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) 626ed7257bSPatrick Caulfield 63f92c8dd7SBob Peterson /* Number of messages to send before rescheduling */ 64f92c8dd7SBob Peterson #define MAX_SEND_MSG_COUNT 25 65055923bfSAlexander Aring #define DLM_SHUTDOWN_WAIT_TIMEOUT msecs_to_jiffies(10000) 66f92c8dd7SBob Peterson 676ed7257bSPatrick Caulfield struct connection { 686ed7257bSPatrick Caulfield struct socket *sock; /* NULL if not connected */ 696ed7257bSPatrick Caulfield uint32_t nodeid; /* So we know who we are in the list */ 706ed7257bSPatrick Caulfield struct mutex sock_mutex; 716ed7257bSPatrick Caulfield unsigned long flags; 726ed7257bSPatrick Caulfield #define CF_READ_PENDING 1 738a4abb08Stsutomu.owa@toshiba.co.jp #define CF_WRITE_PENDING 2 746ed7257bSPatrick Caulfield #define CF_INIT_PENDING 4 756ed7257bSPatrick Caulfield #define CF_IS_OTHERCON 5 76063c4c99SLars Marowsky-Bree #define CF_CLOSE 6 77b36930ddSDavid Miller #define CF_APP_LIMITED 7 78b2a66629Stsutomu.owa@toshiba.co.jp #define CF_CLOSING 8 79055923bfSAlexander Aring #define CF_SHUTDOWN 9 8019633c7eSAlexander Aring #define CF_CONNECTED 10 81ba868d9dSAlexander Aring #define CF_RECONNECT 11 82ba868d9dSAlexander Aring #define CF_DELAY_CONNECT 12 838aa31cbfSAlexander Aring #define CF_EOF 13 846ed7257bSPatrick Caulfield struct list_head writequeue; /* List of outgoing writequeue_entries */ 856ed7257bSPatrick Caulfield spinlock_t writequeue_lock; 868aa31cbfSAlexander Aring atomic_t writequeue_cnt; 876ed7257bSPatrick Caulfield void (*connect_action) (struct connection *); /* What to do to connect */ 88055923bfSAlexander Aring void (*shutdown_action)(struct connection *con); /* What to do to shutdown */ 898aa31cbfSAlexander Aring bool (*eof_condition)(struct connection *con); /* What to do to eof check */ 906ed7257bSPatrick Caulfield int retries; 916ed7257bSPatrick Caulfield #define MAX_CONNECT_RETRIES 3 925e9ccc37SChristine Caulfield struct hlist_node list; 936ed7257bSPatrick Caulfield struct connection *othercon; 94ba868d9dSAlexander Aring struct connection *sendcon; 956ed7257bSPatrick Caulfield struct work_struct rwork; /* Receive workqueue */ 966ed7257bSPatrick Caulfield struct work_struct swork; /* Send workqueue */ 97055923bfSAlexander Aring wait_queue_head_t shutdown_wait; /* wait for graceful shutdown */ 984798cbbfSAlexander Aring unsigned char *rx_buf; 994798cbbfSAlexander Aring int rx_buflen; 1004798cbbfSAlexander Aring int rx_leftover; 101a47666ebSAlexander Aring struct rcu_head rcu; 1026ed7257bSPatrick Caulfield }; 1036ed7257bSPatrick Caulfield #define sock2con(x) ((struct connection *)(x)->sk_user_data) 1046ed7257bSPatrick Caulfield 105d11ccd45SAlexander Aring struct listen_connection { 106d11ccd45SAlexander Aring struct socket *sock; 107d11ccd45SAlexander Aring struct work_struct rwork; 108d11ccd45SAlexander Aring }; 109d11ccd45SAlexander Aring 110f0747ebfSAlexander Aring #define DLM_WQ_REMAIN_BYTES(e) (PAGE_SIZE - e->end) 111f0747ebfSAlexander Aring #define DLM_WQ_LENGTH_BYTES(e) (e->end - e->offset) 112f0747ebfSAlexander Aring 1136ed7257bSPatrick Caulfield /* An entry waiting to be sent */ 1146ed7257bSPatrick Caulfield struct writequeue_entry { 1156ed7257bSPatrick Caulfield struct list_head list; 1166ed7257bSPatrick Caulfield struct page *page; 1176ed7257bSPatrick Caulfield int offset; 1186ed7257bSPatrick Caulfield int len; 1196ed7257bSPatrick Caulfield int end; 1206ed7257bSPatrick Caulfield int users; 121706474fbSAlexander Aring bool dirty; 1226ed7257bSPatrick Caulfield struct connection *con; 1238f2dc78dSAlexander Aring struct list_head msgs; 1248f2dc78dSAlexander Aring struct kref ref; 1258f2dc78dSAlexander Aring }; 1268f2dc78dSAlexander Aring 1278f2dc78dSAlexander Aring struct dlm_msg { 1288f2dc78dSAlexander Aring struct writequeue_entry *entry; 1292874d1a6SAlexander Aring struct dlm_msg *orig_msg; 1302874d1a6SAlexander Aring bool retransmit; 1318f2dc78dSAlexander Aring void *ppc; 1328f2dc78dSAlexander Aring int len; 1338f2dc78dSAlexander Aring int idx; /* new()/commit() idx exchange */ 1348f2dc78dSAlexander Aring 1358f2dc78dSAlexander Aring struct list_head list; 1368f2dc78dSAlexander Aring struct kref ref; 1376ed7257bSPatrick Caulfield }; 1386ed7257bSPatrick Caulfield 13936b71a8bSDavid Teigland struct dlm_node_addr { 14036b71a8bSDavid Teigland struct list_head list; 14136b71a8bSDavid Teigland int nodeid; 142e125fbebSAlexander Aring int mark; 14336b71a8bSDavid Teigland int addr_count; 14498e1b60eSMike Christie int curr_addr_index; 14536b71a8bSDavid Teigland struct sockaddr_storage *addr[DLM_MAX_ADDR_COUNT]; 14636b71a8bSDavid Teigland }; 14736b71a8bSDavid Teigland 148cc661fc9SBob Peterson static struct listen_sock_callbacks { 149cc661fc9SBob Peterson void (*sk_error_report)(struct sock *); 150cc661fc9SBob Peterson void (*sk_data_ready)(struct sock *); 151cc661fc9SBob Peterson void (*sk_state_change)(struct sock *); 152cc661fc9SBob Peterson void (*sk_write_space)(struct sock *); 153cc661fc9SBob Peterson } listen_sock; 154cc661fc9SBob Peterson 15536b71a8bSDavid Teigland static LIST_HEAD(dlm_node_addrs); 15636b71a8bSDavid Teigland static DEFINE_SPINLOCK(dlm_node_addrs_spin); 15736b71a8bSDavid Teigland 158d11ccd45SAlexander Aring static struct listen_connection listen_con; 1596ed7257bSPatrick Caulfield static struct sockaddr_storage *dlm_local_addr[DLM_MAX_ADDR_COUNT]; 1606ed7257bSPatrick Caulfield static int dlm_local_count; 16151746163SAlexander Aring int dlm_allow_conn; 1626ed7257bSPatrick Caulfield 1636ed7257bSPatrick Caulfield /* Work queues */ 1646ed7257bSPatrick Caulfield static struct workqueue_struct *recv_workqueue; 1656ed7257bSPatrick Caulfield static struct workqueue_struct *send_workqueue; 1666ed7257bSPatrick Caulfield 1675e9ccc37SChristine Caulfield static struct hlist_head connection_hash[CONN_HASH_SIZE]; 168a47666ebSAlexander Aring static DEFINE_SPINLOCK(connections_lock); 169a47666ebSAlexander Aring DEFINE_STATIC_SRCU(connections_srcu); 1706ed7257bSPatrick Caulfield 1716ed7257bSPatrick Caulfield static void process_recv_sockets(struct work_struct *work); 1726ed7257bSPatrick Caulfield static void process_send_sockets(struct work_struct *work); 1736ed7257bSPatrick Caulfield 1740672c3c2SAlexander Aring static void sctp_connect_to_sock(struct connection *con); 1750672c3c2SAlexander Aring static void tcp_connect_to_sock(struct connection *con); 17642873c90SAlexander Aring static void dlm_tcp_shutdown(struct connection *con); 1775e9ccc37SChristine Caulfield 178b38bc9c2SAlexander Aring static struct connection *__find_con(int nodeid, int r) 1795e9ccc37SChristine Caulfield { 1805e9ccc37SChristine Caulfield struct connection *con; 1815e9ccc37SChristine Caulfield 182a47666ebSAlexander Aring hlist_for_each_entry_rcu(con, &connection_hash[r], list) { 183b38bc9c2SAlexander Aring if (con->nodeid == nodeid) 1845e9ccc37SChristine Caulfield return con; 1855e9ccc37SChristine Caulfield } 186a47666ebSAlexander Aring 1875e9ccc37SChristine Caulfield return NULL; 1885e9ccc37SChristine Caulfield } 1895e9ccc37SChristine Caulfield 1908aa31cbfSAlexander Aring static bool tcp_eof_condition(struct connection *con) 1918aa31cbfSAlexander Aring { 1928aa31cbfSAlexander Aring return atomic_read(&con->writequeue_cnt); 1938aa31cbfSAlexander Aring } 1948aa31cbfSAlexander Aring 1956cde210aSAlexander Aring static int dlm_con_init(struct connection *con, int nodeid) 1966ed7257bSPatrick Caulfield { 1974798cbbfSAlexander Aring con->rx_buflen = dlm_config.ci_buffer_size; 1984798cbbfSAlexander Aring con->rx_buf = kmalloc(con->rx_buflen, GFP_NOFS); 1996cde210aSAlexander Aring if (!con->rx_buf) 2006cde210aSAlexander Aring return -ENOMEM; 2014798cbbfSAlexander Aring 2026ed7257bSPatrick Caulfield con->nodeid = nodeid; 2036ed7257bSPatrick Caulfield mutex_init(&con->sock_mutex); 2046ed7257bSPatrick Caulfield INIT_LIST_HEAD(&con->writequeue); 2056ed7257bSPatrick Caulfield spin_lock_init(&con->writequeue_lock); 2068aa31cbfSAlexander Aring atomic_set(&con->writequeue_cnt, 0); 2076ed7257bSPatrick Caulfield INIT_WORK(&con->swork, process_send_sockets); 2086ed7257bSPatrick Caulfield INIT_WORK(&con->rwork, process_recv_sockets); 209055923bfSAlexander Aring init_waitqueue_head(&con->shutdown_wait); 2106ed7257bSPatrick Caulfield 21142873c90SAlexander Aring if (dlm_config.ci_protocol == 0) { 2120672c3c2SAlexander Aring con->connect_action = tcp_connect_to_sock; 21342873c90SAlexander Aring con->shutdown_action = dlm_tcp_shutdown; 2148aa31cbfSAlexander Aring con->eof_condition = tcp_eof_condition; 21542873c90SAlexander Aring } else { 2160672c3c2SAlexander Aring con->connect_action = sctp_connect_to_sock; 21742873c90SAlexander Aring } 2186ed7257bSPatrick Caulfield 2196cde210aSAlexander Aring return 0; 2206cde210aSAlexander Aring } 2216cde210aSAlexander Aring 2226cde210aSAlexander Aring /* 2236cde210aSAlexander Aring * If 'allocation' is zero then we don't attempt to create a new 2246cde210aSAlexander Aring * connection structure for this node. 2256cde210aSAlexander Aring */ 2266cde210aSAlexander Aring static struct connection *nodeid2con(int nodeid, gfp_t alloc) 2276cde210aSAlexander Aring { 2286cde210aSAlexander Aring struct connection *con, *tmp; 2296cde210aSAlexander Aring int r, ret; 2306cde210aSAlexander Aring 231b38bc9c2SAlexander Aring r = nodeid_hash(nodeid); 232b38bc9c2SAlexander Aring con = __find_con(nodeid, r); 2336cde210aSAlexander Aring if (con || !alloc) 2346cde210aSAlexander Aring return con; 2356cde210aSAlexander Aring 2366cde210aSAlexander Aring con = kzalloc(sizeof(*con), alloc); 2376cde210aSAlexander Aring if (!con) 2386cde210aSAlexander Aring return NULL; 2396cde210aSAlexander Aring 2406cde210aSAlexander Aring ret = dlm_con_init(con, nodeid); 2416cde210aSAlexander Aring if (ret) { 2426cde210aSAlexander Aring kfree(con); 2436cde210aSAlexander Aring return NULL; 2446cde210aSAlexander Aring } 2456cde210aSAlexander Aring 246a47666ebSAlexander Aring spin_lock(&connections_lock); 2474f2b30fdSAlexander Aring /* Because multiple workqueues/threads calls this function it can 2484f2b30fdSAlexander Aring * race on multiple cpu's. Instead of locking hot path __find_con() 2494f2b30fdSAlexander Aring * we just check in rare cases of recently added nodes again 2504f2b30fdSAlexander Aring * under protection of connections_lock. If this is the case we 2514f2b30fdSAlexander Aring * abort our connection creation and return the existing connection. 2524f2b30fdSAlexander Aring */ 253b38bc9c2SAlexander Aring tmp = __find_con(nodeid, r); 2544f2b30fdSAlexander Aring if (tmp) { 2554f2b30fdSAlexander Aring spin_unlock(&connections_lock); 2564f2b30fdSAlexander Aring kfree(con->rx_buf); 2574f2b30fdSAlexander Aring kfree(con); 2584f2b30fdSAlexander Aring return tmp; 2594f2b30fdSAlexander Aring } 2604f2b30fdSAlexander Aring 261a47666ebSAlexander Aring hlist_add_head_rcu(&con->list, &connection_hash[r]); 262a47666ebSAlexander Aring spin_unlock(&connections_lock); 263a47666ebSAlexander Aring 2646ed7257bSPatrick Caulfield return con; 2656ed7257bSPatrick Caulfield } 2666ed7257bSPatrick Caulfield 2675e9ccc37SChristine Caulfield /* Loop round all connections */ 2685e9ccc37SChristine Caulfield static void foreach_conn(void (*conn_func)(struct connection *c)) 2695e9ccc37SChristine Caulfield { 270b38bc9c2SAlexander Aring int i; 2715e9ccc37SChristine Caulfield struct connection *con; 2725e9ccc37SChristine Caulfield 2735e9ccc37SChristine Caulfield for (i = 0; i < CONN_HASH_SIZE; i++) { 274a47666ebSAlexander Aring hlist_for_each_entry_rcu(con, &connection_hash[i], list) 2755e9ccc37SChristine Caulfield conn_func(con); 2765e9ccc37SChristine Caulfield } 2776ed7257bSPatrick Caulfield } 2786ed7257bSPatrick Caulfield 27936b71a8bSDavid Teigland static struct dlm_node_addr *find_node_addr(int nodeid) 2806ed7257bSPatrick Caulfield { 28136b71a8bSDavid Teigland struct dlm_node_addr *na; 28236b71a8bSDavid Teigland 28336b71a8bSDavid Teigland list_for_each_entry(na, &dlm_node_addrs, list) { 28436b71a8bSDavid Teigland if (na->nodeid == nodeid) 28536b71a8bSDavid Teigland return na; 28636b71a8bSDavid Teigland } 28736b71a8bSDavid Teigland return NULL; 28836b71a8bSDavid Teigland } 28936b71a8bSDavid Teigland 29040c6b83eSAlexander Aring static int addr_compare(const struct sockaddr_storage *x, 29140c6b83eSAlexander Aring const struct sockaddr_storage *y) 29236b71a8bSDavid Teigland { 29336b71a8bSDavid Teigland switch (x->ss_family) { 29436b71a8bSDavid Teigland case AF_INET: { 29536b71a8bSDavid Teigland struct sockaddr_in *sinx = (struct sockaddr_in *)x; 29636b71a8bSDavid Teigland struct sockaddr_in *siny = (struct sockaddr_in *)y; 29736b71a8bSDavid Teigland if (sinx->sin_addr.s_addr != siny->sin_addr.s_addr) 29836b71a8bSDavid Teigland