git.ozlabs.org Git - petitboot/blob - discover/device-handler.c

   1 #include <assert.h>
   2 #include <stdlib.h>
   3 #include <stdbool.h>
   4 #include <unistd.h>
   5 #include <string.h>
   6 #include <errno.h>
   7 #include <mntent.h>
   8 #include <locale.h>
   9 #include <sys/stat.h>
  10 #include <sys/wait.h>
  11 #include <sys/mount.h>
  12
  13 #include <talloc/talloc.h>
  14 #include <list/list.h>
  15 #include <log/log.h>
  16 #include <types/types.h>
  17 #include <system/system.h>
  18 #include <process/process.h>
  19 #include <url/url.h>
  20 #include <i18n/i18n.h>
  21
  22 #include <sys/types.h>
  23 #include <sys/socket.h>
  24 #include <netdb.h>
  25 #include <arpa/inet.h>
  26
  27 #include "device-handler.h"
  28 #include "discover-server.h"
  29 #include "devmapper.h"
  30 #include "user-event.h"
  31 #include "platform.h"
  32 #include "event.h"
  33 #include "parser.h"
  34 #include "resource.h"
  35 #include "paths.h"
  36 #include "sysinfo.h"
  37 #include "boot.h"
  38 #include "udev.h"
  39 #include "network.h"
  40 #include "ipmi.h"
  41
  42 enum default_priority {
  43         DEFAULT_PRIORITY_REMOTE         = 1,
  44         DEFAULT_PRIORITY_LOCAL_FIRST    = 2,
  45         DEFAULT_PRIORITY_LOCAL_LAST     = 0xfe,
  46         DEFAULT_PRIORITY_DISABLED       = 0xff,
  47 };
  48
  49 struct device_handler {
  50         struct discover_server  *server;
  51         int                     dry_run;
  52
  53         struct pb_udev          *udev;
  54         struct network          *network;
  55         struct user_event       *user_event;
  56
  57         struct discover_device  **devices;
  58         unsigned int            n_devices;
  59
  60         struct ramdisk_device   **ramdisks;
  61         unsigned int            n_ramdisks;
  62
  63         struct waitset          *waitset;
  64         struct waiter           *timeout_waiter;
  65         bool                    autoboot_enabled;
  66         unsigned int            sec_to_boot;
  67
  68         struct discover_boot_option *default_boot_option;
  69         int                     default_boot_option_priority;
  70
  71         struct list             unresolved_boot_options;
  72
  73         struct boot_task        *pending_boot;
  74         bool                    pending_boot_is_default;
  75 };
  76
  77 static int mount_device(struct discover_device *dev);
  78 static int umount_device(struct discover_device *dev);
  79
  80 static int device_handler_init_sources(struct device_handler *handler);
  81 static void device_handler_reinit_sources(struct device_handler *handler);
  82
  83 static void device_handler_update_lang(const char *lang);
  84
  85 void discover_context_add_boot_option(struct discover_context *ctx,
  86                 struct discover_boot_option *boot_option)
  87 {
  88         boot_option->source = ctx->parser;
  89         list_add_tail(&ctx->boot_options, &boot_option->list);
  90         talloc_steal(ctx, boot_option);
  91 }
  92
  93 /**
  94  * device_handler_get_device_count - Get the count of current handler devices.
  95  */
  96
  97 int device_handler_get_device_count(const struct device_handler *handler)
  98 {
  99         return handler->n_devices;
 100 }
 101
 102 /**
 103  * device_handler_get_device - Get a handler device by index.
 104  */
 105
 106 const struct discover_device *device_handler_get_device(
 107         const struct device_handler *handler, unsigned int index)
 108 {
 109         if (index >= handler->n_devices) {
 110                 assert(0 && "bad index");
 111                 return NULL;
 112         }
 113
 114         return handler->devices[index];
 115 }
 116
 117 struct discover_boot_option *discover_boot_option_create(
 118                 struct discover_context *ctx,
 119                 struct discover_device *device)
 120 {
 121         struct discover_boot_option *opt;
 122
 123         opt = talloc_zero(ctx, struct discover_boot_option);
 124         opt->option = talloc_zero(opt, struct boot_option);
 125         opt->device = device;
 126
 127         return opt;
 128 }
 129
 130 static int device_match_uuid(struct discover_device *dev, const char *uuid)
 131 {
 132         return dev->uuid && !strcmp(dev->uuid, uuid);
 133 }
 134
 135 static int device_match_label(struct discover_device *dev, const char *label)
 136 {
 137         return dev->label && !strcmp(dev->label, label);
 138 }
 139
 140 static int device_match_id(struct discover_device *dev, const char *id)
 141 {
 142         return !strcmp(dev->device->id, id);
 143 }
 144
 145 static int device_match_serial(struct discover_device *dev, const char *serial)
 146 {
 147         const char *val = discover_device_get_param(dev, "ID_SERIAL");
 148         return val && !strcmp(val, serial);
 149 }
 150
 151 static struct discover_device *device_lookup(
 152                 struct device_handler *device_handler,
 153                 int (match_fn)(struct discover_device *, const char *),
 154                 const char *str)
 155 {
 156         struct discover_device *dev;
 157         unsigned int i;
 158
 159         if (!str)
 160                 return NULL;
 161
 162         for (i = 0; i < device_handler->n_devices; i++) {
 163                 dev = device_handler->devices[i];
 164
 165                 if (match_fn(dev, str))
 166                         return dev;
 167         }
 168
 169         return NULL;
 170 }
 171
 172 struct discover_device *device_lookup_by_name(struct device_handler *handler,
 173                 const char *name)
 174 {
 175         if (!strncmp(name, "/dev/", strlen("/dev/")))
 176                 name += strlen("/dev/");
 177
 178         return device_lookup_by_id(handler, name);
 179 }
 180
 181 struct discover_device *device_lookup_by_uuid(
 182                 struct device_handler *device_handler,
 183                 const char *uuid)
 184 {
 185         return device_lookup(device_handler, device_match_uuid, uuid);
 186 }
 187
 188 struct discover_device *device_lookup_by_label(
 189                 struct device_handler *device_handler,
 190                 const char *label)
 191 {
 192         return device_lookup(device_handler, device_match_label, label);
 193 }
 194
 195 struct discover_device *device_lookup_by_id(
 196                 struct device_handler *device_handler,
 197                 const char *id)
 198 {
 199         return device_lookup(device_handler, device_match_id, id);
 200 }
 201
 202 struct discover_device *device_lookup_by_serial(
 203                 struct device_handler *device_handler,
 204                 const char *serial)
 205 {
 206         return device_lookup(device_handler, device_match_serial, serial);
 207 }
 208
 209 void device_handler_destroy(struct device_handler *handler)
 210 {
 211         talloc_free(handler);
 212 }
 213
 214 static int destroy_device(void *arg)
