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Merge branch 'stealer/ipvs/sync-daemon-cleanup-for-next' of git://git.stealer.net/linux-2.6
This commit is contained in:
David S. Miller
commit
885a4c966b
@ -27,10 +27,12 @@
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#include <linux/in.h>
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#include <linux/igmp.h> /* for ip_mc_join_group */
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#include <linux/udp.h>
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#include <linux/err.h>
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#include <linux/kthread.h>
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#include <linux/wait.h>
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#include <net/ip.h>
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#include <net/sock.h>
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#include <asm/uaccess.h> /* for get_fs and set_fs */
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#include <net/ip_vs.h>
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@ -66,8 +68,8 @@ struct ip_vs_sync_conn_options {
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};
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struct ip_vs_sync_thread_data {
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struct completion *startup;
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int state;
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struct socket *sock;
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char *buf;
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};
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#define SIMPLE_CONN_SIZE (sizeof(struct ip_vs_sync_conn))
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@ -138,18 +140,19 @@ volatile int ip_vs_backup_syncid = 0;
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char ip_vs_master_mcast_ifn[IP_VS_IFNAME_MAXLEN];
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char ip_vs_backup_mcast_ifn[IP_VS_IFNAME_MAXLEN];
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/* sync daemon tasks */
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static struct task_struct *sync_master_thread;
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static struct task_struct *sync_backup_thread;
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/* multicast addr */
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static struct sockaddr_in mcast_addr;
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static struct sockaddr_in mcast_addr = {
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.sin_family = AF_INET,
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.sin_port = __constant_htons(IP_VS_SYNC_PORT),
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.sin_addr.s_addr = __constant_htonl(IP_VS_SYNC_GROUP),
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};
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static inline void sb_queue_tail(struct ip_vs_sync_buff *sb)
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{
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spin_lock(&ip_vs_sync_lock);
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list_add_tail(&sb->list, &ip_vs_sync_queue);
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spin_unlock(&ip_vs_sync_lock);
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}
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static inline struct ip_vs_sync_buff * sb_dequeue(void)
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static inline struct ip_vs_sync_buff *sb_dequeue(void)
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{
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struct ip_vs_sync_buff *sb;
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@ -193,6 +196,16 @@ static inline void ip_vs_sync_buff_release(struct ip_vs_sync_buff *sb)
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kfree(sb);
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}
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static inline void sb_queue_tail(struct ip_vs_sync_buff *sb)
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{
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spin_lock(&ip_vs_sync_lock);
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if (ip_vs_sync_state & IP_VS_STATE_MASTER)
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list_add_tail(&sb->list, &ip_vs_sync_queue);
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else
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ip_vs_sync_buff_release(sb);
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spin_unlock(&ip_vs_sync_lock);
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}
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/*
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* Get the current sync buffer if it has been created for more
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* than the specified time or the specified time is zero.
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@ -572,14 +585,17 @@ static int bind_mcastif_addr(struct socket *sock, char *ifname)
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static struct socket * make_send_sock(void)
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{
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struct socket *sock;
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int result;
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/* First create a socket */
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if (sock_create_kern(PF_INET, SOCK_DGRAM, IPPROTO_UDP, &sock) < 0) {
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result = sock_create_kern(PF_INET, SOCK_DGRAM, IPPROTO_UDP, &sock);
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if (result < 0) {
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IP_VS_ERR("Error during creation of socket; terminating\n");
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return NULL;
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return ERR_PTR(result);
