net/ceph/ceph_common.c

   1
   2 #include <linux/ceph/ceph_debug.h>
   3 #include <linux/backing-dev.h>
   4 #include <linux/ctype.h>
   5 #include <linux/fs.h>
   6 #include <linux/inet.h>
   7 #include <linux/in6.h>
   8 #include <linux/key.h>
   9 #include <keys/ceph-type.h>
  10 #include <linux/module.h>
  11 #include <linux/mount.h>
  12 #include <linux/nsproxy.h>
  13 #include <linux/parser.h>
  14 #include <linux/sched.h>
  15 #include <linux/seq_file.h>
  16 #include <linux/slab.h>
  17 #include <linux/statfs.h>
  18 #include <linux/string.h>
  19 #include <linux/vmalloc.h>
  20
  21
  22 #include <linux/ceph/ceph_features.h>
  23 #include <linux/ceph/libceph.h>
  24 #include <linux/ceph/debugfs.h>
  25 #include <linux/ceph/decode.h>
  26 #include <linux/ceph/mon_client.h>
  27 #include <linux/ceph/auth.h>
  28 #include "crypto.h"
  29
  30
  31 /*
  32  * Module compatibility interface.  For now it doesn't do anything,
  33  * but its existence signals a certain level of functionality.
  34  *
  35  * The data buffer is used to pass information both to and from
  36  * libceph.  The return value indicates whether libceph determines
  37  * it is compatible with the caller (from another kernel module),
  38  * given the provided data.
  39  *
  40  * The data pointer can be null.
  41  */
  42 bool libceph_compatible(void *data)
  43 {
  44         return true;
  45 }
  46 EXPORT_SYMBOL(libceph_compatible);
  47
  48 /*
  49  * find filename portion of a path (/foo/bar/baz -> baz)
  50  */
  51 const char *ceph_file_part(const char *s, int len)
  52 {
  53         const char *e = s + len;
  54
  55         while (e != s && *(e-1) != '/')
  56                 e--;
  57         return e;
  58 }
  59 EXPORT_SYMBOL(ceph_file_part);
  60
  61 const char *ceph_msg_type_name(int type)
  62 {
  63         switch (type) {
  64         case CEPH_MSG_SHUTDOWN: return "shutdown";
  65         case CEPH_MSG_PING: return "ping";
  66         case CEPH_MSG_AUTH: return "auth";
  67         case CEPH_MSG_AUTH_REPLY: return "auth_reply";
  68         case CEPH_MSG_MON_MAP: return "mon_map";
  69         case CEPH_MSG_MON_GET_MAP: return "mon_get_map";
  70         case CEPH_MSG_MON_SUBSCRIBE: return "mon_subscribe";
  71         case CEPH_MSG_MON_SUBSCRIBE_ACK: return "mon_subscribe_ack";
  72         case CEPH_MSG_STATFS: return "statfs";
  73         case CEPH_MSG_STATFS_REPLY: return "statfs_reply";
  74         case CEPH_MSG_MON_GET_VERSION: return "mon_get_version";
  75         case CEPH_MSG_MON_GET_VERSION_REPLY: return "mon_get_version_reply";
  76         case CEPH_MSG_MDS_MAP: return "mds_map";
  77         case CEPH_MSG_CLIENT_SESSION: return "client_session";
  78         case CEPH_MSG_CLIENT_RECONNECT: return "client_reconnect";
  79         case CEPH_MSG_CLIENT_REQUEST: return "client_request";
  80         case CEPH_MSG_CLIENT_REQUEST_FORWARD: return "client_request_forward";
  81         case CEPH_MSG_CLIENT_REPLY: return "client_reply";
  82         case CEPH_MSG_CLIENT_CAPS: return "client_caps";
  83         case CEPH_MSG_CLIENT_CAPRELEASE: return "client_cap_release";
  84         case CEPH_MSG_CLIENT_SNAP: return "client_snap";
  85         case CEPH_MSG_CLIENT_LEASE: return "client_lease";
  86         case CEPH_MSG_OSD_MAP: return "osd_map";
  87         case CEPH_MSG_OSD_OP: return "osd_op";
  88         case CEPH_MSG_OSD_OPREPLY: return "osd_opreply";
  89         case CEPH_MSG_WATCH_NOTIFY: return "watch_notify";
  90         default: return "unknown";
  91         }
  92 }
  93 EXPORT_SYMBOL(ceph_msg_type_name);
  94
  95 /*
  96  * Initially learn our fsid, or verify an fsid matches.
