mon_client.c revision ec87ef4309d33bd9c87a53bb5152a86ae7a65f25
1#include <linux/ceph/ceph_debug.h> 2 3#include <linux/module.h> 4#include <linux/types.h> 5#include <linux/slab.h> 6#include <linux/random.h> 7#include <linux/sched.h> 8 9#include <linux/ceph/mon_client.h> 10#include <linux/ceph/libceph.h> 11#include <linux/ceph/debugfs.h> 12#include <linux/ceph/decode.h> 13#include <linux/ceph/auth.h> 14 15/* 16 * Interact with Ceph monitor cluster. Handle requests for new map 17 * versions, and periodically resend as needed. Also implement 18 * statfs() and umount(). 19 * 20 * A small cluster of Ceph "monitors" are responsible for managing critical 21 * cluster configuration and state information. An odd number (e.g., 3, 5) 22 * of cmon daemons use a modified version of the Paxos part-time parliament 23 * algorithm to manage the MDS map (mds cluster membership), OSD map, and 24 * list of clients who have mounted the file system. 25 * 26 * We maintain an open, active session with a monitor at all times in order to 27 * receive timely MDSMap updates. We periodically send a keepalive byte on the 28 * TCP socket to ensure we detect a failure. If the connection does break, we 29 * randomly hunt for a new monitor. Once the connection is reestablished, we 30 * resend any outstanding requests. 31 */ 32 33static const struct ceph_connection_operations mon_con_ops; 34 35static int __validate_auth(struct ceph_mon_client *monc); 36 37/* 38 * Decode a monmap blob (e.g., during mount). 39 */ 40struct ceph_monmap *ceph_monmap_decode(void *p, void *end) 41{ 42 struct ceph_monmap *m = NULL; 43 int i, err = -EINVAL; 44 struct ceph_fsid fsid; 45 u32 epoch, num_mon; 46 u16 version; 47 u32 len; 48 49 ceph_decode_32_safe(&p, end, len, bad); 50 ceph_decode_need(&p, end, len, bad); 51 52 dout("monmap_decode %p %p len %d\n", p, end, (int)(end-p)); 53 54 ceph_decode_16_safe(&p, end, version, bad); 55 56 ceph_decode_need(&p, end, sizeof(fsid) + 2*sizeof(u32), bad); 57 ceph_decode_copy(&p, &fsid, sizeof(fsid)); 58 epoch = ceph_decode_32(&p); 59 60 num_mon = ceph_decode_32(&p); 61 ceph_decode_need(&p, end, num_mon*sizeof(m->mon_inst[0]), bad); 62 63 if (num_mon >= CEPH_MAX_MON) 64 goto bad; 65 m = kmalloc(sizeof(*m) + sizeof(m->mon_inst[0])*num_mon, GFP_NOFS); 66 if (m == NULL) 67 return ERR_PTR(-ENOMEM); 68 m->fsid = fsid; 69 m->epoch = epoch; 70 m->num_mon = num_mon; 71 ceph_decode_copy(&p, m->mon_inst, num_mon*sizeof(m->mon_inst[0])); 72 for (i = 0; i < num_mon; i++) 73 ceph_decode_addr(&m->mon_inst[i].addr); 74 75 dout("monmap_decode epoch %d, num_mon %d\n", m->epoch, 76 m->num_mon); 77 for (i = 0; i < m->num_mon; i++) 78 dout("monmap_decode mon%d is %s\n", i, 79 ceph_pr_addr(&m->mon_inst[i].addr.in_addr)); 80 return m; 81 82bad: 83 dout("monmap_decode failed with %d\n", err); 84 kfree(m); 85 return ERR_PTR(err); 86} 87 88/* 89 * return true if *addr is included in the monmap. 90 */ 91int ceph_monmap_contains(struct ceph_monmap *m, struct ceph_entity_addr *addr) 92{ 93 int i; 94 95 for (i = 0; i < m->num_mon; i++) 96 if (memcmp(addr, &m->mon_inst[i].addr, sizeof(*addr)) == 0) 97 return 1; 98 return 0; 99} 100 101/* 102 * Send an auth request. 