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, write to the
  17  * Free Software Foundation, Inc., 59 Temple Place, Suite 330,
  18  * Boston, MA 02111-1307, USA.
  19  *
  20  * Author: Alexander Larsson <alexl@redhat.com>
  21  *         David Zeuthen <davidz@redhat.com>
  22  */
  23
  24 #include "config.h"
  25 #include "gdrive.h"
  26 #include "gtask.h"
  27 #include "gthemedicon.h"
  28 #include "gasyncresult.h"
  29 #include "gioerror.h"
  30 #include "glibintl.h"
  31
  32
  33 /**
  34  * SECTION:gdrive
  35  * @short_description: Drive management
  36  * @include: gio/gio.h
  37  *
  38  * #GDrive - this represent a piece of hardware connected to the machine.
  39  * It's generally only created for removable hardware or hardware with
  40  * removable media.
  41  *
  42  * #GDrive is a container class for #GVolume objects that stem from
  43  * the same piece of media. As such, #GDrive abstracts a drive with
  44  * (or without) removable media and provides operations for querying
  45  * whether media is available, determining whether media change is
  46  * automatically detected and ejecting the media.
  47  *
  48  * If the #GDrive reports that media isn't automatically detected, one
  49  * can poll for media; typically one should not do this periodically
  50  * as a poll for media operation is potententially expensive and may
  51  * spin up the drive creating noise.
  52  *
  53  * #GDrive supports starting and stopping drives with authentication
  54  * support for the former. This can be used to support a diverse set
  55  * of use cases including connecting/disconnecting iSCSI devices,
  56  * powering down external disk enclosures and starting/stopping
  57  * multi-disk devices such as RAID devices. Note that the actual
  58  * semantics and side-effects of starting/stopping a #GDrive may vary
  59  * according to implementation. To choose the correct verbs in e.g. a
  60  * file manager, use g_drive_get_start_stop_type().
  61  *
  62  * For porting from GnomeVFS note that there is no equivalent of
  63  * #GDrive in that API.
  64  **/
  65
  66 typedef GDriveIface GDriveInterface;
  67 G_DEFINE_INTERFACE(GDrive, g_drive, G_TYPE_OBJECT)
  68
  69 static void
  70 g_drive_default_init (GDriveInterface *iface)
  71 {
  72   /**
  73    * GDrive::changed:
  74    * @drive: a #GDrive.
  75    *
  76    * Emitted when the drive's state has changed.
  77    **/
  78   g_signal_new (I_("changed"),
  79                 G_TYPE_DRIVE,
  80                 G_SIGNAL_RUN_LAST,
  81                 G_STRUCT_OFFSET (GDriveIface, changed),
  82                 NULL, NULL,
  83                 g_cclosure_marshal_VOID__VOID,
  84                 G_TYPE_NONE, 0);
  85
  86   /**
  87    * GDrive::disconnected:
  88    * @drive: a #GDrive.
  89    *
  90    * This signal is emitted when the #GDrive have been
  91    * disconnected. If the recipient is holding references to the
  92    * object they should release them so the object can be
  93    * finalized.
  94    **/
  95   g_signal_new (I_("disconnected"),
  96                 G_TYPE_DRIVE,
  97                 G_SIGNAL_RUN_LAST,
  98                 G_STRUCT_OFFSET (GDriveIface, disconnected),
  99                 NULL, NULL,
 100                 g_cclosure_marshal_VOID__VOID,
 101                 G_TYPE_NONE, 0);
 102
 103   /**
 104    * GDrive::eject-button:
 105    * @drive: a #GDrive.
 106    *
 107    * Emitted when the physical eject button (if any) of a drive has
 108    * been pressed.
 109    **/
 110   g_signal_new (I_("eject-button"),
 111                 G_TYPE_DRIVE,
 112                 G_SIGNAL_RUN_LAST,
 113                 G_STRUCT_OFFSET (GDriveIface, eject_button),
 114                 NULL, NULL,
 115                 g_cclosure_marshal_VOID__VOID,
 116                 G_TYPE_NONE, 0);
 117
 118   /**
 119    * GDrive::stop-button:
 120    * @drive: a #GDrive.