 215 {
 216         struct discover_device *dev = arg;
 217
 218         umount_device(dev);
 219
 220         return 0;
 221 }
 222
 223 struct discover_device *discover_device_create(struct device_handler *handler,
 224                 const char *id)
 225 {
 226         struct discover_device *dev;
 227
 228         dev = device_lookup_by_id(handler, id);
 229         if (dev)
 230                 return dev;
 231
 232         dev = talloc_zero(handler, struct discover_device);
 233         dev->device = talloc_zero(dev, struct device);
 234         dev->device->id = talloc_strdup(dev->device, id);
 235         list_init(&dev->params);
 236         list_init(&dev->boot_options);
 237
 238         talloc_set_destructor(dev, destroy_device);
 239
 240         return dev;
 241 }
 242
 243 struct discover_device_param {
 244         char                    *name;
 245         char                    *value;
 246         struct list_item        list;
 247 };
 248
 249 void discover_device_set_param(struct discover_device *device,
 250                 const char *name, const char *value)
 251 {
 252         struct discover_device_param *param;
 253         bool found = false;
 254
 255         list_for_each_entry(&device->params, param, list) {
 256                 if (!strcmp(param->name, name)) {
 257                         found = true;
 258                         break;
 259                 }
 260         }
 261
 262         if (!found) {
 263                 if (!value)
 264                         return;
 265                 param = talloc(device, struct discover_device_param);
 266                 param->name = talloc_strdup(param, name);
 267                 list_add(&device->params, &param->list);
 268         } else {
 269                 if (!value) {
 270                         list_remove(&param->list);
 271                         talloc_free(param);
 272                         return;
 273                 }
 274                 talloc_free(param->value);
 275         }
 276
 277         param->value = talloc_strdup(param, value);
 278 }
 279
 280 const char *discover_device_get_param(struct discover_device *device,
 281                 const char *name)
 282 {
 283         struct discover_device_param *param;
 284
 285         list_for_each_entry(&device->params, param, list) {
 286                 if (!strcmp(param->name, name))
 287                         return param->value;
 288         }
 289         return NULL;
 290 }
 291
 292 struct device_handler *device_handler_init(struct discover_server *server,
 293                 struct waitset *waitset, int dry_run)
 294 {
 295         struct device_handler *handler;
 296         int rc;
 297
 298         handler = talloc_zero(NULL, struct device_handler);
 299         handler->server = server;
 300         handler->waitset = waitset;
 301         handler->dry_run = dry_run;
 302         handler->autoboot_enabled = config_get()->autoboot_enabled;
 303
 304         list_init(&handler->unresolved_boot_options);
 305
 306         /* set up our mount point base */
 307         pb_mkdir_recursive(mount_base());
 308
 309         parser_init();
 310
 311         if (config_get()->safe_mode)
 312                 return handler;
 313
 314         rc = device_handler_init_sources(handler);
 315         if (rc) {
 316                 talloc_free(handler);
 317                 return NULL;
 318         }
 319
 320         return handler;
 321 }
 322
 323 void device_handler_reinit(struct device_handler *handler)
 324 {
 325         struct discover_boot_option *opt, *tmp;
 326         struct ramdisk_device *ramdisk;
 327         unsigned int i;
 328
 329         device_handler_cancel_default(handler);
 330
 331         /* free unresolved boot options */
 332         list_for_each_entry_safe(&handler->unresolved_boot_options,
 333                         opt, tmp, list)
 334                 talloc_free(opt);
 335         list_init(&handler->unresolved_boot_options);
 336
 337         /* drop all devices */
 338         for (i = 0; i < handler->n_devices; i++) {
 339                 discover_server_notify_device_remove(handler->server,
 340                                 handler->devices[i]->device);
 341                 ramdisk = handler->devices[i]->ramdisk;
 342                 talloc_free(handler->devices[i]);
 343                 talloc_free(ramdisk);
 344         }
 345
 346         talloc_free(handler->devices);
 347         handler->devices = NULL;
 348         handler->n_devices = 0;
 349         talloc_free(handler->ramdisks);
 350         handler->ramdisks = NULL;
 351         handler->n_ramdisks = 0;
 352
 353         device_handler_reinit_sources(handler);
 354 }
 355
 356 void device_handler_remove(struct device_handler *handler,
 357                 struct discover_device *device)
 358 {
 359         struct discover_boot_option *opt, *tmp;
 360         unsigned int i;
 361
 362         for (i = 0; i < handler->n_devices; i++)
 363                 if (handler->devices[i] == device)
 364                         break;
 365
 366         if (i == handler->n_devices) {
 367                 talloc_free(device);
 368                 return;
 369         }
 370
 371         /* Free any unresolved options, as they're currently allocated
 372          * against the handler */
 373         list_for_each_entry_safe(&handler->unresolved_boot_options,
 374                         opt, tmp, list) {
 375                 if (opt->device != device)
 376                         continue;
 377                 list_remove(&opt->list);
 378                 talloc_free(opt);
 379         }
 380
 381         /* if this is a network device, we have to unregister it from the
 382          * network code */
 383         if (device->device->type == DEVICE_TYPE_NETWORK)
 384                 network_unregister_device(handler->network, device);
 385
 386         handler->n_devices--;
 387         memmove(&handler->devices[i], &handler->devices[i + 1],
 388                 (handler->n_devices - i) * sizeof(handler->devices[0]));
 389         handler->devices = talloc_realloc(handler, handler->devices,
 390                 struct discover_device *, handler->n_devices);
 391
 392         if (device->notified)
 393                 discover_server_notify_device_remove(handler->server,
 394                                                         device->device);
 395
 396         talloc_free(device);
 397 }
 398
 399 static void boot_status(void *arg, struct boot_status *status)
 400 {
 401         struct device_handler *handler = arg;
 402
 403         discover_server_notify_boot_status(handler->server, status);
 404 }
 405
 406 static void countdown_status(struct device_handler *handler,
 407                 struct discover_boot_option *opt, unsigned int sec)
 408 {
 409         struct boot_status status;
 410
 411         status.type = BOOT_STATUS_INFO;