  97  */
  98 int ceph_check_fsid(struct ceph_client *client, struct ceph_fsid *fsid)
  99 {
 100         if (client->have_fsid) {
 101                 if (ceph_fsid_compare(&client->fsid, fsid)) {
 102                         pr_err("bad fsid, had %pU got %pU",
 103                                &client->fsid, fsid);
 104                         return -1;
 105                 }
 106         } else {
 107                 memcpy(&client->fsid, fsid, sizeof(*fsid));
 108         }
 109         return 0;
 110 }
 111 EXPORT_SYMBOL(ceph_check_fsid);
 112
 113 static int strcmp_null(const char *s1, const char *s2)
 114 {
 115         if (!s1 && !s2)
 116                 return 0;
 117         if (s1 && !s2)
 118                 return -1;
 119         if (!s1 && s2)
 120                 return 1;
 121         return strcmp(s1, s2);
 122 }
 123
 124 int ceph_compare_options(struct ceph_options *new_opt,
 125                          struct ceph_client *client)
 126 {
 127         struct ceph_options *opt1 = new_opt;
 128         struct ceph_options *opt2 = client->options;
 129         int ofs = offsetof(struct ceph_options, mon_addr);
 130         int i;
 131         int ret;
 132
 133         /*
 134          * Don't bother comparing options if network namespaces don't
 135          * match.
 136          */
 137         if (!net_eq(current->nsproxy->net_ns, read_pnet(&client->msgr.net)))
 138                 return -1;
 139
 140         ret = memcmp(opt1, opt2, ofs);
 141         if (ret)
 142                 return ret;
 143
 144         ret = strcmp_null(opt1->name, opt2->name);
 145         if (ret)
 146                 return ret;
 147
 148         if (opt1->key && !opt2->key)
 149                 return -1;
 150         if (!opt1->key && opt2->key)
 151                 return 1;
 152         if (opt1->key && opt2->key) {
 153                 if (opt1->key->type != opt2->key->type)
 154                         return -1;
 155                 if (opt1->key->created.tv_sec != opt2->key->created.tv_sec)
 156                         return -1;
 157                 if (opt1->key->created.tv_nsec != opt2->key->created.tv_nsec)
 158                         return -1;
 159                 if (opt1->key->len != opt2->key->len)
 160                         return -1;
 161                 if (opt1->key->key && !opt2->key->key)
 162                         return -1;
 163                 if (!opt1->key->key && opt2->key->key)
 164                         return 1;
 165                 if (opt1->key->key && opt2->key->key) {
 166                         ret = memcmp(opt1->key->key, opt2->key->key, opt1->key->len);
 167                         if (ret)
 168                                 return ret;
 169                 }
 170         }
 171
 172         /* any matching mon ip implies a match */
 173         for (i = 0; i < opt1->num_mon; i++) {
 174                 if (ceph_monmap_contains(client->monc.monmap,
 175                                  &opt1->mon_addr[i]))
 176                         return 0;
 177         }
 178         return -1;
 179 }
 180 EXPORT_SYMBOL(ceph_compare_options);
 181
 182 void *ceph_kvmalloc(size_t size, gfp_t flags)
 183 {
 184         if (size <= (PAGE_SIZE << PAGE_ALLOC_COSTLY_ORDER)) {
 185                 void *ptr = kmalloc(size, flags | __GFP_NOWARN);
 186                 if (ptr)
 187                         return ptr;
 188         }
 189
 190         return __vmalloc(size, flags | __GFP_HIGHMEM, PAGE_KERNEL);
 191 }
 192
 193
 194 static int parse_fsid(const char *str, struct ceph_fsid *fsid)
 195 {
 196         int i = 0;
 197         char tmp[3];
 198         int err = -EINVAL;
 199         int d;
 200
 201         dout("parse_fsid '%s'\n", str);
 202         tmp[2] = 0;
 203         while (*str && i < 16) {
 204                 if (ispunct(*str)) {
 205                         str++;
 206                         continue;
 207                 }
 208                 if (!isxdigit(str[0]) || !isxdigit(str[1]))
 209                         break;
 210                 tmp[0] = str[0];
 211                 tmp[1] = str[1];
 212                 if (sscanf(tmp, "%x", &d) < 1)
 213                         break;
 214                 fsid->fsid[i] = d & 0xff;
 215                 i++;
