svcrdma: Use standard Linux lists for context cache

Replace the one-off linked list implementation used to implement the
context cache with the standard Linux list_head lists. Add a context
counter to catch resource leaks. A WARN_ON will be added later to
ensure that we've freed all contexts.

Signed-off-by: Tom Tucker <tom@opengridcomputing.com>

1 files changed, 3 insertions, 2 deletions

diff --git a/include/linux/sunrpc/svc_rdma.h b/include/linux/sunrpc/svc_rdma.h
index c447c417b37b..701439064d21 100644
--- a/include/linux/sunrpc/svc_rdma.h
+++ b/include/linux/sunrpc/svc_rdma.h
@@ -72,7 +72,7 @@ extern atomic_t rdma_stat_sq_prod;
  */
 struct svc_rdma_op_ctxt {
         struct svc_rdma_op_ctxt *read_hdr;
-        struct svc_rdma_op_ctxt *next;
+        struct list_head free_list;
         struct xdr_buf arg;
         struct list_head dto_q;
         enum ib_wr_opcode wr_op;
@@ -104,7 +104,8 @@ struct svcxprt_rdma {
 
         struct ib_pd         *sc_pd;
 
-        struct svc_rdma_op_ctxt  *sc_ctxt_head;
+        atomic_t             sc_ctxt_used;
+        struct list_head     sc_ctxt_free;
         int                  sc_ctxt_cnt;
         int                  sc_ctxt_bump;
         int                  sc_ctxt_max;