mon_client.c revision d1c338a509cea5378df59629ad47382810c38623
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_msg_revoke(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_msg_revoke(monc->m_auth); 121 ceph_msg_revoke_incoming(monc->m_auth_reply); 122 ceph_msg_revoke(monc->m_subscribe); 123 ceph_msg_revoke_incoming(monc->m_subscribe_ack); 124 ceph_con_close(&monc->con); 125 monc->cur_mon = -1; 126 monc->pending_auth = 0; 127 ceph_auth_reset(monc->auth); 128} 129 130/* 131 * Open a session with a (new) monitor. 132 */ 133static int __open_session(struct ceph_mon_client *monc) 134{ 135 char r; 136 int ret; 137 138 if (monc->cur_mon < 0) { 139 get_random_bytes(&r, 1); 140 monc->cur_mon = r % monc->monmap->num_mon; 141 dout("open_session num=%d r=%d -> mon%d\n", 142 monc->monmap->num_mon, r, monc->cur_mon); 143 monc->sub_sent = 0; 144 monc->sub_renew_after = jiffies; /* i.e., expired */ 145 monc->want_next_osdmap = !!monc->want_next_osdmap; 146 147 dout("open_session mon%d opening\n", monc->cur_mon); 148 ceph_con_open(&monc->con, 149 CEPH_ENTITY_TYPE_MON, monc->cur_mon, 150 &monc->monmap->mon_inst[monc->cur_mon].addr); 151 152 /* initiatiate authentication handshake */ 153 ret = ceph_auth_build_hello(monc->auth, 154 monc->m_auth->front.iov_base, 155 monc->m_auth->front_max); 156 __send_prepared_auth_request(monc, ret); 157 } else { 158 dout("open_session mon%d already open\n", monc->cur_mon); 159 } 160 return 0; 161} 162 163static bool __sub_expired(struct ceph_mon_client *monc) 164{ 165 return time_after_eq(jiffies, monc->sub_renew_after); 166} 167 168/* 169 * Reschedule delayed work timer. 170 */ 171static void __schedule_delayed(struct ceph_mon_client *monc) 172{ 173 unsigned int delay; 174 175 if (monc->cur_mon < 0 || __sub_expired(monc)) 176 delay = 10 * HZ; 177 else 178 delay = 20 * HZ; 179 dout("__schedule_delayed after %u\n", delay); 180 schedule_delayed_work(&monc->delayed_work, delay); 181} 182 183/* 184 * Send subscribe request for mdsmap and/or osdmap. 185 */ 186static void __send_subscribe(struct ceph_mon_client *monc) 187{ 188 dout("__send_subscribe sub_sent=%u exp=%u want_osd=%d\n", 189 (unsigned int)monc->sub_sent, __sub_expired(monc), 190 monc->want_next_osdmap); 191 if ((__sub_expired(monc) && !monc->sub_sent) || 192 monc->want_next_osdmap == 1) { 193 struct ceph_msg *msg = monc->m_subscribe; 194 struct ceph_mon_subscribe_item *i; 195 void *p, *end; 196 int num; 197 198 p = msg->front.iov_base; 199 end = p + msg->front_max; 200 201 num = 1 + !!monc->want_next_osdmap + !!monc->want_mdsmap; 202 ceph_encode_32(&p, num); 203 204 if (monc->want_next_osdmap) { 205 dout("__send_subscribe to 'osdmap' %u\n", 206 (unsigned int)monc->have_osdmap); 207 ceph_encode_string(&p, end, "osdmap", 6); 208 i = p; 209 i->have = cpu_to_le64(monc->have_osdmap); 210 i->onetime = 1; 211 p += sizeof(*i); 212 monc->want_next_osdmap = 2; /* requested */ 213 } 214 if (monc->want_mdsmap) { 215 dout("__send_subscribe to 'mdsmap' %u+\n", 216 (unsigned int)monc->have_mdsmap); 217 ceph_encode_string(&p, end, "mdsmap", 6); 218 i = p; 219 i->have = cpu_to_le64(monc->have_mdsmap); 220 i->onetime = 0; 221 p += sizeof(*i); 222 } 223 ceph_encode_string(&p, end, "monmap", 6); 224 i = p; 225 i->have = 0; 226 i->onetime = 0; 