gio/gdrive.c

   1 /* GIO - GLib Input, Output and Streaming Library
   2  *
   3  * Copyright (C) 2006-2007 Red Hat, Inc.
   4  *
   5  * This library is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU Lesser General Public
   7  * License as published by the Free Software Foundation; either
   8  * version 2 of the License, or (at your option) any later version.
   9  *
  10  * This library is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Lesser General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Lesser General
  16  * Public License along with this library; if not, see <http://www.gnu.org/licenses/>.
  17  *
  18  * Author: Alexander Larsson <alexl@redhat.com>
  19  *         David Zeuthen <davidz@redhat.com>
  20  */
  21
  22 #include "config.h"
  23 #include "gdrive.h"
  24 #include "gtask.h"
  25 #include "gthemedicon.h"
  26 #include "gasyncresult.h"
  27 #include "gioerror.h"
  28 #include "glibintl.h"
  29
  30
  31 /**
  32  * SECTION:gdrive
  33  * @short_description: Drive management
  34  * @include: gio/gio.h
  35  *
  36  * #GDrive - this represent a piece of hardware connected to the machine.
  37  * It's generally only created for removable hardware or hardware with
  38  * removable media.
  39  *
  40  * #GDrive is a container class for #GVolume objects that stem from
  41  * the same piece of media. As such, #GDrive abstracts a drive with
  42  * (or without) removable media and provides operations for querying
  43  * whether media is available, determining whether media change is
  44  * automatically detected and ejecting the media.
  45  *
  46  * If the #GDrive reports that media isn't automatically detected, one
  47  * can poll for media; typically one should not do this periodically
  48  * as a poll for media operation is potententially expensive and may
  49  * spin up the drive creating noise.
  50  *
  51  * #GDrive supports starting and stopping drives with authentication
  52  * support for the former. This can be used to support a diverse set
  53  * of use cases including connecting/disconnecting iSCSI devices,
  54  * powering down external disk enclosures and starting/stopping
  55  * multi-disk devices such as RAID devices. Note that the actual
  56  * semantics and side-effects of starting/stopping a #GDrive may vary
  57  * according to implementation. To choose the correct verbs in e.g. a
  58  * file manager, use g_drive_get_start_stop_type().
  59  *
  60  * For porting from GnomeVFS note that there is no equivalent of
  61  * #GDrive in that API.
  62  **/
  63
  64 typedef GDriveIface GDriveInterface;
  65 G_DEFINE_INTERFACE(GDrive, g_drive, G_TYPE_OBJECT)
  66
  67 static void
  68 g_drive_default_init (GDriveInterface *iface)
  69 {
  70   /**
  71    * GDrive::changed:
  72    * @drive: a #GDrive.
  73    *
  74    * Emitted when the drive's state has changed.
  75    **/
  76   g_signal_new (I_("changed"),
  77                 G_TYPE_DRIVE,
  78                 G_SIGNAL_RUN_LAST,
  79                 G_STRUCT_OFFSET (GDriveIface, changed),
  80                 NULL, NULL,
  81                 g_cclosure_marshal_VOID__VOID,
  82                 G_TYPE_NONE, 0);
  83
  84   /**
  85    * GDrive::disconnected:
  86    * @drive: a #GDrive.
  87    *
  88    * This signal is emitted when the #GDrive have been
  89    * disconnected. If the recipient is holding references to the
  90    * object they should release them so the object can be
  91    * finalized.
  92    **/
  93   g_signal_new (I_("disconnected"),
  94                 G_TYPE_DRIVE,
  95                 G_SIGNAL_RUN_LAST,
  96                 G_STRUCT_OFFSET (GDriveIface, disconnected),
  97                 NULL, NULL,
  98                 g_cclosure_marshal_VOID__VOID,
  99                 G_TYPE_NONE, 0);
 100
 101   /**
 102    * GDrive::eject-button:
 103    * @drive: a #GDrive.
 104    *
 105    * Emitted when the physical eject button (if any) of a drive has
 106    * been pressed.
