12522fe45SThomas Gleixner // SPDX-License-Identifier: GPL-2.0-only 26ed7257bSPatrick Caulfield /****************************************************************************** 36ed7257bSPatrick Caulfield ******************************************************************************* 46ed7257bSPatrick Caulfield ** 56ed7257bSPatrick Caulfield ** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. 65e9ccc37SChristine Caulfield ** Copyright (C) 2004-2009 Red Hat, Inc. All rights reserved. 76ed7257bSPatrick Caulfield ** 86ed7257bSPatrick Caulfield ** 96ed7257bSPatrick Caulfield ******************************************************************************* 106ed7257bSPatrick Caulfield ******************************************************************************/ 116ed7257bSPatrick Caulfield 126ed7257bSPatrick Caulfield /* 136ed7257bSPatrick Caulfield * lowcomms.c 146ed7257bSPatrick Caulfield * 156ed7257bSPatrick Caulfield * This is the "low-level" comms layer. 166ed7257bSPatrick Caulfield * 176ed7257bSPatrick Caulfield * It is responsible for sending/receiving messages 186ed7257bSPatrick Caulfield * from other nodes in the cluster. 196ed7257bSPatrick Caulfield * 206ed7257bSPatrick Caulfield * Cluster nodes are referred to by their nodeids. nodeids are 216ed7257bSPatrick Caulfield * simply 32 bit numbers to the locking module - if they need to 222cf12c0bSJoe Perches * be expanded for the cluster infrastructure then that is its 236ed7257bSPatrick Caulfield * responsibility. It is this layer's 246ed7257bSPatrick Caulfield * responsibility to resolve these into IP address or 256ed7257bSPatrick Caulfield * whatever it needs for inter-node communication. 266ed7257bSPatrick Caulfield * 276ed7257bSPatrick Caulfield * The comms level is two kernel threads that deal mainly with 286ed7257bSPatrick Caulfield * the receiving of messages from other nodes and passing them 296ed7257bSPatrick Caulfield * up to the mid-level comms layer (which understands the 306ed7257bSPatrick Caulfield * message format) for execution by the locking core, and 316ed7257bSPatrick Caulfield * a send thread which does all the setting up of connections 326ed7257bSPatrick Caulfield * to remote nodes and the sending of data. Threads are not allowed 336ed7257bSPatrick Caulfield * to send their own data because it may cause them to wait in times 346ed7257bSPatrick Caulfield * of high load. Also, this way, the sending thread can collect together 356ed7257bSPatrick Caulfield * messages bound for one node and send them in one block. 366ed7257bSPatrick Caulfield * 372cf12c0bSJoe Perches * lowcomms will choose to use either TCP or SCTP as its transport layer 386ed7257bSPatrick Caulfield * depending on the configuration variable 'protocol'. This should be set 396ed7257bSPatrick Caulfield * to 0 (default) for TCP or 1 for SCTP. It should be configured using a 406ed7257bSPatrick Caulfield * cluster-wide mechanism as it must be the same on all nodes of the cluster 416ed7257bSPatrick Caulfield * for the DLM to function. 426ed7257bSPatrick Caulfield * 436ed7257bSPatrick Caulfield */ 446ed7257bSPatrick Caulfield 456ed7257bSPatrick Caulfield #include <asm/ioctls.h> 466ed7257bSPatrick Caulfield #include <net/sock.h> 476ed7257bSPatrick Caulfield #include <net/tcp.h> 486ed7257bSPatrick Caulfield #include <linux/pagemap.h> 496ed7257bSPatrick Caulfield #include <linux/file.h> 507a936ce7SMatthias Kaehlcke #include <linux/mutex.h> 516ed7257bSPatrick Caulfield #include <linux/sctp.h> 525a0e3ad6STejun Heo #include <linux/slab.h> 532f2d76ccSBenjamin Poirier #include <net/sctp/sctp.h> 5444ad532bSJoe Perches #include <net/ipv6.h> 556ed7257bSPatrick Caulfield 566ed7257bSPatrick Caulfield #include "dlm_internal.h" 576ed7257bSPatrick Caulfield #include "lowcomms.h" 586ed7257bSPatrick Caulfield #include "midcomms.h" 596ed7257bSPatrick Caulfield #include "config.h" 606ed7257bSPatrick Caulfield 616ed7257bSPatrick Caulfield #define NEEDED_RMEM (4*1024*1024) 625e9ccc37SChristine Caulfield #define CONN_HASH_SIZE 32 636ed7257bSPatrick Caulfield 64f92c8dd7SBob Peterson /* Number of messages to send before rescheduling */ 65f92c8dd7SBob Peterson #define MAX_SEND_MSG_COUNT 25 66055923bfSAlexander Aring #define DLM_SHUTDOWN_WAIT_TIMEOUT msecs_to_jiffies(10000) 67f92c8dd7SBob Peterson 686ed7257bSPatrick Caulfield struct cbuf { 696ed7257bSPatrick Caulfield unsigned int base; 706ed7257bSPatrick Caulfield unsigned int len; 716ed7257bSPatrick Caulfield unsigned int mask; 726ed7257bSPatrick Caulfield }; 736ed7257bSPatrick Caulfield 746ed7257bSPatrick Caulfield static void cbuf_add(struct cbuf *cb, int n) 756ed7257bSPatrick Caulfield { 766ed7257bSPatrick Caulfield cb->len += n; 776ed7257bSPatrick Caulfield } 786ed7257bSPatrick Caulfield 796ed7257bSPatrick Caulfield static int cbuf_data(struct cbuf *cb) 806ed7257bSPatrick Caulfield { 816ed7257bSPatrick Caulfield return ((cb->base + cb->len) & cb->mask); 826ed7257bSPatrick Caulfield } 836ed7257bSPatrick Caulfield 846ed7257bSPatrick Caulfield static void cbuf_init(struct cbuf *cb, int size) 856ed7257bSPatrick Caulfield { 866ed7257bSPatrick Caulfield cb->base = cb->len = 0; 876ed7257bSPatrick Caulfield cb->mask = size-1; 886ed7257bSPatrick Caulfield } 896ed7257bSPatrick Caulfield 906ed7257bSPatrick Caulfield static void cbuf_eat(struct cbuf *cb, int n) 916ed7257bSPatrick Caulfield { 926ed7257bSPatrick Caulfield cb->len -= n; 936ed7257bSPatrick Caulfield cb->base += n; 946ed7257bSPatrick Caulfield cb->base &= cb->mask; 956ed7257bSPatrick Caulfield } 966ed7257bSPatrick Caulfield 976ed7257bSPatrick Caulfield static bool cbuf_empty(struct cbuf *cb) 986ed7257bSPatrick Caulfield { 996ed7257bSPatrick Caulfield return cb->len == 0; 1006ed7257bSPatrick Caulfield } 1016ed7257bSPatrick Caulfield 1026ed7257bSPatrick Caulfield struct connection { 1036ed7257bSPatrick Caulfield struct socket *sock; /* NULL if not connected */ 1046ed7257bSPatrick Caulfield uint32_t nodeid; /* So we know who we are in the list */ 1056ed7257bSPatrick Caulfield struct mutex sock_mutex; 1066ed7257bSPatrick Caulfield unsigned long flags; 1076ed7257bSPatrick Caulfield #define CF_READ_PENDING 1 1088a4abb08Stsutomu.owa@toshiba.co.jp #define CF_WRITE_PENDING 2 1096ed7257bSPatrick Caulfield #define CF_INIT_PENDING 4 1106ed7257bSPatrick Caulfield #define CF_IS_OTHERCON 5 111063c4c99SLars Marowsky-Bree #define CF_CLOSE 6 112b36930ddSDavid Miller #define CF_APP_LIMITED 7 113b2a66629Stsutomu.owa@toshiba.co.jp #define CF_CLOSING 8 114055923bfSAlexander Aring #define CF_SHUTDOWN 9 1156ed7257bSPatrick Caulfield struct list_head writequeue; /* List of outgoing writequeue_entries */ 1166ed7257bSPatrick Caulfield spinlock_t writequeue_lock; 1176ed7257bSPatrick Caulfield int (*rx_action) (struct connection *); /* What to do when active */ 1186ed7257bSPatrick Caulfield void (*connect_action) (struct connection *); /* What to do to connect */ 119055923bfSAlexander Aring void (*shutdown_action)(struct connection *con); /* What to do to shutdown */ 1206ed7257bSPatrick Caulfield struct page *rx_page; 1216ed7257bSPatrick Caulfield struct cbuf cb; 1226ed7257bSPatrick Caulfield int retries; 1236ed7257bSPatrick Caulfield #define MAX_CONNECT_RETRIES 3 1245e9ccc37SChristine Caulfield struct hlist_node list; 1256ed7257bSPatrick Caulfield struct connection *othercon; 1266ed7257bSPatrick Caulfield struct work_struct rwork; /* Receive workqueue */ 1276ed7257bSPatrick Caulfield struct work_struct swork; /* Send workqueue */ 128055923bfSAlexander Aring wait_queue_head_t shutdown_wait; /* wait for graceful shutdown */ 1296ed7257bSPatrick Caulfield }; 1306ed7257bSPatrick Caulfield #define sock2con(x) ((struct connection *)(x)->sk_user_data) 1316ed7257bSPatrick Caulfield 1326ed7257bSPatrick Caulfield /* An entry waiting to be sent */ 1336ed7257bSPatrick Caulfield struct writequeue_entry { 1346ed7257bSPatrick Caulfield struct list_head list; 1356ed7257bSPatrick Caulfield struct page *page; 1366ed7257bSPatrick Caulfield int offset; 1376ed7257bSPatrick Caulfield int len; 1386ed7257bSPatrick Caulfield int end; 1396ed7257bSPatrick Caulfield int users; 1406ed7257bSPatrick Caulfield struct connection *con; 1416ed7257bSPatrick Caulfield }; 1426ed7257bSPatrick Caulfield 14336b71a8bSDavid Teigland struct dlm_node_addr { 14436b71a8bSDavid Teigland struct list_head list; 14536b71a8bSDavid Teigland int nodeid; 14636b71a8bSDavid Teigland int addr_count; 14798e1b60eSMike Christie int curr_addr_index; 14836b71a8bSDavid Teigland struct sockaddr_storage *addr[DLM_MAX_ADDR_COUNT]; 14936b71a8bSDavid Teigland }; 15036b71a8bSDavid Teigland 151cc661fc9SBob Peterson static struct listen_sock_callbacks { 152cc661fc9SBob Peterson void (*sk_error_report)(struct sock *); 153cc661fc9SBob Peterson void (*sk_data_ready)(struct sock *); 154cc661fc9SBob Peterson void (*sk_state_change)(struct sock *); 155cc661fc9SBob Peterson void (*sk_write_space)(struct sock *); 156cc661fc9SBob Peterson } listen_sock; 157cc661fc9SBob Peterson 15836b71a8bSDavid Teigland static LIST_HEAD(dlm_node_addrs); 15936b71a8bSDavid Teigland static DEFINE_SPINLOCK(dlm_node_addrs_spin); 16036b71a8bSDavid Teigland 1616ed7257bSPatrick Caulfield static struct sockaddr_storage *dlm_local_addr[DLM_MAX_ADDR_COUNT]; 1626ed7257bSPatrick Caulfield static int dlm_local_count; 163513ef596SDavid Teigland static int dlm_allow_conn; 1646ed7257bSPatrick Caulfield 1656ed7257bSPatrick Caulfield /* Work queues */ 1666ed7257bSPatrick Caulfield static struct workqueue_struct *recv_workqueue; 1676ed7257bSPatrick Caulfield static struct workqueue_struct *send_workqueue; 1686ed7257bSPatrick Caulfield 1695e9ccc37SChristine Caulfield static struct hlist_head connection_hash[CONN_HASH_SIZE]; 1707a936ce7SMatthias Kaehlcke static DEFINE_MUTEX(connections_lock); 1716ed7257bSPatrick Caulfield static struct kmem_cache *con_cache; 1726ed7257bSPatrick Caulfield 1736ed7257bSPatrick Caulfield static void process_recv_sockets(struct work_struct *work); 1746ed7257bSPatrick Caulfield static void process_send_sockets(struct work_struct *work); 1756ed7257bSPatrick Caulfield 1765e9ccc37SChristine Caulfield 1775e9ccc37SChristine Caulfield /* This is deliberately very simple because most clusters have simple 1785e9ccc37SChristine Caulfield sequential nodeids, so we should be able to go straight to a connection 1795e9ccc37SChristine Caulfield struct in the array */ 1805e9ccc37SChristine Caulfield static inline int nodeid_hash(int nodeid) 1815e9ccc37SChristine Caulfield { 1825e9ccc37SChristine Caulfield return nodeid & (CONN_HASH_SIZE-1); 1835e9ccc37SChristine Caulfield } 1845e9ccc37SChristine Caulfield 1855e9ccc37SChristine Caulfield static struct connection *__find_con(int nodeid) 1865e9ccc37SChristine Caulfield { 1875e9ccc37SChristine Caulfield int r; 1885e9ccc37SChristine Caulfield struct connection *con; 1895e9ccc37SChristine Caulfield 1905e9ccc37SChristine Caulfield r = nodeid_hash(nodeid); 1915e9ccc37SChristine Caulfield 192b67bfe0dSSasha Levin hlist_for_each_entry(con, &connection_hash[r], list) { 1935e9ccc37SChristine Caulfield if (con->nodeid == nodeid) 1945e9ccc37SChristine Caulfield return con; 1955e9ccc37SChristine Caulfield } 1965e9ccc37SChristine Caulfield return NULL; 1975e9ccc37SChristine Caulfield } 1985e9ccc37SChristine Caulfield 1996ed7257bSPatrick Caulfield /* 2006ed7257bSPatrick Caulfield * If 'allocation' is zero then we don't attempt to create a new 2016ed7257bSPatrick Caulfield * connection structure for this node. 2026ed7257bSPatrick Caulfield */ 2036ed7257bSPatrick Caulfield static struct connection *__nodeid2con(int nodeid, gfp_t alloc) 