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Subject[PATCH 01/12] drbd: Refcounting for mdev objects
Date
Preparing removal of drbd_cfg_rwsem

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
---
drivers/block/drbd/drbd_int.h | 3 ++-
drivers/block/drbd/drbd_main.c | 27 +++++++++++++++++----------
drivers/block/drbd/drbd_nl.c | 8 ++++++--
drivers/block/drbd/drbd_receiver.c | 12 ++++++------
4 files changed, 31 insertions(+), 19 deletions(-)
diff --git a/drivers/block/drbd/drbd_int.h b/drivers/block/drbd/drbd_int.h
index 3f377e2..8bc604e 100644
--- a/drivers/block/drbd/drbd_int.h
+++ b/drivers/block/drbd/drbd_int.h
@@ -867,6 +867,7 @@ struct drbd_tconn { /* is a resource from the config file */
struct drbd_conf {
struct drbd_tconn *tconn;
int vnr; /* volume number within the connection */
+ struct kref kref;

/* things that are stored as / read from meta data on disk */
unsigned long flags;
@@ -1373,7 +1374,7 @@ extern rwlock_t global_state_lock;

extern int conn_lowest_minor(struct drbd_tconn *tconn);
enum drbd_ret_code conn_new_minor(struct drbd_tconn *tconn, unsigned int minor, int vnr);
-extern void drbd_delete_device(struct drbd_conf *mdev);
+extern void drbd_minor_destroy(struct kref *kref);

struct drbd_tconn *conn_create(const char *name);
extern void conn_destroy(struct kref *kref);
diff --git a/drivers/block/drbd/drbd_main.c b/drivers/block/drbd/drbd_main.c
index 3560581..9e4c487 100644
--- a/drivers/block/drbd/drbd_main.c
+++ b/drivers/block/drbd/drbd_main.c
@@ -2052,7 +2052,6 @@ void drbd_init_set_defaults(struct drbd_conf *mdev)
init_waitqueue_head(&mdev->al_wait);
init_waitqueue_head(&mdev->seq_wait);

- /* mdev->tconn->agreed_pro_version gets initialized in drbd_connect() */
mdev->write_ordering = WO_bdev_flush;
mdev->resync_wenr = LC_FREE;
mdev->peer_max_bio_size = DRBD_MAX_BIO_SIZE_SAFE;
@@ -2272,21 +2271,16 @@ static void drbd_release_all_peer_reqs(struct drbd_conf *mdev)
}

/* caution. no locking. */
-void drbd_delete_device(struct drbd_conf *mdev)
+void drbd_minor_destroy(struct kref *kref)
{
+ struct drbd_conf *mdev = container_of(kref, struct drbd_conf, kref);
struct drbd_tconn *tconn = mdev->tconn;

- idr_remove(&mdev->tconn->volumes, mdev->vnr);
- idr_remove(&minors, mdev_to_minor(mdev));
- synchronize_rcu();
-
/* paranoia asserts */
D_ASSERT(mdev->open_cnt == 0);
D_ASSERT(list_empty(&mdev->tconn->data.work.q));
/* end paranoia asserts */

- del_gendisk(mdev->vdisk);
-
/* cleanup stuff that may have been allocated during
* device (re-)configuration or state changes */

@@ -2320,6 +2314,7 @@ static void drbd_cleanup(void)
{
unsigned int i;
struct drbd_conf *mdev;
+ struct drbd_tconn *tconn, *tmp;

unregister_reboot_notifier(&drbd_notifier);

@@ -2337,8 +2332,19 @@ static void drbd_cleanup(void)
drbd_genl_unregister();

down_write(&drbd_cfg_rwsem);
- idr_for_each_entry(&minors, mdev, i)
- drbd_delete_device(mdev);
+ idr_for_each_entry(&minors, mdev, i) {
+ idr_remove(&minors, mdev_to_minor(mdev));
+ idr_remove(&mdev->tconn->volumes, mdev->vnr);
+ del_gendisk(mdev->vdisk);
+ synchronize_rcu();
+ kref_put(&mdev->kref, &drbd_minor_destroy);
+ }
+
+ list_for_each_entry_safe(tconn, tmp, &drbd_tconns, all_tconn) {
+ list_del(&tconn->all_tconn);
+ synchronize_rcu();
+ kref_put(&tconn->kref, &conn_destroy);
+ }
up_write(&drbd_cfg_rwsem);

drbd_destroy_mempools();
@@ -2625,6 +2631,7 @@ enum drbd_ret_code conn_new_minor(struct drbd_tconn *tconn, unsigned int minor,
goto out_idr_remove_vol;
}
add_disk(disk);
+ kref_init(&mdev->kref); /* one ref for both idrs and the the add_disk */

