1 // SPDX-License-Identifier: GPL-2.0 2 #include <linux/ceph/ceph_debug.h> 3 4 #include <linux/crc32c.h> 5 #include <linux/ctype.h> 6 #include <linux/highmem.h> 7 #include <linux/inet.h> 8 #include <linux/kthread.h> 9 #include <linux/net.h> 10 #include <linux/nsproxy.h> 11 #include <linux/sched/mm.h> 12 #include <linux/slab.h> 13 #include <linux/socket.h> 14 #include <linux/string.h> 15 #ifdef CONFIG_BLOCK 16 #include <linux/bio.h> 17 #endif /* CONFIG_BLOCK */ 18 #include <linux/dns_resolver.h> 19 #include <net/tcp.h> 20 #include <trace/events/sock.h> 21 22 #include <linux/ceph/ceph_features.h> 23 #include <linux/ceph/libceph.h> 24 #include <linux/ceph/messenger.h> 25 #include <linux/ceph/decode.h> 26 #include <linux/ceph/pagelist.h> 27 #include <linux/export.h> 28 29 /* 30 * Ceph uses the messenger to exchange ceph_msg messages with other 31 * hosts in the system. The messenger provides ordered and reliable 32 * delivery. We tolerate TCP disconnects by reconnecting (with 33 * exponential backoff) in the case of a fault (disconnection, bad 34 * crc, protocol error). Acks allow sent messages to be discarded by 35 * the sender. 36 */ 37 38 /* 39 * We track the state of the socket on a given connection using 40 * values defined below. The transition to a new socket state is 41 * handled by a function which verifies we aren't coming from an 42 * unexpected state. 43 * 44 * -------- 45 * | NEW* | transient initial state 46 * -------- 47 * | con_sock_state_init() 48 * v 49 * ---------- 50 * | CLOSED | initialized, but no socket (and no 51 * ---------- TCP connection) 52 * ^ \ 53 * | \ con_sock_state_connecting() 54 * | ---------------------- 55 * | \ 56 * + con_sock_state_closed() \ 57 * |+--------------------------- \ 58 * | \ \ \ 59 * | ----------- \ \ 60 * | | CLOSING | socket event; \ \ 61 * | ----------- await close \ \ 62 * | ^ \ | 63 * | | \ | 64 * | + con_sock_state_closing() \ | 65 * | / \ | | 66 * | / --------------- | | 67 * | / \ v v 68 * | / -------------- 69 * | / -----------------| CONNECTING | socket created, TCP 70 * | | / -------------- connect initiated 71 * | | | con_sock_state_connected() 72 * | | v 73 * ------------- 74 * | CONNECTED | TCP connection established 75 * ------------- 76 * 77 * State values for ceph_connection->sock_state; NEW is assumed to be 0. 78 */ 79 80 #define CON_SOCK_STATE_NEW 0 /* -> CLOSED */ 81 #define CON_SOCK_STATE_CLOSED 1 /* -> CONNECTING */ 82 #define CON_SOCK_STATE_CONNECTING 2 /* -> CONNECTED or -> CLOSING */ 83 #define CON_SOCK_STATE_CONNECTED 3 /* -> CLOSING or -> CLOSED */ 84 #define CON_SOCK_STATE_CLOSING 4 /* -> CLOSED */ 85 86 static bool con_flag_valid(unsigned long con_flag) 87 { 88 switch (con_flag) { 89 case CEPH_CON_F_LOSSYTX: 90 case CEPH_CON_F_KEEPALIVE_PENDING: 91 case CEPH_CON_F_WRITE_PENDING: 92 case CEPH_CON_F_SOCK_CLOSED: 93 case CEPH_CON_F_BACKOFF: 94 return true; 95 default: 96 return false; 97 } 98 } 99 100 void ceph_con_flag_clear(struct ceph_connection *con, unsigned long con_flag) 101 { 102 BUG_ON(!con_flag_valid(con_flag)); 103 104 clear_bit(con_flag, &con->flags); 105 } 106 107 void ceph_con_flag_set(struct ceph_connection *con, unsigned long con_flag) 108 { 109 BUG_ON(!con_flag_valid(con_flag)); 110 111 set_bit(con_flag, &con->flags); 112 } 113 114 bool ceph_con_flag_test(struct ceph_connection *con, unsigned long con_flag) 115 { 116 BUG_ON(!con_flag_valid(con_flag)); 117 118 return test_bit(con_flag, &con->flags); 119 } 120 121 bool ceph_con_flag_test_and_clear(struct ceph_connection *con, 122 unsigned long con_flag) 123 { 124 BUG_ON(!con_flag_valid(con_flag)); 125 126 return test_and_clear_bit(con_flag, &con->flags); 127 } 128 129 bool ceph_con_flag_test_and_set(struct ceph_connection *con, 130 unsigned long con_flag) 131 { 132 BUG_ON(!con_flag_valid(con_flag)); 133 134 return test_and_set_bit(con_flag, &con->flags); 135 } 136 137 /* Slab caches for frequently-allocated structures */ 138 139 static struct kmem_cache *ceph_msg_cache; 140 141 #ifdef CONFIG_LOCKDEP 142 static struct lock_class_key socket_class; 143 #endif 144 145 static void queue_con(struct ceph_connection *con); 146 static void cancel_con(struct ceph_connection *con); 147 static void ceph_con_workfn(struct work_struct *); 148 static void con_fault(struct ceph_connection *con); 149 150 /* 151 * Nicely render a sockaddr as a string. An array of formatted 152 * strings is used, to approximate reentrancy. 153 */ 154 #define ADDR_STR_COUNT_LOG 5 /* log2(# address strings in array) */ 155 #define ADDR_STR_COUNT (1 << ADDR_STR_COUNT_LOG) 156 #define ADDR_STR_COUNT_MASK (ADDR_STR_COUNT - 1) 157 #define MAX_ADDR_STR_LEN 64 /* 54 is enough */ 158 159 static char addr_str[ADDR_STR_COUNT][MAX_ADDR_STR_LEN]; 160 static atomic_t addr_str_seq = ATOMIC_INIT(0); 161 162 struct page *ceph_zero_page; /* used in certain error cases */ 163 164 const char *ceph_pr_addr(const struct ceph_entity_addr *addr) 165 { 166 int i; 167 char *s; 168 struct sockaddr_storage ss = addr->in_addr; /* align */ 169 struct sockaddr_in *in4 = (struct sockaddr_in *)&ss; 170 struct sockaddr_in6 *in6 = (struct sockaddr_in6 *)&ss; 171 172 i = atomic_inc_return(&addr_str_seq) & ADDR_STR_COUNT_MASK; 173 s = addr_str[i]; 174 175 switch (ss.ss_family) { 176 case AF_INET: 177 snprintf(s, MAX_ADDR_STR_LEN, "(%d)%pI4:%hu", 178 le32_to_cpu(addr->type), &in4->sin_addr, 179 ntohs(in4->sin_port)); 180 break; 181 182 case AF_INET6: 183 snprintf(s, MAX_ADDR_STR_LEN, "(%d)[%pI6c]:%hu", 184 le32_to_cpu(addr->type), &in6->sin6_addr, 185 ntohs(in6->sin6_port)); 186 break; 187 188 default: 189 snprintf(s, MAX_ADDR_STR_LEN, "(unknown sockaddr family %hu)", 190 ss.ss_family); 191 } 192 193 return s; 194 } 195 EXPORT_SYMBOL(ceph_pr_addr); 196 197 void ceph_encode_my_addr(struct ceph_messenger *msgr) 198 { 199 if (!ceph_msgr2(from_msgr(msgr))) { 200 memcpy(&msgr->my_enc_addr, &msgr->inst.addr, 201 sizeof(msgr->my_enc_addr)); 202 ceph_encode_banner_addr(&msgr->my_enc_addr); 203 } 204 } 205 206 /* 207 * work queue for all reading and writing to/from the socket. 208 */ 209 static struct workqueue_struct *ceph_msgr_wq; 210 211 static int ceph_msgr_slab_init(void) 212 { 213 BUG_ON(ceph_msg_cache); 214 ceph_msg_cache = KMEM_CACHE(ceph_msg, 0); 215 if (!ceph_msg_cache) 216 return -ENOMEM; 217 218 return 0; 219 } 220 221 static void ceph_msgr_slab_exit(void) 222 { 223 BUG_ON(!ceph_msg_cache); 224 kmem_cache_destroy(ceph_msg_cache); 225 ceph_msg_cache = NULL; 226 } 227 228 static void _ceph_msgr_exit(void) 229 { 230 if (ceph_msgr_wq) { 231 destroy_workqueue(ceph_msgr_wq); 232 ceph_msgr_wq = NULL; 233 } 234 235 BUG_ON(!ceph_zero_page); 236 put_page(ceph_zero_page); 237 ceph_zero_page = NULL; 238 239 ceph_msgr_slab_exit(); 240 } 241 242 int __init ceph_msgr_init(void) 243 { 244 if (ceph_msgr_slab_init()) 245 return -ENOMEM; 246 247 BUG_ON(ceph_zero_page); 248 ceph_zero_page = ZERO_PAGE(0); 249 get_page(ceph_zero_page); 250 251 /* 252 * The number of active work items is limited by the number of 253 * connections, so leave @max_active at default. 