Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 1 | /****************************************************************************** |
| 2 | ******************************************************************************* |
| 3 | ** |
| 4 | ** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. |
Christine Caulfield | 5e9ccc3 | 2009-01-28 12:57:40 -0600 | [diff] [blame] | 5 | ** Copyright (C) 2004-2009 Red Hat, Inc. All rights reserved. |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 6 | ** |
| 7 | ** This copyrighted material is made available to anyone wishing to use, |
| 8 | ** modify, copy, or redistribute it subject to the terms and conditions |
| 9 | ** of the GNU General Public License v.2. |
| 10 | ** |
| 11 | ******************************************************************************* |
| 12 | ******************************************************************************/ |
| 13 | |
| 14 | /* |
| 15 | * lowcomms.c |
| 16 | * |
| 17 | * This is the "low-level" comms layer. |
| 18 | * |
| 19 | * It is responsible for sending/receiving messages |
| 20 | * from other nodes in the cluster. |
| 21 | * |
| 22 | * Cluster nodes are referred to by their nodeids. nodeids are |
| 23 | * simply 32 bit numbers to the locking module - if they need to |
Joe Perches | 2cf12c0 | 2009-01-22 13:26:47 -0800 | [diff] [blame] | 24 | * be expanded for the cluster infrastructure then that is its |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 25 | * responsibility. It is this layer's |
| 26 | * responsibility to resolve these into IP address or |
| 27 | * whatever it needs for inter-node communication. |
| 28 | * |
| 29 | * The comms level is two kernel threads that deal mainly with |
| 30 | * the receiving of messages from other nodes and passing them |
| 31 | * up to the mid-level comms layer (which understands the |
| 32 | * message format) for execution by the locking core, and |
| 33 | * a send thread which does all the setting up of connections |
| 34 | * to remote nodes and the sending of data. Threads are not allowed |
| 35 | * to send their own data because it may cause them to wait in times |
| 36 | * of high load. Also, this way, the sending thread can collect together |
| 37 | * messages bound for one node and send them in one block. |
| 38 | * |
Joe Perches | 2cf12c0 | 2009-01-22 13:26:47 -0800 | [diff] [blame] | 39 | * lowcomms will choose to use either TCP or SCTP as its transport layer |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 40 | * depending on the configuration variable 'protocol'. This should be set |
Joe Perches | 2cf12c0 | 2009-01-22 13:26:47 -0800 | [diff] [blame] | 41 | * to 0 (default) for TCP or 1 for SCTP. It should be configured using a |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 42 | * cluster-wide mechanism as it must be the same on all nodes of the cluster |
| 43 | * for the DLM to function. |
| 44 | * |
| 45 | */ |
| 46 | |
| 47 | #include <asm/ioctls.h> |
| 48 | #include <net/sock.h> |
| 49 | #include <net/tcp.h> |
| 50 | #include <linux/pagemap.h> |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 51 | #include <linux/file.h> |
Matthias Kaehlcke | 7a936ce | 2008-05-12 10:04:51 -0500 | [diff] [blame] | 52 | #include <linux/mutex.h> |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 53 | #include <linux/sctp.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 54 | #include <linux/slab.h> |
Benjamin Poirier | 2f2d76c | 2012-03-08 05:55:59 +0000 | [diff] [blame] | 55 | #include <net/sctp/sctp.h> |
Joe Perches | 44ad532 | 2009-01-22 13:24:49 -0800 | [diff] [blame] | 56 | #include <net/ipv6.h> |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 57 | |
| 58 | #include "dlm_internal.h" |
| 59 | #include "lowcomms.h" |
| 60 | #include "midcomms.h" |
| 61 | #include "config.h" |
| 62 | |
| 63 | #define NEEDED_RMEM (4*1024*1024) |
Christine Caulfield | 5e9ccc3 | 2009-01-28 12:57:40 -0600 | [diff] [blame] | 64 | #define CONN_HASH_SIZE 32 |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 65 | |
Bob Peterson | f92c8dd | 2010-11-12 11:15:20 -0600 | [diff] [blame] | 66 | /* Number of messages to send before rescheduling */ |
| 67 | #define MAX_SEND_MSG_COUNT 25 |
| 68 | |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 69 | struct cbuf { |
| 70 | unsigned int base; |
| 71 | unsigned int len; |
| 72 | unsigned int mask; |
| 73 | }; |
| 74 | |
| 75 | static void cbuf_add(struct cbuf *cb, int n) |
| 76 | { |
| 77 | cb->len += n; |
| 78 | } |
| 79 | |
| 80 | static int cbuf_data(struct cbuf *cb) |
| 81 | { |
| 82 | return ((cb->base + cb->len) & cb->mask); |
| 83 | } |
| 84 | |
| 85 | static void cbuf_init(struct cbuf *cb, int size) |
| 86 | { |
| 87 | cb->base = cb->len = 0; |
| 88 | cb->mask = size-1; |
| 89 | } |
| 90 | |
| 91 | static void cbuf_eat(struct cbuf *cb, int n) |
| 92 | { |
| 93 | cb->len -= n; |
| 94 | cb->base += n; |
| 95 | cb->base &= cb->mask; |
| 96 | } |
| 97 | |
| 98 | static bool cbuf_empty(struct cbuf *cb) |
| 99 | { |
| 100 | return cb->len == 0; |
| 101 | } |
| 102 | |
| 103 | struct connection { |
| 104 | struct socket *sock; /* NULL if not connected */ |
| 105 | uint32_t nodeid; /* So we know who we are in the list */ |
| 106 | struct mutex sock_mutex; |
| 107 | unsigned long flags; |
| 108 | #define CF_READ_PENDING 1 |
| 109 | #define CF_WRITE_PENDING 2 |
| 110 | #define CF_CONNECT_PENDING 3 |
| 111 | #define CF_INIT_PENDING 4 |
| 112 | #define CF_IS_OTHERCON 5 |
Lars Marowsky-Bree | 063c4c9 | 2009-08-11 16:18:23 -0500 | [diff] [blame] | 113 | #define CF_CLOSE 6 |
David Miller | b36930d | 2010-11-10 21:56:39 -0800 | [diff] [blame] | 114 | #define CF_APP_LIMITED 7 |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 115 | struct list_head writequeue; /* List of outgoing writequeue_entries */ |
| 116 | spinlock_t writequeue_lock; |
| 117 | int (*rx_action) (struct connection *); /* What to do when active */ |
| 118 | void (*connect_action) (struct connection *); /* What to do to connect */ |
| 119 | struct page *rx_page; |
| 120 | struct cbuf cb; |
| 121 | int retries; |
| 122 | #define MAX_CONNECT_RETRIES 3 |
| 123 | int sctp_assoc; |
Christine Caulfield | 5e9ccc3 | 2009-01-28 12:57:40 -0600 | [diff] [blame] | 124 | struct hlist_node list; |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 125 | struct connection *othercon; |
| 126 | struct work_struct rwork; /* Receive workqueue */ |
| 127 | struct work_struct swork; /* Send workqueue */ |
Mike Christie | 98e1b60 | 2013-06-14 04:56:12 -0500 | [diff] [blame] | 128 | bool try_new_addr; |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 129 | }; |
| 130 | #define sock2con(x) ((struct connection *)(x)->sk_user_data) |
| 131 | |
| 132 | /* An entry waiting to be sent */ |
| 133 | struct writequeue_entry { |
| 134 | struct list_head list; |
| 135 | struct page *page; |
| 136 | int offset; |
| 137 | int len; |
| 138 | int end; |
| 139 | int users; |
| 140 | struct connection *con; |
| 141 | }; |
| 142 | |
David Teigland | 36b71a8 | 2012-07-26 12:44:30 -0500 | [diff] [blame] | 143 | struct dlm_node_addr { |
| 144 | struct list_head list; |
| 145 | int nodeid; |
| 146 | int addr_count; |
Mike Christie | 98e1b60 | 2013-06-14 04:56:12 -0500 | [diff] [blame] | 147 | int curr_addr_index; |
David Teigland | 36b71a8 | 2012-07-26 12:44:30 -0500 | [diff] [blame] | 148 | struct sockaddr_storage *addr[DLM_MAX_ADDR_COUNT]; |
| 149 | }; |
| 150 | |
| 151 | static LIST_HEAD(dlm_node_addrs); |
| 152 | static DEFINE_SPINLOCK(dlm_node_addrs_spin); |
| 153 | |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 154 | static struct sockaddr_storage *dlm_local_addr[DLM_MAX_ADDR_COUNT]; |
| 155 | static int dlm_local_count; |
David Teigland | 513ef59 | 2012-03-30 11:46:08 -0500 | [diff] [blame] | 156 | static int dlm_allow_conn; |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 157 | |
| 158 | /* Work queues */ |
| 159 | static struct workqueue_struct *recv_workqueue; |
| 160 | static struct workqueue_struct *send_workqueue; |
| 161 | |
Christine Caulfield | 5e9ccc3 | 2009-01-28 12:57:40 -0600 | [diff] [blame] | 162 | static struct hlist_head connection_hash[CONN_HASH_SIZE]; |
Matthias Kaehlcke | 7a936ce | 2008-05-12 10:04:51 -0500 | [diff] [blame] | 163 | static DEFINE_MUTEX(connections_lock); |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 164 | static struct kmem_cache *con_cache; |
| 165 | |
| 166 | static void process_recv_sockets(struct work_struct *work); |
| 167 | static void process_send_sockets(struct work_struct *work); |
| 168 | |
Christine Caulfield | 5e9ccc3 | 2009-01-28 12:57:40 -0600 | [diff] [blame] | 169 | |
| 170 | /* This is deliberately very simple because most clusters have simple |
| 171 | sequential nodeids, so we should be able to go straight to a connection |
| 172 | struct in the array */ |
| 173 | static inline int nodeid_hash(int nodeid) |
| 174 | { |
| 175 | return nodeid & (CONN_HASH_SIZE-1); |
| 176 | } |
| 177 | |
| 178 | static struct connection *__find_con(int nodeid) |
| 179 | { |
| 180 | int r; |
Christine Caulfield | 5e9ccc3 | 2009-01-28 12:57:40 -0600 | [diff] [blame] | 181 | struct connection *con; |
| 182 | |
| 183 | r = nodeid_hash(nodeid); |
| 184 | |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 185 | hlist_for_each_entry(con, &connection_hash[r], list) { |
Christine Caulfield | 5e9ccc3 | 2009-01-28 12:57:40 -0600 | [diff] [blame] | 186 | if (con->nodeid == nodeid) |
| 187 | return con; |
| 188 | } |
| 189 | return NULL; |
| 190 | } |
| 191 | |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 192 | /* |
| 193 | * If 'allocation' is zero then we don't attempt to create a new |
| 194 | * connection structure for this node. |
| 195 | */ |
| 196 | static struct connection *__nodeid2con(int nodeid, gfp_t alloc) |
| 197 | { |
| 198 | struct connection *con = NULL; |
| 199 | int r; |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 200 | |
Christine Caulfield | 5e9ccc3 | 2009-01-28 12:57:40 -0600 | [diff] [blame] | 201 | con = __find_con(nodeid); |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 202 | if (con || !alloc) |
| 203 | return con; |
| 204 | |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 205 | con = kmem_cache_zalloc(con_cache, alloc); |
| 206 | if (!con) |
| 207 | return NULL; |
| 208 | |
Christine Caulfield | 5e9ccc3 | 2009-01-28 12:57:40 -0600 | [diff] [blame] | 209 | r = nodeid_hash(nodeid); |
| 210 | hlist_add_head(&con->list, &connection_hash[r]); |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 211 | |
| 212 | con->nodeid = nodeid; |
| 213 | mutex_init(&con->sock_mutex); |
| 214 | INIT_LIST_HEAD(&con->writequeue); |