 412         status.progress = -1;
 413         status.detail = NULL;
 414         status.message = talloc_asprintf(handler,
 415                         _("Booting in %d sec: %s"), sec, opt->option->name);
 416
 417         discover_server_notify_boot_status(handler->server, &status);
 418
 419         talloc_free(status.message);
 420 }
 421
 422 static int default_timeout(void *arg)
 423 {
 424         struct device_handler *handler = arg;
 425         struct discover_boot_option *opt;
 426
 427         if (!handler->default_boot_option)
 428                 return 0;
 429
 430         if (handler->pending_boot)
 431                 return 0;
 432
 433         opt = handler->default_boot_option;
 434
 435         if (handler->sec_to_boot) {
 436                 countdown_status(handler, opt, handler->sec_to_boot);
 437                 handler->sec_to_boot--;
 438                 handler->timeout_waiter = waiter_register_timeout(
 439                                                 handler->waitset, 1000,
 440                                                 default_timeout, handler);
 441                 return 0;
 442         }
 443
 444         handler->timeout_waiter = NULL;
 445
 446         pb_log("Timeout expired, booting default option %s\n", opt->option->id);
 447
 448         handler->pending_boot = boot(handler, handler->default_boot_option,
 449                         NULL, handler->dry_run, boot_status, handler);
 450         handler->pending_boot_is_default = true;
 451         return 0;
 452 }
 453
 454 struct {
 455         enum ipmi_bootdev       ipmi_type;
 456         enum device_type        device_type;
 457 } device_type_map[] = {
 458         { IPMI_BOOTDEV_NETWORK, DEVICE_TYPE_NETWORK },
 459         { IPMI_BOOTDEV_DISK, DEVICE_TYPE_DISK },
 460         { IPMI_BOOTDEV_DISK, DEVICE_TYPE_USB },
 461         { IPMI_BOOTDEV_CDROM, DEVICE_TYPE_OPTICAL },
 462 };
 463
 464 static bool ipmi_device_type_matches(enum ipmi_bootdev ipmi_type,
 465                 enum device_type device_type)
 466 {
 467         unsigned int i;
 468
 469         for (i = 0; i < ARRAY_SIZE(device_type_map); i++) {
 470                 if (device_type_map[i].device_type == device_type)
 471                         return device_type_map[i].ipmi_type == ipmi_type;
 472         }
 473
 474         return false;
 475 }
 476
 477 static int autoboot_option_priority(const struct config *config,
 478                                 struct discover_boot_option *opt)
 479 {
 480         enum device_type type = opt->device->device->type;
 481         const char *uuid = opt->device->uuid;
 482         struct autoboot_option *auto_opt;
 483         unsigned int i;
 484
 485         for (i = 0; i < config->n_autoboot_opts; i++) {
 486                 auto_opt = &config->autoboot_opts[i];
 487                 if (auto_opt->boot_type == BOOT_DEVICE_UUID)
 488                         if (!strcmp(auto_opt->uuid, uuid))
 489                                 return DEFAULT_PRIORITY_LOCAL_FIRST + i;
 490
 491                 if (auto_opt->boot_type == BOOT_DEVICE_TYPE)
 492                         if (auto_opt->type == type ||
 493                             auto_opt->type == DEVICE_TYPE_ANY)
 494                                 return DEFAULT_PRIORITY_LOCAL_FIRST + i;
 495         }
 496
 497         return -1;
 498 }
 499
 500 /*
 501  * We have different priorities to resolve conflicts between boot options that
 502  * report to be the default for their device. This function assigns a priority
 503  * for these options.
 504  */
 505 static enum default_priority default_option_priority(
 506                 struct discover_boot_option *opt)
 507 {
 508         const struct config *config;
 509
 510         config = config_get();
 511
 512         /* We give highest priority to IPMI-configured boot options. If
 513          * we have an IPMI bootdev configuration set, then we don't allow
 514          * any other defaults */
 515         if (config->ipmi_bootdev) {
 516                 bool ipmi_match = ipmi_device_type_matches(config->ipmi_bootdev,
 517                                 opt->device->device->type);
 518                 if (ipmi_match)
 519                         return DEFAULT_PRIORITY_REMOTE;
 520
 521                 pb_debug("handler: disabled default priority due to "
 522                                 "non-matching IPMI type %x\n",
 523                                 config->ipmi_bootdev);
 524                 return DEFAULT_PRIORITY_DISABLED;
 525         }
 526
 527         /* Next, try to match the option against the user-defined autoboot
 528          * options, either by device UUID or type. */
 529         if (config->n_autoboot_opts) {
 530                 int boot_match = autoboot_option_priority(config, opt);
 531                 if (boot_match > 0)
 532                         return boot_match;
 533         }
 534
 535         /* If the option didn't match any entry in the array, it is disabled */
 536         pb_debug("handler: disabled default priority due to "
 537                         "non-matching UUID or type\n");
 538         return DEFAULT_PRIORITY_DISABLED;
 539 }
 540
 541 static void set_default(struct device_handler *handler,
 542                 struct discover_boot_option *opt)
 543 {
 544         enum default_priority cur_prio, new_prio;
 545
 546         if (!handler->autoboot_enabled)
 547                 return;
 548
 549         pb_debug("handler: new default option: %s\n", opt->option->id);
 550
 551         new_prio = default_option_priority(opt);
 552
 553         /* Anything outside our range prevents a default boot */
 554         if (new_prio >= DEFAULT_PRIORITY_DISABLED)
 555                 return;
 556
 557         pb_debug("handler: calculated priority %d\n", new_prio);
 558
 559         /* Resolve any conflicts: if we have a new default option, it only
 560          * replaces the current if it has a higher priority. */
 561         if (handler->default_boot_option) {
 562
 563                 cur_prio = handler->default_boot_option_priority;
 564
 565                 if (new_prio < cur_prio) {
 566                         pb_log("handler: new prio %d beats "
 567                                         "old prio %d for %s\n",
 568                                         new_prio, cur_prio,
 569                                         handler->default_boot_option
 570                                                 ->option->id);
 571                         handler->default_boot_option = opt;
 572                         handler->default_boot_option_priority = new_prio;
 573                         /* extend the timeout a little, so the user sees some
 574                          * indication of the change */
 575                         handler->sec_to_boot += 2;
 576                 }
 577
 578                 return;
 579         }
