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 static int param_get_supported_features(char *buffer,
  49                                         const struct kernel_param *kp)
  50 {
  51         return sprintf(buffer, "0x%llx", CEPH_FEATURES_SUPPORTED_DEFAULT);
  52 }
  53 static const struct kernel_param_ops param_ops_supported_features = {
  54         .get = param_get_supported_features,
  55 };
  56 module_param_cb(supported_features, &param_ops_supported_features, NULL,
  57                 S_IRUGO);
  58
  59 const char *ceph_msg_type_name(int type)
  60 {
  61         switch (type) {
  62         case CEPH_MSG_SHUTDOWN: return "shutdown";
  63         case CEPH_MSG_PING: return "ping";
  64         case CEPH_MSG_AUTH: return "auth";
  65         case CEPH_MSG_AUTH_REPLY: return "auth_reply";
  66         case CEPH_MSG_MON_MAP: return "mon_map";
  67         case CEPH_MSG_MON_GET_MAP: return "mon_get_map";
  68         case CEPH_MSG_MON_SUBSCRIBE: return "mon_subscribe";
  69         case CEPH_MSG_MON_SUBSCRIBE_ACK: return "mon_subscribe_ack";
  70         case CEPH_MSG_STATFS: return "statfs";
  71         case CEPH_MSG_STATFS_REPLY: return "statfs_reply";
  72         case CEPH_MSG_MON_GET_VERSION: return "mon_get_version";
  73         case CEPH_MSG_MON_GET_VERSION_REPLY: return "mon_get_version_reply";
  74         case CEPH_MSG_MDS_MAP: return "mds_map";
  75         case CEPH_MSG_CLIENT_SESSION: return "client_session";
  76         case CEPH_MSG_CLIENT_RECONNECT: return "client_reconnect";
  77         case CEPH_MSG_CLIENT_REQUEST: return "client_request";
  78         case CEPH_MSG_CLIENT_REQUEST_FORWARD: return "client_request_forward";
  79         case CEPH_MSG_CLIENT_REPLY: return "client_reply";
  80         case CEPH_MSG_CLIENT_CAPS: return "client_caps";
  81         case CEPH_MSG_CLIENT_CAPRELEASE: return "client_cap_release";
  82         case CEPH_MSG_CLIENT_SNAP: return "client_snap";
  83         case CEPH_MSG_CLIENT_LEASE: return "client_lease";
  84         case CEPH_MSG_OSD_MAP: return "osd_map";
  85         case CEPH_MSG_OSD_OP: return "osd_op";
  86         case CEPH_MSG_OSD_OPREPLY: return "osd_opreply";
  87         case CEPH_MSG_WATCH_NOTIFY: return "watch_notify";
  88         case CEPH_MSG_OSD_BACKOFF: return "osd_backoff";
  89         default: return "unknown";
  90         }
  91 }
  92 EXPORT_SYMBOL(ceph_msg_type_name);
  93
  94 /*
  95  * Initially learn our fsid, or verify an fsid matches.
  96  */
  97 int ceph_check_fsid(struct ceph_client *client, struct ceph_fsid *fsid)
  98 {
  99         if (client->have_fsid) {
 100                 if (ceph_fsid_compare(&client->fsid, fsid)) {
 101                         pr_err("bad fsid, had %pU got %pU",
 102                                &client->fsid, fsid);
 103                         return -1;
 104                 }
 105         } else {
 106                 memcpy(&client->fsid, fsid, sizeof(*fsid));
 107         }
 108         return 0;
 109 }
 110 EXPORT_SYMBOL(ceph_check_fsid);
 111
 112 static int strcmp_null(const char *s1, const char *s2)
 113 {
 114         if (!s1 && !s2)
 115                 return 0;
 116         if (s1 && !s2)
 117                 return -1;
 118         if (!s1 && s2)
 119                 return 1;
 120         return strcmp(s1, s2);
 121 }
 122
 123 int ceph_compare_options(struct ceph_options *new_opt,
 124                          struct ceph_client *client)
 125 {
 126         struct ceph_options *opt1 = new_opt;
 127         struct ceph_options *opt2 = client->options;
 128         int ofs = offsetof(struct ceph_options, mon_addr);
 129         int i;
 130         int ret;
 131
 132         /*
 133          * Don't bother comparing options if network namespaces don't
 134          * match.
