Bug 587484 – Interaction when unmounting mounts and misc fixes

- Port everything to use _with_operation() variants of unmount/eject
   methods

 - Add support for g_file_poll_mountable()
   - new job class: GVfsJobPollMountable

 - Pass mount operation for unmount/eject ops on GDaemonFile and
   GDaemonMount
   - receive in the appropriate GVfsJob classes
   - also pass unmount flags where it was missing
   - port all backends to use this

 - Teach GMountSource and GMountOperationDBus about the new
   GMountOperation::show-processes signal
   - also provide new API
     - g_mount_source_is_dummy() - e.g. when the client didn't
       passed NULL for the GMountOperation
     - g_mount_source_abort() - to send the ::abort signal to the
       client-side GMountOperation
     - make the client-side of GMountSource return ::reply with
       NOT_HANDLED when we do an abort

 - Refactor the mount operation handling in GProxyVolumeMonitor

 - Pass mount operation for unmount/ejects in GProxyVolumeMonitor

 - Pass the process id of the actual reader/writer in OpenForRead
   and OpenForWrite daemon methods
   - add some private API for making the FUSE client set the
     pid of the POSIX client (otherwise it looks like the FUSE
     client is blocking) and pass the right pid.

     This is because the FUSE client is basically impersonating the
     POSIX processes.

 - Make the process id mentioned above available in appropriate
   GVfsJob classes
   - GVfsJobOpenForRead
   - GVfsJobOpenForWrite
   - GVfsChannel

 - Provide API to get a list of all blocking clients, e.g. an array
   of GPid
   - g_vfs_daemon_get_blocking_processes()

 - Provide convenience API to easily doing the right thing on unmount;
   e.g. interact with the user about blocking processes - see the gphoto2
   backend for example usage
   - g_vfs_backend_has_blocking_processes()
   - g_vfs_backend_unmount_with_operation() and
     g_vfs_backend_unmount_with_operation_finish()

 - Only the gphoto2 backend supports ::show-processes right now. Support
   for other backends will be added shortly.

 - Implement support for ::show-processes in the GDU volume monitor
   - right now we don't support "Unmount Anyway" since it requires
     ABI changes in libgdu.so - this will be changed as soon as there's
     a new gnome-disk-utility release

1 files changed, 89 insertions, 0 deletions

diff --git a/common/gmountoperationdbus.c b/common/gmountoperationdbus.c
index b8ac4f7d..9122042e 100644
--- a/common/gmountoperationdbus.c
+++ b/common/gmountoperationdbus.c
@@ -51,6 +51,8 @@ static void              mount_op_ask_password        (GMountOperationDBus *op_d
 						       DBusMessage         *message);
 static void              mount_op_ask_question        (GMountOperationDBus *op_dbus,
 						       DBusMessage         *message);
+static void              mount_op_show_processes      (GMountOperationDBus *op_dbus,
+						       DBusMessage         *message);
 static void              mount_op_aborted             (GMountOperationDBus *op_dbus,
 						       DBusMessage         *message);
 
@@ -135,6 +137,10 @@ mount_op_message_function (DBusConnection  *connection,
     mount_op_ask_question (op_dbus, message);
   else if (dbus_message_is_method_call (message,
 					G_VFS_DBUS_MOUNT_OPERATION_INTERFACE,
+					G_VFS_DBUS_MOUNT_OPERATION_OP_SHOW_PROCESSES))
+    mount_op_show_processes (op_dbus, message);
+  else if (dbus_message_is_method_call (message,
+					G_VFS_DBUS_MOUNT_OPERATION_INTERFACE,
 					G_VFS_DBUS_MOUNT_OPERATION_OP_ABORTED))
     mount_op_aborted (op_dbus, message);
   else
@@ -320,8 +326,91 @@ mount_op_ask_question (GMountOperationDBus *op_dbus,
 }
 
 static void
+show_processes_reply (GMountOperation *op,
+                      GMountOperationResult result,
+                      gpointer data)
+{
+  DBusMessage *reply = data;
+  guint32 choice;
+  dbus_bool_t handled, abort_dbus;
+  GMountOperationDBus *op_dbus;
+
+  op_dbus = g_object_get_data (G_OBJECT (op), "dbus-op");
+
+  handled = (result != G_MOUNT_OPERATION_UNHANDLED);
+  abort_dbus = (result == G_MOUNT_OPERATION_ABORTED);
+
+  choice = g_mount_operation_get_choice (op);
+
+  _g_dbus_message_append_args (reply,
+			       DBUS_TYPE_BOOLEAN, &handled,
+			       DBUS_TYPE_BOOLEAN, &abort_dbus,
+			       DBUS_TYPE_UINT32, &choice,
+			       0);
+
+  mount_op_send_reply (op_dbus, reply);
+}
+
+static void
+mount_op_show_processes (GMountOperationDBus *op_dbus,
+                         DBusMessage         *message)
+{
+  const char *message_string;
+  char **choices;
+  int num_choices;
+  gint32 **process_pids;
+  int num_process_pids;
+  DBusMessage *reply;
+  DBusError error;
+  DBusMessageIter iter;
+  GArray *processes;
+
+  reply = NULL;
+
+  dbus_message_iter_init (message, &iter);
+  dbus_error_init (&error);
+  if (!_g_dbus_message_iter_get_args (&iter,
+				      &error,
+				      DBUS_TYPE_STRING, &message_string,
+				      DBUS_TYPE_ARRAY, DBUS_TYPE_STRING,
+				      &choices, &num_choices,
+				      DBUS_TYPE_ARRAY, DBUS_TYPE_INT32,
+				      &process_pids, &num_process_pids,
+				      0))
+    {
+      reply = dbus_message_new_error (message, error.name, error.message);
+      if (reply == NULL)
+	_g_dbus_oom ();
+      if (!dbus_connection_send (op_dbus->connection, reply, NULL))
+	_g_dbus_oom ();
+      dbus_message_unref (reply);
+      dbus_error_free (&error);
+      return;
+    }
+
+  processes = g_array_sized_new (FALSE, FALSE, sizeof (GPid), num_process_pids);
+  g_array_append_vals (processes, process_pids, num_process_pids);
+
+  reply = dbus_message_new_method_return (message);
+  if (reply == NULL)
+    _g_dbus_oom ();
+
+  g_signal_connect (op_dbus->op, "reply", (GCallback)show_processes_reply, reply);
+
+  g_signal_emit_by_name (op_dbus->op, "show_processes",
+			 message_string,
+                         processes,
+			 choices);
+
+  dbus_free_string_array (choices);
+  g_array_unref (processes);
+}
+
+static void
 mount_op_aborted (GMountOperationDBus *op_dbus,
 		  DBusMessage         *message)
 {
+  /* also emit reply to make the all DBus ops return */
+  g_mount_operation_reply (op_dbus->op, G_MOUNT_OPERATION_UNHANDLED);
   g_signal_emit_by_name (op_dbus->op, "aborted");
 }