mirror of https://gitee.com/openkylin/linux.git
drbd: Basic refcounting for drbd_tconn
References hold by: * Each (running) drbd thread has a reference on tconn * Each mdev has a referenc on tconn * Beeing in the all_tconn list counts for one reference * Each after_conn_state_chg_work has a reference to tconn Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
This commit is contained in:
Philipp Reisner
parent
1d04122599
commit
9dc9fbb357
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@ -828,6 +828,7 @@ enum {
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struct drbd_tconn { /* is a resource from the config file */
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char *name; /* Resource name */
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struct list_head all_tconn; /* linked on global drbd_tconns */
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struct kref kref;
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struct idr volumes; /* <tconn, vnr> to mdev mapping */
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enum drbd_conns cstate; /* Only C_STANDALONE to C_WF_REPORT_PARAMS */
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unsigned susp:1; /* IO suspended by user */
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@ -1378,8 +1379,8 @@ 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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struct drbd_tconn *drbd_new_tconn(const char *name);
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extern void drbd_free_tconn(struct drbd_tconn *tconn);
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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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struct drbd_tconn *conn_by_name(const char *name);
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extern void conn_free_crypto(struct drbd_tconn *tconn);
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@ -509,6 +509,8 @@ static int drbd_thread_setup(void *arg)
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conn_info(tconn, "Terminating %s\n", current->comm);
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/* Release mod reference taken when thread was started */
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kref_put(&tconn->kref, &conn_destroy);
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module_put(THIS_MODULE);
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return retval;
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}
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@ -546,6 +548,8 @@ int drbd_thread_start(struct drbd_thread *thi)
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return false;
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}
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kref_get(&thi->tconn->kref);
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init_completion(&thi->stop);
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thi->reset_cpu_mask = 1;
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thi->t_state = RUNNING;
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@ -558,6 +562,7 @@ int drbd_thread_start(struct drbd_thread *thi)
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if (IS_ERR(nt)) {
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conn_err(tconn, "Couldn't start thread\n");
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kref_put(&tconn->kref, &conn_destroy);
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module_put(THIS_MODULE);
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return false;
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}
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@ -2237,6 +2242,8 @@ static void drbd_release_all_peer_reqs(struct drbd_conf *mdev)
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/* caution. no locking. */
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void drbd_delete_device(struct drbd_conf *mdev)
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{
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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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@ -2272,6 +2279,8 @@ void drbd_delete_device(struct drbd_conf *mdev)
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put_disk(mdev->vdisk);
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blk_cleanup_queue(mdev->rq_queue);
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kfree(mdev);
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kref_put(&tconn->kref, &conn_destroy);
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}
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static void drbd_cleanup(void)
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@ -2409,7 +2418,7 @@ void conn_free_crypto(struct drbd_tconn *tconn)
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tconn->int_dig_vv = NULL;
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}
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struct drbd_tconn *drbd_new_tconn(const char *name)
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struct drbd_tconn *conn_create(const char *name)
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{
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struct drbd_tconn *tconn;
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@ -2455,6 +2464,7 @@ struct drbd_tconn *drbd_new_tconn(const char *name)
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};
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down_write(&drbd_cfg_rwsem);
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kref_init(&tconn->kref);
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list_add_tail(&tconn->all_tconn, &drbd_tconns);
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up_write(&drbd_cfg_rwsem);
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@ -2471,9 +2481,10 @@ struct drbd_tconn *drbd_new_tconn(const char *name)
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return NULL;
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}
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void drbd_free_tconn(struct drbd_tconn *tconn)
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void conn_destroy(struct kref *kref)
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{
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list_del(&tconn->all_tconn);
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struct drbd_tconn *tconn = container_of(kref, struct drbd_tconn, kref);
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idr_destroy(&tconn->volumes);
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free_cpumask_var(tconn->cpu_mask);
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@ -2503,7 +2514,9 @@ enum drbd_ret_code conn_new_minor(struct drbd_tconn *tconn, unsigned int minor,
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if (!mdev)
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return ERR_NOMEM;
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kref_get(&tconn->kref);
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mdev->tconn = tconn;
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mdev->minor = minor;
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mdev->vnr = vnr;
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@ -2605,6 +2618,7 @@ enum drbd_ret_code conn_new_minor(struct drbd_tconn *tconn, unsigned int minor,
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blk_cleanup_queue(q);
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out_no_q:
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kfree(mdev);
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kref_put(&tconn->kref, &conn_destroy);
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return err;
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}
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@ -479,6 +479,7 @@ static int _try_outdate_peer_async(void *data)
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conn_try_outdate_peer(tconn);
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kref_put(&tconn->kref, &conn_destroy);
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return 0;
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}
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@ -486,9 +487,12 @@ void conn_try_outdate_peer_async(struct drbd_tconn *tconn)
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{
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struct task_struct *opa;
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kref_get(&tconn->kref);
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opa = kthread_run(_try_outdate_peer_async, tconn, "drbd_async_h");
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if (IS_ERR(opa))
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if (IS_ERR(opa)) {
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conn_err(tconn, "out of mem, failed to invoke fence-peer helper\n");
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kref_put(&tconn->kref, &conn_destroy);
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}
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}
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enum drbd_state_rv
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@ -2627,7 +2631,7 @@ int get_one_status(struct sk_buff *skb, struct netlink_callback *cb)
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* on each iteration.
