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fs/dlm/lowcomms.c
38.3 KB
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/****************************************************************************** ******************************************************************************* ** ** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. |
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** Copyright (C) 2004-2009 Red Hat, Inc. All rights reserved. |
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** ** This copyrighted material is made available to anyone wishing to use, ** modify, copy, or redistribute it subject to the terms and conditions ** of the GNU General Public License v.2. ** ******************************************************************************* ******************************************************************************/ /* * 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 |
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* be expanded for the cluster infrastructure then that is its |
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* 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. * |
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* lowcomms will choose to use either TCP or SCTP as its transport layer |
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* depending on the configuration variable 'protocol'. This should be set |
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* to 0 (default) for TCP or 1 for SCTP. It should be configured using a |
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* cluster-wide mechanism as it must be the same on all nodes of the cluster * for the DLM to function. |
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* */ |
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#include <asm/ioctls.h> #include <net/sock.h> #include <net/tcp.h> #include <linux/pagemap.h> |
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#include <linux/file.h> |
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#include <linux/mutex.h> |
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#include <linux/sctp.h> |
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#include <linux/slab.h> |
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#include <net/sctp/user.h> |
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#include <net/ipv6.h> |
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#include "dlm_internal.h" #include "lowcomms.h" #include "midcomms.h" #include "config.h" |
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#define NEEDED_RMEM (4*1024*1024) |
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#define CONN_HASH_SIZE 32 |
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/* Number of messages to send before rescheduling */ #define MAX_SEND_MSG_COUNT 25 |
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struct cbuf { |
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unsigned int base; unsigned int len; unsigned int mask; |
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}; |
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static void cbuf_add(struct cbuf *cb, int n) { cb->len += n; } |
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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; } |
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struct connection { struct socket *sock; /* NULL if not connected */ uint32_t nodeid; /* So we know who we are in the list */ |
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struct mutex sock_mutex; |
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unsigned long flags; |
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#define CF_READ_PENDING 1 #define CF_WRITE_PENDING 2 #define CF_CONNECT_PENDING 3 |
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#define CF_INIT_PENDING 4 #define CF_IS_OTHERCON 5 |
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#define CF_CLOSE 6 |
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#define CF_APP_LIMITED 7 |
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struct list_head writequeue; /* List of outgoing writequeue_entries */ |
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spinlock_t writequeue_lock; int (*rx_action) (struct connection *); /* What to do when active */ |
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void (*connect_action) (struct connection *); /* What to do to connect */ |
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struct page *rx_page; struct cbuf cb; int retries; |
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#define MAX_CONNECT_RETRIES 3 |
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int sctp_assoc; |
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struct hlist_node list; |
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struct connection *othercon; |
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struct work_struct rwork; /* Receive workqueue */ struct work_struct swork; /* Send workqueue */ |
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}; #define sock2con(x) ((struct connection *)(x)->sk_user_data) /* An entry waiting to be sent */ struct writequeue_entry { struct list_head list; struct page *page; int offset; int len; int end; int users; struct connection *con; }; |
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static struct sockaddr_storage *dlm_local_addr[DLM_MAX_ADDR_COUNT]; static int dlm_local_count; |
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/* Work queues */ static struct workqueue_struct *recv_workqueue; static struct workqueue_struct *send_workqueue; |
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static struct hlist_head connection_hash[CONN_HASH_SIZE]; |
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static DEFINE_MUTEX(connections_lock); |
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static struct kmem_cache *con_cache; |
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static void process_recv_sockets(struct work_struct *work); static void process_send_sockets(struct work_struct *work); |
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/* This is deliberately very simple because most clusters have simple sequential nodeids, so we should be able to go straight to a connection struct in the array */ static inline int nodeid_hash(int nodeid) { return nodeid & (CONN_HASH_SIZE-1); } static struct connection *__find_con(int nodeid) { int r; struct hlist_node *h; struct connection *con; r = nodeid_hash(nodeid); hlist_for_each_entry(con, h, &connection_hash[r], list) { if (con->nodeid == nodeid) return con; } return NULL; } |
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/* * 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) |
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{ struct connection *con = NULL; |
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int r; |
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con = __find_con(nodeid); |
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if (con || !alloc) return con; |
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con = kmem_cache_zalloc(con_cache, alloc); if (!con) return NULL; |
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r = nodeid_hash(nodeid); hlist_add_head(&con->list, &connection_hash[r]); |
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con->nodeid = nodeid; mutex_init(&con->sock_mutex); INIT_LIST_HEAD(&con->writequeue); spin_lock_init(&con->writequeue_lock); INIT_WORK(&con->swork, process_send_sockets); INIT_WORK(&con->rwork, process_recv_sockets); |
