linux/net/ceph/mon_client.c
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   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 */
 640static int 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 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 do_poolop(monc,  POOL_OP_CREATE_UNMANAGED_SNAP,
 700                                   pool, snapid, NULL, 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 (ceph_auth_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        return 0;
 773}
 774
 775int ceph_monc_init(struct ceph_mon_client *monc, struct ceph_client *cl)
 776{
 777        int err = 0;
 778
 779        dout("init\n");
 780        memset(monc, 0, sizeof(*monc));
 781        monc->client = cl;
 782        monc->monmap = NULL;
 783        mutex_init(&monc->mutex);
 784
 785        err = build_initial_monmap(monc);
 786        if (err)
 787                goto out;
 788
 789        /* connection */
 790        /* authentication */
 791        monc->auth = ceph_auth_init(cl->options->name,
 792                                    cl->options->key);
 793        if (IS_ERR(monc->auth)) {
 794                err = PTR_ERR(monc->auth);
 795                goto out_monmap;
 796        }
 797        monc->auth->want_keys =
 798                CEPH_ENTITY_TYPE_AUTH | CEPH_ENTITY_TYPE_MON |
 799                CEPH_ENTITY_TYPE_OSD | CEPH_ENTITY_TYPE_MDS;
 800
 801        /* msgs */
 802        err = -ENOMEM;
 803        monc->m_subscribe_ack = ceph_msg_new(CEPH_MSG_MON_SUBSCRIBE_ACK,
 804                                     sizeof(struct ceph_mon_subscribe_ack),
 805                                     GFP_NOFS, true);
 806        if (!monc->m_subscribe_ack)
 807                goto out_auth;
 808
 809        monc->m_subscribe = ceph_msg_new(CEPH_MSG_MON_SUBSCRIBE, 96, GFP_NOFS,
 810                                         true);
 811        if (!monc->m_subscribe)
 812                goto out_subscribe_ack;
 813
 814        monc->m_auth_reply = ceph_msg_new(CEPH_MSG_AUTH_REPLY, 4096, GFP_NOFS,
 815                                          true);
 816        if (!monc->m_auth_reply)
 817                goto out_subscribe;
 818
 819        monc->m_auth = ceph_msg_new(CEPH_MSG_AUTH, 4096, GFP_NOFS, true);
 820        monc->pending_auth = 0;
 821        if (!monc->m_auth)
 822                goto out_auth_reply;
 823
 824        ceph_con_init(&monc->con, monc, &mon_con_ops,
 825                      &monc->client->msgr);
 826
 827        monc->cur_mon = -1;
 828        monc->hunting = true;
 829        monc->sub_renew_after = jiffies;
 830        monc->sub_sent = 0;
 831
 832        INIT_DELAYED_WORK(&monc->delayed_work, delayed_work);
 833        monc->generic_request_tree = RB_ROOT;
 834        monc->num_generic_requests = 0;
 835        monc->last_tid = 0;
 836
 837        monc->have_mdsmap = 0;
 838        monc->have_osdmap = 0;
 839        monc->want_next_osdmap = 1;
 840        return 0;
 841
 842out_auth_reply:
 843        ceph_msg_put(monc->m_auth_reply);
 844out_subscribe:
 845        ceph_msg_put(monc->m_subscribe);
 846out_subscribe_ack:
 847        ceph_msg_put(monc->m_subscribe_ack);
 848out_auth:
 849        ceph_auth_destroy(monc->auth);
 850out_monmap:
 851        kfree(monc->monmap);
 852out:
 853        return err;
 854}
 855EXPORT_SYMBOL(ceph_monc_init);
 856
 857void ceph_monc_stop(struct ceph_mon_client *monc)
 858{
 859        dout("stop\n");
 860        cancel_delayed_work_sync(&monc->delayed_work);
 861
 862        mutex_lock(&monc->mutex);
 863        __close_session(monc);
 864
 865        mutex_unlock(&monc->mutex);
 866
 867        /*
 868         * flush msgr queue before we destroy ourselves to ensure that:
 869         *  - any work that references our embedded con is finished.