 580
 581         handler->sec_to_boot = config_get()->autoboot_timeout_sec;
 582         handler->default_boot_option = opt;
 583         handler->default_boot_option_priority = new_prio;
 584
 585         pb_log("handler: boot option %s set as default, timeout %u sec.\n",
 586                opt->option->id, handler->sec_to_boot);
 587
 588         default_timeout(handler);
 589 }
 590
 591 static bool resource_is_resolved(struct resource *res)
 592 {
 593         return !res || res->resolved;
 594 }
 595
 596 /* We only use this in an assert, which will disappear if we're compiling
 597  * with NDEBUG, so we need the 'used' attribute for these builds */
 598 static bool __attribute__((used)) boot_option_is_resolved(
 599                 struct discover_boot_option *opt)
 600 {
 601         return resource_is_resolved(opt->boot_image) &&
 602                 resource_is_resolved(opt->initrd) &&
 603                 resource_is_resolved(opt->dtb) &&
 604                 resource_is_resolved(opt->icon);
 605 }
 606
 607 static bool resource_resolve(struct resource *res, const char *name,
 608                 struct discover_boot_option *opt,
 609                 struct device_handler *handler)
 610 {
 611         struct parser *parser = opt->source;
 612
 613         if (resource_is_resolved(res))
 614                 return true;
 615
 616         pb_debug("Attempting to resolve resource %s->%s with parser %s\n",
 617                         opt->option->id, name, parser->name);
 618         parser->resolve_resource(handler, res);
 619
 620         return res->resolved;
 621 }
 622
 623 static bool boot_option_resolve(struct discover_boot_option *opt,
 624                 struct device_handler *handler)
 625 {
 626         return resource_resolve(opt->boot_image, "boot_image", opt, handler) &&
 627                 resource_resolve(opt->initrd, "initrd", opt, handler) &&
 628                 resource_resolve(opt->dtb, "dtb", opt, handler) &&
 629                 resource_resolve(opt->icon, "icon", opt, handler);
 630 }
 631
 632 static void boot_option_finalise(struct device_handler *handler,
 633                 struct discover_boot_option *opt)
 634 {
 635         assert(boot_option_is_resolved(opt));
 636
 637         /* check that the parsers haven't set any of the final data */
 638         assert(!opt->option->boot_image_file);
 639         assert(!opt->option->initrd_file);
 640         assert(!opt->option->dtb_file);
 641         assert(!opt->option->icon_file);
 642         assert(!opt->option->device_id);
 643
 644         if (opt->boot_image)
 645                 opt->option->boot_image_file = opt->boot_image->url->full;
 646         if (opt->initrd)
 647                 opt->option->initrd_file = opt->initrd->url->full;
 648         if (opt->dtb)
 649                 opt->option->dtb_file = opt->dtb->url->full;
 650         if (opt->icon)
 651                 opt->option->icon_file = opt->icon->url->full;
 652
 653         opt->option->device_id = opt->device->device->id;
 654
 655         if (opt->option->is_default)
 656                 set_default(handler, opt);
 657 }
 658
 659 static void notify_boot_option(struct device_handler *handler,
 660                 struct discover_boot_option *opt)
 661 {
 662         struct discover_device *dev = opt->device;
 663
 664         if (!dev->notified)
 665                 discover_server_notify_device_add(handler->server,
 666                                                   opt->device->device);
 667         dev->notified = true;
 668         discover_server_notify_boot_option_add(handler->server, opt->option);
 669 }
 670
 671 static void process_boot_option_queue(struct device_handler *handler)
 672 {
 673         struct discover_boot_option *opt, *tmp;
 674
 675         list_for_each_entry_safe(&handler->unresolved_boot_options,
 676                         opt, tmp, list) {
 677
 678                 pb_debug("queue: attempting resolution for %s\n",
 679                                 opt->option->id);
 680
 681                 if (!boot_option_resolve(opt, handler))
 682                         continue;
 683
 684                 pb_debug("\tresolved!\n");
 685
 686                 list_remove(&opt->list);
 687                 list_add_tail(&opt->device->boot_options, &opt->list);
 688                 talloc_steal(opt->device, opt);
 689                 boot_option_finalise(handler, opt);
 690                 notify_boot_option(handler, opt);
 691         }
 692 }
 693
 694 struct discover_context *device_handler_discover_context_create(
 695                 struct device_handler *handler,
 696                 struct discover_device *device)
 697 {
 698         struct discover_context *ctx;
 699
 700         ctx = talloc_zero(handler, struct discover_context);
 701         ctx->device = device;
 702         ctx->network = handler->network;
 703         list_init(&ctx->boot_options);
 704
 705         return ctx;
 706 }
 707
 708 /**
 709  * context_commit - Commit a temporary discovery context to the handler,
 710  * and notify the clients about any new options / devices
 711  */
 712 void device_handler_discover_context_commit(struct device_handler *handler,
 713                 struct discover_context *ctx)
 714 {
 715         struct discover_device *dev = ctx->device;
 716         struct discover_boot_option *opt, *tmp;
 717
 718         if (!device_lookup_by_id(handler, dev->device->id))
 719                 device_handler_add_device(handler, dev);
 720
 721         /* move boot options from the context to the device */
 722         list_for_each_entry_safe(&ctx->boot_options, opt, tmp, list) {
 723                 list_remove(&opt->list);
 724
 725                 if (boot_option_resolve(opt, handler)) {
 726                         pb_log("boot option %s is resolved, "
 727                                         "sending to clients\n",
 728                                         opt->option->id);
 729                         list_add_tail(&dev->boot_options, &opt->list);
 730                         talloc_steal(dev, opt);
 731                         boot_option_finalise(handler, opt);
 732                         notify_boot_option(handler, opt);
 733                 } else {
 734                         if (!opt->source->resolve_resource) {
 735                                 pb_log("parser %s gave us an unresolved "
 736                                         "resource (%s), but no way to "
 737                                         "resolve it\n",
 738                                         opt->source->name, opt->option->id);
 739                                 talloc_free(opt);
 740                         } else {
 741                                 pb_log("boot option %s is unresolved, "
 742                                                 "adding to queue\n",