254 */ 255 ceph_msgr_wq = alloc_workqueue("ceph-msgr", 256 WQ_MEM_RECLAIM | WQ_PERCPU, 0); 257 if (ceph_msgr_wq) 258 return 0; 259 260 pr_err("msgr_init failed to create workqueue\n"); 261 _ceph_msgr_exit(); 262 263 return -ENOMEM; 264 } 265 266 void ceph_msgr_exit(void) 267 { 268 BUG_ON(ceph_msgr_wq == NULL); 269 270 _ceph_msgr_exit(); 271 } 272 273 void ceph_msgr_flush(void) 274 { 275 flush_workqueue(ceph_msgr_wq); 276 } 277 EXPORT_SYMBOL(ceph_msgr_flush); 278 279 /* Connection socket state transition functions */ 280 281 static void con_sock_state_init(struct ceph_connection *con) 282 { 283 int old_state; 284 285 old_state = atomic_xchg(&con->sock_state, CON_SOCK_STATE_CLOSED); 286 if (WARN_ON(old_state != CON_SOCK_STATE_NEW)) 287 printk("%s: unexpected old state %d\n", __func__, old_state); 288 dout("%s con %p sock %d -> %d\n", __func__, con, old_state, 289 CON_SOCK_STATE_CLOSED); 290 } 291 292 static void con_sock_state_connecting(struct ceph_connection *con) 293 { 294 int old_state; 295 296 old_state = atomic_xchg(&con->sock_state, CON_SOCK_STATE_CONNECTING); 297 if (WARN_ON(old_state != CON_SOCK_STATE_CLOSED)) 298 printk("%s: unexpected old state %d\n", __func__, old_state); 299 dout("%s con %p sock %d -> %d\n", __func__, con, old_state, 300 CON_SOCK_STATE_CONNECTING); 301 } 302 303 static void con_sock_state_connected(struct ceph_connection *con) 304 { 305 int old_state; 306 307 old_state = atomic_xchg(&con->sock_state, CON_SOCK_STATE_CONNECTED); 308 if (WARN_ON(old_state != CON_SOCK_STATE_CONNECTING)) 309 printk("%s: unexpected old state %d\n", __func__, old_state); 310 dout("%s con %p sock %d -> %d\n", __func__, con, old_state, 311 CON_SOCK_STATE_CONNECTED); 312 } 313 314 static void con_sock_state_closing(struct ceph_connection *con) 315 { 316 int old_state; 317 318 old_state = atomic_xchg(&con->sock_state, CON_SOCK_STATE_CLOSING); 319 if (WARN_ON(old_state != CON_SOCK_STATE_CONNECTING && 320 old_state != CON_SOCK_STATE_CONNECTED && 321 old_state != CON_SOCK_STATE_CLOSING)) 322 printk("%s: unexpected old state %d\n", __func__, old_state); 323 dout("%s con %p sock %d -> %d\n", __func__, con, old_state, 324 CON_SOCK_STATE_CLOSING); 325 } 326 327 static void con_sock_state_closed(struct ceph_connection *con) 328 { 329 int old_state; 330 331 old_state = atomic_xchg(&con->sock_state, CON_SOCK_STATE_CLOSED); 332 if (WARN_ON(old_state != CON_SOCK_STATE_CONNECTED && 333 old_state != CON_SOCK_STATE_CLOSING && 334 old_state != CON_SOCK_STATE_CONNECTING && 335 old_state != CON_SOCK_STATE_CLOSED)) 336 printk("%s: unexpected old state %d\n", __func__, old_state); 337 dout("%s con %p sock %d -> %d\n", __func__, con, old_state, 338 CON_SOCK_STATE_CLOSED); 339 } 340 341 /* 342 * socket callback functions 343 */ 344 345 /* data available on socket, or listen socket received a connect */ 346 static void ceph_sock_data_ready(struct sock *sk) 347 { 348 struct ceph_connection *con = sk->sk_user_data; 349 350 trace_sk_data_ready(sk); 351 352 if (atomic_read(&con->msgr->stopping)) { 353 return; 354 } 355 356 if (sk->sk_state != TCP_CLOSE_WAIT) { 357 dout("%s %p state = %d, queueing work\n", __func__, 358 con, con->state); 359 queue_con(con); 360 } 361 } 362 363 /* socket has buffer space for writing */ 364 static void ceph_sock_write_space(struct sock *sk) 365 { 366 struct ceph_connection *con = sk->sk_user_data; 367 368 /* only queue to workqueue if there is data we want to write, 369 * and there is sufficient space in the socket buffer to accept 370 * more data. clear SOCK_NOSPACE so that ceph_sock_write_space() 371 * doesn't get called again until ceph_con_v[12]_try_write() fills 372 * the socket buffer. See net/ipv4/tcp_input.c:tcp_check_space() 373 * and net/core/stream.c:sk_stream_write_space(). 374 */ 375 if (ceph_con_flag_test(con, CEPH_CON_F_WRITE_PENDING)) { 376 if (sk_stream_is_writeable(sk)) { 377 dout("%s %p queueing write work\n", __func__, con); 378 clear_bit(SOCK_NOSPACE, &sk->sk_socket->flags); 379 queue_con(con); 380 } 381 } else { 382 dout("%s %p nothing to write\n", __func__, con); 383 } 384 } 385 386 /* socket's state has changed */ 387 static void ceph_sock_state_change(struct sock *sk) 388 { 389 struct ceph_connection *con = sk->sk_user_data; 390 391 dout("%s %p state = %d sk_state = %u\n", __func__, 392 con, con->state, sk->sk_state); 393 394 switch (sk->sk_state) { 395 case TCP_CLOSE: 396 dout("%s TCP_CLOSE\n", __func__); 397 fallthrough; 398 case TCP_CLOSE_WAIT: 399 dout("%s TCP_CLOSE_WAIT\n", __func__); 400 con_sock_state_closing(con); 401 ceph_con_flag_set(con, CEPH_CON_F_SOCK_CLOSED); 402 queue_con(con); 403 break; 404 case TCP_ESTABLISHED: 405 dout("%s TCP_ESTABLISHED\n", __func__); 406 con_sock_state_connected(con); 407 queue_con(con); 408 break; 409 default: /* Everything else is uninteresting */ 410 break; 411 } 412 } 413 414 /* 415 * set up socket callbacks 416 */ 417 static void set_sock_callbacks(struct socket *sock, 418 struct ceph_connection *con) 419 { 420 struct sock *sk = sock->sk; 421 sk->sk_user_data = con; 422 sk->sk_data_ready = ceph_sock_data_ready; 423 sk->sk_write_space = ceph_sock_write_space; 424 sk->sk_state_change = ceph_sock_state_change; 425 } 426 427 428 /* 429 * socket helpers 430 */ 431 432 /* 433 * initiate connection to a remote socket. 434 */ 435 int ceph_tcp_connect(struct ceph_connection *con) 436 { 437 struct sockaddr_storage ss = con->peer_addr.in_addr; /* align */ 438 struct socket *sock; 439 unsigned int noio_flag; 440 int ret; 441 442 dout("%s con %p peer_addr %s\n", __func__, con, 443 ceph_pr_addr(&con->peer_addr)); 444 BUG_ON(con->sock); 445 446 /* sock_create_kern() allocates with GFP_KERNEL */ 447 noio_flag = memalloc_noio_save(); 448 ret = sock_create_kern(read_pnet(&con->msgr->net), ss.ss_family, 449 SOCK_STREAM, IPPROTO_TCP, &sock); 450 memalloc_noio_restore(noio_flag); 451 if (ret) 452 return ret; 453 sock->sk->sk_allocation = GFP_NOFS; 454 sock->sk->sk_use_task_frag = false; 455 456 #ifdef CONFIG_LOCKDEP 457 lockdep_set_class(&sock->sk->sk_lock, &socket_class); 458 #endif 459 460 set_sock_callbacks(sock, con); 461 462 con_sock_state_connecting(con); 463 ret = kernel_connect(sock, (struct sockaddr_unsized *)&ss, sizeof(ss), 464 O_NONBLOCK); 465 if (ret == -EINPROGRESS) { 466 dout("connect %s EINPROGRESS sk_state = %u\n", 467 ceph_pr_addr(&con->peer_addr), 468 sock->sk->sk_state); 469 } else if (ret < 0) { 470 pr_err("connect %s error %d\n", 471 ceph_pr_addr(&con->peer_addr), ret); 472 sock_release(sock); 473 return ret; 474 } 475 476 if (ceph_test_opt(from_msgr(con->msgr), TCP_NODELAY)) 477 tcp_sock_set_nodelay(sock->sk); 478 479 con->sock = sock; 480 return 0; 481 } 482 483 /* 484 * Shutdown/close the socket for the given connection. 485 */ 486 int ceph_con_close_socket(struct ceph_connection *con) 487 { 488 int rc = 0; 489 490 dout("%s con %p sock %p\n", __func__, con, con->sock); 491 if (con->sock) { 492 rc = con->sock->ops->shutdown(con->sock, SHUT_RDWR); 493 sock_release(con->sock); 494 con->sock = NULL; 495 } 496 497 /* 498 * Forcibly clear the SOCK_CLOSED flag. It gets set 499 * independent of the connection mutex, and we could have 500 * received a socket close event before we had the chance to 501 * shut the socket down. 502 */ 503 ceph_con_flag_clear(con, CEPH_CON_F_SOCK_CLOSED); 504 505 con_sock_state_closed(con); 506 return rc; 507 } 508 509 static void ceph_con_reset_protocol(struct ceph_connection *con) 510 { 511 dout("%s con %p\n", __func__, con); 512 513 ceph_con_close_socket(con); 514 if (con->in_msg) { 515 WARN_ON(con->in_msg->con != con); 516 ceph_msg_put(con->in_msg); 517 con->in_msg = NULL; 518 } 519 if (con->out_msg) { 520 WARN_ON(con->out_msg->con != con); 521 ceph_msg_put(con->out_msg); 522 con->out_msg = NULL; 523 } 524 if (con->bounce_page) { 525 __free_page(con->bounce_page); 526 con->bounce_page = NULL; 527 } 528 529 if (ceph_msgr2(from_msgr(con->msgr))) 530 ceph_con_v2_reset_protocol(con); 531 else 532 ceph_con_v1_reset_protocol(con); 533 } 534 535 /* 536 * Reset a connection. Discard all incoming and outgoing messages 537 * and clear *_seq state. 538 */ 539 static void ceph_msg_remove(struct ceph_msg *msg) 540 { 541 list_del_init(&msg->list_head); 542 543 ceph_msg_put(msg); 544 } 545 546 static void ceph_msg_remove_list(struct list_head *head) 547 { 548 while (!list_empty(head)) { 549 struct ceph_msg *msg = list_first_entry(head, struct ceph_msg, 550 list_head); 551 ceph_msg_remove(msg); 552 } 553 } 554 555 void ceph_con_reset_session(struct ceph_connection *con) 556 { 557 dout("%s con %p\n", __func__, con); 558 559 WARN_ON(con->in_msg); 560 WARN_ON(con->out_msg); 561 ceph_msg_remove_list(&con->out_queue); 562 ceph_msg_remove_list(&con->out_sent); 563 con->out_seq = 0; 564 con->in_seq = 0; 565 con->in_seq_acked = 0; 566 567 if (ceph_msgr2(from_msgr(con->msgr))) 568 ceph_con_v2_reset_session(con); 569 else 570 ceph_con_v1_reset_session(con); 571 } 572 573 /* 574 * mark a peer down. drop any open connections. 