 107    **/
 108   g_signal_new (I_("eject-button"),
 109                 G_TYPE_DRIVE,
 110                 G_SIGNAL_RUN_LAST,
 111                 G_STRUCT_OFFSET (GDriveIface, eject_button),
 112                 NULL, NULL,
 113                 g_cclosure_marshal_VOID__VOID,
 114                 G_TYPE_NONE, 0);
 115
 116   /**
 117    * GDrive::stop-button:
 118    * @drive: a #GDrive.
 119    *
 120    * Emitted when the physical stop button (if any) of a drive has
 121    * been pressed.
 122    *
 123    * Since: 2.22
 124    **/
 125   g_signal_new (I_("stop-button"),
 126                 G_TYPE_DRIVE,
 127                 G_SIGNAL_RUN_LAST,
 128                 G_STRUCT_OFFSET (GDriveIface, stop_button),
 129                 NULL, NULL,
 130                 g_cclosure_marshal_VOID__VOID,
 131                 G_TYPE_NONE, 0);
 132 }
 133
 134 /**
 135  * g_drive_get_name:
 136  * @drive: a #GDrive.
 137  *
 138  * Gets the name of @drive.
 139  *
 140  * Returns: a string containing @drive's name. The returned
 141  *     string should be freed when no longer needed.
 142  **/
 143 char *
 144 g_drive_get_name (GDrive *drive)
 145 {
 146   GDriveIface *iface;
 147
 148   g_return_val_if_fail (G_IS_DRIVE (drive), NULL);
 149
 150   iface = G_DRIVE_GET_IFACE (drive);
 151
 152   return (* iface->get_name) (drive);
 153 }
 154
 155 /**
 156  * g_drive_get_icon:
 157  * @drive: a #GDrive.
 158  *
 159  * Gets the icon for @drive.
 160  *
 161  * Returns: (transfer full): #GIcon for the @drive.
 162  *    Free the returned object with g_object_unref().
 163  **/
 164 GIcon *
 165 g_drive_get_icon (GDrive *drive)
 166 {
 167   GDriveIface *iface;
 168
 169   g_return_val_if_fail (G_IS_DRIVE (drive), NULL);
 170
 171   iface = G_DRIVE_GET_IFACE (drive);
 172
 173   return (* iface->get_icon) (drive);
 174 }
 175
 176 /**
 177  * g_drive_get_symbolic_icon:
 178  * @drive: a #GDrive.
 179  *
 180  * Gets the icon for @drive.
 181  *
 182  * Returns: (transfer full): symbolic #GIcon for the @drive.
 183  *    Free the returned object with g_object_unref().
 184  *
 185  * Since: 2.34
 186  **/
 187 GIcon *
 188 g_drive_get_symbolic_icon (GDrive *drive)
 189 {
 190   GDriveIface *iface;
 191   GIcon *ret;
 192
 193   g_return_val_if_fail (G_IS_DRIVE (drive), NULL);
 194
 195   iface = G_DRIVE_GET_IFACE (drive);
 196
 197   if (iface->get_symbolic_icon != NULL)
 198     ret = iface->get_symbolic_icon (drive);
 199   else
 200     ret = g_themed_icon_new_with_default_fallbacks ("drive-removable-media-symbolic");
 201
 202   return ret;
 203 }
 204
 205 /**
 206  * g_drive_has_volumes:
 207  * @drive: a #GDrive.
 208  *
 209  * Check if @drive has any mountable volumes.
 210  *
 211  * Returns: %TRUE if the @drive contains volumes, %FALSE otherwise.
 212  **/
 213 gboolean
 214 g_drive_has_volumes (GDrive *drive)
 215 {
 216   GDriveIface *iface;
 217
 218   g_return_val_if_fail (G_IS_DRIVE (drive), FALSE);
 219
 220   iface = G_DRIVE_GET_IFACE (drive);
 221
 222   return (* iface->has_volumes) (drive);
 223 }
 224
 225 /**
 226  * g_drive_get_volumes:
 227  * @drive: a #GDrive.
 228  *
 229  * Get a list of mountable volumes for @drive.
 230  *
 231  * The returned list should be freed with g_list_free(), after
 232  * its elements have been unreffed with g_object_unref().
 233  *
 234  * Returns: (element-type GVolume) (transfer full): #GList containing any #GVolume objects on the given @drive.