 743                                                 opt->option->id);
 744                                 list_add(&handler->unresolved_boot_options,
 745                                                 &opt->list);
 746                                 talloc_steal(handler, opt);
 747                         }
 748                 }
 749         }
 750 }
 751
 752 void device_handler_add_device(struct device_handler *handler,
 753                 struct discover_device *device)
 754 {
 755         handler->n_devices++;
 756         handler->devices = talloc_realloc(handler, handler->devices,
 757                                 struct discover_device *, handler->n_devices);
 758         handler->devices[handler->n_devices - 1] = device;
 759
 760         if (device->device->type == DEVICE_TYPE_NETWORK)
 761                 network_register_device(handler->network, device);
 762 }
 763
 764 void device_handler_add_ramdisk(struct device_handler *handler,
 765                 const char *path)
 766 {
 767         struct ramdisk_device *dev;
 768         unsigned int i;
 769
 770         if (!path)
 771                 return;
 772
 773         for (i = 0; i < handler->n_ramdisks; i++)
 774                 if (!strcmp(handler->ramdisks[i]->path, path))
 775                         return;
 776
 777         dev = talloc_zero(handler, struct ramdisk_device);
 778         if (!dev) {
 779                 pb_log("Failed to allocate memory to track %s\n", path);
 780                 return;
 781         }
 782
 783         dev->path = talloc_strdup(handler, path);
 784
 785         handler->ramdisks = talloc_realloc(handler, handler->ramdisks,
 786                                 struct ramdisk_device *,
 787                                 handler->n_ramdisks + 1);
 788         if (!handler->ramdisks) {
 789                 pb_log("Failed to reallocate memory"
 790                        "- ramdisk tracking inconsistent!\n");
 791                 return;
 792         }
 793
 794         handler->ramdisks[i] = dev;
 795         i = handler->n_ramdisks++;
 796 }
 797
 798 struct ramdisk_device *device_handler_get_ramdisk(
 799                 struct device_handler *handler)
 800 {
 801         unsigned int i;
 802         char *name;
 803         dev_t id;
 804
 805         /* Check if free ramdisk exists */
 806         for (i = 0; i < handler->n_ramdisks; i++)
 807                 if (!handler->ramdisks[i]->snapshot &&
 808                     !handler->ramdisks[i]->origin &&
 809                     !handler->ramdisks[i]->base)
 810                         return handler->ramdisks[i];
 811
 812         /* Otherwise create a new one */
 813         name = talloc_asprintf(handler, "/dev/ram%d",
 814                         handler->n_ramdisks);
 815         if (!name) {
 816                 pb_debug("Failed to allocate memory to name /dev/ram%d",
 817                         handler->n_ramdisks);
 818                 return NULL;
 819         }
 820
 821         id = makedev(1, handler->n_ramdisks);
 822         if (mknod(name, S_IFBLK, id)) {
 823                 if (errno == EEXIST) {
 824                         /* We haven't yet received updates for existing
 825                          * ramdisks - add and use this one */
 826                         pb_debug("Using untracked ramdisk %s\n", name);
 827                 } else {
 828                         pb_log("Failed to create new ramdisk %s: %s\n",
 829                                name, strerror(errno));
 830                         return NULL;
 831                 }
 832         }
 833         device_handler_add_ramdisk(handler, name);
 834         talloc_free(name);
 835
 836         return handler->ramdisks[i];
 837 }
 838
 839 void device_handler_release_ramdisk(struct discover_device *device)
 840 {
 841         struct ramdisk_device *ramdisk = device->ramdisk;
 842
 843         talloc_free(ramdisk->snapshot);
 844         talloc_free(ramdisk->origin);
 845         talloc_free(ramdisk->base);
 846
 847         ramdisk->snapshot = ramdisk->origin = ramdisk->base = NULL;
 848         ramdisk->sectors = 0;
 849
 850         device->ramdisk = NULL;
 851 }
 852
 853 /* Start discovery on a hotplugged device. The device will be in our devices
 854  * array, but has only just been initialised by the hotplug source.
 855  */
 856 int device_handler_discover(struct device_handler *handler,
 857                 struct discover_device *dev)
 858 {
 859         struct discover_context *ctx;
 860         struct boot_status *status;
 861         int rc;
 862
 863         status = talloc_zero(handler, struct boot_status);
 864         status->type = BOOT_STATUS_INFO;
 865         status->message = talloc_asprintf(status, _("Processing %s device %s"),
 866                                 device_type_display_name(dev->device->type),
 867                                 dev->device->id);
 868         boot_status(handler, status);
 869
 870         process_boot_option_queue(handler);
 871
 872         /* create our context */
 873         ctx = device_handler_discover_context_create(handler, dev);
 874
 875         rc = mount_device(dev);
 876         if (rc)
 877                 goto out;
 878
 879         /* add this device to our system info */
 880         system_info_register_blockdev(dev->device->id, dev->uuid,
 881                         dev->mount_path);
 882
 883         /* run the parsers. This will populate the ctx's boot_option list. */
 884         iterate_parsers(ctx);
 885
 886         /* add discovered stuff to the handler */
 887         device_handler_discover_context_commit(handler, ctx);
 888
 889 out:
 890         status->message = talloc_asprintf(status,_("Processing %s complete\n"),
 891                                 dev->device->id);
 892         boot_status(handler, status);
 893
 894         talloc_free(status);
 895         talloc_free(ctx);
 896
 897         return 0;
 898 }
 899
 900 /* Incoming dhcp event */
 901 int device_handler_dhcp(struct device_handler *handler,
 902                 struct discover_device *dev, struct event *event)
 903 {
 904         struct discover_context *ctx;
 905         struct boot_status *status;
 906
 907         status = talloc_zero(handler, struct boot_status);
 908         status->type = BOOT_STATUS_INFO;
 909         status->message = talloc_asprintf(status, _("Processing dhcp event on %s"),
 910                                 dev->device->id);
 911         boot_status(handler, status);
 912
 913         /* create our context */
 914         ctx = device_handler_discover_context_create(handler, dev);
 915         ctx->event = event;
 916
 917         iterate_parsers(ctx);
 918
 919         device_handler_discover_context_commit(handler, ctx);
 920
 921         status->message = talloc_asprintf(status,_("Processing %s complete\n"),
 922                                 dev->device->id);
