udiskslinuxpartitiontable.c

/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*-
 *
 * Copyright (C) 2007-2010 David Zeuthen <zeuthen@gmail.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 */

#include "config.h"
#include <glib/gi18n-lib.h>

#include <sys/types.h>
#include <pwd.h>
#include <grp.h>
#include <string.h>
#include <stdlib.h>
#include <fcntl.h>
#include <sys/file.h>

#include <glib/gstdio.h>

#include <blockdev/part.h>
#include <blockdev/fs.h>

#include "udiskslogging.h"
#include "udiskslinuxpartitiontable.h"
#include "udiskslinuxblockobject.h"
#include "udisksdaemon.h"
#include "udisksdaemonutil.h"
#include "udiskslinuxdevice.h"
#include "udiskslinuxblock.h"
#include "udiskslinuxpartition.h"
#include "udiskssimplejob.h"

/**
 * SECTION:udiskslinuxpartitiontable
 * @title: UDisksLinuxPartitionTable
 * @short_description: Linux implementation of #UDisksPartitionTable
 *
 * This type provides an implementation of the #UDisksPartitionTable
 * interface on Linux.
 */

typedef struct _UDisksLinuxPartitionTableClass   UDisksLinuxPartitionTableClass;

/**
 * UDisksLinuxPartitionTable:
 *
 * The #UDisksLinuxPartitionTable structure contains only private data and should
 * only be accessed using the provided API.
 */
struct _UDisksLinuxPartitionTable
{
  UDisksPartitionTableSkeleton parent_instance;
};

struct _UDisksLinuxPartitionTableClass
{
  UDisksPartitionTableSkeletonClass parent_class;
};

static void partition_table_iface_init (UDisksPartitionTableIface *iface);

G_DEFINE_TYPE_WITH_CODE (UDisksLinuxPartitionTable, udisks_linux_partition_table, UDISKS_TYPE_PARTITION_TABLE_SKELETON,
                         G_IMPLEMENT_INTERFACE (UDISKS_TYPE_PARTITION_TABLE, partition_table_iface_init));

/* ---------------------------------------------------------------------------------------------------- */

static void
udisks_linux_partition_table_init (UDisksLinuxPartitionTable *partition_table)
{
  g_dbus_interface_skeleton_set_flags (G_DBUS_INTERFACE_SKELETON (partition_table),
                                       G_DBUS_INTERFACE_SKELETON_FLAGS_HANDLE_METHOD_INVOCATIONS_IN_THREAD);
}

static void
udisks_linux_partition_table_class_init (UDisksLinuxPartitionTableClass *klass)
{
}

/**
 * udisks_linux_partition_table_new:
 *
 * Creates a new #UDisksLinuxPartitionTable instance.
 *
 * Returns: A new #UDisksLinuxPartitionTable. Free with g_object_unref().
 */
UDisksPartitionTable *
udisks_linux_partition_table_new (void)
{
  return UDISKS_PARTITION_TABLE (g_object_new (UDISKS_TYPE_LINUX_PARTITION_TABLE,
                                               NULL));
}

/* ---------------------------------------------------------------------------------------------------- */

/**
 * udisks_linux_partition_table_update:
 * @table: A #UDisksLinuxPartitionTable.
 * @object: The enclosing #UDisksLinuxBlockObject instance.
 *
 * Updates the interface.
 */
void
udisks_linux_partition_table_update (UDisksLinuxPartitionTable  *table,
                                     UDisksLinuxBlockObject     *object)
{
  UDisksLinuxDevice *device = NULL;
  UDisksDaemon *daemon = NULL;
  guint num_parts = 0;
  const gchar **partition_object_paths = NULL;
  const gchar *part_type = NULL;
  GList *partition_objects = NULL;
  GList *object_p = NULL;
  guint i = 0;
  const gchar *device_file;
  BDPartDiskSpec *spec;
  GError *error = NULL;