| 215 | spin_lock_init(&con->writequeue_lock); |
| 216 | INIT_WORK(&con->swork, process_send_sockets); |
| 217 | INIT_WORK(&con->rwork, process_recv_sockets); |
| 218 | |
| 219 | /* Setup action pointers for child sockets */ |
| 220 | if (con->nodeid) { |
Christine Caulfield | 5e9ccc3 | 2009-01-28 12:57:40 -0600 | [diff] [blame] | 221 | struct connection *zerocon = __find_con(0); |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 222 | |
| 223 | con->connect_action = zerocon->connect_action; |
| 224 | if (!con->rx_action) |
| 225 | con->rx_action = zerocon->rx_action; |
| 226 | } |
| 227 | |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 228 | return con; |
| 229 | } |
| 230 | |
Christine Caulfield | 5e9ccc3 | 2009-01-28 12:57:40 -0600 | [diff] [blame] | 231 | /* Loop round all connections */ |
| 232 | static void foreach_conn(void (*conn_func)(struct connection *c)) |
| 233 | { |
| 234 | int i; |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 235 | struct hlist_node *n; |
Christine Caulfield | 5e9ccc3 | 2009-01-28 12:57:40 -0600 | [diff] [blame] | 236 | struct connection *con; |
| 237 | |
| 238 | for (i = 0; i < CONN_HASH_SIZE; i++) { |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 239 | hlist_for_each_entry_safe(con, n, &connection_hash[i], list) |
Christine Caulfield | 5e9ccc3 | 2009-01-28 12:57:40 -0600 | [diff] [blame] | 240 | conn_func(con); |
Christine Caulfield | 5e9ccc3 | 2009-01-28 12:57:40 -0600 | [diff] [blame] | 241 | } |
| 242 | } |
| 243 | |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 244 | static struct connection *nodeid2con(int nodeid, gfp_t allocation) |
| 245 | { |
| 246 | struct connection *con; |
| 247 | |
Matthias Kaehlcke | 7a936ce | 2008-05-12 10:04:51 -0500 | [diff] [blame] | 248 | mutex_lock(&connections_lock); |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 249 | con = __nodeid2con(nodeid, allocation); |
Matthias Kaehlcke | 7a936ce | 2008-05-12 10:04:51 -0500 | [diff] [blame] | 250 | mutex_unlock(&connections_lock); |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 251 | |
| 252 | return con; |
| 253 | } |
| 254 | |
| 255 | /* This is a bit drastic, but only called when things go wrong */ |
| 256 | static struct connection *assoc2con(int assoc_id) |
| 257 | { |
| 258 | int i; |
| 259 | struct connection *con; |
| 260 | |
Matthias Kaehlcke | 7a936ce | 2008-05-12 10:04:51 -0500 | [diff] [blame] | 261 | mutex_lock(&connections_lock); |
Christine Caulfield | 5e9ccc3 | 2009-01-28 12:57:40 -0600 | [diff] [blame] | 262 | |
| 263 | for (i = 0 ; i < CONN_HASH_SIZE; i++) { |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 264 | hlist_for_each_entry(con, &connection_hash[i], list) { |
Julia Lawall | f70cb33 | 2010-08-03 23:34:16 +0200 | [diff] [blame] | 265 | if (con->sctp_assoc == assoc_id) { |
Christine Caulfield | 5e9ccc3 | 2009-01-28 12:57:40 -0600 | [diff] [blame] | 266 | mutex_unlock(&connections_lock); |
| 267 | return con; |
| 268 | } |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 269 | } |
| 270 | } |
Matthias Kaehlcke | 7a936ce | 2008-05-12 10:04:51 -0500 | [diff] [blame] | 271 | mutex_unlock(&connections_lock); |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 272 | return NULL; |
| 273 | } |
| 274 | |
David Teigland | 36b71a8 | 2012-07-26 12:44:30 -0500 | [diff] [blame] | 275 | static struct dlm_node_addr *find_node_addr(int nodeid) |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 276 | { |
David Teigland | 36b71a8 | 2012-07-26 12:44:30 -0500 | [diff] [blame] | 277 | struct dlm_node_addr *na; |
| 278 | |
| 279 | list_for_each_entry(na, &dlm_node_addrs, list) { |
| 280 | if (na->nodeid == nodeid) |
| 281 | return na; |
| 282 | } |
| 283 | return NULL; |
| 284 | } |
| 285 | |
| 286 | static int addr_compare(struct sockaddr_storage *x, struct sockaddr_storage *y) |
| 287 | { |
| 288 | switch (x->ss_family) { |
| 289 | case AF_INET: { |
| 290 | struct sockaddr_in *sinx = (struct sockaddr_in *)x; |
| 291 | struct sockaddr_in *siny = (struct sockaddr_in *)y; |
| 292 | if (sinx->sin_addr.s_addr != siny->sin_addr.s_addr) |
| 293 | return 0; |
| 294 | if (sinx->sin_port != siny->sin_port) |
| 295 | return 0; |
| 296 | break; |
| 297 | } |
| 298 | case AF_INET6: { |
| 299 | struct sockaddr_in6 *sinx = (struct sockaddr_in6 *)x; |
| 300 | struct sockaddr_in6 *siny = (struct sockaddr_in6 *)y; |
| 301 | if (!ipv6_addr_equal(&sinx->sin6_addr, &siny->sin6_addr)) |
| 302 | return 0; |
| 303 | if (sinx->sin6_port != siny->sin6_port) |
| 304 | return 0; |
| 305 | break; |
| 306 | } |
| 307 | default: |
| 308 | return 0; |
| 309 | } |
| 310 | return 1; |
| 311 | } |
| 312 | |
| 313 | static int nodeid_to_addr(int nodeid, struct sockaddr_storage *sas_out, |
Mike Christie | 98e1b60 | 2013-06-14 04:56:12 -0500 | [diff] [blame] | 314 | struct sockaddr *sa_out, bool try_new_addr) |
David Teigland | 36b71a8 | 2012-07-26 12:44:30 -0500 | [diff] [blame] | 315 | { |
| 316 | struct sockaddr_storage sas; |
| 317 | struct dlm_node_addr *na; |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 318 | |
| 319 | if (!dlm_local_count) |
| 320 | return -1; |
| 321 | |
David Teigland | 36b71a8 | 2012-07-26 12:44:30 -0500 | [diff] [blame] | 322 | spin_lock(&dlm_node_addrs_spin); |
| 323 | na = find_node_addr(nodeid); |
Mike Christie | 98e1b60 | 2013-06-14 04:56:12 -0500 | [diff] [blame] | 324 | if (na && na->addr_count) { |
| 325 | if (try_new_addr) { |
| 326 | na->curr_addr_index++; |
| 327 | if (na->curr_addr_index == na->addr_count) |
| 328 | na->curr_addr_index = 0; |
| 329 | } |
| 330 | |
| 331 | memcpy(&sas, na->addr[na->curr_addr_index ], |
| 332 | sizeof(struct sockaddr_storage)); |
| 333 | } |
David Teigland | 36b71a8 | 2012-07-26 12:44:30 -0500 | [diff] [blame] | 334 | spin_unlock(&dlm_node_addrs_spin); |
| 335 | |
| 336 | if (!na) |
| 337 | return -EEXIST; |
| 338 | |
| 339 | if (!na->addr_count) |
| 340 | return -ENOENT; |
| 341 | |
| 342 | if (sas_out) |
| 343 | memcpy(sas_out, &sas, sizeof(struct sockaddr_storage)); |
| 344 | |
| 345 | if (!sa_out) |
| 346 | return 0; |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 347 | |
| 348 | if (dlm_local_addr[0]->ss_family == AF_INET) { |
David Teigland | 36b71a8 | 2012-07-26 12:44:30 -0500 | [diff] [blame] | 349 | struct sockaddr_in *in4 = (struct sockaddr_in *) &sas; |
| 350 | struct sockaddr_in *ret4 = (struct sockaddr_in *) sa_out; |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 351 | ret4->sin_addr.s_addr = in4->sin_addr.s_addr; |
| 352 | } else { |
David Teigland | 36b71a8 | 2012-07-26 12:44:30 -0500 | [diff] [blame] | 353 | struct sockaddr_in6 *in6 = (struct sockaddr_in6 *) &sas; |
| 354 | struct sockaddr_in6 *ret6 = (struct sockaddr_in6 *) sa_out; |
Alexey Dobriyan | 4e3fd7a | 2011-11-21 03:39:03 +0000 | [diff] [blame] | 355 | ret6->sin6_addr = in6->sin6_addr; |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 356 | } |
| 357 | |
| 358 | return 0; |
| 359 | } |
| 360 | |
David Teigland | 36b71a8 | 2012-07-26 12:44:30 -0500 | [diff] [blame] | 361 | static int addr_to_nodeid(struct sockaddr_storage *addr, int *nodeid) |
| 362 | { |
| 363 | struct dlm_node_addr *na; |
| 364 | int rv = -EEXIST; |
Mike Christie | 98e1b60 | 2013-06-14 04:56:12 -0500 | [diff] [blame] | 365 | int addr_i; |
David Teigland | 36b71a8 | 2012-07-26 12:44:30 -0500 | [diff] [blame] | 366 | |
| 367 | spin_lock(&dlm_node_addrs_spin); |
| 368 | list_for_each_entry(na, &dlm_node_addrs, list) { |
| 369 | if (!na->addr_count) |
| 370 | continue; |
| 371 | |
Mike Christie | 98e1b60 | 2013-06-14 04:56:12 -0500 | [diff] [blame] | 372 | for (addr_i = 0; addr_i < na->addr_count; addr_i++) { |
| 373 | if (addr_compare(na->addr[addr_i], addr)) { |
| 374 | *nodeid = na->nodeid; |
| 375 | rv = 0; |
| 376 | goto unlock; |
| 377 | } |
| 378 | } |
David Teigland | 36b71a8 | 2012-07-26 12:44:30 -0500 | [diff] [blame] | 379 | } |
Mike Christie | 98e1b60 | 2013-06-14 04:56:12 -0500 | [diff] [blame] | 380 | unlock: |
David Teigland | 36b71a8 | 2012-07-26 12:44:30 -0500 | [diff] [blame] | 381 | spin_unlock(&dlm_node_addrs_spin); |
| 382 | return rv; |
| 383 | } |
| 384 | |
| 385 | int dlm_lowcomms_addr(int nodeid, struct sockaddr_storage *addr, int len) |
| 386 | { |
| 387 | struct sockaddr_storage *new_addr; |
| 388 | struct dlm_node_addr *new_node, *na; |
| 389 | |
| 390 | new_node = kzalloc(sizeof(struct dlm_node_addr), GFP_NOFS); |
| 391 | if (!new_node) |
| 392 | return -ENOMEM; |
| 393 | |
| 394 | new_addr = kzalloc(sizeof(struct sockaddr_storage), GFP_NOFS); |
| 395 | if (!new_addr) { |
| 396 | kfree(new_node); |
| 397 | return -ENOMEM; |
| 398 | } |
| 399 | |
| 400 | memcpy(new_addr, addr, len); |
| 401 | |
| 402 | spin_lock(&dlm_node_addrs_spin); |
| 403 | na = find_node_addr(nodeid); |
| 404 | if (!na) { |
| 405 | new_node->nodeid = nodeid; |
| 406 | new_node->addr[0] = new_addr; |
| 407 | new_node->addr_count = 1; |
| 408 | list_add(&new_node->list, &dlm_node_addrs); |
| 409 | spin_unlock(&dlm_node_addrs_spin); |
| 410 | return 0; |
| 411 | } |
| 412 | |
| 413 | if (na->addr_count >= DLM_MAX_ADDR_COUNT) { |
| 414 | spin_unlock(&dlm_node_addrs_spin); |
| 415 | kfree(new_addr); |
| 416 | kfree(new_node); |
| 417 | return -ENOSPC; |
| 418 | } |
| 419 | |
| 420 | na->addr[na->addr_count++] = new_addr; |
| 421 | spin_unlock(&dlm_node_addrs_spin); |
| 422 | kfree(new_node); |
| 423 | return 0; |
| 424 | } |
| 425 | |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 426 | /* Data available on socket or listen socket received a connect */ |
| 427 | static void lowcomms_data_ready(struct sock *sk, int count_unused) |
| 428 | { |
| 429 | struct connection *con = sock2con(sk); |
Patrick Caulfield | afb853f | 2007-06-01 10:07:26 -0500 | [diff] [blame] | 430 | if (con && !test_and_set_bit(CF_READ_PENDING, &con->flags)) |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 431 | queue_work(recv_workqueue, &con->rwork); |
| 432 | } |
| 433 | |
| 434 | static void lowcomms_write_space(struct sock *sk) |
| 435 | { |
| 436 | struct connection *con = sock2con(sk); |
| 437 | |
David Miller | b36930d | 2010-11-10 21:56:39 -0800 | [diff] [blame] | 438 | if (!con) |
| 439 | return; |
| 440 | |
| 441 | clear_bit(SOCK_NOSPACE, &con->sock->flags); |
| 442 | |
| 443 | if (test_and_clear_bit(CF_APP_LIMITED, &con->flags)) { |
| 444 | con->sock->sk->sk_write_pending--; |
| 445 | clear_bit(SOCK_ASYNC_NOSPACE, &con->sock->flags); |
| 446 | } |
| 447 | |
| 448 | if (!test_and_set_bit(CF_WRITE_PENDING, &con->flags)) |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 449 | queue_work(send_workqueue, &con->swork); |
| 450 | } |
| 451 | |
| 452 | static inline void lowcomms_connect_sock(struct connection *con) |
