[PATCH 07/18] virtiofs: Stop virtiofs queues when device is being removed

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

Stop all the virt queues when device is going away. This will ensure that
no new requests are submitted to virtqueue and and request will end with
error -ENOTCONN.

Signed-off-by: Vivek Goyal <vgoyal at redhat.com>
---
 fs/fuse/virtio_fs.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/fs/fuse/virtio_fs.c b/fs/fuse/virtio_fs.c
index f68a25ca9e9d..90e7b2f345e5 100644
--- a/fs/fuse/virtio_fs.c
+++ b/fs/fuse/virtio_fs.c
@@ -493,10 +493,24 @@ static int virtio_fs_probe(struct virtio_device *vdev)
 	return ret;
 }

+static void virtio_fs_stop_all_queues(struct virtio_fs *fs)
+{
+	struct virtio_fs_vq *fsvq;
+	int i;
+
+	for (i = 0; i < fs->nvqs; i++) {
+		fsvq = &fs->vqs[i];
+		spin_lock(&fsvq->lock);
+		fsvq->connected = false;
+		spin_unlock(&fsvq->lock);
+	}
+}
+
 static void virtio_fs_remove(struct virtio_device *vdev)
 {
 	struct virtio_fs *fs = vdev->priv;

+	virtio_fs_stop_all_queues(fs);
 	vdev->config->reset(vdev);
 	virtio_fs_cleanup_vqs(vdev, fs);

--
2.20.1