12522fe45SThomas Gleixner // SPDX-License-Identifier: GPL-2.0-only 26ed7257bSPatrick Caulfield /****************************************************************************** 36ed7257bSPatrick Caulfield ******************************************************************************* 46ed7257bSPatrick Caulfield ** 56ed7257bSPatrick Caulfield ** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. 65e9ccc37SChristine Caulfield ** Copyright (C) 2004-2009 Red Hat, Inc. All rights reserved. 76ed7257bSPatrick Caulfield ** 86ed7257bSPatrick Caulfield ** 96ed7257bSPatrick Caulfield ******************************************************************************* 106ed7257bSPatrick Caulfield ******************************************************************************/ 116ed7257bSPatrick Caulfield 126ed7257bSPatrick Caulfield /* 136ed7257bSPatrick Caulfield * lowcomms.c 146ed7257bSPatrick Caulfield * 156ed7257bSPatrick Caulfield * This is the "low-level" comms layer. 166ed7257bSPatrick Caulfield * 176ed7257bSPatrick Caulfield * It is responsible for sending/receiving messages 186ed7257bSPatrick Caulfield * from other nodes in the cluster. 196ed7257bSPatrick Caulfield * 206ed7257bSPatrick Caulfield * Cluster nodes are referred to by their nodeids. nodeids are 216ed7257bSPatrick Caulfield * simply 32 bit numbers to the locking module - if they need to 222cf12c0bSJoe Perches * be expanded for the cluster infrastructure then that is its 236ed7257bSPatrick Caulfield * responsibility. It is this layer's 246ed7257bSPatrick Caulfield * responsibility to resolve these into IP address or 256ed7257bSPatrick Caulfield * whatever it needs for inter-node communication. 266ed7257bSPatrick Caulfield * 276ed7257bSPatrick Caulfield * The comms level is two kernel threads that deal mainly with 286ed7257bSPatrick Caulfield * the receiving of messages from other nodes and passing them 296ed7257bSPatrick Caulfield * up to the mid-level comms layer (which understands the 306ed7257bSPatrick Caulfield * message format) for execution by the locking core, and 316ed7257bSPatrick Caulfield * a send thread which does all the setting up of connections 326ed7257bSPatrick Caulfield * to remote nodes and the sending of data. Threads are not allowed 336ed7257bSPatrick Caulfield * to send their own data because it may cause them to wait in times 346ed7257bSPatrick Caulfield * of high load. Also, this way, the sending thread can collect together 356ed7257bSPatrick Caulfield * messages bound for one node and send them in one block. 366ed7257bSPatrick Caulfield * 372cf12c0bSJoe Perches * lowcomms will choose to use either TCP or SCTP as its transport layer 386ed7257bSPatrick Caulfield * depending on the configuration variable 'protocol'. This should be set 396ed7257bSPatrick Caulfield * to 0 (default) for TCP or 1 for SCTP. It should be configured using a 406ed7257bSPatrick Caulfield * cluster-wide mechanism as it must be the same on all nodes of the cluster 416ed7257bSPatrick Caulfield * for the DLM to function. 426ed7257bSPatrick Caulfield * 436ed7257bSPatrick Caulfield */ 446ed7257bSPatrick Caulfield 456ed7257bSPatrick Caulfield #include <asm/ioctls.h> 466ed7257bSPatrick Caulfield #include <net/sock.h> 476ed7257bSPatrick Caulfield #include <net/tcp.h> 486ed7257bSPatrick Caulfield #include <linux/pagemap.h> 496ed7257bSPatrick Caulfield #include <linux/file.h> 507a936ce7SMatthias Kaehlcke #include <linux/mutex.h> 516ed7257bSPatrick Caulfield #include <linux/sctp.h> 525a0e3ad6STejun Heo #include <linux/slab.h> 532f2d76ccSBenjamin Poirier #include <net/sctp/sctp.h> 5444ad532bSJoe Perches #include <net/ipv6.h> 556ed7257bSPatrick Caulfield 566ed7257bSPatrick Caulfield #include "dlm_internal.h" 576ed7257bSPatrick Caulfield #include "lowcomms.h" 586ed7257bSPatrick Caulfield #include "midcomms.h" 596ed7257bSPatrick Caulfield #include "config.h" 606ed7257bSPatrick Caulfield 616ed7257bSPatrick Caulfield #define NEEDED_RMEM (4*1024*1024) 626ed7257bSPatrick Caulfield 63f92c8dd7SBob Peterson /* Number of messages to send before rescheduling */ 64f92c8dd7SBob Peterson #define MAX_SEND_MSG_COUNT 25 65055923bfSAlexander Aring #define DLM_SHUTDOWN_WAIT_TIMEOUT msecs_to_jiffies(10000) 66f92c8dd7SBob Peterson 676ed7257bSPatrick Caulfield struct connection { 686ed7257bSPatrick Caulfield struct socket *sock; /* NULL if not connected */ 696ed7257bSPatrick Caulfield uint32_t nodeid; /* So we know who we are in the list */ 706ed7257bSPatrick Caulfield struct mutex sock_mutex; 716ed7257bSPatrick Caulfield unsigned long flags; 726ed7257bSPatrick Caulfield #define CF_READ_PENDING 1 738a4abb08Stsutomu.owa@toshiba.co.jp #define CF_WRITE_PENDING 2 746ed7257bSPatrick Caulfield #define CF_INIT_PENDING 4 756ed7257bSPatrick Caulfield #define CF_IS_OTHERCON 5 76063c4c99SLars Marowsky-Bree #define CF_CLOSE 6 77b36930ddSDavid Miller #define CF_APP_LIMITED 7 78b2a66629Stsutomu.owa@toshiba.co.jp #define CF_CLOSING 8 79055923bfSAlexander Aring #define CF_SHUTDOWN 9 8019633c7eSAlexander Aring #define CF_CONNECTED 10 81ba868d9dSAlexander Aring #define CF_RECONNECT 11 82ba868d9dSAlexander Aring #define CF_DELAY_CONNECT 12 838aa31cbfSAlexander Aring #define CF_EOF 13 846ed7257bSPatrick Caulfield struct list_head writequeue; /* List of outgoing writequeue_entries */ 856ed7257bSPatrick Caulfield spinlock_t writequeue_lock; 868aa31cbfSAlexander Aring atomic_t writequeue_cnt; 876ed7257bSPatrick Caulfield int retries; 886ed7257bSPatrick Caulfield #define MAX_CONNECT_RETRIES 3 895e9ccc37SChristine Caulfield struct hlist_node list; 906ed7257bSPatrick Caulfield struct connection *othercon; 91ba868d9dSAlexander Aring struct connection *sendcon; 926ed7257bSPatrick Caulfield struct work_struct rwork; /* Receive workqueue */ 936ed7257bSPatrick Caulfield struct work_struct swork; /* Send workqueue */ 94055923bfSAlexander Aring wait_queue_head_t shutdown_wait; /* wait for graceful shutdown */ 954798cbbfSAlexander Aring unsigned char *rx_buf; 964798cbbfSAlexander Aring int rx_buflen; 974798cbbfSAlexander Aring int rx_leftover; 98a47666ebSAlexander Aring struct rcu_head rcu; 996ed7257bSPatrick Caulfield }; 1006ed7257bSPatrick Caulfield #define sock2con(x) ((struct connection *)(x)->sk_user_data) 1016ed7257bSPatrick Caulfield 102d11ccd45SAlexander Aring struct listen_connection { 103d11ccd45SAlexander Aring struct socket *sock; 104d11ccd45SAlexander Aring struct work_struct rwork; 105d11ccd45SAlexander Aring }; 106d11ccd45SAlexander Aring 107f0747ebfSAlexander Aring #define DLM_WQ_REMAIN_BYTES(e) (PAGE_SIZE - e->end) 108f0747ebfSAlexander Aring #define DLM_WQ_LENGTH_BYTES(e) (e->end - e->offset) 109f0747ebfSAlexander Aring 1106ed7257bSPatrick Caulfield /* An entry waiting to be sent */ 1116ed7257bSPatrick Caulfield struct writequeue_entry { 1126ed7257bSPatrick Caulfield struct list_head list; 1136ed7257bSPatrick Caulfield struct page *page; 1146ed7257bSPatrick Caulfield int offset; 1156ed7257bSPatrick Caulfield int len; 1166ed7257bSPatrick Caulfield int end; 1176ed7257bSPatrick Caulfield int users; 118706474fbSAlexander Aring bool dirty; 1196ed7257bSPatrick Caulfield struct connection *con; 1208f2dc78dSAlexander Aring struct list_head msgs; 1218f2dc78dSAlexander Aring struct kref ref; 1228f2dc78dSAlexander Aring }; 1238f2dc78dSAlexander Aring 1248f2dc78dSAlexander Aring struct dlm_msg { 1258f2dc78dSAlexander Aring struct writequeue_entry *entry; 1262874d1a6SAlexander Aring struct dlm_msg *orig_msg; 1272874d1a6SAlexander Aring bool retransmit; 1288f2dc78dSAlexander Aring void *ppc; 1298f2dc78dSAlexander Aring int len; 1308f2dc78dSAlexander Aring int idx; /* new()/commit() idx exchange */ 1318f2dc78dSAlexander Aring 1328f2dc78dSAlexander Aring struct list_head list; 1338f2dc78dSAlexander Aring struct kref ref; 1346ed7257bSPatrick Caulfield }; 1356ed7257bSPatrick Caulfield 13636b71a8bSDavid Teigland struct dlm_node_addr { 13736b71a8bSDavid Teigland struct list_head list; 13836b71a8bSDavid Teigland int nodeid; 139e125fbebSAlexander Aring int mark; 14036b71a8bSDavid Teigland int addr_count; 14198e1b60eSMike Christie int curr_addr_index; 14236b71a8bSDavid Teigland struct sockaddr_storage *addr[DLM_MAX_ADDR_COUNT]; 14336b71a8bSDavid Teigland }; 14436b71a8bSDavid Teigland 145*a66c008cSAlexander Aring struct dlm_proto_ops { 146*a66c008cSAlexander Aring /* What to do to connect */ 147*a66c008cSAlexander Aring void (*connect_action)(struct connection *con); 148*a66c008cSAlexander Aring /* What to do to shutdown */ 149*a66c008cSAlexander Aring void (*shutdown_action)(struct connection *con); 150*a66c008cSAlexander Aring /* What to do to eof check */ 151*a66c008cSAlexander Aring bool (*eof_condition)(struct connection *con); 152*a66c008cSAlexander Aring }; 153*a66c008cSAlexander Aring 154cc661fc9SBob Peterson static struct listen_sock_callbacks { 155cc661fc9SBob Peterson void (*sk_error_report)(struct sock *); 156cc661fc9SBob Peterson void (*sk_data_ready)(struct sock *); 157cc661fc9SBob Peterson void (*sk_state_change)(struct sock *); 158cc661fc9SBob Peterson void (*sk_write_space)(struct sock *); 159cc661fc9SBob Peterson } listen_sock; 160cc661fc9SBob Peterson 16136b71a8bSDavid Teigland static LIST_HEAD(dlm_node_addrs); 16236b71a8bSDavid Teigland static DEFINE_SPINLOCK(dlm_node_addrs_spin); 16336b71a8bSDavid Teigland 164d11ccd45SAlexander Aring static struct listen_connection listen_con; 1656ed7257bSPatrick Caulfield static struct sockaddr_storage *dlm_local_addr[DLM_MAX_ADDR_COUNT]; 1666ed7257bSPatrick Caulfield static int dlm_local_count; 16751746163SAlexander Aring int dlm_allow_conn; 1686ed7257bSPatrick Caulfield 1696ed7257bSPatrick Caulfield /* Work queues */ 1706ed7257bSPatrick Caulfield static struct workqueue_struct *recv_workqueue; 1716ed7257bSPatrick Caulfield static struct workqueue_struct *send_workqueue; 1726ed7257bSPatrick Caulfield 1735e9ccc37SChristine Caulfield static struct hlist_head connection_hash[CONN_HASH_SIZE]; 174a47666ebSAlexander Aring static DEFINE_SPINLOCK(connections_lock); 175a47666ebSAlexander Aring DEFINE_STATIC_SRCU(connections_srcu); 1766ed7257bSPatrick Caulfield 177*a66c008cSAlexander Aring static const struct dlm_proto_ops *dlm_proto_ops; 178*a66c008cSAlexander Aring 1796ed7257bSPatrick Caulfield static void process_recv_sockets(struct work_struct *work); 1806ed7257bSPatrick Caulfield static void process_send_sockets(struct work_struct *work); 1816ed7257bSPatrick Caulfield 1820672c3c2SAlexander Aring static void sctp_connect_to_sock(struct connection *con); 1830672c3c2SAlexander Aring static void tcp_connect_to_sock(struct connection *con); 1845e9ccc37SChristine Caulfield 18566d5955aSAlexander Aring /* need to held writequeue_lock */ 18666d5955aSAlexander Aring static struct writequeue_entry *con_next_wq(struct connection *con) 18766d5955aSAlexander Aring { 18866d5955aSAlexander Aring struct writequeue_entry *e; 18966d5955aSAlexander Aring 19066d5955aSAlexander Aring if (list_empty(&con->writequeue)) 19166d5955aSAlexander Aring return NULL; 19266d5955aSAlexander Aring 19366d5955aSAlexander Aring e = list_first_entry(&con->writequeue, struct writequeue_entry, 19466d5955aSAlexander Aring list); 19566d5955aSAlexander Aring if (e->len == 0) 19666d5955aSAlexander Aring return NULL; 19766d5955aSAlexander Aring 19866d5955aSAlexander Aring return e; 19966d5955aSAlexander Aring } 20066d5955aSAlexander Aring 201b38bc9c2SAlexander Aring static struct connection *__find_con(int nodeid, int r) 2025e9ccc37SChristine Caulfield { 2035e9ccc37SChristine Caulfield struct connection *con; 2045e9ccc37SChristine Caulfield 205a47666ebSAlexander Aring hlist_for_each_entry_rcu(con, &connection_hash[r], list) { 206b38bc9c2SAlexander Aring if (con->nodeid == nodeid) 2075e9ccc37SChristine Caulfield return con; 2085e9ccc37SChristine Caulfield } 209a47666ebSAlexander Aring 2105e9ccc37SChristine Caulfield return NULL; 2115e9ccc37SChristine Caulfield } 2125e9ccc37SChristine Caulfield 2138aa31cbfSAlexander Aring static bool tcp_eof_condition(struct connection *con) 2148aa31cbfSAlexander Aring { 2158aa31cbfSAlexander Aring return atomic_read(&con->writequeue_cnt); 2168aa31cbfSAlexander Aring } 2178aa31cbfSAlexander Aring 2186cde210aSAlexander Aring static int dlm_con_init(struct connection *con, int nodeid) 2196ed7257bSPatrick Caulfield { 2204798cbbfSAlexander Aring con->rx_buflen = dlm_config.ci_buffer_size; 2214798cbbfSAlexander Aring con->rx_buf = kmalloc(con->rx_buflen, GFP_NOFS); 2226cde210aSAlexander Aring if (!con->rx_buf) 2236cde210aSAlexander Aring return -ENOMEM; 2244798cbbfSAlexander Aring 2256ed7257bSPatrick Caulfield con->nodeid = nodeid; 2266ed7257bSPatrick Caulfield mutex_init(&con->sock_mutex); 2276ed7257bSPatrick Caulfield INIT_LIST_HEAD(&con->writequeue); 2286ed7257bSPatrick Caulfield spin_lock_init(&con->writequeue_lock); 2298aa31cbfSAlexander Aring atomic_set(&con->writequeue_cnt, 0); 2306ed7257bSPatrick Caulfield INIT_WORK(&con->swork, process_send_sockets); 2316ed7257bSPatrick Caulfield INIT_WORK(&con->rwork, process_recv_sockets); 232055923bfSAlexander Aring init_waitqueue_head(&con->shutdown_wait); 2336ed7257bSPatrick Caulfield 2346cde210aSAlexander Aring return 0; 2356cde210aSAlexander Aring } 2366cde210aSAlexander Aring 2376cde210aSAlexander Aring /* 2386cde210aSAlexander Aring * If 'allocation' is zero then we don't attempt to create a new 2396cde210aSAlexander Aring * connection structure for this node. 2406cde210aSAlexander Aring */ 2416cde210aSAlexander Aring static struct connection *nodeid2con(int nodeid, gfp_t alloc) 2426cde210aSAlexander Aring { 2436cde210aSAlexander Aring struct connection *con, *tmp; 2446cde210aSAlexander Aring int r, ret; 2456cde210aSAlexander Aring 246b38bc9c2SAlexander Aring r = nodeid_hash(nodeid); 247b38bc9c2SAlexander Aring con = __find_con(nodeid, r); 2486cde210aSAlexander Aring if (con || !alloc) 2496cde210aSAlexander Aring return con; 2506cde210aSAlexander Aring 2516cde210aSAlexander Aring con = kzalloc(sizeof(*con), alloc); 2526cde210aSAlexander Aring if (!con) 2536cde210aSAlexander Aring return NULL; 2546cde210aSAlexander Aring 2556cde210aSAlexander Aring ret = dlm_con_init(con, nodeid); 2566cde210aSAlexander Aring if (ret) { 2576cde210aSAlexander Aring kfree(con); 2586cde210aSAlexander Aring return NULL; 2596cde210aSAlexander Aring } 2606cde210aSAlexander Aring 261a47666ebSAlexander Aring spin_lock(&connections_lock); 2624f2b30fdSAlexander Aring /* Because multiple workqueues/threads calls this function it can 2634f2b30fdSAlexander Aring * race on multiple cpu's. Instead of locking hot path __find_con() 2644f2b30fdSAlexander Aring * we just check in rare cases of recently added nodes again 2654f2b30fdSAlexander Aring * under protection of connections_lock. If this is the case we 2664f2b30fdSAlexander Aring * abort our connection creation and return the existing connection. 