[Ocfs2-devel] [PATCH 2/6] ocfs2: o2hb: add NEGO_TIMEOUT message

[Eric Ren <zren@suse.com>]

On Wed, Jan 20, 2016 at 11:13:35AM +0800, Junxiao Bi wrote: 
> This message is sent to master node when non-master nodes's
> negotiate timer expired. Master node records these nodes in
> a bitmap which is used to do write timeout timer re-queue
> decision.
> 
> Signed-off-by: Junxiao Bi <junxiao.bi@oracle.com>
> Reviewed-by: Ryan Ding <ryan.ding@oracle.com>
> ---
>  fs/ocfs2/cluster/heartbeat.c |   66 +++++++++++++++++++++++++++++++++++++++++-
>  1 file changed, 65 insertions(+), 1 deletion(-)
> 
> diff --git a/fs/ocfs2/cluster/heartbeat.c b/fs/ocfs2/cluster/heartbeat.c
> index b601ee95de50..ecf8a5e21c38 100644
> --- a/fs/ocfs2/cluster/heartbeat.c
> +++ b/fs/ocfs2/cluster/heartbeat.c
> @@ -280,6 +280,10 @@ struct o2hb_region {
>  	 * being checked because we temporarily have to zero out the
>  	 * crc field. */
>  	struct o2hb_disk_heartbeat_block *hr_tmp_block;
> +
> +	/* Message key for negotiate timeout message. */
> +	unsigned int		hr_key;
> +	struct list_head	hr_handler_list;
>  };
>  
>  struct o2hb_bio_wait_ctxt {
> @@ -288,6 +292,14 @@ struct o2hb_bio_wait_ctxt {
>  	int               wc_error;
>  };
>  
> +enum {
> +	O2HB_NEGO_TIMEOUT_MSG = 1,
> +};
> +
> +struct o2hb_nego_msg {
> +	u8 node_num;
> +};
> +
>  static void o2hb_write_timeout(struct work_struct *work)
>  {
>  	int failed, quorum;
> @@ -356,6 +368,24 @@ static void o2hb_disarm_timeout(struct o2hb_region *reg)
>  	cancel_delayed_work_sync(&reg->hr_nego_timeout_work);
>  }
>  
> +static int o2hb_send_nego_msg(int key, int type, u8 target)
> +{
> +	struct o2hb_nego_msg msg;
> +	int status, ret;
> +
> +	msg.node_num = o2nm_this_node();
> +again:
> +	ret = o2net_send_message(type, key, &msg, sizeof(msg),
> +			target, &status);
> +
> +	if (ret == -EAGAIN || ret == -ENOMEM) {
> +		msleep(100);
> +		goto again;
> +	}
> +
> +	return ret;
> +}
> +
>  static void o2hb_nego_timeout(struct work_struct *work)
>  {
>  	struct o2hb_region *reg =
> @@ -384,8 +414,24 @@ static void o2hb_nego_timeout(struct work_struct *work)
>  		/* approve negotiate timeout request. */
>  	} else {
>  		/* negotiate timeout with master node. */
> +		o2hb_send_nego_msg(reg->hr_key, O2HB_NEGO_TIMEOUT_MSG,
> +			master_node);
>  	}
> +}
> +
> +static int o2hb_nego_timeout_handler(struct o2net_msg *msg, u32 len, void *data,
> +				void **ret_data)
> +{
> +	struct o2hb_region *reg = (struct o2hb_region *)data;
> +	struct o2hb_nego_msg *nego_msg;
>  
> +	nego_msg = (struct o2hb_nego_msg *)msg->buf;
> +	if (nego_msg->node_num < O2NM_MAX_NODES)
> +		set_bit(nego_msg->node_num, reg->hr_nego_node_bitmap);
> +	else
> +		mlog(ML_ERROR, "got nego timeout message from bad node.\n");
> +
> +	return 0;
>  }
>  
>  static inline void o2hb_bio_wait_init(struct o2hb_bio_wait_ctxt *wc)
> @@ -1493,6 +1539,7 @@ static void o2hb_region_release(struct config_item *item)
>  	list_del(&reg->hr_all_item);
>  	spin_unlock(&o2hb_live_lock);
>  
> +	o2net_unregister_handler_list(&reg->hr_handler_list);
>  	kfree(reg);
>  }
>  
> @@ -2039,13 +2086,30 @@ static struct config_item *o2hb_heartbeat_group_make_item(struct config_group *g
>  
>  	config_item_init_type_name(&reg->hr_item, name, &o2hb_region_type);
>  
> +	/* this is the same way to generate msg key as dlm, for local heartbeat,
> +	 * name is also the same, so make initial crc value different to avoid
> +	 * message key conflict.
> +	 */
> +	reg->hr_key = crc32_le(reg->hr_region_num + O2NM_MAX_REGIONS,
> +		name, strlen(name));
> +	INIT_LIST_HEAD(&reg->hr_handler_list);

Looks no need to initilize ->hr_handler_list here?

Thanks,
Eric
> +	ret = o2net_register_handler(O2HB_NEGO_TIMEOUT_MSG, reg->hr_key,
> +			sizeof(struct o2hb_nego_msg),
> +			o2hb_nego_timeout_handler,
> +			reg, NULL, &reg->hr_handler_list);
> +	if (ret)
> +		goto free;
> +
>  	ret = o2hb_debug_region_init(reg, o2hb_debug_dir);
>  	if (ret) {
>  		config_item_put(&reg->hr_item);
> -		goto free;
> +		goto free_handler;
>  	}
>  
>  	return &reg->hr_item;
> +
> +free_handler:
> +	o2net_unregister_handler_list(&reg->hr_handler_list);
>  free:
>  	kfree(reg);
>  	return ERR_PTR(ret);
> -- 
> 1.7.9.5
> 
> 
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