575 */ 576 void ceph_con_close(struct ceph_connection *con) 577 { 578 mutex_lock(&con->mutex); 579 dout("con_close %p peer %s\n", con, ceph_pr_addr(&con->peer_addr)); 580 con->state = CEPH_CON_S_CLOSED; 581 582 ceph_con_flag_clear(con, CEPH_CON_F_LOSSYTX); /* so we retry next 583 connect */ 584 ceph_con_flag_clear(con, CEPH_CON_F_KEEPALIVE_PENDING); 585 ceph_con_flag_clear(con, CEPH_CON_F_WRITE_PENDING); 586 ceph_con_flag_clear(con, CEPH_CON_F_BACKOFF); 587 588 ceph_con_reset_protocol(con); 589 ceph_con_reset_session(con); 590 cancel_con(con); 591 mutex_unlock(&con->mutex); 592 } 593 EXPORT_SYMBOL(ceph_con_close); 594 595 /* 596 * Reopen a closed connection, with a new peer address. 597 */ 598 void ceph_con_open(struct ceph_connection *con, 599 __u8 entity_type, __u64 entity_num, 600 struct ceph_entity_addr *addr) 601 { 602 mutex_lock(&con->mutex); 603 dout("con_open %p %s\n", con, ceph_pr_addr(addr)); 604 605 WARN_ON(con->state != CEPH_CON_S_CLOSED); 606 con->state = CEPH_CON_S_PREOPEN; 607 608 con->peer_name.type = (__u8) entity_type; 609 con->peer_name.num = cpu_to_le64(entity_num); 610 611 memcpy(&con->peer_addr, addr, sizeof(*addr)); 612 con->delay = 0; /* reset backoff memory */ 613 mutex_unlock(&con->mutex); 614 queue_con(con); 615 } 616 EXPORT_SYMBOL(ceph_con_open); 617 618 /* 619 * return true if this connection ever successfully opened 620 */ 621 bool ceph_con_opened(struct ceph_connection *con) 622 { 623 if (ceph_msgr2(from_msgr(con->msgr))) 624 return ceph_con_v2_opened(con); 625 626 return ceph_con_v1_opened(con); 627 } 628 629 /* 630 * initialize a new connection. 631 */ 632 void ceph_con_init(struct ceph_connection *con, void *private, 633 const struct ceph_connection_operations *ops, 634 struct ceph_messenger *msgr) 635 { 636 dout("con_init %p\n", con); 637 memset(con, 0, sizeof(*con)); 638 con->private = private; 639 con->ops = ops; 640 con->msgr = msgr; 641 642 con_sock_state_init(con); 643 644 mutex_init(&con->mutex); 645 INIT_LIST_HEAD(&con->out_queue); 646 INIT_LIST_HEAD(&con->out_sent); 647 INIT_DELAYED_WORK(&con->work, ceph_con_workfn); 648 649 con->state = CEPH_CON_S_CLOSED; 650 } 651 EXPORT_SYMBOL(ceph_con_init); 652 653 /* 654 * We maintain a global counter to order connection attempts. Get 655 * a unique seq greater than @gt. 656 */ 657 u32 ceph_get_global_seq(struct ceph_messenger *msgr, u32 gt) 658 { 659 u32 ret; 660 661 spin_lock(&msgr->global_seq_lock); 662 if (msgr->global_seq < gt) 663 msgr->global_seq = gt; 664 ret = ++msgr->global_seq; 665 spin_unlock(&msgr->global_seq_lock); 666 return ret; 667 } 668 669 /* 670 * Discard messages that have been acked by the server. 671 */ 672 void ceph_con_discard_sent(struct ceph_connection *con, u64 ack_seq) 673 { 674 struct ceph_msg *msg; 675 u64 seq; 676 677 dout("%s con %p ack_seq %llu\n", __func__, con, ack_seq); 678 while (!list_empty(&con->out_sent)) { 679 msg = list_first_entry(&con->out_sent, struct ceph_msg, 680 list_head); 681 WARN_ON(msg->needs_out_seq); 682 seq = le64_to_cpu(msg->hdr.seq); 683 if (seq > ack_seq) 684 break; 685 686 dout("%s con %p discarding msg %p seq %llu\n", __func__, con, 687 msg, seq); 688 ceph_msg_remove(msg); 689 } 690 } 691 692 /* 693 * Discard messages that have been requeued in con_fault(), up to 694 * reconnect_seq. This avoids gratuitously resending messages that 695 * the server had received and handled prior to reconnect. 696 */ 697 void ceph_con_discard_requeued(struct ceph_connection *con, u64 reconnect_seq) 698 { 699 struct ceph_msg *msg; 700 u64 seq; 701 702 dout("%s con %p reconnect_seq %llu\n", __func__, con, reconnect_seq); 703 while (!list_empty(&con->out_queue)) { 704 msg = list_first_entry(&con->out_queue, struct ceph_msg, 705 list_head); 706 if (msg->needs_out_seq) 707 break; 708 seq = le64_to_cpu(msg->hdr.seq); 709 if (seq > reconnect_seq) 710 break; 711 712 dout("%s con %p discarding msg %p seq %llu\n", __func__, con, 713 msg, seq); 714 ceph_msg_remove(msg); 715 } 716 } 717 718 #ifdef CONFIG_BLOCK 719 720 /* 721 * For a bio data item, a piece is whatever remains of the next 722 * entry in the current bio iovec, or the first entry in the next 723 * bio in the list. 724 */ 725 static void ceph_msg_data_bio_cursor_init(struct ceph_msg_data_cursor *cursor, 726 size_t length) 727 { 728 struct ceph_msg_data *data = cursor->data; 729 struct ceph_bio_iter *it = &cursor->bio_iter; 730 731 cursor->resid = min_t(size_t, length, data->bio_length); 732 *it = data->bio_pos; 733 if (cursor->resid < it->iter.bi_size) 734 it->iter.bi_size = cursor->resid; 735 736 BUG_ON(cursor->resid < bio_iter_len(it->bio, it->iter)); 737 } 738 739 static struct page *ceph_msg_data_bio_next(struct ceph_msg_data_cursor *cursor, 740 size_t *page_offset, 741 size_t *length) 742 { 743 struct bio_vec bv = bio_iter_iovec(cursor->bio_iter.bio, 744 cursor->bio_iter.iter); 745 746 *page_offset = bv.bv_offset; 747 *length = bv.bv_len; 748 return bv.bv_page; 749 } 750 751 static bool ceph_msg_data_bio_advance(struct ceph_msg_data_cursor *cursor, 752 size_t bytes) 753 { 754 struct ceph_bio_iter *it = &cursor->bio_iter; 755 struct page *page = bio_iter_page(it->bio, it->iter); 756 757 BUG_ON(bytes > cursor->resid); 758 BUG_ON(bytes > bio_iter_len(it->bio, it->iter)); 759 cursor->resid -= bytes; 760 bio_advance_iter(it->bio, &it->iter, bytes); 761 762 if (!cursor->resid) 763 return false; /* no more data */ 764 765 if (!bytes || (it->iter.bi_size && it->iter.bi_offset && 766 page == bio_iter_page(it->bio, it->iter))) 767 return false; /* more bytes to process in this segment */ 768 769 if (!it->iter.bi_size) { 770 it->bio = it->bio->bi_next; 771 it->iter = it->bio->bi_iter; 772 if (cursor->resid < it->iter.bi_size) 773 it->iter.bi_size = cursor->resid; 774 } 775 776 BUG_ON(cursor->resid < bio_iter_len(it->bio, it->iter)); 777 return true; 778 } 779 #endif /* CONFIG_BLOCK */ 780 781 static void ceph_msg_data_bvecs_cursor_init(struct ceph_msg_data_cursor *cursor, 782 size_t length) 783 { 784 struct ceph_msg_data *data = cursor->data; 785 struct bio_vec *bvecs = data->bvec_pos.bvecs; 786 787 cursor->resid = min_t(size_t, length, data->bvec_pos.iter.bi_size); 788 cursor->bvec_iter = data->bvec_pos.iter; 789 cursor->bvec_iter.bi_size = cursor->resid; 790 791 BUG_ON(cursor->resid < bvec_iter_len(bvecs, cursor->bvec_iter)); 792 } 793 794 static struct page *ceph_msg_data_bvecs_next(struct ceph_msg_data_cursor *cursor, 795 size_t *page_offset, 796 size_t *length) 797 { 798 struct bio_vec bv = bvec_iter_bvec(cursor->data->bvec_pos.bvecs, 799 cursor->bvec_iter); 800 801 *page_offset = bv.bv_offset; 802 *length = bv.bv_len; 803 return bv.bv_page; 804 } 805 806 static bool ceph_msg_data_bvecs_advance(struct ceph_msg_data_cursor *cursor, 807 size_t bytes) 808 { 809 struct bio_vec *bvecs = cursor->data->bvec_pos.bvecs; 810 struct page *page = bvec_iter_page(bvecs, cursor->bvec_iter); 811 812 BUG_ON(bytes > cursor->resid); 813 BUG_ON(bytes > bvec_iter_len(bvecs, cursor->bvec_iter)); 814 cursor->resid -= bytes; 815 bvec_iter_advance(bvecs, &cursor->bvec_iter, bytes); 816 817 if (!cursor->resid) 818 return false; /* no more data */ 819 820 if (!bytes || (cursor->bvec_iter.bi_offset && 821 page == bvec_iter_page(bvecs, cursor->bvec_iter))) 822 return false; /* more bytes to process in this segment */ 823 824 BUG_ON(cursor->resid < bvec_iter_len(bvecs, cursor->bvec_iter)); 825 return true; 826 } 827 828 /* 829 * For a page array, a piece comes from the first page in the array 830 * that has not already been fully consumed. 