Re: [dm-devel] [patch]: [multipath-tool] Add check for removed device in rdac checker

[Konrad Rzeszutek <konrad virtualiron com>]

On Mon, Oct 27, 2008 at 10:11:28AM -0500, Yanqing_Liu Dell com wrote:
> Hi,
> 
> This patch adds a check for removed device in rdac checker. After volume
> access inquiry returns, the checker will check the peripheral qualifier
> field to see if the device is deleted/unmapped. If so, mark path as
> failed.

How does multipathd behaves when this fix is not in? Does
it still mark the path down? I would presume so, but it would take
longer (the default SCSI timeout value?)

> 
> Signed off by: Yanqing Liu <Yanqing_Liu Dell com>
> 
> ---
> 
> --- libcheckers/rdac.c.orig	2008-10-22 02:52:33.000000000 -0400
> +++ libcheckers/rdac.c	2008-10-17 03:43:13.000000000 -0400
> @@ -27,6 +27,7 @@
>  #define MSG_RDAC_UP    "rdac checker reports path is up"
>  #define MSG_RDAC_DOWN  "rdac checker reports path is down"
>  #define MSG_RDAC_GHOST "rdac checker reports path is ghost"
> +#define MSG_RDAC_DELETED "rdac checker reports path deleted"
>  
>  struct rdac_checker_context {
>  	void * dummy;
> @@ -90,7 +91,8 @@
>  
>  struct volume_access_inq
>  {
> -	char dontcare0[8];
> +	char qualifier;
> +	char dontcare0[7];
>  	char avtcvp;
>  	char dontcare1[39];
>  };
> @@ -104,6 +106,12 @@
>  		MSG(c, MSG_RDAC_DOWN);
>  		return PATH_DOWN;
>  	}
> +	
> +	if (0 != inq.qualifier) {
> +		MSG(c, MSG_RDAC_DELETED);
> +		return PATH_DOWN;
> +	}
> +		
>  
>  	return ((inq.avtcvp & 0x1) ? PATH_UP : PATH_GHOST);  }
> 
> 
> 
> 
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