 235  **/
 236 GList *
 237 g_drive_get_volumes (GDrive *drive)
 238 {
 239   GDriveIface *iface;
 240
 241   g_return_val_if_fail (G_IS_DRIVE (drive), NULL);
 242
 243   iface = G_DRIVE_GET_IFACE (drive);
 244
 245   return (* iface->get_volumes) (drive);
 246 }
 247
 248 /**
 249  * g_drive_is_media_check_automatic:
 250  * @drive: a #GDrive.
 251  *
 252  * Checks if @drive is capabable of automatically detecting media changes.
 253  *
 254  * Returns: %TRUE if the @drive is capabable of automatically detecting
 255  *     media changes, %FALSE otherwise.
 256  **/
 257 gboolean
 258 g_drive_is_media_check_automatic (GDrive *drive)
 259 {
 260   GDriveIface *iface;
 261
 262   g_return_val_if_fail (G_IS_DRIVE (drive), FALSE);
 263
 264   iface = G_DRIVE_GET_IFACE (drive);
 265
 266   return (* iface->is_media_check_automatic) (drive);
 267 }
 268
 269 /**
 270  * g_drive_is_removable:
 271  * @drive: a #GDrive.
 272  *
 273  * Checks if the #GDrive and/or its media is considered removable by the user.
 274  * See g_drive_is_media_removable().
 275  *
 276  * Returns: %TRUE if @drive and/or its media is considered removable, %FALSE otherwise.
 277  *
 278  * Since: 2.50
 279  **/
 280 gboolean
 281 g_drive_is_removable (GDrive *drive)
 282 {
 283   GDriveIface *iface;
 284
 285   g_return_val_if_fail (G_IS_DRIVE (drive), FALSE);
 286
 287   iface = G_DRIVE_GET_IFACE (drive);
 288   if (iface->is_removable != NULL)
 289     return iface->is_removable (drive);
 290
 291   return FALSE;
 292 }
 293
 294 /**
 295  * g_drive_is_media_removable:
 296  * @drive: a #GDrive.
 297  *
 298  * Checks if the @drive supports removable media.
 299  *
 300  * Returns: %TRUE if @drive supports removable media, %FALSE otherwise.
 301  **/
 302 gboolean
 303 g_drive_is_media_removable (GDrive *drive)
 304 {
 305   GDriveIface *iface;
 306
 307   g_return_val_if_fail (G_IS_DRIVE (drive), FALSE);
 308
 309   iface = G_DRIVE_GET_IFACE (drive);
 310
 311   return (* iface->is_media_removable) (drive);
 312 }
 313
 314 /**
 315  * g_drive_has_media:
 316  * @drive: a #GDrive.
 317  *
 318  * Checks if the @drive has media. Note that the OS may not be polling
 319  * the drive for media changes; see g_drive_is_media_check_automatic()
 320  * for more details.
 321  *
 322  * Returns: %TRUE if @drive has media, %FALSE otherwise.
 323  **/
 324 gboolean
 325 g_drive_has_media (GDrive *drive)
 326 {
 327   GDriveIface *iface;
 328
 329   g_return_val_if_fail (G_IS_DRIVE (drive), FALSE);
 330
 331   iface = G_DRIVE_GET_IFACE (drive);
 332
 333   return (* iface->has_media) (drive);
 334 }
 335
 336 /**
 337  * g_drive_can_eject:
 338  * @drive: a #GDrive.
 339  *
 340  * Checks if a drive can be ejected.
 341  *
 342  * Returns: %TRUE if the @drive can be ejected, %FALSE otherwise.
 343  **/
 344 gboolean
 345 g_drive_can_eject (GDrive *drive)
 346 {
 347   GDriveIface *iface;
 348
 349   g_return_val_if_fail (G_IS_DRIVE (drive), FALSE);
 350
 351   iface = G_DRIVE_GET_IFACE (drive);
 352
 353   if (iface->can_eject == NULL)
 354     return FALSE;
 355
 356   return (* iface->can_eject) (drive);
 357 }
 358
 359 /**
 360  * g_drive_can_poll_for_media:
 361  * @drive: a #GDrive.
 362  *
 363  * Checks if a drive can be polled for media changes.