 121    *
 122    * Emitted when the physical stop button (if any) of a drive has
 123    * been pressed.
 124    *
 125    * Since: 2.22
 126    **/
 127   g_signal_new (I_("stop-button"),
 128                 G_TYPE_DRIVE,
 129                 G_SIGNAL_RUN_LAST,
 130                 G_STRUCT_OFFSET (GDriveIface, stop_button),
 131                 NULL, NULL,
 132                 g_cclosure_marshal_VOID__VOID,
 133                 G_TYPE_NONE, 0);
 134 }
 135
 136 /**
 137  * g_drive_get_name:
 138  * @drive: a #GDrive.
 139  *
 140  * Gets the name of @drive.
 141  *
 142  * Returns: a string containing @drive's name. The returned
 143  *     string should be freed when no longer needed.
 144  **/
 145 char *
 146 g_drive_get_name (GDrive *drive)
 147 {
 148   GDriveIface *iface;
 149
 150   g_return_val_if_fail (G_IS_DRIVE (drive), NULL);
 151
 152   iface = G_DRIVE_GET_IFACE (drive);
 153
 154   return (* iface->get_name) (drive);
 155 }
 156
 157 /**
 158  * g_drive_get_icon:
 159  * @drive: a #GDrive.
 160  *
 161  * Gets the icon for @drive.
 162  *
 163  * Returns: (transfer full): #GIcon for the @drive.
 164  *    Free the returned object with g_object_unref().
 165  **/
 166 GIcon *
 167 g_drive_get_icon (GDrive *drive)
 168 {
 169   GDriveIface *iface;
 170
 171   g_return_val_if_fail (G_IS_DRIVE (drive), NULL);
 172
 173   iface = G_DRIVE_GET_IFACE (drive);
 174
 175   return (* iface->get_icon) (drive);
 176 }
 177
 178 /**
 179  * g_drive_get_symbolic_icon:
 180  * @drive: a #GDrive.
 181  *
 182  * Gets the icon for @drive.
 183  *
 184  * Returns: (transfer full): symbolic #GIcon for the @drive.
 185  *    Free the returned object with g_object_unref().
 186  *
 187  * Since: 2.34
 188  **/
 189 GIcon *
 190 g_drive_get_symbolic_icon (GDrive *drive)
 191 {
 192   GDriveIface *iface;
 193   GIcon *ret;
 194
 195   g_return_val_if_fail (G_IS_DRIVE (drive), NULL);
 196
 197   iface = G_DRIVE_GET_IFACE (drive);
 198
 199   if (iface->get_symbolic_icon != NULL)
 200     ret = iface->get_symbolic_icon (drive);
 201   else
 202     ret = g_themed_icon_new_with_default_fallbacks ("drive-removable-media-symbolic");
 203
 204   return ret;
 205 }
 206
 207 /**
 208  * g_drive_has_volumes:
 209  * @drive: a #GDrive.
 210  *
 211  * Check if @drive has any mountable volumes.
 212  *
 213  * Returns: %TRUE if the @drive contains volumes, %FALSE otherwise.
 214  **/
 215 gboolean
 216 g_drive_has_volumes (GDrive *drive)
 217 {
 218   GDriveIface *iface;
 219
 220   g_return_val_if_fail (G_IS_DRIVE (drive), FALSE);
 221
 222   iface = G_DRIVE_GET_IFACE (drive);
 223
 224   return (* iface->has_volumes) (drive);
 225 }
 226
 227 /**
 228  * g_drive_get_volumes:
 229  * @drive: a #GDrive.
 230  *
 231  * Get a list of mountable volumes for @drive.
 232  *
 233  * The returned list should be freed with g_list_free(), after
 234  * its elements have been unreffed with g_object_unref().
 235  *
 236  * Returns: (element-type GVolume) (transfer full): #GList containing any #GVolume objects on the given @drive.