 923         boot_status(handler, status);
 924
 925         talloc_free(status);
 926         talloc_free(ctx);
 927
 928         return 0;
 929 }
 930
 931 /* incoming conf event */
 932 int device_handler_conf(struct device_handler *handler,
 933                 struct discover_device *dev, struct pb_url *url)
 934 {
 935         struct discover_context *ctx;
 936         struct boot_status *status;
 937
 938         status = talloc_zero(handler, struct boot_status);
 939         status->type = BOOT_STATUS_INFO;
 940         status->message = talloc_asprintf(status, _("Processing user config"));
 941         boot_status(handler, status);
 942
 943         /* create our context */
 944         ctx = device_handler_discover_context_create(handler, dev);
 945         ctx->conf_url = url;
 946
 947         iterate_parsers(ctx);
 948
 949         device_handler_discover_context_commit(handler, ctx);
 950
 951         status->message = talloc_asprintf(status,
 952                                 _("Processing user config complete"));
 953         boot_status(handler, status);
 954
 955         talloc_free(status);
 956         talloc_free(ctx);
 957
 958         return 0;
 959 }
 960
 961 static struct discover_boot_option *find_boot_option_by_id(
 962                 struct device_handler *handler, const char *id)
 963 {
 964         unsigned int i;
 965
 966         for (i = 0; i < handler->n_devices; i++) {
 967                 struct discover_device *dev = handler->devices[i];
 968                 struct discover_boot_option *opt;
 969
 970                 list_for_each_entry(&dev->boot_options, opt, list)
 971                         if (!strcmp(opt->option->id, id))
 972                                 return opt;
 973         }
 974
 975         return NULL;
 976 }
 977
 978 void device_handler_boot(struct device_handler *handler,
 979                 struct boot_command *cmd)
 980 {
 981         struct discover_boot_option *opt = NULL;
 982
 983         if (cmd->option_id && strlen(cmd->option_id))
 984                 opt = find_boot_option_by_id(handler, cmd->option_id);
 985
 986         if (handler->pending_boot)
 987                 boot_cancel(handler->pending_boot);
 988
 989         platform_pre_boot();
 990
 991         handler->pending_boot = boot(handler, opt, cmd, handler->dry_run,
 992                         boot_status, handler);
 993         handler->pending_boot_is_default = false;
 994 }
 995
 996 void device_handler_cancel_default(struct device_handler *handler)
 997 {
 998         struct boot_status status;
 999
1000         if (handler->timeout_waiter)
1001                 waiter_remove(handler->timeout_waiter);
1002
1003         handler->timeout_waiter = NULL;
1004         handler->autoboot_enabled = false;
1005
1006         /* we only send status if we had a default boot option queued */
1007         if (!handler->default_boot_option)
1008                 return;
1009
1010         pb_log("Cancelling default boot option\n");
1011
1012         if (handler->pending_boot && handler->pending_boot_is_default) {
1013                 boot_cancel(handler->pending_boot);
1014                 handler->pending_boot = NULL;
1015                 handler->pending_boot_is_default = false;
1016         }
1017
1018         handler->default_boot_option = NULL;
1019
1020         status.type = BOOT_STATUS_INFO;
1021         status.progress = -1;
1022         status.detail = NULL;
1023         status.message = _("Default boot cancelled");
1024
1025         discover_server_notify_boot_status(handler->server, &status);
1026 }
1027
1028 void device_handler_update_config(struct device_handler *handler,
1029                 struct config *config)
1030 {
1031         int rc;
1032
1033         rc = config_set(config);
1034         if (rc)
1035                 return;
1036
1037         discover_server_notify_config(handler->server, config);
1038         device_handler_update_lang(config->lang);
1039         device_handler_reinit(handler);
1040 }
1041
1042 static char *device_from_addr(void *ctx, struct pb_url *url)
1043 {
1044         char *ipaddr, *buf, *tok, *dev = NULL;
1045         const char *delim = " ";
1046         struct sockaddr_in *ip;
1047         struct sockaddr_in si;
1048         struct addrinfo *res;
1049         struct process *p;
1050         int rc;
1051
1052         /* Note: IPv4 only */
1053         rc = inet_pton(AF_INET, url->host, &(si.sin_addr));
1054         if (rc > 0) {
1055                 ipaddr = url->host;
1056         } else {
1057                 /* need to turn hostname into a valid IP */
1058                 rc = getaddrinfo(url->host, NULL, NULL, &res);
1059                 if (rc) {
1060                         pb_debug("%s: Invalid URL\n",__func__);
1061                         return NULL;
1062                 }
1063                 ipaddr = talloc_array(ctx,char,INET_ADDRSTRLEN);
1064                 ip = (struct sockaddr_in *) res->ai_addr;
1065                 inet_ntop(AF_INET, &(ip->sin_addr), ipaddr, INET_ADDRSTRLEN);
1066                 freeaddrinfo(res);
1067         }
1068
1069         const char *argv[] = {
1070                 pb_system_apps.ip,
1071                 "route", "show", "to", "match",
1072                 ipaddr,
1073                 NULL
1074         };
1075
1076         p = process_create(ctx);
1077
1078         p->path = pb_system_apps.ip;
1079         p->argv = argv;
1080         p->keep_stdout = true;
1081
1082         rc = process_run_sync(p);
1083
1084         if (rc) {
1085                 /* ip has complained for some reason; most likely
1086                  * there is no route to the host - bail out */
1087                 pb_debug("%s: No route to %s\n",__func__,url->host);
1088                 return NULL;
1089         }
1090
1091         buf = p->stdout_buf;
1092         /* If a route is found, ip-route output will be of the form
1093          * "... dev DEVNAME ... " */
1094         tok = strtok(buf, delim);
1095         while (tok) {
1096                 if (!strcmp(tok, "dev")) {
1097                         tok = strtok(NULL, delim);
1098                         dev = talloc_strdup(ctx, tok);
1099                         break;
1100                 }
1101                 tok = strtok(NULL, delim);
1102         }
1103
1104         process_release(p);
1105         if (dev)
1106                 pb_debug("%s: Found interface '%s'\n", __func__,dev);
1107         return dev;
1108 }
1109
1110
1111 void device_handler_process_url(struct device_handler *handler,
1112                 const char *url)
1113 {
1114         struct discover_context *ctx;
1115         struct discover_device *dev;
1116         struct boot_status *status;
1117         struct pb_url *pb_url;
1118         struct event *event;
1119         struct param *param;
1120
1121         status = talloc(handler, struct boot_status);
1122
1123         status->type = BOOT_STATUS_ERROR;
