12522fe45SThomas Gleixner // SPDX-License-Identifier: GPL-2.0-only 26ed7257bSPatrick Caulfield /****************************************************************************** 36ed7257bSPatrick Caulfield ******************************************************************************* 46ed7257bSPatrick Caulfield ** 56ed7257bSPatrick Caulfield ** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. 65e9ccc37SChristine Caulfield ** Copyright (C) 2004-2009 Red Hat, Inc. All rights reserved. 76ed7257bSPatrick Caulfield ** 86ed7257bSPatrick Caulfield ** 96ed7257bSPatrick Caulfield ******************************************************************************* 106ed7257bSPatrick Caulfield ******************************************************************************/ 116ed7257bSPatrick Caulfield 126ed7257bSPatrick Caulfield /* 136ed7257bSPatrick Caulfield * lowcomms.c 146ed7257bSPatrick Caulfield * 156ed7257bSPatrick Caulfield * This is the "low-level" comms layer. 166ed7257bSPatrick Caulfield * 176ed7257bSPatrick Caulfield * It is responsible for sending/receiving messages 186ed7257bSPatrick Caulfield * from other nodes in the cluster. 196ed7257bSPatrick Caulfield * 206ed7257bSPatrick Caulfield * Cluster nodes are referred to by their nodeids. nodeids are 216ed7257bSPatrick Caulfield * simply 32 bit numbers to the locking module - if they need to 222cf12c0bSJoe Perches * be expanded for the cluster infrastructure then that is its 236ed7257bSPatrick Caulfield * responsibility. It is this layer's 246ed7257bSPatrick Caulfield * responsibility to resolve these into IP address or 256ed7257bSPatrick Caulfield * whatever it needs for inter-node communication. 266ed7257bSPatrick Caulfield * 276ed7257bSPatrick Caulfield * The comms level is two kernel threads that deal mainly with 286ed7257bSPatrick Caulfield * the receiving of messages from other nodes and passing them 296ed7257bSPatrick Caulfield * up to the mid-level comms layer (which understands the 306ed7257bSPatrick Caulfield * message format) for execution by the locking core, and 316ed7257bSPatrick Caulfield * a send thread which does all the setting up of connections 326ed7257bSPatrick Caulfield * to remote nodes and the sending of data. Threads are not allowed 336ed7257bSPatrick Caulfield * to send their own data because it may cause them to wait in times 346ed7257bSPatrick Caulfield * of high load. Also, this way, the sending thread can collect together 356ed7257bSPatrick Caulfield * messages bound for one node and send them in one block. 366ed7257bSPatrick Caulfield * 372cf12c0bSJoe Perches * lowcomms will choose to use either TCP or SCTP as its transport layer 386ed7257bSPatrick Caulfield * depending on the configuration variable 'protocol'. This should be set 396ed7257bSPatrick Caulfield * to 0 (default) for TCP or 1 for SCTP. It should be configured using a 406ed7257bSPatrick Caulfield * cluster-wide mechanism as it must be the same on all nodes of the cluster 416ed7257bSPatrick Caulfield * for the DLM to function. 426ed7257bSPatrick Caulfield * 436ed7257bSPatrick Caulfield */ 446ed7257bSPatrick Caulfield 456ed7257bSPatrick Caulfield #include <asm/ioctls.h> 466ed7257bSPatrick Caulfield #include <net/sock.h> 476ed7257bSPatrick Caulfield #include <net/tcp.h> 486ed7257bSPatrick Caulfield #include <linux/pagemap.h> 496ed7257bSPatrick Caulfield #include <linux/file.h> 507a936ce7SMatthias Kaehlcke #include <linux/mutex.h> 516ed7257bSPatrick Caulfield #include <linux/sctp.h> 525a0e3ad6STejun Heo #include <linux/slab.h> 532f2d76ccSBenjamin Poirier #include <net/sctp/sctp.h> 5444ad532bSJoe Perches #include <net/ipv6.h> 556ed7257bSPatrick Caulfield 566ed7257bSPatrick Caulfield #include "dlm_internal.h" 576ed7257bSPatrick Caulfield #include "lowcomms.h" 586ed7257bSPatrick Caulfield #include "midcomms.h" 596ed7257bSPatrick Caulfield #include "config.h" 606ed7257bSPatrick Caulfield 616ed7257bSPatrick Caulfield #define NEEDED_RMEM (4*1024*1024) 625e9ccc37SChristine Caulfield #define CONN_HASH_SIZE 32 636ed7257bSPatrick Caulfield 64f92c8dd7SBob Peterson /* Number of messages to send before rescheduling */ 65f92c8dd7SBob Peterson #define MAX_SEND_MSG_COUNT 25 66055923bfSAlexander Aring #define DLM_SHUTDOWN_WAIT_TIMEOUT msecs_to_jiffies(10000) 67f92c8dd7SBob Peterson 686ed7257bSPatrick Caulfield struct cbuf { 696ed7257bSPatrick Caulfield unsigned int base; 706ed7257bSPatrick Caulfield unsigned int len; 716ed7257bSPatrick Caulfield unsigned int mask; 726ed7257bSPatrick Caulfield }; 736ed7257bSPatrick Caulfield 746ed7257bSPatrick Caulfield static void cbuf_add(struct cbuf *cb, int n) 756ed7257bSPatrick Caulfield { 766ed7257bSPatrick Caulfield cb->len += n; 776ed7257bSPatrick Caulfield } 786ed7257bSPatrick Caulfield 796ed7257bSPatrick Caulfield static int cbuf_data(struct cbuf *cb) 806ed7257bSPatrick Caulfield { 816ed7257bSPatrick Caulfield return ((cb->base + cb->len) & cb->mask); 826ed7257bSPatrick Caulfield } 836ed7257bSPatrick Caulfield 846ed7257bSPatrick Caulfield static void cbuf_init(struct cbuf *cb, int size) 856ed7257bSPatrick Caulfield { 866ed7257bSPatrick Caulfield cb->base = cb->len = 0; 876ed7257bSPatrick Caulfield cb->mask = size-1; 886ed7257bSPatrick Caulfield } 896ed7257bSPatrick Caulfield 906ed7257bSPatrick Caulfield static void cbuf_eat(struct cbuf *cb, int n) 916ed7257bSPatrick Caulfield { 926ed7257bSPatrick Caulfield cb->len -= n; 936ed7257bSPatrick Caulfield cb->base += n; 946ed7257bSPatrick Caulfield cb->base &= cb->mask; 956ed7257bSPatrick Caulfield } 966ed7257bSPatrick Caulfield 976ed7257bSPatrick Caulfield static bool cbuf_empty(struct cbuf *cb) 986ed7257bSPatrick Caulfield { 996ed7257bSPatrick Caulfield return cb->len == 0; 1006ed7257bSPatrick Caulfield } 1016ed7257bSPatrick Caulfield 1026ed7257bSPatrick Caulfield struct connection { 1036ed7257bSPatrick Caulfield struct socket *sock; /* NULL if not connected */ 1046ed7257bSPatrick Caulfield uint32_t nodeid; /* So we know who we are in the list */ 1056ed7257bSPatrick Caulfield struct mutex sock_mutex; 1066ed7257bSPatrick Caulfield unsigned long flags; 1076ed7257bSPatrick Caulfield #define CF_READ_PENDING 1 1088a4abb08Stsutomu.owa@toshiba.co.jp #define CF_WRITE_PENDING 2 1096ed7257bSPatrick Caulfield #define CF_INIT_PENDING 4 1106ed7257bSPatrick Caulfield #define CF_IS_OTHERCON 5 111063c4c99SLars Marowsky-Bree #define CF_CLOSE 6 112b36930ddSDavid Miller #define CF_APP_LIMITED 7 113b2a66629Stsutomu.owa@toshiba.co.jp #define CF_CLOSING 8 114055923bfSAlexander Aring #define CF_SHUTDOWN 9 1156ed7257bSPatrick Caulfield struct list_head writequeue; /* List of outgoing writequeue_entries */ 1166ed7257bSPatrick Caulfield spinlock_t writequeue_lock; 1176ed7257bSPatrick Caulfield int (*rx_action) (struct connection *); /* What to do when active */ 1186ed7257bSPatrick Caulfield void (*connect_action) (struct connection *); /* What to do to connect */ 119055923bfSAlexander Aring void (*shutdown_action)(struct connection *con); /* What to do to shutdown */ 1206ed7257bSPatrick Caulfield struct page *rx_page; 1216ed7257bSPatrick Caulfield struct cbuf cb; 1226ed7257bSPatrick Caulfield int retries; 1236ed7257bSPatrick Caulfield #define MAX_CONNECT_RETRIES 3 1245e9ccc37SChristine Caulfield struct hlist_node list; 1256ed7257bSPatrick Caulfield struct connection *othercon; 1266ed7257bSPatrick Caulfield struct work_struct rwork; /* Receive workqueue */ 1276ed7257bSPatrick Caulfield struct work_struct swork; /* Send workqueue */ 128055923bfSAlexander Aring wait_queue_head_t shutdown_wait; /* wait for graceful shutdown */ 129a47666ebSAlexander Aring struct rcu_head rcu; 1306ed7257bSPatrick Caulfield }; 1316ed7257bSPatrick Caulfield #define sock2con(x) ((struct connection *)(x)->sk_user_data) 1326ed7257bSPatrick Caulfield 1336ed7257bSPatrick Caulfield /* An entry waiting to be sent */ 1346ed7257bSPatrick Caulfield struct writequeue_entry { 1356ed7257bSPatrick Caulfield struct list_head list; 1366ed7257bSPatrick Caulfield struct page *page; 1376ed7257bSPatrick Caulfield int offset; 1386ed7257bSPatrick Caulfield int len; 1396ed7257bSPatrick Caulfield int end; 1406ed7257bSPatrick Caulfield int users; 1416ed7257bSPatrick Caulfield struct connection *con; 1426ed7257bSPatrick Caulfield }; 1436ed7257bSPatrick Caulfield 14436b71a8bSDavid Teigland struct dlm_node_addr { 14536b71a8bSDavid Teigland struct list_head list; 14636b71a8bSDavid Teigland int nodeid; 14736b71a8bSDavid Teigland int addr_count; 14898e1b60eSMike Christie int curr_addr_index; 14936b71a8bSDavid Teigland struct sockaddr_storage *addr[DLM_MAX_ADDR_COUNT]; 15036b71a8bSDavid Teigland }; 15136b71a8bSDavid Teigland 152cc661fc9SBob Peterson static struct listen_sock_callbacks { 153cc661fc9SBob Peterson void (*sk_error_report)(struct sock *); 154cc661fc9SBob Peterson void (*sk_data_ready)(struct sock *); 155cc661fc9SBob Peterson void (*sk_state_change)(struct sock *); 156cc661fc9SBob Peterson void (*sk_write_space)(struct sock *); 157cc661fc9SBob Peterson } listen_sock; 158cc661fc9SBob Peterson 15936b71a8bSDavid Teigland static LIST_HEAD(dlm_node_addrs); 16036b71a8bSDavid Teigland static DEFINE_SPINLOCK(dlm_node_addrs_spin); 16136b71a8bSDavid Teigland 1626ed7257bSPatrick Caulfield static struct sockaddr_storage *dlm_local_addr[DLM_MAX_ADDR_COUNT]; 1636ed7257bSPatrick Caulfield static int dlm_local_count; 164513ef596SDavid Teigland static int dlm_allow_conn; 1656ed7257bSPatrick Caulfield 1666ed7257bSPatrick Caulfield /* Work queues */ 1676ed7257bSPatrick Caulfield static struct workqueue_struct *recv_workqueue; 1686ed7257bSPatrick Caulfield static struct workqueue_struct *send_workqueue; 1696ed7257bSPatrick Caulfield 1705e9ccc37SChristine Caulfield static struct hlist_head connection_hash[CONN_HASH_SIZE]; 171a47666ebSAlexander Aring static DEFINE_SPINLOCK(connections_lock); 172a47666ebSAlexander Aring DEFINE_STATIC_SRCU(connections_srcu); 1736ed7257bSPatrick Caulfield 1746ed7257bSPatrick Caulfield static void process_recv_sockets(struct work_struct *work); 1756ed7257bSPatrick Caulfield static void process_send_sockets(struct work_struct *work); 1766ed7257bSPatrick Caulfield 1775e9ccc37SChristine Caulfield 1785e9ccc37SChristine Caulfield /* This is deliberately very simple because most clusters have simple 1795e9ccc37SChristine Caulfield sequential nodeids, so we should be able to go straight to a connection 1805e9ccc37SChristine Caulfield struct in the array */ 1815e9ccc37SChristine Caulfield static inline int nodeid_hash(int nodeid) 1825e9ccc37SChristine Caulfield { 1835e9ccc37SChristine Caulfield return nodeid & (CONN_HASH_SIZE-1); 1845e9ccc37SChristine Caulfield } 1855e9ccc37SChristine Caulfield 1865e9ccc37SChristine Caulfield static struct connection *__find_con(int nodeid) 1875e9ccc37SChristine Caulfield { 188a47666ebSAlexander Aring int r, idx; 1895e9ccc37SChristine Caulfield struct connection *con; 1905e9ccc37SChristine Caulfield 1915e9ccc37SChristine Caulfield r = nodeid_hash(nodeid); 1925e9ccc37SChristine Caulfield 193a47666ebSAlexander Aring idx = srcu_read_lock(&connections_srcu); 194a47666ebSAlexander Aring hlist_for_each_entry_rcu(con, &connection_hash[r], list) { 195a47666ebSAlexander Aring if (con->nodeid == nodeid) { 196a47666ebSAlexander Aring srcu_read_unlock(&connections_srcu, idx); 1975e9ccc37SChristine Caulfield return con; 1985e9ccc37SChristine Caulfield } 199a47666ebSAlexander Aring } 200a47666ebSAlexander Aring srcu_read_unlock(&connections_srcu, idx); 201a47666ebSAlexander Aring 2025e9ccc37SChristine Caulfield