  /* update list of partitions */
  daemon = udisks_linux_block_object_get_daemon (UDISKS_LINUX_BLOCK_OBJECT (object));

  partition_objects = udisks_linux_partition_table_get_partitions (daemon, UDISKS_PARTITION_TABLE (table), &num_parts);

  partition_object_paths = g_new0 (const gchar *, num_parts + 1);
  for (i = 0, object_p = partition_objects; object_p != NULL; object_p = object_p->next, i++)
    {
      partition_object_paths[i] = g_dbus_object_get_object_path (g_dbus_interface_get_object (G_DBUS_INTERFACE (object_p->data)));
    }

  udisks_partition_table_set_partitions (UDISKS_PARTITION_TABLE (table),
                                         partition_object_paths);

  /* update partition table type */
  device = udisks_linux_block_object_get_device (object);
  if (device)
    {
      part_type = g_udev_device_get_property (device->udev_device, "ID_PART_TABLE_TYPE");
      if (!part_type && num_parts > 0)
        {
          /* probe the device in case no cached udev property is available */
          device_file = g_udev_device_get_device_file (device->udev_device);
          if (device_file)
            {
              spec = bd_part_get_disk_spec (device_file, &error);
              if (spec)
                {
                  part_type = bd_part_get_part_table_type_str (spec->table_type, NULL);
                  bd_part_disk_spec_free (spec);
                }
              else
                {
                  udisks_warning ("Partitions found on device '%s' but couldn't read partition table signature: %s",
                                  device_file, error->message);
                  g_clear_error (&error);
                }
            }
        }
    }
  udisks_partition_table_set_type_ (UDISKS_PARTITION_TABLE (table), part_type);

  g_dbus_interface_skeleton_flush (G_DBUS_INTERFACE_SKELETON (table));

  g_free (partition_object_paths);
  g_clear_object (&device);
  g_list_free_full (partition_objects, g_object_unref);
}

/* ---------------------------------------------------------------------------------------------------- */

GList *
udisks_linux_partition_table_get_partitions (UDisksDaemon         *daemon,
                                             UDisksPartitionTable *table,
                                             guint                *num_partitions)
{
  GList *ret = NULL;
  GDBusObject *table_object;
  const gchar *table_object_path;
  GList *l, *object_proxies = NULL;
  *num_partitions = 0;

  table_object = g_dbus_interface_get_object (G_DBUS_INTERFACE (table));
  if (table_object == NULL)
    goto out;
  table_object_path = g_dbus_object_get_object_path (table_object);

  object_proxies = udisks_daemon_get_objects (daemon);
  for (l = object_proxies; l != NULL; l = l->next)
    {
      UDisksObject *object = UDISKS_OBJECT (l->data);
      UDisksPartition *partition;

      partition = udisks_object_get_partition (object);
      if (partition == NULL)
        continue;

      if (g_strcmp0 (udisks_partition_get_table (partition), table_object_path) == 0)
        {
          ret = g_list_prepend (ret, g_object_ref (partition));
          (*num_partitions)++;
        }

      g_object_unref (partition);
    }
  ret = g_list_reverse (ret);
 out:
  g_list_free_full (object_proxies, g_object_unref);
  return ret;
}

/* ---------------------------------------------------------------------------------------------------- */

typedef struct
{
  UDisksObject *partition_table_object;
  guint64       pos_to_wait_for;
  gboolean      ignore_container;
} WaitForPartitionData;

static UDisksObject *
wait_for_partition (UDisksDaemon *daemon,
                    gpointer      user_data)
{
  WaitForPartitionData *data = user_data;
  UDisksObject *ret = NULL;
  GList *objects, *l;

  objects = udisks_daemon_get_objects (daemon);
  for (l = objects; l != NULL; l = l->next)
    {
      UDisksObject *object = UDISKS_OBJECT (l->data);
      UDisksPartition *partition = udisks_object_get_partition (object);
      if (partition != NULL)
        {
          if (g_strcmp0 (udisks_partition_get_table (partition),
                         g_dbus_object_get_object_path (G_DBUS_OBJECT (data->partition_table_object))) == 0)
            {
              guint64 offset = udisks_partition_get_offset (partition);
              guint64 size = udisks_partition_get_size (partition);

              if (data->pos_to_wait_for >= offset && data->pos_to_wait_for < offset + size)
                {
                  if (!(udisks_partition_get_is_container (partition) && data->ignore_container))
                    {
                      g_object_unref (partition);
                      ret = g_object_ref (object);
                      goto out;
                    }
                }
            }
          g_object_unref (partition);
        }
    }