 135          */
 136         if (!net_eq(current->nsproxy->net_ns, read_pnet(&client->msgr.net)))
 137                 return -1;
 138
 139         ret = memcmp(opt1, opt2, ofs);
 140         if (ret)
 141                 return ret;
 142
 143         ret = strcmp_null(opt1->name, opt2->name);
 144         if (ret)
 145                 return ret;
 146
 147         if (opt1->key && !opt2->key)
 148                 return -1;
 149         if (!opt1->key && opt2->key)
 150                 return 1;
 151         if (opt1->key && opt2->key) {
 152                 if (opt1->key->type != opt2->key->type)
 153                         return -1;
 154                 if (opt1->key->created.tv_sec != opt2->key->created.tv_sec)
 155                         return -1;
 156                 if (opt1->key->created.tv_nsec != opt2->key->created.tv_nsec)
 157                         return -1;
 158                 if (opt1->key->len != opt2->key->len)
 159                         return -1;
 160                 if (opt1->key->key && !opt2->key->key)
 161                         return -1;
 162                 if (!opt1->key->key && opt2->key->key)
 163                         return 1;
 164                 if (opt1->key->key && opt2->key->key) {
 165                         ret = memcmp(opt1->key->key, opt2->key->key, opt1->key->len);
 166                         if (ret)
 167                                 return ret;
 168                 }
 169         }
 170
 171         /* any matching mon ip implies a match */
 172         for (i = 0; i < opt1->num_mon; i++) {
 173                 if (ceph_monmap_contains(client->monc.monmap,
 174                                  &opt1->mon_addr[i]))
 175                         return 0;
 176         }
 177         return -1;
 178 }
 179 EXPORT_SYMBOL(ceph_compare_options);
 180
 181 void *ceph_kvmalloc(size_t size, gfp_t flags)
 182 {
 183         if (size <= (PAGE_SIZE << PAGE_ALLOC_COSTLY_ORDER)) {
 184                 void *ptr = kmalloc(size, flags | __GFP_NOWARN);
 185                 if (ptr)
 186                         return ptr;
 187         }
 188
 189         return __vmalloc(size, flags, PAGE_KERNEL);
 190 }
 191
 192
 193 static int parse_fsid(const char *str, struct ceph_fsid *fsid)
 194 {
 195         int i = 0;
 196         char tmp[3];
 197         int err = -EINVAL;
 198         int d;
 199
 200         dout("parse_fsid '%s'\n", str);
 201         tmp[2] = 0;
 202         while (*str && i < 16) {
 203                 if (ispunct(*str)) {
 204                         str++;
 205                         continue;
 206                 }
 207                 if (!isxdigit(str[0]) || !isxdigit(str[1]))
 208                         break;
 209                 tmp[0] = str[0];
 210                 tmp[1] = str[1];
 211                 if (sscanf(tmp, "%x", &d) < 1)
 212                         break;
 213                 fsid->fsid[i] = d & 0xff;
 214                 i++;
 215                 str += 2;
 216         }
 217
 218         if (i == 16)
 219                 err = 0;
 220         dout("parse_fsid ret %d got fsid %pU", err, fsid);
 221         return err;
 222 }
 223
 224 /*
 225  * ceph options
 226  */
 227 enum {
 228         Opt_osdtimeout,
 229         Opt_osdkeepalivetimeout,
 230         Opt_mount_timeout,
 231         Opt_osd_idle_ttl,
 232         Opt_osd_request_timeout,
 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_cephx_sign_messages,
 249         Opt_nocephx_sign_messages,
 250         Opt_tcp_nodelay,
 251         Opt_notcp_nodelay,
 252 };
 253
 254 static match_table_t opt_tokens = {
 255         {Opt_osdtimeout, "osdtimeout=%d"},
 256         {Opt_osdkeepalivetimeout, "osdkeepalive=%d"},
 257         {Opt_mount_timeout, "mount_timeout=%d"},
 258         {Opt_osd_idle_ttl, "osd_idle_ttl=%d"},
 259         {Opt_osd_request_timeout, "osd_request_timeout=%d"},
 260         /* int args above */
 261         {Opt_fsid, "fsid=%s"},
 262         {Opt_name, "name=%s"},
 263         {Opt_secret, "secret=%s"},
 264         {Opt_key, "key=%s"},
 265         {Opt_ip, "ip=%s"},
 266         /* string args above */
 267         {Opt_share, "share"},
 268         {Opt_noshare, "noshare"},
 269         {Opt_crc, "crc"},
