linux-kernel - [PATCH 05/18] Maintain count of in flight requests for VQ

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Message-Id: <20190905194859.16219-6-vgoyal@redhat.com>
Date:   Thu,  5 Sep 2019 15:48:46 -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 05/18] Maintain count of in flight requests for VQ_REQUEST queue

As of now we maintain this count only for VQ_HIPRIO. Maintain it for
VQ_REQUEST as well so that later it can be used to drain VQ_REQUEST
queue.

Signed-off-by: Vivek Goyal <vgoyal@...hat.com>
---
 fs/fuse/virtio_fs.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/fs/fuse/virtio_fs.c b/fs/fuse/virtio_fs.c
index c46dd4d284d6..5df97dfee37d 100644
--- a/fs/fuse/virtio_fs.c
+++ b/fs/fuse/virtio_fs.c
@@ -360,6 +360,9 @@ static void virtio_fs_requests_done_work(struct work_struct *work)
 		spin_unlock(&fpq->lock);
 
 		fuse_request_end(fc, req);
+		spin_lock(&fsvq->lock);
+		fsvq->in_flight--;
+		spin_unlock(&fsvq->lock);
 	}
 }
 
@@ -769,6 +772,7 @@ static int virtio_fs_enqueue_req(struct virtio_fs_vq *fsvq,
 		goto out;
 	}
 
+	fsvq->in_flight++;
 	notify = virtqueue_kick_prepare(vq);
 
 	spin_unlock(&fsvq->lock);
-- 
2.20.1