103 */ 104static void __send_prepared_auth_request(struct ceph_mon_client *monc, int len) 105{ 106 monc->pending_auth = 1; 107 monc->m_auth->front.iov_len = len; 108 monc->m_auth->hdr.front_len = cpu_to_le32(len); 109 ceph_con_revoke(&monc->con, monc->m_auth); 110 ceph_msg_get(monc->m_auth); /* keep our ref */ 111 ceph_con_send(&monc->con, monc->m_auth); 112} 113 114/* 115 * Close monitor session, if any. 116 */ 117static void __close_session(struct ceph_mon_client *monc) 118{ 119 dout("__close_session closing mon%d\n", monc->cur_mon); 120 ceph_con_revoke(&monc->con, monc->m_auth); 121 ceph_con_close(&monc->con); 122 monc->cur_mon = -1; 123 monc->pending_auth = 0; 124 ceph_auth_reset(monc->auth); 125} 126 127/* 128 * Open a session with a (new) monitor. 129 */ 130static int __open_session(struct ceph_mon_client *monc) 131{ 132 char r; 133 int ret; 134 135 if (monc->cur_mon < 0) { 136 get_random_bytes(&r, 1); 137 monc->cur_mon = r % monc->monmap->num_mon; 138 dout("open_session num=%d r=%d -> mon%d\n", 139 monc->monmap->num_mon, r, monc->cur_mon); 140 monc->sub_sent = 0; 141 monc->sub_renew_after = jiffies; /* i.e., expired */ 142 monc->want_next_osdmap = !!monc->want_next_osdmap; 143 144 dout("open_session mon%d opening\n", monc->cur_mon); 145 monc->con.peer_name.type = CEPH_ENTITY_TYPE_MON; 146 monc->con.peer_name.num = cpu_to_le64(monc->cur_mon); 147 ceph_con_open(&monc->con, 148 &monc->monmap->mon_inst[monc->cur_mon].addr); 149 150 /* initiatiate authentication handshake */ 151 ret = ceph_auth_build_hello(monc->auth, 152 monc->m_auth->front.iov_base, 153 monc->m_auth->front_max); 154 __send_prepared_auth_request(monc, ret); 155 } else { 156 dout("open_session mon%d already open\n", monc->cur_mon); 157 } 158 return 0; 159} 160 161static bool __sub_expired(struct ceph_mon_client *monc) 162{ 163 return time_after_eq(jiffies, monc->sub_renew_after); 164} 165 166/* 167 * Reschedule delayed work timer. 168 */ 169static void __schedule_delayed(struct ceph_mon_client *monc) 170{ 171 unsigned delay; 172 173 if (monc->cur_mon < 0 || __sub_expired(monc)) 174 delay = 10 * HZ; 175 else 176 delay = 20 * HZ; 177 dout("__schedule_delayed after %u\n", delay); 178 schedule_delayed_work(&monc->delayed_work, delay); 179} 180 181/* 182 * Send subscribe request for mdsmap and/or osdmap. 183 */ 184static void __send_subscribe(struct ceph_mon_client *monc) 185{ 186 dout("__send_subscribe sub_sent=%u exp=%u want_osd=%d\n", 187 (unsigned)monc->sub_sent, __sub_expired(monc), 188 monc->want_next_osdmap); 189 if ((__sub_expired(monc) && !monc->sub_sent) || 190 monc->want_next_osdmap == 1) { 191 struct ceph_msg *msg = monc->m_subscribe; 192 struct ceph_mon_subscribe_item *i; 193 void *p, *end; 194 int num; 195 196 p = msg->front.iov_base; 197 end = p + msg->front_max; 198 199 num = 1 + !!monc->want_next_osdmap + !!monc->want_mdsmap; 200 ceph_encode_32(&p, num); 201 202 if (monc->want_next_osdmap) { 203 dout("__send_subscribe to 'osdmap' %u\n", 204 (unsigned)monc->have_osdmap); 205 ceph_encode_string(&p, end, "osdmap", 6); 206 i = p; 207 i->have = cpu_to_le64(monc->have_osdmap); 208 i->onetime = 1; 209 p += sizeof(*i); 210 monc->want_next_osdmap = 2; /* requested */ 211 } 212 if (monc->want_mdsmap) { 213 dout("__send_subscribe to 'mdsmap' %u+\n", 214 (unsigned)monc->have_mdsmap); 215 ceph_encode_string(&p, end, "mdsmap", 6); 216 i = p; 217 i->have = cpu_to_le64(monc->have_mdsmap); 218 i->onetime = 0; 219 p += sizeof(*i); 220 } 221 ceph_encode_string(&p, end, "monmap", 6); 222 i = p; 223 i->have = 0; 224 i->onetime = 0; 225 p += sizeof(*i); 226 227 msg->front.iov_len = p - msg->front.iov_base; 228 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len); 229 ceph_con_revoke(&monc->con, msg); 230 ceph_con_send(&monc->con, ceph_msg_get(msg)); 231 232 monc->sub_sent = jiffies | 1; /* never 0 */ 233 } 