ceph/src/tools/rbd/action/Kernel.cc

   1 // -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
   2 // vim: ts=8 sw=2 smarttab
   3
   4 #include "acconfig.h"
   5 #include "tools/rbd/ArgumentTypes.h"
   6 #include "tools/rbd/Shell.h"
   7 #include "tools/rbd/Utils.h"
   8 #include "include/krbd.h"
   9 #include "include/stringify.h"
  10 #include "include/uuid.h"
  11 #include "common/config.h"
  12 #include "common/errno.h"
  13 #include "common/safe_io.h"
  14 #include "common/strtol.h"
  15 #include "common/Formatter.h"
  16 #include "msg/msg_types.h"
  17 #include "global/global_context.h"
  18 #include <iostream>
  19 #include <boost/algorithm/string/predicate.hpp>
  20 #include <boost/scope_exit.hpp>
  21 #include <boost/program_options.hpp>
  22
  23 namespace rbd {
  24 namespace action {
  25 namespace kernel {
  26
  27 namespace at = argument_types;
  28 namespace po = boost::program_options;
  29
  30 namespace {
  31
  32 std::map<std::string, std::string> map_options; // used for both map and unmap
  33
  34 } // anonymous namespace
  35
  36 static std::string map_option_uuid_cb(const char *value_char)
  37 {
  38   uuid_d u;
  39   if (!u.parse(value_char))
  40     return "";
  41
  42   return stringify(u);
  43 }
  44
  45 static std::string map_option_ip_cb(const char *value_char)
  46 {
  47   entity_addr_t a;
  48   const char *endptr;
  49   if (!a.parse(value_char, &endptr) ||
  50       endptr != value_char + strlen(value_char)) {
  51     return "";
  52   }
  53
  54   return stringify(a.get_sockaddr());
  55 }
  56
  57 static std::string map_option_int_cb(const char *value_char)
  58 {
  59   std::string err;
  60   int d = strict_strtol(value_char, 10, &err);
  61   if (!err.empty() || d < 0)
  62     return "";
  63
  64   return stringify(d);
  65 }
  66
  67 static void put_map_option(const std::string &key, std::string val)
  68 {
  69   map_options[key] = val;
  70 }
  71
  72 static int put_map_option_value(const std::string &opt, const char *value_char,
  73                                 std::string (*parse_cb)(const char *))
  74 {
  75   if (!value_char || *value_char == '\0') {
  76     std::cerr << "rbd: " << opt << " option requires a value" << std::endl;
  77     return -EINVAL;
  78   }
  79
  80   std::string value = parse_cb(value_char);
  81   if (value.empty()) {
  82     std::cerr << "rbd: invalid " << opt << " value '" << value_char << "'"
  83               << std::endl;
  84     return -EINVAL;
  85   }
  86
  87   put_map_option(opt, opt + "=" + value);
  88   return 0;
  89 }
  90
  91 static int parse_map_options(char *options)
  92 {
  93   for (char *this_char = strtok(options, ", ");
  94        this_char != NULL;
  95        this_char = strtok(NULL, ",")) {
  96     char *value_char;
  97
  98     if ((value_char = strchr(this_char, '=')) != NULL)
  99       *value_char++ = '\0';
 100
 101     if (!strcmp(this_char, "fsid")) {
 102       if (put_map_option_value("fsid", value_char, map_option_uuid_cb))
 103         return -EINVAL;
 104     } else if (!strcmp(this_char, "ip")) {
 105       if (put_map_option_value("ip", value_char, map_option_ip_cb))
 106         return -EINVAL;
 107     } else if (!strcmp(this_char, "share") || !strcmp(this_char, "noshare")) {
 108       put_map_option("share", this_char);
 109     } else if (!strcmp(this_char, "crc") || !strcmp(this_char, "nocrc")) {
 110       put_map_option("crc", this_char);
 111     } else if (!strcmp(this_char, "cephx_require_signatures") ||
 112                !strcmp(this_char, "nocephx_require_signatures")) {