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/* Setup action pointers for child sockets */ if (con->nodeid) { |
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struct connection *zerocon = __find_con(0); |
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con->connect_action = zerocon->connect_action; if (!con->rx_action) con->rx_action = zerocon->rx_action; |
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} |
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return con; } |
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/* Loop round all connections */ static void foreach_conn(void (*conn_func)(struct connection *c)) { int i; struct hlist_node *h, *n; struct connection *con; for (i = 0; i < CONN_HASH_SIZE; i++) { hlist_for_each_entry_safe(con, h, n, &connection_hash[i], list){ conn_func(con); } } } |
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static struct connection *nodeid2con(int nodeid, gfp_t allocation) { struct connection *con; |
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mutex_lock(&connections_lock); |
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con = __nodeid2con(nodeid, allocation); |
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mutex_unlock(&connections_lock); |
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return con; } |
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/* This is a bit drastic, but only called when things go wrong */ static struct connection *assoc2con(int assoc_id) { int i; |
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struct hlist_node *h; |
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struct connection *con; |
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mutex_lock(&connections_lock); |
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for (i = 0 ; i < CONN_HASH_SIZE; i++) { hlist_for_each_entry(con, h, &connection_hash[i], list) { |
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if (con->sctp_assoc == assoc_id) { |
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mutex_unlock(&connections_lock); return con; } |
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} } |
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mutex_unlock(&connections_lock); |
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return NULL; } static int nodeid_to_addr(int nodeid, struct sockaddr *retaddr) { struct sockaddr_storage addr; int error; if (!dlm_local_count) return -1; error = dlm_nodeid_to_addr(nodeid, &addr); if (error) return error; if (dlm_local_addr[0]->ss_family == AF_INET) { struct sockaddr_in *in4 = (struct sockaddr_in *) &addr; struct sockaddr_in *ret4 = (struct sockaddr_in *) retaddr; ret4->sin_addr.s_addr = in4->sin_addr.s_addr; } else { struct sockaddr_in6 *in6 = (struct sockaddr_in6 *) &addr; struct sockaddr_in6 *ret6 = (struct sockaddr_in6 *) retaddr; |
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ret6->sin6_addr = in6->sin6_addr; |
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} return 0; } |
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/* Data available on socket or listen socket received a connect */ static void lowcomms_data_ready(struct sock *sk, int count_unused) { struct connection *con = sock2con(sk); |
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if (con && !test_and_set_bit(CF_READ_PENDING, &con->flags)) |
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queue_work(recv_workqueue, &con->rwork); |
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} static void lowcomms_write_space(struct sock *sk) { struct connection *con = sock2con(sk); |
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if (!con) 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(SOCK_ASYNC_NOSPACE, &con->sock->flags); } if (!test_and_set_bit(CF_WRITE_PENDING, &con->flags)) |
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queue_work(send_workqueue, &con->swork); |
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} static inline void lowcomms_connect_sock(struct connection *con) { |
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if (test_bit(CF_CLOSE, &con->flags)) return; |
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if (!test_and_set_bit(CF_CONNECT_PENDING, &con->flags)) queue_work(send_workqueue, &con->swork); |
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} static void lowcomms_state_change(struct sock *sk) { |
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if (sk->sk_state == TCP_ESTABLISHED) |
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lowcomms_write_space(sk); |
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} |
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int dlm_lowcomms_connect_node(int nodeid) { struct connection *con; |
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/* with sctp there's no connecting without sending */ if (dlm_config.ci_protocol != 0) return 0; |
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if (nodeid == dlm_our_nodeid()) return 0; con = nodeid2con(nodeid, GFP_NOFS); if (!con) return -ENOMEM; lowcomms_connect_sock(con); return 0; } |
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/* Make a socket active */ static int add_sock(struct socket *sock, struct connection *con) { con->sock = sock; /* Install a data_ready callback */ con->sock->sk->sk_data_ready = lowcomms_data_ready; con->sock->sk->sk_write_space = lowcomms_write_space; con->sock->sk->sk_state_change = lowcomms_state_change; |
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con->sock->sk->sk_user_data = con; |
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con->sock->sk->sk_allocation = GFP_NOFS; |
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return 0; } |
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/* Add the port number to an IPv6 or 4 sockaddr and return the address |
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length */ static void make_sockaddr(struct sockaddr_storage *saddr, uint16_t port, int *addr_len) { |
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saddr->ss_family = dlm_local_addr[0]->ss_family; |
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if (saddr->ss_family == AF_INET) { |
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struct sockaddr_in *in4_addr = (struct sockaddr_in *)saddr; in4_addr->sin_port = cpu_to_be16(port); *addr_len = sizeof(struct sockaddr_in); |
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memset(&in4_addr->sin_zero, 0, sizeof(in4_addr->sin_zero)); |
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} else { |
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struct sockaddr_in6 *in6_addr = (struct sockaddr_in6 *)saddr; in6_addr->sin6_port = cpu_to_be16(port); *addr_len = sizeof(struct sockaddr_in6); } |
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memset((char *)saddr + *addr_len, 0, sizeof(struct sockaddr_storage) - *addr_len); |
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} /* Close a remote connection and tidy up */ |
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static void close_connection(struct connection *con, bool and_other) |
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{ |
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mutex_lock(&con->sock_mutex); |
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if (con->sock) { sock_release(con->sock); con->sock = NULL; } if (con->othercon && and_other) { |