return NULL; 2035e9ccc37SChristine Caulfield } 2045e9ccc37SChristine Caulfield 2056ed7257bSPatrick Caulfield /* 2066ed7257bSPatrick Caulfield * If 'allocation' is zero then we don't attempt to create a new 2076ed7257bSPatrick Caulfield * connection structure for this node. 2086ed7257bSPatrick Caulfield */ 209a47666ebSAlexander Aring static struct connection *nodeid2con(int nodeid, gfp_t alloc) 2106ed7257bSPatrick Caulfield { 2116ed7257bSPatrick Caulfield struct connection *con = NULL; 2126ed7257bSPatrick Caulfield int r; 2136ed7257bSPatrick Caulfield 2145e9ccc37SChristine Caulfield con = __find_con(nodeid); 2156ed7257bSPatrick Caulfield if (con || !alloc) 2166ed7257bSPatrick Caulfield return con; 2176ed7257bSPatrick Caulfield 218a47666ebSAlexander Aring con = kzalloc(sizeof(*con), alloc); 2196ed7257bSPatrick Caulfield if (!con) 2206ed7257bSPatrick Caulfield return NULL; 2216ed7257bSPatrick Caulfield 2226ed7257bSPatrick Caulfield con->nodeid = nodeid; 2236ed7257bSPatrick Caulfield mutex_init(&con->sock_mutex); 2246ed7257bSPatrick Caulfield INIT_LIST_HEAD(&con->writequeue); 2256ed7257bSPatrick Caulfield spin_lock_init(&con->writequeue_lock); 2266ed7257bSPatrick Caulfield INIT_WORK(&con->swork, process_send_sockets); 2276ed7257bSPatrick Caulfield INIT_WORK(&con->rwork, process_recv_sockets); 228055923bfSAlexander Aring init_waitqueue_head(&con->shutdown_wait); 2296ed7257bSPatrick Caulfield 2306ed7257bSPatrick Caulfield /* Setup action pointers for child sockets */ 2316ed7257bSPatrick Caulfield if (con->nodeid) { 2325e9ccc37SChristine Caulfield struct connection *zerocon = __find_con(0); 2336ed7257bSPatrick Caulfield 2346ed7257bSPatrick Caulfield con->connect_action = zerocon->connect_action; 2356ed7257bSPatrick Caulfield if (!con->rx_action) 2366ed7257bSPatrick Caulfield con->rx_action = zerocon->rx_action; 2376ed7257bSPatrick Caulfield } 2386ed7257bSPatrick Caulfield 239a47666ebSAlexander Aring r = nodeid_hash(nodeid); 240a47666ebSAlexander Aring 241a47666ebSAlexander Aring spin_lock(&connections_lock); 242a47666ebSAlexander Aring hlist_add_head_rcu(&con->list, &connection_hash[r]); 243a47666ebSAlexander Aring spin_unlock(&connections_lock); 244a47666ebSAlexander Aring 2456ed7257bSPatrick Caulfield return con; 2466ed7257bSPatrick Caulfield } 2476ed7257bSPatrick Caulfield 2485e9ccc37SChristine Caulfield /* Loop round all connections */ 2495e9ccc37SChristine Caulfield static void foreach_conn(void (*conn_func)(struct connection *c)) 2505e9ccc37SChristine Caulfield { 251a47666ebSAlexander Aring int i, idx; 2525e9ccc37SChristine Caulfield struct connection *con; 2535e9ccc37SChristine Caulfield 254a47666ebSAlexander Aring idx = srcu_read_lock(&connections_srcu); 2555e9ccc37SChristine Caulfield for (i = 0; i < CONN_HASH_SIZE; i++) { 256a47666ebSAlexander Aring hlist_for_each_entry_rcu(con, &connection_hash[i], list) 2575e9ccc37SChristine Caulfield conn_func(con); 2585e9ccc37SChristine Caulfield } 259a47666ebSAlexander Aring srcu_read_unlock(&connections_srcu, idx); 2606ed7257bSPatrick Caulfield } 2616ed7257bSPatrick Caulfield 26236b71a8bSDavid Teigland static struct dlm_node_addr *find_node_addr(int nodeid) 2636ed7257bSPatrick Caulfield { 26436b71a8bSDavid Teigland struct dlm_node_addr *na; 26536b71a8bSDavid Teigland 26636b71a8bSDavid Teigland list_for_each_entry(na, &dlm_node_addrs, list) { 26736b71a8bSDavid Teigland if (na->nodeid == nodeid) 26836b71a8bSDavid Teigland return na; 26936b71a8bSDavid Teigland } 27036b71a8bSDavid Teigland return NULL; 27136b71a8bSDavid Teigland } 27236b71a8bSDavid Teigland 27336b71a8bSDavid Teigland static int addr_compare(struct sockaddr_storage *x, struct sockaddr_storage *y) 27436b71a8bSDavid Teigland { 27536b71a8bSDavid Teigland switch (x->ss_family) { 27636b71a8bSDavid Teigland case AF_INET: { 27736b71a8bSDavid Teigland struct sockaddr_in *sinx = (struct sockaddr_in *)x; 27836b71a8bSDavid Teigland struct sockaddr_in *siny = (struct sockaddr_in *)y; 27936b71a8bSDavid Teigland if (sinx->sin_addr.s_addr != siny->sin_addr.s_addr) 28036b71a8bSDavid Teigland return 0; 28136b71a8bSDavid Teigland if (sinx->sin_port != siny->sin_port) 28236b71a8bSDavid Teigland return 0; 28336b71a8bSDavid Teigland break; 28436b71a8bSDavid Teigland } 28536b71a8bSDavid Teigland case AF_INET6: { 28636b71a8bSDavid Teigland struct sockaddr_in6 *sinx = (struct sockaddr_in6 *)x; 28736b71a8bSDavid Teigland struct sockaddr_in6 *siny = (struct sockaddr_in6 *)y; 28836b71a8bSDavid Teigland if (!ipv6_addr_equal(&sinx->sin6_addr, &siny->sin6_addr)) 28936b71a8bSDavid Teigland return 0; 29036b71a8bSDavid Teigland if (sinx->sin6_port != siny->sin6_port) 29136b71a8bSDavid Teigland return 0; 29236b71a8bSDavid Teigland break; 29336b71a8bSDavid Teigland } 29436b71a8bSDavid Teigland default: 29536b71a8bSDavid Teigland return 0; 29636b71a8bSDavid Teigland } 29736b71a8bSDavid Teigland return 1; 29836b71a8bSDavid Teigland } 29936b71a8bSDavid Teigland 30036b71a8bSDavid Teigland static int nodeid_to_addr(int nodeid, struct sockaddr_storage *sas_out, 30198e1b60eSMike Christie struct sockaddr *sa_out, bool try_new_addr) 30236b71a8bSDavid Teigland { 30336b71a8bSDavid Teigland struct sockaddr_storage sas; 30436b71a8bSDavid Teigland struct dlm_node_addr *na; 3056ed7257bSPatrick Caulfield 3066ed7257bSPatrick Caulfield if (!dlm_local_count) 3076ed7257bSPatrick Caulfield return -1; 3086ed7257bSPatrick Caulfield 30936b71a8bSDavid Teigland spin_lock(&dlm_node_addrs_spin); 31036b71a8bSDavid Teigland na = find_node_addr(nodeid); 31198e1b60eSMike Christie if (na && na->addr_count) { 312ee44b4bcSMarcelo Ricardo Leitner memcpy(&sas, na->addr[na->curr_addr_index], 313ee44b4bcSMarcelo Ricardo Leitner sizeof(struct sockaddr_storage)); 314ee44b4bcSMarcelo Ricardo Leitner 31598e1b60eSMike Christie if (try_new_addr) { 31698e1b60eSMike Christie na->curr_addr_index++; 31798e1b60eSMike Christie if (na->curr_addr_index == na->addr_count) 31898e1b60eSMike Christie na->curr_addr_index = 0; 31998e1b60eSMike Christie } 32098e1b60eSMike Christie } 32136b71a8bSDavid Teigland spin_unlock(&dlm_node_addrs_spin); 32236b71a8bSDavid Teigland 32336b71a8bSDavid Teigland if (!na) 32436b71a8bSDavid Teigland return -EEXIST; 32536b71a8bSDavid Teigland 32636b71a8bSDavid Teigland if (!na->addr_count) 32736b71a8bSDavid Teigland return -ENOENT; 32836b71a8bSDavid Teigland 32936b71a8bSDavid Teigland if (sas_out) 33036b71a8bSDavid Teigland memcpy(sas_out, &sas, sizeof(struct sockaddr_storage)); 33136b71a8bSDavid Teigland 33236b71a8bSDavid Teigland if (!sa_out) 33336b71a8bSDavid Teigland return 0; 3346ed7257bSPatrick Caulfield 3356ed7257bSPatrick Caulfield if (dlm_local_addr[0]->ss_family == AF_INET) { 33636b71a8bSDavid Teigland struct sockaddr_in *in4 = (struct sockaddr_in *) &sas; 33736b71a8bSDavid Teigland struct sockaddr_in *ret4 = (struct sockaddr_in *) sa_out; 3386ed7257bSPatrick Caulfield ret4->sin_addr.s_addr = in4->sin_addr.s_addr; 3396ed7257bSPatrick Caulfield } else { 34036b71a8bSDavid Teigland struct sockaddr_in6 *in6 = (struct sockaddr_in6 *) &sas; 34136b71a8bSDavid Teigland struct sockaddr_in6 *ret6 = (struct sockaddr_in6 *) sa_out; 3424e3fd7a0SAlexey Dobriyan ret6->sin6_addr = in6->sin6_addr; 3436ed7257bSPatrick Caulfield } 3446ed7257bSPatrick Caulfield 3456ed7257bSPatrick Caulfield return 0; 3466ed7257bSPatrick Caulfield } 3476ed7257bSPatrick Caulfield 34836b71a8bSDavid Teigland static int addr_to_nodeid(struct sockaddr_storage *addr, int *nodeid) 34936b71a8bSDavid Teigland { 35036b71a8bSDavid Teigland struct dlm_node_addr *na; 35136b71a8bSDavid Teigland int rv = -EEXIST; 35298e1b60eSMike Christie int addr_i; 35336b71a8bSDavid Teigland 35436b71a8bSDavid Teigland spin_lock(&dlm_node_addrs_spin); 35536b71a8bSDavid Teigland list_for_each_entry(na, &dlm_node_addrs, list) { 35636b71a8bSDavid Teigland if (!na->addr_count) 35736b71a8bSDavid Teigland continue; 35836b71a8bSDavid Teigland 35998e1b60eSMike Christie for (addr_i = 0; addr_i < na->addr_count; addr_i++) { 36098e1b60eSMike Christie if (addr_compare(na->addr[addr_i], addr)) { 36136b71a8bSDavid Teigland *nodeid = na->nodeid; 36236b71a8bSDavid Teigland rv = 0; 36398e1b60eSMike Christie goto unlock; 36436b71a8bSDavid Teigland } 36598e1b60eSMike Christie } 36698e1b60eSMike Christie } 36798e1b60eSMike Christie unlock: 36836b71a8bSDavid Teigland spin_unlock(&dlm_node_addrs_spin); 36936b71a8bSDavid Teigland return rv; 37036b71a8bSDavid Teigland } 37136b71a8bSDavid Teigland 37236b71a8bSDavid Teigland int dlm_lowcomms_addr(int nodeid, struct sockaddr_storage *addr, int len) 37336b71a8bSDavid Teigland { 37436b71a8bSDavid Teigland struct sockaddr_storage *new_addr; 37536b71a8bSDavid Teigland struct dlm_node_addr *new_node, *na; 37636b71a8bSDavid Teigland 37736b71a8bSDavid Teigland new_node = kzalloc(sizeof(struct dlm_node_addr), GFP_NOFS); 37836b71a8bSDavid Teigland if (!new_node) 37936b71a8bSDavid Teigland return -ENOMEM; 38036b71a8bSDavid Teigland 38136b71a8bSDavid Teigland new_addr = kzalloc(sizeof(struct sockaddr_storage), GFP_NOFS); 38236b71a8bSDavid Teigland if (!new_addr) { 38336b71a8bSDavid Teigland kfree(new_node); 38436b71a8bSDavid Teigland return -ENOMEM; 38536b71a8bSDavid Teigland } 38636b71a8bSDavid Teigland 38736b71a8bSDavid Teigland memcpy(new_addr, addr, len); 38836b71a8bSDavid Teigland 38936b71a8bSDavid Teigland spin_lock(&dlm_node_addrs_spin); 39036b71a8bSDavid Teigland na = find_node_addr(nodeid); 39136b71a8bSDavid Teigland if (!na) { 39236b71a8bSDavid Teigland new_node->nodeid = nodeid; 39336b71a8bSDavid Teigland new_node->addr[0] = new_addr; 39436b71a8bSDavid Teigland new_node->addr_count = 1; 39536b71a8bSDavid Teigland list_add(&new_node->list, &dlm_node_addrs); 39636b71a8bSDavid Teigland spin_unlock(&dlm_node_addrs_spin); 39736b71a8bSDavid Teigland return 0; 39836b71a8bSDavid Teigland } 39936b71a8bSDavid Teigland 40036b71a8bSDavid Teigland if (na->addr_count >= DLM_MAX_ADDR_COUNT) { 40136b71a8bSDavid Teigland spin_unlock(&dlm_node_addrs_spin); 40236b71a8bSDavid Teigland kfree(new_addr); 40336b71a8bSDavid Teigland kfree(new_node); 40436b71a8bSDavid Teigland return -ENOSPC; 40536b71a8bSDavid Teigland } 40636b71a8bSDavid Teigland 40736b71a8bSDavid Teigland na->addr[na->addr_count++] = new_addr; 40836b71a8bSDavid Teigland spin_unlock(&dlm_node_addrs_spin); 40936b71a8bSDavid Teigland kfree(new_node); 41036b71a8bSDavid Teigland return 0; 41136b71a8bSDavid Teigland } 41236b71a8bSDavid Teigland 4136ed7257bSPatrick Caulfield /* Data available on socket or listen socket received a connect */ 414676d2369SDavid S. Miller static void lowcomms_data_ready(struct sock *sk) 4156ed7257bSPatrick Caulfield { 41693eaadebStsutomu.owa@toshiba.co.jp struct connection *con; 41793eaadebStsutomu.owa@toshiba.co.jp 41893eaadebStsutomu.owa@toshiba.co.jp read_lock_bh(&sk->sk_callback_lock); 41993eaadebStsutomu.owa@toshiba.co.jp con = sock2con(sk); 420afb853fbSPatrick Caulfield if (con && !test_and_set_bit(CF_READ_PENDING, &con->flags)) 4216ed7257bSPatrick Caulfield queue_work(recv_workqueue, &con->rwork); 42293eaadebStsutomu.owa@toshiba.co.jp read_unlock_bh(&sk->sk_callback_lock); 4236ed7257bSPatrick Caulfield } 4246ed7257bSPatrick Caulfield 4256ed7257bSPatrick Caulfield static void lowcomms_write_space(struct sock *sk) 4266ed7257bSPatrick Caulfield { 42793eaadebStsutomu.owa@toshiba.co.jp struct connection *con; 4286ed7257bSPatrick Caulfield 42993eaadebStsutomu.owa@toshiba.co.jp read_lock_bh(&sk->sk_callback_lock); 43093eaadebStsutomu.owa@toshiba.co.jp con = sock2con(sk); 431b36930ddSDavid