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; 119e125fbebSAlexander Aring int mark; 12036b71a8bSDavid Teigland int addr_count; 12198e1b60eSMike Christie int curr_addr_index; 12236b71a8bSDavid Teigland struct sockaddr_storage *addr[DLM_MAX_ADDR_COUNT]; 12336b71a8bSDavid Teigland }; 12436b71a8bSDavid Teigland 125cc661fc9SBob Peterson static struct listen_sock_callbacks { 126cc661fc9SBob Peterson void (*sk_error_report)(struct sock *); 127cc661fc9SBob Peterson void (*sk_data_ready)(struct sock *); 128cc661fc9SBob Peterson void (*sk_state_change)(struct sock *); 129cc661fc9SBob Peterson void (*sk_write_space)(struct sock *); 130cc661fc9SBob Peterson } listen_sock; 131cc661fc9SBob Peterson 13236b71a8bSDavid Teigland static LIST_HEAD(dlm_node_addrs); 13336b71a8bSDavid Teigland static DEFINE_SPINLOCK(dlm_node_addrs_spin); 13436b71a8bSDavid Teigland 135d11ccd45SAlexander Aring static struct listen_connection listen_con; 1366ed7257bSPatrick Caulfield static struct sockaddr_storage *dlm_local_addr[DLM_MAX_ADDR_COUNT]; 1376ed7257bSPatrick Caulfield static int dlm_local_count; 138*51746163SAlexander Aring int dlm_allow_conn; 1396ed7257bSPatrick Caulfield 1406ed7257bSPatrick Caulfield /* Work queues */ 1416ed7257bSPatrick Caulfield static struct workqueue_struct *recv_workqueue; 1426ed7257bSPatrick Caulfield static struct workqueue_struct *send_workqueue; 1436ed7257bSPatrick Caulfield 1445e9ccc37SChristine Caulfield static struct hlist_head connection_hash[CONN_HASH_SIZE]; 145a47666ebSAlexander Aring static DEFINE_SPINLOCK(connections_lock); 146a47666ebSAlexander Aring DEFINE_STATIC_SRCU(connections_srcu); 1476ed7257bSPatrick Caulfield 1486ed7257bSPatrick Caulfield static void process_recv_sockets(struct work_struct *work); 1496ed7257bSPatrick Caulfield static void process_send_sockets(struct work_struct *work); 1506ed7257bSPatrick Caulfield 1510672c3c2SAlexander Aring static void sctp_connect_to_sock(struct connection *con); 1520672c3c2SAlexander Aring static void tcp_connect_to_sock(struct connection *con); 15342873c90SAlexander Aring static void dlm_tcp_shutdown(struct connection *con); 1545e9ccc37SChristine Caulfield 1555e9ccc37SChristine Caulfield /* This is deliberately very simple because most clusters have simple 1565e9ccc37SChristine Caulfield sequential nodeids, so we should be able to go straight to a connection 1575e9ccc37SChristine Caulfield struct in the array */ 1585e9ccc37SChristine Caulfield static inline int nodeid_hash(int nodeid) 1595e9ccc37SChristine Caulfield { 1605e9ccc37SChristine Caulfield return nodeid & (CONN_HASH_SIZE-1); 1615e9ccc37SChristine Caulfield } 1625e9ccc37SChristine Caulfield 1635e9ccc37SChristine Caulfield static struct connection *__find_con(int nodeid) 1645e9ccc37SChristine Caulfield { 165a47666ebSAlexander Aring int r, idx; 1665e9ccc37SChristine Caulfield struct connection *con; 1675e9ccc37SChristine Caulfield 1685e9ccc37SChristine Caulfield r = nodeid_hash(nodeid); 1695e9ccc37SChristine Caulfield 170a47666ebSAlexander Aring idx = srcu_read_lock(&connections_srcu); 171a47666ebSAlexander Aring hlist_for_each_entry_rcu(con, &connection_hash[r], list) { 172a47666ebSAlexander Aring if (con->nodeid == nodeid) { 173a47666ebSAlexander Aring srcu_read_unlock(&connections_srcu, idx); 1745e9ccc37SChristine Caulfield return con; 1755e9ccc37SChristine Caulfield } 176a47666ebSAlexander Aring } 177a47666ebSAlexander Aring srcu_read_unlock(&connections_srcu, idx); 178a47666ebSAlexander Aring 1795e9ccc37SChristine Caulfield return NULL; 1805e9ccc37SChristine Caulfield } 1815e9ccc37SChristine Caulfield 1826cde210aSAlexander Aring static int dlm_con_init(struct connection *con, int nodeid) 1836ed7257bSPatrick Caulfield { 1844798cbbfSAlexander Aring con->rx_buflen = dlm_config.ci_buffer_size; 1854798cbbfSAlexander Aring con->rx_buf = kmalloc(con->rx_buflen, GFP_NOFS); 1866cde210aSAlexander Aring if (!con->rx_buf) 1876cde210aSAlexander Aring return -ENOMEM; 1884798cbbfSAlexander Aring 1896ed7257bSPatrick Caulfield con->nodeid = nodeid; 1906ed7257bSPatrick Caulfield mutex_init(&con->sock_mutex); 1916ed7257bSPatrick Caulfield INIT_LIST_HEAD(&con->writequeue); 1926ed7257bSPatrick Caulfield spin_lock_init(&con->writequeue_lock); 1936ed7257bSPatrick Caulfield INIT_WORK(&con->swork, process_send_sockets); 1946ed7257bSPatrick Caulfield INIT_WORK(&con->rwork, process_recv_sockets); 195055923bfSAlexander Aring init_waitqueue_head(&con->shutdown_wait); 1966ed7257bSPatrick Caulfield 19742873c90SAlexander Aring if (dlm_config.ci_protocol == 0) { 1980672c3c2SAlexander Aring con->connect_action = tcp_connect_to_sock; 19942873c90SAlexander Aring con->shutdown_action = dlm_tcp_shutdown; 20042873c90SAlexander Aring } else { 2010672c3c2SAlexander Aring con->connect_action = sctp_connect_to_sock; 20242873c90SAlexander Aring } 2036ed7257bSPatrick Caulfield 2046cde210aSAlexander Aring return 0; 2056cde210aSAlexander Aring } 2066cde210aSAlexander Aring 2076cde210aSAlexander Aring /* 2086cde210aSAlexander Aring * If 'allocation' is zero then we don't attempt to create a new 2096cde210aSAlexander Aring * connection structure for this node. 2106cde210aSAlexander Aring */ 2116cde210aSAlexander Aring static struct connection *nodeid2con(int nodeid, gfp_t alloc) 2126cde210aSAlexander Aring { 2136cde210aSAlexander Aring struct connection *con, *tmp; 2146cde210aSAlexander Aring int r, ret; 2156cde210aSAlexander Aring 2166cde210aSAlexander Aring con = __find_con(nodeid); 2176cde210aSAlexander Aring if (con || !alloc) 2186cde210aSAlexander Aring return con; 2196cde210aSAlexander Aring 2206cde210aSAlexander Aring con = kzalloc(sizeof(*con), alloc); 2216cde210aSAlexander Aring if (!con) 2226cde210aSAlexander Aring return NULL; 2236cde210aSAlexander Aring 2246cde210aSAlexander Aring ret = dlm_con_init(con, nodeid); 2256cde210aSAlexander Aring if (ret) { 2266cde210aSAlexander Aring kfree(con); 2276cde210aSAlexander Aring return NULL; 2286cde210aSAlexander Aring } 2296cde210aSAlexander Aring 230a47666ebSAlexander Aring r = nodeid_hash(nodeid); 231a47666ebSAlexander Aring 232a47666ebSAlexander Aring spin_lock(&connections_lock); 2334f2b30fdSAlexander Aring /* Because multiple workqueues/threads calls this function it can 2344f2b30fdSAlexander Aring * race on multiple cpu's. Instead of locking hot path __find_con() 2354f2b30fdSAlexander Aring * we just check in rare cases of recently added nodes again 2364f2b30fdSAlexander Aring * under protection of connections_lock. If this is the case we 2374f2b30fdSAlexander Aring * abort our connection creation and return the existing connection. 2384f2b30fdSAlexander Aring */ 2394f2b30fdSAlexander Aring tmp = __find_con(nodeid); 2404f2b30fdSAlexander Aring if (tmp) { 2414f2b30fdSAlexander Aring spin_unlock(&connections_lock); 2424f2b30fdSAlexander Aring kfree(con->rx_buf); 2434f2b30fdSAlexander Aring kfree(con); 2444f2b30fdSAlexander Aring return tmp; 2454f2b30fdSAlexander Aring } 2464f2b30fdSAlexander Aring 247a47666ebSAlexander Aring hlist_add_head_rcu(&con->list, &connection_hash[r]); 248a47666ebSAlexander Aring spin_unlock(&connections_lock); 249a47666ebSAlexander Aring 2506ed7257bSPatrick Caulfield return con; 2516ed7257bSPatrick Caulfield } 2526ed7257bSPatrick Caulfield 2535e9ccc37SChristine Caulfield /* Loop round all connections */ 2545e9ccc37SChristine Caulfield static void foreach_conn(void (*conn_func)(struct connection *c)) 2555e9ccc37SChristine Caulfield { 256a47666ebSAlexander Aring int i, idx; 2575e9ccc37SChristine Caulfield struct connection *con; 2585e9ccc37SChristine Caulfield 259a47666ebSAlexander Aring idx = srcu_read_lock(&connections_srcu); 2605e9ccc37SChristine Caulfield for (i = 0; i < CONN_HASH_SIZE; i++) { 261a47666ebSAlexander Aring hlist_for_each_entry_rcu(con, &connection_hash[i], list) 2625e9ccc37SChristine Caulfield conn_func(con); 2635e9ccc37SChristine Caulfield } 264a47666ebSAlexander Aring srcu_read_unlock(&connections_srcu, idx); 2656ed7257bSPatrick Caulfield } 2666ed7257bSPatrick Caulfield 26736b71a8bSDavid Teigland static struct dlm_node_addr *find_node_addr(int nodeid) 2686ed7257bSPatrick Caulfield { 26936b71a8bSDavid Teigland struct dlm_node_addr *na; 27036b71a8bSDavid Teigland 27136b71a8bSDavid Teigland list_for_each_entry(na, &dlm_node_addrs, list) { 27236b71a8bSDavid Teigland if (na->nodeid == nodeid) 27336b71a8bSDavid Teigland return na; 27436b71a8bSDavid Teigland } 27536b71a8bSDavid Teigland return NULL; 27636b71a8bSDavid Teigland } 27736b71a8bSDavid Teigland 27840c6b83eSAlexander Aring static int addr_compare(const struct sockaddr_storage *x, 27940c6b83eSAlexander Aring const struct sockaddr_storage *y) 28036b71a8bSDavid Teigland { 28136b71a8bSDavid Teigland switch (x->ss_family) { 28236b71a8bSDavid Teigland case AF_INET: { 28336b71a8bSDavid Teigland struct sockaddr_in *sinx = (struct sockaddr_in *)x; 28436b71a8bSDavid Teigland struct sockaddr_in *siny = (struct sockaddr_in *)y; 28536b71a8bSDavid Teigland if (sinx->sin_addr.s_addr != siny->sin_addr.s_addr) 28636b71a8bSDavid Teigland return 0; 28736b71a8bSDavid Teigland if (sinx->sin_port != siny->sin_port) 28836b71a8bSDavid Teigland return 0; 28936b71a8bSDavid Teigland break; 29036b71a8bSDavid Teigland } 29136b71a8bSDavid Teigland case AF_INET6: { 29236b71a8bSDavid Teigland struct sockaddr_in6 *sinx = (struct sockaddr_in6 *)x; 29336b71a8bSDavid Teigland struct sockaddr_in6 *siny = (struct sockaddr_in6 *)y; 29436b71a8bSDavid Teigland if (!ipv6_addr_equal(&sinx->sin6_addr, &siny->sin6_addr)) 29536b71a8bSDavid Teigland return 0; 29636b71a8bSDavid Teigland if (sinx->sin6_port != siny->sin6_port) 29736b71a8bSDavid Teigland return 0; 29836b71a8bSDavid Teigland break; 29936b71a8bSDavid Teigland } 30036b71a8bSDavid Teigland default: 30136b71a8bSDavid Teigland return 0; 30236b71a8bSDavid Teigland } 30336b71a8bSDavid Teigland return 1; 30436b71a8bSDavid Teigland } 30536b71a8bSDavid Teigland 30636b71a8bSDavid Teigland static int nodeid_to_addr(int nodeid, struct sockaddr_storage *sas_out, 307e125fbebSAlexander Aring struct sockaddr *sa_out, bool try_new_addr, 308e125fbebSAlexander Aring unsigned int *mark) 30936b71a8bSDavid Teigland { 31036b71a8bSDavid Teigland struct sockaddr_storage sas; 31136b71a8bSDavid Teigland struct dlm_node_addr *na; 3126ed7257bSPatrick Caulfield 3136ed7257bSPatrick Caulfield if (!dlm_local_count) 3146ed7257bSPatrick Caulfield return -1; 3156ed7257bSPatrick Caulfield 31636b71a8bSDavid Teigland spin_lock(&dlm_node_addrs_spin); 31736b71a8bSDavid Teigland na = find_node_addr(nodeid); 31898e1b60eSMike Christie if (na && na->addr_count) { 319ee44b4bcSMarcelo Ricardo Leitner memcpy(&sas, na->addr[na->curr_addr_index], 320ee44b4bcSMarcelo Ricardo Leitner sizeof(struct sockaddr_storage)); 321ee44b4bcSMarcelo Ricardo Leitner 32298e1b60eSMike Christie if (try_new_addr) { 32398e1b60eSMike Christie