 216                 str += 2;
 217         }
 218
 219         if (i == 16)
 220                 err = 0;
 221         dout("parse_fsid ret %d got fsid %pU", err, fsid);
 222         return err;
 223 }
 224
 225 /*
 226  * ceph options
 227  */
 228 enum {
 229         Opt_osdtimeout,
 230         Opt_osdkeepalivetimeout,
 231         Opt_mount_timeout,
 232         Opt_osd_idle_ttl,
 233         Opt_last_int,
 234         /* int args above */
 235         Opt_fsid,
 236         Opt_name,
 237         Opt_secret,
 238         Opt_key,
 239         Opt_ip,
 240         Opt_last_string,
 241         /* string args above */
 242         Opt_share,
 243         Opt_noshare,
 244         Opt_crc,
 245         Opt_nocrc,
 246         Opt_cephx_require_signatures,
 247         Opt_nocephx_require_signatures,
 248         Opt_tcp_nodelay,
 249         Opt_notcp_nodelay,
 250 };
 251
 252 static match_table_t opt_tokens = {
 253         {Opt_osdtimeout, "osdtimeout=%d"},
 254         {Opt_osdkeepalivetimeout, "osdkeepalive=%d"},
 255         {Opt_mount_timeout, "mount_timeout=%d"},
 256         {Opt_osd_idle_ttl, "osd_idle_ttl=%d"},
 257         /* int args above */
 258         {Opt_fsid, "fsid=%s"},
 259         {Opt_name, "name=%s"},
 260         {Opt_secret, "secret=%s"},
 261         {Opt_key, "key=%s"},
 262         {Opt_ip, "ip=%s"},
 263         /* string args above */
 264         {Opt_share, "share"},
 265         {Opt_noshare, "noshare"},
 266         {Opt_crc, "crc"},
 267         {Opt_nocrc, "nocrc"},
 268         {Opt_cephx_require_signatures, "cephx_require_signatures"},
 269         {Opt_nocephx_require_signatures, "nocephx_require_signatures"},
 270         {Opt_tcp_nodelay, "tcp_nodelay"},
 271         {Opt_notcp_nodelay, "notcp_nodelay"},
 272         {-1, NULL}
 273 };
 274
 275 void ceph_destroy_options(struct ceph_options *opt)
 276 {
 277         dout("destroy_options %p\n", opt);
 278         kfree(opt->name);
 279         if (opt->key) {
 280                 ceph_crypto_key_destroy(opt->key);
 281                 kfree(opt->key);
 282         }
 283         kfree(opt->mon_addr);
 284         kfree(opt);
 285 }
 286 EXPORT_SYMBOL(ceph_destroy_options);
 287
 288 /* get secret from key store */
 289 static int get_secret(struct ceph_crypto_key *dst, const char *name) {
 290         struct key *ukey;
 291         int key_err;
 292         int err = 0;
 293         struct ceph_crypto_key *ckey;
 294
 295         ukey = request_key(&key_type_ceph, name, NULL);
 296         if (!ukey || IS_ERR(ukey)) {
 297                 /* request_key errors don't map nicely to mount(2)
 298                    errors; don't even try, but still printk */
 299                 key_err = PTR_ERR(ukey);
 300                 switch (key_err) {
 301                 case -ENOKEY:
 302                         pr_warn("ceph: Mount failed due to key not found: %s\n",
 303                                 name);
 304                         break;
 305                 case -EKEYEXPIRED:
 306                         pr_warn("ceph: Mount failed due to expired key: %s\n",
 307                                 name);
 308                         break;
 309                 case -EKEYREVOKED:
 310                         pr_warn("ceph: Mount failed due to revoked key: %s\n",
 311                                 name);
 312                         break;
 313                 default:
 314                         pr_warn("ceph: Mount failed due to unknown key error %d: %s\n",
 315                                 key_err, name);
 316                 }
 317                 err = -EPERM;
 318                 goto out;
 319         }
 320
 321         ckey = ukey->payload.data;
 322         err = ceph_crypto_key_clone(dst, ckey);
 323         if (err)
 324                 goto out_key;
 325         /* pass through, err is 0 */
 326
 327 out_key:
 328         key_put(ukey);
 329 out:
 330         return err;
 331 }
 332
 333 struct ceph_options *
 334 ceph_parse_options(char *options, const char *dev_name,
 335                         const char *dev_name_end,
 336                         int (*parse_extra_token)(char *c, void *private),
 337                         void *private)
 338 {
 339         struct ceph_options *opt;
 340         const char *c;