| 453 | { |
Lars Marowsky-Bree | 063c4c9 | 2009-08-11 16:18:23 -0500 | [diff] [blame] | 454 | if (test_bit(CF_CLOSE, &con->flags)) |
| 455 | return; |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 456 | if (!test_and_set_bit(CF_CONNECT_PENDING, &con->flags)) |
| 457 | queue_work(send_workqueue, &con->swork); |
| 458 | } |
| 459 | |
| 460 | static void lowcomms_state_change(struct sock *sk) |
| 461 | { |
| 462 | if (sk->sk_state == TCP_ESTABLISHED) |
| 463 | lowcomms_write_space(sk); |
| 464 | } |
| 465 | |
Christine Caulfield | 391fbdc | 2009-05-07 10:54:16 -0500 | [diff] [blame] | 466 | int dlm_lowcomms_connect_node(int nodeid) |
| 467 | { |
| 468 | struct connection *con; |
| 469 | |
David Teigland | 04bedd7 | 2009-09-18 14:31:47 -0500 | [diff] [blame] | 470 | /* with sctp there's no connecting without sending */ |
| 471 | if (dlm_config.ci_protocol != 0) |
| 472 | return 0; |
| 473 | |
Christine Caulfield | 391fbdc | 2009-05-07 10:54:16 -0500 | [diff] [blame] | 474 | if (nodeid == dlm_our_nodeid()) |
| 475 | return 0; |
| 476 | |
| 477 | con = nodeid2con(nodeid, GFP_NOFS); |
| 478 | if (!con) |
| 479 | return -ENOMEM; |
| 480 | lowcomms_connect_sock(con); |
| 481 | return 0; |
| 482 | } |
| 483 | |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 484 | /* Make a socket active */ |
Ying Xue | 4dd40f0 | 2012-08-10 14:58:42 +0800 | [diff] [blame] | 485 | static void add_sock(struct socket *sock, struct connection *con) |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 486 | { |
| 487 | con->sock = sock; |
| 488 | |
| 489 | /* Install a data_ready callback */ |
| 490 | con->sock->sk->sk_data_ready = lowcomms_data_ready; |
| 491 | con->sock->sk->sk_write_space = lowcomms_write_space; |
| 492 | con->sock->sk->sk_state_change = lowcomms_state_change; |
| 493 | con->sock->sk->sk_user_data = con; |
Steven Whitehouse | d6d7b70 | 2008-11-12 16:49:48 -0600 | [diff] [blame] | 494 | con->sock->sk->sk_allocation = GFP_NOFS; |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 495 | } |
| 496 | |
| 497 | /* Add the port number to an IPv6 or 4 sockaddr and return the address |
| 498 | length */ |
| 499 | static void make_sockaddr(struct sockaddr_storage *saddr, uint16_t port, |
| 500 | int *addr_len) |
| 501 | { |
| 502 | saddr->ss_family = dlm_local_addr[0]->ss_family; |
| 503 | if (saddr->ss_family == AF_INET) { |
| 504 | struct sockaddr_in *in4_addr = (struct sockaddr_in *)saddr; |
| 505 | in4_addr->sin_port = cpu_to_be16(port); |
| 506 | *addr_len = sizeof(struct sockaddr_in); |
| 507 | memset(&in4_addr->sin_zero, 0, sizeof(in4_addr->sin_zero)); |
| 508 | } else { |
| 509 | struct sockaddr_in6 *in6_addr = (struct sockaddr_in6 *)saddr; |
| 510 | in6_addr->sin6_port = cpu_to_be16(port); |
| 511 | *addr_len = sizeof(struct sockaddr_in6); |
| 512 | } |
Patrick Caulfield | 01c8cab | 2007-07-17 16:53:15 +0100 | [diff] [blame] | 513 | memset((char *)saddr + *addr_len, 0, sizeof(struct sockaddr_storage) - *addr_len); |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 514 | } |
| 515 | |
| 516 | /* Close a remote connection and tidy up */ |
| 517 | static void close_connection(struct connection *con, bool and_other) |
| 518 | { |
| 519 | mutex_lock(&con->sock_mutex); |
| 520 | |
| 521 | if (con->sock) { |
| 522 | sock_release(con->sock); |
| 523 | con->sock = NULL; |
| 524 | } |
| 525 | if (con->othercon && and_other) { |
| 526 | /* Will only re-enter once. */ |
| 527 | close_connection(con->othercon, false); |
| 528 | } |
| 529 | if (con->rx_page) { |
| 530 | __free_page(con->rx_page); |
| 531 | con->rx_page = NULL; |
| 532 | } |
Patrick Caulfield | 9e5f282 | 2007-08-02 14:58:14 +0100 | [diff] [blame] | 533 | |
Patrick Caulfield | 61d96be | 2007-08-20 15:13:38 +0100 | [diff] [blame] | 534 | con->retries = 0; |
| 535 | mutex_unlock(&con->sock_mutex); |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 536 | } |
| 537 | |
| 538 | /* We only send shutdown messages to nodes that are not part of the cluster */ |
| 539 | static void sctp_send_shutdown(sctp_assoc_t associd) |
| 540 | { |
| 541 | static char outcmsg[CMSG_SPACE(sizeof(struct sctp_sndrcvinfo))]; |
| 542 | struct msghdr outmessage; |
| 543 | struct cmsghdr *cmsg; |
| 544 | struct sctp_sndrcvinfo *sinfo; |
| 545 | int ret; |
| 546 | struct connection *con; |
| 547 | |
| 548 | con = nodeid2con(0,0); |
| 549 | BUG_ON(con == NULL); |
| 550 | |
| 551 | outmessage.msg_name = NULL; |
| 552 | outmessage.msg_namelen = 0; |
| 553 | outmessage.msg_control = outcmsg; |
| 554 | outmessage.msg_controllen = sizeof(outcmsg); |
| 555 | outmessage.msg_flags = MSG_EOR; |
| 556 | |
| 557 | cmsg = CMSG_FIRSTHDR(&outmessage); |
| 558 | cmsg->cmsg_level = IPPROTO_SCTP; |
| 559 | cmsg->cmsg_type = SCTP_SNDRCV; |
| 560 | cmsg->cmsg_len = CMSG_LEN(sizeof(struct sctp_sndrcvinfo)); |
| 561 | outmessage.msg_controllen = cmsg->cmsg_len; |
| 562 | sinfo = CMSG_DATA(cmsg); |
| 563 | memset(sinfo, 0x00, sizeof(struct sctp_sndrcvinfo)); |
| 564 | |
| 565 | sinfo->sinfo_flags |= MSG_EOF; |
| 566 | sinfo->sinfo_assoc_id = associd; |
| 567 | |
| 568 | ret = kernel_sendmsg(con->sock, &outmessage, NULL, 0, 0); |
| 569 | |
| 570 | if (ret != 0) |
| 571 | log_print("send EOF to node failed: %d", ret); |
| 572 | } |
| 573 | |
Christine Caulfield | 5e9ccc3 | 2009-01-28 12:57:40 -0600 | [diff] [blame] | 574 | static void sctp_init_failed_foreach(struct connection *con) |
| 575 | { |
Mike Christie | 98e1b60 | 2013-06-14 04:56:12 -0500 | [diff] [blame] | 576 | |
| 577 | /* |
| 578 | * Don't try to recover base con and handle race where the |
| 579 | * other node's assoc init creates a assoc and we get that |
| 580 | * notification, then we get a notification that our attempt |
| 581 | * failed due. This happens when we are still trying the primary |
| 582 | * address, but the other node has already tried secondary addrs |
| 583 | * and found one that worked. |
| 584 | */ |
| 585 | if (!con->nodeid || con->sctp_assoc) |
| 586 | return; |
| 587 | |
| 588 | log_print("Retrying SCTP association init for node %d\n", con->nodeid); |
| 589 | |
| 590 | con->try_new_addr = true; |
Christine Caulfield | 5e9ccc3 | 2009-01-28 12:57:40 -0600 | [diff] [blame] | 591 | con->sctp_assoc = 0; |
Mike Christie | b390ca3 | 2013-06-14 04:56:11 -0500 | [diff] [blame] | 592 | if (test_and_clear_bit(CF_INIT_PENDING, &con->flags)) { |
Christine Caulfield | 5e9ccc3 | 2009-01-28 12:57:40 -0600 | [diff] [blame] | 593 | if (!test_and_set_bit(CF_WRITE_PENDING, &con->flags)) |
| 594 | queue_work(send_workqueue, &con->swork); |
| 595 | } |
| 596 | } |
| 597 | |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 598 | /* INIT failed but we don't know which node... |
| 599 | restart INIT on all pending nodes */ |
| 600 | static void sctp_init_failed(void) |
| 601 | { |
Matthias Kaehlcke | 7a936ce | 2008-05-12 10:04:51 -0500 | [diff] [blame] | 602 | mutex_lock(&connections_lock); |
Christine Caulfield | 5e9ccc3 | 2009-01-28 12:57:40 -0600 | [diff] [blame] | 603 | |
| 604 | foreach_conn(sctp_init_failed_foreach); |
| 605 | |
Matthias Kaehlcke | 7a936ce | 2008-05-12 10:04:51 -0500 | [diff] [blame] | 606 | mutex_unlock(&connections_lock); |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 607 | } |
| 608 | |
Mike Christie | 5d68987 | 2013-06-14 04:56:13 -0500 | [diff] [blame] | 609 | static void retry_failed_sctp_send(struct connection *recv_con, |
| 610 | struct sctp_send_failed *sn_send_failed, |
| 611 | char *buf) |
| 612 | { |
| 613 | int len = sn_send_failed->ssf_length - sizeof(struct sctp_send_failed); |
| 614 | struct dlm_mhandle *mh; |
| 615 | struct connection *con; |
| 616 | char *retry_buf; |
| 617 | int nodeid = sn_send_failed->ssf_info.sinfo_ppid; |
| 618 | |
| 619 | log_print("Retry sending %d bytes to node id %d", len, nodeid); |
| 620 | |
| 621 | con = nodeid2con(nodeid, 0); |
| 622 | if (!con) { |
| 623 | log_print("Could not look up con for nodeid %d\n", |
| 624 | nodeid); |
| 625 | return; |
| 626 | } |
| 627 | |
| 628 | mh = dlm_lowcomms_get_buffer(nodeid, len, GFP_NOFS, &retry_buf); |
| 629 | if (!mh) { |
| 630 | log_print("Could not allocate buf for retry."); |
| 631 | return; |
| 632 | } |
| 633 | memcpy(retry_buf, buf + sizeof(struct sctp_send_failed), len); |
| 634 | dlm_lowcomms_commit_buffer(mh); |
| 635 | |
| 636 | /* |
| 637 | * If we got a assoc changed event before the send failed event then |
| 638 | * we only need to retry the send. |
| 639 | */ |
| 640 | if (con->sctp_assoc) { |
| 641 | if (!test_and_set_bit(CF_WRITE_PENDING, &con->flags)) |
| 642 | queue_work(send_workqueue, &con->swork); |
| 643 | } else |
| 644 | sctp_init_failed_foreach(con); |
| 645 | } |
| 646 | |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 647 | /* Something happened to an association */ |
David Teigland | 617e82e | 2007-04-26 13:46:49 -0500 | [diff] [blame] | 648 | static void process_sctp_notification(struct connection *con, |
| 649 | struct msghdr *msg, char *buf) |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 650 | { |
| 651 | union sctp_notification *sn = (union sctp_notification *)buf; |
Dongmao Zhang | ece3584 | 2013-12-10 10:52:22 -0600 | [diff] [blame] | 652 | struct linger linger; |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 653 | |
Mike Christie | 5d68987 | 2013-06-14 04:56:13 -0500 | [diff] [blame] | 654 | switch (sn->sn_header.sn_type) { |
| 655 | case SCTP_SEND_FAILED: |
| 656 | retry_failed_sctp_send(con, &sn->sn_send_failed, buf); |
| 657 | break; |
| 658 | case SCTP_ASSOC_CHANGE: |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 659 | switch (sn->sn_assoc_change.sac_state) { |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 660 | case SCTP_COMM_UP: |
| 661 | case SCTP_RESTART: |
| 662 | { |
| 663 | /* Check that the new node is in the lockspace */ |
| 664 | struct sctp_prim prim; |
| 665 | int nodeid; |
| 666 | int prim_len, ret; |
| 667 | int addr_len; |
| 668 | struct connection *new_con; |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 669 | |
| 670 | /* |
| 671 | * We get this before any data for an association. |
| 672 | * We verify that the node is in the cluster and |
| 673 | * then peel off a socket for it. |
| 674 | */ |
| 675 | if ((int)sn->sn_assoc_change.sac_assoc_id <= 0) { |
| 676 | log_print("COMM_UP for invalid assoc ID %d", |
David Teigland | 617e82e | 2007-04-26 13:46:49 -0500 | [diff] [blame] | 677 | (int)sn->sn_assoc_change.sac_assoc_id); |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 678 | sctp_init_failed(); |
| 679 | return; |
| 680 | } |
| 681 | memset(&prim, 0, sizeof(struct sctp_prim)); |
| 682 | prim_len = sizeof(struct sctp_prim); |
| 683 | prim.ssp_assoc_id = sn->sn_assoc_change.sac_assoc_id; |