2046ed7257bSPatrick Caulfield { 2056ed7257bSPatrick Caulfield struct connection *con = NULL; 2066ed7257bSPatrick Caulfield int r; 2076ed7257bSPatrick Caulfield 2085e9ccc37SChristine Caulfield con = __find_con(nodeid); 2096ed7257bSPatrick Caulfield if (con || !alloc) 2106ed7257bSPatrick Caulfield return con; 2116ed7257bSPatrick Caulfield 2126ed7257bSPatrick Caulfield con = kmem_cache_zalloc(con_cache, alloc); 2136ed7257bSPatrick Caulfield if (!con) 2146ed7257bSPatrick Caulfield return NULL; 2156ed7257bSPatrick Caulfield 2165e9ccc37SChristine Caulfield r = nodeid_hash(nodeid); 2175e9ccc37SChristine Caulfield hlist_add_head(&con->list, &connection_hash[r]); 2186ed7257bSPatrick Caulfield 2196ed7257bSPatrick Caulfield con->nodeid = nodeid; 2206ed7257bSPatrick Caulfield mutex_init(&con->sock_mutex); 2216ed7257bSPatrick Caulfield INIT_LIST_HEAD(&con->writequeue); 2226ed7257bSPatrick Caulfield spin_lock_init(&con->writequeue_lock); 2236ed7257bSPatrick Caulfield INIT_WORK(&con->swork, process_send_sockets); 2246ed7257bSPatrick Caulfield INIT_WORK(&con->rwork, process_recv_sockets); 225055923bfSAlexander Aring init_waitqueue_head(&con->shutdown_wait); 2266ed7257bSPatrick Caulfield 2276ed7257bSPatrick Caulfield /* Setup action pointers for child sockets */ 2286ed7257bSPatrick Caulfield if (con->nodeid) { 2295e9ccc37SChristine Caulfield struct connection *zerocon = __find_con(0); 2306ed7257bSPatrick Caulfield 2316ed7257bSPatrick Caulfield con->connect_action = zerocon->connect_action; 2326ed7257bSPatrick Caulfield if (!con->rx_action) 2336ed7257bSPatrick Caulfield con->rx_action = zerocon->rx_action; 2346ed7257bSPatrick Caulfield } 2356ed7257bSPatrick Caulfield 2366ed7257bSPatrick Caulfield return con; 2376ed7257bSPatrick Caulfield } 2386ed7257bSPatrick Caulfield 2395e9ccc37SChristine Caulfield /* Loop round all connections */ 2405e9ccc37SChristine Caulfield static void foreach_conn(void (*conn_func)(struct connection *c)) 2415e9ccc37SChristine Caulfield { 2425e9ccc37SChristine Caulfield int i; 243b67bfe0dSSasha Levin struct hlist_node *n; 2445e9ccc37SChristine Caulfield struct connection *con; 2455e9ccc37SChristine Caulfield 2465e9ccc37SChristine Caulfield for (i = 0; i < CONN_HASH_SIZE; i++) { 247b67bfe0dSSasha Levin hlist_for_each_entry_safe(con, n, &connection_hash[i], list) 2485e9ccc37SChristine Caulfield conn_func(con); 2495e9ccc37SChristine Caulfield } 2505e9ccc37SChristine Caulfield } 2515e9ccc37SChristine Caulfield 2526ed7257bSPatrick Caulfield static struct connection *nodeid2con(int nodeid, gfp_t allocation) 2536ed7257bSPatrick Caulfield { 2546ed7257bSPatrick Caulfield struct connection *con; 2556ed7257bSPatrick Caulfield 2567a936ce7SMatthias Kaehlcke mutex_lock(&connections_lock); 2576ed7257bSPatrick Caulfield con = __nodeid2con(nodeid, allocation); 2587a936ce7SMatthias Kaehlcke mutex_unlock(&connections_lock); 2596ed7257bSPatrick Caulfield 2606ed7257bSPatrick Caulfield return con; 2616ed7257bSPatrick Caulfield } 2626ed7257bSPatrick Caulfield 26336b71a8bSDavid Teigland static struct dlm_node_addr *find_node_addr(int nodeid) 2646ed7257bSPatrick Caulfield { 26536b71a8bSDavid Teigland struct dlm_node_addr *na; 26636b71a8bSDavid Teigland 26736b71a8bSDavid Teigland list_for_each_entry(na, &dlm_node_addrs, list) { 26836b71a8bSDavid Teigland if (na->nodeid == nodeid) 26936b71a8bSDavid Teigland return na; 27036b71a8bSDavid Teigland } 27136b71a8bSDavid Teigland return NULL; 27236b71a8bSDavid Teigland } 27336b71a8bSDavid Teigland 27436b71a8bSDavid Teigland static int addr_compare(struct sockaddr_storage *x, struct sockaddr_storage *y) 27536b71a8bSDavid Teigland { 27636b71a8bSDavid Teigland switch (x->ss_family) { 27736b71a8bSDavid Teigland case AF_INET: { 27836b71a8bSDavid Teigland struct sockaddr_in *sinx = (struct sockaddr_in *)x; 27936b71a8bSDavid Teigland struct sockaddr_in *siny = (struct sockaddr_in *)y; 28036b71a8bSDavid Teigland if (sinx->sin_addr.s_addr != siny->sin_addr.s_addr) 28136b71a8bSDavid Teigland return 0; 28236b71a8bSDavid Teigland if (sinx->sin_port != siny->sin_port) 28336b71a8bSDavid Teigland return 0; 28436b71a8bSDavid Teigland break; 28536b71a8bSDavid Teigland } 28636b71a8bSDavid Teigland case AF_INET6: { 28736b71a8bSDavid Teigland struct sockaddr_in6 *sinx = (struct sockaddr_in6 *)x; 28836b71a8bSDavid Teigland struct sockaddr_in6 *siny = (struct sockaddr_in6 *)y; 28936b71a8bSDavid Teigland if (!ipv6_addr_equal(&sinx->sin6_addr, &siny->sin6_addr)) 29036b71a8bSDavid Teigland return 0; 29136b71a8bSDavid Teigland if (sinx->sin6_port != siny->sin6_port) 29236b71a8bSDavid Teigland return 0; 29336b71a8bSDavid Teigland break; 29436b71a8bSDavid Teigland } 29536b71a8bSDavid Teigland default: 29636b71a8bSDavid Teigland return 0; 29736b71a8bSDavid Teigland } 29836b71a8bSDavid Teigland return 1; 29936b71a8bSDavid Teigland } 30036b71a8bSDavid Teigland 30136b71a8bSDavid Teigland static int nodeid_to_addr(int nodeid, struct sockaddr_storage *sas_out, 30298e1b60eSMike Christie struct sockaddr *sa_out, bool try_new_addr) 30336b71a8bSDavid Teigland { 30436b71a8bSDavid Teigland struct sockaddr_storage sas; 30536b71a8bSDavid Teigland struct dlm_node_addr *na; 3066ed7257bSPatrick Caulfield 3076ed7257bSPatrick Caulfield if (!dlm_local_count) 3086ed7257bSPatrick Caulfield return -1; 3096ed7257bSPatrick Caulfield 31036b71a8bSDavid Teigland spin_lock(&dlm_node_addrs_spin); 31136b71a8bSDavid Teigland na = find_node_addr(nodeid); 31298e1b60eSMike Christie if (na && na->addr_count) { 313ee44b4bcSMarcelo Ricardo Leitner memcpy(&sas, na->addr[na->curr_addr_index], 314ee44b4bcSMarcelo Ricardo Leitner sizeof(struct sockaddr_storage)); 315ee44b4bcSMarcelo Ricardo Leitner 31698e1b60eSMike Christie if (try_new_addr) { 31798e1b60eSMike Christie na->curr_addr_index++; 31898e1b60eSMike Christie if (na->curr_addr_index == na->addr_count) 31998e1b60eSMike Christie na->curr_addr_index = 0; 32098e1b60eSMike Christie } 32198e1b60eSMike Christie } 32236b71a8bSDavid Teigland spin_unlock(&dlm_node_addrs_spin); 32336b71a8bSDavid Teigland 32436b71a8bSDavid Teigland if (!na) 32536b71a8bSDavid Teigland return -EEXIST; 32636b71a8bSDavid Teigland 32736b71a8bSDavid Teigland if (!na->addr_count) 32836b71a8bSDavid Teigland return -ENOENT; 32936b71a8bSDavid Teigland 33036b71a8bSDavid Teigland if (sas_out) 33136b71a8bSDavid Teigland memcpy(sas_out, &sas, sizeof(struct sockaddr_storage)); 33236b71a8bSDavid Teigland 33336b71a8bSDavid Teigland if (!sa_out) 33436b71a8bSDavid Teigland return 0; 3356ed7257bSPatrick Caulfield 3366ed7257bSPatrick Caulfield if (dlm_local_addr[0]->ss_family == AF_INET) { 33736b71a8bSDavid Teigland struct sockaddr_in *in4 = (struct sockaddr_in *) &sas; 33836b71a8bSDavid Teigland struct sockaddr_in *ret4 = (struct sockaddr_in *) sa_out; 3396ed7257bSPatrick Caulfield ret4->sin_addr.s_addr = in4->sin_addr.s_addr; 3406ed7257bSPatrick Caulfield } else { 34136b71a8bSDavid Teigland struct sockaddr_in6 *in6 = (struct sockaddr_in6 *) &sas; 34236b71a8bSDavid Teigland struct sockaddr_in6 *ret6 = (struct sockaddr_in6 *) sa_out; 3434e3fd7a0SAlexey Dobriyan ret6->sin6_addr = in6->sin6_addr; 3446ed7257bSPatrick Caulfield } 3456ed7257bSPatrick Caulfield 3466ed7257bSPatrick Caulfield return 0; 3476ed7257bSPatrick Caulfield } 3486ed7257bSPatrick Caulfield 34936b71a8bSDavid Teigland static int addr_to_nodeid(struct sockaddr_storage *addr, int *nodeid) 35036b71a8bSDavid Teigland { 35136b71a8bSDavid Teigland struct dlm_node_addr *na; 35236b71a8bSDavid Teigland int rv = -EEXIST; 35398e1b60eSMike Christie int addr_i; 35436b71a8bSDavid Teigland 35536b71a8bSDavid Teigland spin_lock(&dlm_node_addrs_spin); 35636b71a8bSDavid Teigland list_for_each_entry(na, &dlm_node_addrs, list) { 35736b71a8bSDavid Teigland if (!na->addr_count) 35836b71a8bSDavid Teigland continue; 35936b71a8bSDavid Teigland 36098e1b60eSMike Christie for (addr_i = 0; addr_i < na->addr_count; addr_i++) { 36198e1b60eSMike Christie if (addr_compare(na->addr[addr_i], addr)) { 36236b71a8bSDavid Teigland *nodeid = na->nodeid; 36336b71a8bSDavid Teigland rv = 0; 36498e1b60eSMike Christie goto unlock; 36536b71a8bSDavid Teigland } 36698e1b60eSMike Christie } 36798e1b60eSMike Christie } 36898e1b60eSMike Christie unlock: 36936b71a8bSDavid Teigland spin_unlock(&dlm_node_addrs_spin); 37036b71a8bSDavid Teigland return rv; 37136b71a8bSDavid Teigland } 37236b71a8bSDavid Teigland 37336b71a8bSDavid Teigland int dlm_lowcomms_addr(int nodeid, struct sockaddr_storage *addr, int len) 37436b71a8bSDavid Teigland { 37536b71a8bSDavid Teigland struct sockaddr_storage *new_addr; 37636b71a8bSDavid Teigland struct dlm_node_addr *new_node, *na; 37736b71a8bSDavid Teigland 37836b71a8bSDavid Teigland new_node = kzalloc(sizeof(struct dlm_node_addr), GFP_NOFS); 37936b71a8bSDavid Teigland if (!new_node) 38036b71a8bSDavid Teigland return -ENOMEM; 38136b71a8bSDavid Teigland 38236b71a8bSDavid Teigland new_addr = kzalloc(sizeof(struct sockaddr_storage), GFP_NOFS); 38336b71a8bSDavid Teigland if (!new_addr) { 38436b71a8bSDavid Teigland kfree(new_node); 38536b71a8bSDavid Teigland return -ENOMEM; 38636b71a8bSDavid Teigland } 38736b71a8bSDavid Teigland 38836b71a8bSDavid Teigland memcpy(new_addr, addr, len); 38936b71a8bSDavid Teigland 39036b71a8bSDavid Teigland spin_lock(&dlm_node_addrs_spin); 39136b71a8bSDavid Teigland na = find_node_addr(nodeid); 39236b71a8bSDavid Teigland if (!na) { 39336b71a8bSDavid Teigland new_node->nodeid = nodeid; 39436b71a8bSDavid Teigland new_node->addr[0] = new_addr; 39536b71a8bSDavid Teigland new_node->addr_count = 1; 39636b71a8bSDavid Teigland list_add(&new_node->list, &dlm_node_addrs); 39736b71a8bSDavid Teigland spin_unlock(&dlm_node_addrs_spin); 39836b71a8bSDavid Teigland return 0; 39936b71a8bSDavid Teigland } 40036b71a8bSDavid Teigland 40136b71a8bSDavid Teigland if (na->addr_count >= DLM_MAX_ADDR_COUNT) { 40236b71a8bSDavid Teigland spin_unlock(&dlm_node_addrs_spin); 40336b71a8bSDavid Teigland kfree(new_addr); 40436b71a8bSDavid Teigland kfree(new_node); 40536b71a8bSDavid Teigland return -ENOSPC; 40636b71a8bSDavid Teigland } 40736b71a8bSDavid Teigland 40836b71a8bSDavid Teigland na->addr[na->addr_count++] = new_addr; 40936b71a8bSDavid Teigland spin_unlock(&dlm_node_addrs_spin); 41036b71a8bSDavid Teigland kfree(new_node); 41136b71a8bSDavid Teigland return 0; 41236b71a8bSDavid Teigland } 41336b71a8bSDavid Teigland 4146ed7257bSPatrick Caulfield /* Data available on socket or listen socket received a connect */ 415676d2369SDavid S. Miller static void lowcomms_data_ready(struct sock *sk) 4166ed7257bSPatrick Caulfield { 41793eaadebStsutomu.owa@toshiba.co.jp struct connection *con; 41893eaadebStsutomu.owa@toshiba.co.jp 41993eaadebStsutomu.owa@toshiba.co.jp read_lock_bh(&sk->sk_callback_lock); 42093eaadebStsutomu.owa@toshiba.co.jp con = sock2con(sk); 421afb853fbSPatrick Caulfield if (con && !test_and_set_bit(CF_READ_PENDING, &con->flags)) 4226ed7257bSPatrick Caulfield queue_work(recv_workqueue, &con->rwork); 42393eaadebStsutomu.owa@toshiba.co.jp read_unlock_bh(&sk->sk_callback_lock); 4246ed7257bSPatrick Caulfield } 4256ed7257bSPatrick Caulfield 4266ed7257bSPatrick Caulfield static void lowcomms_write_space(struct sock *sk) 4276ed7257bSPatrick Caulfield { 42893eaadebStsutomu.owa@toshiba.co.jp struct connection *con; 4296ed7257bSPatrick Caulfield 43093eaadebStsutomu.owa@toshiba.co.jp read_lock_bh(&sk->sk_callback_lock); 43193eaadebStsutomu.owa@toshiba.co.jp con = sock2con(sk); 432b36930ddSDavid Miller if (!con) 43393eaadebStsutomu.owa@toshiba.co.jp goto out; 434b36930ddSDavid Miller 435b36930ddSDavid Miller clear_bit(SOCK_NOSPACE, &con->sock->flags); 436b36930ddSDavid