Miller if (!con) 43293eaadebStsutomu.owa@toshiba.co.jp goto out; 433b36930ddSDavid Miller 434b36930ddSDavid Miller clear_bit(SOCK_NOSPACE, &con->sock->flags); 435b36930ddSDavid Miller 436b36930ddSDavid Miller if (test_and_clear_bit(CF_APP_LIMITED, &con->flags)) { 437b36930ddSDavid Miller con->sock->sk->sk_write_pending--; 4389cd3e072SEric Dumazet clear_bit(SOCKWQ_ASYNC_NOSPACE, &con->sock->flags); 439b36930ddSDavid Miller } 440b36930ddSDavid Miller 4416ed7257bSPatrick Caulfield queue_work(send_workqueue, &con->swork); 44293eaadebStsutomu.owa@toshiba.co.jp out: 44393eaadebStsutomu.owa@toshiba.co.jp read_unlock_bh(&sk->sk_callback_lock); 4446ed7257bSPatrick Caulfield } 4456ed7257bSPatrick Caulfield 4466ed7257bSPatrick Caulfield static inline void lowcomms_connect_sock(struct connection *con) 4476ed7257bSPatrick Caulfield { 448063c4c99SLars Marowsky-Bree if (test_bit(CF_CLOSE, &con->flags)) 449063c4c99SLars Marowsky-Bree return; 4506ed7257bSPatrick Caulfield queue_work(send_workqueue, &con->swork); 45161d9102bSBob Peterson cond_resched(); 4526ed7257bSPatrick Caulfield } 4536ed7257bSPatrick Caulfield 4546ed7257bSPatrick Caulfield static void lowcomms_state_change(struct sock *sk) 4556ed7257bSPatrick Caulfield { 456ee44b4bcSMarcelo Ricardo Leitner /* SCTP layer is not calling sk_data_ready when the connection 457ee44b4bcSMarcelo Ricardo Leitner * is done, so we catch the signal through here. Also, it 458ee44b4bcSMarcelo Ricardo Leitner * doesn't switch socket state when entering shutdown, so we 459ee44b4bcSMarcelo Ricardo Leitner * skip the write in that case. 460ee44b4bcSMarcelo Ricardo Leitner */ 461ee44b4bcSMarcelo Ricardo Leitner if (sk->sk_shutdown) { 462ee44b4bcSMarcelo Ricardo Leitner if (sk->sk_shutdown == RCV_SHUTDOWN) 463ee44b4bcSMarcelo Ricardo Leitner lowcomms_data_ready(sk); 464ee44b4bcSMarcelo Ricardo Leitner } else if (sk->sk_state == TCP_ESTABLISHED) { 4656ed7257bSPatrick Caulfield lowcomms_write_space(sk); 4666ed7257bSPatrick Caulfield } 467ee44b4bcSMarcelo Ricardo Leitner } 4686ed7257bSPatrick Caulfield 469391fbdc5SChristine Caulfield int dlm_lowcomms_connect_node(int nodeid) 470391fbdc5SChristine Caulfield { 471391fbdc5SChristine Caulfield struct connection *con; 472391fbdc5SChristine Caulfield 473391fbdc5SChristine Caulfield if (nodeid == dlm_our_nodeid()) 474391fbdc5SChristine Caulfield return 0; 475391fbdc5SChristine Caulfield 476391fbdc5SChristine Caulfield con = nodeid2con(nodeid, GFP_NOFS); 477391fbdc5SChristine Caulfield if (!con) 478391fbdc5SChristine Caulfield return -ENOMEM; 479391fbdc5SChristine Caulfield lowcomms_connect_sock(con); 480391fbdc5SChristine Caulfield return 0; 481391fbdc5SChristine Caulfield } 482391fbdc5SChristine Caulfield 483b3a5bbfdSBob Peterson static void lowcomms_error_report(struct sock *sk) 484b3a5bbfdSBob Peterson { 485b81171cbSBob Peterson struct connection *con; 486b3a5bbfdSBob Peterson struct sockaddr_storage saddr; 487b81171cbSBob Peterson void (*orig_report)(struct sock *) = NULL; 488b3a5bbfdSBob Peterson 489b81171cbSBob Peterson read_lock_bh(&sk->sk_callback_lock); 490b81171cbSBob Peterson con = sock2con(sk); 491b81171cbSBob Peterson if (con == NULL) 492b81171cbSBob Peterson goto out; 493b81171cbSBob Peterson 494cc661fc9SBob Peterson orig_report = listen_sock.sk_error_report; 4951a31833dSBob Peterson if (con->sock == NULL || 4969b2c45d4SDenys Vlasenko kernel_getpeername(con->sock, (struct sockaddr *)&saddr) < 0) { 497b3a5bbfdSBob Peterson printk_ratelimited(KERN_ERR "dlm: node %d: socket error " 498b3a5bbfdSBob Peterson "sending to node %d, port %d, " 499b3a5bbfdSBob Peterson "sk_err=%d/%d\n", dlm_our_nodeid(), 500b3a5bbfdSBob Peterson con->nodeid, dlm_config.ci_tcp_port, 501b3a5bbfdSBob Peterson sk->sk_err, sk->sk_err_soft); 502b3a5bbfdSBob Peterson } else if (saddr.ss_family == AF_INET) { 503b3a5bbfdSBob Peterson struct sockaddr_in *sin4 = (struct sockaddr_in *)&saddr; 504b3a5bbfdSBob Peterson 505b3a5bbfdSBob Peterson printk_ratelimited(KERN_ERR "dlm: node %d: socket error " 506b3a5bbfdSBob Peterson "sending to node %d at %pI4, port %d, " 507b3a5bbfdSBob Peterson "sk_err=%d/%d\n", dlm_our_nodeid(), 508b3a5bbfdSBob Peterson con->nodeid, &sin4->sin_addr.s_addr, 509b3a5bbfdSBob Peterson dlm_config.ci_tcp_port, sk->sk_err, 510b3a5bbfdSBob Peterson sk->sk_err_soft); 511b3a5bbfdSBob Peterson } else { 512b3a5bbfdSBob Peterson struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&saddr; 513b3a5bbfdSBob Peterson 514b3a5bbfdSBob Peterson printk_ratelimited(KERN_ERR "dlm: node %d: socket error " 515b3a5bbfdSBob Peterson "sending to node %d at %u.%u.%u.%u, " 516b3a5bbfdSBob Peterson "port %d, sk_err=%d/%d\n", dlm_our_nodeid(), 517b3a5bbfdSBob Peterson con->nodeid, sin6->sin6_addr.s6_addr32[0], 518b3a5bbfdSBob Peterson sin6->sin6_addr.s6_addr32[1], 519b3a5bbfdSBob Peterson sin6->sin6_addr.s6_addr32[2], 520b3a5bbfdSBob Peterson sin6->sin6_addr.s6_addr32[3], 521b3a5bbfdSBob Peterson dlm_config.ci_tcp_port, sk->sk_err, 522b3a5bbfdSBob Peterson sk->sk_err_soft); 523b3a5bbfdSBob Peterson } 524b81171cbSBob Peterson out: 525b81171cbSBob Peterson read_unlock_bh(&sk->sk_callback_lock); 526b81171cbSBob Peterson if (orig_report) 527b81171cbSBob Peterson orig_report(sk); 528b81171cbSBob Peterson } 529b81171cbSBob Peterson 530b81171cbSBob Peterson /* Note: sk_callback_lock must be locked before calling this function. */ 531cc661fc9SBob Peterson static void save_listen_callbacks(struct socket *sock) 532b81171cbSBob Peterson { 533cc661fc9SBob Peterson struct sock *sk = sock->sk; 534cc661fc9SBob Peterson 535cc661fc9SBob Peterson listen_sock.sk_data_ready = sk->sk_data_ready; 536cc661fc9SBob Peterson listen_sock.sk_state_change = sk->sk_state_change; 537cc661fc9SBob Peterson listen_sock.sk_write_space = sk->sk_write_space; 538cc661fc9SBob Peterson listen_sock.sk_error_report = sk->sk_error_report; 539b81171cbSBob Peterson } 540b81171cbSBob Peterson 541cc661fc9SBob Peterson static void restore_callbacks(struct socket *sock) 542b81171cbSBob Peterson { 543cc661fc9SBob Peterson struct sock *sk = sock->sk; 544cc661fc9SBob Peterson 545b81171cbSBob Peterson write_lock_bh(&sk->sk_callback_lock); 546b81171cbSBob Peterson sk->sk_user_data = NULL; 547cc661fc9SBob Peterson sk->sk_data_ready = listen_sock.sk_data_ready; 548cc661fc9SBob Peterson sk->sk_state_change = listen_sock.sk_state_change; 549cc661fc9SBob Peterson sk->sk_write_space = listen_sock.sk_write_space; 550cc661fc9SBob Peterson sk->sk_error_report = listen_sock.sk_error_report; 551b81171cbSBob Peterson write_unlock_bh(&sk->sk_callback_lock); 552b3a5bbfdSBob Peterson } 553b3a5bbfdSBob Peterson 5546ed7257bSPatrick Caulfield /* Make a socket active */ 555988419a9Stsutomu.owa@toshiba.co.jp static void add_sock(struct socket *sock, struct connection *con) 5566ed7257bSPatrick Caulfield { 557b81171cbSBob Peterson struct sock *sk = sock->sk; 558b81171cbSBob Peterson 559b81171cbSBob Peterson write_lock_bh(&sk->sk_callback_lock); 5606ed7257bSPatrick Caulfield con->sock = sock; 5616ed7257bSPatrick Caulfield 562b81171cbSBob Peterson sk->sk_user_data = con; 5636ed7257bSPatrick Caulfield /* Install a data_ready callback */ 564b81171cbSBob Peterson sk->sk_data_ready = lowcomms_data_ready; 565b81171cbSBob Peterson sk->sk_write_space = lowcomms_write_space; 566b81171cbSBob Peterson sk->sk_state_change = lowcomms_state_change; 567b81171cbSBob Peterson sk->sk_allocation = GFP_NOFS; 568b81171cbSBob Peterson sk->sk_error_report = lowcomms_error_report; 569b81171cbSBob Peterson write_unlock_bh(&sk->sk_callback_lock); 5706ed7257bSPatrick Caulfield } 5716ed7257bSPatrick Caulfield 5726ed7257bSPatrick Caulfield /* Add the port number to an IPv6 or 4 sockaddr and return the address 5736ed7257bSPatrick Caulfield length */ 5746ed7257bSPatrick Caulfield static void make_sockaddr(struct sockaddr_storage *saddr, uint16_t port, 5756ed7257bSPatrick Caulfield int *addr_len) 5766ed7257bSPatrick Caulfield { 5776ed7257bSPatrick Caulfield saddr->ss_family = dlm_local_addr[0]->ss_family; 5786ed7257bSPatrick Caulfield if (saddr->ss_family == AF_INET) { 5796ed7257bSPatrick Caulfield struct sockaddr_in *in4_addr = (struct sockaddr_in *)saddr; 5806ed7257bSPatrick Caulfield in4_addr->sin_port = cpu_to_be16(port); 5816ed7257bSPatrick Caulfield *addr_len = sizeof(struct sockaddr_in); 5826ed7257bSPatrick Caulfield memset(&in4_addr->sin_zero, 0, sizeof(in4_addr->sin_zero)); 5836ed7257bSPatrick Caulfield } else { 5846ed7257bSPatrick Caulfield struct sockaddr_in6 *in6_addr = (struct sockaddr_in6 *)saddr; 5856ed7257bSPatrick Caulfield in6_addr->sin6_port = cpu_to_be16(port); 5866ed7257bSPatrick Caulfield *addr_len = sizeof(struct sockaddr_in6); 5876ed7257bSPatrick Caulfield } 58801c8cab2SPatrick Caulfield memset((char *)saddr + *addr_len, 0, sizeof(struct sockaddr_storage) - *addr_len); 5896ed7257bSPatrick Caulfield } 5906ed7257bSPatrick Caulfield 5916ed7257bSPatrick Caulfield /* Close a remote connection and tidy up */ 5920d737a8cSMarcelo Ricardo Leitner static void close_connection(struct connection *con, bool and_other, 5930d737a8cSMarcelo Ricardo Leitner bool tx, bool rx) 5946ed7257bSPatrick Caulfield { 595b2a66629Stsutomu.owa@toshiba.co.jp bool closing = test_and_set_bit(CF_CLOSING, &con->flags); 596b2a66629Stsutomu.owa@toshiba.co.jp 5970aa18464Stsutomu.owa@toshiba.co.jp if (tx && !closing && cancel_work_sync(&con->swork)) { 5980d737a8cSMarcelo Ricardo Leitner log_print("canceled swork for node %d", con->nodeid); 5990aa18464Stsutomu.owa@toshiba.co.jp clear_bit(CF_WRITE_PENDING, &con->flags); 6000aa18464Stsutomu.owa@toshiba.co.jp } 6010aa18464Stsutomu.owa@toshiba.co.jp if (rx && !closing && cancel_work_sync(&con->rwork)) { 6020d737a8cSMarcelo Ricardo Leitner log_print("canceled rwork for node %d", con->nodeid); 6030aa18464Stsutomu.owa@toshiba.co.jp clear_bit(CF_READ_PENDING, &con->flags); 6040aa18464Stsutomu.owa@toshiba.co.jp } 6056ed7257bSPatrick Caulfield 6060d737a8cSMarcelo Ricardo Leitner mutex_lock(&con->sock_mutex); 6076ed7257bSPatrick Caulfield if (con->sock) { 608cc661fc9SBob Peterson restore_callbacks(con->sock); 6096ed7257bSPatrick Caulfield sock_release(con->sock); 6106ed7257bSPatrick Caulfield con->sock = NULL; 6116ed7257bSPatrick Caulfield } 6126ed7257bSPatrick Caulfield if (con->othercon && and_other) { 6136ed7257bSPatrick Caulfield /* Will only re-enter once. */ 6140d737a8cSMarcelo Ricardo Leitner close_connection(con->othercon, false, true, true); 6156ed7257bSPatrick Caulfield } 6166ed7257bSPatrick Caulfield if (con->rx_page) { 6176ed7257bSPatrick Caulfield __free_page(con->rx_page); 6186ed7257bSPatrick Caulfield con->rx_page = NULL; 6196ed7257bSPatrick Caulfield } 6209e5f2825SPatrick Caulfield 6216ed7257bSPatrick Caulfield con->retries = 0; 6226ed7257bSPatrick Caulfield mutex_unlock(&con->sock_mutex); 623b2a66629Stsutomu.owa@toshiba.co.jp clear_bit(CF_CLOSING, &con->flags); 6246ed7257bSPatrick Caulfield } 6256ed7257bSPatrick Caulfield 626055923bfSAlexander Aring static void shutdown_connection(struct connection *con) 627055923bfSAlexander Aring { 628055923bfSAlexander Aring int ret; 629055923bfSAlexander Aring 630055923bfSAlexander Aring if (cancel_work_sync(&con->swork)) { 631055923bfSAlexander Aring log_print("canceled swork for node %d", con->nodeid); 632055923bfSAlexander Aring clear_bit(CF_WRITE_PENDING, &con->flags); 633055923bfSAlexander Aring } 634055923bfSAlexander Aring 635055923bfSAlexander Aring mutex_lock(&con->sock_mutex); 636055923bfSAlexander Aring /* nothing to shutdown */ 637055923bfSAlexander Aring