1124         status->progress = 0;
1125         status->detail = talloc_asprintf(status,
1126                         _("Received config URL %s"), url);
1127
1128         if (!handler->network) {
1129                 status->message = talloc_asprintf(handler,
1130                                         _("No network configured"));
1131                 goto msg;
1132         }
1133
1134         event = talloc(handler, struct event);
1135         event->type = EVENT_TYPE_USER;
1136         event->action = EVENT_ACTION_CONF;
1137
1138         event->params = talloc_array(event, struct param, 1);
1139         param = &event->params[0];
1140         param->name = talloc_strdup(event, "pxeconffile");
1141         param->value = talloc_strdup(event, url);
1142         event->n_params = 1;
1143
1144         pb_url = pb_url_parse(event, event->params->value);
1145         if (!pb_url || !pb_url->host) {
1146                 status->message = talloc_asprintf(handler,
1147                                         _("Invalid config URL!"));
1148                 goto msg;
1149         }
1150
1151         event->device = device_from_addr(event, pb_url);
1152         if (!event->device) {
1153                 status->message = talloc_asprintf(status,
1154                                         _("Unable to route to host %s"),
1155                                         pb_url->host);
1156                 goto msg;
1157         }
1158
1159         dev = discover_device_create(handler, event->device);
1160         ctx = device_handler_discover_context_create(handler, dev);
1161         ctx->event = event;
1162
1163         iterate_parsers(ctx);
1164
1165         device_handler_discover_context_commit(handler, ctx);
1166
1167         talloc_free(ctx);
1168
1169         status->type = BOOT_STATUS_INFO;
1170         status->message = talloc_asprintf(status, _("Config file %s parsed"),
1171                                         pb_url->file);
1172 msg:
1173         boot_status(handler, status);
1174         talloc_free(status);
1175 }
1176
1177 #ifndef PETITBOOT_TEST
1178
1179 static void device_handler_update_lang(const char *lang)
1180 {
1181         const char *cur_lang;
1182
1183         if (!lang)
1184                 return;
1185
1186         cur_lang = setlocale(LC_ALL, NULL);
1187         if (cur_lang && !strcmp(cur_lang, lang))
1188                 return;
1189
1190         setlocale(LC_ALL, lang);
1191 }
1192
1193 static int device_handler_init_sources(struct device_handler *handler)
1194 {
1195         /* init our device sources: udev, network and user events */
1196         handler->udev = udev_init(handler, handler->waitset);
1197         if (!handler->udev)
1198                 return -1;
1199
1200         handler->network = network_init(handler, handler->waitset,
1201                         handler->dry_run);
1202         if (!handler->network)
1203                 return -1;
1204
1205         handler->user_event = user_event_init(handler, handler->waitset);
1206         if (!handler->user_event)
1207                 return -1;
1208
1209         return 0;
1210 }
1211
1212 static void device_handler_reinit_sources(struct device_handler *handler)
1213 {
1214         /* if we haven't initialised sources previously (becuase we started in
1215          * safe mode), then init once here. */
1216         if (!(handler->udev || handler->network || handler->user_event)) {
1217                 device_handler_init_sources(handler);
1218                 return;
1219         }
1220
1221         udev_reinit(handler->udev);
1222
1223         network_shutdown(handler->network);
1224         handler->network = network_init(handler, handler->waitset,
1225                         handler->dry_run);
1226 }
1227
1228 static const char *fs_parameters(struct discover_device *dev,
1229                                  unsigned int rw_flags)
1230 {
1231         const char *fstype = discover_device_get_param(dev, "ID_FS_TYPE");
1232
1233         /* XFS journals are not cross-endian compatible; don't try recovery
1234          * even if we have a snapshot */
1235         if (!strncmp(fstype, "xfs", strlen("xfs")))
1236                 return "norecovery";
1237
1238         /* If we have a snapshot available allow touching the filesystem */
1239         if (dev->ramdisk)
1240                 return "";
1241
1242         if ((rw_flags | MS_RDONLY) != MS_RDONLY)
1243                 return "";
1244
1245         /* Avoid writes due to journal replay if we don't have a snapshot */
1246         if (!strncmp(fstype, "ext4", strlen("ext4")))
1247                 return "norecovery";
1248
1249         return "";
1250 }
1251
1252 static inline const char *get_device_path(struct discover_device *dev)
1253 {
1254         return dev->ramdisk ? dev->ramdisk->snapshot : dev->device_path;
1255 }
1256
1257 static bool check_existing_mount(struct discover_device *dev)
1258 {
1259         struct stat devstat, mntstat;
1260         const char *device_path;
1261         struct mntent *mnt;
1262         FILE *fp;
1263         int rc;
1264
1265         device_path = get_device_path(dev);
1266
1267         rc = stat(device_path, &devstat);
1268         if (rc) {
1269                 pb_debug("%s: stat failed: %s\n", __func__, strerror(errno));
1270                 return false;
1271         }
1272
1273         if (!S_ISBLK(devstat.st_mode)) {
1274                 pb_debug("%s: %s isn't a block device?\n", __func__,
1275                                 dev->device_path);
1276                 return false;
1277         }
1278
1279         fp = fopen("/proc/self/mounts", "r");
1280
1281         for (;;) {
1282                 mnt = getmntent(fp);
1283                 if (!mnt)
1284                         break;
1285
1286                 if (!mnt->mnt_fsname || mnt->mnt_fsname[0] != '/')
1287                         continue;
1288
1289                 rc = stat(mnt->mnt_fsname, &mntstat);
1290                 if (rc)
1291                         continue;
1292
1293                 if (!S_ISBLK(mntstat.st_mode))
1294                         continue;
1295
1296                 if (mntstat.st_rdev == devstat.st_rdev) {
1297                         dev->mount_path = talloc_strdup(dev, mnt->mnt_dir);
1298                         dev->mounted_rw = !!hasmntopt(mnt, "rw");
1299                         dev->mounted = true;
1300                         dev->unmount = false;
1301
1302                         pb_debug("%s: %s is already mounted (r%c) at %s\n",
1303                                         __func__, dev->device_path,
1304                                         dev->mounted_rw ? 'w' : 'o',
1305                                         mnt->mnt_dir);
1306                         break;
1307                 }
1308         }
1309
1310         fclose(fp);
1311
1312         return mnt != NULL;
1313 }
1314
