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 connection { 696ed7257bSPatrick Caulfield struct socket *sock; /* NULL if not connected */ 706ed7257bSPatrick Caulfield uint32_t nodeid; /* So we know who we are in the list */ 716ed7257bSPatrick Caulfield struct mutex sock_mutex; 726ed7257bSPatrick Caulfield unsigned long flags; 736ed7257bSPatrick Caulfield #define CF_READ_PENDING 1 748a4abb08Stsutomu.owa@toshiba.co.jp #define CF_WRITE_PENDING 2 756ed7257bSPatrick Caulfield #define CF_INIT_PENDING 4 766ed7257bSPatrick Caulfield #define CF_IS_OTHERCON 5 77063c4c99SLars Marowsky-Bree #define CF_CLOSE 6 78b36930ddSDavid Miller #define CF_APP_LIMITED 7 79b2a66629Stsutomu.owa@toshiba.co.jp #define CF_CLOSING 8 80055923bfSAlexander Aring #define CF_SHUTDOWN 9 8119633c7eSAlexander Aring #define CF_CONNECTED 10 826ed7257bSPatrick Caulfield struct list_head writequeue; /* List of outgoing writequeue_entries */ 836ed7257bSPatrick Caulfield spinlock_t writequeue_lock; 846ed7257bSPatrick Caulfield void (*connect_action) (struct connection *); /* What to do to connect */ 85055923bfSAlexander Aring void (*shutdown_action)(struct connection *con); /* What to do to shutdown */ 866ed7257bSPatrick Caulfield int retries; 876ed7257bSPatrick Caulfield #define MAX_CONNECT_RETRIES 3 885e9ccc37SChristine Caulfield struct hlist_node list; 896ed7257bSPatrick Caulfield struct connection *othercon; 906ed7257bSPatrick Caulfield struct work_struct rwork; /* Receive workqueue */ 916ed7257bSPatrick Caulfield struct work_struct swork; /* Send workqueue */ 92055923bfSAlexander Aring wait_queue_head_t shutdown_wait; /* wait for graceful shutdown */ 934798cbbfSAlexander Aring unsigned char *rx_buf; 944798cbbfSAlexander Aring int rx_buflen; 954798cbbfSAlexander Aring int rx_leftover; 96a47666ebSAlexander Aring struct rcu_head rcu; 976ed7257bSPatrick Caulfield }; 986ed7257bSPatrick Caulfield #define sock2con(x) ((struct connection *)(x)->sk_user_data) 996ed7257bSPatrick Caulfield 100d11ccd45SAlexander Aring struct listen_connection { 101d11ccd45SAlexander Aring struct socket *sock; 102d11ccd45SAlexander Aring struct work_struct rwork; 103d11ccd45SAlexander Aring }; 104d11ccd45SAlexander Aring 1056ed7257bSPatrick Caulfield /* An entry waiting to be sent */ 1066ed7257bSPatrick Caulfield struct writequeue_entry { 1076ed7257bSPatrick Caulfield struct list_head list; 1086ed7257bSPatrick Caulfield struct page *page; 1096ed7257bSPatrick Caulfield int offset; 1106ed7257bSPatrick Caulfield int len; 1116ed7257bSPatrick Caulfield int end; 1126ed7257bSPatrick Caulfield int users; 1136ed7257bSPatrick Caulfield struct connection *con; 1146ed7257bSPatrick Caulfield }; 1156ed7257bSPatrick Caulfield 11636b71a8bSDavid Teigland struct dlm_node_addr { 11736b71a8bSDavid Teigland struct list_head list; 11836b71a8bSDavid Teigland int nodeid; 11936b71a8bSDavid Teigland int addr_count; 12098e1b60eSMike Christie int curr_addr_index; 12136b71a8bSDavid Teigland struct sockaddr_storage *addr[DLM_MAX_ADDR_COUNT]; 12236b71a8bSDavid Teigland }; 12336b71a8bSDavid Teigland 124cc661fc9SBob Peterson static struct listen_sock_callbacks { 125cc661fc9SBob Peterson void (*sk_error_report)(struct sock *); 126cc661fc9SBob Peterson void (*sk_data_ready)(struct sock *); 127cc661fc9SBob Peterson void (*sk_state_change)(struct sock *); 128cc661fc9SBob Peterson void (*sk_write_space)(struct sock *); 129cc661fc9SBob Peterson } listen_sock; 130cc661fc9SBob Peterson 13136b71a8bSDavid Teigland static LIST_HEAD(dlm_node_addrs); 13236b71a8bSDavid Teigland static DEFINE_SPINLOCK(dlm_node_addrs_spin); 13336b71a8bSDavid Teigland 134d11ccd45SAlexander Aring static struct listen_connection listen_con; 1356ed7257bSPatrick Caulfield static struct sockaddr_storage *dlm_local_addr[DLM_MAX_ADDR_COUNT]; 1366ed7257bSPatrick Caulfield static int dlm_local_count; 137513ef596SDavid Teigland static int dlm_allow_conn; 1386ed7257bSPatrick Caulfield 1396ed7257bSPatrick Caulfield /* Work queues */ 1406ed7257bSPatrick Caulfield static struct workqueue_struct *recv_workqueue; 1416ed7257bSPatrick Caulfield static struct workqueue_struct *send_workqueue; 1426ed7257bSPatrick Caulfield 1435e9ccc37SChristine Caulfield static struct hlist_head connection_hash[CONN_HASH_SIZE]; 144a47666ebSAlexander Aring static DEFINE_SPINLOCK(connections_lock); 145a47666ebSAlexander Aring DEFINE_STATIC_SRCU(connections_srcu); 1466ed7257bSPatrick Caulfield 1476ed7257bSPatrick Caulfield static void process_recv_sockets(struct work_struct *work); 1486ed7257bSPatrick Caulfield static void process_send_sockets(struct work_struct *work); 1496ed7257bSPatrick Caulfield 1500672c3c2SAlexander Aring static void sctp_connect_to_sock(struct connection *con); 1510672c3c2SAlexander Aring static void tcp_connect_to_sock(struct connection *con); 15242873c90SAlexander Aring static void dlm_tcp_shutdown(struct connection *con); 1535e9ccc37SChristine Caulfield 1545e9ccc37SChristine Caulfield /* This is deliberately very simple because most clusters have simple 1555e9ccc37SChristine Caulfield sequential nodeids, so we should be able to go straight to a connection 1565e9ccc37SChristine Caulfield struct in the array */ 1575e9ccc37SChristine Caulfield static inline int nodeid_hash(int nodeid) 1585e9ccc37SChristine Caulfield { 1595e9ccc37SChristine Caulfield return nodeid & (CONN_HASH_SIZE-1); 1605e9ccc37SChristine Caulfield } 1615e9ccc37SChristine Caulfield 1625e9ccc37SChristine Caulfield static struct connection *__find_con(int nodeid) 1635e9ccc37SChristine Caulfield { 164a47666ebSAlexander Aring int r, idx; 1655e9ccc37SChristine Caulfield struct connection *con; 1665e9ccc37SChristine Caulfield 1675e9ccc37SChristine Caulfield r = nodeid_hash(nodeid); 1685e9ccc37SChristine Caulfield 169a47666ebSAlexander Aring idx = srcu_read_lock(&connections_srcu); 170a47666ebSAlexander Aring hlist_for_each_entry_rcu(con, &connection_hash[r], list) { 171a47666ebSAlexander Aring if (con->nodeid == nodeid) { 172a47666ebSAlexander Aring srcu_read_unlock(&connections_srcu, idx); 1735e9ccc37SChristine Caulfield return con; 1745e9ccc37SChristine Caulfield } 175a47666ebSAlexander Aring } 176a47666ebSAlexander Aring srcu_read_unlock(&connections_srcu, idx); 177a47666ebSAlexander Aring 1785e9ccc37SChristine Caulfield return NULL; 1795e9ccc37SChristine Caulfield } 1805e9ccc37SChristine Caulfield 1816cde210aSAlexander Aring static int dlm_con_init(struct connection *con, int nodeid) 1826ed7257bSPatrick Caulfield { 1834798cbbfSAlexander Aring con->rx_buflen = dlm_config.ci_buffer_size; 1844798cbbfSAlexander Aring con->rx_buf = kmalloc(con->rx_buflen, GFP_NOFS); 1856cde210aSAlexander Aring if (!con->rx_buf) 1866cde210aSAlexander Aring return -ENOMEM; 1874798cbbfSAlexander Aring 1886ed7257bSPatrick Caulfield con->nodeid = nodeid; 1896ed7257bSPatrick Caulfield mutex_init(&con->sock_mutex); 1906ed7257bSPatrick Caulfield INIT_LIST_HEAD(&con->writequeue); 1916ed7257bSPatrick Caulfield spin_lock_init(&con->writequeue_lock); 1926ed7257bSPatrick Caulfield INIT_WORK(&con->swork, process_send_sockets); 1936ed7257bSPatrick Caulfield INIT_WORK(&con->rwork, process_recv_sockets); 194055923bfSAlexander Aring init_waitqueue_head(&con->shutdown_wait); 1956ed7257bSPatrick Caulfield 19642873c90SAlexander Aring if (dlm_config.ci_protocol == 0) { 1970672c3c2SAlexander Aring con->connect_action = tcp_connect_to_sock; 19842873c90SAlexander Aring con->shutdown_action = dlm_tcp_shutdown; 19942873c90SAlexander Aring } else { 2000672c3c2SAlexander Aring con->connect_action = sctp_connect_to_sock; 20142873c90SAlexander Aring } 2026ed7257bSPatrick Caulfield 2036cde210aSAlexander Aring return 0; 2046cde210aSAlexander Aring } 2056cde210aSAlexander Aring 2066cde210aSAlexander Aring /* 2076cde210aSAlexander Aring * If 'allocation' is zero then we don't attempt to create a new 2086cde210aSAlexander Aring * connection structure for this node. 2096cde210aSAlexander Aring */ 2106cde210aSAlexander Aring static struct connection *nodeid2con(int nodeid, gfp_t alloc) 2116cde210aSAlexander Aring { 2126cde210aSAlexander Aring struct connection *con, *tmp; 2136cde210aSAlexander Aring int r, ret; 2146cde210aSAlexander Aring 2156cde210aSAlexander Aring con = __find_con(nodeid); 2166cde210aSAlexander Aring if (con || !alloc) 2176cde210aSAlexander Aring return con; 2186cde210aSAlexander Aring 2196cde210aSAlexander Aring con = kzalloc(sizeof(*con), alloc); 2206cde210aSAlexander Aring if (!con) 2216cde210aSAlexander Aring return NULL; 2226cde210aSAlexander Aring 2236cde210aSAlexander Aring ret = dlm_con_init(con, nodeid); 2246cde210aSAlexander Aring if (ret) { 2256cde210aSAlexander Aring kfree(con); 2266cde210aSAlexander Aring return NULL; 2276cde210aSAlexander Aring } 2286cde210aSAlexander Aring 229a47666ebSAlexander Aring r = nodeid_hash(nodeid); 230a47666ebSAlexander Aring 231a47666ebSAlexander Aring spin_lock(&connections_lock); 2324f2b30fdSAlexander Aring /* Because multiple workqueues/threads calls this function it can 2334f2b30fdSAlexander Aring * race on multiple cpu's. Instead of locking hot path __find_con() 2344f2b30fdSAlexander Aring * we just check in rare cases of recently added nodes again 2354f2b30fdSAlexander Aring * under protection of connections_lock. If this is the case we 2364f2b30fdSAlexander Aring * abort our connection creation and return the existing connection. 2374f2b30fdSAlexander Aring */ 2384f2b30fdSAlexander Aring tmp = __find_con(nodeid); 2394f2b30fdSAlexander Aring if (tmp) { 2404f2b30fdSAlexander Aring spin_unlock(&connections_lock); 2414f2b30fdSAlexander Aring kfree(con->rx_buf); 2424f2b30fdSAlexander Aring kfree(con); 2434f2b30fdSAlexander Aring return tmp; 2444f2b30fdSAlexander Aring } 2454f2b30fdSAlexander Aring 246a47666ebSAlexander Aring hlist_add_head_rcu(&con->list, &connection_hash[r]); 247a47666ebSAlexander Aring spin_unlock(&connections_lock); 248a47666ebSAlexander Aring 2496ed7257bSPatrick Caulfield return con; 2506ed7257bSPatrick Caulfield } 2516ed7257bSPatrick Caulfield 2525e9ccc37SChristine Caulfield /* Loop round all connections */ 2535e9ccc37SChristine Caulfield static void foreach_conn(void (*conn_func)(struct connection *c)) 2545e9ccc37SChristine Caulfield { 255a47666ebSAlexander Aring int i, idx; 2565e9ccc37SChristine Caulfield struct connection *con; 2575e9ccc37SChristine Caulfield 258a47666ebSAlexander Aring idx = srcu_read_lock(&connections_srcu); 2595e9ccc37SChristine Caulfield for (i = 0; i < CONN_HASH_SIZE; i++) { 260a47666ebSAlexander Aring hlist_for_each_entry_rcu(con, &connection_hash[i], list) 2615e9ccc37SChristine Caulfield conn_func(con); 2625e9ccc37SChristine Caulfield } 263a47666ebSAlexander Aring srcu_read_unlock(&connections_srcu, idx); 2646ed7257bSPatrick Caulfield } 2656ed7257bSPatrick Caulfield 26636b71a8bSDavid Teigland static struct dlm_node_addr *find_node_addr(int nodeid) 2676ed7257bSPatrick Caulfield { 26836b71a8bSDavid Teigland struct dlm_node_addr *na; 26936b71a8bSDavid Teigland 27036b71a8bSDavid Teigland list_for_each_entry(na, &dlm_node_addrs, list) { 27136b71a8bSDavid Teigland if (na->nodeid == nodeid) 27236b71a8bSDavid Teigland return na; 27336b71a8bSDavid Teigland } 27436b71a8bSDavid Teigland return NULL; 27536b71a8bSDavid Teigland } 27636b71a8bSDavid Teigland 27740c6b83eSAlexander Aring static int addr_compare(const struct sockaddr_storage *x, 27840c6b83eSAlexander Aring const struct sockaddr_storage *y) 27936b71a8bSDavid Teigland { 28036b71a8bSDavid Teigland switch (x->ss_family) { 28136b71a8bSDavid Teigland case AF_INET: { 28236b71a8bSDavid Teigland struct sockaddr_in *sinx = (struct sockaddr_in *)x; 28336b71a8bSDavid Teigland struct sockaddr_in *siny = (struct sockaddr_in *)y; 28436b71a8bSDavid Teigland if (sinx->sin_addr.s_addr != siny->sin_addr.s_addr) 28536b71a8bSDavid Teigland return 0; 28636b71a8bSDavid Teigland if (sinx->sin_port != siny->sin_port) 28736b71a8bSDavid Teigland return 0; 28836b71a8bSDavid Teigland break; 28936b71a8bSDavid Teigland } 29036b71a8bSDavid Teigland case AF_INET6: { 29136b71a8bSDavid Teigland struct sockaddr_in6 *sinx = (struct sockaddr_in6 *)x; 29236b71a8bSDavid Teigland struct sockaddr_in6 *siny = (struct sockaddr_in6 *)y; 29336b71a8bSDavid Teigland if (!ipv6_addr_equal(&sinx->sin6_addr, &siny->sin6_addr)) 29436b71a8bSDavid Teigland return 0; 29536b71a8bSDavid Teigland if (sinx->sin6_port != siny->sin6_port) 29636b71a8bSDavid Teigland return 0; 29736b71a8bSDavid Teigland break; 29836b71a8bSDavid Teigland } 29936b71a8bSDavid Teigland default: 30036b71a8bSDavid Teigland return 0; 30136b71a8bSDavid Teigland } 30236b71a8bSDavid Teigland return 1; 30336b71a8bSDavid Teigland } 30436b71a8bSDavid Teigland 30536b71a8bSDavid Teigland static int nodeid_to_addr(int nodeid, struct sockaddr_storage *sas_out, 30698e1b60eSMike Christie struct sockaddr *sa_out, bool try_new_addr) 30736b71a8bSDavid Teigland { 30836b71a8bSDavid Teigland struct sockaddr_storage sas; 30936b71a8bSDavid Teigland struct dlm_node_addr *na; 3106ed7257bSPatrick Caulfield 3116ed7257bSPatrick Caulfield if (!dlm_local_count) 3126ed7257bSPatrick Caulfield return -1; 3136ed7257bSPatrick Caulfield 31436b71a8bSDavid Teigland spin_lock(&dlm_node_addrs_spin); 31536b71a8bSDavid Teigland na = find_node_addr(nodeid); 31698e1b60eSMike Christie if (na && na->addr_count) { 317ee44b4bcSMarcelo Ricardo Leitner memcpy(&sas, na->addr[na->curr_addr_index], 318ee44b4bcSMarcelo Ricardo Leitner sizeof(struct sockaddr_storage)); 319ee44b4bcSMarcelo Ricardo Leitner 32098e1b60eSMike Christie if (try_new_addr) { 32198e1b60eSMike Christie na->curr_addr_index++; 32298e1b60eSMike Christie if (na->curr_addr_index == na->addr_count) 32398e1b60eSMike Christie na->curr_addr_index = 0; 32498e1b60eSMike Christie } 32598e1b60eSMike Christie } 32636b71a8bSDavid Teigland spin_unlock(&dlm_node_addrs_spin); 32736b71a8bSDavid Teigland 32836b71a8bSDavid Teigland if (!na) 32936b71a8bSDavid Teigland return -EEXIST; 33036b71a8bSDavid Teigland 33136b71a8bSDavid Teigland if (!na->addr_count) 33236b71a8bSDavid Teigland return -ENOENT; 33336b71a8bSDavid Teigland 33436b71a8bSDavid Teigland if (sas_out) 33536b71a8bSDavid Teigland memcpy(sas_out, &sas, sizeof(struct sockaddr_storage)); 33636b71a8bSDavid Teigland 33736b71a8bSDavid Teigland if (!sa_out) 33836b71a8bSDavid Teigland return 0; 3396ed7257bSPatrick Caulfield 3406ed7257bSPatrick Caulfield if (dlm_local_addr[0]->ss_family == AF_INET) { 34136b71a8bSDavid Teigland struct sockaddr_in *in4 = (struct sockaddr_in *) &sas; 34236b71a8bSDavid Teigland struct sockaddr_in *ret4 = (struct sockaddr_in *) sa_out; 3436ed7257bSPatrick Caulfield ret4->sin_addr.s_addr = in4->sin_addr.s_addr; 3446ed7257bSPatrick Caulfield } else { 34536b71a8bSDavid Teigland struct sockaddr_in6 *in6 = (struct sockaddr_in6 *) &sas; 34636b71a8bSDavid Teigland struct sockaddr_in6 *ret6 = (struct sockaddr_in6 *) sa_out; 3474e3fd7a0SAlexey Dobriyan ret6->sin6_addr = in6->sin6_addr; 3486ed7257bSPatrick Caulfield } 3496ed7257bSPatrick Caulfield 3506ed7257bSPatrick Caulfield return 0; 3516ed7257bSPatrick Caulfield } 3526ed7257bSPatrick Caulfield 35336b71a8bSDavid Teigland static int addr_to_nodeid(struct sockaddr_storage *addr, int *nodeid) 35436b71a8bSDavid Teigland { 35536b71a8bSDavid Teigland struct dlm_node_addr *na; 35636b71a8bSDavid Teigland int rv = -EEXIST; 35798e1b60eSMike Christie int addr_i; 35836b71a8bSDavid Teigland 35936b71a8bSDavid Teigland spin_lock(&dlm_node_addrs_spin); 36036b71a8bSDavid Teigland list_for_each_entry(na, &dlm_node_addrs, list) { 36136b71a8bSDavid Teigland if (!na->addr_count) 36236b71a8bSDavid Teigland continue; 36336b71a8bSDavid Teigland 36498e1b60eSMike Christie for (addr_i = 0; addr_i < na->addr_count; addr_i++) { 36598e1b60eSMike Christie if (addr_compare(na->addr[addr_i], addr)) { 36636b71a8bSDavid Teigland *nodeid = na->nodeid; 36736b71a8bSDavid Teigland rv = 0; 36898e1b60eSMike Christie goto unlock; 36936b71a8bSDavid Teigland } 37098e1b60eSMike Christie } 37198e1b60eSMike Christie } 37298e1b60eSMike Christie unlock: 37336b71a8bSDavid Teigland spin_unlock(&dlm_node_addrs_spin); 37436b71a8bSDavid Teigland return rv; 37536b71a8bSDavid Teigland } 37636b71a8bSDavid Teigland 377*4f19d071SAlexander Aring /* caller need to held dlm_node_addrs_spin lock */ 378*4f19d071SAlexander Aring static bool dlm_lowcomms_na_has_addr(const struct dlm_node_addr *na, 379*4f19d071SAlexander Aring const struct sockaddr_storage *addr) 380*4f19d071SAlexander Aring { 381*4f19d071SAlexander Aring int i; 382*4f19d071SAlexander Aring 383*4f19d071SAlexander Aring for (i = 0; i < na->addr_count; i++) { 384*4f19d071SAlexander Aring if (addr_compare(na->addr[i], addr)) 385*4f19d071SAlexander Aring return true; 386*4f19d071SAlexander Aring } 387*4f19d071SAlexander Aring 388*4f19d071SAlexander Aring return false; 389*4f19d071SAlexander Aring } 390*4f19d071SAlexander Aring 39136b71a8bSDavid Teigland int dlm_lowcomms_addr(int nodeid, struct sockaddr_storage *addr, int len) 39236b71a8bSDavid Teigland { 39336b71a8bSDavid Teigland struct sockaddr_storage *new_addr; 39436b71a8bSDavid Teigland struct dlm_node_addr *new_node, *na; 395*4f19d071SAlexander Aring bool ret; 39636b71a8bSDavid Teigland 39736b71a8bSDavid Teigland new_node = kzalloc(sizeof(struct dlm_node_addr), GFP_NOFS); 39836b71a8bSDavid Teigland if (!new_node) 39936b71a8bSDavid Teigland return -ENOMEM; 40036b71a8bSDavid Teigland 40136b71a8bSDavid Teigland new_addr = kzalloc(sizeof(struct sockaddr_storage), GFP_NOFS); 40236b71a8bSDavid Teigland if (!new_addr) { 40336b71a8bSDavid Teigland kfree(new_node); 40436b71a8bSDavid Teigland return -ENOMEM; 40536b71a8bSDavid Teigland } 40636b71a8bSDavid Teigland 40736b71a8bSDavid Teigland memcpy(new_addr, addr, len); 40836b71a8bSDavid Teigland 40936b71a8bSDavid Teigland spin_lock(&dlm_node_addrs_spin); 41036b71a8bSDavid Teigland na = find_node_addr(nodeid); 41136b71a8bSDavid Teigland if (!na) { 41236b71a8bSDavid Teigland new_node->nodeid = nodeid; 41336b71a8bSDavid Teigland new_node->addr[0] = new_addr; 41436b71a8bSDavid Teigland new_node->addr_count = 1; 41536b71a8bSDavid Teigland list_add(&new_node->list, &dlm_node_addrs); 41636b71a8bSDavid Teigland spin_unlock(&dlm_node_addrs_spin); 41736b71a8bSDavid Teigland return 0; 41836b71a8bSDavid Teigland } 41936b71a8bSDavid Teigland 420*4f19d071SAlexander Aring ret = dlm_lowcomms_na_has_addr(na, addr); 421*4f19d071SAlexander Aring if (ret) { 422*4f19d071SAlexander Aring spin_unlock(&dlm_node_addrs_spin); 423*4f19d071SAlexander Aring kfree(new_addr); 424*4f19d071SAlexander Aring kfree(new_node); 425*4f19d071SAlexander Aring return -EEXIST; 426*4f19d071SAlexander Aring } 427*4f19d071SAlexander Aring 42836b71a8bSDavid Teigland if (na->addr_count >= DLM_MAX_ADDR_COUNT) { 42936b71a8bSDavid Teigland spin_unlock(&dlm_node_addrs_spin); 43036b71a8bSDavid Teigland kfree(new_addr); 43136b71a8bSDavid Teigland kfree(new_node); 43236b71a8bSDavid Teigland return -ENOSPC; 43336b71a8bSDavid Teigland } 43436b71a8bSDavid Teigland 43536b71a8bSDavid Teigland na->addr[na->addr_count++] = new_addr; 43636b71a8bSDavid Teigland spin_unlock(&dlm_node_addrs_spin); 43736b71a8bSDavid Teigland kfree(new_node); 43836b71a8bSDavid Teigland return 0; 43936b71a8bSDavid Teigland } 44036b71a8bSDavid Teigland 4416ed7257bSPatrick Caulfield /* Data available on socket or listen socket received a connect */ 442676d2369SDavid S. Miller static void lowcomms_data_ready(struct sock *sk) 4436ed7257bSPatrick Caulfield { 44493eaadebStsutomu.owa@toshiba.co.jp struct connection *con; 44593eaadebStsutomu.owa@toshiba.co.jp 44693eaadebStsutomu.owa@toshiba.co.jp read_lock_bh(&sk->sk_callback_lock); 44793eaadebStsutomu.owa@toshiba.co.jp con = sock2con(sk); 448afb853fbSPatrick Caulfield if (con && !test_and_set_bit(CF_READ_PENDING, &con->flags)) 4496ed7257bSPatrick Caulfield queue_work(recv_workqueue, &con->rwork); 45093eaadebStsutomu.owa@toshiba.co.jp read_unlock_bh(&sk->sk_callback_lock); 4516ed7257bSPatrick Caulfield } 4526ed7257bSPatrick Caulfield 453d11ccd45SAlexander Aring static void lowcomms_listen_data_ready(struct sock *sk) 454d11ccd45SAlexander Aring { 455d11ccd45SAlexander Aring queue_work(recv_workqueue, &listen_con.rwork); 456d11ccd45SAlexander Aring } 457d11ccd45SAlexander Aring 4586ed7257bSPatrick Caulfield static void lowcomms_write_space(struct sock *sk) 4596ed7257bSPatrick Caulfield { 46093eaadebStsutomu.owa@toshiba.co.jp struct connection *con; 4616ed7257bSPatrick Caulfield 46293eaadebStsutomu.owa@toshiba.co.jp read_lock_bh(&sk->sk_callback_lock); 46393eaadebStsutomu.owa@toshiba.co.jp con = sock2con(sk); 464b36930ddSDavid Miller if (!con) 46593eaadebStsutomu.owa@toshiba.co.jp goto out; 466b36930ddSDavid Miller 46719633c7eSAlexander Aring if (!test_and_set_bit(CF_CONNECTED, &con->flags)) { 46819633c7eSAlexander Aring log_print("successful connected to node %d", con->nodeid); 46919633c7eSAlexander Aring queue_work(send_workqueue, &con->swork); 47019633c7eSAlexander Aring goto out; 47119633c7eSAlexander Aring } 47219633c7eSAlexander Aring 473b36930ddSDavid Miller clear_bit(SOCK_NOSPACE, &con->sock->flags); 474b36930ddSDavid Miller 475b36930ddSDavid Miller if (test_and_clear_bit(CF_APP_LIMITED, &con->flags)) { 476b36930ddSDavid Miller con->sock->sk->sk_write_pending--; 4779cd3e072SEric Dumazet clear_bit(SOCKWQ_ASYNC_NOSPACE, &con->sock->flags); 478b36930ddSDavid Miller } 479b36930ddSDavid Miller 4806ed7257bSPatrick Caulfield queue_work(send_workqueue, &con->swork); 48193eaadebStsutomu.owa@toshiba.co.jp out: 48293eaadebStsutomu.owa@toshiba.co.jp read_unlock_bh(&sk->sk_callback_lock); 4836ed7257bSPatrick Caulfield } 4846ed7257bSPatrick Caulfield 4856ed7257bSPatrick Caulfield static inline void lowcomms_connect_sock(struct connection *con) 4866ed7257bSPatrick Caulfield { 487063c4c99SLars Marowsky-Bree if (test_bit(CF_CLOSE, &con->flags)) 488063c4c99SLars Marowsky-Bree return; 4896ed7257bSPatrick Caulfield queue_work(send_workqueue, &con->swork); 49061d9102bSBob Peterson cond_resched(); 4916ed7257bSPatrick Caulfield } 4926ed7257bSPatrick Caulfield 4936ed7257bSPatrick Caulfield static void lowcomms_state_change(struct sock *sk) 4946ed7257bSPatrick Caulfield { 