227 p += sizeof(*i); 228 229 msg->front.iov_len = p - msg->front.iov_base; 230 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len); 231 ceph_msg_revoke(msg); 232 ceph_con_send(&monc->con, ceph_msg_get(msg)); 233 234 monc->sub_sent = jiffies | 1; /* never 0 */ 235 } 236} 237 238static void handle_subscribe_ack(struct ceph_mon_client *monc, 239 struct ceph_msg *msg) 240{ 241 unsigned int seconds; 242 struct ceph_mon_subscribe_ack *h = msg->front.iov_base; 243 244 if (msg->front.iov_len < sizeof(*h)) 245 goto bad; 246 seconds = le32_to_cpu(h->duration); 247 248 mutex_lock(&monc->mutex); 249 if (monc->hunting) { 250 pr_info("mon%d %s session established\n", 251 monc->cur_mon, 252 ceph_pr_addr(&monc->con.peer_addr.in_addr)); 253 monc->hunting = false; 254 } 255 dout("handle_subscribe_ack after %d seconds\n", seconds); 256 monc->sub_renew_after = monc->sub_sent + (seconds >> 1)*HZ - 1; 257 monc->sub_sent = 0; 258 mutex_unlock(&monc->mutex); 259 return; 260bad: 261 pr_err("got corrupt subscribe-ack msg\n"); 262 ceph_msg_dump(msg); 263} 264 265/* 266 * Keep track of which maps we have 267 */ 268int ceph_monc_got_mdsmap(struct ceph_mon_client *monc, u32 got) 269{ 270 mutex_lock(&monc->mutex); 271 monc->have_mdsmap = got; 272 mutex_unlock(&monc->mutex); 273 return 0; 274} 275EXPORT_SYMBOL(ceph_monc_got_mdsmap); 276 277int ceph_monc_got_osdmap(struct ceph_mon_client *monc, u32 got) 278{ 279 mutex_lock(&monc->mutex); 280 monc->have_osdmap = got; 281 monc->want_next_osdmap = 0; 282 mutex_unlock(&monc->mutex); 283 return 0; 284} 285 286/* 287 * Register interest in the next osdmap 288 */ 289void ceph_monc_request_next_osdmap(struct ceph_mon_client *monc) 290{ 291 dout("request_next_osdmap have %u\n", monc->have_osdmap); 292 mutex_lock(&monc->mutex); 293 if (!monc->want_next_osdmap) 294 monc->want_next_osdmap = 1; 295 if (monc->want_next_osdmap < 2) 296 __send_subscribe(monc); 297 mutex_unlock(&monc->mutex); 298} 299 300/* 301 * 302 */ 303int ceph_monc_open_session(struct ceph_mon_client *monc) 304{ 305 mutex_lock(&monc->mutex); 306 __open_session(monc); 307 __schedule_delayed(monc); 308 mutex_unlock(&monc->mutex); 309 return 0; 310} 311EXPORT_SYMBOL(ceph_monc_open_session); 312 313/* 314 * We require the fsid and global_id in order to initialize our 315 * debugfs dir. 316 */ 317static bool have_debugfs_info(struct ceph_mon_client *monc) 318{ 319 dout("have_debugfs_info fsid %d globalid %lld\n", 320 (int)monc->client->have_fsid, monc->auth->global_id); 321 return monc->client->have_fsid && monc->auth->global_id > 0; 322} 323 324/* 325 * The monitor responds with mount ack indicate mount success. The 326 * included client ticket allows the client to talk to MDSs and OSDs. 327 */ 328static void ceph_monc_handle_map(struct ceph_mon_client *monc, 329 struct ceph_msg *msg) 330{ 331 struct ceph_client *client = monc->client; 332 struct ceph_monmap *monmap = NULL, *old = monc->monmap; 333 void *p, *end; 334 int had_debugfs_info, init_debugfs = 0; 335 336 mutex_lock(&monc->mutex); 337 338 had_debugfs_info = have_debugfs_info(monc); 339 340 dout("handle_monmap\n"); 341 p = msg->front.iov_base; 342 end = p + msg->front.iov_len; 343 344 monmap = ceph_monmap_decode(p, end); 345 if (IS_ERR(monmap)) { 346 pr_err("problem