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}
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if (set_mcast_if(sock->sk, ip_vs_master_mcast_ifn) < 0) {
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result = set_mcast_if(sock->sk, ip_vs_master_mcast_ifn);
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if (result < 0) {
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IP_VS_ERR("Error setting outbound mcast interface\n");
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goto error;
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}
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@ -587,14 +603,15 @@ static struct socket * make_send_sock(void)
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set_mcast_loop(sock->sk, 0);
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set_mcast_ttl(sock->sk, 1);
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if (bind_mcastif_addr(sock, ip_vs_master_mcast_ifn) < 0) {
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result = bind_mcastif_addr(sock, ip_vs_master_mcast_ifn);
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if (result < 0) {
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IP_VS_ERR("Error binding address of the mcast interface\n");
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goto error;
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}
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if (sock->ops->connect(sock,
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(struct sockaddr*)&mcast_addr,
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sizeof(struct sockaddr), 0) < 0) {
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result = sock->ops->connect(sock, (struct sockaddr *) &mcast_addr,
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sizeof(struct sockaddr), 0);
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if (result < 0) {
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IP_VS_ERR("Error connecting to the multicast addr\n");
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goto error;
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}
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@ -603,7 +620,7 @@ static struct socket * make_send_sock(void)
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error:
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sock_release(sock);
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return NULL;
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return ERR_PTR(result);
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}
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@ -613,27 +630,30 @@ static struct socket * make_send_sock(void)
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static struct socket * make_receive_sock(void)
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{
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struct socket *sock;
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int result;
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/* First create a socket */
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if (sock_create_kern(PF_INET, SOCK_DGRAM, IPPROTO_UDP, &sock) < 0) {
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result = sock_create_kern(PF_INET, SOCK_DGRAM, IPPROTO_UDP, &sock);
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if (result < 0) {
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IP_VS_ERR("Error during creation of socket; terminating\n");
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return NULL;
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return ERR_PTR(result);
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}
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/* it is equivalent to the REUSEADDR option in user-space */
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sock->sk->sk_reuse = 1;
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if (sock->ops->bind(sock,
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(struct sockaddr*)&mcast_addr,
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sizeof(struct sockaddr)) < 0) {
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result = sock->ops->bind(sock, (struct sockaddr *) &mcast_addr,
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sizeof(struct sockaddr));
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if (result < 0) {
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IP_VS_ERR("Error binding to the multicast addr\n");
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goto error;
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}
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/* join the multicast group */
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if (join_mcast_group(sock->sk,
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(struct in_addr*)&mcast_addr.sin_addr,
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ip_vs_backup_mcast_ifn) < 0) {
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result = join_mcast_group(sock->sk,
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(struct in_addr *) &mcast_addr.sin_addr,
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ip_vs_backup_mcast_ifn);
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if (result < 0) {
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IP_VS_ERR("Error joining to the multicast group\n");
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goto error;
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}
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@ -642,7 +662,7 @@ static struct socket * make_receive_sock(void)
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error:
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sock_release(sock);
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return NULL;
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return ERR_PTR(result);
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}
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@ -700,44 +720,29 @@ ip_vs_receive(struct socket *sock, char *buffer, const size_t buflen)