na->curr_addr_index++; 32498e1b60eSMike Christie if (na->curr_addr_index == na->addr_count) 32598e1b60eSMike Christie na->curr_addr_index = 0; 32698e1b60eSMike Christie } 32798e1b60eSMike Christie } 32836b71a8bSDavid Teigland spin_unlock(&dlm_node_addrs_spin); 32936b71a8bSDavid Teigland 33036b71a8bSDavid Teigland if (!na) 33136b71a8bSDavid Teigland return -EEXIST; 33236b71a8bSDavid Teigland 33336b71a8bSDavid Teigland if (!na->addr_count) 33436b71a8bSDavid Teigland return -ENOENT; 33536b71a8bSDavid Teigland 336e125fbebSAlexander Aring *mark = na->mark; 337e125fbebSAlexander Aring 33836b71a8bSDavid Teigland if (sas_out) 33936b71a8bSDavid Teigland memcpy(sas_out, &sas, sizeof(struct sockaddr_storage)); 34036b71a8bSDavid Teigland 34136b71a8bSDavid Teigland if (!sa_out) 34236b71a8bSDavid Teigland return 0; 3436ed7257bSPatrick Caulfield 3446ed7257bSPatrick Caulfield if (dlm_local_addr[0]->ss_family == AF_INET) { 34536b71a8bSDavid Teigland struct sockaddr_in *in4 = (struct sockaddr_in *) &sas; 34636b71a8bSDavid Teigland struct sockaddr_in *ret4 = (struct sockaddr_in *) sa_out; 3476ed7257bSPatrick Caulfield ret4->sin_addr.s_addr = in4->sin_addr.s_addr; 3486ed7257bSPatrick Caulfield } else { 34936b71a8bSDavid Teigland struct sockaddr_in6 *in6 = (struct sockaddr_in6 *) &sas; 35036b71a8bSDavid Teigland struct sockaddr_in6 *ret6 = (struct sockaddr_in6 *) sa_out; 3514e3fd7a0SAlexey Dobriyan ret6->sin6_addr = in6->sin6_addr; 3526ed7257bSPatrick Caulfield } 3536ed7257bSPatrick Caulfield 3546ed7257bSPatrick Caulfield return 0; 3556ed7257bSPatrick Caulfield } 3566ed7257bSPatrick Caulfield 357e125fbebSAlexander Aring static int addr_to_nodeid(struct sockaddr_storage *addr, int *nodeid, 358e125fbebSAlexander Aring unsigned int *mark) 35936b71a8bSDavid Teigland { 36036b71a8bSDavid Teigland struct dlm_node_addr *na; 36136b71a8bSDavid Teigland int rv = -EEXIST; 36298e1b60eSMike Christie int addr_i; 36336b71a8bSDavid Teigland 36436b71a8bSDavid Teigland spin_lock(&dlm_node_addrs_spin); 36536b71a8bSDavid Teigland list_for_each_entry(na, &dlm_node_addrs, list) { 36636b71a8bSDavid Teigland if (!na->addr_count) 36736b71a8bSDavid Teigland continue; 36836b71a8bSDavid Teigland 36998e1b60eSMike Christie for (addr_i = 0; addr_i < na->addr_count; addr_i++) { 37098e1b60eSMike Christie if (addr_compare(na->addr[addr_i], addr)) { 37136b71a8bSDavid Teigland *nodeid = na->nodeid; 372e125fbebSAlexander Aring *mark = na->mark; 37336b71a8bSDavid Teigland rv = 0; 37498e1b60eSMike Christie goto unlock; 37536b71a8bSDavid Teigland } 37698e1b60eSMike Christie } 37798e1b60eSMike Christie } 37898e1b60eSMike Christie unlock: 37936b71a8bSDavid Teigland spin_unlock(&dlm_node_addrs_spin); 38036b71a8bSDavid Teigland return rv; 38136b71a8bSDavid Teigland } 38236b71a8bSDavid Teigland 3834f19d071SAlexander Aring /* caller need to held dlm_node_addrs_spin lock */ 3844f19d071SAlexander Aring static bool dlm_lowcomms_na_has_addr(const struct dlm_node_addr *na, 3854f19d071SAlexander Aring const struct sockaddr_storage *addr) 3864f19d071SAlexander Aring { 3874f19d071SAlexander Aring int i; 3884f19d071SAlexander Aring 3894f19d071SAlexander Aring for (i = 0; i < na->addr_count; i++) { 3904f19d071SAlexander Aring if (addr_compare(na->addr[i], addr)) 3914f19d071SAlexander Aring return true; 3924f19d071SAlexander Aring } 3934f19d071SAlexander Aring 3944f19d071SAlexander Aring return false; 3954f19d071SAlexander Aring } 3964f19d071SAlexander Aring 39736b71a8bSDavid Teigland int dlm_lowcomms_addr(int nodeid, struct sockaddr_storage *addr, int len) 39836b71a8bSDavid Teigland { 39936b71a8bSDavid Teigland struct sockaddr_storage *new_addr; 40036b71a8bSDavid Teigland struct dlm_node_addr *new_node, *na; 4014f19d071SAlexander Aring bool ret; 40236b71a8bSDavid Teigland 40336b71a8bSDavid Teigland new_node = kzalloc(sizeof(struct dlm_node_addr), GFP_NOFS); 40436b71a8bSDavid Teigland if (!new_node) 40536b71a8bSDavid Teigland return -ENOMEM; 40636b71a8bSDavid Teigland 40736b71a8bSDavid Teigland new_addr = kzalloc(sizeof(struct sockaddr_storage), GFP_NOFS); 40836b71a8bSDavid Teigland if (!new_addr) { 40936b71a8bSDavid Teigland kfree(new_node); 41036b71a8bSDavid Teigland return -ENOMEM; 41136b71a8bSDavid Teigland } 41236b71a8bSDavid Teigland 41336b71a8bSDavid Teigland memcpy(new_addr, addr, len); 41436b71a8bSDavid Teigland 41536b71a8bSDavid Teigland spin_lock(&dlm_node_addrs_spin); 41636b71a8bSDavid Teigland na = find_node_addr(nodeid); 41736b71a8bSDavid Teigland if (!na) { 41836b71a8bSDavid Teigland new_node->nodeid = nodeid; 41936b71a8bSDavid Teigland new_node->addr[0] = new_addr; 42036b71a8bSDavid Teigland new_node->addr_count = 1; 421e125fbebSAlexander Aring new_node->mark = dlm_config.ci_mark; 42236b71a8bSDavid Teigland list_add(&new_node->list, &dlm_node_addrs); 42336b71a8bSDavid Teigland spin_unlock(&dlm_node_addrs_spin); 42436b71a8bSDavid Teigland return 0; 42536b71a8bSDavid Teigland } 42636b71a8bSDavid Teigland 4274f19d071SAlexander Aring ret = dlm_lowcomms_na_has_addr(na, addr); 4284f19d071SAlexander Aring if (ret) { 4294f19d071SAlexander Aring spin_unlock(&dlm_node_addrs_spin); 4304f19d071SAlexander Aring kfree(new_addr); 4314f19d071SAlexander Aring kfree(new_node); 4324f19d071SAlexander Aring return -EEXIST; 4334f19d071SAlexander Aring } 4344f19d071SAlexander Aring 43536b71a8bSDavid Teigland if (na->addr_count >= DLM_MAX_ADDR_COUNT) { 43636b71a8bSDavid Teigland spin_unlock(&dlm_node_addrs_spin); 43736b71a8bSDavid Teigland kfree(new_addr); 43836b71a8bSDavid Teigland kfree(new_node); 43936b71a8bSDavid Teigland return -ENOSPC; 44036b71a8bSDavid Teigland } 44136b71a8bSDavid Teigland 44236b71a8bSDavid Teigland na->addr[na->addr_count++] = new_addr; 44336b71a8bSDavid Teigland spin_unlock(&dlm_node_addrs_spin); 44436b71a8bSDavid Teigland kfree(new_node); 44536b71a8bSDavid Teigland return 0; 44636b71a8bSDavid Teigland } 44736b71a8bSDavid Teigland 4486ed7257bSPatrick Caulfield /* Data available on socket or listen socket received a connect */ 449676d2369SDavid S. Miller static void lowcomms_data_ready(struct sock *sk) 4506ed7257bSPatrick Caulfield { 45193eaadebStsutomu.owa@toshiba.co.jp struct connection *con; 45293eaadebStsutomu.owa@toshiba.co.jp 45393eaadebStsutomu.owa@toshiba.co.jp read_lock_bh(&sk->sk_callback_lock); 45493eaadebStsutomu.owa@toshiba.co.jp con = sock2con(sk); 455afb853fbSPatrick Caulfield if (con && !test_and_set_bit(CF_READ_PENDING, &con->flags)) 4566ed7257bSPatrick Caulfield queue_work(recv_workqueue, &con->rwork); 45793eaadebStsutomu.owa@toshiba.co.jp read_unlock_bh(&sk->sk_callback_lock); 4586ed7257bSPatrick Caulfield } 4596ed7257bSPatrick Caulfield 460d11ccd45SAlexander Aring static void lowcomms_listen_data_ready(struct sock *sk) 461d11ccd45SAlexander Aring { 462d11ccd45SAlexander Aring queue_work(recv_workqueue, &listen_con.rwork); 463d11ccd45SAlexander Aring } 464d11ccd45SAlexander Aring 4656ed7257bSPatrick Caulfield static void lowcomms_write_space(struct sock *sk) 4666ed7257bSPatrick Caulfield { 46793eaadebStsutomu.owa@toshiba.co.jp struct connection *con; 4686ed7257bSPatrick Caulfield 46993eaadebStsutomu.owa@toshiba.co.jp read_lock_bh(&sk->sk_callback_lock); 47093eaadebStsutomu.owa@toshiba.co.jp con = sock2con(sk); 471b36930ddSDavid Miller if (!con) 47293eaadebStsutomu.owa@toshiba.co.jp goto out; 473b36930ddSDavid Miller 47419633c7eSAlexander Aring if (!test_and_set_bit(CF_CONNECTED, &con->flags)) { 47519633c7eSAlexander Aring log_print("successful connected to node %d", con->nodeid); 47619633c7eSAlexander Aring queue_work(send_workqueue, &con->swork); 47719633c7eSAlexander Aring goto out; 47819633c7eSAlexander Aring } 47919633c7eSAlexander Aring 480b36930ddSDavid Miller clear_bit(SOCK_NOSPACE, &con->sock->flags); 481b36930ddSDavid Miller 482b36930ddSDavid Miller if (test_and_clear_bit(CF_APP_LIMITED, &con->flags)) { 483b36930ddSDavid Miller con->sock->sk->sk_write_pending--; 4849cd3e072SEric Dumazet clear_bit(SOCKWQ_ASYNC_NOSPACE, &con->sock->flags); 485b36930ddSDavid Miller } 486b36930ddSDavid Miller 4876ed7257bSPatrick Caulfield queue_work(send_workqueue, &con->swork); 48893eaadebStsutomu.owa@toshiba.co.jp out: 48993eaadebStsutomu.owa@toshiba.co.jp read_unlock_bh(&sk->sk_callback_lock); 4906ed7257bSPatrick Caulfield } 4916ed7257bSPatrick Caulfield 4926ed7257bSPatrick Caulfield static inline void lowcomms_connect_sock(struct connection *con) 4936ed7257bSPatrick Caulfield { 494063c4c99SLars Marowsky-Bree if (test_bit(CF_CLOSE, &con->flags)) 495063c4c99SLars Marowsky-Bree return; 4966ed7257bSPatrick Caulfield queue_work(send_workqueue, &con->swork); 49761d9102bSBob Peterson cond_resched(); 4986ed7257bSPatrick Caulfield } 4996ed7257bSPatrick Caulfield 5006ed7257bSPatrick Caulfield static void lowcomms_state_change(struct sock *sk) 5016ed7257bSPatrick Caulfield { 502ee44b4bcSMarcelo Ricardo Leitner /* SCTP layer is not calling sk_data_ready when the connection 503ee44b4bcSMarcelo Ricardo Leitner * is done, so we catch the signal through here. Also, it 504ee44b4bcSMarcelo Ricardo Leitner * doesn't switch socket state when entering shutdown, so we 505ee44b4bcSMarcelo Ricardo Leitner * skip the write in that case. 506ee44b4bcSMarcelo Ricardo Leitner */ 507ee44b4bcSMarcelo Ricardo Leitner if (sk->sk_shutdown) { 508ee44b4bcSMarcelo Ricardo Leitner if (sk->sk_shutdown == RCV_SHUTDOWN) 509ee44b4bcSMarcelo Ricardo Leitner lowcomms_data_ready(sk); 510ee44b4bcSMarcelo Ricardo Leitner } else if (sk->sk_state == TCP_ESTABLISHED) { 5116ed7257bSPatrick Caulfield lowcomms_write_space(sk); 5126ed7257bSPatrick Caulfield } 513ee44b4bcSMarcelo Ricardo Leitner } 5146ed7257bSPatrick Caulfield 515391fbdc5SChristine Caulfield int dlm_lowcomms_connect_node(int nodeid) 516391fbdc5SChristine Caulfield { 517391fbdc5SChristine Caulfield struct connection *con; 518391fbdc5SChristine Caulfield 519391fbdc5SChristine Caulfield if (nodeid == dlm_our_nodeid()) 520391fbdc5SChristine Caulfield return 0; 521391fbdc5SChristine Caulfield 522391fbdc5SChristine Caulfield con = nodeid2con(nodeid, GFP_NOFS); 523391fbdc5SChristine Caulfield if (!con) 524391fbdc5SChristine Caulfield return -ENOMEM; 525391fbdc5SChristine Caulfield lowcomms_connect_sock(con); 526391fbdc5SChristine Caulfield return 0; 527391fbdc5SChristine Caulfield } 528391fbdc5SChristine Caulfield 529e125fbebSAlexander Aring int dlm_lowcomms_nodes_set_mark(int nodeid, unsigned int mark) 530e125fbebSAlexander Aring { 531e125fbebSAlexander Aring struct dlm_node_addr *na; 532e125fbebSAlexander Aring 533e125fbebSAlexander Aring spin_lock(&dlm_node_addrs_spin); 534e125fbebSAlexander Aring na = find_node_addr(nodeid); 535e125fbebSAlexander Aring if (!na) { 536e125fbebSAlexander Aring spin_unlock(&dlm_node_addrs_spin); 537e125fbebSAlexander Aring return -ENOENT; 538e125fbebSAlexander Aring } 539e125fbebSAlexander Aring 540e125fbebSAlexander Aring