 270         {Opt_nocrc, "nocrc"},
 271         {Opt_cephx_require_signatures, "cephx_require_signatures"},
 272         {Opt_nocephx_require_signatures, "nocephx_require_signatures"},
 273         {Opt_cephx_sign_messages, "cephx_sign_messages"},
 274         {Opt_nocephx_sign_messages, "nocephx_sign_messages"},
 275         {Opt_tcp_nodelay, "tcp_nodelay"},
 276         {Opt_notcp_nodelay, "notcp_nodelay"},
 277         {-1, NULL}
 278 };
 279
 280 void ceph_destroy_options(struct ceph_options *opt)
 281 {
 282         dout("destroy_options %p\n", opt);
 283         kfree(opt->name);
 284         if (opt->key) {
 285                 ceph_crypto_key_destroy(opt->key);
 286                 kfree(opt->key);
 287         }
 288         kfree(opt->mon_addr);
 289         kfree(opt);
 290 }
 291 EXPORT_SYMBOL(ceph_destroy_options);
 292
 293 /* get secret from key store */
 294 static int get_secret(struct ceph_crypto_key *dst, const char *name) {
 295         struct key *ukey;
 296         int key_err;
 297         int err = 0;
 298         struct ceph_crypto_key *ckey;
 299
 300         ukey = request_key(&key_type_ceph, name, NULL);
 301         if (!ukey || IS_ERR(ukey)) {
 302                 /* request_key errors don't map nicely to mount(2)
 303                    errors; don't even try, but still printk */
 304                 key_err = PTR_ERR(ukey);
 305                 switch (key_err) {
 306                 case -ENOKEY:
 307                         pr_warn("ceph: Mount failed due to key not found: %s\n",
 308                                 name);
 309                         break;
 310                 case -EKEYEXPIRED:
 311                         pr_warn("ceph: Mount failed due to expired key: %s\n",
 312                                 name);
 313                         break;
 314                 case -EKEYREVOKED:
 315                         pr_warn("ceph: Mount failed due to revoked key: %s\n",
 316                                 name);
 317                         break;
 318                 default:
 319                         pr_warn("ceph: Mount failed due to unknown key error %d: %s\n",
 320                                 key_err, name);
 321                 }
 322                 err = -EPERM;
 323                 goto out;
 324         }
 325
 326         ckey = ukey->payload.data[0];
 327         err = ceph_crypto_key_clone(dst, ckey);
 328         if (err)
 329                 goto out_key;
 330         /* pass through, err is 0 */
 331
 332 out_key:
 333         key_put(ukey);
 334 out:
 335         return err;
 336 }
 337
 338 struct ceph_options *
 339 ceph_parse_options(char *options, const char *dev_name,
 340                         const char *dev_name_end,
 341                         int (*parse_extra_token)(char *c, void *private),
 342                         void *private)
 343 {
 344         struct ceph_options *opt;
 345         const char *c;
 346         int err = -ENOMEM;
 347         substring_t argstr[MAX_OPT_ARGS];
 348
 349         opt = kzalloc(sizeof(*opt), GFP_KERNEL);
 350         if (!opt)
 351                 return ERR_PTR(-ENOMEM);
 352         opt->mon_addr = kcalloc(CEPH_MAX_MON, sizeof(*opt->mon_addr),
 353                                 GFP_KERNEL);
 354         if (!opt->mon_addr)
 355                 goto out;
 356
 357         dout("parse_options %p options '%s' dev_name '%s'\n", opt, options,
 358              dev_name);
 359
 360         /* start with defaults */
 361         opt->flags = CEPH_OPT_DEFAULT;
 362         opt->osd_keepalive_timeout = CEPH_OSD_KEEPALIVE_DEFAULT;
 363         opt->mount_timeout = CEPH_MOUNT_TIMEOUT_DEFAULT;
 364         opt->osd_idle_ttl = CEPH_OSD_IDLE_TTL_DEFAULT;
 365         opt->osd_request_timeout = CEPH_OSD_REQUEST_TIMEOUT_DEFAULT;
 366
 367         /* get mon ip(s) */
 368         /* ip1[:port1][,ip2[:port2]...] */
 369         err = ceph_parse_ips(dev_name, dev_name_end, opt->mon_addr,
 370                              CEPH_MAX_MON, &opt->num_mon);
 371         if (err < 0)
 372                 goto out;
 373
 374         /* parse mount options */
 375         while ((c = strsep(&options, ",")) != NULL) {
 376                 int token, intval, ret;
 377                 if (!*c)