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}
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static DECLARE_WAIT_QUEUE_HEAD(sync_wait);
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static pid_t sync_master_pid = 0;
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static pid_t sync_backup_pid = 0;
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static DECLARE_WAIT_QUEUE_HEAD(stop_sync_wait);
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static int stop_master_sync = 0;
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static int stop_backup_sync = 0;
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static void sync_master_loop(void)
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static int sync_thread_master(void *data)
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{
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struct socket *sock;
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struct ip_vs_sync_thread_data *tinfo = data;
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struct ip_vs_sync_buff *sb;
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/* create the sending multicast socket */
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sock = make_send_sock();
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if (!sock)
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return;
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IP_VS_INFO("sync thread started: state = MASTER, mcast_ifn = %s, "
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"syncid = %d\n",
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ip_vs_master_mcast_ifn, ip_vs_master_syncid);
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for (;;) {
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while ((sb=sb_dequeue())) {
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ip_vs_send_sync_msg(sock, sb->mesg);
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while (!kthread_should_stop()) {
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while ((sb = sb_dequeue())) {
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ip_vs_send_sync_msg(tinfo->sock, sb->mesg);
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ip_vs_sync_buff_release(sb);
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}
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/* check if entries stay in curr_sb for 2 seconds */
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if ((sb = get_curr_sync_buff(2*HZ))) {
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ip_vs_send_sync_msg(sock, sb->mesg);
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sb = get_curr_sync_buff(2 * HZ);
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if (sb) {
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ip_vs_send_sync_msg(tinfo->sock, sb->mesg);
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ip_vs_sync_buff_release(sb);
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}
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if (stop_master_sync)
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break;
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msleep_interruptible(1000);
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schedule_timeout_interruptible(HZ);
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}
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/* clean up the sync_buff queue */
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@ -751,185 +756,48 @@ static void sync_master_loop(void)
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}
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/* release the sending multicast socket */
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sock_release(sock);
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sock_release(tinfo->sock);
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kfree(tinfo);
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return 0;
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}
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static void sync_backup_loop(void)
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static int sync_thread_backup(void *data)
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{
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struct socket *sock;
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char *buf;
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struct ip_vs_sync_thread_data *tinfo = data;
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int len;
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if (!(buf = kmalloc(sync_recv_mesg_maxlen, GFP_ATOMIC))) {
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IP_VS_ERR("sync_backup_loop: kmalloc error\n");
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return;
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}
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/* create the receiving multicast socket */
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sock = make_receive_sock();
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if (!sock)
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goto out;
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IP_VS_INFO("sync thread started: state = BACKUP, mcast_ifn = %s, "
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"syncid = %d\n",
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ip_vs_backup_mcast_ifn, ip_vs_backup_syncid);
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for (;;) {
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/* do you have data now? */
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while (!skb_queue_empty(&(sock->sk->sk_receive_queue))) {
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if ((len =
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ip_vs_receive(sock, buf,
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sync_recv_mesg_maxlen)) <= 0) {
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while (!kthread_should_stop()) {
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wait_event_interruptible(*tinfo->sock->sk->sk_sleep,