495ee44b4bcSMarcelo Ricardo Leitner /* SCTP layer is not calling sk_data_ready when the connection 496ee44b4bcSMarcelo Ricardo Leitner * is done, so we catch the signal through here. Also, it 497ee44b4bcSMarcelo Ricardo Leitner * doesn't switch socket state when entering shutdown, so we 498ee44b4bcSMarcelo Ricardo Leitner * skip the write in that case. 499ee44b4bcSMarcelo Ricardo Leitner */ 500ee44b4bcSMarcelo Ricardo Leitner if (sk->sk_shutdown) { 501ee44b4bcSMarcelo Ricardo Leitner if (sk->sk_shutdown == RCV_SHUTDOWN) 502ee44b4bcSMarcelo Ricardo Leitner lowcomms_data_ready(sk); 503ee44b4bcSMarcelo Ricardo Leitner } else if (sk->sk_state == TCP_ESTABLISHED) { 5046ed7257bSPatrick Caulfield lowcomms_write_space(sk); 5056ed7257bSPatrick Caulfield } 506ee44b4bcSMarcelo Ricardo Leitner } 5076ed7257bSPatrick Caulfield 508391fbdc5SChristine Caulfield int dlm_lowcomms_connect_node(int nodeid) 509391fbdc5SChristine Caulfield { 510391fbdc5SChristine Caulfield struct connection *con; 511391fbdc5SChristine Caulfield 512391fbdc5SChristine Caulfield if (nodeid == dlm_our_nodeid()) 513391fbdc5SChristine Caulfield return 0; 514391fbdc5SChristine Caulfield 515391fbdc5SChristine Caulfield con = nodeid2con(nodeid, GFP_NOFS); 516391fbdc5SChristine Caulfield if (!con) 517391fbdc5SChristine Caulfield return -ENOMEM; 518391fbdc5SChristine Caulfield lowcomms_connect_sock(con); 519391fbdc5SChristine Caulfield return 0; 520391fbdc5SChristine Caulfield } 521391fbdc5SChristine Caulfield 522b3a5bbfdSBob Peterson static void lowcomms_error_report(struct sock *sk) 523b3a5bbfdSBob Peterson { 524b81171cbSBob Peterson struct connection *con; 525b3a5bbfdSBob Peterson struct sockaddr_storage saddr; 526b81171cbSBob Peterson void (*orig_report)(struct sock *) = NULL; 527b3a5bbfdSBob Peterson 528b81171cbSBob Peterson read_lock_bh(&sk->sk_callback_lock); 529b81171cbSBob Peterson con = sock2con(sk); 530b81171cbSBob Peterson if (con == NULL) 531b81171cbSBob Peterson goto out; 532b81171cbSBob Peterson 533cc661fc9SBob Peterson orig_report = listen_sock.sk_error_report; 5341a31833dSBob Peterson if (con->sock == NULL || 5359b2c45d4SDenys Vlasenko kernel_getpeername(con->sock, (struct sockaddr *)&saddr) < 0) { 536b3a5bbfdSBob Peterson printk_ratelimited(KERN_ERR "dlm: node %d: socket error " 537b3a5bbfdSBob Peterson "sending to node %d, port %d, " 538b3a5bbfdSBob Peterson "sk_err=%d/%d\n", dlm_our_nodeid(), 539b3a5bbfdSBob Peterson con->nodeid, dlm_config.ci_tcp_port, 540b3a5bbfdSBob Peterson sk->sk_err, sk->sk_err_soft); 541b3a5bbfdSBob Peterson } else if (saddr.ss_family == AF_INET) { 542b3a5bbfdSBob Peterson struct sockaddr_in *sin4 = (struct sockaddr_in *)&saddr; 543b3a5bbfdSBob Peterson 544b3a5bbfdSBob Peterson printk_ratelimited(KERN_ERR "dlm: node %d: socket error " 545b3a5bbfdSBob Peterson "sending to node %d at %pI4, port %d, " 546b3a5bbfdSBob Peterson "sk_err=%d/%d\n", dlm_our_nodeid(), 547b3a5bbfdSBob Peterson con->nodeid, &sin4->sin_addr.s_addr, 548b3a5bbfdSBob Peterson dlm_config.ci_tcp_port, sk->sk_err, 549b3a5bbfdSBob Peterson sk->sk_err_soft); 550b3a5bbfdSBob Peterson } else { 551b3a5bbfdSBob Peterson struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&saddr; 552b3a5bbfdSBob Peterson 553b3a5bbfdSBob Peterson printk_ratelimited(KERN_ERR "dlm: node %d: socket error " 554b3a5bbfdSBob Peterson "sending to node %d at %u.%u.%u.%u, " 555b3a5bbfdSBob Peterson "port %d, sk_err=%d/%d\n", dlm_our_nodeid(), 556b3a5bbfdSBob Peterson con->nodeid, sin6->sin6_addr.s6_addr32[0], 557b3a5bbfdSBob Peterson sin6->sin6_addr.s6_addr32[1], 558b3a5bbfdSBob Peterson sin6->sin6_addr.s6_addr32[2], 559b3a5bbfdSBob Peterson sin6->sin6_addr.s6_addr32[3], 560b3a5bbfdSBob Peterson dlm_config.ci_tcp_port, sk->sk_err, 561b3a5bbfdSBob Peterson sk->sk_err_soft); 562b3a5bbfdSBob Peterson } 563b81171cbSBob Peterson out: 564b81171cbSBob Peterson read_unlock_bh(&sk->sk_callback_lock); 565b81171cbSBob Peterson if (orig_report) 566b81171cbSBob Peterson orig_report(sk); 567b81171cbSBob Peterson } 568b81171cbSBob Peterson 569b81171cbSBob Peterson /* Note: sk_callback_lock must be locked before calling this function. */ 570cc661fc9SBob Peterson static void save_listen_callbacks(struct socket *sock) 571b81171cbSBob Peterson { 572cc661fc9SBob Peterson struct sock *sk = sock->sk; 573cc661fc9SBob Peterson 574cc661fc9SBob Peterson listen_sock.sk_data_ready = sk->sk_data_ready; 575cc661fc9SBob Peterson listen_sock.sk_state_change = sk->sk_state_change; 576cc661fc9SBob Peterson listen_sock.sk_write_space = sk->sk_write_space; 577cc661fc9SBob Peterson listen_sock.sk_error_report = sk->sk_error_report; 578b81171cbSBob Peterson } 579b81171cbSBob Peterson 580cc661fc9SBob Peterson static void restore_callbacks(struct socket *sock) 581b81171cbSBob Peterson { 582cc661fc9SBob Peterson struct sock *sk = sock->sk; 583cc661fc9SBob Peterson 584b81171cbSBob Peterson write_lock_bh(&sk->sk_callback_lock); 585b81171cbSBob Peterson sk->sk_user_data = NULL; 586cc661fc9SBob Peterson sk->sk_data_ready = listen_sock.sk_data_ready; 587cc661fc9SBob Peterson sk->sk_state_change = listen_sock.sk_state_change; 588cc661fc9SBob Peterson sk->sk_write_space = listen_sock.sk_write_space; 589cc661fc9SBob Peterson sk->sk_error_report = listen_sock.sk_error_report; 590b81171cbSBob Peterson write_unlock_bh(&sk->sk_callback_lock); 591b3a5bbfdSBob Peterson } 592b3a5bbfdSBob Peterson 593d11ccd45SAlexander Aring static void add_listen_sock(struct socket *sock, struct listen_connection *con) 594d11ccd45SAlexander Aring { 595d11ccd45SAlexander Aring struct sock *sk = sock->sk; 596d11ccd45SAlexander Aring 597d11ccd45SAlexander Aring write_lock_bh(&sk->sk_callback_lock); 598d11ccd45SAlexander Aring save_listen_callbacks(sock); 599d11ccd45SAlexander Aring con->sock = sock; 600d11ccd45SAlexander Aring 601d11ccd45SAlexander Aring sk->sk_user_data = con; 602d11ccd45SAlexander Aring sk->sk_allocation = GFP_NOFS; 603d11ccd45SAlexander Aring /* Install a data_ready callback */ 604d11ccd45SAlexander Aring sk->sk_data_ready = lowcomms_listen_data_ready; 605d11ccd45SAlexander Aring write_unlock_bh(&sk->sk_callback_lock); 606d11ccd45SAlexander Aring } 607d11ccd45SAlexander Aring 6086ed7257bSPatrick Caulfield /* Make a socket active */ 609988419a9Stsutomu.owa@toshiba.co.jp static void add_sock(struct socket *sock, struct connection *con) 6106ed7257bSPatrick Caulfield { 611b81171cbSBob Peterson struct sock *sk = sock->sk; 612b81171cbSBob Peterson 613b81171cbSBob Peterson write_lock_bh(&sk->sk_callback_lock); 6146ed7257bSPatrick Caulfield con->sock = sock; 6156ed7257bSPatrick Caulfield 616b81171cbSBob Peterson sk->sk_user_data = con; 6176ed7257bSPatrick Caulfield /* Install a data_ready callback */ 618b81171cbSBob Peterson sk->sk_data_ready = lowcomms_data_ready; 619b81171cbSBob Peterson sk->sk_write_space = lowcomms_write_space; 620b81171cbSBob Peterson sk->sk_state_change = lowcomms_state_change; 621b81171cbSBob Peterson sk->sk_allocation = GFP_NOFS; 622b81171cbSBob Peterson sk->sk_error_report = lowcomms_error_report; 623b81171cbSBob Peterson write_unlock_bh(&sk->sk_callback_lock); 6246ed7257bSPatrick Caulfield } 6256ed7257bSPatrick Caulfield 6266ed7257bSPatrick Caulfield /* Add the port number to an IPv6 or 4 sockaddr and return the address 6276ed7257bSPatrick Caulfield length */ 6286ed7257bSPatrick Caulfield static void make_sockaddr(struct sockaddr_storage *saddr, uint16_t port, 6296ed7257bSPatrick Caulfield int *addr_len) 6306ed7257bSPatrick Caulfield { 6316ed7257bSPatrick Caulfield saddr->ss_family = dlm_local_addr[0]->ss_family; 6326ed7257bSPatrick Caulfield if (saddr->ss_family == AF_INET) { 6336ed7257bSPatrick Caulfield struct sockaddr_in *in4_addr = (struct sockaddr_in *)saddr; 6346ed7257bSPatrick Caulfield in4_addr->sin_port = cpu_to_be16(port); 6356ed7257bSPatrick Caulfield *addr_len = sizeof(struct sockaddr_in); 6366ed7257bSPatrick Caulfield memset(&in4_addr->sin_zero, 0, sizeof(in4_addr->sin_zero)); 6376ed7257bSPatrick Caulfield } else { 6386ed7257bSPatrick Caulfield struct sockaddr_in6 *in6_addr = (struct sockaddr_in6 *)saddr; 6396ed7257bSPatrick Caulfield in6_addr->sin6_port = cpu_to_be16(port); 6406ed7257bSPatrick Caulfield *addr_len = sizeof(struct sockaddr_in6); 6416ed7257bSPatrick Caulfield } 64201c8cab2SPatrick Caulfield memset((char *)saddr + *addr_len, 0, sizeof(struct sockaddr_storage) - *addr_len); 6436ed7257bSPatrick Caulfield } 6446ed7257bSPatrick Caulfield 645d11ccd45SAlexander Aring static void dlm_close_sock(struct socket **sock) 646d11ccd45SAlexander Aring { 647d11ccd45SAlexander Aring if (*sock) { 648d11ccd45SAlexander Aring restore_callbacks(*sock); 649d11ccd45SAlexander Aring sock_release(*sock); 650d11ccd45SAlexander Aring *sock = NULL; 651d11ccd45SAlexander Aring } 652d11ccd45SAlexander Aring } 653d11ccd45SAlexander Aring 6546ed7257bSPatrick Caulfield /* Close a remote connection and tidy up */ 6550d737a8cSMarcelo Ricardo Leitner static void close_connection(struct connection *con, bool and_other, 6560d737a8cSMarcelo Ricardo Leitner bool tx, bool rx) 6576ed7257bSPatrick Caulfield { 658b2a66629Stsutomu.owa@toshiba.co.jp bool closing = test_and_set_bit(CF_CLOSING, &con->flags); 659b2a66629Stsutomu.owa@toshiba.co.jp 6600aa18464Stsutomu.owa@toshiba.co.jp if (tx && !closing && cancel_work_sync(&con->swork)) { 6610d737a8cSMarcelo Ricardo Leitner log_print("canceled swork for node %d", con->nodeid); 6620aa18464Stsutomu.owa@toshiba.co.jp clear_bit(CF_WRITE_PENDING, &con->flags); 6630aa18464Stsutomu.owa@toshiba.co.jp } 6640aa18464Stsutomu.owa@toshiba.co.jp if (rx && !closing && cancel_work_sync(&con->rwork)) { 6650d737a8cSMarcelo Ricardo Leitner log_print("canceled rwork for node %d", con->nodeid); 6660aa18464Stsutomu.owa@toshiba.co.jp clear_bit(CF_READ_PENDING, &con->flags); 6670aa18464Stsutomu.owa@toshiba.co.jp } 6686ed7257bSPatrick Caulfield 6690d737a8cSMarcelo Ricardo Leitner mutex_lock(&con->sock_mutex); 670d11ccd45SAlexander Aring dlm_close_sock(&con->sock); 671d11ccd45SAlexander Aring 6726ed7257bSPatrick Caulfield if (con->othercon && and_other) { 6736ed7257bSPatrick Caulfield /* Will only re-enter once. */ 6740d737a8cSMarcelo Ricardo Leitner close_connection(con->othercon, false, true, true); 6756ed7257bSPatrick Caulfield } 6769e5f2825SPatrick Caulfield 6774798cbbfSAlexander Aring con->rx_leftover = 0; 6786ed7257bSPatrick Caulfield con->retries = 0; 67919633c7eSAlexander Aring clear_bit(CF_CONNECTED, &con->flags); 6806ed7257bSPatrick Caulfield mutex_unlock(&con->sock_mutex); 681b2a66629Stsutomu.owa@toshiba.co.jp clear_bit(CF_CLOSING, &con->flags); 6826ed7257bSPatrick Caulfield } 6836ed7257bSPatrick Caulfield 684055923bfSAlexander Aring static void shutdown_connection(struct connection *con) 685055923bfSAlexander Aring { 686055923bfSAlexander Aring int ret; 687055923bfSAlexander Aring 688055923bfSAlexander Aring if (cancel_work_sync(&con->swork)) { 689055923bfSAlexander Aring log_print("canceled swork for node %d", con->nodeid); 690055923bfSAlexander Aring clear_bit(CF_WRITE_PENDING, &con->flags); 691055923bfSAlexander Aring } 