Miller 437b36930ddSDavid Miller if (test_and_clear_bit(CF_APP_LIMITED, &con->flags)) { 438b36930ddSDavid Miller con->sock->sk->sk_write_pending--; 4399cd3e072SEric Dumazet clear_bit(SOCKWQ_ASYNC_NOSPACE, &con->sock->flags); 440b36930ddSDavid Miller } 441b36930ddSDavid Miller 4426ed7257bSPatrick Caulfield queue_work(send_workqueue, &con->swork); 44393eaadebStsutomu.owa@toshiba.co.jp out: 44493eaadebStsutomu.owa@toshiba.co.jp read_unlock_bh(&sk->sk_callback_lock); 4456ed7257bSPatrick Caulfield } 4466ed7257bSPatrick Caulfield 4476ed7257bSPatrick Caulfield static inline void lowcomms_connect_sock(struct connection *con) 4486ed7257bSPatrick Caulfield { 449063c4c99SLars Marowsky-Bree if (test_bit(CF_CLOSE, &con->flags)) 450063c4c99SLars Marowsky-Bree return; 4516ed7257bSPatrick Caulfield queue_work(send_workqueue, &con->swork); 45261d9102bSBob Peterson cond_resched(); 4536ed7257bSPatrick Caulfield } 4546ed7257bSPatrick Caulfield 4556ed7257bSPatrick Caulfield static void lowcomms_state_change(struct sock *sk) 4566ed7257bSPatrick Caulfield { 457ee44b4bcSMarcelo Ricardo Leitner /* SCTP layer is not calling sk_data_ready when the connection 458ee44b4bcSMarcelo Ricardo Leitner * is done, so we catch the signal through here. Also, it 459ee44b4bcSMarcelo Ricardo Leitner * doesn't switch socket state when entering shutdown, so we 460ee44b4bcSMarcelo Ricardo Leitner * skip the write in that case. 461ee44b4bcSMarcelo Ricardo Leitner */ 462ee44b4bcSMarcelo Ricardo Leitner if (sk->sk_shutdown) { 463ee44b4bcSMarcelo Ricardo Leitner if (sk->sk_shutdown == RCV_SHUTDOWN) 464ee44b4bcSMarcelo Ricardo Leitner lowcomms_data_ready(sk); 465ee44b4bcSMarcelo Ricardo Leitner } else if (sk->sk_state == TCP_ESTABLISHED) { 4666ed7257bSPatrick Caulfield lowcomms_write_space(sk); 4676ed7257bSPatrick Caulfield } 468ee44b4bcSMarcelo Ricardo Leitner } 4696ed7257bSPatrick Caulfield 470391fbdc5SChristine Caulfield int dlm_lowcomms_connect_node(int nodeid) 471391fbdc5SChristine Caulfield { 472391fbdc5SChristine Caulfield struct connection *con; 473391fbdc5SChristine Caulfield 474391fbdc5SChristine Caulfield if (nodeid == dlm_our_nodeid()) 475391fbdc5SChristine Caulfield return 0; 476391fbdc5SChristine Caulfield 477391fbdc5SChristine Caulfield con = nodeid2con(nodeid, GFP_NOFS); 478391fbdc5SChristine Caulfield if (!con) 479391fbdc5SChristine Caulfield return -ENOMEM; 480391fbdc5SChristine Caulfield lowcomms_connect_sock(con); 481391fbdc5SChristine Caulfield return 0; 482391fbdc5SChristine Caulfield } 483391fbdc5SChristine Caulfield 484b3a5bbfdSBob Peterson static void lowcomms_error_report(struct sock *sk) 485b3a5bbfdSBob Peterson { 486b81171cbSBob Peterson struct connection *con; 487b3a5bbfdSBob Peterson struct sockaddr_storage saddr; 488b81171cbSBob Peterson void (*orig_report)(struct sock *) = NULL; 489b3a5bbfdSBob Peterson 490b81171cbSBob Peterson read_lock_bh(&sk->sk_callback_lock); 491b81171cbSBob Peterson con = sock2con(sk); 492b81171cbSBob Peterson if (con == NULL) 493b81171cbSBob Peterson goto out; 494b81171cbSBob Peterson 495cc661fc9SBob Peterson orig_report = listen_sock.sk_error_report; 4961a31833dSBob Peterson if (con->sock == NULL || 4979b2c45d4SDenys Vlasenko kernel_getpeername(con->sock, (struct sockaddr *)&saddr) < 0) { 498b3a5bbfdSBob Peterson printk_ratelimited(KERN_ERR "dlm: node %d: socket error " 499b3a5bbfdSBob Peterson "sending to node %d, port %d, " 500b3a5bbfdSBob Peterson "sk_err=%d/%d\n", dlm_our_nodeid(), 501b3a5bbfdSBob Peterson con->nodeid, dlm_config.ci_tcp_port, 502b3a5bbfdSBob Peterson sk->sk_err, sk->sk_err_soft); 503b3a5bbfdSBob Peterson } else if (saddr.ss_family == AF_INET) { 504b3a5bbfdSBob Peterson struct sockaddr_in *sin4 = (struct sockaddr_in *)&saddr; 505b3a5bbfdSBob Peterson 506b3a5bbfdSBob Peterson printk_ratelimited(KERN_ERR "dlm: node %d: socket error " 507b3a5bbfdSBob Peterson "sending to node %d at %pI4, port %d, " 508b3a5bbfdSBob Peterson "sk_err=%d/%d\n", dlm_our_nodeid(), 509b3a5bbfdSBob Peterson con->nodeid, &sin4->sin_addr.s_addr, 510b3a5bbfdSBob Peterson dlm_config.ci_tcp_port, sk->sk_err, 511b3a5bbfdSBob Peterson sk->sk_err_soft); 512b3a5bbfdSBob Peterson } else { 513b3a5bbfdSBob Peterson struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&saddr; 514b3a5bbfdSBob Peterson 515b3a5bbfdSBob Peterson printk_ratelimited(KERN_ERR "dlm: node %d: socket error " 516b3a5bbfdSBob Peterson "sending to node %d at %u.%u.%u.%u, " 517b3a5bbfdSBob Peterson "port %d, sk_err=%d/%d\n", dlm_our_nodeid(), 518b3a5bbfdSBob Peterson con->nodeid, sin6->sin6_addr.s6_addr32[0], 519b3a5bbfdSBob Peterson sin6->sin6_addr.s6_addr32[1], 520b3a5bbfdSBob Peterson sin6->sin6_addr.s6_addr32[2], 521b3a5bbfdSBob Peterson sin6->sin6_addr.s6_addr32[3], 522b3a5bbfdSBob Peterson dlm_config.ci_tcp_port, sk->sk_err, 523b3a5bbfdSBob Peterson sk->sk_err_soft); 524b3a5bbfdSBob Peterson } 525b81171cbSBob Peterson out: 526b81171cbSBob Peterson read_unlock_bh(&sk->sk_callback_lock); 527b81171cbSBob Peterson if (orig_report) 528b81171cbSBob Peterson orig_report(sk); 529b81171cbSBob Peterson } 530b81171cbSBob Peterson 531b81171cbSBob Peterson /* Note: sk_callback_lock must be locked before calling this function. */ 532cc661fc9SBob Peterson static void save_listen_callbacks(struct socket *sock) 533b81171cbSBob Peterson { 534cc661fc9SBob Peterson struct sock *sk = sock->sk; 535cc661fc9SBob Peterson 536cc661fc9SBob Peterson listen_sock.sk_data_ready = sk->sk_data_ready; 537cc661fc9SBob Peterson listen_sock.sk_state_change = sk->sk_state_change; 538cc661fc9SBob Peterson listen_sock.sk_write_space = sk->sk_write_space; 539cc661fc9SBob Peterson listen_sock.sk_error_report = sk->sk_error_report; 540b81171cbSBob Peterson } 541b81171cbSBob Peterson 542cc661fc9SBob Peterson static void restore_callbacks(struct socket *sock) 543b81171cbSBob Peterson { 544cc661fc9SBob Peterson struct sock *sk = sock->sk; 545cc661fc9SBob Peterson 546b81171cbSBob Peterson write_lock_bh(&sk->sk_callback_lock); 547b81171cbSBob Peterson sk->sk_user_data = NULL; 548cc661fc9SBob Peterson sk->sk_data_ready = listen_sock.sk_data_ready; 549cc661fc9SBob Peterson sk->sk_state_change = listen_sock.sk_state_change; 550cc661fc9SBob Peterson sk->sk_write_space = listen_sock.sk_write_space; 551cc661fc9SBob Peterson sk->sk_error_report = listen_sock.sk_error_report; 552b81171cbSBob Peterson write_unlock_bh(&sk->sk_callback_lock); 553b3a5bbfdSBob Peterson } 554b3a5bbfdSBob Peterson 5556ed7257bSPatrick Caulfield /* Make a socket active */ 556988419a9Stsutomu.owa@toshiba.co.jp static void add_sock(struct socket *sock, struct connection *con) 5576ed7257bSPatrick Caulfield { 558b81171cbSBob Peterson struct sock *sk = sock->sk; 559b81171cbSBob Peterson 560b81171cbSBob Peterson write_lock_bh(&sk->sk_callback_lock); 5616ed7257bSPatrick Caulfield con->sock = sock; 5626ed7257bSPatrick Caulfield 563b81171cbSBob Peterson sk->sk_user_data = con; 5646ed7257bSPatrick Caulfield /* Install a data_ready callback */ 565b81171cbSBob Peterson sk->sk_data_ready = lowcomms_data_ready; 566b81171cbSBob Peterson sk->sk_write_space = lowcomms_write_space; 567b81171cbSBob Peterson sk->sk_state_change = lowcomms_state_change; 568b81171cbSBob Peterson sk->sk_allocation = GFP_NOFS; 569b81171cbSBob Peterson sk->sk_error_report = lowcomms_error_report; 570b81171cbSBob Peterson write_unlock_bh(&sk->sk_callback_lock); 5716ed7257bSPatrick Caulfield } 5726ed7257bSPatrick Caulfield 5736ed7257bSPatrick Caulfield /* Add the port number to an IPv6 or 4 sockaddr and return the address 5746ed7257bSPatrick Caulfield length */ 5756ed7257bSPatrick Caulfield static void make_sockaddr(struct sockaddr_storage *saddr, uint16_t port, 5766ed7257bSPatrick Caulfield int *addr_len) 5776ed7257bSPatrick Caulfield { 5786ed7257bSPatrick Caulfield saddr->ss_family = dlm_local_addr[0]->ss_family; 5796ed7257bSPatrick Caulfield if (saddr->ss_family == AF_INET) { 5806ed7257bSPatrick Caulfield struct sockaddr_in *in4_addr = (struct sockaddr_in *)saddr; 5816ed7257bSPatrick Caulfield in4_addr->sin_port = cpu_to_be16(port); 5826ed7257bSPatrick Caulfield *addr_len = sizeof(struct sockaddr_in); 5836ed7257bSPatrick Caulfield memset(&in4_addr->sin_zero, 0, sizeof(in4_addr->sin_zero)); 5846ed7257bSPatrick Caulfield } else { 5856ed7257bSPatrick Caulfield struct sockaddr_in6 *in6_addr = (struct sockaddr_in6 *)saddr; 5866ed7257bSPatrick Caulfield in6_addr->sin6_port = cpu_to_be16(port); 5876ed7257bSPatrick Caulfield *addr_len = sizeof(struct sockaddr_in6); 5886ed7257bSPatrick Caulfield } 58901c8cab2SPatrick Caulfield memset((char *)saddr + *addr_len, 0, sizeof(struct sockaddr_storage) - *addr_len); 5906ed7257bSPatrick Caulfield } 5916ed7257bSPatrick Caulfield 5926ed7257bSPatrick Caulfield /* Close a remote connection and tidy up */ 5930d737a8cSMarcelo Ricardo Leitner static void close_connection(struct connection *con, bool and_other, 5940d737a8cSMarcelo Ricardo Leitner bool tx, bool rx) 5956ed7257bSPatrick Caulfield { 596b2a66629Stsutomu.owa@toshiba.co.jp bool closing = test_and_set_bit(CF_CLOSING, &con->flags); 597b2a66629Stsutomu.owa@toshiba.co.jp 5980aa18464Stsutomu.owa@toshiba.co.jp if (tx && !closing && cancel_work_sync(&con->swork)) { 5990d737a8cSMarcelo Ricardo Leitner log_print("canceled swork for node %d", con->nodeid); 6000aa18464Stsutomu.owa@toshiba.co.jp clear_bit(CF_WRITE_PENDING, &con->flags); 6010aa18464Stsutomu.owa@toshiba.co.jp } 6020aa18464Stsutomu.owa@toshiba.co.jp if (rx && !closing && cancel_work_sync(&con->rwork)) { 6030d737a8cSMarcelo Ricardo Leitner log_print("canceled rwork for node %d", con->nodeid); 6040aa18464Stsutomu.owa@toshiba.co.jp clear_bit(CF_READ_PENDING, &con->flags); 6050aa18464Stsutomu.owa@toshiba.co.jp } 6066ed7257bSPatrick Caulfield 6070d737a8cSMarcelo Ricardo Leitner mutex_lock(&con->sock_mutex); 6086ed7257bSPatrick Caulfield if (con->sock) { 609cc661fc9SBob Peterson restore_callbacks(con->sock); 6106ed7257bSPatrick Caulfield sock_release(con->sock); 6116ed7257bSPatrick Caulfield con->sock = NULL; 6126ed7257bSPatrick Caulfield } 6136ed7257bSPatrick Caulfield if (con->othercon && and_other) { 6146ed7257bSPatrick Caulfield /* Will only re-enter once. */ 6150d737a8cSMarcelo Ricardo Leitner close_connection(con->othercon, false, true, true); 6166ed7257bSPatrick Caulfield } 6176ed7257bSPatrick Caulfield if (con->rx_page) { 6186ed7257bSPatrick Caulfield __free_page(con->rx_page); 6196ed7257bSPatrick Caulfield con->rx_page = NULL; 6206ed7257bSPatrick Caulfield } 6219e5f2825SPatrick Caulfield 6226ed7257bSPatrick Caulfield con->retries = 0; 6236ed7257bSPatrick Caulfield mutex_unlock(&con->sock_mutex); 624b2a66629Stsutomu.owa@toshiba.co.jp clear_bit(CF_CLOSING, &con->flags); 6256ed7257bSPatrick Caulfield } 6266ed7257bSPatrick Caulfield 627055923bfSAlexander Aring static void shutdown_connection(struct connection *con) 628055923bfSAlexander Aring { 629055923bfSAlexander Aring int ret; 630055923bfSAlexander Aring 631055923bfSAlexander Aring if (cancel_work_sync(&con->swork)) { 632055923bfSAlexander Aring log_print("canceled swork for node %d", con->nodeid); 633055923bfSAlexander Aring clear_bit(CF_WRITE_PENDING, &con->flags); 634055923bfSAlexander Aring } 635055923bfSAlexander Aring 636055923bfSAlexander Aring mutex_lock(&con->sock_mutex); 637055923bfSAlexander Aring /* nothing to shutdown */ 638055923bfSAlexander Aring if (!con->sock) { 639055923bfSAlexander Aring mutex_unlock(&con->sock_mutex); 640055923bfSAlexander Aring return; 641055923bfSAlexander Aring } 642055923bfSAlexander Aring 643055923bfSAlexander Aring set_bit(CF_SHUTDOWN, &con->flags); 644055923bfSAlexander Aring