if (!con->sock) { 638055923bfSAlexander Aring mutex_unlock(&con->sock_mutex); 639055923bfSAlexander Aring return; 640055923bfSAlexander Aring } 641055923bfSAlexander Aring 642055923bfSAlexander Aring set_bit(CF_SHUTDOWN, &con->flags); 643055923bfSAlexander Aring ret = kernel_sock_shutdown(con->sock, SHUT_WR); 644055923bfSAlexander Aring mutex_unlock(&con->sock_mutex); 645055923bfSAlexander Aring if (ret) { 646055923bfSAlexander Aring log_print("Connection %p failed to shutdown: %d will force close", 647055923bfSAlexander Aring con, ret); 648055923bfSAlexander Aring goto force_close; 649055923bfSAlexander Aring } else { 650055923bfSAlexander Aring ret = wait_event_timeout(con->shutdown_wait, 651055923bfSAlexander Aring !test_bit(CF_SHUTDOWN, &con->flags), 652055923bfSAlexander Aring DLM_SHUTDOWN_WAIT_TIMEOUT); 653055923bfSAlexander Aring if (ret == 0) { 654055923bfSAlexander Aring log_print("Connection %p shutdown timed out, will force close", 655055923bfSAlexander Aring con); 656055923bfSAlexander Aring goto force_close; 657055923bfSAlexander Aring } 658055923bfSAlexander Aring } 659055923bfSAlexander Aring 660055923bfSAlexander Aring return; 661055923bfSAlexander Aring 662055923bfSAlexander Aring force_close: 663055923bfSAlexander Aring clear_bit(CF_SHUTDOWN, &con->flags); 664055923bfSAlexander Aring close_connection(con, false, true, true); 665055923bfSAlexander Aring } 666055923bfSAlexander Aring 667055923bfSAlexander Aring static void dlm_tcp_shutdown(struct connection *con) 668055923bfSAlexander Aring { 669055923bfSAlexander Aring if (con->othercon) 670055923bfSAlexander Aring shutdown_connection(con->othercon); 671055923bfSAlexander Aring shutdown_connection(con); 672055923bfSAlexander Aring } 673055923bfSAlexander Aring 6746ed7257bSPatrick Caulfield /* Data received from remote end */ 6756ed7257bSPatrick Caulfield static int receive_from_sock(struct connection *con) 6766ed7257bSPatrick Caulfield { 6776ed7257bSPatrick Caulfield int ret = 0; 6786ed7257bSPatrick Caulfield struct msghdr msg = {}; 6796ed7257bSPatrick Caulfield struct kvec iov[2]; 6806ed7257bSPatrick Caulfield unsigned len; 6816ed7257bSPatrick Caulfield int r; 6826ed7257bSPatrick Caulfield int call_again_soon = 0; 6836ed7257bSPatrick Caulfield int nvec; 6846ed7257bSPatrick Caulfield 6856ed7257bSPatrick Caulfield mutex_lock(&con->sock_mutex); 6866ed7257bSPatrick Caulfield 6876ed7257bSPatrick Caulfield if (con->sock == NULL) { 6886ed7257bSPatrick Caulfield ret = -EAGAIN; 6896ed7257bSPatrick Caulfield goto out_close; 6906ed7257bSPatrick Caulfield } 691acee4e52SMarcelo Ricardo Leitner if (con->nodeid == 0) { 692acee4e52SMarcelo Ricardo Leitner ret = -EINVAL; 693acee4e52SMarcelo Ricardo Leitner goto out_close; 694acee4e52SMarcelo Ricardo Leitner } 6956ed7257bSPatrick Caulfield 6966ed7257bSPatrick Caulfield if (con->rx_page == NULL) { 6976ed7257bSPatrick Caulfield /* 6986ed7257bSPatrick Caulfield * This doesn't need to be atomic, but I think it should 6996ed7257bSPatrick Caulfield * improve performance if it is. 7006ed7257bSPatrick Caulfield */ 7016ed7257bSPatrick Caulfield con->rx_page = alloc_page(GFP_ATOMIC); 7026ed7257bSPatrick Caulfield if (con->rx_page == NULL) 7036ed7257bSPatrick Caulfield goto out_resched; 70409cbfeafSKirill A. Shutemov cbuf_init(&con->cb, PAGE_SIZE); 7056ed7257bSPatrick Caulfield } 7066ed7257bSPatrick Caulfield 7076ed7257bSPatrick Caulfield /* 7086ed7257bSPatrick Caulfield * iov[0] is the bit of the circular buffer between the current end 7096ed7257bSPatrick Caulfield * point (cb.base + cb.len) and the end of the buffer. 7106ed7257bSPatrick Caulfield */ 7116ed7257bSPatrick Caulfield iov[0].iov_len = con->cb.base - cbuf_data(&con->cb); 7126ed7257bSPatrick Caulfield iov[0].iov_base = page_address(con->rx_page) + cbuf_data(&con->cb); 7136ed7257bSPatrick Caulfield iov[1].iov_len = 0; 7146ed7257bSPatrick Caulfield nvec = 1; 7156ed7257bSPatrick Caulfield 7166ed7257bSPatrick Caulfield /* 7176ed7257bSPatrick Caulfield * iov[1] is the bit of the circular buffer between the start of the 7186ed7257bSPatrick Caulfield * buffer and the start of the currently used section (cb.base) 7196ed7257bSPatrick Caulfield */ 7206ed7257bSPatrick Caulfield if (cbuf_data(&con->cb) >= con->cb.base) { 72109cbfeafSKirill A. Shutemov iov[0].iov_len = PAGE_SIZE - cbuf_data(&con->cb); 7226ed7257bSPatrick Caulfield iov[1].iov_len = con->cb.base; 7236ed7257bSPatrick Caulfield iov[1].iov_base = page_address(con->rx_page); 7246ed7257bSPatrick Caulfield nvec = 2; 7256ed7257bSPatrick Caulfield } 7266ed7257bSPatrick Caulfield len = iov[0].iov_len + iov[1].iov_len; 727aa563d7bSDavid Howells iov_iter_kvec(&msg.msg_iter, READ, iov, nvec, len); 7286ed7257bSPatrick Caulfield 729c8c7840eSAl Viro r = ret = sock_recvmsg(con->sock, &msg, MSG_DONTWAIT | MSG_NOSIGNAL); 7306ed7257bSPatrick Caulfield if (ret <= 0) 7316ed7257bSPatrick Caulfield goto out_close; 732ee44b4bcSMarcelo Ricardo Leitner else if (ret == len) 733ee44b4bcSMarcelo Ricardo Leitner call_again_soon = 1; 7346ed7257bSPatrick Caulfield 7356ed7257bSPatrick Caulfield cbuf_add(&con->cb, ret); 7366ed7257bSPatrick Caulfield ret = dlm_process_incoming_buffer(con->nodeid, 7376ed7257bSPatrick Caulfield page_address(con->rx_page), 7386ed7257bSPatrick Caulfield con->cb.base, con->cb.len, 73909cbfeafSKirill A. Shutemov PAGE_SIZE); 7400ea47e4dSAlexander Aring if (ret < 0) { 7410ea47e4dSAlexander Aring log_print("lowcomms err %d: addr=%p, base=%u, len=%u, read=%d", 7420ea47e4dSAlexander Aring ret, page_address(con->rx_page), con->cb.base, 743ee44b4bcSMarcelo Ricardo Leitner con->cb.len, r); 7440ea47e4dSAlexander Aring cbuf_eat(&con->cb, r); 7450ea47e4dSAlexander Aring } else { 7466ed7257bSPatrick Caulfield cbuf_eat(&con->cb, ret); 7470ea47e4dSAlexander Aring } 7486ed7257bSPatrick Caulfield 7496ed7257bSPatrick Caulfield if (cbuf_empty(&con->cb) && !call_again_soon) { 7506ed7257bSPatrick Caulfield __free_page(con->rx_page); 7516ed7257bSPatrick Caulfield con->rx_page = NULL; 7526ed7257bSPatrick Caulfield } 7536ed7257bSPatrick Caulfield 7546ed7257bSPatrick Caulfield if (call_again_soon) 7556ed7257bSPatrick Caulfield goto out_resched; 7566ed7257bSPatrick Caulfield mutex_unlock(&con->sock_mutex); 7576ed7257bSPatrick Caulfield return 0; 7586ed7257bSPatrick Caulfield 7596ed7257bSPatrick Caulfield out_resched: 7606ed7257bSPatrick Caulfield if (!test_and_set_bit(CF_READ_PENDING, &con->flags)) 7616ed7257bSPatrick Caulfield queue_work(recv_workqueue, &con->rwork); 7626ed7257bSPatrick Caulfield mutex_unlock(&con->sock_mutex); 7636ed7257bSPatrick Caulfield return -EAGAIN; 7646ed7257bSPatrick Caulfield 7656ed7257bSPatrick Caulfield out_close: 7666ed7257bSPatrick Caulfield mutex_unlock(&con->sock_mutex); 7679e5f2825SPatrick Caulfield if (ret != -EAGAIN) { 7686ed7257bSPatrick Caulfield /* Reconnect when there is something to send */ 769055923bfSAlexander Aring close_connection(con, false, true, false); 770055923bfSAlexander Aring if (ret == 0) { 771055923bfSAlexander Aring log_print("connection %p got EOF from %d", 772055923bfSAlexander Aring con, con->nodeid); 773055923bfSAlexander Aring /* handling for tcp shutdown */ 774055923bfSAlexander Aring clear_bit(CF_SHUTDOWN, &con->flags); 775055923bfSAlexander Aring wake_up(&con->shutdown_wait); 776055923bfSAlexander Aring /* signal to breaking receive worker */ 777055923bfSAlexander Aring ret = -1; 7786ed7257bSPatrick Caulfield } 779055923bfSAlexander Aring } 7806ed7257bSPatrick Caulfield return ret; 7816ed7257bSPatrick Caulfield } 7826ed7257bSPatrick Caulfield 7836ed7257bSPatrick Caulfield /* Listening socket is busy, accept a connection */ 7840774dc76SChristoph Hellwig static int accept_from_sock(struct connection *con) 7856ed7257bSPatrick Caulfield { 7866ed7257bSPatrick Caulfield int result; 7876ed7257bSPatrick Caulfield struct sockaddr_storage peeraddr; 7886ed7257bSPatrick Caulfield struct socket *newsock; 7896ed7257bSPatrick Caulfield int len; 7906ed7257bSPatrick Caulfield int nodeid; 7916ed7257bSPatrick Caulfield struct connection *newcon; 7926ed7257bSPatrick Caulfield struct connection *addcon; 7936ed7257bSPatrick Caulfield 794513ef596SDavid Teigland if (!dlm_allow_conn) { 795513ef596SDavid Teigland return -1; 796513ef596SDavid Teigland } 797513ef596SDavid Teigland 7986ed7257bSPatrick Caulfield mutex_lock_nested(&con->sock_mutex, 0); 7996ed7257bSPatrick Caulfield 8003421fb15Stsutomu.owa@toshiba.co.jp if (!con->sock) { 8013421fb15Stsutomu.owa@toshiba.co.jp mutex_unlock(&con->sock_mutex); 8023421fb15Stsutomu.owa@toshiba.co.jp return -ENOTCONN; 8033421fb15Stsutomu.owa@toshiba.co.jp } 8046ed7257bSPatrick Caulfield 8053421fb15Stsutomu.owa@toshiba.co.jp result = kernel_accept(con->sock, &newsock, O_NONBLOCK); 8066ed7257bSPatrick Caulfield if (result < 0) 8076ed7257bSPatrick Caulfield goto accept_err; 8086ed7257bSPatrick Caulfield 8096ed7257bSPatrick Caulfield /* Get the connected socket's peer */ 8106ed7257bSPatrick Caulfield memset(&peeraddr, 0, sizeof(peeraddr)); 8119b2c45d4SDenys Vlasenko len = newsock->ops->getname(newsock, (struct sockaddr *)&peeraddr, 2); 8129b2c45d4SDenys Vlasenko if (len < 0) { 8136ed7257bSPatrick Caulfield result = -ECONNABORTED; 8146ed7257bSPatrick Caulfield goto accept_err; 8156ed7257bSPatrick Caulfield } 8166ed7257bSPatrick Caulfield 8176ed7257bSPatrick Caulfield /* Get the new node's NODEID */ 8186ed7257bSPatrick Caulfield make_sockaddr(&peeraddr, 0, &len); 81936b71a8bSDavid Teigland if (addr_to_nodeid(&peeraddr, &nodeid)) { 820bcaadf5cSMasatake YAMATO unsigned char *b=(unsigned char *)&peeraddr; 821617e82e1SDavid Teigland log_print("connect from non cluster node"); 822bcaadf5cSMasatake YAMATO print_hex_dump_bytes("ss: ", DUMP_PREFIX_NONE, 823bcaadf5cSMasatake YAMATO b, sizeof(struct sockaddr_storage)); 8246ed7257bSPatrick Caulfield sock_release(newsock); 8256ed7257bSPatrick Caulfield mutex_unlock(&con->sock_mutex); 8266ed7257bSPatrick Caulfield return -1; 8276ed7257bSPatrick Caulfield } 8286ed7257bSPatrick Caulfield 8296ed7257bSPatrick Caulfield log_print("got connection from %d", nodeid); 8306ed7257bSPatrick Caulfield 8316ed7257bSPatrick Caulfield /* Check to see if we already have a connection to this node. This 8326ed7257bSPatrick Caulfield * could happen if the two nodes initiate a connection at roughly 8336ed7257bSPatrick Caulfield * the same time and the connections cross on the wire. 8346ed7257bSPatrick Caulfield * In this case we store the incoming one in "othercon" 8356ed7257bSPatrick Caulfield */ 836748285ccSDavid Teigland newcon = nodeid2con(nodeid, GFP_NOFS); 8376ed7257bSPatrick Caulfield if (!newcon) { 8386ed7257bSPatrick Caulfield result = -ENOMEM; 8396ed7257bSPatrick Caulfield goto accept_err; 8406ed7257bSPatrick Caulfield } 8416ed7257bSPatrick Caulfield mutex_lock_nested(&newcon->sock_mutex, 1); 8426ed7257bSPatrick Caulfield if (newcon->sock) { 8436ed7257bSPatrick Caulfield struct connection *othercon = newcon->othercon; 8446ed7257bSPatrick Caulfield 8456ed7257bSPatrick Caulfield if (!othercon) { 846a47666ebSAlexander Aring othercon = kzalloc(sizeof(*othercon), GFP_NOFS); 8476ed7257bSPatrick Caulfield if (!othercon) { 848617e82e1SDavid Teigland log_print("failed to allocate incoming socket"); 8496ed7257bSPatrick Caulfield mutex_unlock(&newcon->sock_mutex); 8506ed7257bSPatrick Caulfield result = -ENOMEM; 8516ed7257bSPatrick Caulfield goto accept_err; 8526ed7257bSPatrick Caulfield } 8536ed7257bSPatrick Caulfield othercon->nodeid = nodeid; 8546ed7257bSPatrick Caulfield othercon->rx_action = receive_from_sock; 