 870         *  - any osd_client or other work that may reference an authorizer
 871         *    finishes before we shut down the auth subsystem.
 872         */
 873        ceph_msgr_flush();
 874
 875        ceph_auth_destroy(monc->auth);
 876
 877        ceph_msg_put(monc->m_auth);
 878        ceph_msg_put(monc->m_auth_reply);
 879        ceph_msg_put(monc->m_subscribe);
 880        ceph_msg_put(monc->m_subscribe_ack);
 881
 882        kfree(monc->monmap);
 883}
 884EXPORT_SYMBOL(ceph_monc_stop);
 885
 886static void handle_auth_reply(struct ceph_mon_client *monc,
 887                              struct ceph_msg *msg)
 888{
 889        int ret;
 890        int was_auth = 0;
 891        int had_debugfs_info, init_debugfs = 0;
 892
 893        mutex_lock(&monc->mutex);
 894        had_debugfs_info = have_debugfs_info(monc);
 895        was_auth = ceph_auth_is_authenticated(monc->auth);
 896        monc->pending_auth = 0;
 897        ret = ceph_handle_auth_reply(monc->auth, msg->front.iov_base,
 898                                     msg->front.iov_len,
 899                                     monc->m_auth->front.iov_base,
 900                                     monc->m_auth->front_max);
 901        if (ret < 0) {
 902                monc->client->auth_err = ret;
 903                wake_up_all(&monc->client->auth_wq);
 904        } else if (ret > 0) {
 905                __send_prepared_auth_request(monc, ret);
 906        } else if (!was_auth && ceph_auth_is_authenticated(monc->auth)) {
 907                dout("authenticated, starting session\n");
 908
 909                monc->client->msgr.inst.name.type = CEPH_ENTITY_TYPE_CLIENT;
 910                monc->client->msgr.inst.name.num =
 911                                        cpu_to_le64(monc->auth->global_id);
 912
 913                __send_subscribe(monc);
 914                __resend_generic_request(monc);
 915        }
 916
 917        if (!had_debugfs_info && have_debugfs_info(monc)) {
 918                pr_info("client%lld fsid %pU\n",
 919                        ceph_client_id(monc->client),
 920                        &monc->client->fsid);
 921                init_debugfs = 1;
 922        }
 923        mutex_unlock(&monc->mutex);
 924
 925        if (init_debugfs) {
 926                /*
 927                 * do debugfs initialization without mutex to avoid
 928                 * creating a locking dependency
 929                 */
 930                ceph_debugfs_client_init(monc->client);
 931        }
 932}
 933
 934static int __validate_auth(struct ceph_mon_client *monc)
 935{
 936        int ret;
 937
 938        if (monc->pending_auth)
 939                return 0;
 940
 941        ret = ceph_build_auth(monc->auth, monc->m_auth->front.iov_base,
 942                              monc->m_auth->front_max);
 943        if (ret <= 0)
 944                return ret; /* either an error, or no need to authenticate */
 945        __send_prepared_auth_request(monc, ret);
 946        return 0;
 947}
 948
 949int ceph_monc_validate_auth(struct ceph_mon_client *monc)
 950{
 951        int ret;
 952
 953        mutex_lock(&monc->mutex);
 954        ret = __validate_auth(monc);
 955        mutex_unlock(&monc->mutex);
 956        return ret;
 957}
 958EXPORT_SYMBOL(ceph_monc_validate_auth);
 959
 960/*
 961 * handle incoming message
 962 */
 963static void dispatch(struct ceph_connection *con, struct ceph_msg *msg)
 964{
 965        struct ceph_mon_client *monc = con->private;
 966        int type = le16_to_cpu(msg->hdr.type);
 967
 968        if (!monc)
 969                return;
 970
 971        switch (type) {
 972        case CEPH_MSG_AUTH_REPLY:
 973                handle_auth_reply(monc, msg);
 974                break;
 975
 976        case CEPH_MSG_MON_SUBSCRIBE_ACK:
 977                handle_subscribe_ack(monc, msg);
 978                break;
 979
 980        case CEPH_MSG_STATFS_REPLY:
 981                handle_statfs_reply(monc, msg);
 982                break;