692055923bfSAlexander Aring 693055923bfSAlexander Aring mutex_lock(&con->sock_mutex); 694055923bfSAlexander Aring /* nothing to shutdown */ 695055923bfSAlexander Aring if (!con->sock) { 696055923bfSAlexander Aring mutex_unlock(&con->sock_mutex); 697055923bfSAlexander Aring return; 698055923bfSAlexander Aring } 699055923bfSAlexander Aring 700055923bfSAlexander Aring set_bit(CF_SHUTDOWN, &con->flags); 701055923bfSAlexander Aring ret = kernel_sock_shutdown(con->sock, SHUT_WR); 702055923bfSAlexander Aring mutex_unlock(&con->sock_mutex); 703055923bfSAlexander Aring if (ret) { 704055923bfSAlexander Aring log_print("Connection %p failed to shutdown: %d will force close", 705055923bfSAlexander Aring con, ret); 706055923bfSAlexander Aring goto force_close; 707055923bfSAlexander Aring } else { 708055923bfSAlexander Aring ret = wait_event_timeout(con->shutdown_wait, 709055923bfSAlexander Aring !test_bit(CF_SHUTDOWN, &con->flags), 710055923bfSAlexander Aring DLM_SHUTDOWN_WAIT_TIMEOUT); 711055923bfSAlexander Aring if (ret == 0) { 712055923bfSAlexander Aring log_print("Connection %p shutdown timed out, will force close", 713055923bfSAlexander Aring con); 714055923bfSAlexander Aring goto force_close; 715055923bfSAlexander Aring } 716055923bfSAlexander Aring } 717055923bfSAlexander Aring 718055923bfSAlexander Aring return; 719055923bfSAlexander Aring 720055923bfSAlexander Aring force_close: 721055923bfSAlexander Aring clear_bit(CF_SHUTDOWN, &con->flags); 722055923bfSAlexander Aring close_connection(con, false, true, true); 723055923bfSAlexander Aring } 724055923bfSAlexander Aring 725055923bfSAlexander Aring static void dlm_tcp_shutdown(struct connection *con) 726055923bfSAlexander Aring { 727055923bfSAlexander Aring if (con->othercon) 728055923bfSAlexander Aring shutdown_connection(con->othercon); 729055923bfSAlexander Aring shutdown_connection(con); 730055923bfSAlexander Aring } 731055923bfSAlexander Aring 7324798cbbfSAlexander Aring static int con_realloc_receive_buf(struct connection *con, int newlen) 7334798cbbfSAlexander Aring { 7344798cbbfSAlexander Aring unsigned char *newbuf; 7354798cbbfSAlexander Aring 7364798cbbfSAlexander Aring newbuf = kmalloc(newlen, GFP_NOFS); 7374798cbbfSAlexander Aring if (!newbuf) 7384798cbbfSAlexander Aring return -ENOMEM; 7394798cbbfSAlexander Aring 7404798cbbfSAlexander Aring /* copy any leftover from last receive */ 7414798cbbfSAlexander Aring if (con->rx_leftover) 7424798cbbfSAlexander Aring memmove(newbuf, con->rx_buf, con->rx_leftover); 7434798cbbfSAlexander Aring 7444798cbbfSAlexander Aring /* swap to new buffer space */ 7454798cbbfSAlexander Aring kfree(con->rx_buf); 7464798cbbfSAlexander Aring con->rx_buflen = newlen; 7474798cbbfSAlexander Aring con->rx_buf = newbuf; 7484798cbbfSAlexander Aring 7494798cbbfSAlexander Aring return 0; 7504798cbbfSAlexander Aring } 7514798cbbfSAlexander Aring 7526ed7257bSPatrick Caulfield /* Data received from remote end */ 7536ed7257bSPatrick Caulfield static int receive_from_sock(struct connection *con) 7546ed7257bSPatrick Caulfield { 7556ed7257bSPatrick Caulfield int call_again_soon = 0; 7564798cbbfSAlexander Aring struct msghdr msg; 7574798cbbfSAlexander Aring struct kvec iov; 7584798cbbfSAlexander Aring int ret, buflen; 7596ed7257bSPatrick Caulfield 7606ed7257bSPatrick Caulfield mutex_lock(&con->sock_mutex); 7616ed7257bSPatrick Caulfield 7626ed7257bSPatrick Caulfield if (con->sock == NULL) { 7636ed7257bSPatrick Caulfield ret = -EAGAIN; 7646ed7257bSPatrick Caulfield goto out_close; 7656ed7257bSPatrick Caulfield } 7664798cbbfSAlexander Aring 7674798cbbfSAlexander Aring /* realloc if we get new buffer size to read out */ 7684798cbbfSAlexander Aring buflen = dlm_config.ci_buffer_size; 7694798cbbfSAlexander Aring if (con->rx_buflen != buflen && con->rx_leftover <= buflen) { 7704798cbbfSAlexander Aring ret = con_realloc_receive_buf(con, buflen); 7714798cbbfSAlexander Aring if (ret < 0) 7726ed7257bSPatrick Caulfield goto out_resched; 7736ed7257bSPatrick Caulfield } 7746ed7257bSPatrick Caulfield 7754798cbbfSAlexander Aring /* calculate new buffer parameter regarding last receive and 7764798cbbfSAlexander Aring * possible leftover bytes 7776ed7257bSPatrick Caulfield */ 7784798cbbfSAlexander Aring iov.iov_base = con->rx_buf + con->rx_leftover; 7794798cbbfSAlexander Aring iov.iov_len = con->rx_buflen - con->rx_leftover; 7806ed7257bSPatrick Caulfield 7814798cbbfSAlexander Aring memset(&msg, 0, sizeof(msg)); 7824798cbbfSAlexander Aring msg.msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL; 7834798cbbfSAlexander Aring ret = kernel_recvmsg(con->sock, &msg, &iov, 1, iov.iov_len, 7844798cbbfSAlexander Aring msg.msg_flags); 7856ed7257bSPatrick Caulfield if (ret <= 0) 7866ed7257bSPatrick Caulfield goto out_close; 7874798cbbfSAlexander Aring else if (ret == iov.iov_len) 788ee44b4bcSMarcelo Ricardo Leitner call_again_soon = 1; 7896ed7257bSPatrick Caulfield 7904798cbbfSAlexander Aring /* new buflen according readed bytes and leftover from last receive */ 7914798cbbfSAlexander Aring buflen = ret + con->rx_leftover; 7924798cbbfSAlexander Aring ret = dlm_process_incoming_buffer(con->nodeid, con->rx_buf, buflen); 7934798cbbfSAlexander Aring if (ret < 0) 7944798cbbfSAlexander Aring goto out_close; 7956ed7257bSPatrick Caulfield 7964798cbbfSAlexander Aring /* calculate leftover bytes from process and put it into begin of 7974798cbbfSAlexander Aring * the receive buffer, so next receive we have the full message 7984798cbbfSAlexander Aring * at the start address of the receive buffer. 7994798cbbfSAlexander Aring */ 8004798cbbfSAlexander Aring con->rx_leftover = buflen - ret; 8014798cbbfSAlexander Aring if (con->rx_leftover) { 8024798cbbfSAlexander Aring memmove(con->rx_buf, con->rx_buf + ret, 8034798cbbfSAlexander Aring con->rx_leftover); 8044798cbbfSAlexander Aring call_again_soon = true; 8056ed7257bSPatrick Caulfield } 8066ed7257bSPatrick Caulfield 8076ed7257bSPatrick Caulfield if (call_again_soon) 8086ed7257bSPatrick Caulfield goto out_resched; 8094798cbbfSAlexander Aring 8106ed7257bSPatrick Caulfield mutex_unlock(&con->sock_mutex); 8116ed7257bSPatrick Caulfield return 0; 8126ed7257bSPatrick Caulfield 8136ed7257bSPatrick Caulfield out_resched: 8146ed7257bSPatrick Caulfield if (!test_and_set_bit(CF_READ_PENDING, &con->flags)) 8156ed7257bSPatrick Caulfield queue_work(recv_workqueue, &con->rwork); 8166ed7257bSPatrick Caulfield mutex_unlock(&con->sock_mutex); 8176ed7257bSPatrick Caulfield return -EAGAIN; 8186ed7257bSPatrick Caulfield 8196ed7257bSPatrick Caulfield out_close: 8206ed7257bSPatrick Caulfield mutex_unlock(&con->sock_mutex); 8219e5f2825SPatrick Caulfield if (ret != -EAGAIN) { 8226ed7257bSPatrick Caulfield /* Reconnect when there is something to send */ 823055923bfSAlexander Aring close_connection(con, false, true, false); 824055923bfSAlexander Aring if (ret == 0) { 825055923bfSAlexander Aring log_print("connection %p got EOF from %d", 826055923bfSAlexander Aring con, con->nodeid); 827055923bfSAlexander Aring /* handling for tcp shutdown */ 828055923bfSAlexander Aring clear_bit(CF_SHUTDOWN, &con->flags); 829055923bfSAlexander Aring wake_up(&con->shutdown_wait); 830055923bfSAlexander Aring /* signal to breaking receive worker */ 831055923bfSAlexander Aring ret = -1; 8326ed7257bSPatrick Caulfield } 833055923bfSAlexander Aring } 8346ed7257bSPatrick Caulfield return ret; 8356ed7257bSPatrick Caulfield } 8366ed7257bSPatrick Caulfield 8376ed7257bSPatrick Caulfield /* Listening socket is busy, accept a connection */ 838d11ccd45SAlexander Aring static int accept_from_sock(struct listen_connection *con) 8396ed7257bSPatrick Caulfield { 8406ed7257bSPatrick Caulfield int result; 8416ed7257bSPatrick Caulfield struct sockaddr_storage peeraddr; 8426ed7257bSPatrick Caulfield struct socket *newsock; 8436ed7257bSPatrick Caulfield int len; 8446ed7257bSPatrick Caulfield int nodeid; 8456ed7257bSPatrick Caulfield struct connection *newcon; 8466ed7257bSPatrick Caulfield struct connection *addcon; 8473f78cd7dSAlexander Aring unsigned int mark; 8486ed7257bSPatrick Caulfield 849513ef596SDavid Teigland if (!dlm_allow_conn) { 850513ef596SDavid Teigland return -1; 851513ef596SDavid Teigland } 852513ef596SDavid Teigland 853d11ccd45SAlexander Aring if (!con->sock) 8543421fb15Stsutomu.owa@toshiba.co.jp return -ENOTCONN; 8556ed7257bSPatrick Caulfield 8563421fb15Stsutomu.owa@toshiba.co.jp result = kernel_accept(con->sock, &newsock, O_NONBLOCK); 8576ed7257bSPatrick Caulfield if (result < 0) 8586ed7257bSPatrick Caulfield goto accept_err; 8596ed7257bSPatrick Caulfield 8606ed7257bSPatrick Caulfield /* Get the connected socket's peer */ 8616ed7257bSPatrick Caulfield memset(&peeraddr, 0, sizeof(peeraddr)); 8629b2c45d4SDenys Vlasenko len = newsock->ops->getname(newsock, (struct sockaddr *)&peeraddr, 2); 8639b2c45d4SDenys Vlasenko if (len < 0) { 8646ed7257bSPatrick Caulfield result = -ECONNABORTED; 8656ed7257bSPatrick Caulfield goto accept_err; 8666ed7257bSPatrick Caulfield } 8676ed7257bSPatrick Caulfield 8686ed7257bSPatrick Caulfield /* Get the new node's NODEID */ 8696ed7257bSPatrick Caulfield make_sockaddr(&peeraddr, 0, &len); 87036b71a8bSDavid Teigland if (addr_to_nodeid(&peeraddr, &nodeid)) { 871bcaadf5cSMasatake YAMATO unsigned char *b=(unsigned char *)&peeraddr; 872617e82e1SDavid Teigland log_print("connect from non cluster node"); 873bcaadf5cSMasatake YAMATO print_hex_dump_bytes("ss: ", DUMP_PREFIX_NONE, 874bcaadf5cSMasatake YAMATO b, sizeof(struct sockaddr_storage)); 8756ed7257bSPatrick Caulfield sock_release(newsock); 8766ed7257bSPatrick Caulfield return -1; 8776ed7257bSPatrick Caulfield } 8786ed7257bSPatrick Caulfield 8793f78cd7dSAlexander Aring dlm_comm_mark(nodeid, &mark); 8803f78cd7dSAlexander Aring sock_set_mark(newsock->sk, mark); 8813f78cd7dSAlexander Aring 8826ed7257bSPatrick Caulfield log_print("got connection from %d", nodeid); 8836ed7257bSPatrick Caulfield 8846ed7257bSPatrick Caulfield /* Check to see if we already have a connection to this node. This 8856ed7257bSPatrick Caulfield * could happen if the two nodes initiate a connection at roughly 8866ed7257bSPatrick Caulfield * the same time and the connections cross on the wire. 8876ed7257bSPatrick Caulfield * In this case we store the incoming one in "othercon" 8886ed7257bSPatrick Caulfield */ 889748285ccSDavid Teigland newcon = nodeid2con(nodeid, GFP_NOFS); 8906ed7257bSPatrick Caulfield if (!newcon) { 8916ed7257bSPatrick Caulfield result = -ENOMEM; 8926ed7257bSPatrick Caulfield goto accept_err; 8936ed7257bSPatrick Caulfield } 894d11ccd45SAlexander Aring 895d11ccd45SAlexander Aring mutex_lock(&newcon->sock_mutex); 8966ed7257bSPatrick Caulfield if (newcon->sock) { 8976ed7257bSPatrick Caulfield struct connection *othercon = newcon->othercon; 8986ed7257bSPatrick Caulfield 8996ed7257bSPatrick Caulfield if (!othercon) { 900a47666ebSAlexander Aring othercon = kzalloc(sizeof(*othercon), GFP_NOFS); 9016ed7257bSPatrick Caulfield if (!othercon) { 902617e82e1SDavid Teigland log_print("failed to allocate incoming socket"); 9036ed7257bSPatrick Caulfield mutex_unlock(&newcon->sock_mutex); 