xprtrdma: Add mechanism to place MRs back on the free list

[linux.git] / net / sunrpc / xprtrdma / frwr_ops.c

diff --git a/net/sunrpc/xprtrdma/frwr_ops.c b/net/sunrpc/xprtrdma/frwr_ops.c
index 5c480bc1307587cad3ff92d7bd1791693a766801..524cac0a071563844962c8b139b4ff5fb29e6f8b 100644 (file)
--- a/net/sunrpc/xprtrdma/frwr_ops.c
+++ b/net/sunrpc/xprtrdma/frwr_ops.c
@@ -144,6 +144,26 @@ frwr_mr_recycle_worker(struct work_struct *work)
        frwr_release_mr(mr);
 }
 
+/* frwr_reset - Place MRs back on the free list
+ * @req: request to reset
+ *
+ * Used after a failed marshal. For FRWR, this means the MRs
+ * don't have to be fully released and recreated.
+ *
+ * NB: This is safe only as long as none of @req's MRs are
+ * involved with an ongoing asynchronous FAST_REG or LOCAL_INV
+ * Work Request.
+ */
+void frwr_reset(struct rpcrdma_req *req)
+{
+       while (!list_empty(&req->rl_registered)) {
+               struct rpcrdma_mr *mr;
+
+               mr = rpcrdma_mr_pop(&req->rl_registered);
+               rpcrdma_mr_unmap_and_put(mr);
+       }
+}
+
 /**
  * frwr_init_mr - Initialize one MR
  * @ia: interface adapter