na->mark = mark; 541e125fbebSAlexander Aring spin_unlock(&dlm_node_addrs_spin); 542e125fbebSAlexander Aring 543e125fbebSAlexander Aring return 0; 544e125fbebSAlexander Aring } 545e125fbebSAlexander Aring 546b3a5bbfdSBob Peterson static void lowcomms_error_report(struct sock *sk) 547b3a5bbfdSBob Peterson { 548b81171cbSBob Peterson struct connection *con; 549b3a5bbfdSBob Peterson struct sockaddr_storage saddr; 550b81171cbSBob Peterson void (*orig_report)(struct sock *) = NULL; 551b3a5bbfdSBob Peterson 552b81171cbSBob Peterson read_lock_bh(&sk->sk_callback_lock); 553b81171cbSBob Peterson con = sock2con(sk); 554b81171cbSBob Peterson if (con == NULL) 555b81171cbSBob Peterson goto out; 556b81171cbSBob Peterson 557cc661fc9SBob Peterson orig_report = listen_sock.sk_error_report; 5581a31833dSBob Peterson if (con->sock == NULL || 5599b2c45d4SDenys Vlasenko kernel_getpeername(con->sock, (struct sockaddr *)&saddr) < 0) { 560b3a5bbfdSBob Peterson printk_ratelimited(KERN_ERR "dlm: node %d: socket error " 561b3a5bbfdSBob Peterson "sending to node %d, port %d, " 562b3a5bbfdSBob Peterson "sk_err=%d/%d\n", dlm_our_nodeid(), 563b3a5bbfdSBob Peterson con->nodeid, dlm_config.ci_tcp_port, 564b3a5bbfdSBob Peterson sk->sk_err, sk->sk_err_soft); 565b3a5bbfdSBob Peterson } else if (saddr.ss_family == AF_INET) { 566b3a5bbfdSBob Peterson struct sockaddr_in *sin4 = (struct sockaddr_in *)&saddr; 567b3a5bbfdSBob Peterson 568b3a5bbfdSBob Peterson printk_ratelimited(KERN_ERR "dlm: node %d: socket error " 569b3a5bbfdSBob Peterson "sending to node %d at %pI4, port %d, " 570b3a5bbfdSBob Peterson "sk_err=%d/%d\n", dlm_our_nodeid(), 571b3a5bbfdSBob Peterson con->nodeid, &sin4->sin_addr.s_addr, 572b3a5bbfdSBob Peterson dlm_config.ci_tcp_port, sk->sk_err, 573b3a5bbfdSBob Peterson sk->sk_err_soft); 574b3a5bbfdSBob Peterson } else { 575b3a5bbfdSBob Peterson struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&saddr; 576b3a5bbfdSBob Peterson 577b3a5bbfdSBob Peterson printk_ratelimited(KERN_ERR "dlm: node %d: socket error " 578b3a5bbfdSBob Peterson "sending to node %d at %u.%u.%u.%u, " 579b3a5bbfdSBob Peterson "port %d, sk_err=%d/%d\n", dlm_our_nodeid(), 580b3a5bbfdSBob Peterson con->nodeid, sin6->sin6_addr.s6_addr32[0], 581b3a5bbfdSBob Peterson sin6->sin6_addr.s6_addr32[1], 582b3a5bbfdSBob Peterson sin6->sin6_addr.s6_addr32[2], 583b3a5bbfdSBob Peterson sin6->sin6_addr.s6_addr32[3], 584b3a5bbfdSBob Peterson dlm_config.ci_tcp_port, sk->sk_err, 585b3a5bbfdSBob Peterson sk->sk_err_soft); 586b3a5bbfdSBob Peterson } 587b81171cbSBob Peterson out: 588b81171cbSBob Peterson read_unlock_bh(&sk->sk_callback_lock); 589b81171cbSBob Peterson if (orig_report) 590b81171cbSBob Peterson orig_report(sk); 591b81171cbSBob Peterson } 592b81171cbSBob Peterson 593b81171cbSBob Peterson /* Note: sk_callback_lock must be locked before calling this function. */ 594cc661fc9SBob Peterson static void save_listen_callbacks(struct socket *sock) 595b81171cbSBob Peterson { 596cc661fc9SBob Peterson struct sock *sk = sock->sk; 597cc661fc9SBob Peterson 598cc661fc9SBob Peterson listen_sock.sk_data_ready = sk->sk_data_ready; 599cc661fc9SBob Peterson listen_sock.sk_state_change = sk->sk_state_change; 600cc661fc9SBob Peterson listen_sock.sk_write_space = sk->sk_write_space; 601cc661fc9SBob Peterson listen_sock.sk_error_report = sk->sk_error_report; 602b81171cbSBob Peterson } 603b81171cbSBob Peterson 604cc661fc9SBob Peterson static void restore_callbacks(struct socket *sock) 605b81171cbSBob Peterson { 606cc661fc9SBob Peterson struct sock *sk = sock->sk; 607cc661fc9SBob Peterson 608b81171cbSBob Peterson write_lock_bh(&sk->sk_callback_lock); 609b81171cbSBob Peterson sk->sk_user_data = NULL; 610cc661fc9SBob Peterson sk->sk_data_ready = listen_sock.sk_data_ready; 611cc661fc9SBob Peterson sk->sk_state_change = listen_sock.sk_state_change; 612cc661fc9SBob Peterson sk->sk_write_space = listen_sock.sk_write_space; 613cc661fc9SBob Peterson sk->sk_error_report = listen_sock.sk_error_report; 614b81171cbSBob Peterson write_unlock_bh(&sk->sk_callback_lock); 615b3a5bbfdSBob Peterson } 616b3a5bbfdSBob Peterson 617d11ccd45SAlexander Aring static void add_listen_sock(struct socket *sock, struct listen_connection *con) 618d11ccd45SAlexander Aring { 619d11ccd45SAlexander Aring struct sock *sk = sock->sk; 620d11ccd45SAlexander Aring 621d11ccd45SAlexander Aring write_lock_bh(&sk->sk_callback_lock); 622d11ccd45SAlexander Aring save_listen_callbacks(sock); 623d11ccd45SAlexander Aring con->sock = sock; 624d11ccd45SAlexander Aring 625d11ccd45SAlexander Aring sk->sk_user_data = con; 626d11ccd45SAlexander Aring sk->sk_allocation = GFP_NOFS; 627d11ccd45SAlexander Aring /* Install a data_ready callback */ 628d11ccd45SAlexander Aring sk->sk_data_ready = lowcomms_listen_data_ready; 629d11ccd45SAlexander Aring write_unlock_bh(&sk->sk_callback_lock); 630d11ccd45SAlexander Aring } 631d11ccd45SAlexander Aring 6326ed7257bSPatrick Caulfield /* Make a socket active */ 633988419a9Stsutomu.owa@toshiba.co.jp static void add_sock(struct socket *sock, struct connection *con) 6346ed7257bSPatrick Caulfield { 635b81171cbSBob Peterson struct sock *sk = sock->sk; 636b81171cbSBob Peterson 637b81171cbSBob Peterson write_lock_bh(&sk->sk_callback_lock); 6386ed7257bSPatrick Caulfield con->sock = sock; 6396ed7257bSPatrick Caulfield 640b81171cbSBob Peterson sk->sk_user_data = con; 6416ed7257bSPatrick Caulfield /* Install a data_ready callback */ 642b81171cbSBob Peterson sk->sk_data_ready = lowcomms_data_ready; 643b81171cbSBob Peterson sk->sk_write_space = lowcomms_write_space; 644b81171cbSBob Peterson sk->sk_state_change = lowcomms_state_change; 645b81171cbSBob Peterson sk->sk_allocation = GFP_NOFS; 646b81171cbSBob Peterson sk->sk_error_report = lowcomms_error_report; 647b81171cbSBob Peterson write_unlock_bh(&sk->sk_callback_lock); 6486ed7257bSPatrick Caulfield } 6496ed7257bSPatrick Caulfield 6506ed7257bSPatrick Caulfield /* Add the port number to an IPv6 or 4 sockaddr and return the address 6516ed7257bSPatrick Caulfield length */ 6526ed7257bSPatrick Caulfield static void make_sockaddr(struct sockaddr_storage *saddr, uint16_t port, 6536ed7257bSPatrick Caulfield int *addr_len) 6546ed7257bSPatrick Caulfield { 6556ed7257bSPatrick Caulfield saddr->ss_family = dlm_local_addr[0]->ss_family; 6566ed7257bSPatrick Caulfield if (saddr->ss_family == AF_INET) { 6576ed7257bSPatrick Caulfield struct sockaddr_in *in4_addr = (struct sockaddr_in *)saddr; 6586ed7257bSPatrick Caulfield in4_addr->sin_port = cpu_to_be16(port); 6596ed7257bSPatrick Caulfield *addr_len = sizeof(struct sockaddr_in); 6606ed7257bSPatrick Caulfield memset(&in4_addr->sin_zero, 0, sizeof(in4_addr->sin_zero)); 6616ed7257bSPatrick Caulfield } else { 6626ed7257bSPatrick Caulfield struct sockaddr_in6 *in6_addr = (struct sockaddr_in6 *)saddr; 6636ed7257bSPatrick Caulfield in6_addr->sin6_port = cpu_to_be16(port); 6646ed7257bSPatrick Caulfield *addr_len = sizeof(struct sockaddr_in6); 6656ed7257bSPatrick Caulfield } 66601c8cab2SPatrick Caulfield memset((char *)saddr + *addr_len, 0, sizeof(struct sockaddr_storage) - *addr_len); 6676ed7257bSPatrick Caulfield } 6686ed7257bSPatrick Caulfield 669d11ccd45SAlexander Aring static void dlm_close_sock(struct socket **sock) 670d11ccd45SAlexander Aring { 671d11ccd45SAlexander Aring if (*sock) { 672d11ccd45SAlexander Aring restore_callbacks(*sock); 673d11ccd45SAlexander Aring sock_release(*sock); 674d11ccd45SAlexander Aring *sock = NULL; 675d11ccd45SAlexander Aring } 676d11ccd45SAlexander Aring } 677d11ccd45SAlexander Aring 6786ed7257bSPatrick Caulfield /* Close a remote connection and tidy up */ 6790d737a8cSMarcelo Ricardo Leitner static void close_connection(struct connection *con, bool and_other, 6800d737a8cSMarcelo Ricardo Leitner bool tx, bool rx) 6816ed7257bSPatrick Caulfield { 682b2a66629Stsutomu.owa@toshiba.co.jp bool closing = test_and_set_bit(CF_CLOSING, &con->flags); 683b2a66629Stsutomu.owa@toshiba.co.jp 6840aa18464Stsutomu.owa@toshiba.co.jp if (tx && !closing && cancel_work_sync(&con->swork)) { 6850d737a8cSMarcelo Ricardo Leitner log_print("canceled swork for node %d", con->nodeid); 6860aa18464Stsutomu.owa@toshiba.co.jp clear_bit(CF_WRITE_PENDING, &con->flags); 6870aa18464Stsutomu.owa@toshiba.co.jp } 6880aa18464Stsutomu.owa@toshiba.co.jp if (rx && !closing && cancel_work_sync(&con->rwork)) { 6890d737a8cSMarcelo Ricardo Leitner log_print("canceled rwork for node %d", con->nodeid); 6900aa18464Stsutomu.owa@toshiba.co.jp clear_bit(CF_READ_PENDING, &con->flags); 6910aa18464Stsutomu.owa@toshiba.co.jp } 6926ed7257bSPatrick Caulfield 6930d737a8cSMarcelo Ricardo Leitner mutex_lock(&con->sock_mutex); 694d11ccd45SAlexander Aring dlm_close_sock(&con->sock); 695d11ccd45SAlexander Aring 6966ed7257bSPatrick Caulfield if (con->othercon && and_other) { 6976ed7257bSPatrick Caulfield /* Will only re-enter once. */ 6980d737a8cSMarcelo Ricardo Leitner close_connection(con->othercon, false, true, true); 6996ed7257bSPatrick Caulfield } 7009e5f2825SPatrick Caulfield 7014798cbbfSAlexander Aring con->rx_leftover = 0; 7026ed7257bSPatrick Caulfield con->retries = 0; 70319633c7eSAlexander Aring clear_bit(CF_CONNECTED, &con->flags); 7046ed7257bSPatrick Caulfield mutex_unlock(&con->sock_mutex); 705b2a66629Stsutomu.owa@toshiba.co.jp clear_bit(CF_CLOSING, &con->flags); 7066ed7257bSPatrick Caulfield } 7076ed7257bSPatrick Caulfield 708055923bfSAlexander Aring static void shutdown_connection(struct connection *con) 709055923bfSAlexander Aring { 710055923bfSAlexander Aring int ret; 711055923bfSAlexander Aring 712055923bfSAlexander Aring if (cancel_work_sync(&con->swork)) { 713055923bfSAlexander Aring log_print("canceled swork for node %d", con->nodeid); 714055923bfSAlexander Aring clear_bit(CF_WRITE_PENDING, &con->flags); 715055923bfSAlexander Aring } 716055923bfSAlexander Aring 717055923bfSAlexander Aring mutex_lock(&con->sock_mutex); 718055923bfSAlexander Aring /* nothing to shutdown */ 719055923bfSAlexander Aring if (!con->sock) { 720055923bfSAlexander Aring mutex_unlock(&con->sock_mutex); 721055923bfSAlexander Aring return; 722055923bfSAlexander Aring } 723055923bfSAlexander Aring 724055923bfSAlexander Aring set_bit(CF_SHUTDOWN, &con->flags); 725055923bfSAlexander Aring ret = kernel_sock_shutdown(con->sock, SHUT_WR); 726055923bfSAlexander Aring mutex_unlock(&con->sock_mutex); 727055923bfSAlexander Aring if (ret) { 728055923bfSAlexander Aring log_print("Connection %p failed to shutdown: %d will force close", 729055923bfSAlexander Aring con, ret); 730055923bfSAlexander Aring goto force_close; 731055923bfSAlexander Aring } else { 732055923bfSAlexander Aring ret = wait_event_timeout(con->shutdown_wait, 733055923bfSAlexander Aring !test_bit(CF_SHUTDOWN, &con->flags), 734055923bfSAlexander Aring DLM_SHUTDOWN_WAIT_TIMEOUT); 735055923bfSAlexander Aring if (ret == 0) { 736055923bfSAlexander Aring