| 684 | |
| 685 | ret = kernel_getsockopt(con->sock, |
| 686 | IPPROTO_SCTP, |
| 687 | SCTP_PRIMARY_ADDR, |
| 688 | (char*)&prim, |
| 689 | &prim_len); |
| 690 | if (ret < 0) { |
| 691 | log_print("getsockopt/sctp_primary_addr on " |
| 692 | "new assoc %d failed : %d", |
| 693 | (int)sn->sn_assoc_change.sac_assoc_id, |
| 694 | ret); |
| 695 | |
| 696 | /* Retry INIT later */ |
| 697 | new_con = assoc2con(sn->sn_assoc_change.sac_assoc_id); |
| 698 | if (new_con) |
| 699 | clear_bit(CF_CONNECT_PENDING, &con->flags); |
| 700 | return; |
| 701 | } |
| 702 | make_sockaddr(&prim.ssp_addr, 0, &addr_len); |
David Teigland | 36b71a8 | 2012-07-26 12:44:30 -0500 | [diff] [blame] | 703 | if (addr_to_nodeid(&prim.ssp_addr, &nodeid)) { |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 704 | unsigned char *b=(unsigned char *)&prim.ssp_addr; |
| 705 | log_print("reject connect from unknown addr"); |
Masatake YAMATO | bcaadf5 | 2011-07-04 12:25:51 +0900 | [diff] [blame] | 706 | print_hex_dump_bytes("ss: ", DUMP_PREFIX_NONE, |
| 707 | b, sizeof(struct sockaddr_storage)); |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 708 | sctp_send_shutdown(prim.ssp_assoc_id); |
| 709 | return; |
| 710 | } |
| 711 | |
David Teigland | 748285c | 2009-05-15 10:50:57 -0500 | [diff] [blame] | 712 | new_con = nodeid2con(nodeid, GFP_NOFS); |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 713 | if (!new_con) |
| 714 | return; |
| 715 | |
| 716 | /* Peel off a new sock */ |
wangweidong | 048ed4b | 2014-01-21 15:44:11 +0800 | [diff] [blame] | 717 | lock_sock(con->sock->sk); |
Benjamin Poirier | 2f2d76c | 2012-03-08 05:55:59 +0000 | [diff] [blame] | 718 | ret = sctp_do_peeloff(con->sock->sk, |
| 719 | sn->sn_assoc_change.sac_assoc_id, |
| 720 | &new_con->sock); |
wangweidong | 048ed4b | 2014-01-21 15:44:11 +0800 | [diff] [blame] | 721 | release_sock(con->sock->sk); |
David Teigland | 6861f35 | 2009-09-24 15:58:23 -0500 | [diff] [blame] | 722 | if (ret < 0) { |
David Teigland | 617e82e | 2007-04-26 13:46:49 -0500 | [diff] [blame] | 723 | log_print("Can't peel off a socket for " |
David Teigland | 6861f35 | 2009-09-24 15:58:23 -0500 | [diff] [blame] | 724 | "connection %d to node %d: err=%d", |
Benjamin Poirier | 2f2d76c | 2012-03-08 05:55:59 +0000 | [diff] [blame] | 725 | (int)sn->sn_assoc_change.sac_assoc_id, |
| 726 | nodeid, ret); |
David Teigland | 6861f35 | 2009-09-24 15:58:23 -0500 | [diff] [blame] | 727 | return; |
| 728 | } |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 729 | add_sock(new_con->sock, new_con); |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 730 | |
Dongmao Zhang | ece3584 | 2013-12-10 10:52:22 -0600 | [diff] [blame] | 731 | linger.l_onoff = 1; |
| 732 | linger.l_linger = 0; |
| 733 | ret = kernel_setsockopt(new_con->sock, SOL_SOCKET, SO_LINGER, |
| 734 | (char *)&linger, sizeof(linger)); |
| 735 | if (ret < 0) |
| 736 | log_print("set socket option SO_LINGER failed"); |
| 737 | |
David Teigland | 6861f35 | 2009-09-24 15:58:23 -0500 | [diff] [blame] | 738 | log_print("connecting to %d sctp association %d", |
| 739 | nodeid, (int)sn->sn_assoc_change.sac_assoc_id); |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 740 | |
Mike Christie | e1631d0 | 2013-06-14 04:56:10 -0500 | [diff] [blame] | 741 | new_con->sctp_assoc = sn->sn_assoc_change.sac_assoc_id; |
Mike Christie | 98e1b60 | 2013-06-14 04:56:12 -0500 | [diff] [blame] | 742 | new_con->try_new_addr = false; |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 743 | /* Send any pending writes */ |
| 744 | clear_bit(CF_CONNECT_PENDING, &new_con->flags); |
Mike Christie | efad7e6 | 2013-06-14 04:56:09 -0500 | [diff] [blame] | 745 | clear_bit(CF_INIT_PENDING, &new_con->flags); |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 746 | if (!test_and_set_bit(CF_WRITE_PENDING, &new_con->flags)) { |
| 747 | queue_work(send_workqueue, &new_con->swork); |
| 748 | } |
| 749 | if (!test_and_set_bit(CF_READ_PENDING, &new_con->flags)) |
| 750 | queue_work(recv_workqueue, &new_con->rwork); |
| 751 | } |
| 752 | break; |
| 753 | |
| 754 | case SCTP_COMM_LOST: |
| 755 | case SCTP_SHUTDOWN_COMP: |
| 756 | { |
| 757 | con = assoc2con(sn->sn_assoc_change.sac_assoc_id); |
| 758 | if (con) { |
| 759 | con->sctp_assoc = 0; |
| 760 | } |
| 761 | } |
| 762 | break; |
| 763 | |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 764 | case SCTP_CANT_STR_ASSOC: |
| 765 | { |
Mike Christie | 5d68987 | 2013-06-14 04:56:13 -0500 | [diff] [blame] | 766 | /* Will retry init when we get the send failed notification */ |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 767 | log_print("Can't start SCTP association - retrying"); |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 768 | } |
| 769 | break; |
| 770 | |
| 771 | default: |
| 772 | log_print("unexpected SCTP assoc change id=%d state=%d", |
| 773 | (int)sn->sn_assoc_change.sac_assoc_id, |
| 774 | sn->sn_assoc_change.sac_state); |
| 775 | } |
Mike Christie | 5d68987 | 2013-06-14 04:56:13 -0500 | [diff] [blame] | 776 | default: |
| 777 | ; /* fall through */ |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 778 | } |
| 779 | } |
| 780 | |
| 781 | /* Data received from remote end */ |
| 782 | static int receive_from_sock(struct connection *con) |
| 783 | { |
| 784 | int ret = 0; |
| 785 | struct msghdr msg = {}; |
| 786 | struct kvec iov[2]; |
| 787 | unsigned len; |
| 788 | int r; |
| 789 | int call_again_soon = 0; |
| 790 | int nvec; |
| 791 | char incmsg[CMSG_SPACE(sizeof(struct sctp_sndrcvinfo))]; |
| 792 | |
| 793 | mutex_lock(&con->sock_mutex); |
| 794 | |
| 795 | if (con->sock == NULL) { |
| 796 | ret = -EAGAIN; |
| 797 | goto out_close; |
| 798 | } |
| 799 | |
| 800 | if (con->rx_page == NULL) { |
| 801 | /* |
| 802 | * This doesn't need to be atomic, but I think it should |
| 803 | * improve performance if it is. |
| 804 | */ |
| 805 | con->rx_page = alloc_page(GFP_ATOMIC); |
| 806 | if (con->rx_page == NULL) |
| 807 | goto out_resched; |
| 808 | cbuf_init(&con->cb, PAGE_CACHE_SIZE); |
| 809 | } |
| 810 | |
| 811 | /* Only SCTP needs these really */ |
| 812 | memset(&incmsg, 0, sizeof(incmsg)); |
| 813 | msg.msg_control = incmsg; |
| 814 | msg.msg_controllen = sizeof(incmsg); |
| 815 | |
| 816 | /* |
| 817 | * iov[0] is the bit of the circular buffer between the current end |
| 818 | * point (cb.base + cb.len) and the end of the buffer. |
| 819 | */ |
| 820 | iov[0].iov_len = con->cb.base - cbuf_data(&con->cb); |
| 821 | iov[0].iov_base = page_address(con->rx_page) + cbuf_data(&con->cb); |
| 822 | iov[1].iov_len = 0; |
| 823 | nvec = 1; |
| 824 | |
| 825 | /* |
| 826 | * iov[1] is the bit of the circular buffer between the start of the |
| 827 | * buffer and the start of the currently used section (cb.base) |
| 828 | */ |
| 829 | if (cbuf_data(&con->cb) >= con->cb.base) { |
| 830 | iov[0].iov_len = PAGE_CACHE_SIZE - cbuf_data(&con->cb); |
| 831 | iov[1].iov_len = con->cb.base; |
| 832 | iov[1].iov_base = page_address(con->rx_page); |
| 833 | nvec = 2; |
| 834 | } |
| 835 | len = iov[0].iov_len + iov[1].iov_len; |
| 836 | |
| 837 | r = ret = kernel_recvmsg(con->sock, &msg, iov, nvec, len, |
| 838 | MSG_DONTWAIT | MSG_NOSIGNAL); |
| 839 | if (ret <= 0) |
| 840 | goto out_close; |
| 841 | |
| 842 | /* Process SCTP notifications */ |
| 843 | if (msg.msg_flags & MSG_NOTIFICATION) { |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 844 | msg.msg_control = incmsg; |
| 845 | msg.msg_controllen = sizeof(incmsg); |
| 846 | |
| 847 | process_sctp_notification(con, &msg, |
David Teigland | 617e82e | 2007-04-26 13:46:49 -0500 | [diff] [blame] | 848 | page_address(con->rx_page) + con->cb.base); |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 849 | mutex_unlock(&con->sock_mutex); |
| 850 | return 0; |
| 851 | } |
| 852 | BUG_ON(con->nodeid == 0); |
| 853 | |
| 854 | if (ret == len) |
| 855 | call_again_soon = 1; |
| 856 | cbuf_add(&con->cb, ret); |
| 857 | ret = dlm_process_incoming_buffer(con->nodeid, |
| 858 | page_address(con->rx_page), |
| 859 | con->cb.base, con->cb.len, |
| 860 | PAGE_CACHE_SIZE); |
| 861 | if (ret == -EBADMSG) { |
David Teigland | 617e82e | 2007-04-26 13:46:49 -0500 | [diff] [blame] | 862 | log_print("lowcomms: addr=%p, base=%u, len=%u, " |
| 863 | "iov_len=%u, iov_base[0]=%p, read=%d", |
| 864 | page_address(con->rx_page), con->cb.base, con->cb.len, |
| 865 | len, iov[0].iov_base, r); |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 866 | } |
| 867 | if (ret < 0) |
| 868 | goto out_close; |
| 869 | cbuf_eat(&con->cb, ret); |
| 870 | |
| 871 | if (cbuf_empty(&con->cb) && !call_again_soon) { |
| 872 | __free_page(con->rx_page); |
| 873 | con->rx_page = NULL; |
| 874 | } |
| 875 | |
| 876 | if (call_again_soon) |
| 877 | goto out_resched; |
| 878 | mutex_unlock(&con->sock_mutex); |
| 879 | return 0; |
| 880 | |
| 881 | out_resched: |
| 882 | if (!test_and_set_bit(CF_READ_PENDING, &con->flags)) |
| 883 | queue_work(recv_workqueue, &con->rwork); |
| 884 | mutex_unlock(&con->sock_mutex); |
| 885 | return -EAGAIN; |
| 886 | |
| 887 | out_close: |
| 888 | mutex_unlock(&con->sock_mutex); |
Patrick Caulfield | 9e5f282 | 2007-08-02 14:58:14 +0100 | [diff] [blame] | 889 | if (ret != -EAGAIN) { |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 890 | close_connection(con, false); |
| 891 | /* Reconnect when there is something to send */ |
| 892 | } |
| 893 | /* Don't return success if we really got EOF */ |
| 894 | if (ret == 0) |
| 895 | ret = -EAGAIN; |
| 896 | |
| 897 | return ret; |
| 898 | } |
| 899 | |
| 900 | /* Listening socket is busy, accept a connection */ |
| 901 | static int tcp_accept_from_sock(struct connection *con) |
| 902 | { |
| 903 | int result; |
| 904 | struct sockaddr_storage peeraddr; |
| 905 | struct socket *newsock; |
| 906 | int len; |
| 907 | int nodeid; |
| 908 | struct connection *newcon; |
| 909 | struct connection *addcon; |
| 910 | |
David Teigland | 513ef59 | 2012-03-30 11:46:08 -0500 | [diff] [blame] | 911 | mutex_lock(&connections_lock); |
| 912 | if (!dlm_allow_conn) { |
| 913 | mutex_unlock(&connections_lock); |
| 914 | return -1; |
| 915 | } |
| 916 | mutex_unlock(&connections_lock); |
| 917 | |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 918 | memset(&peeraddr, 0, sizeof(peeraddr)); |
| 919 | result = sock_create_kern(dlm_local_addr[0]->ss_family, SOCK_STREAM, |
| 920 | IPPROTO_TCP, &newsock); |
| 921 | if (result < 0) |
| 922 | return -ENOMEM; |
| 923 | |
| 924 | mutex_lock_nested(&con->sock_mutex, 0); |
| 925 | |
| 926 | result = -ENOTCONN; |
| 927 | if (con->sock == NULL) |
| 928 | goto accept_err; |
| 929 | |
| 930 | newsock->type = con->sock->type; |