 364  *
 365  * Returns: %TRUE if the @drive can be polled for media changes,
 366  *     %FALSE otherwise.
 367  **/
 368 gboolean
 369 g_drive_can_poll_for_media (GDrive *drive)
 370 {
 371   GDriveIface *iface;
 372
 373   g_return_val_if_fail (G_IS_DRIVE (drive), FALSE);
 374
 375   iface = G_DRIVE_GET_IFACE (drive);
 376
 377   if (iface->poll_for_media == NULL)
 378     return FALSE;
 379
 380   return (* iface->can_poll_for_media) (drive);
 381 }
 382
 383 /**
 384  * g_drive_eject:
 385  * @drive: a #GDrive.
 386  * @flags: flags affecting the unmount if required for eject
 387  * @cancellable: (nullable): optional #GCancellable object, %NULL to ignore.
 388  * @callback: (nullable): a #GAsyncReadyCallback, or %NULL.
 389  * @user_data: user data to pass to @callback
 390  *
 391  * Asynchronously ejects a drive.
 392  *
 393  * When the operation is finished, @callback will be called.
 394  * You can then call g_drive_eject_finish() to obtain the
 395  * result of the operation.
 396  *
 397  * Deprecated: 2.22: Use g_drive_eject_with_operation() instead.
 398  **/
 399 void
 400 g_drive_eject (GDrive              *drive,
 401                GMountUnmountFlags   flags,
 402                GCancellable        *cancellable,
 403                GAsyncReadyCallback  callback,
 404                gpointer             user_data)
 405 {
 406   GDriveIface *iface;
 407
 408   g_return_if_fail (G_IS_DRIVE (drive));
 409
 410   iface = G_DRIVE_GET_IFACE (drive);
 411
 412   if (iface->eject == NULL)
 413     {
 414       g_task_report_new_error (drive, callback, user_data,
 415                                g_drive_eject_with_operation,
 416                                G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED,
 417                                _("drive doesn’t implement eject"));
 418       return;
 419     }
 420
 421   (* iface->eject) (drive, flags, cancellable, callback, user_data);
 422 }
 423
 424 /**
 425  * g_drive_eject_finish:
 426  * @drive: a #GDrive.
 427  * @result: a #GAsyncResult.
 428  * @error: a #GError, or %NULL
 429  *
 430  * Finishes ejecting a drive.
 431  *
 432  * Returns: %TRUE if the drive has been ejected successfully,
 433  *     %FALSE otherwise.
 434  *
 435  * Deprecated: 2.22: Use g_drive_eject_with_operation_finish() instead.
 436  **/
 437 gboolean
 438 g_drive_eject_finish (GDrive        *drive,
 439                       GAsyncResult  *result,
 440                       GError       **error)
 441 {
 442   GDriveIface *iface;
 443
 444   g_return_val_if_fail (G_IS_DRIVE (drive), FALSE);
 445   g_return_val_if_fail (G_IS_ASYNC_RESULT (result), FALSE);
 446
 447   if (g_async_result_legacy_propagate_error (result, error))
 448     return FALSE;
 449   else if (g_async_result_is_tagged (result, g_drive_eject_with_operation))
 450     return g_task_propagate_boolean (G_TASK (result), error);
 451
 452   iface = G_DRIVE_GET_IFACE (drive);
 453
 454   return (* iface->eject_finish) (drive, result, error);
 455 }
 456
 457 /**
 458  * g_drive_eject_with_operation:
 459  * @drive: a #GDrive.
 460  * @flags: flags affecting the unmount if required for eject
 461  * @mount_operation: (nullable): a #GMountOperation or %NULL to avoid
 462  *     user interaction.
 463  * @cancellable: (nullable): optional #GCancellable object, %NULL to ignore.
 464  * @callback: (nullable): a #GAsyncReadyCallback, or %NULL.
 465  * @user_data: user data passed to @callback.
 466  *
 467  * Ejects a drive. This is an asynchronous operation, and is
 468  * finished by calling g_drive_eject_with_operation_finish() with the @drive
 469  * and #GAsyncResult data returned in the @callback.