decoding monmap, %d\n", 347 (int)PTR_ERR(monmap)); 348 goto out; 349 } 350 351 if (ceph_check_fsid(monc->client, &monmap->fsid) < 0) { 352 kfree(monmap); 353 goto out; 354 } 355 356 client->monc.monmap = monmap; 357 kfree(old); 358 359 if (!client->have_fsid) { 360 client->have_fsid = true; 361 if (!had_debugfs_info && have_debugfs_info(monc)) { 362 pr_info("client%lld fsid %pU\n", 363 ceph_client_id(monc->client), 364 &monc->client->fsid); 365 init_debugfs = 1; 366 } 367 mutex_unlock(&monc->mutex); 368 369 if (init_debugfs) { 370 /* 371 * do debugfs initialization without mutex to avoid 372 * creating a locking dependency 373 */ 374 ceph_debugfs_client_init(monc->client); 375 } 376 377 goto out_unlocked; 378 } 379out: 380 mutex_unlock(&monc->mutex); 381out_unlocked: 382 wake_up_all(&client->auth_wq); 383} 384 385/* 386 * generic requests (e.g., statfs, poolop) 387 */ 388static struct ceph_mon_generic_request *__lookup_generic_req( 389 struct ceph_mon_client *monc, u64 tid) 390{ 391 struct ceph_mon_generic_request *req; 392 struct rb_node *n = monc->generic_request_tree.rb_node; 393 394 while (n) { 395 req = rb_entry(n, struct ceph_mon_generic_request, node); 396 if (tid < req->tid) 397 n = n->rb_left; 398 else if (tid > req->tid) 399 n = n->rb_right; 400 else 401 return req; 402 } 403 return NULL; 404} 405 406static void __insert_generic_request(struct ceph_mon_client *monc, 407 struct ceph_mon_generic_request *new) 408{ 409 struct rb_node **p = &monc->generic_request_tree.rb_node; 410 struct rb_node *parent = NULL; 411 struct ceph_mon_generic_request *req = NULL; 412 413 while (*p) { 414 parent = *p; 415 req = rb_entry(parent, struct ceph_mon_generic_request, node); 416 if (new->tid < req->tid) 417 p = &(*p)->rb_left; 418 else if (new->tid > req->tid) 419 p = &(*p)->rb_right; 420 else 421 BUG(); 422 } 423 424 rb_link_node(&new->node, parent, p); 425 rb_insert_color(&new->node, &monc->generic_request_tree); 426} 427 428static void release_generic_request(struct kref *kref) 429{ 430 struct ceph_mon_generic_request *req = 431 container_of(kref, struct ceph_mon_generic_request, kref); 432 433 if (req->reply) 434 ceph_msg_put(req->reply); 435 if (req->request) 436 ceph_msg_put(req->request); 437 438 kfree(req); 439} 440 441static void put_generic_request(struct ceph_mon_generic_request *req) 442{ 443 kref_put(&req->kref, release_generic_request); 444} 445 446static void get_generic_request(struct ceph_mon_generic_request *req) 447{ 448 kref_get(&req->kref); 449} 450 451static struct ceph_msg *get_generic_reply(struct ceph_connection *con, 452 struct ceph_msg_header *hdr, 453 int *skip) 454{ 455 struct ceph_mon_client *monc = con->private; 456 struct ceph_mon_generic_request *req; 457 u64 tid = le64_to_cpu(hdr->tid); 458 struct ceph_msg *m; 459 460 mutex_lock(&monc->mutex); 461 req = __lookup_generic_req(monc, tid); 462 if (!req) { 463 dout("get_generic_reply %lld dne\n", tid); 464 *skip = 1; 465 m = NULL; 466 } else { 467 dout("get_generic_reply %lld got %p\n", tid, req->reply); 468 *skip = 0; 469 m = ceph_msg_get(req->reply); 470 /* 471 * we don't need to track the connection reading into 472 * this reply because we only have one open connection 473 * at a time, ever. 474 */ 475 } 476 mutex_unlock(&monc->mutex); 