[PATCH 04/18] virtiofs: Check connected state for VQ_REQUEST queue as well

Vivek Goyal
2019-09-05T19:48:45Z

Right now we are checking ->connected state only for VQ_HIPRIO. Now we want
to make use of this method for all queues. So check it for VQ_REQUEST as
well.

This will be helpful if device has been removed and virtqueue is gone. In
that case ->connected will be false and request can't be submitted
anymore
and user space will see error -ENOTCONN.

Signed-off-by: Vivek Goyal <vgoyal at redhat.com>
---
 fs/fuse/virtio_fs.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/fs/fuse/virtio_fs.c b/fs/fuse/virtio_fs.c
index 9d30530e3ca9..c46dd4d284d6 100644
--- a/fs/fuse/virtio_fs.c
+++ b/fs/fuse/virtio_fs.c
@@ -755,6 +755,12 @@ static int virtio_fs_enqueue_req(struct virtio_fs_vq *fsvq,

 	spin_lock(&fsvq->lock);

+	if (!fsvq->connected) {
+		spin_unlock(&fsvq->lock);
+		ret = -ENOTCONN;
+		goto out;
+	}
+
 	vq = fsvq->vq;
 	ret = virtqueue_add_sgs(vq, sgs, out_sgs, in_sgs, req, GFP_ATOMIC);
 	if (ret < 0) {
--
2.20.1