 470  *
 471  * Since: 2.22
 472  **/
 473 void
 474 g_drive_eject_with_operation (GDrive              *drive,
 475                               GMountUnmountFlags   flags,
 476                               GMountOperation     *mount_operation,
 477                               GCancellable        *cancellable,
 478                               GAsyncReadyCallback  callback,
 479                               gpointer             user_data)
 480 {
 481   GDriveIface *iface;
 482
 483   g_return_if_fail (G_IS_DRIVE (drive));
 484
 485   iface = G_DRIVE_GET_IFACE (drive);
 486
 487   if (iface->eject == NULL && iface->eject_with_operation == NULL)
 488     {
 489       g_task_report_new_error (drive, callback, user_data,
 490                                g_drive_eject_with_operation,
 491                                G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED,
 492                                /* Translators: This is an error
 493                                 * message for drive objects that
 494                                 * don't implement any of eject or eject_with_operation. */
 495                                _("drive doesn’t implement eject or eject_with_operation"));
 496       return;
 497     }
 498
 499   if (iface->eject_with_operation != NULL)
 500     (* iface->eject_with_operation) (drive, flags, mount_operation, cancellable, callback, user_data);
 501   else
 502     (* iface->eject) (drive, flags, cancellable, callback, user_data);
 503 }
 504
 505 /**
 506  * g_drive_eject_with_operation_finish:
 507  * @drive: a #GDrive.
 508  * @result: a #GAsyncResult.
 509  * @error: a #GError location to store the error occurring, or %NULL to
 510  *     ignore.
 511  *
 512  * Finishes ejecting a drive. If any errors occurred during the operation,
 513  * @error will be set to contain the errors and %FALSE will be returned.
 514  *
 515  * Returns: %TRUE if the drive was successfully ejected. %FALSE otherwise.
 516  *
 517  * Since: 2.22
 518  **/
 519 gboolean
 520 g_drive_eject_with_operation_finish (GDrive        *drive,
 521                                      GAsyncResult  *result,
 522                                      GError       **error)
 523 {
 524   GDriveIface *iface;
 525
 526   g_return_val_if_fail (G_IS_DRIVE (drive), FALSE);
 527   g_return_val_if_fail (G_IS_ASYNC_RESULT (result), FALSE);
 528
 529   if (g_async_result_legacy_propagate_error (result, error))
 530     return FALSE;
 531   else if (g_async_result_is_tagged (result, g_drive_eject_with_operation))
 532     return g_task_propagate_boolean (G_TASK (result), error);
 533
 534   iface = G_DRIVE_GET_IFACE (drive);
 535   if (iface->eject_with_operation_finish != NULL)
 536     return (* iface->eject_with_operation_finish) (drive, result, error);
 537   else
 538     return (* iface->eject_finish) (drive, result, error);
 539 }
 540
 541 /**
 542  * g_drive_poll_for_media:
 543  * @drive: a #GDrive.
 544  * @cancellable: (nullable): optional #GCancellable object, %NULL to ignore.
 545  * @callback: (nullable): a #GAsyncReadyCallback, or %NULL.
 546  * @user_data: user data to pass to @callback
 547  *
 548  * Asynchronously polls @drive to see if media has been inserted or removed.
 549  *
 550  * When the operation is finished, @callback will be called.
 551  * You can then call g_drive_poll_for_media_finish() to obtain the
 552  * result of the operation.
 553  **/
 554 void
 555 g_drive_poll_for_media (GDrive              *drive,
 556                         GCancellable        *cancellable,
 557                         GAsyncReadyCallback  callback,
 558                         gpointer             user_data)
 559 {
 560   GDriveIface *iface;
 561
 562   g_return_if_fail (G_IS_DRIVE (drive));
 563
 564   iface = G_DRIVE_GET_IFACE (drive);
 565
 566   if (iface->poll_for_media == NULL)
 567     {
 568       g_task_report_new_error (drive, callback, user_data,
 569                                g_drive_poll_for_media,
 570                                G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED,
 571                                _("drive doesn’t implement polling for media"));
 572       return;
 573     }
 574
 575   (* iface->poll_for_media) (drive, cancellable, callback, user_data);
 576 }
 577
 578 /**
 579  * g_drive_poll_for_media_finish:
 580  * @drive: a #GDrive.