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/* Will only re-enter once. */ close_connection(con->othercon, false); |
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} if (con->rx_page) { __free_page(con->rx_page); con->rx_page = NULL; } |
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con->retries = 0; mutex_unlock(&con->sock_mutex); |
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} |
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/* We only send shutdown messages to nodes that are not part of the cluster */ static void sctp_send_shutdown(sctp_assoc_t associd) { static char outcmsg[CMSG_SPACE(sizeof(struct sctp_sndrcvinfo))]; struct msghdr outmessage; struct cmsghdr *cmsg; struct sctp_sndrcvinfo *sinfo; int ret; struct connection *con; con = nodeid2con(0,0); BUG_ON(con == NULL); outmessage.msg_name = NULL; outmessage.msg_namelen = 0; outmessage.msg_control = outcmsg; outmessage.msg_controllen = sizeof(outcmsg); outmessage.msg_flags = MSG_EOR; cmsg = CMSG_FIRSTHDR(&outmessage); cmsg->cmsg_level = IPPROTO_SCTP; cmsg->cmsg_type = SCTP_SNDRCV; cmsg->cmsg_len = CMSG_LEN(sizeof(struct sctp_sndrcvinfo)); outmessage.msg_controllen = cmsg->cmsg_len; sinfo = CMSG_DATA(cmsg); memset(sinfo, 0x00, sizeof(struct sctp_sndrcvinfo)); sinfo->sinfo_flags |= MSG_EOF; sinfo->sinfo_assoc_id = associd; ret = kernel_sendmsg(con->sock, &outmessage, NULL, 0, 0); if (ret != 0) log_print("send EOF to node failed: %d", ret); } |
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static void sctp_init_failed_foreach(struct connection *con) { con->sctp_assoc = 0; if (test_and_clear_bit(CF_CONNECT_PENDING, &con->flags)) { if (!test_and_set_bit(CF_WRITE_PENDING, &con->flags)) queue_work(send_workqueue, &con->swork); } } |
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/* INIT failed but we don't know which node... restart INIT on all pending nodes */ static void sctp_init_failed(void) { |
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mutex_lock(&connections_lock); |
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foreach_conn(sctp_init_failed_foreach); |
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mutex_unlock(&connections_lock); |
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} /* Something happened to an association */ |
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static void process_sctp_notification(struct connection *con, struct msghdr *msg, char *buf) |
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{ union sctp_notification *sn = (union sctp_notification *)buf; if (sn->sn_header.sn_type == SCTP_ASSOC_CHANGE) { switch (sn->sn_assoc_change.sac_state) { case SCTP_COMM_UP: case SCTP_RESTART: { /* Check that the new node is in the lockspace */ struct sctp_prim prim; int nodeid; int prim_len, ret; int addr_len; struct connection *new_con; |
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sctp_peeloff_arg_t parg; int parglen = sizeof(parg); |
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int err; |
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/* * We get this before any data for an association. * We verify that the node is in the cluster and * then peel off a socket for it. */ if ((int)sn->sn_assoc_change.sac_assoc_id <= 0) { log_print("COMM_UP for invalid assoc ID %d", |
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(int)sn->sn_assoc_change.sac_assoc_id); |
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sctp_init_failed(); return; } memset(&prim, 0, sizeof(struct sctp_prim)); prim_len = sizeof(struct sctp_prim); prim.ssp_assoc_id = sn->sn_assoc_change.sac_assoc_id; ret = kernel_getsockopt(con->sock, IPPROTO_SCTP, SCTP_PRIMARY_ADDR, (char*)&prim, &prim_len); if (ret < 0) { log_print("getsockopt/sctp_primary_addr on " "new assoc %d failed : %d", (int)sn->sn_assoc_change.sac_assoc_id, ret); /* Retry INIT later */ new_con = assoc2con(sn->sn_assoc_change.sac_assoc_id); if (new_con) clear_bit(CF_CONNECT_PENDING, &con->flags); return; } make_sockaddr(&prim.ssp_addr, 0, &addr_len); if (dlm_addr_to_nodeid(&prim.ssp_addr, &nodeid)) { |
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unsigned char *b=(unsigned char *)&prim.ssp_addr; log_print("reject connect from unknown addr"); |
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print_hex_dump_bytes("ss: ", DUMP_PREFIX_NONE, b, sizeof(struct sockaddr_storage)); |
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sctp_send_shutdown(prim.ssp_assoc_id); return; } |
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new_con = nodeid2con(nodeid, GFP_NOFS); |
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if (!new_con) return; /* Peel off a new sock */ parg.associd = sn->sn_assoc_change.sac_assoc_id; |
617e82e10 [DLM] lowcomms style |
505 506 |
ret = kernel_getsockopt(con->sock, IPPROTO_SCTP, SCTP_SOCKOPT_PEELOFF, |
6ed7257b4 [DLM] Consolidate... |
507 |
(void *)&parg, &parglen); |
6861f3507 dlm: fix socket f... |
508 |
if (ret < 0) { |
617e82e10 [DLM] lowcomms style |
509 |
log_print("Can't peel off a socket for " |
6861f3507 dlm: fix socket f... |
510 |
"connection %d to node %d: err=%d", |
6ed7257b4 [DLM] Consolidate... |
511 |
parg.associd, nodeid, ret); |
6861f3507 dlm: fix socket f... |
512 513 514 515 516 517 |
return; } new_con->sock = sockfd_lookup(parg.sd, &err); if (!new_con->sock) { log_print("sockfd_lookup error %d", err); return; |
6ed7257b4 [DLM] Consolidate... |
518 |
} |
6ed7257b4 [DLM] Consolidate... |
519 |
add_sock(new_con->sock, new_con); |
6861f3507 dlm: fix socket f... |
520 |
sockfd_put(new_con->sock); |
6ed7257b4 [DLM] Consolidate... |
521 |
|
6861f3507 dlm: fix socket f... |
522 523 |
log_print("connecting to %d sctp association %d", nodeid, (int)sn->sn_assoc_change.sac_assoc_id); |
6ed7257b4 [DLM] Consolidate... |
524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 |
/* Send any pending writes */ clear_bit(CF_CONNECT_PENDING, &new_con->flags); clear_bit(CF_INIT_PENDING, &con->flags); if (!test_and_set_bit(CF_WRITE_PENDING, &new_con->flags)) { queue_work(send_workqueue, &new_con->swork); } if (!test_and_set_bit(CF_READ_PENDING, &new_con->flags)) queue_work(recv_workqueue, &new_con->rwork); } break; case SCTP_COMM_LOST: case SCTP_SHUTDOWN_COMP: { con = assoc2con(sn->sn_assoc_change.sac_assoc_id); if (con) { con->sctp_assoc = 0; } } break; /* We don't know which INIT failed, so clear the PENDING flags * on them all. if assoc_id is zero then it will then try * again */ case SCTP_CANT_STR_ASSOC: { log_print("Can't start SCTP association - retrying"); sctp_init_failed(); } break; default: log_print("unexpected SCTP assoc change id=%d state=%d", (int)sn->sn_assoc_change.sac_assoc_id, sn->sn_assoc_change.sac_state); } } } |
fdda387f7 [DLM] Add support... |
564 565 566 567 |
/* Data received from remote end */ static int receive_from_sock(struct connection *con) { int ret = 0; |
58addbffd [PATCH] dlm: use ... |
568 569 |
struct msghdr msg = {}; struct kvec iov[2]; |
fdda387f7 [DLM] Add support... |
570 571 572 |
unsigned len; int r; int call_again_soon = 0; |
58addbffd [PATCH] dlm: use ... |
573 |
int nvec; |
6ed7257b4 [DLM] Consolidate... |
574 |
char incmsg[CMSG_SPACE(sizeof(struct sctp_sndrcvinfo))]; |
fdda387f7 [DLM] Add support... |
575 |
|
f1f1c1ccf [DLM] Make sock_s... |
576 |
mutex_lock(&con->sock_mutex); |
fdda387f7 [DLM] Add support... |
577 |
|
a34fbc636 [DLM] fix softloc... |
578 579 580 581 |
if (con->sock == NULL) { ret = -EAGAIN; goto out_close; } |