log_print("Connection %p shutdown timed out, will force close", 737055923bfSAlexander Aring con); 738055923bfSAlexander Aring goto force_close; 739055923bfSAlexander Aring } 740055923bfSAlexander Aring } 741055923bfSAlexander Aring 742055923bfSAlexander Aring return; 743055923bfSAlexander Aring 744055923bfSAlexander Aring force_close: 745055923bfSAlexander Aring clear_bit(CF_SHUTDOWN, &con->flags); 746055923bfSAlexander Aring close_connection(con, false, true, true); 747055923bfSAlexander Aring } 748055923bfSAlexander Aring 749055923bfSAlexander Aring static void dlm_tcp_shutdown(struct connection *con) 750055923bfSAlexander Aring { 751055923bfSAlexander Aring if (con->othercon) 752055923bfSAlexander Aring shutdown_connection(con->othercon); 753055923bfSAlexander Aring shutdown_connection(con); 754055923bfSAlexander Aring } 755055923bfSAlexander Aring 7564798cbbfSAlexander Aring static int con_realloc_receive_buf(struct connection *con, int newlen) 7574798cbbfSAlexander Aring { 7584798cbbfSAlexander Aring unsigned char *newbuf; 7594798cbbfSAlexander Aring 7604798cbbfSAlexander Aring newbuf = kmalloc(newlen, GFP_NOFS); 7614798cbbfSAlexander Aring if (!newbuf) 7624798cbbfSAlexander Aring return -ENOMEM; 7634798cbbfSAlexander Aring 7644798cbbfSAlexander Aring /* copy any leftover from last receive */ 7654798cbbfSAlexander Aring if (con->rx_leftover) 7664798cbbfSAlexander Aring memmove(newbuf, con->rx_buf, con->rx_leftover); 7674798cbbfSAlexander Aring 7684798cbbfSAlexander Aring /* swap to new buffer space */ 7694798cbbfSAlexander Aring kfree(con->rx_buf); 7704798cbbfSAlexander Aring con->rx_buflen = newlen; 7714798cbbfSAlexander Aring con->rx_buf = newbuf; 7724798cbbfSAlexander Aring 7734798cbbfSAlexander Aring return 0; 7744798cbbfSAlexander Aring } 7754798cbbfSAlexander Aring 7766ed7257bSPatrick Caulfield /* Data received from remote end */ 7776ed7257bSPatrick Caulfield static int receive_from_sock(struct connection *con) 7786ed7257bSPatrick Caulfield { 7796ed7257bSPatrick Caulfield int call_again_soon = 0; 7804798cbbfSAlexander Aring struct msghdr msg; 7814798cbbfSAlexander Aring struct kvec iov; 7824798cbbfSAlexander Aring int ret, buflen; 7836ed7257bSPatrick Caulfield 7846ed7257bSPatrick Caulfield mutex_lock(&con->sock_mutex); 7856ed7257bSPatrick Caulfield 7866ed7257bSPatrick Caulfield if (con->sock == NULL) { 7876ed7257bSPatrick Caulfield ret = -EAGAIN; 7886ed7257bSPatrick Caulfield goto out_close; 7896ed7257bSPatrick Caulfield } 7904798cbbfSAlexander Aring 7914798cbbfSAlexander Aring /* realloc if we get new buffer size to read out */ 7924798cbbfSAlexander Aring buflen = dlm_config.ci_buffer_size; 7934798cbbfSAlexander Aring if (con->rx_buflen != buflen && con->rx_leftover <= buflen) { 7944798cbbfSAlexander Aring ret = con_realloc_receive_buf(con, buflen); 7954798cbbfSAlexander Aring if (ret < 0) 7966ed7257bSPatrick Caulfield goto out_resched; 7976ed7257bSPatrick Caulfield } 7986ed7257bSPatrick Caulfield 7994798cbbfSAlexander Aring /* calculate new buffer parameter regarding last receive and 8004798cbbfSAlexander Aring * possible leftover bytes 8016ed7257bSPatrick Caulfield */ 8024798cbbfSAlexander Aring iov.iov_base = con->rx_buf + con->rx_leftover; 8034798cbbfSAlexander Aring iov.iov_len = con->rx_buflen - con->rx_leftover; 8046ed7257bSPatrick Caulfield 8054798cbbfSAlexander Aring memset(&msg, 0, sizeof(msg)); 8064798cbbfSAlexander Aring msg.msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL; 8074798cbbfSAlexander Aring ret = kernel_recvmsg(con->sock, &msg, &iov, 1, iov.iov_len, 8084798cbbfSAlexander Aring msg.msg_flags); 8096ed7257bSPatrick Caulfield if (ret <= 0) 8106ed7257bSPatrick Caulfield goto out_close; 8114798cbbfSAlexander Aring else if (ret == iov.iov_len) 812ee44b4bcSMarcelo Ricardo Leitner call_again_soon = 1; 8136ed7257bSPatrick Caulfield 8144798cbbfSAlexander Aring /* new buflen according readed bytes and leftover from last receive */ 8154798cbbfSAlexander Aring buflen = ret + con->rx_leftover; 8164798cbbfSAlexander Aring ret = dlm_process_incoming_buffer(con->nodeid, con->rx_buf, buflen); 8174798cbbfSAlexander Aring if (ret < 0) 8184798cbbfSAlexander Aring goto out_close; 8196ed7257bSPatrick Caulfield 8204798cbbfSAlexander Aring /* calculate leftover bytes from process and put it into begin of 8214798cbbfSAlexander Aring * the receive buffer, so next receive we have the full message 8224798cbbfSAlexander Aring * at the start address of the receive buffer. 8234798cbbfSAlexander Aring */ 8244798cbbfSAlexander Aring con->rx_leftover = buflen - ret; 8254798cbbfSAlexander Aring if (con->rx_leftover) { 8264798cbbfSAlexander Aring memmove(con->rx_buf, con->rx_buf + ret, 8274798cbbfSAlexander Aring con->rx_leftover); 8284798cbbfSAlexander Aring call_again_soon = true; 8296ed7257bSPatrick Caulfield } 8306ed7257bSPatrick Caulfield 8316ed7257bSPatrick Caulfield if (call_again_soon) 8326ed7257bSPatrick Caulfield goto out_resched; 8334798cbbfSAlexander Aring 8346ed7257bSPatrick Caulfield mutex_unlock(&con->sock_mutex); 8356ed7257bSPatrick Caulfield return 0; 8366ed7257bSPatrick Caulfield 8376ed7257bSPatrick Caulfield out_resched: 8386ed7257bSPatrick Caulfield if (!test_and_set_bit(CF_READ_PENDING, &con->flags)) 8396ed7257bSPatrick Caulfield queue_work(recv_workqueue, &con->rwork); 8406ed7257bSPatrick Caulfield mutex_unlock(&con->sock_mutex); 8416ed7257bSPatrick Caulfield return -EAGAIN; 8426ed7257bSPatrick Caulfield 8436ed7257bSPatrick Caulfield out_close: 8446ed7257bSPatrick Caulfield mutex_unlock(&con->sock_mutex); 8459e5f2825SPatrick Caulfield if (ret != -EAGAIN) { 8466ed7257bSPatrick Caulfield /* Reconnect when there is something to send */ 847055923bfSAlexander Aring close_connection(con, false, true, false); 848055923bfSAlexander Aring if (ret == 0) { 849055923bfSAlexander Aring log_print("connection %p got EOF from %d", 850055923bfSAlexander Aring con, con->nodeid); 851055923bfSAlexander Aring /* handling for tcp shutdown */ 852055923bfSAlexander Aring clear_bit(CF_SHUTDOWN, &con->flags); 853055923bfSAlexander Aring wake_up(&con->shutdown_wait); 854055923bfSAlexander Aring /* signal to breaking receive worker */ 855055923bfSAlexander Aring ret = -1; 8566ed7257bSPatrick Caulfield } 857055923bfSAlexander Aring } 8586ed7257bSPatrick Caulfield return ret; 8596ed7257bSPatrick Caulfield } 8606ed7257bSPatrick Caulfield 8616ed7257bSPatrick Caulfield /* Listening socket is busy, accept a connection */ 862d11ccd45SAlexander Aring static int accept_from_sock(struct listen_connection *con) 8636ed7257bSPatrick Caulfield { 8646ed7257bSPatrick Caulfield int result; 8656ed7257bSPatrick Caulfield struct sockaddr_storage peeraddr; 8666ed7257bSPatrick Caulfield struct socket *newsock; 8676ed7257bSPatrick Caulfield int len; 8686ed7257bSPatrick Caulfield int nodeid; 8696ed7257bSPatrick Caulfield struct connection *newcon; 8706ed7257bSPatrick Caulfield struct connection *addcon; 8713f78cd7dSAlexander Aring unsigned int mark; 8726ed7257bSPatrick Caulfield 873513ef596SDavid Teigland if (!dlm_allow_conn) { 874513ef596SDavid Teigland return -1; 875513ef596SDavid Teigland } 876513ef596SDavid Teigland 877d11ccd45SAlexander Aring if (!con->sock) 8783421fb15Stsutomu.owa@toshiba.co.jp return -ENOTCONN; 8796ed7257bSPatrick Caulfield 8803421fb15Stsutomu.owa@toshiba.co.jp result = kernel_accept(con->sock, &newsock, O_NONBLOCK); 8816ed7257bSPatrick Caulfield if (result < 0) 8826ed7257bSPatrick Caulfield goto accept_err; 8836ed7257bSPatrick Caulfield 8846ed7257bSPatrick Caulfield /* Get the connected socket's peer */ 8856ed7257bSPatrick Caulfield memset(&peeraddr, 0, sizeof(peeraddr)); 8869b2c45d4SDenys Vlasenko len = newsock->ops->getname(newsock, (struct sockaddr *)&peeraddr, 2); 8879b2c45d4SDenys Vlasenko if (len < 0) { 8886ed7257bSPatrick Caulfield result = -ECONNABORTED; 8896ed7257bSPatrick Caulfield goto accept_err; 8906ed7257bSPatrick Caulfield } 8916ed7257bSPatrick Caulfield 8926ed7257bSPatrick Caulfield /* Get the new node's NODEID */ 8936ed7257bSPatrick Caulfield make_sockaddr(&peeraddr, 0, &len); 894e125fbebSAlexander Aring if (addr_to_nodeid(&peeraddr, &nodeid, &mark)) { 895bcaadf5cSMasatake YAMATO unsigned char *b=(unsigned char *)&peeraddr; 896617e82e1SDavid Teigland log_print("connect from non cluster node"); 897bcaadf5cSMasatake YAMATO print_hex_dump_bytes("ss: ", DUMP_PREFIX_NONE, 898bcaadf5cSMasatake YAMATO b, sizeof(struct sockaddr_storage)); 8996ed7257bSPatrick Caulfield sock_release(newsock); 9006ed7257bSPatrick Caulfield return -1; 9016ed7257bSPatrick Caulfield } 9026ed7257bSPatrick Caulfield 9036ed7257bSPatrick Caulfield log_print("got connection from %d", nodeid); 9046ed7257bSPatrick Caulfield 9056ed7257bSPatrick Caulfield /* Check to see if we already have a connection to this node. This 9066ed7257bSPatrick Caulfield * could happen if the two nodes initiate a connection at roughly 9076ed7257bSPatrick Caulfield * the same time and the connections cross on the wire. 9086ed7257bSPatrick Caulfield * In this case we store the incoming one in "othercon" 9096ed7257bSPatrick Caulfield */ 910748285ccSDavid Teigland newcon = nodeid2con(nodeid, GFP_NOFS); 9116ed7257bSPatrick Caulfield if (!newcon) { 9126ed7257bSPatrick Caulfield result = -ENOMEM; 9136ed7257bSPatrick Caulfield goto accept_err; 9146ed7257bSPatrick Caulfield } 915d11ccd45SAlexander Aring 916e125fbebSAlexander Aring sock_set_mark(newsock->sk, mark); 917e125fbebSAlexander Aring 918d11ccd45SAlexander Aring mutex_lock(&newcon->sock_mutex); 9196ed7257bSPatrick Caulfield if (newcon->sock) { 9206ed7257bSPatrick Caulfield struct connection *othercon = newcon->othercon; 9216ed7257bSPatrick Caulfield 9226ed7257bSPatrick Caulfield if (!othercon) { 923a47666ebSAlexander Aring othercon = kzalloc(sizeof(*othercon), GFP_NOFS); 9246ed7257bSPatrick Caulfield if (!othercon) { 925617e82e1SDavid Teigland log_print("failed to allocate incoming socket"); 9266ed7257bSPatrick Caulfield mutex_unlock(&newcon->sock_mutex); 9276ed7257bSPatrick Caulfield result = -ENOMEM; 9286ed7257bSPatrick Caulfield goto accept_err; 9296ed7257bSPatrick Caulfield } 9304798cbbfSAlexander Aring 9316cde210aSAlexander Aring result = dlm_con_init(othercon, nodeid); 9326cde210aSAlexander Aring if (result < 0) { 9334798cbbfSAlexander Aring kfree(othercon); 9344798cbbfSAlexander Aring goto accept_err; 9354798cbbfSAlexander Aring } 9364798cbbfSAlexander Aring 937e9a470acSAlexander Aring lockdep_set_subclass(&othercon->sock_mutex, 1); 9386cde210aSAlexander Aring newcon->othercon = othercon; 939ba3ab3caSAlexander Aring } else { 940ba3ab3caSAlexander Aring /* close other sock con if we have something new */ 941ba3ab3caSAlexander Aring close_connection(othercon, false, true, false); 94261d96be0SPatrick Caulfield } 943ba3ab3caSAlexander Aring 944e9a470acSAlexander Aring mutex_lock(&othercon->sock_mutex); 