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!skb_queue_empty(&tinfo->sock->sk->sk_receive_queue)
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|| kthread_should_stop());
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/* do we have data now? */
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while (!skb_queue_empty(&(tinfo->sock->sk->sk_receive_queue))) {
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len = ip_vs_receive(tinfo->sock, tinfo->buf,
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sync_recv_mesg_maxlen);
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if (len <= 0) {
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IP_VS_ERR("receiving message error\n");
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break;
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}
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/* disable bottom half, because it accessed the data
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/* disable bottom half, because it accesses the data
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shared by softirq while getting/creating conns */
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local_bh_disable();
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ip_vs_process_message(buf, len);
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ip_vs_process_message(tinfo->buf, len);
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local_bh_enable();
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}
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if (stop_backup_sync)
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break;
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msleep_interruptible(1000);
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}
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/* release the sending multicast socket */
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sock_release(sock);
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out:
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kfree(buf);
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}
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static void set_sync_pid(int sync_state, pid_t sync_pid)
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{
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if (sync_state == IP_VS_STATE_MASTER)
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sync_master_pid = sync_pid;
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else if (sync_state == IP_VS_STATE_BACKUP)
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sync_backup_pid = sync_pid;
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}
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static void set_stop_sync(int sync_state, int set)
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{
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if (sync_state == IP_VS_STATE_MASTER)
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stop_master_sync = set;
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else if (sync_state == IP_VS_STATE_BACKUP)
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stop_backup_sync = set;
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else {
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stop_master_sync = set;
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stop_backup_sync = set;
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}
|
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}
|
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|
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static int sync_thread(void *startup)
|
||||
{
|
||||
DECLARE_WAITQUEUE(wait, current);
|
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mm_segment_t oldmm;
|
||||
int state;
|
||||
const char *name;
|
||||
struct ip_vs_sync_thread_data *tinfo = startup;
|
||||
|
||||
/* increase the module use count */
|
||||
ip_vs_use_count_inc();
|
||||
|
||||
if (ip_vs_sync_state & IP_VS_STATE_MASTER && !sync_master_pid) {
|
||||
state = IP_VS_STATE_MASTER;
|
||||
name = "ipvs_syncmaster";
|
||||
} else if (ip_vs_sync_state & IP_VS_STATE_BACKUP && !sync_backup_pid) {
|
||||
state = IP_VS_STATE_BACKUP;
|
||||
name = "ipvs_syncbackup";
|
||||
} else {
|
||||
IP_VS_BUG();
|
||||
ip_vs_use_count_dec();
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
daemonize(name);
|
||||
|
||||
oldmm = get_fs();
|
||||
set_fs(KERNEL_DS);
|
||||
|
||||
/* Block all signals */
|
||||
spin_lock_irq(¤t->sighand->siglock);
|
||||
siginitsetinv(¤t->blocked, 0);
|
||||
recalc_sigpending();
|
||||
spin_unlock_irq(¤t->sighand->siglock);
|
||||
|
||||
/* set the maximum length of sync message */
|
||||
set_sync_mesg_maxlen(state);
|
||||
|
||||
/* set up multicast address */
|
||||
mcast_addr.sin_family = AF_INET;
|
||||
mcast_addr.sin_port = htons(IP_VS_SYNC_PORT);
|
||||
mcast_addr.sin_addr.s_addr = htonl(IP_VS_SYNC_GROUP);
|
||||
|
||||
add_wait_queue(&sync_wait, &wait);
|
||||
|
||||
set_sync_pid(state, task_pid_nr(current));
|
||||
complete(tinfo->startup);
|
||||
|
||||
/*
|
||||
* once we call the completion queue above, we should
|
||||
* null out that reference, since its allocated on the
|
||||
* stack of the creating kernel thread
|
||||
*/
|
||||
tinfo->startup = NULL;
|
||||
|
||||
/* processing master/backup loop here */
|
||||
if (state == IP_VS_STATE_MASTER)
|
||||
sync_master_loop();
|
||||
else if (state == IP_VS_STATE_BACKUP)
|
||||
sync_backup_loop();
|
||||
else IP_VS_BUG();
|
||||
|
||||
remove_wait_queue(&sync_wait, &wait);
|
||||
|
||||
/* thread exits */
|
||||
|
||||
/*
|
||||
* If we weren't explicitly stopped, then we
|
||||
* exited in error, and should undo our state
|
||||
*/
|
||||
if ((!stop_master_sync) && (!stop_backup_sync))
|
||||
ip_vs_sync_state -= tinfo->state;
|
||||
|
||||
set_sync_pid(state, 0);
|
||||
IP_VS_INFO("sync thread stopped!\n");
|
||||
|
||||
set_fs(oldmm);
|
||||
|
||||
/* decrease the module use count */
|
||||
ip_vs_use_count_dec();
|
||||
|
||||
set_stop_sync(state, 0);
|
||||