fdda387f7 [DLM] Add support... |
582 583 584 585 586 587 588 589 |
if (con->rx_page == NULL) { /* * This doesn't need to be atomic, but I think it should * improve performance if it is. */ con->rx_page = alloc_page(GFP_ATOMIC); if (con->rx_page == NULL) goto out_resched; |
ac33d0710 [DLM] Clean up lo... |
590 |
cbuf_init(&con->cb, PAGE_CACHE_SIZE); |
fdda387f7 [DLM] Add support... |
591 |
} |
6ed7257b4 [DLM] Consolidate... |
592 593 594 595 |
/* Only SCTP needs these really */ memset(&incmsg, 0, sizeof(incmsg)); msg.msg_control = incmsg; msg.msg_controllen = sizeof(incmsg); |
fdda387f7 [DLM] Add support... |
596 597 598 599 |
/* * iov[0] is the bit of the circular buffer between the current end * point (cb.base + cb.len) and the end of the buffer. */ |
ac33d0710 [DLM] Clean up lo... |
600 601 |
iov[0].iov_len = con->cb.base - cbuf_data(&con->cb); iov[0].iov_base = page_address(con->rx_page) + cbuf_data(&con->cb); |
89adc934f [DLM] Fix uniniti... |
602 |
iov[1].iov_len = 0; |
58addbffd [PATCH] dlm: use ... |
603 |
nvec = 1; |
fdda387f7 [DLM] Add support... |
604 605 606 607 608 |
/* * 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) */ |
ac33d0710 [DLM] Clean up lo... |
609 610 |
if (cbuf_data(&con->cb) >= con->cb.base) { iov[0].iov_len = PAGE_CACHE_SIZE - cbuf_data(&con->cb); |
fdda387f7 [DLM] Add support... |
611 612 |
iov[1].iov_len = con->cb.base; iov[1].iov_base = page_address(con->rx_page); |
58addbffd [PATCH] dlm: use ... |
613 |
nvec = 2; |
fdda387f7 [DLM] Add support... |
614 615 |
} len = iov[0].iov_len + iov[1].iov_len; |
58addbffd [PATCH] dlm: use ... |
616 |
r = ret = kernel_recvmsg(con->sock, &msg, iov, nvec, len, |
fdda387f7 [DLM] Add support... |
617 |
MSG_DONTWAIT | MSG_NOSIGNAL); |
fdda387f7 [DLM] Add support... |
618 619 |
if (ret <= 0) goto out_close; |
bd44e2b00 [DLM] fix lowcomm... |
620 |
|
6ed7257b4 [DLM] Consolidate... |
621 622 |
/* Process SCTP notifications */ if (msg.msg_flags & MSG_NOTIFICATION) { |
6ed7257b4 [DLM] Consolidate... |
623 624 625 626 |
msg.msg_control = incmsg; msg.msg_controllen = sizeof(incmsg); process_sctp_notification(con, &msg, |
617e82e10 [DLM] lowcomms style |
627 |
page_address(con->rx_page) + con->cb.base); |
6ed7257b4 [DLM] Consolidate... |
628 629 630 631 |
mutex_unlock(&con->sock_mutex); return 0; } BUG_ON(con->nodeid == 0); |
fdda387f7 [DLM] Add support... |
632 633 |
if (ret == len) call_again_soon = 1; |
ac33d0710 [DLM] Clean up lo... |
634 |
cbuf_add(&con->cb, ret); |
fdda387f7 [DLM] Add support... |
635 636 637 638 639 |
ret = dlm_process_incoming_buffer(con->nodeid, page_address(con->rx_page), con->cb.base, con->cb.len, PAGE_CACHE_SIZE); if (ret == -EBADMSG) { |
617e82e10 [DLM] lowcomms style |
640 641 642 643 |
log_print("lowcomms: addr=%p, base=%u, len=%u, " "iov_len=%u, iov_base[0]=%p, read=%d", page_address(con->rx_page), con->cb.base, con->cb.len, len, iov[0].iov_base, r); |
fdda387f7 [DLM] Add support... |
644 645 646 |
} if (ret < 0) goto out_close; |
ac33d0710 [DLM] Clean up lo... |
647 |
cbuf_eat(&con->cb, ret); |
fdda387f7 [DLM] Add support... |
648 |
|
ac33d0710 [DLM] Clean up lo... |
649 |
if (cbuf_empty(&con->cb) && !call_again_soon) { |
fdda387f7 [DLM] Add support... |
650 651 652 |
__free_page(con->rx_page); con->rx_page = NULL; } |
fdda387f7 [DLM] Add support... |
653 654 |
if (call_again_soon) goto out_resched; |
f1f1c1ccf [DLM] Make sock_s... |
655 |
mutex_unlock(&con->sock_mutex); |
ac33d0710 [DLM] Clean up lo... |
656 |
return 0; |
fdda387f7 [DLM] Add support... |
657 |
|
ac33d0710 [DLM] Clean up lo... |
658 |
out_resched: |
1d6e8131c [DLM] Use workque... |
659 660 |
if (!test_and_set_bit(CF_READ_PENDING, &con->flags)) queue_work(recv_workqueue, &con->rwork); |
f1f1c1ccf [DLM] Make sock_s... |
661 |
mutex_unlock(&con->sock_mutex); |
bd44e2b00 [DLM] fix lowcomm... |
662 |
return -EAGAIN; |
fdda387f7 [DLM] Add support... |
663 |
|
ac33d0710 [DLM] Clean up lo... |
664 |
out_close: |
f1f1c1ccf [DLM] Make sock_s... |
665 |
mutex_unlock(&con->sock_mutex); |
9e5f2825a [DLM] More otherc... |
666 |
if (ret != -EAGAIN) { |
ac33d0710 [DLM] Clean up lo... |
667 |
close_connection(con, false); |
fdda387f7 [DLM] Add support... |
668 669 |
/* Reconnect when there is something to send */ } |
a34fbc636 [DLM] fix softloc... |
670 671 672 |
/* Don't return success if we really got EOF */ if (ret == 0) ret = -EAGAIN; |
fdda387f7 [DLM] Add support... |
673 |
|
fdda387f7 [DLM] Add support... |
674 675 676 677 |
return ret; } /* Listening socket is busy, accept a connection */ |
6ed7257b4 [DLM] Consolidate... |
678 |
static int tcp_accept_from_sock(struct connection *con) |
fdda387f7 [DLM] Add support... |
679 680 681 682 683 684 685 |
{ int result; struct sockaddr_storage peeraddr; struct socket *newsock; int len; int nodeid; struct connection *newcon; |
bd44e2b00 [DLM] fix lowcomm... |
686 |
struct connection *addcon; |
fdda387f7 [DLM] Add support... |
687 688 |
memset(&peeraddr, 0, sizeof(peeraddr)); |
6ed7257b4 [DLM] Consolidate... |
689 |
result = sock_create_kern(dlm_local_addr[0]->ss_family, SOCK_STREAM, |
ac33d0710 [DLM] Clean up lo... |
690 |
IPPROTO_TCP, &newsock); |
fdda387f7 [DLM] Add support... |
691 692 |
if (result < 0) return -ENOMEM; |
f1f1c1ccf [DLM] Make sock_s... |
693 |
mutex_lock_nested(&con->sock_mutex, 0); |
fdda387f7 [DLM] Add support... |
694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 |
result = -ENOTCONN; if (con->sock == NULL) goto accept_err; newsock->type = con->sock->type; newsock->ops = con->sock->ops; result = con->sock->ops->accept(con->sock, newsock, O_NONBLOCK); if (result < 0) goto accept_err; /* Get the connected socket's peer */ memset(&peeraddr, 0, sizeof(peeraddr)); if (newsock->ops->getname(newsock, (struct sockaddr *)&peeraddr, &len, 2)) { result = -ECONNABORTED; goto accept_err; } /* Get the new node's NODEID */ make_sockaddr(&peeraddr, 0, &len); if (dlm_addr_to_nodeid(&peeraddr, &nodeid)) { |
bcaadf5c1 dlm: dump address... |
717 |
unsigned char *b=(unsigned char *)&peeraddr; |
617e82e10 [DLM] lowcomms style |
718 |
log_print("connect from non cluster node"); |
bcaadf5c1 dlm: dump address... |
719 720 |
print_hex_dump_bytes("ss: ", DUMP_PREFIX_NONE, b, sizeof(struct sockaddr_storage)); |
fdda387f7 [DLM] Add support... |
721 |
sock_release(newsock); |
f1f1c1ccf [DLM] Make sock_s... |
722 |
mutex_unlock(&con->sock_mutex); |
fdda387f7 [DLM] Add support... |
723 724 725 726 727 728 729 730 |
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. |
fdda387f7 [DLM] Add support... |
731 732 |
* In this case we store the incoming one in "othercon" */ |
748285ccf dlm: use more NOF... |
733 |
newcon = nodeid2con(nodeid, GFP_NOFS); |
fdda387f7 [DLM] Add support... |
734 735 736 737 |
if (!newcon) { result = -ENOMEM; goto accept_err; } |
f1f1c1ccf [DLM] Make sock_s... |
738 |
mutex_lock_nested(&newcon->sock_mutex, 1); |
fdda387f7 [DLM] Add support... |
739 |
if (newcon->sock) { |
ac33d0710 [DLM] Clean up lo... |
740 |
struct connection *othercon = newcon->othercon; |
fdda387f7 [DLM] Add support... |
741 742 |
if (!othercon) { |
748285ccf dlm: use more NOF... |
743 |
othercon = kmem_cache_zalloc(con_cache, GFP_NOFS); |
fdda387f7 [DLM] Add support... |
744 |
if (!othercon) { |
617e82e10 [DLM] lowcomms style |
745 |
log_print("failed to allocate incoming socket"); |
f1f1c1ccf [DLM] Make sock_s... |
746 |
mutex_unlock(&newcon->sock_mutex); |
fdda387f7 [DLM] Add support... |
747 748 749 |
result = -ENOMEM; goto accept_err; } |