 378                         continue;
 379                 err = -EINVAL;
 380                 token = match_token((char *)c, opt_tokens, argstr);
 381                 if (token < 0 && parse_extra_token) {
 382                         /* extra? */
 383                         err = parse_extra_token((char *)c, private);
 384                         if (err < 0) {
 385                                 pr_err("bad option at '%s'\n", c);
 386                                 goto out;
 387                         }
 388                         continue;
 389                 }
 390                 if (token < Opt_last_int) {
 391                         ret = match_int(&argstr[0], &intval);
 392                         if (ret < 0) {
 393                                 pr_err("bad mount option arg (not int) "
 394                                        "at '%s'\n", c);
 395                                 continue;
 396                         }
 397                         dout("got int token %d val %d\n", token, intval);
 398                 } else if (token > Opt_last_int && token < Opt_last_string) {
 399                         dout("got string token %d val %s\n", token,
 400                              argstr[0].from);
 401                 } else {
 402                         dout("got token %d\n", token);
 403                 }
 404                 switch (token) {
 405                 case Opt_ip:
 406                         err = ceph_parse_ips(argstr[0].from,
 407                                              argstr[0].to,
 408                                              &opt->my_addr,
 409                                              1, NULL);
 410                         if (err < 0)
 411                                 goto out;
 412                         opt->flags |= CEPH_OPT_MYIP;
 413                         break;
 414
 415                 case Opt_fsid:
 416                         err = parse_fsid(argstr[0].from, &opt->fsid);
 417                         if (err == 0)
 418                                 opt->flags |= CEPH_OPT_FSID;
 419                         break;
 420                 case Opt_name:
 421                         opt->name = kstrndup(argstr[0].from,
 422                                               argstr[0].to-argstr[0].from,
 423                                               GFP_KERNEL);
 424                         break;
 425                 case Opt_secret:
 426                         opt->key = kzalloc(sizeof(*opt->key), GFP_KERNEL);
 427                         if (!opt->key) {
 428                                 err = -ENOMEM;
 429                                 goto out;
 430                         }
 431                         err = ceph_crypto_key_unarmor(opt->key, argstr[0].from);
 432                         if (err < 0)
 433                                 goto out;
 434                         break;
 435                 case Opt_key:
 436                         opt->key = kzalloc(sizeof(*opt->key), GFP_KERNEL);
 437                         if (!opt->key) {
 438                                 err = -ENOMEM;
 439                                 goto out;
 440                         }
 441                         err = get_secret(opt->key, argstr[0].from);
 442                         if (err < 0)
 443                                 goto out;
 444                         break;
 445
 446                         /* misc */
 447                 case Opt_osdtimeout:
 448                         pr_warn("ignoring deprecated osdtimeout option\n");
 449                         break;
 450                 case Opt_osdkeepalivetimeout:
 451                         /* 0 isn't well defined right now, reject it */
 452                         if (intval < 1 || intval > INT_MAX / 1000) {
 453                                 pr_err("osdkeepalive out of range\n");
 454                                 err = -EINVAL;
 455                                 goto out;
 456                         }
 457                         opt->osd_keepalive_timeout =
 458                                         msecs_to_jiffies(intval * 1000);
 459                         break;
 460                 case Opt_osd_idle_ttl:
 461                         /* 0 isn't well defined right now, reject it */
