unsigned int num_request_queues; /* number of request queues */
};
-struct virtio_fs_forget {
+struct virtio_fs_forget_req {
struct fuse_in_header ih;
struct fuse_forget_in arg;
+};
+
+struct virtio_fs_forget {
/* This request can be temporarily queued on virt queue */
struct list_head list;
+ struct virtio_fs_forget_req req;
};
static int virtio_fs_enqueue_req(struct virtio_fs_vq *fsvq,
}
}
+/*
+ * Returns 1 if queue is full and sender should wait a bit before sending
+ * next request, 0 otherwise.
+ */
+static int send_forget_request(struct virtio_fs_vq *fsvq,
+ struct virtio_fs_forget *forget,
+ bool in_flight)
+{
+ struct scatterlist sg;
+ struct virtqueue *vq;
+ int ret = 0;
+ bool notify;
+ struct virtio_fs_forget_req *req = &forget->req;
+
+ spin_lock(&fsvq->lock);
+ if (!fsvq->connected) {
+ if (in_flight)
+ dec_in_flight_req(fsvq);
+ kfree(forget);
+ goto out;
+ }
+
+ sg_init_one(&sg, req, sizeof(*req));
+ vq = fsvq->vq;
+ dev_dbg(&vq->vdev->dev, "%s\n", __func__);
+
+ ret = virtqueue_add_outbuf(vq, &sg, 1, forget, GFP_ATOMIC);
+ if (ret < 0) {
+ if (ret == -ENOMEM || ret == -ENOSPC) {
+ pr_debug("virtio-fs: Could not queue FORGET: err=%d. Will try later\n",
+ ret);
+ list_add_tail(&forget->list, &fsvq->queued_reqs);
+ schedule_delayed_work(&fsvq->dispatch_work,
+ msecs_to_jiffies(1));
+ if (!in_flight)
+ inc_in_flight_req(fsvq);
+ /* Queue is full */
+ ret = 1;
+ } else {
+ pr_debug("virtio-fs: Could not queue FORGET: err=%d. Dropping it.\n",
+ ret);
+ kfree(forget);
+ if (in_flight)
+ dec_in_flight_req(fsvq);
+ }
+ goto out;
+ }
+
+ if (!in_flight)
+ inc_in_flight_req(fsvq);
+ notify = virtqueue_kick_prepare(vq);
+ spin_unlock(&fsvq->lock);
+
+ if (notify)
+ virtqueue_notify(vq);
+ return ret;
+out:
+ spin_unlock(&fsvq->lock);
+ return ret;
+}
+
static void virtio_fs_hiprio_dispatch_work(struct work_struct *work)
{
struct virtio_fs_forget *forget;
struct virtio_fs_vq *fsvq = container_of(work, struct virtio_fs_vq,
dispatch_work.work);
- struct virtqueue *vq = fsvq->vq;
- struct scatterlist sg;
- struct scatterlist *sgs[] = {&sg};
- bool notify;
- int ret;
-
pr_debug("virtio-fs: worker %s called.\n", __func__);
while (1) {
spin_lock(&fsvq->lock);
}
list_del(&forget->list);
- if (!fsvq->connected) {
- dec_in_flight_req(fsvq);
- spin_unlock(&fsvq->lock);
- kfree(forget);
- continue;
- }
-
- sg_init_one(&sg, forget, sizeof(*forget));
-
- /* Enqueue the request */
- dev_dbg(&vq->vdev->dev, "%s\n", __func__);
- ret = virtqueue_add_sgs(vq, sgs, 1, 0, forget, GFP_ATOMIC);
- if (ret < 0) {
- if (ret == -ENOMEM || ret == -ENOSPC) {
- pr_debug("virtio-fs: Could not queue FORGET: err=%d. Will try later\n",
- ret);
- list_add_tail(&forget->list,
- &fsvq->queued_reqs);
- schedule_delayed_work(&fsvq->dispatch_work,
- msecs_to_jiffies(1));
- } else {
- pr_debug("virtio-fs: Could not queue FORGET: err=%d. Dropping it.\n",