return 0; 29936b71a8bSDavid Teigland if (sinx->sin_port != siny->sin_port) 30036b71a8bSDavid Teigland return 0; 30136b71a8bSDavid Teigland break; 30236b71a8bSDavid Teigland } 30336b71a8bSDavid Teigland case AF_INET6: { 30436b71a8bSDavid Teigland struct sockaddr_in6 *sinx = (struct sockaddr_in6 *)x; 30536b71a8bSDavid Teigland struct sockaddr_in6 *siny = (struct sockaddr_in6 *)y; 30636b71a8bSDavid Teigland if (!ipv6_addr_equal(&sinx->sin6_addr, &siny->sin6_addr)) 30736b71a8bSDavid Teigland return 0; 30836b71a8bSDavid Teigland if (sinx->sin6_port != siny->sin6_port) 30936b71a8bSDavid Teigland return 0; 31036b71a8bSDavid Teigland break; 31136b71a8bSDavid Teigland } 31236b71a8bSDavid Teigland default: 31336b71a8bSDavid Teigland return 0; 31436b71a8bSDavid Teigland } 31536b71a8bSDavid Teigland return 1; 31636b71a8bSDavid Teigland } 31736b71a8bSDavid Teigland 31836b71a8bSDavid Teigland static int nodeid_to_addr(int nodeid, struct sockaddr_storage *sas_out, 319e125fbebSAlexander Aring struct sockaddr *sa_out, bool try_new_addr, 320e125fbebSAlexander Aring unsigned int *mark) 32136b71a8bSDavid Teigland { 32236b71a8bSDavid Teigland struct sockaddr_storage sas; 32336b71a8bSDavid Teigland struct dlm_node_addr *na; 3246ed7257bSPatrick Caulfield 3256ed7257bSPatrick Caulfield if (!dlm_local_count) 3266ed7257bSPatrick Caulfield return -1; 3276ed7257bSPatrick Caulfield 32836b71a8bSDavid Teigland spin_lock(&dlm_node_addrs_spin); 32936b71a8bSDavid Teigland na = find_node_addr(nodeid); 33098e1b60eSMike Christie if (na && na->addr_count) { 331ee44b4bcSMarcelo Ricardo Leitner memcpy(&sas, na->addr[na->curr_addr_index], 332ee44b4bcSMarcelo Ricardo Leitner sizeof(struct sockaddr_storage)); 333ee44b4bcSMarcelo Ricardo Leitner 33498e1b60eSMike Christie if (try_new_addr) { 33598e1b60eSMike Christie na->curr_addr_index++; 33698e1b60eSMike Christie if (na->curr_addr_index == na->addr_count) 33798e1b60eSMike Christie na->curr_addr_index = 0; 33898e1b60eSMike Christie } 33998e1b60eSMike Christie } 34036b71a8bSDavid Teigland spin_unlock(&dlm_node_addrs_spin); 34136b71a8bSDavid Teigland 34236b71a8bSDavid Teigland if (!na) 34336b71a8bSDavid Teigland return -EEXIST; 34436b71a8bSDavid Teigland 34536b71a8bSDavid Teigland if (!na->addr_count) 34636b71a8bSDavid Teigland return -ENOENT; 34736b71a8bSDavid Teigland 348e125fbebSAlexander Aring *mark = na->mark; 349e125fbebSAlexander Aring 35036b71a8bSDavid Teigland if (sas_out) 35136b71a8bSDavid Teigland memcpy(sas_out, &sas, sizeof(struct sockaddr_storage)); 35236b71a8bSDavid Teigland 35336b71a8bSDavid Teigland if (!sa_out) 35436b71a8bSDavid Teigland return 0; 3556ed7257bSPatrick Caulfield 3566ed7257bSPatrick Caulfield if (dlm_local_addr[0]->ss_family == AF_INET) { 35736b71a8bSDavid Teigland struct sockaddr_in *in4 = (struct sockaddr_in *) &sas; 35836b71a8bSDavid Teigland struct sockaddr_in *ret4 = (struct sockaddr_in *) sa_out; 3596ed7257bSPatrick Caulfield ret4->sin_addr.s_addr = in4->sin_addr.s_addr; 3606ed7257bSPatrick Caulfield } else { 36136b71a8bSDavid Teigland struct sockaddr_in6 *in6 = (struct sockaddr_in6 *) &sas; 36236b71a8bSDavid Teigland struct sockaddr_in6 *ret6 = (struct sockaddr_in6 *) sa_out; 3634e3fd7a0SAlexey Dobriyan ret6->sin6_addr = in6->sin6_addr; 3646ed7257bSPatrick Caulfield } 3656ed7257bSPatrick Caulfield 3666ed7257bSPatrick Caulfield return 0; 3676ed7257bSPatrick Caulfield } 3686ed7257bSPatrick Caulfield 369e125fbebSAlexander Aring static int addr_to_nodeid(struct sockaddr_storage *addr, int *nodeid, 370e125fbebSAlexander Aring unsigned int *mark) 37136b71a8bSDavid Teigland { 37236b71a8bSDavid Teigland struct dlm_node_addr *na; 37336b71a8bSDavid Teigland int rv = -EEXIST; 37498e1b60eSMike Christie int addr_i; 37536b71a8bSDavid Teigland 37636b71a8bSDavid Teigland spin_lock(&dlm_node_addrs_spin); 37736b71a8bSDavid Teigland list_for_each_entry(na, &dlm_node_addrs, list) { 37836b71a8bSDavid Teigland if (!na->addr_count) 37936b71a8bSDavid Teigland continue; 38036b71a8bSDavid Teigland 38198e1b60eSMike Christie for (addr_i = 0; addr_i < na->addr_count; addr_i++) { 38298e1b60eSMike Christie if (addr_compare(na->addr[addr_i], addr)) { 38336b71a8bSDavid Teigland *nodeid = na->nodeid; 384e125fbebSAlexander Aring *mark = na->mark; 38536b71a8bSDavid Teigland rv = 0; 38698e1b60eSMike Christie goto unlock; 38736b71a8bSDavid Teigland } 38898e1b60eSMike Christie } 38998e1b60eSMike Christie } 39098e1b60eSMike Christie unlock: 39136b71a8bSDavid Teigland spin_unlock(&dlm_node_addrs_spin); 39236b71a8bSDavid Teigland return rv; 39336b71a8bSDavid Teigland } 39436b71a8bSDavid Teigland 3954f19d071SAlexander Aring /* caller need to held dlm_node_addrs_spin lock */ 3964f19d071SAlexander Aring static bool dlm_lowcomms_na_has_addr(const struct dlm_node_addr *na, 3974f19d071SAlexander Aring const struct sockaddr_storage *addr) 3984f19d071SAlexander Aring { 3994f19d071SAlexander Aring int i; 4004f19d071SAlexander Aring 4014f19d071SAlexander Aring for (i = 0; i < na->addr_count; i++) { 4024f19d071SAlexander Aring if (addr_compare(na->addr[i], addr)) 4034f19d071SAlexander Aring return true; 4044f19d071SAlexander Aring } 4054f19d071SAlexander Aring 4064f19d071SAlexander Aring return false; 4074f19d071SAlexander Aring } 4084f19d071SAlexander Aring 40936b71a8bSDavid Teigland int dlm_lowcomms_addr(int nodeid, struct sockaddr_storage *addr, int len) 41036b71a8bSDavid Teigland { 41136b71a8bSDavid Teigland struct sockaddr_storage *new_addr; 41236b71a8bSDavid Teigland struct dlm_node_addr *new_node, *na; 4134f19d071SAlexander Aring bool ret; 41436b71a8bSDavid Teigland 41536b71a8bSDavid Teigland new_node = kzalloc(sizeof(struct dlm_node_addr), GFP_NOFS); 41636b71a8bSDavid Teigland if (!new_node) 41736b71a8bSDavid Teigland return -ENOMEM; 41836b71a8bSDavid Teigland 41936b71a8bSDavid Teigland new_addr = kzalloc(sizeof(struct sockaddr_storage), GFP_NOFS); 42036b71a8bSDavid Teigland if (!new_addr) { 42136b71a8bSDavid Teigland kfree(new_node); 42236b71a8bSDavid Teigland return -ENOMEM; 42336b71a8bSDavid Teigland } 42436b71a8bSDavid Teigland 42536b71a8bSDavid Teigland memcpy(new_addr, addr, len); 42636b71a8bSDavid Teigland 42736b71a8bSDavid Teigland spin_lock(&dlm_node_addrs_spin); 42836b71a8bSDavid Teigland na = find_node_addr(nodeid); 42936b71a8bSDavid Teigland if (!na) { 43036b71a8bSDavid Teigland new_node->nodeid = nodeid; 43136b71a8bSDavid Teigland new_node->addr[0] = new_addr; 43236b71a8bSDavid Teigland new_node->addr_count = 1; 433e125fbebSAlexander Aring new_node->mark = dlm_config.ci_mark; 43436b71a8bSDavid Teigland list_add(&new_node->list, &dlm_node_addrs); 43536b71a8bSDavid Teigland spin_unlock(&dlm_node_addrs_spin); 43636b71a8bSDavid Teigland return 0; 43736b71a8bSDavid Teigland } 43836b71a8bSDavid Teigland 4394f19d071SAlexander Aring ret = dlm_lowcomms_na_has_addr(na, addr); 4404f19d071SAlexander Aring if (ret) { 4414f19d071SAlexander Aring spin_unlock(&dlm_node_addrs_spin); 4424f19d071SAlexander Aring kfree(new_addr); 4434f19d071SAlexander Aring kfree(new_node); 4444f19d071SAlexander Aring return -EEXIST; 4454f19d071SAlexander Aring } 4464f19d071SAlexander Aring 44736b71a8bSDavid Teigland if (na->addr_count >= DLM_MAX_ADDR_COUNT) { 44836b71a8bSDavid Teigland spin_unlock(&dlm_node_addrs_spin); 44936b71a8bSDavid Teigland kfree(new_addr); 45036b71a8bSDavid Teigland kfree(new_node); 45136b71a8bSDavid Teigland return -ENOSPC; 45236b71a8bSDavid Teigland } 45336b71a8bSDavid Teigland 45436b71a8bSDavid Teigland na->addr[na->addr_count++] = new_addr; 45536b71a8bSDavid Teigland spin_unlock(&dlm_node_addrs_spin); 45636b71a8bSDavid Teigland kfree(new_node); 45736b71a8bSDavid Teigland return 0; 45836b71a8bSDavid Teigland } 45936b71a8bSDavid Teigland 4606ed7257bSPatrick Caulfield /* Data available on socket or listen socket received a connect */ 461676d2369SDavid S. Miller static void lowcomms_data_ready(struct sock *sk) 4626ed7257bSPatrick Caulfield { 46393eaadebStsutomu.owa@toshiba.co.jp struct connection *con; 46493eaadebStsutomu.owa@toshiba.co.jp 46593eaadebStsutomu.owa@toshiba.co.jp read_lock_bh(&sk->sk_callback_lock); 46693eaadebStsutomu.owa@toshiba.co.jp con = sock2con(sk); 467afb853fbSPatrick Caulfield if (con && !test_and_set_bit(CF_READ_PENDING, &con->flags)) 4686ed7257bSPatrick Caulfield queue_work(recv_workqueue, &con->rwork); 46993eaadebStsutomu.owa@toshiba.co.jp read_unlock_bh(&sk->sk_callback_lock); 4706ed7257bSPatrick Caulfield } 4716ed7257bSPatrick Caulfield 472d11ccd45SAlexander Aring static void lowcomms_listen_data_ready(struct sock *sk) 473d11ccd45SAlexander Aring { 474*9a4139a7SAlexander Aring if (!dlm_allow_conn) 475*9a4139a7SAlexander Aring return; 476*9a4139a7SAlexander Aring 477d11ccd45SAlexander Aring queue_work(recv_workqueue, &listen_con.rwork); 478d11ccd45SAlexander Aring } 479d11ccd45SAlexander Aring 4806ed7257bSPatrick Caulfield static void lowcomms_write_space(struct sock *sk) 4816ed7257bSPatrick Caulfield { 48293eaadebStsutomu.owa@toshiba.co.jp struct connection *con; 4836ed7257bSPatrick Caulfield 48493eaadebStsutomu.owa@toshiba.co.jp read_lock_bh(&sk->sk_callback_lock); 48593eaadebStsutomu.owa@toshiba.co.jp con = sock2con(sk); 486b36930ddSDavid Miller if (!con) 48793eaadebStsutomu.owa@toshiba.co.jp goto out; 488b36930ddSDavid Miller 48919633c7eSAlexander Aring if (!test_and_set_bit(CF_CONNECTED, &con->flags)) { 49019633c7eSAlexander Aring log_print("successful connected to node %d", con->nodeid); 49119633c7eSAlexander Aring queue_work(send_workqueue, &con->swork); 49219633c7eSAlexander Aring goto out; 49319633c7eSAlexander Aring } 49419633c7eSAlexander Aring 495b36930ddSDavid Miller clear_bit(SOCK_NOSPACE, &con->sock->flags); 496b36930ddSDavid Miller 497b36930ddSDavid Miller if (test_and_clear_bit(CF_APP_LIMITED, &con->flags)) { 498b36930ddSDavid Miller con->sock->sk->sk_write_pending--; 4999cd3e072SEric Dumazet clear_bit(SOCKWQ_ASYNC_NOSPACE, &con->sock->flags); 500b36930ddSDavid Miller } 501b36930ddSDavid Miller 5026ed7257bSPatrick Caulfield queue_work(send_workqueue, &con->swork); 50393eaadebStsutomu.owa@toshiba.co.jp out: 50493eaadebStsutomu.owa@toshiba.co.jp read_unlock_bh(&sk->sk_callback_lock); 5056ed7257bSPatrick Caulfield } 5066ed7257bSPatrick Caulfield 5076ed7257bSPatrick Caulfield static inline void lowcomms_connect_sock(struct connection *con) 5086ed7257bSPatrick Caulfield { 509063c4c99SLars Marowsky-Bree if (test_bit(CF_CLOSE, &con->flags)) 510063c4c99SLars Marowsky-Bree return; 5116ed7257bSPatrick Caulfield queue_work(send_workqueue, &con->swork); 51261d9102bSBob Peterson cond_resched(); 5136ed7257bSPatrick Caulfield } 5146ed7257bSPatrick Caulfield 5156ed7257bSPatrick Caulfield static void lowcomms_state_change(struct sock *sk) 5166ed7257bSPatrick Caulfield { 517ee44b4bcSMarcelo Ricardo Leitner /* SCTP layer is not calling sk_data_ready when the connection 518ee44b4bcSMarcelo Ricardo Leitner * is done, so we catch the signal through here. Also, it 519ee44b4bcSMarcelo Ricardo Leitner * doesn't switch socket state when entering shutdown, so we 520ee44b4bcSMarcelo Ricardo Leitner * skip the write in that case. 521ee44b4bcSMarcelo Ricardo Leitner */ 522ee44b4bcSMarcelo Ricardo Leitner if (sk->sk_shutdown) { 523ee44b4bcSMarcelo Ricardo Leitner if (sk->sk_shutdown == RCV_SHUTDOWN) 524ee44b4bcSMarcelo Ricardo Leitner lowcomms_data_ready(sk); 525ee44b4bcSMarcelo Ricardo Leitner } else if (sk->sk_state == TCP_ESTABLISHED) { 5266ed7257bSPatrick Caulfield lowcomms_write_space(sk); 5276ed7257bSPatrick Caulfield } 528ee44b4bcSMarcelo Ricardo Leitner } 5296ed7257bSPatrick Caulfield 530391fbdc5SChristine Caulfield int dlm_lowcomms_connect_node(int nodeid) 531391fbdc5SChristine Caulfield { 532391fbdc5SChristine Caulfield struct connection *con; 533b38bc9c2SAlexander Aring int idx; 534391fbdc5SChristine Caulfield 535391fbdc5SChristine Caulfield if (nodeid == dlm_our_nodeid()) 536391fbdc5SChristine Caulfield return 0; 537391fbdc5SChristine Caulfield 538b38bc9c2SAlexander Aring idx = srcu_read_lock(&connections_srcu); 539391fbdc5SChristine Caulfield con = nodeid2con(nodeid, GFP_NOFS); 540b38bc9c2SAlexander Aring if (!con) { 541b38bc9c2SAlexander Aring srcu_read_unlock(&connections_srcu, idx); 542391fbdc5SChristine Caulfield return -ENOMEM; 543b38bc9c2SAlexander Aring } 544b38bc9c2SAlexander Aring 545391fbdc5SChristine Caulfield lowcomms_connect_sock(con); 546b38bc9c2SAlexander Aring srcu_read_unlock(&connections_srcu, idx); 547b38bc9c2SAlexander Aring 548391fbdc5SChristine Caulfield return 0; 549391fbdc5SChristine Caulfield } 550391fbdc5SChristine Caulfield 551e125fbebSAlexander Aring int dlm_lowcomms_nodes_set_mark(int nodeid, unsigned int mark) 552e125fbebSAlexander Aring { 553e125fbebSAlexander Aring struct