 341         int err = -ENOMEM;
 342         substring_t argstr[MAX_OPT_ARGS];
 343
 344         opt = kzalloc(sizeof(*opt), GFP_KERNEL);
 345         if (!opt)
 346                 return ERR_PTR(-ENOMEM);
 347         opt->mon_addr = kcalloc(CEPH_MAX_MON, sizeof(*opt->mon_addr),
 348                                 GFP_KERNEL);
 349         if (!opt->mon_addr)
 350                 goto out;
 351
 352         dout("parse_options %p options '%s' dev_name '%s'\n", opt, options,
 353              dev_name);
 354
 355         /* start with defaults */
 356         opt->flags = CEPH_OPT_DEFAULT;
 357         opt->osd_keepalive_timeout = CEPH_OSD_KEEPALIVE_DEFAULT;
 358         opt->mount_timeout = CEPH_MOUNT_TIMEOUT_DEFAULT;
 359         opt->osd_idle_ttl = CEPH_OSD_IDLE_TTL_DEFAULT;
 360
 361         /* get mon ip(s) */
 362         /* ip1[:port1][,ip2[:port2]...] */
 363         err = ceph_parse_ips(dev_name, dev_name_end, opt->mon_addr,
 364                              CEPH_MAX_MON, &opt->num_mon);
 365         if (err < 0)
 366                 goto out;
 367
 368         /* parse mount options */
 369         while ((c = strsep(&options, ",")) != NULL) {
 370                 int token, intval, ret;
 371                 if (!*c)
 372                         continue;
 373                 err = -EINVAL;
 374                 token = match_token((char *)c, opt_tokens, argstr);
 375                 if (token < 0 && parse_extra_token) {
 376                         /* extra? */
 377                         err = parse_extra_token((char *)c, private);
 378                         if (err < 0) {
 379                                 pr_err("bad option at '%s'\n", c);
 380                                 goto out;
 381                         }
 382                         continue;
 383                 }
 384                 if (token < Opt_last_int) {
 385                         ret = match_int(&argstr[0], &intval);
 386                         if (ret < 0) {
 387                                 pr_err("bad mount option arg (not int) "
 388                                        "at '%s'\n", c);
 389                                 continue;
 390                         }
 391                         dout("got int token %d val %d\n", token, intval);
 392                 } else if (token > Opt_last_int && token < Opt_last_string) {
 393                         dout("got string token %d val %s\n", token,
 394                              argstr[0].from);
 395                 } else {
 396                         dout("got token %d\n", token);
 397                 }
 398                 switch (token) {
 399                 case Opt_ip:
 400                         err = ceph_parse_ips(argstr[0].from,
 401                                              argstr[0].to,
 402                                              &opt->my_addr,
 403                                              1, NULL);
 404                         if (err < 0)
 405                                 goto out;
 406                         opt->flags |= CEPH_OPT_MYIP;
 407                         break;
 408
 409                 case Opt_fsid:
 410                         err = parse_fsid(argstr[0].from, &opt->fsid);
 411                         if (err == 0)
 412                                 opt->flags |= CEPH_OPT_FSID;
 413                         break;
 414                 case Opt_name:
 415                         opt->name = kstrndup(argstr[0].from,
 416                                               argstr[0].to-argstr[0].from,
 417                                               GFP_KERNEL);
 418                         break;
 419                 case Opt_secret:
 420                         opt->key = kzalloc(sizeof(*opt->key), GFP_KERNEL);
 421                         if (!opt->key) {
 422                                 err = -ENOMEM;
 423                                 goto out;
 424                         }
 425                         err = ceph_crypto_key_unarmor(opt->key, argstr[0].from);
 426                         if (err < 0)
 427                                 goto out;
 428                         break;
 429                 case Opt_key:
 430                         opt->key = kzalloc(sizeof(*opt->key), GFP_KERNEL);
 431                         if (!opt->key) {