ret = kernel_sock_shutdown(con->sock, SHUT_WR); 645055923bfSAlexander Aring mutex_unlock(&con->sock_mutex); 646055923bfSAlexander Aring if (ret) { 647055923bfSAlexander Aring log_print("Connection %p failed to shutdown: %d will force close", 648055923bfSAlexander Aring con, ret); 649055923bfSAlexander Aring goto force_close; 650055923bfSAlexander Aring } else { 651055923bfSAlexander Aring ret = wait_event_timeout(con->shutdown_wait, 652055923bfSAlexander Aring !test_bit(CF_SHUTDOWN, &con->flags), 653055923bfSAlexander Aring DLM_SHUTDOWN_WAIT_TIMEOUT); 654055923bfSAlexander Aring if (ret == 0) { 655055923bfSAlexander Aring log_print("Connection %p shutdown timed out, will force close", 656055923bfSAlexander Aring con); 657055923bfSAlexander Aring goto force_close; 658055923bfSAlexander Aring } 659055923bfSAlexander Aring } 660055923bfSAlexander Aring 661055923bfSAlexander Aring return; 662055923bfSAlexander Aring 663055923bfSAlexander Aring force_close: 664055923bfSAlexander Aring clear_bit(CF_SHUTDOWN, &con->flags); 665055923bfSAlexander Aring close_connection(con, false, true, true); 666055923bfSAlexander Aring } 667055923bfSAlexander Aring 668055923bfSAlexander Aring static void dlm_tcp_shutdown(struct connection *con) 669055923bfSAlexander Aring { 670055923bfSAlexander Aring if (con->othercon) 671055923bfSAlexander Aring shutdown_connection(con->othercon); 672055923bfSAlexander Aring shutdown_connection(con); 673055923bfSAlexander Aring } 674055923bfSAlexander Aring 6756ed7257bSPatrick Caulfield /* Data received from remote end */ 6766ed7257bSPatrick Caulfield static int receive_from_sock(struct connection *con) 6776ed7257bSPatrick Caulfield { 6786ed7257bSPatrick Caulfield int ret = 0; 6796ed7257bSPatrick Caulfield struct msghdr msg = {}; 6806ed7257bSPatrick Caulfield struct kvec iov[2]; 6816ed7257bSPatrick Caulfield unsigned len; 6826ed7257bSPatrick Caulfield int r; 6836ed7257bSPatrick Caulfield int call_again_soon = 0; 6846ed7257bSPatrick Caulfield int nvec; 6856ed7257bSPatrick Caulfield 6866ed7257bSPatrick Caulfield mutex_lock(&con->sock_mutex); 6876ed7257bSPatrick Caulfield 6886ed7257bSPatrick Caulfield if (con->sock == NULL) { 6896ed7257bSPatrick Caulfield ret = -EAGAIN; 6906ed7257bSPatrick Caulfield goto out_close; 6916ed7257bSPatrick Caulfield } 692acee4e52SMarcelo Ricardo Leitner if (con->nodeid == 0) { 693acee4e52SMarcelo Ricardo Leitner ret = -EINVAL; 694acee4e52SMarcelo Ricardo Leitner goto out_close; 695acee4e52SMarcelo Ricardo Leitner } 6966ed7257bSPatrick Caulfield 6976ed7257bSPatrick Caulfield if (con->rx_page == NULL) { 6986ed7257bSPatrick Caulfield /* 6996ed7257bSPatrick Caulfield * This doesn't need to be atomic, but I think it should 7006ed7257bSPatrick Caulfield * improve performance if it is. 7016ed7257bSPatrick Caulfield */ 7026ed7257bSPatrick Caulfield con->rx_page = alloc_page(GFP_ATOMIC); 7036ed7257bSPatrick Caulfield if (con->rx_page == NULL) 7046ed7257bSPatrick Caulfield goto out_resched; 70509cbfeafSKirill A. Shutemov cbuf_init(&con->cb, PAGE_SIZE); 7066ed7257bSPatrick Caulfield } 7076ed7257bSPatrick Caulfield 7086ed7257bSPatrick Caulfield /* 7096ed7257bSPatrick Caulfield * iov[0] is the bit of the circular buffer between the current end 7106ed7257bSPatrick Caulfield * point (cb.base + cb.len) and the end of the buffer. 7116ed7257bSPatrick Caulfield */ 7126ed7257bSPatrick Caulfield iov[0].iov_len = con->cb.base - cbuf_data(&con->cb); 7136ed7257bSPatrick Caulfield iov[0].iov_base = page_address(con->rx_page) + cbuf_data(&con->cb); 7146ed7257bSPatrick Caulfield iov[1].iov_len = 0; 7156ed7257bSPatrick Caulfield nvec = 1; 7166ed7257bSPatrick Caulfield 7176ed7257bSPatrick Caulfield /* 7186ed7257bSPatrick Caulfield * iov[1] is the bit of the circular buffer between the start of the 7196ed7257bSPatrick Caulfield * buffer and the start of the currently used section (cb.base) 7206ed7257bSPatrick Caulfield */ 7216ed7257bSPatrick Caulfield if (cbuf_data(&con->cb) >= con->cb.base) { 72209cbfeafSKirill A. Shutemov iov[0].iov_len = PAGE_SIZE - cbuf_data(&con->cb); 7236ed7257bSPatrick Caulfield iov[1].iov_len = con->cb.base; 7246ed7257bSPatrick Caulfield iov[1].iov_base = page_address(con->rx_page); 7256ed7257bSPatrick Caulfield nvec = 2; 7266ed7257bSPatrick Caulfield } 7276ed7257bSPatrick Caulfield len = iov[0].iov_len + iov[1].iov_len; 728aa563d7bSDavid Howells iov_iter_kvec(&msg.msg_iter, READ, iov, nvec, len); 7296ed7257bSPatrick Caulfield 730c8c7840eSAl Viro r = ret = sock_recvmsg(con->sock, &msg, MSG_DONTWAIT | MSG_NOSIGNAL); 7316ed7257bSPatrick Caulfield if (ret <= 0) 7326ed7257bSPatrick Caulfield goto out_close; 733ee44b4bcSMarcelo Ricardo Leitner else if (ret == len) 734ee44b4bcSMarcelo Ricardo Leitner call_again_soon = 1; 7356ed7257bSPatrick Caulfield 7366ed7257bSPatrick Caulfield cbuf_add(&con->cb, ret); 7376ed7257bSPatrick Caulfield ret = dlm_process_incoming_buffer(con->nodeid, 7386ed7257bSPatrick Caulfield page_address(con->rx_page), 7396ed7257bSPatrick Caulfield con->cb.base, con->cb.len, 74009cbfeafSKirill A. Shutemov PAGE_SIZE); 7410ea47e4dSAlexander Aring if (ret < 0) { 7420ea47e4dSAlexander Aring log_print("lowcomms err %d: addr=%p, base=%u, len=%u, read=%d", 7430ea47e4dSAlexander Aring ret, page_address(con->rx_page), con->cb.base, 744ee44b4bcSMarcelo Ricardo Leitner con->cb.len, r); 7450ea47e4dSAlexander Aring cbuf_eat(&con->cb, r); 7460ea47e4dSAlexander Aring } else { 7476ed7257bSPatrick Caulfield cbuf_eat(&con->cb, ret); 7480ea47e4dSAlexander Aring } 7496ed7257bSPatrick Caulfield 7506ed7257bSPatrick Caulfield if (cbuf_empty(&con->cb) && !call_again_soon) { 7516ed7257bSPatrick Caulfield __free_page(con->rx_page); 7526ed7257bSPatrick Caulfield con->rx_page = NULL; 7536ed7257bSPatrick Caulfield } 7546ed7257bSPatrick Caulfield 7556ed7257bSPatrick Caulfield if (call_again_soon) 7566ed7257bSPatrick Caulfield goto out_resched; 7576ed7257bSPatrick Caulfield mutex_unlock(&con->sock_mutex); 7586ed7257bSPatrick Caulfield return 0; 7596ed7257bSPatrick Caulfield 7606ed7257bSPatrick Caulfield out_resched: 7616ed7257bSPatrick Caulfield if (!test_and_set_bit(CF_READ_PENDING, &con->flags)) 7626ed7257bSPatrick Caulfield queue_work(recv_workqueue, &con->rwork); 7636ed7257bSPatrick Caulfield mutex_unlock(&con->sock_mutex); 7646ed7257bSPatrick Caulfield return -EAGAIN; 7656ed7257bSPatrick Caulfield 7666ed7257bSPatrick Caulfield out_close: 7676ed7257bSPatrick Caulfield mutex_unlock(&con->sock_mutex); 7689e5f2825SPatrick Caulfield if (ret != -EAGAIN) { 7696ed7257bSPatrick Caulfield /* Reconnect when there is something to send */ 770055923bfSAlexander Aring close_connection(con, false, true, false); 771055923bfSAlexander Aring if (ret == 0) { 772055923bfSAlexander Aring log_print("connection %p got EOF from %d", 773055923bfSAlexander Aring con, con->nodeid); 774055923bfSAlexander Aring /* handling for tcp shutdown */ 775055923bfSAlexander Aring clear_bit(CF_SHUTDOWN, &con->flags); 776055923bfSAlexander Aring wake_up(&con->shutdown_wait); 777055923bfSAlexander Aring /* signal to breaking receive worker */ 778055923bfSAlexander Aring ret = -1; 7796ed7257bSPatrick Caulfield } 780055923bfSAlexander Aring } 7816ed7257bSPatrick Caulfield return ret; 7826ed7257bSPatrick Caulfield } 7836ed7257bSPatrick Caulfield 7846ed7257bSPatrick Caulfield /* Listening socket is busy, accept a connection */ 7850774dc76SChristoph Hellwig static int accept_from_sock(struct connection *con) 7866ed7257bSPatrick Caulfield { 7876ed7257bSPatrick Caulfield int result; 7886ed7257bSPatrick Caulfield struct sockaddr_storage peeraddr; 7896ed7257bSPatrick Caulfield struct socket *newsock; 7906ed7257bSPatrick Caulfield int len; 7916ed7257bSPatrick Caulfield int nodeid; 7926ed7257bSPatrick Caulfield struct connection *newcon; 7936ed7257bSPatrick Caulfield struct connection *addcon; 7946ed7257bSPatrick Caulfield 795513ef596SDavid Teigland mutex_lock(&connections_lock); 796513ef596SDavid Teigland if (!dlm_allow_conn) { 797513ef596SDavid Teigland mutex_unlock(&connections_lock); 798513ef596SDavid Teigland return -1; 799513ef596SDavid Teigland } 800513ef596SDavid Teigland mutex_unlock(&connections_lock); 801513ef596SDavid Teigland 8026ed7257bSPatrick Caulfield mutex_lock_nested(&con->sock_mutex, 0); 8036ed7257bSPatrick Caulfield 8043421fb15Stsutomu.owa@toshiba.co.jp if (!con->sock) { 8053421fb15Stsutomu.owa@toshiba.co.jp mutex_unlock(&con->sock_mutex); 8063421fb15Stsutomu.owa@toshiba.co.jp return -ENOTCONN; 8073421fb15Stsutomu.owa@toshiba.co.jp } 8086ed7257bSPatrick Caulfield 8093421fb15Stsutomu.owa@toshiba.co.jp result = kernel_accept(con->sock, &newsock, O_NONBLOCK); 8106ed7257bSPatrick Caulfield if (result < 0) 8116ed7257bSPatrick Caulfield goto accept_err; 8126ed7257bSPatrick Caulfield 8136ed7257bSPatrick Caulfield /* Get the connected socket's peer */ 8146ed7257bSPatrick Caulfield memset(&peeraddr, 0, sizeof(peeraddr)); 8159b2c45d4SDenys Vlasenko len = newsock->ops->getname(newsock, (struct sockaddr *)&peeraddr, 2); 8169b2c45d4SDenys Vlasenko if (len < 0) { 8176ed7257bSPatrick Caulfield result = -ECONNABORTED; 8186ed7257bSPatrick Caulfield goto accept_err; 8196ed7257bSPatrick Caulfield } 8206ed7257bSPatrick Caulfield 8216ed7257bSPatrick Caulfield /* Get the new node's NODEID */ 8226ed7257bSPatrick Caulfield make_sockaddr(&peeraddr, 0, &len); 82336b71a8bSDavid Teigland if (addr_to_nodeid(&peeraddr, &nodeid)) { 824bcaadf5cSMasatake YAMATO unsigned char *b=(unsigned char *)&peeraddr; 825617e82e1SDavid Teigland log_print("connect from non cluster node"); 826bcaadf5cSMasatake YAMATO print_hex_dump_bytes("ss: ", DUMP_PREFIX_NONE, 827bcaadf5cSMasatake YAMATO b, sizeof(struct sockaddr_storage)); 8286ed7257bSPatrick Caulfield sock_release(newsock); 8296ed7257bSPatrick Caulfield mutex_unlock(&con->sock_mutex); 8306ed7257bSPatrick Caulfield return -1; 8316ed7257bSPatrick Caulfield } 8326ed7257bSPatrick Caulfield 8336ed7257bSPatrick Caulfield log_print("got connection from %d", nodeid); 8346ed7257bSPatrick Caulfield 8356ed7257bSPatrick Caulfield /* Check to see if we already have a connection to this node. This 8366ed7257bSPatrick Caulfield * could happen if the two nodes initiate a connection at roughly 8376ed7257bSPatrick Caulfield * the same time and the connections cross on the wire. 8386ed7257bSPatrick Caulfield * In this case we store the incoming one in "othercon" 8396ed7257bSPatrick Caulfield */ 840748285ccSDavid Teigland newcon = nodeid2con(nodeid, GFP_NOFS); 8416ed7257bSPatrick Caulfield if (!newcon) { 8426ed7257bSPatrick Caulfield result = -ENOMEM; 8436ed7257bSPatrick Caulfield goto accept_err; 8446ed7257bSPatrick Caulfield } 8456ed7257bSPatrick Caulfield mutex_lock_nested(&newcon->sock_mutex, 1); 8466ed7257bSPatrick Caulfield if (newcon->sock) { 8476ed7257bSPatrick Caulfield struct connection *othercon = newcon->othercon; 8486ed7257bSPatrick Caulfield 8496ed7257bSPatrick Caulfield if (!othercon) { 850748285ccSDavid Teigland othercon = kmem_cache_zalloc(con_cache, GFP_NOFS); 8516ed7257bSPatrick Caulfield if (!othercon) { 852617e82e1SDavid Teigland log_print("failed to allocate incoming socket"); 8536ed7257bSPatrick Caulfield mutex_unlock(&newcon->sock_mutex); 8546ed7257bSPatrick Caulfield result = -ENOMEM; 8556ed7257bSPatrick Caulfield goto accept_err; 8566ed7257bSPatrick Caulfield } 8576ed7257bSPatrick Caulfield othercon->nodeid = nodeid; 8586ed7257bSPatrick Caulfield othercon->rx_action = receive_from_sock; 8596ed7257bSPatrick Caulfield mutex_init(&othercon->sock_mutex); 86026b41099Stsutomu.owa@toshiba.co.jp INIT_LIST_HEAD(&othercon->writequeue); 86126b41099Stsutomu.owa@toshiba.co.jp