dlm_node_addr *na; 554e125fbebSAlexander Aring 555e125fbebSAlexander Aring spin_lock(&dlm_node_addrs_spin); 556e125fbebSAlexander Aring na = find_node_addr(nodeid); 557e125fbebSAlexander Aring if (!na) { 558e125fbebSAlexander Aring spin_unlock(&dlm_node_addrs_spin); 559e125fbebSAlexander Aring return -ENOENT; 560e125fbebSAlexander Aring } 561e125fbebSAlexander Aring 562e125fbebSAlexander Aring na->mark = mark; 563e125fbebSAlexander Aring spin_unlock(&dlm_node_addrs_spin); 564e125fbebSAlexander Aring 565e125fbebSAlexander Aring return 0; 566e125fbebSAlexander Aring } 567e125fbebSAlexander Aring 568b3a5bbfdSBob Peterson static void lowcomms_error_report(struct sock *sk) 569b3a5bbfdSBob Peterson { 570b81171cbSBob Peterson struct connection *con; 571b3a5bbfdSBob Peterson struct sockaddr_storage saddr; 572b81171cbSBob Peterson void (*orig_report)(struct sock *) = NULL; 573b3a5bbfdSBob Peterson 574b81171cbSBob Peterson read_lock_bh(&sk->sk_callback_lock); 575b81171cbSBob Peterson con = sock2con(sk); 576b81171cbSBob Peterson if (con == NULL) 577b81171cbSBob Peterson goto out; 578b81171cbSBob Peterson 579cc661fc9SBob Peterson orig_report = listen_sock.sk_error_report; 5801a31833dSBob Peterson if (con->sock == NULL || 5819b2c45d4SDenys Vlasenko kernel_getpeername(con->sock, (struct sockaddr *)&saddr) < 0) { 582b3a5bbfdSBob Peterson printk_ratelimited(KERN_ERR "dlm: node %d: socket error " 583b3a5bbfdSBob Peterson "sending to node %d, port %d, " 584b3a5bbfdSBob Peterson "sk_err=%d/%d\n", dlm_our_nodeid(), 585b3a5bbfdSBob Peterson con->nodeid, dlm_config.ci_tcp_port, 586b3a5bbfdSBob Peterson sk->sk_err, sk->sk_err_soft); 587b3a5bbfdSBob Peterson } else if (saddr.ss_family == AF_INET) { 588b3a5bbfdSBob Peterson struct sockaddr_in *sin4 = (struct sockaddr_in *)&saddr; 589b3a5bbfdSBob Peterson 590b3a5bbfdSBob Peterson printk_ratelimited(KERN_ERR "dlm: node %d: socket error " 591b3a5bbfdSBob Peterson "sending to node %d at %pI4, port %d, " 592b3a5bbfdSBob Peterson "sk_err=%d/%d\n", dlm_our_nodeid(), 593b3a5bbfdSBob Peterson con->nodeid, &sin4->sin_addr.s_addr, 594b3a5bbfdSBob Peterson dlm_config.ci_tcp_port, sk->sk_err, 595b3a5bbfdSBob Peterson sk->sk_err_soft); 596b3a5bbfdSBob Peterson } else { 597b3a5bbfdSBob Peterson struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&saddr; 598b3a5bbfdSBob Peterson 599b3a5bbfdSBob Peterson printk_ratelimited(KERN_ERR "dlm: node %d: socket error " 600b3a5bbfdSBob Peterson "sending to node %d at %u.%u.%u.%u, " 601b3a5bbfdSBob Peterson "port %d, sk_err=%d/%d\n", dlm_our_nodeid(), 602b3a5bbfdSBob Peterson con->nodeid, sin6->sin6_addr.s6_addr32[0], 603b3a5bbfdSBob Peterson sin6->sin6_addr.s6_addr32[1], 604b3a5bbfdSBob Peterson sin6->sin6_addr.s6_addr32[2], 605b3a5bbfdSBob Peterson sin6->sin6_addr.s6_addr32[3], 606b3a5bbfdSBob Peterson dlm_config.ci_tcp_port, sk->sk_err, 607b3a5bbfdSBob Peterson sk->sk_err_soft); 608b3a5bbfdSBob Peterson } 609ba868d9dSAlexander Aring 610ba868d9dSAlexander Aring /* below sendcon only handling */ 611ba868d9dSAlexander Aring if (test_bit(CF_IS_OTHERCON, &con->flags)) 612ba868d9dSAlexander Aring con = con->sendcon; 613ba868d9dSAlexander Aring 614ba868d9dSAlexander Aring switch (sk->sk_err) { 615ba868d9dSAlexander Aring case ECONNREFUSED: 616ba868d9dSAlexander Aring set_bit(CF_DELAY_CONNECT, &con->flags); 617ba868d9dSAlexander Aring break; 618ba868d9dSAlexander Aring default: 619ba868d9dSAlexander Aring break; 620ba868d9dSAlexander Aring } 621ba868d9dSAlexander Aring 622ba868d9dSAlexander Aring if (!test_and_set_bit(CF_RECONNECT, &con->flags)) 623ba868d9dSAlexander Aring queue_work(send_workqueue, &con->swork); 624ba868d9dSAlexander Aring 625b81171cbSBob Peterson out: 626b81171cbSBob Peterson read_unlock_bh(&sk->sk_callback_lock); 627b81171cbSBob Peterson if (orig_report) 628b81171cbSBob Peterson orig_report(sk); 629b81171cbSBob Peterson } 630b81171cbSBob Peterson 631b81171cbSBob Peterson /* Note: sk_callback_lock must be locked before calling this function. */ 632cc661fc9SBob Peterson static void save_listen_callbacks(struct socket *sock) 633b81171cbSBob Peterson { 634cc661fc9SBob Peterson struct sock *sk = sock->sk; 635cc661fc9SBob Peterson 636cc661fc9SBob Peterson listen_sock.sk_data_ready = sk->sk_data_ready; 637cc661fc9SBob Peterson listen_sock.sk_state_change = sk->sk_state_change; 638cc661fc9SBob Peterson listen_sock.sk_write_space = sk->sk_write_space; 639cc661fc9SBob Peterson listen_sock.sk_error_report = sk->sk_error_report; 640b81171cbSBob Peterson } 641b81171cbSBob Peterson 642cc661fc9SBob Peterson static void restore_callbacks(struct socket *sock) 643b81171cbSBob Peterson { 644cc661fc9SBob Peterson struct sock *sk = sock->sk; 645cc661fc9SBob Peterson 646b81171cbSBob Peterson write_lock_bh(&sk->sk_callback_lock); 647b81171cbSBob Peterson sk->sk_user_data = NULL; 648cc661fc9SBob Peterson sk->sk_data_ready = listen_sock.sk_data_ready; 649cc661fc9SBob Peterson sk->sk_state_change = listen_sock.sk_state_change; 650cc661fc9SBob Peterson sk->sk_write_space = listen_sock.sk_write_space; 651cc661fc9SBob Peterson sk->sk_error_report = listen_sock.sk_error_report; 652b81171cbSBob Peterson write_unlock_bh(&sk->sk_callback_lock); 653b3a5bbfdSBob Peterson } 654b3a5bbfdSBob Peterson 655d11ccd45SAlexander Aring static void add_listen_sock(struct socket *sock, struct listen_connection *con) 656d11ccd45SAlexander Aring { 657d11ccd45SAlexander Aring struct sock *sk = sock->sk; 658d11ccd45SAlexander Aring 659d11ccd45SAlexander Aring write_lock_bh(&sk->sk_callback_lock); 660d11ccd45SAlexander Aring save_listen_callbacks(sock); 661d11ccd45SAlexander Aring con->sock = sock; 662d11ccd45SAlexander Aring 663d11ccd45SAlexander Aring sk->sk_user_data = con; 664d11ccd45SAlexander Aring sk->sk_allocation = GFP_NOFS; 665d11ccd45SAlexander Aring /* Install a data_ready callback */ 666d11ccd45SAlexander Aring sk->sk_data_ready = lowcomms_listen_data_ready; 667d11ccd45SAlexander Aring write_unlock_bh(&sk->sk_callback_lock); 668d11ccd45SAlexander Aring } 669d11ccd45SAlexander Aring 6706ed7257bSPatrick Caulfield /* Make a socket active */ 671988419a9Stsutomu.owa@toshiba.co.jp static void add_sock(struct socket *sock, struct connection *con) 6726ed7257bSPatrick Caulfield { 673b81171cbSBob Peterson struct sock *sk = sock->sk; 674b81171cbSBob Peterson 675b81171cbSBob Peterson write_lock_bh(&sk->sk_callback_lock); 6766ed7257bSPatrick Caulfield con->sock = sock; 6776ed7257bSPatrick Caulfield 678b81171cbSBob Peterson sk->sk_user_data = con; 6796ed7257bSPatrick Caulfield /* Install a data_ready callback */ 680b81171cbSBob Peterson sk->sk_data_ready = lowcomms_data_ready; 681b81171cbSBob Peterson sk->sk_write_space = lowcomms_write_space; 682b81171cbSBob Peterson sk->sk_state_change = lowcomms_state_change; 683b81171cbSBob Peterson sk->sk_allocation = GFP_NOFS; 684b81171cbSBob Peterson sk->sk_error_report = lowcomms_error_report; 685b81171cbSBob Peterson write_unlock_bh(&sk->sk_callback_lock); 6866ed7257bSPatrick Caulfield } 6876ed7257bSPatrick Caulfield 6886ed7257bSPatrick Caulfield /* Add the port number to an IPv6 or 4 sockaddr and return the address 6896ed7257bSPatrick Caulfield length */ 6906ed7257bSPatrick Caulfield static void make_sockaddr(struct sockaddr_storage *saddr, uint16_t port, 6916ed7257bSPatrick Caulfield int *addr_len) 6926ed7257bSPatrick Caulfield { 6936ed7257bSPatrick Caulfield saddr->ss_family = dlm_local_addr[0]->ss_family; 6946ed7257bSPatrick Caulfield if (saddr->ss_family == AF_INET) { 6956ed7257bSPatrick Caulfield struct sockaddr_in *in4_addr = (struct sockaddr_in *)saddr; 6966ed7257bSPatrick Caulfield in4_addr->sin_port = cpu_to_be16(port); 6976ed7257bSPatrick Caulfield *addr_len = sizeof(struct sockaddr_in); 6986ed7257bSPatrick Caulfield memset(&in4_addr->sin_zero, 0, sizeof(in4_addr->sin_zero)); 6996ed7257bSPatrick Caulfield } else { 7006ed7257bSPatrick Caulfield struct sockaddr_in6 *in6_addr = (struct sockaddr_in6 *)saddr; 7016ed7257bSPatrick Caulfield in6_addr->sin6_port = cpu_to_be16(port); 7026ed7257bSPatrick Caulfield *addr_len = sizeof(struct sockaddr_in6); 7036ed7257bSPatrick Caulfield } 70401c8cab2SPatrick Caulfield memset((char *)saddr + *addr_len, 0, sizeof(struct sockaddr_storage) - *addr_len); 7056ed7257bSPatrick Caulfield } 7066ed7257bSPatrick Caulfield 707706474fbSAlexander Aring static void dlm_page_release(struct kref *kref) 708706474fbSAlexander Aring { 709706474fbSAlexander Aring struct writequeue_entry *e = container_of(kref, struct writequeue_entry, 710706474fbSAlexander Aring ref); 711706474fbSAlexander Aring 712706474fbSAlexander Aring __free_page(e->page); 713706474fbSAlexander Aring kfree(e); 714706474fbSAlexander Aring } 715706474fbSAlexander Aring 716706474fbSAlexander Aring static void dlm_msg_release(struct kref *kref) 717706474fbSAlexander Aring { 718706474fbSAlexander Aring struct dlm_msg *msg = container_of(kref, struct dlm_msg, ref); 719706474fbSAlexander Aring 720706474fbSAlexander Aring kref_put(&msg->entry->ref, dlm_page_release); 721706474fbSAlexander Aring kfree(msg); 722706474fbSAlexander Aring } 723706474fbSAlexander Aring 724706474fbSAlexander Aring static void free_entry(struct writequeue_entry *e) 725706474fbSAlexander Aring { 726706474fbSAlexander Aring struct dlm_msg *msg, *tmp; 727706474fbSAlexander Aring 728706474fbSAlexander Aring list_for_each_entry_safe(msg, tmp, &e->msgs, list) { 729706474fbSAlexander Aring if (msg->orig_msg) { 730706474fbSAlexander Aring msg->orig_msg->retransmit = false; 731706474fbSAlexander Aring kref_put(&msg->orig_msg->ref, dlm_msg_release); 732706474fbSAlexander Aring } 733706474fbSAlexander Aring 734706474fbSAlexander Aring list_del(&msg->list); 735706474fbSAlexander Aring kref_put(&msg->ref, dlm_msg_release); 736706474fbSAlexander Aring } 737706474fbSAlexander Aring 738706474fbSAlexander Aring list_del(&e->list); 739706474fbSAlexander Aring atomic_dec(&e->con->writequeue_cnt); 740706474fbSAlexander Aring kref_put(&e->ref, dlm_page_release); 741706474fbSAlexander Aring } 742706474fbSAlexander Aring 743d11ccd45SAlexander Aring static void dlm_close_sock(struct socket **sock) 744d11ccd45SAlexander Aring { 745d11ccd45SAlexander Aring if (*sock) { 746d11ccd45SAlexander Aring restore_callbacks(*sock); 747d11ccd45SAlexander Aring sock_release(*sock); 748d11ccd45SAlexander Aring *sock = NULL; 749d11ccd45SAlexander Aring } 750d11ccd45SAlexander Aring } 751d11ccd45SAlexander Aring 7526ed7257bSPatrick Caulfield /* Close a remote connection and tidy up */ 7530d737a8cSMarcelo Ricardo Leitner static void close_connection(struct connection *con, bool and_other, 7540d737a8cSMarcelo Ricardo Leitner bool tx, bool rx) 7556ed7257bSPatrick Caulfield { 756b2a66629Stsutomu.owa@toshiba.co.jp bool closing = test_and_set_bit(CF_CLOSING, &con->flags); 757706474fbSAlexander Aring struct writequeue_entry *e; 758b2a66629Stsutomu.owa@toshiba.co.jp 7590aa18464Stsutomu.owa@toshiba.co.jp if (tx && !closing && cancel_work_sync(&con->swork)) { 7600d737a8cSMarcelo Ricardo Leitner log_print("canceled swork for node %d", con->nodeid); 7610aa18464Stsutomu.owa@toshiba.co.jp clear_bit(CF_WRITE_PENDING, &con->flags); 7620aa18464Stsutomu.owa@toshiba.co.jp } 7630aa18464Stsutomu.owa@toshiba.co.jp if (rx && !closing && cancel_work_sync(&con->rwork)) { 7640d737a8cSMarcelo Ricardo Leitner log_print("canceled rwork for node %d", con->nodeid); 7650aa18464Stsutomu.owa@toshiba.co.jp clear_bit(CF_READ_PENDING, &con->flags); 7660aa18464Stsutomu.owa@toshiba.co.jp } 7676ed7257bSPatrick Caulfield 7680d737a8cSMarcelo Ricardo Leitner mutex_lock(&con->sock_mutex); 769d11ccd45SAlexander Aring dlm_close_sock(&con->sock); 770d11ccd45SAlexander Aring 7716ed7257bSPatrick Caulfield if (con->othercon && and_other) { 7726ed7257bSPatrick Caulfield /* Will only re-enter once. */ 773c6aa00e3SAlexander Aring close_connection(con->othercon, false, tx, rx); 7746ed7257bSPatrick Caulfield } 7759e5f2825SPatrick Caulfield 776706474fbSAlexander Aring /* if we send a writequeue entry only a half way, we drop the 777706474fbSAlexander Aring * whole entry because reconnection and that we not start of the 778706474fbSAlexander Aring * middle of a msg which will confuse the other end. 779706474fbSAlexander Aring * 780706474fbSAlexander Aring * we can always drop messages because retransmits, but what we 781706474fbSAlexander Aring * cannot allow is to transmit half messages which may be processed 782706474fbSAlexander Aring * at the other side. 783706474fbSAlexander Aring * 784706474fbSAlexander Aring * our policy is to start on a clean state when disconnects, we don't 785706474fbSAlexander Aring * know what's send/received on transport layer in this case. 786706474fbSAlexander Aring */ 787706474fbSAlexander Aring spin_lock(&con->writequeue_lock); 788706474fbSAlexander Aring if (!list_empty(&con->writequeue)) { 789706474fbSAlexander Aring e = list_first_entry(&con->writequeue, struct writequeue_entry, 790706474fbSAlexander Aring list); 791706474fbSAlexander Aring if (e->dirty) 792706474fbSAlexander Aring free_entry(e); 793706474fbSAlexander Aring } 794706474fbSAlexander Aring spin_unlock(&con->writequeue_lock); 795706474fbSAlexander Aring 7964798cbbfSAlexander Aring con->rx_leftover = 0; 7976ed7257bSPatrick Caulfield con->retries = 0; 79819633c7eSAlexander Aring clear_bit(CF_CONNECTED, &con->flags); 799ba868d9dSAlexander Aring clear_bit(CF_DELAY_CONNECT, &con->flags); 800ba868d9dSAlexander Aring clear_bit(CF_RECONNECT, &con->flags); 8018aa31cbfSAlexander Aring clear_bit(CF_EOF, &con->flags); 8026ed7257bSPatrick Caulfield mutex_unlock(&con->sock_mutex); 803b2a66629Stsutomu.owa@toshiba.co.jp clear_bit(CF_CLOSING, &con->flags); 8046ed7257bSPatrick Caulfield } 8056ed7257bSPatrick Caulfield 806055923bfSAlexander Aring static void shutdown_connection(struct connection *con) 807055923bfSAlexander Aring { 808055923bfSAlexander Aring int ret; 809055923bfSAlexander Aring 810eec054b5SAlexander Aring flush_work(&con->swork); 811055923bfSAlexander Aring 812055923bfSAlexander Aring mutex_lock(&con->sock_mutex); 813055923bfSAlexander Aring /* nothing to shutdown */ 814055923bfSAlexander Aring if (!con->sock) { 815055923bfSAlexander Aring mutex_unlock(&con->sock_mutex); 816055923bfSAlexander Aring return; 817055923bfSAlexander Aring } 818055923bfSAlexander Aring 819055923bfSAlexander Aring set_bit(CF_SHUTDOWN, &con->flags); 820055923bfSAlexander Aring ret = kernel_sock_shutdown(con->sock, SHUT_WR); 821055923bfSAlexander Aring mutex_unlock(&con->sock_mutex); 822055923bfSAlexander Aring if (ret) { 823055923bfSAlexander Aring log_print("Connection %p failed to shutdown: %d will force close", 824055923bfSAlexander Aring con, ret); 825055923bfSAlexander Aring goto force_close; 826055923bfSAlexander Aring } else { 827055923bfSAlexander Aring ret = wait_event_timeout(con->shutdown_wait, 828055923bfSAlexander Aring !test_bit(CF_SHUTDOWN, &con->flags), 829055923bfSAlexander Aring DLM_SHUTDOWN_WAIT_TIMEOUT); 830055923bfSAlexander Aring if (ret == 0) { 831055923bfSAlexander Aring log_print("Connection %p shutdown timed out, will force close", 832055923bfSAlexander Aring con); 833055923bfSAlexander Aring goto force_close; 834055923bfSAlexander Aring } 835055923bfSAlexander Aring } 836055923bfSAlexander Aring 837055923bfSAlexander Aring return; 838055923bfSAlexander Aring 839055923bfSAlexander Aring force_close: 840055923bfSAlexander Aring clear_bit(CF_SHUTDOWN, &con->flags); 841055923bfSAlexander Aring close_connection(con, false, true, true); 842055923bfSAlexander Aring } 843055923bfSAlexander Aring 844055923bfSAlexander Aring static void dlm_tcp_shutdown(struct connection *con) 845055923bfSAlexander Aring { 846055923bfSAlexander Aring if (con->othercon) 847055923bfSAlexander Aring shutdown_connection(con->othercon); 848055923bfSAlexander Aring shutdown_connection(con); 849055923bfSAlexander Aring } 850055923bfSAlexander Aring 8514798cbbfSAlexander Aring static int con_realloc_receive_buf(struct connection *con, int newlen) 8524798cbbfSAlexander Aring { 8534798cbbfSAlexander Aring unsigned char *newbuf; 8544798cbbfSAlexander Aring 8554798cbbfSAlexander Aring newbuf = kmalloc(newlen, GFP_NOFS); 8564798cbbfSAlexander Aring if (!newbuf) 8574798cbbfSAlexander Aring return -ENOMEM; 8584798cbbfSAlexander Aring 8594798cbbfSAlexander Aring /* copy any leftover from last receive */ 8604798cbbfSAlexander Aring if (con->rx_leftover) 8614798cbbfSAlexander Aring memmove(newbuf, con->rx_buf, con->rx_leftover); 8624798cbbfSAlexander Aring 8634798cbbfSAlexander Aring /* swap to new buffer space */ 8644798cbbfSAlexander Aring kfree(con->rx_buf); 8654798cbbfSAlexander Aring con->rx_buflen = newlen; 8664798cbbfSAlexander Aring con->rx_buf = newbuf; 8674798cbbfSAlexander Aring 8684798cbbfSAlexander Aring return 0; 8694798cbbfSAlexander Aring } 8704798cbbfSAlexander Aring 8716ed7257bSPatrick Caulfield /* Data received from remote end */ 8726ed7257bSPatrick Caulfield static int receive_from_sock(struct connection *con) 8736ed7257bSPatrick Caulfield { 8746ed7257bSPatrick Caulfield int call_again_soon = 0; 8754798cbbfSAlexander Aring struct msghdr msg; 8764798cbbfSAlexander Aring struct kvec iov; 8774798cbbfSAlexander Aring int ret, buflen; 8786ed7257bSPatrick Caulfield 8796ed7257bSPatrick Caulfield mutex_lock(&con->sock_mutex); 8806ed7257bSPatrick Caulfield 8816ed7257bSPatrick Caulfield if (con->sock == NULL) { 8826ed7257bSPatrick Caulfield ret = -EAGAIN; 8836ed7257bSPatrick Caulfield goto out_close; 8846ed7257bSPatrick Caulfield } 8854798cbbfSAlexander Aring 8864798cbbfSAlexander Aring /* realloc if we get new buffer size to read out */ 8874798cbbfSAlexander Aring buflen = dlm_config.ci_buffer_size; 8884798cbbfSAlexander Aring if (con->rx_buflen != buflen && con->rx_leftover <= buflen) { 8894798cbbfSAlexander Aring ret = con_realloc_receive_buf(con, buflen); 8904798cbbfSAlexander Aring if (ret < 0) 8916ed7257bSPatrick Caulfield goto out_resched; 8926ed7257bSPatrick Caulfield } 8936ed7257bSPatrick Caulfield 8944798cbbfSAlexander Aring /* calculate new buffer parameter regarding last receive and 8954798cbbfSAlexander Aring * possible leftover bytes 8966ed7257bSPatrick Caulfield */ 8974798cbbfSAlexander Aring iov.iov_base = con->rx_buf + con->rx_leftover; 8984798cbbfSAlexander Aring iov.iov_len = con->rx_buflen - con->rx_leftover; 8996ed7257bSPatrick Caulfield 9004798cbbfSAlexander Aring memset(&msg, 0, sizeof(msg)); 9014798cbbfSAlexander Aring msg.msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL; 9024798cbbfSAlexander Aring ret = kernel_recvmsg(con->sock, &msg, &iov, 1, iov.iov_len, 9034798cbbfSAlexander Aring msg.msg_flags); 9046ed7257bSPatrick Caulfield if (ret <= 0) 9056ed7257bSPatrick Caulfield goto out_close; 9064798cbbfSAlexander Aring else if (ret == iov.iov_len) 907ee44b4bcSMarcelo Ricardo Leitner call_again_soon = 1; 9086ed7257bSPatrick Caulfield 9094798cbbfSAlexander Aring /* new buflen according readed bytes and leftover from last receive */ 9104798cbbfSAlexander Aring buflen = ret + con->rx_leftover; 9114798cbbfSAlexander Aring ret = dlm_process_incoming_buffer(con->nodeid, con->rx_buf, buflen); 9124798cbbfSAlexander Aring if (ret < 0) 9134798cbbfSAlexander Aring goto out_close; 9146ed7257bSPatrick Caulfield 9154798cbbfSAlexander Aring /* calculate leftover bytes from process and put it into begin of 9164798cbbfSAlexander Aring * the receive buffer, so next receive we have the full message 9174798cbbfSAlexander Aring * at the start address of the receive buffer. 9184798cbbfSAlexander Aring */ 9194798cbbfSAlexander Aring con->rx_leftover = buflen - ret; 9204798cbbfSAlexander Aring if (con->rx_leftover) { 9214798cbbfSAlexander Aring memmove(con->rx_buf, con->rx_buf + ret, 9224798cbbfSAlexander Aring con->rx_leftover); 9234798cbbfSAlexander Aring call_again_soon = true; 9246ed7257bSPatrick Caulfield } 9256ed7257bSPatrick Caulfield 9266ed7257bSPatrick Caulfield if (call_again_soon) 9276ed7257bSPatrick Caulfield goto out_resched; 9284798cbbfSAlexander Aring 9296ed7257bSPatrick Caulfield mutex_unlock(&con->sock_mutex); 9306ed7257bSPatrick Caulfield return 0; 9316ed7257bSPatrick Caulfield 9326ed7257bSPatrick Caulfield out_resched: 9336ed7257bSPatrick Caulfield if (!test_and_set_bit(CF_READ_PENDING, &con->flags)) 9346ed7257bSPatrick Caulfield queue_work(recv_workqueue, &con->rwork); 9356ed7257bSPatrick Caulfield mutex_unlock(&con->sock_mutex); 9366ed7257bSPatrick Caulfield return -EAGAIN; 9376ed7257bSPatrick Caulfield 9386ed7257bSPatrick Caulfield out_close: 939055923bfSAlexander Aring if (ret == 0) { 940055923bfSAlexander Aring log_print("connection %p got EOF from %d", 941055923bfSAlexander Aring con, con->nodeid); 9428aa31cbfSAlexander Aring 9438aa31cbfSAlexander Aring if (con->eof_condition && con->eof_condition(con)) { 9448aa31cbfSAlexander Aring set_bit(CF_EOF, &con->flags); 9458aa31cbfSAlexander Aring mutex_unlock(&con->sock_mutex); 9468aa31cbfSAlexander Aring } else { 9478aa31cbfSAlexander Aring mutex_unlock(&con->sock_mutex); 9488aa31cbfSAlexander Aring close_connection(con, false, true, false); 9498aa31cbfSAlexander Aring 950055923bfSAlexander Aring /* handling for tcp shutdown */ 951055923bfSAlexander Aring clear_bit(CF_SHUTDOWN, &con->flags); 952055923bfSAlexander Aring wake_up(&con->shutdown_wait); 9538aa31cbfSAlexander Aring } 9548aa31cbfSAlexander Aring 955055923bfSAlexander Aring /* signal to breaking receive worker */ 956055923bfSAlexander Aring ret = -1; 9578aa31cbfSAlexander Aring } else { 9588aa31cbfSAlexander Aring mutex_unlock(&con->sock_mutex); 9596ed7257bSPatrick Caulfield } 9606ed7257bSPatrick Caulfield return ret; 9616ed7257bSPatrick Caulfield } 9626ed7257bSPatrick Caulfield 9636ed7257bSPatrick Caulfield /* Listening socket is busy, accept a connection */ 964d11ccd45SAlexander Aring static int accept_from_sock(struct listen_connection *con) 9656ed7257bSPatrick Caulfield { 9666ed7257bSPatrick Caulfield int result; 9676ed7257bSPatrick Caulfield struct sockaddr_storage peeraddr; 9686ed7257bSPatrick Caulfield struct socket *newsock; 969b38bc9c2SAlexander Aring int len, idx; 9706ed7257bSPatrick Caulfield int nodeid; 9716ed7257bSPatrick Caulfield struct connection *newcon; 9726ed7257bSPatrick Caulfield struct connection *addcon; 9733f78cd7dSAlexander Aring unsigned int mark; 9746ed7257bSPatrick Caulfield 975d11ccd45SAlexander Aring if (!con->sock) 9763421fb15Stsutomu.owa@toshiba.co.jp return -ENOTCONN; 9776ed7257bSPatrick Caulfield 9783421fb15Stsutomu.owa@toshiba.co.jp result = kernel_accept(con->sock, &newsock, O_NONBLOCK); 9796ed7257bSPatrick Caulfield if (result < 0) 9806ed7257bSPatrick Caulfield goto accept_err; 9816ed7257bSPatrick Caulfield 9826ed7257bSPatrick Caulfield /* Get the connected socket's peer */ 9836ed7257bSPatrick Caulfield memset(&peeraddr, 0, sizeof(peeraddr)); 9849b2c45d4SDenys Vlasenko len = newsock->ops->getname(newsock, (struct sockaddr *)&peeraddr, 2); 9859b2c45d4SDenys Vlasenko if (len < 0) { 9866ed7257bSPatrick Caulfield result = -ECONNABORTED; 9876ed7257bSPatrick Caulfield goto accept_err; 9886ed7257bSPatrick Caulfield } 9896ed7257bSPatrick Caulfield 9906ed7257bSPatrick Caulfield /* Get the new node's NODEID */ 9916ed7257bSPatrick Caulfield make_sockaddr(&peeraddr, 0, &len); 992e125fbebSAlexander Aring if (addr_to_nodeid(&peeraddr, &nodeid, &mark)) { 993bcaadf5cSMasatake YAMATO unsigned char *b=(unsigned char *)&peeraddr; 994617e82e1SDavid Teigland log_print("connect from non cluster node"); 995bcaadf5cSMasatake YAMATO print_hex_dump_bytes("ss: ", DUMP_PREFIX_NONE, 996bcaadf5cSMasatake YAMATO b, sizeof(struct sockaddr_storage)); 9976ed7257bSPatrick Caulfield sock_release(newsock); 9986ed7257bSPatrick Caulfield return -1; 9996ed7257bSPatrick Caulfield } 10006ed7257bSPatrick Caulfield 10016ed7257bSPatrick Caulfield log_print("got connection from %d", nodeid); 10026ed7257bSPatrick Caulfield 10036ed7257bSPatrick Caulfield /* Check to see if we already have a connection to this node. This 10046ed7257bSPatrick Caulfield * could happen if the two nodes initiate a connection at roughly 10056ed7257bSPatrick Caulfield * the same time and the connections cross on the wire. 10066ed7257bSPatrick Caulfield * In this case we store the incoming one in "othercon" 10076ed7257bSPatrick Caulfield */ 1008b38bc9c2SAlexander Aring idx = srcu_read_lock(&connections_srcu); 1009748285ccSDavid Teigland newcon = nodeid2con(nodeid, GFP_NOFS); 10106ed7257bSPatrick Caulfield if (!newcon) { 1011b38bc9c2SAlexander Aring srcu_read_unlock(&connections_srcu, idx); 10126ed7257bSPatrick Caulfield result = -ENOMEM; 10136ed7257bSPatrick Caulfield goto accept_err; 10146ed7257bSPatrick Caulfield } 1015d11ccd45SAlexander Aring 1016e125fbebSAlexander Aring sock_set_mark(newsock->sk, mark); 1017e125fbebSAlexander Aring 1018d11ccd45SAlexander Aring mutex_lock(&newcon->sock_mutex); 10196ed7257bSPatrick Caulfield if (newcon->sock) { 10206ed7257bSPatrick Caulfield struct connection *othercon = newcon->othercon; 10216ed7257bSPatrick Caulfield 10226ed7257bSPatrick Caulfield if (!othercon) { 1023a47666ebSAlexander Aring othercon = kzalloc(sizeof(*othercon), GFP_NOFS); 10246ed7257bSPatrick Caulfield if (!othercon) { 1025617e82e1SDavid Teigland log_print("failed to allocate incoming socket"); 10266ed7257bSPatrick Caulfield mutex_unlock(&newcon->sock_mutex); 1027b38bc9c2SAlexander Aring srcu_read_unlock(&connections_srcu, idx); 10286ed7257bSPatrick