 432                                 err = -ENOMEM;
 433                                 goto out;
 434                         }
 435                         err = get_secret(opt->key, argstr[0].from);
 436                         if (err < 0)
 437                                 goto out;
 438                         break;
 439
 440                         /* misc */
 441                 case Opt_osdtimeout:
 442                         pr_warn("ignoring deprecated osdtimeout option\n");
 443                         break;
 444                 case Opt_osdkeepalivetimeout:
 445                         /* 0 isn't well defined right now, reject it */
 446                         if (intval < 1 || intval > INT_MAX / 1000) {
 447                                 pr_err("osdkeepalive out of range\n");
 448                                 err = -EINVAL;
 449                                 goto out;
 450                         }
 451                         opt->osd_keepalive_timeout =
 452                                         msecs_to_jiffies(intval * 1000);
 453                         break;
 454                 case Opt_osd_idle_ttl:
 455                         /* 0 isn't well defined right now, reject it */
 456                         if (intval < 1 || intval > INT_MAX / 1000) {
 457                                 pr_err("osd_idle_ttl out of range\n");
 458                                 err = -EINVAL;
 459                                 goto out;
 460                         }
 461                         opt->osd_idle_ttl = msecs_to_jiffies(intval * 1000);
 462                         break;
 463                 case Opt_mount_timeout:
 464                         /* 0 is "wait forever" (i.e. infinite timeout) */
 465                         if (intval < 0 || intval > INT_MAX / 1000) {
 466                                 pr_err("mount_timeout out of range\n");
 467                                 err = -EINVAL;
 468                                 goto out;
 469                         }
 470                         opt->mount_timeout = msecs_to_jiffies(intval * 1000);
 471                         break;
 472
 473                 case Opt_share:
 474                         opt->flags &= ~CEPH_OPT_NOSHARE;
 475                         break;
 476                 case Opt_noshare:
 477                         opt->flags |= CEPH_OPT_NOSHARE;
 478                         break;
 479
 480                 case Opt_crc:
 481                         opt->flags &= ~CEPH_OPT_NOCRC;
 482                         break;
 483                 case Opt_nocrc:
 484                         opt->flags |= CEPH_OPT_NOCRC;
 485                         break;
 486
 487                 case Opt_cephx_require_signatures:
 488                         opt->flags &= ~CEPH_OPT_NOMSGAUTH;
 489                         break;
 490                 case Opt_nocephx_require_signatures:
 491                         opt->flags |= CEPH_OPT_NOMSGAUTH;
 492                         break;
 493
 494                 case Opt_tcp_nodelay:
 495                         opt->flags |= CEPH_OPT_TCP_NODELAY;
 496                         break;
 497                 case Opt_notcp_nodelay:
 498                         opt->flags &= ~CEPH_OPT_TCP_NODELAY;
 499                         break;
 500
 501                 default:
 502                         BUG_ON(token);
 503                 }
 504         }
 505
 506         /* success */
 507         return opt;
 508
 509 out:
 510         ceph_destroy_options(opt);
 511         return ERR_PTR(err);
 512 }
 513 EXPORT_SYMBOL(ceph_parse_options);
 514
 515 int ceph_print_client_options(struct seq_file *m, struct ceph_client *client)
 516 {
 517         struct ceph_options *opt = client->options;
 518         size_t pos = m->count;
 519
 520         if (opt->name)
 521                 seq_printf(m, "name=%s,", opt->name);
 522         if (opt->key)
 523                 seq_puts(m, "secret=<hidden>,");
 524
 525         if (opt->flags & CEPH_OPT_FSID)
 526                 seq_printf(m, "fsid=%pU,", &opt->fsid);
 527         if (opt->flags & CEPH_OPT_NOSHARE)
 528                 seq_puts(m, "noshare,");
 529         if (opt->flags & CEPH_OPT_NOCRC)
 530                 seq_puts(m, "nocrc,");