2674f2b30fdSAlexander Aring */ 268b38bc9c2SAlexander Aring tmp = __find_con(nodeid, r); 2694f2b30fdSAlexander Aring if (tmp) { 2704f2b30fdSAlexander Aring spin_unlock(&connections_lock); 2714f2b30fdSAlexander Aring kfree(con->rx_buf); 2724f2b30fdSAlexander Aring kfree(con); 2734f2b30fdSAlexander Aring return tmp; 2744f2b30fdSAlexander Aring } 2754f2b30fdSAlexander Aring 276a47666ebSAlexander Aring hlist_add_head_rcu(&con->list, &connection_hash[r]); 277a47666ebSAlexander Aring spin_unlock(&connections_lock); 278a47666ebSAlexander Aring 2796ed7257bSPatrick Caulfield return con; 2806ed7257bSPatrick Caulfield } 2816ed7257bSPatrick Caulfield 2825e9ccc37SChristine Caulfield /* Loop round all connections */ 2835e9ccc37SChristine Caulfield static void foreach_conn(void (*conn_func)(struct connection *c)) 2845e9ccc37SChristine Caulfield { 285b38bc9c2SAlexander Aring int i; 2865e9ccc37SChristine Caulfield struct connection *con; 2875e9ccc37SChristine Caulfield 2885e9ccc37SChristine Caulfield for (i = 0; i < CONN_HASH_SIZE; i++) { 289a47666ebSAlexander Aring hlist_for_each_entry_rcu(con, &connection_hash[i], list) 2905e9ccc37SChristine Caulfield conn_func(con); 2915e9ccc37SChristine Caulfield } 2926ed7257bSPatrick Caulfield } 2936ed7257bSPatrick Caulfield 29436b71a8bSDavid Teigland static struct dlm_node_addr *find_node_addr(int nodeid) 2956ed7257bSPatrick Caulfield { 29636b71a8bSDavid Teigland struct dlm_node_addr *na; 29736b71a8bSDavid Teigland 29836b71a8bSDavid Teigland list_for_each_entry(na, &dlm_node_addrs, list) { 29936b71a8bSDavid Teigland if (na->nodeid == nodeid) 30036b71a8bSDavid Teigland return na; 30136b71a8bSDavid Teigland } 30236b71a8bSDavid Teigland return NULL; 30336b71a8bSDavid Teigland } 30436b71a8bSDavid Teigland 30540c6b83eSAlexander Aring static int addr_compare(const struct sockaddr_storage *x, 30640c6b83eSAlexander Aring const struct sockaddr_storage *y) 30736b71a8bSDavid Teigland { 30836b71a8bSDavid Teigland switch (x->ss_family) { 30936b71a8bSDavid Teigland case AF_INET: { 31036b71a8bSDavid Teigland struct sockaddr_in *sinx = (struct sockaddr_in *)x; 31136b71a8bSDavid Teigland struct sockaddr_in *siny = (struct sockaddr_in *)y; 31236b71a8bSDavid Teigland if (sinx->sin_addr.s_addr != siny->sin_addr.s_addr) 31336b71a8bSDavid Teigland return 0; 31436b71a8bSDavid Teigland if (sinx->sin_port != siny->sin_port) 31536b71a8bSDavid Teigland return 0; 31636b71a8bSDavid Teigland break; 31736b71a8bSDavid Teigland } 31836b71a8bSDavid Teigland case AF_INET6: { 31936b71a8bSDavid Teigland struct sockaddr_in6 *sinx = (struct sockaddr_in6 *)x; 32036b71a8bSDavid Teigland struct sockaddr_in6 *siny = (struct sockaddr_in6 *)y; 32136b71a8bSDavid Teigland if (!ipv6_addr_equal(&sinx->sin6_addr, &siny->sin6_addr)) 32236b71a8bSDavid Teigland return 0; 32336b71a8bSDavid Teigland if (sinx->sin6_port != siny->sin6_port) 32436b71a8bSDavid Teigland return 0; 32536b71a8bSDavid Teigland break; 32636b71a8bSDavid Teigland } 32736b71a8bSDavid Teigland default: 32836b71a8bSDavid Teigland return 0; 32936b71a8bSDavid Teigland } 33036b71a8bSDavid Teigland return 1; 33136b71a8bSDavid Teigland } 33236b71a8bSDavid Teigland 33336b71a8bSDavid Teigland static int nodeid_to_addr(int nodeid, struct sockaddr_storage *sas_out, 334e125fbebSAlexander Aring struct sockaddr *sa_out, bool try_new_addr, 335e125fbebSAlexander Aring unsigned int *mark) 33636b71a8bSDavid Teigland { 33736b71a8bSDavid Teigland struct sockaddr_storage sas; 33836b71a8bSDavid Teigland struct dlm_node_addr *na; 3396ed7257bSPatrick Caulfield 3406ed7257bSPatrick Caulfield if (!dlm_local_count) 3416ed7257bSPatrick Caulfield return -1; 3426ed7257bSPatrick Caulfield 34336b71a8bSDavid Teigland spin_lock(&dlm_node_addrs_spin); 34436b71a8bSDavid Teigland na = find_node_addr(nodeid); 34598e1b60eSMike Christie if (na && na->addr_count) { 346ee44b4bcSMarcelo Ricardo Leitner memcpy(&sas, na->addr[na->curr_addr_index], 347ee44b4bcSMarcelo Ricardo Leitner sizeof(struct sockaddr_storage)); 348ee44b4bcSMarcelo Ricardo Leitner 34998e1b60eSMike Christie if (try_new_addr) { 35098e1b60eSMike Christie na->curr_addr_index++; 35198e1b60eSMike Christie if (na->curr_addr_index == na->addr_count) 35298e1b60eSMike Christie na->curr_addr_index = 0; 35398e1b60eSMike Christie } 35498e1b60eSMike Christie } 35536b71a8bSDavid Teigland spin_unlock(&dlm_node_addrs_spin); 35636b71a8bSDavid Teigland 35736b71a8bSDavid Teigland if (!na) 35836b71a8bSDavid Teigland return -EEXIST; 35936b71a8bSDavid Teigland 36036b71a8bSDavid Teigland if (!na->addr_count) 36136b71a8bSDavid Teigland return -ENOENT; 36236b71a8bSDavid Teigland 363e125fbebSAlexander Aring *mark = na->mark; 364e125fbebSAlexander Aring 36536b71a8bSDavid Teigland if (sas_out) 36636b71a8bSDavid Teigland memcpy(sas_out, &sas, sizeof(struct sockaddr_storage)); 36736b71a8bSDavid Teigland 36836b71a8bSDavid Teigland if (!sa_out) 36936b71a8bSDavid Teigland return 0; 3706ed7257bSPatrick Caulfield 3716ed7257bSPatrick Caulfield if (dlm_local_addr[0]->ss_family == AF_INET) { 37236b71a8bSDavid Teigland struct sockaddr_in *in4 = (struct sockaddr_in *) &sas; 37336b71a8bSDavid Teigland struct sockaddr_in *ret4 = (struct sockaddr_in *) sa_out; 3746ed7257bSPatrick Caulfield ret4->sin_addr.s_addr = in4->sin_addr.s_addr; 3756ed7257bSPatrick Caulfield } else { 37636b71a8bSDavid Teigland struct sockaddr_in6 *in6 = (struct sockaddr_in6 *) &sas; 37736b71a8bSDavid Teigland struct sockaddr_in6 *ret6 = (struct sockaddr_in6 *) sa_out; 3784e3fd7a0SAlexey Dobriyan ret6->sin6_addr = in6->sin6_addr; 3796ed7257bSPatrick Caulfield } 3806ed7257bSPatrick Caulfield 3816ed7257bSPatrick Caulfield return 0; 3826ed7257bSPatrick Caulfield } 3836ed7257bSPatrick Caulfield 384e125fbebSAlexander Aring static int addr_to_nodeid(struct sockaddr_storage *addr, int *nodeid, 385e125fbebSAlexander Aring unsigned int *mark) 38636b71a8bSDavid Teigland { 38736b71a8bSDavid Teigland struct dlm_node_addr *na; 38836b71a8bSDavid Teigland int rv = -EEXIST; 38998e1b60eSMike Christie int addr_i; 39036b71a8bSDavid Teigland 39136b71a8bSDavid Teigland spin_lock(&dlm_node_addrs_spin); 39236b71a8bSDavid Teigland list_for_each_entry(na, &dlm_node_addrs, list) { 39336b71a8bSDavid Teigland if (!na->addr_count) 39436b71a8bSDavid Teigland continue; 39536b71a8bSDavid Teigland 39698e1b60eSMike Christie for (addr_i = 0; addr_i < na->addr_count; addr_i++) { 39798e1b60eSMike Christie if (addr_compare(na->addr[addr_i], addr)) { 39836b71a8bSDavid Teigland *nodeid = na->nodeid; 399e125fbebSAlexander Aring *mark = na->mark; 40036b71a8bSDavid Teigland rv = 0; 40198e1b60eSMike Christie goto unlock; 40236b71a8bSDavid Teigland } 40398e1b60eSMike Christie } 40498e1b60eSMike Christie } 40598e1b60eSMike Christie unlock: 40636b71a8bSDavid Teigland spin_unlock(&dlm_node_addrs_spin); 40736b71a8bSDavid Teigland return rv; 40836b71a8bSDavid Teigland } 40936b71a8bSDavid Teigland 4104f19d071SAlexander Aring /* caller need to held dlm_node_addrs_spin lock */ 4114f19d071SAlexander Aring static bool dlm_lowcomms_na_has_addr(const struct dlm_node_addr *na, 4124f19d071SAlexander Aring const struct sockaddr_storage *addr) 4134f19d071SAlexander Aring { 4144f19d071SAlexander Aring int i; 4154f19d071SAlexander Aring 4164f19d071SAlexander Aring for (i = 0; i < na->addr_count; i++) { 4174f19d071SAlexander Aring if (addr_compare(na->addr[i], addr)) 4184f19d071SAlexander Aring return true; 4194f19d071SAlexander Aring } 4204f19d071SAlexander Aring 4214f19d071SAlexander Aring return false; 4224f19d071SAlexander Aring } 4234f19d071SAlexander Aring 42436b71a8bSDavid Teigland int dlm_lowcomms_addr(int nodeid, struct sockaddr_storage *addr, int len) 42536b71a8bSDavid Teigland { 42636b71a8bSDavid Teigland struct sockaddr_storage *new_addr; 42736b71a8bSDavid Teigland struct dlm_node_addr *new_node, *na; 4284f19d071SAlexander Aring bool ret; 42936b71a8bSDavid Teigland 43036b71a8bSDavid Teigland new_node = kzalloc(sizeof(struct dlm_node_addr), GFP_NOFS); 43136b71a8bSDavid Teigland if (!new_node) 43236b71a8bSDavid Teigland return -ENOMEM; 43336b71a8bSDavid Teigland 43436b71a8bSDavid Teigland new_addr = kzalloc(sizeof(struct sockaddr_storage), GFP_NOFS); 43536b71a8bSDavid Teigland if (!new_addr) { 43636b71a8bSDavid Teigland kfree(new_node); 43736b71a8bSDavid Teigland return -ENOMEM; 43836b71a8bSDavid Teigland } 43936b71a8bSDavid Teigland 44036b71a8bSDavid Teigland memcpy(new_addr, addr, len); 44136b71a8bSDavid Teigland 44236b71a8bSDavid Teigland spin_lock(&dlm_node_addrs_spin); 44336b71a8bSDavid Teigland na = find_node_addr(nodeid); 44436b71a8bSDavid Teigland if (!na) { 44536b71a8bSDavid Teigland new_node->nodeid = nodeid; 44636b71a8bSDavid Teigland new_node->addr[0] = new_addr; 44736b71a8bSDavid Teigland new_node->addr_count = 1; 448e125fbebSAlexander Aring new_node->mark = dlm_config.ci_mark; 44936b71a8bSDavid Teigland list_add(&new_node->list, &dlm_node_addrs); 45036b71a8bSDavid Teigland spin_unlock(&dlm_node_addrs_spin); 45136b71a8bSDavid Teigland return 0; 45236b71a8bSDavid Teigland } 45336b71a8bSDavid Teigland 4544f19d071SAlexander Aring ret = dlm_lowcomms_na_has_addr(na, addr); 4554f19d071SAlexander Aring if (ret) { 4564f19d071SAlexander Aring spin_unlock(&dlm_node_addrs_spin); 4574f19d071SAlexander Aring kfree(new_addr); 4584f19d071SAlexander Aring kfree(new_node); 4594f19d071SAlexander Aring return -EEXIST; 4604f19d071SAlexander Aring } 4614f19d071SAlexander Aring 46236b71a8bSDavid Teigland if (na->addr_count >= DLM_MAX_ADDR_COUNT) { 46336b71a8bSDavid Teigland spin_unlock(&dlm_node_addrs_spin); 46436b71a8bSDavid Teigland kfree(new_addr); 46536b71a8bSDavid Teigland kfree(new_node); 46636b71a8bSDavid Teigland return -ENOSPC; 46736b71a8bSDavid Teigland } 46836b71a8bSDavid Teigland 46936b71a8bSDavid Teigland na->addr[na->addr_count++] = new_addr; 47036b71a8bSDavid Teigland spin_unlock(&dlm_node_addrs_spin); 47136b71a8bSDavid Teigland kfree(new_node); 47236b71a8bSDavid Teigland return 0; 47336b71a8bSDavid Teigland } 47436b71a8bSDavid Teigland 4756ed7257bSPatrick Caulfield /* Data available on socket or listen socket received a connect */ 476676d2369SDavid S. Miller static void lowcomms_data_ready(struct sock *sk) 4776ed7257bSPatrick Caulfield { 47893eaadebStsutomu.owa@toshiba.co.jp struct connection *con; 47993eaadebStsutomu.owa@toshiba.co.jp 48093eaadebStsutomu.owa@toshiba.co.jp read_lock_bh(&sk->sk_callback_lock); 48193eaadebStsutomu.owa@toshiba.co.jp con = sock2con(sk); 482afb853fbSPatrick Caulfield if (con && !test_and_set_bit(CF_READ_PENDING, &con->flags)) 4836ed7257bSPatrick Caulfield queue_work(recv_workqueue, &con->rwork); 48493eaadebStsutomu.owa@toshiba.co.jp read_unlock_bh(&sk->sk_callback_lock); 4856ed7257bSPatrick Caulfield } 4866ed7257bSPatrick Caulfield 487d11ccd45SAlexander Aring static void lowcomms_listen_data_ready(struct sock *sk) 488d11ccd45SAlexander Aring { 4899a4139a7SAlexander Aring if (!dlm_allow_conn) 4909a4139a7SAlexander Aring return; 4919a4139a7SAlexander Aring 492d11ccd45SAlexander Aring queue_work(recv_workqueue, &listen_con.rwork); 493d11ccd45SAlexander Aring } 494d11ccd45SAlexander Aring 4956ed7257bSPatrick Caulfield static void lowcomms_write_space(struct sock *sk) 4966ed7257bSPatrick Caulfield { 49793eaadebStsutomu.owa@toshiba.co.jp struct connection *con; 4986ed7257bSPatrick Caulfield 49993eaadebStsutomu.owa@toshiba.co.jp read_lock_bh(&sk->sk_callback_lock); 50093eaadebStsutomu.owa@toshiba.co.jp con = sock2con(sk); 501b36930ddSDavid Miller if (!con) 50293eaadebStsutomu.owa@toshiba.co.jp goto out; 503b36930ddSDavid Miller 50419633c7eSAlexander Aring if (!test_and_set_bit(CF_CONNECTED, &con->flags)) { 50519633c7eSAlexander Aring log_print("successful connected to node %d", con->nodeid); 50619633c7eSAlexander Aring queue_work(send_workqueue, &con->swork); 50719633c7eSAlexander Aring goto out; 50819633c7eSAlexander Aring } 50919633c7eSAlexander Aring 510b36930ddSDavid Miller clear_bit(SOCK_NOSPACE, &con->sock->flags); 511b36930ddSDavid