| 931 | newsock->ops = con->sock->ops; |
| 932 | |
| 933 | result = con->sock->ops->accept(con->sock, newsock, O_NONBLOCK); |
| 934 | if (result < 0) |
| 935 | goto accept_err; |
| 936 | |
| 937 | /* Get the connected socket's peer */ |
| 938 | memset(&peeraddr, 0, sizeof(peeraddr)); |
| 939 | if (newsock->ops->getname(newsock, (struct sockaddr *)&peeraddr, |
| 940 | &len, 2)) { |
| 941 | result = -ECONNABORTED; |
| 942 | goto accept_err; |
| 943 | } |
| 944 | |
| 945 | /* Get the new node's NODEID */ |
| 946 | make_sockaddr(&peeraddr, 0, &len); |
David Teigland | 36b71a8 | 2012-07-26 12:44:30 -0500 | [diff] [blame] | 947 | if (addr_to_nodeid(&peeraddr, &nodeid)) { |
Masatake YAMATO | bcaadf5 | 2011-07-04 12:25:51 +0900 | [diff] [blame] | 948 | unsigned char *b=(unsigned char *)&peeraddr; |
David Teigland | 617e82e | 2007-04-26 13:46:49 -0500 | [diff] [blame] | 949 | log_print("connect from non cluster node"); |
Masatake YAMATO | bcaadf5 | 2011-07-04 12:25:51 +0900 | [diff] [blame] | 950 | print_hex_dump_bytes("ss: ", DUMP_PREFIX_NONE, |
| 951 | b, sizeof(struct sockaddr_storage)); |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 952 | sock_release(newsock); |
| 953 | mutex_unlock(&con->sock_mutex); |
| 954 | return -1; |
| 955 | } |
| 956 | |
| 957 | log_print("got connection from %d", nodeid); |
| 958 | |
| 959 | /* Check to see if we already have a connection to this node. This |
| 960 | * could happen if the two nodes initiate a connection at roughly |
| 961 | * the same time and the connections cross on the wire. |
| 962 | * In this case we store the incoming one in "othercon" |
| 963 | */ |
David Teigland | 748285c | 2009-05-15 10:50:57 -0500 | [diff] [blame] | 964 | newcon = nodeid2con(nodeid, GFP_NOFS); |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 965 | if (!newcon) { |
| 966 | result = -ENOMEM; |
| 967 | goto accept_err; |
| 968 | } |
| 969 | mutex_lock_nested(&newcon->sock_mutex, 1); |
| 970 | if (newcon->sock) { |
| 971 | struct connection *othercon = newcon->othercon; |
| 972 | |
| 973 | if (!othercon) { |
David Teigland | 748285c | 2009-05-15 10:50:57 -0500 | [diff] [blame] | 974 | othercon = kmem_cache_zalloc(con_cache, GFP_NOFS); |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 975 | if (!othercon) { |
David Teigland | 617e82e | 2007-04-26 13:46:49 -0500 | [diff] [blame] | 976 | log_print("failed to allocate incoming socket"); |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 977 | mutex_unlock(&newcon->sock_mutex); |
| 978 | result = -ENOMEM; |
| 979 | goto accept_err; |
| 980 | } |
| 981 | othercon->nodeid = nodeid; |
| 982 | othercon->rx_action = receive_from_sock; |
| 983 | mutex_init(&othercon->sock_mutex); |
| 984 | INIT_WORK(&othercon->swork, process_send_sockets); |
| 985 | INIT_WORK(&othercon->rwork, process_recv_sockets); |
| 986 | set_bit(CF_IS_OTHERCON, &othercon->flags); |
Patrick Caulfield | 61d96be | 2007-08-20 15:13:38 +0100 | [diff] [blame] | 987 | } |
| 988 | if (!othercon->sock) { |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 989 | newcon->othercon = othercon; |
Patrick Caulfield | 97d8483 | 2007-06-27 11:36:23 +0100 | [diff] [blame] | 990 | othercon->sock = newsock; |
| 991 | newsock->sk->sk_user_data = othercon; |
| 992 | add_sock(newsock, othercon); |
| 993 | addcon = othercon; |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 994 | } |
Patrick Caulfield | 97d8483 | 2007-06-27 11:36:23 +0100 | [diff] [blame] | 995 | else { |
| 996 | printk("Extra connection from node %d attempted\n", nodeid); |
| 997 | result = -EAGAIN; |
akpm@linux-foundation.org | f4fadb23c | 2007-06-27 14:43:37 -0700 | [diff] [blame] | 998 | mutex_unlock(&newcon->sock_mutex); |
Patrick Caulfield | 97d8483 | 2007-06-27 11:36:23 +0100 | [diff] [blame] | 999 | goto accept_err; |
| 1000 | } |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 1001 | } |
| 1002 | else { |
| 1003 | newsock->sk->sk_user_data = newcon; |
| 1004 | newcon->rx_action = receive_from_sock; |
| 1005 | add_sock(newsock, newcon); |
| 1006 | addcon = newcon; |
| 1007 | } |
| 1008 | |
| 1009 | mutex_unlock(&newcon->sock_mutex); |
| 1010 | |
| 1011 | /* |
| 1012 | * Add it to the active queue in case we got data |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 1013 | * between processing the accept adding the socket |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 1014 | * to the read_sockets list |
| 1015 | */ |
| 1016 | if (!test_and_set_bit(CF_READ_PENDING, &addcon->flags)) |
| 1017 | queue_work(recv_workqueue, &addcon->rwork); |
| 1018 | mutex_unlock(&con->sock_mutex); |
| 1019 | |
| 1020 | return 0; |
| 1021 | |
| 1022 | accept_err: |
| 1023 | mutex_unlock(&con->sock_mutex); |
| 1024 | sock_release(newsock); |
| 1025 | |
| 1026 | if (result != -EAGAIN) |
David Teigland | 617e82e | 2007-04-26 13:46:49 -0500 | [diff] [blame] | 1027 | log_print("error accepting connection from node: %d", result); |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 1028 | return result; |
| 1029 | } |
| 1030 | |
| 1031 | static void free_entry(struct writequeue_entry *e) |
| 1032 | { |
| 1033 | __free_page(e->page); |
| 1034 | kfree(e); |
| 1035 | } |
| 1036 | |
Mike Christie | 5d68987 | 2013-06-14 04:56:13 -0500 | [diff] [blame] | 1037 | /* |
| 1038 | * writequeue_entry_complete - try to delete and free write queue entry |
| 1039 | * @e: write queue entry to try to delete |
| 1040 | * @completed: bytes completed |
| 1041 | * |
| 1042 | * writequeue_lock must be held. |
| 1043 | */ |
| 1044 | static void writequeue_entry_complete(struct writequeue_entry *e, int completed) |
| 1045 | { |
| 1046 | e->offset += completed; |
| 1047 | e->len -= completed; |
| 1048 | |
| 1049 | if (e->len == 0 && e->users == 0) { |
| 1050 | list_del(&e->list); |
| 1051 | free_entry(e); |
| 1052 | } |
| 1053 | } |
| 1054 | |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 1055 | /* Initiate an SCTP association. |
| 1056 | This is a special case of send_to_sock() in that we don't yet have a |
| 1057 | peeled-off socket for this association, so we use the listening socket |
| 1058 | and add the primary IP address of the remote node. |
| 1059 | */ |
| 1060 | static void sctp_init_assoc(struct connection *con) |
| 1061 | { |
| 1062 | struct sockaddr_storage rem_addr; |
| 1063 | char outcmsg[CMSG_SPACE(sizeof(struct sctp_sndrcvinfo))]; |
| 1064 | struct msghdr outmessage; |
| 1065 | struct cmsghdr *cmsg; |
| 1066 | struct sctp_sndrcvinfo *sinfo; |
| 1067 | struct connection *base_con; |
| 1068 | struct writequeue_entry *e; |
| 1069 | int len, offset; |
| 1070 | int ret; |
| 1071 | int addrlen; |
| 1072 | struct kvec iov[1]; |
| 1073 | |
Mike Christie | 5d68987 | 2013-06-14 04:56:13 -0500 | [diff] [blame] | 1074 | mutex_lock(&con->sock_mutex); |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 1075 | if (test_and_set_bit(CF_INIT_PENDING, &con->flags)) |
Mike Christie | 5d68987 | 2013-06-14 04:56:13 -0500 | [diff] [blame] | 1076 | goto unlock; |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 1077 | |
Mike Christie | 98e1b60 | 2013-06-14 04:56:12 -0500 | [diff] [blame] | 1078 | if (nodeid_to_addr(con->nodeid, NULL, (struct sockaddr *)&rem_addr, |
| 1079 | con->try_new_addr)) { |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 1080 | log_print("no address for nodeid %d", con->nodeid); |
Mike Christie | 5d68987 | 2013-06-14 04:56:13 -0500 | [diff] [blame] | 1081 | goto unlock; |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 1082 | } |
| 1083 | base_con = nodeid2con(0, 0); |
| 1084 | BUG_ON(base_con == NULL); |
| 1085 | |
| 1086 | make_sockaddr(&rem_addr, dlm_config.ci_tcp_port, &addrlen); |
| 1087 | |
| 1088 | outmessage.msg_name = &rem_addr; |
| 1089 | outmessage.msg_namelen = addrlen; |
| 1090 | outmessage.msg_control = outcmsg; |
| 1091 | outmessage.msg_controllen = sizeof(outcmsg); |
| 1092 | outmessage.msg_flags = MSG_EOR; |
| 1093 | |
| 1094 | spin_lock(&con->writequeue_lock); |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 1095 | |
David Teigland | 04bedd7 | 2009-09-18 14:31:47 -0500 | [diff] [blame] | 1096 | if (list_empty(&con->writequeue)) { |
| 1097 | spin_unlock(&con->writequeue_lock); |
| 1098 | log_print("writequeue empty for nodeid %d", con->nodeid); |
Mike Christie | 5d68987 | 2013-06-14 04:56:13 -0500 | [diff] [blame] | 1099 | goto unlock; |
David Teigland | 04bedd7 | 2009-09-18 14:31:47 -0500 | [diff] [blame] | 1100 | } |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 1101 | |
David Teigland | 04bedd7 | 2009-09-18 14:31:47 -0500 | [diff] [blame] | 1102 | e = list_first_entry(&con->writequeue, struct writequeue_entry, list); |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 1103 | len = e->len; |
| 1104 | offset = e->offset; |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 1105 | |
| 1106 | /* Send the first block off the write queue */ |
| 1107 | iov[0].iov_base = page_address(e->page)+offset; |
| 1108 | iov[0].iov_len = len; |
Mike Christie | 5d68987 | 2013-06-14 04:56:13 -0500 | [diff] [blame] | 1109 | spin_unlock(&con->writequeue_lock); |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 1110 | |
Mike Christie | 98e1b60 | 2013-06-14 04:56:12 -0500 | [diff] [blame] | 1111 | if (rem_addr.ss_family == AF_INET) { |
| 1112 | struct sockaddr_in *sin = (struct sockaddr_in *)&rem_addr; |
| 1113 | log_print("Trying to connect to %pI4", &sin->sin_addr.s_addr); |
| 1114 | } else { |
| 1115 | struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&rem_addr; |
| 1116 | log_print("Trying to connect to %pI6", &sin6->sin6_addr); |
| 1117 | } |
| 1118 | |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 1119 | cmsg = CMSG_FIRSTHDR(&outmessage); |
| 1120 | cmsg->cmsg_level = IPPROTO_SCTP; |
| 1121 | cmsg->cmsg_type = SCTP_SNDRCV; |
| 1122 | cmsg->cmsg_len = CMSG_LEN(sizeof(struct sctp_sndrcvinfo)); |
| 1123 | sinfo = CMSG_DATA(cmsg); |
| 1124 | memset(sinfo, 0x00, sizeof(struct sctp_sndrcvinfo)); |
Mike Christie | 5d68987 | 2013-06-14 04:56:13 -0500 | [diff] [blame] | 1125 | sinfo->sinfo_ppid = cpu_to_le32(con->nodeid); |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 1126 | outmessage.msg_controllen = cmsg->cmsg_len; |
Mike Christie | 98e1b60 | 2013-06-14 04:56:12 -0500 | [diff] [blame] | 1127 | sinfo->sinfo_flags |= SCTP_ADDR_OVER; |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 1128 | |
| 1129 | ret = kernel_sendmsg(base_con->sock, &outmessage, iov, 1, len); |
| 1130 | if (ret < 0) { |
David Teigland | 617e82e | 2007-04-26 13:46:49 -0500 | [diff] [blame] | 1131 | log_print("Send first packet to node %d failed: %d", |
| 1132 | con->nodeid, ret); |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 1133 | |
