9p: make rpc code common and rework flush code
This code moves the rpc function to the common client base,
reorganizes the flush code to be more simple and stable, and
makes the necessary adjustments to the underlying transports
to adapt to the new structure.
This reduces the overall amount of code duplication between the
transports and should make adding new transports more straightforward.
Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
diff --git a/net/9p/trans_virtio.c b/net/9p/trans_virtio.c
index e18de14..2d7781e 100644
--- a/net/9p/trans_virtio.c
+++ b/net/9p/trans_virtio.c
@@ -126,17 +126,16 @@
struct virtio_chan *chan = vq->vdev->priv;
struct p9_fcall *rc;
unsigned int len;
- unsigned long flags;
struct p9_req_t *req;
- spin_lock_irqsave(&chan->lock, flags);
+ P9_DPRINTK(P9_DEBUG_TRANS, ": request done\n");
+
while ((rc = chan->vq->vq_ops->get_buf(chan->vq, &len)) != NULL) {
+ P9_DPRINTK(P9_DEBUG_TRANS, ": rc %p\n", rc);
+ P9_DPRINTK(P9_DEBUG_TRANS, ": lookup tag %d\n", rc->tag);
req = p9_tag_lookup(chan->client, rc->tag);
- req->status = REQ_STATUS_RCVD;
- wake_up(req->wq);
+ p9_client_cb(chan->client, req);
}
- /* In case queue is stopped waiting for more buffers. */
- spin_unlock_irqrestore(&chan->lock, flags);
}
/**
@@ -173,8 +172,14 @@
return index-start;
}
+/* We don't currently allow canceling of virtio requests */
+static int p9_virtio_cancel(struct p9_client *client, struct p9_req_t *req)
+{
+ return 1;
+}
+
/**
- * p9_virtio_rpc - issue a request and wait for a response
+ * p9_virtio_request - issue a request
* @t: transport state
* @tc: &p9_fcall request to transmit
* @rc: &p9_fcall to put reponse into
@@ -182,44 +187,22 @@
*/
static int
-p9_virtio_rpc(struct p9_client *c, struct p9_fcall *tc, struct p9_fcall **rc)
+p9_virtio_request(struct p9_client *client, struct p9_req_t *req)
{
int in, out;
- int n, err, size;
- struct virtio_chan *chan = c->trans;
- char *rdata;
- struct p9_req_t *req;
- unsigned long flags;
+ struct virtio_chan *chan = client->trans;
+ char *rdata = (char *)req->rc+sizeof(struct p9_fcall);
- if (*rc == NULL) {
- *rc = kmalloc(sizeof(struct p9_fcall) + c->msize, GFP_KERNEL);
- if (!*rc)
- return -ENOMEM;
- }
+ P9_DPRINTK(P9_DEBUG_TRANS, "9p debug: virtio request\n");
- rdata = (char *)*rc+sizeof(struct p9_fcall);
-
- n = P9_NOTAG;
- if (tc->id != P9_TVERSION) {
- n = p9_idpool_get(c->tagpool);
- if (n < 0)
- return -ENOMEM;
- }
-
- spin_lock_irqsave(&chan->lock, flags);
- req = p9_tag_alloc(c, n);
- spin_unlock_irqrestore(&chan->lock, flags);
-
- p9_set_tag(tc, n);
-
- P9_DPRINTK(P9_DEBUG_TRANS, "9p debug: virtio rpc tag %d\n", n);
-
- out = pack_sg_list(chan->sg, 0, VIRTQUEUE_NUM, tc->sdata, tc->size);
- in = pack_sg_list(chan->sg, out, VIRTQUEUE_NUM-out, rdata, c->msize);
+ out = pack_sg_list(chan->sg, 0, VIRTQUEUE_NUM, req->tc->sdata,
+ req->tc->size);
+ in = pack_sg_list(chan->sg, out, VIRTQUEUE_NUM-out, rdata,
+ client->msize);
req->status = REQ_STATUS_SENT;
- if (chan->vq->vq_ops->add_buf(chan->vq, chan->sg, out, in, tc)) {
+ if (chan->vq->vq_ops->add_buf(chan->vq, chan->sg, out, in, req->tc)) {
P9_DPRINTK(P9_DEBUG_TRANS,
"9p debug: virtio rpc add_buf returned failure");
return -EIO;
@@ -227,28 +210,7 @@
chan->vq->vq_ops->kick(chan->vq);
- wait_event(*req->wq, req->status == REQ_STATUS_RCVD);
-
- size = le32_to_cpu(*(__le32 *) rdata);
-
- err = p9_deserialize_fcall(rdata, size, *rc, c->dotu);
- if (err < 0) {
- P9_DPRINTK(P9_DEBUG_TRANS,
- "9p debug: virtio rpc deserialize returned %d\n", err);
- return err;
- }
-
-#ifdef CONFIG_NET_9P_DEBUG
- if ((p9_debug_level&P9_DEBUG_FCALL) == P9_DEBUG_FCALL) {
- char buf[150];
-
- p9_printfcall(buf, sizeof(buf), *rc, c->dotu);
- printk(KERN_NOTICE ">>> %p %s\n", c, buf);
- }
-#endif
-
- p9_free_req(c, req);
-
+ P9_DPRINTK(P9_DEBUG_TRANS, "9p debug: virtio request kicked\n");
return 0;
}
@@ -394,7 +356,8 @@
.name = "virtio",
.create = p9_virtio_create,
.close = p9_virtio_close,
- .rpc = p9_virtio_rpc,
+ .request = p9_virtio_request,
+ .cancel = p9_virtio_cancel,
.maxsize = PAGE_SIZE*16,
.def = 0,
.owner = THIS_MODULE,