Miller 512b36930ddSDavid Miller if (test_and_clear_bit(CF_APP_LIMITED, &con->flags)) { 513b36930ddSDavid Miller con->sock->sk->sk_write_pending--; 5149cd3e072SEric Dumazet clear_bit(SOCKWQ_ASYNC_NOSPACE, &con->sock->flags); 515b36930ddSDavid Miller } 516b36930ddSDavid Miller 5176ed7257bSPatrick Caulfield queue_work(send_workqueue, &con->swork); 51893eaadebStsutomu.owa@toshiba.co.jp out: 51993eaadebStsutomu.owa@toshiba.co.jp read_unlock_bh(&sk->sk_callback_lock); 5206ed7257bSPatrick Caulfield } 5216ed7257bSPatrick Caulfield 5226ed7257bSPatrick Caulfield static inline void lowcomms_connect_sock(struct connection *con) 5236ed7257bSPatrick Caulfield { 524063c4c99SLars Marowsky-Bree if (test_bit(CF_CLOSE, &con->flags)) 525063c4c99SLars Marowsky-Bree return; 5266ed7257bSPatrick Caulfield queue_work(send_workqueue, &con->swork); 52761d9102bSBob Peterson cond_resched(); 5286ed7257bSPatrick Caulfield } 5296ed7257bSPatrick Caulfield 5306ed7257bSPatrick Caulfield static void lowcomms_state_change(struct sock *sk) 5316ed7257bSPatrick Caulfield { 532ee44b4bcSMarcelo Ricardo Leitner /* SCTP layer is not calling sk_data_ready when the connection 533ee44b4bcSMarcelo Ricardo Leitner * is done, so we catch the signal through here. Also, it 534ee44b4bcSMarcelo Ricardo Leitner * doesn't switch socket state when entering shutdown, so we 535ee44b4bcSMarcelo Ricardo Leitner * skip the write in that case. 536ee44b4bcSMarcelo Ricardo Leitner */ 537ee44b4bcSMarcelo Ricardo Leitner if (sk->sk_shutdown) { 538ee44b4bcSMarcelo Ricardo Leitner if (sk->sk_shutdown == RCV_SHUTDOWN) 539ee44b4bcSMarcelo Ricardo Leitner lowcomms_data_ready(sk); 540ee44b4bcSMarcelo Ricardo Leitner } else if (sk->sk_state == TCP_ESTABLISHED) { 5416ed7257bSPatrick Caulfield lowcomms_write_space(sk); 5426ed7257bSPatrick Caulfield } 543ee44b4bcSMarcelo Ricardo Leitner } 5446ed7257bSPatrick Caulfield 545391fbdc5SChristine Caulfield int dlm_lowcomms_connect_node(int nodeid) 546391fbdc5SChristine Caulfield { 547391fbdc5SChristine Caulfield struct connection *con; 548b38bc9c2SAlexander Aring int idx; 549391fbdc5SChristine Caulfield 550391fbdc5SChristine Caulfield if (nodeid == dlm_our_nodeid()) 551391fbdc5SChristine Caulfield return 0; 552391fbdc5SChristine Caulfield 553b38bc9c2SAlexander Aring idx = srcu_read_lock(&connections_srcu); 554391fbdc5SChristine Caulfield con = nodeid2con(nodeid, GFP_NOFS); 555b38bc9c2SAlexander Aring if (!con) { 556b38bc9c2SAlexander Aring srcu_read_unlock(&connections_srcu, idx); 557391fbdc5SChristine Caulfield return -ENOMEM; 558b38bc9c2SAlexander Aring } 559b38bc9c2SAlexander Aring 560391fbdc5SChristine Caulfield lowcomms_connect_sock(con); 561b38bc9c2SAlexander Aring srcu_read_unlock(&connections_srcu, idx); 562b38bc9c2SAlexander Aring 563391fbdc5SChristine Caulfield return 0; 564391fbdc5SChristine Caulfield } 565391fbdc5SChristine Caulfield 566e125fbebSAlexander Aring int dlm_lowcomms_nodes_set_mark(int nodeid, unsigned int mark) 567e125fbebSAlexander Aring { 568e125fbebSAlexander Aring struct dlm_node_addr *na; 569e125fbebSAlexander Aring 570e125fbebSAlexander Aring spin_lock(&dlm_node_addrs_spin); 571e125fbebSAlexander Aring na = find_node_addr(nodeid); 572e125fbebSAlexander Aring if (!na) { 573e125fbebSAlexander Aring spin_unlock(&dlm_node_addrs_spin); 574e125fbebSAlexander Aring return -ENOENT; 575e125fbebSAlexander Aring } 576e125fbebSAlexander Aring 577e125fbebSAlexander Aring na->mark = mark; 578e125fbebSAlexander Aring spin_unlock(&dlm_node_addrs_spin); 579e125fbebSAlexander Aring 580e125fbebSAlexander Aring return 0; 581e125fbebSAlexander Aring } 582e125fbebSAlexander Aring 583b3a5bbfdSBob Peterson static void lowcomms_error_report(struct sock *sk) 584b3a5bbfdSBob Peterson { 585b81171cbSBob Peterson struct connection *con; 586b3a5bbfdSBob Peterson struct sockaddr_storage saddr; 587b81171cbSBob Peterson void (*orig_report)(struct sock *) = NULL; 588b3a5bbfdSBob Peterson 589b81171cbSBob Peterson read_lock_bh(&sk->sk_callback_lock); 590b81171cbSBob Peterson con = sock2con(sk); 591b81171cbSBob Peterson if (con == NULL) 592b81171cbSBob Peterson goto out; 593b81171cbSBob Peterson 594cc661fc9SBob Peterson orig_report = listen_sock.sk_error_report; 595feb704bdSAlexander Aring if (kernel_getpeername(sk->sk_socket, (struct sockaddr *)&saddr) < 0) { 596b3a5bbfdSBob Peterson printk_ratelimited(KERN_ERR "dlm: node %d: socket error " 597b3a5bbfdSBob Peterson "sending to node %d, port %d, " 598b3a5bbfdSBob Peterson "sk_err=%d/%d\n", dlm_our_nodeid(), 599b3a5bbfdSBob Peterson con->nodeid, dlm_config.ci_tcp_port, 600b3a5bbfdSBob Peterson sk->sk_err, sk->sk_err_soft); 601b3a5bbfdSBob Peterson } else if (saddr.ss_family == AF_INET) { 602b3a5bbfdSBob Peterson struct sockaddr_in *sin4 = (struct sockaddr_in *)&saddr; 603b3a5bbfdSBob Peterson 604b3a5bbfdSBob Peterson printk_ratelimited(KERN_ERR "dlm: node %d: socket error " 605b3a5bbfdSBob Peterson "sending to node %d at %pI4, port %d, " 606b3a5bbfdSBob Peterson "sk_err=%d/%d\n", dlm_our_nodeid(), 607b3a5bbfdSBob Peterson con->nodeid, &sin4->sin_addr.s_addr, 608b3a5bbfdSBob Peterson dlm_config.ci_tcp_port, sk->sk_err, 609b3a5bbfdSBob Peterson sk->sk_err_soft); 610b3a5bbfdSBob Peterson } else { 611b3a5bbfdSBob Peterson struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&saddr; 612b3a5bbfdSBob Peterson 613b3a5bbfdSBob Peterson printk_ratelimited(KERN_ERR "dlm: node %d: socket error " 614b3a5bbfdSBob Peterson "sending to node %d at %u.%u.%u.%u, " 615b3a5bbfdSBob Peterson "port %d, sk_err=%d/%d\n", dlm_our_nodeid(), 616b3a5bbfdSBob Peterson con->nodeid, sin6->sin6_addr.s6_addr32[0], 617b3a5bbfdSBob Peterson sin6->sin6_addr.s6_addr32[1], 618b3a5bbfdSBob Peterson sin6->sin6_addr.s6_addr32[2], 619b3a5bbfdSBob Peterson sin6->sin6_addr.s6_addr32[3], 620b3a5bbfdSBob Peterson dlm_config.ci_tcp_port, sk->sk_err, 621b3a5bbfdSBob Peterson sk->sk_err_soft); 622b3a5bbfdSBob Peterson } 623ba868d9dSAlexander Aring 624ba868d9dSAlexander Aring /* below sendcon only handling */ 625ba868d9dSAlexander Aring if (test_bit(CF_IS_OTHERCON, &con->flags)) 626ba868d9dSAlexander Aring con = con->sendcon; 627ba868d9dSAlexander Aring 628ba868d9dSAlexander Aring switch (sk->sk_err) { 629ba868d9dSAlexander Aring case ECONNREFUSED: 630ba868d9dSAlexander Aring set_bit(CF_DELAY_CONNECT, &con->flags); 631ba868d9dSAlexander Aring break; 632ba868d9dSAlexander Aring default: 633ba868d9dSAlexander Aring break; 634ba868d9dSAlexander Aring } 635ba868d9dSAlexander Aring 636ba868d9dSAlexander Aring if (!test_and_set_bit(CF_RECONNECT, &con->flags)) 637ba868d9dSAlexander Aring queue_work(send_workqueue, &con->swork); 638ba868d9dSAlexander Aring 639b81171cbSBob Peterson out: 640b81171cbSBob Peterson read_unlock_bh(&sk->sk_callback_lock); 641b81171cbSBob Peterson if (orig_report) 642b81171cbSBob Peterson orig_report(sk); 643b81171cbSBob Peterson } 644b81171cbSBob Peterson 645b81171cbSBob Peterson /* Note: sk_callback_lock must be locked before calling this function. */ 646cc661fc9SBob Peterson static void save_listen_callbacks(struct socket *sock) 647b81171cbSBob Peterson { 648cc661fc9SBob Peterson struct sock *sk = sock->sk; 649cc661fc9SBob Peterson 650cc661fc9SBob Peterson listen_sock.sk_data_ready = sk->sk_data_ready; 651cc661fc9SBob Peterson listen_sock.sk_state_change = sk->sk_state_change; 652cc661fc9SBob Peterson listen_sock.sk_write_space = sk->sk_write_space; 653cc661fc9SBob Peterson listen_sock.sk_error_report = sk->sk_error_report; 654b81171cbSBob Peterson } 655b81171cbSBob Peterson 656cc661fc9SBob Peterson static void restore_callbacks(struct socket *sock) 657b81171cbSBob Peterson { 658cc661fc9SBob Peterson struct sock *sk = sock->sk; 659cc661fc9SBob Peterson 660b81171cbSBob Peterson write_lock_bh(&sk->sk_callback_lock); 661b81171cbSBob Peterson sk->sk_user_data = NULL; 662cc661fc9SBob Peterson sk->sk_data_ready = listen_sock.sk_data_ready; 663cc661fc9SBob Peterson sk->sk_state_change = listen_sock.sk_state_change; 664cc661fc9SBob Peterson sk->sk_write_space = listen_sock.sk_write_space; 665cc661fc9SBob Peterson sk->sk_error_report = listen_sock.sk_error_report; 666b81171cbSBob Peterson write_unlock_bh(&sk->sk_callback_lock); 667b3a5bbfdSBob Peterson } 668b3a5bbfdSBob Peterson 669d11ccd45SAlexander Aring static void add_listen_sock(struct socket *sock, struct listen_connection *con) 670d11ccd45SAlexander Aring { 671d11ccd45SAlexander Aring struct sock *sk = sock->sk; 672d11ccd45SAlexander Aring 673d11ccd45SAlexander Aring write_lock_bh(&sk->sk_callback_lock); 674d11ccd45SAlexander Aring save_listen_callbacks(sock); 675d11ccd45SAlexander Aring con->sock = sock; 676d11ccd45SAlexander Aring 677d11ccd45SAlexander Aring sk->sk_user_data = con; 678d11ccd45SAlexander Aring sk->sk_allocation = GFP_NOFS; 679d11ccd45SAlexander Aring /* Install a data_ready callback */ 680d11ccd45SAlexander Aring sk->sk_data_ready = lowcomms_listen_data_ready; 681d11ccd45SAlexander Aring write_unlock_bh(&sk->sk_callback_lock); 682d11ccd45SAlexander Aring } 683d11ccd45SAlexander Aring 6846ed7257bSPatrick Caulfield /* Make a socket active */ 685988419a9Stsutomu.owa@toshiba.co.jp static void add_sock(struct socket *sock, struct connection *con) 6866ed7257bSPatrick Caulfield { 687b81171cbSBob Peterson struct sock *sk = sock->sk; 688b81171cbSBob Peterson 689b81171cbSBob Peterson write_lock_bh(&sk->sk_callback_lock); 6906ed7257bSPatrick Caulfield con->sock = sock; 6916ed7257bSPatrick Caulfield 692b81171cbSBob Peterson sk->sk_user_data = con; 6936ed7257bSPatrick Caulfield /* Install a data_ready callback */ 694b81171cbSBob Peterson sk->sk_data_ready = lowcomms_data_ready; 695b81171cbSBob Peterson sk->sk_write_space = lowcomms_write_space; 696b81171cbSBob Peterson sk->sk_state_change = lowcomms_state_change; 697b81171cbSBob Peterson sk->sk_allocation = GFP_NOFS; 698b81171cbSBob Peterson sk->sk_error_report = lowcomms_error_report; 699b81171cbSBob Peterson write_unlock_bh(&sk->sk_callback_lock); 7006ed7257bSPatrick Caulfield } 7016ed7257bSPatrick Caulfield 7026ed7257bSPatrick Caulfield /* Add the port number to an IPv6 or 4 sockaddr and return the address 7036ed7257bSPatrick Caulfield length */ 7046ed7257bSPatrick Caulfield static void make_sockaddr(struct sockaddr_storage *saddr, uint16_t port, 7056ed7257bSPatrick Caulfield int *addr_len) 7066ed7257bSPatrick Caulfield { 7076ed7257bSPatrick Caulfield saddr->ss_family = dlm_local_addr[0]->ss_family; 7086ed7257bSPatrick Caulfield if (saddr->ss_family == AF_INET) { 7096ed7257bSPatrick Caulfield struct sockaddr_in *in4_addr = (struct sockaddr_in *)saddr; 7106ed7257bSPatrick Caulfield in4_addr->sin_port = cpu_to_be16(port); 7116ed7257bSPatrick Caulfield *addr_len = sizeof(struct sockaddr_in); 7126ed7257bSPatrick Caulfield memset(&in4_addr->sin_zero, 0, sizeof(in4_addr->sin_zero)); 7136ed7257bSPatrick Caulfield } else { 7146ed7257bSPatrick Caulfield struct sockaddr_in6 *in6_addr = (struct sockaddr_in6 *)saddr; 7156ed7257bSPatrick Caulfield in6_addr->sin6_port = cpu_to_be16(port); 7166ed7257bSPatrick Caulfield *addr_len = sizeof(struct sockaddr_in6); 7176ed7257bSPatrick Caulfield } 71801c8cab2SPatrick Caulfield memset((char *)saddr + *addr_len, 0, sizeof(struct sockaddr_storage) - *addr_len); 7196ed7257bSPatrick Caulfield } 7206ed7257bSPatrick Caulfield 721706474fbSAlexander Aring static void dlm_page_release(struct kref *kref) 722706474fbSAlexander Aring { 723706474fbSAlexander Aring struct writequeue_entry *e = container_of(kref, struct writequeue_entry, 724706474fbSAlexander Aring ref); 725706474fbSAlexander Aring 726706474fbSAlexander Aring __free_page(e->page); 727706474fbSAlexander Aring kfree(e); 728706474fbSAlexander Aring } 729706474fbSAlexander Aring 730706474fbSAlexander Aring static void dlm_msg_release(struct kref *kref) 731706474fbSAlexander Aring { 732706474fbSAlexander Aring struct dlm_msg *msg = container_of(kref, struct dlm_msg, ref); 733706474fbSAlexander Aring 734706474fbSAlexander Aring kref_put(&msg->entry->ref, dlm_page_release); 735706474fbSAlexander Aring kfree(msg); 736706474fbSAlexander Aring } 737706474fbSAlexander Aring 738706474fbSAlexander Aring static void free_entry(struct writequeue_entry *e) 739706474fbSAlexander Aring { 740706474fbSAlexander Aring struct dlm_msg *msg, *tmp; 741706474fbSAlexander Aring 742706474fbSAlexander Aring list_for_each_entry_safe(msg, tmp, &e->msgs, list) { 743706474fbSAlexander Aring if (msg->orig_msg) { 744706474fbSAlexander Aring msg->orig_msg->retransmit = false; 745706474fbSAlexander Aring kref_put(&msg->orig_msg->ref, dlm_msg_release); 746706474fbSAlexander Aring } 747706474fbSAlexander Aring 748706474fbSAlexander Aring list_del(&msg->list); 749706474fbSAlexander Aring kref_put(&msg->ref, dlm_msg_release); 750706474fbSAlexander Aring } 751706474fbSAlexander Aring 752706474fbSAlexander Aring list_del(&e->list); 753706474fbSAlexander Aring atomic_dec(&e->con->writequeue_cnt); 754706474fbSAlexander Aring kref_put(&e->ref, dlm_page_release); 755706474fbSAlexander Aring } 756706474fbSAlexander Aring 757d11ccd45SAlexander Aring static void dlm_close_sock(struct socket **sock) 758d11ccd45SAlexander Aring { 759d11ccd45SAlexander Aring if (*sock) { 760d11ccd45SAlexander Aring restore_callbacks(*sock); 761d11ccd45SAlexander Aring sock_release(*sock); 762d11ccd45SAlexander Aring *sock = NULL; 763d11ccd45SAlexander Aring } 764d11ccd45SAlexander Aring } 765d11ccd45SAlexander