mon_client.c revision 49d9224c047f23089c49a6749609447abd09ee03
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/decode.h> 12 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 343out: 344 mutex_unlock(&monc->mutex); 345 wake_up_all(&client->auth_wq); 346} 347 348/* 349 * generic requests (e.g., statfs, poolop) 350 */ 351static struct ceph_mon_generic_request *__lookup_generic_req( 352 struct ceph_mon_client *monc, u64 tid) 353{ 354 struct ceph_mon_generic_request *req; 355 struct rb_node *n = monc->generic_request_tree.rb_node; 356 357 while (n) { 358 req = rb_entry(n, struct ceph_mon_generic_request, node); 359 if (tid < req->tid) 360 n = n->rb_left; 361 else if (tid > req->tid) 362 n = n->rb_right; 363 else 364 return req; 365 } 366 return NULL; 367} 368 369static void __insert_generic_request(struct ceph_mon_client *monc, 370 struct ceph_mon_generic_request *new) 371{ 372 struct rb_node **p = &monc->generic_request_tree.rb_node; 373 struct rb_node *parent = NULL; 374 struct ceph_mon_generic_request *req = NULL; 375 376 while (*p) { 377 parent = *p; 378 req = rb_entry(parent, struct ceph_mon_generic_request, node); 379 if (new->tid < req->tid) 380 p = &(*p)->rb_left; 381 else if (new->tid > req->tid) 382 p = &(*p)->rb_right; 383 else 384 BUG(); 385 } 386 387 rb_link_node(&new->node, parent, p); 388 rb_insert_color(&new->node, &monc->generic_request_tree); 389} 390 391static void release_generic_request(struct kref *kref) 392{ 393 struct ceph_mon_generic_request *req = 394 container_of(kref, struct ceph_mon_generic_request, kref); 395 396 if (req->reply) 397 ceph_msg_put(req->reply); 398 if (req->request) 399 ceph_msg_put(req->request); 400 401 kfree(req); 402} 403 404static void put_generic_request(struct ceph_mon_generic_request *req) 405{ 406 kref_put(&req->kref, release_generic_request); 407} 408 409static void get_generic_request(struct ceph_mon_generic_request *req) 410{ 411 kref_get(&req->kref); 412} 413 414static struct ceph_msg *get_generic_reply(struct ceph_connection *con, 415 struct ceph_msg_header *hdr, 416 int *skip) 417{ 418 struct ceph_mon_client *monc = con->private; 419 struct ceph_mon_generic_request *req; 420 u64 tid = le64_to_cpu(hdr->tid); 421 struct ceph_msg *m; 422 423 mutex_lock(&monc->mutex); 424 req = __lookup_generic_req(monc, tid); 425 if (!req) { 426 dout("get_generic_reply %lld dne\n", tid); 427 *skip = 1; 428 m = NULL; 429 } else { 430 dout("get_generic_reply %lld got %p\n", tid, req->reply); 431 m = ceph_msg_get(req->reply); 432 /* 433 * we don't need to track the connection reading into 434 * this reply because we only have one open connection 435 * at a time, ever. 436 */ 437 } 438 mutex_unlock(&monc->mutex); 439 return m; 440} 441 442static int do_generic_request(struct ceph_mon_client *monc, 443 struct ceph_mon_generic_request *req) 444{ 445 int err; 446 447 /* register request */ 448 mutex_lock(&monc->mutex); 449 req->tid = ++monc->last_tid; 450 req->request->hdr.tid = cpu_to_le64(req->tid); 451 __insert_generic_request(monc, req); 452 monc->num_generic_requests++; 453 ceph_con_send(monc->con, ceph_msg_get(req->request)); 454 mutex_unlock(&monc->mutex); 455 456 err = wait_for_completion_interruptible(&req->completion); 457 458 mutex_lock(&monc->mutex); 459 rb_erase(&req->node, &monc->generic_request_tree); 460 monc->num_generic_requests--; 461 mutex_unlock(&monc->mutex); 462 463 if (!err) 464 err = req->result; 465 return err; 466} 467 468/* 469 * statfs 470 */ 471static void handle_statfs_reply(struct ceph_mon_client *monc, 472 struct ceph_msg *msg) 473{ 474 struct ceph_mon_generic_request *req; 475 struct ceph_mon_statfs_reply *reply = msg->front.iov_base; 476 u64 tid = le64_to_cpu(msg->hdr.tid); 477 478 if (msg->front.iov_len != sizeof(*reply)) 479 goto bad; 480 dout("handle_statfs_reply %p tid %llu\n", msg, tid); 481 482 mutex_lock(&monc->mutex); 483 req = __lookup_generic_req(monc, tid); 484 if (req) { 485 *(struct ceph_statfs *)req->buf = reply->st; 486 req->result = 0; 487 get_generic_request(req); 488 } 489 mutex_unlock(&monc->mutex); 490 if (req) { 491 complete_all(&req->completion); 492 put_generic_request(req); 493 } 494 return; 495 496bad: 497 pr_err("corrupt generic reply, tid %llu\n", tid); 498 ceph_msg_dump(msg); 499} 500 501/* 502 * Do a synchronous statfs(). 503 */ 504int ceph_monc_do_statfs(struct ceph_mon_client *monc, struct ceph_statfs *buf) 505{ 506 struct ceph_mon_generic_request *req; 507 struct ceph_mon_statfs *h; 508 int err; 509 510 req = kzalloc(sizeof(*req), GFP_NOFS); 511 if (!req) 512 return -ENOMEM; 513 514 kref_init(&req->kref); 515 req->buf = buf; 516 req->buf_len = sizeof(*buf); 517 init_completion(&req->completion); 518 519 err = -ENOMEM; 520 req->request = ceph_msg_new(CEPH_MSG_STATFS, sizeof(*h), GFP_NOFS, 521 true); 522 if (!req->request) 523 goto out; 524 req->reply = ceph_msg_new(CEPH_MSG_STATFS_REPLY, 1024, GFP_NOFS, 525 true); 526 if (!req->reply) 527 goto out; 528 529 /* fill out request */ 530 h = req->request->front.iov_base; 531 h->monhdr.have_version = 0; 532 h->monhdr.session_mon = cpu_to_le16(-1); 533 h->monhdr.session_mon_tid = 0; 534 h->fsid = monc->monmap->fsid; 535 536 err = do_generic_request(monc, req); 537 538out: 539 kref_put(&req->kref, release_generic_request); 540 return err; 541} 542EXPORT_SYMBOL(ceph_monc_do_statfs); 543 544/* 545 * pool ops 546 */ 547static int get_poolop_reply_buf(const char *src, size_t src_len, 548 char *dst, size_t dst_len) 549{ 550 u32 buf_len; 551 552 if (src_len != sizeof(u32) + dst_len) 553 return -EINVAL; 554 555 buf_len = le32_to_cpu(*(u32 *)src); 556 if (buf_len != dst_len) 557 return -EINVAL; 558 559 memcpy(dst, src + sizeof(u32), dst_len); 560 return 0; 561} 562 563static void handle_poolop_reply(struct ceph_mon_client *monc, 564 struct ceph_msg *msg) 565{ 566 struct ceph_mon_generic_request *req; 567 struct ceph_mon_poolop_reply *reply = msg->front.iov_base; 568 u64 tid = le64_to_cpu(msg->hdr.tid); 569 570 if (msg->front.iov_len < sizeof(*reply)) 571 goto