| 1134 | /* Try again later */ |
| 1135 | clear_bit(CF_CONNECT_PENDING, &con->flags); |
| 1136 | clear_bit(CF_INIT_PENDING, &con->flags); |
| 1137 | } |
| 1138 | else { |
| 1139 | spin_lock(&con->writequeue_lock); |
Mike Christie | 5d68987 | 2013-06-14 04:56:13 -0500 | [diff] [blame] | 1140 | writequeue_entry_complete(e, ret); |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 1141 | spin_unlock(&con->writequeue_lock); |
| 1142 | } |
Mike Christie | 5d68987 | 2013-06-14 04:56:13 -0500 | [diff] [blame] | 1143 | |
| 1144 | unlock: |
| 1145 | mutex_unlock(&con->sock_mutex); |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 1146 | } |
| 1147 | |
| 1148 | /* Connect a new socket to its peer */ |
| 1149 | static void tcp_connect_to_sock(struct connection *con) |
| 1150 | { |
Lon Hohberger | 6bd8fed | 2007-10-25 18:51:54 -0400 | [diff] [blame] | 1151 | struct sockaddr_storage saddr, src_addr; |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 1152 | int addr_len; |
Casey Dahlin | a89d63a | 2009-07-14 12:17:51 -0500 | [diff] [blame] | 1153 | struct socket *sock = NULL; |
David Teigland | cb2d45d | 2010-11-12 11:12:55 -0600 | [diff] [blame] | 1154 | int one = 1; |
David Teigland | 36b71a8 | 2012-07-26 12:44:30 -0500 | [diff] [blame] | 1155 | int result; |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 1156 | |
| 1157 | if (con->nodeid == 0) { |
| 1158 | log_print("attempt to connect sock 0 foiled"); |
| 1159 | return; |
| 1160 | } |
| 1161 | |
| 1162 | mutex_lock(&con->sock_mutex); |
| 1163 | if (con->retries++ > MAX_CONNECT_RETRIES) |
| 1164 | goto out; |
| 1165 | |
| 1166 | /* Some odd races can cause double-connects, ignore them */ |
David Teigland | 36b71a8 | 2012-07-26 12:44:30 -0500 | [diff] [blame] | 1167 | if (con->sock) |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 1168 | goto out; |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 1169 | |
| 1170 | /* Create a socket to communicate with */ |
| 1171 | result = sock_create_kern(dlm_local_addr[0]->ss_family, SOCK_STREAM, |
| 1172 | IPPROTO_TCP, &sock); |
| 1173 | if (result < 0) |
| 1174 | goto out_err; |
| 1175 | |
| 1176 | memset(&saddr, 0, sizeof(saddr)); |
Mike Christie | 98e1b60 | 2013-06-14 04:56:12 -0500 | [diff] [blame] | 1177 | result = nodeid_to_addr(con->nodeid, &saddr, NULL, false); |
David Teigland | 36b71a8 | 2012-07-26 12:44:30 -0500 | [diff] [blame] | 1178 | if (result < 0) { |
| 1179 | log_print("no address for nodeid %d", con->nodeid); |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 1180 | goto out_err; |
David Teigland | 36b71a8 | 2012-07-26 12:44:30 -0500 | [diff] [blame] | 1181 | } |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 1182 | |
| 1183 | sock->sk->sk_user_data = con; |
| 1184 | con->rx_action = receive_from_sock; |
| 1185 | con->connect_action = tcp_connect_to_sock; |
| 1186 | add_sock(sock, con); |
| 1187 | |
Lon Hohberger | 6bd8fed | 2007-10-25 18:51:54 -0400 | [diff] [blame] | 1188 | /* Bind to our cluster-known address connecting to avoid |
| 1189 | routing problems */ |
| 1190 | memcpy(&src_addr, dlm_local_addr[0], sizeof(src_addr)); |
| 1191 | make_sockaddr(&src_addr, 0, &addr_len); |
| 1192 | result = sock->ops->bind(sock, (struct sockaddr *) &src_addr, |
| 1193 | addr_len); |
| 1194 | if (result < 0) { |
| 1195 | log_print("could not bind for connect: %d", result); |
| 1196 | /* This *may* not indicate a critical error */ |
| 1197 | } |
| 1198 | |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 1199 | make_sockaddr(&saddr, dlm_config.ci_tcp_port, &addr_len); |
| 1200 | |
| 1201 | log_print("connecting to %d", con->nodeid); |
David Teigland | cb2d45d | 2010-11-12 11:12:55 -0600 | [diff] [blame] | 1202 | |
| 1203 | /* Turn off Nagle's algorithm */ |
| 1204 | kernel_setsockopt(sock, SOL_TCP, TCP_NODELAY, (char *)&one, |
| 1205 | sizeof(one)); |
| 1206 | |
David Teigland | 36b71a8 | 2012-07-26 12:44:30 -0500 | [diff] [blame] | 1207 | result = sock->ops->connect(sock, (struct sockaddr *)&saddr, addr_len, |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 1208 | O_NONBLOCK); |
| 1209 | if (result == -EINPROGRESS) |
| 1210 | result = 0; |
| 1211 | if (result == 0) |
| 1212 | goto out; |
| 1213 | |
| 1214 | out_err: |
| 1215 | if (con->sock) { |
| 1216 | sock_release(con->sock); |
| 1217 | con->sock = NULL; |
Casey Dahlin | a89d63a | 2009-07-14 12:17:51 -0500 | [diff] [blame] | 1218 | } else if (sock) { |
| 1219 | sock_release(sock); |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 1220 | } |
| 1221 | /* |
| 1222 | * Some errors are fatal and this list might need adjusting. For other |
| 1223 | * errors we try again until the max number of retries is reached. |
| 1224 | */ |
David Teigland | 36b71a8 | 2012-07-26 12:44:30 -0500 | [diff] [blame] | 1225 | if (result != -EHOSTUNREACH && |
| 1226 | result != -ENETUNREACH && |
| 1227 | result != -ENETDOWN && |
| 1228 | result != -EINVAL && |
| 1229 | result != -EPROTONOSUPPORT) { |
| 1230 | log_print("connect %d try %d error %d", con->nodeid, |
| 1231 | con->retries, result); |
| 1232 | mutex_unlock(&con->sock_mutex); |
| 1233 | msleep(1000); |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 1234 | lowcomms_connect_sock(con); |
David Teigland | 36b71a8 | 2012-07-26 12:44:30 -0500 | [diff] [blame] | 1235 | return; |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 1236 | } |
| 1237 | out: |
| 1238 | mutex_unlock(&con->sock_mutex); |
| 1239 | return; |
| 1240 | } |
| 1241 | |
| 1242 | static struct socket *tcp_create_listen_sock(struct connection *con, |
| 1243 | struct sockaddr_storage *saddr) |
| 1244 | { |
| 1245 | struct socket *sock = NULL; |
| 1246 | int result = 0; |
| 1247 | int one = 1; |
| 1248 | int addr_len; |
| 1249 | |
| 1250 | if (dlm_local_addr[0]->ss_family == AF_INET) |
| 1251 | addr_len = sizeof(struct sockaddr_in); |
| 1252 | else |
| 1253 | addr_len = sizeof(struct sockaddr_in6); |
| 1254 | |
| 1255 | /* Create a socket to communicate with */ |
David Teigland | 617e82e | 2007-04-26 13:46:49 -0500 | [diff] [blame] | 1256 | result = sock_create_kern(dlm_local_addr[0]->ss_family, SOCK_STREAM, |
| 1257 | IPPROTO_TCP, &sock); |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 1258 | if (result < 0) { |
David Teigland | 617e82e | 2007-04-26 13:46:49 -0500 | [diff] [blame] | 1259 | log_print("Can't create listening comms socket"); |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 1260 | goto create_out; |
| 1261 | } |
| 1262 | |
David Teigland | cb2d45d | 2010-11-12 11:12:55 -0600 | [diff] [blame] | 1263 | /* Turn off Nagle's algorithm */ |
| 1264 | kernel_setsockopt(sock, SOL_TCP, TCP_NODELAY, (char *)&one, |
| 1265 | sizeof(one)); |
| 1266 | |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 1267 | result = kernel_setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, |
| 1268 | (char *)&one, sizeof(one)); |
| 1269 | |
| 1270 | if (result < 0) { |
David Teigland | 617e82e | 2007-04-26 13:46:49 -0500 | [diff] [blame] | 1271 | log_print("Failed to set SO_REUSEADDR on socket: %d", result); |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 1272 | } |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 1273 | con->rx_action = tcp_accept_from_sock; |
| 1274 | con->connect_action = tcp_connect_to_sock; |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 1275 | |
| 1276 | /* Bind to our port */ |
| 1277 | make_sockaddr(saddr, dlm_config.ci_tcp_port, &addr_len); |
| 1278 | result = sock->ops->bind(sock, (struct sockaddr *) saddr, addr_len); |
| 1279 | if (result < 0) { |
David Teigland | 617e82e | 2007-04-26 13:46:49 -0500 | [diff] [blame] | 1280 | log_print("Can't bind to port %d", dlm_config.ci_tcp_port); |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 1281 | sock_release(sock); |
| 1282 | sock = NULL; |
| 1283 | con->sock = NULL; |
| 1284 | goto create_out; |
| 1285 | } |
| 1286 | result = kernel_setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE, |
| 1287 | (char *)&one, sizeof(one)); |
| 1288 | if (result < 0) { |
David Teigland | 617e82e | 2007-04-26 13:46:49 -0500 | [diff] [blame] | 1289 | log_print("Set keepalive failed: %d", result); |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 1290 | } |
| 1291 | |
| 1292 | result = sock->ops->listen(sock, 5); |
| 1293 | if (result < 0) { |
David Teigland | 617e82e | 2007-04-26 13:46:49 -0500 | [diff] [blame] | 1294 | log_print("Can't listen on port %d", dlm_config.ci_tcp_port); |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 1295 | sock_release(sock); |
| 1296 | sock = NULL; |
| 1297 | goto create_out; |
| 1298 | } |
| 1299 | |
| 1300 | create_out: |
| 1301 | return sock; |
| 1302 | } |
| 1303 | |
| 1304 | /* Get local addresses */ |
| 1305 | static void init_local(void) |
| 1306 | { |
| 1307 | struct sockaddr_storage sas, *addr; |
| 1308 | int i; |
| 1309 | |
Patrick Caulfield | 30d3a23 | 2007-04-23 16:26:21 +0100 | [diff] [blame] | 1310 | dlm_local_count = 0; |
David Teigland | 1b189b8 | 2012-03-21 09:18:34 -0500 | [diff] [blame] | 1311 | for (i = 0; i < DLM_MAX_ADDR_COUNT; i++) { |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 1312 | if (dlm_our_addr(&sas, i)) |
| 1313 | break; |
| 1314 | |
David Teigland | 573c24c | 2009-11-30 16:34:43 -0600 | [diff] [blame] | 1315 | addr = kmalloc(sizeof(*addr), GFP_NOFS); |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 1316 | if (!addr) |
| 1317 | break; |
| 1318 | memcpy(addr, &sas, sizeof(*addr)); |
| 1319 | dlm_local_addr[dlm_local_count++] = addr; |
| 1320 | } |
| 1321 | } |
| 1322 | |
David Teigland | 617e82e | 2007-04-26 13:46:49 -0500 | [diff] [blame] | 1323 | /* Bind to an IP address. SCTP allows multiple address so it can do |
| 1324 | multi-homing */ |
| 1325 | static int add_sctp_bind_addr(struct connection *sctp_con, |
| 1326 | struct sockaddr_storage *addr, |
| 1327 | int addr_len, int num) |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 1328 | { |
| 1329 | int result = 0; |
| 1330 | |
| 1331 | if (num == 1) |
| 1332 | result = kernel_bind(sctp_con->sock, |
| 1333 | (struct sockaddr *) addr, |
| 1334 | addr_len); |
| 1335 | else |
| 1336 | result = kernel_setsockopt(sctp_con->sock, SOL_SCTP, |
| 1337 | SCTP_SOCKOPT_BINDX_ADD, |
| 1338 | (char *)addr, addr_len); |
| 1339 | |
| 1340 | if (result < 0) |
| 1341 | log_print("Can't bind to port %d addr number %d", |
| 1342 | dlm_config.ci_tcp_port, num); |
| 1343 | |
| 1344 | return result; |
| 1345 | } |
| 1346 | |
| 1347 | /* Initialise SCTP socket and bind to all interfaces */ |
| 1348 | static int sctp_listen_for_all(void) |
| 1349 | { |
| 1350 | struct socket *sock = NULL; |
| 1351 | struct sockaddr_storage localaddr; |
| 1352 | struct sctp_event_subscribe subscribe; |