 237  **/
 238 GList *
 239 g_drive_get_volumes (GDrive *drive)
 240 {
 241   GDriveIface *iface;
 242
 243   g_return_val_if_fail (G_IS_DRIVE (drive), NULL);
 244
 245   iface = G_DRIVE_GET_IFACE (drive);
 246
 247   return (* iface->get_volumes) (drive);
 248 }
 249
 250 /**
 251  * g_drive_is_media_check_automatic:
 252  * @drive: a #GDrive.
 253  *
 254  * Checks if @drive is capabable of automatically detecting media changes.
 255  *
 256  * Returns: %TRUE if the @drive is capabable of automatically detecting
 257  *     media changes, %FALSE otherwise.
 258  **/
 259 gboolean
 260 g_drive_is_media_check_automatic (GDrive *drive)
 261 {
 262   GDriveIface *iface;
 263
 264   g_return_val_if_fail (G_IS_DRIVE (drive), FALSE);
 265
 266   iface = G_DRIVE_GET_IFACE (drive);
 267
 268   return (* iface->is_media_check_automatic) (drive);
 269 }
 270
 271 /**
 272  * g_drive_is_media_removable:
 273  * @drive: a #GDrive.
 274  *
 275  * Checks if the @drive supports removable media.
 276  *
 277  * Returns: %TRUE if @drive supports removable media, %FALSE otherwise.
 278  **/
 279 gboolean
 280 g_drive_is_media_removable (GDrive *drive)
 281 {
 282   GDriveIface *iface;
 283
 284   g_return_val_if_fail (G_IS_DRIVE (drive), FALSE);
 285
 286   iface = G_DRIVE_GET_IFACE (drive);
 287
 288   return (* iface->is_media_removable) (drive);
 289 }
 290
 291 /**
 292  * g_drive_has_media:
 293  * @drive: a #GDrive.
 294  *
 295  * Checks if the @drive has media. Note that the OS may not be polling
 296  * the drive for media changes; see g_drive_is_media_check_automatic()
 297  * for more details.
 298  *
 299  * Returns: %TRUE if @drive has media, %FALSE otherwise.
 300  **/
 301 gboolean
 302 g_drive_has_media (GDrive *drive)
 303 {
 304   GDriveIface *iface;
 305
 306   g_return_val_if_fail (G_IS_DRIVE (drive), FALSE);
 307
 308   iface = G_DRIVE_GET_IFACE (drive);
 309
 310   return (* iface->has_media) (drive);
 311 }
 312
 313 /**
 314  * g_drive_can_eject:
 315  * @drive: a #GDrive.
 316  *
 317  * Checks if a drive can be ejected.
 318  *
 319  * Returns: %TRUE if the @drive can be ejected, %FALSE otherwise.
 320  **/
 321 gboolean
 322 g_drive_can_eject (GDrive *drive)
 323 {
 324   GDriveIface *iface;
 325
 326   g_return_val_if_fail (G_IS_DRIVE (drive), FALSE);
 327
 328   iface = G_DRIVE_GET_IFACE (drive);
 329
 330   if (iface->can_eject == NULL)
 331     return FALSE;
 332
 333   return (* iface->can_eject) (drive);
 334 }
 335
 336 /**
 337  * g_drive_can_poll_for_media:
 338  * @drive: a #GDrive.
 339  *
 340  * Checks if a drive can be polled for media changes.
 341  *
 342  * Returns: %TRUE if the @drive can be polled for media changes,
 343  *     %FALSE otherwise.
 344  **/
 345 gboolean
 346 g_drive_can_poll_for_media (GDrive *drive)
 347 {
 348   GDriveIface *iface;
 349
 350   g_return_val_if_fail (G_IS_DRIVE (drive), FALSE);
 351
 352   iface = G_DRIVE_GET_IFACE (drive);
 353
 354   if (iface->poll_for_media == NULL)
 355     return FALSE;
 356
 357   return (* iface->can_poll_for_media) (drive);
 358 }
 359
 360 /**
 361  * g_drive_eject:
 362  * @drive: a #GDrive.