 581  * @result: a #GAsyncResult.
 582  * @error: a #GError, or %NULL
 583  *
 584  * Finishes an operation started with g_drive_poll_for_media() on a drive.
 585  *
 586  * Returns: %TRUE if the drive has been poll_for_mediaed successfully,
 587  *     %FALSE otherwise.
 588  **/
 589 gboolean
 590 g_drive_poll_for_media_finish (GDrive        *drive,
 591                                GAsyncResult  *result,
 592                                GError       **error)
 593 {
 594   GDriveIface *iface;
 595
 596   g_return_val_if_fail (G_IS_DRIVE (drive), FALSE);
 597   g_return_val_if_fail (G_IS_ASYNC_RESULT (result), FALSE);
 598
 599   if (g_async_result_legacy_propagate_error (result, error))
 600     return FALSE;
 601   else if (g_async_result_is_tagged (result, g_drive_poll_for_media))
 602     return g_task_propagate_boolean (G_TASK (result), error);
 603
 604   iface = G_DRIVE_GET_IFACE (drive);
 605
 606   return (* iface->poll_for_media_finish) (drive, result, error);
 607 }
 608
 609 /**
 610  * g_drive_get_identifier:
 611  * @drive: a #GDrive
 612  * @kind: the kind of identifier to return
 613  *
 614  * Gets the identifier of the given kind for @drive.
 615  *
 616  * Returns: a newly allocated string containing the
 617  *     requested identfier, or %NULL if the #GDrive
 618  *     doesn't have this kind of identifier.
 619  */
 620 char *
 621 g_drive_get_identifier (GDrive     *drive,
 622                         const char *kind)
 623 {
 624   GDriveIface *iface;
 625
 626   g_return_val_if_fail (G_IS_DRIVE (drive), NULL);
 627   g_return_val_if_fail (kind != NULL, NULL);
 628
 629   iface = G_DRIVE_GET_IFACE (drive);
 630
 631   if (iface->get_identifier == NULL)
 632     return NULL;
 633
 634   return (* iface->get_identifier) (drive, kind);
 635 }
 636
 637 /**
 638  * g_drive_enumerate_identifiers:
 639  * @drive: a #GDrive
 640  *
 641  * Gets the kinds of identifiers that @drive has.
 642  * Use g_drive_get_identifier() to obtain the identifiers
 643  * themselves.
 644  *
 645  * Returns: (transfer full) (array zero-terminated=1): a %NULL-terminated
 646  *     array of strings containing kinds of identifiers. Use g_strfreev()
 647  *     to free.
 648  */
 649 char **
 650 g_drive_enumerate_identifiers (GDrive *drive)
 651 {
 652   GDriveIface *iface;
 653
 654   g_return_val_if_fail (G_IS_DRIVE (drive), NULL);
 655   iface = G_DRIVE_GET_IFACE (drive);
 656
 657   if (iface->enumerate_identifiers == NULL)
 658     return NULL;
 659
 660   return (* iface->enumerate_identifiers) (drive);
 661 }
 662
 663 /**
 664  * g_drive_get_start_stop_type:
 665  * @drive: a #GDrive.
 666  *
 667  * Gets a hint about how a drive can be started/stopped.
 668  *
 669  * Returns: A value from the #GDriveStartStopType enumeration.
 670  *
 671  * Since: 2.22
 672  */
 673 GDriveStartStopType
 674 g_drive_get_start_stop_type (GDrive *drive)
 675 {
 676   GDriveIface *iface;
 677
 678   g_return_val_if_fail (G_IS_DRIVE (drive), FALSE);
 679
 680   iface = G_DRIVE_GET_IFACE (drive);
 681
 682   if (iface->get_start_stop_type == NULL)
 683     return G_DRIVE_START_STOP_TYPE_UNKNOWN;
 684
 685   return (* iface->get_start_stop_type) (drive);
 686 }
 687
 688
 689 /**
 690  * g_drive_can_start:
 691  * @drive: a #GDrive.
 692  *
 693  * Checks if a drive can be started.
 694  *
 695  * Returns: %TRUE if the @drive can be started, %FALSE otherwise.
