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virtio-scsi-dataplane: Add op blocker

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We need this to protect dataplane thread from race conditions with block
jobs until the latter is made dataplane-safe.

Signed-off-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Fam Zheng 2014-10-19 12:47:42 +08:00 • committed by Paolo Bonzini
parent e40830afa1
commit 3e2b2a9c49
3 changed files with 22 additions and 2 deletions
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4
hw/scsi/virtio-scsi-dataplane.c
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@ -155,6 +155,8 @@ void virtio_scsi_dataplane_start(VirtIOSCSI *s)
s->dataplane_starting = true;
assert(!s->blocker);
error_setg(&s->blocker, "block device is in use by data plane");
/* Set up guest notifier (irq) */
rc = k->set_guest_notifiers(qbus->parent, vs->conf.num_queues + 2, true);
if (rc != 0) {
@ -195,6 +197,8 @@ void virtio_scsi_dataplane_stop(VirtIOSCSI *s)
if (!s->dataplane_started || s->dataplane_stopping) {
return;
}
error_free(s->blocker);
s->blocker = NULL;
s->dataplane_stopping = true;
assert(s->ctx == iothread_get_aio_context(vs->conf.iothread));