Aring 7666ed7257bSPatrick Caulfield /* Close a remote connection and tidy up */ 7670d737a8cSMarcelo Ricardo Leitner static void close_connection(struct connection *con, bool and_other, 7680d737a8cSMarcelo Ricardo Leitner bool tx, bool rx) 7696ed7257bSPatrick Caulfield { 770b2a66629Stsutomu.owa@toshiba.co.jp bool closing = test_and_set_bit(CF_CLOSING, &con->flags); 771706474fbSAlexander Aring struct writequeue_entry *e; 772b2a66629Stsutomu.owa@toshiba.co.jp 7730aa18464Stsutomu.owa@toshiba.co.jp if (tx && !closing && cancel_work_sync(&con->swork)) { 7740d737a8cSMarcelo Ricardo Leitner log_print("canceled swork for node %d", con->nodeid); 7750aa18464Stsutomu.owa@toshiba.co.jp clear_bit(CF_WRITE_PENDING, &con->flags); 7760aa18464Stsutomu.owa@toshiba.co.jp } 7770aa18464Stsutomu.owa@toshiba.co.jp if (rx && !closing && cancel_work_sync(&con->rwork)) { 7780d737a8cSMarcelo Ricardo Leitner log_print("canceled rwork for node %d", con->nodeid); 7790aa18464Stsutomu.owa@toshiba.co.jp clear_bit(CF_READ_PENDING, &con->flags); 7800aa18464Stsutomu.owa@toshiba.co.jp } 7816ed7257bSPatrick Caulfield 7820d737a8cSMarcelo Ricardo Leitner mutex_lock(&con->sock_mutex); 783d11ccd45SAlexander Aring dlm_close_sock(&con->sock); 784d11ccd45SAlexander Aring 7856ed7257bSPatrick Caulfield if (con->othercon && and_other) { 7866ed7257bSPatrick Caulfield /* Will only re-enter once. */ 787c6aa00e3SAlexander Aring close_connection(con->othercon, false, tx, rx); 7886ed7257bSPatrick Caulfield } 7899e5f2825SPatrick Caulfield 790706474fbSAlexander Aring /* if we send a writequeue entry only a half way, we drop the 791706474fbSAlexander Aring * whole entry because reconnection and that we not start of the 792706474fbSAlexander Aring * middle of a msg which will confuse the other end. 793706474fbSAlexander Aring * 794706474fbSAlexander Aring * we can always drop messages because retransmits, but what we 795706474fbSAlexander Aring * cannot allow is to transmit half messages which may be processed 796706474fbSAlexander Aring * at the other side. 797706474fbSAlexander Aring * 798706474fbSAlexander Aring * our policy is to start on a clean state when disconnects, we don't 799706474fbSAlexander Aring * know what's send/received on transport layer in this case. 800706474fbSAlexander Aring */ 801706474fbSAlexander Aring spin_lock(&con->writequeue_lock); 802706474fbSAlexander Aring if (!list_empty(&con->writequeue)) { 803706474fbSAlexander Aring e = list_first_entry(&con->writequeue, struct writequeue_entry, 804706474fbSAlexander Aring list); 805706474fbSAlexander Aring if (e->dirty) 806706474fbSAlexander Aring free_entry(e); 807706474fbSAlexander Aring } 808706474fbSAlexander Aring spin_unlock(&con->writequeue_lock); 809706474fbSAlexander Aring 8104798cbbfSAlexander Aring con->rx_leftover = 0; 8116ed7257bSPatrick Caulfield con->retries = 0; 812052849beSAlexander Aring clear_bit(CF_APP_LIMITED, &con->flags); 81319633c7eSAlexander Aring clear_bit(CF_CONNECTED, &con->flags); 814ba868d9dSAlexander Aring clear_bit(CF_DELAY_CONNECT, &con->flags); 815ba868d9dSAlexander Aring clear_bit(CF_RECONNECT, &con->flags); 8168aa31cbfSAlexander Aring clear_bit(CF_EOF, &con->flags); 8176ed7257bSPatrick Caulfield mutex_unlock(&con->sock_mutex); 818b2a66629Stsutomu.owa@toshiba.co.jp clear_bit(CF_CLOSING, &con->flags); 8196ed7257bSPatrick Caulfield } 8206ed7257bSPatrick Caulfield 821055923bfSAlexander Aring static void shutdown_connection(struct connection *con) 822055923bfSAlexander Aring { 823055923bfSAlexander Aring int ret; 824055923bfSAlexander Aring 825eec054b5SAlexander Aring flush_work(&con->swork); 826055923bfSAlexander Aring 827055923bfSAlexander Aring mutex_lock(&con->sock_mutex); 828055923bfSAlexander Aring /* nothing to shutdown */ 829055923bfSAlexander Aring if (!con->sock) { 830055923bfSAlexander Aring mutex_unlock(&con->sock_mutex); 831055923bfSAlexander Aring return; 832055923bfSAlexander Aring } 833055923bfSAlexander Aring 834055923bfSAlexander Aring set_bit(CF_SHUTDOWN, &con->flags); 835055923bfSAlexander Aring ret = kernel_sock_shutdown(con->sock, SHUT_WR); 836055923bfSAlexander Aring mutex_unlock(&con->sock_mutex); 837055923bfSAlexander Aring if (ret) { 838055923bfSAlexander Aring log_print("Connection %p failed to shutdown: %d will force close", 839055923bfSAlexander Aring con, ret); 840055923bfSAlexander Aring goto force_close; 841055923bfSAlexander Aring } else { 842055923bfSAlexander Aring ret = wait_event_timeout(con->shutdown_wait, 843055923bfSAlexander Aring !test_bit(CF_SHUTDOWN, &con->flags), 844055923bfSAlexander Aring DLM_SHUTDOWN_WAIT_TIMEOUT); 845055923bfSAlexander Aring if (ret == 0) { 846055923bfSAlexander Aring log_print("Connection %p shutdown timed out, will force close", 847055923bfSAlexander Aring con); 848055923bfSAlexander Aring goto force_close; 849055923bfSAlexander Aring } 850055923bfSAlexander Aring } 851055923bfSAlexander Aring 852055923bfSAlexander Aring return; 853055923bfSAlexander Aring 854055923bfSAlexander Aring force_close: 855055923bfSAlexander Aring clear_bit(CF_SHUTDOWN, &con->flags); 856055923bfSAlexander Aring close_connection(con, false, true, true); 857055923bfSAlexander Aring } 858055923bfSAlexander Aring 859055923bfSAlexander Aring static void dlm_tcp_shutdown(struct connection *con) 860055923bfSAlexander Aring { 861055923bfSAlexander Aring if (con->othercon) 862055923bfSAlexander Aring shutdown_connection(con->othercon); 863055923bfSAlexander Aring shutdown_connection(con); 864055923bfSAlexander Aring } 865055923bfSAlexander Aring 8664798cbbfSAlexander Aring static int con_realloc_receive_buf(struct connection *con, int newlen) 8674798cbbfSAlexander Aring { 8684798cbbfSAlexander Aring unsigned char *newbuf; 8694798cbbfSAlexander Aring 8704798cbbfSAlexander Aring newbuf = kmalloc(newlen, GFP_NOFS); 8714798cbbfSAlexander Aring if (!newbuf) 8724798cbbfSAlexander Aring return -ENOMEM; 8734798cbbfSAlexander Aring 8744798cbbfSAlexander Aring /* copy any leftover from last receive */ 8754798cbbfSAlexander Aring if (con->rx_leftover) 8764798cbbfSAlexander Aring memmove(newbuf, con->rx_buf, con->rx_leftover); 8774798cbbfSAlexander Aring 8784798cbbfSAlexander Aring /* swap to new buffer space */ 8794798cbbfSAlexander Aring kfree(con->rx_buf); 8804798cbbfSAlexander Aring con->rx_buflen = newlen; 8814798cbbfSAlexander Aring con->rx_buf = newbuf; 8824798cbbfSAlexander Aring 8834798cbbfSAlexander Aring return 0; 8844798cbbfSAlexander Aring } 8854798cbbfSAlexander Aring 8866ed7257bSPatrick Caulfield /* Data received from remote end */ 8876ed7257bSPatrick Caulfield static int receive_from_sock(struct connection *con) 8886ed7257bSPatrick Caulfield { 8896ed7257bSPatrick Caulfield int call_again_soon = 0; 8904798cbbfSAlexander Aring struct msghdr msg; 8914798cbbfSAlexander Aring struct kvec iov; 8924798cbbfSAlexander Aring int ret, buflen; 8936ed7257bSPatrick Caulfield 8946ed7257bSPatrick Caulfield mutex_lock(&con->sock_mutex); 8956ed7257bSPatrick Caulfield 8966ed7257bSPatrick Caulfield if (con->sock == NULL) { 8976ed7257bSPatrick Caulfield ret = -EAGAIN; 8986ed7257bSPatrick Caulfield goto out_close; 8996ed7257bSPatrick Caulfield } 9004798cbbfSAlexander Aring 9014798cbbfSAlexander Aring /* realloc if we get new buffer size to read out */ 9024798cbbfSAlexander Aring buflen = dlm_config.ci_buffer_size; 9034798cbbfSAlexander Aring if (con->rx_buflen != buflen && con->rx_leftover <= buflen) { 9044798cbbfSAlexander Aring ret = con_realloc_receive_buf(con, buflen); 9054798cbbfSAlexander Aring if (ret < 0) 9066ed7257bSPatrick Caulfield goto out_resched; 9076ed7257bSPatrick Caulfield } 9086ed7257bSPatrick Caulfield 9094798cbbfSAlexander Aring /* calculate new buffer parameter regarding last receive and 9104798cbbfSAlexander Aring * possible leftover bytes 9116ed7257bSPatrick Caulfield */ 9124798cbbfSAlexander Aring iov.iov_base = con->rx_buf + con->rx_leftover; 9134798cbbfSAlexander Aring iov.iov_len = con->rx_buflen - con->rx_leftover; 9146ed7257bSPatrick Caulfield 9154798cbbfSAlexander Aring memset(&msg, 0, sizeof(msg)); 9164798cbbfSAlexander Aring msg.msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL; 9174798cbbfSAlexander Aring ret = kernel_recvmsg(con->sock, &msg, &iov, 1, iov.iov_len, 9184798cbbfSAlexander Aring msg.msg_flags); 9196ed7257bSPatrick Caulfield if (ret <= 0) 9206ed7257bSPatrick Caulfield goto out_close; 9214798cbbfSAlexander Aring else if (ret == iov.iov_len) 922ee44b4bcSMarcelo Ricardo Leitner call_again_soon = 1; 9236ed7257bSPatrick Caulfield 9244798cbbfSAlexander Aring /* new buflen according readed bytes and leftover from last receive */ 9254798cbbfSAlexander Aring buflen = ret + con->rx_leftover; 9264798cbbfSAlexander Aring ret = dlm_process_incoming_buffer(con->nodeid, con->rx_buf, buflen); 9274798cbbfSAlexander Aring if (ret < 0) 9284798cbbfSAlexander Aring goto out_close; 9296ed7257bSPatrick Caulfield 9304798cbbfSAlexander Aring /* calculate leftover bytes from process and put it into begin of 9314798cbbfSAlexander Aring * the receive buffer, so next receive we have the full message 9324798cbbfSAlexander Aring * at the start address of the receive buffer. 9334798cbbfSAlexander Aring */ 9344798cbbfSAlexander Aring con->rx_leftover = buflen - ret; 9354798cbbfSAlexander Aring if (con->rx_leftover) { 9364798cbbfSAlexander Aring memmove(con->rx_buf, con->rx_buf + ret, 9374798cbbfSAlexander Aring con->rx_leftover); 9384798cbbfSAlexander Aring call_again_soon = true; 9396ed7257bSPatrick Caulfield } 9406ed7257bSPatrick Caulfield 9416ed7257bSPatrick Caulfield if (call_again_soon) 9426ed7257bSPatrick Caulfield goto out_resched; 9434798cbbfSAlexander Aring 9446ed7257bSPatrick Caulfield mutex_unlock(&con->sock_mutex); 9456ed7257bSPatrick Caulfield return 0; 9466ed7257bSPatrick Caulfield 9476ed7257bSPatrick Caulfield out_resched: 9486ed7257bSPatrick Caulfield if (!test_and_set_bit(CF_READ_PENDING, &con->flags)) 9496ed7257bSPatrick Caulfield queue_work(recv_workqueue, &con->rwork); 9506ed7257bSPatrick Caulfield mutex_unlock(&con->sock_mutex); 9516ed7257bSPatrick Caulfield return -EAGAIN; 9526ed7257bSPatrick Caulfield 9536ed7257bSPatrick Caulfield out_close: 954055923bfSAlexander Aring if (ret == 0) { 955055923bfSAlexander Aring log_print("connection %p got EOF from %d", 956055923bfSAlexander Aring con, con->nodeid); 9578aa31cbfSAlexander Aring 958*a66c008cSAlexander Aring if (dlm_proto_ops->eof_condition && 959*a66c008cSAlexander Aring dlm_proto_ops->eof_condition(con)) { 9608aa31cbfSAlexander Aring set_bit(CF_EOF, &con->flags); 9618aa31cbfSAlexander Aring mutex_unlock(&con->sock_mutex); 9628aa31cbfSAlexander Aring } else { 9638aa31cbfSAlexander Aring mutex_unlock(&con->sock_mutex); 9648aa31cbfSAlexander Aring close_connection(con, false, true, false); 9658aa31cbfSAlexander Aring 966055923bfSAlexander Aring /* handling for tcp shutdown */ 967055923bfSAlexander Aring clear_bit(CF_SHUTDOWN, &con->flags); 968055923bfSAlexander Aring wake_up(&con->shutdown_wait); 9698aa31cbfSAlexander Aring } 9708aa31cbfSAlexander Aring 971055923bfSAlexander Aring /* signal to breaking receive worker */ 972055923bfSAlexander Aring ret = -1; 9738aa31cbfSAlexander Aring } else { 9748aa31cbfSAlexander Aring mutex_unlock(&con->sock_mutex); 9756ed7257bSPatrick Caulfield } 9766ed7257bSPatrick Caulfield return ret; 9776ed7257bSPatrick Caulfield } 9786ed7257bSPatrick Caulfield 9796ed7257bSPatrick Caulfield /* Listening socket is busy, accept a connection */ 980d11ccd45SAlexander Aring static int accept_from_sock(struct listen_connection *con) 9816ed7257bSPatrick Caulfield { 9826ed7257bSPatrick Caulfield int result; 9836ed7257bSPatrick Caulfield struct sockaddr_storage peeraddr; 9846ed7257bSPatrick Caulfield struct socket *newsock; 985b38bc9c2SAlexander Aring int len, idx; 9866ed7257bSPatrick Caulfield int nodeid; 9876ed7257bSPatrick Caulfield struct connection *newcon; 9886ed7257bSPatrick Caulfield struct connection *addcon; 9893f78cd7dSAlexander Aring unsigned int mark; 9906ed7257bSPatrick Caulfield 991d11ccd45SAlexander Aring if (!con->sock) 9923421fb15Stsutomu.owa@toshiba.co.jp return -ENOTCONN; 9936ed7257bSPatrick Caulfield 9943421fb15Stsutomu.owa@toshiba.co.jp result = kernel_accept(con->sock, &newsock, O_NONBLOCK); 9956ed7257bSPatrick Caulfield if (result < 0) 9966ed7257bSPatrick Caulfield goto accept_err; 9976ed7257bSPatrick Caulfield 9986ed7257bSPatrick Caulfield /* Get the connected socket's peer */ 9996ed7257bSPatrick Caulfield memset(&peeraddr, 0, sizeof(peeraddr)); 10009b2c45d4SDenys Vlasenko len = newsock->ops->getname(newsock, (struct sockaddr *)&peeraddr, 2); 10019b2c45d4SDenys Vlasenko if (len < 0) { 10026ed7257bSPatrick Caulfield result = -ECONNABORTED; 10036ed7257bSPatrick Caulfield goto accept_err; 10046ed7257bSPatrick Caulfield } 10056ed7257bSPatrick Caulfield 10066ed7257bSPatrick Caulfield /* Get the new node's NODEID */ 10076ed7257bSPatrick Caulfield make_sockaddr(&peeraddr, 0, &len); 1008e125fbebSAlexander Aring if (addr_to_nodeid(&peeraddr, &nodeid, &mark)) { 1009bcaadf5cSMasatake YAMATO unsigned char *b=(unsigned char *)&peeraddr; 1010617e82e1SDavid Teigland log_print("connect from non cluster node"); 1011bcaadf5cSMasatake YAMATO print_hex_dump_bytes("ss: ", DUMP_PREFIX_NONE, 1012bcaadf5cSMasatake YAMATO b, sizeof(struct sockaddr_storage)); 10136ed7257bSPatrick Caulfield sock_release(newsock); 10146ed7257bSPatrick Caulfield