fdda387f7 [DLM] Add support... |
750 751 |
othercon->nodeid = nodeid; othercon->rx_action = receive_from_sock; |
f1f1c1ccf [DLM] Make sock_s... |
752 |
mutex_init(&othercon->sock_mutex); |
1d6e8131c [DLM] Use workque... |
753 754 |
INIT_WORK(&othercon->swork, process_send_sockets); INIT_WORK(&othercon->rwork, process_recv_sockets); |
fdda387f7 [DLM] Add support... |
755 |
set_bit(CF_IS_OTHERCON, &othercon->flags); |
61d96be0f [DLM] Fix lowcomm... |
756 757 |
} if (!othercon->sock) { |
fdda387f7 [DLM] Add support... |
758 |
newcon->othercon = othercon; |
97d848365 [DLM] Telnet to p... |
759 760 761 762 763 764 765 766 767 |
othercon->sock = newsock; newsock->sk->sk_user_data = othercon; add_sock(newsock, othercon); addcon = othercon; } else { printk("Extra connection from node %d attempted ", nodeid); result = -EAGAIN; |
f4fadb23c [GFS2] git-gfs2-n... |
768 |
mutex_unlock(&newcon->sock_mutex); |
97d848365 [DLM] Telnet to p... |
769 |
goto accept_err; |
fdda387f7 [DLM] Add support... |
770 |
} |
fdda387f7 [DLM] Add support... |
771 772 773 774 775 |
} else { newsock->sk->sk_user_data = newcon; newcon->rx_action = receive_from_sock; add_sock(newsock, newcon); |
bd44e2b00 [DLM] fix lowcomm... |
776 |
addcon = newcon; |
fdda387f7 [DLM] Add support... |
777 |
} |
f1f1c1ccf [DLM] Make sock_s... |
778 |
mutex_unlock(&newcon->sock_mutex); |
fdda387f7 [DLM] Add support... |
779 780 781 |
/* * Add it to the active queue in case we got data |
25985edce Fix common misspe... |
782 |
* between processing the accept adding the socket |
fdda387f7 [DLM] Add support... |
783 784 |
* to the read_sockets list */ |
bd44e2b00 [DLM] fix lowcomm... |
785 786 |
if (!test_and_set_bit(CF_READ_PENDING, &addcon->flags)) queue_work(recv_workqueue, &addcon->rwork); |
f1f1c1ccf [DLM] Make sock_s... |
787 |
mutex_unlock(&con->sock_mutex); |
fdda387f7 [DLM] Add support... |
788 789 |
return 0; |
ac33d0710 [DLM] Clean up lo... |
790 |
accept_err: |
f1f1c1ccf [DLM] Make sock_s... |
791 |
mutex_unlock(&con->sock_mutex); |
fdda387f7 [DLM] Add support... |
792 793 794 |
sock_release(newsock); if (result != -EAGAIN) |
617e82e10 [DLM] lowcomms style |
795 |
log_print("error accepting connection from node: %d", result); |
fdda387f7 [DLM] Add support... |
796 797 |
return result; } |
6ed7257b4 [DLM] Consolidate... |
798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 |
static void free_entry(struct writequeue_entry *e) { __free_page(e->page); kfree(e); } /* Initiate an SCTP association. This is a special case of send_to_sock() in that we don't yet have a peeled-off socket for this association, so we use the listening socket and add the primary IP address of the remote node. */ static void sctp_init_assoc(struct connection *con) { struct sockaddr_storage rem_addr; char outcmsg[CMSG_SPACE(sizeof(struct sctp_sndrcvinfo))]; struct msghdr outmessage; struct cmsghdr *cmsg; struct sctp_sndrcvinfo *sinfo; struct connection *base_con; struct writequeue_entry *e; int len, offset; int ret; int addrlen; struct kvec iov[1]; if (test_and_set_bit(CF_INIT_PENDING, &con->flags)) return; if (con->retries++ > MAX_CONNECT_RETRIES) return; |
6ed7257b4 [DLM] Consolidate... |
828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 |
if (nodeid_to_addr(con->nodeid, (struct sockaddr *)&rem_addr)) { log_print("no address for nodeid %d", con->nodeid); return; } base_con = nodeid2con(0, 0); BUG_ON(base_con == NULL); make_sockaddr(&rem_addr, dlm_config.ci_tcp_port, &addrlen); outmessage.msg_name = &rem_addr; outmessage.msg_namelen = addrlen; outmessage.msg_control = outcmsg; outmessage.msg_controllen = sizeof(outcmsg); outmessage.msg_flags = MSG_EOR; spin_lock(&con->writequeue_lock); |
6ed7257b4 [DLM] Consolidate... |
844 |
|
04bedd79a dlm: fix lowcomms... |
845 846 847 848 849 |
if (list_empty(&con->writequeue)) { spin_unlock(&con->writequeue_lock); log_print("writequeue empty for nodeid %d", con->nodeid); return; } |
6ed7257b4 [DLM] Consolidate... |
850 |
|
04bedd79a dlm: fix lowcomms... |
851 |
e = list_first_entry(&con->writequeue, struct writequeue_entry, list); |
6ed7257b4 [DLM] Consolidate... |
852 853 854 |
len = e->len; offset = e->offset; spin_unlock(&con->writequeue_lock); |
6ed7257b4 [DLM] Consolidate... |
855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 |
/* Send the first block off the write queue */ iov[0].iov_base = page_address(e->page)+offset; iov[0].iov_len = len; cmsg = CMSG_FIRSTHDR(&outmessage); cmsg->cmsg_level = IPPROTO_SCTP; cmsg->cmsg_type = SCTP_SNDRCV; cmsg->cmsg_len = CMSG_LEN(sizeof(struct sctp_sndrcvinfo)); sinfo = CMSG_DATA(cmsg); memset(sinfo, 0x00, sizeof(struct sctp_sndrcvinfo)); sinfo->sinfo_ppid = cpu_to_le32(dlm_our_nodeid()); outmessage.msg_controllen = cmsg->cmsg_len; ret = kernel_sendmsg(base_con->sock, &outmessage, iov, 1, len); if (ret < 0) { |
617e82e10 [DLM] lowcomms style |
871 872 |
log_print("Send first packet to node %d failed: %d", con->nodeid, ret); |
6ed7257b4 [DLM] Consolidate... |
873 874 875 876 877 878 879 880 881 882 883 884 |
/* Try again later */ clear_bit(CF_CONNECT_PENDING, &con->flags); clear_bit(CF_INIT_PENDING, &con->flags); } else { spin_lock(&con->writequeue_lock); e->offset += ret; e->len -= ret; if (e->len == 0 && e->users == 0) { list_del(&e->list); |
6ed7257b4 [DLM] Consolidate... |
885 886 887 888 889 |
free_entry(e); } spin_unlock(&con->writequeue_lock); } } |
fdda387f7 [DLM] Add support... |
890 |
/* Connect a new socket to its peer */ |
6ed7257b4 [DLM] Consolidate... |
891 |
static void tcp_connect_to_sock(struct connection *con) |
fdda387f7 [DLM] Add support... |
892 893 |
{ int result = -EHOSTUNREACH; |
6bd8fedaa dlm: bind connect... |
894 |
struct sockaddr_storage saddr, src_addr; |
fdda387f7 [DLM] Add support... |
895 |
int addr_len; |
a89d63a15 dlm: free socket ... |
896 |
struct socket *sock = NULL; |
cb2d45da8 dlm: use TCP_NODELAY |
897 |
int one = 1; |
fdda387f7 [DLM] Add support... |
898 899 900 |
if (con->nodeid == 0) { log_print("attempt to connect sock 0 foiled"); |
ac33d0710 [DLM] Clean up lo... |
901 |
return; |
fdda387f7 [DLM] Add support... |
902 |
} |
f1f1c1ccf [DLM] Make sock_s... |
903 |
mutex_lock(&con->sock_mutex); |
fdda387f7 [DLM] Add support... |
904 905 906 907 908 909 910 911 912 913 |
if (con->retries++ > MAX_CONNECT_RETRIES) goto out; /* Some odd races can cause double-connects, ignore them */ if (con->sock) { result = 0; goto out; } /* Create a socket to communicate with */ |
6ed7257b4 [DLM] Consolidate... |
914 |
result = sock_create_kern(dlm_local_addr[0]->ss_family, SOCK_STREAM, |
ac33d0710 [DLM] Clean up lo... |
915 |
IPPROTO_TCP, &sock); |
fdda387f7 [DLM] Add support... |
916 917 918 919 |
if (result < 0) goto out_err; memset(&saddr, 0, sizeof(saddr)); |
b5711b8e5 dlm: fix double-r... |
920 |
if (dlm_nodeid_to_addr(con->nodeid, &saddr)) |
ac33d0710 [DLM] Clean up lo... |
921 |
goto out_err; |
fdda387f7 [DLM] Add support... |
922 923 924 |
sock->sk->sk_user_data = con; con->rx_action = receive_from_sock; |
6ed7257b4 [DLM] Consolidate... |
925 926 |
con->connect_action = tcp_connect_to_sock; add_sock(sock, con); |
fdda387f7 [DLM] Add support... |
927 |
|
6bd8fedaa dlm: bind connect... |
928 929 930 931 932 933 934 935 936 937 |
/* 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) { log_print("could not bind for connect: %d", result); /* This *may* not indicate a critical error */ } |
68c817a1c [DLM] rename dlm_... |
938 |
make_sockaddr(&saddr, dlm_config.ci_tcp_port, &addr_len); |
fdda387f7 [DLM] Add support... |
