+ O_NONBLOCK);
if (result == -EINPROGRESS)
result = 0;
- if (result != 0)
- goto out_err;
-
- out:
- up_write(&con->sock_sem);
- /*
- * Returning an error here means we've given up trying to connect to
- * a remote node, otherwise we return 0 and reschedule the connetion
- * attempt
- */
- return result;
+ if (result == 0)
+ goto out;
- out_err:
+out_err:
if (con->sock) {
sock_release(con->sock);
con->sock = NULL;
lowcomms_connect_sock(con);
result = 0;
}
- goto out;
+out:
+ up_write(&con->sock_sem);
+ return;
}
-static struct socket *create_listen_sock(struct connection *con, struct sockaddr_storage *saddr)
+static struct socket *create_listen_sock(struct connection *con,
+ struct sockaddr_storage *saddr)
{
- struct socket *sock = NULL;
+ struct socket *sock = NULL;
mm_segment_t fs;
int result = 0;
int one = 1;
fs = get_fs();
set_fs(get_ds());
- result = sock_setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (char *)&one, sizeof(one));
+ result = sock_setsockopt(sock, SOL_SOCKET, SO_REUSEADDR,
+ (char *)&one, sizeof(one));
set_fs(fs);
if (result < 0) {
- printk("dlm: Failed to set SO_REUSEADDR on socket: result=%d\n",result);
+ printk("dlm: Failed to set SO_REUSEADDR on socket: result=%d\n",
+ result);
}
sock->sk->sk_user_data = con;
con->rx_action = accept_from_sock;
fs = get_fs();
set_fs(get_ds());
- result = sock_setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE, (char *)&one, sizeof(one));
+ result = sock_setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE,
+ (char *)&one, sizeof(one));
set_fs(fs);
if (result < 0) {
printk("dlm: Set keepalive failed: %d\n", result);
goto create_out;
}
- create_out:
+create_out:
return sock;
}
int result = -EINVAL;
/* We don't support multi-homed hosts */
- memset(con, 0, sizeof(*con));
- init_rwsem(&con->sock_sem);
- spin_lock_init(&con->writequeue_lock);
- INIT_LIST_HEAD(&con->writequeue);
set_bit(CF_IS_OTHERCON, &con->flags);
sock = create_listen_sock(con, &dlm_local_addr);
int offset = 0;
int users = 0;
- if (!atomic_read(&accepting))
- return NULL;
-
con = nodeid2con(nodeid, allocation);
if (!con)
return NULL;
- spin_lock(&con->writequeue_lock);
e = list_entry(con->writequeue.prev, struct writequeue_entry, list);
- if (((struct list_head *) e == &con->writequeue) ||
+ if ((&e->list == &con->writequeue) ||
(PAGE_CACHE_SIZE - e->end < len)) {
e = NULL;
} else {
spin_unlock(&con->writequeue_lock);
if (e) {
- got_one:
+ got_one:
if (users == 0)
kmap(e->page);
*ppc = page_address(e->page) + offset;
struct connection *con = e->con;
int users;
- if (!atomic_read(&accepting))
- return;
-
- spin_lock(&con->writequeue_lock);
users = --e->users;
if (users)
goto out;
}
return;
- out:
+out:
spin_unlock(&con->writequeue_lock);
return;
}
}
/* Send a message */
-static int send_to_sock(struct connection *con)
+static void send_to_sock(struct connection *con)
{
int ret = 0;
ssize_t(*sendpage) (struct socket *, struct page *, int, size_t, int);
}
else {
/* Don't starve people filling buffers */
- schedule();
+ cond_resched();
}
spin_lock(&con->writequeue_lock);
if (e->len == 0 && e->users == 0) {
list_del(&e->list);
+ kunmap(e->page);
free_entry(e);
continue;
}
}
spin_unlock(&con->writequeue_lock);
- out:
+out:
up_read(&con->sock_sem);
- return ret;
+ return;
- send_error:
+send_error:
up_read(&con->sock_sem);
- close_connection(con, FALSE);
+ close_connection(con, false);
lowcomms_connect_sock(con);
- return ret;
+ return;
- out_connect:
+out_connect:
up_read(&con->sock_sem);
lowcomms_connect_sock(con);
- return 0;
+ return;
}
static void clean_one_writequeue(struct connection *con)
con = nodeid2con(nodeid, 0);
if (con) {
clean_one_writequeue(con);
- close_connection(con, TRUE);
+ close_connection(con, true);
atomic_set(&con->waiting_requests, 0);
}
return 0;
- out:
+out:
return -1;
}
list_for_each_safe(list, temp, &read_sockets) {
struct connection *con =
- list_entry(list, struct connection, read_list);
+ list_entry(list, struct connection, read_list);
list_del(&con->read_list);
clear_bit(CF_READ_PENDING, &con->flags);
/* Don't starve out everyone else */
if (++count >= MAX_RX_MSG_COUNT) {
- schedule();
+ cond_resched();
count = 0;
}
{
struct list_head *list;
struct list_head *temp;
- int ret;
spin_lock_bh(&write_sockets_lock);
list_for_each_safe(list, temp, &write_sockets) {
struct connection *con =
