On Thu, Apr 25, 2013 at 11:10:06AM +0800, Asias He wrote:
> Signed-off-by: Asias He <[email protected]>
Please merge with patch 2 so we can use feature flag to
know whether ioctl is supported.
> ---
> drivers/vhost/tcm_vhost.c | 17 +++++++++++++++++
> drivers/vhost/tcm_vhost.h | 3 +++
> 2 files changed, 20 insertions(+)
>
> diff --git a/drivers/vhost/tcm_vhost.c b/drivers/vhost/tcm_vhost.c
> index 137ae34..9c01d2a 100644
> --- a/drivers/vhost/tcm_vhost.c
> +++ b/drivers/vhost/tcm_vhost.c
> @@ -1202,8 +1202,11 @@ static long vhost_scsi_ioctl(struct file *f, unsigned
> int ioctl,
> 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:
> @@ -1224,6 +1227,20 @@ static long vhost_scsi_ioctl(struct file *f, unsigned
> int ioctl,
> 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))
> diff --git a/drivers/vhost/tcm_vhost.h b/drivers/vhost/tcm_vhost.h
> index a545a5b..514b9fd 100644
> --- a/drivers/vhost/tcm_vhost.h
> +++ b/drivers/vhost/tcm_vhost.h
> @@ -123,3 +123,6 @@ struct vhost_scsi_target {
> #define VHOST_SCSI_CLEAR_ENDPOINT _IOW(VHOST_VIRTIO, 0x41, struct
> vhost_scsi_target)
> /* Changing this breaks userspace. */
> #define VHOST_SCSI_GET_ABI_VERSION _IOW(VHOST_VIRTIO, 0x42, int)
> +/* Set and get the events missed flag */
> +#define VHOST_SCSI_SET_EVENTS_MISSED _IOW(VHOST_VIRTIO, 0x43, __u32)
> +#define VHOST_SCSI_GET_EVENTS_MISSED _IOW(VHOST_VIRTIO, 0x44, __u32)
> --
> 1.8.1.4
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