bad; 572 dout("handle_poolop_reply %p tid %llu\n", msg, tid); 573 574 mutex_lock(&monc->mutex); 575 req = __lookup_generic_req(monc, tid); 576 if (req) { 577 if (req->buf_len && 578 get_poolop_reply_buf(msg->front.iov_base + sizeof(*reply), 579 msg->front.iov_len - sizeof(*reply), 580 req->buf, req->buf_len) < 0) { 581 mutex_unlock(&monc->mutex); 582 goto bad; 583 } 584 req->result = le32_to_cpu(reply->reply_code); 585 get_generic_request(req); 586 } 587 mutex_unlock(&monc->mutex); 588 if (req) { 589 complete(&req->completion); 590 put_generic_request(req); 591 } 592 return; 593 594bad: 595 pr_err("corrupt generic reply, tid %llu\n", tid); 596 ceph_msg_dump(msg); 597} 598 599/* 600 * Do a synchronous pool op. 601 */ 602int ceph_monc_do_poolop(struct ceph_mon_client *monc, u32 op, 603 u32 pool, u64 snapid, 604 char *buf, int len) 605{ 606 struct ceph_mon_generic_request *req; 607 struct ceph_mon_poolop *h; 608 int err; 609 610 req = kzalloc(sizeof(*req), GFP_NOFS); 611 if (!req) 612 return -ENOMEM; 613 614 kref_init(&req->kref); 615 req->buf = buf; 616 req->buf_len = len; 617 init_completion(&req->completion); 618 619 err = -ENOMEM; 620 req->request = ceph_msg_new(CEPH_MSG_POOLOP, sizeof(*h), GFP_NOFS, 621 true); 622 if (!req->request) 623 goto out; 624 req->reply = ceph_msg_new(CEPH_MSG_POOLOP_REPLY, 1024, GFP_NOFS, 625 true); 626 if (!req->reply) 627 goto out; 628 629 /* fill out request */ 630 req->request->hdr.version = cpu_to_le16(2); 631 h = req->request->front.iov_base; 632 h->monhdr.have_version = 0; 633 h->monhdr.session_mon = cpu_to_le16(-1); 634 h->monhdr.session_mon_tid = 0; 635 h->fsid = monc->monmap->fsid; 636 h->pool = cpu_to_le32(pool); 637 h->op = cpu_to_le32(op); 638 h->auid = 0; 639 h->snapid = cpu_to_le64(snapid); 640 h->name_len = 0; 641 642 err = do_generic_request(monc, req); 643 644out: 645 kref_put(&req->kref, release_generic_request); 646 return err; 647} 648 649int ceph_monc_create_snapid(struct ceph_mon_client *monc, 650 u32 pool, u64 *snapid) 651{ 652 return ceph_monc_do_poolop(monc, POOL_OP_CREATE_UNMANAGED_SNAP, 653 pool, 0, (char *)snapid, sizeof(*snapid)); 654 655} 656EXPORT_SYMBOL(ceph_monc_create_snapid); 657 658int ceph_monc_delete_snapid(struct ceph_mon_client *monc, 659 u32 pool, u64 snapid) 660{ 661 return ceph_monc_do_poolop(monc, POOL_OP_CREATE_UNMANAGED_SNAP, 662 pool, snapid, 0, 0); 663 664} 665 666/* 667 * Resend pending generic requests. 668 */ 669static void __resend_generic_request(struct ceph_mon_client *monc) 670{ 671 struct ceph_mon_generic_request *req; 672 struct rb_node *p; 673 674 for (p = rb_first(&monc->generic_request_tree); p; p = rb_next(p)) { 675 req = rb_entry(p, struct ceph_mon_generic_request, node); 676 ceph_con_revoke(monc->con, req->request); 677 ceph_con_send(monc->con, ceph_msg_get(req->request)); 678 } 679} 680 681/* 682 * Delayed work. If we haven't mounted yet, retry. Otherwise, 683 * renew/retry subscription as needed (in case it is timing out, or we 684 * got an ENOMEM). And keep the monitor connection alive. 