Caulfield result = -ENOMEM; 10296ed7257bSPatrick Caulfield goto accept_err; 10306ed7257bSPatrick Caulfield } 10314798cbbfSAlexander Aring 10326cde210aSAlexander Aring result = dlm_con_init(othercon, nodeid); 10336cde210aSAlexander Aring if (result < 0) { 10344798cbbfSAlexander Aring kfree(othercon); 10352fd8db2dSYang Yingliang mutex_unlock(&newcon->sock_mutex); 1036b38bc9c2SAlexander Aring srcu_read_unlock(&connections_srcu, idx); 10374798cbbfSAlexander Aring goto accept_err; 10384798cbbfSAlexander Aring } 10394798cbbfSAlexander Aring 1040e9a470acSAlexander Aring lockdep_set_subclass(&othercon->sock_mutex, 1); 10417443bc96SAlexander Aring set_bit(CF_IS_OTHERCON, &othercon->flags); 10426cde210aSAlexander Aring newcon->othercon = othercon; 1043ba868d9dSAlexander Aring othercon->sendcon = newcon; 1044ba3ab3caSAlexander Aring } else { 1045ba3ab3caSAlexander Aring /* close other sock con if we have something new */ 1046ba3ab3caSAlexander Aring close_connection(othercon, false, true, false); 104761d96be0SPatrick Caulfield } 1048ba3ab3caSAlexander Aring 1049e9a470acSAlexander Aring mutex_lock(&othercon->sock_mutex); 1050988419a9Stsutomu.owa@toshiba.co.jp add_sock(newsock, othercon); 10516ed7257bSPatrick Caulfield addcon = othercon; 1052c7355827Stsutomu.owa@toshiba.co.jp mutex_unlock(&othercon->sock_mutex); 10536ed7257bSPatrick Caulfield } 10546ed7257bSPatrick Caulfield else { 10553735b4b9SBob Peterson /* accept copies the sk after we've saved the callbacks, so we 10563735b4b9SBob Peterson don't want to save them a second time or comm errors will 10573735b4b9SBob Peterson result in calling sk_error_report recursively. */ 1058988419a9Stsutomu.owa@toshiba.co.jp add_sock(newsock, newcon); 10596ed7257bSPatrick Caulfield addcon = newcon; 10606ed7257bSPatrick Caulfield } 10616ed7257bSPatrick Caulfield 1062b30a624fSAlexander Aring set_bit(CF_CONNECTED, &addcon->flags); 10636ed7257bSPatrick Caulfield mutex_unlock(&newcon->sock_mutex); 10646ed7257bSPatrick Caulfield 10656ed7257bSPatrick Caulfield /* 10666ed7257bSPatrick Caulfield * Add it to the active queue in case we got data 106725985edcSLucas De Marchi * between processing the accept adding the socket 10686ed7257bSPatrick Caulfield * to the read_sockets list 10696ed7257bSPatrick Caulfield */ 10706ed7257bSPatrick Caulfield if (!test_and_set_bit(CF_READ_PENDING, &addcon->flags)) 10716ed7257bSPatrick Caulfield queue_work(recv_workqueue, &addcon->rwork); 10726ed7257bSPatrick Caulfield 1073b38bc9c2SAlexander Aring srcu_read_unlock(&connections_srcu, idx); 1074b38bc9c2SAlexander Aring 10756ed7257bSPatrick Caulfield return 0; 10766ed7257bSPatrick Caulfield 10776ed7257bSPatrick Caulfield accept_err: 10783421fb15Stsutomu.owa@toshiba.co.jp if (newsock) 10796ed7257bSPatrick Caulfield sock_release(newsock); 10806ed7257bSPatrick Caulfield 10816ed7257bSPatrick Caulfield if (result != -EAGAIN) 1082617e82e1SDavid Teigland log_print("error accepting connection from node: %d", result); 10836ed7257bSPatrick Caulfield return result; 10846ed7257bSPatrick Caulfield } 10856ed7257bSPatrick Caulfield 10865d689871SMike Christie /* 10875d689871SMike Christie * writequeue_entry_complete - try to delete and free write queue entry 10885d689871SMike Christie * @e: write queue entry to try to delete 10895d689871SMike Christie * @completed: bytes completed 10905d689871SMike Christie * 10915d689871SMike Christie * writequeue_lock must be held. 10925d689871SMike Christie */ 10935d689871SMike Christie static void writequeue_entry_complete(struct writequeue_entry *e, int completed) 10945d689871SMike Christie { 10955d689871SMike Christie e->offset += completed; 10965d689871SMike Christie e->len -= completed; 1097706474fbSAlexander Aring /* signal that page was half way transmitted */ 1098706474fbSAlexander Aring e->dirty = true; 10995d689871SMike Christie 11008f2dc78dSAlexander Aring if (e->len == 0 && e->users == 0) 11015d689871SMike Christie free_entry(e); 11025d689871SMike Christie } 11035d689871SMike Christie 1104ee44b4bcSMarcelo Ricardo Leitner /* 1105ee44b4bcSMarcelo Ricardo Leitner * sctp_bind_addrs - bind a SCTP socket to all our addresses 1106ee44b4bcSMarcelo Ricardo Leitner */ 110713004e8aSAlexander Aring static int sctp_bind_addrs(struct socket *sock, uint16_t port) 1108ee44b4bcSMarcelo Ricardo Leitner { 1109ee44b4bcSMarcelo Ricardo Leitner struct sockaddr_storage localaddr; 1110c0425a42SChristoph Hellwig struct sockaddr *addr = (struct sockaddr *)&localaddr; 1111ee44b4bcSMarcelo Ricardo Leitner int i, addr_len, result = 0; 1112ee44b4bcSMarcelo Ricardo Leitner 1113ee44b4bcSMarcelo Ricardo Leitner for (i = 0; i < dlm_local_count; i++) { 1114ee44b4bcSMarcelo Ricardo Leitner memcpy(&localaddr, dlm_local_addr[i], sizeof(localaddr)); 1115ee44b4bcSMarcelo Ricardo Leitner make_sockaddr(&localaddr, port, &addr_len); 1116ee44b4bcSMarcelo Ricardo Leitner 1117ee44b4bcSMarcelo Ricardo Leitner if (!i) 111813004e8aSAlexander Aring result = kernel_bind(sock, addr, addr_len); 1119ee44b4bcSMarcelo Ricardo Leitner else 112013004e8aSAlexander Aring result = sock_bind_add(sock->sk, addr, addr_len); 1121ee44b4bcSMarcelo Ricardo Leitner 1122ee44b4bcSMarcelo Ricardo Leitner if (result < 0) { 1123ee44b4bcSMarcelo Ricardo Leitner log_print("Can't bind to %d addr number %d, %d.\n", 1124ee44b4bcSMarcelo Ricardo Leitner port, i + 1, result); 1125ee44b4bcSMarcelo Ricardo Leitner break; 1126ee44b4bcSMarcelo Ricardo Leitner } 1127ee44b4bcSMarcelo Ricardo Leitner } 1128ee44b4bcSMarcelo Ricardo Leitner return result; 1129ee44b4bcSMarcelo Ricardo Leitner } 1130ee44b4bcSMarcelo Ricardo Leitner 11316ed7257bSPatrick Caulfield /* Initiate an SCTP association. 11326ed7257bSPatrick Caulfield This is a special case of send_to_sock() in that we don't yet have a 11336ed7257bSPatrick Caulfield peeled-off socket for this association, so we use the listening socket 11346ed7257bSPatrick Caulfield and add the primary IP address of the remote node. 11356ed7257bSPatrick Caulfield */ 1136ee44b4bcSMarcelo Ricardo Leitner static void sctp_connect_to_sock(struct connection *con) 11376ed7257bSPatrick Caulfield { 1138ee44b4bcSMarcelo Ricardo Leitner struct sockaddr_storage daddr; 1139ee44b4bcSMarcelo Ricardo Leitner int result; 1140ee44b4bcSMarcelo Ricardo Leitner int addr_len; 1141ee44b4bcSMarcelo Ricardo Leitner struct socket *sock; 11429c9f168fSAlexander Aring unsigned int mark; 1143ee44b4bcSMarcelo Ricardo Leitner 11445d689871SMike Christie mutex_lock(&con->sock_mutex); 11456ed7257bSPatrick Caulfield 1146ee44b4bcSMarcelo Ricardo Leitner /* Some odd races can cause double-connects, ignore them */ 1147ee44b4bcSMarcelo Ricardo Leitner if (con->retries++ > MAX_CONNECT_RETRIES) 1148ee44b4bcSMarcelo Ricardo Leitner goto out; 1149ee44b4bcSMarcelo Ricardo Leitner 1150ee44b4bcSMarcelo Ricardo Leitner if (con->sock) { 1151ee44b4bcSMarcelo Ricardo Leitner log_print("node %d already connected.", con->nodeid); 1152ee44b4bcSMarcelo Ricardo Leitner goto out; 1153ee44b4bcSMarcelo Ricardo Leitner } 1154ee44b4bcSMarcelo Ricardo Leitner 1155ee44b4bcSMarcelo Ricardo Leitner memset(&daddr, 0, sizeof(daddr)); 1156e125fbebSAlexander Aring result = nodeid_to_addr(con->nodeid, &daddr, NULL, true, &mark); 1157ee44b4bcSMarcelo Ricardo Leitner if (result < 0) { 11586ed7257bSPatrick Caulfield log_print("no address for nodeid %d", con->nodeid); 1159ee44b4bcSMarcelo Ricardo Leitner goto out; 116004bedd79SDavid Teigland } 11616ed7257bSPatrick Caulfield 1162ee44b4bcSMarcelo Ricardo Leitner /* Create a socket to communicate with */ 1163ee44b4bcSMarcelo Ricardo Leitner result = sock_create_kern(&init_net, dlm_local_addr[0]->ss_family, 1164ee44b4bcSMarcelo Ricardo Leitner SOCK_STREAM, IPPROTO_SCTP, &sock); 1165ee44b4bcSMarcelo Ricardo Leitner if (result < 0) 1166ee44b4bcSMarcelo Ricardo Leitner goto socket_err; 11676ed7257bSPatrick Caulfield 11689c9f168fSAlexander Aring sock_set_mark(sock->sk, mark); 11699c9f168fSAlexander Aring 1170988419a9Stsutomu.owa@toshiba.co.jp add_sock(sock, con); 11716ed7257bSPatrick Caulfield 1172ee44b4bcSMarcelo Ricardo Leitner /* Bind to all addresses. */ 117313004e8aSAlexander Aring if (sctp_bind_addrs(con->sock, 0)) 1174ee44b4bcSMarcelo Ricardo Leitner goto bind_err; 117598e1b60eSMike Christie 1176ee44b4bcSMarcelo Ricardo Leitner make_sockaddr(&daddr, dlm_config.ci_tcp_port, &addr_len); 11776ed7257bSPatrick Caulfield 11782df6b762SAlexander Aring log_print_ratelimited("connecting to %d", con->nodeid); 11796ed7257bSPatrick Caulfield 1180ee44b4bcSMarcelo Ricardo Leitner /* Turn off Nagle's algorithm */ 118140ef92c6SChristoph Hellwig sctp_sock_set_nodelay(sock->sk); 1182ee44b4bcSMarcelo Ricardo Leitner 1183f706d830SGang He /* 1184f706d830SGang He * Make sock->ops->connect() function return in specified time, 1185f706d830SGang He * since O_NONBLOCK argument in connect() function does not work here, 1186f706d830SGang He * then, we should restore the default value of this attribute. 1187f706d830SGang He */ 118876ee0785SChristoph Hellwig sock_set_sndtimeo(sock->sk, 5); 1189ee44b4bcSMarcelo Ricardo Leitner result = sock->ops->connect(sock, (struct sockaddr *)&daddr, addr_len, 1190da3627c3SGang He 0); 119176ee0785SChristoph Hellwig sock_set_sndtimeo(sock->sk, 0); 1192f706d830SGang He 1193ee44b4bcSMarcelo Ricardo Leitner if (result == -EINPROGRESS) 1194ee44b4bcSMarcelo Ricardo Leitner result = 0; 119519633c7eSAlexander Aring if (result == 0) { 119619633c7eSAlexander Aring if (!test_and_set_bit(CF_CONNECTED, &con->flags)) 119719633c7eSAlexander Aring log_print("successful connected to node %d", con->nodeid); 1198ee44b4bcSMarcelo Ricardo Leitner goto out; 119919633c7eSAlexander Aring } 1200ee44b4bcSMarcelo Ricardo Leitner 1201ee44b4bcSMarcelo Ricardo Leitner bind_err: 1202ee44b4bcSMarcelo Ricardo Leitner con->sock = NULL; 1203ee44b4bcSMarcelo Ricardo Leitner sock_release(sock); 1204ee44b4bcSMarcelo Ricardo Leitner 1205ee44b4bcSMarcelo Ricardo Leitner socket_err: 1206ee44b4bcSMarcelo Ricardo Leitner /* 1207ee44b4bcSMarcelo Ricardo Leitner * Some errors are fatal and this list might need adjusting. For other 1208ee44b4bcSMarcelo Ricardo Leitner * errors we try again until the max number of retries is reached. 1209ee44b4bcSMarcelo Ricardo Leitner */ 1210ee44b4bcSMarcelo Ricardo Leitner if (result != -EHOSTUNREACH && 1211ee44b4bcSMarcelo Ricardo Leitner result != -ENETUNREACH && 1212ee44b4bcSMarcelo Ricardo Leitner result != -ENETDOWN && 1213ee44b4bcSMarcelo Ricardo Leitner result != -EINVAL && 1214ee44b4bcSMarcelo Ricardo Leitner result != -EPROTONOSUPPORT) { 1215ee44b4bcSMarcelo Ricardo Leitner log_print("connect %d try %d error %d", con->nodeid, 1216ee44b4bcSMarcelo Ricardo Leitner con->retries, result); 1217ee44b4bcSMarcelo Ricardo Leitner mutex_unlock(&con->sock_mutex); 1218ee44b4bcSMarcelo Ricardo Leitner msleep(1000); 1219ee44b4bcSMarcelo Ricardo Leitner lowcomms_connect_sock(con); 1220ee44b4bcSMarcelo Ricardo Leitner return; 12216ed7257bSPatrick Caulfield } 12225d689871SMike Christie 1223ee44b4bcSMarcelo Ricardo Leitner out: 12245d689871SMike Christie mutex_unlock(&con->sock_mutex); 12256ed7257bSPatrick Caulfield } 12266ed7257bSPatrick Caulfield 12276ed7257bSPatrick Caulfield /* Connect a new socket to its peer */ 12286ed7257bSPatrick Caulfield static void tcp_connect_to_sock(struct connection *con) 12296ed7257bSPatrick Caulfield { 12306bd8fedaSLon Hohberger struct sockaddr_storage saddr, src_addr; 1231e125fbebSAlexander Aring unsigned int mark; 12326ed7257bSPatrick Caulfield int addr_len; 1233a89d63a1SCasey Dahlin struct socket *sock = NULL; 123436b71a8bSDavid Teigland int result; 12356ed7257bSPatrick Caulfield 12366ed7257bSPatrick Caulfield mutex_lock(&con->sock_mutex); 12376ed7257bSPatrick Caulfield if (con->retries++ > MAX_CONNECT_RETRIES) 12386ed7257bSPatrick Caulfield goto out; 12396ed7257bSPatrick Caulfield 12406ed7257bSPatrick Caulfield /* Some odd races can cause double-connects, ignore them */ 124136b71a8bSDavid Teigland if (con->sock) 12426ed7257bSPatrick Caulfield goto out; 12436ed7257bSPatrick Caulfield 12446ed7257bSPatrick Caulfield /* Create a socket to communicate with */ 1245eeb1bd5cSEric W. Biederman result = sock_create_kern(&init_net, dlm_local_addr[0]->ss_family, 1246eeb1bd5cSEric W. Biederman SOCK_STREAM, IPPROTO_TCP, &sock); 12476ed7257bSPatrick Caulfield if (result < 0) 12486ed7257bSPatrick Caulfield goto out_err; 12496ed7257bSPatrick Caulfield 12506ed7257bSPatrick Caulfield memset(&saddr, 0, sizeof(saddr)); 1251e125fbebSAlexander Aring result = nodeid_to_addr(con->nodeid, &saddr, NULL, false, &mark); 125236b71a8bSDavid Teigland if (result < 0) { 125336b71a8bSDavid Teigland log_print("no address for nodeid %d", con->nodeid); 12546ed7257bSPatrick Caulfield