9p: apply common request code to trans_fd

Apply the now common p9_req_t structure to the fd transport.
Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>

include/net/9p/client.h

@@ -49,11 +49,12 @@ enum p9_trans_status {
  * enum p9_req_status_t - virtio request status
  * @REQ_STATUS_IDLE: request slot unused
  * @REQ_STATUS_ALLOC: request has been allocated but not sent
+ * @REQ_STATUS_UNSENT: request waiting to be sent
  * @REQ_STATUS_SENT: request sent to server
  * @REQ_STATUS_FLSH: a flush has been sent for this request
  * @REQ_STATUS_RCVD: response received from server
  * @REQ_STATUS_FLSHD: request has been flushed
- * @REQ_STATUS_ERR: request encountered an error on the client side
+ * @REQ_STATUS_ERROR: request encountered an error on the client side
  *
  * The @REQ_STATUS_IDLE state is used to mark a request slot as unused
  * but use is actually tracked by the idpool structure which handles tag
@@ -64,6 +65,7 @@ enum p9_trans_status {
 enum p9_req_status_t {
 	REQ_STATUS_IDLE,
 	REQ_STATUS_ALLOC,
+	REQ_STATUS_UNSENT,
 	REQ_STATUS_SENT,
 	REQ_STATUS_FLSH,
 	REQ_STATUS_RCVD,
@@ -79,6 +81,8 @@ enum p9_req_status_t {
  * @tc: the request fcall structure
  * @rc: the response fcall structure
  * @aux: transport specific data (provided for trans_fd migration)
+ * @tag: tag on request (BUG: redundant)
+ * @req_list: link for higher level objects to chain requests
  *
  * Transport use an array to track outstanding requests
  * instead of a list.  While this may incurr overhead during initial
@@ -99,6 +103,9 @@ struct p9_req_t {
 	struct p9_fcall *rc;
 	u16 flush_tag;
 	void *aux;
+
+	int tag;
+	struct list_head req_list;
 };
 
 /**
@@ -207,5 +214,6 @@ struct p9_stat *p9_client_dirread(struct p9_fid *fid, u64 offset);
 
 struct p9_req_t *p9_tag_alloc(struct p9_client *, u16);
 struct p9_req_t *p9_tag_lookup(struct p9_client *, u16);
+void p9_free_req(struct p9_client *, struct p9_req_t *);
 
 #endif /* NET_9P_CLIENT_H */

net/9p/client.c

@@ -268,6 +268,27 @@ static void p9_tag_cleanup(struct p9_client *c)
 	c->max_tag = 0;
 }
 
+/**
+ * p9_free_req - free a request and clean-up as necessary
+ * c: client state
+ * r: request to release
+ *
+ */
+
+void p9_free_req(struct p9_client *c, struct p9_req_t *r)
+{
+	r->flush_tag = P9_NOTAG;
+	r->status = REQ_STATUS_IDLE;
+	if (r->tc->tag != P9_NOTAG && p9_idpool_check(r->tc->tag, c->tagpool))
+		p9_idpool_put(r->tc->tag, c->tagpool);
+
+	/* if this was a flush request we have to free response fcall */
+	if (r->tc->id == P9_TFLUSH) {
+		kfree(r->tc);
+		kfree(r->rc);
+	}
+}
+
 static struct p9_fid *p9_fid_create(struct p9_client *clnt)
 {
 	int err;

net/9p/trans_virtio.c

@@ -247,10 +247,7 @@ p9_virtio_rpc(struct p9_client *c, struct p9_fcall *tc, struct p9_fcall **rc)
 	}
 #endif
 
-	if (n != P9_NOTAG && p9_idpool_check(n, c->tagpool))
-		p9_idpool_put(n, c->tagpool);
-
-	req->status = REQ_STATUS_IDLE;
+	p9_free_req(c, req);
 
 	return 0;
 }