685 */ 686static void delayed_work(struct work_struct *work) 687{ 688 struct ceph_mon_client *monc = 689 container_of(work, struct ceph_mon_client, delayed_work.work); 690 691 dout("monc delayed_work\n"); 692 mutex_lock(&monc->mutex); 693 if (monc->hunting) { 694 __close_session(monc); 695 __open_session(monc); /* continue hunting */ 696 } else { 697 ceph_con_keepalive(monc->con); 698 699 __validate_auth(monc); 700 701 if (monc->auth->ops->is_authenticated(monc->auth)) 702 __send_subscribe(monc); 703 } 704 __schedule_delayed(monc); 705 mutex_unlock(&monc->mutex); 706} 707 708/* 709 * On startup, we build a temporary monmap populated with the IPs 710 * provided by mount(2). 711 */ 712static int build_initial_monmap(struct ceph_mon_client *monc) 713{ 714 struct ceph_options *opt = monc->client->options; 715 struct ceph_entity_addr *mon_addr = opt->mon_addr; 716 int num_mon = opt->num_mon; 717 int i; 718 719 /* build initial monmap */ 720 monc->monmap = kzalloc(sizeof(*monc->monmap) + 721 num_mon*sizeof(monc->monmap->mon_inst[0]), 722 GFP_KERNEL); 723 if (!monc->monmap) 724 return -ENOMEM; 725 for (i = 0; i < num_mon; i++) { 726 monc->monmap->mon_inst[i].addr = mon_addr[i]; 727 monc->monmap->mon_inst[i].addr.nonce = 0; 728 monc->monmap->mon_inst[i].name.type = 729 CEPH_ENTITY_TYPE_MON; 730 monc->monmap->mon_inst[i].name.num = cpu_to_le64(i); 731 } 732 monc->monmap->num_mon = num_mon; 733 monc->have_fsid = false; 734 return 0; 735} 736 737int ceph_monc_init(struct ceph_mon_client *monc, struct ceph_client *cl) 738{ 739 int err = 0; 740 741 dout("init\n"); 742 memset(monc, 0, sizeof(*monc)); 743 monc->client = cl; 744 monc->monmap = NULL; 745 mutex_init(&monc->mutex); 746 747 err = build_initial_monmap(monc); 748 if (err) 749 goto out; 750 751 /* connection */ 752 monc->con = kmalloc(sizeof(*monc->con), GFP_KERNEL); 753 if (!monc->con) 754 goto out_monmap; 755 ceph_con_init(monc->client->msgr, monc->con); 756 monc->con->private = monc; 757 monc->con->ops = &mon_con_ops; 758 759 /* authentication */ 760 monc->auth = ceph_auth_init(cl->options->name, 761 cl->options->key); 762 if (IS_ERR(monc->auth)) { 763 err = PTR_ERR(monc->auth); 764 goto out_con; 765 } 766 monc->auth->want_keys = 767 CEPH_ENTITY_TYPE_AUTH | CEPH_ENTITY_TYPE_MON | 768 CEPH_ENTITY_TYPE_OSD | CEPH_ENTITY_TYPE_MDS; 769 770 /* msgs */ 771 err = -ENOMEM; 772 monc->m_subscribe_ack = ceph_msg_new(CEPH_MSG_MON_SUBSCRIBE_ACK, 773 sizeof(struct ceph_mon_subscribe_ack), 774 GFP_NOFS, true); 775 if (!monc->m_subscribe_ack) 776 goto out_auth; 777 778 monc->m_subscribe = ceph_msg_new(CEPH_MSG_MON_SUBSCRIBE, 96, GFP_NOFS, 779 true); 780 if (!monc->m_subscribe) 781 goto out_subscribe_ack; 782 783 monc->m_auth_reply = ceph_msg_new(CEPH_MSG_AUTH_REPLY, 4096, GFP_NOFS, 784 true); 785 if (!monc->m_auth_reply) 786 goto out_subscribe; 787 788 monc->m_auth = ceph_msg_new(CEPH_MSG_AUTH, 4096, GFP_NOFS, true); 789 monc->pending_auth = 0; 790 if (!monc->m_auth) 791 goto out_auth_reply; 