- ret);
- dec_in_flight_req(fsvq);
- kfree(forget);
- }
- spin_unlock(&fsvq->lock);
- return;
- }
-
- notify = virtqueue_kick_prepare(vq);
spin_unlock(&fsvq->lock);
-
- if (notify)
- virtqueue_notify(vq);
- pr_debug("virtio-fs: worker %s dispatched one forget request.\n",
- __func__);
+ if (send_forget_request(fsvq, forget, true))
+ return;
}
}
}
#endif /* CONFIG_PM_SLEEP */
-const static struct virtio_device_id id_table[] = {
+static const struct virtio_device_id id_table[] = {
{ VIRTIO_ID_FS, VIRTIO_DEV_ANY_ID },
{},
};
-const static unsigned int feature_table[] = {};
+static const unsigned int feature_table[] = {};
static struct virtio_driver virtio_fs_driver = {
.driver.name = KBUILD_MODNAME,
{
struct fuse_forget_link *link;
struct virtio_fs_forget *forget;
- struct scatterlist sg;
- struct scatterlist *sgs[] = {&sg};
+ struct virtio_fs_forget_req *req;
struct virtio_fs *fs;
- struct virtqueue *vq;
struct virtio_fs_vq *fsvq;
- bool notify;
u64 unique;
- int ret;
link = fuse_dequeue_forget(fiq, 1, NULL);
unique = fuse_get_unique(fiq);
/* Allocate a buffer for the request */
forget = kmalloc(sizeof(*forget), GFP_NOFS | __GFP_NOFAIL);
+ req = &forget->req;
- forget->ih = (struct fuse_in_header){
+ req->ih = (struct fuse_in_header){
.opcode = FUSE_FORGET,
.nodeid = link->forget_one.nodeid,
.unique = unique,
- .len = sizeof(*forget),
+ .len = sizeof(*req),
};
- forget->arg = (struct fuse_forget_in){
+ req->arg = (struct fuse_forget_in){
.nlookup = link->forget_one.nlookup,
};
- sg_init_one(&sg, forget, sizeof(*forget));
-
- /* Enqueue the request */
- spin_lock(&fsvq->lock);
-
- if (!fsvq->connected) {
- kfree(forget);
- spin_unlock(&fsvq->lock);
- goto out;
- }
-
- vq = fsvq->vq;
- dev_dbg(&vq->vdev->dev, "%s\n", __func__);
-
- ret = virtqueue_add_sgs(vq, sgs, 1, 0, forget, GFP_ATOMIC);
- if (ret < 0) {
- if (ret == -ENOMEM || ret == -ENOSPC) {
- pr_debug("virtio-fs: Could not queue FORGET: err=%d. Will try later.\n",
- ret);
- list_add_tail(&forget->list, &fsvq->queued_reqs);
- schedule_delayed_work(&fsvq->dispatch_work,
- msecs_to_jiffies(1));
- inc_in_flight_req(fsvq);
- } else {
- pr_debug("virtio-fs: Could not queue FORGET: err=%d. Dropping it.\n",
- ret);
- kfree(forget);
- }
- spin_unlock(&fsvq->lock);
- goto out;
- }
-
- inc_in_flight_req(fsvq);
- notify = virtqueue_kick_prepare(vq);
-
- spin_unlock(&fsvq->lock);
-
- if (notify)
- virtqueue_notify(vq);
-out:
+ send_forget_request(fsvq, forget, false);
kfree(link);
}
}
}
-const static struct fuse_iqueue_ops virtio_fs_fiq_ops = {
+static const struct fuse_iqueue_ops virtio_fs_fiq_ops = {
.wake_forget_and_unlock = virtio_fs_wake_forget_and_unlock,
.wake_interrupt_and_unlock = virtio_fs_wake_interrupt_and_unlock,
.wake_pending_and_unlock = virtio_fs_wake_pending_and_unlock,
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