 113       put_map_option("cephx_require_signatures", this_char);
 114     } else if (!strcmp(this_char, "tcp_nodelay") ||
 115                !strcmp(this_char, "notcp_nodelay")) {
 116       put_map_option("tcp_nodelay", this_char);
 117     } else if (!strcmp(this_char, "cephx_sign_messages") ||
 118                !strcmp(this_char, "nocephx_sign_messages")) {
 119       put_map_option("cephx_sign_messages", this_char);
 120     } else if (!strcmp(this_char, "mount_timeout")) {
 121       if (put_map_option_value("mount_timeout", value_char, map_option_int_cb))
 122         return -EINVAL;
 123     } else if (!strcmp(this_char, "osdkeepalive")) {
 124       if (put_map_option_value("osdkeepalive", value_char, map_option_int_cb))
 125         return -EINVAL;
 126     } else if (!strcmp(this_char, "osd_idle_ttl")) {
 127       if (put_map_option_value("osd_idle_ttl", value_char, map_option_int_cb))
 128         return -EINVAL;
 129     } else if (!strcmp(this_char, "rw") || !strcmp(this_char, "ro")) {
 130       put_map_option("rw", this_char);
 131     } else if (!strcmp(this_char, "queue_depth")) {
 132       if (put_map_option_value("queue_depth", value_char, map_option_int_cb))
 133         return -EINVAL;
 134     } else if (!strcmp(this_char, "lock_on_read")) {
 135       put_map_option("lock_on_read", this_char);
 136     } else if (!strcmp(this_char, "exclusive")) {
 137       put_map_option("exclusive", this_char);
 138     } else {
 139       std::cerr << "rbd: unknown map option '" << this_char << "'" << std::endl;
 140       return -EINVAL;
 141     }
 142   }
 143
 144   return 0;
 145 }
 146
 147 static int parse_unmap_options(char *options)
 148 {
 149   for (char *this_char = strtok(options, ", ");
 150        this_char != NULL;
 151        this_char = strtok(NULL, ",")) {
 152     char *value_char;
 153
 154     if ((value_char = strchr(this_char, '=')) != NULL)
 155       *value_char++ = '\0';
 156
 157     if (!strcmp(this_char, "force")) {
 158       put_map_option("force", this_char);
 159     } else {
 160       std::cerr << "rbd: unknown unmap option '" << this_char << "'" << std::endl;
 161       return -EINVAL;
 162     }
 163   }
 164
 165   return 0;
 166 }
 167
 168 static int do_kernel_showmapped(Formatter *f)
 169 {
 170 #if defined(WITH_KRBD)
 171   struct krbd_ctx *krbd;
 172   int r;
 173
 174   r = krbd_create_from_context(g_ceph_context, &krbd);
 175   if (r < 0)
 176     return r;
 177
 178   r = krbd_showmapped(krbd, f);
 179
 180   krbd_destroy(krbd);
 181   return r;
 182 #else
 183   return -1;
 184 #endif
 185
 186 }
 187
 188 static int get_unsupported_features(librbd::Image &image,
 189                                     uint64_t *unsupported_features)
 190 {
 191   char buf[20];
 192   uint64_t features, supported_features;
 193   int r;
 194
 195   r = safe_read_file("/sys/bus/rbd/", "supported_features", buf,
 196                      sizeof(buf) - 1);
 197   if (r < 0)
 198     return r;
 199
 200   buf[r] = '\0';
 201   try {
 202     supported_features = std::stoull(buf, nullptr, 16);
 203   } catch (...) {
 204     return -EINVAL;
 205   }
 206
 207   r = image.features(&features);
 208   if (r < 0)
 209     return r;
 210
 211   *unsupported_features = features & ~supported_features;
 212   return 0;
 213 }
 214
 215 /*
 216  * hint user to check syslog for krbd related messages and provide suggestions
 217  * based on errno return by krbd_map(). also note that even if some librbd calls
 218  * fail, we at least dump the "try dmesg..." message to aid debugging.