234} 235 236static void handle_subscribe_ack(struct ceph_mon_client *monc, 237 struct ceph_msg *msg) 238{ 239 unsigned seconds; 240 struct ceph_mon_subscribe_ack *h = msg->front.iov_base; 241 242 if (msg->front.iov_len < sizeof(*h)) 243 goto bad; 244 seconds = le32_to_cpu(h->duration); 245 246 mutex_lock(&monc->mutex); 247 if (monc->hunting) { 248 pr_info("mon%d %s session established\n", 249 monc->cur_mon, 250 ceph_pr_addr(&monc->con.peer_addr.in_addr)); 251 monc->hunting = false; 252 } 253 dout("handle_subscribe_ack after %d seconds\n", seconds); 254 monc->sub_renew_after = monc->sub_sent + (seconds >> 1)*HZ - 1; 255 monc->sub_sent = 0; 256 mutex_unlock(&monc->mutex); 257 return; 258bad: 259 pr_err("got corrupt subscribe-ack msg\n"); 260 ceph_msg_dump(msg); 261} 262 263/* 264 * Keep track of which maps we have 265 */ 266int ceph_monc_got_mdsmap(struct ceph_mon_client *monc, u32 got) 267{ 268 mutex_lock(&monc->mutex); 269 monc->have_mdsmap = got; 270 mutex_unlock(&monc->mutex); 271 return 0; 272} 273EXPORT_SYMBOL(ceph_monc_got_mdsmap); 274 275int ceph_monc_got_osdmap(struct ceph_mon_client *monc, u32 got) 276{ 277 mutex_lock(&monc->mutex); 278 monc->have_osdmap = got; 279 monc->want_next_osdmap = 0; 280 mutex_unlock(&monc->mutex); 281 return 0; 282} 283 284/* 285 * Register interest in the next osdmap 286 */ 287void ceph_monc_request_next_osdmap(struct ceph_mon_client *monc) 288{ 289 dout("request_next_osdmap have %u\n", monc->have_osdmap); 290 mutex_lock(&monc->mutex); 291 if (!monc->want_next_osdmap) 292 monc->want_next_osdmap = 1; 293 if (monc->want_next_osdmap < 2) 294 __send_subscribe(monc); 295 mutex_unlock(&monc->mutex); 296} 297 298/* 299 * 300 */ 301int ceph_monc_open_session(struct ceph_mon_client *monc) 302{ 303 mutex_lock(&monc->mutex); 304 __open_session(monc); 305 __schedule_delayed(monc); 306 mutex_unlock(&monc->mutex); 307 return 0; 308} 309EXPORT_SYMBOL(ceph_monc_open_session); 310 311/* 312 * The monitor responds with mount ack indicate mount success. The 313 * included client ticket allows the client to talk to MDSs and OSDs. 314 */ 315static void ceph_monc_handle_map(struct ceph_mon_client *monc, 316 struct ceph_msg *msg) 317{ 318 struct ceph_client *client = monc->client; 319 struct ceph_monmap *monmap = NULL, *old = monc->monmap; 320 void *p, *end; 321 322 mutex_lock(&monc->mutex); 323 324 dout("handle_monmap\n"); 325 p = msg->front.iov_base; 326 end = p + msg->front.iov_len; 327 328 monmap = ceph_monmap_decode(p, end); 329 if (IS_ERR(monmap)) { 330 pr_err("problem decoding monmap, %d\n", 331 (int)PTR_ERR(monmap)); 332 goto out; 333 } 334 335 if (ceph_check_fsid(monc->client, &monmap->fsid) < 0) { 336 kfree(monmap); 337 goto out; 338 } 339 340 client->monc.monmap = monmap; 341 kfree(old); 342 343 if (!client->have_fsid) { 344 client->have_fsid = true; 345 mutex_unlock(&monc->mutex); 346 /* 347 * do debugfs initialization without mutex to avoid 348 * creating a locking dependency 349 */ 350 ceph_debugfs_client_init(client); 351 goto out_unlocked; 352 } 353out: 354 mutex_unlock(&monc->mutex); 355out_unlocked: 356 wake_up_all(&client->auth_wq); 357} 358 359/* 360 * generic requests (e.g., statfs, poolop) 361 */ 362static struct ceph_mon_generic_request *__lookup_generic_req( 363 struct ceph_mon_client *monc, u64 tid) 364{ 365 struct ceph_mon_generic_request *req; 366 struct rb_node *n = monc->generic_request_tree.rb_node; 367 368 while (n) { 369 req = rb_entry(n, struct ceph_mon_generic_request, node); 370 if (tid < req->tid) 