[sheepdog] [PATCH v1] sheep/md: fix dog cluster info command show wrong disk number

[Hitoshi Mitake]

At Wed, 10 Sep 2014 20:08:32 +0800,
Bingpeng Zhu wrote:
> 
> If we enable diskvnodes mode and encounter EIO, running dog
> cluster info will show wrong disk number in the new epoch.
> We should update node disks when handling EIO and unplug the
> disk.
> 
> Signed-off-by: Bingpeng Zhu <bingpeng.zbp at alibaba-inc.com>
> ---
>  sheep/md.c |    3 +++
>  1 files changed, 3 insertions(+), 0 deletions(-)
> 
> diff --git a/sheep/md.c b/sheep/md.c
> index b13d30a..378d1f1 100644
> --- a/sheep/md.c
> +++ b/sheep/md.c
> @@ -541,6 +541,9 @@ static void md_do_recover(struct work *work)
>  out:
>  	sd_rw_unlock(&md.lock);
>  
> +	if (disk)
> +		update_node_disks();
> +

The change looks reasonable. But I have a question:

>  	if (nr > 0)
>  		kick_recover();

Does the above conditional branch (nr > 0) required? When a node has
single disk and faces EIO, md.nr_disks can change from 1 to 0. In such
a case, the code will not call kick_recover(). I think it is a
problematic behavior. How do you think?

Thanks,
Hitoshi

>  
> -- 
> 1.7.1
> 
> 
> 
> 
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