tcm_vhost: Add ioctl to get and set events missed flag
Signed-off-by: Asias He <asias@redhat.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
diff --git a/drivers/vhost/tcm_vhost.c b/drivers/vhost/tcm_vhost.c
index 5340fd7..07217d8 100644
--- a/drivers/vhost/tcm_vhost.c
+++ b/drivers/vhost/tcm_vhost.c
@@ -1200,8 +1200,11 @@
struct vhost_scsi_target backend;
void __user *argp = (void __user *)arg;
u64 __user *featurep = argp;
+ u32 __user *eventsp = argp;
+ u32 events_missed;
u64 features;
int r, abi_version = VHOST_SCSI_ABI_VERSION;
+ struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT];
switch (ioctl) {
case VHOST_SCSI_SET_ENDPOINT:
@@ -1222,6 +1225,20 @@
if (copy_to_user(argp, &abi_version, sizeof abi_version))
return -EFAULT;
return 0;
+ case VHOST_SCSI_SET_EVENTS_MISSED:
+ if (get_user(events_missed, eventsp))
+ return -EFAULT;
+ mutex_lock(&vq->mutex);
+ vs->vs_events_missed = events_missed;
+ mutex_unlock(&vq->mutex);
+ return 0;
+ case VHOST_SCSI_GET_EVENTS_MISSED:
+ mutex_lock(&vq->mutex);
+ events_missed = vs->vs_events_missed;
+ mutex_unlock(&vq->mutex);
+ if (put_user(events_missed, eventsp))
+ return -EFAULT;
+ return 0;
case VHOST_GET_FEATURES:
features = VHOST_SCSI_FEATURES;
if (copy_to_user(featurep, &features, sizeof features))