 out:
  g_list_free_full (objects, g_object_unref);
  return ret;
}

#define MIB_SIZE (1048576L)

static UDisksObject *
udisks_linux_partition_table_handle_create_partition (UDisksPartitionTable   *table,
                                                      GDBusMethodInvocation  *invocation,
                                                      guint64                 offset,
                                                      guint64                 size,
                                                      const gchar            *type,
                                                      const gchar            *name,
                                                      GVariant               *options)
{
  const gchar *action_id = NULL;
  const gchar *message = NULL;
  UDisksBlock *block = NULL;
  UDisksObject *object = NULL;
  UDisksDaemon *daemon = NULL;
  gchar *device_name = NULL;
  WaitForPartitionData *wait_data = NULL;
  UDisksObject *partition_object = NULL;
  UDisksBlock *partition_block = NULL;
  BDPartSpec *part_spec = NULL;
  BDPartSpec *overlapping_part = NULL;
  BDPartTypeReq part_type = 0;
  gchar *table_type = NULL;
  uid_t caller_uid;
  GError *error = NULL;
  UDisksBaseJob *job = NULL;
  const gchar *partition_type = NULL;
  const gchar *partition_uuid = NULL;

  object = udisks_daemon_util_dup_object (table, &error);
  if (object == NULL)
    {
      g_dbus_method_invocation_return_gerror (invocation, error);
      goto out;
    }

  daemon = udisks_linux_block_object_get_daemon (UDISKS_LINUX_BLOCK_OBJECT (object));

  g_variant_lookup (options, "partition-type", "&s", &partition_type);
  g_variant_lookup (options, "partition-uuid", "&s", &partition_uuid);

  block = udisks_object_get_block (object);
  if (block == NULL)
    {
      g_dbus_method_invocation_return_error (invocation, UDISKS_ERROR, UDISKS_ERROR_FAILED,
                                             "Partition table object is not a block device");
      goto out;
    }

  if (!udisks_daemon_util_get_caller_uid_sync (daemon,
                                               invocation,
                                               NULL /* GCancellable */,
                                               &caller_uid,
                                               &error))
    {
      g_dbus_method_invocation_return_gerror (invocation, error);
      goto out;
    }

  action_id = "org.freedesktop.udisks2.modify-device";
  /* Translators: Shown in authentication dialog when the user
   * requests creating a new partition.
   *
   * Do not translate $(drive), it's a placeholder and
   * will be replaced by the name of the drive/device in question
   */
  message = N_("Authentication is required to create a partition on $(drive)");
  if (!udisks_daemon_util_setup_by_user (daemon, object, caller_uid))
    {
      if (udisks_block_get_hint_system (block))
        {
          action_id = "org.freedesktop.udisks2.modify-device-system";
        }
      else if (!udisks_daemon_util_on_user_seat (daemon, object, caller_uid))
        {
          action_id = "org.freedesktop.udisks2.modify-device-other-seat";
        }
    }

  if (!udisks_daemon_util_check_authorization_sync (daemon,
                                                    object,
                                                    action_id,
                                                    options,
                                                    message,
                                                    invocation))
    goto out;

  device_name = g_strdup (udisks_block_get_device (block));

  table_type = udisks_partition_table_dup_type_ (table);
  wait_data = g_new0 (WaitForPartitionData, 1);
  if (g_strcmp0 (table_type, "dos") == 0)
    {
      char *endp;
      gint type_as_int;

      if (strlen (name) > 0)
        {
          g_dbus_method_invocation_return_error (invocation, UDISKS_ERROR, UDISKS_ERROR_FAILED,
                                                 "MBR partition table does not support names");
          goto out;
        }

      type_as_int = strtol (type, &endp, 0);