 531         if (opt->flags & CEPH_OPT_NOMSGAUTH)
 532                 seq_puts(m, "nocephx_require_signatures,");
 533         if ((opt->flags & CEPH_OPT_TCP_NODELAY) == 0)
 534                 seq_puts(m, "notcp_nodelay,");
 535
 536         if (opt->mount_timeout != CEPH_MOUNT_TIMEOUT_DEFAULT)
 537                 seq_printf(m, "mount_timeout=%d,",
 538                            jiffies_to_msecs(opt->mount_timeout) / 1000);
 539         if (opt->osd_idle_ttl != CEPH_OSD_IDLE_TTL_DEFAULT)
 540                 seq_printf(m, "osd_idle_ttl=%d,",
 541                            jiffies_to_msecs(opt->osd_idle_ttl) / 1000);
 542         if (opt->osd_keepalive_timeout != CEPH_OSD_KEEPALIVE_DEFAULT)
 543                 seq_printf(m, "osdkeepalivetimeout=%d,",
 544                     jiffies_to_msecs(opt->osd_keepalive_timeout) / 1000);
 545
 546         /* drop redundant comma */
 547         if (m->count != pos)
 548                 m->count--;
 549
 550         return 0;
 551 }
 552 EXPORT_SYMBOL(ceph_print_client_options);
 553
 554 u64 ceph_client_id(struct ceph_client *client)
 555 {
 556         return client->monc.auth->global_id;
 557 }
 558 EXPORT_SYMBOL(ceph_client_id);
 559
 560 /*
 561  * create a fresh client instance
 562  */
 563 struct ceph_client *ceph_create_client(struct ceph_options *opt, void *private,
 564                                        u64 supported_features,
 565                                        u64 required_features)
 566 {
 567         struct ceph_client *client;
 568         struct ceph_entity_addr *myaddr = NULL;
 569         int err = -ENOMEM;
 570
 571         client = kzalloc(sizeof(*client), GFP_KERNEL);
 572         if (client == NULL)
 573                 return ERR_PTR(-ENOMEM);
 574
 575         client->private = private;
 576         client->options = opt;
 577
 578         mutex_init(&client->mount_mutex);
 579         init_waitqueue_head(&client->auth_wq);
 580         client->auth_err = 0;
 581
 582         if (!ceph_test_opt(client, NOMSGAUTH))
 583                 required_features |= CEPH_FEATURE_MSG_AUTH;
 584
 585         client->extra_mon_dispatch = NULL;
 586         client->supported_features = CEPH_FEATURES_SUPPORTED_DEFAULT |
 587                 supported_features;
 588         client->required_features = CEPH_FEATURES_REQUIRED_DEFAULT |
 589                 required_features;
 590
 591         /* msgr */
 592         if (ceph_test_opt(client, MYIP))
 593                 myaddr = &client->options->my_addr;
 594
 595         ceph_messenger_init(&client->msgr, myaddr,
 596                 client->supported_features,
 597                 client->required_features,
 598                 ceph_test_opt(client, NOCRC),
 599                 ceph_test_opt(client, TCP_NODELAY));
 600
 601         /* subsystems */
 602         err = ceph_monc_init(&client->monc, client);
 603         if (err < 0)
 604                 goto fail;
 605         err = ceph_osdc_init(&client->osdc, client);
 606         if (err < 0)
 607                 goto fail_monc;
 608
 609         return client;
 610
 611 fail_monc:
 612         ceph_monc_stop(&client->monc);
 613 fail:
 614         ceph_messenger_fini(&client->msgr);
 615         kfree(client);
 616         return ERR_PTR(err);
 617 }
 618 EXPORT_SYMBOL(ceph_create_client);
 619
 620 void ceph_destroy_client(struct ceph_client *client)
 621 {
 622         dout("destroy_client %p\n", client);
 623
 624         atomic_set(&client->msgr.stopping, 1);
 625
 626         /* unmount */
 627         ceph_osdc_stop(&client->osdc);
 628         ceph_monc_stop(&client->monc);
 629         ceph_messenger_fini(&client->msgr);
 630
 631         ceph_debugfs_client_cleanup(client);
 632
 633         ceph_destroy_options(client->options);
 634
 635         kfree(client);
 636         dout("destroy_client %p done\n", client);
 637 }
 638 EXPORT_SYMBOL(ceph_destroy_client);
 639
 640 /*
 641  * true if we have the mon map (and have thus joined the cluster)
 642  */
 643 static int have_mon_and_osd_map(struct ceph_client *client)
 644 {
 645         return client->monc.monmap && client->monc.monmap->epoch &&
 646                client->osdc.osdmap && client->osdc.osdmap->epoch;
 647 }
 648
 649 /*
 650  * mount: join the ceph cluster, and open root directory.