831 */ 832 static void ceph_msg_data_pages_cursor_init(struct ceph_msg_data_cursor *cursor, 833 size_t length) 834 { 835 struct ceph_msg_data *data = cursor->data; 836 int page_count; 837 838 BUG_ON(data->type != CEPH_MSG_DATA_PAGES); 839 840 BUG_ON(!data->pages); 841 BUG_ON(!data->length); 842 843 cursor->resid = min(length, data->length); 844 page_count = calc_pages_for(data->alignment, (u64)data->length); 845 cursor->page_offset = data->alignment & ~PAGE_MASK; 846 cursor->page_index = 0; 847 BUG_ON(page_count > (int)USHRT_MAX); 848 cursor->page_count = (unsigned short)page_count; 849 BUG_ON(length > SIZE_MAX - cursor->page_offset); 850 } 851 852 static struct page * 853 ceph_msg_data_pages_next(struct ceph_msg_data_cursor *cursor, 854 size_t *page_offset, size_t *length) 855 { 856 struct ceph_msg_data *data = cursor->data; 857 858 BUG_ON(data->type != CEPH_MSG_DATA_PAGES); 859 860 BUG_ON(cursor->page_index >= cursor->page_count); 861 BUG_ON(cursor->page_offset >= PAGE_SIZE); 862 863 *page_offset = cursor->page_offset; 864 *length = min_t(size_t, cursor->resid, PAGE_SIZE - *page_offset); 865 return data->pages[cursor->page_index]; 866 } 867 868 static bool ceph_msg_data_pages_advance(struct ceph_msg_data_cursor *cursor, 869 size_t bytes) 870 { 871 BUG_ON(cursor->data->type != CEPH_MSG_DATA_PAGES); 872 873 BUG_ON(cursor->page_offset + bytes > PAGE_SIZE); 874 875 /* Advance the cursor page offset */ 876 877 cursor->resid -= bytes; 878 cursor->page_offset = (cursor->page_offset + bytes) & ~PAGE_MASK; 879 if (!bytes || cursor->page_offset) 880 return false; /* more bytes to process in the current page */ 881 882 if (!cursor->resid) 883 return false; /* no more data */ 884 885 /* Move on to the next page; offset is already at 0 */ 886 887 BUG_ON(cursor->page_index >= cursor->page_count); 888 cursor->page_index++; 889 return true; 890 } 891 892 /* 893 * For a pagelist, a piece is whatever remains to be consumed in the 894 * first page in the list, or the front of the next page. 895 */ 896 static void 897 ceph_msg_data_pagelist_cursor_init(struct ceph_msg_data_cursor *cursor, 898 size_t length) 899 { 900 struct ceph_msg_data *data = cursor->data; 901 struct ceph_pagelist *pagelist; 902 struct page *page; 903 904 BUG_ON(data->type != CEPH_MSG_DATA_PAGELIST); 905 906 pagelist = data->pagelist; 907 BUG_ON(!pagelist); 908 909 if (!length) 910 return; /* pagelist can be assigned but empty */ 911 912 BUG_ON(list_empty(&pagelist->head)); 913 page = list_first_entry(&pagelist->head, struct page, lru); 914 915 cursor->resid = min(length, pagelist->length); 916 cursor->page = page; 917 cursor->offset = 0; 918 } 919 920 static struct page * 921 ceph_msg_data_pagelist_next(struct ceph_msg_data_cursor *cursor, 922 size_t *page_offset, size_t *length) 923 { 924 struct ceph_msg_data *data = cursor->data; 925 struct ceph_pagelist *pagelist; 926 927 BUG_ON(data->type != CEPH_MSG_DATA_PAGELIST); 928 929 pagelist = data->pagelist; 930 BUG_ON(!pagelist); 931 932 BUG_ON(!cursor->page); 933 BUG_ON(cursor->offset + cursor->resid != pagelist->length); 934 935 /* offset of first page in pagelist is always 0 */ 936 *page_offset = cursor->offset & ~PAGE_MASK; 937 *length = min_t(size_t, cursor->resid, PAGE_SIZE - *page_offset); 938 return cursor->page; 939 } 940 941 static bool ceph_msg_data_pagelist_advance(struct ceph_msg_data_cursor *cursor, 942 size_t bytes) 943 { 944 struct ceph_msg_data *data = cursor->data; 945 struct ceph_pagelist *pagelist; 946 947 BUG_ON(data->type != CEPH_MSG_DATA_PAGELIST); 948 949 pagelist = data->pagelist; 950 BUG_ON(!pagelist); 951 952 BUG_ON(cursor->offset + cursor->resid != pagelist->length); 953 BUG_ON((cursor->offset & ~PAGE_MASK) + bytes > PAGE_SIZE); 954 955 /* Advance the cursor offset */ 956 957 cursor->resid -= bytes; 958 cursor->offset += bytes; 959 /* offset of first page in pagelist is always 0 */ 960 if (!bytes || cursor->offset & ~PAGE_MASK) 961 return false; /* more bytes to process in the current page */ 962 963 if (!cursor->resid) 964 return false; /* no more data */ 965 966 /* Move on to the next page */ 967 968 BUG_ON(list_is_last(&cursor->page->lru, &pagelist->head)); 969 cursor->page = list_next_entry(cursor->page, lru); 970 return true; 971 } 972 973 static void ceph_msg_data_iter_cursor_init(struct ceph_msg_data_cursor *cursor, 974 size_t length) 975 { 976 struct ceph_msg_data *data = cursor->data; 977 978 cursor->iov_iter = data->iter; 979 cursor->lastlen = 0; 980 iov_iter_truncate(&cursor->iov_iter, length); 981 cursor->resid = iov_iter_count(&cursor->iov_iter); 982 } 983 984 static struct page *ceph_msg_data_iter_next(struct ceph_msg_data_cursor *cursor, 985 size_t *page_offset, size_t *length) 986 { 987 struct page *page; 988 ssize_t len; 989 990 if (cursor->lastlen) 991 iov_iter_revert(&cursor->iov_iter, cursor->lastlen); 992 993 len = iov_iter_get_pages2(&cursor->iov_iter, &page, PAGE_SIZE, 994 1, page_offset); 995 BUG_ON(len < 0); 996 997 cursor->lastlen = len; 998 999 /* 1000 * FIXME: The assumption is that the pages represented by the iov_iter 1001 * are pinned, with the references held by the upper-level 1002 * callers, or by virtue of being under writeback. Eventually, 1003 * we'll get an iov_iter_get_pages2 variant that doesn't take 1004 * page refs. Until then, just put the page ref. 1005 */ 1006 put_page(page); 1007 1008 *length = min_t(size_t, len, cursor->resid); 1009 return page; 1010 } 1011 1012 static bool ceph_msg_data_iter_advance(struct ceph_msg_data_cursor *cursor, 1013 size_t bytes) 1014 { 1015 BUG_ON(bytes > cursor->resid); 1016 cursor->resid -= bytes; 1017 1018 if (bytes < cursor->lastlen) { 1019 cursor->lastlen -= bytes; 1020 } else { 1021 iov_iter_advance(&cursor->iov_iter, bytes - cursor->lastlen); 1022 cursor->lastlen = 0; 1023 } 1024 1025 return cursor->resid; 1026 } 1027 1028 /* 1029 * Message data is handled (sent or received) in pieces, where each 1030 * piece resides on a single page. The network layer might not 1031 * consume an entire piece at once. A data item's cursor keeps 1032 * track of which piece is next to process and how much remains to 1033 * be processed in that piece. It also tracks whether the current 1034 * piece is the last one in the data item. 1035 */ 1036 static void __ceph_msg_data_cursor_init(struct ceph_msg_data_cursor *cursor) 1037 { 1038 size_t length = cursor->total_resid; 1039 1040 switch (cursor->data->type) { 1041 case CEPH_MSG_DATA_PAGELIST: 1042 ceph_msg_data_pagelist_cursor_init(cursor, length); 1043 break; 1044 case CEPH_MSG_DATA_PAGES: 1045 ceph_msg_data_pages_cursor_init(cursor, length); 1046 break; 1047 #ifdef CONFIG_BLOCK 1048 case CEPH_MSG_DATA_BIO: 1049 ceph_msg_data_bio_cursor_init(cursor, length); 1050 break; 1051 #endif /* CONFIG_BLOCK */ 1052 case CEPH_MSG_DATA_BVECS: 1053 ceph_msg_data_bvecs_cursor_init(cursor, length); 1054 break; 1055 case CEPH_MSG_DATA_ITER: 1056 ceph_msg_data_iter_cursor_init(cursor, length); 1057 break; 1058 case CEPH_MSG_DATA_NONE: 1059 default: 1060 /* BUG(); */ 1061 break; 1062 } 1063 cursor->need_crc = true; 1064 } 1065 1066 void ceph_msg_data_cursor_init(struct ceph_msg_data_cursor *cursor, 1067 struct ceph_msg *msg, size_t length) 1068 { 1069 BUG_ON(!length); 1070 BUG_ON(length > msg->data_length); 1071 BUG_ON(!msg->num_data_items); 1072 1073 cursor->total_resid = length; 1074 cursor->data = msg->data; 1075 cursor->sr_resid = 0; 1076 1077 __ceph_msg_data_cursor_init(cursor); 1078 } 1079 1080 /* 1081 * Return the page containing the next piece to process for a given 1082 * data item, and supply the page offset and length of that piece. 