945988419a9Stsutomu.owa@toshiba.co.jp add_sock(newsock, othercon); 9466ed7257bSPatrick Caulfield addcon = othercon; 947c7355827Stsutomu.owa@toshiba.co.jp mutex_unlock(&othercon->sock_mutex); 9486ed7257bSPatrick Caulfield } 9496ed7257bSPatrick Caulfield else { 9503735b4b9SBob Peterson /* accept copies the sk after we've saved the callbacks, so we 9513735b4b9SBob Peterson don't want to save them a second time or comm errors will 9523735b4b9SBob Peterson result in calling sk_error_report recursively. */ 953988419a9Stsutomu.owa@toshiba.co.jp add_sock(newsock, newcon); 9546ed7257bSPatrick Caulfield addcon = newcon; 9556ed7257bSPatrick Caulfield } 9566ed7257bSPatrick Caulfield 957b30a624fSAlexander Aring set_bit(CF_CONNECTED, &addcon->flags); 9586ed7257bSPatrick Caulfield mutex_unlock(&newcon->sock_mutex); 9596ed7257bSPatrick Caulfield 9606ed7257bSPatrick Caulfield /* 9616ed7257bSPatrick Caulfield * Add it to the active queue in case we got data 96225985edcSLucas De Marchi * between processing the accept adding the socket 9636ed7257bSPatrick Caulfield * to the read_sockets list 9646ed7257bSPatrick Caulfield */ 9656ed7257bSPatrick Caulfield if (!test_and_set_bit(CF_READ_PENDING, &addcon->flags)) 9666ed7257bSPatrick Caulfield queue_work(recv_workqueue, &addcon->rwork); 9676ed7257bSPatrick Caulfield 9686ed7257bSPatrick Caulfield return 0; 9696ed7257bSPatrick Caulfield 9706ed7257bSPatrick Caulfield accept_err: 9713421fb15Stsutomu.owa@toshiba.co.jp if (newsock) 9726ed7257bSPatrick Caulfield sock_release(newsock); 9736ed7257bSPatrick Caulfield 9746ed7257bSPatrick Caulfield if (result != -EAGAIN) 975617e82e1SDavid Teigland log_print("error accepting connection from node: %d", result); 9766ed7257bSPatrick Caulfield return result; 9776ed7257bSPatrick Caulfield } 9786ed7257bSPatrick Caulfield 9796ed7257bSPatrick Caulfield static void free_entry(struct writequeue_entry *e) 9806ed7257bSPatrick Caulfield { 9816ed7257bSPatrick Caulfield __free_page(e->page); 9826ed7257bSPatrick Caulfield kfree(e); 9836ed7257bSPatrick Caulfield } 9846ed7257bSPatrick Caulfield 9855d689871SMike Christie /* 9865d689871SMike Christie * writequeue_entry_complete - try to delete and free write queue entry 9875d689871SMike Christie * @e: write queue entry to try to delete 9885d689871SMike Christie * @completed: bytes completed 9895d689871SMike Christie * 9905d689871SMike Christie * writequeue_lock must be held. 9915d689871SMike Christie */ 9925d689871SMike Christie static void writequeue_entry_complete(struct writequeue_entry *e, int completed) 9935d689871SMike Christie { 9945d689871SMike Christie e->offset += completed; 9955d689871SMike Christie e->len -= completed; 9965d689871SMike Christie 9975d689871SMike Christie if (e->len == 0 && e->users == 0) { 9985d689871SMike Christie list_del(&e->list); 9995d689871SMike Christie free_entry(e); 10005d689871SMike Christie } 10015d689871SMike Christie } 10025d689871SMike Christie 1003ee44b4bcSMarcelo Ricardo Leitner /* 1004ee44b4bcSMarcelo Ricardo Leitner * sctp_bind_addrs - bind a SCTP socket to all our addresses 1005ee44b4bcSMarcelo Ricardo Leitner */ 100613004e8aSAlexander Aring static int sctp_bind_addrs(struct socket *sock, uint16_t port) 1007ee44b4bcSMarcelo Ricardo Leitner { 1008ee44b4bcSMarcelo Ricardo Leitner struct sockaddr_storage localaddr; 1009c0425a42SChristoph Hellwig struct sockaddr *addr = (struct sockaddr *)&localaddr; 1010ee44b4bcSMarcelo Ricardo Leitner int i, addr_len, result = 0; 1011ee44b4bcSMarcelo Ricardo Leitner 1012ee44b4bcSMarcelo Ricardo Leitner for (i = 0; i < dlm_local_count; i++) { 1013ee44b4bcSMarcelo Ricardo Leitner memcpy(&localaddr, dlm_local_addr[i], sizeof(localaddr)); 1014ee44b4bcSMarcelo Ricardo Leitner make_sockaddr(&localaddr, port, &addr_len); 1015ee44b4bcSMarcelo Ricardo Leitner 1016ee44b4bcSMarcelo Ricardo Leitner if (!i) 101713004e8aSAlexander Aring result = kernel_bind(sock, addr, addr_len); 1018ee44b4bcSMarcelo Ricardo Leitner else 101913004e8aSAlexander Aring result = sock_bind_add(sock->sk, addr, addr_len); 1020ee44b4bcSMarcelo Ricardo Leitner 1021ee44b4bcSMarcelo Ricardo Leitner if (result < 0) { 1022ee44b4bcSMarcelo Ricardo Leitner log_print("Can't bind to %d addr number %d, %d.\n", 1023ee44b4bcSMarcelo Ricardo Leitner port, i + 1, result); 1024ee44b4bcSMarcelo Ricardo Leitner break; 1025ee44b4bcSMarcelo Ricardo Leitner } 1026ee44b4bcSMarcelo Ricardo Leitner } 1027ee44b4bcSMarcelo Ricardo Leitner return result; 1028ee44b4bcSMarcelo Ricardo Leitner } 1029ee44b4bcSMarcelo Ricardo Leitner 10306ed7257bSPatrick Caulfield /* Initiate an SCTP association. 10316ed7257bSPatrick Caulfield This is a special case of send_to_sock() in that we don't yet have a 10326ed7257bSPatrick Caulfield peeled-off socket for this association, so we use the listening socket 10336ed7257bSPatrick Caulfield and add the primary IP address of the remote node. 10346ed7257bSPatrick Caulfield */ 1035ee44b4bcSMarcelo Ricardo Leitner static void sctp_connect_to_sock(struct connection *con) 10366ed7257bSPatrick Caulfield { 1037ee44b4bcSMarcelo Ricardo Leitner struct sockaddr_storage daddr; 1038ee44b4bcSMarcelo Ricardo Leitner int result; 1039ee44b4bcSMarcelo Ricardo Leitner int addr_len; 1040ee44b4bcSMarcelo Ricardo Leitner struct socket *sock; 10419c9f168fSAlexander Aring unsigned int mark; 1042ee44b4bcSMarcelo Ricardo Leitner 10435d689871SMike Christie mutex_lock(&con->sock_mutex); 10446ed7257bSPatrick Caulfield 1045ee44b4bcSMarcelo Ricardo Leitner /* Some odd races can cause double-connects, ignore them */ 1046ee44b4bcSMarcelo Ricardo Leitner if (con->retries++ > MAX_CONNECT_RETRIES) 1047ee44b4bcSMarcelo Ricardo Leitner goto out; 1048ee44b4bcSMarcelo Ricardo Leitner 1049ee44b4bcSMarcelo Ricardo Leitner if (con->sock) { 1050ee44b4bcSMarcelo Ricardo Leitner log_print("node %d already connected.", con->nodeid); 1051ee44b4bcSMarcelo Ricardo Leitner goto out; 1052ee44b4bcSMarcelo Ricardo Leitner } 1053ee44b4bcSMarcelo Ricardo Leitner 1054ee44b4bcSMarcelo Ricardo Leitner memset(&daddr, 0, sizeof(daddr)); 1055e125fbebSAlexander Aring result = nodeid_to_addr(con->nodeid, &daddr, NULL, true, &mark); 1056ee44b4bcSMarcelo Ricardo Leitner if (result < 0) { 10576ed7257bSPatrick Caulfield log_print("no address for nodeid %d", con->nodeid); 1058ee44b4bcSMarcelo Ricardo Leitner goto out; 105904bedd79SDavid Teigland } 10606ed7257bSPatrick Caulfield 1061ee44b4bcSMarcelo Ricardo Leitner /* Create a socket to communicate with */ 1062ee44b4bcSMarcelo Ricardo Leitner result = sock_create_kern(&init_net, dlm_local_addr[0]->ss_family, 1063ee44b4bcSMarcelo Ricardo Leitner SOCK_STREAM, IPPROTO_SCTP, &sock); 1064ee44b4bcSMarcelo Ricardo Leitner if (result < 0) 1065ee44b4bcSMarcelo Ricardo Leitner goto socket_err; 10666ed7257bSPatrick Caulfield 10679c9f168fSAlexander Aring sock_set_mark(sock->sk, mark); 10689c9f168fSAlexander Aring 1069988419a9Stsutomu.owa@toshiba.co.jp add_sock(sock, con); 10706ed7257bSPatrick Caulfield 1071ee44b4bcSMarcelo Ricardo Leitner /* Bind to all addresses. */ 107213004e8aSAlexander Aring if (sctp_bind_addrs(con->sock, 0)) 1073ee44b4bcSMarcelo Ricardo Leitner goto bind_err; 107498e1b60eSMike Christie 1075ee44b4bcSMarcelo Ricardo Leitner make_sockaddr(&daddr, dlm_config.ci_tcp_port, &addr_len); 10766ed7257bSPatrick Caulfield 1077ee44b4bcSMarcelo Ricardo Leitner log_print("connecting to %d", con->nodeid); 10786ed7257bSPatrick Caulfield 1079ee44b4bcSMarcelo Ricardo Leitner /* Turn off Nagle's algorithm */ 108040ef92c6SChristoph Hellwig sctp_sock_set_nodelay(sock->sk); 1081ee44b4bcSMarcelo Ricardo Leitner 1082f706d830SGang He /* 1083f706d830SGang He * Make sock->ops->connect() function return in specified time, 1084f706d830SGang He * since O_NONBLOCK argument in connect() function does not work here, 1085f706d830SGang He * then, we should restore the default value of this attribute. 1086f706d830SGang He */ 108776ee0785SChristoph Hellwig sock_set_sndtimeo(sock->sk, 5); 1088ee44b4bcSMarcelo Ricardo Leitner result = sock->ops->connect(sock, (struct sockaddr *)&daddr, addr_len, 1089da3627c3SGang He 0); 109076ee0785SChristoph Hellwig sock_set_sndtimeo(sock->sk, 0); 1091f706d830SGang He 1092ee44b4bcSMarcelo Ricardo Leitner if (result == -EINPROGRESS) 1093ee44b4bcSMarcelo Ricardo Leitner result = 0; 109419633c7eSAlexander Aring if (result == 0) { 109519633c7eSAlexander Aring if (!test_and_set_bit(CF_CONNECTED, &con->flags)) 109619633c7eSAlexander Aring log_print("successful connected to node %d", con->nodeid); 1097ee44b4bcSMarcelo Ricardo Leitner goto out; 109819633c7eSAlexander Aring } 1099ee44b4bcSMarcelo Ricardo Leitner 1100ee44b4bcSMarcelo Ricardo Leitner bind_err: 1101ee44b4bcSMarcelo Ricardo Leitner con->sock = NULL; 1102ee44b4bcSMarcelo Ricardo Leitner sock_release(sock); 1103ee44b4bcSMarcelo Ricardo Leitner 1104ee44b4bcSMarcelo Ricardo Leitner socket_err: 1105ee44b4bcSMarcelo Ricardo Leitner /* 1106ee44b4bcSMarcelo Ricardo Leitner * Some errors are fatal and this list might need adjusting. For other 1107ee44b4bcSMarcelo Ricardo Leitner * errors we try again until the max number of retries is reached. 1108ee44b4bcSMarcelo Ricardo Leitner */ 1109ee44b4bcSMarcelo Ricardo Leitner if (result != -EHOSTUNREACH && 1110ee44b4bcSMarcelo Ricardo Leitner result != -ENETUNREACH && 1111ee44b4bcSMarcelo Ricardo Leitner result != -ENETDOWN && 1112ee44b4bcSMarcelo Ricardo Leitner result != -EINVAL && 1113ee44b4bcSMarcelo Ricardo Leitner result != -EPROTONOSUPPORT) { 1114ee44b4bcSMarcelo Ricardo Leitner log_print("connect %d try %d error %d", con->nodeid, 1115ee44b4bcSMarcelo Ricardo Leitner con->retries, result); 1116ee44b4bcSMarcelo Ricardo Leitner mutex_unlock(&con->sock_mutex); 1117ee44b4bcSMarcelo Ricardo Leitner msleep(1000); 1118ee44b4bcSMarcelo Ricardo Leitner lowcomms_connect_sock(con); 1119ee44b4bcSMarcelo Ricardo Leitner return; 11206ed7257bSPatrick Caulfield } 11215d689871SMike Christie 1122ee44b4bcSMarcelo Ricardo Leitner out: 11235d689871SMike Christie mutex_unlock(&con->sock_mutex); 11246ed7257bSPatrick Caulfield } 11256ed7257bSPatrick Caulfield 11266ed7257bSPatrick Caulfield /* Connect a new socket to its peer */ 11276ed7257bSPatrick Caulfield static void tcp_connect_to_sock(struct connection *con) 11286ed7257bSPatrick Caulfield { 11296bd8fedaSLon Hohberger struct sockaddr_storage saddr, src_addr; 1130e125fbebSAlexander Aring unsigned int mark; 11316ed7257bSPatrick Caulfield int addr_len; 1132a89d63a1SCasey Dahlin struct socket *sock = NULL; 113336b71a8bSDavid Teigland int result; 11346ed7257bSPatrick Caulfield 11356ed7257bSPatrick Caulfield mutex_lock(&con->sock_mutex); 11366ed7257bSPatrick Caulfield if (con->retries++ > MAX_CONNECT_RETRIES) 11376ed7257bSPatrick Caulfield goto out; 11386ed7257bSPatrick Caulfield 11396ed7257bSPatrick Caulfield /* Some odd races can cause double-connects, ignore them */ 