 462                         if (intval < 1 || intval > INT_MAX / 1000) {
 463                                 pr_err("osd_idle_ttl out of range\n");
 464                                 err = -EINVAL;
 465                                 goto out;
 466                         }
 467                         opt->osd_idle_ttl = msecs_to_jiffies(intval * 1000);
 468                         break;
 469                 case Opt_mount_timeout:
 470                         /* 0 is "wait forever" (i.e. infinite timeout) */
 471                         if (intval < 0 || intval > INT_MAX / 1000) {
 472                                 pr_err("mount_timeout out of range\n");
 473                                 err = -EINVAL;
 474                                 goto out;
 475                         }
 476                         opt->mount_timeout = msecs_to_jiffies(intval * 1000);
 477                         break;
 478                 case Opt_osd_request_timeout:
 479                         /* 0 is "wait forever" (i.e. infinite timeout) */
 480                         if (intval < 0 || intval > INT_MAX / 1000) {
 481                                 pr_err("osd_request_timeout out of range\n");
 482                                 err = -EINVAL;
 483                                 goto out;
 484                         }
 485                         opt->osd_request_timeout = msecs_to_jiffies(intval * 1000);
 486                         break;
 487
 488                 case Opt_share:
 489                         opt->flags &= ~CEPH_OPT_NOSHARE;
 490                         break;
 491                 case Opt_noshare:
 492                         opt->flags |= CEPH_OPT_NOSHARE;
 493                         break;
 494
 495                 case Opt_crc:
 496                         opt->flags &= ~CEPH_OPT_NOCRC;
 497                         break;
 498                 case Opt_nocrc:
 499                         opt->flags |= CEPH_OPT_NOCRC;
 500                         break;
 501
 502                 case Opt_cephx_require_signatures:
 503                         opt->flags &= ~CEPH_OPT_NOMSGAUTH;
 504                         break;
 505                 case Opt_nocephx_require_signatures:
 506                         opt->flags |= CEPH_OPT_NOMSGAUTH;
 507                         break;
 508                 case Opt_cephx_sign_messages:
 509                         opt->flags &= ~CEPH_OPT_NOMSGSIGN;
 510                         break;
 511                 case Opt_nocephx_sign_messages:
 512                         opt->flags |= CEPH_OPT_NOMSGSIGN;
 513                         break;
 514
 515                 case Opt_tcp_nodelay:
 516                         opt->flags |= CEPH_OPT_TCP_NODELAY;
 517                         break;
 518                 case Opt_notcp_nodelay:
 519                         opt->flags &= ~CEPH_OPT_TCP_NODELAY;
 520                         break;
 521
 522                 default:
 523                         BUG_ON(token);
 524                 }
 525         }
 526
 527         /* success */
 528         return opt;
 529
 530 out:
 531         ceph_destroy_options(opt);
 532         return ERR_PTR(err);
 533 }
 534 EXPORT_SYMBOL(ceph_parse_options);
 535
 536 int ceph_print_client_options(struct seq_file *m, struct ceph_client *client)
 537 {
 538         struct ceph_options *opt = client->options;
 539         size_t pos = m->count;
 540
 541         if (opt->name) {
 542                 seq_puts(m, "name=");
 543                 seq_escape(m, opt->name, ", \t\n\\");
 544                 seq_putc(m, ',');
 545         }
 546         if (opt->key)
 547                 seq_puts(m, "secret=<hidden>,");
 548
 549         if (opt->flags & CEPH_OPT_FSID)
 550                 seq_printf(m, "fsid=%pU,", &opt->fsid);
 551         if (opt->flags & CEPH_OPT_NOSHARE)
 552                 seq_puts(m, "noshare,");
 553         if (opt->flags & CEPH_OPT_NOCRC)
 554                 seq_puts(m, "nocrc,");
 555         if (opt->flags & CEPH_OPT_NOMSGAUTH)
 556                 seq_puts(m, "nocephx_require_signatures,");
 557         if (opt->flags & CEPH_OPT_NOMSGSIGN)
 558                 seq_puts(m, "nocephx_sign_messages,");