 363  * @flags: flags affecting the unmount if required for eject
 364  * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
 365  * @callback: (allow-none): a #GAsyncReadyCallback, or %NULL.
 366  * @user_data: user data to pass to @callback
 367  *
 368  * Asynchronously ejects a drive.
 369  *
 370  * When the operation is finished, @callback will be called.
 371  * You can then call g_drive_eject_finish() to obtain the
 372  * result of the operation.
 373  *
 374  * Deprecated: 2.22: Use g_drive_eject_with_operation() instead.
 375  **/
 376 void
 377 g_drive_eject (GDrive              *drive,
 378                GMountUnmountFlags   flags,
 379                GCancellable        *cancellable,
 380                GAsyncReadyCallback  callback,
 381                gpointer             user_data)
 382 {
 383   GDriveIface *iface;
 384
 385   g_return_if_fail (G_IS_DRIVE (drive));
 386
 387   iface = G_DRIVE_GET_IFACE (drive);
 388
 389   if (iface->eject == NULL)
 390     {
 391       g_task_report_new_error (drive, callback, user_data,
 392                                g_drive_eject_with_operation,
 393                                G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED,
 394                                _("drive doesn't implement eject"));
 395       return;
 396     }
 397
 398   (* iface->eject) (drive, flags, cancellable, callback, user_data);
 399 }
 400
 401 /**
 402  * g_drive_eject_finish:
 403  * @drive: a #GDrive.
 404  * @result: a #GAsyncResult.
 405  * @error: a #GError, or %NULL
 406  *
 407  * Finishes ejecting a drive.
 408  *
 409  * Returns: %TRUE if the drive has been ejected successfully,
 410  *     %FALSE otherwise.
 411  *
 412  * Deprecated: 2.22: Use g_drive_eject_with_operation_finish() instead.
 413  **/
 414 gboolean
 415 g_drive_eject_finish (GDrive        *drive,
 416                       GAsyncResult  *result,
 417                       GError       **error)
 418 {
 419   GDriveIface *iface;
 420
 421   g_return_val_if_fail (G_IS_DRIVE (drive), FALSE);
 422   g_return_val_if_fail (G_IS_ASYNC_RESULT (result), FALSE);
 423
 424   if (g_async_result_legacy_propagate_error (result, error))
 425     return FALSE;
 426   else if (g_async_result_is_tagged (result, g_drive_eject_with_operation))
 427     return g_task_propagate_boolean (G_TASK (result), error);
 428
 429   iface = G_DRIVE_GET_IFACE (drive);
 430
 431   return (* iface->eject_finish) (drive, result, error);
 432 }
 433
 434 /**
 435  * g_drive_eject_with_operation:
 436  * @drive: a #GDrive.
 437  * @flags: flags affecting the unmount if required for eject
 438  * @mount_operation: (allow-none): a #GMountOperation or %NULL to avoid
 439  *     user interaction.
 440  * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
 441  * @callback: (allow-none): a #GAsyncReadyCallback, or %NULL.
 442  * @user_data: user data passed to @callback.
 443  *
 444  * Ejects a drive. This is an asynchronous operation, and is
 445  * finished by calling g_drive_eject_with_operation_finish() with the @drive
 446  * and #GAsyncResult data returned in the @callback.