9046ed7257bSPatrick Caulfield result = -ENOMEM; 9056ed7257bSPatrick Caulfield goto accept_err; 9066ed7257bSPatrick Caulfield } 9074798cbbfSAlexander Aring 9086cde210aSAlexander Aring result = dlm_con_init(othercon, nodeid); 9096cde210aSAlexander Aring if (result < 0) { 9104798cbbfSAlexander Aring kfree(othercon); 9114798cbbfSAlexander Aring goto accept_err; 9124798cbbfSAlexander Aring } 9134798cbbfSAlexander Aring 9146cde210aSAlexander Aring newcon->othercon = othercon; 915ba3ab3caSAlexander Aring } else { 916ba3ab3caSAlexander Aring /* close other sock con if we have something new */ 917ba3ab3caSAlexander Aring close_connection(othercon, false, true, false); 91861d96be0SPatrick Caulfield } 919ba3ab3caSAlexander Aring 920d11ccd45SAlexander Aring mutex_lock_nested(&othercon->sock_mutex, 1); 921988419a9Stsutomu.owa@toshiba.co.jp add_sock(newsock, othercon); 9226ed7257bSPatrick Caulfield addcon = othercon; 923c7355827Stsutomu.owa@toshiba.co.jp mutex_unlock(&othercon->sock_mutex); 9246ed7257bSPatrick Caulfield } 9256ed7257bSPatrick Caulfield else { 9263735b4b9SBob Peterson /* accept copies the sk after we've saved the callbacks, so we 9273735b4b9SBob Peterson don't want to save them a second time or comm errors will 9283735b4b9SBob Peterson result in calling sk_error_report recursively. */ 929988419a9Stsutomu.owa@toshiba.co.jp add_sock(newsock, newcon); 9306ed7257bSPatrick Caulfield addcon = newcon; 9316ed7257bSPatrick Caulfield } 9326ed7257bSPatrick Caulfield 9336ed7257bSPatrick Caulfield mutex_unlock(&newcon->sock_mutex); 9346ed7257bSPatrick Caulfield 9356ed7257bSPatrick Caulfield /* 9366ed7257bSPatrick Caulfield * Add it to the active queue in case we got data 93725985edcSLucas De Marchi * between processing the accept adding the socket 9386ed7257bSPatrick Caulfield * to the read_sockets list 9396ed7257bSPatrick Caulfield */ 9406ed7257bSPatrick Caulfield if (!test_and_set_bit(CF_READ_PENDING, &addcon->flags)) 9416ed7257bSPatrick Caulfield queue_work(recv_workqueue, &addcon->rwork); 9426ed7257bSPatrick Caulfield 9436ed7257bSPatrick Caulfield return 0; 9446ed7257bSPatrick Caulfield 9456ed7257bSPatrick Caulfield accept_err: 9463421fb15Stsutomu.owa@toshiba.co.jp if (newsock) 9476ed7257bSPatrick Caulfield sock_release(newsock); 9486ed7257bSPatrick Caulfield 9496ed7257bSPatrick Caulfield if (result != -EAGAIN) 950617e82e1SDavid Teigland log_print("error accepting connection from node: %d", result); 9516ed7257bSPatrick Caulfield return result; 9526ed7257bSPatrick Caulfield } 9536ed7257bSPatrick Caulfield 9546ed7257bSPatrick Caulfield static void free_entry(struct writequeue_entry *e) 9556ed7257bSPatrick Caulfield { 9566ed7257bSPatrick Caulfield __free_page(e->page); 9576ed7257bSPatrick Caulfield kfree(e); 9586ed7257bSPatrick Caulfield } 9596ed7257bSPatrick Caulfield 9605d689871SMike Christie /* 9615d689871SMike Christie * writequeue_entry_complete - try to delete and free write queue entry 9625d689871SMike Christie * @e: write queue entry to try to delete 9635d689871SMike Christie * @completed: bytes completed 9645d689871SMike Christie * 9655d689871SMike Christie * writequeue_lock must be held. 9665d689871SMike Christie */ 9675d689871SMike Christie static void writequeue_entry_complete(struct writequeue_entry *e, int completed) 9685d689871SMike Christie { 9695d689871SMike Christie e->offset += completed; 9705d689871SMike Christie e->len -= completed; 9715d689871SMike Christie 9725d689871SMike Christie if (e->len == 0 && e->users == 0) { 9735d689871SMike Christie list_del(&e->list); 9745d689871SMike Christie free_entry(e); 9755d689871SMike Christie } 9765d689871SMike Christie } 9775d689871SMike Christie 978ee44b4bcSMarcelo Ricardo Leitner /* 979ee44b4bcSMarcelo Ricardo Leitner * sctp_bind_addrs - bind a SCTP socket to all our addresses 980ee44b4bcSMarcelo Ricardo Leitner */ 98113004e8aSAlexander Aring static int sctp_bind_addrs(struct socket *sock, uint16_t port) 982ee44b4bcSMarcelo Ricardo Leitner { 983ee44b4bcSMarcelo Ricardo Leitner struct sockaddr_storage localaddr; 984c0425a42SChristoph Hellwig struct sockaddr *addr = (struct sockaddr *)&localaddr; 985ee44b4bcSMarcelo Ricardo Leitner int i, addr_len, result = 0; 986ee44b4bcSMarcelo Ricardo Leitner 987ee44b4bcSMarcelo Ricardo Leitner for (i = 0; i < dlm_local_count; i++) { 988ee44b4bcSMarcelo Ricardo Leitner memcpy(&localaddr, dlm_local_addr[i], sizeof(localaddr)); 989ee44b4bcSMarcelo Ricardo Leitner make_sockaddr(&localaddr, port, &addr_len); 990ee44b4bcSMarcelo Ricardo Leitner 991ee44b4bcSMarcelo Ricardo Leitner if (!i) 99213004e8aSAlexander Aring result = kernel_bind(sock, addr, addr_len); 993ee44b4bcSMarcelo Ricardo Leitner else 99413004e8aSAlexander Aring result = sock_bind_add(sock->sk, addr, addr_len); 995ee44b4bcSMarcelo Ricardo Leitner 996ee44b4bcSMarcelo Ricardo Leitner if (result < 0) { 997ee44b4bcSMarcelo Ricardo Leitner log_print("Can't bind to %d addr number %d, %d.\n", 998ee44b4bcSMarcelo Ricardo Leitner port, i + 1, result); 999ee44b4bcSMarcelo Ricardo Leitner break; 1000ee44b4bcSMarcelo Ricardo Leitner } 1001ee44b4bcSMarcelo Ricardo Leitner } 1002ee44b4bcSMarcelo Ricardo Leitner return result; 1003ee44b4bcSMarcelo Ricardo Leitner } 1004ee44b4bcSMarcelo Ricardo Leitner 10056ed7257bSPatrick Caulfield /* Initiate an SCTP association. 10066ed7257bSPatrick Caulfield This is a special case of send_to_sock() in that we don't yet have a 10076ed7257bSPatrick Caulfield peeled-off socket for this association, so we use the listening socket 10086ed7257bSPatrick Caulfield and add the primary IP address of the remote node. 10096ed7257bSPatrick Caulfield */ 1010ee44b4bcSMarcelo Ricardo Leitner static void sctp_connect_to_sock(struct connection *con) 10116ed7257bSPatrick Caulfield { 1012ee44b4bcSMarcelo Ricardo Leitner struct sockaddr_storage daddr; 1013ee44b4bcSMarcelo Ricardo Leitner int result; 1014ee44b4bcSMarcelo Ricardo Leitner int addr_len; 1015ee44b4bcSMarcelo Ricardo Leitner struct socket *sock; 10169c9f168fSAlexander Aring unsigned int mark; 1017ee44b4bcSMarcelo Ricardo Leitner 10183f78cd7dSAlexander Aring dlm_comm_mark(con->nodeid, &mark); 10190461e0dbSAlexander Aring 10205d689871SMike Christie mutex_lock(&con->sock_mutex); 10216ed7257bSPatrick Caulfield 1022ee44b4bcSMarcelo Ricardo Leitner /* Some odd races can cause double-connects, ignore them */ 1023ee44b4bcSMarcelo Ricardo Leitner if (con->retries++ > MAX_CONNECT_RETRIES) 1024ee44b4bcSMarcelo Ricardo Leitner goto out; 1025ee44b4bcSMarcelo Ricardo Leitner 1026ee44b4bcSMarcelo Ricardo Leitner if (con->sock) { 1027ee44b4bcSMarcelo Ricardo Leitner log_print("node %d already connected.", con->nodeid); 1028ee44b4bcSMarcelo Ricardo Leitner goto out; 1029ee44b4bcSMarcelo Ricardo Leitner } 1030ee44b4bcSMarcelo Ricardo Leitner 1031ee44b4bcSMarcelo Ricardo Leitner memset(&daddr, 0, sizeof(daddr)); 1032ee44b4bcSMarcelo Ricardo Leitner result = nodeid_to_addr(con->nodeid, &daddr, NULL, true); 1033ee44b4bcSMarcelo Ricardo Leitner if (result < 0) { 10346ed7257bSPatrick Caulfield log_print("no address for nodeid %d", con->nodeid); 1035ee44b4bcSMarcelo Ricardo Leitner goto out; 103604bedd79SDavid Teigland } 10376ed7257bSPatrick Caulfield 1038ee44b4bcSMarcelo Ricardo Leitner /* Create a socket to communicate with */ 1039ee44b4bcSMarcelo Ricardo Leitner result = sock_create_kern(&init_net, dlm_local_addr[0]->ss_family, 1040ee44b4bcSMarcelo Ricardo Leitner SOCK_STREAM, IPPROTO_SCTP, &sock); 1041ee44b4bcSMarcelo Ricardo Leitner if (result < 0) 1042ee44b4bcSMarcelo Ricardo Leitner goto socket_err; 10436ed7257bSPatrick Caulfield 10449c9f168fSAlexander Aring sock_set_mark(sock->sk, mark); 10459c9f168fSAlexander Aring 1046988419a9Stsutomu.owa@toshiba.co.jp add_sock(sock, con); 10476ed7257bSPatrick Caulfield 1048ee44b4bcSMarcelo Ricardo Leitner /* Bind to all addresses. */ 104913004e8aSAlexander Aring if (sctp_bind_addrs(con->sock, 0)) 1050ee44b4bcSMarcelo Ricardo Leitner goto bind_err; 105198e1b60eSMike Christie 1052ee44b4bcSMarcelo Ricardo Leitner make_sockaddr(&daddr, dlm_config.ci_tcp_port, &addr_len); 10536ed7257bSPatrick Caulfield 1054ee44b4bcSMarcelo Ricardo Leitner log_print("connecting to %d", con->nodeid); 10556ed7257bSPatrick Caulfield 1056ee44b4bcSMarcelo Ricardo Leitner /* Turn off Nagle's algorithm */ 105740ef92c6SChristoph Hellwig sctp_sock_set_nodelay(sock->sk); 1058ee44b4bcSMarcelo Ricardo Leitner 1059f706d830SGang He /* 1060f706d830SGang He * Make sock->ops->connect() function return in specified time, 1061f706d830SGang He * since O_NONBLOCK argument in connect() function does not work here, 1062f706d830SGang He * then, we should restore the default value of this attribute. 1063f706d830SGang He */ 106476ee0785SChristoph Hellwig sock_set_sndtimeo(sock->sk, 5); 1065ee44b4bcSMarcelo Ricardo Leitner result = sock->ops->connect(sock, (struct sockaddr *)&daddr, addr_len, 1066da3627c3SGang He 0); 106776ee0785SChristoph Hellwig sock_set_sndtimeo(sock->sk, 0); 1068f706d830SGang He 1069ee44b4bcSMarcelo Ricardo Leitner if (result == -EINPROGRESS) 1070ee44b4bcSMarcelo Ricardo Leitner result = 0; 107119633c7eSAlexander Aring if (result == 0) { 107219633c7eSAlexander Aring if (!test_and_set_bit(CF_CONNECTED, &con->flags)) 107319633c7eSAlexander Aring log_print("successful connected to node %d", con->nodeid); 1074ee44b4bcSMarcelo Ricardo Leitner goto out; 107519633c7eSAlexander Aring } 1076ee44b4bcSMarcelo Ricardo Leitner 1077ee44b4bcSMarcelo Ricardo Leitner bind_err: 1078ee44b4bcSMarcelo Ricardo Leitner con->sock = NULL; 1079ee44b4bcSMarcelo Ricardo Leitner sock_release(sock); 1080ee44b4bcSMarcelo Ricardo Leitner 1081ee44b4bcSMarcelo Ricardo Leitner socket_err: 1082ee44b4bcSMarcelo Ricardo Leitner /* 1083ee44b4bcSMarcelo Ricardo Leitner * Some errors are fatal and this list might need adjusting. For other 1084ee44b4bcSMarcelo Ricardo Leitner * errors we try again until the max number of retries is reached. 