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>

1 files changed, 45 insertions, 0 deletions

diff --git a/drivers/block/drbd/drbd_main.c b/drivers/block/drbd/drbd_main.c
index 2902f6dd7bf1..a6ac0c81406b 100644
--- a/drivers/block/drbd/drbd_main.c
+++ b/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 @@ out:
         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 @@ out_no_disk:
 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",