 219  */
 220 static void print_error_description(const char *poolname, const char *imgname,
 221                                     const char *snapname, int maperrno)
 222 {
 223   int r;
 224   uint8_t oldformat;
 225   librados::Rados rados;
 226   librados::IoCtx ioctx;
 227   librbd::Image image;
 228
 229   if (maperrno == -ENOENT)
 230     goto done;
 231
 232   r = utils::init_and_open_image(poolname, imgname, "", snapname,
 233                                  true, &rados, &ioctx, &image);
 234   if (r < 0)
 235     goto done;
 236
 237   r = image.old_format(&oldformat);
 238   if (r < 0)
 239     goto done;
 240
 241   /*
 242    * kernel returns -ENXIO when mapping a V2 image due to unsupported feature
 243    * set - so, hint about that too...
 244    */
 245   if (!oldformat && (maperrno == -ENXIO)) {
 246     uint64_t unsupported_features;
 247     bool need_terminate = true;
 248
 249     std::cout << "RBD image feature set mismatch. ";
 250     r = get_unsupported_features(image, &unsupported_features);
 251     if (r == 0 && (unsupported_features & ~RBD_FEATURES_ALL) == 0) {
 252       uint64_t immutable = RBD_FEATURES_ALL & ~(RBD_FEATURES_MUTABLE |
 253                                                 RBD_FEATURES_DISABLE_ONLY);
 254       if (unsupported_features & immutable) {
 255         std::cout << "This image cannot be mapped because the following "
 256                   << "immutable features are unsupported by the kernel:";
 257         unsupported_features &= immutable;
 258         need_terminate = false;
 259       } else {
 260         std::cout << "You can disable features unsupported by the kernel "
 261                   << "with \"rbd feature disable ";
 262         if (poolname != at::DEFAULT_POOL_NAME)
 263           std::cout << poolname << "/";
 264         std::cout << imgname;
 265       }
 266     } else {
 267       std::cout << "Try disabling features unsupported by the kernel "
 268                 << "with \"rbd feature disable";
 269       unsupported_features = 0;
 270     }
 271     for (auto it : at::ImageFeatures::FEATURE_MAPPING) {
 272       if (it.first & unsupported_features) {
 273         std::cout << " " << it.second;
 274       }
 275     }
 276     if (need_terminate)
 277       std::cout << "\"";
 278     std::cout << "." << std::endl;
 279   }
 280
 281  done:
 282   std::cout << "In some cases useful info is found in syslog - try \"dmesg | tail\"." << std::endl;
 283 }
 284
 285 static int do_kernel_map(const char *poolname, const char *imgname,
 286                          const char *snapname)
 287 {
 288 #if defined(WITH_KRBD)
 289   struct krbd_ctx *krbd;
 290   std::ostringstream oss;
 291   char *devnode;
 292   int r;
 293
 294   r = krbd_create_from_context(g_ceph_context, &krbd);
 295   if (r < 0)
 296     return r;
 297
 298   for (std::map<std::string, std::string>::iterator it = map_options.begin();
 299        it != map_options.end(); ) {
 300     // for compatibility with < 3.7 kernels, assume that rw is on by
 301     // default and omit it even if it was specified by the user
 302     // (see ceph.git commit fb0f1986449b)
 303     if (it->first == "rw" && it->second == "rw") {
 304       map_options.erase(it);
 305     } else {
 306       if (it != map_options.begin())
 307         oss << ",";
 308       oss << it->second;
 309       ++it;
 310     }
 311   }
 312
 313   r = krbd_map(krbd, poolname, imgname, snapname, oss.str().c_str(), &devnode);
 314   if (r < 0) {