1085ee44b4bcSMarcelo Ricardo Leitner */ 1086ee44b4bcSMarcelo Ricardo Leitner if (result != -EHOSTUNREACH && 1087ee44b4bcSMarcelo Ricardo Leitner result != -ENETUNREACH && 1088ee44b4bcSMarcelo Ricardo Leitner result != -ENETDOWN && 1089ee44b4bcSMarcelo Ricardo Leitner result != -EINVAL && 1090ee44b4bcSMarcelo Ricardo Leitner result != -EPROTONOSUPPORT) { 1091ee44b4bcSMarcelo Ricardo Leitner log_print("connect %d try %d error %d", con->nodeid, 1092ee44b4bcSMarcelo Ricardo Leitner con->retries, result); 1093ee44b4bcSMarcelo Ricardo Leitner mutex_unlock(&con->sock_mutex); 1094ee44b4bcSMarcelo Ricardo Leitner msleep(1000); 1095ee44b4bcSMarcelo Ricardo Leitner lowcomms_connect_sock(con); 1096ee44b4bcSMarcelo Ricardo Leitner return; 10976ed7257bSPatrick Caulfield } 10985d689871SMike Christie 1099ee44b4bcSMarcelo Ricardo Leitner out: 11005d689871SMike Christie mutex_unlock(&con->sock_mutex); 11016ed7257bSPatrick Caulfield } 11026ed7257bSPatrick Caulfield 11036ed7257bSPatrick Caulfield /* Connect a new socket to its peer */ 11046ed7257bSPatrick Caulfield static void tcp_connect_to_sock(struct connection *con) 11056ed7257bSPatrick Caulfield { 11066bd8fedaSLon Hohberger struct sockaddr_storage saddr, src_addr; 11076ed7257bSPatrick Caulfield int addr_len; 1108a89d63a1SCasey Dahlin struct socket *sock = NULL; 11099c9f168fSAlexander Aring unsigned int mark; 111036b71a8bSDavid Teigland int result; 11116ed7257bSPatrick Caulfield 11123f78cd7dSAlexander Aring dlm_comm_mark(con->nodeid, &mark); 11130461e0dbSAlexander Aring 11146ed7257bSPatrick Caulfield mutex_lock(&con->sock_mutex); 11156ed7257bSPatrick Caulfield if (con->retries++ > MAX_CONNECT_RETRIES) 11166ed7257bSPatrick Caulfield goto out; 11176ed7257bSPatrick Caulfield 11186ed7257bSPatrick Caulfield /* Some odd races can cause double-connects, ignore them */ 111936b71a8bSDavid Teigland if (con->sock) 11206ed7257bSPatrick Caulfield goto out; 11216ed7257bSPatrick Caulfield 11226ed7257bSPatrick Caulfield /* Create a socket to communicate with */ 1123eeb1bd5cSEric W. Biederman result = sock_create_kern(&init_net, dlm_local_addr[0]->ss_family, 1124eeb1bd5cSEric W. Biederman SOCK_STREAM, IPPROTO_TCP, &sock); 11256ed7257bSPatrick Caulfield if (result < 0) 11266ed7257bSPatrick Caulfield goto out_err; 11276ed7257bSPatrick Caulfield 11289c9f168fSAlexander Aring sock_set_mark(sock->sk, mark); 11299c9f168fSAlexander Aring 11306ed7257bSPatrick Caulfield memset(&saddr, 0, sizeof(saddr)); 113198e1b60eSMike Christie result = nodeid_to_addr(con->nodeid, &saddr, NULL, false); 113236b71a8bSDavid Teigland if (result < 0) { 113336b71a8bSDavid Teigland log_print("no address for nodeid %d", con->nodeid); 11346ed7257bSPatrick Caulfield goto out_err; 113536b71a8bSDavid Teigland } 11366ed7257bSPatrick Caulfield 1137988419a9Stsutomu.owa@toshiba.co.jp add_sock(sock, con); 11386ed7257bSPatrick Caulfield 11396bd8fedaSLon Hohberger /* Bind to our cluster-known address connecting to avoid 11406bd8fedaSLon Hohberger routing problems */ 11416bd8fedaSLon Hohberger memcpy(&src_addr, dlm_local_addr[0], sizeof(src_addr)); 11426bd8fedaSLon Hohberger make_sockaddr(&src_addr, 0, &addr_len); 11436bd8fedaSLon Hohberger result = sock->ops->bind(sock, (struct sockaddr *) &src_addr, 11446bd8fedaSLon Hohberger addr_len); 11456bd8fedaSLon Hohberger if (result < 0) { 11466bd8fedaSLon Hohberger log_print("could not bind for connect: %d", result); 11476bd8fedaSLon Hohberger /* This *may* not indicate a critical error */ 11486bd8fedaSLon Hohberger } 11496bd8fedaSLon Hohberger 11506ed7257bSPatrick Caulfield make_sockaddr(&saddr, dlm_config.ci_tcp_port, &addr_len); 11516ed7257bSPatrick Caulfield 11526ed7257bSPatrick Caulfield log_print("connecting to %d", con->nodeid); 1153cb2d45daSDavid Teigland 1154cb2d45daSDavid Teigland /* Turn off Nagle's algorithm */ 115512abc5eeSChristoph Hellwig tcp_sock_set_nodelay(sock->sk); 1156cb2d45daSDavid Teigland 115736b71a8bSDavid Teigland result = sock->ops->connect(sock, (struct sockaddr *)&saddr, addr_len, 11586ed7257bSPatrick Caulfield O_NONBLOCK); 11596ed7257bSPatrick Caulfield if (result == -EINPROGRESS) 11606ed7257bSPatrick Caulfield result = 0; 11616ed7257bSPatrick Caulfield if (result == 0) 11626ed7257bSPatrick Caulfield goto out; 11636ed7257bSPatrick Caulfield 11646ed7257bSPatrick Caulfield out_err: 11656ed7257bSPatrick Caulfield if (con->sock) { 11666ed7257bSPatrick Caulfield sock_release(con->sock); 11676ed7257bSPatrick Caulfield con->sock = NULL; 1168a89d63a1SCasey Dahlin } else if (sock) { 1169a89d63a1SCasey Dahlin sock_release(sock); 11706ed7257bSPatrick Caulfield } 11716ed7257bSPatrick Caulfield /* 11726ed7257bSPatrick Caulfield * Some errors are fatal and this list might need adjusting. For other 11736ed7257bSPatrick Caulfield * errors we try again until the max number of retries is reached. 11746ed7257bSPatrick Caulfield */ 117536b71a8bSDavid Teigland if (result != -EHOSTUNREACH && 117636b71a8bSDavid Teigland result != -ENETUNREACH && 117736b71a8bSDavid Teigland result != -ENETDOWN && 117836b71a8bSDavid Teigland result != -EINVAL && 117936b71a8bSDavid Teigland result != -EPROTONOSUPPORT) { 118036b71a8bSDavid Teigland log_print("connect %d try %d error %d", con->nodeid, 118136b71a8bSDavid Teigland con->retries, result); 118236b71a8bSDavid Teigland mutex_unlock(&con->sock_mutex); 118336b71a8bSDavid Teigland msleep(1000); 11846ed7257bSPatrick Caulfield lowcomms_connect_sock(con); 118536b71a8bSDavid Teigland return; 11866ed7257bSPatrick Caulfield } 11876ed7257bSPatrick Caulfield out: 11886ed7257bSPatrick Caulfield mutex_unlock(&con->sock_mutex); 11896ed7257bSPatrick Caulfield return; 11906ed7257bSPatrick Caulfield } 11916ed7257bSPatrick Caulfield 1192d11ccd45SAlexander Aring /* On error caller must run dlm_close_sock() for the 1193d11ccd45SAlexander Aring * listen connection socket. 1194d11ccd45SAlexander Aring */ 1195d11ccd45SAlexander Aring static int tcp_create_listen_sock(struct listen_connection *con, 11966ed7257bSPatrick Caulfield struct sockaddr_storage *saddr) 11976ed7257bSPatrick Caulfield { 11986ed7257bSPatrick Caulfield struct socket *sock = NULL; 11996ed7257bSPatrick Caulfield int result = 0; 12006ed7257bSPatrick Caulfield int addr_len; 12016ed7257bSPatrick Caulfield 12026ed7257bSPatrick Caulfield if (dlm_local_addr[0]->ss_family == AF_INET) 12036ed7257bSPatrick Caulfield addr_len = sizeof(struct sockaddr_in); 12046ed7257bSPatrick Caulfield else 12056ed7257bSPatrick Caulfield addr_len = sizeof(struct sockaddr_in6); 12066ed7257bSPatrick Caulfield 12076ed7257bSPatrick Caulfield /* Create a socket to communicate with */ 1208eeb1bd5cSEric W. Biederman result = sock_create_kern(&init_net, dlm_local_addr[0]->ss_family, 1209eeb1bd5cSEric W. Biederman SOCK_STREAM, IPPROTO_TCP, &sock); 12106ed7257bSPatrick Caulfield if (result < 0) { 1211617e82e1SDavid Teigland log_print("Can't create listening comms socket"); 12126ed7257bSPatrick Caulfield goto create_out; 12136ed7257bSPatrick Caulfield } 12146ed7257bSPatrick Caulfield 1215a5b7ab63SAlexander Aring sock_set_mark(sock->sk, dlm_config.ci_mark); 1216a5b7ab63SAlexander Aring 1217cb2d45daSDavid Teigland /* Turn off Nagle's algorithm */ 121812abc5eeSChristoph Hellwig tcp_sock_set_nodelay(sock->sk); 1219cb2d45daSDavid Teigland 1220b58f0e8fSChristoph Hellwig sock_set_reuseaddr(sock->sk); 12216ed7257bSPatrick Caulfield 1222d11ccd45SAlexander Aring add_listen_sock(sock, con); 12236ed7257bSPatrick Caulfield 12246ed7257bSPatrick Caulfield /* Bind to our port */ 12256ed7257bSPatrick Caulfield make_sockaddr(saddr, dlm_config.ci_tcp_port, &addr_len); 12266ed7257bSPatrick Caulfield result = sock->ops->bind(sock, (struct sockaddr *) saddr, addr_len); 12276ed7257bSPatrick Caulfield if (result < 0) { 1228617e82e1SDavid Teigland log_print("Can't bind to port %d", dlm_config.ci_tcp_port); 12296ed7257bSPatrick Caulfield goto create_out; 12306ed7257bSPatrick Caulfield } 1231ce3d9544SChristoph Hellwig sock_set_keepalive(sock->sk); 12326ed7257bSPatrick Caulfield 12336ed7257bSPatrick Caulfield result = sock->ops->listen(sock, 5); 12346ed7257bSPatrick Caulfield if (result < 0) { 1235617e82e1SDavid Teigland log_print("Can't listen on port %d", dlm_config.ci_tcp_port); 12366ed7257bSPatrick Caulfield goto create_out; 12376ed7257bSPatrick Caulfield } 12386ed7257bSPatrick Caulfield 1239d11ccd45SAlexander Aring return 0; 1240d11ccd45SAlexander Aring 12416ed7257bSPatrick Caulfield create_out: 1242d11ccd45SAlexander Aring return result; 12436ed7257bSPatrick Caulfield } 12446ed7257bSPatrick Caulfield 12456ed7257bSPatrick Caulfield /* Get local addresses */ 12466ed7257bSPatrick Caulfield static void init_local(void) 12476ed7257bSPatrick Caulfield { 12486ed7257bSPatrick Caulfield struct sockaddr_storage sas, *addr; 12496ed7257bSPatrick Caulfield int i; 12506ed7257bSPatrick Caulfield 125130d3a237SPatrick Caulfield dlm_local_count = 0; 12521b189b88SDavid Teigland for (i = 0; i < DLM_MAX_ADDR_COUNT; i++) { 12536ed7257bSPatrick Caulfield if (dlm_our_addr(&sas, i)) 12546ed7257bSPatrick Caulfield break; 12556ed7257bSPatrick Caulfield 12565c93f56fSAmitoj Kaur Chawla addr = kmemdup(&sas, sizeof(*addr), GFP_NOFS); 12576ed7257bSPatrick Caulfield if (!addr) 12586ed7257bSPatrick Caulfield break; 12596ed7257bSPatrick Caulfield dlm_local_addr[dlm_local_count++] = addr; 12606ed7257bSPatrick Caulfield } 12616ed7257bSPatrick Caulfield } 12626ed7257bSPatrick Caulfield 1263043697f0SAlexander Aring static void deinit_local(void) 1264043697f0SAlexander Aring { 1265043697f0SAlexander Aring int i; 1266043697f0SAlexander Aring 1267043697f0SAlexander Aring for (i = 0; i < dlm_local_count; i++) 1268043697f0SAlexander Aring kfree(dlm_local_addr[i]); 1269043697f0SAlexander Aring } 1270043697f0SAlexander Aring 1271d11ccd45SAlexander Aring /* Initialise SCTP socket and bind to all interfaces 1272d11ccd45SAlexander Aring * On error caller must run dlm_close_sock() for the 1273d11ccd45SAlexander Aring * listen connection socket. 1274d11ccd45SAlexander Aring */ 1275d11ccd45SAlexander Aring static int sctp_listen_for_all(struct listen_connection *con) 12766ed7257bSPatrick Caulfield { 12776ed7257bSPatrick Caulfield struct socket *sock = NULL; 1278ee44b4bcSMarcelo Ricardo Leitner int result = -EINVAL; 12796ed7257bSPatrick Caulfield 12806ed7257bSPatrick Caulfield log_print("Using SCTP for communications"); 12816ed7257bSPatrick Caulfield 1282eeb1bd5cSEric W. Biederman result = sock_create_kern(&init_net, dlm_local_addr[0]->ss_family, 1283ee44b4bcSMarcelo Ricardo Leitner SOCK_STREAM, IPPROTO_SCTP, &sock); 12846ed7257bSPatrick Caulfield if (result < 0) { 12856ed7257bSPatrick Caulfield log_print("Can't create comms socket, check SCTP is loaded"); 12866ed7257bSPatrick Caulfield goto out; 12876ed7257bSPatrick Caulfield } 12886ed7257bSPatrick Caulfield 128926cfabf9SChristoph Hellwig sock_set_rcvbuf(sock->sk, NEEDED_RMEM); 1290a5b7ab63SAlexander Aring sock_set_mark(sock->sk, dlm_config.ci_mark); 129140ef92c6SChristoph Hellwig sctp_sock_set_nodelay(sock->sk); 129286e92ad2SMike Christie 1293d11ccd45SAlexander Aring add_listen_sock(sock, con); 1294b81171cbSBob Peterson 1295ee44b4bcSMarcelo Ricardo Leitner /* Bind to all addresses. */ 1296d11ccd45SAlexander Aring result = sctp_bind_addrs(con->sock, dlm_config.ci_tcp_port); 1297d11ccd45SAlexander Aring if (result < 0) 1298d11ccd45SAlexander Aring goto out; 12996ed7257bSPatrick Caulfield 13006ed7257bSPatrick Caulfield result = sock->ops->listen(sock, 5); 13016ed7257bSPatrick Caulfield if (result < 0) { 13026ed7257bSPatrick Caulfield log_print("Can't set socket listening"); 1303d11ccd45SAlexander Aring goto out; 13046ed7257bSPatrick Caulfield } 13056ed7257bSPatrick Caulfield 13066ed7257bSPatrick Caulfield return 0; 13076ed7257bSPatrick Caulfield 13086ed7257bSPatrick Caulfield out: 13096ed7257bSPatrick Caulfield return result; 13106ed7257bSPatrick Caulfield } 13116ed7257bSPatrick Caulfield 13126ed7257bSPatrick Caulfield static int tcp_listen_for_all(void) 13136ed7257bSPatrick Caulfield { 13146ed7257bSPatrick Caulfield /* We don't support multi-homed hosts */ 13151a26bfafSAlexander Aring if (dlm_local_count > 1) { 1316617e82e1SDavid Teigland log_print("TCP protocol can't handle multi-homed hosts, " 1317617e82e1SDavid