939 |
|
fdda387f7 [DLM] Add support... |
940 |
log_print("connecting to %d", con->nodeid); |
cb2d45da8 dlm: use TCP_NODELAY |
941 942 943 944 |
/* Turn off Nagle's algorithm */ kernel_setsockopt(sock, SOL_TCP, TCP_NODELAY, (char *)&one, sizeof(one)); |
fdda387f7 [DLM] Add support... |
945 946 |
result = sock->ops->connect(sock, (struct sockaddr *)&saddr, addr_len, |
ac33d0710 [DLM] Clean up lo... |
947 |
O_NONBLOCK); |
fdda387f7 [DLM] Add support... |
948 949 |
if (result == -EINPROGRESS) result = 0; |
ac33d0710 [DLM] Clean up lo... |
950 951 |
if (result == 0) goto out; |
fdda387f7 [DLM] Add support... |
952 |
|
ac33d0710 [DLM] Clean up lo... |
953 |
out_err: |
fdda387f7 [DLM] Add support... |
954 955 956 |
if (con->sock) { sock_release(con->sock); con->sock = NULL; |
a89d63a15 dlm: free socket ... |
957 958 |
} else if (sock) { sock_release(sock); |
fdda387f7 [DLM] Add support... |
959 960 961 962 963 964 |
} /* * 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 && |
0035a4b14 dlm: tcp_connect_... |
965 |
result != -ENETDOWN && result != -EINVAL |
fdda387f7 [DLM] Add support... |
966 967 968 969 |
&& result != -EPROTONOSUPPORT) { lowcomms_connect_sock(con); result = 0; } |
ac33d0710 [DLM] Clean up lo... |
970 |
out: |
f1f1c1ccf [DLM] Make sock_s... |
971 |
mutex_unlock(&con->sock_mutex); |
ac33d0710 [DLM] Clean up lo... |
972 |
return; |
fdda387f7 [DLM] Add support... |
973 |
} |
6ed7257b4 [DLM] Consolidate... |
974 975 |
static struct socket *tcp_create_listen_sock(struct connection *con, struct sockaddr_storage *saddr) |
fdda387f7 [DLM] Add support... |
976 |
{ |
ac33d0710 [DLM] Clean up lo... |
977 |
struct socket *sock = NULL; |
fdda387f7 [DLM] Add support... |
978 979 980 |
int result = 0; int one = 1; int addr_len; |
6ed7257b4 [DLM] Consolidate... |
981 |
if (dlm_local_addr[0]->ss_family == AF_INET) |
fdda387f7 [DLM] Add support... |
982 983 984 985 986 |
addr_len = sizeof(struct sockaddr_in); else addr_len = sizeof(struct sockaddr_in6); /* Create a socket to communicate with */ |
617e82e10 [DLM] lowcomms style |
987 988 |
result = sock_create_kern(dlm_local_addr[0]->ss_family, SOCK_STREAM, IPPROTO_TCP, &sock); |
fdda387f7 [DLM] Add support... |
989 |
if (result < 0) { |
617e82e10 [DLM] lowcomms style |
990 |
log_print("Can't create listening comms socket"); |
fdda387f7 [DLM] Add support... |
991 992 |
goto create_out; } |
cb2d45da8 dlm: use TCP_NODELAY |
993 994 995 |
/* Turn off Nagle's algorithm */ kernel_setsockopt(sock, SOL_TCP, TCP_NODELAY, (char *)&one, sizeof(one)); |
6ed7257b4 [DLM] Consolidate... |
996 997 |
result = kernel_setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (char *)&one, sizeof(one)); |
fdda387f7 [DLM] Add support... |
998 |
if (result < 0) { |
617e82e10 [DLM] lowcomms style |
999 |
log_print("Failed to set SO_REUSEADDR on socket: %d", result); |
fdda387f7 [DLM] Add support... |
1000 1001 |
} sock->sk->sk_user_data = con; |
6ed7257b4 [DLM] Consolidate... |
1002 1003 |
con->rx_action = tcp_accept_from_sock; con->connect_action = tcp_connect_to_sock; |
fdda387f7 [DLM] Add support... |
1004 1005 1006 |
con->sock = sock; /* Bind to our port */ |
68c817a1c [DLM] rename dlm_... |
1007 |
make_sockaddr(saddr, dlm_config.ci_tcp_port, &addr_len); |
fdda387f7 [DLM] Add support... |
1008 1009 |
result = sock->ops->bind(sock, (struct sockaddr *) saddr, addr_len); if (result < 0) { |
617e82e10 [DLM] lowcomms style |
1010 |
log_print("Can't bind to port %d", dlm_config.ci_tcp_port); |
fdda387f7 [DLM] Add support... |
1011 1012 1013 1014 1015 |
sock_release(sock); sock = NULL; con->sock = NULL; goto create_out; } |
6ed7257b4 [DLM] Consolidate... |
1016 |
result = kernel_setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE, |
ac33d0710 [DLM] Clean up lo... |
1017 |
(char *)&one, sizeof(one)); |
fdda387f7 [DLM] Add support... |
1018 |
if (result < 0) { |
617e82e10 [DLM] lowcomms style |
1019 |
log_print("Set keepalive failed: %d", result); |
fdda387f7 [DLM] Add support... |
1020 1021 1022 1023 |
} result = sock->ops->listen(sock, 5); if (result < 0) { |
617e82e10 [DLM] lowcomms style |
1024 |
log_print("Can't listen on port %d", dlm_config.ci_tcp_port); |
fdda387f7 [DLM] Add support... |
1025 1026 1027 1028 |
sock_release(sock); sock = NULL; goto create_out; } |
ac33d0710 [DLM] Clean up lo... |
1029 |
create_out: |
fdda387f7 [DLM] Add support... |
1030 1031 |
return sock; } |
6ed7257b4 [DLM] Consolidate... |
1032 1033 1034 1035 1036 |
/* Get local addresses */ static void init_local(void) { struct sockaddr_storage sas, *addr; int i; |
30d3a2373 [DLM] Lowcomms no... |
1037 |
dlm_local_count = 0; |
6ed7257b4 [DLM] Consolidate... |
1038 1039 1040 |
for (i = 0; i < DLM_MAX_ADDR_COUNT - 1; i++) { if (dlm_our_addr(&sas, i)) break; |
573c24c4a dlm: always use G... |
1041 |
addr = kmalloc(sizeof(*addr), GFP_NOFS); |
6ed7257b4 [DLM] Consolidate... |
1042 1043 1044 1045 1046 1047 |
if (!addr) break; memcpy(addr, &sas, sizeof(*addr)); dlm_local_addr[dlm_local_count++] = addr; } } |
617e82e10 [DLM] lowcomms style |
1048 1049 1050 1051 1052 |
/* Bind to an IP address. SCTP allows multiple address so it can do multi-homing */ static int add_sctp_bind_addr(struct connection *sctp_con, struct sockaddr_storage *addr, int addr_len, int num) |
6ed7257b4 [DLM] Consolidate... |
1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 |
{ int result = 0; if (num == 1) result = kernel_bind(sctp_con->sock, (struct sockaddr *) addr, addr_len); else result = kernel_setsockopt(sctp_con->sock, SOL_SCTP, SCTP_SOCKOPT_BINDX_ADD, (char *)addr, addr_len); if (result < 0) log_print("Can't bind to port %d addr number %d", dlm_config.ci_tcp_port, num); return result; } |
fdda387f7 [DLM] Add support... |
1071 |
|
6ed7257b4 [DLM] Consolidate... |
1072 1073 1074 1075 1076 1077 1078 |
/* Initialise SCTP socket and bind to all interfaces */ static int sctp_listen_for_all(void) { struct socket *sock = NULL; struct sockaddr_storage localaddr; struct sctp_event_subscribe subscribe; int result = -EINVAL, num = 1, i, addr_len; |
573c24c4a dlm: always use G... |
1079 |
struct connection *con = nodeid2con(0, GFP_NOFS); |
6ed7257b4 [DLM] Consolidate... |
1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 |
int bufsize = NEEDED_RMEM; if (!con) return -ENOMEM; log_print("Using SCTP for communications"); result = sock_create_kern(dlm_local_addr[0]->ss_family, SOCK_SEQPACKET, IPPROTO_SCTP, &sock); if (result < 0) { log_print("Can't create comms socket, check SCTP is loaded"); goto out; } /* Listen for events */ memset(&subscribe, 0, sizeof(subscribe)); subscribe.sctp_data_io_event = 1; subscribe.sctp_association_event = 1; subscribe.sctp_send_failure_event = 1; subscribe.sctp_shutdown_event = 1; subscribe.sctp_partial_delivery_event = 1; |
df61c9526 [DLM] lowcomms: D... |
1101 |
result = kernel_setsockopt(sock, SOL_SOCKET, SO_RCVBUFFORCE, |
6ed7257b4 [DLM] Consolidate... |
1102 1103 |
(char *)&bufsize, sizeof(bufsize)); if (result) |
617e82e10 [DLM] lowcomms style |
1104 |
log_print("Error increasing buffer space on socket %d", result); |
6ed7257b4 [DLM] Consolidate... |
1105 1106 |
result = kernel_setsockopt(sock, SOL_SCTP, SCTP_EVENTS, |
617e82e10 [DLM] lowcomms style |
1107 |
(char *)&subscribe, sizeof(subscribe)); |
6ed7257b4 [DLM] Consolidate... |
1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 |