 559         if ((opt->flags & CEPH_OPT_TCP_NODELAY) == 0)
 560                 seq_puts(m, "notcp_nodelay,");
 561
 562         if (opt->mount_timeout != CEPH_MOUNT_TIMEOUT_DEFAULT)
 563                 seq_printf(m, "mount_timeout=%d,",
 564                            jiffies_to_msecs(opt->mount_timeout) / 1000);
 565         if (opt->osd_idle_ttl != CEPH_OSD_IDLE_TTL_DEFAULT)
 566                 seq_printf(m, "osd_idle_ttl=%d,",
 567                            jiffies_to_msecs(opt->osd_idle_ttl) / 1000);
 568         if (opt->osd_keepalive_timeout != CEPH_OSD_KEEPALIVE_DEFAULT)
 569                 seq_printf(m, "osdkeepalivetimeout=%d,",
 570                     jiffies_to_msecs(opt->osd_keepalive_timeout) / 1000);
 571         if (opt->osd_request_timeout != CEPH_OSD_REQUEST_TIMEOUT_DEFAULT)
 572                 seq_printf(m, "osd_request_timeout=%d,",
 573                            jiffies_to_msecs(opt->osd_request_timeout) / 1000);
 574
 575         /* drop redundant comma */
 576         if (m->count != pos)
 577                 m->count--;
 578
 579         return 0;
 580 }
 581 EXPORT_SYMBOL(ceph_print_client_options);
 582
 583 struct ceph_entity_addr *ceph_client_addr(struct ceph_client *client)
 584 {
 585         return &client->msgr.inst.addr;
 586 }
 587 EXPORT_SYMBOL(ceph_client_addr);
 588
 589 u64 ceph_client_gid(struct ceph_client *client)
 590 {
 591         return client->monc.auth->global_id;
 592 }
 593 EXPORT_SYMBOL(ceph_client_gid);
 594
 595 /*
 596  * create a fresh client instance
 597  */
 598 struct ceph_client *ceph_create_client(struct ceph_options *opt, void *private)
 599 {
 600         struct ceph_client *client;
 601         struct ceph_entity_addr *myaddr = NULL;
 602         int err;
 603
 604         err = wait_for_random_bytes();
 605         if (err < 0)
 606                 return ERR_PTR(err);
 607
 608         client = kzalloc(sizeof(*client), GFP_KERNEL);
 609         if (client == NULL)
 610                 return ERR_PTR(-ENOMEM);
 611
 612         client->private = private;
 613         client->options = opt;
 614
 615         mutex_init(&client->mount_mutex);
 616         init_waitqueue_head(&client->auth_wq);
 617         client->auth_err = 0;
 618
 619         client->extra_mon_dispatch = NULL;
 620         client->supported_features = CEPH_FEATURES_SUPPORTED_DEFAULT;
 621         client->required_features = CEPH_FEATURES_REQUIRED_DEFAULT;
 622
 623         if (!ceph_test_opt(client, NOMSGAUTH))
 624                 client->required_features |= CEPH_FEATURE_MSG_AUTH;
 625
 626         /* msgr */
 627         if (ceph_test_opt(client, MYIP))
 628                 myaddr = &client->options->my_addr;
 629
 630         ceph_messenger_init(&client->msgr, myaddr);
 631
 632         /* subsystems */
 633         err = ceph_monc_init(&client->monc, client);
 634         if (err < 0)
 635                 goto fail;
 636         err = ceph_osdc_init(&client->osdc, client);
 637         if (err < 0)
 638                 goto fail_monc;
 639
 640         return client;
 641
 642 fail_monc:
 643         ceph_monc_stop(&client->monc);
 644 fail:
 645         ceph_messenger_fini(&client->msgr);
 646         kfree(client);
 647         return ERR_PTR(err);
 648 }
 649 EXPORT_SYMBOL(ceph_create_client);
 650
 651 void ceph_destroy_client(struct ceph_client *client)
 652 {
 653         dout("destroy_client %p\n", client);
 654
 655         atomic_set(&client->msgr.stopping, 1);
 656
 657         /* unmount */
 658         ceph_osdc_stop(&client->osdc);
 659         ceph_monc_stop(&client->monc);
 660         ceph_messenger_fini(&client->msgr);
 661
 662         ceph_debugfs_client_cleanup(client);
 663
 664         ceph_destroy_options(client->options);
 665
 666         kfree(client);
 667         dout("destroy_client %p done\n", client);
 668 }
 669 EXPORT_SYMBOL(ceph_destroy_client);
 670
 671 /*
 672  * true if we have the mon map (and have thus joined the cluster)
 673  */
 674 static bool have_mon_and_osd_map(struct ceph_client *client)
 675 {
 676         return client->monc.monmap && client->monc.monmap->epoch &&
 677                client->osdc.osdmap && client->osdc.osdmap->epoch;
 678 }
 679
 680 /*
 681  * mount: join the ceph cluster, and open root directory.