| 1353 | int result = -EINVAL, num = 1, i, addr_len; |
David Teigland | 573c24c | 2009-11-30 16:34:43 -0600 | [diff] [blame] | 1354 | struct connection *con = nodeid2con(0, GFP_NOFS); |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 1355 | int bufsize = NEEDED_RMEM; |
Mike Christie | 86e92ad | 2013-06-14 04:56:14 -0500 | [diff] [blame] | 1356 | int one = 1; |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 1357 | |
| 1358 | if (!con) |
| 1359 | return -ENOMEM; |
| 1360 | |
| 1361 | log_print("Using SCTP for communications"); |
| 1362 | |
| 1363 | result = sock_create_kern(dlm_local_addr[0]->ss_family, SOCK_SEQPACKET, |
| 1364 | IPPROTO_SCTP, &sock); |
| 1365 | if (result < 0) { |
| 1366 | log_print("Can't create comms socket, check SCTP is loaded"); |
| 1367 | goto out; |
| 1368 | } |
| 1369 | |
| 1370 | /* Listen for events */ |
| 1371 | memset(&subscribe, 0, sizeof(subscribe)); |
| 1372 | subscribe.sctp_data_io_event = 1; |
| 1373 | subscribe.sctp_association_event = 1; |
| 1374 | subscribe.sctp_send_failure_event = 1; |
| 1375 | subscribe.sctp_shutdown_event = 1; |
| 1376 | subscribe.sctp_partial_delivery_event = 1; |
| 1377 | |
David S. Miller | df61c95 | 2007-11-06 23:48:57 -0800 | [diff] [blame] | 1378 | result = kernel_setsockopt(sock, SOL_SOCKET, SO_RCVBUFFORCE, |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 1379 | (char *)&bufsize, sizeof(bufsize)); |
| 1380 | if (result) |
David Teigland | 617e82e | 2007-04-26 13:46:49 -0500 | [diff] [blame] | 1381 | log_print("Error increasing buffer space on socket %d", result); |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 1382 | |
| 1383 | result = kernel_setsockopt(sock, SOL_SCTP, SCTP_EVENTS, |
David Teigland | 617e82e | 2007-04-26 13:46:49 -0500 | [diff] [blame] | 1384 | (char *)&subscribe, sizeof(subscribe)); |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 1385 | if (result < 0) { |
| 1386 | log_print("Failed to set SCTP_EVENTS on socket: result=%d", |
| 1387 | result); |
| 1388 | goto create_delsock; |
| 1389 | } |
| 1390 | |
Mike Christie | 86e92ad | 2013-06-14 04:56:14 -0500 | [diff] [blame] | 1391 | result = kernel_setsockopt(sock, SOL_SCTP, SCTP_NODELAY, (char *)&one, |
| 1392 | sizeof(one)); |
| 1393 | if (result < 0) |
| 1394 | log_print("Could not set SCTP NODELAY error %d\n", result); |
| 1395 | |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 1396 | /* Init con struct */ |
| 1397 | sock->sk->sk_user_data = con; |
| 1398 | con->sock = sock; |
| 1399 | con->sock->sk->sk_data_ready = lowcomms_data_ready; |
| 1400 | con->rx_action = receive_from_sock; |
| 1401 | con->connect_action = sctp_init_assoc; |
| 1402 | |
| 1403 | /* Bind to all interfaces. */ |
| 1404 | for (i = 0; i < dlm_local_count; i++) { |
| 1405 | memcpy(&localaddr, dlm_local_addr[i], sizeof(localaddr)); |
| 1406 | make_sockaddr(&localaddr, dlm_config.ci_tcp_port, &addr_len); |
| 1407 | |
| 1408 | result = add_sctp_bind_addr(con, &localaddr, addr_len, num); |
| 1409 | if (result) |
| 1410 | goto create_delsock; |
| 1411 | ++num; |
| 1412 | } |
| 1413 | |
| 1414 | result = sock->ops->listen(sock, 5); |
| 1415 | if (result < 0) { |
| 1416 | log_print("Can't set socket listening"); |
| 1417 | goto create_delsock; |
| 1418 | } |
| 1419 | |
| 1420 | return 0; |
| 1421 | |
| 1422 | create_delsock: |
| 1423 | sock_release(sock); |
| 1424 | con->sock = NULL; |
| 1425 | out: |
| 1426 | return result; |
| 1427 | } |
| 1428 | |
| 1429 | static int tcp_listen_for_all(void) |
| 1430 | { |
| 1431 | struct socket *sock = NULL; |
David Teigland | 573c24c | 2009-11-30 16:34:43 -0600 | [diff] [blame] | 1432 | struct connection *con = nodeid2con(0, GFP_NOFS); |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 1433 | int result = -EINVAL; |
| 1434 | |
| 1435 | if (!con) |
| 1436 | return -ENOMEM; |
| 1437 | |
| 1438 | /* We don't support multi-homed hosts */ |
| 1439 | if (dlm_local_addr[1] != NULL) { |
David Teigland | 617e82e | 2007-04-26 13:46:49 -0500 | [diff] [blame] | 1440 | log_print("TCP protocol can't handle multi-homed hosts, " |
| 1441 | "try SCTP"); |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 1442 | return -EINVAL; |
| 1443 | } |
| 1444 | |
| 1445 | log_print("Using TCP for communications"); |
| 1446 | |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 1447 | sock = tcp_create_listen_sock(con, dlm_local_addr[0]); |
| 1448 | if (sock) { |
| 1449 | add_sock(sock, con); |
| 1450 | result = 0; |
| 1451 | } |
| 1452 | else { |
| 1453 | result = -EADDRINUSE; |
| 1454 | } |
| 1455 | |
| 1456 | return result; |
| 1457 | } |
| 1458 | |
| 1459 | |
| 1460 | |
| 1461 | static struct writequeue_entry *new_writequeue_entry(struct connection *con, |
| 1462 | gfp_t allocation) |
| 1463 | { |
| 1464 | struct writequeue_entry *entry; |
| 1465 | |
| 1466 | entry = kmalloc(sizeof(struct writequeue_entry), allocation); |
| 1467 | if (!entry) |
| 1468 | return NULL; |
| 1469 | |
| 1470 | entry->page = alloc_page(allocation); |
| 1471 | if (!entry->page) { |
| 1472 | kfree(entry); |
| 1473 | return NULL; |
| 1474 | } |
| 1475 | |
| 1476 | entry->offset = 0; |
| 1477 | entry->len = 0; |
| 1478 | entry->end = 0; |
| 1479 | entry->users = 0; |
| 1480 | entry->con = con; |
| 1481 | |
| 1482 | return entry; |
| 1483 | } |
| 1484 | |
David Teigland | 617e82e | 2007-04-26 13:46:49 -0500 | [diff] [blame] | 1485 | void *dlm_lowcomms_get_buffer(int nodeid, int len, gfp_t allocation, char **ppc) |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 1486 | { |
| 1487 | struct connection *con; |
| 1488 | struct writequeue_entry *e; |
| 1489 | int offset = 0; |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 1490 | |
| 1491 | con = nodeid2con(nodeid, allocation); |
| 1492 | if (!con) |
| 1493 | return NULL; |
| 1494 | |
| 1495 | spin_lock(&con->writequeue_lock); |
| 1496 | e = list_entry(con->writequeue.prev, struct writequeue_entry, list); |
| 1497 | if ((&e->list == &con->writequeue) || |
| 1498 | (PAGE_CACHE_SIZE - e->end < len)) { |
| 1499 | e = NULL; |
| 1500 | } else { |
| 1501 | offset = e->end; |
| 1502 | e->end += len; |
Wei Yongjun | eeee2b5 | 2012-10-18 22:57:19 +0800 | [diff] [blame] | 1503 | e->users++; |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 1504 | } |
| 1505 | spin_unlock(&con->writequeue_lock); |
| 1506 | |
| 1507 | if (e) { |
| 1508 | got_one: |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 1509 | *ppc = page_address(e->page) + offset; |
| 1510 | return e; |
| 1511 | } |
| 1512 | |
| 1513 | e = new_writequeue_entry(con, allocation); |
| 1514 | if (e) { |
| 1515 | spin_lock(&con->writequeue_lock); |
| 1516 | offset = e->end; |
| 1517 | e->end += len; |
Wei Yongjun | eeee2b5 | 2012-10-18 22:57:19 +0800 | [diff] [blame] | 1518 | e->users++; |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 1519 | list_add_tail(&e->list, &con->writequeue); |
| 1520 | spin_unlock(&con->writequeue_lock); |
| 1521 | goto got_one; |
| 1522 | } |
| 1523 | return NULL; |
| 1524 | } |
| 1525 | |
| 1526 | void dlm_lowcomms_commit_buffer(void *mh) |
| 1527 | { |
| 1528 | struct writequeue_entry *e = (struct writequeue_entry *)mh; |
| 1529 | struct connection *con = e->con; |
| 1530 | int users; |
| 1531 | |
| 1532 | spin_lock(&con->writequeue_lock); |
| 1533 | users = --e->users; |
| 1534 | if (users) |
| 1535 | goto out; |
| 1536 | e->len = e->end - e->offset; |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 1537 | spin_unlock(&con->writequeue_lock); |
| 1538 | |
| 1539 | if (!test_and_set_bit(CF_WRITE_PENDING, &con->flags)) { |
| 1540 | queue_work(send_workqueue, &con->swork); |
| 1541 | } |
| 1542 | return; |
| 1543 | |
| 1544 | out: |
| 1545 | spin_unlock(&con->writequeue_lock); |
| 1546 | return; |
| 1547 | } |
| 1548 | |
| 1549 | /* Send a message */ |
| 1550 | static void send_to_sock(struct connection *con) |
| 1551 | { |
| 1552 | int ret = 0; |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 1553 | const int msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL; |
| 1554 | struct writequeue_entry *e; |
| 1555 | int len, offset; |
Bob Peterson | f92c8dd | 2010-11-12 11:15:20 -0600 | [diff] [blame] | 1556 | int count = 0; |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 1557 | |
| 1558 | mutex_lock(&con->sock_mutex); |
| 1559 | if (con->sock == NULL) |
| 1560 | goto out_connect; |
| 1561 | |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 1562 | spin_lock(&con->writequeue_lock); |
| 1563 | for (;;) { |
| 1564 | e = list_entry(con->writequeue.next, struct writequeue_entry, |
| 1565 | list); |
| 1566 | if ((struct list_head *) e == &con->writequeue) |
| 1567 | break; |
| 1568 | |
| 1569 | len = e->len; |
| 1570 | offset = e->offset; |
| 1571 | BUG_ON(len == 0 && e->users == 0); |
| 1572 | spin_unlock(&con->writequeue_lock); |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 1573 | |
| 1574 | ret = 0; |
| 1575 | if (len) { |
Paolo Bonzini | 1329e3f | 2009-08-24 13:18:04 -0500 | [diff] [blame] | 1576 | ret = kernel_sendpage(con->sock, e->page, offset, len, |
| 1577 | msg_flags); |
Patrick Caulfield | d66f827 | 2007-09-14 08:49:21 +0100 | [diff] [blame] | 1578 | if (ret == -EAGAIN || ret == 0) { |
David Miller | b36930d | 2010-11-10 21:56:39 -0800 | [diff] [blame] | 1579 | if (ret == -EAGAIN && |
| 1580 | test_bit(SOCK_ASYNC_NOSPACE, &con->sock->flags) && |
| 1581 | !test_and_set_bit(CF_APP_LIMITED, &con->flags)) { |
| 1582 | /* Notify TCP that we're limited by the |
| 1583 | * application window size. |
| 1584 | */ |
| 1585 | set_bit(SOCK_NOSPACE, &con->sock->flags); |
| 1586 | con->sock->sk->sk_write_pending++; |
| 1587 | } |
Patrick Caulfield | d66f827 | 2007-09-14 08:49:21 +0100 | [diff] [blame] | 1588 | cond_resched(); |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 1589 | goto out; |
Ying Xue | 9c5bef5 | 2012-08-13 14:29:55 +0800 | [diff] [blame] | 1590 | } else if (ret < 0) |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 1591 | goto send_error; |
Patrick Caulfield | d66f827 | 2007-09-14 08:49:21 +0100 | [diff] [blame] | 1592 | } |
Bob Peterson | f92c8dd | 2010-11-12 11:15:20 -0600 | [diff] [blame] | 1593 | |
| 1594 | /* Don't starve people filling buffers */ |
| 1595 | if (++count >= MAX_SEND_MSG_COUNT) { |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 1596 | cond_resched(); |
Bob Peterson | f92c8dd | 2010-11-12 11:15:20 -0600 | [diff] [blame] | 1597 | count = 0; |
| 1598 | } |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 1599 | |
| 1600 | spin_lock(&con->writequeue_lock); |
Mike Christie | 5d68987 | 2013-06-14 04:56:13 -0500 | [diff] [blame] | 1601 | writequeue_entry_complete(e, ret); |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 1602 | } |