spin_lock_init(&othercon->writequeue_lock); 8626ed7257bSPatrick Caulfield INIT_WORK(&othercon->swork, process_send_sockets); 8636ed7257bSPatrick Caulfield INIT_WORK(&othercon->rwork, process_recv_sockets); 864055923bfSAlexander Aring init_waitqueue_head(&othercon->shutdown_wait); 8656ed7257bSPatrick Caulfield set_bit(CF_IS_OTHERCON, &othercon->flags); 866ba3ab3caSAlexander Aring } else { 867ba3ab3caSAlexander Aring /* close other sock con if we have something new */ 868ba3ab3caSAlexander Aring close_connection(othercon, false, true, false); 86961d96be0SPatrick Caulfield } 870ba3ab3caSAlexander Aring 871c7355827Stsutomu.owa@toshiba.co.jp mutex_lock_nested(&othercon->sock_mutex, 2); 8726ed7257bSPatrick Caulfield newcon->othercon = othercon; 873988419a9Stsutomu.owa@toshiba.co.jp add_sock(newsock, othercon); 8746ed7257bSPatrick Caulfield addcon = othercon; 875c7355827Stsutomu.owa@toshiba.co.jp mutex_unlock(&othercon->sock_mutex); 8766ed7257bSPatrick Caulfield } 8776ed7257bSPatrick Caulfield else { 8786ed7257bSPatrick Caulfield newcon->rx_action = receive_from_sock; 8793735b4b9SBob Peterson /* accept copies the sk after we've saved the callbacks, so we 8803735b4b9SBob Peterson don't want to save them a second time or comm errors will 8813735b4b9SBob Peterson result in calling sk_error_report recursively. */ 882988419a9Stsutomu.owa@toshiba.co.jp add_sock(newsock, newcon); 8836ed7257bSPatrick Caulfield addcon = newcon; 8846ed7257bSPatrick Caulfield } 8856ed7257bSPatrick Caulfield 8866ed7257bSPatrick Caulfield mutex_unlock(&newcon->sock_mutex); 8876ed7257bSPatrick Caulfield 8886ed7257bSPatrick Caulfield /* 8896ed7257bSPatrick Caulfield * Add it to the active queue in case we got data 89025985edcSLucas De Marchi * between processing the accept adding the socket 8916ed7257bSPatrick Caulfield * to the read_sockets list 8926ed7257bSPatrick Caulfield */ 8936ed7257bSPatrick Caulfield if (!test_and_set_bit(CF_READ_PENDING, &addcon->flags)) 8946ed7257bSPatrick Caulfield queue_work(recv_workqueue, &addcon->rwork); 8956ed7257bSPatrick Caulfield mutex_unlock(&con->sock_mutex); 8966ed7257bSPatrick Caulfield 8976ed7257bSPatrick Caulfield return 0; 8986ed7257bSPatrick Caulfield 8996ed7257bSPatrick Caulfield accept_err: 9006ed7257bSPatrick Caulfield mutex_unlock(&con->sock_mutex); 9013421fb15Stsutomu.owa@toshiba.co.jp if (newsock) 9026ed7257bSPatrick Caulfield sock_release(newsock); 9036ed7257bSPatrick Caulfield 9046ed7257bSPatrick Caulfield if (result != -EAGAIN) 905617e82e1SDavid Teigland log_print("error accepting connection from node: %d", result); 9066ed7257bSPatrick Caulfield return result; 9076ed7257bSPatrick Caulfield } 9086ed7257bSPatrick Caulfield 9096ed7257bSPatrick Caulfield static void free_entry(struct writequeue_entry *e) 9106ed7257bSPatrick Caulfield { 9116ed7257bSPatrick Caulfield __free_page(e->page); 9126ed7257bSPatrick Caulfield kfree(e); 9136ed7257bSPatrick Caulfield } 9146ed7257bSPatrick Caulfield 9155d689871SMike Christie /* 9165d689871SMike Christie * writequeue_entry_complete - try to delete and free write queue entry 9175d689871SMike Christie * @e: write queue entry to try to delete 9185d689871SMike Christie * @completed: bytes completed 9195d689871SMike Christie * 9205d689871SMike Christie * writequeue_lock must be held. 9215d689871SMike Christie */ 9225d689871SMike Christie static void writequeue_entry_complete(struct writequeue_entry *e, int completed) 9235d689871SMike Christie { 9245d689871SMike Christie e->offset += completed; 9255d689871SMike Christie e->len -= completed; 9265d689871SMike Christie 9275d689871SMike Christie if (e->len == 0 && e->users == 0) { 9285d689871SMike Christie list_del(&e->list); 9295d689871SMike Christie free_entry(e); 9305d689871SMike Christie } 9315d689871SMike Christie } 9325d689871SMike Christie 933ee44b4bcSMarcelo Ricardo Leitner /* 934ee44b4bcSMarcelo Ricardo Leitner * sctp_bind_addrs - bind a SCTP socket to all our addresses 935ee44b4bcSMarcelo Ricardo Leitner */ 936ee44b4bcSMarcelo Ricardo Leitner static int sctp_bind_addrs(struct connection *con, uint16_t port) 937ee44b4bcSMarcelo Ricardo Leitner { 938ee44b4bcSMarcelo Ricardo Leitner struct sockaddr_storage localaddr; 939c0425a42SChristoph Hellwig struct sockaddr *addr = (struct sockaddr *)&localaddr; 940ee44b4bcSMarcelo Ricardo Leitner int i, addr_len, result = 0; 941ee44b4bcSMarcelo Ricardo Leitner 942ee44b4bcSMarcelo Ricardo Leitner for (i = 0; i < dlm_local_count; i++) { 943ee44b4bcSMarcelo Ricardo Leitner memcpy(&localaddr, dlm_local_addr[i], sizeof(localaddr)); 944ee44b4bcSMarcelo Ricardo Leitner make_sockaddr(&localaddr, port, &addr_len); 945ee44b4bcSMarcelo Ricardo Leitner 946ee44b4bcSMarcelo Ricardo Leitner if (!i) 947c0425a42SChristoph Hellwig result = kernel_bind(con->sock, addr, addr_len); 948ee44b4bcSMarcelo Ricardo Leitner else 949c0425a42SChristoph Hellwig result = sock_bind_add(con->sock->sk, addr, addr_len); 950ee44b4bcSMarcelo Ricardo Leitner 951ee44b4bcSMarcelo Ricardo Leitner if (result < 0) { 952ee44b4bcSMarcelo Ricardo Leitner log_print("Can't bind to %d addr number %d, %d.\n", 953ee44b4bcSMarcelo Ricardo Leitner port, i + 1, result); 954ee44b4bcSMarcelo Ricardo Leitner break; 955ee44b4bcSMarcelo Ricardo Leitner } 956ee44b4bcSMarcelo Ricardo Leitner } 957ee44b4bcSMarcelo Ricardo Leitner return result; 958ee44b4bcSMarcelo Ricardo Leitner } 959ee44b4bcSMarcelo Ricardo Leitner 9606ed7257bSPatrick Caulfield /* Initiate an SCTP association. 9616ed7257bSPatrick Caulfield This is a special case of send_to_sock() in that we don't yet have a 9626ed7257bSPatrick Caulfield peeled-off socket for this association, so we use the listening socket 9636ed7257bSPatrick Caulfield and add the primary IP address of the remote node. 9646ed7257bSPatrick Caulfield */ 965ee44b4bcSMarcelo Ricardo Leitner static void sctp_connect_to_sock(struct connection *con) 9666ed7257bSPatrick Caulfield { 967ee44b4bcSMarcelo Ricardo Leitner struct sockaddr_storage daddr; 968ee44b4bcSMarcelo Ricardo Leitner int result; 969ee44b4bcSMarcelo Ricardo Leitner int addr_len; 970ee44b4bcSMarcelo Ricardo Leitner struct socket *sock; 9719c9f168fSAlexander Aring unsigned int mark; 972ee44b4bcSMarcelo Ricardo Leitner 973ee44b4bcSMarcelo Ricardo Leitner if (con->nodeid == 0) { 974ee44b4bcSMarcelo Ricardo Leitner log_print("attempt to connect sock 0 foiled"); 975ee44b4bcSMarcelo Ricardo Leitner return; 976ee44b4bcSMarcelo Ricardo Leitner } 9776ed7257bSPatrick Caulfield 9785d689871SMike Christie mutex_lock(&con->sock_mutex); 9796ed7257bSPatrick Caulfield 980ee44b4bcSMarcelo Ricardo Leitner /* Some odd races can cause double-connects, ignore them */ 981ee44b4bcSMarcelo Ricardo Leitner if (con->retries++ > MAX_CONNECT_RETRIES) 982ee44b4bcSMarcelo Ricardo Leitner goto out; 983ee44b4bcSMarcelo Ricardo Leitner 984ee44b4bcSMarcelo Ricardo Leitner if (con->sock) { 985ee44b4bcSMarcelo Ricardo Leitner log_print("node %d already connected.", con->nodeid); 986ee44b4bcSMarcelo Ricardo Leitner goto out; 987ee44b4bcSMarcelo Ricardo Leitner } 988ee44b4bcSMarcelo Ricardo Leitner 989ee44b4bcSMarcelo Ricardo Leitner memset(&daddr, 0, sizeof(daddr)); 990ee44b4bcSMarcelo Ricardo Leitner result = nodeid_to_addr(con->nodeid, &daddr, NULL, true); 991ee44b4bcSMarcelo Ricardo Leitner if (result < 0) { 9926ed7257bSPatrick Caulfield log_print("no address for nodeid %d", con->nodeid); 993ee44b4bcSMarcelo Ricardo Leitner goto out; 99404bedd79SDavid Teigland } 9956ed7257bSPatrick Caulfield 996ee44b4bcSMarcelo Ricardo Leitner /* Create a socket to communicate with */ 997ee44b4bcSMarcelo Ricardo Leitner result = sock_create_kern(&init_net, dlm_local_addr[0]->ss_family, 998ee44b4bcSMarcelo Ricardo Leitner SOCK_STREAM, IPPROTO_SCTP, &sock); 999ee44b4bcSMarcelo Ricardo Leitner if (result < 0) 1000ee44b4bcSMarcelo Ricardo Leitner goto socket_err; 10016ed7257bSPatrick Caulfield 10029c9f168fSAlexander Aring /* set skb mark */ 10039c9f168fSAlexander Aring result = dlm_comm_mark(con->nodeid, &mark); 10049c9f168fSAlexander Aring if (result < 0) 10059c9f168fSAlexander Aring goto bind_err; 10069c9f168fSAlexander Aring 10079c9f168fSAlexander Aring sock_set_mark(sock->sk, mark); 10089c9f168fSAlexander Aring 1009ee44b4bcSMarcelo Ricardo Leitner con->rx_action = receive_from_sock; 1010ee44b4bcSMarcelo Ricardo Leitner con->connect_action = sctp_connect_to_sock; 1011988419a9Stsutomu.owa@toshiba.co.jp add_sock(sock, con); 10126ed7257bSPatrick Caulfield 1013ee44b4bcSMarcelo Ricardo Leitner /* Bind to all addresses. */ 1014ee44b4bcSMarcelo Ricardo Leitner if (sctp_bind_addrs(con, 0)) 1015ee44b4bcSMarcelo Ricardo Leitner goto bind_err; 101698e1b60eSMike Christie 1017ee44b4bcSMarcelo Ricardo Leitner make_sockaddr(&daddr, dlm_config.ci_tcp_port, &addr_len); 10186ed7257bSPatrick Caulfield 1019ee44b4bcSMarcelo Ricardo Leitner log_print("connecting to %d", con->nodeid); 10206ed7257bSPatrick Caulfield 1021ee44b4bcSMarcelo Ricardo Leitner /* Turn off Nagle's algorithm */ 102240ef92c6SChristoph Hellwig sctp_sock_set_nodelay(sock->sk); 1023ee44b4bcSMarcelo Ricardo Leitner 1024f706d830SGang He /* 1025f706d830SGang He * Make sock->ops->connect() function return in specified time, 1026f706d830SGang He * since O_NONBLOCK argument in connect() function does not work here, 1027f706d830SGang He * then, we should restore the default value of this attribute. 1028f706d830SGang He */ 102976ee0785SChristoph Hellwig sock_set_sndtimeo(sock->sk, 5); 1030ee44b4bcSMarcelo Ricardo Leitner result = sock->ops->connect(sock, (struct sockaddr *)&daddr, addr_len, 1031da3627c3SGang He 0); 103276ee0785SChristoph Hellwig sock_set_sndtimeo(sock->sk, 0); 1033f706d830SGang He 1034ee44b4bcSMarcelo Ricardo Leitner if (result == -EINPROGRESS) 1035ee44b4bcSMarcelo Ricardo Leitner result = 0; 1036ee44b4bcSMarcelo Ricardo Leitner if (result == 0) 1037ee44b4bcSMarcelo Ricardo Leitner goto out; 1038ee44b4bcSMarcelo Ricardo Leitner 1039ee44b4bcSMarcelo Ricardo Leitner bind_err: 1040ee44b4bcSMarcelo Ricardo Leitner con->sock = NULL; 1041ee44b4bcSMarcelo Ricardo Leitner sock_release(sock); 1042ee44b4bcSMarcelo Ricardo Leitner 1043ee44b4bcSMarcelo Ricardo Leitner socket_err: 1044ee44b4bcSMarcelo Ricardo Leitner /* 1045ee44b4bcSMarcelo Ricardo Leitner * Some errors are fatal and this list might need adjusting. For other 1046ee44b4bcSMarcelo Ricardo Leitner * errors we try again until the max number of retries is reached. 