8556ed7257bSPatrick Caulfield mutex_init(&othercon->sock_mutex); 85626b41099Stsutomu.owa@toshiba.co.jp INIT_LIST_HEAD(&othercon->writequeue); 85726b41099Stsutomu.owa@toshiba.co.jp spin_lock_init(&othercon->writequeue_lock); 8586ed7257bSPatrick Caulfield INIT_WORK(&othercon->swork, process_send_sockets); 8596ed7257bSPatrick Caulfield INIT_WORK(&othercon->rwork, process_recv_sockets); 860055923bfSAlexander Aring init_waitqueue_head(&othercon->shutdown_wait); 8616ed7257bSPatrick Caulfield set_bit(CF_IS_OTHERCON, &othercon->flags); 862ba3ab3caSAlexander Aring } else { 863ba3ab3caSAlexander Aring /* close other sock con if we have something new */ 864ba3ab3caSAlexander Aring close_connection(othercon, false, true, false); 86561d96be0SPatrick Caulfield } 866ba3ab3caSAlexander Aring 867c7355827Stsutomu.owa@toshiba.co.jp mutex_lock_nested(&othercon->sock_mutex, 2); 8686ed7257bSPatrick Caulfield newcon->othercon = othercon; 869988419a9Stsutomu.owa@toshiba.co.jp add_sock(newsock, othercon); 8706ed7257bSPatrick Caulfield addcon = othercon; 871c7355827Stsutomu.owa@toshiba.co.jp mutex_unlock(&othercon->sock_mutex); 8726ed7257bSPatrick Caulfield } 8736ed7257bSPatrick Caulfield else { 8746ed7257bSPatrick Caulfield newcon->rx_action = receive_from_sock; 8753735b4b9SBob Peterson /* accept copies the sk after we've saved the callbacks, so we 8763735b4b9SBob Peterson don't want to save them a second time or comm errors will 8773735b4b9SBob Peterson result in calling sk_error_report recursively. */ 878988419a9Stsutomu.owa@toshiba.co.jp add_sock(newsock, newcon); 8796ed7257bSPatrick Caulfield addcon = newcon; 8806ed7257bSPatrick Caulfield } 8816ed7257bSPatrick Caulfield 8826ed7257bSPatrick Caulfield mutex_unlock(&newcon->sock_mutex); 8836ed7257bSPatrick Caulfield 8846ed7257bSPatrick Caulfield /* 8856ed7257bSPatrick Caulfield * Add it to the active queue in case we got data 88625985edcSLucas De Marchi * between processing the accept adding the socket 8876ed7257bSPatrick Caulfield * to the read_sockets list 8886ed7257bSPatrick Caulfield */ 8896ed7257bSPatrick Caulfield if (!test_and_set_bit(CF_READ_PENDING, &addcon->flags)) 8906ed7257bSPatrick Caulfield queue_work(recv_workqueue, &addcon->rwork); 8916ed7257bSPatrick Caulfield mutex_unlock(&con->sock_mutex); 8926ed7257bSPatrick Caulfield 8936ed7257bSPatrick Caulfield return 0; 8946ed7257bSPatrick Caulfield 8956ed7257bSPatrick Caulfield accept_err: 8966ed7257bSPatrick Caulfield mutex_unlock(&con->sock_mutex); 8973421fb15Stsutomu.owa@toshiba.co.jp if (newsock) 8986ed7257bSPatrick Caulfield sock_release(newsock); 8996ed7257bSPatrick Caulfield 9006ed7257bSPatrick Caulfield if (result != -EAGAIN) 901617e82e1SDavid Teigland log_print("error accepting connection from node: %d", result); 9026ed7257bSPatrick Caulfield return result; 9036ed7257bSPatrick Caulfield } 9046ed7257bSPatrick Caulfield 9056ed7257bSPatrick Caulfield static void free_entry(struct writequeue_entry *e) 9066ed7257bSPatrick Caulfield { 9076ed7257bSPatrick Caulfield __free_page(e->page); 9086ed7257bSPatrick Caulfield kfree(e); 9096ed7257bSPatrick Caulfield } 9106ed7257bSPatrick Caulfield 9115d689871SMike Christie /* 9125d689871SMike Christie * writequeue_entry_complete - try to delete and free write queue entry 9135d689871SMike Christie * @e: write queue entry to try to delete 9145d689871SMike Christie * @completed: bytes completed 9155d689871SMike Christie * 9165d689871SMike Christie * writequeue_lock must be held. 9175d689871SMike Christie */ 9185d689871SMike Christie static void writequeue_entry_complete(struct writequeue_entry *e, int completed) 9195d689871SMike Christie { 9205d689871SMike Christie e->offset += completed; 9215d689871SMike Christie e->len -= completed; 9225d689871SMike Christie 9235d689871SMike Christie if (e->len == 0 && e->users == 0) { 9245d689871SMike Christie list_del(&e->list); 9255d689871SMike Christie free_entry(e); 9265d689871SMike Christie } 9275d689871SMike Christie } 9285d689871SMike Christie 929ee44b4bcSMarcelo Ricardo Leitner /* 930ee44b4bcSMarcelo Ricardo Leitner * sctp_bind_addrs - bind a SCTP socket to all our addresses 931ee44b4bcSMarcelo Ricardo Leitner */ 932ee44b4bcSMarcelo Ricardo Leitner static int sctp_bind_addrs(struct connection *con, uint16_t port) 933ee44b4bcSMarcelo Ricardo Leitner { 934ee44b4bcSMarcelo Ricardo Leitner struct sockaddr_storage localaddr; 935c0425a42SChristoph Hellwig struct sockaddr *addr = (struct sockaddr *)&localaddr; 936ee44b4bcSMarcelo Ricardo Leitner int i, addr_len, result = 0; 937ee44b4bcSMarcelo Ricardo Leitner 938ee44b4bcSMarcelo Ricardo Leitner for (i = 0; i < dlm_local_count; i++) { 939ee44b4bcSMarcelo Ricardo Leitner memcpy(&localaddr, dlm_local_addr[i], sizeof(localaddr)); 940ee44b4bcSMarcelo Ricardo Leitner make_sockaddr(&localaddr, port, &addr_len); 941ee44b4bcSMarcelo Ricardo Leitner 942ee44b4bcSMarcelo Ricardo Leitner if (!i) 943c0425a42SChristoph Hellwig result = kernel_bind(con->sock, addr, addr_len); 944ee44b4bcSMarcelo Ricardo Leitner else 945c0425a42SChristoph Hellwig result = sock_bind_add(con->sock->sk, addr, addr_len); 946ee44b4bcSMarcelo Ricardo Leitner 947ee44b4bcSMarcelo Ricardo Leitner if (result < 0) { 948ee44b4bcSMarcelo Ricardo Leitner log_print("Can't bind to %d addr number %d, %d.\n", 949ee44b4bcSMarcelo Ricardo Leitner port, i + 1, result); 950ee44b4bcSMarcelo Ricardo Leitner break; 951ee44b4bcSMarcelo Ricardo Leitner } 952ee44b4bcSMarcelo Ricardo Leitner } 953ee44b4bcSMarcelo Ricardo Leitner return result; 954ee44b4bcSMarcelo Ricardo Leitner } 955ee44b4bcSMarcelo Ricardo Leitner 9566ed7257bSPatrick Caulfield /* Initiate an SCTP association. 9576ed7257bSPatrick Caulfield This is a special case of send_to_sock() in that we don't yet have a 9586ed7257bSPatrick Caulfield peeled-off socket for this association, so we use the listening socket 9596ed7257bSPatrick Caulfield and add the primary IP address of the remote node. 9606ed7257bSPatrick Caulfield */ 961ee44b4bcSMarcelo Ricardo Leitner static void sctp_connect_to_sock(struct connection *con) 9626ed7257bSPatrick Caulfield { 963ee44b4bcSMarcelo Ricardo Leitner struct sockaddr_storage daddr; 964ee44b4bcSMarcelo Ricardo Leitner int result; 965ee44b4bcSMarcelo Ricardo Leitner int addr_len; 966ee44b4bcSMarcelo Ricardo Leitner struct socket *sock; 9679c9f168fSAlexander Aring unsigned int mark; 968ee44b4bcSMarcelo Ricardo Leitner 969ee44b4bcSMarcelo Ricardo Leitner if (con->nodeid == 0) { 970ee44b4bcSMarcelo Ricardo Leitner log_print("attempt to connect sock 0 foiled"); 971ee44b4bcSMarcelo Ricardo Leitner return; 972ee44b4bcSMarcelo Ricardo Leitner } 9736ed7257bSPatrick Caulfield 9745d689871SMike Christie mutex_lock(&con->sock_mutex); 9756ed7257bSPatrick Caulfield 976ee44b4bcSMarcelo Ricardo Leitner /* Some odd races can cause double-connects, ignore them */ 977ee44b4bcSMarcelo Ricardo Leitner if (con->retries++ > MAX_CONNECT_RETRIES) 978ee44b4bcSMarcelo Ricardo Leitner goto out; 979ee44b4bcSMarcelo Ricardo Leitner 980ee44b4bcSMarcelo Ricardo Leitner if (con->sock) { 981ee44b4bcSMarcelo Ricardo Leitner log_print("node %d already connected.", con->nodeid); 982ee44b4bcSMarcelo Ricardo Leitner goto out; 983ee44b4bcSMarcelo Ricardo Leitner } 984ee44b4bcSMarcelo Ricardo Leitner 985ee44b4bcSMarcelo Ricardo Leitner memset(&daddr, 0, sizeof(daddr)); 986ee44b4bcSMarcelo Ricardo Leitner result = nodeid_to_addr(con->nodeid, &daddr, NULL, true); 987ee44b4bcSMarcelo Ricardo Leitner if (result < 0) { 9886ed7257bSPatrick Caulfield log_print("no address for nodeid %d", con->nodeid); 989ee44b4bcSMarcelo Ricardo Leitner goto out; 99004bedd79SDavid Teigland } 9916ed7257bSPatrick Caulfield 992ee44b4bcSMarcelo Ricardo Leitner /* Create a socket to communicate with */ 993ee44b4bcSMarcelo Ricardo Leitner result = sock_create_kern(&init_net, dlm_local_addr[0]->ss_family, 994ee44b4bcSMarcelo Ricardo Leitner SOCK_STREAM, IPPROTO_SCTP, &sock); 995ee44b4bcSMarcelo Ricardo Leitner if (result < 0) 996ee44b4bcSMarcelo Ricardo Leitner goto socket_err; 9976ed7257bSPatrick Caulfield 9989c9f168fSAlexander Aring /* set skb mark */ 9999c9f168fSAlexander Aring result = dlm_comm_mark(con->nodeid, &mark); 10009c9f168fSAlexander Aring if (result < 0) 10019c9f168fSAlexander Aring goto bind_err; 10029c9f168fSAlexander Aring 10039c9f168fSAlexander Aring sock_set_mark(sock->sk, mark); 10049c9f168fSAlexander Aring 1005ee44b4bcSMarcelo Ricardo Leitner con->rx_action = receive_from_sock; 1006ee44b4bcSMarcelo Ricardo Leitner con->connect_action = sctp_connect_to_sock; 1007988419a9Stsutomu.owa@toshiba.co.jp add_sock(sock, con); 10086ed7257bSPatrick Caulfield 1009ee44b4bcSMarcelo Ricardo Leitner /* Bind to all addresses. */ 1010ee44b4bcSMarcelo Ricardo Leitner if (sctp_bind_addrs(con, 0)) 1011ee44b4bcSMarcelo Ricardo Leitner goto bind_err; 101298e1b60eSMike Christie 1013ee44b4bcSMarcelo Ricardo Leitner make_sockaddr(&daddr, dlm_config.ci_tcp_port, &addr_len); 10146ed7257bSPatrick Caulfield 1015ee44b4bcSMarcelo Ricardo Leitner log_print("connecting to %d", con->nodeid); 10166ed7257bSPatrick Caulfield 1017ee44b4bcSMarcelo Ricardo Leitner /* Turn off Nagle's algorithm */ 101840ef92c6SChristoph Hellwig sctp_sock_set_nodelay(sock->sk); 1019ee44b4bcSMarcelo Ricardo Leitner 1020f706d830SGang He /* 1021f706d830SGang He * Make sock->ops->connect() function return in specified time, 1022f706d830SGang He * since O_NONBLOCK argument in connect() function does not work here, 1023f706d830SGang He * then, we should restore the default value of this attribute. 1024f706d830SGang He */ 102576ee0785SChristoph Hellwig sock_set_sndtimeo(sock->sk, 5); 1026ee44b4bcSMarcelo Ricardo Leitner result = sock->ops->connect(sock, (struct sockaddr *)&daddr, addr_len, 1027da3627c3SGang He 0); 102876ee0785SChristoph Hellwig sock_set_sndtimeo(sock->sk, 0); 1029f706d830SGang He 1030ee44b4bcSMarcelo Ricardo Leitner if (result == -EINPROGRESS) 1031ee44b4bcSMarcelo Ricardo Leitner result = 0; 1032ee44b4bcSMarcelo Ricardo Leitner if (result == 0) 1033ee44b4bcSMarcelo Ricardo Leitner goto out; 1034ee44b4bcSMarcelo Ricardo Leitner 1035ee44b4bcSMarcelo Ricardo Leitner bind_err: 1036ee44b4bcSMarcelo Ricardo Leitner con->sock = NULL; 1037ee44b4bcSMarcelo Ricardo Leitner sock_release(sock); 1038ee44b4bcSMarcelo Ricardo Leitner 1039ee44b4bcSMarcelo Ricardo Leitner socket_err: 1040ee44b4bcSMarcelo Ricardo Leitner /* 1041ee44b4bcSMarcelo Ricardo Leitner * Some errors are fatal and this list might need adjusting. For other 1042ee44b4bcSMarcelo Ricardo Leitner * errors we try again until the max number of retries is reached. 