rbd: retry watch re-registration periodically
Revamp watch code to support retrying watch re-registration: - add rbd_dev->watch_state for more robust errcb handling - store watch cookie separately to avoid dereferencing watch_handle which is set to NULL on unwatch - move re-register code into a delayed work and retry re-registration every second, unless the client is blacklisted Signed-off-by: Ilya Dryomov <idryomov@gmail.com> Reviewed-by: Mike Christie <mchristi@redhat.com> Tested-by: Mike Christie <mchristi@redhat.com>steinar/wifi_calib_4_9_kernel
Ilya Dryomov
parent
1643dfa4c2
commit
99d1694310
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@ -114,6 +114,8 @@ static int atomic_dec_return_safe(atomic_t *v)
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#define RBD_OBJ_PREFIX_LEN_MAX 64
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#define RBD_RETRY_DELAY msecs_to_jiffies(1000)
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/* Feature bits */
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#define RBD_FEATURE_LAYERING (1<<0)
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@ -319,6 +321,12 @@ struct rbd_img_request {
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#define for_each_obj_request_safe(ireq, oreq, n) \
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list_for_each_entry_safe_reverse(oreq, n, &(ireq)->obj_requests, links)
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enum rbd_watch_state {
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RBD_WATCH_STATE_UNREGISTERED,
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RBD_WATCH_STATE_REGISTERED,
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RBD_WATCH_STATE_ERROR,
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};
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struct rbd_mapping {
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u64 size;
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u64 features;
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@ -352,7 +360,11 @@ struct rbd_device {
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struct ceph_file_layout layout; /* used for all rbd requests */
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struct mutex watch_mutex;
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enum rbd_watch_state watch_state;
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struct ceph_osd_linger_request *watch_handle;
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u64 watch_cookie;
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struct delayed_work watch_dwork;
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struct workqueue_struct *task_wq;
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@ -3083,9 +3095,6 @@ out_err:
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obj_request_done_set(obj_request);
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}
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static int rbd_dev_header_watch_sync(struct rbd_device *rbd_dev);
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static void __rbd_dev_header_unwatch_sync(struct rbd_device *rbd_dev);
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static void rbd_watch_cb(void *arg, u64 notify_id, u64 cookie,
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u64 notifier_id, void *data, size_t data_len)
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{
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@ -3113,35 +3122,34 @@ static void rbd_watch_cb(void *arg, u64 notify_id, u64 cookie,
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rbd_warn(rbd_dev, "notify_ack ret %d", ret);
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}
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static void __rbd_unregister_watch(struct rbd_device *rbd_dev);
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static void rbd_watch_errcb(void *arg, u64 cookie, int err)
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{
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struct rbd_device *rbd_dev = arg;
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int ret;
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rbd_warn(rbd_dev, "encountered watch error: %d", err);
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__rbd_dev_header_unwatch_sync(rbd_dev);
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mutex_lock(&rbd_dev->watch_mutex);
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if (rbd_dev->watch_state == RBD_WATCH_STATE_REGISTERED) {
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__rbd_unregister_watch(rbd_dev);
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rbd_dev->watch_state = RBD_WATCH_STATE_ERROR;
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ret = rbd_dev_header_watch_sync(rbd_dev);
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if (ret) {
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rbd_warn(rbd_dev, "failed to reregister watch: %d", ret);
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return;
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queue_delayed_work(rbd_dev->task_wq, &rbd_dev->watch_dwork, 0);
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}
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ret = rbd_dev_refresh(rbd_dev);
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if (ret)
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rbd_warn(rbd_dev, "reregisteration refresh failed: %d", ret);
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mutex_unlock(&rbd_dev->watch_mutex);
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}
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/*
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* Initiate a watch request, synchronously.
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* watch_mutex must be locked
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*/
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static int rbd_dev_header_watch_sync(struct rbd_device *rbd_dev)
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static int __rbd_register_watch(struct rbd_device *rbd_dev)
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{
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struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc;
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struct ceph_osd_linger_request *handle;
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rbd_assert(!rbd_dev->watch_handle);
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dout("%s rbd_dev %p\n", __func__, rbd_dev);
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handle = ceph_osdc_watch(osdc, &rbd_dev->header_oid,
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&rbd_dev->header_oloc, rbd_watch_cb,
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@ -3153,13 +3161,16 @@ static int rbd_dev_header_watch_sync(struct rbd_device *rbd_dev)
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return 0;
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}
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static void __rbd_dev_header_unwatch_sync(struct rbd_device *rbd_dev)
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/*
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* watch_mutex must be locked
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*/
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static void __rbd_unregister_watch(struct rbd_device *rbd_dev)
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{
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struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc;
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int ret;
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if (!rbd_dev->watch_handle)
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return;
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rbd_assert(rbd_dev->watch_handle);
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dout("%s rbd_dev %p\n", __func__, rbd_dev);
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ret = ceph_osdc_unwatch(osdc, rbd_dev->watch_handle);
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if (ret)
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@ -3168,17 +3179,80 @@ static void __rbd_dev_header_unwatch_sync(struct rbd_device *rbd_dev)
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rbd_dev->watch_handle = NULL;
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}
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/*
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* Tear down a watch request, synchronously.