      /* Determine whether we are creating a primary, extended or logical partition */
      if (partition_type != NULL)
        {
          if (g_strcmp0 (partition_type, "primary") == 0)
            {
              part_type = BD_PART_TYPE_REQ_NORMAL;
            }
          else if (g_strcmp0 (partition_type, "extended") == 0)
            {
              part_type = BD_PART_TYPE_REQ_EXTENDED;
            }
          else if (g_strcmp0 (partition_type, "logical") == 0)
            {
              part_type = BD_PART_TYPE_REQ_LOGICAL;
            }
          else
            {
              g_dbus_method_invocation_return_error (invocation, UDISKS_ERROR, UDISKS_ERROR_FAILED,
                                                     "Don't know how to create partition of type `%s'",
                                                     partition_type);
              goto out;
            }
        }
      else if (type[0] != '\0' && *endp == '\0' &&
               (type_as_int == 0x05 || type_as_int == 0x0f || type_as_int == 0x85))
        {
          part_type = BD_PART_TYPE_REQ_EXTENDED;
        }
      else
        part_type = BD_PART_TYPE_REQ_NEXT;
    }
  else if (g_strcmp0 (table_type, "gpt") == 0)
    {
      part_type = BD_PART_TYPE_REQ_NORMAL;
    }
  else
    {
      g_dbus_method_invocation_return_error (invocation, UDISKS_ERROR, UDISKS_ERROR_FAILED,
                                             "Don't know how to create partitions this partition table of type `%s'",
                                             table_type);
      goto out;
    }

  job = udisks_daemon_launch_simple_job (daemon,
                                         UDISKS_OBJECT (object),
                                         "partition-create",
                                         caller_uid,
                                         NULL);

  if (job == NULL)
    {
      g_dbus_method_invocation_return_error (invocation, UDISKS_ERROR, UDISKS_ERROR_FAILED,
                                             "Failed to create a job object");
      goto out;
    }

  /* Users might want to specify logical partitions start and size using size of
   * of the extended partition. If this happens we need to shift start (offset)
   * of the logical partition.
   * XXX: We really shouldn't allow creation of overlapping partitions and
   *      and just automatically fix this. But udisks currently doesn't have
   *      functions to get free regions on the disks so this is a somewhat valid
   *      use case. But we should definitely provide some functionality to get
   *      right "numbers" and stop doing this.
  */
  overlapping_part = bd_part_get_part_by_pos (device_name, offset, &error);
  if (overlapping_part != NULL && ! (overlapping_part->type & BD_PART_TYPE_FREESPACE))
    {
      /* extended partition or metadata of the extended partition */
      if (overlapping_part->type & BD_PART_TYPE_EXTENDED || overlapping_part->type & (BD_PART_TYPE_LOGICAL | BD_PART_TYPE_METADATA))
        {
          if (overlapping_part->start == offset)
            {
              /* just add 1 byte, libblockdev will adjust it */
              offset += 1;
              udisks_warning ("Requested start of the logical partition overlaps "
                              "with extended partition metadata. Start of the "
                              "partition moved to %"G_GUINT64_FORMAT".", offset);
            }
        }
      else
        {
          /* overlapping partition is not a free space nor an extended part -> error */
          g_dbus_method_invocation_return_error (invocation, UDISKS_ERROR, UDISKS_ERROR_FAILED,
                                                 "Requested start for the new partition %"G_GUINT64_FORMAT" "
                                                 "overlaps with existing partition %s.",
                                                  offset, overlapping_part->path);
          goto out;
        }
    }
  else
    g_clear_error (&error);

  part_spec = bd_part_create_part (device_name, part_type, offset,
                                   size, BD_PART_ALIGN_OPTIMAL, &error);
  if (!part_spec)
    {
      g_dbus_method_invocation_return_error (invocation,
                                             UDISKS_ERROR,
                                             UDISKS_ERROR_FAILED,
                                             "Error creating partition on %s: %s",
                                             udisks_block_get_device (block),
                                             error->message);
      udisks_simple_job_complete (UDISKS_SIMPLE_JOB (job), FALSE, error->message);
      goto out;
    }