goto out_err; 125536b71a8bSDavid Teigland } 12566ed7257bSPatrick Caulfield 1257e125fbebSAlexander Aring sock_set_mark(sock->sk, mark); 1258e125fbebSAlexander Aring 1259988419a9Stsutomu.owa@toshiba.co.jp add_sock(sock, con); 12606ed7257bSPatrick Caulfield 12616bd8fedaSLon Hohberger /* Bind to our cluster-known address connecting to avoid 12626bd8fedaSLon Hohberger routing problems */ 12636bd8fedaSLon Hohberger memcpy(&src_addr, dlm_local_addr[0], sizeof(src_addr)); 12646bd8fedaSLon Hohberger make_sockaddr(&src_addr, 0, &addr_len); 12656bd8fedaSLon Hohberger result = sock->ops->bind(sock, (struct sockaddr *) &src_addr, 12666bd8fedaSLon Hohberger addr_len); 12676bd8fedaSLon Hohberger if (result < 0) { 12686bd8fedaSLon Hohberger log_print("could not bind for connect: %d", result); 12696bd8fedaSLon Hohberger /* This *may* not indicate a critical error */ 12706bd8fedaSLon Hohberger } 12716bd8fedaSLon Hohberger 12726ed7257bSPatrick Caulfield make_sockaddr(&saddr, dlm_config.ci_tcp_port, &addr_len); 12736ed7257bSPatrick Caulfield 12742df6b762SAlexander Aring log_print_ratelimited("connecting to %d", con->nodeid); 1275cb2d45daSDavid Teigland 1276cb2d45daSDavid Teigland /* Turn off Nagle's algorithm */ 127712abc5eeSChristoph Hellwig tcp_sock_set_nodelay(sock->sk); 1278cb2d45daSDavid Teigland 127936b71a8bSDavid Teigland result = sock->ops->connect(sock, (struct sockaddr *)&saddr, addr_len, 12806ed7257bSPatrick Caulfield O_NONBLOCK); 12816ed7257bSPatrick Caulfield if (result == -EINPROGRESS) 12826ed7257bSPatrick Caulfield result = 0; 12836ed7257bSPatrick Caulfield if (result == 0) 12846ed7257bSPatrick Caulfield goto out; 12856ed7257bSPatrick Caulfield 12866ed7257bSPatrick Caulfield out_err: 12876ed7257bSPatrick Caulfield if (con->sock) { 12886ed7257bSPatrick Caulfield sock_release(con->sock); 12896ed7257bSPatrick Caulfield con->sock = NULL; 1290a89d63a1SCasey Dahlin } else if (sock) { 1291a89d63a1SCasey Dahlin sock_release(sock); 12926ed7257bSPatrick Caulfield } 12936ed7257bSPatrick Caulfield /* 12946ed7257bSPatrick Caulfield * Some errors are fatal and this list might need adjusting. For other 12956ed7257bSPatrick Caulfield * errors we try again until the max number of retries is reached. 12966ed7257bSPatrick Caulfield */ 129736b71a8bSDavid Teigland if (result != -EHOSTUNREACH && 129836b71a8bSDavid Teigland result != -ENETUNREACH && 129936b71a8bSDavid Teigland result != -ENETDOWN && 130036b71a8bSDavid Teigland result != -EINVAL && 130136b71a8bSDavid Teigland result != -EPROTONOSUPPORT) { 130236b71a8bSDavid Teigland log_print("connect %d try %d error %d", con->nodeid, 130336b71a8bSDavid Teigland con->retries, result); 130436b71a8bSDavid Teigland mutex_unlock(&con->sock_mutex); 130536b71a8bSDavid Teigland msleep(1000); 13066ed7257bSPatrick Caulfield lowcomms_connect_sock(con); 130736b71a8bSDavid Teigland return; 13086ed7257bSPatrick Caulfield } 13096ed7257bSPatrick Caulfield out: 13106ed7257bSPatrick Caulfield mutex_unlock(&con->sock_mutex); 13116ed7257bSPatrick Caulfield return; 13126ed7257bSPatrick Caulfield } 13136ed7257bSPatrick Caulfield 1314d11ccd45SAlexander Aring /* On error caller must run dlm_close_sock() for the 1315d11ccd45SAlexander Aring * listen connection socket. 1316d11ccd45SAlexander Aring */ 1317d11ccd45SAlexander Aring static int tcp_create_listen_sock(struct listen_connection *con, 13186ed7257bSPatrick Caulfield struct sockaddr_storage *saddr) 13196ed7257bSPatrick Caulfield { 13206ed7257bSPatrick Caulfield struct socket *sock = NULL; 13216ed7257bSPatrick Caulfield int result = 0; 13226ed7257bSPatrick Caulfield int addr_len; 13236ed7257bSPatrick Caulfield 13246ed7257bSPatrick Caulfield if (dlm_local_addr[0]->ss_family == AF_INET) 13256ed7257bSPatrick Caulfield addr_len = sizeof(struct sockaddr_in); 13266ed7257bSPatrick Caulfield else 13276ed7257bSPatrick Caulfield addr_len = sizeof(struct sockaddr_in6); 13286ed7257bSPatrick Caulfield 13296ed7257bSPatrick Caulfield /* Create a socket to communicate with */ 1330eeb1bd5cSEric W. Biederman result = sock_create_kern(&init_net, dlm_local_addr[0]->ss_family, 1331eeb1bd5cSEric W. Biederman SOCK_STREAM, IPPROTO_TCP, &sock); 13326ed7257bSPatrick Caulfield if (result < 0) { 1333617e82e1SDavid Teigland log_print("Can't create listening comms socket"); 13346ed7257bSPatrick Caulfield goto create_out; 13356ed7257bSPatrick Caulfield } 13366ed7257bSPatrick Caulfield 1337a5b7ab63SAlexander Aring sock_set_mark(sock->sk, dlm_config.ci_mark); 1338a5b7ab63SAlexander Aring 1339cb2d45daSDavid Teigland /* Turn off Nagle's algorithm */ 134012abc5eeSChristoph Hellwig tcp_sock_set_nodelay(sock->sk); 1341cb2d45daSDavid Teigland 1342b58f0e8fSChristoph Hellwig sock_set_reuseaddr(sock->sk); 13436ed7257bSPatrick Caulfield 1344d11ccd45SAlexander Aring add_listen_sock(sock, con); 13456ed7257bSPatrick Caulfield 13466ed7257bSPatrick Caulfield /* Bind to our port */ 13476ed7257bSPatrick Caulfield make_sockaddr(saddr, dlm_config.ci_tcp_port, &addr_len); 13486ed7257bSPatrick Caulfield result = sock->ops->bind(sock, (struct sockaddr *) saddr, addr_len); 13496ed7257bSPatrick Caulfield if (result < 0) { 1350617e82e1SDavid Teigland log_print("Can't bind to port %d", dlm_config.ci_tcp_port); 13516ed7257bSPatrick Caulfield goto create_out; 13526ed7257bSPatrick Caulfield } 1353ce3d9544SChristoph Hellwig sock_set_keepalive(sock->sk); 13546ed7257bSPatrick Caulfield 13556ed7257bSPatrick Caulfield result = sock->ops->listen(sock, 5); 13566ed7257bSPatrick Caulfield if (result < 0) { 1357617e82e1SDavid Teigland log_print("Can't listen on port %d", dlm_config.ci_tcp_port); 13586ed7257bSPatrick Caulfield goto create_out; 13596ed7257bSPatrick Caulfield } 13606ed7257bSPatrick Caulfield 1361d11ccd45SAlexander Aring return 0; 1362d11ccd45SAlexander Aring 13636ed7257bSPatrick Caulfield create_out: 1364d11ccd45SAlexander Aring return result; 13656ed7257bSPatrick Caulfield } 13666ed7257bSPatrick Caulfield 13676ed7257bSPatrick Caulfield /* Get local addresses */ 13686ed7257bSPatrick Caulfield static void init_local(void) 13696ed7257bSPatrick Caulfield { 13706ed7257bSPatrick Caulfield struct sockaddr_storage sas, *addr; 13716ed7257bSPatrick Caulfield int i; 13726ed7257bSPatrick Caulfield 137330d3a237SPatrick Caulfield dlm_local_count = 0; 13741b189b88SDavid Teigland for (i = 0; i < DLM_MAX_ADDR_COUNT; i++) { 13756ed7257bSPatrick Caulfield if (dlm_our_addr(&sas, i)) 13766ed7257bSPatrick Caulfield break; 13776ed7257bSPatrick Caulfield 13785c93f56fSAmitoj Kaur Chawla addr = kmemdup(&sas, sizeof(*addr), GFP_NOFS); 13796ed7257bSPatrick Caulfield if (!addr) 13806ed7257bSPatrick Caulfield break; 13816ed7257bSPatrick Caulfield dlm_local_addr[dlm_local_count++] = addr; 13826ed7257bSPatrick Caulfield } 13836ed7257bSPatrick Caulfield } 13846ed7257bSPatrick Caulfield 1385043697f0SAlexander Aring static void deinit_local(void) 1386043697f0SAlexander Aring { 1387043697f0SAlexander Aring int i; 1388043697f0SAlexander Aring 1389043697f0SAlexander Aring for (i = 0; i < dlm_local_count; i++) 1390043697f0SAlexander Aring kfree(dlm_local_addr[i]); 1391043697f0SAlexander Aring } 1392043697f0SAlexander Aring 1393d11ccd45SAlexander Aring /* Initialise SCTP socket and bind to all interfaces 1394d11ccd45SAlexander Aring * On error caller must run dlm_close_sock() for the 1395d11ccd45SAlexander Aring * listen connection socket. 1396d11ccd45SAlexander Aring */ 1397d11ccd45SAlexander Aring static int sctp_listen_for_all(struct listen_connection *con) 13986ed7257bSPatrick Caulfield { 13996ed7257bSPatrick Caulfield struct socket *sock = NULL; 1400ee44b4bcSMarcelo Ricardo Leitner int result = -EINVAL; 14016ed7257bSPatrick Caulfield 14026ed7257bSPatrick Caulfield log_print("Using SCTP for communications"); 14036ed7257bSPatrick Caulfield 1404eeb1bd5cSEric W. Biederman result = sock_create_kern(&init_net, dlm_local_addr[0]->ss_family, 1405ee44b4bcSMarcelo Ricardo Leitner SOCK_STREAM, IPPROTO_SCTP, &sock); 14066ed7257bSPatrick Caulfield if (result < 0) { 14076ed7257bSPatrick Caulfield log_print("Can't create comms socket, check SCTP is loaded"); 14086ed7257bSPatrick Caulfield goto out; 14096ed7257bSPatrick Caulfield } 14106ed7257bSPatrick Caulfield 141126cfabf9SChristoph Hellwig sock_set_rcvbuf(sock->sk, NEEDED_RMEM); 1412a5b7ab63SAlexander Aring sock_set_mark(sock->sk, dlm_config.ci_mark); 141340ef92c6SChristoph Hellwig sctp_sock_set_nodelay(sock->sk); 141486e92ad2SMike Christie 1415d11ccd45SAlexander Aring add_listen_sock(sock, con); 1416b81171cbSBob Peterson 1417ee44b4bcSMarcelo Ricardo Leitner /* Bind to all addresses. */ 1418d11ccd45SAlexander Aring result = sctp_bind_addrs(con->sock, dlm_config.ci_tcp_port); 1419d11ccd45SAlexander Aring if (result < 0) 1420d11ccd45SAlexander Aring goto out; 14216ed7257bSPatrick Caulfield 14226ed7257bSPatrick Caulfield result = sock->ops->listen(sock, 5); 14236ed7257bSPatrick Caulfield if (result < 0) { 14246ed7257bSPatrick Caulfield log_print("Can't set socket listening"); 1425d11ccd45SAlexander Aring goto out; 14266ed7257bSPatrick Caulfield } 14276ed7257bSPatrick Caulfield 14286ed7257bSPatrick Caulfield return 0; 14296ed7257bSPatrick Caulfield 14306ed7257bSPatrick Caulfield out: 14316ed7257bSPatrick Caulfield return result; 14326ed7257bSPatrick Caulfield } 14336ed7257bSPatrick Caulfield 14346ed7257bSPatrick Caulfield static int tcp_listen_for_all(void) 14356ed7257bSPatrick Caulfield { 14366ed7257bSPatrick Caulfield /* We don't support multi-homed hosts */ 14371a26bfafSAlexander Aring if (dlm_local_count > 1) { 1438617e82e1SDavid Teigland log_print("TCP protocol can't handle multi-homed hosts, " 1439617e82e1SDavid Teigland "try SCTP"); 14406ed7257bSPatrick Caulfield return -EINVAL; 14416ed7257bSPatrick Caulfield } 14426ed7257bSPatrick Caulfield 14436ed7257bSPatrick Caulfield log_print("Using TCP for communications"); 14446ed7257bSPatrick Caulfield 1445d11ccd45SAlexander Aring return tcp_create_listen_sock(&listen_con, dlm_local_addr[0]); 14466ed7257bSPatrick Caulfield } 14476ed7257bSPatrick Caulfield 14486ed7257bSPatrick Caulfield 14496ed7257bSPatrick Caulfield 14506ed7257bSPatrick Caulfield static struct writequeue_entry *new_writequeue_entry(struct connection *con, 14516ed7257bSPatrick Caulfield gfp_t allocation) 14526ed7257bSPatrick Caulfield { 14536ed7257bSPatrick Caulfield struct writequeue_entry *entry; 14546ed7257bSPatrick Caulfield 1455f0747ebfSAlexander Aring entry = kzalloc(sizeof(*entry), allocation); 14566ed7257bSPatrick Caulfield if (!entry) 14576ed7257bSPatrick Caulfield return NULL; 14586ed7257bSPatrick Caulfield 1459e1a7cbceSAlexander Aring entry->page = alloc_page(allocation | __GFP_ZERO); 14606ed7257bSPatrick Caulfield if (!entry->page) { 14616ed7257bSPatrick Caulfield kfree(entry); 14626ed7257bSPatrick Caulfield return NULL; 14636ed7257bSPatrick Caulfield } 14646ed7257bSPatrick Caulfield 14656ed7257bSPatrick Caulfield entry->con = con; 1466f0747ebfSAlexander Aring entry->users = 1; 14678f2dc78dSAlexander Aring kref_init(&entry->ref); 14688f2dc78dSAlexander Aring INIT_LIST_HEAD(&entry->msgs); 14696ed7257bSPatrick Caulfield 14706ed7257bSPatrick Caulfield return entry; 14716ed7257bSPatrick Caulfield } 14726ed7257bSPatrick Caulfield 1473f0747ebfSAlexander Aring static struct writequeue_entry *new_wq_entry(struct connection *con, int len, 14748f2dc78dSAlexander Aring gfp_t allocation, char **ppc, 14758f2dc78dSAlexander Aring void (*cb)(struct dlm_mhandle *mh), 14768f2dc78dSAlexander Aring struct dlm_mhandle *mh) 1477f0747ebfSAlexander Aring { 1478f0747ebfSAlexander Aring struct writequeue_entry *e; 1479f0747ebfSAlexander Aring 1480f0747ebfSAlexander Aring spin_lock(&con->writequeue_lock); 1481f0747ebfSAlexander Aring if (!list_empty(&con->writequeue)) { 1482f0747ebfSAlexander Aring e = list_last_entry(&con->writequeue, struct writequeue_entry, list); 1483f0747ebfSAlexander Aring if (DLM_WQ_REMAIN_BYTES(e) >= len) { 14848f2dc78dSAlexander Aring kref_get(&e->ref); 14858f2dc78dSAlexander Aring 1486f0747ebfSAlexander Aring *ppc = page_address(e->page) + e->end; 14878f2dc78dSAlexander Aring if (cb) 14888f2dc78dSAlexander Aring cb(mh); 14898f2dc78dSAlexander Aring 1490f0747ebfSAlexander Aring e->end += len; 1491f0747ebfSAlexander Aring e->users++; 1492f0747ebfSAlexander Aring spin_unlock(&con->writequeue_lock); 1493f0747ebfSAlexander Aring 1494f0747ebfSAlexander Aring return e; 1495f0747ebfSAlexander Aring } 1496f0747ebfSAlexander Aring } 1497f0747ebfSAlexander Aring spin_unlock(&con->writequeue_lock); 1498f0747ebfSAlexander Aring 1499f0747ebfSAlexander Aring e = new_writequeue_entry(con, allocation); 1500f0747ebfSAlexander Aring if (!e) 1501f0747ebfSAlexander Aring return NULL; 1502f0747ebfSAlexander Aring 