[PATCH] virtio_fs: Remove request addition to processing list

[lirongqing]

From: Li RongQing <lirongq...@baidu.com>

Since virtio_fs does not utilize the fuse_pqueue->processing list, we
can safely omit adding requests to this list. This change eliminates the
associated spin_lock operations, thereby improving performance.

Signed-off-by: Li RongQing <lirongq...@baidu.com>
---
 fs/fuse/virtio_fs.c | 10 +---------
 1 file changed, 1 insertion(+), 9 deletions(-)

diff --git a/fs/fuse/virtio_fs.c b/fs/fuse/virtio_fs.c
index 82afe78..7a598ea5 100644
--- a/fs/fuse/virtio_fs.c
+++ b/fs/fuse/virtio_fs.c
@@ -814,7 +814,6 @@ static void virtio_fs_requests_done_work(struct work_struct 
*work)
 {
        struct virtio_fs_vq *fsvq = container_of(work, struct virtio_fs_vq,
                                                 done_work);
-       struct fuse_pqueue *fpq = &fsvq->fud->pq;
        struct virtqueue *vq = fsvq->vq;
        struct fuse_req *req;
        struct fuse_req *next;
@@ -827,9 +826,7 @@ static void virtio_fs_requests_done_work(struct work_struct 
*work)
                virtqueue_disable_cb(vq);
 
                while ((req = virtqueue_get_buf(vq, &len)) != NULL) {
-                       spin_lock(&fpq->lock);
-                       list_move_tail(&req->list, &reqs);
-                       spin_unlock(&fpq->lock);
+                       list_add_tail(&req->list, &reqs);
                }
        } while (!virtqueue_enable_cb(vq));
        spin_unlock(&fsvq->lock);
@@ -1389,7 +1386,6 @@ static int virtio_fs_enqueue_req(struct virtio_fs_vq 
*fsvq,
        unsigned int i;
        int ret;
        bool notify;
-       struct fuse_pqueue *fpq;
 
        /* Does the sglist fit on the stack? */
        total_sgs = sg_count_fuse_req(req);
@@ -1445,10 +1441,6 @@ static int virtio_fs_enqueue_req(struct virtio_fs_vq 
*fsvq,
        }
 
        /* Request successfully sent. */
-       fpq = &fsvq->fud->pq;
-       spin_lock(&fpq->lock);
-       list_add_tail(&req->list, fpq->processing);
-       spin_unlock(&fpq->lock);
        set_bit(FR_SENT, &req->flags);
        /* matches barrier in request_wait_answer() */
        smp_mb__after_atomic();
-- 
2.9.4