371 n = n->rb_left; 372 else if (tid > req->tid) 373 n = n->rb_right; 374 else 375 return req; 376 } 377 return NULL; 378} 379 380static void __insert_generic_request(struct ceph_mon_client *monc, 381 struct ceph_mon_generic_request *new) 382{ 383 struct rb_node **p = &monc->generic_request_tree.rb_node; 384 struct rb_node *parent = NULL; 385 struct ceph_mon_generic_request *req = NULL; 386 387 while (*p) { 388 parent = *p; 389 req = rb_entry(parent, struct ceph_mon_generic_request, node); 390 if (new->tid < req->tid) 391 p = &(*p)->rb_left; 392 else if (new->tid > req->tid) 393 p = &(*p)->rb_right; 394 else 395 BUG(); 396 } 397 398 rb_link_node(&new->node, parent, p); 399 rb_insert_color(&new->node, &monc->generic_request_tree); 400} 401 402static void release_generic_request(struct kref *kref) 403{ 404 struct ceph_mon_generic_request *req = 405 container_of(kref, struct ceph_mon_generic_request, kref); 406 407 if (req->reply) 408 ceph_msg_put(req->reply); 409 if (req->request) 410 ceph_msg_put(req->request); 411 412 kfree(req); 413} 414 415static void put_generic_request(struct ceph_mon_generic_request *req) 416{ 417 kref_put(&req->kref, release_generic_request); 418} 419 420static void get_generic_request(struct ceph_mon_generic_request *req) 421{ 422 kref_get(&req->kref); 423} 424 425static struct ceph_msg *get_generic_reply(struct ceph_connection *con, 426 struct ceph_msg_header *hdr, 427 int *skip) 428{ 429 struct ceph_mon_client *monc = con->private; 430 struct ceph_mon_generic_request *req; 431 u64 tid = le64_to_cpu(hdr->tid); 432 struct ceph_msg *m; 433 434 mutex_lock(&monc->mutex); 435 req = __lookup_generic_req(monc, tid); 436 if (!req) { 437 dout("get_generic_reply %lld dne\n", tid); 438 *skip = 1; 439 m = NULL; 440 } else { 441 dout("get_generic_reply %lld got %p\n", tid, req->reply); 442 m = ceph_msg_get(req->reply); 443 /* 444 * we don't need to track the connection reading into 445 * this reply because we only have one open connection 446 * at a time, ever. 447 */ 448 } 449 mutex_unlock(&monc->mutex); 450 return m; 451} 452 453static int do_generic_request(struct ceph_mon_client *monc, 454 struct ceph_mon_generic_request *req) 455{ 456 int err; 457 458 /* register request */ 459 mutex_lock(&monc->mutex); 460 req->tid = ++monc->last_tid; 461 req->request->hdr.tid = cpu_to_le64(req->tid); 462 __insert_generic_request(monc, req); 463 monc->num_generic_requests++; 464 ceph_con_send(&monc->con, ceph_msg_get(req->request)); 465 mutex_unlock(&monc->mutex); 466 467 err = wait_for_completion_interruptible(&req->completion); 468 469 mutex_lock(&monc->mutex); 470 rb_erase(&req->node, &monc->generic_request_tree); 471 monc->num_generic_requests--; 472 mutex_unlock(&monc->mutex); 473 474 if (!err) 475 err = req->result; 476 return err; 477} 478 479/* 480 * statfs 481 */ 482static void handle_statfs_reply(struct ceph_mon_client *monc, 483 struct ceph_msg *msg) 484{ 485 struct ceph_mon_generic_request *req; 486 struct ceph_mon_statfs_reply *reply = msg->front.iov_base; 487 u64 tid = le64_to_cpu(msg->hdr.tid); 488 489 if (msg->front.iov_len != sizeof(*reply)) 490 goto bad; 491 dout("handle_statfs_reply %p tid %llu\n", msg, tid); 492 493 mutex_lock(&monc->mutex); 494 req = __lookup_generic_req(monc, tid); 495 if (req) { 496 *(struct ceph_statfs *)req->buf = reply->st; 497 req->result = 0; 498 get_generic_request(req); 499 } 500 mutex_unlock(&monc->mutex); 501 if (req) { 502 complete_all(&req->completion); 503 put_generic_request(req); 504 } 505 return; 506 507bad: 508 pr_err("corrupt generic reply, tid %llu\n", tid); 509 ceph_msg_dump(msg); 510} 511 512/* 513 * Do a synchronous statfs(). 