 315     print_error_description(poolname, imgname, snapname, r);
 316     goto out;
 317   }
 318
 319   std::cout << devnode << std::endl;
 320
 321   free(devnode);
 322 out:
 323   krbd_destroy(krbd);
 324   return r;
 325 #else
 326   return -1;
 327 #endif
 328 }
 329
 330 static int do_kernel_unmap(const char *dev, const char *poolname,
 331                            const char *imgname, const char *snapname)
 332 {
 333 #if defined(WITH_KRBD)
 334   struct krbd_ctx *krbd;
 335   std::ostringstream oss;
 336   int r;
 337
 338   r = krbd_create_from_context(g_ceph_context, &krbd);
 339   if (r < 0)
 340     return r;
 341
 342   for (auto it = map_options.cbegin(); it != map_options.cend(); ++it) {
 343     if (it != map_options.cbegin())
 344       oss << ",";
 345     oss << it->second;
 346   }
 347
 348   if (dev)
 349     r = krbd_unmap(krbd, dev, oss.str().c_str());
 350   else
 351     r = krbd_unmap_by_spec(krbd, poolname, imgname, snapname,
 352                            oss.str().c_str());
 353
 354   krbd_destroy(krbd);
 355   return r;
 356 #else
 357   return -1;
 358 #endif
 359
 360 }
 361
 362 void get_show_arguments(po::options_description *positional,
 363                         po::options_description *options) {
 364   at::add_format_options(options);
 365 }
 366
 367 int execute_show(const po::variables_map &vm) {
 368   at::Format::Formatter formatter;
 369   int r = utils::get_formatter(vm, &formatter);
 370   if (r < 0) {
 371     return r;
 372   }
 373
 374   utils::init_context();
 375
 376   r = do_kernel_showmapped(formatter.get());
 377   if (r < 0) {
 378     std::cerr << "rbd: showmapped failed: " << cpp_strerror(r) << std::endl;
 379     return r;
 380   }
 381   return 0;
 382 }
 383
 384 void get_map_arguments(po::options_description *positional,
 385                        po::options_description *options) {
 386   at::add_image_or_snap_spec_options(positional, options,
 387                                      at::ARGUMENT_MODIFIER_NONE);
 388   options->add_options()
 389     ("options,o", po::value<std::string>(), "map options")
 390     ("read-only", po::bool_switch(), "map read-only")
 391     ("exclusive", po::bool_switch(), "disable automatic exclusive lock transitions");
 392 }
 393
 394 int execute_map(const po::variables_map &vm) {
 395   size_t arg_index = 0;
 396   std::string pool_name;
 397   std::string image_name;
 398   std::string snap_name;
 399   int r = utils::get_pool_image_snapshot_names(
 400     vm, at::ARGUMENT_MODIFIER_NONE, &arg_index, &pool_name, &image_name,
 401     &snap_name, utils::SNAPSHOT_PRESENCE_PERMITTED,
 402     utils::SPEC_VALIDATION_NONE);
 403   if (r < 0) {
 404     return r;
 405   }
 406
 407   if (vm["read-only"].as<bool>()) {
 408     put_map_option("rw", "ro");
 409   }
 410   if (vm["exclusive"].as<bool>()) {
 411     put_map_option("exclusive", "exclusive");
 412   }
 413
 414   // parse default options first so they can be overwritten by cli options
 415   char *default_map_options = strdup(g_conf->rbd_default_map_options.c_str());
 416   BOOST_SCOPE_EXIT( (default_map_options) ) {
 417     free(default_map_options);
 418   } BOOST_SCOPE_EXIT_END;
 419
 420   if (parse_map_options(default_map_options)) {
 421     std::cerr << "rbd: couldn't parse default map options" << std::endl;
 422     return -EINVAL;
 423   }
 424
 425   if (vm.count("options")) {
 426     char *cli_map_options = strdup(vm["options"].as<std::string>().c_str());
 427     BOOST_SCOPE_EXIT( (cli_map_options) ) {