 682  */
 683 int __ceph_open_session(struct ceph_client *client, unsigned long started)
 684 {
 685         unsigned long timeout = client->options->mount_timeout;
 686         long err;
 687
 688         /* open session, and wait for mon and osd maps */
 689         err = ceph_monc_open_session(&client->monc);
 690         if (err < 0)
 691                 return err;
 692
 693         while (!have_mon_and_osd_map(client)) {
 694                 if (timeout && time_after_eq(jiffies, started + timeout))
 695                         return -ETIMEDOUT;
 696
 697                 /* wait */
 698                 dout("mount waiting for mon_map\n");
 699                 err = wait_event_interruptible_timeout(client->auth_wq,
 700                         have_mon_and_osd_map(client) || (client->auth_err < 0),
 701                         ceph_timeout_jiffies(timeout));
 702                 if (err < 0)
 703                         return err;
 704                 if (client->auth_err < 0)
 705                         return client->auth_err;
 706         }
 707
 708         pr_info("client%llu fsid %pU\n", ceph_client_gid(client),
 709                 &client->fsid);
 710         ceph_debugfs_client_init(client);
 711
 712         return 0;
 713 }
 714 EXPORT_SYMBOL(__ceph_open_session);
 715
 716
 717 int ceph_open_session(struct ceph_client *client)
 718 {
 719         int ret;
 720         unsigned long started = jiffies;  /* note the start time */
 721
 722         dout("open_session start\n");
 723         mutex_lock(&client->mount_mutex);
 724
 725         ret = __ceph_open_session(client, started);
 726
 727         mutex_unlock(&client->mount_mutex);
 728         return ret;
 729 }
 730 EXPORT_SYMBOL(ceph_open_session);
 731
 732
 733 static int __init init_ceph_lib(void)
 734 {
 735         int ret = 0;
 736
 737         ret = ceph_debugfs_init();
 738         if (ret < 0)
 739                 goto out;
 740
 741         ret = ceph_crypto_init();
 742         if (ret < 0)
 743                 goto out_debugfs;
 744
 745         ret = ceph_msgr_init();
 746         if (ret < 0)
 747                 goto out_crypto;
 748
 749         ret = ceph_osdc_setup();
 750         if (ret < 0)
 751                 goto out_msgr;
 752
 753         pr_info("loaded (mon/osd proto %d/%d)\n",
 754                 CEPH_MONC_PROTOCOL, CEPH_OSDC_PROTOCOL);
 755
 756         return 0;
 757
 758 out_msgr:
 759         ceph_msgr_exit();
 760 out_crypto:
 761         ceph_crypto_shutdown();
 762 out_debugfs:
 763         ceph_debugfs_cleanup();
 764 out:
 765         return ret;
 766 }
 767
 768 static void __exit exit_ceph_lib(void)
 769 {
 770         dout("exit_ceph_lib\n");
 771         WARN_ON(!ceph_strings_empty());
 772
 773         ceph_osdc_cleanup();
 774         ceph_msgr_exit();
 775         ceph_crypto_shutdown();
 776         ceph_debugfs_cleanup();
 777 }
 778
 779 module_init(init_ceph_lib);
 780 module_exit(exit_ceph_lib);
 781
 782 MODULE_AUTHOR("Sage Weil <sage@newdream.net>");
 783 MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>");
 784 MODULE_AUTHOR("Patience Warnick <patience@newdream.net>");
 785 MODULE_DESCRIPTION("Ceph core library");
 786 MODULE_LICENSE("GPL");