 447  *
 448  * Since: 2.22
 449  **/
 450 void
 451 g_drive_eject_with_operation (GDrive              *drive,
 452                               GMountUnmountFlags   flags,
 453                               GMountOperation     *mount_operation,
 454                               GCancellable        *cancellable,
 455                               GAsyncReadyCallback  callback,
 456                               gpointer             user_data)
 457 {
 458   GDriveIface *iface;
 459
 460   g_return_if_fail (G_IS_DRIVE (drive));
 461
 462   iface = G_DRIVE_GET_IFACE (drive);
 463
 464   if (iface->eject == NULL && iface->eject_with_operation == NULL)
 465     {
 466       g_task_report_new_error (drive, callback, user_data,
 467                                g_drive_eject_with_operation,
 468                                G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED,
 469                                /* Translators: This is an error
 470                                 * message for drive objects that
 471                                 * don't implement any of eject or eject_with_operation. */
 472                                _("drive doesn't implement eject or eject_with_operation"));
 473       return;
 474     }
 475
 476   if (iface->eject_with_operation != NULL)
 477     (* iface->eject_with_operation) (drive, flags, mount_operation, cancellable, callback, user_data);
 478   else
 479     (* iface->eject) (drive, flags, cancellable, callback, user_data);
 480 }
 481
 482 /**
 483  * g_drive_eject_with_operation_finish:
 484  * @drive: a #GDrive.
 485  * @result: a #GAsyncResult.
 486  * @error: a #GError location to store the error occurring, or %NULL to
 487  *     ignore.
 488  *
 489  * Finishes ejecting a drive. If any errors occurred during the operation,
 490  * @error will be set to contain the errors and %FALSE will be returned.
 491  *
 492  * Returns: %TRUE if the drive was successfully ejected. %FALSE otherwise.
 493  *
 494  * Since: 2.22
 495  **/
 496 gboolean
 497 g_drive_eject_with_operation_finish (GDrive        *drive,
 498                                      GAsyncResult  *result,
 499                                      GError       **error)
 500 {
 501   GDriveIface *iface;
 502
 503   g_return_val_if_fail (G_IS_DRIVE (drive), FALSE);
 504   g_return_val_if_fail (G_IS_ASYNC_RESULT (result), FALSE);
 505
 506   if (g_async_result_legacy_propagate_error (result, error))
 507     return FALSE;
 508   else if (g_async_result_is_tagged (result, g_drive_eject_with_operation))
 509     return g_task_propagate_boolean (G_TASK (result), error);
 510
 511   iface = G_DRIVE_GET_IFACE (drive);
 512   if (iface->eject_with_operation_finish != NULL)
 513     return (* iface->eject_with_operation_finish) (drive, result, error);
 514   else
 515     return (* iface->eject_finish) (drive, result, error);
 516 }
 517
 518 /**
 519  * g_drive_poll_for_media:
 520  * @drive: a #GDrive.
 521  * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
 522  * @callback: (allow-none): a #GAsyncReadyCallback, or %NULL.
 523  * @user_data: user data to pass to @callback
 524  *
 525  * Asynchronously polls @drive to see if media has been inserted or removed.
 526  *
 527  * When the operation is finished, @callback will be called.
 528  * You can then call g_drive_poll_for_media_finish() to obtain the
 529  * result of the operation.
 530  **/
 531 void
 532 g_drive_poll_for_media (GDrive              *drive,
 533                         GCancellable        *cancellable,
 534                         GAsyncReadyCallback  callback,
 535                         gpointer             user_data)
 536 {
 537   GDriveIface *iface;
 538
 539   g_return_if_fail (G_IS_DRIVE (drive));
 540
 541   iface = G_DRIVE_GET_IFACE (drive);
 542
 543   if (iface->poll_for_media == NULL)
 544     {
 545       g_task_report_new_error (drive, callback, user_data,
 546                                g_drive_poll_for_media,
 547                                G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED,
 548                                _("drive doesn't implement polling for media"));
 549       return;
 550     }
 551
 552   (* iface->poll_for_media) (drive, cancellable, callback, user_data);
 553 }
 554
 555 /**
 556  * g_drive_poll_for_media_finish:
 557  * @drive: a #GDrive.
 558  * @result: a #GAsyncResult.
 559  * @error: a #GError, or %NULL
 560  *
 561  * Finishes an operation started with g_drive_poll_for_media() on a drive.
 562  *
 563  * Returns: %TRUE if the drive has been poll_for_mediaed successfully,
 564  *     %FALSE otherwise.