114036b71a8bSDavid Teigland if (con->sock) 11416ed7257bSPatrick Caulfield goto out; 11426ed7257bSPatrick Caulfield 11436ed7257bSPatrick Caulfield /* Create a socket to communicate with */ 1144eeb1bd5cSEric W. Biederman result = sock_create_kern(&init_net, dlm_local_addr[0]->ss_family, 1145eeb1bd5cSEric W. Biederman SOCK_STREAM, IPPROTO_TCP, &sock); 11466ed7257bSPatrick Caulfield if (result < 0) 11476ed7257bSPatrick Caulfield goto out_err; 11486ed7257bSPatrick Caulfield 11496ed7257bSPatrick Caulfield memset(&saddr, 0, sizeof(saddr)); 1150e125fbebSAlexander Aring result = nodeid_to_addr(con->nodeid, &saddr, NULL, false, &mark); 115136b71a8bSDavid Teigland if (result < 0) { 115236b71a8bSDavid Teigland log_print("no address for nodeid %d", con->nodeid); 11536ed7257bSPatrick Caulfield goto out_err; 115436b71a8bSDavid Teigland } 11556ed7257bSPatrick Caulfield 1156e125fbebSAlexander Aring sock_set_mark(sock->sk, mark); 1157e125fbebSAlexander Aring 1158988419a9Stsutomu.owa@toshiba.co.jp add_sock(sock, con); 11596ed7257bSPatrick Caulfield 11606bd8fedaSLon Hohberger /* Bind to our cluster-known address connecting to avoid 11616bd8fedaSLon Hohberger routing problems */ 11626bd8fedaSLon Hohberger memcpy(&src_addr, dlm_local_addr[0], sizeof(src_addr)); 11636bd8fedaSLon Hohberger make_sockaddr(&src_addr, 0, &addr_len); 11646bd8fedaSLon Hohberger result = sock->ops->bind(sock, (struct sockaddr *) &src_addr, 11656bd8fedaSLon Hohberger addr_len); 11666bd8fedaSLon Hohberger if (result < 0) { 11676bd8fedaSLon Hohberger log_print("could not bind for connect: %d", result); 11686bd8fedaSLon Hohberger /* This *may* not indicate a critical error */ 11696bd8fedaSLon Hohberger } 11706bd8fedaSLon Hohberger 11716ed7257bSPatrick Caulfield make_sockaddr(&saddr, dlm_config.ci_tcp_port, &addr_len); 11726ed7257bSPatrick Caulfield 11736ed7257bSPatrick Caulfield log_print("connecting to %d", con->nodeid); 1174cb2d45daSDavid Teigland 1175cb2d45daSDavid Teigland /* Turn off Nagle's algorithm */ 117612abc5eeSChristoph Hellwig tcp_sock_set_nodelay(sock->sk); 1177cb2d45daSDavid Teigland 117836b71a8bSDavid Teigland result = sock->ops->connect(sock, (struct sockaddr *)&saddr, addr_len, 11796ed7257bSPatrick Caulfield O_NONBLOCK); 11806ed7257bSPatrick Caulfield if (result == -EINPROGRESS) 11816ed7257bSPatrick Caulfield result = 0; 11826ed7257bSPatrick Caulfield if (result == 0) 11836ed7257bSPatrick Caulfield goto out; 11846ed7257bSPatrick Caulfield 11856ed7257bSPatrick Caulfield out_err: 11866ed7257bSPatrick Caulfield if (con->sock) { 11876ed7257bSPatrick Caulfield sock_release(con->sock); 11886ed7257bSPatrick Caulfield con->sock = NULL; 1189a89d63a1SCasey Dahlin } else if (sock) { 1190a89d63a1SCasey Dahlin sock_release(sock); 11916ed7257bSPatrick Caulfield } 11926ed7257bSPatrick Caulfield /* 11936ed7257bSPatrick Caulfield * Some errors are fatal and this list might need adjusting. For other 11946ed7257bSPatrick Caulfield * errors we try again until the max number of retries is reached. 11956ed7257bSPatrick Caulfield */ 119636b71a8bSDavid Teigland if (result != -EHOSTUNREACH && 119736b71a8bSDavid Teigland result != -ENETUNREACH && 119836b71a8bSDavid Teigland result != -ENETDOWN && 119936b71a8bSDavid Teigland result != -EINVAL && 120036b71a8bSDavid Teigland result != -EPROTONOSUPPORT) { 120136b71a8bSDavid Teigland log_print("connect %d try %d error %d", con->nodeid, 120236b71a8bSDavid Teigland con->retries, result); 120336b71a8bSDavid Teigland mutex_unlock(&con->sock_mutex); 120436b71a8bSDavid Teigland msleep(1000); 12056ed7257bSPatrick Caulfield lowcomms_connect_sock(con); 120636b71a8bSDavid Teigland return; 12076ed7257bSPatrick Caulfield } 12086ed7257bSPatrick Caulfield out: 12096ed7257bSPatrick Caulfield mutex_unlock(&con->sock_mutex); 12106ed7257bSPatrick Caulfield return; 12116ed7257bSPatrick Caulfield } 12126ed7257bSPatrick Caulfield 1213d11ccd45SAlexander Aring /* On error caller must run dlm_close_sock() for the 1214d11ccd45SAlexander Aring * listen connection socket. 1215d11ccd45SAlexander Aring */ 1216d11ccd45SAlexander Aring static int tcp_create_listen_sock(struct listen_connection *con, 12176ed7257bSPatrick Caulfield struct sockaddr_storage *saddr) 12186ed7257bSPatrick Caulfield { 12196ed7257bSPatrick Caulfield struct socket *sock = NULL; 12206ed7257bSPatrick Caulfield int result = 0; 12216ed7257bSPatrick Caulfield int addr_len; 12226ed7257bSPatrick Caulfield 12236ed7257bSPatrick Caulfield if (dlm_local_addr[0]->ss_family == AF_INET) 12246ed7257bSPatrick Caulfield addr_len = sizeof(struct sockaddr_in); 12256ed7257bSPatrick Caulfield else 12266ed7257bSPatrick Caulfield addr_len = sizeof(struct sockaddr_in6); 12276ed7257bSPatrick Caulfield 12286ed7257bSPatrick Caulfield /* Create a socket to communicate with */ 1229eeb1bd5cSEric W. Biederman result = sock_create_kern(&init_net, dlm_local_addr[0]->ss_family, 1230eeb1bd5cSEric W. Biederman SOCK_STREAM, IPPROTO_TCP, &sock); 12316ed7257bSPatrick Caulfield if (result < 0) { 1232617e82e1SDavid Teigland log_print("Can't create listening comms socket"); 12336ed7257bSPatrick Caulfield goto create_out; 12346ed7257bSPatrick Caulfield } 12356ed7257bSPatrick Caulfield 1236a5b7ab63SAlexander Aring sock_set_mark(sock->sk, dlm_config.ci_mark); 1237a5b7ab63SAlexander Aring 1238cb2d45daSDavid Teigland /* Turn off Nagle's algorithm */ 123912abc5eeSChristoph Hellwig tcp_sock_set_nodelay(sock->sk); 1240cb2d45daSDavid Teigland 1241b58f0e8fSChristoph Hellwig sock_set_reuseaddr(sock->sk); 12426ed7257bSPatrick Caulfield 1243d11ccd45SAlexander Aring add_listen_sock(sock, con); 12446ed7257bSPatrick Caulfield 12456ed7257bSPatrick Caulfield /* Bind to our port */ 12466ed7257bSPatrick Caulfield make_sockaddr(saddr, dlm_config.ci_tcp_port, &addr_len); 12476ed7257bSPatrick Caulfield result = sock->ops->bind(sock, (struct sockaddr *) saddr, addr_len); 12486ed7257bSPatrick Caulfield if (result < 0) { 1249617e82e1SDavid Teigland log_print("Can't bind to port %d", dlm_config.ci_tcp_port); 12506ed7257bSPatrick Caulfield goto create_out; 12516ed7257bSPatrick Caulfield } 1252ce3d9544SChristoph Hellwig sock_set_keepalive(sock->sk); 12536ed7257bSPatrick Caulfield 12546ed7257bSPatrick Caulfield result = sock->ops->listen(sock, 5); 12556ed7257bSPatrick Caulfield if (result < 0) { 1256617e82e1SDavid Teigland log_print("Can't listen on port %d", dlm_config.ci_tcp_port); 12576ed7257bSPatrick Caulfield goto create_out; 12586ed7257bSPatrick Caulfield } 12596ed7257bSPatrick Caulfield 1260d11ccd45SAlexander Aring return 0; 1261d11ccd45SAlexander Aring 12626ed7257bSPatrick Caulfield create_out: 1263d11ccd45SAlexander Aring return result; 12646ed7257bSPatrick Caulfield } 12656ed7257bSPatrick Caulfield 12666ed7257bSPatrick Caulfield /* Get local addresses */ 12676ed7257bSPatrick Caulfield static void init_local(void) 12686ed7257bSPatrick Caulfield { 12696ed7257bSPatrick Caulfield struct sockaddr_storage sas, *addr; 12706ed7257bSPatrick Caulfield int i; 12716ed7257bSPatrick Caulfield 127230d3a237SPatrick Caulfield dlm_local_count = 0; 12731b189b88SDavid Teigland for (i = 0; i < DLM_MAX_ADDR_COUNT; i++) { 12746ed7257bSPatrick Caulfield if (dlm_our_addr(&sas, i)) 12756ed7257bSPatrick Caulfield break; 12766ed7257bSPatrick Caulfield 12775c93f56fSAmitoj Kaur Chawla addr = kmemdup(&sas, sizeof(*addr), GFP_NOFS); 12786ed7257bSPatrick Caulfield if (!addr) 12796ed7257bSPatrick Caulfield break; 12806ed7257bSPatrick Caulfield dlm_local_addr[dlm_local_count++] = addr; 12816ed7257bSPatrick Caulfield } 12826ed7257bSPatrick Caulfield } 12836ed7257bSPatrick Caulfield 1284043697f0SAlexander Aring static void deinit_local(void) 1285043697f0SAlexander Aring { 1286043697f0SAlexander Aring int i; 1287043697f0SAlexander Aring 1288043697f0SAlexander Aring for (i = 0; i < dlm_local_count; i++) 1289043697f0SAlexander Aring kfree(dlm_local_addr[i]); 1290043697f0SAlexander Aring } 1291043697f0SAlexander Aring 1292d11ccd45SAlexander Aring /* Initialise SCTP socket and bind to all interfaces 1293d11ccd45SAlexander Aring * On error caller must run dlm_close_sock() for the 1294d11ccd45SAlexander Aring * listen connection socket. 1295d11ccd45SAlexander Aring */ 1296d11ccd45SAlexander Aring static int sctp_listen_for_all(struct listen_connection *con) 12976ed7257bSPatrick Caulfield { 12986ed7257bSPatrick Caulfield struct socket *sock = NULL; 1299ee44b4bcSMarcelo Ricardo Leitner int result = -EINVAL; 13006ed7257bSPatrick Caulfield 13016ed7257bSPatrick Caulfield log_print("Using SCTP for communications"); 13026ed7257bSPatrick Caulfield 1303eeb1bd5cSEric W. Biederman result = sock_create_kern(&init_net, dlm_local_addr[0]->ss_family, 1304ee44b4bcSMarcelo Ricardo Leitner SOCK_STREAM, IPPROTO_SCTP, &sock); 13056ed7257bSPatrick Caulfield if (result < 0) { 13066ed7257bSPatrick Caulfield log_print("Can't create comms socket, check SCTP is loaded"); 13076ed7257bSPatrick Caulfield goto out; 13086ed7257bSPatrick Caulfield } 13096ed7257bSPatrick Caulfield 131026cfabf9SChristoph Hellwig sock_set_rcvbuf(sock->sk, NEEDED_RMEM); 1311a5b7ab63SAlexander Aring sock_set_mark(sock->sk, dlm_config.ci_mark); 131240ef92c6SChristoph Hellwig sctp_sock_set_nodelay(sock->sk); 131386e92ad2SMike Christie 1314d11ccd45SAlexander Aring add_listen_sock(sock, con); 1315b81171cbSBob Peterson 1316ee44b4bcSMarcelo Ricardo Leitner /* Bind to all addresses. */ 1317d11ccd45SAlexander Aring result = sctp_bind_addrs(con->sock, dlm_config.ci_tcp_port); 1318d11ccd45SAlexander Aring if (result < 0) 1319d11ccd45SAlexander Aring goto out; 13206ed7257bSPatrick Caulfield 13216ed7257bSPatrick Caulfield result = sock->ops->listen(sock, 5); 13226ed7257bSPatrick Caulfield if (result < 0) { 13236ed7257bSPatrick Caulfield log_print("Can't set socket listening"); 1324d11ccd45SAlexander Aring goto out; 13256ed7257bSPatrick Caulfield } 13266ed7257bSPatrick Caulfield 13276ed7257bSPatrick Caulfield return 0; 13286ed7257bSPatrick Caulfield 13296ed7257bSPatrick Caulfield out: 13306ed7257bSPatrick Caulfield return result; 13316ed7257bSPatrick Caulfield } 13326ed7257bSPatrick Caulfield 13336ed7257bSPatrick Caulfield static int tcp_listen_for_all(void) 13346ed7257bSPatrick Caulfield { 13356ed7257bSPatrick Caulfield /* We don't support multi-homed hosts */ 13361a26bfafSAlexander Aring if (dlm_local_count > 1) { 1337617e82e1SDavid Teigland log_print("TCP protocol can't handle multi-homed hosts, " 1338617e82e1SDavid Teigland "try SCTP"); 13396ed7257bSPatrick Caulfield return -EINVAL; 13406ed7257bSPatrick Caulfield } 13416ed7257bSPatrick Caulfield 13426ed7257bSPatrick Caulfield log_print("Using TCP for communications"); 13436ed7257bSPatrick Caulfield 1344d11ccd45SAlexander Aring return tcp_create_listen_sock(&listen_con, dlm_local_addr[0]); 13456ed7257bSPatrick Caulfield } 13466ed7257bSPatrick Caulfield 13476ed7257bSPatrick Caulfield 13486ed7257bSPatrick Caulfield 