1315 static int mount_device(struct discover_device *dev)
1316 {
1317         const char *fstype, *device_path;
1318         int rc;
1319
1320         if (!dev->device_path)
1321                 return -1;
1322
1323         if (dev->mounted)
1324                 return 0;
1325
1326         if (check_existing_mount(dev))
1327                 return 0;
1328
1329         fstype = discover_device_get_param(dev, "ID_FS_TYPE");
1330         if (!fstype)
1331                 return 0;
1332
1333         /* ext3 treats the norecovery option as an error, so mount the device
1334          * as an ext4 filesystem instead */
1335         if (!strncmp(fstype, "ext3", strlen("ext3"))) {
1336                 pb_debug("Mounting ext3 filesystem as ext4\n");
1337                 fstype = talloc_asprintf(dev, "ext4");
1338         }
1339
1340         dev->mount_path = join_paths(dev, mount_base(),
1341                                         dev->device_path);
1342
1343         if (pb_mkdir_recursive(dev->mount_path)) {
1344                 pb_log("couldn't create mount directory %s: %s\n",
1345                                 dev->mount_path, strerror(errno));
1346                 goto err_free;
1347         }
1348
1349         device_path = get_device_path(dev);
1350
1351         pb_log("mounting device %s read-only\n", dev->device_path);
1352         errno = 0;
1353         rc = mount(device_path, dev->mount_path, fstype,
1354                         MS_RDONLY | MS_SILENT,
1355                         fs_parameters(dev, MS_RDONLY));
1356         if (!rc) {
1357                 dev->mounted = true;
1358                 dev->mounted_rw = false;
1359                 dev->unmount = true;
1360                 return 0;
1361         }
1362
1363         pb_log("couldn't mount device %s: mount failed: %s\n",
1364                         device_path, strerror(errno));
1365
1366         /* If mount fails clean up any snapshot */
1367         devmapper_destroy_snapshot(dev);
1368
1369         pb_rmdir_recursive(mount_base(), dev->mount_path);
1370 err_free:
1371         talloc_free(dev->mount_path);
1372         dev->mount_path = NULL;
1373         return -1;
1374 }
1375
1376 static int umount_device(struct discover_device *dev)
1377 {
1378         const char *device_path;
1379         int rc;
1380
1381         if (!dev->mounted || !dev->unmount)
1382                 return 0;
1383
1384         device_path = get_device_path(dev);
1385
1386         pb_log("unmounting device %s\n", device_path);
1387         rc = umount(dev->mount_path);
1388         if (rc)
1389                 return -1;
1390
1391         dev->mounted = false;
1392         devmapper_destroy_snapshot(dev);
1393
1394         pb_rmdir_recursive(mount_base(), dev->mount_path);
1395
1396         talloc_free(dev->mount_path);
1397         dev->mount_path = NULL;
1398
1399         return 0;
1400 }
1401
1402 int device_request_write(struct discover_device *dev, bool *release)
1403 {
1404         const char *fstype, *device_path;
1405         const struct config *config;
1406         int rc;
1407
1408         *release = false;
1409
1410         config = config_get();
1411         if (!config->allow_writes)
1412                 return -1;
1413
1414         if (!dev->mounted)
1415                 return -1;
1416
1417         if (dev->mounted_rw)
1418                 return 0;
1419
1420         fstype = discover_device_get_param(dev, "ID_FS_TYPE");
1421
1422         device_path = get_device_path(dev);
1423
1424         pb_log("remounting device %s read-write\n", device_path);
1425
1426         rc = umount(dev->mount_path);
1427         if (rc) {
1428                 pb_log("Failed to unmount %s: %s\n",
1429                        dev->mount_path, strerror(errno));
1430                 return -1;
1431         }
1432
1433         rc = mount(device_path, dev->mount_path, fstype,
1434                         MS_SILENT,
1435                         fs_parameters(dev, MS_REMOUNT));
1436         if (rc)
1437                 goto mount_ro;
1438
1439         dev->mounted_rw = true;
1440         *release = true;
1441         return 0;
1442
1443 mount_ro:
1444         pb_log("Unable to remount device %s read-write: %s\n",
1445                device_path, strerror(errno));
1446         if (mount(device_path, dev->mount_path, fstype,
1447                         MS_RDONLY | MS_SILENT,
1448                         fs_parameters(dev, MS_RDONLY)))
1449                 pb_log("Unable to recover mount for %s: %s\n",
1450                        device_path, strerror(errno));
1451         return -1;
1452 }
1453
1454 void device_release_write(struct discover_device *dev, bool release)
1455 {
1456         const char *fstype, *device_path;
1457         int rc = 0;
1458
1459         if (!release)
1460                 return;
1461
1462         device_path = get_device_path(dev);
1463
1464         fstype = discover_device_get_param(dev, "ID_FS_TYPE");
1465
1466         pb_log("remounting device %s read-only\n", device_path);
1467
1468         if (umount(dev->mount_path)) {
1469                 pb_log("Failed to unmount %s\n", dev->mount_path);
1470                 return;
1471         }
1472         dev->mounted_rw = dev->mounted = false;
1473
1474         if (dev->ramdisk) {
1475                 devmapper_merge_snapshot(dev);
1476                 /* device_path becomes stale after merge */
1477                 device_path = get_device_path(dev);
1478         }
1479
1480         mount(device_path, dev->mount_path, fstype,
1481                         MS_RDONLY | MS_SILENT,
1482                         fs_parameters(dev, MS_RDONLY));
1483         if (rc)
1484                 pb_log("Failed to remount %s read-only: %s\n",
1485                        device_path, strerror(errno));
1486         else
1487                 dev->mounted = true;
1488 }
1489
1490 #else
1491
1492 static void device_handler_update_lang(const char *lang __attribute__((unused)))
1493 {
1494 }
1495
1496 static int device_handler_init_sources(
1497                 struct device_handler *handler __attribute__((unused)))
1498 {
1499         return 0;
1500 }
1501
1502 static void device_handler_reinit_sources(
1503                 struct device_handler *handler __attribute__((unused)))
1504 {
1505 }
1506
1507 static int umount_device(struct discover_device *dev __attribute__((unused)))
1508 {
1509         return 0;
1510 }
1511
1512 static int __attribute__((unused)) mount_device(
1513                 struct discover_device *dev __attribute__((unused)))
1514 {
1515         return 0;
1516 }
1517
1518 int device_request_write(struct discover_device *dev __attribute__((unused)),
1519                 bool *release)
1520 {
1521         *release = true;
1522         return 0;
1523 }
1524
1525 void device_release_write(struct discover_device *dev __attribute__((unused)),
1526         bool release __attribute__((unused)))
1527 {
1528 }
1529
1530 #endif
1531