1047ee44b4bcSMarcelo Ricardo Leitner */ 1048ee44b4bcSMarcelo Ricardo Leitner if (result != -EHOSTUNREACH && 1049ee44b4bcSMarcelo Ricardo Leitner result != -ENETUNREACH && 1050ee44b4bcSMarcelo Ricardo Leitner result != -ENETDOWN && 1051ee44b4bcSMarcelo Ricardo Leitner result != -EINVAL && 1052ee44b4bcSMarcelo Ricardo Leitner result != -EPROTONOSUPPORT) { 1053ee44b4bcSMarcelo Ricardo Leitner log_print("connect %d try %d error %d", con->nodeid, 1054ee44b4bcSMarcelo Ricardo Leitner con->retries, result); 1055ee44b4bcSMarcelo Ricardo Leitner mutex_unlock(&con->sock_mutex); 1056ee44b4bcSMarcelo Ricardo Leitner msleep(1000); 1057ee44b4bcSMarcelo Ricardo Leitner lowcomms_connect_sock(con); 1058ee44b4bcSMarcelo Ricardo Leitner return; 10596ed7257bSPatrick Caulfield } 10605d689871SMike Christie 1061ee44b4bcSMarcelo Ricardo Leitner out: 10625d689871SMike Christie mutex_unlock(&con->sock_mutex); 10636ed7257bSPatrick Caulfield } 10646ed7257bSPatrick Caulfield 10656ed7257bSPatrick Caulfield /* Connect a new socket to its peer */ 10666ed7257bSPatrick Caulfield static void tcp_connect_to_sock(struct connection *con) 10676ed7257bSPatrick Caulfield { 10686bd8fedaSLon Hohberger struct sockaddr_storage saddr, src_addr; 10696ed7257bSPatrick Caulfield int addr_len; 1070a89d63a1SCasey Dahlin struct socket *sock = NULL; 10719c9f168fSAlexander Aring unsigned int mark; 107236b71a8bSDavid Teigland int result; 10736ed7257bSPatrick Caulfield 10746ed7257bSPatrick Caulfield if (con->nodeid == 0) { 10756ed7257bSPatrick Caulfield log_print("attempt to connect sock 0 foiled"); 10766ed7257bSPatrick Caulfield return; 10776ed7257bSPatrick Caulfield } 10786ed7257bSPatrick Caulfield 10796ed7257bSPatrick Caulfield mutex_lock(&con->sock_mutex); 10806ed7257bSPatrick Caulfield if (con->retries++ > MAX_CONNECT_RETRIES) 10816ed7257bSPatrick Caulfield goto out; 10826ed7257bSPatrick Caulfield 10836ed7257bSPatrick Caulfield /* Some odd races can cause double-connects, ignore them */ 108436b71a8bSDavid Teigland if (con->sock) 10856ed7257bSPatrick Caulfield goto out; 10866ed7257bSPatrick Caulfield 10876ed7257bSPatrick Caulfield /* Create a socket to communicate with */ 1088eeb1bd5cSEric W. Biederman result = sock_create_kern(&init_net, dlm_local_addr[0]->ss_family, 1089eeb1bd5cSEric W. Biederman SOCK_STREAM, IPPROTO_TCP, &sock); 10906ed7257bSPatrick Caulfield if (result < 0) 10916ed7257bSPatrick Caulfield goto out_err; 10926ed7257bSPatrick Caulfield 10939c9f168fSAlexander Aring /* set skb mark */ 10949c9f168fSAlexander Aring result = dlm_comm_mark(con->nodeid, &mark); 10959c9f168fSAlexander Aring if (result < 0) 10969c9f168fSAlexander Aring goto out_err; 10979c9f168fSAlexander Aring 10989c9f168fSAlexander Aring sock_set_mark(sock->sk, mark); 10999c9f168fSAlexander Aring 11006ed7257bSPatrick Caulfield memset(&saddr, 0, sizeof(saddr)); 110198e1b60eSMike Christie result = nodeid_to_addr(con->nodeid, &saddr, NULL, false); 110236b71a8bSDavid Teigland if (result < 0) { 110336b71a8bSDavid Teigland log_print("no address for nodeid %d", con->nodeid); 11046ed7257bSPatrick Caulfield goto out_err; 110536b71a8bSDavid Teigland } 11066ed7257bSPatrick Caulfield 11076ed7257bSPatrick Caulfield con->rx_action = receive_from_sock; 11086ed7257bSPatrick Caulfield con->connect_action = tcp_connect_to_sock; 1109055923bfSAlexander Aring con->shutdown_action = dlm_tcp_shutdown; 1110988419a9Stsutomu.owa@toshiba.co.jp add_sock(sock, con); 11116ed7257bSPatrick Caulfield 11126bd8fedaSLon Hohberger /* Bind to our cluster-known address connecting to avoid 11136bd8fedaSLon Hohberger routing problems */ 11146bd8fedaSLon Hohberger memcpy(&src_addr, dlm_local_addr[0], sizeof(src_addr)); 11156bd8fedaSLon Hohberger make_sockaddr(&src_addr, 0, &addr_len); 11166bd8fedaSLon Hohberger result = sock->ops->bind(sock, (struct sockaddr *) &src_addr, 11176bd8fedaSLon Hohberger addr_len); 11186bd8fedaSLon Hohberger if (result < 0) { 11196bd8fedaSLon Hohberger log_print("could not bind for connect: %d", result); 11206bd8fedaSLon Hohberger /* This *may* not indicate a critical error */ 11216bd8fedaSLon Hohberger } 11226bd8fedaSLon Hohberger 11236ed7257bSPatrick Caulfield make_sockaddr(&saddr, dlm_config.ci_tcp_port, &addr_len); 11246ed7257bSPatrick Caulfield 11256ed7257bSPatrick Caulfield log_print("connecting to %d", con->nodeid); 1126cb2d45daSDavid Teigland 1127cb2d45daSDavid Teigland /* Turn off Nagle's algorithm */ 112812abc5eeSChristoph Hellwig tcp_sock_set_nodelay(sock->sk); 1129cb2d45daSDavid Teigland 113036b71a8bSDavid Teigland result = sock->ops->connect(sock, (struct sockaddr *)&saddr, addr_len, 11316ed7257bSPatrick Caulfield O_NONBLOCK); 11326ed7257bSPatrick Caulfield if (result == -EINPROGRESS) 11336ed7257bSPatrick Caulfield result = 0; 11346ed7257bSPatrick Caulfield if (result == 0) 11356ed7257bSPatrick Caulfield goto out; 11366ed7257bSPatrick Caulfield 11376ed7257bSPatrick Caulfield out_err: 11386ed7257bSPatrick Caulfield if (con->sock) { 11396ed7257bSPatrick Caulfield sock_release(con->sock); 11406ed7257bSPatrick Caulfield con->sock = NULL; 1141a89d63a1SCasey Dahlin } else if (sock) { 1142a89d63a1SCasey Dahlin sock_release(sock); 11436ed7257bSPatrick Caulfield } 11446ed7257bSPatrick Caulfield /* 11456ed7257bSPatrick Caulfield * Some errors are fatal and this list might need adjusting. For other 11466ed7257bSPatrick Caulfield * errors we try again until the max number of retries is reached. 11476ed7257bSPatrick Caulfield */ 114836b71a8bSDavid Teigland if (result != -EHOSTUNREACH && 114936b71a8bSDavid Teigland result != -ENETUNREACH && 115036b71a8bSDavid Teigland result != -ENETDOWN && 115136b71a8bSDavid Teigland result != -EINVAL && 115236b71a8bSDavid Teigland result != -EPROTONOSUPPORT) { 115336b71a8bSDavid Teigland log_print("connect %d try %d error %d", con->nodeid, 115436b71a8bSDavid Teigland con->retries, result); 115536b71a8bSDavid Teigland mutex_unlock(&con->sock_mutex); 115636b71a8bSDavid Teigland msleep(1000); 11576ed7257bSPatrick Caulfield lowcomms_connect_sock(con); 115836b71a8bSDavid Teigland return; 11596ed7257bSPatrick Caulfield } 11606ed7257bSPatrick Caulfield out: 11616ed7257bSPatrick Caulfield mutex_unlock(&con->sock_mutex); 11626ed7257bSPatrick Caulfield return; 11636ed7257bSPatrick Caulfield } 11646ed7257bSPatrick Caulfield 11656ed7257bSPatrick Caulfield static struct socket *tcp_create_listen_sock(struct connection *con, 11666ed7257bSPatrick Caulfield struct sockaddr_storage *saddr) 11676ed7257bSPatrick Caulfield { 11686ed7257bSPatrick Caulfield struct socket *sock = NULL; 11696ed7257bSPatrick Caulfield int result = 0; 11706ed7257bSPatrick Caulfield int addr_len; 11716ed7257bSPatrick Caulfield 11726ed7257bSPatrick Caulfield if (dlm_local_addr[0]->ss_family == AF_INET) 11736ed7257bSPatrick Caulfield addr_len = sizeof(struct sockaddr_in); 11746ed7257bSPatrick Caulfield else 11756ed7257bSPatrick Caulfield addr_len = sizeof(struct sockaddr_in6); 11766ed7257bSPatrick Caulfield 11776ed7257bSPatrick Caulfield /* Create a socket to communicate with */ 1178eeb1bd5cSEric W. Biederman result = sock_create_kern(&init_net, dlm_local_addr[0]->ss_family, 1179eeb1bd5cSEric W. Biederman SOCK_STREAM, IPPROTO_TCP, &sock); 11806ed7257bSPatrick Caulfield if (result < 0) { 1181617e82e1SDavid Teigland log_print("Can't create listening comms socket"); 11826ed7257bSPatrick Caulfield goto create_out; 11836ed7257bSPatrick Caulfield } 11846ed7257bSPatrick Caulfield 1185a5b7ab63SAlexander Aring sock_set_mark(sock->sk, dlm_config.ci_mark); 1186a5b7ab63SAlexander Aring 1187cb2d45daSDavid Teigland /* Turn off Nagle's algorithm */ 118812abc5eeSChristoph Hellwig tcp_sock_set_nodelay(sock->sk); 1189cb2d45daSDavid Teigland 1190b58f0e8fSChristoph Hellwig sock_set_reuseaddr(sock->sk); 11916ed7257bSPatrick Caulfield 119293eaadebStsutomu.owa@toshiba.co.jp write_lock_bh(&sock->sk->sk_callback_lock); 1193b81171cbSBob Peterson sock->sk->sk_user_data = con; 1194cc661fc9SBob Peterson save_listen_callbacks(sock); 11950774dc76SChristoph Hellwig con->rx_action = accept_from_sock; 11966ed7257bSPatrick Caulfield con->connect_action = tcp_connect_to_sock; 119793eaadebStsutomu.owa@toshiba.co.jp write_unlock_bh(&sock->sk->sk_callback_lock); 11986ed7257bSPatrick Caulfield 11996ed7257bSPatrick Caulfield /* Bind to our port */ 12006ed7257bSPatrick Caulfield make_sockaddr(saddr, dlm_config.ci_tcp_port, &addr_len); 12016ed7257bSPatrick Caulfield result = sock->ops->bind(sock, (struct sockaddr *) saddr, addr_len); 12026ed7257bSPatrick Caulfield if (result < 0) { 1203617e82e1SDavid Teigland log_print("Can't bind to port %d", dlm_config.ci_tcp_port); 12046ed7257bSPatrick Caulfield sock_release(sock); 12056ed7257bSPatrick Caulfield sock = NULL; 12066ed7257bSPatrick Caulfield con->sock = NULL; 12076ed7257bSPatrick Caulfield goto create_out; 12086ed7257bSPatrick Caulfield } 1209ce3d9544SChristoph Hellwig sock_set_keepalive(sock->sk); 12106ed7257bSPatrick Caulfield 12116ed7257bSPatrick Caulfield result = sock->ops->listen(sock, 5); 12126ed7257bSPatrick Caulfield if (result < 0) { 1213617e82e1SDavid Teigland log_print("Can't listen on port %d", dlm_config.ci_tcp_port); 12146ed7257bSPatrick Caulfield sock_release(sock); 12156ed7257bSPatrick Caulfield sock = NULL; 12166ed7257bSPatrick Caulfield goto create_out; 12176ed7257bSPatrick Caulfield } 12186ed7257bSPatrick Caulfield 12196ed7257bSPatrick Caulfield create_out: 12206ed7257bSPatrick Caulfield return sock; 12216ed7257bSPatrick Caulfield } 12226ed7257bSPatrick Caulfield 12236ed7257bSPatrick Caulfield /* Get local addresses */ 12246ed7257bSPatrick Caulfield static void init_local(void) 12256ed7257bSPatrick Caulfield { 12266ed7257bSPatrick Caulfield struct sockaddr_storage sas, *addr; 12276ed7257bSPatrick Caulfield int i; 12286ed7257bSPatrick Caulfield 122930d3a237SPatrick Caulfield dlm_local_count = 0; 12301b189b88SDavid Teigland for (i = 0; i < DLM_MAX_ADDR_COUNT; i++) { 12316ed7257bSPatrick Caulfield if (dlm_our_addr(&sas, i)) 12326ed7257bSPatrick Caulfield break; 12336ed7257bSPatrick Caulfield 12345c93f56fSAmitoj Kaur Chawla addr = kmemdup(&sas, sizeof(*addr), GFP_NOFS); 12356ed7257bSPatrick Caulfield if (!addr) 12366ed7257bSPatrick Caulfield break; 12376ed7257bSPatrick Caulfield dlm_local_addr[dlm_local_count++] = addr; 12386ed7257bSPatrick Caulfield } 12396ed7257bSPatrick Caulfield } 12406ed7257bSPatrick Caulfield 12416ed7257bSPatrick Caulfield /* Initialise SCTP socket and bind to all interfaces */ 12426ed7257bSPatrick Caulfield static int sctp_listen_for_all(void) 12436ed7257bSPatrick Caulfield { 12446ed7257bSPatrick Caulfield struct socket *sock = NULL; 1245ee44b4bcSMarcelo Ricardo Leitner int result = -EINVAL; 1246573c24c4SDavid Teigland struct connection *con = nodeid2con(0, GFP_NOFS); 12476ed7257bSPatrick Caulfield 12486ed7257bSPatrick Caulfield if (!con) 12496ed7257bSPatrick Caulfield return -ENOMEM; 12506ed7257bSPatrick Caulfield 12516ed7257bSPatrick Caulfield log_print("Using SCTP for communications"); 12526ed7257bSPatrick Caulfield 1253eeb1bd5cSEric W. Biederman result = sock_create_kern(&init_net, dlm_local_addr[0]->ss_family, 1254ee44b4bcSMarcelo Ricardo Leitner SOCK_STREAM, IPPROTO_SCTP, &sock); 12556ed7257bSPatrick Caulfield if (result < 0) { 12566ed7257bSPatrick Caulfield log_print("Can't create comms socket, check SCTP is loaded"); 12576ed7257bSPatrick Caulfield goto out; 12586ed7257bSPatrick Caulfield } 12596ed7257bSPatrick Caulfield 126026cfabf9SChristoph Hellwig sock_set_rcvbuf(sock->sk, NEEDED_RMEM); 1261a5b7ab63SAlexander Aring sock_set_mark(sock->sk, dlm_config.ci_mark); 126240ef92c6SChristoph Hellwig sctp_sock_set_nodelay(sock->sk); 126386e92ad2SMike Christie 1264b81171cbSBob Peterson write_lock_bh(&sock->sk->sk_callback_lock); 12656ed7257bSPatrick Caulfield /* Init con struct */ 12666ed7257bSPatrick Caulfield sock->sk->sk_user_data = con; 1267cc661fc9SBob Peterson save_listen_callbacks(sock); 12686ed7257bSPatrick Caulfield con->sock = sock; 12696ed7257bSPatrick Caulfield con->sock->sk->sk_data_ready = lowcomms_data_ready; 12700774dc76SChristoph Hellwig con->rx_action = accept_from_sock; 1271ee44b4bcSMarcelo Ricardo Leitner con->connect_action = sctp_connect_to_sock; 12726ed7257bSPatrick Caulfield 1273b81171cbSBob Peterson write_unlock_bh(&sock->sk->sk_callback_lock); 1274b81171cbSBob Peterson 1275ee44b4bcSMarcelo Ricardo Leitner /* Bind to all addresses. */ 1276ee44b4bcSMarcelo Ricardo Leitner if (sctp_bind_addrs(con, dlm_config.ci_tcp_port)) 12776ed7257bSPatrick Caulfield goto create_delsock; 12786ed7257bSPatrick Caulfield 12796ed7257bSPatrick Caulfield result = sock->ops->listen(sock, 5); 12806ed7257bSPatrick Caulfield if (result < 0) { 12816ed7257bSPatrick Caulfield log_print("Can't set socket listening"); 12826ed7257bSPatrick Caulfield goto create_delsock; 