13496ed7257bSPatrick Caulfield static struct writequeue_entry *new_writequeue_entry(struct connection *con, 13506ed7257bSPatrick Caulfield gfp_t allocation) 13516ed7257bSPatrick Caulfield { 13526ed7257bSPatrick Caulfield struct writequeue_entry *entry; 13536ed7257bSPatrick Caulfield 13546ed7257bSPatrick Caulfield entry = kmalloc(sizeof(struct writequeue_entry), allocation); 13556ed7257bSPatrick Caulfield if (!entry) 13566ed7257bSPatrick Caulfield return NULL; 13576ed7257bSPatrick Caulfield 13586ed7257bSPatrick Caulfield entry->page = alloc_page(allocation); 13596ed7257bSPatrick Caulfield if (!entry->page) { 13606ed7257bSPatrick Caulfield kfree(entry); 13616ed7257bSPatrick Caulfield return NULL; 13626ed7257bSPatrick Caulfield } 13636ed7257bSPatrick Caulfield 13646ed7257bSPatrick Caulfield entry->offset = 0; 13656ed7257bSPatrick Caulfield entry->len = 0; 13666ed7257bSPatrick Caulfield entry->end = 0; 13676ed7257bSPatrick Caulfield entry->users = 0; 13686ed7257bSPatrick Caulfield entry->con = con; 13696ed7257bSPatrick Caulfield 13706ed7257bSPatrick Caulfield return entry; 13716ed7257bSPatrick Caulfield } 13726ed7257bSPatrick Caulfield 1373617e82e1SDavid Teigland void *dlm_lowcomms_get_buffer(int nodeid, int len, gfp_t allocation, char **ppc) 13746ed7257bSPatrick Caulfield { 13756ed7257bSPatrick Caulfield struct connection *con; 13766ed7257bSPatrick Caulfield struct writequeue_entry *e; 13776ed7257bSPatrick Caulfield int offset = 0; 13786ed7257bSPatrick Caulfield 1379692f51c8SAlexander Aring if (len > LOWCOMMS_MAX_TX_BUFFER_LEN) { 1380692f51c8SAlexander Aring BUILD_BUG_ON(PAGE_SIZE < LOWCOMMS_MAX_TX_BUFFER_LEN); 1381692f51c8SAlexander Aring log_print("failed to allocate a buffer of size %d", len); 1382692f51c8SAlexander Aring return NULL; 1383692f51c8SAlexander Aring } 1384692f51c8SAlexander Aring 13856ed7257bSPatrick Caulfield con = nodeid2con(nodeid, allocation); 13866ed7257bSPatrick Caulfield if (!con) 13876ed7257bSPatrick Caulfield return NULL; 13886ed7257bSPatrick Caulfield 13896ed7257bSPatrick Caulfield spin_lock(&con->writequeue_lock); 13906ed7257bSPatrick Caulfield e = list_entry(con->writequeue.prev, struct writequeue_entry, list); 13916ed7257bSPatrick Caulfield if ((&e->list == &con->writequeue) || 139209cbfeafSKirill A. Shutemov (PAGE_SIZE - e->end < len)) { 13936ed7257bSPatrick Caulfield e = NULL; 13946ed7257bSPatrick Caulfield } else { 13956ed7257bSPatrick Caulfield offset = e->end; 13966ed7257bSPatrick Caulfield e->end += len; 1397eeee2b5fSWei Yongjun e->users++; 13986ed7257bSPatrick Caulfield } 13996ed7257bSPatrick Caulfield spin_unlock(&con->writequeue_lock); 14006ed7257bSPatrick Caulfield 14016ed7257bSPatrick Caulfield if (e) { 14026ed7257bSPatrick Caulfield got_one: 14036ed7257bSPatrick Caulfield *ppc = page_address(e->page) + offset; 14046ed7257bSPatrick Caulfield return e; 14056ed7257bSPatrick Caulfield } 14066ed7257bSPatrick Caulfield 14076ed7257bSPatrick Caulfield e = new_writequeue_entry(con, allocation); 14086ed7257bSPatrick Caulfield if (e) { 14096ed7257bSPatrick Caulfield spin_lock(&con->writequeue_lock); 14106ed7257bSPatrick Caulfield offset = e->end; 14116ed7257bSPatrick Caulfield e->end += len; 1412eeee2b5fSWei Yongjun e->users++; 14136ed7257bSPatrick Caulfield list_add_tail(&e->list, &con->writequeue); 14146ed7257bSPatrick Caulfield spin_unlock(&con->writequeue_lock); 14156ed7257bSPatrick Caulfield goto got_one; 14166ed7257bSPatrick Caulfield } 14176ed7257bSPatrick Caulfield return NULL; 14186ed7257bSPatrick Caulfield } 14196ed7257bSPatrick Caulfield 14206ed7257bSPatrick Caulfield void dlm_lowcomms_commit_buffer(void *mh) 14216ed7257bSPatrick Caulfield { 14226ed7257bSPatrick Caulfield struct writequeue_entry *e = (struct writequeue_entry *)mh; 14236ed7257bSPatrick Caulfield struct connection *con = e->con; 14246ed7257bSPatrick Caulfield int users; 14256ed7257bSPatrick Caulfield 14266ed7257bSPatrick Caulfield spin_lock(&con->writequeue_lock); 14276ed7257bSPatrick Caulfield users = --e->users; 14286ed7257bSPatrick Caulfield if (users) 14296ed7257bSPatrick Caulfield goto out; 14306ed7257bSPatrick Caulfield e->len = e->end - e->offset; 14316ed7257bSPatrick Caulfield spin_unlock(&con->writequeue_lock); 14326ed7257bSPatrick Caulfield 14336ed7257bSPatrick Caulfield queue_work(send_workqueue, &con->swork); 14346ed7257bSPatrick Caulfield return; 14356ed7257bSPatrick Caulfield 14366ed7257bSPatrick Caulfield out: 14376ed7257bSPatrick Caulfield spin_unlock(&con->writequeue_lock); 14386ed7257bSPatrick Caulfield return; 14396ed7257bSPatrick Caulfield } 14406ed7257bSPatrick Caulfield 14416ed7257bSPatrick Caulfield /* Send a message */ 14426ed7257bSPatrick Caulfield static void send_to_sock(struct connection *con) 14436ed7257bSPatrick Caulfield { 14446ed7257bSPatrick Caulfield int ret = 0; 14456ed7257bSPatrick Caulfield const int msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL; 14466ed7257bSPatrick Caulfield struct writequeue_entry *e; 14476ed7257bSPatrick Caulfield int len, offset; 1448f92c8dd7SBob Peterson int count = 0; 14496ed7257bSPatrick Caulfield 14506ed7257bSPatrick Caulfield mutex_lock(&con->sock_mutex); 14516ed7257bSPatrick Caulfield if (con->sock == NULL) 14526ed7257bSPatrick Caulfield goto out_connect; 14536ed7257bSPatrick Caulfield 14546ed7257bSPatrick Caulfield spin_lock(&con->writequeue_lock); 14556ed7257bSPatrick Caulfield for (;;) { 14566ed7257bSPatrick Caulfield e = list_entry(con->writequeue.next, struct writequeue_entry, 14576ed7257bSPatrick Caulfield list); 14586ed7257bSPatrick Caulfield if ((struct list_head *) e == &con->writequeue) 14596ed7257bSPatrick Caulfield break; 14606ed7257bSPatrick Caulfield 14616ed7257bSPatrick Caulfield len = e->len; 14626ed7257bSPatrick Caulfield offset = e->offset; 14636ed7257bSPatrick Caulfield BUG_ON(len == 0 && e->users == 0); 14646ed7257bSPatrick Caulfield spin_unlock(&con->writequeue_lock); 14656ed7257bSPatrick Caulfield 14666ed7257bSPatrick Caulfield ret = 0; 14676ed7257bSPatrick Caulfield if (len) { 14681329e3f2SPaolo Bonzini ret = kernel_sendpage(con->sock, e->page, offset, len, 14696ed7257bSPatrick Caulfield msg_flags); 1470d66f8277SPatrick Caulfield if (ret == -EAGAIN || ret == 0) { 1471b36930ddSDavid Miller if (ret == -EAGAIN && 14729cd3e072SEric Dumazet test_bit(SOCKWQ_ASYNC_NOSPACE, &con->sock->flags) && 1473b36930ddSDavid Miller !test_and_set_bit(CF_APP_LIMITED, &con->flags)) { 1474b36930ddSDavid Miller /* Notify TCP that we're limited by the 1475b36930ddSDavid Miller * application window size. 1476b36930ddSDavid Miller */ 1477b36930ddSDavid Miller set_bit(SOCK_NOSPACE, &con->sock->flags); 1478b36930ddSDavid Miller con->sock->sk->sk_write_pending++; 1479b36930ddSDavid Miller } 1480d66f8277SPatrick Caulfield cond_resched(); 14816ed7257bSPatrick Caulfield goto out; 14829c5bef58SYing Xue } else if (ret < 0) 14836ed7257bSPatrick Caulfield goto send_error; 1484d66f8277SPatrick Caulfield } 1485f92c8dd7SBob Peterson 14866ed7257bSPatrick Caulfield /* Don't starve people filling buffers */ 1487f92c8dd7SBob Peterson if (++count >= MAX_SEND_MSG_COUNT) { 14886ed7257bSPatrick Caulfield cond_resched(); 1489f92c8dd7SBob Peterson count = 0; 1490f92c8dd7SBob Peterson } 14916ed7257bSPatrick Caulfield 14926ed7257bSPatrick Caulfield spin_lock(&con->writequeue_lock); 14935d689871SMike Christie writequeue_entry_complete(e, ret); 14946ed7257bSPatrick Caulfield } 14956ed7257bSPatrick Caulfield spin_unlock(&con->writequeue_lock); 14966ed7257bSPatrick Caulfield out: 14976ed7257bSPatrick Caulfield mutex_unlock(&con->sock_mutex); 14986ed7257bSPatrick Caulfield return; 14996ed7257bSPatrick Caulfield 15006ed7257bSPatrick Caulfield send_error: 15016ed7257bSPatrick Caulfield mutex_unlock(&con->sock_mutex); 1502ba3ab3caSAlexander Aring close_connection(con, false, false, true); 150301da24d3SBob Peterson /* Requeue the send work. When the work daemon runs again, it will try 150401da24d3SBob Peterson a new connection, then call this function again. */ 150501da24d3SBob Peterson queue_work(send_workqueue, &con->swork); 15066ed7257bSPatrick Caulfield return; 15076ed7257bSPatrick Caulfield 15086ed7257bSPatrick Caulfield out_connect: 15096ed7257bSPatrick Caulfield mutex_unlock(&con->sock_mutex); 151001da24d3SBob Peterson queue_work(send_workqueue, &con->swork); 151101da24d3SBob Peterson cond_resched(); 15126ed7257bSPatrick Caulfield } 15136ed7257bSPatrick Caulfield 15146ed7257bSPatrick Caulfield static void clean_one_writequeue(struct connection *con) 15156ed7257bSPatrick Caulfield { 15165e9ccc37SChristine Caulfield struct writequeue_entry *e, *safe; 15176ed7257bSPatrick Caulfield 15186ed7257bSPatrick Caulfield spin_lock(&con->writequeue_lock); 15195e9ccc37SChristine Caulfield list_for_each_entry_safe(e, safe, &con->writequeue, list) { 15206ed7257bSPatrick Caulfield list_del(&e->list); 15216ed7257bSPatrick Caulfield free_entry(e); 15226ed7257bSPatrick Caulfield } 15236ed7257bSPatrick Caulfield spin_unlock(&con->writequeue_lock); 15246ed7257bSPatrick Caulfield } 15256ed7257bSPatrick Caulfield 15266ed7257bSPatrick Caulfield /* Called from recovery when it knows that a node has 15276ed7257bSPatrick Caulfield left the cluster */ 15286ed7257bSPatrick Caulfield int dlm_lowcomms_close(int nodeid) 15296ed7257bSPatrick Caulfield { 15306ed7257bSPatrick Caulfield struct connection *con; 153136b71a8bSDavid Teigland struct dlm_node_addr *na; 15326ed7257bSPatrick Caulfield 15336ed7257bSPatrick Caulfield log_print("closing connection to node %d", nodeid); 15346ed7257bSPatrick Caulfield con = nodeid2con(nodeid, 0); 15356ed7257bSPatrick Caulfield if (con) { 1536063c4c99SLars Marowsky-Bree set_bit(CF_CLOSE, &con->flags); 15370d737a8cSMarcelo Ricardo Leitner close_connection(con, true, true, true); 15386ed7257bSPatrick Caulfield clean_one_writequeue(con); 153953a5edaaSAlexander Aring if (con->othercon) 154053a5edaaSAlexander Aring clean_one_writequeue(con->othercon); 15416ed7257bSPatrick Caulfield } 154236b71a8bSDavid Teigland 154336b71a8bSDavid Teigland spin_lock(&dlm_node_addrs_spin); 154436b71a8bSDavid Teigland na = find_node_addr(nodeid); 154536b71a8bSDavid Teigland if (na) { 154636b71a8bSDavid Teigland list_del(&na->list); 154736b71a8bSDavid Teigland while (na->addr_count--) 154836b71a8bSDavid Teigland kfree(na->addr[na->addr_count]); 154936b71a8bSDavid Teigland kfree(na); 155036b71a8bSDavid Teigland } 155136b71a8bSDavid Teigland spin_unlock(&dlm_node_addrs_spin); 155236b71a8bSDavid Teigland 15536ed7257bSPatrick Caulfield return 0; 15546ed7257bSPatrick Caulfield } 15556ed7257bSPatrick Caulfield 15566ed7257bSPatrick Caulfield /* Receive workqueue function */ 15576ed7257bSPatrick Caulfield static void process_recv_sockets(struct work_struct *work) 15586ed7257bSPatrick Caulfield { 15596ed7257bSPatrick Caulfield struct connection *con = container_of(work, struct connection, rwork); 