477 return m; 478} 479 480static int do_generic_request(struct ceph_mon_client *monc, 481 struct ceph_mon_generic_request *req) 482{ 483 int err; 484 485 /* register request */ 486 mutex_lock(&monc->mutex); 487 req->tid = ++monc->last_tid; 488 req->request->hdr.tid = cpu_to_le64(req->tid); 489 __insert_generic_request(monc, req); 490 monc->num_generic_requests++; 491 ceph_con_send(&monc->con, ceph_msg_get(req->request)); 492 mutex_unlock(&monc->mutex); 493 494 err = wait_for_completion_interruptible(&req->completion); 495 496 mutex_lock(&monc->mutex); 497 rb_erase(&req->node, &monc->generic_request_tree); 498 monc->num_generic_requests--; 499 mutex_unlock(&monc->mutex); 500 501 if (!err) 502 err = req->result; 503 return err; 504} 505 506/* 507 * statfs 508 */ 509static void handle_statfs_reply(struct ceph_mon_client *monc, 510 struct ceph_msg *msg) 511{ 512 struct ceph_mon_generic_request *req; 513 struct ceph_mon_statfs_reply *reply = msg->front.iov_base; 514 u64 tid = le64_to_cpu(msg->hdr.tid); 515 516 if (msg->front.iov_len != sizeof(*reply)) 517 goto bad; 518 dout("handle_statfs_reply %p tid %llu\n", msg, tid); 519 520 mutex_lock(&monc->mutex); 521 req = __lookup_generic_req(monc, tid); 522 if (req) { 523 *(struct ceph_statfs *)req->buf = reply->st; 524 req->result = 0; 525 get_generic_request(req); 526 } 527 mutex_unlock(&monc->mutex); 528 if (req) { 529 complete_all(&req->completion); 530 put_generic_request(req); 531 } 532 return; 533 534bad: 535 pr_err("corrupt generic reply, tid %llu\n", tid); 536 ceph_msg_dump(msg); 537} 538 539/* 540 * Do a synchronous statfs(). 541 */ 542int ceph_monc_do_statfs(struct ceph_mon_client *monc, struct ceph_statfs *buf) 543{ 544 struct ceph_mon_generic_request *req; 545 struct ceph_mon_statfs *h; 546 int err; 547 548 req = kzalloc(sizeof(*req), GFP_NOFS); 549 if (!req) 550 return -ENOMEM; 551 552 kref_init(&req->kref); 553 req->buf = buf; 554 req->buf_len = sizeof(*buf); 555 init_completion(&req->completion); 556 557 err = -ENOMEM; 558 req->request = ceph_msg_new(CEPH_MSG_STATFS, sizeof(*h), GFP_NOFS, 559 true); 560 if (!req->request) 561 goto out; 562 req->reply = ceph_msg_new(CEPH_MSG_STATFS_REPLY, 1024, GFP_NOFS, 563 true); 564 if (!req->reply) 565 goto out; 566 567 /* fill out request */ 568 h = req->request->front.iov_base; 569 h->monhdr.have_version = 0; 570 h->monhdr.session_mon = cpu_to_le16(-1); 571 h->monhdr.session_mon_tid = 0; 572 h->fsid = monc->monmap->fsid; 573 574 err = do_generic_request(monc, req); 575 576out: 577 kref_put(&req->kref, release_generic_request); 578 return err; 579} 580EXPORT_SYMBOL(ceph_monc_do_statfs); 581 582/* 583 * pool ops 584 */ 585static int get_poolop_reply_buf(const char *src, size_t src_len, 586 char *dst, size_t dst_len) 587{ 588 u32 buf_len; 589 590 if (src_len != sizeof(u32) + dst_len) 591 return -EINVAL; 592 593 buf_len = le32_to_cpu(*(u32 *)src); 594 if (buf_len != dst_len) 595 return -EINVAL; 596 597 memcpy(dst, src + sizeof(u32), dst_len); 598 return 0; 599} 600 601static void handle_poolop_reply(struct ceph_mon_client *monc, 602 struct ceph_msg *msg) 603{ 604 struct ceph_mon_generic_request *req; 605 struct ceph_mon_poolop_reply *reply = msg->front.iov_base; 606 u64 tid = le64_to_cpu(msg->hdr.tid); 607 608 if (msg->front.iov_len < sizeof(*reply)) 609 goto bad; 610 dout("handle_poolop_reply %p tid %llu\n", msg, tid); 611 612 mutex_lock(&monc->mutex); 613 req = __lookup_generic_req(monc, tid); 614 if (req) { 615 if (req->buf_len && 616 get_poolop_reply_buf(msg->front.iov_base + sizeof(*reply), 617 msg->front.iov_len - sizeof(*reply), 618 req->buf, req->buf_len) < 0) { 619 mutex_unlock(&monc->mutex); 620 goto bad; 621 } 622 req->result = le32_to_cpu(reply->reply_code); 623 get_generic_request(req); 624 } 625 mutex_unlock(&monc->mutex); 626 if (req) { 627 complete(&req->completion); 628 put_generic_request(req); 629 } 630 return; 631 632bad: 633 pr_err("corrupt generic reply, tid %llu\n", tid); 634 ceph_msg_dump(msg); 635} 636 637/* 638 * Do a synchronous pool op. 639 */ 640int ceph_monc_do_poolop(struct ceph_mon_client *monc, u32 op, 641 u32 pool, u64 snapid, 642 char *buf, int len) 643{ 644 struct ceph_mon_generic_request *req; 645 struct ceph_mon_poolop *h; 646 int err; 647 648 req = kzalloc(sizeof(*req), GFP_NOFS); 649 if (!req) 650 return -ENOMEM; 651 652 kref_init(&req->kref); 653 req->buf = buf; 654 req->buf_len = len; 655 init_completion(&req->completion); 656 657 err = -ENOMEM; 658 req->request = ceph_msg_new(CEPH_MSG_POOLOP, sizeof(*h), GFP_NOFS, 659 true); 660 if (!req->request) 661 goto out; 662 req->reply = ceph_msg_new(CEPH_MSG_POOLOP_REPLY, 1024, GFP_NOFS, 663 true); 664 if (!req->reply) 665 goto out; 666 667 /* fill out request */ 668 req->request->hdr.version = cpu_to_le16(2); 669 h = req->request->front.iov_base; 670 h->monhdr.have_version = 0; 671 h->monhdr.session_mon = cpu_to_le16(-1); 672 h->monhdr.session_mon_tid = 0; 673 h->fsid = monc->monmap->fsid; 674 h->pool = cpu_to_le32(pool); 675 h->op = cpu_to_le32(op); 676 h->auid = 0; 677 h->snapid = cpu_to_le64(snapid); 678 h->name_len = 0; 679 680 err = do_generic_request(monc, req); 681 682out: 683 kref_put(&req->kref, release_generic_request); 684 return err; 685} 686 687int ceph_monc_create_snapid(struct ceph_mon_client *monc, 688 u32 pool, u64 *snapid) 689{ 690 return ceph_monc_do_poolop(monc, POOL_OP_CREATE_UNMANAGED_SNAP, 691 pool, 0, (char *)snapid, sizeof(*snapid)); 692 693} 694EXPORT_SYMBOL(ceph_monc_create_snapid); 695 696int ceph_monc_delete_snapid(struct ceph_mon_client *monc, 697 u32 pool, u64 snapid) 698{ 699 return ceph_monc_do_poolop(monc, POOL_OP_CREATE_UNMANAGED_SNAP, 700 pool, snapid, 0, 0); 701 702} 703 704/* 705 * Resend pending generic requests. 706 */ 707static void __resend_generic_request(struct ceph_mon_client *monc) 708{ 709 struct ceph_mon_generic_request *req; 710 struct rb_node *p; 711 712 for (p = rb_first(&monc->generic_request_tree); p; p = rb_next(p)) { 713 req = rb_entry(p, struct ceph_mon_generic_request, node); 714 ceph_msg_revoke(req->request); 715 ceph_msg_revoke_incoming(req->reply); 716 ceph_con_send(&monc->con, ceph_msg_get(req->request)); 717 } 718} 719 720/* 721 * Delayed work. If we haven't mounted yet, retry. Otherwise, 722 * renew/retry subscription as needed (in case it is timing out, or we 723 * got an ENOMEM). And keep the monitor connection alive. 