514 */ 515int ceph_monc_do_statfs(struct ceph_mon_client *monc, struct ceph_statfs *buf) 516{ 517 struct ceph_mon_generic_request *req; 518 struct ceph_mon_statfs *h; 519 int err; 520 521 req = kzalloc(sizeof(*req), GFP_NOFS); 522 if (!req) 523 return -ENOMEM; 524 525 kref_init(&req->kref); 526 req->buf = buf; 527 req->buf_len = sizeof(*buf); 528 init_completion(&req->completion); 529 530 err = -ENOMEM; 531 req->request = ceph_msg_new(CEPH_MSG_STATFS, sizeof(*h), GFP_NOFS, 532 true); 533 if (!req->request) 534 goto out; 535 req->reply = ceph_msg_new(CEPH_MSG_STATFS_REPLY, 1024, GFP_NOFS, 536 true); 537 if (!req->reply) 538 goto out; 539 540 /* fill out request */ 541 h = req->request->front.iov_base; 542 h->monhdr.have_version = 0; 543 h->monhdr.session_mon = cpu_to_le16(-1); 544 h->monhdr.session_mon_tid = 0; 545 h->fsid = monc->monmap->fsid; 546 547 err = do_generic_request(monc, req); 548 549out: 550 kref_put(&req->kref, release_generic_request); 551 return err; 552} 553EXPORT_SYMBOL(ceph_monc_do_statfs); 554 555/* 556 * pool ops 557 */ 558static int get_poolop_reply_buf(const char *src, size_t src_len, 559 char *dst, size_t dst_len) 560{ 561 u32 buf_len; 562 563 if (src_len != sizeof(u32) + dst_len) 564 return -EINVAL; 565 566 buf_len = le32_to_cpu(*(u32 *)src); 567 if (buf_len != dst_len) 568 return -EINVAL; 569 570 memcpy(dst, src + sizeof(u32), dst_len); 571 return 0; 572} 573 574static void handle_poolop_reply(struct ceph_mon_client *monc, 575 struct ceph_msg *msg) 576{ 577 struct ceph_mon_generic_request *req; 578 struct ceph_mon_poolop_reply *reply = msg->front.iov_base; 579 u64 tid = le64_to_cpu(msg->hdr.tid); 580 581 if (msg->front.iov_len < sizeof(*reply)) 582 goto bad; 583 dout("handle_poolop_reply %p tid %llu\n", msg, tid); 584 585 mutex_lock(&monc->mutex); 586 req = __lookup_generic_req(monc, tid); 587 if (req) { 588 if (req->buf_len && 589 get_poolop_reply_buf(msg->front.iov_base + sizeof(*reply), 590 msg->front.iov_len - sizeof(*reply), 591 req->buf, req->buf_len) < 0) { 592 mutex_unlock(&monc->mutex); 593 goto bad; 594 } 595 req->result = le32_to_cpu(reply->reply_code); 596 get_generic_request(req); 597 } 598 mutex_unlock(&monc->mutex); 599 if (req) { 600 complete(&req->completion); 601 put_generic_request(req); 602 } 603 return; 604 605bad: 606 pr_err("corrupt generic reply, tid %llu\n", tid); 607 ceph_msg_dump(msg); 608} 609 610/* 611 * Do a synchronous pool op. 612 */ 613int ceph_monc_do_poolop(struct ceph_mon_client *monc, u32 op, 614 u32 pool, u64 snapid, 615 char *buf, int len) 616{ 617 struct ceph_mon_generic_request *req; 618 struct ceph_mon_poolop *h; 619 int err; 620 621 req = kzalloc(sizeof(*req), GFP_NOFS); 622 if (!req) 623 return -ENOMEM; 624 625 kref_init(&req->kref); 626 req->buf = buf; 627 req->buf_len = len; 628 init_completion(&req->completion); 629 630 err = -ENOMEM; 631 req->request = ceph_msg_new(CEPH_MSG_POOLOP, sizeof(*h), GFP_NOFS, 632 true); 633 if (!req->request) 634 goto out; 635 req->reply = ceph_msg_new(CEPH_MSG_POOLOP_REPLY, 1024, GFP_NOFS, 636 true); 637 if (!req->reply) 638 goto out; 639 640 /* fill out request */ 641 req->request->hdr.version = cpu_to_le16(2); 642 h = req->request->front.iov_base; 643 h->monhdr.have_version = 0; 644 h->monhdr.session_mon = cpu_to_le16(-1); 645 h->monhdr.session_mon_tid = 0; 646 h->fsid = monc->monmap->fsid; 647 h->pool = cpu_to_le32(pool); 648 h->op = cpu_to_le32(op); 649 h->auid = 0; 650 h->snapid = cpu_to_le64(snapid); 651 h->name_len = 0; 652 653 err = do_generic_request(monc, req); 654 655out: 656 kref_put(&req->kref, release_generic_request); 657 return err; 658} 659 660int ceph_monc_create_snapid(struct ceph_mon_client *monc, 661 u32 pool, u64 *snapid) 662{ 663 return ceph_monc_do_poolop(monc, POOL_OP_CREATE_UNMANAGED_SNAP, 664 pool, 0, (char *)snapid, sizeof(*snapid)); 665 666} 667EXPORT_SYMBOL(ceph_monc_create_snapid); 668 669int ceph_monc_delete_snapid(struct ceph_mon_client *monc, 670 u32 pool, u64 snapid) 671{ 672 return ceph_monc_do_poolop(monc, POOL_OP_CREATE_UNMANAGED_SNAP, 673 pool, snapid, 0, 0); 674 675} 676 677/* 678 * Resend pending generic requests. 679 */ 680static void __resend_generic_request(struct ceph_mon_client *monc) 681{ 682 struct ceph_mon_generic_request *req; 683 struct rb_node *p; 684 685 for (p = rb_first(&monc->generic_request_tree); p; p = rb_next(p)) { 686 req = rb_entry(p, struct ceph_mon_generic_request, node); 687 ceph_con_revoke(&monc->con, req->request); 688 ceph_con_send(&monc->con, ceph_msg_get(req->request)); 689 } 690} 691 692/* 693 * Delayed work. If we haven't mounted yet, retry. Otherwise, 694 * renew/retry subscription as needed (in case it is timing out, or we 695 * got an ENOMEM). And keep the monitor connection alive. 696 */ 697static void delayed_work(struct work_struct *work) 698{ 699 struct ceph_mon_client *monc = 700 container_of(work, struct ceph_mon_client, delayed_work.work); 701 702 dout("monc delayed_work\n"); 703 mutex_lock(&monc->mutex); 704 if (monc->hunting) { 705 __close_session(monc); 706 __open_session(monc); /* continue hunting */ 707 } else { 708 ceph_con_keepalive(&monc->con); 709 710 __validate_auth(monc); 711 712 if (monc->auth->ops->is_authenticated(monc->auth)) 713 __send_subscribe(monc); 714 } 715 __schedule_delayed(monc); 716 mutex_unlock(&monc->mutex); 717} 718 719/* 720 * On startup, we build a temporary monmap populated with the IPs 721 * provided by mount(2). 722 */ 723static int build_initial_monmap(struct ceph_mon_client *monc) 724{ 725 struct ceph_options *opt = monc->client->options; 726 struct ceph_entity_addr *mon_addr = opt->mon_addr; 727 int num_mon = opt->num_mon; 728 int i; 729 730 /* build initial monmap */ 731 monc->monmap = kzalloc(sizeof(*monc->monmap) + 732 num_mon*sizeof(monc->monmap->mon_inst[0]), 733 GFP_KERNEL); 734 if (!monc->monmap) 735 return -ENOMEM; 736 for (i = 0; i < num_mon; i++) { 737 monc->monmap->mon_inst[i].addr = mon_addr[i]; 738 monc->monmap->mon_inst[i].addr.nonce = 0; 739 monc->monmap->mon_inst[i].name.type = 740 CEPH_ENTITY_TYPE_MON; 741 monc->monmap->mon_inst[i].name.num = cpu_to_le64(i); 742 } 743 monc->monmap->num_mon = num_mon; 744 monc->have_fsid = false; 745 return 0; 746} 747 748int ceph_monc_init(struct ceph_mon_client *monc, struct ceph_client *cl) 749{ 750 int err = 0; 751 752 dout("init\n"); 753 memset(monc, 0, sizeof(*monc)); 754 monc->client = cl; 755 monc->monmap = NULL; 756 mutex_init(&monc->mutex); 757 758 err = build_initial_monmap(monc); 759 if (err) 760 goto out; 761 762 /* connection */ 763 ceph_con_init(&monc->client->msgr, &monc->con); 764 monc->con.private = monc; 765 monc->con.ops = &mon_con_ops; 766 767 /* authentication */ 768 monc->auth = ceph_auth_init(cl->options->name, 769 cl->options->key); 770 if (IS_ERR(monc->auth)) { 771 err = PTR_ERR(monc->auth); 772 goto out_monmap; 773 } 774 monc->auth->want_keys = 775 