| 1603 | spin_unlock(&con->writequeue_lock); |
| 1604 | out: |
| 1605 | mutex_unlock(&con->sock_mutex); |
| 1606 | return; |
| 1607 | |
| 1608 | send_error: |
| 1609 | mutex_unlock(&con->sock_mutex); |
| 1610 | close_connection(con, false); |
| 1611 | lowcomms_connect_sock(con); |
| 1612 | return; |
| 1613 | |
| 1614 | out_connect: |
| 1615 | mutex_unlock(&con->sock_mutex); |
| 1616 | if (!test_bit(CF_INIT_PENDING, &con->flags)) |
| 1617 | lowcomms_connect_sock(con); |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 1618 | } |
| 1619 | |
| 1620 | static void clean_one_writequeue(struct connection *con) |
| 1621 | { |
Christine Caulfield | 5e9ccc3 | 2009-01-28 12:57:40 -0600 | [diff] [blame] | 1622 | struct writequeue_entry *e, *safe; |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 1623 | |
| 1624 | spin_lock(&con->writequeue_lock); |
Christine Caulfield | 5e9ccc3 | 2009-01-28 12:57:40 -0600 | [diff] [blame] | 1625 | list_for_each_entry_safe(e, safe, &con->writequeue, list) { |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 1626 | list_del(&e->list); |
| 1627 | free_entry(e); |
| 1628 | } |
| 1629 | spin_unlock(&con->writequeue_lock); |
| 1630 | } |
| 1631 | |
| 1632 | /* Called from recovery when it knows that a node has |
| 1633 | left the cluster */ |
| 1634 | int dlm_lowcomms_close(int nodeid) |
| 1635 | { |
| 1636 | struct connection *con; |
David Teigland | 36b71a8 | 2012-07-26 12:44:30 -0500 | [diff] [blame] | 1637 | struct dlm_node_addr *na; |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 1638 | |
| 1639 | log_print("closing connection to node %d", nodeid); |
| 1640 | con = nodeid2con(nodeid, 0); |
| 1641 | if (con) { |
Lars Marowsky-Bree | 063c4c9 | 2009-08-11 16:18:23 -0500 | [diff] [blame] | 1642 | clear_bit(CF_CONNECT_PENDING, &con->flags); |
| 1643 | clear_bit(CF_WRITE_PENDING, &con->flags); |
| 1644 | set_bit(CF_CLOSE, &con->flags); |
| 1645 | if (cancel_work_sync(&con->swork)) |
| 1646 | log_print("canceled swork for node %d", nodeid); |
| 1647 | if (cancel_work_sync(&con->rwork)) |
| 1648 | log_print("canceled rwork for node %d", nodeid); |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 1649 | clean_one_writequeue(con); |
| 1650 | close_connection(con, true); |
| 1651 | } |
David Teigland | 36b71a8 | 2012-07-26 12:44:30 -0500 | [diff] [blame] | 1652 | |
| 1653 | spin_lock(&dlm_node_addrs_spin); |
| 1654 | na = find_node_addr(nodeid); |
| 1655 | if (na) { |
| 1656 | list_del(&na->list); |
| 1657 | while (na->addr_count--) |
| 1658 | kfree(na->addr[na->addr_count]); |
| 1659 | kfree(na); |
| 1660 | } |
| 1661 | spin_unlock(&dlm_node_addrs_spin); |
| 1662 | |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 1663 | return 0; |
| 1664 | } |
| 1665 | |
| 1666 | /* Receive workqueue function */ |
| 1667 | static void process_recv_sockets(struct work_struct *work) |
| 1668 | { |
| 1669 | struct connection *con = container_of(work, struct connection, rwork); |
| 1670 | int err; |
| 1671 | |
| 1672 | clear_bit(CF_READ_PENDING, &con->flags); |
| 1673 | do { |
| 1674 | err = con->rx_action(con); |
| 1675 | } while (!err); |
| 1676 | } |
| 1677 | |
| 1678 | /* Send workqueue function */ |
| 1679 | static void process_send_sockets(struct work_struct *work) |
| 1680 | { |
| 1681 | struct connection *con = container_of(work, struct connection, swork); |
| 1682 | |
| 1683 | if (test_and_clear_bit(CF_CONNECT_PENDING, &con->flags)) { |
| 1684 | con->connect_action(con); |
Lars Marowsky-Bree | 063c4c9 | 2009-08-11 16:18:23 -0500 | [diff] [blame] | 1685 | set_bit(CF_WRITE_PENDING, &con->flags); |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 1686 | } |
Lars Marowsky-Bree | 063c4c9 | 2009-08-11 16:18:23 -0500 | [diff] [blame] | 1687 | if (test_and_clear_bit(CF_WRITE_PENDING, &con->flags)) |
| 1688 | send_to_sock(con); |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 1689 | } |
| 1690 | |
| 1691 | |
| 1692 | /* Discard all entries on the write queues */ |
| 1693 | static void clean_writequeues(void) |
| 1694 | { |
Christine Caulfield | 5e9ccc3 | 2009-01-28 12:57:40 -0600 | [diff] [blame] | 1695 | foreach_conn(clean_one_writequeue); |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 1696 | } |
| 1697 | |
| 1698 | static void work_stop(void) |
| 1699 | { |
| 1700 | destroy_workqueue(recv_workqueue); |
| 1701 | destroy_workqueue(send_workqueue); |
| 1702 | } |
| 1703 | |
| 1704 | static int work_start(void) |
| 1705 | { |
David Teigland | e43f055 | 2011-03-10 13:22:34 -0600 | [diff] [blame] | 1706 | recv_workqueue = alloc_workqueue("dlm_recv", |
| 1707 | WQ_UNBOUND | WQ_MEM_RECLAIM, 1); |
Namhyung Kim | b9d4105 | 2010-12-13 13:42:24 -0600 | [diff] [blame] | 1708 | if (!recv_workqueue) { |
| 1709 | log_print("can't start dlm_recv"); |
| 1710 | return -ENOMEM; |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 1711 | } |
| 1712 | |
David Teigland | e43f055 | 2011-03-10 13:22:34 -0600 | [diff] [blame] | 1713 | send_workqueue = alloc_workqueue("dlm_send", |
| 1714 | WQ_UNBOUND | WQ_MEM_RECLAIM, 1); |
Namhyung Kim | b9d4105 | 2010-12-13 13:42:24 -0600 | [diff] [blame] | 1715 | if (!send_workqueue) { |
| 1716 | log_print("can't start dlm_send"); |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 1717 | destroy_workqueue(recv_workqueue); |
Namhyung Kim | b9d4105 | 2010-12-13 13:42:24 -0600 | [diff] [blame] | 1718 | return -ENOMEM; |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 1719 | } |
| 1720 | |
| 1721 | return 0; |
| 1722 | } |
| 1723 | |
Christine Caulfield | 5e9ccc3 | 2009-01-28 12:57:40 -0600 | [diff] [blame] | 1724 | static void stop_conn(struct connection *con) |
| 1725 | { |
| 1726 | con->flags |= 0x0F; |
Christine Caulfield | 391fbdc | 2009-05-07 10:54:16 -0500 | [diff] [blame] | 1727 | if (con->sock && con->sock->sk) |
Christine Caulfield | 5e9ccc3 | 2009-01-28 12:57:40 -0600 | [diff] [blame] | 1728 | con->sock->sk->sk_user_data = NULL; |
| 1729 | } |
| 1730 | |
| 1731 | static void free_conn(struct connection *con) |
| 1732 | { |
| 1733 | close_connection(con, true); |
| 1734 | if (con->othercon) |
| 1735 | kmem_cache_free(con_cache, con->othercon); |
| 1736 | hlist_del(&con->list); |
| 1737 | kmem_cache_free(con_cache, con); |
| 1738 | } |
| 1739 | |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 1740 | void dlm_lowcomms_stop(void) |
| 1741 | { |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 1742 | /* Set all the flags to prevent any |
| 1743 | socket activity. |
| 1744 | */ |
Matthias Kaehlcke | 7a936ce | 2008-05-12 10:04:51 -0500 | [diff] [blame] | 1745 | mutex_lock(&connections_lock); |
David Teigland | 513ef59 | 2012-03-30 11:46:08 -0500 | [diff] [blame] | 1746 | dlm_allow_conn = 0; |
Christine Caulfield | 5e9ccc3 | 2009-01-28 12:57:40 -0600 | [diff] [blame] | 1747 | foreach_conn(stop_conn); |
Matthias Kaehlcke | 7a936ce | 2008-05-12 10:04:51 -0500 | [diff] [blame] | 1748 | mutex_unlock(&connections_lock); |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 1749 | |
| 1750 | work_stop(); |
| 1751 | |
Matthias Kaehlcke | 7a936ce | 2008-05-12 10:04:51 -0500 | [diff] [blame] | 1752 | mutex_lock(&connections_lock); |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 1753 | clean_writequeues(); |
| 1754 | |
Christine Caulfield | 5e9ccc3 | 2009-01-28 12:57:40 -0600 | [diff] [blame] | 1755 | foreach_conn(free_conn); |
| 1756 | |
Matthias Kaehlcke | 7a936ce | 2008-05-12 10:04:51 -0500 | [diff] [blame] | 1757 | mutex_unlock(&connections_lock); |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 1758 | kmem_cache_destroy(con_cache); |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 1759 | } |
| 1760 | |
| 1761 | int dlm_lowcomms_start(void) |
| 1762 | { |
| 1763 | int error = -EINVAL; |
| 1764 | struct connection *con; |
Christine Caulfield | 5e9ccc3 | 2009-01-28 12:57:40 -0600 | [diff] [blame] | 1765 | int i; |
| 1766 | |
| 1767 | for (i = 0; i < CONN_HASH_SIZE; i++) |
| 1768 | INIT_HLIST_HEAD(&connection_hash[i]); |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 1769 | |
| 1770 | init_local(); |
| 1771 | if (!dlm_local_count) { |
David Teigland | 617e82e | 2007-04-26 13:46:49 -0500 | [diff] [blame] | 1772 | error = -ENOTCONN; |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 1773 | log_print("no local IP address has been set"); |
David Teigland | 513ef59 | 2012-03-30 11:46:08 -0500 | [diff] [blame] | 1774 | goto fail; |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 1775 | } |
| 1776 | |
| 1777 | error = -ENOMEM; |
| 1778 | con_cache = kmem_cache_create("dlm_conn", sizeof(struct connection), |
| 1779 | __alignof__(struct connection), 0, |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 1780 | NULL); |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 1781 | if (!con_cache) |
David Teigland | 513ef59 | 2012-03-30 11:46:08 -0500 | [diff] [blame] | 1782 | goto fail; |
| 1783 | |
| 1784 | error = work_start(); |
| 1785 | if (error) |
| 1786 | goto fail_destroy; |
| 1787 | |
| 1788 | dlm_allow_conn = 1; |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 1789 | |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 1790 | /* Start listening */ |
| 1791 | if (dlm_config.ci_protocol == 0) |
| 1792 | error = tcp_listen_for_all(); |
| 1793 | else |
| 1794 | error = sctp_listen_for_all(); |
| 1795 | if (error) |
| 1796 | goto fail_unlisten; |
| 1797 | |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 1798 | return 0; |
| 1799 | |
| 1800 | fail_unlisten: |
David Teigland | 513ef59 | 2012-03-30 11:46:08 -0500 | [diff] [blame] | 1801 | dlm_allow_conn = 0; |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 1802 | con = nodeid2con(0,0); |
| 1803 | if (con) { |
| 1804 | close_connection(con, false); |
| 1805 | kmem_cache_free(con_cache, con); |
| 1806 | } |
David Teigland | 513ef59 | 2012-03-30 11:46:08 -0500 | [diff] [blame] | 1807 | fail_destroy: |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 1808 | kmem_cache_destroy(con_cache); |
David Teigland | 513ef59 | 2012-03-30 11:46:08 -0500 | [diff] [blame] | 1809 | fail: |
Patrick Caulfield | 6ed7257b | 2007-04-17 15:39:57 +0100 | [diff] [blame] | 1810 | return error; |
| 1811 | } |
David Teigland | 36b71a8 | 2012-07-26 12:44:30 -0500 | [diff] [blame] | 1812 | |
| 1813 | void dlm_lowcomms_exit(void) |
| 1814 | { |
| 1815 | struct dlm_node_addr *na, *safe; |
| 1816 | |
| 1817 | spin_lock(&dlm_node_addrs_spin); |
| 1818 | list_for_each_entry_safe(na, safe, &dlm_node_addrs, list) { |
| 1819 | list_del(&na->list); |
| 1820 | while (na->addr_count--) |
| 1821 | kfree(na->addr[na->addr_count]); |
| 1822 | kfree(na); |
| 1823 | } |
| 1824 | spin_unlock(&dlm_node_addrs_spin); |
| 1825 | } |