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

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Message-Id: <20190905194859.16219-8-vgoyal@redhat.com>
Date:   Thu,  5 Sep 2019 15:48:48 -0400
From:   Vivek Goyal <vgoyal@...hat.com>
To:     linux-fsdevel@...r.kernel.org,
        virtualization@...ts.linux-foundation.org, miklos@...redi.hu
Cc:     linux-kernel@...r.kernel.org, virtio-fs@...hat.com,
        vgoyal@...hat.com, stefanha@...hat.com, dgilbert@...hat.com,
        mst@...hat.com
Subject: [PATCH 07/18] virtiofs: Stop virtiofs queues when device is being removed

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@...hat.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