- list_entry(list, struct connection, write_list);
+ list_entry(list, struct connection, write_list);
clear_bit(CF_WRITE_PENDING, &con->flags);
list_del(&con->write_list);
spin_unlock_bh(&write_sockets_lock);
-
- ret = send_to_sock(con);
- if (ret < 0) {
- }
+ send_to_sock(con);
spin_lock_bh(&write_sockets_lock);
}
spin_unlock_bh(&write_sockets_lock);
{
struct list_head *list;
struct list_head *temp;
- int ret;
spin_lock_bh(&state_sockets_lock);
list_for_each_safe(list, temp, &state_sockets) {
struct connection *con =
- list_entry(list, struct connection, state_list);
+ list_entry(list, struct connection, state_list);
list_del(&con->state_list);
clear_bit(CF_CONNECT_PENDING, &con->flags);
spin_unlock_bh(&state_sockets_lock);
- ret = connect_to_sock(con);
- if (ret < 0) {
- }
+ connect_to_sock(con);
spin_lock_bh(&state_sockets_lock);
}
spin_unlock_bh(&state_sockets_lock);
/* DLM Transport comms receive daemon */
static int dlm_recvd(void *data)
{
- init_waitqueue_head(&lowcomms_recv_waitq);
init_waitqueue_entry(&lowcomms_recv_waitq_head, current);
add_wait_queue(&lowcomms_recv_waitq, &lowcomms_recv_waitq_head);
while (!kthread_should_stop()) {
set_current_state(TASK_INTERRUPTIBLE);
if (read_list_empty())
- schedule();
+ cond_resched();
set_current_state(TASK_RUNNING);
process_sockets();
/* DLM Transport send daemon */
static int dlm_sendd(void *data)
{
- init_waitqueue_head(&lowcomms_send_waitq);
init_waitqueue_entry(&lowcomms_send_waitq_head, current);
add_wait_queue(&lowcomms_send_waitq, &lowcomms_send_waitq_head);
while (!kthread_should_stop()) {
set_current_state(TASK_INTERRUPTIBLE);
if (write_and_state_lists_empty())
- schedule();
+ cond_resched();
set_current_state(TASK_RUNNING);
process_state_queue();
p = kthread_run(dlm_recvd, NULL, "dlm_recvd");
error = IS_ERR(p);
- if (error) {
+ if (error) {
log_print("can't start dlm_recvd %d", error);
return error;
}
p = kthread_run(dlm_sendd, NULL, "dlm_sendd");
error = IS_ERR(p);
- if (error) {
+ if (error) {
log_print("can't start dlm_sendd %d", error);
kthread_stop(recv_task);
return error;
{
int i;
- atomic_set(&accepting, 0);
-
- /* Set all the activity flags to prevent any
+ /* Set all the flags to prevent any
socket activity.
*/
for (i = 0; i < conn_array_size; i++) {
if (connections[i])
- connections[i]->flags |= 0x7;
+ connections[i]->flags |= 0xFF;
}
+
daemons_stop();
clean_writequeues();
for (i = 0; i < conn_array_size; i++) {
if (connections[i]) {
- close_connection(connections[i], TRUE);
+ close_connection(connections[i], true);
if (connections[i]->othercon)
kmem_cache_free(con_cache, connections[i]->othercon);
kmem_cache_free(con_cache, connections[i]);
{
int error = 0;
- error = -ENOTCONN;
-
- /*
- * Temporarily initialise the waitq head so that lowcomms_send_message
- * doesn't crash if it gets called before the thread is fully
- * initialised
- */
- init_waitqueue_head(&lowcomms_send_waitq);
-
error = -ENOMEM;
- connections = kmalloc(sizeof(struct connection *) *
+ connections = kzalloc(sizeof(struct connection *) *
NODE_INCREMENT, GFP_KERNEL);
if (!connections)
goto out;
- memset(connections, 0,
- sizeof(struct connection *) * NODE_INCREMENT);
-
conn_array_size = NODE_INCREMENT;
if (dlm_our_addr(&dlm_local_addr, 0)) {
}
con_cache = kmem_cache_create("dlm_conn", sizeof(struct connection),
- __alignof__(struct connection), 0, NULL, NULL);
+ __alignof__(struct connection), 0,
+ NULL, NULL);
if (!con_cache)
goto fail_free_conn;
if (error)
goto fail_unlisten;
- atomic_set(&accepting, 1);
-
return 0;
- fail_unlisten:
- close_connection(connections[0], 0);
+fail_unlisten:
+ close_connection(connections[0], false);
kmem_cache_free(con_cache, connections[0]);
kmem_cache_destroy(con_cache);
- fail_free_conn:
+fail_free_conn:
kfree(connections);
- out:
+out:
return error;
}
-int dlm_lowcomms_init(void)
-{
- INIT_LIST_HEAD(&read_sockets);
- INIT_LIST_HEAD(&write_sockets);
- INIT_LIST_HEAD(&state_sockets);
-
- spin_lock_init(&read_sockets_lock);
- spin_lock_init(&write_sockets_lock);
- spin_lock_init(&state_sockets_lock);
- init_MUTEX(&connections_lock);
-
- return 0;
-}
-
-void dlm_lowcomms_exit(void)
-{
-}
-
/*
* Overrides for Emacs so that we follow Linus's tabbing style.
* Emacs will notice this stuff at the end of the file and automatically
projects / linux-2.6 / blobdiff