if (result < 0) { log_print("Failed to set SCTP_EVENTS on socket: result=%d", result); goto create_delsock; } /* Init con struct */ sock->sk->sk_user_data = con; con->sock = sock; con->sock->sk->sk_data_ready = lowcomms_data_ready; con->rx_action = receive_from_sock; con->connect_action = sctp_init_assoc; /* Bind to all interfaces. */ for (i = 0; i < dlm_local_count; i++) { memcpy(&localaddr, dlm_local_addr[i], sizeof(localaddr)); make_sockaddr(&localaddr, dlm_config.ci_tcp_port, &addr_len); result = add_sctp_bind_addr(con, &localaddr, addr_len, num); if (result) goto create_delsock; ++num; } result = sock->ops->listen(sock, 5); if (result < 0) { log_print("Can't set socket listening"); goto create_delsock; } return 0; create_delsock: sock_release(sock); con->sock = NULL; out: return result; } static int tcp_listen_for_all(void) |
fdda387f7 [DLM] Add support... |
1148 1149 |
{ struct socket *sock = NULL; |
573c24c4a dlm: always use G... |
1150 |
struct connection *con = nodeid2con(0, GFP_NOFS); |
fdda387f7 [DLM] Add support... |
1151 |
int result = -EINVAL; |
6ed7257b4 [DLM] Consolidate... |
1152 1153 |
if (!con) return -ENOMEM; |
fdda387f7 [DLM] Add support... |
1154 |
/* We don't support multi-homed hosts */ |
6ed7257b4 [DLM] Consolidate... |
1155 |
if (dlm_local_addr[1] != NULL) { |
617e82e10 [DLM] lowcomms style |
1156 1157 |
log_print("TCP protocol can't handle multi-homed hosts, " "try SCTP"); |
6ed7257b4 [DLM] Consolidate... |
1158 1159 1160 1161 |
return -EINVAL; } log_print("Using TCP for communications"); |
6ed7257b4 [DLM] Consolidate... |
1162 |
sock = tcp_create_listen_sock(con, dlm_local_addr[0]); |
fdda387f7 [DLM] Add support... |
1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 |
if (sock) { add_sock(sock, con); result = 0; } else { result = -EADDRINUSE; } return result; } static struct writequeue_entry *new_writequeue_entry(struct connection *con, gfp_t allocation) { struct writequeue_entry *entry; entry = kmalloc(sizeof(struct writequeue_entry), allocation); if (!entry) return NULL; entry->page = alloc_page(allocation); if (!entry->page) { kfree(entry); return NULL; } entry->offset = 0; entry->len = 0; entry->end = 0; entry->users = 0; entry->con = con; return entry; } |
617e82e10 [DLM] lowcomms style |
1199 |
void *dlm_lowcomms_get_buffer(int nodeid, int len, gfp_t allocation, char **ppc) |
fdda387f7 [DLM] Add support... |
1200 1201 1202 1203 1204 |
{ struct connection *con; struct writequeue_entry *e; int offset = 0; int users = 0; |
fdda387f7 [DLM] Add support... |
1205 1206 1207 |
con = nodeid2con(nodeid, allocation); if (!con) return NULL; |
4edde74ee [DLM] Fix spin lo... |
1208 |
spin_lock(&con->writequeue_lock); |
fdda387f7 [DLM] Add support... |
1209 |
e = list_entry(con->writequeue.prev, struct writequeue_entry, list); |
ac33d0710 [DLM] Clean up lo... |
1210 |
if ((&e->list == &con->writequeue) || |
fdda387f7 [DLM] Add support... |
1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 |
(PAGE_CACHE_SIZE - e->end < len)) { e = NULL; } else { offset = e->end; e->end += len; users = e->users++; } spin_unlock(&con->writequeue_lock); if (e) { |
ac33d0710 [DLM] Clean up lo... |
1221 |
got_one: |
fdda387f7 [DLM] Add support... |
1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 |
*ppc = page_address(e->page) + offset; return e; } e = new_writequeue_entry(con, allocation); if (e) { spin_lock(&con->writequeue_lock); offset = e->end; e->end += len; users = e->users++; list_add_tail(&e->list, &con->writequeue); spin_unlock(&con->writequeue_lock); goto got_one; } return NULL; } void dlm_lowcomms_commit_buffer(void *mh) { struct writequeue_entry *e = (struct writequeue_entry *)mh; struct connection *con = e->con; int users; |
4edde74ee [DLM] Fix spin lo... |
1244 |
spin_lock(&con->writequeue_lock); |
fdda387f7 [DLM] Add support... |
1245 1246 1247 1248 |
users = --e->users; if (users) goto out; e->len = e->end - e->offset; |
fdda387f7 [DLM] Add support... |
1249 |
spin_unlock(&con->writequeue_lock); |
1d6e8131c [DLM] Use workque... |
1250 1251 |
if (!test_and_set_bit(CF_WRITE_PENDING, &con->flags)) { queue_work(send_workqueue, &con->swork); |
fdda387f7 [DLM] Add support... |
1252 1253 |
} return; |
ac33d0710 [DLM] Clean up lo... |
1254 |
out: |
fdda387f7 [DLM] Add support... |
1255 1256 1257 |
spin_unlock(&con->writequeue_lock); return; } |
fdda387f7 [DLM] Add support... |
1258 |
/* Send a message */ |
ac33d0710 [DLM] Clean up lo... |
1259 |
static void send_to_sock(struct connection *con) |
fdda387f7 [DLM] Add support... |
1260 1261 |
{ int ret = 0; |
fdda387f7 [DLM] Add support... |
1262 1263 1264 |
const int msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL; struct writequeue_entry *e; int len, offset; |
f92c8dd7a dlm: reduce cond_... |
1265 |
int count = 0; |
fdda387f7 [DLM] Add support... |
1266 |
|
f1f1c1ccf [DLM] Make sock_s... |
1267 |
mutex_lock(&con->sock_mutex); |
fdda387f7 [DLM] Add support... |
1268 1269 |
if (con->sock == NULL) goto out_connect; |
fdda387f7 [DLM] Add support... |
1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 |
spin_lock(&con->writequeue_lock); for (;;) { e = list_entry(con->writequeue.next, struct writequeue_entry, list); if ((struct list_head *) e == &con->writequeue) break; len = e->len; offset = e->offset; BUG_ON(len == 0 && e->users == 0); spin_unlock(&con->writequeue_lock); ret = 0; if (len) { |
1329e3f2c dlm: use kernel_s... |
1284 1285 |
ret = kernel_sendpage(con->sock, e->page, offset, len, msg_flags); |
d66f8277f [DLM] Make dlm_se... |
1286 |
if (ret == -EAGAIN || ret == 0) { |
b36930dd5 dlm: Handle appli... |
1287 1288 1289 1290 1291 1292 1293 1294 1295 |
if (ret == -EAGAIN && test_bit(SOCK_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++; } |
d66f8277f [DLM] Make dlm_se... |
1296 |
cond_resched(); |
fdda387f7 [DLM] Add support... |
1297 |
goto out; |
d66f8277f [DLM] Make dlm_se... |
1298 |
} |
fdda387f7 [DLM] Add support... |
1299 1300 |
if (ret <= 0) goto send_error; |
d66f8277f [DLM] Make dlm_se... |
1301 |
} |
f92c8dd7a dlm: reduce cond_... |
1302 1303 1304 |
/* Don't starve people filling buffers */ if (++count >= MAX_SEND_MSG_COUNT) { |
ac33d0710 [DLM] Clean up lo... |
1305 |
cond_resched(); |
f92c8dd7a dlm: reduce cond_... |
1306 1307 |
count = 0; } |
fdda387f7 [DLM] Add support... |
1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 |
spin_lock(&con->writequeue_lock); e->offset += ret; e->len -= ret; if (e->len == 0 && e->users == 0) { list_del(&e->list); free_entry(e); continue; } } spin_unlock(&con->writequeue_lock); |
ac33d0710 [DLM] Clean up lo... |
1320 |
out: |
f1f1c1ccf [DLM] Make sock_s... |
1321 |
mutex_unlock(&con->sock_mutex); |
ac33d0710 [DLM] Clean up lo... |
1322 |
return; |
fdda387f7 [DLM] Add support... |
1323 |
|
ac33d0710 [DLM] Clean up lo... |
1324 |
send_error: |
f1f1c1ccf [DLM] Make sock_s... |
1325 |
mutex_unlock(&con->sock_mutex); |
ac33d0710 [DLM] Clean up lo... |
1326 |
close_connection(con, false); |
fdda387f7 [DLM] Add support... |
1327 |
lowcomms_connect_sock(con); |
ac33d0710 [DLM] Clean up lo... |
1328 |
return; |
fdda387f7 [DLM] Add support... |
1329 |
|
ac33d0710 [DLM] Clean up lo... |
1330 |
out_connect: |
f1f1c1ccf [DLM] Make sock_s... |
1331 |
mutex_unlock(&con->sock_mutex); |
6ed7257b4 [DLM] Consolidate... |
1332 1333 |
if (!test_bit(CF_INIT_PENDING, &con->flags)) lowcomms_connect_sock(con); |
ac33d0710 [DLM] Clean up lo... |
1334 |
return; |
fdda387f7 [DLM] Add support... |
1335 1336 1337 1338 |
} static void clean_one_writequeue(struct connection *con) { |
5e9ccc372 dlm: replace idr ... |
1339 |
struct writequeue_entry *e, *safe; |
fdda387f7 [DLM] Add support... |