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*/
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static void rbd_dev_header_unwatch_sync(struct rbd_device *rbd_dev)
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static int rbd_register_watch(struct rbd_device *rbd_dev)
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{
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__rbd_dev_header_unwatch_sync(rbd_dev);
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int ret;
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mutex_lock(&rbd_dev->watch_mutex);
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rbd_assert(rbd_dev->watch_state == RBD_WATCH_STATE_UNREGISTERED);
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ret = __rbd_register_watch(rbd_dev);
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if (ret)
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goto out;
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rbd_dev->watch_state = RBD_WATCH_STATE_REGISTERED;
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rbd_dev->watch_cookie = rbd_dev->watch_handle->linger_id;
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out:
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mutex_unlock(&rbd_dev->watch_mutex);
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return ret;
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}
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static void cancel_tasks_sync(struct rbd_device *rbd_dev)
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{
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dout("%s rbd_dev %p\n", __func__, rbd_dev);
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cancel_delayed_work_sync(&rbd_dev->watch_dwork);
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}
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static void rbd_unregister_watch(struct rbd_device *rbd_dev)
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{
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cancel_tasks_sync(rbd_dev);
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mutex_lock(&rbd_dev->watch_mutex);
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if (rbd_dev->watch_state == RBD_WATCH_STATE_REGISTERED)
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__rbd_unregister_watch(rbd_dev);
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rbd_dev->watch_state = RBD_WATCH_STATE_UNREGISTERED;
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mutex_unlock(&rbd_dev->watch_mutex);
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dout("%s flushing notifies\n", __func__);
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ceph_osdc_flush_notifies(&rbd_dev->rbd_client->client->osdc);
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}
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static void rbd_reregister_watch(struct work_struct *work)
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{
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struct rbd_device *rbd_dev = container_of(to_delayed_work(work),
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struct rbd_device, watch_dwork);
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int ret;
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dout("%s rbd_dev %p\n", __func__, rbd_dev);
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mutex_lock(&rbd_dev->watch_mutex);
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if (rbd_dev->watch_state != RBD_WATCH_STATE_ERROR)
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goto fail_unlock;
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ret = __rbd_register_watch(rbd_dev);
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if (ret) {
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rbd_warn(rbd_dev, "failed to reregister watch: %d", ret);
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if (ret != -EBLACKLISTED)
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queue_delayed_work(rbd_dev->task_wq,
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&rbd_dev->watch_dwork,
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RBD_RETRY_DELAY);
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goto fail_unlock;
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}
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rbd_dev->watch_state = RBD_WATCH_STATE_REGISTERED;
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rbd_dev->watch_cookie = rbd_dev->watch_handle->linger_id;
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mutex_unlock(&rbd_dev->watch_mutex);
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ret = rbd_dev_refresh(rbd_dev);
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if (ret)
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rbd_warn(rbd_dev, "reregisteration refresh failed: %d", ret);
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return;
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fail_unlock:
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mutex_unlock(&rbd_dev->watch_mutex);
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}
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/*
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* Synchronous osd object method call. Returns the number of bytes
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* returned in the outbound buffer, or a negative error code.
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@ -3945,6 +4019,8 @@ static void rbd_spec_free(struct kref *kref)
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static void rbd_dev_free(struct rbd_device *rbd_dev)
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{
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WARN_ON(rbd_dev->watch_state != RBD_WATCH_STATE_UNREGISTERED);
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ceph_oid_destroy(&rbd_dev->header_oid);
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ceph_oloc_destroy(&rbd_dev->header_oloc);
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@ -3991,6 +4067,10 @@ static struct rbd_device *__rbd_dev_create(struct rbd_client *rbdc,
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ceph_oid_init(&rbd_dev->header_oid);
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ceph_oloc_init(&rbd_dev->header_oloc);
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mutex_init(&rbd_dev->watch_mutex);
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rbd_dev->watch_state = RBD_WATCH_STATE_UNREGISTERED;
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INIT_DELAYED_WORK(&rbd_dev->watch_dwork, rbd_reregister_watch);
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rbd_dev->dev.bus = &rbd_bus_type;
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rbd_dev->dev.type = &rbd_device_type;
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rbd_dev->dev.parent = &rbd_root_dev;
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@ -5222,7 +5302,7 @@ static int rbd_dev_image_probe(struct rbd_device *rbd_dev, int depth)
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goto err_out_format;
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if (!depth) {
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ret = rbd_dev_header_watch_sync(rbd_dev);
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ret = rbd_register_watch(rbd_dev);
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if (ret) {
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if (ret == -ENOENT)
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pr_info("image %s/%s does not exist\n",
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@ -5281,7 +5361,7 @@ err_out_probe:
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rbd_dev_unprobe(rbd_dev);
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err_out_watch:
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if (!depth)
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rbd_dev_header_unwatch_sync(rbd_dev);
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rbd_unregister_watch(rbd_dev);
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err_out_format:
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rbd_dev->image_format = 0;
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kfree(rbd_dev->spec->image_id);
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@ -5348,11 +5428,11 @@ static ssize_t do_rbd_add(struct bus_type *bus,
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rc = rbd_dev_device_setup(rbd_dev);
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if (rc) {
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/*
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* rbd_dev_header_unwatch_sync() can't be moved into
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* rbd_unregister_watch() can't be moved into
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* rbd_dev_image_release() without refactoring, see
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* commit 1f3ef78861ac.
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*/
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rbd_dev_header_unwatch_sync(rbd_dev);
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rbd_unregister_watch(rbd_dev);
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rbd_dev_image_release(rbd_dev);
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goto out;
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}
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@ -5473,7 +5553,7 @@ static ssize_t do_rbd_remove(struct bus_type *bus,
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if (ret < 0 || already)
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return ret;
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rbd_dev_header_unwatch_sync(rbd_dev);
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rbd_unregister_watch(rbd_dev);
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/*
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* Don't free anything from rbd_dev->disk until after all
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@ -4014,6 +4014,7 @@ EXPORT_SYMBOL(ceph_osdc_list_watchers);
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*/
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void ceph_osdc_flush_notifies(struct ceph_osd_client *osdc)
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{
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dout("%s osdc %p\n", __func__, osdc);
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flush_workqueue(osdc->notify_wq);
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}
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EXPORT_SYMBOL(ceph_osdc_flush_notifies);
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