15038f2dc78dSAlexander Aring kref_get(&e->ref); 1504f0747ebfSAlexander Aring *ppc = page_address(e->page); 1505f0747ebfSAlexander Aring e->end += len; 15068aa31cbfSAlexander Aring atomic_inc(&con->writequeue_cnt); 1507f0747ebfSAlexander Aring 1508f0747ebfSAlexander Aring spin_lock(&con->writequeue_lock); 15098f2dc78dSAlexander Aring if (cb) 15108f2dc78dSAlexander Aring cb(mh); 15118f2dc78dSAlexander Aring 1512f0747ebfSAlexander Aring list_add_tail(&e->list, &con->writequeue); 1513f0747ebfSAlexander Aring spin_unlock(&con->writequeue_lock); 1514f0747ebfSAlexander Aring 1515f0747ebfSAlexander Aring return e; 1516f0747ebfSAlexander Aring }; 1517f0747ebfSAlexander Aring 15182874d1a6SAlexander Aring static struct dlm_msg *dlm_lowcomms_new_msg_con(struct connection *con, int len, 15192874d1a6SAlexander Aring gfp_t allocation, char **ppc, 15202874d1a6SAlexander Aring void (*cb)(struct dlm_mhandle *mh), 15212874d1a6SAlexander Aring struct dlm_mhandle *mh) 15222874d1a6SAlexander Aring { 15232874d1a6SAlexander Aring struct writequeue_entry *e; 15242874d1a6SAlexander Aring struct dlm_msg *msg; 15252874d1a6SAlexander Aring 15262874d1a6SAlexander Aring msg = kzalloc(sizeof(*msg), allocation); 15272874d1a6SAlexander Aring if (!msg) 15282874d1a6SAlexander Aring return NULL; 15292874d1a6SAlexander Aring 15302874d1a6SAlexander Aring kref_init(&msg->ref); 15312874d1a6SAlexander Aring 15322874d1a6SAlexander Aring e = new_wq_entry(con, len, allocation, ppc, cb, mh); 15332874d1a6SAlexander Aring if (!e) { 15342874d1a6SAlexander Aring kfree(msg); 15352874d1a6SAlexander Aring return NULL; 15362874d1a6SAlexander Aring } 15372874d1a6SAlexander Aring 15382874d1a6SAlexander Aring msg->ppc = *ppc; 15392874d1a6SAlexander Aring msg->len = len; 15402874d1a6SAlexander Aring msg->entry = e; 15412874d1a6SAlexander Aring 15422874d1a6SAlexander Aring return msg; 15432874d1a6SAlexander Aring } 15442874d1a6SAlexander Aring 15458f2dc78dSAlexander Aring struct dlm_msg *dlm_lowcomms_new_msg(int nodeid, int len, gfp_t allocation, 15468f2dc78dSAlexander Aring char **ppc, void (*cb)(struct dlm_mhandle *mh), 15478f2dc78dSAlexander Aring struct dlm_mhandle *mh) 15486ed7257bSPatrick Caulfield { 15496ed7257bSPatrick Caulfield struct connection *con; 15508f2dc78dSAlexander Aring struct dlm_msg *msg; 1551b38bc9c2SAlexander Aring int idx; 15526ed7257bSPatrick Caulfield 1553c45674fbSAlexander Aring if (len > DEFAULT_BUFFER_SIZE || 1554c45674fbSAlexander Aring len < sizeof(struct dlm_header)) { 1555c45674fbSAlexander Aring BUILD_BUG_ON(PAGE_SIZE < DEFAULT_BUFFER_SIZE); 1556692f51c8SAlexander Aring log_print("failed to allocate a buffer of size %d", len); 1557c45674fbSAlexander Aring WARN_ON(1); 1558692f51c8SAlexander Aring return NULL; 1559692f51c8SAlexander Aring } 1560692f51c8SAlexander Aring 1561b38bc9c2SAlexander Aring idx = srcu_read_lock(&connections_srcu); 15626ed7257bSPatrick Caulfield con = nodeid2con(nodeid, allocation); 1563b38bc9c2SAlexander Aring if (!con) { 1564b38bc9c2SAlexander Aring srcu_read_unlock(&connections_srcu, idx); 15656ed7257bSPatrick Caulfield return NULL; 1566b38bc9c2SAlexander Aring } 15676ed7257bSPatrick Caulfield 15682874d1a6SAlexander Aring msg = dlm_lowcomms_new_msg_con(con, len, allocation, ppc, cb, mh); 15698f2dc78dSAlexander Aring if (!msg) { 1570b38bc9c2SAlexander Aring srcu_read_unlock(&connections_srcu, idx); 1571b38bc9c2SAlexander Aring return NULL; 1572b38bc9c2SAlexander Aring } 1573b38bc9c2SAlexander Aring 15748f2dc78dSAlexander Aring /* we assume if successful commit must called */ 15758f2dc78dSAlexander Aring msg->idx = idx; 15768f2dc78dSAlexander Aring return msg; 15778f2dc78dSAlexander Aring } 15788f2dc78dSAlexander Aring 15792874d1a6SAlexander Aring static void _dlm_lowcomms_commit_msg(struct dlm_msg *msg) 15806ed7257bSPatrick Caulfield { 15818f2dc78dSAlexander Aring struct writequeue_entry *e = msg->entry; 15826ed7257bSPatrick Caulfield struct connection *con = e->con; 15836ed7257bSPatrick Caulfield int users; 15846ed7257bSPatrick Caulfield 15856ed7257bSPatrick Caulfield spin_lock(&con->writequeue_lock); 15868f2dc78dSAlexander Aring kref_get(&msg->ref); 15878f2dc78dSAlexander Aring list_add(&msg->list, &e->msgs); 15888f2dc78dSAlexander Aring 15896ed7257bSPatrick Caulfield users = --e->users; 15906ed7257bSPatrick Caulfield if (users) 15916ed7257bSPatrick Caulfield goto out; 1592f0747ebfSAlexander Aring 1593f0747ebfSAlexander Aring e->len = DLM_WQ_LENGTH_BYTES(e); 15946ed7257bSPatrick Caulfield spin_unlock(&con->writequeue_lock); 15956ed7257bSPatrick Caulfield 15966ed7257bSPatrick Caulfield queue_work(send_workqueue, &con->swork); 15976ed7257bSPatrick Caulfield return; 15986ed7257bSPatrick Caulfield 15996ed7257bSPatrick Caulfield out: 16006ed7257bSPatrick Caulfield spin_unlock(&con->writequeue_lock); 16016ed7257bSPatrick Caulfield return; 16026ed7257bSPatrick Caulfield } 16036ed7257bSPatrick Caulfield 16042874d1a6SAlexander Aring void dlm_lowcomms_commit_msg(struct dlm_msg *msg) 16052874d1a6SAlexander Aring { 16062874d1a6SAlexander Aring _dlm_lowcomms_commit_msg(msg); 16072874d1a6SAlexander Aring srcu_read_unlock(&connections_srcu, msg->idx); 16082874d1a6SAlexander Aring } 16092874d1a6SAlexander Aring 16108f2dc78dSAlexander Aring void dlm_lowcomms_put_msg(struct dlm_msg *msg) 16118f2dc78dSAlexander Aring { 16128f2dc78dSAlexander Aring kref_put(&msg->ref, dlm_msg_release); 16138f2dc78dSAlexander Aring } 16148f2dc78dSAlexander Aring 16152874d1a6SAlexander Aring /* does not held connections_srcu, usage workqueue only */ 16162874d1a6SAlexander Aring int dlm_lowcomms_resend_msg(struct dlm_msg *msg) 16172874d1a6SAlexander Aring { 16182874d1a6SAlexander Aring struct dlm_msg *msg_resend; 16192874d1a6SAlexander Aring char *ppc; 16202874d1a6SAlexander Aring 16212874d1a6SAlexander Aring if (msg->retransmit) 16222874d1a6SAlexander Aring return 1; 16232874d1a6SAlexander Aring 16242874d1a6SAlexander Aring msg_resend = dlm_lowcomms_new_msg_con(msg->entry->con, msg->len, 16252874d1a6SAlexander Aring GFP_ATOMIC, &ppc, NULL, NULL); 16262874d1a6SAlexander Aring if (!msg_resend) 16272874d1a6SAlexander Aring return -ENOMEM; 16282874d1a6SAlexander Aring 16292874d1a6SAlexander Aring msg->retransmit = true; 16302874d1a6SAlexander Aring kref_get(&msg->ref); 16312874d1a6SAlexander Aring msg_resend->orig_msg = msg; 16322874d1a6SAlexander Aring 16332874d1a6SAlexander Aring memcpy(ppc, msg->ppc, msg->len); 16342874d1a6SAlexander Aring _dlm_lowcomms_commit_msg(msg_resend); 16352874d1a6SAlexander Aring dlm_lowcomms_put_msg(msg_resend); 16362874d1a6SAlexander Aring 16372874d1a6SAlexander Aring return 0; 16382874d1a6SAlexander Aring } 16392874d1a6SAlexander Aring 16406ed7257bSPatrick Caulfield /* Send a message */ 16416ed7257bSPatrick Caulfield static void send_to_sock(struct connection *con) 16426ed7257bSPatrick Caulfield { 16436ed7257bSPatrick Caulfield int ret = 0; 16446ed7257bSPatrick Caulfield const int msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL; 16456ed7257bSPatrick Caulfield struct writequeue_entry *e; 16466ed7257bSPatrick Caulfield int len, offset; 1647f92c8dd7SBob Peterson int count = 0; 16486ed7257bSPatrick Caulfield 16496ed7257bSPatrick Caulfield mutex_lock(&con->sock_mutex); 16506ed7257bSPatrick Caulfield if (con->sock == NULL) 16516ed7257bSPatrick Caulfield goto out_connect; 16526ed7257bSPatrick Caulfield 16536ed7257bSPatrick Caulfield spin_lock(&con->writequeue_lock); 16546ed7257bSPatrick Caulfield for (;;) { 1655f0747ebfSAlexander Aring if (list_empty(&con->writequeue)) 16566ed7257bSPatrick Caulfield break; 16576ed7257bSPatrick Caulfield 1658f0747ebfSAlexander Aring e = list_first_entry(&con->writequeue, struct writequeue_entry, list); 16596ed7257bSPatrick Caulfield len = e->len; 16606ed7257bSPatrick Caulfield offset = e->offset; 16616ed7257bSPatrick Caulfield BUG_ON(len == 0 && e->users == 0); 16626ed7257bSPatrick Caulfield spin_unlock(&con->writequeue_lock); 16636ed7257bSPatrick Caulfield 16646ed7257bSPatrick Caulfield ret = 0; 16656ed7257bSPatrick Caulfield if (len) { 16661329e3f2SPaolo Bonzini ret = kernel_sendpage(con->sock, e->page, offset, len, 16676ed7257bSPatrick Caulfield msg_flags); 1668d66f8277SPatrick Caulfield if (ret == -EAGAIN || ret == 0) { 1669b36930ddSDavid Miller if (ret == -EAGAIN && 16709cd3e072SEric Dumazet test_bit(SOCKWQ_ASYNC_NOSPACE, &con->sock->flags) && 1671b36930ddSDavid Miller !test_and_set_bit(CF_APP_LIMITED, &con->flags)) { 1672b36930ddSDavid Miller /* Notify TCP that we're limited by the 1673b36930ddSDavid Miller * application window size. 1674b36930ddSDavid Miller */ 1675b36930ddSDavid Miller set_bit(SOCK_NOSPACE, &con->sock->flags); 1676b36930ddSDavid Miller con->sock->sk->sk_write_pending++; 1677b36930ddSDavid Miller } 1678d66f8277SPatrick Caulfield cond_resched(); 16796ed7257bSPatrick Caulfield goto out; 16809c5bef58SYing Xue } else if (ret < 0) 1681ba868d9dSAlexander Aring goto out; 1682d66f8277SPatrick Caulfield } 1683f92c8dd7SBob Peterson 16846ed7257bSPatrick Caulfield /* Don't starve people filling buffers */ 1685f92c8dd7SBob Peterson if (++count >= MAX_SEND_MSG_COUNT) { 16866ed7257bSPatrick Caulfield cond_resched(); 1687f92c8dd7SBob Peterson count = 0; 1688f92c8dd7SBob Peterson } 16896ed7257bSPatrick Caulfield 16906ed7257bSPatrick Caulfield spin_lock(&con->writequeue_lock); 16915d689871SMike Christie writequeue_entry_complete(e, ret); 16926ed7257bSPatrick Caulfield } 16936ed7257bSPatrick Caulfield spin_unlock(&con->writequeue_lock); 16948aa31cbfSAlexander Aring 16958aa31cbfSAlexander Aring /* close if we got EOF */ 16968aa31cbfSAlexander Aring if (test_and_clear_bit(CF_EOF, &con->flags)) { 16978aa31cbfSAlexander Aring mutex_unlock(&con->sock_mutex); 16988aa31cbfSAlexander Aring close_connection(con, false, false, true); 16998aa31cbfSAlexander Aring 17008aa31cbfSAlexander Aring /* handling for tcp shutdown */ 17018aa31cbfSAlexander Aring clear_bit(CF_SHUTDOWN, &con->flags); 17028aa31cbfSAlexander Aring wake_up(&con->shutdown_wait); 17038aa31cbfSAlexander Aring } else { 17048aa31cbfSAlexander Aring mutex_unlock(&con->sock_mutex); 17058aa31cbfSAlexander Aring } 17068aa31cbfSAlexander Aring 17078aa31cbfSAlexander Aring return; 17088aa31cbfSAlexander Aring 17096ed7257bSPatrick Caulfield out: 17106ed7257bSPatrick Caulfield mutex_unlock(&con->sock_mutex); 17116ed7257bSPatrick Caulfield return; 17126ed7257bSPatrick Caulfield 17136ed7257bSPatrick Caulfield out_connect: 17146ed7257bSPatrick Caulfield mutex_unlock(&con->sock_mutex); 171501da24d3SBob Peterson queue_work(send_workqueue, &con->swork); 171601da24d3SBob Peterson cond_resched(); 17176ed7257bSPatrick Caulfield } 17186ed7257bSPatrick Caulfield 17196ed7257bSPatrick Caulfield static void clean_one_writequeue(struct connection *con) 17206ed7257bSPatrick Caulfield { 17215e9ccc37SChristine Caulfield struct writequeue_entry *e, *safe; 17226ed7257bSPatrick Caulfield 17236ed7257bSPatrick Caulfield spin_lock(&con->writequeue_lock); 17245e9ccc37SChristine Caulfield list_for_each_entry_safe(e, safe, &con->writequeue, list) { 17256ed7257bSPatrick Caulfield free_entry(e); 17266ed7257bSPatrick Caulfield } 17276ed7257bSPatrick Caulfield spin_unlock(&con->writequeue_lock); 17286ed7257bSPatrick Caulfield } 17296ed7257bSPatrick Caulfield 17306ed7257bSPatrick Caulfield /* Called from recovery when it knows that a node has 17316ed7257bSPatrick Caulfield left the cluster */ 17326ed7257bSPatrick Caulfield int dlm_lowcomms_close(int nodeid) 17336ed7257bSPatrick Caulfield { 17346ed7257bSPatrick Caulfield struct connection *con; 173536b71a8bSDavid Teigland struct dlm_node_addr *na; 1736b38bc9c2SAlexander Aring int idx; 17376ed7257bSPatrick Caulfield 17386ed7257bSPatrick Caulfield log_print("closing connection to node %d", nodeid); 1739b38bc9c2SAlexander Aring idx = srcu_read_lock(&connections_srcu); 17406ed7257bSPatrick Caulfield con = nodeid2con(nodeid, 0); 17416ed7257bSPatrick Caulfield if (con) { 1742063c4c99SLars Marowsky-Bree set_bit(CF_CLOSE, &con->flags); 17430d737a8cSMarcelo Ricardo Leitner close_connection(con, true, true, true); 17446ed7257bSPatrick Caulfield clean_one_writequeue(con); 174553a5edaaSAlexander Aring if (con->othercon) 174653a5edaaSAlexander Aring clean_one_writequeue(con->othercon); 17476ed7257bSPatrick Caulfield } 1748b38bc9c2SAlexander Aring srcu_read_unlock(&connections_srcu, idx); 174936b71a8bSDavid Teigland 175036b71a8bSDavid Teigland spin_lock(&dlm_node_addrs_spin); 175136b71a8bSDavid Teigland na = find_node_addr(nodeid); 175236b71a8bSDavid Teigland if (na) { 175336b71a8bSDavid Teigland list_del(&na->list); 175436b71a8bSDavid Teigland while (na->addr_count--) 175536b71a8bSDavid Teigland kfree(na->addr[na->addr_count]); 175636b71a8bSDavid Teigland