  /* set name and UUID if given */
  if (g_strcmp0 (table_type, "gpt") == 0)
    {
      if (strlen (name) > 0)
        {
          if (!bd_part_set_part_name (device_name, part_spec->path, name, &error))
            {
              g_prefix_error (&error, "Error setting name for newly created partition: ");
              g_dbus_method_invocation_return_gerror (invocation, error);
              udisks_simple_job_complete (UDISKS_SIMPLE_JOB (job), FALSE, error->message);
              goto out;
            }
        }
      else if (partition_uuid)
        {
          if (!bd_part_set_part_uuid (device_name, part_spec->path, partition_uuid, &error))
            {
              g_prefix_error (&error, "Error setting partition UUID for newly created partition: ");
              g_dbus_method_invocation_return_gerror (invocation, error);
              udisks_simple_job_complete (UDISKS_SIMPLE_JOB (job), FALSE, error->message);
              goto out;
            }
        }
    }

  /* set type if given and if not extended partition */
  if (part_spec->type != BD_PART_TYPE_EXTENDED && strlen (type) > 0)
    {
      gboolean ret = FALSE;

      if (g_strcmp0 (table_type, "gpt") == 0)
          ret = bd_part_set_part_type (device_name, part_spec->path, type, &error);
      else if (g_strcmp0 (table_type, "dos") == 0)
          ret = bd_part_set_part_id (device_name, part_spec->path, type, &error);

      if (!ret)
        {
          g_prefix_error (&error, "Error setting type for newly created partition: ");
          g_dbus_method_invocation_return_gerror (invocation, error);
          udisks_simple_job_complete (UDISKS_SIMPLE_JOB (job), FALSE, error->message);
          goto out;
        }
    }

  /* wipe the newly created partition if wanted */
  if (part_spec->type != BD_PART_TYPE_EXTENDED)
    {
      if (!bd_fs_wipe (part_spec->path, TRUE, FALSE, &error))
        {
          if (g_error_matches (error, BD_FS_ERROR, BD_FS_ERROR_NOFS))
            g_clear_error (&error);
          else
            {
              g_dbus_method_invocation_return_error (invocation,
                                                     UDISKS_ERROR,
                                                     UDISKS_ERROR_FAILED,
                                                     "Error wiping newly created partition %s: %s",
                                                     part_spec->path,
                                                     error->message);
              udisks_simple_job_complete (UDISKS_SIMPLE_JOB (job), FALSE, error->message);
              goto out;
            }
        }
    }

  wait_data->ignore_container = (part_spec->type == BD_PART_TYPE_LOGICAL);
  wait_data->pos_to_wait_for = part_spec->start + (part_spec->size / 2L);

  /* sit and wait for the partition to show up */
  g_warn_if_fail (wait_data->pos_to_wait_for > 0);
  wait_data->partition_table_object = object;
  partition_object = udisks_daemon_wait_for_object_sync (daemon,
                                                         wait_for_partition,
                                                         wait_data,
                                                         NULL,
                                                         UDISKS_DEFAULT_WAIT_TIMEOUT,
                                                         &error);
  if (partition_object == NULL)
    {
      g_prefix_error (&error, "Error waiting for partition to appear: ");
      g_dbus_method_invocation_return_gerror (invocation, error);
      udisks_simple_job_complete (UDISKS_SIMPLE_JOB (job), FALSE, error->message);
      goto out;
    }
  partition_block = udisks_object_get_block (partition_object);
  if (partition_block == NULL)
    {
      g_dbus_method_invocation_return_error (invocation, UDISKS_ERROR, UDISKS_ERROR_FAILED,
                                             "Partition object is not a block device");
      g_clear_object (&partition_object);
      udisks_simple_job_complete (UDISKS_SIMPLE_JOB (job), FALSE, NULL);
      goto out;
    }

  /* Trigger uevent on the disk -- we sometimes get add-remove-add uevents for
     the new partition without getting change event for the disks after the
     last add event and this breaks the "Partitions" property on the
     "PartitionTable" interface. */
  udisks_linux_block_object_trigger_uevent_sync (UDISKS_LINUX_BLOCK_OBJECT (object),
                                                 UDISKS_DEFAULT_WAIT_TIMEOUT);

  udisks_simple_job_complete (UDISKS_SIMPLE_JOB (job), TRUE, NULL);

 out:
  g_free (table_type);
  g_free (wait_data);
  g_clear_error (&error);
  g_clear_object (&partition_block);
  g_free (device_name);
  g_clear_object (&object);
  g_clear_object (&block);
  if (part_spec)
    bd_part_spec_free (part_spec);
  if (overlapping_part)
    bd_part_spec_free (overlapping_part);
  return partition_object;
}