 651  */
 652 int __ceph_open_session(struct ceph_client *client, unsigned long started)
 653 {
 654         unsigned long timeout = client->options->mount_timeout;
 655         long err;
 656
 657         /* open session, and wait for mon and osd maps */
 658         err = ceph_monc_open_session(&client->monc);
 659         if (err < 0)
 660                 return err;
 661
 662         while (!have_mon_and_osd_map(client)) {
 663                 if (timeout && time_after_eq(jiffies, started + timeout))
 664                         return -ETIMEDOUT;
 665
 666                 /* wait */
 667                 dout("mount waiting for mon_map\n");
 668                 err = wait_event_interruptible_timeout(client->auth_wq,
 669                         have_mon_and_osd_map(client) || (client->auth_err < 0),
 670                         ceph_timeout_jiffies(timeout));
 671                 if (err < 0)
 672                         return err;
 673                 if (client->auth_err < 0)
 674                         return client->auth_err;
 675         }
 676
 677         return 0;
 678 }
 679 EXPORT_SYMBOL(__ceph_open_session);
 680
 681
 682 int ceph_open_session(struct ceph_client *client)
 683 {
 684         int ret;
 685         unsigned long started = jiffies;  /* note the start time */
 686
 687         dout("open_session start\n");
 688         mutex_lock(&client->mount_mutex);
 689
 690         ret = __ceph_open_session(client, started);
 691
 692         mutex_unlock(&client->mount_mutex);
 693         return ret;
 694 }
 695 EXPORT_SYMBOL(ceph_open_session);
 696
 697
 698 static int __init init_ceph_lib(void)
 699 {
 700         int ret = 0;
 701
 702         ret = ceph_debugfs_init();
 703         if (ret < 0)
 704                 goto out;
 705
 706         ret = ceph_crypto_init();
 707         if (ret < 0)
 708                 goto out_debugfs;
 709
 710         ret = ceph_msgr_init();
 711         if (ret < 0)
 712                 goto out_crypto;
 713
 714         ret = ceph_osdc_setup();
 715         if (ret < 0)
 716                 goto out_msgr;
 717
 718         pr_info("loaded (mon/osd proto %d/%d)\n",
 719                 CEPH_MONC_PROTOCOL, CEPH_OSDC_PROTOCOL);
 720
 721         return 0;
 722
 723 out_msgr:
 724         ceph_msgr_exit();
 725 out_crypto:
 726         ceph_crypto_shutdown();
 727 out_debugfs:
 728         ceph_debugfs_cleanup();
 729 out:
 730         return ret;
 731 }
 732
 733 static void __exit exit_ceph_lib(void)
 734 {
 735         dout("exit_ceph_lib\n");
 736         ceph_osdc_cleanup();
 737         ceph_msgr_exit();
 738         ceph_crypto_shutdown();
 739         ceph_debugfs_cleanup();
 740 }
 741
 742 module_init(init_ceph_lib);
 743 module_exit(exit_ceph_lib);
 744
 745 MODULE_AUTHOR("Sage Weil <sage@newdream.net>");
 746 MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>");
 747 MODULE_AUTHOR("Patience Warnick <patience@newdream.net>");
 748 MODULE_DESCRIPTION("Ceph core library");
 749 MODULE_LICENSE("GPL");