 428       free(cli_map_options);
 429     } BOOST_SCOPE_EXIT_END;
 430
 431     if (parse_map_options(cli_map_options)) {
 432       std::cerr << "rbd: couldn't parse map options" << std::endl;
 433       return -EINVAL;
 434     }
 435   }
 436
 437   utils::init_context();
 438
 439   r = do_kernel_map(pool_name.c_str(), image_name.c_str(), snap_name.c_str());
 440   if (r < 0) {
 441     std::cerr << "rbd: map failed: " << cpp_strerror(r) << std::endl;
 442     return r;
 443   }
 444
 445   return 0;
 446 }
 447
 448 void get_unmap_arguments(po::options_description *positional,
 449                    po::options_description *options) {
 450   positional->add_options()
 451     ("image-or-snap-or-device-spec",
 452      "image, snapshot, or device specification\n"
 453      "[<pool-name>/]<image-name>[@<snapshot-name>] or <device-path>");
 454   at::add_pool_option(options, at::ARGUMENT_MODIFIER_NONE);
 455   at::add_image_option(options, at::ARGUMENT_MODIFIER_NONE);
 456   at::add_snap_option(options, at::ARGUMENT_MODIFIER_NONE);
 457   options->add_options()
 458     ("options,o", po::value<std::string>(), "unmap options");
 459 }
 460
 461 int execute_unmap(const po::variables_map &vm) {
 462   std::string device_name = utils::get_positional_argument(vm, 0);
 463   if (!boost::starts_with(device_name, "/dev/")) {
 464     device_name.clear();
 465   }
 466
 467   size_t arg_index = 0;
 468   std::string pool_name;
 469   std::string image_name;
 470   std::string snap_name;
 471   int r;
 472   if (device_name.empty()) {
 473     r = utils::get_pool_image_snapshot_names(
 474       vm, at::ARGUMENT_MODIFIER_NONE, &arg_index, &pool_name, &image_name,
 475       &snap_name, utils::SNAPSHOT_PRESENCE_PERMITTED,
 476       utils::SPEC_VALIDATION_NONE, false);
 477     if (r < 0) {
 478       return r;
 479     }
 480   }
 481
 482   if (device_name.empty() && image_name.empty()) {
 483     std::cerr << "rbd: unmap requires either image name or device path"
 484               << std::endl;
 485     return -EINVAL;
 486   }
 487
 488   if (vm.count("options")) {
 489     char *cli_unmap_options = strdup(vm["options"].as<std::string>().c_str());
 490     BOOST_SCOPE_EXIT( (cli_unmap_options) ) {
 491       free(cli_unmap_options);
 492     } BOOST_SCOPE_EXIT_END;
 493
 494     if (parse_unmap_options(cli_unmap_options)) {
 495       std::cerr << "rbd: couldn't parse unmap options" << std::endl;
 496       return -EINVAL;
 497     }
 498   }
 499
 500   utils::init_context();
 501
 502   r = do_kernel_unmap(device_name.empty() ? nullptr : device_name.c_str(),
 503                       pool_name.c_str(), image_name.c_str(),
 504                       snap_name.empty() ? nullptr : snap_name.c_str());
 505   if (r < 0) {
 506     std::cerr << "rbd: unmap failed: " << cpp_strerror(r) << std::endl;
 507     return r;
 508   }
 509   return 0;
 510 }
 511
 512 Shell::SwitchArguments switched_arguments({"read-only", "exclusive"});
 513 Shell::Action action_show(
 514   {"showmapped"}, {}, "Show the rbd images mapped by the kernel.", "",
 515   &get_show_arguments, &execute_show);
 516
 517 Shell::Action action_map(
 518   {"map"}, {}, "Map image to a block device using the kernel.", "",
 519   &get_map_arguments, &execute_map);
 520
 521 Shell::Action action_unmap(
 522   {"unmap"}, {}, "Unmap a rbd device that was used by the kernel.", "",
 523   &get_unmap_arguments, &execute_unmap);
 524
 525 } // namespace kernel
 526 } // namespace action
 527 } // namespace rbd