return -1; 10156ed7257bSPatrick Caulfield } 10166ed7257bSPatrick Caulfield 10176ed7257bSPatrick Caulfield log_print("got connection from %d", nodeid); 10186ed7257bSPatrick Caulfield 10196ed7257bSPatrick Caulfield /* Check to see if we already have a connection to this node. This 10206ed7257bSPatrick Caulfield * could happen if the two nodes initiate a connection at roughly 10216ed7257bSPatrick Caulfield * the same time and the connections cross on the wire. 10226ed7257bSPatrick Caulfield * In this case we store the incoming one in "othercon" 10236ed7257bSPatrick Caulfield */ 1024b38bc9c2SAlexander Aring idx = srcu_read_lock(&connections_srcu); 1025748285ccSDavid Teigland newcon = nodeid2con(nodeid, GFP_NOFS); 10266ed7257bSPatrick Caulfield if (!newcon) { 1027b38bc9c2SAlexander Aring srcu_read_unlock(&connections_srcu, idx); 10286ed7257bSPatrick Caulfield result = -ENOMEM; 10296ed7257bSPatrick Caulfield goto accept_err; 10306ed7257bSPatrick Caulfield } 1031d11ccd45SAlexander Aring 1032e125fbebSAlexander Aring sock_set_mark(newsock->sk, mark); 1033e125fbebSAlexander Aring 1034d11ccd45SAlexander Aring mutex_lock(&newcon->sock_mutex); 10356ed7257bSPatrick Caulfield if (newcon->sock) { 10366ed7257bSPatrick Caulfield struct connection *othercon = newcon->othercon; 10376ed7257bSPatrick Caulfield 10386ed7257bSPatrick Caulfield if (!othercon) { 1039a47666ebSAlexander Aring othercon = kzalloc(sizeof(*othercon), GFP_NOFS); 10406ed7257bSPatrick Caulfield if (!othercon) { 1041617e82e1SDavid Teigland log_print("failed to allocate incoming socket"); 10426ed7257bSPatrick Caulfield mutex_unlock(&newcon->sock_mutex); 1043b38bc9c2SAlexander Aring srcu_read_unlock(&connections_srcu, idx); 10446ed7257bSPatrick Caulfield result = -ENOMEM; 10456ed7257bSPatrick Caulfield goto accept_err; 10466ed7257bSPatrick Caulfield } 10474798cbbfSAlexander Aring 10486cde210aSAlexander Aring result = dlm_con_init(othercon, nodeid); 10496cde210aSAlexander Aring if (result < 0) { 10504798cbbfSAlexander Aring kfree(othercon); 10512fd8db2dSYang Yingliang mutex_unlock(&newcon->sock_mutex); 1052b38bc9c2SAlexander Aring srcu_read_unlock(&connections_srcu, idx); 10534798cbbfSAlexander Aring goto accept_err; 10544798cbbfSAlexander Aring } 10554798cbbfSAlexander Aring 1056e9a470acSAlexander Aring lockdep_set_subclass(&othercon->sock_mutex, 1); 10577443bc96SAlexander Aring set_bit(CF_IS_OTHERCON, &othercon->flags); 10586cde210aSAlexander Aring newcon->othercon = othercon; 1059ba868d9dSAlexander Aring othercon->sendcon = newcon; 1060ba3ab3caSAlexander Aring } else { 1061ba3ab3caSAlexander Aring /* close other sock con if we have something new */ 1062ba3ab3caSAlexander Aring close_connection(othercon, false, true, false); 106361d96be0SPatrick Caulfield } 1064ba3ab3caSAlexander Aring 1065e9a470acSAlexander Aring mutex_lock(&othercon->sock_mutex); 1066988419a9Stsutomu.owa@toshiba.co.jp add_sock(newsock, othercon); 10676ed7257bSPatrick Caulfield addcon = othercon; 1068c7355827Stsutomu.owa@toshiba.co.jp mutex_unlock(&othercon->sock_mutex); 10696ed7257bSPatrick Caulfield } 10706ed7257bSPatrick Caulfield else { 10713735b4b9SBob Peterson /* accept copies the sk after we've saved the callbacks, so we 10723735b4b9SBob Peterson don't want to save them a second time or comm errors will 10733735b4b9SBob Peterson result in calling sk_error_report recursively. */ 1074988419a9Stsutomu.owa@toshiba.co.jp add_sock(newsock, newcon); 10756ed7257bSPatrick Caulfield addcon = newcon; 10766ed7257bSPatrick Caulfield } 10776ed7257bSPatrick Caulfield 1078b30a624fSAlexander Aring set_bit(CF_CONNECTED, &addcon->flags); 10796ed7257bSPatrick Caulfield mutex_unlock(&newcon->sock_mutex); 10806ed7257bSPatrick Caulfield 10816ed7257bSPatrick Caulfield /* 10826ed7257bSPatrick Caulfield * Add it to the active queue in case we got data 108325985edcSLucas De Marchi * between processing the accept adding the socket 10846ed7257bSPatrick Caulfield * to the read_sockets list 10856ed7257bSPatrick Caulfield */ 10866ed7257bSPatrick Caulfield if (!test_and_set_bit(CF_READ_PENDING, &addcon->flags)) 10876ed7257bSPatrick Caulfield queue_work(recv_workqueue, &addcon->rwork); 10886ed7257bSPatrick Caulfield 1089b38bc9c2SAlexander Aring srcu_read_unlock(&connections_srcu, idx); 1090b38bc9c2SAlexander Aring 10916ed7257bSPatrick Caulfield return 0; 10926ed7257bSPatrick Caulfield 10936ed7257bSPatrick Caulfield accept_err: 10943421fb15Stsutomu.owa@toshiba.co.jp if (newsock) 10956ed7257bSPatrick Caulfield sock_release(newsock); 10966ed7257bSPatrick Caulfield 10976ed7257bSPatrick Caulfield if (result != -EAGAIN) 1098617e82e1SDavid Teigland log_print("error accepting connection from node: %d", result); 10996ed7257bSPatrick Caulfield return result; 11006ed7257bSPatrick Caulfield } 11016ed7257bSPatrick Caulfield 11025d689871SMike Christie /* 11035d689871SMike Christie * writequeue_entry_complete - try to delete and free write queue entry 11045d689871SMike Christie * @e: write queue entry to try to delete 11055d689871SMike Christie * @completed: bytes completed 11065d689871SMike Christie * 11075d689871SMike Christie * writequeue_lock must be held. 11085d689871SMike Christie */ 11095d689871SMike Christie static void writequeue_entry_complete(struct writequeue_entry *e, int completed) 11105d689871SMike Christie { 11115d689871SMike Christie e->offset += completed; 11125d689871SMike Christie e->len -= completed; 1113706474fbSAlexander Aring /* signal that page was half way transmitted */ 1114706474fbSAlexander Aring e->dirty = true; 11155d689871SMike Christie 11168f2dc78dSAlexander Aring if (e->len == 0 && e->users == 0) 11175d689871SMike Christie free_entry(e); 11185d689871SMike Christie } 11195d689871SMike Christie 1120ee44b4bcSMarcelo Ricardo Leitner /* 1121ee44b4bcSMarcelo Ricardo Leitner * sctp_bind_addrs - bind a SCTP socket to all our addresses 1122ee44b4bcSMarcelo Ricardo Leitner */ 112313004e8aSAlexander Aring static int sctp_bind_addrs(struct socket *sock, uint16_t port) 1124ee44b4bcSMarcelo Ricardo Leitner { 1125ee44b4bcSMarcelo Ricardo Leitner struct sockaddr_storage localaddr; 1126c0425a42SChristoph Hellwig struct sockaddr *addr = (struct sockaddr *)&localaddr; 1127ee44b4bcSMarcelo Ricardo Leitner int i, addr_len, result = 0; 1128ee44b4bcSMarcelo Ricardo Leitner 1129ee44b4bcSMarcelo Ricardo Leitner for (i = 0; i < dlm_local_count; i++) { 1130ee44b4bcSMarcelo Ricardo Leitner memcpy(&localaddr, dlm_local_addr[i], sizeof(localaddr)); 1131ee44b4bcSMarcelo Ricardo Leitner make_sockaddr(&localaddr, port, &addr_len); 1132ee44b4bcSMarcelo Ricardo Leitner 1133ee44b4bcSMarcelo Ricardo Leitner if (!i) 113413004e8aSAlexander Aring result = kernel_bind(sock, addr, addr_len); 1135ee44b4bcSMarcelo Ricardo Leitner else 113613004e8aSAlexander Aring result = sock_bind_add(sock->sk, addr, addr_len); 1137ee44b4bcSMarcelo Ricardo Leitner 1138ee44b4bcSMarcelo Ricardo Leitner if (result < 0) { 1139ee44b4bcSMarcelo Ricardo Leitner log_print("Can't bind to %d addr number %d, %d.\n", 1140ee44b4bcSMarcelo Ricardo Leitner port, i + 1, result); 1141ee44b4bcSMarcelo Ricardo Leitner break; 1142ee44b4bcSMarcelo Ricardo Leitner } 1143ee44b4bcSMarcelo Ricardo Leitner } 1144ee44b4bcSMarcelo Ricardo Leitner return result; 1145ee44b4bcSMarcelo Ricardo Leitner } 1146ee44b4bcSMarcelo Ricardo Leitner 11476ed7257bSPatrick Caulfield /* Initiate an SCTP association. 11486ed7257bSPatrick Caulfield This is a special case of send_to_sock() in that we don't yet have a 11496ed7257bSPatrick Caulfield peeled-off socket for this association, so we use the listening socket 11506ed7257bSPatrick Caulfield and add the primary IP address of the remote node. 11516ed7257bSPatrick Caulfield */ 1152ee44b4bcSMarcelo Ricardo Leitner static void sctp_connect_to_sock(struct connection *con) 11536ed7257bSPatrick Caulfield { 1154ee44b4bcSMarcelo Ricardo Leitner struct sockaddr_storage daddr; 1155ee44b4bcSMarcelo Ricardo Leitner int result; 1156ee44b4bcSMarcelo Ricardo Leitner int addr_len; 1157ee44b4bcSMarcelo Ricardo Leitner struct socket *sock; 11589c9f168fSAlexander Aring unsigned int mark; 1159ee44b4bcSMarcelo Ricardo Leitner 11605d689871SMike Christie mutex_lock(&con->sock_mutex); 11616ed7257bSPatrick Caulfield 1162ee44b4bcSMarcelo Ricardo Leitner /* Some odd races can cause double-connects, ignore them */ 1163ee44b4bcSMarcelo Ricardo Leitner if (con->retries++ > MAX_CONNECT_RETRIES) 1164ee44b4bcSMarcelo Ricardo Leitner goto out; 1165ee44b4bcSMarcelo Ricardo Leitner 1166ee44b4bcSMarcelo Ricardo Leitner if (con->sock) { 1167ee44b4bcSMarcelo Ricardo Leitner log_print("node %d already connected.", con->nodeid); 1168ee44b4bcSMarcelo Ricardo Leitner goto out; 1169ee44b4bcSMarcelo Ricardo Leitner } 1170ee44b4bcSMarcelo Ricardo Leitner 1171ee44b4bcSMarcelo Ricardo Leitner memset(&daddr, 0, sizeof(daddr)); 1172e125fbebSAlexander Aring result = nodeid_to_addr(con->nodeid, &daddr, NULL, true, &mark); 1173ee44b4bcSMarcelo Ricardo Leitner if (result < 0) { 11746ed7257bSPatrick Caulfield log_print("no address for nodeid %d", con->nodeid); 1175ee44b4bcSMarcelo Ricardo Leitner goto out; 117604bedd79SDavid Teigland } 11776ed7257bSPatrick Caulfield 1178ee44b4bcSMarcelo Ricardo Leitner /* Create a socket to communicate with */ 1179ee44b4bcSMarcelo Ricardo Leitner result = sock_create_kern(&init_net, dlm_local_addr[0]->ss_family, 1180ee44b4bcSMarcelo Ricardo Leitner SOCK_STREAM, IPPROTO_SCTP, &sock); 1181ee44b4bcSMarcelo Ricardo Leitner if (result < 0) 1182ee44b4bcSMarcelo Ricardo Leitner goto socket_err; 11836ed7257bSPatrick Caulfield 11849c9f168fSAlexander Aring sock_set_mark(sock->sk, mark); 11859c9f168fSAlexander Aring 1186988419a9Stsutomu.owa@toshiba.co.jp add_sock(sock, con); 11876ed7257bSPatrick Caulfield 1188ee44b4bcSMarcelo Ricardo Leitner /* Bind to all addresses. */ 118913004e8aSAlexander Aring if (sctp_bind_addrs(con->sock, 0)) 1190ee44b4bcSMarcelo Ricardo Leitner goto bind_err; 119198e1b60eSMike Christie 1192ee44b4bcSMarcelo Ricardo Leitner make_sockaddr(&daddr, dlm_config.ci_tcp_port, &addr_len); 11936ed7257bSPatrick Caulfield 11942df6b762SAlexander Aring log_print_ratelimited("connecting to %d", con->nodeid); 11956ed7257bSPatrick Caulfield 1196ee44b4bcSMarcelo Ricardo Leitner /* Turn off Nagle's algorithm */ 119740ef92c6SChristoph Hellwig sctp_sock_set_nodelay(sock->sk); 1198ee44b4bcSMarcelo Ricardo Leitner 1199f706d830SGang He /* 1200f706d830SGang He * Make sock->ops->connect() function return in specified time, 1201f706d830SGang He * since O_NONBLOCK argument in connect() function does not work here, 1202f706d830SGang He * then, we should restore the default value of this attribute. 1203f706d830SGang He */ 120476ee0785SChristoph Hellwig sock_set_sndtimeo(sock->sk, 5); 1205ee44b4bcSMarcelo Ricardo Leitner result = sock->ops->connect(sock, (struct sockaddr *)&daddr, addr_len, 1206da3627c3SGang He 0); 120776ee0785SChristoph Hellwig sock_set_sndtimeo(sock->sk, 0); 1208f706d830SGang He 1209ee44b4bcSMarcelo Ricardo Leitner if (result == -EINPROGRESS) 1210ee44b4bcSMarcelo Ricardo Leitner result = 0; 121119633c7eSAlexander Aring if (result == 0) { 121219633c7eSAlexander Aring if (!test_and_set_bit(CF_CONNECTED, &con->flags)) 121319633c7eSAlexander Aring log_print("successful connected to node %d", con->nodeid); 1214ee44b4bcSMarcelo Ricardo Leitner goto out; 121519633c7eSAlexander Aring } 1216ee44b4bcSMarcelo Ricardo Leitner 1217ee44b4bcSMarcelo Ricardo Leitner bind_err: 1218ee44b4bcSMarcelo Ricardo Leitner con->sock = NULL; 1219ee44b4bcSMarcelo Ricardo Leitner sock_release(sock); 1220ee44b4bcSMarcelo Ricardo Leitner 1221ee44b4bcSMarcelo Ricardo Leitner socket_err: 1222ee44b4bcSMarcelo Ricardo Leitner /* 1223ee44b4bcSMarcelo Ricardo Leitner * Some errors are fatal and this list might need adjusting. For other 1224ee44b4bcSMarcelo Ricardo Leitner * errors we try again until the max number of retries is reached. 