Teigland "try SCTP"); 13186ed7257bSPatrick Caulfield return -EINVAL; 13196ed7257bSPatrick Caulfield } 13206ed7257bSPatrick Caulfield 13216ed7257bSPatrick Caulfield log_print("Using TCP for communications"); 13226ed7257bSPatrick Caulfield 1323d11ccd45SAlexander Aring return tcp_create_listen_sock(&listen_con, dlm_local_addr[0]); 13246ed7257bSPatrick Caulfield } 13256ed7257bSPatrick Caulfield 13266ed7257bSPatrick Caulfield 13276ed7257bSPatrick Caulfield 13286ed7257bSPatrick Caulfield static struct writequeue_entry *new_writequeue_entry(struct connection *con, 13296ed7257bSPatrick Caulfield gfp_t allocation) 13306ed7257bSPatrick Caulfield { 13316ed7257bSPatrick Caulfield struct writequeue_entry *entry; 13326ed7257bSPatrick Caulfield 13336ed7257bSPatrick Caulfield entry = kmalloc(sizeof(struct writequeue_entry), allocation); 13346ed7257bSPatrick Caulfield if (!entry) 13356ed7257bSPatrick Caulfield return NULL; 13366ed7257bSPatrick Caulfield 13376ed7257bSPatrick Caulfield entry->page = alloc_page(allocation); 13386ed7257bSPatrick Caulfield if (!entry->page) { 13396ed7257bSPatrick Caulfield kfree(entry); 13406ed7257bSPatrick Caulfield return NULL; 13416ed7257bSPatrick Caulfield } 13426ed7257bSPatrick Caulfield 13436ed7257bSPatrick Caulfield entry->offset = 0; 13446ed7257bSPatrick Caulfield entry->len = 0; 13456ed7257bSPatrick Caulfield entry->end = 0; 13466ed7257bSPatrick Caulfield entry->users = 0; 13476ed7257bSPatrick Caulfield entry->con = con; 13486ed7257bSPatrick Caulfield 13496ed7257bSPatrick Caulfield return entry; 13506ed7257bSPatrick Caulfield } 13516ed7257bSPatrick Caulfield 1352617e82e1SDavid Teigland void *dlm_lowcomms_get_buffer(int nodeid, int len, gfp_t allocation, char **ppc) 13536ed7257bSPatrick Caulfield { 13546ed7257bSPatrick Caulfield struct connection *con; 13556ed7257bSPatrick Caulfield struct writequeue_entry *e; 13566ed7257bSPatrick Caulfield int offset = 0; 13576ed7257bSPatrick Caulfield 1358692f51c8SAlexander Aring if (len > LOWCOMMS_MAX_TX_BUFFER_LEN) { 1359692f51c8SAlexander Aring BUILD_BUG_ON(PAGE_SIZE < LOWCOMMS_MAX_TX_BUFFER_LEN); 1360692f51c8SAlexander Aring log_print("failed to allocate a buffer of size %d", len); 1361692f51c8SAlexander Aring return NULL; 1362692f51c8SAlexander Aring } 1363692f51c8SAlexander Aring 13646ed7257bSPatrick Caulfield con = nodeid2con(nodeid, allocation); 13656ed7257bSPatrick Caulfield if (!con) 13666ed7257bSPatrick Caulfield return NULL; 13676ed7257bSPatrick Caulfield 13686ed7257bSPatrick Caulfield spin_lock(&con->writequeue_lock); 13696ed7257bSPatrick Caulfield e = list_entry(con->writequeue.prev, struct writequeue_entry, list); 13706ed7257bSPatrick Caulfield if ((&e->list == &con->writequeue) || 137109cbfeafSKirill A. Shutemov (PAGE_SIZE - e->end < len)) { 13726ed7257bSPatrick Caulfield e = NULL; 13736ed7257bSPatrick Caulfield } else { 13746ed7257bSPatrick Caulfield offset = e->end; 13756ed7257bSPatrick Caulfield e->end += len; 1376eeee2b5fSWei Yongjun e->users++; 13776ed7257bSPatrick Caulfield } 13786ed7257bSPatrick Caulfield spin_unlock(&con->writequeue_lock); 13796ed7257bSPatrick Caulfield 13806ed7257bSPatrick Caulfield if (e) { 13816ed7257bSPatrick Caulfield got_one: 13826ed7257bSPatrick Caulfield *ppc = page_address(e->page) + offset; 13836ed7257bSPatrick Caulfield return e; 13846ed7257bSPatrick Caulfield } 13856ed7257bSPatrick Caulfield 13866ed7257bSPatrick Caulfield e = new_writequeue_entry(con, allocation); 13876ed7257bSPatrick Caulfield if (e) { 13886ed7257bSPatrick Caulfield spin_lock(&con->writequeue_lock); 13896ed7257bSPatrick Caulfield offset = e->end; 13906ed7257bSPatrick Caulfield e->end += len; 1391eeee2b5fSWei Yongjun e->users++; 13926ed7257bSPatrick Caulfield list_add_tail(&e->list, &con->writequeue); 13936ed7257bSPatrick Caulfield spin_unlock(&con->writequeue_lock); 13946ed7257bSPatrick Caulfield goto got_one; 13956ed7257bSPatrick Caulfield } 13966ed7257bSPatrick Caulfield return NULL; 13976ed7257bSPatrick Caulfield } 13986ed7257bSPatrick Caulfield 13996ed7257bSPatrick Caulfield void dlm_lowcomms_commit_buffer(void *mh) 14006ed7257bSPatrick Caulfield { 14016ed7257bSPatrick Caulfield struct writequeue_entry *e = (struct writequeue_entry *)mh; 14026ed7257bSPatrick Caulfield struct connection *con = e->con; 14036ed7257bSPatrick Caulfield int users; 14046ed7257bSPatrick Caulfield 14056ed7257bSPatrick Caulfield spin_lock(&con->writequeue_lock); 14066ed7257bSPatrick Caulfield users = --e->users; 14076ed7257bSPatrick Caulfield if (users) 14086ed7257bSPatrick Caulfield goto out; 14096ed7257bSPatrick Caulfield e->len = e->end - e->offset; 14106ed7257bSPatrick Caulfield spin_unlock(&con->writequeue_lock); 14116ed7257bSPatrick Caulfield 14126ed7257bSPatrick Caulfield queue_work(send_workqueue, &con->swork); 14136ed7257bSPatrick Caulfield return; 14146ed7257bSPatrick Caulfield 14156ed7257bSPatrick Caulfield out: 14166ed7257bSPatrick Caulfield spin_unlock(&con->writequeue_lock); 14176ed7257bSPatrick Caulfield return; 14186ed7257bSPatrick Caulfield } 14196ed7257bSPatrick Caulfield 14206ed7257bSPatrick Caulfield /* Send a message */ 14216ed7257bSPatrick Caulfield static void send_to_sock(struct connection *con) 14226ed7257bSPatrick Caulfield { 14236ed7257bSPatrick Caulfield int ret = 0; 14246ed7257bSPatrick Caulfield const int msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL; 14256ed7257bSPatrick Caulfield struct writequeue_entry *e; 14266ed7257bSPatrick Caulfield int len, offset; 1427f92c8dd7SBob Peterson int count = 0; 14286ed7257bSPatrick Caulfield 14296ed7257bSPatrick Caulfield mutex_lock(&con->sock_mutex); 14306ed7257bSPatrick Caulfield if (con->sock == NULL) 14316ed7257bSPatrick Caulfield goto out_connect; 14326ed7257bSPatrick Caulfield 14336ed7257bSPatrick Caulfield spin_lock(&con->writequeue_lock); 14346ed7257bSPatrick Caulfield for (;;) { 14356ed7257bSPatrick Caulfield e = list_entry(con->writequeue.next, struct writequeue_entry, 14366ed7257bSPatrick Caulfield list); 14376ed7257bSPatrick Caulfield if ((struct list_head *) e == &con->writequeue) 14386ed7257bSPatrick Caulfield break; 14396ed7257bSPatrick Caulfield 14406ed7257bSPatrick Caulfield len = e->len; 14416ed7257bSPatrick Caulfield offset = e->offset; 14426ed7257bSPatrick Caulfield BUG_ON(len == 0 && e->users == 0); 14436ed7257bSPatrick Caulfield spin_unlock(&con->writequeue_lock); 14446ed7257bSPatrick Caulfield 14456ed7257bSPatrick Caulfield ret = 0; 14466ed7257bSPatrick Caulfield if (len) { 14471329e3f2SPaolo Bonzini ret = kernel_sendpage(con->sock, e->page, offset, len, 14486ed7257bSPatrick Caulfield msg_flags); 1449d66f8277SPatrick Caulfield if (ret == -EAGAIN || ret == 0) { 1450b36930ddSDavid Miller if (ret == -EAGAIN && 14519cd3e072SEric Dumazet test_bit(SOCKWQ_ASYNC_NOSPACE, &con->sock->flags) && 1452b36930ddSDavid Miller !test_and_set_bit(CF_APP_LIMITED, &con->flags)) { 1453b36930ddSDavid Miller /* Notify TCP that we're limited by the 1454b36930ddSDavid Miller * application window size. 1455b36930ddSDavid Miller */ 1456b36930ddSDavid Miller set_bit(SOCK_NOSPACE, &con->sock->flags); 1457b36930ddSDavid Miller con->sock->sk->sk_write_pending++; 1458b36930ddSDavid Miller } 1459d66f8277SPatrick Caulfield cond_resched(); 14606ed7257bSPatrick Caulfield goto out; 14619c5bef58SYing Xue } else if (ret < 0) 14626ed7257bSPatrick Caulfield goto send_error; 1463d66f8277SPatrick Caulfield } 1464f92c8dd7SBob Peterson 14656ed7257bSPatrick Caulfield /* Don't starve people filling buffers */ 1466f92c8dd7SBob Peterson if (++count >= MAX_SEND_MSG_COUNT) { 14676ed7257bSPatrick Caulfield cond_resched(); 1468f92c8dd7SBob Peterson count = 0; 1469f92c8dd7SBob Peterson } 14706ed7257bSPatrick Caulfield 14716ed7257bSPatrick Caulfield spin_lock(&con->writequeue_lock); 14725d689871SMike Christie writequeue_entry_complete(e, ret); 14736ed7257bSPatrick Caulfield } 14746ed7257bSPatrick Caulfield spin_unlock(&con->writequeue_lock); 14756ed7257bSPatrick Caulfield out: 14766ed7257bSPatrick Caulfield mutex_unlock(&con->sock_mutex); 14776ed7257bSPatrick Caulfield return; 14786ed7257bSPatrick Caulfield 14796ed7257bSPatrick Caulfield send_error: 14806ed7257bSPatrick Caulfield mutex_unlock(&con->sock_mutex); 1481ba3ab3caSAlexander Aring close_connection(con, false, false, true); 148201da24d3SBob Peterson /* Requeue the send work. When the work daemon runs again, it will try 148301da24d3SBob Peterson a new connection, then call this function again. */ 148401da24d3SBob Peterson queue_work(send_workqueue, &con->swork); 14856ed7257bSPatrick Caulfield return; 14866ed7257bSPatrick Caulfield 14876ed7257bSPatrick Caulfield out_connect: 14886ed7257bSPatrick Caulfield mutex_unlock(&con->sock_mutex); 148901da24d3SBob Peterson queue_work(send_workqueue, &con->swork); 149001da24d3SBob Peterson cond_resched(); 14916ed7257bSPatrick Caulfield } 14926ed7257bSPatrick Caulfield 14936ed7257bSPatrick Caulfield static void clean_one_writequeue(struct connection *con) 14946ed7257bSPatrick Caulfield { 14955e9ccc37SChristine Caulfield struct writequeue_entry *e, *safe; 14966ed7257bSPatrick Caulfield 14976ed7257bSPatrick Caulfield spin_lock(&con->writequeue_lock); 14985e9ccc37SChristine Caulfield list_for_each_entry_safe(e, safe, &con->writequeue, list) { 14996ed7257bSPatrick Caulfield list_del(&e->list); 15006ed7257bSPatrick Caulfield free_entry(e); 15016ed7257bSPatrick Caulfield } 15026ed7257bSPatrick Caulfield spin_unlock(&con->writequeue_lock); 15036ed7257bSPatrick Caulfield } 15046ed7257bSPatrick Caulfield 15056ed7257bSPatrick Caulfield /* Called from recovery when it knows that a node has 15066ed7257bSPatrick Caulfield left the cluster */ 15076ed7257bSPatrick Caulfield int dlm_lowcomms_close(int nodeid) 15086ed7257bSPatrick Caulfield { 15096ed7257bSPatrick Caulfield struct connection *con; 151036b71a8bSDavid Teigland struct dlm_node_addr *na; 15116ed7257bSPatrick Caulfield 15126ed7257bSPatrick Caulfield log_print("closing connection to node %d", nodeid); 15136ed7257bSPatrick Caulfield con = nodeid2con(nodeid, 0); 15146ed7257bSPatrick Caulfield if (con) { 1515063c4c99SLars Marowsky-Bree set_bit(CF_CLOSE, &con->flags); 15160d737a8cSMarcelo Ricardo Leitner close_connection(con, true, true, true); 15176ed7257bSPatrick Caulfield clean_one_writequeue(con); 151853a5edaaSAlexander Aring if (con->othercon) 151953a5edaaSAlexander Aring clean_one_writequeue(con->othercon); 15206ed7257bSPatrick Caulfield } 152136b71a8bSDavid Teigland 152236b71a8bSDavid Teigland spin_lock(&dlm_node_addrs_spin); 152336b71a8bSDavid Teigland na = find_node_addr(nodeid); 152436b71a8bSDavid Teigland if (na) { 152536b71a8bSDavid Teigland list_del(&na->list); 152636b71a8bSDavid Teigland while (na->addr_count--) 152736b71a8bSDavid Teigland kfree(na->addr[na->addr_count]); 152836b71a8bSDavid Teigland kfree(na); 152936b71a8bSDavid Teigland } 153036b71a8bSDavid Teigland spin_unlock(&dlm_node_addrs_spin); 153136b71a8bSDavid Teigland 15326ed7257bSPatrick Caulfield return 0; 15336ed7257bSPatrick Caulfield } 15346ed7257bSPatrick Caulfield 15356ed7257bSPatrick Caulfield /* Receive workqueue function */ 