net/ceph/mon_client.c

   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
  33 static const struct ceph_connection_operations mon_con_ops;
  34
  35 static int __validate_auth(struct ceph_mon_client *monc);
  36
  37 /*
  38  * Decode a monmap blob (e.g., during mount).
  39  */
  40 struct 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
  82 bad:
  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  */
  91 int 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  */
 104 static 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  */
 117 static 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  */
 130 static 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
 161 static 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  */
 169 static 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  */
 184 static 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
 236 static 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;
 258 bad:
 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  */
 266 int 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 }
 273 EXPORT_SYMBOL(ceph_monc_got_mdsmap);
 274
 275 int 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  */
 287 void 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  */
 301 int 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 }
 309 EXPORT_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  */
 315 static 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         }
 353 out:
 354         mutex_unlock(&monc->mutex);
 355 out_unlocked:
 356         wake_up_all(&client->auth_wq);
 357 }
 358
 359 /*
 360  * generic requests (e.g., statfs, poolop)
 361  */
 362 static 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
 380 static 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
 402 static 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
 415 static void put_generic_request(struct ceph_mon_generic_request *req)
 416 {
 417         kref_put(&req->kref, release_generic_request);
 418 }
 419
 420 static void get_generic_request(struct ceph_mon_generic_request *req)
 421 {
 422         kref_get(&req->kref);
 423 }
 424
 425 static 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
 453 static 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  */
 482 static 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
 507 bad:
 508         pr_err("corrupt generic reply, tid %llu\n", tid);
 509         ceph_msg_dump(msg);
 510 }
 511
 512 /*
 513  * Do a synchronous statfs().
 514  */
 515 int 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
 549 out:
 550         kref_put(&req->kref, release_generic_request);
 551         return err;
 552 }
 553 EXPORT_SYMBOL(ceph_monc_do_statfs);
 554
 555 /*
 556  * pool ops
 557  */
 558 static 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
 574 static 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
 605 bad:
 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  */
 613 int 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
 655 out:
 656         kref_put(&req->kref, release_generic_request);
 657         return err;
 658 }
 659
 660 int 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 }
 667 EXPORT_SYMBOL(ceph_monc_create_snapid);
 668
 669 int 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  */
 680 static 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  */
 697 static 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  */
 723 static 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
 748 int 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         monc->con = kmalloc(sizeof(*monc->con), GFP_KERNEL);
 764         if (!monc->con)
 765                 goto out_monmap;
 766         ceph_con_init(monc->client->msgr, monc->con);
 767         monc->con->private = monc;
 768         monc->con->ops = &mon_con_ops;
 769
 770         /* authentication */
 771         monc->auth = ceph_auth_init(cl->options->name,
 772                                     cl->options->key);
 773         if (IS_ERR(monc->auth)) {
 774                 err = PTR_ERR(monc->auth);
 775                 goto out_con;
 776         }
 777         monc->auth->want_keys =
 778                 CEPH_ENTITY_TYPE_AUTH | CEPH_ENTITY_TYPE_MON |
 779                 CEPH_ENTITY_TYPE_OSD | CEPH_ENTITY_TYPE_MDS;
 780
 781         /* msgs */
 782         err = -ENOMEM;
 783         monc->m_subscribe_ack = ceph_msg_new(CEPH_MSG_MON_SUBSCRIBE_ACK,