 696  *
 697  * Since: 2.22
 698  */
 699 gboolean
 700 g_drive_can_start (GDrive *drive)
 701 {
 702   GDriveIface *iface;
 703
 704   g_return_val_if_fail (G_IS_DRIVE (drive), FALSE);
 705
 706   iface = G_DRIVE_GET_IFACE (drive);
 707
 708   if (iface->can_start == NULL)
 709     return FALSE;
 710
 711   return (* iface->can_start) (drive);
 712 }
 713
 714 /**
 715  * g_drive_can_start_degraded:
 716  * @drive: a #GDrive.
 717  *
 718  * Checks if a drive can be started degraded.
 719  *
 720  * Returns: %TRUE if the @drive can be started degraded, %FALSE otherwise.
 721  *
 722  * Since: 2.22
 723  */
 724 gboolean
 725 g_drive_can_start_degraded (GDrive *drive)
 726 {
 727   GDriveIface *iface;
 728
 729   g_return_val_if_fail (G_IS_DRIVE (drive), FALSE);
 730
 731   iface = G_DRIVE_GET_IFACE (drive);
 732
 733   if (iface->can_start_degraded == NULL)
 734     return FALSE;
 735
 736   return (* iface->can_start_degraded) (drive);
 737 }
 738
 739 /**
 740  * g_drive_start:
 741  * @drive: a #GDrive.
 742  * @flags: flags affecting the start operation.
 743  * @mount_operation: (nullable): a #GMountOperation or %NULL to avoid
 744  *     user interaction.
 745  * @cancellable: (nullable): optional #GCancellable object, %NULL to ignore.
 746  * @callback: (nullable): a #GAsyncReadyCallback, or %NULL.
 747  * @user_data: user data to pass to @callback
 748  *
 749  * Asynchronously starts a drive.
 750  *
 751  * When the operation is finished, @callback will be called.
 752  * You can then call g_drive_start_finish() to obtain the
 753  * result of the operation.
 754  *
 755  * Since: 2.22
 756  */
 757 void
 758 g_drive_start (GDrive              *drive,
 759                GDriveStartFlags     flags,
 760                GMountOperation     *mount_operation,
 761                GCancellable        *cancellable,
 762                GAsyncReadyCallback  callback,
 763                gpointer             user_data)
 764 {
 765   GDriveIface *iface;
 766
 767   g_return_if_fail (G_IS_DRIVE (drive));
 768
 769   iface = G_DRIVE_GET_IFACE (drive);
 770
 771   if (iface->start == NULL)
 772     {
 773       g_task_report_new_error (drive, callback, user_data,
 774                                g_drive_start,
 775                                G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED,
 776                                _("drive doesn’t implement start"));
 777       return;
 778     }
 779
 780   (* iface->start) (drive, flags, mount_operation, cancellable, callback, user_data);
 781 }
 782
 783 /**
 784  * g_drive_start_finish:
 785  * @drive: a #GDrive.
 786  * @result: a #GAsyncResult.
 787  * @error: a #GError, or %NULL
 788  *
 789  * Finishes starting a drive.
 790  *
 791  * Returns: %TRUE if the drive has been started successfully,
 792  *     %FALSE otherwise.
 793  *
 794  * Since: 2.22
 795  */
 796 gboolean
 797 g_drive_start_finish (GDrive         *drive,
 798                       GAsyncResult   *result,
 799                       GError        **error)
 800 {
 801   GDriveIface *iface;
 802
 803   g_return_val_if_fail (G_IS_DRIVE (drive), FALSE);
 804   g_return_val_if_fail (G_IS_ASYNC_RESULT (result), FALSE);
 805
 806   if (g_async_result_legacy_propagate_error (result, error))
 807     return FALSE;
 808   else if (g_async_result_is_tagged (result, g_drive_start))
 809     return g_task_propagate_boolean (G_TASK (result), error);
 810
 811   iface = G_DRIVE_GET_IFACE (drive);
 812
 813   return (* iface->start_finish) (drive, result, error);
 814 }
 815
 816 /**
 817  * g_drive_can_stop:
 818  * @drive: a #GDrive.
 819  *
 820  * Checks if a drive can be stopped.