15606ed7257bSPatrick Caulfield int err; 15616ed7257bSPatrick Caulfield 15626ed7257bSPatrick Caulfield clear_bit(CF_READ_PENDING, &con->flags); 15636ed7257bSPatrick Caulfield do { 1564d11ccd45SAlexander Aring err = receive_from_sock(con); 15656ed7257bSPatrick Caulfield } while (!err); 15666ed7257bSPatrick Caulfield } 15676ed7257bSPatrick Caulfield 1568d11ccd45SAlexander Aring static void process_listen_recv_socket(struct work_struct *work) 1569d11ccd45SAlexander Aring { 1570d11ccd45SAlexander Aring accept_from_sock(&listen_con); 1571d11ccd45SAlexander Aring } 1572d11ccd45SAlexander Aring 15736ed7257bSPatrick Caulfield /* Send workqueue function */ 15746ed7257bSPatrick Caulfield static void process_send_sockets(struct work_struct *work) 15756ed7257bSPatrick Caulfield { 15766ed7257bSPatrick Caulfield struct connection *con = container_of(work, struct connection, swork); 15776ed7257bSPatrick Caulfield 15788a4abb08Stsutomu.owa@toshiba.co.jp clear_bit(CF_WRITE_PENDING, &con->flags); 157961d9102bSBob Peterson if (con->sock == NULL) /* not mutex protected so check it inside too */ 15806ed7257bSPatrick Caulfield con->connect_action(con); 158101da24d3SBob Peterson if (!list_empty(&con->writequeue)) 15826ed7257bSPatrick Caulfield send_to_sock(con); 15836ed7257bSPatrick Caulfield } 15846ed7257bSPatrick Caulfield 15856ed7257bSPatrick Caulfield static void work_stop(void) 15866ed7257bSPatrick Caulfield { 1587b355516fSDavid Windsor if (recv_workqueue) 15886ed7257bSPatrick Caulfield destroy_workqueue(recv_workqueue); 1589b355516fSDavid Windsor if (send_workqueue) 15906ed7257bSPatrick Caulfield destroy_workqueue(send_workqueue); 15916ed7257bSPatrick Caulfield } 15926ed7257bSPatrick Caulfield 15936ed7257bSPatrick Caulfield static int work_start(void) 15946ed7257bSPatrick Caulfield { 1595e43f055aSDavid Teigland recv_workqueue = alloc_workqueue("dlm_recv", 1596e43f055aSDavid Teigland WQ_UNBOUND | WQ_MEM_RECLAIM, 1); 1597b9d41052SNamhyung Kim if (!recv_workqueue) { 1598b9d41052SNamhyung Kim log_print("can't start dlm_recv"); 1599b9d41052SNamhyung Kim return -ENOMEM; 16006ed7257bSPatrick Caulfield } 16016ed7257bSPatrick Caulfield 1602e43f055aSDavid Teigland send_workqueue = alloc_workqueue("dlm_send", 1603e43f055aSDavid Teigland WQ_UNBOUND | WQ_MEM_RECLAIM, 1); 1604b9d41052SNamhyung Kim if (!send_workqueue) { 1605b9d41052SNamhyung Kim log_print("can't start dlm_send"); 16066ed7257bSPatrick Caulfield destroy_workqueue(recv_workqueue); 1607b9d41052SNamhyung Kim return -ENOMEM; 16086ed7257bSPatrick Caulfield } 16096ed7257bSPatrick Caulfield 16106ed7257bSPatrick Caulfield return 0; 16116ed7257bSPatrick Caulfield } 16126ed7257bSPatrick Caulfield 1613f0fb83cbStsutomu.owa@toshiba.co.jp static void _stop_conn(struct connection *con, bool and_other) 16146ed7257bSPatrick Caulfield { 1615f0fb83cbStsutomu.owa@toshiba.co.jp mutex_lock(&con->sock_mutex); 1616173a31feStsutomu.owa@toshiba.co.jp set_bit(CF_CLOSE, &con->flags); 1617f0fb83cbStsutomu.owa@toshiba.co.jp set_bit(CF_READ_PENDING, &con->flags); 16188a4abb08Stsutomu.owa@toshiba.co.jp set_bit(CF_WRITE_PENDING, &con->flags); 161993eaadebStsutomu.owa@toshiba.co.jp if (con->sock && con->sock->sk) { 162093eaadebStsutomu.owa@toshiba.co.jp write_lock_bh(&con->sock->sk->sk_callback_lock); 1621afb853fbSPatrick Caulfield con->sock->sk->sk_user_data = NULL; 162293eaadebStsutomu.owa@toshiba.co.jp write_unlock_bh(&con->sock->sk->sk_callback_lock); 162393eaadebStsutomu.owa@toshiba.co.jp } 1624f0fb83cbStsutomu.owa@toshiba.co.jp if (con->othercon && and_other) 1625f0fb83cbStsutomu.owa@toshiba.co.jp _stop_conn(con->othercon, false); 1626f0fb83cbStsutomu.owa@toshiba.co.jp mutex_unlock(&con->sock_mutex); 1627f0fb83cbStsutomu.owa@toshiba.co.jp } 1628f0fb83cbStsutomu.owa@toshiba.co.jp 1629f0fb83cbStsutomu.owa@toshiba.co.jp static void stop_conn(struct connection *con) 1630f0fb83cbStsutomu.owa@toshiba.co.jp { 1631f0fb83cbStsutomu.owa@toshiba.co.jp _stop_conn(con, true); 1632afb853fbSPatrick Caulfield } 16335e9ccc37SChristine Caulfield 1634055923bfSAlexander Aring static void shutdown_conn(struct connection *con) 1635055923bfSAlexander Aring { 1636055923bfSAlexander Aring if (con->shutdown_action) 1637055923bfSAlexander Aring con->shutdown_action(con); 1638055923bfSAlexander Aring } 1639055923bfSAlexander Aring 16404798cbbfSAlexander Aring static void connection_release(struct rcu_head *rcu) 16414798cbbfSAlexander Aring { 16424798cbbfSAlexander Aring struct connection *con = container_of(rcu, struct connection, rcu); 16434798cbbfSAlexander Aring 16444798cbbfSAlexander Aring kfree(con->rx_buf); 16454798cbbfSAlexander Aring kfree(con); 16464798cbbfSAlexander Aring } 16474798cbbfSAlexander Aring 16485e9ccc37SChristine Caulfield static void free_conn(struct connection *con) 16495e9ccc37SChristine Caulfield { 16500d737a8cSMarcelo Ricardo Leitner close_connection(con, true, true, true); 1651a47666ebSAlexander Aring spin_lock(&connections_lock); 1652a47666ebSAlexander Aring hlist_del_rcu(&con->list); 1653a47666ebSAlexander Aring spin_unlock(&connections_lock); 1654948c47e9SAlexander Aring if (con->othercon) { 1655948c47e9SAlexander Aring clean_one_writequeue(con->othercon); 16565cbec208SAlexander Aring call_srcu(&connections_srcu, &con->othercon->rcu, 16575cbec208SAlexander Aring connection_release); 1658948c47e9SAlexander Aring } 16590de98432SAlexander Aring clean_one_writequeue(con); 16605cbec208SAlexander Aring call_srcu(&connections_srcu, &con->rcu, connection_release); 16616ed7257bSPatrick Caulfield } 16625e9ccc37SChristine Caulfield 1663f0fb83cbStsutomu.owa@toshiba.co.jp static void work_flush(void) 1664f0fb83cbStsutomu.owa@toshiba.co.jp { 1665a47666ebSAlexander Aring int ok, idx; 1666f0fb83cbStsutomu.owa@toshiba.co.jp int i; 1667f0fb83cbStsutomu.owa@toshiba.co.jp struct connection *con; 1668f0fb83cbStsutomu.owa@toshiba.co.jp 1669f0fb83cbStsutomu.owa@toshiba.co.jp do { 1670f0fb83cbStsutomu.owa@toshiba.co.jp ok = 1; 1671f0fb83cbStsutomu.owa@toshiba.co.jp foreach_conn(stop_conn); 1672b355516fSDavid Windsor if (recv_workqueue) 1673f0fb83cbStsutomu.owa@toshiba.co.jp flush_workqueue(recv_workqueue); 1674b355516fSDavid Windsor if (send_workqueue) 1675f0fb83cbStsutomu.owa@toshiba.co.jp flush_workqueue(send_workqueue); 1676a47666ebSAlexander Aring idx = srcu_read_lock(&connections_srcu); 1677f0fb83cbStsutomu.owa@toshiba.co.jp for (i = 0; i < CONN_HASH_SIZE && ok; i++) { 1678a47666ebSAlexander Aring hlist_for_each_entry_rcu(con, &connection_hash[i], 1679a47666ebSAlexander Aring list) { 1680f0fb83cbStsutomu.owa@toshiba.co.jp ok &= test_bit(CF_READ_PENDING, &con->flags); 16818a4abb08Stsutomu.owa@toshiba.co.jp ok &= test_bit(CF_WRITE_PENDING, &con->flags); 16828a4abb08Stsutomu.owa@toshiba.co.jp if (con->othercon) { 1683f0fb83cbStsutomu.owa@toshiba.co.jp ok &= test_bit(CF_READ_PENDING, 1684f0fb83cbStsutomu.owa@toshiba.co.jp &con->othercon->flags); 16858a4abb08Stsutomu.owa@toshiba.co.jp ok &= test_bit(CF_WRITE_PENDING, 16868a4abb08Stsutomu.owa@toshiba.co.jp &con->othercon->flags); 16878a4abb08Stsutomu.owa@toshiba.co.jp } 1688f0fb83cbStsutomu.owa@toshiba.co.jp } 1689f0fb83cbStsutomu.owa@toshiba.co.jp } 1690a47666ebSAlexander Aring srcu_read_unlock(&connections_srcu, idx); 1691f0fb83cbStsutomu.owa@toshiba.co.jp } while (!ok); 1692f0fb83cbStsutomu.owa@toshiba.co.jp } 1693f0fb83cbStsutomu.owa@toshiba.co.jp 16945e9ccc37SChristine Caulfield void dlm_lowcomms_stop(void) 16955e9ccc37SChristine Caulfield { 16965e9ccc37SChristine Caulfield /* Set all the flags to prevent any 16975e9ccc37SChristine Caulfield socket activity. 16985e9ccc37SChristine Caulfield */ 1699513ef596SDavid Teigland dlm_allow_conn = 0; 1700aa7ab1e2SAlexander Aring 1701aa7ab1e2SAlexander Aring if (recv_workqueue) 1702aa7ab1e2SAlexander Aring flush_workqueue(recv_workqueue); 1703aa7ab1e2SAlexander Aring if (send_workqueue) 1704aa7ab1e2SAlexander Aring flush_workqueue(send_workqueue); 1705aa7ab1e2SAlexander Aring 1706d11ccd45SAlexander Aring dlm_close_sock(&listen_con.sock); 1707d11ccd45SAlexander Aring 1708055923bfSAlexander Aring foreach_conn(shutdown_conn); 1709f0fb83cbStsutomu.owa@toshiba.co.jp work_flush(); 17103a8db798SMarcelo Ricardo Leitner foreach_conn(free_conn); 17116ed7257bSPatrick Caulfield work_stop(); 1712043697f0SAlexander Aring deinit_local(); 17136ed7257bSPatrick Caulfield } 17146ed7257bSPatrick Caulfield 17156ed7257bSPatrick Caulfield int dlm_lowcomms_start(void) 17166ed7257bSPatrick Caulfield { 17176ed7257bSPatrick Caulfield int error = -EINVAL; 17185e9ccc37SChristine Caulfield int i; 17195e9ccc37SChristine Caulfield 17205e9ccc37SChristine Caulfield for (i = 0; i < CONN_HASH_SIZE; i++) 17215e9ccc37SChristine Caulfield INIT_HLIST_HEAD(&connection_hash[i]); 17226ed7257bSPatrick Caulfield 17236ed7257bSPatrick Caulfield init_local(); 17246ed7257bSPatrick Caulfield if (!dlm_local_count) { 1725617e82e1SDavid Teigland error = -ENOTCONN; 17266ed7257bSPatrick Caulfield log_print("no local IP address has been set"); 1727513ef596SDavid Teigland goto fail; 17286ed7257bSPatrick Caulfield } 17296ed7257bSPatrick Caulfield 1730d11ccd45SAlexander Aring INIT_WORK(&listen_con.rwork, process_listen_recv_socket); 1731d11ccd45SAlexander Aring 1732513ef596SDavid Teigland error = work_start(); 1733513ef596SDavid Teigland if (error) 1734a47666ebSAlexander Aring goto fail; 1735513ef596SDavid Teigland 1736513ef596SDavid Teigland dlm_allow_conn = 1; 17376ed7257bSPatrick Caulfield 17386ed7257bSPatrick Caulfield /* Start listening */ 17396ed7257bSPatrick Caulfield if (dlm_config.ci_protocol == 0) 17406ed7257bSPatrick Caulfield error = tcp_listen_for_all(); 17416ed7257bSPatrick Caulfield else 1742d11ccd45SAlexander Aring error = sctp_listen_for_all(&listen_con); 17436ed7257bSPatrick Caulfield if (error) 17446ed7257bSPatrick Caulfield goto fail_unlisten; 17456ed7257bSPatrick Caulfield 17466ed7257bSPatrick Caulfield return 0; 17476ed7257bSPatrick Caulfield 17486ed7257bSPatrick Caulfield fail_unlisten: 1749513ef596SDavid Teigland dlm_allow_conn = 0; 1750d11ccd45SAlexander Aring dlm_close_sock(&listen_con.sock); 1751513ef596SDavid Teigland fail: 17526ed7257bSPatrick Caulfield return error; 17536ed7257bSPatrick Caulfield } 175436b71a8bSDavid Teigland 175536b71a8bSDavid Teigland void dlm_lowcomms_exit(void) 175636b71a8bSDavid Teigland { 175736b71a8bSDavid Teigland struct dlm_node_addr *na, *safe; 175836b71a8bSDavid Teigland 175936b71a8bSDavid Teigland spin_lock(&dlm_node_addrs_spin); 176036b71a8bSDavid Teigland list_for_each_entry_safe(na, safe, &dlm_node_addrs, list) { 176136b71a8bSDavid Teigland list_del(&na->list); 176236b71a8bSDavid Teigland while (na->addr_count--) 176336b71a8bSDavid Teigland kfree(na->addr[na->addr_count]); 176436b71a8bSDavid Teigland kfree(na); 176536b71a8bSDavid Teigland } 176636b71a8bSDavid Teigland spin_unlock(&dlm_node_addrs_spin); 176736b71a8bSDavid Teigland } 1768