1083 * Indicate whether this is the last piece in this data item. 1084 */ 1085 struct page *ceph_msg_data_next(struct ceph_msg_data_cursor *cursor, 1086 size_t *page_offset, size_t *length) 1087 { 1088 struct page *page; 1089 1090 switch (cursor->data->type) { 1091 case CEPH_MSG_DATA_PAGELIST: 1092 page = ceph_msg_data_pagelist_next(cursor, page_offset, length); 1093 break; 1094 case CEPH_MSG_DATA_PAGES: 1095 page = ceph_msg_data_pages_next(cursor, page_offset, length); 1096 break; 1097 #ifdef CONFIG_BLOCK 1098 case CEPH_MSG_DATA_BIO: 1099 page = ceph_msg_data_bio_next(cursor, page_offset, length); 1100 break; 1101 #endif /* CONFIG_BLOCK */ 1102 case CEPH_MSG_DATA_BVECS: 1103 page = ceph_msg_data_bvecs_next(cursor, page_offset, length); 1104 break; 1105 case CEPH_MSG_DATA_ITER: 1106 page = ceph_msg_data_iter_next(cursor, page_offset, length); 1107 break; 1108 case CEPH_MSG_DATA_NONE: 1109 default: 1110 page = NULL; 1111 break; 1112 } 1113 1114 BUG_ON(!page); 1115 BUG_ON(*page_offset + *length > PAGE_SIZE); 1116 BUG_ON(!*length); 1117 BUG_ON(*length > cursor->resid); 1118 1119 return page; 1120 } 1121 1122 /* 1123 * Returns true if the result moves the cursor on to the next piece 1124 * of the data item. 1125 */ 1126 void ceph_msg_data_advance(struct ceph_msg_data_cursor *cursor, size_t bytes) 1127 { 1128 bool new_piece; 1129 1130 BUG_ON(bytes > cursor->resid); 1131 switch (cursor->data->type) { 1132 case CEPH_MSG_DATA_PAGELIST: 1133 new_piece = ceph_msg_data_pagelist_advance(cursor, bytes); 1134 break; 1135 case CEPH_MSG_DATA_PAGES: 1136 new_piece = ceph_msg_data_pages_advance(cursor, bytes); 1137 break; 1138 #ifdef CONFIG_BLOCK 1139 case CEPH_MSG_DATA_BIO: 1140 new_piece = ceph_msg_data_bio_advance(cursor, bytes); 1141 break; 1142 #endif /* CONFIG_BLOCK */ 1143 case CEPH_MSG_DATA_BVECS: 1144 new_piece = ceph_msg_data_bvecs_advance(cursor, bytes); 1145 break; 1146 case CEPH_MSG_DATA_ITER: 1147 new_piece = ceph_msg_data_iter_advance(cursor, bytes); 1148 break; 1149 case CEPH_MSG_DATA_NONE: 1150 default: 1151 BUG(); 1152 break; 1153 } 1154 cursor->total_resid -= bytes; 1155 1156 if (!cursor->resid && cursor->total_resid) { 1157 cursor->data++; 1158 __ceph_msg_data_cursor_init(cursor); 1159 new_piece = true; 1160 } 1161 cursor->need_crc = new_piece; 1162 } 1163 1164 u32 ceph_crc32c_page(u32 crc, struct page *page, unsigned int page_offset, 1165 unsigned int length) 1166 { 1167 char *kaddr; 1168 1169 kaddr = kmap(page); 1170 BUG_ON(kaddr == NULL); 1171 crc = crc32c(crc, kaddr + page_offset, length); 1172 kunmap(page); 1173 1174 return crc; 1175 } 1176 1177 bool ceph_addr_is_blank(const struct ceph_entity_addr *addr) 1178 { 1179 struct sockaddr_storage ss = addr->in_addr; /* align */ 1180 struct in_addr *addr4 = &((struct sockaddr_in *)&ss)->sin_addr; 1181 struct in6_addr *addr6 = &((struct sockaddr_in6 *)&ss)->sin6_addr; 1182 1183 switch (ss.ss_family) { 1184 case AF_INET: 1185 return addr4->s_addr == htonl(INADDR_ANY); 1186 case AF_INET6: 1187 return ipv6_addr_any(addr6); 1188 default: 1189 return true; 1190 } 1191 } 1192 EXPORT_SYMBOL(ceph_addr_is_blank); 1193 1194 int ceph_addr_port(const struct ceph_entity_addr *addr) 1195 { 1196 switch (get_unaligned(&addr->in_addr.ss_family)) { 1197 case AF_INET: 1198 return ntohs(get_unaligned(&((struct sockaddr_in *)&addr->in_addr)->sin_port)); 1199 case AF_INET6: 1200 return ntohs(get_unaligned(&((struct sockaddr_in6 *)&addr->in_addr)->sin6_port)); 1201 } 1202 return 0; 1203 } 1204 1205 void ceph_addr_set_port(struct ceph_entity_addr *addr, int p) 1206 { 1207 switch (get_unaligned(&addr->in_addr.ss_family)) { 1208 case AF_INET: 1209 put_unaligned(htons(p), &((struct sockaddr_in *)&addr->in_addr)->sin_port); 1210 break; 1211 case AF_INET6: 1212 put_unaligned(htons(p), &((struct sockaddr_in6 *)&addr->in_addr)->sin6_port); 1213 break; 1214 } 1215 } 1216 1217 /* 1218 * Unlike other *_pton function semantics, zero indicates success. 1219 */ 1220 static int ceph_pton(const char *str, size_t len, struct ceph_entity_addr *addr, 1221 char delim, const char **ipend) 1222 { 1223 memset(&addr->in_addr, 0, sizeof(addr->in_addr)); 1224 1225 if (in4_pton(str, len, (u8 *)&((struct sockaddr_in *)&addr->in_addr)->sin_addr.s_addr, delim, ipend)) { 1226 put_unaligned(AF_INET, &addr->in_addr.ss_family); 1227 return 0; 1228 } 1229 1230 if (in6_pton(str, len, (u8 *)&((struct sockaddr_in6 *)&addr->in_addr)->sin6_addr.s6_addr, delim, ipend)) { 1231 put_unaligned(AF_INET6, &addr->in_addr.ss_family); 1232 return 0; 1233 } 1234 1235 return -EINVAL; 1236 } 1237 1238 /* 1239 * Extract hostname string and resolve using kernel DNS facility. 1240 */ 1241 #ifdef CONFIG_CEPH_LIB_USE_DNS_RESOLVER 1242 static int ceph_dns_resolve_name(const char *name, size_t namelen, 1243 struct ceph_entity_addr *addr, char delim, const char **ipend) 1244 { 1245 const char *end, *delim_p; 1246 char *colon_p, *ip_addr = NULL; 1247 int ip_len, ret; 1248 1249 /* 1250 * The end of the hostname occurs immediately preceding the delimiter or 1251 * the port marker (':') where the delimiter takes precedence. 1252 */ 1253 delim_p = memchr(name, delim, namelen); 1254 colon_p = memchr(name, ':', namelen); 1255 1256 if (delim_p && colon_p) 1257 end = min(delim_p, colon_p); 1258 else if (!delim_p && colon_p) 1259 end = colon_p; 1260 else { 1261 end = delim_p; 1262 if (!end) /* case: hostname:/ */ 1263 end = name + namelen; 1264 } 1265 1266 if (end <= name) 1267 return -EINVAL; 1268 1269 /* do dns_resolve upcall */ 1270 ip_len = dns_query(current->nsproxy->net_ns, 1271 NULL, name, end - name, NULL, &ip_addr, NULL, false); 1272 if (ip_len > 0) 1273 ret = ceph_pton(ip_addr, ip_len, addr, -1, NULL); 1274 else 1275 ret = -ESRCH; 1276 1277 kfree(ip_addr); 1278 1279 *ipend = end; 1280 1281 pr_info("resolve '%.*s' (ret=%d): %s\n", (int)(end - name), name, 1282 ret, ret ? "failed" : ceph_pr_addr(addr)); 1283 1284 return ret; 1285 } 1286 #else 1287 static inline int ceph_dns_resolve_name(const char *name, size_t namelen, 1288 struct ceph_entity_addr *addr, char delim, const char **ipend) 1289 { 1290 return -EINVAL; 1291 } 1292 #endif 1293 1294 /* 1295 * Parse a server name (IP or hostname). If a valid IP address is not found 1296 * then try to extract a hostname to resolve using userspace DNS upcall. 1297 */ 1298 static int ceph_parse_server_name(const char *name, size_t namelen, 1299 struct ceph_entity_addr *addr, char delim, const char **ipend) 1300 { 1301 int ret; 1302 1303 ret = ceph_pton(name, namelen, addr, delim, ipend); 1304 if (ret) 1305 ret = ceph_dns_resolve_name(name, namelen, addr, delim, ipend); 1306 1307 return ret; 1308 } 1309 1310 /* 1311 * Parse an ip[:port] list into an addr array. Use the default 1312 * monitor port if a port isn't specified. 1313 */ 1314 int ceph_parse_ips(const char *c, const char *end, 1315 struct ceph_entity_addr *addr, 1316 int max_count, int *count, char delim) 1317 { 1318 int i, ret = -EINVAL; 1319 const char *p = c; 1320 1321 dout("parse_ips on '%.*s'\n", (int)(end-c), c); 1322 for (i = 0; i < max_count; i++) { 1323 char cur_delim = delim; 1324 const char *ipend; 1325 int port; 1326 1327 if (*p == '[') { 1328 cur_delim = ']'; 1329 p++; 1330 } 1331 1332 ret = ceph_parse_server_name(p, end - p, &addr[i], cur_delim, 1333 &ipend); 1334 if (ret) 1335 goto bad; 1336 ret = -EINVAL; 1337 1338 p = ipend; 1339 1340 if (cur_delim == ']') { 1341 if (*p != ']') { 1342 dout("missing matching ']'\n"); 1343 goto bad; 1344 } 1345 p++; 1346 } 1347 1348 /* port? */ 1349 if (p < end && *p == ':') { 1350 port = 0; 1351 p++; 1352 while (p < end && *p >= '0' && *p <= '9') { 1353 port = (port * 10) + (*p - '0'); 1354 p++; 1355 } 1356 if (port == 0) 1357 port = CEPH_MON_PORT; 1358 else if (port > 65535) 1359 goto bad; 1360 } else { 1361 port = CEPH_MON_PORT; 1362 } 1363 1364 ceph_addr_set_port(&addr[i], port); 1365 /* 1366 * We want the type to be set according to ms_mode 1367 * option, but options are normally parsed after mon 1368 * addresses. Rather than complicating parsing, set 1369 * to LEGACY and override in build_initial_monmap() 1370 * for mon addresses and ceph_messenger_init() for 1371 * ip option. 