void aio_wait_kick(AioWait *wait)
{
/* The barrier (or an atomic op) is in the caller. */
if (atomic_read(&wait->need_kick)) {
aio_bh_schedule_oneshot(qemu_get_aio_context(), dummy_bh_cb, NULL);
}
}
void iothread_stop(IOThread *iothread)
{
if (!iothread->ctx || iothread->stopping) {
return;
}
iothread->stopping = true;
aio_bh_schedule_oneshot(iothread->ctx, iothread_stop_bh, iothread);
qemu_thread_join(&iothread->thread);
}
/*
* This is the callback function for rbd_aio_read and _write
*
* Note: this function is being called from a non qemu thread so
* we need to be careful about what we do here. Generally we only
* schedule a BH, and do the rest of the io completion handling
* from rbd_finish_bh() which runs in a qemu context.
*/
static void rbd_finish_aiocb(rbd_completion_t c, RADOSCB *rcb)
{
RBDAIOCB *acb = rcb->acb;
rcb->ret = rbd_aio_get_return_value(c);
rbd_aio_release(c);
aio_bh_schedule_oneshot(bdrv_get_aio_context(acb->common.bs),
rbd_finish_bh, rcb);
}
static void net_vhost_user_event(void *opaque, int event)
{
const char *name = opaque;
NetClientState *ncs[MAX_QUEUE_NUM];
VhostUserState *s;
Chardev *chr;
Error *err = NULL;
int queues;
queues = qemu_find_net_clients_except(name, ncs,
NET_CLIENT_DRIVER_NIC,
MAX_QUEUE_NUM);
assert(queues < MAX_QUEUE_NUM);
s = DO_UPCAST(VhostUserState, nc, ncs[0]);
chr = qemu_chr_fe_get_driver(&s->chr);
trace_vhost_user_event(chr->label, event);
switch (event) {
case CHR_EVENT_OPENED:
if (vhost_user_start(queues, ncs, &s->chr) < 0) {
qemu_chr_fe_disconnect(&s->chr);
return;
}
s->watch = qemu_chr_fe_add_watch(&s->chr, G_IO_HUP,
net_vhost_user_watch, s);
qmp_set_link(name, true, &err);
s->started = true;
break;
case CHR_EVENT_CLOSED:
/* a close event may happen during a read/write, but vhost
* code assumes the vhost_dev remains setup, so delay the
* stop & clear to idle.
* FIXME: better handle failure in vhost code, remove bh
*/
if (s->watch) {
AioContext *ctx = qemu_get_current_aio_context();
g_source_remove(s->watch);
s->watch = 0;
qemu_chr_fe_set_handlers(&s->chr, NULL, NULL, NULL, NULL,
NULL, NULL, false);
aio_bh_schedule_oneshot(ctx, chr_closed_bh, opaque);
}
break;
}
if (err) {
error_report_err(err);
}
}
/*
* Called from a libqnio thread
*/
static void vxhs_iio_callback(void *ctx, uint32_t opcode, uint32_t error)
{
VXHSAIOCB *acb = NULL;
switch (opcode) {
case IRP_READ_REQUEST:
case IRP_WRITE_REQUEST:
/*
* ctx is VXHSAIOCB*
* ctx is NULL if error is QNIOERROR_CHANNEL_HUP
*/
if (ctx) {
acb = ctx;
} else {
trace_vxhs_iio_callback(error);
goto out;
}
if (error) {
if (!acb->err) {
acb->err = error;
}
trace_vxhs_iio_callback(error);
}
aio_bh_schedule_oneshot(bdrv_get_aio_context(acb->common.bs),
vxhs_complete_aio_bh, acb);
break;
default:
if (error == QNIOERROR_HUP) {
/*
* Channel failed, spontaneous notification,
* not in response to I/O
*/
trace_vxhs_iio_callback_chnfail(error, errno);
} else {
trace_vxhs_iio_callback_unknwn(opcode, error);
}
break;
}
out:
return;
}