 784                                      sizeof(struct ceph_mon_subscribe_ack),
 785                                      GFP_NOFS, true);
 786         if (!monc->m_subscribe_ack)
 787                 goto out_auth;
 788
 789         monc->m_subscribe = ceph_msg_new(CEPH_MSG_MON_SUBSCRIBE, 96, GFP_NOFS,
 790                                          true);
 791         if (!monc->m_subscribe)
 792                 goto out_subscribe_ack;
 793
 794         monc->m_auth_reply = ceph_msg_new(CEPH_MSG_AUTH_REPLY, 4096, GFP_NOFS,
 795                                           true);
 796         if (!monc->m_auth_reply)
 797                 goto out_subscribe;
 798
 799         monc->m_auth = ceph_msg_new(CEPH_MSG_AUTH, 4096, GFP_NOFS, true);
 800         monc->pending_auth = 0;
 801         if (!monc->m_auth)
 802                 goto out_auth_reply;
 803
 804         monc->cur_mon = -1;
 805         monc->hunting = true;
 806         monc->sub_renew_after = jiffies;
 807         monc->sub_sent = 0;
 808
 809         INIT_DELAYED_WORK(&monc->delayed_work, delayed_work);
 810         monc->generic_request_tree = RB_ROOT;
 811         monc->num_generic_requests = 0;
 812         monc->last_tid = 0;
 813
 814         monc->have_mdsmap = 0;
 815         monc->have_osdmap = 0;
 816         monc->want_next_osdmap = 1;
 817         return 0;
 818
 819 out_auth_reply:
 820         ceph_msg_put(monc->m_auth_reply);
 821 out_subscribe:
 822         ceph_msg_put(monc->m_subscribe);
 823 out_subscribe_ack:
 824         ceph_msg_put(monc->m_subscribe_ack);
 825 out_auth:
 826         ceph_auth_destroy(monc->auth);
 827 out_con:
 828         monc->con->ops->put(monc->con);
 829 out_monmap:
 830         kfree(monc->monmap);
 831 out:
 832         return err;
 833 }
 834 EXPORT_SYMBOL(ceph_monc_init);
 835
 836 void ceph_monc_stop(struct ceph_mon_client *monc)
 837 {
 838         dout("stop\n");
 839         cancel_delayed_work_sync(&monc->delayed_work);
 840
 841         mutex_lock(&monc->mutex);
 842         __close_session(monc);
 843
 844         monc->con->private = NULL;
 845         monc->con->ops->put(monc->con);
 846         monc->con = NULL;
 847
 848         mutex_unlock(&monc->mutex);
 849
 850         ceph_auth_destroy(monc->auth);
 851
 852         ceph_msg_put(monc->m_auth);
 853         ceph_msg_put(monc->m_auth_reply);
 854         ceph_msg_put(monc->m_subscribe);
 855         ceph_msg_put(monc->m_subscribe_ack);
 856
 857         kfree(monc->monmap);
 858 }
 859 EXPORT_SYMBOL(ceph_monc_stop);
 860
 861 static void handle_auth_reply(struct ceph_mon_client *monc,
 862                               struct ceph_msg *msg)
 863 {
 864         int ret;
 865         int was_auth = 0;
 866
 867         mutex_lock(&monc->mutex);
 868         if (monc->auth->ops)
 869                 was_auth = monc->auth->ops->is_authenticated(monc->auth);
 870         monc->pending_auth = 0;
 871         ret = ceph_handle_auth_reply(monc->auth, msg->front.iov_base,
 872                                      msg->front.iov_len,
 873                                      monc->m_auth->front.iov_base,
 874                                      monc->m_auth->front_max);
 875         if (ret < 0) {
 876                 monc->client->auth_err = ret;
 877                 wake_up_all(&monc->client->auth_wq);
 878         } else if (ret > 0) {
 879                 __send_prepared_auth_request(monc, ret);
 880         } else if (!was_auth && monc->auth->ops->is_authenticated(monc->auth)) {
 881                 dout("authenticated, starting session\n");
 882
 883                 monc->client->msgr->inst.name.type = CEPH_ENTITY_TYPE_CLIENT;
 884                 monc->client->msgr->inst.name.num =
 885                                         cpu_to_le64(monc->auth->global_id);
 886
 887                 __send_subscribe(monc);
 888                 __resend_generic_request(monc);
 889         }
 890         mutex_unlock(&monc->mutex);
 891 }
 892
 893 static int __validate_auth(struct ceph_mon_client *monc)
 894 {
 895         int ret;
 896
 897         if (monc->pending_auth)
 898                 return 0;
 899
 900         ret = ceph_build_auth(monc->auth, monc->m_auth->front.iov_base,
 901                               monc->m_auth->front_max);
 902         if (ret <= 0)
 903                 return ret; /* either an error, or no need to authenticate */
 904         __send_prepared_auth_request(monc, ret);
 905         return 0;
 906 }
 907
 908 int ceph_monc_validate_auth(struct ceph_mon_client *monc)