 983
 984        case CEPH_MSG_POOLOP_REPLY:
 985                handle_poolop_reply(monc, msg);
 986                break;
 987
 988        case CEPH_MSG_MON_MAP:
 989                ceph_monc_handle_map(monc, msg);
 990                break;
 991
 992        case CEPH_MSG_OSD_MAP:
 993                ceph_osdc_handle_map(&monc->client->osdc, msg);
 994                break;
 995
 996        default:
 997                /* can the chained handler handle it? */
 998                if (monc->client->extra_mon_dispatch &&
 999                    monc->client->extra_mon_dispatch(monc->client, msg) == 0)
1000                        break;
1001                        
1002                pr_err("received unknown message type %d %s\n", type,
1003                       ceph_msg_type_name(type));
1004        }
1005        ceph_msg_put(msg);
1006}
1007
1008/*
1009 * Allocate memory for incoming message
1010 */
1011static struct ceph_msg *mon_alloc_msg(struct ceph_connection *con,
1012                                      struct ceph_msg_header *hdr,
1013                                      int *skip)
1014{
1015        struct ceph_mon_client *monc = con->private;
1016        int type = le16_to_cpu(hdr->type);
1017        int front_len = le32_to_cpu(hdr->front_len);
1018        struct ceph_msg *m = NULL;
1019
1020        *skip = 0;
1021
1022        switch (type) {
1023        case CEPH_MSG_MON_SUBSCRIBE_ACK:
1024                m = ceph_msg_get(monc->m_subscribe_ack);
1025                break;
1026        case CEPH_MSG_POOLOP_REPLY:
1027        case CEPH_MSG_STATFS_REPLY:
1028                return get_generic_reply(con, hdr, skip);
1029        case CEPH_MSG_AUTH_REPLY:
1030                m = ceph_msg_get(monc->m_auth_reply);
1031                break;
1032        case CEPH_MSG_MON_MAP:
1033        case CEPH_MSG_MDS_MAP:
1034        case CEPH_MSG_OSD_MAP:
1035                m = ceph_msg_new(type, front_len, GFP_NOFS, false);
1036                if (!m)
1037                        return NULL;    /* ENOMEM--return skip == 0 */
1038                break;
1039        }
1040
1041        if (!m) {
1042                pr_info("alloc_msg unknown type %d\n", type);
1043                *skip = 1;
1044        }
1045        return m;
1046}
1047
1048/*
1049 * If the monitor connection resets, pick a new monitor and resubmit
1050 * any pending requests.
1051 */
1052static void mon_fault(struct ceph_connection *con)
1053{
1054        struct ceph_mon_client *monc = con->private;
1055
1056        if (!monc)
1057                return;
1058
1059        dout("mon_fault\n");
1060        mutex_lock(&monc->mutex);
1061        if (!con->private)
1062                goto out;
1063
1064        if (!monc->hunting)
1065                pr_info("mon%d %s session lost, "
1066                        "hunting for new mon\n", monc->cur_mon,
1067                        ceph_pr_addr(&monc->con.peer_addr.in_addr));
1068
1069        __close_session(monc);
1070        if (!monc->hunting) {
1071                /* start hunting */
1072                monc->hunting = true;
1073                __open_session(monc);
1074        } else {
1075                /* already hunting, let's wait a bit */
1076                __schedule_delayed(monc);
1077        }
1078out:
1079        mutex_unlock(&monc->mutex);
1080}
1081
1082/*
1083 * We can ignore refcounting on the connection struct, as all references
1084 * will come from the messenger workqueue, which is drained prior to
1085 * mon_client destruction.
1086 */
1087static struct ceph_connection *con_get(struct ceph_connection *con)
1088{
1089        return con;
1090}
1091
1092static void con_put(struct ceph_connection *con)
1093{
1094}
1095
1096static const struct ceph_connection_operations mon_con_ops = {
1097        .get = con_get,
1098        .put = con_put,
1099        .dispatch = dispatch,
1100        .fault = mon_fault,
1101        .alloc_msg = mon_alloc_msg,
1102};
1103
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