1225ee44b4bcSMarcelo Ricardo Leitner */ 1226ee44b4bcSMarcelo Ricardo Leitner if (result != -EHOSTUNREACH && 1227ee44b4bcSMarcelo Ricardo Leitner result != -ENETUNREACH && 1228ee44b4bcSMarcelo Ricardo Leitner result != -ENETDOWN && 1229ee44b4bcSMarcelo Ricardo Leitner result != -EINVAL && 1230ee44b4bcSMarcelo Ricardo Leitner result != -EPROTONOSUPPORT) { 1231ee44b4bcSMarcelo Ricardo Leitner log_print("connect %d try %d error %d", con->nodeid, 1232ee44b4bcSMarcelo Ricardo Leitner con->retries, result); 1233ee44b4bcSMarcelo Ricardo Leitner mutex_unlock(&con->sock_mutex); 1234ee44b4bcSMarcelo Ricardo Leitner msleep(1000); 1235ee44b4bcSMarcelo Ricardo Leitner lowcomms_connect_sock(con); 1236ee44b4bcSMarcelo Ricardo Leitner return; 12376ed7257bSPatrick Caulfield } 12385d689871SMike Christie 1239ee44b4bcSMarcelo Ricardo Leitner out: 12405d689871SMike Christie mutex_unlock(&con->sock_mutex); 12416ed7257bSPatrick Caulfield } 12426ed7257bSPatrick Caulfield 12436ed7257bSPatrick Caulfield /* Connect a new socket to its peer */ 12446ed7257bSPatrick Caulfield static void tcp_connect_to_sock(struct connection *con) 12456ed7257bSPatrick Caulfield { 12466bd8fedaSLon Hohberger struct sockaddr_storage saddr, src_addr; 1247e125fbebSAlexander Aring unsigned int mark; 12486ed7257bSPatrick Caulfield int addr_len; 1249a89d63a1SCasey Dahlin struct socket *sock = NULL; 125036b71a8bSDavid Teigland int result; 12516ed7257bSPatrick Caulfield 12526ed7257bSPatrick Caulfield mutex_lock(&con->sock_mutex); 12536ed7257bSPatrick Caulfield if (con->retries++ > MAX_CONNECT_RETRIES) 12546ed7257bSPatrick Caulfield goto out; 12556ed7257bSPatrick Caulfield 12566ed7257bSPatrick Caulfield /* Some odd races can cause double-connects, ignore them */ 125736b71a8bSDavid Teigland if (con->sock) 12586ed7257bSPatrick Caulfield goto out; 12596ed7257bSPatrick Caulfield 12606ed7257bSPatrick Caulfield /* Create a socket to communicate with */ 1261eeb1bd5cSEric W. Biederman result = sock_create_kern(&init_net, dlm_local_addr[0]->ss_family, 1262eeb1bd5cSEric W. Biederman SOCK_STREAM, IPPROTO_TCP, &sock); 12636ed7257bSPatrick Caulfield if (result < 0) 12646ed7257bSPatrick Caulfield goto out_err; 12656ed7257bSPatrick Caulfield 12666ed7257bSPatrick Caulfield memset(&saddr, 0, sizeof(saddr)); 1267e125fbebSAlexander Aring result = nodeid_to_addr(con->nodeid, &saddr, NULL, false, &mark); 126836b71a8bSDavid Teigland if (result < 0) { 126936b71a8bSDavid Teigland log_print("no address for nodeid %d", con->nodeid); 12706ed7257bSPatrick Caulfield goto out_err; 127136b71a8bSDavid Teigland } 12726ed7257bSPatrick Caulfield 1273e125fbebSAlexander Aring sock_set_mark(sock->sk, mark); 1274e125fbebSAlexander Aring 1275988419a9Stsutomu.owa@toshiba.co.jp add_sock(sock, con); 12766ed7257bSPatrick Caulfield 12776bd8fedaSLon Hohberger /* Bind to our cluster-known address connecting to avoid 12786bd8fedaSLon Hohberger routing problems */ 12796bd8fedaSLon Hohberger memcpy(&src_addr, dlm_local_addr[0], sizeof(src_addr)); 12806bd8fedaSLon Hohberger make_sockaddr(&src_addr, 0, &addr_len); 12816bd8fedaSLon Hohberger result = sock->ops->bind(sock, (struct sockaddr *) &src_addr, 12826bd8fedaSLon Hohberger addr_len); 12836bd8fedaSLon Hohberger if (result < 0) { 12846bd8fedaSLon Hohberger log_print("could not bind for connect: %d", result); 12856bd8fedaSLon Hohberger /* This *may* not indicate a critical error */ 12866bd8fedaSLon Hohberger } 12876bd8fedaSLon Hohberger 12886ed7257bSPatrick Caulfield make_sockaddr(&saddr, dlm_config.ci_tcp_port, &addr_len); 12896ed7257bSPatrick Caulfield 12902df6b762SAlexander Aring log_print_ratelimited("connecting to %d", con->nodeid); 1291cb2d45daSDavid Teigland 1292cb2d45daSDavid Teigland /* Turn off Nagle's algorithm */ 129312abc5eeSChristoph Hellwig tcp_sock_set_nodelay(sock->sk); 1294cb2d45daSDavid Teigland 129536b71a8bSDavid Teigland result = sock->ops->connect(sock, (struct sockaddr *)&saddr, addr_len, 12966ed7257bSPatrick Caulfield O_NONBLOCK); 12976ed7257bSPatrick Caulfield if (result == -EINPROGRESS) 12986ed7257bSPatrick Caulfield result = 0; 12996ed7257bSPatrick Caulfield if (result == 0) 13006ed7257bSPatrick Caulfield goto out; 13016ed7257bSPatrick Caulfield 13026ed7257bSPatrick Caulfield out_err: 13036ed7257bSPatrick Caulfield if (con->sock) { 13046ed7257bSPatrick Caulfield sock_release(con->sock); 13056ed7257bSPatrick Caulfield con->sock = NULL; 1306a89d63a1SCasey Dahlin } else if (sock) { 1307a89d63a1SCasey Dahlin sock_release(sock); 13086ed7257bSPatrick Caulfield } 13096ed7257bSPatrick Caulfield /* 13106ed7257bSPatrick Caulfield * Some errors are fatal and this list might need adjusting. For other 13116ed7257bSPatrick Caulfield * errors we try again until the max number of retries is reached. 13126ed7257bSPatrick Caulfield */ 131336b71a8bSDavid Teigland if (result != -EHOSTUNREACH && 131436b71a8bSDavid Teigland result != -ENETUNREACH && 131536b71a8bSDavid Teigland result != -ENETDOWN && 131636b71a8bSDavid Teigland result != -EINVAL && 131736b71a8bSDavid Teigland result != -EPROTONOSUPPORT) { 131836b71a8bSDavid Teigland log_print("connect %d try %d error %d", con->nodeid, 131936b71a8bSDavid Teigland con->retries, result); 132036b71a8bSDavid Teigland mutex_unlock(&con->sock_mutex); 132136b71a8bSDavid Teigland msleep(1000); 13226ed7257bSPatrick Caulfield lowcomms_connect_sock(con); 132336b71a8bSDavid Teigland return; 13246ed7257bSPatrick Caulfield } 13256ed7257bSPatrick Caulfield out: 13266ed7257bSPatrick Caulfield mutex_unlock(&con->sock_mutex); 13276ed7257bSPatrick Caulfield return; 13286ed7257bSPatrick Caulfield } 13296ed7257bSPatrick Caulfield 1330d11ccd45SAlexander Aring /* On error caller must run dlm_close_sock() for the 1331d11ccd45SAlexander Aring * listen connection socket. 1332d11ccd45SAlexander Aring */ 1333d11ccd45SAlexander Aring static int tcp_create_listen_sock(struct listen_connection *con, 13346ed7257bSPatrick Caulfield struct sockaddr_storage *saddr) 13356ed7257bSPatrick Caulfield { 13366ed7257bSPatrick Caulfield struct socket *sock = NULL; 13376ed7257bSPatrick Caulfield int result = 0; 13386ed7257bSPatrick Caulfield int addr_len; 13396ed7257bSPatrick Caulfield 13406ed7257bSPatrick Caulfield if (dlm_local_addr[0]->ss_family == AF_INET) 13416ed7257bSPatrick Caulfield addr_len = sizeof(struct sockaddr_in); 13426ed7257bSPatrick Caulfield else 13436ed7257bSPatrick Caulfield addr_len = sizeof(struct sockaddr_in6); 13446ed7257bSPatrick Caulfield 13456ed7257bSPatrick Caulfield /* Create a socket to communicate with */ 1346eeb1bd5cSEric W. Biederman result = sock_create_kern(&init_net, dlm_local_addr[0]->ss_family, 1347eeb1bd5cSEric W. Biederman SOCK_STREAM, IPPROTO_TCP, &sock); 13486ed7257bSPatrick Caulfield if (result < 0) { 1349617e82e1SDavid Teigland log_print("Can't create listening comms socket"); 13506ed7257bSPatrick Caulfield goto create_out; 13516ed7257bSPatrick Caulfield } 13526ed7257bSPatrick Caulfield 1353a5b7ab63SAlexander Aring sock_set_mark(sock->sk, dlm_config.ci_mark); 1354a5b7ab63SAlexander Aring 1355cb2d45daSDavid Teigland /* Turn off Nagle's algorithm */ 135612abc5eeSChristoph Hellwig tcp_sock_set_nodelay(sock->sk); 1357cb2d45daSDavid Teigland 1358b58f0e8fSChristoph Hellwig sock_set_reuseaddr(sock->sk); 13596ed7257bSPatrick Caulfield 1360d11ccd45SAlexander Aring add_listen_sock(sock, con); 13616ed7257bSPatrick Caulfield 13626ed7257bSPatrick Caulfield /* Bind to our port */ 13636ed7257bSPatrick Caulfield make_sockaddr(saddr, dlm_config.ci_tcp_port, &addr_len); 13646ed7257bSPatrick Caulfield result = sock->ops->bind(sock, (struct sockaddr *) saddr, addr_len); 13656ed7257bSPatrick Caulfield if (result < 0) { 1366617e82e1SDavid Teigland log_print("Can't bind to port %d", dlm_config.ci_tcp_port); 13676ed7257bSPatrick Caulfield goto create_out; 13686ed7257bSPatrick Caulfield } 1369ce3d9544SChristoph Hellwig sock_set_keepalive(sock->sk); 13706ed7257bSPatrick Caulfield 13716ed7257bSPatrick Caulfield result = sock->ops->listen(sock, 5); 13726ed7257bSPatrick Caulfield if (result < 0) { 1373617e82e1SDavid Teigland log_print("Can't listen on port %d", dlm_config.ci_tcp_port); 13746ed7257bSPatrick Caulfield goto create_out; 13756ed7257bSPatrick Caulfield } 13766ed7257bSPatrick Caulfield 1377d11ccd45SAlexander Aring return 0; 1378d11ccd45SAlexander Aring 13796ed7257bSPatrick Caulfield create_out: 1380d11ccd45SAlexander Aring return result; 13816ed7257bSPatrick Caulfield } 13826ed7257bSPatrick Caulfield 13836ed7257bSPatrick Caulfield /* Get local addresses */ 13846ed7257bSPatrick Caulfield static void init_local(void) 13856ed7257bSPatrick Caulfield { 13866ed7257bSPatrick Caulfield struct sockaddr_storage sas, *addr; 13876ed7257bSPatrick Caulfield int i; 13886ed7257bSPatrick Caulfield 138930d3a237SPatrick Caulfield dlm_local_count = 0; 13901b189b88SDavid Teigland for (i = 0; i < DLM_MAX_ADDR_COUNT; i++) { 13916ed7257bSPatrick Caulfield if (dlm_our_addr(&sas, i)) 13926ed7257bSPatrick Caulfield break; 13936ed7257bSPatrick Caulfield 13945c93f56fSAmitoj Kaur Chawla addr = kmemdup(&sas, sizeof(*addr), GFP_NOFS); 13956ed7257bSPatrick Caulfield if (!addr) 13966ed7257bSPatrick Caulfield break; 13976ed7257bSPatrick Caulfield dlm_local_addr[dlm_local_count++] = addr; 13986ed7257bSPatrick Caulfield } 13996ed7257bSPatrick Caulfield } 14006ed7257bSPatrick Caulfield 1401043697f0SAlexander Aring static void deinit_local(void) 1402043697f0SAlexander Aring { 1403043697f0SAlexander Aring int i; 1404043697f0SAlexander Aring 1405043697f0SAlexander Aring for (i = 0; i < dlm_local_count; i++) 1406043697f0SAlexander Aring kfree(dlm_local_addr[i]); 1407043697f0SAlexander Aring } 1408043697f0SAlexander Aring 1409d11ccd45SAlexander Aring /* Initialise SCTP socket and bind to all interfaces 1410d11ccd45SAlexander Aring * On error caller must run dlm_close_sock() for the 1411d11ccd45SAlexander Aring * listen connection socket. 1412d11ccd45SAlexander Aring */ 1413d11ccd45SAlexander Aring static int sctp_listen_for_all(struct listen_connection *con) 14146ed7257bSPatrick Caulfield { 14156ed7257bSPatrick Caulfield struct socket *sock = NULL; 1416ee44b4bcSMarcelo Ricardo Leitner int result = -EINVAL; 14176ed7257bSPatrick Caulfield 14186ed7257bSPatrick Caulfield log_print("Using SCTP for communications"); 14196ed7257bSPatrick Caulfield 1420eeb1bd5cSEric W. Biederman result = sock_create_kern(&init_net, dlm_local_addr[0]->ss_family, 1421ee44b4bcSMarcelo Ricardo Leitner SOCK_STREAM, IPPROTO_SCTP, &sock); 14226ed7257bSPatrick Caulfield if (result < 0) { 14236ed7257bSPatrick Caulfield log_print("Can't create comms socket, check SCTP is loaded"); 14246ed7257bSPatrick Caulfield goto out; 14256ed7257bSPatrick Caulfield } 14266ed7257bSPatrick Caulfield 142726cfabf9SChristoph Hellwig sock_set_rcvbuf(sock->sk, NEEDED_RMEM); 1428a5b7ab63SAlexander Aring sock_set_mark(sock->sk, dlm_config.ci_mark); 142940ef92c6SChristoph Hellwig sctp_sock_set_nodelay(sock->sk); 143086e92ad2SMike Christie 1431d11ccd45SAlexander Aring add_listen_sock(sock, con); 1432b81171cbSBob Peterson 1433ee44b4bcSMarcelo Ricardo Leitner /* Bind to all addresses. */ 1434d11ccd45SAlexander Aring result = sctp_bind_addrs(con->sock, dlm_config.ci_tcp_port); 1435d11ccd45SAlexander Aring if (result < 0) 1436d11ccd45SAlexander Aring goto out; 14376ed7257bSPatrick Caulfield 14386ed7257bSPatrick Caulfield result = sock->ops->listen(sock, 5); 14396ed7257bSPatrick Caulfield if (result < 0) { 14406ed7257bSPatrick Caulfield log_print("Can't set socket listening"); 1441d11ccd45SAlexander Aring goto out; 14426ed7257bSPatrick Caulfield } 14436ed7257bSPatrick Caulfield 14446ed7257bSPatrick Caulfield return 0; 14456ed7257bSPatrick Caulfield 14466ed7257bSPatrick Caulfield out: 14476ed7257bSPatrick Caulfield return result; 14486ed7257bSPatrick Caulfield } 14496ed7257bSPatrick Caulfield 14506ed7257bSPatrick Caulfield static int tcp_listen_for_all(void) 14516ed7257bSPatrick Caulfield { 14526ed7257bSPatrick Caulfield /* We don't support multi-homed hosts */ 14531a26bfafSAlexander Aring if (dlm_local_count > 1) { 1454617e82e1SDavid Teigland log_print("TCP protocol can't handle multi-homed hosts, " 1455617e82e1SDavid Teigland "try SCTP"); 14566ed7257bSPatrick Caulfield return -EINVAL; 14576ed7257bSPatrick Caulfield } 14586ed7257bSPatrick Caulfield 14596ed7257bSPatrick Caulfield log_print("Using TCP for communications"); 14606ed7257bSPatrick Caulfield 1461d11ccd45SAlexander Aring return tcp_create_listen_sock(&listen_con, dlm_local_addr[0]); 14626ed7257bSPatrick Caulfield } 14636ed7257bSPatrick Caulfield 14646ed7257bSPatrick Caulfield 14656ed7257bSPatrick Caulfield 14666ed7257bSPatrick Caulfield static struct writequeue_entry *new_writequeue_entry(struct connection *con, 14676ed7257bSPatrick Caulfield gfp_t allocation) 14686ed7257bSPatrick Caulfield { 14696ed7257bSPatrick Caulfield struct writequeue_entry *entry; 14706ed7257bSPatrick Caulfield 1471f0747ebfSAlexander Aring entry = kzalloc(sizeof(*entry), allocation); 14726ed7257bSPatrick Caulfield if (!entry) 14736ed7257bSPatrick Caulfield return NULL; 14746ed7257bSPatrick Caulfield 1475e1a7cbceSAlexander Aring entry->page = alloc_page(allocation | __GFP_ZERO); 14766ed7257bSPatrick Caulfield if (!entry->page) { 14776ed7257bSPatrick Caulfield kfree(entry); 14786ed7257bSPatrick Caulfield return NULL; 14796ed7257bSPatrick Caulfield } 14806ed7257bSPatrick Caulfield 14816ed7257bSPatrick Caulfield entry->con = con; 1482f0747ebfSAlexander Aring entry->users = 1; 14838f2dc78dSAlexander Aring kref_init(&entry->ref); 14848f2dc78dSAlexander Aring INIT_LIST_HEAD(&entry->msgs); 14856ed7257bSPatrick Caulfield 14866ed7257bSPatrick Caulfield return entry; 14876ed7257bSPatrick Caulfield } 14886ed7257bSPatrick Caulfield 1489f0747ebfSAlexander Aring static struct writequeue_entry *new_wq_entry(struct connection *con, int len, 14908f2dc78dSAlexander Aring gfp_t allocation, char **ppc, 14918f2dc78dSAlexander Aring void (*cb)(struct dlm_mhandle *mh), 14928f2dc78dSAlexander Aring struct dlm_mhandle *mh) 1493f0747ebfSAlexander Aring { 1494f0747ebfSAlexander Aring struct writequeue_entry *e; 1495f0747ebfSAlexander Aring 1496f0747ebfSAlexander Aring spin_lock(&con->writequeue_lock); 1497f0747ebfSAlexander Aring if (!list_empty(&con->writequeue)) { 1498f0747ebfSAlexander Aring e = list_last_entry(&con->writequeue, struct writequeue_entry, list); 1499f0747ebfSAlexander Aring if (DLM_WQ_REMAIN_BYTES(e) >= len) { 15008f2dc78dSAlexander Aring kref_get(&e->ref); 15018f2dc78dSAlexander Aring 1502f0747ebfSAlexander Aring *ppc = page_address(e->page) + e->end; 15038f2dc78dSAlexander Aring if (cb) 15048f2dc78dSAlexander Aring cb(mh); 15058f2dc78dSAlexander Aring 1506f0747ebfSAlexander Aring e->end += len; 1507f0747ebfSAlexander Aring e->users++; 1508f0747ebfSAlexander Aring spin_unlock(&con->writequeue_lock); 1509f0747ebfSAlexander Aring 1510f0747ebfSAlexander Aring return e; 1511f0747ebfSAlexander Aring } 1512f0747ebfSAlexander Aring } 1513f0747ebfSAlexander Aring spin_unlock(&con->writequeue_lock); 1514f0747ebfSAlexander Aring 1515f0747ebfSAlexander Aring e = new_writequeue_entry(con, allocation); 1516f0747ebfSAlexander Aring if (!e) 1517f0747ebfSAlexander Aring return NULL; 1518f0747ebfSAlexander Aring 15198f2dc78dSAlexander Aring kref_get(&e->ref); 1520f0747ebfSAlexander Aring *ppc = page_address(e->page); 1521f0747ebfSAlexander Aring e->end += len; 15228aa31cbfSAlexander Aring atomic_inc(&con->writequeue_cnt); 1523f0747ebfSAlexander Aring 1524f0747ebfSAlexander Aring spin_lock(&con->writequeue_lock); 15258f2dc78dSAlexander Aring if (cb) 15268f2dc78dSAlexander Aring cb(mh); 15278f2dc78dSAlexander Aring 1528f0747ebfSAlexander Aring list_add_tail(&e->list, &con->writequeue); 1529f0747ebfSAlexander Aring spin_unlock(&con->writequeue_lock); 1530f0747ebfSAlexander Aring 1531f0747ebfSAlexander Aring return e; 1532f0747ebfSAlexander Aring }; 1533f0747ebfSAlexander Aring 15342874d1a6SAlexander Aring static struct dlm_msg *dlm_lowcomms_new_msg_con(struct connection *con, int len, 15352874d1a6SAlexander Aring gfp_t allocation, char **ppc, 15362874d1a6SAlexander Aring void (*cb)(struct dlm_mhandle *mh), 15372874d1a6SAlexander Aring struct dlm_mhandle *mh) 15382874d1a6SAlexander Aring { 15392874d1a6SAlexander Aring struct writequeue_entry *e; 15402874d1a6SAlexander Aring struct dlm_msg *msg; 15412874d1a6SAlexander Aring 15422874d1a6SAlexander Aring msg = kzalloc(sizeof(*msg), allocation); 15432874d1a6SAlexander Aring if (!msg) 15442874d1a6SAlexander Aring return NULL; 15452874d1a6SAlexander Aring 15462874d1a6SAlexander Aring kref_init(&msg->ref); 15472874d1a6SAlexander Aring 15482874d1a6SAlexander Aring e = new_wq_entry(con, len, allocation, ppc, cb, mh); 15492874d1a6SAlexander Aring if (!e) { 15502874d1a6SAlexander Aring kfree(msg); 15512874d1a6SAlexander Aring return NULL; 15522874d1a6SAlexander Aring } 15532874d1a6SAlexander Aring 15542874d1a6SAlexander Aring msg->ppc = *ppc; 15552874d1a6SAlexander Aring msg->len = len; 15562874d1a6SAlexander Aring msg->entry = e; 15572874d1a6SAlexander Aring 15582874d1a6SAlexander Aring return msg; 15592874d1a6SAlexander Aring } 15602874d1a6SAlexander Aring 15618f2dc78dSAlexander Aring struct dlm_msg *dlm_lowcomms_new_msg(int nodeid, int len, gfp_t allocation, 15628f2dc78dSAlexander Aring char **ppc, void (*cb)(struct dlm_mhandle *mh), 15638f2dc78dSAlexander Aring struct dlm_mhandle *mh) 15646ed7257bSPatrick Caulfield { 15656ed7257bSPatrick Caulfield struct connection *con; 15668f2dc78dSAlexander Aring struct dlm_msg *msg; 1567b38bc9c2SAlexander Aring int idx; 15686ed7257bSPatrick Caulfield 1569d10a0b88SAlexander Aring if (len > DLM_MAX_SOCKET_BUFSIZE || 1570c45674fbSAlexander Aring len < sizeof(struct dlm_header)) { 1571d10a0b88SAlexander Aring BUILD_BUG_ON(PAGE_SIZE < DLM_MAX_SOCKET_BUFSIZE); 1572692f51c8SAlexander Aring log_print("failed to allocate a buffer of size %d", len); 1573c45674fbSAlexander Aring WARN_ON(1); 1574692f51c8SAlexander Aring return NULL; 1575692f51c8SAlexander Aring } 1576692f51c8SAlexander Aring 1577b38bc9c2SAlexander Aring idx = srcu_read_lock(&connections_srcu); 15786ed7257bSPatrick Caulfield con = nodeid2con(nodeid, allocation); 1579b38bc9c2SAlexander Aring if (!con) { 1580b38bc9c2SAlexander Aring srcu_read_unlock(&connections_srcu, idx); 15816ed7257bSPatrick Caulfield return NULL; 1582b38bc9c2SAlexander Aring } 15836ed7257bSPatrick Caulfield 15842874d1a6SAlexander Aring msg = dlm_lowcomms_new_msg_con(con, len, allocation, ppc, cb, mh); 15858f2dc78dSAlexander Aring if (!msg) { 1586b38bc9c2SAlexander Aring srcu_read_unlock(&connections_srcu, idx); 1587b38bc9c2SAlexander Aring return NULL; 1588b38bc9c2SAlexander Aring } 1589b38bc9c2SAlexander Aring 15908f2dc78dSAlexander Aring /* we assume if successful commit must called */ 15918f2dc78dSAlexander Aring msg->idx = idx; 15928f2dc78dSAlexander Aring return msg; 15938f2dc78dSAlexander Aring } 15948f2dc78dSAlexander Aring 15952874d1a6SAlexander Aring static void _dlm_lowcomms_commit_msg(struct dlm_msg *msg) 15966ed7257bSPatrick Caulfield { 15978f2dc78dSAlexander Aring struct writequeue_entry *e = msg->entry; 15986ed7257bSPatrick Caulfield struct connection *con = e->con; 15996ed7257bSPatrick Caulfield int users; 16006ed7257bSPatrick Caulfield 16016ed7257bSPatrick Caulfield spin_lock(&con->writequeue_lock); 16028f2dc78dSAlexander Aring kref_get(&msg->ref); 16038f2dc78dSAlexander Aring list_add(&msg->list, &e->msgs); 16048f2dc78dSAlexander Aring 16056ed7257bSPatrick Caulfield users = --e->users; 16066ed7257bSPatrick Caulfield if (users) 16076ed7257bSPatrick Caulfield goto out; 1608f0747ebfSAlexander Aring 1609f0747ebfSAlexander Aring e->len = DLM_WQ_LENGTH_BYTES(e); 16106ed7257bSPatrick Caulfield spin_unlock(&con->writequeue_lock); 16116ed7257bSPatrick Caulfield 16126ed7257bSPatrick Caulfield queue_work(send_workqueue, &con->swork); 16136ed7257bSPatrick Caulfield return; 16146ed7257bSPatrick Caulfield 16156ed7257bSPatrick Caulfield out: 16166ed7257bSPatrick Caulfield spin_unlock(&con->writequeue_lock); 16176ed7257bSPatrick Caulfield return; 16186ed7257bSPatrick Caulfield } 16196ed7257bSPatrick Caulfield 16202874d1a6SAlexander Aring void dlm_lowcomms_commit_msg(struct dlm_msg *msg) 16212874d1a6SAlexander Aring { 16222874d1a6SAlexander Aring _dlm_lowcomms_commit_msg(msg); 16232874d1a6SAlexander Aring srcu_read_unlock(&connections_srcu, msg->idx); 16242874d1a6SAlexander Aring } 16252874d1a6SAlexander Aring 16268f2dc78dSAlexander Aring void dlm_lowcomms_put_msg(struct dlm_msg *msg) 16278f2dc78dSAlexander Aring { 16288f2dc78dSAlexander Aring kref_put(&msg->ref, dlm_msg_release); 16298f2dc78dSAlexander Aring } 16308f2dc78dSAlexander Aring 16312874d1a6SAlexander Aring /* does not held connections_srcu, usage workqueue only */ 16322874d1a6SAlexander Aring int dlm_lowcomms_resend_msg(struct dlm_msg *msg) 16332874d1a6SAlexander Aring { 16342874d1a6SAlexander Aring struct dlm_msg *msg_resend; 16352874d1a6SAlexander Aring char *ppc; 16362874d1a6SAlexander Aring 16372874d1a6SAlexander Aring if (msg->retransmit) 16382874d1a6SAlexander Aring return 1; 16392874d1a6SAlexander Aring 16402874d1a6SAlexander Aring msg_resend = dlm_lowcomms_new_msg_con(msg->entry->con, msg->len, 16412874d1a6SAlexander Aring GFP_ATOMIC, &ppc, NULL, NULL); 16422874d1a6SAlexander Aring if (!msg_resend) 16432874d1a6SAlexander Aring return -ENOMEM; 16442874d1a6SAlexander Aring 16452874d1a6SAlexander Aring msg->retransmit = true; 16462874d1a6SAlexander Aring kref_get(&msg->ref); 16472874d1a6SAlexander Aring msg_resend->orig_msg = msg; 16482874d1a6SAlexander Aring 16492874d1a6SAlexander Aring memcpy(ppc, msg->ppc, msg->len); 16502874d1a6SAlexander Aring _dlm_lowcomms_commit_msg(msg_resend); 16512874d1a6SAlexander Aring dlm_lowcomms_put_msg(msg_resend); 16522874d1a6SAlexander Aring 16532874d1a6SAlexander Aring return 0; 16542874d1a6SAlexander Aring } 16552874d1a6SAlexander Aring 16566ed7257bSPatrick Caulfield /* Send a message */ 16576ed7257bSPatrick Caulfield static void send_to_sock(struct connection *con) 16586ed7257bSPatrick Caulfield { 16596ed7257bSPatrick Caulfield const int msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL; 16606ed7257bSPatrick Caulfield struct writequeue_entry *e; 166166d5955aSAlexander Aring int len, offset, ret; 1662f92c8dd7SBob Peterson int count = 0; 16636ed7257bSPatrick Caulfield 16646ed7257bSPatrick Caulfield mutex_lock(&con->sock_mutex); 16656ed7257bSPatrick Caulfield if (con->sock == NULL) 16666ed7257bSPatrick Caulfield goto out_connect; 16676ed7257bSPatrick Caulfield 16686ed7257bSPatrick Caulfield spin_lock(&con->writequeue_lock); 16696ed7257bSPatrick Caulfield for (;;) { 167066d5955aSAlexander Aring e = con_next_wq(con); 167166d5955aSAlexander Aring if (!e) 16726ed7257bSPatrick Caulfield break; 16736ed7257bSPatrick Caulfield 1674f0747ebfSAlexander Aring e = list_first_entry(&con->writequeue, struct writequeue_entry, list); 16756ed7257bSPatrick Caulfield len = e->len; 16766ed7257bSPatrick Caulfield offset = e->offset; 16776ed7257bSPatrick Caulfield BUG_ON(len == 0 && e->users == 0); 16786ed7257bSPatrick Caulfield spin_unlock(&con->writequeue_lock); 16796ed7257bSPatrick Caulfield 16801329e3f2SPaolo Bonzini ret = kernel_sendpage(con->sock, e->page, offset, len, 16816ed7257bSPatrick Caulfield msg_flags); 1682d66f8277SPatrick Caulfield if (ret == -EAGAIN || ret == 0) { 1683b36930ddSDavid Miller if (ret == -EAGAIN && 16849cd3e072SEric Dumazet test_bit(SOCKWQ_ASYNC_NOSPACE, &con->sock->flags) && 1685b36930ddSDavid Miller !test_and_set_bit(CF_APP_LIMITED, &con->flags)) { 1686b36930ddSDavid Miller /* Notify TCP that we're limited by the 1687b36930ddSDavid Miller * application window size. 1688b36930ddSDavid Miller */ 1689b36930ddSDavid Miller set_bit(SOCK_NOSPACE, &con->sock->flags); 1690b36930ddSDavid Miller con->sock->sk->sk_write_pending++; 1691b36930ddSDavid Miller } 1692d66f8277SPatrick Caulfield cond_resched(); 16936ed7257bSPatrick Caulfield goto out; 16949c5bef58SYing Xue } else if (ret < 0) 1695ba868d9dSAlexander Aring goto out; 1696f92c8dd7SBob Peterson 16976ed7257bSPatrick Caulfield /* Don't starve people filling buffers */ 1698f92c8dd7SBob Peterson if (++count >= MAX_SEND_MSG_COUNT) { 16996ed7257bSPatrick Caulfield cond_resched(); 1700f92c8dd7SBob Peterson count = 0; 1701f92c8dd7SBob Peterson } 17026ed7257bSPatrick Caulfield 17036ed7257bSPatrick Caulfield spin_lock(&con->writequeue_lock); 17045d689871SMike Christie writequeue_entry_complete(e, ret); 17056ed7257bSPatrick Caulfield } 17066ed7257bSPatrick Caulfield spin_unlock(&con->writequeue_lock); 17078aa31cbfSAlexander Aring 17088aa31cbfSAlexander Aring /* close if we got EOF */ 17098aa31cbfSAlexander Aring if (test_and_clear_bit(CF_EOF, &con->flags)) { 17108aa31cbfSAlexander Aring mutex_unlock(&con->sock_mutex); 17118aa31cbfSAlexander Aring close_connection(con, false, false, true); 17128aa31cbfSAlexander Aring 17138aa31cbfSAlexander Aring /* handling for tcp shutdown */ 17148aa31cbfSAlexander Aring clear_bit(CF_SHUTDOWN, &con->flags); 17158aa31cbfSAlexander Aring wake_up(&con->shutdown_wait); 17168aa31cbfSAlexander Aring } else { 17178aa31cbfSAlexander Aring mutex_unlock(&con->sock_mutex); 17188aa31cbfSAlexander Aring } 17198aa31cbfSAlexander Aring 17208aa31cbfSAlexander Aring return; 17218aa31cbfSAlexander Aring 17226ed7257bSPatrick Caulfield out: 17236ed7257bSPatrick Caulfield mutex_unlock(&con->sock_mutex); 17246ed7257bSPatrick Caulfield return; 17256ed7257bSPatrick Caulfield 17266ed7257bSPatrick Caulfield out_connect: 17276ed7257bSPatrick Caulfield mutex_unlock(&con->sock_mutex); 172801da24d3SBob Peterson queue_work(send_workqueue, &con->swork); 172901da24d3SBob Peterson cond_resched(); 17306ed7257bSPatrick Caulfield } 17316ed7257bSPatrick Caulfield 17326ed7257bSPatrick Caulfield static void clean_one_writequeue(struct connection *con) 17336ed7257bSPatrick Caulfield { 17345e9ccc37SChristine Caulfield struct writequeue_entry *e, *safe; 17356ed7257bSPatrick Caulfield 17366ed7257bSPatrick Caulfield spin_lock(&con->writequeue_lock); 17375e9ccc37SChristine Caulfield list_for_each_entry_safe(e, safe, &con->writequeue, list) { 17386ed7257bSPatrick Caulfield free_entry(e); 17396ed7257bSPatrick Caulfield } 17406ed7257bSPatrick Caulfield spin_unlock(&con->writequeue_lock); 17416ed7257bSPatrick Caulfield } 17426ed7257bSPatrick Caulfield 17436ed7257bSPatrick Caulfield /* Called from recovery when it knows that a node has 17446ed7257bSPatrick Caulfield left the cluster */ 17456ed7257bSPatrick Caulfield int dlm_lowcomms_close(int nodeid) 17466ed7257bSPatrick Caulfield { 17476ed7257bSPatrick Caulfield struct connection *con; 174836b71a8bSDavid Teigland struct dlm_node_addr *na; 1749b38bc9c2SAlexander Aring int idx; 17506ed7257bSPatrick Caulfield 17516ed7257bSPatrick Caulfield log_print("closing connection to node %d", nodeid); 1752b38bc9c2SAlexander Aring idx = srcu_read_lock(&connections_srcu); 17536ed7257bSPatrick Caulfield con = nodeid2con(nodeid, 0); 17546ed7257bSPatrick Caulfield if (con) { 1755063c4c99SLars Marowsky-Bree set_bit(CF_CLOSE, &con->flags); 17560d737a8cSMarcelo Ricardo Leitner close_connection(con, true, true, true); 17576ed7257bSPatrick Caulfield clean_one_writequeue(con); 175853a5edaaSAlexander Aring if (con->othercon) 175953a5edaaSAlexander Aring clean_one_writequeue(con->othercon); 17606ed7257bSPatrick Caulfield } 1761b38bc9c2SAlexander Aring srcu_read_unlock(&connections_srcu, idx); 176236b71a8bSDavid Teigland 176336b71a8bSDavid Teigland spin_lock(&dlm_node_addrs_spin); 176436b71a8bSDavid Teigland na = find_node_addr(nodeid); 176536b71a8bSDavid Teigland if (na) { 176636b71a8bSDavid Teigland list_del(&na->list); 176736b71a8bSDavid Teigland while (na->addr_count--) 176836b71a8bSDavid Teigland kfree(na->addr[na->addr_count]); 176936b71a8bSDavid Teigland kfree(na); 177036b71a8bSDavid Teigland } 177136b71a8bSDavid Teigland spin_unlock(&dlm_node_addrs_spin); 177236b71a8bSDavid Teigland 17736ed7257bSPatrick Caulfield return 0; 17746ed7257bSPatrick Caulfield } 17756ed7257bSPatrick Caulfield 17766ed7257bSPatrick Caulfield /* Receive workqueue function */ 17776ed7257bSPatrick Caulfield static void process_recv_sockets(struct work_struct *work) 17786ed7257bSPatrick Caulfield { 17796ed7257bSPatrick Caulfield struct connection *con = container_of(work, struct