1372 */ 1373 addr[i].type = CEPH_ENTITY_ADDR_TYPE_LEGACY; 1374 addr[i].nonce = 0; 1375 1376 dout("%s got %s\n", __func__, ceph_pr_addr(&addr[i])); 1377 1378 if (p == end) 1379 break; 1380 if (*p != delim) 1381 goto bad; 1382 p++; 1383 } 1384 1385 if (p != end) 1386 goto bad; 1387 1388 if (count) 1389 *count = i + 1; 1390 return 0; 1391 1392 bad: 1393 return ret; 1394 } 1395 1396 /* 1397 * Process message. This happens in the worker thread. The callback should 1398 * be careful not to do anything that waits on other incoming messages or it 1399 * may deadlock. 1400 */ 1401 void ceph_con_process_message(struct ceph_connection *con) 1402 { 1403 struct ceph_msg *msg = con->in_msg; 1404 1405 BUG_ON(con->in_msg->con != con); 1406 con->in_msg = NULL; 1407 1408 /* if first message, set peer_name */ 1409 if (con->peer_name.type == 0) 1410 con->peer_name = msg->hdr.src; 1411 1412 con->in_seq++; 1413 mutex_unlock(&con->mutex); 1414 1415 dout("===== %p %llu from %s%lld %d=%s len %d+%d+%d (%u %u %u) =====\n", 1416 msg, le64_to_cpu(msg->hdr.seq), 1417 ENTITY_NAME(msg->hdr.src), 1418 le16_to_cpu(msg->hdr.type), 1419 ceph_msg_type_name(le16_to_cpu(msg->hdr.type)), 1420 le32_to_cpu(msg->hdr.front_len), 1421 le32_to_cpu(msg->hdr.middle_len), 1422 le32_to_cpu(msg->hdr.data_len), 1423 con->in_front_crc, con->in_middle_crc, con->in_data_crc); 1424 con->ops->dispatch(con, msg); 1425 1426 mutex_lock(&con->mutex); 1427 } 1428 1429 /* 1430 * Atomically queue work on a connection after the specified delay. 1431 * Bump @con reference to avoid races with connection teardown. 1432 * Returns 0 if work was queued, or an error code otherwise. 1433 */ 1434 static int queue_con_delay(struct ceph_connection *con, unsigned long delay) 1435 { 1436 if (!con->ops->get(con)) { 1437 dout("%s %p ref count 0\n", __func__, con); 1438 return -ENOENT; 1439 } 1440 1441 if (delay >= HZ) 1442 delay = round_jiffies_relative(delay); 1443 1444 dout("%s %p %lu\n", __func__, con, delay); 1445 if (!queue_delayed_work(ceph_msgr_wq, &con->work, delay)) { 1446 dout("%s %p - already queued\n", __func__, con); 1447 con->ops->put(con); 1448 return -EBUSY; 1449 } 1450 1451 return 0; 1452 } 1453 1454 static void queue_con(struct ceph_connection *con) 1455 { 1456 (void) queue_con_delay(con, 0); 1457 } 1458 1459 static void cancel_con(struct ceph_connection *con) 1460 { 1461 if (cancel_delayed_work(&con->work)) { 1462 dout("%s %p\n", __func__, con); 1463 con->ops->put(con); 1464 } 1465 } 1466 1467 static bool con_sock_closed(struct ceph_connection *con) 1468 { 1469 if (!ceph_con_flag_test_and_clear(con, CEPH_CON_F_SOCK_CLOSED)) 1470 return false; 1471 1472 #define CASE(x) \ 1473 case CEPH_CON_S_ ## x: \ 1474 con->error_msg = "socket closed (con state " #x ")"; \ 1475 break; 1476 1477 switch (con->state) { 1478 CASE(CLOSED); 1479 CASE(PREOPEN); 1480 CASE(V1_BANNER); 1481 CASE(V1_CONNECT_MSG); 1482 CASE(V2_BANNER_PREFIX); 1483 CASE(V2_BANNER_PAYLOAD); 1484 CASE(V2_HELLO); 1485 CASE(V2_AUTH); 1486 CASE(V2_AUTH_SIGNATURE); 1487 CASE(V2_SESSION_CONNECT); 1488 CASE(V2_SESSION_RECONNECT); 1489 CASE(OPEN); 1490 CASE(STANDBY); 1491 default: 1492 BUG(); 1493 } 1494 #undef CASE 1495 1496 return true; 1497 } 1498 1499 static bool con_backoff(struct ceph_connection *con) 1500 { 1501 int ret; 1502 1503 if (!ceph_con_flag_test_and_clear(con, CEPH_CON_F_BACKOFF)) 1504 return false; 1505 1506 ret = queue_con_delay(con, con->delay); 1507 if (ret) { 1508 dout("%s: con %p FAILED to back off %lu\n", __func__, 1509 con, con->delay); 1510 BUG_ON(ret == -ENOENT); 1511 ceph_con_flag_set(con, CEPH_CON_F_BACKOFF); 1512 } 1513 1514 return true; 1515 } 1516 1517 /* Finish fault handling; con->mutex must *not* be held here */ 1518 1519 static void con_fault_finish(struct ceph_connection *con) 1520 { 1521 dout("%s %p\n", __func__, con); 1522 1523 /* 1524 * in case we faulted due to authentication, invalidate our 1525 * current tickets so that we can get new ones. 1526 */ 1527 if (!ceph_msgr2(from_msgr(con->msgr)) && con->v1.auth_retry) { 1528 dout("auth_retry %d, invalidating\n", con->v1.auth_retry); 1529 if (con->ops->invalidate_authorizer) 1530 con->ops->invalidate_authorizer(con); 1531 con->v1.auth_retry = 0; 1532 } 1533 1534 if (con->ops->fault) 1535 con->ops->fault(con); 1536 } 1537 1538 /* 1539 * Do some work on a connection. Drop a connection ref when we're done. 1540 */ 1541 static void ceph_con_workfn(struct work_struct *work) 1542 { 1543 struct ceph_connection *con = container_of(work, struct ceph_connection, 1544 work.work); 1545 bool fault; 1546 1547 mutex_lock(&con->mutex); 1548 while (true) { 1549 int ret; 1550 1551 if ((fault = con_sock_closed(con))) { 1552 dout("%s: con %p SOCK_CLOSED\n", __func__, con); 1553 break; 1554 } 1555 if (con_backoff(con)) { 1556 dout("%s: con %p BACKOFF\n", __func__, con); 1557 break; 1558 } 1559 if (con->state == CEPH_CON_S_STANDBY) { 1560 dout("%s: con %p STANDBY\n", __func__, con); 1561 break; 1562 } 1563 if (con->state == CEPH_CON_S_CLOSED) { 1564 dout("%s: con %p CLOSED\n", __func__, con); 1565 BUG_ON(con->sock); 1566 break; 1567 } 1568 if (con->state == CEPH_CON_S_PREOPEN) { 1569 dout("%s: con %p PREOPEN\n", __func__, con); 1570 BUG_ON(con->sock); 1571 } 1572 1573 if (ceph_msgr2(from_msgr(con->msgr))) 1574 ret = ceph_con_v2_try_read(con); 1575 else 1576 ret = ceph_con_v1_try_read(con); 1577 if (ret < 0) { 1578 if (ret == -EAGAIN) 1579 continue; 1580 if (!con->error_msg) 1581 con->error_msg = "socket error on read"; 1582 fault = true; 1583 break; 1584 } 1585 1586 if (ceph_msgr2(from_msgr(con->msgr))) 1587 ret = ceph_con_v2_try_write(con); 1588 else 1589 ret = ceph_con_v1_try_write(con); 1590 if (ret < 0) { 1591 if (ret == -EAGAIN) 1592 continue; 1593 if (!con->error_msg) 1594 con->error_msg = "socket error on write"; 1595 fault = true; 1596 } 1597 1598 break; /* If we make it to here, we're done */ 1599 } 1600 if (fault) 1601 con_fault(con); 1602 mutex_unlock(&con->mutex); 1603 1604 if (fault) 1605 con_fault_finish(con); 1606 1607 con->ops->put(con); 1608 } 1609 1610 /* 1611 * Generic error/fault handler. A retry mechanism is used with 1612 * exponential backoff 1613 */ 1614 static void con_fault(struct ceph_connection *con) 1615 { 1616 dout("fault %p state %d to peer %s\n", 1617 con, con->state, ceph_pr_addr(&con->peer_addr)); 1618 1619 pr_warn("%s%lld %s %s\n", ENTITY_NAME(con->peer_name), 1620 ceph_pr_addr(&con->peer_addr), con->error_msg); 1621 con->error_msg = NULL; 1622 1623 WARN_ON(con->state == CEPH_CON_S_STANDBY || 1624 con->state == CEPH_CON_S_CLOSED); 1625 1626 ceph_con_reset_protocol(con); 1627 1628 if (ceph_con_flag_test(con, CEPH_CON_F_LOSSYTX)) { 1629 dout("fault on LOSSYTX channel, marking CLOSED\n"); 1630 con->state = CEPH_CON_S_CLOSED; 1631 return; 1632 } 1633 1634 /* Requeue anything that hasn't been acked */ 1635 list_splice_init(&con->out_sent, &con->out_queue); 1636 1637 /* If there are no messages queued or keepalive pending, place 1638 * the connection in a STANDBY state */ 1639 if (list_empty(&con->out_queue) && 1640 !ceph_con_flag_test(con, CEPH_CON_F_KEEPALIVE_PENDING)) { 1641 dout("fault %p setting STANDBY clearing WRITE_PENDING\n", con); 1642 ceph_con_flag_clear(con, CEPH_CON_F_WRITE_PENDING); 1643 con->state = CEPH_CON_S_STANDBY; 1644 } else { 1645 /* retry after a delay. */ 1646 con->state = CEPH_CON_S_PREOPEN; 1647 if (!con->delay) { 1648 con->delay = BASE_DELAY_INTERVAL; 1649 } else if (con->delay < MAX_DELAY_INTERVAL) { 1650 con->delay *= 2; 1651 if (con->delay > MAX_DELAY_INTERVAL) 1652 con->delay = MAX_DELAY_INTERVAL; 1653 } 1654 ceph_con_flag_set(con, CEPH_CON_F_BACKOFF); 1655 queue_con(con); 1656 } 1657 } 1658 1659 void ceph_messenger_reset_nonce(struct ceph_messenger *msgr) 1660 { 1661 u32 nonce = le32_to_cpu(msgr->inst.addr.nonce) + 1000000; 1662 msgr->inst.addr.nonce = cpu_to_le32(nonce); 1663 ceph_encode_my_addr(msgr); 1664 } 1665 1666 /* 1667 * initialize a new messenger instance 1668 */ 1669 void ceph_messenger_init(struct ceph_messenger *msgr, 1670 struct ceph_entity_addr *myaddr) 1671 { 1672 spin_lock_init(&msgr->global_seq_lock); 1673 1674 if (myaddr) { 1675 memcpy(&msgr->inst.addr.in_addr, &myaddr->in_addr, 1676 sizeof(msgr->inst.addr.in_addr)); 1677 ceph_addr_set_port(&msgr->inst.addr, 0); 1678 } 1679 1680 /* 1681 * Since nautilus, clients are identified using type ANY. 1682 * For msgr1, ceph_encode_banner_addr() munges it to NONE. 1683 */ 1684 msgr->inst.addr.type = CEPH_ENTITY_ADDR_TYPE_ANY; 1685 1686 /* generate a random non-zero nonce */ 1687 do { 1688 get_random_bytes(&msgr->inst.addr.nonce, 1689 sizeof(msgr->inst.addr.nonce)); 1690 } while (!msgr->inst.addr.nonce); 1691 ceph_encode_my_addr(msgr); 1692 1693 atomic_set(&msgr->stopping, 0); 1694 write_pnet(&msgr->net, get_net(current->nsproxy->net_ns)); 1695 1696 dout("%s %p\n", __func__, msgr); 1697 } 1698 1699 void ceph_messenger_fini(struct ceph_messenger *msgr) 1700 { 1701 put_net(read_pnet(&msgr->net)); 1702 } 1703 1704 static void msg_con_set(struct ceph_msg *msg, struct ceph_connection *con) 1705 { 1706 if (msg->con) 1707 msg->con->ops->put(msg->con); 1708 1709 msg->con = con ? con->ops->get(con) : NULL; 1710 BUG_ON(msg->con != con); 1711 } 1712 1713 static void clear_standby(struct ceph_connection *con) 1714 { 1715 /* come back from STANDBY? */ 1716 if (con->state == CEPH_CON_S_STANDBY) { 1717 dout("clear_standby %p\n", con); 1718 con->state = CEPH_CON_S_PREOPEN; 1719 if (!ceph_msgr2(from_msgr(con->msgr))) 1720 con->v1.connect_seq++; 1721 WARN_ON(ceph_con_flag_test(con, CEPH_CON_F_WRITE_PENDING)); 1722 WARN_ON(ceph_con_flag_test(con, CEPH_CON_F_KEEPALIVE_PENDING)); 1723 } 1724 } 1725 1726 /* 1727 * Queue up an outgoing message on the given connection. 1728 * 1729 * Consumes a ref on @msg. 1730 */ 1731 void ceph_con_send(struct ceph_connection *con, struct ceph_msg *msg) 1732 { 1733 /* set src+dst */ 1734 msg->hdr.src = con->msgr->inst.name; 1735 BUG_ON(msg->front.iov_len != le32_to_cpu(msg->hdr.front_len)); 1736 msg->needs_out_seq = true; 1737 1738 mutex_lock(&con->mutex); 1739 1740 if (con->state == CEPH_CON_S_CLOSED) { 1741 dout("con_send %p closed, dropping %p\n", con, msg); 1742 ceph_msg_put(msg); 1743 mutex_unlock(&con->mutex); 1744 return; 1745 } 1746 1747 msg_con_set(msg, con); 1748 1749 BUG_ON(!list_empty(&msg->list_head)); 1750 list_add_tail(&msg->list_head, &con->out_queue); 1751 dout("----- %p to %s%lld %d=%s len %d+%d+%d -----\n", msg, 1752 ENTITY_NAME(con->peer_name), le16_to_cpu(msg->hdr.type), 1753 ceph_msg_type_name(le16_to_cpu(msg->hdr.type)), 1754 le32_to_cpu(msg->hdr.front_len), 1755 le32_to_cpu(msg->hdr.middle_len), 1756 le32_to_cpu(msg->hdr.data_len)); 1757 1758 clear_standby(con); 1759 mutex_unlock(&con->mutex); 1760 1761 /* if there wasn't anything waiting to send before, queue 1762 * new work */ 1763 if (!ceph_con_flag_test_and_set(con, CEPH_CON_F_WRITE_PENDING)) 1764 queue_con(con); 1765 } 1766 EXPORT_SYMBOL(ceph_con_send); 1767 1768 /* 1769 * Revoke a message that was previously queued for send 1770 */ 1771 void ceph_msg_revoke(struct ceph_msg *msg) 1772 { 1773 struct ceph_connection *con = msg->con; 1774 1775 if (!con) { 1776 dout("%s msg %p null con\n", __func__, msg); 1777 return; /* Message not in our possession */ 1778 } 1779 1780 mutex_lock(&con->mutex); 1781 if (list_empty(&msg->list_head)) { 1782 WARN_ON(con->out_msg == msg); 1783 dout("%s con %p msg %p not linked\n", __func__, con, msg); 1784 mutex_unlock(&con->mutex); 1785 return; 1786 } 1787 1788 dout("%s con %p msg %p was linked\n", __func__, con, msg); 1789 msg->hdr.seq = 0; 1790 ceph_msg_remove(msg); 1791 1792 if (con->out_msg == msg) { 1793 WARN_ON(con->state != CEPH_CON_S_OPEN); 1794 dout("%s con %p msg %p was sending\n", __func__, con, msg); 1795 if (ceph_msgr2(from_msgr(con->msgr))) 1796 ceph_con_v2_revoke(con, msg); 1797 else 1798 ceph_con_v1_revoke(con, msg); 1799 ceph_msg_put(con->out_msg); 1800 con->out_msg = NULL; 1801 } else { 1802 dout("%s con %p msg %p not current, out_msg %p\n", __func__, 1803 con, msg, con->out_msg); 1804 } 1805 mutex_unlock(&con->mutex); 1806 } 1807 1808 /* 1809 * Revoke a message that we may be reading data into 1810 */ 1811 void ceph_msg_revoke_incoming(struct ceph_msg *msg) 1812 { 1813 struct ceph_connection *con = msg->con; 1814 1815 if (!con) { 1816 dout("%s msg %p null con\n", __func__, msg); 1817 return; /* Message not in our possession */ 1818 } 1819 1820 mutex_lock(&con->mutex); 1821 if (con->in_msg == msg) { 1822 WARN_ON(con->state != CEPH_CON_S_OPEN); 1823 dout("%s con %p msg %p was recving\n", __func__, con, msg); 1824 if (ceph_msgr2(from_msgr(con->msgr))) 1825 ceph_con_v2_revoke_incoming(con); 1826 else 1827 ceph_con_v1_revoke_incoming(con); 1828 ceph_msg_put(con->in_msg); 1829 con->in_msg = NULL; 1830 } else { 1831 dout("%s con %p msg %p not current, in_msg %p\n", __func__, 1832 con, msg, con->in_msg); 1833 } 1834 mutex_unlock(&con->mutex); 1835 } 1836 1837 /* 1838 * Queue a keepalive byte to ensure the tcp connection is alive. 1839 */ 1840 void ceph_con_keepalive(struct ceph_connection *con) 1841 { 1842 dout("con_keepalive %p\n", con); 1843 mutex_lock(&con->mutex); 1844 clear_standby(con); 1845 ceph_con_flag_set(con, CEPH_CON_F_KEEPALIVE_PENDING); 1846 mutex_unlock(&con->mutex); 1847 1848 if (!ceph_con_flag_test_and_set(con, CEPH_CON_F_WRITE_PENDING)) 1849 queue_con(con); 1850 } 1851 EXPORT_SYMBOL(ceph_con_keepalive); 1852 1853 bool ceph_con_keepalive_expired(struct ceph_connection *con, 1854 unsigned long interval) 1855 { 1856 if (interval > 0 && 1857 (con->peer_features & CEPH_FEATURE_MSGR_KEEPALIVE2)) { 1858 struct timespec64 now; 1859 struct timespec64 ts; 1860 ktime_get_real_ts64(&now); 1861 jiffies_to_timespec64(interval, &ts); 1862 ts = timespec64_add(con->last_keepalive_ack, ts); 1863 return timespec64_compare(&now, &ts) >= 0; 1864 } 1865 return false; 1866 } 1867 1868 static struct ceph_msg_data *ceph_msg_data_add(struct ceph_msg *msg) 1869 { 1870 BUG_ON(msg->num_data_items >= msg->max_data_items); 1871 return &msg->data[msg->num_data_items++]; 1872 } 1873 1874 static void ceph_msg_data_destroy(struct ceph_msg_data *data) 1875 { 1876 if (data->type == CEPH_MSG_DATA_PAGES && data->own_pages) { 1877 int num_pages = calc_pages_for(data->alignment, data->length); 1878 ceph_release_page_vector(data->pages, num_pages); 1879 } else if (data->type == CEPH_MSG_DATA_PAGELIST) { 1880 ceph_pagelist_release(data->pagelist); 1881 } 1882 } 1883 1884 void ceph_msg_data_add_pages(struct ceph_msg *msg, struct page **pages, 1885 size_t length, size_t alignment, bool own_pages) 1886 { 1887 struct ceph_msg_data *data; 1888 1889 BUG_ON(!pages); 1890 BUG_ON(!length); 1891 1892 data = ceph_msg_data_add(msg); 1893 data->type = CEPH_MSG_DATA_PAGES; 1894 data->pages = pages; 1895 data->length = length; 1896 data->alignment = alignment & ~PAGE_MASK; 1897 data->own_pages = own_pages; 1898 1899 msg->data_length += length; 1900 } 1901 EXPORT_SYMBOL(ceph_msg_data_add_pages); 1902 1903 void ceph_msg_data_add_pagelist(struct ceph_msg *msg, 1904 struct ceph_pagelist *pagelist) 1905 { 1906 struct ceph_msg_data *data; 1907 1908 BUG_ON(!pagelist); 1909 BUG_ON(!pagelist->length); 1910 1911 data = ceph_msg_data_add(msg); 1912 data->type = CEPH_MSG_DATA_PAGELIST; 1913 refcount_inc(&pagelist->refcnt); 1914 data->pagelist = pagelist; 1915 1916 msg->data_length += pagelist->length; 1917 } 1918 EXPORT_SYMBOL(ceph_msg_data_add_pagelist); 1919 1920 #ifdef CONFIG_BLOCK 1921 void ceph_msg_data_add_bio(struct ceph_msg *msg, struct ceph_bio_iter *bio_pos, 1922 u32 length) 1923 { 1924 struct ceph_msg_data *data; 1925 1926 data = ceph_msg_data_add(msg); 1927 data->type = CEPH_MSG_DATA_BIO; 1928 data->bio_pos = *bio_pos; 1929 data->bio_length = length; 1930 1931 msg->data_length += length; 1932 } 1933 EXPORT_SYMBOL(ceph_msg_data_add_bio); 1934 #endif /* CONFIG_BLOCK */ 1935 1936 void ceph_msg_data_add_bvecs(struct ceph_msg *msg, 1937 struct ceph_bvec_iter *bvec_pos) 1938 { 1939 struct ceph_msg_data *data; 1940 1941 data = ceph_msg_data_add(msg); 1942 data->type = CEPH_MSG_DATA_BVECS; 1943 data->bvec_pos = *bvec_pos; 1944 1945 msg->data_length += bvec_pos->iter.bi_size; 1946 } 1947 EXPORT_SYMBOL(ceph_msg_data_add_bvecs); 1948 1949 void ceph_msg_data_add_iter(struct ceph_msg *msg, 1950 struct iov_iter *iter) 1951 { 1952 struct ceph_msg_data *data; 1953 1954 data = ceph_msg_data_add(msg); 1955 data->type = CEPH_MSG_DATA_ITER; 1956 data->iter = *iter; 1957 1958 msg->data_length += iov_iter_count(&data->iter); 1959 } 1960 1961 /* 1962 * construct a new message with given type, size 1963 * the new msg has a ref count of 1. 