1340 1341 |
spin_lock(&con->writequeue_lock); |
5e9ccc372 dlm: replace idr ... |
1342 |
list_for_each_entry_safe(e, safe, &con->writequeue, list) { |
fdda387f7 [DLM] Add support... |
1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 |
list_del(&e->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; |
fdda387f7 [DLM] Add support... |
1354 1355 1356 |
log_print("closing connection to node %d", nodeid); con = nodeid2con(nodeid, 0); if (con) { |
063c4c996 dlm: fix connecti... |
1357 1358 1359 1360 1361 1362 1363 |
clear_bit(CF_CONNECT_PENDING, &con->flags); clear_bit(CF_WRITE_PENDING, &con->flags); set_bit(CF_CLOSE, &con->flags); if (cancel_work_sync(&con->swork)) log_print("canceled swork for node %d", nodeid); if (cancel_work_sync(&con->rwork)) log_print("canceled rwork for node %d", nodeid); |
fdda387f7 [DLM] Add support... |
1364 |
clean_one_writequeue(con); |
ac33d0710 [DLM] Clean up lo... |
1365 |
close_connection(con, true); |
fdda387f7 [DLM] Add support... |
1366 1367 |
} return 0; |
fdda387f7 [DLM] Add support... |
1368 |
} |
6ed7257b4 [DLM] Consolidate... |
1369 |
/* Receive workqueue function */ |
1d6e8131c [DLM] Use workque... |
1370 |
static void process_recv_sockets(struct work_struct *work) |
fdda387f7 [DLM] Add support... |
1371 |
{ |
1d6e8131c [DLM] Use workque... |
1372 1373 |
struct connection *con = container_of(work, struct connection, rwork); int err; |
fdda387f7 [DLM] Add support... |
1374 |
|
1d6e8131c [DLM] Use workque... |
1375 1376 1377 1378 |
clear_bit(CF_READ_PENDING, &con->flags); do { err = con->rx_action(con); } while (!err); |
fdda387f7 [DLM] Add support... |
1379 |
} |
6ed7257b4 [DLM] Consolidate... |
1380 |
/* Send workqueue function */ |
1d6e8131c [DLM] Use workque... |
1381 |
static void process_send_sockets(struct work_struct *work) |
fdda387f7 [DLM] Add support... |
1382 |
{ |
1d6e8131c [DLM] Use workque... |
1383 |
struct connection *con = container_of(work, struct connection, swork); |
fdda387f7 [DLM] Add support... |
1384 |
|
1d6e8131c [DLM] Use workque... |
1385 |
if (test_and_clear_bit(CF_CONNECT_PENDING, &con->flags)) { |
6ed7257b4 [DLM] Consolidate... |
1386 |
con->connect_action(con); |
063c4c996 dlm: fix connecti... |
1387 |
set_bit(CF_WRITE_PENDING, &con->flags); |
fdda387f7 [DLM] Add support... |
1388 |
} |
063c4c996 dlm: fix connecti... |
1389 1390 |
if (test_and_clear_bit(CF_WRITE_PENDING, &con->flags)) send_to_sock(con); |
fdda387f7 [DLM] Add support... |
1391 1392 1393 1394 1395 1396 |
} /* Discard all entries on the write queues */ static void clean_writequeues(void) { |
5e9ccc372 dlm: replace idr ... |
1397 |
foreach_conn(clean_one_writequeue); |
fdda387f7 [DLM] Add support... |
1398 |
} |
1d6e8131c [DLM] Use workque... |
1399 |
static void work_stop(void) |
fdda387f7 [DLM] Add support... |
1400 |
{ |
1d6e8131c [DLM] Use workque... |
1401 1402 |
destroy_workqueue(recv_workqueue); destroy_workqueue(send_workqueue); |
fdda387f7 [DLM] Add support... |
1403 |
} |
1d6e8131c [DLM] Use workque... |
1404 |
static int work_start(void) |
fdda387f7 [DLM] Add support... |
1405 |
{ |
e43f055a9 dlm: use alloc_wo... |
1406 1407 |
recv_workqueue = alloc_workqueue("dlm_recv", WQ_UNBOUND | WQ_MEM_RECLAIM, 1); |
b9d410527 dlm: sanitize wor... |
1408 1409 1410 |
if (!recv_workqueue) { log_print("can't start dlm_recv"); return -ENOMEM; |
fdda387f7 [DLM] Add support... |
1411 |
} |
fdda387f7 [DLM] Add support... |
1412 |
|
e43f055a9 dlm: use alloc_wo... |
1413 1414 |
send_workqueue = alloc_workqueue("dlm_send", WQ_UNBOUND | WQ_MEM_RECLAIM, 1); |
b9d410527 dlm: sanitize wor... |
1415 1416 |
if (!send_workqueue) { log_print("can't start dlm_send"); |
1d6e8131c [DLM] Use workque... |
1417 |
destroy_workqueue(recv_workqueue); |
b9d410527 dlm: sanitize wor... |
1418 |
return -ENOMEM; |
fdda387f7 [DLM] Add support... |
1419 |
} |
fdda387f7 [DLM] Add support... |
1420 1421 1422 |
return 0; } |
5e9ccc372 dlm: replace idr ... |
1423 |
static void stop_conn(struct connection *con) |
fdda387f7 [DLM] Add support... |
1424 |
{ |
5e9ccc372 dlm: replace idr ... |
1425 |
con->flags |= 0x0F; |
391fbdc5d dlm: connect to n... |
1426 |
if (con->sock && con->sock->sk) |
5e9ccc372 dlm: replace idr ... |
1427 1428 |
con->sock->sk->sk_user_data = NULL; } |
fdda387f7 [DLM] Add support... |
1429 |
|
5e9ccc372 dlm: replace idr ... |
1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 |
static void free_conn(struct connection *con) { close_connection(con, true); if (con->othercon) kmem_cache_free(con_cache, con->othercon); hlist_del(&con->list); kmem_cache_free(con_cache, con); } void dlm_lowcomms_stop(void) { |
ac33d0710 [DLM] Clean up lo... |
1441 |
/* Set all the flags to prevent any |
fdda387f7 [DLM] Add support... |
1442 1443 |
socket activity. */ |
7a936ce71 dlm: convert conn... |
1444 |
mutex_lock(&connections_lock); |
5e9ccc372 dlm: replace idr ... |
1445 |
foreach_conn(stop_conn); |
7a936ce71 dlm: convert conn... |
1446 |
mutex_unlock(&connections_lock); |
ac33d0710 [DLM] Clean up lo... |
1447 |
|
1d6e8131c [DLM] Use workque... |
1448 |
work_stop(); |
6ed7257b4 [DLM] Consolidate... |
1449 |
|
7a936ce71 dlm: convert conn... |
1450 |
mutex_lock(&connections_lock); |
fdda387f7 [DLM] Add support... |
1451 |
clean_writequeues(); |
5e9ccc372 dlm: replace idr ... |
1452 |
foreach_conn(free_conn); |
7a936ce71 dlm: convert conn... |
1453 |
mutex_unlock(&connections_lock); |
fdda387f7 [DLM] Add support... |
1454 1455 |
kmem_cache_destroy(con_cache); } |
fdda387f7 [DLM] Add support... |
1456 1457 |
int dlm_lowcomms_start(void) { |
6ed7257b4 [DLM] Consolidate... |
1458 1459 |
int error = -EINVAL; struct connection *con; |
5e9ccc372 dlm: replace idr ... |
1460 1461 1462 1463 |
int i; for (i = 0; i < CONN_HASH_SIZE; i++) INIT_HLIST_HEAD(&connection_hash[i]); |
fdda387f7 [DLM] Add support... |
1464 |
|
6ed7257b4 [DLM] Consolidate... |
1465 1466 |
init_local(); if (!dlm_local_count) { |
617e82e10 [DLM] lowcomms style |
1467 |
error = -ENOTCONN; |
fdda387f7 [DLM] Add support... |
1468 |
log_print("no local IP address has been set"); |
6ed7257b4 [DLM] Consolidate... |
1469 |
goto out; |
fdda387f7 [DLM] Add support... |
1470 |
} |
6ed7257b4 [DLM] Consolidate... |
1471 |
error = -ENOMEM; |
fdda387f7 [DLM] Add support... |
1472 |
con_cache = kmem_cache_create("dlm_conn", sizeof(struct connection), |
ac33d0710 [DLM] Clean up lo... |
1473 |
__alignof__(struct connection), 0, |
20c2df83d mm: Remove slab d... |
1474 |
NULL); |
fdda387f7 [DLM] Add support... |
1475 |
if (!con_cache) |
6ed7257b4 [DLM] Consolidate... |
1476 |
goto out; |
fdda387f7 [DLM] Add support... |
1477 |
|
fdda387f7 [DLM] Add support... |
1478 |
/* Start listening */ |
6ed7257b4 [DLM] Consolidate... |
1479 1480 1481 1482 |
if (dlm_config.ci_protocol == 0) error = tcp_listen_for_all(); else error = sctp_listen_for_all(); |
fdda387f7 [DLM] Add support... |
1483 1484 |
if (error) goto fail_unlisten; |
1d6e8131c [DLM] Use workque... |
1485 |
error = work_start(); |
fdda387f7 [DLM] Add support... |
1486 1487 |
if (error) goto fail_unlisten; |
fdda387f7 [DLM] Add support... |
1488 |
return 0; |
ac33d0710 [DLM] Clean up lo... |
1489 |
fail_unlisten: |
6ed7257b4 [DLM] Consolidate... |
1490 1491 1492 1493 1494 |
con = nodeid2con(0,0); if (con) { close_connection(con, false); kmem_cache_free(con_cache, con); } |
fdda387f7 [DLM] Add support... |
1495 |
kmem_cache_destroy(con_cache); |
ac33d0710 [DLM] Clean up lo... |
1496 |
out: |
fdda387f7 [DLM] Add support... |
1497 1498 |
return error; } |