1043ee44b4bcSMarcelo Ricardo Leitner */ 1044ee44b4bcSMarcelo Ricardo Leitner if (result != -EHOSTUNREACH && 1045ee44b4bcSMarcelo Ricardo Leitner result != -ENETUNREACH && 1046ee44b4bcSMarcelo Ricardo Leitner result != -ENETDOWN && 1047ee44b4bcSMarcelo Ricardo Leitner result != -EINVAL && 1048ee44b4bcSMarcelo Ricardo Leitner result != -EPROTONOSUPPORT) { 1049ee44b4bcSMarcelo Ricardo Leitner log_print("connect %d try %d error %d", con->nodeid, 1050ee44b4bcSMarcelo Ricardo Leitner con->retries, result); 1051ee44b4bcSMarcelo Ricardo Leitner mutex_unlock(&con->sock_mutex); 1052ee44b4bcSMarcelo Ricardo Leitner msleep(1000); 1053ee44b4bcSMarcelo Ricardo Leitner lowcomms_connect_sock(con); 1054ee44b4bcSMarcelo Ricardo Leitner return; 10556ed7257bSPatrick Caulfield } 10565d689871SMike Christie 1057ee44b4bcSMarcelo Ricardo Leitner out: 10585d689871SMike Christie mutex_unlock(&con->sock_mutex); 10596ed7257bSPatrick Caulfield } 10606ed7257bSPatrick Caulfield 10616ed7257bSPatrick Caulfield /* Connect a new socket to its peer */ 10626ed7257bSPatrick Caulfield static void tcp_connect_to_sock(struct connection *con) 10636ed7257bSPatrick Caulfield { 10646bd8fedaSLon Hohberger struct sockaddr_storage saddr, src_addr; 10656ed7257bSPatrick Caulfield int addr_len; 1066a89d63a1SCasey Dahlin struct socket *sock = NULL; 10679c9f168fSAlexander Aring unsigned int mark; 106836b71a8bSDavid Teigland int result; 10696ed7257bSPatrick Caulfield 10706ed7257bSPatrick Caulfield if (con->nodeid == 0) { 10716ed7257bSPatrick Caulfield log_print("attempt to connect sock 0 foiled"); 10726ed7257bSPatrick Caulfield return; 10736ed7257bSPatrick Caulfield } 10746ed7257bSPatrick Caulfield 10756ed7257bSPatrick Caulfield mutex_lock(&con->sock_mutex); 10766ed7257bSPatrick Caulfield if (con->retries++ > MAX_CONNECT_RETRIES) 10776ed7257bSPatrick Caulfield goto out; 10786ed7257bSPatrick Caulfield 10796ed7257bSPatrick Caulfield /* Some odd races can cause double-connects, ignore them */ 108036b71a8bSDavid Teigland if (con->sock) 10816ed7257bSPatrick Caulfield goto out; 10826ed7257bSPatrick Caulfield 10836ed7257bSPatrick Caulfield /* Create a socket to communicate with */ 1084eeb1bd5cSEric W. Biederman result = sock_create_kern(&init_net, dlm_local_addr[0]->ss_family, 1085eeb1bd5cSEric W. Biederman SOCK_STREAM, IPPROTO_TCP, &sock); 10866ed7257bSPatrick Caulfield if (result < 0) 10876ed7257bSPatrick Caulfield goto out_err; 10886ed7257bSPatrick Caulfield 10899c9f168fSAlexander Aring /* set skb mark */ 10909c9f168fSAlexander Aring result = dlm_comm_mark(con->nodeid, &mark); 10919c9f168fSAlexander Aring if (result < 0) 10929c9f168fSAlexander Aring goto out_err; 10939c9f168fSAlexander Aring 10949c9f168fSAlexander Aring sock_set_mark(sock->sk, mark); 10959c9f168fSAlexander Aring 10966ed7257bSPatrick Caulfield memset(&saddr, 0, sizeof(saddr)); 109798e1b60eSMike Christie result = nodeid_to_addr(con->nodeid, &saddr, NULL, false); 109836b71a8bSDavid Teigland if (result < 0) { 109936b71a8bSDavid Teigland log_print("no address for nodeid %d", con->nodeid); 11006ed7257bSPatrick Caulfield goto out_err; 110136b71a8bSDavid Teigland } 11026ed7257bSPatrick Caulfield 11036ed7257bSPatrick Caulfield con->rx_action = receive_from_sock; 11046ed7257bSPatrick Caulfield con->connect_action = tcp_connect_to_sock; 1105055923bfSAlexander Aring con->shutdown_action = dlm_tcp_shutdown; 1106988419a9Stsutomu.owa@toshiba.co.jp add_sock(sock, con); 11076ed7257bSPatrick Caulfield 11086bd8fedaSLon Hohberger /* Bind to our cluster-known address connecting to avoid 11096bd8fedaSLon Hohberger routing problems */ 11106bd8fedaSLon Hohberger memcpy(&src_addr, dlm_local_addr[0], sizeof(src_addr)); 11116bd8fedaSLon Hohberger make_sockaddr(&src_addr, 0, &addr_len); 11126bd8fedaSLon Hohberger result = sock->ops->bind(sock, (struct sockaddr *) &src_addr, 11136bd8fedaSLon Hohberger addr_len); 11146bd8fedaSLon Hohberger if (result < 0) { 11156bd8fedaSLon Hohberger log_print("could not bind for connect: %d", result); 11166bd8fedaSLon Hohberger /* This *may* not indicate a critical error */ 11176bd8fedaSLon Hohberger } 11186bd8fedaSLon Hohberger 11196ed7257bSPatrick Caulfield make_sockaddr(&saddr, dlm_config.ci_tcp_port, &addr_len); 11206ed7257bSPatrick Caulfield 11216ed7257bSPatrick Caulfield log_print("connecting to %d", con->nodeid); 1122cb2d45daSDavid Teigland 1123cb2d45daSDavid Teigland /* Turn off Nagle's algorithm */ 112412abc5eeSChristoph Hellwig tcp_sock_set_nodelay(sock->sk); 1125cb2d45daSDavid Teigland 112636b71a8bSDavid Teigland result = sock->ops->connect(sock, (struct sockaddr *)&saddr, addr_len, 11276ed7257bSPatrick Caulfield O_NONBLOCK); 11286ed7257bSPatrick Caulfield if (result == -EINPROGRESS) 11296ed7257bSPatrick Caulfield result = 0; 11306ed7257bSPatrick Caulfield if (result == 0) 11316ed7257bSPatrick Caulfield goto out; 11326ed7257bSPatrick Caulfield 11336ed7257bSPatrick Caulfield out_err: 11346ed7257bSPatrick Caulfield if (con->sock) { 11356ed7257bSPatrick Caulfield sock_release(con->sock); 11366ed7257bSPatrick Caulfield con->sock = NULL; 1137a89d63a1SCasey Dahlin } else if (sock) { 1138a89d63a1SCasey Dahlin sock_release(sock); 11396ed7257bSPatrick Caulfield } 11406ed7257bSPatrick Caulfield /* 11416ed7257bSPatrick Caulfield * Some errors are fatal and this list might need adjusting. For other 11426ed7257bSPatrick Caulfield * errors we try again until the max number of retries is reached. 11436ed7257bSPatrick Caulfield */ 114436b71a8bSDavid Teigland if (result != -EHOSTUNREACH && 114536b71a8bSDavid Teigland result != -ENETUNREACH && 114636b71a8bSDavid Teigland result != -ENETDOWN && 114736b71a8bSDavid Teigland result != -EINVAL && 114836b71a8bSDavid Teigland result != -EPROTONOSUPPORT) { 114936b71a8bSDavid Teigland log_print("connect %d try %d error %d", con->nodeid, 115036b71a8bSDavid Teigland con->retries, result); 115136b71a8bSDavid Teigland mutex_unlock(&con->sock_mutex); 115236b71a8bSDavid Teigland msleep(1000); 11536ed7257bSPatrick Caulfield lowcomms_connect_sock(con); 115436b71a8bSDavid Teigland return; 11556ed7257bSPatrick Caulfield } 11566ed7257bSPatrick Caulfield out: 11576ed7257bSPatrick Caulfield mutex_unlock(&con->sock_mutex); 11586ed7257bSPatrick Caulfield return; 11596ed7257bSPatrick Caulfield } 11606ed7257bSPatrick Caulfield 11616ed7257bSPatrick Caulfield static struct socket *tcp_create_listen_sock(struct connection *con, 11626ed7257bSPatrick Caulfield struct sockaddr_storage *saddr) 11636ed7257bSPatrick Caulfield { 11646ed7257bSPatrick Caulfield struct socket *sock = NULL; 11656ed7257bSPatrick Caulfield int result = 0; 11666ed7257bSPatrick Caulfield int addr_len; 11676ed7257bSPatrick Caulfield 11686ed7257bSPatrick Caulfield if (dlm_local_addr[0]->ss_family == AF_INET) 11696ed7257bSPatrick Caulfield addr_len = sizeof(struct sockaddr_in); 11706ed7257bSPatrick Caulfield else 11716ed7257bSPatrick Caulfield addr_len = sizeof(struct sockaddr_in6); 11726ed7257bSPatrick Caulfield 11736ed7257bSPatrick Caulfield /* Create a socket to communicate with */ 1174eeb1bd5cSEric W. Biederman result = sock_create_kern(&init_net, dlm_local_addr[0]->ss_family, 1175eeb1bd5cSEric W. Biederman SOCK_STREAM, IPPROTO_TCP, &sock); 11766ed7257bSPatrick Caulfield if (result < 0) { 1177617e82e1SDavid Teigland log_print("Can't create listening comms socket"); 11786ed7257bSPatrick Caulfield goto create_out; 11796ed7257bSPatrick Caulfield } 11806ed7257bSPatrick Caulfield 1181a5b7ab63SAlexander Aring sock_set_mark(sock->sk, dlm_config.ci_mark); 1182a5b7ab63SAlexander Aring 1183cb2d45daSDavid Teigland /* Turn off Nagle's algorithm */ 118412abc5eeSChristoph Hellwig tcp_sock_set_nodelay(sock->sk); 1185cb2d45daSDavid Teigland 1186b58f0e8fSChristoph Hellwig sock_set_reuseaddr(sock->sk); 11876ed7257bSPatrick Caulfield 118893eaadebStsutomu.owa@toshiba.co.jp write_lock_bh(&sock->sk->sk_callback_lock); 1189b81171cbSBob Peterson sock->sk->sk_user_data = con; 1190cc661fc9SBob Peterson save_listen_callbacks(sock); 11910774dc76SChristoph Hellwig con->rx_action = accept_from_sock; 11926ed7257bSPatrick Caulfield con->connect_action = tcp_connect_to_sock; 119393eaadebStsutomu.owa@toshiba.co.jp write_unlock_bh(&sock->sk->sk_callback_lock); 11946ed7257bSPatrick Caulfield 11956ed7257bSPatrick Caulfield /* Bind to our port */ 11966ed7257bSPatrick Caulfield make_sockaddr(saddr, dlm_config.ci_tcp_port, &addr_len); 11976ed7257bSPatrick Caulfield result = sock->ops->bind(sock, (struct sockaddr *) saddr, addr_len); 11986ed7257bSPatrick Caulfield if (result < 0) { 1199617e82e1SDavid Teigland log_print("Can't bind to port %d", dlm_config.ci_tcp_port); 12006ed7257bSPatrick Caulfield sock_release(sock); 12016ed7257bSPatrick Caulfield sock = NULL; 12026ed7257bSPatrick Caulfield con->sock = NULL; 12036ed7257bSPatrick Caulfield goto create_out; 12046ed7257bSPatrick Caulfield } 1205ce3d9544SChristoph Hellwig sock_set_keepalive(sock->sk); 12066ed7257bSPatrick Caulfield 12076ed7257bSPatrick Caulfield result = sock->ops->listen(sock, 5); 12086ed7257bSPatrick Caulfield if (result < 0) { 1209617e82e1SDavid Teigland log_print("Can't listen on port %d", dlm_config.ci_tcp_port); 12106ed7257bSPatrick Caulfield sock_release(sock); 12116ed7257bSPatrick Caulfield sock = NULL; 12126ed7257bSPatrick Caulfield goto create_out; 12136ed7257bSPatrick Caulfield } 12146ed7257bSPatrick Caulfield 12156ed7257bSPatrick Caulfield create_out: 12166ed7257bSPatrick Caulfield return sock; 12176ed7257bSPatrick Caulfield } 12186ed7257bSPatrick Caulfield 12196ed7257bSPatrick Caulfield /* Get local addresses */ 12206ed7257bSPatrick Caulfield static void init_local(void) 12216ed7257bSPatrick Caulfield { 12226ed7257bSPatrick Caulfield struct sockaddr_storage sas, *addr; 12236ed7257bSPatrick Caulfield int i; 12246ed7257bSPatrick Caulfield 122530d3a237SPatrick Caulfield dlm_local_count = 0; 12261b189b88SDavid Teigland for (i = 0; i < DLM_MAX_ADDR_COUNT; i++) { 12276ed7257bSPatrick Caulfield if (dlm_our_addr(&sas, i)) 12286ed7257bSPatrick Caulfield break; 12296ed7257bSPatrick Caulfield 12305c93f56fSAmitoj Kaur Chawla addr = kmemdup(&sas, sizeof(*addr), GFP_NOFS); 12316ed7257bSPatrick Caulfield if (!addr) 12326ed7257bSPatrick Caulfield break; 12336ed7257bSPatrick Caulfield dlm_local_addr[dlm_local_count++] = addr; 12346ed7257bSPatrick Caulfield } 12356ed7257bSPatrick Caulfield } 12366ed7257bSPatrick Caulfield 1237043697f0SAlexander Aring static void deinit_local(void) 1238043697f0SAlexander Aring { 1239043697f0SAlexander Aring int i; 1240043697f0SAlexander Aring 1241043697f0SAlexander Aring for (i = 0; i < dlm_local_count; i++) 1242043697f0SAlexander Aring kfree(dlm_local_addr[i]); 1243043697f0SAlexander Aring } 1244043697f0SAlexander Aring 12456ed7257bSPatrick Caulfield /* Initialise SCTP socket and bind to all interfaces */ 12466ed7257bSPatrick Caulfield static int sctp_listen_for_all(void) 12476ed7257bSPatrick Caulfield { 12486ed7257bSPatrick Caulfield struct socket *sock = NULL; 1249ee44b4bcSMarcelo Ricardo Leitner int result = -EINVAL; 1250573c24c4SDavid Teigland struct connection *con = nodeid2con(0, GFP_NOFS); 12516ed7257bSPatrick Caulfield 12526ed7257bSPatrick Caulfield if (!con) 12536ed7257bSPatrick Caulfield return -ENOMEM; 12546ed7257bSPatrick Caulfield 12556ed7257bSPatrick Caulfield log_print("Using SCTP for communications"); 12566ed7257bSPatrick Caulfield 1257eeb1bd5cSEric W. Biederman result = sock_create_kern(&init_net, dlm_local_addr[0]->ss_family, 1258ee44b4bcSMarcelo Ricardo Leitner SOCK_STREAM, IPPROTO_SCTP, &sock); 12596ed7257bSPatrick Caulfield if (result < 0) { 12606ed7257bSPatrick Caulfield log_print("Can't create comms socket, check SCTP is loaded"); 12616ed7257bSPatrick Caulfield goto out; 12626ed7257bSPatrick Caulfield } 12636ed7257bSPatrick Caulfield 126426cfabf9SChristoph Hellwig sock_set_rcvbuf(sock->sk, NEEDED_RMEM); 1265a5b7ab63SAlexander Aring sock_set_mark(sock->sk, dlm_config.ci_mark); 126640ef92c6SChristoph Hellwig sctp_sock_set_nodelay(sock->sk); 126786e92ad2SMike Christie 1268b81171cbSBob Peterson write_lock_bh(&sock->sk->sk_callback_lock); 12696ed7257bSPatrick Caulfield /* Init con struct */ 12706ed7257bSPatrick Caulfield sock->sk->sk_user_data = con; 1271cc661fc9SBob Peterson save_listen_callbacks(sock); 12726ed7257bSPatrick Caulfield con->sock = sock; 12736ed7257bSPatrick Caulfield con->sock->sk->sk_data_ready = lowcomms_data_ready; 12740774dc76SChristoph Hellwig con->rx_action = accept_from_sock; 