drbd: Minimal struct drbd_tconn

Starting to dissolve the network connection from the actual
block devices.
Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>

drivers/block/drbd/drbd_int.h

@@ -94,6 +94,7 @@ extern char usermode_helper[];
 #define UUID_NEW_BM_OFFSET ((u64)0x0001000000000000ULL)
 
 struct drbd_conf;
+struct drbd_tconn;
 
 
 /* to shorten dev_warn(DEV, "msg"); and relatives statements */
@@ -960,7 +961,18 @@ struct fifo_buffer {
 	unsigned int size;
 };
 
+struct drbd_tconn {			/* is a resource from the config file */
+	char *name;			/* Resource name */
+	struct list_head all_tconn;	/* List of all drbd_tconn, prot by global_state_lock */
+	struct drbd_conf *volume0;	/* TODO: Remove me again */
+
+	struct net_conf *net_conf;	/* protected by get_net_conf() and put_net_conf() */
+};
+
 struct drbd_conf {
+	struct drbd_tconn *tconn;
+	int vnr;			/* volume number within the connection */
+
 	/* things that are stored as / read from meta data on disk */
 	unsigned long flags;
 
@@ -1496,6 +1508,9 @@ extern rwlock_t global_state_lock;
 extern struct drbd_conf *drbd_new_device(unsigned int minor);
 extern void drbd_free_mdev(struct drbd_conf *mdev);
 
+struct drbd_tconn *drbd_new_tconn(char *name);
+extern void drbd_free_tconn(struct drbd_tconn *tconn);
+
 extern int proc_details;
 
 /* drbd_req */

drivers/block/drbd/drbd_main.c

@@ -132,6 +132,7 @@ module_param_string(usermode_helper, usermode_helper, sizeof(usermode_helper), 0
  * as member "struct gendisk *vdisk;"
  */
 struct drbd_conf **minor_table;
+struct list_head drbd_tconns;  /* list of struct drbd_tconn */
 
 struct kmem_cache *drbd_request_cache;
 struct kmem_cache *drbd_ee_cache;	/* epoch entries */
@@ -3267,6 +3268,7 @@ static void drbd_delete_device(unsigned int minor)
 		bdput(mdev->this_bdev);
 
 	drbd_free_resources(mdev);
+	drbd_free_tconn(mdev->tconn);
 
 	drbd_release_ee_lists(mdev);
 
@@ -3358,6 +3360,41 @@ static int drbd_congested(void *congested_data, int bdi_bits)
 	return r;
 }
 
+struct drbd_tconn *drbd_new_tconn(char *name)
+{
+	struct drbd_tconn *tconn;
+
+	tconn = kzalloc(sizeof(struct drbd_tconn), GFP_KERNEL);
+	if (!tconn)
+		return NULL;
+
+	tconn->name = kstrdup(name, GFP_KERNEL);
+	if (!tconn->name)
+		goto fail;
+
+	write_lock_irq(&global_state_lock);
+	list_add(&tconn->all_tconn, &drbd_tconns);
+	write_unlock_irq(&global_state_lock);
+
+	return tconn;
+
+fail:
+	kfree(tconn->name);
+	kfree(tconn);
+
+	return NULL;
+}
+
+void drbd_free_tconn(struct drbd_tconn *tconn)
+{
+	write_lock_irq(&global_state_lock);
+	list_del(&tconn->all_tconn);
+	write_unlock_irq(&global_state_lock);
+
+	kfree(tconn->name);
+	kfree(tconn);
+}
+
 struct drbd_conf *drbd_new_device(unsigned int minor)
 {
 	struct drbd_conf *mdev;
@@ -3368,9 +3405,14 @@ struct drbd_conf *drbd_new_device(unsigned int minor)
 	mdev = kzalloc(sizeof(struct drbd_conf), GFP_KERNEL);
 	if (!mdev)
 		return NULL;
+	mdev->tconn = drbd_new_tconn("dummy");
+	if (!mdev->tconn)
+		goto out_no_tconn;
+
 	if (!zalloc_cpumask_var(&mdev->cpu_mask, GFP_KERNEL))
 		goto out_no_cpumask;
 
+	mdev->tconn->volume0 = mdev;
 	mdev->minor = minor;
 
 	drbd_init_set_defaults(mdev);
@@ -3447,6 +3489,8 @@ struct drbd_conf *drbd_new_device(unsigned int minor)
 out_no_q:
 	free_cpumask_var(mdev->cpu_mask);
 out_no_cpumask:
+	drbd_free_tconn(mdev->tconn);
+out_no_tconn:
 	kfree(mdev);
 	return NULL;
 }
@@ -3526,6 +3570,7 @@ int __init drbd_init(void)
 	}
 
 	rwlock_init(&global_state_lock);
+	INIT_LIST_HEAD(&drbd_tconns);
 
 	printk(KERN_INFO "drbd: initialized. "
 	       "Version: " REL_VERSION " (api:%d/proto:%d-%d)\n",