[dm-devel] [PATCH v2 14/20] multipath -u: add DM_MULTIPATH_DEVICE_PATH=2 for "maybe"

[Benjamin Marzinski]

On Mon, Mar 19, 2018 at 04:01:49PM +0100, Martin Wilck wrote:
> Use DM_MULTIPATH_DEVICE_PATH="2" to indicate that this might be a
> valid path, but we aren't certain. This happens with find_multipaths
> "smart", when the first path to a device (or a single-path
> device) is encountered, and the device is neither blacklisted,
> nor marked failed, nor whitelisted in the wwids file.
>
Reviewed-by: Benjamin Marzinski <bmarzins at redhat.com>
> Signed-off-by: Martin Wilck <mwilck at suse.com>
> ---
>  multipath/main.c | 12 ++++++++----
>  1 file changed, 8 insertions(+), 4 deletions(-)
> 
> diff --git a/multipath/main.c b/multipath/main.c
> index f93cad2abde0..9b53c13b3a78 100644
> --- a/multipath/main.c
> +++ b/multipath/main.c
> @@ -350,14 +350,15 @@ out:
>  	return r;
>  }
>  
> -static void print_cmd_valid(int k)
> +static int print_cmd_valid(int k)
>  {
> -	int vals[] = { 1, 0 };
> +	int vals[] = { 1, 0, 2 };
>  
>  	if (k < 0 || k >= sizeof(vals))
> -		return;
> +		return 1;
>  
>  	printf("DM_MULTIPATH_DEVICE_PATH=\"%d\"\n", vals[k]);
> +	return k == 1;
>  }
>  
>  /*
> @@ -501,6 +502,9 @@ configure (struct config *conf, enum mpath_cmds cmd,
>  		 * the refwwid, then the path is valid */
>  		if (VECTOR_SIZE(curmp) != 0 || VECTOR_SIZE(pathvec) > 1)
>  			r = 0;
> +		else
> +			/* Use r=2 as an indication for "maybe" */
> +			r = 2;
>  		goto print_valid;
>  	}
>  
> @@ -519,7 +523,7 @@ configure (struct config *conf, enum mpath_cmds cmd,
>  
>  print_valid:
>  	if (cmd == CMD_VALID_PATH)
> -		print_cmd_valid(r);
> +		r = print_cmd_valid(r);
>  
>  out:
>  	if (refwwid)
> -- 
> 2.16.1