commit e6ef8a5cb3fcf5e5529a26d2cab5bd891c7964b1
author Andreas Gruenbacher <agruen@linbit.com> Thu Mar 24 18:07:54 2011 +0100
committer Philipp Reisner <philipp.reisner@linbit.com> Thu Nov 08 16:44:53 2012 +0100
tree b55ef141a5e7a6720156131da5f46b5d0cab9980
parent cb703454a283d8dd5599e928eeea30367ca18874

drbd: Preallocate one page per drbd_socket as a receive buffer

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>

drivers/block/drbd/drbd_main.c

diff --git a/drivers/block/drbd/drbd_main.c b/drivers/block/drbd/drbd_main.c
index dbe5c63..004a8ce 100644
--- a/drivers/block/drbd/drbd_main.c
+++ b/drivers/block/drbd/drbd_main.c
@@ -2272,6 +2272,19 @@
 	return tconn;
 }
 
+static int drbd_alloc_socket(struct drbd_socket *socket)
+{
+	socket->rbuf = (void *) __get_free_page(GFP_KERNEL);
+	if (!socket->rbuf)
+		return -ENOMEM;
+	return 0;
+}
+
+static void drbd_free_socket(struct drbd_socket *socket)
+{
+	free_page((unsigned long) socket->rbuf);
+}
+
 struct drbd_tconn *drbd_new_tconn(const char *name)
 {
 	struct drbd_tconn *tconn;
@@ -2284,6 +2297,11 @@
 	if (!tconn->name)
 		goto fail;
 
+	if (drbd_alloc_socket(&tconn->data))
+		goto fail;
+	if (drbd_alloc_socket(&tconn->meta))
+		goto fail;
+
 	if (!zalloc_cpumask_var(&tconn->cpu_mask, GFP_KERNEL))
 		goto fail;
 
@@ -2322,6 +2340,8 @@
 fail:
 	tl_cleanup(tconn);
 	free_cpumask_var(tconn->cpu_mask);
+	drbd_free_socket(&tconn->meta);
+	drbd_free_socket(&tconn->data);
 	kfree(tconn->name);
 	kfree(tconn);
 
@@ -2334,6 +2354,8 @@
 	idr_destroy(&tconn->volumes);
 
 	free_cpumask_var(tconn->cpu_mask);
+	drbd_free_socket(&tconn->meta);
+	drbd_free_socket(&tconn->data);
 	kfree(tconn->name);
 	kfree(tconn->int_dig_out);
 	kfree(tconn->int_dig_in);