1275ee44b4bcSMarcelo Ricardo Leitner con->connect_action = sctp_connect_to_sock; 12766ed7257bSPatrick Caulfield 1277b81171cbSBob Peterson write_unlock_bh(&sock->sk->sk_callback_lock); 1278b81171cbSBob Peterson 1279ee44b4bcSMarcelo Ricardo Leitner /* Bind to all addresses. */ 1280ee44b4bcSMarcelo Ricardo Leitner if (sctp_bind_addrs(con, dlm_config.ci_tcp_port)) 12816ed7257bSPatrick Caulfield goto create_delsock; 12826ed7257bSPatrick Caulfield 12836ed7257bSPatrick Caulfield result = sock->ops->listen(sock, 5); 12846ed7257bSPatrick Caulfield if (result < 0) { 12856ed7257bSPatrick Caulfield log_print("Can't set socket listening"); 12866ed7257bSPatrick Caulfield goto create_delsock; 12876ed7257bSPatrick Caulfield } 12886ed7257bSPatrick Caulfield 12896ed7257bSPatrick Caulfield return 0; 12906ed7257bSPatrick Caulfield 12916ed7257bSPatrick Caulfield create_delsock: 12926ed7257bSPatrick Caulfield sock_release(sock); 12936ed7257bSPatrick Caulfield con->sock = NULL; 12946ed7257bSPatrick Caulfield out: 12956ed7257bSPatrick Caulfield return result; 12966ed7257bSPatrick Caulfield } 12976ed7257bSPatrick Caulfield 12986ed7257bSPatrick Caulfield static int tcp_listen_for_all(void) 12996ed7257bSPatrick Caulfield { 13006ed7257bSPatrick Caulfield struct socket *sock = NULL; 1301573c24c4SDavid Teigland struct connection *con = nodeid2con(0, GFP_NOFS); 13026ed7257bSPatrick Caulfield int result = -EINVAL; 13036ed7257bSPatrick Caulfield 13046ed7257bSPatrick Caulfield if (!con) 13056ed7257bSPatrick Caulfield return -ENOMEM; 13066ed7257bSPatrick Caulfield 13076ed7257bSPatrick Caulfield /* We don't support multi-homed hosts */ 13086ed7257bSPatrick Caulfield if (dlm_local_addr[1] != NULL) { 1309617e82e1SDavid Teigland log_print("TCP protocol can't handle multi-homed hosts, " 1310617e82e1SDavid Teigland "try SCTP"); 13116ed7257bSPatrick Caulfield return -EINVAL; 13126ed7257bSPatrick Caulfield } 13136ed7257bSPatrick Caulfield 13146ed7257bSPatrick Caulfield log_print("Using TCP for communications"); 13156ed7257bSPatrick Caulfield 13166ed7257bSPatrick Caulfield sock = tcp_create_listen_sock(con, dlm_local_addr[0]); 13176ed7257bSPatrick Caulfield if (sock) { 1318988419a9Stsutomu.owa@toshiba.co.jp add_sock(sock, con); 13196ed7257bSPatrick Caulfield result = 0; 13206ed7257bSPatrick Caulfield } 13216ed7257bSPatrick Caulfield else { 13226ed7257bSPatrick Caulfield result = -EADDRINUSE; 13236ed7257bSPatrick Caulfield } 13246ed7257bSPatrick Caulfield 13256ed7257bSPatrick Caulfield return result; 13266ed7257bSPatrick Caulfield } 13276ed7257bSPatrick Caulfield 13286ed7257bSPatrick Caulfield 13296ed7257bSPatrick Caulfield 13306ed7257bSPatrick Caulfield static struct writequeue_entry *new_writequeue_entry(struct connection *con, 13316ed7257bSPatrick Caulfield gfp_t allocation) 13326ed7257bSPatrick Caulfield { 13336ed7257bSPatrick Caulfield struct writequeue_entry *entry; 13346ed7257bSPatrick Caulfield 13356ed7257bSPatrick Caulfield entry = kmalloc(sizeof(struct writequeue_entry), allocation); 13366ed7257bSPatrick Caulfield if (!entry) 13376ed7257bSPatrick Caulfield return NULL; 13386ed7257bSPatrick Caulfield 13396ed7257bSPatrick Caulfield entry->page = alloc_page(allocation); 13406ed7257bSPatrick Caulfield if (!entry->page) { 13416ed7257bSPatrick Caulfield kfree(entry); 13426ed7257bSPatrick Caulfield return NULL; 13436ed7257bSPatrick Caulfield } 13446ed7257bSPatrick Caulfield 13456ed7257bSPatrick Caulfield entry->offset = 0; 13466ed7257bSPatrick Caulfield entry->len = 0; 13476ed7257bSPatrick Caulfield entry->end = 0; 13486ed7257bSPatrick Caulfield entry->users = 0; 13496ed7257bSPatrick Caulfield entry->con = con; 13506ed7257bSPatrick Caulfield 13516ed7257bSPatrick Caulfield return entry; 13526ed7257bSPatrick Caulfield } 13536ed7257bSPatrick Caulfield 1354617e82e1SDavid Teigland void *dlm_lowcomms_get_buffer(int nodeid, int len, gfp_t allocation, char **ppc) 13556ed7257bSPatrick Caulfield { 13566ed7257bSPatrick Caulfield struct connection *con; 13576ed7257bSPatrick Caulfield struct writequeue_entry *e; 13586ed7257bSPatrick Caulfield int offset = 0; 13596ed7257bSPatrick Caulfield 13606ed7257bSPatrick Caulfield con = nodeid2con(nodeid, allocation); 13616ed7257bSPatrick Caulfield if (!con) 13626ed7257bSPatrick Caulfield return NULL; 13636ed7257bSPatrick Caulfield 13646ed7257bSPatrick Caulfield spin_lock(&con->writequeue_lock); 13656ed7257bSPatrick Caulfield e = list_entry(con->writequeue.prev, struct writequeue_entry, list); 13666ed7257bSPatrick Caulfield if ((&e->list == &con->writequeue) || 136709cbfeafSKirill A. Shutemov (PAGE_SIZE - e->end < len)) { 13686ed7257bSPatrick Caulfield e = NULL; 13696ed7257bSPatrick Caulfield } else { 13706ed7257bSPatrick Caulfield offset = e->end; 13716ed7257bSPatrick Caulfield e->end += len; 1372eeee2b5fSWei Yongjun e->users++; 13736ed7257bSPatrick Caulfield } 13746ed7257bSPatrick Caulfield spin_unlock(&con->writequeue_lock); 13756ed7257bSPatrick Caulfield 13766ed7257bSPatrick Caulfield if (e) { 13776ed7257bSPatrick Caulfield got_one: 13786ed7257bSPatrick Caulfield *ppc = page_address(e->page) + offset; 13796ed7257bSPatrick Caulfield return e; 13806ed7257bSPatrick Caulfield } 13816ed7257bSPatrick Caulfield 13826ed7257bSPatrick Caulfield e = new_writequeue_entry(con, allocation); 13836ed7257bSPatrick Caulfield if (e) { 13846ed7257bSPatrick Caulfield spin_lock(&con->writequeue_lock); 13856ed7257bSPatrick Caulfield offset = e->end; 13866ed7257bSPatrick Caulfield e->end += len; 1387eeee2b5fSWei Yongjun e->users++; 13886ed7257bSPatrick Caulfield list_add_tail(&e->list, &con->writequeue); 13896ed7257bSPatrick Caulfield spin_unlock(&con->writequeue_lock); 13906ed7257bSPatrick Caulfield goto got_one; 13916ed7257bSPatrick Caulfield } 13926ed7257bSPatrick Caulfield return NULL; 13936ed7257bSPatrick Caulfield } 13946ed7257bSPatrick Caulfield 13956ed7257bSPatrick Caulfield void dlm_lowcomms_commit_buffer(void *mh) 13966ed7257bSPatrick Caulfield { 13976ed7257bSPatrick Caulfield struct writequeue_entry *e = (struct writequeue_entry *)mh; 13986ed7257bSPatrick Caulfield struct connection *con = e->con; 13996ed7257bSPatrick Caulfield int users; 14006ed7257bSPatrick Caulfield 14016ed7257bSPatrick Caulfield spin_lock(&con->writequeue_lock); 14026ed7257bSPatrick Caulfield users = --e->users; 14036ed7257bSPatrick Caulfield if (users) 14046ed7257bSPatrick Caulfield goto out; 14056ed7257bSPatrick Caulfield e->len = e->end - e->offset; 14066ed7257bSPatrick Caulfield spin_unlock(&con->writequeue_lock); 14076ed7257bSPatrick Caulfield 14086ed7257bSPatrick Caulfield queue_work(send_workqueue, &con->swork); 14096ed7257bSPatrick Caulfield return; 14106ed7257bSPatrick Caulfield 14116ed7257bSPatrick Caulfield out: 14126ed7257bSPatrick Caulfield spin_unlock(&con->writequeue_lock); 14136ed7257bSPatrick Caulfield return; 14146ed7257bSPatrick Caulfield } 14156ed7257bSPatrick Caulfield 14166ed7257bSPatrick Caulfield /* Send a message */ 14176ed7257bSPatrick Caulfield static void send_to_sock(struct connection *con) 14186ed7257bSPatrick Caulfield { 14196ed7257bSPatrick Caulfield int ret = 0; 14206ed7257bSPatrick Caulfield const int msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL; 14216ed7257bSPatrick Caulfield struct writequeue_entry *e; 14226ed7257bSPatrick Caulfield int len, offset; 1423f92c8dd7SBob Peterson int count = 0; 14246ed7257bSPatrick Caulfield 14256ed7257bSPatrick Caulfield mutex_lock(&con->sock_mutex); 14266ed7257bSPatrick Caulfield if (con->sock == NULL) 14276ed7257bSPatrick Caulfield goto out_connect; 14286ed7257bSPatrick Caulfield 14296ed7257bSPatrick Caulfield spin_lock(&con->writequeue_lock); 14306ed7257bSPatrick Caulfield for (;;) { 14316ed7257bSPatrick Caulfield e = list_entry(con->writequeue.next, struct writequeue_entry, 14326ed7257bSPatrick Caulfield list); 14336ed7257bSPatrick Caulfield if ((struct list_head *) e == &con->writequeue) 14346ed7257bSPatrick Caulfield break; 14356ed7257bSPatrick Caulfield 14366ed7257bSPatrick Caulfield len = e->len; 14376ed7257bSPatrick Caulfield offset = e->offset; 14386ed7257bSPatrick Caulfield BUG_ON(len == 0 && e->users == 0); 14396ed7257bSPatrick Caulfield spin_unlock(&con->writequeue_lock); 14406ed7257bSPatrick Caulfield 14416ed7257bSPatrick Caulfield ret = 0; 14426ed7257bSPatrick Caulfield if (len) { 14431329e3f2SPaolo Bonzini ret = kernel_sendpage(con->sock, e->page, offset, len, 14446ed7257bSPatrick Caulfield msg_flags); 1445d66f8277SPatrick Caulfield if (ret == -EAGAIN || ret == 0) { 1446b36930ddSDavid Miller if (ret == -EAGAIN && 14479cd3e072SEric Dumazet test_bit(SOCKWQ_ASYNC_NOSPACE, &con->sock->flags) && 1448b36930ddSDavid Miller !test_and_set_bit(CF_APP_LIMITED, &con->flags)) { 1449b36930ddSDavid Miller /* Notify TCP that we're limited by the 1450b36930ddSDavid Miller * application window size. 1451b36930ddSDavid Miller */ 1452b36930ddSDavid Miller set_bit(SOCK_NOSPACE, &con->sock->flags); 1453b36930ddSDavid Miller con->sock->sk->sk_write_pending++; 1454b36930ddSDavid Miller } 1455d66f8277SPatrick Caulfield cond_resched(); 14566ed7257bSPatrick Caulfield goto out; 14579c5bef58SYing Xue } else if (ret < 0) 14586ed7257bSPatrick Caulfield goto send_error; 1459d66f8277SPatrick Caulfield } 1460f92c8dd7SBob Peterson 14616ed7257bSPatrick Caulfield /* Don't starve people filling buffers */ 1462f92c8dd7SBob Peterson if (++count >= MAX_SEND_MSG_COUNT) { 14636ed7257bSPatrick Caulfield cond_resched(); 1464f92c8dd7SBob Peterson count = 0; 1465f92c8dd7SBob Peterson } 14666ed7257bSPatrick Caulfield 14676ed7257bSPatrick Caulfield spin_lock(&con->writequeue_lock); 14685d689871SMike Christie writequeue_entry_complete(e, ret); 14696ed7257bSPatrick Caulfield } 14706ed7257bSPatrick Caulfield spin_unlock(&con->writequeue_lock); 14716ed7257bSPatrick Caulfield out: 14726ed7257bSPatrick Caulfield mutex_unlock(&con->sock_mutex); 14736ed7257bSPatrick Caulfield return; 14746ed7257bSPatrick Caulfield 14756ed7257bSPatrick Caulfield send_error: 14766ed7257bSPatrick Caulfield mutex_unlock(&con->sock_mutex); 1477ba3ab3caSAlexander Aring close_connection(con, false, false, true); 147801da24d3SBob Peterson /* Requeue the send work. When the work daemon runs again, it will try 147901da24d3SBob Peterson a new connection, then call this function again. */ 148001da24d3SBob Peterson queue_work(send_workqueue, &con->swork); 14816ed7257bSPatrick Caulfield return; 14826ed7257bSPatrick Caulfield 14836ed7257bSPatrick Caulfield out_connect: 14846ed7257bSPatrick Caulfield mutex_unlock(&con->sock_mutex); 148501da24d3SBob Peterson queue_work(send_workqueue, &con->swork); 148601da24d3SBob Peterson cond_resched(); 14876ed7257bSPatrick Caulfield } 14886ed7257bSPatrick Caulfield 14896ed7257bSPatrick Caulfield static void clean_one_writequeue(struct connection *con) 14906ed7257bSPatrick Caulfield { 14915e9ccc37SChristine Caulfield struct writequeue_entry *e, *safe; 14926ed7257bSPatrick Caulfield 14936ed7257bSPatrick Caulfield spin_lock(&con->writequeue_lock); 14945e9ccc37SChristine Caulfield list_for_each_entry_safe(e, safe, &con->writequeue, list) { 14956ed7257bSPatrick Caulfield list_del(&e->list); 14966ed7257bSPatrick Caulfield free_entry(e); 14976ed7257bSPatrick Caulfield } 14986ed7257bSPatrick Caulfield spin_unlock(&con->writequeue_lock); 14996ed7257bSPatrick Caulfield } 15006ed7257bSPatrick Caulfield 15016ed7257bSPatrick Caulfield /* Called from recovery when it knows that a node has 15026ed7257bSPatrick Caulfield left the cluster */ 15036ed7257bSPatrick Caulfield int dlm_lowcomms_close(int nodeid) 