792 793 monc->cur_mon = -1; 794 monc->hunting = true; 795 monc->sub_renew_after = jiffies; 796 monc->sub_sent = 0; 797 798 INIT_DELAYED_WORK(&monc->delayed_work, delayed_work); 799 monc->generic_request_tree = RB_ROOT; 800 monc->num_generic_requests = 0; 801 monc->last_tid = 0; 802 803 monc->have_mdsmap = 0; 804 monc->have_osdmap = 0; 805 monc->want_next_osdmap = 1; 806 return 0; 807 808out_auth_reply: 809 ceph_msg_put(monc->m_auth_reply); 810out_subscribe: 811 ceph_msg_put(monc->m_subscribe); 812out_subscribe_ack: 813 ceph_msg_put(monc->m_subscribe_ack); 814out_auth: 815 ceph_auth_destroy(monc->auth); 816out_con: 817 monc->con->ops->put(monc->con); 818out_monmap: 819 kfree(monc->monmap); 820out: 821 return err; 822} 823EXPORT_SYMBOL(ceph_monc_init); 824 825void ceph_monc_stop(struct ceph_mon_client *monc) 826{ 827 dout("stop\n"); 828 cancel_delayed_work_sync(&monc->delayed_work); 829 830 mutex_lock(&monc->mutex); 831 __close_session(monc); 832 833 monc->con->private = NULL; 834 monc->con->ops->put(monc->con); 835 monc->con = NULL; 836 837 mutex_unlock(&monc->mutex); 838 839 ceph_auth_destroy(monc->auth); 840 841 ceph_msg_put(monc->m_auth); 842 ceph_msg_put(monc->m_auth_reply); 843 ceph_msg_put(monc->m_subscribe); 844 ceph_msg_put(monc->m_subscribe_ack); 845 846 kfree(monc->monmap); 847} 848EXPORT_SYMBOL(ceph_monc_stop); 849 850static void handle_auth_reply(struct ceph_mon_client *monc, 851 struct ceph_msg *msg) 852{ 853 int ret; 854 int was_auth = 0; 855 856 mutex_lock(&monc->mutex); 857 if (monc->auth->ops) 858 was_auth = monc->auth->ops->is_authenticated(monc->auth); 859 monc->pending_auth = 0; 860 ret = ceph_handle_auth_reply(monc->auth, msg->front.iov_base, 861 msg->front.iov_len, 862 monc->m_auth->front.iov_base, 863 monc->m_auth->front_max); 864 if (ret < 0) { 865 monc->client->auth_err = ret; 866 wake_up_all(&monc->client->auth_wq); 867 } else if (ret > 0) { 868 __send_prepared_auth_request(monc, ret); 869 } else if (!was_auth && monc->auth->ops->is_authenticated(monc->auth)) { 870 dout("authenticated, starting session\n"); 871 872 monc->client->msgr->inst.name.type = CEPH_ENTITY_TYPE_CLIENT; 873 monc->client->msgr->inst.name.num = 874 cpu_to_le64(monc->auth->global_id); 875 876 __send_subscribe(monc); 877 __resend_generic_request(monc); 878 } 879 mutex_unlock(&monc->mutex); 880} 881 882static int __validate_auth(struct ceph_mon_client *monc) 883{ 884 int ret; 885 886 if (monc->pending_auth) 887 return 0; 888 889 ret = ceph_build_auth(monc->auth, monc->m_auth->front.iov_base, 890 monc->m_auth->front_max); 891 if (ret <= 0) 892 return ret; /* either an error, or no need to authenticate */ 893 __send_prepared_auth_request(monc, ret); 894 return 0; 895} 896 897int ceph_monc_validate_auth(struct ceph_mon_client *monc) 898{ 899 int ret; 900 901 mutex_lock(&monc->mutex); 902 ret = __validate_auth(monc); 903 mutex_unlock(&monc->mutex); 904 return ret; 905} 906EXPORT_SYMBOL(ceph_monc_validate_auth); 907 908/* 909 * handle incoming message 910 */ 