static int
flock_block_dev (UDisksPartitionTable *iface)
{
  UDisksObject *object = udisks_daemon_util_dup_object (iface, NULL);
  UDisksBlock *block = object? udisks_object_peek_block (object) : NULL;
  int fd = block? open (udisks_block_get_device (block), O_RDONLY) : -1;

  if (fd >= 0)
    flock (fd, LOCK_SH | LOCK_NB);

  g_clear_object (&object);
  return fd;
}

static void
unflock_block_dev (int fd)
{
  if (fd >= 0)
    close (fd);
}

/* runs in thread dedicated to handling @invocation */
static gboolean
handle_create_partition (UDisksPartitionTable   *table,
                         GDBusMethodInvocation  *invocation,
                         guint64                 offset,
                         guint64                 size,
                         const gchar            *type,
                         const gchar            *name,
                         GVariant               *options)
{
  /* We (try to) take a shared lock on the partition table while
     creating and formatting a new partition, here and also in
     handle_create_partition_and_format.

     This lock prevents udevd from issuing a BLKRRPART ioctl call.
     That ioctl is undesired because it might temporarily remove the
     block device of the newly created block device.  It does so only
     temporarily, but it still happens that the block device is
     missing exactly when wipefs or mkfs try to access it.

     Also, a pair of remove/add events will cause udisks to create a
     new internal UDisksObject to represent the block device of the
     partition.  The code currently doesn't handle this and waits for
     changes (such as an expected filesystem type or UUID) to a
     obsolete internal object that will never see them.
  */

  int fd = flock_block_dev (table);
  UDisksObject *partition_object =
    udisks_linux_partition_table_handle_create_partition (table,
                                                          invocation,
                                                          offset,
                                                          size,
                                                          type,
                                                          name,
                                                          options);

  if (partition_object)
    {
      udisks_partition_table_complete_create_partition
        (table, invocation, g_dbus_object_get_object_path (G_DBUS_OBJECT (partition_object)));
      g_object_unref (partition_object);
    }

  unflock_block_dev (fd);

  return TRUE; /* returning TRUE means that we handled the method invocation */
}

/* runs in thread dedicated to handling @invocation */
struct FormatCompleteData {
  UDisksPartitionTable *table;
  GDBusMethodInvocation *invocation;
  UDisksObject *partition_object;
  int lock_fd;
};

static void
handle_format_complete (gpointer user_data)
{
  struct FormatCompleteData *data = user_data;
  udisks_partition_table_complete_create_partition
    (data->table, data->invocation, g_dbus_object_get_object_path (G_DBUS_OBJECT (data->partition_object)));
  unflock_block_dev (data->lock_fd);
}

static gboolean
handle_create_partition_and_format (UDisksPartitionTable   *table,
                                    GDBusMethodInvocation  *invocation,
                                    guint64                 offset,
                                    guint64                 size,
                                    const gchar            *type,
                                    const gchar            *name,
                                    GVariant               *options,
                                    const gchar            *format_type,
                                    GVariant               *format_options)
{
  /* See handle_create_partition for a motivation of taking the lock.
   */

  int fd = flock_block_dev (table);
  UDisksObject *partition_object =
    udisks_linux_partition_table_handle_create_partition (table,
                                                          invocation,
                                                          offset,
                                                          size,
                                                          type,
                                                          name,
                                                          options);

  if (partition_object)
    {
      struct FormatCompleteData data;
      data.table = table;
      data.invocation = invocation;
      data.partition_object = partition_object;
      data.lock_fd = fd;
      udisks_linux_block_handle_format (udisks_object_peek_block (partition_object),
                                        invocation,
                                        format_type,
                                        format_options,
                                        handle_format_complete, &data);
      g_object_unref (partition_object);
    }
  else
    unflock_block_dev (fd);

  return TRUE; /* returning TRUE means that we handled the method invocation */
}

/* ---------------------------------------------------------------------------------------------------- */

static void
partition_table_iface_init (UDisksPartitionTableIface *iface)
{
  iface->handle_create_partition = handle_create_partition;
  iface->handle_create_partition_and_format = handle_create_partition_and_format;
}