wake_up(&stop_sync_wait);
|
||||
|
||||
/*
|
||||
* we need to free the structure that was allocated
|
||||
* for us in start_sync_thread
|
||||
*/
|
||||
sock_release(tinfo->sock);
|
||||
kfree(tinfo->buf);
|
||||
kfree(tinfo);
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
||||
static int fork_sync_thread(void *startup)
|
||||
{
|
||||
pid_t pid;
|
||||
|
||||
/* fork the sync thread here, then the parent process of the
|
||||
sync thread is the init process after this thread exits. */
|
||||
repeat:
|
||||
if ((pid = kernel_thread(sync_thread, startup, 0)) < 0) {
|
||||
IP_VS_ERR("could not create sync_thread due to %d... "
|
||||
"retrying.\n", pid);
|
||||
msleep_interruptible(1000);
|
||||
goto repeat;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
@ -937,81 +805,126 @@ static int fork_sync_thread(void *startup)
|
||||
|
||||
int start_sync_thread(int state, char *mcast_ifn, __u8 syncid)
|
||||
{
|
||||
DECLARE_COMPLETION_ONSTACK(startup);
|
||||
pid_t pid;
|
||||
struct ip_vs_sync_thread_data *tinfo;
|
||||
|
||||
if ((state == IP_VS_STATE_MASTER && sync_master_pid) ||
|
||||
(state == IP_VS_STATE_BACKUP && sync_backup_pid))
|
||||
return -EEXIST;
|
||||
|
||||
/*
|
||||
* Note that tinfo will be freed in sync_thread on exit
|
||||
*/
|
||||
tinfo = kmalloc(sizeof(struct ip_vs_sync_thread_data), GFP_KERNEL);
|
||||
if (!tinfo)
|
||||
return -ENOMEM;
|
||||
struct task_struct **realtask, *task;
|
||||
struct socket *sock;
|
||||
char *name, *buf = NULL;
|
||||
int (*threadfn)(void *data);
|
||||
int result = -ENOMEM;
|
||||
|
||||
IP_VS_DBG(7, "%s: pid %d\n", __func__, task_pid_nr(current));
|
||||
IP_VS_DBG(7, "Each ip_vs_sync_conn entry need %Zd bytes\n",
|
||||
IP_VS_DBG(7, "Each ip_vs_sync_conn entry needs %Zd bytes\n",
|
||||
sizeof(struct ip_vs_sync_conn));
|
||||
|
||||
ip_vs_sync_state |= state;
|
||||
if (state == IP_VS_STATE_MASTER) {
|
||||
if (sync_master_thread)
|
||||
return -EEXIST;
|
||||
|
||||
strlcpy(ip_vs_master_mcast_ifn, mcast_ifn,
|
||||
sizeof(ip_vs_master_mcast_ifn));
|
||||
ip_vs_master_syncid = syncid;
|
||||
} else {
|
||||
realtask = &sync_master_thread;
|
||||
name = "ipvs_syncmaster";
|
||||
threadfn = sync_thread_master;
|
||||
sock = make_send_sock();
|
||||
} else if (state == IP_VS_STATE_BACKUP) {
|
||||
if (sync_backup_thread)
|
||||
return -EEXIST;
|
||||
|
||||
strlcpy(ip_vs_backup_mcast_ifn, mcast_ifn,
|
||||
sizeof(ip_vs_backup_mcast_ifn));
|
||||
ip_vs_backup_syncid = syncid;
|
||||
realtask = &sync_backup_thread;
|
||||
name = "ipvs_syncbackup";
|
||||
threadfn = sync_thread_backup;
|
||||
sock = make_receive_sock();
|
||||
} else {
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
tinfo->state = state;
|
||||
tinfo->startup = &startup;
|
||||
|
||||
repeat:
|
||||
if ((pid = kernel_thread(fork_sync_thread, tinfo, 0)) < 0) {
|
||||
IP_VS_ERR("could not create fork_sync_thread due to %d... "
|
||||
"retrying.\n", pid);
|
||||
msleep_interruptible(1000);
|
||||
goto repeat;
|
||||
if (IS_ERR(sock)) {
|
||||
result = PTR_ERR(sock);
|
||||
goto out;
|
||||
}
|
||||
|
||||
wait_for_completion(&startup);
|
||||
set_sync_mesg_maxlen(state);
|
||||
if (state == IP_VS_STATE_BACKUP) {
|
||||
buf = kmalloc(sync_recv_mesg_maxlen, GFP_KERNEL);
|
||||
if (!buf)
|
||||
goto outsocket;
|
||||
}
|
||||
|
||||
tinfo = kmalloc(sizeof(*tinfo), GFP_KERNEL);
|
||||
if (!tinfo)
|
||||
goto outbuf;
|
||||
|
||||
tinfo->sock = sock;
|
||||
tinfo->buf = buf;
|
||||
|
||||
task = kthread_run(threadfn, tinfo, name);
|
||||
if (IS_ERR(task)) {
|
||||
result = PTR_ERR(task);
|
||||
goto outtinfo;
|
||||
}
|
||||
|
||||
/* mark as active */
|
||||
*realtask = task;
|
||||
ip_vs_sync_state |= state;
|
||||
|
||||
/* increase the module use count */
|
||||
ip_vs_use_count_inc();
|
||||
|
||||
return 0;
|
||||
|
||||
outtinfo:
|
||||
kfree(tinfo);
|
||||
outbuf:
|
||||
kfree(buf);
|
||||
outsocket:
|
||||
sock_release(sock);
|
||||
out:
|
||||
return result;
|
||||
}
|
||||
|
||||
|
||||
int stop_sync_thread(int state)
|
||||
{
|
||||
DECLARE_WAITQUEUE(wait, current);
|
||||
|
||||
if ((state == IP_VS_STATE_MASTER && !sync_master_pid) ||
|
||||
(state == IP_VS_STATE_BACKUP && !sync_backup_pid))
|
||||
return -ESRCH;
|
||||
|
||||
IP_VS_DBG(7, "%s: pid %d\n", __func__, task_pid_nr(current));
|
||||
IP_VS_INFO("stopping sync thread %d ...\n",
|
||||
(state == IP_VS_STATE_MASTER) ?
|
||||
sync_master_pid : sync_backup_pid);
|
||||
|
||||
__set_current_state(TASK_UNINTERRUPTIBLE);
|
||||
add_wait_queue(&stop_sync_wait, &wait);
|
||||
set_stop_sync(state, 1);
|
||||
ip_vs_sync_state -= state;
|
||||
wake_up(&sync_wait);
|
||||
schedule();
|
||||
__set_current_state(TASK_RUNNING);
|
||||
remove_wait_queue(&stop_sync_wait, &wait);
|
||||
if (state == IP_VS_STATE_MASTER) {
|
||||
if (!sync_master_thread)
|
||||
return -ESRCH;
|
||||
|
||||
/* Note: no need to reap the sync thread, because its parent
|
||||
process is the init process */
|
||||
IP_VS_INFO("stopping master sync thread %d ...\n",
|
||||
task_pid_nr(sync_master_thread));
|
||||
|
||||
if ((state == IP_VS_STATE_MASTER && stop_master_sync) ||
|
||||
(state == IP_VS_STATE_BACKUP && stop_backup_sync))
|
||||
IP_VS_BUG();
|
||||
/*
|
||||
* The lock synchronizes with sb_queue_tail(), so that we don't
|
||||
* add sync buffers to the queue, when we are already in
|
||||
* progress of stopping the master sync daemon.
|
||||
*/
|
||||
|
||||
spin_lock(&ip_vs_sync_lock);
|
||||
ip_vs_sync_state &= ~IP_VS_STATE_MASTER;
|
||||
spin_unlock(&ip_vs_sync_lock);
|
||||
kthread_stop(sync_master_thread);
|
||||
sync_master_thread = NULL;
|
||||
} else if (state == IP_VS_STATE_BACKUP) {
|
||||
if (!sync_backup_thread)
|
||||
return -ESRCH;
|
||||
|
||||
IP_VS_INFO("stopping backup sync thread %d ...\n",
|
||||
task_pid_nr(sync_backup_thread));
|
||||
|
||||
ip_vs_sync_state &= ~IP_VS_STATE_BACKUP;
|
||||
kthread_stop(sync_backup_thread);
|
||||
sync_backup_thread = NULL;
|
||||
} else {
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
/* decrease the module use count */
|
||||
ip_vs_use_count_dec();
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user