NFSD: Add nfsd4_send_cb_offload()

Refactor for legibility.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>

fs/nfsd/nfs4proc.c

@@ -1763,6 +1763,27 @@ static void cleanup_async_copy(struct nfsd4_copy *copy)
 	nfs4_put_copy(copy);
 }
 
+static void nfsd4_send_cb_offload(struct nfsd4_copy *copy)
+{
+	struct nfsd4_copy *cb_copy;
+
+	cb_copy = kzalloc(sizeof(struct nfsd4_copy), GFP_KERNEL);
+	if (!cb_copy)
+		return;
+
+	refcount_set(&cb_copy->refcount, 1);
+	memcpy(&cb_copy->cp_res, &copy->cp_res, sizeof(copy->cp_res));
+	cb_copy->cp_clp = copy->cp_clp;
+	cb_copy->nfserr = copy->nfserr;
+	memcpy(&cb_copy->fh, &copy->fh, sizeof(copy->fh));
+
+	nfsd4_init_cb(&cb_copy->cp_cb, cb_copy->cp_clp,
+			&nfsd4_cb_offload_ops, NFSPROC4_CLNT_CB_OFFLOAD);
+	trace_nfsd_cb_offload(copy->cp_clp, &copy->cp_res.cb_stateid,
+			      &copy->fh, copy->cp_count, copy->nfserr);
+	nfsd4_run_cb(&cb_copy->cp_cb);
+}
+
 /**
  * nfsd4_do_async_copy - kthread function for background server-side COPY
  * @data: arguments for COPY operation
@@ -1773,7 +1794,6 @@ static void cleanup_async_copy(struct nfsd4_copy *copy)
 static int nfsd4_do_async_copy(void *data)
 {
 	struct nfsd4_copy *copy = (struct nfsd4_copy *)data;
-	struct nfsd4_copy *cb_copy;
 
 	if (nfsd4_ssc_is_inter(copy)) {
 		struct file *filp;
@@ -1795,20 +1815,7 @@ static int nfsd4_do_async_copy(void *data)
 	}
 
 do_callback:
-	cb_copy = kzalloc(sizeof(struct nfsd4_copy), GFP_KERNEL);
-	if (!cb_copy)
-		goto out;
-	refcount_set(&cb_copy->refcount, 1);
-	memcpy(&cb_copy->cp_res, &copy->cp_res, sizeof(copy->cp_res));
-	cb_copy->cp_clp = copy->cp_clp;
-	cb_copy->nfserr = copy->nfserr;
-	memcpy(&cb_copy->fh, &copy->fh, sizeof(copy->fh));
-	nfsd4_init_cb(&cb_copy->cp_cb, cb_copy->cp_clp,
-			&nfsd4_cb_offload_ops, NFSPROC4_CLNT_CB_OFFLOAD);
-	trace_nfsd_cb_offload(copy->cp_clp, &copy->cp_res.cb_stateid,
-			      &copy->fh, copy->cp_count, copy->nfserr);
-	nfsd4_run_cb(&cb_copy->cp_cb);
-out:
+	nfsd4_send_cb_offload(copy);
 	cleanup_async_copy(copy);
 	return 0;
 }