connection, rwork); 17806ed7257bSPatrick Caulfield int err; 17816ed7257bSPatrick Caulfield 17826ed7257bSPatrick Caulfield clear_bit(CF_READ_PENDING, &con->flags); 17836ed7257bSPatrick Caulfield do { 1784d11ccd45SAlexander Aring err = receive_from_sock(con); 17856ed7257bSPatrick Caulfield } while (!err); 17866ed7257bSPatrick Caulfield } 17876ed7257bSPatrick Caulfield 1788d11ccd45SAlexander Aring static void process_listen_recv_socket(struct work_struct *work) 1789d11ccd45SAlexander Aring { 1790d11ccd45SAlexander Aring accept_from_sock(&listen_con); 1791d11ccd45SAlexander Aring } 1792d11ccd45SAlexander Aring 17936ed7257bSPatrick Caulfield /* Send workqueue function */ 17946ed7257bSPatrick Caulfield static void process_send_sockets(struct work_struct *work) 17956ed7257bSPatrick Caulfield { 17966ed7257bSPatrick Caulfield struct connection *con = container_of(work, struct connection, swork); 17976ed7257bSPatrick Caulfield 17987443bc96SAlexander Aring WARN_ON(test_bit(CF_IS_OTHERCON, &con->flags)); 17997443bc96SAlexander Aring 18008a4abb08Stsutomu.owa@toshiba.co.jp clear_bit(CF_WRITE_PENDING, &con->flags); 1801ba868d9dSAlexander Aring 1802489d8e55SAlexander Aring if (test_and_clear_bit(CF_RECONNECT, &con->flags)) { 1803ba868d9dSAlexander Aring close_connection(con, false, false, true); 1804489d8e55SAlexander Aring dlm_midcomms_unack_msg_resend(con->nodeid); 1805489d8e55SAlexander Aring } 1806ba868d9dSAlexander Aring 1807ba868d9dSAlexander Aring if (con->sock == NULL) { /* not mutex protected so check it inside too */ 1808ba868d9dSAlexander Aring if (test_and_clear_bit(CF_DELAY_CONNECT, &con->flags)) 1809ba868d9dSAlexander Aring msleep(1000); 1810*a66c008cSAlexander Aring dlm_proto_ops->connect_action(con); 1811ba868d9dSAlexander Aring } 181201da24d3SBob Peterson if (!list_empty(&con->writequeue)) 18136ed7257bSPatrick Caulfield send_to_sock(con); 18146ed7257bSPatrick Caulfield } 18156ed7257bSPatrick Caulfield 18166ed7257bSPatrick Caulfield static void work_stop(void) 18176ed7257bSPatrick Caulfield { 1818fcef0e6cSAlexander Aring if (recv_workqueue) { 18196ed7257bSPatrick Caulfield destroy_workqueue(recv_workqueue); 1820fcef0e6cSAlexander Aring recv_workqueue = NULL; 1821fcef0e6cSAlexander Aring } 1822fcef0e6cSAlexander Aring 1823fcef0e6cSAlexander Aring if (send_workqueue) { 18246ed7257bSPatrick Caulfield destroy_workqueue(send_workqueue); 1825fcef0e6cSAlexander Aring send_workqueue = NULL; 1826fcef0e6cSAlexander Aring } 18276ed7257bSPatrick Caulfield } 18286ed7257bSPatrick Caulfield 18296ed7257bSPatrick Caulfield static int work_start(void) 18306ed7257bSPatrick Caulfield { 18316c6a1cc6SAlexander Aring recv_workqueue = alloc_ordered_workqueue("dlm_recv", WQ_MEM_RECLAIM); 1832b9d41052SNamhyung Kim if (!recv_workqueue) { 1833b9d41052SNamhyung Kim log_print("can't start dlm_recv"); 1834b9d41052SNamhyung Kim return -ENOMEM; 18356ed7257bSPatrick Caulfield } 18366ed7257bSPatrick Caulfield 18376c6a1cc6SAlexander Aring send_workqueue = alloc_ordered_workqueue("dlm_send", WQ_MEM_RECLAIM); 1838b9d41052SNamhyung Kim if (!send_workqueue) { 1839b9d41052SNamhyung Kim log_print("can't start dlm_send"); 18406ed7257bSPatrick Caulfield destroy_workqueue(recv_workqueue); 1841fcef0e6cSAlexander Aring recv_workqueue = NULL; 1842b9d41052SNamhyung Kim return -ENOMEM; 18436ed7257bSPatrick Caulfield } 18446ed7257bSPatrick Caulfield 18456ed7257bSPatrick Caulfield return 0; 18466ed7257bSPatrick Caulfield } 18476ed7257bSPatrick Caulfield 18489d232469SAlexander Aring static void shutdown_conn(struct connection *con) 18499d232469SAlexander Aring { 1850*a66c008cSAlexander Aring if (dlm_proto_ops->shutdown_action) 1851*a66c008cSAlexander Aring dlm_proto_ops->shutdown_action(con); 18529d232469SAlexander Aring } 18539d232469SAlexander Aring 18549d232469SAlexander Aring void dlm_lowcomms_shutdown(void) 18559d232469SAlexander Aring { 1856b38bc9c2SAlexander Aring int idx; 1857b38bc9c2SAlexander Aring 18589d232469SAlexander Aring /* Set all the flags to prevent any 18599d232469SAlexander Aring * socket activity. 18609d232469SAlexander Aring */ 18619d232469SAlexander Aring dlm_allow_conn = 0; 18629d232469SAlexander Aring 18639d232469SAlexander Aring if (recv_workqueue) 18649d232469SAlexander Aring flush_workqueue(recv_workqueue); 18659d232469SAlexander Aring if (send_workqueue) 18669d232469SAlexander Aring flush_workqueue(send_workqueue); 18679d232469SAlexander Aring 18689d232469SAlexander Aring dlm_close_sock(&listen_con.sock); 18699d232469SAlexander Aring 1870b38bc9c2SAlexander Aring idx = srcu_read_lock(&connections_srcu); 18719d232469SAlexander Aring foreach_conn(shutdown_conn); 1872b38bc9c2SAlexander Aring srcu_read_unlock(&connections_srcu, idx); 18739d232469SAlexander Aring } 18749d232469SAlexander Aring 1875f0fb83cbStsutomu.owa@toshiba.co.jp static void _stop_conn(struct connection *con, bool and_other) 18766ed7257bSPatrick Caulfield { 1877f0fb83cbStsutomu.owa@toshiba.co.jp mutex_lock(&con->sock_mutex); 1878173a31feStsutomu.owa@toshiba.co.jp set_bit(CF_CLOSE, &con->flags); 1879f0fb83cbStsutomu.owa@toshiba.co.jp set_bit(CF_READ_PENDING, &con->flags); 18808a4abb08Stsutomu.owa@toshiba.co.jp set_bit(CF_WRITE_PENDING, &con->flags); 188193eaadebStsutomu.owa@toshiba.co.jp if (con->sock && con->sock->sk) { 188293eaadebStsutomu.owa@toshiba.co.jp write_lock_bh(&con->sock->sk->sk_callback_lock); 1883afb853fbSPatrick Caulfield con->sock->sk->sk_user_data = NULL; 188493eaadebStsutomu.owa@toshiba.co.jp write_unlock_bh(&con->sock->sk->sk_callback_lock); 188593eaadebStsutomu.owa@toshiba.co.jp } 1886f0fb83cbStsutomu.owa@toshiba.co.jp if (con->othercon && and_other) 1887f0fb83cbStsutomu.owa@toshiba.co.jp _stop_conn(con->othercon, false); 1888f0fb83cbStsutomu.owa@toshiba.co.jp mutex_unlock(&con->sock_mutex); 1889f0fb83cbStsutomu.owa@toshiba.co.jp } 1890f0fb83cbStsutomu.owa@toshiba.co.jp 1891f0fb83cbStsutomu.owa@toshiba.co.jp static void stop_conn(struct connection *con) 1892f0fb83cbStsutomu.owa@toshiba.co.jp { 1893f0fb83cbStsutomu.owa@toshiba.co.jp _stop_conn(con, true); 1894afb853fbSPatrick Caulfield } 18955e9ccc37SChristine Caulfield 18964798cbbfSAlexander Aring static void connection_release(struct rcu_head *rcu) 18974798cbbfSAlexander Aring { 18984798cbbfSAlexander Aring struct connection *con = container_of(rcu, struct connection, rcu); 18994798cbbfSAlexander Aring 19004798cbbfSAlexander Aring kfree(con->rx_buf); 19014798cbbfSAlexander Aring kfree(con); 19024798cbbfSAlexander Aring } 19034798cbbfSAlexander Aring 19045e9ccc37SChristine Caulfield static void free_conn(struct connection *con) 19055e9ccc37SChristine Caulfield { 19060d737a8cSMarcelo Ricardo Leitner close_connection(con, true, true, true); 1907a47666ebSAlexander Aring spin_lock(&connections_lock); 1908a47666ebSAlexander Aring hlist_del_rcu(&con->list); 1909a47666ebSAlexander Aring spin_unlock(&connections_lock); 1910948c47e9SAlexander Aring if (con->othercon) { 1911948c47e9SAlexander Aring clean_one_writequeue(con->othercon); 19125cbec208SAlexander Aring call_srcu(&connections_srcu, &con->othercon->rcu, 19135cbec208SAlexander Aring connection_release); 1914948c47e9SAlexander Aring } 19150de98432SAlexander Aring clean_one_writequeue(con); 19165cbec208SAlexander Aring call_srcu(&connections_srcu, &con->rcu, connection_release); 19176ed7257bSPatrick Caulfield } 19185e9ccc37SChristine Caulfield 1919f0fb83cbStsutomu.owa@toshiba.co.jp static void work_flush(void) 1920f0fb83cbStsutomu.owa@toshiba.co.jp { 1921b38bc9c2SAlexander Aring int ok; 1922f0fb83cbStsutomu.owa@toshiba.co.jp int i; 1923f0fb83cbStsutomu.owa@toshiba.co.jp struct connection *con; 1924f0fb83cbStsutomu.owa@toshiba.co.jp 1925f0fb83cbStsutomu.owa@toshiba.co.jp do { 1926f0fb83cbStsutomu.owa@toshiba.co.jp ok = 1; 1927f0fb83cbStsutomu.owa@toshiba.co.jp foreach_conn(stop_conn); 1928b355516fSDavid Windsor if (recv_workqueue) 1929f0fb83cbStsutomu.owa@toshiba.co.jp flush_workqueue(recv_workqueue); 1930b355516fSDavid Windsor if (send_workqueue) 1931f0fb83cbStsutomu.owa@toshiba.co.jp flush_workqueue(send_workqueue); 1932f0fb83cbStsutomu.owa@toshiba.co.jp for (i = 0; i < CONN_HASH_SIZE && ok; i++) { 1933a47666ebSAlexander Aring hlist_for_each_entry_rcu(con, &connection_hash[i], 1934a47666ebSAlexander Aring list) { 1935f0fb83cbStsutomu.owa@toshiba.co.jp ok &= test_bit(CF_READ_PENDING, &con->flags); 19368a4abb08Stsutomu.owa@toshiba.co.jp ok &= test_bit(CF_WRITE_PENDING, &con->flags); 19378a4abb08Stsutomu.owa@toshiba.co.jp if (con->othercon) { 1938f0fb83cbStsutomu.owa@toshiba.co.jp ok &= test_bit(CF_READ_PENDING, 1939f0fb83cbStsutomu.owa@toshiba.co.jp &con->othercon->flags); 19408a4abb08Stsutomu.owa@toshiba.co.jp ok &= test_bit(CF_WRITE_PENDING, 19418a4abb08Stsutomu.owa@toshiba.co.jp &con->othercon->flags); 19428a4abb08Stsutomu.owa@toshiba.co.jp } 1943f0fb83cbStsutomu.owa@toshiba.co.jp } 1944f0fb83cbStsutomu.owa@toshiba.co.jp } 1945f0fb83cbStsutomu.owa@toshiba.co.jp } while (!ok); 1946f0fb83cbStsutomu.owa@toshiba.co.jp } 1947f0fb83cbStsutomu.owa@toshiba.co.jp 19485e9ccc37SChristine Caulfield void dlm_lowcomms_stop(void) 19495e9ccc37SChristine Caulfield { 1950b38bc9c2SAlexander Aring int idx; 1951b38bc9c2SAlexander Aring 1952b38bc9c2SAlexander Aring idx = srcu_read_lock(&connections_srcu); 1953f0fb83cbStsutomu.owa@toshiba.co.jp work_flush(); 19543a8db798SMarcelo Ricardo Leitner foreach_conn(free_conn); 1955b38bc9c2SAlexander Aring srcu_read_unlock(&connections_srcu, idx); 19566ed7257bSPatrick Caulfield work_stop(); 1957043697f0SAlexander Aring deinit_local(); 1958*a66c008cSAlexander Aring 1959*a66c008cSAlexander Aring dlm_proto_ops = NULL; 19606ed7257bSPatrick Caulfield } 19616ed7257bSPatrick Caulfield 1962*a66c008cSAlexander Aring static const struct dlm_proto_ops dlm_tcp_ops = { 1963*a66c008cSAlexander Aring .connect_action = tcp_connect_to_sock, 1964*a66c008cSAlexander Aring .shutdown_action = dlm_tcp_shutdown, 1965*a66c008cSAlexander Aring .eof_condition = tcp_eof_condition, 1966*a66c008cSAlexander Aring }; 1967*a66c008cSAlexander Aring 1968*a66c008cSAlexander Aring static const struct dlm_proto_ops dlm_sctp_ops = { 1969*a66c008cSAlexander Aring .connect_action = sctp_connect_to_sock, 1970*a66c008cSAlexander Aring }; 1971*a66c008cSAlexander Aring 19726ed7257bSPatrick Caulfield int dlm_lowcomms_start(void) 19736ed7257bSPatrick Caulfield { 19746ed7257bSPatrick Caulfield int error = -EINVAL; 19755e9ccc37SChristine Caulfield int i; 19765e9ccc37SChristine Caulfield 19775e9ccc37SChristine Caulfield for (i = 0; i < CONN_HASH_SIZE; i++) 19785e9ccc37SChristine Caulfield INIT_HLIST_HEAD(&connection_hash[i]); 19796ed7257bSPatrick Caulfield 19806ed7257bSPatrick Caulfield init_local(); 19816ed7257bSPatrick Caulfield if (!dlm_local_count) { 1982617e82e1SDavid Teigland error = -ENOTCONN; 19836ed7257bSPatrick Caulfield log_print("no local IP address has been set"); 1984513ef596SDavid Teigland goto fail; 19856ed7257bSPatrick Caulfield } 19866ed7257bSPatrick Caulfield 1987d11ccd45SAlexander Aring INIT_WORK(&listen_con.rwork, process_listen_recv_socket); 1988d11ccd45SAlexander Aring 1989513ef596SDavid Teigland error = work_start(); 1990513ef596SDavid Teigland if (error) 1991fcef0e6cSAlexander Aring goto fail_local; 1992513ef596SDavid Teigland 1993513ef596SDavid Teigland dlm_allow_conn = 1; 19946ed7257bSPatrick Caulfield 19956ed7257bSPatrick Caulfield /* Start listening */ 1996ac7d5d03SAlexander Aring switch (dlm_config.ci_protocol) { 1997ac7d5d03SAlexander Aring case DLM_PROTO_TCP: 1998*a66c008cSAlexander Aring dlm_proto_ops = &dlm_tcp_ops; 19996ed7257bSPatrick Caulfield error = tcp_listen_for_all(); 2000ac7d5d03SAlexander Aring break; 2001ac7d5d03SAlexander Aring case DLM_PROTO_SCTP: 2002*a66c008cSAlexander Aring dlm_proto_ops = &dlm_sctp_ops; 2003d11ccd45SAlexander Aring error = sctp_listen_for_all(&listen_con); 2004ac7d5d03SAlexander Aring break; 2005ac7d5d03SAlexander Aring default: 2006ac7d5d03SAlexander Aring log_print("Invalid protocol identifier %d set", 2007ac7d5d03SAlexander Aring dlm_config.ci_protocol); 2008ac7d5d03SAlexander Aring error = -EINVAL; 2009ac7d5d03SAlexander Aring break; 2010ac7d5d03SAlexander Aring } 20116ed7257bSPatrick Caulfield if (error) 20126ed7257bSPatrick Caulfield goto fail_unlisten; 20136ed7257bSPatrick Caulfield 20146ed7257bSPatrick Caulfield return 0; 20156ed7257bSPatrick Caulfield 20166ed7257bSPatrick Caulfield fail_unlisten: 2017513ef596SDavid Teigland dlm_allow_conn = 0; 2018d11ccd45SAlexander Aring dlm_close_sock(&listen_con.sock); 2019fcef0e6cSAlexander Aring work_stop(); 2020fcef0e6cSAlexander Aring fail_local: 2021fcef0e6cSAlexander Aring deinit_local(); 2022513ef596SDavid Teigland fail: 20236ed7257bSPatrick Caulfield return error; 20246ed7257bSPatrick Caulfield } 202536b71a8bSDavid Teigland 202636b71a8bSDavid Teigland void dlm_lowcomms_exit(void) 202736b71a8bSDavid Teigland { 202836b71a8bSDavid Teigland struct dlm_node_addr *na, *safe; 202936b71a8bSDavid Teigland 203036b71a8bSDavid Teigland spin_lock(&dlm_node_addrs_spin); 203136b71a8bSDavid Teigland list_for_each_entry_safe(na, safe, &dlm_node_addrs, list) { 203236b71a8bSDavid Teigland list_del(&na->list); 203336b71a8bSDavid Teigland while (na->addr_count--) 203436b71a8bSDavid Teigland kfree(na->addr[na->addr_count]); 203536b71a8bSDavid Teigland kfree(na); 203636b71a8bSDavid Teigland } 203736b71a8bSDavid Teigland spin_unlock(&dlm_node_addrs_spin); 203836b71a8bSDavid Teigland } 2039