12836ed7257bSPatrick Caulfield } 12846ed7257bSPatrick Caulfield 12856ed7257bSPatrick Caulfield return 0; 12866ed7257bSPatrick Caulfield 12876ed7257bSPatrick Caulfield create_delsock: 12886ed7257bSPatrick Caulfield sock_release(sock); 12896ed7257bSPatrick Caulfield con->sock = NULL; 12906ed7257bSPatrick Caulfield out: 12916ed7257bSPatrick Caulfield return result; 12926ed7257bSPatrick Caulfield } 12936ed7257bSPatrick Caulfield 12946ed7257bSPatrick Caulfield static int tcp_listen_for_all(void) 12956ed7257bSPatrick Caulfield { 12966ed7257bSPatrick Caulfield struct socket *sock = NULL; 1297573c24c4SDavid Teigland struct connection *con = nodeid2con(0, GFP_NOFS); 12986ed7257bSPatrick Caulfield int result = -EINVAL; 12996ed7257bSPatrick Caulfield 13006ed7257bSPatrick Caulfield if (!con) 13016ed7257bSPatrick Caulfield return -ENOMEM; 13026ed7257bSPatrick Caulfield 13036ed7257bSPatrick Caulfield /* We don't support multi-homed hosts */ 13046ed7257bSPatrick Caulfield if (dlm_local_addr[1] != NULL) { 1305617e82e1SDavid Teigland log_print("TCP protocol can't handle multi-homed hosts, " 1306617e82e1SDavid Teigland "try SCTP"); 13076ed7257bSPatrick Caulfield return -EINVAL; 13086ed7257bSPatrick Caulfield } 13096ed7257bSPatrick Caulfield 13106ed7257bSPatrick Caulfield log_print("Using TCP for communications"); 13116ed7257bSPatrick Caulfield 13126ed7257bSPatrick Caulfield sock = tcp_create_listen_sock(con, dlm_local_addr[0]); 13136ed7257bSPatrick Caulfield if (sock) { 1314988419a9Stsutomu.owa@toshiba.co.jp add_sock(sock, con); 13156ed7257bSPatrick Caulfield result = 0; 13166ed7257bSPatrick Caulfield } 13176ed7257bSPatrick Caulfield else { 13186ed7257bSPatrick Caulfield result = -EADDRINUSE; 13196ed7257bSPatrick Caulfield } 13206ed7257bSPatrick Caulfield 13216ed7257bSPatrick Caulfield return result; 13226ed7257bSPatrick Caulfield } 13236ed7257bSPatrick Caulfield 13246ed7257bSPatrick Caulfield 13256ed7257bSPatrick Caulfield 13266ed7257bSPatrick Caulfield static struct writequeue_entry *new_writequeue_entry(struct connection *con, 13276ed7257bSPatrick Caulfield gfp_t allocation) 13286ed7257bSPatrick Caulfield { 13296ed7257bSPatrick Caulfield struct writequeue_entry *entry; 13306ed7257bSPatrick Caulfield 13316ed7257bSPatrick Caulfield entry = kmalloc(sizeof(struct writequeue_entry), allocation); 13326ed7257bSPatrick Caulfield if (!entry) 13336ed7257bSPatrick Caulfield return NULL; 13346ed7257bSPatrick Caulfield 13356ed7257bSPatrick Caulfield entry->page = alloc_page(allocation); 13366ed7257bSPatrick Caulfield if (!entry->page) { 13376ed7257bSPatrick Caulfield kfree(entry); 13386ed7257bSPatrick Caulfield return NULL; 13396ed7257bSPatrick Caulfield } 13406ed7257bSPatrick Caulfield 13416ed7257bSPatrick Caulfield entry->offset = 0; 13426ed7257bSPatrick Caulfield entry->len = 0; 13436ed7257bSPatrick Caulfield entry->end = 0; 13446ed7257bSPatrick Caulfield entry->users = 0; 13456ed7257bSPatrick Caulfield entry->con = con; 13466ed7257bSPatrick Caulfield 13476ed7257bSPatrick Caulfield return entry; 13486ed7257bSPatrick Caulfield } 13496ed7257bSPatrick Caulfield 1350617e82e1SDavid Teigland void *dlm_lowcomms_get_buffer(int nodeid, int len, gfp_t allocation, char **ppc) 13516ed7257bSPatrick Caulfield { 13526ed7257bSPatrick Caulfield struct connection *con; 13536ed7257bSPatrick Caulfield struct writequeue_entry *e; 13546ed7257bSPatrick Caulfield int offset = 0; 13556ed7257bSPatrick Caulfield 13566ed7257bSPatrick Caulfield con = nodeid2con(nodeid, allocation); 13576ed7257bSPatrick Caulfield if (!con) 13586ed7257bSPatrick Caulfield return NULL; 13596ed7257bSPatrick Caulfield 13606ed7257bSPatrick Caulfield spin_lock(&con->writequeue_lock); 13616ed7257bSPatrick Caulfield e = list_entry(con->writequeue.prev, struct writequeue_entry, list); 13626ed7257bSPatrick Caulfield if ((&e->list == &con->writequeue) || 136309cbfeafSKirill A. Shutemov (PAGE_SIZE - e->end < len)) { 13646ed7257bSPatrick Caulfield e = NULL; 13656ed7257bSPatrick Caulfield } else { 13666ed7257bSPatrick Caulfield offset = e->end; 13676ed7257bSPatrick Caulfield e->end += len; 1368eeee2b5fSWei Yongjun e->users++; 13696ed7257bSPatrick Caulfield } 13706ed7257bSPatrick Caulfield spin_unlock(&con->writequeue_lock); 13716ed7257bSPatrick Caulfield 13726ed7257bSPatrick Caulfield if (e) { 13736ed7257bSPatrick Caulfield got_one: 13746ed7257bSPatrick Caulfield *ppc = page_address(e->page) + offset; 13756ed7257bSPatrick Caulfield return e; 13766ed7257bSPatrick Caulfield } 13776ed7257bSPatrick Caulfield 13786ed7257bSPatrick Caulfield e = new_writequeue_entry(con, allocation); 13796ed7257bSPatrick Caulfield if (e) { 13806ed7257bSPatrick Caulfield spin_lock(&con->writequeue_lock); 13816ed7257bSPatrick Caulfield offset = e->end; 13826ed7257bSPatrick Caulfield e->end += len; 1383eeee2b5fSWei Yongjun e->users++; 13846ed7257bSPatrick Caulfield list_add_tail(&e->list, &con->writequeue); 13856ed7257bSPatrick Caulfield spin_unlock(&con->writequeue_lock); 13866ed7257bSPatrick Caulfield goto got_one; 13876ed7257bSPatrick Caulfield } 13886ed7257bSPatrick Caulfield return NULL; 13896ed7257bSPatrick Caulfield } 13906ed7257bSPatrick Caulfield 13916ed7257bSPatrick Caulfield void dlm_lowcomms_commit_buffer(void *mh) 13926ed7257bSPatrick Caulfield { 13936ed7257bSPatrick Caulfield struct writequeue_entry *e = (struct writequeue_entry *)mh; 13946ed7257bSPatrick Caulfield struct connection *con = e->con; 13956ed7257bSPatrick Caulfield int users; 13966ed7257bSPatrick Caulfield 13976ed7257bSPatrick Caulfield spin_lock(&con->writequeue_lock); 13986ed7257bSPatrick Caulfield users = --e->users; 13996ed7257bSPatrick Caulfield if (users) 14006ed7257bSPatrick Caulfield goto out; 14016ed7257bSPatrick Caulfield e->len = e->end - e->offset; 14026ed7257bSPatrick Caulfield spin_unlock(&con->writequeue_lock); 14036ed7257bSPatrick Caulfield 14046ed7257bSPatrick Caulfield queue_work(send_workqueue, &con->swork); 14056ed7257bSPatrick Caulfield return; 14066ed7257bSPatrick Caulfield 14076ed7257bSPatrick Caulfield out: 14086ed7257bSPatrick Caulfield spin_unlock(&con->writequeue_lock); 14096ed7257bSPatrick Caulfield return; 14106ed7257bSPatrick Caulfield } 14116ed7257bSPatrick Caulfield 14126ed7257bSPatrick Caulfield /* Send a message */ 14136ed7257bSPatrick Caulfield static void send_to_sock(struct connection *con) 14146ed7257bSPatrick Caulfield { 14156ed7257bSPatrick Caulfield int ret = 0; 14166ed7257bSPatrick Caulfield const int msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL; 14176ed7257bSPatrick Caulfield struct writequeue_entry *e; 14186ed7257bSPatrick Caulfield int len, offset; 1419f92c8dd7SBob Peterson int count = 0; 14206ed7257bSPatrick Caulfield 14216ed7257bSPatrick Caulfield mutex_lock(&con->sock_mutex); 14226ed7257bSPatrick Caulfield if (con->sock == NULL) 14236ed7257bSPatrick Caulfield goto out_connect; 14246ed7257bSPatrick Caulfield 14256ed7257bSPatrick Caulfield spin_lock(&con->writequeue_lock); 14266ed7257bSPatrick Caulfield for (;;) { 14276ed7257bSPatrick Caulfield e = list_entry(con->writequeue.next, struct writequeue_entry, 14286ed7257bSPatrick Caulfield list); 14296ed7257bSPatrick Caulfield if ((struct list_head *) e == &con->writequeue) 14306ed7257bSPatrick Caulfield break; 14316ed7257bSPatrick Caulfield 14326ed7257bSPatrick Caulfield len = e->len; 14336ed7257bSPatrick Caulfield offset = e->offset; 14346ed7257bSPatrick Caulfield BUG_ON(len == 0 && e->users == 0); 14356ed7257bSPatrick Caulfield spin_unlock(&con->writequeue_lock); 14366ed7257bSPatrick Caulfield 14376ed7257bSPatrick Caulfield ret = 0; 14386ed7257bSPatrick Caulfield if (len) { 14391329e3f2SPaolo Bonzini ret = kernel_sendpage(con->sock, e->page, offset, len, 14406ed7257bSPatrick Caulfield msg_flags); 1441d66f8277SPatrick Caulfield if (ret == -EAGAIN || ret == 0) { 1442b36930ddSDavid Miller if (ret == -EAGAIN && 14439cd3e072SEric Dumazet test_bit(SOCKWQ_ASYNC_NOSPACE, &con->sock->flags) && 1444b36930ddSDavid Miller !test_and_set_bit(CF_APP_LIMITED, &con->flags)) { 1445b36930ddSDavid Miller /* Notify TCP that we're limited by the 1446b36930ddSDavid Miller * application window size. 1447b36930ddSDavid Miller */ 1448b36930ddSDavid Miller set_bit(SOCK_NOSPACE, &con->sock->flags); 1449b36930ddSDavid Miller con->sock->sk->sk_write_pending++; 1450b36930ddSDavid Miller } 1451d66f8277SPatrick Caulfield cond_resched(); 14526ed7257bSPatrick Caulfield goto out; 14539c5bef58SYing Xue } else if (ret < 0) 14546ed7257bSPatrick Caulfield goto send_error; 1455d66f8277SPatrick Caulfield } 1456f92c8dd7SBob Peterson 14576ed7257bSPatrick Caulfield /* Don't starve people filling buffers */ 1458f92c8dd7SBob Peterson if (++count >= MAX_SEND_MSG_COUNT) { 14596ed7257bSPatrick Caulfield cond_resched(); 1460f92c8dd7SBob Peterson count = 0; 1461f92c8dd7SBob Peterson } 14626ed7257bSPatrick Caulfield 14636ed7257bSPatrick Caulfield spin_lock(&con->writequeue_lock); 14645d689871SMike Christie writequeue_entry_complete(e, ret); 14656ed7257bSPatrick Caulfield } 14666ed7257bSPatrick Caulfield spin_unlock(&con->writequeue_lock); 14676ed7257bSPatrick Caulfield out: 14686ed7257bSPatrick Caulfield mutex_unlock(&con->sock_mutex); 14696ed7257bSPatrick Caulfield return; 14706ed7257bSPatrick Caulfield 14716ed7257bSPatrick Caulfield send_error: 14726ed7257bSPatrick Caulfield mutex_unlock(&con->sock_mutex); 1473ba3ab3caSAlexander Aring close_connection(con, false, false, true); 147401da24d3SBob Peterson /* Requeue the send work. When the work daemon runs again, it will try 147501da24d3SBob Peterson a new connection, then call this function again. */ 147601da24d3SBob Peterson queue_work(send_workqueue, &con->swork); 14776ed7257bSPatrick Caulfield return; 14786ed7257bSPatrick Caulfield 14796ed7257bSPatrick Caulfield out_connect: 14806ed7257bSPatrick Caulfield mutex_unlock(&con->sock_mutex); 148101da24d3SBob Peterson queue_work(send_workqueue, &con->swork); 148201da24d3SBob Peterson cond_resched(); 14836ed7257bSPatrick Caulfield } 14846ed7257bSPatrick Caulfield 14856ed7257bSPatrick Caulfield static void clean_one_writequeue(struct connection *con) 14866ed7257bSPatrick Caulfield { 14875e9ccc37SChristine Caulfield struct writequeue_entry *e, *safe; 14886ed7257bSPatrick Caulfield 14896ed7257bSPatrick Caulfield spin_lock(&con->writequeue_lock); 14905e9ccc37SChristine Caulfield list_for_each_entry_safe(e, safe, &con->writequeue, list) { 14916ed7257bSPatrick Caulfield list_del(&e->list); 14926ed7257bSPatrick Caulfield free_entry(e); 14936ed7257bSPatrick Caulfield } 14946ed7257bSPatrick Caulfield spin_unlock(&con->writequeue_lock); 14956ed7257bSPatrick Caulfield } 14966ed7257bSPatrick Caulfield 14976ed7257bSPatrick Caulfield /* Called from recovery when it knows that a node has 14986ed7257bSPatrick Caulfield left the cluster */ 14996ed7257bSPatrick Caulfield int dlm_lowcomms_close(int nodeid) 15006ed7257bSPatrick Caulfield { 15016ed7257bSPatrick Caulfield struct connection *con; 150236b71a8bSDavid Teigland struct dlm_node_addr *na; 15036ed7257bSPatrick Caulfield 15046ed7257bSPatrick Caulfield log_print("closing connection to node %d", nodeid); 15056ed7257bSPatrick Caulfield con = nodeid2con(nodeid, 0); 15066ed7257bSPatrick Caulfield if (con) { 1507063c4c99SLars Marowsky-Bree set_bit(CF_CLOSE, &con->flags); 15080d737a8cSMarcelo Ricardo Leitner close_connection(con, true, true, true); 15096ed7257bSPatrick Caulfield clean_one_writequeue(con); 15106ed7257bSPatrick Caulfield } 151136b71a8bSDavid Teigland 151236b71a8bSDavid Teigland spin_lock(&dlm_node_addrs_spin); 151336b71a8bSDavid Teigland na = find_node_addr(nodeid); 151436b71a8bSDavid Teigland