15046ed7257bSPatrick Caulfield { 15056ed7257bSPatrick Caulfield struct connection *con; 150636b71a8bSDavid Teigland struct dlm_node_addr *na; 15076ed7257bSPatrick Caulfield 15086ed7257bSPatrick Caulfield log_print("closing connection to node %d", nodeid); 15096ed7257bSPatrick Caulfield con = nodeid2con(nodeid, 0); 15106ed7257bSPatrick Caulfield if (con) { 1511063c4c99SLars Marowsky-Bree set_bit(CF_CLOSE, &con->flags); 15120d737a8cSMarcelo Ricardo Leitner close_connection(con, true, true, true); 15136ed7257bSPatrick Caulfield clean_one_writequeue(con); 15146ed7257bSPatrick Caulfield } 151536b71a8bSDavid Teigland 151636b71a8bSDavid Teigland spin_lock(&dlm_node_addrs_spin); 151736b71a8bSDavid Teigland na = find_node_addr(nodeid); 151836b71a8bSDavid Teigland if (na) { 151936b71a8bSDavid Teigland list_del(&na->list); 152036b71a8bSDavid Teigland while (na->addr_count--) 152136b71a8bSDavid Teigland kfree(na->addr[na->addr_count]); 152236b71a8bSDavid Teigland kfree(na); 152336b71a8bSDavid Teigland } 152436b71a8bSDavid Teigland spin_unlock(&dlm_node_addrs_spin); 152536b71a8bSDavid Teigland 15266ed7257bSPatrick Caulfield return 0; 15276ed7257bSPatrick Caulfield } 15286ed7257bSPatrick Caulfield 15296ed7257bSPatrick Caulfield /* Receive workqueue function */ 15306ed7257bSPatrick Caulfield static void process_recv_sockets(struct work_struct *work) 15316ed7257bSPatrick Caulfield { 15326ed7257bSPatrick Caulfield struct connection *con = container_of(work, struct connection, rwork); 15336ed7257bSPatrick Caulfield int err; 15346ed7257bSPatrick Caulfield 15356ed7257bSPatrick Caulfield clear_bit(CF_READ_PENDING, &con->flags); 15366ed7257bSPatrick Caulfield do { 15376ed7257bSPatrick Caulfield err = con->rx_action(con); 15386ed7257bSPatrick Caulfield } while (!err); 15396ed7257bSPatrick Caulfield } 15406ed7257bSPatrick Caulfield 15416ed7257bSPatrick Caulfield /* Send workqueue function */ 15426ed7257bSPatrick Caulfield static void process_send_sockets(struct work_struct *work) 15436ed7257bSPatrick Caulfield { 15446ed7257bSPatrick Caulfield struct connection *con = container_of(work, struct connection, swork); 15456ed7257bSPatrick Caulfield 15468a4abb08Stsutomu.owa@toshiba.co.jp clear_bit(CF_WRITE_PENDING, &con->flags); 154761d9102bSBob Peterson if (con->sock == NULL) /* not mutex protected so check it inside too */ 15486ed7257bSPatrick Caulfield con->connect_action(con); 154901da24d3SBob Peterson if (!list_empty(&con->writequeue)) 15506ed7257bSPatrick Caulfield send_to_sock(con); 15516ed7257bSPatrick Caulfield } 15526ed7257bSPatrick Caulfield 15536ed7257bSPatrick Caulfield static void work_stop(void) 15546ed7257bSPatrick Caulfield { 1555b355516fSDavid Windsor if (recv_workqueue) 15566ed7257bSPatrick Caulfield destroy_workqueue(recv_workqueue); 1557b355516fSDavid Windsor if (send_workqueue) 15586ed7257bSPatrick Caulfield destroy_workqueue(send_workqueue); 15596ed7257bSPatrick Caulfield } 15606ed7257bSPatrick Caulfield 15616ed7257bSPatrick Caulfield static int work_start(void) 15626ed7257bSPatrick Caulfield { 1563e43f055aSDavid Teigland recv_workqueue = alloc_workqueue("dlm_recv", 1564e43f055aSDavid Teigland WQ_UNBOUND | WQ_MEM_RECLAIM, 1); 1565b9d41052SNamhyung Kim if (!recv_workqueue) { 1566b9d41052SNamhyung Kim log_print("can't start dlm_recv"); 1567b9d41052SNamhyung Kim return -ENOMEM; 15686ed7257bSPatrick Caulfield } 15696ed7257bSPatrick Caulfield 1570e43f055aSDavid Teigland send_workqueue = alloc_workqueue("dlm_send", 1571e43f055aSDavid Teigland WQ_UNBOUND | WQ_MEM_RECLAIM, 1); 1572b9d41052SNamhyung Kim if (!send_workqueue) { 1573b9d41052SNamhyung Kim log_print("can't start dlm_send"); 15746ed7257bSPatrick Caulfield destroy_workqueue(recv_workqueue); 1575b9d41052SNamhyung Kim return -ENOMEM; 15766ed7257bSPatrick Caulfield } 15776ed7257bSPatrick Caulfield 15786ed7257bSPatrick Caulfield return 0; 15796ed7257bSPatrick Caulfield } 15806ed7257bSPatrick Caulfield 1581f0fb83cbStsutomu.owa@toshiba.co.jp static void _stop_conn(struct connection *con, bool and_other) 15826ed7257bSPatrick Caulfield { 1583f0fb83cbStsutomu.owa@toshiba.co.jp mutex_lock(&con->sock_mutex); 1584173a31feStsutomu.owa@toshiba.co.jp set_bit(CF_CLOSE, &con->flags); 1585f0fb83cbStsutomu.owa@toshiba.co.jp set_bit(CF_READ_PENDING, &con->flags); 15868a4abb08Stsutomu.owa@toshiba.co.jp set_bit(CF_WRITE_PENDING, &con->flags); 158793eaadebStsutomu.owa@toshiba.co.jp if (con->sock && con->sock->sk) { 158893eaadebStsutomu.owa@toshiba.co.jp write_lock_bh(&con->sock->sk->sk_callback_lock); 1589afb853fbSPatrick Caulfield con->sock->sk->sk_user_data = NULL; 159093eaadebStsutomu.owa@toshiba.co.jp write_unlock_bh(&con->sock->sk->sk_callback_lock); 159193eaadebStsutomu.owa@toshiba.co.jp } 1592f0fb83cbStsutomu.owa@toshiba.co.jp if (con->othercon && and_other) 1593f0fb83cbStsutomu.owa@toshiba.co.jp _stop_conn(con->othercon, false); 1594f0fb83cbStsutomu.owa@toshiba.co.jp mutex_unlock(&con->sock_mutex); 1595f0fb83cbStsutomu.owa@toshiba.co.jp } 1596f0fb83cbStsutomu.owa@toshiba.co.jp 1597f0fb83cbStsutomu.owa@toshiba.co.jp static void stop_conn(struct connection *con) 1598f0fb83cbStsutomu.owa@toshiba.co.jp { 1599f0fb83cbStsutomu.owa@toshiba.co.jp _stop_conn(con, true); 1600afb853fbSPatrick Caulfield } 16015e9ccc37SChristine Caulfield 1602055923bfSAlexander Aring static void shutdown_conn(struct connection *con) 1603055923bfSAlexander Aring { 1604055923bfSAlexander Aring if (con->shutdown_action) 1605055923bfSAlexander Aring con->shutdown_action(con); 1606055923bfSAlexander Aring } 1607055923bfSAlexander Aring 16085e9ccc37SChristine Caulfield static void free_conn(struct connection *con) 16095e9ccc37SChristine Caulfield { 16100d737a8cSMarcelo Ricardo Leitner close_connection(con, true, true, true); 1611a47666ebSAlexander Aring spin_lock(&connections_lock); 1612a47666ebSAlexander Aring hlist_del_rcu(&con->list); 1613a47666ebSAlexander Aring spin_unlock(&connections_lock); 1614948c47e9SAlexander Aring if (con->othercon) { 1615948c47e9SAlexander Aring clean_one_writequeue(con->othercon); 1616948c47e9SAlexander Aring kfree_rcu(con->othercon, rcu); 1617948c47e9SAlexander Aring } 16180de98432SAlexander Aring clean_one_writequeue(con); 1619a47666ebSAlexander Aring kfree_rcu(con, rcu); 16206ed7257bSPatrick Caulfield } 16215e9ccc37SChristine Caulfield 1622f0fb83cbStsutomu.owa@toshiba.co.jp static void work_flush(void) 1623f0fb83cbStsutomu.owa@toshiba.co.jp { 1624a47666ebSAlexander Aring int ok, idx; 1625f0fb83cbStsutomu.owa@toshiba.co.jp int i; 1626f0fb83cbStsutomu.owa@toshiba.co.jp struct connection *con; 1627f0fb83cbStsutomu.owa@toshiba.co.jp 1628f0fb83cbStsutomu.owa@toshiba.co.jp do { 1629f0fb83cbStsutomu.owa@toshiba.co.jp ok = 1; 1630f0fb83cbStsutomu.owa@toshiba.co.jp foreach_conn(stop_conn); 1631b355516fSDavid Windsor if (recv_workqueue) 1632f0fb83cbStsutomu.owa@toshiba.co.jp flush_workqueue(recv_workqueue); 1633b355516fSDavid Windsor if (send_workqueue) 1634f0fb83cbStsutomu.owa@toshiba.co.jp flush_workqueue(send_workqueue); 1635a47666ebSAlexander Aring idx = srcu_read_lock(&connections_srcu); 1636f0fb83cbStsutomu.owa@toshiba.co.jp for (i = 0; i < CONN_HASH_SIZE && ok; i++) { 1637a47666ebSAlexander Aring hlist_for_each_entry_rcu(con, &connection_hash[i], 1638a47666ebSAlexander Aring list) { 1639f0fb83cbStsutomu.owa@toshiba.co.jp ok &= test_bit(CF_READ_PENDING, &con->flags); 16408a4abb08Stsutomu.owa@toshiba.co.jp ok &= test_bit(CF_WRITE_PENDING, &con->flags); 16418a4abb08Stsutomu.owa@toshiba.co.jp if (con->othercon) { 1642f0fb83cbStsutomu.owa@toshiba.co.jp ok &= test_bit(CF_READ_PENDING, 1643f0fb83cbStsutomu.owa@toshiba.co.jp &con->othercon->flags); 16448a4abb08Stsutomu.owa@toshiba.co.jp ok &= test_bit(CF_WRITE_PENDING, 16458a4abb08Stsutomu.owa@toshiba.co.jp &con->othercon->flags); 16468a4abb08Stsutomu.owa@toshiba.co.jp } 1647f0fb83cbStsutomu.owa@toshiba.co.jp } 1648f0fb83cbStsutomu.owa@toshiba.co.jp } 1649a47666ebSAlexander Aring srcu_read_unlock(&connections_srcu, idx); 1650f0fb83cbStsutomu.owa@toshiba.co.jp } while (!ok); 1651f0fb83cbStsutomu.owa@toshiba.co.jp } 1652f0fb83cbStsutomu.owa@toshiba.co.jp 16535e9ccc37SChristine Caulfield void dlm_lowcomms_stop(void) 16545e9ccc37SChristine Caulfield { 16555e9ccc37SChristine Caulfield /* Set all the flags to prevent any 16565e9ccc37SChristine Caulfield socket activity. 16575e9ccc37SChristine Caulfield */ 1658513ef596SDavid Teigland dlm_allow_conn = 0; 1659aa7ab1e2SAlexander Aring 1660aa7ab1e2SAlexander Aring if (recv_workqueue) 1661aa7ab1e2SAlexander Aring flush_workqueue(recv_workqueue); 1662aa7ab1e2SAlexander Aring if (send_workqueue) 1663aa7ab1e2SAlexander Aring flush_workqueue(send_workqueue); 1664aa7ab1e2SAlexander Aring 1665055923bfSAlexander Aring foreach_conn(shutdown_conn); 1666f0fb83cbStsutomu.owa@toshiba.co.jp work_flush(); 16673a8db798SMarcelo Ricardo Leitner foreach_conn(free_conn); 16686ed7257bSPatrick Caulfield work_stop(); 1669043697f0SAlexander Aring deinit_local(); 16706ed7257bSPatrick Caulfield } 16716ed7257bSPatrick Caulfield 16726ed7257bSPatrick Caulfield int dlm_lowcomms_start(void) 16736ed7257bSPatrick Caulfield { 16746ed7257bSPatrick Caulfield int error = -EINVAL; 16756ed7257bSPatrick Caulfield struct connection *con; 16765e9ccc37SChristine Caulfield int i; 16775e9ccc37SChristine Caulfield 16785e9ccc37SChristine Caulfield for (i = 0; i < CONN_HASH_SIZE; i++) 16795e9ccc37SChristine Caulfield INIT_HLIST_HEAD(&connection_hash[i]); 16806ed7257bSPatrick Caulfield 16816ed7257bSPatrick Caulfield init_local(); 16826ed7257bSPatrick Caulfield if (!dlm_local_count) { 1683617e82e1SDavid Teigland error = -ENOTCONN; 16846ed7257bSPatrick Caulfield log_print("no local IP address has been set"); 1685513ef596SDavid Teigland goto fail; 16866ed7257bSPatrick Caulfield } 16876ed7257bSPatrick Caulfield 1688513ef596SDavid Teigland error = work_start(); 1689513ef596SDavid Teigland if (error) 1690a47666ebSAlexander Aring goto fail; 1691513ef596SDavid Teigland 1692513ef596SDavid Teigland dlm_allow_conn = 1; 16936ed7257bSPatrick Caulfield 16946ed7257bSPatrick Caulfield /* Start listening */ 16956ed7257bSPatrick Caulfield if (dlm_config.ci_protocol == 0) 16966ed7257bSPatrick Caulfield error = tcp_listen_for_all(); 16976ed7257bSPatrick Caulfield else 16986ed7257bSPatrick Caulfield error = sctp_listen_for_all(); 16996ed7257bSPatrick Caulfield if (error) 17006ed7257bSPatrick Caulfield goto fail_unlisten; 17016ed7257bSPatrick Caulfield 17026ed7257bSPatrick Caulfield return 0; 17036ed7257bSPatrick Caulfield 17046ed7257bSPatrick Caulfield fail_unlisten: 1705513ef596SDavid Teigland dlm_allow_conn = 0; 17066ed7257bSPatrick Caulfield con = nodeid2con(0,0); 17077ae0451eSAlexander Aring if (con) 17087ae0451eSAlexander Aring free_conn(con); 1709513ef596SDavid Teigland fail: 17106ed7257bSPatrick Caulfield return error; 17116ed7257bSPatrick Caulfield } 171236b71a8bSDavid Teigland 171336b71a8bSDavid Teigland void dlm_lowcomms_exit(void) 171436b71a8bSDavid Teigland { 171536b71a8bSDavid Teigland struct dlm_node_addr *na, *safe; 171636b71a8bSDavid Teigland 171736b71a8bSDavid Teigland spin_lock(&dlm_node_addrs_spin); 171836b71a8bSDavid Teigland list_for_each_entry_safe(na, safe, &dlm_node_addrs, list) { 171936b71a8bSDavid Teigland list_del(&na->list); 172036b71a8bSDavid Teigland while (na->addr_count--) 172136b71a8bSDavid Teigland kfree(na->addr[na->addr_count]); 172236b71a8bSDavid Teigland kfree(na); 172336b71a8bSDavid Teigland } 172436b71a8bSDavid Teigland spin_unlock(&dlm_node_addrs_spin); 172536b71a8bSDavid Teigland } 1726