CEPH_ENTITY_TYPE_AUTH | CEPH_ENTITY_TYPE_MON | 776 CEPH_ENTITY_TYPE_OSD | CEPH_ENTITY_TYPE_MDS; 777 778 /* msgs */ 779 err = -ENOMEM; 780 monc->m_subscribe_ack = ceph_msg_new(CEPH_MSG_MON_SUBSCRIBE_ACK, 781 sizeof(struct ceph_mon_subscribe_ack), 782 GFP_NOFS, true); 783 if (!monc->m_subscribe_ack) 784 goto out_auth; 785 786 monc->m_subscribe = ceph_msg_new(CEPH_MSG_MON_SUBSCRIBE, 96, GFP_NOFS, 787 true); 788 if (!monc->m_subscribe) 789 goto out_subscribe_ack; 790 791 monc->m_auth_reply = ceph_msg_new(CEPH_MSG_AUTH_REPLY, 4096, GFP_NOFS, 792 true); 793 if (!monc->m_auth_reply) 794 goto out_subscribe; 795 796 monc->m_auth = ceph_msg_new(CEPH_MSG_AUTH, 4096, GFP_NOFS, true); 797 monc->pending_auth = 0; 798 if (!monc->m_auth) 799 goto out_auth_reply; 800 801 monc->cur_mon = -1; 802 monc->hunting = true; 803 monc->sub_renew_after = jiffies; 804 monc->sub_sent = 0; 805 806 INIT_DELAYED_WORK(&monc->delayed_work, delayed_work); 807 monc->generic_request_tree = RB_ROOT; 808 monc->num_generic_requests = 0; 809 monc->last_tid = 0; 810 811 monc->have_mdsmap = 0; 812 monc->have_osdmap = 0; 813 monc->want_next_osdmap = 1; 814 return 0; 815 816out_auth_reply: 817 ceph_msg_put(monc->m_auth_reply); 818out_subscribe: 819 ceph_msg_put(monc->m_subscribe); 820out_subscribe_ack: 821 ceph_msg_put(monc->m_subscribe_ack); 822out_auth: 823 ceph_auth_destroy(monc->auth); 824out_monmap: 825 kfree(monc->monmap); 826out: 827 return err; 828} 829EXPORT_SYMBOL(ceph_monc_init); 830 831void ceph_monc_stop(struct ceph_mon_client *monc) 832{ 833 dout("stop\n"); 834 cancel_delayed_work_sync(&monc->delayed_work); 835 836 mutex_lock(&monc->mutex); 837 __close_session(monc); 838 839 monc->con.private = NULL; 840 841 mutex_unlock(&monc->mutex); 842 843 ceph_auth_destroy(monc->auth); 844 845 ceph_msg_put(monc->m_auth); 846 ceph_msg_put(monc->m_auth_reply); 847 ceph_msg_put(monc->m_subscribe); 848 ceph_msg_put(monc->m_subscribe_ack); 849 850 kfree(monc->monmap); 851} 852EXPORT_SYMBOL(ceph_monc_stop); 853 854static void handle_auth_reply(struct ceph_mon_client *monc, 855 struct ceph_msg *msg) 856{ 857 int ret; 858 int was_auth = 0; 859 860 mutex_lock(&monc->mutex); 861 if (monc->auth->ops) 862 was_auth = monc->auth->ops->is_authenticated(monc->auth); 863 monc->pending_auth = 0; 864 ret = ceph_handle_auth_reply(monc->auth, msg->front.iov_base, 865 msg->front.iov_len, 866 monc->m_auth->front.iov_base, 867 monc->m_auth->front_max); 868 if (ret < 0) { 869 monc->client->auth_err = ret; 870 wake_up_all(&monc->client->auth_wq); 871 } else if (ret > 0) { 872 __send_prepared_auth_request(monc, ret); 873 } else if (!was_auth && monc->auth->ops->is_authenticated(monc->auth)) { 874 dout("authenticated, starting session\n"); 875 876 monc->client->msgr.inst.name.type = CEPH_ENTITY_TYPE_CLIENT; 877 monc->client->msgr.inst.name.num = 878 cpu_to_le64(monc->auth->global_id); 879 880 __send_subscribe(monc); 881 __resend_generic_request(monc); 882 } 883 mutex_unlock(&monc->mutex); 884} 885 886static int __validate_auth(struct ceph_mon_client *monc) 887{ 888 int ret; 889 890 if (monc->pending_auth) 891 return 0; 892 893 ret = ceph_build_auth(monc->auth, monc->m_auth->front.iov_base, 894 monc->m_auth->front_max); 895 if (ret <= 0) 896 return ret; /* either an error, or no need to authenticate */ 897 __send_prepared_auth_request(monc, ret); 898 return 0; 899} 900 901int ceph_monc_validate_auth(struct ceph_mon_client *monc) 902{ 903 int ret; 904 905 mutex_lock(&monc->mutex); 906 ret = __validate_auth(monc); 907 