1964 */ 1965 struct ceph_msg *ceph_msg_new2(int type, int front_len, int max_data_items, 1966 gfp_t flags, bool can_fail) 1967 { 1968 struct ceph_msg *m; 1969 1970 m = kmem_cache_zalloc(ceph_msg_cache, flags); 1971 if (m == NULL) 1972 goto out; 1973 1974 m->hdr.type = cpu_to_le16(type); 1975 m->hdr.priority = cpu_to_le16(CEPH_MSG_PRIO_DEFAULT); 1976 m->hdr.front_len = cpu_to_le32(front_len); 1977 1978 INIT_LIST_HEAD(&m->list_head); 1979 kref_init(&m->kref); 1980 1981 /* front */ 1982 if (front_len) { 1983 m->front.iov_base = kvmalloc(front_len, flags); 1984 if (m->front.iov_base == NULL) { 1985 dout("ceph_msg_new can't allocate %d bytes\n", 1986 front_len); 1987 goto out2; 1988 } 1989 } else { 1990 m->front.iov_base = NULL; 1991 } 1992 m->front_alloc_len = m->front.iov_len = front_len; 1993 1994 if (max_data_items) { 1995 m->data = kmalloc_objs(*m->data, max_data_items, flags); 1996 if (!m->data) 1997 goto out2; 1998 1999 m->max_data_items = max_data_items; 2000 } 2001 2002 dout("ceph_msg_new %p front %d\n", m, front_len); 2003 return m; 2004 2005 out2: 2006 ceph_msg_put(m); 2007 out: 2008 if (!can_fail) { 2009 pr_err("msg_new can't create type %d front %d\n", type, 2010 front_len); 2011 WARN_ON(1); 2012 } else { 2013 dout("msg_new can't create type %d front %d\n", type, 2014 front_len); 2015 } 2016 return NULL; 2017 } 2018 EXPORT_SYMBOL(ceph_msg_new2); 2019 2020 struct ceph_msg *ceph_msg_new(int type, int front_len, gfp_t flags, 2021 bool can_fail) 2022 { 2023 return ceph_msg_new2(type, front_len, 0, flags, can_fail); 2024 } 2025 EXPORT_SYMBOL(ceph_msg_new); 2026 2027 /* 2028 * Allocate "middle" portion of a message, if it is needed and wasn't 2029 * allocated by alloc_msg. This allows us to read a small fixed-size 2030 * per-type header in the front and then gracefully fail (i.e., 2031 * propagate the error to the caller based on info in the front) when 2032 * the middle is too large. 2033 */ 2034 static int ceph_alloc_middle(struct ceph_connection *con, struct ceph_msg *msg) 2035 { 2036 int type = le16_to_cpu(msg->hdr.type); 2037 int middle_len = le32_to_cpu(msg->hdr.middle_len); 2038 2039 dout("alloc_middle %p type %d %s middle_len %d\n", msg, type, 2040 ceph_msg_type_name(type), middle_len); 2041 BUG_ON(!middle_len); 2042 BUG_ON(msg->middle); 2043 2044 msg->middle = ceph_buffer_new(middle_len, GFP_NOFS); 2045 if (!msg->middle) 2046 return -ENOMEM; 2047 return 0; 2048 } 2049 2050 /* 2051 * Allocate a message for receiving an incoming message on a 2052 * connection, and save the result in con->in_msg. Uses the 2053 * connection's private alloc_msg op if available. 2054 * 2055 * Returns 0 on success, or a negative error code. 2056 * 2057 * On success, if we set *skip = 1: 2058 * - the next message should be skipped and ignored. 2059 * - con->in_msg == NULL 2060 * or if we set *skip = 0: 2061 * - con->in_msg is non-null. 2062 * On error (ENOMEM, EAGAIN, ...), 2063 * - con->in_msg == NULL 2064 */ 2065 int ceph_con_in_msg_alloc(struct ceph_connection *con, 2066 struct ceph_msg_header *hdr, int *skip) 2067 { 2068 int middle_len = le32_to_cpu(hdr->middle_len); 2069 struct ceph_msg *msg; 2070 int ret = 0; 2071 2072 BUG_ON(con->in_msg != NULL); 2073 BUG_ON(!con->ops->alloc_msg); 2074 2075 mutex_unlock(&con->mutex); 2076 msg = con->ops->alloc_msg(con, hdr, skip); 2077 mutex_lock(&con->mutex); 2078 if (con->state != CEPH_CON_S_OPEN) { 2079 if (msg) 2080 ceph_msg_put(msg); 2081 return -EAGAIN; 2082 } 2083 if (msg) { 2084 BUG_ON(*skip); 2085 msg_con_set(msg, con); 2086 con->in_msg = msg; 2087 } else { 2088 /* 2089 * Null message pointer means either we should skip 2090 * this message or we couldn't allocate memory. The 2091 * former is not an error. 2092 */ 2093 if (*skip) 2094 return 0; 2095 2096 con->error_msg = "error allocating memory for incoming message"; 2097 return -ENOMEM; 2098 } 2099 memcpy(&con->in_msg->hdr, hdr, sizeof(*hdr)); 2100 2101 if (middle_len && !con->in_msg->middle) { 2102 ret = ceph_alloc_middle(con, con->in_msg); 2103 if (ret < 0) { 2104 ceph_msg_put(con->in_msg); 2105 con->in_msg = NULL; 2106 } 2107 } 2108 2109 return ret; 2110 } 2111 2112 struct ceph_msg *ceph_con_get_out_msg(struct ceph_connection *con) 2113 { 2114 struct ceph_msg *msg; 2115 2116 if (list_empty(&con->out_queue)) 2117 return NULL; 2118 2119 msg = list_first_entry(&con->out_queue, struct ceph_msg, list_head); 2120 WARN_ON(msg->con != con); 2121 2122 /* 2123 * Put the message on "sent" list using a ref from ceph_con_send(). 2124 * It is put when the message is acked or revoked. 2125 */ 2126 list_move_tail(&msg->list_head, &con->out_sent); 2127 2128 /* 2129 * Only assign outgoing seq # if we haven't sent this message 2130 * yet. If it is requeued, resend with it's original seq. 2131 */ 2132 if (msg->needs_out_seq) { 2133 msg->hdr.seq = cpu_to_le64(++con->out_seq); 2134 msg->needs_out_seq = false; 2135 2136 if (con->ops->reencode_message) 2137 con->ops->reencode_message(msg); 2138 } 2139 2140 /* 2141 * Get a ref for out_msg. It is put when we are done sending the 2142 * message or in case of a fault. 2143 */ 2144 WARN_ON(con->out_msg); 2145 return con->out_msg = ceph_msg_get(msg); 2146 } 2147 2148 /* 2149 * Free a generically kmalloc'd message. 2150 */ 2151 static void ceph_msg_free(struct ceph_msg *m) 2152 { 2153 dout("%s %p\n", __func__, m); 2154 kvfree(m->front.iov_base); 2155 kfree(m->data); 2156 kmem_cache_free(ceph_msg_cache, m); 2157 } 2158 2159 static void ceph_msg_release(struct kref *kref) 2160 { 2161 struct ceph_msg *m = container_of(kref, struct ceph_msg, kref); 2162 int i; 2163 2164 dout("%s %p\n", __func__, m); 2165 WARN_ON(!list_empty(&m->list_head)); 2166 2167 msg_con_set(m, NULL); 2168 2169 /* drop middle, data, if any */ 2170 if (m->middle) { 2171 ceph_buffer_put(m->middle); 2172 m->middle = NULL; 2173 } 2174 2175 for (i = 0; i < m->num_data_items; i++) 2176 ceph_msg_data_destroy(&m->data[i]); 2177 2178 if (m->pool) 2179 ceph_msgpool_put(m->pool, m); 2180 else 2181 ceph_msg_free(m); 2182 } 2183 2184 struct ceph_msg *ceph_msg_get(struct ceph_msg *msg) 2185 { 2186 dout("%s %p (was %d)\n", __func__, msg, 2187 kref_read(&msg->kref)); 2188 kref_get(&msg->kref); 2189 return msg; 2190 } 2191 EXPORT_SYMBOL(ceph_msg_get); 2192 2193 void ceph_msg_put(struct ceph_msg *msg) 2194 { 2195 dout("%s %p (was %d)\n", __func__, msg, 2196 kref_read(&msg->kref)); 2197 kref_put(&msg->kref, ceph_msg_release); 2198 } 2199 EXPORT_SYMBOL(ceph_msg_put); 2200 2201 void ceph_msg_dump(struct ceph_msg *msg) 2202 { 2203 pr_debug("msg_dump %p (front_alloc_len %d length %zd)\n", msg, 2204 msg->front_alloc_len, msg->data_length); 2205 print_hex_dump(KERN_DEBUG, "header: ", 2206 DUMP_PREFIX_OFFSET, 16, 1, 2207 &msg->hdr, sizeof(msg->hdr), true); 2208 print_hex_dump(KERN_DEBUG, " front: ", 2209 DUMP_PREFIX_OFFSET, 16, 1, 2210 msg->front.iov_base, msg->front.iov_len, true); 2211 if (msg->middle) 2212 print_hex_dump(KERN_DEBUG, "middle: ", 2213 DUMP_PREFIX_OFFSET, 16, 1, 2214 msg->middle->vec.iov_base, 2215 msg->middle->vec.iov_len, true); 2216 print_hex_dump(KERN_DEBUG, "footer: ", 2217 DUMP_PREFIX_OFFSET, 16, 1, 2218 &msg->footer, sizeof(msg->footer), true); 2219 } 2220 EXPORT_SYMBOL(ceph_msg_dump); 2221