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migration: disallow migrate_add_blocker during migration

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If a migration is already in progress and somebody attempts
to add a migration blocker, this should rightly fail.

Add an errp parameter and a retcode return value to migrate_add_blocker.

Signed-off-by: John Snow <jsnow@redhat.com>
Signed-off-by: Ashijeet Acharya <ashijeetacharya@gmail.com>
Message-Id: <1484566314-3987-5-git-send-email-ashijeetacharya@gmail.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Acked-by: Greg Kurz <groug@kaod.org>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
  Merged with recent 'Allow invtsc migration' change
This commit is contained in:
Ashijeet Acharya 2017-01-16 17:01:53 +05:30 • committed by Dr. David Alan Gilbert
parent a3a3d8c738
commit fe44dc9180
18 changed files with 222 additions and 81 deletions
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19
block/vvfat.c
View file

@ -1185,21 +1185,26 @@ static int vvfat_open(BlockDriverState *bs, QDict *options, int flags,
s->sector_count = s->faked_sectors + s->sectors_per_cluster*s->cluster_count;
if (s->first_sectors_number == 0x40) {
init_mbr(s, cyls, heads, secs);
}
qemu_co_mutex_init(&s->lock);
/* Disable migration when vvfat is used rw */
if (s->qcow) {
error_setg(&s->migration_blocker,
"The vvfat (rw) format used by node '%s' "
"does not support live migration",
bdrv_get_device_or_node_name(bs));
migrate_add_blocker(s->migration_blocker);
ret = migrate_add_blocker(s->migration_blocker, &local_err);
if (local_err) {
error_propagate(errp, local_err);
error_free(s->migration_blocker);
goto fail;
}
}
if (s->first_sectors_number == 0x40) {
init_mbr(s, cyls, heads, secs);
}
qemu_co_mutex_init(&s->lock);
ret = 0;
fail:
qemu_opts_del(opts);