 565  **/
 566 gboolean
 567 g_drive_poll_for_media_finish (GDrive        *drive,
 568                                GAsyncResult  *result,
 569                                GError       **error)
 570 {
 571   GDriveIface *iface;
 572
 573   g_return_val_if_fail (G_IS_DRIVE (drive), FALSE);
 574   g_return_val_if_fail (G_IS_ASYNC_RESULT (result), FALSE);
 575
 576   if (g_async_result_legacy_propagate_error (result, error))
 577     return FALSE;
 578   else if (g_async_result_is_tagged (result, g_drive_poll_for_media))
 579     return g_task_propagate_boolean (G_TASK (result), error);
 580
 581   iface = G_DRIVE_GET_IFACE (drive);
 582
 583   return (* iface->poll_for_media_finish) (drive, result, error);
 584 }
 585
 586 /**
 587  * g_drive_get_identifier:
 588  * @drive: a #GDrive
 589  * @kind: the kind of identifier to return
 590  *
 591  * Gets the identifier of the given kind for @drive.
 592  *
 593  * Returns: a newly allocated string containing the
 594  *     requested identfier, or %NULL if the #GDrive
 595  *     doesn't have this kind of identifier.
 596  */
 597 char *
 598 g_drive_get_identifier (GDrive     *drive,
 599                         const char *kind)
 600 {
 601   GDriveIface *iface;
 602
 603   g_return_val_if_fail (G_IS_DRIVE (drive), NULL);
 604   g_return_val_if_fail (kind != NULL, NULL);
 605
 606   iface = G_DRIVE_GET_IFACE (drive);
 607
 608   if (iface->get_identifier == NULL)
 609     return NULL;
 610
 611   return (* iface->get_identifier) (drive, kind);
 612 }
 613
 614 /**
 615  * g_drive_enumerate_identifiers:
 616  * @drive: a #GDrive
 617  *
 618  * Gets the kinds of identifiers that @drive has.
 619  * Use g_drive_get_identifier() to obtain the identifiers
 620  * themselves.
 621  *
 622  * Returns: (transfer full) (array zero-terminated=1): a %NULL-terminated
 623  *     array of strings containing kinds of identifiers. Use g_strfreev()
 624  *     to free.
 625  */
 626 char **
 627 g_drive_enumerate_identifiers (GDrive *drive)
 628 {
 629   GDriveIface *iface;
 630
 631   g_return_val_if_fail (G_IS_DRIVE (drive), NULL);
 632   iface = G_DRIVE_GET_IFACE (drive);
 633
 634   if (iface->enumerate_identifiers == NULL)
 635     return NULL;
 636
 637   return (* iface->enumerate_identifiers) (drive);
 638 }
 639
 640 /**
 641  * g_drive_get_start_stop_type:
 642  * @drive: a #GDrive.
 643  *
 644  * Gets a hint about how a drive can be started/stopped.
 645  *
 646  * Returns: A value from the #GDriveStartStopType enumeration.
 647  *
 648  * Since: 2.22
 649  */
 650 GDriveStartStopType
 651 g_drive_get_start_stop_type (GDrive *drive)
 652 {
 653   GDriveIface *iface;
 654
 655   g_return_val_if_fail (G_IS_DRIVE (drive), FALSE);
 656
 657   iface = G_DRIVE_GET_IFACE (drive);
 658
 659   if (iface->get_start_stop_type == NULL)
 660     return G_DRIVE_START_STOP_TYPE_UNKNOWN;
 661
 662   return (* iface->get_start_stop_type) (drive);
 663 }
 664
 665
 666 /**
 667  * g_drive_can_start:
 668  * @drive: a #GDrive.
 669  *
 670  * Checks if a drive can be started.
 671  *
 672  * Returns: %TRUE if the @drive can be started, %FALSE otherwise.