 909 {
 910         int ret;
 911
 912         mutex_lock(&monc->mutex);
 913         ret = __validate_auth(monc);
 914         mutex_unlock(&monc->mutex);
 915         return ret;
 916 }
 917 EXPORT_SYMBOL(ceph_monc_validate_auth);
 918
 919 /*
 920  * handle incoming message
 921  */
 922 static void dispatch(struct ceph_connection *con, struct ceph_msg *msg)
 923 {
 924         struct ceph_mon_client *monc = con->private;
 925         int type = le16_to_cpu(msg->hdr.type);
 926
 927         if (!monc)
 928                 return;
 929
 930         switch (type) {
 931         case CEPH_MSG_AUTH_REPLY:
 932                 handle_auth_reply(monc, msg);
 933                 break;
 934
 935         case CEPH_MSG_MON_SUBSCRIBE_ACK:
 936                 handle_subscribe_ack(monc, msg);
 937                 break;
 938
 939         case CEPH_MSG_STATFS_REPLY:
 940                 handle_statfs_reply(monc, msg);
 941                 break;
 942
 943         case CEPH_MSG_POOLOP_REPLY:
 944                 handle_poolop_reply(monc, msg);
 945                 break;
 946
 947         case CEPH_MSG_MON_MAP:
 948                 ceph_monc_handle_map(monc, msg);
 949                 break;
 950
 951         case CEPH_MSG_OSD_MAP:
 952                 ceph_osdc_handle_map(&monc->client->osdc, msg);
 953                 break;
 954
 955         default:
 956                 /* can the chained handler handle it? */
 957                 if (monc->client->extra_mon_dispatch &&
 958                     monc->client->extra_mon_dispatch(monc->client, msg) == 0)
 959                         break;
 960
 961                 pr_err("received unknown message type %d %s\n", type,
 962                        ceph_msg_type_name(type));
 963         }
 964         ceph_msg_put(msg);
 965 }
 966
 967 /*
 968  * Allocate memory for incoming message
 969  */
 970 static struct ceph_msg *mon_alloc_msg(struct ceph_connection *con,
 971                                       struct ceph_msg_header *hdr,
 972                                       int *skip)
 973 {
 974         struct ceph_mon_client *monc = con->private;
 975         int type = le16_to_cpu(hdr->type);
 976         int front_len = le32_to_cpu(hdr->front_len);
 977         struct ceph_msg *m = NULL;
 978
 979         *skip = 0;
 980
 981         switch (type) {
 982         case CEPH_MSG_MON_SUBSCRIBE_ACK:
 983                 m = ceph_msg_get(monc->m_subscribe_ack);
 984                 break;
 985         case CEPH_MSG_POOLOP_REPLY:
 986         case CEPH_MSG_STATFS_REPLY:
 987                 return get_generic_reply(con, hdr, skip);
 988         case CEPH_MSG_AUTH_REPLY:
 989                 m = ceph_msg_get(monc->m_auth_reply);
 990                 break;
 991         case CEPH_MSG_MON_MAP:
 992         case CEPH_MSG_MDS_MAP:
 993         case CEPH_MSG_OSD_MAP:
 994                 m = ceph_msg_new(type, front_len, GFP_NOFS, false);
 995                 break;
 996         }
 997
 998         if (!m) {
 999                 pr_info("alloc_msg unknown type %d\n", type);
1000                 *skip = 1;
1001         }
1002         return m;
1003 }
1004
1005 /*
1006  * If the monitor connection resets, pick a new monitor and resubmit
1007  * any pending requests.
1008  */
1009 static void mon_fault(struct ceph_connection *con)
1010 {
1011         struct ceph_mon_client *monc = con->private;
1012
1013         if (!monc)
1014                 return;
1015
1016         dout("mon_fault\n");
1017         mutex_lock(&monc->mutex);
1018         if (!con->private)
1019                 goto out;
1020
1021         if (!monc->hunting)
1022                 pr_info("mon%d %s session lost, "
1023                         "hunting for new mon\n", monc->cur_mon,
1024                         ceph_pr_addr(&monc->con->peer_addr.in_addr));
1025
1026         __close_session(monc);
1027         if (!monc->hunting) {
1028                 /* start hunting */
1029                 monc->hunting = true;
1030                 __open_session(monc);
1031         } else {
1032                 /* already hunting, let's wait a bit */
1033                 __schedule_delayed(monc);
1034         }
1035 out:
1036         mutex_unlock(&monc->mutex);
1037 }
1038
1039 static const struct ceph_connection_operations mon_con_ops = {
1040         .get = ceph_con_get,
1041         .put = ceph_con_put,
1042         .dispatch = dispatch,
1043         .fault = mon_fault,
1044         .alloc_msg = mon_alloc_msg,
1045 };