migration/fd.c

   1 /*
   2  * QEMU live migration via generic fd
   3  *
   4  * Copyright Red Hat, Inc. 2009-2016
   5  *
   6  * Authors:
   7  *  Chris Lalancette <clalance@redhat.com>
   8  *  Daniel P. Berrange <berrange@redhat.com>
   9  *
  10  * This work is licensed under the terms of the GNU GPL, version 2.  See
  11  * the COPYING file in the top-level directory.
  12  *
  13  * Contributions after 2012-01-13 are licensed under the terms of the
  14  * GNU GPL, version 2 or (at your option) any later version.
  15  */
  16
  17 #include "qemu/osdep.h"
  18 #include "channel.h"
  19 #include "fd.h"
  20 #include "file.h"
  21 #include "migration.h"
  22 #include "monitor/monitor.h"
  23 #include "qemu/error-report.h"
  24 #include "qemu/sockets.h"
  25 #include "io/channel-util.h"
  26 #include "trace.h"
  27
  28
  29 void fd_start_outgoing_migration(MigrationState *s, const char *fdname, Error **errp)
  30 {
  31     QIOChannel *ioc;
  32     int fd = monitor_get_fd(monitor_cur(), fdname, errp);
  33     if (fd == -1) {
  34         return;
  35     }
  36
  37     if (!fd_is_socket(fd)) {
  38         warn_report("fd: migration to a file is deprecated."
  39                     " Use file: instead.");
  40     }
  41
  42     trace_migration_fd_outgoing(fd);
  43     ioc = qio_channel_new_fd(fd, errp);
  44     if (!ioc) {
  45         close(fd);
  46         return;
  47     }
  48
  49     qio_channel_set_name(ioc, "migration-fd-outgoing");
  50     migration_channel_connect(s, ioc, NULL, NULL);
  51     object_unref(OBJECT(ioc));
  52 }
  53
  54 static gboolean fd_accept_incoming_migration(QIOChannel *ioc,
  55                                              GIOCondition condition,
  56                                              gpointer opaque)
  57 {
  58     migration_channel_process_incoming(ioc);
  59     object_unref(OBJECT(ioc));
  60     return G_SOURCE_REMOVE;
  61 }
  62
  63 void fd_start_incoming_migration(const char *fdname, Error **errp)
  64 {
  65     QIOChannel *ioc;
  66     int fd = monitor_fd_param(monitor_cur(), fdname, errp);
  67     if (fd == -1) {
  68         return;
  69     }
  70
  71     if (!fd_is_socket(fd)) {
  72         warn_report("fd: migration to a file is deprecated."
  73                     " Use file: instead.");
  74     }
  75
  76     trace_migration_fd_incoming(fd);
  77
  78     ioc = qio_channel_new_fd(fd, errp);
  79     if (!ioc) {
  80         close(fd);
  81         return;
  82     }
  83
  84     qio_channel_set_name(ioc, "migration-fd-incoming");
  85     qio_channel_add_watch_full(ioc, G_IO_IN,
  86                                fd_accept_incoming_migration,
  87                                NULL, NULL,
  88                                g_main_context_get_thread_default());
  89 }