1 files changed, 113 insertions, 0 deletions
diff --git a/xlators/cluster/nsr-client/src/fop-template.c b/xlators/cluster/nsr-client/src/fop-template.c
new file mode 100644
index 000000000..699b07d40
--- /dev/null
+++ b/xlators/cluster/nsr-client/src/fop-template.c
@@ -0,0 +1,113 @@
+// template-name fop
+$TYPE$
+nsrc_$NAME$ (call_frame_t *frame, xlator_t *this,
+             $ARGS_LONG$)
+{
+        nsrc_local_t    *local          = NULL;
+        xlator_t        *target_xl      = ACTIVE_CHILD(this);
+
+        local = mem_get(this->local_pool);
+        if (!local) {
+                goto err;
+        }
+
+        local->stub = fop_$NAME$_stub (frame, nsrc_$NAME$_continue,
+                                       $ARGS_SHORT$);
+        if (!local->stub) {
+                goto err;
+        }
+        local->curr_xl = target_xl;
+        local->scars = 0;
+
+        frame->local = local;
+        STACK_WIND_COOKIE (frame, nsrc_$NAME$_cbk, target_xl,
+                    target_xl, target_xl->fops->$NAME$,
+                    $ARGS_SHORT$);
+        return 0;
+
+err:
+        if (local) {
+                mem_put(local);
+        }
+        STACK_UNWIND_STRICT ($NAME$, frame, -1, ENOMEM,
+                             $DEFAULTS$);
+        return 0;
+}
+
+// template-name cbk
+$TYPE$
+nsrc_$NAME$_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+                 int32_t op_ret, int32_t op_errno,
+                 $ARGS_LONG$)
+{
+        nsrc_local_t    *local          = frame->local;
+        xlator_t        *last_xl        = cookie;
+        xlator_t        *next_xl;
+        nsrc_private_t  *priv           = this->private;
+        struct timespec spec;
+
+        if (op_ret != (-1)) {
+                if (local->scars) {
+                        gf_log (this->name, GF_LOG_INFO,
+                                HILITE("retried %p OK"), frame->local);
+                }
+                priv->active = last_xl;
+                goto unwind;
+        }
+        if ((op_errno != EREMOTE) && (op_errno != ENOTCONN)) {
+                goto unwind;
+        }
+
+        /* TBD: get leader ID from xdata? */
+        next_xl = next_xlator(this,last_xl);
+        /*
+         * We can't just give up after we've tried all bricks, because it's
+         * quite likely that a new leader election just hasn't finished yet.
+         * We also shouldn't retry endlessly, and especially not at a high
+         * rate, but that's good enough while we work on other things.
+         * 
+         * TBD: implement slow/finite retry via a worker thread
+         */
+        if (!next_xl || (local->scars >= SCAR_LIMIT)) {
+                gf_log (this->name, GF_LOG_DEBUG,
+                        HILITE("ran out of retries for %p"), frame->local);
+                goto unwind;
+        }
+
+        local->curr_xl = next_xl;
+        local->scars += 1;
+        spec.tv_sec = 1;
+        spec.tv_nsec = 0;
+        /*
+         * WARNING
+         *
+         * Just calling gf_timer_call_after like this leaves open the
+         * possibility that writes will get reordered, if a first write is
+         * rescheduled and then a second comes along to find an updated
+         * priv->active before the first actually executes.  We might need to
+         * implement a stricter (and more complicated) queuing mechanism to
+         * ensure absolute consistency in this case.
+         */
+        if (gf_timer_call_after(this->ctx,spec,nsrc_retry_cb,local)) {
+                return 0;
+        }
+
+unwind:
+        call_stub_destroy(local->stub);
+        STACK_UNWIND_STRICT ($NAME$, frame, op_ret, op_errno,
+                                     $ARGS_SHORT$);
+        return 0;
+}
+
+// template-name cont-func
+$TYPE$
+nsrc_$NAME$_continue (call_frame_t *frame, xlator_t *this,
+                      $ARGS_LONG$)
+{
+        nsrc_local_t    *local  = frame->local;
+
+        STACK_WIND_COOKIE (frame, nsrc_$NAME$_cbk, local->curr_xl,
+                           local->curr_xl, local->curr_xl->fops->$NAME$,
+                           $ARGS_SHORT$);
+        return 0;
+}