/* inherit the connection state */
mdev->state.conn = tconn->cstate;
diff --git a/drivers/block/drbd/drbd_nl.c b/drivers/block/drbd/drbd_nl.c
index ce5d519..3c55be5 100644
--- a/drivers/block/drbd/drbd_nl.c
+++ b/drivers/block/drbd/drbd_nl.c
@@ -1087,7 +1087,7 @@ static void conn_reconfig_done(struct drbd_tconn *tconn)
spin_unlock_irq(&tconn->req_lock);
if (stop_threads) {
/* asender is implicitly stopped by receiver
- * in drbd_disconnect() */
+ * in conn_disconnect() */
drbd_thread_stop(&tconn->receiver);
drbd_thread_stop(&tconn->worker);
}
@@ -3079,7 +3079,11 @@ static enum drbd_ret_code adm_delete_minor(struct drbd_conf *mdev)
* we may want to delete a minor from a live replication group.
*/
mdev->state.role == R_SECONDARY) {
- drbd_delete_device(mdev);
+ idr_remove(&mdev->tconn->volumes, mdev->vnr);
+ idr_remove(&minors, mdev_to_minor(mdev));
+ del_gendisk(mdev->vdisk);
+ synchronize_rcu();
+ kref_put(&mdev->kref, &drbd_minor_destroy);
return NO_ERROR;
} else
return ERR_MINOR_CONFIGURED;
diff --git a/drivers/block/drbd/drbd_receiver.c b/drivers/block/drbd/drbd_receiver.c
index b4858bb..7156e53 100644
--- a/drivers/block/drbd/drbd_receiver.c
+++ b/drivers/block/drbd/drbd_receiver.c
@@ -844,7 +844,7 @@ int drbd_connected(int vnr, void *p, void *data)
* no point in trying again, please go standalone.
* -2 We do not have a network config...
*/
-static int drbd_connect(struct drbd_tconn *tconn)
+static int conn_connect(struct drbd_tconn *tconn)
{
struct socket *sock, *msock;
struct net_conf *nc;
@@ -878,7 +878,7 @@ static int drbd_connect(struct drbd_tconn *tconn)
tconn->meta.socket = s;
send_first_packet(tconn, &tconn->meta, P_INITIAL_META);
} else {
- conn_err(tconn, "Logic error in drbd_connect()\n");
+ conn_err(tconn, "Logic error in conn_connect()\n");
goto out_release_sockets;
}
}
@@ -4240,7 +4240,7 @@ void conn_flush_workqueue(struct drbd_tconn *tconn)
wait_for_completion(&barr.done);
}

-static void drbd_disconnect(struct drbd_tconn *tconn)
+static void conn_disconnect(struct drbd_tconn *tconn)
{
enum drbd_conns oc;
int rv = SS_UNKNOWN_ERROR;
@@ -4636,9 +4636,9 @@ int drbdd_init(struct drbd_thread *thi)
conn_info(tconn, "receiver (re)started\n");

do {
- h = drbd_connect(tconn);
+ h = conn_connect(tconn);
if (h == 0) {
- drbd_disconnect(tconn);
+ conn_disconnect(tconn);
schedule_timeout_interruptible(HZ);
}
if (h == -1) {
@@ -4650,7 +4650,7 @@ int drbdd_init(struct drbd_thread *thi)
if (h > 0)
drbdd(tconn);

- drbd_disconnect(tconn);
+ conn_disconnect(tconn);

conn_info(tconn, "receiver terminated\n");
return 0;
--
1.7.4.1


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