911static void dispatch(struct ceph_connection *con, struct ceph_msg *msg) 912{ 913 struct ceph_mon_client *monc = con->private; 914 int type = le16_to_cpu(msg->hdr.type); 915 916 if (!monc) 917 return; 918 919 switch (type) { 920 case CEPH_MSG_AUTH_REPLY: 921 handle_auth_reply(monc, msg); 922 break; 923 924 case CEPH_MSG_MON_SUBSCRIBE_ACK: 925 handle_subscribe_ack(monc, msg); 926 break; 927 928 case CEPH_MSG_STATFS_REPLY: 929 handle_statfs_reply(monc, msg); 930 break; 931 932 case CEPH_MSG_POOLOP_REPLY: 933 handle_poolop_reply(monc, msg); 934 break; 935 936 case CEPH_MSG_MON_MAP: 937 ceph_monc_handle_map(monc, msg); 938 break; 939 940 case CEPH_MSG_OSD_MAP: 941 ceph_osdc_handle_map(&monc->client->osdc, msg); 942 break; 943 944 default: 945 /* can the chained handler handle it? */ 946 if (monc->client->extra_mon_dispatch && 947 monc->client->extra_mon_dispatch(monc->client, msg) == 0) 948 break; 949 950 pr_err("received unknown message type %d %s\n", type, 951 ceph_msg_type_name(type)); 952 } 953 ceph_msg_put(msg); 954} 955 956/* 957 * Allocate memory for incoming message 958 */ 959static struct ceph_msg *mon_alloc_msg(struct ceph_connection *con, 960 struct ceph_msg_header *hdr, 961 int *skip) 962{ 963 struct ceph_mon_client *monc = con->private; 964 int type = le16_to_cpu(hdr->type); 965 int front_len = le32_to_cpu(hdr->front_len); 966 struct ceph_msg *m = NULL; 967 968 *skip = 0; 969 970 switch (type) { 971 case CEPH_MSG_MON_SUBSCRIBE_ACK: 972 m = ceph_msg_get(monc->m_subscribe_ack); 973 break; 974 case CEPH_MSG_POOLOP_REPLY: 975 case CEPH_MSG_STATFS_REPLY: 976 return get_generic_reply(con, hdr, skip); 977 case CEPH_MSG_AUTH_REPLY: 978 m = ceph_msg_get(monc->m_auth_reply); 979 break; 980 case CEPH_MSG_MON_MAP: 981 case CEPH_MSG_MDS_MAP: 982 case CEPH_MSG_OSD_MAP: 983 m = ceph_msg_new(type, front_len, GFP_NOFS, false); 984 break; 985 } 986 987 if (!m) { 988 pr_info("alloc_msg unknown type %d\n", type); 989 *skip = 1; 990 } 991 return m; 992} 993 994/* 995 * If the monitor connection resets, pick a new monitor and resubmit 996 * any pending requests. 997 */ 998static void mon_fault(struct ceph_connection *con) 999{ 1000 struct ceph_mon_client *monc = con->private; 1001 1002 if (!monc) 1003 return; 1004 1005 dout("mon_fault\n"); 1006 mutex_lock(&monc->mutex); 1007 if (!con->private) 1008 goto out; 1009 1010 if (!monc->hunting) 1011 pr_info("mon%d %s session lost, " 1012 "hunting for new mon\n", monc->cur_mon, 1013 ceph_pr_addr(&monc->con->peer_addr.in_addr)); 1014 1015 __close_session(monc); 1016 if (!monc->hunting) { 1017 /* start hunting */ 1018 monc->hunting = true; 1019 __open_session(monc); 1020 } else { 1021 /* already hunting, let's wait a bit */ 1022 __schedule_delayed(monc); 1023 } 1024out: 1025 mutex_unlock(&monc->mutex); 1026} 1027 1028static const struct ceph_connection_operations mon_con_ops = { 1029 .get = ceph_con_get, 1030 .put = ceph_con_put, 1031 .dispatch = dispatch, 1032 .fault = mon_fault, 1033 .alloc_msg = mon_alloc_msg, 1034}; 1035