 673  *
 674  * Since: 2.22
 675  */
 676 gboolean
 677 g_drive_can_start (GDrive *drive)
 678 {
 679   GDriveIface *iface;
 680
 681   g_return_val_if_fail (G_IS_DRIVE (drive), FALSE);
 682
 683   iface = G_DRIVE_GET_IFACE (drive);
 684
 685   if (iface->can_start == NULL)
 686     return FALSE;
 687
 688   return (* iface->can_start) (drive);
 689 }
 690
 691 /**
 692  * g_drive_can_start_degraded:
 693  * @drive: a #GDrive.
 694  *
 695  * Checks if a drive can be started degraded.
 696  *
 697  * Returns: %TRUE if the @drive can be started degraded, %FALSE otherwise.
 698  *
 699  * Since: 2.22
 700  */
 701 gboolean
 702 g_drive_can_start_degraded (GDrive *drive)
 703 {
 704   GDriveIface *iface;
 705
 706   g_return_val_if_fail (G_IS_DRIVE (drive), FALSE);
 707
 708   iface = G_DRIVE_GET_IFACE (drive);
 709
 710   if (iface->can_start_degraded == NULL)
 711     return FALSE;
 712
 713   return (* iface->can_start_degraded) (drive);
 714 }
 715
 716 /**
 717  * g_drive_start:
 718  * @drive: a #GDrive.
 719  * @flags: flags affecting the start operation.
 720  * @mount_operation: (allow-none): a #GMountOperation or %NULL to avoid
 721  *     user interaction.
 722  * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
 723  * @callback: (allow-none): a #GAsyncReadyCallback, or %NULL.
 724  * @user_data: user data to pass to @callback
 725  *
 726  * Asynchronously starts a drive.
 727  *
 728  * When the operation is finished, @callback will be called.
 729  * You can then call g_drive_start_finish() to obtain the
 730  * result of the operation.
 731  *
 732  * Since: 2.22
 733  */
 734 void
 735 g_drive_start (GDrive              *drive,
 736                GDriveStartFlags     flags,
 737                GMountOperation     *mount_operation,
 738                GCancellable        *cancellable,
 739                GAsyncReadyCallback  callback,
 740                gpointer             user_data)
 741 {
 742   GDriveIface *iface;
 743
 744   g_return_if_fail (G_IS_DRIVE (drive));
 745
 746   iface = G_DRIVE_GET_IFACE (drive);
 747
 748   if (iface->start == NULL)
 749     {
 750       g_task_report_new_error (drive, callback, user_data,
 751                                g_drive_start,
 752                                G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED,
 753                                _("drive doesn't implement start"));
 754       return;
 755     }
 756
 757   (* iface->start) (drive, flags, mount_operation, cancellable, callback, user_data);
 758 }
 759
 760 /**
 761  * g_drive_start_finish:
 762  * @drive: a #GDrive.
 763  * @result: a #GAsyncResult.
 764  * @error: a #GError, or %NULL
 765  *
 766  * Finishes starting a drive.
 767  *
 768  * Returns: %TRUE if the drive has been started successfully,
 769  *     %FALSE otherwise.
 770  *
 771  * Since: 2.22
 772  */
 773 gboolean
 774 g_drive_start_finish (GDrive         *drive,
 775                       GAsyncResult   *result,
 776                       GError        **error)
 777 {
 778   GDriveIface *iface;
 779
 780   g_return_val_if_fail (G_IS_DRIVE (drive), FALSE);
 781   g_return_val_if_fail (G_IS_ASYNC_RESULT (result), FALSE);
 782
 783   if (g_async_result_legacy_propagate_error (result, error))
 784     return FALSE;
 785   else if (g_async_result_is_tagged (result, g_drive_start))
 786     return g_task_propagate_boolean (G_TASK (result), error);
 787
 788   iface = G_DRIVE_GET_IFACE (drive);
 789
 790   return (* iface->start_finish) (drive, result, error);
 791 }
 792
 793 /**
 794  * g_drive_can_stop:
 795  * @drive: a #GDrive.
 796  *
 797  * Checks if a drive can be stopped.
 798  *
 799  * Returns: %TRUE if the @drive can be stopped, %FALSE otherwise.
