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drbd: Refcounting for mdev objects
Preparing removal of drbd_cfg_rwsem Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
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@ -867,6 +867,7 @@ struct drbd_tconn { /* is a resource from the config file */
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struct drbd_conf {
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struct drbd_tconn *tconn;
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int vnr; /* volume number within the connection */
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struct kref kref;
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/* things that are stored as / read from meta data on disk */
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unsigned long flags;
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@ -1373,7 +1374,7 @@ extern rwlock_t global_state_lock;
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extern int conn_lowest_minor(struct drbd_tconn *tconn);
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enum drbd_ret_code conn_new_minor(struct drbd_tconn *tconn, unsigned int minor, int vnr);
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extern void drbd_delete_device(struct drbd_conf *mdev);
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extern void drbd_minor_destroy(struct kref *kref);
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struct drbd_tconn *conn_create(const char *name);
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extern void conn_destroy(struct kref *kref);
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@ -2052,7 +2052,6 @@ void drbd_init_set_defaults(struct drbd_conf *mdev)
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init_waitqueue_head(&mdev->al_wait);
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init_waitqueue_head(&mdev->seq_wait);
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/* mdev->tconn->agreed_pro_version gets initialized in drbd_connect() */
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mdev->write_ordering = WO_bdev_flush;
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mdev->resync_wenr = LC_FREE;
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mdev->peer_max_bio_size = DRBD_MAX_BIO_SIZE_SAFE;
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@ -2272,21 +2271,16 @@ static void drbd_release_all_peer_reqs(struct drbd_conf *mdev)
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}
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/* caution. no locking. */
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void drbd_delete_device(struct drbd_conf *mdev)
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void drbd_minor_destroy(struct kref *kref)
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{
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struct drbd_conf *mdev = container_of(kref, struct drbd_conf, kref);
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struct drbd_tconn *tconn = mdev->tconn;
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idr_remove(&mdev->tconn->volumes, mdev->vnr);
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idr_remove(&minors, mdev_to_minor(mdev));
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synchronize_rcu();
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/* paranoia asserts */
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D_ASSERT(mdev->open_cnt == 0);
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D_ASSERT(list_empty(&mdev->tconn->data.work.q));
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/* end paranoia asserts */
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del_gendisk(mdev->vdisk);
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/* cleanup stuff that may have been allocated during
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* device (re-)configuration or state changes */
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@ -2320,6 +2314,7 @@ static void drbd_cleanup(void)
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{
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unsigned int i;
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struct drbd_conf *mdev;
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struct drbd_tconn *tconn, *tmp;
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unregister_reboot_notifier(&drbd_notifier);
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@ -2337,8 +2332,19 @@ static void drbd_cleanup(void)
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drbd_genl_unregister();
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down_write(&drbd_cfg_rwsem);
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idr_for_each_entry(&minors, mdev, i)
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drbd_delete_device(mdev);
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idr_for_each_entry(&minors, mdev, i) {
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idr_remove(&minors, mdev_to_minor(mdev));
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idr_remove(&mdev->tconn->volumes, mdev->vnr);
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del_gendisk(mdev->vdisk);
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synchronize_rcu();
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kref_put(&mdev->kref, &drbd_minor_destroy);
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}
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list_for_each_entry_safe(tconn, tmp, &drbd_tconns, all_tconn) {
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list_del(&tconn->all_tconn);
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synchronize_rcu();
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kref_put(&tconn->kref, &conn_destroy);
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}
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up_write(&drbd_cfg_rwsem);
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drbd_destroy_mempools();
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@ -2625,6 +2631,7 @@ enum drbd_ret_code conn_new_minor(struct drbd_tconn *tconn, unsigned int minor,
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goto out_idr_remove_vol;
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}
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add_disk(disk);
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kref_init(&mdev->kref); /* one ref for both idrs and the the add_disk */
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/* inherit the connection state */
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mdev->state.conn = tconn->cstate;
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@ -1065,7 +1065,7 @@ static void conn_reconfig_done(struct drbd_tconn *tconn)
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spin_unlock_irq(&tconn->req_lock);
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if (stop_threads) {
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/* asender is implicitly stopped by receiver
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* in drbd_disconnect() */
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* in conn_disconnect() */
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drbd_thread_stop(&tconn->receiver);
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drbd_thread_stop(&tconn->worker);
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}
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@ -3033,7 +3033,11 @@ static enum drbd_ret_code adm_delete_minor(struct drbd_conf *mdev)
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* we may want to delete a minor from a live replication group.
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*/
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mdev->state.role == R_SECONDARY) {
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drbd_delete_device(mdev);
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idr_remove(&mdev->tconn->volumes, mdev->vnr);
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idr_remove(&minors, mdev_to_minor(mdev));
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del_gendisk(mdev->vdisk);
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synchronize_rcu();
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kref_put(&mdev->kref, &drbd_minor_destroy);
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return NO_ERROR;
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} else
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return ERR_MINOR_CONFIGURED;
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@ -844,7 +844,7 @@ int drbd_connected(int vnr, void *p, void *data)
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* no point in trying again, please go standalone.
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* -2 We do not have a network config...
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*/
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static int drbd_connect(struct drbd_tconn *tconn)
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static int conn_connect(struct drbd_tconn *tconn)
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{
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struct socket *sock, *msock;
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struct net_conf *nc;
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@ -878,7 +878,7 @@ static int drbd_connect(struct drbd_tconn *tconn)
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tconn->meta.socket = s;
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send_first_packet(tconn, &tconn->meta, P_INITIAL_META);
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} else {
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conn_err(tconn, "Logic error in drbd_connect()\n");
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conn_err(tconn, "Logic error in conn_connect()\n");
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goto out_release_sockets;
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}
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}
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@ -4240,7 +4240,7 @@ void conn_flush_workqueue(struct drbd_tconn *tconn)
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wait_for_completion(&barr.done);
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}
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static void drbd_disconnect(struct drbd_tconn *tconn)
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static void conn_disconnect(struct drbd_tconn *tconn)
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{
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enum drbd_conns oc;
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int rv = SS_UNKNOWN_ERROR;
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@ -4636,9 +4636,9 @@ int drbdd_init(struct drbd_thread *thi)
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conn_info(tconn, "receiver (re)started\n");
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do {
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h = drbd_connect(tconn);
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h = conn_connect(tconn);
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if (h == 0) {
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drbd_disconnect(tconn);
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conn_disconnect(tconn);
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schedule_timeout_interruptible(HZ);
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}
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if (h == -1) {
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@ -4650,7 +4650,7 @@ int drbdd_init(struct drbd_thread *thi)
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if (h > 0)
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drbdd(tconn);
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drbd_disconnect(tconn);
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conn_disconnect(tconn);
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conn_info(tconn, "receiver terminated\n");
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return 0;
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