kfree(na); 175736b71a8bSDavid Teigland } 175836b71a8bSDavid Teigland spin_unlock(&dlm_node_addrs_spin); 175936b71a8bSDavid Teigland 17606ed7257bSPatrick Caulfield return 0; 17616ed7257bSPatrick Caulfield } 17626ed7257bSPatrick Caulfield 17636ed7257bSPatrick Caulfield /* Receive workqueue function */ 17646ed7257bSPatrick Caulfield static void process_recv_sockets(struct work_struct *work) 17656ed7257bSPatrick Caulfield { 17666ed7257bSPatrick Caulfield struct connection *con = container_of(work, struct connection, rwork); 17676ed7257bSPatrick Caulfield int err; 17686ed7257bSPatrick Caulfield 17696ed7257bSPatrick Caulfield clear_bit(CF_READ_PENDING, &con->flags); 17706ed7257bSPatrick Caulfield do { 1771d11ccd45SAlexander Aring err = receive_from_sock(con); 17726ed7257bSPatrick Caulfield } while (!err); 17736ed7257bSPatrick Caulfield } 17746ed7257bSPatrick Caulfield 1775d11ccd45SAlexander Aring static void process_listen_recv_socket(struct work_struct *work) 1776d11ccd45SAlexander Aring { 1777d11ccd45SAlexander Aring accept_from_sock(&listen_con); 1778d11ccd45SAlexander Aring } 1779d11ccd45SAlexander Aring 17806ed7257bSPatrick Caulfield /* Send workqueue function */ 17816ed7257bSPatrick Caulfield static void process_send_sockets(struct work_struct *work) 17826ed7257bSPatrick Caulfield { 17836ed7257bSPatrick Caulfield struct connection *con = container_of(work, struct connection, swork); 17846ed7257bSPatrick Caulfield 17857443bc96SAlexander Aring WARN_ON(test_bit(CF_IS_OTHERCON, &con->flags)); 17867443bc96SAlexander Aring 17878a4abb08Stsutomu.owa@toshiba.co.jp clear_bit(CF_WRITE_PENDING, &con->flags); 1788ba868d9dSAlexander Aring 1789489d8e55SAlexander Aring if (test_and_clear_bit(CF_RECONNECT, &con->flags)) { 1790ba868d9dSAlexander Aring close_connection(con, false, false, true); 1791489d8e55SAlexander Aring dlm_midcomms_unack_msg_resend(con->nodeid); 1792489d8e55SAlexander Aring } 1793ba868d9dSAlexander Aring 1794ba868d9dSAlexander Aring if (con->sock == NULL) { /* not mutex protected so check it inside too */ 1795ba868d9dSAlexander Aring if (test_and_clear_bit(CF_DELAY_CONNECT, &con->flags)) 1796ba868d9dSAlexander Aring msleep(1000); 17976ed7257bSPatrick Caulfield con->connect_action(con); 1798ba868d9dSAlexander Aring } 179901da24d3SBob Peterson if (!list_empty(&con->writequeue)) 18006ed7257bSPatrick Caulfield send_to_sock(con); 18016ed7257bSPatrick Caulfield } 18026ed7257bSPatrick Caulfield 18036ed7257bSPatrick Caulfield static void work_stop(void) 18046ed7257bSPatrick Caulfield { 1805fcef0e6cSAlexander Aring if (recv_workqueue) { 18066ed7257bSPatrick Caulfield destroy_workqueue(recv_workqueue); 1807fcef0e6cSAlexander Aring recv_workqueue = NULL; 1808fcef0e6cSAlexander Aring } 1809fcef0e6cSAlexander Aring 1810fcef0e6cSAlexander Aring if (send_workqueue) { 18116ed7257bSPatrick Caulfield destroy_workqueue(send_workqueue); 1812fcef0e6cSAlexander Aring send_workqueue = NULL; 1813fcef0e6cSAlexander Aring } 18146ed7257bSPatrick Caulfield } 18156ed7257bSPatrick Caulfield 18166ed7257bSPatrick Caulfield static int work_start(void) 18176ed7257bSPatrick Caulfield { 18186c6a1cc6SAlexander Aring recv_workqueue = alloc_ordered_workqueue("dlm_recv", WQ_MEM_RECLAIM); 1819b9d41052SNamhyung Kim if (!recv_workqueue) { 1820b9d41052SNamhyung Kim log_print("can't start dlm_recv"); 1821b9d41052SNamhyung Kim return -ENOMEM; 18226ed7257bSPatrick Caulfield } 18236ed7257bSPatrick Caulfield 18246c6a1cc6SAlexander Aring send_workqueue = alloc_ordered_workqueue("dlm_send", WQ_MEM_RECLAIM); 1825b9d41052SNamhyung Kim if (!send_workqueue) { 1826b9d41052SNamhyung Kim log_print("can't start dlm_send"); 18276ed7257bSPatrick Caulfield destroy_workqueue(recv_workqueue); 1828fcef0e6cSAlexander Aring recv_workqueue = NULL; 1829b9d41052SNamhyung Kim return -ENOMEM; 18306ed7257bSPatrick Caulfield } 18316ed7257bSPatrick Caulfield 18326ed7257bSPatrick Caulfield return 0; 18336ed7257bSPatrick Caulfield } 18346ed7257bSPatrick Caulfield 18359d232469SAlexander Aring static void shutdown_conn(struct connection *con) 18369d232469SAlexander Aring { 18379d232469SAlexander Aring if (con->shutdown_action) 18389d232469SAlexander Aring con->shutdown_action(con); 18399d232469SAlexander Aring } 18409d232469SAlexander Aring 18419d232469SAlexander Aring void dlm_lowcomms_shutdown(void) 18429d232469SAlexander Aring { 1843b38bc9c2SAlexander Aring int idx; 1844b38bc9c2SAlexander Aring 18459d232469SAlexander Aring /* Set all the flags to prevent any 18469d232469SAlexander Aring * socket activity. 18479d232469SAlexander Aring */ 18489d232469SAlexander Aring dlm_allow_conn = 0; 18499d232469SAlexander Aring 18509d232469SAlexander Aring if (recv_workqueue) 18519d232469SAlexander Aring flush_workqueue(recv_workqueue); 18529d232469SAlexander Aring if (send_workqueue) 18539d232469SAlexander Aring flush_workqueue(send_workqueue); 18549d232469SAlexander Aring 18559d232469SAlexander Aring dlm_close_sock(&listen_con.sock); 18569d232469SAlexander Aring 1857b38bc9c2SAlexander Aring idx = srcu_read_lock(&connections_srcu); 18589d232469SAlexander Aring foreach_conn(shutdown_conn); 1859b38bc9c2SAlexander Aring srcu_read_unlock(&connections_srcu, idx); 18609d232469SAlexander Aring } 18619d232469SAlexander Aring 1862f0fb83cbStsutomu.owa@toshiba.co.jp static void _stop_conn(struct connection *con, bool and_other) 18636ed7257bSPatrick Caulfield { 1864f0fb83cbStsutomu.owa@toshiba.co.jp mutex_lock(&con->sock_mutex); 1865173a31feStsutomu.owa@toshiba.co.jp set_bit(CF_CLOSE, &con->flags); 1866f0fb83cbStsutomu.owa@toshiba.co.jp set_bit(CF_READ_PENDING, &con->flags); 18678a4abb08Stsutomu.owa@toshiba.co.jp set_bit(CF_WRITE_PENDING, &con->flags); 186893eaadebStsutomu.owa@toshiba.co.jp if (con->sock && con->sock->sk) { 186993eaadebStsutomu.owa@toshiba.co.jp write_lock_bh(&con->sock->sk->sk_callback_lock); 1870afb853fbSPatrick Caulfield con->sock->sk->sk_user_data = NULL; 187193eaadebStsutomu.owa@toshiba.co.jp write_unlock_bh(&con->sock->sk->sk_callback_lock); 187293eaadebStsutomu.owa@toshiba.co.jp } 1873f0fb83cbStsutomu.owa@toshiba.co.jp if (con->othercon && and_other) 1874f0fb83cbStsutomu.owa@toshiba.co.jp _stop_conn(con->othercon, false); 1875f0fb83cbStsutomu.owa@toshiba.co.jp mutex_unlock(&con->sock_mutex); 1876f0fb83cbStsutomu.owa@toshiba.co.jp } 1877f0fb83cbStsutomu.owa@toshiba.co.jp 1878f0fb83cbStsutomu.owa@toshiba.co.jp static void stop_conn(struct connection *con) 1879f0fb83cbStsutomu.owa@toshiba.co.jp { 1880f0fb83cbStsutomu.owa@toshiba.co.jp _stop_conn(con, true); 1881afb853fbSPatrick Caulfield } 18825e9ccc37SChristine Caulfield 18834798cbbfSAlexander Aring static void connection_release(struct rcu_head *rcu) 18844798cbbfSAlexander Aring { 18854798cbbfSAlexander Aring struct connection *con = container_of(rcu, struct connection, rcu); 18864798cbbfSAlexander Aring 18874798cbbfSAlexander Aring kfree(con->rx_buf); 18884798cbbfSAlexander Aring kfree(con); 18894798cbbfSAlexander Aring } 18904798cbbfSAlexander Aring 18915e9ccc37SChristine Caulfield static void free_conn(struct connection *con) 18925e9ccc37SChristine Caulfield { 18930d737a8cSMarcelo Ricardo Leitner close_connection(con, true, true, true); 1894a47666ebSAlexander Aring spin_lock(&connections_lock); 1895a47666ebSAlexander Aring hlist_del_rcu(&con->list); 1896a47666ebSAlexander Aring spin_unlock(&connections_lock); 1897948c47e9SAlexander Aring if (con->othercon) { 1898948c47e9SAlexander Aring clean_one_writequeue(con->othercon); 18995cbec208SAlexander Aring call_srcu(&connections_srcu, &con->othercon->rcu, 19005cbec208SAlexander Aring connection_release); 1901948c47e9SAlexander Aring } 19020de98432SAlexander Aring clean_one_writequeue(con); 19035cbec208SAlexander Aring call_srcu(&connections_srcu, &con->rcu, connection_release); 19046ed7257bSPatrick Caulfield } 19055e9ccc37SChristine Caulfield 1906f0fb83cbStsutomu.owa@toshiba.co.jp static void work_flush(void) 1907f0fb83cbStsutomu.owa@toshiba.co.jp { 1908b38bc9c2SAlexander Aring int ok; 1909f0fb83cbStsutomu.owa@toshiba.co.jp int i; 1910f0fb83cbStsutomu.owa@toshiba.co.jp struct connection *con; 1911f0fb83cbStsutomu.owa@toshiba.co.jp 1912f0fb83cbStsutomu.owa@toshiba.co.jp do { 1913f0fb83cbStsutomu.owa@toshiba.co.jp ok = 1; 1914f0fb83cbStsutomu.owa@toshiba.co.jp foreach_conn(stop_conn); 1915b355516fSDavid Windsor if (recv_workqueue) 1916f0fb83cbStsutomu.owa@toshiba.co.jp flush_workqueue(recv_workqueue); 1917b355516fSDavid Windsor if (send_workqueue) 1918f0fb83cbStsutomu.owa@toshiba.co.jp flush_workqueue(send_workqueue); 1919f0fb83cbStsutomu.owa@toshiba.co.jp for (i = 0; i < CONN_HASH_SIZE && ok; i++) { 1920a47666ebSAlexander Aring hlist_for_each_entry_rcu(con, &connection_hash[i], 1921a47666ebSAlexander Aring list) { 1922f0fb83cbStsutomu.owa@toshiba.co.jp ok &= test_bit(CF_READ_PENDING, &con->flags); 19238a4abb08Stsutomu.owa@toshiba.co.jp ok &= test_bit(CF_WRITE_PENDING, &con->flags); 19248a4abb08Stsutomu.owa@toshiba.co.jp if (con->othercon) { 1925f0fb83cbStsutomu.owa@toshiba.co.jp ok &= test_bit(CF_READ_PENDING, 1926f0fb83cbStsutomu.owa@toshiba.co.jp &con->othercon->flags); 19278a4abb08Stsutomu.owa@toshiba.co.jp ok &= test_bit(CF_WRITE_PENDING, 19288a4abb08Stsutomu.owa@toshiba.co.jp &con->othercon->flags); 19298a4abb08Stsutomu.owa@toshiba.co.jp } 1930f0fb83cbStsutomu.owa@toshiba.co.jp } 1931f0fb83cbStsutomu.owa@toshiba.co.jp } 1932f0fb83cbStsutomu.owa@toshiba.co.jp } while (!ok); 1933f0fb83cbStsutomu.owa@toshiba.co.jp } 1934f0fb83cbStsutomu.owa@toshiba.co.jp 19355e9ccc37SChristine Caulfield void dlm_lowcomms_stop(void) 19365e9ccc37SChristine Caulfield { 1937b38bc9c2SAlexander Aring int idx; 1938b38bc9c2SAlexander Aring 1939b38bc9c2SAlexander Aring idx = srcu_read_lock(&connections_srcu); 1940f0fb83cbStsutomu.owa@toshiba.co.jp work_flush(); 19413a8db798SMarcelo Ricardo Leitner foreach_conn(free_conn); 1942b38bc9c2SAlexander Aring srcu_read_unlock(&connections_srcu, idx); 19436ed7257bSPatrick Caulfield work_stop(); 1944043697f0SAlexander Aring deinit_local(); 19456ed7257bSPatrick Caulfield } 19466ed7257bSPatrick Caulfield 19476ed7257bSPatrick Caulfield int dlm_lowcomms_start(void) 19486ed7257bSPatrick Caulfield { 19496ed7257bSPatrick Caulfield int error = -EINVAL; 19505e9ccc37SChristine Caulfield int i; 19515e9ccc37SChristine Caulfield 19525e9ccc37SChristine Caulfield for (i = 0; i < CONN_HASH_SIZE; i++) 19535e9ccc37SChristine Caulfield INIT_HLIST_HEAD(&connection_hash[i]); 19546ed7257bSPatrick Caulfield 19556ed7257bSPatrick Caulfield init_local(); 19566ed7257bSPatrick Caulfield if (!dlm_local_count) { 1957617e82e1SDavid Teigland error = -ENOTCONN; 19586ed7257bSPatrick Caulfield log_print("no local IP address has been set"); 1959513ef596SDavid Teigland goto fail; 19606ed7257bSPatrick Caulfield } 19616ed7257bSPatrick Caulfield 1962d11ccd45SAlexander Aring INIT_WORK(&listen_con.rwork, process_listen_recv_socket); 1963d11ccd45SAlexander Aring 1964513ef596SDavid Teigland error = work_start(); 1965513ef596SDavid Teigland if (error) 1966fcef0e6cSAlexander Aring goto fail_local; 1967513ef596SDavid Teigland 1968513ef596SDavid Teigland dlm_allow_conn = 1; 19696ed7257bSPatrick Caulfield 19706ed7257bSPatrick Caulfield /* Start listening */ 19716ed7257bSPatrick Caulfield if (dlm_config.ci_protocol == 0) 19726ed7257bSPatrick Caulfield error = tcp_listen_for_all(); 19736ed7257bSPatrick Caulfield else 1974d11ccd45SAlexander Aring error = sctp_listen_for_all(&listen_con); 19756ed7257bSPatrick Caulfield if (error) 19766ed7257bSPatrick Caulfield goto fail_unlisten; 19776ed7257bSPatrick Caulfield 19786ed7257bSPatrick Caulfield return 0; 19796ed7257bSPatrick Caulfield 19806ed7257bSPatrick Caulfield fail_unlisten: 1981513ef596SDavid Teigland dlm_allow_conn = 0; 1982d11ccd45SAlexander Aring dlm_close_sock(&listen_con.sock); 1983fcef0e6cSAlexander Aring work_stop(); 1984fcef0e6cSAlexander Aring fail_local: 1985fcef0e6cSAlexander Aring deinit_local(); 1986513ef596SDavid Teigland fail: 19876ed7257bSPatrick Caulfield return error; 19886ed7257bSPatrick Caulfield } 198936b71a8bSDavid Teigland 199036b71a8bSDavid Teigland void dlm_lowcomms_exit(void) 199136b71a8bSDavid Teigland { 199236b71a8bSDavid Teigland struct dlm_node_addr *na, *safe; 199336b71a8bSDavid Teigland 199436b71a8bSDavid Teigland spin_lock(&dlm_node_addrs_spin); 199536b71a8bSDavid Teigland list_for_each_entry_safe(na, safe, &dlm_node_addrs, list) { 199636b71a8bSDavid Teigland list_del(&na->list); 199736b71a8bSDavid Teigland while (na->addr_count--) 199836b71a8bSDavid Teigland kfree(na->addr[na->addr_count]); 199936b71a8bSDavid Teigland kfree(na); 200036b71a8bSDavid Teigland } 200136b71a8bSDavid Teigland spin_unlock(&dlm_node_addrs_spin); 200236b71a8bSDavid Teigland } 2003