 800  *
 801  * Since: 2.22
 802  */
 803 gboolean
 804 g_drive_can_stop (GDrive *drive)
 805 {
 806   GDriveIface *iface;
 807
 808   g_return_val_if_fail (G_IS_DRIVE (drive), FALSE);
 809
 810   iface = G_DRIVE_GET_IFACE (drive);
 811
 812   if (iface->can_stop == NULL)
 813     return FALSE;
 814
 815   return (* iface->can_stop) (drive);
 816 }
 817
 818 /**
 819  * g_drive_stop:
 820  * @drive: a #GDrive.
 821  * @flags: flags affecting the unmount if required for stopping.
 822  * @mount_operation: (allow-none): a #GMountOperation or %NULL to avoid
 823  *     user interaction.
 824  * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
 825  * @callback: (allow-none): a #GAsyncReadyCallback, or %NULL.
 826  * @user_data: user data to pass to @callback
 827  *
 828  * Asynchronously stops a drive.
 829  *
 830  * When the operation is finished, @callback will be called.
 831  * You can then call g_drive_stop_finish() to obtain the
 832  * result of the operation.
 833  *
 834  * Since: 2.22
 835  */
 836 void
 837 g_drive_stop (GDrive               *drive,
 838               GMountUnmountFlags    flags,
 839               GMountOperation      *mount_operation,
 840               GCancellable         *cancellable,
 841               GAsyncReadyCallback   callback,
 842               gpointer              user_data)
 843 {
 844   GDriveIface *iface;
 845
 846   g_return_if_fail (G_IS_DRIVE (drive));
 847
 848   iface = G_DRIVE_GET_IFACE (drive);
 849
 850   if (iface->stop == NULL)
 851     {
 852       g_task_report_new_error (drive, callback, user_data,
 853                                g_drive_start,
 854                                G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED,
 855                                _("drive doesn't implement stop"));
 856       return;
 857     }
 858
 859   (* iface->stop) (drive, flags, mount_operation, cancellable, callback, user_data);
 860 }
 861
 862 /**
 863  * g_drive_stop_finish:
 864  * @drive: a #GDrive.
 865  * @result: a #GAsyncResult.
 866  * @error: a #GError, or %NULL
 867  *
 868  * Finishes stopping a drive.
 869  *
 870  * Returns: %TRUE if the drive has been stopped successfully,
 871  *     %FALSE otherwise.
 872  *
 873  * Since: 2.22
 874  */
 875 gboolean
 876 g_drive_stop_finish (GDrive        *drive,
 877                      GAsyncResult  *result,
 878                      GError       **error)
 879 {
 880   GDriveIface *iface;
 881
 882   g_return_val_if_fail (G_IS_DRIVE (drive), FALSE);
 883   g_return_val_if_fail (G_IS_ASYNC_RESULT (result), FALSE);
 884
 885   if (g_async_result_legacy_propagate_error (result, error))
 886     return FALSE;
 887   else if (g_async_result_is_tagged (result, g_drive_start))
 888     return g_task_propagate_boolean (G_TASK (result), error);
 889
 890   iface = G_DRIVE_GET_IFACE (drive);
 891
 892   return (* iface->stop_finish) (drive, result, error);
 893 }
 894
 895 /**
 896  * g_drive_get_sort_key:
 897  * @drive: A #GDrive.
 898  *
 899  * Gets the sort key for @drive, if any.
 900  *
 901  * Returns: Sorting key for @drive or %NULL if no such key is available.
 902  *
 903  * Since: 2.32
 904  */
 905 const gchar *
 906 g_drive_get_sort_key (GDrive  *drive)
 907 {
 908   const gchar *ret = NULL;
 909   GDriveIface *iface;
 910
 911   g_return_val_if_fail (G_IS_DRIVE (drive), NULL);
 912
 913   iface = G_DRIVE_GET_IFACE (drive);
 914   if (iface->get_sort_key != NULL)
 915     ret = iface->get_sort_key (drive);
 916
 917   return ret;
 918 }