 821  *
 822  * Returns: %TRUE if the @drive can be stopped, %FALSE otherwise.
 823  *
 824  * Since: 2.22
 825  */
 826 gboolean
 827 g_drive_can_stop (GDrive *drive)
 828 {
 829   GDriveIface *iface;
 830
 831   g_return_val_if_fail (G_IS_DRIVE (drive), FALSE);
 832
 833   iface = G_DRIVE_GET_IFACE (drive);
 834
 835   if (iface->can_stop == NULL)
 836     return FALSE;
 837
 838   return (* iface->can_stop) (drive);
 839 }
 840
 841 /**
 842  * g_drive_stop:
 843  * @drive: a #GDrive.
 844  * @flags: flags affecting the unmount if required for stopping.
 845  * @mount_operation: (nullable): a #GMountOperation or %NULL to avoid
 846  *     user interaction.
 847  * @cancellable: (nullable): optional #GCancellable object, %NULL to ignore.
 848  * @callback: (nullable): a #GAsyncReadyCallback, or %NULL.
 849  * @user_data: user data to pass to @callback
 850  *
 851  * Asynchronously stops a drive.
 852  *
 853  * When the operation is finished, @callback will be called.
 854  * You can then call g_drive_stop_finish() to obtain the
 855  * result of the operation.
 856  *
 857  * Since: 2.22
 858  */
 859 void
 860 g_drive_stop (GDrive               *drive,
 861               GMountUnmountFlags    flags,
 862               GMountOperation      *mount_operation,
 863               GCancellable         *cancellable,
 864               GAsyncReadyCallback   callback,
 865               gpointer              user_data)
 866 {
 867   GDriveIface *iface;
 868
 869   g_return_if_fail (G_IS_DRIVE (drive));
 870
 871   iface = G_DRIVE_GET_IFACE (drive);
 872
 873   if (iface->stop == NULL)
 874     {
 875       g_task_report_new_error (drive, callback, user_data,
 876                                g_drive_start,
 877                                G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED,
 878                                _("drive doesn’t implement stop"));
 879       return;
 880     }
 881
 882   (* iface->stop) (drive, flags, mount_operation, cancellable, callback, user_data);
 883 }
 884
 885 /**
 886  * g_drive_stop_finish:
 887  * @drive: a #GDrive.
 888  * @result: a #GAsyncResult.
 889  * @error: a #GError, or %NULL
 890  *
 891  * Finishes stopping a drive.
 892  *
 893  * Returns: %TRUE if the drive has been stopped successfully,
 894  *     %FALSE otherwise.
 895  *
 896  * Since: 2.22
 897  */
 898 gboolean
 899 g_drive_stop_finish (GDrive        *drive,
 900                      GAsyncResult  *result,
 901                      GError       **error)
 902 {
 903   GDriveIface *iface;
 904
 905   g_return_val_if_fail (G_IS_DRIVE (drive), FALSE);
 906   g_return_val_if_fail (G_IS_ASYNC_RESULT (result), FALSE);
 907
 908   if (g_async_result_legacy_propagate_error (result, error))
 909     return FALSE;
 910   else if (g_async_result_is_tagged (result, g_drive_start))
 911     return g_task_propagate_boolean (G_TASK (result), error);
 912
 913   iface = G_DRIVE_GET_IFACE (drive);
 914
 915   return (* iface->stop_finish) (drive, result, error);
 916 }
 917
 918 /**
 919  * g_drive_get_sort_key:
 920  * @drive: A #GDrive.
 921  *
 922  * Gets the sort key for @drive, if any.
 923  *
 924  * Returns: Sorting key for @drive or %NULL if no such key is available.
 925  *
 926  * Since: 2.32
 927  */
 928 const gchar *
 929 g_drive_get_sort_key (GDrive  *drive)
 930 {
 931   const gchar *ret = NULL;
 932   GDriveIface *iface;
 933
 934   g_return_val_if_fail (G_IS_DRIVE (drive), NULL);
 935
 936   iface = G_DRIVE_GET_IFACE (drive);
 937   if (iface->get_sort_key != NULL)
 938     ret = iface->get_sort_key (drive);
 939
 940   return ret;
 941 }