mutex_unlock(&monc->mutex); 908 return ret; 909} 910EXPORT_SYMBOL(ceph_monc_validate_auth); 911 912/* 913 * handle incoming message 914 */ 915static void dispatch(struct ceph_connection *con, struct ceph_msg *msg) 916{ 917 struct ceph_mon_client *monc = con->private; 918 int type = le16_to_cpu(msg->hdr.type); 919 920 if (!monc) 921 return; 922 923 switch (type) { 924 case CEPH_MSG_AUTH_REPLY: 925 handle_auth_reply(monc, msg); 926 break; 927 928 case CEPH_MSG_MON_SUBSCRIBE_ACK: 929 handle_subscribe_ack(monc, msg); 930 break; 931 932 case CEPH_MSG_STATFS_REPLY: 933 handle_statfs_reply(monc, msg); 934 break; 935 936 case CEPH_MSG_POOLOP_REPLY: 937 handle_poolop_reply(monc, msg); 938 break; 939 940 case CEPH_MSG_MON_MAP: 941 ceph_monc_handle_map(monc, msg); 942 break; 943 944 case CEPH_MSG_OSD_MAP: 945 ceph_osdc_handle_map(&monc->client->osdc, msg); 946 break; 947 948 default: 949 /* can the chained handler handle it? */ 950 if (monc->client->extra_mon_dispatch && 951 monc->client->extra_mon_dispatch(monc->client, msg) == 0) 952 break; 953 954 pr_err("received unknown message type %d %s\n", type, 955 ceph_msg_type_name(type)); 956 } 957 ceph_msg_put(msg); 958} 959 960/* 961 * Allocate memory for incoming message 962 */ 963static struct ceph_msg *mon_alloc_msg(struct ceph_connection *con, 964 struct ceph_msg_header *hdr, 965 int *skip) 966{ 967 struct ceph_mon_client *monc = con->private; 968 int type = le16_to_cpu(hdr->type); 969 int front_len = le32_to_cpu(hdr->front_len); 970 struct ceph_msg *m = NULL; 971 972 *skip = 0; 973 974 switch (type) { 975 case CEPH_MSG_MON_SUBSCRIBE_ACK: 976 m = ceph_msg_get(monc->m_subscribe_ack); 977 break; 978 case CEPH_MSG_POOLOP_REPLY: 979 case CEPH_MSG_STATFS_REPLY: 980 return get_generic_reply(con, hdr, skip); 981 case CEPH_MSG_AUTH_REPLY: 982 m = ceph_msg_get(monc->m_auth_reply); 983 break; 984 case CEPH_MSG_MON_MAP: 985 case CEPH_MSG_MDS_MAP: 986 case CEPH_MSG_OSD_MAP: 987 m = ceph_msg_new(type, front_len, GFP_NOFS, false); 988 break; 989 } 990 991 if (!m) { 992 pr_info("alloc_msg unknown type %d\n", type); 993 *skip = 1; 994 } 995 return m; 996} 997 998/* 999 * If the monitor connection resets, pick a new monitor and resubmit 1000 * any pending requests. 1001 */ 1002static void mon_fault(struct ceph_connection *con) 1003{ 1004 struct ceph_mon_client *monc = con->private; 1005 1006 if (!monc) 1007 return; 1008 1009 dout("mon_fault\n"); 1010 mutex_lock(&monc->mutex); 1011 if (!con->private) 1012 goto out; 1013 1014 if (!monc->hunting) 1015 pr_info("mon%d %s session lost, " 1016 "hunting for new mon\n", monc->cur_mon, 1017 ceph_pr_addr(&monc->con.peer_addr.in_addr)); 1018 1019 __close_session(monc); 1020 if (!monc->hunting) { 1021 /* start hunting */ 1022 monc->hunting = true; 1023 __open_session(monc); 1024 } else { 1025 /* already hunting, let's wait a bit */ 1026 __schedule_delayed(monc); 1027 } 1028out: 1029 mutex_unlock(&monc->mutex); 1030} 1031 1032/* 1033 * We can ignore refcounting on the connection struct, as all references 1034 * will come from the messenger workqueue, which is drained prior to 1035 * mon_client destruction. 1036 */ 1037static struct ceph_connection *con_get(struct ceph_connection *con) 1038{ 1039 return con; 1040} 1041 1042static void con_put(struct ceph_connection *con) 1043{ 1044} 1045 1046static const struct ceph_connection_operations mon_con_ops = { 1047 .get = con_get, 1048 .put = con_put, 1049 .dispatch = dispatch, 1050 .fault = mon_fault, 1051 .alloc_msg = mon_alloc_msg, 1052}; 1053