15366ed7257bSPatrick Caulfield static void process_recv_sockets(struct work_struct *work) 15376ed7257bSPatrick Caulfield { 15386ed7257bSPatrick Caulfield struct connection *con = container_of(work, struct connection, rwork); 15396ed7257bSPatrick Caulfield int err; 15406ed7257bSPatrick Caulfield 15416ed7257bSPatrick Caulfield clear_bit(CF_READ_PENDING, &con->flags); 15426ed7257bSPatrick Caulfield do { 1543d11ccd45SAlexander Aring err = receive_from_sock(con); 15446ed7257bSPatrick Caulfield } while (!err); 15456ed7257bSPatrick Caulfield } 15466ed7257bSPatrick Caulfield 1547d11ccd45SAlexander Aring static void process_listen_recv_socket(struct work_struct *work) 1548d11ccd45SAlexander Aring { 1549d11ccd45SAlexander Aring accept_from_sock(&listen_con); 1550d11ccd45SAlexander Aring } 1551d11ccd45SAlexander Aring 15526ed7257bSPatrick Caulfield /* Send workqueue function */ 15536ed7257bSPatrick Caulfield static void process_send_sockets(struct work_struct *work) 15546ed7257bSPatrick Caulfield { 15556ed7257bSPatrick Caulfield struct connection *con = container_of(work, struct connection, swork); 15566ed7257bSPatrick Caulfield 15578a4abb08Stsutomu.owa@toshiba.co.jp clear_bit(CF_WRITE_PENDING, &con->flags); 155861d9102bSBob Peterson if (con->sock == NULL) /* not mutex protected so check it inside too */ 15596ed7257bSPatrick Caulfield con->connect_action(con); 156001da24d3SBob Peterson if (!list_empty(&con->writequeue)) 15616ed7257bSPatrick Caulfield send_to_sock(con); 15626ed7257bSPatrick Caulfield } 15636ed7257bSPatrick Caulfield 15646ed7257bSPatrick Caulfield static void work_stop(void) 15656ed7257bSPatrick Caulfield { 1566b355516fSDavid Windsor if (recv_workqueue) 15676ed7257bSPatrick Caulfield destroy_workqueue(recv_workqueue); 1568b355516fSDavid Windsor if (send_workqueue) 15696ed7257bSPatrick Caulfield destroy_workqueue(send_workqueue); 15706ed7257bSPatrick Caulfield } 15716ed7257bSPatrick Caulfield 15726ed7257bSPatrick Caulfield static int work_start(void) 15736ed7257bSPatrick Caulfield { 1574e43f055aSDavid Teigland recv_workqueue = alloc_workqueue("dlm_recv", 1575e43f055aSDavid Teigland WQ_UNBOUND | WQ_MEM_RECLAIM, 1); 1576b9d41052SNamhyung Kim if (!recv_workqueue) { 1577b9d41052SNamhyung Kim log_print("can't start dlm_recv"); 1578b9d41052SNamhyung Kim return -ENOMEM; 15796ed7257bSPatrick Caulfield } 15806ed7257bSPatrick Caulfield 1581e43f055aSDavid Teigland send_workqueue = alloc_workqueue("dlm_send", 1582e43f055aSDavid Teigland WQ_UNBOUND | WQ_MEM_RECLAIM, 1); 1583b9d41052SNamhyung Kim if (!send_workqueue) { 1584b9d41052SNamhyung Kim log_print("can't start dlm_send"); 15856ed7257bSPatrick Caulfield destroy_workqueue(recv_workqueue); 1586b9d41052SNamhyung Kim return -ENOMEM; 15876ed7257bSPatrick Caulfield } 15886ed7257bSPatrick Caulfield 15896ed7257bSPatrick Caulfield return 0; 15906ed7257bSPatrick Caulfield } 15916ed7257bSPatrick Caulfield 1592f0fb83cbStsutomu.owa@toshiba.co.jp static void _stop_conn(struct connection *con, bool and_other) 15936ed7257bSPatrick Caulfield { 1594f0fb83cbStsutomu.owa@toshiba.co.jp mutex_lock(&con->sock_mutex); 1595173a31feStsutomu.owa@toshiba.co.jp set_bit(CF_CLOSE, &con->flags); 1596f0fb83cbStsutomu.owa@toshiba.co.jp set_bit(CF_READ_PENDING, &con->flags); 15978a4abb08Stsutomu.owa@toshiba.co.jp set_bit(CF_WRITE_PENDING, &con->flags); 159893eaadebStsutomu.owa@toshiba.co.jp if (con->sock && con->sock->sk) { 159993eaadebStsutomu.owa@toshiba.co.jp write_lock_bh(&con->sock->sk->sk_callback_lock); 1600afb853fbSPatrick Caulfield con->sock->sk->sk_user_data = NULL; 160193eaadebStsutomu.owa@toshiba.co.jp write_unlock_bh(&con->sock->sk->sk_callback_lock); 160293eaadebStsutomu.owa@toshiba.co.jp } 1603f0fb83cbStsutomu.owa@toshiba.co.jp if (con->othercon && and_other) 1604f0fb83cbStsutomu.owa@toshiba.co.jp _stop_conn(con->othercon, false); 1605f0fb83cbStsutomu.owa@toshiba.co.jp mutex_unlock(&con->sock_mutex); 1606f0fb83cbStsutomu.owa@toshiba.co.jp } 1607f0fb83cbStsutomu.owa@toshiba.co.jp 1608f0fb83cbStsutomu.owa@toshiba.co.jp static void stop_conn(struct connection *con) 1609f0fb83cbStsutomu.owa@toshiba.co.jp { 1610f0fb83cbStsutomu.owa@toshiba.co.jp _stop_conn(con, true); 1611afb853fbSPatrick Caulfield } 16125e9ccc37SChristine Caulfield 1613055923bfSAlexander Aring static void shutdown_conn(struct connection *con) 1614055923bfSAlexander Aring { 1615055923bfSAlexander Aring if (con->shutdown_action) 1616055923bfSAlexander Aring con->shutdown_action(con); 1617055923bfSAlexander Aring } 1618055923bfSAlexander Aring 16194798cbbfSAlexander Aring static void connection_release(struct rcu_head *rcu) 16204798cbbfSAlexander Aring { 16214798cbbfSAlexander Aring struct connection *con = container_of(rcu, struct connection, rcu); 16224798cbbfSAlexander Aring 16234798cbbfSAlexander Aring kfree(con->rx_buf); 16244798cbbfSAlexander Aring kfree(con); 16254798cbbfSAlexander Aring } 16264798cbbfSAlexander Aring 16275e9ccc37SChristine Caulfield static void free_conn(struct connection *con) 16285e9ccc37SChristine Caulfield { 16290d737a8cSMarcelo Ricardo Leitner close_connection(con, true, true, true); 1630a47666ebSAlexander Aring spin_lock(&connections_lock); 1631a47666ebSAlexander Aring hlist_del_rcu(&con->list); 1632a47666ebSAlexander Aring spin_unlock(&connections_lock); 1633948c47e9SAlexander Aring if (con->othercon) { 1634948c47e9SAlexander Aring clean_one_writequeue(con->othercon); 16355cbec208SAlexander Aring call_srcu(&connections_srcu, &con->othercon->rcu, 16365cbec208SAlexander Aring connection_release); 1637948c47e9SAlexander Aring } 16380de98432SAlexander Aring clean_one_writequeue(con); 16395cbec208SAlexander Aring call_srcu(&connections_srcu, &con->rcu, connection_release); 16406ed7257bSPatrick Caulfield } 16415e9ccc37SChristine Caulfield 1642f0fb83cbStsutomu.owa@toshiba.co.jp static void work_flush(void) 1643f0fb83cbStsutomu.owa@toshiba.co.jp { 1644a47666ebSAlexander Aring int ok, idx; 1645f0fb83cbStsutomu.owa@toshiba.co.jp int i; 1646f0fb83cbStsutomu.owa@toshiba.co.jp struct connection *con; 1647f0fb83cbStsutomu.owa@toshiba.co.jp 1648f0fb83cbStsutomu.owa@toshiba.co.jp do { 1649f0fb83cbStsutomu.owa@toshiba.co.jp ok = 1; 1650f0fb83cbStsutomu.owa@toshiba.co.jp foreach_conn(stop_conn); 1651b355516fSDavid Windsor if (recv_workqueue) 1652f0fb83cbStsutomu.owa@toshiba.co.jp flush_workqueue(recv_workqueue); 1653b355516fSDavid Windsor if (send_workqueue) 1654f0fb83cbStsutomu.owa@toshiba.co.jp flush_workqueue(send_workqueue); 1655a47666ebSAlexander Aring idx = srcu_read_lock(&connections_srcu); 1656f0fb83cbStsutomu.owa@toshiba.co.jp for (i = 0; i < CONN_HASH_SIZE && ok; i++) { 1657a47666ebSAlexander Aring hlist_for_each_entry_rcu(con, &connection_hash[i], 1658a47666ebSAlexander Aring list) { 1659f0fb83cbStsutomu.owa@toshiba.co.jp ok &= test_bit(CF_READ_PENDING, &con->flags); 16608a4abb08Stsutomu.owa@toshiba.co.jp ok &= test_bit(CF_WRITE_PENDING, &con->flags); 16618a4abb08Stsutomu.owa@toshiba.co.jp if (con->othercon) { 1662f0fb83cbStsutomu.owa@toshiba.co.jp ok &= test_bit(CF_READ_PENDING, 1663f0fb83cbStsutomu.owa@toshiba.co.jp &con->othercon->flags); 16648a4abb08Stsutomu.owa@toshiba.co.jp ok &= test_bit(CF_WRITE_PENDING, 16658a4abb08Stsutomu.owa@toshiba.co.jp &con->othercon->flags); 16668a4abb08Stsutomu.owa@toshiba.co.jp } 1667f0fb83cbStsutomu.owa@toshiba.co.jp } 1668f0fb83cbStsutomu.owa@toshiba.co.jp } 1669a47666ebSAlexander Aring srcu_read_unlock(&connections_srcu, idx); 1670f0fb83cbStsutomu.owa@toshiba.co.jp } while (!ok); 1671f0fb83cbStsutomu.owa@toshiba.co.jp } 1672f0fb83cbStsutomu.owa@toshiba.co.jp 16735e9ccc37SChristine Caulfield void dlm_lowcomms_stop(void) 16745e9ccc37SChristine Caulfield { 16755e9ccc37SChristine Caulfield /* Set all the flags to prevent any 16765e9ccc37SChristine Caulfield socket activity. 16775e9ccc37SChristine Caulfield */ 1678513ef596SDavid Teigland dlm_allow_conn = 0; 1679aa7ab1e2SAlexander Aring 1680aa7ab1e2SAlexander Aring if (recv_workqueue) 1681aa7ab1e2SAlexander Aring flush_workqueue(recv_workqueue); 1682aa7ab1e2SAlexander Aring if (send_workqueue) 1683aa7ab1e2SAlexander Aring flush_workqueue(send_workqueue); 1684aa7ab1e2SAlexander Aring 1685d11ccd45SAlexander Aring dlm_close_sock(&listen_con.sock); 1686d11ccd45SAlexander Aring 1687055923bfSAlexander Aring foreach_conn(shutdown_conn); 1688f0fb83cbStsutomu.owa@toshiba.co.jp work_flush(); 16893a8db798SMarcelo Ricardo Leitner foreach_conn(free_conn); 16906ed7257bSPatrick Caulfield work_stop(); 1691043697f0SAlexander Aring deinit_local(); 16926ed7257bSPatrick Caulfield } 16936ed7257bSPatrick Caulfield 16946ed7257bSPatrick Caulfield int dlm_lowcomms_start(void) 16956ed7257bSPatrick Caulfield { 16966ed7257bSPatrick Caulfield int error = -EINVAL; 16975e9ccc37SChristine Caulfield int i; 16985e9ccc37SChristine Caulfield 16995e9ccc37SChristine Caulfield for (i = 0; i < CONN_HASH_SIZE; i++) 17005e9ccc37SChristine Caulfield INIT_HLIST_HEAD(&connection_hash[i]); 17016ed7257bSPatrick Caulfield 17026ed7257bSPatrick Caulfield init_local(); 17036ed7257bSPatrick Caulfield if (!dlm_local_count) { 1704617e82e1SDavid Teigland error = -ENOTCONN; 17056ed7257bSPatrick Caulfield log_print("no local IP address has been set"); 1706513ef596SDavid Teigland goto fail; 17076ed7257bSPatrick Caulfield } 17086ed7257bSPatrick Caulfield 1709d11ccd45SAlexander Aring INIT_WORK(&listen_con.rwork, process_listen_recv_socket); 1710d11ccd45SAlexander Aring 1711513ef596SDavid Teigland error = work_start(); 1712513ef596SDavid Teigland if (error) 1713a47666ebSAlexander Aring goto fail; 1714513ef596SDavid Teigland 1715513ef596SDavid Teigland dlm_allow_conn = 1; 17166ed7257bSPatrick Caulfield 17176ed7257bSPatrick Caulfield /* Start listening */ 17186ed7257bSPatrick Caulfield if (dlm_config.ci_protocol == 0) 17196ed7257bSPatrick Caulfield error = tcp_listen_for_all(); 17206ed7257bSPatrick Caulfield else 1721d11ccd45SAlexander Aring error = sctp_listen_for_all(&listen_con); 17226ed7257bSPatrick Caulfield if (error) 17236ed7257bSPatrick Caulfield goto fail_unlisten; 17246ed7257bSPatrick Caulfield 17256ed7257bSPatrick Caulfield return 0; 17266ed7257bSPatrick Caulfield 17276ed7257bSPatrick Caulfield fail_unlisten: 1728513ef596SDavid Teigland dlm_allow_conn = 0; 1729d11ccd45SAlexander Aring dlm_close_sock(&listen_con.sock); 1730513ef596SDavid Teigland fail: 17316ed7257bSPatrick Caulfield return error; 17326ed7257bSPatrick Caulfield } 173336b71a8bSDavid Teigland 173436b71a8bSDavid Teigland void dlm_lowcomms_exit(void) 173536b71a8bSDavid Teigland { 173636b71a8bSDavid Teigland struct dlm_node_addr *na, *safe; 173736b71a8bSDavid Teigland 173836b71a8bSDavid Teigland spin_lock(&dlm_node_addrs_spin); 173936b71a8bSDavid Teigland list_for_each_entry_safe(na, safe, &dlm_node_addrs, list) { 174036b71a8bSDavid Teigland list_del(&na->list); 174136b71a8bSDavid Teigland while (na->addr_count--) 174236b71a8bSDavid Teigland kfree(na->addr[na->addr_count]); 174336b71a8bSDavid Teigland kfree(na); 174436b71a8bSDavid Teigland } 174536b71a8bSDavid Teigland spin_unlock(&dlm_node_addrs_spin); 174636b71a8bSDavid Teigland } 1747