724 */ 725static void delayed_work(struct work_struct *work) 726{ 727 struct ceph_mon_client *monc = 728 container_of(work, struct ceph_mon_client, delayed_work.work); 729 730 dout("monc delayed_work\n"); 731 mutex_lock(&monc->mutex); 732 if (monc->hunting) { 733 __close_session(monc); 734 __open_session(monc); /* continue hunting */ 735 } else { 736 ceph_con_keepalive(&monc->con); 737 738 __validate_auth(monc); 739 740 if (monc->auth->ops->is_authenticated(monc->auth)) 741 __send_subscribe(monc); 742 } 743 __schedule_delayed(monc); 744 mutex_unlock(&monc->mutex); 745} 746 747/* 748 * On startup, we build a temporary monmap populated with the IPs 749 * provided by mount(2). 750 */ 751static int build_initial_monmap(struct ceph_mon_client *monc) 752{ 753 struct ceph_options *opt = monc->client->options; 754 struct ceph_entity_addr *mon_addr = opt->mon_addr; 755 int num_mon = opt->num_mon; 756 int i; 757 758 /* build initial monmap */ 759 monc->monmap = kzalloc(sizeof(*monc->monmap) + 760 num_mon*sizeof(monc->monmap->mon_inst[0]), 761 GFP_KERNEL); 762 if (!monc->monmap) 763 return -ENOMEM; 764 for (i = 0; i < num_mon; i++) { 765 monc->monmap->mon_inst[i].addr = mon_addr[i]; 766 monc->monmap->mon_inst[i].addr.nonce = 0; 767 monc->monmap->mon_inst[i].name.type = 768 CEPH_ENTITY_TYPE_MON; 769 monc->monmap->mon_inst[i].name.num = cpu_to_le64(i); 770 } 771 monc->monmap->num_mon = num_mon; 772 monc->have_fsid = false; 773 return 0; 774} 775 776int ceph_monc_init(struct ceph_mon_client *monc, struct ceph_client *cl) 777{ 778 int err = 0; 779 780 dout("init\n"); 781 memset(monc, 0, sizeof(*monc)); 782 monc->client = cl; 783 monc->monmap = NULL; 784 mutex_init(&monc->mutex); 785 786 err = build_initial_monmap(monc); 787 if (err) 788 goto out; 789 790 /* connection */ 791 /* authentication */ 792 monc->auth = ceph_auth_init(cl->options->name, 793 cl->options->key); 794 if (IS_ERR(monc->auth)) { 795 err = PTR_ERR(monc->auth); 796 goto out_monmap; 797 } 798 monc->auth->want_keys = 799 CEPH_ENTITY_TYPE_AUTH | CEPH_ENTITY_TYPE_MON | 800 CEPH_ENTITY_TYPE_OSD | CEPH_ENTITY_TYPE_MDS; 801 802 /* msgs */ 803 err = -ENOMEM; 804 monc->m_subscribe_ack = ceph_msg_new(CEPH_MSG_MON_SUBSCRIBE_ACK, 805 sizeof(struct ceph_mon_subscribe_ack), 806 GFP_NOFS, true); 807 if (!monc->m_subscribe_ack) 808 goto out_auth; 809 810 monc->m_subscribe = ceph_msg_new(CEPH_MSG_MON_SUBSCRIBE, 96, GFP_NOFS, 811 true); 812 if (!monc->m_subscribe) 813 goto out_subscribe_ack; 814 815 monc->m_auth_reply = ceph_msg_new(CEPH_MSG_AUTH_REPLY, 4096, GFP_NOFS, 816 true); 817 if (!monc->m_auth_reply) 818 goto out_subscribe; 819 820 monc->m_auth = ceph_msg_new(CEPH_MSG_AUTH, 4096, GFP_NOFS, true); 821 monc->pending_auth = 0; 822 if (!monc->m_auth) 823 goto out_auth_reply; 824 825 ceph_con_init(&monc->con, monc, &mon_con_ops, 826 &monc->client->msgr); 827 828 monc->cur_mon = -1; 829 monc->hunting = true; 830 monc->sub_renew_after = jiffies; 831 monc->sub_sent = 0; 832 833 INIT_DELAYED_WORK(&monc->delayed_work, delayed_work); 834 monc->generic_request_tree = RB_ROOT; 835 monc->num_generic_requests = 0; 836 monc->last_tid = 0; 837 838 monc->have_mdsmap = 0; 839 monc->have_osdmap = 0; 840 monc->want_next_osdmap = 1; 841 return 0; 842 843out_auth_reply: 844 ceph_msg_put(monc->m_auth_reply); 845out_subscribe: 846 ceph_msg_put(monc->m_subscribe); 847out_subscribe_ack: 848 ceph_msg_put(monc->m_subscribe_ack); 849out_auth: 