if (na) { 151536b71a8bSDavid Teigland list_del(&na->list); 151636b71a8bSDavid Teigland while (na->addr_count--) 151736b71a8bSDavid Teigland kfree(na->addr[na->addr_count]); 151836b71a8bSDavid Teigland kfree(na); 151936b71a8bSDavid Teigland } 152036b71a8bSDavid Teigland spin_unlock(&dlm_node_addrs_spin); 152136b71a8bSDavid Teigland 15226ed7257bSPatrick Caulfield return 0; 15236ed7257bSPatrick Caulfield } 15246ed7257bSPatrick Caulfield 15256ed7257bSPatrick Caulfield /* Receive workqueue function */ 15266ed7257bSPatrick Caulfield static void process_recv_sockets(struct work_struct *work) 15276ed7257bSPatrick Caulfield { 15286ed7257bSPatrick Caulfield struct connection *con = container_of(work, struct connection, rwork); 15296ed7257bSPatrick Caulfield int err; 15306ed7257bSPatrick Caulfield 15316ed7257bSPatrick Caulfield clear_bit(CF_READ_PENDING, &con->flags); 15326ed7257bSPatrick Caulfield do { 15336ed7257bSPatrick Caulfield err = con->rx_action(con); 15346ed7257bSPatrick Caulfield } while (!err); 15356ed7257bSPatrick Caulfield } 15366ed7257bSPatrick Caulfield 15376ed7257bSPatrick Caulfield /* Send workqueue function */ 15386ed7257bSPatrick Caulfield static void process_send_sockets(struct work_struct *work) 15396ed7257bSPatrick Caulfield { 15406ed7257bSPatrick Caulfield struct connection *con = container_of(work, struct connection, swork); 15416ed7257bSPatrick Caulfield 15428a4abb08Stsutomu.owa@toshiba.co.jp clear_bit(CF_WRITE_PENDING, &con->flags); 154361d9102bSBob Peterson if (con->sock == NULL) /* not mutex protected so check it inside too */ 15446ed7257bSPatrick Caulfield con->connect_action(con); 154501da24d3SBob Peterson if (!list_empty(&con->writequeue)) 15466ed7257bSPatrick Caulfield send_to_sock(con); 15476ed7257bSPatrick Caulfield } 15486ed7257bSPatrick Caulfield 15496ed7257bSPatrick Caulfield 15506ed7257bSPatrick Caulfield /* Discard all entries on the write queues */ 15516ed7257bSPatrick Caulfield static void clean_writequeues(void) 15526ed7257bSPatrick Caulfield { 15535e9ccc37SChristine Caulfield foreach_conn(clean_one_writequeue); 15546ed7257bSPatrick Caulfield } 15556ed7257bSPatrick Caulfield 15566ed7257bSPatrick Caulfield static void work_stop(void) 15576ed7257bSPatrick Caulfield { 1558b355516fSDavid Windsor if (recv_workqueue) 15596ed7257bSPatrick Caulfield destroy_workqueue(recv_workqueue); 1560b355516fSDavid Windsor if (send_workqueue) 15616ed7257bSPatrick Caulfield destroy_workqueue(send_workqueue); 15626ed7257bSPatrick Caulfield } 15636ed7257bSPatrick Caulfield 15646ed7257bSPatrick Caulfield static int work_start(void) 15656ed7257bSPatrick Caulfield { 1566e43f055aSDavid Teigland recv_workqueue = alloc_workqueue("dlm_recv", 1567e43f055aSDavid Teigland WQ_UNBOUND | WQ_MEM_RECLAIM, 1); 1568b9d41052SNamhyung Kim if (!recv_workqueue) { 1569b9d41052SNamhyung Kim log_print("can't start dlm_recv"); 1570b9d41052SNamhyung Kim return -ENOMEM; 15716ed7257bSPatrick Caulfield } 15726ed7257bSPatrick Caulfield 1573e43f055aSDavid Teigland send_workqueue = alloc_workqueue("dlm_send", 1574e43f055aSDavid Teigland WQ_UNBOUND | WQ_MEM_RECLAIM, 1); 1575b9d41052SNamhyung Kim if (!send_workqueue) { 1576b9d41052SNamhyung Kim log_print("can't start dlm_send"); 15776ed7257bSPatrick Caulfield destroy_workqueue(recv_workqueue); 1578b9d41052SNamhyung Kim return -ENOMEM; 15796ed7257bSPatrick Caulfield } 15806ed7257bSPatrick Caulfield 15816ed7257bSPatrick Caulfield return 0; 15826ed7257bSPatrick Caulfield } 15836ed7257bSPatrick Caulfield 1584f0fb83cbStsutomu.owa@toshiba.co.jp static void _stop_conn(struct connection *con, bool and_other) 15856ed7257bSPatrick Caulfield { 1586f0fb83cbStsutomu.owa@toshiba.co.jp mutex_lock(&con->sock_mutex); 1587173a31feStsutomu.owa@toshiba.co.jp set_bit(CF_CLOSE, &con->flags); 1588f0fb83cbStsutomu.owa@toshiba.co.jp set_bit(CF_READ_PENDING, &con->flags); 15898a4abb08Stsutomu.owa@toshiba.co.jp set_bit(CF_WRITE_PENDING, &con->flags); 159093eaadebStsutomu.owa@toshiba.co.jp if (con->sock && con->sock->sk) { 159193eaadebStsutomu.owa@toshiba.co.jp write_lock_bh(&con->sock->sk->sk_callback_lock); 1592afb853fbSPatrick Caulfield con->sock->sk->sk_user_data = NULL; 159393eaadebStsutomu.owa@toshiba.co.jp write_unlock_bh(&con->sock->sk->sk_callback_lock); 159493eaadebStsutomu.owa@toshiba.co.jp } 1595f0fb83cbStsutomu.owa@toshiba.co.jp if (con->othercon && and_other) 1596f0fb83cbStsutomu.owa@toshiba.co.jp _stop_conn(con->othercon, false); 1597f0fb83cbStsutomu.owa@toshiba.co.jp mutex_unlock(&con->sock_mutex); 1598f0fb83cbStsutomu.owa@toshiba.co.jp } 1599f0fb83cbStsutomu.owa@toshiba.co.jp 1600f0fb83cbStsutomu.owa@toshiba.co.jp static void stop_conn(struct connection *con) 1601f0fb83cbStsutomu.owa@toshiba.co.jp { 1602f0fb83cbStsutomu.owa@toshiba.co.jp _stop_conn(con, true); 1603afb853fbSPatrick Caulfield } 16045e9ccc37SChristine Caulfield 1605055923bfSAlexander Aring static void shutdown_conn(struct connection *con) 1606055923bfSAlexander Aring { 1607055923bfSAlexander Aring if (con->shutdown_action) 1608055923bfSAlexander Aring con->shutdown_action(con); 1609055923bfSAlexander Aring } 1610055923bfSAlexander Aring 16115e9ccc37SChristine Caulfield static void free_conn(struct connection *con) 16125e9ccc37SChristine Caulfield { 16130d737a8cSMarcelo Ricardo Leitner close_connection(con, true, true, true); 16145e9ccc37SChristine Caulfield if (con->othercon) 16155e9ccc37SChristine Caulfield kmem_cache_free(con_cache, con->othercon); 16165e9ccc37SChristine Caulfield hlist_del(&con->list); 16175e9ccc37SChristine Caulfield kmem_cache_free(con_cache, con); 16186ed7257bSPatrick Caulfield } 16195e9ccc37SChristine Caulfield 1620f0fb83cbStsutomu.owa@toshiba.co.jp static void work_flush(void) 1621f0fb83cbStsutomu.owa@toshiba.co.jp { 1622f0fb83cbStsutomu.owa@toshiba.co.jp int ok; 1623f0fb83cbStsutomu.owa@toshiba.co.jp int i; 1624f0fb83cbStsutomu.owa@toshiba.co.jp struct hlist_node *n; 1625f0fb83cbStsutomu.owa@toshiba.co.jp struct connection *con; 1626f0fb83cbStsutomu.owa@toshiba.co.jp 1627b355516fSDavid Windsor if (recv_workqueue) 1628f0fb83cbStsutomu.owa@toshiba.co.jp flush_workqueue(recv_workqueue); 1629b355516fSDavid Windsor if (send_workqueue) 1630f0fb83cbStsutomu.owa@toshiba.co.jp flush_workqueue(send_workqueue); 1631f0fb83cbStsutomu.owa@toshiba.co.jp do { 1632f0fb83cbStsutomu.owa@toshiba.co.jp ok = 1; 1633f0fb83cbStsutomu.owa@toshiba.co.jp foreach_conn(stop_conn); 1634b355516fSDavid Windsor if (recv_workqueue) 1635f0fb83cbStsutomu.owa@toshiba.co.jp flush_workqueue(recv_workqueue); 1636b355516fSDavid Windsor if (send_workqueue) 1637f0fb83cbStsutomu.owa@toshiba.co.jp flush_workqueue(send_workqueue); 1638f0fb83cbStsutomu.owa@toshiba.co.jp for (i = 0; i < CONN_HASH_SIZE && ok; i++) { 1639f0fb83cbStsutomu.owa@toshiba.co.jp hlist_for_each_entry_safe(con, n, 1640f0fb83cbStsutomu.owa@toshiba.co.jp &connection_hash[i], list) { 1641f0fb83cbStsutomu.owa@toshiba.co.jp ok &= test_bit(CF_READ_PENDING, &con->flags); 16428a4abb08Stsutomu.owa@toshiba.co.jp ok &= test_bit(CF_WRITE_PENDING, &con->flags); 16438a4abb08Stsutomu.owa@toshiba.co.jp if (con->othercon) { 1644f0fb83cbStsutomu.owa@toshiba.co.jp ok &= test_bit(CF_READ_PENDING, 1645f0fb83cbStsutomu.owa@toshiba.co.jp &con->othercon->flags); 16468a4abb08Stsutomu.owa@toshiba.co.jp ok &= test_bit(CF_WRITE_PENDING, 16478a4abb08Stsutomu.owa@toshiba.co.jp &con->othercon->flags); 16488a4abb08Stsutomu.owa@toshiba.co.jp } 1649f0fb83cbStsutomu.owa@toshiba.co.jp } 1650f0fb83cbStsutomu.owa@toshiba.co.jp } 1651f0fb83cbStsutomu.owa@toshiba.co.jp } while (!ok); 1652f0fb83cbStsutomu.owa@toshiba.co.jp } 1653f0fb83cbStsutomu.owa@toshiba.co.jp 16545e9ccc37SChristine Caulfield void dlm_lowcomms_stop(void) 16555e9ccc37SChristine Caulfield { 16565e9ccc37SChristine Caulfield /* Set all the flags to prevent any 16575e9ccc37SChristine Caulfield socket activity. 16585e9ccc37SChristine Caulfield */ 16595e9ccc37SChristine Caulfield mutex_lock(&connections_lock); 1660513ef596SDavid Teigland dlm_allow_conn = 0; 1661f0fb83cbStsutomu.owa@toshiba.co.jp mutex_unlock(&connections_lock); 1662055923bfSAlexander Aring foreach_conn(shutdown_conn); 1663f0fb83cbStsutomu.owa@toshiba.co.jp work_flush(); 16643a8db798SMarcelo Ricardo Leitner clean_writequeues(); 16653a8db798SMarcelo Ricardo Leitner foreach_conn(free_conn); 16666ed7257bSPatrick Caulfield work_stop(); 16676ed7257bSPatrick Caulfield 16686ed7257bSPatrick Caulfield kmem_cache_destroy(con_cache); 16696ed7257bSPatrick Caulfield } 16706ed7257bSPatrick Caulfield 16716ed7257bSPatrick Caulfield int dlm_lowcomms_start(void) 16726ed7257bSPatrick Caulfield { 16736ed7257bSPatrick Caulfield int error = -EINVAL; 16746ed7257bSPatrick Caulfield struct connection *con; 16755e9ccc37SChristine Caulfield int i; 16765e9ccc37SChristine Caulfield 16775e9ccc37SChristine Caulfield for (i = 0; i < CONN_HASH_SIZE; i++) 16785e9ccc37SChristine Caulfield INIT_HLIST_HEAD(&connection_hash[i]); 16796ed7257bSPatrick Caulfield 16806ed7257bSPatrick Caulfield init_local(); 16816ed7257bSPatrick Caulfield if (!dlm_local_count) { 1682617e82e1SDavid Teigland error = -ENOTCONN; 16836ed7257bSPatrick Caulfield log_print("no local IP address has been set"); 1684513ef596SDavid Teigland goto fail; 16856ed7257bSPatrick Caulfield } 16866ed7257bSPatrick Caulfield 16876ed7257bSPatrick Caulfield error = -ENOMEM; 16886ed7257bSPatrick Caulfield con_cache = kmem_cache_create("dlm_conn", sizeof(struct connection), 16896ed7257bSPatrick Caulfield __alignof__(struct connection), 0, 169020c2df83SPaul Mundt NULL); 16916ed7257bSPatrick Caulfield if (!con_cache) 1692513ef596SDavid Teigland goto fail; 1693513ef596SDavid Teigland 1694513ef596SDavid Teigland error = work_start(); 1695513ef596SDavid Teigland if (error) 1696513ef596SDavid Teigland goto fail_destroy; 1697513ef596SDavid Teigland 1698513ef596SDavid Teigland dlm_allow_conn = 1; 16996ed7257bSPatrick Caulfield 17006ed7257bSPatrick Caulfield /* Start listening */ 17016ed7257bSPatrick Caulfield if (dlm_config.ci_protocol == 0) 17026ed7257bSPatrick Caulfield error = tcp_listen_for_all(); 17036ed7257bSPatrick Caulfield else 17046ed7257bSPatrick Caulfield error = sctp_listen_for_all(); 17056ed7257bSPatrick Caulfield if (error) 17066ed7257bSPatrick Caulfield goto fail_unlisten; 17076ed7257bSPatrick Caulfield 17086ed7257bSPatrick Caulfield return 0; 17096ed7257bSPatrick Caulfield 17106ed7257bSPatrick Caulfield fail_unlisten: 1711513ef596SDavid Teigland dlm_allow_conn = 0; 17126ed7257bSPatrick Caulfield con = nodeid2con(0,0); 17136ed7257bSPatrick Caulfield if (con) { 17140d737a8cSMarcelo Ricardo Leitner close_connection(con, false, true, true); 17156ed7257bSPatrick Caulfield kmem_cache_free(con_cache, con); 17166ed7257bSPatrick Caulfield } 1717513ef596SDavid Teigland fail_destroy: 17186ed7257bSPatrick Caulfield kmem_cache_destroy(con_cache); 1719513ef596SDavid Teigland fail: 17206ed7257bSPatrick Caulfield return error; 17216ed7257bSPatrick Caulfield } 172236b71a8bSDavid Teigland 172336b71a8bSDavid Teigland void dlm_lowcomms_exit(void) 172436b71a8bSDavid Teigland { 172536b71a8bSDavid Teigland struct dlm_node_addr *na, *safe; 172636b71a8bSDavid Teigland 172736b71a8bSDavid Teigland spin_lock(&dlm_node_addrs_spin); 172836b71a8bSDavid Teigland list_for_each_entry_safe(na, safe, &dlm_node_addrs, list) { 172936b71a8bSDavid Teigland list_del(&na->list); 173036b71a8bSDavid Teigland while (na->addr_count--) 173136b71a8bSDavid Teigland kfree(na->addr[na->addr_count]); 173236b71a8bSDavid Teigland kfree(na); 173336b71a8bSDavid Teigland } 173436b71a8bSDavid Teigland spin_unlock(&dlm_node_addrs_spin); 173536b71a8bSDavid Teigland } 1736