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*/
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/* synchronize with drbd_new_tconn/drbd_free_tconn */
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/* synchronize with conn_create()/conn_destroy() */
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down_read(&drbd_cfg_rwsem);
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/* revalidate iterator position */
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list_for_each_entry(tmp, &drbd_tconns, all_tconn) {
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@ -2932,7 +2936,7 @@ int drbd_adm_create_connection(struct sk_buff *skb, struct genl_info *info)
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goto out;
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}
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if (!drbd_new_tconn(adm_ctx.conn_name))
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if (!conn_create(adm_ctx.conn_name))
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retcode = ERR_NOMEM;
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out:
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drbd_adm_finish(info, retcode);
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@ -3005,10 +3009,6 @@ int drbd_adm_delete_minor(struct sk_buff *skb, struct genl_info *info)
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down_write(&drbd_cfg_rwsem);
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retcode = adm_delete_minor(adm_ctx.mdev);
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up_write(&drbd_cfg_rwsem);
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/* if this was the last volume of this connection,
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* this will terminate all threads */
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if (retcode == NO_ERROR)
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conn_reconfig_done(adm_ctx.tconn);
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out:
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drbd_adm_finish(info, retcode);
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return 0;
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@ -3078,7 +3078,9 @@ int drbd_adm_down(struct sk_buff *skb, struct genl_info *info)
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/* delete connection */
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if (conn_lowest_minor(adm_ctx.tconn) < 0) {
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drbd_free_tconn(adm_ctx.tconn);
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list_del(&adm_ctx.tconn->all_tconn);
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kref_put(&adm_ctx.tconn->kref, &conn_destroy);
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retcode = NO_ERROR;
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} else {
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/* "can not happen" */
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@ -3107,7 +3109,9 @@ int drbd_adm_delete_connection(struct sk_buff *skb, struct genl_info *info)
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down_write(&drbd_cfg_rwsem);
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if (conn_lowest_minor(adm_ctx.tconn) < 0) {
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drbd_free_tconn(adm_ctx.tconn);
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list_del(&adm_ctx.tconn->all_tconn);
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kref_put(&adm_ctx.tconn->kref, &conn_destroy);
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retcode = NO_ERROR;
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} else {
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retcode = ERR_CONN_IN_USE;
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@ -1460,6 +1460,7 @@ static int w_after_conn_state_ch(struct drbd_work *w, int unused)
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//conn_err(tconn, STATE_FMT, STATE_ARGS("nms", nms));
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after_all_state_ch(tconn);
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kref_put(&tconn->kref, &conn_destroy);
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return 0;
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}
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@ -1686,6 +1687,7 @@ _conn_request_state(struct drbd_tconn *tconn, union drbd_state mask, union drbd_
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acscw->ns_max = ns_max;
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acscw->flags = flags;
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acscw->w.cb = w_after_conn_state_ch;
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kref_get(&tconn->kref);
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acscw->w.tconn = tconn;
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drbd_queue_work(&tconn->data.work, &acscw->w);
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} else {
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