850 ceph_auth_destroy(monc->auth); 851out_monmap: 852 kfree(monc->monmap); 853out: 854 return err; 855} 856EXPORT_SYMBOL(ceph_monc_init); 857 858void ceph_monc_stop(struct ceph_mon_client *monc) 859{ 860 dout("stop\n"); 861 cancel_delayed_work_sync(&monc->delayed_work); 862 863 mutex_lock(&monc->mutex); 864 __close_session(monc); 865 866 mutex_unlock(&monc->mutex); 867 868 /* 869 * flush msgr queue before we destroy ourselves to ensure that: 870 * - any work that references our embedded con is finished. 871 * - any osd_client or other work that may reference an authorizer 872 * finishes before we shut down the auth subsystem. 873 */ 874 ceph_msgr_flush(); 875 876 ceph_auth_destroy(monc->auth); 877 878 ceph_msg_put(monc->m_auth); 879 ceph_msg_put(monc->m_auth_reply); 880 ceph_msg_put(monc->m_subscribe); 881 ceph_msg_put(monc->m_subscribe_ack); 882 883 kfree(monc->monmap); 884} 885EXPORT_SYMBOL(ceph_monc_stop); 886 887static void handle_auth_reply(struct ceph_mon_client *monc, 888 struct ceph_msg *msg) 889{ 890 int ret; 891 int was_auth = 0; 892 int had_debugfs_info, init_debugfs = 0; 893 894 mutex_lock(&monc->mutex); 895 had_debugfs_info = have_debugfs_info(monc); 896 if (monc->auth->ops) 897 was_auth = monc->auth->ops->is_authenticated(monc->auth); 898 monc->pending_auth = 0; 899 ret = ceph_handle_auth_reply(monc->auth, msg->front.iov_base, 900 msg->front.iov_len, 901 monc->m_auth->front.iov_base, 902 monc->m_auth->front_max); 903 if (ret < 0) { 904 monc->client->auth_err = ret; 905 wake_up_all(&monc->client->auth_wq); 906 } else if (ret > 0) { 907 __send_prepared_auth_request(monc, ret); 908 } else if (!was_auth && monc->auth->ops->is_authenticated(monc->auth)) { 909 dout("authenticated, starting session\n"); 910 911 monc->client->msgr.inst.name.type = CEPH_ENTITY_TYPE_CLIENT; 912 monc->client->msgr.inst.name.num = 913 cpu_to_le64(monc->auth->global_id); 914 915 __send_subscribe(monc); 916 __resend_generic_request(monc); 917 } 918 919 if (!had_debugfs_info && have_debugfs_info(monc)) { 920 pr_info("client%lld fsid %pU\n", 921 ceph_client_id(monc->client), 922 &monc->client->fsid); 923 init_debugfs = 1; 924 } 925 mutex_unlock(&monc->mutex); 926 927 if (init_debugfs) { 928 /* 929 * do debugfs initialization without mutex to avoid 930 * creating a locking dependency 931 */ 932 ceph_debugfs_client_init(monc->client); 933 } 934} 935 936static int __validate_auth(struct ceph_mon_client *monc) 937{ 938 int ret; 939 940 if (monc->pending_auth) 941 return 0; 942 943 ret = ceph_build_auth(monc->auth, monc->m_auth->front.iov_base, 944 monc->m_auth->front_max); 945 if (ret <= 0) 946 return ret; /* either an error, or no need to authenticate */ 947 __send_prepared_auth_request(monc, ret); 948 return 0; 949} 950 951int ceph_monc_validate_auth(struct ceph_mon_client *monc) 952{ 953 int ret; 954 955 mutex_lock(&monc->mutex); 956 ret = __validate_auth(monc); 957 mutex_unlock(&monc->mutex); 958 return ret; 959} 960EXPORT_SYMBOL(ceph_monc_validate_auth); 961 962/* 963 * handle incoming message 964 */ 965static void dispatch(struct ceph_connection *con, struct ceph_msg *msg) 966{ 967 struct ceph_mon_client *monc = con->private; 968 int type = le16_to_cpu(msg->hdr.type); 969 970 if (!monc) 971 return; 972 973 switch (type) { 974 case CEPH_MSG_AUTH_REPLY: 975 handle_auth_reply(monc, msg); 976 break; 977 978 case CEPH_MSG_MON_SUBSCRIBE_ACK: 979 handle_subscribe_ack(monc, msg); 980 break; 981 982 case CEPH_MSG_STATFS_REPLY: 983 handle_statfs_reply(monc, msg); 984 break; 985 986 case CEPH_MSG_POOLOP_REPLY: 987 handle_poolop_reply(monc, msg); 988 break; 989 990 case CEPH_MSG_MON_MAP: 991 ceph_monc_handle_map(monc, msg); 992 break; 993 994 case CEPH_MSG_OSD_MAP: 995 ceph_osdc_handle_map(&monc->client->osdc, msg); 996 break; 997 998 default: 999 /* can the chained handler handle it? */ 1000 if (monc->client->extra_mon_dispatch && 1001 monc->client->extra_mon_dispatch(monc->client, msg) == 0) 1002 break; 1003 1004 pr_err("received unknown message type %d %s\n", type, 1005 ceph_msg_type_name(type)); 1006 } 1007 ceph_msg_put(msg); 1008} 1009 1010/* 1011 * Allocate memory for incoming message 1012 */ 1013static struct ceph_msg *mon_alloc_msg(struct ceph_connection *con, 1014 struct ceph_msg_header *hdr, 1015 int *skip) 1016{ 1017 struct ceph_mon_client *monc = con->private; 1018 int type = le16_to_cpu(hdr->type); 1019 int front_len = le32_to_cpu(hdr->front_len); 1020 struct ceph_msg *m = NULL; 1021 1022 *skip = 0; 1023 1024 switch (type) { 1025 case CEPH_MSG_MON_SUBSCRIBE_ACK: 1026 m = ceph_msg_get(monc->m_subscribe_ack); 1027 break; 1028 case CEPH_MSG_POOLOP_REPLY: 1029 case CEPH_MSG_STATFS_REPLY: 1030 return get_generic_reply(con, hdr, skip); 1031 case CEPH_MSG_AUTH_REPLY: 1032 m = ceph_msg_get(monc->m_auth_reply); 1033 break; 1034 case CEPH_MSG_MON_MAP: 1035 case CEPH_MSG_MDS_MAP: 1036 case CEPH_MSG_OSD_MAP: 1037 m = ceph_msg_new(type, front_len, GFP_NOFS, false); 1038 if (!m) 1039 return NULL; /* ENOMEM--return skip == 0 */ 1040 break; 1041 } 1042 1043 if (!m) { 1044 pr_info("alloc_msg unknown type %d\n", type); 1045 *skip = 1; 1046 } 1047 return m; 1048} 1049 1050/* 1051 * If the monitor connection resets, pick a new monitor and resubmit 1052 * any pending requests. 1053 */ 1054static void mon_fault(struct ceph_connection *con) 1055{ 1056 struct ceph_mon_client *monc = con->private; 1057 1058 if (!monc) 1059 return; 1060 1061 dout("mon_fault\n"); 1062 mutex_lock(&monc->mutex); 1063 if (!con->private) 1064 goto out; 1065 1066 if (!monc->hunting) 1067 pr_info("mon%d %s session lost, " 1068 "hunting for new mon\n", monc->cur_mon, 1069 ceph_pr_addr(&monc->con.peer_addr.in_addr)); 1070 1071 __close_session(monc); 1072 if (!monc->hunting) { 1073 /* start hunting */ 1074 monc->hunting = true; 1075 __open_session(monc); 1076 } else { 1077 /* already hunting, let's wait a bit */ 1078 __schedule_delayed(monc); 1079 } 1080out: 1081 mutex_unlock(&monc->mutex); 1082} 1083 1084/* 1085 * We can ignore refcounting on the connection struct, as all references 1086 * will come from the messenger workqueue, which is drained prior to 1087 * mon_client destruction. 1088 */ 1089static struct ceph_connection *con_get(struct ceph_connection *con) 1090{ 1091 return con; 1092} 1093 1094static void con_put(struct ceph_connection *con) 1095{ 1096} 1097 1098static const struct ceph_connection_operations mon_con_ops = { 1099 .get = con_get, 1100 .put = con_put, 1101 .dispatch = dispatch, 1102 .fault = mon_fault, 1103 .alloc_msg = mon_alloc_msg, 1104}; 1105